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/*
* Copyright (C) 2015-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* 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
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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*/
#pragma once
#if ENABLE(B3_JIT)
#include "AirSpecial.h"
#include "RegisterSet.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 final : public Special {
public:
CCallSpecial();
~CCallSpecial() final;
// 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 constexpr GPRReg scratchRegister = GPRInfo::nonPreservedNonArgumentGPR0;
private:
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;
MacroAssembler::Jump generate(Inst&, CCallHelpers&, GenerationContext&) final;
RegisterSet extraEarlyClobberedRegs(Inst&) final;
RegisterSet extraClobberedRegs(Inst&) final;
void dumpImpl(PrintStream&) const final;
void deepDumpImpl(PrintStream&) const final;
static constexpr unsigned specialArgOffset = 0;
static constexpr unsigned numSpecialArgs = 1;
static constexpr unsigned calleeArgOffset = numSpecialArgs;
static constexpr unsigned numCalleeArgs = 1;
static constexpr unsigned returnGPArgOffset = numSpecialArgs + numCalleeArgs;
static constexpr unsigned numReturnGPArgs = 2;
static constexpr unsigned returnFPArgOffset = numSpecialArgs + numCalleeArgs + numReturnGPArgs;
static constexpr unsigned numReturnFPArgs = 1;
static constexpr unsigned argArgOffset =
numSpecialArgs + numCalleeArgs + numReturnGPArgs + numReturnFPArgs;
RegisterSet m_clobberedRegs;
RegisterSet m_emptyRegs;
};
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)