107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
/*
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* Copyright (C) 2012-2021 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#if ENABLE(JIT)
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#include "RegisterSet.h"
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#include "TempRegisterSet.h"
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namespace JSC {
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class AssemblyHelpers;
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struct ScratchBuffer;
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// This class provides a low-level register allocator for use in stubs.
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class ScratchRegisterAllocator {
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public:
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ScratchRegisterAllocator() { }
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ScratchRegisterAllocator(const RegisterSet& usedRegisters);
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~ScratchRegisterAllocator();
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void lock(GPRReg);
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void lock(FPRReg);
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void lock(JSValueRegs);
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template<typename BankInfo>
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typename BankInfo::RegisterType allocateScratch();
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GPRReg allocateScratchGPR();
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FPRReg allocateScratchFPR();
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bool didReuseRegisters() const
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{
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return !!m_numberOfReusedRegisters;
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}
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unsigned numberOfReusedRegisters() const
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{
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return m_numberOfReusedRegisters;
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}
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RegisterSet usedRegisters() const { return m_usedRegisters; }
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enum class ExtraStackSpace { SpaceForCCall, NoExtraSpace };
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struct PreservedState {
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PreservedState()
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: numberOfBytesPreserved(std::numeric_limits<unsigned>::max())
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, extraStackSpaceRequirement(ExtraStackSpace::SpaceForCCall)
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{ }
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PreservedState(unsigned numberOfBytes, ExtraStackSpace extraStackSpace)
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: numberOfBytesPreserved(numberOfBytes)
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, extraStackSpaceRequirement(extraStackSpace)
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{ }
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explicit operator bool() const { return numberOfBytesPreserved != std::numeric_limits<unsigned>::max(); }
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unsigned numberOfBytesPreserved;
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ExtraStackSpace extraStackSpaceRequirement;
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};
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PreservedState preserveReusedRegistersByPushing(AssemblyHelpers& jit, ExtraStackSpace);
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void restoreReusedRegistersByPopping(AssemblyHelpers& jit, const PreservedState&);
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RegisterSet usedRegistersForCall() const;
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unsigned desiredScratchBufferSizeForCall() const;
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static unsigned preserveRegistersToStackForCall(AssemblyHelpers& jit, const RegisterSet& usedRegisters, unsigned extraPaddingInBytes);
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static void restoreRegistersFromStackForCall(AssemblyHelpers& jit, const RegisterSet& usedRegisters, const RegisterSet& ignore, unsigned numberOfStackBytesUsedForRegisterPreservation, unsigned extraPaddingInBytes);
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private:
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RegisterSet m_usedRegisters;
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TempRegisterSet m_lockedRegisters;
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TempRegisterSet m_scratchRegisters;
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unsigned m_numberOfReusedRegisters;
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};
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} // namespace JSC
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#endif // ENABLE(JIT)
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