1  /*
 2   *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
 3   *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
 4   *  Copyright (C) 2004-2017 Apple Inc. All rights reserved.
 5   *
 6   *  This library is free software; you can redistribute it and/or
 7   *  modify it under the terms of the GNU Library General Public
 8   *  License as published by the Free Software Foundation; either
 9   *  version 2 of the License, or (at your option) any later version.
10   *
11   *  This library is distributed in the hope that it will be useful,
12   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   *  Library General Public License for more details.
15   *
16   *  You should have received a copy of the GNU Library General Public License
17   *  along with this library; see the file COPYING.LIB.  If not, write to
18   *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19   *  Boston, MA 02110-1301, USA.
20   *
21   */
22  
23  #include "config.h"
24  #include "GetterSetter.h"
25  
26  #include "Exception.h"
27  #include "JSObjectInlines.h"
28  #include <wtf/Assertions.h>
29  
30  namespace JSC {
31  
32  STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(GetterSetter);
33  
34  const ClassInfo GetterSetter::s_info = { "GetterSetter", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(GetterSetter) };
35  
36  void GetterSetter::visitChildren(JSCell* cell, SlotVisitor& visitor)
37  {
38      GetterSetter* thisObject = jsCast<GetterSetter*>(cell);
39      ASSERT_GC_OBJECT_INHERITS(thisObject, info());
40      Base::visitChildren(thisObject, visitor);
41  
42      visitor.append(thisObject->m_getter);
43      visitor.append(thisObject->m_setter);
44  }
45  
46  JSValue callGetter(JSGlobalObject* globalObject, JSValue base, JSValue getterSetter)
47  {
48      VM& vm = globalObject->vm();
49      auto scope = DECLARE_THROW_SCOPE(vm);
50      // FIXME: Some callers may invoke get() without checking for an exception first.
51      // We work around that by checking here.
52      RETURN_IF_EXCEPTION(scope, scope.exception()->value());
53  
54      JSObject* getter = jsCast<GetterSetter*>(getterSetter)->getter();
55  
56      auto callData = getCallData(vm, getter);
57      RELEASE_AND_RETURN(scope, call(globalObject, getter, callData, base, ArgList()));
58  }
59  
60  bool callSetter(JSGlobalObject* globalObject, JSValue base, JSValue getterSetter, JSValue value, ECMAMode ecmaMode)
61  {
62      VM& vm = globalObject->vm();
63      auto scope = DECLARE_THROW_SCOPE(vm);
64  
65      GetterSetter* getterSetterObj = jsCast<GetterSetter*>(getterSetter);
66  
67      if (getterSetterObj->isSetterNull())
68          return typeError(globalObject, scope, ecmaMode.isStrict(), ReadonlyPropertyWriteError);
69  
70      JSObject* setter = getterSetterObj->setter();
71  
72      MarkedArgumentBuffer args;
73      args.append(value);
74      ASSERT(!args.hasOverflowed());
75  
76      auto callData = getCallData(vm, setter);
77      scope.release();
78      call(globalObject, setter, callData, base, args);
79      return true;
80  }
81  
82  } // namespace JSC