llvm/tools/obj2yaml/coff2yaml.cpp

   1 //===------ utils/obj2yaml.cpp - obj2yaml conversion tool -------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "obj2yaml.h"
  10 #include "llvm/ADT/StringMap.h"
  11 #include "llvm/DebugInfo/CodeView/DebugChecksumsSubsection.h"
  12 #include "llvm/DebugInfo/CodeView/DebugStringTableSubsection.h"
  13 #include "llvm/DebugInfo/CodeView/StringsAndChecksums.h"
  14 #include "llvm/Object/COFF.h"
  15 #include "llvm/ObjectYAML/COFFYAML.h"
  16 #include "llvm/ObjectYAML/CodeViewYAMLTypes.h"
  17 #include "llvm/Support/ErrorHandling.h"
  18 #include "llvm/Support/YAMLTraits.h"
  19
  20 using namespace llvm;
  21
  22 namespace {
  23
  24 class COFFDumper {
  25   const object::COFFObjectFile &Obj;
  26   COFFYAML::Object YAMLObj;
  27   template <typename T>
  28   void dumpOptionalHeader(T OptionalHeader);
  29   void dumpHeader();
  30   void dumpSections(unsigned numSections);
  31   void dumpSymbols(unsigned numSymbols);
  32
  33 public:
  34   COFFDumper(const object::COFFObjectFile &Obj);
  35   COFFYAML::Object &getYAMLObj();
  36 };
  37
  38 }
  39
  40 COFFDumper::COFFDumper(const object::COFFObjectFile &Obj) : Obj(Obj) {
  41   if (const object::pe32_header *PE32Header = Obj.getPE32Header())
  42     dumpOptionalHeader(PE32Header);
  43   else if (const object::pe32plus_header *PE32PlusHeader =
  44                Obj.getPE32PlusHeader())
  45     dumpOptionalHeader(PE32PlusHeader);
  46
  47   dumpHeader();
  48   dumpSections(Obj.getNumberOfSections());
  49   dumpSymbols(Obj.getNumberOfSymbols());
  50 }
  51
  52 template <typename T> void COFFDumper::dumpOptionalHeader(T OptionalHeader) {
  53   YAMLObj.OptionalHeader = COFFYAML::PEHeader();
  54   YAMLObj.OptionalHeader->Header.AddressOfEntryPoint =
  55       OptionalHeader->AddressOfEntryPoint;
  56   YAMLObj.OptionalHeader->Header.ImageBase = OptionalHeader->ImageBase;
  57   YAMLObj.OptionalHeader->Header.SectionAlignment =
  58       OptionalHeader->SectionAlignment;
  59   YAMLObj.OptionalHeader->Header.FileAlignment = OptionalHeader->FileAlignment;
  60   YAMLObj.OptionalHeader->Header.MajorOperatingSystemVersion =
  61       OptionalHeader->MajorOperatingSystemVersion;
  62   YAMLObj.OptionalHeader->Header.MinorOperatingSystemVersion =
  63       OptionalHeader->MinorOperatingSystemVersion;
  64   YAMLObj.OptionalHeader->Header.MajorImageVersion =
  65       OptionalHeader->MajorImageVersion;
  66   YAMLObj.OptionalHeader->Header.MinorImageVersion =
  67       OptionalHeader->MinorImageVersion;
  68   YAMLObj.OptionalHeader->Header.MajorSubsystemVersion =
  69       OptionalHeader->MajorSubsystemVersion;
  70   YAMLObj.OptionalHeader->Header.MinorSubsystemVersion =
  71       OptionalHeader->MinorSubsystemVersion;
  72   YAMLObj.OptionalHeader->Header.Subsystem = OptionalHeader->Subsystem;
  73   YAMLObj.OptionalHeader->Header.DLLCharacteristics =
  74       OptionalHeader->DLLCharacteristics;
  75   YAMLObj.OptionalHeader->Header.SizeOfStackReserve =
  76       OptionalHeader->SizeOfStackReserve;
  77   YAMLObj.OptionalHeader->Header.SizeOfStackCommit =
  78       OptionalHeader->SizeOfStackCommit;
  79   YAMLObj.OptionalHeader->Header.SizeOfHeapReserve =
  80       OptionalHeader->SizeOfHeapReserve;
  81   YAMLObj.OptionalHeader->Header.SizeOfHeapCommit =
  82       OptionalHeader->SizeOfHeapCommit;
  83   unsigned I = 0;
  84   for (auto &DestDD : YAMLObj.OptionalHeader->DataDirectories) {
  85     const object::data_directory *DD = Obj.getDataDirectory(I++);
  86     if (!DD)
  87       continue;
  88     DestDD = COFF::DataDirectory();
  89     DestDD->RelativeVirtualAddress = DD->RelativeVirtualAddress;
  90     DestDD->Size = DD->Size;
  91   }
  92 }
  93
  94 void COFFDumper::dumpHeader() {
  95   YAMLObj.Header.Machine = Obj.getMachine();
  96   YAMLObj.Header.Characteristics = Obj.getCharacteristics();
  97 }
  98
  99 static void
 100 initializeFileAndStringTable(const llvm::object::COFFObjectFile &Obj,
 101                              codeview::StringsAndChecksumsRef &SC) {
 102
 103   ExitOnError Err("invalid .debug$S section");
 104   // Iterate all .debug$S sections looking for the checksums and string table.
 105   // Exit as soon as both sections are found.
 106   for (const auto &S : Obj.sections()) {
 107     if (SC.hasStrings() && SC.hasChecksums())
 108       break;
 109
 110     Expected<StringRef> SectionNameOrErr = S.getName();
 111     if (!SectionNameOrErr) {
 112       consumeError(SectionNameOrErr.takeError());
 113       continue;
 114     }
 115
 116     ArrayRef<uint8_t> sectionData;
 117     if ((*SectionNameOrErr) != ".debug$S")
 118       continue;
 119
 120     const object::coff_section *COFFSection = Obj.getCOFFSection(S);
 121
 122     cantFail(Obj.getSectionContents(COFFSection, sectionData));
 123
 124     BinaryStreamReader Reader(sectionData, support::little);
 125     uint32_t Magic;
 126
 127     Err(Reader.readInteger(Magic));
 128     assert(Magic == COFF::DEBUG_SECTION_MAGIC && "Invalid .debug$S section!");
 129
 130     codeview::DebugSubsectionArray Subsections;
 131     Err(Reader.readArray(Subsections, Reader.bytesRemaining()));
 132
 133     SC.initialize(Subsections);
 134   }
 135 }
 136
 137 void COFFDumper::dumpSections(unsigned NumSections) {
 138   std::vector<COFFYAML::Section> &YAMLSections = YAMLObj.Sections;
 139   codeview::StringsAndChecksumsRef SC;
 140   initializeFileAndStringTable(Obj, SC);
 141
 142   ExitOnError Err("invalid section table");
 143   StringMap<bool> SymbolUnique;
 144   for (const auto &S : Obj.symbols()) {
 145     StringRef Name = Err(Obj.getSymbolName(Obj.getCOFFSymbol(S)));
 146     StringMap<bool>::iterator It;
 147     bool Inserted;
 148     std::tie(It, Inserted) = SymbolUnique.insert(std::make_pair(Name, true));
 149     if (!Inserted)
 150       It->second = false;
 151   }
 152
 153   for (const auto &ObjSection : Obj.sections()) {
 154     const object::coff_section *COFFSection = Obj.getCOFFSection(ObjSection);
 155     COFFYAML::Section NewYAMLSection;
 156
 157     if (Expected<StringRef> NameOrErr = ObjSection.getName())
 158       NewYAMLSection.Name = *NameOrErr;
 159     else
 160       consumeError(NameOrErr.takeError());
 161
 162     NewYAMLSection.Header.Characteristics = COFFSection->Characteristics;
 163     NewYAMLSection.Header.VirtualAddress = COFFSection->VirtualAddress;
 164     NewYAMLSection.Header.VirtualSize = COFFSection->VirtualSize;
 165     NewYAMLSection.Header.NumberOfLineNumbers =
 166         COFFSection->NumberOfLinenumbers;
 167     NewYAMLSection.Header.NumberOfRelocations =
 168         COFFSection->NumberOfRelocations;
 169     NewYAMLSection.Header.PointerToLineNumbers =
 170         COFFSection->PointerToLinenumbers;
 171     NewYAMLSection.Header.PointerToRawData = COFFSection->PointerToRawData;
 172     NewYAMLSection.Header.PointerToRelocations =
 173         COFFSection->PointerToRelocations;
 174     NewYAMLSection.Header.SizeOfRawData = COFFSection->SizeOfRawData;
 175     uint32_t Shift = (COFFSection->Characteristics >> 20) & 0xF;
 176     NewYAMLSection.Alignment = (1U << Shift) >> 1;
 177     assert(NewYAMLSection.Alignment <= 8192);
 178
 179     ArrayRef<uint8_t> sectionData;
 180     if (!ObjSection.isBSS())
 181       cantFail(Obj.getSectionContents(COFFSection, sectionData));
 182     NewYAMLSection.SectionData = yaml::BinaryRef(sectionData);
 183
 184     if (NewYAMLSection.Name == ".debug$S")
 185       NewYAMLSection.DebugS = CodeViewYAML::fromDebugS(sectionData, SC);
 186     else if (NewYAMLSection.Name == ".debug$T")
 187       NewYAMLSection.DebugT = CodeViewYAML::fromDebugT(sectionData,
 188                                                        NewYAMLSection.Name);
 189     else if (NewYAMLSection.Name == ".debug$P")
 190       NewYAMLSection.DebugP = CodeViewYAML::fromDebugT(sectionData,
 191                                                        NewYAMLSection.Name);
 192     else if (NewYAMLSection.Name == ".debug$H")
 193       NewYAMLSection.DebugH = CodeViewYAML::fromDebugH(sectionData);
 194
 195     std::vector<COFFYAML::Relocation> Relocations;
 196     for (const auto &Reloc : ObjSection.relocations()) {
 197       const object::coff_relocation *reloc = Obj.getCOFFRelocation(Reloc);
 198       COFFYAML::Relocation Rel;
 199       object::symbol_iterator Sym = Reloc.getSymbol();
 200       Expected<StringRef> SymbolNameOrErr = Sym->getName();
 201       if (!SymbolNameOrErr) {
 202        std::string Buf;
 203        raw_string_ostream OS(Buf);
 204        logAllUnhandledErrors(SymbolNameOrErr.takeError(), OS);
 205        OS.flush();
 206        report_fatal_error(Buf);
 207       }
 208       if (SymbolUnique.lookup(*SymbolNameOrErr))
 209         Rel.SymbolName = *SymbolNameOrErr;
 210       else
 211         Rel.SymbolTableIndex = reloc->SymbolTableIndex;
 212       Rel.VirtualAddress = reloc->VirtualAddress;
 213       Rel.Type = reloc->Type;
 214       Relocations.push_back(Rel);
 215     }
 216     NewYAMLSection.Relocations = Relocations;
 217     YAMLSections.push_back(NewYAMLSection);
 218   }
 219 }
 220
 221 static void
 222 dumpFunctionDefinition(COFFYAML::Symbol *Sym,
 223                        const object::coff_aux_function_definition *ObjFD) {
 224   COFF::AuxiliaryFunctionDefinition YAMLFD;
 225   YAMLFD.TagIndex = ObjFD->TagIndex;
 226   YAMLFD.TotalSize = ObjFD->TotalSize;
 227   YAMLFD.PointerToLinenumber = ObjFD->PointerToLinenumber;
 228   YAMLFD.PointerToNextFunction = ObjFD->PointerToNextFunction;
 229
 230   Sym->FunctionDefinition = YAMLFD;
 231 }
 232
 233 static void
 234 dumpbfAndEfLineInfo(COFFYAML::Symbol *Sym,
 235                     const object::coff_aux_bf_and_ef_symbol *ObjBES) {
 236   COFF::AuxiliarybfAndefSymbol YAMLAAS;
 237   YAMLAAS.Linenumber = ObjBES->Linenumber;
 238   YAMLAAS.PointerToNextFunction = ObjBES->PointerToNextFunction;
 239
 240   Sym->bfAndefSymbol = YAMLAAS;
 241 }
 242
 243 static void dumpWeakExternal(COFFYAML::Symbol *Sym,
 244                              const object::coff_aux_weak_external *ObjWE) {
 245   COFF::AuxiliaryWeakExternal YAMLWE;
 246   YAMLWE.TagIndex = ObjWE->TagIndex;
 247   YAMLWE.Characteristics = ObjWE->Characteristics;
 248
 249   Sym->WeakExternal = YAMLWE;
 250 }
 251
 252 static void
 253 dumpSectionDefinition(COFFYAML::Symbol *Sym,
 254                       const object::coff_aux_section_definition *ObjSD,
 255                       bool IsBigObj) {
 256   COFF::AuxiliarySectionDefinition YAMLASD;
 257   int32_t AuxNumber = ObjSD->getNumber(IsBigObj);
 258   YAMLASD.Length = ObjSD->Length;
 259   YAMLASD.NumberOfRelocations = ObjSD->NumberOfRelocations;
 260   YAMLASD.NumberOfLinenumbers = ObjSD->NumberOfLinenumbers;
 261   YAMLASD.CheckSum = ObjSD->CheckSum;
 262   YAMLASD.Number = AuxNumber;
 263   YAMLASD.Selection = ObjSD->Selection;
 264
 265   Sym->SectionDefinition = YAMLASD;
 266 }
 267
 268 static void
 269 dumpCLRTokenDefinition(COFFYAML::Symbol *Sym,
 270                        const object::coff_aux_clr_token *ObjCLRToken) {
 271   COFF::AuxiliaryCLRToken YAMLCLRToken;
 272   YAMLCLRToken.AuxType = ObjCLRToken->AuxType;
 273   YAMLCLRToken.SymbolTableIndex = ObjCLRToken->SymbolTableIndex;
 274
 275   Sym->CLRToken = YAMLCLRToken;
 276 }
 277
 278 void COFFDumper::dumpSymbols(unsigned NumSymbols) {
 279   ExitOnError Err("invalid symbol table");
 280
 281   std::vector<COFFYAML::Symbol> &Symbols = YAMLObj.Symbols;
 282   for (const auto &S : Obj.symbols()) {
 283     object::COFFSymbolRef Symbol = Obj.getCOFFSymbol(S);
 284     COFFYAML::Symbol Sym;
 285     Sym.Name = Err(Obj.getSymbolName(Symbol));
 286     Sym.SimpleType = COFF::SymbolBaseType(Symbol.getBaseType());
 287     Sym.ComplexType = COFF::SymbolComplexType(Symbol.getComplexType());
 288     Sym.Header.StorageClass = Symbol.getStorageClass();
 289     Sym.Header.Value = Symbol.getValue();
 290     Sym.Header.SectionNumber = Symbol.getSectionNumber();
 291     Sym.Header.NumberOfAuxSymbols = Symbol.getNumberOfAuxSymbols();
 292
 293     if (Symbol.getNumberOfAuxSymbols() > 0) {
 294       ArrayRef<uint8_t> AuxData = Obj.getSymbolAuxData(Symbol);
 295       if (Symbol.isFunctionDefinition()) {
 296         // This symbol represents a function definition.
 297         assert(Symbol.getNumberOfAuxSymbols() == 1 &&
 298                "Expected a single aux symbol to describe this function!");
 299
 300         const object::coff_aux_function_definition *ObjFD =
 301             reinterpret_cast<const object::coff_aux_function_definition *>(
 302                 AuxData.data());
 303         dumpFunctionDefinition(&Sym, ObjFD);
 304       } else if (Symbol.isFunctionLineInfo()) {
 305         // This symbol describes function line number information.
 306         assert(Symbol.getNumberOfAuxSymbols() == 1 &&
 307                "Expected a single aux symbol to describe this function!");
 308
 309         const object::coff_aux_bf_and_ef_symbol *ObjBES =
 310             reinterpret_cast<const object::coff_aux_bf_and_ef_symbol *>(
 311                 AuxData.data());
 312         dumpbfAndEfLineInfo(&Sym, ObjBES);
 313       } else if (Symbol.isAnyUndefined()) {
 314         // This symbol represents a weak external definition.
 315         assert(Symbol.getNumberOfAuxSymbols() == 1 &&
 316                "Expected a single aux symbol to describe this weak symbol!");
 317
 318         const object::coff_aux_weak_external *ObjWE =
 319             reinterpret_cast<const object::coff_aux_weak_external *>(
 320                 AuxData.data());
 321         dumpWeakExternal(&Sym, ObjWE);
 322       } else if (Symbol.isFileRecord()) {
 323         // This symbol represents a file record.
 324         Sym.File = StringRef(reinterpret_cast<const char *>(AuxData.data()),
 325                              Symbol.getNumberOfAuxSymbols() *
 326                                  Obj.getSymbolTableEntrySize())
 327                        .rtrim(StringRef("\0", /*length=*/1));
 328       } else if (Symbol.isSectionDefinition()) {
 329         // This symbol represents a section definition.
 330         assert(Symbol.getNumberOfAuxSymbols() == 1 &&
 331                "Expected a single aux symbol to describe this section!");
 332
 333         const object::coff_aux_section_definition *ObjSD =
 334             reinterpret_cast<const object::coff_aux_section_definition *>(
 335                 AuxData.data());
 336         dumpSectionDefinition(&Sym, ObjSD, Symbol.isBigObj());
 337       } else if (Symbol.isCLRToken()) {
 338         // This symbol represents a CLR token definition.
 339         assert(Symbol.getNumberOfAuxSymbols() == 1 &&
 340                "Expected a single aux symbol to describe this CLR Token!");
 341
 342         const object::coff_aux_clr_token *ObjCLRToken =
 343             reinterpret_cast<const object::coff_aux_clr_token *>(
 344                 AuxData.data());
 345         dumpCLRTokenDefinition(&Sym, ObjCLRToken);
 346       } else {
 347         llvm_unreachable("Unhandled auxiliary symbol!");
 348       }
 349     }
 350     Symbols.push_back(Sym);
 351   }
 352 }
 353
 354 COFFYAML::Object &COFFDumper::getYAMLObj() {
 355   return YAMLObj;
 356 }
 357
 358 std::error_code coff2yaml(raw_ostream &Out, const object::COFFObjectFile &Obj) {
 359   COFFDumper Dumper(Obj);
 360
 361   yaml::Output Yout(Out);
 362   Yout << Dumper.getYAMLObj();
 363
 364   return std::error_code();
 365 }