bool
TypeInferenceOracle::propertyReadIdempotent(HandleScript script, jsbytecode *pc, HandleId id)
{
if (script->analysis()->getCode(pc).notIdempotent)
return false;
if (id != MakeTypeId(cx, id))
return false;
StackTypeSet *types = script->analysis()->poppedTypes(pc, 0);
if (!types || types->unknownObject())
return false;
for (unsigned i = 0; i < types->getObjectCount(); i++) {
if (types->getSingleObject(i))
return false;
if (TypeObject *obj = types->getTypeObject(i)) {
if (obj->unknownProperties())
return false;
// Check if the property has been reconfigured or is a getter.
HeapTypeSet *propertyTypes = obj->getProperty(cx, id, false);
if (!propertyTypes || propertyTypes->isOwnProperty(cx, obj, true))
return false;
}
}
return true;
}
bool
TypeInferenceOracle::canInlineCall(HandleScript caller, jsbytecode *pc)
{
JS_ASSERT(types::IsInlinableCall(pc));
Bytecode *code = caller->analysis()->maybeCode(pc);
if (code->monitoredTypes || code->monitoredTypesReturn || caller->analysis()->typeBarriers(cx, pc))
return false;
return true;
}
bool
TypeInferenceOracle::elementReadIsTypedArray(HandleScript 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 = DropUnrooted(script)->analysis()->poppedTypes(pc, 0);
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;
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;
}
bool
TypeInferenceOracle::elementWriteIsDenseArray(HandleScript script, jsbytecode *pc)
{
// 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 objType = obj->getKnownTypeTag();
if (objType != JSVAL_TYPE_OBJECT)
return false;
JSValueType idType = id->getKnownTypeTag();
if (idType != JSVAL_TYPE_INT32 && idType != JSVAL_TYPE_DOUBLE)
return false;
return !obj->hasObjectFlags(cx, types::OBJECT_FLAG_NON_DENSE_ARRAY);
}
bool
TypeInferenceOracle::inObjectIsDenseNativeWithoutExtraIndexedProperties(HandleScript script, jsbytecode *pc)
{
// Check whether the object is a native and index is int32 or double.
StackTypeSet *id = script->analysis()->poppedTypes(pc, 1);
StackTypeSet *obj = script->analysis()->poppedTypes(pc, 0);
JSValueType idType = id->getKnownTypeTag();
if (idType != JSVAL_TYPE_INT32 && idType != JSVAL_TYPE_DOUBLE)
return false;
Class *clasp = obj->getKnownClass();
if (!clasp || !clasp->isNative())
return false;
return !types::TypeCanHaveExtraIndexedProperties(cx, obj);
}
bool
TypeInferenceOracle::elementWriteIsDenseNative(HandleScript script, jsbytecode *pc)
{
// 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;
Class *clasp = obj->getKnownClass();
if (!clasp || !clasp->isNative())
return false;
return obj->convertDoubleElements(cx) != StackTypeSet::AmbiguousDoubleConversion;
}
bool
TypeInferenceOracle::canInlineCall(HandleScript caller, jsbytecode *pc)
{
JS_ASSERT(types::IsInlinableCall(pc));
JSOp op = JSOp(*pc);
Bytecode *code = caller->analysis()->maybeCode(pc);
// For foo.apply(this, arguments), the caller is foo and not the js_fun_apply function.
// Ignore code->monitoredTypes, as we know the caller is foo
if (op != JSOP_FUNAPPLY && code->monitoredTypes)
return false;
// Gets removed in Bug 796114
if (caller->analysis()->typeBarriers(cx, pc))
return false;
return true;
}
bool
TypeInferenceOracle::elementWriteIsDenseNative(HandleScript script, jsbytecode *pc)
{
return elementWriteIsDenseNative(script->analysis()->poppedTypes(pc, 2),
script->analysis()->poppedTypes(pc, 1));
}
