Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 122 insertions, 0 deletions

diff --git a/alloc.c b/alloc.c
new file mode 100644
index 0000000..27f697e
--- /dev/null
+++ b/alloc.c
@@ -0,0 +1,122 @@
+/*
+ * 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;
+}