From: jkummerow@chromium.org <jkummerow@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 23 Oct 2013 15:15:15 +0000 (+0000)
Subject: Fix HObjectAccess for loads from migrating prototypes
X-Git-Tag: upstream/4.7.83~11985
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8259439ae88bdb078a3786c03c2a134c14aa22a6;p=platform%2Fupstream%2Fv8.git

Fix HObjectAccess for loads from migrating prototypes

BUG=chromium:305309
R=danno@chromium.org

Review URL: https://codereview.chromium.org/35173005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---

diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index b0d85e6..77dab3d 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -4759,6 +4759,9 @@ bool HOptimizedGraphBuilder::PropertyAccessInfo::LookupInPrototypes() {
   Handle<Map> map = map_;
   while (map->prototype()->IsJSObject()) {
     holder_ = handle(JSObject::cast(map->prototype()));
+    if (holder_->map()->is_deprecated()) {
+      JSObject::TryMigrateInstance(holder_);
+    }
     map = Handle<Map>(holder_->map());
     if (!CanInlinePropertyAccess(*map)) {
       lookup_.NotFound();
diff --git a/test/mjsunit/regress/regress-crbug-305309.js b/test/mjsunit/regress/regress-crbug-305309.js
new file mode 100644
index 0000000..cd89bed
--- /dev/null
+++ b/test/mjsunit/regress/regress-crbug-305309.js
@@ -0,0 +1,49 @@
+// Copyright 2013 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: --allow-natives-syntax
+
+function BadProto() {
+  this.constant_function = function() {};
+  this.one = 1;
+  this.two = 2;
+}
+var b1 = new BadProto();
+var b2 = new BadProto();
+
+function Ctor() {}
+Ctor.prototype = b1;
+var a = new Ctor();
+
+function Two(x) {
+  return x.two;
+}
+assertEquals(2, Two(a));
+assertEquals(2, Two(a));
+b2.constant_function = "no longer constant!";
+%OptimizeFunctionOnNextCall(Two);
+assertEquals(2, Two(a));