commit-reach(paint_down_to_common): plug two memory leaks
[git.git] / alloc.c
blob377e80f5dda2f80e6222f4eb2fa8c607d708cc9d
1 /*
2 * alloc.c - specialized allocator for internal objects
4 * Copyright (C) 2006 Linus Torvalds
6 * The standard malloc/free wastes too much space for objects, partly because
7 * it maintains all the allocation infrastructure, but even more because it ends
8 * up with maximal alignment because it doesn't know what the object alignment
9 * for the new allocation is.
11 #include "git-compat-util.h"
12 #include "object.h"
13 #include "blob.h"
14 #include "tree.h"
15 #include "commit.h"
16 #include "repository.h"
17 #include "tag.h"
18 #include "alloc.h"
20 #define BLOCKING 1024
22 union any_object {
23 struct object object;
24 struct blob blob;
25 struct tree tree;
26 struct commit commit;
27 struct tag tag;
30 struct alloc_state {
31 int nr; /* number of nodes left in current allocation */
32 void *p; /* first free node in current allocation */
34 /* bookkeeping of allocations */
35 void **slabs;
36 int slab_nr, slab_alloc;
39 struct alloc_state *allocate_alloc_state(void)
41 return xcalloc(1, sizeof(struct alloc_state));
44 void clear_alloc_state(struct alloc_state *s)
46 while (s->slab_nr > 0) {
47 s->slab_nr--;
48 free(s->slabs[s->slab_nr]);
51 FREE_AND_NULL(s->slabs);
54 static inline void *alloc_node(struct alloc_state *s, size_t node_size)
56 void *ret;
58 if (!s->nr) {
59 s->nr = BLOCKING;
60 s->p = xmalloc(BLOCKING * node_size);
62 ALLOC_GROW(s->slabs, s->slab_nr + 1, s->slab_alloc);
63 s->slabs[s->slab_nr++] = s->p;
65 s->nr--;
66 ret = s->p;
67 s->p = (char *)s->p + node_size;
68 memset(ret, 0, node_size);
70 return ret;
73 void *alloc_blob_node(struct repository *r)
75 struct blob *b = alloc_node(r->parsed_objects->blob_state, sizeof(struct blob));
76 b->object.type = OBJ_BLOB;
77 return b;
80 void *alloc_tree_node(struct repository *r)
82 struct tree *t = alloc_node(r->parsed_objects->tree_state, sizeof(struct tree));
83 t->object.type = OBJ_TREE;
84 return t;
87 void *alloc_tag_node(struct repository *r)
89 struct tag *t = alloc_node(r->parsed_objects->tag_state, sizeof(struct tag));
90 t->object.type = OBJ_TAG;
91 return t;
94 void *alloc_object_node(struct repository *r)
96 struct object *obj = alloc_node(r->parsed_objects->object_state, sizeof(union any_object));
97 obj->type = OBJ_NONE;
98 return obj;
102 * The returned count is to be used as an index into commit slabs,
103 * that are *NOT* maintained per repository, and that is why a single
104 * global counter is used.
106 static unsigned int alloc_commit_index(void)
108 static unsigned int parsed_commits_count;
109 return parsed_commits_count++;
112 void init_commit_node(struct commit *c)
114 c->object.type = OBJ_COMMIT;
115 c->index = alloc_commit_index();
118 void *alloc_commit_node(struct repository *r)
120 struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
121 init_commit_node(c);
122 return c;