1 //===- llvm/MC/MachineLocation.h --------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 // The MachineLocation class is used to represent a simple location in a machine
9 // frame.  Locations will be one of two forms; a register or an address formed
10 // from a base address plus an offset.  Register indirection can be specified by
11 // explicitly passing an offset to the constructor.
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_MC_MACHINELOCATION_H
15 #define LLVM_MC_MACHINELOCATION_H
16 
17 #include <cstdint>
18 #include <cassert>
19 
20 namespace llvm {
21 
22 class MachineLocation {
23 private:
24   bool IsRegister = false;              ///< True if location is a register.
25   unsigned Register = 0;                ///< gcc/gdb register number.
26 
27 public:
28   enum : uint32_t {
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 
34   MachineLocation() = default;
35   /// Create a direct register location.
36   explicit MachineLocation(unsigned R, bool Indirect = false)
37       : IsRegister(!Indirect), Register(R) {}
38 
39   bool operator==(const MachineLocation &Other) const {
40     return IsRegister == Other.IsRegister && Register == Other.Register;
41   }
42 
43   // Accessors.
44   /// \return true iff this is a register-indirect location.
isIndirect()45   bool isIndirect()      const { return !IsRegister; }
isReg()46   bool isReg()           const { return IsRegister; }
getReg()47   unsigned getReg()      const { return Register; }
setIsRegister(bool Is)48   void setIsRegister(bool Is)  { IsRegister = Is; }
setRegister(unsigned R)49   void setRegister(unsigned R) { Register = R; }
50 };
51 
52 inline bool operator!=(const MachineLocation &LHS, const MachineLocation &RHS) {
53   return !(LHS == RHS);
54 }
55 
56 } // end namespace llvm
57 
58 #endif // LLVM_MC_MACHINELOCATION_H
59