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//===-- X86RegisterInfo.h - X86 Register Information Impl -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the X86 implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_X86REGISTERINFO_H
#define LLVM_LIB_TARGET_X86_X86REGISTERINFO_H
#include "llvm/CodeGen/TargetRegisterInfo.h"
#define GET_REGINFO_HEADER
#include "X86GenRegisterInfo.inc"
namespace llvm {
class Triple;
class X86RegisterInfo final : public X86GenRegisterInfo {
private:
/// Is64Bit - Is the target 64-bits.
///
bool Is64Bit;
/// IsWin64 - Is the target on of win64 flavours
///
bool IsWin64;
/// SlotSize - Stack slot size in bytes.
///
unsigned SlotSize;
/// StackPtr - X86 physical register used as stack ptr.
///
unsigned StackPtr;
/// FramePtr - X86 physical register used as frame ptr.
///
unsigned FramePtr;
/// BasePtr - X86 physical register used as a base ptr in complex stack
/// frames. I.e., when we need a 3rd base, not just SP and FP, due to
/// variable size stack objects.
unsigned BasePtr;
public:
explicit X86RegisterInfo(const Triple &TT);
/// Return the number of registers for the function.
unsigned getNumSupportedRegs(const MachineFunction &MF) const override;
// FIXME: This should be tablegen'd like getDwarfRegNum is
int getSEHRegNum(unsigned i) const;
/// getMatchingSuperRegClass - Return a subclass of the specified register
/// class A so that each register in it has a sub-register of the
/// specified sub-register index which is in the specified register class B.
const TargetRegisterClass *
getMatchingSuperRegClass(const TargetRegisterClass *A,
const TargetRegisterClass *B,
unsigned Idx) const override;
const TargetRegisterClass *
getSubClassWithSubReg(const TargetRegisterClass *RC,
unsigned Idx) const override;
const TargetRegisterClass *
getLargestLegalSuperClass(const TargetRegisterClass *RC,
const MachineFunction &MF) const override;
bool shouldRewriteCopySrc(const TargetRegisterClass *DefRC,
unsigned DefSubReg,
const TargetRegisterClass *SrcRC,
unsigned SrcSubReg) const override;
/// getPointerRegClass - Returns a TargetRegisterClass used for pointer
/// values.
const TargetRegisterClass *
getPointerRegClass(const MachineFunction &MF,
unsigned Kind = 0) const override;
/// getCrossCopyRegClass - Returns a legal register class to copy a register
/// in the specified class to or from. Returns NULL if it is possible to copy
/// between a two registers of the specified class.
const TargetRegisterClass *
getCrossCopyRegClass(const TargetRegisterClass *RC) const override;
/// getGPRsForTailCall - Returns a register class with registers that can be
/// used in forming tail calls.
const TargetRegisterClass *
getGPRsForTailCall(const MachineFunction &MF) const;
unsigned getRegPressureLimit(const TargetRegisterClass *RC,
MachineFunction &MF) const override;
/// getCalleeSavedRegs - Return a null-terminated list of all of the
/// callee-save registers on this target.
const MCPhysReg *
getCalleeSavedRegs(const MachineFunction* MF) const override;
const MCPhysReg *
getCalleeSavedRegsViaCopy(const MachineFunction *MF) const;
const uint32_t *getCallPreservedMask(const MachineFunction &MF,
CallingConv::ID) const override;
const uint32_t *getNoPreservedMask() const override;
// Calls involved in thread-local variable lookup save more registers than
// normal calls, so they need a different mask to represent this.
const uint32_t *getDarwinTLSCallPreservedMask() const;
/// getReservedRegs - Returns a bitset indexed by physical register number
/// indicating if a register is a special register that has particular uses and
/// should be considered unavailable at all times, e.g. SP, RA. This is used by
/// register scavenger to determine what registers are free.
BitVector getReservedRegs(const MachineFunction &MF) const override;
/// isArgumentReg - Returns true if Reg can be used as an argument to a
/// function.
bool isArgumentRegister(const MachineFunction &MF,
MCRegister Reg) const override;
/// Return true if it is tile register class.
bool isTileRegisterClass(const TargetRegisterClass *RC) const;
/// Returns true if PhysReg is a fixed register.
bool isFixedRegister(const MachineFunction &MF,
MCRegister PhysReg) const override;
void adjustStackMapLiveOutMask(uint32_t *Mask) const override;
bool hasBasePointer(const MachineFunction &MF) const;
bool canRealignStack(const MachineFunction &MF) const override;
bool shouldRealignStack(const MachineFunction &MF) const override;
void eliminateFrameIndex(MachineBasicBlock::iterator II,
unsigned FIOperandNum, Register BaseReg,
int FIOffset) const;
bool eliminateFrameIndex(MachineBasicBlock::iterator MI,
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS = nullptr) const override;
/// Process frame indices in forwards block order because
/// X86InstrInfo::getSPAdjust relies on it when searching for the
/// ADJCALLSTACKUP pseudo following a call.
/// TODO: Fix this and return true like all other targets.
bool eliminateFrameIndicesBackwards() const override { return false; }
/// findDeadCallerSavedReg - Return a caller-saved register that isn't live
/// when it reaches the "return" instruction. We can then pop a stack object
/// to this register without worry about clobbering it.
unsigned findDeadCallerSavedReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI) const;
// Debug information queries.
Register getFrameRegister(const MachineFunction &MF) const override;
unsigned getPtrSizedFrameRegister(const MachineFunction &MF) const;
unsigned getPtrSizedStackRegister(const MachineFunction &MF) const;
Register getStackRegister() const { return StackPtr; }
Register getBaseRegister() const { return BasePtr; }
/// Returns physical register used as frame pointer.
/// This will always returns the frame pointer register, contrary to
/// getFrameRegister() which returns the "base pointer" in situations
/// involving a stack, frame and base pointer.
Register getFramePtr() const { return FramePtr; }
// FIXME: Move to FrameInfok
unsigned getSlotSize() const { return SlotSize; }
bool getRegAllocationHints(Register VirtReg, ArrayRef<MCPhysReg> Order,
SmallVectorImpl<MCPhysReg> &Hints,
const MachineFunction &MF, const VirtRegMap *VRM,
const LiveRegMatrix *Matrix) const override;
};
} // End llvm namespace
#endif
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