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
19namespace 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.
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