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 /// This class is intended to be used as a base class for asm
     55 /// properties and features specific to the target.
     56 class MCAsmInfo {
     57 protected:
     58   //===------------------------------------------------------------------===//
     59   // Properties to be set by the target writer, used to configure asm printer.
     60   //
     61 
     62   /// Code pointer size in bytes.  Default is 4.
     63   unsigned CodePointerSize = 4;
     64 
     65   /// Size of the stack slot reserved for callee-saved registers, in bytes.
     66   /// Default is same as pointer size.
     67   unsigned CalleeSaveStackSlotSize = 4;
     68 
     69   /// True if target is little endian.  Default is true.
     70   bool IsLittleEndian = true;
     71 
     72   /// True if target stack grow up.  Default is false.
     73   bool StackGrowsUp = false;
     74 
     75   /// True if this target has the MachO .subsections_via_symbols directive.
     76   /// Default is false.
     77   bool HasSubsectionsViaSymbols = false;
     78 
     79   /// True if this is a MachO target that supports the macho-specific .zerofill
     80   /// directive for emitting BSS Symbols.  Default is false.
     81   bool HasMachoZeroFillDirective = false;
     82 
     83   /// True if this is a MachO target that supports the macho-specific .tbss
     84   /// directive for emitting thread local BSS Symbols.  Default is false.
     85   bool HasMachoTBSSDirective = false;
     86 
     87   /// True if this is a non-GNU COFF target. The COFF port of the GNU linker
     88   /// doesn't handle associative comdats in the way that we would like to use
     89   /// them.
     90   bool HasCOFFAssociativeComdats = false;
     91 
     92   /// True if this is a non-GNU COFF target. For GNU targets, we don't generate
     93   /// constants into comdat sections.
     94   bool HasCOFFComdatConstants = false;
     95 
     96   /// This is the maximum possible length of an instruction, which is needed to
     97   /// compute the size of an inline asm.  Defaults to 4.
     98   unsigned MaxInstLength = 4;
     99 
    100   /// Every possible instruction length is a multiple of this value.  Factored
    101   /// out in .debug_frame and .debug_line.  Defaults to 1.
    102   unsigned MinInstAlignment = 1;
    103 
    104   /// The '$' token, when not referencing an identifier or constant, refers to
    105   /// the current PC.  Defaults to false.
    106   bool DollarIsPC = false;
    107 
    108   /// This string, if specified, is used to separate instructions from each
    109   /// other when on the same line.  Defaults to ';'
    110   const char *SeparatorString;
    111 
    112   /// This indicates the comment character used by the assembler.  Defaults to
    113   /// "#"
    114   StringRef CommentString;
    115 
    116   /// This is appended to emitted labels.  Defaults to ":"
    117   const char *LabelSuffix;
    118 
    119   // Print the EH begin symbol with an assignment. Defaults to false.
    120   bool UseAssignmentForEHBegin = false;
    121 
    122   // Do we need to create a local symbol for .size?
    123   bool NeedsLocalForSize = false;
    124 
    125   /// This prefix is used for globals like constant pool entries that are
    126   /// completely private to the .s file and should not have names in the .o
    127   /// file.  Defaults to "L"
    128   StringRef PrivateGlobalPrefix;
    129 
    130   /// This prefix is used for labels for basic blocks. Defaults to the same as
    131   /// PrivateGlobalPrefix.
    132   StringRef PrivateLabelPrefix;
    133 
    134   /// This prefix is used for symbols that should be passed through the
    135   /// assembler but be removed by the linker.  This is 'l' on Darwin, currently
    136   /// used for some ObjC metadata.  The default of "" meast that for this system
    137   /// a plain private symbol should be used.  Defaults to "".
    138   StringRef LinkerPrivateGlobalPrefix;
    139 
    140   /// If these are nonempty, they contain a directive to emit before and after
    141   /// an inline assembly statement.  Defaults to "#APP\n", "#NO_APP\n"
    142   const char *InlineAsmStart;
    143   const char *InlineAsmEnd;
    144 
    145   /// These are assembly directives that tells the assembler to interpret the
    146   /// following instructions differently.  Defaults to ".code16", ".code32",
    147   /// ".code64".
    148   const char *Code16Directive;
    149   const char *Code32Directive;
    150   const char *Code64Directive;
    151 
    152   /// Which dialect of an assembler variant to use.  Defaults to 0
    153   unsigned AssemblerDialect = 0;
    154 
    155   /// This is true if the assembler allows @ characters in symbol names.
    156   /// Defaults to false.
    157   bool AllowAtInName = false;
    158 
    159   /// If this is true, symbol names with invalid characters will be printed in
    160   /// quotes.
    161   bool SupportsQuotedNames = true;
    162 
    163   /// This is true if data region markers should be printed as
    164   /// ".data_region/.end_data_region" directives. If false, use "$d/$a" labels
    165   /// instead.
    166   bool UseDataRegionDirectives = false;
    167 
    168   //===--- Data Emission Directives -------------------------------------===//
    169 
    170   /// This should be set to the directive used to get some number of zero bytes
    171   /// emitted to the current section.  Common cases are "\t.zero\t" and
    172   /// "\t.space\t".  If this is set to null, the Data*bitsDirective's will be
    173   /// used to emit zero bytes.  Defaults to "\t.zero\t"
    174   const char *ZeroDirective;
    175 
    176   /// This directive allows emission of an ascii string with the standard C
    177   /// escape characters embedded into it.  If a target doesn't support this, it
    178   /// can be set to null. Defaults to "\t.ascii\t"
    179   const char *AsciiDirective;
    180 
    181   /// If not null, this allows for special handling of zero terminated strings
    182   /// on this target.  This is commonly supported as ".asciz".  If a target
    183   /// doesn't support this, it can be set to null.  Defaults to "\t.asciz\t"
    184   const char *AscizDirective;
    185 
    186   /// These directives are used to output some unit of integer data to the
    187   /// current section.  If a data directive is set to null, smaller data
    188   /// directives will be used to emit the large sizes.  Defaults to "\t.byte\t",
    189   /// "\t.short\t", "\t.long\t", "\t.quad\t"
    190   const char *Data8bitsDirective;
    191   const char *Data16bitsDirective;
    192   const char *Data32bitsDirective;
    193   const char *Data64bitsDirective;
    194 
    195   /// If non-null, a directive that is used to emit a word which should be
    196   /// relocated as a 64-bit GP-relative offset, e.g. .gpdword on Mips.  Defaults
    197   /// to nullptr.
    198   const char *GPRel64Directive = nullptr;
    199 
    200   /// If non-null, a directive that is used to emit a word which should be
    201   /// relocated as a 32-bit GP-relative offset, e.g. .gpword on Mips or .gprel32
    202   /// on Alpha.  Defaults to nullptr.
    203   const char *GPRel32Directive = nullptr;
    204 
    205   /// If non-null, directives that are used to emit a word/dword which should
    206   /// be relocated as a 32/64-bit DTP/TP-relative offset, e.g. .dtprelword/
    207   /// .dtpreldword/.tprelword/.tpreldword on Mips.
    208   const char *DTPRel32Directive = nullptr;
    209   const char *DTPRel64Directive = nullptr;
    210   const char *TPRel32Directive = nullptr;
    211   const char *TPRel64Directive = nullptr;
    212 
    213   /// This is true if this target uses "Sun Style" syntax for section switching
    214   /// ("#alloc,#write" etc) instead of the normal ELF syntax (,"a,w") in
    215   /// .section directives.  Defaults to false.
    216   bool SunStyleELFSectionSwitchSyntax = false;
    217 
    218   /// This is true if this target uses ELF '.section' directive before the
    219   /// '.bss' one. It's used for PPC/Linux which doesn't support the '.bss'
    220   /// directive only.  Defaults to false.
    221   bool UsesELFSectionDirectiveForBSS = false;
    222 
    223   bool NeedsDwarfSectionOffsetDirective = false;
    224 
    225   //===--- Alignment Information ----------------------------------------===//
    226 
    227   /// If this is true (the default) then the asmprinter emits ".align N"
    228   /// directives, where N is the number of bytes to align to.  Otherwise, it
    229   /// emits ".align log2(N)", e.g. 3 to align to an 8 byte boundary.  Defaults
    230   /// to true.
    231   bool AlignmentIsInBytes = true;
    232 
    233   /// If non-zero, this is used to fill the executable space created as the
    234   /// result of a alignment directive.  Defaults to 0
    235   unsigned TextAlignFillValue = 0;
    236 
    237   //===--- Global Variable Emission Directives --------------------------===//
    238 
    239   /// This is the directive used to declare a global entity. Defaults to
    240   /// ".globl".
    241   const char *GlobalDirective;
    242 
    243   /// True if the expression
    244   ///   .long f - g
    245   /// uses a relocation but it can be suppressed by writing
    246   ///   a = f - g
    247   ///   .long a
    248   bool SetDirectiveSuppressesReloc = false;
    249 
    250   /// False if the assembler requires that we use
    251   /// \code
    252   ///   Lc = a - b
    253   ///   .long Lc
    254   /// \endcode
    255   //
    256   /// instead of
    257   //
    258   /// \code
    259   ///   .long a - b
    260   /// \endcode
    261   ///
    262   ///  Defaults to true.
    263   bool HasAggressiveSymbolFolding = true;
    264 
    265   /// True is .comm's and .lcomms optional alignment is to be specified in bytes
    266   /// instead of log2(n).  Defaults to true.
    267   bool COMMDirectiveAlignmentIsInBytes = true;
    268 
    269   /// Describes if the .lcomm directive for the target supports an alignment
    270   /// argument and how it is interpreted.  Defaults to NoAlignment.
    271   LCOMM::LCOMMType LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
    272 
    273   // True if the target allows .align directives on functions. This is true for
    274   // most targets, so defaults to true.
    275   bool HasFunctionAlignment = true;
    276 
    277   /// True if the target has .type and .size directives, this is true for most
    278   /// ELF targets.  Defaults to true.
    279   bool HasDotTypeDotSizeDirective = true;
    280 
    281   /// True if the target has a single parameter .file directive, this is true
    282   /// for ELF targets.  Defaults to true.
    283   bool HasSingleParameterDotFile = true;
    284 
    285   /// True if the target has a .ident directive, this is true for ELF targets.
    286   /// Defaults to false.
    287   bool HasIdentDirective = false;
    288 
    289   /// True if this target supports the MachO .no_dead_strip directive.  Defaults
    290   /// to false.
    291   bool HasNoDeadStrip = false;
    292 
    293   /// True if this target supports the MachO .alt_entry directive.  Defaults to
    294   /// false.
    295   bool HasAltEntry = false;
    296 
    297   /// Used to declare a global as being a weak symbol. Defaults to ".weak".
    298   const char *WeakDirective;
    299 
    300   /// This directive, if non-null, is used to declare a global as being a weak
    301   /// undefined symbol.  Defaults to nullptr.
    302   const char *WeakRefDirective = nullptr;
    303 
    304   /// True if we have a directive to declare a global as being a weak defined
    305   /// symbol.  Defaults to false.
    306   bool HasWeakDefDirective = false;
    307 
    308   /// True if we have a directive to declare a global as being a weak defined
    309   /// symbol that can be hidden (unexported).  Defaults to false.
    310   bool HasWeakDefCanBeHiddenDirective = false;
    311 
    312   /// True if we have a .linkonce directive.  This is used on cygwin/mingw.
    313   /// Defaults to false.
    314   bool HasLinkOnceDirective = false;
    315 
    316   /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
    317   /// hidden visibility.  Defaults to MCSA_Hidden.
    318   MCSymbolAttr HiddenVisibilityAttr = MCSA_Hidden;
    319 
    320   /// This attribute, if not MCSA_Invalid, is used to declare an undefined
    321   /// symbol as having hidden visibility. Defaults to MCSA_Hidden.
    322   MCSymbolAttr HiddenDeclarationVisibilityAttr = MCSA_Hidden;
    323 
    324   /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
    325   /// protected visibility.  Defaults to MCSA_Protected
    326   MCSymbolAttr ProtectedVisibilityAttr = MCSA_Protected;
    327 
    328   //===--- Dwarf Emission Directives -----------------------------------===//
    329 
    330   /// True if target supports emission of debugging information.  Defaults to
    331   /// false.
    332   bool SupportsDebugInformation = false;
    333 
    334   /// Exception handling format for the target.  Defaults to None.
    335   ExceptionHandling ExceptionsType = ExceptionHandling::None;
    336 
    337   /// Windows exception handling data (.pdata) encoding.  Defaults to Invalid.
    338   WinEH::EncodingType WinEHEncodingType = WinEH::EncodingType::Invalid;
    339 
    340   /// True if Dwarf2 output generally uses relocations for references to other
    341   /// .debug_* sections.
    342   bool DwarfUsesRelocationsAcrossSections = true;
    343 
    344   /// True if DWARF FDE symbol reference relocations should be replaced by an
    345   /// absolute difference.
    346   bool DwarfFDESymbolsUseAbsDiff = false;
    347 
    348   /// True if dwarf register numbers are printed instead of symbolic register
    349   /// names in .cfi_* directives.  Defaults to false.
    350   bool DwarfRegNumForCFI = false;
    351 
    352   /// True if target uses parens to indicate the symbol variant instead of @.
    353   /// For example, foo(plt) instead of foo@plt.  Defaults to false.
    354   bool UseParensForSymbolVariant = false;
    355 
    356   /// True if the target supports flags in ".loc" directive, false if only
    357   /// location is allowed.
    358   bool SupportsExtendedDwarfLocDirective = true;
    359 
    360   //===--- Prologue State ----------------------------------------------===//
    361 
    362   std::vector<MCCFIInstruction> InitialFrameState;
    363 
    364   //===--- Integrated Assembler Information ----------------------------===//
    365 
    366   /// Should we use the integrated assembler?
    367   /// The integrated assembler should be enabled by default (by the
    368   /// constructors) when failing to parse a valid piece of assembly (inline
    369   /// or otherwise) is considered a bug. It may then be overridden after
    370   /// construction (see LLVMTargetMachine::initAsmInfo()).
    371   bool UseIntegratedAssembler;
    372 
    373   /// Preserve Comments in assembly
    374   bool PreserveAsmComments;
    375 
    376   /// Compress DWARF debug sections. Defaults to no compression.
    377   DebugCompressionType CompressDebugSections = DebugCompressionType::None;
    378 
    379   /// True if the integrated assembler should interpret 'a >> b' constant
    380   /// expressions as logical rather than arithmetic.
    381   bool UseLogicalShr = true;
    382 
    383   // If true, emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL, on
    384   // X86_64 ELF.
    385   bool RelaxELFRelocations = true;
    386 
    387   // If true, then the lexer and expression parser will support %neg(),
    388   // %hi(), and similar unary operators.
    389   bool HasMipsExpressions = false;
    390 
    391 public:
    392   explicit MCAsmInfo();
    393   virtual ~MCAsmInfo();
    394 
    395   /// Get the code pointer size in bytes.
    396   unsigned getCodePointerSize() const { return CodePointerSize; }
    397 
    398   /// Get the callee-saved register stack slot
    399   /// size in bytes.
    400   unsigned getCalleeSaveStackSlotSize() const {
    401     return CalleeSaveStackSlotSize;
    402   }
    403 
    404   /// True if the target is little endian.
    405   bool isLittleEndian() const { return IsLittleEndian; }
    406 
    407   /// True if target stack grow up.
    408   bool isStackGrowthDirectionUp() const { return StackGrowsUp; }
    409 
    410   bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
    411 
    412   // Data directive accessors.
    413 
    414   const char *getData8bitsDirective() const { return Data8bitsDirective; }
    415   const char *getData16bitsDirective() const { return Data16bitsDirective; }
    416   const char *getData32bitsDirective() const { return Data32bitsDirective; }
    417   const char *getData64bitsDirective() const { return Data64bitsDirective; }
    418   const char *getGPRel64Directive() const { return GPRel64Directive; }
    419   const char *getGPRel32Directive() const { return GPRel32Directive; }
    420   const char *getDTPRel64Directive() const { return DTPRel64Directive; }
    421   const char *getDTPRel32Directive() const { return DTPRel32Directive; }
    422   const char *getTPRel64Directive() const { return TPRel64Directive; }
    423   const char *getTPRel32Directive() const { return TPRel32Directive; }
    424 
    425   /// Targets can implement this method to specify a section to switch to if the
    426   /// translation unit doesn't have any trampolines that require an executable
    427   /// stack.
    428   virtual MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
    429     return nullptr;
    430   }
    431 
    432   /// True if the section is atomized using the symbols in it.
    433   /// This is false if the section is not atomized at all (most ELF sections) or
    434   /// if it is atomized based on its contents (MachO' __TEXT,__cstring for
    435   /// example).
    436   virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
    437 
    438   virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
    439                                                     unsigned Encoding,
    440                                                     MCStreamer &Streamer) const;
    441 
    442   virtual const MCExpr *getExprForFDESymbol(const MCSymbol *Sym,
    443                                             unsigned Encoding,
    444                                             MCStreamer &Streamer) const;
    445 
    446   /// Return true if the identifier \p Name does not need quotes to be
    447   /// syntactically correct.
    448   virtual bool isValidUnquotedName(StringRef Name) const;
    449 
    450   /// Return true if the .section directive should be omitted when
    451   /// emitting \p SectionName.  For example:
    452   ///
    453   /// shouldOmitSectionDirective(".text")
    454   ///
    455   /// returns false => .section .text,#alloc,#execinstr
    456   /// returns true  => .text
    457   virtual bool shouldOmitSectionDirective(StringRef SectionName) const;
    458 
    459   bool usesSunStyleELFSectionSwitchSyntax() const {
    460     return SunStyleELFSectionSwitchSyntax;
    461   }
    462 
    463   bool usesELFSectionDirectiveForBSS() const {
    464     return UsesELFSectionDirectiveForBSS;
    465   }
    466 
    467   bool needsDwarfSectionOffsetDirective() const {
    468     return NeedsDwarfSectionOffsetDirective;
    469   }
    470 
    471   // Accessors.
    472 
    473   bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
    474   bool hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
    475   bool hasCOFFAssociativeComdats() const { return HasCOFFAssociativeComdats; }
    476   bool hasCOFFComdatConstants() const { return HasCOFFComdatConstants; }
    477   unsigned getMaxInstLength() const { return MaxInstLength; }
    478   unsigned getMinInstAlignment() const { return MinInstAlignment; }
    479   bool getDollarIsPC() const { return DollarIsPC; }
    480   const char *getSeparatorString() const { return SeparatorString; }
    481 
    482   /// This indicates the column (zero-based) at which asm comments should be
    483   /// printed.
    484   unsigned getCommentColumn() const { return 40; }
    485 
    486   StringRef getCommentString() const { return CommentString; }
    487   const char *getLabelSuffix() const { return LabelSuffix; }
    488 
    489   bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
    490   bool needsLocalForSize() const { return NeedsLocalForSize; }
    491   StringRef getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
    492   StringRef getPrivateLabelPrefix() const { return PrivateLabelPrefix; }
    493 
    494   bool hasLinkerPrivateGlobalPrefix() const {
    495     return LinkerPrivateGlobalPrefix[0] != '\0';
    496   }
    497 
    498   StringRef getLinkerPrivateGlobalPrefix() const {
    499     if (hasLinkerPrivateGlobalPrefix())
    500       return LinkerPrivateGlobalPrefix;
    501     return getPrivateGlobalPrefix();
    502   }
    503 
    504   const char *getInlineAsmStart() const { return InlineAsmStart; }
    505   const char *getInlineAsmEnd() const { return InlineAsmEnd; }
    506   const char *getCode16Directive() const { return Code16Directive; }
    507   const char *getCode32Directive() const { return Code32Directive; }
    508   const char *getCode64Directive() const { return Code64Directive; }
    509   unsigned getAssemblerDialect() const { return AssemblerDialect; }
    510   bool doesAllowAtInName() const { return AllowAtInName; }
    511   bool supportsNameQuoting() const { return SupportsQuotedNames; }
    512 
    513   bool doesSupportDataRegionDirectives() const {
    514     return UseDataRegionDirectives;
    515   }
    516 
    517   const char *getZeroDirective() const { return ZeroDirective; }
    518   const char *getAsciiDirective() const { return AsciiDirective; }
    519   const char *getAscizDirective() const { return AscizDirective; }
    520   bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
    521   unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
    522   const char *getGlobalDirective() const { return GlobalDirective; }
    523 
    524   bool doesSetDirectiveSuppressReloc() const {
    525     return SetDirectiveSuppressesReloc;
    526   }
    527 
    528   bool hasAggressiveSymbolFolding() const { return HasAggressiveSymbolFolding; }
    529 
    530   bool getCOMMDirectiveAlignmentIsInBytes() const {
    531     return COMMDirectiveAlignmentIsInBytes;
    532   }
    533 
    534   LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
    535     return LCOMMDirectiveAlignmentType;
    536   }
    537 
    538   bool hasFunctionAlignment() const { return HasFunctionAlignment; }
    539   bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
    540   bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
    541   bool hasIdentDirective() const { return HasIdentDirective; }
    542   bool hasNoDeadStrip() const { return HasNoDeadStrip; }
    543   bool hasAltEntry() const { return HasAltEntry; }
    544   const char *getWeakDirective() const { return WeakDirective; }
    545   const char *getWeakRefDirective() const { return WeakRefDirective; }
    546   bool hasWeakDefDirective() const { return HasWeakDefDirective; }
    547 
    548   bool hasWeakDefCanBeHiddenDirective() const {
    549     return HasWeakDefCanBeHiddenDirective;
    550   }
    551 
    552   bool hasLinkOnceDirective() const { return HasLinkOnceDirective; }
    553 
    554   MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr; }
    555 
    556   MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
    557     return HiddenDeclarationVisibilityAttr;
    558   }
    559 
    560   MCSymbolAttr getProtectedVisibilityAttr() const {
    561     return ProtectedVisibilityAttr;
    562   }
    563 
    564   bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
    565 
    566   bool doesSupportExceptionHandling() const {
    567     return ExceptionsType != ExceptionHandling::None;
    568   }
    569 
    570   ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
    571   WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
    572 
    573   void setExceptionsType(ExceptionHandling EH) {
    574     ExceptionsType = EH;
    575   }
    576 
    577   /// Returns true if the exception handling method for the platform uses call
    578   /// frame information to unwind.
    579   bool usesCFIForEH() const {
    580     return (ExceptionsType == ExceptionHandling::DwarfCFI ||
    581             ExceptionsType == ExceptionHandling::ARM || usesWindowsCFI());
    582   }
    583 
    584   bool usesWindowsCFI() const {
    585     return ExceptionsType == ExceptionHandling::WinEH &&
    586            (WinEHEncodingType != WinEH::EncodingType::Invalid &&
    587             WinEHEncodingType != WinEH::EncodingType::X86);
    588   }
    589 
    590   bool doesDwarfUseRelocationsAcrossSections() const {
    591     return DwarfUsesRelocationsAcrossSections;
    592   }
    593 
    594   bool doDwarfFDESymbolsUseAbsDiff() const { return DwarfFDESymbolsUseAbsDiff; }
    595   bool useDwarfRegNumForCFI() const { return DwarfRegNumForCFI; }
    596   bool useParensForSymbolVariant() const { return UseParensForSymbolVariant; }
    597   bool supportsExtendedDwarfLocDirective() const {
    598     return SupportsExtendedDwarfLocDirective;
    599   }
    600 
    601   void addInitialFrameState(const MCCFIInstruction &Inst) {
    602     InitialFrameState.push_back(Inst);
    603   }
    604 
    605   const std::vector<MCCFIInstruction> &getInitialFrameState() const {
    606     return InitialFrameState;
    607   }
    608 
    609   /// Return true if assembly (inline or otherwise) should be parsed.
    610   bool useIntegratedAssembler() const { return UseIntegratedAssembler; }
    611 
    612   /// Set whether assembly (inline or otherwise) should be parsed.
    613   virtual void setUseIntegratedAssembler(bool Value) {
    614     UseIntegratedAssembler = Value;
    615   }
    616 
    617   /// Return true if assembly (inline or otherwise) should be parsed.
    618   bool preserveAsmComments() const { return PreserveAsmComments; }
    619 
    620   /// Set whether assembly (inline or otherwise) should be parsed.
    621   virtual void setPreserveAsmComments(bool Value) {
    622     PreserveAsmComments = Value;
    623   }
    624 
    625   DebugCompressionType compressDebugSections() const {
    626     return CompressDebugSections;
    627   }
    628 
    629   void setCompressDebugSections(DebugCompressionType CompressDebugSections) {
    630     this->CompressDebugSections = CompressDebugSections;
    631   }
    632 
    633   bool shouldUseLogicalShr() const { return UseLogicalShr; }
    634 
    635   bool canRelaxRelocations() const { return RelaxELFRelocations; }
    636   void setRelaxELFRelocations(bool V) { RelaxELFRelocations = V; }
    637   bool hasMipsExpressions() const { return HasMipsExpressions; }
    638 };
    639 
    640 } // end namespace llvm
    641 
    642 #endif // LLVM_MC_MCASMINFO_H
    643