| /* |
| * Copyright (C) 2012 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. ``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 |
| * 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 DFGRegisterSet_h |
| #define DFGRegisterSet_h |
| |
| #include <wtf/Platform.h> |
| |
| #if ENABLE(DFG_JIT) |
| |
| #include "DFGFPRInfo.h" |
| #include "DFGGPRInfo.h" |
| #include <wtf/Bitmap.h> |
| |
| namespace JSC { namespace DFG { |
| |
| static const unsigned totalNumberOfRegisters = |
| GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters; |
| |
| static const unsigned numberOfBytesInRegisterSet = |
| (totalNumberOfRegisters + 7) >> 3; |
| |
| typedef uint8_t RegisterSetPOD[numberOfBytesInRegisterSet]; |
| |
| class RegisterSet { |
| public: |
| RegisterSet() |
| { |
| for (unsigned i = numberOfBytesInRegisterSet; i--;) |
| m_set[i] = 0; |
| } |
| |
| RegisterSet(const RegisterSetPOD& other) |
| { |
| for (unsigned i = numberOfBytesInRegisterSet; i--;) |
| m_set[i] = other[i]; |
| } |
| |
| const RegisterSetPOD& asPOD() const { return m_set; } |
| |
| void copyInfo(RegisterSetPOD& other) const |
| { |
| for (unsigned i = numberOfBytesInRegisterSet; i--;) |
| other[i] = m_set[i]; |
| } |
| |
| void set(GPRReg reg) |
| { |
| setBit(GPRInfo::toIndex(reg)); |
| } |
| |
| void setGPRByIndex(unsigned index) |
| { |
| ASSERT(index < GPRInfo::numberOfRegisters); |
| setBit(index); |
| } |
| |
| void clear(GPRReg reg) |
| { |
| clearBit(GPRInfo::toIndex(reg)); |
| } |
| |
| bool get(GPRReg reg) const |
| { |
| return getBit(GPRInfo::toIndex(reg)); |
| } |
| |
| bool getGPRByIndex(unsigned index) const |
| { |
| ASSERT(index < GPRInfo::numberOfRegisters); |
| return getBit(index); |
| } |
| |
| // Return the index'th free GPR. |
| GPRReg getFreeGPR(unsigned index = 0) const |
| { |
| for (unsigned i = GPRInfo::numberOfRegisters; i--;) { |
| if (!getGPRByIndex(i) && !index--) |
| return GPRInfo::toRegister(i); |
| } |
| return InvalidGPRReg; |
| } |
| |
| void set(FPRReg reg) |
| { |
| setBit(GPRInfo::numberOfRegisters + FPRInfo::toIndex(reg)); |
| } |
| |
| void setFPRByIndex(unsigned index) |
| { |
| ASSERT(index < FPRInfo::numberOfRegisters); |
| setBit(GPRInfo::numberOfRegisters + index); |
| } |
| |
| void clear(FPRReg reg) |
| { |
| clearBit(GPRInfo::numberOfRegisters + FPRInfo::toIndex(reg)); |
| } |
| |
| bool get(FPRReg reg) const |
| { |
| return getBit(GPRInfo::numberOfRegisters + FPRInfo::toIndex(reg)); |
| } |
| |
| bool getFPRByIndex(unsigned index) const |
| { |
| ASSERT(index < FPRInfo::numberOfRegisters); |
| return getBit(GPRInfo::numberOfRegisters + index); |
| } |
| |
| template<typename BankInfo> |
| void setByIndex(unsigned index) |
| { |
| set(BankInfo::toRegister(index)); |
| } |
| |
| template<typename BankInfo> |
| bool getByIndex(unsigned index) |
| { |
| return get(BankInfo::toRegister(index)); |
| } |
| |
| unsigned numberOfSetGPRs() const |
| { |
| unsigned result = 0; |
| for (unsigned i = GPRInfo::numberOfRegisters; i--;) { |
| if (!getBit(i)) |
| continue; |
| result++; |
| } |
| return result; |
| } |
| |
| unsigned numberOfSetFPRs() const |
| { |
| unsigned result = 0; |
| for (unsigned i = FPRInfo::numberOfRegisters; i--;) { |
| if (!getBit(GPRInfo::numberOfRegisters + i)) |
| continue; |
| result++; |
| } |
| return result; |
| } |
| |
| unsigned numberOfSetRegisters() const |
| { |
| unsigned result = 0; |
| for (unsigned i = totalNumberOfRegisters; i--;) { |
| if (!getBit(i)) |
| continue; |
| result++; |
| } |
| return result; |
| } |
| |
| private: |
| void setBit(unsigned i) |
| { |
| ASSERT(i < totalNumberOfRegisters); |
| m_set[i >> 3] |= (1 << (i & 7)); |
| } |
| |
| void clearBit(unsigned i) |
| { |
| ASSERT(i < totalNumberOfRegisters); |
| m_set[i >> 3] &= ~(1 << (i & 7)); |
| } |
| |
| bool getBit(unsigned i) const |
| { |
| ASSERT(i < totalNumberOfRegisters); |
| return !!(m_set[i >> 3] & (1 << (i & 7))); |
| } |
| |
| RegisterSetPOD m_set; |
| }; |
| |
| } } // namespace JSC::DFG |
| |
| #else // ENABLE(DFG_JIT) -> so if DFG is disabled |
| |
| namespace JSC { namespace DFG { |
| |
| // Define RegisterSetPOD to something that is a POD, but is otherwise useless, |
| // to make it easier to refer to this type in code that may be compiled when |
| // the DFG is disabled. |
| |
| struct RegisterSetPOD { }; |
| |
| } } // namespace JSC::DFG |
| |
| #endif // ENABLE(DFG_JIT) |
| |
| #endif // DFGRegisterSet_h |
| |