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WasmObjectFile.cpp
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//===- WasmObjectFile.cpp - Wasm object file implementation ---------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/BinaryFormat/Wasm.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 "llvm/Support/ScopedPrinter.h"
#include "llvm/TargetParser/SubtargetFeature.h"
#include "llvm/TargetParser/Triple.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <cstring>
#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=0x"
<< Twine::utohexstr(Info.Flags) << " [";
switch (getBinding()) {
case wasm::WASM_SYMBOL_BINDING_GLOBAL: Out << "global"; break;
case wasm::WASM_SYMBOL_BINDING_LOCAL: Out << "local"; break;
case wasm::WASM_SYMBOL_BINDING_WEAK: Out << "weak"; break;
}
if (isHidden()) {
Out << ", hidden";
} else {
Out << ", default";
}
Out << "]";
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 = std::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) {
if (Ctx.Ptr + 4 > Ctx.End)
report_fatal_error("EOF while reading float64");
int32_t Result = 0;
memcpy(&Result, Ctx.Ptr, sizeof(Result));
Ctx.Ptr += sizeof(Result);
return Result;
}
static int64_t readFloat64(WasmObjectFile::ReadContext &Ctx) {
if (Ctx.Ptr + 8 > Ctx.End)
report_fatal_error("EOF while reading float64");
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 uint64_t readVaruint64(WasmObjectFile::ReadContext &Ctx) {
return readULEB128(Ctx);
}
static uint8_t readOpcode(WasmObjectFile::ReadContext &Ctx) {
return readUint8(Ctx);
}
static Error readInitExpr(wasm::WasmInitExpr &Expr,
WasmObjectFile::ReadContext &Ctx) {
auto Start = Ctx.Ptr;
Expr.Extended = false;
Expr.Inst.Opcode = readOpcode(Ctx);
switch (Expr.Inst.Opcode) {
case wasm::WASM_OPCODE_I32_CONST:
Expr.Inst.Value.Int32 = readVarint32(Ctx);
break;
case wasm::WASM_OPCODE_I64_CONST:
Expr.Inst.Value.Int64 = readVarint64(Ctx);
break;
case wasm::WASM_OPCODE_F32_CONST:
Expr.Inst.Value.Float32 = readFloat32(Ctx);
break;
case wasm::WASM_OPCODE_F64_CONST:
Expr.Inst.Value.Float64 = readFloat64(Ctx);
break;
case wasm::WASM_OPCODE_GLOBAL_GET:
Expr.Inst.Value.Global = readULEB128(Ctx);
break;
case wasm::WASM_OPCODE_REF_NULL: {
wasm::ValType Ty = static_cast<wasm::ValType>(readULEB128(Ctx));
if (Ty != wasm::ValType::EXTERNREF) {
return make_error<GenericBinaryError>("invalid type for ref.null",
object_error::parse_failed);
}
break;
}
default:
Expr.Extended = true;
}
if (!Expr.Extended) {
uint8_t EndOpcode = readOpcode(Ctx);
if (EndOpcode != wasm::WASM_OPCODE_END)
Expr.Extended = true;
}
if (Expr.Extended) {
Ctx.Ptr = Start;
while (true) {
uint8_t Opcode = readOpcode(Ctx);
switch (Opcode) {
case wasm::WASM_OPCODE_I32_CONST:
case wasm::WASM_OPCODE_GLOBAL_GET:
case wasm::WASM_OPCODE_REF_NULL:
case wasm::WASM_OPCODE_I64_CONST:
case wasm::WASM_OPCODE_F32_CONST:
case wasm::WASM_OPCODE_F64_CONST:
readULEB128(Ctx);
break;
case wasm::WASM_OPCODE_I32_ADD:
case wasm::WASM_OPCODE_I32_SUB:
case wasm::WASM_OPCODE_I32_MUL:
case wasm::WASM_OPCODE_I64_ADD:
case wasm::WASM_OPCODE_I64_SUB:
case wasm::WASM_OPCODE_I64_MUL:
break;
case wasm::WASM_OPCODE_END:
Expr.Body = ArrayRef<uint8_t>(Start, Ctx.Ptr - Start);
return Error::success();
default:
return make_error<GenericBinaryError>(
Twine("invalid opcode in init_expr: ") + Twine(unsigned(Opcode)),
object_error::parse_failed);
}
}
}
return Error::success();
}
static wasm::WasmLimits readLimits(WasmObjectFile::ReadContext &Ctx) {
wasm::WasmLimits Result;
Result.Flags = readVaruint32(Ctx);
Result.Minimum = readVaruint64(Ctx);
if (Result.Flags & wasm::WASM_LIMITS_FLAG_HAS_MAX)
Result.Maximum = readVaruint64(Ctx);
return Result;
}
static wasm::WasmTableType readTableType(WasmObjectFile::ReadContext &Ctx) {
wasm::WasmTableType TableType;
TableType.ElemType = readUint8(Ctx);
TableType.Limits = readLimits(Ctx);
return TableType;
}
static Error readSection(WasmSection &Section, WasmObjectFile::ReadContext &Ctx,
WasmSectionOrderChecker &Checker) {
Section.Type = readUint8(Ctx);
LLVM_DEBUG(dbgs() << "readSection type=" << Section.Type << "\n");
// When reading the section's size, store the size of the LEB used to encode
// it. This allows objcopy/strip to reproduce the binary identically.
const uint8_t *PreSizePtr = Ctx.Ptr;
uint32_t Size = readVaruint32(Ctx);
Section.HeaderSecSizeEncodingLen = Ctx.Ptr - PreSizePtr;
Section.Offset = Ctx.Ptr - Ctx.Start;
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) {
WasmObjectFile::ReadContext SectionCtx;
SectionCtx.Start = Ctx.Ptr;
SectionCtx.Ptr = Ctx.Ptr;
SectionCtx.End = Ctx.Ptr + Size;
Section.Name = readString(SectionCtx);
uint32_t SectionNameSize = SectionCtx.Ptr - SectionCtx.Start;
Ctx.Ptr += SectionNameSize;
Size -= SectionNameSize;
}
if (!Checker.isValidSectionOrder(Section.Type, Section.Name)) {
return make_error<StringError>("out of order section type: " +
llvm::to_string(Section.Type),
object_error::parse_failed);
}
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>("invalid magic number",
object_error::parse_failed);
return;
}
ReadContext Ctx;
Ctx.Start = getData().bytes_begin();
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>("invalid version number: " +
Twine(Header.Version),
object_error::parse_failed);
return;
}
WasmSectionOrderChecker Checker;
while (Ctx.Ptr < Ctx.End) {
WasmSection Sec;
if ((Err = readSection(Sec, Ctx, Checker)))
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_TAG:
return parseTagSection(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);
case wasm::WASM_SEC_DATACOUNT:
return parseDataCountSection(Ctx);
default:
return make_error<GenericBinaryError>(
"invalid section type: " + Twine(Sec.Type), object_error::parse_failed);
}
}
Error WasmObjectFile::parseDylinkSection(ReadContext &Ctx) {
// Legacy "dylink" section support.
// See parseDylink0Section for the current "dylink.0" section parsing.
HasDylinkSection = true;
DylinkInfo.MemorySize = readVaruint32(Ctx);
DylinkInfo.MemoryAlignment = readVaruint32(Ctx);
DylinkInfo.TableSize = readVaruint32(Ctx);
DylinkInfo.TableAlignment = readVaruint32(Ctx);
uint32_t Count = readVaruint32(Ctx);
while (Count--) {
DylinkInfo.Needed.push_back(readString(Ctx));
}
if (Ctx.Ptr != Ctx.End)
return make_error<GenericBinaryError>("dylink section ended prematurely",
object_error::parse_failed);
return Error::success();
}
Error WasmObjectFile::parseDylink0Section(ReadContext &Ctx) {
// See
// https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md
HasDylinkSection = true;
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;
uint32_t Count;
switch (Type) {
case wasm::WASM_DYLINK_MEM_INFO:
DylinkInfo.MemorySize = readVaruint32(Ctx);
DylinkInfo.MemoryAlignment = readVaruint32(Ctx);
DylinkInfo.TableSize = readVaruint32(Ctx);
DylinkInfo.TableAlignment = readVaruint32(Ctx);
break;
case wasm::WASM_DYLINK_NEEDED:
Count = readVaruint32(Ctx);
while (Count--) {
DylinkInfo.Needed.push_back(readString(Ctx));
}
break;
case wasm::WASM_DYLINK_EXPORT_INFO: {
uint32_t Count = readVaruint32(Ctx);
while (Count--) {
DylinkInfo.ExportInfo.push_back({readString(Ctx), readVaruint32(Ctx)});
}
break;
}
case wasm::WASM_DYLINK_IMPORT_INFO: {
uint32_t Count = readVaruint32(Ctx);
while (Count--) {
DylinkInfo.ImportInfo.push_back(
{readString(Ctx), readString(Ctx), readVaruint32(Ctx)});
}
break;
}
default:
LLVM_DEBUG(dbgs() << "unknown dylink.0 sub-section: " << Type << "\n");
Ctx.Ptr += Size;
break;
}
if (Ctx.Ptr != Ctx.End) {
return make_error<GenericBinaryError>(
"dylink.0 sub-section ended prematurely", object_error::parse_failed);
}
}
if (Ctx.Ptr != Ctx.End)
return make_error<GenericBinaryError>("dylink.0 section ended prematurely",
object_error::parse_failed);
return Error::success();
}
Error WasmObjectFile::parseNameSection(ReadContext &Ctx) {
llvm::DenseSet<uint64_t> SeenFunctions;
llvm::DenseSet<uint64_t> SeenGlobals;
llvm::DenseSet<uint64_t> SeenSegments;
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:
case wasm::WASM_NAMES_GLOBAL:
case wasm::WASM_NAMES_DATA_SEGMENT: {
uint32_t Count = readVaruint32(Ctx);
while (Count--) {
uint32_t Index = readVaruint32(Ctx);
StringRef Name = readString(Ctx);
wasm::NameType nameType = wasm::NameType::FUNCTION;
if (Type == wasm::WASM_NAMES_FUNCTION) {
if (!SeenFunctions.insert(Index).second)
return make_error<GenericBinaryError>(
"function named more than once", object_error::parse_failed);
if (!isValidFunctionIndex(Index) || Name.empty())
return make_error<GenericBinaryError>("invalid function name entry",
object_error::parse_failed);
if (isDefinedFunctionIndex(Index))
getDefinedFunction(Index).DebugName = Name;
} else if (Type == wasm::WASM_NAMES_GLOBAL) {
nameType = wasm::NameType::GLOBAL;
if (!SeenGlobals.insert(Index).second)
return make_error<GenericBinaryError>("global named more than once",
object_error::parse_failed);
if (!isValidGlobalIndex(Index) || Name.empty())
return make_error<GenericBinaryError>("invalid global name entry",
object_error::parse_failed);
} else {
nameType = wasm::NameType::DATA_SEGMENT;
if (!SeenSegments.insert(Index).second)
return make_error<GenericBinaryError>(
"segment named more than once", object_error::parse_failed);
if (Index > DataSegments.size())
return make_error<GenericBinaryError>("invalid data segment name entry",
object_error::parse_failed);
}
DebugNames.push_back(wasm::WasmDebugName{nameType, Index, 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;
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.LinkingFlags = 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);
// Clear out any symbol information that was derived from the exports
// section.
LinkingData.SymbolTable.clear();
Symbols.clear();
LinkingData.SymbolTable.reserve(Count);
Symbols.reserve(Count);
StringSet<> SymbolNames;
std::vector<wasm::WasmImport *> ImportedGlobals;
std::vector<wasm::WasmImport *> ImportedFunctions;
std::vector<wasm::WasmImport *> ImportedTags;
std::vector<wasm::WasmImport *> ImportedTables;
ImportedGlobals.reserve(Imports.size());
ImportedFunctions.reserve(Imports.size());
ImportedTags.reserve(Imports.size());
ImportedTables.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);
else if (I.Kind == wasm::WASM_EXTERNAL_TAG)
ImportedTags.emplace_back(&I);
else if (I.Kind == wasm::WASM_EXTERNAL_TABLE)
ImportedTables.emplace_back(&I);
}
while (Count--) {
wasm::WasmSymbolInfo Info;
const wasm::WasmSignature *Signature = nullptr;
const wasm::WasmGlobalType *GlobalType = nullptr;
const wasm::WasmTableType *TableType = 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;
wasm::WasmFunction &Function = Functions[FuncIndex];
Signature = &Signatures[Function.SigIndex];
if (Function.SymbolName.empty())
Function.SymbolName = Info.Name;
} else {
wasm::WasmImport &Import = *ImportedFunctions[Info.ElementIndex];
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) {
Info.Name = readString(Ctx);
Info.ImportName = Import.Field;
} else {
Info.Name = Import.Field;
}
Signature = &Signatures[Import.SigIndex];
Info.ImportModule = 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];
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) {
Info.Name = readString(Ctx);
Info.ImportName = Import.Field;
} else {
Info.Name = Import.Field;
}
GlobalType = &Import.Global;
Info.ImportModule = Import.Module;
}
break;
case wasm::WASM_SYMBOL_TYPE_TABLE:
Info.ElementIndex = readVaruint32(Ctx);
if (!isValidTableNumber(Info.ElementIndex) ||
IsDefined != isDefinedTableNumber(Info.ElementIndex))
return make_error<GenericBinaryError>("invalid table 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 table symbol",
object_error::parse_failed);
if (IsDefined) {
Info.Name = readString(Ctx);
unsigned TableNumber = Info.ElementIndex - NumImportedTables;
wasm::WasmTable &Table = Tables[TableNumber];
TableType = &Table.Type;
if (Table.SymbolName.empty())
Table.SymbolName = Info.Name;
} else {
wasm::WasmImport &Import = *ImportedTables[Info.ElementIndex];
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) {
Info.Name = readString(Ctx);
Info.ImportName = Import.Field;
} else {
Info.Name = Import.Field;
}
TableType = &Import.Table;
Info.ImportModule = Import.Module;
}
break;
case wasm::WASM_SYMBOL_TYPE_DATA:
Info.Name = readString(Ctx);
if (IsDefined) {
auto Index = readVaruint32(Ctx);
auto Offset = readVaruint64(Ctx);
auto Size = readVaruint64(Ctx);
if (!(Info.Flags & wasm::WASM_SYMBOL_ABSOLUTE)) {
if (static_cast<size_t>(Index) >= DataSegments.size())
return make_error<GenericBinaryError>(
"invalid data segment index: " + Twine(Index),
object_error::parse_failed);
size_t SegmentSize = DataSegments[Index].Data.Content.size();
if (Offset > SegmentSize)
return make_error<GenericBinaryError>(
"invalid data symbol offset: `" + Info.Name +
"` (offset: " + Twine(Offset) +
" segment size: " + Twine(SegmentSize) + ")",
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;
}
case wasm::WASM_SYMBOL_TYPE_TAG: {
Info.ElementIndex = readVaruint32(Ctx);
if (!isValidTagIndex(Info.ElementIndex) ||
IsDefined != isDefinedTagIndex(Info.ElementIndex))
return make_error<GenericBinaryError>("invalid tag 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 TagIndex = Info.ElementIndex - NumImportedTags;
wasm::WasmTag &Tag = Tags[TagIndex];
Signature = &Signatures[Tag.SigIndex];
if (Tag.SymbolName.empty())
Tag.SymbolName = Info.Name;
} else {
wasm::WasmImport &Import = *ImportedTags[Info.ElementIndex];
if ((Info.Flags & wasm::WASM_SYMBOL_EXPLICIT_NAME) != 0) {
Info.Name = readString(Ctx);
Info.ImportName = Import.Field;
} else {
Info.Name = Import.Field;
}
Signature = &Signatures[Import.SigIndex];
Info.ImportModule = Import.Module;
}
break;
}
default:
return make_error<GenericBinaryError>("invalid symbol type: " +
Twine(unsigned(Info.Kind)),
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(), GlobalType, TableType,
Signature);
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;
case wasm::WASM_COMDAT_SECTION:
if (Index >= Sections.size())
return make_error<GenericBinaryError>(
"COMDAT section index out of range", object_error::parse_failed);
if (Sections[Index].Type != wasm::WASM_SEC_CUSTOM)
return make_error<GenericBinaryError>(
"non-custom section in a COMDAT", object_error::parse_failed);
Sections[Index].Comdat = ComdatIndex;
break;
}
}
}
return Error::success();
}
Error WasmObjectFile::parseProducersSection(ReadContext &Ctx) {
llvm::SmallSet<StringRef, 3> FieldsSeen;
uint32_t Fields = readVaruint32(Ctx);
for (size_t I = 0; I < Fields; ++I) {
StringRef FieldName = readString(Ctx);
if (!FieldsSeen.insert(FieldName).second)
return make_error<GenericBinaryError>(
"producers section does not have unique fields",
object_error::parse_failed);
std::vector<std::pair<std::string, std::string>> *ProducerVec = nullptr;
if (FieldName == "language") {
ProducerVec = &ProducerInfo.Languages;
} else if (FieldName == "processed-by") {
ProducerVec = &ProducerInfo.Tools;
} else if (FieldName == "sdk") {
ProducerVec = &ProducerInfo.SDKs;
} else {
return make_error<GenericBinaryError>(
"producers section field is not named one of language, processed-by, "
"or sdk",
object_error::parse_failed);
}
uint32_t ValueCount = readVaruint32(Ctx);
llvm::SmallSet<StringRef, 8> ProducersSeen;
for (size_t J = 0; J < ValueCount; ++J) {
StringRef Name = readString(Ctx);
StringRef Version = readString(Ctx);
if (!ProducersSeen.insert(Name).second) {
return make_error<GenericBinaryError>(
"producers section contains repeated producer",
object_error::parse_failed);
}
ProducerVec->emplace_back(std::string(Name), std::string(Version));
}
}
if (Ctx.Ptr != Ctx.End)
return make_error<GenericBinaryError>("producers section ended prematurely",
object_error::parse_failed);
return Error::success();
}
Error WasmObjectFile::parseTargetFeaturesSection(ReadContext &Ctx) {
llvm::SmallSet<std::string, 8> FeaturesSeen;
uint32_t FeatureCount = readVaruint32(Ctx);
for (size_t I = 0; I < FeatureCount; ++I) {
wasm::WasmFeatureEntry Feature;
Feature.Prefix = readUint8(Ctx);
switch (Feature.Prefix) {
case wasm::WASM_FEATURE_PREFIX_USED:
case wasm::WASM_FEATURE_PREFIX_REQUIRED:
case wasm::WASM_FEATURE_PREFIX_DISALLOWED:
break;
default:
return make_error<GenericBinaryError>("unknown feature policy prefix",
object_error::parse_failed);
}
Feature.Name = std::string(readString(Ctx));
if (!FeaturesSeen.insert(Feature.Name).second)
return make_error<GenericBinaryError>(
"target features section contains repeated feature \"" +
Feature.Name + "\"",
object_error::parse_failed);
TargetFeatures.push_back(Feature);
}
if (Ctx.Ptr != Ctx.End)
return make_error<GenericBinaryError>(
"target features section ended prematurely",
object_error::parse_failed);
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();
uint32_t PreviousOffset = 0;
while (RelocCount--) {
wasm::WasmRelocation Reloc = {};
uint32_t type = readVaruint32(Ctx);
Reloc.Type = type;
Reloc.Offset = readVaruint32(Ctx);
if (Reloc.Offset < PreviousOffset)
return make_error<GenericBinaryError>("relocations not in offset order",
object_error::parse_failed);
PreviousOffset = Reloc.Offset;
Reloc.Index = readVaruint32(Ctx);
switch (type) {
case wasm::R_WASM_FUNCTION_INDEX_LEB:
case wasm::R_WASM_FUNCTION_INDEX_I32:
case wasm::R_WASM_TABLE_INDEX_SLEB:
case wasm::R_WASM_TABLE_INDEX_SLEB64:
case wasm::R_WASM_TABLE_INDEX_I32:
case wasm::R_WASM_TABLE_INDEX_I64:
case wasm::R_WASM_TABLE_INDEX_REL_SLEB:
case wasm::R_WASM_TABLE_INDEX_REL_SLEB64:
if (!isValidFunctionSymbol(Reloc.Index))
return make_error<GenericBinaryError>(
"invalid relocation function index", object_error::parse_failed);
break;
case wasm::R_WASM_TABLE_NUMBER_LEB:
if (!isValidTableSymbol(Reloc.Index))
return make_error<GenericBinaryError>("invalid relocation table index",
object_error::parse_failed);
break;
case wasm::R_WASM_TYPE_INDEX_LEB:
if (Reloc.Index >= Signatures.size())
return make_error<GenericBinaryError>("invalid relocation type index",
object_error::parse_failed);
break;
case wasm::R_WASM_GLOBAL_INDEX_LEB:
// R_WASM_GLOBAL_INDEX_LEB are can be used against function and data
// symbols to refer to their GOT entries.
if (!isValidGlobalSymbol(Reloc.Index) &&
!isValidDataSymbol(Reloc.Index) &&
!isValidFunctionSymbol(Reloc.Index))
return make_error<GenericBinaryError>("invalid relocation global index",
object_error::parse_failed);
break;
case wasm::R_WASM_GLOBAL_INDEX_I32:
if (!isValidGlobalSymbol(Reloc.Index))
return make_error<GenericBinaryError>("invalid relocation global index",
object_error::parse_failed);
break;
case wasm::R_WASM_TAG_INDEX_LEB:
if (!isValidTagSymbol(Reloc.Index))
return make_error<GenericBinaryError>("invalid relocation tag index",