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b60e188c51
Strip the name length from the ce_flags field and move it into its own ce_namelen field in struct cache_entry. This will both give us a tiny bit of a performance enhancement when working with long pathnames and is a refactoring for more readability of the code. It enhances readability, by making it more clear what is a flag, and where the length is stored and make it clear which functions use stages in comparisions and which only use the length. It also makes CE_NAMEMASK private, so that users don't mistakenly write the name length in the flags. Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
246 lines
6.2 KiB
C
246 lines
6.2 KiB
C
#include "cache.h"
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#include "cache-tree.h"
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#include "tree.h"
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#include "blob.h"
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#include "commit.h"
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#include "tag.h"
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#include "tree-walk.h"
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const char *tree_type = "tree";
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static int read_one_entry_opt(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, int opt)
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{
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int len;
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unsigned int size;
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struct cache_entry *ce;
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if (S_ISDIR(mode))
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return READ_TREE_RECURSIVE;
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len = strlen(pathname);
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size = cache_entry_size(baselen + len);
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ce = xcalloc(1, size);
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ce->ce_mode = create_ce_mode(mode);
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ce->ce_flags = create_ce_flags(stage);
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ce->ce_namelen = baselen + len;
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memcpy(ce->name, base, baselen);
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memcpy(ce->name + baselen, pathname, len+1);
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hashcpy(ce->sha1, sha1);
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return add_cache_entry(ce, opt);
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}
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static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
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{
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return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
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ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
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}
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/*
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* This is used when the caller knows there is no existing entries at
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* the stage that will conflict with the entry being added.
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*/
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static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
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{
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return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
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ADD_CACHE_JUST_APPEND);
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}
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static int read_tree_1(struct tree *tree, struct strbuf *base,
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int stage, struct pathspec *pathspec,
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read_tree_fn_t fn, void *context)
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{
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struct tree_desc desc;
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struct name_entry entry;
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unsigned char sha1[20];
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int len, oldlen = base->len;
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enum interesting retval = entry_not_interesting;
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if (parse_tree(tree))
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return -1;
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init_tree_desc(&desc, tree->buffer, tree->size);
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while (tree_entry(&desc, &entry)) {
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if (retval != all_entries_interesting) {
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retval = tree_entry_interesting(&entry, base, 0, pathspec);
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if (retval == all_entries_not_interesting)
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break;
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if (retval == entry_not_interesting)
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continue;
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}
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switch (fn(entry.sha1, base->buf, base->len,
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entry.path, entry.mode, stage, context)) {
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case 0:
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continue;
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case READ_TREE_RECURSIVE:
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break;
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default:
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return -1;
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}
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if (S_ISDIR(entry.mode))
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hashcpy(sha1, entry.sha1);
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else if (S_ISGITLINK(entry.mode)) {
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struct commit *commit;
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commit = lookup_commit(entry.sha1);
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if (!commit)
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die("Commit %s in submodule path %s%s not found",
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sha1_to_hex(entry.sha1),
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base->buf, entry.path);
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if (parse_commit(commit))
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die("Invalid commit %s in submodule path %s%s",
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sha1_to_hex(entry.sha1),
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base->buf, entry.path);
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hashcpy(sha1, commit->tree->object.sha1);
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}
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else
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continue;
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len = tree_entry_len(&entry);
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strbuf_add(base, entry.path, len);
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strbuf_addch(base, '/');
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retval = read_tree_1(lookup_tree(sha1),
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base, stage, pathspec,
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fn, context);
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strbuf_setlen(base, oldlen);
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if (retval)
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return -1;
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}
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return 0;
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}
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int read_tree_recursive(struct tree *tree,
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const char *base, int baselen,
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int stage, struct pathspec *pathspec,
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read_tree_fn_t fn, void *context)
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{
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struct strbuf sb = STRBUF_INIT;
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int ret;
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strbuf_add(&sb, base, baselen);
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ret = read_tree_1(tree, &sb, stage, pathspec, fn, context);
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strbuf_release(&sb);
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return ret;
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}
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static int cmp_cache_name_compare(const void *a_, const void *b_)
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{
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const struct cache_entry *ce1, *ce2;
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ce1 = *((const struct cache_entry **)a_);
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ce2 = *((const struct cache_entry **)b_);
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return cache_name_stage_compare(ce1->name, ce1->ce_namelen, ce_stage(ce1),
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ce2->name, ce2->ce_namelen, ce_stage(ce2));
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}
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int read_tree(struct tree *tree, int stage, struct pathspec *match)
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{
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read_tree_fn_t fn = NULL;
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int i, err;
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/*
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* Currently the only existing callers of this function all
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* call it with stage=1 and after making sure there is nothing
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* at that stage; we could always use read_one_entry_quick().
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*
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* But when we decide to straighten out git-read-tree not to
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* use unpack_trees() in some cases, this will probably start
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* to matter.
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*/
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/*
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* See if we have cache entry at the stage. If so,
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* do it the original slow way, otherwise, append and then
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* sort at the end.
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*/
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for (i = 0; !fn && i < active_nr; i++) {
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struct cache_entry *ce = active_cache[i];
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if (ce_stage(ce) == stage)
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fn = read_one_entry;
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}
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if (!fn)
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fn = read_one_entry_quick;
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err = read_tree_recursive(tree, "", 0, stage, match, fn, NULL);
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if (fn == read_one_entry || err)
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return err;
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/*
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* Sort the cache entry -- we need to nuke the cache tree, though.
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*/
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cache_tree_free(&active_cache_tree);
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qsort(active_cache, active_nr, sizeof(active_cache[0]),
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cmp_cache_name_compare);
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return 0;
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}
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struct tree *lookup_tree(const unsigned char *sha1)
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{
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struct object *obj = lookup_object(sha1);
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if (!obj)
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return create_object(sha1, OBJ_TREE, alloc_tree_node());
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if (!obj->type)
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obj->type = OBJ_TREE;
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if (obj->type != OBJ_TREE) {
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error("Object %s is a %s, not a tree",
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sha1_to_hex(sha1), typename(obj->type));
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return NULL;
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}
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return (struct tree *) obj;
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}
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int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
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{
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if (item->object.parsed)
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return 0;
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item->object.parsed = 1;
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item->buffer = buffer;
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item->size = size;
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return 0;
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}
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int parse_tree(struct tree *item)
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{
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enum object_type type;
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void *buffer;
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unsigned long size;
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if (item->object.parsed)
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return 0;
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buffer = read_sha1_file(item->object.sha1, &type, &size);
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if (!buffer)
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return error("Could not read %s",
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sha1_to_hex(item->object.sha1));
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if (type != OBJ_TREE) {
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free(buffer);
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return error("Object %s not a tree",
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sha1_to_hex(item->object.sha1));
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}
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return parse_tree_buffer(item, buffer, size);
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}
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struct tree *parse_tree_indirect(const unsigned char *sha1)
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{
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struct object *obj = parse_object(sha1);
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do {
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if (!obj)
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return NULL;
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if (obj->type == OBJ_TREE)
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return (struct tree *) obj;
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else if (obj->type == OBJ_COMMIT)
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obj = &(((struct commit *) obj)->tree->object);
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else if (obj->type == OBJ_TAG)
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obj = ((struct tag *) obj)->tagged;
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else
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return NULL;
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if (!obj->parsed)
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parse_object(obj->sha1);
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} while (1);
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}
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