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/*
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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.
*/
#ifndef GeneratorFrame_h
#define GeneratorFrame_h
#include "JSCell.h"
#include <wtf/FastBitVector.h>
namespace JSC {
class GeneratorFrame : public JSCell {
friend class JIT;
#if ENABLE(DFG_JIT)
friend class DFG::SpeculativeJIT;
friend class DFG::JITCompiler;
#endif
friend class VM;
public:
typedef JSCell Base;
static const unsigned StructureFlags = StructureIsImmortal | Base::StructureFlags;
DECLARE_EXPORT_INFO;
static GeneratorFrame* create(VM&, size_t numberOfCalleeLocals);
WriteBarrierBase<Unknown>* locals()
{
return bitwise_cast<WriteBarrierBase<Unknown>*>(bitwise_cast<char*>(this) + offsetOfLocals());
}
WriteBarrierBase<Unknown>& localAt(size_t index)
{
ASSERT(index < m_numberOfCalleeLocals);
return locals()[index];
}
static size_t offsetOfLocals()
{
return WTF::roundUpToMultipleOf<sizeof(WriteBarrier<Unknown>)>(sizeof(GeneratorFrame));
}
static size_t allocationSizeForLocals(unsigned numberOfLocals)
{
return offsetOfLocals() + numberOfLocals * sizeof(WriteBarrier<Unknown>);
}
static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
void save(ExecState*, const FastBitVector& liveCalleeLocals);
void resume(ExecState*, const FastBitVector& liveCalleeLocals);
private:
GeneratorFrame(VM&, size_t numberOfCalleeLocals);
size_t m_numberOfCalleeLocals;
friend class LLIntOffsetsExtractor;
void finishCreation(VM&);
protected:
static void visitChildren(JSCell*, SlotVisitor&);
};
} // namespace JSC
#endif // GeneratorFrame_h
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