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);
206 const uint8_t *Ptr = getPtr(4);
207 Header.Version = readUint32(Ptr);
208 if (Header.Version != wasm::WasmVersion) {
209 Err = make_error<StringError>("Bad version number",
210 object_error::parse_failed);
214 const uint8_t *Eof = getPtr(getData().size());
217 if ((Err = readSection(Sec, Ptr, getPtr(0))))
219 if ((Err = parseSection(Sec)))
222 Sections.push_back(Sec);
226 Error WasmObjectFile::parseSection(WasmSection &Sec) {
227 const uint8_t* Start = Sec.Content.data();
228 const uint8_t* End = Start + Sec.Content.size();
230 case wasm::WASM_SEC_CUSTOM:
231 return parseCustomSection(Sec, Start, End);
232 case wasm::WASM_SEC_TYPE:
233 return parseTypeSection(Start, End);
234 case wasm::WASM_SEC_IMPORT:
235 return parseImportSection(Start, End);
236 case wasm::WASM_SEC_FUNCTION:
237 return parseFunctionSection(Start, End);
238 case wasm::WASM_SEC_TABLE:
239 return parseTableSection(Start, End);
240 case wasm::WASM_SEC_MEMORY:
241 return parseMemorySection(Start, End);
242 case wasm::WASM_SEC_GLOBAL:
243 return parseGlobalSection(Start, End);
244 case wasm::WASM_SEC_EXPORT:
245 return parseExportSection(Start, End);
246 case wasm::WASM_SEC_START:
247 return parseStartSection(Start, End);
248 case wasm::WASM_SEC_ELEM:
249 return parseElemSection(Start, End);
250 case wasm::WASM_SEC_CODE:
251 return parseCodeSection(Start, End);
252 case wasm::WASM_SEC_DATA:
253 return parseDataSection(Start, End);
255 return make_error<GenericBinaryError>("Bad section type",
256 object_error::parse_failed);
260 Error WasmObjectFile::parseNameSection(const uint8_t *Ptr, const uint8_t *End) {
262 uint8_t Type = readVarint7(Ptr);
263 uint32_t Size = readVaruint32(Ptr);
264 const uint8_t *SubSectionEnd = Ptr + Size;
266 case wasm::WASM_NAMES_FUNCTION: {
267 uint32_t Count = readVaruint32(Ptr);
269 uint32_t Index = readVaruint32(Ptr);
270 StringRef Name = readString(Ptr);
272 Symbols.emplace_back(Name,
273 WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME,
274 Sections.size(), Index);
278 // Ignore local names for now
279 case wasm::WASM_NAMES_LOCAL:
284 if (Ptr != SubSectionEnd)
285 return make_error<GenericBinaryError>("Name sub-section ended prematurely",
286 object_error::parse_failed);
290 return make_error<GenericBinaryError>("Name section ended prematurely",
291 object_error::parse_failed);
292 return Error::success();
295 Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr,
296 const uint8_t *End) {
297 HasLinkingSection = true;
299 uint8_t Type = readVarint7(Ptr);
300 uint32_t Size = readVaruint32(Ptr);
301 const uint8_t *SubSectionEnd = Ptr + Size;
303 case wasm::WASM_SYMBOL_INFO: {
304 uint32_t Count = readVaruint32(Ptr);
306 StringRef Symbol = readString(Ptr);
307 DEBUG(dbgs() << "reading syminfo: " << Symbol << "\n");
308 uint32_t Flags = readVaruint32(Ptr);
309 auto iter = SymbolMap.find(Symbol);
310 if (iter == SymbolMap.end()) {
311 return make_error<GenericBinaryError>(
312 "Invalid symbol name in linking section: " + Symbol,
313 object_error::parse_failed);
315 uint32_t SymIndex = iter->second;
316 assert(SymIndex < Symbols.size());
317 Symbols[SymIndex].Flags = Flags;
318 DEBUG(dbgs() << "Set symbol flags index:"
319 << SymIndex << " name:"
320 << Symbols[SymIndex].Name << " exptected:"
321 << Symbol << " flags: " << Flags << "\n");
325 case wasm::WASM_DATA_SIZE:
326 LinkingData.DataSize = readVaruint32(Ptr);
328 case wasm::WASM_DATA_ALIGNMENT:
329 LinkingData.DataAlignment = readVaruint32(Ptr);
331 case wasm::WASM_STACK_POINTER:
336 if (Ptr != SubSectionEnd)
337 return make_error<GenericBinaryError>(
338 "Linking sub-section ended prematurely", object_error::parse_failed);
341 return make_error<GenericBinaryError>("Linking section ended prematurely",
342 object_error::parse_failed);
343 return Error::success();
346 WasmSection* WasmObjectFile::findCustomSectionByName(StringRef Name) {
347 for (WasmSection& Section : Sections) {
348 if (Section.Type == wasm::WASM_SEC_CUSTOM && Section.Name == Name)
354 WasmSection* WasmObjectFile::findSectionByType(uint32_t Type) {
355 assert(Type != wasm::WASM_SEC_CUSTOM);
356 for (WasmSection& Section : Sections) {
357 if (Section.Type == Type)
363 Error WasmObjectFile::parseRelocSection(StringRef Name, const uint8_t *Ptr,
364 const uint8_t *End) {
365 uint8_t SectionCode = readVarint7(Ptr);
366 WasmSection* Section = nullptr;
367 if (SectionCode == wasm::WASM_SEC_CUSTOM) {
368 StringRef Name = readString(Ptr);
369 Section = findCustomSectionByName(Name);
371 Section = findSectionByType(SectionCode);
374 return make_error<GenericBinaryError>("Invalid section code",
375 object_error::parse_failed);
376 uint32_t RelocCount = readVaruint32(Ptr);
377 while (RelocCount--) {
378 wasm::WasmRelocation Reloc;
379 memset(&Reloc, 0, sizeof(Reloc));
380 Reloc.Type = readVaruint32(Ptr);
381 Reloc.Offset = readVaruint32(Ptr);
382 Reloc.Index = readVaruint32(Ptr);
383 switch (Reloc.Type) {
384 case wasm::R_WEBASSEMBLY_FUNCTION_INDEX_LEB:
385 case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB:
386 case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32:
387 case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB:
388 case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB:
390 case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_LEB:
391 case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_SLEB:
392 case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_I32:
393 Reloc.Addend = readVarint32(Ptr);
396 return make_error<GenericBinaryError>("Bad relocation type: " +
398 object_error::parse_failed);
400 Section->Relocations.push_back(Reloc);
403 return make_error<GenericBinaryError>("Reloc section ended prematurely",
404 object_error::parse_failed);
405 return Error::success();
408 Error WasmObjectFile::parseCustomSection(WasmSection &Sec,
409 const uint8_t *Ptr, const uint8_t *End) {
410 Sec.Name = readString(Ptr);
411 if (Sec.Name == "name") {
412 if (Error Err = parseNameSection(Ptr, End))
414 } else if (Sec.Name == "linking") {
415 if (Error Err = parseLinkingSection(Ptr, End))
417 } else if (Sec.Name.startswith("reloc.")) {
418 if (Error Err = parseRelocSection(Sec.Name, Ptr, End))
421 return Error::success();
424 Error WasmObjectFile::parseTypeSection(const uint8_t *Ptr, const uint8_t *End) {
425 uint32_t Count = readVaruint32(Ptr);
426 Signatures.reserve(Count);
428 wasm::WasmSignature Sig;
429 Sig.ReturnType = wasm::WASM_TYPE_NORESULT;
430 int8_t Form = readVarint7(Ptr);
431 if (Form != wasm::WASM_TYPE_FUNC) {
432 return make_error<GenericBinaryError>("Invalid signature type",
433 object_error::parse_failed);
435 uint32_t ParamCount = readVaruint32(Ptr);
436 Sig.ParamTypes.reserve(ParamCount);
437 while (ParamCount--) {
438 uint32_t ParamType = readVarint7(Ptr);
439 Sig.ParamTypes.push_back(ParamType);
441 uint32_t ReturnCount = readVaruint32(Ptr);
443 if (ReturnCount != 1) {
444 return make_error<GenericBinaryError>(
445 "Multiple return types not supported", object_error::parse_failed);
447 Sig.ReturnType = readVarint7(Ptr);
449 Signatures.push_back(Sig);
452 return make_error<GenericBinaryError>("Type section ended prematurely",
453 object_error::parse_failed);
454 return Error::success();
457 Error WasmObjectFile::parseImportSection(const uint8_t *Ptr, const uint8_t *End) {
458 uint32_t Count = readVaruint32(Ptr);
459 Imports.reserve(Count);
460 for (uint32_t i = 0; i < Count; i++) {
462 Im.Module = readString(Ptr);
463 Im.Field = readString(Ptr);
464 Im.Kind = readUint8(Ptr);
466 case wasm::WASM_EXTERNAL_FUNCTION:
467 Im.SigIndex = readVaruint32(Ptr);
468 SymbolMap.try_emplace(Im.Field, Symbols.size());
469 Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::FUNCTION_IMPORT,
471 DEBUG(dbgs() << "Adding import: " << Symbols.back()
472 << " sym index:" << Symbols.size() << "\n");
474 case wasm::WASM_EXTERNAL_GLOBAL:
475 Im.Global.Type = readVarint7(Ptr);
476 Im.Global.Mutable = readVaruint1(Ptr);
477 SymbolMap.try_emplace(Im.Field, Symbols.size());
478 Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT,
480 DEBUG(dbgs() << "Adding import: " << Symbols.back()
481 << " sym index:" << Symbols.size() << "\n");
483 case wasm::WASM_EXTERNAL_MEMORY:
484 Im.Memory = readLimits(Ptr);
486 case wasm::WASM_EXTERNAL_TABLE:
487 Im.Table = readTable(Ptr);
488 if (Im.Table.ElemType != wasm::WASM_TYPE_ANYFUNC) {
489 return make_error<GenericBinaryError>("Invalid table element type",
490 object_error::parse_failed);
494 return make_error<GenericBinaryError>(
495 "Unexpected import kind", object_error::parse_failed);
497 Imports.push_back(Im);
500 return make_error<GenericBinaryError>("Import section ended prematurely",
501 object_error::parse_failed);
502 return Error::success();
505 Error WasmObjectFile::parseFunctionSection(const uint8_t *Ptr, const uint8_t *End) {
506 uint32_t Count = readVaruint32(Ptr);
507 FunctionTypes.reserve(Count);
509 FunctionTypes.push_back(readVaruint32(Ptr));
512 return make_error<GenericBinaryError>("Function section ended prematurely",
513 object_error::parse_failed);
514 return Error::success();
517 Error WasmObjectFile::parseTableSection(const uint8_t *Ptr, const uint8_t *End) {
518 uint32_t Count = readVaruint32(Ptr);
519 Tables.reserve(Count);
521 Tables.push_back(readTable(Ptr));
522 if (Tables.back().ElemType != wasm::WASM_TYPE_ANYFUNC) {
523 return make_error<GenericBinaryError>("Invalid table element type",
524 object_error::parse_failed);
528 return make_error<GenericBinaryError>("Table section ended prematurely",
529 object_error::parse_failed);
530 return Error::success();
533 Error WasmObjectFile::parseMemorySection(const uint8_t *Ptr, const uint8_t *End) {
534 uint32_t Count = readVaruint32(Ptr);
535 Memories.reserve(Count);
537 Memories.push_back(readLimits(Ptr));
540 return make_error<GenericBinaryError>("Memory section ended prematurely",
541 object_error::parse_failed);
542 return Error::success();
545 Error WasmObjectFile::parseGlobalSection(const uint8_t *Ptr, const uint8_t *End) {
546 uint32_t Count = readVaruint32(Ptr);
547 Globals.reserve(Count);
549 wasm::WasmGlobal Global;
550 Global.Type = readVarint7(Ptr);
551 Global.Mutable = readVaruint1(Ptr);
552 if (Error Err = readInitExpr(Global.InitExpr, Ptr))
554 Globals.push_back(Global);
557 return make_error<GenericBinaryError>("Global section ended prematurely",
558 object_error::parse_failed);
559 return Error::success();
562 Error WasmObjectFile::parseExportSection(const uint8_t *Ptr, const uint8_t *End) {
563 uint32_t Count = readVaruint32(Ptr);
564 Exports.reserve(Count);
565 for (uint32_t i = 0; i < Count; i++) {
567 Ex.Name = readString(Ptr);
568 Ex.Kind = readUint8(Ptr);
569 Ex.Index = readVaruint32(Ptr);
570 WasmSymbol::SymbolType ExportType;
571 bool MakeSymbol = false;
573 case wasm::WASM_EXTERNAL_FUNCTION:
574 ExportType = WasmSymbol::SymbolType::FUNCTION_EXPORT;
577 case wasm::WASM_EXTERNAL_GLOBAL:
578 ExportType = WasmSymbol::SymbolType::GLOBAL_EXPORT;
581 case wasm::WASM_EXTERNAL_MEMORY:
582 case wasm::WASM_EXTERNAL_TABLE:
585 return make_error<GenericBinaryError>(
586 "Unexpected export kind", object_error::parse_failed);
589 auto Pair = SymbolMap.try_emplace(Ex.Name, Symbols.size());
591 Symbols.emplace_back(Ex.Name, ExportType,
593 DEBUG(dbgs() << "Adding export: " << Symbols.back()
594 << " sym index:" << Symbols.size() << "\n");
596 uint32_t SymIndex = Pair.first->second;
597 Symbols[SymIndex] = WasmSymbol(Ex.Name, ExportType, Sections.size(), i);
598 DEBUG(dbgs() << "Replacing existing symbol: " << Symbols[SymIndex]
599 << " sym index:" << SymIndex << "\n");
602 Exports.push_back(Ex);
605 return make_error<GenericBinaryError>("Export section ended prematurely",
606 object_error::parse_failed);
607 return Error::success();
610 Error WasmObjectFile::parseStartSection(const uint8_t *Ptr, const uint8_t *End) {
611 StartFunction = readVaruint32(Ptr);
612 if (StartFunction >= FunctionTypes.size())
613 return make_error<GenericBinaryError>("Invalid start function",
614 object_error::parse_failed);
615 return Error::success();
618 Error WasmObjectFile::parseCodeSection(const uint8_t *Ptr, const uint8_t *End) {
619 uint32_t FunctionCount = readVaruint32(Ptr);
620 if (FunctionCount != FunctionTypes.size()) {
621 return make_error<GenericBinaryError>("Invalid function count",
622 object_error::parse_failed);
625 CodeSection = ArrayRef<uint8_t>(Ptr, End - Ptr);
627 while (FunctionCount--) {
628 wasm::WasmFunction Function;
629 uint32_t FunctionSize = readVaruint32(Ptr);
630 const uint8_t *FunctionEnd = Ptr + FunctionSize;
632 uint32_t NumLocalDecls = readVaruint32(Ptr);
633 Function.Locals.reserve(NumLocalDecls);
634 while (NumLocalDecls--) {
635 wasm::WasmLocalDecl Decl;
636 Decl.Count = readVaruint32(Ptr);
637 Decl.Type = readVarint7(Ptr);
638 Function.Locals.push_back(Decl);
641 uint32_t BodySize = FunctionEnd - Ptr;
642 Function.Body = ArrayRef<uint8_t>(Ptr, BodySize);
644 assert(Ptr == FunctionEnd);
645 Functions.push_back(Function);
648 return make_error<GenericBinaryError>("Code section ended prematurely",
649 object_error::parse_failed);
650 return Error::success();
653 Error WasmObjectFile::parseElemSection(const uint8_t *Ptr, const uint8_t *End) {
654 uint32_t Count = readVaruint32(Ptr);
655 ElemSegments.reserve(Count);
657 wasm::WasmElemSegment Segment;
658 Segment.TableIndex = readVaruint32(Ptr);
659 if (Segment.TableIndex != 0) {
660 return make_error<GenericBinaryError>("Invalid TableIndex",
661 object_error::parse_failed);
663 if (Error Err = readInitExpr(Segment.Offset, Ptr))
665 uint32_t NumElems = readVaruint32(Ptr);
667 Segment.Functions.push_back(readVaruint32(Ptr));
669 ElemSegments.push_back(Segment);
672 return make_error<GenericBinaryError>("Elem section ended prematurely",
673 object_error::parse_failed);
674 return Error::success();
677 Error WasmObjectFile::parseDataSection(const uint8_t *Ptr, const uint8_t *End) {
678 const uint8_t *Start = Ptr;
679 uint32_t Count = readVaruint32(Ptr);
680 DataSegments.reserve(Count);
683 Segment.Data.MemoryIndex = readVaruint32(Ptr);
684 if (Error Err = readInitExpr(Segment.Data.Offset, Ptr))
686 uint32_t Size = readVaruint32(Ptr);
687 Segment.Data.Content = ArrayRef<uint8_t>(Ptr, Size);
688 Segment.SectionOffset = Ptr - Start;
690 DataSegments.push_back(Segment);
693 return make_error<GenericBinaryError>("Data section ended prematurely",
694 object_error::parse_failed);
695 return Error::success();
698 const uint8_t *WasmObjectFile::getPtr(size_t Offset) const {
699 return reinterpret_cast<const uint8_t *>(getData().substr(Offset, 1).data());
702 const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const {
706 void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.a++; }
708 uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const {
709 uint32_t Result = SymbolRef::SF_None;
710 const WasmSymbol &Sym = getWasmSymbol(Symb);
712 DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n");
713 if (Sym.Flags & wasm::WASM_SYMBOL_FLAG_WEAK)
714 Result |= SymbolRef::SF_Weak;
717 case WasmSymbol::SymbolType::FUNCTION_IMPORT:
718 Result |= SymbolRef::SF_Undefined | SymbolRef::SF_Executable;
720 case WasmSymbol::SymbolType::FUNCTION_EXPORT:
721 Result |= SymbolRef::SF_Global | SymbolRef::SF_Executable;
723 case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
724 Result |= SymbolRef::SF_Executable;
725 Result |= SymbolRef::SF_FormatSpecific;
727 case WasmSymbol::SymbolType::GLOBAL_IMPORT:
728 Result |= SymbolRef::SF_Undefined;
730 case WasmSymbol::SymbolType::GLOBAL_EXPORT:
731 Result |= SymbolRef::SF_Global;
738 basic_symbol_iterator WasmObjectFile::symbol_begin() const {
741 return BasicSymbolRef(Ref, this);
744 basic_symbol_iterator WasmObjectFile::symbol_end() const {
746 Ref.d.a = Symbols.size();
747 return BasicSymbolRef(Ref, this);
750 const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const {
751 return Symbols[Symb.d.a];
754 const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const {
755 return getWasmSymbol(Symb.getRawDataRefImpl());
758 Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const {
759 return getWasmSymbol(Symb).Name;
762 Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const {
763 return getSymbolValue(Symb);
766 uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
767 const WasmSymbol& Sym = getWasmSymbol(Symb);
769 case WasmSymbol::SymbolType::FUNCTION_IMPORT:
770 case WasmSymbol::SymbolType::GLOBAL_IMPORT:
772 case WasmSymbol::SymbolType::FUNCTION_EXPORT:
773 case WasmSymbol::SymbolType::GLOBAL_EXPORT:
774 return Exports[Sym.ElementIndex].Index;
775 case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
776 return Sym.ElementIndex;
778 llvm_unreachable("invalid symbol type");
781 uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const {
782 llvm_unreachable("not yet implemented");
786 uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
787 llvm_unreachable("not yet implemented");
791 Expected<SymbolRef::Type>
792 WasmObjectFile::getSymbolType(DataRefImpl Symb) const {
793 const WasmSymbol &Sym = getWasmSymbol(Symb);
796 case WasmSymbol::SymbolType::FUNCTION_IMPORT:
797 case WasmSymbol::SymbolType::FUNCTION_EXPORT:
798 case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME:
799 return SymbolRef::ST_Function;
800 case WasmSymbol::SymbolType::GLOBAL_IMPORT:
801 case WasmSymbol::SymbolType::GLOBAL_EXPORT:
802 return SymbolRef::ST_Data;
805 llvm_unreachable("Unknown WasmSymbol::SymbolType");
806 return SymbolRef::ST_Other;
809 Expected<section_iterator>
810 WasmObjectFile::getSymbolSection(DataRefImpl Symb) const {
812 Ref.d.a = getWasmSymbol(Symb).Section;
813 return section_iterator(SectionRef(Ref, this));
816 void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; }
818 std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec,
819 StringRef &Res) const {
820 const WasmSection &S = Sections[Sec.d.a];
822 case wasm::WASM_SEC_##X: \
837 case wasm::WASM_SEC_CUSTOM:
841 return object_error::invalid_section_index;
844 return std::error_code();
847 uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; }
849 uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const {
853 uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const {
854 const WasmSection &S = Sections[Sec.d.a];
855 return S.Content.size();
858 std::error_code WasmObjectFile::getSectionContents(DataRefImpl Sec,
859 StringRef &Res) const {
860 const WasmSection &S = Sections[Sec.d.a];
861 // This will never fail since wasm sections can never be empty (user-sections
862 // must have a name and non-user sections each have a defined structure).
863 Res = StringRef(reinterpret_cast<const char *>(S.Content.data()),
865 return std::error_code();
868 uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const {
872 bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const {
876 bool WasmObjectFile::isSectionText(DataRefImpl Sec) const {
877 return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE;
880 bool WasmObjectFile::isSectionData(DataRefImpl Sec) const {
881 return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA;
884 bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; }
886 bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; }
888 bool WasmObjectFile::isSectionBitcode(DataRefImpl Sec) const { return false; }
890 relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const {
891 DataRefImpl RelocRef;
892 RelocRef.d.a = Ref.d.a;
894 return relocation_iterator(RelocationRef(RelocRef, this));
897 relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const {
898 const WasmSection &Sec = getWasmSection(Ref);
899 DataRefImpl RelocRef;
900 RelocRef.d.a = Ref.d.a;
901 RelocRef.d.b = Sec.Relocations.size();
902 return relocation_iterator(RelocationRef(RelocRef, this));
905 void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
909 uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const {
910 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
914 symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
915 llvm_unreachable("not yet implemented");
917 return symbol_iterator(Ref);
920 uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const {
921 const wasm::WasmRelocation &Rel = getWasmRelocation(Ref);
925 void WasmObjectFile::getRelocationTypeName(
926 DataRefImpl Ref, SmallVectorImpl<char> &Result) const {
927 const wasm::WasmRelocation& Rel = getWasmRelocation(Ref);
928 StringRef Res = "Unknown";
930 #define WASM_RELOC(name, value) \
936 #include "llvm/BinaryFormat/WasmRelocs/WebAssembly.def"
941 Result.append(Res.begin(), Res.end());
944 section_iterator WasmObjectFile::section_begin() const {
947 return section_iterator(SectionRef(Ref, this));
950 section_iterator WasmObjectFile::section_end() const {
952 Ref.d.a = Sections.size();
953 return section_iterator(SectionRef(Ref, this));
956 uint8_t WasmObjectFile::getBytesInAddress() const { return 4; }
958 StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; }
960 unsigned WasmObjectFile::getArch() const { return Triple::wasm32; }
962 SubtargetFeatures WasmObjectFile::getFeatures() const {
963 return SubtargetFeatures();
966 bool WasmObjectFile::isRelocatableObject() const {
967 return HasLinkingSection;
970 const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const {
971 assert(Ref.d.a < Sections.size());
972 return Sections[Ref.d.a];
976 WasmObjectFile::getWasmSection(const SectionRef &Section) const {
977 return getWasmSection(Section.getRawDataRefImpl());
980 const wasm::WasmRelocation &
981 WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const {
982 return getWasmRelocation(Ref.getRawDataRefImpl());
985 const wasm::WasmRelocation &
986 WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const {
987 assert(Ref.d.a < Sections.size());
988 const WasmSection& Sec = Sections[Ref.d.a];
989 assert(Ref.d.b < Sec.Relocations.size());
990 return Sec.Relocations[Ref.d.b];