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1// Copyright 2018 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5namespace array {
6transitioning javascript builtin
7ArrayForEachLoopEagerDeoptContinuation(
8    js-implicit context: NativeContext, receiver: JSAny)(
9    callback: JSAny, thisArg: JSAny, initialK: JSAny, length: JSAny): JSAny {
10  // All continuation points in the optimized forEach implementation are
11  // after the ToObject(O) call that ensures we are dealing with a
12  // JSReceiver.
13  const jsreceiver = Cast<JSReceiver>(receiver) otherwise unreachable;
14  const callbackfn = Cast<Callable>(callback) otherwise unreachable;
15  const numberK = Cast<Number>(initialK) otherwise unreachable;
16  const numberLength = Cast<Number>(length) otherwise unreachable;
17
18  return ArrayForEachLoopContinuation(
19      jsreceiver, callbackfn, thisArg, Undefined, jsreceiver, numberK,
20      numberLength, Undefined);
21}
22
23transitioning javascript builtin
24ArrayForEachLoopLazyDeoptContinuation(
25    js-implicit context: NativeContext, receiver: JSAny)(
26    callback: JSAny, thisArg: JSAny, initialK: JSAny, length: JSAny,
27    _result: JSAny): JSAny {
28  // All continuation points in the optimized forEach implementation are
29  // after the ToObject(O) call that ensures we are dealing with a
30  // JSReceiver.
31  const jsreceiver = Cast<JSReceiver>(receiver) otherwise unreachable;
32  const callbackfn = Cast<Callable>(callback) otherwise unreachable;
33  const numberK = Cast<Number>(initialK) otherwise unreachable;
34  const numberLength = Cast<Number>(length) otherwise unreachable;
35
36  return ArrayForEachLoopContinuation(
37      jsreceiver, callbackfn, thisArg, Undefined, jsreceiver, numberK,
38      numberLength, Undefined);
39}
40
41transitioning builtin ArrayForEachLoopContinuation(implicit context: Context)(
42    _receiver: JSReceiver, callbackfn: Callable, thisArg: JSAny, _array: JSAny,
43    o: JSReceiver, initialK: Number, len: Number, _to: JSAny): JSAny {
44  // variables {array} and {to} are ignored.
45
46  // 5. Let k be 0.
47  // 6. Repeat, while k < len
48  for (let k: Number = initialK; k < len; k = k + 1) {
49    // 6a. Let Pk be ! ToString(k).
50    // k is guaranteed to be a positive integer, hence ToString is
51    // side-effect free and HasProperty/GetProperty do the conversion inline.
52
53    // 6b. Let kPresent be ? HasProperty(O, Pk).
54    const kPresent: Boolean = HasProperty_Inline(o, k);
55
56    // 6c. If kPresent is true, then
57    if (kPresent == True) {
58      // 6c. i. Let kValue be ? Get(O, Pk).
59      const kValue: JSAny = GetProperty(o, k);
60
61      // 6c. ii. Perform ? Call(callbackfn, T, <kValue, k, O>).
62      Call(context, callbackfn, thisArg, kValue, k, o);
63    }
64
65    // 6d. Increase k by 1. (done by the loop).
66  }
67  return Undefined;
68}
69
70transitioning macro FastArrayForEach(implicit context: Context)(
71    o: JSReceiver, len: Number, callbackfn: Callable, thisArg: JSAny): JSAny
72    labels Bailout(Smi) {
73  let k: Smi = 0;
74  const smiLen = Cast<Smi>(len) otherwise goto Bailout(k);
75  const fastO = Cast<FastJSArray>(o) otherwise goto Bailout(k);
76  let fastOW = NewFastJSArrayWitness(fastO);
77
78  // Build a fast loop over the smi array.
79  for (; k < smiLen; k++) {
80    fastOW.Recheck() otherwise goto Bailout(k);
81
82    // Ensure that we haven't walked beyond a possibly updated length.
83    if (k >= fastOW.Get().length) goto Bailout(k);
84    const value: JSAny = fastOW.LoadElementNoHole(k)
85        otherwise continue;
86    Call(context, callbackfn, thisArg, value, k, fastOW.Get());
87  }
88  return Undefined;
89}
90
91// https://tc39.github.io/ecma262/#sec-array.prototype.foreach
92transitioning javascript builtin
93ArrayForEach(
94    js-implicit context: NativeContext, receiver: JSAny)(...arguments): JSAny {
95  try {
96    RequireObjectCoercible(receiver, 'Array.prototype.forEach');
97
98    // 1. Let O be ? ToObject(this value).
99    const o: JSReceiver = ToObject_Inline(context, receiver);
100
101    // 2. Let len be ? ToLength(? Get(O, "length")).
102    const len: Number = GetLengthProperty(o);
103
104    // 3. If IsCallable(callbackfn) is false, throw a TypeError exception.
105    if (arguments.length == 0) {
106      goto TypeError;
107    }
108    const callbackfn = Cast<Callable>(arguments[0]) otherwise TypeError;
109
110    // 4. If thisArg is present, let T be thisArg; else let T be undefined.
111    const thisArg: JSAny = arguments[1];
112
113    // Special cases.
114    let k: Number = 0;
115    try {
116      return FastArrayForEach(o, len, callbackfn, thisArg)
117          otherwise Bailout;
118    } label Bailout(kValue: Smi) deferred {
119      k = kValue;
120    }
121
122    return ArrayForEachLoopContinuation(
123        o, callbackfn, thisArg, Undefined, o, k, len, Undefined);
124  } label TypeError deferred {
125    ThrowTypeError(MessageTemplate::kCalledNonCallable, arguments[0]);
126  }
127}
128}
129