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// Copyright 2019 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-typed-array-gen.h'
namespace typed_array_reduceright {
const kBuiltinName: constexpr string = '%TypedArray%.prototype.reduceRight';
transitioning macro ReduceRightAllElements(implicit context: Context)(
array: typed_array::AttachedJSTypedArray, callbackfn: Callable,
initialValue: Object): Object {
let witness = typed_array::NewAttachedJSTypedArrayWitness(array);
// TODO(v8:4153): Support huge TypedArrays here.
const length =
Cast<Smi>(Convert<Number>(witness.Get().length)) otherwise unreachable;
let accumulator = initialValue;
for (let k: Smi = length - 1; k >= 0; k--) {
// BUG(4895): We should throw on detached buffers rather than simply exit.
witness.Recheck() otherwise break;
const value: Object = witness.Load(k);
if (accumulator == TheHole) {
accumulator = value;
} else {
accumulator = Call(
context, callbackfn, Undefined, accumulator, value, k,
witness.GetStable());
}
}
if (accumulator == TheHole) {
ThrowTypeError(kReduceNoInitial, kBuiltinName);
}
return accumulator;
}
// https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.reduceright
transitioning javascript builtin
TypedArrayPrototypeReduceRight(
js-implicit context: Context, receiver: Object)(...arguments): Object {
// arguments[0] = callback
// arguments[1] = initialValue.
try {
const array: JSTypedArray = Cast<JSTypedArray>(receiver)
otherwise NotTypedArray;
const uarray = typed_array::EnsureAttached(array) otherwise IsDetached;
const callbackfn = Cast<Callable>(arguments[0]) otherwise NotCallable;
const initialValue = arguments.length >= 2 ? arguments[1] : TheHole;
return ReduceRightAllElements(uarray, callbackfn, initialValue);
}
label NotCallable deferred {
ThrowTypeError(kCalledNonCallable, arguments[0]);
}
label NotTypedArray deferred {
ThrowTypeError(kNotTypedArray, kBuiltinName);
}
label IsDetached deferred {
ThrowTypeError(kDetachedOperation, kBuiltinName);
}
}
}
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