Merge branch 'jk/alloc-commit-id-maint' into maint

* jk/alloc-commit-id-maint:
  diff-tree: avoid lookup_unknown_object
  object_as_type: set commit index
  alloc: factor out commit index
  add object_as_type helper for casting objects
  parse_object_buffer: do not set object type
  move setting of object->type to alloc_* functions
  alloc: write out allocator definitions
  alloc.c: remove the alloc_raw_commit_node() function

Author: gitster

alloc.c

@@ -18,25 +18,6 @@
 
 #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;
@@ -45,17 +26,73 @@ union any_object {
 	struct tag tag;
 };
 
-DEFINE_ALLOCATOR(blob, struct blob)
-DEFINE_ALLOCATOR(tree, struct tree)
-DEFINE_ALLOCATOR(raw_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 */
+};
+
+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);
+	}
+	s->nr--;
+	s->count++;
+	ret = s->p;
+	s->p = (char *)s->p + node_size;
+	memset(ret, 0, node_size);
+	return ret;
+}
+
+static struct alloc_state blob_state;
+void *alloc_blob_node(void)
+{
+	struct blob *b = alloc_node(&blob_state, sizeof(struct blob));
+	b->object.type = OBJ_BLOB;
+	return b;
+}
+
+static struct alloc_state tree_state;
+void *alloc_tree_node(void)
+{
+	struct tree *t = alloc_node(&tree_state, sizeof(struct tree));
+	t->object.type = OBJ_TREE;
+	return t;
+}
+
+static struct alloc_state tag_state;
+void *alloc_tag_node(void)
+{
+	struct tag *t = alloc_node(&tag_state, sizeof(struct tag));
+	t->object.type = OBJ_TAG;
+	return t;
+}
+
+static struct alloc_state object_state;
+void *alloc_object_node(void)
+{
+	struct object *obj = alloc_node(&object_state, sizeof(union any_object));
+	obj->type = OBJ_NONE;
+	return obj;
+}
+
+static struct alloc_state commit_state;
+
+unsigned int alloc_commit_index(void)
+{
+	static unsigned int count;
+	return count++;
+}
 
 void *alloc_commit_node(void)
 {
-	static int commit_count;
-	struct commit *c = alloc_raw_commit_node();
-	c->index = commit_count++;
+	struct commit *c = alloc_node(&commit_state, sizeof(struct commit));
+	c->object.type = OBJ_COMMIT;
+	c->index = alloc_commit_index();
 	return c;
 }
 
@@ -66,13 +103,13 @@ static void report(const char *name, unsigned int count, size_t size)
 }
 
 #define REPORT(name, type)	\
-    report(#name, name##_allocs, name##_allocs * sizeof(type) >> 10)
+    report(#name, name##_state.count, name##_state.count * sizeof(type) >> 10)
 
 void alloc_report(void)
 {
 	REPORT(blob, struct blob);
 	REPORT(tree, struct tree);
-	REPORT(raw_commit, struct commit);
+	REPORT(commit, struct commit);
 	REPORT(tag, struct tag);
 	REPORT(object, union any_object);
 }

blob.c

@@ -7,15 +7,8 @@ struct blob *lookup_blob(const unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
 	if (!obj)
-		return create_object(sha1, OBJ_BLOB, alloc_blob_node());
-	if (!obj->type)
-		obj->type = OBJ_BLOB;
-	if (obj->type != OBJ_BLOB) {
-		error("Object %s is a %s, not a blob",
-		      sha1_to_hex(sha1), typename(obj->type));
-		return NULL;
-	}
-	return (struct blob *) obj;
+		return create_object(sha1, alloc_blob_node());
+	return object_as_type(obj, OBJ_BLOB, 0);
 }
 
 int parse_blob_buffer(struct blob *item, void *buffer, unsigned long size)

builtin/blame.c

@@ -2041,7 +2041,6 @@ static struct commit *fake_working_tree_commit(struct diff_options *opt,
 	commit = alloc_commit_node();
 	commit->object.parsed = 1;
 	commit->date = now;
-	commit->object.type = OBJ_COMMIT;
 	parent_tail = &commit->parents;
 
 	if (!resolve_ref_unsafe("HEAD", head_sha1, 1, NULL))

builtin/diff-tree.c

@@ -72,9 +72,7 @@ static int diff_tree_stdin(char *line)
 	line[len-1] = 0;
 	if (get_sha1_hex(line, sha1))
 		return -1;
-	obj = lookup_unknown_object(sha1);
-	if (!obj || !obj->parsed)
-		obj = parse_object(sha1);
+	obj = parse_object(sha1);
 	if (!obj)
 		return -1;
 	if (obj->type == OBJ_COMMIT)

cache.h

@@ -1354,6 +1354,7 @@ extern void *alloc_commit_node(void);
 extern void *alloc_tag_node(void);
 extern void *alloc_object_node(void);
 extern void alloc_report(void);
+extern unsigned int alloc_commit_index(void);
 
 /* trace.c */
 __attribute__((format (printf, 1, 2)))

commit.c

@@ -18,27 +18,14 @@ int save_commit_buffer = 1;
 
 const char *commit_type = "commit";
 
-static struct commit *check_commit(struct object *obj,
-				   const unsigned char *sha1,
-				   int quiet)
-{
-	if (obj->type != OBJ_COMMIT) {
-		if (!quiet)
-			error("Object %s is a %s, not a commit",
-			      sha1_to_hex(sha1), typename(obj->type));
-		return NULL;
-	}
-	return (struct commit *) obj;
-}
-
 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
 					      int quiet)
 {
 	struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
 
 	if (!obj)
 		return NULL;
-	return check_commit(obj, sha1, quiet);
+	return object_as_type(obj, OBJ_COMMIT, quiet);
 }
 
 struct commit *lookup_commit_reference(const unsigned char *sha1)
@@ -61,13 +48,9 @@ struct commit *lookup_commit_or_die(const unsigned char *sha1, const char *ref_n
 struct commit *lookup_commit(const unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
-	if (!obj) {
-		struct commit *c = alloc_commit_node();
-		return create_object(sha1, OBJ_COMMIT, c);
-	}
-	if (!obj->type)
-		obj->type = OBJ_COMMIT;
-	return check_commit(obj, sha1, 0);
+	if (!obj)
+		return create_object(sha1, alloc_commit_node());
+	return object_as_type(obj, OBJ_COMMIT, 0);
 }
 
 struct commit *lookup_commit_reference_by_name(const char *name)

object.c

@@ -141,13 +141,12 @@ static void grow_object_hash(void)
 	obj_hash_size = new_hash_size;
 }
 
-void *create_object(const unsigned char *sha1, int type, void *o)
+void *create_object(const unsigned char *sha1, void *o)
 {
 	struct object *obj = o;
 
 	obj->parsed = 0;
 	obj->used = 0;
-	obj->type = type;
 	obj->flags = 0;
 	hashcpy(obj->sha1, sha1);
 
@@ -159,11 +158,30 @@ void *create_object(const unsigned char *sha1, int type, void *o)
 	return obj;
 }
 
+void *object_as_type(struct object *obj, enum object_type type, int quiet)
+{
+	if (obj->type == type)
+		return obj;
+	else if (obj->type == OBJ_NONE) {
+		if (type == OBJ_COMMIT)
+			((struct commit *)obj)->index = alloc_commit_index();
+		obj->type = type;
+		return obj;
+	}
+	else {
+		if (!quiet)
+			error("object %s is a %s, not a %s",
+			      sha1_to_hex(obj->sha1),
+			      typename(obj->type), typename(type));
+		return NULL;
+	}
+}
+
 struct object *lookup_unknown_object(const unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
 	if (!obj)
-		obj = create_object(sha1, OBJ_NONE, alloc_object_node());
+		obj = create_object(sha1, alloc_object_node());
 	return obj;
 }
 
@@ -214,8 +232,6 @@ struct object *parse_object_buffer(const unsigned char *sha1, enum object_type t
 		warning("object %s has unknown type id %d", sha1_to_hex(sha1), type);
 		obj = NULL;
 	}
-	if (obj && obj->type == OBJ_NONE)
-		obj->type = type;
 	return obj;
 }
 

object.h

@@ -79,7 +79,9 @@ extern struct object *get_indexed_object(unsigned int);
  */
 struct object *lookup_object(const unsigned char *sha1);
 
-extern void *create_object(const unsigned char *sha1, int type, void *obj);
+extern void *create_object(const unsigned char *sha1, void *obj);
+
+void *object_as_type(struct object *obj, enum object_type type, int quiet);
 
 /*
  * Returns the object, having parsed it to find out what it is.

refs.c

@@ -1520,9 +1520,8 @@ static enum peel_status peel_object(const unsigned char *name, unsigned char *sh
 
 	if (o->type == OBJ_NONE) {
 		int type = sha1_object_info(name, NULL);
-		if (type < 0)
+		if (type < 0 || !object_as_type(o, type, 0))
 			return PEEL_INVALID;
-		o->type = type;
 	}
 
 	if (o->type != OBJ_TAG)

tag.c

@@ -40,15 +40,8 @@ struct tag *lookup_tag(const unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
 	if (!obj)
-		return create_object(sha1, OBJ_TAG, alloc_tag_node());
-	if (!obj->type)
-		obj->type = OBJ_TAG;
-	if (obj->type != OBJ_TAG) {
-		error("Object %s is a %s, not a tag",
-		      sha1_to_hex(sha1), typename(obj->type));
-		return NULL;
-	}
-	return (struct tag *) obj;
+		return create_object(sha1, alloc_tag_node());
+	return object_as_type(obj, OBJ_TAG, 0);
 }
 
 static unsigned long parse_tag_date(const char *buf, const char *tail)