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1 // Copyright 2017 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 #ifndef V8_OBJECTS_JS_ARRAY_INL_H_
6 #define V8_OBJECTS_JS_ARRAY_INL_H_
7 
8 #include "src/objects/js-array.h"
9 
10 #include "src/objects/objects-inl.h"  // Needed for write barriers
11 
12 // Has to be the last include (doesn't have include guards):
13 #include "src/objects/object-macros.h"
14 
15 namespace v8 {
16 namespace internal {
17 
OBJECT_CONSTRUCTORS_IMPL(JSArray,JSObject)18 OBJECT_CONSTRUCTORS_IMPL(JSArray, JSObject)
19 OBJECT_CONSTRUCTORS_IMPL(JSArrayIterator, JSObject)
20 
21 CAST_ACCESSOR(JSArray)
22 CAST_ACCESSOR(JSArrayIterator)
23 
24 ACCESSORS(JSArray, length, Object, kLengthOffset)
25 
26 void JSArray::set_length(Smi length) {
27   // Don't need a write barrier for a Smi.
28   set_length(Object(length.ptr()), SKIP_WRITE_BARRIER);
29 }
30 
SetLengthWouldNormalize(Heap * heap,uint32_t new_length)31 bool JSArray::SetLengthWouldNormalize(Heap* heap, uint32_t new_length) {
32   return new_length > kMaxFastArrayLength;
33 }
34 
AllowsSetLength()35 bool JSArray::AllowsSetLength() {
36   bool result = elements().IsFixedArray() || elements().IsFixedDoubleArray();
37   DCHECK(result == !HasTypedArrayElements());
38   return result;
39 }
40 
SetContent(Handle<JSArray> array,Handle<FixedArrayBase> storage)41 void JSArray::SetContent(Handle<JSArray> array,
42                          Handle<FixedArrayBase> storage) {
43   EnsureCanContainElements(array, storage, storage->length(),
44                            ALLOW_COPIED_DOUBLE_ELEMENTS);
45 
46   DCHECK(
47       (storage->map() == array->GetReadOnlyRoots().fixed_double_array_map() &&
48        IsDoubleElementsKind(array->GetElementsKind())) ||
49       ((storage->map() != array->GetReadOnlyRoots().fixed_double_array_map()) &&
50        (IsObjectElementsKind(array->GetElementsKind()) ||
51         (IsSmiElementsKind(array->GetElementsKind()) &&
52          Handle<FixedArray>::cast(storage)->ContainsOnlySmisOrHoles()))));
53   array->set_elements(*storage);
54   array->set_length(Smi::FromInt(storage->length()));
55 }
56 
HasArrayPrototype(Isolate * isolate)57 bool JSArray::HasArrayPrototype(Isolate* isolate) {
58   return map().prototype() == *isolate->initial_array_prototype();
59 }
60 
ACCESSORS(JSArrayIterator,iterated_object,Object,kIteratedObjectOffset)61 ACCESSORS(JSArrayIterator, iterated_object, Object, kIteratedObjectOffset)
62 ACCESSORS(JSArrayIterator, next_index, Object, kNextIndexOffset)
63 
64 SMI_ACCESSORS(JSArrayIterator, raw_kind, kKindOffset)
65 
66 IterationKind JSArrayIterator::kind() const {
67   return static_cast<IterationKind>(raw_kind());
68 }
69 
set_kind(IterationKind kind)70 void JSArrayIterator::set_kind(IterationKind kind) {
71   set_raw_kind(static_cast<int>(kind));
72 }
73 
74 }  // namespace internal
75 }  // namespace v8
76 
77 #include "src/objects/object-macros-undef.h"
78 
79 #endif  // V8_OBJECTS_JS_ARRAY_INL_H_
80