// 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(implicit context: Context)( receiver: Object, callback: Object, thisArg: Object, initialK: Object, length: Object): Object { // 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(implicit context: Context)( receiver: Object, callback: Object, thisArg: Object, initialK: Object, length: Object, result: Object): Object { // 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: Object, array: Object, o: JSReceiver, initialK: Number, len: Number, to: Object): Object { // 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: Object = 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: Object): Object labels Bailout(Smi) { let k: Smi = 0; const smiLen = Cast<Smi>(len) otherwise goto Bailout(k); let 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: Object = 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(context: Context, receiver: Object, ...arguments): Object { try { if (IsNullOrUndefined(receiver)) { goto NullOrUndefinedError; } // 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: Object = 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]); } label NullOrUndefinedError deferred { ThrowTypeError(kCalledOnNullOrUndefined, 'Array.prototype.forEach'); } } }