mirror of
https://github.com/git/git.git
synced 2024-12-12 03:14:11 +08:00
c4ad00f8cc
When we call lookup_commit, lookup_tree, etc, the logic goes
something like:
1. Look for an existing object struct. If we don't have
one, allocate and return a new one.
2. Double check that any object we have is the expected
type (and complain and return NULL otherwise).
3. Convert an object with type OBJ_NONE (from a prior
call to lookup_unknown_object) to the expected type.
We can encapsulate steps 2 and 3 in a helper function which
checks whether we have the expected object type, converts
OBJ_NONE as appropriate, and returns the object.
Not only does this shorten the code, but it also provides
one central location for converting OBJ_NONE objects into
objects of other types. Future patches will use that to
enforce type-specific invariants.
Since this is a refactoring, we would want it to behave
exactly as the current code. It takes a little reasoning to
see that this is the case:
- for lookup_{commit,tree,etc} functions, we are just
pulling steps 2 and 3 into a function that does the same
thing.
- for the call in peel_object, we currently only do step 3
(but we want to consolidate it with the others, as
mentioned above). However, step 2 is a noop here, as the
surrounding conditional makes sure we have OBJ_NONE
(which we want to keep to avoid an extraneous call to
sha1_object_info).
- for the call in lookup_commit_reference_gently, we are
currently doing step 2 but not step 3. However, step 3
is a noop here. The object we got will have just come
from deref_tag, which must have figured out the type for
each object in order to know when to stop peeling.
Therefore the type will never be OBJ_NONE.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
138 lines
4.4 KiB
C
138 lines
4.4 KiB
C
#ifndef OBJECT_H
|
|
#define OBJECT_H
|
|
|
|
struct object_list {
|
|
struct object *item;
|
|
struct object_list *next;
|
|
};
|
|
|
|
struct object_array {
|
|
unsigned int nr;
|
|
unsigned int alloc;
|
|
struct object_array_entry {
|
|
struct object *item;
|
|
/*
|
|
* name or NULL. If non-NULL, the memory pointed to
|
|
* is owned by this object *except* if it points at
|
|
* object_array_slopbuf, which is a static copy of the
|
|
* empty string.
|
|
*/
|
|
char *name;
|
|
unsigned mode;
|
|
struct object_context *context;
|
|
} *objects;
|
|
};
|
|
|
|
#define OBJECT_ARRAY_INIT { 0, 0, NULL }
|
|
|
|
#define TYPE_BITS 3
|
|
/*
|
|
* object flag allocation:
|
|
* revision.h: 0---------10 26
|
|
* fetch-pack.c: 0---4
|
|
* walker.c: 0-2
|
|
* upload-pack.c: 11----------------19
|
|
* builtin/blame.c: 12-13
|
|
* bisect.c: 16
|
|
* bundle.c: 16
|
|
* http-push.c: 16-----19
|
|
* commit.c: 16-----19
|
|
* sha1_name.c: 20
|
|
*/
|
|
#define FLAG_BITS 27
|
|
|
|
/*
|
|
* The object type is stored in 3 bits.
|
|
*/
|
|
struct object {
|
|
unsigned parsed : 1;
|
|
unsigned used : 1;
|
|
unsigned type : TYPE_BITS;
|
|
unsigned flags : FLAG_BITS;
|
|
unsigned char sha1[20];
|
|
};
|
|
|
|
extern const char *typename(unsigned int type);
|
|
extern int type_from_string(const char *str);
|
|
|
|
/*
|
|
* Return the current number of buckets in the object hashmap.
|
|
*/
|
|
extern unsigned int get_max_object_index(void);
|
|
|
|
/*
|
|
* Return the object from the specified bucket in the object hashmap.
|
|
*/
|
|
extern struct object *get_indexed_object(unsigned int);
|
|
|
|
/*
|
|
* This can be used to see if we have heard of the object before, but
|
|
* it can return "yes we have, and here is a half-initialised object"
|
|
* for an object that we haven't loaded/parsed yet.
|
|
*
|
|
* When parsing a commit to create an in-core commit object, its
|
|
* parents list holds commit objects that represent its parents, but
|
|
* they are expected to be lazily initialized and do not know what
|
|
* their trees or parents are yet. When this function returns such a
|
|
* half-initialised objects, the caller is expected to initialize them
|
|
* by calling parse_object() on them.
|
|
*/
|
|
struct object *lookup_object(const unsigned char *sha1);
|
|
|
|
extern void *create_object(const unsigned char *sha1, void *obj);
|
|
|
|
void *object_as_type(struct object *obj, enum object_type type, int quiet);
|
|
|
|
/*
|
|
* Returns the object, having parsed it to find out what it is.
|
|
*
|
|
* Returns NULL if the object is missing or corrupt.
|
|
*/
|
|
struct object *parse_object(const unsigned char *sha1);
|
|
|
|
/*
|
|
* Like parse_object, but will die() instead of returning NULL. If the
|
|
* "name" parameter is not NULL, it is included in the error message
|
|
* (otherwise, the sha1 hex is given).
|
|
*/
|
|
struct object *parse_object_or_die(const unsigned char *sha1, const char *name);
|
|
|
|
/* Given the result of read_sha1_file(), returns the object after
|
|
* parsing it. eaten_p indicates if the object has a borrowed copy
|
|
* of buffer and the caller should not free() it.
|
|
*/
|
|
struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
|
|
|
|
/** Returns the object, with potentially excess memory allocated. **/
|
|
struct object *lookup_unknown_object(const unsigned char *sha1);
|
|
|
|
struct object_list *object_list_insert(struct object *item,
|
|
struct object_list **list_p);
|
|
|
|
int object_list_contains(struct object_list *list, struct object *obj);
|
|
|
|
/* Object array handling .. */
|
|
void add_object_array(struct object *obj, const char *name, struct object_array *array);
|
|
void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode);
|
|
void add_object_array_with_context(struct object *obj, const char *name, struct object_array *array, struct object_context *context);
|
|
|
|
typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
|
|
|
|
/*
|
|
* Apply want to each entry in array, retaining only the entries for
|
|
* which the function returns true. Preserve the order of the entries
|
|
* that are retained.
|
|
*/
|
|
void object_array_filter(struct object_array *array,
|
|
object_array_each_func_t want, void *cb_data);
|
|
|
|
/*
|
|
* Remove from array all but the first entry with a given name.
|
|
* Warning: this function uses an O(N^2) algorithm.
|
|
*/
|
|
void object_array_remove_duplicates(struct object_array *array);
|
|
|
|
void clear_object_flags(unsigned flags);
|
|
|
|
#endif /* OBJECT_H */
|