Merge branch 'jk/name-decoration-alloc'

The API to allocate the structure to keep track of commit
decoration was cumbersome to use, inviting lazy code to
overallocate memory.

* jk/name-decoration-alloc:
  log-tree: use FLEX_ARRAY in name_decoration
  log-tree: make name_decoration hash static
  log-tree: make add_name_decoration a public function

Author: gitster

bisect.c

@@ -215,11 +215,12 @@ static struct commit_list *best_bisection_sorted(struct commit_list *list, int n
 	}
 	qsort(array, cnt, sizeof(*array), compare_commit_dist);
 	for (p = list, i = 0; i < cnt; i++) {
-		struct name_decoration *r = xmalloc(sizeof(*r) + 100);
+		char buf[100]; /* enough for dist=%d */
 		struct object *obj = &(array[i].commit->object);
 
-		sprintf(r->name, "dist=%d", array[i].distance);
-		r->next = add_decoration(&name_decoration, obj, r);
+		snprintf(buf, sizeof(buf), "dist=%d", array[i].distance);
+		add_name_decoration(DECORATION_NONE, buf, obj);
+
 		p->item = array[i].commit;
 		p = p->next;
 	}

commit.h

@@ -26,13 +26,25 @@ extern int save_commit_buffer;
 extern const char *commit_type;
 
 /* While we can decorate any object with a name, it's only used for commits.. */
-extern struct decoration name_decoration;
 struct name_decoration {
 	struct name_decoration *next;
 	int type;
-	char name[1];
+	char name[FLEX_ARRAY];
 };
 
+enum decoration_type {
+	DECORATION_NONE = 0,
+	DECORATION_REF_LOCAL,
+	DECORATION_REF_REMOTE,
+	DECORATION_REF_TAG,
+	DECORATION_REF_STASH,
+	DECORATION_REF_HEAD,
+	DECORATION_GRAFTED,
+};
+
+void add_name_decoration(enum decoration_type type, const char *name, struct object *obj);
+const struct name_decoration *get_name_decoration(const struct object *obj);
+
 struct commit *lookup_commit(const unsigned char *sha1);
 struct commit *lookup_commit_reference(const unsigned char *sha1);
 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,

log-tree.c

@@ -12,17 +12,7 @@
 #include "sequencer.h"
 #include "line-log.h"
 
-struct decoration name_decoration = { "object names" };
-
-enum decoration_type {
-	DECORATION_NONE = 0,
-	DECORATION_REF_LOCAL,
-	DECORATION_REF_REMOTE,
-	DECORATION_REF_TAG,
-	DECORATION_REF_STASH,
-	DECORATION_REF_HEAD,
-	DECORATION_GRAFTED,
-};
+static struct decoration name_decoration = { "object names" };
 
 static char decoration_colors[][COLOR_MAXLEN] = {
 	GIT_COLOR_RESET,
@@ -84,15 +74,20 @@ int parse_decorate_color_config(const char *var, const int ofs, const char *valu
 #define decorate_get_color_opt(o, ix) \
 	decorate_get_color((o)->use_color, ix)
 
-static void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
+void add_name_decoration(enum decoration_type type, const char *name, struct object *obj)
 {
 	int nlen = strlen(name);
-	struct name_decoration *res = xmalloc(sizeof(struct name_decoration) + nlen);
+	struct name_decoration *res = xmalloc(sizeof(*res) + nlen + 1);
 	memcpy(res->name, name, nlen + 1);
 	res->type = type;
 	res->next = add_decoration(&name_decoration, obj, res);
 }
 
+const struct name_decoration *get_name_decoration(const struct object *obj)
+{
+	return lookup_decoration(&name_decoration, obj);
+}
+
 static int add_ref_decoration(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 {
 	struct object *obj;
@@ -187,13 +182,13 @@ void format_decorations(struct strbuf *sb,
 			int use_color)
 {
 	const char *prefix;
-	struct name_decoration *decoration;
+	const struct name_decoration *decoration;
 	const char *color_commit =
 		diff_get_color(use_color, DIFF_COMMIT);
 	const char *color_reset =
 		decorate_get_color(use_color, DECORATION_NONE);
 
-	decoration = lookup_decoration(&name_decoration, &commit->object);
+	decoration = get_name_decoration(&commit->object);
 	if (!decoration)
 		return;
 	prefix = " (";

revision.c

@@ -473,7 +473,7 @@ static int rev_compare_tree(struct rev_info *revs,
 		 * If we are simplifying by decoration, then the commit
 		 * is worth showing if it has a tag pointing at it.
 		 */
-		if (lookup_decoration(&name_decoration, &commit->object))
+		if (get_name_decoration(&commit->object))
 			return REV_TREE_DIFFERENT;
 		/*
 		 * A commit that is not pointed by a tag is uninteresting