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
|
// Copyright 2016 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.h"
#include "src/builtins/builtins-utils.h"
namespace v8 {
namespace internal {
// -----------------------------------------------------------------------------
// ES6 section 21.1 ArrayBuffer Objects
// ES6 section 24.1.2.1 ArrayBuffer ( length ) for the [[Call]] case.
BUILTIN(ArrayBufferConstructor) {
HandleScope scope(isolate);
Handle<JSFunction> target = args.target();
DCHECK(*target == target->native_context()->array_buffer_fun() ||
*target == target->native_context()->shared_array_buffer_fun());
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kConstructorNotFunction,
handle(target->shared()->name(), isolate)));
}
// ES6 section 24.1.2.1 ArrayBuffer ( length ) for the [[Construct]] case.
BUILTIN(ArrayBufferConstructor_ConstructStub) {
HandleScope scope(isolate);
Handle<JSFunction> target = args.target();
Handle<JSReceiver> new_target = Handle<JSReceiver>::cast(args.new_target());
Handle<Object> length = args.atOrUndefined(isolate, 1);
DCHECK(*target == target->native_context()->array_buffer_fun() ||
*target == target->native_context()->shared_array_buffer_fun());
Handle<Object> number_length;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, number_length,
Object::ToInteger(isolate, length));
if (number_length->Number() < 0.0) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewRangeError(MessageTemplate::kInvalidArrayBufferLength));
}
Handle<JSObject> result;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
JSObject::New(target, new_target));
size_t byte_length;
if (!TryNumberToSize(*number_length, &byte_length)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewRangeError(MessageTemplate::kInvalidArrayBufferLength));
}
SharedFlag shared_flag =
(*target == target->native_context()->array_buffer_fun())
? SharedFlag::kNotShared
: SharedFlag::kShared;
if (!JSArrayBuffer::SetupAllocatingData(Handle<JSArrayBuffer>::cast(result),
isolate, byte_length, true,
shared_flag)) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewRangeError(MessageTemplate::kArrayBufferAllocationFailed));
}
return *result;
}
// ES6 section 24.1.4.1 get ArrayBuffer.prototype.byteLength
BUILTIN(ArrayBufferPrototypeGetByteLength) {
HandleScope scope(isolate);
CHECK_RECEIVER(JSArrayBuffer, array_buffer,
"get ArrayBuffer.prototype.byteLength");
if (array_buffer->is_shared()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kIncompatibleMethodReceiver,
isolate->factory()->NewStringFromAsciiChecked(
"get ArrayBuffer.prototype.byteLength"),
args.receiver()));
}
// TODO(franzih): According to the ES6 spec, we should throw a TypeError
// here if the JSArrayBuffer is detached.
return array_buffer->byte_length();
}
// ES6 section 24.1.3.1 ArrayBuffer.isView ( arg )
BUILTIN(ArrayBufferIsView) {
SealHandleScope shs(isolate);
DCHECK_EQ(2, args.length());
Object* arg = args[1];
return isolate->heap()->ToBoolean(arg->IsJSArrayBufferView());
}
} // namespace internal
} // namespace v8
|
