1 //===- WasmObjectFile.cpp - Wasm object file implementation ---------------===// 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 #include "llvm/ADT/ArrayRef.h" 10 #include "llvm/ADT/DenseSet.h" 11 #include "llvm/ADT/STLExtras.h" 12 #include "llvm/ADT/SmallSet.h" 13 #include "llvm/ADT/StringRef.h" 14 #include "llvm/ADT/StringSet.h" 15 #include "llvm/ADT/StringSwitch.h" 16 #include "llvm/ADT/Triple.h" 17 #include "llvm/BinaryFormat/Wasm.h" 18 #include "llvm/MC/SubtargetFeature.h" 19 #include "llvm/Object/Binary.h" 20 #include "llvm/Object/Error.h" 21 #include "llvm/Object/ObjectFile.h" 22 #include "llvm/Object/SymbolicFile.h" 23 #include "llvm/Object/Wasm.h" 24 #include "llvm/Support/Endian.h" 25 #include "llvm/Support/Error.h" 26 #include "llvm/Support/ErrorHandling.h" 27 #include "llvm/Support/LEB128.h" 28 #include "llvm/Support/ScopedPrinter.h" 29 #include <algorithm> 30 #include <cassert> 31 #include <cstdint> 32 #include <cstring> 33 #include <system_error> 34 35 #define DEBUG_TYPE "wasm-object" 36 37 using namespace llvm; 38 using namespace object; 39 40 void WasmSymbol::print(raw_ostream &Out) const { 41 Out << "Name=" << Info.Name 42 << ", Kind=" << toString(wasm::WasmSymbolType(Info.Kind)) << ", Flags=0x" 43 << Twine::utohexstr(Info.Flags); 44 if (!isTypeData()) { 45 Out << ", ElemIndex=" << Info.ElementIndex; 46 } else if (isDefined()) { 47 Out << ", Segment=" << Info.DataRef.Segment; 48 Out << ", Offset=" << Info.DataRef.Offset; 49 Out << ", Size=" << Info.DataRef.Size; 50 } 51 } 52 53 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 54 LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(dbgs()); } 55 #endif 56 57 Expected<std::unique_ptr<WasmObjectFile>> 58 ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) { 59 Error Err = Error::success(); 60 auto ObjectFile = std::make_unique<WasmObjectFile>(Buffer, Err); 61 if (Err) 62 return std::move(Err); 63 64 return std::move(ObjectFile); 65 } 66 67 #define VARINT7_MAX ((1 << 7) - 1) 68 #define VARINT7_MIN (-(1 << 7)) 69 #define VARUINT7_MAX (1 << 7) 70 #define VARUINT1_MAX (1) 71 72 static uint8_t readUint8(WasmObjectFile::ReadContext &Ctx) { 73 if (Ctx.Ptr == Ctx.End) 74 report_fatal_error("EOF while reading uint8"); 75 return *Ctx.Ptr++; 76 } 77 78 static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) { 79 if (Ctx.Ptr + 4 > Ctx.End) 80 report_fatal_error("EOF while reading uint32"); 81 uint32_t Result = support::endian::read32le(Ctx.Ptr); 82 Ctx.Ptr += 4; 83 return Result; 84 } 85 86 static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) { 87 if (Ctx.Ptr + 4 > Ctx.End) 88 report_fatal_error("EOF while reading float64"); 89 int32_t Result = 0; 90 memcpy(&Result, Ctx.Ptr, sizeof(Result)); 91 Ctx.Ptr += sizeof(Result); 92 return Result; 93 } 94 95 static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) { 96 if (Ctx.Ptr + 8 > Ctx.End) 97 report_fatal_error("EOF while reading float64"); 98 int64_t Result = 0; 99 memcpy(&Result, Ctx.Ptr, sizeof(Result)); 100 Ctx.Ptr += sizeof(Result); 101 return Result; 102 } 103 104 static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) { 105 unsigned Count; 106 const char *Error = nullptr; 107 uint64_t Result = decodeULEB128(Ctx.Ptr, &Count, Ctx.End, &Error); 108 if (Error) 109 report_fatal_error(Error); 110 Ctx.Ptr += Count; 111 return Result; 112 } 113 114 static StringRef readString(WasmObjectFile::ReadContext &Ctx) { 115 uint32_t StringLen = readULEB128(Ctx); 116 if (Ctx.Ptr + StringLen > Ctx.End) 117 report_fatal_error("EOF while reading string"); 118 StringRef Return = 119 StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen); 120 Ctx.Ptr += StringLen; 121 return Return; 122 } 123 124 static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) { 125 unsigned Count; 126 const char *Error = nullptr; 127 uint64_t Result = decodeSLEB128(Ctx.Ptr, &Count, Ctx.End, &Error); 128 if (Error) 129 report_fatal_error(Error); 130 Ctx.Ptr += Count; 131 return Result; 132 } 133 134 static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) { 135 int64_t Result = readLEB128(Ctx); 136 if (Result > VARUINT1_MAX || Result < 0) 137 report_fatal_error("LEB is outside Varuint1 range"); 138 return Result; 139 } 140 141 static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) { 142 int64_t Result = readLEB128(Ctx); 143 if (Result > INT32_MAX || Result < INT32_MIN) 144 report_fatal_error("LEB is outside Varint32 range"); 145 return Result; 146 } 147 148 static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) { 149 uint64_t Result = readULEB128(Ctx); 150 if (Result > UINT32_MAX) 151 report_fatal_error("LEB is outside Varuint32 range"); 152 return Result; 153 } 154 155 static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) { 156 return readLEB128(Ctx); 157 } 158 159 static uint64_t readVaruint64(WasmObjectFile::ReadContext &Ctx) { 160 return readULEB128(Ctx); 161 } 162 163 static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) { 164 return readUint8(Ctx); 165 } 166 167 static Error readInitExpr(wasm::WasmInitExpr &Expr, 168 WasmObjectFile::ReadContext &Ctx) { 169 Expr.Opcode = readOpcode(Ctx); 170 171 switch (Expr.Opcode) { 172 case wasm::WASM_OPCODE_I32_CONST: 173 Expr.Value.Int32 = readVarint32(Ctx); 174 break; 175 case wasm::WASM_OPCODE_I64_CONST: 176 Expr.Value.Int64 = readVarint64(Ctx); 177 break; 178 case wasm::WASM_OPCODE_F32_CONST: 179 Expr.Value.Float32 = readFloat32(Ctx); 180 break; 181 case wasm::WASM_OPCODE_F64_CONST: 182 Expr.Value.Float64 = readFloat64(Ctx); 183 break; 184 case wasm::WASM_OPCODE_GLOBAL_GET: 185 Expr.Value.Global = readULEB128(Ctx); 186 break; 187 case wasm::WASM_OPCODE_REF_NULL: { 188 wasm::ValType Ty = static_cast<wasm::ValType>(readULEB128(Ctx)); 189 if (Ty != wasm::ValType::EXTERNREF) { 190 return make_error<GenericBinaryError>("invalid type for ref.null", 191 object_error::parse_failed); 192 } 193 break; 194 } 195 default: 196 return make_error<GenericBinaryError>("invalid opcode in init_expr", 197 object_error::parse_failed); 198 } 199 200 uint8_t EndOpcode = readOpcode(Ctx); 201 if (EndOpcode != wasm::WASM_OPCODE_END) { 202 return make_error<GenericBinaryError>("invalid init_expr", 203 object_error::parse_failed); 204 } 205 return Error::success(); 206 } 207 208 static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) { 209 wasm::WasmLimits Result; 210 Result.Flags = readVaruint32(Ctx); 211 Result.Minimum = readVaruint64(Ctx); 212 if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) 213 Result.Maximum = readVaruint64(Ctx); 214 return Result; 215 } 216 217 static wasm::WasmTableType readTableType(WasmObjectFile::ReadContext &Ctx) { 218 wasm::WasmTableType TableType; 219 TableType.ElemType = readUint8(Ctx); 220 TableType.Limits = readLimits(Ctx); 221 return TableType; 222 } 223 224 static Error readSection(WasmSection &Section, WasmObjectFile::ReadContext &Ctx, 225 WasmSectionOrderChecker &Checker) { 226 Section.Offset = Ctx.Ptr - Ctx.Start; 227 Section.Type = readUint8(Ctx); 228 LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n"); 229 uint32_t Size = readVaruint32(Ctx); 230 if (Size == 0) 231 return make_error<StringError>("zero length section", 232 object_error::parse_failed); 233 if (Ctx.Ptr + Size > Ctx.End) 234 return make_error<StringError>("section too large", 235 object_error::parse_failed); 236 if (Section.Type == wasm::WASM_SEC_CUSTOM) { 237 WasmObjectFile::ReadContext SectionCtx; 238 SectionCtx.Start = Ctx.Ptr; 239 SectionCtx.Ptr = Ctx.Ptr; 240 SectionCtx.End = Ctx.Ptr + Size; 241 242 Section.Name = readString(SectionCtx); 243 244 uint32_t SectionNameSize = SectionCtx.Ptr - SectionCtx.Start; 245 Ctx.Ptr += SectionNameSize; 246 Size -= SectionNameSize; 247 } 248 249 if (!Checker.isValidSectionOrder(Section.Type, Section.Name)) { 250 return make_error<StringError>("out of order section type: " + 251 llvm::to_string(Section.Type), 252 object_error::parse_failed); 253 } 254 255 Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 256 Ctx.Ptr += Size; 257 return Error::success(); 258 } 259 260 WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) 261 : ObjectFile(Binary::ID_Wasm, Buffer) { 262 ErrorAsOutParameter ErrAsOutParam(&Err); 263 Header.Magic = getData().substr(0, 4); 264 if (Header.Magic != StringRef("\0asm", 4)) { 265 Err = make_error<StringError>("invalid magic number", 266 object_error::parse_failed); 267 return; 268 } 269 270 ReadContext Ctx; 271 Ctx.Start = getData().bytes_begin(); 272 Ctx.Ptr = Ctx.Start + 4; 273 Ctx.End = Ctx.Start + getData().size(); 274 275 if (Ctx.Ptr + 4 > Ctx.End) { 276 Err = make_error<StringError>("missing version number", 277 object_error::parse_failed); 278 return; 279 } 280 281 Header.Version = readUint32(Ctx); 282 if (Header.Version != wasm::WasmVersion) { 283 Err = make_error<StringError>("invalid version number: " + 284 Twine(Header.Version), 285 object_error::parse_failed); 286 return; 287 } 288 289 WasmSection Sec; 290 WasmSectionOrderChecker Checker; 291 while (Ctx.Ptr < Ctx.End) { 292 if ((Err = readSection(Sec, Ctx, Checker))) 293 return; 294 if ((Err = parseSection(Sec))) 295 return; 296 297 Sections.push_back(Sec); 298 } 299 } 300 301 Error WasmObjectFile::parseSection(WasmSection &Sec) { 302 ReadContext Ctx; 303 Ctx.Start = Sec.Content.data(); 304 Ctx.End = Ctx.Start + Sec.Content.size(); 305 Ctx.Ptr = Ctx.Start; 306 switch (Sec.Type) { 307 case wasm::WASM_SEC_CUSTOM: 308 return parseCustomSection(Sec, Ctx); 309 case wasm::WASM_SEC_TYPE: 310 return parseTypeSection(Ctx); 311 case wasm::WASM_SEC_IMPORT: 312 return parseImportSection(Ctx); 313 case wasm::WASM_SEC_FUNCTION: 314 return parseFunctionSection(Ctx); 315 case wasm::WASM_SEC_TABLE: 316 return parseTableSection(Ctx); 317 case wasm::WASM_SEC_MEMORY: 318 return parseMemorySection(Ctx); 319 case wasm::WASM_SEC_EVENT: 320 return parseEventSection(Ctx); 321 case wasm::WASM_SEC_GLOBAL: 322 return parseGlobalSection(Ctx); 323 case wasm::WASM_SEC_EXPORT: 324 return parseExportSection(Ctx); 325 case wasm::WASM_SEC_START: 326 return parseStartSection(Ctx); 327 case wasm::WASM_SEC_ELEM: 328 return parseElemSection(Ctx); 329 case wasm::WASM_SEC_CODE: 330 return parseCodeSection(Ctx); 331 case wasm::WASM_SEC_DATA: 332 return parseDataSection(Ctx); 333 case wasm::WASM_SEC_DATACOUNT: 334 return parseDataCountSection(Ctx); 335 default: 336 return make_error<GenericBinaryError>( 337 "invalid section type: " + Twine(Sec.Type), object_error::parse_failed); 338 } 339 } 340 341 Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) { 342 // See https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md 343 HasDylinkSection = true; 344 DylinkInfo.MemorySize = readVaruint32(Ctx); 345 DylinkInfo.MemoryAlignment = readVaruint32(Ctx); 346 DylinkInfo.TableSize = readVaruint32(Ctx); 347 DylinkInfo.TableAlignment = readVaruint32(Ctx); 348 uint32_t Count = readVaruint32(Ctx); 349 while (Count--) { 350 DylinkInfo.Needed.push_back(readString(Ctx)); 351 } 352 if (Ctx.Ptr != Ctx.End) 353 return make_error<GenericBinaryError>("dylink section ended prematurely", 354 object_error::parse_failed); 355 return Error::success(); 356 } 357 358 Error WasmObjectFile::parseNameSection(ReadContext &Ctx) { 359 llvm::DenseSet<uint64_t> SeenFunctions; 360 llvm::DenseSet<uint64_t> SeenGlobals; 361 llvm::DenseSet<uint64_t> SeenSegments; 362 if (FunctionTypes.size() && !SeenCodeSection) { 363 return make_error<GenericBinaryError>("names must come after code section", 364 object_error::parse_failed); 365 } 366 367 while (Ctx.Ptr < Ctx.End) { 368 uint8_t Type = readUint8(Ctx); 369 uint32_t Size = readVaruint32(Ctx); 370 const uint8_t *SubSectionEnd = Ctx.Ptr + Size; 371 switch (Type) { 372 case wasm::WASM_NAMES_FUNCTION: 373 case wasm::WASM_NAMES_GLOBAL: 374 case wasm::WASM_NAMES_DATA_SEGMENT: { 375 uint32_t Count = readVaruint32(Ctx); 376 while (Count--) { 377 uint32_t Index = readVaruint32(Ctx); 378 StringRef Name = readString(Ctx); 379 wasm::NameType nameType = wasm::NameType::FUNCTION; 380 if (Type == wasm::WASM_NAMES_FUNCTION) { 381 if (!SeenFunctions.insert(Index).second) 382 return make_error<GenericBinaryError>( 383 "function named more than once", object_error::parse_failed); 384 if (!isValidFunctionIndex(Index) || Name.empty()) 385 return make_error<GenericBinaryError>("invalid name entry", 386 object_error::parse_failed); 387 388 if (isDefinedFunctionIndex(Index)) 389 getDefinedFunction(Index).DebugName = Name; 390 } else if (Type == wasm::WASM_NAMES_GLOBAL) { 391 nameType = wasm::NameType::GLOBAL; 392 if (!SeenGlobals.insert(Index).second) 393 return make_error<GenericBinaryError>("global named more than once", 394 object_error::parse_failed); 395 if (!isValidGlobalIndex(Index) || Name.empty()) 396 return make_error<GenericBinaryError>("invalid name entry", 397 object_error::parse_failed); 398 } else { 399 nameType = wasm::NameType::DATA_SEGMENT; 400 if (!SeenSegments.insert(Index).second) 401 return make_error<GenericBinaryError>( 402 "segment named more than once", object_error::parse_failed); 403 if (Index > DataSegments.size()) 404 return make_error<GenericBinaryError>("invalid named data segment", 405 object_error::parse_failed); 406 } 407 DebugNames.push_back(wasm::WasmDebugName{nameType, Index, Name}); 408 } 409 break; 410 } 411 // Ignore local names for now 412 case wasm::WASM_NAMES_LOCAL: 413 default: 414 Ctx.Ptr += Size; 415 break; 416 } 417 if (Ctx.Ptr != SubSectionEnd) 418 return make_error<GenericBinaryError>( 419 "name sub-section ended prematurely", object_error::parse_failed); 420 } 421 422 if (Ctx.Ptr != Ctx.End) 423 return make_error<GenericBinaryError>("name section ended prematurely", 424 object_error::parse_failed); 425 return Error::success(); 426 } 427 428 Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) { 429 HasLinkingSection = true; 430 if (FunctionTypes.size() && !SeenCodeSection) { 431 return make_error<GenericBinaryError>( 432 "linking data must come after code section", 433 object_error::parse_failed); 434 } 435 436 LinkingData.Version = readVaruint32(Ctx); 437 if (LinkingData.Version != wasm::WasmMetadataVersion) { 438 return make_error<GenericBinaryError>( 439 "unexpected metadata version: " + Twine(LinkingData.Version) + 440 " (Expected: " + Twine(wasm::WasmMetadataVersion) + ")", 441 object_error::parse_failed); 442 } 443 444 const uint8_t *OrigEnd = Ctx.End; 445 while (Ctx.Ptr < OrigEnd) { 446 Ctx.End = OrigEnd; 447 uint8_t Type = readUint8(Ctx); 448 uint32_t Size = readVaruint32(Ctx); 449 LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size 450 << "\n"); 451 Ctx.End = Ctx.Ptr + Size; 452 switch (Type) { 453 case wasm::WASM_SYMBOL_TABLE: 454 if (Error Err = parseLinkingSectionSymtab(Ctx)) 455 return Err; 456 break; 457 case wasm::WASM_SEGMENT_INFO: { 458 uint32_t Count = readVaruint32(Ctx); 459 if (Count > DataSegments.size()) 460 return make_error<GenericBinaryError>("too many segment names", 461 object_error::parse_failed); 462 for (uint32_t I = 0; I < Count; I++) { 463 DataSegments[I].Data.Name = readString(Ctx); 464 DataSegments[I].Data.Alignment = readVaruint32(Ctx); 465 DataSegments[I].Data.LinkingFlags = readVaruint32(Ctx); 466 } 467 break; 468 } 469 case wasm::WASM_INIT_FUNCS: { 470 uint32_t Count = readVaruint32(Ctx); 471 LinkingData.InitFunctions.reserve(Count); 472 for (uint32_t I = 0; I < Count; I++) { 473 wasm::WasmInitFunc Init; 474 Init.Priority = readVaruint32(Ctx); 475 Init.Symbol = readVaruint32(Ctx); 476 if (!isValidFunctionSymbol(Init.Symbol)) 477 return make_error<GenericBinaryError>("invalid function symbol: " + 478 Twine(Init.Symbol), 479 object_error::parse_failed); 480 LinkingData.InitFunctions.emplace_back(Init); 481 } 482 break; 483 } 484 case wasm::WASM_COMDAT_INFO: 485 if (Error Err = parseLinkingSectionComdat(Ctx)) 486 return Err; 487 break; 488 default: 489 Ctx.Ptr += Size; 490 break; 491 } 492 if (Ctx.Ptr != Ctx.End) 493 return make_error<GenericBinaryError>( 494 "linking sub-section ended prematurely", object_error::parse_failed); 495 } 496 if (Ctx.Ptr != OrigEnd) 497 return make_error<GenericBinaryError>("linking section ended prematurely", 498 object_error::parse_failed); 499 return Error::success(); 500 } 501 502 Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) { 503 uint32_t Count = readVaruint32(Ctx); 504 LinkingData.SymbolTable.reserve(Count); 505 Symbols.reserve(Count); 506 StringSet<> SymbolNames; 507 508 std::vector<wasm::WasmImport *> ImportedGlobals; 509 std::vector<wasm::WasmImport *> ImportedFunctions; 510 std::vector<wasm::WasmImport *> ImportedEvents; 511 std::vector<wasm::WasmImport *> ImportedTables; 512 ImportedGlobals.reserve(Imports.size()); 513 ImportedFunctions.reserve(Imports.size()); 514 ImportedEvents.reserve(Imports.size()); 515 ImportedTables.reserve(Imports.size()); 516 for (auto &I : Imports) { 517 if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION) 518 ImportedFunctions.emplace_back(&I); 519 else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL) 520 ImportedGlobals.emplace_back(&I); 521 else if (I.Kind == wasm::WASM_EXTERNAL_EVENT) 522 ImportedEvents.emplace_back(&I); 523 else if (I.Kind == wasm::WASM_EXTERNAL_TABLE) 524 ImportedTables.emplace_back(&I); 525 } 526 527 while (Count--) { 528 wasm::WasmSymbolInfo Info; 529 const wasm::WasmSignature *Signature = nullptr; 530 const wasm::WasmGlobalType *GlobalType = nullptr; 531 const wasm::WasmTableType *TableType = nullptr; 532 const wasm::WasmEventType *EventType = nullptr; 533 534 Info.Kind = readUint8(Ctx); 535 Info.Flags = readVaruint32(Ctx); 536 bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0; 537 538 switch (Info.Kind) { 539 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 540 Info.ElementIndex = readVaruint32(Ctx); 541 if (!isValidFunctionIndex(Info.ElementIndex) || 542 IsDefined != isDefinedFunctionIndex(Info.ElementIndex)) 543 return make_error<GenericBinaryError>("invalid function symbol index", 544 object_error::parse_failed); 545 if (IsDefined) { 546 Info.Name = readString(Ctx); 547 unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; 548 Signature = &Signatures[FunctionTypes[FuncIndex]]; 549 wasm::WasmFunction &Function = Functions[FuncIndex]; 550 if (Function.SymbolName.empty()) 551 Function.SymbolName = Info.Name; 552 } else { 553 wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex]; 554 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 555 Info.Name = readString(Ctx); 556 Info.ImportName = Import.Field; 557 } else { 558 Info.Name = Import.Field; 559 } 560 Signature = &Signatures[Import.SigIndex]; 561 if (!Import.Module.empty()) { 562 Info.ImportModule = Import.Module; 563 } 564 } 565 break; 566 567 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 568 Info.ElementIndex = readVaruint32(Ctx); 569 if (!isValidGlobalIndex(Info.ElementIndex) || 570 IsDefined != isDefinedGlobalIndex(Info.ElementIndex)) 571 return make_error<GenericBinaryError>("invalid global symbol index", 572 object_error::parse_failed); 573 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 574 wasm::WASM_SYMBOL_BINDING_WEAK) 575 return make_error<GenericBinaryError>("undefined weak global symbol", 576 object_error::parse_failed); 577 if (IsDefined) { 578 Info.Name = readString(Ctx); 579 unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals; 580 wasm::WasmGlobal &Global = Globals[GlobalIndex]; 581 GlobalType = &Global.Type; 582 if (Global.SymbolName.empty()) 583 Global.SymbolName = Info.Name; 584 } else { 585 wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex]; 586 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 587 Info.Name = readString(Ctx); 588 Info.ImportName = Import.Field; 589 } else { 590 Info.Name = Import.Field; 591 } 592 GlobalType = &Import.Global; 593 if (!Import.Module.empty()) { 594 Info.ImportModule = Import.Module; 595 } 596 } 597 break; 598 599 case wasm::WASM_SYMBOL_TYPE_TABLE: 600 Info.ElementIndex = readVaruint32(Ctx); 601 if (!isValidTableNumber(Info.ElementIndex) || 602 IsDefined != isDefinedTableNumber(Info.ElementIndex)) 603 return make_error<GenericBinaryError>("invalid table symbol index", 604 object_error::parse_failed); 605 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 606 wasm::WASM_SYMBOL_BINDING_WEAK) 607 return make_error<GenericBinaryError>("undefined weak table symbol", 608 object_error::parse_failed); 609 if (IsDefined) { 610 Info.Name = readString(Ctx); 611 unsigned TableNumber = Info.ElementIndex - NumImportedTables; 612 wasm::WasmTable &Table = Tables[TableNumber]; 613 TableType = &Table.Type; 614 if (Table.SymbolName.empty()) 615 Table.SymbolName = Info.Name; 616 } else { 617 wasm::WasmImport &Import = *ImportedTables[Info.ElementIndex]; 618 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 619 Info.Name = readString(Ctx); 620 Info.ImportName = Import.Field; 621 } else { 622 Info.Name = Import.Field; 623 } 624 TableType = &Import.Table; 625 if (!Import.Module.empty()) { 626 Info.ImportModule = Import.Module; 627 } 628 } 629 break; 630 631 case wasm::WASM_SYMBOL_TYPE_DATA: 632 Info.Name = readString(Ctx); 633 if (IsDefined) { 634 auto Index = readVaruint32(Ctx); 635 if (Index >= DataSegments.size()) 636 return make_error<GenericBinaryError>("invalid data symbol index", 637 object_error::parse_failed); 638 auto Offset = readVaruint64(Ctx); 639 auto Size = readVaruint64(Ctx); 640 size_t SegmentSize = DataSegments[Index].Data.Content.size(); 641 if (Offset > SegmentSize) 642 return make_error<GenericBinaryError>( 643 "invalid data symbol offset: `" + Info.Name + "` (offset: " + 644 Twine(Offset) + " segment size: " + Twine(SegmentSize) + ")", 645 object_error::parse_failed); 646 Info.DataRef = wasm::WasmDataReference{Index, Offset, Size}; 647 } 648 break; 649 650 case wasm::WASM_SYMBOL_TYPE_SECTION: { 651 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 652 wasm::WASM_SYMBOL_BINDING_LOCAL) 653 return make_error<GenericBinaryError>( 654 "section symbols must have local binding", 655 object_error::parse_failed); 656 Info.ElementIndex = readVaruint32(Ctx); 657 // Use somewhat unique section name as symbol name. 658 StringRef SectionName = Sections[Info.ElementIndex].Name; 659 Info.Name = SectionName; 660 break; 661 } 662 663 case wasm::WASM_SYMBOL_TYPE_EVENT: { 664 Info.ElementIndex = readVaruint32(Ctx); 665 if (!isValidEventIndex(Info.ElementIndex) || 666 IsDefined != isDefinedEventIndex(Info.ElementIndex)) 667 return make_error<GenericBinaryError>("invalid event symbol index", 668 object_error::parse_failed); 669 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 670 wasm::WASM_SYMBOL_BINDING_WEAK) 671 return make_error<GenericBinaryError>("undefined weak global symbol", 672 object_error::parse_failed); 673 if (IsDefined) { 674 Info.Name = readString(Ctx); 675 unsigned EventIndex = Info.ElementIndex - NumImportedEvents; 676 wasm::WasmEvent &Event = Events[EventIndex]; 677 Signature = &Signatures[Event.Type.SigIndex]; 678 EventType = &Event.Type; 679 if (Event.SymbolName.empty()) 680 Event.SymbolName = Info.Name; 681 682 } else { 683 wasm::WasmImport &Import = *ImportedEvents[Info.ElementIndex]; 684 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 685 Info.Name = readString(Ctx); 686 Info.ImportName = Import.Field; 687 } else { 688 Info.Name = Import.Field; 689 } 690 EventType = &Import.Event; 691 Signature = &Signatures[EventType->SigIndex]; 692 if (!Import.Module.empty()) { 693 Info.ImportModule = Import.Module; 694 } 695 } 696 break; 697 } 698 699 default: 700 return make_error<GenericBinaryError>("invalid symbol type: " + 701 Twine(unsigned(Info.Kind)), 702 object_error::parse_failed); 703 } 704 705 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 706 wasm::WASM_SYMBOL_BINDING_LOCAL && 707 !SymbolNames.insert(Info.Name).second) 708 return make_error<GenericBinaryError>("duplicate symbol name " + 709 Twine(Info.Name), 710 object_error::parse_failed); 711 LinkingData.SymbolTable.emplace_back(Info); 712 Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, TableType, 713 EventType, Signature); 714 LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n"); 715 } 716 717 return Error::success(); 718 } 719 720 Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { 721 uint32_t ComdatCount = readVaruint32(Ctx); 722 StringSet<> ComdatSet; 723 for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { 724 StringRef Name = readString(Ctx); 725 if (Name.empty() || !ComdatSet.insert(Name).second) 726 return make_error<GenericBinaryError>("bad/duplicate COMDAT name " + 727 Twine(Name), 728 object_error::parse_failed); 729 LinkingData.Comdats.emplace_back(Name); 730 uint32_t Flags = readVaruint32(Ctx); 731 if (Flags != 0) 732 return make_error<GenericBinaryError>("unsupported COMDAT flags", 733 object_error::parse_failed); 734 735 uint32_t EntryCount = readVaruint32(Ctx); 736 while (EntryCount--) { 737 unsigned Kind = readVaruint32(Ctx); 738 unsigned Index = readVaruint32(Ctx); 739 switch (Kind) { 740 default: 741 return make_error<GenericBinaryError>("invalid COMDAT entry type", 742 object_error::parse_failed); 743 case wasm::WASM_COMDAT_DATA: 744 if (Index >= DataSegments.size()) 745 return make_error<GenericBinaryError>( 746 "COMDAT data index out of range", object_error::parse_failed); 747 if (DataSegments[Index].Data.Comdat != UINT32_MAX) 748 return make_error<GenericBinaryError>("data segment in two COMDATs", 749 object_error::parse_failed); 750 DataSegments[Index].Data.Comdat = ComdatIndex; 751 break; 752 case wasm::WASM_COMDAT_FUNCTION: 753 if (!isDefinedFunctionIndex(Index)) 754 return make_error<GenericBinaryError>( 755 "COMDAT function index out of range", object_error::parse_failed); 756 if (getDefinedFunction(Index).Comdat != UINT32_MAX) 757 return make_error<GenericBinaryError>("function in two COMDATs", 758 object_error::parse_failed); 759 getDefinedFunction(Index).Comdat = ComdatIndex; 760 break; 761 case wasm::WASM_COMDAT_SECTION: 762 if (Index >= Sections.size()) 763 return make_error<GenericBinaryError>( 764 "COMDAT section index out of range", object_error::parse_failed); 765 if (Sections[Index].Type != wasm::WASM_SEC_CUSTOM) 766 return make_error<GenericBinaryError>( 767 "non-custom section in a COMDAT", object_error::parse_failed); 768 Sections[Index].Comdat = ComdatIndex; 769 break; 770 } 771 } 772 } 773 return Error::success(); 774 } 775 776 Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) { 777 llvm::SmallSet<StringRef, 3> FieldsSeen; 778 uint32_t Fields = readVaruint32(Ctx); 779 for (size_t I = 0; I < Fields; ++I) { 780 StringRef FieldName = readString(Ctx); 781 if (!FieldsSeen.insert(FieldName).second) 782 return make_error<GenericBinaryError>( 783 "producers section does not have unique fields", 784 object_error::parse_failed); 785 std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr; 786 if (FieldName == "language") { 787 ProducerVec = &ProducerInfo.Languages; 788 } else if (FieldName == "processed-by") { 789 ProducerVec = &ProducerInfo.Tools; 790 } else if (FieldName == "sdk") { 791 ProducerVec = &ProducerInfo.SDKs; 792 } else { 793 return make_error<GenericBinaryError>( 794 "producers section field is not named one of language, processed-by, " 795 "or sdk", 796 object_error::parse_failed); 797 } 798 uint32_t ValueCount = readVaruint32(Ctx); 799 llvm::SmallSet<StringRef, 8> ProducersSeen; 800 for (size_t J = 0; J < ValueCount; ++J) { 801 StringRef Name = readString(Ctx); 802 StringRef Version = readString(Ctx); 803 if (!ProducersSeen.insert(Name).second) { 804 return make_error<GenericBinaryError>( 805 "producers section contains repeated producer", 806 object_error::parse_failed); 807 } 808 ProducerVec->emplace_back(std::string(Name), std::string(Version)); 809 } 810 } 811 if (Ctx.Ptr != Ctx.End) 812 return make_error<GenericBinaryError>("producers section ended prematurely", 813 object_error::parse_failed); 814 return Error::success(); 815 } 816 817 Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) { 818 llvm::SmallSet<std::string, 8> FeaturesSeen; 819 uint32_t FeatureCount = readVaruint32(Ctx); 820 for (size_t I = 0; I < FeatureCount; ++I) { 821 wasm::WasmFeatureEntry Feature; 822 Feature.Prefix = readUint8(Ctx); 823 switch (Feature.Prefix) { 824 case wasm::WASM_FEATURE_PREFIX_USED: 825 case wasm::WASM_FEATURE_PREFIX_REQUIRED: 826 case wasm::WASM_FEATURE_PREFIX_DISALLOWED: 827 break; 828 default: 829 return make_error<GenericBinaryError>("unknown feature policy prefix", 830 object_error::parse_failed); 831 } 832 Feature.Name = std::string(readString(Ctx)); 833 if (!FeaturesSeen.insert(Feature.Name).second) 834 return make_error<GenericBinaryError>( 835 "target features section contains repeated feature \"" + 836 Feature.Name + "\"", 837 object_error::parse_failed); 838 TargetFeatures.push_back(Feature); 839 } 840 if (Ctx.Ptr != Ctx.End) 841 return make_error<GenericBinaryError>( 842 "target features section ended prematurely", 843 object_error::parse_failed); 844 return Error::success(); 845 } 846 847 Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { 848 uint32_t SectionIndex = readVaruint32(Ctx); 849 if (SectionIndex >= Sections.size()) 850 return make_error<GenericBinaryError>("invalid section index", 851 object_error::parse_failed); 852 WasmSection &Section = Sections[SectionIndex]; 853 uint32_t RelocCount = readVaruint32(Ctx); 854 uint32_t EndOffset = Section.Content.size(); 855 uint32_t PreviousOffset = 0; 856 while (RelocCount--) { 857 wasm::WasmRelocation Reloc = {}; 858 uint32_t type = readVaruint32(Ctx); 859 Reloc.Type = type; 860 Reloc.Offset = readVaruint32(Ctx); 861 if (Reloc.Offset < PreviousOffset) 862 return make_error<GenericBinaryError>("relocations not in offset order", 863 object_error::parse_failed); 864 PreviousOffset = Reloc.Offset; 865 Reloc.Index = readVaruint32(Ctx); 866 switch (type) { 867 case wasm::R_WASM_FUNCTION_INDEX_LEB: 868 case wasm::R_WASM_TABLE_INDEX_SLEB: 869 case wasm::R_WASM_TABLE_INDEX_SLEB64: 870 case wasm::R_WASM_TABLE_INDEX_I32: 871 case wasm::R_WASM_TABLE_INDEX_I64: 872 case wasm::R_WASM_TABLE_INDEX_REL_SLEB: 873 case wasm::R_WASM_TABLE_INDEX_REL_SLEB64: 874 if (!isValidFunctionSymbol(Reloc.Index)) 875 return make_error<GenericBinaryError>( 876 "invalid relocation function index", object_error::parse_failed); 877 break; 878 case wasm::R_WASM_TABLE_NUMBER_LEB: 879 if (!isValidTableSymbol(Reloc.Index)) 880 return make_error<GenericBinaryError>("invalid relocation table index", 881 object_error::parse_failed); 882 break; 883 case wasm::R_WASM_TYPE_INDEX_LEB: 884 if (Reloc.Index >= Signatures.size()) 885 return make_error<GenericBinaryError>("invalid relocation type index", 886 object_error::parse_failed); 887 break; 888 case wasm::R_WASM_GLOBAL_INDEX_LEB: 889 // R_WASM_GLOBAL_INDEX_LEB are can be used against function and data 890 // symbols to refer to their GOT entries. 891 if (!isValidGlobalSymbol(Reloc.Index) && 892 !isValidDataSymbol(Reloc.Index) && 893 !isValidFunctionSymbol(Reloc.Index)) 894 return make_error<GenericBinaryError>("invalid relocation global index", 895 object_error::parse_failed); 896 break; 897 case wasm::R_WASM_GLOBAL_INDEX_I32: 898 if (!isValidGlobalSymbol(Reloc.Index)) 899 return make_error<GenericBinaryError>("invalid relocation global index", 900 object_error::parse_failed); 901 break; 902 case wasm::R_WASM_EVENT_INDEX_LEB: 903 if (!isValidEventSymbol(Reloc.Index)) 904 return make_error<GenericBinaryError>("invalid relocation event index", 905 object_error::parse_failed); 906 break; 907 case wasm::R_WASM_MEMORY_ADDR_LEB: 908 case wasm::R_WASM_MEMORY_ADDR_SLEB: 909 case wasm::R_WASM_MEMORY_ADDR_I32: 910 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB: 911 case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB: 912 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 913 if (!isValidDataSymbol(Reloc.Index)) 914 return make_error<GenericBinaryError>("invalid relocation data index", 915 object_error::parse_failed); 916 Reloc.Addend = readVarint32(Ctx); 917 break; 918 case wasm::R_WASM_MEMORY_ADDR_LEB64: 919 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 920 case wasm::R_WASM_MEMORY_ADDR_I64: 921 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB64: 922 if (!isValidDataSymbol(Reloc.Index)) 923 return make_error<GenericBinaryError>("invalid relocation data index", 924 object_error::parse_failed); 925 Reloc.Addend = readVarint64(Ctx); 926 break; 927 case wasm::R_WASM_FUNCTION_OFFSET_I32: 928 if (!isValidFunctionSymbol(Reloc.Index)) 929 return make_error<GenericBinaryError>( 930 "invalid relocation function index", object_error::parse_failed); 931 Reloc.Addend = readVarint32(Ctx); 932 break; 933 case wasm::R_WASM_FUNCTION_OFFSET_I64: 934 if (!isValidFunctionSymbol(Reloc.Index)) 935 return make_error<GenericBinaryError>( 936 "invalid relocation function index", object_error::parse_failed); 937 Reloc.Addend = readVarint64(Ctx); 938 break; 939 case wasm::R_WASM_SECTION_OFFSET_I32: 940 if (!isValidSectionSymbol(Reloc.Index)) 941 return make_error<GenericBinaryError>( 942 "invalid relocation section index", object_error::parse_failed); 943 Reloc.Addend = readVarint32(Ctx); 944 break; 945 default: 946 return make_error<GenericBinaryError>("invalid relocation type: " + 947 Twine(type), 948 object_error::parse_failed); 949 } 950 951 // Relocations must fit inside the section, and must appear in order. They 952 // also shouldn't overlap a function/element boundary, but we don't bother 953 // to check that. 954 uint64_t Size = 5; 955 if (Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LEB64 || 956 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_SLEB64 || 957 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_REL_SLEB64) 958 Size = 10; 959 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 || 960 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 || 961 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LOCREL_I32 || 962 Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 || 963 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32 || 964 Reloc.Type == wasm::R_WASM_GLOBAL_INDEX_I32) 965 Size = 4; 966 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I64 || 967 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I64 || 968 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I64) 969 Size = 8; 970 if (Reloc.Offset + Size > EndOffset) 971 return make_error<GenericBinaryError>("invalid relocation offset", 972 object_error::parse_failed); 973 974 Section.Relocations.push_back(Reloc); 975 } 976 if (Ctx.Ptr != Ctx.End) 977 return make_error<GenericBinaryError>("reloc section ended prematurely", 978 object_error::parse_failed); 979 return Error::success(); 980 } 981 982 Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { 983 if (Sec.Name == "dylink") { 984 if (Error Err = parseDylinkSection(Ctx)) 985 return Err; 986 } else if (Sec.Name == "name") { 987 if (Error Err = parseNameSection(Ctx)) 988 return Err; 989 } else if (Sec.Name == "linking") { 990 if (Error Err = parseLinkingSection(Ctx)) 991 return Err; 992 } else if (Sec.Name == "producers") { 993 if (Error Err = parseProducersSection(Ctx)) 994 return Err; 995 } else if (Sec.Name == "target_features") { 996 if (Error Err = parseTargetFeaturesSection(Ctx)) 997 return Err; 998 } else if (Sec.Name.startswith("reloc.")) { 999 if (Error Err = parseRelocSection(Sec.Name, Ctx)) 1000 return Err; 1001 } 1002 return Error::success(); 1003 } 1004 1005 Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { 1006 uint32_t Count = readVaruint32(Ctx); 1007 Signatures.reserve(Count); 1008 while (Count--) { 1009 wasm::WasmSignature Sig; 1010 uint8_t Form = readUint8(Ctx); 1011 if (Form != wasm::WASM_TYPE_FUNC) { 1012 return make_error<GenericBinaryError>("invalid signature type", 1013 object_error::parse_failed); 1014 } 1015 uint32_t ParamCount = readVaruint32(Ctx); 1016 Sig.Params.reserve(ParamCount); 1017 while (ParamCount--) { 1018 uint32_t ParamType = readUint8(Ctx); 1019 Sig.Params.push_back(wasm::ValType(ParamType)); 1020 } 1021 uint32_t ReturnCount = readVaruint32(Ctx); 1022 while (ReturnCount--) { 1023 uint32_t ReturnType = readUint8(Ctx); 1024 Sig.Returns.push_back(wasm::ValType(ReturnType)); 1025 } 1026 Signatures.push_back(std::move(Sig)); 1027 } 1028 if (Ctx.Ptr != Ctx.End) 1029 return make_error<GenericBinaryError>("type section ended prematurely", 1030 object_error::parse_failed); 1031 return Error::success(); 1032 } 1033 1034 Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { 1035 uint32_t Count = readVaruint32(Ctx); 1036 Imports.reserve(Count); 1037 for (uint32_t I = 0; I < Count; I++) { 1038 wasm::WasmImport Im; 1039 Im.Module = readString(Ctx); 1040 Im.Field = readString(Ctx); 1041 Im.Kind = readUint8(Ctx); 1042 switch (Im.Kind) { 1043 case wasm::WASM_EXTERNAL_FUNCTION: 1044 NumImportedFunctions++; 1045 Im.SigIndex = readVaruint32(Ctx); 1046 break; 1047 case wasm::WASM_EXTERNAL_GLOBAL: 1048 NumImportedGlobals++; 1049 Im.Global.Type = readUint8(Ctx); 1050 Im.Global.Mutable = readVaruint1(Ctx); 1051 break; 1052 case wasm::WASM_EXTERNAL_MEMORY: 1053 Im.Memory = readLimits(Ctx); 1054 if (Im.Memory.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1055 HasMemory64 = true; 1056 break; 1057 case wasm::WASM_EXTERNAL_TABLE: { 1058 Im.Table = readTableType(Ctx); 1059 NumImportedTables++; 1060 auto ElemType = Im.Table.ElemType; 1061 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1062 ElemType != wasm::WASM_TYPE_EXTERNREF) 1063 return make_error<GenericBinaryError>("invalid table element type", 1064 object_error::parse_failed); 1065 break; 1066 } 1067 case wasm::WASM_EXTERNAL_EVENT: 1068 NumImportedEvents++; 1069 Im.Event.Attribute = readVarint32(Ctx); 1070 Im.Event.SigIndex = readVarint32(Ctx); 1071 break; 1072 default: 1073 return make_error<GenericBinaryError>("unexpected import kind", 1074 object_error::parse_failed); 1075 } 1076 Imports.push_back(Im); 1077 } 1078 if (Ctx.Ptr != Ctx.End) 1079 return make_error<GenericBinaryError>("import section ended prematurely", 1080 object_error::parse_failed); 1081 return Error::success(); 1082 } 1083 1084 Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { 1085 uint32_t Count = readVaruint32(Ctx); 1086 FunctionTypes.reserve(Count); 1087 Functions.resize(Count); 1088 uint32_t NumTypes = Signatures.size(); 1089 while (Count--) { 1090 uint32_t Type = readVaruint32(Ctx); 1091 if (Type >= NumTypes) 1092 return make_error<GenericBinaryError>("invalid function type", 1093 object_error::parse_failed); 1094 FunctionTypes.push_back(Type); 1095 } 1096 if (Ctx.Ptr != Ctx.End) 1097 return make_error<GenericBinaryError>("function section ended prematurely", 1098 object_error::parse_failed); 1099 return Error::success(); 1100 } 1101 1102 Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { 1103 TableSection = Sections.size(); 1104 uint32_t Count = readVaruint32(Ctx); 1105 Tables.reserve(Count); 1106 while (Count--) { 1107 wasm::WasmTable T; 1108 T.Type = readTableType(Ctx); 1109 T.Index = NumImportedTables + Tables.size(); 1110 Tables.push_back(T); 1111 auto ElemType = Tables.back().Type.ElemType; 1112 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1113 ElemType != wasm::WASM_TYPE_EXTERNREF) { 1114 return make_error<GenericBinaryError>("invalid table element type", 1115 object_error::parse_failed); 1116 } 1117 } 1118 if (Ctx.Ptr != Ctx.End) 1119 return make_error<GenericBinaryError>("table section ended prematurely", 1120 object_error::parse_failed); 1121 return Error::success(); 1122 } 1123 1124 Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { 1125 uint32_t Count = readVaruint32(Ctx); 1126 Memories.reserve(Count); 1127 while (Count--) { 1128 auto Limits = readLimits(Ctx); 1129 if (Limits.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1130 HasMemory64 = true; 1131 Memories.push_back(Limits); 1132 } 1133 if (Ctx.Ptr != Ctx.End) 1134 return make_error<GenericBinaryError>("memory section ended prematurely", 1135 object_error::parse_failed); 1136 return Error::success(); 1137 } 1138 1139 Error WasmObjectFile::parseEventSection(ReadContext &Ctx) { 1140 EventSection = Sections.size(); 1141 uint32_t Count = readVaruint32(Ctx); 1142 Events.reserve(Count); 1143 while (Count--) { 1144 wasm::WasmEvent Event; 1145 Event.Index = NumImportedEvents + Events.size(); 1146 Event.Type.Attribute = readVaruint32(Ctx); 1147 Event.Type.SigIndex = readVaruint32(Ctx); 1148 Events.push_back(Event); 1149 } 1150 1151 if (Ctx.Ptr != Ctx.End) 1152 return make_error<GenericBinaryError>("event section ended prematurely", 1153 object_error::parse_failed); 1154 return Error::success(); 1155 } 1156 1157 Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { 1158 GlobalSection = Sections.size(); 1159 uint32_t Count = readVaruint32(Ctx); 1160 Globals.reserve(Count); 1161 while (Count--) { 1162 wasm::WasmGlobal Global; 1163 Global.Index = NumImportedGlobals + Globals.size(); 1164 Global.Type.Type = readUint8(Ctx); 1165 Global.Type.Mutable = readVaruint1(Ctx); 1166 if (Error Err = readInitExpr(Global.InitExpr, Ctx)) 1167 return Err; 1168 Globals.push_back(Global); 1169 } 1170 if (Ctx.Ptr != Ctx.End) 1171 return make_error<GenericBinaryError>("global section ended prematurely", 1172 object_error::parse_failed); 1173 return Error::success(); 1174 } 1175 1176 Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { 1177 uint32_t Count = readVaruint32(Ctx); 1178 Exports.reserve(Count); 1179 for (uint32_t I = 0; I < Count; I++) { 1180 wasm::WasmExport Ex; 1181 Ex.Name = readString(Ctx); 1182 Ex.Kind = readUint8(Ctx); 1183 Ex.Index = readVaruint32(Ctx); 1184 switch (Ex.Kind) { 1185 case wasm::WASM_EXTERNAL_FUNCTION: 1186 1187 if (!isDefinedFunctionIndex(Ex.Index)) 1188 return make_error<GenericBinaryError>("invalid function export", 1189 object_error::parse_failed); 1190 getDefinedFunction(Ex.Index).ExportName = Ex.Name; 1191 break; 1192 case wasm::WASM_EXTERNAL_GLOBAL: 1193 if (!isValidGlobalIndex(Ex.Index)) 1194 return make_error<GenericBinaryError>("invalid global export", 1195 object_error::parse_failed); 1196 break; 1197 case wasm::WASM_EXTERNAL_EVENT: 1198 if (!isValidEventIndex(Ex.Index)) 1199 return make_error<GenericBinaryError>("invalid event export", 1200 object_error::parse_failed); 1201 break; 1202 case wasm::WASM_EXTERNAL_MEMORY: 1203 case wasm::WASM_EXTERNAL_TABLE: 1204 break; 1205 default: 1206 return make_error<GenericBinaryError>("unexpected export kind", 1207 object_error::parse_failed); 1208 } 1209 Exports.push_back(Ex); 1210 } 1211 if (Ctx.Ptr != Ctx.End) 1212 return make_error<GenericBinaryError>("export section ended prematurely", 1213 object_error::parse_failed); 1214 return Error::success(); 1215 } 1216 1217 bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { 1218 return Index < NumImportedFunctions + FunctionTypes.size(); 1219 } 1220 1221 bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { 1222 return Index >= NumImportedFunctions && isValidFunctionIndex(Index); 1223 } 1224 1225 bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { 1226 return Index < NumImportedGlobals + Globals.size(); 1227 } 1228 1229 bool WasmObjectFile::isValidTableNumber(uint32_t Index) const { 1230 return Index < NumImportedTables + Tables.size(); 1231 } 1232 1233 bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { 1234 return Index >= NumImportedGlobals && isValidGlobalIndex(Index); 1235 } 1236 1237 bool WasmObjectFile::isDefinedTableNumber(uint32_t Index) const { 1238 return Index >= NumImportedTables && isValidTableNumber(Index); 1239 } 1240 1241 bool WasmObjectFile::isValidEventIndex(uint32_t Index) const { 1242 return Index < NumImportedEvents + Events.size(); 1243 } 1244 1245 bool WasmObjectFile::isDefinedEventIndex(uint32_t Index) const { 1246 return Index >= NumImportedEvents && isValidEventIndex(Index); 1247 } 1248 1249 bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { 1250 return Index < Symbols.size() && Symbols[Index].isTypeFunction(); 1251 } 1252 1253 bool WasmObjectFile::isValidTableSymbol(uint32_t Index) const { 1254 return Index < Symbols.size() && Symbols[Index].isTypeTable(); 1255 } 1256 1257 bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { 1258 return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); 1259 } 1260 1261 bool WasmObjectFile::isValidEventSymbol(uint32_t Index) const { 1262 return Index < Symbols.size() && Symbols[Index].isTypeEvent(); 1263 } 1264 1265 bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { 1266 return Index < Symbols.size() && Symbols[Index].isTypeData(); 1267 } 1268 1269 bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { 1270 return Index < Symbols.size() && Symbols[Index].isTypeSection(); 1271 } 1272 1273 wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { 1274 assert(isDefinedFunctionIndex(Index)); 1275 return Functions[Index - NumImportedFunctions]; 1276 } 1277 1278 const wasm::WasmFunction & 1279 WasmObjectFile::getDefinedFunction(uint32_t Index) const { 1280 assert(isDefinedFunctionIndex(Index)); 1281 return Functions[Index - NumImportedFunctions]; 1282 } 1283 1284 wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) { 1285 assert(isDefinedGlobalIndex(Index)); 1286 return Globals[Index - NumImportedGlobals]; 1287 } 1288 1289 wasm::WasmEvent &WasmObjectFile::getDefinedEvent(uint32_t Index) { 1290 assert(isDefinedEventIndex(Index)); 1291 return Events[Index - NumImportedEvents]; 1292 } 1293 1294 Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { 1295 StartFunction = readVaruint32(Ctx); 1296 if (!isValidFunctionIndex(StartFunction)) 1297 return make_error<GenericBinaryError>("invalid start function", 1298 object_error::parse_failed); 1299 return Error::success(); 1300 } 1301 1302 Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { 1303 SeenCodeSection = true; 1304 CodeSection = Sections.size(); 1305 uint32_t FunctionCount = readVaruint32(Ctx); 1306 if (FunctionCount != FunctionTypes.size()) { 1307 return make_error<GenericBinaryError>("invalid function count", 1308 object_error::parse_failed); 1309 } 1310 1311 for (uint32_t i = 0; i < FunctionCount; i++) { 1312 wasm::WasmFunction& Function = Functions[i]; 1313 const uint8_t *FunctionStart = Ctx.Ptr; 1314 uint32_t Size = readVaruint32(Ctx); 1315 const uint8_t *FunctionEnd = Ctx.Ptr + Size; 1316 1317 Function.CodeOffset = Ctx.Ptr - FunctionStart; 1318 Function.Index = NumImportedFunctions + i; 1319 Function.CodeSectionOffset = FunctionStart - Ctx.Start; 1320 Function.Size = FunctionEnd - FunctionStart; 1321 1322 uint32_t NumLocalDecls = readVaruint32(Ctx); 1323 Function.Locals.reserve(NumLocalDecls); 1324 while (NumLocalDecls--) { 1325 wasm::WasmLocalDecl Decl; 1326 Decl.Count = readVaruint32(Ctx); 1327 Decl.Type = readUint8(Ctx); 1328 Function.Locals.push_back(Decl); 1329 } 1330 1331 uint32_t BodySize = FunctionEnd - Ctx.Ptr; 1332 Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); 1333 // This will be set later when reading in the linking metadata section. 1334 Function.Comdat = UINT32_MAX; 1335 Ctx.Ptr += BodySize; 1336 assert(Ctx.Ptr == FunctionEnd); 1337 } 1338 if (Ctx.Ptr != Ctx.End) 1339 return make_error<GenericBinaryError>("code section ended prematurely", 1340 object_error::parse_failed); 1341 return Error::success(); 1342 } 1343 1344 Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { 1345 uint32_t Count = readVaruint32(Ctx); 1346 ElemSegments.reserve(Count); 1347 while (Count--) { 1348 wasm::WasmElemSegment Segment; 1349 Segment.Flags = readVaruint32(Ctx); 1350 1351 uint32_t SupportedFlags = wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER | 1352 wasm::WASM_ELEM_SEGMENT_IS_PASSIVE | 1353 wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS; 1354 if (Segment.Flags & ~SupportedFlags) 1355 return make_error<GenericBinaryError>( 1356 "Unsupported flags for element segment", object_error::parse_failed); 1357 1358 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER) 1359 Segment.TableNumber = readVaruint32(Ctx); 1360 else 1361 Segment.TableNumber = 0; 1362 if (!isValidTableNumber(Segment.TableNumber)) 1363 return make_error<GenericBinaryError>("invalid TableNumber", 1364 object_error::parse_failed); 1365 1366 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_IS_PASSIVE) { 1367 Segment.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST; 1368 Segment.Offset.Value.Int32 = 0; 1369 } else { 1370 if (Error Err = readInitExpr(Segment.Offset, Ctx)) 1371 return Err; 1372 } 1373 1374 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_MASK_HAS_ELEM_KIND) { 1375 Segment.ElemKind = readUint8(Ctx); 1376 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) { 1377 if (Segment.ElemKind != uint8_t(wasm::ValType::FUNCREF) && 1378 Segment.ElemKind != uint8_t(wasm::ValType::EXTERNREF)) { 1379 return make_error<GenericBinaryError>("invalid reference type", 1380 object_error::parse_failed); 1381 } 1382 } else { 1383 if (Segment.ElemKind != 0) 1384 return make_error<GenericBinaryError>("invalid elemtype", 1385 object_error::parse_failed); 1386 Segment.ElemKind = uint8_t(wasm::ValType::FUNCREF); 1387 } 1388 } else { 1389 Segment.ElemKind = uint8_t(wasm::ValType::FUNCREF); 1390 } 1391 1392 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) 1393 return make_error<GenericBinaryError>( 1394 "elem segment init expressions not yet implemented", 1395 object_error::parse_failed); 1396 1397 uint32_t NumElems = readVaruint32(Ctx); 1398 while (NumElems--) { 1399 Segment.Functions.push_back(readVaruint32(Ctx)); 1400 } 1401 ElemSegments.push_back(Segment); 1402 } 1403 if (Ctx.Ptr != Ctx.End) 1404 return make_error<GenericBinaryError>("elem section ended prematurely", 1405 object_error::parse_failed); 1406 return Error::success(); 1407 } 1408 1409 Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { 1410 DataSection = Sections.size(); 1411 uint32_t Count = readVaruint32(Ctx); 1412 if (DataCount && Count != DataCount.getValue()) 1413 return make_error<GenericBinaryError>( 1414 "number of data segments does not match DataCount section"); 1415 DataSegments.reserve(Count); 1416 while (Count--) { 1417 WasmSegment Segment; 1418 Segment.Data.InitFlags = readVaruint32(Ctx); 1419 Segment.Data.MemoryIndex = 1420 (Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_HAS_MEMINDEX) 1421 ? readVaruint32(Ctx) 1422 : 0; 1423 if ((Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_IS_PASSIVE) == 0) { 1424 if (Error Err = readInitExpr(Segment.Data.Offset, Ctx)) 1425 return Err; 1426 } else { 1427 Segment.Data.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST; 1428 Segment.Data.Offset.Value.Int32 = 0; 1429 } 1430 uint32_t Size = readVaruint32(Ctx); 1431 if (Size > (size_t)(Ctx.End - Ctx.Ptr)) 1432 return make_error<GenericBinaryError>("invalid segment size", 1433 object_error::parse_failed); 1434 Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 1435 // The rest of these Data fields are set later, when reading in the linking 1436 // metadata section. 1437 Segment.Data.Alignment = 0; 1438 Segment.Data.LinkingFlags = 0; 1439 Segment.Data.Comdat = UINT32_MAX; 1440 Segment.SectionOffset = Ctx.Ptr - Ctx.Start; 1441 Ctx.Ptr += Size; 1442 DataSegments.push_back(Segment); 1443 } 1444 if (Ctx.Ptr != Ctx.End) 1445 return make_error<GenericBinaryError>("data section ended prematurely", 1446 object_error::parse_failed); 1447 return Error::success(); 1448 } 1449 1450 Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) { 1451 DataCount = readVaruint32(Ctx); 1452 return Error::success(); 1453 } 1454 1455 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { 1456 return Header; 1457 } 1458 1459 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; } 1460 1461 Expected<uint32_t> WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { 1462 uint32_t Result = SymbolRef::SF_None; 1463 const WasmSymbol &Sym = getWasmSymbol(Symb); 1464 1465 LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); 1466 if (Sym.isBindingWeak()) 1467 Result |= SymbolRef::SF_Weak; 1468 if (!Sym.isBindingLocal()) 1469 Result |= SymbolRef::SF_Global; 1470 if (Sym.isHidden()) 1471 Result |= SymbolRef::SF_Hidden; 1472 if (!Sym.isDefined()) 1473 Result |= SymbolRef::SF_Undefined; 1474 if (Sym.isTypeFunction()) 1475 Result |= SymbolRef::SF_Executable; 1476 return Result; 1477 } 1478 1479 basic_symbol_iterator WasmObjectFile::symbol_begin() const { 1480 DataRefImpl Ref; 1481 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1482 Ref.d.b = 0; // Symbol index 1483 return BasicSymbolRef(Ref, this); 1484 } 1485 1486 basic_symbol_iterator WasmObjectFile::symbol_end() const { 1487 DataRefImpl Ref; 1488 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1489 Ref.d.b = Symbols.size(); // Symbol index 1490 return BasicSymbolRef(Ref, this); 1491 } 1492 1493 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { 1494 return Symbols[Symb.d.b]; 1495 } 1496 1497 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { 1498 return getWasmSymbol(Symb.getRawDataRefImpl()); 1499 } 1500 1501 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { 1502 return getWasmSymbol(Symb).Info.Name; 1503 } 1504 1505 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { 1506 auto &Sym = getWasmSymbol(Symb); 1507 if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION && 1508 isDefinedFunctionIndex(Sym.Info.ElementIndex)) 1509 return getDefinedFunction(Sym.Info.ElementIndex).CodeSectionOffset; 1510 else 1511 return getSymbolValue(Symb); 1512 } 1513 1514 uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const { 1515 switch (Sym.Info.Kind) { 1516 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1517 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1518 case wasm::WASM_SYMBOL_TYPE_EVENT: 1519 case wasm::WASM_SYMBOL_TYPE_TABLE: 1520 return Sym.Info.ElementIndex; 1521 case wasm::WASM_SYMBOL_TYPE_DATA: { 1522 // The value of a data symbol is the segment offset, plus the symbol 1523 // offset within the segment. 1524 uint32_t SegmentIndex = Sym.Info.DataRef.Segment; 1525 const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; 1526 if (Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST) { 1527 return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset; 1528 } else if (Segment.Offset.Opcode == wasm::WASM_OPCODE_I64_CONST) { 1529 return Segment.Offset.Value.Int64 + Sym.Info.DataRef.Offset; 1530 } else { 1531 llvm_unreachable("unknown init expr opcode"); 1532 } 1533 } 1534 case wasm::WASM_SYMBOL_TYPE_SECTION: 1535 return 0; 1536 } 1537 llvm_unreachable("invalid symbol type"); 1538 } 1539 1540 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { 1541 return getWasmSymbolValue(getWasmSymbol(Symb)); 1542 } 1543 1544 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { 1545 llvm_unreachable("not yet implemented"); 1546 return 0; 1547 } 1548 1549 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { 1550 llvm_unreachable("not yet implemented"); 1551 return 0; 1552 } 1553 1554 Expected<SymbolRef::Type> 1555 WasmObjectFile::getSymbolType(DataRefImpl Symb) const { 1556 const WasmSymbol &Sym = getWasmSymbol(Symb); 1557 1558 switch (Sym.Info.Kind) { 1559 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1560 return SymbolRef::ST_Function; 1561 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1562 return SymbolRef::ST_Other; 1563 case wasm::WASM_SYMBOL_TYPE_DATA: 1564 return SymbolRef::ST_Data; 1565 case wasm::WASM_SYMBOL_TYPE_SECTION: 1566 return SymbolRef::ST_Debug; 1567 case wasm::WASM_SYMBOL_TYPE_EVENT: 1568 return SymbolRef::ST_Other; 1569 case wasm::WASM_SYMBOL_TYPE_TABLE: 1570 return SymbolRef::ST_Other; 1571 } 1572 1573 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1574 return SymbolRef::ST_Other; 1575 } 1576 1577 Expected<section_iterator> 1578 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { 1579 const WasmSymbol &Sym = getWasmSymbol(Symb); 1580 if (Sym.isUndefined()) 1581 return section_end(); 1582 1583 DataRefImpl Ref; 1584 Ref.d.a = getSymbolSectionIdImpl(Sym); 1585 return section_iterator(SectionRef(Ref, this)); 1586 } 1587 1588 uint32_t WasmObjectFile::getSymbolSectionId(SymbolRef Symb) const { 1589 const WasmSymbol &Sym = getWasmSymbol(Symb); 1590 return getSymbolSectionIdImpl(Sym); 1591 } 1592 1593 uint32_t WasmObjectFile::getSymbolSectionIdImpl(const WasmSymbol &Sym) const { 1594 switch (Sym.Info.Kind) { 1595 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1596 return CodeSection; 1597 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1598 return GlobalSection; 1599 case wasm::WASM_SYMBOL_TYPE_DATA: 1600 return DataSection; 1601 case wasm::WASM_SYMBOL_TYPE_SECTION: 1602 return Sym.Info.ElementIndex; 1603 case wasm::WASM_SYMBOL_TYPE_EVENT: 1604 return EventSection; 1605 case wasm::WASM_SYMBOL_TYPE_TABLE: 1606 return TableSection; 1607 default: 1608 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1609 } 1610 } 1611 1612 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } 1613 1614 Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const { 1615 const WasmSection &S = Sections[Sec.d.a]; 1616 #define ECase(X) \ 1617 case wasm::WASM_SEC_##X: \ 1618 return #X; 1619 switch (S.Type) { 1620 ECase(TYPE); 1621 ECase(IMPORT); 1622 ECase(FUNCTION); 1623 ECase(TABLE); 1624 ECase(MEMORY); 1625 ECase(GLOBAL); 1626 ECase(EVENT); 1627 ECase(EXPORT); 1628 ECase(START); 1629 ECase(ELEM); 1630 ECase(CODE); 1631 ECase(DATA); 1632 ECase(DATACOUNT); 1633 case wasm::WASM_SEC_CUSTOM: 1634 return S.Name; 1635 default: 1636 return createStringError(object_error::invalid_section_index, ""); 1637 } 1638 #undef ECase 1639 } 1640 1641 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; } 1642 1643 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { 1644 return Sec.d.a; 1645 } 1646 1647 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { 1648 const WasmSection &S = Sections[Sec.d.a]; 1649 return S.Content.size(); 1650 } 1651 1652 Expected<ArrayRef<uint8_t>> 1653 WasmObjectFile::getSectionContents(DataRefImpl Sec) const { 1654 const WasmSection &S = Sections[Sec.d.a]; 1655 // This will never fail since wasm sections can never be empty (user-sections 1656 // must have a name and non-user sections each have a defined structure). 1657 return S.Content; 1658 } 1659 1660 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { 1661 return 1; 1662 } 1663 1664 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { 1665 return false; 1666 } 1667 1668 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { 1669 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE; 1670 } 1671 1672 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { 1673 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA; 1674 } 1675 1676 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } 1677 1678 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } 1679 1680 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { 1681 DataRefImpl RelocRef; 1682 RelocRef.d.a = Ref.d.a; 1683 RelocRef.d.b = 0; 1684 return relocation_iterator(RelocationRef(RelocRef, this)); 1685 } 1686 1687 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { 1688 const WasmSection &Sec = getWasmSection(Ref); 1689 DataRefImpl RelocRef; 1690 RelocRef.d.a = Ref.d.a; 1691 RelocRef.d.b = Sec.Relocations.size(); 1692 return relocation_iterator(RelocationRef(RelocRef, this)); 1693 } 1694 1695 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { Rel.d.b++; } 1696 1697 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { 1698 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1699 return Rel.Offset; 1700 } 1701 1702 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { 1703 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1704 if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB) 1705 return symbol_end(); 1706 DataRefImpl Sym; 1707 Sym.d.a = 1; 1708 Sym.d.b = Rel.Index; 1709 return symbol_iterator(SymbolRef(Sym, this)); 1710 } 1711 1712 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { 1713 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1714 return Rel.Type; 1715 } 1716 1717 void WasmObjectFile::getRelocationTypeName( 1718 DataRefImpl Ref, SmallVectorImpl<char> &Result) const { 1719 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1720 StringRef Res = "Unknown"; 1721 1722 #define WASM_RELOC(name, value) \ 1723 case wasm::name: \ 1724 Res = #name; \ 1725 break; 1726 1727 switch (Rel.Type) { 1728 #include "llvm/BinaryFormat/WasmRelocs.def" 1729 } 1730 1731 #undef WASM_RELOC 1732 1733 Result.append(Res.begin(), Res.end()); 1734 } 1735 1736 section_iterator WasmObjectFile::section_begin() const { 1737 DataRefImpl Ref; 1738 Ref.d.a = 0; 1739 return section_iterator(SectionRef(Ref, this)); 1740 } 1741 1742 section_iterator WasmObjectFile::section_end() const { 1743 DataRefImpl Ref; 1744 Ref.d.a = Sections.size(); 1745 return section_iterator(SectionRef(Ref, this)); 1746 } 1747 1748 uint8_t WasmObjectFile::getBytesInAddress() const { 1749 return HasMemory64 ? 8 : 4; 1750 } 1751 1752 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } 1753 1754 Triple::ArchType WasmObjectFile::getArch() const { 1755 return HasMemory64 ? Triple::wasm64 : Triple::wasm32; 1756 } 1757 1758 SubtargetFeatures WasmObjectFile::getFeatures() const { 1759 return SubtargetFeatures(); 1760 } 1761 1762 bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; } 1763 1764 bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; } 1765 1766 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { 1767 assert(Ref.d.a < Sections.size()); 1768 return Sections[Ref.d.a]; 1769 } 1770 1771 const WasmSection & 1772 WasmObjectFile::getWasmSection(const SectionRef &Section) const { 1773 return getWasmSection(Section.getRawDataRefImpl()); 1774 } 1775 1776 const wasm::WasmRelocation & 1777 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { 1778 return getWasmRelocation(Ref.getRawDataRefImpl()); 1779 } 1780 1781 const wasm::WasmRelocation & 1782 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { 1783 assert(Ref.d.a < Sections.size()); 1784 const WasmSection &Sec = Sections[Ref.d.a]; 1785 assert(Ref.d.b < Sec.Relocations.size()); 1786 return Sec.Relocations[Ref.d.b]; 1787 } 1788 1789 int WasmSectionOrderChecker::getSectionOrder(unsigned ID, 1790 StringRef CustomSectionName) { 1791 switch (ID) { 1792 case wasm::WASM_SEC_CUSTOM: 1793 return StringSwitch<unsigned>(CustomSectionName) 1794 .Case("dylink", WASM_SEC_ORDER_DYLINK) 1795 .Case("linking", WASM_SEC_ORDER_LINKING) 1796 .StartsWith("reloc.", WASM_SEC_ORDER_RELOC) 1797 .Case("name", WASM_SEC_ORDER_NAME) 1798 .Case("producers", WASM_SEC_ORDER_PRODUCERS) 1799 .Case("target_features", WASM_SEC_ORDER_TARGET_FEATURES) 1800 .Default(WASM_SEC_ORDER_NONE); 1801 case wasm::WASM_SEC_TYPE: 1802 return WASM_SEC_ORDER_TYPE; 1803 case wasm::WASM_SEC_IMPORT: 1804 return WASM_SEC_ORDER_IMPORT; 1805 case wasm::WASM_SEC_FUNCTION: 1806 return WASM_SEC_ORDER_FUNCTION; 1807 case wasm::WASM_SEC_TABLE: 1808 return WASM_SEC_ORDER_TABLE; 1809 case wasm::WASM_SEC_MEMORY: 1810 return WASM_SEC_ORDER_MEMORY; 1811 case wasm::WASM_SEC_GLOBAL: 1812 return WASM_SEC_ORDER_GLOBAL; 1813 case wasm::WASM_SEC_EXPORT: 1814 return WASM_SEC_ORDER_EXPORT; 1815 case wasm::WASM_SEC_START: 1816 return WASM_SEC_ORDER_START; 1817 case wasm::WASM_SEC_ELEM: 1818 return WASM_SEC_ORDER_ELEM; 1819 case wasm::WASM_SEC_CODE: 1820 return WASM_SEC_ORDER_CODE; 1821 case wasm::WASM_SEC_DATA: 1822 return WASM_SEC_ORDER_DATA; 1823 case wasm::WASM_SEC_DATACOUNT: 1824 return WASM_SEC_ORDER_DATACOUNT; 1825 case wasm::WASM_SEC_EVENT: 1826 return WASM_SEC_ORDER_EVENT; 1827 default: 1828 return WASM_SEC_ORDER_NONE; 1829 } 1830 } 1831 1832 // Represents the edges in a directed graph where any node B reachable from node 1833 // A is not allowed to appear before A in the section ordering, but may appear 1834 // afterward. 1835 int WasmSectionOrderChecker::DisallowedPredecessors 1836 [WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = { 1837 // WASM_SEC_ORDER_NONE 1838 {}, 1839 // WASM_SEC_ORDER_TYPE 1840 {WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, 1841 // WASM_SEC_ORDER_IMPORT 1842 {WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, 1843 // WASM_SEC_ORDER_FUNCTION 1844 {WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, 1845 // WASM_SEC_ORDER_TABLE 1846 {WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, 1847 // WASM_SEC_ORDER_MEMORY 1848 {WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_EVENT}, 1849 // WASM_SEC_ORDER_EVENT 1850 {WASM_SEC_ORDER_EVENT, WASM_SEC_ORDER_GLOBAL}, 1851 // WASM_SEC_ORDER_GLOBAL 1852 {WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EXPORT}, 1853 // WASM_SEC_ORDER_EXPORT 1854 {WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, 1855 // WASM_SEC_ORDER_START 1856 {WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, 1857 // WASM_SEC_ORDER_ELEM 1858 {WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, 1859 // WASM_SEC_ORDER_DATACOUNT 1860 {WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, 1861 // WASM_SEC_ORDER_CODE 1862 {WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, 1863 // WASM_SEC_ORDER_DATA 1864 {WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, 1865 1866 // Custom Sections 1867 // WASM_SEC_ORDER_DYLINK 1868 {WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, 1869 // WASM_SEC_ORDER_LINKING 1870 {WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, 1871 // WASM_SEC_ORDER_RELOC (can be repeated) 1872 {}, 1873 // WASM_SEC_ORDER_NAME 1874 {WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, 1875 // WASM_SEC_ORDER_PRODUCERS 1876 {WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, 1877 // WASM_SEC_ORDER_TARGET_FEATURES 1878 {WASM_SEC_ORDER_TARGET_FEATURES}}; 1879 1880 bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID, 1881 StringRef CustomSectionName) { 1882 int Order = getSectionOrder(ID, CustomSectionName); 1883 if (Order == WASM_SEC_ORDER_NONE) 1884 return true; 1885 1886 // Disallowed predecessors we need to check for 1887 SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList; 1888 1889 // Keep track of completed checks to avoid repeating work 1890 bool Checked[WASM_NUM_SEC_ORDERS] = {}; 1891 1892 int Curr = Order; 1893 while (true) { 1894 // Add new disallowed predecessors to work list 1895 for (size_t I = 0;; ++I) { 1896 int Next = DisallowedPredecessors[Curr][I]; 1897 if (Next == WASM_SEC_ORDER_NONE) 1898 break; 1899 if (Checked[Next]) 1900 continue; 1901 WorkList.push_back(Next); 1902 Checked[Next] = true; 1903 } 1904 1905 if (WorkList.empty()) 1906 break; 1907 1908 // Consider next disallowed predecessor 1909 Curr = WorkList.pop_back_val(); 1910 if (Seen[Curr]) 1911 return false; 1912 } 1913 1914 // Have not seen any disallowed predecessors 1915 Seen[Order] = true; 1916 return true; 1917 } 1918
Indexes created Tue Feb 24 08:35:24 UTC 2026