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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.
namespace array_foreach {
transitioning javascript builtin
ArrayForEachLoopEagerDeoptContinuation(
js-implicit context: Context, receiver: JSAny)(
callback: JSAny, thisArg: JSAny, initialK: JSAny, length: JSAny): JSAny {
// All continuation points in the optimized forEach implemntation are
// after the ToObject(O) call that ensures we are dealing with a
// JSReceiver.
const jsreceiver = Cast<JSReceiver>(receiver) otherwise unreachable;
const callbackfn = Cast<Callable>(callback) otherwise unreachable;
const numberK = Cast<Number>(initialK) otherwise unreachable;
const numberLength = Cast<Number>(length) otherwise unreachable;
return ArrayForEachLoopContinuation(
jsreceiver, callbackfn, thisArg, Undefined, jsreceiver, numberK,
numberLength, Undefined);
}
transitioning javascript builtin
ArrayForEachLoopLazyDeoptContinuation(
js-implicit context: Context, receiver: JSAny)(
callback: JSAny, thisArg: JSAny, initialK: JSAny, length: JSAny,
_result: JSAny): JSAny {
// All continuation points in the optimized forEach implemntation are
// after the ToObject(O) call that ensures we are dealing with a
// JSReceiver.
const jsreceiver = Cast<JSReceiver>(receiver) otherwise unreachable;
const callbackfn = Cast<Callable>(callback) otherwise unreachable;
const numberK = Cast<Number>(initialK) otherwise unreachable;
const numberLength = Cast<Number>(length) otherwise unreachable;
return ArrayForEachLoopContinuation(
jsreceiver, callbackfn, thisArg, Undefined, jsreceiver, numberK,
numberLength, Undefined);
}
transitioning builtin ArrayForEachLoopContinuation(implicit context: Context)(
_receiver: JSReceiver, callbackfn: Callable, thisArg: JSAny,
_array: JSAny, o: JSReceiver, initialK: Number, len: Number,
_to: JSAny): JSAny {
// variables {array} and {to} are ignored.
// 5. Let k be 0.
// 6. Repeat, while k < len
for (let k: Number = initialK; k < len; k = k + 1) {
// 6a. Let Pk be ! ToString(k).
// k is guaranteed to be a positive integer, hence ToString is
// side-effect free and HasProperty/GetProperty do the conversion inline.
// 6b. Let kPresent be ? HasProperty(O, Pk).
const kPresent: Boolean = HasProperty_Inline(o, k);
// 6c. If kPresent is true, then
if (kPresent == True) {
// 6c. i. Let kValue be ? Get(O, Pk).
const kValue: JSAny = GetProperty(o, k);
// 6c. ii. Perform ? Call(callbackfn, T, <kValue, k, O>).
Call(context, callbackfn, thisArg, kValue, k, o);
}
// 6d. Increase k by 1. (done by the loop).
}
return Undefined;
}
transitioning macro FastArrayForEach(implicit context: Context)(
o: JSReceiver, len: Number, callbackfn: Callable, thisArg: JSAny): JSAny
labels Bailout(Smi) {
let k: Smi = 0;
const smiLen = Cast<Smi>(len) otherwise goto Bailout(k);
const fastO = Cast<FastJSArray>(o) otherwise goto Bailout(k);
let fastOW = NewFastJSArrayWitness(fastO);
// Build a fast loop over the smi array.
for (; k < smiLen; k++) {
fastOW.Recheck() otherwise goto Bailout(k);
// Ensure that we haven't walked beyond a possibly updated length.
if (k >= fastOW.Get().length) goto Bailout(k);
const value: JSAny = fastOW.LoadElementNoHole(k)
otherwise continue;
Call(context, callbackfn, thisArg, value, k, fastOW.Get());
}
return Undefined;
}
// https://tc39.github.io/ecma262/#sec-array.prototype.foreach
transitioning javascript builtin
ArrayForEach(js-implicit context: Context, receiver: JSAny)(...arguments):
JSAny {
try {
RequireObjectCoercible(receiver, 'Array.prototype.forEach');
// 1. Let O be ? ToObject(this value).
const o: JSReceiver = ToObject_Inline(context, receiver);
// 2. Let len be ? ToLength(? Get(O, "length")).
const len: Number = GetLengthProperty(o);
// 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
if (arguments.length == 0) {
goto TypeError;
}
const callbackfn = Cast<Callable>(arguments[0]) otherwise TypeError;
// 4. If thisArg is present, let T be thisArg; else let T be undefined.
const thisArg: JSAny = arguments.length > 1 ? arguments[1] : Undefined;
// Special cases.
let k: Number = 0;
try {
return FastArrayForEach(o, len, callbackfn, thisArg)
otherwise Bailout;
}
label Bailout(kValue: Smi) deferred {
k = kValue;
}
return ArrayForEachLoopContinuation(
o, callbackfn, thisArg, Undefined, o, k, len, Undefined);
}
label TypeError deferred {
ThrowTypeError(kCalledNonCallable, arguments[0]);
}
}
}
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