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 { return CS16 ? CS16->Value : CS32->Value; }
 318
 319   int32_t getSectionNumber() const {
 320     assert(isSet() && "COFFSymbolRef points to nothing!");
 321     if (CS16) {
 322       // Reserved sections are returned as negative numbers.
 323       if (CS16->SectionNumber <= COFF::MaxNumberOfSections16)
 324         return CS16->SectionNumber;
 325       return static_cast<int16_t>(CS16->SectionNumber);
 326     }
 327     return static_cast<int32_t>(CS32->SectionNumber);
 328   }
 329
 330   uint16_t getType() const {
 331     assert(isSet() && "COFFSymbolRef points to nothing!");
 332     return CS16 ? CS16->Type : CS32->Type;
 333   }
 334
 335   uint8_t getStorageClass() const {
 336     assert(isSet() && "COFFSymbolRef points to nothing!");
 337     return CS16 ? CS16->StorageClass : CS32->StorageClass;
 338   }
 339
 340   uint8_t getNumberOfAuxSymbols() const {
 341     assert(isSet() && "COFFSymbolRef points to nothing!");
 342     return CS16 ? CS16->NumberOfAuxSymbols : CS32->NumberOfAuxSymbols;
 343   }
 344
 345   uint8_t getBaseType() const { return getType() & 0x0F; }
 346
 347   uint8_t getComplexType() const {
 348     return (getType() & 0xF0) >> COFF::SCT_COMPLEX_TYPE_SHIFT;
 349   }
 350
 351   template <typename T> const T *getAux() const {
 352     return CS16 ? reinterpret_cast<const T *>(CS16 + 1)
 353                 : reinterpret_cast<const T *>(CS32 + 1);
 354   }
 355
 356   const coff_aux_section_definition *getSectionDefinition() const {
 357     if (!getNumberOfAuxSymbols() ||
 358         getStorageClass() != COFF::IMAGE_SYM_CLASS_STATIC)
 359       return nullptr;
 360     return getAux<coff_aux_section_definition>();
 361   }
 362
 363   const coff_aux_weak_external *getWeakExternal() const {
 364     if (!getNumberOfAuxSymbols() ||
 365         getStorageClass() != COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL)
 366       return nullptr;
 367     return getAux<coff_aux_weak_external>();
 368   }
 369
 370   bool isAbsolute() const {
 371     return getSectionNumber() == -1;
 372   }
 373
 374   bool isExternal() const {
 375     return getStorageClass() == COFF::IMAGE_SYM_CLASS_EXTERNAL;
 376   }
 377
 378   bool isCommon() const {
 379     return isExternal() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED &&
 380            getValue() != 0;
 381   }
 382
 383   bool isUndefined() const {
 384     return isExternal() && getSectionNumber() == COFF::IMAGE_SYM_UNDEFINED &&
 385            getValue() == 0;
 386   }
 387
 388   bool isWeakExternal() const {
 389     return getStorageClass() == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL;
 390   }
 391
 392   bool isFunctionDefinition() const {
 393     return isExternal() && getBaseType() == COFF::IMAGE_SYM_TYPE_NULL &&
 394            getComplexType() == COFF::IMAGE_SYM_DTYPE_FUNCTION &&
 395            !COFF::isReservedSectionNumber(getSectionNumber());
 396   }
 397
 398   bool isFunctionLineInfo() const {
 399     return getStorageClass() == COFF::IMAGE_SYM_CLASS_FUNCTION;
 400   }
 401
 402   bool isAnyUndefined() const {
 403     return isUndefined() || isWeakExternal();
 404   }
 405
 406   bool isFileRecord() const {
 407     return getStorageClass() == COFF::IMAGE_SYM_CLASS_FILE;
 408   }
 409
 410   bool isSection() const {
 411     return getStorageClass() == COFF::IMAGE_SYM_CLASS_SECTION;
 412   }
 413
 414   bool isSectionDefinition() const {
 415     // C++/CLI creates external ABS symbols for non-const appdomain globals.
 416     // These are also followed by an auxiliary section definition.
 417     bool isAppdomainGlobal =
 418         getStorageClass() == COFF::IMAGE_SYM_CLASS_EXTERNAL &&
 419         getSectionNumber() == COFF::IMAGE_SYM_ABSOLUTE;
 420     bool isOrdinarySection = getStorageClass() == COFF::IMAGE_SYM_CLASS_STATIC;
 421     if (!getNumberOfAuxSymbols())
 422       return false;
 423     return isAppdomainGlobal || isOrdinarySection;
 424   }
 425
 426   bool isCLRToken() const {
 427     return getStorageClass() == COFF::IMAGE_SYM_CLASS_CLR_TOKEN;
 428   }
 429
 430 private:
 431   bool isSet() const { return CS16 || CS32; }
 432
 433   const coff_symbol16 *CS16 = nullptr;
 434   const coff_symbol32 *CS32 = nullptr;
 435 };
 436
 437 struct coff_section {
 438   char Name[COFF::NameSize];
 439   support::ulittle32_t VirtualSize;
 440   support::ulittle32_t VirtualAddress;
 441   support::ulittle32_t SizeOfRawData;
 442   support::ulittle32_t PointerToRawData;
 443   support::ulittle32_t PointerToRelocations;
 444   support::ulittle32_t PointerToLinenumbers;
 445   support::ulittle16_t NumberOfRelocations;
 446   support::ulittle16_t NumberOfLinenumbers;
 447   support::ulittle32_t Characteristics;
 448
 449   // Returns true if the actual number of relocations is stored in
 450   // VirtualAddress field of the first relocation table entry.
 451   bool hasExtendedRelocations() const {
 452     return (Characteristics & COFF::IMAGE_SCN_LNK_NRELOC_OVFL) &&
 453            NumberOfRelocations == UINT16_MAX;
 454   }
 455
 456   uint32_t getAlignment() const {
 457     // The IMAGE_SCN_TYPE_NO_PAD bit is a legacy way of getting to
 458     // IMAGE_SCN_ALIGN_1BYTES.
 459     if (Characteristics & COFF::IMAGE_SCN_TYPE_NO_PAD)
 460       return 1;
 461
 462     // Bit [20:24] contains section alignment. 0 means use a default alignment
 463     // of 16.
 464     uint32_t Shift = (Characteristics >> 20) & 0xF;
 465     if (Shift > 0)
 466       return 1U << (Shift - 1);
 467     return 16;
 468   }
 469 };
 470
 471 struct coff_relocation {
 472   support::ulittle32_t VirtualAddress;
 473   support::ulittle32_t SymbolTableIndex;
 474   support::ulittle16_t Type;
 475 };
 476
 477 struct coff_aux_function_definition {
 478   support::ulittle32_t TagIndex;
 479   support::ulittle32_t TotalSize;
 480   support::ulittle32_t PointerToLinenumber;
 481   support::ulittle32_t PointerToNextFunction;
 482   char Unused1[2];
 483 };
 484
 485 static_assert(sizeof(coff_aux_function_definition) == 18,
 486               "auxiliary entry must be 18 bytes");
 487
 488 struct coff_aux_bf_and_ef_symbol {
 489   char Unused1[4];
 490   support::ulittle16_t Linenumber;
 491   char Unused2[6];
 492   support::ulittle32_t PointerToNextFunction;
 493   char Unused3[2];
 494 };
 495
 496 static_assert(sizeof(coff_aux_bf_and_ef_symbol) == 18,
 497               "auxiliary entry must be 18 bytes");
 498
 499 struct coff_aux_weak_external {
 500   support::ulittle32_t TagIndex;
 501   support::ulittle32_t Characteristics;
 502   char Unused1[10];
 503 };
 504
 505 static_assert(sizeof(coff_aux_weak_external) == 18,
 506               "auxiliary entry must be 18 bytes");
 507
 508 struct coff_aux_section_definition {
 509   support::ulittle32_t Length;
 510   support::ulittle16_t NumberOfRelocations;
 511   support::ulittle16_t NumberOfLinenumbers;
 512   support::ulittle32_t CheckSum;
 513   support::ulittle16_t NumberLowPart;
 514   uint8_t              Selection;
 515   uint8_t              Unused;
 516   support::ulittle16_t NumberHighPart;
 517   int32_t getNumber(bool IsBigObj) const {
 518     uint32_t Number = static_cast<uint32_t>(NumberLowPart);
 519     if (IsBigObj)
 520       Number |= static_cast<uint32_t>(NumberHighPart) << 16;
 521     return static_cast<int32_t>(Number);
 522   }
 523 };
 524
 525 static_assert(sizeof(coff_aux_section_definition) == 18,
 526               "auxiliary entry must be 18 bytes");
 527
 528 struct coff_aux_clr_token {
 529   uint8_t              AuxType;
 530   uint8_t              Reserved;
 531   support::ulittle32_t SymbolTableIndex;
 532   char                 MBZ[12];
 533 };
 534
 535 static_assert(sizeof(coff_aux_clr_token) == 18,
 536               "auxiliary entry must be 18 bytes");
 537
 538 struct coff_import_header {
 539   support::ulittle16_t Sig1;
 540   support::ulittle16_t Sig2;
 541   support::ulittle16_t Version;
 542   support::ulittle16_t Machine;
 543   support::ulittle32_t TimeDateStamp;
 544   support::ulittle32_t SizeOfData;
 545   support::ulittle16_t OrdinalHint;
 546   support::ulittle16_t TypeInfo;
 547
 548   int getType() const { return TypeInfo & 0x3; }
 549   int getNameType() const { return (TypeInfo >> 2) & 0x7; }
 550 };
 551
 552 struct coff_import_directory_table_entry {
 553   support::ulittle32_t ImportLookupTableRVA;
 554   support::ulittle32_t TimeDateStamp;
 555   support::ulittle32_t ForwarderChain;
 556   support::ulittle32_t NameRVA;
 557   support::ulittle32_t ImportAddressTableRVA;
 558
 559   bool isNull() const {
 560     return ImportLookupTableRVA == 0 && TimeDateStamp == 0 &&
 561            ForwarderChain == 0 && NameRVA == 0 && ImportAddressTableRVA == 0;
 562   }
 563 };
 564
 565 template <typename IntTy>
 566 struct coff_tls_directory {
 567   IntTy StartAddressOfRawData;
 568   IntTy EndAddressOfRawData;
 569   IntTy AddressOfIndex;
 570   IntTy AddressOfCallBacks;
 571   support::ulittle32_t SizeOfZeroFill;
 572   support::ulittle32_t Characteristics;
 573
 574   uint32_t getAlignment() const {
 575     // Bit [20:24] contains section alignment.
 576     uint32_t Shift = (Characteristics & 0x00F00000) >> 20;
 577     if (Shift > 0)
 578       return 1U << (Shift - 1);
 579     return 0;
 580   }
 581 };
 582
 583 using coff_tls_directory32 = coff_tls_directory<support::little32_t>;
 584 using coff_tls_directory64 = coff_tls_directory<support::little64_t>;
 585
 586 /// Bits in control flow guard flags as we understand them.
 587 enum class coff_guard_flags : uint32_t {
 588   CFInstrumented = 0x00000100,
 589   HasFidTable = 0x00000400,
 590   ProtectDelayLoadIAT = 0x00001000,
 591   DelayLoadIATSection = 0x00002000, // Delay load in separate section
 592   HasLongJmpTable = 0x00010000,
 593   FidTableHasFlags = 0x10000000, // Indicates that fid tables are 5 bytes
 594 };
 595
 596 enum class frame_type : uint16_t { Fpo = 0, Trap = 1, Tss = 2, NonFpo = 3 };
 597
 598 struct coff_load_config_code_integrity {
 599   support::ulittle16_t Flags;
 600   support::ulittle16_t Catalog;
 601   support::ulittle32_t CatalogOffset;
 602   support::ulittle32_t Reserved;
 603 };
 604
 605 /// 32-bit load config (IMAGE_LOAD_CONFIG_DIRECTORY32)
 606 struct coff_load_configuration32 {
 607   support::ulittle32_t Size;
 608   support::ulittle32_t TimeDateStamp;
 609   support::ulittle16_t MajorVersion;
 610   support::ulittle16_t MinorVersion;
 611   support::ulittle32_t GlobalFlagsClear;
 612   support::ulittle32_t GlobalFlagsSet;
 613   support::ulittle32_t CriticalSectionDefaultTimeout;
 614   support::ulittle32_t DeCommitFreeBlockThreshold;
 615   support::ulittle32_t DeCommitTotalFreeThreshold;
 616   support::ulittle32_t LockPrefixTable;
 617   support::ulittle32_t MaximumAllocationSize;
 618   support::ulittle32_t VirtualMemoryThreshold;
 619   support::ulittle32_t ProcessAffinityMask;
 620   support::ulittle32_t ProcessHeapFlags;
 621   support::ulittle16_t CSDVersion;
 622   support::ulittle16_t DependentLoadFlags;
 623   support::ulittle32_t EditList;
 624   support::ulittle32_t SecurityCookie;
 625   support::ulittle32_t SEHandlerTable;
 626   support::ulittle32_t SEHandlerCount;
 627
 628   // Added in MSVC 2015 for /guard:cf.
 629   support::ulittle32_t GuardCFCheckFunction;
 630   support::ulittle32_t GuardCFCheckDispatch;
 631   support::ulittle32_t GuardCFFunctionTable;
 632   support::ulittle32_t GuardCFFunctionCount;
 633   support::ulittle32_t GuardFlags; // coff_guard_flags
 634
 635   // Added in MSVC 2017
 636   coff_load_config_code_integrity CodeIntegrity;
 637   support::ulittle32_t GuardAddressTakenIatEntryTable;
 638   support::ulittle32_t GuardAddressTakenIatEntryCount;
 639   support::ulittle32_t GuardLongJumpTargetTable;
 640   support::ulittle32_t GuardLongJumpTargetCount;
 641   support::ulittle32_t DynamicValueRelocTable;
 642   support::ulittle32_t CHPEMetadataPointer;
 643   support::ulittle32_t GuardRFFailureRoutine;
 644   support::ulittle32_t GuardRFFailureRoutineFunctionPointer;
 645   support::ulittle32_t DynamicValueRelocTableOffset;
 646   support::ulittle16_t DynamicValueRelocTableSection;
 647   support::ulittle16_t Reserved2;
 648   support::ulittle32_t GuardRFVerifyStackPointerFunctionPointer;
 649   support::ulittle32_t HotPatchTableOffset;
 650 };
 651
 652 /// 64-bit load config (IMAGE_LOAD_CONFIG_DIRECTORY64)
 653 struct coff_load_configuration64 {
 654   support::ulittle32_t Size;
 655   support::ulittle32_t TimeDateStamp;
 656   support::ulittle16_t MajorVersion;
 657   support::ulittle16_t MinorVersion;
 658   support::ulittle32_t GlobalFlagsClear;
 659   support::ulittle32_t GlobalFlagsSet;
 660   support::ulittle32_t CriticalSectionDefaultTimeout;
 661   support::ulittle64_t DeCommitFreeBlockThreshold;
 662   support::ulittle64_t DeCommitTotalFreeThreshold;
 663   support::ulittle64_t LockPrefixTable;
 664   support::ulittle64_t MaximumAllocationSize;
 665   support::ulittle64_t VirtualMemoryThreshold;
 666   support::ulittle64_t ProcessAffinityMask;
 667   support::ulittle32_t ProcessHeapFlags;
 668   support::ulittle16_t CSDVersion;
 669   support::ulittle16_t DependentLoadFlags;
 670   support::ulittle64_t EditList;
 671   support::ulittle64_t SecurityCookie;
 672   support::ulittle64_t SEHandlerTable;
 673   support::ulittle64_t SEHandlerCount;
 674
 675   // Added in MSVC 2015 for /guard:cf.
 676   support::ulittle64_t GuardCFCheckFunction;
 677   support::ulittle64_t GuardCFCheckDispatch;
 678   support::ulittle64_t GuardCFFunctionTable;
 679   support::ulittle64_t GuardCFFunctionCount;
 680   support::ulittle32_t GuardFlags;
 681
 682   // Added in MSVC 2017
 683   coff_load_config_code_integrity CodeIntegrity;
 684   support::ulittle64_t GuardAddressTakenIatEntryTable;
 685   support::ulittle64_t GuardAddressTakenIatEntryCount;
 686   support::ulittle64_t GuardLongJumpTargetTable;
 687   support::ulittle64_t GuardLongJumpTargetCount;
 688   support::ulittle64_t DynamicValueRelocTable;
 689   support::ulittle64_t CHPEMetadataPointer;
 690   support::ulittle64_t GuardRFFailureRoutine;
 691   support::ulittle64_t GuardRFFailureRoutineFunctionPointer;
 692   support::ulittle32_t DynamicValueRelocTableOffset;
 693   support::ulittle16_t DynamicValueRelocTableSection;
 694   support::ulittle16_t Reserved2;
 695   support::ulittle64_t GuardRFVerifyStackPointerFunctionPointer;
 696   support::ulittle32_t HotPatchTableOffset;
 697 };
 698
 699 struct coff_runtime_function_x64 {
 700   support::ulittle32_t BeginAddress;
 701   support::ulittle32_t EndAddress;
 702   support::ulittle32_t UnwindInformation;
 703 };
 704
 705 struct coff_base_reloc_block_header {
 706   support::ulittle32_t PageRVA;
 707   support::ulittle32_t BlockSize;
 708 };
 709
 710 struct coff_base_reloc_block_entry {
 711   support::ulittle16_t Data;
 712
 713   int getType() const { return Data >> 12; }
 714   int getOffset() const { return Data & ((1 << 12) - 1); }
 715 };
 716
 717 struct coff_resource_dir_entry {
 718   union {
 719     support::ulittle32_t NameOffset;
 720     support::ulittle32_t ID;
 721     uint32_t getNameOffset() const {
 722       return maskTrailingOnes<uint32_t>(31) & NameOffset;
 723     }
 724     // Even though the PE/COFF spec doesn't mention this, the high bit of a name
 725     // offset is set.
 726     void setNameOffset(uint32_t Offset) { NameOffset = Offset | (1 << 31); }
 727   } Identifier;
 728   union {
 729     support::ulittle32_t DataEntryOffset;
 730     support::ulittle32_t SubdirOffset;
 731
 732     bool isSubDir() const { return SubdirOffset >> 31; }
 733     uint32_t value() const {
 734       return maskTrailingOnes<uint32_t>(31) & SubdirOffset;
 735     }
 736
 737   } Offset;
 738 };
 739
 740 struct coff_resource_data_entry {
 741   support::ulittle32_t DataRVA;
 742   support::ulittle32_t DataSize;
 743   support::ulittle32_t Codepage;
 744   support::ulittle32_t Reserved;
 745 };
 746
 747 struct coff_resource_dir_table {
 748   support::ulittle32_t Characteristics;
 749   support::ulittle32_t TimeDateStamp;
 750   support::ulittle16_t MajorVersion;
 751   support::ulittle16_t MinorVersion;
 752   support::ulittle16_t NumberOfNameEntries;
 753   support::ulittle16_t NumberOfIDEntries;
 754 };
 755
 756 struct debug_h_header {
 757   support::ulittle32_t Magic;
 758   support::ulittle16_t Version;
 759   support::ulittle16_t HashAlgorithm;
 760 };
 761
 762 class COFFObjectFile : public ObjectFile {
 763 private:
 764   friend class ImportDirectoryEntryRef;
 765   friend class ExportDirectoryEntryRef;
 766   const coff_file_header *COFFHeader;
 767   const coff_bigobj_file_header *COFFBigObjHeader;
 768   const pe32_header *PE32Header;
 769   const pe32plus_header *PE32PlusHeader;
 770   const data_directory *DataDirectory;
 771   const coff_section *SectionTable;
 772   const coff_symbol16 *SymbolTable16;
 773   const coff_symbol32 *SymbolTable32;
 774   const char *StringTable;
 775   uint32_t StringTableSize;
 776   const coff_import_directory_table_entry *ImportDirectory;
 777   const delay_import_directory_table_entry *DelayImportDirectory;
 778   uint32_t NumberOfDelayImportDirectory;
 779   const export_directory_table_entry *ExportDirectory;
 780   const coff_base_reloc_block_header *BaseRelocHeader;
 781   const coff_base_reloc_block_header *BaseRelocEnd;
 782   const debug_directory *DebugDirectoryBegin;
 783   const debug_directory *DebugDirectoryEnd;
 784   // Either coff_load_configuration32 or coff_load_configuration64.
 785   const void *LoadConfig = nullptr;
 786
 787   std::error_code getString(uint32_t offset, StringRef &Res) const;
 788
 789   template <typename coff_symbol_type>
 790   const coff_symbol_type *toSymb(DataRefImpl Symb) const;
 791   const coff_section *toSec(DataRefImpl Sec) const;
 792   const coff_relocation *toRel(DataRefImpl Rel) const;
 793
 794   std::error_code initSymbolTablePtr();
 795   std::error_code initImportTablePtr();
 796   std::error_code initDelayImportTablePtr();
 797   std::error_code initExportTablePtr();
 798   std::error_code initBaseRelocPtr();
 799   std::error_code initDebugDirectoryPtr();
 800   std::error_code initLoadConfigPtr();
 801
 802 public:
 803   uintptr_t getSymbolTable() const {
 804     if (SymbolTable16)
 805       return reinterpret_cast<uintptr_t>(SymbolTable16);
 806     if (SymbolTable32)
 807       return reinterpret_cast<uintptr_t>(SymbolTable32);
 808     return uintptr_t(0);
 809   }
 810
 811   uint16_t getMachine() const {
 812     if (COFFHeader)
 813       return COFFHeader->Machine;
 814     if (COFFBigObjHeader)
 815       return COFFBigObjHeader->Machine;
 816     llvm_unreachable("no COFF header!");
 817   }
 818
 819   uint16_t getSizeOfOptionalHeader() const {
 820     if (COFFHeader)
 821       return COFFHeader->isImportLibrary() ? 0
 822                                            : COFFHeader->SizeOfOptionalHeader;
 823     // bigobj doesn't have this field.
 824     if (COFFBigObjHeader)
 825       return 0;
 826     llvm_unreachable("no COFF header!");
 827   }
 828
 829   uint16_t getCharacteristics() const {
 830     if (COFFHeader)
 831       return COFFHeader->isImportLibrary() ? 0 : COFFHeader->Characteristics;
 832     // bigobj doesn't have characteristics to speak of,
 833     // editbin will silently lie to you if you attempt to set any.
 834     if (COFFBigObjHeader)
 835       return 0;
 836     llvm_unreachable("no COFF header!");
 837   }
 838
 839   uint32_t getTimeDateStamp() const {
 840     if (COFFHeader)
 841       return COFFHeader->TimeDateStamp;
 842     if (COFFBigObjHeader)
 843       return COFFBigObjHeader->TimeDateStamp;
 844     llvm_unreachable("no COFF header!");
 845   }
 846
 847   uint32_t getNumberOfSections() const {
 848     if (COFFHeader)
 849       return COFFHeader->isImportLibrary() ? 0 : COFFHeader->NumberOfSections;
 850     if (COFFBigObjHeader)
 851       return COFFBigObjHeader->NumberOfSections;
 852     llvm_unreachable("no COFF header!");
 853   }
 854
 855   uint32_t getPointerToSymbolTable() const {
 856     if (COFFHeader)
 857       return COFFHeader->isImportLibrary() ? 0
 858                                            : COFFHeader->PointerToSymbolTable;
 859     if (COFFBigObjHeader)
 860       return COFFBigObjHeader->PointerToSymbolTable;
 861     llvm_unreachable("no COFF header!");
 862   }
 863
 864   uint32_t getRawNumberOfSymbols() const {
 865     if (COFFHeader)
 866       return COFFHeader->isImportLibrary() ? 0 : COFFHeader->NumberOfSymbols;
 867     if (COFFBigObjHeader)
 868       return COFFBigObjHeader->NumberOfSymbols;
 869     llvm_unreachable("no COFF header!");
 870   }
 871
 872   uint32_t getNumberOfSymbols() const {
 873     if (!SymbolTable16 && !SymbolTable32)
 874       return 0;
 875     return getRawNumberOfSymbols();
 876   }
 877
 878   const coff_load_configuration32 *getLoadConfig32() const {
 879     assert(!is64());
 880     return reinterpret_cast<const coff_load_configuration32 *>(LoadConfig);
 881   }
 882
 883   const coff_load_configuration64 *getLoadConfig64() const {
 884     assert(is64());
 885     return reinterpret_cast<const coff_load_configuration64 *>(LoadConfig);
 886   }
 887   StringRef getRelocationTypeName(uint16_t Type) const;
 888
 889 protected:
 890   void moveSymbolNext(DataRefImpl &Symb) const override;
 891   Expected<StringRef> getSymbolName(DataRefImpl Symb) const override;
 892   Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const override;
 893   uint32_t getSymbolAlignment(DataRefImpl Symb) const override;
 894   uint64_t getSymbolValueImpl(DataRefImpl Symb) const override;
 895   uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const override;
 896   uint32_t getSymbolFlags(DataRefImpl Symb) const override;
 897   Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const override;
 898   Expected<section_iterator> getSymbolSection(DataRefImpl Symb) const override;
 899   void moveSectionNext(DataRefImpl &Sec) const override;
 900   Expected<StringRef> getSectionName(DataRefImpl Sec) const override;
 901   uint64_t getSectionAddress(DataRefImpl Sec) const override;
 902   uint64_t getSectionIndex(DataRefImpl Sec) const override;
 903   uint64_t getSectionSize(DataRefImpl Sec) const override;
 904   Expected<ArrayRef<uint8_t>>
 905   getSectionContents(DataRefImpl Sec) const override;
 906   uint64_t getSectionAlignment(DataRefImpl Sec) const override;
 907   bool isSectionCompressed(DataRefImpl Sec) const override;
 908   bool isSectionText(DataRefImpl Sec) const override;
 909   bool isSectionData(DataRefImpl Sec) const override;
 910   bool isSectionBSS(DataRefImpl Sec) const override;
 911   bool isSectionVirtual(DataRefImpl Sec) const override;
 912   relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
 913   relocation_iterator section_rel_end(DataRefImpl Sec) const override;
 914
 915   void moveRelocationNext(DataRefImpl &Rel) const override;
 916   uint64_t getRelocationOffset(DataRefImpl Rel) const override;
 917   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
 918   uint64_t getRelocationType(DataRefImpl Rel) const override;
 919   void getRelocationTypeName(DataRefImpl Rel,
 920                              SmallVectorImpl<char> &Result) const override;
 921
 922 public:
 923   COFFObjectFile(MemoryBufferRef Object, std::error_code &EC);
 924
 925   basic_symbol_iterator symbol_begin() const override;
 926   basic_symbol_iterator symbol_end() const override;
 927   section_iterator section_begin() const override;
 928   section_iterator section_end() const override;
 929
 930   const coff_section *getCOFFSection(const SectionRef &Section) const;
 931   COFFSymbolRef getCOFFSymbol(const DataRefImpl &Ref) const;
 932   COFFSymbolRef getCOFFSymbol(const SymbolRef &Symbol) const;
 933   const coff_relocation *getCOFFRelocation(const RelocationRef &Reloc) const;
 934   unsigned getSectionID(SectionRef Sec) const;
 935   unsigned getSymbolSectionID(SymbolRef Sym) const;
 936
 937   uint8_t getBytesInAddress() const override;
 938   StringRef getFileFormatName() const override;
 939   Triple::ArchType getArch() const override;
 940   Expected<uint64_t> getStartAddress() const override;
 941   SubtargetFeatures getFeatures() const override { return SubtargetFeatures(); }
 942
 943   import_directory_iterator import_directory_begin() const;
 944   import_directory_iterator import_directory_end() const;
 945   delay_import_directory_iterator delay_import_directory_begin() const;
 946   delay_import_directory_iterator delay_import_directory_end() const;
 947   export_directory_iterator export_directory_begin() const;
 948   export_directory_iterator export_directory_end() const;
 949   base_reloc_iterator base_reloc_begin() const;
 950   base_reloc_iterator base_reloc_end() const;
 951   const debug_directory *debug_directory_begin() const {
 952     return DebugDirectoryBegin;
 953   }
 954   const debug_directory *debug_directory_end() const {
 955     return DebugDirectoryEnd;
 956   }
 957
 958   iterator_range<import_directory_iterator> import_directories() const;
 959   iterator_range<delay_import_directory_iterator>
 960       delay_import_directories() const;
 961   iterator_range<export_directory_iterator> export_directories() const;
 962   iterator_range<base_reloc_iterator> base_relocs() const;
 963   iterator_range<const debug_directory *> debug_directories() const {
 964     return make_range(debug_directory_begin(), debug_directory_end());
 965   }
 966
 967   const dos_header *getDOSHeader() const {
 968     if (!PE32Header && !PE32PlusHeader)
 969       return nullptr;
 970     return reinterpret_cast<const dos_header *>(base());
 971   }
 972
 973   const coff_file_header *getCOFFHeader() const { return COFFHeader; }
 974   const coff_bigobj_file_header *getCOFFBigObjHeader() const {
 975     return COFFBigObjHeader;
 976   }
 977   const pe32_header *getPE32Header() const { return PE32Header; }
 978   const pe32plus_header *getPE32PlusHeader() const { return PE32PlusHeader; }
 979
 980   std::error_code getDataDirectory(uint32_t index,
 981                                    const data_directory *&Res) const;
 982   std::error_code getSection(int32_t index, const coff_section *&Res) const;
 983   std::error_code getSection(StringRef SectionName,
 984                              const coff_section *&Res) const;
 985
 986   template <typename coff_symbol_type>
 987   std::error_code getSymbol(uint32_t Index,
 988                             const coff_symbol_type *&Res) const {
 989     if (Index >= getNumberOfSymbols())
 990       return object_error::parse_failed;
 991
 992     Res = reinterpret_cast<coff_symbol_type *>(getSymbolTable()) + Index;
 993     return std::error_code();
 994   }
 995   Expected<COFFSymbolRef> getSymbol(uint32_t index) const {
 996     if (SymbolTable16) {
 997       const coff_symbol16 *Symb = nullptr;
 998       if (std::error_code EC = getSymbol(index, Symb))
 999         return errorCodeToError(EC);
1000       return COFFSymbolRef(Symb);
1001     }
1002     if (SymbolTable32) {
1003       const coff_symbol32 *Symb = nullptr;
1004       if (std::error_code EC = getSymbol(index, Symb))
1005         return errorCodeToError(EC);
1006       return COFFSymbolRef(Symb);
1007     }
1008     return errorCodeToError(object_error::parse_failed);
1009   }
1010
1011   template <typename T>
1012   std::error_code getAuxSymbol(uint32_t index, const T *&Res) const {
1013     Expected<COFFSymbolRef> S = getSymbol(index);
1014     if (Error E = S.takeError())
1015       return errorToErrorCode(std::move(E));
1016     Res = reinterpret_cast<const T *>(S->getRawPtr());
1017     return std::error_code();
1018   }
1019
1020   std::error_code getSymbolName(COFFSymbolRef Symbol, StringRef &Res) const;
1021   std::error_code getSymbolName(const coff_symbol_generic *Symbol,
1022                                 StringRef &Res) const;
1023
1024   ArrayRef<uint8_t> getSymbolAuxData(COFFSymbolRef Symbol) const;
1025
1026   uint32_t getSymbolIndex(COFFSymbolRef Symbol) const;
1027
1028   size_t getSymbolTableEntrySize() const {
1029     if (COFFHeader)
1030       return sizeof(coff_symbol16);
1031     if (COFFBigObjHeader)
1032       return sizeof(coff_symbol32);
1033     llvm_unreachable("null symbol table pointer!");
1034   }
1035
1036   ArrayRef<coff_relocation> getRelocations(const coff_section *Sec) const;
1037
1038   Expected<StringRef> getSectionName(const coff_section *Sec) const;
1039   uint64_t getSectionSize(const coff_section *Sec) const;
1040   Error getSectionContents(const coff_section *Sec,
1041                            ArrayRef<uint8_t> &Res) const;
1042
1043   uint64_t getImageBase() const;
1044   std::error_code getVaPtr(uint64_t VA, uintptr_t &Res) const;
1045   std::error_code getRvaPtr(uint32_t Rva, uintptr_t &Res) const;
1046
1047   /// Given an RVA base and size, returns a valid array of bytes or an error
1048   /// code if the RVA and size is not contained completely within a valid
1049   /// section.
1050   std::error_code getRvaAndSizeAsBytes(uint32_t RVA, uint32_t Size,
1051                                        ArrayRef<uint8_t> &Contents) const;
1052
1053   std::error_code getHintName(uint32_t Rva, uint16_t &Hint,
1054                               StringRef &Name) const;
1055
1056   /// Get PDB information out of a codeview debug directory entry.
1057   std::error_code getDebugPDBInfo(const debug_directory *DebugDir,
1058                                   const codeview::DebugInfo *&Info,
1059                                   StringRef &PDBFileName) const;
1060
1061   /// Get PDB information from an executable. If the information is not present,
1062   /// Info will be set to nullptr and PDBFileName will be empty. An error is
1063   /// returned only on corrupt object files. Convenience accessor that can be
1064   /// used if the debug directory is not already handy.
1065   std::error_code getDebugPDBInfo(const codeview::DebugInfo *&Info,
1066                                   StringRef &PDBFileName) const;
1067
1068   bool isRelocatableObject() const override;
1069   bool is64() const { return PE32PlusHeader; }
1070
1071   StringRef mapDebugSectionName(StringRef Name) const override;
1072
1073   static bool classof(const Binary *v) { return v->isCOFF(); }
1074 };
1075
1076 // The iterator for the import directory table.
1077 class ImportDirectoryEntryRef {
1078 public:
1079   ImportDirectoryEntryRef() = default;
1080   ImportDirectoryEntryRef(const coff_import_directory_table_entry *Table,
1081                           uint32_t I, const COFFObjectFile *Owner)
1082       : ImportTable(Table), Index(I), OwningObject(Owner) {}
1083
1084   bool operator==(const ImportDirectoryEntryRef &Other) const;
1085   void moveNext();
1086
1087   imported_symbol_iterator imported_symbol_begin() const;
1088   imported_symbol_iterator imported_symbol_end() const;
1089   iterator_range<imported_symbol_iterator> imported_symbols() const;
1090
1091   imported_symbol_iterator lookup_table_begin() const;
1092   imported_symbol_iterator lookup_table_end() const;
1093   iterator_range<imported_symbol_iterator> lookup_table_symbols() const;
1094
1095   std::error_code getName(StringRef &Result) const;
1096   std::error_code getImportLookupTableRVA(uint32_t &Result) const;
1097   std::error_code getImportAddressTableRVA(uint32_t &Result) const;
1098
1099   std::error_code
1100   getImportTableEntry(const coff_import_directory_table_entry *&Result) const;
1101
1102 private:
1103   const coff_import_directory_table_entry *ImportTable;
1104   uint32_t Index;
1105   const COFFObjectFile *OwningObject = nullptr;
1106 };
1107
1108 class DelayImportDirectoryEntryRef {
1109 public:
1110   DelayImportDirectoryEntryRef() = default;
1111   DelayImportDirectoryEntryRef(const delay_import_directory_table_entry *T,
1112                                uint32_t I, const COFFObjectFile *Owner)
1113       : Table(T), Index(I), OwningObject(Owner) {}
1114
1115   bool operator==(const DelayImportDirectoryEntryRef &Other) const;
1116   void moveNext();
1117
1118   imported_symbol_iterator imported_symbol_begin() const;
1119   imported_symbol_iterator imported_symbol_end() const;
1120   iterator_range<imported_symbol_iterator> imported_symbols() const;
1121
1122   std::error_code getName(StringRef &Result) const;
1123   std::error_code getDelayImportTable(
1124       const delay_import_directory_table_entry *&Result) const;
1125   std::error_code getImportAddress(int AddrIndex, uint64_t &Result) const;
1126
1127 private:
1128   const delay_import_directory_table_entry *Table;
1129   uint32_t Index;
1130   const COFFObjectFile *OwningObject = nullptr;
1131 };
1132
1133 // The iterator for the export directory table entry.
1134 class ExportDirectoryEntryRef {
1135 public:
1136   ExportDirectoryEntryRef() = default;
1137   ExportDirectoryEntryRef(const export_directory_table_entry *Table, uint32_t I,
1138                           const COFFObjectFile *Owner)
1139       : ExportTable(Table), Index(I), OwningObject(Owner) {}
1140
1141   bool operator==(const ExportDirectoryEntryRef &Other) const;
1142   void moveNext();
1143
1144   std::error_code getDllName(StringRef &Result) const;
1145   std::error_code getOrdinalBase(uint32_t &Result) const;
1146   std::error_code getOrdinal(uint32_t &Result) const;
1147   std::error_code getExportRVA(uint32_t &Result) const;
1148   std::error_code getSymbolName(StringRef &Result) const;
1149
1150   std::error_code isForwarder(bool &Result) const;
1151   std::error_code getForwardTo(StringRef &Result) const;
1152
1153 private:
1154   const export_directory_table_entry *ExportTable;
1155   uint32_t Index;
1156   const COFFObjectFile *OwningObject = nullptr;
1157 };
1158
1159 class ImportedSymbolRef {
1160 public:
1161   ImportedSymbolRef() = default;
1162   ImportedSymbolRef(const import_lookup_table_entry32 *Entry, uint32_t I,
1163                     const COFFObjectFile *Owner)
1164       : Entry32(Entry), Entry64(nullptr), Index(I), OwningObject(Owner) {}
1165   ImportedSymbolRef(const import_lookup_table_entry64 *Entry, uint32_t I,
1166                     const COFFObjectFile *Owner)
1167       : Entry32(nullptr), Entry64(Entry), Index(I), OwningObject(Owner) {}
1168
1169   bool operator==(const ImportedSymbolRef &Other) const;
1170   void moveNext();
1171
1172   std::error_code getSymbolName(StringRef &Result) const;
1173   std::error_code isOrdinal(bool &Result) const;
1174   std::error_code getOrdinal(uint16_t &Result) const;
1175   std::error_code getHintNameRVA(uint32_t &Result) const;
1176
1177 private:
1178   const import_lookup_table_entry32 *Entry32;
1179   const import_lookup_table_entry64 *Entry64;
1180   uint32_t Index;
1181   const COFFObjectFile *OwningObject = nullptr;
1182 };
1183
1184 class BaseRelocRef {
1185 public:
1186   BaseRelocRef() = default;
1187   BaseRelocRef(const coff_base_reloc_block_header *Header,
1188                const COFFObjectFile *Owner)
1189       : Header(Header), Index(0) {}
1190
1191   bool operator==(const BaseRelocRef &Other) const;
1192   void moveNext();
1193
1194   std::error_code getType(uint8_t &Type) const;
1195   std::error_code getRVA(uint32_t &Result) const;
1196
1197 private:
1198   const coff_base_reloc_block_header *Header;
1199   uint32_t Index;
1200 };
1201
1202 class ResourceSectionRef {
1203 public:
1204   ResourceSectionRef() = default;
1205   explicit ResourceSectionRef(StringRef Ref) : BBS(Ref, support::little) {}
1206
1207   Expected<ArrayRef<UTF16>>
1208   getEntryNameString(const coff_resource_dir_entry &Entry);
1209   Expected<const coff_resource_dir_table &>
1210   getEntrySubDir(const coff_resource_dir_entry &Entry);
1211   Expected<const coff_resource_dir_table &> getBaseTable();
1212   Expected<const coff_resource_dir_entry &>
1213   getTableEntry(const coff_resource_dir_table &Table, uint32_t Index);
1214
1215 private:
1216   BinaryByteStream BBS;
1217
1218   Expected<const coff_resource_dir_table &> getTableAtOffset(uint32_t Offset);
1219   Expected<const coff_resource_dir_entry &>
1220   getTableEntryAtOffset(uint32_t Offset);
1221   Expected<ArrayRef<UTF16>> getDirStringAtOffset(uint32_t Offset);
1222 };
1223
1224 // Corresponds to `_FPO_DATA` structure in the PE/COFF spec.
1225 struct FpoData {
1226   support::ulittle32_t Offset; // ulOffStart: Offset 1st byte of function code
1227   support::ulittle32_t Size;   // cbProcSize: # bytes in function
1228   support::ulittle32_t NumLocals; // cdwLocals: # bytes in locals/4
1229   support::ulittle16_t NumParams; // cdwParams: # bytes in params/4
1230   support::ulittle16_t Attributes;
1231
1232   // cbProlog: # bytes in prolog
1233   int getPrologSize() const { return Attributes & 0xF; }
1234
1235   // cbRegs: # regs saved
1236   int getNumSavedRegs() const { return (Attributes >> 8) & 0x7; }
1237
1238   // fHasSEH: true if seh is func
1239   bool hasSEH() const { return (Attributes >> 9) & 1; }
1240
1241   // fUseBP: true if EBP has been allocated
1242   bool useBP() const { return (Attributes >> 10) & 1; }
1243
1244   // cbFrame: frame pointer
1245   frame_type getFP() const { return static_cast<frame_type>(Attributes >> 14); }
1246 };
1247
1248 } // end namespace object
1249
1250 } // end namespace llvm
1251
1252 #endif // LLVM_OBJECT_COFF_H