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  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.
  45.   bool isIndirect()      const { return !IsRegister; }
  46.   bool isReg()           const { return IsRegister; }
  47.   unsigned getReg()      const { return Register; }
  48.   void setIsRegister(bool Is)  { IsRegister = Is; }
  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.