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, 2014 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 "Exception.h"
  28 #include "JSObject.h"
  29 #include "JSCInlines.h"
  30 #include <wtf/Assertions.h>
  31
  32 namespace JSC {
  33
  34 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(GetterSetter);
  35
  36 const ClassInfo GetterSetter::s_info = { "GetterSetter", 0, 0, CREATE_METHOD_TABLE(GetterSetter) };
  37
  38 void GetterSetter::visitChildren(JSCell* cell, SlotVisitor& visitor)
  39 {
  40     GetterSetter* thisObject = jsCast<GetterSetter*>(cell);
  41     ASSERT_GC_OBJECT_INHERITS(thisObject, info());
  42     JSCell::visitChildren(thisObject, visitor);
  43
  44     visitor.append(&thisObject->m_getter);
  45     visitor.append(&thisObject->m_setter);
  46 }
  47
  48 GetterSetter* GetterSetter::withGetter(VM& vm, JSGlobalObject* globalObject, JSObject* newGetter)
  49 {
  50     if (isGetterNull()) {
  51         setGetter(vm, globalObject, newGetter);
  52         return this;
  53     }
  54
  55     GetterSetter* result = GetterSetter::create(vm, globalObject);
  56     result->setGetter(vm, globalObject, newGetter);
  57     result->setSetter(vm, globalObject, setter());
  58     return result;
  59 }
  60
  61 GetterSetter* GetterSetter::withSetter(VM& vm, JSGlobalObject* globalObject, JSObject* newSetter)
  62 {
  63     if (isSetterNull()) {
  64         setSetter(vm, globalObject, newSetter);
  65         return this;
  66     }
  67
  68     GetterSetter* result = GetterSetter::create(vm, globalObject);
  69     result->setGetter(vm, globalObject, getter());
  70     result->setSetter(vm, globalObject, newSetter);
  71     return result;
  72 }
  73
  74 JSValue callGetter(ExecState* exec, JSValue base, JSValue getterSetter)
  75 {
  76     // FIXME: Some callers may invoke get() without checking for an exception first.
  77     // We work around that by checking here.
  78     if (exec->hadException())
  79         return exec->exception()->value();
  80
  81     JSObject* getter = jsCast<GetterSetter*>(getterSetter)->getter();
  82
  83     CallData callData;
  84     CallType callType = getter->methodTable(exec->vm())->getCallData(getter, callData);
  85     return call(exec, getter, callType, callData, base, ArgList());
  86 }
  87
  88 void callSetter(ExecState* exec, JSValue base, JSValue getterSetter, JSValue value, ECMAMode ecmaMode)
  89 {
  90     GetterSetter* getterSetterObj = jsCast<GetterSetter*>(getterSetter);
  91
  92     if (getterSetterObj->isSetterNull()) {
  93         if (ecmaMode == StrictMode)
  94             throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
  95         return;
  96     }
  97
  98     JSObject* setter = getterSetterObj->setter();
  99
 100     MarkedArgumentBuffer args;
 101     args.append(value);
 102
 103     CallData callData;
 104     CallType callType = setter->methodTable(exec->vm())->getCallData(setter, callData);
 105     call(exec, setter, callType, callData, base, args);
 106 }
 107
 108 } // namespace JSC