| //===- WasmObjectFile.cpp - Wasm object file implementation ---------------===// | |
| // | |
| // The LLVM Compiler Infrastructure | |
| // | |
| // This file is distributed under the University of Illinois Open Source | |
| // License. See LICENSE.TXT for details. | |
| // | |
| //===----------------------------------------------------------------------===// | |
| #include "llvm/ADT/ArrayRef.h" | |
| #include "llvm/ADT/DenseSet.h" | |
| #include "llvm/ADT/STLExtras.h" | |
| #include "llvm/ADT/StringRef.h" | |
| #include "llvm/ADT/StringSet.h" | |
| #include "llvm/ADT/Triple.h" | |
| #include "llvm/BinaryFormat/Wasm.h" | |
| #include "llvm/MC/SubtargetFeature.h" | |
| #include "llvm/Object/Binary.h" | |
| #include "llvm/Object/Error.h" | |
| #include "llvm/Object/ObjectFile.h" | |
| #include "llvm/Object/SymbolicFile.h" | |
| #include "llvm/Object/Wasm.h" | |
| #include "llvm/Support/Endian.h" | |
| #include "llvm/Support/Error.h" | |
| #include "llvm/Support/ErrorHandling.h" | |
| #include "llvm/Support/LEB128.h" | |
| #include <algorithm> | |
| #include <cassert> | |
| #include <cstdint> | |
| #include <cstring> | |
| #include <system_error> | |
| #define DEBUG_TYPE "wasm-object" | |
| using namespace llvm; | |
| using namespace object; | |
| void WasmSymbol::print(raw_ostream &Out) const { | |
| Out << "Name=" << Info.Name | |
| << ", Kind=" << toString(wasm::WasmSymbolType(Info.Kind)) | |
| << ", Flags=" << Info.Flags; | |
| if (!isTypeData()) { | |
| Out << ", ElemIndex=" << Info.ElementIndex; | |
| } else if (isDefined()) { | |
| Out << ", Segment=" << Info.DataRef.Segment; | |
| Out << ", Offset=" << Info.DataRef.Offset; | |
| Out << ", Size=" << Info.DataRef.Size; | |
| } | |
| } | |
| #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP) | |
| LLVM_DUMP_METHOD void WasmSymbol::dump() const { print(dbgs()); } | |
| #endif | |
| Expected<std::unique_ptr<WasmObjectFile>> | |
| ObjectFile::createWasmObjectFile(MemoryBufferRef Buffer) { | |
| Error Err = Error::success(); | |
| auto ObjectFile = llvm::make_unique<WasmObjectFile>(Buffer, Err); | |
| if (Err) | |
| return std::move(Err); | |
| return std::move(ObjectFile); | |
| } | |
| #define VARINT7_MAX ((1<<7)-1) | |
| #define VARINT7_MIN (-(1<<7)) | |
| #define VARUINT7_MAX (1<<7) | |
| #define VARUINT1_MAX (1) | |
| static uint8_t readUint8(WasmObjectFile::ReadContext &Ctx) { | |
| if (Ctx.Ptr == Ctx.End) | |
| report_fatal_error("EOF while reading uint8"); | |
| return *Ctx.Ptr++; | |
| } | |
| static uint32_t readUint32(WasmObjectFile::ReadContext &Ctx) { | |
| if (Ctx.Ptr + 4 > Ctx.End) | |
| report_fatal_error("EOF while reading uint32"); | |
| uint32_t Result = support::endian::read32le(Ctx.Ptr); | |
| Ctx.Ptr += 4; | |
| return Result; | |
| } | |
| static int32_t readFloat32(WasmObjectFile::ReadContext &Ctx) { | |
| int32_t Result = 0; | |
| memcpy(&Result, Ctx.Ptr, sizeof(Result)); | |
| Ctx.Ptr += sizeof(Result); | |
| return Result; | |
| } | |
| static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) { | |
| int64_t Result = 0; | |
| memcpy(&Result, Ctx.Ptr, sizeof(Result)); | |
| Ctx.Ptr += sizeof(Result); | |
| return Result; | |
| } | |
| static uint64_t readULEB128(WasmObjectFile::ReadContext &Ctx) { | |
| unsigned Count; | |
| const char* Error = nullptr; | |
| uint64_t Result = decodeULEB128(Ctx.Ptr, &Count, Ctx.End, &Error); | |
| if (Error) | |
| report_fatal_error(Error); | |
| Ctx.Ptr += Count; | |
| return Result; | |
| } | |
| static StringRef readString(WasmObjectFile::ReadContext &Ctx) { | |
| uint32_t StringLen = readULEB128(Ctx); | |
| if (Ctx.Ptr + StringLen > Ctx.End) | |
| report_fatal_error("EOF while reading string"); | |
| StringRef Return = | |
| StringRef(reinterpret_cast<const char *>(Ctx.Ptr), StringLen); | |
| Ctx.Ptr += StringLen; | |
| return Return; | |
| } | |
| static int64_t readLEB128(WasmObjectFile::ReadContext &Ctx) { | |
| unsigned Count; | |
| const char* Error = nullptr; | |
| uint64_t Result = decodeSLEB128(Ctx.Ptr, &Count, Ctx.End, &Error); | |
| if (Error) | |
| report_fatal_error(Error); | |
| Ctx.Ptr += Count; | |
| return Result; | |
| } | |
| static uint8_t readVaruint1(WasmObjectFile::ReadContext &Ctx) { | |
| int64_t result = readLEB128(Ctx); | |
| if (result > VARUINT1_MAX || result < 0) | |
| report_fatal_error("LEB is outside Varuint1 range"); | |
| return result; | |
| } | |
| static int32_t readVarint32(WasmObjectFile::ReadContext &Ctx) { | |
| int64_t result = readLEB128(Ctx); | |
| if (result > INT32_MAX || result < INT32_MIN) | |
| report_fatal_error("LEB is outside Varint32 range"); | |
| return result; | |
| } | |
| static uint32_t readVaruint32(WasmObjectFile::ReadContext &Ctx) { | |
| uint64_t result = readULEB128(Ctx); | |
| if (result > UINT32_MAX) | |
| report_fatal_error("LEB is outside Varuint32 range"); | |
| return result; | |
| } | |
| static int64_t readVarint64(WasmObjectFile::ReadContext &Ctx) { | |
| return readLEB128(Ctx); | |
| } | |
| static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) { | |
| return readUint8(Ctx); | |
| } | |
| static Error readInitExpr(wasm::WasmInitExpr &Expr, | |
| WasmObjectFile::ReadContext &Ctx) { | |
| Expr.Opcode = readOpcode(Ctx); | |
| switch (Expr.Opcode) { | |
| case wasm::WASM_OPCODE_I32_CONST: | |
| Expr.Value.Int32 = readVarint32(Ctx); | |
| break; | |
| case wasm::WASM_OPCODE_I64_CONST: | |
| Expr.Value.Int64 = readVarint64(Ctx); | |
| break; | |
| case wasm::WASM_OPCODE_F32_CONST: | |
| Expr.Value.Float32 = readFloat32(Ctx); | |
| break; | |
| case wasm::WASM_OPCODE_F64_CONST: | |
| Expr.Value.Float64 = readFloat64(Ctx); | |
| break; | |
| case wasm::WASM_OPCODE_GET_GLOBAL: | |
| Expr.Value.Global = readULEB128(Ctx); | |
| break; | |
| default: | |
| return make_error<GenericBinaryError>("Invalid opcode in init_expr", | |
| object_error::parse_failed); | |
| } | |
| uint8_t EndOpcode = readOpcode(Ctx); | |
| if (EndOpcode != wasm::WASM_OPCODE_END) { | |
| return make_error<GenericBinaryError>("Invalid init_expr", | |
| object_error::parse_failed); | |
| } | |
| return Error::success(); | |
| } | |
| static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) { | |
| wasm::WasmLimits Result; | |
| Result.Flags = readVaruint1(Ctx); | |
| Result.Initial = readVaruint32(Ctx); | |
| if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) | |
| Result.Maximum = readVaruint32(Ctx); | |
| return Result; | |
| } | |
| static wasm::WasmTable readTable(WasmObjectFile::ReadContext &Ctx) { | |
| wasm::WasmTable Table; | |
| Table.ElemType = readUint8(Ctx); | |
| Table.Limits = readLimits(Ctx); | |
| return Table; | |
| } | |
| static Error readSection(WasmSection &Section, | |
| WasmObjectFile::ReadContext &Ctx) { | |
| Section.Offset = Ctx.Ptr - Ctx.Start; | |
| Section.Type = readUint8(Ctx); | |
| LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n"); | |
| uint32_t Size = readVaruint32(Ctx); | |
| if (Size == 0) | |
| return make_error<StringError>("Zero length section", | |
| object_error::parse_failed); | |
| if (Ctx.Ptr + Size > Ctx.End) | |
| return make_error<StringError>("Section too large", | |
| object_error::parse_failed); | |
| if (Section.Type == wasm::WASM_SEC_CUSTOM) { | |
| const uint8_t *NameStart = Ctx.Ptr; | |
| Section.Name = readString(Ctx); | |
| Size -= Ctx.Ptr - NameStart; | |
| } | |
| Section.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); | |
| Ctx.Ptr += Size; | |
| return Error::success(); | |
| } | |
| WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) | |
| : ObjectFile(Binary::ID_Wasm, Buffer) { | |
| ErrorAsOutParameter ErrAsOutParam(&Err); | |
| Header.Magic = getData().substr(0, 4); | |
| if (Header.Magic != StringRef("\0asm", 4)) { | |
| Err = make_error<StringError>("Bad magic number", | |
| object_error::parse_failed); | |
| return; | |
| } | |
| ReadContext Ctx; | |
| Ctx.Start = getPtr(0); | |
| Ctx.Ptr = Ctx.Start + 4; | |
| Ctx.End = Ctx.Start + getData().size(); | |
| if (Ctx.Ptr + 4 > Ctx.End) { | |
| Err = make_error<StringError>("Missing version number", | |
| object_error::parse_failed); | |
| return; | |
| } | |
| Header.Version = readUint32(Ctx); | |
| if (Header.Version != wasm::WasmVersion) { | |
| Err = make_error<StringError>("Bad version number", | |
| object_error::parse_failed); | |
| return; | |
| } | |
| WasmSection Sec; | |
| while (Ctx.Ptr < Ctx.End) { | |
| if ((Err = readSection(Sec, Ctx))) | |
| return; | |
| if ((Err = parseSection(Sec))) | |
| return; | |
| Sections.push_back(Sec); | |
| } | |
| } | |
| Error WasmObjectFile::parseSection(WasmSection &Sec) { | |
| ReadContext Ctx; | |
| Ctx.Start = Sec.Content.data(); | |
| Ctx.End = Ctx.Start + Sec.Content.size(); | |
| Ctx.Ptr = Ctx.Start; | |
| switch (Sec.Type) { | |
| case wasm::WASM_SEC_CUSTOM: | |
| return parseCustomSection(Sec, Ctx); | |
| case wasm::WASM_SEC_TYPE: | |
| return parseTypeSection(Ctx); | |
| case wasm::WASM_SEC_IMPORT: | |
| return parseImportSection(Ctx); | |
| case wasm::WASM_SEC_FUNCTION: | |
| return parseFunctionSection(Ctx); | |
| case wasm::WASM_SEC_TABLE: | |
| return parseTableSection(Ctx); | |
| case wasm::WASM_SEC_MEMORY: | |
| return parseMemorySection(Ctx); | |
| case wasm::WASM_SEC_GLOBAL: | |
| return parseGlobalSection(Ctx); | |
| case wasm::WASM_SEC_EXPORT: | |
| return parseExportSection(Ctx); | |
| case wasm::WASM_SEC_START: | |
| return parseStartSection(Ctx); | |
| case wasm::WASM_SEC_ELEM: | |
| return parseElemSection(Ctx); | |
| case wasm::WASM_SEC_CODE: | |
| return parseCodeSection(Ctx); | |
| case wasm::WASM_SEC_DATA: | |
| return parseDataSection(Ctx); | |
| default: | |
| return make_error<GenericBinaryError>("Bad section type", | |
| object_error::parse_failed); | |
| } | |
| } | |
| Error WasmObjectFile::parseNameSection(ReadContext &Ctx) { | |
| llvm::DenseSet<uint64_t> Seen; | |
| if (Functions.size() != FunctionTypes.size()) { | |
| return make_error<GenericBinaryError>("Names must come after code section", | |
| object_error::parse_failed); | |
| } | |
| while (Ctx.Ptr < Ctx.End) { | |
| uint8_t Type = readUint8(Ctx); | |
| uint32_t Size = readVaruint32(Ctx); | |
| const uint8_t *SubSectionEnd = Ctx.Ptr + Size; | |
| switch (Type) { | |
| case wasm::WASM_NAMES_FUNCTION: { | |
| uint32_t Count = readVaruint32(Ctx); | |
| while (Count--) { | |
| uint32_t Index = readVaruint32(Ctx); | |
| if (!Seen.insert(Index).second) | |
| return make_error<GenericBinaryError>("Function named more than once", | |
| object_error::parse_failed); | |
| StringRef Name = readString(Ctx); | |
| if (!isValidFunctionIndex(Index) || Name.empty()) | |
| return make_error<GenericBinaryError>("Invalid name entry", | |
| object_error::parse_failed); | |
| DebugNames.push_back(wasm::WasmFunctionName{Index, Name}); | |
| if (isDefinedFunctionIndex(Index)) | |
| getDefinedFunction(Index).DebugName = Name; | |
| } | |
| break; | |
| } | |
| // Ignore local names for now | |
| case wasm::WASM_NAMES_LOCAL: | |
| default: | |
| Ctx.Ptr += Size; | |
| break; | |
| } | |
| if (Ctx.Ptr != SubSectionEnd) | |
| return make_error<GenericBinaryError>("Name sub-section ended prematurely", | |
| object_error::parse_failed); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Name section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseLinkingSection(ReadContext &Ctx) { | |
| HasLinkingSection = true; | |
| if (Functions.size() != FunctionTypes.size()) { | |
| return make_error<GenericBinaryError>( | |
| "Linking data must come after code section", object_error::parse_failed); | |
| } | |
| LinkingData.Version = readVaruint32(Ctx); | |
| if (LinkingData.Version != wasm::WasmMetadataVersion) { | |
| return make_error<GenericBinaryError>( | |
| "Unexpected metadata version: " + Twine(LinkingData.Version) + | |
| " (Expected: " + Twine(wasm::WasmMetadataVersion) + ")", | |
| object_error::parse_failed); | |
| } | |
| const uint8_t *OrigEnd = Ctx.End; | |
| while (Ctx.Ptr < OrigEnd) { | |
| Ctx.End = OrigEnd; | |
| uint8_t Type = readUint8(Ctx); | |
| uint32_t Size = readVaruint32(Ctx); | |
| LLVM_DEBUG(dbgs() << "readSubsection type=" << int(Type) << " size=" << Size | |
| << "\n"); | |
| Ctx.End = Ctx.Ptr + Size; | |
| switch (Type) { | |
| case wasm::WASM_SYMBOL_TABLE: | |
| if (Error Err = parseLinkingSectionSymtab(Ctx)) | |
| return Err; | |
| break; | |
| case wasm::WASM_SEGMENT_INFO: { | |
| uint32_t Count = readVaruint32(Ctx); | |
| if (Count > DataSegments.size()) | |
| return make_error<GenericBinaryError>("Too many segment names", | |
| object_error::parse_failed); | |
| for (uint32_t i = 0; i < Count; i++) { | |
| DataSegments[i].Data.Name = readString(Ctx); | |
| DataSegments[i].Data.Alignment = readVaruint32(Ctx); | |
| DataSegments[i].Data.Flags = readVaruint32(Ctx); | |
| } | |
| break; | |
| } | |
| case wasm::WASM_INIT_FUNCS: { | |
| uint32_t Count = readVaruint32(Ctx); | |
| LinkingData.InitFunctions.reserve(Count); | |
| for (uint32_t i = 0; i < Count; i++) { | |
| wasm::WasmInitFunc Init; | |
| Init.Priority = readVaruint32(Ctx); | |
| Init.Symbol = readVaruint32(Ctx); | |
| if (!isValidFunctionSymbol(Init.Symbol)) | |
| return make_error<GenericBinaryError>("Invalid function symbol: " + | |
| Twine(Init.Symbol), | |
| object_error::parse_failed); | |
| LinkingData.InitFunctions.emplace_back(Init); | |
| } | |
| break; | |
| } | |
| case wasm::WASM_COMDAT_INFO: | |
| if (Error Err = parseLinkingSectionComdat(Ctx)) | |
| return Err; | |
| break; | |
| default: | |
| Ctx.Ptr += Size; | |
| break; | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>( | |
| "Linking sub-section ended prematurely", object_error::parse_failed); | |
| } | |
| if (Ctx.Ptr != OrigEnd) | |
| return make_error<GenericBinaryError>("Linking section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseLinkingSectionSymtab(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| LinkingData.SymbolTable.reserve(Count); | |
| Symbols.reserve(Count); | |
| StringSet<> SymbolNames; | |
| std::vector<wasm::WasmImport *> ImportedGlobals; | |
| std::vector<wasm::WasmImport *> ImportedFunctions; | |
| ImportedGlobals.reserve(Imports.size()); | |
| ImportedFunctions.reserve(Imports.size()); | |
| for (auto &I : Imports) { | |
| if (I.Kind == wasm::WASM_EXTERNAL_FUNCTION) | |
| ImportedFunctions.emplace_back(&I); | |
| else if (I.Kind == wasm::WASM_EXTERNAL_GLOBAL) | |
| ImportedGlobals.emplace_back(&I); | |
| } | |
| while (Count--) { | |
| wasm::WasmSymbolInfo Info; | |
| const wasm::WasmSignature *FunctionType = nullptr; | |
| const wasm::WasmGlobalType *GlobalType = nullptr; | |
| Info.Kind = readUint8(Ctx); | |
| Info.Flags = readVaruint32(Ctx); | |
| bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0; | |
| switch (Info.Kind) { | |
| case wasm::WASM_SYMBOL_TYPE_FUNCTION: | |
| Info.ElementIndex = readVaruint32(Ctx); | |
| if (!isValidFunctionIndex(Info.ElementIndex) || | |
| IsDefined != isDefinedFunctionIndex(Info.ElementIndex)) | |
| return make_error<GenericBinaryError>("invalid function symbol index", | |
| object_error::parse_failed); | |
| if (IsDefined) { | |
| Info.Name = readString(Ctx); | |
| unsigned FuncIndex = Info.ElementIndex - NumImportedFunctions; | |
| FunctionType = &Signatures[FunctionTypes[FuncIndex]]; | |
| wasm::WasmFunction &Function = Functions[FuncIndex]; | |
| if (Function.SymbolName.empty()) | |
| Function.SymbolName = Info.Name; | |
| } else { | |
| wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex]; | |
| FunctionType = &Signatures[Import.SigIndex]; | |
| Info.Name = Import.Field; | |
| Info.Module = Import.Module; | |
| } | |
| break; | |
| case wasm::WASM_SYMBOL_TYPE_GLOBAL: | |
| Info.ElementIndex = readVaruint32(Ctx); | |
| if (!isValidGlobalIndex(Info.ElementIndex) || | |
| IsDefined != isDefinedGlobalIndex(Info.ElementIndex)) | |
| return make_error<GenericBinaryError>("invalid global symbol index", | |
| object_error::parse_failed); | |
| if (!IsDefined && | |
| (Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) == | |
| wasm::WASM_SYMBOL_BINDING_WEAK) | |
| return make_error<GenericBinaryError>("undefined weak global symbol", | |
| object_error::parse_failed); | |
| if (IsDefined) { | |
| Info.Name = readString(Ctx); | |
| unsigned GlobalIndex = Info.ElementIndex - NumImportedGlobals; | |
| wasm::WasmGlobal &Global = Globals[GlobalIndex]; | |
| GlobalType = &Global.Type; | |
| if (Global.SymbolName.empty()) | |
| Global.SymbolName = Info.Name; | |
| } else { | |
| wasm::WasmImport &Import = *ImportedGlobals[Info.ElementIndex]; | |
| Info.Name = Import.Field; | |
| GlobalType = &Import.Global; | |
| } | |
| break; | |
| case wasm::WASM_SYMBOL_TYPE_DATA: | |
| Info.Name = readString(Ctx); | |
| if (IsDefined) { | |
| uint32_t Index = readVaruint32(Ctx); | |
| if (Index >= DataSegments.size()) | |
| return make_error<GenericBinaryError>("invalid data symbol index", | |
| object_error::parse_failed); | |
| uint32_t Offset = readVaruint32(Ctx); | |
| uint32_t Size = readVaruint32(Ctx); | |
| if (Offset + Size > DataSegments[Index].Data.Content.size()) | |
| return make_error<GenericBinaryError>("invalid data symbol offset", | |
| object_error::parse_failed); | |
| Info.DataRef = wasm::WasmDataReference{Index, Offset, Size}; | |
| } | |
| break; | |
| case wasm::WASM_SYMBOL_TYPE_SECTION: { | |
| if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != | |
| wasm::WASM_SYMBOL_BINDING_LOCAL) | |
| return make_error<GenericBinaryError>( | |
| "Section symbols must have local binding", | |
| object_error::parse_failed); | |
| Info.ElementIndex = readVaruint32(Ctx); | |
| // Use somewhat unique section name as symbol name. | |
| StringRef SectionName = Sections[Info.ElementIndex].Name; | |
| Info.Name = SectionName; | |
| break; | |
| } | |
| default: | |
| return make_error<GenericBinaryError>("Invalid symbol type", | |
| object_error::parse_failed); | |
| } | |
| if ((Info.Flags & wasm::WASM_SYMBOL_BINDING_MASK) != | |
| wasm::WASM_SYMBOL_BINDING_LOCAL && | |
| !SymbolNames.insert(Info.Name).second) | |
| return make_error<GenericBinaryError>("Duplicate symbol name " + | |
| Twine(Info.Name), | |
| object_error::parse_failed); | |
| LinkingData.SymbolTable.emplace_back(Info); | |
| Symbols.emplace_back(LinkingData.SymbolTable.back(), FunctionType, | |
| GlobalType); | |
| LLVM_DEBUG(dbgs() << "Adding symbol: " << Symbols.back() << "\n"); | |
| } | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseLinkingSectionComdat(ReadContext &Ctx) { | |
| uint32_t ComdatCount = readVaruint32(Ctx); | |
| StringSet<> ComdatSet; | |
| for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) { | |
| StringRef Name = readString(Ctx); | |
| if (Name.empty() || !ComdatSet.insert(Name).second) | |
| return make_error<GenericBinaryError>("Bad/duplicate COMDAT name " + Twine(Name), | |
| object_error::parse_failed); | |
| LinkingData.Comdats.emplace_back(Name); | |
| uint32_t Flags = readVaruint32(Ctx); | |
| if (Flags != 0) | |
| return make_error<GenericBinaryError>("Unsupported COMDAT flags", | |
| object_error::parse_failed); | |
| uint32_t EntryCount = readVaruint32(Ctx); | |
| while (EntryCount--) { | |
| unsigned Kind = readVaruint32(Ctx); | |
| unsigned Index = readVaruint32(Ctx); | |
| switch (Kind) { | |
| default: | |
| return make_error<GenericBinaryError>("Invalid COMDAT entry type", | |
| object_error::parse_failed); | |
| case wasm::WASM_COMDAT_DATA: | |
| if (Index >= DataSegments.size()) | |
| return make_error<GenericBinaryError>("COMDAT data index out of range", | |
| object_error::parse_failed); | |
| if (DataSegments[Index].Data.Comdat != UINT32_MAX) | |
| return make_error<GenericBinaryError>("Data segment in two COMDATs", | |
| object_error::parse_failed); | |
| DataSegments[Index].Data.Comdat = ComdatIndex; | |
| break; | |
| case wasm::WASM_COMDAT_FUNCTION: | |
| if (!isDefinedFunctionIndex(Index)) | |
| return make_error<GenericBinaryError>("COMDAT function index out of range", | |
| object_error::parse_failed); | |
| if (getDefinedFunction(Index).Comdat != UINT32_MAX) | |
| return make_error<GenericBinaryError>("Function in two COMDATs", | |
| object_error::parse_failed); | |
| getDefinedFunction(Index).Comdat = ComdatIndex; | |
| break; | |
| } | |
| } | |
| } | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseRelocSection(StringRef Name, ReadContext &Ctx) { | |
| uint32_t SectionIndex = readVaruint32(Ctx); | |
| if (SectionIndex >= Sections.size()) | |
| return make_error<GenericBinaryError>("Invalid section index", | |
| object_error::parse_failed); | |
| WasmSection& Section = Sections[SectionIndex]; | |
| uint32_t RelocCount = readVaruint32(Ctx); | |
| uint32_t EndOffset = Section.Content.size(); | |
| while (RelocCount--) { | |
| wasm::WasmRelocation Reloc = {}; | |
| Reloc.Type = readVaruint32(Ctx); | |
| Reloc.Offset = readVaruint32(Ctx); | |
| Reloc.Index = readVaruint32(Ctx); | |
| switch (Reloc.Type) { | |
| case wasm::R_WEBASSEMBLY_FUNCTION_INDEX_LEB: | |
| case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB: | |
| case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32: | |
| if (!isValidFunctionSymbol(Reloc.Index)) | |
| return make_error<GenericBinaryError>("Bad relocation function index", | |
| object_error::parse_failed); | |
| break; | |
| case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB: | |
| if (Reloc.Index >= Signatures.size()) | |
| return make_error<GenericBinaryError>("Bad relocation type index", | |
| object_error::parse_failed); | |
| break; | |
| case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB: | |
| if (!isValidGlobalSymbol(Reloc.Index)) | |
| return make_error<GenericBinaryError>("Bad relocation global index", | |
| object_error::parse_failed); | |
| break; | |
| case wasm::R_WEBASSEMBLY_MEMORY_ADDR_LEB: | |
| case wasm::R_WEBASSEMBLY_MEMORY_ADDR_SLEB: | |
| case wasm::R_WEBASSEMBLY_MEMORY_ADDR_I32: | |
| if (!isValidDataSymbol(Reloc.Index)) | |
| return make_error<GenericBinaryError>("Bad relocation data index", | |
| object_error::parse_failed); | |
| Reloc.Addend = readVarint32(Ctx); | |
| break; | |
| case wasm::R_WEBASSEMBLY_FUNCTION_OFFSET_I32: | |
| if (!isValidFunctionSymbol(Reloc.Index)) | |
| return make_error<GenericBinaryError>("Bad relocation function index", | |
| object_error::parse_failed); | |
| Reloc.Addend = readVarint32(Ctx); | |
| break; | |
| case wasm::R_WEBASSEMBLY_SECTION_OFFSET_I32: | |
| if (!isValidSectionSymbol(Reloc.Index)) | |
| return make_error<GenericBinaryError>("Bad relocation section index", | |
| object_error::parse_failed); | |
| Reloc.Addend = readVarint32(Ctx); | |
| break; | |
| default: | |
| return make_error<GenericBinaryError>("Bad relocation type: " + | |
| Twine(Reloc.Type), | |
| object_error::parse_failed); | |
| } | |
| // Relocations must fit inside the section, and must appear in order. They | |
| // also shouldn't overlap a function/element boundary, but we don't bother | |
| // to check that. | |
| uint64_t Size = 5; | |
| if (Reloc.Type == wasm::R_WEBASSEMBLY_TABLE_INDEX_I32 || | |
| Reloc.Type == wasm::R_WEBASSEMBLY_MEMORY_ADDR_I32 || | |
| Reloc.Type == wasm::R_WEBASSEMBLY_SECTION_OFFSET_I32 || | |
| Reloc.Type == wasm::R_WEBASSEMBLY_FUNCTION_OFFSET_I32) | |
| Size = 4; | |
| if (Reloc.Offset + Size > EndOffset) | |
| return make_error<GenericBinaryError>("Bad relocation offset", | |
| object_error::parse_failed); | |
| Section.Relocations.push_back(Reloc); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Reloc section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseCustomSection(WasmSection &Sec, ReadContext &Ctx) { | |
| if (Sec.Name == "name") { | |
| if (Error Err = parseNameSection(Ctx)) | |
| return Err; | |
| } else if (Sec.Name == "linking") { | |
| if (Error Err = parseLinkingSection(Ctx)) | |
| return Err; | |
| } else if (Sec.Name.startswith("reloc.")) { | |
| if (Error Err = parseRelocSection(Sec.Name, Ctx)) | |
| return Err; | |
| } | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseTypeSection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| Signatures.reserve(Count); | |
| while (Count--) { | |
| wasm::WasmSignature Sig; | |
| Sig.ReturnType = wasm::WASM_TYPE_NORESULT; | |
| uint8_t Form = readUint8(Ctx); | |
| if (Form != wasm::WASM_TYPE_FUNC) { | |
| return make_error<GenericBinaryError>("Invalid signature type", | |
| object_error::parse_failed); | |
| } | |
| uint32_t ParamCount = readVaruint32(Ctx); | |
| Sig.ParamTypes.reserve(ParamCount); | |
| while (ParamCount--) { | |
| uint32_t ParamType = readUint8(Ctx); | |
| Sig.ParamTypes.push_back(ParamType); | |
| } | |
| uint32_t ReturnCount = readVaruint32(Ctx); | |
| if (ReturnCount) { | |
| if (ReturnCount != 1) { | |
| return make_error<GenericBinaryError>( | |
| "Multiple return types not supported", object_error::parse_failed); | |
| } | |
| Sig.ReturnType = readUint8(Ctx); | |
| } | |
| Signatures.push_back(Sig); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Type section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseImportSection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| Imports.reserve(Count); | |
| for (uint32_t i = 0; i < Count; i++) { | |
| wasm::WasmImport Im; | |
| Im.Module = readString(Ctx); | |
| Im.Field = readString(Ctx); | |
| Im.Kind = readUint8(Ctx); | |
| switch (Im.Kind) { | |
| case wasm::WASM_EXTERNAL_FUNCTION: | |
| NumImportedFunctions++; | |
| Im.SigIndex = readVaruint32(Ctx); | |
| break; | |
| case wasm::WASM_EXTERNAL_GLOBAL: | |
| NumImportedGlobals++; | |
| Im.Global.Type = readUint8(Ctx); | |
| Im.Global.Mutable = readVaruint1(Ctx); | |
| break; | |
| case wasm::WASM_EXTERNAL_MEMORY: | |
| Im.Memory = readLimits(Ctx); | |
| break; | |
| case wasm::WASM_EXTERNAL_TABLE: | |
| Im.Table = readTable(Ctx); | |
| if (Im.Table.ElemType != wasm::WASM_TYPE_ANYFUNC) | |
| return make_error<GenericBinaryError>("Invalid table element type", | |
| object_error::parse_failed); | |
| break; | |
| default: | |
| return make_error<GenericBinaryError>( | |
| "Unexpected import kind", object_error::parse_failed); | |
| } | |
| Imports.push_back(Im); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Import section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseFunctionSection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| FunctionTypes.reserve(Count); | |
| uint32_t NumTypes = Signatures.size(); | |
| while (Count--) { | |
| uint32_t Type = readVaruint32(Ctx); | |
| if (Type >= NumTypes) | |
| return make_error<GenericBinaryError>("Invalid function type", | |
| object_error::parse_failed); | |
| FunctionTypes.push_back(Type); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Function section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseTableSection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| Tables.reserve(Count); | |
| while (Count--) { | |
| Tables.push_back(readTable(Ctx)); | |
| if (Tables.back().ElemType != wasm::WASM_TYPE_ANYFUNC) { | |
| return make_error<GenericBinaryError>("Invalid table element type", | |
| object_error::parse_failed); | |
| } | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Table section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseMemorySection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| Memories.reserve(Count); | |
| while (Count--) { | |
| Memories.push_back(readLimits(Ctx)); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Memory section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseGlobalSection(ReadContext &Ctx) { | |
| GlobalSection = Sections.size(); | |
| uint32_t Count = readVaruint32(Ctx); | |
| Globals.reserve(Count); | |
| while (Count--) { | |
| wasm::WasmGlobal Global; | |
| Global.Index = NumImportedGlobals + Globals.size(); | |
| Global.Type.Type = readUint8(Ctx); | |
| Global.Type.Mutable = readVaruint1(Ctx); | |
| if (Error Err = readInitExpr(Global.InitExpr, Ctx)) | |
| return Err; | |
| Globals.push_back(Global); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Global section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseExportSection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| Exports.reserve(Count); | |
| for (uint32_t i = 0; i < Count; i++) { | |
| wasm::WasmExport Ex; | |
| Ex.Name = readString(Ctx); | |
| Ex.Kind = readUint8(Ctx); | |
| Ex.Index = readVaruint32(Ctx); | |
| switch (Ex.Kind) { | |
| case wasm::WASM_EXTERNAL_FUNCTION: | |
| if (!isValidFunctionIndex(Ex.Index)) | |
| return make_error<GenericBinaryError>("Invalid function export", | |
| object_error::parse_failed); | |
| break; | |
| case wasm::WASM_EXTERNAL_GLOBAL: | |
| if (!isValidGlobalIndex(Ex.Index)) | |
| return make_error<GenericBinaryError>("Invalid global export", | |
| object_error::parse_failed); | |
| break; | |
| case wasm::WASM_EXTERNAL_MEMORY: | |
| case wasm::WASM_EXTERNAL_TABLE: | |
| break; | |
| default: | |
| return make_error<GenericBinaryError>( | |
| "Unexpected export kind", object_error::parse_failed); | |
| } | |
| Exports.push_back(Ex); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Export section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| bool WasmObjectFile::isValidFunctionIndex(uint32_t Index) const { | |
| return Index < NumImportedFunctions + FunctionTypes.size(); | |
| } | |
| bool WasmObjectFile::isDefinedFunctionIndex(uint32_t Index) const { | |
| return Index >= NumImportedFunctions && isValidFunctionIndex(Index); | |
| } | |
| bool WasmObjectFile::isValidGlobalIndex(uint32_t Index) const { | |
| return Index < NumImportedGlobals + Globals.size(); | |
| } | |
| bool WasmObjectFile::isDefinedGlobalIndex(uint32_t Index) const { | |
| return Index >= NumImportedGlobals && isValidGlobalIndex(Index); | |
| } | |
| bool WasmObjectFile::isValidFunctionSymbol(uint32_t Index) const { | |
| return Index < Symbols.size() && Symbols[Index].isTypeFunction(); | |
| } | |
| bool WasmObjectFile::isValidGlobalSymbol(uint32_t Index) const { | |
| return Index < Symbols.size() && Symbols[Index].isTypeGlobal(); | |
| } | |
| bool WasmObjectFile::isValidDataSymbol(uint32_t Index) const { | |
| return Index < Symbols.size() && Symbols[Index].isTypeData(); | |
| } | |
| bool WasmObjectFile::isValidSectionSymbol(uint32_t Index) const { | |
| return Index < Symbols.size() && Symbols[Index].isTypeSection(); | |
| } | |
| wasm::WasmFunction &WasmObjectFile::getDefinedFunction(uint32_t Index) { | |
| assert(isDefinedFunctionIndex(Index)); | |
| return Functions[Index - NumImportedFunctions]; | |
| } | |
| wasm::WasmGlobal &WasmObjectFile::getDefinedGlobal(uint32_t Index) { | |
| assert(isDefinedGlobalIndex(Index)); | |
| return Globals[Index - NumImportedGlobals]; | |
| } | |
| Error WasmObjectFile::parseStartSection(ReadContext &Ctx) { | |
| StartFunction = readVaruint32(Ctx); | |
| if (!isValidFunctionIndex(StartFunction)) | |
| return make_error<GenericBinaryError>("Invalid start function", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseCodeSection(ReadContext &Ctx) { | |
| CodeSection = Sections.size(); | |
| uint32_t FunctionCount = readVaruint32(Ctx); | |
| if (FunctionCount != FunctionTypes.size()) { | |
| return make_error<GenericBinaryError>("Invalid function count", | |
| object_error::parse_failed); | |
| } | |
| while (FunctionCount--) { | |
| wasm::WasmFunction Function; | |
| const uint8_t *FunctionStart = Ctx.Ptr; | |
| uint32_t Size = readVaruint32(Ctx); | |
| const uint8_t *FunctionEnd = Ctx.Ptr + Size; | |
| Function.CodeOffset = Ctx.Ptr - FunctionStart; | |
| Function.Index = NumImportedFunctions + Functions.size(); | |
| Function.CodeSectionOffset = FunctionStart - Ctx.Start; | |
| Function.Size = FunctionEnd - FunctionStart; | |
| uint32_t NumLocalDecls = readVaruint32(Ctx); | |
| Function.Locals.reserve(NumLocalDecls); | |
| while (NumLocalDecls--) { | |
| wasm::WasmLocalDecl Decl; | |
| Decl.Count = readVaruint32(Ctx); | |
| Decl.Type = readUint8(Ctx); | |
| Function.Locals.push_back(Decl); | |
| } | |
| uint32_t BodySize = FunctionEnd - Ctx.Ptr; | |
| Function.Body = ArrayRef<uint8_t>(Ctx.Ptr, BodySize); | |
| // This will be set later when reading in the linking metadata section. | |
| Function.Comdat = UINT32_MAX; | |
| Ctx.Ptr += BodySize; | |
| assert(Ctx.Ptr == FunctionEnd); | |
| Functions.push_back(Function); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Code section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseElemSection(ReadContext &Ctx) { | |
| uint32_t Count = readVaruint32(Ctx); | |
| ElemSegments.reserve(Count); | |
| while (Count--) { | |
| wasm::WasmElemSegment Segment; | |
| Segment.TableIndex = readVaruint32(Ctx); | |
| if (Segment.TableIndex != 0) { | |
| return make_error<GenericBinaryError>("Invalid TableIndex", | |
| object_error::parse_failed); | |
| } | |
| if (Error Err = readInitExpr(Segment.Offset, Ctx)) | |
| return Err; | |
| uint32_t NumElems = readVaruint32(Ctx); | |
| while (NumElems--) { | |
| Segment.Functions.push_back(readVaruint32(Ctx)); | |
| } | |
| ElemSegments.push_back(Segment); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Elem section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| Error WasmObjectFile::parseDataSection(ReadContext &Ctx) { | |
| DataSection = Sections.size(); | |
| uint32_t Count = readVaruint32(Ctx); | |
| DataSegments.reserve(Count); | |
| while (Count--) { | |
| WasmSegment Segment; | |
| Segment.Data.MemoryIndex = readVaruint32(Ctx); | |
| if (Error Err = readInitExpr(Segment.Data.Offset, Ctx)) | |
| return Err; | |
| uint32_t Size = readVaruint32(Ctx); | |
| if (Size > (size_t)(Ctx.End - Ctx.Ptr)) | |
| return make_error<GenericBinaryError>("Invalid segment size", | |
| object_error::parse_failed); | |
| Segment.Data.Content = ArrayRef<uint8_t>(Ctx.Ptr, Size); | |
| // The rest of these Data fields are set later, when reading in the linking | |
| // metadata section. | |
| Segment.Data.Alignment = 0; | |
| Segment.Data.Flags = 0; | |
| Segment.Data.Comdat = UINT32_MAX; | |
| Segment.SectionOffset = Ctx.Ptr - Ctx.Start; | |
| Ctx.Ptr += Size; | |
| DataSegments.push_back(Segment); | |
| } | |
| if (Ctx.Ptr != Ctx.End) | |
| return make_error<GenericBinaryError>("Data section ended prematurely", | |
| object_error::parse_failed); | |
| return Error::success(); | |
| } | |
| const uint8_t *WasmObjectFile::getPtr(size_t Offset) const { | |
| return reinterpret_cast<const uint8_t *>(getData().data() + Offset); | |
| } | |
| const wasm::WasmObjectHeader &WasmObjectFile::getHeader() const { | |
| return Header; | |
| } | |
| void WasmObjectFile::moveSymbolNext(DataRefImpl &Symb) const { Symb.d.a++; } | |
| uint32_t WasmObjectFile::getSymbolFlags(DataRefImpl Symb) const { | |
| uint32_t Result = SymbolRef::SF_None; | |
| const WasmSymbol &Sym = getWasmSymbol(Symb); | |
| LLVM_DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); | |
| if (Sym.isBindingWeak()) | |
| Result |= SymbolRef::SF_Weak; | |
| if (!Sym.isBindingLocal()) | |
| Result |= SymbolRef::SF_Global; | |
| if (Sym.isHidden()) | |
| Result |= SymbolRef::SF_Hidden; | |
| if (!Sym.isDefined()) | |
| Result |= SymbolRef::SF_Undefined; | |
| if (Sym.isTypeFunction()) | |
| Result |= SymbolRef::SF_Executable; | |
| return Result; | |
| } | |
| basic_symbol_iterator WasmObjectFile::symbol_begin() const { | |
| DataRefImpl Ref; | |
| Ref.d.a = 0; | |
| return BasicSymbolRef(Ref, this); | |
| } | |
| basic_symbol_iterator WasmObjectFile::symbol_end() const { | |
| DataRefImpl Ref; | |
| Ref.d.a = Symbols.size(); | |
| return BasicSymbolRef(Ref, this); | |
| } | |
| const WasmSymbol &WasmObjectFile::getWasmSymbol(const DataRefImpl &Symb) const { | |
| return Symbols[Symb.d.a]; | |
| } | |
| const WasmSymbol &WasmObjectFile::getWasmSymbol(const SymbolRef &Symb) const { | |
| return getWasmSymbol(Symb.getRawDataRefImpl()); | |
| } | |
| Expected<StringRef> WasmObjectFile::getSymbolName(DataRefImpl Symb) const { | |
| return getWasmSymbol(Symb).Info.Name; | |
| } | |
| Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { | |
| return getSymbolValue(Symb); | |
| } | |
| uint64_t WasmObjectFile::getWasmSymbolValue(const WasmSymbol& Sym) const { | |
| switch (Sym.Info.Kind) { | |
| case wasm::WASM_SYMBOL_TYPE_FUNCTION: | |
| case wasm::WASM_SYMBOL_TYPE_GLOBAL: | |
| return Sym.Info.ElementIndex; | |
| case wasm::WASM_SYMBOL_TYPE_DATA: { | |
| // The value of a data symbol is the segment offset, plus the symbol | |
| // offset within the segment. | |
| uint32_t SegmentIndex = Sym.Info.DataRef.Segment; | |
| const wasm::WasmDataSegment &Segment = DataSegments[SegmentIndex].Data; | |
| assert(Segment.Offset.Opcode == wasm::WASM_OPCODE_I32_CONST); | |
| return Segment.Offset.Value.Int32 + Sym.Info.DataRef.Offset; | |
| } | |
| case wasm::WASM_SYMBOL_TYPE_SECTION: | |
| return 0; | |
| } | |
| llvm_unreachable("invalid symbol type"); | |
| } | |
| uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { | |
| return getWasmSymbolValue(getWasmSymbol(Symb)); | |
| } | |
| uint32_t WasmObjectFile::getSymbolAlignment(DataRefImpl Symb) const { | |
| llvm_unreachable("not yet implemented"); | |
| return 0; | |
| } | |
| uint64_t WasmObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const { | |
| llvm_unreachable("not yet implemented"); | |
| return 0; | |
| } | |
| Expected<SymbolRef::Type> | |
| WasmObjectFile::getSymbolType(DataRefImpl Symb) const { | |
| const WasmSymbol &Sym = getWasmSymbol(Symb); | |
| switch (Sym.Info.Kind) { | |
| case wasm::WASM_SYMBOL_TYPE_FUNCTION: | |
| return SymbolRef::ST_Function; | |
| case wasm::WASM_SYMBOL_TYPE_GLOBAL: | |
| return SymbolRef::ST_Other; | |
| case wasm::WASM_SYMBOL_TYPE_DATA: | |
| return SymbolRef::ST_Data; | |
| case wasm::WASM_SYMBOL_TYPE_SECTION: | |
| return SymbolRef::ST_Debug; | |
| } | |
| llvm_unreachable("Unknown WasmSymbol::SymbolType"); | |
| return SymbolRef::ST_Other; | |
| } | |
| Expected<section_iterator> | |
| WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { | |
| const WasmSymbol& Sym = getWasmSymbol(Symb); | |
| if (Sym.isUndefined()) | |
| return section_end(); | |
| DataRefImpl Ref; | |
| switch (Sym.Info.Kind) { | |
| case wasm::WASM_SYMBOL_TYPE_FUNCTION: | |
| Ref.d.a = CodeSection; | |
| break; | |
| case wasm::WASM_SYMBOL_TYPE_GLOBAL: | |
| Ref.d.a = GlobalSection; | |
| break; | |
| case wasm::WASM_SYMBOL_TYPE_DATA: | |
| Ref.d.a = DataSection; | |
| break; | |
| case wasm::WASM_SYMBOL_TYPE_SECTION: { | |
| Ref.d.a = Sym.Info.ElementIndex; | |
| break; | |
| } | |
| default: | |
| llvm_unreachable("Unknown WasmSymbol::SymbolType"); | |
| } | |
| return section_iterator(SectionRef(Ref, this)); | |
| } | |
| void WasmObjectFile::moveSectionNext(DataRefImpl &Sec) const { Sec.d.a++; } | |
| std::error_code WasmObjectFile::getSectionName(DataRefImpl Sec, | |
| StringRef &Res) const { | |
| const WasmSection &S = Sections[Sec.d.a]; | |
| #define ECase(X) \ | |
| case wasm::WASM_SEC_##X: \ | |
| Res = #X; \ | |
| break | |
| switch (S.Type) { | |
| ECase(TYPE); | |
| ECase(IMPORT); | |
| ECase(FUNCTION); | |
| ECase(TABLE); | |
| ECase(MEMORY); | |
| ECase(GLOBAL); | |
| ECase(EXPORT); | |
| ECase(START); | |
| ECase(ELEM); | |
| ECase(CODE); | |
| ECase(DATA); | |
| case wasm::WASM_SEC_CUSTOM: | |
| Res = S.Name; | |
| break; | |
| default: | |
| return object_error::invalid_section_index; | |
| } | |
| #undef ECase | |
| return std::error_code(); | |
| } | |
| uint64_t WasmObjectFile::getSectionAddress(DataRefImpl Sec) const { return 0; } | |
| uint64_t WasmObjectFile::getSectionIndex(DataRefImpl Sec) const { | |
| return Sec.d.a; | |
| } | |
| uint64_t WasmObjectFile::getSectionSize(DataRefImpl Sec) const { | |
| const WasmSection &S = Sections[Sec.d.a]; | |
| return S.Content.size(); | |
| } | |
| std::error_code WasmObjectFile::getSectionContents(DataRefImpl Sec, | |
| StringRef &Res) const { | |
| const WasmSection &S = Sections[Sec.d.a]; | |
| // This will never fail since wasm sections can never be empty (user-sections | |
| // must have a name and non-user sections each have a defined structure). | |
| Res = StringRef(reinterpret_cast<const char *>(S.Content.data()), | |
| S.Content.size()); | |
| return std::error_code(); | |
| } | |
| uint64_t WasmObjectFile::getSectionAlignment(DataRefImpl Sec) const { | |
| return 1; | |
| } | |
| bool WasmObjectFile::isSectionCompressed(DataRefImpl Sec) const { | |
| return false; | |
| } | |
| bool WasmObjectFile::isSectionText(DataRefImpl Sec) const { | |
| return getWasmSection(Sec).Type == wasm::WASM_SEC_CODE; | |
| } | |
| bool WasmObjectFile::isSectionData(DataRefImpl Sec) const { | |
| return getWasmSection(Sec).Type == wasm::WASM_SEC_DATA; | |
| } | |
| bool WasmObjectFile::isSectionBSS(DataRefImpl Sec) const { return false; } | |
| bool WasmObjectFile::isSectionVirtual(DataRefImpl Sec) const { return false; } | |
| bool WasmObjectFile::isSectionBitcode(DataRefImpl Sec) const { return false; } | |
| relocation_iterator WasmObjectFile::section_rel_begin(DataRefImpl Ref) const { | |
| DataRefImpl RelocRef; | |
| RelocRef.d.a = Ref.d.a; | |
| RelocRef.d.b = 0; | |
| return relocation_iterator(RelocationRef(RelocRef, this)); | |
| } | |
| relocation_iterator WasmObjectFile::section_rel_end(DataRefImpl Ref) const { | |
| const WasmSection &Sec = getWasmSection(Ref); | |
| DataRefImpl RelocRef; | |
| RelocRef.d.a = Ref.d.a; | |
| RelocRef.d.b = Sec.Relocations.size(); | |
| return relocation_iterator(RelocationRef(RelocRef, this)); | |
| } | |
| void WasmObjectFile::moveRelocationNext(DataRefImpl &Rel) const { | |
| Rel.d.b++; | |
| } | |
| uint64_t WasmObjectFile::getRelocationOffset(DataRefImpl Ref) const { | |
| const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); | |
| return Rel.Offset; | |
| } | |
| symbol_iterator WasmObjectFile::getRelocationSymbol(DataRefImpl Ref) const { | |
| const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); | |
| if (Rel.Type == wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB) | |
| return symbol_end(); | |
| DataRefImpl Sym; | |
| Sym.d.a = Rel.Index; | |
| Sym.d.b = 0; | |
| return symbol_iterator(SymbolRef(Sym, this)); | |
| } | |
| uint64_t WasmObjectFile::getRelocationType(DataRefImpl Ref) const { | |
| const wasm::WasmRelocation &Rel = getWasmRelocation(Ref); | |
| return Rel.Type; | |
| } | |
| void WasmObjectFile::getRelocationTypeName( | |
| DataRefImpl Ref, SmallVectorImpl<char> &Result) const { | |
| const wasm::WasmRelocation& Rel = getWasmRelocation(Ref); | |
| StringRef Res = "Unknown"; | |
| #define WASM_RELOC(name, value) \ | |
| case wasm::name: \ | |
| Res = #name; \ | |
| break; | |
| switch (Rel.Type) { | |
| #include "llvm/BinaryFormat/WasmRelocs.def" | |
| } | |
| #undef WASM_RELOC | |
| Result.append(Res.begin(), Res.end()); | |
| } | |
| section_iterator WasmObjectFile::section_begin() const { | |
| DataRefImpl Ref; | |
| Ref.d.a = 0; | |
| return section_iterator(SectionRef(Ref, this)); | |
| } | |
| section_iterator WasmObjectFile::section_end() const { | |
| DataRefImpl Ref; | |
| Ref.d.a = Sections.size(); | |
| return section_iterator(SectionRef(Ref, this)); | |
| } | |
| uint8_t WasmObjectFile::getBytesInAddress() const { return 4; } | |
| StringRef WasmObjectFile::getFileFormatName() const { return "WASM"; } | |
| Triple::ArchType WasmObjectFile::getArch() const { return Triple::wasm32; } | |
| SubtargetFeatures WasmObjectFile::getFeatures() const { | |
| return SubtargetFeatures(); | |
| } | |
| bool WasmObjectFile::isRelocatableObject() const { | |
| return HasLinkingSection; | |
| } | |
| const WasmSection &WasmObjectFile::getWasmSection(DataRefImpl Ref) const { | |
| assert(Ref.d.a < Sections.size()); | |
| return Sections[Ref.d.a]; | |
| } | |
| const WasmSection & | |
| WasmObjectFile::getWasmSection(const SectionRef &Section) const { | |
| return getWasmSection(Section.getRawDataRefImpl()); | |
| } | |
| const wasm::WasmRelocation & | |
| WasmObjectFile::getWasmRelocation(const RelocationRef &Ref) const { | |
| return getWasmRelocation(Ref.getRawDataRefImpl()); | |
| } | |
| const wasm::WasmRelocation & | |
| WasmObjectFile::getWasmRelocation(DataRefImpl Ref) const { | |
| assert(Ref.d.a < Sections.size()); | |
| const WasmSection& Sec = Sections[Ref.d.a]; | |
| assert(Ref.d.b < Sec.Relocations.size()); | |
| return Sec.Relocations[Ref.d.b]; | |
| } |