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// 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::IterableToList(
implicit context: Context)(JSAny, JSAny): JSArray;
extern macro IteratorBuiltinsAssembler::StringListFromIterable(
implicit context: Context)(JSAny): JSArray;
extern builtin IterableToListWithSymbolLookup(implicit context: Context)(JSAny):
JSArray;
extern builtin IterableToFixedArrayWithSymbolLookupSlow(
implicit context: Context)(JSAny): FixedArray;
transitioning builtin GetIteratorWithFeedback(
context: Context, receiver: JSAny, loadSlot: TaggedIndex,
callSlot: TaggedIndex,
maybeFeedbackVector: Undefined|FeedbackVector): JSAny {
// TODO(v8:9891): Remove this dcheck once all callers are ported to Torque.
// This dcheck ensures correctness of maybeFeedbackVector's type which can
// be easily broken for calls from CSA.
dcheck(
IsUndefined(maybeFeedbackVector) ||
Is<FeedbackVector>(maybeFeedbackVector));
let iteratorMethod: JSAny;
typeswitch (maybeFeedbackVector) {
case (Undefined): {
iteratorMethod = GetProperty(receiver, IteratorSymbolConstant());
}
case (feedback: FeedbackVector): {
iteratorMethod = LoadIC(
context, receiver, IteratorSymbolConstant(), loadSlot, feedback);
}
}
// TODO(v8:10047): Use TaggedIndex here once TurboFan supports it.
const callSlotSmi: Smi = TaggedIndexToSmi(callSlot);
return CallIteratorWithFeedback(
context, receiver, iteratorMethod, callSlotSmi, maybeFeedbackVector);
}
extern macro LoadContextFromBaseline(): Context;
extern macro LoadFeedbackVectorFromBaseline(): FeedbackVector;
transitioning builtin GetIteratorBaseline(
receiver: JSAny, loadSlot: TaggedIndex, callSlot: TaggedIndex): JSAny {
const context: Context = LoadContextFromBaseline();
const feedback: FeedbackVector = LoadFeedbackVectorFromBaseline();
const iteratorMethod: JSAny =
LoadIC(context, receiver, IteratorSymbolConstant(), loadSlot, feedback);
// TODO(v8:10047): Use TaggedIndex here once TurboFan supports it.
const callSlotSmi: Smi = TaggedIndexToSmi(callSlot);
return CallIteratorWithFeedback(
context, receiver, iteratorMethod, callSlotSmi, feedback);
}
extern macro CreateAsyncFromSyncIterator(Context, JSAny): JSAny;
transitioning builtin CreateAsyncFromSyncIteratorBaseline(syncIterator: JSAny):
JSAny {
const context: Context = LoadContextFromBaseline();
return CreateAsyncFromSyncIterator(context, syncIterator);
}
macro GetLazyReceiver(receiver: JSAny): JSAny {
return receiver;
}
transitioning builtin CallIteratorWithFeedback(
context: Context, receiver: JSAny, iteratorMethod: JSAny, callSlot: Smi,
feedback: Undefined|FeedbackVector): JSAny {
// TODO(v8:10047): Use TaggedIndex here once TurboFan supports it.
const callSlotUnTagged: uintptr = Unsigned(SmiUntag(callSlot));
ic::CollectCallFeedback(
iteratorMethod, %MakeLazy<JSAny, JSAny>('GetLazyReceiver', receiver),
context, feedback, callSlotUnTagged);
const iteratorCallable: Callable = Cast<Callable>(iteratorMethod)
otherwise ThrowIteratorError(receiver);
const iterator = Call(context, iteratorCallable, receiver);
ThrowIfNotJSReceiver(iterator, MessageTemplate::kSymbolIteratorInvalid, '');
return iterator;
}
// https://tc39.es/ecma262/#sec-iteratorclose
@export
transitioning macro IteratorCloseOnException(implicit context: Context)(
iterator: IteratorRecord): void {
try {
// 4. Let innerResult be GetMethod(iterator, "return").
const method = GetProperty(iterator.object, kReturnString);
// 5. If innerResult.[[Type]] is normal, then
// a. Let return be innerResult.[[Value]].
// b. If return is undefined, return Completion(completion).
if (method == Undefined || method == Null) return;
// c. Set innerResult to Call(return, iterator).
// If an exception occurs, the original exception remains bound
Call(context, method, iterator.object);
} catch (_e, _message) {
// Swallow the exception.
}
// (If completion.[[Type]] is throw) return Completion(completion).
}
}
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