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 //===- MCStreamer.h - High-level Streaming Machine Code Output --*- 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 MCStreamer class.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_MC_MCSTREAMER_H
 #define LLVM_MC_MCSTREAMER_H
 
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/MC/MCDirectives.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/MC/MCFragment.h"
 #include "llvm/MC/MCLinkerOptimizationHint.h"
 #include "llvm/MC/MCPseudoProbe.h"
 #include "llvm/MC/MCWinEH.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/MD5.h"
 #include "llvm/Support/SMLoc.h"
 #include "llvm/Support/VersionTuple.h"
 #include "llvm/TargetParser/ARMTargetParser.h"
 #include <cassert>
 #include <cstdint>
 #include <memory>
 #include <optional>
 #include <string>
 #include <utility>
 #include <vector>
 
 namespace llvm {
 
 class APInt;
 class AssemblerConstantPools;
 class MCAsmBackend;
 class MCAssembler;
 class MCContext;
 class MCExpr;
 class MCFragment;
 class MCInst;
 class MCInstPrinter;
 class MCRegister;
 class MCSection;
 class MCStreamer;
 class MCSubtargetInfo;
 class MCSymbol;
 class MCSymbolRefExpr;
 class Triple;
 class Twine;
 class raw_ostream;
 
 namespace codeview {
 struct DefRangeRegisterRelHeader;
 struct DefRangeSubfieldRegisterHeader;
 struct DefRangeRegisterHeader;
 struct DefRangeFramePointerRelHeader;
 }
 
 using MCSectionSubPair = std::pair<MCSection *, uint32_t>;
 
 /// Target specific streamer interface. This is used so that targets can
 /// implement support for target specific assembly directives.
 ///
 /// If target foo wants to use this, it should implement 3 classes:
 /// * FooTargetStreamer : public MCTargetStreamer
 /// * FooTargetAsmStreamer : public FooTargetStreamer
 /// * FooTargetELFStreamer : public FooTargetStreamer
 ///
 /// FooTargetStreamer should have a pure virtual method for each directive. For
 /// example, for a ".bar symbol_name" directive, it should have
 /// virtual emitBar(const MCSymbol &Symbol) = 0;
 ///
 /// The FooTargetAsmStreamer and FooTargetELFStreamer classes implement the
 /// method. The assembly streamer just prints ".bar symbol_name". The object
 /// streamer does whatever is needed to implement .bar in the object file.
 ///
 /// In the assembly printer and parser the target streamer can be used by
 /// calling getTargetStreamer and casting it to FooTargetStreamer:
 ///
 /// MCTargetStreamer &TS = OutStreamer.getTargetStreamer();
 /// FooTargetStreamer &ATS = static_cast<FooTargetStreamer &>(TS);
 ///
 /// The base classes FooTargetAsmStreamer and FooTargetELFStreamer should
 /// *never* be treated differently. Callers should always talk to a
 /// FooTargetStreamer.
 class MCTargetStreamer {
 protected:
   MCStreamer &Streamer;
 
 public:
   MCTargetStreamer(MCStreamer &S);
   virtual ~MCTargetStreamer();
 
   MCStreamer &getStreamer() { return Streamer; }
 
   // Allow a target to add behavior to the EmitLabel of MCStreamer.
   virtual void emitLabel(MCSymbol *Symbol);
   // Allow a target to add behavior to the emitAssignment of MCStreamer.
   virtual void emitAssignment(MCSymbol *Symbol, const MCExpr *Value);
 
   virtual void prettyPrintAsm(MCInstPrinter &InstPrinter, uint64_t Address,
                               const MCInst &Inst, const MCSubtargetInfo &STI,
                               raw_ostream &OS);
 
   virtual void emitDwarfFileDirective(StringRef Directive);
 
   /// Update streamer for a new active section.
   ///
   /// This is called by popSection and switchSection, if the current
   /// section changes.
   virtual void changeSection(const MCSection *CurSection, MCSection *Section,
                              uint32_t SubSection, raw_ostream &OS);
 
   virtual void emitValue(const MCExpr *Value);
 
   /// Emit the bytes in \p Data into the output.
   ///
   /// This is used to emit bytes in \p Data as sequence of .byte directives.
   virtual void emitRawBytes(StringRef Data);
 
   virtual void emitConstantPools();
 
   virtual void finish();
 };
 
 // FIXME: declared here because it is used from
 // lib/CodeGen/AsmPrinter/ARMException.cpp.
 class ARMTargetStreamer : public MCTargetStreamer {
 public:
   ARMTargetStreamer(MCStreamer &S);
   ~ARMTargetStreamer() override;
 
   virtual void emitFnStart();
   virtual void emitFnEnd();
   virtual void emitCantUnwind();
   virtual void emitPersonality(const MCSymbol *Personality);
   virtual void emitPersonalityIndex(unsigned Index);
   virtual void emitHandlerData();
   virtual void emitSetFP(MCRegister FpReg, MCRegister SpReg,
                          int64_t Offset = 0);
   virtual void emitMovSP(MCRegister Reg, int64_t Offset = 0);
   virtual void emitPad(int64_t Offset);
   virtual void emitRegSave(const SmallVectorImpl<MCRegister> &RegList,
                            bool isVector);
   virtual void emitUnwindRaw(int64_t StackOffset,
                              const SmallVectorImpl<uint8_t> &Opcodes);
 
   virtual void switchVendor(StringRef Vendor);
   virtual void emitAttribute(unsigned Attribute, unsigned Value);
   virtual void emitTextAttribute(unsigned Attribute, StringRef String);
   virtual void emitIntTextAttribute(unsigned Attribute, unsigned IntValue,
                                     StringRef StringValue = "");
   virtual void emitFPU(ARM::FPUKind FPU);
   virtual void emitArch(ARM::ArchKind Arch);
   virtual void emitArchExtension(uint64_t ArchExt);
   virtual void emitObjectArch(ARM::ArchKind Arch);
   void emitTargetAttributes(const MCSubtargetInfo &STI);
   virtual void finishAttributeSection();
   virtual void emitInst(uint32_t Inst, char Suffix = '\0');
 
   virtual void annotateTLSDescriptorSequence(const MCSymbolRefExpr *SRE);
 
   virtual void emitThumbSet(MCSymbol *Symbol, const MCExpr *Value);
 
   void emitConstantPools() override;
 
   virtual void emitARMWinCFIAllocStack(unsigned Size, bool Wide);
   virtual void emitARMWinCFISaveRegMask(unsigned Mask, bool Wide);
   virtual void emitARMWinCFISaveSP(unsigned Reg);
   virtual void emitARMWinCFISaveFRegs(unsigned First, unsigned Last);
   virtual void emitARMWinCFISaveLR(unsigned Offset);
   virtual void emitARMWinCFIPrologEnd(bool Fragment);
   virtual void emitARMWinCFINop(bool Wide);
   virtual void emitARMWinCFIEpilogStart(unsigned Condition);
   virtual void emitARMWinCFIEpilogEnd();
   virtual void emitARMWinCFICustom(unsigned Opcode);
 
   /// Reset any state between object emissions, i.e. the equivalent of
   /// MCStreamer's reset method.
   virtual void reset();
 
   /// Callback used to implement the ldr= pseudo.
   /// Add a new entry to the constant pool for the current section and return an
   /// MCExpr that can be used to refer to the constant pool location.
   const MCExpr *addConstantPoolEntry(const MCExpr *, SMLoc Loc);
 
   /// Callback used to implement the .ltorg directive.
   /// Emit contents of constant pool for the current section.
   void emitCurrentConstantPool();
 
 private:
   std::unique_ptr<AssemblerConstantPools> ConstantPools;
 };
 
 /// Streaming machine code generation interface.
 ///
 /// This interface is intended to provide a programmatic interface that is very
 /// similar to the level that an assembler .s file provides.  It has callbacks
 /// to emit bytes, handle directives, etc.  The implementation of this interface
 /// retains state to know what the current section is etc.
 ///
 /// There are multiple implementations of this interface: one for writing out
 /// a .s file, and implementations that write out .o files of various formats.
 ///
 class MCStreamer {
   MCContext &Context;
   std::unique_ptr<MCTargetStreamer> TargetStreamer;
 
   std::vector<MCDwarfFrameInfo> DwarfFrameInfos;
   // This is a pair of index into DwarfFrameInfos and the MCSection associated
   // with the frame. Note, we use an index instead of an iterator because they
   // can be invalidated in std::vector.
   SmallVector<std::pair<size_t, MCSection *>, 1> FrameInfoStack;
   MCDwarfFrameInfo *getCurrentDwarfFrameInfo();
 
   /// Similar to DwarfFrameInfos, but for SEH unwind info. Chained frames may
   /// refer to each other, so use std::unique_ptr to provide pointer stability.
   std::vector<std::unique_ptr<WinEH::FrameInfo>> WinFrameInfos;
 
   WinEH::FrameInfo *CurrentWinFrameInfo;
   size_t CurrentProcWinFrameInfoStartIndex;
 
   /// This is stack of current and previous section values saved by
   /// pushSection.
   SmallVector<std::pair<MCSectionSubPair, MCSectionSubPair>, 4> SectionStack;
 
   /// Pointer to the parser's SMLoc if available. This is used to provide
   /// locations for diagnostics.
   const SMLoc *StartTokLocPtr = nullptr;
 
   /// The next unique ID to use when creating a WinCFI-related section (.pdata
   /// or .xdata). This ID ensures that we have a one-to-one mapping from
   /// code section to unwind info section, which MSVC's incremental linker
   /// requires.
   unsigned NextWinCFIID = 0;
 
   bool UseAssemblerInfoForParsing = true;
 
   /// Is the assembler allowed to insert padding automatically?  For
   /// correctness reasons, we sometimes need to ensure instructions aren't
   /// separated in unexpected ways.  At the moment, this feature is only
   /// useable from an integrated assembler, but assembly syntax is under
   /// discussion for future inclusion.
   bool AllowAutoPadding = false;
 
 protected:
   MCFragment *CurFrag = nullptr;
 
   MCStreamer(MCContext &Ctx);
 
   /// This is called by popSection and switchSection, if the current
   /// section changes.
   virtual void changeSection(MCSection *, uint32_t);
 
   virtual void emitCFIStartProcImpl(MCDwarfFrameInfo &Frame);
   virtual void emitCFIEndProcImpl(MCDwarfFrameInfo &CurFrame);
 
   WinEH::FrameInfo *getCurrentWinFrameInfo() {
     return CurrentWinFrameInfo;
   }
 
   virtual void emitWindowsUnwindTables(WinEH::FrameInfo *Frame);
 
   virtual void emitWindowsUnwindTables();
 
   virtual void emitRawTextImpl(StringRef String);
 
   /// Returns true if the .cv_loc directive is in the right section.
   bool checkCVLocSection(unsigned FuncId, unsigned FileNo, SMLoc Loc);
 
 public:
   MCStreamer(const MCStreamer &) = delete;
   MCStreamer &operator=(const MCStreamer &) = delete;
   virtual ~MCStreamer();
 
   void visitUsedExpr(const MCExpr &Expr);
   virtual void visitUsedSymbol(const MCSymbol &Sym);
 
   void setTargetStreamer(MCTargetStreamer *TS) {
     TargetStreamer.reset(TS);
   }
 
   void setStartTokLocPtr(const SMLoc *Loc) { StartTokLocPtr = Loc; }
   SMLoc getStartTokLoc() const {
     return StartTokLocPtr ? *StartTokLocPtr : SMLoc();
   }
 
   /// State management
   ///
   virtual void reset();
 
   MCContext &getContext() const { return Context; }
 
   // MCObjectStreamer has an MCAssembler and allows more expression folding at
   // parse time.
   virtual MCAssembler *getAssemblerPtr() { return nullptr; }
 
   void setUseAssemblerInfoForParsing(bool v) { UseAssemblerInfoForParsing = v; }
   bool getUseAssemblerInfoForParsing() { return UseAssemblerInfoForParsing; }
 
   MCTargetStreamer *getTargetStreamer() {
     return TargetStreamer.get();
   }
 
   void setAllowAutoPadding(bool v) { AllowAutoPadding = v; }
   bool getAllowAutoPadding() const { return AllowAutoPadding; }
 
   MCSymbol *emitLineTableLabel();
 
   /// When emitting an object file, create and emit a real label. When emitting
   /// textual assembly, this should do nothing to avoid polluting our output.
   virtual MCSymbol *emitCFILabel();
 
   /// Retrieve the current frame info if one is available and it is not yet
   /// closed. Otherwise, issue an error and return null.
   WinEH::FrameInfo *EnsureValidWinFrameInfo(SMLoc Loc);
 
   unsigned getNumFrameInfos();
   ArrayRef<MCDwarfFrameInfo> getDwarfFrameInfos() const;
 
   bool hasUnfinishedDwarfFrameInfo();
 
   unsigned getNumWinFrameInfos() { return WinFrameInfos.size(); }
   ArrayRef<std::unique_ptr<WinEH::FrameInfo>> getWinFrameInfos() const {
     return WinFrameInfos;
   }
 
   void generateCompactUnwindEncodings(MCAsmBackend *MAB);
 
   /// \name Assembly File Formatting.
   /// @{
 
   /// Return true if this streamer supports verbose assembly and if it is
   /// enabled.
   virtual bool isVerboseAsm() const { return false; }
 
   /// Return true if this asm streamer supports emitting unformatted text
   /// to the .s file with EmitRawText.
   virtual bool hasRawTextSupport() const { return false; }
 
   /// Is the integrated assembler required for this streamer to function
   /// correctly?
   virtual bool isIntegratedAssemblerRequired() const { return false; }
 
   /// Add a textual comment.
   ///
   /// Typically for comments that can be emitted to the generated .s
   /// file if applicable as a QoI issue to make the output of the compiler
   /// more readable.  This only affects the MCAsmStreamer, and only when
   /// verbose assembly output is enabled.
   ///
   /// If the comment includes embedded \n's, they will each get the comment
   /// prefix as appropriate.  The added comment should not end with a \n.
   /// By default, each comment is terminated with an end of line, i.e. the
   /// EOL param is set to true by default. If one prefers not to end the
   /// comment with a new line then the EOL param should be passed
   /// with a false value.
   virtual void AddComment(const Twine &T, bool EOL = true) {}
 
   /// Return a raw_ostream that comments can be written to. Unlike
   /// AddComment, you are required to terminate comments with \n if you use this
   /// method.
   virtual raw_ostream &getCommentOS();
 
   /// Print T and prefix it with the comment string (normally #) and
   /// optionally a tab. This prints the comment immediately, not at the end of
   /// the current line. It is basically a safe version of EmitRawText: since it
   /// only prints comments, the object streamer ignores it instead of asserting.
   virtual void emitRawComment(const Twine &T, bool TabPrefix = true);
 
   /// Add explicit comment T. T is required to be a valid
   /// comment in the output and does not need to be escaped.
   virtual void addExplicitComment(const Twine &T);
 
   /// Emit added explicit comments.
   virtual void emitExplicitComments();
 
   /// Emit a blank line to a .s file to pretty it up.
   virtual void addBlankLine() {}
 
   /// @}
 
   /// \name Symbol & Section Management
   /// @{
 
   /// Return the current section that the streamer is emitting code to.
   MCSectionSubPair getCurrentSection() const {
     if (!SectionStack.empty())
       return SectionStack.back().first;
     return MCSectionSubPair();
   }
   MCSection *getCurrentSectionOnly() const {
     return CurFrag->getParent();
   }
 
   /// Return the previous section that the streamer is emitting code to.
   MCSectionSubPair getPreviousSection() const {
     if (!SectionStack.empty())
       return SectionStack.back().second;
     return MCSectionSubPair();
   }
 
   MCFragment *getCurrentFragment() const {
     assert(!getCurrentSection().first ||
            CurFrag->getParent() == getCurrentSection().first);
     return CurFrag;
   }
 
   /// Save the current and previous section on the section stack.
   void pushSection() {
     SectionStack.push_back(
         std::make_pair(getCurrentSection(), getPreviousSection()));
   }
 
   /// Restore the current and previous section from the section stack.
   /// Calls changeSection as needed.
   ///
   /// Returns false if the stack was empty.
   virtual bool popSection();
 
   /// Set the current section where code is being emitted to \p Section.  This
   /// is required to update CurSection.
   ///
   /// This corresponds to assembler directives like .section, .text, etc.
   virtual void switchSection(MCSection *Section, uint32_t Subsec = 0);
   bool switchSection(MCSection *Section, const MCExpr *);
 
   /// Similar to switchSection, but does not print the section directive.
   virtual void switchSectionNoPrint(MCSection *Section);
 
   /// Create the default sections and set the initial one.
   virtual void initSections(bool NoExecStack, const MCSubtargetInfo &STI);
 
   MCSymbol *endSection(MCSection *Section);
 
   /// Returns the mnemonic for \p MI, if the streamer has access to a
   /// instruction printer and returns an empty string otherwise.
   virtual StringRef getMnemonic(const MCInst &MI) const { return ""; }
 
   /// Emit a label for \p Symbol into the current section.
   ///
   /// This corresponds to an assembler statement such as:
   ///   foo:
   ///
   /// \param Symbol - The symbol to emit. A given symbol should only be
   /// emitted as a label once, and symbols emitted as a label should never be
   /// used in an assignment.
   // FIXME: These emission are non-const because we mutate the symbol to
   // add the section we're emitting it to later.
   virtual void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc());
 
   virtual void emitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol);
 
   /// Note in the output the specified \p Flag.
   virtual void emitAssemblerFlag(MCAssemblerFlag Flag);
 
   /// Emit the given list \p Options of strings as linker
   /// options into the output.
   virtual void emitLinkerOptions(ArrayRef<std::string> Kind) {}
 
   /// Note in the output the specified region \p Kind.
   virtual void emitDataRegion(MCDataRegionType Kind) {}
 
   /// Specify the Mach-O minimum deployment target version.
   virtual void emitVersionMin(MCVersionMinType Type, unsigned Major,
                               unsigned Minor, unsigned Update,
                               VersionTuple SDKVersion) {}
 
   /// Emit/Specify Mach-O build version command.
   /// \p Platform should be one of MachO::PlatformType.
   virtual void emitBuildVersion(unsigned Platform, unsigned Major,
                                 unsigned Minor, unsigned Update,
                                 VersionTuple SDKVersion) {}
 
   virtual void emitDarwinTargetVariantBuildVersion(unsigned Platform,
                                                    unsigned Major,
                                                    unsigned Minor,
                                                    unsigned Update,
                                                    VersionTuple SDKVersion) {}
 
   void emitVersionForTarget(const Triple &Target,
                             const VersionTuple &SDKVersion,
                             const Triple *DarwinTargetVariantTriple,
                             const VersionTuple &DarwinTargetVariantSDKVersion);
 
   /// Note in the output that the specified \p Func is a Thumb mode
   /// function (ARM target only).
   virtual void emitThumbFunc(MCSymbol *Func);
 
   /// Emit an assignment of \p Value to \p Symbol.
   ///
   /// This corresponds to an assembler statement such as:
   ///  symbol = value
   ///
   /// The assignment generates no code, but has the side effect of binding the
   /// value in the current context. For the assembly streamer, this prints the
   /// binding into the .s file.
   ///
   /// \param Symbol - The symbol being assigned to.
   /// \param Value - The value for the symbol.
   virtual void emitAssignment(MCSymbol *Symbol, const MCExpr *Value);
 
   /// Emit an assignment of \p Value to \p Symbol, but only if \p Value is also
   /// emitted.
   virtual void emitConditionalAssignment(MCSymbol *Symbol, const MCExpr *Value);
 
   /// Emit an weak reference from \p Alias to \p Symbol.
   ///
   /// This corresponds to an assembler statement such as:
   ///  .weakref alias, symbol
   ///
   /// \param Alias - The alias that is being created.
   /// \param Symbol - The symbol being aliased.
   virtual void emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
 
   /// Add the given \p Attribute to \p Symbol.
   virtual bool emitSymbolAttribute(MCSymbol *Symbol,
                                    MCSymbolAttr Attribute) = 0;
 
   /// Set the \p DescValue for the \p Symbol.
   ///
   /// \param Symbol - The symbol to have its n_desc field set.
   /// \param DescValue - The value to set into the n_desc field.
   virtual void emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
 
   /// Start emitting COFF symbol definition
   ///
   /// \param Symbol - The symbol to have its External & Type fields set.
   virtual void beginCOFFSymbolDef(const MCSymbol *Symbol);
 
   /// Emit the storage class of the symbol.
   ///
   /// \param StorageClass - The storage class the symbol should have.
   virtual void emitCOFFSymbolStorageClass(int StorageClass);
 
   /// Emit the type of the symbol.
   ///
   /// \param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h)
   virtual void emitCOFFSymbolType(int Type);
 
   /// Marks the end of the symbol definition.
   virtual void endCOFFSymbolDef();
 
   virtual void emitCOFFSafeSEH(MCSymbol const *Symbol);
 
   /// Emits the symbol table index of a Symbol into the current section.
   virtual void emitCOFFSymbolIndex(MCSymbol const *Symbol);
 
   /// Emits a COFF section index.
   ///
   /// \param Symbol - Symbol the section number relocation should point to.
   virtual void emitCOFFSectionIndex(MCSymbol const *Symbol);
 
   /// Emits a COFF section relative relocation.
   ///
   /// \param Symbol - Symbol the section relative relocation should point to.
   virtual void emitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset);
 
   /// Emits a COFF image relative relocation.
   ///
   /// \param Symbol - Symbol the image relative relocation should point to.
   virtual void emitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset);
 
   /// Emits the physical number of the section containing the given symbol as
   /// assigned during object writing (i.e., this is not a runtime relocation).
   virtual void emitCOFFSecNumber(MCSymbol const *Symbol);
 
   /// Emits the offset of the symbol from the beginning of the section during
   /// object writing (i.e., this is not a runtime relocation).
   virtual void emitCOFFSecOffset(MCSymbol const *Symbol);
 
   /// Emits an lcomm directive with XCOFF csect information.
   ///
   /// \param LabelSym - Label on the block of storage.
   /// \param Size - The size of the block of storage.
   /// \param CsectSym - Csect name for the block of storage.
   /// \param Alignment - The alignment of the symbol in bytes.
   virtual void emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym, uint64_t Size,
                                           MCSymbol *CsectSym, Align Alignment);
 
   /// Emit a symbol's linkage and visibility with a linkage directive for XCOFF.
   ///
   /// \param Symbol - The symbol to emit.
   /// \param Linkage - The linkage of the symbol to emit.
   /// \param Visibility - The visibility of the symbol to emit or MCSA_Invalid
   /// if the symbol does not have an explicit visibility.
   virtual void emitXCOFFSymbolLinkageWithVisibility(MCSymbol *Symbol,
                                                     MCSymbolAttr Linkage,
                                                     MCSymbolAttr Visibility);
 
   /// Emit a XCOFF .rename directive which creates a synonym for an illegal or
   /// undesirable name.
   ///
   /// \param Name - The name used internally in the assembly for references to
   /// the symbol.
   /// \param Rename - The value to which the Name parameter is
   /// changed at the end of assembly.
   virtual void emitXCOFFRenameDirective(const MCSymbol *Name, StringRef Rename);
 
   /// Emit an XCOFF .except directive which adds information about
   /// a trap instruction to the object file exception section
   ///
   /// \param Symbol - The function containing the trap.
   /// \param Lang - The language code for the exception entry.
   /// \param Reason - The reason code for the exception entry.
   virtual void emitXCOFFExceptDirective(const MCSymbol *Symbol,
                                         const MCSymbol *Trap,
                                         unsigned Lang, unsigned Reason,
                                         unsigned FunctionSize, bool hasDebug);
 
   /// Emit a XCOFF .ref directive which creates R_REF type entry in the
   /// relocation table for one or more symbols.
   ///
   /// \param Sym - The symbol on the .ref directive.
   virtual void emitXCOFFRefDirective(const MCSymbol *Symbol);
 
   /// Emit a C_INFO symbol with XCOFF embedded metadata to the .info section.
   ///
   /// \param Name - The embedded metadata name
   /// \param Metadata - The embedded metadata
   virtual void emitXCOFFCInfoSym(StringRef Name, StringRef Metadata);
 
   /// Emit an ELF .size directive.
   ///
   /// This corresponds to an assembler statement such as:
   ///  .size symbol, expression
   virtual void emitELFSize(MCSymbol *Symbol, const MCExpr *Value);
 
   /// Emit an ELF .symver directive.
   ///
   /// This corresponds to an assembler statement such as:
   ///  .symver _start, foo@@SOME_VERSION
   virtual void emitELFSymverDirective(const MCSymbol *OriginalSym,
                                       StringRef Name, bool KeepOriginalSym);
 
   /// Emit a Linker Optimization Hint (LOH) directive.
   /// \param Args - Arguments of the LOH.
   virtual void emitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {}
 
   /// Emit a .gnu_attribute directive.
   virtual void emitGNUAttribute(unsigned Tag, unsigned Value) {}
 
   /// Emit a common symbol.
   ///
   /// \param Symbol - The common symbol to emit.
   /// \param Size - The size of the common symbol.
   /// \param ByteAlignment - The alignment of the symbol.
   virtual void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
                                 Align ByteAlignment) = 0;
 
   /// Emit a local common (.lcomm) symbol.
   ///
   /// \param Symbol - The common symbol to emit.
   /// \param Size - The size of the common symbol.
   /// \param ByteAlignment - The alignment of the common symbol in bytes.
   virtual void emitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
                                      Align ByteAlignment);
 
   /// Emit the zerofill section and an optional symbol.
   ///
   /// \param Section - The zerofill section to create and or to put the symbol
   /// \param Symbol - The zerofill symbol to emit, if non-NULL.
   /// \param Size - The size of the zerofill symbol.
   /// \param ByteAlignment - The alignment of the zerofill symbol.
   virtual void emitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
                             uint64_t Size = 0, Align ByteAlignment = Align(1),
                             SMLoc Loc = SMLoc()) = 0;
 
   /// Emit a thread local bss (.tbss) symbol.
   ///
   /// \param Section - The thread local common section.
   /// \param Symbol - The thread local common symbol to emit.
   /// \param Size - The size of the symbol.
   /// \param ByteAlignment - The alignment of the thread local common symbol.
   virtual void emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
                               uint64_t Size, Align ByteAlignment = Align(1));
 
   /// @}
   /// \name Generating Data
   /// @{
 
   /// Emit the bytes in \p Data into the output.
   ///
   /// This is used to implement assembler directives such as .byte, .ascii,
   /// etc.
   virtual void emitBytes(StringRef Data);
 
   /// Functionally identical to EmitBytes. When emitting textual assembly, this
   /// method uses .byte directives instead of .ascii or .asciz for readability.
   virtual void emitBinaryData(StringRef Data);
 
   /// Emit the expression \p Value into the output as a native
   /// integer of the given \p Size bytes.
   ///
   /// This is used to implement assembler directives such as .word, .quad,
   /// etc.
   ///
   /// \param Value - The value to emit.
   /// \param Size - The size of the integer (in bytes) to emit. This must
   /// match a native machine width.
   /// \param Loc - The location of the expression for error reporting.
   virtual void emitValueImpl(const MCExpr *Value, unsigned Size,
                              SMLoc Loc = SMLoc());
 
   void emitValue(const MCExpr *Value, unsigned Size, SMLoc Loc = SMLoc());
 
   /// Special case of EmitValue that avoids the client having
   /// to pass in a MCExpr for constant integers.
   virtual void emitIntValue(uint64_t Value, unsigned Size);
   virtual void emitIntValue(const APInt &Value);
 
   /// Special case of EmitValue that avoids the client having to pass
   /// in a MCExpr for constant integers & prints in Hex format for certain
   /// modes.
   virtual void emitIntValueInHex(uint64_t Value, unsigned Size) {
     emitIntValue(Value, Size);
   }
 
   void emitInt8(uint64_t Value) { emitIntValue(Value, 1); }
   void emitInt16(uint64_t Value) { emitIntValue(Value, 2); }
   void emitInt32(uint64_t Value) { emitIntValue(Value, 4); }
   void emitInt64(uint64_t Value) { emitIntValue(Value, 8); }
 
   /// Special case of EmitValue that avoids the client having to pass
   /// in a MCExpr for constant integers & prints in Hex format for certain
   /// modes, pads the field with leading zeros to Size width
   virtual void emitIntValueInHexWithPadding(uint64_t Value, unsigned Size) {
     emitIntValue(Value, Size);
   }
 
   virtual void emitULEB128Value(const MCExpr *Value);
 
   virtual void emitSLEB128Value(const MCExpr *Value);
 
   /// Special case of EmitULEB128Value that avoids the client having to
   /// pass in a MCExpr for constant integers.
   unsigned emitULEB128IntValue(uint64_t Value, unsigned PadTo = 0);
 
   /// Special case of EmitSLEB128Value that avoids the client having to
   /// pass in a MCExpr for constant integers.
   unsigned emitSLEB128IntValue(int64_t Value);
 
   /// Special case of EmitValue that avoids the client having to pass in
   /// a MCExpr for MCSymbols.
   void emitSymbolValue(const MCSymbol *Sym, unsigned Size,
                        bool IsSectionRelative = false);
 
   /// Emit the expression \p Value into the output as a dtprel
   /// (64-bit DTP relative) value.
   ///
   /// This is used to implement assembler directives such as .dtpreldword on
   /// targets that support them.
   virtual void emitDTPRel64Value(const MCExpr *Value);
 
   /// Emit the expression \p Value into the output as a dtprel
   /// (32-bit DTP relative) value.
   ///
   /// This is used to implement assembler directives such as .dtprelword on
   /// targets that support them.
   virtual void emitDTPRel32Value(const MCExpr *Value);
 
   /// Emit the expression \p Value into the output as a tprel
   /// (64-bit TP relative) value.
   ///
   /// This is used to implement assembler directives such as .tpreldword on
   /// targets that support them.
   virtual void emitTPRel64Value(const MCExpr *Value);
 
   /// Emit the expression \p Value into the output as a tprel
   /// (32-bit TP relative) value.
   ///
   /// This is used to implement assembler directives such as .tprelword on
   /// targets that support them.
   virtual void emitTPRel32Value(const MCExpr *Value);
 
   /// Emit the expression \p Value into the output as a gprel64 (64-bit
   /// GP relative) value.
   ///
   /// This is used to implement assembler directives such as .gpdword on
   /// targets that support them.
   virtual void emitGPRel64Value(const MCExpr *Value);
 
   /// Emit the expression \p Value into the output as a gprel32 (32-bit
   /// GP relative) value.
   ///
   /// This is used to implement assembler directives such as .gprel32 on
   /// targets that support them.
   virtual void emitGPRel32Value(const MCExpr *Value);
 
   /// Emit NumBytes bytes worth of the value specified by FillValue.
   /// This implements directives such as '.space'.
   void emitFill(uint64_t NumBytes, uint8_t FillValue);
 
   /// Emit \p Size bytes worth of the value specified by \p FillValue.
   ///
   /// This is used to implement assembler directives such as .space or .skip.
   ///
   /// \param NumBytes - The number of bytes to emit.
   /// \param FillValue - The value to use when filling bytes.
   /// \param Loc - The location of the expression for error reporting.
   virtual void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
                         SMLoc Loc = SMLoc());
 
   /// Emit \p NumValues copies of \p Size bytes. Each \p Size bytes is
   /// taken from the lowest order 4 bytes of \p Expr expression.
   ///
   /// This is used to implement assembler directives such as .fill.
   ///
   /// \param NumValues - The number of copies of \p Size bytes to emit.
   /// \param Size - The size (in bytes) of each repeated value.
   /// \param Expr - The expression from which \p Size bytes are used.
   virtual void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
                         SMLoc Loc = SMLoc());
 
   virtual void emitNops(int64_t NumBytes, int64_t ControlledNopLength,
                         SMLoc Loc, const MCSubtargetInfo& STI);
 
   /// Emit NumBytes worth of zeros.
   /// This function properly handles data in virtual sections.
   void emitZeros(uint64_t NumBytes);
 
   /// Emit some number of copies of \p Value until the byte alignment \p
   /// ByteAlignment is reached.
   ///
   /// If the number of bytes need to emit for the alignment is not a multiple
   /// of \p ValueSize, then the contents of the emitted fill bytes is
   /// undefined.
   ///
   /// This used to implement the .align assembler directive.
   ///
   /// \param Alignment - The alignment to reach.
   /// \param Value - The value to use when filling bytes.
   /// \param ValueSize - The size of the integer (in bytes) to emit for
   /// \p Value. This must match a native machine width.
   /// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
   /// the alignment cannot be reached in this many bytes, no bytes are
   /// emitted.
   virtual void emitValueToAlignment(Align Alignment, int64_t Value = 0,
                                     unsigned ValueSize = 1,
                                     unsigned MaxBytesToEmit = 0);
 
   /// Emit nops until the byte alignment \p ByteAlignment is reached.
   ///
   /// This used to align code where the alignment bytes may be executed.  This
   /// can emit different bytes for different sizes to optimize execution.
   ///
   /// \param Alignment - The alignment to reach.
   /// \param STI - The MCSubtargetInfo in operation when padding is emitted.
   /// \param MaxBytesToEmit - The maximum numbers of bytes to emit, or 0. If
   /// the alignment cannot be reached in this many bytes, no bytes are
   /// emitted.
   virtual void emitCodeAlignment(Align Alignment, const MCSubtargetInfo *STI,
                                  unsigned MaxBytesToEmit = 0);
 
   /// Emit some number of copies of \p Value until the byte offset \p
   /// Offset is reached.
   ///
   /// This is used to implement assembler directives such as .org.
   ///
   /// \param Offset - The offset to reach. This may be an expression, but the
   /// expression must be associated with the current section.
   /// \param Value - The value to use when filling bytes.
   virtual void emitValueToOffset(const MCExpr *Offset, unsigned char Value,
                                  SMLoc Loc);
 
   /// @}
 
   /// Switch to a new logical file.  This is used to implement the '.file
   /// "foo.c"' assembler directive.
   virtual void emitFileDirective(StringRef Filename);
 
   /// Emit ".file assembler diretive with additioal info.
   virtual void emitFileDirective(StringRef Filename, StringRef CompilerVersion,
                                  StringRef TimeStamp, StringRef Description);
 
   /// Emit the "identifiers" directive.  This implements the
   /// '.ident "version foo"' assembler directive.
   virtual void emitIdent(StringRef IdentString) {}
 
   /// Associate a filename with a specified logical file number.  This
   /// implements the DWARF2 '.file 4 "foo.c"' assembler directive.
   unsigned emitDwarfFileDirective(
       unsigned FileNo, StringRef Directory, StringRef Filename,
       std::optional<MD5::MD5Result> Checksum = std::nullopt,
       std::optional<StringRef> Source = std::nullopt, unsigned CUID = 0) {
     return cantFail(
         tryEmitDwarfFileDirective(FileNo, Directory, Filename, Checksum,
                                   Source, CUID));
   }
 
   /// Associate a filename with a specified logical file number.
   /// Also associate a directory, optional checksum, and optional source
   /// text with the logical file.  This implements the DWARF2
   /// '.file 4 "dir/foo.c"' assembler directive, and the DWARF5
   /// '.file 4 "dir/foo.c" md5 "..." source "..."' assembler directive.
   virtual Expected<unsigned> tryEmitDwarfFileDirective(
       unsigned FileNo, StringRef Directory, StringRef Filename,
       std::optional<MD5::MD5Result> Checksum = std::nullopt,
       std::optional<StringRef> Source = std::nullopt, unsigned CUID = 0);
 
   /// Specify the "root" file of the compilation, using the ".file 0" extension.
   virtual void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
                                        std::optional<MD5::MD5Result> Checksum,
                                        std::optional<StringRef> Source,
                                        unsigned CUID = 0);
 
   virtual void emitCFIBKeyFrame();
   virtual void emitCFIMTETaggedFrame();
 
   /// This implements the DWARF2 '.loc fileno lineno ...' assembler
   /// directive.
   virtual void emitDwarfLocDirective(unsigned FileNo, unsigned Line,
                                      unsigned Column, unsigned Flags,
                                      unsigned Isa, unsigned Discriminator,
                                      StringRef FileName);
 
   /// This implements the '.loc_label Name' directive.
   virtual void emitDwarfLocLabelDirective(SMLoc Loc, StringRef Name);
 
   /// Associate a filename with a specified logical file number, and also
   /// specify that file's checksum information.  This implements the '.cv_file 4
   /// "foo.c"' assembler directive. Returns true on success.
   virtual bool emitCVFileDirective(unsigned FileNo, StringRef Filename,
                                    ArrayRef<uint8_t> Checksum,
                                    unsigned ChecksumKind);
 
   /// Introduces a function id for use with .cv_loc.
   virtual bool emitCVFuncIdDirective(unsigned FunctionId);
 
   /// Introduces an inline call site id for use with .cv_loc. Includes
   /// extra information for inline line table generation.
   virtual bool emitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
                                            unsigned IAFile, unsigned IALine,
                                            unsigned IACol, SMLoc Loc);
 
   /// This implements the CodeView '.cv_loc' assembler directive.
   virtual void emitCVLocDirective(unsigned FunctionId, unsigned FileNo,
                                   unsigned Line, unsigned Column,
                                   bool PrologueEnd, bool IsStmt,
                                   StringRef FileName, SMLoc Loc);
 
   /// This implements the CodeView '.cv_linetable' assembler directive.
   virtual void emitCVLinetableDirective(unsigned FunctionId,
                                         const MCSymbol *FnStart,
                                         const MCSymbol *FnEnd);
 
   /// This implements the CodeView '.cv_inline_linetable' assembler
   /// directive.
   virtual void emitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
                                               unsigned SourceFileId,
                                               unsigned SourceLineNum,
                                               const MCSymbol *FnStartSym,
                                               const MCSymbol *FnEndSym);
 
   /// This implements the CodeView '.cv_def_range' assembler
   /// directive.
   virtual void emitCVDefRangeDirective(
       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
       StringRef FixedSizePortion);
 
   virtual void emitCVDefRangeDirective(
       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
       codeview::DefRangeRegisterRelHeader DRHdr);
 
   virtual void emitCVDefRangeDirective(
       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
       codeview::DefRangeSubfieldRegisterHeader DRHdr);
 
   virtual void emitCVDefRangeDirective(
       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
       codeview::DefRangeRegisterHeader DRHdr);
 
   virtual void emitCVDefRangeDirective(
       ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
       codeview::DefRangeFramePointerRelHeader DRHdr);
 
   /// This implements the CodeView '.cv_stringtable' assembler directive.
   virtual void emitCVStringTableDirective() {}
 
   /// This implements the CodeView '.cv_filechecksums' assembler directive.
   virtual void emitCVFileChecksumsDirective() {}
 
   /// This implements the CodeView '.cv_filechecksumoffset' assembler
   /// directive.
   virtual void emitCVFileChecksumOffsetDirective(unsigned FileNo) {}
 
   /// This implements the CodeView '.cv_fpo_data' assembler directive.
   virtual void emitCVFPOData(const MCSymbol *ProcSym, SMLoc Loc = {}) {}
 
   /// Emit the absolute difference between two symbols.
   ///
   /// \pre Offset of \c Hi is greater than the offset \c Lo.
   virtual void emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
                                       unsigned Size);
 
   /// Emit the absolute difference between two symbols encoded with ULEB128.
   virtual void emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
                                                const MCSymbol *Lo);
 
   virtual MCSymbol *getDwarfLineTableSymbol(unsigned CUID);
   virtual void emitCFISections(bool EH, bool Debug);
   void emitCFIStartProc(bool IsSimple, SMLoc Loc = SMLoc());
   void emitCFIEndProc();
   virtual void emitCFIDefCfa(int64_t Register, int64_t Offset, SMLoc Loc = {});
   virtual void emitCFIDefCfaOffset(int64_t Offset, SMLoc Loc = {});
   virtual void emitCFIDefCfaRegister(int64_t Register, SMLoc Loc = {});
   virtual void emitCFILLVMDefAspaceCfa(int64_t Register, int64_t Offset,
                                        int64_t AddressSpace, SMLoc Loc = {});
   virtual void emitCFIOffset(int64_t Register, int64_t Offset, SMLoc Loc = {});
   virtual void emitCFIPersonality(const MCSymbol *Sym, unsigned Encoding);
   virtual void emitCFILsda(const MCSymbol *Sym, unsigned Encoding);
   virtual void emitCFIRememberState(SMLoc Loc);
   virtual void emitCFIRestoreState(SMLoc Loc);
   virtual void emitCFISameValue(int64_t Register, SMLoc Loc = {});
   virtual void emitCFIRestore(int64_t Register, SMLoc Loc = {});
   virtual void emitCFIRelOffset(int64_t Register, int64_t Offset, SMLoc Loc);
   virtual void emitCFIAdjustCfaOffset(int64_t Adjustment, SMLoc Loc = {});
   virtual void emitCFIEscape(StringRef Values, SMLoc Loc = {});
   virtual void emitCFIReturnColumn(int64_t Register);
   virtual void emitCFIGnuArgsSize(int64_t Size, SMLoc Loc = {});
   virtual void emitCFISignalFrame();
   virtual void emitCFIUndefined(int64_t Register, SMLoc Loc = {});
   virtual void emitCFIRegister(int64_t Register1, int64_t Register2,
                                SMLoc Loc = {});
   virtual void emitCFIWindowSave(SMLoc Loc = {});
   virtual void emitCFINegateRAState(SMLoc Loc = {});
   virtual void emitCFINegateRAStateWithPC(SMLoc Loc = {});
   virtual void emitCFILabelDirective(SMLoc Loc, StringRef Name);
   virtual void emitCFIValOffset(int64_t Register, int64_t Offset,
                                 SMLoc Loc = {});
 
   virtual void emitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc = SMLoc());
   virtual void emitWinCFIEndProc(SMLoc Loc = SMLoc());
   /// This is used on platforms, such as Windows on ARM64, that require function
   /// or funclet sizes to be emitted in .xdata before the End marker is emitted
   /// for the frame.  We cannot use the End marker, as it is not set at the
   /// point of emitting .xdata, in order to indicate that the frame is active.
   virtual void emitWinCFIFuncletOrFuncEnd(SMLoc Loc = SMLoc());
   virtual void emitWinCFIStartChained(SMLoc Loc = SMLoc());
   virtual void emitWinCFIEndChained(SMLoc Loc = SMLoc());
   virtual void emitWinCFIPushReg(MCRegister Register, SMLoc Loc = SMLoc());
   virtual void emitWinCFISetFrame(MCRegister Register, unsigned Offset,
                                   SMLoc Loc = SMLoc());
   virtual void emitWinCFIAllocStack(unsigned Size, SMLoc Loc = SMLoc());
   virtual void emitWinCFISaveReg(MCRegister Register, unsigned Offset,
                                  SMLoc Loc = SMLoc());
   virtual void emitWinCFISaveXMM(MCRegister Register, unsigned Offset,
                                  SMLoc Loc = SMLoc());
   virtual void emitWinCFIPushFrame(bool Code, SMLoc Loc = SMLoc());
   virtual void emitWinCFIEndProlog(SMLoc Loc = SMLoc());
   virtual void emitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
                                 SMLoc Loc = SMLoc());
   virtual void emitWinEHHandlerData(SMLoc Loc = SMLoc());
 
   virtual void emitCGProfileEntry(const MCSymbolRefExpr *From,
                                   const MCSymbolRefExpr *To, uint64_t Count);
 
   /// Get the .pdata section used for the given section. Typically the given
   /// section is either the main .text section or some other COMDAT .text
   /// section, but it may be any section containing code.
   MCSection *getAssociatedPDataSection(const MCSection *TextSec);
 
   /// Get the .xdata section used for the given section.
   MCSection *getAssociatedXDataSection(const MCSection *TextSec);
 
   virtual void emitSyntaxDirective();
 
   /// Record a relocation described by the .reloc directive. Return std::nullopt
   /// if succeeded. Otherwise, return a pair (Name is invalid, error message).
   virtual std::optional<std::pair<bool, std::string>>
   emitRelocDirective(const MCExpr &Offset, StringRef Name, const MCExpr *Expr,
                      SMLoc Loc, const MCSubtargetInfo &STI) {
     return std::nullopt;
   }
 
   virtual void emitAddrsig() {}
   virtual void emitAddrsigSym(const MCSymbol *Sym) {}
 
   /// Emit the given \p Instruction into the current section.
   virtual void emitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI);
 
   /// Emit the a pseudo probe into the current section.
   virtual void emitPseudoProbe(uint64_t Guid, uint64_t Index, uint64_t Type,
                                uint64_t Attr, uint64_t Discriminator,
                                const MCPseudoProbeInlineStack &InlineStack,
                                MCSymbol *FnSym);
 
   /// Set the bundle alignment mode from now on in the section.
   /// The value 1 means turn the bundle alignment off.
   virtual void emitBundleAlignMode(Align Alignment);
 
   /// The following instructions are a bundle-locked group.
   ///
   /// \param AlignToEnd - If true, the bundle-locked group will be aligned to
   ///                     the end of a bundle.
   virtual void emitBundleLock(bool AlignToEnd);
 
   /// Ends a bundle-locked group.
   virtual void emitBundleUnlock();
 
   /// If this file is backed by a assembly streamer, this dumps the
   /// specified string in the output .s file.  This capability is indicated by
   /// the hasRawTextSupport() predicate.  By default this aborts.
   void emitRawText(const Twine &String);
 
   /// Streamer specific finalization.
   virtual void finishImpl();
   /// Finish emission of machine code.
   void finish(SMLoc EndLoc = SMLoc());
 
   virtual bool mayHaveInstructions(MCSection &Sec) const { return true; }
 
   /// Emit a special value of 0xffffffff if producing 64-bit debugging info.
   void maybeEmitDwarf64Mark();
 
   /// Emit a unit length field. The actual format, DWARF32 or DWARF64, is chosen
   /// according to the settings.
   virtual void emitDwarfUnitLength(uint64_t Length, const Twine &Comment);
 
   /// Emit a unit length field. The actual format, DWARF32 or DWARF64, is chosen
   /// according to the settings.
   /// Return the end symbol generated inside, the caller needs to emit it.
   virtual MCSymbol *emitDwarfUnitLength(const Twine &Prefix,
                                         const Twine &Comment);
 
   /// Emit the debug line start label.
   virtual void emitDwarfLineStartLabel(MCSymbol *StartSym);
 
   /// Emit the debug line end entry.
   virtual void emitDwarfLineEndEntry(MCSection *Section, MCSymbol *LastLabel,
                                      MCSymbol *EndLabel = nullptr) {}
 
   /// If targets does not support representing debug line section by .loc/.file
   /// directives in assembly output, we need to populate debug line section with
   /// raw debug line contents.
   virtual void emitDwarfAdvanceLineAddr(int64_t LineDelta,
                                         const MCSymbol *LastLabel,
                                         const MCSymbol *Label,
                                         unsigned PointerSize) {}
 };
 
 /// Create a dummy machine code streamer, which does nothing. This is useful for
 /// timing the assembler front end.
 MCStreamer *createNullStreamer(MCContext &Ctx);
 
 } // end namespace llvm
 
 #endif // LLVM_MC_MCSTREAMER_H

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