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 WasmSectionOrderChecker Checker; 290 while (Ctx.Ptr < Ctx.End) { 291 WasmSection Sec; 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_TAG: 320 return parseTagSection(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 // Legacy "dylink" section support. 343 // See parseDylink0Section for the current "dylink.0" section parsing. 344 HasDylinkSection = true; 345 DylinkInfo.MemorySize = readVaruint32(Ctx); 346 DylinkInfo.MemoryAlignment = readVaruint32(Ctx); 347 DylinkInfo.TableSize = readVaruint32(Ctx); 348 DylinkInfo.TableAlignment = readVaruint32(Ctx); 349 uint32_t Count = readVaruint32(Ctx); 350 while (Count--) { 351 DylinkInfo.Needed.push_back(readString(Ctx)); 352 } 353 354 if (Ctx.Ptr != Ctx.End) 355 return make_error<GenericBinaryError>("dylink section ended prematurely", 356 object_error::parse_failed); 357 return Error::success(); 358 } 359 360 Error WasmObjectFile::parseDylink0Section(ReadContext &Ctx) { 361 // See 362 // https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md 363 HasDylinkSection = true; 364 365 const uint8_t *OrigEnd = Ctx.End; 366 while (Ctx.Ptr < OrigEnd) { 367 Ctx.End = OrigEnd; 368 uint8_t Type = readUint8(Ctx); 369 uint32_t Size = readVaruint32(Ctx); 370 LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size 371 << "\n"); 372 Ctx.End = Ctx.Ptr + Size; 373 uint32_t Count; 374 switch (Type) { 375 case wasm::WASM_DYLINK_MEM_INFO: 376 DylinkInfo.MemorySize = readVaruint32(Ctx); 377 DylinkInfo.MemoryAlignment = readVaruint32(Ctx); 378 DylinkInfo.TableSize = readVaruint32(Ctx); 379 DylinkInfo.TableAlignment = readVaruint32(Ctx); 380 break; 381 case wasm::WASM_DYLINK_NEEDED: 382 Count = readVaruint32(Ctx); 383 while (Count--) { 384 DylinkInfo.Needed.push_back(readString(Ctx)); 385 } 386 break; 387 case wasm::WASM_DYLINK_EXPORT_INFO: { 388 uint32_t Count = readVaruint32(Ctx); 389 while (Count--) { 390 DylinkInfo.ExportInfo.push_back({readString(Ctx), readVaruint32(Ctx)}); 391 } 392 break; 393 } 394 default: 395 LLVM_DEBUG(dbgs() << "unknown dylink.0 sub-section: " << Type << "\n"); 396 Ctx.Ptr += Size; 397 break; 398 } 399 if (Ctx.Ptr != Ctx.End) { 400 return make_error<GenericBinaryError>( 401 "dylink.0 sub-section ended prematurely", object_error::parse_failed); 402 } 403 } 404 405 if (Ctx.Ptr != Ctx.End) 406 return make_error<GenericBinaryError>("dylink.0 section ended prematurely", 407 object_error::parse_failed); 408 return Error::success(); 409 } 410 411 Error WasmObjectFile::parseNameSection(ReadContext &Ctx) { 412 llvm::DenseSet<uint64_t> SeenFunctions; 413 llvm::DenseSet<uint64_t> SeenGlobals; 414 llvm::DenseSet<uint64_t> SeenSegments; 415 if (Functions.size() && !SeenCodeSection) { 416 return make_error<GenericBinaryError>("names must come after code section", 417 object_error::parse_failed); 418 } 419 420 while (Ctx.Ptr < Ctx.End) { 421 uint8_t Type = readUint8(Ctx); 422 uint32_t Size = readVaruint32(Ctx); 423 const uint8_t *SubSectionEnd = Ctx.Ptr + Size; 424 switch (Type) { 425 case wasm::WASM_NAMES_FUNCTION: 426 case wasm::WASM_NAMES_GLOBAL: 427 case wasm::WASM_NAMES_DATA_SEGMENT: { 428 uint32_t Count = readVaruint32(Ctx); 429 while (Count--) { 430 uint32_t Index = readVaruint32(Ctx); 431 StringRef Name = readString(Ctx); 432 wasm::NameType nameType = wasm::NameType::FUNCTION; 433 if (Type == wasm::WASM_NAMES_FUNCTION) { 434 if (!SeenFunctions.insert(Index).second) 435 return make_error<GenericBinaryError>( 436 "function named more than once", object_error::parse_failed); 437 if (!isValidFunctionIndex(Index) || Name.empty()) 438 return make_error<GenericBinaryError>("invalid name entry", 439 object_error::parse_failed); 440 441 if (isDefinedFunctionIndex(Index)) 442 getDefinedFunction(Index).DebugName = Name; 443 } else if (Type == wasm::WASM_NAMES_GLOBAL) { 444 nameType = wasm::NameType::GLOBAL; 445 if (!SeenGlobals.insert(Index).second) 446 return make_error<GenericBinaryError>("global named more than once", 447 object_error::parse_failed); 448 if (!isValidGlobalIndex(Index) || Name.empty()) 449 return make_error<GenericBinaryError>("invalid name entry", 450 object_error::parse_failed); 451 } else { 452 nameType = wasm::NameType::DATA_SEGMENT; 453 if (!SeenSegments.insert(Index).second) 454 return make_error<GenericBinaryError>( 455 "segment named more than once", object_error::parse_failed); 456 if (Index > DataSegments.size()) 457 return make_error<GenericBinaryError>("invalid named data segment", 458 object_error::parse_failed); 459 } 460 DebugNames.push_back(wasm::WasmDebugName{nameType, Index, Name}); 461 } 462 break; 463 } 464 // Ignore local names for now 465 case wasm::WASM_NAMES_LOCAL: 466 default: 467 Ctx.Ptr += Size; 468 break; 469 } 470 if (Ctx.Ptr != SubSectionEnd) 471 return make_error<GenericBinaryError>( 472 "name sub-section ended prematurely", object_error::parse_failed); 473 } 474 475 if (Ctx.Ptr != Ctx.End) 476 return make_error<GenericBinaryError>("name section ended prematurely", 477 object_error::parse_failed); 478 return Error::success(); 479 } 480 481 Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) { 482 HasLinkingSection = true; 483 if (Functions.size() && !SeenCodeSection) { 484 return make_error<GenericBinaryError>( 485 "linking data must come after code section", 486 object_error::parse_failed); 487 } 488 489 LinkingData.Version = readVaruint32(Ctx); 490 if (LinkingData.Version != wasm::WasmMetadataVersion) { 491 return make_error<GenericBinaryError>( 492 "unexpected metadata version: " + Twine(LinkingData.Version) + 493 " (Expected: " + Twine(wasm::WasmMetadataVersion) + ")", 494 object_error::parse_failed); 495 } 496 497 const uint8_t *OrigEnd = Ctx.End; 498 while (Ctx.Ptr < OrigEnd) { 499 Ctx.End = OrigEnd; 500 uint8_t Type = readUint8(Ctx); 501 uint32_t Size = readVaruint32(Ctx); 502 LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size 503 << "\n"); 504 Ctx.End = Ctx.Ptr + Size; 505 switch (Type) { 506 case wasm::WASM_SYMBOL_TABLE: 507 if (Error Err = parseLinkingSectionSymtab(Ctx)) 508 return Err; 509 break; 510 case wasm::WASM_SEGMENT_INFO: { 511 uint32_t Count = readVaruint32(Ctx); 512 if (Count > DataSegments.size()) 513 return make_error<GenericBinaryError>("too many segment names", 514 object_error::parse_failed); 515 for (uint32_t I = 0; I < Count; I++) { 516 DataSegments[I].Data.Name = readString(Ctx); 517 DataSegments[I].Data.Alignment = readVaruint32(Ctx); 518 DataSegments[I].Data.LinkingFlags = readVaruint32(Ctx); 519 } 520 break; 521 } 522 case wasm::WASM_INIT_FUNCS: { 523 uint32_t Count = readVaruint32(Ctx); 524 LinkingData.InitFunctions.reserve(Count); 525 for (uint32_t I = 0; I < Count; I++) { 526 wasm::WasmInitFunc Init; 527 Init.Priority = readVaruint32(Ctx); 528 Init.Symbol = readVaruint32(Ctx); 529 if (!isValidFunctionSymbol(Init.Symbol)) 530 return make_error<GenericBinaryError>("invalid function symbol: " + 531 Twine(Init.Symbol), 532 object_error::parse_failed); 533 LinkingData.InitFunctions.emplace_back(Init); 534 } 535 break; 536 } 537 case wasm::WASM_COMDAT_INFO: 538 if (Error Err = parseLinkingSectionComdat(Ctx)) 539 return Err; 540 break; 541 default: 542 Ctx.Ptr += Size; 543 break; 544 } 545 if (Ctx.Ptr != Ctx.End) 546 return make_error<GenericBinaryError>( 547 "linking sub-section ended prematurely", object_error::parse_failed); 548 } 549 if (Ctx.Ptr != OrigEnd) 550 return make_error<GenericBinaryError>("linking section ended prematurely", 551 object_error::parse_failed); 552 return Error::success(); 553 } 554 555 Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) { 556 uint32_t Count = readVaruint32(Ctx); 557 LinkingData.SymbolTable.reserve(Count); 558 Symbols.reserve(Count); 559 StringSet<> SymbolNames; 560 561 std::vector<wasm::WasmImport *> ImportedGlobals; 562 std::vector<wasm::WasmImport *> ImportedFunctions; 563 std::vector<wasm::WasmImport *> ImportedTags; 564 std::vector<wasm::WasmImport *> ImportedTables; 565 ImportedGlobals.reserve(Imports.size()); 566 ImportedFunctions.reserve(Imports.size()); 567 ImportedTags.reserve(Imports.size()); 568 ImportedTables.reserve(Imports.size()); 569 for (auto &I : Imports) { 570 if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION) 571 ImportedFunctions.emplace_back(&I); 572 else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL) 573 ImportedGlobals.emplace_back(&I); 574 else if (I.Kind == wasm::WASM_EXTERNAL_TAG) 575 ImportedTags.emplace_back(&I); 576 else if (I.Kind == wasm::WASM_EXTERNAL_TABLE) 577 ImportedTables.emplace_back(&I); 578 } 579 580 while (Count--) { 581 wasm::WasmSymbolInfo Info; 582 const wasm::WasmSignature *Signature = nullptr; 583 const wasm::WasmGlobalType *GlobalType = nullptr; 584 const wasm::WasmTableType *TableType = nullptr; 585 586 Info.Kind = readUint8(Ctx); 587 Info.Flags = readVaruint32(Ctx); 588 bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0; 589 590 switch (Info.Kind) { 591 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 592 Info.ElementIndex = readVaruint32(Ctx); 593 if (!isValidFunctionIndex(Info.ElementIndex) || 594 IsDefined != isDefinedFunctionIndex(Info.ElementIndex)) 595 return make_error<GenericBinaryError>("invalid function symbol index", 596 object_error::parse_failed); 597 if (IsDefined) { 598 Info.Name = readString(Ctx); 599 unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; 600 wasm::WasmFunction &Function = Functions[FuncIndex]; 601 Signature = &Signatures[Function.SigIndex]; 602 if (Function.SymbolName.empty()) 603 Function.SymbolName = Info.Name; 604 } else { 605 wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex]; 606 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 607 Info.Name = readString(Ctx); 608 Info.ImportName = Import.Field; 609 } else { 610 Info.Name = Import.Field; 611 } 612 Signature = &Signatures[Import.SigIndex]; 613 if (!Import.Module.empty()) { 614 Info.ImportModule = Import.Module; 615 } 616 } 617 break; 618 619 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 620 Info.ElementIndex = readVaruint32(Ctx); 621 if (!isValidGlobalIndex(Info.ElementIndex) || 622 IsDefined != isDefinedGlobalIndex(Info.ElementIndex)) 623 return make_error<GenericBinaryError>("invalid global symbol index", 624 object_error::parse_failed); 625 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 626 wasm::WASM_SYMBOL_BINDING_WEAK) 627 return make_error<GenericBinaryError>("undefined weak global symbol", 628 object_error::parse_failed); 629 if (IsDefined) { 630 Info.Name = readString(Ctx); 631 unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals; 632 wasm::WasmGlobal &Global = Globals[GlobalIndex]; 633 GlobalType = &Global.Type; 634 if (Global.SymbolName.empty()) 635 Global.SymbolName = Info.Name; 636 } else { 637 wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex]; 638 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 639 Info.Name = readString(Ctx); 640 Info.ImportName = Import.Field; 641 } else { 642 Info.Name = Import.Field; 643 } 644 GlobalType = &Import.Global; 645 if (!Import.Module.empty()) { 646 Info.ImportModule = Import.Module; 647 } 648 } 649 break; 650 651 case wasm::WASM_SYMBOL_TYPE_TABLE: 652 Info.ElementIndex = readVaruint32(Ctx); 653 if (!isValidTableNumber(Info.ElementIndex) || 654 IsDefined != isDefinedTableNumber(Info.ElementIndex)) 655 return make_error<GenericBinaryError>("invalid table symbol index", 656 object_error::parse_failed); 657 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 658 wasm::WASM_SYMBOL_BINDING_WEAK) 659 return make_error<GenericBinaryError>("undefined weak table symbol", 660 object_error::parse_failed); 661 if (IsDefined) { 662 Info.Name = readString(Ctx); 663 unsigned TableNumber = Info.ElementIndex - NumImportedTables; 664 wasm::WasmTable &Table = Tables[TableNumber]; 665 TableType = &Table.Type; 666 if (Table.SymbolName.empty()) 667 Table.SymbolName = Info.Name; 668 } else { 669 wasm::WasmImport &Import = *ImportedTables[Info.ElementIndex]; 670 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 671 Info.Name = readString(Ctx); 672 Info.ImportName = Import.Field; 673 } else { 674 Info.Name = Import.Field; 675 } 676 TableType = &Import.Table; 677 if (!Import.Module.empty()) { 678 Info.ImportModule = Import.Module; 679 } 680 } 681 break; 682 683 case wasm::WASM_SYMBOL_TYPE_DATA: 684 Info.Name = readString(Ctx); 685 if (IsDefined) { 686 auto Index = readVaruint32(Ctx); 687 if (Index >= DataSegments.size()) 688 return make_error<GenericBinaryError>("invalid data symbol index", 689 object_error::parse_failed); 690 auto Offset = readVaruint64(Ctx); 691 auto Size = readVaruint64(Ctx); 692 size_t SegmentSize = DataSegments[Index].Data.Content.size(); 693 if (Offset > SegmentSize) 694 return make_error<GenericBinaryError>( 695 "invalid data symbol offset: `" + Info.Name + "` (offset: " + 696 Twine(Offset) + " segment size: " + Twine(SegmentSize) + ")", 697 object_error::parse_failed); 698 Info.DataRef = wasm::WasmDataReference{Index, Offset, Size}; 699 } 700 break; 701 702 case wasm::WASM_SYMBOL_TYPE_SECTION: { 703 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 704 wasm::WASM_SYMBOL_BINDING_LOCAL) 705 return make_error<GenericBinaryError>( 706 "section symbols must have local binding", 707 object_error::parse_failed); 708 Info.ElementIndex = readVaruint32(Ctx); 709 // Use somewhat unique section name as symbol name. 710 StringRef SectionName = Sections[Info.ElementIndex].Name; 711 Info.Name = SectionName; 712 break; 713 } 714 715 case wasm::WASM_SYMBOL_TYPE_TAG: { 716 Info.ElementIndex = readVaruint32(Ctx); 717 if (!isValidTagIndex(Info.ElementIndex) || 718 IsDefined != isDefinedTagIndex(Info.ElementIndex)) 719 return make_error<GenericBinaryError>("invalid tag symbol index", 720 object_error::parse_failed); 721 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 722 wasm::WASM_SYMBOL_BINDING_WEAK) 723 return make_error<GenericBinaryError>("undefined weak global symbol", 724 object_error::parse_failed); 725 if (IsDefined) { 726 Info.Name = readString(Ctx); 727 unsigned TagIndex = Info.ElementIndex - NumImportedTags; 728 wasm::WasmTag &Tag = Tags[TagIndex]; 729 Signature = &Signatures[Tag.SigIndex]; 730 if (Tag.SymbolName.empty()) 731 Tag.SymbolName = Info.Name; 732 733 } else { 734 wasm::WasmImport &Import = *ImportedTags[Info.ElementIndex]; 735 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 736 Info.Name = readString(Ctx); 737 Info.ImportName = Import.Field; 738 } else { 739 Info.Name = Import.Field; 740 } 741 Signature = &Signatures[Import.SigIndex]; 742 if (!Import.Module.empty()) { 743 Info.ImportModule = Import.Module; 744 } 745 } 746 break; 747 } 748 749 default: 750 return make_error<GenericBinaryError>("invalid symbol type: " + 751 Twine(unsigned(Info.Kind)), 752 object_error::parse_failed); 753 } 754 755 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 756 wasm::WASM_SYMBOL_BINDING_LOCAL && 757 !SymbolNames.insert(Info.Name).second) 758 return make_error<GenericBinaryError>("duplicate symbol name " + 759 Twine(Info.Name), 760 object_error::parse_failed); 761 LinkingData.SymbolTable.emplace_back(Info); 762 Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, TableType, 763 Signature); 764 LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n"); 765 } 766 767 return Error::success(); 768 } 769 770 Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { 771 uint32_t ComdatCount = readVaruint32(Ctx); 772 StringSet<> ComdatSet; 773 for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { 774 StringRef Name = readString(Ctx); 775 if (Name.empty() || !ComdatSet.insert(Name).second) 776 return make_error<GenericBinaryError>("bad/duplicate COMDAT name " + 777 Twine(Name), 778 object_error::parse_failed); 779 LinkingData.Comdats.emplace_back(Name); 780 uint32_t Flags = readVaruint32(Ctx); 781 if (Flags != 0) 782 return make_error<GenericBinaryError>("unsupported COMDAT flags", 783 object_error::parse_failed); 784 785 uint32_t EntryCount = readVaruint32(Ctx); 786 while (EntryCount--) { 787 unsigned Kind = readVaruint32(Ctx); 788 unsigned Index = readVaruint32(Ctx); 789 switch (Kind) { 790 default: 791 return make_error<GenericBinaryError>("invalid COMDAT entry type", 792 object_error::parse_failed); 793 case wasm::WASM_COMDAT_DATA: 794 if (Index >= DataSegments.size()) 795 return make_error<GenericBinaryError>( 796 "COMDAT data index out of range", object_error::parse_failed); 797 if (DataSegments[Index].Data.Comdat != UINT32_MAX) 798 return make_error<GenericBinaryError>("data segment in two COMDATs", 799 object_error::parse_failed); 800 DataSegments[Index].Data.Comdat = ComdatIndex; 801 break; 802 case wasm::WASM_COMDAT_FUNCTION: 803 if (!isDefinedFunctionIndex(Index)) 804 return make_error<GenericBinaryError>( 805 "COMDAT function index out of range", object_error::parse_failed); 806 if (getDefinedFunction(Index).Comdat != UINT32_MAX) 807 return make_error<GenericBinaryError>("function in two COMDATs", 808 object_error::parse_failed); 809 getDefinedFunction(Index).Comdat = ComdatIndex; 810 break; 811 case wasm::WASM_COMDAT_SECTION: 812 if (Index >= Sections.size()) 813 return make_error<GenericBinaryError>( 814 "COMDAT section index out of range", object_error::parse_failed); 815 if (Sections[Index].Type != wasm::WASM_SEC_CUSTOM) 816 return make_error<GenericBinaryError>( 817 "non-custom section in a COMDAT", object_error::parse_failed); 818 Sections[Index].Comdat = ComdatIndex; 819 break; 820 } 821 } 822 } 823 return Error::success(); 824 } 825 826 Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) { 827 llvm::SmallSet<StringRef, 3> FieldsSeen; 828 uint32_t Fields = readVaruint32(Ctx); 829 for (size_t I = 0; I < Fields; ++I) { 830 StringRef FieldName = readString(Ctx); 831 if (!FieldsSeen.insert(FieldName).second) 832 return make_error<GenericBinaryError>( 833 "producers section does not have unique fields", 834 object_error::parse_failed); 835 std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr; 836 if (FieldName == "language") { 837 ProducerVec = &ProducerInfo.Languages; 838 } else if (FieldName == "processed-by") { 839 ProducerVec = &ProducerInfo.Tools; 840 } else if (FieldName == "sdk") { 841 ProducerVec = &ProducerInfo.SDKs; 842 } else { 843 return make_error<GenericBinaryError>( 844 "producers section field is not named one of language, processed-by, " 845 "or sdk", 846 object_error::parse_failed); 847 } 848 uint32_t ValueCount = readVaruint32(Ctx); 849 llvm::SmallSet<StringRef, 8> ProducersSeen; 850 for (size_t J = 0; J < ValueCount; ++J) { 851 StringRef Name = readString(Ctx); 852 StringRef Version = readString(Ctx); 853 if (!ProducersSeen.insert(Name).second) { 854 return make_error<GenericBinaryError>( 855 "producers section contains repeated producer", 856 object_error::parse_failed); 857 } 858 ProducerVec->emplace_back(std::string(Name), std::string(Version)); 859 } 860 } 861 if (Ctx.Ptr != Ctx.End) 862 return make_error<GenericBinaryError>("producers section ended prematurely", 863 object_error::parse_failed); 864 return Error::success(); 865 } 866 867 Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) { 868 llvm::SmallSet<std::string, 8> FeaturesSeen; 869 uint32_t FeatureCount = readVaruint32(Ctx); 870 for (size_t I = 0; I < FeatureCount; ++I) { 871 wasm::WasmFeatureEntry Feature; 872 Feature.Prefix = readUint8(Ctx); 873 switch (Feature.Prefix) { 874 case wasm::WASM_FEATURE_PREFIX_USED: 875 case wasm::WASM_FEATURE_PREFIX_REQUIRED: 876 case wasm::WASM_FEATURE_PREFIX_DISALLOWED: 877 break; 878 default: 879 return make_error<GenericBinaryError>("unknown feature policy prefix", 880 object_error::parse_failed); 881 } 882 Feature.Name = std::string(readString(Ctx)); 883 if (!FeaturesSeen.insert(Feature.Name).second) 884 return make_error<GenericBinaryError>( 885 "target features section contains repeated feature \"" + 886 Feature.Name + "\"", 887 object_error::parse_failed); 888 TargetFeatures.push_back(Feature); 889 } 890 if (Ctx.Ptr != Ctx.End) 891 return make_error<GenericBinaryError>( 892 "target features section ended prematurely", 893 object_error::parse_failed); 894 return Error::success(); 895 } 896 897 Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { 898 uint32_t SectionIndex = readVaruint32(Ctx); 899 if (SectionIndex >= Sections.size()) 900 return make_error<GenericBinaryError>("invalid section index", 901 object_error::parse_failed); 902 WasmSection &Section = Sections[SectionIndex]; 903 uint32_t RelocCount = readVaruint32(Ctx); 904 uint32_t EndOffset = Section.Content.size(); 905 uint32_t PreviousOffset = 0; 906 while (RelocCount--) { 907 wasm::WasmRelocation Reloc = {}; 908 uint32_t type = readVaruint32(Ctx); 909 Reloc.Type = type; 910 Reloc.Offset = readVaruint32(Ctx); 911 if (Reloc.Offset < PreviousOffset) 912 return make_error<GenericBinaryError>("relocations not in offset order", 913 object_error::parse_failed); 914 PreviousOffset = Reloc.Offset; 915 Reloc.Index = readVaruint32(Ctx); 916 switch (type) { 917 case wasm::R_WASM_FUNCTION_INDEX_LEB: 918 case wasm::R_WASM_TABLE_INDEX_SLEB: 919 case wasm::R_WASM_TABLE_INDEX_SLEB64: 920 case wasm::R_WASM_TABLE_INDEX_I32: 921 case wasm::R_WASM_TABLE_INDEX_I64: 922 case wasm::R_WASM_TABLE_INDEX_REL_SLEB: 923 case wasm::R_WASM_TABLE_INDEX_REL_SLEB64: 924 if (!isValidFunctionSymbol(Reloc.Index)) 925 return make_error<GenericBinaryError>( 926 "invalid relocation function index", object_error::parse_failed); 927 break; 928 case wasm::R_WASM_TABLE_NUMBER_LEB: 929 if (!isValidTableSymbol(Reloc.Index)) 930 return make_error<GenericBinaryError>("invalid relocation table index", 931 object_error::parse_failed); 932 break; 933 case wasm::R_WASM_TYPE_INDEX_LEB: 934 if (Reloc.Index >= Signatures.size()) 935 return make_error<GenericBinaryError>("invalid relocation type index", 936 object_error::parse_failed); 937 break; 938 case wasm::R_WASM_GLOBAL_INDEX_LEB: 939 // R_WASM_GLOBAL_INDEX_LEB are can be used against function and data 940 // symbols to refer to their GOT entries. 941 if (!isValidGlobalSymbol(Reloc.Index) && 942 !isValidDataSymbol(Reloc.Index) && 943 !isValidFunctionSymbol(Reloc.Index)) 944 return make_error<GenericBinaryError>("invalid relocation global index", 945 object_error::parse_failed); 946 break; 947 case wasm::R_WASM_GLOBAL_INDEX_I32: 948 if (!isValidGlobalSymbol(Reloc.Index)) 949 return make_error<GenericBinaryError>("invalid relocation global index", 950 object_error::parse_failed); 951 break; 952 case wasm::R_WASM_TAG_INDEX_LEB: 953 if (!isValidTagSymbol(Reloc.Index)) 954 return make_error<GenericBinaryError>("invalid relocation tag index", 955 object_error::parse_failed); 956 break; 957 case wasm::R_WASM_MEMORY_ADDR_LEB: 958 case wasm::R_WASM_MEMORY_ADDR_SLEB: 959 case wasm::R_WASM_MEMORY_ADDR_I32: 960 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB: 961 case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB: 962 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 963 if (!isValidDataSymbol(Reloc.Index)) 964 return make_error<GenericBinaryError>("invalid relocation data index", 965 object_error::parse_failed); 966 Reloc.Addend = readVarint32(Ctx); 967 break; 968 case wasm::R_WASM_MEMORY_ADDR_LEB64: 969 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 970 case wasm::R_WASM_MEMORY_ADDR_I64: 971 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB64: 972 case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB64: 973 if (!isValidDataSymbol(Reloc.Index)) 974 return make_error<GenericBinaryError>("invalid relocation data index", 975 object_error::parse_failed); 976 Reloc.Addend = readVarint64(Ctx); 977 break; 978 case wasm::R_WASM_FUNCTION_OFFSET_I32: 979 if (!isValidFunctionSymbol(Reloc.Index)) 980 return make_error<GenericBinaryError>( 981 "invalid relocation function index", object_error::parse_failed); 982 Reloc.Addend = readVarint32(Ctx); 983 break; 984 case wasm::R_WASM_FUNCTION_OFFSET_I64: 985 if (!isValidFunctionSymbol(Reloc.Index)) 986 return make_error<GenericBinaryError>( 987 "invalid relocation function index", object_error::parse_failed); 988 Reloc.Addend = readVarint64(Ctx); 989 break; 990 case wasm::R_WASM_SECTION_OFFSET_I32: 991 if (!isValidSectionSymbol(Reloc.Index)) 992 return make_error<GenericBinaryError>( 993 "invalid relocation section index", object_error::parse_failed); 994 Reloc.Addend = readVarint32(Ctx); 995 break; 996 default: 997 return make_error<GenericBinaryError>("invalid relocation type: " + 998 Twine(type), 999 object_error::parse_failed); 1000 } 1001 1002 // Relocations must fit inside the section, and must appear in order. They 1003 // also shouldn't overlap a function/element boundary, but we don't bother 1004 // to check that. 1005 uint64_t Size = 5; 1006 if (Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LEB64 || 1007 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_SLEB64 || 1008 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_REL_SLEB64) 1009 Size = 10; 1010 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 || 1011 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 || 1012 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LOCREL_I32 || 1013 Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 || 1014 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32 || 1015 Reloc.Type == wasm::R_WASM_GLOBAL_INDEX_I32) 1016 Size = 4; 1017 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I64 || 1018 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I64 || 1019 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I64) 1020 Size = 8; 1021 if (Reloc.Offset + Size > EndOffset) 1022 return make_error<GenericBinaryError>("invalid relocation offset", 1023 object_error::parse_failed); 1024 1025 Section.Relocations.push_back(Reloc); 1026 } 1027 if (Ctx.Ptr != Ctx.End) 1028 return make_error<GenericBinaryError>("reloc section ended prematurely", 1029 object_error::parse_failed); 1030 return Error::success(); 1031 } 1032 1033 Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { 1034 if (Sec.Name == "dylink") { 1035 if (Error Err = parseDylinkSection(Ctx)) 1036 return Err; 1037 } else if (Sec.Name == "dylink.0") { 1038 if (Error Err = parseDylink0Section(Ctx)) 1039 return Err; 1040 } else if (Sec.Name == "name") { 1041 if (Error Err = parseNameSection(Ctx)) 1042 return Err; 1043 } else if (Sec.Name == "linking") { 1044 if (Error Err = parseLinkingSection(Ctx)) 1045 return Err; 1046 } else if (Sec.Name == "producers") { 1047 if (Error Err = parseProducersSection(Ctx)) 1048 return Err; 1049 } else if (Sec.Name == "target_features") { 1050 if (Error Err = parseTargetFeaturesSection(Ctx)) 1051 return Err; 1052 } else if (Sec.Name.startswith("reloc.")) { 1053 if (Error Err = parseRelocSection(Sec.Name, Ctx)) 1054 return Err; 1055 } 1056 return Error::success(); 1057 } 1058 1059 Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { 1060 uint32_t Count = readVaruint32(Ctx); 1061 Signatures.reserve(Count); 1062 while (Count--) { 1063 wasm::WasmSignature Sig; 1064 uint8_t Form = readUint8(Ctx); 1065 if (Form != wasm::WASM_TYPE_FUNC) { 1066 return make_error<GenericBinaryError>("invalid signature type", 1067 object_error::parse_failed); 1068 } 1069 uint32_t ParamCount = readVaruint32(Ctx); 1070 Sig.Params.reserve(ParamCount); 1071 while (ParamCount--) { 1072 uint32_t ParamType = readUint8(Ctx); 1073 Sig.Params.push_back(wasm::ValType(ParamType)); 1074 } 1075 uint32_t ReturnCount = readVaruint32(Ctx); 1076 while (ReturnCount--) { 1077 uint32_t ReturnType = readUint8(Ctx); 1078 Sig.Returns.push_back(wasm::ValType(ReturnType)); 1079 } 1080 Signatures.push_back(std::move(Sig)); 1081 } 1082 if (Ctx.Ptr != Ctx.End) 1083 return make_error<GenericBinaryError>("type section ended prematurely", 1084 object_error::parse_failed); 1085 return Error::success(); 1086 } 1087 1088 Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { 1089 uint32_t Count = readVaruint32(Ctx); 1090 uint32_t NumTypes = Signatures.size(); 1091 Imports.reserve(Count); 1092 for (uint32_t I = 0; I < Count; I++) { 1093 wasm::WasmImport Im; 1094 Im.Module = readString(Ctx); 1095 Im.Field = readString(Ctx); 1096 Im.Kind = readUint8(Ctx); 1097 switch (Im.Kind) { 1098 case wasm::WASM_EXTERNAL_FUNCTION: 1099 NumImportedFunctions++; 1100 Im.SigIndex = readVaruint32(Ctx); 1101 if (Im.SigIndex >= NumTypes) 1102 return make_error<GenericBinaryError>("invalid function type", 1103 object_error::parse_failed); 1104 break; 1105 case wasm::WASM_EXTERNAL_GLOBAL: 1106 NumImportedGlobals++; 1107 Im.Global.Type = readUint8(Ctx); 1108 Im.Global.Mutable = readVaruint1(Ctx); 1109 break; 1110 case wasm::WASM_EXTERNAL_MEMORY: 1111 Im.Memory = readLimits(Ctx); 1112 if (Im.Memory.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1113 HasMemory64 = true; 1114 break; 1115 case wasm::WASM_EXTERNAL_TABLE: { 1116 Im.Table = readTableType(Ctx); 1117 NumImportedTables++; 1118 auto ElemType = Im.Table.ElemType; 1119 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1120 ElemType != wasm::WASM_TYPE_EXTERNREF) 1121 return make_error<GenericBinaryError>("invalid table element type", 1122 object_error::parse_failed); 1123 break; 1124 } 1125 case wasm::WASM_EXTERNAL_TAG: 1126 NumImportedTags++; 1127 if (readUint8(Ctx) != 0) // Reserved 'attribute' field 1128 return make_error<GenericBinaryError>("invalid attribute", 1129 object_error::parse_failed); 1130 Im.SigIndex = readVaruint32(Ctx); 1131 if (Im.SigIndex >= NumTypes) 1132 return make_error<GenericBinaryError>("invalid tag type", 1133 object_error::parse_failed); 1134 break; 1135 default: 1136 return make_error<GenericBinaryError>("unexpected import kind", 1137 object_error::parse_failed); 1138 } 1139 Imports.push_back(Im); 1140 } 1141 if (Ctx.Ptr != Ctx.End) 1142 return make_error<GenericBinaryError>("import section ended prematurely", 1143 object_error::parse_failed); 1144 return Error::success(); 1145 } 1146 1147 Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { 1148 uint32_t Count = readVaruint32(Ctx); 1149 Functions.reserve(Count); 1150 uint32_t NumTypes = Signatures.size(); 1151 while (Count--) { 1152 uint32_t Type = readVaruint32(Ctx); 1153 if (Type >= NumTypes) 1154 return make_error<GenericBinaryError>("invalid function type", 1155 object_error::parse_failed); 1156 wasm::WasmFunction F; 1157 F.SigIndex = Type; 1158 Functions.push_back(F); 1159 } 1160 if (Ctx.Ptr != Ctx.End) 1161 return make_error<GenericBinaryError>("function section ended prematurely", 1162 object_error::parse_failed); 1163 return Error::success(); 1164 } 1165 1166 Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { 1167 TableSection = Sections.size(); 1168 uint32_t Count = readVaruint32(Ctx); 1169 Tables.reserve(Count); 1170 while (Count--) { 1171 wasm::WasmTable T; 1172 T.Type = readTableType(Ctx); 1173 T.Index = NumImportedTables + Tables.size(); 1174 Tables.push_back(T); 1175 auto ElemType = Tables.back().Type.ElemType; 1176 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1177 ElemType != wasm::WASM_TYPE_EXTERNREF) { 1178 return make_error<GenericBinaryError>("invalid table element type", 1179 object_error::parse_failed); 1180 } 1181 } 1182 if (Ctx.Ptr != Ctx.End) 1183 return make_error<GenericBinaryError>("table section ended prematurely", 1184 object_error::parse_failed); 1185 return Error::success(); 1186 } 1187 1188 Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { 1189 uint32_t Count = readVaruint32(Ctx); 1190 Memories.reserve(Count); 1191 while (Count--) { 1192 auto Limits = readLimits(Ctx); 1193 if (Limits.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1194 HasMemory64 = true; 1195 Memories.push_back(Limits); 1196 } 1197 if (Ctx.Ptr != Ctx.End) 1198 return make_error<GenericBinaryError>("memory section ended prematurely", 1199 object_error::parse_failed); 1200 return Error::success(); 1201 } 1202 1203 Error WasmObjectFile::parseTagSection(ReadContext &Ctx) { 1204 TagSection = Sections.size(); 1205 uint32_t Count = readVaruint32(Ctx); 1206 Tags.reserve(Count); 1207 uint32_t NumTypes = Signatures.size(); 1208 while (Count--) { 1209 if (readUint8(Ctx) != 0) // Reserved 'attribute' field 1210 return make_error<GenericBinaryError>("invalid attribute", 1211 object_error::parse_failed); 1212 uint32_t Type = readVaruint32(Ctx); 1213 if (Type >= NumTypes) 1214 return make_error<GenericBinaryError>("invalid tag type", 1215 object_error::parse_failed); 1216 wasm::WasmTag Tag; 1217 Tag.Index = NumImportedTags + Tags.size(); 1218 Tag.SigIndex = Type; 1219 Tags.push_back(Tag); 1220 } 1221 1222 if (Ctx.Ptr != Ctx.End) 1223 return make_error<GenericBinaryError>("tag section ended prematurely", 1224 object_error::parse_failed); 1225 return Error::success(); 1226 } 1227 1228 Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { 1229 GlobalSection = Sections.size(); 1230 uint32_t Count = readVaruint32(Ctx); 1231 Globals.reserve(Count); 1232 while (Count--) { 1233 wasm::WasmGlobal Global; 1234 Global.Index = NumImportedGlobals + Globals.size(); 1235 Global.Type.Type = readUint8(Ctx); 1236 Global.Type.Mutable = readVaruint1(Ctx); 1237 if (Error Err = readInitExpr(Global.InitExpr, Ctx)) 1238 return Err; 1239 Globals.push_back(Global); 1240 } 1241 if (Ctx.Ptr != Ctx.End) 1242 return make_error<GenericBinaryError>("global section ended prematurely", 1243 object_error::parse_failed); 1244 return Error::success(); 1245 } 1246 1247 Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { 1248 uint32_t Count = readVaruint32(Ctx); 1249 Exports.reserve(Count); 1250 for (uint32_t I = 0; I < Count; I++) { 1251 wasm::WasmExport Ex; 1252 Ex.Name = readString(Ctx); 1253 Ex.Kind = readUint8(Ctx); 1254 Ex.Index = readVaruint32(Ctx); 1255 switch (Ex.Kind) { 1256 case wasm::WASM_EXTERNAL_FUNCTION: 1257 1258 if (!isDefinedFunctionIndex(Ex.Index)) 1259 return make_error<GenericBinaryError>("invalid function export", 1260 object_error::parse_failed); 1261 getDefinedFunction(Ex.Index).ExportName = Ex.Name; 1262 break; 1263 case wasm::WASM_EXTERNAL_GLOBAL: 1264 if (!isValidGlobalIndex(Ex.Index)) 1265 return make_error<GenericBinaryError>("invalid global export", 1266 object_error::parse_failed); 1267 break; 1268 case wasm::WASM_EXTERNAL_TAG: 1269 if (!isValidTagIndex(Ex.Index)) 1270 return make_error<GenericBinaryError>("invalid tag export", 1271 object_error::parse_failed); 1272 break; 1273 case wasm::WASM_EXTERNAL_MEMORY: 1274 case wasm::WASM_EXTERNAL_TABLE: 1275 break; 1276 default: 1277 return make_error<GenericBinaryError>("unexpected export kind", 1278 object_error::parse_failed); 1279 } 1280 Exports.push_back(Ex); 1281 } 1282 if (Ctx.Ptr != Ctx.End) 1283 return make_error<GenericBinaryError>("export section ended prematurely", 1284 object_error::parse_failed); 1285 return Error::success(); 1286 } 1287 1288 bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { 1289 return Index < NumImportedFunctions + Functions.size(); 1290 } 1291 1292 bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { 1293 return Index >= NumImportedFunctions && isValidFunctionIndex(Index); 1294 } 1295 1296 bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { 1297 return Index < NumImportedGlobals + Globals.size(); 1298 } 1299 1300 bool WasmObjectFile::isValidTableNumber(uint32_t Index) const { 1301 return Index < NumImportedTables + Tables.size(); 1302 } 1303 1304 bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { 1305 return Index >= NumImportedGlobals && isValidGlobalIndex(Index); 1306 } 1307 1308 bool WasmObjectFile::isDefinedTableNumber(uint32_t Index) const { 1309 return Index >= NumImportedTables && isValidTableNumber(Index); 1310 } 1311 1312 bool WasmObjectFile::isValidTagIndex(uint32_t Index) const { 1313 return Index < NumImportedTags + Tags.size(); 1314 } 1315 1316 bool WasmObjectFile::isDefinedTagIndex(uint32_t Index) const { 1317 return Index >= NumImportedTags && isValidTagIndex(Index); 1318 } 1319 1320 bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { 1321 return Index < Symbols.size() && Symbols[Index].isTypeFunction(); 1322 } 1323 1324 bool WasmObjectFile::isValidTableSymbol(uint32_t Index) const { 1325 return Index < Symbols.size() && Symbols[Index].isTypeTable(); 1326 } 1327 1328 bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { 1329 return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); 1330 } 1331 1332 bool WasmObjectFile::isValidTagSymbol(uint32_t Index) const { 1333 return Index < Symbols.size() && Symbols[Index].isTypeTag(); 1334 } 1335 1336 bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { 1337 return Index < Symbols.size() && Symbols[Index].isTypeData(); 1338 } 1339 1340 bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { 1341 return Index < Symbols.size() && Symbols[Index].isTypeSection(); 1342 } 1343 1344 wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { 1345 assert(isDefinedFunctionIndex(Index)); 1346 return Functions[Index - NumImportedFunctions]; 1347 } 1348 1349 const wasm::WasmFunction & 1350 WasmObjectFile::getDefinedFunction(uint32_t Index) const { 1351 assert(isDefinedFunctionIndex(Index)); 1352 return Functions[Index - NumImportedFunctions]; 1353 } 1354 1355 wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) { 1356 assert(isDefinedGlobalIndex(Index)); 1357 return Globals[Index - NumImportedGlobals]; 1358 } 1359 1360 wasm::WasmTag &WasmObjectFile::getDefinedTag(uint32_t Index) { 1361 assert(isDefinedTagIndex(Index)); 1362 return Tags[Index - NumImportedTags]; 1363 } 1364 1365 Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { 1366 StartFunction = readVaruint32(Ctx); 1367 if (!isValidFunctionIndex(StartFunction)) 1368 return make_error<GenericBinaryError>("invalid start function", 1369 object_error::parse_failed); 1370 return Error::success(); 1371 } 1372 1373 Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { 1374 SeenCodeSection = true; 1375 CodeSection = Sections.size(); 1376 uint32_t FunctionCount = readVaruint32(Ctx); 1377 if (FunctionCount != Functions.size()) { 1378 return make_error<GenericBinaryError>("invalid function count", 1379 object_error::parse_failed); 1380 } 1381 1382 for (uint32_t i = 0; i < FunctionCount; i++) { 1383 wasm::WasmFunction& Function = Functions[i]; 1384 const uint8_t *FunctionStart = Ctx.Ptr; 1385 uint32_t Size = readVaruint32(Ctx); 1386 const uint8_t *FunctionEnd = Ctx.Ptr + Size; 1387 1388 Function.CodeOffset = Ctx.Ptr - FunctionStart; 1389 Function.Index = NumImportedFunctions + i; 1390 Function.CodeSectionOffset = FunctionStart - Ctx.Start; 1391 Function.Size = FunctionEnd - FunctionStart; 1392 1393 uint32_t NumLocalDecls = readVaruint32(Ctx); 1394 Function.Locals.reserve(NumLocalDecls); 1395 while (NumLocalDecls--) { 1396 wasm::WasmLocalDecl Decl; 1397 Decl.Count = readVaruint32(Ctx); 1398 Decl.Type = readUint8(Ctx); 1399 Function.Locals.push_back(Decl); 1400 } 1401 1402 uint32_t BodySize = FunctionEnd - Ctx.Ptr; 1403 Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); 1404 // This will be set later when reading in the linking metadata section. 1405 Function.Comdat = UINT32_MAX; 1406 Ctx.Ptr += BodySize; 1407 assert(Ctx.Ptr == FunctionEnd); 1408 } 1409 if (Ctx.Ptr != Ctx.End) 1410 return make_error<GenericBinaryError>("code section ended prematurely", 1411 object_error::parse_failed); 1412 return Error::success(); 1413 } 1414 1415 Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { 1416 uint32_t Count = readVaruint32(Ctx); 1417 ElemSegments.reserve(Count); 1418 while (Count--) { 1419 wasm::WasmElemSegment Segment; 1420 Segment.Flags = readVaruint32(Ctx); 1421 1422 uint32_t SupportedFlags = wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER | 1423 wasm::WASM_ELEM_SEGMENT_IS_PASSIVE | 1424 wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS; 1425 if (Segment.Flags & ~SupportedFlags) 1426 return make_error<GenericBinaryError>( 1427 "Unsupported flags for element segment", object_error::parse_failed); 1428 1429 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER) 1430 Segment.TableNumber = readVaruint32(Ctx); 1431 else 1432 Segment.TableNumber = 0; 1433 if (!isValidTableNumber(Segment.TableNumber)) 1434 return make_error<GenericBinaryError>("invalid TableNumber", 1435 object_error::parse_failed); 1436 1437 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_IS_PASSIVE) { 1438 Segment.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST; 1439 Segment.Offset.Value.Int32 = 0; 1440 } else { 1441 if (Error Err = readInitExpr(Segment.Offset, Ctx)) 1442 return Err; 1443 } 1444 1445 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_MASK_HAS_ELEM_KIND) { 1446 Segment.ElemKind = readUint8(Ctx); 1447 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) { 1448 if (Segment.ElemKind != uint8_t(wasm::ValType::FUNCREF) && 1449 Segment.ElemKind != uint8_t(wasm::ValType::EXTERNREF)) { 1450 return make_error<GenericBinaryError>("invalid reference type", 1451 object_error::parse_failed); 1452 } 1453 } else { 1454 if (Segment.ElemKind != 0) 1455 return make_error<GenericBinaryError>("invalid elemtype", 1456 object_error::parse_failed); 1457 Segment.ElemKind = uint8_t(wasm::ValType::FUNCREF); 1458 } 1459 } else { 1460 Segment.ElemKind = uint8_t(wasm::ValType::FUNCREF); 1461 } 1462 1463 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) 1464 return make_error<GenericBinaryError>( 1465 "elem segment init expressions not yet implemented", 1466 object_error::parse_failed); 1467 1468 uint32_t NumElems = readVaruint32(Ctx); 1469 while (NumElems--) { 1470 Segment.Functions.push_back(readVaruint32(Ctx)); 1471 } 1472 ElemSegments.push_back(Segment); 1473 } 1474 if (Ctx.Ptr != Ctx.End) 1475 return make_error<GenericBinaryError>("elem section ended prematurely", 1476 object_error::parse_failed); 1477 return Error::success(); 1478 } 1479 1480 Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { 1481 DataSection = Sections.size(); 1482 uint32_t Count = readVaruint32(Ctx); 1483 if (DataCount && Count != DataCount.getValue()) 1484 return make_error<GenericBinaryError>( 1485 "number of data segments does not match DataCount section"); 1486 DataSegments.reserve(Count); 1487 while (Count--) { 1488 WasmSegment Segment; 1489 Segment.Data.InitFlags = readVaruint32(Ctx); 1490 Segment.Data.MemoryIndex = 1491 (Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_HAS_MEMINDEX) 1492 ? readVaruint32(Ctx) 1493 : 0; 1494 if ((Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_IS_PASSIVE) == 0) { 1495 if (Error Err = readInitExpr(Segment.Data.Offset, Ctx)) 1496 return Err; 1497 } else { 1498 Segment.Data.Offset.Opcode = wasm::WASM_OPCODE_I32_CONST; 1499 Segment.Data.Offset.Value.Int32 = 0; 1500 } 1501 uint32_t Size = readVaruint32(Ctx); 1502 if (Size > (size_t)(Ctx.End - Ctx.Ptr)) 1503 return make_error<GenericBinaryError>("invalid segment size", 1504 object_error::parse_failed); 1505 Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 1506 // The rest of these Data fields are set later, when reading in the linking 1507 // metadata section. 1508 Segment.Data.Alignment = 0; 1509 Segment.Data.LinkingFlags = 0; 1510 Segment.Data.Comdat = UINT32_MAX; 1511 Segment.SectionOffset = Ctx.Ptr - Ctx.Start; 1512 Ctx.Ptr += Size; 1513 DataSegments.push_back(Segment); 1514 } 1515 if (Ctx.Ptr != Ctx.End) 1516 return make_error<GenericBinaryError>("data section ended prematurely", 1517 object_error::parse_failed); 1518 return Error::success(); 1519 } 1520 1521 Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) { 1522 DataCount = readVaruint32(Ctx); 1523 return Error::success(); 1524 } 1525 1526 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { 1527 return Header; 1528 } 1529 1530 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; } 1531 1532 Expected<uint32_t> WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { 1533 uint32_t Result = SymbolRef::SF_None; 1534 const WasmSymbol &Sym = getWasmSymbol(Symb); 1535 1536 LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); 1537 if (Sym.isBindingWeak()) 1538 Result |= SymbolRef::SF_Weak; 1539 if (!Sym.isBindingLocal()) 1540 Result |= SymbolRef::SF_Global; 1541 if (Sym.isHidden()) 1542 Result |= SymbolRef::SF_Hidden; 1543 if (!Sym.isDefined()) 1544 Result |= SymbolRef::SF_Undefined; 1545 if (Sym.isTypeFunction()) 1546 Result |= SymbolRef::SF_Executable; 1547 return Result; 1548 } 1549 1550 basic_symbol_iterator WasmObjectFile::symbol_begin() const { 1551 DataRefImpl Ref; 1552 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1553 Ref.d.b = 0; // Symbol index 1554 return BasicSymbolRef(Ref, this); 1555 } 1556 1557 basic_symbol_iterator WasmObjectFile::symbol_end() const { 1558 DataRefImpl Ref; 1559 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1560 Ref.d.b = Symbols.size(); // Symbol index 1561 return BasicSymbolRef(Ref, this); 1562 } 1563 1564 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { 1565 return Symbols[Symb.d.b]; 1566 } 1567 1568 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { 1569 return getWasmSymbol(Symb.getRawDataRefImpl()); 1570 } 1571 1572 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { 1573 return getWasmSymbol(Symb).Info.Name; 1574 } 1575 1576 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { 1577 auto &Sym = getWasmSymbol(Symb); 1578 if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION && 1579 isDefinedFunctionIndex(Sym.Info.ElementIndex)) 1580 return getDefinedFunction(Sym.Info.ElementIndex).CodeSectionOffset; 1581 else 1582 return getSymbolValue(Symb); 1583 } 1584 1585 uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const { 1586 switch (Sym.Info.Kind) { 1587 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1588 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1589 case wasm::WASM_SYMBOL_TYPE_TAG: 1590 case wasm::WASM_SYMBOL_TYPE_TABLE: 1591 return Sym.Info.ElementIndex; 1592 case wasm::WASM_SYMBOL_TYPE_DATA: { 1593 // The value of a data symbol is the segment offset, plus the symbol 1594 // offset within the segment. 1595 uint32_t SegmentIndex = Sym.Info.DataRef.Segment; 1596 const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; 1597 if (Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST) { 1598 return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset; 1599 } else if (Segment.Offset.Opcode == wasm::WASM_OPCODE_I64_CONST) { 1600 return Segment.Offset.Value.Int64 + Sym.Info.DataRef.Offset; 1601 } else { 1602 llvm_unreachable("unknown init expr opcode"); 1603 } 1604 } 1605 case wasm::WASM_SYMBOL_TYPE_SECTION: 1606 return 0; 1607 } 1608 llvm_unreachable("invalid symbol type"); 1609 } 1610 1611 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { 1612 return getWasmSymbolValue(getWasmSymbol(Symb)); 1613 } 1614 1615 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { 1616 llvm_unreachable("not yet implemented"); 1617 return 0; 1618 } 1619 1620 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { 1621 llvm_unreachable("not yet implemented"); 1622 return 0; 1623 } 1624 1625 Expected<SymbolRef::Type> 1626 WasmObjectFile::getSymbolType(DataRefImpl Symb) const { 1627 const WasmSymbol &Sym = getWasmSymbol(Symb); 1628 1629 switch (Sym.Info.Kind) { 1630 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1631 return SymbolRef::ST_Function; 1632 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1633 return SymbolRef::ST_Other; 1634 case wasm::WASM_SYMBOL_TYPE_DATA: 1635 return SymbolRef::ST_Data; 1636 case wasm::WASM_SYMBOL_TYPE_SECTION: 1637 return SymbolRef::ST_Debug; 1638 case wasm::WASM_SYMBOL_TYPE_TAG: 1639 return SymbolRef::ST_Other; 1640 case wasm::WASM_SYMBOL_TYPE_TABLE: 1641 return SymbolRef::ST_Other; 1642 } 1643 1644 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1645 return SymbolRef::ST_Other; 1646 } 1647 1648 Expected<section_iterator> 1649 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { 1650 const WasmSymbol &Sym = getWasmSymbol(Symb); 1651 if (Sym.isUndefined()) 1652 return section_end(); 1653 1654 DataRefImpl Ref; 1655 Ref.d.a = getSymbolSectionIdImpl(Sym); 1656 return section_iterator(SectionRef(Ref, this)); 1657 } 1658 1659 uint32_t WasmObjectFile::getSymbolSectionId(SymbolRef Symb) const { 1660 const WasmSymbol &Sym = getWasmSymbol(Symb); 1661 return getSymbolSectionIdImpl(Sym); 1662 } 1663 1664 uint32_t WasmObjectFile::getSymbolSectionIdImpl(const WasmSymbol &Sym) const { 1665 switch (Sym.Info.Kind) { 1666 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1667 return CodeSection; 1668 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1669 return GlobalSection; 1670 case wasm::WASM_SYMBOL_TYPE_DATA: 1671 return DataSection; 1672 case wasm::WASM_SYMBOL_TYPE_SECTION: 1673 return Sym.Info.ElementIndex; 1674 case wasm::WASM_SYMBOL_TYPE_TAG: 1675 return TagSection; 1676 case wasm::WASM_SYMBOL_TYPE_TABLE: 1677 return TableSection; 1678 default: 1679 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1680 } 1681 } 1682 1683 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } 1684 1685 Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const { 1686 const WasmSection &S = Sections[Sec.d.a]; 1687 #define ECase(X) \ 1688 case wasm::WASM_SEC_##X: \ 1689 return #X; 1690 switch (S.Type) { 1691 ECase(TYPE); 1692 ECase(IMPORT); 1693 ECase(FUNCTION); 1694 ECase(TABLE); 1695 ECase(MEMORY); 1696 ECase(GLOBAL); 1697 ECase(TAG); 1698 ECase(EXPORT); 1699 ECase(START); 1700 ECase(ELEM); 1701 ECase(CODE); 1702 ECase(DATA); 1703 ECase(DATACOUNT); 1704 case wasm::WASM_SEC_CUSTOM: 1705 return S.Name; 1706 default: 1707 return createStringError(object_error::invalid_section_index, ""); 1708 } 1709 #undef ECase 1710 } 1711 1712 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; } 1713 1714 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { 1715 return Sec.d.a; 1716 } 1717 1718 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { 1719 const WasmSection &S = Sections[Sec.d.a]; 1720 return S.Content.size(); 1721 } 1722 1723 Expected<ArrayRef<uint8_t>> 1724 WasmObjectFile::getSectionContents(DataRefImpl Sec) const { 1725 const WasmSection &S = Sections[Sec.d.a]; 1726 // This will never fail since wasm sections can never be empty (user-sections 1727 // must have a name and non-user sections each have a defined structure). 1728 return S.Content; 1729 } 1730 1731 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { 1732 return 1; 1733 } 1734 1735 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { 1736 return false; 1737 } 1738 1739 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { 1740 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE; 1741 } 1742 1743 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { 1744 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA; 1745 } 1746 1747 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } 1748 1749 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } 1750 1751 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { 1752 DataRefImpl RelocRef; 1753 RelocRef.d.a = Ref.d.a; 1754 RelocRef.d.b = 0; 1755 return relocation_iterator(RelocationRef(RelocRef, this)); 1756 } 1757 1758 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { 1759 const WasmSection &Sec = getWasmSection(Ref); 1760 DataRefImpl RelocRef; 1761 RelocRef.d.a = Ref.d.a; 1762 RelocRef.d.b = Sec.Relocations.size(); 1763 return relocation_iterator(RelocationRef(RelocRef, this)); 1764 } 1765 1766 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { Rel.d.b++; } 1767 1768 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { 1769 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1770 return Rel.Offset; 1771 } 1772 1773 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { 1774 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1775 if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB) 1776 return symbol_end(); 1777 DataRefImpl Sym; 1778 Sym.d.a = 1; 1779 Sym.d.b = Rel.Index; 1780 return symbol_iterator(SymbolRef(Sym, this)); 1781 } 1782 1783 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { 1784 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1785 return Rel.Type; 1786 } 1787 1788 void WasmObjectFile::getRelocationTypeName( 1789 DataRefImpl Ref, SmallVectorImpl<char> &Result) const { 1790 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1791 StringRef Res = "Unknown"; 1792 1793 #define WASM_RELOC(name, value) \ 1794 case wasm::name: \ 1795 Res = #name; \ 1796 break; 1797 1798 switch (Rel.Type) { 1799 #include "llvm/BinaryFormat/WasmRelocs.def" 1800 } 1801 1802 #undef WASM_RELOC 1803 1804 Result.append(Res.begin(), Res.end()); 1805 } 1806 1807 section_iterator WasmObjectFile::section_begin() const { 1808 DataRefImpl Ref; 1809 Ref.d.a = 0; 1810 return section_iterator(SectionRef(Ref, this)); 1811 } 1812 1813 section_iterator WasmObjectFile::section_end() const { 1814 DataRefImpl Ref; 1815 Ref.d.a = Sections.size(); 1816 return section_iterator(SectionRef(Ref, this)); 1817 } 1818 1819 uint8_t WasmObjectFile::getBytesInAddress() const { 1820 return HasMemory64 ? 8 : 4; 1821 } 1822 1823 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } 1824 1825 Triple::ArchType WasmObjectFile::getArch() const { 1826 return HasMemory64 ? Triple::wasm64 : Triple::wasm32; 1827 } 1828 1829 SubtargetFeatures WasmObjectFile::getFeatures() const { 1830 return SubtargetFeatures(); 1831 } 1832 1833 bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; } 1834 1835 bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; } 1836 1837 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { 1838 assert(Ref.d.a < Sections.size()); 1839 return Sections[Ref.d.a]; 1840 } 1841 1842 const WasmSection & 1843 WasmObjectFile::getWasmSection(const SectionRef &Section) const { 1844 return getWasmSection(Section.getRawDataRefImpl()); 1845 } 1846 1847 const wasm::WasmRelocation & 1848 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { 1849 return getWasmRelocation(Ref.getRawDataRefImpl()); 1850 } 1851 1852 const wasm::WasmRelocation & 1853 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { 1854 assert(Ref.d.a < Sections.size()); 1855 const WasmSection &Sec = Sections[Ref.d.a]; 1856 assert(Ref.d.b < Sec.Relocations.size()); 1857 return Sec.Relocations[Ref.d.b]; 1858 } 1859 1860 int WasmSectionOrderChecker::getSectionOrder(unsigned ID, 1861 StringRef CustomSectionName) { 1862 switch (ID) { 1863 case wasm::WASM_SEC_CUSTOM: 1864 return StringSwitch<unsigned>(CustomSectionName) 1865 .Case("dylink", WASM_SEC_ORDER_DYLINK) 1866 .Case("dylink.0", WASM_SEC_ORDER_DYLINK) 1867 .Case("linking", WASM_SEC_ORDER_LINKING) 1868 .StartsWith("reloc.", WASM_SEC_ORDER_RELOC) 1869 .Case("name", WASM_SEC_ORDER_NAME) 1870 .Case("producers", WASM_SEC_ORDER_PRODUCERS) 1871 .Case("target_features", WASM_SEC_ORDER_TARGET_FEATURES) 1872 .Default(WASM_SEC_ORDER_NONE); 1873 case wasm::WASM_SEC_TYPE: 1874 return WASM_SEC_ORDER_TYPE; 1875 case wasm::WASM_SEC_IMPORT: 1876 return WASM_SEC_ORDER_IMPORT; 1877 case wasm::WASM_SEC_FUNCTION: 1878 return WASM_SEC_ORDER_FUNCTION; 1879 case wasm::WASM_SEC_TABLE: 1880 return WASM_SEC_ORDER_TABLE; 1881 case wasm::WASM_SEC_MEMORY: 1882 return WASM_SEC_ORDER_MEMORY; 1883 case wasm::WASM_SEC_GLOBAL: 1884 return WASM_SEC_ORDER_GLOBAL; 1885 case wasm::WASM_SEC_EXPORT: 1886 return WASM_SEC_ORDER_EXPORT; 1887 case wasm::WASM_SEC_START: 1888 return WASM_SEC_ORDER_START; 1889 case wasm::WASM_SEC_ELEM: 1890 return WASM_SEC_ORDER_ELEM; 1891 case wasm::WASM_SEC_CODE: 1892 return WASM_SEC_ORDER_CODE; 1893 case wasm::WASM_SEC_DATA: 1894 return WASM_SEC_ORDER_DATA; 1895 case wasm::WASM_SEC_DATACOUNT: 1896 return WASM_SEC_ORDER_DATACOUNT; 1897 case wasm::WASM_SEC_TAG: 1898 return WASM_SEC_ORDER_TAG; 1899 default: 1900 return WASM_SEC_ORDER_NONE; 1901 } 1902 } 1903 1904 // Represents the edges in a directed graph where any node B reachable from node 1905 // A is not allowed to appear before A in the section ordering, but may appear 1906 // afterward. 1907 int WasmSectionOrderChecker::DisallowedPredecessors 1908 [WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = { 1909 // WASM_SEC_ORDER_NONE 1910 {}, 1911 // WASM_SEC_ORDER_TYPE 1912 {WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, 1913 // WASM_SEC_ORDER_IMPORT 1914 {WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, 1915 // WASM_SEC_ORDER_FUNCTION 1916 {WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, 1917 // WASM_SEC_ORDER_TABLE 1918 {WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, 1919 // WASM_SEC_ORDER_MEMORY 1920 {WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_TAG}, 1921 // WASM_SEC_ORDER_TAG 1922 {WASM_SEC_ORDER_TAG, WASM_SEC_ORDER_GLOBAL}, 1923 // WASM_SEC_ORDER_GLOBAL 1924 {WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EXPORT}, 1925 // WASM_SEC_ORDER_EXPORT 1926 {WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, 1927 // WASM_SEC_ORDER_START 1928 {WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, 1929 // WASM_SEC_ORDER_ELEM 1930 {WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, 1931 // WASM_SEC_ORDER_DATACOUNT 1932 {WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, 1933 // WASM_SEC_ORDER_CODE 1934 {WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, 1935 // WASM_SEC_ORDER_DATA 1936 {WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, 1937 1938 // Custom Sections 1939 // WASM_SEC_ORDER_DYLINK 1940 {WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, 1941 // WASM_SEC_ORDER_LINKING 1942 {WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, 1943 // WASM_SEC_ORDER_RELOC (can be repeated) 1944 {}, 1945 // WASM_SEC_ORDER_NAME 1946 {WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, 1947 // WASM_SEC_ORDER_PRODUCERS 1948 {WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, 1949 // WASM_SEC_ORDER_TARGET_FEATURES 1950 {WASM_SEC_ORDER_TARGET_FEATURES}}; 1951 1952 bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID, 1953 StringRef CustomSectionName) { 1954 int Order = getSectionOrder(ID, CustomSectionName); 1955 if (Order == WASM_SEC_ORDER_NONE) 1956 return true; 1957 1958 // Disallowed predecessors we need to check for 1959 SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList; 1960 1961 // Keep track of completed checks to avoid repeating work 1962 bool Checked[WASM_NUM_SEC_ORDERS] = {}; 1963 1964 int Curr = Order; 1965 while (true) { 1966 // Add new disallowed predecessors to work list 1967 for (size_t I = 0;; ++I) { 1968 int Next = DisallowedPredecessors[Curr][I]; 1969 if (Next == WASM_SEC_ORDER_NONE) 1970 break; 1971 if (Checked[Next]) 1972 continue; 1973 WorkList.push_back(Next); 1974 Checked[Next] = true; 1975 } 1976 1977 if (WorkList.empty()) 1978 break; 1979 1980 // Consider next disallowed predecessor 1981 Curr = WorkList.pop_back_val(); 1982 if (Seen[Curr]) 1983 return false; 1984 } 1985 1986 // Have not seen any disallowed predecessors 1987 Seen[Order] = true; 1988 return true; 1989 } 1990