* array.c (rb_ary_shift): should clear shifting top element.

  [ruby-talk:216055]

* array.c (rb_ary_shift): avoid creating shared object if array
  size is small.


git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_8@11016 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 2 deletions

diff --git a/array.c b/array.c
index 6e6778d68..6df82f7fa 100644
--- a/array.c
+++ b/array.c
@@ -501,8 +501,16 @@ rb_ary_shift(ary)
     rb_ary_modify_check(ary);
     if (RARRAY(ary)->len == 0) return Qnil;
     top = RARRAY(ary)->ptr[0];
-    ary_make_shared(ary);
-    RARRAY(ary)->ptr++;		/* shift ptr */
+    if (RARRAY_LEN(ary) < ARY_DEFAULT_SIZE) {
+	MEMMOVE(RARRAY_PTR(ary), RARRAY_PTR(ary)+1, VALUE, RARRAY_LEN(ary));
+    }
+    else {
+	if (!FL_TEST(ary, ELTS_SHARED)) {
+	    RARRAY(ary)->ptr[0] = Qnil;
+	}
+	ary_make_shared(ary);
+	RARRAY(ary)->ptr++;		/* shift ptr */
+    }
     RARRAY(ary)->len--;
 
     return top;