// 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 {

transitioning javascript builtin

ArrayForEachLoopEagerDeoptContinuation(

js-implicit context: NativeContext, receiver: JSAny)(

callback: JSAny, thisArg: JSAny, initialK: JSAny, length: JSAny): JSAny {

// All continuation points in the optimized forEach implementation 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: NativeContext, receiver: JSAny)(

callback: JSAny, thisArg: JSAny, initialK: JSAny, length: JSAny,

_result: JSAny): JSAny {

// All continuation points in the optimized forEach implementation 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: NativeContext, 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[1];

// 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(MessageTemplate::kCalledNonCallable, arguments[0]);

}

}

}