| //===- 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/STLExtras.h" |
| #include "llvm/ADT/StringRef.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; |
| |
| 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(const uint8_t *&Ptr) { return *Ptr++; } |
| |
| static uint32_t readUint32(const uint8_t *&Ptr) { |
| uint32_t Result = support::endian::read32le(Ptr); |
| Ptr += sizeof(Result); |
| return Result; |
| } |
| |
| static int32_t readFloat32(const uint8_t *&Ptr) { |
| int32_t Result = 0; |
| memcpy(&Result, Ptr, sizeof(Result)); |
| Ptr += sizeof(Result); |
| return Result; |
| } |
| |
| static int64_t readFloat64(const uint8_t *&Ptr) { |
| int64_t Result = 0; |
| memcpy(&Result, Ptr, sizeof(Result)); |
| Ptr += sizeof(Result); |
| return Result; |
| } |
| |
| static uint64_t readULEB128(const uint8_t *&Ptr) { |
| unsigned Count; |
| uint64_t Result = decodeULEB128(Ptr, &Count); |
| Ptr += Count; |
| return Result; |
| } |
| |
| static StringRef readString(const uint8_t *&Ptr) { |
| uint32_t StringLen = readULEB128(Ptr); |
| StringRef Return = StringRef(reinterpret_cast<const char *>(Ptr), StringLen); |
| Ptr += StringLen; |
| return Return; |
| } |
| |
| static int64_t readLEB128(const uint8_t *&Ptr) { |
| unsigned Count; |
| uint64_t Result = decodeSLEB128(Ptr, &Count); |
| Ptr += Count; |
| return Result; |
| } |
| |
| static uint8_t readVaruint1(const uint8_t *&Ptr) { |
| int64_t result = readLEB128(Ptr); |
| assert(result <= VARUINT1_MAX && result >= 0); |
| return result; |
| } |
| |
| static int8_t readVarint7(const uint8_t *&Ptr) { |
| int64_t result = readLEB128(Ptr); |
| assert(result <= VARINT7_MAX && result >= VARINT7_MIN); |
| return result; |
| } |
| |
| static uint8_t readVaruint7(const uint8_t *&Ptr) { |
| uint64_t result = readULEB128(Ptr); |
| assert(result <= VARUINT7_MAX); |
| return result; |
| } |
| |
| static int32_t readVarint32(const uint8_t *&Ptr) { |
| int64_t result = readLEB128(Ptr); |
| assert(result <= INT32_MAX && result >= INT32_MIN); |
| return result; |
| } |
| |
| static uint32_t readVaruint32(const uint8_t *&Ptr) { |
| uint64_t result = readULEB128(Ptr); |
| assert(result <= UINT32_MAX); |
| return result; |
| } |
| |
| static int64_t readVarint64(const uint8_t *&Ptr) { |
| return readLEB128(Ptr); |
| } |
| |
| static uint8_t readOpcode(const uint8_t *&Ptr) { |
| return readUint8(Ptr); |
| } |
| |
| static Error readInitExpr(wasm::WasmInitExpr &Expr, const uint8_t *&Ptr) { |
| Expr.Opcode = readOpcode(Ptr); |
| |
| switch (Expr.Opcode) { |
| case wasm::WASM_OPCODE_I32_CONST: |
| Expr.Value.Int32 = readVarint32(Ptr); |
| break; |
| case wasm::WASM_OPCODE_I64_CONST: |
| Expr.Value.Int64 = readVarint64(Ptr); |
| break; |
| case wasm::WASM_OPCODE_F32_CONST: |
| Expr.Value.Float32 = readFloat32(Ptr); |
| break; |
| case wasm::WASM_OPCODE_F64_CONST: |
| Expr.Value.Float64 = readFloat64(Ptr); |
| break; |
| case wasm::WASM_OPCODE_GET_GLOBAL: |
| Expr.Value.Global = readULEB128(Ptr); |
| break; |
| default: |
| return make_error<GenericBinaryError>("Invalid opcode in init_expr", |
| object_error::parse_failed); |
| } |
| |
| uint8_t EndOpcode = readOpcode(Ptr); |
| if (EndOpcode != wasm::WASM_OPCODE_END) { |
| return make_error<GenericBinaryError>("Invalid init_expr", |
| object_error::parse_failed); |
| } |
| return Error::success(); |
| } |
| |
| static wasm::WasmLimits readLimits(const uint8_t *&Ptr) { |
| wasm::WasmLimits Result; |
| Result.Flags = readVaruint1(Ptr); |
| Result.Initial = readVaruint32(Ptr); |
| if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX) |
| Result.Maximum = readVaruint32(Ptr); |
| return Result; |
| } |
| |
| static wasm::WasmTable readTable(const uint8_t *&Ptr) { |
| wasm::WasmTable Table; |
| Table.ElemType = readVarint7(Ptr); |
| Table.Limits = readLimits(Ptr); |
| return Table; |
| } |
| |
| static Error readSection(WasmSection &Section, const uint8_t *&Ptr, |
| const uint8_t *Start) { |
| // TODO(sbc): Avoid reading past EOF in the case of malformed files. |
| Section.Offset = Ptr - Start; |
| Section.Type = readVaruint7(Ptr); |
| uint32_t Size = readVaruint32(Ptr); |
| if (Size == 0) |
| return make_error<StringError>("Zero length section", |
| object_error::parse_failed); |
| Section.Content = ArrayRef<uint8_t>(Ptr, Size); |
| Ptr += Size; |
| return Error::success(); |
| } |
| |
| WasmObjectFile::WasmObjectFile(MemoryBufferRef Buffer, Error &Err) |
| : ObjectFile(Binary::ID_Wasm, Buffer) { |
| LinkingData.DataAlignment = 0; |
| LinkingData.DataSize = 0; |
| |
| 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; |
| } |
| const uint8_t *Ptr = getPtr(4); |
| Header.Version = readUint32(Ptr); |
| if (Header.Version != wasm::WasmVersion) { |
| Err = make_error<StringError>("Bad version number", |
| object_error::parse_failed); |
| return; |
| } |
| |
| const uint8_t *Eof = getPtr(getData().size()); |
| WasmSection Sec; |
| while (Ptr < Eof) { |
| if ((Err = readSection(Sec, Ptr, getPtr(0)))) |
| return; |
| if ((Err = parseSection(Sec))) |
| return; |
| |
| Sections.push_back(Sec); |
| } |
| } |
| |
| Error WasmObjectFile::parseSection(WasmSection &Sec) { |
| const uint8_t* Start = Sec.Content.data(); |
| const uint8_t* End = Start + Sec.Content.size(); |
| switch (Sec.Type) { |
| case wasm::WASM_SEC_CUSTOM: |
| return parseCustomSection(Sec, Start, End); |
| case wasm::WASM_SEC_TYPE: |
| return parseTypeSection(Start, End); |
| case wasm::WASM_SEC_IMPORT: |
| return parseImportSection(Start, End); |
| case wasm::WASM_SEC_FUNCTION: |
| return parseFunctionSection(Start, End); |
| case wasm::WASM_SEC_TABLE: |
| return parseTableSection(Start, End); |
| case wasm::WASM_SEC_MEMORY: |
| return parseMemorySection(Start, End); |
| case wasm::WASM_SEC_GLOBAL: |
| return parseGlobalSection(Start, End); |
| case wasm::WASM_SEC_EXPORT: |
| return parseExportSection(Start, End); |
| case wasm::WASM_SEC_START: |
| return parseStartSection(Start, End); |
| case wasm::WASM_SEC_ELEM: |
| return parseElemSection(Start, End); |
| case wasm::WASM_SEC_CODE: |
| return parseCodeSection(Start, End); |
| case wasm::WASM_SEC_DATA: |
| return parseDataSection(Start, End); |
| default: |
| return make_error<GenericBinaryError>("Bad section type", |
| object_error::parse_failed); |
| } |
| } |
| |
| Error WasmObjectFile::parseNameSection(const uint8_t *Ptr, const uint8_t *End) { |
| while (Ptr < End) { |
| uint8_t Type = readVarint7(Ptr); |
| uint32_t Size = readVaruint32(Ptr); |
| const uint8_t *SubSectionEnd = Ptr + Size; |
| switch (Type) { |
| case wasm::WASM_NAMES_FUNCTION: { |
| uint32_t Count = readVaruint32(Ptr); |
| while (Count--) { |
| uint32_t Index = readVaruint32(Ptr); |
| StringRef Name = readString(Ptr); |
| if (!Name.empty()) |
| Symbols.emplace_back(Name, |
| WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME, |
| Sections.size(), Index); |
| } |
| break; |
| } |
| // Ignore local names for now |
| case wasm::WASM_NAMES_LOCAL: |
| default: |
| Ptr += Size; |
| break; |
| } |
| if (Ptr != SubSectionEnd) |
| return make_error<GenericBinaryError>("Name sub-section ended prematurely", |
| object_error::parse_failed); |
| } |
| |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Name section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr, |
| const uint8_t *End) { |
| HasLinkingSection = true; |
| while (Ptr < End) { |
| uint8_t Type = readVarint7(Ptr); |
| uint32_t Size = readVaruint32(Ptr); |
| const uint8_t *SubSectionEnd = Ptr + Size; |
| switch (Type) { |
| case wasm::WASM_SYMBOL_INFO: { |
| uint32_t Count = readVaruint32(Ptr); |
| while (Count--) { |
| StringRef Symbol = readString(Ptr); |
| DEBUG(dbgs() << "reading syminfo: " << Symbol << "\n"); |
| uint32_t Flags = readVaruint32(Ptr); |
| auto iter = SymbolMap.find(Symbol); |
| if (iter == SymbolMap.end()) { |
| return make_error<GenericBinaryError>( |
| "Invalid symbol name in linking section: " + Symbol, |
| object_error::parse_failed); |
| } |
| uint32_t SymIndex = iter->second; |
| assert(SymIndex < Symbols.size()); |
| Symbols[SymIndex].Flags = Flags; |
| DEBUG(dbgs() << "Set symbol flags index:" |
| << SymIndex << " name:" |
| << Symbols[SymIndex].Name << " exptected:" |
| << Symbol << " flags: " << Flags << "\n"); |
| } |
| break; |
| } |
| case wasm::WASM_DATA_SIZE: |
| LinkingData.DataSize = readVaruint32(Ptr); |
| break; |
| case wasm::WASM_DATA_ALIGNMENT: |
| LinkingData.DataAlignment = readVaruint32(Ptr); |
| break; |
| case wasm::WASM_STACK_POINTER: |
| default: |
| Ptr += Size; |
| break; |
| } |
| if (Ptr != SubSectionEnd) |
| return make_error<GenericBinaryError>( |
| "Linking sub-section ended prematurely", object_error::parse_failed); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Linking section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| WasmSection* WasmObjectFile::findCustomSectionByName(StringRef Name) { |
| for (WasmSection& Section : Sections) { |
| if (Section.Type == wasm::WASM_SEC_CUSTOM && Section.Name == Name) |
| return &Section; |
| } |
| return nullptr; |
| } |
| |
| WasmSection* WasmObjectFile::findSectionByType(uint32_t Type) { |
| assert(Type != wasm::WASM_SEC_CUSTOM); |
| for (WasmSection& Section : Sections) { |
| if (Section.Type == Type) |
| return &Section; |
| } |
| return nullptr; |
| } |
| |
| Error WasmObjectFile::parseRelocSection(StringRef Name, const uint8_t *Ptr, |
| const uint8_t *End) { |
| uint8_t SectionCode = readVarint7(Ptr); |
| WasmSection* Section = nullptr; |
| if (SectionCode == wasm::WASM_SEC_CUSTOM) { |
| StringRef Name = readString(Ptr); |
| Section = findCustomSectionByName(Name); |
| } else { |
| Section = findSectionByType(SectionCode); |
| } |
| if (!Section) |
| return make_error<GenericBinaryError>("Invalid section code", |
| object_error::parse_failed); |
| uint32_t RelocCount = readVaruint32(Ptr); |
| while (RelocCount--) { |
| wasm::WasmRelocation Reloc; |
| memset(&Reloc, 0, sizeof(Reloc)); |
| Reloc.Type = readVaruint32(Ptr); |
| Reloc.Offset = readVaruint32(Ptr); |
| Reloc.Index = readVaruint32(Ptr); |
| switch (Reloc.Type) { |
| case wasm::R_WEBASSEMBLY_FUNCTION_INDEX_LEB: |
| case wasm::R_WEBASSEMBLY_TABLE_INDEX_SLEB: |
| case wasm::R_WEBASSEMBLY_TABLE_INDEX_I32: |
| case wasm::R_WEBASSEMBLY_TYPE_INDEX_LEB: |
| case wasm::R_WEBASSEMBLY_GLOBAL_INDEX_LEB: |
| break; |
| case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_LEB: |
| case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_SLEB: |
| case wasm::R_WEBASSEMBLY_GLOBAL_ADDR_I32: |
| Reloc.Addend = readVarint32(Ptr); |
| break; |
| default: |
| return make_error<GenericBinaryError>("Bad relocation type: " + |
| Twine(Reloc.Type), |
| object_error::parse_failed); |
| } |
| Section->Relocations.push_back(Reloc); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Reloc section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseCustomSection(WasmSection &Sec, |
| const uint8_t *Ptr, const uint8_t *End) { |
| Sec.Name = readString(Ptr); |
| if (Sec.Name == "name") { |
| if (Error Err = parseNameSection(Ptr, End)) |
| return Err; |
| } else if (Sec.Name == "linking") { |
| if (Error Err = parseLinkingSection(Ptr, End)) |
| return Err; |
| } else if (Sec.Name.startswith("reloc.")) { |
| if (Error Err = parseRelocSection(Sec.Name, Ptr, End)) |
| return Err; |
| } |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseTypeSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| Signatures.reserve(Count); |
| while (Count--) { |
| wasm::WasmSignature Sig; |
| Sig.ReturnType = wasm::WASM_TYPE_NORESULT; |
| int8_t Form = readVarint7(Ptr); |
| if (Form != wasm::WASM_TYPE_FUNC) { |
| return make_error<GenericBinaryError>("Invalid signature type", |
| object_error::parse_failed); |
| } |
| uint32_t ParamCount = readVaruint32(Ptr); |
| Sig.ParamTypes.reserve(ParamCount); |
| while (ParamCount--) { |
| uint32_t ParamType = readVarint7(Ptr); |
| Sig.ParamTypes.push_back(ParamType); |
| } |
| uint32_t ReturnCount = readVaruint32(Ptr); |
| if (ReturnCount) { |
| if (ReturnCount != 1) { |
| return make_error<GenericBinaryError>( |
| "Multiple return types not supported", object_error::parse_failed); |
| } |
| Sig.ReturnType = readVarint7(Ptr); |
| } |
| Signatures.push_back(Sig); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Type section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseImportSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| Imports.reserve(Count); |
| for (uint32_t i = 0; i < Count; i++) { |
| wasm::WasmImport Im; |
| Im.Module = readString(Ptr); |
| Im.Field = readString(Ptr); |
| Im.Kind = readUint8(Ptr); |
| switch (Im.Kind) { |
| case wasm::WASM_EXTERNAL_FUNCTION: |
| Im.SigIndex = readVaruint32(Ptr); |
| SymbolMap.try_emplace(Im.Field, Symbols.size()); |
| Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::FUNCTION_IMPORT, |
| Sections.size(), i); |
| DEBUG(dbgs() << "Adding import: " << Symbols.back() |
| << " sym index:" << Symbols.size() << "\n"); |
| break; |
| case wasm::WASM_EXTERNAL_GLOBAL: |
| Im.Global.Type = readVarint7(Ptr); |
| Im.Global.Mutable = readVaruint1(Ptr); |
| SymbolMap.try_emplace(Im.Field, Symbols.size()); |
| Symbols.emplace_back(Im.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT, |
| Sections.size(), i); |
| DEBUG(dbgs() << "Adding import: " << Symbols.back() |
| << " sym index:" << Symbols.size() << "\n"); |
| break; |
| case wasm::WASM_EXTERNAL_MEMORY: |
| Im.Memory = readLimits(Ptr); |
| break; |
| case wasm::WASM_EXTERNAL_TABLE: |
| Im.Table = readTable(Ptr); |
| 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 (Ptr != End) |
| return make_error<GenericBinaryError>("Import section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseFunctionSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| FunctionTypes.reserve(Count); |
| while (Count--) { |
| FunctionTypes.push_back(readVaruint32(Ptr)); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Function section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseTableSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| Tables.reserve(Count); |
| while (Count--) { |
| Tables.push_back(readTable(Ptr)); |
| if (Tables.back().ElemType != wasm::WASM_TYPE_ANYFUNC) { |
| return make_error<GenericBinaryError>("Invalid table element type", |
| object_error::parse_failed); |
| } |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Table section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseMemorySection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| Memories.reserve(Count); |
| while (Count--) { |
| Memories.push_back(readLimits(Ptr)); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Memory section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseGlobalSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| Globals.reserve(Count); |
| while (Count--) { |
| wasm::WasmGlobal Global; |
| Global.Type = readVarint7(Ptr); |
| Global.Mutable = readVaruint1(Ptr); |
| if (Error Err = readInitExpr(Global.InitExpr, Ptr)) |
| return Err; |
| Globals.push_back(Global); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Global section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseExportSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| Exports.reserve(Count); |
| for (uint32_t i = 0; i < Count; i++) { |
| wasm::WasmExport Ex; |
| Ex.Name = readString(Ptr); |
| Ex.Kind = readUint8(Ptr); |
| Ex.Index = readVaruint32(Ptr); |
| WasmSymbol::SymbolType ExportType; |
| bool MakeSymbol = false; |
| switch (Ex.Kind) { |
| case wasm::WASM_EXTERNAL_FUNCTION: |
| ExportType = WasmSymbol::SymbolType::FUNCTION_EXPORT; |
| MakeSymbol = true; |
| break; |
| case wasm::WASM_EXTERNAL_GLOBAL: |
| ExportType = WasmSymbol::SymbolType::GLOBAL_EXPORT; |
| MakeSymbol = true; |
| break; |
| case wasm::WASM_EXTERNAL_MEMORY: |
| case wasm::WASM_EXTERNAL_TABLE: |
| break; |
| default: |
| return make_error<GenericBinaryError>( |
| "Unexpected export kind", object_error::parse_failed); |
| } |
| if (MakeSymbol) { |
| auto Pair = SymbolMap.try_emplace(Ex.Name, Symbols.size()); |
| if (Pair.second) { |
| Symbols.emplace_back(Ex.Name, ExportType, |
| Sections.size(), i); |
| DEBUG(dbgs() << "Adding export: " << Symbols.back() |
| << " sym index:" << Symbols.size() << "\n"); |
| } else { |
| uint32_t SymIndex = Pair.first->second; |
| Symbols[SymIndex] = WasmSymbol(Ex.Name, ExportType, Sections.size(), i); |
| DEBUG(dbgs() << "Replacing existing symbol: " << Symbols[SymIndex] |
| << " sym index:" << SymIndex << "\n"); |
| } |
| } |
| Exports.push_back(Ex); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Export section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseStartSection(const uint8_t *Ptr, const uint8_t *End) { |
| StartFunction = readVaruint32(Ptr); |
| if (StartFunction >= FunctionTypes.size()) |
| return make_error<GenericBinaryError>("Invalid start function", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseCodeSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t FunctionCount = readVaruint32(Ptr); |
| if (FunctionCount != FunctionTypes.size()) { |
| return make_error<GenericBinaryError>("Invalid function count", |
| object_error::parse_failed); |
| } |
| |
| CodeSection = ArrayRef<uint8_t>(Ptr, End - Ptr); |
| |
| while (FunctionCount--) { |
| wasm::WasmFunction Function; |
| uint32_t FunctionSize = readVaruint32(Ptr); |
| const uint8_t *FunctionEnd = Ptr + FunctionSize; |
| |
| uint32_t NumLocalDecls = readVaruint32(Ptr); |
| Function.Locals.reserve(NumLocalDecls); |
| while (NumLocalDecls--) { |
| wasm::WasmLocalDecl Decl; |
| Decl.Count = readVaruint32(Ptr); |
| Decl.Type = readVarint7(Ptr); |
| Function.Locals.push_back(Decl); |
| } |
| |
| uint32_t BodySize = FunctionEnd - Ptr; |
| Function.Body = ArrayRef<uint8_t>(Ptr, BodySize); |
| Ptr += BodySize; |
| assert(Ptr == FunctionEnd); |
| Functions.push_back(Function); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Code section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseElemSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| ElemSegments.reserve(Count); |
| while (Count--) { |
| wasm::WasmElemSegment Segment; |
| Segment.TableIndex = readVaruint32(Ptr); |
| if (Segment.TableIndex != 0) { |
| return make_error<GenericBinaryError>("Invalid TableIndex", |
| object_error::parse_failed); |
| } |
| if (Error Err = readInitExpr(Segment.Offset, Ptr)) |
| return Err; |
| uint32_t NumElems = readVaruint32(Ptr); |
| while (NumElems--) { |
| Segment.Functions.push_back(readVaruint32(Ptr)); |
| } |
| ElemSegments.push_back(Segment); |
| } |
| if (Ptr != End) |
| return make_error<GenericBinaryError>("Elem section ended prematurely", |
| object_error::parse_failed); |
| return Error::success(); |
| } |
| |
| Error WasmObjectFile::parseDataSection(const uint8_t *Ptr, const uint8_t *End) { |
| uint32_t Count = readVaruint32(Ptr); |
| DataSegments.reserve(Count); |
| while (Count--) { |
| wasm::WasmDataSegment Segment; |
| Segment.Index = readVaruint32(Ptr); |
| if (Error Err = readInitExpr(Segment.Offset, Ptr)) |
| return Err; |
| uint32_t Size = readVaruint32(Ptr); |
| Segment.Content = ArrayRef<uint8_t>(Ptr, Size); |
| Ptr += Size; |
| DataSegments.push_back(Segment); |
| } |
| if (Ptr != 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().substr(Offset, 1).data()); |
| } |
| |
| 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); |
| |
| DEBUG(dbgs() << "getSymbolFlags: ptr=" << &Sym << " " << Sym << "\n"); |
| if (Sym.Flags & wasm::WASM_SYMBOL_FLAG_WEAK) |
| Result |= SymbolRef::SF_Weak; |
| |
| switch (Sym.Type) { |
| case WasmSymbol::SymbolType::FUNCTION_IMPORT: |
| Result |= SymbolRef::SF_Undefined | SymbolRef::SF_Executable; |
| break; |
| case WasmSymbol::SymbolType::FUNCTION_EXPORT: |
| Result |= SymbolRef::SF_Global | SymbolRef::SF_Executable; |
| break; |
| case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME: |
| Result |= SymbolRef::SF_Executable; |
| Result |= SymbolRef::SF_FormatSpecific; |
| break; |
| case WasmSymbol::SymbolType::GLOBAL_IMPORT: |
| Result |= SymbolRef::SF_Undefined; |
| break; |
| case WasmSymbol::SymbolType::GLOBAL_EXPORT: |
| Result |= SymbolRef::SF_Global; |
| break; |
| } |
| |
| 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).Name; |
| } |
| |
| Expected<uint64_t> WasmObjectFile::getSymbolAddress(DataRefImpl Symb) const { |
| return getSymbolValue(Symb); |
| } |
| |
| uint64_t WasmObjectFile::getSymbolValueImpl(DataRefImpl Symb) const { |
| const WasmSymbol& Sym = getWasmSymbol(Symb); |
| switch (Sym.Type) { |
| case WasmSymbol::SymbolType::FUNCTION_IMPORT: |
| case WasmSymbol::SymbolType::GLOBAL_IMPORT: |
| return 0; |
| case WasmSymbol::SymbolType::FUNCTION_EXPORT: |
| case WasmSymbol::SymbolType::GLOBAL_EXPORT: |
| return Exports[Sym.ElementIndex].Index; |
| case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME: |
| return Sym.ElementIndex; |
| } |
| llvm_unreachable("invalid symbol type"); |
| } |
| |
| 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.Type) { |
| case WasmSymbol::SymbolType::FUNCTION_IMPORT: |
| case WasmSymbol::SymbolType::FUNCTION_EXPORT: |
| case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME: |
| return SymbolRef::ST_Function; |
| case WasmSymbol::SymbolType::GLOBAL_IMPORT: |
| case WasmSymbol::SymbolType::GLOBAL_EXPORT: |
| return SymbolRef::ST_Data; |
| } |
| |
| llvm_unreachable("Unknown WasmSymbol::SymbolType"); |
| return SymbolRef::ST_Other; |
| } |
| |
| Expected<section_iterator> |
| WasmObjectFile::getSymbolSection(DataRefImpl Symb) const { |
| DataRefImpl Ref; |
| Ref.d.a = getWasmSymbol(Symb).Section; |
| 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 Rel) const { |
| llvm_unreachable("not yet implemented"); |
| SymbolRef Ref; |
| return symbol_iterator(Ref); |
| } |
| |
| 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/WebAssembly.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"; } |
| |
| unsigned 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]; |
| } |