git-upload-pack: More efficient usage of the has_sha1 array

This patch is based on Junio's proposal. It marks parents of common revs
so that they do not clutter up the has_sha1 array.

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/upload-pack.c b/upload-pack.c
index 878254d..660d7c4 100644 (file)
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -3,9 +3,11 @@
 #include "pkt-line.h"
 #include "tag.h"
 #include "object.h"
+#include "commit.h"
 
 static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
 
+#define THEY_HAVE (1U << 0)
 #define OUR_REF (1U << 1)
 #define WANTED (1U << 2)
 #define MAX_HAS 256
@@ -89,15 +91,27 @@ static void create_pack_file(void)
 
 static int got_sha1(char *hex, unsigned char *sha1)
 {
-       int nr;
        if (get_sha1_hex(hex, sha1))
                die("git-upload-pack: expected SHA1 object, got '%s'", hex);
        if (!has_sha1_file(sha1))
                return 0;
-       nr = nr_has;
-       if (nr < MAX_HAS) {
-               memcpy(has_sha1[nr], sha1, 20);
-               nr_has = nr+1;
+       if (nr_has < MAX_HAS) {
+               struct object *o = lookup_object(sha1);
+               if (!(o && o->parsed))
+                       o = parse_object(sha1);
+               if (!o)
+                       die("oops (%s)", sha1_to_hex(sha1));
+               if (o->type == commit_type) {
+                       struct commit_list *parents;
+                       if (o->flags & THEY_HAVE)
+                               return 0;
+                       o->flags |= THEY_HAVE;
+                       for (parents = ((struct commit*)o)->parents;
+                            parents;
+                            parents = parents->next)
+                               parents->item->object.flags |= THEY_HAVE;
+               }
+               memcpy(has_sha1[nr_has++], sha1, 20);
        }
        return 1;
 }
@@ -108,6 +122,9 @@ static int get_common_commits(void)
        unsigned char sha1[20];
        int len;
 
+       track_object_refs = 0;
+       save_commit_buffer = 0;
+
        for(;;) {
                len = packet_read_line(0, line, sizeof(line));
                reset_timeout();