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/*
* Copyright (C) 2015 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 AirCCallSpecial_h
#define AirCCallSpecial_h
#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::nonArgGPR0;
protected:
void forEachArg(Inst&, const ScopedLambda<Inst::EachArgCallback>&) override;
bool isValid(Inst&) override;
bool admitsStack(Inst&, unsigned argIndex) override;
void reportUsedRegisters(Inst&, const RegisterSet&) override;
CCallHelpers::Jump generate(Inst&, CCallHelpers&, GenerationContext&) override;
const RegisterSet& extraEarlyClobberedRegs(Inst&) override;
const RegisterSet& extraClobberedRegs(Inst&) override;
void dumpImpl(PrintStream&) const override;
void deepDumpImpl(PrintStream&) const override;
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)
#endif // AirCCallSpecial_h
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