include/llvm/Target/TargetLoweringObjectFile.h - fp2-dev/platform/external/llvm - Gitiles

 //===-- llvm/Target/TargetLoweringObjectFile.h - Object 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 implements classes used to handle lowerings specific to common
 // object file formats.
 //
 //===----------------------------------------------------------------------===//

 #ifndef LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
 #define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H

 #include "llvm/ADT/StringRef.h"
 #include "llvm/MC/SectionKind.h"

 namespace llvm {
   class MachineModuleInfo;
   class Mangler;
   class MCAsmInfo;
   class MCContext;
   class MCExpr;
   class MCSection;
   class MCSectionMachO;
   class MCSymbol;
   class MCStreamer;
   class GlobalValue;
   class TargetMachine;

 class TargetLoweringObjectFile {
   MCContext *Ctx;

   TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
   void operator=(const TargetLoweringObjectFile&);           // DO NOT IMPLEMENT
 protected:

   TargetLoweringObjectFile();

   /// TextSection - Section directive for standard text.
   ///
   const MCSection *TextSection;

   /// DataSection - Section directive for standard data.
   ///
   const MCSection *DataSection;

   /// BSSSection - Section that is default initialized to zero.
   const MCSection *BSSSection;

   /// ReadOnlySection - Section that is readonly and can contain arbitrary
   /// initialized data.  Targets are not required to have a readonly section.
   /// If they don't, various bits of code will fall back to using the data
   /// section for constants.
   const MCSection *ReadOnlySection;

   /// StaticCtorSection - This section contains the static constructor pointer
   /// list.
   const MCSection *StaticCtorSection;

   /// StaticDtorSection - This section contains the static destructor pointer
   /// list.
   const MCSection *StaticDtorSection;

   /// LSDASection - If exception handling is supported by the target, this is
   /// the section the Language Specific Data Area information is emitted to.
   const MCSection *LSDASection;

   /// CompactUnwindSection - If exception handling is supported by the target
   /// and the target can support a compact representation of the CIE and FDE,
   /// this is the section to emit them into.
   const MCSection *CompactUnwindSection;

   // Dwarf sections for debug info.  If a target supports debug info, these must
   // be set.
   const MCSection *DwarfAbbrevSection;
   const MCSection *DwarfInfoSection;
   const MCSection *DwarfLineSection;
   const MCSection *DwarfFrameSection;
   const MCSection *DwarfPubNamesSection;
   const MCSection *DwarfPubTypesSection;
   const MCSection *DwarfDebugInlineSection;
   const MCSection *DwarfStrSection;
   const MCSection *DwarfLocSection;
   const MCSection *DwarfARangesSection;
   const MCSection *DwarfRangesSection;
   const MCSection *DwarfMacroInfoSection;

   // Extra TLS Variable Data section.  If the target needs to put additional
   // information for a TLS variable, it'll go here.
   const MCSection *TLSExtraDataSection;

   /// CommDirectiveSupportsAlignment - True if .comm supports alignment.  This
   /// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't
   /// support alignment on comm.
   bool CommDirectiveSupportsAlignment;

   /// SupportsWeakEmptyEHFrame - True if target object file supports a
   /// weak_definition of constant 0 for an omitted EH frame.
   bool SupportsWeakOmittedEHFrame;

   /// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
   /// "EH_frame" symbol for EH information should be an assembler temporary (aka
   /// private linkage, aka an L or .L label) or false if it should be a normal
   /// non-.globl label.  This defaults to true.
   bool IsFunctionEHFrameSymbolPrivate;

 public:
   MCContext &getContext() const { return *Ctx; }

   virtual ~TargetLoweringObjectFile();

   /// Initialize - this method must be called before any actual lowering is
   /// done.  This specifies the current context for codegen, and gives the
   /// lowering implementations a chance to set up their default sections.
   virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
     Ctx = &ctx;
   }

   bool isFunctionEHFrameSymbolPrivate() const {
     return IsFunctionEHFrameSymbolPrivate;
   }
   bool getSupportsWeakOmittedEHFrame() const {
     return SupportsWeakOmittedEHFrame;
   }
   bool getCommDirectiveSupportsAlignment() const {
     return CommDirectiveSupportsAlignment;
   }

   const MCSection *getTextSection() const { return TextSection; }
   const MCSection *getDataSection() const { return DataSection; }
   const MCSection *getBSSSection() const { return BSSSection; }
   const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
   const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
   const MCSection *getLSDASection() const { return LSDASection; }
   const MCSection *getCompactUnwindSection() const{return CompactUnwindSection;}
   virtual const MCSection *getEHFrameSection() const = 0;
   virtual void emitPersonalityValue(MCStreamer &Streamer,
                                     const TargetMachine &TM,
                                     const MCSymbol *Sym) const;
   const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
   const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
   const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
   const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
   const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
   const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
   const MCSection *getDwarfDebugInlineSection() const {
     return DwarfDebugInlineSection;
   }
   const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
   const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
   const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
   const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
   const MCSection *getDwarfMacroInfoSection() const {
     return DwarfMacroInfoSection;
   }
   const MCSection *getTLSExtraDataSection() const {
     return TLSExtraDataSection;
   }
   virtual const MCSection *getWin64EHFuncTableSection(StringRef suffix)const=0;
   virtual const MCSection *getWin64EHTableSection(StringRef suffix) const = 0;

   /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
   /// decide not to emit the UsedDirective for some symbols in llvm.used.
   /// FIXME: REMOVE this (rdar://7071300)
   virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
                                           Mangler *) const {
     return GV != 0;
   }

   /// getSectionForConstant - Given a constant with the SectionKind, return a
   /// section that it should be placed in.
   virtual const MCSection *getSectionForConstant(SectionKind Kind) const;

   /// getKindForGlobal - Classify the specified global variable into a set of
   /// target independent categories embodied in SectionKind.
   static SectionKind getKindForGlobal(const GlobalValue *GV,
                                       const TargetMachine &TM);

   /// SectionForGlobal - This method computes the appropriate section to emit
   /// the specified global variable or function definition.  This should not
   /// be passed external (or available externally) globals.
   const MCSection *SectionForGlobal(const GlobalValue *GV,
                                     SectionKind Kind, Mangler *Mang,
                                     const TargetMachine &TM) const;

   /// SectionForGlobal - This method computes the appropriate section to emit
   /// the specified global variable or function definition.  This should not
   /// be passed external (or available externally) globals.
   const MCSection *SectionForGlobal(const GlobalValue *GV,
                                     Mangler *Mang,
                                     const TargetMachine &TM) const {
     return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
   }


   /// getExplicitSectionGlobal - Targets should implement this method to assign
   /// a section to globals with an explicit section specfied.  The
   /// implementation of this method can assume that GV->hasSection() is true.
   virtual const MCSection *
   getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
                            Mangler *Mang, const TargetMachine &TM) const = 0;

   /// getSpecialCasedSectionGlobals - Allow the target to completely override
   /// section assignment of a global.
   virtual const MCSection *
   getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
                                 SectionKind Kind) const {
     return 0;
   }

   /// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
   /// to the specified global variable from exception handling information.
   ///
   virtual const MCExpr *
   getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
                                  MachineModuleInfo *MMI, unsigned Encoding,
                                  MCStreamer &Streamer) const;

   // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
   virtual MCSymbol *
   getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
                           MachineModuleInfo *MMI) const;

   ///
   const MCExpr *
   getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
                            MCStreamer &Streamer) const;

   virtual unsigned getPersonalityEncoding() const;
   virtual unsigned getLSDAEncoding() const;
   virtual unsigned getFDEEncoding(bool CFI) const;
   virtual unsigned getTTypeEncoding() const;

 protected:
   virtual const MCSection *
   SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
                          Mangler *Mang, const TargetMachine &TM) const;
 };

 } // end namespace llvm

 #endif
	//===-- llvm/Target/TargetLoweringObjectFile.h - Object 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 implements classes used to handle lowerings specific to common
	// object file formats.
	//
	//===----------------------------------------------------------------------===//

	#ifndef LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
	#define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H

	#include "llvm/ADT/StringRef.h"
	#include "llvm/MC/SectionKind.h"

	namespace llvm {
	class MachineModuleInfo;
	class Mangler;
	class MCAsmInfo;
	class MCContext;
	class MCExpr;
	class MCSection;
	class MCSectionMachO;
	class MCSymbol;
	class MCStreamer;
	class GlobalValue;
	class TargetMachine;

	class TargetLoweringObjectFile {
	MCContext *Ctx;

	TargetLoweringObjectFile(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
	void operator=(const TargetLoweringObjectFile&); // DO NOT IMPLEMENT
	protected:

	TargetLoweringObjectFile();

	/// TextSection - Section directive for standard text.
	///
	const MCSection *TextSection;

	/// DataSection - Section directive for standard data.
	///
	const MCSection *DataSection;

	/// BSSSection - Section that is default initialized to zero.
	const MCSection *BSSSection;

	/// ReadOnlySection - Section that is readonly and can contain arbitrary
	/// initialized data. Targets are not required to have a readonly section.
	/// If they don't, various bits of code will fall back to using the data
	/// section for constants.
	const MCSection *ReadOnlySection;

	/// StaticCtorSection - This section contains the static constructor pointer
	/// list.
	const MCSection *StaticCtorSection;

	/// StaticDtorSection - This section contains the static destructor pointer
	/// list.
	const MCSection *StaticDtorSection;

	/// LSDASection - If exception handling is supported by the target, this is
	/// the section the Language Specific Data Area information is emitted to.
	const MCSection *LSDASection;

	/// CompactUnwindSection - If exception handling is supported by the target
	/// and the target can support a compact representation of the CIE and FDE,
	/// this is the section to emit them into.
	const MCSection *CompactUnwindSection;

	// Dwarf sections for debug info. If a target supports debug info, these must
	// be set.
	const MCSection *DwarfAbbrevSection;
	const MCSection *DwarfInfoSection;
	const MCSection *DwarfLineSection;
	const MCSection *DwarfFrameSection;
	const MCSection *DwarfPubNamesSection;
	const MCSection *DwarfPubTypesSection;
	const MCSection *DwarfDebugInlineSection;
	const MCSection *DwarfStrSection;
	const MCSection *DwarfLocSection;
	const MCSection *DwarfARangesSection;
	const MCSection *DwarfRangesSection;
	const MCSection *DwarfMacroInfoSection;

	// Extra TLS Variable Data section. If the target needs to put additional
	// information for a TLS variable, it'll go here.
	const MCSection *TLSExtraDataSection;

	/// CommDirectiveSupportsAlignment - True if .comm supports alignment. This
	/// is a hack for as long as we support 10.4 Tiger, whose assembler doesn't
	/// support alignment on comm.
	bool CommDirectiveSupportsAlignment;

	/// SupportsWeakEmptyEHFrame - True if target object file supports a
	/// weak_definition of constant 0 for an omitted EH frame.
	bool SupportsWeakOmittedEHFrame;

	/// IsFunctionEHFrameSymbolPrivate - This flag is set to true if the
	/// "EH_frame" symbol for EH information should be an assembler temporary (aka
	/// private linkage, aka an L or .L label) or false if it should be a normal
	/// non-.globl label. This defaults to true.
	bool IsFunctionEHFrameSymbolPrivate;

	public:
	MCContext &getContext() const { return *Ctx; }

	virtual ~TargetLoweringObjectFile();

	/// Initialize - this method must be called before any actual lowering is
	/// done. This specifies the current context for codegen, and gives the
	/// lowering implementations a chance to set up their default sections.
	virtual void Initialize(MCContext &ctx, const TargetMachine &TM) {
	Ctx = &ctx;
	}

	bool isFunctionEHFrameSymbolPrivate() const {
	return IsFunctionEHFrameSymbolPrivate;
	}
	bool getSupportsWeakOmittedEHFrame() const {
	return SupportsWeakOmittedEHFrame;
	}
	bool getCommDirectiveSupportsAlignment() const {
	return CommDirectiveSupportsAlignment;
	}

	const MCSection *getTextSection() const { return TextSection; }
	const MCSection *getDataSection() const { return DataSection; }
	const MCSection *getBSSSection() const { return BSSSection; }
	const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
	const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
	const MCSection *getLSDASection() const { return LSDASection; }
	const MCSection *getCompactUnwindSection() const{return CompactUnwindSection;}
	virtual const MCSection *getEHFrameSection() const = 0;
	virtual void emitPersonalityValue(MCStreamer &Streamer,
	const TargetMachine &TM,
	const MCSymbol *Sym) const;
	const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
	const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
	const MCSection *getDwarfLineSection() const { return DwarfLineSection; }
	const MCSection *getDwarfFrameSection() const { return DwarfFrameSection; }
	const MCSection *getDwarfPubNamesSection() const{return DwarfPubNamesSection;}
	const MCSection *getDwarfPubTypesSection() const{return DwarfPubTypesSection;}
	const MCSection *getDwarfDebugInlineSection() const {
	return DwarfDebugInlineSection;
	}
	const MCSection *getDwarfStrSection() const { return DwarfStrSection; }
	const MCSection *getDwarfLocSection() const { return DwarfLocSection; }
	const MCSection *getDwarfARangesSection() const { return DwarfARangesSection;}
	const MCSection *getDwarfRangesSection() const { return DwarfRangesSection; }
	const MCSection *getDwarfMacroInfoSection() const {
	return DwarfMacroInfoSection;
	}
	const MCSection *getTLSExtraDataSection() const {
	return TLSExtraDataSection;
	}
	virtual const MCSection *getWin64EHFuncTableSection(StringRef suffix)const=0;
	virtual const MCSection *getWin64EHTableSection(StringRef suffix) const = 0;

	/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
	/// decide not to emit the UsedDirective for some symbols in llvm.used.
	/// FIXME: REMOVE this (rdar://7071300)
	virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
	Mangler *) const {
	return GV != 0;
	}

	/// getSectionForConstant - Given a constant with the SectionKind, return a
	/// section that it should be placed in.
	virtual const MCSection *getSectionForConstant(SectionKind Kind) const;

	/// getKindForGlobal - Classify the specified global variable into a set of
	/// target independent categories embodied in SectionKind.
	static SectionKind getKindForGlobal(const GlobalValue *GV,
	const TargetMachine &TM);

	/// SectionForGlobal - This method computes the appropriate section to emit
	/// the specified global variable or function definition. This should not
	/// be passed external (or available externally) globals.
	const MCSection SectionForGlobal(const GlobalValue GV,
	SectionKind Kind, Mangler *Mang,
	const TargetMachine &TM) const;

	/// SectionForGlobal - This method computes the appropriate section to emit
	/// the specified global variable or function definition. This should not
	/// be passed external (or available externally) globals.
	const MCSection SectionForGlobal(const GlobalValue GV,
	Mangler *Mang,
	const TargetMachine &TM) const {
	return SectionForGlobal(GV, getKindForGlobal(GV, TM), Mang, TM);
	}



	/// getExplicitSectionGlobal - Targets should implement this method to assign
	/// a section to globals with an explicit section specfied. The
	/// implementation of this method can assume that GV->hasSection() is true.
	virtual const MCSection *
	getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
	Mangler *Mang, const TargetMachine &TM) const = 0;

	/// getSpecialCasedSectionGlobals - Allow the target to completely override
	/// section assignment of a global.
	virtual const MCSection *
	getSpecialCasedSectionGlobals(const GlobalValue GV, Mangler Mang,
	SectionKind Kind) const {
	return 0;
	}

	/// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
	/// to the specified global variable from exception handling information.
	///
	virtual const MCExpr *
	getExprForDwarfGlobalReference(const GlobalValue GV, Mangler Mang,
	MachineModuleInfo *MMI, unsigned Encoding,
	MCStreamer &Streamer) const;

	// getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
	virtual MCSymbol *
	getCFIPersonalitySymbol(const GlobalValue GV, Mangler Mang,
	MachineModuleInfo *MMI) const;

	///
	const MCExpr *
	getExprForDwarfReference(const MCSymbol *Sym, unsigned Encoding,
	MCStreamer &Streamer) const;

	virtual unsigned getPersonalityEncoding() const;
	virtual unsigned getLSDAEncoding() const;
	virtual unsigned getFDEEncoding(bool CFI) const;
	virtual unsigned getTTypeEncoding() const;

	protected:
	virtual const MCSection *
	SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
	Mangler *Mang, const TargetMachine &TM) const;
	};

	} // end namespace llvm

	#endif