MCELFObjectWriter.h revision 69bbda03918a18bd4477bb254d51346ee3033567 
1//===-- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ---------*- 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#ifndef LLVM_MC_MCELFOBJECTWRITER_H
11#define LLVM_MC_MCELFOBJECTWRITER_H
12
13#include "llvm/MC/MCObjectWriter.h"
14#include "llvm/Support/DataTypes.h"
15#include "llvm/Support/ELF.h"
16
17namespace llvm {
18class MCELFObjectTargetWriter {
19  const uint8_t OSABI;
20  const uint16_t EMachine;
21  const unsigned HasRelocationAddend : 1;
22  const unsigned Is64Bit : 1;
23
24protected:
25
26  MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
27                          uint16_t EMachine_,  bool HasRelocationAddend_);
28
29public:
30  static uint8_t getOSABI(Triple::OSType OSType) {
31    switch (OSType) {
32      case Triple::FreeBSD:
33        return ELF::ELFOSABI_FREEBSD;
34      case Triple::Linux:
35        return ELF::ELFOSABI_LINUX;
36      default:
37        return ELF::ELFOSABI_NONE;
38    }
39  }
40
41  virtual ~MCELFObjectTargetWriter();
42
43  virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
44                                bool IsPCRel, bool IsRelocWithSymbol,
45                                int64_t Addend) const; // FIXME: add = 0
46  virtual unsigned getEFlags() const;
47  virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
48                                         const MCValue &Target,
49                                         const MCFragment &F,
50                                         const MCFixup &Fixup,
51                                         bool IsPCRel) const;
52
53  /// @name Accessors
54  /// @{
55  uint8_t getOSABI() { return OSABI; }
56  uint16_t getEMachine() { return EMachine; }
57  bool hasRelocationAddend() { return HasRelocationAddend; }
58  bool is64Bit() const { return Is64Bit; }
59  /// @}
60};
61
62/// \brief Construct a new ELF writer instance.
63///
64/// \param MOTW - The target specific ELF writer subclass.
65/// \param OS - The stream to write to.
66/// \returns The constructed object writer.
67MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
68                                      raw_ostream &OS, bool IsLittleEndian);
69} // End llvm namespace
70
71#endif
72