diff options
Diffstat (limited to 'contrib/llvm/lib/Object/WasmObjectFile.cpp')
| -rw-r--r-- | contrib/llvm/lib/Object/WasmObjectFile.cpp | 1075 |
1 files changed, 1075 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Object/WasmObjectFile.cpp b/contrib/llvm/lib/Object/WasmObjectFile.cpp new file mode 100644 index 000000000000..7a0c05ed8a15 --- /dev/null +++ b/contrib/llvm/lib/Object/WasmObjectFile.cpp @@ -0,0 +1,1075 @@ +//===- 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, const uint8_t *Eof) { + 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); + if (Ptr + Size > Eof) + return make_error<StringError>("Section too large", + 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.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 *Eof = getPtr(getData().size()); + const uint8_t *Ptr = getPtr(4); + + if (Ptr + 4 > Eof) { + Err = make_error<StringError>("Missing version number", + object_error::parse_failed); + return; + } + + Header.Version = readUint32(Ptr); + if (Header.Version != wasm::WasmVersion) { + Err = make_error<StringError>("Bad version number", + object_error::parse_failed); + return; + } + + WasmSection Sec; + while (Ptr < Eof) { + if ((Err = readSection(Sec, Ptr, getPtr(0), Eof))) + 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(); +} + +void WasmObjectFile::populateSymbolTable() { + // Add imports to symbol table + size_t ImportIndex = 0; + size_t GlobalIndex = 0; + size_t FunctionIndex = 0; + for (const wasm::WasmImport& Import : Imports) { + switch (Import.Kind) { + case wasm::WASM_EXTERNAL_GLOBAL: + assert(Import.Global.Type == wasm::WASM_TYPE_I32); + SymbolMap.try_emplace(Import.Field, Symbols.size()); + Symbols.emplace_back(Import.Field, WasmSymbol::SymbolType::GLOBAL_IMPORT, + ImportSection, GlobalIndex++, ImportIndex); + DEBUG(dbgs() << "Adding import: " << Symbols.back() + << " sym index:" << Symbols.size() << "\n"); + break; + case wasm::WASM_EXTERNAL_FUNCTION: + SymbolMap.try_emplace(Import.Field, Symbols.size()); + Symbols.emplace_back(Import.Field, + WasmSymbol::SymbolType::FUNCTION_IMPORT, + ImportSection, FunctionIndex++, ImportIndex); + DEBUG(dbgs() << "Adding import: " << Symbols.back() + << " sym index:" << Symbols.size() << "\n"); + break; + default: + break; + } + ImportIndex++; + } + + // Add exports to symbol table + for (const wasm::WasmExport& Export : Exports) { + if (Export.Kind == wasm::WASM_EXTERNAL_FUNCTION || + Export.Kind == wasm::WASM_EXTERNAL_GLOBAL) { + WasmSymbol::SymbolType ExportType = + Export.Kind == wasm::WASM_EXTERNAL_FUNCTION + ? WasmSymbol::SymbolType::FUNCTION_EXPORT + : WasmSymbol::SymbolType::GLOBAL_EXPORT; + SymbolMap.try_emplace(Export.Name, Symbols.size()); + Symbols.emplace_back(Export.Name, ExportType, + ExportSection, Export.Index); + DEBUG(dbgs() << "Adding export: " << Symbols.back() + << " sym index:" << Symbols.size() << "\n"); + } + } +} + +Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr, + const uint8_t *End) { + HasLinkingSection = true; + + // Only populate the symbol table with imports and exports if the object + // has a linking section (i.e. its a relocatable object file). Otherwise + // the global might not represent symbols at all. + populateSymbolTable(); + + 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 << " expected:" + << Symbol << " flags: " << Flags << "\n"); + } + break; + } + case wasm::WASM_DATA_SIZE: + LinkingData.DataSize = readVaruint32(Ptr); + break; + case wasm::WASM_SEGMENT_INFO: { + uint32_t Count = readVaruint32(Ptr); + 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(Ptr); + DataSegments[i].Data.Alignment = readVaruint32(Ptr); + DataSegments[i].Data.Flags = readVaruint32(Ptr); + } + break; + } + case wasm::WASM_INIT_FUNCS: { + uint32_t Count = readVaruint32(Ptr); + LinkingData.InitFunctions.reserve(Count); + for (uint32_t i = 0; i < Count; i++) { + wasm::WasmInitFunc Init; + Init.Priority = readVaruint32(Ptr); + Init.FunctionIndex = readVaruint32(Ptr); + if (!isValidFunctionIndex(Init.FunctionIndex)) + return make_error<GenericBinaryError>("Invalid function index: " + + Twine(Init.FunctionIndex), + object_error::parse_failed); + LinkingData.InitFunctions.emplace_back(Init); + } + break; + } + 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_MEMORY_ADDR_LEB: + case wasm::R_WEBASSEMBLY_MEMORY_ADDR_SLEB: + case wasm::R_WEBASSEMBLY_MEMORY_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) { + ImportSection = Sections.size(); + 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: + NumImportedFunctions++; + Im.SigIndex = readVaruint32(Ptr); + break; + case wasm::WASM_EXTERNAL_GLOBAL: + NumImportedGlobals++; + Im.Global.Type = readVarint7(Ptr); + Im.Global.Mutable = readVaruint1(Ptr); + 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) { + ExportSection = Sections.size(); + 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); + switch (Ex.Kind) { + case wasm::WASM_EXTERNAL_FUNCTION: + if (Ex.Index >= FunctionTypes.size() + NumImportedFunctions) + return make_error<GenericBinaryError>("Invalid function export", + object_error::parse_failed); + break; + case wasm::WASM_EXTERNAL_GLOBAL: { + if (Ex.Index >= Globals.size() + NumImportedGlobals) + 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 (Ptr != 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 < FunctionTypes.size() + NumImportedFunctions; +} + +Error WasmObjectFile::parseStartSection(const uint8_t *Ptr, const uint8_t *End) { + StartFunction = readVaruint32(Ptr); + if (!isValidFunctionIndex(StartFunction)) + 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) { + const uint8_t *CodeSectionStart = Ptr; + uint32_t FunctionCount = readVaruint32(Ptr); + if (FunctionCount != FunctionTypes.size()) { + return make_error<GenericBinaryError>("Invalid function count", + object_error::parse_failed); + } + + while (FunctionCount--) { + wasm::WasmFunction Function; + const uint8_t *FunctionStart = Ptr; + uint32_t Size = readVaruint32(Ptr); + const uint8_t *FunctionEnd = Ptr + Size; + + Function.CodeSectionOffset = FunctionStart - CodeSectionStart; + Function.Size = FunctionEnd - FunctionStart; + + 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) { + const uint8_t *Start = Ptr; + uint32_t Count = readVaruint32(Ptr); + DataSegments.reserve(Count); + while (Count--) { + WasmSegment Segment; + Segment.Data.MemoryIndex = readVaruint32(Ptr); + if (Error Err = readInitExpr(Segment.Data.Offset, Ptr)) + return Err; + uint32_t Size = readVaruint32(Ptr); + Segment.Data.Content = ArrayRef<uint8_t>(Ptr, Size); + Segment.Data.Alignment = 0; + Segment.Data.Flags = 0; + Segment.SectionOffset = Ptr - Start; + 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.isWeak()) + Result |= SymbolRef::SF_Weak; + if (!Sym.isLocal()) + Result |= SymbolRef::SF_Global; + if (Sym.isHidden()) + Result |= SymbolRef::SF_Hidden; + + switch (Sym.Type) { + case WasmSymbol::SymbolType::FUNCTION_IMPORT: + Result |= SymbolRef::SF_Undefined | SymbolRef::SF_Executable; + break; + case WasmSymbol::SymbolType::FUNCTION_EXPORT: + Result |= 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: + 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::getWasmSymbolValue(const WasmSymbol& Sym) const { + switch (Sym.Type) { + case WasmSymbol::SymbolType::FUNCTION_IMPORT: + case WasmSymbol::SymbolType::GLOBAL_IMPORT: + case WasmSymbol::SymbolType::FUNCTION_EXPORT: + case WasmSymbol::SymbolType::DEBUG_FUNCTION_NAME: + return Sym.ElementIndex; + case WasmSymbol::SymbolType::GLOBAL_EXPORT: { + uint32_t GlobalIndex = Sym.ElementIndex - NumImportedGlobals; + assert(GlobalIndex < Globals.size()); + const wasm::WasmGlobal& Global = Globals[GlobalIndex]; + // WasmSymbols correspond only to I32_CONST globals + assert(Global.InitExpr.Opcode == wasm::WASM_OPCODE_I32_CONST); + return Global.InitExpr.Value.Int32; + } + } + 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.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"; } + +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]; +} |