Andrew's git - gitweb.git/blob

   1#ifndef OBJECT_H
   2#define OBJECT_H
   3
   4#include "cache.h"
   5
   6struct buffer_slab;
   7
   8struct parsed_object_pool {
   9        struct object **obj_hash;
  10        int nr_objs, obj_hash_size;
  11
  12        /* TODO: migrate alloc_states to mem-pool? */
  13        struct alloc_state *blob_state;
  14        struct alloc_state *tree_state;
  15        struct alloc_state *commit_state;
  16        struct alloc_state *tag_state;
  17        struct alloc_state *object_state;
  18        unsigned commit_count;
  19
  20        /* parent substitutions from .git/info/grafts and .git/shallow */
  21        struct commit_graft **grafts;
  22        int grafts_alloc, grafts_nr;
  23
  24        int is_shallow;
  25        struct stat_validity *shallow_stat;
  26        char *alternate_shallow_file;
  27
  28        int commit_graft_prepared;
  29
  30        struct buffer_slab *buffer_slab;
  31};
  32
  33struct parsed_object_pool *parsed_object_pool_new(void);
  34void parsed_object_pool_clear(struct parsed_object_pool *o);
  35
  36struct object_list {
  37        struct object *item;
  38        struct object_list *next;
  39};
  40
  41struct object_array {
  42        unsigned int nr;
  43        unsigned int alloc;
  44        struct object_array_entry {
  45                struct object *item;
  46                /*
  47                 * name or NULL.  If non-NULL, the memory pointed to
  48                 * is owned by this object *except* if it points at
  49                 * object_array_slopbuf, which is a static copy of the
  50                 * empty string.
  51                 */
  52                char *name;
  53                char *path;
  54                unsigned mode;
  55        } *objects;
  56};
  57
  58#define OBJECT_ARRAY_INIT { 0, 0, NULL }
  59
  60/*
  61 * object flag allocation:
  62 * revision.h:               0---------10                              25----28
  63 * fetch-pack.c:             01
  64 * negotiator/default.c:       2--5
  65 * walker.c:                 0-2
  66 * upload-pack.c:                4       11-----14  16-----19
  67 * builtin/blame.c:                        12-13
  68 * bisect.c:                                        16
  69 * bundle.c:                                        16
  70 * http-push.c:                                     16-----19
  71 * commit-reach.c:                                15-------19
  72 * sha1-name.c:                                              20
  73 * list-objects-filter.c:                                      21
  74 * builtin/fsck.c:           0--3
  75 * builtin/index-pack.c:                                     2021
  76 * builtin/pack-objects.c:                                   20
  77 * builtin/reflog.c:                   10--12
  78 * builtin/show-branch.c:    0-------------------------------------------26
  79 * builtin/unpack-objects.c:                                 2021
  80 */
  81#define FLAG_BITS  29
  82
  83/*
  84 * The object type is stored in 3 bits.
  85 */
  86struct object {
  87        unsigned parsed : 1;
  88        unsigned type : TYPE_BITS;
  89        unsigned flags : FLAG_BITS;
  90        struct object_id oid;
  91};
  92
  93extern const char *type_name(unsigned int type);
  94extern int type_from_string_gently(const char *str, ssize_t, int gentle);
  95#define type_from_string(str) type_from_string_gently(str, -1, 0)
  96
  97/*
  98 * Return the current number of buckets in the object hashmap.
  99 */
 100extern unsigned int get_max_object_index(void);
 101
 102/*
 103 * Return the object from the specified bucket in the object hashmap.
 104 */
 105extern struct object *get_indexed_object(unsigned int);
 106
 107/*
 108 * This can be used to see if we have heard of the object before, but
 109 * it can return "yes we have, and here is a half-initialised object"
 110 * for an object that we haven't loaded/parsed yet.
 111 *
 112 * When parsing a commit to create an in-core commit object, its
 113 * parents list holds commit objects that represent its parents, but
 114 * they are expected to be lazily initialized and do not know what
 115 * their trees or parents are yet.  When this function returns such a
 116 * half-initialised objects, the caller is expected to initialize them
 117 * by calling parse_object() on them.
 118 */
 119struct object *lookup_object(struct repository *r, const unsigned char *sha1);
 120
 121extern void *create_object(struct repository *r, const unsigned char *sha1, void *obj);
 122
 123void *object_as_type(struct repository *r, struct object *obj, enum object_type type, int quiet);
 124
 125/*
 126 * Returns the object, having parsed it to find out what it is.
 127 *
 128 * Returns NULL if the object is missing or corrupt.
 129 */
 130struct object *parse_object(struct repository *r, const struct object_id *oid);
 131
 132/*
 133 * Like parse_object, but will die() instead of returning NULL. If the
 134 * "name" parameter is not NULL, it is included in the error message
 135 * (otherwise, the hex object ID is given).
 136 */
 137struct object *parse_object_or_die(const struct object_id *oid, const char *name);
 138
 139/* Given the result of read_sha1_file(), returns the object after
 140 * parsing it.  eaten_p indicates if the object has a borrowed copy
 141 * of buffer and the caller should not free() it.
 142 */
 143struct object *parse_object_buffer(struct repository *r, const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
 144
 145/** Returns the object, with potentially excess memory allocated. **/
 146struct object *lookup_unknown_object(const unsigned  char *sha1);
 147
 148struct object_list *object_list_insert(struct object *item,
 149                                       struct object_list **list_p);
 150
 151int object_list_contains(struct object_list *list, struct object *obj);
 152
 153/* Object array handling .. */
 154void add_object_array(struct object *obj, const char *name, struct object_array *array);
 155void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
 156
 157/*
 158 * Returns NULL if the array is empty. Otherwise, returns the last object
 159 * after removing its entry from the array. Other resources associated
 160 * with that object are left in an unspecified state and should not be
 161 * examined.
 162 */
 163struct object *object_array_pop(struct object_array *array);
 164
 165typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
 166
 167/*
 168 * Apply want to each entry in array, retaining only the entries for
 169 * which the function returns true.  Preserve the order of the entries
 170 * that are retained.
 171 */
 172void object_array_filter(struct object_array *array,
 173                         object_array_each_func_t want, void *cb_data);
 174
 175/*
 176 * Remove from array all but the first entry with a given name.
 177 * Warning: this function uses an O(N^2) algorithm.
 178 */
 179void object_array_remove_duplicates(struct object_array *array);
 180
 181/*
 182 * Remove any objects from the array, freeing all used memory; afterwards
 183 * the array is ready to store more objects with add_object_array().
 184 */
 185void object_array_clear(struct object_array *array);
 186
 187void clear_object_flags(unsigned flags);
 188
 189/*
 190 * Clear the specified object flags from all in-core commit objects.
 191 */
 192extern void clear_commit_marks_all(unsigned int flags);
 193
 194#endif /* OBJECT_H */