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Bug 835417 part 3. Add the notion of aliasing DOM stuff to MIR and flag MGetDOMProperty with the right alias set if it's pure. r=jandem

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This commit is contained in:
Boris Zbarsky 2013-01-29 17:53:53 -05:00
parent ae32f60c9d
commit a58b9ae840
1 changed files with 12 additions and 4 deletions
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16
js/src/ion/MIR.h
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@ -196,10 +196,11 @@ class AliasSet {
DynamicSlot = 1 << 2, // A member of obj->slots.
FixedSlot = 1 << 3, // A member of obj->fixedSlots().
TypedArrayElement = 1 << 4, // A typed array element.
Last = TypedArrayElement,
DOMProperty = 1 << 5, // A DOM property
Last = DOMProperty,
Any = Last | (Last - 1),
NumCategories = 5,
NumCategories = 6,
// Indicates load or store.
Store_ = 1 << 31
@ -5394,7 +5395,7 @@ class MGetDOMProperty
setOperand(1, guard);
// We are movable iff the jitinfo says we can be.
if (jitinfo->isConstant)
if (jitinfo->isPure)
setMovable();
setResultType(MIRType_Value);
@ -5422,6 +5423,9 @@ class MGetDOMProperty
bool isDomConstant() const {
return info_->isConstant;
}
bool isDomPure() const {
return info_->isPure;
}
MDefinition *object() {
return getOperand(0);
}
@ -5431,7 +5435,7 @@ class MGetDOMProperty
}
bool congruentTo(MDefinition *const &ins) const {
if (!isDomConstant())
if (!isDomPure())
return false;
if (!ins->isGetDOMProperty())
@ -5449,6 +5453,10 @@ class MGetDOMProperty
// conflict with anything
if (isDomConstant())
return AliasSet::None();
// Pure DOM attributes can only alias things that alias the world or
// explicitly alias DOM properties.
if (isDomPure())
return AliasSet::Load(AliasSet::DOMProperty);
return AliasSet::Store(AliasSet::Any);
}