// Copyright 2018 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include 'src/builtins/builtins-iterator-gen.h' namespace iterator { // Returned from IteratorBuiltinsAssembler::GetIterator(). @export struct IteratorRecord { // iteratorRecord.[[Iterator]] object: JSReceiver; // iteratorRecord.[[NextMethod]] next: JSAny; } extern macro IteratorBuiltinsAssembler::FastIterableToList( implicit context: Context)(JSAny): JSArray labels Slow; extern macro IteratorBuiltinsAssembler::GetIteratorMethod( implicit context: Context)(JSAny): JSAny; extern macro IteratorBuiltinsAssembler::GetIterator( implicit context: Context)(JSAny): IteratorRecord; extern macro IteratorBuiltinsAssembler::GetIterator( implicit context: Context)(JSAny, JSAny): IteratorRecord; extern macro IteratorBuiltinsAssembler::IteratorStep( implicit context: Context)(IteratorRecord): JSReceiver labels Done; extern macro IteratorBuiltinsAssembler::IteratorStep( implicit context: Context)(IteratorRecord, Map): JSReceiver labels Done; extern macro IteratorBuiltinsAssembler::IteratorValue( implicit context: Context)(JSReceiver): JSAny; extern macro IteratorBuiltinsAssembler::IteratorValue( implicit context: Context)(JSReceiver, Map): JSAny; extern macro IteratorBuiltinsAssembler::IteratorCloseOnException( implicit context: Context)(IteratorRecord, JSAny): never; extern macro IteratorBuiltinsAssembler::IterableToList( implicit context: Context)(JSAny, JSAny): JSArray; extern macro IteratorBuiltinsAssembler::StringListFromIterable( implicit context: Context)(JSAny): JSArray; extern builtin IterableToListMayPreserveHoles(implicit context: Context)(JSAny, JSAny); extern builtin IterableToListWithSymbolLookup(implicit context: Context)(JSAny); transitioning builtin GetIteratorWithFeedback( context: Context, receiver: JSAny, loadSlot: Smi, callSlot: Smi, feedback: Undefined|FeedbackVector): JSAny { let iteratorMethod: JSAny; typeswitch (feedback) { case (Undefined): { iteratorMethod = GetProperty(receiver, IteratorSymbolConstant()); } case (feedback: FeedbackVector): { iteratorMethod = LoadIC( context, receiver, IteratorSymbolConstant(), loadSlot, feedback); } } return CallIteratorWithFeedback( context, receiver, iteratorMethod, callSlot, feedback); } transitioning builtin CallIteratorWithFeedback( context: Context, receiver: JSAny, iteratorMethod: JSAny, callSlot: Smi, feedback: Undefined|FeedbackVector): JSAny { const callSlotUnTagged: uintptr = Unsigned(SmiUntag(callSlot)); CollectCallFeedback(iteratorMethod, context, feedback, callSlotUnTagged); const iteratorCallable: Callable = Cast<Callable>(iteratorMethod) otherwise ThrowCalledNonCallable(iteratorMethod); return Call(context, iteratorCallable, receiver); } transitioning macro IteratorCloseOnException(implicit context: Context)( iterator: IteratorRecord, exception: Object): never labels IfException(Object) { // Let return be ? GetMethod(iterator, "return"). let method: JSAny; try { method = GetProperty(iterator.object, kReturnString); } catch (e) { goto IfException(e); } // If return is undefined, return Completion(completion). if (method == Undefined || method == Null) goto IfException(exception); // Let innerResult be Call(return, iterator, « »). // If an exception occurs, the original exception remains bound try { Call(context, method, iterator.object); } catch (_e) { goto IfException(exception); } // (If completion.[[Type]] is throw) return Completion(completion). goto IfException(exception); } }