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