1 // Copyright 2016 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
5 #include "src/builtins/builtins-utils.h"
6 #include "src/builtins/builtins.h"
7 #include "src/frames-inl.h"
8
9 namespace v8 {
10 namespace internal {
11
Generate_IteratorPrototypeIterator(CodeStubAssembler * assembler)12 void Builtins::Generate_IteratorPrototypeIterator(
13 CodeStubAssembler* assembler) {
14 assembler->Return(assembler->Parameter(0));
15 }
16
BUILTIN(ModuleNamespaceIterator)17 BUILTIN(ModuleNamespaceIterator) {
18 HandleScope scope(isolate);
19 DCHECK_EQ(1, args.length());
20 Handle<Object> receiver = args.at<Object>(0);
21
22 if (!receiver->IsJSModuleNamespace()) {
23 THROW_NEW_ERROR_RETURN_FAILURE(
24 isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
25 isolate->factory()->iterator_symbol(), receiver));
26 }
27 auto ns = Handle<JSModuleNamespace>::cast(receiver);
28
29 Handle<FixedArray> names =
30 KeyAccumulator::GetKeys(ns, KeyCollectionMode::kOwnOnly, SKIP_SYMBOLS)
31 .ToHandleChecked();
32 return *isolate->factory()->NewJSFixedArrayIterator(names);
33 }
34
BUILTIN(FixedArrayIteratorNext)35 BUILTIN(FixedArrayIteratorNext) {
36 HandleScope scope(isolate);
37 DCHECK_EQ(1, args.length());
38 Handle<Object> receiver = args.at<Object>(0);
39
40 // It is an error if this function is called on anything other than the
41 // particular iterator object for which the function was created.
42 if (!receiver->IsJSFixedArrayIterator() ||
43 Handle<JSFixedArrayIterator>::cast(receiver)->initial_next() !=
44 *args.target()) {
45 THROW_NEW_ERROR_RETURN_FAILURE(
46 isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
47 isolate->factory()->next_string(), receiver));
48 }
49
50 auto iterator = Handle<JSFixedArrayIterator>::cast(receiver);
51 Handle<Object> value;
52 bool done;
53
54 int index = iterator->index();
55 if (index < iterator->array()->length()) {
56 value = handle(iterator->array()->get(index), isolate);
57 done = false;
58 iterator->set_index(index + 1);
59 } else {
60 value = isolate->factory()->undefined_value();
61 done = true;
62 }
63
64 return *isolate->factory()->NewJSIteratorResult(value, done);
65 }
66
67 } // namespace internal
68 } // namespace v8
69