X86WinCOFFObjectWriter.cpp revision b21ab43cfc3fa0dacf5c95f04e58b6d804b59a16 
1//===-- X86WinCOFFObjectWriter.cpp - X86 Win COFF Writer ------------------===//
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#include "MCTargetDesc/X86FixupKinds.h"
11#include "MCTargetDesc/X86MCTargetDesc.h"
12#include "llvm/MC/MCExpr.h"
13#include "llvm/MC/MCValue.h"
14#include "llvm/MC/MCWinCOFFObjectWriter.h"
15#include "llvm/Support/COFF.h"
16#include "llvm/Support/ErrorHandling.h"
17
18using namespace llvm;
19
20namespace llvm {
21  class MCObjectWriter;
22}
23
24namespace {
25  class X86WinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
26    const bool Is64Bit;
27
28  public:
29    X86WinCOFFObjectWriter(bool Is64Bit_);
30    ~X86WinCOFFObjectWriter();
31
32    virtual unsigned getRelocType(const MCValue &Target,
33                                  const MCFixup &Fixup,
34                                  bool IsCrossSection) const LLVM_OVERRIDE;
35  };
36}
37
38X86WinCOFFObjectWriter::X86WinCOFFObjectWriter(bool Is64Bit_)
39  : MCWinCOFFObjectTargetWriter(Is64Bit_ ? COFF::IMAGE_FILE_MACHINE_AMD64 :
40                                COFF::IMAGE_FILE_MACHINE_I386),
41    Is64Bit(Is64Bit_) {}
42
43X86WinCOFFObjectWriter::~X86WinCOFFObjectWriter() {}
44
45unsigned X86WinCOFFObjectWriter::getRelocType(const MCValue &Target,
46                                              const MCFixup &Fixup,
47                                              bool IsCrossSection) const {
48  unsigned FixupKind = IsCrossSection ? FK_PCRel_4 : Fixup.getKind();
49
50  MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
51    MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
52
53  switch (FixupKind) {
54  case FK_PCRel_4:
55  case X86::reloc_riprel_4byte:
56  case X86::reloc_riprel_4byte_movq_load:
57    return Is64Bit ? COFF::IMAGE_REL_AMD64_REL32 : COFF::IMAGE_REL_I386_REL32;
58  case FK_Data_4:
59  case X86::reloc_signed_4byte:
60    if (Modifier == MCSymbolRefExpr::VK_COFF_IMGREL32)
61      return Is64Bit ? COFF::IMAGE_REL_AMD64_ADDR32NB :
62                       COFF::IMAGE_REL_I386_DIR32NB;
63    return Is64Bit ? COFF::IMAGE_REL_AMD64_ADDR32 : COFF::IMAGE_REL_I386_DIR32;
64  case FK_Data_8:
65    if (Is64Bit)
66      return COFF::IMAGE_REL_AMD64_ADDR64;
67    llvm_unreachable("unsupported relocation type");
68  case FK_SecRel_4:
69    return Is64Bit ? COFF::IMAGE_REL_AMD64_SECREL : COFF::IMAGE_REL_I386_SECREL;
70  default:
71    llvm_unreachable("unsupported relocation type");
72  }
73}
74
75MCObjectWriter *llvm::createX86WinCOFFObjectWriter(raw_ostream &OS,
76                                                   bool Is64Bit) {
77  MCWinCOFFObjectTargetWriter *MOTW = new X86WinCOFFObjectWriter(Is64Bit);
78  return createWinCOFFObjectWriter(MOTW, OS);
79}
80