Make HCapturedObjects non-deletable for DCE.

R=jkummerow@chromium.org
BUG=v8:2987
TEST=mjsunit/regress/regress-2987

Review URL: https://codereview.chromium.org/64433002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17569 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent f3acd446
...@@ -3259,9 +3259,6 @@ class HDematerializedObject : public HInstruction { ...@@ -3259,9 +3259,6 @@ class HDematerializedObject : public HInstruction {
// List of values tracked by this marker. // List of values tracked by this marker.
ZoneList<HValue*> values_; ZoneList<HValue*> values_;
private:
virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return true; }
}; };
...@@ -3289,6 +3286,8 @@ class HArgumentsObject V8_FINAL : public HDematerializedObject { ...@@ -3289,6 +3286,8 @@ class HArgumentsObject V8_FINAL : public HDematerializedObject {
set_representation(Representation::Tagged()); set_representation(Representation::Tagged());
SetFlag(kIsArguments); SetFlag(kIsArguments);
} }
virtual bool IsDeletable() const V8_FINAL V8_OVERRIDE { return true; }
}; };
...@@ -3325,6 +3324,11 @@ class HCapturedObject V8_FINAL : public HDematerializedObject { ...@@ -3325,6 +3324,11 @@ class HCapturedObject V8_FINAL : public HDematerializedObject {
private: private:
int capture_id_; 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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// 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);
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