summaryrefslogtreecommitdiff
path: root/object.h
blob: 5c13955000cdaec252f29a3b93599560c35deb8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
#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;
		char *path;
		unsigned mode;
	} *objects;
};

#define OBJECT_ARRAY_INIT { 0, 0, NULL }

/*
 * object flag allocation:
 * revision.h:               0---------10                                26
 * fetch-pack.c:             0----5
 * walker.c:                 0-2
 * upload-pack.c:                4       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
 * list-objects-filter.c:                                      21
 * builtin/fsck.c:           0--3
 * builtin/index-pack.c:                                     2021
 * builtin/pack-objects.c:                                   20
 * builtin/reflog.c:                   10--12
 * builtin/unpack-objects.c:                                 2021
 */
#define FLAG_BITS  27

/*
 * The object type is stored in 3 bits.
 */
struct object {
	unsigned parsed : 1;
	unsigned type : TYPE_BITS;
	unsigned flags : FLAG_BITS;
	struct object_id oid;
};

extern const char *type_name(unsigned int type);
extern int type_from_string_gently(const char *str, ssize_t, int gentle);
#define type_from_string(str) type_from_string_gently(str, -1, 0)

/*
 * 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 struct object_id *oid);

/*
 * 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 hex object ID is given).
 */
struct object *parse_object_or_die(const struct object_id *oid, 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 struct object_id *oid, 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_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);

/*
 * Returns NULL if the array is empty. Otherwise, returns the last object
 * after removing its entry from the array. Other resources associated
 * with that object are left in an unspecified state and should not be
 * examined.
 */
struct object *object_array_pop(struct object_array *array);

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);

/*
 * Remove any objects from the array, freeing all used memory; afterwards
 * the array is ready to store more objects with add_object_array().
 */
void object_array_clear(struct object_array *array);

void clear_object_flags(unsigned flags);

/*
 * Clear the specified object flags from all in-core commit objects.
 */
extern void clear_commit_marks_all(unsigned int flags);

#endif /* OBJECT_H */