revision: make tree comparison functions take commits rather than trees

This will make it easier to do various clever things that don't depend
on the pure tree contents.  It also makes the parameter passing much
simpler - the callers doesn't really look at trees anywhere else, and
it's really the function that should look at the low-level details.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/revision.c b/revision.c
index d45f05a00c8065669c232069caabf35634e6b9c2..56b09eb315cc96cb2611fe8497299b293c4783e3 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -294,8 +294,11 @@ static void file_change(struct diff_options *options,
        DIFF_OPT_SET(options, HAS_CHANGES);
 }
 
-static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
+static int rev_compare_tree(struct rev_info *revs, struct commit *parent, struct commit *commit)
 {
+       struct tree *t1 = parent->tree;
+       struct tree *t2 = commit->tree;
+
        if (!t1)
                return REV_TREE_NEW;
        if (!t2)
@@ -308,12 +311,13 @@ static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree
        return tree_difference;
 }
 
-static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
+static int rev_same_tree_as_empty(struct rev_info *revs, struct commit *commit)
 {
        int retval;
        void *tree;
        unsigned long size;
        struct tree_desc empty, real;
+       struct tree *t1 = commit->tree;
 
        if (!t1)
                return 0;
@@ -347,7 +351,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                return;
 
        if (!commit->parents) {
-               if (rev_same_tree_as_empty(revs, commit->tree))
+               if (rev_same_tree_as_empty(revs, commit))
                        commit->object.flags |= TREESAME;
                return;
        }
@@ -367,7 +371,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                        die("cannot simplify commit %s (because of %s)",
                            sha1_to_hex(commit->object.sha1),
                            sha1_to_hex(p->object.sha1));
-               switch (rev_compare_tree(revs, p->tree, commit->tree)) {
+               switch (rev_compare_tree(revs, p, commit)) {
                case REV_TREE_SAME:
                        tree_same = 1;
                        if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
@@ -387,7 +391,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
 
                case REV_TREE_NEW:
                        if (revs->remove_empty_trees &&
-                           rev_same_tree_as_empty(revs, p->tree)) {
+                           rev_same_tree_as_empty(revs, p)) {
                                /* We are adding all the specified
                                 * paths from this parent, so the
                                 * history beyond this parent is not