Add NO_C99_FORMAT to support older compilers.
[git/git.git] / alloc.c
CommitLineData
855419f7
LT
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) \
22static unsigned int name##_allocs; \
23struct 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
37DEFINE_ALLOCATOR(blob)
38DEFINE_ALLOCATOR(tree)
39DEFINE_ALLOCATOR(commit)
40DEFINE_ALLOCATOR(tag)
41
579d1fbf
RJ
42#ifdef NO_C99_FORMAT
43#define SZ_FMT "%u"
44#else
45#define SZ_FMT "%zu"
46#endif
47
48static void report(const char* name, unsigned int count, size_t size)
49{
50 fprintf(stderr, "%10s: %8u (" SZ_FMT " kB)\n", name, count, size);
51}
52
53#undef SZ_FMT
54
855419f7 55#define REPORT(name) \
579d1fbf 56 report(#name, name##_allocs, name##_allocs*sizeof(struct name) >> 10)
855419f7
LT
57
58void alloc_report(void)
59{
60 REPORT(blob);
61 REPORT(tree);
62 REPORT(commit);
63 REPORT(tag);
64}