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/*
* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef JSVariableObject_h
#define JSVariableObject_h
#include "LocalStorage.h"
#include "SymbolTable.h"
#include "object.h"
namespace KJS {
class JSVariableObject : public JSObject {
public:
SymbolTable& symbolTable() { return *d->symbolTable; }
LocalStorage& localStorage() { return d->localStorage; }
void saveLocalStorage(SavedProperties&) const;
void restoreLocalStorage(const SavedProperties&);
virtual bool deleteProperty(ExecState*, const Identifier&);
virtual void getPropertyNames(ExecState*, PropertyNameArray&);
virtual void mark();
protected:
// Subclasses of JSVariableObject can subclass this struct to add data
// without increasing their own size (since there's a hard limit on the
// size of a JSCell).
struct JSVariableObjectData {
JSVariableObjectData() { }
JSVariableObjectData(SymbolTable* s)
: symbolTable(s) // Subclass owns this pointer.
{
}
LocalStorage localStorage; // Storage for variables in the symbol table.
SymbolTable* symbolTable; // Maps name -> index in localStorage.
};
JSVariableObject() { }
JSVariableObject(JSVariableObjectData* data)
: d(data) // Subclass owns this pointer.
{
}
JSVariableObject(JSValue* proto, JSVariableObjectData* data)
: JSObject(proto)
, d(data) // Subclass owns this pointer.
{
}
bool symbolTableGet(const Identifier&, PropertySlot&);
bool symbolTablePut(const Identifier&, JSValue*, bool checkReadOnly);
JSVariableObjectData* d;
};
inline bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
{
size_t index = symbolTable().get(propertyName.ustring().rep());
if (index != missingSymbolMarker()) {
#ifndef NDEBUG
// During initialization, the variable object needs to advertise that it has certain
// properties, even if they're not ready for access yet. This check verifies that
// no one tries to access such a property.
// In a release build, we optimize this check away and just return an invalid pointer.
// There's no harm in an invalid pointer, since no one dereferences it.
if (index >= d->localStorage.size()) {
slot.setUngettable(this);
return true;
}
#endif
slot.setValueSlot(this, &d->localStorage[index].value);
return true;
}
return false;
}
inline bool JSVariableObject::symbolTablePut(const Identifier& propertyName, JSValue* value, bool checkReadOnly)
{
size_t index = symbolTable().get(propertyName.ustring().rep());
if (index == missingSymbolMarker())
return false;
LocalStorageEntry& entry = d->localStorage[index];
if (checkReadOnly && (entry.attributes & ReadOnly))
return true;
entry.value = value;
return true;
}
} // namespace KJS
#endif // JSVariableObject_h
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