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   public:
23     ARMELFWriterInfo(TargetMachine &TM);
24     virtual ~ARMELFWriterInfo();
25 
26     /// getRelocationType - Returns the target specific ELF Relocation type.
27     /// 'MachineRelTy' contains the object code independent relocation type
28     virtual unsigned getRelocationType(unsigned MachineRelTy) const;
29 
30     /// hasRelocationAddend - True if the target uses an addend in the
31     /// ELF relocation entry.
32     virtual bool hasRelocationAddend() const { return false; }
33 
34     /// getDefaultAddendForRelTy - Gets the default addend value for a
35     /// relocation entry based on the target ELF relocation type.
36     virtual long int getDefaultAddendForRelTy(unsigned RelTy,
37                                               long int Modifier = 0) const;
38 
39     /// getRelTySize - Returns the size of relocatable field in bits
40     virtual unsigned getRelocationTySize(unsigned RelTy) const;
41 
42     /// isPCRelativeRel - True if the relocation type is pc relative
43     virtual bool isPCRelativeRel(unsigned RelTy) const;
44 
45     /// getJumpTableRelocationTy - Returns the machine relocation type used
46     /// to reference a jumptable.
47     virtual unsigned getAbsoluteLabelMachineRelTy() const;
48 
49     /// computeRelocation - Some relocatable fields could be relocated
50     /// directly, avoiding the relocation symbol emission, compute the
51     /// final relocation value for this symbol.
52     virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
53                                        unsigned RelTy) const;
54   };
55 
56 } // end llvm namespace
57 
58 #endif // ARM_ELF_WRITER_INFO_H
59