| /* |
| * Copyright (C) 2019 Apple, Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "WeakObjectRefPrototype.h" |
| |
| #include "Error.h" |
| #include "JSCInlines.h" |
| #include "JSWeakObjectRef.h" |
| |
| namespace JSC { |
| |
| const ClassInfo WeakObjectRefPrototype::s_info = { "WeakRef", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(WeakObjectRefPrototype) }; |
| |
| static EncodedJSValue JSC_HOST_CALL protoFuncWeakRefDeref(JSGlobalObject*, CallFrame*); |
| |
| void WeakObjectRefPrototype::finishCreation(VM& vm, JSGlobalObject* globalObject) |
| { |
| Base::finishCreation(vm); |
| ASSERT(inherits(vm, info())); |
| |
| // FIXME: It wouldn't be hard to make this an intrinsic. |
| JSC_NATIVE_FUNCTION_WITHOUT_TRANSITION(vm.propertyNames->deref, protoFuncWeakRefDeref, static_cast<unsigned>(PropertyAttribute::DontEnum), 0); |
| |
| putDirectWithoutTransition(vm, vm.propertyNames->toStringTagSymbol, jsNontrivialString(vm, "WeakRef"_s), PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly); |
| } |
| |
| ALWAYS_INLINE static JSWeakObjectRef* getWeakRef(JSGlobalObject* globalObject, JSValue value) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| if (UNLIKELY(!value.isObject())) { |
| throwTypeError(globalObject, scope, "Called WeakRef function on non-object"_s); |
| return nullptr; |
| } |
| |
| auto* ref = jsDynamicCast<JSWeakObjectRef*>(vm, asObject(value)); |
| if (LIKELY(ref)) |
| return ref; |
| |
| throwTypeError(globalObject, scope, "Called WeakRef function on a non-WeakRef object"_s); |
| return nullptr; |
| } |
| |
| EncodedJSValue JSC_HOST_CALL protoFuncWeakRefDeref(JSGlobalObject* globalObject, CallFrame* callFrame) |
| { |
| VM& vm = globalObject->vm(); |
| auto* ref = getWeakRef(globalObject, callFrame->thisValue()); |
| if (!ref) |
| return JSValue::encode(jsUndefined()); |
| |
| auto* value = ref->deref(vm); |
| return value ? JSValue::encode(value) : JSValue::encode(jsNull()); |
| } |
| |
| } |