diff --color-moved: stop clearing potential moved blocks

phillipwood · gitster · commit eec7f53b3150 · 2021-12-09T13:24:06.000-08:00
moved_block_clear() was introduced in 74d156f ("diff --color-moved-ws: fix double free crash", 2018-10-04) to free the memory that was allocated when initializing a potential moved block. However since 21536d0 ("diff --color-moved-ws: modify allow-indentation-change", 2018-11-23) initializing a potential moved block no longer allocates any memory. Up until the last commit we were relying on moved_block_clear() to set the `match` pointer to NULL when a block stopped matching, but since that commit we do not clear a moved block that does not match so it does not make sense to clear them elsewhere. Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk> Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/diff.c b/diff.c
@@ -807,11 +807,6 @@ struct moved_block {
 	int wsd; /* The whitespace delta of this block */
 };
 
-static void moved_block_clear(struct moved_block *b)
-{
-	memset(b, 0, sizeof(*b));
-}
-
 #define INDENT_BLANKLINE INT_MIN
 
 static void fill_es_indent_data(struct emitted_diff_symbol *es)
@@ -1128,8 +1123,6 @@ static void mark_color_as_moved(struct diff_options *o,
 		}
 
 		if (pmb_nr && (!match || l->s != moved_symbol)) {
-			int i;
-
 			if (!adjust_last_block(o, n, block_length) &&
 			    block_length > 1) {
 				/*
@@ -1139,8 +1132,6 @@ static void mark_color_as_moved(struct diff_options *o,
 				match = NULL;
 				n -= block_length;
 			}
-			for(i = 0; i < pmb_nr; i++)
-				moved_block_clear(&pmb[i]);
 			pmb_nr = 0;
 			block_length = 0;
 			flipped_block = 0;
@@ -1193,8 +1184,6 @@ static void mark_color_as_moved(struct diff_options *o,
 	}
 	adjust_last_block(o, n, block_length);
 
-	for(n = 0; n < pmb_nr; n++)
-		moved_block_clear(&pmb[n]);
 	free(pmb);
 }
 
