bool
TypeInferenceOracle::elementReadIsTypedArray(RawScript script, jsbytecode *pc, int *arrayType)
{
// Check whether the object is a typed array and index is int32 or double.
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 1);
StackTypeSet *id = script->analysis()->poppedTypes(pc, 0);
JSValueType idType = id->getKnownTypeTag();
if (idType != JSVAL_TYPE_INT32 && idType != JSVAL_TYPE_DOUBLE)
return false;
if (obj->hasType(types::Type::StringType()))
return false;
*arrayType = obj->getTypedArrayType();
if (*arrayType == TypedArray::TYPE_MAX)
return false;
JS_ASSERT(*arrayType >= 0 && *arrayType < TypedArray::TYPE_MAX);
// Unlike dense arrays, the types of elements in typed arrays are not
// guaranteed to be present in the object's type, and we need to use
// knowledge about the possible contents of the array vs. the types
// that have been read out of it to figure out how to do the load.
types::TypeSet *result = propertyRead(script, pc);
if (*arrayType == TypedArray::TYPE_FLOAT32 || *arrayType == TypedArray::TYPE_FLOAT64) {
if (!result->hasType(types::Type::DoubleType()))
return false;
} else {
if (!result->hasType(types::Type::Int32Type()))
return false;
}
return true;
}
TypeOracle::UnaryTypes
TypeInferenceOracle::unaryTypes(RawScript script, jsbytecode *pc)
{
JS_ASSERT(script == this->script());
UnaryTypes res;
res.inTypes = script->analysis()->poppedTypes(pc, 0);
res.outTypes = script->analysis()->pushedTypes(pc, 0);
return res;
}
bool
TypeInferenceOracle::elementReadIsDenseNative(RawScript script, jsbytecode *pc)
{
// Check whether the object is a dense array and index is int32 or double.
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 1);
StackTypeSet *id = script->analysis()->poppedTypes(pc, 0);
JSValueType idType = id->getKnownTypeTag();
if (idType != JSVAL_TYPE_INT32 && idType != JSVAL_TYPE_DOUBLE)
return false;
Class *clasp = obj->getKnownClass();
return clasp && clasp->isNative();
}
bool
TypeInferenceOracle::elementWriteIsTypedArray(RawScript script, jsbytecode *pc, int *arrayType)
{
return elementWriteIsTypedArray(script->analysis()->poppedTypes(pc, 2),
script->analysis()->poppedTypes(pc, 1),
arrayType);
}
MIRType
TypeInferenceOracle::elementWrite(RawScript script, jsbytecode *pc)
{
StackTypeSet *objTypes = script->analysis()->poppedTypes(pc, 2);
MIRType elementType = MIRType_None;
unsigned count = objTypes->getObjectCount();
for (unsigned i = 0; i < count; i++) {
if (objTypes->getSingleObject(i))
return MIRType_None;
if (TypeObject *object = objTypes->getTypeObject(i)) {
if (object->unknownProperties())
return MIRType_None;
types::HeapTypeSet *elementTypes = object->getProperty(cx, JSID_VOID, false);
if (!elementTypes)
return MIRType_None;
MIRType type = getMIRType(elementTypes);
if (type == MIRType_None)
return MIRType_None;
if (elementType == MIRType_None)
elementType = type;
else if (elementType != type)
return MIRType_None;
}
}
return elementType;
}
bool
TypeInferenceOracle::arrayResultShouldHaveDoubleConversion(RawScript script, jsbytecode *pc)
{
types::StackTypeSet::DoubleConversion conversion =
script->analysis()->pushedTypes(pc, 0)->convertDoubleElements(cx);
return conversion == types::StackTypeSet::AlwaysConvertToDoubles;
}
bool
TypeInferenceOracle::elementReadShouldAlwaysLoadDoubles(RawScript script, jsbytecode *pc)
{
StackTypeSet *types = script->analysis()->poppedTypes(pc, 1);
types::StackTypeSet::DoubleConversion conversion = types->convertDoubleElements(cx);
return conversion == StackTypeSet::AlwaysConvertToDoubles;
}
bool
TypeInferenceOracle::elementWriteNeedsBarrier(RawScript script, jsbytecode *pc)
{
// Return true if SETELEM-like instructions need a write barrier before modifying
// a property. The object is the third value popped by SETELEM.
return elementWriteNeedsBarrier(script->analysis()->poppedTypes(pc, 2));
}
bool
TypeInferenceOracle::elementWriteNeedsDoubleConversion(RawScript script, jsbytecode *pc)
{
StackTypeSet *types = script->analysis()->poppedTypes(pc, 2);
types::StackTypeSet::DoubleConversion conversion = types->convertDoubleElements(cx);
return conversion == StackTypeSet::AlwaysConvertToDoubles ||
conversion == StackTypeSet::MaybeConvertToDoubles;
}
bool
TypeInferenceOracle::elementWriteIsTypedArray(RawScript script, jsbytecode *pc, int *arrayType)
{
// Check whether the object is a dense array and index is int32 or double.
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 2);
StackTypeSet *id = script->analysis()->poppedTypes(pc, 1);
JSValueType idType = id->getKnownTypeTag();
if (idType != JSVAL_TYPE_INT32 && idType != JSVAL_TYPE_DOUBLE)
return false;
*arrayType = obj->getTypedArrayType();
if (*arrayType == TypedArray::TYPE_MAX)
return false;
return true;
}
TypeOracle::Binary
TypeInferenceOracle::binaryOp(RawScript script, jsbytecode *pc)
{
JS_ASSERT(script == this->script());
JSOp op = (JSOp)*pc;
Binary res;
if (op == JSOP_NEG || op == JSOP_POS) {
res.lhs = getMIRType(script->analysis()->poppedTypes(pc, 0));
res.rhs = MIRType_Int32;
res.rval = getMIRType(script->analysis()->pushedTypes(pc, 0));
} else {
res.lhs = getMIRType(script->analysis()->poppedTypes(pc, 1));
res.rhs = getMIRType(script->analysis()->poppedTypes(pc, 0));
res.rval = getMIRType(script->analysis()->pushedTypes(pc, 0));
}
return res;
}
TypeOracle::Unary
TypeInferenceOracle::unaryOp(RawScript script, jsbytecode *pc)
{
JS_ASSERT(script == this->script());
Unary res;
res.ival = getMIRType(script->analysis()->poppedTypes(pc, 0));
res.rval = getMIRType(script->analysis()->pushedTypes(pc, 0));
return res;
}
TypeOracle::BinaryTypes
TypeInferenceOracle::binaryTypes(RawScript script, jsbytecode *pc)
{
JS_ASSERT(script == this->script());
JSOp op = (JSOp)*pc;
BinaryTypes res;
if (op == JSOP_NEG || op == JSOP_POS) {
res.lhsTypes = script->analysis()->poppedTypes(pc, 0);
res.rhsTypes = NULL;
res.outTypes = script->analysis()->pushedTypes(pc, 0);
} else {
res.lhsTypes = script->analysis()->poppedTypes(pc, 1);
res.rhsTypes = script->analysis()->poppedTypes(pc, 0);
res.outTypes = script->analysis()->pushedTypes(pc, 0);
}
return res;
}
bool
TypeInferenceOracle::elementWriteHasExtraIndexedProperty(RawScript script, jsbytecode *pc)
{
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 2);
if (obj->hasObjectFlags(cx, types::OBJECT_FLAG_LENGTH_OVERFLOW))
return true;
return types::TypeCanHaveExtraIndexedProperties(cx, obj);
}
void
TypeInferenceOracle::elementReadGeneric(RawScript script, jsbytecode *pc, bool *cacheable, bool *monitorResult, bool *intIndex)
{
MIRType obj = getMIRType(script->analysis()->poppedTypes(pc, 1));
MIRType id = getMIRType(script->analysis()->poppedTypes(pc, 0));
*cacheable = (obj == MIRType_Object &&
(id == MIRType_Value || id == MIRType_Int32 || id == MIRType_String));
*intIndex = id == MIRType_Int32;
// Turn off cacheing if the element is int32 and we've seen non-native objects as the target
// of this getelem.
if (*cacheable && id == MIRType_Int32 && script->analysis()->getCode(pc).nonNativeGetElement)
*cacheable = false;
if (*cacheable)
*monitorResult = (id == MIRType_String || script->analysis()->getCode(pc).getStringElement);
else
*monitorResult = true;
}
bool
TypeInferenceOracle::elementReadIsString(RawScript script, jsbytecode *pc)
{
// Check for string[index].
StackTypeSet *value = script->analysis()->poppedTypes(pc, 1);
StackTypeSet *id = script->analysis()->poppedTypes(pc, 0);
if (value->getKnownTypeTag() != JSVAL_TYPE_STRING)
return false;
JSValueType idType = id->getKnownTypeTag();
if (idType != JSVAL_TYPE_INT32 && idType != JSVAL_TYPE_DOUBLE)
return false;
// This function is used for jsop_getelem_string which should return
// undefined if this is out-side the string bounds. Currently we just
// fallback to a CallGetElement.
StackTypeSet *pushed = script->analysis()->pushedTypes(pc, 0);
if (pushed->getKnownTypeTag() != JSVAL_TYPE_STRING)
return false;
return true;
}
LazyArgumentsType
TypeInferenceOracle::elementWriteMagicArguments(RawScript script, jsbytecode *pc)
{
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 2);
return isArgumentObject(obj);
}
bool
TypeInferenceOracle::propertyReadAccessGetter(RawScript script, jsbytecode *pc)
{
return script->analysis()->getCode(pc).accessGetter;
}
bool
TypeInferenceOracle::propertyWriteNeedsBarrier(RawScript script, jsbytecode *pc, RawId id)
{
StackTypeSet *types = script->analysis()->poppedTypes(pc, 1);
return types->propertyNeedsBarrier(cx, id);
}
bool
TypeInferenceOracle::propertyWriteCanSpecialize(RawScript script, jsbytecode *pc)
{
return !script->analysis()->getCode(pc).monitoredTypes;
}
bool
TypeInferenceOracle::elementReadHasExtraIndexedProperty(RawScript script, jsbytecode *pc)
{
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 1);
return types::TypeCanHaveExtraIndexedProperties(cx, obj);
}
bool
TypeInferenceOracle::setElementHasWrittenHoles(RawScript script, jsbytecode *pc)
{
return script->analysis()->getCode(pc).arrayWriteHole;
}
bool
TypeInferenceOracle::elementWriteIsPacked(RawScript script, jsbytecode *pc)
{
StackTypeSet *types = script->analysis()->poppedTypes(pc, 2);
return !types->hasObjectFlags(cx, types::OBJECT_FLAG_NON_PACKED);
}