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      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 
     18 using namespace llvm;
     19 
     20 namespace llvm {
     21   class MCObjectWriter;
     22 }
     23 
     24 namespace {
     25   class X86WinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
     26   public:
     27     X86WinCOFFObjectWriter(bool Is64Bit);
     28     ~X86WinCOFFObjectWriter() override;
     29 
     30     unsigned getRelocType(const MCValue &Target, const MCFixup &Fixup,
     31                           bool IsCrossSection,
     32                           const MCAsmBackend &MAB) const override;
     33   };
     34 }
     35 
     36 X86WinCOFFObjectWriter::X86WinCOFFObjectWriter(bool Is64Bit)
     37     : MCWinCOFFObjectTargetWriter(Is64Bit ? COFF::IMAGE_FILE_MACHINE_AMD64
     38                                           : COFF::IMAGE_FILE_MACHINE_I386) {}
     39 
     40 X86WinCOFFObjectWriter::~X86WinCOFFObjectWriter() {}
     41 
     42 unsigned X86WinCOFFObjectWriter::getRelocType(const MCValue &Target,
     43                                               const MCFixup &Fixup,
     44                                               bool IsCrossSection,
     45                                               const MCAsmBackend &MAB) const {
     46   unsigned FixupKind = IsCrossSection ? FK_PCRel_4 : Fixup.getKind();
     47 
     48   MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
     49     MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
     50 
     51   if (getMachine() == COFF::IMAGE_FILE_MACHINE_AMD64) {
     52     switch (FixupKind) {
     53     case FK_PCRel_4:
     54     case X86::reloc_riprel_4byte:
     55     case X86::reloc_riprel_4byte_movq_load:
     56       return COFF::IMAGE_REL_AMD64_REL32;
     57     case FK_Data_4:
     58     case X86::reloc_signed_4byte:
     59       if (Modifier == MCSymbolRefExpr::VK_COFF_IMGREL32)
     60         return COFF::IMAGE_REL_AMD64_ADDR32NB;
     61       return COFF::IMAGE_REL_AMD64_ADDR32;
     62     case FK_Data_8:
     63       return COFF::IMAGE_REL_AMD64_ADDR64;
     64     case FK_SecRel_2:
     65       return COFF::IMAGE_REL_AMD64_SECTION;
     66     case FK_SecRel_4:
     67       return COFF::IMAGE_REL_AMD64_SECREL;
     68     default:
     69       llvm_unreachable("unsupported relocation type");
     70     }
     71   } else if (getMachine() == COFF::IMAGE_FILE_MACHINE_I386) {
     72     switch (FixupKind) {
     73     case FK_PCRel_4:
     74     case X86::reloc_riprel_4byte:
     75     case X86::reloc_riprel_4byte_movq_load:
     76       return COFF::IMAGE_REL_I386_REL32;
     77     case FK_Data_4:
     78     case X86::reloc_signed_4byte:
     79       if (Modifier == MCSymbolRefExpr::VK_COFF_IMGREL32)
     80         return COFF::IMAGE_REL_I386_DIR32NB;
     81       return COFF::IMAGE_REL_I386_DIR32;
     82     case FK_SecRel_2:
     83       return COFF::IMAGE_REL_I386_SECTION;
     84     case FK_SecRel_4:
     85       return COFF::IMAGE_REL_I386_SECREL;
     86     default:
     87       llvm_unreachable("unsupported relocation type");
     88     }
     89   } else
     90     llvm_unreachable("Unsupported COFF machine type.");
     91 }
     92 
     93 MCObjectWriter *llvm::createX86WinCOFFObjectWriter(raw_pwrite_stream &OS,
     94                                                    bool Is64Bit) {
     95   MCWinCOFFObjectTargetWriter *MOTW = new X86WinCOFFObjectWriter(Is64Bit);
     96   return createWinCOFFObjectWriter(MOTW, OS);
     97 }
     98