log: use commit-slab in prepare_bases() instead of commit->util

It's done so that commit->util can be removed. See more explanation in
the commit that removes commit->util.

Signed-off-by: Junio C Hamano <[email protected]>

Author: pclouds

builtin/log.c

@@ -28,6 +28,7 @@
 #include "mailmap.h"
 #include "gpg-interface.h"
 #include "progress.h"
+#include "commit-slab.h"
 
 #define MAIL_DEFAULT_WRAP 72
 
@@ -1340,6 +1341,8 @@ static struct commit *get_base_commit(const char *base_commit,
 	return base;
 }
 
+define_commit_slab(commit_base, int);
+
 static void prepare_bases(struct base_tree_info *bases,
 			  struct commit *base,
 			  struct commit **list,
@@ -1348,11 +1351,13 @@ static void prepare_bases(struct base_tree_info *bases,
 	struct commit *commit;
 	struct rev_info revs;
 	struct diff_options diffopt;
+	struct commit_base commit_base;
 	int i;
 
 	if (!base)
 		return;
 
+	init_commit_base(&commit_base);
 	diff_setup(&diffopt);
 	diffopt.flags.recursive = 1;
 	diff_setup_done(&diffopt);
@@ -1365,7 +1370,7 @@ static void prepare_bases(struct base_tree_info *bases,
 	for (i = 0; i < total; i++) {
 		list[i]->object.flags &= ~UNINTERESTING;
 		add_pending_object(&revs, &list[i]->object, "rev_list");
-		list[i]->util = (void *)1;
+		*commit_base_at(&commit_base, list[i]) = 1;
 	}
 	base->object.flags |= UNINTERESTING;
 	add_pending_object(&revs, &base->object, "base");
@@ -1379,7 +1384,7 @@ static void prepare_bases(struct base_tree_info *bases,
 	while ((commit = get_revision(&revs)) != NULL) {
 		struct object_id oid;
 		struct object_id *patch_id;
-		if (commit->util)
+		if (*commit_base_at(&commit_base, commit))
 			continue;
 		if (commit_patch_id(commit, &diffopt, &oid, 0))
 			die(_("cannot get patch id"));
@@ -1388,6 +1393,7 @@ static void prepare_bases(struct base_tree_info *bases,
 		oidcpy(patch_id, &oid);
 		bases->nr_patch_id++;
 	}
+	clear_commit_base(&commit_base);
 }
 
 static void print_bases(struct base_tree_info *bases, FILE *file)