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