1 //===- WasmObjectFile.cpp - Wasm object file implementation ---------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/ADT/ArrayRef.h"
11 #include "llvm/ADT/STLExtras.h"
12 #include "llvm/ADT/StringRef.h"
13 #include "llvm/ADT/Triple.h"
14 #include "llvm/BinaryFormat/Wasm.h"
15 #include "llvm/MC/SubtargetFeature.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"
29 #include <system_error>
31 #define DEBUG_TYPE "wasm-object"
34 using namespace object;
36 Expected<std::unique_ptr<WasmObjectFile>>
37 ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) {
38 Error Err = Error::success();
39 auto ObjectFile = llvm::make_unique<WasmObjectFile>(Buffer, Err);
41 return std::move(Err);
43 return std::move(ObjectFile);
46 #define VARINT7_MAX ((1<<7)-1)
47 #define VARINT7_MIN (-(1<<7))
48 #define VARUINT7_MAX (1<<7)
49 #define VARUINT1_MAX (1)
51 static uint8_t readUint8(const uint8_t *&Ptr) { return *Ptr++; }
53 static uint32_t readUint32(const uint8_t *&Ptr) {
54 uint32_t Result = support::endian::read32le(Ptr);
55 Ptr += sizeof(Result);
59 static int32_t readFloat32(const uint8_t *&Ptr) {
61 memcpy(&Result, Ptr, sizeof(Result));
62 Ptr += sizeof(Result);
66 static int64_t readFloat64(const uint8_t *&Ptr) {
68 memcpy(&Result, Ptr, sizeof(Result));
69 Ptr += sizeof(Result);
73 static uint64_t readULEB128(const uint8_t *&Ptr) {
75 uint64_t Result = decodeULEB128(Ptr, &Count);
80 static StringRef readString(const uint8_t *&Ptr) {
81 uint32_t StringLen = readULEB128(Ptr);
82 StringRef Return = StringRef(reinterpret_cast<const char *>(Ptr), StringLen);
87 static int64_t readLEB128(const uint8_t *&Ptr) {
89 uint64_t Result = decodeSLEB128(Ptr, &Count);
94 static uint8_t readVaruint1(const uint8_t *&Ptr) {
95 int64_t result = readLEB128(Ptr);
96 assert(result <= VARUINT1_MAX && result >= 0);
100 static int8_t readVarint7(const uint8_t *&Ptr) {
101 int64_t result = readLEB128(Ptr);
102 assert(result <= VARINT7_MAX && result >= VARINT7_MIN);
106 static uint8_t readVaruint7(const uint8_t *&Ptr) {
107 uint64_t result = readULEB128(Ptr);
108 assert(result <= VARUINT7_MAX);
112 static int32_t readVarint32(const uint8_t *&Ptr) {
113 int64_t result = readLEB128(Ptr);
114 assert(result <= INT32_MAX && result >= INT32_MIN);
118 static uint32_t readVaruint32(const uint8_t *&Ptr) {
119 uint64_t result = readULEB128(Ptr);
120 assert(result <= UINT32_MAX);
124 static int64_t readVarint64(const uint8_t *&Ptr) {
125 return readLEB128(Ptr);
128 static uint8_t readOpcode(const uint8_t *&Ptr) {
129 return readUint8(Ptr);
132 static Error readInitExpr(wasm::WasmInitExpr &Expr, const uint8_t *&Ptr) {
133 Expr.Opcode = readOpcode(Ptr);
135 switch (Expr.Opcode) {
136 case wasm::WASM_OPCODE_I32_CONST:
137 Expr.Value.Int32 = readVarint32(Ptr);
139 case wasm::WASM_OPCODE_I64_CONST:
140 Expr.Value.Int64 = readVarint64(Ptr);
142 case wasm::WASM_OPCODE_F32_CONST:
143 Expr.Value.Float32 = readFloat32(Ptr);
145 case wasm::WASM_OPCODE_F64_CONST:
146 Expr.Value.Float64 = readFloat64(Ptr);
148 case wasm::WASM_OPCODE_GET_GLOBAL:
149 Expr.Value.Global = readULEB128(Ptr);
152 return make_error<GenericBinaryError>("Invalid opcode in init_expr",
153 object_error::parse_failed);
156 uint8_t EndOpcode = readOpcode(Ptr);
157 if (EndOpcode != wasm::WASM_OPCODE_END) {
158 return make_error<GenericBinaryError>("Invalid init_expr",
159 object_error::parse_failed);
161 return Error::success();
164 static wasm::WasmLimits readLimits(const uint8_t *&Ptr) {
165 wasm::WasmLimits Result;
166 Result.Flags = readVaruint1(Ptr);
167 Result.Initial = readVaruint32(Ptr);
168 if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
169 Result.Maximum = readVaruint32(Ptr);
173 static wasm::WasmTable readTable(const uint8_t *&Ptr) {
174 wasm::WasmTable Table;
175 Table.ElemType = readVarint7(Ptr);
176 Table.Limits = readLimits(Ptr);
180 static Error readSection(WasmSection &Section, const uint8_t *&Ptr,
181 const uint8_t *Start) {
182 // TODO(sbc): Avoid reading past EOF in the case of malformed files.
183 Section.Offset = Ptr - Start;
184 Section.Type = readVaruint7(Ptr);
185 uint32_t Size = readVaruint32(Ptr);
187 return make_error<StringError>("Zero length section",
188 object_error::parse_failed);
189 Section.Content = ArrayRef<uint8_t>(Ptr, Size);
191 return Error::success();
194 WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err)
195 : ObjectFile(Binary::ID_Wasm, Buffer) {
196 LinkingData.DataAlignment = 0;
197 LinkingData.DataSize = 0;
199 ErrorAsOutParameter ErrAsOutParam(&Err);
200 Header.Magic = getData().substr(0, 4);
201 if (Header.Magic != StringRef("\0asm", 4)) {
202 Err = make_error<StringError>("Bad magic number",
203 object_error::parse_failed);
207 const uint8_t *Eof = getPtr(getData().size());
208 const uint8_t *Ptr = getPtr(4);
211 Err = make_error<StringError>("Missing version number",
212 object_error::parse_failed);
216 Header.Version = readUint32(Ptr);
217 if (Header.Version != wasm::WasmVersion) {
218 Err = make_error<StringError>("Bad version number",
219 object_error::parse_failed);
225 if ((Err = readSection(Sec, Ptr, getPtr(0))))
227 if ((Err = parseSection(Sec)))
230 Sections.push_back(Sec);
234 Error WasmObjectFile::parseSection(WasmSection &Sec) {
235 const uint8_t* Start = Sec.Content.data();
236 const uint8_t* End = Start + Sec.Content.size();
238 case wasm::WASM_SEC_CUSTOM:
239 return parseCustomSection(Sec, Start, End);
240 case wasm::WASM_SEC_TYPE:
241 return parseTypeSection(Start, End);
242 case wasm::WASM_SEC_IMPORT:
243 return parseImportSection(Start, End);
244 case wasm::WASM_SEC_FUNCTION:
245 return parseFunctionSection(Start, End);
246 case wasm::WASM_SEC_TABLE:
247 return parseTableSection(Start, End);
248 case wasm::WASM_SEC_MEMORY:
249 return parseMemorySection(Start, End);
250 case wasm::WASM_SEC_GLOBAL:
251 return parseGlobalSection(Start, End);
252 case wasm::WASM_SEC_EXPORT:
253 return parseExportSection(Start, End);
254 case wasm::WASM_SEC_START:
255 return parseStartSection(Start, End);
256 case wasm::WASM_SEC_ELEM:
257 return parseElemSection(Start, End);
258 case wasm::WASM_SEC_CODE:
259 return parseCodeSection(Start, End);
260 case wasm::WASM_SEC_DATA:
261 return parseDataSection(Start, End);
263 return make_error<GenericBinaryError>("Bad section type",
264 object_error::parse_failed);
268 Error WasmObjectFile::parseNameSection(const uint8_t *Ptr, const uint8_t *End) {
270 uint8_t Type = readVarint7(Ptr);
271 uint32_t Size = readVaruint32(Ptr);
272 const uint8_t *SubSectionEnd = Ptr + Size;
274 case wasm::WASM_NAMES_FUNCTION: {
275 uint32_t Count = readVaruint32(Ptr);
277 uint32_t Index = readVaruint32(Ptr);
278 StringRef Name = readString(Ptr);
280 Symbols.emplace_back(Name,
281 WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME,
282 Sections.size(), Index);
286 // Ignore local names for now
287 case wasm::WASM_NAMES_LOCAL:
292 if (Ptr != SubSectionEnd)
293 return make_error<GenericBinaryError>("Name sub-section ended prematurely",
294 object_error::parse_failed);
298 return make_error<GenericBinaryError>("Name section ended prematurely",
299 object_error::parse_failed);
300 return Error::success();
303 Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr,
304 const uint8_t *End) {
305 HasLinkingSection = true;
307 uint8_t Type = readVarint7(Ptr);
308 uint32_t Size = readVaruint32(Ptr);
309 const uint8_t *SubSectionEnd = Ptr + Size;
311 case wasm::WASM_SYMBOL_INFO: {
312 uint32_t Count = readVaruint32(Ptr);
314 StringRef Symbol = readString(Ptr);
315 DEBUG(dbgs() << "reading syminfo: " << Symbol << "\n");
316 uint32_t Flags = readVaruint32(Ptr);
317 auto iter = SymbolMap.find(Symbol);
318 if (iter == SymbolMap.end()) {
319 return make_error<GenericBinaryError>(
320 "Invalid symbol name in linking section: " + Symbol,
321 object_error::parse_failed);
323 uint32_t SymIndex = iter->second;
324 assert(SymIndex < Symbols.size());
325 Symbols[SymIndex].Flags = Flags;
326 DEBUG(dbgs() << "Set symbol flags index:"
327 << SymIndex << " name:"
328 << Symbols[SymIndex].Name << " exptected:"
329 << Symbol << " flags: " << Flags << "\n");
333 case wasm::WASM_DATA_SIZE:
334 LinkingData.DataSize = readVaruint32(Ptr);
336 case wasm::WASM_DATA_ALIGNMENT:
337 LinkingData.DataAlignment = readVaruint32(Ptr);
339 case wasm::WASM_STACK_POINTER:
344 if (Ptr != SubSectionEnd)
345 return make_error<GenericBinaryError>(
346 "Linking sub-section ended prematurely", object_error::parse_failed);
349 return make_error<GenericBinaryError>("Linking section ended prematurely",
350 object_error::parse_failed);
351 return Error::success();
354 WasmSection* WasmObjectFile::findCustomSectionByName(StringRef Name) {
355 for (WasmSection& Section : Sections) {
356 if (Section.Type == wasm::WASM_SEC_CUSTOM && Section.Name == Name)
362 WasmSection* WasmObjectFile::findSectionByType(uint32_t Type) {
363 assert(Type != wasm::WASM_SEC_CUSTOM);
364 for (WasmSection& Section : Sections) {
365 if (Section.Type == Type)
371 Error WasmObjectFile::parseRelocSection(StringRef Name, const uint8_t *Ptr,
372 const uint8_t *End) {
373 uint8_t SectionCode = readVarint7(Ptr);
374 WasmSection* Section = nullptr;
375 if (SectionCode == wasm::WASM_SEC_CUSTOM) {
376 StringRef Name = readString(Ptr);
377 Section = findCustomSectionByName(Name);
379 Section = findSectionByType(SectionCode);
382 return make_error<GenericBinaryError>("Invalid section code",
383 object_error::parse_failed);
384 uint32_t RelocCount = readVaruint32(Ptr);
385 while (RelocCount--) {
386 wasm::WasmRelocation Reloc;
387 memset(&Reloc, 0, sizeof(Reloc));
388 Reloc.Type = readVaruint32(Ptr);
389 Reloc.Offset = readVaruint32(Ptr);
390 Reloc.Index = readVaruint32(Ptr);
391 switch (Reloc.Type) {
392 case wasm::R_WEBASSEMBLY_FUNCTION_INDEX_LEB:
393 case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB:
394 case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32:
395 case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB:
396 case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB:
398 case wasm::R_WEBASSEMBLY_MEMORY_ADDR_LEB:
399 case wasm::R_WEBASSEMBLY_MEMORY_ADDR_SLEB:
400 case wasm::R_WEBASSEMBLY_MEMORY_ADDR_I32:
401 Reloc.Addend = readVarint32(Ptr);
404 return make_error<GenericBinaryError>("Bad relocation type: " +
406 object_error::parse_failed);
408 Section->Relocations.push_back(Reloc);
411 return make_error<GenericBinaryError>("Reloc section ended prematurely",
412 object_error::parse_failed);
413 return Error::success();
416 Error WasmObjectFile::parseCustomSection(WasmSection &Sec,
417 const uint8_t *Ptr, const uint8_t *End) {
418 Sec.Name = readString(Ptr);
419 if (Sec.Name == "name") {
420 if (Error Err = parseNameSection(Ptr, End))
422 } else if (Sec.Name == "linking") {
423 if (Error Err = parseLinkingSection(Ptr, End))
425 } else if (Sec.Name.startswith("reloc.")) {
426 if (Error Err = parseRelocSection(Sec.Name, Ptr, End))
429 return Error::success();
432 Error WasmObjectFile::parseTypeSection(const uint8_t *Ptr, const uint8_t *End) {
433 uint32_t Count = readVaruint32(Ptr);
434 Signatures.reserve(Count);
436 wasm::WasmSignature Sig;
437 Sig.ReturnType = wasm::WASM_TYPE_NORESULT;
438 int8_t Form = readVarint7(Ptr);
439 if (Form != wasm::WASM_TYPE_FUNC) {
440 return make_error<GenericBinaryError>("Invalid signature type",
441 object_error::parse_failed);
443 uint32_t ParamCount = readVaruint32(Ptr);
444 Sig.ParamTypes.reserve(ParamCount);
445 while (ParamCount--) {
446 uint32_t ParamType = readVarint7(Ptr);
447 Sig.ParamTypes.push_back(ParamType);
449 uint32_t ReturnCount = readVaruint32(Ptr);
451 if (ReturnCount != 1) {
452 return make_error<GenericBinaryError>(
453 "Multiple return types not supported", object_error::parse_failed);
455 Sig.ReturnType = readVarint7(Ptr);
457 Signatures.push_back(Sig);
460 return make_error<GenericBinaryError>("Type section ended prematurely",
461 object_error::parse_failed);
462 return Error::success();
465 Error WasmObjectFile::parseImportSection(const uint8_t *Ptr, const uint8_t *End) {
466 uint32_t Count = readVaruint32(Ptr);
467 Imports.reserve(Count);
468 for (uint32_t i = 0; i < Count; i++) {
470 Im.Module = readString(Ptr);
471 Im.Field = readString(Ptr);
472 Im.Kind = readUint8(Ptr);
474 case wasm::WASM_EXTERNAL_FUNCTION:
475 NumImportedFunctions++;
476 Im.SigIndex = readVaruint32(Ptr);
477 SymbolMap.try_emplace(Im.Field, Symbols.size());
478 Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::FUNCTION_IMPORT,
480 DEBUG(dbgs() << "Adding import: " << Symbols.back()
481 << " sym index:" << Symbols.size() << "\n");
483 case wasm::WASM_EXTERNAL_GLOBAL:
484 NumImportedGlobals++;
485 Im.Global.Type = readVarint7(Ptr);
486 Im.Global.Mutable = readVaruint1(Ptr);
487 SymbolMap.try_emplace(Im.Field, Symbols.size());
488 Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT,
490 DEBUG(dbgs() << "Adding import: " << Symbols.back()
491 << " sym index:" << Symbols.size() << "\n");
493 case wasm::WASM_EXTERNAL_MEMORY:
494 Im.Memory = readLimits(Ptr);
496 case wasm::WASM_EXTERNAL_TABLE:
497 Im.Table = readTable(Ptr);
498 if (Im.Table.ElemType != wasm::WASM_TYPE_ANYFUNC) {
499 return make_error<GenericBinaryError>("Invalid table element type",
500 object_error::parse_failed);
504 return make_error<GenericBinaryError>(
505 "Unexpected import kind", object_error::parse_failed);
507 Imports.push_back(Im);
510 return make_error<GenericBinaryError>("Import section ended prematurely",
511 object_error::parse_failed);
512 return Error::success();
515 Error WasmObjectFile::parseFunctionSection(const uint8_t *Ptr, const uint8_t *End) {
516 uint32_t Count = readVaruint32(Ptr);
517 FunctionTypes.reserve(Count);
519 FunctionTypes.push_back(readVaruint32(Ptr));
522 return make_error<GenericBinaryError>("Function section ended prematurely",
523 object_error::parse_failed);
524 return Error::success();
527 Error WasmObjectFile::parseTableSection(const uint8_t *Ptr, const uint8_t *End) {
528 uint32_t Count = readVaruint32(Ptr);
529 Tables.reserve(Count);
531 Tables.push_back(readTable(Ptr));
532 if (Tables.back().ElemType != wasm::WASM_TYPE_ANYFUNC) {
533 return make_error<GenericBinaryError>("Invalid table element type",
534 object_error::parse_failed);
538 return make_error<GenericBinaryError>("Table section ended prematurely",
539 object_error::parse_failed);
540 return Error::success();
543 Error WasmObjectFile::parseMemorySection(const uint8_t *Ptr, const uint8_t *End) {
544 uint32_t Count = readVaruint32(Ptr);
545 Memories.reserve(Count);
547 Memories.push_back(readLimits(Ptr));
550 return make_error<GenericBinaryError>("Memory section ended prematurely",
551 object_error::parse_failed);
552 return Error::success();
555 Error WasmObjectFile::parseGlobalSection(const uint8_t *Ptr, const uint8_t *End) {
556 uint32_t Count = readVaruint32(Ptr);
557 Globals.reserve(Count);
559 wasm::WasmGlobal Global;
560 Global.Type = readVarint7(Ptr);
561 Global.Mutable = readVaruint1(Ptr);
562 if (Error Err = readInitExpr(Global.InitExpr, Ptr))
564 Globals.push_back(Global);
567 return make_error<GenericBinaryError>("Global section ended prematurely",
568 object_error::parse_failed);
569 return Error::success();
572 Error WasmObjectFile::parseExportSection(const uint8_t *Ptr, const uint8_t *End) {
573 uint32_t Count = readVaruint32(Ptr);
574 Exports.reserve(Count);
575 for (uint32_t i = 0; i < Count; i++) {
577 Ex.Name = readString(Ptr);
578 Ex.Kind = readUint8(Ptr);
579 Ex.Index = readVaruint32(Ptr);
580 WasmSymbol::SymbolType ExportType;
581 bool MakeSymbol = false;
583 case wasm::WASM_EXTERNAL_FUNCTION:
584 ExportType = WasmSymbol::SymbolType::FUNCTION_EXPORT;
585 if (Ex.Index >= FunctionTypes.size() + NumImportedFunctions)
586 return make_error<GenericBinaryError>("Invalid function export",
587 object_error::parse_failed);
590 case wasm::WASM_EXTERNAL_GLOBAL:
591 ExportType = WasmSymbol::SymbolType::GLOBAL_EXPORT;
592 if (Ex.Index >= Globals.size() + NumImportedGlobals)
593 return make_error<GenericBinaryError>("Invalid global export",
594 object_error::parse_failed);
597 case wasm::WASM_EXTERNAL_MEMORY:
598 case wasm::WASM_EXTERNAL_TABLE:
601 return make_error<GenericBinaryError>(
602 "Unexpected export kind", object_error::parse_failed);
605 auto Pair = SymbolMap.try_emplace(Ex.Name, Symbols.size());
607 Symbols.emplace_back(Ex.Name, ExportType,
609 DEBUG(dbgs() << "Adding export: " << Symbols.back()
610 << " sym index:" << Symbols.size() << "\n");
612 uint32_t SymIndex = Pair.first->second;
613 Symbols[SymIndex] = WasmSymbol(Ex.Name, ExportType, Sections.size(), i);
614 DEBUG(dbgs() << "Replacing existing symbol: " << Symbols[SymIndex]
615 << " sym index:" << SymIndex << "\n");
618 Exports.push_back(Ex);
621 return make_error<GenericBinaryError>("Export section ended prematurely",
622 object_error::parse_failed);
623 return Error::success();
626 Error WasmObjectFile::parseStartSection(const uint8_t *Ptr, const uint8_t *End) {
627 StartFunction = readVaruint32(Ptr);
628 if (StartFunction >= FunctionTypes.size())
629 return make_error<GenericBinaryError>("Invalid start function",
630 object_error::parse_failed);
631 return Error::success();
634 Error WasmObjectFile::parseCodeSection(const uint8_t *Ptr, const uint8_t *End) {
635 uint32_t FunctionCount = readVaruint32(Ptr);
636 if (FunctionCount != FunctionTypes.size()) {
637 return make_error<GenericBinaryError>("Invalid function count",
638 object_error::parse_failed);
641 CodeSection = ArrayRef<uint8_t>(Ptr, End - Ptr);
643 while (FunctionCount--) {
644 wasm::WasmFunction Function;
645 uint32_t FunctionSize = readVaruint32(Ptr);
646 const uint8_t *FunctionEnd = Ptr + FunctionSize;
648 uint32_t NumLocalDecls = readVaruint32(Ptr);
649 Function.Locals.reserve(NumLocalDecls);
650 while (NumLocalDecls--) {
651 wasm::WasmLocalDecl Decl;
652 Decl.Count = readVaruint32(Ptr);
653 Decl.Type = readVarint7(Ptr);
654 Function.Locals.push_back(Decl);
657 uint32_t BodySize = FunctionEnd - Ptr;
658 Function.Body = ArrayRef<uint8_t>(Ptr, BodySize);
660 assert(Ptr == FunctionEnd);
661 Functions.push_back(Function);
664 return make_error<GenericBinaryError>("Code section ended prematurely",
665 object_error::parse_failed);
666 return Error::success();
669 Error WasmObjectFile::parseElemSection(const uint8_t *Ptr, const uint8_t *End) {
670 uint32_t Count = readVaruint32(Ptr);
671 ElemSegments.reserve(Count);
673 wasm::WasmElemSegment Segment;
674 Segment.TableIndex = readVaruint32(Ptr);
675 if (Segment.TableIndex != 0) {
676 return make_error<GenericBinaryError>("Invalid TableIndex",
677 object_error::parse_failed);
679 if (Error Err = readInitExpr(Segment.Offset, Ptr))
681 uint32_t NumElems = readVaruint32(Ptr);
683 Segment.Functions.push_back(readVaruint32(Ptr));
685 ElemSegments.push_back(Segment);
688 return make_error<GenericBinaryError>("Elem section ended prematurely",
689 object_error::parse_failed);
690 return Error::success();
693 Error WasmObjectFile::parseDataSection(const uint8_t *Ptr, const uint8_t *End) {
694 const uint8_t *Start = Ptr;
695 uint32_t Count = readVaruint32(Ptr);
696 DataSegments.reserve(Count);
699 Segment.Data.MemoryIndex = readVaruint32(Ptr);
700 if (Error Err = readInitExpr(Segment.Data.Offset, Ptr))
702 uint32_t Size = readVaruint32(Ptr);
703 Segment.Data.Content = ArrayRef<uint8_t>(Ptr, Size);
704 Segment.SectionOffset = Ptr - Start;
706 DataSegments.push_back(Segment);
709 return make_error<GenericBinaryError>("Data section ended prematurely",
710 object_error::parse_failed);
711 return Error::success();
714 const uint8_t *WasmObjectFile::getPtr(size_t Offset) const {
715 return reinterpret_cast<const uint8_t *>(getData().substr(Offset, 1).data());
718 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const {
722 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.a++; }
724 uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
725 uint32_t Result = SymbolRef::SF_None;
726 const WasmSymbol &Sym = getWasmSymbol(Symb);
728 DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n");
729 if (Sym.Flags & wasm::WASM_SYMBOL_FLAG_WEAK)
730 Result |= SymbolRef::SF_Weak;
733 case WasmSymbol::SymbolType::FUNCTION_IMPORT:
734 Result |= SymbolRef::SF_Undefined | SymbolRef::SF_Executable;
736 case WasmSymbol::SymbolType::FUNCTION_EXPORT:
737 Result |= SymbolRef::SF_Global | SymbolRef::SF_Executable;
739 case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
740 Result |= SymbolRef::SF_Executable;
741 Result |= SymbolRef::SF_FormatSpecific;
743 case WasmSymbol::SymbolType::GLOBAL_IMPORT:
744 Result |= SymbolRef::SF_Undefined;
746 case WasmSymbol::SymbolType::GLOBAL_EXPORT:
747 Result |= SymbolRef::SF_Global;
754 basic_symbol_iterator WasmObjectFile::symbol_begin() const {
757 return BasicSymbolRef(Ref, this);
760 basic_symbol_iterator WasmObjectFile::symbol_end() const {
762 Ref.d.a = Symbols.size();
763 return BasicSymbolRef(Ref, this);
766 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const {
767 return Symbols[Symb.d.a];
770 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const {
771 return getWasmSymbol(Symb.getRawDataRefImpl());
774 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const {
775 return getWasmSymbol(Symb).Name;
778 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
779 return getSymbolValue(Symb);
782 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
783 const WasmSymbol& Sym = getWasmSymbol(Symb);
785 case WasmSymbol::SymbolType::FUNCTION_IMPORT:
786 case WasmSymbol::SymbolType::GLOBAL_IMPORT:
788 case WasmSymbol::SymbolType::FUNCTION_EXPORT:
789 return Exports[Sym.ElementIndex].Index;
790 case WasmSymbol::SymbolType::GLOBAL_EXPORT: {
791 uint32_t GlobalIndex = Exports[Sym.ElementIndex].Index - NumImportedGlobals;
792 assert(GlobalIndex < Globals.size());
793 const wasm::WasmGlobal& Global = Globals[GlobalIndex];
794 return Global.InitExpr.Value.Int32;
796 case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
797 return Sym.ElementIndex;
799 llvm_unreachable("invalid symbol type");
802 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const {
803 llvm_unreachable("not yet implemented");
807 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
808 llvm_unreachable("not yet implemented");
812 Expected<SymbolRef::Type>
813 WasmObjectFile::getSymbolType(DataRefImpl Symb) const {
814 const WasmSymbol &Sym = getWasmSymbol(Symb);
817 case WasmSymbol::SymbolType::FUNCTION_IMPORT:
818 case WasmSymbol::SymbolType::FUNCTION_EXPORT:
819 case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
820 return SymbolRef::ST_Function;
821 case WasmSymbol::SymbolType::GLOBAL_IMPORT:
822 case WasmSymbol::SymbolType::GLOBAL_EXPORT:
823 return SymbolRef::ST_Data;
826 llvm_unreachable("Unknown WasmSymbol::SymbolType");
827 return SymbolRef::ST_Other;
830 Expected<section_iterator>
831 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
833 Ref.d.a = getWasmSymbol(Symb).Section;
834 return section_iterator(SectionRef(Ref, this));
837 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; }
839 std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec,
840 StringRef &Res) const {
841 const WasmSection &S = Sections[Sec.d.a];
843 case wasm::WASM_SEC_##X: \
858 case wasm::WASM_SEC_CUSTOM:
862 return object_error::invalid_section_index;
865 return std::error_code();
868 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; }
870 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const {
874 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const {
875 const WasmSection &S = Sections[Sec.d.a];
876 return S.Content.size();
879 std::error_code WasmObjectFile::getSectionContents(DataRefImpl Sec,
880 StringRef &Res) const {
881 const WasmSection &S = Sections[Sec.d.a];
882 // This will never fail since wasm sections can never be empty (user-sections
883 // must have a name and non-user sections each have a defined structure).
884 Res = StringRef(reinterpret_cast<const char *>(S.Content.data()),
886 return std::error_code();
889 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const {
893 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const {
897 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const {
898 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE;
901 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const {
902 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA;
905 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; }
907 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; }
909 bool WasmObjectFile::isSectionBitcode(DataRefImpl Sec) const { return false; }
911 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const {
912 DataRefImpl RelocRef;
913 RelocRef.d.a = Ref.d.a;
915 return relocation_iterator(RelocationRef(RelocRef, this));
918 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const {
919 const WasmSection &Sec = getWasmSection(Ref);
920 DataRefImpl RelocRef;
921 RelocRef.d.a = Ref.d.a;
922 RelocRef.d.b = Sec.Relocations.size();
923 return relocation_iterator(RelocationRef(RelocRef, this));
926 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
930 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const {
931 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
935 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
936 llvm_unreachable("not yet implemented");
938 return symbol_iterator(Ref);
941 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const {
942 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
946 void WasmObjectFile::getRelocationTypeName(
947 DataRefImpl Ref, SmallVectorImpl<char> &Result) const {
948 const wasm::WasmRelocation& Rel = getWasmRelocation(Ref);
949 StringRef Res = "Unknown";
951 #define WASM_RELOC(name, value) \
957 #include "llvm/BinaryFormat/WasmRelocs/WebAssembly.def"
962 Result.append(Res.begin(), Res.end());
965 section_iterator WasmObjectFile::section_begin() const {
968 return section_iterator(SectionRef(Ref, this));
971 section_iterator WasmObjectFile::section_end() const {
973 Ref.d.a = Sections.size();
974 return section_iterator(SectionRef(Ref, this));
977 uint8_t WasmObjectFile::getBytesInAddress() const { return 4; }
979 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; }
981 unsigned WasmObjectFile::getArch() const { return Triple::wasm32; }
983 SubtargetFeatures WasmObjectFile::getFeatures() const {
984 return SubtargetFeatures();
987 bool WasmObjectFile::isRelocatableObject() const {
988 return HasLinkingSection;
991 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const {
992 assert(Ref.d.a < Sections.size());
993 return Sections[Ref.d.a];
997 WasmObjectFile::getWasmSection(const SectionRef &Section) const {
998 return getWasmSection(Section.getRawDataRefImpl());
1001 const wasm::WasmRelocation &
1002 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const {
1003 return getWasmRelocation(Ref.getRawDataRefImpl());
1006 const wasm::WasmRelocation &
1007 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const {
1008 assert(Ref.d.a < Sections.size());
1009 const WasmSection& Sec = Sections[Ref.d.a];
1010 assert(Ref.d.b < Sec.Relocations.size());
1011 return Sec.Relocations[Ref.d.b];