commit: allow prepare_commit_graft to handle arbitrary repositories
[git/git.git] / object.h
1 #ifndef OBJECT_H
2 #define OBJECT_H
3
4 struct parsed_object_pool {
5 struct object **obj_hash;
6 int nr_objs, obj_hash_size;
7
8 /* TODO: migrate alloc_states to mem-pool? */
9 struct alloc_state *blob_state;
10 struct alloc_state *tree_state;
11 struct alloc_state *commit_state;
12 struct alloc_state *tag_state;
13 struct alloc_state *object_state;
14 unsigned commit_count;
15
16 /* parent substitutions from .git/info/grafts and .git/shallow */
17 struct commit_graft **grafts;
18 int grafts_alloc, grafts_nr;
19
20 int is_shallow;
21 struct stat_validity *shallow_stat;
22 char *alternate_shallow_file;
23
24 int commit_graft_prepared;
25 };
26
27 struct parsed_object_pool *parsed_object_pool_new(void);
28 void parsed_object_pool_clear(struct parsed_object_pool *o);
29
30 struct object_list {
31 struct object *item;
32 struct object_list *next;
33 };
34
35 struct object_array {
36 unsigned int nr;
37 unsigned int alloc;
38 struct object_array_entry {
39 struct object *item;
40 /*
41 * name or NULL. If non-NULL, the memory pointed to
42 * is owned by this object *except* if it points at
43 * object_array_slopbuf, which is a static copy of the
44 * empty string.
45 */
46 char *name;
47 char *path;
48 unsigned mode;
49 } *objects;
50 };
51
52 #define OBJECT_ARRAY_INIT { 0, 0, NULL }
53
54 #define TYPE_BITS 3
55 /*
56 * object flag allocation:
57 * revision.h: 0---------10 26
58 * fetch-pack.c: 0----5
59 * walker.c: 0-2
60 * upload-pack.c: 4 11----------------19
61 * builtin/blame.c: 12-13
62 * bisect.c: 16
63 * bundle.c: 16
64 * http-push.c: 16-----19
65 * commit.c: 16-----19
66 * sha1_name.c: 20
67 * list-objects-filter.c: 21
68 * builtin/fsck.c: 0--3
69 * builtin/index-pack.c: 2021
70 * builtin/pack-objects.c: 20
71 * builtin/reflog.c: 10--12
72 * builtin/unpack-objects.c: 2021
73 */
74 #define FLAG_BITS 27
75
76 /*
77 * The object type is stored in 3 bits.
78 */
79 struct object {
80 unsigned parsed : 1;
81 unsigned type : TYPE_BITS;
82 unsigned flags : FLAG_BITS;
83 struct object_id oid;
84 };
85
86 extern const char *type_name(unsigned int type);
87 extern int type_from_string_gently(const char *str, ssize_t, int gentle);
88 #define type_from_string(str) type_from_string_gently(str, -1, 0)
89
90 /*
91 * Return the current number of buckets in the object hashmap.
92 */
93 extern unsigned int get_max_object_index(void);
94
95 /*
96 * Return the object from the specified bucket in the object hashmap.
97 */
98 extern struct object *get_indexed_object(unsigned int);
99
100 /*
101 * This can be used to see if we have heard of the object before, but
102 * it can return "yes we have, and here is a half-initialised object"
103 * for an object that we haven't loaded/parsed yet.
104 *
105 * When parsing a commit to create an in-core commit object, its
106 * parents list holds commit objects that represent its parents, but
107 * they are expected to be lazily initialized and do not know what
108 * their trees or parents are yet. When this function returns such a
109 * half-initialised objects, the caller is expected to initialize them
110 * by calling parse_object() on them.
111 */
112 struct object *lookup_object(const unsigned char *sha1);
113
114 extern void *create_object(struct repository *r, const unsigned char *sha1, void *obj);
115
116 void *object_as_type(struct object *obj, enum object_type type, int quiet);
117
118 /*
119 * Returns the object, having parsed it to find out what it is.
120 *
121 * Returns NULL if the object is missing or corrupt.
122 */
123 struct object *parse_object(const struct object_id *oid);
124
125 /*
126 * Like parse_object, but will die() instead of returning NULL. If the
127 * "name" parameter is not NULL, it is included in the error message
128 * (otherwise, the hex object ID is given).
129 */
130 struct object *parse_object_or_die(const struct object_id *oid, const char *name);
131
132 /* Given the result of read_sha1_file(), returns the object after
133 * parsing it. eaten_p indicates if the object has a borrowed copy
134 * of buffer and the caller should not free() it.
135 */
136 struct object *parse_object_buffer(const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
137
138 /** Returns the object, with potentially excess memory allocated. **/
139 struct object *lookup_unknown_object(const unsigned char *sha1);
140
141 struct object_list *object_list_insert(struct object *item,
142 struct object_list **list_p);
143
144 int object_list_contains(struct object_list *list, struct object *obj);
145
146 /* Object array handling .. */
147 void add_object_array(struct object *obj, const char *name, struct object_array *array);
148 void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
149
150 /*
151 * Returns NULL if the array is empty. Otherwise, returns the last object
152 * after removing its entry from the array. Other resources associated
153 * with that object are left in an unspecified state and should not be
154 * examined.
155 */
156 struct object *object_array_pop(struct object_array *array);
157
158 typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
159
160 /*
161 * Apply want to each entry in array, retaining only the entries for
162 * which the function returns true. Preserve the order of the entries
163 * that are retained.
164 */
165 void object_array_filter(struct object_array *array,
166 object_array_each_func_t want, void *cb_data);
167
168 /*
169 * Remove from array all but the first entry with a given name.
170 * Warning: this function uses an O(N^2) algorithm.
171 */
172 void object_array_remove_duplicates(struct object_array *array);
173
174 /*
175 * Remove any objects from the array, freeing all used memory; afterwards
176 * the array is ready to store more objects with add_object_array().
177 */
178 void object_array_clear(struct object_array *array);
179
180 void clear_object_flags(unsigned flags);
181
182 /*
183 * Clear the specified object flags from all in-core commit objects.
184 */
185 extern void clear_commit_marks_all(unsigned int flags);
186
187 #endif /* OBJECT_H */