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