File: alloc.c

package info (click to toggle)
git 1:2.20.1-2+deb10u3
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 45,676 kB
  • sloc: ansic: 210,769; sh: 180,432; perl: 29,102; tcl: 21,663; python: 6,143; makefile: 3,700; sed: 189; php: 120; asm: 98; csh: 45; ruby: 24; lisp: 12
file content (134 lines) | stat: -rw-r--r-- 3,136 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * alloc.c  - specialized allocator for internal objects
 *
 * Copyright (C) 2006 Linus Torvalds
 *
 * The standard malloc/free wastes too much space for objects, partly because
 * it maintains all the allocation infrastructure, but even more because it ends
 * up with maximal alignment because it doesn't know what the object alignment
 * for the new allocation is.
 */
#include "cache.h"
#include "object.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "tag.h"
#include "alloc.h"

#define BLOCKING 1024

union any_object {
	struct object object;
	struct blob blob;
	struct tree tree;
	struct commit commit;
	struct tag tag;
};

struct alloc_state {
	int count; /* total number of nodes allocated */
	int nr;    /* number of nodes left in current allocation */
	void *p;   /* first free node in current allocation */

	/* bookkeeping of allocations */
	void **slabs;
	int slab_nr, slab_alloc;
};

struct alloc_state *allocate_alloc_state(void)
{
	return xcalloc(1, sizeof(struct alloc_state));
}

void clear_alloc_state(struct alloc_state *s)
{
	while (s->slab_nr > 0) {
		s->slab_nr--;
		free(s->slabs[s->slab_nr]);
	}

	FREE_AND_NULL(s->slabs);
}

static inline void *alloc_node(struct alloc_state *s, size_t node_size)
{
	void *ret;

	if (!s->nr) {
		s->nr = BLOCKING;
		s->p = xmalloc(BLOCKING * node_size);

		ALLOC_GROW(s->slabs, s->slab_nr + 1, s->slab_alloc);
		s->slabs[s->slab_nr++] = s->p;
	}
	s->nr--;
	s->count++;
	ret = s->p;
	s->p = (char *)s->p + node_size;
	memset(ret, 0, node_size);

	return ret;
}

void *alloc_blob_node(struct repository *r)
{
	struct blob *b = alloc_node(r->parsed_objects->blob_state, sizeof(struct blob));
	b->object.type = OBJ_BLOB;
	return b;
}

void *alloc_tree_node(struct repository *r)
{
	struct tree *t = alloc_node(r->parsed_objects->tree_state, sizeof(struct tree));
	t->object.type = OBJ_TREE;
	return t;
}

void *alloc_tag_node(struct repository *r)
{
	struct tag *t = alloc_node(r->parsed_objects->tag_state, sizeof(struct tag));
	t->object.type = OBJ_TAG;
	return t;
}

void *alloc_object_node(struct repository *r)
{
	struct object *obj = alloc_node(r->parsed_objects->object_state, sizeof(union any_object));
	obj->type = OBJ_NONE;
	return obj;
}

unsigned int alloc_commit_index(struct repository *r)
{
	return r->parsed_objects->commit_count++;
}

void *alloc_commit_node(struct repository *r)
{
	struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
	c->object.type = OBJ_COMMIT;
	c->index = alloc_commit_index(r);
	c->graph_pos = COMMIT_NOT_FROM_GRAPH;
	c->generation = GENERATION_NUMBER_INFINITY;
	return c;
}

static void report(const char *name, unsigned int count, size_t size)
{
	fprintf(stderr, "%10s: %8u (%"PRIuMAX" kB)\n",
			name, count, (uintmax_t) size);
}

#define REPORT(name, type)	\
    report(#name, r->parsed_objects->name##_state->count, \
		  r->parsed_objects->name##_state->count * sizeof(type) >> 10)

void alloc_report(struct repository *r)
{
	REPORT(blob, struct blob);
	REPORT(tree, struct tree);
	REPORT(commit, struct commit);
	REPORT(tag, struct tag);
	REPORT(object, union any_object);
}