runtime/JSVariableObject.cpp

   1 /*
   2  * Copyright (C) 2007, 2008 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  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "config.h"
  30 #include "JSVariableObject.h"
  31
  32 #include "JSActivation.h"
  33 #include "JSGlobalObject.h"
  34 #include "JSStaticScopeObject.h"
  35 #include "PropertyNameArray.h"
  36 #include "PropertyDescriptor.h"
  37
  38 namespace JSC {
  39
  40 void JSVariableObject::destroy(JSCell* cell)
  41 {
  42     jsCast<JSVariableObject*>(cell)->JSVariableObject::~JSVariableObject();
  43 }
  44
  45 bool JSVariableObject::deleteProperty(JSCell* cell, ExecState* exec, const Identifier& propertyName)
  46 {
  47     JSVariableObject* thisObject = jsCast<JSVariableObject*>(cell);
  48     if (thisObject->symbolTable().contains(propertyName.impl()))
  49         return false;
  50
  51     return JSObject::deleteProperty(thisObject, exec, propertyName);
  52 }
  53
  54 void JSVariableObject::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
  55 {
  56     JSVariableObject* thisObject = jsCast<JSVariableObject*>(object);
  57     SymbolTable::const_iterator end = thisObject->symbolTable().end();
  58     for (SymbolTable::const_iterator it = thisObject->symbolTable().begin(); it != end; ++it) {
  59         if (!(it->second.getAttributes() & DontEnum) || (mode == IncludeDontEnumProperties))
  60             propertyNames.add(Identifier(exec, it->first.get()));
  61     }
  62
  63     JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
  64 }
  65
  66 bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertyDescriptor& descriptor)
  67 {
  68     SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
  69     if (!entry.isNull()) {
  70         descriptor.setDescriptor(registerAt(entry.getIndex()).get(), entry.getAttributes() | DontDelete);
  71         return true;
  72     }
  73     return false;
  74 }
  75
  76 void JSVariableObject::putDirectVirtual(JSObject*, ExecState*, const Identifier&, JSValue, unsigned)
  77 {
  78     ASSERT_NOT_REACHED();
  79 }
  80
  81 bool JSVariableObject::isDynamicScope(bool& requiresDynamicChecks) const
  82 {
  83     switch (structure()->typeInfo().type()) {
  84     case GlobalObjectType:
  85         return static_cast<const JSGlobalObject*>(this)->isDynamicScope(requiresDynamicChecks);
  86     case ActivationObjectType:
  87         return static_cast<const JSActivation*>(this)->isDynamicScope(requiresDynamicChecks);
  88     case StaticScopeObjectType:
  89         return static_cast<const JSStaticScopeObject*>(this)->isDynamicScope(requiresDynamicChecks);
  90     default:
  91         ASSERT_NOT_REACHED();
  92         break;
  93     }
  94
  95     return false;
  96 }
  97
  98 } // namespace JSC