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LibJS: Partially implement resizable ArrayBuffer objects

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This is (part of) a normative change in the ECMA-262 spec. See:
https://github.com/tc39/ecma262/commit/a9ae96e

This implements just support for resizing ArrayBuffer objects. This does
not implement the SharedArrayBuffer changes, as we do not have enough
support to do so.
This commit is contained in:
Timothy Flynn
2023-10-14 19:10:55 -04:00
committed by Andreas Kling
parent a1e2f131c4
commit 29ac6e3689
Notes: sideshowbarker 2024-07-17 09:37:30 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/29ac6e3689
Pull-request: https://github.com/SerenityOS/serenity/pull/22424
Reviewed-by: https://github.com/shannonbooth ✅
13 changed files with 369 additions and 14 deletions
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12
Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp
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@@ -52,8 +52,11 @@ ThrowCompletionOr<NonnullGCPtr<Object>> ArrayBufferConstructor::construct(Functi
{
auto& vm = this->vm();
auto length = vm.argument(0);
auto options = vm.argument(1);
// 2. Let byteLength be ? ToIndex(length).
auto byte_length_or_error = vm.argument(0).to_index(vm);
auto byte_length_or_error = length.to_index(vm);
if (byte_length_or_error.is_error()) {
auto error = byte_length_or_error.release_error();
@@ -64,8 +67,11 @@ ThrowCompletionOr<NonnullGCPtr<Object>> ArrayBufferConstructor::construct(Functi
return error;
}
// 3. Return ? AllocateArrayBuffer(NewTarget, byteLength).
return *TRY(allocate_array_buffer(vm, new_target, byte_length_or_error.release_value()));
// 3. Let requestedMaxByteLength be ? GetArrayBufferMaxByteLengthOption(options).
auto requested_max_byte_length = TRY(get_array_buffer_max_byte_length_option(vm, options));
// 3. Return ? AllocateArrayBuffer(NewTarget, byteLength, requestedMaxByteLength).
return *TRY(allocate_array_buffer(vm, new_target, byte_length_or_error.release_value(), requested_max_byte_length));
}
// 25.1.5.1 ArrayBuffer.isView ( arg ), https://tc39.es/ecma262/#sec-arraybuffer.isview