tools/llvm-readobj/COFFDumper.cpp

   1 //===-- COFFDumper.cpp - COFF-specific dumper -------------------*- 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 /// \file
  11 /// \brief This file implements the COFF-specific dumper for llvm-readobj.
  12 ///
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm-readobj.h"
  16 #include "ARMWinEHPrinter.h"
  17 #include "Error.h"
  18 #include "ObjDumper.h"
  19 #include "StreamWriter.h"
  20 #include "Win64EHDumper.h"
  21 #include "llvm/ADT/DenseMap.h"
  22 #include "llvm/ADT/SmallString.h"
  23 #include "llvm/Object/COFF.h"
  24 #include "llvm/Object/ObjectFile.h"
  25 #include "llvm/Support/COFF.h"
  26 #include "llvm/Support/Casting.h"
  27 #include "llvm/Support/Compiler.h"
  28 #include "llvm/Support/DataExtractor.h"
  29 #include "llvm/Support/Format.h"
  30 #include "llvm/Support/SourceMgr.h"
  31 #include "llvm/Support/Win64EH.h"
  32 #include "llvm/Support/raw_ostream.h"
  33 #include <algorithm>
  34 #include <cstring>
  35 #include <system_error>
  36 #include <time.h>
  37
  38 using namespace llvm;
  39 using namespace llvm::object;
  40 using namespace llvm::Win64EH;
  41
  42 namespace {
  43
  44 class COFFDumper : public ObjDumper {
  45 public:
  46   COFFDumper(const llvm::object::COFFObjectFile *Obj, StreamWriter& Writer)
  47     : ObjDumper(Writer)
  48     , Obj(Obj) {
  49     cacheRelocations();
  50   }
  51
  52   void printFileHeaders() override;
  53   void printSections() override;
  54   void printRelocations() override;
  55   void printSymbols() override;
  56   void printDynamicSymbols() override;
  57   void printUnwindInfo() override;
  58   void printCOFFImports() override;
  59
  60 private:
  61   void printSymbol(const SymbolRef &Sym);
  62   void printRelocation(const SectionRef &Section, const RelocationRef &Reloc);
  63   void printDataDirectory(uint32_t Index, const std::string &FieldName);
  64
  65   template <class PEHeader> void printPEHeader(const PEHeader *Hdr);
  66   void printBaseOfDataField(const pe32_header *Hdr);
  67   void printBaseOfDataField(const pe32plus_header *Hdr);
  68
  69   void printCodeViewLineTables(const SectionRef &Section);
  70
  71   void cacheRelocations();
  72
  73   std::error_code resolveSymbol(const coff_section *Section, uint64_t Offset,
  74                                 SymbolRef &Sym);
  75   std::error_code resolveSymbolName(const coff_section *Section,
  76                                     uint64_t Offset, StringRef &Name);
  77
  78   typedef DenseMap<const coff_section*, std::vector<RelocationRef> > RelocMapTy;
  79
  80   const llvm::object::COFFObjectFile *Obj;
  81   RelocMapTy RelocMap;
  82 };
  83
  84 } // namespace
  85
  86
  87 namespace llvm {
  88
  89 std::error_code createCOFFDumper(const object::ObjectFile *Obj,
  90                                  StreamWriter &Writer,
  91                                  std::unique_ptr<ObjDumper> &Result) {
  92   const COFFObjectFile *COFFObj = dyn_cast<COFFObjectFile>(Obj);
  93   if (!COFFObj)
  94     return readobj_error::unsupported_obj_file_format;
  95
  96   Result.reset(new COFFDumper(COFFObj, Writer));
  97   return readobj_error::success;
  98 }
  99
 100 } // namespace llvm
 101
 102 // Given a a section and an offset into this section the function returns the
 103 // symbol used for the relocation at the offset.
 104 std::error_code COFFDumper::resolveSymbol(const coff_section *Section,
 105                                           uint64_t Offset, SymbolRef &Sym) {
 106   const auto &Relocations = RelocMap[Section];
 107   for (const auto &Relocation : Relocations) {
 108     uint64_t RelocationOffset;
 109     if (std::error_code EC = Relocation.getOffset(RelocationOffset))
 110       return EC;
 111
 112     if (RelocationOffset == Offset) {
 113       Sym = *Relocation.getSymbol();
 114       return readobj_error::success;
 115     }
 116   }
 117   return readobj_error::unknown_symbol;
 118 }
 119
 120 // Given a section and an offset into this section the function returns the name
 121 // of the symbol used for the relocation at the offset.
 122 std::error_code COFFDumper::resolveSymbolName(const coff_section *Section,
 123                                               uint64_t Offset,
 124                                               StringRef &Name) {
 125   SymbolRef Symbol;
 126   if (std::error_code EC = resolveSymbol(Section, Offset, Symbol))
 127     return EC;
 128   if (std::error_code EC = Symbol.getName(Name))
 129     return EC;
 130   return object_error::success;
 131 }
 132
 133 static const EnumEntry<COFF::MachineTypes> ImageFileMachineType[] = {
 134   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_UNKNOWN  ),
 135   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_AM33     ),
 136   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_AMD64    ),
 137   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_ARM      ),
 138   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_ARMNT    ),
 139   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_EBC      ),
 140   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_I386     ),
 141   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_IA64     ),
 142   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_M32R     ),
 143   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_MIPS16   ),
 144   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_MIPSFPU  ),
 145   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_MIPSFPU16),
 146   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_POWERPC  ),
 147   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_POWERPCFP),
 148   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_R4000    ),
 149   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_SH3      ),
 150   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_SH3DSP   ),
 151   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_SH4      ),
 152   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_SH5      ),
 153   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_THUMB    ),
 154   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_MACHINE_WCEMIPSV2)
 155 };
 156
 157 static const EnumEntry<COFF::Characteristics> ImageFileCharacteristics[] = {
 158   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_RELOCS_STRIPPED        ),
 159   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_EXECUTABLE_IMAGE       ),
 160   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_LINE_NUMS_STRIPPED     ),
 161   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_LOCAL_SYMS_STRIPPED    ),
 162   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_AGGRESSIVE_WS_TRIM     ),
 163   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_LARGE_ADDRESS_AWARE    ),
 164   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_BYTES_REVERSED_LO      ),
 165   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_32BIT_MACHINE          ),
 166   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_DEBUG_STRIPPED         ),
 167   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP),
 168   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_NET_RUN_FROM_SWAP      ),
 169   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_SYSTEM                 ),
 170   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_DLL                    ),
 171   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_UP_SYSTEM_ONLY         ),
 172   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_FILE_BYTES_REVERSED_HI      )
 173 };
 174
 175 static const EnumEntry<COFF::WindowsSubsystem> PEWindowsSubsystem[] = {
 176   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_UNKNOWN                ),
 177   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_NATIVE                 ),
 178   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_WINDOWS_GUI            ),
 179   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_WINDOWS_CUI            ),
 180   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_POSIX_CUI              ),
 181   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_WINDOWS_CE_GUI         ),
 182   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_EFI_APPLICATION        ),
 183   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_EFI_BOOT_SERVICE_DRIVER),
 184   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_EFI_RUNTIME_DRIVER     ),
 185   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_EFI_ROM                ),
 186   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SUBSYSTEM_XBOX                   ),
 187 };
 188
 189 static const EnumEntry<COFF::DLLCharacteristics> PEDLLCharacteristics[] = {
 190   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA      ),
 191   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE         ),
 192   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_FORCE_INTEGRITY      ),
 193   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_NX_COMPAT            ),
 194   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_NO_ISOLATION         ),
 195   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_NO_SEH               ),
 196   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_NO_BIND              ),
 197   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_APPCONTAINER         ),
 198   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_WDM_DRIVER           ),
 199   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_GUARD_CF             ),
 200   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_DLL_CHARACTERISTICS_TERMINAL_SERVER_AWARE),
 201 };
 202
 203 static const EnumEntry<COFF::SectionCharacteristics>
 204 ImageSectionCharacteristics[] = {
 205   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_TYPE_NO_PAD           ),
 206   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_CNT_CODE              ),
 207   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_CNT_INITIALIZED_DATA  ),
 208   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_CNT_UNINITIALIZED_DATA),
 209   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_LNK_OTHER             ),
 210   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_LNK_INFO              ),
 211   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_LNK_REMOVE            ),
 212   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_LNK_COMDAT            ),
 213   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_GPREL                 ),
 214   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_PURGEABLE         ),
 215   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_16BIT             ),
 216   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_LOCKED            ),
 217   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_PRELOAD           ),
 218   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_1BYTES          ),
 219   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_2BYTES          ),
 220   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_4BYTES          ),
 221   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_8BYTES          ),
 222   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_16BYTES         ),
 223   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_32BYTES         ),
 224   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_64BYTES         ),
 225   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_128BYTES        ),
 226   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_256BYTES        ),
 227   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_512BYTES        ),
 228   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_1024BYTES       ),
 229   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_2048BYTES       ),
 230   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_4096BYTES       ),
 231   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_ALIGN_8192BYTES       ),
 232   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_LNK_NRELOC_OVFL       ),
 233   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_DISCARDABLE       ),
 234   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_NOT_CACHED        ),
 235   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_NOT_PAGED         ),
 236   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_SHARED            ),
 237   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_EXECUTE           ),
 238   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_READ              ),
 239   LLVM_READOBJ_ENUM_ENT(COFF, IMAGE_SCN_MEM_WRITE             )
 240 };
 241
 242 static const EnumEntry<COFF::SymbolBaseType> ImageSymType[] = {
 243   { "Null"  , COFF::IMAGE_SYM_TYPE_NULL   },
 244   { "Void"  , COFF::IMAGE_SYM_TYPE_VOID   },
 245   { "Char"  , COFF::IMAGE_SYM_TYPE_CHAR   },
 246   { "Short" , COFF::IMAGE_SYM_TYPE_SHORT  },
 247   { "Int"   , COFF::IMAGE_SYM_TYPE_INT    },
 248   { "Long"  , COFF::IMAGE_SYM_TYPE_LONG   },
 249   { "Float" , COFF::IMAGE_SYM_TYPE_FLOAT  },
 250   { "Double", COFF::IMAGE_SYM_TYPE_DOUBLE },
 251   { "Struct", COFF::IMAGE_SYM_TYPE_STRUCT },
 252   { "Union" , COFF::IMAGE_SYM_TYPE_UNION  },
 253   { "Enum"  , COFF::IMAGE_SYM_TYPE_ENUM   },
 254   { "MOE"   , COFF::IMAGE_SYM_TYPE_MOE    },
 255   { "Byte"  , COFF::IMAGE_SYM_TYPE_BYTE   },
 256   { "Word"  , COFF::IMAGE_SYM_TYPE_WORD   },
 257   { "UInt"  , COFF::IMAGE_SYM_TYPE_UINT   },
 258   { "DWord" , COFF::IMAGE_SYM_TYPE_DWORD  }
 259 };
 260
 261 static const EnumEntry<COFF::SymbolComplexType> ImageSymDType[] = {
 262   { "Null"    , COFF::IMAGE_SYM_DTYPE_NULL     },
 263   { "Pointer" , COFF::IMAGE_SYM_DTYPE_POINTER  },
 264   { "Function", COFF::IMAGE_SYM_DTYPE_FUNCTION },
 265   { "Array"   , COFF::IMAGE_SYM_DTYPE_ARRAY    }
 266 };
 267
 268 static const EnumEntry<COFF::SymbolStorageClass> ImageSymClass[] = {
 269   { "EndOfFunction"  , COFF::IMAGE_SYM_CLASS_END_OF_FUNCTION  },
 270   { "Null"           , COFF::IMAGE_SYM_CLASS_NULL             },
 271   { "Automatic"      , COFF::IMAGE_SYM_CLASS_AUTOMATIC        },
 272   { "External"       , COFF::IMAGE_SYM_CLASS_EXTERNAL         },
 273   { "Static"         , COFF::IMAGE_SYM_CLASS_STATIC           },
 274   { "Register"       , COFF::IMAGE_SYM_CLASS_REGISTER         },
 275   { "ExternalDef"    , COFF::IMAGE_SYM_CLASS_EXTERNAL_DEF     },
 276   { "Label"          , COFF::IMAGE_SYM_CLASS_LABEL            },
 277   { "UndefinedLabel" , COFF::IMAGE_SYM_CLASS_UNDEFINED_LABEL  },
 278   { "MemberOfStruct" , COFF::IMAGE_SYM_CLASS_MEMBER_OF_STRUCT },
 279   { "Argument"       , COFF::IMAGE_SYM_CLASS_ARGUMENT         },
 280   { "StructTag"      , COFF::IMAGE_SYM_CLASS_STRUCT_TAG       },
 281   { "MemberOfUnion"  , COFF::IMAGE_SYM_CLASS_MEMBER_OF_UNION  },
 282   { "UnionTag"       , COFF::IMAGE_SYM_CLASS_UNION_TAG        },
 283   { "TypeDefinition" , COFF::IMAGE_SYM_CLASS_TYPE_DEFINITION  },
 284   { "UndefinedStatic", COFF::IMAGE_SYM_CLASS_UNDEFINED_STATIC },
 285   { "EnumTag"        , COFF::IMAGE_SYM_CLASS_ENUM_TAG         },
 286   { "MemberOfEnum"   , COFF::IMAGE_SYM_CLASS_MEMBER_OF_ENUM   },
 287   { "RegisterParam"  , COFF::IMAGE_SYM_CLASS_REGISTER_PARAM   },
 288   { "BitField"       , COFF::IMAGE_SYM_CLASS_BIT_FIELD        },
 289   { "Block"          , COFF::IMAGE_SYM_CLASS_BLOCK            },
 290   { "Function"       , COFF::IMAGE_SYM_CLASS_FUNCTION         },
 291   { "EndOfStruct"    , COFF::IMAGE_SYM_CLASS_END_OF_STRUCT    },
 292   { "File"           , COFF::IMAGE_SYM_CLASS_FILE             },
 293   { "Section"        , COFF::IMAGE_SYM_CLASS_SECTION          },
 294   { "WeakExternal"   , COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL    },
 295   { "CLRToken"       , COFF::IMAGE_SYM_CLASS_CLR_TOKEN        }
 296 };
 297
 298 static const EnumEntry<COFF::COMDATType> ImageCOMDATSelect[] = {
 299   { "NoDuplicates", COFF::IMAGE_COMDAT_SELECT_NODUPLICATES },
 300   { "Any"         , COFF::IMAGE_COMDAT_SELECT_ANY          },
 301   { "SameSize"    , COFF::IMAGE_COMDAT_SELECT_SAME_SIZE    },
 302   { "ExactMatch"  , COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH  },
 303   { "Associative" , COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE  },
 304   { "Largest"     , COFF::IMAGE_COMDAT_SELECT_LARGEST      },
 305   { "Newest"      , COFF::IMAGE_COMDAT_SELECT_NEWEST       }
 306 };
 307
 308 static const EnumEntry<COFF::WeakExternalCharacteristics>
 309 WeakExternalCharacteristics[] = {
 310   { "NoLibrary", COFF::IMAGE_WEAK_EXTERN_SEARCH_NOLIBRARY },
 311   { "Library"  , COFF::IMAGE_WEAK_EXTERN_SEARCH_LIBRARY   },
 312   { "Alias"    , COFF::IMAGE_WEAK_EXTERN_SEARCH_ALIAS     }
 313 };
 314
 315 template <typename T>
 316 static std::error_code getSymbolAuxData(const COFFObjectFile *Obj,
 317                                         COFFSymbolRef Symbol,
 318                                         uint8_t AuxSymbolIdx, const T *&Aux) {
 319   ArrayRef<uint8_t> AuxData = Obj->getSymbolAuxData(Symbol);
 320   AuxData = AuxData.slice(AuxSymbolIdx * Obj->getSymbolTableEntrySize());
 321   Aux = reinterpret_cast<const T*>(AuxData.data());
 322   return readobj_error::success;
 323 }
 324
 325 void COFFDumper::cacheRelocations() {
 326   for (const SectionRef &S : Obj->sections()) {
 327     const coff_section *Section = Obj->getCOFFSection(S);
 328
 329     for (const RelocationRef &Reloc : S.relocations())
 330       RelocMap[Section].push_back(Reloc);
 331
 332     // Sort relocations by address.
 333     std::sort(RelocMap[Section].begin(), RelocMap[Section].end(),
 334               relocAddressLess);
 335   }
 336 }
 337
 338 void COFFDumper::printDataDirectory(uint32_t Index, const std::string &FieldName) {
 339   const data_directory *Data;
 340   if (Obj->getDataDirectory(Index, Data))
 341     return;
 342   W.printHex(FieldName + "RVA", Data->RelativeVirtualAddress);
 343   W.printHex(FieldName + "Size", Data->Size);
 344 }
 345
 346 void COFFDumper::printFileHeaders() {
 347   time_t TDS = Obj->getTimeDateStamp();
 348   char FormattedTime[20] = { };
 349   strftime(FormattedTime, 20, "%Y-%m-%d %H:%M:%S", gmtime(&TDS));
 350
 351   {
 352     DictScope D(W, "ImageFileHeader");
 353     W.printEnum  ("Machine", Obj->getMachine(),
 354                     makeArrayRef(ImageFileMachineType));
 355     W.printNumber("SectionCount", Obj->getNumberOfSections());
 356     W.printHex   ("TimeDateStamp", FormattedTime, Obj->getTimeDateStamp());
 357     W.printHex   ("PointerToSymbolTable", Obj->getPointerToSymbolTable());
 358     W.printNumber("SymbolCount", Obj->getNumberOfSymbols());
 359     W.printNumber("OptionalHeaderSize", Obj->getSizeOfOptionalHeader());
 360     W.printFlags ("Characteristics", Obj->getCharacteristics(),
 361                     makeArrayRef(ImageFileCharacteristics));
 362   }
 363
 364   // Print PE header. This header does not exist if this is an object file and
 365   // not an executable.
 366   const pe32_header *PEHeader = nullptr;
 367   if (error(Obj->getPE32Header(PEHeader)))
 368     return;
 369   if (PEHeader)
 370     printPEHeader<pe32_header>(PEHeader);
 371
 372   const pe32plus_header *PEPlusHeader = nullptr;
 373   if (error(Obj->getPE32PlusHeader(PEPlusHeader)))
 374     return;
 375   if (PEPlusHeader)
 376     printPEHeader<pe32plus_header>(PEPlusHeader);
 377 }
 378
 379 template <class PEHeader>
 380 void COFFDumper::printPEHeader(const PEHeader *Hdr) {
 381   DictScope D(W, "ImageOptionalHeader");
 382   W.printNumber("MajorLinkerVersion", Hdr->MajorLinkerVersion);
 383   W.printNumber("MinorLinkerVersion", Hdr->MinorLinkerVersion);
 384   W.printNumber("SizeOfCode", Hdr->SizeOfCode);
 385   W.printNumber("SizeOfInitializedData", Hdr->SizeOfInitializedData);
 386   W.printNumber("SizeOfUninitializedData", Hdr->SizeOfUninitializedData);
 387   W.printHex   ("AddressOfEntryPoint", Hdr->AddressOfEntryPoint);
 388   W.printHex   ("BaseOfCode", Hdr->BaseOfCode);
 389   printBaseOfDataField(Hdr);
 390   W.printHex   ("ImageBase", Hdr->ImageBase);
 391   W.printNumber("SectionAlignment", Hdr->SectionAlignment);
 392   W.printNumber("FileAlignment", Hdr->FileAlignment);
 393   W.printNumber("MajorOperatingSystemVersion",
 394                 Hdr->MajorOperatingSystemVersion);
 395   W.printNumber("MinorOperatingSystemVersion",
 396                 Hdr->MinorOperatingSystemVersion);
 397   W.printNumber("MajorImageVersion", Hdr->MajorImageVersion);
 398   W.printNumber("MinorImageVersion", Hdr->MinorImageVersion);
 399   W.printNumber("MajorSubsystemVersion", Hdr->MajorSubsystemVersion);
 400   W.printNumber("MinorSubsystemVersion", Hdr->MinorSubsystemVersion);
 401   W.printNumber("SizeOfImage", Hdr->SizeOfImage);
 402   W.printNumber("SizeOfHeaders", Hdr->SizeOfHeaders);
 403   W.printEnum  ("Subsystem", Hdr->Subsystem, makeArrayRef(PEWindowsSubsystem));
 404   W.printFlags ("Subsystem", Hdr->DLLCharacteristics,
 405                 makeArrayRef(PEDLLCharacteristics));
 406   W.printNumber("SizeOfStackReserve", Hdr->SizeOfStackReserve);
 407   W.printNumber("SizeOfStackCommit", Hdr->SizeOfStackCommit);
 408   W.printNumber("SizeOfHeapReserve", Hdr->SizeOfHeapReserve);
 409   W.printNumber("SizeOfHeapCommit", Hdr->SizeOfHeapCommit);
 410   W.printNumber("NumberOfRvaAndSize", Hdr->NumberOfRvaAndSize);
 411
 412   if (Hdr->NumberOfRvaAndSize > 0) {
 413     DictScope D(W, "DataDirectory");
 414     static const char * const directory[] = {
 415       "ExportTable", "ImportTable", "ResourceTable", "ExceptionTable",
 416       "CertificateTable", "BaseRelocationTable", "Debug", "Architecture",
 417       "GlobalPtr", "TLSTable", "LoadConfigTable", "BoundImport", "IAT",
 418       "DelayImportDescriptor", "CLRRuntimeHeader", "Reserved"
 419     };
 420
 421     for (uint32_t i = 0; i < Hdr->NumberOfRvaAndSize; ++i) {
 422       printDataDirectory(i, directory[i]);
 423     }
 424   }
 425 }
 426
 427 void COFFDumper::printBaseOfDataField(const pe32_header *Hdr) {
 428   W.printHex("BaseOfData", Hdr->BaseOfData);
 429 }
 430
 431 void COFFDumper::printBaseOfDataField(const pe32plus_header *) {}
 432
 433 void COFFDumper::printCodeViewLineTables(const SectionRef &Section) {
 434   StringRef Data;
 435   if (error(Section.getContents(Data)))
 436     return;
 437
 438   SmallVector<StringRef, 10> FunctionNames;
 439   StringMap<StringRef> FunctionLineTables;
 440   StringRef FileIndexToStringOffsetTable;
 441   StringRef StringTable;
 442
 443   ListScope D(W, "CodeViewLineTables");
 444   {
 445     DataExtractor DE(Data, true, 4);
 446     uint32_t Offset = 0,
 447              Magic = DE.getU32(&Offset);
 448     W.printHex("Magic", Magic);
 449     if (Magic != COFF::DEBUG_SECTION_MAGIC) {
 450       error(object_error::parse_failed);
 451       return;
 452     }
 453
 454     bool Finished = false;
 455     while (DE.isValidOffset(Offset) && !Finished) {
 456       // The section consists of a number of subsection in the following format:
 457       // |Type|PayloadSize|Payload...|
 458       uint32_t SubSectionType = DE.getU32(&Offset),
 459                PayloadSize = DE.getU32(&Offset);
 460       ListScope S(W, "Subsection");
 461       W.printHex("Type", SubSectionType);
 462       W.printHex("PayloadSize", PayloadSize);
 463       if (PayloadSize > Data.size() - Offset) {
 464         error(object_error::parse_failed);
 465         return;
 466       }
 467
 468       // Print the raw contents to simplify debugging if anything goes wrong
 469       // afterwards.
 470       StringRef Contents = Data.substr(Offset, PayloadSize);
 471       W.printBinaryBlock("Contents", Contents);
 472
 473       switch (SubSectionType) {
 474       case COFF::DEBUG_LINE_TABLE_SUBSECTION: {
 475         // Holds a PC to file:line table.  Some data to parse this subsection is
 476         // stored in the other subsections, so just check sanity and store the
 477         // pointers for deferred processing.
 478
 479         if (PayloadSize < 12) {
 480           // There should be at least three words to store two function
 481           // relocations and size of the code.
 482           error(object_error::parse_failed);
 483           return;
 484         }
 485
 486         StringRef FunctionName;
 487         if (error(resolveSymbolName(Obj->getCOFFSection(Section), Offset,
 488                                     FunctionName)))
 489           return;
 490         W.printString("FunctionName", FunctionName);
 491         if (FunctionLineTables.count(FunctionName) != 0) {
 492           // Saw debug info for this function already?
 493           error(object_error::parse_failed);
 494           return;
 495         }
 496
 497         FunctionLineTables[FunctionName] = Contents;
 498         FunctionNames.push_back(FunctionName);
 499         break;
 500       }
 501       case COFF::DEBUG_STRING_TABLE_SUBSECTION:
 502         if (PayloadSize == 0 || StringTable.data() != nullptr ||
 503             Contents.back() != '\0') {
 504           // Empty or duplicate or non-null-terminated subsection.
 505           error(object_error::parse_failed);
 506           return;
 507         }
 508         StringTable = Contents;
 509         break;
 510       case COFF::DEBUG_INDEX_SUBSECTION:
 511         // Holds the translation table from file indices
 512         // to offsets in the string table.
 513
 514         if (PayloadSize == 0 ||
 515             FileIndexToStringOffsetTable.data() != nullptr) {
 516           // Empty or duplicate subsection.
 517           error(object_error::parse_failed);
 518           return;
 519         }
 520         FileIndexToStringOffsetTable = Contents;
 521         break;
 522       }
 523       Offset += PayloadSize;
 524
 525       // Align the reading pointer by 4.
 526       Offset += (-Offset) % 4;
 527     }
 528   }
 529
 530   // Dump the line tables now that we've read all the subsections and know all
 531   // the required information.
 532   for (unsigned I = 0, E = FunctionNames.size(); I != E; ++I) {
 533     StringRef Name = FunctionNames[I];
 534     ListScope S(W, "FunctionLineTable");
 535     W.printString("FunctionName", Name);
 536
 537     DataExtractor DE(FunctionLineTables[Name], true, 4);
 538     uint32_t Offset = 8;  // Skip relocations.
 539     uint32_t FunctionSize = DE.getU32(&Offset);
 540     W.printHex("CodeSize", FunctionSize);
 541     while (DE.isValidOffset(Offset)) {
 542       // For each range of lines with the same filename, we have a segment
 543       // in the line table.  The filename string is accessed using double
 544       // indirection to the string table subsection using the index subsection.
 545       uint32_t OffsetInIndex = DE.getU32(&Offset),
 546                SegmentLength   = DE.getU32(&Offset),
 547                FullSegmentSize = DE.getU32(&Offset);
 548       if (FullSegmentSize != 12 + 8 * SegmentLength) {
 549         error(object_error::parse_failed);
 550         return;
 551       }
 552
 553       uint32_t FilenameOffset;
 554       {
 555         DataExtractor SDE(FileIndexToStringOffsetTable, true, 4);
 556         uint32_t OffsetInSDE = OffsetInIndex;
 557         if (!SDE.isValidOffset(OffsetInSDE)) {
 558           error(object_error::parse_failed);
 559           return;
 560         }
 561         FilenameOffset = SDE.getU32(&OffsetInSDE);
 562       }
 563
 564       if (FilenameOffset == 0 || FilenameOffset + 1 >= StringTable.size() ||
 565           StringTable.data()[FilenameOffset - 1] != '\0') {
 566         // Each string in an F3 subsection should be preceded by a null
 567         // character.
 568         error(object_error::parse_failed);
 569         return;
 570       }
 571
 572       StringRef Filename(StringTable.data() + FilenameOffset);
 573       ListScope S(W, "FilenameSegment");
 574       W.printString("Filename", Filename);
 575       for (unsigned J = 0; J != SegmentLength && DE.isValidOffset(Offset);
 576            ++J) {
 577         // Then go the (PC, LineNumber) pairs.  The line number is stored in the
 578         // least significant 31 bits of the respective word in the table.
 579         uint32_t PC = DE.getU32(&Offset),
 580                  LineNumber = DE.getU32(&Offset) & 0x7fffffff;
 581         if (PC >= FunctionSize) {
 582           error(object_error::parse_failed);
 583           return;
 584         }
 585         char Buffer[32];
 586         format("+0x%X", PC).snprint(Buffer, 32);
 587         W.printNumber(Buffer, LineNumber);
 588       }
 589     }
 590   }
 591 }
 592
 593 void COFFDumper::printSections() {
 594   ListScope SectionsD(W, "Sections");
 595   int SectionNumber = 0;
 596   for (const SectionRef &Sec : Obj->sections()) {
 597     ++SectionNumber;
 598     const coff_section *Section = Obj->getCOFFSection(Sec);
 599
 600     StringRef Name;
 601     if (error(Sec.getName(Name)))
 602       Name = "";
 603
 604     DictScope D(W, "Section");
 605     W.printNumber("Number", SectionNumber);
 606     W.printBinary("Name", Name, Section->Name);
 607     W.printHex   ("VirtualSize", Section->VirtualSize);
 608     W.printHex   ("VirtualAddress", Section->VirtualAddress);
 609     W.printNumber("RawDataSize", Section->SizeOfRawData);
 610     W.printHex   ("PointerToRawData", Section->PointerToRawData);
 611     W.printHex   ("PointerToRelocations", Section->PointerToRelocations);
 612     W.printHex   ("PointerToLineNumbers", Section->PointerToLinenumbers);
 613     W.printNumber("RelocationCount", Section->NumberOfRelocations);
 614     W.printNumber("LineNumberCount", Section->NumberOfLinenumbers);
 615     W.printFlags ("Characteristics", Section->Characteristics,
 616                     makeArrayRef(ImageSectionCharacteristics),
 617                     COFF::SectionCharacteristics(0x00F00000));
 618
 619     if (opts::SectionRelocations) {
 620       ListScope D(W, "Relocations");
 621       for (const RelocationRef &Reloc : Sec.relocations())
 622         printRelocation(Sec, Reloc);
 623     }
 624
 625     if (opts::SectionSymbols) {
 626       ListScope D(W, "Symbols");
 627       for (const SymbolRef &Symbol : Obj->symbols()) {
 628         bool Contained = false;
 629         if (Sec.containsSymbol(Symbol, Contained) || !Contained)
 630           continue;
 631
 632         printSymbol(Symbol);
 633       }
 634     }
 635
 636     if (Name == ".debug$S" && opts::CodeViewLineTables)
 637       printCodeViewLineTables(Sec);
 638
 639     if (opts::SectionData &&
 640         !(Section->Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)) {
 641       StringRef Data;
 642       if (error(Sec.getContents(Data)))
 643         break;
 644
 645       W.printBinaryBlock("SectionData", Data);
 646     }
 647   }
 648 }
 649
 650 void COFFDumper::printRelocations() {
 651   ListScope D(W, "Relocations");
 652
 653   int SectionNumber = 0;
 654   for (const SectionRef &Section : Obj->sections()) {
 655     ++SectionNumber;
 656     StringRef Name;
 657     if (error(Section.getName(Name)))
 658       continue;
 659
 660     bool PrintedGroup = false;
 661     for (const RelocationRef &Reloc : Section.relocations()) {
 662       if (!PrintedGroup) {
 663         W.startLine() << "Section (" << SectionNumber << ") " << Name << " {\n";
 664         W.indent();
 665         PrintedGroup = true;
 666       }
 667
 668       printRelocation(Section, Reloc);
 669     }
 670
 671     if (PrintedGroup) {
 672       W.unindent();
 673       W.startLine() << "}\n";
 674     }
 675   }
 676 }
 677
 678 void COFFDumper::printRelocation(const SectionRef &Section,
 679                                  const RelocationRef &Reloc) {
 680   uint64_t Offset;
 681   uint64_t RelocType;
 682   SmallString<32> RelocName;
 683   StringRef SymbolName;
 684   StringRef Contents;
 685   if (error(Reloc.getOffset(Offset)))
 686     return;
 687   if (error(Reloc.getType(RelocType)))
 688     return;
 689   if (error(Reloc.getTypeName(RelocName)))
 690     return;
 691   symbol_iterator Symbol = Reloc.getSymbol();
 692   if (error(Symbol->getName(SymbolName)))
 693     return;
 694   if (error(Section.getContents(Contents)))
 695     return;
 696
 697   if (opts::ExpandRelocs) {
 698     DictScope Group(W, "Relocation");
 699     W.printHex("Offset", Offset);
 700     W.printNumber("Type", RelocName, RelocType);
 701     W.printString("Symbol", SymbolName.size() > 0 ? SymbolName : "-");
 702   } else {
 703     raw_ostream& OS = W.startLine();
 704     OS << W.hex(Offset)
 705        << " " << RelocName
 706        << " " << (SymbolName.size() > 0 ? SymbolName : "-")
 707        << "\n";
 708   }
 709 }
 710
 711 void COFFDumper::printSymbols() {
 712   ListScope Group(W, "Symbols");
 713
 714   for (const SymbolRef &Symbol : Obj->symbols())
 715     printSymbol(Symbol);
 716 }
 717
 718 void COFFDumper::printDynamicSymbols() { ListScope Group(W, "DynamicSymbols"); }
 719
 720 static StringRef getSectionName(const llvm::object::COFFObjectFile *Obj,
 721                                 COFFSymbolRef Symbol,
 722                                 const coff_section *Section) {
 723   if (Section) {
 724     StringRef SectionName;
 725     Obj->getSectionName(Section, SectionName);
 726     return SectionName;
 727   }
 728   int32_t SectionNumber = Symbol.getSectionNumber();
 729   if (SectionNumber == llvm::COFF::IMAGE_SYM_DEBUG)
 730     return "IMAGE_SYM_DEBUG";
 731   if (SectionNumber == llvm::COFF::IMAGE_SYM_ABSOLUTE)
 732     return "IMAGE_SYM_ABSOLUTE";
 733   if (SectionNumber == llvm::COFF::IMAGE_SYM_UNDEFINED)
 734     return "IMAGE_SYM_UNDEFINED";
 735   return "";
 736 }
 737
 738 void COFFDumper::printSymbol(const SymbolRef &Sym) {
 739   DictScope D(W, "Symbol");
 740
 741   COFFSymbolRef Symbol = Obj->getCOFFSymbol(Sym);
 742   const coff_section *Section;
 743   if (std::error_code EC = Obj->getSection(Symbol.getSectionNumber(), Section)) {
 744     W.startLine() << "Invalid section number: " << EC.message() << "\n";
 745     W.flush();
 746     return;
 747   }
 748
 749   StringRef SymbolName;
 750   if (Obj->getSymbolName(Symbol, SymbolName))
 751     SymbolName = "";
 752
 753   StringRef SectionName = getSectionName(Obj, Symbol, Section);
 754
 755   W.printString("Name", SymbolName);
 756   W.printNumber("Value", Symbol.getValue());
 757   W.printNumber("Section", SectionName, Symbol.getSectionNumber());
 758   W.printEnum  ("BaseType", Symbol.getBaseType(), makeArrayRef(ImageSymType));
 759   W.printEnum  ("ComplexType", Symbol.getComplexType(),
 760                                                    makeArrayRef(ImageSymDType));
 761   W.printEnum  ("StorageClass", Symbol.getStorageClass(),
 762                                                    makeArrayRef(ImageSymClass));
 763   W.printNumber("AuxSymbolCount", Symbol.getNumberOfAuxSymbols());
 764
 765   for (uint8_t I = 0; I < Symbol.getNumberOfAuxSymbols(); ++I) {
 766     if (Symbol.isFunctionDefinition()) {
 767       const coff_aux_function_definition *Aux;
 768       if (error(getSymbolAuxData(Obj, Symbol, I, Aux)))
 769         break;
 770
 771       DictScope AS(W, "AuxFunctionDef");
 772       W.printNumber("TagIndex", Aux->TagIndex);
 773       W.printNumber("TotalSize", Aux->TotalSize);
 774       W.printHex("PointerToLineNumber", Aux->PointerToLinenumber);
 775       W.printHex("PointerToNextFunction", Aux->PointerToNextFunction);
 776
 777     } else if (Symbol.isWeakExternal()) {
 778       const coff_aux_weak_external *Aux;
 779       if (error(getSymbolAuxData(Obj, Symbol, I, Aux)))
 780         break;
 781
 782       ErrorOr<COFFSymbolRef> Linked = Obj->getSymbol(Aux->TagIndex);
 783       StringRef LinkedName;
 784       std::error_code EC = Linked.getError();
 785       if (EC || (EC = Obj->getSymbolName(*Linked, LinkedName))) {
 786         LinkedName = "";
 787         error(EC);
 788       }
 789
 790       DictScope AS(W, "AuxWeakExternal");
 791       W.printNumber("Linked", LinkedName, Aux->TagIndex);
 792       W.printEnum  ("Search", Aux->Characteristics,
 793                     makeArrayRef(WeakExternalCharacteristics));
 794
 795     } else if (Symbol.isFileRecord()) {
 796       const char *FileName;
 797       if (error(getSymbolAuxData(Obj, Symbol, I, FileName)))
 798         break;
 799
 800       DictScope AS(W, "AuxFileRecord");
 801
 802       StringRef Name(FileName, Symbol.getNumberOfAuxSymbols() *
 803                                    Obj->getSymbolTableEntrySize());
 804       W.printString("FileName", Name.rtrim(StringRef("\0", 1)));
 805       break;
 806     } else if (Symbol.isSectionDefinition()) {
 807       const coff_aux_section_definition *Aux;
 808       if (error(getSymbolAuxData(Obj, Symbol, I, Aux)))
 809         break;
 810
 811       int32_t AuxNumber = Aux->getNumber(Symbol.isBigObj());
 812
 813       DictScope AS(W, "AuxSectionDef");
 814       W.printNumber("Length", Aux->Length);
 815       W.printNumber("RelocationCount", Aux->NumberOfRelocations);
 816       W.printNumber("LineNumberCount", Aux->NumberOfLinenumbers);
 817       W.printHex("Checksum", Aux->CheckSum);
 818       W.printNumber("Number", AuxNumber);
 819       W.printEnum("Selection", Aux->Selection, makeArrayRef(ImageCOMDATSelect));
 820
 821       if (Section && Section->Characteristics & COFF::IMAGE_SCN_LNK_COMDAT
 822           && Aux->Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) {
 823         const coff_section *Assoc;
 824         StringRef AssocName;
 825         std::error_code EC;
 826         if ((EC = Obj->getSection(AuxNumber, Assoc)) ||
 827             (EC = Obj->getSectionName(Assoc, AssocName))) {
 828           AssocName = "";
 829           error(EC);
 830         }
 831
 832         W.printNumber("AssocSection", AssocName, AuxNumber);
 833       }
 834     } else if (Symbol.isCLRToken()) {
 835       const coff_aux_clr_token *Aux;
 836       if (error(getSymbolAuxData(Obj, Symbol, I, Aux)))
 837         break;
 838
 839       ErrorOr<COFFSymbolRef> ReferredSym =
 840           Obj->getSymbol(Aux->SymbolTableIndex);
 841       StringRef ReferredName;
 842       std::error_code EC = ReferredSym.getError();
 843       if (EC || (EC = Obj->getSymbolName(*ReferredSym, ReferredName))) {
 844         ReferredName = "";
 845         error(EC);
 846       }
 847
 848       DictScope AS(W, "AuxCLRToken");
 849       W.printNumber("AuxType", Aux->AuxType);
 850       W.printNumber("Reserved", Aux->Reserved);
 851       W.printNumber("SymbolTableIndex", ReferredName, Aux->SymbolTableIndex);
 852
 853     } else {
 854       W.startLine() << "<unhandled auxiliary record>\n";
 855     }
 856   }
 857 }
 858
 859 void COFFDumper::printUnwindInfo() {
 860   ListScope D(W, "UnwindInformation");
 861   switch (Obj->getMachine()) {
 862   case COFF::IMAGE_FILE_MACHINE_AMD64: {
 863     Win64EH::Dumper Dumper(W);
 864     Win64EH::Dumper::SymbolResolver
 865     Resolver = [](const object::coff_section *Section, uint64_t Offset,
 866                   SymbolRef &Symbol, void *user_data) -> std::error_code {
 867       COFFDumper *Dumper = reinterpret_cast<COFFDumper *>(user_data);
 868       return Dumper->resolveSymbol(Section, Offset, Symbol);
 869     };
 870     Win64EH::Dumper::Context Ctx(*Obj, Resolver, this);
 871     Dumper.printData(Ctx);
 872     break;
 873   }
 874   case COFF::IMAGE_FILE_MACHINE_ARMNT: {
 875     ARM::WinEH::Decoder Decoder(W);
 876     Decoder.dumpProcedureData(*Obj);
 877     break;
 878   }
 879   default:
 880     W.printEnum("unsupported Image Machine", Obj->getMachine(),
 881                 makeArrayRef(ImageFileMachineType));
 882     break;
 883   }
 884 }
 885
 886 void COFFDumper::printCOFFImports() {
 887   for (auto I = Obj->import_directory_begin(), E = Obj->import_directory_end();
 888        I != E; ++I) {
 889     DictScope Import(W, "Import");
 890     StringRef Name;
 891     if (error(I->getName(Name))) return;
 892     W.printString("Name", Name);
 893     uint32_t Addr;
 894     if (error(I->getImportLookupTableRVA(Addr))) return;
 895     W.printHex("ImportLookupTableRVA", Addr);
 896     if (error(I->getImportAddressTableRVA(Addr))) return;
 897     W.printHex("ImportAddressTableRVA", Addr);
 898     for (auto J = I->imported_symbol_begin(), F = I->imported_symbol_end();
 899          J != F; ++J) {
 900       StringRef Sym;
 901       if (error(J->getSymbolName(Sym))) return;
 902       uint16_t Ordinal;
 903       if (error(J->getOrdinal(Ordinal))) return;
 904       W.printNumber("Symbol", Sym, Ordinal);
 905     }
 906   }
 907 }