* 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
+ * 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 "tree.h"
#include "commit.h"
#include "tag.h"
+#include "alloc.h"
#define BLOCKING 1024
-#define DEFINE_ALLOCATOR(name, type) \
-static unsigned int name##_allocs; \
-void *alloc_##name##_node(void) \
-{ \
- static int nr; \
- static type *block; \
- void *ret; \
- \
- if (!nr) { \
- nr = BLOCKING; \
- block = xmalloc(BLOCKING * sizeof(type)); \
- } \
- nr--; \
- name##_allocs++; \
- ret = block++; \
- memset(ret, 0, sizeof(type)); \
- return ret; \
-}
-
union any_object {
struct object object;
struct blob blob;
struct tag tag;
};
-DEFINE_ALLOCATOR(blob, struct blob)
-DEFINE_ALLOCATOR(tree, struct tree)
-DEFINE_ALLOCATOR(commit, struct commit)
-DEFINE_ALLOCATOR(tag, struct tag)
-DEFINE_ALLOCATOR(object, union any_object)
+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;
+}
+
+static unsigned int alloc_commit_index(struct repository *r)
+{
+ return r->parsed_objects->commit_count++;
+}
+
+void init_commit_node(struct repository *r, struct commit *c)
+{
+ c->object.type = OBJ_COMMIT;
+ c->index = alloc_commit_index(r);
+ c->graph_pos = COMMIT_NOT_FROM_GRAPH;
+ c->generation = GENERATION_NUMBER_INFINITY;
+}
+
+void *alloc_commit_node(struct repository *r)
+{
+ struct commit *c = alloc_node(r->parsed_objects->commit_state, sizeof(struct commit));
+ init_commit_node(r, c);
+ return c;
+}
static void report(const char *name, unsigned int count, size_t size)
{
name, count, (uintmax_t) size);
}
-#define REPORT(name) \
- report(#name, name##_allocs, name##_allocs * sizeof(struct name) >> 10)
+#define REPORT(name, type) \
+ report(#name, r->parsed_objects->name##_state->count, \
+ r->parsed_objects->name##_state->count * sizeof(type) >> 10)
-void alloc_report(void)
+void alloc_report(struct repository *r)
{
- REPORT(blob);
- REPORT(tree);
- REPORT(commit);
- REPORT(tag);
+ REPORT(blob, struct blob);
+ REPORT(tree, struct tree);
+ REPORT(commit, struct commit);
+ REPORT(tag, struct tag);
+ REPORT(object, union any_object);
}