object.h

   1 #ifndef OBJECT_H
   2 #define OBJECT_H
   3
   4 #include "cache.h"
   5
   6 struct buffer_slab;
   7
   8 struct 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
  33 struct parsed_object_pool *parsed_object_pool_new(void);
  34 void parsed_object_pool_clear(struct parsed_object_pool *o);
  35
  36 struct object_list {
  37         struct object *item;
  38         struct object_list *next;
  39 };
  40
  41 struct 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  */
  86 struct object {
  87         unsigned parsed : 1;
  88         unsigned type : TYPE_BITS;
  89         unsigned flags : FLAG_BITS;
  90         struct object_id oid;
  91 };
  92
  93 extern const char *type_name(unsigned int type);
  94 extern 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  */
 100 extern unsigned int get_max_object_index(void);
 101
 102 /*
 103  * Return the object from the specified bucket in the object hashmap.
 104  */
 105 extern 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  */
 119 struct object *lookup_object(struct repository *r, const unsigned char *sha1);
 120
 121 extern void *create_object(struct repository *r, const unsigned char *sha1, void *obj);
 122
 123 void *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  */
 130 struct 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  */
 137 struct 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  */
 143 struct 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. **/
 146 struct object *lookup_unknown_object(const unsigned  char *sha1);
 147
 148 struct object_list *object_list_insert(struct object *item,
 149                                        struct object_list **list_p);
 150
 151 int object_list_contains(struct object_list *list, struct object *obj);
 152
 153 /* Object array handling .. */
 154 void add_object_array(struct object *obj, const char *name, struct object_array *array);
 155 void 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  */
 163 struct object *object_array_pop(struct object_array *array);
 164
 165 typedef 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  */
 172 void 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  */
 179 void 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  */
 185 void object_array_clear(struct object_array *array);
 186
 187 void clear_object_flags(unsigned flags);
 188
 189 /*
 190  * Clear the specified object flags from all in-core commit objects.
 191  */
 192 extern void clear_commit_marks_all(unsigned int flags);
 193
 194 #endif /* OBJECT_H */