include/llvm/MC/MCAsmInfo.h

   1 //===-- llvm/MC/MCAsmInfo.h - Asm info --------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains a class to be used as the basis for target specific
  10 // asm writers.  This class primarily takes care of global printing constants,
  11 // which are used in very similar ways across all targets.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef LLVM_MC_MCASMINFO_H
  16 #define LLVM_MC_MCASMINFO_H
  17
  18 #include "llvm/ADT/StringRef.h"
  19 #include "llvm/MC/MCDirectives.h"
  20 #include "llvm/MC/MCTargetOptions.h"
  21 #include <vector>
  22
  23 namespace llvm {
  24
  25 class MCContext;
  26 class MCCFIInstruction;
  27 class MCExpr;
  28 class MCSection;
  29 class MCStreamer;
  30 class MCSubtargetInfo;
  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   /// True if .align is to be used for alignment. Only power-of-two
 169   /// alignment is supported.
 170   bool UseDotAlignForAlignment = false;
 171
 172   //===--- Data Emission Directives -------------------------------------===//
 173
 174   /// This should be set to the directive used to get some number of zero bytes
 175   /// emitted to the current section.  Common cases are "\t.zero\t" and
 176   /// "\t.space\t".  If this is set to null, the Data*bitsDirective's will be
 177   /// used to emit zero bytes.  Defaults to "\t.zero\t"
 178   const char *ZeroDirective;
 179
 180   /// This directive allows emission of an ascii string with the standard C
 181   /// escape characters embedded into it.  If a target doesn't support this, it
 182   /// can be set to null. Defaults to "\t.ascii\t"
 183   const char *AsciiDirective;
 184
 185   /// If not null, this allows for special handling of zero terminated strings
 186   /// on this target.  This is commonly supported as ".asciz".  If a target
 187   /// doesn't support this, it can be set to null.  Defaults to "\t.asciz\t"
 188   const char *AscizDirective;
 189
 190   /// These directives are used to output some unit of integer data to the
 191   /// current section.  If a data directive is set to null, smaller data
 192   /// directives will be used to emit the large sizes.  Defaults to "\t.byte\t",
 193   /// "\t.short\t", "\t.long\t", "\t.quad\t"
 194   const char *Data8bitsDirective;
 195   const char *Data16bitsDirective;
 196   const char *Data32bitsDirective;
 197   const char *Data64bitsDirective;
 198
 199   /// If non-null, a directive that is used to emit a word which should be
 200   /// relocated as a 64-bit GP-relative offset, e.g. .gpdword on Mips.  Defaults
 201   /// to nullptr.
 202   const char *GPRel64Directive = nullptr;
 203
 204   /// If non-null, a directive that is used to emit a word which should be
 205   /// relocated as a 32-bit GP-relative offset, e.g. .gpword on Mips or .gprel32
 206   /// on Alpha.  Defaults to nullptr.
 207   const char *GPRel32Directive = nullptr;
 208
 209   /// If non-null, directives that are used to emit a word/dword which should
 210   /// be relocated as a 32/64-bit DTP/TP-relative offset, e.g. .dtprelword/
 211   /// .dtpreldword/.tprelword/.tpreldword on Mips.
 212   const char *DTPRel32Directive = nullptr;
 213   const char *DTPRel64Directive = nullptr;
 214   const char *TPRel32Directive = nullptr;
 215   const char *TPRel64Directive = nullptr;
 216
 217   /// This is true if this target uses "Sun Style" syntax for section switching
 218   /// ("#alloc,#write" etc) instead of the normal ELF syntax (,"a,w") in
 219   /// .section directives.  Defaults to false.
 220   bool SunStyleELFSectionSwitchSyntax = false;
 221
 222   /// This is true if this target uses ELF '.section' directive before the
 223   /// '.bss' one. It's used for PPC/Linux which doesn't support the '.bss'
 224   /// directive only.  Defaults to false.
 225   bool UsesELFSectionDirectiveForBSS = false;
 226
 227   bool NeedsDwarfSectionOffsetDirective = false;
 228
 229   //===--- Alignment Information ----------------------------------------===//
 230
 231   /// If this is true (the default) then the asmprinter emits ".align N"
 232   /// directives, where N is the number of bytes to align to.  Otherwise, it
 233   /// emits ".align log2(N)", e.g. 3 to align to an 8 byte boundary.  Defaults
 234   /// to true.
 235   bool AlignmentIsInBytes = true;
 236
 237   /// If non-zero, this is used to fill the executable space created as the
 238   /// result of a alignment directive.  Defaults to 0
 239   unsigned TextAlignFillValue = 0;
 240
 241   //===--- Global Variable Emission Directives --------------------------===//
 242
 243   /// This is the directive used to declare a global entity. Defaults to
 244   /// ".globl".
 245   const char *GlobalDirective;
 246
 247   /// True if the expression
 248   ///   .long f - g
 249   /// uses a relocation but it can be suppressed by writing
 250   ///   a = f - g
 251   ///   .long a
 252   bool SetDirectiveSuppressesReloc = false;
 253
 254   /// False if the assembler requires that we use
 255   /// \code
 256   ///   Lc = a - b
 257   ///   .long Lc
 258   /// \endcode
 259   //
 260   /// instead of
 261   //
 262   /// \code
 263   ///   .long a - b
 264   /// \endcode
 265   ///
 266   ///  Defaults to true.
 267   bool HasAggressiveSymbolFolding = true;
 268
 269   /// True is .comm's and .lcomms optional alignment is to be specified in bytes
 270   /// instead of log2(n).  Defaults to true.
 271   bool COMMDirectiveAlignmentIsInBytes = true;
 272
 273   /// Describes if the .lcomm directive for the target supports an alignment
 274   /// argument and how it is interpreted.  Defaults to NoAlignment.
 275   LCOMM::LCOMMType LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;
 276
 277   // True if the target allows .align directives on functions. This is true for
 278   // most targets, so defaults to true.
 279   bool HasFunctionAlignment = true;
 280
 281   /// True if the target has .type and .size directives, this is true for most
 282   /// ELF targets.  Defaults to true.
 283   bool HasDotTypeDotSizeDirective = true;
 284
 285   /// True if the target has a single parameter .file directive, this is true
 286   /// for ELF targets.  Defaults to true.
 287   bool HasSingleParameterDotFile = true;
 288
 289   /// True if the target has a .ident directive, this is true for ELF targets.
 290   /// Defaults to false.
 291   bool HasIdentDirective = false;
 292
 293   /// True if this target supports the MachO .no_dead_strip directive.  Defaults
 294   /// to false.
 295   bool HasNoDeadStrip = false;
 296
 297   /// True if this target supports the MachO .alt_entry directive.  Defaults to
 298   /// false.
 299   bool HasAltEntry = false;
 300
 301   /// Used to declare a global as being a weak symbol. Defaults to ".weak".
 302   const char *WeakDirective;
 303
 304   /// This directive, if non-null, is used to declare a global as being a weak
 305   /// undefined symbol.  Defaults to nullptr.
 306   const char *WeakRefDirective = nullptr;
 307
 308   /// True if we have a directive to declare a global as being a weak defined
 309   /// symbol.  Defaults to false.
 310   bool HasWeakDefDirective = false;
 311
 312   /// True if we have a directive to declare a global as being a weak defined
 313   /// symbol that can be hidden (unexported).  Defaults to false.
 314   bool HasWeakDefCanBeHiddenDirective = false;
 315
 316   /// True if we have a .linkonce directive.  This is used on cygwin/mingw.
 317   /// Defaults to false.
 318   bool HasLinkOnceDirective = false;
 319
 320   /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
 321   /// hidden visibility.  Defaults to MCSA_Hidden.
 322   MCSymbolAttr HiddenVisibilityAttr = MCSA_Hidden;
 323
 324   /// This attribute, if not MCSA_Invalid, is used to declare an undefined
 325   /// symbol as having hidden visibility. Defaults to MCSA_Hidden.
 326   MCSymbolAttr HiddenDeclarationVisibilityAttr = MCSA_Hidden;
 327
 328   /// This attribute, if not MCSA_Invalid, is used to declare a symbol as having
 329   /// protected visibility.  Defaults to MCSA_Protected
 330   MCSymbolAttr ProtectedVisibilityAttr = MCSA_Protected;
 331
 332   //===--- Dwarf Emission Directives -----------------------------------===//
 333
 334   /// True if target supports emission of debugging information.  Defaults to
 335   /// false.
 336   bool SupportsDebugInformation = false;
 337
 338   /// Exception handling format for the target.  Defaults to None.
 339   ExceptionHandling ExceptionsType = ExceptionHandling::None;
 340
 341   /// Windows exception handling data (.pdata) encoding.  Defaults to Invalid.
 342   WinEH::EncodingType WinEHEncodingType = WinEH::EncodingType::Invalid;
 343
 344   /// True if Dwarf2 output generally uses relocations for references to other
 345   /// .debug_* sections.
 346   bool DwarfUsesRelocationsAcrossSections = true;
 347
 348   /// True if DWARF FDE symbol reference relocations should be replaced by an
 349   /// absolute difference.
 350   bool DwarfFDESymbolsUseAbsDiff = false;
 351
 352   /// True if dwarf register numbers are printed instead of symbolic register
 353   /// names in .cfi_* directives.  Defaults to false.
 354   bool DwarfRegNumForCFI = false;
 355
 356   /// True if target uses parens to indicate the symbol variant instead of @.
 357   /// For example, foo(plt) instead of foo@plt.  Defaults to false.
 358   bool UseParensForSymbolVariant = false;
 359
 360   /// True if the target supports flags in ".loc" directive, false if only
 361   /// location is allowed.
 362   bool SupportsExtendedDwarfLocDirective = true;
 363
 364   //===--- Prologue State ----------------------------------------------===//
 365
 366   std::vector<MCCFIInstruction> InitialFrameState;
 367
 368   //===--- Integrated Assembler Information ----------------------------===//
 369
 370   /// Should we use the integrated assembler?
 371   /// The integrated assembler should be enabled by default (by the
 372   /// constructors) when failing to parse a valid piece of assembly (inline
 373   /// or otherwise) is considered a bug. It may then be overridden after
 374   /// construction (see LLVMTargetMachine::initAsmInfo()).
 375   bool UseIntegratedAssembler;
 376
 377   /// Preserve Comments in assembly
 378   bool PreserveAsmComments;
 379
 380   /// Compress DWARF debug sections. Defaults to no compression.
 381   DebugCompressionType CompressDebugSections = DebugCompressionType::None;
 382
 383   /// True if the integrated assembler should interpret 'a >> b' constant
 384   /// expressions as logical rather than arithmetic.
 385   bool UseLogicalShr = true;
 386
 387   // If true, emit GOTPCRELX/REX_GOTPCRELX instead of GOTPCREL, on
 388   // X86_64 ELF.
 389   bool RelaxELFRelocations = true;
 390
 391   // If true, then the lexer and expression parser will support %neg(),
 392   // %hi(), and similar unary operators.
 393   bool HasMipsExpressions = false;
 394
 395 public:
 396   explicit MCAsmInfo();
 397   virtual ~MCAsmInfo();
 398
 399   /// Get the code pointer size in bytes.
 400   unsigned getCodePointerSize() const { return CodePointerSize; }
 401
 402   /// Get the callee-saved register stack slot
 403   /// size in bytes.
 404   unsigned getCalleeSaveStackSlotSize() const {
 405     return CalleeSaveStackSlotSize;
 406   }
 407
 408   /// True if the target is little endian.
 409   bool isLittleEndian() const { return IsLittleEndian; }
 410
 411   /// True if target stack grow up.
 412   bool isStackGrowthDirectionUp() const { return StackGrowsUp; }
 413
 414   bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
 415
 416   // Data directive accessors.
 417
 418   const char *getData8bitsDirective() const { return Data8bitsDirective; }
 419   const char *getData16bitsDirective() const { return Data16bitsDirective; }
 420   const char *getData32bitsDirective() const { return Data32bitsDirective; }
 421   const char *getData64bitsDirective() const { return Data64bitsDirective; }
 422   const char *getGPRel64Directive() const { return GPRel64Directive; }
 423   const char *getGPRel32Directive() const { return GPRel32Directive; }
 424   const char *getDTPRel64Directive() const { return DTPRel64Directive; }
 425   const char *getDTPRel32Directive() const { return DTPRel32Directive; }
 426   const char *getTPRel64Directive() const { return TPRel64Directive; }
 427   const char *getTPRel32Directive() const { return TPRel32Directive; }
 428
 429   /// Targets can implement this method to specify a section to switch to if the
 430   /// translation unit doesn't have any trampolines that require an executable
 431   /// stack.
 432   virtual MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
 433     return nullptr;
 434   }
 435
 436   /// True if the section is atomized using the symbols in it.
 437   /// This is false if the section is not atomized at all (most ELF sections) or
 438   /// if it is atomized based on its contents (MachO' __TEXT,__cstring for
 439   /// example).
 440   virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
 441
 442   virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
 443                                                     unsigned Encoding,
 444                                                     MCStreamer &Streamer) const;
 445
 446   virtual const MCExpr *getExprForFDESymbol(const MCSymbol *Sym,
 447                                             unsigned Encoding,
 448                                             MCStreamer &Streamer) const;
 449
 450   /// Return true if the identifier \p Name does not need quotes to be
 451   /// syntactically correct.
 452   virtual bool isValidUnquotedName(StringRef Name) const;
 453
 454   /// Return true if the .section directive should be omitted when
 455   /// emitting \p SectionName.  For example:
 456   ///
 457   /// shouldOmitSectionDirective(".text")
 458   ///
 459   /// returns false => .section .text,#alloc,#execinstr
 460   /// returns true  => .text
 461   virtual bool shouldOmitSectionDirective(StringRef SectionName) const;
 462
 463   bool usesSunStyleELFSectionSwitchSyntax() const {
 464     return SunStyleELFSectionSwitchSyntax;
 465   }
 466
 467   bool usesELFSectionDirectiveForBSS() const {
 468     return UsesELFSectionDirectiveForBSS;
 469   }
 470
 471   bool needsDwarfSectionOffsetDirective() const {
 472     return NeedsDwarfSectionOffsetDirective;
 473   }
 474
 475   // Accessors.
 476
 477   bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
 478   bool hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
 479   bool hasCOFFAssociativeComdats() const { return HasCOFFAssociativeComdats; }
 480   bool hasCOFFComdatConstants() const { return HasCOFFComdatConstants; }
 481
 482   /// Returns the maximum possible encoded instruction size in bytes. If \p STI
 483   /// is null, this should be the maximum size for any subtarget.
 484   virtual unsigned getMaxInstLength(const MCSubtargetInfo *STI = nullptr) const {
 485     return MaxInstLength;
 486   }
 487
 488   unsigned getMinInstAlignment() const { return MinInstAlignment; }
 489   bool getDollarIsPC() const { return DollarIsPC; }
 490   const char *getSeparatorString() const { return SeparatorString; }
 491
 492   /// This indicates the column (zero-based) at which asm comments should be
 493   /// printed.
 494   unsigned getCommentColumn() const { return 40; }
 495
 496   StringRef getCommentString() const { return CommentString; }
 497   const char *getLabelSuffix() const { return LabelSuffix; }
 498
 499   bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
 500   bool needsLocalForSize() const { return NeedsLocalForSize; }
 501   StringRef getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
 502   StringRef getPrivateLabelPrefix() const { return PrivateLabelPrefix; }
 503
 504   bool hasLinkerPrivateGlobalPrefix() const {
 505     return !LinkerPrivateGlobalPrefix.empty();
 506   }
 507
 508   StringRef getLinkerPrivateGlobalPrefix() const {
 509     if (hasLinkerPrivateGlobalPrefix())
 510       return LinkerPrivateGlobalPrefix;
 511     return getPrivateGlobalPrefix();
 512   }
 513
 514   const char *getInlineAsmStart() const { return InlineAsmStart; }
 515   const char *getInlineAsmEnd() const { return InlineAsmEnd; }
 516   const char *getCode16Directive() const { return Code16Directive; }
 517   const char *getCode32Directive() const { return Code32Directive; }
 518   const char *getCode64Directive() const { return Code64Directive; }
 519   unsigned getAssemblerDialect() const { return AssemblerDialect; }
 520   bool doesAllowAtInName() const { return AllowAtInName; }
 521   bool supportsNameQuoting() const { return SupportsQuotedNames; }
 522
 523   bool doesSupportDataRegionDirectives() const {
 524     return UseDataRegionDirectives;
 525   }
 526
 527   bool useDotAlignForAlignment() const {
 528     return UseDotAlignForAlignment;
 529   }
 530
 531   const char *getZeroDirective() const { return ZeroDirective; }
 532   const char *getAsciiDirective() const { return AsciiDirective; }
 533   const char *getAscizDirective() const { return AscizDirective; }
 534   bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
 535   unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
 536   const char *getGlobalDirective() const { return GlobalDirective; }
 537
 538   bool doesSetDirectiveSuppressReloc() const {
 539     return SetDirectiveSuppressesReloc;
 540   }
 541
 542   bool hasAggressiveSymbolFolding() const { return HasAggressiveSymbolFolding; }
 543
 544   bool getCOMMDirectiveAlignmentIsInBytes() const {
 545     return COMMDirectiveAlignmentIsInBytes;
 546   }
 547
 548   LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
 549     return LCOMMDirectiveAlignmentType;
 550   }
 551
 552   bool hasFunctionAlignment() const { return HasFunctionAlignment; }
 553   bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
 554   bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
 555   bool hasIdentDirective() const { return HasIdentDirective; }
 556   bool hasNoDeadStrip() const { return HasNoDeadStrip; }
 557   bool hasAltEntry() const { return HasAltEntry; }
 558   const char *getWeakDirective() const { return WeakDirective; }
 559   const char *getWeakRefDirective() const { return WeakRefDirective; }
 560   bool hasWeakDefDirective() const { return HasWeakDefDirective; }
 561
 562   bool hasWeakDefCanBeHiddenDirective() const {
 563     return HasWeakDefCanBeHiddenDirective;
 564   }
 565
 566   bool hasLinkOnceDirective() const { return HasLinkOnceDirective; }
 567
 568   MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr; }
 569
 570   MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
 571     return HiddenDeclarationVisibilityAttr;
 572   }
 573
 574   MCSymbolAttr getProtectedVisibilityAttr() const {
 575     return ProtectedVisibilityAttr;
 576   }
 577
 578   bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
 579
 580   bool doesSupportExceptionHandling() const {
 581     return ExceptionsType != ExceptionHandling::None;
 582   }
 583
 584   ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
 585   WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
 586
 587   void setExceptionsType(ExceptionHandling EH) {
 588     ExceptionsType = EH;
 589   }
 590
 591   /// Returns true if the exception handling method for the platform uses call
 592   /// frame information to unwind.
 593   bool usesCFIForEH() const {
 594     return (ExceptionsType == ExceptionHandling::DwarfCFI ||
 595             ExceptionsType == ExceptionHandling::ARM || usesWindowsCFI());
 596   }
 597
 598   bool usesWindowsCFI() const {
 599     return ExceptionsType == ExceptionHandling::WinEH &&
 600            (WinEHEncodingType != WinEH::EncodingType::Invalid &&
 601             WinEHEncodingType != WinEH::EncodingType::X86);
 602   }
 603
 604   bool doesDwarfUseRelocationsAcrossSections() const {
 605     return DwarfUsesRelocationsAcrossSections;
 606   }
 607
 608   bool doDwarfFDESymbolsUseAbsDiff() const { return DwarfFDESymbolsUseAbsDiff; }
 609   bool useDwarfRegNumForCFI() const { return DwarfRegNumForCFI; }
 610   bool useParensForSymbolVariant() const { return UseParensForSymbolVariant; }
 611   bool supportsExtendedDwarfLocDirective() const {
 612     return SupportsExtendedDwarfLocDirective;
 613   }
 614
 615   void addInitialFrameState(const MCCFIInstruction &Inst);
 616
 617   const std::vector<MCCFIInstruction> &getInitialFrameState() const {
 618     return InitialFrameState;
 619   }
 620
 621   /// Return true if assembly (inline or otherwise) should be parsed.
 622   bool useIntegratedAssembler() const { return UseIntegratedAssembler; }
 623
 624   /// Set whether assembly (inline or otherwise) should be parsed.
 625   virtual void setUseIntegratedAssembler(bool Value) {
 626     UseIntegratedAssembler = Value;
 627   }
 628
 629   /// Return true if assembly (inline or otherwise) should be parsed.
 630   bool preserveAsmComments() const { return PreserveAsmComments; }
 631
 632   /// Set whether assembly (inline or otherwise) should be parsed.
 633   virtual void setPreserveAsmComments(bool Value) {
 634     PreserveAsmComments = Value;
 635   }
 636
 637   DebugCompressionType compressDebugSections() const {
 638     return CompressDebugSections;
 639   }
 640
 641   void setCompressDebugSections(DebugCompressionType CompressDebugSections) {
 642     this->CompressDebugSections = CompressDebugSections;
 643   }
 644
 645   bool shouldUseLogicalShr() const { return UseLogicalShr; }
 646
 647   bool canRelaxRelocations() const { return RelaxELFRelocations; }
 648   void setRelaxELFRelocations(bool V) { RelaxELFRelocations = V; }
 649   bool hasMipsExpressions() const { return HasMipsExpressions; }
 650 };
 651
 652 } // end namespace llvm
 653
 654 #endif // LLVM_MC_MCASMINFO_H