//===- MCStreamer.h - High-level Streaming Machine Code Output --*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file declares the MCStreamer class. // //===----------------------------------------------------------------------===// #ifndef LLVM_MC_MCSTREAMER_H #define LLVM_MC_MCSTREAMER_H #include "llvm/ADT/ArrayRef.h" #include "llvm/ADT/SmallVector.h" #include "llvm/MC/MCDirectives.h" #include "llvm/MC/MCDwarf.h" #include "llvm/MC/MCLinkerOptimizationHint.h" #include "llvm/MC/MCSymbol.h" #include "llvm/MC/MCWinEH.h" #include "llvm/Support/DataTypes.h" #include "llvm/Support/SMLoc.h" #include <string> namespace llvm { class MCAsmBackend; class MCCodeEmitter; class MCContext; class MCExpr; class MCInst; class MCInstPrinter; class MCSection; class MCStreamer; class MCSymbolELF; class MCSymbolRefExpr; class MCSubtargetInfo; class StringRef; class Twine; class raw_ostream; class formatted_raw_ostream; class AssemblerConstantPools; typedef std::pair<MCSection *, const MCExpr *> MCSectionSubPair; /// 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, raw_ostream &OS, const MCInst &Inst, const MCSubtargetInfo &STI); 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(unsigned FpReg, unsigned SpReg, int64_t Offset = 0); virtual void emitMovSP(unsigned Reg, int64_t Offset = 0); virtual void emitPad(int64_t Offset); virtual void emitRegSave(const SmallVectorImpl<unsigned> &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(unsigned FPU); virtual void emitArch(unsigned Arch); virtual void emitArchExtension(unsigned ArchExt); virtual void emitObjectArch(unsigned Arch); 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 finish() override; /// 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 implemnt the .ltorg directive. /// Emit contents of constant pool for the current section. void emitCurrentConstantPool(); private: std::unique_ptr<AssemblerConstantPools> ConstantPools; }; /// \brief Streaming machine code generation interface. /// /// This interface is intended to provide a programatic 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; MCStreamer(const MCStreamer &) = delete; MCStreamer &operator=(const MCStreamer &) = delete; std::vector<MCDwarfFrameInfo> DwarfFrameInfos; MCDwarfFrameInfo *getCurrentDwarfFrameInfo(); void EnsureValidDwarfFrame(); MCSymbol *EmitCFICommon(); std::vector<WinEH::FrameInfo *> WinFrameInfos; WinEH::FrameInfo *CurrentWinFrameInfo; void EnsureValidWinFrameInfo(); /// \brief Tracks an index to represent the order a symbol was emitted in. /// Zero means we did not emit that symbol. DenseMap<const MCSymbol *, unsigned> SymbolOrdering; /// \brief This is stack of current and previous section values saved by /// PushSection. SmallVector<std::pair<MCSectionSubPair, MCSectionSubPair>, 4> SectionStack; protected: MCStreamer(MCContext &Ctx); virtual void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame); virtual void EmitCFIEndProcImpl(MCDwarfFrameInfo &CurFrame); WinEH::FrameInfo *getCurrentWinFrameInfo() { return CurrentWinFrameInfo; } virtual void EmitWindowsUnwindTables(); virtual void EmitRawTextImpl(StringRef String); public: virtual ~MCStreamer(); void visitUsedExpr(const MCExpr &Expr); virtual void visitUsedSymbol(const MCSymbol &Sym); void setTargetStreamer(MCTargetStreamer *TS) { TargetStreamer.reset(TS); } /// State management /// virtual void reset(); MCContext &getContext() const { return Context; } MCTargetStreamer *getTargetStreamer() { return TargetStreamer.get(); } unsigned getNumFrameInfos() { return DwarfFrameInfos.size(); } ArrayRef<MCDwarfFrameInfo> getDwarfFrameInfos() const { return DwarfFrameInfos; } unsigned getNumWinFrameInfos() { return WinFrameInfos.size(); } ArrayRef<WinEH::FrameInfo *> getWinFrameInfos() const { return WinFrameInfos; } void generateCompactUnwindEncodings(MCAsmBackend *MAB); /// \name Assembly File Formatting. /// @{ /// \brief Return true if this streamer supports verbose assembly and if it is /// enabled. virtual bool isVerboseAsm() const { return false; } /// \brief Return true if this asm streamer supports emitting unformatted text /// to the .s file with EmitRawText. virtual bool hasRawTextSupport() const { return false; } /// \brief Is the integrated assembler required for this streamer to function /// correctly? virtual bool isIntegratedAssemblerRequired() const { return false; } /// \brief Add a textual command. /// /// 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. virtual void AddComment(const Twine &T) {} /// \brief 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(); /// \brief 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); /// AddBlankLine - Emit a blank line to a .s file to pretty it up. virtual void AddBlankLine() {} /// @} /// \name Symbol & Section Management /// @{ /// \brief 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 getCurrentSection().first; } /// \brief Return the previous section that the streamer is emitting code to. MCSectionSubPair getPreviousSection() const { if (!SectionStack.empty()) return SectionStack.back().second; return MCSectionSubPair(); } /// \brief Returns an index to represent the order a symbol was emitted in. /// (zero if we did not emit that symbol) unsigned GetSymbolOrder(const MCSymbol *Sym) const { return SymbolOrdering.lookup(Sym); } /// \brief Update streamer for a new active section. /// /// This is called by PopSection and SwitchSection, if the current /// section changes. virtual void ChangeSection(MCSection *, const MCExpr *); /// \brief Save the current and previous section on the section stack. void PushSection() { SectionStack.push_back( std::make_pair(getCurrentSection(), getPreviousSection())); } /// \brief Restore the current and previous section from the section stack. /// Calls ChangeSection as needed. /// /// Returns false if the stack was empty. bool PopSection() { if (SectionStack.size() <= 1) return false; auto I = SectionStack.end(); --I; MCSectionSubPair OldSection = I->first; --I; MCSectionSubPair NewSection = I->first; if (OldSection != NewSection) ChangeSection(NewSection.first, NewSection.second); SectionStack.pop_back(); return true; } bool SubSection(const MCExpr *Subsection) { if (SectionStack.empty()) return false; SwitchSection(SectionStack.back().first.first, Subsection); return true; } /// 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, const MCExpr *Subsection = nullptr); /// \brief Set the current section where code is being emitted to \p Section. /// This is required to update CurSection. This version does not call /// ChangeSection. void SwitchSectionNoChange(MCSection *Section, const MCExpr *Subsection = nullptr) { assert(Section && "Cannot switch to a null section!"); MCSectionSubPair curSection = SectionStack.back().first; SectionStack.back().second = curSection; if (MCSectionSubPair(Section, Subsection) != curSection) SectionStack.back().first = MCSectionSubPair(Section, Subsection); } /// \brief Create the default sections and set the initial one. virtual void InitSections(bool NoExecStack); MCSymbol *endSection(MCSection *Section); /// \brief Sets the symbol's section. /// /// Each emitted symbol will be tracked in the ordering table, /// so we can sort on them later. void AssignFragment(MCSymbol *Symbol, MCFragment *Fragment); /// \brief 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); virtual void EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol); /// \brief Note in the output the specified \p Flag. virtual void EmitAssemblerFlag(MCAssemblerFlag Flag); /// \brief Emit the given list \p Options of strings as linker /// options into the output. virtual void EmitLinkerOptions(ArrayRef<std::string> Kind) {} /// \brief Note in the output the specified region \p Kind. virtual void EmitDataRegion(MCDataRegionType Kind) {} /// \brief Specify the MachO minimum deployment target version. virtual void EmitVersionMin(MCVersionMinType, unsigned Major, unsigned Minor, unsigned Update) {} /// \brief Note in the output that the specified \p Func is a Thumb mode /// function (ARM target only). virtual void EmitThumbFunc(MCSymbol *Func); /// \brief 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); /// \brief 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); /// \brief Add the given \p Attribute to \p Symbol. virtual bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) = 0; /// \brief 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); /// \brief Start emitting COFF symbol definition /// /// \param Symbol - The symbol to have its External & Type fields set. virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol); /// \brief Emit the storage class of the symbol. /// /// \param StorageClass - The storage class the symbol should have. virtual void EmitCOFFSymbolStorageClass(int StorageClass); /// \brief Emit the type of the symbol. /// /// \param Type - A COFF type identifier (see COFF::SymbolType in X86COFF.h) virtual void EmitCOFFSymbolType(int Type); /// \brief Marks the end of the symbol definition. virtual void EndCOFFSymbolDef(); virtual void EmitCOFFSafeSEH(MCSymbol const *Symbol); /// \brief Emits a COFF section index. /// /// \param Symbol - Symbol the section number relocation should point to. virtual void EmitCOFFSectionIndex(MCSymbol const *Symbol); /// \brief Emits a COFF section relative relocation. /// /// \param Symbol - Symbol the section relative relocation should point to. virtual void EmitCOFFSecRel32(MCSymbol const *Symbol); /// \brief Emit an ELF .size directive. /// /// This corresponds to an assembler statement such as: /// .size symbol, expression virtual void emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value); /// \brief Emit a Linker Optimization Hint (LOH) directive. /// \param Args - Arguments of the LOH. virtual void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {} /// \brief 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 if /// non-zero. This must be a power of 2. virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size, unsigned ByteAlignment) = 0; /// \brief 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, unsigned ByteAlignment); /// \brief 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 if /// non-zero. This must be a power of 2 on some targets. virtual void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr, uint64_t Size = 0, unsigned ByteAlignment = 0) = 0; /// \brief 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 /// if non-zero. This must be a power of 2 on some targets. virtual void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size, unsigned ByteAlignment = 0); /// @} /// \name Generating Data /// @{ /// \brief 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); /// \brief 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()); /// \brief 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 EmitULEB128Value(const MCExpr *Value); virtual void EmitSLEB128Value(const MCExpr *Value); /// \brief Special case of EmitULEB128Value that avoids the client having to /// pass in a MCExpr for constant integers. void EmitULEB128IntValue(uint64_t Value, unsigned Padding = 0); /// \brief Special case of EmitSLEB128Value that avoids the client having to /// pass in a MCExpr for constant integers. void EmitSLEB128IntValue(int64_t Value); /// \brief 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); /// \brief 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); /// \brief 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); /// \brief Emit NumBytes bytes worth of the value specified by FillValue. /// This implements directives such as '.space'. virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue); /// \brief Emit NumBytes worth of zeros. /// This function properly handles data in virtual sections. void EmitZeros(uint64_t NumBytes); /// \brief 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 ByteAlignment - The alignment to reach. This must be a power of /// two on some targets. /// \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(unsigned ByteAlignment, int64_t Value = 0, unsigned ValueSize = 1, unsigned MaxBytesToEmit = 0); /// \brief 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 ByteAlignment - The alignment to reach. This must be a power of /// two on some targets. /// \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(unsigned ByteAlignment, unsigned MaxBytesToEmit = 0); /// \brief 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 = 0); /// @} /// \brief Switch to a new logical file. This is used to implement the '.file /// "foo.c"' assembler directive. virtual void EmitFileDirective(StringRef Filename); /// \brief Emit the "identifiers" directive. This implements the /// '.ident "version foo"' assembler directive. virtual void EmitIdent(StringRef IdentString) {} /// \brief Associate a filename with a specified logical file number. This /// implements the DWARF2 '.file 4 "foo.c"' assembler directive. virtual unsigned EmitDwarfFileDirective(unsigned FileNo, StringRef Directory, StringRef Filename, unsigned CUID = 0); /// \brief 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); /// 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); virtual MCSymbol *getDwarfLineTableSymbol(unsigned CUID); virtual void EmitCFISections(bool EH, bool Debug); void EmitCFIStartProc(bool IsSimple); void EmitCFIEndProc(); virtual void EmitCFIDefCfa(int64_t Register, int64_t Offset); virtual void EmitCFIDefCfaOffset(int64_t Offset); virtual void EmitCFIDefCfaRegister(int64_t Register); virtual void EmitCFIOffset(int64_t Register, int64_t Offset); virtual void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding); virtual void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding); virtual void EmitCFIRememberState(); virtual void EmitCFIRestoreState(); virtual void EmitCFISameValue(int64_t Register); virtual void EmitCFIRestore(int64_t Register); virtual void EmitCFIRelOffset(int64_t Register, int64_t Offset); virtual void EmitCFIAdjustCfaOffset(int64_t Adjustment); virtual void EmitCFIEscape(StringRef Values); virtual void EmitCFIGnuArgsSize(int64_t Size); virtual void EmitCFISignalFrame(); virtual void EmitCFIUndefined(int64_t Register); virtual void EmitCFIRegister(int64_t Register1, int64_t Register2); virtual void EmitCFIWindowSave(); virtual void EmitWinCFIStartProc(const MCSymbol *Symbol); virtual void EmitWinCFIEndProc(); virtual void EmitWinCFIStartChained(); virtual void EmitWinCFIEndChained(); virtual void EmitWinCFIPushReg(unsigned Register); virtual void EmitWinCFISetFrame(unsigned Register, unsigned Offset); virtual void EmitWinCFIAllocStack(unsigned Size); virtual void EmitWinCFISaveReg(unsigned Register, unsigned Offset); virtual void EmitWinCFISaveXMM(unsigned Register, unsigned Offset); virtual void EmitWinCFIPushFrame(bool Code); virtual void EmitWinCFIEndProlog(); virtual void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except); virtual void EmitWinEHHandlerData(); virtual void EmitSyntaxDirective(); /// \brief Emit a .reloc directive. /// Returns true if the relocation could not be emitted because Name is not /// known. virtual bool EmitRelocDirective(const MCExpr &Offset, StringRef Name, const MCExpr *Expr, SMLoc Loc) { return true; } /// \brief Emit the given \p Instruction into the current section. virtual void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI); /// \brief Set the bundle alignment mode from now on in the section. /// The argument is the power of 2 to which the alignment is set. The /// value 0 means turn the bundle alignment off. virtual void EmitBundleAlignMode(unsigned AlignPow2); /// \brief 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); /// \brief Ends a bundle-locked group. virtual void EmitBundleUnlock(); /// \brief 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); /// \brief Streamer specific finalization. virtual void FinishImpl(); /// \brief Finish emission of machine code. void Finish(); virtual bool mayHaveInstructions(MCSection &Sec) const { return true; } }; /// Create a dummy machine code streamer, which does nothing. This is useful for /// timing the assembler front end. MCStreamer *createNullStreamer(MCContext &Ctx); /// Create a machine code streamer which will print out assembly for the native /// target, suitable for compiling with a native assembler. /// /// \param InstPrint - If given, the instruction printer to use. If not given /// the MCInst representation will be printed. This method takes ownership of /// InstPrint. /// /// \param CE - If given, a code emitter to use to show the instruction /// encoding inline with the assembly. This method takes ownership of \p CE. /// /// \param TAB - If given, a target asm backend to use to show the fixup /// information in conjunction with encoding information. This method takes /// ownership of \p TAB. /// /// \param ShowInst - Whether to show the MCInst representation inline with /// the assembly. MCStreamer *createAsmStreamer(MCContext &Ctx, std::unique_ptr<formatted_raw_ostream> OS, bool isVerboseAsm, bool useDwarfDirectory, MCInstPrinter *InstPrint, MCCodeEmitter *CE, MCAsmBackend *TAB, bool ShowInst); } // end namespace llvm #endif