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