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+//===-- llvm/Target/TargetMachine.h - Target Information --------*- 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 defines the TargetMachine and LLVMTargetMachine classes.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_TARGETMACHINE_H
+#define LLVM_TARGET_TARGETMACHINE_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Triple.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CodeGen.h"
+#include "llvm/Target/TargetOptions.h"
+#include <string>
+
+namespace llvm {
+
+class Function;
+class GlobalValue;
+class MachineModuleInfo;
+class Mangler;
+class MCAsmInfo;
+class MCContext;
+class MCInstrInfo;
+class MCRegisterInfo;
+class MCSubtargetInfo;
+class MCSymbol;
+class raw_pwrite_stream;
+class PassManagerBuilder;
+class Target;
+class TargetIntrinsicInfo;
+class TargetIRAnalysis;
+class TargetTransformInfo;
+class TargetLoweringObjectFile;
+class TargetPassConfig;
+class TargetSubtargetInfo;
+
+// The old pass manager infrastructure is hidden in a legacy namespace now.
+namespace legacy {
+class PassManagerBase;
+}
+using legacy::PassManagerBase;
+
+//===----------------------------------------------------------------------===//
+///
+/// Primary interface to the complete machine description for the target
+/// machine.  All target-specific information should be accessible through this
+/// interface.
+///
+class TargetMachine {
+protected: // Can only create subclasses.
+  TargetMachine(const Target &T, StringRef DataLayoutString,
+                const Triple &TargetTriple, StringRef CPU, StringRef FS,
+                const TargetOptions &Options);
+
+  /// The Target that this machine was created for.
+  const Target &TheTarget;
+
+  /// DataLayout for the target: keep ABI type size and alignment.
+  ///
+  /// The DataLayout is created based on the string representation provided
+  /// during construction. It is kept here only to avoid reparsing the string
+  /// but should not really be used during compilation, because it has an
+  /// internal cache that is context specific.
+  const DataLayout DL;
+
+  /// Triple string, CPU name, and target feature strings the TargetMachine
+  /// instance is created with.
+  Triple TargetTriple;
+  std::string TargetCPU;
+  std::string TargetFS;
+
+  Reloc::Model RM = Reloc::Static;
+  CodeModel::Model CMModel = CodeModel::Small;
+  CodeGenOpt::Level OptLevel = CodeGenOpt::Default;
+
+  /// Contains target specific asm information.
+  std::unique_ptr<const MCAsmInfo> AsmInfo;
+  std::unique_ptr<const MCRegisterInfo> MRI;
+  std::unique_ptr<const MCInstrInfo> MII;
+  std::unique_ptr<const MCSubtargetInfo> STI;
+
+  unsigned RequireStructuredCFG : 1;
+  unsigned O0WantsFastISel : 1;
+
+public:
+  const TargetOptions DefaultOptions;
+  mutable TargetOptions Options;
+
+  TargetMachine(const TargetMachine &) = delete;
+  void operator=(const TargetMachine &) = delete;
+  virtual ~TargetMachine();
+
+  const Target &getTarget() const { return TheTarget; }
+
+  const Triple &getTargetTriple() const { return TargetTriple; }
+  StringRef getTargetCPU() const { return TargetCPU; }
+  StringRef getTargetFeatureString() const { return TargetFS; }
+
+  /// Virtual method implemented by subclasses that returns a reference to that
+  /// target's TargetSubtargetInfo-derived member variable.
+  virtual const TargetSubtargetInfo *getSubtargetImpl(const Function &) const {
+    return nullptr;
+  }
+  virtual TargetLoweringObjectFile *getObjFileLowering() const {
+    return nullptr;
+  }
+
+  /// This method returns a pointer to the specified type of
+  /// TargetSubtargetInfo.  In debug builds, it verifies that the object being
+  /// returned is of the correct type.
+  template <typename STC> const STC &getSubtarget(const Function &F) const {
+    return *static_cast<const STC*>(getSubtargetImpl(F));
+  }
+
+  /// Create a DataLayout.
+  const DataLayout createDataLayout() const { return DL; }
+
+  /// Test if a DataLayout if compatible with the CodeGen for this target.
+  ///
+  /// The LLVM Module owns a DataLayout that is used for the target independent
+  /// optimizations and code generation. This hook provides a target specific
+  /// check on the validity of this DataLayout.
+  bool isCompatibleDataLayout(const DataLayout &Candidate) const {
+    return DL == Candidate;
+  }
+
+  /// Get the pointer size for this target.
+  ///
+  /// This is the only time the DataLayout in the TargetMachine is used.
+  unsigned getPointerSize(unsigned AS) const {
+    return DL.getPointerSize(AS);
+  }
+
+  unsigned getPointerSizeInBits(unsigned AS) const {
+    return DL.getPointerSizeInBits(AS);
+  }
+
+  unsigned getProgramPointerSize() const {
+    return DL.getPointerSize(DL.getProgramAddressSpace());
+  }
+
+  unsigned getAllocaPointerSize() const {
+    return DL.getPointerSize(DL.getAllocaAddrSpace());
+  }
+
+  /// Reset the target options based on the function's attributes.
+  // FIXME: Remove TargetOptions that affect per-function code generation
+  // from TargetMachine.
+  void resetTargetOptions(const Function &F) const;
+
+  /// Return target specific asm information.
+  const MCAsmInfo *getMCAsmInfo() const { return AsmInfo.get(); }
+
+  const MCRegisterInfo *getMCRegisterInfo() const { return MRI.get(); }
+  const MCInstrInfo *getMCInstrInfo() const { return MII.get(); }
+  const MCSubtargetInfo *getMCSubtargetInfo() const { return STI.get(); }
+
+  /// If intrinsic information is available, return it.  If not, return null.
+  virtual const TargetIntrinsicInfo *getIntrinsicInfo() const {
+    return nullptr;
+  }
+
+  bool requiresStructuredCFG() const { return RequireStructuredCFG; }
+  void setRequiresStructuredCFG(bool Value) { RequireStructuredCFG = Value; }
+
+  /// Returns the code generation relocation model. The choices are static, PIC,
+  /// and dynamic-no-pic, and target default.
+  Reloc::Model getRelocationModel() const;
+
+  /// Returns the code model. The choices are small, kernel, medium, large, and
+  /// target default.
+  CodeModel::Model getCodeModel() const;
+
+  bool isPositionIndependent() const;
+
+  bool shouldAssumeDSOLocal(const Module &M, const GlobalValue *GV) const;
+
+  /// Returns true if this target uses emulated TLS.
+  bool useEmulatedTLS() const;
+
+  /// Returns the TLS model which should be used for the given global variable.
+  TLSModel::Model getTLSModel(const GlobalValue *GV) const;
+
+  /// Returns the optimization level: None, Less, Default, or Aggressive.
+  CodeGenOpt::Level getOptLevel() const;
+
+  /// Overrides the optimization level.
+  void setOptLevel(CodeGenOpt::Level Level);
+
+  void setFastISel(bool Enable) { Options.EnableFastISel = Enable; }
+  bool getO0WantsFastISel() { return O0WantsFastISel; }
+  void setO0WantsFastISel(bool Enable) { O0WantsFastISel = Enable; }
+  void setGlobalISel(bool Enable) { Options.EnableGlobalISel = Enable; }
+  void setGlobalISelAbort(GlobalISelAbortMode Mode) {
+    Options.GlobalISelAbort = Mode;
+  }
+  void setMachineOutliner(bool Enable) {
+    Options.EnableMachineOutliner = Enable;
+  }
+  void setSupportsDefaultOutlining(bool Enable) {
+    Options.SupportsDefaultOutlining = Enable;
+  }
+
+  bool shouldPrintMachineCode() const { return Options.PrintMachineCode; }
+
+  bool getUniqueSectionNames() const { return Options.UniqueSectionNames; }
+
+  /// Return true if data objects should be emitted into their own section,
+  /// corresponds to -fdata-sections.
+  bool getDataSections() const {
+    return Options.DataSections;
+  }
+
+  /// Return true if functions should be emitted into their own section,
+  /// corresponding to -ffunction-sections.
+  bool getFunctionSections() const {
+    return Options.FunctionSections;
+  }
+
+  /// Get a \c TargetIRAnalysis appropriate for the target.
+  ///
+  /// This is used to construct the new pass manager's target IR analysis pass,
+  /// set up appropriately for this target machine. Even the old pass manager
+  /// uses this to answer queries about the IR.
+  TargetIRAnalysis getTargetIRAnalysis();
+
+  /// Return a TargetTransformInfo for a given function.
+  ///
+  /// The returned TargetTransformInfo is specialized to the subtarget
+  /// corresponding to \p F.
+  virtual TargetTransformInfo getTargetTransformInfo(const Function &F);
+
+  /// Allow the target to modify the pass manager, e.g. by calling
+  /// PassManagerBuilder::addExtension.
+  virtual void adjustPassManager(PassManagerBuilder &) {}
+
+  /// These enums are meant to be passed into addPassesToEmitFile to indicate
+  /// what type of file to emit, and returned by it to indicate what type of
+  /// file could actually be made.
+  enum CodeGenFileType {
+    CGFT_AssemblyFile,
+    CGFT_ObjectFile,
+    CGFT_Null         // Do not emit any output.
+  };
+
+  /// Add passes to the specified pass manager to get the specified file
+  /// emitted.  Typically this will involve several steps of code generation.
+  /// This method should return true if emission of this file type is not
+  /// supported, or false on success.
+  /// \p MMI is an optional parameter that, if set to non-nullptr,
+  /// will be used to set the MachineModuloInfo for this PM.
+  virtual bool addPassesToEmitFile(PassManagerBase &, raw_pwrite_stream &,
+                                   raw_pwrite_stream *, CodeGenFileType,
+                                   bool /*DisableVerify*/ = true,
+                                   MachineModuleInfo *MMI = nullptr) {
+    return true;
+  }
+
+  /// Add passes to the specified pass manager to get machine code emitted with
+  /// the MCJIT. This method returns true if machine code is not supported. It
+  /// fills the MCContext Ctx pointer which can be used to build custom
+  /// MCStreamer.
+  ///
+  virtual bool addPassesToEmitMC(PassManagerBase &, MCContext *&,
+                                 raw_pwrite_stream &,
+                                 bool /*DisableVerify*/ = true) {
+    return true;
+  }
+
+  /// True if subtarget inserts the final scheduling pass on its own.
+  ///
+  /// Branch relaxation, which must happen after block placement, can
+  /// on some targets (e.g. SystemZ) expose additional post-RA
+  /// scheduling opportunities.
+  virtual bool targetSchedulesPostRAScheduling() const { return false; };
+
+  void getNameWithPrefix(SmallVectorImpl<char> &Name, const GlobalValue *GV,
+                         Mangler &Mang, bool MayAlwaysUsePrivate = false) const;
+  MCSymbol *getSymbol(const GlobalValue *GV) const;
+};
+
+/// This class describes a target machine that is implemented with the LLVM
+/// target-independent code generator.
+///
+class LLVMTargetMachine : public TargetMachine {
+protected: // Can only create subclasses.
+  LLVMTargetMachine(const Target &T, StringRef DataLayoutString,
+                    const Triple &TT, StringRef CPU, StringRef FS,
+                    const TargetOptions &Options, Reloc::Model RM,
+                    CodeModel::Model CM, CodeGenOpt::Level OL);
+
+  void initAsmInfo();
+
+public:
+  /// Get a TargetTransformInfo implementation for the target.
+  ///
+  /// The TTI returned uses the common code generator to answer queries about
+  /// the IR.
+  TargetTransformInfo getTargetTransformInfo(const Function &F) override;
+
+  /// Create a pass configuration object to be used by addPassToEmitX methods
+  /// for generating a pipeline of CodeGen passes.
+  virtual TargetPassConfig *createPassConfig(PassManagerBase &PM);
+
+  /// Add passes to the specified pass manager to get the specified file
+  /// emitted.  Typically this will involve several steps of code generation.
+  /// \p MMI is an optional parameter that, if set to non-nullptr,
+  /// will be used to set the MachineModuloInfofor this PM.
+  bool addPassesToEmitFile(PassManagerBase &PM, raw_pwrite_stream &Out,
+                           raw_pwrite_stream *DwoOut, CodeGenFileType FileType,
+                           bool DisableVerify = true,
+                           MachineModuleInfo *MMI = nullptr) override;
+
+  /// Add passes to the specified pass manager to get machine code emitted with
+  /// the MCJIT. This method returns true if machine code is not supported. It
+  /// fills the MCContext Ctx pointer which can be used to build custom
+  /// MCStreamer.
+  bool addPassesToEmitMC(PassManagerBase &PM, MCContext *&Ctx,
+                         raw_pwrite_stream &Out,
+                         bool DisableVerify = true) override;
+
+  /// Returns true if the target is expected to pass all machine verifier
+  /// checks. This is a stopgap measure to fix targets one by one. We will
+  /// remove this at some point and always enable the verifier when
+  /// EXPENSIVE_CHECKS is enabled.
+  virtual bool isMachineVerifierClean() const { return true; }
+
+  /// Adds an AsmPrinter pass to the pipeline that prints assembly or
+  /// machine code from the MI representation.
+  bool addAsmPrinter(PassManagerBase &PM, raw_pwrite_stream &Out,
+                     raw_pwrite_stream *DwoOut, CodeGenFileType FileTYpe,
+                     MCContext &Context);
+
+  /// True if the target uses physical regs at Prolog/Epilog insertion
+  /// time. If true (most machines), all vregs must be allocated before
+  /// PEI. If false (virtual-register machines), then callee-save register
+  /// spilling and scavenging are not needed or used.
+  virtual bool usesPhysRegsForPEI() const { return true; }
+
+  /// True if the target wants to use interprocedural register allocation by
+  /// default. The -enable-ipra flag can be used to override this.
+  virtual bool useIPRA() const {
+    return false;
+  }
+};
+
+/// Helper method for getting the code model, returning Default if
+/// CM does not have a value. The tiny and kernel models will produce
+/// an error, so targets that support them or require more complex codemodel
+/// selection logic should implement and call their own getEffectiveCodeModel.
+inline CodeModel::Model getEffectiveCodeModel(Optional<CodeModel::Model> CM,
+                                              CodeModel::Model Default) {
+  if (CM) {
+    // By default, targets do not support the tiny and kernel models.
+    if (*CM == CodeModel::Tiny)
+      report_fatal_error("Target does not support the tiny CodeModel");
+    if (*CM == CodeModel::Kernel)
+      report_fatal_error("Target does not support the kernel CodeModel");
+    return *CM;
+  }
+  return Default;
+}
+
+} // end namespace llvm
+
+#endif // LLVM_TARGET_TARGETMACHINE_H