diff options
Diffstat (limited to 'contrib/llvm/lib/Object/WasmObjectFile.cpp')
| -rw-r--r-- | contrib/llvm/lib/Object/WasmObjectFile.cpp | 1311 |
1 files changed, 1311 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..4d4c887b2d97 --- /dev/null +++ b/contrib/llvm/lib/Object/WasmObjectFile.cpp @@ -0,0 +1,1311 @@ +//===- 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]; +} |