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Diffstat (limited to 'deps/v8/test/mjsunit/regress/regress-1708.js')
-rw-r--r-- | deps/v8/test/mjsunit/regress/regress-1708.js | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/regress/regress-1708.js b/deps/v8/test/mjsunit/regress/regress-1708.js new file mode 100644 index 0000000000..ab50e07864 --- /dev/null +++ b/deps/v8/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]; + } +})(); |