contrib/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFObjectWriter.cpp

   1 //===-- ARMWinCOFFObjectWriter.cpp - ARM Windows COFF 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 #include "MCTargetDesc/ARMFixupKinds.h"
  11 #include "llvm/ADT/Twine.h"
  12 #include "llvm/MC/MCAsmBackend.h"
  13 #include "llvm/MC/MCExpr.h"
  14 #include "llvm/MC/MCFixup.h"
  15 #include "llvm/MC/MCFixupKindInfo.h"
  16 #include "llvm/MC/MCValue.h"
  17 #include "llvm/MC/MCWinCOFFObjectWriter.h"
  18 #include "llvm/Support/COFF.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include <cassert>
  22
  23 using namespace llvm;
  24
  25 namespace {
  26
  27 class ARMWinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
  28 public:
  29   ARMWinCOFFObjectWriter(bool Is64Bit)
  30     : MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARMNT) {
  31     assert(!Is64Bit && "AArch64 support not yet implemented");
  32   }
  33
  34   ~ARMWinCOFFObjectWriter() override = default;
  35
  36   unsigned getRelocType(const MCValue &Target, const MCFixup &Fixup,
  37                         bool IsCrossSection,
  38                         const MCAsmBackend &MAB) const override;
  39
  40   bool recordRelocation(const MCFixup &) const override;
  41 };
  42
  43 } // end anonymous namespace
  44
  45 unsigned ARMWinCOFFObjectWriter::getRelocType(const MCValue &Target,
  46                                               const MCFixup &Fixup,
  47                                               bool IsCrossSection,
  48                                               const MCAsmBackend &MAB) const {
  49   assert(getMachine() == COFF::IMAGE_FILE_MACHINE_ARMNT &&
  50          "AArch64 support not yet implemented");
  51
  52   MCSymbolRefExpr::VariantKind Modifier =
  53     Target.isAbsolute() ? MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
  54
  55   switch (static_cast<unsigned>(Fixup.getKind())) {
  56   default: {
  57     const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
  58     report_fatal_error(Twine("unsupported relocation type: ") + Info.Name);
  59   }
  60   case FK_Data_4:
  61     switch (Modifier) {
  62     case MCSymbolRefExpr::VK_COFF_IMGREL32:
  63       return COFF::IMAGE_REL_ARM_ADDR32NB;
  64     case MCSymbolRefExpr::VK_SECREL:
  65       return COFF::IMAGE_REL_ARM_SECREL;
  66     default:
  67       return COFF::IMAGE_REL_ARM_ADDR32;
  68     }
  69   case FK_SecRel_2:
  70     return COFF::IMAGE_REL_ARM_SECTION;
  71   case FK_SecRel_4:
  72     return COFF::IMAGE_REL_ARM_SECREL;
  73   case ARM::fixup_t2_condbranch:
  74     return COFF::IMAGE_REL_ARM_BRANCH20T;
  75   case ARM::fixup_t2_uncondbranch:
  76     return COFF::IMAGE_REL_ARM_BRANCH24T;
  77   case ARM::fixup_arm_thumb_bl:
  78   case ARM::fixup_arm_thumb_blx:
  79     return COFF::IMAGE_REL_ARM_BLX23T;
  80   case ARM::fixup_t2_movw_lo16:
  81   case ARM::fixup_t2_movt_hi16:
  82     return COFF::IMAGE_REL_ARM_MOV32T;
  83   }
  84 }
  85
  86 bool ARMWinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
  87   return static_cast<unsigned>(Fixup.getKind()) != ARM::fixup_t2_movt_hi16;
  88 }
  89
  90 namespace llvm {
  91
  92 MCObjectWriter *createARMWinCOFFObjectWriter(raw_pwrite_stream &OS,
  93                                              bool Is64Bit) {
  94   MCWinCOFFObjectTargetWriter *MOTW = new ARMWinCOFFObjectWriter(Is64Bit);
  95   return createWinCOFFObjectWriter(MOTW, OS);
  96 }
  97
  98 } // end namespace llvm