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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/ArrayBufferConstructor.h>
#include <LibJS/Runtime/DataView.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/TypedArray.h>
namespace JS {
ArrayBufferConstructor::ArrayBufferConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.ArrayBuffer.as_string(), *global_object.function_prototype())
{
}
void ArrayBufferConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 25.1.4.2 ArrayBuffer.prototype, https://tc39.es/ecma262/#sec-arraybuffer.prototype
define_direct_property(vm.names.prototype, global_object.array_buffer_prototype(), 0);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.isView, is_view, 1, attr);
// 25.1.5.4 ArrayBuffer.prototype [ @@toStringTag ], https://tc39.es/ecma262/#sec-arraybuffer.prototype-@@tostringtag
define_native_accessor(*vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
}
ArrayBufferConstructor::~ArrayBufferConstructor()
{
}
// 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
ThrowCompletionOr<Value> ArrayBufferConstructor::call()
{
auto& vm = this->vm();
return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.ArrayBuffer);
}
// 1.1.6 GetArrayBufferMaxByteLengthOption ( options ), https://tc39.es/proposal-resizablearraybuffer/#sec-getarraybuffermaxbytelengthoption
static ThrowCompletionOr<Optional<size_t>> get_array_buffer_max_byte_length_option(VM& vm, GlobalObject& global_object, Value options)
{
// 1. If Type(options) is not Object, return empty.
if (!options.is_object())
return Optional<size_t>();
// 2. Let maxByteLength be ? Get(options, "maxByteLength").
auto max_byte_length = TRY(options.get(global_object, vm.names.maxByteLength));
// 3. If maxByteLength is undefined, return empty.
if (max_byte_length.is_undefined())
return Optional<size_t>();
// 4. Return ? ToIndex(maxByteLength).
return TRY(max_byte_length.to_index(global_object));
}
// 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
// 1.2.1 ArrayBuffer ( length [, options ] ), https://tc39.es/proposal-resizablearraybuffer/#sec-arraybuffer-constructor
ThrowCompletionOr<Object*> ArrayBufferConstructor::construct(FunctionObject& new_target)
{
auto& global_object = new_target.realm()->global_object();
auto& vm = this->vm();
// 1. If NewTarget is undefined, throw a TypeError exception.
// NOTE: See `ArrayBufferConstructor::call()`
// 2. Let byteLength be ? ToIndex(length).
auto byte_length_or_error = vm.argument(0).to_index(global_object);
if (byte_length_or_error.is_error()) {
auto error = byte_length_or_error.release_error();
if (error.value()->is_object() && is<RangeError>(error.value()->as_object())) {
// Re-throw more specific RangeError
return vm.throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "array buffer");
}
return error;
}
auto byte_length = byte_length_or_error.release_value();
// 3. Let requestedMaxByteLength be ? GetArrayBufferMaxByteLengthOption(options).
auto options = vm.argument(1);
auto requested_max_byte_length_value = TRY(get_array_buffer_max_byte_length_option(vm, global_object, options));
// 4. If requestedMaxByteLength is empty, then
if (!requested_max_byte_length_value.has_value()) {
// a. Return ? AllocateArrayBuffer(NewTarget, byteLength).
return TRY(allocate_array_buffer(global_object, new_target, byte_length));
}
auto requested_max_byte_length = requested_max_byte_length_value.release_value();
// 5. If byteLength > requestedMaxByteLength, throw a RangeError exception.
if (byte_length > requested_max_byte_length)
return vm.throw_completion<RangeError>(global_object, ErrorType::ByteLengthBeyondRequestedMax);
// 6. Return ? AllocateArrayBuffer(NewTarget, byteLength, requestedMaxByteLength).
return TRY(allocate_array_buffer(global_object, new_target, byte_length, requested_max_byte_length));
}
// 25.1.4.1 ArrayBuffer.isView ( arg ), https://tc39.es/ecma262/#sec-arraybuffer.isview
JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::is_view)
{
auto arg = vm.argument(0);
if (!arg.is_object())
return Value(false);
if (arg.as_object().is_typed_array())
return Value(true);
if (is<DataView>(arg.as_object()))
return Value(true);
return Value(false);
}
// 25.1.4.3 get ArrayBuffer [ @@species ], https://tc39.es/ecma262/#sec-get-arraybuffer-@@species
JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::symbol_species_getter)
{
return vm.this_value(global_object);
}
}
|
