tools/llvm-objdump/COFFDump.cpp

   1 //===-- COFFDump.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-objdump.
  12 /// It outputs the Win64 EH data structures as plain text.
  13 /// The encoding of the unwind codes is described in MSDN:
  14 /// http://msdn.microsoft.com/en-us/library/ck9asaa9.aspx
  15 ///
  16 //===----------------------------------------------------------------------===//
  17
  18 #include "llvm-objdump.h"
  19 #include "llvm/Object/COFF.h"
  20 #include "llvm/Object/COFFImportFile.h"
  21 #include "llvm/Object/ObjectFile.h"
  22 #include "llvm/Support/Format.h"
  23 #include "llvm/Support/SourceMgr.h"
  24 #include "llvm/Support/Win64EH.h"
  25 #include "llvm/Support/raw_ostream.h"
  26 #include <algorithm>
  27 #include <cstring>
  28 #include <system_error>
  29
  30 using namespace llvm;
  31 using namespace object;
  32 using namespace llvm::Win64EH;
  33
  34 // Returns the name of the unwind code.
  35 static StringRef getUnwindCodeTypeName(uint8_t Code) {
  36   switch(Code) {
  37   default: llvm_unreachable("Invalid unwind code");
  38   case UOP_PushNonVol: return "UOP_PushNonVol";
  39   case UOP_AllocLarge: return "UOP_AllocLarge";
  40   case UOP_AllocSmall: return "UOP_AllocSmall";
  41   case UOP_SetFPReg: return "UOP_SetFPReg";
  42   case UOP_SaveNonVol: return "UOP_SaveNonVol";
  43   case UOP_SaveNonVolBig: return "UOP_SaveNonVolBig";
  44   case UOP_SaveXMM128: return "UOP_SaveXMM128";
  45   case UOP_SaveXMM128Big: return "UOP_SaveXMM128Big";
  46   case UOP_PushMachFrame: return "UOP_PushMachFrame";
  47   }
  48 }
  49
  50 // Returns the name of a referenced register.
  51 static StringRef getUnwindRegisterName(uint8_t Reg) {
  52   switch(Reg) {
  53   default: llvm_unreachable("Invalid register");
  54   case 0: return "RAX";
  55   case 1: return "RCX";
  56   case 2: return "RDX";
  57   case 3: return "RBX";
  58   case 4: return "RSP";
  59   case 5: return "RBP";
  60   case 6: return "RSI";
  61   case 7: return "RDI";
  62   case 8: return "R8";
  63   case 9: return "R9";
  64   case 10: return "R10";
  65   case 11: return "R11";
  66   case 12: return "R12";
  67   case 13: return "R13";
  68   case 14: return "R14";
  69   case 15: return "R15";
  70   }
  71 }
  72
  73 // Calculates the number of array slots required for the unwind code.
  74 static unsigned getNumUsedSlots(const UnwindCode &UnwindCode) {
  75   switch (UnwindCode.getUnwindOp()) {
  76   default: llvm_unreachable("Invalid unwind code");
  77   case UOP_PushNonVol:
  78   case UOP_AllocSmall:
  79   case UOP_SetFPReg:
  80   case UOP_PushMachFrame:
  81     return 1;
  82   case UOP_SaveNonVol:
  83   case UOP_SaveXMM128:
  84     return 2;
  85   case UOP_SaveNonVolBig:
  86   case UOP_SaveXMM128Big:
  87     return 3;
  88   case UOP_AllocLarge:
  89     return (UnwindCode.getOpInfo() == 0) ? 2 : 3;
  90   }
  91 }
  92
  93 // Prints one unwind code. Because an unwind code can occupy up to 3 slots in
  94 // the unwind codes array, this function requires that the correct number of
  95 // slots is provided.
  96 static void printUnwindCode(ArrayRef<UnwindCode> UCs) {
  97   assert(UCs.size() >= getNumUsedSlots(UCs[0]));
  98   outs() <<  format("      0x%02x: ", unsigned(UCs[0].u.CodeOffset))
  99          << getUnwindCodeTypeName(UCs[0].getUnwindOp());
 100   switch (UCs[0].getUnwindOp()) {
 101   case UOP_PushNonVol:
 102     outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo());
 103     break;
 104   case UOP_AllocLarge:
 105     if (UCs[0].getOpInfo() == 0) {
 106       outs() << " " << UCs[1].FrameOffset;
 107     } else {
 108       outs() << " " << UCs[1].FrameOffset
 109                        + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16);
 110     }
 111     break;
 112   case UOP_AllocSmall:
 113     outs() << " " << ((UCs[0].getOpInfo() + 1) * 8);
 114     break;
 115   case UOP_SetFPReg:
 116     outs() << " ";
 117     break;
 118   case UOP_SaveNonVol:
 119     outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo())
 120            << format(" [0x%04x]", 8 * UCs[1].FrameOffset);
 121     break;
 122   case UOP_SaveNonVolBig:
 123     outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo())
 124            << format(" [0x%08x]", UCs[1].FrameOffset
 125                     + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16));
 126     break;
 127   case UOP_SaveXMM128:
 128     outs() << " XMM" << static_cast<uint32_t>(UCs[0].getOpInfo())
 129            << format(" [0x%04x]", 16 * UCs[1].FrameOffset);
 130     break;
 131   case UOP_SaveXMM128Big:
 132     outs() << " XMM" << UCs[0].getOpInfo()
 133            << format(" [0x%08x]", UCs[1].FrameOffset
 134                            + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16));
 135     break;
 136   case UOP_PushMachFrame:
 137     outs() << " " << (UCs[0].getOpInfo() ? "w/o" : "w")
 138            << " error code";
 139     break;
 140   }
 141   outs() << "\n";
 142 }
 143
 144 static void printAllUnwindCodes(ArrayRef<UnwindCode> UCs) {
 145   for (const UnwindCode *I = UCs.begin(), *E = UCs.end(); I < E; ) {
 146     unsigned UsedSlots = getNumUsedSlots(*I);
 147     if (UsedSlots > UCs.size()) {
 148       outs() << "Unwind data corrupted: Encountered unwind op "
 149              << getUnwindCodeTypeName((*I).getUnwindOp())
 150              << " which requires " << UsedSlots
 151              << " slots, but only " << UCs.size()
 152              << " remaining in buffer";
 153       return ;
 154     }
 155     printUnwindCode(makeArrayRef(I, E));
 156     I += UsedSlots;
 157   }
 158 }
 159
 160 // Given a symbol sym this functions returns the address and section of it.
 161 static std::error_code
 162 resolveSectionAndAddress(const COFFObjectFile *Obj, const SymbolRef &Sym,
 163                          const coff_section *&ResolvedSection,
 164                          uint64_t &ResolvedAddr) {
 165   Expected<uint64_t> ResolvedAddrOrErr = Sym.getAddress();
 166   if (!ResolvedAddrOrErr)
 167     return errorToErrorCode(ResolvedAddrOrErr.takeError());
 168   ResolvedAddr = *ResolvedAddrOrErr;
 169   Expected<section_iterator> Iter = Sym.getSection();
 170   if (!Iter)
 171     return errorToErrorCode(Iter.takeError());
 172   ResolvedSection = Obj->getCOFFSection(**Iter);
 173   return std::error_code();
 174 }
 175
 176 // Given a vector of relocations for a section and an offset into this section
 177 // the function returns the symbol used for the relocation at the offset.
 178 static std::error_code resolveSymbol(const std::vector<RelocationRef> &Rels,
 179                                      uint64_t Offset, SymbolRef &Sym) {
 180   for (auto &R : Rels) {
 181     uint64_t Ofs = R.getOffset();
 182     if (Ofs == Offset) {
 183       Sym = *R.getSymbol();
 184       return std::error_code();
 185     }
 186   }
 187   return object_error::parse_failed;
 188 }
 189
 190 // Given a vector of relocations for a section and an offset into this section
 191 // the function resolves the symbol used for the relocation at the offset and
 192 // returns the section content and the address inside the content pointed to
 193 // by the symbol.
 194 static std::error_code
 195 getSectionContents(const COFFObjectFile *Obj,
 196                    const std::vector<RelocationRef> &Rels, uint64_t Offset,
 197                    ArrayRef<uint8_t> &Contents, uint64_t &Addr) {
 198   SymbolRef Sym;
 199   if (std::error_code EC = resolveSymbol(Rels, Offset, Sym))
 200     return EC;
 201   const coff_section *Section;
 202   if (std::error_code EC = resolveSectionAndAddress(Obj, Sym, Section, Addr))
 203     return EC;
 204   if (std::error_code EC = Obj->getSectionContents(Section, Contents))
 205     return EC;
 206   return std::error_code();
 207 }
 208
 209 // Given a vector of relocations for a section and an offset into this section
 210 // the function returns the name of the symbol used for the relocation at the
 211 // offset.
 212 static std::error_code resolveSymbolName(const std::vector<RelocationRef> &Rels,
 213                                          uint64_t Offset, StringRef &Name) {
 214   SymbolRef Sym;
 215   if (std::error_code EC = resolveSymbol(Rels, Offset, Sym))
 216     return EC;
 217   Expected<StringRef> NameOrErr = Sym.getName();
 218   if (!NameOrErr)
 219     return errorToErrorCode(NameOrErr.takeError());
 220   Name = *NameOrErr;
 221   return std::error_code();
 222 }
 223
 224 static void printCOFFSymbolAddress(llvm::raw_ostream &Out,
 225                                    const std::vector<RelocationRef> &Rels,
 226                                    uint64_t Offset, uint32_t Disp) {
 227   StringRef Sym;
 228   if (!resolveSymbolName(Rels, Offset, Sym)) {
 229     Out << Sym;
 230     if (Disp > 0)
 231       Out << format(" + 0x%04x", Disp);
 232   } else {
 233     Out << format("0x%04x", Disp);
 234   }
 235 }
 236
 237 static void
 238 printSEHTable(const COFFObjectFile *Obj, uint32_t TableVA, int Count) {
 239   if (Count == 0)
 240     return;
 241
 242   const pe32_header *PE32Header;
 243   error(Obj->getPE32Header(PE32Header));
 244   uint32_t ImageBase = PE32Header->ImageBase;
 245   uintptr_t IntPtr = 0;
 246   error(Obj->getVaPtr(TableVA, IntPtr));
 247   const support::ulittle32_t *P = (const support::ulittle32_t *)IntPtr;
 248   outs() << "SEH Table:";
 249   for (int I = 0; I < Count; ++I)
 250     outs() << format(" 0x%x", P[I] + ImageBase);
 251   outs() << "\n\n";
 252 }
 253
 254 template <typename T>
 255 static void printTLSDirectoryT(const coff_tls_directory<T> *TLSDir) {
 256   size_t FormatWidth = sizeof(T) * 2;
 257   outs() << "TLS directory:"
 258          << "\n  StartAddressOfRawData: "
 259          << format_hex(TLSDir->StartAddressOfRawData, FormatWidth)
 260          << "\n  EndAddressOfRawData: "
 261          << format_hex(TLSDir->EndAddressOfRawData, FormatWidth)
 262          << "\n  AddressOfIndex: "
 263          << format_hex(TLSDir->AddressOfIndex, FormatWidth)
 264          << "\n  AddressOfCallBacks: "
 265          << format_hex(TLSDir->AddressOfCallBacks, FormatWidth)
 266          << "\n  SizeOfZeroFill: "
 267          << TLSDir->SizeOfZeroFill
 268          << "\n  Characteristics: "
 269          << TLSDir->Characteristics
 270          << "\n  Alignment: "
 271          << TLSDir->getAlignment()
 272          << "\n\n";
 273 }
 274
 275 static void printTLSDirectory(const COFFObjectFile *Obj) {
 276   const pe32_header *PE32Header;
 277   error(Obj->getPE32Header(PE32Header));
 278
 279   const pe32plus_header *PE32PlusHeader;
 280   error(Obj->getPE32PlusHeader(PE32PlusHeader));
 281
 282   // Skip if it's not executable.
 283   if (!PE32Header && !PE32PlusHeader)
 284     return;
 285
 286   const data_directory *DataDir;
 287   error(Obj->getDataDirectory(COFF::TLS_TABLE, DataDir));
 288   uintptr_t IntPtr = 0;
 289   if (DataDir->RelativeVirtualAddress == 0)
 290     return;
 291   error(Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr));
 292
 293   if (PE32Header) {
 294     auto *TLSDir = reinterpret_cast<const coff_tls_directory32 *>(IntPtr);
 295     printTLSDirectoryT(TLSDir);
 296   } else {
 297     auto *TLSDir = reinterpret_cast<const coff_tls_directory64 *>(IntPtr);
 298     printTLSDirectoryT(TLSDir);
 299   }
 300
 301   outs() << "\n";
 302 }
 303
 304 static void printLoadConfiguration(const COFFObjectFile *Obj) {
 305   // Skip if it's not executable.
 306   const pe32_header *PE32Header;
 307   error(Obj->getPE32Header(PE32Header));
 308   if (!PE32Header)
 309     return;
 310
 311   // Currently only x86 is supported
 312   if (Obj->getMachine() != COFF::IMAGE_FILE_MACHINE_I386)
 313     return;
 314
 315   const data_directory *DataDir;
 316   error(Obj->getDataDirectory(COFF::LOAD_CONFIG_TABLE, DataDir));
 317   uintptr_t IntPtr = 0;
 318   if (DataDir->RelativeVirtualAddress == 0)
 319     return;
 320   error(Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr));
 321
 322   auto *LoadConf = reinterpret_cast<const coff_load_configuration32 *>(IntPtr);
 323   outs() << "Load configuration:"
 324          << "\n  Timestamp: " << LoadConf->TimeDateStamp
 325          << "\n  Major Version: " << LoadConf->MajorVersion
 326          << "\n  Minor Version: " << LoadConf->MinorVersion
 327          << "\n  GlobalFlags Clear: " << LoadConf->GlobalFlagsClear
 328          << "\n  GlobalFlags Set: " << LoadConf->GlobalFlagsSet
 329          << "\n  Critical Section Default Timeout: " << LoadConf->CriticalSectionDefaultTimeout
 330          << "\n  Decommit Free Block Threshold: " << LoadConf->DeCommitFreeBlockThreshold
 331          << "\n  Decommit Total Free Threshold: " << LoadConf->DeCommitTotalFreeThreshold
 332          << "\n  Lock Prefix Table: " << LoadConf->LockPrefixTable
 333          << "\n  Maximum Allocation Size: " << LoadConf->MaximumAllocationSize
 334          << "\n  Virtual Memory Threshold: " << LoadConf->VirtualMemoryThreshold
 335          << "\n  Process Affinity Mask: " << LoadConf->ProcessAffinityMask
 336          << "\n  Process Heap Flags: " << LoadConf->ProcessHeapFlags
 337          << "\n  CSD Version: " << LoadConf->CSDVersion
 338          << "\n  Security Cookie: " << LoadConf->SecurityCookie
 339          << "\n  SEH Table: " << LoadConf->SEHandlerTable
 340          << "\n  SEH Count: " << LoadConf->SEHandlerCount
 341          << "\n\n";
 342   printSEHTable(Obj, LoadConf->SEHandlerTable, LoadConf->SEHandlerCount);
 343   outs() << "\n";
 344 }
 345
 346 // Prints import tables. The import table is a table containing the list of
 347 // DLL name and symbol names which will be linked by the loader.
 348 static void printImportTables(const COFFObjectFile *Obj) {
 349   import_directory_iterator I = Obj->import_directory_begin();
 350   import_directory_iterator E = Obj->import_directory_end();
 351   if (I == E)
 352     return;
 353   outs() << "The Import Tables:\n";
 354   for (const ImportDirectoryEntryRef &DirRef : Obj->import_directories()) {
 355     const coff_import_directory_table_entry *Dir;
 356     StringRef Name;
 357     if (DirRef.getImportTableEntry(Dir)) return;
 358     if (DirRef.getName(Name)) return;
 359
 360     outs() << format("  lookup %08x time %08x fwd %08x name %08x addr %08x\n\n",
 361                      static_cast<uint32_t>(Dir->ImportLookupTableRVA),
 362                      static_cast<uint32_t>(Dir->TimeDateStamp),
 363                      static_cast<uint32_t>(Dir->ForwarderChain),
 364                      static_cast<uint32_t>(Dir->NameRVA),
 365                      static_cast<uint32_t>(Dir->ImportAddressTableRVA));
 366     outs() << "    DLL Name: " << Name << "\n";
 367     outs() << "    Hint/Ord  Name\n";
 368     for (const ImportedSymbolRef &Entry : DirRef.imported_symbols()) {
 369       bool IsOrdinal;
 370       if (Entry.isOrdinal(IsOrdinal))
 371         return;
 372       if (IsOrdinal) {
 373         uint16_t Ordinal;
 374         if (Entry.getOrdinal(Ordinal))
 375           return;
 376         outs() << format("      % 6d\n", Ordinal);
 377         continue;
 378       }
 379       uint32_t HintNameRVA;
 380       if (Entry.getHintNameRVA(HintNameRVA))
 381         return;
 382       uint16_t Hint;
 383       StringRef Name;
 384       if (Obj->getHintName(HintNameRVA, Hint, Name))
 385         return;
 386       outs() << format("      % 6d  ", Hint) << Name << "\n";
 387     }
 388     outs() << "\n";
 389   }
 390 }
 391
 392 // Prints export tables. The export table is a table containing the list of
 393 // exported symbol from the DLL.
 394 static void printExportTable(const COFFObjectFile *Obj) {
 395   outs() << "Export Table:\n";
 396   export_directory_iterator I = Obj->export_directory_begin();
 397   export_directory_iterator E = Obj->export_directory_end();
 398   if (I == E)
 399     return;
 400   StringRef DllName;
 401   uint32_t OrdinalBase;
 402   if (I->getDllName(DllName))
 403     return;
 404   if (I->getOrdinalBase(OrdinalBase))
 405     return;
 406   outs() << " DLL name: " << DllName << "\n";
 407   outs() << " Ordinal base: " << OrdinalBase << "\n";
 408   outs() << " Ordinal      RVA  Name\n";
 409   for (; I != E; I = ++I) {
 410     uint32_t Ordinal;
 411     if (I->getOrdinal(Ordinal))
 412       return;
 413     uint32_t RVA;
 414     if (I->getExportRVA(RVA))
 415       return;
 416     bool IsForwarder;
 417     if (I->isForwarder(IsForwarder))
 418       return;
 419
 420     if (IsForwarder) {
 421       // Export table entries can be used to re-export symbols that
 422       // this COFF file is imported from some DLLs. This is rare.
 423       // In most cases IsForwarder is false.
 424       outs() << format("    % 4d         ", Ordinal);
 425     } else {
 426       outs() << format("    % 4d %# 8x", Ordinal, RVA);
 427     }
 428
 429     StringRef Name;
 430     if (I->getSymbolName(Name))
 431       continue;
 432     if (!Name.empty())
 433       outs() << "  " << Name;
 434     if (IsForwarder) {
 435       StringRef S;
 436       if (I->getForwardTo(S))
 437         return;
 438       outs() << " (forwarded to " << S << ")";
 439     }
 440     outs() << "\n";
 441   }
 442 }
 443
 444 // Given the COFF object file, this function returns the relocations for .pdata
 445 // and the pointer to "runtime function" structs.
 446 static bool getPDataSection(const COFFObjectFile *Obj,
 447                             std::vector<RelocationRef> &Rels,
 448                             const RuntimeFunction *&RFStart, int &NumRFs) {
 449   for (const SectionRef &Section : Obj->sections()) {
 450     StringRef Name;
 451     error(Section.getName(Name));
 452     if (Name != ".pdata")
 453       continue;
 454
 455     const coff_section *Pdata = Obj->getCOFFSection(Section);
 456     for (const RelocationRef &Reloc : Section.relocations())
 457       Rels.push_back(Reloc);
 458
 459     // Sort relocations by address.
 460     std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
 461
 462     ArrayRef<uint8_t> Contents;
 463     error(Obj->getSectionContents(Pdata, Contents));
 464     if (Contents.empty())
 465       continue;
 466
 467     RFStart = reinterpret_cast<const RuntimeFunction *>(Contents.data());
 468     NumRFs = Contents.size() / sizeof(RuntimeFunction);
 469     return true;
 470   }
 471   return false;
 472 }
 473
 474 static void printWin64EHUnwindInfo(const Win64EH::UnwindInfo *UI) {
 475   // The casts to int are required in order to output the value as number.
 476   // Without the casts the value would be interpreted as char data (which
 477   // results in garbage output).
 478   outs() << "    Version: " << static_cast<int>(UI->getVersion()) << "\n";
 479   outs() << "    Flags: " << static_cast<int>(UI->getFlags());
 480   if (UI->getFlags()) {
 481     if (UI->getFlags() & UNW_ExceptionHandler)
 482       outs() << " UNW_ExceptionHandler";
 483     if (UI->getFlags() & UNW_TerminateHandler)
 484       outs() << " UNW_TerminateHandler";
 485     if (UI->getFlags() & UNW_ChainInfo)
 486       outs() << " UNW_ChainInfo";
 487   }
 488   outs() << "\n";
 489   outs() << "    Size of prolog: " << static_cast<int>(UI->PrologSize) << "\n";
 490   outs() << "    Number of Codes: " << static_cast<int>(UI->NumCodes) << "\n";
 491   // Maybe this should move to output of UOP_SetFPReg?
 492   if (UI->getFrameRegister()) {
 493     outs() << "    Frame register: "
 494            << getUnwindRegisterName(UI->getFrameRegister()) << "\n";
 495     outs() << "    Frame offset: " << 16 * UI->getFrameOffset() << "\n";
 496   } else {
 497     outs() << "    No frame pointer used\n";
 498   }
 499   if (UI->getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) {
 500     // FIXME: Output exception handler data
 501   } else if (UI->getFlags() & UNW_ChainInfo) {
 502     // FIXME: Output chained unwind info
 503   }
 504
 505   if (UI->NumCodes)
 506     outs() << "    Unwind Codes:\n";
 507
 508   printAllUnwindCodes(makeArrayRef(&UI->UnwindCodes[0], UI->NumCodes));
 509
 510   outs() << "\n";
 511   outs().flush();
 512 }
 513
 514 /// Prints out the given RuntimeFunction struct for x64, assuming that Obj is
 515 /// pointing to an executable file.
 516 static void printRuntimeFunction(const COFFObjectFile *Obj,
 517                                  const RuntimeFunction &RF) {
 518   if (!RF.StartAddress)
 519     return;
 520   outs() << "Function Table:\n"
 521          << format("  Start Address: 0x%04x\n",
 522                    static_cast<uint32_t>(RF.StartAddress))
 523          << format("  End Address: 0x%04x\n",
 524                    static_cast<uint32_t>(RF.EndAddress))
 525          << format("  Unwind Info Address: 0x%04x\n",
 526                    static_cast<uint32_t>(RF.UnwindInfoOffset));
 527   uintptr_t addr;
 528   if (Obj->getRvaPtr(RF.UnwindInfoOffset, addr))
 529     return;
 530   printWin64EHUnwindInfo(reinterpret_cast<const Win64EH::UnwindInfo *>(addr));
 531 }
 532
 533 /// Prints out the given RuntimeFunction struct for x64, assuming that Obj is
 534 /// pointing to an object file. Unlike executable, fields in RuntimeFunction
 535 /// struct are filled with zeros, but instead there are relocations pointing to
 536 /// them so that the linker will fill targets' RVAs to the fields at link
 537 /// time. This function interprets the relocations to find the data to be used
 538 /// in the resulting executable.
 539 static void printRuntimeFunctionRels(const COFFObjectFile *Obj,
 540                                      const RuntimeFunction &RF,
 541                                      uint64_t SectionOffset,
 542                                      const std::vector<RelocationRef> &Rels) {
 543   outs() << "Function Table:\n";
 544   outs() << "  Start Address: ";
 545   printCOFFSymbolAddress(outs(), Rels,
 546                          SectionOffset +
 547                              /*offsetof(RuntimeFunction, StartAddress)*/ 0,
 548                          RF.StartAddress);
 549   outs() << "\n";
 550
 551   outs() << "  End Address: ";
 552   printCOFFSymbolAddress(outs(), Rels,
 553                          SectionOffset +
 554                              /*offsetof(RuntimeFunction, EndAddress)*/ 4,
 555                          RF.EndAddress);
 556   outs() << "\n";
 557
 558   outs() << "  Unwind Info Address: ";
 559   printCOFFSymbolAddress(outs(), Rels,
 560                          SectionOffset +
 561                              /*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8,
 562                          RF.UnwindInfoOffset);
 563   outs() << "\n";
 564
 565   ArrayRef<uint8_t> XContents;
 566   uint64_t UnwindInfoOffset = 0;
 567   error(getSectionContents(
 568           Obj, Rels, SectionOffset +
 569                          /*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8,
 570           XContents, UnwindInfoOffset));
 571   if (XContents.empty())
 572     return;
 573
 574   UnwindInfoOffset += RF.UnwindInfoOffset;
 575   if (UnwindInfoOffset > XContents.size())
 576     return;
 577
 578   auto *UI = reinterpret_cast<const Win64EH::UnwindInfo *>(XContents.data() +
 579                                                            UnwindInfoOffset);
 580   printWin64EHUnwindInfo(UI);
 581 }
 582
 583 void llvm::printCOFFUnwindInfo(const COFFObjectFile *Obj) {
 584   if (Obj->getMachine() != COFF::IMAGE_FILE_MACHINE_AMD64) {
 585     errs() << "Unsupported image machine type "
 586               "(currently only AMD64 is supported).\n";
 587     return;
 588   }
 589
 590   std::vector<RelocationRef> Rels;
 591   const RuntimeFunction *RFStart;
 592   int NumRFs;
 593   if (!getPDataSection(Obj, Rels, RFStart, NumRFs))
 594     return;
 595   ArrayRef<RuntimeFunction> RFs(RFStart, NumRFs);
 596
 597   bool IsExecutable = Rels.empty();
 598   if (IsExecutable) {
 599     for (const RuntimeFunction &RF : RFs)
 600       printRuntimeFunction(Obj, RF);
 601     return;
 602   }
 603
 604   for (const RuntimeFunction &RF : RFs) {
 605     uint64_t SectionOffset =
 606         std::distance(RFs.begin(), &RF) * sizeof(RuntimeFunction);
 607     printRuntimeFunctionRels(Obj, RF, SectionOffset, Rels);
 608   }
 609 }
 610
 611 void llvm::printCOFFFileHeader(const object::ObjectFile *Obj) {
 612   const COFFObjectFile *file = dyn_cast<const COFFObjectFile>(Obj);
 613   printTLSDirectory(file);
 614   printLoadConfiguration(file);
 615   printImportTables(file);
 616   printExportTable(file);
 617 }
 618
 619 void llvm::printCOFFSymbolTable(const object::COFFImportFile *i) {
 620   unsigned Index = 0;
 621   bool IsCode = i->getCOFFImportHeader()->getType() == COFF::IMPORT_CODE;
 622
 623   for (const object::BasicSymbolRef &Sym : i->symbols()) {
 624     std::string Name;
 625     raw_string_ostream NS(Name);
 626
 627     Sym.printName(NS);
 628     NS.flush();
 629
 630     outs() << "[" << format("%2d", Index) << "]"
 631            << "(sec " << format("%2d", 0) << ")"
 632            << "(fl 0x00)" // Flag bits, which COFF doesn't have.
 633            << "(ty " << format("%3x", (IsCode && Index) ? 32 : 0) << ")"
 634            << "(scl " << format("%3x", 0) << ") "
 635            << "(nx " << 0 << ") "
 636            << "0x" << format("%08x", 0) << " " << Name << '\n';
 637
 638     ++Index;
 639   }
 640 }
 641
 642 void llvm::printCOFFSymbolTable(const COFFObjectFile *coff) {
 643   for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) {
 644     ErrorOr<COFFSymbolRef> Symbol = coff->getSymbol(SI);
 645     StringRef Name;
 646     error(Symbol.getError());
 647     error(coff->getSymbolName(*Symbol, Name));
 648
 649     outs() << "[" << format("%2d", SI) << "]"
 650            << "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")"
 651            << "(fl 0x00)" // Flag bits, which COFF doesn't have.
 652            << "(ty " << format("%3x", unsigned(Symbol->getType())) << ")"
 653            << "(scl " << format("%3x", unsigned(Symbol->getStorageClass())) << ") "
 654            << "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") "
 655            << "0x" << format("%08x", unsigned(Symbol->getValue())) << " "
 656            << Name << "\n";
 657
 658     for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) {
 659       if (Symbol->isSectionDefinition()) {
 660         const coff_aux_section_definition *asd;
 661         error(coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd));
 662
 663         int32_t AuxNumber = asd->getNumber(Symbol->isBigObj());
 664
 665         outs() << "AUX "
 666                << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
 667                          , unsigned(asd->Length)
 668                          , unsigned(asd->NumberOfRelocations)
 669                          , unsigned(asd->NumberOfLinenumbers)
 670                          , unsigned(asd->CheckSum))
 671                << format("assoc %d comdat %d\n"
 672                          , unsigned(AuxNumber)
 673                          , unsigned(asd->Selection));
 674       } else if (Symbol->isFileRecord()) {
 675         const char *FileName;
 676         error(coff->getAuxSymbol<char>(SI + 1, FileName));
 677
 678         StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() *
 679                                      coff->getSymbolTableEntrySize());
 680         outs() << "AUX " << Name.rtrim(StringRef("\0", 1))  << '\n';
 681
 682         SI = SI + Symbol->getNumberOfAuxSymbols();
 683         break;
 684       } else if (Symbol->isWeakExternal()) {
 685         const coff_aux_weak_external *awe;
 686         error(coff->getAuxSymbol<coff_aux_weak_external>(SI + 1, awe));
 687
 688         outs() << "AUX " << format("indx %d srch %d\n",
 689                                    static_cast<uint32_t>(awe->TagIndex),
 690                                    static_cast<uint32_t>(awe->Characteristics));
 691       } else {
 692         outs() << "AUX Unknown\n";
 693       }
 694     }
 695   }
 696 }