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)) 43 << ", Flags=" << 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.Initial = 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.LinkerFlags = 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 (!isValidTableIndex(Info.ElementIndex) || 602 IsDefined != isDefinedTableIndex(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 TableIndex = Info.ElementIndex - NumImportedTables; 612 wasm::WasmTable &Table = Tables[TableIndex]; 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 if (Offset + Size > DataSegments[Index].Data.Content.size()) 641 return make_error<GenericBinaryError>("invalid data symbol offset", 642 object_error::parse_failed); 643 Info.DataRef = wasm::WasmDataReference{Index, Offset, Size}; 644 } 645 break; 646 647 case wasm::WASM_SYMBOL_TYPE_SECTION: { 648 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 649 wasm::WASM_SYMBOL_BINDING_LOCAL) 650 return make_error<GenericBinaryError>( 651 "section symbols must have local binding", 652 object_error::parse_failed); 653 Info.ElementIndex = readVaruint32(Ctx); 654 // Use somewhat unique section name as symbol name. 655 StringRef SectionName = Sections[Info.ElementIndex].Name; 656 Info.Name = SectionName; 657 break; 658 } 659 660 case wasm::WASM_SYMBOL_TYPE_EVENT: { 661 Info.ElementIndex = readVaruint32(Ctx); 662 if (!isValidEventIndex(Info.ElementIndex) || 663 IsDefined != isDefinedEventIndex(Info.ElementIndex)) 664 return make_error<GenericBinaryError>("invalid event symbol index", 665 object_error::parse_failed); 666 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 667 wasm::WASM_SYMBOL_BINDING_WEAK) 668 return make_error<GenericBinaryError>("undefined weak global symbol", 669 object_error::parse_failed); 670 if (IsDefined) { 671 Info.Name = readString(Ctx); 672 unsigned EventIndex = Info.ElementIndex - NumImportedEvents; 673 wasm::WasmEvent &Event = Events[EventIndex]; 674 Signature = &Signatures[Event.Type.SigIndex]; 675 EventType = &Event.Type; 676 if (Event.SymbolName.empty()) 677 Event.SymbolName = Info.Name; 678 679 } else { 680 wasm::WasmImport &Import = *ImportedEvents[Info.ElementIndex]; 681 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 682 Info.Name = readString(Ctx); 683 Info.ImportName = Import.Field; 684 } else { 685 Info.Name = Import.Field; 686 } 687 EventType = &Import.Event; 688 Signature = &Signatures[EventType->SigIndex]; 689 if (!Import.Module.empty()) { 690 Info.ImportModule = Import.Module; 691 } 692 } 693 break; 694 } 695 696 default: 697 return make_error<GenericBinaryError>("invalid symbol type: " + 698 Twine(unsigned(Info.Kind)), 699 object_error::parse_failed); 700 } 701 702 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 703 wasm::WASM_SYMBOL_BINDING_LOCAL && 704 !SymbolNames.insert(Info.Name).second) 705 return make_error<GenericBinaryError>("duplicate symbol name " + 706 Twine(Info.Name), 707 object_error::parse_failed); 708 LinkingData.SymbolTable.emplace_back(Info); 709 Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, TableType, 710 EventType, Signature); 711 LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n"); 712 } 713 714 return Error::success(); 715 } 716 717 Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { 718 uint32_t ComdatCount = readVaruint32(Ctx); 719 StringSet<> ComdatSet; 720 for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { 721 StringRef Name = readString(Ctx); 722 if (Name.empty() || !ComdatSet.insert(Name).second) 723 return make_error<GenericBinaryError>("bad/duplicate COMDAT name " + 724 Twine(Name), 725 object_error::parse_failed); 726 LinkingData.Comdats.emplace_back(Name); 727 uint32_t Flags = readVaruint32(Ctx); 728 if (Flags != 0) 729 return make_error<GenericBinaryError>("unsupported COMDAT flags", 730 object_error::parse_failed); 731 732 uint32_t EntryCount = readVaruint32(Ctx); 733 while (EntryCount--) { 734 unsigned Kind = readVaruint32(Ctx); 735 unsigned Index = readVaruint32(Ctx); 736 switch (Kind) { 737 default: 738 return make_error<GenericBinaryError>("invalid COMDAT entry type", 739 object_error::parse_failed); 740 case wasm::WASM_COMDAT_DATA: 741 if (Index >= DataSegments.size()) 742 return make_error<GenericBinaryError>( 743 "COMDAT data index out of range", object_error::parse_failed); 744 if (DataSegments[Index].Data.Comdat != UINT32_MAX) 745 return make_error<GenericBinaryError>("data segment in two COMDATs", 746 object_error::parse_failed); 747 DataSegments[Index].Data.Comdat = ComdatIndex; 748 break; 749 case wasm::WASM_COMDAT_FUNCTION: 750 if (!isDefinedFunctionIndex(Index)) 751 return make_error<GenericBinaryError>( 752 "COMDAT function index out of range", object_error::parse_failed); 753 if (getDefinedFunction(Index).Comdat != UINT32_MAX) 754 return make_error<GenericBinaryError>("function in two COMDATs", 755 object_error::parse_failed); 756 getDefinedFunction(Index).Comdat = ComdatIndex; 757 break; 758 case wasm::WASM_COMDAT_SECTION: 759 if (Index >= Sections.size()) 760 return make_error<GenericBinaryError>( 761 "COMDAT section index out of range", object_error::parse_failed); 762 if (Sections[Index].Type != wasm::WASM_SEC_CUSTOM) 763 return make_error<GenericBinaryError>( 764 "non-custom section in a COMDAT", object_error::parse_failed); 765 Sections[Index].Comdat = ComdatIndex; 766 break; 767 } 768 } 769 } 770 return Error::success(); 771 } 772 773 Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) { 774 llvm::SmallSet<StringRef, 3> FieldsSeen; 775 uint32_t Fields = readVaruint32(Ctx); 776 for (size_t I = 0; I < Fields; ++I) { 777 StringRef FieldName = readString(Ctx); 778 if (!FieldsSeen.insert(FieldName).second) 779 return make_error<GenericBinaryError>( 780 "producers section does not have unique fields", 781 object_error::parse_failed); 782 std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr; 783 if (FieldName == "language") { 784 ProducerVec = &ProducerInfo.Languages; 785 } else if (FieldName == "processed-by") { 786 ProducerVec = &ProducerInfo.Tools; 787 } else if (FieldName == "sdk") { 788 ProducerVec = &ProducerInfo.SDKs; 789 } else { 790 return make_error<GenericBinaryError>( 791 "producers section field is not named one of language, processed-by, " 792 "or sdk", 793 object_error::parse_failed); 794 } 795 uint32_t ValueCount = readVaruint32(Ctx); 796 llvm::SmallSet<StringRef, 8> ProducersSeen; 797 for (size_t J = 0; J < ValueCount; ++J) { 798 StringRef Name = readString(Ctx); 799 StringRef Version = readString(Ctx); 800 if (!ProducersSeen.insert(Name).second) { 801 return make_error<GenericBinaryError>( 802 "producers section contains repeated producer", 803 object_error::parse_failed); 804 } 805 ProducerVec->emplace_back(std::string(Name), std::string(Version)); 806 } 807 } 808 if (Ctx.Ptr != Ctx.End) 809 return make_error<GenericBinaryError>("producers section ended prematurely", 810 object_error::parse_failed); 811 return Error::success(); 812 } 813 814 Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) { 815 llvm::SmallSet<std::string, 8> FeaturesSeen; 816 uint32_t FeatureCount = readVaruint32(Ctx); 817 for (size_t I = 0; I < FeatureCount; ++I) { 818 wasm::WasmFeatureEntry Feature; 819 Feature.Prefix = readUint8(Ctx); 820 switch (Feature.Prefix) { 821 case wasm::WASM_FEATURE_PREFIX_USED: 822 case wasm::WASM_FEATURE_PREFIX_REQUIRED: 823 case wasm::WASM_FEATURE_PREFIX_DISALLOWED: 824 break; 825 default: 826 return make_error<GenericBinaryError>("unknown feature policy prefix", 827 object_error::parse_failed); 828 } 829 Feature.Name = std::string(readString(Ctx)); 830 if (!FeaturesSeen.insert(Feature.Name).second) 831 return make_error<GenericBinaryError>( 832 "target features section contains repeated feature \"" + 833 Feature.Name + "\"", 834 object_error::parse_failed); 835 TargetFeatures.push_back(Feature); 836 } 837 if (Ctx.Ptr != Ctx.End) 838 return make_error<GenericBinaryError>( 839 "target features section ended prematurely", 840 object_error::parse_failed); 841 return Error::success(); 842 } 843 844 Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { 845 uint32_t SectionIndex = readVaruint32(Ctx); 846 if (SectionIndex >= Sections.size()) 847 return make_error<GenericBinaryError>("invalid section index", 848 object_error::parse_failed); 849 WasmSection &Section = Sections[SectionIndex]; 850 uint32_t RelocCount = readVaruint32(Ctx); 851 uint32_t EndOffset = Section.Content.size(); 852 uint32_t PreviousOffset = 0; 853 while (RelocCount--) { 854 wasm::WasmRelocation Reloc = {}; 855 uint32_t type = readVaruint32(Ctx); 856 Reloc.Type = type; 857 Reloc.Offset = readVaruint32(Ctx); 858 if (Reloc.Offset < PreviousOffset) 859 return make_error<GenericBinaryError>("relocations not in offset order", 860 object_error::parse_failed); 861 PreviousOffset = Reloc.Offset; 862 Reloc.Index = readVaruint32(Ctx); 863 switch (type) { 864 case wasm::R_WASM_FUNCTION_INDEX_LEB: 865 case wasm::R_WASM_TABLE_INDEX_SLEB: 866 case wasm::R_WASM_TABLE_INDEX_SLEB64: 867 case wasm::R_WASM_TABLE_INDEX_I32: 868 case wasm::R_WASM_TABLE_INDEX_I64: 869 case wasm::R_WASM_TABLE_INDEX_REL_SLEB: 870 if (!isValidFunctionSymbol(Reloc.Index)) 871 return make_error<GenericBinaryError>( 872 "invalid relocation function index", object_error::parse_failed); 873 break; 874 case wasm::R_WASM_TABLE_NUMBER_LEB: 875 if (!isValidTableSymbol(Reloc.Index)) 876 return make_error<GenericBinaryError>("invalid relocation table index", 877 object_error::parse_failed); 878 break; 879 case wasm::R_WASM_TYPE_INDEX_LEB: 880 if (Reloc.Index >= Signatures.size()) 881 return make_error<GenericBinaryError>("invalid relocation type index", 882 object_error::parse_failed); 883 break; 884 case wasm::R_WASM_GLOBAL_INDEX_LEB: 885 // R_WASM_GLOBAL_INDEX_LEB are can be used against function and data 886 // symbols to refer to their GOT entries. 887 if (!isValidGlobalSymbol(Reloc.Index) && 888 !isValidDataSymbol(Reloc.Index) && 889 !isValidFunctionSymbol(Reloc.Index)) 890 return make_error<GenericBinaryError>("invalid relocation global index", 891 object_error::parse_failed); 892 break; 893 case wasm::R_WASM_GLOBAL_INDEX_I32: 894 if (!isValidGlobalSymbol(Reloc.Index)) 895 return make_error<GenericBinaryError>("invalid relocation global index", 896 object_error::parse_failed); 897 break; 898 case wasm::R_WASM_EVENT_INDEX_LEB: 899 if (!isValidEventSymbol(Reloc.Index)) 900 return make_error<GenericBinaryError>("invalid relocation event index", 901 object_error::parse_failed); 902 break; 903 case wasm::R_WASM_MEMORY_ADDR_LEB: 904 case wasm::R_WASM_MEMORY_ADDR_SLEB: 905 case wasm::R_WASM_MEMORY_ADDR_I32: 906 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB: 907 case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB: 908 if (!isValidDataSymbol(Reloc.Index)) 909 return make_error<GenericBinaryError>("invalid relocation data index", 910 object_error::parse_failed); 911 Reloc.Addend = readVarint32(Ctx); 912 break; 913 case wasm::R_WASM_MEMORY_ADDR_LEB64: 914 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 915 case wasm::R_WASM_MEMORY_ADDR_I64: 916 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB64: 917 if (!isValidDataSymbol(Reloc.Index)) 918 return make_error<GenericBinaryError>("invalid relocation data index", 919 object_error::parse_failed); 920 Reloc.Addend = readVarint64(Ctx); 921 break; 922 case wasm::R_WASM_FUNCTION_OFFSET_I32: 923 if (!isValidFunctionSymbol(Reloc.Index)) 924 return make_error<GenericBinaryError>( 925 "invalid relocation function index", object_error::parse_failed); 926 Reloc.Addend = readVarint32(Ctx); 927 break; 928 case wasm::R_WASM_FUNCTION_OFFSET_I64: 929 if (!isValidFunctionSymbol(Reloc.Index)) 930 return make_error<GenericBinaryError>( 931 "invalid relocation function index", object_error::parse_failed); 932 Reloc.Addend = readVarint64(Ctx); 933 break; 934 case wasm::R_WASM_SECTION_OFFSET_I32: 935 if (!isValidSectionSymbol(Reloc.Index)) 936 return make_error<GenericBinaryError>( 937 "invalid relocation section index", object_error::parse_failed); 938 Reloc.Addend = readVarint32(Ctx); 939 break; 940 default: 941 return make_error<GenericBinaryError>("invalid relocation type: " + 942 Twine(type), 943 object_error::parse_failed); 944 } 945 946 // Relocations must fit inside the section, and must appear in order. They 947 // also shouldn't overlap a function/element boundary, but we don't bother 948 // to check that. 949 uint64_t Size = 5; 950 if (Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LEB64 || 951 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_SLEB64 || 952 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_REL_SLEB64) 953 Size = 10; 954 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 || 955 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 || 956 Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 || 957 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32 || 958 Reloc.Type == wasm::R_WASM_GLOBAL_INDEX_I32) 959 Size = 4; 960 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I64 || 961 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I64 || 962 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I64) 963 Size = 8; 964 if (Reloc.Offset + Size > EndOffset) 965 return make_error<GenericBinaryError>("invalid relocation offset", 966 object_error::parse_failed); 967 968 Section.Relocations.push_back(Reloc); 969 } 970 if (Ctx.Ptr != Ctx.End) 971 return make_error<GenericBinaryError>("reloc section ended prematurely", 972 object_error::parse_failed); 973 return Error::success(); 974 } 975 976 Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { 977 if (Sec.Name == "dylink") { 978 if (Error Err = parseDylinkSection(Ctx)) 979 return Err; 980 } else if (Sec.Name == "name") { 981 if (Error Err = parseNameSection(Ctx)) 982 return Err; 983 } else if (Sec.Name == "linking") { 984 if (Error Err = parseLinkingSection(Ctx)) 985 return Err; 986 } else if (Sec.Name == "producers") { 987 if (Error Err = parseProducersSection(Ctx)) 988 return Err; 989 } else if (Sec.Name == "target_features") { 990 if (Error Err = parseTargetFeaturesSection(Ctx)) 991 return Err; 992 } else if (Sec.Name.startswith("reloc.")) { 993 if (Error Err = parseRelocSection(Sec.Name, Ctx)) 994 return Err; 995 } 996 return Error::success(); 997 } 998 999 Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { 1000 uint32_t Count = readVaruint32(Ctx); 1001 Signatures.reserve(Count); 1002 while (Count--) { 1003 wasm::WasmSignature Sig; 1004 uint8_t Form = readUint8(Ctx); 1005 if (Form != wasm::WASM_TYPE_FUNC) { 1006 return make_error<GenericBinaryError>("invalid signature type", 1007 object_error::parse_failed); 1008 } 1009 uint32_t ParamCount = readVaruint32(Ctx); 1010 Sig.Params.reserve(ParamCount); 1011 while (ParamCount--) { 1012 uint32_t ParamType = readUint8(Ctx); 1013 Sig.Params.push_back(wasm::ValType(ParamType)); 1014 } 1015 uint32_t ReturnCount = readVaruint32(Ctx); 1016 while (ReturnCount--) { 1017 uint32_t ReturnType = readUint8(Ctx); 1018 Sig.Returns.push_back(wasm::ValType(ReturnType)); 1019 } 1020 Signatures.push_back(std::move(Sig)); 1021 } 1022 if (Ctx.Ptr != Ctx.End) 1023 return make_error<GenericBinaryError>("type section ended prematurely", 1024 object_error::parse_failed); 1025 return Error::success(); 1026 } 1027 1028 Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { 1029 uint32_t Count = readVaruint32(Ctx); 1030 Imports.reserve(Count); 1031 for (uint32_t I = 0; I < Count; I++) { 1032 wasm::WasmImport Im; 1033 Im.Module = readString(Ctx); 1034 Im.Field = readString(Ctx); 1035 Im.Kind = readUint8(Ctx); 1036 switch (Im.Kind) { 1037 case wasm::WASM_EXTERNAL_FUNCTION: 1038 NumImportedFunctions++; 1039 Im.SigIndex = readVaruint32(Ctx); 1040 break; 1041 case wasm::WASM_EXTERNAL_GLOBAL: 1042 NumImportedGlobals++; 1043 Im.Global.Type = readUint8(Ctx); 1044 Im.Global.Mutable = readVaruint1(Ctx); 1045 break; 1046 case wasm::WASM_EXTERNAL_MEMORY: 1047 Im.Memory = readLimits(Ctx); 1048 if (Im.Memory.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1049 HasMemory64 = true; 1050 break; 1051 case wasm::WASM_EXTERNAL_TABLE: { 1052 Im.Table = readTableType(Ctx); 1053 NumImportedTables++; 1054 auto ElemType = Im.Table.ElemType; 1055 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1056 ElemType != wasm::WASM_TYPE_EXTERNREF) 1057 return make_error<GenericBinaryError>("invalid table element type", 1058 object_error::parse_failed); 1059 break; 1060 } 1061 case wasm::WASM_EXTERNAL_EVENT: 1062 NumImportedEvents++; 1063 Im.Event.Attribute = readVarint32(Ctx); 1064 Im.Event.SigIndex = readVarint32(Ctx); 1065 break; 1066 default: 1067 return make_error<GenericBinaryError>("unexpected import kind", 1068 object_error::parse_failed); 1069 } 1070 Imports.push_back(Im); 1071 } 1072 if (Ctx.Ptr != Ctx.End) 1073 return make_error<GenericBinaryError>("import section ended prematurely", 1074 object_error::parse_failed); 1075 return Error::success(); 1076 } 1077 1078 Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { 1079 uint32_t Count = readVaruint32(Ctx); 1080 FunctionTypes.reserve(Count); 1081 Functions.resize(Count); 1082 uint32_t NumTypes = Signatures.size(); 1083 while (Count--) { 1084 uint32_t Type = readVaruint32(Ctx); 1085 if (Type >= NumTypes) 1086 return make_error<GenericBinaryError>("invalid function type", 1087 object_error::parse_failed); 1088 FunctionTypes.push_back(Type); 1089 } 1090 if (Ctx.Ptr != Ctx.End) 1091 return make_error<GenericBinaryError>("function section ended prematurely", 1092 object_error::parse_failed); 1093 return Error::success(); 1094 } 1095 1096 Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { 1097 TableSection = Sections.size(); 1098 uint32_t Count = readVaruint32(Ctx); 1099 Tables.reserve(Count); 1100 while (Count--) { 1101 wasm::WasmTable T; 1102 T.Type = readTableType(Ctx); 1103 T.Index = NumImportedTables + Tables.size(); 1104 Tables.push_back(T); 1105 auto ElemType = Tables.back().Type.ElemType; 1106 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1107 ElemType != wasm::WASM_TYPE_EXTERNREF) { 1108 return make_error<GenericBinaryError>("invalid table element type", 1109 object_error::parse_failed); 1110 } 1111 } 1112 if (Ctx.Ptr != Ctx.End) 1113 return make_error<GenericBinaryError>("table section ended prematurely", 1114 object_error::parse_failed); 1115 return Error::success(); 1116 } 1117 1118 Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { 1119 uint32_t Count = readVaruint32(Ctx); 1120 Memories.reserve(Count); 1121 while (Count--) { 1122 auto Limits = readLimits(Ctx); 1123 if (Limits.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1124 HasMemory64 = true; 1125 Memories.push_back(Limits); 1126 } 1127 if (Ctx.Ptr != Ctx.End) 1128 return make_error<GenericBinaryError>("memory section ended prematurely", 1129 object_error::parse_failed); 1130 return Error::success(); 1131 } 1132 1133 Error WasmObjectFile::parseEventSection(ReadContext &Ctx) { 1134 EventSection = Sections.size(); 1135 uint32_t Count = readVarint32(Ctx); 1136 Events.reserve(Count); 1137 while (Count--) { 1138 wasm::WasmEvent Event; 1139 Event.Index = NumImportedEvents + Events.size(); 1140 Event.Type.Attribute = readVaruint32(Ctx); 1141 Event.Type.SigIndex = readVarint32(Ctx); 1142 Events.push_back(Event); 1143 } 1144 1145 if (Ctx.Ptr != Ctx.End) 1146 return make_error<GenericBinaryError>("event section ended prematurely", 1147 object_error::parse_failed); 1148 return Error::success(); 1149 } 1150 1151 Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { 1152 GlobalSection = Sections.size(); 1153 uint32_t Count = readVaruint32(Ctx); 1154 Globals.reserve(Count); 1155 while (Count--) { 1156 wasm::WasmGlobal Global; 1157 Global.Index = NumImportedGlobals + Globals.size(); 1158 Global.Type.Type = readUint8(Ctx); 1159 Global.Type.Mutable = readVaruint1(Ctx); 1160 if (Error Err = readInitExpr(Global.InitExpr, Ctx)) 1161 return Err; 1162 Globals.push_back(Global); 1163 } 1164 if (Ctx.Ptr != Ctx.End) 1165 return make_error<GenericBinaryError>("global section ended prematurely", 1166 object_error::parse_failed); 1167 return Error::success(); 1168 } 1169 1170 Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { 1171 uint32_t Count = readVaruint32(Ctx); 1172 Exports.reserve(Count); 1173 for (uint32_t I = 0; I < Count; I++) { 1174 wasm::WasmExport Ex; 1175 Ex.Name = readString(Ctx); 1176 Ex.Kind = readUint8(Ctx); 1177 Ex.Index = readVaruint32(Ctx); 1178 switch (Ex.Kind) { 1179 case wasm::WASM_EXTERNAL_FUNCTION: 1180 1181 if (!isDefinedFunctionIndex(Ex.Index)) 1182 return make_error<GenericBinaryError>("invalid function export", 1183 object_error::parse_failed); 1184 getDefinedFunction(Ex.Index).ExportName = Ex.Name; 1185 break; 1186 case wasm::WASM_EXTERNAL_GLOBAL: 1187 if (!isValidGlobalIndex(Ex.Index)) 1188 return make_error<GenericBinaryError>("invalid global export", 1189 object_error::parse_failed); 1190 break; 1191 case wasm::WASM_EXTERNAL_EVENT: 1192 if (!isValidEventIndex(Ex.Index)) 1193 return make_error<GenericBinaryError>("invalid event export", 1194 object_error::parse_failed); 1195 break; 1196 case wasm::WASM_EXTERNAL_MEMORY: 1197 case wasm::WASM_EXTERNAL_TABLE: 1198 break; 1199 default: 1200 return make_error<GenericBinaryError>("unexpected export kind", 1201 object_error::parse_failed); 1202 } 1203 Exports.push_back(Ex); 1204 } 1205 if (Ctx.Ptr != Ctx.End) 1206 return make_error<GenericBinaryError>("export section ended prematurely", 1207 object_error::parse_failed); 1208 return Error::success(); 1209 } 1210 1211 bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { 1212 return Index < NumImportedFunctions + FunctionTypes.size(); 1213 } 1214 1215 bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { 1216 return Index >= NumImportedFunctions && isValidFunctionIndex(Index); 1217 } 1218 1219 bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { 1220 return Index < NumImportedGlobals + Globals.size(); 1221 } 1222 1223 bool WasmObjectFile::isValidTableIndex(uint32_t Index) const { 1224 return Index < NumImportedTables + Tables.size(); 1225 } 1226 1227 bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { 1228 return Index >= NumImportedGlobals && isValidGlobalIndex(Index); 1229 } 1230 1231 bool WasmObjectFile::isDefinedTableIndex(uint32_t Index) const { 1232 return Index >= NumImportedTables && isValidTableIndex(Index); 1233 } 1234 1235 bool WasmObjectFile::isValidEventIndex(uint32_t Index) const { 1236 return Index < NumImportedEvents + Events.size(); 1237 } 1238 1239 bool WasmObjectFile::isDefinedEventIndex(uint32_t Index) const { 1240 return Index >= NumImportedEvents && isValidEventIndex(Index); 1241 } 1242 1243 bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { 1244 return Index < Symbols.size() && Symbols[Index].isTypeFunction(); 1245 } 1246 1247 bool WasmObjectFile::isValidTableSymbol(uint32_t Index) const { 1248 return Index < Symbols.size() && Symbols[Index].isTypeTable(); 1249 } 1250 1251 bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { 1252 return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); 1253 } 1254 1255 bool WasmObjectFile::isValidEventSymbol(uint32_t Index) const { 1256 return Index < Symbols.size() && Symbols[Index].isTypeEvent(); 1257 } 1258 1259 bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { 1260 return Index < Symbols.size() && Symbols[Index].isTypeData(); 1261 } 1262 1263 bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { 1264 return Index < Symbols.size() && Symbols[Index].isTypeSection(); 1265 } 1266 1267 wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { 1268 assert(isDefinedFunctionIndex(Index)); 1269 return Functions[Index - NumImportedFunctions]; 1270 } 1271 1272 const wasm::WasmFunction & 1273 WasmObjectFile::getDefinedFunction(uint32_t Index) const { 1274 assert(isDefinedFunctionIndex(Index)); 1275 return Functions[Index - NumImportedFunctions]; 1276 } 1277 1278 wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) { 1279 assert(isDefinedGlobalIndex(Index)); 1280 return Globals[Index - NumImportedGlobals]; 1281 } 1282 1283 wasm::WasmEvent &WasmObjectFile::getDefinedEvent(uint32_t Index) { 1284 assert(isDefinedEventIndex(Index)); 1285 return Events[Index - NumImportedEvents]; 1286 } 1287 1288 Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { 1289 StartFunction = readVaruint32(Ctx); 1290 if (!isValidFunctionIndex(StartFunction)) 1291 return make_error<GenericBinaryError>("invalid start function", 1292 object_error::parse_failed); 1293 return Error::success(); 1294 } 1295 1296 Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { 1297 SeenCodeSection = true; 1298 CodeSection = Sections.size(); 1299 uint32_t FunctionCount = readVaruint32(Ctx); 1300 if (FunctionCount != FunctionTypes.size()) { 1301 return make_error<GenericBinaryError>("invalid function count", 1302 object_error::parse_failed); 1303 } 1304 1305 for (uint32_t i = 0; i < FunctionCount; i++) { 1306 wasm::WasmFunction& Function = Functions[i]; 1307 const uint8_t *FunctionStart = Ctx.Ptr; 1308 uint32_t Size = readVaruint32(Ctx); 1309 const uint8_t *FunctionEnd = Ctx.Ptr + Size; 1310 1311 Function.CodeOffset = Ctx.Ptr - FunctionStart; 1312 Function.Index = NumImportedFunctions + i; 1313 Function.CodeSectionOffset = FunctionStart - Ctx.Start; 1314 Function.Size = FunctionEnd - FunctionStart; 1315 1316 uint32_t NumLocalDecls = readVaruint32(Ctx); 1317 Function.Locals.reserve(NumLocalDecls); 1318 while (NumLocalDecls--) { 1319 wasm::WasmLocalDecl Decl; 1320 Decl.Count = readVaruint32(Ctx); 1321 Decl.Type = readUint8(Ctx); 1322 Function.Locals.push_back(Decl); 1323 } 1324 1325 uint32_t BodySize = FunctionEnd - Ctx.Ptr; 1326 Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); 1327 // This will be set later when reading in the linking metadata section. 1328 Function.Comdat = UINT32_MAX; 1329 Ctx.Ptr += BodySize; 1330 assert(Ctx.Ptr == FunctionEnd); 1331 } 1332 if (Ctx.Ptr != Ctx.End) 1333 return make_error<GenericBinaryError>("code section ended prematurely", 1334 object_error::parse_failed); 1335 return Error::success(); 1336 } 1337 1338 Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { 1339 uint32_t Count = readVaruint32(Ctx); 1340 ElemSegments.reserve(Count); 1341 while (Count--) { 1342 wasm::WasmElemSegment Segment; 1343 Segment.TableIndex = readVaruint32(Ctx); 1344 if (Segment.TableIndex != 0) { 1345 return make_error<GenericBinaryError>("invalid TableIndex", 1346 object_error::parse_failed); 1347 } 1348 if (Error Err = readInitExpr(Segment.Offset, Ctx)) 1349 return Err; 1350 uint32_t NumElems = readVaruint32(Ctx); 1351 while (NumElems--) { 1352 Segment.Functions.push_back(readVaruint32(Ctx)); 1353 } 1354 ElemSegments.push_back(Segment); 1355 } 1356 if (Ctx.Ptr != Ctx.End) 1357 return make_error<GenericBinaryError>("elem section ended prematurely", 1358 object_error::parse_failed); 1359 return Error::success(); 1360 } 1361 1362 Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { 1363 DataSection = Sections.size(); 1364 uint32_t Count = readVaruint32(Ctx); 1365 if (DataCount && Count != DataCount.getValue()) 1366 return make_error<GenericBinaryError>( 1367 "number of data segments does not match DataCount section"); 1368 DataSegments.reserve(Count); 1369 while (Count--) { 1370 WasmSegment Segment; 1371 Segment.Data.InitFlags = readVaruint32(Ctx); 1372 Segment.Data.MemoryIndex = 1373 (Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_HAS_MEMINDEX) 1374 ? readVaruint32(Ctx) 1375 : 0; 1376 if ((Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_IS_PASSIVE) == 0) { 1377 if (Error Err = readInitExpr(Segment.Data.Offset, Ctx)) 1378 return Err; 1379 } else { 1380 Segment.Data.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST; 1381 Segment.Data.Offset.Value.Int32 = 0; 1382 } 1383 uint32_t Size = readVaruint32(Ctx); 1384 if (Size > (size_t)(Ctx.End - Ctx.Ptr)) 1385 return make_error<GenericBinaryError>("invalid segment size", 1386 object_error::parse_failed); 1387 Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 1388 // The rest of these Data fields are set later, when reading in the linking 1389 // metadata section. 1390 Segment.Data.Alignment = 0; 1391 Segment.Data.LinkerFlags = 0; 1392 Segment.Data.Comdat = UINT32_MAX; 1393 Segment.SectionOffset = Ctx.Ptr - Ctx.Start; 1394 Ctx.Ptr += Size; 1395 DataSegments.push_back(Segment); 1396 } 1397 if (Ctx.Ptr != Ctx.End) 1398 return make_error<GenericBinaryError>("data section ended prematurely", 1399 object_error::parse_failed); 1400 return Error::success(); 1401 } 1402 1403 Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) { 1404 DataCount = readVaruint32(Ctx); 1405 return Error::success(); 1406 } 1407 1408 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { 1409 return Header; 1410 } 1411 1412 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; } 1413 1414 Expected<uint32_t> WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { 1415 uint32_t Result = SymbolRef::SF_None; 1416 const WasmSymbol &Sym = getWasmSymbol(Symb); 1417 1418 LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); 1419 if (Sym.isBindingWeak()) 1420 Result |= SymbolRef::SF_Weak; 1421 if (!Sym.isBindingLocal()) 1422 Result |= SymbolRef::SF_Global; 1423 if (Sym.isHidden()) 1424 Result |= SymbolRef::SF_Hidden; 1425 if (!Sym.isDefined()) 1426 Result |= SymbolRef::SF_Undefined; 1427 if (Sym.isTypeFunction()) 1428 Result |= SymbolRef::SF_Executable; 1429 return Result; 1430 } 1431 1432 basic_symbol_iterator WasmObjectFile::symbol_begin() const { 1433 DataRefImpl Ref; 1434 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1435 Ref.d.b = 0; // Symbol index 1436 return BasicSymbolRef(Ref, this); 1437 } 1438 1439 basic_symbol_iterator WasmObjectFile::symbol_end() const { 1440 DataRefImpl Ref; 1441 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1442 Ref.d.b = Symbols.size(); // Symbol index 1443 return BasicSymbolRef(Ref, this); 1444 } 1445 1446 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { 1447 return Symbols[Symb.d.b]; 1448 } 1449 1450 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { 1451 return getWasmSymbol(Symb.getRawDataRefImpl()); 1452 } 1453 1454 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { 1455 return getWasmSymbol(Symb).Info.Name; 1456 } 1457 1458 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { 1459 auto &Sym = getWasmSymbol(Symb); 1460 if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION && 1461 isDefinedFunctionIndex(Sym.Info.ElementIndex)) 1462 return getDefinedFunction(Sym.Info.ElementIndex).CodeSectionOffset; 1463 else 1464 return getSymbolValue(Symb); 1465 } 1466 1467 uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const { 1468 switch (Sym.Info.Kind) { 1469 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1470 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1471 case wasm::WASM_SYMBOL_TYPE_EVENT: 1472 case wasm::WASM_SYMBOL_TYPE_TABLE: 1473 return Sym.Info.ElementIndex; 1474 case wasm::WASM_SYMBOL_TYPE_DATA: { 1475 // The value of a data symbol is the segment offset, plus the symbol 1476 // offset within the segment. 1477 uint32_t SegmentIndex = Sym.Info.DataRef.Segment; 1478 const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; 1479 if (Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST) { 1480 return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset; 1481 } else if (Segment.Offset.Opcode == wasm::WASM_OPCODE_I64_CONST) { 1482 return Segment.Offset.Value.Int64 + Sym.Info.DataRef.Offset; 1483 } else { 1484 llvm_unreachable("unknown init expr opcode"); 1485 } 1486 } 1487 case wasm::WASM_SYMBOL_TYPE_SECTION: 1488 return 0; 1489 } 1490 llvm_unreachable("invalid symbol type"); 1491 } 1492 1493 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { 1494 return getWasmSymbolValue(getWasmSymbol(Symb)); 1495 } 1496 1497 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { 1498 llvm_unreachable("not yet implemented"); 1499 return 0; 1500 } 1501 1502 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { 1503 llvm_unreachable("not yet implemented"); 1504 return 0; 1505 } 1506 1507 Expected<SymbolRef::Type> 1508 WasmObjectFile::getSymbolType(DataRefImpl Symb) const { 1509 const WasmSymbol &Sym = getWasmSymbol(Symb); 1510 1511 switch (Sym.Info.Kind) { 1512 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1513 return SymbolRef::ST_Function; 1514 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1515 return SymbolRef::ST_Other; 1516 case wasm::WASM_SYMBOL_TYPE_DATA: 1517 return SymbolRef::ST_Data; 1518 case wasm::WASM_SYMBOL_TYPE_SECTION: 1519 return SymbolRef::ST_Debug; 1520 case wasm::WASM_SYMBOL_TYPE_EVENT: 1521 return SymbolRef::ST_Other; 1522 case wasm::WASM_SYMBOL_TYPE_TABLE: 1523 return SymbolRef::ST_Other; 1524 } 1525 1526 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1527 return SymbolRef::ST_Other; 1528 } 1529 1530 Expected<section_iterator> 1531 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { 1532 const WasmSymbol &Sym = getWasmSymbol(Symb); 1533 if (Sym.isUndefined()) 1534 return section_end(); 1535 1536 DataRefImpl Ref; 1537 Ref.d.a = getSymbolSectionIdImpl(Sym); 1538 return section_iterator(SectionRef(Ref, this)); 1539 } 1540 1541 uint32_t WasmObjectFile::getSymbolSectionId(SymbolRef Symb) const { 1542 const WasmSymbol &Sym = getWasmSymbol(Symb); 1543 return getSymbolSectionIdImpl(Sym); 1544 } 1545 1546 uint32_t WasmObjectFile::getSymbolSectionIdImpl(const WasmSymbol &Sym) const { 1547 switch (Sym.Info.Kind) { 1548 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1549 return CodeSection; 1550 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1551 return GlobalSection; 1552 case wasm::WASM_SYMBOL_TYPE_DATA: 1553 return DataSection; 1554 case wasm::WASM_SYMBOL_TYPE_SECTION: 1555 return Sym.Info.ElementIndex; 1556 case wasm::WASM_SYMBOL_TYPE_EVENT: 1557 return EventSection; 1558 case wasm::WASM_SYMBOL_TYPE_TABLE: 1559 return TableSection; 1560 default: 1561 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1562 } 1563 } 1564 1565 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } 1566 1567 Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const { 1568 const WasmSection &S = Sections[Sec.d.a]; 1569 #define ECase(X) \ 1570 case wasm::WASM_SEC_##X: \ 1571 return #X; 1572 switch (S.Type) { 1573 ECase(TYPE); 1574 ECase(IMPORT); 1575 ECase(FUNCTION); 1576 ECase(TABLE); 1577 ECase(MEMORY); 1578 ECase(GLOBAL); 1579 ECase(EVENT); 1580 ECase(EXPORT); 1581 ECase(START); 1582 ECase(ELEM); 1583 ECase(CODE); 1584 ECase(DATA); 1585 ECase(DATACOUNT); 1586 case wasm::WASM_SEC_CUSTOM: 1587 return S.Name; 1588 default: 1589 return createStringError(object_error::invalid_section_index, ""); 1590 } 1591 #undef ECase 1592 } 1593 1594 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; } 1595 1596 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { 1597 return Sec.d.a; 1598 } 1599 1600 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { 1601 const WasmSection &S = Sections[Sec.d.a]; 1602 return S.Content.size(); 1603 } 1604 1605 Expected<ArrayRef<uint8_t>> 1606 WasmObjectFile::getSectionContents(DataRefImpl Sec) const { 1607 const WasmSection &S = Sections[Sec.d.a]; 1608 // This will never fail since wasm sections can never be empty (user-sections 1609 // must have a name and non-user sections each have a defined structure). 1610 return S.Content; 1611 } 1612 1613 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { 1614 return 1; 1615 } 1616 1617 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { 1618 return false; 1619 } 1620 1621 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { 1622 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE; 1623 } 1624 1625 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { 1626 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA; 1627 } 1628 1629 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } 1630 1631 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } 1632 1633 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { 1634 DataRefImpl RelocRef; 1635 RelocRef.d.a = Ref.d.a; 1636 RelocRef.d.b = 0; 1637 return relocation_iterator(RelocationRef(RelocRef, this)); 1638 } 1639 1640 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { 1641 const WasmSection &Sec = getWasmSection(Ref); 1642 DataRefImpl RelocRef; 1643 RelocRef.d.a = Ref.d.a; 1644 RelocRef.d.b = Sec.Relocations.size(); 1645 return relocation_iterator(RelocationRef(RelocRef, this)); 1646 } 1647 1648 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { Rel.d.b++; } 1649 1650 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { 1651 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1652 return Rel.Offset; 1653 } 1654 1655 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { 1656 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1657 if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB) 1658 return symbol_end(); 1659 DataRefImpl Sym; 1660 Sym.d.a = 1; 1661 Sym.d.b = Rel.Index; 1662 return symbol_iterator(SymbolRef(Sym, this)); 1663 } 1664 1665 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { 1666 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1667 return Rel.Type; 1668 } 1669 1670 void WasmObjectFile::getRelocationTypeName( 1671 DataRefImpl Ref, SmallVectorImpl<char> &Result) const { 1672 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1673 StringRef Res = "Unknown"; 1674 1675 #define WASM_RELOC(name, value) \ 1676 case wasm::name: \ 1677 Res = #name; \ 1678 break; 1679 1680 switch (Rel.Type) { 1681 #include "llvm/BinaryFormat/WasmRelocs.def" 1682 } 1683 1684 #undef WASM_RELOC 1685 1686 Result.append(Res.begin(), Res.end()); 1687 } 1688 1689 section_iterator WasmObjectFile::section_begin() const { 1690 DataRefImpl Ref; 1691 Ref.d.a = 0; 1692 return section_iterator(SectionRef(Ref, this)); 1693 } 1694 1695 section_iterator WasmObjectFile::section_end() const { 1696 DataRefImpl Ref; 1697 Ref.d.a = Sections.size(); 1698 return section_iterator(SectionRef(Ref, this)); 1699 } 1700 1701 uint8_t WasmObjectFile::getBytesInAddress() const { 1702 return HasMemory64 ? 8 : 4; 1703 } 1704 1705 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } 1706 1707 Triple::ArchType WasmObjectFile::getArch() const { 1708 return HasMemory64 ? Triple::wasm64 : Triple::wasm32; 1709 } 1710 1711 SubtargetFeatures WasmObjectFile::getFeatures() const { 1712 return SubtargetFeatures(); 1713 } 1714 1715 bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; } 1716 1717 bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; } 1718 1719 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { 1720 assert(Ref.d.a < Sections.size()); 1721 return Sections[Ref.d.a]; 1722 } 1723 1724 const WasmSection & 1725 WasmObjectFile::getWasmSection(const SectionRef &Section) const { 1726 return getWasmSection(Section.getRawDataRefImpl()); 1727 } 1728 1729 const wasm::WasmRelocation & 1730 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { 1731 return getWasmRelocation(Ref.getRawDataRefImpl()); 1732 } 1733 1734 const wasm::WasmRelocation & 1735 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { 1736 assert(Ref.d.a < Sections.size()); 1737 const WasmSection &Sec = Sections[Ref.d.a]; 1738 assert(Ref.d.b < Sec.Relocations.size()); 1739 return Sec.Relocations[Ref.d.b]; 1740 } 1741 1742 int WasmSectionOrderChecker::getSectionOrder(unsigned ID, 1743 StringRef CustomSectionName) { 1744 switch (ID) { 1745 case wasm::WASM_SEC_CUSTOM: 1746 return StringSwitch<unsigned>(CustomSectionName) 1747 .Case("dylink", WASM_SEC_ORDER_DYLINK) 1748 .Case("linking", WASM_SEC_ORDER_LINKING) 1749 .StartsWith("reloc.", WASM_SEC_ORDER_RELOC) 1750 .Case("name", WASM_SEC_ORDER_NAME) 1751 .Case("producers", WASM_SEC_ORDER_PRODUCERS) 1752 .Case("target_features", WASM_SEC_ORDER_TARGET_FEATURES) 1753 .Default(WASM_SEC_ORDER_NONE); 1754 case wasm::WASM_SEC_TYPE: 1755 return WASM_SEC_ORDER_TYPE; 1756 case wasm::WASM_SEC_IMPORT: 1757 return WASM_SEC_ORDER_IMPORT; 1758 case wasm::WASM_SEC_FUNCTION: 1759 return WASM_SEC_ORDER_FUNCTION; 1760 case wasm::WASM_SEC_TABLE: 1761 return WASM_SEC_ORDER_TABLE; 1762 case wasm::WASM_SEC_MEMORY: 1763 return WASM_SEC_ORDER_MEMORY; 1764 case wasm::WASM_SEC_GLOBAL: 1765 return WASM_SEC_ORDER_GLOBAL; 1766 case wasm::WASM_SEC_EXPORT: 1767 return WASM_SEC_ORDER_EXPORT; 1768 case wasm::WASM_SEC_START: 1769 return WASM_SEC_ORDER_START; 1770 case wasm::WASM_SEC_ELEM: 1771 return WASM_SEC_ORDER_ELEM; 1772 case wasm::WASM_SEC_CODE: 1773 return WASM_SEC_ORDER_CODE; 1774 case wasm::WASM_SEC_DATA: 1775 return WASM_SEC_ORDER_DATA; 1776 case wasm::WASM_SEC_DATACOUNT: 1777 return WASM_SEC_ORDER_DATACOUNT; 1778 case wasm::WASM_SEC_EVENT: 1779 return WASM_SEC_ORDER_EVENT; 1780 default: 1781 return WASM_SEC_ORDER_NONE; 1782 } 1783 } 1784 1785 // Represents the edges in a directed graph where any node B reachable from node 1786 // A is not allowed to appear before A in the section ordering, but may appear 1787 // afterward. 1788 int WasmSectionOrderChecker::DisallowedPredecessors 1789 [WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = { 1790 // WASM_SEC_ORDER_NONE 1791 {}, 1792 // WASM_SEC_ORDER_TYPE 1793 {WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, 1794 // WASM_SEC_ORDER_IMPORT 1795 {WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, 1796 // WASM_SEC_ORDER_FUNCTION 1797 {WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, 1798 // WASM_SEC_ORDER_TABLE 1799 {WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, 1800 // WASM_SEC_ORDER_MEMORY 1801 {WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_EVENT}, 1802 // WASM_SEC_ORDER_EVENT 1803 {WASM_SEC_ORDER_EVENT, WASM_SEC_ORDER_GLOBAL}, 1804 // WASM_SEC_ORDER_GLOBAL 1805 {WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EXPORT}, 1806 // WASM_SEC_ORDER_EXPORT 1807 {WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, 1808 // WASM_SEC_ORDER_START 1809 {WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, 1810 // WASM_SEC_ORDER_ELEM 1811 {WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, 1812 // WASM_SEC_ORDER_DATACOUNT 1813 {WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, 1814 // WASM_SEC_ORDER_CODE 1815 {WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, 1816 // WASM_SEC_ORDER_DATA 1817 {WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, 1818 1819 // Custom Sections 1820 // WASM_SEC_ORDER_DYLINK 1821 {WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, 1822 // WASM_SEC_ORDER_LINKING 1823 {WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, 1824 // WASM_SEC_ORDER_RELOC (can be repeated) 1825 {}, 1826 // WASM_SEC_ORDER_NAME 1827 {WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, 1828 // WASM_SEC_ORDER_PRODUCERS 1829 {WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, 1830 // WASM_SEC_ORDER_TARGET_FEATURES 1831 {WASM_SEC_ORDER_TARGET_FEATURES}}; 1832 1833 bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID, 1834 StringRef CustomSectionName) { 1835 int Order = getSectionOrder(ID, CustomSectionName); 1836 if (Order == WASM_SEC_ORDER_NONE) 1837 return true; 1838 1839 // Disallowed predecessors we need to check for 1840 SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList; 1841 1842 // Keep track of completed checks to avoid repeating work 1843 bool Checked[WASM_NUM_SEC_ORDERS] = {}; 1844 1845 int Curr = Order; 1846 while (true) { 1847 // Add new disallowed predecessors to work list 1848 for (size_t I = 0;; ++I) { 1849 int Next = DisallowedPredecessors[Curr][I]; 1850 if (Next == WASM_SEC_ORDER_NONE) 1851 break; 1852 if (Checked[Next]) 1853 continue; 1854 WorkList.push_back(Next); 1855 Checked[Next] = true; 1856 } 1857 1858 if (WorkList.empty()) 1859 break; 1860 1861 // Consider next disallowed predecessor 1862 Curr = WorkList.pop_back_val(); 1863 if (Seen[Curr]) 1864 return false; 1865 } 1866 1867 // Have not seen any disallowed predecessors 1868 Seen[Order] = true; 1869 return true; 1870 } 1871