Merge branch 'ml/trace'
[git/git.git] / object.c
CommitLineData
8f1d2e6f 1#include "cache.h"
175785e5 2#include "object.h"
e9eefa67
DB
3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
e9eefa67 6#include "tag.h"
175785e5 7
0556a11a
LT
8static struct object **obj_hash;
9static int nr_objs, obj_hash_size;
fc046a75
LT
10
11unsigned int get_max_object_index(void)
12{
0556a11a 13 return obj_hash_size;
fc046a75
LT
14}
15
16struct object *get_indexed_object(unsigned int idx)
17{
0556a11a 18 return obj_hash[idx];
fc046a75 19}
175785e5 20
885a86ab
LT
21const char *type_names[] = {
22 "none", "blob", "tree", "commit", "bad"
23};
24
0556a11a
LT
25static unsigned int hash_obj(struct object *obj, unsigned int n)
26{
27 unsigned int hash = *(unsigned int *)obj->sha1;
28 return hash % n;
29}
30
31static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
32{
33 int j = hash_obj(obj, size);
34
35 while (hash[j]) {
36 j++;
37 if (j >= size)
38 j = 0;
39 }
40 hash[j] = obj;
41}
42
070879ca
JS
43static int hashtable_index(const unsigned char *sha1)
44{
2b796360
JH
45 unsigned int i;
46 memcpy(&i, sha1, sizeof(unsigned int));
0556a11a 47 return (int)(i % obj_hash_size);
070879ca
JS
48}
49
0556a11a 50struct object *lookup_object(const unsigned char *sha1)
175785e5 51{
2b796360 52 int i;
0556a11a 53 struct object *obj;
175785e5 54
0556a11a
LT
55 if (!obj_hash)
56 return NULL;
175785e5 57
2b796360 58 i = hashtable_index(sha1);
0556a11a
LT
59 while ((obj = obj_hash[i]) != NULL) {
60 if (!memcmp(sha1, obj->sha1, 20))
61 break;
070879ca 62 i++;
0556a11a 63 if (i == obj_hash_size)
070879ca
JS
64 i = 0;
65 }
0556a11a 66 return obj;
175785e5
DB
67}
68
0556a11a 69static void grow_object_hash(void)
175785e5 70{
0556a11a
LT
71 int i;
72 int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
73 struct object **new_hash;
74
75 new_hash = calloc(new_hash_size, sizeof(struct object *));
76 for (i = 0; i < obj_hash_size; i++) {
77 struct object *obj = obj_hash[i];
78 if (!obj)
79 continue;
80 insert_obj_hash(obj, new_hash, new_hash_size);
81 }
82 free(obj_hash);
83 obj_hash = new_hash;
84 obj_hash_size = new_hash_size;
175785e5
DB
85}
86
5d6ccf5c 87void created_object(const unsigned char *sha1, struct object *obj)
175785e5 88{
175785e5 89 obj->parsed = 0;
175785e5 90 obj->used = 0;
0556a11a
LT
91 obj->type = TYPE_NONE;
92 obj->flags = 0;
93 memcpy(obj->sha1, sha1, 20);
175785e5 94
0556a11a
LT
95 if (obj_hash_size - 1 <= nr_objs * 2)
96 grow_object_hash();
175785e5 97
0556a11a 98 insert_obj_hash(obj, obj_hash, obj_hash_size);
175785e5
DB
99 nr_objs++;
100}
101
89e4202f
DB
102struct object *lookup_object_type(const unsigned char *sha1, const char *type)
103{
66e481b0
DB
104 if (!type) {
105 return lookup_unknown_object(sha1);
106 } else if (!strcmp(type, blob_type)) {
89e4202f
DB
107 return &lookup_blob(sha1)->object;
108 } else if (!strcmp(type, tree_type)) {
109 return &lookup_tree(sha1)->object;
110 } else if (!strcmp(type, commit_type)) {
111 return &lookup_commit(sha1)->object;
112 } else if (!strcmp(type, tag_type)) {
113 return &lookup_tag(sha1)->object;
114 } else {
115 error("Unknown type %s", type);
116 return NULL;
117 }
118}
119
66e481b0
DB
120union any_object {
121 struct object object;
122 struct commit commit;
123 struct tree tree;
124 struct blob blob;
125 struct tag tag;
126};
127
128struct object *lookup_unknown_object(const unsigned char *sha1)
129{
130 struct object *obj = lookup_object(sha1);
131 if (!obj) {
90321c10 132 union any_object *ret = xcalloc(1, sizeof(*ret));
66e481b0 133 created_object(sha1, &ret->object);
885a86ab 134 ret->object.type = TYPE_NONE;
66e481b0
DB
135 return &ret->object;
136 }
137 return obj;
138}
139
5d6ccf5c 140struct object *parse_object(const unsigned char *sha1)
e9eefa67 141{
c4584ae3
JH
142 unsigned long size;
143 char type[20];
144 void *buffer = read_sha1_file(sha1, type, &size);
145 if (buffer) {
bd2c39f5 146 struct object *obj;
c4584ae3 147 if (check_sha1_signature(sha1, buffer, size, type) < 0)
e9eefa67 148 printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
8e440259 149 if (!strcmp(type, blob_type)) {
bd2c39f5
NP
150 struct blob *blob = lookup_blob(sha1);
151 parse_blob_buffer(blob, buffer, size);
152 obj = &blob->object;
8e440259 153 } else if (!strcmp(type, tree_type)) {
bd2c39f5 154 struct tree *tree = lookup_tree(sha1);
bd2c39f5 155 obj = &tree->object;
136f2e54
LT
156 if (!tree->object.parsed) {
157 parse_tree_buffer(tree, buffer, size);
158 buffer = NULL;
159 }
8e440259 160 } else if (!strcmp(type, commit_type)) {
bd2c39f5
NP
161 struct commit *commit = lookup_commit(sha1);
162 parse_commit_buffer(commit, buffer, size);
bd1e17e2
LT
163 if (!commit->buffer) {
164 commit->buffer = buffer;
165 buffer = NULL;
166 }
bd2c39f5 167 obj = &commit->object;
8e440259 168 } else if (!strcmp(type, tag_type)) {
bd2c39f5
NP
169 struct tag *tag = lookup_tag(sha1);
170 parse_tag_buffer(tag, buffer, size);
171 obj = &tag->object;
e9eefa67 172 } else {
bd2c39f5 173 obj = NULL;
e9eefa67 174 }
bd2c39f5
NP
175 free(buffer);
176 return obj;
e9eefa67
DB
177 }
178 return NULL;
179}
66e481b0
DB
180
181struct object_list *object_list_insert(struct object *item,
182 struct object_list **list_p)
183{
184 struct object_list *new_list = xmalloc(sizeof(struct object_list));
185 new_list->item = item;
186 new_list->next = *list_p;
187 *list_p = new_list;
188 return new_list;
189}
190
680bab3d
DB
191void object_list_append(struct object *item,
192 struct object_list **list_p)
193{
194 while (*list_p) {
195 list_p = &((*list_p)->next);
196 }
197 *list_p = xmalloc(sizeof(struct object_list));
198 (*list_p)->next = NULL;
199 (*list_p)->item = item;
200}
201
66e481b0
DB
202unsigned object_list_length(struct object_list *list)
203{
204 unsigned ret = 0;
205 while (list) {
206 list = list->next;
207 ret++;
208 }
209 return ret;
210}
211
212int object_list_contains(struct object_list *list, struct object *obj)
213{
214 while (list) {
215 if (list->item == obj)
216 return 1;
217 list = list->next;
218 }
219 return 0;
220}
1f1e895f
LT
221
222void add_object_array(struct object *obj, const char *name, struct object_array *array)
223{
224 unsigned nr = array->nr;
225 unsigned alloc = array->alloc;
226 struct object_array_entry *objects = array->objects;
227
228 if (nr >= alloc) {
229 alloc = (alloc + 32) * 2;
230 objects = xrealloc(objects, alloc * sizeof(*objects));
231 array->alloc = alloc;
232 array->objects = objects;
233 }
234 objects[nr].item = obj;
235 objects[nr].name = name;
236 array->nr = ++nr;
237}