f4609b896f
This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because there is some breakage in the git build related to the netrc credentials helper which someone has taken care of in nixpkgs. The stable channel is not used for anything other than git, so this should be fine. Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb
143 lines
3.2 KiB
C
143 lines
3.2 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, 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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#include "alloc.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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/* bookkeeping of allocations */
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void **slabs;
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int slab_nr, slab_alloc;
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};
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struct alloc_state *allocate_alloc_state(void)
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{
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return xcalloc(1, sizeof(struct alloc_state));
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}
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void clear_alloc_state(struct alloc_state *s)
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{
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while (s->slab_nr > 0) {
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s->slab_nr--;
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free(s->slabs[s->slab_nr]);
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}
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FREE_AND_NULL(s->slabs);
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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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ALLOC_GROW(s->slabs, s->slab_nr + 1, s->slab_alloc);
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s->slabs[s->slab_nr++] = s->p;
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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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void *alloc_blob_node(struct repository *r)
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{
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struct blob *b = alloc_node(r->parsed_objects->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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void *alloc_tree_node(struct repository *r)
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{
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struct tree *t = alloc_node(r->parsed_objects->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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void *alloc_tag_node(struct repository *r)
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{
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struct tag *t = alloc_node(r->parsed_objects->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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void *alloc_object_node(struct repository *r)
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{
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struct object *obj = alloc_node(r->parsed_objects->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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/*
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* The returned count is to be used as an index into commit slabs,
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* that are *NOT* maintained per repository, and that is why a single
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* global counter is used.
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*/
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static unsigned int alloc_commit_index(void)
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{
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static unsigned int parsed_commits_count;
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return parsed_commits_count++;
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}
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void init_commit_node(struct commit *c)
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{
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c->object.type = OBJ_COMMIT;
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c->index = alloc_commit_index();
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}
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void *alloc_commit_node(struct repository *r)
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{
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struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
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init_commit_node(c);
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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, r->parsed_objects->name##_state->count, \
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r->parsed_objects->name##_state->count * sizeof(type) >> 10)
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void alloc_report(struct repository *r)
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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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