blob: d1f0e4250e82962018e63bd435ec8260321590e7 (
plain)
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
|
// Copyright 2022 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/accessors.h"
#include "src/builtins/builtins-utils-inl.h"
#include "src/objects/js-shared-array-inl.h"
namespace v8 {
namespace internal {
// We cannot allocate large objects with |AllocationType::kSharedOld|,
// see |HeapAllocator::AllocateRawLargeInternal|.
constexpr int kMaxJSSharedArraySize = (1 << 14) - 2;
static_assert(FixedArray::SizeFor(kMaxJSSharedArraySize) <=
kMaxRegularHeapObjectSize);
BUILTIN(SharedArrayConstructor) {
DCHECK(FLAG_shared_string_table);
HandleScope scope(isolate);
auto* factory = isolate->factory();
Handle<Object> length_arg = args.atOrUndefined(isolate, 1);
Handle<Object> length_number;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, length_number,
Object::ToInteger(isolate, length_arg));
if (!length_number->IsSmi()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewRangeError(MessageTemplate::kSharedArraySizeOutOfRange));
}
int length = Handle<Smi>::cast(length_number)->value();
if (length < 0 || length > kMaxJSSharedArraySize) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewRangeError(MessageTemplate::kSharedArraySizeOutOfRange));
}
Handle<FixedArrayBase> storage =
factory->NewFixedArray(length, AllocationType::kSharedOld);
Handle<JSSharedArray> instance = Handle<JSSharedArray>::cast(
factory->NewJSObject(args.target(), AllocationType::kSharedOld));
instance->set_elements(*storage);
return *instance;
}
} // namespace internal
} // namespace v8
|
