1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
// 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.
#include 'src/builtins/builtins-iterator-gen.h'
namespace iterator {
// Returned from IteratorBuiltinsAssembler::GetIterator().
@export
struct IteratorRecord {
// iteratorRecord.[[Iterator]]
object: JSReceiver;
// iteratorRecord.[[NextMethod]]
next: JSAny;
}
extern macro IteratorBuiltinsAssembler::FastIterableToList(
implicit context: Context)(JSAny): JSArray labels Slow;
extern macro IteratorBuiltinsAssembler::GetIteratorMethod(
implicit context: Context)(JSAny): JSAny;
extern macro IteratorBuiltinsAssembler::GetIterator(
implicit context: Context)(JSAny): IteratorRecord;
extern macro IteratorBuiltinsAssembler::GetIterator(
implicit context: Context)(JSAny, JSAny): IteratorRecord;
extern macro IteratorBuiltinsAssembler::IteratorStep(
implicit context: Context)(IteratorRecord): JSReceiver
labels Done;
extern macro IteratorBuiltinsAssembler::IteratorStep(
implicit context: Context)(IteratorRecord, Map): JSReceiver
labels Done;
extern macro IteratorBuiltinsAssembler::IteratorValue(
implicit context: Context)(JSReceiver): JSAny;
extern macro IteratorBuiltinsAssembler::IteratorValue(
implicit context: Context)(JSReceiver, Map): JSAny;
extern macro IteratorBuiltinsAssembler::IteratorCloseOnException(
implicit context: Context)(IteratorRecord, JSAny): never;
extern macro IteratorBuiltinsAssembler::IterableToList(
implicit context: Context)(JSAny, JSAny): JSArray;
extern macro IteratorBuiltinsAssembler::StringListFromIterable(
implicit context: Context)(JSAny): JSArray;
extern builtin IterableToListMayPreserveHoles(implicit context:
Context)(JSAny, JSAny);
extern builtin IterableToListWithSymbolLookup(implicit context:
Context)(JSAny);
transitioning builtin GetIteratorWithFeedback(
context: Context, receiver: JSAny, loadSlot: TaggedIndex,
callSlot: TaggedIndex, feedback: Undefined|FeedbackVector): JSAny {
let iteratorMethod: JSAny;
typeswitch (feedback) {
case (Undefined): {
iteratorMethod = GetProperty(receiver, IteratorSymbolConstant());
}
case (feedback: FeedbackVector): {
iteratorMethod = LoadIC(
context, receiver, IteratorSymbolConstant(), loadSlot, feedback);
}
}
// TODO(v8:10047): Use TaggedIndex here once TurboFan supports it.
const callSlotSmi: Smi = TaggedIndexToSmi(callSlot);
return CallIteratorWithFeedback(
context, receiver, iteratorMethod, callSlotSmi, feedback);
}
transitioning builtin CallIteratorWithFeedback(
context: Context, receiver: JSAny, iteratorMethod: JSAny, callSlot: Smi,
feedback: Undefined|FeedbackVector): JSAny {
const callSlotUnTagged: uintptr = Unsigned(SmiUntag(callSlot));
CollectCallFeedback(iteratorMethod, context, feedback, callSlotUnTagged);
const iteratorCallable: Callable = Cast<Callable>(iteratorMethod)
otherwise ThrowCalledNonCallable(iteratorMethod);
return Call(context, iteratorCallable, receiver);
}
transitioning
macro IteratorCloseOnException(implicit context: Context)(
iterator: IteratorRecord, exception: Object): never labels
IfException(Object) {
// Let return be ? GetMethod(iterator, "return").
let method: JSAny;
try {
method = GetProperty(iterator.object, kReturnString);
} catch (e) {
goto IfException(e);
}
// If return is undefined, return Completion(completion).
if (method == Undefined || method == Null) goto IfException(exception);
// Let innerResult be Call(return, iterator, « »).
// If an exception occurs, the original exception remains bound
try {
Call(context, method, iterator.object);
} catch (_e) {
goto IfException(exception);
}
// (If completion.[[Type]] is throw) return Completion(completion).
goto IfException(exception);
}
}
|
