include/llvm/MC/MCAsmInfo.h - llvm - Git at Google

 //===-- llvm/MC/MCAsmInfo.h - Asm info --------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains a class to be used as the basis for target specific
 // asm writers.  This class primarily takes care of global printing constants,
 // which are used in very similar ways across all targets.
 //
 //===----------------------------------------------------------------------===//

 #ifndef LLVM_MC_MCASMINFO_H
 #define LLVM_MC_MCASMINFO_H

 #include "llvm/MC/MCDirectives.h"
 #include "llvm/MC/MachineLocation.h"
 #include <cassert>
 #include <vector>

 namespace llvm {
   class MCExpr;
   class MCSection;
   class MCStreamer;
   class MCSymbol;
   class MCContext;

   namespace ExceptionHandling {
     enum ExceptionsType { None, DwarfCFI, SjLj, ARM, Win64 };
   }

   namespace LCOMM {
     enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
   }

   /// 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;

     /// CalleeSaveStackSlotSize - Size of the stack slot reserved for
     ///                           callee-saved registers, in bytes.
     ///                           Default is same as pointer size.
     unsigned CalleeSaveStackSlotSize;

     /// 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 ":"

     /// LabelSuffix - This is appended to emitted labels.
     const char *DebugLabelSuffix;                 // 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;

     /// AllowUTF8 - This is true if the assembler accepts UTF-8 input.
     // FIXME: Make this a more general encoding setting?
     bool AllowUTF8;

     /// UseDataRegionDirectives - This is true if data region markers should
     /// be printed as ".data_region/.end_data_region" directives. If false,
     /// use "$d/$a" labels instead.
     bool UseDataRegionDirectives;

     //===--- 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"

     /// 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.

     bool NeedsDwarfSectionOffsetDirective;

     //===--- 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.

     /// COMMDirectiveAlignmentIsInBytes - True is .comm's and .lcomms optional
     /// alignment is to be specified in bytes instead of log2(n).
     bool COMMDirectiveAlignmentIsInBytes;    // Defaults to true;

     /// LCOMMDirectiveAlignment - Describes if the .lcomm directive for the
     /// target supports an alignment argument and how it is interpreted.
     LCOMM::LCOMMType LCOMMDirectiveAlignmentType; // Defaults to NoAlignment.

     /// 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.

     /// DwarfUsesRelocationsAcrossSections - True if Dwarf2 output generally
     /// uses relocations for references to other .debug_* sections.
     bool DwarfUsesRelocationsAcrossSections;

     /// DwarfRegNumForCFI - True if dwarf register numbers are printed
     /// instead of symbolic register names in .cfi_* directives.
     bool DwarfRegNumForCFI;  // Defaults to false;

     //===--- 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;
     }

     /// getCalleeSaveStackSlotSize - Get the callee-saved register stack slot
     /// size in bytes.
     unsigned getCalleeSaveStackSlotSize() const {
       return CalleeSaveStackSlotSize;
     }

     /// 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; }

     /// 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;
     }

     bool needsDwarfSectionOffsetDirective() const {
       return NeedsDwarfSectionOffsetDirective;
     }

     // 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 *getDebugLabelSuffix() const {
       return DebugLabelSuffix;
     }

     const char *getGlobalPrefix() const {
       return GlobalPrefix;
     }
     const char *getPrivateGlobalPrefix() const {
       return PrivateGlobalPrefix;
     }
     const char *getLinkerPrivateGlobalPrefix() const {
       return LinkerPrivateGlobalPrefix;
     }
     const char *getInlineAsmStart() const {
       return InlineAsmStart;
     }
     const char *getInlineAsmEnd() const {
       return InlineAsmEnd;
     }
     const char *getCode16Directive() const {
       return Code16Directive;
     }
     const char *getCode32Directive() const {
       return Code32Directive;
     }
     const char *getCode64Directive() const {
       return Code64Directive;
     }
     unsigned getAssemblerDialect() const {
       return AssemblerDialect;
     }
     bool doesAllowQuotesInName() const {
       return AllowQuotesInName;
     }
     bool doesAllowNameToStartWithDigit() const {
       return AllowNameToStartWithDigit;
     }
     bool doesAllowPeriodsInName() const {
       return AllowPeriodsInName;
     }
     bool doesAllowUTF8() const {
       return AllowUTF8;
     }
     bool doesSupportDataRegionDirectives() const {
       return UseDataRegionDirectives;
     }
     const char *getZeroDirective() const {
       return ZeroDirective;
     }
     const char *getAsciiDirective() const {
       return AsciiDirective;
     }
     const char *getAscizDirective() const {
       return AscizDirective;
     }
     const char *getAlignDirective() const {
       return AlignDirective;
     }
     bool getAlignmentIsInBytes() const {
       return AlignmentIsInBytes;
     }
     unsigned getTextAlignFillValue() const {
       return TextAlignFillValue;
     }
     const char *getGlobalDirective() const {
       return GlobalDirective;
     }
     const char *getExternDirective() const {
       return ExternDirective;
     }
     bool hasSetDirective() const { return HasSetDirective; }
     bool hasAggressiveSymbolFolding() const {
       return HasAggressiveSymbolFolding;
     }
     bool getCOMMDirectiveAlignmentIsInBytes() const {
       return COMMDirectiveAlignmentIsInBytes;
     }
     LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
       return LCOMMDirectiveAlignmentType;
     }
     bool hasDotTypeDotSizeDirective() const {return HasDotTypeDotSizeDirective;}
     bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
     bool hasNoDeadStrip() const { return HasNoDeadStrip; }
     bool hasSymbolResolver() const { return HasSymbolResolver; }
     const char *getWeakRefDirective() const { return WeakRefDirective; }
     const char *getWeakDefDirective() const { return WeakDefDirective; }
     const char *getLinkOnceDirective() const { return LinkOnceDirective; }

     MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr;}
     MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
       return HiddenDeclarationVisibilityAttr;
     }
     MCSymbolAttr getProtectedVisibilityAttr() const {
       return ProtectedVisibilityAttr;
     }
     bool hasLEB128() const {
       return HasLEB128;
     }
     bool doesSupportDebugInformation() const {
       return SupportsDebugInformation;
     }
     bool doesSupportExceptionHandling() const {
       return ExceptionsType != ExceptionHandling::None;
     }
     ExceptionHandling::ExceptionsType getExceptionHandlingType() const {
       return ExceptionsType;
     }
     bool isExceptionHandlingDwarf() const {
       return
         (ExceptionsType == ExceptionHandling::DwarfCFI ||
          ExceptionsType == ExceptionHandling::ARM ||
          ExceptionsType == ExceptionHandling::Win64);
     }
     bool doesDwarfUseInlineInfoSection() const {
       return DwarfUsesInlineInfoSection;
     }
     bool doesDwarfUseRelocationsAcrossSections() const {
       return DwarfUsesRelocationsAcrossSections;
     }
     bool useDwarfRegNumForCFI() const {
       return DwarfRegNumForCFI;
     }

     void addInitialFrameState(MCSymbol *label, const MachineLocation &D,
                               const MachineLocation &S) {
       InitialFrameState.push_back(MachineMove(label, D, S));
     }
     const std::vector<MachineMove> &getInitialFrameState() const {
       return InitialFrameState;
     }
   };
 }

 #endif
	//===-- llvm/MC/MCAsmInfo.h - Asm info --------------------------- C++ --===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//
	//
	// This file contains a class to be used as the basis for target specific
	// asm writers. This class primarily takes care of global printing constants,
	// which are used in very similar ways across all targets.
	//
	//===----------------------------------------------------------------------===//

	#ifndef LLVM_MC_MCASMINFO_H
	#define LLVM_MC_MCASMINFO_H

	#include "llvm/MC/MCDirectives.h"
	#include "llvm/MC/MachineLocation.h"
	#include <cassert>
	#include <vector>

	namespace llvm {
	class MCExpr;
	class MCSection;
	class MCStreamer;
	class MCSymbol;
	class MCContext;

	namespace ExceptionHandling {
	enum ExceptionsType { None, DwarfCFI, SjLj, ARM, Win64 };
	}

	namespace LCOMM {
	enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
	}

	/// 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;

	/// CalleeSaveStackSlotSize - Size of the stack slot reserved for
	/// callee-saved registers, in bytes.
	/// Default is same as pointer size.
	unsigned CalleeSaveStackSlotSize;

	/// 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 ":"

	/// LabelSuffix - This is appended to emitted labels.
	const char *DebugLabelSuffix; // 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;

	/// AllowUTF8 - This is true if the assembler accepts UTF-8 input.
	// FIXME: Make this a more general encoding setting?
	bool AllowUTF8;

	/// UseDataRegionDirectives - This is true if data region markers should
	/// be printed as ".data_region/.end_data_region" directives. If false,
	/// use "$d/$a" labels instead.
	bool UseDataRegionDirectives;

	//===--- 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"

	/// 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.

	bool NeedsDwarfSectionOffsetDirective;

	//===--- 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.

	/// COMMDirectiveAlignmentIsInBytes - True is .comm's and .lcomms optional
	/// alignment is to be specified in bytes instead of log2(n).
	bool COMMDirectiveAlignmentIsInBytes; // Defaults to true;

	/// LCOMMDirectiveAlignment - Describes if the .lcomm directive for the
	/// target supports an alignment argument and how it is interpreted.
	LCOMM::LCOMMType LCOMMDirectiveAlignmentType; // Defaults to NoAlignment.

	/// 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.

	/// DwarfUsesRelocationsAcrossSections - True if Dwarf2 output generally
	/// uses relocations for references to other .debug_* sections.
	bool DwarfUsesRelocationsAcrossSections;

	/// DwarfRegNumForCFI - True if dwarf register numbers are printed
	/// instead of symbolic register names in .cfi_* directives.
	bool DwarfRegNumForCFI; // Defaults to false;

	//===--- 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;
	}

	/// getCalleeSaveStackSlotSize - Get the callee-saved register stack slot
	/// size in bytes.
	unsigned getCalleeSaveStackSlotSize() const {
	return CalleeSaveStackSlotSize;
	}

	/// 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; }

	/// 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;
	}

	bool needsDwarfSectionOffsetDirective() const {
	return NeedsDwarfSectionOffsetDirective;
	}

	// 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 *getDebugLabelSuffix() const {
	return DebugLabelSuffix;
	}

	const char *getGlobalPrefix() const {
	return GlobalPrefix;
	}
	const char *getPrivateGlobalPrefix() const {
	return PrivateGlobalPrefix;
	}
	const char *getLinkerPrivateGlobalPrefix() const {
	return LinkerPrivateGlobalPrefix;
	}
	const char *getInlineAsmStart() const {
	return InlineAsmStart;
	}
	const char *getInlineAsmEnd() const {
	return InlineAsmEnd;
	}
	const char *getCode16Directive() const {
	return Code16Directive;
	}
	const char *getCode32Directive() const {
	return Code32Directive;
	}
	const char *getCode64Directive() const {
	return Code64Directive;
	}
	unsigned getAssemblerDialect() const {
	return AssemblerDialect;
	}
	bool doesAllowQuotesInName() const {
	return AllowQuotesInName;
	}
	bool doesAllowNameToStartWithDigit() const {
	return AllowNameToStartWithDigit;
	}
	bool doesAllowPeriodsInName() const {
	return AllowPeriodsInName;
	}
	bool doesAllowUTF8() const {
	return AllowUTF8;
	}
	bool doesSupportDataRegionDirectives() const {
	return UseDataRegionDirectives;
	}
	const char *getZeroDirective() const {
	return ZeroDirective;
	}
	const char *getAsciiDirective() const {
	return AsciiDirective;
	}
	const char *getAscizDirective() const {
	return AscizDirective;
	}
	const char *getAlignDirective() const {
	return AlignDirective;
	}
	bool getAlignmentIsInBytes() const {
	return AlignmentIsInBytes;
	}
	unsigned getTextAlignFillValue() const {
	return TextAlignFillValue;
	}
	const char *getGlobalDirective() const {
	return GlobalDirective;
	}
	const char *getExternDirective() const {
	return ExternDirective;
	}
	bool hasSetDirective() const { return HasSetDirective; }
	bool hasAggressiveSymbolFolding() const {
	return HasAggressiveSymbolFolding;
	}
	bool getCOMMDirectiveAlignmentIsInBytes() const {
	return COMMDirectiveAlignmentIsInBytes;
	}
	LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
	return LCOMMDirectiveAlignmentType;
	}
	bool hasDotTypeDotSizeDirective() const {return HasDotTypeDotSizeDirective;}
	bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
	bool hasNoDeadStrip() const { return HasNoDeadStrip; }
	bool hasSymbolResolver() const { return HasSymbolResolver; }
	const char *getWeakRefDirective() const { return WeakRefDirective; }
	const char *getWeakDefDirective() const { return WeakDefDirective; }
	const char *getLinkOnceDirective() const { return LinkOnceDirective; }

	MCSymbolAttr getHiddenVisibilityAttr() const { return HiddenVisibilityAttr;}
	MCSymbolAttr getHiddenDeclarationVisibilityAttr() const {
	return HiddenDeclarationVisibilityAttr;
	}
	MCSymbolAttr getProtectedVisibilityAttr() const {
	return ProtectedVisibilityAttr;
	}
	bool hasLEB128() const {
	return HasLEB128;
	}
	bool doesSupportDebugInformation() const {
	return SupportsDebugInformation;
	}
	bool doesSupportExceptionHandling() const {
	return ExceptionsType != ExceptionHandling::None;
	}
	ExceptionHandling::ExceptionsType getExceptionHandlingType() const {
	return ExceptionsType;
	}
	bool isExceptionHandlingDwarf() const {
	return
	(ExceptionsType == ExceptionHandling::DwarfCFI \|\|
	ExceptionsType == ExceptionHandling::ARM \|\|
	ExceptionsType == ExceptionHandling::Win64);
	}
	bool doesDwarfUseInlineInfoSection() const {
	return DwarfUsesInlineInfoSection;
	}
	bool doesDwarfUseRelocationsAcrossSections() const {
	return DwarfUsesRelocationsAcrossSections;
	}
	bool useDwarfRegNumForCFI() const {
	return DwarfRegNumForCFI;
	}

	void addInitialFrameState(MCSymbol *label, const MachineLocation &D,
	const MachineLocation &S) {
	InitialFrameState.push_back(MachineMove(label, D, S));
	}
	const std::vector<MachineMove> &getInitialFrameState() const {
	return InitialFrameState;
	}
	};
	}

	#endif