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1 //===-- X86ELFWriterInfo.h - ELF Writer Info for X86 ------------*- 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 X86 backend.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef X86_ELF_WRITER_INFO_H
15 #define X86_ELF_WRITER_INFO_H
16 
17 #include "llvm/Target/TargetELFWriterInfo.h"
18 
19 namespace llvm {
20 
21   class X86ELFWriterInfo : public TargetELFWriterInfo {
22 
23   public:
24     X86ELFWriterInfo(bool is64Bit_, bool isLittleEndian_);
25     virtual ~X86ELFWriterInfo();
26 
27     /// getRelocationType - Returns the target specific ELF Relocation type.
28     /// 'MachineRelTy' contains the object code independent relocation type
29     virtual unsigned getRelocationType(unsigned MachineRelTy) const;
30 
31     /// hasRelocationAddend - True if the target uses an addend in the
32     /// ELF relocation entry.
hasRelocationAddend()33     virtual bool hasRelocationAddend() const { return is64Bit ? true : false; }
34 
35     /// getDefaultAddendForRelTy - Gets the default addend value for a
36     /// relocation entry based on the target ELF relocation type.
37     virtual long int getDefaultAddendForRelTy(unsigned RelTy,
38                                               long int Modifier = 0) const;
39 
40     /// getRelTySize - Returns the size of relocatable field in bits
41     virtual unsigned getRelocationTySize(unsigned RelTy) const;
42 
43     /// isPCRelativeRel - True if the relocation type is pc relative
44     virtual bool isPCRelativeRel(unsigned RelTy) const;
45 
46     /// getJumpTableRelocationTy - Returns the machine relocation type used
47     /// to reference a jumptable.
48     virtual unsigned getAbsoluteLabelMachineRelTy() const;
49 
50     /// computeRelocation - Some relocatable fields could be relocated
51     /// directly, avoiding the relocation symbol emission, compute the
52     /// final relocation value for this symbol.
53     virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset,
54                                        unsigned RelTy) const;
55   };
56 
57 } // end llvm namespace
58 
59 #endif // X86_ELF_WRITER_INFO_H
60