Andrew's git - gitweb.git/blob

   1#ifndef OBJECT_H
   2#define OBJECT_H
   3
   4struct buffer_slab;
   5
   6struct parsed_object_pool {
   7        struct object **obj_hash;
   8        int nr_objs, obj_hash_size;
   9
  10        /* TODO: migrate alloc_states to mem-pool? */
  11        struct alloc_state *blob_state;
  12        struct alloc_state *tree_state;
  13        struct alloc_state *commit_state;
  14        struct alloc_state *tag_state;
  15        struct alloc_state *object_state;
  16        unsigned commit_count;
  17
  18        /* parent substitutions from .git/info/grafts and .git/shallow */
  19        struct commit_graft **grafts;
  20        int grafts_alloc, grafts_nr;
  21
  22        int is_shallow;
  23        struct stat_validity *shallow_stat;
  24        char *alternate_shallow_file;
  25
  26        int commit_graft_prepared;
  27
  28        struct buffer_slab *buffer_slab;
  29};
  30
  31struct parsed_object_pool *parsed_object_pool_new(void);
  32void parsed_object_pool_clear(struct parsed_object_pool *o);
  33
  34struct object_list {
  35        struct object *item;
  36        struct object_list *next;
  37};
  38
  39struct object_array {
  40        unsigned int nr;
  41        unsigned int alloc;
  42        struct object_array_entry {
  43                struct object *item;
  44                /*
  45                 * name or NULL.  If non-NULL, the memory pointed to
  46                 * is owned by this object *except* if it points at
  47                 * object_array_slopbuf, which is a static copy of the
  48                 * empty string.
  49                 */
  50                char *name;
  51                char *path;
  52                unsigned mode;
  53        } *objects;
  54};
  55
  56#define OBJECT_ARRAY_INIT { 0, 0, NULL }
  57
  58/*
  59 * object flag allocation:
  60 * revision.h:               0---------10                                26
  61 * fetch-pack.c:             0----5
  62 * walker.c:                 0-2
  63 * upload-pack.c:                4       11----------------19
  64 * builtin/blame.c:                        12-13
  65 * bisect.c:                                        16
  66 * bundle.c:                                        16
  67 * http-push.c:                                     16-----19
  68 * commit.c:                                        16-----19
  69 * sha1-name.c:                                              20
  70 * list-objects-filter.c:                                      21
  71 * builtin/fsck.c:           0--3
  72 * builtin/index-pack.c:                                     2021
  73 * builtin/pack-objects.c:                                   20
  74 * builtin/reflog.c:                   10--12
  75 * builtin/show-branch.c:    0-------------------------------------------26
  76 * builtin/unpack-objects.c:                                 2021
  77 */
  78#define FLAG_BITS  27
  79
  80/*
  81 * The object type is stored in 3 bits.
  82 */
  83struct object {
  84        unsigned parsed : 1;
  85        unsigned type : TYPE_BITS;
  86        unsigned flags : FLAG_BITS;
  87        struct object_id oid;
  88};
  89
  90extern const char *type_name(unsigned int type);
  91extern int type_from_string_gently(const char *str, ssize_t, int gentle);
  92#define type_from_string(str) type_from_string_gently(str, -1, 0)
  93
  94/*
  95 * Return the current number of buckets in the object hashmap.
  96 */
  97extern unsigned int get_max_object_index(void);
  98
  99/*
 100 * Return the object from the specified bucket in the object hashmap.
 101 */
 102extern struct object *get_indexed_object(unsigned int);
 103
 104/*
 105 * This can be used to see if we have heard of the object before, but
 106 * it can return "yes we have, and here is a half-initialised object"
 107 * for an object that we haven't loaded/parsed yet.
 108 *
 109 * When parsing a commit to create an in-core commit object, its
 110 * parents list holds commit objects that represent its parents, but
 111 * they are expected to be lazily initialized and do not know what
 112 * their trees or parents are yet.  When this function returns such a
 113 * half-initialised objects, the caller is expected to initialize them
 114 * by calling parse_object() on them.
 115 */
 116struct object *lookup_object(struct repository *r, const unsigned char *sha1);
 117
 118extern void *create_object(struct repository *r, const unsigned char *sha1, void *obj);
 119
 120void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet);
 121
 122/*
 123 * Returns the object, having parsed it to find out what it is.
 124 *
 125 * Returns NULL if the object is missing or corrupt.
 126 */
 127struct object *parse_object(struct repository *r, const struct object_id *oid);
 128
 129/*
 130 * Like parse_object, but will die() instead of returning NULL. If the
 131 * "name" parameter is not NULL, it is included in the error message
 132 * (otherwise, the hex object ID is given).
 133 */
 134struct object *parse_object_or_die(const struct object_id *oid, const char *name);
 135
 136/* Given the result of read_sha1_file(), returns the object after
 137 * parsing it.  eaten_p indicates if the object has a borrowed copy
 138 * of buffer and the caller should not free() it.
 139 */
 140struct object *parse_object_buffer(struct repository *r, const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
 141
 142/** Returns the object, with potentially excess memory allocated. **/
 143struct object *lookup_unknown_object(const unsigned  char *sha1);
 144
 145struct object_list *object_list_insert(struct object *item,
 146                                       struct object_list **list_p);
 147
 148int object_list_contains(struct object_list *list, struct object *obj);
 149
 150/* Object array handling .. */
 151void add_object_array(struct object *obj, const char *name, struct object_array *array);
 152void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
 153
 154/*
 155 * Returns NULL if the array is empty. Otherwise, returns the last object
 156 * after removing its entry from the array. Other resources associated
 157 * with that object are left in an unspecified state and should not be
 158 * examined.
 159 */
 160struct object *object_array_pop(struct object_array *array);
 161
 162typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
 163
 164/*
 165 * Apply want to each entry in array, retaining only the entries for
 166 * which the function returns true.  Preserve the order of the entries
 167 * that are retained.
 168 */
 169void object_array_filter(struct object_array *array,
 170                         object_array_each_func_t want, void *cb_data);
 171
 172/*
 173 * Remove from array all but the first entry with a given name.
 174 * Warning: this function uses an O(N^2) algorithm.
 175 */
 176void object_array_remove_duplicates(struct object_array *array);
 177
 178/*
 179 * Remove any objects from the array, freeing all used memory; afterwards
 180 * the array is ready to store more objects with add_object_array().
 181 */
 182void object_array_clear(struct object_array *array);
 183
 184void clear_object_flags(unsigned flags);
 185
 186/*
 187 * Clear the specified object flags from all in-core commit objects.
 188 */
 189extern void clear_commit_marks_all(unsigned int flags);
 190
 191#endif /* OBJECT_H */