Merge V8 at 3.9.24.13
Bug: 5688872
Change-Id: Id0aa8d23375030494d3189c31774059c0f5398fc
diff --git a/test/mjsunit/regress/regress-1708.js b/test/mjsunit/regress/regress-1708.js
new file mode 100644
index 0000000..ab50e07
--- /dev/null
+++ b/test/mjsunit/regress/regress-1708.js
@@ -0,0 +1,63 @@
+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Regression test of a very rare corner case where left-trimming an
+// array caused invalid marking bit patterns on lazily swept pages.
+
+// Flags: --expose-gc --noincremental-marking --max-new-space-size 1000
+
+(function() {
+ var head = new Array(1);
+ var tail = head;
+
+ // Fill heap to increase old-space size and trigger lazy sweeping on
+ // some of the old-space pages.
+ for (var i = 0; i < 200; i++) {
+ tail[1] = new Array(1000);
+ tail = tail[1];
+ }
+ array = new Array(100);
+ gc(); gc();
+
+ // At this point "array" should have been promoted to old-space and be
+ // located in a lazy swept page with intact marking bits. Now shift
+ // the array to trigger left-trimming operations.
+ assertEquals(100, array.length);
+ for (var i = 0; i < 50; i++) {
+ array.shift();
+ }
+ assertEquals(50, array.length);
+
+ // At this point "array" should have been trimmed from the left with
+ // marking bits being correctly transfered to the new object start.
+ // Scavenging operations cause lazy sweeping to advance and verify
+ // that marking bit patterns are still sane.
+ for (var i = 0; i < 200; i++) {
+ tail[1] = new Array(1000);
+ tail = tail[1];
+ }
+})();