MCAsmInfo.h

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//===-- llvm/MC/MCAsmInfo.h - Asm info --------------------------*- 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 contains a class to be used as the basis for target specific
// asm writers.  This class primarily takes care of global printing constants,
// which are used in very similar ways across all targets.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_MC_MCASMINFO_H
#define LLVM_MC_MCASMINFO_H
 
#include "llvm/ADT/CachedHashString.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/Support/Compiler.h"
#include <vector>
 
namespace llvm {
 
template <typename, unsigned> class EnumStrings;
class MCAssembler;
class MCContext;
class MCCFIInstruction;
class MCExpr;
class MCSpecifierExpr;
class MCSection;
class MCStreamer;
class MCSubtargetInfo;
class MCSymbol;
class MCValue;
class Triple;
class raw_ostream;
 
namespace WinEH {
 
enum class EncodingType {
  Invalid, /// Invalid
  Alpha,   /// Windows Alpha
  Alpha64, /// Windows AXP64
  ARM,     /// Windows NT (Windows on ARM)
  CE,      /// Windows CE ARM, PowerPC, SH3, SH4
  Itanium, /// Windows x64, Windows Itanium (IA-64)
  X86,     /// Windows x86, uses no CFI, just EH tables
  MIPS = Alpha,
};
 
} // end namespace WinEH
 
namespace LCOMM {
 
enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
 
} // end namespace LCOMM
 
/// This class is intended to be used as a base class for asm
/// properties and features specific to the target.
class LLVM_ABI MCAsmInfo {
public:
  /// Assembly character literal syntax types.
  enum AsmCharLiteralSyntax {
    ACLS_Unknown, /// Unknown; character literals not used by LLVM for this
                  /// target.
    ACLS_SingleQuotePrefix, /// The desired character is prefixed by a single
                            /// quote, e.g., `'A`.
  };
 
  /// Type for at specifiers. Currently, 16 bits is enough.
  using AtSpecifierKind = uint16_t;
 
protected:
  //===------------------------------------------------------------------===//
  // Properties to be set by the target writer, used to configure asm printer.
  //
 
  /// Code pointer size in bytes.  Default is 4.
  unsigned CodePointerSize = 4;
 
  /// Size of the stack slot reserved for callee-saved registers, in bytes.
  /// Default is same as pointer size.
  unsigned CalleeSaveStackSlotSize = 4;
 
  /// True if target is little endian.  Default is true.
  bool IsLittleEndian = true;
 
  /// True if target stack grow up.  Default is false.
  bool StackGrowsUp = false;
 
  /// True if this target has the MachO .subsections_via_symbols directive.
  /// Default is false.
  bool HasSubsectionsViaSymbols = false;
 
  /// True if this is a non-GNU COFF target. The COFF port of the GNU linker
  /// doesn't handle associative comdats in the way that we would like to use
  /// them.
  bool HasCOFFAssociativeComdats = false;
 
  /// True if this is a non-GNU COFF target. For GNU targets, we don't generate
  /// constants into comdat sections.
  bool HasCOFFComdatConstants = false;
 
  bool IsAIX = false;
 
  // True if using the HLASM dialect on z/OS.
  bool IsHLASM = false;
 
  /// This is the maximum possible length of an instruction, which is needed to
  /// compute the size of an inline asm.  Defaults to 4.
  unsigned MaxInstLength = 4;
 
  /// Every possible instruction length is a multiple of this value.  Factored
  /// out in .debug_frame and .debug_line.  Defaults to 1.
  unsigned MinInstAlignment = 1;
 
  /// The '$' token, when not referencing an identifier or constant, refers to
  /// the current PC.  Defaults to false.
  bool DollarIsPC = false;
 
  /// This string, if specified, is used to separate instructions from each
  /// other when on the same line.  Defaults to ';'
  const char *SeparatorString = ";";
 
  /// This indicates the comment string used by the assembler.  Defaults to
  /// "#"
  StringRef CommentString = "#";
 
  /// This indicates whether to allow additional "comment strings" to be lexed
  /// as a comment. Setting this attribute to true, will ensure that C-style
  /// line comments (// ..), C-style block comments (/* .. */), and "#" are
  /// all treated as comments in addition to the string specified by the
  /// CommentString attribute.
  /// Default is true.
  bool AllowAdditionalComments = true;
 
  /// This is appended to emitted labels.  Defaults to ":"
  const char *LabelSuffix = ":";
 
  /// Use .set instead of = to equate a symbol to an expression.
  bool UsesSetToEquateSymbol = false;
 
  // Print the EH begin symbol with an assignment. Defaults to false.
  bool UseAssignmentForEHBegin = false;
 
  // Do we need to create a local symbol for .size?
  bool NeedsLocalForSize = false;
 
  /// For internal use by compiler and assembler, not meant to be visible
  /// externally. They are usually not emitted to the symbol table in the
  /// object file. This is also used for labels for basic blocks.
  StringRef InternalSymbolPrefix = "L";
 
  /// This prefix is used for symbols that should be passed through the
  /// assembler but be removed by the linker.  This is 'l' on Darwin, currently
  /// used for some ObjC metadata.  The default of "" meast that for this system
  /// a plain private symbol should be used.  Defaults to "".
  StringRef LinkerPrivateGlobalPrefix = "";
 
  /// If these are nonempty, they contain a directive to emit before and after
  /// an inline assembly statement.  Defaults to "APP", "NO_APP"
  const char *InlineAsmStart = "APP";
  const char *InlineAsmEnd = "NO_APP";
 
  /// Which dialect of an assembler variant to use.  Defaults to 0
  unsigned AssemblerDialect = 0;
 
  /// This is true if the assembler allows @ characters in symbol names.
  /// Defaults to false.
  bool AllowAtInName = false;
 
  /// This is true if the assembler allows the "?" character at the start of
  /// of a string to be lexed as an AsmToken::Identifier.
  /// If the AsmLexer determines that the string can be lexed as a possible
  /// comment, setting this option will have no effect, and the string will
  /// still be lexed as a comment.
  bool AllowQuestionAtStartOfIdentifier = false;
 
  /// This is true if the assembler allows the "$" character at the start of
  /// of a string to be lexed as an AsmToken::Identifier.
  /// If the AsmLexer determines that the string can be lexed as a possible
  /// comment, setting this option will have no effect, and the string will
  /// still be lexed as a comment.
  bool AllowDollarAtStartOfIdentifier = false;
 
  /// This is true if the assembler allows the "@" character at the start of
  /// a string to be lexed as an AsmToken::Identifier.
  /// If the AsmLexer determines that the string can be lexed as a possible
  /// comment, setting this option will have no effect, and the string will
  /// still be lexed as a comment.
  bool AllowAtAtStartOfIdentifier = false;
 
  /// If this is true, symbol names with invalid characters will be printed in
  /// quotes.
  bool SupportsQuotedNames = true;
 
  /// This is true if data region markers should be printed as
  /// ".data_region/.end_data_region" directives. If false, use "$d/$a" labels
  /// instead.
  bool UseDataRegionDirectives = false;
 
  /// True if the target supports LEB128 directives.
  bool HasLEB128Directives = true;
 
  /// True if full register names are printed.
  bool PPCUseFullRegisterNames = false;
 
  //===--- Data Emission Directives -------------------------------------===//
 
  /// This should be set to the directive used to get some number of zero (and
  /// non-zero if supported by the directive) bytes emitted to the current
  /// section. Common cases are "\t.zero\t" and "\t.space\t". Defaults to
  /// "\t.zero\t"
  const char *ZeroDirective = "\t.zero\t";
 
  /// This directive allows emission of an ascii string with the standard C
  /// escape characters embedded into it.  If a target doesn't support this, it
  /// can be set to null. Defaults to "\t.ascii\t"
  const char *AsciiDirective = "\t.ascii\t";
 
  /// If not null, this allows for special handling of zero terminated strings
  /// on this target.  This is commonly supported as ".asciz".  If a target
  /// doesn't support this, it can be set to null.  Defaults to "\t.asciz\t"
  const char *AscizDirective = "\t.asciz\t";
 
  /// Form used for character literals in the assembly syntax.  Useful for
  /// producing strings as byte lists.  If a target does not use or support
  /// this, it shall be set to ACLS_Unknown.  Defaults to ACLS_Unknown.
  AsmCharLiteralSyntax CharacterLiteralSyntax = ACLS_Unknown;
 
  /// These directives are used to output some unit of integer data to the
  /// current section.  If a data directive is set to null, smaller data
  /// directives will be used to emit the large sizes.  Defaults to "\t.byte\t",
  /// "\t.short\t", "\t.long\t", "\t.quad\t"
  const char *Data8bitsDirective = "\t.byte\t";
  const char *Data16bitsDirective = "\t.short\t";
  const char *Data32bitsDirective = "\t.long\t";
  const char *Data64bitsDirective = "\t.quad\t";
 
  /// True if data directives support signed values
  bool SupportsSignedData = true;
 
  /// This is true if this target uses "Sun Style" syntax for section switching
  /// ("#alloc,#write" etc) instead of the normal ELF syntax (,"a,w") in
  /// .section directives.  Defaults to false.
  bool SunStyleELFSectionSwitchSyntax = false;
 
  /// This is true if this target uses ELF '.section' directive before the
  /// '.bss' one. It's used for PPC/Linux which doesn't support the '.bss'
  /// directive only.  Defaults to false.
  bool UsesELFSectionDirectiveForBSS = false;
 
  bool NeedsDwarfSectionOffsetDirective = false;
 
  //===--- Alignment Information ----------------------------------------===//
 
  /// If this is true (the default) then the asmprinter emits ".align N"
  /// directives, where N is the number of bytes to align to.  Otherwise, it
  /// emits ".align log2(N)", e.g. 3 to align to an 8 byte boundary.  Defaults
  /// to true.
  bool AlignmentIsInBytes = true;
 
  /// If non-zero, this is used to fill the executable space created as the
  /// result of a alignment directive.  Defaults to 0
  unsigned TextAlignFillValue = 0;
 
  //===--- Global Variable Emission Directives --------------------------===//
 
  /// This is the directive used to declare a global entity. Defaults to
  /// ".globl".
  const char *GlobalDirective = "\t.globl\t";
 
  /// True if the expression
  ///   .long f - g
  /// uses a relocation but it can be suppressed by writing
  ///   a = f - g
  ///   .long a
  bool SetDirectiveSuppressesReloc = false;
 
  /// True is .comm's and .lcomms optional alignment is to be specified in bytes
  /// instead of log2(n).  Defaults to true.
  bool COMMDirectiveAlignmentIsInBytes = true;
 
  /// Describes if the .lcomm directive for the target supports an alignment
  /// argument and how it is interpreted.  Defaults to NoAlignment.
  LCOMM::LCOMMType LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
 
  // True if the target allows .align directives on functions. This is true for
  // most targets, so defaults to true.
  bool HasFunctionAlignment = true;
 
  // True if the target respects .prefalign directives.
  bool HasPreferredAlignment = false;
 
  /// True if the target has .type and .size directives, this is true for most
  /// ELF targets.  Defaults to true.
  bool HasDotTypeDotSizeDirective = true;
 
  /// True if the target has a single parameter .file directive, this is true
  /// for ELF targets.  Defaults to true.
  bool HasSingleParameterDotFile = true;
 
  /// True if the target has a .ident directive, this is true for ELF targets.
  /// Defaults to false.
  bool HasIdentDirective = false;
 
  /// True if this target supports the MachO .no_dead_strip directive.  Defaults
  /// to false.
  bool HasNoDeadStrip = false;
 
  /// Used to declare a global as being a weak symbol. Defaults to ".weak".
  const char *WeakDirective = "\t.weak\t";
 
  /// This directive, if non-null, is used to declare a global as being a weak
  /// undefined symbol.  Defaults to nullptr.
  const char *WeakRefDirective = nullptr;
 
  /// True if we have a directive to declare a global as being a weak defined
  /// symbol that can be hidden (unexported).  Defaults to false.
  bool HasWeakDefCanBeHiddenDirective = false;
 
  /// True if we should mark symbols as global instead of weak, for
  /// weak*/linkonce*, if the symbol has a comdat.
  /// Defaults to false.
  bool AvoidWeakIfComdat = false;
 
  /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
  /// hidden visibility.  Defaults to MCSA_Hidden.
  MCSymbolAttr HiddenVisibilityAttr = MCSA_Hidden;
 
  /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
  /// exported visibility.  Defaults to MCSA_Exported.
  MCSymbolAttr ExportedVisibilityAttr = MCSA_Exported;
 
  /// This attribute, if not MCSA_Invalid, is used to declare an undefined
  /// symbol as having hidden visibility. Defaults to MCSA_Hidden.
  MCSymbolAttr HiddenDeclarationVisibilityAttr = MCSA_Hidden;
 
  /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
  /// protected visibility.  Defaults to MCSA_Protected
  MCSymbolAttr ProtectedVisibilityAttr = MCSA_Protected;
 
  //===--- Dwarf Emission Directives -----------------------------------===//
 
  /// True if target supports emission of debugging information.  Defaults to
  /// false.
  bool SupportsDebugInformation = false;
 
  /// True if target uses CFI unwind information for other purposes than EH
  /// (debugging / sanitizers) when the exception model is
  /// `ExceptionHandling::None`.
  bool UsesCFIWithoutEH = false;
 
  /// Windows exception handling data (.pdata) encoding.  Defaults to Invalid.
  WinEH::EncodingType WinEHEncodingType = WinEH::EncodingType::Invalid;
 
  /// True if Dwarf2 output generally uses relocations for references to other
  /// .debug_* sections.
  bool DwarfUsesRelocationsAcrossSections = true;
 
  /// True if DWARF FDE symbol reference relocations should be replaced by an
  /// absolute difference.
  bool DwarfFDESymbolsUseAbsDiff = false;
 
  /// The optional specifier to use for the relative FDE symbol references.
  uint16_t DwarfFDERelSymbolSpec = 0;
 
  /// True if DWARF `.file directory' directive syntax is used by
  /// default.
  bool EnableDwarfFileDirectoryDefault = true;
 
  /// True if dwarf register numbers are printed instead of symbolic register
  /// names in .cfi_* directives.  Defaults to false.
  bool DwarfRegNumForCFI = false;
 
  /// True if target uses @ (expr@specifier) for relocation specifiers.
  bool UseAtForSpecifier = false;
 
  /// (ARM-specific) Uses parens for relocation specifier in data
  /// directives, e.g. .word foo(got).
  bool UseParensForSpecifier = false;
 
  /// True if the target supports flags in ".loc" directive, false if only
  /// location is allowed.
  bool SupportsExtendedDwarfLocDirective = true;
 
  //===--- Prologue State ----------------------------------------------===//
 
  std::vector<MCCFIInstruction> InitialFrameState;
 
  //===--- Integrated Assembler Information ----------------------------===//
 
  // Generated object files can use all ELF features supported by GNU ld of
  // this binutils version and later. INT_MAX means all features can be used,
  // regardless of GNU ld support. The default value is referenced by
  // clang/Options/Options.td.
  std::pair<int, int> BinutilsVersion = {2, 26};
 
  /// Should we use the integrated assembler?
  /// The integrated assembler should be enabled by default (by the
  /// constructors) when failing to parse a valid piece of assembly (inline
  /// or otherwise) is considered a bug. It may then be overridden after
  /// construction (see CodeGenTargetMachineImpl::initAsmInfo()).
  bool UseIntegratedAssembler = true;
 
  /// Use AsmParser to parse inlineAsm when UseIntegratedAssembler is not set.
  bool ParseInlineAsmUsingAsmParser = false;
 
  /// Preserve Comments in assembly
  bool PreserveAsmComments = true;
 
  /// The column (zero-based) at which asm comments should be printed.
  unsigned CommentColumn = 40;
 
  /// True if the integrated assembler should interpret 'a >> b' constant
  /// expressions as logical rather than arithmetic.
  bool UseLogicalShr = true;
 
  // If true, use Motorola-style integers in Assembly (ex. $0ac).
  bool UseMotorolaIntegers = false;
 
  // This describes a @ style relocation specifier (expr@specifier) supported by
  // AsmParser::parsePrimaryExpr.
  llvm::DenseMap<AtSpecifierKind, StringRef> AtSpecifierToName;
  llvm::StringMap<AtSpecifierKind> NameToAtSpecifier;
  void initializeAtSpecifiers(EnumStrings<AtSpecifierKind, 1>);
 
  // Lowercase identifiers (e.g. register names, dialect keywords) that must be
  // quoted when used as a symbol name.
  llvm::DenseSet<llvm::CachedHashStringRef> ReservedIdentifiers;
 
  const MCTargetOptions &TargetOptions;
 
public:
  explicit MCAsmInfo(const MCTargetOptions &Options);
  virtual ~MCAsmInfo();
 
  // Explicitly non-copyable.
  MCAsmInfo(MCAsmInfo const &) = delete;
  MCAsmInfo &operator=(MCAsmInfo const &) = delete;
 
  const MCTargetOptions &getTargetOptions() const { return TargetOptions; }
 
  /// Get the code pointer size in bytes.
  unsigned getCodePointerSize() const { return CodePointerSize; }
 
  /// Get the callee-saved register stack slot
  /// size in bytes.
  unsigned getCalleeSaveStackSlotSize() const {
    return CalleeSaveStackSlotSize;
  }
 
  /// True if the target is little endian.
  bool isLittleEndian() const { return IsLittleEndian; }
 
  /// True if target stack grow up.
  bool isStackGrowthDirectionUp() const { return StackGrowsUp; }
 
  bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
 
  // Data directive accessors.
 
  const char *getData8bitsDirective() const { return Data8bitsDirective; }
  const char *getData16bitsDirective() const { return Data16bitsDirective; }
  const char *getData32bitsDirective() const { return Data32bitsDirective; }
  const char *getData64bitsDirective() const { return Data64bitsDirective; }
  bool supportsSignedData() const { return SupportsSignedData; }
 
  /// Targets can implement this method to specify a section to switch to
  /// depending on whether the translation unit has any trampolines that require
  /// an executable stack.
  virtual MCSection *getStackSection(MCContext &Ctx, bool Exec) const {
    return nullptr;
  }
 
  virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
                                                    unsigned Encoding,
                                                    MCStreamer &Streamer) const;
 
  const MCExpr *getExprForFDESymbol(const MCSymbol *Sym, unsigned Encoding,
                                    MCStreamer &Streamer) const;
 
  /// Return true if C is an acceptable character inside a symbol name.
  bool isAcceptableChar(char C) const;
 
  /// Return true if the identifier \p Name does not need quotes to be
  /// syntactically correct.
  bool isValidUnquotedName(StringRef Name) const;
 
  llvm::DenseSet<llvm::CachedHashStringRef> &getReservedIdentifiers() {
    return ReservedIdentifiers;
  }
  const llvm::DenseSet<llvm::CachedHashStringRef> &
  getReservedIdentifiers() const {
    return ReservedIdentifiers;
  }
 
  virtual void printSwitchToSection(const MCSection &, uint32_t Subsection,
                                    const Triple &, raw_ostream &) const {}
 
  /// Return true if the .section directive should be omitted when
  /// emitting \p SectionName.  For example:
  ///
  /// shouldOmitSectionDirective(".text")
  ///
  /// returns false => .section .text,#alloc,#execinstr
  /// returns true  => .text
  virtual bool shouldOmitSectionDirective(StringRef SectionName) const;
 
  // Return true if a .align directive should use "optimized nops" to fill
  // instead of 0s.
  virtual bool useCodeAlign(const MCSection &Sec) const { return false; }
 
  bool usesSunStyleELFSectionSwitchSyntax() const {
    return SunStyleELFSectionSwitchSyntax;
  }
 
  bool usesELFSectionDirectiveForBSS() const {
    return UsesELFSectionDirectiveForBSS;
  }
 
  bool needsDwarfSectionOffsetDirective() const {
    return NeedsDwarfSectionOffsetDirective;
  }
 
  // Accessors.
 
  bool isAIX() const { return IsAIX; }
  bool isHLASM() const { return IsHLASM; }
  bool isMachO() const { return HasSubsectionsViaSymbols; }
  bool hasCOFFAssociativeComdats() const { return HasCOFFAssociativeComdats; }
  bool hasCOFFComdatConstants() const { return HasCOFFComdatConstants; }
 
  /// Returns the maximum possible encoded instruction size in bytes. If \p STI
  /// is null, this should be the maximum size for any subtarget.
  virtual unsigned getMaxInstLength(const MCSubtargetInfo *STI = nullptr) const {
    return MaxInstLength;
  }
 
  unsigned getMinInstAlignment() const { return MinInstAlignment; }
  bool getDollarIsPC() const { return DollarIsPC; }
  const char *getSeparatorString() const { return SeparatorString; }
 
  unsigned getCommentColumn() const { return CommentColumn; }
  void setCommentColumn(unsigned Col) { CommentColumn = Col; }
 
  StringRef getCommentString() const { return CommentString; }
  bool shouldAllowAdditionalComments() const { return AllowAdditionalComments; }
  const char *getLabelSuffix() const { return LabelSuffix; }
 
  bool usesSetToEquateSymbol() const { return UsesSetToEquateSymbol; }
  bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
  bool needsLocalForSize() const { return NeedsLocalForSize; }
  StringRef getInternalSymbolPrefix() const { return InternalSymbolPrefix; }
 
  bool hasLinkerPrivateGlobalPrefix() const {
    return !LinkerPrivateGlobalPrefix.empty();
  }
 
  StringRef getLinkerPrivateGlobalPrefix() const {
    if (hasLinkerPrivateGlobalPrefix())
      return LinkerPrivateGlobalPrefix;
    return getInternalSymbolPrefix();
  }
 
  const char *getInlineAsmStart() const { return InlineAsmStart; }
  const char *getInlineAsmEnd() const { return InlineAsmEnd; }
  unsigned getAssemblerDialect() const { return AssemblerDialect; }
  // Return the assembler dialect that output printing should use. Used by
  // createMCInstPrinter.
  unsigned getOutputAssemblerDialect() const {
    return TargetOptions.OutputAsmVariant.value_or(AssemblerDialect);
  }
  bool doesAllowAtInName() const { return AllowAtInName; }
  void setAllowAtInName(bool V) { AllowAtInName = V; }
  bool doesAllowQuestionAtStartOfIdentifier() const {
    return AllowQuestionAtStartOfIdentifier;
  }
  bool doesAllowAtAtStartOfIdentifier() const {
    return AllowAtAtStartOfIdentifier;
  }
  bool doesAllowDollarAtStartOfIdentifier() const {
    return AllowDollarAtStartOfIdentifier;
  }
  bool supportsNameQuoting() const { return SupportsQuotedNames; }
 
  bool doesSupportDataRegionDirectives() const {
    return UseDataRegionDirectives;
  }
 
  bool hasLEB128Directives() const { return HasLEB128Directives; }
 
  bool useFullRegisterNames() const { return PPCUseFullRegisterNames; }
  void setFullRegisterNames(bool V) { PPCUseFullRegisterNames = V; }
 
  const char *getZeroDirective() const { return ZeroDirective; }
  const char *getAsciiDirective() const { return AsciiDirective; }
  const char *getAscizDirective() const { return AscizDirective; }
  AsmCharLiteralSyntax characterLiteralSyntax() const {
    return CharacterLiteralSyntax;
  }
  bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
  unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
  const char *getGlobalDirective() const { return GlobalDirective; }
 
  bool doesSetDirectiveSuppressReloc() const {
    return SetDirectiveSuppressesReloc;
  }
 
  bool getCOMMDirectiveAlignmentIsInBytes() const {
    return COMMDirectiveAlignmentIsInBytes;
  }
 
  LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
    return LCOMMDirectiveAlignmentType;
  }
 
  bool hasFunctionAlignment() const { return HasFunctionAlignment; }
  bool hasPreferredAlignment() const { return HasPreferredAlignment; }
  bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
  bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
  bool hasIdentDirective() const { return HasIdentDirective; }
  bool hasNoDeadStrip() const { return HasNoDeadStrip; }
  const char *getWeakDirective() const { return WeakDirective; }
  const char *getWeakRefDirective() const { return WeakRefDirective; }
 
  bool hasWeakDefCanBeHiddenDirective() const {
    return HasWeakDefCanBeHiddenDirective;
  }
 
  bool avoidWeakIfComdat() const { return AvoidWeakIfComdat; }
 
  MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr; }
 
  MCSymbolAttr getExportedVisibilityAttr() const { return ExportedVisibilityAttr; }
 
  MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
    return HiddenDeclarationVisibilityAttr;
  }
 
  MCSymbolAttr getProtectedVisibilityAttr() const {
    return ProtectedVisibilityAttr;
  }
 
  bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
 
  WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
 
  bool usesCFIWithoutEH(ExceptionHandling EH) const {
    return EH == ExceptionHandling::None && UsesCFIWithoutEH;
  }
 
  /// Returns true if the exception handling method \p EH uses call frame
  /// information to unwind.
  bool usesCFIForEH(ExceptionHandling EH) const {
    return EH == ExceptionHandling::DwarfCFI || EH == ExceptionHandling::ARM ||
           EH == ExceptionHandling::ZOS ||
           (EH == ExceptionHandling::WinEH && usesWindowsCFI());
  }
 
  /// Returns true if the object format describes unwind information with
  /// Windows SEH unwind opcodes (.seh_* directives, .pdata and .xdata).
  /// Whether a function uses that encoding also depends on the exception
  /// model; see MachineFunction::usesWindowsUnwindInfo().
  bool usesWindowsCFI() const {
    return WinEHEncodingType != WinEH::EncodingType::Invalid &&
           WinEHEncodingType != WinEH::EncodingType::X86;
  }
 
  /// Returns true if the exception tables reference the per-invoke EH labels
  /// emitted around invokes. 32-bit x86 SEH and Wasm do not.
  bool usesPerInvokeEHLabels(ExceptionHandling EH) const {
    switch (EH) {
    case ExceptionHandling::WinEH:
      // 32-bit x86 SEH uses a state table, not per-invoke IP-to-state ranges.
      return WinEHEncodingType != WinEH::EncodingType::X86;
    case ExceptionHandling::None:
    case ExceptionHandling::Wasm:
      return false;
    default:
      return true;
    }
  }
 
  bool doesDwarfUseRelocationsAcrossSections() const {
    return DwarfUsesRelocationsAcrossSections;
  }
 
  bool doDwarfFDESymbolsUseAbsDiff() const { return DwarfFDESymbolsUseAbsDiff; }
  bool useDwarfRegNumForCFI() const { return DwarfRegNumForCFI; }
  bool useAtForSpecifier() const { return UseAtForSpecifier; }
  bool useParensForSpecifier() const { return UseParensForSpecifier; }
  bool supportsExtendedDwarfLocDirective() const {
    return SupportsExtendedDwarfLocDirective;
  }
 
  bool enableDwarfFileDirectoryDefault() const {
    return EnableDwarfFileDirectoryDefault;
  }
 
  void addInitialFrameState(const MCCFIInstruction &Inst);
 
  const std::vector<MCCFIInstruction> &getInitialFrameState() const {
    return InitialFrameState;
  }
 
  void setBinutilsVersion(std::pair<int, int> Value) {
    BinutilsVersion = Value;
  }
 
  /// Return true if assembly (inline or otherwise) should be parsed.
  bool useIntegratedAssembler() const { return UseIntegratedAssembler; }
 
  /// Return true if target want to use AsmParser to parse inlineasm.
  bool parseInlineAsmUsingAsmParser() const {
    return ParseInlineAsmUsingAsmParser;
  }
 
  bool binutilsIsAtLeast(int Major, int Minor) const {
    return BinutilsVersion >= std::make_pair(Major, Minor);
  }
 
  /// Set whether assembly (inline or otherwise) should be parsed.
  virtual void setUseIntegratedAssembler(bool Value) {
    UseIntegratedAssembler = Value;
  }
 
  /// Set whether target want to use AsmParser to parse inlineasm.
  void setParseInlineAsmUsingAsmParser(bool Value) {
    ParseInlineAsmUsingAsmParser = Value;
  }
 
  /// Return true if assembly (inline or otherwise) should be parsed.
  bool preserveAsmComments() const { return PreserveAsmComments; }
 
  /// Set whether assembly (inline or otherwise) should be parsed.
  void setPreserveAsmComments(bool Value) { PreserveAsmComments = Value; }
 
  bool shouldUseLogicalShr() const { return UseLogicalShr; }
 
  bool shouldUseMotorolaIntegers() const { return UseMotorolaIntegers; }
 
  StringRef getSpecifierName(uint32_t S) const;
  std::optional<uint32_t> getSpecifierForName(StringRef Name) const;
 
  void printExpr(raw_ostream &, const MCExpr &) const;
  virtual void printSpecifierExpr(raw_ostream &,
                                  const MCSpecifierExpr &) const {
    llvm_unreachable("Need to implement hook if target uses MCSpecifierExpr");
  }
  virtual bool evaluateAsRelocatableImpl(const MCSpecifierExpr &, MCValue &Res,
                                         const MCAssembler *Asm) const;
};
 
} // end namespace llvm
 
#endif // LLVM_MC_MCASMINFO_H