1  /*
 2   * Copyright (C) 2019 Apple, Inc. All rights reserved.
 3   *
 4   * Redistribution and use in source and binary forms, with or without
 5   * modification, are permitted provided that the following conditions
 6   * are met:
 7   * 1. Redistributions of source code must retain the above copyright
 8   *    notice, this list of conditions and the following disclaimer.
 9   * 2. Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24   */
25  
26  #include "config.h"
27  #include "WeakObjectRefConstructor.h"
28  
29  #include "JSCInlines.h"
30  #include "JSWeakObjectRef.h"
31  #include "WeakObjectRefPrototype.h"
32  
33  namespace JSC {
34  
35  const ClassInfo WeakObjectRefConstructor::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(WeakObjectRefConstructor) };
36  
37  void WeakObjectRefConstructor::finishCreation(VM& vm, WeakObjectRefPrototype* prototype)
38  {
39      Base::finishCreation(vm, 1, "WeakRef"_s, PropertyAdditionMode::WithoutStructureTransition);
40      putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
41  }
42  
43  static JSC_DECLARE_HOST_FUNCTION(callWeakRef);
44  static JSC_DECLARE_HOST_FUNCTION(constructWeakRef);
45  
46  WeakObjectRefConstructor::WeakObjectRefConstructor(VM& vm, Structure* structure)
47      : Base(vm, structure, callWeakRef, constructWeakRef)
48  {
49  }
50  
51  JSC_DEFINE_HOST_FUNCTION(callWeakRef, (JSGlobalObject* globalObject, CallFrame*))
52  {
53      VM& vm = globalObject->vm();
54      auto scope = DECLARE_THROW_SCOPE(vm);
55      return JSValue::encode(throwConstructorCannotBeCalledAsFunctionTypeError(globalObject, scope, "WeakRef"));
56  }
57  
58  JSC_DEFINE_HOST_FUNCTION(constructWeakRef, (JSGlobalObject* globalObject, CallFrame* callFrame))
59  {
60      VM& vm = globalObject->vm();
61      auto scope = DECLARE_THROW_SCOPE(vm);
62  
63      if (!callFrame->argument(0).isObject())
64          return throwVMTypeError(globalObject, scope, "First argument to WeakRef should be an object"_s);
65  
66      JSObject* newTarget = asObject(callFrame->newTarget());
67      Structure* weakObjectRefStructure = newTarget == callFrame->jsCallee()
68          ? globalObject->weakObjectRefStructure()
69          : InternalFunction::createSubclassStructure(globalObject, newTarget, getFunctionRealm(vm, newTarget)->weakObjectRefStructure());
70      RETURN_IF_EXCEPTION(scope, { });
71  
72      RELEASE_AND_RETURN(scope, JSValue::encode(JSWeakObjectRef::create(vm, weakObjectRefStructure, callFrame->uncheckedArgument(0).getObject())));
73  }
74  
75  }
76