MachineLocation.h revision 4a971705bc6030dc2e4338b3cd5cffa2e0f88b7b 
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
19namespace llvm {
20  class MCSymbol;
21
22class MachineLocation {
23private:
24  bool IsRegister;                      // True if location is a register.
25  unsigned Register;                    // gcc/gdb register number.
26  int Offset;                           // Displacement if not register.
27public:
28  enum {
29    // The target register number for an abstract frame pointer. The value is
30    // an arbitrary value that doesn't collide with any real target register.
31    VirtualFP = ~0U
32  };
33  MachineLocation()
34    : IsRegister(false), Register(0), Offset(0) {}
35  /// Create a direct register location.
36  explicit MachineLocation(unsigned R)
37    : IsRegister(true), Register(R), Offset(0) {}
38  /// Create a register-indirect location with an offset.
39  MachineLocation(unsigned R, int O)
40    : IsRegister(false), Register(R), Offset(O) {}
41
42  bool operator==(const MachineLocation &Other) const {
43      return IsRegister == Other.IsRegister && Register == Other.Register &&
44        Offset == Other.Offset;
45  }
46
47  // Accessors
48  bool isIndirect()      const { return !IsRegister; }
49  bool isReg()           const { return IsRegister; }
50  unsigned getReg()      const { return Register; }
51  int getOffset()        const { return Offset; }
52  void setIsRegister(bool Is)  { IsRegister = Is; }
53  void setRegister(unsigned R) { Register = R; }
54  void setOffset(int O)        { Offset = O; }
55  /// Make this location a direct register location.
56  void set(unsigned R) {
57    IsRegister = true;
58    Register = R;
59    Offset = 0;
60  }
61  /// Make this location a register-indirect+offset location.
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} // End llvm namespace
73
74#endif
75