MachineLocation.h revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
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
22namespace llvm {
23  class MCSymbol;
24
25class MachineLocation {
26private:
27  bool IsRegister;                      // True if location is a register.
28  unsigned Register;                    // gcc/gdb register number.
29  int Offset;                           // Displacement if not register.
30public:
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
77inline bool operator!=(const MachineLocation &LHS, const MachineLocation &RHS) {
78  return !(LHS == RHS);
79}
80
81} // End llvm namespace
82
83#endif
84