object.h

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