1 //===-- llvm/MC/MachineLocation.h -------------------------------*- 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 // The MachineLocation class is used to represent a simple location in a machine 10 // frame. Locations will be one of two forms; a register or an address formed 11 // from a base address plus an offset. Register indirection can be specified by 12 // explicitly passing an offset to the constructor. 13 //===----------------------------------------------------------------------===// 14 15 16 #ifndef LLVM_MC_MACHINELOCATION_H 17 #define LLVM_MC_MACHINELOCATION_H 18 19 #include "llvm/Support/Compiler.h" 20 #include "llvm/Support/DataTypes.h" 21 22 namespace llvm { 23 class MCSymbol; 24 25 class MachineLocation { 26 private: 27 bool IsRegister; // True if location is a register. 28 unsigned Register; // gcc/gdb register number. 29 int Offset; // Displacement if not register. 30 public: 31 enum : uint32_t { 32 // The target register number for an abstract frame pointer. The value is 33 // an arbitrary value that doesn't collide with any real target register. 34 VirtualFP = ~0U 35 }; 36 MachineLocation() 37 : IsRegister(false), Register(0), Offset(0) {} 38 /// Create a direct register location. 39 explicit MachineLocation(unsigned R) 40 : IsRegister(true), Register(R), Offset(0) {} 41 /// Create a register-indirect location with an offset. 42 MachineLocation(unsigned R, int O) 43 : IsRegister(false), Register(R), Offset(O) {} 44 45 bool operator==(const MachineLocation &Other) const { 46 return IsRegister == Other.IsRegister && Register == Other.Register && 47 Offset == Other.Offset; 48 } 49 50 // Accessors. 51 /// \return true iff this is a register-indirect location. 52 bool isIndirect() const { return !IsRegister; } 53 bool isReg() const { return IsRegister; } 54 unsigned getReg() const { return Register; } 55 int getOffset() const { return Offset; } 56 void setIsRegister(bool Is) { IsRegister = Is; } 57 void setRegister(unsigned R) { Register = R; } 58 void setOffset(int O) { Offset = O; } 59 /// Make this location a direct register location. 60 void set(unsigned R) { 61 IsRegister = true; 62 Register = R; 63 Offset = 0; 64 } 65 /// Make this location a register-indirect+offset location. 66 void set(unsigned R, int O) { 67 IsRegister = false; 68 Register = R; 69 Offset = O; 70 } 71 72 #ifndef NDEBUG 73 void dump(); 74 #endif 75 }; 76 77 inline bool operator!=(const MachineLocation &LHS, const MachineLocation &RHS) { 78 return !(LHS == RHS); 79 } 80 81 } // End llvm namespace 82 83 #endif 84
