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 // using an offset of zero. 13 // 14 // The MachineMove class is used to represent abstract move operations in the 15 // prolog/epilog of a compiled function. A collection of these objects can be 16 // used by a debug consumer to track the location of values when unwinding stack 17 // frames. 18 //===----------------------------------------------------------------------===// 19 20 21 #ifndef LLVM_MC_MACHINELOCATION_H 22 #define LLVM_MC_MACHINELOCATION_H 23 24 namespace llvm { 25 class MCSymbol; 26 27 class MachineLocation { 28 private: 29 bool IsRegister; // True if location is a register. 30 unsigned Register; // gcc/gdb register number. 31 int Offset; // Displacement if not register. 32 public: 33 enum { 34 // The target register number for an abstract frame pointer. The value is 35 // an arbitrary value that doesn't collide with any real target register. 36 VirtualFP = ~0U 37 }; 38 MachineLocation() 39 : IsRegister(false), Register(0), Offset(0) {} 40 explicit MachineLocation(unsigned R) 41 : IsRegister(true), Register(R), Offset(0) {} 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 bool isReg() const { return IsRegister; } 52 unsigned getReg() const { return Register; } 53 int getOffset() const { return Offset; } 54 void setIsRegister(bool Is) { IsRegister = Is; } 55 void setRegister(unsigned R) { Register = R; } 56 void setOffset(int O) { Offset = O; } 57 void set(unsigned R) { 58 IsRegister = true; 59 Register = R; 60 Offset = 0; 61 } 62 void set(unsigned R, int O) { 63 IsRegister = false; 64 Register = R; 65 Offset = O; 66 } 67 68 #ifndef NDEBUG 69 void dump(); 70 #endif 71 }; 72 73 /// MachineMove - This class represents the save or restore of a callee saved 74 /// register that exception or debug info needs to know about. 75 class MachineMove { 76 private: 77 /// Label - Symbol for post-instruction address when result of move takes 78 /// effect. 79 MCSymbol *Label; 80 81 // Move to & from location. 82 MachineLocation Destination, Source; 83 public: 84 MachineMove() : Label(0) {} 85 86 MachineMove(MCSymbol *label, const MachineLocation &D, 87 const MachineLocation &S) 88 : Label(label), Destination(D), Source(S) {} 89 90 // Accessors 91 MCSymbol *getLabel() const { return Label; } 92 const MachineLocation &getDestination() const { return Destination; } 93 const MachineLocation &getSource() const { return Source; } 94 }; 95 96 } // End llvm namespace 97 98 #endif 99
