0b75e5bf22
The alloc_report() function has been orphaned since its introduction
in 855419f764 (Add specialized object allocator, 2006-06-19), it
appears to have been used for demonstration purposes in that commit
message.
These might be handy to manually use in a debugger, but keeping them
and the "count" member of "alloc_state" just for that doesn't seem
worth it.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
123 lines
2.7 KiB
C
123 lines
2.7 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, 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 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--;
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* The returned count is to be used as an index into commit slabs,
|
|
* that are *NOT* maintained per repository, and that is why a single
|
|
* global counter is used.
|
|
*/
|
|
static unsigned int alloc_commit_index(void)
|
|
{
|
|
static unsigned int parsed_commits_count;
|
|
return parsed_commits_count++;
|
|
}
|
|
|
|
void init_commit_node(struct commit *c)
|
|
{
|
|
c->object.type = OBJ_COMMIT;
|
|
c->index = alloc_commit_index();
|
|
}
|
|
|
|
void *alloc_commit_node(struct repository *r)
|
|
{
|
|
struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
|
|
init_commit_node(c);
|
|
return c;
|
|
}
|