runtime/GetterSetter.cpp

   1 /*
   2  *  Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
   4  *  Copyright (C) 2004, 2007, 2008, 2009 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 "Error.h"
  27 #include "JSObject.h"
  28 #include "JSCInlines.h"
  29 #include <wtf/Assertions.h>
  30
  31 namespace JSC {
  32
  33 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(GetterSetter);
  34
  35 const ClassInfo GetterSetter::s_info = { "GetterSetter", 0, 0, 0, CREATE_METHOD_TABLE(GetterSetter) };
  36
  37 void GetterSetter::visitChildren(JSCell* cell, SlotVisitor& visitor)
  38 {
  39     GetterSetter* thisObject = jsCast<GetterSetter*>(cell);
  40     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
  41     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  42     JSCell::visitChildren(thisObject, visitor);
  43
  44     visitor.append(&thisObject->m_getter);
  45     visitor.append(&thisObject->m_setter);
  46 }
  47
  48 JSValue callGetter(ExecState* exec, JSValue base, JSValue getterSetter)
  49 {
  50     // FIXME: Some callers may invoke get() without checking for an exception first.
  51     // We work around that by checking here.
  52     if (exec->hadException())
  53         return exec->exception();
  54
  55     JSObject* getter = jsCast<GetterSetter*>(getterSetter)->getter();
  56     if (!getter)
  57         return jsUndefined();
  58
  59     CallData callData;
  60     CallType callType = getter->methodTable(exec->vm())->getCallData(getter, callData);
  61     return call(exec, getter, callType, callData, base, ArgList());
  62 }
  63
  64 void callSetter(ExecState* exec, JSValue base, JSValue getterSetter, JSValue value, ECMAMode ecmaMode)
  65 {
  66     JSObject* setter = jsCast<GetterSetter*>(getterSetter)->setter();
  67     if (!setter) {
  68         if (ecmaMode == StrictMode)
  69             throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
  70         return;
  71     }
  72
  73     MarkedArgumentBuffer args;
  74     args.append(value);
  75
  76     CallData callData;
  77     CallType callType = setter->methodTable(exec->vm())->getCallData(setter, callData);
  78     call(exec, setter, callType, callData, base, args);
  79 }
  80
  81 } // namespace JSC