rebase: allow --merge option to handle patches merged upstream
[git] / alloc.c
1 /*
2  * alloc.c  - specialized allocator for internal objects
3  *
4  * Copyright (C) 2006 Linus Torvalds
5  *
6  * The standard malloc/free wastes too much space for objects, partly because
7  * it maintains all the allocation infrastructure (which isn't needed, since
8  * we never free an object descriptor anyway), but even more because it ends
9  * up with maximal alignment because it doesn't know what the object alignment
10  * for the new allocation is.
11  */
12 #include "cache.h"
13 #include "object.h"
14 #include "blob.h"
15 #include "tree.h"
16 #include "commit.h"
17 #include "tag.h"
18
19 #define BLOCKING 1024
20
21 #define DEFINE_ALLOCATOR(name)                                  \
22 static unsigned int name##_allocs;                              \
23 struct name *alloc_##name##_node(void)                          \
24 {                                                               \
25         static int nr;                                          \
26         static struct name *block;                              \
27                                                                 \
28         if (!nr) {                                              \
29                 nr = BLOCKING;                                  \
30                 block = xcalloc(BLOCKING, sizeof(struct name)); \
31         }                                                       \
32         nr--;                                                   \
33         name##_allocs++;                                        \
34         return block++;                                         \
35 }
36
37 DEFINE_ALLOCATOR(blob)
38 DEFINE_ALLOCATOR(tree)
39 DEFINE_ALLOCATOR(commit)
40 DEFINE_ALLOCATOR(tag)
41
42 #define REPORT(name)    \
43         fprintf(stderr, "%10s: %8u (%zu kB)\n", #name, name##_allocs, name##_allocs*sizeof(struct name) >> 10)
44
45 void alloc_report(void)
46 {
47         REPORT(blob);
48         REPORT(tree);
49         REPORT(commit);
50         REPORT(tag);
51 }