llvm/lib/Target/AArch64/AArch64TargetMachine.h

//==-- AArch64TargetMachine.h - Define TargetMachine for AArch64 -*- C++ -*-==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares the AArch64 specific subclass of TargetMachine.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64TARGETMACHINE_H
#define LLVM_LIB_TARGET_AARCH64_AARCH64TARGETMACHINE_H

#include "AArch64InstrInfo.h"
#include "AArch64Subtarget.h"
#include "llvm/CodeGen/CodeGenTargetMachineImpl.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/DataLayout.h"
#include <optional>

namespace llvm {

class AArch64TargetMachine : public CodeGenTargetMachineImpl {
  const AArch64Options &CLOpts;

protected:
  std::unique_ptr<TargetLoweringObjectFile> TLOF;
  mutable StringMap<std::unique_ptr<AArch64Subtarget>> SubtargetMap;
  mutable AttributeSet LastSubtargetAttrs;
  mutable const AArch64Subtarget *LastSubtarget = nullptr;

  /// Reset internal state.
  void reset() override;

public:
  AArch64TargetMachine(const Target &T, const Triple &TT, StringRef CPU,
                       StringRef FS, const TargetOptions &Options,
                       std::optional<Reloc::Model> RM,
                       std::optional<CodeModel::Model> CM, CodeGenOptLevel OL,
                       bool JIT, bool IsLittleEndian);

  ~AArch64TargetMachine() override;

  const AArch64Options &getCLOpts() const { return CLOpts; }
  const AArch64Subtarget *getSubtargetImpl(const Function &F) const override;
  // DO NOT IMPLEMENT: There is no such thing as a valid default subtarget,
  // subtargets are per-function entities based on the target-specific
  // attributes of each function.
  const AArch64Subtarget *getSubtargetImpl() const = delete;

  // Pass Pipeline Configuration
  TargetPassConfig *createPassConfig(PassManagerBase &PM) override;

  void registerPassBuilderCallbacks(PassBuilder &PB) override;

  TargetTransformInfo getTargetTransformInfo(const Function &F) const override;

  TargetLoweringObjectFile* getObjFileLowering() const override {
    return TLOF.get();
  }

  MachineFunctionInfo *
  createMachineFunctionInfo(BumpPtrAllocator &Allocator, const Function &F,
                            const TargetSubtargetInfo *STI) const override;

  yaml::MachineFunctionInfo *createDefaultFuncInfoYAML() const override;
  yaml::MachineFunctionInfo *
  convertFuncInfoToYAML(const MachineFunction &MF) const override;
  bool parseMachineFunctionInfo(const yaml::MachineFunctionInfo &,
                                PerFunctionMIParsingState &PFS,
                                SMDiagnostic &Error,
                                SMRange &SourceRange) const override;

  /// Returns true if a cast between SrcAS and DestAS is a noop.
  bool isNoopAddrSpaceCast(const DataLayout &DL, unsigned SrcAS,
                           unsigned DestAS) const override {
    return DL.getPointerSize(SrcAS) == DL.getPointerSize(DestAS);
  }
  ScheduleDAGInstrs *
  createMachineScheduler(MachineSchedContext *C) const override;

  ScheduleDAGInstrs *
  createPostMachineScheduler(MachineSchedContext *C) const override;

  size_t clearLinkerOptimizationHints(
      const SmallPtrSetImpl<MachineInstr *> &MIs) const override;

  /// Returns the optimisation level that enables GlobalISel.
  unsigned getEnableGlobalISelAtO() const;

  /// This function checks whether the opt level is explicitly set to none,
  /// or whether GlobalISel was enabled due to SDAG encountering an optnone
  /// function. If the opt level is greater than the level we automatically
  /// enable globalisel at, and it wasn't enabled via CLI, we know that it must
  /// be because of an optnone function.
  bool isGlobalISelOptNone() const;

private:
  bool isLittle;
};

// AArch64 little endian target machine.
//
class AArch64leTargetMachine : public AArch64TargetMachine {
  virtual void anchor();

public:
  AArch64leTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
                         StringRef FS, const TargetOptions &Options,
                         std::optional<Reloc::Model> RM,
                         std::optional<CodeModel::Model> CM, CodeGenOptLevel OL,
                         bool JIT);
};

// AArch64 big endian target machine.
//
class AArch64beTargetMachine : public AArch64TargetMachine {
  virtual void anchor();

public:
  AArch64beTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
                         StringRef FS, const TargetOptions &Options,
                         std::optional<Reloc::Model> RM,
                         std::optional<CodeModel::Model> CM, CodeGenOptLevel OL,
                         bool JIT);
};

} // end namespace llvm

#endif