DFGDesiredWriteBarriers.h [plain text]
#ifndef DFGDesiredWriteBarriers_h
#define DFGDesiredWriteBarriers_h
#include "WriteBarrier.h"
#include <wtf/Vector.h>
#if ENABLE(DFG_JIT)
namespace JSC {
class JSFunction;
class ScriptExecutable;
class SlotVisitor;
class VM;
struct InlineCallFrame;
namespace DFG {
class DesiredWriteBarrier {
public:
enum Type {
ConstantType,
InlineCallFrameExecutableType,
};
DesiredWriteBarrier(Type, CodeBlock*, unsigned index, JSCell* owner);
DesiredWriteBarrier(Type, CodeBlock*, InlineCallFrame*, JSCell* owner);
void trigger(VM&);
void visitChildren(SlotVisitor&);
private:
JSCell* m_owner;
Type m_type;
CodeBlock* m_codeBlock;
union {
unsigned index;
InlineCallFrame* inlineCallFrame;
} m_which;
};
class DesiredWriteBarriers {
public:
DesiredWriteBarriers();
~DesiredWriteBarriers();
DesiredWriteBarrier& add(DesiredWriteBarrier::Type type, CodeBlock* codeBlock, unsigned index, JSCell* owner)
{
m_barriers.append(DesiredWriteBarrier(type, codeBlock, index, owner));
return m_barriers.last();
}
DesiredWriteBarrier& add(DesiredWriteBarrier::Type type, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner)
{
m_barriers.append(DesiredWriteBarrier(type, codeBlock, inlineCallFrame, owner));
return m_barriers.last();
}
void trigger(VM&);
void visitChildren(SlotVisitor&);
private:
Vector<DesiredWriteBarrier> m_barriers;
};
inline void initializeLazyWriteBarrierForInlineCallFrameExecutable(DesiredWriteBarriers& barriers, WriteBarrier<ScriptExecutable>& barrier, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner, ScriptExecutable* value)
{
DesiredWriteBarrier& desiredBarrier = barriers.add(DesiredWriteBarrier::InlineCallFrameExecutableType, codeBlock, inlineCallFrame, owner);
barrier = WriteBarrier<ScriptExecutable>(desiredBarrier, value);
}
inline void initializeLazyWriteBarrierForConstant(DesiredWriteBarriers& barriers, WriteBarrier<Unknown>& barrier, CodeBlock* codeBlock, unsigned index, JSCell* owner, JSValue value)
{
DesiredWriteBarrier& desiredBarrier = barriers.add(DesiredWriteBarrier::ConstantType, codeBlock, index, owner);
barrier = WriteBarrier<Unknown>(desiredBarrier, value);
}
} }
#endif // ENABLE(DFG_JIT)
#endif // DFGDesiredWriteBarriers_h