projects / apple / javascriptcore.git / blame
| Commit | Line | Data |
|---|---|---|
| 81345200 A |
1 | /* |
| 2 | * Copyright (C) 2012, 2014 Apple Inc. All rights reserved. | |
| 3 | * | |
| 4 | * Redistribution and use in source and binary forms, with or without | |
| 5 | * modification, are permitted provided that the following conditions | |
| 6 | * are met: | |
| 7 | * 1. Redistributions of source code must retain the above copyright | |
| 8 | * notice, this list of conditions and the following disclaimer. | |
| 9 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 | * notice, this list of conditions and the following disclaimer in the | |
| 11 | * documentation and/or other materials provided with the distribution. | |
| 12 | * | |
| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR | |
| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 | */ | |
| 25 | ||
| 26 | #ifndef ScratchRegisterAllocator_h | |
| 27 | #define ScratchRegisterAllocator_h | |
| 28 | ||
| 29 | #if ENABLE(JIT) | |
| 30 | ||
| 31 | #include "MacroAssembler.h" | |
| 32 | #include "RegisterSet.h" | |
| 33 | #include "TempRegisterSet.h" | |
| 34 | ||
| 35 | namespace JSC { | |
| 36 | ||
| 37 | struct ScratchBuffer; | |
| 38 | ||
| 39 | // This class provides a low-level register allocator for use in stubs. | |
| 40 | ||
| 41 | class ScratchRegisterAllocator { | |
| 42 | public: | |
| 43 | ScratchRegisterAllocator(const RegisterSet& usedRegisters); | |
| 44 | ~ScratchRegisterAllocator(); | |
| 45 | ||
| 46 | void lock(GPRReg reg); | |
| 47 | void lock(FPRReg reg); | |
| 48 | ||
| 49 | template<typename BankInfo> | |
| 50 | typename BankInfo::RegisterType allocateScratch(); | |
| 51 | ||
| 52 | GPRReg allocateScratchGPR(); | |
| 53 | FPRReg allocateScratchFPR(); | |
| 54 | ||
| 55 | bool didReuseRegisters() const | |
| 56 | { | |
| 57 | return !!m_numberOfReusedRegisters; | |
| 58 | } | |
| 59 | ||
| 60 | unsigned numberOfReusedRegisters() const | |
| 61 | { | |
| 62 | return m_numberOfReusedRegisters; | |
| 63 | } | |
| 64 | ||
| 65 | void preserveReusedRegistersByPushing(MacroAssembler& jit); | |
| 66 | void restoreReusedRegistersByPopping(MacroAssembler& jit); | |
| 67 | ||
| 68 | RegisterSet usedRegistersForCall() const; | |
| 69 | ||
| 70 | unsigned desiredScratchBufferSizeForCall() const; | |
| 71 | ||
| 72 | void preserveUsedRegistersToScratchBufferForCall(MacroAssembler& jit, ScratchBuffer* scratchBuffer, GPRReg scratchGPR = InvalidGPRReg); | |
| 73 | ||
| 74 | void restoreUsedRegistersFromScratchBufferForCall(MacroAssembler& jit, ScratchBuffer* scratchBuffer, GPRReg scratchGPR = InvalidGPRReg); | |
| 75 | ||
| 76 | private: | |
| 77 | RegisterSet m_usedRegisters; | |
| 78 | TempRegisterSet m_lockedRegisters; | |
| 79 | TempRegisterSet m_scratchRegisters; | |
| 80 | unsigned m_numberOfReusedRegisters; | |
| 81 | }; | |
| 82 | ||
| 83 | } // namespace JSC | |
| 84 | ||
| 85 | #endif // ENABLE(JIT) | |
| 86 | ||
| 87 | #endif // ScratchRegisterAllocator_h |