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LibJS: Stub out Atomics.notify
We don't have the facilities to implement this method fully (namely, a fully realized SharedArrayBuffer). But we can implement enough to validate the values passed in by the user.
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@ -213,6 +213,7 @@ void AtomicsObject::initialize(Realm& realm)
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define_native_function(realm, vm.names.sub, sub, 3, attr);
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define_native_function(realm, vm.names.wait, wait, 4, attr);
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define_native_function(realm, vm.names.waitAsync, wait_async, 4, attr);
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define_native_function(realm, vm.names.notify, notify, 3, attr);
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define_native_function(realm, vm.names.xor_, xor_, 3, attr);
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// 25.4.15 Atomics [ @@toStringTag ], https://tc39.es/ecma262/#sec-atomics-@@tostringtag
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@ -486,6 +487,51 @@ JS_DEFINE_NATIVE_FUNCTION(AtomicsObject::wait_async)
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return TRY(do_wait(vm, WaitMode::Async, *typed_array, index, value, timeout));
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}
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// 25.4.15 Atomics.notify ( typedArray, index, count ), https://tc39.es/ecma262/#sec-atomics.notify
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JS_DEFINE_NATIVE_FUNCTION(AtomicsObject::notify)
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{
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auto* typed_array = TRY(typed_array_from(vm, vm.argument(0)));
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auto index = vm.argument(1);
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auto count_value = vm.argument(2);
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// 1. Let byteIndexInBuffer be ? ValidateAtomicAccessOnIntegerTypedArray(typedArray, index, true).
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// FIXME: ValidateAtomicAccessOnIntegerTypedArray is a new AO from the resizable array buffer proposal. Use it when the proposal is implemented.
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TRY(validate_integer_typed_array(vm, *typed_array, true));
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auto byte_index_in_buffer = TRY(validate_atomic_access(vm, *typed_array, index));
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// 2. If count is undefined, then
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double count = 0.0;
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if (count_value.is_undefined()) {
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// a. Let c be +∞.
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count = js_infinity().as_double();
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}
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// 3. Else,
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else {
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// a. Let intCount be ? ToIntegerOrInfinity(count).
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auto int_count = TRY(count_value.to_integer_or_infinity(vm));
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// b. Let c be max(intCount, 0).
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count = max(int_count, 0.0);
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}
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// 4. Let buffer be typedArray.[[ViewedArrayBuffer]].
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auto* buffer = typed_array->viewed_array_buffer();
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// 5. Let block be buffer.[[ArrayBufferData]].
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auto& block = buffer->buffer();
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// 6. If IsSharedArrayBuffer(buffer) is false, return +0𝔽.
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if (!buffer->is_shared_array_buffer())
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return Value { 0 };
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// FIXME: Implement the remaining steps when we support SharedArrayBuffer.
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(void)byte_index_in_buffer;
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(void)count;
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(void)block;
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return vm.throw_completion<InternalError>(ErrorType::NotImplemented, "SharedArrayBuffer"sv);
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}
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// 25.4.14 Atomics.xor ( typedArray, index, value ), https://tc39.es/ecma262/#sec-atomics.xor
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JS_DEFINE_NATIVE_FUNCTION(AtomicsObject::xor_)
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{
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