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Bug 913749 - Mark fallible unbox instructions as guards. r=h4writer

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--HG--
extra : rebase_source : f064535983782dcd52791f977f16a21d83603381
This commit is contained in:
Jan de Mooij 2013-09-13 10:09:11 +02:00
parent cc8d27d8d0
commit d00023d255
2 changed files with 21 additions and 1 deletions
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20
js/src/jit-test/tests/ion/bug913749.js Normal file
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@ -0,0 +1,20 @@
y = Float32Array(11);
x = [];
Object.defineProperty(x, 18, {
get: (function() {
y.length;
}),
});
this.toSource();
y = undefined;
for (var i = 0; i < 3; i++) {
try {
x.toString();
assertEq(0, 1);
} catch (e) {
assertEq(e.message, "y is undefined");
}
}

2
js/src/jit/MIR.h
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@ -2197,7 +2197,7 @@ class MUnbox : public MUnaryInstruction, public BoxInputsPolicy
setResultTypeSet(ins->resultTypeSet());
setMovable();
if (mode_ == TypeBarrier)
if (mode_ == TypeBarrier || mode_ == Fallible)
setGuard();
bailoutKind_ = kind;