ScratchRegisterAllocator.h [plain text]
#ifndef ScratchRegisterAllocator_h
#define ScratchRegisterAllocator_h
#if ENABLE(JIT)
#include "MacroAssembler.h"
#include "RegisterSet.h"
#include "TempRegisterSet.h"
namespace JSC {
struct ScratchBuffer;
class ScratchRegisterAllocator {
public:
ScratchRegisterAllocator(const RegisterSet& usedRegisters);
~ScratchRegisterAllocator();
void lock(GPRReg reg);
void lock(FPRReg reg);
template<typename BankInfo>
typename BankInfo::RegisterType allocateScratch();
GPRReg allocateScratchGPR();
FPRReg allocateScratchFPR();
bool didReuseRegisters() const
{
return !!m_numberOfReusedRegisters;
}
unsigned numberOfReusedRegisters() const
{
return m_numberOfReusedRegisters;
}
void preserveReusedRegistersByPushing(MacroAssembler& jit);
void restoreReusedRegistersByPopping(MacroAssembler& jit);
RegisterSet usedRegistersForCall() const;
unsigned desiredScratchBufferSizeForCall() const;
void preserveUsedRegistersToScratchBufferForCall(MacroAssembler& jit, ScratchBuffer* scratchBuffer, GPRReg scratchGPR = InvalidGPRReg);
void restoreUsedRegistersFromScratchBufferForCall(MacroAssembler& jit, ScratchBuffer* scratchBuffer, GPRReg scratchGPR = InvalidGPRReg);
private:
RegisterSet m_usedRegisters;
TempRegisterSet m_lockedRegisters;
TempRegisterSet m_scratchRegisters;
unsigned m_numberOfReusedRegisters;
};
}
#endif // ENABLE(JIT)
#endif // ScratchRegisterAllocator_h