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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>
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
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* alloc.c - specialized allocator for internal objects
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*
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* Copyright (C) 2006 Linus Torvalds
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*
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* The standard malloc/free wastes too much space for objects, partly because
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* it maintains all the allocation infrastructure (which isn't needed, since
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* we never free an object descriptor anyway), but even more because it ends
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* up with maximal alignment because it doesn't know what the object alignment
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* for the new allocation is.
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*/
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#include "cache.h"
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#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "commit.h"
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#include "tag.h"
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#define BLOCKING 1024
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union any_object {
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struct object object;
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struct blob blob;
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struct tree tree;
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struct commit commit;
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struct tag tag;
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};
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struct alloc_state {
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int count; /* total number of nodes allocated */
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int nr; /* number of nodes left in current allocation */
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void *p; /* first free node in current allocation */
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};
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static inline void *alloc_node(struct alloc_state *s, size_t node_size)
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{
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void *ret;
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if (!s->nr) {
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s->nr = BLOCKING;
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s->p = xmalloc(BLOCKING * node_size);
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}
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s->nr--;
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s->count++;
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ret = s->p;
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s->p = (char *)s->p + node_size;
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memset(ret, 0, node_size);
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return ret;
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}
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static struct alloc_state blob_state;
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void *alloc_blob_node(void)
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{
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struct blob *b = alloc_node(&blob_state, sizeof(struct blob));
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b->object.type = OBJ_BLOB;
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return b;
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}
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static struct alloc_state tree_state;
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void *alloc_tree_node(void)
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{
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struct tree *t = alloc_node(&tree_state, sizeof(struct tree));
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t->object.type = OBJ_TREE;
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return t;
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}
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static struct alloc_state tag_state;
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void *alloc_tag_node(void)
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{
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struct tag *t = alloc_node(&tag_state, sizeof(struct tag));
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t->object.type = OBJ_TAG;
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return t;
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}
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static struct alloc_state object_state;
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void *alloc_object_node(void)
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{
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struct object *obj = alloc_node(&object_state, sizeof(union any_object));
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obj->type = OBJ_NONE;
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return obj;
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}
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static struct alloc_state commit_state;
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unsigned int alloc_commit_index(void)
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{
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static unsigned int count;
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return count++;
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}
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void *alloc_commit_node(void)
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{
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struct commit *c = alloc_node(&commit_state, sizeof(struct commit));
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c->object.type = OBJ_COMMIT;
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c->index = alloc_commit_index();
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return c;
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}
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static void report(const char *name, unsigned int count, size_t size)
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{
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fprintf(stderr, "%10s: %8u (%"PRIuMAX" kB)\n",
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name, count, (uintmax_t) size);
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}
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#define REPORT(name, type) \
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report(#name, name##_state.count, name##_state.count * sizeof(type) >> 10)
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void alloc_report(void)
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{
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REPORT(blob, struct blob);
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REPORT(tree, struct tree);
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REPORT(commit, struct commit);
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REPORT(tag, struct tag);
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REPORT(object, union any_object);
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}
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