- /// MCAsmInfo - This class is intended to be used as a base class for asm
- /// properties and features specific to the target.
- class MCAsmInfo {
- protected:
- //===------------------------------------------------------------------===//
- // Properties to be set by the target writer, used to configure asm printer.
- //
-
- /// PointerSize - Pointer size in bytes.
- /// Default is 4.
- unsigned PointerSize;
-
- /// IsLittleEndian - True if target is little endian.
- /// Default is true.
- bool IsLittleEndian;
-
- /// StackGrowsUp - True if target stack grow up.
- /// Default is false.
- bool StackGrowsUp;
-
- /// HasSubsectionsViaSymbols - True if this target has the MachO
- /// .subsections_via_symbols directive.
- bool HasSubsectionsViaSymbols; // Default is false.
-
- /// HasMachoZeroFillDirective - True if this is a MachO target that supports
- /// the macho-specific .zerofill directive for emitting BSS Symbols.
- bool HasMachoZeroFillDirective; // Default is false.
-
- /// HasMachoTBSSDirective - True if this is a MachO target that supports
- /// the macho-specific .tbss directive for emitting thread local BSS Symbols
- bool HasMachoTBSSDirective; // Default is false.
-
- /// HasStaticCtorDtorReferenceInStaticMode - True if the compiler should
- /// emit a ".reference .constructors_used" or ".reference .destructors_used"
- /// directive after the a static ctor/dtor list. This directive is only
- /// emitted in Static relocation model.
- bool HasStaticCtorDtorReferenceInStaticMode; // Default is false.
-
- /// LinkerRequiresNonEmptyDwarfLines - True if the linker has a bug and
- /// requires that the debug_line section be of a minimum size. In practice
- /// such a linker requires a non empty line sequence if a file is present.
- bool LinkerRequiresNonEmptyDwarfLines; // Default to false.
-
- /// MaxInstLength - This is the maximum possible length of an instruction,
- /// which is needed to compute the size of an inline asm.
- unsigned MaxInstLength; // Defaults to 4.
-
- /// PCSymbol - The symbol used to represent the current PC. Used in PC
- /// relative expressions.
- const char *PCSymbol; // Defaults to "$".
-
- /// SeparatorString - This string, if specified, is used to separate
- /// instructions from each other when on the same line.
- const char *SeparatorString; // Defaults to ';'
-
- /// CommentColumn - This indicates the comment num (zero-based) at
- /// which asm comments should be printed.
- unsigned CommentColumn; // Defaults to 40
-
- /// CommentString - This indicates the comment character used by the
- /// assembler.
- const char *CommentString; // Defaults to "#"
-
- /// LabelSuffix - This is appended to emitted labels.
- const char *LabelSuffix; // Defaults to ":"
-
- /// GlobalPrefix - If this is set to a non-empty string, it is prepended
- /// onto all global symbols. This is often used for "_" or ".".
- const char *GlobalPrefix; // Defaults to ""
-
- /// PrivateGlobalPrefix - This prefix is used for globals like constant
- /// pool entries that are completely private to the .s file and should not
- /// have names in the .o file. This is often "." or "L".
- const char *PrivateGlobalPrefix; // Defaults to "."
-
- /// LinkerPrivateGlobalPrefix - 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.
- const char *LinkerPrivateGlobalPrefix; // Defaults to ""
-
- /// InlineAsmStart/End - If these are nonempty, they contain a directive to
- /// emit before and after an inline assembly statement.
- const char *InlineAsmStart; // Defaults to "#APP\n"
- const char *InlineAsmEnd; // Defaults to "#NO_APP\n"
-
- /// Code16Directive, Code32Directive, Code64Directive - These are assembly
- /// directives that tells the assembler to interpret the following
- /// instructions differently.
- const char *Code16Directive; // Defaults to ".code16"
- const char *Code32Directive; // Defaults to ".code32"
- const char *Code64Directive; // Defaults to ".code64"
-
- /// AssemblerDialect - Which dialect of an assembler variant to use.
- unsigned AssemblerDialect; // Defaults to 0
-
- /// AllowQuotesInName - This is true if the assembler allows for complex
- /// symbol names to be surrounded in quotes. This defaults to false.
- bool AllowQuotesInName;
-
- /// AllowNameToStartWithDigit - This is true if the assembler allows symbol
- /// names to start with a digit (e.g., "0x0021"). This defaults to false.
- bool AllowNameToStartWithDigit;
-
- /// AllowPeriodsInName - This is true if the assembler allows periods in
- /// symbol names. This defaults to true.
- bool AllowPeriodsInName;
-
- //===--- Data Emission Directives -------------------------------------===//
-
- /// ZeroDirective - this should be set to the directive used to get some
- /// number of zero bytes emitted to the current section. Common cases are
- /// "\t.zero\t" and "\t.space\t". If this is set to null, the
- /// Data*bitsDirective's will be used to emit zero bytes.
- const char *ZeroDirective; // Defaults to "\t.zero\t"
-
- /// AsciiDirective - This directive allows emission of an ascii string with
- /// the standard C escape characters embedded into it.
- const char *AsciiDirective; // Defaults to "\t.ascii\t"
-
- /// AscizDirective - 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.
- const char *AscizDirective; // Defaults to "\t.asciz\t"
-
- /// DataDirectives - 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.
- const char *Data8bitsDirective; // Defaults to "\t.byte\t"
- const char *Data16bitsDirective; // Defaults to "\t.short\t"
- const char *Data32bitsDirective; // Defaults to "\t.long\t"
- const char *Data64bitsDirective; // Defaults to "\t.quad\t"
-
- /// [Data|Code]Begin - These magic labels are used to marked a region as
- /// data or code, and are used to provide additional information for
- /// correct disassembly on targets that like to mix data and code within
- /// a segment. These labels will be implicitly suffixed by the streamer
- /// to give them unique names.
- const char *DataBegin; // Defaults to "$d."
- const char *CodeBegin; // Defaults to "$a."
- const char *JT8Begin; // Defaults to "$a."
- const char *JT16Begin; // Defaults to "$a."
- const char *JT32Begin; // Defaults to "$a."
- bool SupportsDataRegions;
-
- /// GPRel64Directive - if non-null, a directive that is used to emit a word
- /// which should be relocated as a 64-bit GP-relative offset, e.g. .gpdword
- /// on Mips.
- const char *GPRel64Directive; // Defaults to NULL.
-
- /// GPRel32Directive - if non-null, a directive that is used to emit a word
- /// which should be relocated as a 32-bit GP-relative offset, e.g. .gpword
- /// on Mips or .gprel32 on Alpha.
- const char *GPRel32Directive; // Defaults to NULL.
-
- /// getDataASDirective - Return the directive that should be used to emit
- /// data of the specified size to the specified numeric address space.
- virtual const char *getDataASDirective(unsigned Size, unsigned AS) const {
- assert(AS != 0 && "Don't know the directives for default addr space");
- return 0;
- }
-
- /// SunStyleELFSectionSwitchSyntax - 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.
- bool SunStyleELFSectionSwitchSyntax; // Defaults to false.
-
- /// UsesELFSectionDirectiveForBSS - 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.
- bool UsesELFSectionDirectiveForBSS; // Defaults to false.
-
- /// HasMicrosoftFastStdCallMangling - True if this target uses microsoft
- /// style mangling for functions with X86_StdCall/X86_FastCall calling
- /// convention.
- bool HasMicrosoftFastStdCallMangling; // Defaults to false.
-
- //===--- Alignment Information ----------------------------------------===//
-
- /// AlignDirective - The directive used to emit round up to an alignment
- /// boundary.
- ///
- const char *AlignDirective; // Defaults to "\t.align\t"
-
- /// AlignmentIsInBytes - 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.
- bool AlignmentIsInBytes; // Defaults to true
-
- /// TextAlignFillValue - If non-zero, this is used to fill the executable
- /// space created as the result of a alignment directive.
- unsigned TextAlignFillValue; // Defaults to 0
-
- //===--- Global Variable Emission Directives --------------------------===//
-
- /// GlobalDirective - This is the directive used to declare a global entity.
- ///
- const char *GlobalDirective; // Defaults to NULL.
-
- /// ExternDirective - This is the directive used to declare external
- /// globals.
- ///
- const char *ExternDirective; // Defaults to NULL.
-
- /// HasSetDirective - True if the assembler supports the .set directive.
- bool HasSetDirective; // Defaults to true.
-
- /// HasAggressiveSymbolFolding - False if the assembler requires that we use
- /// Lc = a - b
- /// .long Lc
- /// instead of
- /// .long a - b
- bool HasAggressiveSymbolFolding; // Defaults to true.
-
- /// LCOMMDirectiveType - Describes if the target supports the .lcomm
- /// directive and whether it has an alignment parameter.
- LCOMM::LCOMMType LCOMMDirectiveType; // Defaults to LCOMM::None.
-
- /// COMMDirectiveAlignmentIsInBytes - True is COMMDirective's optional
- /// alignment is to be specified in bytes instead of log2(n).
- bool COMMDirectiveAlignmentIsInBytes; // Defaults to true;
-
- /// HasDotTypeDotSizeDirective - True if the target has .type and .size
- /// directives, this is true for most ELF targets.
- bool HasDotTypeDotSizeDirective; // Defaults to true.
-
- /// HasSingleParameterDotFile - True if the target has a single parameter
- /// .file directive, this is true for ELF targets.
- bool HasSingleParameterDotFile; // Defaults to true.
-
- /// HasNoDeadStrip - True if this target supports the MachO .no_dead_strip
- /// directive.
- bool HasNoDeadStrip; // Defaults to false.
-
- /// HasSymbolResolver - True if this target supports the MachO
- /// .symbol_resolver directive.
- bool HasSymbolResolver; // Defaults to false.
-
- /// WeakRefDirective - This directive, if non-null, is used to declare a
- /// global as being a weak undefined symbol.
- const char *WeakRefDirective; // Defaults to NULL.
-
- /// WeakDefDirective - This directive, if non-null, is used to declare a
- /// global as being a weak defined symbol.
- const char *WeakDefDirective; // Defaults to NULL.
-
- /// LinkOnceDirective - This directive, if non-null is used to declare a
- /// global as being a weak defined symbol. This is used on cygwin/mingw.
- const char *LinkOnceDirective; // Defaults to NULL.
-
- /// HiddenVisibilityAttr - This attribute, if not MCSA_Invalid, is used to
- /// declare a symbol as having hidden visibility.
- MCSymbolAttr HiddenVisibilityAttr; // Defaults to MCSA_Hidden.
-
- /// HiddenDeclarationVisibilityAttr - This attribute, if not MCSA_Invalid,
- /// is used to declare an undefined symbol as having hidden visibility.
- MCSymbolAttr HiddenDeclarationVisibilityAttr; // Defaults to MCSA_Hidden.
-
-
- /// ProtectedVisibilityAttr - This attribute, if not MCSA_Invalid, is used
- /// to declare a symbol as having protected visibility.
- MCSymbolAttr ProtectedVisibilityAttr; // Defaults to MCSA_Protected
-
- //===--- Dwarf Emission Directives -----------------------------------===//
-
- /// HasLEB128 - True if target asm supports leb128 directives.
- bool HasLEB128; // Defaults to false.
-
- /// SupportsDebugInformation - True if target supports emission of debugging
- /// information.
- bool SupportsDebugInformation; // Defaults to false.
-
- /// SupportsExceptionHandling - True if target supports exception handling.
- ExceptionHandling::ExceptionsType ExceptionsType; // Defaults to None
-
- /// DwarfUsesInlineInfoSection - True if DwarfDebugInlineSection is used to
- /// encode inline subroutine information.
- bool DwarfUsesInlineInfoSection; // Defaults to false.
-
- /// DwarfSectionOffsetDirective - Special section offset directive.
- const char* DwarfSectionOffsetDirective; // Defaults to NULL
-
- /// DwarfRequiresRelocationForSectionOffset - True if we need to produce a
- /// relocation when we want a section offset in dwarf.
- bool DwarfRequiresRelocationForSectionOffset; // Defaults to true;
-
- /// DwarfUsesLabelOffsetDifference - True if Dwarf2 output can
- /// use EmitLabelOffsetDifference.
- bool DwarfUsesLabelOffsetForRanges;
-
- /// DwarfUsesRelocationsForStringPool - True if this Dwarf output must use
- /// relocations to refer to entries in the string pool.
- bool DwarfUsesRelocationsForStringPool;
-
- /// DwarfRegNumForCFI - True if dwarf register numbers are printed
- /// instead of symbolic register names in .cfi_* directives.
- bool DwarfRegNumForCFI; // Defaults to false;
-
- //===--- CBE Asm Translation Table -----------------------------------===//
-
- const char *const *AsmTransCBE; // Defaults to empty
-
- //===--- Prologue State ----------------------------------------------===//
-
- std::vector<MachineMove> InitialFrameState;
-
- public:
- explicit MCAsmInfo();
- virtual ~MCAsmInfo();
-
- // FIXME: move these methods to DwarfPrinter when the JIT stops using them.
- static unsigned getSLEB128Size(int Value);
- static unsigned getULEB128Size(unsigned Value);
-
- /// getPointerSize - Get the pointer size in bytes.
- unsigned getPointerSize() const {
- return PointerSize;
- }
-
- /// islittleendian - True if the target is little endian.
- bool isLittleEndian() const {
- return IsLittleEndian;
- }
-
- /// isStackGrowthDirectionUp - True if target stack grow up.
- bool isStackGrowthDirectionUp() const {
- return StackGrowsUp;
- }
-
- bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
-
- // Data directive accessors.
- //
- const char *getData8bitsDirective(unsigned AS = 0) const {
- return AS == 0 ? Data8bitsDirective : getDataASDirective(8, AS);
- }
- const char *getData16bitsDirective(unsigned AS = 0) const {
- return AS == 0 ? Data16bitsDirective : getDataASDirective(16, AS);
- }
- const char *getData32bitsDirective(unsigned AS = 0) const {
- return AS == 0 ? Data32bitsDirective : getDataASDirective(32, AS);
- }
- const char *getData64bitsDirective(unsigned AS = 0) const {
- return AS == 0 ? Data64bitsDirective : getDataASDirective(64, AS);
- }
- const char *getGPRel64Directive() const { return GPRel64Directive; }
- const char *getGPRel32Directive() const { return GPRel32Directive; }
-
- /// [Code|Data]Begin label name accessors.
- const char *getCodeBeginLabelName() const { return CodeBegin; }
- const char *getDataBeginLabelName() const { return DataBegin; }
- const char *getJumpTable8BeginLabelName() const { return JT8Begin; }
- const char *getJumpTable16BeginLabelName() const { return JT16Begin; }
- const char *getJumpTable32BeginLabelName() const { return JT32Begin; }
- bool getSupportsDataRegions() const { return SupportsDataRegions; }
-
- /// getNonexecutableStackSection - Targets can implement this method to
- /// specify a section to switch to if the translation unit doesn't have any
- /// trampolines that require an executable stack.
- virtual const MCSection *getNonexecutableStackSection(MCContext &Ctx) const{
- return 0;
- }
-
- virtual const MCExpr *
- getExprForPersonalitySymbol(const MCSymbol *Sym,
- unsigned Encoding,
- MCStreamer &Streamer) const;
-
- const MCExpr *
- getExprForFDESymbol(const MCSymbol *Sym,
- unsigned Encoding,
- MCStreamer &Streamer) const;
-
- bool usesSunStyleELFSectionSwitchSyntax() const {
- return SunStyleELFSectionSwitchSyntax;
- }
-
- bool usesELFSectionDirectiveForBSS() const {
- return UsesELFSectionDirectiveForBSS;
- }
-
- bool hasMicrosoftFastStdCallMangling() const {
- return HasMicrosoftFastStdCallMangling;
- }
-
- // Accessors.
- //
- bool hasMachoZeroFillDirective() const { return HasMachoZeroFillDirective; }
- bool hasMachoTBSSDirective() const { return HasMachoTBSSDirective; }
- bool hasStaticCtorDtorReferenceInStaticMode() const {
- return HasStaticCtorDtorReferenceInStaticMode;
- }
- bool getLinkerRequiresNonEmptyDwarfLines() const {
- return LinkerRequiresNonEmptyDwarfLines;
- }
- unsigned getMaxInstLength() const {
- return MaxInstLength;
- }
- const char *getPCSymbol() const {
- return PCSymbol;
- }
- const char *getSeparatorString() const {
- return SeparatorString;
- }
- unsigned getCommentColumn() const {
- return CommentColumn;
- }
- const char *getCommentString() const {
- return CommentString;
- }
- const char *getLabelSuffix() const {
- return LabelSuffix;
- }
- const char *getGlobalPrefix() const {
- return GlobalPrefix;
- }
- const char *getPrivateGlobalPrefix() const {
- return PrivateGlobalPrefix;
- }
- const char *getLinkerPrivateGlobalPrefix() const {