llvm/lib/Target/M68k/M68kSubtarget.h

   1 //===-- M68kSubtarget.h - Define Subtarget for the M68k -----*- 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 /// \file
  10 /// This file declares the M68k specific subclass of TargetSubtargetInfo.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_CPU0_M68KSUBTARGET_H
  15 #define LLVM_LIB_TARGET_CPU0_M68KSUBTARGET_H
  16
  17 #include "M68kFrameLowering.h"
  18 #include "M68kISelLowering.h"
  19 #include "M68kInstrInfo.h"
  20
  21 #include "llvm/ADT/BitVector.h"
  22 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
  23 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
  24 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
  25 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
  26 #include "llvm/CodeGen/SelectionDAGTargetInfo.h"
  27 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  28 #include "llvm/IR/DataLayout.h"
  29 #include "llvm/MC/MCInstrItineraries.h"
  30 #include "llvm/Support/Alignment.h"
  31
  32 #include <string>
  33
  34 #define GET_SUBTARGETINFO_HEADER
  35 #include "M68kGenSubtargetInfo.inc"
  36
  37 extern bool M68kReserveGP;
  38 extern bool M68kNoCpload;
  39
  40 namespace llvm {
  41 class StringRef;
  42
  43 class M68kTargetMachine;
  44
  45 class M68kSubtarget : public M68kGenSubtargetInfo {
  46   virtual void anchor();
  47
  48 protected:
  49   // These define which ISA is supported. Since each Motorola M68k ISA is
  50   // built on top of the previous one whenever an ISA is selected the previous
  51   // selected as well.
  52   enum SubtargetEnum { M00, M10, M20, M30, M40, M60 };
  53   SubtargetEnum SubtargetKind = M00;
  54
  55   BitVector UserReservedRegister;
  56
  57   InstrItineraryData InstrItins;
  58
  59   /// Small section is used.
  60   bool UseSmallSection = true;
  61
  62   const M68kTargetMachine &TM;
  63
  64   SelectionDAGTargetInfo TSInfo;
  65   M68kInstrInfo InstrInfo;
  66   M68kFrameLowering FrameLowering;
  67   M68kTargetLowering TLInfo;
  68
  69   /// The minimum alignment known to hold of the stack frame on
  70   /// entry to the function and which must be maintained by every function.
  71   unsigned stackAlignment = 8;
  72
  73   Triple TargetTriple;
  74
  75 public:
  76   /// This constructor initializes the data members to match that
  77   /// of the specified triple.
  78   M68kSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
  79                 const M68kTargetMachine &_TM);
  80
  81   /// Parses features string setting specified subtarget options.  Definition
  82   /// of function is auto generated by tblgen.
  83   void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
  84
  85   bool atLeastM68000() const { return SubtargetKind >= M00; }
  86   bool atLeastM68010() const { return SubtargetKind >= M10; }
  87   bool atLeastM68020() const { return SubtargetKind >= M20; }
  88   bool atLeastM68030() const { return SubtargetKind >= M30; }
  89   bool atLeastM68040() const { return SubtargetKind >= M40; }
  90   bool atLeastM68060() const { return SubtargetKind >= M60; }
  91
  92   bool useSmallSection() const { return UseSmallSection; }
  93
  94   bool abiUsesSoftFloat() const;
  95
  96   const Triple &getTargetTriple() const { return TargetTriple; }
  97
  98   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
  99
 100   /// Return true if the subtarget allows calls to immediate address.
 101   bool isLegalToCallImmediateAddr() const;
 102
 103   bool isPositionIndependent() const;
 104
 105   bool isRegisterReservedByUser(Register R) const {
 106     assert(R < M68k::NUM_TARGET_REGS && "Register out of range");
 107     return UserReservedRegister[R];
 108   }
 109
 110   /// Classify a global variable reference for the current subtarget according
 111   /// to how we should reference it in a non-pcrel context.
 112   unsigned char classifyLocalReference(const GlobalValue *GV) const;
 113
 114   /// Classify a global variable reference for the current subtarget according
 115   /// to how we should reference it in a non-pcrel context.
 116   unsigned char classifyGlobalReference(const GlobalValue *GV,
 117                                         const Module &M) const;
 118   unsigned char classifyGlobalReference(const GlobalValue *GV) const;
 119
 120   /// Classify a external variable reference for the current subtarget according
 121   /// to how we should reference it in a non-pcrel context.
 122   unsigned char classifyExternalReference(const Module &M) const;
 123
 124   /// Classify a global function reference for the current subtarget.
 125   unsigned char classifyGlobalFunctionReference(const GlobalValue *GV,
 126                                                 const Module &M) const;
 127   unsigned char classifyGlobalFunctionReference(const GlobalValue *GV) const;
 128
 129   /// Classify a blockaddress reference for the current subtarget according to
 130   /// how we should reference it in a non-pcrel context.
 131   unsigned char classifyBlockAddressReference() const;
 132
 133   unsigned getJumpTableEncoding() const;
 134
 135   /// TODO this must be controlled by options like -malign-int and -mshort
 136   Align getStackAlignment() const { return Align(stackAlignment); }
 137
 138   /// getSlotSize - Stack slot size in bytes.
 139   unsigned getSlotSize() const { return 4; }
 140
 141   M68kSubtarget &initializeSubtargetDependencies(StringRef CPU, Triple TT,
 142                                                  StringRef FS,
 143                                                  const M68kTargetMachine &TM);
 144
 145   const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
 146     return &TSInfo;
 147   }
 148
 149   const M68kInstrInfo *getInstrInfo() const override { return &InstrInfo; }
 150
 151   const M68kFrameLowering *getFrameLowering() const override {
 152     return &FrameLowering;
 153   }
 154
 155   const M68kRegisterInfo *getRegisterInfo() const override {
 156     return &InstrInfo.getRegisterInfo();
 157   }
 158
 159   const M68kTargetLowering *getTargetLowering() const override {
 160     return &TLInfo;
 161   }
 162
 163   const InstrItineraryData *getInstrItineraryData() const override {
 164     return &InstrItins;
 165   }
 166
 167 protected:
 168   // GlobalISel related APIs.
 169   std::unique_ptr<CallLowering> CallLoweringInfo;
 170   std::unique_ptr<InstructionSelector> InstSelector;
 171   std::unique_ptr<LegalizerInfo> Legalizer;
 172   std::unique_ptr<RegisterBankInfo> RegBankInfo;
 173
 174 public:
 175   const CallLowering *getCallLowering() const override;
 176   InstructionSelector *getInstructionSelector() const override;
 177   const LegalizerInfo *getLegalizerInfo() const override;
 178   const RegisterBankInfo *getRegBankInfo() const override;
 179 };
 180 } // namespace llvm
 181
 182 #endif