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      1 //==-- llvm/CodeGen/TargetLoweringObjectFileImpl.h - Object Info -*- C++ -*-==//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file implements classes used to handle lowerings specific to common
     11 // object file formats.
     12 //
     13 //===----------------------------------------------------------------------===//
     14 
     15 #ifndef LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
     16 #define LLVM_CODEGEN_TARGETLOWERINGOBJECTFILEIMPL_H
     17 
     18 #include "llvm/ADT/StringRef.h"
     19 #include "llvm/MC/SectionKind.h"
     20 #include "llvm/Target/TargetLoweringObjectFile.h"
     21 
     22 namespace llvm {
     23   class MachineModuleInfo;
     24   class Mangler;
     25   class MCAsmInfo;
     26   class MCExpr;
     27   class MCSection;
     28   class MCSectionMachO;
     29   class MCSymbol;
     30   class MCContext;
     31   class GlobalValue;
     32   class TargetMachine;
     33 
     34 
     35 class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
     36 public:
     37   virtual ~TargetLoweringObjectFileELF() {}
     38 
     39   virtual void emitPersonalityValue(MCStreamer &Streamer,
     40                                     const TargetMachine &TM,
     41                                     const MCSymbol *Sym) const;
     42 
     43   /// getSectionForConstant - Given a constant with the SectionKind, return a
     44   /// section that it should be placed in.
     45   virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
     46 
     47 
     48   virtual const MCSection *
     49   getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
     50                            Mangler *Mang, const TargetMachine &TM) const;
     51 
     52   virtual const MCSection *
     53   SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
     54                          Mangler *Mang, const TargetMachine &TM) const;
     55 
     56   /// getExprForDwarfGlobalReference - Return an MCExpr to use for a reference
     57   /// to the specified global variable from exception handling information.
     58   ///
     59   virtual const MCExpr *
     60   getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
     61                                  MachineModuleInfo *MMI, unsigned Encoding,
     62                                  MCStreamer &Streamer) const;
     63 
     64   // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
     65   virtual MCSymbol *
     66   getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
     67                           MachineModuleInfo *MMI) const;
     68 };
     69 
     70 
     71 
     72 class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
     73 public:
     74   virtual ~TargetLoweringObjectFileMachO() {}
     75 
     76   virtual const MCSection *
     77   SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
     78                          Mangler *Mang, const TargetMachine &TM) const;
     79 
     80   virtual const MCSection *
     81   getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
     82                            Mangler *Mang, const TargetMachine &TM) const;
     83 
     84   virtual const MCSection *getSectionForConstant(SectionKind Kind) const;
     85 
     86   /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively
     87   /// decide not to emit the UsedDirective for some symbols in llvm.used.
     88   /// FIXME: REMOVE this (rdar://7071300)
     89   virtual bool shouldEmitUsedDirectiveFor(const GlobalValue *GV,
     90                                           Mangler *) const;
     91 
     92   /// getExprForDwarfGlobalReference - The mach-o version of this method
     93   /// defaults to returning a stub reference.
     94   virtual const MCExpr *
     95   getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
     96                                  MachineModuleInfo *MMI, unsigned Encoding,
     97                                  MCStreamer &Streamer) const;
     98 
     99   // getCFIPersonalitySymbol - The symbol that gets passed to .cfi_personality.
    100   virtual MCSymbol *
    101   getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
    102                           MachineModuleInfo *MMI) const;
    103 };
    104 
    105 
    106 
    107 class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
    108 public:
    109   virtual ~TargetLoweringObjectFileCOFF() {}
    110 
    111   virtual const MCSection *
    112   getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
    113                            Mangler *Mang, const TargetMachine &TM) const;
    114 
    115   virtual const MCSection *
    116   SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
    117                          Mangler *Mang, const TargetMachine &TM) const;
    118 };
    119 
    120 } // end namespace llvm
    121 
    122 #endif
    123