1a8b5ef80a
A function object's realm is not necessarily non-null (like when called via the Reflect API), so we can't blindly dereference it. Instead use the object's own GlobalObject.
124 lines
5 KiB
C++
124 lines
5 KiB
C++
/*
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* Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/ArrayBuffer.h>
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#include <LibJS/Runtime/ArrayBufferConstructor.h>
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#include <LibJS/Runtime/DataView.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/TypedArray.h>
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namespace JS {
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ArrayBufferConstructor::ArrayBufferConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.ArrayBuffer.as_string(), *global_object.function_prototype())
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{
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}
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void ArrayBufferConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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// 25.1.4.2 ArrayBuffer.prototype, https://tc39.es/ecma262/#sec-arraybuffer.prototype
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define_direct_property(vm.names.prototype, global_object.array_buffer_prototype(), 0);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(vm.names.isView, is_view, 1, attr);
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// 25.1.5.4 ArrayBuffer.prototype [ @@toStringTag ], https://tc39.es/ecma262/#sec-arraybuffer.prototype-@@tostringtag
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define_native_accessor(*vm.well_known_symbol_species(), symbol_species_getter, {}, Attribute::Configurable);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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}
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// 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
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ThrowCompletionOr<Value> ArrayBufferConstructor::call()
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{
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auto& vm = this->vm();
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return vm.throw_completion<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.ArrayBuffer);
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}
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// 1.1.6 GetArrayBufferMaxByteLengthOption ( options ), https://tc39.es/proposal-resizablearraybuffer/#sec-getarraybuffermaxbytelengthoption
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static ThrowCompletionOr<Optional<size_t>> get_array_buffer_max_byte_length_option(VM& vm, GlobalObject& global_object, Value options)
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{
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// 1. If Type(options) is not Object, return empty.
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if (!options.is_object())
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return Optional<size_t>();
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// 2. Let maxByteLength be ? Get(options, "maxByteLength").
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auto max_byte_length = TRY(options.get(global_object, vm.names.maxByteLength));
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// 3. If maxByteLength is undefined, return empty.
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if (max_byte_length.is_undefined())
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return Optional<size_t>();
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// 4. Return ? ToIndex(maxByteLength).
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return TRY(max_byte_length.to_index(global_object));
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}
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// 25.1.3.1 ArrayBuffer ( length ), https://tc39.es/ecma262/#sec-arraybuffer-length
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// 1.2.1 ArrayBuffer ( length [, options ] ), https://tc39.es/proposal-resizablearraybuffer/#sec-arraybuffer-constructor
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ThrowCompletionOr<Object*> ArrayBufferConstructor::construct(FunctionObject& new_target)
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{
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auto& global_object = this->global_object();
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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// NOTE: See `ArrayBufferConstructor::call()`
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// 2. Let byteLength be ? ToIndex(length).
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auto byte_length_or_error = vm.argument(0).to_index(global_object);
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if (byte_length_or_error.is_error()) {
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auto error = byte_length_or_error.release_error();
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if (error.value()->is_object() && is<RangeError>(error.value()->as_object())) {
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// Re-throw more specific RangeError
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return vm.throw_completion<RangeError>(global_object, ErrorType::InvalidLength, "array buffer");
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}
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return error;
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}
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auto byte_length = byte_length_or_error.release_value();
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// 3. Let requestedMaxByteLength be ? GetArrayBufferMaxByteLengthOption(options).
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auto options = vm.argument(1);
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auto requested_max_byte_length_value = TRY(get_array_buffer_max_byte_length_option(vm, global_object, options));
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// 4. If requestedMaxByteLength is empty, then
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if (!requested_max_byte_length_value.has_value()) {
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// a. Return ? AllocateArrayBuffer(NewTarget, byteLength).
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return TRY(allocate_array_buffer(global_object, new_target, byte_length));
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}
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auto requested_max_byte_length = requested_max_byte_length_value.release_value();
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// 5. If byteLength > requestedMaxByteLength, throw a RangeError exception.
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if (byte_length > requested_max_byte_length)
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return vm.throw_completion<RangeError>(global_object, ErrorType::ByteLengthBeyondRequestedMax);
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// 6. Return ? AllocateArrayBuffer(NewTarget, byteLength, requestedMaxByteLength).
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return TRY(allocate_array_buffer(global_object, new_target, byte_length, requested_max_byte_length));
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}
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// 25.1.4.1 ArrayBuffer.isView ( arg ), https://tc39.es/ecma262/#sec-arraybuffer.isview
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JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::is_view)
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{
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auto arg = vm.argument(0);
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if (!arg.is_object())
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return Value(false);
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if (arg.as_object().is_typed_array())
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return Value(true);
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if (is<DataView>(arg.as_object()))
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return Value(true);
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return Value(false);
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}
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// 25.1.4.3 get ArrayBuffer [ @@species ], https://tc39.es/ecma262/#sec-get-arraybuffer-@@species
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JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::symbol_species_getter)
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{
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return vm.this_value(global_object);
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}
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}
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