Revision: 17569
Author: [email protected]
Date: Thu Nov 7 16:07:19 2013 UTC
Log: Make HCapturedObjects non-deletable for DCE.
[email protected]
BUG=v8:2987
TEST=mjsunit/regress/regress-2987
Review URL: https://codereview.chromium.org/64433002
http://code.google.com/p/v8/source/detail?r=17569
Added:
/branches/bleeding_edge/test/mjsunit/regress/regress-2987.js
Modified:
/branches/bleeding_edge/src/hydrogen-instructions.h
=======================================
--- /dev/null
+++ /branches/bleeding_edge/test/mjsunit/regress/regress-2987.js Thu Nov 7
16:07:19 2013 UTC
@@ -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 --dead-code-elimination
+
+// This tests that stores on captured objects are correctly tracked even
+// when DCE is enabled. We cannot delete simulations of captured objects
+// that are still needed to replay the environment correctly.
+
+function constructor() {
+ this.x = 0;
+}
+
+var deopt = { deopt:false };
+function boogeyman(mode, value) {
+ var object = new constructor();
+ if (mode) {
+ object.x = 1;
+ } else {
+ object.x = 2;
+ }
+ deopt.deopt;
+ assertEquals(value, object.x);
+}
+
+boogeyman(true, 1);
+boogeyman(true, 1);
+boogeyman(false, 2);
+boogeyman(false, 2);
+%OptimizeFunctionOnNextCall(boogeyman);
+boogeyman(false, 2);
+delete deopt.deopt;
+boogeyman(false, 2);
=======================================
--- /branches/bleeding_edge/src/hydrogen-instructions.h Thu Nov 7 13:43:03
2013 UTC
+++ /branches/bleeding_edge/src/hydrogen-instructions.h Thu Nov 7 16:07:19
2013 UTC
@@ -3259,9 +3259,6 @@
// List of values tracked by this marker.
ZoneList<HValue*> values_;
-
- private:
- virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return true; }
};
@@ -3289,6 +3286,8 @@
set_representation(Representation::Tagged());
SetFlag(kIsArguments);
}
+
+ virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return true; }
};
@@ -3325,6 +3324,11 @@
private:
int capture_id_;
+
+ // Note that we cannot DCE captured objects as they are used to replay
+ // the environment. This method is here as an explicit reminder.
+ // TODO(mstarzinger): Turn HSimulates into full snapshots maybe?
+ virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return false; }
};
--
--
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