lib/Target/ARM/ARMELFWriterInfo.h

   1 //===-- ARMELFWriterInfo.h - ELF Writer Info for ARM ------------*- 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 ELF writer information for the ARM backend.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ARM_ELF_WRITER_INFO_H
  15 #define ARM_ELF_WRITER_INFO_H
  16
  17 #include "llvm/Target/TargetELFWriterInfo.h"
  18
  19 namespace llvm {
  20
  21   class ARMELFWriterInfo : public TargetELFWriterInfo {
  22
  23     // ELF Relocation types for ARM
  24     // FIXME: TODO(jasonwkim): [2010/09/17 14:52:25 PDT (Friday)]
  25     // Come up with a better way to orgnize the 100+ ARM reloc types.
  26
  27     enum ARMRelocationType {
  28     };
  29
  30   public:
  31     ARMELFWriterInfo(TargetMachine &TM);
  32     virtual ~ARMELFWriterInfo();
  33
  34     /// getRelocationType - Returns the target specific ELF Relocation type.
  35     /// 'MachineRelTy' contains the object code independent relocation type
  36     virtual unsigned getRelocationType(unsigned MachineRelTy) const;
  37
  38     /// hasRelocationAddend - True if the target uses an addend in the
  39     /// ELF relocation entry.
  40     virtual bool hasRelocationAddend() const { return false; }
  41
  42     /// getDefaultAddendForRelTy - Gets the default addend value for a
  43     /// relocation entry based on the target ELF relocation type.
  44     virtual long int getDefaultAddendForRelTy(unsigned RelTy,
  45                                               long int Modifier = 0) const;
  46
  47     /// getRelTySize - Returns the size of relocatable field in bits
  48     virtual unsigned getRelocationTySize(unsigned RelTy) const;
  49
  50     /// isPCRelativeRel - True if the relocation type is pc relative
  51     virtual bool isPCRelativeRel(unsigned RelTy) const;
  52
  53     /// getJumpTableRelocationTy - Returns the machine relocation type used
  54     /// to reference a jumptable.
  55     virtual unsigned getAbsoluteLabelMachineRelTy() const;
  56
  57     /// computeRelocation - Some relocatable fields could be relocated
  58     /// directly, avoiding the relocation symbol emission, compute the
  59     /// final relocation value for this symbol.
  60     virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
  61                                        unsigned RelTy) const;
  62   };
  63
  64 } // end llvm namespace
  65
  66 #endif // ARM_ELF_WRITER_INFO_H