/* * Copyright (C) 2015-2018 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. */ #pragma once #if ENABLE(B3_JIT) #include "AirSpecial.h" namespace JSC { namespace B3 { namespace Air { // Use this special for constructing a C call. Arg 0 is of course a Special arg that refers to the // CCallSpecial object. Arg 1 is the callee, and it can be an ImmPtr, a register, or an address. The // next three args - arg 2, arg 3, and arg 4 - hold the return value GPRs and FPR. The remaining args // are just the set of argument registers used by this call. For arguments that go to the stack, you // have to do the grunt work of doing those stack stores. In fact, the only reason why we specify the // argument registers as arguments to a call is so that the liveness analysis can see that they get // used here. It would be wrong to automagically report all argument registers as being used because // if we had a call that didn't pass them, then they'd appear to be live until some clobber point or // the prologue, whichever happened sooner. class CCallSpecial : public Special { public: CCallSpecial(); ~CCallSpecial(); // You cannot use this register to pass arguments. It just so happens that this register is not // used for arguments in the C calling convention. By the way, this is the only thing that causes // this special to be specific to C calls. static const GPRReg scratchRegister = GPRInfo::nonPreservedNonArgumentGPR0; protected: void forEachArg(Inst&, const ScopedLambda<Inst::EachArgCallback>&) final; bool isValid(Inst&) final; bool admitsStack(Inst&, unsigned argIndex) final; bool admitsExtendedOffsetAddr(Inst&, unsigned) final; void reportUsedRegisters(Inst&, const RegisterSet&) final; CCallHelpers::Jump generate(Inst&, CCallHelpers&, GenerationContext&) final; RegisterSet extraEarlyClobberedRegs(Inst&) final; RegisterSet extraClobberedRegs(Inst&) final; void dumpImpl(PrintStream&) const final; void deepDumpImpl(PrintStream&) const final; private: static const unsigned specialArgOffset = 0; static const unsigned numSpecialArgs = 1; static const unsigned calleeArgOffset = numSpecialArgs; static const unsigned numCalleeArgs = 1; static const unsigned returnGPArgOffset = numSpecialArgs + numCalleeArgs; static const unsigned numReturnGPArgs = 2; static const unsigned returnFPArgOffset = numSpecialArgs + numCalleeArgs + numReturnGPArgs; static const unsigned numReturnFPArgs = 1; static const unsigned argArgOffset = numSpecialArgs + numCalleeArgs + numReturnGPArgs + numReturnFPArgs; RegisterSet m_clobberedRegs; RegisterSet m_emptyRegs; }; } } } // namespace JSC::B3::Air #endif // ENABLE(B3_JIT)