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/SmallSet.h" 12 #include "llvm/ADT/StringRef.h" 13 #include "llvm/ADT/StringSet.h" 14 #include "llvm/ADT/StringSwitch.h" 15 #include "llvm/BinaryFormat/Wasm.h" 16 #include "llvm/Object/Binary.h" 17 #include "llvm/Object/Error.h" 18 #include "llvm/Object/ObjectFile.h" 19 #include "llvm/Object/SymbolicFile.h" 20 #include "llvm/Object/Wasm.h" 21 #include "llvm/Support/Endian.h" 22 #include "llvm/Support/Error.h" 23 #include "llvm/Support/ErrorHandling.h" 24 #include "llvm/Support/LEB128.h" 25 #include "llvm/Support/ScopedPrinter.h" 26 #include "llvm/TargetParser/SubtargetFeature.h" 27 #include "llvm/TargetParser/Triple.h" 28 #include <algorithm> 29 #include <cassert> 30 #include <cstdint> 31 #include <cstring> 32 33 #define DEBUG_TYPE "wasm-object" 34 35 using namespace llvm; 36 using namespace object; 37 38 void WasmSymbol::print(raw_ostream &Out) const { 39 Out << "Name=" << Info.Name 40 << ", Kind=" << toString(wasm::WasmSymbolType(Info.Kind)) << ", Flags=0x" 41 << Twine::utohexstr(Info.Flags) << " ["; 42 switch (getBinding()) { 43 case wasm::WASM_SYMBOL_BINDING_GLOBAL: Out << "global"; break; 44 case wasm::WASM_SYMBOL_BINDING_LOCAL: Out << "local"; break; 45 case wasm::WASM_SYMBOL_BINDING_WEAK: Out << "weak"; break; 46 } 47 if (isHidden()) { 48 Out << ", hidden"; 49 } else { 50 Out << ", default"; 51 } 52 Out << "]"; 53 if (!isTypeData()) { 54 Out << ", ElemIndex=" << Info.ElementIndex; 55 } else if (isDefined()) { 56 Out << ", Segment=" << Info.DataRef.Segment; 57 Out << ", Offset=" << Info.DataRef.Offset; 58 Out << ", Size=" << Info.DataRef.Size; 59 } 60 } 61 62 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) 63 LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(dbgs()); } 64 #endif 65 66 Expected<std::unique_ptr<WasmObjectFile>> 67 ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) { 68 Error Err = Error::success(); 69 auto ObjectFile = std::make_unique<WasmObjectFile>(Buffer, Err); 70 if (Err) 71 return std::move(Err); 72 73 return std::move(ObjectFile); 74 } 75 76 #define VARINT7_MAX ((1 << 7) - 1) 77 #define VARINT7_MIN (-(1 << 7)) 78 #define VARUINT7_MAX (1 << 7) 79 #define VARUINT1_MAX (1) 80 81 static uint8_t readUint8(WasmObjectFile::ReadContext &Ctx) { 82 if (Ctx.Ptr == Ctx.End) 83 report_fatal_error("EOF while reading uint8"); 84 return *Ctx.Ptr++; 85 } 86 87 static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) { 88 if (Ctx.Ptr + 4 > Ctx.End) 89 report_fatal_error("EOF while reading uint32"); 90 uint32_t Result = support::endian::read32le(Ctx.Ptr); 91 Ctx.Ptr += 4; 92 return Result; 93 } 94 95 static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) { 96 if (Ctx.Ptr + 4 > Ctx.End) 97 report_fatal_error("EOF while reading float64"); 98 int32_t Result = 0; 99 memcpy(&Result, Ctx.Ptr, sizeof(Result)); 100 Ctx.Ptr += sizeof(Result); 101 return Result; 102 } 103 104 static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) { 105 if (Ctx.Ptr + 8 > Ctx.End) 106 report_fatal_error("EOF while reading float64"); 107 int64_t Result = 0; 108 memcpy(&Result, Ctx.Ptr, sizeof(Result)); 109 Ctx.Ptr += sizeof(Result); 110 return Result; 111 } 112 113 static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) { 114 unsigned Count; 115 const char *Error = nullptr; 116 uint64_t Result = decodeULEB128(Ctx.Ptr, &Count, Ctx.End, &Error); 117 if (Error) 118 report_fatal_error(Error); 119 Ctx.Ptr += Count; 120 return Result; 121 } 122 123 static StringRef readString(WasmObjectFile::ReadContext &Ctx) { 124 uint32_t StringLen = readULEB128(Ctx); 125 if (Ctx.Ptr + StringLen > Ctx.End) 126 report_fatal_error("EOF while reading string"); 127 StringRef Return = 128 StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen); 129 Ctx.Ptr += StringLen; 130 return Return; 131 } 132 133 static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) { 134 unsigned Count; 135 const char *Error = nullptr; 136 uint64_t Result = decodeSLEB128(Ctx.Ptr, &Count, Ctx.End, &Error); 137 if (Error) 138 report_fatal_error(Error); 139 Ctx.Ptr += Count; 140 return Result; 141 } 142 143 static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) { 144 int64_t Result = readLEB128(Ctx); 145 if (Result > VARUINT1_MAX || Result < 0) 146 report_fatal_error("LEB is outside Varuint1 range"); 147 return Result; 148 } 149 150 static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) { 151 int64_t Result = readLEB128(Ctx); 152 if (Result > INT32_MAX || Result < INT32_MIN) 153 report_fatal_error("LEB is outside Varint32 range"); 154 return Result; 155 } 156 157 static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) { 158 uint64_t Result = readULEB128(Ctx); 159 if (Result > UINT32_MAX) 160 report_fatal_error("LEB is outside Varuint32 range"); 161 return Result; 162 } 163 164 static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) { 165 return readLEB128(Ctx); 166 } 167 168 static uint64_t readVaruint64(WasmObjectFile::ReadContext &Ctx) { 169 return readULEB128(Ctx); 170 } 171 172 static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) { 173 return readUint8(Ctx); 174 } 175 176 static Error readInitExpr(wasm::WasmInitExpr &Expr, 177 WasmObjectFile::ReadContext &Ctx) { 178 auto Start = Ctx.Ptr; 179 180 Expr.Extended = false; 181 Expr.Inst.Opcode = readOpcode(Ctx); 182 switch (Expr.Inst.Opcode) { 183 case wasm::WASM_OPCODE_I32_CONST: 184 Expr.Inst.Value.Int32 = readVarint32(Ctx); 185 break; 186 case wasm::WASM_OPCODE_I64_CONST: 187 Expr.Inst.Value.Int64 = readVarint64(Ctx); 188 break; 189 case wasm::WASM_OPCODE_F32_CONST: 190 Expr.Inst.Value.Float32 = readFloat32(Ctx); 191 break; 192 case wasm::WASM_OPCODE_F64_CONST: 193 Expr.Inst.Value.Float64 = readFloat64(Ctx); 194 break; 195 case wasm::WASM_OPCODE_GLOBAL_GET: 196 Expr.Inst.Value.Global = readULEB128(Ctx); 197 break; 198 case wasm::WASM_OPCODE_REF_NULL: { 199 wasm::ValType Ty = static_cast<wasm::ValType>(readULEB128(Ctx)); 200 if (Ty != wasm::ValType::EXTERNREF) { 201 return make_error<GenericBinaryError>("invalid type for ref.null", 202 object_error::parse_failed); 203 } 204 break; 205 } 206 default: 207 Expr.Extended = true; 208 } 209 210 if (!Expr.Extended) { 211 uint8_t EndOpcode = readOpcode(Ctx); 212 if (EndOpcode != wasm::WASM_OPCODE_END) 213 Expr.Extended = true; 214 } 215 216 if (Expr.Extended) { 217 Ctx.Ptr = Start; 218 while (true) { 219 uint8_t Opcode = readOpcode(Ctx); 220 switch (Opcode) { 221 case wasm::WASM_OPCODE_I32_CONST: 222 case wasm::WASM_OPCODE_GLOBAL_GET: 223 case wasm::WASM_OPCODE_REF_NULL: 224 case wasm::WASM_OPCODE_I64_CONST: 225 case wasm::WASM_OPCODE_F32_CONST: 226 case wasm::WASM_OPCODE_F64_CONST: 227 readULEB128(Ctx); 228 break; 229 case wasm::WASM_OPCODE_I32_ADD: 230 case wasm::WASM_OPCODE_I32_SUB: 231 case wasm::WASM_OPCODE_I32_MUL: 232 case wasm::WASM_OPCODE_I64_ADD: 233 case wasm::WASM_OPCODE_I64_SUB: 234 case wasm::WASM_OPCODE_I64_MUL: 235 break; 236 case wasm::WASM_OPCODE_END: 237 Expr.Body = ArrayRef<uint8_t>(Start, Ctx.Ptr - Start); 238 return Error::success(); 239 default: 240 return make_error<GenericBinaryError>( 241 Twine("invalid opcode in init_expr: ") + Twine(unsigned(Opcode)), 242 object_error::parse_failed); 243 } 244 } 245 } 246 247 return Error::success(); 248 } 249 250 static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) { 251 wasm::WasmLimits Result; 252 Result.Flags = readVaruint32(Ctx); 253 Result.Minimum = readVaruint64(Ctx); 254 if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) 255 Result.Maximum = readVaruint64(Ctx); 256 return Result; 257 } 258 259 static wasm::WasmTableType readTableType(WasmObjectFile::ReadContext &Ctx) { 260 wasm::WasmTableType TableType; 261 TableType.ElemType = readUint8(Ctx); 262 TableType.Limits = readLimits(Ctx); 263 return TableType; 264 } 265 266 static Error readSection(WasmSection &Section, WasmObjectFile::ReadContext &Ctx, 267 WasmSectionOrderChecker &Checker) { 268 Section.Offset = Ctx.Ptr - Ctx.Start; 269 Section.Type = readUint8(Ctx); 270 LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n"); 271 // When reading the section's size, store the size of the LEB used to encode 272 // it. This allows objcopy/strip to reproduce the binary identically. 273 const uint8_t *PreSizePtr = Ctx.Ptr; 274 uint32_t Size = readVaruint32(Ctx); 275 Section.HeaderSecSizeEncodingLen = Ctx.Ptr - PreSizePtr; 276 if (Size == 0) 277 return make_error<StringError>("zero length section", 278 object_error::parse_failed); 279 if (Ctx.Ptr + Size > Ctx.End) 280 return make_error<StringError>("section too large", 281 object_error::parse_failed); 282 if (Section.Type == wasm::WASM_SEC_CUSTOM) { 283 WasmObjectFile::ReadContext SectionCtx; 284 SectionCtx.Start = Ctx.Ptr; 285 SectionCtx.Ptr = Ctx.Ptr; 286 SectionCtx.End = Ctx.Ptr + Size; 287 288 Section.Name = readString(SectionCtx); 289 290 uint32_t SectionNameSize = SectionCtx.Ptr - SectionCtx.Start; 291 Ctx.Ptr += SectionNameSize; 292 Size -= SectionNameSize; 293 } 294 295 if (!Checker.isValidSectionOrder(Section.Type, Section.Name)) { 296 return make_error<StringError>("out of order section type: " + 297 llvm::to_string(Section.Type), 298 object_error::parse_failed); 299 } 300 301 Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 302 Ctx.Ptr += Size; 303 return Error::success(); 304 } 305 306 WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) 307 : ObjectFile(Binary::ID_Wasm, Buffer) { 308 ErrorAsOutParameter ErrAsOutParam(&Err); 309 Header.Magic = getData().substr(0, 4); 310 if (Header.Magic != StringRef("\0asm", 4)) { 311 Err = make_error<StringError>("invalid magic number", 312 object_error::parse_failed); 313 return; 314 } 315 316 ReadContext Ctx; 317 Ctx.Start = getData().bytes_begin(); 318 Ctx.Ptr = Ctx.Start + 4; 319 Ctx.End = Ctx.Start + getData().size(); 320 321 if (Ctx.Ptr + 4 > Ctx.End) { 322 Err = make_error<StringError>("missing version number", 323 object_error::parse_failed); 324 return; 325 } 326 327 Header.Version = readUint32(Ctx); 328 if (Header.Version != wasm::WasmVersion) { 329 Err = make_error<StringError>("invalid version number: " + 330 Twine(Header.Version), 331 object_error::parse_failed); 332 return; 333 } 334 335 WasmSectionOrderChecker Checker; 336 while (Ctx.Ptr < Ctx.End) { 337 WasmSection Sec; 338 if ((Err = readSection(Sec, Ctx, Checker))) 339 return; 340 if ((Err = parseSection(Sec))) 341 return; 342 343 Sections.push_back(Sec); 344 } 345 } 346 347 Error WasmObjectFile::parseSection(WasmSection &Sec) { 348 ReadContext Ctx; 349 Ctx.Start = Sec.Content.data(); 350 Ctx.End = Ctx.Start + Sec.Content.size(); 351 Ctx.Ptr = Ctx.Start; 352 switch (Sec.Type) { 353 case wasm::WASM_SEC_CUSTOM: 354 return parseCustomSection(Sec, Ctx); 355 case wasm::WASM_SEC_TYPE: 356 return parseTypeSection(Ctx); 357 case wasm::WASM_SEC_IMPORT: 358 return parseImportSection(Ctx); 359 case wasm::WASM_SEC_FUNCTION: 360 return parseFunctionSection(Ctx); 361 case wasm::WASM_SEC_TABLE: 362 return parseTableSection(Ctx); 363 case wasm::WASM_SEC_MEMORY: 364 return parseMemorySection(Ctx); 365 case wasm::WASM_SEC_TAG: 366 return parseTagSection(Ctx); 367 case wasm::WASM_SEC_GLOBAL: 368 return parseGlobalSection(Ctx); 369 case wasm::WASM_SEC_EXPORT: 370 return parseExportSection(Ctx); 371 case wasm::WASM_SEC_START: 372 return parseStartSection(Ctx); 373 case wasm::WASM_SEC_ELEM: 374 return parseElemSection(Ctx); 375 case wasm::WASM_SEC_CODE: 376 return parseCodeSection(Ctx); 377 case wasm::WASM_SEC_DATA: 378 return parseDataSection(Ctx); 379 case wasm::WASM_SEC_DATACOUNT: 380 return parseDataCountSection(Ctx); 381 default: 382 return make_error<GenericBinaryError>( 383 "invalid section type: " + Twine(Sec.Type), object_error::parse_failed); 384 } 385 } 386 387 Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) { 388 // Legacy "dylink" section support. 389 // See parseDylink0Section for the current "dylink.0" section parsing. 390 HasDylinkSection = true; 391 DylinkInfo.MemorySize = readVaruint32(Ctx); 392 DylinkInfo.MemoryAlignment = readVaruint32(Ctx); 393 DylinkInfo.TableSize = readVaruint32(Ctx); 394 DylinkInfo.TableAlignment = readVaruint32(Ctx); 395 uint32_t Count = readVaruint32(Ctx); 396 while (Count--) { 397 DylinkInfo.Needed.push_back(readString(Ctx)); 398 } 399 400 if (Ctx.Ptr != Ctx.End) 401 return make_error<GenericBinaryError>("dylink section ended prematurely", 402 object_error::parse_failed); 403 return Error::success(); 404 } 405 406 Error WasmObjectFile::parseDylink0Section(ReadContext &Ctx) { 407 // See 408 // https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md 409 HasDylinkSection = true; 410 411 const uint8_t *OrigEnd = Ctx.End; 412 while (Ctx.Ptr < OrigEnd) { 413 Ctx.End = OrigEnd; 414 uint8_t Type = readUint8(Ctx); 415 uint32_t Size = readVaruint32(Ctx); 416 LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size 417 << "\n"); 418 Ctx.End = Ctx.Ptr + Size; 419 uint32_t Count; 420 switch (Type) { 421 case wasm::WASM_DYLINK_MEM_INFO: 422 DylinkInfo.MemorySize = readVaruint32(Ctx); 423 DylinkInfo.MemoryAlignment = readVaruint32(Ctx); 424 DylinkInfo.TableSize = readVaruint32(Ctx); 425 DylinkInfo.TableAlignment = readVaruint32(Ctx); 426 break; 427 case wasm::WASM_DYLINK_NEEDED: 428 Count = readVaruint32(Ctx); 429 while (Count--) { 430 DylinkInfo.Needed.push_back(readString(Ctx)); 431 } 432 break; 433 case wasm::WASM_DYLINK_EXPORT_INFO: { 434 uint32_t Count = readVaruint32(Ctx); 435 while (Count--) { 436 DylinkInfo.ExportInfo.push_back({readString(Ctx), readVaruint32(Ctx)}); 437 } 438 break; 439 } 440 case wasm::WASM_DYLINK_IMPORT_INFO: { 441 uint32_t Count = readVaruint32(Ctx); 442 while (Count--) { 443 DylinkInfo.ImportInfo.push_back( 444 {readString(Ctx), readString(Ctx), readVaruint32(Ctx)}); 445 } 446 break; 447 } 448 default: 449 LLVM_DEBUG(dbgs() << "unknown dylink.0 sub-section: " << Type << "\n"); 450 Ctx.Ptr += Size; 451 break; 452 } 453 if (Ctx.Ptr != Ctx.End) { 454 return make_error<GenericBinaryError>( 455 "dylink.0 sub-section ended prematurely", object_error::parse_failed); 456 } 457 } 458 459 if (Ctx.Ptr != Ctx.End) 460 return make_error<GenericBinaryError>("dylink.0 section ended prematurely", 461 object_error::parse_failed); 462 return Error::success(); 463 } 464 465 Error WasmObjectFile::parseNameSection(ReadContext &Ctx) { 466 llvm::DenseSet<uint64_t> SeenFunctions; 467 llvm::DenseSet<uint64_t> SeenGlobals; 468 llvm::DenseSet<uint64_t> SeenSegments; 469 470 while (Ctx.Ptr < Ctx.End) { 471 uint8_t Type = readUint8(Ctx); 472 uint32_t Size = readVaruint32(Ctx); 473 const uint8_t *SubSectionEnd = Ctx.Ptr + Size; 474 switch (Type) { 475 case wasm::WASM_NAMES_FUNCTION: 476 case wasm::WASM_NAMES_GLOBAL: 477 case wasm::WASM_NAMES_DATA_SEGMENT: { 478 uint32_t Count = readVaruint32(Ctx); 479 while (Count--) { 480 uint32_t Index = readVaruint32(Ctx); 481 StringRef Name = readString(Ctx); 482 wasm::NameType nameType = wasm::NameType::FUNCTION; 483 if (Type == wasm::WASM_NAMES_FUNCTION) { 484 if (!SeenFunctions.insert(Index).second) 485 return make_error<GenericBinaryError>( 486 "function named more than once", object_error::parse_failed); 487 if (!isValidFunctionIndex(Index) || Name.empty()) 488 return make_error<GenericBinaryError>("invalid function name entry", 489 object_error::parse_failed); 490 491 if (isDefinedFunctionIndex(Index)) 492 getDefinedFunction(Index).DebugName = Name; 493 } else if (Type == wasm::WASM_NAMES_GLOBAL) { 494 nameType = wasm::NameType::GLOBAL; 495 if (!SeenGlobals.insert(Index).second) 496 return make_error<GenericBinaryError>("global named more than once", 497 object_error::parse_failed); 498 if (!isValidGlobalIndex(Index) || Name.empty()) 499 return make_error<GenericBinaryError>("invalid global name entry", 500 object_error::parse_failed); 501 } else { 502 nameType = wasm::NameType::DATA_SEGMENT; 503 if (!SeenSegments.insert(Index).second) 504 return make_error<GenericBinaryError>( 505 "segment named more than once", object_error::parse_failed); 506 if (Index > DataSegments.size()) 507 return make_error<GenericBinaryError>("invalid data segment name entry", 508 object_error::parse_failed); 509 } 510 DebugNames.push_back(wasm::WasmDebugName{nameType, Index, Name}); 511 } 512 break; 513 } 514 // Ignore local names for now 515 case wasm::WASM_NAMES_LOCAL: 516 default: 517 Ctx.Ptr += Size; 518 break; 519 } 520 if (Ctx.Ptr != SubSectionEnd) 521 return make_error<GenericBinaryError>( 522 "name sub-section ended prematurely", object_error::parse_failed); 523 } 524 525 if (Ctx.Ptr != Ctx.End) 526 return make_error<GenericBinaryError>("name section ended prematurely", 527 object_error::parse_failed); 528 return Error::success(); 529 } 530 531 Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) { 532 HasLinkingSection = true; 533 534 LinkingData.Version = readVaruint32(Ctx); 535 if (LinkingData.Version != wasm::WasmMetadataVersion) { 536 return make_error<GenericBinaryError>( 537 "unexpected metadata version: " + Twine(LinkingData.Version) + 538 " (Expected: " + Twine(wasm::WasmMetadataVersion) + ")", 539 object_error::parse_failed); 540 } 541 542 const uint8_t *OrigEnd = Ctx.End; 543 while (Ctx.Ptr < OrigEnd) { 544 Ctx.End = OrigEnd; 545 uint8_t Type = readUint8(Ctx); 546 uint32_t Size = readVaruint32(Ctx); 547 LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size 548 << "\n"); 549 Ctx.End = Ctx.Ptr + Size; 550 switch (Type) { 551 case wasm::WASM_SYMBOL_TABLE: 552 if (Error Err = parseLinkingSectionSymtab(Ctx)) 553 return Err; 554 break; 555 case wasm::WASM_SEGMENT_INFO: { 556 uint32_t Count = readVaruint32(Ctx); 557 if (Count > DataSegments.size()) 558 return make_error<GenericBinaryError>("too many segment names", 559 object_error::parse_failed); 560 for (uint32_t I = 0; I < Count; I++) { 561 DataSegments[I].Data.Name = readString(Ctx); 562 DataSegments[I].Data.Alignment = readVaruint32(Ctx); 563 DataSegments[I].Data.LinkingFlags = readVaruint32(Ctx); 564 } 565 break; 566 } 567 case wasm::WASM_INIT_FUNCS: { 568 uint32_t Count = readVaruint32(Ctx); 569 LinkingData.InitFunctions.reserve(Count); 570 for (uint32_t I = 0; I < Count; I++) { 571 wasm::WasmInitFunc Init; 572 Init.Priority = readVaruint32(Ctx); 573 Init.Symbol = readVaruint32(Ctx); 574 if (!isValidFunctionSymbol(Init.Symbol)) 575 return make_error<GenericBinaryError>("invalid function symbol: " + 576 Twine(Init.Symbol), 577 object_error::parse_failed); 578 LinkingData.InitFunctions.emplace_back(Init); 579 } 580 break; 581 } 582 case wasm::WASM_COMDAT_INFO: 583 if (Error Err = parseLinkingSectionComdat(Ctx)) 584 return Err; 585 break; 586 default: 587 Ctx.Ptr += Size; 588 break; 589 } 590 if (Ctx.Ptr != Ctx.End) 591 return make_error<GenericBinaryError>( 592 "linking sub-section ended prematurely", object_error::parse_failed); 593 } 594 if (Ctx.Ptr != OrigEnd) 595 return make_error<GenericBinaryError>("linking section ended prematurely", 596 object_error::parse_failed); 597 return Error::success(); 598 } 599 600 Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) { 601 uint32_t Count = readVaruint32(Ctx); 602 LinkingData.SymbolTable.reserve(Count); 603 Symbols.reserve(Count); 604 StringSet<> SymbolNames; 605 606 std::vector<wasm::WasmImport *> ImportedGlobals; 607 std::vector<wasm::WasmImport *> ImportedFunctions; 608 std::vector<wasm::WasmImport *> ImportedTags; 609 std::vector<wasm::WasmImport *> ImportedTables; 610 ImportedGlobals.reserve(Imports.size()); 611 ImportedFunctions.reserve(Imports.size()); 612 ImportedTags.reserve(Imports.size()); 613 ImportedTables.reserve(Imports.size()); 614 for (auto &I : Imports) { 615 if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION) 616 ImportedFunctions.emplace_back(&I); 617 else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL) 618 ImportedGlobals.emplace_back(&I); 619 else if (I.Kind == wasm::WASM_EXTERNAL_TAG) 620 ImportedTags.emplace_back(&I); 621 else if (I.Kind == wasm::WASM_EXTERNAL_TABLE) 622 ImportedTables.emplace_back(&I); 623 } 624 625 while (Count--) { 626 wasm::WasmSymbolInfo Info; 627 const wasm::WasmSignature *Signature = nullptr; 628 const wasm::WasmGlobalType *GlobalType = nullptr; 629 const wasm::WasmTableType *TableType = nullptr; 630 631 Info.Kind = readUint8(Ctx); 632 Info.Flags = readVaruint32(Ctx); 633 bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0; 634 635 switch (Info.Kind) { 636 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 637 Info.ElementIndex = readVaruint32(Ctx); 638 if (!isValidFunctionIndex(Info.ElementIndex) || 639 IsDefined != isDefinedFunctionIndex(Info.ElementIndex)) 640 return make_error<GenericBinaryError>("invalid function symbol index", 641 object_error::parse_failed); 642 if (IsDefined) { 643 Info.Name = readString(Ctx); 644 unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; 645 wasm::WasmFunction &Function = Functions[FuncIndex]; 646 Signature = &Signatures[Function.SigIndex]; 647 if (Function.SymbolName.empty()) 648 Function.SymbolName = Info.Name; 649 } else { 650 wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex]; 651 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 652 Info.Name = readString(Ctx); 653 Info.ImportName = Import.Field; 654 } else { 655 Info.Name = Import.Field; 656 } 657 Signature = &Signatures[Import.SigIndex]; 658 Info.ImportModule = Import.Module; 659 } 660 break; 661 662 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 663 Info.ElementIndex = readVaruint32(Ctx); 664 if (!isValidGlobalIndex(Info.ElementIndex) || 665 IsDefined != isDefinedGlobalIndex(Info.ElementIndex)) 666 return make_error<GenericBinaryError>("invalid global symbol index", 667 object_error::parse_failed); 668 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 669 wasm::WASM_SYMBOL_BINDING_WEAK) 670 return make_error<GenericBinaryError>("undefined weak global symbol", 671 object_error::parse_failed); 672 if (IsDefined) { 673 Info.Name = readString(Ctx); 674 unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals; 675 wasm::WasmGlobal &Global = Globals[GlobalIndex]; 676 GlobalType = &Global.Type; 677 if (Global.SymbolName.empty()) 678 Global.SymbolName = Info.Name; 679 } else { 680 wasm::WasmImport &Import = *ImportedGlobals[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 GlobalType = &Import.Global; 688 Info.ImportModule = Import.Module; 689 } 690 break; 691 692 case wasm::WASM_SYMBOL_TYPE_TABLE: 693 Info.ElementIndex = readVaruint32(Ctx); 694 if (!isValidTableNumber(Info.ElementIndex) || 695 IsDefined != isDefinedTableNumber(Info.ElementIndex)) 696 return make_error<GenericBinaryError>("invalid table symbol index", 697 object_error::parse_failed); 698 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 699 wasm::WASM_SYMBOL_BINDING_WEAK) 700 return make_error<GenericBinaryError>("undefined weak table symbol", 701 object_error::parse_failed); 702 if (IsDefined) { 703 Info.Name = readString(Ctx); 704 unsigned TableNumber = Info.ElementIndex - NumImportedTables; 705 wasm::WasmTable &Table = Tables[TableNumber]; 706 TableType = &Table.Type; 707 if (Table.SymbolName.empty()) 708 Table.SymbolName = Info.Name; 709 } else { 710 wasm::WasmImport &Import = *ImportedTables[Info.ElementIndex]; 711 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 712 Info.Name = readString(Ctx); 713 Info.ImportName = Import.Field; 714 } else { 715 Info.Name = Import.Field; 716 } 717 TableType = &Import.Table; 718 Info.ImportModule = Import.Module; 719 } 720 break; 721 722 case wasm::WASM_SYMBOL_TYPE_DATA: 723 Info.Name = readString(Ctx); 724 if (IsDefined) { 725 auto Index = readVaruint32(Ctx); 726 if (Index >= DataSegments.size()) 727 return make_error<GenericBinaryError>("invalid data symbol index", 728 object_error::parse_failed); 729 auto Offset = readVaruint64(Ctx); 730 auto Size = readVaruint64(Ctx); 731 size_t SegmentSize = DataSegments[Index].Data.Content.size(); 732 if (Offset > SegmentSize) 733 return make_error<GenericBinaryError>( 734 "invalid data symbol offset: `" + Info.Name + "` (offset: " + 735 Twine(Offset) + " segment size: " + Twine(SegmentSize) + ")", 736 object_error::parse_failed); 737 Info.DataRef = wasm::WasmDataReference{Index, Offset, Size}; 738 } 739 break; 740 741 case wasm::WASM_SYMBOL_TYPE_SECTION: { 742 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 743 wasm::WASM_SYMBOL_BINDING_LOCAL) 744 return make_error<GenericBinaryError>( 745 "section symbols must have local binding", 746 object_error::parse_failed); 747 Info.ElementIndex = readVaruint32(Ctx); 748 // Use somewhat unique section name as symbol name. 749 StringRef SectionName = Sections[Info.ElementIndex].Name; 750 Info.Name = SectionName; 751 break; 752 } 753 754 case wasm::WASM_SYMBOL_TYPE_TAG: { 755 Info.ElementIndex = readVaruint32(Ctx); 756 if (!isValidTagIndex(Info.ElementIndex) || 757 IsDefined != isDefinedTagIndex(Info.ElementIndex)) 758 return make_error<GenericBinaryError>("invalid tag symbol index", 759 object_error::parse_failed); 760 if (!IsDefined && (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == 761 wasm::WASM_SYMBOL_BINDING_WEAK) 762 return make_error<GenericBinaryError>("undefined weak global symbol", 763 object_error::parse_failed); 764 if (IsDefined) { 765 Info.Name = readString(Ctx); 766 unsigned TagIndex = Info.ElementIndex - NumImportedTags; 767 wasm::WasmTag &Tag = Tags[TagIndex]; 768 Signature = &Signatures[Tag.SigIndex]; 769 if (Tag.SymbolName.empty()) 770 Tag.SymbolName = Info.Name; 771 772 } else { 773 wasm::WasmImport &Import = *ImportedTags[Info.ElementIndex]; 774 if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) { 775 Info.Name = readString(Ctx); 776 Info.ImportName = Import.Field; 777 } else { 778 Info.Name = Import.Field; 779 } 780 Signature = &Signatures[Import.SigIndex]; 781 Info.ImportModule = Import.Module; 782 } 783 break; 784 } 785 786 default: 787 return make_error<GenericBinaryError>("invalid symbol type: " + 788 Twine(unsigned(Info.Kind)), 789 object_error::parse_failed); 790 } 791 792 if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != 793 wasm::WASM_SYMBOL_BINDING_LOCAL && 794 !SymbolNames.insert(Info.Name).second) 795 return make_error<GenericBinaryError>("duplicate symbol name " + 796 Twine(Info.Name), 797 object_error::parse_failed); 798 LinkingData.SymbolTable.emplace_back(Info); 799 Symbols.emplace_back(LinkingData.SymbolTable.back(), GlobalType, TableType, 800 Signature); 801 LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n"); 802 } 803 804 return Error::success(); 805 } 806 807 Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { 808 uint32_t ComdatCount = readVaruint32(Ctx); 809 StringSet<> ComdatSet; 810 for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { 811 StringRef Name = readString(Ctx); 812 if (Name.empty() || !ComdatSet.insert(Name).second) 813 return make_error<GenericBinaryError>("bad/duplicate COMDAT name " + 814 Twine(Name), 815 object_error::parse_failed); 816 LinkingData.Comdats.emplace_back(Name); 817 uint32_t Flags = readVaruint32(Ctx); 818 if (Flags != 0) 819 return make_error<GenericBinaryError>("unsupported COMDAT flags", 820 object_error::parse_failed); 821 822 uint32_t EntryCount = readVaruint32(Ctx); 823 while (EntryCount--) { 824 unsigned Kind = readVaruint32(Ctx); 825 unsigned Index = readVaruint32(Ctx); 826 switch (Kind) { 827 default: 828 return make_error<GenericBinaryError>("invalid COMDAT entry type", 829 object_error::parse_failed); 830 case wasm::WASM_COMDAT_DATA: 831 if (Index >= DataSegments.size()) 832 return make_error<GenericBinaryError>( 833 "COMDAT data index out of range", object_error::parse_failed); 834 if (DataSegments[Index].Data.Comdat != UINT32_MAX) 835 return make_error<GenericBinaryError>("data segment in two COMDATs", 836 object_error::parse_failed); 837 DataSegments[Index].Data.Comdat = ComdatIndex; 838 break; 839 case wasm::WASM_COMDAT_FUNCTION: 840 if (!isDefinedFunctionIndex(Index)) 841 return make_error<GenericBinaryError>( 842 "COMDAT function index out of range", object_error::parse_failed); 843 if (getDefinedFunction(Index).Comdat != UINT32_MAX) 844 return make_error<GenericBinaryError>("function in two COMDATs", 845 object_error::parse_failed); 846 getDefinedFunction(Index).Comdat = ComdatIndex; 847 break; 848 case wasm::WASM_COMDAT_SECTION: 849 if (Index >= Sections.size()) 850 return make_error<GenericBinaryError>( 851 "COMDAT section index out of range", object_error::parse_failed); 852 if (Sections[Index].Type != wasm::WASM_SEC_CUSTOM) 853 return make_error<GenericBinaryError>( 854 "non-custom section in a COMDAT", object_error::parse_failed); 855 Sections[Index].Comdat = ComdatIndex; 856 break; 857 } 858 } 859 } 860 return Error::success(); 861 } 862 863 Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) { 864 llvm::SmallSet<StringRef, 3> FieldsSeen; 865 uint32_t Fields = readVaruint32(Ctx); 866 for (size_t I = 0; I < Fields; ++I) { 867 StringRef FieldName = readString(Ctx); 868 if (!FieldsSeen.insert(FieldName).second) 869 return make_error<GenericBinaryError>( 870 "producers section does not have unique fields", 871 object_error::parse_failed); 872 std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr; 873 if (FieldName == "language") { 874 ProducerVec = &ProducerInfo.Languages; 875 } else if (FieldName == "processed-by") { 876 ProducerVec = &ProducerInfo.Tools; 877 } else if (FieldName == "sdk") { 878 ProducerVec = &ProducerInfo.SDKs; 879 } else { 880 return make_error<GenericBinaryError>( 881 "producers section field is not named one of language, processed-by, " 882 "or sdk", 883 object_error::parse_failed); 884 } 885 uint32_t ValueCount = readVaruint32(Ctx); 886 llvm::SmallSet<StringRef, 8> ProducersSeen; 887 for (size_t J = 0; J < ValueCount; ++J) { 888 StringRef Name = readString(Ctx); 889 StringRef Version = readString(Ctx); 890 if (!ProducersSeen.insert(Name).second) { 891 return make_error<GenericBinaryError>( 892 "producers section contains repeated producer", 893 object_error::parse_failed); 894 } 895 ProducerVec->emplace_back(std::string(Name), std::string(Version)); 896 } 897 } 898 if (Ctx.Ptr != Ctx.End) 899 return make_error<GenericBinaryError>("producers section ended prematurely", 900 object_error::parse_failed); 901 return Error::success(); 902 } 903 904 Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) { 905 llvm::SmallSet<std::string, 8> FeaturesSeen; 906 uint32_t FeatureCount = readVaruint32(Ctx); 907 for (size_t I = 0; I < FeatureCount; ++I) { 908 wasm::WasmFeatureEntry Feature; 909 Feature.Prefix = readUint8(Ctx); 910 switch (Feature.Prefix) { 911 case wasm::WASM_FEATURE_PREFIX_USED: 912 case wasm::WASM_FEATURE_PREFIX_REQUIRED: 913 case wasm::WASM_FEATURE_PREFIX_DISALLOWED: 914 break; 915 default: 916 return make_error<GenericBinaryError>("unknown feature policy prefix", 917 object_error::parse_failed); 918 } 919 Feature.Name = std::string(readString(Ctx)); 920 if (!FeaturesSeen.insert(Feature.Name).second) 921 return make_error<GenericBinaryError>( 922 "target features section contains repeated feature \"" + 923 Feature.Name + "\"", 924 object_error::parse_failed); 925 TargetFeatures.push_back(Feature); 926 } 927 if (Ctx.Ptr != Ctx.End) 928 return make_error<GenericBinaryError>( 929 "target features section ended prematurely", 930 object_error::parse_failed); 931 return Error::success(); 932 } 933 934 Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { 935 uint32_t SectionIndex = readVaruint32(Ctx); 936 if (SectionIndex >= Sections.size()) 937 return make_error<GenericBinaryError>("invalid section index", 938 object_error::parse_failed); 939 WasmSection &Section = Sections[SectionIndex]; 940 uint32_t RelocCount = readVaruint32(Ctx); 941 uint32_t EndOffset = Section.Content.size(); 942 uint32_t PreviousOffset = 0; 943 while (RelocCount--) { 944 wasm::WasmRelocation Reloc = {}; 945 uint32_t type = readVaruint32(Ctx); 946 Reloc.Type = type; 947 Reloc.Offset = readVaruint32(Ctx); 948 if (Reloc.Offset < PreviousOffset) 949 return make_error<GenericBinaryError>("relocations not in offset order", 950 object_error::parse_failed); 951 PreviousOffset = Reloc.Offset; 952 Reloc.Index = readVaruint32(Ctx); 953 switch (type) { 954 case wasm::R_WASM_FUNCTION_INDEX_LEB: 955 case wasm::R_WASM_FUNCTION_INDEX_I32: 956 case wasm::R_WASM_TABLE_INDEX_SLEB: 957 case wasm::R_WASM_TABLE_INDEX_SLEB64: 958 case wasm::R_WASM_TABLE_INDEX_I32: 959 case wasm::R_WASM_TABLE_INDEX_I64: 960 case wasm::R_WASM_TABLE_INDEX_REL_SLEB: 961 case wasm::R_WASM_TABLE_INDEX_REL_SLEB64: 962 if (!isValidFunctionSymbol(Reloc.Index)) 963 return make_error<GenericBinaryError>( 964 "invalid relocation function index", object_error::parse_failed); 965 break; 966 case wasm::R_WASM_TABLE_NUMBER_LEB: 967 if (!isValidTableSymbol(Reloc.Index)) 968 return make_error<GenericBinaryError>("invalid relocation table index", 969 object_error::parse_failed); 970 break; 971 case wasm::R_WASM_TYPE_INDEX_LEB: 972 if (Reloc.Index >= Signatures.size()) 973 return make_error<GenericBinaryError>("invalid relocation type index", 974 object_error::parse_failed); 975 break; 976 case wasm::R_WASM_GLOBAL_INDEX_LEB: 977 // R_WASM_GLOBAL_INDEX_LEB are can be used against function and data 978 // symbols to refer to their GOT entries. 979 if (!isValidGlobalSymbol(Reloc.Index) && 980 !isValidDataSymbol(Reloc.Index) && 981 !isValidFunctionSymbol(Reloc.Index)) 982 return make_error<GenericBinaryError>("invalid relocation global index", 983 object_error::parse_failed); 984 break; 985 case wasm::R_WASM_GLOBAL_INDEX_I32: 986 if (!isValidGlobalSymbol(Reloc.Index)) 987 return make_error<GenericBinaryError>("invalid relocation global index", 988 object_error::parse_failed); 989 break; 990 case wasm::R_WASM_TAG_INDEX_LEB: 991 if (!isValidTagSymbol(Reloc.Index)) 992 return make_error<GenericBinaryError>("invalid relocation tag index", 993 object_error::parse_failed); 994 break; 995 case wasm::R_WASM_MEMORY_ADDR_LEB: 996 case wasm::R_WASM_MEMORY_ADDR_SLEB: 997 case wasm::R_WASM_MEMORY_ADDR_I32: 998 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB: 999 case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB: 1000 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 1001 if (!isValidDataSymbol(Reloc.Index)) 1002 return make_error<GenericBinaryError>("invalid relocation data index", 1003 object_error::parse_failed); 1004 Reloc.Addend = readVarint32(Ctx); 1005 break; 1006 case wasm::R_WASM_MEMORY_ADDR_LEB64: 1007 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 1008 case wasm::R_WASM_MEMORY_ADDR_I64: 1009 case wasm::R_WASM_MEMORY_ADDR_REL_SLEB64: 1010 case wasm::R_WASM_MEMORY_ADDR_TLS_SLEB64: 1011 if (!isValidDataSymbol(Reloc.Index)) 1012 return make_error<GenericBinaryError>("invalid relocation data index", 1013 object_error::parse_failed); 1014 Reloc.Addend = readVarint64(Ctx); 1015 break; 1016 case wasm::R_WASM_FUNCTION_OFFSET_I32: 1017 if (!isValidFunctionSymbol(Reloc.Index)) 1018 return make_error<GenericBinaryError>( 1019 "invalid relocation function index", object_error::parse_failed); 1020 Reloc.Addend = readVarint32(Ctx); 1021 break; 1022 case wasm::R_WASM_FUNCTION_OFFSET_I64: 1023 if (!isValidFunctionSymbol(Reloc.Index)) 1024 return make_error<GenericBinaryError>( 1025 "invalid relocation function index", object_error::parse_failed); 1026 Reloc.Addend = readVarint64(Ctx); 1027 break; 1028 case wasm::R_WASM_SECTION_OFFSET_I32: 1029 if (!isValidSectionSymbol(Reloc.Index)) 1030 return make_error<GenericBinaryError>( 1031 "invalid relocation section index", object_error::parse_failed); 1032 Reloc.Addend = readVarint32(Ctx); 1033 break; 1034 default: 1035 return make_error<GenericBinaryError>("invalid relocation type: " + 1036 Twine(type), 1037 object_error::parse_failed); 1038 } 1039 1040 // Relocations must fit inside the section, and must appear in order. They 1041 // also shouldn't overlap a function/element boundary, but we don't bother 1042 // to check that. 1043 uint64_t Size = 5; 1044 if (Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LEB64 || 1045 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_SLEB64 || 1046 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_REL_SLEB64) 1047 Size = 10; 1048 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I32 || 1049 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I32 || 1050 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_LOCREL_I32 || 1051 Reloc.Type == wasm::R_WASM_SECTION_OFFSET_I32 || 1052 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I32 || 1053 Reloc.Type == wasm::R_WASM_FUNCTION_INDEX_I32 || 1054 Reloc.Type == wasm::R_WASM_GLOBAL_INDEX_I32) 1055 Size = 4; 1056 if (Reloc.Type == wasm::R_WASM_TABLE_INDEX_I64 || 1057 Reloc.Type == wasm::R_WASM_MEMORY_ADDR_I64 || 1058 Reloc.Type == wasm::R_WASM_FUNCTION_OFFSET_I64) 1059 Size = 8; 1060 if (Reloc.Offset + Size > EndOffset) 1061 return make_error<GenericBinaryError>("invalid relocation offset", 1062 object_error::parse_failed); 1063 1064 Section.Relocations.push_back(Reloc); 1065 } 1066 if (Ctx.Ptr != Ctx.End) 1067 return make_error<GenericBinaryError>("reloc section ended prematurely", 1068 object_error::parse_failed); 1069 return Error::success(); 1070 } 1071 1072 Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { 1073 if (Sec.Name == "dylink") { 1074 if (Error Err = parseDylinkSection(Ctx)) 1075 return Err; 1076 } else if (Sec.Name == "dylink.0") { 1077 if (Error Err = parseDylink0Section(Ctx)) 1078 return Err; 1079 } else if (Sec.Name == "name") { 1080 if (Error Err = parseNameSection(Ctx)) 1081 return Err; 1082 } else if (Sec.Name == "linking") { 1083 if (Error Err = parseLinkingSection(Ctx)) 1084 return Err; 1085 } else if (Sec.Name == "producers") { 1086 if (Error Err = parseProducersSection(Ctx)) 1087 return Err; 1088 } else if (Sec.Name == "target_features") { 1089 if (Error Err = parseTargetFeaturesSection(Ctx)) 1090 return Err; 1091 } else if (Sec.Name.startswith("reloc.")) { 1092 if (Error Err = parseRelocSection(Sec.Name, Ctx)) 1093 return Err; 1094 } 1095 return Error::success(); 1096 } 1097 1098 Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { 1099 uint32_t Count = readVaruint32(Ctx); 1100 Signatures.reserve(Count); 1101 while (Count--) { 1102 wasm::WasmSignature Sig; 1103 uint8_t Form = readUint8(Ctx); 1104 if (Form != wasm::WASM_TYPE_FUNC) { 1105 return make_error<GenericBinaryError>("invalid signature type", 1106 object_error::parse_failed); 1107 } 1108 uint32_t ParamCount = readVaruint32(Ctx); 1109 Sig.Params.reserve(ParamCount); 1110 while (ParamCount--) { 1111 uint32_t ParamType = readUint8(Ctx); 1112 Sig.Params.push_back(wasm::ValType(ParamType)); 1113 } 1114 uint32_t ReturnCount = readVaruint32(Ctx); 1115 while (ReturnCount--) { 1116 uint32_t ReturnType = readUint8(Ctx); 1117 Sig.Returns.push_back(wasm::ValType(ReturnType)); 1118 } 1119 Signatures.push_back(std::move(Sig)); 1120 } 1121 if (Ctx.Ptr != Ctx.End) 1122 return make_error<GenericBinaryError>("type section ended prematurely", 1123 object_error::parse_failed); 1124 return Error::success(); 1125 } 1126 1127 Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { 1128 uint32_t Count = readVaruint32(Ctx); 1129 uint32_t NumTypes = Signatures.size(); 1130 Imports.reserve(Count); 1131 for (uint32_t I = 0; I < Count; I++) { 1132 wasm::WasmImport Im; 1133 Im.Module = readString(Ctx); 1134 Im.Field = readString(Ctx); 1135 Im.Kind = readUint8(Ctx); 1136 switch (Im.Kind) { 1137 case wasm::WASM_EXTERNAL_FUNCTION: 1138 NumImportedFunctions++; 1139 Im.SigIndex = readVaruint32(Ctx); 1140 if (Im.SigIndex >= NumTypes) 1141 return make_error<GenericBinaryError>("invalid function type", 1142 object_error::parse_failed); 1143 break; 1144 case wasm::WASM_EXTERNAL_GLOBAL: 1145 NumImportedGlobals++; 1146 Im.Global.Type = readUint8(Ctx); 1147 Im.Global.Mutable = readVaruint1(Ctx); 1148 break; 1149 case wasm::WASM_EXTERNAL_MEMORY: 1150 Im.Memory = readLimits(Ctx); 1151 if (Im.Memory.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1152 HasMemory64 = true; 1153 break; 1154 case wasm::WASM_EXTERNAL_TABLE: { 1155 Im.Table = readTableType(Ctx); 1156 NumImportedTables++; 1157 auto ElemType = Im.Table.ElemType; 1158 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1159 ElemType != wasm::WASM_TYPE_EXTERNREF) 1160 return make_error<GenericBinaryError>("invalid table element type", 1161 object_error::parse_failed); 1162 break; 1163 } 1164 case wasm::WASM_EXTERNAL_TAG: 1165 NumImportedTags++; 1166 if (readUint8(Ctx) != 0) // Reserved 'attribute' field 1167 return make_error<GenericBinaryError>("invalid attribute", 1168 object_error::parse_failed); 1169 Im.SigIndex = readVaruint32(Ctx); 1170 if (Im.SigIndex >= NumTypes) 1171 return make_error<GenericBinaryError>("invalid tag type", 1172 object_error::parse_failed); 1173 break; 1174 default: 1175 return make_error<GenericBinaryError>("unexpected import kind", 1176 object_error::parse_failed); 1177 } 1178 Imports.push_back(Im); 1179 } 1180 if (Ctx.Ptr != Ctx.End) 1181 return make_error<GenericBinaryError>("import section ended prematurely", 1182 object_error::parse_failed); 1183 return Error::success(); 1184 } 1185 1186 Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { 1187 uint32_t Count = readVaruint32(Ctx); 1188 Functions.reserve(Count); 1189 uint32_t NumTypes = Signatures.size(); 1190 while (Count--) { 1191 uint32_t Type = readVaruint32(Ctx); 1192 if (Type >= NumTypes) 1193 return make_error<GenericBinaryError>("invalid function type", 1194 object_error::parse_failed); 1195 wasm::WasmFunction F; 1196 F.SigIndex = Type; 1197 Functions.push_back(F); 1198 } 1199 if (Ctx.Ptr != Ctx.End) 1200 return make_error<GenericBinaryError>("function section ended prematurely", 1201 object_error::parse_failed); 1202 return Error::success(); 1203 } 1204 1205 Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { 1206 TableSection = Sections.size(); 1207 uint32_t Count = readVaruint32(Ctx); 1208 Tables.reserve(Count); 1209 while (Count--) { 1210 wasm::WasmTable T; 1211 T.Type = readTableType(Ctx); 1212 T.Index = NumImportedTables + Tables.size(); 1213 Tables.push_back(T); 1214 auto ElemType = Tables.back().Type.ElemType; 1215 if (ElemType != wasm::WASM_TYPE_FUNCREF && 1216 ElemType != wasm::WASM_TYPE_EXTERNREF) { 1217 return make_error<GenericBinaryError>("invalid table element type", 1218 object_error::parse_failed); 1219 } 1220 } 1221 if (Ctx.Ptr != Ctx.End) 1222 return make_error<GenericBinaryError>("table section ended prematurely", 1223 object_error::parse_failed); 1224 return Error::success(); 1225 } 1226 1227 Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { 1228 uint32_t Count = readVaruint32(Ctx); 1229 Memories.reserve(Count); 1230 while (Count--) { 1231 auto Limits = readLimits(Ctx); 1232 if (Limits.Flags & wasm::WASM_LIMITS_FLAG_IS_64) 1233 HasMemory64 = true; 1234 Memories.push_back(Limits); 1235 } 1236 if (Ctx.Ptr != Ctx.End) 1237 return make_error<GenericBinaryError>("memory section ended prematurely", 1238 object_error::parse_failed); 1239 return Error::success(); 1240 } 1241 1242 Error WasmObjectFile::parseTagSection(ReadContext &Ctx) { 1243 TagSection = Sections.size(); 1244 uint32_t Count = readVaruint32(Ctx); 1245 Tags.reserve(Count); 1246 uint32_t NumTypes = Signatures.size(); 1247 while (Count--) { 1248 if (readUint8(Ctx) != 0) // Reserved 'attribute' field 1249 return make_error<GenericBinaryError>("invalid attribute", 1250 object_error::parse_failed); 1251 uint32_t Type = readVaruint32(Ctx); 1252 if (Type >= NumTypes) 1253 return make_error<GenericBinaryError>("invalid tag type", 1254 object_error::parse_failed); 1255 wasm::WasmTag Tag; 1256 Tag.Index = NumImportedTags + Tags.size(); 1257 Tag.SigIndex = Type; 1258 Tags.push_back(Tag); 1259 } 1260 1261 if (Ctx.Ptr != Ctx.End) 1262 return make_error<GenericBinaryError>("tag section ended prematurely", 1263 object_error::parse_failed); 1264 return Error::success(); 1265 } 1266 1267 Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { 1268 GlobalSection = Sections.size(); 1269 uint32_t Count = readVaruint32(Ctx); 1270 Globals.reserve(Count); 1271 while (Count--) { 1272 wasm::WasmGlobal Global; 1273 Global.Index = NumImportedGlobals + Globals.size(); 1274 Global.Type.Type = readUint8(Ctx); 1275 Global.Type.Mutable = readVaruint1(Ctx); 1276 if (Error Err = readInitExpr(Global.InitExpr, Ctx)) 1277 return Err; 1278 Globals.push_back(Global); 1279 } 1280 if (Ctx.Ptr != Ctx.End) 1281 return make_error<GenericBinaryError>("global section ended prematurely", 1282 object_error::parse_failed); 1283 return Error::success(); 1284 } 1285 1286 Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { 1287 uint32_t Count = readVaruint32(Ctx); 1288 Exports.reserve(Count); 1289 for (uint32_t I = 0; I < Count; I++) { 1290 wasm::WasmExport Ex; 1291 Ex.Name = readString(Ctx); 1292 Ex.Kind = readUint8(Ctx); 1293 Ex.Index = readVaruint32(Ctx); 1294 switch (Ex.Kind) { 1295 case wasm::WASM_EXTERNAL_FUNCTION: 1296 1297 if (!isDefinedFunctionIndex(Ex.Index)) 1298 return make_error<GenericBinaryError>("invalid function export", 1299 object_error::parse_failed); 1300 getDefinedFunction(Ex.Index).ExportName = Ex.Name; 1301 break; 1302 case wasm::WASM_EXTERNAL_GLOBAL: 1303 if (!isValidGlobalIndex(Ex.Index)) 1304 return make_error<GenericBinaryError>("invalid global export", 1305 object_error::parse_failed); 1306 break; 1307 case wasm::WASM_EXTERNAL_TAG: 1308 if (!isValidTagIndex(Ex.Index)) 1309 return make_error<GenericBinaryError>("invalid tag export", 1310 object_error::parse_failed); 1311 break; 1312 case wasm::WASM_EXTERNAL_MEMORY: 1313 case wasm::WASM_EXTERNAL_TABLE: 1314 break; 1315 default: 1316 return make_error<GenericBinaryError>("unexpected export kind", 1317 object_error::parse_failed); 1318 } 1319 Exports.push_back(Ex); 1320 } 1321 if (Ctx.Ptr != Ctx.End) 1322 return make_error<GenericBinaryError>("export section ended prematurely", 1323 object_error::parse_failed); 1324 return Error::success(); 1325 } 1326 1327 bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { 1328 return Index < NumImportedFunctions + Functions.size(); 1329 } 1330 1331 bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { 1332 return Index >= NumImportedFunctions && isValidFunctionIndex(Index); 1333 } 1334 1335 bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { 1336 return Index < NumImportedGlobals + Globals.size(); 1337 } 1338 1339 bool WasmObjectFile::isValidTableNumber(uint32_t Index) const { 1340 return Index < NumImportedTables + Tables.size(); 1341 } 1342 1343 bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { 1344 return Index >= NumImportedGlobals && isValidGlobalIndex(Index); 1345 } 1346 1347 bool WasmObjectFile::isDefinedTableNumber(uint32_t Index) const { 1348 return Index >= NumImportedTables && isValidTableNumber(Index); 1349 } 1350 1351 bool WasmObjectFile::isValidTagIndex(uint32_t Index) const { 1352 return Index < NumImportedTags + Tags.size(); 1353 } 1354 1355 bool WasmObjectFile::isDefinedTagIndex(uint32_t Index) const { 1356 return Index >= NumImportedTags && isValidTagIndex(Index); 1357 } 1358 1359 bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { 1360 return Index < Symbols.size() && Symbols[Index].isTypeFunction(); 1361 } 1362 1363 bool WasmObjectFile::isValidTableSymbol(uint32_t Index) const { 1364 return Index < Symbols.size() && Symbols[Index].isTypeTable(); 1365 } 1366 1367 bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { 1368 return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); 1369 } 1370 1371 bool WasmObjectFile::isValidTagSymbol(uint32_t Index) const { 1372 return Index < Symbols.size() && Symbols[Index].isTypeTag(); 1373 } 1374 1375 bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { 1376 return Index < Symbols.size() && Symbols[Index].isTypeData(); 1377 } 1378 1379 bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { 1380 return Index < Symbols.size() && Symbols[Index].isTypeSection(); 1381 } 1382 1383 wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { 1384 assert(isDefinedFunctionIndex(Index)); 1385 return Functions[Index - NumImportedFunctions]; 1386 } 1387 1388 const wasm::WasmFunction & 1389 WasmObjectFile::getDefinedFunction(uint32_t Index) const { 1390 assert(isDefinedFunctionIndex(Index)); 1391 return Functions[Index - NumImportedFunctions]; 1392 } 1393 1394 wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) { 1395 assert(isDefinedGlobalIndex(Index)); 1396 return Globals[Index - NumImportedGlobals]; 1397 } 1398 1399 wasm::WasmTag &WasmObjectFile::getDefinedTag(uint32_t Index) { 1400 assert(isDefinedTagIndex(Index)); 1401 return Tags[Index - NumImportedTags]; 1402 } 1403 1404 Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { 1405 StartFunction = readVaruint32(Ctx); 1406 if (!isValidFunctionIndex(StartFunction)) 1407 return make_error<GenericBinaryError>("invalid start function", 1408 object_error::parse_failed); 1409 return Error::success(); 1410 } 1411 1412 Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { 1413 CodeSection = Sections.size(); 1414 uint32_t FunctionCount = readVaruint32(Ctx); 1415 if (FunctionCount != Functions.size()) { 1416 return make_error<GenericBinaryError>("invalid function count", 1417 object_error::parse_failed); 1418 } 1419 1420 for (uint32_t i = 0; i < FunctionCount; i++) { 1421 wasm::WasmFunction& Function = Functions[i]; 1422 const uint8_t *FunctionStart = Ctx.Ptr; 1423 uint32_t Size = readVaruint32(Ctx); 1424 const uint8_t *FunctionEnd = Ctx.Ptr + Size; 1425 1426 Function.CodeOffset = Ctx.Ptr - FunctionStart; 1427 Function.Index = NumImportedFunctions + i; 1428 Function.CodeSectionOffset = FunctionStart - Ctx.Start; 1429 Function.Size = FunctionEnd - FunctionStart; 1430 1431 uint32_t NumLocalDecls = readVaruint32(Ctx); 1432 Function.Locals.reserve(NumLocalDecls); 1433 while (NumLocalDecls--) { 1434 wasm::WasmLocalDecl Decl; 1435 Decl.Count = readVaruint32(Ctx); 1436 Decl.Type = readUint8(Ctx); 1437 Function.Locals.push_back(Decl); 1438 } 1439 1440 uint32_t BodySize = FunctionEnd - Ctx.Ptr; 1441 Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); 1442 // This will be set later when reading in the linking metadata section. 1443 Function.Comdat = UINT32_MAX; 1444 Ctx.Ptr += BodySize; 1445 assert(Ctx.Ptr == FunctionEnd); 1446 } 1447 if (Ctx.Ptr != Ctx.End) 1448 return make_error<GenericBinaryError>("code section ended prematurely", 1449 object_error::parse_failed); 1450 return Error::success(); 1451 } 1452 1453 Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { 1454 uint32_t Count = readVaruint32(Ctx); 1455 ElemSegments.reserve(Count); 1456 while (Count--) { 1457 wasm::WasmElemSegment Segment; 1458 Segment.Flags = readVaruint32(Ctx); 1459 1460 uint32_t SupportedFlags = wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER | 1461 wasm::WASM_ELEM_SEGMENT_IS_PASSIVE | 1462 wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS; 1463 if (Segment.Flags & ~SupportedFlags) 1464 return make_error<GenericBinaryError>( 1465 "Unsupported flags for element segment", object_error::parse_failed); 1466 1467 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_TABLE_NUMBER) 1468 Segment.TableNumber = readVaruint32(Ctx); 1469 else 1470 Segment.TableNumber = 0; 1471 if (!isValidTableNumber(Segment.TableNumber)) 1472 return make_error<GenericBinaryError>("invalid TableNumber", 1473 object_error::parse_failed); 1474 1475 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_IS_PASSIVE) { 1476 Segment.Offset.Extended = false; 1477 Segment.Offset.Inst.Opcode = wasm::WASM_OPCODE_I32_CONST; 1478 Segment.Offset.Inst.Value.Int32 = 0; 1479 } else { 1480 if (Error Err = readInitExpr(Segment.Offset, Ctx)) 1481 return Err; 1482 } 1483 1484 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_MASK_HAS_ELEM_KIND) { 1485 Segment.ElemKind = readUint8(Ctx); 1486 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) { 1487 if (Segment.ElemKind != uint8_t(wasm::ValType::FUNCREF) && 1488 Segment.ElemKind != uint8_t(wasm::ValType::EXTERNREF)) { 1489 return make_error<GenericBinaryError>("invalid reference type", 1490 object_error::parse_failed); 1491 } 1492 } else { 1493 if (Segment.ElemKind != 0) 1494 return make_error<GenericBinaryError>("invalid elemtype", 1495 object_error::parse_failed); 1496 Segment.ElemKind = uint8_t(wasm::ValType::FUNCREF); 1497 } 1498 } else { 1499 Segment.ElemKind = uint8_t(wasm::ValType::FUNCREF); 1500 } 1501 1502 if (Segment.Flags & wasm::WASM_ELEM_SEGMENT_HAS_INIT_EXPRS) 1503 return make_error<GenericBinaryError>( 1504 "elem segment init expressions not yet implemented", 1505 object_error::parse_failed); 1506 1507 uint32_t NumElems = readVaruint32(Ctx); 1508 while (NumElems--) { 1509 Segment.Functions.push_back(readVaruint32(Ctx)); 1510 } 1511 ElemSegments.push_back(Segment); 1512 } 1513 if (Ctx.Ptr != Ctx.End) 1514 return make_error<GenericBinaryError>("elem section ended prematurely", 1515 object_error::parse_failed); 1516 return Error::success(); 1517 } 1518 1519 Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { 1520 DataSection = Sections.size(); 1521 uint32_t Count = readVaruint32(Ctx); 1522 if (DataCount && Count != *DataCount) 1523 return make_error<GenericBinaryError>( 1524 "number of data segments does not match DataCount section"); 1525 DataSegments.reserve(Count); 1526 while (Count--) { 1527 WasmSegment Segment; 1528 Segment.Data.InitFlags = readVaruint32(Ctx); 1529 Segment.Data.MemoryIndex = 1530 (Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_HAS_MEMINDEX) 1531 ? readVaruint32(Ctx) 1532 : 0; 1533 if ((Segment.Data.InitFlags & wasm::WASM_DATA_SEGMENT_IS_PASSIVE) == 0) { 1534 if (Error Err = readInitExpr(Segment.Data.Offset, Ctx)) 1535 return Err; 1536 } else { 1537 Segment.Data.Offset.Extended = false; 1538 Segment.Data.Offset.Inst.Opcode = wasm::WASM_OPCODE_I32_CONST; 1539 Segment.Data.Offset.Inst.Value.Int32 = 0; 1540 } 1541 uint32_t Size = readVaruint32(Ctx); 1542 if (Size > (size_t)(Ctx.End - Ctx.Ptr)) 1543 return make_error<GenericBinaryError>("invalid segment size", 1544 object_error::parse_failed); 1545 Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); 1546 // The rest of these Data fields are set later, when reading in the linking 1547 // metadata section. 1548 Segment.Data.Alignment = 0; 1549 Segment.Data.LinkingFlags = 0; 1550 Segment.Data.Comdat = UINT32_MAX; 1551 Segment.SectionOffset = Ctx.Ptr - Ctx.Start; 1552 Ctx.Ptr += Size; 1553 DataSegments.push_back(Segment); 1554 } 1555 if (Ctx.Ptr != Ctx.End) 1556 return make_error<GenericBinaryError>("data section ended prematurely", 1557 object_error::parse_failed); 1558 return Error::success(); 1559 } 1560 1561 Error WasmObjectFile::parseDataCountSection(ReadContext &Ctx) { 1562 DataCount = readVaruint32(Ctx); 1563 return Error::success(); 1564 } 1565 1566 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { 1567 return Header; 1568 } 1569 1570 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.b++; } 1571 1572 Expected<uint32_t> WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { 1573 uint32_t Result = SymbolRef::SF_None; 1574 const WasmSymbol &Sym = getWasmSymbol(Symb); 1575 1576 LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); 1577 if (Sym.isBindingWeak()) 1578 Result |= SymbolRef::SF_Weak; 1579 if (!Sym.isBindingLocal()) 1580 Result |= SymbolRef::SF_Global; 1581 if (Sym.isHidden()) 1582 Result |= SymbolRef::SF_Hidden; 1583 if (!Sym.isDefined()) 1584 Result |= SymbolRef::SF_Undefined; 1585 if (Sym.isTypeFunction()) 1586 Result |= SymbolRef::SF_Executable; 1587 return Result; 1588 } 1589 1590 basic_symbol_iterator WasmObjectFile::symbol_begin() const { 1591 DataRefImpl Ref; 1592 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1593 Ref.d.b = 0; // Symbol index 1594 return BasicSymbolRef(Ref, this); 1595 } 1596 1597 basic_symbol_iterator WasmObjectFile::symbol_end() const { 1598 DataRefImpl Ref; 1599 Ref.d.a = 1; // Arbitrary non-zero value so that Ref.p is non-null 1600 Ref.d.b = Symbols.size(); // Symbol index 1601 return BasicSymbolRef(Ref, this); 1602 } 1603 1604 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { 1605 return Symbols[Symb.d.b]; 1606 } 1607 1608 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { 1609 return getWasmSymbol(Symb.getRawDataRefImpl()); 1610 } 1611 1612 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { 1613 return getWasmSymbol(Symb).Info.Name; 1614 } 1615 1616 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { 1617 auto &Sym = getWasmSymbol(Symb); 1618 if (Sym.Info.Kind == wasm::WASM_SYMBOL_TYPE_FUNCTION && 1619 isDefinedFunctionIndex(Sym.Info.ElementIndex)) 1620 return getDefinedFunction(Sym.Info.ElementIndex).CodeSectionOffset; 1621 else 1622 return getSymbolValue(Symb); 1623 } 1624 1625 uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol &Sym) const { 1626 switch (Sym.Info.Kind) { 1627 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1628 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1629 case wasm::WASM_SYMBOL_TYPE_TAG: 1630 case wasm::WASM_SYMBOL_TYPE_TABLE: 1631 return Sym.Info.ElementIndex; 1632 case wasm::WASM_SYMBOL_TYPE_DATA: { 1633 // The value of a data symbol is the segment offset, plus the symbol 1634 // offset within the segment. 1635 uint32_t SegmentIndex = Sym.Info.DataRef.Segment; 1636 const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; 1637 if (Segment.Offset.Extended) { 1638 llvm_unreachable("extended init exprs not supported"); 1639 } else if (Segment.Offset.Inst.Opcode == wasm::WASM_OPCODE_I32_CONST) { 1640 return Segment.Offset.Inst.Value.Int32 + Sym.Info.DataRef.Offset; 1641 } else if (Segment.Offset.Inst.Opcode == wasm::WASM_OPCODE_I64_CONST) { 1642 return Segment.Offset.Inst.Value.Int64 + Sym.Info.DataRef.Offset; 1643 } else { 1644 llvm_unreachable("unknown init expr opcode"); 1645 } 1646 } 1647 case wasm::WASM_SYMBOL_TYPE_SECTION: 1648 return 0; 1649 } 1650 llvm_unreachable("invalid symbol type"); 1651 } 1652 1653 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { 1654 return getWasmSymbolValue(getWasmSymbol(Symb)); 1655 } 1656 1657 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { 1658 llvm_unreachable("not yet implemented"); 1659 return 0; 1660 } 1661 1662 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { 1663 llvm_unreachable("not yet implemented"); 1664 return 0; 1665 } 1666 1667 Expected<SymbolRef::Type> 1668 WasmObjectFile::getSymbolType(DataRefImpl Symb) const { 1669 const WasmSymbol &Sym = getWasmSymbol(Symb); 1670 1671 switch (Sym.Info.Kind) { 1672 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1673 return SymbolRef::ST_Function; 1674 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1675 return SymbolRef::ST_Other; 1676 case wasm::WASM_SYMBOL_TYPE_DATA: 1677 return SymbolRef::ST_Data; 1678 case wasm::WASM_SYMBOL_TYPE_SECTION: 1679 return SymbolRef::ST_Debug; 1680 case wasm::WASM_SYMBOL_TYPE_TAG: 1681 return SymbolRef::ST_Other; 1682 case wasm::WASM_SYMBOL_TYPE_TABLE: 1683 return SymbolRef::ST_Other; 1684 } 1685 1686 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1687 return SymbolRef::ST_Other; 1688 } 1689 1690 Expected<section_iterator> 1691 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { 1692 const WasmSymbol &Sym = getWasmSymbol(Symb); 1693 if (Sym.isUndefined()) 1694 return section_end(); 1695 1696 DataRefImpl Ref; 1697 Ref.d.a = getSymbolSectionIdImpl(Sym); 1698 return section_iterator(SectionRef(Ref, this)); 1699 } 1700 1701 uint32_t WasmObjectFile::getSymbolSectionId(SymbolRef Symb) const { 1702 const WasmSymbol &Sym = getWasmSymbol(Symb); 1703 return getSymbolSectionIdImpl(Sym); 1704 } 1705 1706 uint32_t WasmObjectFile::getSymbolSectionIdImpl(const WasmSymbol &Sym) const { 1707 switch (Sym.Info.Kind) { 1708 case wasm::WASM_SYMBOL_TYPE_FUNCTION: 1709 return CodeSection; 1710 case wasm::WASM_SYMBOL_TYPE_GLOBAL: 1711 return GlobalSection; 1712 case wasm::WASM_SYMBOL_TYPE_DATA: 1713 return DataSection; 1714 case wasm::WASM_SYMBOL_TYPE_SECTION: 1715 return Sym.Info.ElementIndex; 1716 case wasm::WASM_SYMBOL_TYPE_TAG: 1717 return TagSection; 1718 case wasm::WASM_SYMBOL_TYPE_TABLE: 1719 return TableSection; 1720 default: 1721 llvm_unreachable("unknown WasmSymbol::SymbolType"); 1722 } 1723 } 1724 1725 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } 1726 1727 Expected<StringRef> WasmObjectFile::getSectionName(DataRefImpl Sec) const { 1728 const WasmSection &S = Sections[Sec.d.a]; 1729 if (S.Type == wasm::WASM_SEC_CUSTOM) 1730 return S.Name; 1731 if (S.Type > wasm::WASM_SEC_LAST_KNOWN) 1732 return createStringError(object_error::invalid_section_index, ""); 1733 return wasm::sectionTypeToString(S.Type); 1734 } 1735 1736 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; } 1737 1738 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { 1739 return Sec.d.a; 1740 } 1741 1742 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { 1743 const WasmSection &S = Sections[Sec.d.a]; 1744 return S.Content.size(); 1745 } 1746 1747 Expected<ArrayRef<uint8_t>> 1748 WasmObjectFile::getSectionContents(DataRefImpl Sec) const { 1749 const WasmSection &S = Sections[Sec.d.a]; 1750 // This will never fail since wasm sections can never be empty (user-sections 1751 // must have a name and non-user sections each have a defined structure). 1752 return S.Content; 1753 } 1754 1755 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { 1756 return 1; 1757 } 1758 1759 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { 1760 return false; 1761 } 1762 1763 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { 1764 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE; 1765 } 1766 1767 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { 1768 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA; 1769 } 1770 1771 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } 1772 1773 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } 1774 1775 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { 1776 DataRefImpl RelocRef; 1777 RelocRef.d.a = Ref.d.a; 1778 RelocRef.d.b = 0; 1779 return relocation_iterator(RelocationRef(RelocRef, this)); 1780 } 1781 1782 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { 1783 const WasmSection &Sec = getWasmSection(Ref); 1784 DataRefImpl RelocRef; 1785 RelocRef.d.a = Ref.d.a; 1786 RelocRef.d.b = Sec.Relocations.size(); 1787 return relocation_iterator(RelocationRef(RelocRef, this)); 1788 } 1789 1790 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { Rel.d.b++; } 1791 1792 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { 1793 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1794 return Rel.Offset; 1795 } 1796 1797 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { 1798 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1799 if (Rel.Type == wasm::R_WASM_TYPE_INDEX_LEB) 1800 return symbol_end(); 1801 DataRefImpl Sym; 1802 Sym.d.a = 1; 1803 Sym.d.b = Rel.Index; 1804 return symbol_iterator(SymbolRef(Sym, this)); 1805 } 1806 1807 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { 1808 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1809 return Rel.Type; 1810 } 1811 1812 void WasmObjectFile::getRelocationTypeName( 1813 DataRefImpl Ref, SmallVectorImpl<char> &Result) const { 1814 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); 1815 StringRef Res = "Unknown"; 1816 1817 #define WASM_RELOC(name, value) \ 1818 case wasm::name: \ 1819 Res = #name; \ 1820 break; 1821 1822 switch (Rel.Type) { 1823 #include "llvm/BinaryFormat/WasmRelocs.def" 1824 } 1825 1826 #undef WASM_RELOC 1827 1828 Result.append(Res.begin(), Res.end()); 1829 } 1830 1831 section_iterator WasmObjectFile::section_begin() const { 1832 DataRefImpl Ref; 1833 Ref.d.a = 0; 1834 return section_iterator(SectionRef(Ref, this)); 1835 } 1836 1837 section_iterator WasmObjectFile::section_end() const { 1838 DataRefImpl Ref; 1839 Ref.d.a = Sections.size(); 1840 return section_iterator(SectionRef(Ref, this)); 1841 } 1842 1843 uint8_t WasmObjectFile::getBytesInAddress() const { 1844 return HasMemory64 ? 8 : 4; 1845 } 1846 1847 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } 1848 1849 Triple::ArchType WasmObjectFile::getArch() const { 1850 return HasMemory64 ? Triple::wasm64 : Triple::wasm32; 1851 } 1852 1853 Expected<SubtargetFeatures> WasmObjectFile::getFeatures() const { 1854 return SubtargetFeatures(); 1855 } 1856 1857 bool WasmObjectFile::isRelocatableObject() const { return HasLinkingSection; } 1858 1859 bool WasmObjectFile::isSharedObject() const { return HasDylinkSection; } 1860 1861 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { 1862 assert(Ref.d.a < Sections.size()); 1863 return Sections[Ref.d.a]; 1864 } 1865 1866 const WasmSection & 1867 WasmObjectFile::getWasmSection(const SectionRef &Section) const { 1868 return getWasmSection(Section.getRawDataRefImpl()); 1869 } 1870 1871 const wasm::WasmRelocation & 1872 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { 1873 return getWasmRelocation(Ref.getRawDataRefImpl()); 1874 } 1875 1876 const wasm::WasmRelocation & 1877 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { 1878 assert(Ref.d.a < Sections.size()); 1879 const WasmSection &Sec = Sections[Ref.d.a]; 1880 assert(Ref.d.b < Sec.Relocations.size()); 1881 return Sec.Relocations[Ref.d.b]; 1882 } 1883 1884 int WasmSectionOrderChecker::getSectionOrder(unsigned ID, 1885 StringRef CustomSectionName) { 1886 switch (ID) { 1887 case wasm::WASM_SEC_CUSTOM: 1888 return StringSwitch<unsigned>(CustomSectionName) 1889 .Case("dylink", WASM_SEC_ORDER_DYLINK) 1890 .Case("dylink.0", WASM_SEC_ORDER_DYLINK) 1891 .Case("linking", WASM_SEC_ORDER_LINKING) 1892 .StartsWith("reloc.", WASM_SEC_ORDER_RELOC) 1893 .Case("name", WASM_SEC_ORDER_NAME) 1894 .Case("producers", WASM_SEC_ORDER_PRODUCERS) 1895 .Case("target_features", WASM_SEC_ORDER_TARGET_FEATURES) 1896 .Default(WASM_SEC_ORDER_NONE); 1897 case wasm::WASM_SEC_TYPE: 1898 return WASM_SEC_ORDER_TYPE; 1899 case wasm::WASM_SEC_IMPORT: 1900 return WASM_SEC_ORDER_IMPORT; 1901 case wasm::WASM_SEC_FUNCTION: 1902 return WASM_SEC_ORDER_FUNCTION; 1903 case wasm::WASM_SEC_TABLE: 1904 return WASM_SEC_ORDER_TABLE; 1905 case wasm::WASM_SEC_MEMORY: 1906 return WASM_SEC_ORDER_MEMORY; 1907 case wasm::WASM_SEC_GLOBAL: 1908 return WASM_SEC_ORDER_GLOBAL; 1909 case wasm::WASM_SEC_EXPORT: 1910 return WASM_SEC_ORDER_EXPORT; 1911 case wasm::WASM_SEC_START: 1912 return WASM_SEC_ORDER_START; 1913 case wasm::WASM_SEC_ELEM: 1914 return WASM_SEC_ORDER_ELEM; 1915 case wasm::WASM_SEC_CODE: 1916 return WASM_SEC_ORDER_CODE; 1917 case wasm::WASM_SEC_DATA: 1918 return WASM_SEC_ORDER_DATA; 1919 case wasm::WASM_SEC_DATACOUNT: 1920 return WASM_SEC_ORDER_DATACOUNT; 1921 case wasm::WASM_SEC_TAG: 1922 return WASM_SEC_ORDER_TAG; 1923 default: 1924 return WASM_SEC_ORDER_NONE; 1925 } 1926 } 1927 1928 // Represents the edges in a directed graph where any node B reachable from node 1929 // A is not allowed to appear before A in the section ordering, but may appear 1930 // afterward. 1931 int WasmSectionOrderChecker::DisallowedPredecessors 1932 [WASM_NUM_SEC_ORDERS][WASM_NUM_SEC_ORDERS] = { 1933 // WASM_SEC_ORDER_NONE 1934 {}, 1935 // WASM_SEC_ORDER_TYPE 1936 {WASM_SEC_ORDER_TYPE, WASM_SEC_ORDER_IMPORT}, 1937 // WASM_SEC_ORDER_IMPORT 1938 {WASM_SEC_ORDER_IMPORT, WASM_SEC_ORDER_FUNCTION}, 1939 // WASM_SEC_ORDER_FUNCTION 1940 {WASM_SEC_ORDER_FUNCTION, WASM_SEC_ORDER_TABLE}, 1941 // WASM_SEC_ORDER_TABLE 1942 {WASM_SEC_ORDER_TABLE, WASM_SEC_ORDER_MEMORY}, 1943 // WASM_SEC_ORDER_MEMORY 1944 {WASM_SEC_ORDER_MEMORY, WASM_SEC_ORDER_TAG}, 1945 // WASM_SEC_ORDER_TAG 1946 {WASM_SEC_ORDER_TAG, WASM_SEC_ORDER_GLOBAL}, 1947 // WASM_SEC_ORDER_GLOBAL 1948 {WASM_SEC_ORDER_GLOBAL, WASM_SEC_ORDER_EXPORT}, 1949 // WASM_SEC_ORDER_EXPORT 1950 {WASM_SEC_ORDER_EXPORT, WASM_SEC_ORDER_START}, 1951 // WASM_SEC_ORDER_START 1952 {WASM_SEC_ORDER_START, WASM_SEC_ORDER_ELEM}, 1953 // WASM_SEC_ORDER_ELEM 1954 {WASM_SEC_ORDER_ELEM, WASM_SEC_ORDER_DATACOUNT}, 1955 // WASM_SEC_ORDER_DATACOUNT 1956 {WASM_SEC_ORDER_DATACOUNT, WASM_SEC_ORDER_CODE}, 1957 // WASM_SEC_ORDER_CODE 1958 {WASM_SEC_ORDER_CODE, WASM_SEC_ORDER_DATA}, 1959 // WASM_SEC_ORDER_DATA 1960 {WASM_SEC_ORDER_DATA, WASM_SEC_ORDER_LINKING}, 1961 1962 // Custom Sections 1963 // WASM_SEC_ORDER_DYLINK 1964 {WASM_SEC_ORDER_DYLINK, WASM_SEC_ORDER_TYPE}, 1965 // WASM_SEC_ORDER_LINKING 1966 {WASM_SEC_ORDER_LINKING, WASM_SEC_ORDER_RELOC, WASM_SEC_ORDER_NAME}, 1967 // WASM_SEC_ORDER_RELOC (can be repeated) 1968 {}, 1969 // WASM_SEC_ORDER_NAME 1970 {WASM_SEC_ORDER_NAME, WASM_SEC_ORDER_PRODUCERS}, 1971 // WASM_SEC_ORDER_PRODUCERS 1972 {WASM_SEC_ORDER_PRODUCERS, WASM_SEC_ORDER_TARGET_FEATURES}, 1973 // WASM_SEC_ORDER_TARGET_FEATURES 1974 {WASM_SEC_ORDER_TARGET_FEATURES}}; 1975 1976 bool WasmSectionOrderChecker::isValidSectionOrder(unsigned ID, 1977 StringRef CustomSectionName) { 1978 int Order = getSectionOrder(ID, CustomSectionName); 1979 if (Order == WASM_SEC_ORDER_NONE) 1980 return true; 1981 1982 // Disallowed predecessors we need to check for 1983 SmallVector<int, WASM_NUM_SEC_ORDERS> WorkList; 1984 1985 // Keep track of completed checks to avoid repeating work 1986 bool Checked[WASM_NUM_SEC_ORDERS] = {}; 1987 1988 int Curr = Order; 1989 while (true) { 1990 // Add new disallowed predecessors to work list 1991 for (size_t I = 0;; ++I) { 1992 int Next = DisallowedPredecessors[Curr][I]; 1993 if (Next == WASM_SEC_ORDER_NONE) 1994 break; 1995 if (Checked[Next]) 1996 continue; 1997 WorkList.push_back(Next); 1998 Checked[Next] = true; 1999 } 2000 2001 if (WorkList.empty()) 2002 break; 2003 2004 // Consider next disallowed predecessor 2005 Curr = WorkList.pop_back_val(); 2006 if (Seen[Curr]) 2007 return false; 2008 } 2009 2010 // Have not seen any disallowed predecessors 2011 Seen[Order] = true; 2012 return true; 2013 } 2014