Ensure reload of elements pointer in StoreFastDoubleElement stub.

R=mstarzinger@chromium.org
TEST=test/mjsunit/regress/regress-125515.js
BUG=chromium:125515

Review URL: https://chromiumcodereview.appspot.com/10260014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11479 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects-inl.h

@@ -1392,7 +1392,9 @@ void JSObject::initialize_properties() {
 
 
 void JSObject::initialize_elements() {
-  ASSERT(map()->has_fast_elements() || map()->has_fast_smi_only_elements());
+  ASSERT(map()->has_fast_elements() ||
+         map()->has_fast_smi_only_elements() ||
+         map()->has_fast_double_elements());
   ASSERT(!GetHeap()->InNewSpace(GetHeap()->empty_fixed_array()));
   WRITE_FIELD(this, kElementsOffset, GetHeap()->empty_fixed_array());
 }

src/x64/stub-cache-x64.cc

@@ -3802,6 +3802,7 @@ void KeyedStoreStubCompiler::GenerateStoreFastDoubleElement(
 
     // Increment the length of the array.
     __ Move(FieldOperand(rdx, JSArray::kLengthOffset), Smi::FromInt(1));
+    __ movq(rdi, FieldOperand(rdx, JSObject::kElementsOffset));
     __ jmp(&finish_store);
 
     __ bind(&check_capacity);

test/mjsunit/regress/regress-125515.js

+// Copyright 2012 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.
+
+// Flags: --expose-gc --debug-code
+
+function test(a) {
+  a[0] = 1.5;
+  assertEquals(0, a.length = 0);
+}
+a = new Array();
+test(a);
+test(a);
+// Make sure that a ends up in old space
+gc();
+gc();
+test(a);
+test(a);