mirror of
https://github.com/git/git.git
synced 2024-11-24 02:17:02 +08:00
94d5a22cf6
We keep a static counter to set the commit index on newly allocated objects. However, since we also need to set the index on any_objects which are converted to commits, let's make the counter available as a public function. While we're moving it, let's make sure the counter is allocated as an unsigned integer to match the index field in "struct commit". Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
|
|
* 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 (which isn't needed, since
|
|
* we never free an object descriptor anyway), 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"
|
|
|
|
#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 */
|
|
};
|
|
|
|
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);
|
|
}
|
|
s->nr--;
|
|
s->count++;
|
|
ret = s->p;
|
|
s->p = (char *)s->p + node_size;
|
|
memset(ret, 0, node_size);
|
|
return ret;
|
|
}
|
|
|
|
static struct alloc_state blob_state;
|
|
void *alloc_blob_node(void)
|
|
{
|
|
struct blob *b = alloc_node(&blob_state, sizeof(struct blob));
|
|
b->object.type = OBJ_BLOB;
|
|
return b;
|
|
}
|
|
|
|
static struct alloc_state tree_state;
|
|
void *alloc_tree_node(void)
|
|
{
|
|
struct tree *t = alloc_node(&tree_state, sizeof(struct tree));
|
|
t->object.type = OBJ_TREE;
|
|
return t;
|
|
}
|
|
|
|
static struct alloc_state tag_state;
|
|
void *alloc_tag_node(void)
|
|
{
|
|
struct tag *t = alloc_node(&tag_state, sizeof(struct tag));
|
|
t->object.type = OBJ_TAG;
|
|
return t;
|
|
}
|
|
|
|
static struct alloc_state object_state;
|
|
void *alloc_object_node(void)
|
|
{
|
|
struct object *obj = alloc_node(&object_state, sizeof(union any_object));
|
|
obj->type = OBJ_NONE;
|
|
return obj;
|
|
}
|
|
|
|
static struct alloc_state commit_state;
|
|
|
|
unsigned int alloc_commit_index(void)
|
|
{
|
|
static unsigned int count;
|
|
return count++;
|
|
}
|
|
|
|
void *alloc_commit_node(void)
|
|
{
|
|
struct commit *c = alloc_node(&commit_state, sizeof(struct commit));
|
|
c->object.type = OBJ_COMMIT;
|
|
c->index = alloc_commit_index();
|
|
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, name##_state.count, name##_state.count * sizeof(type) >> 10)
|
|
|
|
void alloc_report(void)
|
|
{
|
|
REPORT(blob, struct blob);
|
|
REPORT(tree, struct tree);
|
|
REPORT(commit, struct commit);
|
|
REPORT(tag, struct tag);
|
|
REPORT(object, union any_object);
|
|
}
|