git/revision.c

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#include "cache.h"
#include "tag.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "diff.h"
#include "refs.h"
#include "revision.h"
#include "graph.h"
#include "grep.h"
#include "reflog-walk.h"
#include "patch-ids.h"
#include "decorate.h"
#include "log-tree.h"
#include "string-list.h"
Implement line-history search (git log -L) This is a rewrite of much of Bo's work, mainly in an effort to split it into smaller, easier to understand routines. The algorithm is built around the struct range_set, which encodes a series of line ranges as intervals [a,b). This is used in two contexts: * A set of lines we are tracking (which will change as we dig through history). * To encode diffs, as pairs of ranges. The main routine is range_set_map_across_diff(). It processes the diff between a commit C and some parent P. It determines which diff hunks are relevant to the ranges tracked in C, and computes the new ranges for P. The algorithm is then simply to process history in topological order from newest to oldest, computing ranges and (partial) diffs. At branch points, we need to merge the ranges we are watching. We will find that many commits do not affect the chosen ranges, and mark them TREESAME (in addition to those already filtered by pathspec limiting). Another pass of history simplification then gets rid of such commits. This is wired as an extra filtering pass in the log machinery. This currently only reduces code duplication, but should allow for other simplifications and options to be used. Finally, we hook a diff printer into the output chain. Ideally we would wire directly into the diff logic, to optionally use features like word diff. However, that will require some major reworking of the diff chain, so we completely replace the output with our own diff for now. As this was a GSoC project, and has quite some history by now, many people have helped. In no particular order, thanks go to Jakub Narebski <jnareb@gmail.com> Jens Lehmann <Jens.Lehmann@web.de> Jonathan Nieder <jrnieder@gmail.com> Junio C Hamano <gitster@pobox.com> Ramsay Jones <ramsay@ramsay1.demon.co.uk> Will Palmer <wmpalmer@gmail.com> Apologies to everyone I forgot. Signed-off-by: Bo Yang <struggleyb.nku@gmail.com> Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-03-29 00:47:32 +08:00
#include "line-log.h"
#include "mailmap.h"
log: use true parents for diff even when rewriting When using pathspec filtering in combination with diff-based log output, parent simplification happens before the diff is computed. The diff is therefore against the *simplified* parents. This works okay, arguably by accident, in the normal case: simplification reduces to one parent as long as the commit is TREESAME to it. So the simplified parent of any given commit must have the same tree contents on the filtered paths as its true (unfiltered) parent. However, --full-diff breaks this guarantee, and indeed gives pretty spectacular results when comparing the output of git log --graph --stat ... git log --graph --full-diff --stat ... (--graph internally kicks in parent simplification, much like --parents). To fix it, store a copy of the parent list before simplification (in a slab) whenever --full-diff is in effect. Then use the stored parents instead of the simplified ones in the commit display code paths. The latter do not actually check for --full-diff to avoid duplicated code; they just grab the original parents if save_parents() has not been called for this revision walk. For ordinary commits it should be obvious that this is the right thing to do. Merge commits are a bit subtle. Observe that with default simplification, merge simplification is an all-or-nothing decision: either the merge is TREESAME to one parent and disappears, or it is different from all parents and the parent list remains intact. Redundant parents are not pruned, so the existing code also shows them as a merge. So if we do show a merge commit, the parent list just consists of the rewrite result on each parent. Running, e.g., --cc on this in --full-diff mode is not very useful: if any commits were skipped, some hunks will disagree with all sides of the merge (with one side, because commits were skipped; with the others, because they didn't have those changes in the first place). This triggers --cc showing these hunks spuriously. Therefore I believe that even for merge commits it is better to show the diffs wrt. the original parents. Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Helped-by: Junio C Hamano <gitster@pobox.com> Helped-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Thomas Rast <trast@inf.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-01 04:13:20 +08:00
#include "commit-slab.h"
#include "dir.h"
#include "cache-tree.h"
#include "bisect.h"
volatile show_early_output_fn_t show_early_output;
static const char *term_bad;
static const char *term_good;
void show_object_with_name(FILE *out, struct object *obj, const char *name)
{
const char *p;
fprintf(out, "%s ", oid_to_hex(&obj->oid));
for (p = name; *p && *p != '\n'; p++)
fputc(*p, out);
fputc('\n', out);
}
static void mark_blob_uninteresting(struct blob *blob)
{
if (!blob)
return;
if (blob->object.flags & UNINTERESTING)
return;
blob->object.flags |= UNINTERESTING;
}
revision: mark contents of an uninteresting tree uninteresting "git rev-list --objects ^A^{tree} B^{tree}" ought to mean "I want a list of objects inside B's tree, but please exclude the objects that appear inside A's tree". we see the top-level tree marked as uninteresting (i.e. ^A^{tree} in the above example) and call mark_tree_uninteresting() on it; this unfortunately prevents us from recursing into the tree and marking the objects in the tree as uninteresting. The reason why "git log ^A A" yields an empty set of commits, i.e. we do not have a similar issue for commits, is because we call mark_parents_uninteresting() after seeing an uninteresting commit. The uninteresting-ness of the commit itself does not prevent its parents from being marked as uninteresting. Introduce mark_tree_contents_uninteresting() and structure the code in handle_commit() in such a way that it makes it the responsibility of the callchain leading to this function to mark commits, trees and blobs as uninteresting, and also make it the responsibility of the helpers called from this function to mark objects that are reachable from them. Note that this is a very old bug that probably dates back to the day when "rev-list --objects" was introduced. The line to clear tree->object.parsed at the end of mark_tree_contents_uninteresting() can be removed when this fix is merged to the codebase after 6e454b9a (clear parsed flag when we free tree buffers, 2013-06-05). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-16 07:38:01 +08:00
static void mark_tree_contents_uninteresting(struct tree *tree)
{
struct tree_desc desc;
tree_entry(): new tree-walking helper function This adds a "tree_entry()" function that combines the common operation of doing a "tree_entry_extract()" + "update_tree_entry()". It also has a simplified calling convention, designed for simple loops that traverse over a whole tree: the arguments are pointers to the tree descriptor and a name_entry structure to fill in, and it returns a boolean "true" if there was an entry left to be gotten in the tree. This allows tree traversal with struct tree_desc desc; struct name_entry entry; desc.buf = tree->buffer; desc.size = tree->size; while (tree_entry(&desc, &entry) { ... use "entry.{path, sha1, mode, pathlen}" ... } which is not only shorter than writing it out in full, it's hopefully less error prone too. [ It's actually a tad faster too - we don't need to recalculate the entry pathlength in both extract and update, but need to do it only once. Also, some callers can avoid doing a "strlen()" on the result, since it's returned as part of the name_entry structure. However, by now we're talking just 1% speedup on "git-rev-list --objects --all", and we're definitely at the point where tree walking is no longer the issue any more. ] NOTE! Not everybody wants to use this new helper function, since some of the tree walkers very much on purpose do the descriptor update separately from the entry extraction. So the "extract + update" sequence still remains as the core sequence, this is just a simplified interface. We should probably add a silly two-line inline helper function for initializing the descriptor from the "struct tree" too, just to cut down on the noise from that common "desc" initializer. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-31 00:45:45 +08:00
struct name_entry entry;
struct object *obj = &tree->object;
if (!has_object_file(&obj->oid))
return;
if (parse_tree(tree) < 0)
die("bad tree %s", oid_to_hex(&obj->oid));
init_tree_desc(&desc, tree->buffer, tree->size);
tree_entry(): new tree-walking helper function This adds a "tree_entry()" function that combines the common operation of doing a "tree_entry_extract()" + "update_tree_entry()". It also has a simplified calling convention, designed for simple loops that traverse over a whole tree: the arguments are pointers to the tree descriptor and a name_entry structure to fill in, and it returns a boolean "true" if there was an entry left to be gotten in the tree. This allows tree traversal with struct tree_desc desc; struct name_entry entry; desc.buf = tree->buffer; desc.size = tree->size; while (tree_entry(&desc, &entry) { ... use "entry.{path, sha1, mode, pathlen}" ... } which is not only shorter than writing it out in full, it's hopefully less error prone too. [ It's actually a tad faster too - we don't need to recalculate the entry pathlength in both extract and update, but need to do it only once. Also, some callers can avoid doing a "strlen()" on the result, since it's returned as part of the name_entry structure. However, by now we're talking just 1% speedup on "git-rev-list --objects --all", and we're definitely at the point where tree walking is no longer the issue any more. ] NOTE! Not everybody wants to use this new helper function, since some of the tree walkers very much on purpose do the descriptor update separately from the entry extraction. So the "extract + update" sequence still remains as the core sequence, this is just a simplified interface. We should probably add a silly two-line inline helper function for initializing the descriptor from the "struct tree" too, just to cut down on the noise from that common "desc" initializer. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-05-31 00:45:45 +08:00
while (tree_entry(&desc, &entry)) {
switch (object_type(entry.mode)) {
case OBJ_TREE:
mark_tree_uninteresting(lookup_tree(entry.oid));
break;
case OBJ_BLOB:
mark_blob_uninteresting(lookup_blob(entry.oid));
break;
default:
/* Subproject commit - not in this repository */
break;
}
}
/*
* We don't care about the tree any more
* after it has been marked uninteresting.
*/
free_tree_buffer(tree);
}
revision: mark contents of an uninteresting tree uninteresting "git rev-list --objects ^A^{tree} B^{tree}" ought to mean "I want a list of objects inside B's tree, but please exclude the objects that appear inside A's tree". we see the top-level tree marked as uninteresting (i.e. ^A^{tree} in the above example) and call mark_tree_uninteresting() on it; this unfortunately prevents us from recursing into the tree and marking the objects in the tree as uninteresting. The reason why "git log ^A A" yields an empty set of commits, i.e. we do not have a similar issue for commits, is because we call mark_parents_uninteresting() after seeing an uninteresting commit. The uninteresting-ness of the commit itself does not prevent its parents from being marked as uninteresting. Introduce mark_tree_contents_uninteresting() and structure the code in handle_commit() in such a way that it makes it the responsibility of the callchain leading to this function to mark commits, trees and blobs as uninteresting, and also make it the responsibility of the helpers called from this function to mark objects that are reachable from them. Note that this is a very old bug that probably dates back to the day when "rev-list --objects" was introduced. The line to clear tree->object.parsed at the end of mark_tree_contents_uninteresting() can be removed when this fix is merged to the codebase after 6e454b9a (clear parsed flag when we free tree buffers, 2013-06-05). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-16 07:38:01 +08:00
void mark_tree_uninteresting(struct tree *tree)
{
struct object *obj;
revision: mark contents of an uninteresting tree uninteresting "git rev-list --objects ^A^{tree} B^{tree}" ought to mean "I want a list of objects inside B's tree, but please exclude the objects that appear inside A's tree". we see the top-level tree marked as uninteresting (i.e. ^A^{tree} in the above example) and call mark_tree_uninteresting() on it; this unfortunately prevents us from recursing into the tree and marking the objects in the tree as uninteresting. The reason why "git log ^A A" yields an empty set of commits, i.e. we do not have a similar issue for commits, is because we call mark_parents_uninteresting() after seeing an uninteresting commit. The uninteresting-ness of the commit itself does not prevent its parents from being marked as uninteresting. Introduce mark_tree_contents_uninteresting() and structure the code in handle_commit() in such a way that it makes it the responsibility of the callchain leading to this function to mark commits, trees and blobs as uninteresting, and also make it the responsibility of the helpers called from this function to mark objects that are reachable from them. Note that this is a very old bug that probably dates back to the day when "rev-list --objects" was introduced. The line to clear tree->object.parsed at the end of mark_tree_contents_uninteresting() can be removed when this fix is merged to the codebase after 6e454b9a (clear parsed flag when we free tree buffers, 2013-06-05). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-16 07:38:01 +08:00
if (!tree)
return;
obj = &tree->object;
revision: mark contents of an uninteresting tree uninteresting "git rev-list --objects ^A^{tree} B^{tree}" ought to mean "I want a list of objects inside B's tree, but please exclude the objects that appear inside A's tree". we see the top-level tree marked as uninteresting (i.e. ^A^{tree} in the above example) and call mark_tree_uninteresting() on it; this unfortunately prevents us from recursing into the tree and marking the objects in the tree as uninteresting. The reason why "git log ^A A" yields an empty set of commits, i.e. we do not have a similar issue for commits, is because we call mark_parents_uninteresting() after seeing an uninteresting commit. The uninteresting-ness of the commit itself does not prevent its parents from being marked as uninteresting. Introduce mark_tree_contents_uninteresting() and structure the code in handle_commit() in such a way that it makes it the responsibility of the callchain leading to this function to mark commits, trees and blobs as uninteresting, and also make it the responsibility of the helpers called from this function to mark objects that are reachable from them. Note that this is a very old bug that probably dates back to the day when "rev-list --objects" was introduced. The line to clear tree->object.parsed at the end of mark_tree_contents_uninteresting() can be removed when this fix is merged to the codebase after 6e454b9a (clear parsed flag when we free tree buffers, 2013-06-05). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-16 07:38:01 +08:00
if (obj->flags & UNINTERESTING)
return;
obj->flags |= UNINTERESTING;
mark_tree_contents_uninteresting(tree);
}
void mark_parents_uninteresting(struct commit *commit)
{
struct commit_list *parents = NULL, *l;
for (l = commit->parents; l; l = l->next)
commit_list_insert(l->item, &parents);
while (parents) {
struct commit *commit = pop_commit(&parents);
while (commit) {
/*
* A missing commit is ok iff its parent is marked
* uninteresting.
*
* We just mark such a thing parsed, so that when
* it is popped next time around, we won't be trying
* to parse it and get an error.
*/
if (!has_object_file(&commit->object.oid))
commit->object.parsed = 1;
if (commit->object.flags & UNINTERESTING)
break;
commit->object.flags |= UNINTERESTING;
/*
* Normally we haven't parsed the parent
* yet, so we won't have a parent of a parent
* here. However, it may turn out that we've
* reached this commit some other way (where it
* wasn't uninteresting), in which case we need
* to mark its parents recursively too..
*/
if (!commit->parents)
break;
for (l = commit->parents->next; l; l = l->next)
commit_list_insert(l->item, &parents);
commit = commit->parents->item;
}
}
}
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
static void add_pending_object_with_path(struct rev_info *revs,
struct object *obj,
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
const char *name, unsigned mode,
const char *path)
{
if (!obj)
return;
if (revs->no_walk && (obj->flags & UNINTERESTING))
revs->no_walk = 0;
if (revs->reflog_info && obj->type == OBJ_COMMIT) {
struct strbuf buf = STRBUF_INIT;
interpret_branch_name: allow callers to restrict expansions The interpret_branch_name() function converts names like @{-1} and @{upstream} into branch names. The expanded ref names are not fully qualified, and may be outside of the refs/heads/ namespace (e.g., "@" expands to "HEAD", and "@{upstream}" is likely to be in "refs/remotes/"). This is OK for callers like dwim_ref() which are primarily interested in resolving the resulting name, no matter where it is. But callers like "git branch" treat the result as a branch name in refs/heads/. When we expand to a ref outside that namespace, the results are very confusing (e.g., "git branch @" tries to create refs/heads/HEAD, which is nonsense). Callers can't know from the returned string how the expansion happened (e.g., did the user really ask for a branch named "HEAD", or did we do a bogus expansion?). One fix would be to return some out-parameters describing the types of expansion that occurred. This has the benefit that the caller can generate precise error messages ("I understood @{upstream} to mean origin/master, but that is a remote tracking branch, so you cannot create it as a local name"). However, out-parameters make the function interface somewhat cumbersome. Instead, let's do the opposite: let the caller tell us which elements to expand. That's easier to pass in, and none of the callers give more precise error messages than "@{upstream} isn't a valid branch name" anyway (which should be sufficient). The strbuf_branchname() function needs a similar parameter, as most of the callers access interpret_branch_name() through it. We can break the callers down into two groups: 1. Callers that are happy with any kind of ref in the result. We pass "0" here, so they continue to work without restrictions. This includes merge_name(), the reflog handling in add_pending_object_with_path(), and substitute_branch_name(). This last is what powers dwim_ref(). 2. Callers that have funny corner cases (mostly in git-branch and git-checkout). These need to make use of the new parameter, but I've left them as "0" in this patch, and will address them individually in follow-on patches. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-03-02 16:23:01 +08:00
int len = interpret_branch_name(name, 0, &buf, 0);
int st;
if (0 < len && name[len] && buf.len)
strbuf_addstr(&buf, name + len);
st = add_reflog_for_walk(revs->reflog_info,
(struct commit *)obj,
buf.buf[0] ? buf.buf: name);
strbuf_release(&buf);
if (st)
return;
}
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
add_object_array_with_path(obj, name, &revs->pending, mode, path);
}
static void add_pending_object_with_mode(struct rev_info *revs,
struct object *obj,
const char *name, unsigned mode)
{
add_pending_object_with_path(revs, obj, name, mode, NULL);
}
void add_pending_object(struct rev_info *revs,
struct object *obj, const char *name)
{
add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
}
void add_head_to_pending(struct rev_info *revs)
{
struct object_id oid;
struct object *obj;
if (get_oid("HEAD", &oid))
return;
obj = parse_object(oid.hash);
if (!obj)
return;
add_pending_object(revs, obj, "HEAD");
}
static struct object *get_reference(struct rev_info *revs, const char *name,
const struct object_id *oid,
unsigned int flags)
{
struct object *object;
object = parse_object(oid->hash);
if (!object) {
if (revs->ignore_missing)
return object;
die("bad object %s", name);
}
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
object->flags |= flags;
return object;
}
void add_pending_oid(struct rev_info *revs, const char *name,
const struct object_id *oid, unsigned int flags)
{
struct object *object = get_reference(revs, name, oid, flags);
add_pending_object(revs, object, name);
}
static struct commit *handle_commit(struct rev_info *revs,
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
struct object_array_entry *entry)
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
{
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
struct object *object = entry->item;
const char *name = entry->name;
const char *path = entry->path;
unsigned int mode = entry->mode;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
unsigned long flags = object->flags;
/*
* Tag object? Look what it points to..
*/
while (object->type == OBJ_TAG) {
struct tag *tag = (struct tag *) object;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
if (revs->tag_objects && !(flags & UNINTERESTING))
add_pending_object(revs, object, tag->tag);
if (!tag->tagged)
die("bad tag");
object = parse_object(tag->tagged->oid.hash);
if (!object) {
if (flags & UNINTERESTING)
return NULL;
die("bad object %s", oid_to_hex(&tag->tagged->oid));
}
object->flags |= flags;
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
/*
* We'll handle the tagged object by looping or dropping
* through to the non-tag handlers below. Do not
* propagate path data from the tag's pending entry.
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
*/
path = NULL;
mode = 0;
}
/*
* Commit object? Just return it, we'll do all the complex
* reachability crud.
*/
if (object->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *)object;
if (parse_commit(commit) < 0)
die("unable to parse commit %s", name);
if (flags & UNINTERESTING) {
mark_parents_uninteresting(commit);
revs->limited = 1;
}
if (revs->show_source && !commit->util)
commit->util = xstrdup(name);
return commit;
}
/*
* Tree object? Either mark it uninteresting, or add it
* to the list of objects to look at later..
*/
if (object->type == OBJ_TREE) {
struct tree *tree = (struct tree *)object;
if (!revs->tree_objects)
return NULL;
if (flags & UNINTERESTING) {
revision: mark contents of an uninteresting tree uninteresting "git rev-list --objects ^A^{tree} B^{tree}" ought to mean "I want a list of objects inside B's tree, but please exclude the objects that appear inside A's tree". we see the top-level tree marked as uninteresting (i.e. ^A^{tree} in the above example) and call mark_tree_uninteresting() on it; this unfortunately prevents us from recursing into the tree and marking the objects in the tree as uninteresting. The reason why "git log ^A A" yields an empty set of commits, i.e. we do not have a similar issue for commits, is because we call mark_parents_uninteresting() after seeing an uninteresting commit. The uninteresting-ness of the commit itself does not prevent its parents from being marked as uninteresting. Introduce mark_tree_contents_uninteresting() and structure the code in handle_commit() in such a way that it makes it the responsibility of the callchain leading to this function to mark commits, trees and blobs as uninteresting, and also make it the responsibility of the helpers called from this function to mark objects that are reachable from them. Note that this is a very old bug that probably dates back to the day when "rev-list --objects" was introduced. The line to clear tree->object.parsed at the end of mark_tree_contents_uninteresting() can be removed when this fix is merged to the codebase after 6e454b9a (clear parsed flag when we free tree buffers, 2013-06-05). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-01-16 07:38:01 +08:00
mark_tree_contents_uninteresting(tree);
return NULL;
}
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
add_pending_object_with_path(revs, object, name, mode, path);
return NULL;
}
/*
* Blob object? You know the drill by now..
*/
if (object->type == OBJ_BLOB) {
if (!revs->blob_objects)
return NULL;
if (flags & UNINTERESTING)
return NULL;
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
add_pending_object_with_path(revs, object, name, mode, path);
return NULL;
}
die("%s is unknown object", name);
}
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
static int everybody_uninteresting(struct commit_list *orig,
struct commit **interesting_cache)
{
struct commit_list *list = orig;
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
if (*interesting_cache) {
struct commit *commit = *interesting_cache;
if (!(commit->object.flags & UNINTERESTING))
return 0;
}
while (list) {
struct commit *commit = list->item;
list = list->next;
if (commit->object.flags & UNINTERESTING)
continue;
*interesting_cache = commit;
return 0;
}
return 1;
}
/*
* A definition of "relevant" commit that we can use to simplify limited graphs
* by eliminating side branches.
*
* A "relevant" commit is one that is !UNINTERESTING (ie we are including it
* in our list), or that is a specified BOTTOM commit. Then after computing
* a limited list, during processing we can generally ignore boundary merges
* coming from outside the graph, (ie from irrelevant parents), and treat
* those merges as if they were single-parent. TREESAME is defined to consider
* only relevant parents, if any. If we are TREESAME to our on-graph parents,
* we don't care if we were !TREESAME to non-graph parents.
*
* Treating bottom commits as relevant ensures that a limited graph's
* connection to the actual bottom commit is not viewed as a side branch, but
* treated as part of the graph. For example:
*
* ....Z...A---X---o---o---B
* . /
* W---Y
*
* When computing "A..B", the A-X connection is at least as important as
* Y-X, despite A being flagged UNINTERESTING.
*
* And when computing --ancestry-path "A..B", the A-X connection is more
* important than Y-X, despite both A and Y being flagged UNINTERESTING.
*/
static inline int relevant_commit(struct commit *commit)
{
return (commit->object.flags & (UNINTERESTING | BOTTOM)) != UNINTERESTING;
}
/*
* Return a single relevant commit from a parent list. If we are a TREESAME
* commit, and this selects one of our parents, then we can safely simplify to
* that parent.
*/
static struct commit *one_relevant_parent(const struct rev_info *revs,
struct commit_list *orig)
{
struct commit_list *list = orig;
struct commit *relevant = NULL;
if (!orig)
return NULL;
/*
* For 1-parent commits, or if first-parent-only, then return that
* first parent (even if not "relevant" by the above definition).
* TREESAME will have been set purely on that parent.
*/
if (revs->first_parent_only || !orig->next)
return orig->item;
/*
* For multi-parent commits, identify a sole relevant parent, if any.
* If we have only one relevant parent, then TREESAME will be set purely
* with regard to that parent, and we can simplify accordingly.
*
* If we have more than one relevant parent, or no relevant parents
* (and multiple irrelevant ones), then we can't select a parent here
* and return NULL.
*/
while (list) {
struct commit *commit = list->item;
list = list->next;
if (relevant_commit(commit)) {
if (relevant)
return NULL;
relevant = commit;
}
}
return relevant;
}
/*
* The goal is to get REV_TREE_NEW as the result only if the
* diff consists of all '+' (and no other changes), REV_TREE_OLD
* if the whole diff is removal of old data, and otherwise
* REV_TREE_DIFFERENT (of course if the trees are the same we
* want REV_TREE_SAME).
* That means that once we get to REV_TREE_DIFFERENT, we do not
* have to look any further.
*/
static int tree_difference = REV_TREE_SAME;
static void file_add_remove(struct diff_options *options,
int addremove, unsigned mode,
const unsigned char *sha1,
diff: do not use null sha1 as a sentinel value The diff code represents paths using the diff_filespec struct. This struct has a sha1 to represent the sha1 of the content at that path, as well as a sha1_valid member which indicates whether its sha1 field is actually useful. If sha1_valid is not true, then the filespec represents a working tree file (e.g., for the no-index case, or for when the index is not up-to-date). The diff_filespec is only used internally, though. At the interfaces to the diff subsystem, callers feed the sha1 directly, and we create a diff_filespec from it. It's at that point that we look at the sha1 and decide whether it is valid or not; callers may pass the null sha1 as a sentinel value to indicate that it is not. We should not typically see the null sha1 coming from any other source (e.g., in the index itself, or from a tree). However, a corrupt tree might have a null sha1, which would cause "diff --patch" to accidentally diff the working tree version of a file instead of treating it as a blob. This patch extends the edges of the diff interface to accept a "sha1_valid" flag whenever we accept a sha1, and to use that flag when creating a filespec. In some cases, this means passing the flag through several layers, making the code change larger than would be desirable. One alternative would be to simply die() upon seeing corrupted trees with null sha1s. However, this fix more directly addresses the problem (while bogus sha1s in a tree are probably a bad thing, it is really the sentinel confusion sending us down the wrong code path that is what makes it devastating). And it means that git is more capable of examining and debugging these corrupted trees. For example, you can still "diff --raw" such a tree to find out when the bogus entry was introduced; you just cannot do a "--patch" diff (just as you could not with any other corrupted tree, as we do not have any content to diff). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-28 23:03:01 +08:00
int sha1_valid,
const char *fullpath, unsigned dirty_submodule)
{
int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
tree_difference |= diff;
if (tree_difference == REV_TREE_DIFFERENT)
DIFF_OPT_SET(options, HAS_CHANGES);
}
static void file_change(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const unsigned char *old_sha1,
const unsigned char *new_sha1,
diff: do not use null sha1 as a sentinel value The diff code represents paths using the diff_filespec struct. This struct has a sha1 to represent the sha1 of the content at that path, as well as a sha1_valid member which indicates whether its sha1 field is actually useful. If sha1_valid is not true, then the filespec represents a working tree file (e.g., for the no-index case, or for when the index is not up-to-date). The diff_filespec is only used internally, though. At the interfaces to the diff subsystem, callers feed the sha1 directly, and we create a diff_filespec from it. It's at that point that we look at the sha1 and decide whether it is valid or not; callers may pass the null sha1 as a sentinel value to indicate that it is not. We should not typically see the null sha1 coming from any other source (e.g., in the index itself, or from a tree). However, a corrupt tree might have a null sha1, which would cause "diff --patch" to accidentally diff the working tree version of a file instead of treating it as a blob. This patch extends the edges of the diff interface to accept a "sha1_valid" flag whenever we accept a sha1, and to use that flag when creating a filespec. In some cases, this means passing the flag through several layers, making the code change larger than would be desirable. One alternative would be to simply die() upon seeing corrupted trees with null sha1s. However, this fix more directly addresses the problem (while bogus sha1s in a tree are probably a bad thing, it is really the sentinel confusion sending us down the wrong code path that is what makes it devastating). And it means that git is more capable of examining and debugging these corrupted trees. For example, you can still "diff --raw" such a tree to find out when the bogus entry was introduced; you just cannot do a "--patch" diff (just as you could not with any other corrupted tree, as we do not have any content to diff). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-28 23:03:01 +08:00
int old_sha1_valid, int new_sha1_valid,
const char *fullpath,
unsigned old_dirty_submodule, unsigned new_dirty_submodule)
{
tree_difference = REV_TREE_DIFFERENT;
DIFF_OPT_SET(options, HAS_CHANGES);
}
static int rev_compare_tree(struct rev_info *revs,
struct commit *parent, struct commit *commit)
{
struct tree *t1 = parent->tree;
struct tree *t2 = commit->tree;
if (!t1)
return REV_TREE_NEW;
if (!t2)
return REV_TREE_OLD;
if (revs->simplify_by_decoration) {
/*
* If we are simplifying by decoration, then the commit
* is worth showing if it has a tag pointing at it.
*/
if (get_name_decoration(&commit->object))
return REV_TREE_DIFFERENT;
/*
* A commit that is not pointed by a tag is uninteresting
* if we are not limited by path. This means that you will
* see the usual "commits that touch the paths" plus any
* tagged commit by specifying both --simplify-by-decoration
* and pathspec.
*/
if (!revs->prune_data.nr)
return REV_TREE_SAME;
}
tree_difference = REV_TREE_SAME;
DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
if (diff_tree_sha1(t1->object.oid.hash, t2->object.oid.hash, "",
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
&revs->pruning) < 0)
return REV_TREE_DIFFERENT;
return tree_difference;
}
static int rev_same_tree_as_empty(struct rev_info *revs, struct commit *commit)
{
int retval;
struct tree *t1 = commit->tree;
if (!t1)
return 0;
tree_difference = REV_TREE_SAME;
DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
retval = diff_tree_sha1(NULL, t1->object.oid.hash, "", &revs->pruning);
return retval >= 0 && (tree_difference == REV_TREE_SAME);
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
struct treesame_state {
unsigned int nparents;
unsigned char treesame[FLEX_ARRAY];
};
static struct treesame_state *initialise_treesame(struct rev_info *revs, struct commit *commit)
{
unsigned n = commit_list_count(commit->parents);
struct treesame_state *st = xcalloc(1, st_add(sizeof(*st), n));
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
st->nparents = n;
add_decoration(&revs->treesame, &commit->object, st);
return st;
}
/*
* Must be called immediately after removing the nth_parent from a commit's
* parent list, if we are maintaining the per-parent treesame[] decoration.
* This does not recalculate the master TREESAME flag - update_treesame()
* should be called to update it after a sequence of treesame[] modifications
* that may have affected it.
*/
static int compact_treesame(struct rev_info *revs, struct commit *commit, unsigned nth_parent)
{
struct treesame_state *st;
int old_same;
if (!commit->parents) {
/*
* Have just removed the only parent from a non-merge.
* Different handling, as we lack decoration.
*/
if (nth_parent != 0)
die("compact_treesame %u", nth_parent);
old_same = !!(commit->object.flags & TREESAME);
if (rev_same_tree_as_empty(revs, commit))
commit->object.flags |= TREESAME;
else
commit->object.flags &= ~TREESAME;
return old_same;
}
st = lookup_decoration(&revs->treesame, &commit->object);
if (!st || nth_parent >= st->nparents)
die("compact_treesame %u", nth_parent);
old_same = st->treesame[nth_parent];
memmove(st->treesame + nth_parent,
st->treesame + nth_parent + 1,
st->nparents - nth_parent - 1);
/*
* If we've just become a non-merge commit, update TREESAME
* immediately, and remove the no-longer-needed decoration.
* If still a merge, defer update until update_treesame().
*/
if (--st->nparents == 1) {
if (commit->parents->next)
die("compact_treesame parents mismatch");
if (st->treesame[0] && revs->dense)
commit->object.flags |= TREESAME;
else
commit->object.flags &= ~TREESAME;
free(add_decoration(&revs->treesame, &commit->object, NULL));
}
return old_same;
}
static unsigned update_treesame(struct rev_info *revs, struct commit *commit)
{
if (commit->parents && commit->parents->next) {
unsigned n;
struct treesame_state *st;
struct commit_list *p;
unsigned relevant_parents;
unsigned relevant_change, irrelevant_change;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
st = lookup_decoration(&revs->treesame, &commit->object);
if (!st)
die("update_treesame %s", oid_to_hex(&commit->object.oid));
relevant_parents = 0;
relevant_change = irrelevant_change = 0;
for (p = commit->parents, n = 0; p; n++, p = p->next) {
if (relevant_commit(p->item)) {
relevant_change |= !st->treesame[n];
relevant_parents++;
} else
irrelevant_change |= !st->treesame[n];
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
}
if (relevant_parents ? relevant_change : irrelevant_change)
commit->object.flags &= ~TREESAME;
else
commit->object.flags |= TREESAME;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
}
return commit->object.flags & TREESAME;
}
static inline int limiting_can_increase_treesame(const struct rev_info *revs)
{
/*
* TREESAME is irrelevant unless prune && dense;
* if simplify_history is set, we can't have a mixture of TREESAME and
* !TREESAME INTERESTING parents (and we don't have treesame[]
* decoration anyway);
* if first_parent_only is set, then the TREESAME flag is locked
* against the first parent (and again we lack treesame[] decoration).
*/
return revs->prune && revs->dense &&
!revs->simplify_history &&
!revs->first_parent_only;
}
static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
{
struct commit_list **pp, *parent;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
struct treesame_state *ts = NULL;
int relevant_change = 0, irrelevant_change = 0;
int relevant_parents, nth_parent;
/*
* If we don't do pruning, everything is interesting
*/
if (!revs->prune)
return;
if (!commit->tree)
return;
if (!commit->parents) {
if (rev_same_tree_as_empty(revs, commit))
commit->object.flags |= TREESAME;
return;
}
/*
* Normal non-merge commit? If we don't want to make the
* history dense, we consider it always to be a change..
*/
if (!revs->dense && !commit->parents->next)
return;
for (pp = &commit->parents, nth_parent = 0, relevant_parents = 0;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
(parent = *pp) != NULL;
pp = &parent->next, nth_parent++) {
struct commit *p = parent->item;
if (relevant_commit(p))
relevant_parents++;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
if (nth_parent == 1) {
/*
* This our second loop iteration - so we now know
* we're dealing with a merge.
*
* Do not compare with later parents when we care only about
* the first parent chain, in order to avoid derailing the
* traversal to follow a side branch that brought everything
* in the path we are limited to by the pathspec.
*/
if (revs->first_parent_only)
break;
/*
* If this will remain a potentially-simplifiable
* merge, remember per-parent treesame if needed.
* Initialise the array with the comparison from our
* first iteration.
*/
if (revs->treesame.name &&
!revs->simplify_history &&
!(commit->object.flags & UNINTERESTING)) {
ts = initialise_treesame(revs, commit);
if (!(irrelevant_change || relevant_change))
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
ts->treesame[0] = 1;
}
}
if (parse_commit(p) < 0)
die("cannot simplify commit %s (because of %s)",
oid_to_hex(&commit->object.oid),
oid_to_hex(&p->object.oid));
switch (rev_compare_tree(revs, p, commit)) {
case REV_TREE_SAME:
if (!revs->simplify_history || !relevant_commit(p)) {
/* Even if a merge with an uninteresting
* side branch brought the entire change
* we are interested in, we do not want
* to lose the other branches of this
* merge, so we just keep going.
*/
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
if (ts)
ts->treesame[nth_parent] = 1;
continue;
}
parent->next = NULL;
commit->parents = parent;
commit->object.flags |= TREESAME;
return;
case REV_TREE_NEW:
if (revs->remove_empty_trees &&
rev_same_tree_as_empty(revs, p)) {
/* We are adding all the specified
* paths from this parent, so the
* history beyond this parent is not
* interesting. Remove its parents
* (they are grandparents for us).
* IOW, we pretend this parent is a
* "root" commit.
*/
if (parse_commit(p) < 0)
die("cannot simplify commit %s (invalid %s)",
oid_to_hex(&commit->object.oid),
oid_to_hex(&p->object.oid));
p->parents = NULL;
}
/* fallthrough */
case REV_TREE_OLD:
case REV_TREE_DIFFERENT:
if (relevant_commit(p))
relevant_change = 1;
else
irrelevant_change = 1;
continue;
}
die("bad tree compare for commit %s", oid_to_hex(&commit->object.oid));
}
/*
* TREESAME is straightforward for single-parent commits. For merge
* commits, it is most useful to define it so that "irrelevant"
* parents cannot make us !TREESAME - if we have any relevant
* parents, then we only consider TREESAMEness with respect to them,
* allowing irrelevant merges from uninteresting branches to be
* simplified away. Only if we have only irrelevant parents do we
* base TREESAME on them. Note that this logic is replicated in
* update_treesame, which should be kept in sync.
*/
if (relevant_parents ? !relevant_change : !irrelevant_change)
commit->object.flags |= TREESAME;
}
static void commit_list_insert_by_date_cached(struct commit *p, struct commit_list **head,
struct commit_list *cached_base, struct commit_list **cache)
{
struct commit_list *new_entry;
if (cached_base && p->date < cached_base->item->date)
new_entry = commit_list_insert_by_date(p, &cached_base->next);
else
new_entry = commit_list_insert_by_date(p, head);
if (cache && (!*cache || p->date < (*cache)->item->date))
*cache = new_entry;
}
static int add_parents_to_list(struct rev_info *revs, struct commit *commit,
struct commit_list **list, struct commit_list **cache_ptr)
{
struct commit_list *parent = commit->parents;
unsigned left_flag;
struct commit_list *cached_base = cache_ptr ? *cache_ptr : NULL;
if (commit->object.flags & ADDED)
return 0;
commit->object.flags |= ADDED;
if (revs->include_check &&
!revs->include_check(commit, revs->include_check_data))
return 0;
/*
* If the commit is uninteresting, don't try to
* prune parents - we want the maximal uninteresting
* set.
*
* Normally we haven't parsed the parent
* yet, so we won't have a parent of a parent
* here. However, it may turn out that we've
* reached this commit some other way (where it
* wasn't uninteresting), in which case we need
* to mark its parents recursively too..
*/
if (commit->object.flags & UNINTERESTING) {
while (parent) {
struct commit *p = parent->item;
parent = parent->next;
if (p)
p->object.flags |= UNINTERESTING;
if (parse_commit_gently(p, 1) < 0)
continue;
if (p->parents)
mark_parents_uninteresting(p);
if (p->object.flags & SEEN)
continue;
p->object.flags |= SEEN;
commit_list_insert_by_date_cached(p, list, cached_base, cache_ptr);
}
return 0;
}
/*
* Ok, the commit wasn't uninteresting. Try to
* simplify the commit history and find the parent
* that has no differences in the path set if one exists.
*/
try_to_simplify_commit(revs, commit);
if (revs->no_walk)
return 0;
left_flag = (commit->object.flags & SYMMETRIC_LEFT);
for (parent = commit->parents; parent; parent = parent->next) {
struct commit *p = parent->item;
if (parse_commit_gently(p, revs->ignore_missing_links) < 0)
return -1;
if (revs->show_source && !p->util)
p->util = commit->util;
p->object.flags |= left_flag;
if (!(p->object.flags & SEEN)) {
p->object.flags |= SEEN;
commit_list_insert_by_date_cached(p, list, cached_base, cache_ptr);
}
if (revs->first_parent_only)
break;
}
return 0;
}
static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
{
struct commit_list *p;
int left_count = 0, right_count = 0;
int left_first;
struct patch_ids ids;
unsigned cherry_flag;
/* First count the commits on the left and on the right */
for (p = list; p; p = p->next) {
struct commit *commit = p->item;
unsigned flags = commit->object.flags;
if (flags & BOUNDARY)
;
else if (flags & SYMMETRIC_LEFT)
left_count++;
else
right_count++;
}
if (!left_count || !right_count)
return;
left_first = left_count < right_count;
init_patch_ids(&ids);
ids.diffopts.pathspec = revs->diffopt.pathspec;
/* Compute patch-ids for one side */
for (p = list; p; p = p->next) {
struct commit *commit = p->item;
unsigned flags = commit->object.flags;
if (flags & BOUNDARY)
continue;
/*
* If we have fewer left, left_first is set and we omit
* commits on the right branch in this loop. If we have
* fewer right, we skip the left ones.
*/
if (left_first != !!(flags & SYMMETRIC_LEFT))
continue;
add_commit_patch_id(commit, &ids);
}
/* either cherry_mark or cherry_pick are true */
cherry_flag = revs->cherry_mark ? PATCHSAME : SHOWN;
/* Check the other side */
for (p = list; p; p = p->next) {
struct commit *commit = p->item;
struct patch_id *id;
unsigned flags = commit->object.flags;
if (flags & BOUNDARY)
continue;
/*
* If we have fewer left, left_first is set and we omit
* commits on the left branch in this loop.
*/
if (left_first == !!(flags & SYMMETRIC_LEFT))
continue;
/*
* Have we seen the same patch id?
*/
id = has_commit_patch_id(commit, &ids);
if (!id)
continue;
commit->object.flags |= cherry_flag;
id->commit->object.flags |= cherry_flag;
}
free_patch_ids(&ids);
}
/* How many extra uninteresting commits we want to see.. */
#define SLOP 5
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
static int still_interesting(struct commit_list *src, unsigned long date, int slop,
struct commit **interesting_cache)
Add "--show-all" revision walker flag for debugging It's really not very easy to visualize the commit walker, because - on purpose - it obvously doesn't show the uninteresting commits! This adds a "--show-all" flag to the revision walker, which will make it show uninteresting commits too, and they'll have a '^' in front of them (it also fixes a logic error for !verbose_header for boundary commits - we should show the '-' even if left_right isn't shown). A separate patch to gitk to teach it the new '^' was sent to paulus. With the change in place, it actually is interesting even for the cases that git doesn't have any problems with, ie for the kernel you can do: gitk -d --show-all v2.6.24.. and you see just how far down it has to parse things to see it all. The use of "-d" is a good idea, since the date-ordered toposort is much better at showing why it goes deep down (ie the date of some of those commits after 2.6.24 is much older, because they were merged from trees that weren't rebased). So I think this is a useful feature even for non-debugging - just to visualize what git does internally more. When it actually breaks out due to the "everybody_uninteresting()" case, it adds the uninteresting commits (both the one it's looking at now, and the list of pending ones) to the list This way, we really list *all* the commits we've looked at. Because we now end up listing commits we may not even have been parsed at all "show_log" and "show_commit" need to protect against commits that don't have a commit buffer entry. That second part is debatable just how it should work. Maybe we shouldn't show such entries at all (with this patch those entries do get shown, they just don't get any message shown with them). But I think this is a useful case. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-10 06:02:07 +08:00
{
/*
* No source list at all? We're definitely done..
*/
if (!src)
return 0;
/*
* Does the destination list contain entries with a date
* before the source list? Definitely _not_ done.
*/
if (date <= src->item->date)
return SLOP;
/*
* Does the source list still have interesting commits in
* it? Definitely not done..
*/
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
if (!everybody_uninteresting(src, interesting_cache))
return SLOP;
/* Ok, we're closing in.. */
return slop-1;
Add "--show-all" revision walker flag for debugging It's really not very easy to visualize the commit walker, because - on purpose - it obvously doesn't show the uninteresting commits! This adds a "--show-all" flag to the revision walker, which will make it show uninteresting commits too, and they'll have a '^' in front of them (it also fixes a logic error for !verbose_header for boundary commits - we should show the '-' even if left_right isn't shown). A separate patch to gitk to teach it the new '^' was sent to paulus. With the change in place, it actually is interesting even for the cases that git doesn't have any problems with, ie for the kernel you can do: gitk -d --show-all v2.6.24.. and you see just how far down it has to parse things to see it all. The use of "-d" is a good idea, since the date-ordered toposort is much better at showing why it goes deep down (ie the date of some of those commits after 2.6.24 is much older, because they were merged from trees that weren't rebased). So I think this is a useful feature even for non-debugging - just to visualize what git does internally more. When it actually breaks out due to the "everybody_uninteresting()" case, it adds the uninteresting commits (both the one it's looking at now, and the list of pending ones) to the list This way, we really list *all* the commits we've looked at. Because we now end up listing commits we may not even have been parsed at all "show_log" and "show_commit" need to protect against commits that don't have a commit buffer entry. That second part is debatable just how it should work. Maybe we shouldn't show such entries at all (with this patch those entries do get shown, they just don't get any message shown with them). But I think this is a useful case. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-10 06:02:07 +08:00
}
/*
* "rev-list --ancestry-path A..B" computes commits that are ancestors
* of B but not ancestors of A but further limits the result to those
* that are descendants of A. This takes the list of bottom commits and
* the result of "A..B" without --ancestry-path, and limits the latter
* further to the ones that can reach one of the commits in "bottom".
*/
static void limit_to_ancestry(struct commit_list *bottom, struct commit_list *list)
{
struct commit_list *p;
struct commit_list *rlist = NULL;
int made_progress;
/*
* Reverse the list so that it will be likely that we would
* process parents before children.
*/
for (p = list; p; p = p->next)
commit_list_insert(p->item, &rlist);
for (p = bottom; p; p = p->next)
p->item->object.flags |= TMP_MARK;
/*
* Mark the ones that can reach bottom commits in "list",
* in a bottom-up fashion.
*/
do {
made_progress = 0;
for (p = rlist; p; p = p->next) {
struct commit *c = p->item;
struct commit_list *parents;
if (c->object.flags & (TMP_MARK | UNINTERESTING))
continue;
for (parents = c->parents;
parents;
parents = parents->next) {
if (!(parents->item->object.flags & TMP_MARK))
continue;
c->object.flags |= TMP_MARK;
made_progress = 1;
break;
}
}
} while (made_progress);
/*
* NEEDSWORK: decide if we want to remove parents that are
* not marked with TMP_MARK from commit->parents for commits
* in the resulting list. We may not want to do that, though.
*/
/*
* The ones that are not marked with TMP_MARK are uninteresting
*/
for (p = list; p; p = p->next) {
struct commit *c = p->item;
if (c->object.flags & TMP_MARK)
continue;
c->object.flags |= UNINTERESTING;
}
/* We are done with the TMP_MARK */
for (p = list; p; p = p->next)
p->item->object.flags &= ~TMP_MARK;
for (p = bottom; p; p = p->next)
p->item->object.flags &= ~TMP_MARK;
free_commit_list(rlist);
}
/*
* Before walking the history, keep the set of "negative" refs the
* caller has asked to exclude.
*
* This is used to compute "rev-list --ancestry-path A..B", as we need
* to filter the result of "A..B" further to the ones that can actually
* reach A.
*/
static struct commit_list *collect_bottom_commits(struct commit_list *list)
{
struct commit_list *elem, *bottom = NULL;
for (elem = list; elem; elem = elem->next)
if (elem->item->object.flags & BOTTOM)
commit_list_insert(elem->item, &bottom);
return bottom;
}
/* Assumes either left_only or right_only is set */
static void limit_left_right(struct commit_list *list, struct rev_info *revs)
{
struct commit_list *p;
for (p = list; p; p = p->next) {
struct commit *commit = p->item;
if (revs->right_only) {
if (commit->object.flags & SYMMETRIC_LEFT)
commit->object.flags |= SHOWN;
} else /* revs->left_only is set */
if (!(commit->object.flags & SYMMETRIC_LEFT))
commit->object.flags |= SHOWN;
}
}
static int limit_list(struct rev_info *revs)
{
int slop = SLOP;
unsigned long date = ~0ul;
struct commit_list *list = revs->commits;
struct commit_list *newlist = NULL;
struct commit_list **p = &newlist;
struct commit_list *bottom = NULL;
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
struct commit *interesting_cache = NULL;
if (revs->ancestry_path) {
bottom = collect_bottom_commits(list);
if (!bottom)
die("--ancestry-path given but there are no bottom commits");
}
while (list) {
struct commit *commit = pop_commit(&list);
struct object *obj = &commit->object;
show_early_output_fn_t show;
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
if (commit == interesting_cache)
interesting_cache = NULL;
if (revs->max_age != -1 && (commit->date < revs->max_age))
obj->flags |= UNINTERESTING;
if (add_parents_to_list(revs, commit, &list, NULL) < 0)
return -1;
if (obj->flags & UNINTERESTING) {
mark_parents_uninteresting(commit);
if (revs->show_all)
p = &commit_list_insert(commit, p)->next;
limit_list: avoid quadratic behavior from still_interesting When we are limiting a rev-list traversal due to UNINTERESTING refs, we have to walk down the tips (both interesting and uninteresting) to find where they intersect. We keep a queue of commits to examine, pop commits off the queue one by one, and potentially add their parents. The size of the queue will naturally fluctuate based on the "width" of the history graph; i.e., the number of simultaneous lines of development. But for the most part it will stay in the same ballpark as the initial number of tips we fed, shrinking over time (as we hit common ancestors of the tips). So roughly speaking, if we start with `N` tips, we'll spend much of the time with a queue around `N` items. For each UNINTERESTING commit we pop, we call still_interesting to check whether marking its parents as UNINTERESTING has made the whole queue uninteresting (in which case we can quit early). Because the queue is stored as a linked list, this is `O(N)`, where `N` is the number of items in the queue. So processing a queue with `N` commits marked UNINTERESTING (and one or more interesting commits) will take `O(N^2)`. If you feed a lot of positive tips, this isn't a problem. They aren't UNINTERESTING, so they don't incur the still_interesting check. It also isn't a problem if you traverse from an interesting tip to some UNINTERESTING bases. We order the queue by recency, so the interesting commits stay at the front of the queue as we walk down them. The linear check can exit early as soon as it sees one interesting commit left in the queue. But if you want to know whether an older commit is reachable from a set of newer tips, we end up processing in the opposite direction: from the UNINTERESTING ones down to the interesting one. This may happen when we call: git rev-list $commits --not --all in check_everything_connected after a fetch. If we fetched something much older than most of our refs, and if we have a large number of refs, the traversal cost is dominated by the quadratic behavior. These commands simulate the connectivity check of such a fetch, when you have `$n` distinct refs in the receiver: # positive ref is 100,000 commits deep git rev-list --all | head -100000 | tail -1 >input # huge number of more recent negative refs git rev-list --all | head -$n | sed s/^/^/ >>input time git rev-list --stdin <input Here are timings for various `n` on the linux.git repository. The `n=1` case provides a baseline for just walking the commits, which lets us see the still_interesting overhead. The times marked with `+` subtract that baseline to show just the extra time growth due to the large number of refs. The `x` numbers show the slowdown of the adjusted time versus the prior trial. n | before | after -------------------------------------------------------- 1 | 0.991s | 0.848s 10000 | 1.120s (+0.129s) | 0.885s (+0.037s) 20000 | 1.451s (+0.460s, 3.5x) | 0.923s (+0.075s, 2.0x) 40000 | 2.731s (+1.740s, 3.8x) | 0.994s (+0.146s, 1.9x) 80000 | 8.235s (+7.244s, 4.2x) | 1.123s (+0.275s, 1.9x) Each trial doubles `n`, so you can see the quadratic (`4x`) behavior before this patch. Afterwards, we have a roughly linear relationship. The implementation is fairly straightforward. Whenever we do the linear search, we cache the interesting commit we find, and next time check it before doing another linear search. If that commit is removed from the list or becomes UNINTERESTING itself, then we fall back to the linear search. This is very similar to the trick used by fce87ae (Fix quadratic performance in rewrite_one., 2008-07-12). I considered and rejected several possible alternatives: 1. Keep a count of UNINTERESTING commits in the queue. This requires managing the count not only when removing an item from the queue, but also when marking an item as UNINTERESTING. That requires touching the other functions which mark commits, and would require knowing quickly which commits are in the queue (lookup in the queue is linear, so we would need an auxiliary structure or to also maintain an IN_QUEUE flag in each commit object). 2. Keep a separate list of interesting commits. Drop items from it when they are dropped from the queue, or if they become UNINTERESTING. This again suffers from extra complexity to maintain the list, not to mention CPU and memory. 3. Use a better data structure for the queue. This is something that could help the fix in fce87ae, because we order the queue by recency, and it is about inserting quickly in recency order. So a normal priority queue would help there. But here, we cannot disturb the order of the queue, which makes things harder. We really do need an auxiliary index to track the flag we care about, which is basically option (2) above. The "cache" trick is simple, and the numbers above show that it works well in practice. This is because the length of time it takes to find an interesting commit is proportional to the length of time it will remain cached (i.e., if we have to walk a long way to find it, it also means we have to pop a lot of elements in the queue until we get rid of it and have to find another interesting commit). The worst case is still quadratic, though. We could have `N` uninteresting commits at the front of the queue, followed by `N` interesting commits, where commit `i` has parent `i+N`. When we pop commit `i`, we will notice that the parent of the next commit, `i+1+N` is still interesting and cache it. But then handling commit `i+1`, we will mark its parent `i+1+N` uninteresting, and immediately invalidate our cache. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-04-18 06:11:04 +08:00
slop = still_interesting(list, date, slop, &interesting_cache);
if (slop)
Add "--show-all" revision walker flag for debugging It's really not very easy to visualize the commit walker, because - on purpose - it obvously doesn't show the uninteresting commits! This adds a "--show-all" flag to the revision walker, which will make it show uninteresting commits too, and they'll have a '^' in front of them (it also fixes a logic error for !verbose_header for boundary commits - we should show the '-' even if left_right isn't shown). A separate patch to gitk to teach it the new '^' was sent to paulus. With the change in place, it actually is interesting even for the cases that git doesn't have any problems with, ie for the kernel you can do: gitk -d --show-all v2.6.24.. and you see just how far down it has to parse things to see it all. The use of "-d" is a good idea, since the date-ordered toposort is much better at showing why it goes deep down (ie the date of some of those commits after 2.6.24 is much older, because they were merged from trees that weren't rebased). So I think this is a useful feature even for non-debugging - just to visualize what git does internally more. When it actually breaks out due to the "everybody_uninteresting()" case, it adds the uninteresting commits (both the one it's looking at now, and the list of pending ones) to the list This way, we really list *all* the commits we've looked at. Because we now end up listing commits we may not even have been parsed at all "show_log" and "show_commit" need to protect against commits that don't have a commit buffer entry. That second part is debatable just how it should work. Maybe we shouldn't show such entries at all (with this patch those entries do get shown, they just don't get any message shown with them). But I think this is a useful case. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-10 06:02:07 +08:00
continue;
/* If showing all, add the whole pending list to the end */
if (revs->show_all)
*p = list;
break;
}
if (revs->min_age != -1 && (commit->date > revs->min_age))
continue;
date = commit->date;
p = &commit_list_insert(commit, p)->next;
show = show_early_output;
if (!show)
continue;
show(revs, newlist);
show_early_output = NULL;
}
if (revs->cherry_pick || revs->cherry_mark)
cherry_pick_list(newlist, revs);
if (revs->left_only || revs->right_only)
limit_left_right(newlist, revs);
if (bottom) {
limit_to_ancestry(bottom, newlist);
free_commit_list(bottom);
}
/*
* Check if any commits have become TREESAME by some of their parents
* becoming UNINTERESTING.
*/
if (limiting_can_increase_treesame(revs))
for (list = newlist; list; list = list->next) {
struct commit *c = list->item;
if (c->object.flags & (UNINTERESTING | TREESAME))
continue;
update_treesame(revs, c);
}
revs->commits = newlist;
return 0;
}
/*
* Add an entry to refs->cmdline with the specified information.
* *name is copied.
*/
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
static void add_rev_cmdline(struct rev_info *revs,
struct object *item,
const char *name,
int whence,
unsigned flags)
{
struct rev_cmdline_info *info = &revs->cmdline;
int nr = info->nr;
ALLOC_GROW(info->rev, nr + 1, info->alloc);
info->rev[nr].item = item;
info->rev[nr].name = xstrdup(name);
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
info->rev[nr].whence = whence;
info->rev[nr].flags = flags;
info->nr++;
}
static void add_rev_cmdline_list(struct rev_info *revs,
struct commit_list *commit_list,
int whence,
unsigned flags)
{
while (commit_list) {
struct object *object = &commit_list->item->object;
add_rev_cmdline(revs, object, oid_to_hex(&object->oid),
whence, flags);
commit_list = commit_list->next;
}
}
struct all_refs_cb {
int all_flags;
int warned_bad_reflog;
struct rev_info *all_revs;
const char *name_for_errormsg;
};
int ref_excluded(struct string_list *ref_excludes, const char *path)
{
struct string_list_item *item;
if (!ref_excludes)
return 0;
for_each_string_list_item(item, ref_excludes) {
if (!wildmatch(item->string, path, 0, NULL))
return 1;
}
return 0;
}
static int handle_one_ref(const char *path, const struct object_id *oid,
int flag, void *cb_data)
{
struct all_refs_cb *cb = cb_data;
struct object *object;
if (ref_excluded(cb->all_revs->ref_excludes, path))
return 0;
object = get_reference(cb->all_revs, path, oid, cb->all_flags);
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
add_rev_cmdline(cb->all_revs, object, path, REV_CMD_REF, cb->all_flags);
add_pending_oid(cb->all_revs, path, oid, cb->all_flags);
return 0;
}
static void init_all_refs_cb(struct all_refs_cb *cb, struct rev_info *revs,
unsigned flags)
{
cb->all_revs = revs;
cb->all_flags = flags;
}
void clear_ref_exclusion(struct string_list **ref_excludes_p)
{
if (*ref_excludes_p) {
string_list_clear(*ref_excludes_p, 0);
free(*ref_excludes_p);
}
*ref_excludes_p = NULL;
}
void add_ref_exclusion(struct string_list **ref_excludes_p, const char *exclude)
{
if (!*ref_excludes_p) {
*ref_excludes_p = xcalloc(1, sizeof(**ref_excludes_p));
(*ref_excludes_p)->strdup_strings = 1;
}
string_list_append(*ref_excludes_p, exclude);
}
static void handle_refs(const char *submodule, struct rev_info *revs, unsigned flags,
int (*for_each)(const char *, each_ref_fn, void *))
{
struct all_refs_cb cb;
init_all_refs_cb(&cb, revs, flags);
for_each(submodule, handle_one_ref, &cb);
}
static void handle_one_reflog_commit(struct object_id *oid, void *cb_data)
{
struct all_refs_cb *cb = cb_data;
if (!is_null_oid(oid)) {
struct object *o = parse_object(oid->hash);
if (o) {
o->flags |= cb->all_flags;
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
/* ??? CMDLINEFLAGS ??? */
add_pending_object(cb->all_revs, o, "");
}
else if (!cb->warned_bad_reflog) {
warning("reflog of '%s' references pruned commits",
cb->name_for_errormsg);
cb->warned_bad_reflog = 1;
}
}
}
static int handle_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
const char *email, unsigned long timestamp, int tz,
const char *message, void *cb_data)
{
handle_one_reflog_commit(ooid, cb_data);
handle_one_reflog_commit(noid, cb_data);
return 0;
}
static int handle_one_reflog(const char *path, const struct object_id *oid,
int flag, void *cb_data)
{
struct all_refs_cb *cb = cb_data;
cb->warned_bad_reflog = 0;
cb->name_for_errormsg = path;
for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
return 0;
}
void add_reflogs_to_pending(struct rev_info *revs, unsigned flags)
{
struct all_refs_cb cb;
cb.all_revs = revs;
cb.all_flags = flags;
for_each_reflog(handle_one_reflog, &cb);
}
static void add_cache_tree(struct cache_tree *it, struct rev_info *revs,
struct strbuf *path)
{
size_t baselen = path->len;
int i;
if (it->entry_count >= 0) {
struct tree *tree = lookup_tree(&it->oid);
add_pending_object_with_path(revs, &tree->object, "",
040000, path->buf);
}
for (i = 0; i < it->subtree_nr; i++) {
struct cache_tree_sub *sub = it->down[i];
strbuf_addf(path, "%s%s", baselen ? "/" : "", sub->name);
add_cache_tree(sub->cache_tree, revs, path);
strbuf_setlen(path, baselen);
}
}
void add_index_objects_to_pending(struct rev_info *revs, unsigned flags)
{
int i;
read_cache();
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
struct blob *blob;
if (S_ISGITLINK(ce->ce_mode))
continue;
blob = lookup_blob(&ce->oid);
if (!blob)
die("unable to add index blob to traversal");
add_pending_object_with_path(revs, &blob->object, "",
ce->ce_mode, ce->name);
}
if (active_cache_tree) {
struct strbuf path = STRBUF_INIT;
add_cache_tree(active_cache_tree, revs, &path);
strbuf_release(&path);
}
}
static int add_parents_only(struct rev_info *revs, const char *arg_, int flags,
int exclude_parent)
{
struct object_id oid;
struct object *it;
struct commit *commit;
struct commit_list *parents;
int parent_number;
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
const char *arg = arg_;
if (*arg == '^') {
flags ^= UNINTERESTING | BOTTOM;
arg++;
}
if (get_sha1_committish(arg, oid.hash))
return 0;
while (1) {
it = get_reference(revs, arg, &oid, 0);
if (!it && revs->ignore_missing)
return 0;
if (it->type != OBJ_TAG)
break;
if (!((struct tag*)it)->tagged)
return 0;
oidcpy(&oid, &((struct tag*)it)->tagged->oid);
}
if (it->type != OBJ_COMMIT)
return 0;
commit = (struct commit *)it;
if (exclude_parent &&
exclude_parent > commit_list_count(commit->parents))
return 0;
for (parents = commit->parents, parent_number = 1;
parents;
parents = parents->next, parent_number++) {
if (exclude_parent && parent_number != exclude_parent)
continue;
it = &parents->item->object;
it->flags |= flags;
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
add_rev_cmdline(revs, it, arg_, REV_CMD_PARENTS_ONLY, flags);
add_pending_object(revs, it, arg);
}
return 1;
}
void init_revisions(struct rev_info *revs, const char *prefix)
{
memset(revs, 0, sizeof(*revs));
revs->abbrev = DEFAULT_ABBREV;
revs->ignore_merges = 1;
gitweb.cgi history not shown This does: - add a "rev.simplify_history" flag which defaults to on - it turns it off for "git whatchanged" (which thus now has real semantics outside of "git log") - it adds a command line flag ("--full-history") to turn it off for others (ie you can make "git log" and "gitk" etc get the semantics if you want to. Now, just as an example of _why_ you really really really want to simplify history by default, apply this patch, install it, and try these two command lines: gitk --full-history -- git.c gitk -- git.c and compare the output. So with this, you can also now do git whatchanged -p -- gitweb.cgi git log -p --full-history -- gitweb.cgi and it will show the old history of gitweb.cgi, even though it's not relevant to the _current_ state of the name "gitweb.cgi" NOTE NOTE NOTE! It will still actually simplify away merges that didn't change anything at all into either child. That creates these bogus strange discontinuities if you look at it with "gitk" (look at the --full-history gitk output for git.c, and you'll see a few strange cases). So the whole "--parent" thing ends up somewhat bogus with --full-history because of this, but I'm not sure it's worth even worrying about. I don't think you'd ever want to really use "--full-history" with the graphical representation, I just give it as an example exactly to show _why_ doing so would be insane. I think this is trivial enough and useful enough to be worth merging into the stable branch. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-12 01:57:35 +08:00
revs->simplify_history = 1;
DIFF_OPT_SET(&revs->pruning, RECURSIVE);
DIFF_OPT_SET(&revs->pruning, QUICK);
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
revs->pruning.add_remove = file_add_remove;
revs->pruning.change = file_change;
toposort: rename "lifo" field The primary invariant of sort_in_topological_order() is that a parent commit is not emitted until all children of it are. When traversing a forked history like this with "git log C E": A----B----C \ D----E we ensure that A is emitted after all of B, C, D, and E are done, B has to wait until C is done, and D has to wait until E is done. In some applications, however, we would further want to control how these child commits B, C, D and E on two parallel ancestry chains are shown. Most of the time, we would want to see C and B emitted together, and then E and D, and finally A (i.e. the --topo-order output). The "lifo" parameter of the sort_in_topological_order() function is used to control this behaviour. We start the traversal by knowing two commits, C and E. While keeping in mind that we also need to inspect E later, we pick C first to inspect, and we notice and record that B needs to be inspected. By structuring the "work to be done" set as a LIFO stack, we ensure that B is inspected next, before other in-flight commits we had known that we will need to inspect, e.g. E. When showing in --date-order, we would want to see commits ordered by timestamps, i.e. show C, E, B and D in this order before showing A, possibly mixing commits from two parallel histories together. When "lifo" parameter is set to false, the function keeps the "work to be done" set sorted in the date order to realize this semantics. After inspecting C, we add B to the "work to be done" set, but the next commit we inspect from the set is E which is newer than B. The name "lifo", however, is too strongly tied to the way how the function implements its behaviour, and does not describe what the behaviour _means_. Replace this field with an enum rev_sort_order, with two possible values: REV_SORT_IN_GRAPH_ORDER and REV_SORT_BY_COMMIT_DATE, and update the existing code. The mechanical replacement rule is: "lifo == 0" is equivalent to "sort_order == REV_SORT_BY_COMMIT_DATE" "lifo == 1" is equivalent to "sort_order == REV_SORT_IN_GRAPH_ORDER" Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-07 07:07:14 +08:00
revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
revs->dense = 1;
revs->prefix = prefix;
revs->max_age = -1;
revs->min_age = -1;
revs->skip_count = -1;
revs->max_count = -1;
revs->max_parents = -1;
revs->expand_tabs_in_log = -1;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
revs->commit_format = CMIT_FMT_DEFAULT;
revs->expand_tabs_in_log_default = 8;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
init_grep_defaults();
grep_init(&revs->grep_filter, prefix);
revs->grep_filter.status_only = 1;
revs->grep_filter.regflags = REG_NEWLINE;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
diff_setup(&revs->diffopt);
if (prefix && !revs->diffopt.prefix) {
diff --relative: output paths as relative to the current subdirectory This adds --relative option to the diff family. When you start from a subdirectory: $ git diff --relative shows only the diff that is inside your current subdirectory, and without $prefix part. People who usually live in subdirectories may like it. There are a few things I should also mention about the change: - This works not just with diff but also works with the log family of commands, but the history pruning is not affected. In other words, if you go to a subdirectory, you can say: $ git log --relative -p but it will show the log message even for commits that do not touch the current directory. You can limit it by giving pathspec yourself: $ git log --relative -p . This originally was not a conscious design choice, but we have a way to affect diff pathspec and pruning pathspec independently. IOW "git log --full-diff -p ." tells it to prune history to commits that affect the current subdirectory but show the changes with full context. I think it makes more sense to leave pruning independent from --relative than the obvious alternative of always pruning with the current subdirectory, which would break the symmetry. - Because this works also with the log family, you could format-patch a single change, limiting the effect to your subdirectory, like so: $ cd gitk-git $ git format-patch -1 --relative 911f1eb But because that is a special purpose usage, this option will never become the default, with or without repository or user preference configuration. The risk of producing a partial patch and sending it out by mistake is too great if we did so. - This is inherently incompatible with --no-index, which is a bolted-on hack that does not have much to do with git itself. I didn't bother checking and erroring out on the combined use of the options, but probably I should. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-13 06:26:02 +08:00
revs->diffopt.prefix = prefix;
revs->diffopt.prefix_length = strlen(prefix);
}
revs->notes_opt.use_default_notes = -1;
}
static void add_pending_commit_list(struct rev_info *revs,
struct commit_list *commit_list,
unsigned int flags)
{
while (commit_list) {
struct object *object = &commit_list->item->object;
object->flags |= flags;
add_pending_object(revs, object, oid_to_hex(&object->oid));
commit_list = commit_list->next;
}
}
static void prepare_show_merge(struct rev_info *revs)
{
struct commit_list *bases;
struct commit *head, *other;
struct object_id oid;
const char **prune = NULL;
int i, prune_num = 1; /* counting terminating NULL */
if (get_oid("HEAD", &oid))
die("--merge without HEAD?");
Convert lookup_commit* to struct object_id Convert lookup_commit, lookup_commit_or_die, lookup_commit_reference, and lookup_commit_reference_gently to take struct object_id arguments. Introduce a temporary in parse_object buffer in order to convert this function. This is required since in order to convert parse_object and parse_object_buffer, lookup_commit_reference_gently and lookup_commit_or_die would need to be converted. Not introducing a temporary would therefore require that lookup_commit_or_die take a struct object_id *, but lookup_commit would take unsigned char *, leaving a confusing and hard-to-use interface. parse_object_buffer will lose this temporary in a later patch. This commit was created with manual changes to commit.c, commit.h, and object.c, plus the following semantic patch: @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1.hash, E2) + lookup_commit_reference_gently(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1->hash, E2) + lookup_commit_reference_gently(E1, E2) @@ expression E1; @@ - lookup_commit_reference(E1.hash) + lookup_commit_reference(&E1) @@ expression E1; @@ - lookup_commit_reference(E1->hash) + lookup_commit_reference(E1) @@ expression E1; @@ - lookup_commit(E1.hash) + lookup_commit(&E1) @@ expression E1; @@ - lookup_commit(E1->hash) + lookup_commit(E1) @@ expression E1, E2; @@ - lookup_commit_or_die(E1.hash, E2) + lookup_commit_or_die(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_or_die(E1->hash, E2) + lookup_commit_or_die(E1, E2) Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-07 06:10:10 +08:00
head = lookup_commit_or_die(&oid, "HEAD");
if (get_oid("MERGE_HEAD", &oid))
die("--merge without MERGE_HEAD?");
Convert lookup_commit* to struct object_id Convert lookup_commit, lookup_commit_or_die, lookup_commit_reference, and lookup_commit_reference_gently to take struct object_id arguments. Introduce a temporary in parse_object buffer in order to convert this function. This is required since in order to convert parse_object and parse_object_buffer, lookup_commit_reference_gently and lookup_commit_or_die would need to be converted. Not introducing a temporary would therefore require that lookup_commit_or_die take a struct object_id *, but lookup_commit would take unsigned char *, leaving a confusing and hard-to-use interface. parse_object_buffer will lose this temporary in a later patch. This commit was created with manual changes to commit.c, commit.h, and object.c, plus the following semantic patch: @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1.hash, E2) + lookup_commit_reference_gently(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1->hash, E2) + lookup_commit_reference_gently(E1, E2) @@ expression E1; @@ - lookup_commit_reference(E1.hash) + lookup_commit_reference(&E1) @@ expression E1; @@ - lookup_commit_reference(E1->hash) + lookup_commit_reference(E1) @@ expression E1; @@ - lookup_commit(E1.hash) + lookup_commit(&E1) @@ expression E1; @@ - lookup_commit(E1->hash) + lookup_commit(E1) @@ expression E1, E2; @@ - lookup_commit_or_die(E1.hash, E2) + lookup_commit_or_die(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_or_die(E1->hash, E2) + lookup_commit_or_die(E1, E2) Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-07 06:10:10 +08:00
other = lookup_commit_or_die(&oid, "MERGE_HEAD");
add_pending_object(revs, &head->object, "HEAD");
add_pending_object(revs, &other->object, "MERGE_HEAD");
bases = get_merge_bases(head, other);
add_rev_cmdline_list(revs, bases, REV_CMD_MERGE_BASE, UNINTERESTING | BOTTOM);
add_pending_commit_list(revs, bases, UNINTERESTING | BOTTOM);
free_commit_list(bases);
head->object.flags |= SYMMETRIC_LEFT;
if (!active_nr)
read_cache();
for (i = 0; i < active_nr; i++) {
Convert "struct cache_entry *" to "const ..." wherever possible I attempted to make index_state->cache[] a "const struct cache_entry **" to find out how existing entries in index are modified and where. The question I have is what do we do if we really need to keep track of on-disk changes in the index. The result is - diff-lib.c: setting CE_UPTODATE - name-hash.c: setting CE_HASHED - preload-index.c, read-cache.c, unpack-trees.c and builtin/update-index: obvious - entry.c: write_entry() may refresh the checked out entry via fill_stat_cache_info(). This causes "non-const struct cache_entry *" in builtin/apply.c, builtin/checkout-index.c and builtin/checkout.c - builtin/ls-files.c: --with-tree changes stagemask and may set CE_UPDATE Of these, write_entry() and its call sites are probably most interesting because it modifies on-disk info. But this is stat info and can be retrieved via refresh, at least for porcelain commands. Other just uses ce_flags for local purposes. So, keeping track of "dirty" entries is just a matter of setting a flag in index modification functions exposed by read-cache.c. Except unpack-trees, the rest of the code base does not do anything funny behind read-cache's back. The actual patch is less valueable than the summary above. But if anyone wants to re-identify the above sites. Applying this patch, then this: diff --git a/cache.h b/cache.h index 430d021..1692891 100644 --- a/cache.h +++ b/cache.h @@ -267,7 +267,7 @@ static inline unsigned int canon_mode(unsigned int mode) #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) struct index_state { - struct cache_entry **cache; + const struct cache_entry **cache; unsigned int version; unsigned int cache_nr, cache_alloc, cache_changed; struct string_list *resolve_undo; will help quickly identify them without bogus warnings. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-09 23:29:00 +08:00
const struct cache_entry *ce = active_cache[i];
if (!ce_stage(ce))
continue;
if (ce_path_match(ce, &revs->prune_data, NULL)) {
prune_num++;
REALLOC_ARRAY(prune, prune_num);
prune[prune_num-2] = ce->name;
prune[prune_num-1] = NULL;
}
while ((i+1 < active_nr) &&
ce_same_name(ce, active_cache[i+1]))
i++;
}
clear_pathspec(&revs->prune_data);
parse_pathspec(&revs->prune_data, PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL,
PATHSPEC_PREFER_FULL | PATHSPEC_LITERAL_PATH, "", prune);
revs->limited = 1;
}
int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsigned revarg_opt)
{
struct object_context oc;
char *dotdot;
struct object *object;
struct object_id oid;
int local_flags;
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
const char *arg = arg_;
int cant_be_filename = revarg_opt & REVARG_CANNOT_BE_FILENAME;
unsigned get_sha1_flags = 0;
flags = flags & UNINTERESTING ? flags | BOTTOM : flags & ~BOTTOM;
dotdot = strstr(arg, "..");
if (dotdot) {
struct object_id from_oid;
const char *next = dotdot + 2;
const char *this = arg;
int symmetric = *next == '.';
unsigned int flags_exclude = flags ^ (UNINTERESTING | BOTTOM);
static const char head_by_default[] = "HEAD";
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
unsigned int a_flags;
*dotdot = 0;
next += symmetric;
if (!*next)
next = head_by_default;
if (dotdot == arg)
this = head_by_default;
if (this == head_by_default && next == head_by_default &&
!symmetric) {
/*
* Just ".."? That is not a range but the
* pathspec for the parent directory.
*/
if (!cant_be_filename) {
*dotdot = '.';
return -1;
}
}
if (!get_sha1_committish(this, from_oid.hash) &&
!get_sha1_committish(next, oid.hash)) {
struct object *a_obj, *b_obj;
if (!cant_be_filename) {
*dotdot = '.';
verify_non_filename(revs->prefix, arg);
}
a_obj = parse_object(from_oid.hash);
b_obj = parse_object(oid.hash);
if (!a_obj || !b_obj) {
missing:
if (revs->ignore_missing)
return 0;
die(symmetric
? "Invalid symmetric difference expression %s"
: "Invalid revision range %s", arg);
}
if (!symmetric) {
/* just A..B */
a_flags = flags_exclude;
} else {
/* A...B -- find merge bases between the two */
struct commit *a, *b;
struct commit_list *exclude;
a = (a_obj->type == OBJ_COMMIT
? (struct commit *)a_obj
Convert lookup_commit* to struct object_id Convert lookup_commit, lookup_commit_or_die, lookup_commit_reference, and lookup_commit_reference_gently to take struct object_id arguments. Introduce a temporary in parse_object buffer in order to convert this function. This is required since in order to convert parse_object and parse_object_buffer, lookup_commit_reference_gently and lookup_commit_or_die would need to be converted. Not introducing a temporary would therefore require that lookup_commit_or_die take a struct object_id *, but lookup_commit would take unsigned char *, leaving a confusing and hard-to-use interface. parse_object_buffer will lose this temporary in a later patch. This commit was created with manual changes to commit.c, commit.h, and object.c, plus the following semantic patch: @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1.hash, E2) + lookup_commit_reference_gently(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1->hash, E2) + lookup_commit_reference_gently(E1, E2) @@ expression E1; @@ - lookup_commit_reference(E1.hash) + lookup_commit_reference(&E1) @@ expression E1; @@ - lookup_commit_reference(E1->hash) + lookup_commit_reference(E1) @@ expression E1; @@ - lookup_commit(E1.hash) + lookup_commit(&E1) @@ expression E1; @@ - lookup_commit(E1->hash) + lookup_commit(E1) @@ expression E1, E2; @@ - lookup_commit_or_die(E1.hash, E2) + lookup_commit_or_die(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_or_die(E1->hash, E2) + lookup_commit_or_die(E1, E2) Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-07 06:10:10 +08:00
: lookup_commit_reference(&a_obj->oid));
b = (b_obj->type == OBJ_COMMIT
? (struct commit *)b_obj
Convert lookup_commit* to struct object_id Convert lookup_commit, lookup_commit_or_die, lookup_commit_reference, and lookup_commit_reference_gently to take struct object_id arguments. Introduce a temporary in parse_object buffer in order to convert this function. This is required since in order to convert parse_object and parse_object_buffer, lookup_commit_reference_gently and lookup_commit_or_die would need to be converted. Not introducing a temporary would therefore require that lookup_commit_or_die take a struct object_id *, but lookup_commit would take unsigned char *, leaving a confusing and hard-to-use interface. parse_object_buffer will lose this temporary in a later patch. This commit was created with manual changes to commit.c, commit.h, and object.c, plus the following semantic patch: @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1.hash, E2) + lookup_commit_reference_gently(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_reference_gently(E1->hash, E2) + lookup_commit_reference_gently(E1, E2) @@ expression E1; @@ - lookup_commit_reference(E1.hash) + lookup_commit_reference(&E1) @@ expression E1; @@ - lookup_commit_reference(E1->hash) + lookup_commit_reference(E1) @@ expression E1; @@ - lookup_commit(E1.hash) + lookup_commit(&E1) @@ expression E1; @@ - lookup_commit(E1->hash) + lookup_commit(E1) @@ expression E1, E2; @@ - lookup_commit_or_die(E1.hash, E2) + lookup_commit_or_die(&E1, E2) @@ expression E1, E2; @@ - lookup_commit_or_die(E1->hash, E2) + lookup_commit_or_die(E1, E2) Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-05-07 06:10:10 +08:00
: lookup_commit_reference(&b_obj->oid));
if (!a || !b)
goto missing;
exclude = get_merge_bases(a, b);
add_rev_cmdline_list(revs, exclude,
REV_CMD_MERGE_BASE,
flags_exclude);
add_pending_commit_list(revs, exclude,
flags_exclude);
free_commit_list(exclude);
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
a_flags = flags | SYMMETRIC_LEFT;
}
a_obj->flags |= a_flags;
b_obj->flags |= flags;
add_rev_cmdline(revs, a_obj, this,
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
REV_CMD_LEFT, a_flags);
add_rev_cmdline(revs, b_obj, next,
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
REV_CMD_RIGHT, flags);
add_pending_object(revs, a_obj, this);
add_pending_object(revs, b_obj, next);
return 0;
}
*dotdot = '.';
}
dotdot = strstr(arg, "^@");
if (dotdot && !dotdot[2]) {
*dotdot = 0;
if (add_parents_only(revs, arg, flags, 0))
return 0;
*dotdot = '^';
}
dotdot = strstr(arg, "^!");
if (dotdot && !dotdot[2]) {
*dotdot = 0;
if (!add_parents_only(revs, arg, flags ^ (UNINTERESTING | BOTTOM), 0))
*dotdot = '^';
}
dotdot = strstr(arg, "^-");
if (dotdot) {
int exclude_parent = 1;
if (dotdot[2]) {
char *end;
exclude_parent = strtoul(dotdot + 2, &end, 10);
if (*end != '\0' || !exclude_parent)
return -1;
}
*dotdot = 0;
if (!add_parents_only(revs, arg, flags ^ (UNINTERESTING | BOTTOM), exclude_parent))
*dotdot = '^';
}
local_flags = 0;
if (*arg == '^') {
local_flags = UNINTERESTING | BOTTOM;
arg++;
}
if (revarg_opt & REVARG_COMMITTISH)
get_sha1_flags = GET_SHA1_COMMITTISH;
if (get_sha1_with_context(arg, get_sha1_flags, oid.hash, &oc))
return revs->ignore_missing ? 0 : -1;
if (!cant_be_filename)
verify_non_filename(revs->prefix, arg);
object = get_reference(revs, arg, &oid, flags ^ local_flags);
revision: keep track of the end-user input from the command line Given a complex set of revision specifiers on the command line, it is too late to look at the flags of the objects in the initial traversal list at the beginning of limit_list() in order to determine what the objects the end-user explicitly listed on the command line were. The process to move objects from the pending array to the traversal list may have marked objects that are not mentioned as UNINTERESTING, when handle_commit() marked the parents of UNINTERESTING commits mentioned on the command line by calling mark_parents_uninteresting(). This made "rev-list --ancestry-path ^A ..." to mistakenly list commits that are descendants of A's parents but that are not descendants of A itself, as ^A from the command line causes A and its parents marked as UNINTERESTING before coming to limit_list(), and we try to enumerate the commits that are descendants of these commits that are UNINTERESTING before we start walking the history. It actually is too late even if we inspected the pending object array before calling prepare_revision_walk(), as some of the same objects might have been mentioned twice, once as positive and another time as negative. The "rev-list --some-option A --not --all" command may want to notice, even if the resulting set is empty, that the user showed some interest in "A" and do something special about it. Prepare a separate array to keep track of what syntactic element was used to cause each object to appear in the pending array from the command line, and populate it as setup_revisions() parses the command line. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-08-26 08:35:39 +08:00
add_rev_cmdline(revs, object, arg_, REV_CMD_REV, flags ^ local_flags);
add_pending_object_with_mode(revs, object, arg, oc.mode);
return 0;
}
struct cmdline_pathspec {
int alloc;
int nr;
const char **path;
};
static void append_prune_data(struct cmdline_pathspec *prune, const char **av)
{
while (*av) {
ALLOC_GROW(prune->path, prune->nr + 1, prune->alloc);
prune->path[prune->nr++] = *(av++);
}
}
static void read_pathspec_from_stdin(struct rev_info *revs, struct strbuf *sb,
struct cmdline_pathspec *prune)
{
while (strbuf_getline(sb, stdin) != EOF) {
ALLOC_GROW(prune->path, prune->nr + 1, prune->alloc);
prune->path[prune->nr++] = xstrdup(sb->buf);
}
}
static void read_revisions_from_stdin(struct rev_info *revs,
struct cmdline_pathspec *prune)
{
struct strbuf sb;
int seen_dashdash = 0;
int save_warning;
save_warning = warn_on_object_refname_ambiguity;
warn_on_object_refname_ambiguity = 0;
strbuf_init(&sb, 1000);
while (strbuf_getline(&sb, stdin) != EOF) {
int len = sb.len;
if (!len)
break;
if (sb.buf[0] == '-') {
if (len == 2 && sb.buf[1] == '-') {
seen_dashdash = 1;
break;
}
die("options not supported in --stdin mode");
}
object_array_entry: fix memory handling of the name field Previously, the memory management of the object_array_entry::name field was inconsistent and undocumented. object_array_entries are ultimately created by a single function, add_object_array_with_mode(), which has an argument "const char *name". This function used to simply set the name field to reference the string pointed to by the name parameter, and nobody on the object_array side ever freed the memory. Thus, it assumed that the memory for the name field would be managed by the caller, and that the lifetime of that string would be at least as long as the lifetime of the object_array_entry. But callers were inconsistent: * Some passed pointers to constant strings or argv entries, which was OK. * Some passed pointers to newly-allocated memory, but didn't arrange for the memory ever to be freed. * Some passed the return value of sha1_to_hex(), which is a pointer to a statically-allocated buffer that can be overwritten at any time. * Some passed pointers to refnames that they received from a for_each_ref()-type iteration, but the lifetimes of such refnames is not guaranteed by the refs API. Bring consistency to this mess by changing object_array to make its own copy for the object_array_entry::name field and free this memory when an object_array_entry is deleted from the array. Many callers were passing the empty string as the name parameter, so as a performance optimization, treat the empty string specially. Instead of making a copy, store a pointer to a statically-allocated empty string to object_array_entry::name. When deleting such an entry, skip the free(). Change the callers that were already passing copies to add_object_array_with_mode() to either skip the copy, or (if the memory needed to be allocated anyway) freeing the memory itself. A part of this commit effectively reverts 70d26c6e76 read_revisions_from_stdin: make copies for handle_revision_arg because the copying introduced by that commit (which is still necessary) is now done at a deeper level. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-25 17:08:14 +08:00
if (handle_revision_arg(sb.buf, revs, 0,
REVARG_CANNOT_BE_FILENAME))
die("bad revision '%s'", sb.buf);
}
if (seen_dashdash)
read_pathspec_from_stdin(revs, &sb, prune);
strbuf_release(&sb);
warn_on_object_refname_ambiguity = save_warning;
}
static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
{
append_grep_pattern(&revs->grep_filter, ptn, "command line", 0, what);
}
log --author/--committer: really match only with name part When we tried to find commits done by AUTHOR, the first implementation tried to pattern match a line with "^author .*AUTHOR", which later was enhanced to strip leading caret and look for "^author AUTHOR" when the search pattern was anchored at the left end (i.e. --author="^AUTHOR"). This had a few problems: * When looking for fixed strings (e.g. "git log -F --author=x --grep=y"), the regexp internally used "^author .*x" would never match anything; * To match at the end (e.g. "git log --author='google.com>$'"), the generated regexp has to also match the trailing timestamp part the commit header lines have. Also, in order to determine if the '$' at the end means "match at the end of the line" or just a literal dollar sign (probably backslash-quoted), we would need to parse the regexp ourselves. An earlier alternative tried to make sure that a line matches "^author " (to limit by field name) and the user supplied pattern at the same time. While it solved the -F problem by introducing a special override for matching the "^author ", it did not solve the trailing timestamp nor tail match problem. It also would have matched every commit if --author=author was asked for, not because the author's email part had this string, but because every commit header line that talks about the author begins with that field name, regardleses of who wrote it. Instead of piling more hacks on top of hacks, this rethinks the grep machinery that is used to look for strings in the commit header, and makes sure that (1) field name matches literally at the beginning of the line, followed by a SP, and (2) the user supplied pattern is matched against the remainder of the line, excluding the trailing timestamp data. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-09-05 13:15:02 +08:00
static void add_header_grep(struct rev_info *revs, enum grep_header_field field, const char *pattern)
{
log --author/--committer: really match only with name part When we tried to find commits done by AUTHOR, the first implementation tried to pattern match a line with "^author .*AUTHOR", which later was enhanced to strip leading caret and look for "^author AUTHOR" when the search pattern was anchored at the left end (i.e. --author="^AUTHOR"). This had a few problems: * When looking for fixed strings (e.g. "git log -F --author=x --grep=y"), the regexp internally used "^author .*x" would never match anything; * To match at the end (e.g. "git log --author='google.com>$'"), the generated regexp has to also match the trailing timestamp part the commit header lines have. Also, in order to determine if the '$' at the end means "match at the end of the line" or just a literal dollar sign (probably backslash-quoted), we would need to parse the regexp ourselves. An earlier alternative tried to make sure that a line matches "^author " (to limit by field name) and the user supplied pattern at the same time. While it solved the -F problem by introducing a special override for matching the "^author ", it did not solve the trailing timestamp nor tail match problem. It also would have matched every commit if --author=author was asked for, not because the author's email part had this string, but because every commit header line that talks about the author begins with that field name, regardleses of who wrote it. Instead of piling more hacks on top of hacks, this rethinks the grep machinery that is used to look for strings in the commit header, and makes sure that (1) field name matches literally at the beginning of the line, followed by a SP, and (2) the user supplied pattern is matched against the remainder of the line, excluding the trailing timestamp data. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-09-05 13:15:02 +08:00
append_header_grep_pattern(&revs->grep_filter, field, pattern);
}
static void add_message_grep(struct rev_info *revs, const char *pattern)
{
add_grep(revs, pattern, GREP_PATTERN_BODY);
}
static int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
int *unkc, const char **unkv)
{
const char *arg = argv[0];
const char *optarg;
int argcount;
/* pseudo revision arguments */
if (!strcmp(arg, "--all") || !strcmp(arg, "--branches") ||
!strcmp(arg, "--tags") || !strcmp(arg, "--remotes") ||
!strcmp(arg, "--reflog") || !strcmp(arg, "--not") ||
!strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk") ||
!strcmp(arg, "--bisect") || starts_with(arg, "--glob=") ||
!strcmp(arg, "--indexed-objects") ||
starts_with(arg, "--exclude=") ||
starts_with(arg, "--branches=") || starts_with(arg, "--tags=") ||
starts_with(arg, "--remotes=") || starts_with(arg, "--no-walk="))
{
unkv[(*unkc)++] = arg;
return 1;
}
if ((argcount = parse_long_opt("max-count", argv, &optarg))) {
revs->max_count = atoi(optarg);
revs->no_walk = 0;
return argcount;
} else if ((argcount = parse_long_opt("skip", argv, &optarg))) {
revs->skip_count = atoi(optarg);
return argcount;
} else if ((*arg == '-') && isdigit(arg[1])) {
/* accept -<digit>, like traditional "head" */
if (strtol_i(arg + 1, 10, &revs->max_count) < 0 ||
revs->max_count < 0)
die("'%s': not a non-negative integer", arg + 1);
revs->no_walk = 0;
} else if (!strcmp(arg, "-n")) {
if (argc <= 1)
return error("-n requires an argument");
revs->max_count = atoi(argv[1]);
revs->no_walk = 0;
return 2;
} else if (starts_with(arg, "-n")) {
revs->max_count = atoi(arg + 2);
revs->no_walk = 0;
} else if ((argcount = parse_long_opt("max-age", argv, &optarg))) {
revs->max_age = atoi(optarg);
return argcount;
} else if ((argcount = parse_long_opt("since", argv, &optarg))) {
revs->max_age = approxidate(optarg);
return argcount;
} else if ((argcount = parse_long_opt("after", argv, &optarg))) {
revs->max_age = approxidate(optarg);
return argcount;
} else if ((argcount = parse_long_opt("min-age", argv, &optarg))) {
revs->min_age = atoi(optarg);
return argcount;
} else if ((argcount = parse_long_opt("before", argv, &optarg))) {
revs->min_age = approxidate(optarg);
return argcount;
} else if ((argcount = parse_long_opt("until", argv, &optarg))) {
revs->min_age = approxidate(optarg);
return argcount;
} else if (!strcmp(arg, "--first-parent")) {
revs->first_parent_only = 1;
} else if (!strcmp(arg, "--ancestry-path")) {
revs->ancestry_path = 1;
revs->simplify_history = 0;
revs->limited = 1;
} else if (!strcmp(arg, "-g") || !strcmp(arg, "--walk-reflogs")) {
init_reflog_walk(&revs->reflog_info);
} else if (!strcmp(arg, "--default")) {
if (argc <= 1)
return error("bad --default argument");
revs->def = argv[1];
return 2;
} else if (!strcmp(arg, "--merge")) {
revs->show_merge = 1;
} else if (!strcmp(arg, "--topo-order")) {
toposort: rename "lifo" field The primary invariant of sort_in_topological_order() is that a parent commit is not emitted until all children of it are. When traversing a forked history like this with "git log C E": A----B----C \ D----E we ensure that A is emitted after all of B, C, D, and E are done, B has to wait until C is done, and D has to wait until E is done. In some applications, however, we would further want to control how these child commits B, C, D and E on two parallel ancestry chains are shown. Most of the time, we would want to see C and B emitted together, and then E and D, and finally A (i.e. the --topo-order output). The "lifo" parameter of the sort_in_topological_order() function is used to control this behaviour. We start the traversal by knowing two commits, C and E. While keeping in mind that we also need to inspect E later, we pick C first to inspect, and we notice and record that B needs to be inspected. By structuring the "work to be done" set as a LIFO stack, we ensure that B is inspected next, before other in-flight commits we had known that we will need to inspect, e.g. E. When showing in --date-order, we would want to see commits ordered by timestamps, i.e. show C, E, B and D in this order before showing A, possibly mixing commits from two parallel histories together. When "lifo" parameter is set to false, the function keeps the "work to be done" set sorted in the date order to realize this semantics. After inspecting C, we add B to the "work to be done" set, but the next commit we inspect from the set is E which is newer than B. The name "lifo", however, is too strongly tied to the way how the function implements its behaviour, and does not describe what the behaviour _means_. Replace this field with an enum rev_sort_order, with two possible values: REV_SORT_IN_GRAPH_ORDER and REV_SORT_BY_COMMIT_DATE, and update the existing code. The mechanical replacement rule is: "lifo == 0" is equivalent to "sort_order == REV_SORT_BY_COMMIT_DATE" "lifo == 1" is equivalent to "sort_order == REV_SORT_IN_GRAPH_ORDER" Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-07 07:07:14 +08:00
revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
revs->topo_order = 1;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
} else if (!strcmp(arg, "--simplify-merges")) {
revs->simplify_merges = 1;
revs->topo_order = 1;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
revs->rewrite_parents = 1;
revs->simplify_history = 0;
revs->limited = 1;
} else if (!strcmp(arg, "--simplify-by-decoration")) {
revs->simplify_merges = 1;
revs->topo_order = 1;
revs->rewrite_parents = 1;
revs->simplify_history = 0;
revs->simplify_by_decoration = 1;
revs->limited = 1;
revs->prune = 1;
load_ref_decorations(DECORATE_SHORT_REFS);
} else if (!strcmp(arg, "--date-order")) {
toposort: rename "lifo" field The primary invariant of sort_in_topological_order() is that a parent commit is not emitted until all children of it are. When traversing a forked history like this with "git log C E": A----B----C \ D----E we ensure that A is emitted after all of B, C, D, and E are done, B has to wait until C is done, and D has to wait until E is done. In some applications, however, we would further want to control how these child commits B, C, D and E on two parallel ancestry chains are shown. Most of the time, we would want to see C and B emitted together, and then E and D, and finally A (i.e. the --topo-order output). The "lifo" parameter of the sort_in_topological_order() function is used to control this behaviour. We start the traversal by knowing two commits, C and E. While keeping in mind that we also need to inspect E later, we pick C first to inspect, and we notice and record that B needs to be inspected. By structuring the "work to be done" set as a LIFO stack, we ensure that B is inspected next, before other in-flight commits we had known that we will need to inspect, e.g. E. When showing in --date-order, we would want to see commits ordered by timestamps, i.e. show C, E, B and D in this order before showing A, possibly mixing commits from two parallel histories together. When "lifo" parameter is set to false, the function keeps the "work to be done" set sorted in the date order to realize this semantics. After inspecting C, we add B to the "work to be done" set, but the next commit we inspect from the set is E which is newer than B. The name "lifo", however, is too strongly tied to the way how the function implements its behaviour, and does not describe what the behaviour _means_. Replace this field with an enum rev_sort_order, with two possible values: REV_SORT_IN_GRAPH_ORDER and REV_SORT_BY_COMMIT_DATE, and update the existing code. The mechanical replacement rule is: "lifo == 0" is equivalent to "sort_order == REV_SORT_BY_COMMIT_DATE" "lifo == 1" is equivalent to "sort_order == REV_SORT_IN_GRAPH_ORDER" Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-07 07:07:14 +08:00
revs->sort_order = REV_SORT_BY_COMMIT_DATE;
revs->topo_order = 1;
} else if (!strcmp(arg, "--author-date-order")) {
revs->sort_order = REV_SORT_BY_AUTHOR_DATE;
revs->topo_order = 1;
} else if (starts_with(arg, "--early-output")) {
int count = 100;
switch (arg[14]) {
case '=':
count = atoi(arg+15);
/* Fallthrough */
case 0:
revs->topo_order = 1;
revs->early_output = count;
}
} else if (!strcmp(arg, "--parents")) {
revs->rewrite_parents = 1;
revs->print_parents = 1;
} else if (!strcmp(arg, "--dense")) {
revs->dense = 1;
} else if (!strcmp(arg, "--sparse")) {
revs->dense = 0;
} else if (!strcmp(arg, "--show-all")) {
revs->show_all = 1;
} else if (!strcmp(arg, "--remove-empty")) {
revs->remove_empty_trees = 1;
} else if (!strcmp(arg, "--merges")) {
revs->min_parents = 2;
} else if (!strcmp(arg, "--no-merges")) {
revs->max_parents = 1;
} else if (starts_with(arg, "--min-parents=")) {
revs->min_parents = atoi(arg+14);
} else if (starts_with(arg, "--no-min-parents")) {
revs->min_parents = 0;
} else if (starts_with(arg, "--max-parents=")) {
revs->max_parents = atoi(arg+14);
} else if (starts_with(arg, "--no-max-parents")) {
revs->max_parents = -1;
} else if (!strcmp(arg, "--boundary")) {
revs->boundary = 1;
} else if (!strcmp(arg, "--left-right")) {
revs->left_right = 1;
} else if (!strcmp(arg, "--left-only")) {
if (revs->right_only)
die("--left-only is incompatible with --right-only"
" or --cherry");
revs->left_only = 1;
} else if (!strcmp(arg, "--right-only")) {
if (revs->left_only)
die("--right-only is incompatible with --left-only");
revs->right_only = 1;
} else if (!strcmp(arg, "--cherry")) {
if (revs->left_only)
die("--cherry is incompatible with --left-only");
revs->cherry_mark = 1;
revs->right_only = 1;
revs->max_parents = 1;
revs->limited = 1;
} else if (!strcmp(arg, "--count")) {
revs->count = 1;
} else if (!strcmp(arg, "--cherry-mark")) {
if (revs->cherry_pick)
die("--cherry-mark is incompatible with --cherry-pick");
revs->cherry_mark = 1;
revs->limited = 1; /* needs limit_list() */
} else if (!strcmp(arg, "--cherry-pick")) {
if (revs->cherry_mark)
die("--cherry-pick is incompatible with --cherry-mark");
revs->cherry_pick = 1;
revs->limited = 1;
} else if (!strcmp(arg, "--objects")) {
revs->tag_objects = 1;
revs->tree_objects = 1;
revs->blob_objects = 1;
} else if (!strcmp(arg, "--objects-edge")) {
revs->tag_objects = 1;
revs->tree_objects = 1;
revs->blob_objects = 1;
revs->edge_hint = 1;
} else if (!strcmp(arg, "--objects-edge-aggressive")) {
revs->tag_objects = 1;
revs->tree_objects = 1;
revs->blob_objects = 1;
revs->edge_hint = 1;
revs->edge_hint_aggressive = 1;
} else if (!strcmp(arg, "--verify-objects")) {
revs->tag_objects = 1;
revs->tree_objects = 1;
revs->blob_objects = 1;
revs->verify_objects = 1;
} else if (!strcmp(arg, "--unpacked")) {
revs->unpacked = 1;
} else if (starts_with(arg, "--unpacked=")) {
die("--unpacked=<packfile> no longer supported.");
} else if (!strcmp(arg, "-r")) {
revs->diff = 1;
DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
} else if (!strcmp(arg, "-t")) {
revs->diff = 1;
DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
} else if (!strcmp(arg, "-m")) {
revs->ignore_merges = 0;
} else if (!strcmp(arg, "-c")) {
revs->diff = 1;
revs->dense_combined_merges = 0;
revs->combine_merges = 1;
} else if (!strcmp(arg, "--cc")) {
revs->diff = 1;
revs->dense_combined_merges = 1;
revs->combine_merges = 1;
} else if (!strcmp(arg, "-v")) {
revs->verbose_header = 1;
} else if (!strcmp(arg, "--pretty")) {
revs->verbose_header = 1;
revs->pretty_given = 1;
get_commit_format(NULL, revs);
} else if (starts_with(arg, "--pretty=") || starts_with(arg, "--format=")) {
/*
* Detached form ("--pretty X" as opposed to "--pretty=X")
* not allowed, since the argument is optional.
*/
revs->verbose_header = 1;
revs->pretty_given = 1;
get_commit_format(arg+9, revs);
} else if (!strcmp(arg, "--expand-tabs")) {
revs->expand_tabs_in_log = 8;
} else if (!strcmp(arg, "--no-expand-tabs")) {
revs->expand_tabs_in_log = 0;
} else if (skip_prefix(arg, "--expand-tabs=", &arg)) {
int val;
if (strtol_i(arg, 10, &val) < 0 || val < 0)
die("'%s': not a non-negative integer", arg);
revs->expand_tabs_in_log = val;
} else if (!strcmp(arg, "--show-notes") || !strcmp(arg, "--notes")) {
revs->show_notes = 1;
revs->show_notes_given = 1;
revs->notes_opt.use_default_notes = 1;
} else if (!strcmp(arg, "--show-signature")) {
revs->show_signature = 1;
} else if (!strcmp(arg, "--no-show-signature")) {
revs->show_signature = 0;
} else if (!strcmp(arg, "--show-linear-break") ||
starts_with(arg, "--show-linear-break=")) {
if (starts_with(arg, "--show-linear-break="))
revs->break_bar = xstrdup(arg + 20);
else
revs->break_bar = " ..........";
revs->track_linear = 1;
revs->track_first_time = 1;
} else if (starts_with(arg, "--show-notes=") ||
starts_with(arg, "--notes=")) {
struct strbuf buf = STRBUF_INIT;
revs->show_notes = 1;
revs->show_notes_given = 1;
if (starts_with(arg, "--show-notes")) {
if (revs->notes_opt.use_default_notes < 0)
revs->notes_opt.use_default_notes = 1;
strbuf_addstr(&buf, arg+13);
}
else
strbuf_addstr(&buf, arg+8);
expand_notes_ref(&buf);
string_list_append(&revs->notes_opt.extra_notes_refs,
strbuf_detach(&buf, NULL));
} else if (!strcmp(arg, "--no-notes")) {
revs->show_notes = 0;
revs->show_notes_given = 1;
revs->notes_opt.use_default_notes = -1;
/* we have been strdup'ing ourselves, so trick
* string_list into free()ing strings */
revs->notes_opt.extra_notes_refs.strdup_strings = 1;
string_list_clear(&revs->notes_opt.extra_notes_refs, 0);
revs->notes_opt.extra_notes_refs.strdup_strings = 0;
} else if (!strcmp(arg, "--standard-notes")) {
revs->show_notes_given = 1;
revs->notes_opt.use_default_notes = 1;
} else if (!strcmp(arg, "--no-standard-notes")) {
revs->notes_opt.use_default_notes = 0;
} else if (!strcmp(arg, "--oneline")) {
revs->verbose_header = 1;
get_commit_format("oneline", revs);
revs->pretty_given = 1;
revs->abbrev_commit = 1;
} else if (!strcmp(arg, "--graph")) {
revs->topo_order = 1;
revs->rewrite_parents = 1;
revs->graph = graph_init(revs);
} else if (!strcmp(arg, "--root")) {
revs->show_root_diff = 1;
} else if (!strcmp(arg, "--no-commit-id")) {
revs->no_commit_id = 1;
} else if (!strcmp(arg, "--always")) {
revs->always_show_header = 1;
} else if (!strcmp(arg, "--no-abbrev")) {
revs->abbrev = 0;
} else if (!strcmp(arg, "--abbrev")) {
revs->abbrev = DEFAULT_ABBREV;
} else if (starts_with(arg, "--abbrev=")) {
revs->abbrev = strtoul(arg + 9, NULL, 10);
if (revs->abbrev < MINIMUM_ABBREV)
revs->abbrev = MINIMUM_ABBREV;
else if (revs->abbrev > 40)
revs->abbrev = 40;
} else if (!strcmp(arg, "--abbrev-commit")) {
revs->abbrev_commit = 1;
revs->abbrev_commit_given = 1;
} else if (!strcmp(arg, "--no-abbrev-commit")) {
revs->abbrev_commit = 0;
} else if (!strcmp(arg, "--full-diff")) {
revs->diff = 1;
revs->full_diff = 1;
} else if (!strcmp(arg, "--full-history")) {
revs->simplify_history = 0;
} else if (!strcmp(arg, "--relative-date")) {
convert "enum date_mode" into a struct In preparation for adding date modes that may carry extra information beyond the mode itself, this patch converts the date_mode enum into a struct. Most of the conversion is fairly straightforward; we pass the struct as a pointer and dereference the type field where necessary. Locations that declare a date_mode can use a "{}" constructor. However, the tricky case is where we use the enum labels as constants, like: show_date(t, tz, DATE_NORMAL); Ideally we could say: show_date(t, tz, &{ DATE_NORMAL }); but of course C does not allow that. Likewise, we cannot cast the constant to a struct, because we need to pass an actual address. Our options are basically: 1. Manually add a "struct date_mode d = { DATE_NORMAL }" definition to each caller, and pass "&d". This makes the callers uglier, because they sometimes do not even have their own scope (e.g., they are inside a switch statement). 2. Provide a pre-made global "date_normal" struct that can be passed by address. We'd also need "date_rfc2822", "date_iso8601", and so forth. But at least the ugliness is defined in one place. 3. Provide a wrapper that generates the correct struct on the fly. The big downside is that we end up pointing to a single global, which makes our wrapper non-reentrant. But show_date is already not reentrant, so it does not matter. This patch implements 3, along with a minor macro to keep the size of the callers sane. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-26 00:55:02 +08:00
revs->date_mode.type = DATE_RELATIVE;
revs->date_mode_explicit = 1;
} else if ((argcount = parse_long_opt("date", argv, &optarg))) {
convert "enum date_mode" into a struct In preparation for adding date modes that may carry extra information beyond the mode itself, this patch converts the date_mode enum into a struct. Most of the conversion is fairly straightforward; we pass the struct as a pointer and dereference the type field where necessary. Locations that declare a date_mode can use a "{}" constructor. However, the tricky case is where we use the enum labels as constants, like: show_date(t, tz, DATE_NORMAL); Ideally we could say: show_date(t, tz, &{ DATE_NORMAL }); but of course C does not allow that. Likewise, we cannot cast the constant to a struct, because we need to pass an actual address. Our options are basically: 1. Manually add a "struct date_mode d = { DATE_NORMAL }" definition to each caller, and pass "&d". This makes the callers uglier, because they sometimes do not even have their own scope (e.g., they are inside a switch statement). 2. Provide a pre-made global "date_normal" struct that can be passed by address. We'd also need "date_rfc2822", "date_iso8601", and so forth. But at least the ugliness is defined in one place. 3. Provide a wrapper that generates the correct struct on the fly. The big downside is that we end up pointing to a single global, which makes our wrapper non-reentrant. But show_date is already not reentrant, so it does not matter. This patch implements 3, along with a minor macro to keep the size of the callers sane. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-06-26 00:55:02 +08:00
parse_date_format(optarg, &revs->date_mode);
revs->date_mode_explicit = 1;
return argcount;
} else if (!strcmp(arg, "--log-size")) {
revs->show_log_size = 1;
}
/*
* Grepping the commit log
*/
else if ((argcount = parse_long_opt("author", argv, &optarg))) {
add_header_grep(revs, GREP_HEADER_AUTHOR, optarg);
return argcount;
} else if ((argcount = parse_long_opt("committer", argv, &optarg))) {
add_header_grep(revs, GREP_HEADER_COMMITTER, optarg);
return argcount;
} else if ((argcount = parse_long_opt("grep-reflog", argv, &optarg))) {
add_header_grep(revs, GREP_HEADER_REFLOG, optarg);
return argcount;
} else if ((argcount = parse_long_opt("grep", argv, &optarg))) {
add_message_grep(revs, optarg);
return argcount;
} else if (!strcmp(arg, "--grep-debug")) {
revs->grep_filter.debug = 1;
} else if (!strcmp(arg, "--basic-regexp")) {
revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_BRE;
} else if (!strcmp(arg, "--extended-regexp") || !strcmp(arg, "-E")) {
revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_ERE;
} else if (!strcmp(arg, "--regexp-ignore-case") || !strcmp(arg, "-i")) {
revs->grep_filter.regflags |= REG_ICASE;
DIFF_OPT_SET(&revs->diffopt, PICKAXE_IGNORE_CASE);
} else if (!strcmp(arg, "--fixed-strings") || !strcmp(arg, "-F")) {
revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_FIXED;
} else if (!strcmp(arg, "--perl-regexp")) {
revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_PCRE;
} else if (!strcmp(arg, "--all-match")) {
revs->grep_filter.all_match = 1;
} else if (!strcmp(arg, "--invert-grep")) {
revs->invert_grep = 1;
} else if ((argcount = parse_long_opt("encoding", argv, &optarg))) {
if (strcmp(optarg, "none"))
git_log_output_encoding = xstrdup(optarg);
else
git_log_output_encoding = "";
return argcount;
} else if (!strcmp(arg, "--reverse")) {
revs->reverse ^= 1;
} else if (!strcmp(arg, "--children")) {
revs->children.name = "children";
revs->limited = 1;
} else if (!strcmp(arg, "--ignore-missing")) {
revs->ignore_missing = 1;
} else {
int opts = diff_opt_parse(&revs->diffopt, argv, argc, revs->prefix);
if (!opts)
unkv[(*unkc)++] = arg;
return opts;
}
if (revs->graph && revs->track_linear)
die("--show-linear-break and --graph are incompatible");
return 1;
}
void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
const struct option *options,
const char * const usagestr[])
{
int n = handle_revision_opt(revs, ctx->argc, ctx->argv,
&ctx->cpidx, ctx->out);
if (n <= 0) {
error("unknown option `%s'", ctx->argv[0]);
usage_with_options(usagestr, options);
}
ctx->argv += n;
ctx->argc -= n;
}
static int for_each_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data, const char *term) {
struct strbuf bisect_refs = STRBUF_INIT;
int status;
strbuf_addf(&bisect_refs, "refs/bisect/%s", term);
status = for_each_ref_in_submodule(submodule, bisect_refs.buf, fn, cb_data);
strbuf_release(&bisect_refs);
return status;
}
static int for_each_bad_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
{
return for_each_bisect_ref(submodule, fn, cb_data, term_bad);
}
static int for_each_good_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
{
return for_each_bisect_ref(submodule, fn, cb_data, term_good);
}
static int handle_revision_pseudo_opt(const char *submodule,
struct rev_info *revs,
int argc, const char **argv, int *flags)
{
const char *arg = argv[0];
const char *optarg;
int argcount;
/*
* NOTE!
*
* Commands like "git shortlog" will not accept the options below
* unless parse_revision_opt queues them (as opposed to erroring
* out).
*
* When implementing your new pseudo-option, remember to
* register it in the list at the top of handle_revision_opt.
*/
if (!strcmp(arg, "--all")) {
handle_refs(submodule, revs, *flags, for_each_ref_submodule);
handle_refs(submodule, revs, *flags, head_ref_submodule);
clear_ref_exclusion(&revs->ref_excludes);
} else if (!strcmp(arg, "--branches")) {
handle_refs(submodule, revs, *flags, for_each_branch_ref_submodule);
clear_ref_exclusion(&revs->ref_excludes);
} else if (!strcmp(arg, "--bisect")) {
read_bisect_terms(&term_bad, &term_good);
handle_refs(submodule, revs, *flags, for_each_bad_bisect_ref);
handle_refs(submodule, revs, *flags ^ (UNINTERESTING | BOTTOM), for_each_good_bisect_ref);
revs->bisect = 1;
} else if (!strcmp(arg, "--tags")) {
handle_refs(submodule, revs, *flags, for_each_tag_ref_submodule);
clear_ref_exclusion(&revs->ref_excludes);
} else if (!strcmp(arg, "--remotes")) {
handle_refs(submodule, revs, *flags, for_each_remote_ref_submodule);
clear_ref_exclusion(&revs->ref_excludes);
} else if ((argcount = parse_long_opt("glob", argv, &optarg))) {
struct all_refs_cb cb;
init_all_refs_cb(&cb, revs, *flags);
for_each_glob_ref(handle_one_ref, optarg, &cb);
clear_ref_exclusion(&revs->ref_excludes);
return argcount;
} else if ((argcount = parse_long_opt("exclude", argv, &optarg))) {
add_ref_exclusion(&revs->ref_excludes, optarg);
return argcount;
} else if (starts_with(arg, "--branches=")) {
struct all_refs_cb cb;
init_all_refs_cb(&cb, revs, *flags);
for_each_glob_ref_in(handle_one_ref, arg + 11, "refs/heads/", &cb);
clear_ref_exclusion(&revs->ref_excludes);
} else if (starts_with(arg, "--tags=")) {
struct all_refs_cb cb;
init_all_refs_cb(&cb, revs, *flags);
for_each_glob_ref_in(handle_one_ref, arg + 7, "refs/tags/", &cb);
clear_ref_exclusion(&revs->ref_excludes);
} else if (starts_with(arg, "--remotes=")) {
struct all_refs_cb cb;
init_all_refs_cb(&cb, revs, *flags);
for_each_glob_ref_in(handle_one_ref, arg + 10, "refs/remotes/", &cb);
clear_ref_exclusion(&revs->ref_excludes);
} else if (!strcmp(arg, "--reflog")) {
add_reflogs_to_pending(revs, *flags);
} else if (!strcmp(arg, "--indexed-objects")) {
add_index_objects_to_pending(revs, *flags);
} else if (!strcmp(arg, "--not")) {
*flags ^= UNINTERESTING | BOTTOM;
} else if (!strcmp(arg, "--no-walk")) {
revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
} else if (starts_with(arg, "--no-walk=")) {
/*
* Detached form ("--no-walk X" as opposed to "--no-walk=X")
* not allowed, since the argument is optional.
*/
if (!strcmp(arg + 10, "sorted"))
revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
else if (!strcmp(arg + 10, "unsorted"))
revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
else
return error("invalid argument to --no-walk");
} else if (!strcmp(arg, "--do-walk")) {
revs->no_walk = 0;
} else {
return 0;
}
return 1;
}
static void NORETURN diagnose_missing_default(const char *def)
{
unsigned char sha1[20];
int flags;
const char *refname;
refname = resolve_ref_unsafe(def, 0, sha1, &flags);
if (!refname || !(flags & REF_ISSYMREF) || (flags & REF_ISBROKEN))
die(_("your current branch appears to be broken"));
skip_prefix(refname, "refs/heads/", &refname);
die(_("your current branch '%s' does not have any commits yet"),
refname);
}
/*
* Parse revision information, filling in the "rev_info" structure,
* and removing the used arguments from the argument list.
*
* Returns the number of arguments left that weren't recognized
* (which are also moved to the head of the argument list)
*/
int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct setup_revision_opt *opt)
{
int i, flags, left, seen_dashdash, read_from_stdin, got_rev_arg = 0, revarg_opt;
struct cmdline_pathspec prune_data;
const char *submodule = NULL;
memset(&prune_data, 0, sizeof(prune_data));
if (opt)
submodule = opt->submodule;
/* First, search for "--" */
if (opt && opt->assume_dashdash) {
seen_dashdash = 1;
} else {
seen_dashdash = 0;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (strcmp(arg, "--"))
continue;
argv[i] = NULL;
argc = i;
if (argv[i + 1])
append_prune_data(&prune_data, argv + i + 1);
seen_dashdash = 1;
break;
}
}
/* Second, deal with arguments and options */
flags = 0;
revarg_opt = opt ? opt->revarg_opt : 0;
if (seen_dashdash)
revarg_opt |= REVARG_CANNOT_BE_FILENAME;
read_from_stdin = 0;
for (left = i = 1; i < argc; i++) {
const char *arg = argv[i];
if (*arg == '-') {
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
int opts;
opts = handle_revision_pseudo_opt(submodule,
revs, argc - i, argv + i,
&flags);
if (opts > 0) {
i += opts - 1;
continue;
}
if (!strcmp(arg, "--stdin")) {
if (revs->disable_stdin) {
argv[left++] = arg;
continue;
}
if (read_from_stdin++)
die("--stdin given twice?");
read_revisions_from_stdin(revs, &prune_data);
continue;
}
opts = handle_revision_opt(revs, argc - i, argv + i, &left, argv);
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
if (opts > 0) {
i += opts - 1;
continue;
}
if (opts < 0)
exit(128);
continue;
}
if (handle_revision_arg(arg, revs, flags, revarg_opt)) {
int j;
if (seen_dashdash || *arg == '^')
die("bad revision '%s'", arg);
/* If we didn't have a "--":
* (1) all filenames must exist;
* (2) all rev-args must not be interpretable
* as a valid filename.
* but the latter we have checked in the main loop.
*/
for (j = i; j < argc; j++)
verify_filename(revs->prefix, argv[j], j == i);
append_prune_data(&prune_data, argv + i);
break;
}
else
got_rev_arg = 1;
}
if (prune_data.nr) {
/*
* If we need to introduce the magic "a lone ':' means no
* pathspec whatsoever", here is the place to do so.
*
* if (prune_data.nr == 1 && !strcmp(prune_data[0], ":")) {
* prune_data.nr = 0;
* prune_data.alloc = 0;
* free(prune_data.path);
* prune_data.path = NULL;
* } else {
* terminate prune_data.alloc with NULL and
* call init_pathspec() to set revs->prune_data here.
* }
*/
ALLOC_GROW(prune_data.path, prune_data.nr + 1, prune_data.alloc);
prune_data.path[prune_data.nr++] = NULL;
parse_pathspec(&revs->prune_data, 0, 0,
revs->prefix, prune_data.path);
}
if (revs->def == NULL)
revs->def = opt ? opt->def : NULL;
if (opt && opt->tweak)
opt->tweak(revs, opt);
if (revs->show_merge)
prepare_show_merge(revs);
if (revs->def && !revs->pending.nr && !got_rev_arg) {
struct object_id oid;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
struct object *object;
struct object_context oc;
if (get_sha1_with_context(revs->def, 0, oid.hash, &oc))
diagnose_missing_default(revs->def);
object = get_reference(revs, revs->def, &oid, 0);
add_pending_object_with_mode(revs, object, revs->def, oc.mode);
}
/* Did the user ask for any diff output? Run the diff! */
if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
revs->diff = 1;
/* Pickaxe, diff-filter and rename following need diffs */
if (revs->diffopt.pickaxe ||
revs->diffopt.filter ||
DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
revs->diff = 1;
if (revs->topo_order)
revs->limited = 1;
if (revs->prune_data.nr) {
copy_pathspec(&revs->pruning.pathspec, &revs->prune_data);
Finally implement "git log --follow" Ok, I've really held off doing this too damn long, because I'm lazy, and I was always hoping that somebody else would do it. But no, people keep asking for it, but nobody actually did anything, so I decided I might as well bite the bullet, and instead of telling people they could add a "--follow" flag to "git log" to do what they want to do, I decided that it looks like I just have to do it for them.. The code wasn't actually that complicated, in that the diffstat for this patch literally says "70 insertions(+), 1 deletions(-)", but I will have to admit that in order to get to this fairly simple patch, you did have to know and understand the internal git diff generation machinery pretty well, and had to really be able to follow how commit generation interacts with generating patches and generating the log. So I suspect that while I was right that it wasn't that hard, I might have been expecting too much of random people - this patch does seem to be firmly in the core "Linus or Junio" territory. To make a long story short: I'm sorry for it taking so long until I just did it. I'm not going to guarantee that this works for everybody, but you really can just look at the patch, and after the appropriate appreciative noises ("Ooh, aah") over how clever I am, you can then just notice that the code itself isn't really that complicated. All the real new code is in the new "try_to_follow_renames()" function. It really isn't rocket science: we notice that the pathname we were looking at went away, so we start a full tree diff and try to see if we can instead make that pathname be a rename or a copy from some other previous pathname. And if we can, we just continue, except we show *that* particular diff, and ever after we use the _previous_ pathname. One thing to look out for: the "rename detection" is considered to be a singular event in the _linear_ "git log" output! That's what people want to do, but I just wanted to point out that this patch is *not* carrying around a "commit,pathname" kind of pair and it's *not* going to be able to notice the file coming from multiple *different* files in earlier history. IOW, if you use "git log --follow", then you get the stupid CVS/SVN kind of "files have single identities" kind of semantics, and git log will just pick the identity based on the normal move/copy heuristics _as_if_ the history could be linearized. Put another way: I think the model is broken, but given the broken model, I think this patch does just about as well as you can do. If you have merges with the same "file" having different filenames over the two branches, git will just end up picking _one_ of the pathnames at the point where the newer one goes away. It never looks at multiple pathnames in parallel. And if you understood all that, you probably didn't need it explained, and if you didn't understand the above blathering, it doesn't really mtter to you. What matters to you is that you can now do git log -p --follow builtin-rev-list.c and it will find the point where the old "rev-list.c" got renamed to "builtin-rev-list.c" and show it as such. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-06-20 05:22:46 +08:00
/* Can't prune commits with rename following: the paths change.. */
if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
revs->prune = 1;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
if (!revs->full_diff)
copy_pathspec(&revs->diffopt.pathspec,
&revs->prune_data);
}
if (revs->combine_merges)
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
revs->ignore_merges = 0;
revs->diffopt.abbrev = revs->abbrev;
Implement line-history search (git log -L) This is a rewrite of much of Bo's work, mainly in an effort to split it into smaller, easier to understand routines. The algorithm is built around the struct range_set, which encodes a series of line ranges as intervals [a,b). This is used in two contexts: * A set of lines we are tracking (which will change as we dig through history). * To encode diffs, as pairs of ranges. The main routine is range_set_map_across_diff(). It processes the diff between a commit C and some parent P. It determines which diff hunks are relevant to the ranges tracked in C, and computes the new ranges for P. The algorithm is then simply to process history in topological order from newest to oldest, computing ranges and (partial) diffs. At branch points, we need to merge the ranges we are watching. We will find that many commits do not affect the chosen ranges, and mark them TREESAME (in addition to those already filtered by pathspec limiting). Another pass of history simplification then gets rid of such commits. This is wired as an extra filtering pass in the log machinery. This currently only reduces code duplication, but should allow for other simplifications and options to be used. Finally, we hook a diff printer into the output chain. Ideally we would wire directly into the diff logic, to optionally use features like word diff. However, that will require some major reworking of the diff chain, so we completely replace the output with our own diff for now. As this was a GSoC project, and has quite some history by now, many people have helped. In no particular order, thanks go to Jakub Narebski <jnareb@gmail.com> Jens Lehmann <Jens.Lehmann@web.de> Jonathan Nieder <jrnieder@gmail.com> Junio C Hamano <gitster@pobox.com> Ramsay Jones <ramsay@ramsay1.demon.co.uk> Will Palmer <wmpalmer@gmail.com> Apologies to everyone I forgot. Signed-off-by: Bo Yang <struggleyb.nku@gmail.com> Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-03-29 00:47:32 +08:00
if (revs->line_level_traverse) {
revs->limited = 1;
revs->topo_order = 1;
}
diff_setup_done(&revs->diffopt);
grep_commit_pattern_type(GREP_PATTERN_TYPE_UNSPECIFIED,
&revs->grep_filter);
compile_grep_patterns(&revs->grep_filter);
if (revs->reverse && revs->reflog_info)
die("cannot combine --reverse with --walk-reflogs");
if (revs->rewrite_parents && revs->children.name)
die("cannot combine --parents and --children");
/*
* Limitations on the graph functionality
*/
if (revs->reverse && revs->graph)
die("cannot combine --reverse with --graph");
if (revs->reflog_info && revs->graph)
die("cannot combine --walk-reflogs with --graph");
if (revs->no_walk && revs->graph)
die("cannot combine --no-walk with --graph");
if (!revs->reflog_info && revs->grep_filter.use_reflog_filter)
die("cannot use --grep-reflog without --walk-reflogs");
if (revs->first_parent_only && revs->bisect)
die(_("--first-parent is incompatible with --bisect"));
if (revs->expand_tabs_in_log < 0)
revs->expand_tabs_in_log = revs->expand_tabs_in_log_default;
return left;
}
static void add_child(struct rev_info *revs, struct commit *parent, struct commit *child)
{
struct commit_list *l = xcalloc(1, sizeof(*l));
l->item = child;
l->next = add_decoration(&revs->children, &parent->object, l);
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
static int remove_duplicate_parents(struct rev_info *revs, struct commit *commit)
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
{
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
struct treesame_state *ts = lookup_decoration(&revs->treesame, &commit->object);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
struct commit_list **pp, *p;
int surviving_parents;
/* Examine existing parents while marking ones we have seen... */
pp = &commit->parents;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
surviving_parents = 0;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
while ((p = *pp) != NULL) {
struct commit *parent = p->item;
if (parent->object.flags & TMP_MARK) {
*pp = p->next;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
if (ts)
compact_treesame(revs, commit, surviving_parents);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
continue;
}
parent->object.flags |= TMP_MARK;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
surviving_parents++;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
pp = &p->next;
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
/* clear the temporary mark */
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
for (p = commit->parents; p; p = p->next) {
p->item->object.flags &= ~TMP_MARK;
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
/* no update_treesame() - removing duplicates can't affect TREESAME */
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
return surviving_parents;
}
struct merge_simplify_state {
struct commit *simplified;
};
static struct merge_simplify_state *locate_simplify_state(struct rev_info *revs, struct commit *commit)
{
struct merge_simplify_state *st;
st = lookup_decoration(&revs->merge_simplification, &commit->object);
if (!st) {
st = xcalloc(1, sizeof(*st));
add_decoration(&revs->merge_simplification, &commit->object, st);
}
return st;
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
static int mark_redundant_parents(struct rev_info *revs, struct commit *commit)
{
struct commit_list *h = reduce_heads(commit->parents);
int i = 0, marked = 0;
struct commit_list *po, *pn;
/* Want these for sanity-checking only */
int orig_cnt = commit_list_count(commit->parents);
int cnt = commit_list_count(h);
/*
* Not ready to remove items yet, just mark them for now, based
* on the output of reduce_heads(). reduce_heads outputs the reduced
* set in its original order, so this isn't too hard.
*/
po = commit->parents;
pn = h;
while (po) {
if (pn && po->item == pn->item) {
pn = pn->next;
i++;
} else {
po->item->object.flags |= TMP_MARK;
marked++;
}
po=po->next;
}
if (i != cnt || cnt+marked != orig_cnt)
die("mark_redundant_parents %d %d %d %d", orig_cnt, cnt, i, marked);
free_commit_list(h);
return marked;
}
static int mark_treesame_root_parents(struct rev_info *revs, struct commit *commit)
{
struct commit_list *p;
int marked = 0;
for (p = commit->parents; p; p = p->next) {
struct commit *parent = p->item;
if (!parent->parents && (parent->object.flags & TREESAME)) {
parent->object.flags |= TMP_MARK;
marked++;
}
}
return marked;
}
/*
* Awkward naming - this means one parent we are TREESAME to.
* cf mark_treesame_root_parents: root parents that are TREESAME (to an
* empty tree). Better name suggestions?
*/
static int leave_one_treesame_to_parent(struct rev_info *revs, struct commit *commit)
{
struct treesame_state *ts = lookup_decoration(&revs->treesame, &commit->object);
struct commit *unmarked = NULL, *marked = NULL;
struct commit_list *p;
unsigned n;
for (p = commit->parents, n = 0; p; p = p->next, n++) {
if (ts->treesame[n]) {
if (p->item->object.flags & TMP_MARK) {
if (!marked)
marked = p->item;
} else {
if (!unmarked) {
unmarked = p->item;
break;
}
}
}
}
/*
* If we are TREESAME to a marked-for-deletion parent, but not to any
* unmarked parents, unmark the first TREESAME parent. This is the
* parent that the default simplify_history==1 scan would have followed,
* and it doesn't make sense to omit that path when asking for a
* simplified full history. Retaining it improves the chances of
* understanding odd missed merges that took an old version of a file.
*
* Example:
*
* I--------*X A modified the file, but mainline merge X used
* \ / "-s ours", so took the version from I. X is
* `-*A--' TREESAME to I and !TREESAME to A.
*
* Default log from X would produce "I". Without this check,
* --full-history --simplify-merges would produce "I-A-X", showing
* the merge commit X and that it changed A, but not making clear that
* it had just taken the I version. With this check, the topology above
* is retained.
*
* Note that it is possible that the simplification chooses a different
* TREESAME parent from the default, in which case this test doesn't
* activate, and we _do_ drop the default parent. Example:
*
* I------X A modified the file, but it was reverted in B,
* \ / meaning mainline merge X is TREESAME to both
* *A-*B parents.
*
* Default log would produce "I" by following the first parent;
* --full-history --simplify-merges will produce "I-A-B". But this is a
* reasonable result - it presents a logical full history leading from
* I to X, and X is not an important merge.
*/
if (!unmarked && marked) {
marked->object.flags &= ~TMP_MARK;
return 1;
}
return 0;
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
static int remove_marked_parents(struct rev_info *revs, struct commit *commit)
{
struct commit_list **pp, *p;
int nth_parent, removed = 0;
pp = &commit->parents;
nth_parent = 0;
while ((p = *pp) != NULL) {
struct commit *parent = p->item;
if (parent->object.flags & TMP_MARK) {
parent->object.flags &= ~TMP_MARK;
*pp = p->next;
free(p);
removed++;
compact_treesame(revs, commit, nth_parent);
continue;
}
pp = &p->next;
nth_parent++;
}
/* Removing parents can only increase TREESAMEness */
if (removed && !(commit->object.flags & TREESAME))
update_treesame(revs, commit);
return nth_parent;
}
static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
{
struct commit_list *p;
struct commit *parent;
struct merge_simplify_state *st, *pst;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
int cnt;
st = locate_simplify_state(revs, commit);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
/*
* Have we handled this one?
*/
if (st->simplified)
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
return tail;
/*
* An UNINTERESTING commit simplifies to itself, so does a
* root commit. We do not rewrite parents of such commit
* anyway.
*/
if ((commit->object.flags & UNINTERESTING) || !commit->parents) {
st->simplified = commit;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
return tail;
}
/*
* Do we know what commit all of our parents that matter
* should be rewritten to? Otherwise we are not ready to
* rewrite this one yet.
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
*/
for (cnt = 0, p = commit->parents; p; p = p->next) {
pst = locate_simplify_state(revs, p->item);
if (!pst->simplified) {
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
tail = &commit_list_insert(p->item, tail)->next;
cnt++;
}
if (revs->first_parent_only)
break;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
}
if (cnt) {
tail = &commit_list_insert(commit, tail)->next;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
return tail;
}
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
/*
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
* Rewrite our list of parents. Note that this cannot
* affect our TREESAME flags in any way - a commit is
* always TREESAME to its simplification.
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
*/
for (p = commit->parents; p; p = p->next) {
pst = locate_simplify_state(revs, p->item);
p->item = pst->simplified;
if (revs->first_parent_only)
break;
}
if (revs->first_parent_only)
cnt = 1;
else
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
cnt = remove_duplicate_parents(revs, commit);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
/*
* It is possible that we are a merge and one side branch
* does not have any commit that touches the given paths;
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
* in such a case, the immediate parent from that branch
* will be rewritten to be the merge base.
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
*
* o----X X: the commit we are looking at;
* / / o: a commit that touches the paths;
* ---o----'
*
* Further, a merge of an independent branch that doesn't
* touch the path will reduce to a treesame root parent:
*
* ----o----X X: the commit we are looking at;
* / o: a commit that touches the paths;
* r r: a root commit not touching the paths
*
* Detect and simplify both cases.
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
*/
if (1 < cnt) {
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
int marked = mark_redundant_parents(revs, commit);
marked += mark_treesame_root_parents(revs, commit);
if (marked)
marked -= leave_one_treesame_to_parent(revs, commit);
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
if (marked)
cnt = remove_marked_parents(revs, commit);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
}
/*
* A commit simplifies to itself if it is a root, if it is
* UNINTERESTING, if it touches the given paths, or if it is a
* merge and its parents don't simplify to one relevant commit
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
* (the first two cases are already handled at the beginning of
* this function).
*
* Otherwise, it simplifies to what its sole relevant parent
* simplifies to.
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
*/
if (!cnt ||
(commit->object.flags & UNINTERESTING) ||
!(commit->object.flags & TREESAME) ||
(parent = one_relevant_parent(revs, commit->parents)) == NULL)
st->simplified = commit;
else {
pst = locate_simplify_state(revs, parent);
st->simplified = pst->simplified;
}
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
return tail;
}
static void simplify_merges(struct rev_info *revs)
{
struct commit_list *list, *next;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
struct commit_list *yet_to_do, **tail;
struct commit *commit;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
if (!revs->prune)
return;
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
/* feed the list reversed */
yet_to_do = NULL;
for (list = revs->commits; list; list = next) {
commit = list->item;
next = list->next;
/*
* Do not free(list) here yet; the original list
* is used later in this function.
*/
commit_list_insert(commit, &yet_to_do);
}
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
while (yet_to_do) {
list = yet_to_do;
yet_to_do = NULL;
tail = &yet_to_do;
while (list) {
commit = pop_commit(&list);
tail = simplify_one(revs, commit, tail);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
}
}
/* clean up the result, removing the simplified ones */
list = revs->commits;
revs->commits = NULL;
tail = &revs->commits;
while (list) {
struct merge_simplify_state *st;
commit = pop_commit(&list);
st = locate_simplify_state(revs, commit);
if (st->simplified == commit)
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
tail = &commit_list_insert(commit, tail)->next;
}
}
static void set_children(struct rev_info *revs)
{
struct commit_list *l;
for (l = revs->commits; l; l = l->next) {
struct commit *commit = l->item;
struct commit_list *p;
for (p = commit->parents; p; p = p->next)
add_child(revs, p->item, commit);
}
}
void reset_revision_walk(void)
{
clear_object_flags(SEEN | ADDED | SHOWN);
}
int prepare_revision_walk(struct rev_info *revs)
{
int i;
struct object_array old_pending;
struct commit_list **next = &revs->commits;
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
memcpy(&old_pending, &revs->pending, sizeof(old_pending));
Add "named object array" concept We've had this notion of a "object_list" for a long time, which eventually grew a "name" member because some users (notably git-rev-list) wanted to name each object as it is generated. That object_list is great for some things, but it isn't all that wonderful for others, and the "name" member is generally not used by everybody. This patch splits the users of the object_list array up into two: the traditional list users, who want the list-like format, and who don't actually use or want the name. And another class of users that really used the list as an extensible array, and generally wanted to name the objects. The patch is fairly straightforward, but it's also biggish. Most of it really just cleans things up: switching the revision parsing and listing over to the array makes things like the builtin-diff usage much simpler (we now see exactly how many members the array has, and we don't get the objects reversed from the order they were on the command line). One of the main reasons for doing this at all is that the malloc overhead of the simple object list was actually pretty high, and the array is just a lot denser. So this patch brings down memory usage by git-rev-list by just under 3% (on top of all the other memory use optimizations) on the mozilla archive. It does add more lines than it removes, and more importantly, it adds a whole new infrastructure for maintaining lists of objects, but on the other hand, the new dynamic array code is pretty obvious. The change to builtin-diff-tree.c shows a fairly good example of why an array interface is sometimes more natural, and just much simpler for everybody. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-06-20 08:42:35 +08:00
revs->pending.nr = 0;
revs->pending.alloc = 0;
revs->pending.objects = NULL;
for (i = 0; i < old_pending.nr; i++) {
struct object_array_entry *e = old_pending.objects + i;
traverse_commit_list: support pending blobs/trees with paths When we call traverse_commit_list, we may have trees and blobs in the pending array. As we process these, we pass the "name" field from the pending entry as the path of the object within the tree (which then becomes the root path if we recurse into subtrees). When we set up the traversal in prepare_revision_walk, though, the "name" field of any pending trees and blobs is likely to be the ref at which we found the object. We would not want to make this part of the path (e.g., doing so would make "git rev-list --objects v2.6.11-tree" in linux.git show paths like "v2.6.11-tree/Makefile", which is nonsensical). Therefore prepare_revision_walk sets the name field of each pending tree and blobs to the empty string. However, this leaves no room for a caller who does know the correct path of a pending object to propagate that information to the revision walker. We can fix this by making two related changes: 1. Use the "path" field as the path instead of the "name" field in traverse_commit_list. If the path is not set, default to "" (which is what we always ended up with in the current code, because of prepare_revision_walk). 2. In prepare_revision_walk, make a complete copy of the entry. This makes the path field available to the walker (if there is one), solving our problem. Leaving the name field intact is now OK, as we do not use it as a path due to point (1) above (and we can use it to make more meaningful error messages if we want). We also make the original "mode" field available to the walker, though it does not actually use it. Note that we still re-add the pending objects and free the old ones (so we may strdup the path and name only to free the old ones). This could be made more efficient by simply copying the object_array entries that we are keeping. However, that would require more restructuring of the code, and is not done here. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-10-16 06:43:19 +08:00
struct commit *commit = handle_commit(revs, e);
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
if (commit) {
if (!(commit->object.flags & SEEN)) {
commit->object.flags |= SEEN;
next = commit_list_append(commit, next);
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
}
}
}
if (!revs->leak_pending)
object_array_clear(&old_pending);
Common option parsing for "git log --diff" and friends This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-04-15 07:52:13 +08:00
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
/* Signal whether we need per-parent treesame decoration */
if (revs->simplify_merges ||
(revs->limited && limiting_can_increase_treesame(revs)))
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
revs->treesame.name = "treesame";
if (revs->no_walk != REVISION_WALK_NO_WALK_UNSORTED)
commit_list_sort_by_date(&revs->commits);
if (revs->no_walk)
return 0;
if (revs->limited)
if (limit_list(revs) < 0)
return -1;
if (revs->topo_order)
toposort: rename "lifo" field The primary invariant of sort_in_topological_order() is that a parent commit is not emitted until all children of it are. When traversing a forked history like this with "git log C E": A----B----C \ D----E we ensure that A is emitted after all of B, C, D, and E are done, B has to wait until C is done, and D has to wait until E is done. In some applications, however, we would further want to control how these child commits B, C, D and E on two parallel ancestry chains are shown. Most of the time, we would want to see C and B emitted together, and then E and D, and finally A (i.e. the --topo-order output). The "lifo" parameter of the sort_in_topological_order() function is used to control this behaviour. We start the traversal by knowing two commits, C and E. While keeping in mind that we also need to inspect E later, we pick C first to inspect, and we notice and record that B needs to be inspected. By structuring the "work to be done" set as a LIFO stack, we ensure that B is inspected next, before other in-flight commits we had known that we will need to inspect, e.g. E. When showing in --date-order, we would want to see commits ordered by timestamps, i.e. show C, E, B and D in this order before showing A, possibly mixing commits from two parallel histories together. When "lifo" parameter is set to false, the function keeps the "work to be done" set sorted in the date order to realize this semantics. After inspecting C, we add B to the "work to be done" set, but the next commit we inspect from the set is E which is newer than B. The name "lifo", however, is too strongly tied to the way how the function implements its behaviour, and does not describe what the behaviour _means_. Replace this field with an enum rev_sort_order, with two possible values: REV_SORT_IN_GRAPH_ORDER and REV_SORT_BY_COMMIT_DATE, and update the existing code. The mechanical replacement rule is: "lifo == 0" is equivalent to "sort_order == REV_SORT_BY_COMMIT_DATE" "lifo == 1" is equivalent to "sort_order == REV_SORT_IN_GRAPH_ORDER" Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-07 07:07:14 +08:00
sort_in_topological_order(&revs->commits, revs->sort_order);
Implement line-history search (git log -L) This is a rewrite of much of Bo's work, mainly in an effort to split it into smaller, easier to understand routines. The algorithm is built around the struct range_set, which encodes a series of line ranges as intervals [a,b). This is used in two contexts: * A set of lines we are tracking (which will change as we dig through history). * To encode diffs, as pairs of ranges. The main routine is range_set_map_across_diff(). It processes the diff between a commit C and some parent P. It determines which diff hunks are relevant to the ranges tracked in C, and computes the new ranges for P. The algorithm is then simply to process history in topological order from newest to oldest, computing ranges and (partial) diffs. At branch points, we need to merge the ranges we are watching. We will find that many commits do not affect the chosen ranges, and mark them TREESAME (in addition to those already filtered by pathspec limiting). Another pass of history simplification then gets rid of such commits. This is wired as an extra filtering pass in the log machinery. This currently only reduces code duplication, but should allow for other simplifications and options to be used. Finally, we hook a diff printer into the output chain. Ideally we would wire directly into the diff logic, to optionally use features like word diff. However, that will require some major reworking of the diff chain, so we completely replace the output with our own diff for now. As this was a GSoC project, and has quite some history by now, many people have helped. In no particular order, thanks go to Jakub Narebski <jnareb@gmail.com> Jens Lehmann <Jens.Lehmann@web.de> Jonathan Nieder <jrnieder@gmail.com> Junio C Hamano <gitster@pobox.com> Ramsay Jones <ramsay@ramsay1.demon.co.uk> Will Palmer <wmpalmer@gmail.com> Apologies to everyone I forgot. Signed-off-by: Bo Yang <struggleyb.nku@gmail.com> Signed-off-by: Thomas Rast <trast@student.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-03-29 00:47:32 +08:00
if (revs->line_level_traverse)
line_log_filter(revs);
revision traversal: show full history with merge simplification The --full-history traversal keeps all merges in addition to non-merge commits that touch paths in the given pathspec. This is useful to view both sides of a merge in a topology like this: A---M---o / / ---O---B even when A and B makes identical change to the given paths. The revision traversal without --full-history aims to come up with the simplest history to explain the final state of the tree, and one of the side branches can be pruned away. The behaviour to keep all merges however is inconvenient if neither A nor B touches the paths we are interested in. --full-history reduces the topology to: ---O---M---o in such a case, without removing M. This adds a post processing phase on top of --full-history traversal to remove needless merges from the resulting history. The idea is to compute, for each commit in the "full history" result set, the commit that should replace it in the simplified history. The commit to replace it in the final history is determined as follows: * In any case, we first figure out the replacement commits of parents of the commit we are looking at. The commit we are looking at is rewritten as if the replacement commits of its original parents are its parents. While doing so, we reduce the redundant parents from the rewritten parent list by not just removing the identical ones, but also removing a parent that is an ancestor of another parent. * After the above parent simplification, if the commit is a root commit, an UNINTERESTING commit, a merge commit, or modifies the paths we are interested in, then the replacement commit of the commit is itself. In other words, such a commit is not dropped from the final result. The first point above essentially means that the history is rewritten in the bottom up direction. We can rewrite the parent list of a commit only after we know how all of its parents are rewritten. This means that the processing needs to happen on the full history (i.e. after limit_list()). Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-31 16:17:41 +08:00
if (revs->simplify_merges)
simplify_merges(revs);
if (revs->children.name)
set_children(revs);
return 0;
}
static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
{
struct commit_list *cache = NULL;
for (;;) {
struct commit *p = *pp;
if (!revs->limited)
if (add_parents_to_list(revs, p, &revs->commits, &cache) < 0)
return rewrite_one_error;
if (p->object.flags & UNINTERESTING)
return rewrite_one_ok;
if (!(p->object.flags & TREESAME))
return rewrite_one_ok;
if (!p->parents)
return rewrite_one_noparents;
if ((p = one_relevant_parent(revs, p->parents)) == NULL)
return rewrite_one_ok;
*pp = p;
}
}
int rewrite_parents(struct rev_info *revs, struct commit *commit,
rewrite_parent_fn_t rewrite_parent)
{
struct commit_list **pp = &commit->parents;
while (*pp) {
struct commit_list *parent = *pp;
switch (rewrite_parent(revs, &parent->item)) {
case rewrite_one_ok:
break;
case rewrite_one_noparents:
*pp = parent->next;
continue;
case rewrite_one_error:
return -1;
}
pp = &parent->next;
}
revision.c: Make --full-history consider more merges History simplification previously always treated merges as TREESAME if they were TREESAME to any parent. While this was consistent with the default behaviour, this could be extremely unhelpful when searching detailed history, and could not be overridden. For example, if a merge had ignored a change, as if by "-s ours", then: git log -m -p --full-history -Schange file would successfully locate "change"'s addition but would not locate the merge that resolved against it. Futher, simplify_merges could drop the actual parent that a commit was TREESAME to, leaving it as a normal commit marked TREESAME that isn't actually TREESAME to its remaining parent. Now redefine a commit's TREESAME flag to be true only if a commit is TREESAME to _all_ of its parents. This doesn't affect either the default simplify_history behaviour (because partially TREESAME merges are turned into normal commits), or full-history with parent rewriting (because all merges are output). But it does affect other modes. The clearest difference is that --full-history will show more merges - sufficient to ensure that -m -p --full-history log searches can really explain every change to the file, including those changes' ultimate fate in merges. Also modify simplify_merges to recalculate TREESAME after removing a parent. This is achieved by storing per-parent TREESAME flags on the initial scan, so the combined flag can be easily recomputed. This fixes some t6111 failures, but creates a couple of new ones - we are now showing some merges that don't need to be shown. Signed-off-by: Kevin Bracey <kevin@bracey.fi> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-05-16 23:32:34 +08:00
remove_duplicate_parents(revs, commit);
return 0;
}
static int commit_rewrite_person(struct strbuf *buf, const char *what, struct string_list *mailmap)
{
char *person, *endp;
size_t len, namelen, maillen;
const char *name;
const char *mail;
struct ident_split ident;
person = strstr(buf->buf, what);
if (!person)
return 0;
person += strlen(what);
endp = strchr(person, '\n');
if (!endp)
return 0;
len = endp - person;
if (split_ident_line(&ident, person, len))
return 0;
mail = ident.mail_begin;
maillen = ident.mail_end - ident.mail_begin;
name = ident.name_begin;
namelen = ident.name_end - ident.name_begin;
if (map_user(mailmap, &mail, &maillen, &name, &namelen)) {
struct strbuf namemail = STRBUF_INIT;
strbuf_addf(&namemail, "%.*s <%.*s>",
(int)namelen, name, (int)maillen, mail);
strbuf_splice(buf, ident.name_begin - buf->buf,
ident.mail_end - ident.name_begin + 1,
namemail.buf, namemail.len);
strbuf_release(&namemail);
return 1;
}
return 0;
}
static int commit_match(struct commit *commit, struct rev_info *opt)
{
int retval;
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
const char *encoding;
const char *message;
struct strbuf buf = STRBUF_INIT;
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
if (!opt->grep_filter.pattern_list && !opt->grep_filter.header_list)
return 1;
/* Prepend "fake" headers as needed */
if (opt->grep_filter.use_reflog_filter) {
strbuf_addstr(&buf, "reflog ");
get_reflog_message(&buf, opt->reflog_info);
strbuf_addch(&buf, '\n');
}
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
/*
* We grep in the user's output encoding, under the assumption that it
* is the encoding they are most likely to write their grep pattern
* for. In addition, it means we will match the "notes" encoding below,
* so we will not end up with a buffer that has two different encodings
* in it.
*/
encoding = get_log_output_encoding();
message = logmsg_reencode(commit, NULL, encoding);
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
/* Copy the commit to temporary if we are using "fake" headers */
if (buf.len)
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
strbuf_addstr(&buf, message);
log --use-mailmap: optimize for cases without --author/--committer search When we taught the commit_match() mechanism to pay attention to the new --use-mailmap option, we started to unconditionally copy the commit object to a temporary buffer, just in case we need the author and committer lines updated via the mailmap mechanism, and rewrite author and committer using the mailmap. It turns out that this has a rather unpleasant performance implications. In the linux kernel repository, running $ git log --author='Junio C Hamano' --pretty=short >/dev/null under /usr/bin/time, with and without --use-mailmap (the .mailmap file is 118 entries long, the particular author does not appear in it), cost (with warm cache): [without --use-mailmap] 5.42user 0.26system 0:05.70elapsed 99%CPU (0avgtext+0avgdata 2005936maxresident)k 0inputs+0outputs (0major+137669minor)pagefaults 0swaps [with --use-mailmap] 6.47user 0.30system 0:06.78elapsed 99%CPU (0avgtext+0avgdata 2006288maxresident)k 0inputs+0outputs (0major+137692minor)pagefaults 0swaps which incurs about 20% overhead. The command is doing extra work, so the extra cost may be justified. But it is inexcusable to pay the cost when we do not need author/committer match. In the same repository, $ git log --grep='fix menuconfig on debian lenny' --pretty=short >/dev/null shows very similar numbers as the above: [without --use-mailmap] 5.32user 0.30system 0:05.63elapsed 99%CPU (0avgtext+0avgdata 2005984maxresident)k 0inputs+0outputs (0major+137672minor)pagefaults 0swaps [with --use-mailmap] 6.64user 0.24system 0:06.89elapsed 99%CPU (0avgtext+0avgdata 2006320maxresident)k 0inputs+0outputs (0major+137694minor)pagefaults 0swaps The latter case is an unnecessary performance regression. We may want to _show_ the result with mailmap applied, but we do not have to copy and rewrite the author/committer of all commits we try to match if we do not query for these fields. Trivially optimize this performace regression by limiting the rewrites for only when we are matching with author/committer fields. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-01-08 16:02:49 +08:00
if (opt->grep_filter.header_list && opt->mailmap) {
if (!buf.len)
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
strbuf_addstr(&buf, message);
commit_rewrite_person(&buf, "\nauthor ", opt->mailmap);
commit_rewrite_person(&buf, "\ncommitter ", opt->mailmap);
}
/* Append "fake" message parts as needed */
if (opt->show_notes) {
if (!buf.len)
log: re-encode commit messages before grepping If you run "git log --grep=foo", we will run your regex on the literal bytes of the commit message. This can provide confusing results if the commit message is not in the same encoding as your grep expression (or worse, you have commits in multiple encodings, in which case your regex would need to be written to match either encoding). On top of this, we might also be grepping in the commit's notes, which are already re-encoded, potentially leading to grepping in a buffer with mixed encodings concatenated. This is insanity, but most people never noticed, because their terminal and their commit encodings all match. Instead, let's massage the to-be-grepped commit into a standardized encoding. There is not much point in adding a flag for "this is the encoding I expect my grep pattern to match"; the only sane choice is for it to use the log output encoding. That is presumably what the user's terminal is using, and it means that the patterns found by the grep will match the output produced by git. As a bonus, this fixes a potential segfault in commit_match when commit->buffer is NULL, as we now build on logmsg_reencode, which handles reading the commit buffer from disk if necessary. The segfault can be triggered with: git commit -m 'text1' --allow-empty git commit -m 'text2' --allow-empty git log --graph --no-walk --grep 'text2' which arguably does not make any sense (--graph inherently wants a connected history, and by --no-walk the command line is telling us to show discrete points in history without connectivity), and we probably should forbid the combination, but that is a separate issue. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-12 04:59:58 +08:00
strbuf_addstr(&buf, message);
format_display_notes(commit->object.oid.hash, &buf, encoding, 1);
}
/*
* Find either in the original commit message, or in the temporary.
* Note that we cast away the constness of "message" here. It is
* const because it may come from the cached commit buffer. That's OK,
* because we know that it is modifiable heap memory, and that while
* grep_buffer may modify it for speed, it will restore any
* changes before returning.
*/
if (buf.len)
retval = grep_buffer(&opt->grep_filter, buf.buf, buf.len);
else
retval = grep_buffer(&opt->grep_filter,
(char *)message, strlen(message));
strbuf_release(&buf);
unuse_commit_buffer(commit, message);
return opt->invert_grep ? !retval : retval;
}
log: use true parents for diff even when rewriting When using pathspec filtering in combination with diff-based log output, parent simplification happens before the diff is computed. The diff is therefore against the *simplified* parents. This works okay, arguably by accident, in the normal case: simplification reduces to one parent as long as the commit is TREESAME to it. So the simplified parent of any given commit must have the same tree contents on the filtered paths as its true (unfiltered) parent. However, --full-diff breaks this guarantee, and indeed gives pretty spectacular results when comparing the output of git log --graph --stat ... git log --graph --full-diff --stat ... (--graph internally kicks in parent simplification, much like --parents). To fix it, store a copy of the parent list before simplification (in a slab) whenever --full-diff is in effect. Then use the stored parents instead of the simplified ones in the commit display code paths. The latter do not actually check for --full-diff to avoid duplicated code; they just grab the original parents if save_parents() has not been called for this revision walk. For ordinary commits it should be obvious that this is the right thing to do. Merge commits are a bit subtle. Observe that with default simplification, merge simplification is an all-or-nothing decision: either the merge is TREESAME to one parent and disappears, or it is different from all parents and the parent list remains intact. Redundant parents are not pruned, so the existing code also shows them as a merge. So if we do show a merge commit, the parent list just consists of the rewrite result on each parent. Running, e.g., --cc on this in --full-diff mode is not very useful: if any commits were skipped, some hunks will disagree with all sides of the merge (with one side, because commits were skipped; with the others, because they didn't have those changes in the first place). This triggers --cc showing these hunks spuriously. Therefore I believe that even for merge commits it is better to show the diffs wrt. the original parents. Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Helped-by: Junio C Hamano <gitster@pobox.com> Helped-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Thomas Rast <trast@inf.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-01 04:13:20 +08:00
static inline int want_ancestry(const struct rev_info *revs)
{
return (revs->rewrite_parents || revs->children.name);
}
enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit)
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
{
if (commit->object.flags & SHOWN)
return commit_ignore;
if (revs->unpacked && has_sha1_pack(commit->object.oid.hash))
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
return commit_ignore;
Add "--show-all" revision walker flag for debugging It's really not very easy to visualize the commit walker, because - on purpose - it obvously doesn't show the uninteresting commits! This adds a "--show-all" flag to the revision walker, which will make it show uninteresting commits too, and they'll have a '^' in front of them (it also fixes a logic error for !verbose_header for boundary commits - we should show the '-' even if left_right isn't shown). A separate patch to gitk to teach it the new '^' was sent to paulus. With the change in place, it actually is interesting even for the cases that git doesn't have any problems with, ie for the kernel you can do: gitk -d --show-all v2.6.24.. and you see just how far down it has to parse things to see it all. The use of "-d" is a good idea, since the date-ordered toposort is much better at showing why it goes deep down (ie the date of some of those commits after 2.6.24 is much older, because they were merged from trees that weren't rebased). So I think this is a useful feature even for non-debugging - just to visualize what git does internally more. When it actually breaks out due to the "everybody_uninteresting()" case, it adds the uninteresting commits (both the one it's looking at now, and the list of pending ones) to the list This way, we really list *all* the commits we've looked at. Because we now end up listing commits we may not even have been parsed at all "show_log" and "show_commit" need to protect against commits that don't have a commit buffer entry. That second part is debatable just how it should work. Maybe we shouldn't show such entries at all (with this patch those entries do get shown, they just don't get any message shown with them). But I think this is a useful case. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-02-10 06:02:07 +08:00
if (revs->show_all)
return commit_show;
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
if (commit->object.flags & UNINTERESTING)
return commit_ignore;
if (revs->min_age != -1 && (commit->date > revs->min_age))
return commit_ignore;
if (revs->min_parents || (revs->max_parents >= 0)) {
int n = commit_list_count(commit->parents);
if ((n < revs->min_parents) ||
((revs->max_parents >= 0) && (n > revs->max_parents)))
return commit_ignore;
}
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
if (!commit_match(commit, revs))
return commit_ignore;
if (revs->prune && revs->dense) {
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
/* Commit without changes? */
if (commit->object.flags & TREESAME) {
int n;
struct commit_list *p;
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
/* drop merges unless we want parenthood */
if (!want_ancestry(revs))
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
return commit_ignore;
/*
* If we want ancestry, then need to keep any merges
* between relevant commits to tie together topology.
* For consistency with TREESAME and simplification
* use "relevant" here rather than just INTERESTING,
* to treat bottom commit(s) as part of the topology.
*/
for (n = 0, p = commit->parents; p; p = p->next)
if (relevant_commit(p->item))
if (++n >= 2)
return commit_show;
return commit_ignore;
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
}
}
return commit_show;
}
define_commit_slab(saved_parents, struct commit_list *);
#define EMPTY_PARENT_LIST ((struct commit_list *)-1)
/*
* You may only call save_parents() once per commit (this is checked
* for non-root commits).
*/
static void save_parents(struct rev_info *revs, struct commit *commit)
{
struct commit_list **pp;
if (!revs->saved_parents_slab) {
revs->saved_parents_slab = xmalloc(sizeof(struct saved_parents));
init_saved_parents(revs->saved_parents_slab);
}
pp = saved_parents_at(revs->saved_parents_slab, commit);
/*
* When walking with reflogs, we may visit the same commit
* several times: once for each appearance in the reflog.
*
* In this case, save_parents() will be called multiple times.
* We want to keep only the first set of parents. We need to
* store a sentinel value for an empty (i.e., NULL) parent
* list to distinguish it from a not-yet-saved list, however.
*/
if (*pp)
return;
if (commit->parents)
*pp = copy_commit_list(commit->parents);
else
*pp = EMPTY_PARENT_LIST;
}
static void free_saved_parents(struct rev_info *revs)
{
if (revs->saved_parents_slab)
clear_saved_parents(revs->saved_parents_slab);
}
struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit)
{
struct commit_list *parents;
if (!revs->saved_parents_slab)
return commit->parents;
parents = *saved_parents_at(revs->saved_parents_slab, commit);
if (parents == EMPTY_PARENT_LIST)
return NULL;
return parents;
}
enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
{
enum commit_action action = get_commit_action(revs, commit);
if (action == commit_show &&
!revs->show_all &&
revs->prune && revs->dense && want_ancestry(revs)) {
log: use true parents for diff even when rewriting When using pathspec filtering in combination with diff-based log output, parent simplification happens before the diff is computed. The diff is therefore against the *simplified* parents. This works okay, arguably by accident, in the normal case: simplification reduces to one parent as long as the commit is TREESAME to it. So the simplified parent of any given commit must have the same tree contents on the filtered paths as its true (unfiltered) parent. However, --full-diff breaks this guarantee, and indeed gives pretty spectacular results when comparing the output of git log --graph --stat ... git log --graph --full-diff --stat ... (--graph internally kicks in parent simplification, much like --parents). To fix it, store a copy of the parent list before simplification (in a slab) whenever --full-diff is in effect. Then use the stored parents instead of the simplified ones in the commit display code paths. The latter do not actually check for --full-diff to avoid duplicated code; they just grab the original parents if save_parents() has not been called for this revision walk. For ordinary commits it should be obvious that this is the right thing to do. Merge commits are a bit subtle. Observe that with default simplification, merge simplification is an all-or-nothing decision: either the merge is TREESAME to one parent and disappears, or it is different from all parents and the parent list remains intact. Redundant parents are not pruned, so the existing code also shows them as a merge. So if we do show a merge commit, the parent list just consists of the rewrite result on each parent. Running, e.g., --cc on this in --full-diff mode is not very useful: if any commits were skipped, some hunks will disagree with all sides of the merge (with one side, because commits were skipped; with the others, because they didn't have those changes in the first place). This triggers --cc showing these hunks spuriously. Therefore I believe that even for merge commits it is better to show the diffs wrt. the original parents. Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Helped-by: Junio C Hamano <gitster@pobox.com> Helped-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Thomas Rast <trast@inf.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-01 04:13:20 +08:00
/*
* --full-diff on simplified parents is no good: it
* will show spurious changes from the commits that
* were elided. So we save the parents on the side
* when --full-diff is in effect.
*/
if (revs->full_diff)
save_parents(revs, commit);
if (rewrite_parents(revs, commit, rewrite_one) < 0)
return commit_error;
}
return action;
}
static void track_linear(struct rev_info *revs, struct commit *commit)
{
if (revs->track_first_time) {
revs->linear = 1;
revs->track_first_time = 0;
} else {
struct commit_list *p;
for (p = revs->previous_parents; p; p = p->next)
if (p->item == NULL || /* first commit */
!oidcmp(&p->item->object.oid, &commit->object.oid))
break;
revs->linear = p != NULL;
}
if (revs->reverse) {
if (revs->linear)
commit->object.flags |= TRACK_LINEAR;
}
free_commit_list(revs->previous_parents);
revs->previous_parents = copy_commit_list(commit->parents);
}
static struct commit *get_revision_1(struct rev_info *revs)
{
if (!revs->commits)
return NULL;
do {
struct commit *commit = pop_commit(&revs->commits);
Make path-limiting be incremental when possible. This makes git-rev-list able to do path-limiting without having to parse all of history before it starts showing the results. This makes things like "git log -- pathname" much more pleasant to use. This is actually a pretty small patch, and the biggest part of it is purely cleanups (turning the "goto next" statements into "continue"), but it's conceptually a lot bigger than it looks. What it does is that if you do a path-limited revision list, and you do _not_ ask for pseudo-parenthood information, it won't do all the path-limiting up-front, but instead do it incrementally in "get_revision()". This is an absolutely huge deal for anything like "git log -- <pathname>", but also for some things that we don't do yet - like the "find where things changed" logic I've described elsewhere, where we want to find the previous revision that changed a file. The reason I put "RFC" in the subject line is that while I've validated it various ways, like doing git-rev-list HEAD -- drivers/char/ | md5sum before-and-after on the kernel archive, it's "git-rev-list" after all. In other words, it's that really really subtle and complex central piece of software. So while I think this is important and should go in asap, I also think it should get lots of testing and eyeballs looking at the code. Btw, don't even bother testing this with the git archive. git itself is so small that parsing the whole revision history for it takes about a second even with path limiting. The thing that _really_ shows this off is doing git log drivers/ on the kernel archive, or even better, on the _historic_ kernel archive. With this change, the response is instantaneous (although seeking to the end of the result will obviously take as long as it ever did). Before this change, the command would think about the result for tens of seconds - or even minutes, in the case of the bigger old kernel archive - before starting to output the results. NOTE NOTE NOTE! Using path limiting with things like "gitk", which uses the "--parents" flag to actually generate a pseudo-history of the resulting commits won't actually see the improvement in interactivity, since that forces git-rev-list to do the whole-history thing after all. MAYBE we can fix that too at some point, but I won't promise anything. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-03-31 09:05:25 +08:00
reflogs: clear flags properly in corner case The reflog-walking mechanism is based on the regular revision traversal. We just rewrite the parents of each commit in fake_reflog_parent to point to the commit in the next reflog entry instead of the real parents. However, the regular revision traversal tries not to show the same commit twice, and so sets the SHOWN flag on each commit it shows. In a reflog, however, we may want to see the same commit more than once if it appears in the reflog multiple times (which easily happens, for example, if you do a reset to a prior state). The fake_reflog_parent function takes care of this by clearing flags, including SHOWN. Unfortunately, it does so at the very end of the function, and it is possible to return early from the function if there is no fake parent to set up (e.g., because we are at the very first reflog entry on the branch). In such a case the flag is not cleared, and the entry is skipped by the revision traversal machinery as already shown. You can see this by walking the log of a ref which is set to its very first commit more than once (the test below shows such a situation). In this case the reflog walk will fail to show the entry for the initial creation of the ref. We don't want to simply move the flag-clearing to the top of the function; we want to make sure flags set during the fake-parent installation are also cleared. Instead, let's hoist the flag-clearing out of the fake_reflog_parent function entirely. It's not really about fake parents anyway, and the only caller is the get_revision machinery. Reported-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-22 12:42:53 +08:00
if (revs->reflog_info) {
save_parents(revs, commit);
fake_reflog_parent(revs->reflog_info, commit);
reflogs: clear flags properly in corner case The reflog-walking mechanism is based on the regular revision traversal. We just rewrite the parents of each commit in fake_reflog_parent to point to the commit in the next reflog entry instead of the real parents. However, the regular revision traversal tries not to show the same commit twice, and so sets the SHOWN flag on each commit it shows. In a reflog, however, we may want to see the same commit more than once if it appears in the reflog multiple times (which easily happens, for example, if you do a reset to a prior state). The fake_reflog_parent function takes care of this by clearing flags, including SHOWN. Unfortunately, it does so at the very end of the function, and it is possible to return early from the function if there is no fake parent to set up (e.g., because we are at the very first reflog entry on the branch). In such a case the flag is not cleared, and the entry is skipped by the revision traversal machinery as already shown. You can see this by walking the log of a ref which is set to its very first commit more than once (the test below shows such a situation). In this case the reflog walk will fail to show the entry for the initial creation of the ref. We don't want to simply move the flag-clearing to the top of the function; we want to make sure flags set during the fake-parent installation are also cleared. Instead, let's hoist the flag-clearing out of the fake_reflog_parent function entirely. It's not really about fake parents anyway, and the only caller is the get_revision machinery. Reported-by: Martin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-22 12:42:53 +08:00
commit->object.flags &= ~(ADDED | SEEN | SHOWN);
}
Make path-limiting be incremental when possible. This makes git-rev-list able to do path-limiting without having to parse all of history before it starts showing the results. This makes things like "git log -- pathname" much more pleasant to use. This is actually a pretty small patch, and the biggest part of it is purely cleanups (turning the "goto next" statements into "continue"), but it's conceptually a lot bigger than it looks. What it does is that if you do a path-limited revision list, and you do _not_ ask for pseudo-parenthood information, it won't do all the path-limiting up-front, but instead do it incrementally in "get_revision()". This is an absolutely huge deal for anything like "git log -- <pathname>", but also for some things that we don't do yet - like the "find where things changed" logic I've described elsewhere, where we want to find the previous revision that changed a file. The reason I put "RFC" in the subject line is that while I've validated it various ways, like doing git-rev-list HEAD -- drivers/char/ | md5sum before-and-after on the kernel archive, it's "git-rev-list" after all. In other words, it's that really really subtle and complex central piece of software. So while I think this is important and should go in asap, I also think it should get lots of testing and eyeballs looking at the code. Btw, don't even bother testing this with the git archive. git itself is so small that parsing the whole revision history for it takes about a second even with path limiting. The thing that _really_ shows this off is doing git log drivers/ on the kernel archive, or even better, on the _historic_ kernel archive. With this change, the response is instantaneous (although seeking to the end of the result will obviously take as long as it ever did). Before this change, the command would think about the result for tens of seconds - or even minutes, in the case of the bigger old kernel archive - before starting to output the results. NOTE NOTE NOTE! Using path limiting with things like "gitk", which uses the "--parents" flag to actually generate a pseudo-history of the resulting commits won't actually see the improvement in interactivity, since that forces git-rev-list to do the whole-history thing after all. MAYBE we can fix that too at some point, but I won't promise anything. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-03-31 09:05:25 +08:00
/*
* If we haven't done the list limiting, we need to look at
* the parents here. We also need to do the date-based limiting
* that we'd otherwise have done in limit_list().
Make path-limiting be incremental when possible. This makes git-rev-list able to do path-limiting without having to parse all of history before it starts showing the results. This makes things like "git log -- pathname" much more pleasant to use. This is actually a pretty small patch, and the biggest part of it is purely cleanups (turning the "goto next" statements into "continue"), but it's conceptually a lot bigger than it looks. What it does is that if you do a path-limited revision list, and you do _not_ ask for pseudo-parenthood information, it won't do all the path-limiting up-front, but instead do it incrementally in "get_revision()". This is an absolutely huge deal for anything like "git log -- <pathname>", but also for some things that we don't do yet - like the "find where things changed" logic I've described elsewhere, where we want to find the previous revision that changed a file. The reason I put "RFC" in the subject line is that while I've validated it various ways, like doing git-rev-list HEAD -- drivers/char/ | md5sum before-and-after on the kernel archive, it's "git-rev-list" after all. In other words, it's that really really subtle and complex central piece of software. So while I think this is important and should go in asap, I also think it should get lots of testing and eyeballs looking at the code. Btw, don't even bother testing this with the git archive. git itself is so small that parsing the whole revision history for it takes about a second even with path limiting. The thing that _really_ shows this off is doing git log drivers/ on the kernel archive, or even better, on the _historic_ kernel archive. With this change, the response is instantaneous (although seeking to the end of the result will obviously take as long as it ever did). Before this change, the command would think about the result for tens of seconds - or even minutes, in the case of the bigger old kernel archive - before starting to output the results. NOTE NOTE NOTE! Using path limiting with things like "gitk", which uses the "--parents" flag to actually generate a pseudo-history of the resulting commits won't actually see the improvement in interactivity, since that forces git-rev-list to do the whole-history thing after all. MAYBE we can fix that too at some point, but I won't promise anything. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-03-31 09:05:25 +08:00
*/
if (!revs->limited) {
if (revs->max_age != -1 &&
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
(commit->date < revs->max_age))
continue;
add `ignore_missing_links` mode to revwalk When pack-objects is computing the reachability bitmap to serve a fetch request, it can erroneously die() if some of the UNINTERESTING objects are not present. Upload-pack throws away HAVE lines from the client for objects we do not have, but we may have a tip object without all of its ancestors (e.g., if the tip is no longer reachable and was new enough to survive a `git prune`, but some of its reachable objects did get pruned). In the non-bitmap case, we do a revision walk with the HAVE objects marked as UNINTERESTING. The revision walker explicitly ignores errors in accessing UNINTERESTING commits to handle this case (and we do not bother looking at UNINTERESTING trees or blobs at all). When we have bitmaps, however, the process is quite different. The bitmap index for a pack-objects run is calculated in two separate steps: First, we perform an extensive walk from all the HAVEs to find the full set of objects reachable from them. This walk is usually optimized away because we are expected to hit an object with a bitmap during the traversal, which allows us to terminate early. Secondly, we perform an extensive walk from all the WANTs, which usually also terminates early because we hit a commit with an existing bitmap. Once we have the resulting bitmaps from the two walks, we AND-NOT them together to obtain the resulting set of objects we need to pack. When we are walking the HAVE objects, the revision walker does not know that we are walking it only to mark the results as uninteresting. We strip out the UNINTERESTING flag, because those objects _are_ interesting to us during the first walk. We want to keep going to get a complete set of reachable objects if we can. We need some way to tell the revision walker that it's OK to silently truncate the HAVE walk, just like it does for the UNINTERESTING case. This patch introduces a new `ignore_missing_links` flag to the `rev_info` struct, which we set only for the HAVE walk. It also adds tests to cover UNINTERESTING objects missing from several positions: a missing blob, a missing tree, and a missing parent commit. The missing blob already worked (as we do not care about its contents at all), but the other two cases caused us to die(). Note that there are a few cases we do not need to test: 1. We do not need to test a missing tree, with the blob still present. Without the tree that refers to it, we would not know that the blob is relevant to our walk. 2. We do not need to test a tip commit that is missing. Upload-pack omits these for us (and in fact, we complain even in the non-bitmap case if it fails to do so). Reported-by: Siddharth Agarwal <sid0@fb.com> Signed-off-by: Vicent Marti <tanoku@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-03-28 18:00:43 +08:00
if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
if (!revs->ignore_missing_links)
die("Failed to traverse parents of commit %s",
oid_to_hex(&commit->object.oid));
add `ignore_missing_links` mode to revwalk When pack-objects is computing the reachability bitmap to serve a fetch request, it can erroneously die() if some of the UNINTERESTING objects are not present. Upload-pack throws away HAVE lines from the client for objects we do not have, but we may have a tip object without all of its ancestors (e.g., if the tip is no longer reachable and was new enough to survive a `git prune`, but some of its reachable objects did get pruned). In the non-bitmap case, we do a revision walk with the HAVE objects marked as UNINTERESTING. The revision walker explicitly ignores errors in accessing UNINTERESTING commits to handle this case (and we do not bother looking at UNINTERESTING trees or blobs at all). When we have bitmaps, however, the process is quite different. The bitmap index for a pack-objects run is calculated in two separate steps: First, we perform an extensive walk from all the HAVEs to find the full set of objects reachable from them. This walk is usually optimized away because we are expected to hit an object with a bitmap during the traversal, which allows us to terminate early. Secondly, we perform an extensive walk from all the WANTs, which usually also terminates early because we hit a commit with an existing bitmap. Once we have the resulting bitmaps from the two walks, we AND-NOT them together to obtain the resulting set of objects we need to pack. When we are walking the HAVE objects, the revision walker does not know that we are walking it only to mark the results as uninteresting. We strip out the UNINTERESTING flag, because those objects _are_ interesting to us during the first walk. We want to keep going to get a complete set of reachable objects if we can. We need some way to tell the revision walker that it's OK to silently truncate the HAVE walk, just like it does for the UNINTERESTING case. This patch introduces a new `ignore_missing_links` flag to the `rev_info` struct, which we set only for the HAVE walk. It also adds tests to cover UNINTERESTING objects missing from several positions: a missing blob, a missing tree, and a missing parent commit. The missing blob already worked (as we do not care about its contents at all), but the other two cases caused us to die(). Note that there are a few cases we do not need to test: 1. We do not need to test a missing tree, with the blob still present. Without the tree that refers to it, we would not know that the blob is relevant to our walk. 2. We do not need to test a tip commit that is missing. Upload-pack omits these for us (and in fact, we complain even in the non-bitmap case if it fails to do so). Reported-by: Siddharth Agarwal <sid0@fb.com> Signed-off-by: Vicent Marti <tanoku@gmail.com> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-03-28 18:00:43 +08:00
}
}
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
switch (simplify_commit(revs, commit)) {
case commit_ignore:
continue;
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
case commit_error:
die("Failed to simplify parents of commit %s",
oid_to_hex(&commit->object.oid));
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
default:
if (revs->track_linear)
track_linear(revs, commit);
Enhance --early-output format This makes --early-output a bit more advanced, and actually makes it generate multiple "Final output:" headers as it updates things asynchronously. I realize that the "Final output:" line is now illogical, since it's not really final until it also says "done", but It now _always_ generates a "Final output:" header in front of any commit list, and that output header gives you a *guess* at the maximum number of commits available. However, it should be noted that the guess can be completely off: I do a reasonable job estimating it, but it is not meant to be exact. So what happens is that you may get output like this: - at 0.1 seconds: Final output: 2 incomplete .. 2 commits listed .. - half a second later: Final output: 33 incomplete .. 33 commits listed .. - another half a second after that: Final output: 71 incomplete .. 71 commits listed .. - another half second later: Final output: 136 incomplete .. 100 commits listed: we hit the --early-output limit, and .. will only output 100 commits, and after this you'll not .. see an "incomplete" report any more since you got as much .. early output as you asked for! - .. and then finally: Final output: 73106 done .. all the commits .. The above is a real-life scenario on my current kernel tree after having flushed all the caches. Tested with the experimental gitk patch that Paul sent out, and by looking at the actual log output (and verifying that my commit count guesses actually match real life fairly well). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-11-05 04:12:05 +08:00
return commit;
}
} while (revs->commits);
return NULL;
}
/*
* Return true for entries that have not yet been shown. (This is an
* object_array_each_func_t.)
*/
static int entry_unshown(struct object_array_entry *entry, void *cb_data_unused)
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
{
return !(entry->item->flags & SHOWN);
}
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
/*
* If array is on the verge of a realloc, garbage-collect any entries
* that have already been shown to try to free up some space.
*/
static void gc_boundary(struct object_array *array)
{
if (array->nr == array->alloc)
object_array_filter(array, entry_unshown, NULL);
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
}
static void create_boundary_commit_list(struct rev_info *revs)
{
unsigned i;
struct commit *c;
struct object_array *array = &revs->boundary_commits;
struct object_array_entry *objects = array->objects;
/*
* If revs->commits is non-NULL at this point, an error occurred in
* get_revision_1(). Ignore the error and continue printing the
* boundary commits anyway. (This is what the code has always
* done.)
*/
if (revs->commits) {
free_commit_list(revs->commits);
revs->commits = NULL;
}
/*
* Put all of the actual boundary commits from revs->boundary_commits
* into revs->commits
*/
for (i = 0; i < array->nr; i++) {
c = (struct commit *)(objects[i].item);
if (!c)
continue;
if (!(c->object.flags & CHILD_SHOWN))
continue;
if (c->object.flags & (SHOWN | BOUNDARY))
continue;
c->object.flags |= BOUNDARY;
commit_list_insert(c, &revs->commits);
}
/*
* If revs->topo_order is set, sort the boundary commits
* in topological order
*/
toposort: rename "lifo" field The primary invariant of sort_in_topological_order() is that a parent commit is not emitted until all children of it are. When traversing a forked history like this with "git log C E": A----B----C \ D----E we ensure that A is emitted after all of B, C, D, and E are done, B has to wait until C is done, and D has to wait until E is done. In some applications, however, we would further want to control how these child commits B, C, D and E on two parallel ancestry chains are shown. Most of the time, we would want to see C and B emitted together, and then E and D, and finally A (i.e. the --topo-order output). The "lifo" parameter of the sort_in_topological_order() function is used to control this behaviour. We start the traversal by knowing two commits, C and E. While keeping in mind that we also need to inspect E later, we pick C first to inspect, and we notice and record that B needs to be inspected. By structuring the "work to be done" set as a LIFO stack, we ensure that B is inspected next, before other in-flight commits we had known that we will need to inspect, e.g. E. When showing in --date-order, we would want to see commits ordered by timestamps, i.e. show C, E, B and D in this order before showing A, possibly mixing commits from two parallel histories together. When "lifo" parameter is set to false, the function keeps the "work to be done" set sorted in the date order to realize this semantics. After inspecting C, we add B to the "work to be done" set, but the next commit we inspect from the set is E which is newer than B. The name "lifo", however, is too strongly tied to the way how the function implements its behaviour, and does not describe what the behaviour _means_. Replace this field with an enum rev_sort_order, with two possible values: REV_SORT_IN_GRAPH_ORDER and REV_SORT_BY_COMMIT_DATE, and update the existing code. The mechanical replacement rule is: "lifo == 0" is equivalent to "sort_order == REV_SORT_BY_COMMIT_DATE" "lifo == 1" is equivalent to "sort_order == REV_SORT_IN_GRAPH_ORDER" Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-07 07:07:14 +08:00
sort_in_topological_order(&revs->commits, revs->sort_order);
}
static struct commit *get_revision_internal(struct rev_info *revs)
{
struct commit *c = NULL;
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
struct commit_list *l;
if (revs->boundary == 2) {
/*
* All of the normal commits have already been returned,
* and we are now returning boundary commits.
* create_boundary_commit_list() has populated
* revs->commits with the remaining commits to return.
*/
c = pop_commit(&revs->commits);
if (c)
c->object.flags |= SHOWN;
return c;
}
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
/*
revision: avoid work after --max-count is reached During a revision traversal in which --max-count has been specified, we decrement a counter for each revision returned by get_revision. When it hits 0, we typically return NULL (the exception being if we still have boundary commits to show). However, before we check the counter, we call get_revision_1 to get the next commit. This might involve looking at a large number of commits if we have restricted the traversal (e.g., we might traverse until we find the next commit whose diff actually matches a pathspec). There's no need to make this get_revision_1 call when our counter runs out. If we are not in --boundary mode, we will just throw away the result and immediately return NULL. If we are in --boundary mode, then we will still throw away the result, and then start showing the boundary commits. However, as git_revision_1 does not impact the boundary list, it should not have an impact. In most cases, avoiding this work will not be especially noticeable. However, in some cases, it can make a big difference: [before] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.301s user 0m0.280s sys 0m0.016s [after] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.010s user 0m0.008s sys 0m0.000s Note that the output is produced almost instantaneously in the first case, and then git uselessly spends a long time looking for the next commit to touch that file (but there isn't one, and we traverse all the way down to the roots). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-13 15:50:23 +08:00
* If our max_count counter has reached zero, then we are done. We
* don't simply return NULL because we still might need to show
* boundary commits. But we want to avoid calling get_revision_1, which
* might do a considerable amount of work finding the next commit only
* for us to throw it away.
*
* If it is non-zero, then either we don't have a max_count at all
* (-1), or it is still counting, in which case we decrement.
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
*/
revision: avoid work after --max-count is reached During a revision traversal in which --max-count has been specified, we decrement a counter for each revision returned by get_revision. When it hits 0, we typically return NULL (the exception being if we still have boundary commits to show). However, before we check the counter, we call get_revision_1 to get the next commit. This might involve looking at a large number of commits if we have restricted the traversal (e.g., we might traverse until we find the next commit whose diff actually matches a pathspec). There's no need to make this get_revision_1 call when our counter runs out. If we are not in --boundary mode, we will just throw away the result and immediately return NULL. If we are in --boundary mode, then we will still throw away the result, and then start showing the boundary commits. However, as git_revision_1 does not impact the boundary list, it should not have an impact. In most cases, avoiding this work will not be especially noticeable. However, in some cases, it can make a big difference: [before] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.301s user 0m0.280s sys 0m0.016s [after] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.010s user 0m0.008s sys 0m0.000s Note that the output is produced almost instantaneously in the first case, and then git uselessly spends a long time looking for the next commit to touch that file (but there isn't one, and we traverse all the way down to the roots). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-13 15:50:23 +08:00
if (revs->max_count) {
c = get_revision_1(revs);
if (c) {
while (revs->skip_count > 0) {
revision: avoid work after --max-count is reached During a revision traversal in which --max-count has been specified, we decrement a counter for each revision returned by get_revision. When it hits 0, we typically return NULL (the exception being if we still have boundary commits to show). However, before we check the counter, we call get_revision_1 to get the next commit. This might involve looking at a large number of commits if we have restricted the traversal (e.g., we might traverse until we find the next commit whose diff actually matches a pathspec). There's no need to make this get_revision_1 call when our counter runs out. If we are not in --boundary mode, we will just throw away the result and immediately return NULL. If we are in --boundary mode, then we will still throw away the result, and then start showing the boundary commits. However, as git_revision_1 does not impact the boundary list, it should not have an impact. In most cases, avoiding this work will not be especially noticeable. However, in some cases, it can make a big difference: [before] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.301s user 0m0.280s sys 0m0.016s [after] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.010s user 0m0.008s sys 0m0.000s Note that the output is produced almost instantaneously in the first case, and then git uselessly spends a long time looking for the next commit to touch that file (but there isn't one, and we traverse all the way down to the roots). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-13 15:50:23 +08:00
revs->skip_count--;
c = get_revision_1(revs);
if (!c)
break;
}
}
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
revision: avoid work after --max-count is reached During a revision traversal in which --max-count has been specified, we decrement a counter for each revision returned by get_revision. When it hits 0, we typically return NULL (the exception being if we still have boundary commits to show). However, before we check the counter, we call get_revision_1 to get the next commit. This might involve looking at a large number of commits if we have restricted the traversal (e.g., we might traverse until we find the next commit whose diff actually matches a pathspec). There's no need to make this get_revision_1 call when our counter runs out. If we are not in --boundary mode, we will just throw away the result and immediately return NULL. If we are in --boundary mode, then we will still throw away the result, and then start showing the boundary commits. However, as git_revision_1 does not impact the boundary list, it should not have an impact. In most cases, avoiding this work will not be especially noticeable. However, in some cases, it can make a big difference: [before] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.301s user 0m0.280s sys 0m0.016s [after] $ time git rev-list -1 origin Documentation/RelNotes/1.7.11.2.txt 8d141a1d562abb31f27f599dbf6e10a6c06ed73e real 0m0.010s user 0m0.008s sys 0m0.000s Note that the output is produced almost instantaneously in the first case, and then git uselessly spends a long time looking for the next commit to touch that file (but there isn't one, and we traverse all the way down to the roots). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-07-13 15:50:23 +08:00
if (revs->max_count > 0)
revs->max_count--;
}
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
if (c)
c->object.flags |= SHOWN;
if (!revs->boundary)
return c;
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
if (!c) {
/*
* get_revision_1() runs out the commits, and
* we are done computing the boundaries.
* switch to boundary commits output mode.
*/
revs->boundary = 2;
/*
* Update revs->commits to contain the list of
* boundary commits.
*/
create_boundary_commit_list(revs);
return get_revision_internal(revs);
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
}
/*
* boundary commits are the commits that are parents of the
* ones we got from get_revision_1() but they themselves are
* not returned from get_revision_1(). Before returning
* 'c', we need to mark its parents that they could be boundaries.
*/
for (l = c->parents; l; l = l->next) {
struct object *p;
p = &(l->item->object);
if (p->flags & (CHILD_SHOWN | SHOWN))
revision walker: Fix --boundary when limited This cleans up the boundary processing in the commit walker. It - rips out the boundary logic from the commit walker. Placing "negative" commits in the revs->commits list was Ok if all we cared about "boundary" was the UNINTERESTING limiting case, but conceptually it was wrong. - makes get_revision_1() function to walk the commits and return the results as if there is no funny postprocessing flags such as --reverse, --skip nor --max-count. - makes get_revision() function the postprocessing phase: If reverse is given, wait for get_revision_1() to give everything that it would normally give, and then reverse it before consuming. If skip is given, skip that many before going further. If max is given, stop when we gave out that many. Now that we are about to return one positive commit, mark the parents of that commit to be potential boundaries before returning, iff we are doing the boundary processing. Return the commit. - After get_revision() finishes giving out all the positive commits, if we are doing the boundary processing, we look at the parents that we marked as potential boundaries earlier, see if they are really boundaries, and give them out. It loses more code than it adds, even when the new gc_boundary() function, which is purely for early optimization, is counted. Note that this patch is purely for eyeballing and discussion only. It breaks git-bundle's verify logic because the logic does not use BOUNDARY_SHOW flag for its internal computation anymore. After we correct it not to attempt to affect the boundary processing by setting the BOUNDARY_SHOW flag, we can remove BOUNDARY_SHOW from revision.h and use that bit assignment for the new CHILD_SHOWN flag. Signed-off-by: Junio C Hamano <junkio@cox.net>
2007-03-06 05:10:06 +08:00
continue;
p->flags |= CHILD_SHOWN;
gc_boundary(&revs->boundary_commits);
add_object_array(p, NULL, &revs->boundary_commits);
}
return c;
}
struct commit *get_revision(struct rev_info *revs)
{
struct commit *c;
struct commit_list *reversed;
if (revs->reverse) {
reversed = NULL;
while ((c = get_revision_internal(revs)))
commit_list_insert(c, &reversed);
revs->commits = reversed;
revs->reverse = 0;
revs->reverse_output_stage = 1;
}
if (revs->reverse_output_stage) {
c = pop_commit(&revs->commits);
if (revs->track_linear)
revs->linear = !!(c && c->object.flags & TRACK_LINEAR);
return c;
}
c = get_revision_internal(revs);
if (c && revs->graph)
graph_update(revs->graph, c);
if (!c) {
log: use true parents for diff even when rewriting When using pathspec filtering in combination with diff-based log output, parent simplification happens before the diff is computed. The diff is therefore against the *simplified* parents. This works okay, arguably by accident, in the normal case: simplification reduces to one parent as long as the commit is TREESAME to it. So the simplified parent of any given commit must have the same tree contents on the filtered paths as its true (unfiltered) parent. However, --full-diff breaks this guarantee, and indeed gives pretty spectacular results when comparing the output of git log --graph --stat ... git log --graph --full-diff --stat ... (--graph internally kicks in parent simplification, much like --parents). To fix it, store a copy of the parent list before simplification (in a slab) whenever --full-diff is in effect. Then use the stored parents instead of the simplified ones in the commit display code paths. The latter do not actually check for --full-diff to avoid duplicated code; they just grab the original parents if save_parents() has not been called for this revision walk. For ordinary commits it should be obvious that this is the right thing to do. Merge commits are a bit subtle. Observe that with default simplification, merge simplification is an all-or-nothing decision: either the merge is TREESAME to one parent and disappears, or it is different from all parents and the parent list remains intact. Redundant parents are not pruned, so the existing code also shows them as a merge. So if we do show a merge commit, the parent list just consists of the rewrite result on each parent. Running, e.g., --cc on this in --full-diff mode is not very useful: if any commits were skipped, some hunks will disagree with all sides of the merge (with one side, because commits were skipped; with the others, because they didn't have those changes in the first place). This triggers --cc showing these hunks spuriously. Therefore I believe that even for merge commits it is better to show the diffs wrt. the original parents. Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Helped-by: Junio C Hamano <gitster@pobox.com> Helped-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk> Signed-off-by: Thomas Rast <trast@inf.ethz.ch> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-08-01 04:13:20 +08:00
free_saved_parents(revs);
if (revs->previous_parents) {
free_commit_list(revs->previous_parents);
revs->previous_parents = NULL;
}
}
return c;
}
char *get_revision_mark(const struct rev_info *revs, const struct commit *commit)
{
if (commit->object.flags & BOUNDARY)
return "-";
else if (commit->object.flags & UNINTERESTING)
return "^";
else if (commit->object.flags & PATCHSAME)
return "=";
else if (!revs || revs->left_right) {
if (commit->object.flags & SYMMETRIC_LEFT)
return "<";
else
return ">";
} else if (revs->graph)
return "*";
else if (revs->cherry_mark)
return "+";
return "";
}
void put_revision_mark(const struct rev_info *revs, const struct commit *commit)
{
char *mark = get_revision_mark(revs, commit);
if (!strlen(mark))
return;
fputs(mark, stdout);
putchar(' ');
}