include/llvm/Object/COFF.h

   1 //===- COFF.h - COFF object file implementation -----------------*- 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 // This file declares the COFFObjectFile class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_OBJECT_COFF_H
  14 #define LLVM_OBJECT_COFF_H
  15
  16 #include "llvm/ADT/iterator_range.h"
  17 #include "llvm/BinaryFormat/COFF.h"
  18 #include "llvm/MC/SubtargetFeature.h"
  19 #include "llvm/Object/Binary.h"
  20 #include "llvm/Object/CVDebugRecord.h"
  21 #include "llvm/Object/Error.h"
  22 #include "llvm/Object/ObjectFile.h"
  23 #include "llvm/Support/BinaryByteStream.h"
  24 #include "llvm/Support/ConvertUTF.h"
  25 #include "llvm/Support/Endian.h"
  26 #include "llvm/Support/ErrorHandling.h"
  27 #include <cassert>
  28 #include <cstddef>
  29 #include <cstdint>
  30 #include <system_error>
  31
  32 namespace llvm {
  33
  34 template <typename T> class ArrayRef;
  35
  36 namespace object {
  37
  38 class BaseRelocRef;
  39 class DelayImportDirectoryEntryRef;
  40 class ExportDirectoryEntryRef;
  41 class ImportDirectoryEntryRef;
  42 class ImportedSymbolRef;
  43 class ResourceSectionRef;
  44
  45 using import_directory_iterator = content_iterator<ImportDirectoryEntryRef>;
  46 using delay_import_directory_iterator =
  47     content_iterator<DelayImportDirectoryEntryRef>;
  48 using export_directory_iterator = content_iterator<ExportDirectoryEntryRef>;
  49 using imported_symbol_iterator = content_iterator<ImportedSymbolRef>;
  50 using base_reloc_iterator = content_iterator<BaseRelocRef>;
  51
  52 /// The DOS compatible header at the front of all PE/COFF executables.
  53 struct dos_header {
  54   char                 Magic[2];
  55   support::ulittle16_t UsedBytesInTheLastPage;
  56   support::ulittle16_t FileSizeInPages;
  57   support::ulittle16_t NumberOfRelocationItems;
  58   support::ulittle16_t HeaderSizeInParagraphs;
  59   support::ulittle16_t MinimumExtraParagraphs;
  60   support::ulittle16_t MaximumExtraParagraphs;
  61   support::ulittle16_t InitialRelativeSS;
  62   support::ulittle16_t InitialSP;
  63   support::ulittle16_t Checksum;
  64   support::ulittle16_t InitialIP;
  65   support::ulittle16_t InitialRelativeCS;
  66   support::ulittle16_t AddressOfRelocationTable;
  67   support::ulittle16_t OverlayNumber;
  68   support::ulittle16_t Reserved[4];
  69   support::ulittle16_t OEMid;
  70   support::ulittle16_t OEMinfo;
  71   support::ulittle16_t Reserved2[10];
  72   support::ulittle32_t AddressOfNewExeHeader;
  73 };
  74
  75 struct coff_file_header {
  76   support::ulittle16_t Machine;
  77   support::ulittle16_t NumberOfSections;
  78   support::ulittle32_t TimeDateStamp;
  79   support::ulittle32_t PointerToSymbolTable;
  80   support::ulittle32_t NumberOfSymbols;
  81   support::ulittle16_t SizeOfOptionalHeader;
  82   support::ulittle16_t Characteristics;
  83
  84   bool isImportLibrary() const { return NumberOfSections == 0xffff; }
  85 };
  86
  87 struct coff_bigobj_file_header {
  88   support::ulittle16_t Sig1;
  89   support::ulittle16_t Sig2;
  90   support::ulittle16_t Version;
  91   support::ulittle16_t Machine;
  92   support::ulittle32_t TimeDateStamp;
  93   uint8_t              UUID[16];
  94   support::ulittle32_t unused1;
  95   support::ulittle32_t unused2;
  96   support::ulittle32_t unused3;
  97   support::ulittle32_t unused4;
  98   support::ulittle32_t NumberOfSections;
  99   support::ulittle32_t PointerToSymbolTable;
 100   support::ulittle32_t NumberOfSymbols;
 101 };
 102
 103 /// The 32-bit PE header that follows the COFF header.
 104 struct pe32_header {
 105   support::ulittle16_t Magic;
 106   uint8_t MajorLinkerVersion;
 107   uint8_t MinorLinkerVersion;
 108   support::ulittle32_t SizeOfCode;
 109   support::ulittle32_t SizeOfInitializedData;
 110   support::ulittle32_t SizeOfUninitializedData;
 111   support::ulittle32_t AddressOfEntryPoint;
 112   support::ulittle32_t BaseOfCode;
 113   support::ulittle32_t BaseOfData;
 114   support::ulittle32_t ImageBase;
 115   support::ulittle32_t SectionAlignment;
 116   support::ulittle32_t FileAlignment;
 117   support::ulittle16_t MajorOperatingSystemVersion;
 118   support::ulittle16_t MinorOperatingSystemVersion;
 119   support::ulittle16_t MajorImageVersion;
 120   support::ulittle16_t MinorImageVersion;
 121   support::ulittle16_t MajorSubsystemVersion;
 122   support::ulittle16_t MinorSubsystemVersion;
 123   support::ulittle32_t Win32VersionValue;
 124   support::ulittle32_t SizeOfImage;
 125   support::ulittle32_t SizeOfHeaders;
 126   support::ulittle32_t CheckSum;
 127   support::ulittle16_t Subsystem;
 128   // FIXME: This should be DllCharacteristics.
 129   support::ulittle16_t DLLCharacteristics;
 130   support::ulittle32_t SizeOfStackReserve;
 131   support::ulittle32_t SizeOfStackCommit;
 132   support::ulittle32_t SizeOfHeapReserve;
 133   support::ulittle32_t SizeOfHeapCommit;
 134   support::ulittle32_t LoaderFlags;
 135   // FIXME: This should be NumberOfRvaAndSizes.
 136   support::ulittle32_t NumberOfRvaAndSize;
 137 };
 138
 139 /// The 64-bit PE header that follows the COFF header.
 140 struct pe32plus_header {
 141   support::ulittle16_t Magic;
 142   uint8_t MajorLinkerVersion;
 143   uint8_t MinorLinkerVersion;
 144   support::ulittle32_t SizeOfCode;
 145   support::ulittle32_t SizeOfInitializedData;
 146   support::ulittle32_t SizeOfUninitializedData;
 147   support::ulittle32_t AddressOfEntryPoint;
 148   support::ulittle32_t BaseOfCode;
 149   support::ulittle64_t ImageBase;
 150   support::ulittle32_t SectionAlignment;
 151   support::ulittle32_t FileAlignment;
 152   support::ulittle16_t MajorOperatingSystemVersion;
 153   support::ulittle16_t MinorOperatingSystemVersion;
 154   support::ulittle16_t MajorImageVersion;
 155   support::ulittle16_t MinorImageVersion;
 156   support::ulittle16_t MajorSubsystemVersion;
 157   support::ulittle16_t MinorSubsystemVersion;
 158   support::ulittle32_t Win32VersionValue;
 159   support::ulittle32_t SizeOfImage;
 160   support::ulittle32_t SizeOfHeaders;
 161   support::ulittle32_t CheckSum;
 162   support::ulittle16_t Subsystem;
 163   support::ulittle16_t DLLCharacteristics;
 164   support::ulittle64_t SizeOfStackReserve;
 165   support::ulittle64_t SizeOfStackCommit;
 166   support::ulittle64_t SizeOfHeapReserve;
 167   support::ulittle64_t SizeOfHeapCommit;
 168   support::ulittle32_t LoaderFlags;
 169   support::ulittle32_t NumberOfRvaAndSize;
 170 };
 171
 172 struct data_directory {
 173   support::ulittle32_t RelativeVirtualAddress;
 174   support::ulittle32_t Size;
 175 };
 176
 177 struct debug_directory {
 178   support::ulittle32_t Characteristics;
 179   support::ulittle32_t TimeDateStamp;
 180   support::ulittle16_t MajorVersion;
 181   support::ulittle16_t MinorVersion;
 182   support::ulittle32_t Type;
 183   support::ulittle32_t SizeOfData;
 184   support::ulittle32_t AddressOfRawData;
 185   support::ulittle32_t PointerToRawData;
 186 };
 187
 188 template <typename IntTy>
 189 struct import_lookup_table_entry {
 190   IntTy Data;
 191
 192   bool isOrdinal() const { return Data < 0; }
 193
 194   uint16_t getOrdinal() const {
 195     assert(isOrdinal() && "ILT entry is not an ordinal!");
 196     return Data & 0xFFFF;
 197   }
 198
 199   uint32_t getHintNameRVA() const {
 200     assert(!isOrdinal() && "ILT entry is not a Hint/Name RVA!");
 201     return Data & 0xFFFFFFFF;
 202   }
 203 };
 204
 205 using import_lookup_table_entry32 =
 206     import_lookup_table_entry<support::little32_t>;
 207 using import_lookup_table_entry64 =
 208     import_lookup_table_entry<support::little64_t>;
 209
 210 struct delay_import_directory_table_entry {
 211   // dumpbin reports this field as "Characteristics" instead of "Attributes".
 212   support::ulittle32_t Attributes;
 213   support::ulittle32_t Name;
 214   support::ulittle32_t ModuleHandle;
 215   support::ulittle32_t DelayImportAddressTable;
 216   support::ulittle32_t DelayImportNameTable;
 217   support::ulittle32_t BoundDelayImportTable;
 218   support::ulittle32_t UnloadDelayImportTable;
 219   support::ulittle32_t TimeStamp;
 220 };
 221
 222 struct export_directory_table_entry {
 223   support::ulittle32_t ExportFlags;
 224   support::ulittle32_t TimeDateStamp;
 225   support::ulittle16_t MajorVersion;
 226   support::ulittle16_t MinorVersion;
 227   support::ulittle32_t NameRVA;
 228   support::ulittle32_t OrdinalBase;
 229   support::ulittle32_t AddressTableEntries;
 230   support::ulittle32_t NumberOfNamePointers;
 231   support::ulittle32_t ExportAddressTableRVA;
 232   support::ulittle32_t NamePointerRVA;
 233   support::ulittle32_t OrdinalTableRVA;
 234 };
 235
 236 union export_address_table_entry {
 237   support::ulittle32_t ExportRVA;
 238   support::ulittle32_t ForwarderRVA;
 239 };
 240
 241 using export_name_pointer_table_entry = support::ulittle32_t;
 242 using export_ordinal_table_entry = support::ulittle16_t;
 243
 244 struct StringTableOffset {
 245   support::ulittle32_t Zeroes;
 246   support::ulittle32_t Offset;
 247 };
 248
 249 template <typename SectionNumberType>
 250 struct coff_symbol {
 251   union {
 252     char ShortName[COFF::NameSize];
 253     StringTableOffset Offset;
 254   } Name;
 255
 256   support::ulittle32_t Value;
 257   SectionNumberType SectionNumber;
 258
 259   support::ulittle16_t Type;
 260
 261   uint8_t StorageClass;
 262   uint8_t NumberOfAuxSymbols;
 263 };
 264
 265 using coff_symbol16 = coff_symbol<support::ulittle16_t>;
 266 using coff_symbol32 = coff_symbol<support::ulittle32_t>;
 267
 268 // Contains only common parts of coff_symbol16 and coff_symbol32.
 269 struct coff_symbol_generic {
 270   union {
 271     char ShortName[COFF::NameSize];
 272     StringTableOffset Offset;
 273   } Name;
 274   support::ulittle32_t Value;
 275 };
 276
 277 struct coff_aux_section_definition;
 278 struct coff_aux_weak_external;
 279
 280 class COFFSymbolRef {
 281 public:
 282   COFFSymbolRef() = default;
 283   COFFSymbolRef(const coff_symbol16 *CS) : CS16(CS) {}
 284   COFFSymbolRef(const coff_symbol32 *CS) : CS32(CS) {}
 285
 286   const void *getRawPtr() const {
 287     return CS16 ? static_cast<const void *>(CS16) : CS32;
 288   }
 289
 290   const coff_symbol_generic *getGeneric() const {
 291     if (CS16)
 292       return reinterpret_cast<const coff_symbol_generic *>(CS16);
 293     return reinterpret_cast<const coff_symbol_generic *>(CS32);
 294   }
 295
 296   friend bool operator<(COFFSymbolRef A, COFFSymbolRef B) {
 297     return A.getRawPtr() < B.getRawPtr();
 298   }
 299
 300   bool isBigObj() const {
 301     if (CS16)
 302       return false;
 303     if (CS32)
 304       return true;
 305     llvm_unreachable("COFFSymbolRef points to nothing!");
 306   }
 307
 308   const char *getShortName() const {
 309     return CS16 ? CS16->Name.ShortName : CS32->Name.ShortName;
 310   }
 311
 312   const StringTableOffset &getStringTableOffset() const {
 313     assert(isSet() && "COFFSymbolRef points to nothing!");
 314     return CS16 ? CS16->Name.Offset : CS32->Name.Offset;
 315   }
 316
 317   uint32_t getValue() const {
 318     assert(isSet() && "COFFSymbolRef points to nothing!");
 319     return CS16 ? CS16->Value : CS32->Value;
 320   }
 321
 322   int32_t getSectionNumber() const {
 323     assert(isSet() && "COFFSymbolRef points to nothing!");
 324     if (CS16) {
 325       // Reserved sections are returned as negative numbers.
 326       if (CS16->SectionNumber <= COFF::MaxNumberOfSections16)
 327         return CS16->SectionNumber;
 328       return static_cast<int16_t>(CS16->SectionNumber);
 329     }
 330     return static_cast<int32_t>(CS32->SectionNumber);
 331   }
 332
 333   uint16_t getType() const {
 334     assert(isSet() && "COFFSymbolRef points to nothing!");
 335     return CS16 ? CS16->Type : CS32->Type;
 336   }
 337
 338   uint8_t getStorageClass() const {
 339     assert(isSet() && "COFFSymbolRef points to nothing!");
 340     return CS16 ? CS16->StorageClass : CS32->StorageClass;
 341   }
 342
 343   uint8_t getNumberOfAuxSymbols() const {
 344     assert(isSet() && "COFFSymbolRef points to nothing!");
 345     return CS16 ? CS16->NumberOfAuxSymbols : CS32->NumberOfAuxSymbols;
 346   }
 347
 348   uint8_t getBaseType() const { return getType() & 0x0F; }
 349
 350   uint8_t getComplexType() const {
 351     return (getType() & 0xF0) >> COFF::SCT_COMPLEX_TYPE_SHIFT;
 352   }
 353
 354   template <typename T> const T *getAux() const {
 355     return CS16 ? reinterpret_cast<const T *>(CS16 + 1)
 356                 : reinterpret_cast<const T *>(CS32 + 1);
 357   }
 358
 359   const coff_aux_section_definition *getSectionDefinition() const {
 360     if (!getNumberOfAuxSymbols() ||
 361         getStorageClass() != COFF::IMAGE_SYM_CLASS_STATIC)
 362       return nullptr;
 363     return getAux<coff_aux_section_definition>();
 364   }
 365
 366   const coff_aux_weak_external *getWeakExternal() const {
 367     if (!getNumberOfAuxSymbols() ||
 368         getStorageClass() != COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
 369       return nullptr;
 370     return getAux<coff_aux_weak_external>();
 371   }
 372
 373   bool isAbsolute() const {
 374     return getSectionNumber() == -1;
 375   }
 376
 377   bool isExternal() const {
 378     return getStorageClass() == COFF::IMAGE_SYM_CLASS_EXTERNAL;
 379   }
 380
 381   bool isCommon() const {
 382     return isExternal() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED &&
 383            getValue() != 0;
 384   }
 385
 386   bool isUndefined() const {
 387     return isExternal() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED &&
 388            getValue() == 0;
 389   }
 390
 391   bool isWeakExternal() const {
 392     return getStorageClass() == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
 393   }
 394
 395   bool isFunctionDefinition() const {
 396     return isExternal() && getBaseType() == COFF::IMAGE_SYM_TYPE_NULL &&
 397            getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION &&
 398            !COFF::isReservedSectionNumber(getSectionNumber());
 399   }
 400
 401   bool isFunctionLineInfo() const {
 402     return getStorageClass() == COFF::IMAGE_SYM_CLASS_FUNCTION;
 403   }
 404
 405   bool isAnyUndefined() const {
 406     return isUndefined() || isWeakExternal();
 407   }
 408
 409   bool isFileRecord() const {
 410     return getStorageClass() == COFF::IMAGE_SYM_CLASS_FILE;
 411   }
 412
 413   bool isSection() const {
 414     return getStorageClass() == COFF::IMAGE_SYM_CLASS_SECTION;
 415   }
 416
 417   bool isSectionDefinition() const {
 418     // C++/CLI creates external ABS symbols for non-const appdomain globals.
 419     // These are also followed by an auxiliary section definition.
 420     bool isAppdomainGlobal =
 421         getStorageClass() == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 422         getSectionNumber() == COFF::IMAGE_SYM_ABSOLUTE;
 423     bool isOrdinarySection = getStorageClass() == COFF::IMAGE_SYM_CLASS_STATIC;
 424     if (!getNumberOfAuxSymbols())
 425       return false;
 426     return isAppdomainGlobal || isOrdinarySection;
 427   }
 428
 429   bool isCLRToken() const {
 430     return getStorageClass() == COFF::IMAGE_SYM_CLASS_CLR_TOKEN;
 431   }
 432
 433 private:
 434   bool isSet() const { return CS16 || CS32; }
 435
 436   const coff_symbol16 *CS16 = nullptr;
 437   const coff_symbol32 *CS32 = nullptr;
 438 };
 439
 440 struct coff_section {
 441   char Name[COFF::NameSize];
 442   support::ulittle32_t VirtualSize;
 443   support::ulittle32_t VirtualAddress;
 444   support::ulittle32_t SizeOfRawData;
 445   support::ulittle32_t PointerToRawData;
 446   support::ulittle32_t PointerToRelocations;
 447   support::ulittle32_t PointerToLinenumbers;
 448   support::ulittle16_t NumberOfRelocations;
 449   support::ulittle16_t NumberOfLinenumbers;
 450   support::ulittle32_t Characteristics;
 451
 452   // Returns true if the actual number of relocations is stored in
 453   // VirtualAddress field of the first relocation table entry.
 454   bool hasExtendedRelocations() const {
 455     return (Characteristics & COFF::IMAGE_SCN_LNK_NRELOC_OVFL) &&
 456            NumberOfRelocations == UINT16_MAX;
 457   }
 458
 459   uint32_t getAlignment() const {
 460     // The IMAGE_SCN_TYPE_NO_PAD bit is a legacy way of getting to
 461     // IMAGE_SCN_ALIGN_1BYTES.
 462     if (Characteristics & COFF::IMAGE_SCN_TYPE_NO_PAD)
 463       return 1;
 464
 465     // Bit [20:24] contains section alignment. 0 means use a default alignment
 466     // of 16.
 467     uint32_t Shift = (Characteristics >> 20) & 0xF;
 468     if (Shift > 0)
 469       return 1U << (Shift - 1);
 470     return 16;
 471   }
 472 };
 473
 474 struct coff_relocation {
 475   support::ulittle32_t VirtualAddress;
 476   support::ulittle32_t SymbolTableIndex;
 477   support::ulittle16_t Type;
 478 };
 479
 480 struct coff_aux_function_definition {
 481   support::ulittle32_t TagIndex;
 482   support::ulittle32_t TotalSize;
 483   support::ulittle32_t PointerToLinenumber;
 484   support::ulittle32_t PointerToNextFunction;
 485   char Unused1[2];
 486 };
 487
 488 static_assert(sizeof(coff_aux_function_definition) == 18,
 489               "auxiliary entry must be 18 bytes");
 490
 491 struct coff_aux_bf_and_ef_symbol {
 492   char Unused1[4];
 493   support::ulittle16_t Linenumber;
 494   char Unused2[6];
 495   support::ulittle32_t PointerToNextFunction;
 496   char Unused3[2];
 497 };
 498
 499 static_assert(sizeof(coff_aux_bf_and_ef_symbol) == 18,
 500               "auxiliary entry must be 18 bytes");
 501
 502 struct coff_aux_weak_external {
 503   support::ulittle32_t TagIndex;
 504   support::ulittle32_t Characteristics;
 505   char Unused1[10];
 506 };
 507
 508 static_assert(sizeof(coff_aux_weak_external) == 18,
 509               "auxiliary entry must be 18 bytes");
 510
 511 struct coff_aux_section_definition {
 512   support::ulittle32_t Length;
 513   support::ulittle16_t NumberOfRelocations;
 514   support::ulittle16_t NumberOfLinenumbers;
 515   support::ulittle32_t CheckSum;
 516   support::ulittle16_t NumberLowPart;
 517   uint8_t              Selection;
 518   uint8_t              Unused;
 519   support::ulittle16_t NumberHighPart;
 520   int32_t getNumber(bool IsBigObj) const {
 521     uint32_t Number = static_cast<uint32_t>(NumberLowPart);
 522     if (IsBigObj)
 523       Number |= static_cast<uint32_t>(NumberHighPart) << 16;
 524     return static_cast<int32_t>(Number);
 525   }
 526 };
 527
 528 static_assert(sizeof(coff_aux_section_definition) == 18,
 529               "auxiliary entry must be 18 bytes");
 530
 531 struct coff_aux_clr_token {
 532   uint8_t              AuxType;
 533   uint8_t              Reserved;
 534   support::ulittle32_t SymbolTableIndex;
 535   char                 MBZ[12];
 536 };
 537
 538 static_assert(sizeof(coff_aux_clr_token) == 18,
 539               "auxiliary entry must be 18 bytes");
 540
 541 struct coff_import_header {
 542   support::ulittle16_t Sig1;
 543   support::ulittle16_t Sig2;
 544   support::ulittle16_t Version;
 545   support::ulittle16_t Machine;
 546   support::ulittle32_t TimeDateStamp;
 547   support::ulittle32_t SizeOfData;
 548   support::ulittle16_t OrdinalHint;
 549   support::ulittle16_t TypeInfo;
 550
 551   int getType() const { return TypeInfo & 0x3; }
 552   int getNameType() const { return (TypeInfo >> 2) & 0x7; }
 553 };
 554
 555 struct coff_import_directory_table_entry {
 556   support::ulittle32_t ImportLookupTableRVA;
 557   support::ulittle32_t TimeDateStamp;
 558   support::ulittle32_t ForwarderChain;
 559   support::ulittle32_t NameRVA;
 560   support::ulittle32_t ImportAddressTableRVA;
 561
 562   bool isNull() const {
 563     return ImportLookupTableRVA == 0 && TimeDateStamp == 0 &&
 564            ForwarderChain == 0 && NameRVA == 0 && ImportAddressTableRVA == 0;
 565   }
 566 };
 567
 568 template <typename IntTy>
 569 struct coff_tls_directory {
 570   IntTy StartAddressOfRawData;
 571   IntTy EndAddressOfRawData;
 572   IntTy AddressOfIndex;
 573   IntTy AddressOfCallBacks;
 574   support::ulittle32_t SizeOfZeroFill;
 575   support::ulittle32_t Characteristics;
 576
 577   uint32_t getAlignment() const {
 578     // Bit [20:24] contains section alignment.
 579     uint32_t Shift = (Characteristics & 0x00F00000) >> 20;
 580     if (Shift > 0)
 581       return 1U << (Shift - 1);
 582     return 0;
 583   }
 584 };
 585
 586 using coff_tls_directory32 = coff_tls_directory<support::little32_t>;
 587 using coff_tls_directory64 = coff_tls_directory<support::little64_t>;
 588
 589 /// Bits in control flow guard flags as we understand them.
 590 enum class coff_guard_flags : uint32_t {
 591   CFInstrumented = 0x00000100,
 592   HasFidTable = 0x00000400,
 593   ProtectDelayLoadIAT = 0x00001000,
 594   DelayLoadIATSection = 0x00002000, // Delay load in separate section
 595   HasLongJmpTable = 0x00010000,
 596   FidTableHasFlags = 0x10000000, // Indicates that fid tables are 5 bytes
 597 };
 598
 599 enum class frame_type : uint16_t { Fpo = 0, Trap = 1, Tss = 2, NonFpo = 3 };
 600
 601 struct coff_load_config_code_integrity {
 602   support::ulittle16_t Flags;
 603   support::ulittle16_t Catalog;
 604   support::ulittle32_t CatalogOffset;
 605   support::ulittle32_t Reserved;
 606 };
 607
 608 /// 32-bit load config (IMAGE_LOAD_CONFIG_DIRECTORY32)
 609 struct coff_load_configuration32 {
 610   support::ulittle32_t Size;
 611   support::ulittle32_t TimeDateStamp;
 612   support::ulittle16_t MajorVersion;
 613   support::ulittle16_t MinorVersion;
 614   support::ulittle32_t GlobalFlagsClear;
 615   support::ulittle32_t GlobalFlagsSet;
 616   support::ulittle32_t CriticalSectionDefaultTimeout;
 617   support::ulittle32_t DeCommitFreeBlockThreshold;
 618   support::ulittle32_t DeCommitTotalFreeThreshold;
 619   support::ulittle32_t LockPrefixTable;
 620   support::ulittle32_t MaximumAllocationSize;
 621   support::ulittle32_t VirtualMemoryThreshold;
 622   support::ulittle32_t ProcessAffinityMask;
 623   support::ulittle32_t ProcessHeapFlags;
 624   support::ulittle16_t CSDVersion;
 625   support::ulittle16_t DependentLoadFlags;
 626   support::ulittle32_t EditList;
 627   support::ulittle32_t SecurityCookie;
 628   support::ulittle32_t SEHandlerTable;
 629   support::ulittle32_t SEHandlerCount;
 630
 631   // Added in MSVC 2015 for /guard:cf.
 632   support::ulittle32_t GuardCFCheckFunction;
 633   support::ulittle32_t GuardCFCheckDispatch;
 634   support::ulittle32_t GuardCFFunctionTable;
 635   support::ulittle32_t GuardCFFunctionCount;
 636   support::ulittle32_t GuardFlags; // coff_guard_flags
 637
 638   // Added in MSVC 2017
 639   coff_load_config_code_integrity CodeIntegrity;
 640   support::ulittle32_t GuardAddressTakenIatEntryTable;
 641   support::ulittle32_t GuardAddressTakenIatEntryCount;
 642   support::ulittle32_t GuardLongJumpTargetTable;
 643   support::ulittle32_t GuardLongJumpTargetCount;
 644   support::ulittle32_t DynamicValueRelocTable;
 645   support::ulittle32_t CHPEMetadataPointer;
 646   support::ulittle32_t GuardRFFailureRoutine;
 647   support::ulittle32_t GuardRFFailureRoutineFunctionPointer;
 648   support::ulittle32_t DynamicValueRelocTableOffset;
 649   support::ulittle16_t DynamicValueRelocTableSection;
 650   support::ulittle16_t Reserved2;
 651   support::ulittle32_t GuardRFVerifyStackPointerFunctionPointer;
 652   support::ulittle32_t HotPatchTableOffset;
 653 };
 654
 655 /// 64-bit load config (IMAGE_LOAD_CONFIG_DIRECTORY64)
 656 struct coff_load_configuration64 {
 657   support::ulittle32_t Size;
 658   support::ulittle32_t TimeDateStamp;
 659   support::ulittle16_t MajorVersion;
 660   support::ulittle16_t MinorVersion;
 661   support::ulittle32_t GlobalFlagsClear;
 662   support::ulittle32_t GlobalFlagsSet;
 663   support::ulittle32_t CriticalSectionDefaultTimeout;
 664   support::ulittle64_t DeCommitFreeBlockThreshold;
 665   support::ulittle64_t DeCommitTotalFreeThreshold;
 666   support::ulittle64_t LockPrefixTable;
 667   support::ulittle64_t MaximumAllocationSize;
 668   support::ulittle64_t VirtualMemoryThreshold;
 669   support::ulittle64_t ProcessAffinityMask;
 670   support::ulittle32_t ProcessHeapFlags;
 671   support::ulittle16_t CSDVersion;
 672   support::ulittle16_t DependentLoadFlags;
 673   support::ulittle64_t EditList;
 674   support::ulittle64_t SecurityCookie;
 675   support::ulittle64_t SEHandlerTable;
 676   support::ulittle64_t SEHandlerCount;
 677
 678   // Added in MSVC 2015 for /guard:cf.
 679   support::ulittle64_t GuardCFCheckFunction;
 680   support::ulittle64_t GuardCFCheckDispatch;
 681   support::ulittle64_t GuardCFFunctionTable;
 682   support::ulittle64_t GuardCFFunctionCount;
 683   support::ulittle32_t GuardFlags;
 684
 685   // Added in MSVC 2017
 686   coff_load_config_code_integrity CodeIntegrity;
 687   support::ulittle64_t GuardAddressTakenIatEntryTable;
 688   support::ulittle64_t GuardAddressTakenIatEntryCount;
 689   support::ulittle64_t GuardLongJumpTargetTable;
 690   support::ulittle64_t GuardLongJumpTargetCount;
 691   support::ulittle64_t DynamicValueRelocTable;
 692   support::ulittle64_t CHPEMetadataPointer;
 693   support::ulittle64_t GuardRFFailureRoutine;
 694   support::ulittle64_t GuardRFFailureRoutineFunctionPointer;
 695   support::ulittle32_t DynamicValueRelocTableOffset;
 696   support::ulittle16_t DynamicValueRelocTableSection;
 697   support::ulittle16_t Reserved2;
 698   support::ulittle64_t GuardRFVerifyStackPointerFunctionPointer;
 699   support::ulittle32_t HotPatchTableOffset;
 700 };
 701
 702 struct coff_runtime_function_x64 {
 703   support::ulittle32_t BeginAddress;
 704   support::ulittle32_t EndAddress;
 705   support::ulittle32_t UnwindInformation;
 706 };
 707
 708 struct coff_base_reloc_block_header {
 709   support::ulittle32_t PageRVA;
 710   support::ulittle32_t BlockSize;
 711 };
 712
 713 struct coff_base_reloc_block_entry {
 714   support::ulittle16_t Data;
 715
 716   int getType() const { return Data >> 12; }
 717   int getOffset() const { return Data & ((1 << 12) - 1); }
 718 };
 719
 720 struct coff_resource_dir_entry {
 721   union {
 722     support::ulittle32_t NameOffset;
 723     support::ulittle32_t ID;
 724     uint32_t getNameOffset() const {
 725       return maskTrailingOnes<uint32_t>(31) & NameOffset;
 726     }
 727     // Even though the PE/COFF spec doesn't mention this, the high bit of a name
 728     // offset is set.
 729     void setNameOffset(uint32_t Offset) { NameOffset = Offset | (1 << 31); }
 730   } Identifier;
 731   union {
 732     support::ulittle32_t DataEntryOffset;
 733     support::ulittle32_t SubdirOffset;
 734
 735     bool isSubDir() const { return SubdirOffset >> 31; }
 736     uint32_t value() const {
 737       return maskTrailingOnes<uint32_t>(31) & SubdirOffset;
 738     }
 739
 740   } Offset;
 741 };
 742
 743 struct coff_resource_data_entry {
 744   support::ulittle32_t DataRVA;
 745   support::ulittle32_t DataSize;
 746   support::ulittle32_t Codepage;
 747   support::ulittle32_t Reserved;
 748 };
 749
 750 struct coff_resource_dir_table {
 751   support::ulittle32_t Characteristics;
 752   support::ulittle32_t TimeDateStamp;
 753   support::ulittle16_t MajorVersion;
 754   support::ulittle16_t MinorVersion;
 755   support::ulittle16_t NumberOfNameEntries;
 756   support::ulittle16_t NumberOfIDEntries;
 757 };
 758
 759 struct debug_h_header {
 760   support::ulittle32_t Magic;
 761   support::ulittle16_t Version;
 762   support::ulittle16_t HashAlgorithm;
 763 };
 764
 765 class COFFObjectFile : public ObjectFile {
 766 private:
 767   friend class ImportDirectoryEntryRef;
 768   friend class ExportDirectoryEntryRef;
 769   const coff_file_header *COFFHeader;
 770   const coff_bigobj_file_header *COFFBigObjHeader;
 771   const pe32_header *PE32Header;
 772   const pe32plus_header *PE32PlusHeader;
 773   const data_directory *DataDirectory;
 774   const coff_section *SectionTable;
 775   const coff_symbol16 *SymbolTable16;
 776   const coff_symbol32 *SymbolTable32;
 777   const char *StringTable;
 778   uint32_t StringTableSize;
 779   const coff_import_directory_table_entry *ImportDirectory;
 780   const delay_import_directory_table_entry *DelayImportDirectory;
 781   uint32_t NumberOfDelayImportDirectory;
 782   const export_directory_table_entry *ExportDirectory;
 783   const coff_base_reloc_block_header *BaseRelocHeader;
 784   const coff_base_reloc_block_header *BaseRelocEnd;
 785   const debug_directory *DebugDirectoryBegin;
 786   const debug_directory *DebugDirectoryEnd;
 787   // Either coff_load_configuration32 or coff_load_configuration64.
 788   const void *LoadConfig = nullptr;
 789
 790   std::error_code getString(uint32_t offset, StringRef &Res) const;
 791
 792   template <typename coff_symbol_type>
 793   const coff_symbol_type *toSymb(DataRefImpl Symb) const;
 794   const coff_section *toSec(DataRefImpl Sec) const;
 795   const coff_relocation *toRel(DataRefImpl Rel) const;
 796
 797   std::error_code initSymbolTablePtr();
 798   std::error_code initImportTablePtr();
 799   std::error_code initDelayImportTablePtr();
 800   std::error_code initExportTablePtr();
 801   std::error_code initBaseRelocPtr();
 802   std::error_code initDebugDirectoryPtr();
 803   std::error_code initLoadConfigPtr();
 804
 805 public:
 806   uintptr_t getSymbolTable() const {
 807     if (SymbolTable16)
 808       return reinterpret_cast<uintptr_t>(SymbolTable16);
 809     if (SymbolTable32)
 810       return reinterpret_cast<uintptr_t>(SymbolTable32);
 811     return uintptr_t(0);
 812   }
 813
 814   uint16_t getMachine() const {
 815     if (COFFHeader)
 816       return COFFHeader->Machine;
 817     if (COFFBigObjHeader)
 818       return COFFBigObjHeader->Machine;
 819     llvm_unreachable("no COFF header!");
 820   }
 821
 822   uint16_t getSizeOfOptionalHeader() const {
 823     if (COFFHeader)
 824       return COFFHeader->isImportLibrary() ? 0
 825                                            : COFFHeader->SizeOfOptionalHeader;
 826     // bigobj doesn't have this field.
 827     if (COFFBigObjHeader)
 828       return 0;
 829     llvm_unreachable("no COFF header!");
 830   }
 831
 832   uint16_t getCharacteristics() const {
 833     if (COFFHeader)
 834       return COFFHeader->isImportLibrary() ? 0 : COFFHeader->Characteristics;
 835     // bigobj doesn't have characteristics to speak of,
 836     // editbin will silently lie to you if you attempt to set any.
 837     if (COFFBigObjHeader)
 838       return 0;
 839     llvm_unreachable("no COFF header!");
 840   }
 841
 842   uint32_t getTimeDateStamp() const {
 843     if (COFFHeader)
 844       return COFFHeader->TimeDateStamp;
 845     if (COFFBigObjHeader)
 846       return COFFBigObjHeader->TimeDateStamp;
 847     llvm_unreachable("no COFF header!");
 848   }
 849
 850   uint32_t getNumberOfSections() const {
 851     if (COFFHeader)
 852       return COFFHeader->isImportLibrary() ? 0 : COFFHeader->NumberOfSections;
 853     if (COFFBigObjHeader)
 854       return COFFBigObjHeader->NumberOfSections;
 855     llvm_unreachable("no COFF header!");
 856   }
 857
 858   uint32_t getPointerToSymbolTable() const {
 859     if (COFFHeader)
 860       return COFFHeader->isImportLibrary() ? 0
 861                                            : COFFHeader->PointerToSymbolTable;
 862     if (COFFBigObjHeader)
 863       return COFFBigObjHeader->PointerToSymbolTable;
 864     llvm_unreachable("no COFF header!");
 865   }
 866
 867   uint32_t getRawNumberOfSymbols() const {
 868     if (COFFHeader)
 869       return COFFHeader->isImportLibrary() ? 0 : COFFHeader->NumberOfSymbols;
 870     if (COFFBigObjHeader)
 871       return COFFBigObjHeader->NumberOfSymbols;
 872     llvm_unreachable("no COFF header!");
 873   }
 874
 875   uint32_t getNumberOfSymbols() const {
 876     if (!SymbolTable16 && !SymbolTable32)
 877       return 0;
 878     return getRawNumberOfSymbols();
 879   }
 880
 881   const coff_load_configuration32 *getLoadConfig32() const {
 882     assert(!is64());
 883     return reinterpret_cast<const coff_load_configuration32 *>(LoadConfig);
 884   }
 885
 886   const coff_load_configuration64 *getLoadConfig64() const {
 887     assert(is64());
 888     return reinterpret_cast<const coff_load_configuration64 *>(LoadConfig);
 889   }
 890   StringRef getRelocationTypeName(uint16_t Type) const;
 891
 892 protected:
 893   void moveSymbolNext(DataRefImpl &Symb) const override;
 894   Expected<StringRef> getSymbolName(DataRefImpl Symb) const override;
 895   Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const override;
 896   uint32_t getSymbolAlignment(DataRefImpl Symb) const override;
 897   uint64_t getSymbolValueImpl(DataRefImpl Symb) const override;
 898   uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const override;
 899   uint32_t getSymbolFlags(DataRefImpl Symb) const override;
 900   Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const override;
 901   Expected<section_iterator> getSymbolSection(DataRefImpl Symb) const override;
 902   void moveSectionNext(DataRefImpl &Sec) const override;
 903   Expected<StringRef> getSectionName(DataRefImpl Sec) const override;
 904   uint64_t getSectionAddress(DataRefImpl Sec) const override;
 905   uint64_t getSectionIndex(DataRefImpl Sec) const override;
 906   uint64_t getSectionSize(DataRefImpl Sec) const override;
 907   Expected<ArrayRef<uint8_t>>
 908   getSectionContents(DataRefImpl Sec) const override;
 909   uint64_t getSectionAlignment(DataRefImpl Sec) const override;
 910   bool isSectionCompressed(DataRefImpl Sec) const override;
 911   bool isSectionText(DataRefImpl Sec) const override;
 912   bool isSectionData(DataRefImpl Sec) const override;
 913   bool isSectionBSS(DataRefImpl Sec) const override;
 914   bool isSectionVirtual(DataRefImpl Sec) const override;
 915   relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
 916   relocation_iterator section_rel_end(DataRefImpl Sec) const override;
 917
 918   void moveRelocationNext(DataRefImpl &Rel) const override;
 919   uint64_t getRelocationOffset(DataRefImpl Rel) const override;
 920   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
 921   uint64_t getRelocationType(DataRefImpl Rel) const override;
 922   void getRelocationTypeName(DataRefImpl Rel,
 923                              SmallVectorImpl<char> &Result) const override;
 924
 925 public:
 926   COFFObjectFile(MemoryBufferRef Object, std::error_code &EC);
 927
 928   basic_symbol_iterator symbol_begin() const override;
 929   basic_symbol_iterator symbol_end() const override;
 930   section_iterator section_begin() const override;
 931   section_iterator section_end() const override;
 932
 933   const coff_section *getCOFFSection(const SectionRef &Section) const;
 934   COFFSymbolRef getCOFFSymbol(const DataRefImpl &Ref) const;
 935   COFFSymbolRef getCOFFSymbol(const SymbolRef &Symbol) const;
 936   const coff_relocation *getCOFFRelocation(const RelocationRef &Reloc) const;
 937   unsigned getSectionID(SectionRef Sec) const;
 938   unsigned getSymbolSectionID(SymbolRef Sym) const;
 939
 940   uint8_t getBytesInAddress() const override;
 941   StringRef getFileFormatName() const override;
 942   Triple::ArchType getArch() const override;
 943   Expected<uint64_t> getStartAddress() const override;
 944   SubtargetFeatures getFeatures() const override { return SubtargetFeatures(); }
 945
 946   import_directory_iterator import_directory_begin() const;
 947   import_directory_iterator import_directory_end() const;
 948   delay_import_directory_iterator delay_import_directory_begin() const;
 949   delay_import_directory_iterator delay_import_directory_end() const;
 950   export_directory_iterator export_directory_begin() const;
 951   export_directory_iterator export_directory_end() const;
 952   base_reloc_iterator base_reloc_begin() const;
 953   base_reloc_iterator base_reloc_end() const;
 954   const debug_directory *debug_directory_begin() const {
 955     return DebugDirectoryBegin;
 956   }
 957   const debug_directory *debug_directory_end() const {
 958     return DebugDirectoryEnd;
 959   }
 960
 961   iterator_range<import_directory_iterator> import_directories() const;
 962   iterator_range<delay_import_directory_iterator>
 963       delay_import_directories() const;
 964   iterator_range<export_directory_iterator> export_directories() const;
 965   iterator_range<base_reloc_iterator> base_relocs() const;
 966   iterator_range<const debug_directory *> debug_directories() const {
 967     return make_range(debug_directory_begin(), debug_directory_end());
 968   }
 969
 970   const dos_header *getDOSHeader() const {
 971     if (!PE32Header && !PE32PlusHeader)
 972       return nullptr;
 973     return reinterpret_cast<const dos_header *>(base());
 974   }
 975
 976   const coff_file_header *getCOFFHeader() const { return COFFHeader; }
 977   const coff_bigobj_file_header *getCOFFBigObjHeader() const {
 978     return COFFBigObjHeader;
 979   }
 980   const pe32_header *getPE32Header() const { return PE32Header; }
 981   const pe32plus_header *getPE32PlusHeader() const { return PE32PlusHeader; }
 982
 983   std::error_code getDataDirectory(uint32_t index,
 984                                    const data_directory *&Res) const;
 985   std::error_code getSection(int32_t index, const coff_section *&Res) const;
 986   std::error_code getSection(StringRef SectionName,
 987                              const coff_section *&Res) const;
 988
 989   template <typename coff_symbol_type>
 990   std::error_code getSymbol(uint32_t Index,
 991                             const coff_symbol_type *&Res) const {
 992     if (Index >= getNumberOfSymbols())
 993       return object_error::parse_failed;
 994
 995     Res = reinterpret_cast<coff_symbol_type *>(getSymbolTable()) + Index;
 996     return std::error_code();
 997   }
 998   Expected<COFFSymbolRef> getSymbol(uint32_t index) const {
 999     if (SymbolTable16) {
1000       const coff_symbol16 *Symb = nullptr;
1001       if (std::error_code EC = getSymbol(index, Symb))
1002         return errorCodeToError(EC);
1003       return COFFSymbolRef(Symb);
1004     }
1005     if (SymbolTable32) {
1006       const coff_symbol32 *Symb = nullptr;
1007       if (std::error_code EC = getSymbol(index, Symb))
1008         return errorCodeToError(EC);
1009       return COFFSymbolRef(Symb);
1010     }
1011     return errorCodeToError(object_error::parse_failed);
1012   }
1013
1014   template <typename T>
1015   std::error_code getAuxSymbol(uint32_t index, const T *&Res) const {
1016     Expected<COFFSymbolRef> S = getSymbol(index);
1017     if (Error E = S.takeError())
1018       return errorToErrorCode(std::move(E));
1019     Res = reinterpret_cast<const T *>(S->getRawPtr());
1020     return std::error_code();
1021   }
1022
1023   std::error_code getSymbolName(COFFSymbolRef Symbol, StringRef &Res) const;
1024   std::error_code getSymbolName(const coff_symbol_generic *Symbol,
1025                                 StringRef &Res) const;
1026
1027   ArrayRef<uint8_t> getSymbolAuxData(COFFSymbolRef Symbol) const;
1028
1029   uint32_t getSymbolIndex(COFFSymbolRef Symbol) const;
1030
1031   size_t getSymbolTableEntrySize() const {
1032     if (COFFHeader)
1033       return sizeof(coff_symbol16);
1034     if (COFFBigObjHeader)
1035       return sizeof(coff_symbol32);
1036     llvm_unreachable("null symbol table pointer!");
1037   }
1038
1039   ArrayRef<coff_relocation> getRelocations(const coff_section *Sec) const;
1040
1041   Expected<StringRef> getSectionName(const coff_section *Sec) const;
1042   uint64_t getSectionSize(const coff_section *Sec) const;
1043   Error getSectionContents(const coff_section *Sec,
1044                            ArrayRef<uint8_t> &Res) const;
1045
1046   uint64_t getImageBase() const;
1047   std::error_code getVaPtr(uint64_t VA, uintptr_t &Res) const;
1048   std::error_code getRvaPtr(uint32_t Rva, uintptr_t &Res) const;
1049
1050   /// Given an RVA base and size, returns a valid array of bytes or an error
1051   /// code if the RVA and size is not contained completely within a valid
1052   /// section.
1053   std::error_code getRvaAndSizeAsBytes(uint32_t RVA, uint32_t Size,
1054                                        ArrayRef<uint8_t> &Contents) const;
1055
1056   std::error_code getHintName(uint32_t Rva, uint16_t &Hint,
1057                               StringRef &Name) const;
1058
1059   /// Get PDB information out of a codeview debug directory entry.
1060   std::error_code getDebugPDBInfo(const debug_directory *DebugDir,
1061                                   const codeview::DebugInfo *&Info,
1062                                   StringRef &PDBFileName) const;
1063
1064   /// Get PDB information from an executable. If the information is not present,
1065   /// Info will be set to nullptr and PDBFileName will be empty. An error is
1066   /// returned only on corrupt object files. Convenience accessor that can be
1067   /// used if the debug directory is not already handy.
1068   std::error_code getDebugPDBInfo(const codeview::DebugInfo *&Info,
1069                                   StringRef &PDBFileName) const;
1070
1071   bool isRelocatableObject() const override;
1072   bool is64() const { return PE32PlusHeader; }
1073
1074   StringRef mapDebugSectionName(StringRef Name) const override;
1075
1076   static bool classof(const Binary *v) { return v->isCOFF(); }
1077 };
1078
1079 // The iterator for the import directory table.
1080 class ImportDirectoryEntryRef {
1081 public:
1082   ImportDirectoryEntryRef() = default;
1083   ImportDirectoryEntryRef(const coff_import_directory_table_entry *Table,
1084                           uint32_t I, const COFFObjectFile *Owner)
1085       : ImportTable(Table), Index(I), OwningObject(Owner) {}
1086
1087   bool operator==(const ImportDirectoryEntryRef &Other) const;
1088   void moveNext();
1089
1090   imported_symbol_iterator imported_symbol_begin() const;
1091   imported_symbol_iterator imported_symbol_end() const;
1092   iterator_range<imported_symbol_iterator> imported_symbols() const;
1093
1094   imported_symbol_iterator lookup_table_begin() const;
1095   imported_symbol_iterator lookup_table_end() const;
1096   iterator_range<imported_symbol_iterator> lookup_table_symbols() const;
1097
1098   std::error_code getName(StringRef &Result) const;
1099   std::error_code getImportLookupTableRVA(uint32_t &Result) const;
1100   std::error_code getImportAddressTableRVA(uint32_t &Result) const;
1101
1102   std::error_code
1103   getImportTableEntry(const coff_import_directory_table_entry *&Result) const;
1104
1105 private:
1106   const coff_import_directory_table_entry *ImportTable;
1107   uint32_t Index;
1108   const COFFObjectFile *OwningObject = nullptr;
1109 };
1110
1111 class DelayImportDirectoryEntryRef {
1112 public:
1113   DelayImportDirectoryEntryRef() = default;
1114   DelayImportDirectoryEntryRef(const delay_import_directory_table_entry *T,
1115                                uint32_t I, const COFFObjectFile *Owner)
1116       : Table(T), Index(I), OwningObject(Owner) {}
1117
1118   bool operator==(const DelayImportDirectoryEntryRef &Other) const;
1119   void moveNext();
1120
1121   imported_symbol_iterator imported_symbol_begin() const;
1122   imported_symbol_iterator imported_symbol_end() const;
1123   iterator_range<imported_symbol_iterator> imported_symbols() const;
1124
1125   std::error_code getName(StringRef &Result) const;
1126   std::error_code getDelayImportTable(
1127       const delay_import_directory_table_entry *&Result) const;
1128   std::error_code getImportAddress(int AddrIndex, uint64_t &Result) const;
1129
1130 private:
1131   const delay_import_directory_table_entry *Table;
1132   uint32_t Index;
1133   const COFFObjectFile *OwningObject = nullptr;
1134 };
1135
1136 // The iterator for the export directory table entry.
1137 class ExportDirectoryEntryRef {
1138 public:
1139   ExportDirectoryEntryRef() = default;
1140   ExportDirectoryEntryRef(const export_directory_table_entry *Table, uint32_t I,
1141                           const COFFObjectFile *Owner)
1142       : ExportTable(Table), Index(I), OwningObject(Owner) {}
1143
1144   bool operator==(const ExportDirectoryEntryRef &Other) const;
1145   void moveNext();
1146
1147   std::error_code getDllName(StringRef &Result) const;
1148   std::error_code getOrdinalBase(uint32_t &Result) const;
1149   std::error_code getOrdinal(uint32_t &Result) const;
1150   std::error_code getExportRVA(uint32_t &Result) const;
1151   std::error_code getSymbolName(StringRef &Result) const;
1152
1153   std::error_code isForwarder(bool &Result) const;
1154   std::error_code getForwardTo(StringRef &Result) const;
1155
1156 private:
1157   const export_directory_table_entry *ExportTable;
1158   uint32_t Index;
1159   const COFFObjectFile *OwningObject = nullptr;
1160 };
1161
1162 class ImportedSymbolRef {
1163 public:
1164   ImportedSymbolRef() = default;
1165   ImportedSymbolRef(const import_lookup_table_entry32 *Entry, uint32_t I,
1166                     const COFFObjectFile *Owner)
1167       : Entry32(Entry), Entry64(nullptr), Index(I), OwningObject(Owner) {}
1168   ImportedSymbolRef(const import_lookup_table_entry64 *Entry, uint32_t I,
1169                     const COFFObjectFile *Owner)
1170       : Entry32(nullptr), Entry64(Entry), Index(I), OwningObject(Owner) {}
1171
1172   bool operator==(const ImportedSymbolRef &Other) const;
1173   void moveNext();
1174
1175   std::error_code getSymbolName(StringRef &Result) const;
1176   std::error_code isOrdinal(bool &Result) const;
1177   std::error_code getOrdinal(uint16_t &Result) const;
1178   std::error_code getHintNameRVA(uint32_t &Result) const;
1179
1180 private:
1181   const import_lookup_table_entry32 *Entry32;
1182   const import_lookup_table_entry64 *Entry64;
1183   uint32_t Index;
1184   const COFFObjectFile *OwningObject = nullptr;
1185 };
1186
1187 class BaseRelocRef {
1188 public:
1189   BaseRelocRef() = default;
1190   BaseRelocRef(const coff_base_reloc_block_header *Header,
1191                const COFFObjectFile *Owner)
1192       : Header(Header), Index(0) {}
1193
1194   bool operator==(const BaseRelocRef &Other) const;
1195   void moveNext();
1196
1197   std::error_code getType(uint8_t &Type) const;
1198   std::error_code getRVA(uint32_t &Result) const;
1199
1200 private:
1201   const coff_base_reloc_block_header *Header;
1202   uint32_t Index;
1203 };
1204
1205 class ResourceSectionRef {
1206 public:
1207   ResourceSectionRef() = default;
1208   explicit ResourceSectionRef(StringRef Ref) : BBS(Ref, support::little) {}
1209
1210   Error load(const COFFObjectFile *O);
1211   Error load(const COFFObjectFile *O, const SectionRef &S);
1212
1213   Expected<ArrayRef<UTF16>>
1214   getEntryNameString(const coff_resource_dir_entry &Entry);
1215   Expected<const coff_resource_dir_table &>
1216   getEntrySubDir(const coff_resource_dir_entry &Entry);
1217   Expected<const coff_resource_data_entry &>
1218   getEntryData(const coff_resource_dir_entry &Entry);
1219   Expected<const coff_resource_dir_table &> getBaseTable();
1220   Expected<const coff_resource_dir_entry &>
1221   getTableEntry(const coff_resource_dir_table &Table, uint32_t Index);
1222
1223   Expected<StringRef> getContents(const coff_resource_data_entry &Entry);
1224
1225 private:
1226   BinaryByteStream BBS;
1227
1228   SectionRef Section;
1229   const COFFObjectFile *Obj;
1230
1231   std::vector<const coff_relocation *> Relocs;
1232
1233   Expected<const coff_resource_dir_table &> getTableAtOffset(uint32_t Offset);
1234   Expected<const coff_resource_dir_entry &>
1235   getTableEntryAtOffset(uint32_t Offset);
1236   Expected<const coff_resource_data_entry &>
1237   getDataEntryAtOffset(uint32_t Offset);
1238   Expected<ArrayRef<UTF16>> getDirStringAtOffset(uint32_t Offset);
1239 };
1240
1241 // Corresponds to `_FPO_DATA` structure in the PE/COFF spec.
1242 struct FpoData {
1243   support::ulittle32_t Offset; // ulOffStart: Offset 1st byte of function code
1244   support::ulittle32_t Size;   // cbProcSize: # bytes in function
1245   support::ulittle32_t NumLocals; // cdwLocals: # bytes in locals/4
1246   support::ulittle16_t NumParams; // cdwParams: # bytes in params/4
1247   support::ulittle16_t Attributes;
1248
1249   // cbProlog: # bytes in prolog
1250   int getPrologSize() const { return Attributes & 0xF; }
1251
1252   // cbRegs: # regs saved
1253   int getNumSavedRegs() const { return (Attributes >> 8) & 0x7; }
1254
1255   // fHasSEH: true if seh is func
1256   bool hasSEH() const { return (Attributes >> 9) & 1; }
1257
1258   // fUseBP: true if EBP has been allocated
1259   bool useBP() const { return (Attributes >> 10) & 1; }
1260
1261   // cbFrame: frame pointer
1262   frame_type getFP() const { return static_cast<frame_type>(Attributes >> 14); }
1263 };
1264
1265 } // end namespace object
1266
1267 } // end namespace llvm
1268
1269 #endif // LLVM_OBJECT_COFF_H