1 //===- X86RegisterInfo.h - X86 Register Information Impl --------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file contains the X86 implementation of the TargetRegisterInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef X86REGISTERINFO_H 15 #define X86REGISTERINFO_H 16 17 #include "llvm/Target/TargetRegisterInfo.h" 18 19 #define GET_REGINFO_HEADER 20 #include "X86GenRegisterInfo.inc" 21 22 namespace llvm { 23 class Type; 24 class TargetInstrInfo; 25 class X86TargetMachine; 26 27 class X86RegisterInfo : public X86GenRegisterInfo { 28 public: 29 X86TargetMachine &TM; 30 const TargetInstrInfo &TII; 31 32 private: 33 /// Is64Bit - Is the target 64-bits. 34 /// 35 bool Is64Bit; 36 37 /// IsWin64 - Is the target on of win64 flavours 38 /// 39 bool IsWin64; 40 41 /// SlotSize - Stack slot size in bytes. 42 /// 43 unsigned SlotSize; 44 45 /// StackPtr - X86 physical register used as stack ptr. 46 /// 47 unsigned StackPtr; 48 49 /// FramePtr - X86 physical register used as frame ptr. 50 /// 51 unsigned FramePtr; 52 53 public: 54 X86RegisterInfo(X86TargetMachine &tm, const TargetInstrInfo &tii); 55 56 /// getX86RegNum - Returns the native X86 register number for the given LLVM 57 /// register identifier. 58 static unsigned getX86RegNum(unsigned RegNo); 59 60 // FIXME: This should be tablegen'd like getDwarfRegNum is 61 int getSEHRegNum(unsigned i) const; 62 63 /// getCompactUnwindRegNum - This function maps the register to the number for 64 /// compact unwind encoding. Return -1 if the register isn't valid. 65 int getCompactUnwindRegNum(unsigned RegNum, bool isEH) const; 66 67 /// Code Generation virtual methods... 68 /// 69 70 /// getMatchingSuperRegClass - Return a subclass of the specified register 71 /// class A so that each register in it has a sub-register of the 72 /// specified sub-register index which is in the specified register class B. 73 virtual const TargetRegisterClass * 74 getMatchingSuperRegClass(const TargetRegisterClass *A, 75 const TargetRegisterClass *B, unsigned Idx) const; 76 77 virtual const TargetRegisterClass * 78 getSubClassWithSubReg(const TargetRegisterClass *RC, unsigned Idx) const; 79 80 const TargetRegisterClass* 81 getLargestLegalSuperClass(const TargetRegisterClass *RC) const; 82 83 /// getPointerRegClass - Returns a TargetRegisterClass used for pointer 84 /// values. 85 const TargetRegisterClass *getPointerRegClass(unsigned Kind = 0) const; 86 87 /// getCrossCopyRegClass - Returns a legal register class to copy a register 88 /// in the specified class to or from. Returns NULL if it is possible to copy 89 /// between a two registers of the specified class. 90 const TargetRegisterClass * 91 getCrossCopyRegClass(const TargetRegisterClass *RC) const; 92 93 unsigned getRegPressureLimit(const TargetRegisterClass *RC, 94 MachineFunction &MF) const; 95 96 /// getCalleeSavedRegs - Return a null-terminated list of all of the 97 /// callee-save registers on this target. 98 const unsigned *getCalleeSavedRegs(const MachineFunction* MF = 0) const; 99 100 /// getReservedRegs - Returns a bitset indexed by physical register number 101 /// indicating if a register is a special register that has particular uses and 102 /// should be considered unavailable at all times, e.g. SP, RA. This is used by 103 /// register scavenger to determine what registers are free. 104 BitVector getReservedRegs(const MachineFunction &MF) const; 105 106 bool canRealignStack(const MachineFunction &MF) const; 107 108 bool needsStackRealignment(const MachineFunction &MF) const; 109 110 bool hasReservedSpillSlot(const MachineFunction &MF, unsigned Reg, 111 int &FrameIdx) const; 112 113 void eliminateCallFramePseudoInstr(MachineFunction &MF, 114 MachineBasicBlock &MBB, 115 MachineBasicBlock::iterator MI) const; 116 117 void eliminateFrameIndex(MachineBasicBlock::iterator MI, 118 int SPAdj, RegScavenger *RS = NULL) const; 119 120 // Debug information queries. 121 unsigned getFrameRegister(const MachineFunction &MF) const; 122 unsigned getStackRegister() const { return StackPtr; } 123 // FIXME: Move to FrameInfok 124 unsigned getSlotSize() const { return SlotSize; } 125 126 // Exception handling queries. 127 unsigned getEHExceptionRegister() const; 128 unsigned getEHHandlerRegister() const; 129 }; 130 131 // getX86SubSuperRegister - X86 utility function. It returns the sub or super 132 // register of a specific X86 register. 133 // e.g. getX86SubSuperRegister(X86::EAX, EVT::i16) return X86:AX 134 unsigned getX86SubSuperRegister(unsigned, EVT, bool High=false); 135 136 } // End llvm namespace 137 138 #endif 139
