include/llvm/Object/COFF.h

   1 //===- COFF.h - COFF object file implementation -----------------*- 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 // This file declares the COFFObjectFile class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_OBJECT_COFF_H
  15 #define LLVM_OBJECT_COFF_H
  16
  17 #include "llvm/Object/ObjectFile.h"
  18 #include "llvm/Support/COFF.h"
  19 #include "llvm/Support/Endian.h"
  20
  21 namespace llvm {
  22   template <typename T>
  23   class ArrayRef;
  24
  25 namespace object {
  26 class ImportDirectoryEntryRef;
  27 class ExportDirectoryEntryRef;
  28 typedef content_iterator<ImportDirectoryEntryRef> import_directory_iterator;
  29 typedef content_iterator<ExportDirectoryEntryRef> export_directory_iterator;
  30
  31 /// The DOS compatible header at the front of all PE/COFF executables.
  32 struct dos_header {
  33   support::ulittle16_t Magic;
  34   support::ulittle16_t UsedBytesInTheLastPage;
  35   support::ulittle16_t FileSizeInPages;
  36   support::ulittle16_t NumberOfRelocationItems;
  37   support::ulittle16_t HeaderSizeInParagraphs;
  38   support::ulittle16_t MinimumExtraParagraphs;
  39   support::ulittle16_t MaximumExtraParagraphs;
  40   support::ulittle16_t InitialRelativeSS;
  41   support::ulittle16_t InitialSP;
  42   support::ulittle16_t Checksum;
  43   support::ulittle16_t InitialIP;
  44   support::ulittle16_t InitialRelativeCS;
  45   support::ulittle16_t AddressOfRelocationTable;
  46   support::ulittle16_t OverlayNumber;
  47   support::ulittle16_t Reserved[4];
  48   support::ulittle16_t OEMid;
  49   support::ulittle16_t OEMinfo;
  50   support::ulittle16_t Reserved2[10];
  51   support::ulittle32_t AddressOfNewExeHeader;
  52 };
  53
  54 struct coff_file_header {
  55   support::ulittle16_t Machine;
  56   support::ulittle16_t NumberOfSections;
  57   support::ulittle32_t TimeDateStamp;
  58   support::ulittle32_t PointerToSymbolTable;
  59   support::ulittle32_t NumberOfSymbols;
  60   support::ulittle16_t SizeOfOptionalHeader;
  61   support::ulittle16_t Characteristics;
  62
  63   bool isImportLibrary() const { return NumberOfSections == 0xffff; }
  64 };
  65
  66 /// The 32-bit PE header that follows the COFF header.
  67 struct pe32_header {
  68   support::ulittle16_t Magic;
  69   uint8_t  MajorLinkerVersion;
  70   uint8_t  MinorLinkerVersion;
  71   support::ulittle32_t SizeOfCode;
  72   support::ulittle32_t SizeOfInitializedData;
  73   support::ulittle32_t SizeOfUninitializedData;
  74   support::ulittle32_t AddressOfEntryPoint;
  75   support::ulittle32_t BaseOfCode;
  76   support::ulittle32_t BaseOfData;
  77   support::ulittle32_t ImageBase;
  78   support::ulittle32_t SectionAlignment;
  79   support::ulittle32_t FileAlignment;
  80   support::ulittle16_t MajorOperatingSystemVersion;
  81   support::ulittle16_t MinorOperatingSystemVersion;
  82   support::ulittle16_t MajorImageVersion;
  83   support::ulittle16_t MinorImageVersion;
  84   support::ulittle16_t MajorSubsystemVersion;
  85   support::ulittle16_t MinorSubsystemVersion;
  86   support::ulittle32_t Win32VersionValue;
  87   support::ulittle32_t SizeOfImage;
  88   support::ulittle32_t SizeOfHeaders;
  89   support::ulittle32_t CheckSum;
  90   support::ulittle16_t Subsystem;
  91   support::ulittle16_t DLLCharacteristics;
  92   support::ulittle32_t SizeOfStackReserve;
  93   support::ulittle32_t SizeOfStackCommit;
  94   support::ulittle32_t SizeOfHeapReserve;
  95   support::ulittle32_t SizeOfHeapCommit;
  96   support::ulittle32_t LoaderFlags;
  97   support::ulittle32_t NumberOfRvaAndSize;
  98 };
  99
 100 /// The 64-bit PE header that follows the COFF header.
 101 struct pe32plus_header {
 102   support::ulittle16_t Magic;
 103   uint8_t  MajorLinkerVersion;
 104   uint8_t  MinorLinkerVersion;
 105   support::ulittle32_t SizeOfCode;
 106   support::ulittle32_t SizeOfInitializedData;
 107   support::ulittle32_t SizeOfUninitializedData;
 108   support::ulittle32_t AddressOfEntryPoint;
 109   support::ulittle32_t BaseOfCode;
 110   support::ulittle64_t ImageBase;
 111   support::ulittle32_t SectionAlignment;
 112   support::ulittle32_t FileAlignment;
 113   support::ulittle16_t MajorOperatingSystemVersion;
 114   support::ulittle16_t MinorOperatingSystemVersion;
 115   support::ulittle16_t MajorImageVersion;
 116   support::ulittle16_t MinorImageVersion;
 117   support::ulittle16_t MajorSubsystemVersion;
 118   support::ulittle16_t MinorSubsystemVersion;
 119   support::ulittle32_t Win32VersionValue;
 120   support::ulittle32_t SizeOfImage;
 121   support::ulittle32_t SizeOfHeaders;
 122   support::ulittle32_t CheckSum;
 123   support::ulittle16_t Subsystem;
 124   support::ulittle16_t DLLCharacteristics;
 125   support::ulittle64_t SizeOfStackReserve;
 126   support::ulittle64_t SizeOfStackCommit;
 127   support::ulittle64_t SizeOfHeapReserve;
 128   support::ulittle64_t SizeOfHeapCommit;
 129   support::ulittle32_t LoaderFlags;
 130   support::ulittle32_t NumberOfRvaAndSize;
 131 };
 132
 133 struct data_directory {
 134   support::ulittle32_t RelativeVirtualAddress;
 135   support::ulittle32_t Size;
 136 };
 137
 138 struct import_directory_table_entry {
 139   support::ulittle32_t ImportLookupTableRVA;
 140   support::ulittle32_t TimeDateStamp;
 141   support::ulittle32_t ForwarderChain;
 142   support::ulittle32_t NameRVA;
 143   support::ulittle32_t ImportAddressTableRVA;
 144 };
 145
 146 struct import_lookup_table_entry32 {
 147   support::ulittle32_t data;
 148
 149   bool isOrdinal() const { return data & 0x80000000; }
 150
 151   uint16_t getOrdinal() const {
 152     assert(isOrdinal() && "ILT entry is not an ordinal!");
 153     return data & 0xFFFF;
 154   }
 155
 156   uint32_t getHintNameRVA() const {
 157     assert(!isOrdinal() && "ILT entry is not a Hint/Name RVA!");
 158     return data;
 159   }
 160 };
 161
 162 struct export_directory_table_entry {
 163   support::ulittle32_t ExportFlags;
 164   support::ulittle32_t TimeDateStamp;
 165   support::ulittle16_t MajorVersion;
 166   support::ulittle16_t MinorVersion;
 167   support::ulittle32_t NameRVA;
 168   support::ulittle32_t OrdinalBase;
 169   support::ulittle32_t AddressTableEntries;
 170   support::ulittle32_t NumberOfNamePointers;
 171   support::ulittle32_t ExportAddressTableRVA;
 172   support::ulittle32_t NamePointerRVA;
 173   support::ulittle32_t OrdinalTableRVA;
 174 };
 175
 176 union export_address_table_entry {
 177   support::ulittle32_t ExportRVA;
 178   support::ulittle32_t ForwarderRVA;
 179 };
 180
 181 typedef support::ulittle32_t export_name_pointer_table_entry;
 182 typedef support::ulittle16_t export_ordinal_table_entry;
 183
 184 struct coff_symbol {
 185   struct StringTableOffset {
 186     support::ulittle32_t Zeroes;
 187     support::ulittle32_t Offset;
 188   };
 189
 190   union {
 191     char ShortName[8];
 192     StringTableOffset Offset;
 193   } Name;
 194
 195   support::ulittle32_t Value;
 196   support::ulittle16_t SectionNumber;
 197
 198   support::ulittle16_t Type;
 199
 200   support::ulittle8_t  StorageClass;
 201   support::ulittle8_t  NumberOfAuxSymbols;
 202
 203   uint8_t getBaseType() const {
 204     return Type & 0x0F;
 205   }
 206
 207   uint8_t getComplexType() const {
 208     return (Type & 0xF0) >> 4;
 209   }
 210 };
 211
 212 struct coff_section {
 213   char Name[8];
 214   support::ulittle32_t VirtualSize;
 215   support::ulittle32_t VirtualAddress;
 216   support::ulittle32_t SizeOfRawData;
 217   support::ulittle32_t PointerToRawData;
 218   support::ulittle32_t PointerToRelocations;
 219   support::ulittle32_t PointerToLinenumbers;
 220   support::ulittle16_t NumberOfRelocations;
 221   support::ulittle16_t NumberOfLinenumbers;
 222   support::ulittle32_t Characteristics;
 223 };
 224
 225 struct coff_relocation {
 226   support::ulittle32_t VirtualAddress;
 227   support::ulittle32_t SymbolTableIndex;
 228   support::ulittle16_t Type;
 229 };
 230
 231 struct coff_aux_weak_external {
 232   support::ulittle32_t TagIndex;
 233   support::ulittle32_t Characteristics;
 234   char Unused[10];
 235 };
 236
 237 struct coff_aux_section_definition {
 238   support::ulittle32_t Length;
 239   support::ulittle16_t NumberOfRelocations;
 240   support::ulittle16_t NumberOfLinenumbers;
 241   support::ulittle32_t CheckSum;
 242   support::ulittle16_t Number;
 243   support::ulittle8_t Selection;
 244   char Unused[3];
 245 };
 246
 247 struct coff_load_configuration32 {
 248   support::ulittle32_t Characteristics;
 249   support::ulittle32_t TimeDateStamp;
 250   support::ulittle16_t MajorVersion;
 251   support::ulittle16_t MinorVersion;
 252   support::ulittle32_t GlobalFlagsClear;
 253   support::ulittle32_t GlobalFlagsSet;
 254   support::ulittle32_t CriticalSectionDefaultTimeout;
 255   support::ulittle32_t DeCommitFreeBlockThreshold;
 256   support::ulittle32_t DeCommitTotalFreeThreshold;
 257   support::ulittle32_t LockPrefixTable;
 258   support::ulittle32_t MaximumAllocationSize;
 259   support::ulittle32_t VirtualMemoryThreshold;
 260   support::ulittle32_t ProcessAffinityMask;
 261   support::ulittle32_t ProcessHeapFlags;
 262   support::ulittle16_t CSDVersion;
 263   uint16_t Reserved;
 264   support::ulittle32_t EditList;
 265   support::ulittle32_t SecurityCookie;
 266   support::ulittle32_t SEHandlerTable;
 267   support::ulittle32_t SEHandlerCount;
 268 };
 269
 270 struct coff_runtime_function_x64 {
 271   support::ulittle32_t BeginAddress;
 272   support::ulittle32_t EndAddress;
 273   support::ulittle32_t UnwindInformation;
 274 };
 275
 276 class COFFObjectFile : public ObjectFile {
 277 private:
 278   friend class ImportDirectoryEntryRef;
 279   friend class ExportDirectoryEntryRef;
 280   const coff_file_header *COFFHeader;
 281   const pe32_header      *PE32Header;
 282   const pe32plus_header  *PE32PlusHeader;
 283   const data_directory   *DataDirectory;
 284   const coff_section     *SectionTable;
 285   const coff_symbol      *SymbolTable;
 286   const char             *StringTable;
 287         uint32_t          StringTableSize;
 288   const import_directory_table_entry *ImportDirectory;
 289         uint32_t          NumberOfImportDirectory;
 290   const export_directory_table_entry *ExportDirectory;
 291
 292         error_code        getString(uint32_t offset, StringRef &Res) const;
 293
 294   const coff_symbol      *toSymb(DataRefImpl Symb) const;
 295   const coff_section     *toSec(DataRefImpl Sec) const;
 296   const coff_relocation  *toRel(DataRefImpl Rel) const;
 297
 298         error_code        initSymbolTablePtr();
 299         error_code        initImportTablePtr();
 300         error_code        initExportTablePtr();
 301
 302 protected:
 303   void moveSymbolNext(DataRefImpl &Symb) const override;
 304   error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const override;
 305   error_code getSymbolAddress(DataRefImpl Symb, uint64_t &Res) const override;
 306   error_code getSymbolFileOffset(DataRefImpl Symb,
 307                                  uint64_t &Res) const override;
 308   error_code getSymbolSize(DataRefImpl Symb, uint64_t &Res) const override;
 309   uint32_t getSymbolFlags(DataRefImpl Symb) const override;
 310   error_code getSymbolType(DataRefImpl Symb,
 311                            SymbolRef::Type &Res) const override;
 312   error_code getSymbolSection(DataRefImpl Symb,
 313                               section_iterator &Res) const override;
 314   error_code getSymbolValue(DataRefImpl Symb, uint64_t &Val) const override;
 315   void moveSectionNext(DataRefImpl &Sec) const override;
 316   error_code getSectionName(DataRefImpl Sec, StringRef &Res) const override;
 317   error_code getSectionAddress(DataRefImpl Sec, uint64_t &Res) const override;
 318   error_code getSectionSize(DataRefImpl Sec, uint64_t &Res) const override;
 319   error_code getSectionContents(DataRefImpl Sec, StringRef &Res) const override;
 320   error_code getSectionAlignment(DataRefImpl Sec, uint64_t &Res) const override;
 321   error_code isSectionText(DataRefImpl Sec, bool &Res) const override;
 322   error_code isSectionData(DataRefImpl Sec, bool &Res) const override;
 323   error_code isSectionBSS(DataRefImpl Sec, bool &Res) const override;
 324   error_code isSectionVirtual(DataRefImpl Sec, bool &Res) const override;
 325   error_code isSectionZeroInit(DataRefImpl Sec, bool &Res) const override;
 326   error_code isSectionReadOnlyData(DataRefImpl Sec, bool &Res) const override;
 327   error_code isSectionRequiredForExecution(DataRefImpl Sec,
 328                                            bool &Res) const override;
 329   error_code sectionContainsSymbol(DataRefImpl Sec, DataRefImpl Symb,
 330                                    bool &Result) const override;
 331   relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
 332   relocation_iterator section_rel_end(DataRefImpl Sec) const override;
 333
 334   void moveRelocationNext(DataRefImpl &Rel) const override;
 335   error_code getRelocationAddress(DataRefImpl Rel,
 336                                   uint64_t &Res) const override;
 337   error_code getRelocationOffset(DataRefImpl Rel, uint64_t &Res) const override;
 338   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
 339   error_code getRelocationType(DataRefImpl Rel, uint64_t &Res) const override;
 340   error_code getRelocationTypeName(DataRefImpl Rel,
 341                                   SmallVectorImpl<char> &Result) const override;
 342   error_code getRelocationValueString(DataRefImpl Rel,
 343                                   SmallVectorImpl<char> &Result) const override;
 344
 345   error_code getLibraryNext(DataRefImpl LibData,
 346                             LibraryRef &Result) const override;
 347   error_code getLibraryPath(DataRefImpl LibData,
 348                             StringRef &Result) const override;
 349
 350 public:
 351   COFFObjectFile(MemoryBuffer *Object, error_code &EC, bool BufferOwned = true);
 352   basic_symbol_iterator symbol_begin_impl() const override;
 353   basic_symbol_iterator symbol_end_impl() const override;
 354   library_iterator needed_library_begin() const override;
 355   library_iterator needed_library_end() const override;
 356   section_iterator section_begin() const override;
 357   section_iterator section_end() const override;
 358
 359   const coff_section *getCOFFSection(const SectionRef &Section) const;
 360   const coff_symbol *getCOFFSymbol(const SymbolRef &Symbol) const;
 361   const coff_relocation *getCOFFRelocation(const RelocationRef &Reloc) const;
 362
 363   uint8_t getBytesInAddress() const override;
 364   StringRef getFileFormatName() const override;
 365   unsigned getArch() const override;
 366   StringRef getLoadName() const override;
 367
 368   import_directory_iterator import_directory_begin() const;
 369   import_directory_iterator import_directory_end() const;
 370   export_directory_iterator export_directory_begin() const;
 371   export_directory_iterator export_directory_end() const;
 372
 373   error_code getHeader(const coff_file_header *&Res) const;
 374   error_code getCOFFHeader(const coff_file_header *&Res) const;
 375   error_code getPE32Header(const pe32_header *&Res) const;
 376   error_code getPE32PlusHeader(const pe32plus_header *&Res) const;
 377   error_code getDataDirectory(uint32_t index, const data_directory *&Res) const;
 378   error_code getSection(int32_t index, const coff_section *&Res) const;
 379   error_code getSymbol(uint32_t index, const coff_symbol *&Res) const;
 380   template <typename T>
 381   error_code getAuxSymbol(uint32_t index, const T *&Res) const {
 382     const coff_symbol *s;
 383     error_code ec = getSymbol(index, s);
 384     Res = reinterpret_cast<const T*>(s);
 385     return ec;
 386   }
 387   error_code getSymbolName(const coff_symbol *symbol, StringRef &Res) const;
 388   ArrayRef<uint8_t> getSymbolAuxData(const coff_symbol *symbol) const;
 389
 390   error_code getSectionName(const coff_section *Sec, StringRef &Res) const;
 391   error_code getSectionContents(const coff_section *Sec,
 392                                 ArrayRef<uint8_t> &Res) const;
 393
 394   error_code getVaPtr(uint64_t VA, uintptr_t &Res) const;
 395   error_code getRvaPtr(uint32_t Rva, uintptr_t &Res) const;
 396   error_code getHintName(uint32_t Rva, uint16_t &Hint, StringRef &Name) const;
 397
 398   static inline bool classof(const Binary *v) {
 399     return v->isCOFF();
 400   }
 401 };
 402
 403 // The iterator for the import directory table.
 404 class ImportDirectoryEntryRef {
 405 public:
 406   ImportDirectoryEntryRef() : OwningObject(0) {}
 407   ImportDirectoryEntryRef(const import_directory_table_entry *Table, uint32_t I,
 408                           const COFFObjectFile *Owner)
 409       : ImportTable(Table), Index(I), OwningObject(Owner) {}
 410
 411   bool operator==(const ImportDirectoryEntryRef &Other) const;
 412   void moveNext();
 413   error_code getName(StringRef &Result) const;
 414
 415   error_code
 416   getImportTableEntry(const import_directory_table_entry *&Result) const;
 417
 418   error_code
 419   getImportLookupEntry(const import_lookup_table_entry32 *&Result) const;
 420
 421 private:
 422   const import_directory_table_entry *ImportTable;
 423   uint32_t Index;
 424   const COFFObjectFile *OwningObject;
 425 };
 426
 427 // The iterator for the export directory table entry.
 428 class ExportDirectoryEntryRef {
 429 public:
 430   ExportDirectoryEntryRef() : OwningObject(0) {}
 431   ExportDirectoryEntryRef(const export_directory_table_entry *Table, uint32_t I,
 432                           const COFFObjectFile *Owner)
 433       : ExportTable(Table), Index(I), OwningObject(Owner) {}
 434
 435   bool operator==(const ExportDirectoryEntryRef &Other) const;
 436   void moveNext();
 437
 438   error_code getDllName(StringRef &Result) const;
 439   error_code getOrdinalBase(uint32_t &Result) const;
 440   error_code getOrdinal(uint32_t &Result) const;
 441   error_code getExportRVA(uint32_t &Result) const;
 442   error_code getSymbolName(StringRef &Result) const;
 443
 444 private:
 445   const export_directory_table_entry *ExportTable;
 446   uint32_t Index;
 447   const COFFObjectFile *OwningObject;
 448 };
 449 } // end namespace object
 450 } // end namespace llvm
 451
 452 #endif