From b353b1d1314ca3826f21cdfb1367a67ef4ca8dee Mon Sep 17 00:00:00 2001
From: "verwaest@chromium.org"
 <verwaest@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 22 May 2013 15:33:53 +0000
Subject: [PATCH] Don't allow copying holes to fields.

R=jkummerow@chromium.org

Review URL: https://chromiumcodereview.appspot.com/15745006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14753 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/hydrogen-instructions.h                        |  1 +
 test/mjsunit/regress/regress-copy-hole-to-field.js | 57 ++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 test/mjsunit/regress/regress-copy-hole-to-field.js

diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index d06e318..c6a5111 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5593,6 +5593,7 @@ class HStoreNamedField: public HTemplateInstruction<2> {
       SetGVNFlag(kChangesBackingStoreFields);
       SetGVNFlag(kDependsOnNewSpacePromotion);
     }
+    SetFlag(kDeoptimizeOnUndefined);
   }
 
   DECLARE_CONCRETE_INSTRUCTION(StoreNamedField)
diff --git a/test/mjsunit/regress/regress-copy-hole-to-field.js b/test/mjsunit/regress/regress-copy-hole-to-field.js
new file mode 100644
index 0000000..fa3db92
--- /dev/null
+++ b/test/mjsunit/regress/regress-copy-hole-to-field.js
@@ -0,0 +1,57 @@
+// 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
+
+// Copy a hole from HOLEY_DOUBLE to double field.
+var a = [1.5,,1.7];
+var o = {a:1.8};
+
+function f1(o,a,i) {
+  o.a = a[i];
+}
+
+f1(o,a,0);
+f1(o,a,0);
+assertEquals(1.5, o.a);
+%OptimizeFunctionOnNextCall(f1);
+f1(o,a,1);
+assertEquals(undefined, o.a);
+
+// Copy a hole from HOLEY_SMI to smi field.
+var a = [1,,3];
+var o = {ab:5};
+
+function f2(o,a,i) {
+  o.ab = a[i];
+}
+
+f2(o,a,0);
+f2(o,a,0);
+%OptimizeFunctionOnNextCall(f2);
+f2(o,a,1);
+assertEquals(undefined, o.ab);
-- 
2.7.4