Instead of relying on commit->util to store the source string, let the
user provide a commit-slab to store the source strings in.

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

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/fast-export.c | 14 +++++++++-----
 builtin/log.c         |  7 +++++--
 log-tree.c            |  8 ++++++--
 revision.c            | 17 +++++++++++++----
 revision.h            |  5 ++++-
 5 files changed, 37 insertions(+), 14 deletions(-)

diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 530df12f05..092e29583e 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -21,6 +21,7 @@
 #include "quote.h"
 #include "remote.h"
 #include "blob.h"
+#include "commit-slab.h"
 
 static const char *fast_export_usage[] = {
        N_("git fast-export [rev-list-opts]"),
@@ -38,6 +39,7 @@ static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
 static struct refspec *refspecs;
 static int refspecs_nr;
 static int anonymize;
+static struct source_slab source_slab;
 
 static int parse_opt_signed_tag_mode(const struct option *opt,
                                     const char *arg, int unset)
@@ -590,7 +592,7 @@ static void handle_commit(struct commit *commit, struct 
rev_info *rev,
                if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
                        export_blob(&diff_queued_diff.queue[i]->two->oid);
 
-       refname = commit->util;
+       refname = *source_slab_peek(&source_slab, commit);
        if (anonymize) {
                refname = anonymize_refname(refname);
                anonymize_ident_line(&committer, &committer_end);
@@ -862,10 +864,11 @@ static void get_tags_and_duplicates(struct 
rev_cmdline_info *info)
                 * This ref will not be updated through a commit, lets make
                 * sure it gets properly updated eventually.
                 */
-               if (commit->util || commit->object.flags & SHOWN)
+               if (*source_slab_at(&source_slab, commit) ||
+                   commit->object.flags & SHOWN)
                        string_list_append(&extra_refs, full_name)->util = 
commit;
-               if (!commit->util)
-                       commit->util = full_name;
+               if (!*source_slab_at(&source_slab, commit))
+                       *source_slab_at(&source_slab, commit) = full_name;
        }
 }
 
@@ -1029,8 +1032,9 @@ int cmd_fast_export(int argc, const char **argv, const 
char *prefix)
        git_config(git_default_config, NULL);
 
        init_revisions(&revs, prefix);
+       init_source_slab(&source_slab);
        revs.topo_order = 1;
-       revs.show_source = 1;
+       revs.source_slab = &source_slab;
        revs.rewrite_parents = 1;
        argc = parse_options(argc, argv, prefix, options, fast_export_usage,
                        PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
diff --git a/builtin/log.c b/builtin/log.c
index 71f68a3e4f..0d199ebd5d 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -148,6 +148,7 @@ static void cmd_log_init_finish(int argc, const char 
**argv, const char *prefix,
        static struct string_list decorate_refs_include = 
STRING_LIST_INIT_NODUP;
        struct decoration_filter decoration_filter = {&decorate_refs_include,
                                                      &decorate_refs_exclude};
+       static struct source_slab source_slab;
 
        const struct option builtin_log_options[] = {
                OPT__QUIET(&quiet, N_("suppress diff output")),
@@ -194,8 +195,10 @@ static void cmd_log_init_finish(int argc, const char 
**argv, const char *prefix,
            rev->diffopt.filter || rev->diffopt.flags.follow_renames)
                rev->always_show_header = 0;
 
-       if (source)
-               rev->show_source = 1;
+       if (source) {
+               init_source_slab(&source_slab);
+               rev->source_slab = &source_slab;
+       }
 
        if (mailmap) {
                rev->mailmap = xcalloc(1, sizeof(struct string_list));
diff --git a/log-tree.c b/log-tree.c
index d1c0bedf24..d36a945fc4 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -295,8 +295,12 @@ void show_decorations(struct rev_info *opt, struct commit 
*commit)
 {
        struct strbuf sb = STRBUF_INIT;
 
-       if (opt->show_source && commit->util)
-               fprintf(opt->diffopt.file, "\t%s", (char *) commit->util);
+       if (opt->source_slab) {
+               char **slot = source_slab_peek(opt->source_slab, commit);
+
+               if (slot && *slot)
+                       fprintf(opt->diffopt.file, "\t%s", *slot);
+       }
        if (!opt->show_decorations)
                return;
        format_decorations(&sb, commit, opt->diffopt.use_color);
diff --git a/revision.c b/revision.c
index 1cff11833e..41b56f789d 100644
--- a/revision.c
+++ b/revision.c
@@ -255,14 +255,19 @@ static struct commit *handle_commit(struct rev_info *revs,
         */
        if (object->type == OBJ_COMMIT) {
                struct commit *commit = (struct commit *)object;
+
                if (parse_commit(commit) < 0)
                        die("unable to parse commit %s", name);
                if (flags & UNINTERESTING) {
                        mark_parents_uninteresting(commit);
                        revs->limited = 1;
                }
-               if (revs->show_source && !commit->util)
-                       commit->util = xstrdup(name);
+               if (revs->source_slab) {
+                       char **slot = source_slab_at(revs->source_slab, commit);
+
+                       if (!*slot)
+                               *slot = xstrdup(name);
+               }
                return commit;
        }
 
@@ -814,8 +819,12 @@ static int add_parents_to_list(struct rev_info *revs, 
struct commit *commit,
                        }
                        return -1;
                }
-               if (revs->show_source && !p->util)
-                       p->util = commit->util;
+               if (revs->source_slab) {
+                       char **slot = source_slab_at(revs->source_slab, p);
+
+                       if (!*slot)
+                               *slot = *source_slab_at(revs->source_slab, 
commit);
+               }
                p->object.flags |= left_flag;
                if (!(p->object.flags & SEEN)) {
                        p->object.flags |= SEEN;
diff --git a/revision.h b/revision.h
index b8c47b98e2..72404e2599 100644
--- a/revision.h
+++ b/revision.h
@@ -6,6 +6,7 @@
 #include "notes.h"
 #include "pretty.h"
 #include "diff.h"
+#include "commit-slab.h"
 
 /* Remember to update object flag allocation in object.h */
 #define SEEN           (1u<<0)
@@ -29,6 +30,7 @@ struct rev_info;
 struct log_info;
 struct string_list;
 struct saved_parents;
+define_commit_slab(source_slab, char *);
 
 struct rev_cmdline_info {
        unsigned int nr;
@@ -111,7 +113,6 @@ struct rev_info {
                        right_only:1,
                        rewrite_parents:1,
                        print_parents:1,
-                       show_source:1,
                        show_decorations:1,
                        reverse:1,
                        reverse_output_stage:1,
@@ -224,6 +225,8 @@ struct rev_info {
 
        struct commit_list *previous_parents;
        const char *break_bar;
+
+       struct source_slab *source_slab;
 };
 
 extern int ref_excluded(struct string_list *, const char *path);
-- 
2.17.0.705.g3525833791

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