Home | History | Annotate | Download | only in MC 
      1 //===-- llvm/MC/MCAsmInfo.h - Asm info --------------------------*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file contains a class to be used as the basis for target specific
     11 // asm writers.  This class primarily takes care of global printing constants,
     12 // which are used in very similar ways across all targets.
     13 //
     14 //===----------------------------------------------------------------------===//
     15 
     16 #ifndef LLVM_MC_MCASMINFO_H
     17 #define LLVM_MC_MCASMINFO_H
     18 
     19 #include "llvm/ADT/StringRef.h"
     20 #include "llvm/MC/MCDirectives.h"
     21 #include "llvm/MC/MCDwarf.h"
     22 #include "llvm/MC/MCTargetOptions.h"
     23 #include <vector>
     24 
     25 namespace llvm {
     26 
     27 class MCContext;
     28 class MCExpr;
     29 class MCSection;
     30 class MCStreamer;
     31 class MCSymbol;
     32 
     33 namespace WinEH {
     34 
     35 enum class EncodingType {
     36   Invalid, /// Invalid
     37   Alpha,   /// Windows Alpha
     38   Alpha64, /// Windows AXP64
     39   ARM,     /// Windows NT (Windows on ARM)
     40   CE,      /// Windows CE ARM, PowerPC, SH3, SH4
     41   Itanium, /// Windows x64, Windows Itanium (IA-64)
     42   X86,     /// Windows x86, uses no CFI, just EH tables
     43   MIPS = Alpha,
     44 };
     45 
     46 } // end namespace WinEH
     47 
     48 namespace LCOMM {
     49 
     50 enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
     51 
     52 } // end namespace LCOMM
     53 
     54 enum class DebugCompressionType {
     55   DCT_None,    // no compression
     56   DCT_Zlib,    // zlib style complession
     57   DCT_ZlibGnu  // zlib-gnu style compression
     58 };
     59 
     60 /// This class is intended to be used as a base class for asm
     61 /// properties and features specific to the target.
     62 class MCAsmInfo {
     63 protected:
     64   //===------------------------------------------------------------------===//
     65   // Properties to be set by the target writer, used to configure asm printer.
     66   //
     67 
     68   /// Pointer size in bytes.  Default is 4.
     69   unsigned PointerSize = 4;
     70 
     71   /// Size of the stack slot reserved for callee-saved registers, in bytes.
     72   /// Default is same as pointer size.
     73   unsigned CalleeSaveStackSlotSize = 4;
     74 
     75   /// True if target is little endian.  Default is true.
     76   bool IsLittleEndian = true;
     77 
     78   /// True if target stack grow up.  Default is false.
     79   bool StackGrowsUp = false;
     80 
     81   /// True if this target has the MachO .subsections_via_symbols directive.
     82   /// Default is false.
     83   bool HasSubsectionsViaSymbols = false;
     84 
     85   /// True if this is a MachO target that supports the macho-specific .zerofill
     86   /// directive for emitting BSS Symbols.  Default is false.
     87   bool HasMachoZeroFillDirective = false;
     88 
     89   /// True if this is a MachO target that supports the macho-specific .tbss
     90   /// directive for emitting thread local BSS Symbols.  Default is false.
     91   bool HasMachoTBSSDirective = false;
     92 
     93   /// This is the maximum possible length of an instruction, which is needed to
     94   /// compute the size of an inline asm.  Defaults to 4.
     95   unsigned MaxInstLength = 4;
     96 
     97   /// Every possible instruction length is a multiple of this value.  Factored
     98   /// out in .debug_frame and .debug_line.  Defaults to 1.
     99   unsigned MinInstAlignment = 1;
    100 
    101   /// The '$' token, when not referencing an identifier or constant, refers to
    102   /// the current PC.  Defaults to false.
    103   bool DollarIsPC = false;
    104 
    105   /// This string, if specified, is used to separate instructions from each
    106   /// other when on the same line.  Defaults to ';'
    107   const char *SeparatorString;
    108 
    109   /// This indicates the comment character used by the assembler.  Defaults to
    110   /// "#"
    111   StringRef CommentString;
    112 
    113   /// This is appended to emitted labels.  Defaults to ":"
    114   const char *LabelSuffix;
    115 
    116   // Print the EH begin symbol with an assignment. Defaults to false.
    117   bool UseAssignmentForEHBegin = false;
    118 
    119   // Do we need to create a local symbol for .size?
    120   bool NeedsLocalForSize = false;
    121 
    122   /// This prefix is used for globals like constant pool entries that are
    123   /// completely private to the .s file and should not have names in the .o
    124   /// file.  Defaults to "L"
    125   StringRef PrivateGlobalPrefix;
    126 
    127   /// This prefix is used for labels for basic blocks. Defaults to the same as
    128   /// PrivateGlobalPrefix.
    129   StringRef PrivateLabelPrefix;
    130 
    131   /// This prefix is used for symbols that should be passed through the
    132   /// assembler but be removed by the linker.  This is 'l' on Darwin, currently
    133   /// used for some ObjC metadata.  The default of "" meast that for this system
    134   /// a plain private symbol should be used.  Defaults to "".
    135   StringRef LinkerPrivateGlobalPrefix;
    136 
    137   /// If these are nonempty, they contain a directive to emit before and after
    138   /// an inline assembly statement.  Defaults to "#APP\n", "#NO_APP\n"
    139   const char *InlineAsmStart;
    140   const char *InlineAsmEnd;
    141 
    142   /// These are assembly directives that tells the assembler to interpret the
    143   /// following instructions differently.  Defaults to ".code16", ".code32",
    144   /// ".code64".
    145   const char *Code16Directive;
    146   const char *Code32Directive;
    147   const char *Code64Directive;
    148 
    149   /// Which dialect of an assembler variant to use.  Defaults to 0
    150   unsigned AssemblerDialect = 0;
    151 
    152   /// This is true if the assembler allows @ characters in symbol names.
    153   /// Defaults to false.
    154   bool AllowAtInName = false;
    155 
    156   /// If this is true, symbol names with invalid characters will be printed in
    157   /// quotes.
    158   bool SupportsQuotedNames = true;
    159 
    160   /// This is true if data region markers should be printed as
    161   /// ".data_region/.end_data_region" directives. If false, use "$d/$a" labels
    162   /// instead.
    163   bool UseDataRegionDirectives = false;
    164 
    165   //===--- Data Emission Directives -------------------------------------===//
    166 
    167   /// This should be set to the directive used to get some number of zero bytes
    168   /// emitted to the current section.  Common cases are "\t.zero\t" and
    169   /// "\t.space\t".  If this is set to null, the Data*bitsDirective's will be
    170   /// used to emit zero bytes.  Defaults to "\t.zero\t"
    171   const char *ZeroDirective;
    172 
    173   /// This directive allows emission of an ascii string with the standard C
    174   /// escape characters embedded into it.  Defaults to "\t.ascii\t"
    175   const char *AsciiDirective;
    176 
    177   /// If not null, this allows for special handling of zero terminated strings
    178   /// on this target.  This is commonly supported as ".asciz".  If a target
    179   /// doesn't support this, it can be set to null.  Defaults to "\t.asciz\t"
    180   const char *AscizDirective;
    181 
    182   /// These directives are used to output some unit of integer data to the
    183   /// current section.  If a data directive is set to null, smaller data
    184   /// directives will be used to emit the large sizes.  Defaults to "\t.byte\t",
    185   /// "\t.short\t", "\t.long\t", "\t.quad\t"
    186   const char *Data8bitsDirective;
    187   const char *Data16bitsDirective;
    188   const char *Data32bitsDirective;
    189   const char *Data64bitsDirective;
    190 
    191   /// If non-null, a directive that is used to emit a word which should be
    192   /// relocated as a 64-bit GP-relative offset, e.g. .gpdword on Mips.  Defaults
    193   /// to nullptr.
    194   const char *GPRel64Directive = nullptr;
    195 
    196   /// If non-null, a directive that is used to emit a word which should be
    197   /// relocated as a 32-bit GP-relative offset, e.g. .gpword on Mips or .gprel32
    198   /// on Alpha.  Defaults to nullptr.
    199   const char *GPRel32Directive = nullptr;
    200 
    201   /// If non-null, directives that are used to emit a word/dword which should
    202   /// be relocated as a 32/64-bit DTP/TP-relative offset, e.g. .dtprelword/
    203   /// .dtpreldword/.tprelword/.tpreldword on Mips.
    204   const char *DTPRel32Directive = nullptr;
    205   const char *DTPRel64Directive = nullptr;
    206   const char *TPRel32Directive = nullptr;
    207   const char *TPRel64Directive = nullptr;
    208 
    209   /// This is true if this target uses "Sun Style" syntax for section switching
    210   /// ("#alloc,#write" etc) instead of the normal ELF syntax (,"a,w") in
    211   /// .section directives.  Defaults to false.
    212   bool SunStyleELFSectionSwitchSyntax = false;
    213 
    214   /// This is true if this target uses ELF '.section' directive before the
    215   /// '.bss' one. It's used for PPC/Linux which doesn't support the '.bss'
    216   /// directive only.  Defaults to false.
    217   bool UsesELFSectionDirectiveForBSS = false;
    218 
    219   bool NeedsDwarfSectionOffsetDirective = false;
    220 
    221   //===--- Alignment Information ----------------------------------------===//
    222 
    223   /// If this is true (the default) then the asmprinter emits ".align N"
    224   /// directives, where N is the number of bytes to align to.  Otherwise, it
    225   /// emits ".align log2(N)", e.g. 3 to align to an 8 byte boundary.  Defaults
    226   /// to true.
    227   bool AlignmentIsInBytes = true;
    228 
    229   /// If non-zero, this is used to fill the executable space created as the
    230   /// result of a alignment directive.  Defaults to 0
    231   unsigned TextAlignFillValue = 0;
    232 
    233   //===--- Global Variable Emission Directives --------------------------===//
    234 
    235   /// This is the directive used to declare a global entity. Defaults to
    236   /// ".globl".
    237   const char *GlobalDirective;
    238 
    239   /// True if the expression
    240   ///   .long f - g
    241   /// uses a relocation but it can be suppressed by writing
    242   ///   a = f - g
    243   ///   .long a
    244   bool SetDirectiveSuppressesReloc = false;
    245 
    246   /// False if the assembler requires that we use
    247   /// \code
    248   ///   Lc = a - b
    249   ///   .long Lc
    250   /// \endcode
    251   //
    252   /// instead of
    253   //
    254   /// \code
    255   ///   .long a - b
    256   /// \endcode
    257   ///
    258   ///  Defaults to true.
    259   bool HasAggressiveSymbolFolding = true;
    260 
    261   /// True is .comm's and .lcomms optional alignment is to be specified in bytes
    262   /// instead of log2(n).  Defaults to true.
    263   bool COMMDirectiveAlignmentIsInBytes = true;
    264 
    265   /// Describes if the .lcomm directive for the target supports an alignment
    266   /// argument and how it is interpreted.  Defaults to NoAlignment.
    267   LCOMM::LCOMMType LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
    268 
    269   // True if the target allows .align directives on functions. This is true for
    270   // most targets, so defaults to true.
    271   bool HasFunctionAlignment = true;
    272 
    273   /// True if the target has .type and .size directives, this is true for most
    274   /// ELF targets.  Defaults to true.
    275   bool HasDotTypeDotSizeDirective = true;
    276 
    277   /// True if the target has a single parameter .file directive, this is true
    278   /// for ELF targets.  Defaults to true.
    279   bool HasSingleParameterDotFile = true;
    280 
    281   /// True if the target has a .ident directive, this is true for ELF targets.
    282   /// Defaults to false.
    283   bool HasIdentDirective = false;
    284 
    285   /// True if this target supports the MachO .no_dead_strip directive.  Defaults
    286   /// to false.
    287   bool HasNoDeadStrip = false;
    288 
    289   /// True if this target supports the MachO .alt_entry directive.  Defaults to
    290   /// false.
    291   bool HasAltEntry = false;
    292 
    293   /// Used to declare a global as being a weak symbol. Defaults to ".weak".
    294   const char *WeakDirective;
    295 
    296   /// This directive, if non-null, is used to declare a global as being a weak
    297   /// undefined symbol.  Defaults to nullptr.
    298   const char *WeakRefDirective = nullptr;
    299 
    300   /// True if we have a directive to declare a global as being a weak defined
    301   /// symbol.  Defaults to false.
    302   bool HasWeakDefDirective = false;
    303 
    304   /// True if we have a directive to declare a global as being a weak defined
    305   /// symbol that can be hidden (unexported).  Defaults to false.
    306   bool HasWeakDefCanBeHiddenDirective = false;
    307 
    308   /// True if we have a .linkonce directive.  This is used on cygwin/mingw.
    309   /// Defaults to false.
    310   bool HasLinkOnceDirective = false;
    311 
    312   /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
    313   /// hidden visibility.  Defaults to MCSA_Hidden.
    314   MCSymbolAttr HiddenVisibilityAttr = MCSA_Hidden;
    315 
    316   /// This attribute, if not MCSA_Invalid, is used to declare an undefined
    317   /// symbol as having hidden visibility. Defaults to MCSA_Hidden.
    318   MCSymbolAttr HiddenDeclarationVisibilityAttr = MCSA_Hidden;
    319 
    320   /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
    321   /// protected visibility.  Defaults to MCSA_Protected
    322   MCSymbolAttr ProtectedVisibilityAttr = MCSA_Protected;
    323 
    324   //===--- Dwarf Emission Directives -----------------------------------===//
    325 
    326   /// True if target supports emission of debugging information.  Defaults to
    327   /// false.
    328   bool SupportsDebugInformation = false;
    329 
    330   /// Exception handling format for the target.  Defaults to None.
    331   ExceptionHandling ExceptionsType = ExceptionHandling::None;
    332 
    333   /// Windows exception handling data (.pdata) encoding.  Defaults to Invalid.
    334   WinEH::EncodingType WinEHEncodingType = WinEH::EncodingType::Invalid;
    335 
    336   /// True if Dwarf2 output generally uses relocations for references to other
    337   /// .debug_* sections.
    338   bool DwarfUsesRelocationsAcrossSections = true;
    339 
    340   /// True if DWARF FDE symbol reference relocations should be replaced by an
    341   /// absolute difference.
    342   bool DwarfFDESymbolsUseAbsDiff = false;
    343 
    344   /// True if dwarf register numbers are printed instead of symbolic register
    345   /// names in .cfi_* directives.  Defaults to false.
    346   bool DwarfRegNumForCFI = false;
    347 
    348   /// True if target uses parens to indicate the symbol variant instead of @.
    349   /// For example, foo(plt) instead of foo@plt.  Defaults to false.
    350   bool UseParensForSymbolVariant = false;
    351 
    352   //===--- Prologue State ----------------------------------------------===//
    353 
    354   std::vector<MCCFIInstruction> InitialFrameState;
    355 
    356   //===--- Integrated Assembler Information ----------------------------===//
    357 
    358   /// Should we use the integrated assembler?
    359   /// The integrated assembler should be enabled by default (by the
    360   /// constructors) when failing to parse a valid piece of assembly (inline
    361   /// or otherwise) is considered a bug. It may then be overridden after
    362   /// construction (see LLVMTargetMachine::initAsmInfo()).
    363   bool UseIntegratedAssembler;
    364 
    365   /// Preserve Comments in assembly
    366   bool PreserveAsmComments;
    367 
    368   /// Compress DWARF debug sections. Defaults to no compression.
    369   DebugCompressionType CompressDebugSections = DebugCompressionType::DCT_None;
    370 
    371   /// True if the integrated assembler should interpret 'a >> b' constant
    372   /// expressions as logical rather than arithmetic.
    373   bool UseLogicalShr = true;
    374 
    375   // If true, emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL, on
    376   // X86_64 ELF.
    377   bool RelaxELFRelocations = true;
    378 
    379   // If true, then the lexer and expression parser will support %neg(),
    380   // %hi(), and similar unary operators.
    381   bool HasMipsExpressions = false;
    382 
    383 public:
    384   explicit MCAsmInfo();
    385   virtual ~MCAsmInfo();
    386 
    387   /// Get the pointer size in bytes.
    388   unsigned getPointerSize() const { return PointerSize; }
    389 
    390   /// Get the callee-saved register stack slot
    391   /// size in bytes.
    392   unsigned getCalleeSaveStackSlotSize() const {
    393     return CalleeSaveStackSlotSize;
    394   }
    395 
    396   /// True if the target is little endian.
    397   bool isLittleEndian() const { return IsLittleEndian; }
    398 
    399   /// True if target stack grow up.
    400   bool isStackGrowthDirectionUp() const { return StackGrowsUp; }
    401 
    402   bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
    403 
    404   // Data directive accessors.
    405 
    406   const char *getData8bitsDirective() const { return Data8bitsDirective; }
    407   const char *getData16bitsDirective() const { return Data16bitsDirective; }
    408   const char *getData32bitsDirective() const { return Data32bitsDirective; }
    409   const char *getData64bitsDirective() const { return Data64bitsDirective; }
    410   const char *getGPRel64Directive() const { return GPRel64Directive; }
    411   const char *getGPRel32Directive() const { return GPRel32Directive; }
    412   const char *getDTPRel64Directive() const { return DTPRel64Directive; }
    413   const char *getDTPRel32Directive() const { return DTPRel32Directive; }
    414   const char *getTPRel64Directive() const { return TPRel64Directive; }
    415   const char *getTPRel32Directive() const { return TPRel32Directive; }
    416 
    417   /// Targets can implement this method to specify a section to switch to if the
    418   /// translation unit doesn't have any trampolines that require an executable
    419   /// stack.
    420   virtual MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
    421     return nullptr;
    422   }
    423 
    424   /// \brief True if the section is atomized using the symbols in it.
    425   /// This is false if the section is not atomized at all (most ELF sections) or
    426   /// if it is atomized based on its contents (MachO' __TEXT,__cstring for
    427   /// example).
    428   virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
    429 
    430   virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
    431                                                     unsigned Encoding,
    432                                                     MCStreamer &Streamer) const;
    433 
    434   virtual const MCExpr *getExprForFDESymbol(const MCSymbol *Sym,
    435                                             unsigned Encoding,
    436                                             MCStreamer &Streamer) const;
    437 
    438   /// Return true if the identifier \p Name does not need quotes to be
    439   /// syntactically correct.
    440   virtual bool isValidUnquotedName(StringRef Name) const;
    441 
    442   /// Return true if the .section directive should be omitted when
    443   /// emitting \p SectionName.  For example:
    444   ///
    445   /// shouldOmitSectionDirective(".text")
    446   ///
    447   /// returns false => .section .text,#alloc,#execinstr
    448   /// returns true  => .text
    449   virtual bool shouldOmitSectionDirective(StringRef SectionName) const;
    450 
    451   bool usesSunStyleELFSectionSwitchSyntax() const {
    452     return SunStyleELFSectionSwitchSyntax;
    453   }
    454 
    455   bool usesELFSectionDirectiveForBSS() const {
    456     return UsesELFSectionDirectiveForBSS;
    457   }
    458 
    459   bool needsDwarfSectionOffsetDirective() const {
    460     return NeedsDwarfSectionOffsetDirective;
    461   }
    462 
    463   // Accessors.
    464 
    465   bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
    466   bool hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
    467   unsigned getMaxInstLength() const { return MaxInstLength; }
    468   unsigned getMinInstAlignment() const { return MinInstAlignment; }
    469   bool getDollarIsPC() const { return DollarIsPC; }
    470   const char *getSeparatorString() const { return SeparatorString; }
    471 
    472   /// This indicates the column (zero-based) at which asm comments should be
    473   /// printed.
    474   unsigned getCommentColumn() const { return 40; }
    475 
    476   StringRef getCommentString() const { return CommentString; }
    477   const char *getLabelSuffix() const { return LabelSuffix; }
    478 
    479   bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
    480   bool needsLocalForSize() const { return NeedsLocalForSize; }
    481   StringRef getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
    482   StringRef getPrivateLabelPrefix() const { return PrivateLabelPrefix; }
    483 
    484   bool hasLinkerPrivateGlobalPrefix() const {
    485     return LinkerPrivateGlobalPrefix[0] != '\0';
    486   }
    487 
    488   StringRef getLinkerPrivateGlobalPrefix() const {
    489     if (hasLinkerPrivateGlobalPrefix())
    490       return LinkerPrivateGlobalPrefix;
    491     return getPrivateGlobalPrefix();
    492   }
    493 
    494   const char *getInlineAsmStart() const { return InlineAsmStart; }
    495   const char *getInlineAsmEnd() const { return InlineAsmEnd; }
    496   const char *getCode16Directive() const { return Code16Directive; }
    497   const char *getCode32Directive() const { return Code32Directive; }
    498   const char *getCode64Directive() const { return Code64Directive; }
    499   unsigned getAssemblerDialect() const { return AssemblerDialect; }
    500   bool doesAllowAtInName() const { return AllowAtInName; }
    501   bool supportsNameQuoting() const { return SupportsQuotedNames; }
    502 
    503   bool doesSupportDataRegionDirectives() const {
    504     return UseDataRegionDirectives;
    505   }
    506 
    507   const char *getZeroDirective() const { return ZeroDirective; }
    508   const char *getAsciiDirective() const { return AsciiDirective; }
    509   const char *getAscizDirective() const { return AscizDirective; }
    510   bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
    511   unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
    512   const char *getGlobalDirective() const { return GlobalDirective; }
    513 
    514   bool doesSetDirectiveSuppressReloc() const {
    515     return SetDirectiveSuppressesReloc;
    516   }
    517 
    518   bool hasAggressiveSymbolFolding() const { return HasAggressiveSymbolFolding; }
    519 
    520   bool getCOMMDirectiveAlignmentIsInBytes() const {
    521     return COMMDirectiveAlignmentIsInBytes;
    522   }
    523 
    524   LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
    525     return LCOMMDirectiveAlignmentType;
    526   }
    527 
    528   bool hasFunctionAlignment() const { return HasFunctionAlignment; }
    529   bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
    530   bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
    531   bool hasIdentDirective() const { return HasIdentDirective; }
    532   bool hasNoDeadStrip() const { return HasNoDeadStrip; }
    533   bool hasAltEntry() const { return HasAltEntry; }
    534   const char *getWeakDirective() const { return WeakDirective; }
    535   const char *getWeakRefDirective() const { return WeakRefDirective; }
    536   bool hasWeakDefDirective() const { return HasWeakDefDirective; }
    537 
    538   bool hasWeakDefCanBeHiddenDirective() const {
    539     return HasWeakDefCanBeHiddenDirective;
    540   }
    541 
    542   bool hasLinkOnceDirective() const { return HasLinkOnceDirective; }
    543 
    544   MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr; }
    545 
    546   MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
    547     return HiddenDeclarationVisibilityAttr;
    548   }
    549 
    550   MCSymbolAttr getProtectedVisibilityAttr() const {
    551     return ProtectedVisibilityAttr;
    552   }
    553 
    554   bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
    555 
    556   bool doesSupportExceptionHandling() const {
    557     return ExceptionsType != ExceptionHandling::None;
    558   }
    559 
    560   ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
    561   WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
    562 
    563   void setExceptionsType(ExceptionHandling EH) {
    564     ExceptionsType = EH;
    565   }
    566 
    567   /// Returns true if the exception handling method for the platform uses call
    568   /// frame information to unwind.
    569   bool usesCFIForEH() const {
    570     return (ExceptionsType == ExceptionHandling::DwarfCFI ||
    571             ExceptionsType == ExceptionHandling::ARM || usesWindowsCFI());
    572   }
    573 
    574   bool usesWindowsCFI() const {
    575     return ExceptionsType == ExceptionHandling::WinEH &&
    576            (WinEHEncodingType != WinEH::EncodingType::Invalid &&
    577             WinEHEncodingType != WinEH::EncodingType::X86);
    578   }
    579 
    580   bool doesDwarfUseRelocationsAcrossSections() const {
    581     return DwarfUsesRelocationsAcrossSections;
    582   }
    583 
    584   bool doDwarfFDESymbolsUseAbsDiff() const { return DwarfFDESymbolsUseAbsDiff; }
    585   bool useDwarfRegNumForCFI() const { return DwarfRegNumForCFI; }
    586   bool useParensForSymbolVariant() const { return UseParensForSymbolVariant; }
    587 
    588   void addInitialFrameState(const MCCFIInstruction &Inst) {
    589     InitialFrameState.push_back(Inst);
    590   }
    591 
    592   const std::vector<MCCFIInstruction> &getInitialFrameState() const {
    593     return InitialFrameState;
    594   }
    595 
    596   /// Return true if assembly (inline or otherwise) should be parsed.
    597   bool useIntegratedAssembler() const { return UseIntegratedAssembler; }
    598 
    599   /// Set whether assembly (inline or otherwise) should be parsed.
    600   virtual void setUseIntegratedAssembler(bool Value) {
    601     UseIntegratedAssembler = Value;
    602   }
    603 
    604   /// Return true if assembly (inline or otherwise) should be parsed.
    605   bool preserveAsmComments() const { return PreserveAsmComments; }
    606 
    607   /// Set whether assembly (inline or otherwise) should be parsed.
    608   virtual void setPreserveAsmComments(bool Value) {
    609     PreserveAsmComments = Value;
    610   }
    611 
    612   DebugCompressionType compressDebugSections() const {
    613     return CompressDebugSections;
    614   }
    615 
    616   void setCompressDebugSections(DebugCompressionType CompressDebugSections) {
    617     this->CompressDebugSections = CompressDebugSections;
    618   }
    619 
    620   bool shouldUseLogicalShr() const { return UseLogicalShr; }
    621 
    622   bool canRelaxRelocations() const { return RelaxELFRelocations; }
    623   void setRelaxELFRelocations(bool V) { RelaxELFRelocations = V; }
    624   bool hasMipsExpressions() const { return HasMipsExpressions; }
    625 };
    626 
    627 } // end namespace llvm
    628 
    629 #endif // LLVM_MC_MCASMINFO_H
    630