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/*
* Copyright (C) 2016 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
*/
#pragma once
#include "LazyProperty.h"
#include "Structure.h"
namespace JSC {
class JSGlobalObject;
class VM;
class LazyClassStructure {
typedef LazyProperty<JSGlobalObject, Structure>::Initializer StructureInitializer;
public:
struct Initializer {
Initializer(VM&, JSGlobalObject*, LazyClassStructure&, const StructureInitializer&);
// This should be called first or not at all.
void setPrototype(JSObject* prototype);
// If this is called after setPrototype() then it just sets the structure. If this is
// called first then it sets the prototype by extracting it from the structure.
void setStructure(Structure*);
// Call this last. It's expected that the constructor is initialized to point to the
// prototype already. This will automatically set prototype.constructor=constructor.
// This will also stuff the constructor into the global object at the given property.
// Note that the variant that does not take a property name attempts to deduce it by
// casting constructor to either JSFunction or InternalFunction. Also, you can pass
// nullptr for the property name, in which case we don't assign the property to the
// global object.
void setConstructor(PropertyName, JSObject* constructor);
void setConstructor(JSObject* constructor);
VM& vm;
JSGlobalObject* global;
LazyClassStructure& classStructure;
const StructureInitializer& structureInit;
// It's expected that you set these using the set methods above.
JSObject* prototype { nullptr };
Structure* structure { nullptr };
JSObject* constructor { nullptr };
};
LazyClassStructure()
{
}
template<typename Callback>
void initLater(const Callback&);
Structure* get(const JSGlobalObject* global) const
{
ASSERT(!isCompilationThread());
return m_structure.get(global);
}
JSObject* prototype(const JSGlobalObject* global) const
{
ASSERT(!isCompilationThread());
return get(global)->storedPrototypeObject();
}
// Almost as an afterthought, we also support getting the original constructor. This turns
// out to be important for ES6 support.
JSObject* constructor(const JSGlobalObject* global) const
{
ASSERT(!isCompilationThread());
m_structure.get(global);
return m_constructor.get();
}
Structure* getConcurrently() const
{
return m_structure.getConcurrently();
}
JSObject* prototypeConcurrently() const
{
if (Structure* structure = getConcurrently())
return structure->storedPrototypeObject();
return nullptr;
}
JSObject* constructorConcurrently() const
{
return m_constructor.get();
}
void visit(SlotVisitor&);
void dump(PrintStream&) const;
private:
LazyProperty<JSGlobalObject, Structure> m_structure;
WriteBarrier<JSObject> m_constructor;
};
} // namespace JSC
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