lib/Target/Mips/MipsRegisterInfo.h

   1 //===- MipsRegisterInfo.h - Mips Register Information Impl ------*- 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 //
  10 // This file contains the Mips implementation of the TargetRegisterInfo class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_MIPS_MIPSREGISTERINFO_H
  15 #define LLVM_LIB_TARGET_MIPS_MIPSREGISTERINFO_H
  16
  17 #include "Mips.h"
  18 #include "llvm/CodeGen/MachineBasicBlock.h"
  19 #include <cstdint>
  20
  21 #define GET_REGINFO_HEADER
  22 #include "MipsGenRegisterInfo.inc"
  23
  24 namespace llvm {
  25
  26 class TargetRegisterClass;
  27
  28 class MipsRegisterInfo : public MipsGenRegisterInfo {
  29 public:
  30   enum class MipsPtrClass {
  31     /// The default register class for integer values.
  32     Default = 0,
  33     /// The subset of registers permitted in certain microMIPS instructions
  34     /// such as lw16.
  35     GPR16MM = 1,
  36     /// The stack pointer only.
  37     StackPointer = 2,
  38     /// The global pointer only.
  39     GlobalPointer = 3,
  40   };
  41
  42   MipsRegisterInfo();
  43
  44   /// Get PIC indirect call register
  45   static unsigned getPICCallReg();
  46
  47   /// Code Generation virtual methods...
  48   const TargetRegisterClass *getPointerRegClass(const MachineFunction &MF,
  49                                                 unsigned Kind) const override;
  50
  51   unsigned getRegPressureLimit(const TargetRegisterClass *RC,
  52                                MachineFunction &MF) const override;
  53   const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;
  54   const uint32_t *getCallPreservedMask(const MachineFunction &MF,
  55                                        CallingConv::ID) const override;
  56   static const uint32_t *getMips16RetHelperMask();
  57
  58   BitVector getReservedRegs(const MachineFunction &MF) const override;
  59
  60   bool requiresRegisterScavenging(const MachineFunction &MF) const override;
  61
  62   bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;
  63
  64   /// Stack Frame Processing Methods
  65   void eliminateFrameIndex(MachineBasicBlock::iterator II,
  66                            int SPAdj, unsigned FIOperandNum,
  67                            RegScavenger *RS = nullptr) const override;
  68
  69   // Stack realignment queries.
  70   bool canRealignStack(const MachineFunction &MF) const override;
  71
  72   /// Debug information queries.
  73   unsigned getFrameRegister(const MachineFunction &MF) const override;
  74
  75   /// Return GPR register class.
  76   virtual const TargetRegisterClass *intRegClass(unsigned Size) const = 0;
  77
  78 private:
  79   virtual void eliminateFI(MachineBasicBlock::iterator II, unsigned OpNo,
  80                            int FrameIndex, uint64_t StackSize,
  81                            int64_t SPOffset) const = 0;
  82 };
  83
  84 } // end namespace llvm
  85
  86 #endif // LLVM_LIB_TARGET_MIPS_MIPSREGISTERINFO_H