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Bug 932800 - Don't optimize string[x] GETELEM in Ion if x is not a number. r=h4writer

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This commit is contained in:
Jan de Mooij 2013-11-01 16:10:14 +01:00
parent 984bfd7477
commit e8f23fc815
1 changed files with 6 additions and 1 deletions
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7
js/src/jit/IonBuilder.cpp
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@ -6565,7 +6565,12 @@ IonBuilder::getElemTryString(bool *emitted, MDefinition *obj, MDefinition *index
{
JS_ASSERT(*emitted == false);
if (obj->type() != MIRType_String)
if (obj->type() != MIRType_String || !IsNumberType(index->type()))
return true;
// If the index is expected to be out-of-bounds, don't optimize to avoid
// frequent bailouts.
if (bytecodeTypes(pc)->hasType(types::Type::UndefinedType()))
return true;
// Emit fast path for string[index].