1 //===- WasmObjectFile.cpp - Wasm object file implementation ---------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/ADT/ArrayRef.h" 11 #include "llvm/ADT/DenseSet.h" 12 #include "llvm/ADT/STLExtras.h" 13 #include "llvm/ADT/StringRef.h" 14 #include "llvm/ADT/StringSet.h" 15 #include "llvm/ADT/Triple.h" 16 #include "llvm/BinaryFormat/Wasm.h" 17 #include "llvm/MC/SubtargetFeature.h" 18 #include "llvm/Object/Binary.h" 19 #include "llvm/Object/Error.h" 20 #include "llvm/Object/ObjectFile.h" 21 #include "llvm/Object/SymbolicFile.h" 22 #include "llvm/Object/Wasm.h" 23 #include "llvm/Support/Endian.h" 24 #include "llvm/Support/Error.h" 25 #include "llvm/Support/ErrorHandling.h" 26 #include "llvm/Support/LEB128.h" 27 #include <algorithm> 28 #include <cassert> 29 #include <cstdint> 30 #include <cstring> 31 #include <system_error> 32 33 #define DEBUG_TYPE "wasm-object" 34 35 using namespace llvm; 36 using namespace object; 37 38 void WasmSymbol::print(raw_ostream &Out) const { 39 Out << "Name=" << Info.Name 40 << ", Kind=" << toString(wasm::WasmSymbolType(Info.Kind)) 41 << ", Flags=" << Info.Flags; 42 if (!isTypeData()) { 43 Out << ", ElemIndex=" << Info.ElementIndex; 44 } else if (isDefined()) { 45 Out << ", Segment=" << Info.DataRef.Segment; 46 Out << ", Offset=" << Info.DataRef.Offset; 47 Out << ", Size=" << Info.DataRef.Size; 48 } 49 } 50 51 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 52 LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(dbgs()); } 53 #endif 54 55 Expected<std::unique_ptr<WasmObjectFile>> 56 ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) { 57 Error Err = Error::success(); 58 auto ObjectFile = llvm::make_unique<WasmObjectFile>(Buffer, Err); 59 if (Err) 60 return std::move(Err); 61 62 return std::move(ObjectFile); 63 } 64 65 #define VARINT7_MAX ((1<<7)-1) 66 #define VARINT7_MIN (-(1<<7)) 67 #define VARUINT7_MAX (1<<7) 68 #define VARUINT1_MAX (1) 69 70 static uint8_t readUint8(WasmObjectFile::ReadContext &Ctx) { 71 if (Ctx.Ptr == Ctx.End) 72 report_fatal_error("EOF while reading uint8"); 73 return *Ctx.Ptr++; 74 } 75 76 static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) { 77 if (Ctx.Ptr + 4 > Ctx.End) 78 report_fatal_error("EOF while reading uint32"); 79 uint32_t Result = support::endian::read32le(Ctx.Ptr); 80 Ctx.Ptr += 4; 81 return Result; 82 } 83 84 static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) { 85 int32_t Result = 0; 86 memcpy(&Result, Ctx.Ptr, sizeof(Result)); 87 Ctx.Ptr += sizeof(Result); 88 return Result; 89 } 90 91 static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) { 92 int64_t Result = 0; 93 memcpy(&Result, Ctx.Ptr, sizeof(Result)); 94 Ctx.Ptr += sizeof(Result); 95 return Result; 96 } 97 98 static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) { 99 unsigned Count; 100 const char* Error = nullptr; 101 uint64_t Result = decodeULEB128(Ctx.Ptr, &Count, Ctx.End, &Error); 102 if (Error) 103 report_fatal_error(Error); 104 Ctx.Ptr += Count; 105 return Result; 106 } 107 108 static StringRef readString(WasmObjectFile::ReadContext &Ctx) { 109 uint32_t StringLen = readULEB128(Ctx); 110 if (Ctx.Ptr + StringLen > Ctx.End) 111 report_fatal_error("EOF while reading string"); 112 StringRef Return = 113 StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen); 114 Ctx.Ptr += StringLen; 115 return Return; 116 } 117 118 static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) { 119 unsigned Count; 120 const char* Error = nullptr; 121 uint64_t Result = decodeSLEB128(Ctx.Ptr, &Count, Ctx.End, &Error); 122 if (Error) 123 report_fatal_error(Error); 124 Ctx.Ptr += Count; 125 return Result; 126 } 127 128 static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) { 129 int64_t result = readLEB128(Ctx); 130 if (result > VARUINT1_MAX || result < 0) 131 report_fatal_error("LEB is outside Varuint1 range"); 132 return result; 133 } 134 135 static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) { 136 int64_t result = readLEB128(Ctx); 137 if (result > INT32_MAX || result < INT32_MIN) 138 report_fatal_error("LEB is outside Varint32 range"); 139 return result; 140 } 141 142 static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) { 143 uint64_t result = readULEB128(Ctx); 144 if (result > UINT32_MAX) 145 report_fatal_error("LEB is outside Varuint32 range"); 146 return result; 147 } 148 149 static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) { 150 return readLEB128(Ctx); 151 } 152 153 static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) { 154 return readUint8(Ctx); 155 } 156 157 static Error readInitExpr(wasm::WasmInitExpr &Expr, 158 WasmObjectFile::ReadContext &Ctx) { 159 Expr.Opcode = readOpcode(Ctx); 160 161 switch (Expr.Opcode) { 162 case wasm::WASM_OPCODE_I32_CONST: 163 Expr.Value.Int32 = readVarint32(Ctx); 164 break; 165 case wasm::WASM_OPCODE_I64_CONST: 166 Expr.Value.Int64 = readVarint64(Ctx); 167 break; 168 case wasm::WASM_OPCODE_F32_CONST: 169 Expr.Value.Float32 = readFloat32(Ctx); 170 break; 171 case wasm::WASM_OPCODE_F64_CONST: 172 Expr.Value.Float64 = readFloat64(Ctx); 173 break; 174 case wasm::WASM_OPCODE_GET_GLOBAL: 175 Expr.Value.Global = readULEB128(Ctx); 176 break; 177 default: 178 return make_error<GenericBinaryError>("Invalid opcode in init_expr", 179 object_error::parse_failed); 180 } 181 182 uint8_t EndOpcode = readOpcode(Ctx); 183 if (EndOpcode != wasm::WASM_OPCODE_END) { 184 return make_error<GenericBinaryError>("Invalid init_expr", 185 object_error::parse_failed); 186 } 187 return Error::success(); 188 } 189 190 static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) { 191 wasm::WasmLimits Result; 192 Result.Flags = readVaruint1(Ctx); 193 Result.Initial = readVaruint32(Ctx); 194 if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) 195 Result.Maximum = readVaruint32(Ctx); 196 return Result; 197 } 198 199 static wasm::WasmTable readTable(WasmObjectFile::ReadContext &Ctx) { 200 wasm::WasmTable Table; 201 Table.ElemType = readUint8(Ctx); 202 Table.Limits = readLimits(Ctx); 203 return Table; 204 } 205 206 static Error readSection(WasmSection &Section, 207 WasmObjectFile::ReadContext &Ctx) { 208 Section.Offset = Ctx.Ptr - Ctx.Start; 209 Section.Type = readUint8(Ctx); 210 LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n"); 211 uint32_t Size = readVaruint32(Ctx); 212 if (Size == 0) 213 return make_error<StringError>("Zero length section", 214 object_error::parse_failed); 215 if (Ctx.Ptr + Size > Ctx.End) 216 return make_error<StringError>("Section too large", 217 object_error::parse_failed); 218 if (Section.Type == wasm::WASM_SEC_CUSTOM) { 219 const uint8_t *NameStart = Ctx.Ptr; 220 Section.Name = readString(Ctx); 221 Size -= Ctx.Ptr - NameStart; 222 } 223 Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 224 Ctx.Ptr += Size; 225 return Error::success(); 226 } 227 228 WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) 229 : ObjectFile(Binary::ID_Wasm, Buffer) { 230 ErrorAsOutParameter ErrAsOutParam(&Err); 231 Header.Magic = getData().substr(0, 4); 232 if (Header.Magic != StringRef("\0asm", 4)) { 233 Err = make_error<StringError>("Bad magic number", 234 object_error::parse_failed); 235 return; 236 } 237 238 ReadContext Ctx; 239 Ctx.Start = getPtr(0); 240 Ctx.Ptr = Ctx.Start + 4; 241 Ctx.End = Ctx.Start + getData().size(); 242 243 if (Ctx.Ptr + 4 > Ctx.End) { 244 Err = make_error<StringError>("Missing version number", 245 object_error::parse_failed); 246 return; 247 } 248 249 Header.Version = readUint32(Ctx); 250 if (Header.Version != wasm::WasmVersion) { 251 Err = make_error<StringError>("Bad version number", 252 object_error::parse_failed); 253 return; 254 } 255 256 WasmSection Sec; 257 while (Ctx.Ptr < Ctx.End) { 258 if ((Err = readSection(Sec, Ctx))) 259 return; 260 if ((Err = parseSection(Sec))) 261 return; 262 263 Sections.push_back(Sec); 264 } 265 } 266 267 Error WasmObjectFile::parseSection(WasmSection &Sec) { 268 ReadContext Ctx; 269 Ctx.Start = Sec.Content.data(); 270 Ctx.End = Ctx.Start + Sec.Content.size(); 271 Ctx.Ptr = Ctx.Start; 272 switch (Sec.Type) { 273 case wasm::WASM_SEC_CUSTOM: 274 return parseCustomSection(Sec, Ctx); 275 case wasm::WASM_SEC_TYPE: 276 return parseTypeSection(Ctx); 277 case wasm::WASM_SEC_IMPORT: 278 return parseImportSection(Ctx); 279 case wasm::WASM_SEC_FUNCTION: 280 return parseFunctionSection(Ctx); 281 case wasm::WASM_SEC_TABLE: 282 return parseTableSection(Ctx); 283 case wasm::WASM_SEC_MEMORY: 284 return parseMemorySection(Ctx); 285 case wasm::WASM_SEC_GLOBAL: 286 return parseGlobalSection(Ctx); 287 case wasm::WASM_SEC_EXPORT: 288 return parseExportSection(Ctx); 289 case wasm::WASM_SEC_START: 290 return parseStartSection(Ctx); 291 case wasm::WASM_SEC_ELEM: 292 return parseElemSection(Ctx); 293 case wasm::WASM_SEC_CODE: 294 return parseCodeSection(Ctx); 295 case wasm::WASM_SEC_DATA: 296 return parseDataSection(Ctx); 297 default: 298 return make_error<GenericBinaryError>("Bad section type", 299 object_error::parse_failed); 300 } 301 } 302 303 Error WasmObjectFile::parseNameSection(ReadContext &Ctx) { 304 llvm::DenseSet<uint64_t> Seen; 305 if (Functions.size() != FunctionTypes.size()) { 306 return make_error<GenericBinaryError>("Names must come after code section", 307 object_error::parse_failed); 308 } 309 310 while (Ctx.Ptr < Ctx.End) { 311 uint8_t Type = readUint8(Ctx); 312 uint32_t Size = readVaruint32(Ctx); 313 const uint8_t *SubSectionEnd = Ctx.Ptr + Size; 314 switch (Type) { 315 case wasm::WASM_NAMES_FUNCTION: { 316 uint32_t Count = readVaruint32(Ctx); 317 while (Count--) { 318 uint32_t Index = readVaruint32(Ctx); 319 if (!Seen.insert(Index).second) 320 return make_error<GenericBinaryError>("Function named more than once", 321 object_error::parse_failed); 322 StringRef Name = readString(Ctx); 323 if (!isValidFunctionIndex(Index) || Name.empty()) 324 return make_error<GenericBinaryError>("Invalid name entry", 325 object_error::parse_failed); 326 DebugNames.push_back(wasm::WasmFunctionName{Index, Name}); 327 if (isDefinedFunctionIndex(Index)) 328 getDefinedFunction(Index).DebugName = Name; 329 } 330 break; 331 } 332 // Ignore local names for now 333 case wasm::WASM_NAMES_LOCAL: 334 default: 335 Ctx.Ptr += Size; 336 break; 337 } 338 if (Ctx.Ptr != SubSectionEnd) 339 return make_error<GenericBinaryError>("Name sub-section ended prematurely", 340 object_error::parse_failed); 341 } 342 343 if (Ctx.Ptr != Ctx.End) 344 return make_error<GenericBinaryError>("Name section ended prematurely", 345 object_error::parse_failed); 346 return Error::success(); 347 } 348 349 Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) { 350 HasLinkingSection = true; 351 if (Functions.size() != FunctionTypes.size()) { 352 return make_error<GenericBinaryError>( 353 "Linking data must come after code section", object_error::parse_failed); 354 } 355 356 LinkingData.Version = readVaruint32(Ctx); 357 if (LinkingData.Version != wasm::WasmMetadataVersion) { 358 return make_error<GenericBinaryError>( 359 "Unexpected metadata version: " + Twine(LinkingData.Version) + 360 " (Expected: " + Twine(wasm::WasmMetadataVersion) + ")", 361 object_error::parse_failed); 362 } 363 364 const uint8_t *OrigEnd = Ctx.End; 365 while (Ctx.Ptr < OrigEnd) { 366 Ctx.End = OrigEnd; 367 uint8_t Type = readUint8(Ctx); 368 uint32_t Size = readVaruint32(Ctx); 369 LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size 370 << "\n"); 371 Ctx.End = Ctx.Ptr + Size; 372 switch (Type) { 373 case wasm::WASM_SYMBOL_TABLE: 374 if (Error Err = parseLinkingSectionSymtab(Ctx)) 375 return Err; 376 break; 377 case wasm::WASM_SEGMENT_INFO: { 378 uint32_t Count = readVaruint32(Ctx); 379 if (Count > DataSegments.size()) 380 return make_error<GenericBinaryError>("Too many segment names", 381 object_error::parse_failed); 382 for (uint32_t i = 0; i < Count; i++) { 383 DataSegments[i].Data.Name = readString(Ctx); 384 DataSegments[i].Data.Alignment = readVaruint32(Ctx); 385 DataSegments[i].Data.Flags = readVaruint32(Ctx); 386 } 387 break; 388 } 389 case wasm::WASM_INIT_FUNCS: { 390 uint32_t Count = readVaruint32(Ctx); 391 LinkingData.InitFunctions.reserve(Count); 392 for (uint32_t i = 0; i < Count; i++) { 393 wasm::WasmInitFunc Init; 394 Init.Priority = readVaruint32(Ctx); 395 Init.Symbol = readVaruint32(Ctx); 396 if (!isValidFunctionSymbol(Init.Symbol)) 397 return make_error<GenericBinaryError>("Invalid function symbol: " + 398 Twine(Init.Symbol), 399 object_error::parse_failed); 400 LinkingData.InitFunctions.emplace_back(Init); 401 } 402 break; 403 } 404 case wasm::WASM_COMDAT_INFO: 405 if (Error Err = parseLinkingSectionComdat(Ctx)) 406 return Err; 407 break; 408 default: 409 Ctx.Ptr += Size; 410 break; 411 } 412 if (Ctx.Ptr != Ctx.End) 413 return make_error<GenericBinaryError>( 414 "Linking sub-section ended prematurely", object_error::parse_failed); 415 } 416 if (Ctx.Ptr != OrigEnd) 417 return make_error<GenericBinaryError>("Linking section ended prematurely", 418 object_error::parse_failed); 419 return Error::success(); 420 } 421 422 Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) { 423 uint32_t Count = readVaruint32(Ctx); 424 LinkingData.SymbolTable.reserve(Count); 425 Symbols.reserve(Count); 426 StringSet<> SymbolNames; 427 428 std::vector<wasm::WasmImport *> ImportedGlobals; 429 std::vector<wasm::WasmImport *> ImportedFunctions; 430 ImportedGlobals.reserve(Imports.size()); 431 ImportedFunctions.reserve(Imports.size()); 432 for (auto &I : Imports) { 433 if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION) 434 ImportedFunctions.emplace_back(&I); 435 else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL) 436 ImportedGlobals.emplace_back(&I); 437 } 438 439 while (Count--) { 440 wasm::WasmSymbolInfo Info; 441 const wasm::WasmSignature *FunctionType = nullptr; 442 const wasm::WasmGlobalType *GlobalType = nullptr; 443 444 Info.Kind = readUint8(Ctx); 445 Info.Flags = readVaruint32(Ctx); 446 bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0; 447 448 switch (Info.Kind) { 449 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 450 Info.ElementIndex = readVaruint32(Ctx); 451 if (!isValidFunctionIndex(Info.ElementIndex) || 452 IsDefined != isDefinedFunctionIndex(Info.ElementIndex)) 453 return make_error<GenericBinaryError>("invalid function symbol index", 454 object_error::parse_failed); 455 if (IsDefined) { 456 Info.Name = readString(Ctx); 457 unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; 458 FunctionType = &Signatures[FunctionTypes[FuncIndex]]; 459 wasm::WasmFunction &Function = Functions[FuncIndex]; 460 if (Function.SymbolName.empty()) 461 Function.SymbolName = Info.Name; 462 } else { 463 wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex]; 464 FunctionType = &Signatures[Import.SigIndex]; 465 Info.Name = Import.Field; 466 Info.Module = Import.Module; 467 } 468 break; 469 470 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 471 Info.ElementIndex = readVaruint32(Ctx); 472 if (!isValidGlobalIndex(Info.ElementIndex) || 473 IsDefined != isDefinedGlobalIndex(Info.ElementIndex)) 474 return make_error<GenericBinaryError>("invalid global symbol index", 475 object_error::parse_failed); 476 if (!IsDefined && 477 (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 478 wasm::WASM_SYMBOL_BINDING_WEAK) 479 return make_error<GenericBinaryError>("undefined weak global symbol", 480 object_error::parse_failed); 481 if (IsDefined) { 482 Info.Name = readString(Ctx); 483 unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals; 484 wasm::WasmGlobal &Global = Globals[GlobalIndex]; 485 GlobalType = &Global.Type; 486 if (Global.SymbolName.empty()) 487 Global.SymbolName = Info.Name; 488 } else { 489 wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex]; 490 Info.Name = Import.Field; 491 GlobalType = &Import.Global; 492 } 493 break; 494 495 case wasm::WASM_SYMBOL_TYPE_DATA: 496 Info.Name = readString(Ctx); 497 if (IsDefined) { 498 uint32_t Index = readVaruint32(Ctx); 499 if (Index >= DataSegments.size()) 500 return make_error<GenericBinaryError>("invalid data symbol index", 501 object_error::parse_failed); 502 uint32_t Offset = readVaruint32(Ctx); 503 uint32_t Size = readVaruint32(Ctx); 504 if (Offset + Size > DataSegments[Index].Data.Content.size()) 505 return make_error<GenericBinaryError>("invalid data symbol offset", 506 object_error::parse_failed); 507 Info.DataRef = wasm::WasmDataReference{Index, Offset, Size}; 508 } 509 break; 510 511 case wasm::WASM_SYMBOL_TYPE_SECTION: { 512 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 513 wasm::WASM_SYMBOL_BINDING_LOCAL) 514 return make_error<GenericBinaryError>( 515 "Section symbols must have local binding", 516 object_error::parse_failed); 517 Info.ElementIndex = readVaruint32(Ctx); 518 // Use somewhat unique section name as symbol name. 519 StringRef SectionName = Sections[Info.ElementIndex].Name; 520 Info.Name = SectionName; 521 break; 522 } 523 524 default: 525 return make_error<GenericBinaryError>("Invalid symbol type", 526 object_error::parse_failed); 527 } 528 529 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 530 wasm::WASM_SYMBOL_BINDING_LOCAL && 531 !SymbolNames.insert(Info.Name).second) 532 return make_error<GenericBinaryError>("Duplicate symbol name " + 533 Twine(Info.Name), 534 object_error::parse_failed); 535 LinkingData.SymbolTable.emplace_back(Info); 536 Symbols.emplace_back(LinkingData.SymbolTable.back(), FunctionType, 537 GlobalType); 538 LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n"); 539 } 540 541 return Error::success(); 542 } 543 544 Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { 545 uint32_t ComdatCount = readVaruint32(Ctx); 546 StringSet<> ComdatSet; 547 for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { 548 StringRef Name = readString(Ctx); 549 if (Name.empty() || !ComdatSet.insert(Name).second) 550 return make_error<GenericBinaryError>("Bad/duplicate COMDAT name " + Twine(Name), 551 object_error::parse_failed); 552 LinkingData.Comdats.emplace_back(Name); 553 uint32_t Flags = readVaruint32(Ctx); 554 if (Flags != 0) 555 return make_error<GenericBinaryError>("Unsupported COMDAT flags", 556 object_error::parse_failed); 557 558 uint32_t EntryCount = readVaruint32(Ctx); 559 while (EntryCount--) { 560 unsigned Kind = readVaruint32(Ctx); 561 unsigned Index = readVaruint32(Ctx); 562 switch (Kind) { 563 default: 564 return make_error<GenericBinaryError>("Invalid COMDAT entry type", 565 object_error::parse_failed); 566 case wasm::WASM_COMDAT_DATA: 567 if (Index >= DataSegments.size()) 568 return make_error<GenericBinaryError>("COMDAT data index out of range", 569 object_error::parse_failed); 570 if (DataSegments[Index].Data.Comdat != UINT32_MAX) 571 return make_error<GenericBinaryError>("Data segment in two COMDATs", 572 object_error::parse_failed); 573 DataSegments[Index].Data.Comdat = ComdatIndex; 574 break; 575 case wasm::WASM_COMDAT_FUNCTION: 576 if (!isDefinedFunctionIndex(Index)) 577 return make_error<GenericBinaryError>("COMDAT function index out of range", 578 object_error::parse_failed); 579 if (getDefinedFunction(Index).Comdat != UINT32_MAX) 580 return make_error<GenericBinaryError>("Function in two COMDATs", 581 object_error::parse_failed); 582 getDefinedFunction(Index).Comdat = ComdatIndex; 583 break; 584 } 585 } 586 } 587 return Error::success(); 588 } 589 590 Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { 591 uint32_t SectionIndex = readVaruint32(Ctx); 592 if (SectionIndex >= Sections.size()) 593 return make_error<GenericBinaryError>("Invalid section index", 594 object_error::parse_failed); 595 WasmSection& Section = Sections[SectionIndex]; 596 uint32_t RelocCount = readVaruint32(Ctx); 597 uint32_t EndOffset = Section.Content.size(); 598 while (RelocCount--) { 599 wasm::WasmRelocation Reloc = {}; 600 Reloc.Type = readVaruint32(Ctx); 601 Reloc.Offset = readVaruint32(Ctx); 602 Reloc.Index = readVaruint32(Ctx); 603 switch (Reloc.Type) { 604 case wasm::R_WEBASSEMBLY_FUNCTION_INDEX_LEB: 605 case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB: 606 case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32: 607 if (!isValidFunctionSymbol(Reloc.Index)) 608 return make_error<GenericBinaryError>("Bad relocation function index", 609 object_error::parse_failed); 610 break; 611 case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB: 612 if (Reloc.Index >= Signatures.size()) 613 return make_error<GenericBinaryError>("Bad relocation type index", 614 object_error::parse_failed); 615 break; 616 case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB: 617 if (!isValidGlobalSymbol(Reloc.Index)) 618 return make_error<GenericBinaryError>("Bad relocation global index", 619 object_error::parse_failed); 620 break; 621 case wasm::R_WEBASSEMBLY_MEMORY_ADDR_LEB: 622 case wasm::R_WEBASSEMBLY_MEMORY_ADDR_SLEB: 623 case wasm::R_WEBASSEMBLY_MEMORY_ADDR_I32: 624 if (!isValidDataSymbol(Reloc.Index)) 625 return make_error<GenericBinaryError>("Bad relocation data index", 626 object_error::parse_failed); 627 Reloc.Addend = readVarint32(Ctx); 628 break; 629 case wasm::R_WEBASSEMBLY_FUNCTION_OFFSET_I32: 630 if (!isValidFunctionSymbol(Reloc.Index)) 631 return make_error<GenericBinaryError>("Bad relocation function index", 632 object_error::parse_failed); 633 Reloc.Addend = readVarint32(Ctx); 634 break; 635 case wasm::R_WEBASSEMBLY_SECTION_OFFSET_I32: 636 if (!isValidSectionSymbol(Reloc.Index)) 637 return make_error<GenericBinaryError>("Bad relocation section index", 638 object_error::parse_failed); 639 Reloc.Addend = readVarint32(Ctx); 640 break; 641 default: 642 return make_error<GenericBinaryError>("Bad relocation type: " + 643 Twine(Reloc.Type), 644 object_error::parse_failed); 645 } 646 647 // Relocations must fit inside the section, and must appear in order. They 648 // also shouldn't overlap a function/element boundary, but we don't bother 649 // to check that. 650 uint64_t Size = 5; 651 if (Reloc.Type == wasm::R_WEBASSEMBLY_TABLE_INDEX_I32 || 652 Reloc.Type == wasm::R_WEBASSEMBLY_MEMORY_ADDR_I32 || 653 Reloc.Type == wasm::R_WEBASSEMBLY_SECTION_OFFSET_I32 || 654 Reloc.Type == wasm::R_WEBASSEMBLY_FUNCTION_OFFSET_I32) 655 Size = 4; 656 if (Reloc.Offset + Size > EndOffset) 657 return make_error<GenericBinaryError>("Bad relocation offset", 658 object_error::parse_failed); 659 660 Section.Relocations.push_back(Reloc); 661 } 662 if (Ctx.Ptr != Ctx.End) 663 return make_error<GenericBinaryError>("Reloc section ended prematurely", 664 object_error::parse_failed); 665 return Error::success(); 666 } 667 668 Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { 669 if (Sec.Name == "name") { 670 if (Error Err = parseNameSection(Ctx)) 671 return Err; 672 } else if (Sec.Name == "linking") { 673 if (Error Err = parseLinkingSection(Ctx)) 674 return Err; 675 } else if (Sec.Name.startswith("reloc.")) { 676 if (Error Err = parseRelocSection(Sec.Name, Ctx)) 677 return Err; 678 } 679 return Error::success(); 680 } 681 682 Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { 683 uint32_t Count = readVaruint32(Ctx); 684 Signatures.reserve(Count); 685 while (Count--) { 686 wasm::WasmSignature Sig; 687 Sig.ReturnType = wasm::WASM_TYPE_NORESULT; 688 uint8_t Form = readUint8(Ctx); 689 if (Form != wasm::WASM_TYPE_FUNC) { 690 return make_error<GenericBinaryError>("Invalid signature type", 691 object_error::parse_failed); 692 } 693 uint32_t ParamCount = readVaruint32(Ctx); 694 Sig.ParamTypes.reserve(ParamCount); 695 while (ParamCount--) { 696 uint32_t ParamType = readUint8(Ctx); 697 Sig.ParamTypes.push_back(ParamType); 698 } 699 uint32_t ReturnCount = readVaruint32(Ctx); 700 if (ReturnCount) { 701 if (ReturnCount != 1) { 702 return make_error<GenericBinaryError>( 703 "Multiple return types not supported", object_error::parse_failed); 704 } 705 Sig.ReturnType = readUint8(Ctx); 706 } 707 Signatures.push_back(Sig); 708 } 709 if (Ctx.Ptr != Ctx.End) 710 return make_error<GenericBinaryError>("Type section ended prematurely", 711 object_error::parse_failed); 712 return Error::success(); 713 } 714 715 Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { 716 uint32_t Count = readVaruint32(Ctx); 717 Imports.reserve(Count); 718 for (uint32_t i = 0; i < Count; i++) { 719 wasm::WasmImport Im; 720 Im.Module = readString(Ctx); 721 Im.Field = readString(Ctx); 722 Im.Kind = readUint8(Ctx); 723 switch (Im.Kind) { 724 case wasm::WASM_EXTERNAL_FUNCTION: 725 NumImportedFunctions++; 726 Im.SigIndex = readVaruint32(Ctx); 727 break; 728 case wasm::WASM_EXTERNAL_GLOBAL: 729 NumImportedGlobals++; 730 Im.Global.Type = readUint8(Ctx); 731 Im.Global.Mutable = readVaruint1(Ctx); 732 break; 733 case wasm::WASM_EXTERNAL_MEMORY: 734 Im.Memory = readLimits(Ctx); 735 break; 736 case wasm::WASM_EXTERNAL_TABLE: 737 Im.Table = readTable(Ctx); 738 if (Im.Table.ElemType != wasm::WASM_TYPE_ANYFUNC) 739 return make_error<GenericBinaryError>("Invalid table element type", 740 object_error::parse_failed); 741 break; 742 default: 743 return make_error<GenericBinaryError>( 744 "Unexpected import kind", object_error::parse_failed); 745 } 746 Imports.push_back(Im); 747 } 748 if (Ctx.Ptr != Ctx.End) 749 return make_error<GenericBinaryError>("Import section ended prematurely", 750 object_error::parse_failed); 751 return Error::success(); 752 } 753 754 Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { 755 uint32_t Count = readVaruint32(Ctx); 756 FunctionTypes.reserve(Count); 757 uint32_t NumTypes = Signatures.size(); 758 while (Count--) { 759 uint32_t Type = readVaruint32(Ctx); 760 if (Type >= NumTypes) 761 return make_error<GenericBinaryError>("Invalid function type", 762 object_error::parse_failed); 763 FunctionTypes.push_back(Type); 764 } 765 if (Ctx.Ptr != Ctx.End) 766 return make_error<GenericBinaryError>("Function section ended prematurely", 767 object_error::parse_failed); 768 return Error::success(); 769 } 770 771 Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { 772 uint32_t Count = readVaruint32(Ctx); 773 Tables.reserve(Count); 774 while (Count--) { 775 Tables.push_back(readTable(Ctx)); 776 if (Tables.back().ElemType != wasm::WASM_TYPE_ANYFUNC) { 777 return make_error<GenericBinaryError>("Invalid table element type", 778 object_error::parse_failed); 779 } 780 } 781 if (Ctx.Ptr != Ctx.End) 782 return make_error<GenericBinaryError>("Table section ended prematurely", 783 object_error::parse_failed); 784 return Error::success(); 785 } 786 787 Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { 788 uint32_t Count = readVaruint32(Ctx); 789 Memories.reserve(Count); 790 while (Count--) { 791 Memories.push_back(readLimits(Ctx)); 792 } 793 if (Ctx.Ptr != Ctx.End) 794 return make_error<GenericBinaryError>("Memory section ended prematurely", 795 object_error::parse_failed); 796 return Error::success(); 797 } 798 799 Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { 800 GlobalSection = Sections.size(); 801 uint32_t Count = readVaruint32(Ctx); 802 Globals.reserve(Count); 803 while (Count--) { 804 wasm::WasmGlobal Global; 805 Global.Index = NumImportedGlobals + Globals.size(); 806 Global.Type.Type = readUint8(Ctx); 807 Global.Type.Mutable = readVaruint1(Ctx); 808 if (Error Err = readInitExpr(Global.InitExpr, Ctx)) 809 return Err; 810 Globals.push_back(Global); 811 } 812 if (Ctx.Ptr != Ctx.End) 813 return make_error<GenericBinaryError>("Global section ended prematurely", 814 object_error::parse_failed); 815 return Error::success(); 816 } 817 818 Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { 819 uint32_t Count = readVaruint32(Ctx); 820 Exports.reserve(Count); 821 for (uint32_t i = 0; i < Count; i++) { 822 wasm::WasmExport Ex; 823 Ex.Name = readString(Ctx); 824 Ex.Kind = readUint8(Ctx); 825 Ex.Index = readVaruint32(Ctx); 826 switch (Ex.Kind) { 827 case wasm::WASM_EXTERNAL_FUNCTION: 828 if (!isValidFunctionIndex(Ex.Index)) 829 return make_error<GenericBinaryError>("Invalid function export", 830 object_error::parse_failed); 831 break; 832 case wasm::WASM_EXTERNAL_GLOBAL: 833 if (!isValidGlobalIndex(Ex.Index)) 834 return make_error<GenericBinaryError>("Invalid global export", 835 object_error::parse_failed); 836 break; 837 case wasm::WASM_EXTERNAL_MEMORY: 838 case wasm::WASM_EXTERNAL_TABLE: 839 break; 840 default: 841 return make_error<GenericBinaryError>( 842 "Unexpected export kind", object_error::parse_failed); 843 } 844 Exports.push_back(Ex); 845 } 846 if (Ctx.Ptr != Ctx.End) 847 return make_error<GenericBinaryError>("Export section ended prematurely", 848 object_error::parse_failed); 849 return Error::success(); 850 } 851 852 bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { 853 return Index < NumImportedFunctions + FunctionTypes.size(); 854 } 855 856 bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { 857 return Index >= NumImportedFunctions && isValidFunctionIndex(Index); 858 } 859 860 bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { 861 return Index < NumImportedGlobals + Globals.size(); 862 } 863 864 bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { 865 return Index >= NumImportedGlobals && isValidGlobalIndex(Index); 866 } 867 868 bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { 869 return Index < Symbols.size() && Symbols[Index].isTypeFunction(); 870 } 871 872 bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { 873 return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); 874 } 875 876 bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { 877 return Index < Symbols.size() && Symbols[Index].isTypeData(); 878 } 879 880 bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { 881 return Index < Symbols.size() && Symbols[Index].isTypeSection(); 882 } 883 884 wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { 885 assert(isDefinedFunctionIndex(Index)); 886 return Functions[Index - NumImportedFunctions]; 887 } 888 889 wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) { 890 assert(isDefinedGlobalIndex(Index)); 891 return Globals[Index - NumImportedGlobals]; 892 } 893 894 Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { 895 StartFunction = readVaruint32(Ctx); 896 if (!isValidFunctionIndex(StartFunction)) 897 return make_error<GenericBinaryError>("Invalid start function", 898 object_error::parse_failed); 899 return Error::success(); 900 } 901 902 Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { 903 CodeSection = Sections.size(); 904 uint32_t FunctionCount = readVaruint32(Ctx); 905 if (FunctionCount != FunctionTypes.size()) { 906 return make_error<GenericBinaryError>("Invalid function count", 907 object_error::parse_failed); 908 } 909 910 while (FunctionCount--) { 911 wasm::WasmFunction Function; 912 const uint8_t *FunctionStart = Ctx.Ptr; 913 uint32_t Size = readVaruint32(Ctx); 914 const uint8_t *FunctionEnd = Ctx.Ptr + Size; 915 916 Function.CodeOffset = Ctx.Ptr - FunctionStart; 917 Function.Index = NumImportedFunctions + Functions.size(); 918 Function.CodeSectionOffset = FunctionStart - Ctx.Start; 919 Function.Size = FunctionEnd - FunctionStart; 920 921 uint32_t NumLocalDecls = readVaruint32(Ctx); 922 Function.Locals.reserve(NumLocalDecls); 923 while (NumLocalDecls--) { 924 wasm::WasmLocalDecl Decl; 925 Decl.Count = readVaruint32(Ctx); 926 Decl.Type = readUint8(Ctx); 927 Function.Locals.push_back(Decl); 928 } 929 930 uint32_t BodySize = FunctionEnd - Ctx.Ptr; 931 Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); 932 // This will be set later when reading in the linking metadata section. 933 Function.Comdat = UINT32_MAX; 934 Ctx.Ptr += BodySize; 935 assert(Ctx.Ptr == FunctionEnd); 936 Functions.push_back(Function); 937 } 938 if (Ctx.Ptr != Ctx.End) 939 return make_error<GenericBinaryError>("Code section ended prematurely", 940 object_error::parse_failed); 941 return Error::success(); 942 } 943 944 Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { 945 uint32_t Count = readVaruint32(Ctx); 946 ElemSegments.reserve(Count); 947 while (Count--) { 948 wasm::WasmElemSegment Segment; 949 Segment.TableIndex = readVaruint32(Ctx); 950 if (Segment.TableIndex != 0) { 951 return make_error<GenericBinaryError>("Invalid TableIndex", 952 object_error::parse_failed); 953 } 954 if (Error Err = readInitExpr(Segment.Offset, Ctx)) 955 return Err; 956 uint32_t NumElems = readVaruint32(Ctx); 957 while (NumElems--) { 958 Segment.Functions.push_back(readVaruint32(Ctx)); 959 } 960 ElemSegments.push_back(Segment); 961 } 962 if (Ctx.Ptr != Ctx.End) 963 return make_error<GenericBinaryError>("Elem section ended prematurely", 964 object_error::parse_failed); 965 return Error::success(); 966 } 967 968 Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { 969 DataSection = Sections.size(); 970 uint32_t Count = readVaruint32(Ctx); 971 DataSegments.reserve(Count); 972 while (Count--) { 973 WasmSegment Segment; 974 Segment.Data.MemoryIndex = readVaruint32(Ctx); 975 if (Error Err = readInitExpr(Segment.Data.Offset, Ctx)) 976 return Err; 977 uint32_t Size = readVaruint32(Ctx); 978 if (Size > (size_t)(Ctx.End - Ctx.Ptr)) 979 return make_error<GenericBinaryError>("Invalid segment size", 980 object_error::parse_failed); 981 Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 982 // The rest of these Data fields are set later, when reading in the linking 983 // metadata section. 984 Segment.Data.Alignment = 0; 985 Segment.Data.Flags = 0; 986 Segment.Data.Comdat = UINT32_MAX; 987 Segment.SectionOffset = Ctx.Ptr - Ctx.Start; 988 Ctx.Ptr += Size; 989 DataSegments.push_back(Segment); 990 } 991 if (Ctx.Ptr != Ctx.End) 992 return make_error<GenericBinaryError>("Data section ended prematurely", 993 object_error::parse_failed); 994 return Error::success(); 995 } 996 997 const uint8_t *WasmObjectFile::getPtr(size_t Offset) const { 998 return reinterpret_cast<const uint8_t *>(getData().data() + Offset); 999 } 1000 1001 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { 1002 return Header; 1003 } 1004 1005 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.a++; } 1006 1007 uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { 1008 uint32_t Result = SymbolRef::SF_None; 1009 const WasmSymbol &Sym = getWasmSymbol(Symb); 1010 1011 LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); 1012 if (Sym.isBindingWeak()) 1013 Result |= SymbolRef::SF_Weak; 1014 if (!Sym.isBindingLocal()) 1015 Result |= SymbolRef::SF_Global; 1016 if (Sym.isHidden()) 1017 Result |= SymbolRef::SF_Hidden; 1018 if (!Sym.isDefined()) 1019 Result |= SymbolRef::SF_Undefined; 1020 if (Sym.isTypeFunction()) 1021 Result |= SymbolRef::SF_Executable; 1022 return Result; 1023 } 1024 1025 basic_symbol_iterator WasmObjectFile::symbol_begin() const { 1026 DataRefImpl Ref; 1027 Ref.d.a = 0; 1028 return BasicSymbolRef(Ref, this); 1029 } 1030 1031 basic_symbol_iterator WasmObjectFile::symbol_end() const { 1032 DataRefImpl Ref; 1033 Ref.d.a = Symbols.size(); 1034 return BasicSymbolRef(Ref, this); 1035 } 1036 1037 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { 1038 return Symbols[Symb.d.a]; 1039 } 1040 1041 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { 1042 return getWasmSymbol(Symb.getRawDataRefImpl()); 1043 } 1044 1045 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { 1046 return getWasmSymbol(Symb).Info.Name; 1047 } 1048 1049 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { 1050 return getSymbolValue(Symb); 1051 } 1052 1053 uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol& Sym) const { 1054 switch (Sym.Info.Kind) { 1055 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1056 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1057 return Sym.Info.ElementIndex; 1058 case wasm::WASM_SYMBOL_TYPE_DATA: { 1059 // The value of a data symbol is the segment offset, plus the symbol 1060 // offset within the segment. 1061 uint32_t SegmentIndex = Sym.Info.DataRef.Segment; 1062 const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; 1063 assert(Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST); 1064 return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset; 1065 } 1066 case wasm::WASM_SYMBOL_TYPE_SECTION: 1067 return 0; 1068 } 1069 llvm_unreachable("invalid symbol type"); 1070 } 1071 1072 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { 1073 return getWasmSymbolValue(getWasmSymbol(Symb)); 1074 } 1075 1076 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { 1077 llvm_unreachable("not yet implemented"); 1078 return 0; 1079 } 1080 1081 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { 1082 llvm_unreachable("not yet implemented"); 1083 return 0; 1084 } 1085 1086 Expected<SymbolRef::Type> 1087 WasmObjectFile::getSymbolType(DataRefImpl Symb) const { 1088 const WasmSymbol &Sym = getWasmSymbol(Symb); 1089 1090 switch (Sym.Info.Kind) { 1091 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1092 return SymbolRef::ST_Function; 1093 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1094 return SymbolRef::ST_Other; 1095 case wasm::WASM_SYMBOL_TYPE_DATA: 1096 return SymbolRef::ST_Data; 1097 case wasm::WASM_SYMBOL_TYPE_SECTION: 1098 return SymbolRef::ST_Debug; 1099 } 1100 1101 llvm_unreachable("Unknown WasmSymbol::SymbolType"); 1102 return SymbolRef::ST_Other; 1103 } 1104 1105 Expected<section_iterator> 1106 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { 1107 const WasmSymbol& Sym = getWasmSymbol(Symb); 1108 if (Sym.isUndefined()) 1109 return section_end(); 1110 1111 DataRefImpl Ref; 1112 switch (Sym.Info.Kind) { 1113 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1114 Ref.d.a = CodeSection; 1115 break; 1116 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1117 Ref.d.a = GlobalSection; 1118 break; 1119 case wasm::WASM_SYMBOL_TYPE_DATA: 1120 Ref.d.a = DataSection; 1121 break; 1122 case wasm::WASM_SYMBOL_TYPE_SECTION: { 1123 Ref.d.a = Sym.Info.ElementIndex; 1124 break; 1125 } 1126 default: 1127 llvm_unreachable("Unknown WasmSymbol::SymbolType"); 1128 } 1129 return section_iterator(SectionRef(Ref, this)); 1130 } 1131 1132 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } 1133 1134 std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec, 1135 StringRef &Res) const { 1136 const WasmSection &S = Sections[Sec.d.a]; 1137 #define ECase(X) \ 1138 case wasm::WASM_SEC_##X: \ 1139 Res = #X; \ 1140 break 1141 switch (S.Type) { 1142 ECase(TYPE); 1143 ECase(IMPORT); 1144 ECase(FUNCTION); 1145 ECase(TABLE); 1146 ECase(MEMORY); 1147 ECase(GLOBAL); 1148 ECase(EXPORT); 1149 ECase(START); 1150 ECase(ELEM); 1151 ECase(CODE); 1152 ECase(DATA); 1153 case wasm::WASM_SEC_CUSTOM: 1154 Res = S.Name; 1155 break; 1156 default: 1157 return object_error::invalid_section_index; 1158 } 1159 #undef ECase 1160 return std::error_code(); 1161 } 1162 1163 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; } 1164 1165 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { 1166 return Sec.d.a; 1167 } 1168 1169 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { 1170 const WasmSection &S = Sections[Sec.d.a]; 1171 return S.Content.size(); 1172 } 1173 1174 std::error_code WasmObjectFile::getSectionContents(DataRefImpl Sec, 1175 StringRef &Res) const { 1176 const WasmSection &S = Sections[Sec.d.a]; 1177 // This will never fail since wasm sections can never be empty (user-sections 1178 // must have a name and non-user sections each have a defined structure). 1179 Res = StringRef(reinterpret_cast<const char *>(S.Content.data()), 1180 S.Content.size()); 1181 return std::error_code(); 1182 } 1183 1184 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { 1185 return 1; 1186 } 1187 1188 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { 1189 return false; 1190 } 1191 1192 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { 1193 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE; 1194 } 1195 1196 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { 1197 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA; 1198 } 1199 1200 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } 1201 1202 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } 1203 1204 bool WasmObjectFile::isSectionBitcode(DataRefImpl Sec) const { return false; } 1205 1206 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { 1207 DataRefImpl RelocRef; 1208 RelocRef.d.a = Ref.d.a; 1209 RelocRef.d.b = 0; 1210 return relocation_iterator(RelocationRef(RelocRef, this)); 1211 } 1212 1213 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { 1214 const WasmSection &Sec = getWasmSection(Ref); 1215 DataRefImpl RelocRef; 1216 RelocRef.d.a = Ref.d.a; 1217 RelocRef.d.b = Sec.Relocations.size(); 1218 return relocation_iterator(RelocationRef(RelocRef, this)); 1219 } 1220 1221 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { 1222 Rel.d.b++; 1223 } 1224 1225 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { 1226 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1227 return Rel.Offset; 1228 } 1229 1230 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { 1231 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1232 if (Rel.Type == wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB) 1233 return symbol_end(); 1234 DataRefImpl Sym; 1235 Sym.d.a = Rel.Index; 1236 Sym.d.b = 0; 1237 return symbol_iterator(SymbolRef(Sym, this)); 1238 } 1239 1240 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { 1241 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1242 return Rel.Type; 1243 } 1244 1245 void WasmObjectFile::getRelocationTypeName( 1246 DataRefImpl Ref, SmallVectorImpl<char> &Result) const { 1247 const wasm::WasmRelocation& Rel = getWasmRelocation(Ref); 1248 StringRef Res = "Unknown"; 1249 1250 #define WASM_RELOC(name, value) \ 1251 case wasm::name: \ 1252 Res = #name; \ 1253 break; 1254 1255 switch (Rel.Type) { 1256 #include "llvm/BinaryFormat/WasmRelocs.def" 1257 } 1258 1259 #undef WASM_RELOC 1260 1261 Result.append(Res.begin(), Res.end()); 1262 } 1263 1264 section_iterator WasmObjectFile::section_begin() const { 1265 DataRefImpl Ref; 1266 Ref.d.a = 0; 1267 return section_iterator(SectionRef(Ref, this)); 1268 } 1269 1270 section_iterator WasmObjectFile::section_end() const { 1271 DataRefImpl Ref; 1272 Ref.d.a = Sections.size(); 1273 return section_iterator(SectionRef(Ref, this)); 1274 } 1275 1276 uint8_t WasmObjectFile::getBytesInAddress() const { return 4; } 1277 1278 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } 1279 1280 Triple::ArchType WasmObjectFile::getArch() const { return Triple::wasm32; } 1281 1282 SubtargetFeatures WasmObjectFile::getFeatures() const { 1283 return SubtargetFeatures(); 1284 } 1285 1286 bool WasmObjectFile::isRelocatableObject() const { 1287 return HasLinkingSection; 1288 } 1289 1290 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { 1291 assert(Ref.d.a < Sections.size()); 1292 return Sections[Ref.d.a]; 1293 } 1294 1295 const WasmSection & 1296 WasmObjectFile::getWasmSection(const SectionRef &Section) const { 1297 return getWasmSection(Section.getRawDataRefImpl()); 1298 } 1299 1300 const wasm::WasmRelocation & 1301 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { 1302 return getWasmRelocation(Ref.getRawDataRefImpl()); 1303 } 1304 1305 const wasm::WasmRelocation & 1306 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { 1307 assert(Ref.d.a < Sections.size()); 1308 const WasmSection& Sec = Sections[Ref.d.a]; 1309 assert(Ref.d.b < Sec.Relocations.size()); 1310 return Sec.Relocations[Ref.d.b]; 1311 } 1312
