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7d5e8c19c6
llvm-mirror/lib/Object/WasmObjectFile.cpp
JF Bastien 7d5e8c19c6 [NFC] WebAssembly build fix 
Summary:
r332305 added a use of llvm::wasm::toString in llvm::object::WasmSymbol::print,
which is in a header file. It also moves toString to BinaryFormat. This has the
unintended side-effect that any inclusion of Object/Wasm.h now relies on
toString, and needs to required_libraries = BinaryFormat. Thankfully most builds
don't fail with this because print just isn't used and gets eliminated, dropping
the required dependency in the process. Not all builds are so lucky.

Fix this issue by moving print to the corresponding .cpp file.

<rdar://problem/40258137>

Reviewers: sbc100, ncw, paquette

Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D46977

llvm-svn: 332530
2018-05-16 21:24:03 +00:00

1285 lines
44 KiB
C++
Raw Blame History

//===- 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;
}
}
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 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 = readUint8(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 = readUint8(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);
if (Section.Type == wasm::WASM_SEC_CUSTOM) {
const uint8_t *NameStart = Ptr;
Section.Name = readString(Ptr);
Size -= Ptr - NameStart;
}
Section.Content = ArrayRef<uint8_t>(Ptr, Size);
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;
}
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) {
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 (Ptr < End) {
uint8_t Type = readUint8(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);
if (!Seen.insert(Index).second)
return make_error<GenericBinaryError>("Function named more than once",
object_error::parse_failed);
StringRef Name = readString(Ptr);
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:
Ptr += Size;
break;
}
if (Ptr != SubSectionEnd)
return make_error<GenericBinaryError>("Name sub-section ended prematurely",
object_error::parse_failed);
}
if (Ptr != End)
return make_error<GenericBinaryError>("Name section ended prematurely",
object_error::parse_failed);
return Error::success();
}
Error WasmObjectFile::parseLinkingSection(const uint8_t *Ptr,
const uint8_t *End) {
HasLinkingSection = true;
if (Functions.size() != FunctionTypes.size()) {
return make_error<GenericBinaryError>(
"Linking data must come after code section", object_error::parse_failed);
}
LinkingData.Version = readVaruint32(Ptr);
if (LinkingData.Version != wasm::WasmMetadataVersion) {
return make_error<GenericBinaryError>(
"Unexpected metadata version: " + Twine(LinkingData.Version) +
" (Expected: " + Twine(wasm::WasmMetadataVersion) + ")",
object_error::parse_failed);
}
while (Ptr < End) {
uint8_t Type = readUint8(Ptr);
uint32_t Size = readVaruint32(Ptr);
const uint8_t *SubSectionEnd = Ptr + Size;
switch (Type) {
case wasm::WASM_SYMBOL_TABLE:
if (Error Err = parseLinkingSectionSymtab(Ptr, SubSectionEnd))
return Err;
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.Symbol = readVaruint32(Ptr);
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(Ptr, SubSectionEnd))
return Err;
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();
}
Error WasmObjectFile::parseLinkingSectionSymtab(const uint8_t *&Ptr,
const uint8_t *End) {
uint32_t Count = readVaruint32(Ptr);
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(Ptr);
Info.Flags = readVaruint32(Ptr);
bool IsDefined = (Info.Flags & wasm::WASM_SYMBOL_UNDEFINED) == 0;
switch (Info.Kind) {
case wasm::WASM_SYMBOL_TYPE_FUNCTION:
Info.ElementIndex = readVaruint32(Ptr);
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(Ptr);
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(Ptr);
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(Ptr);
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(Ptr);
if (IsDefined) {
uint32_t Index = readVaruint32(Ptr);
if (Index >= DataSegments.size())
return make_error<GenericBinaryError>("invalid data symbol index",
object_error::parse_failed);
uint32_t Offset = readVaruint32(Ptr);
uint32_t Size = readVaruint32(Ptr);
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(Ptr);
// 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(const uint8_t *&Ptr,
const uint8_t *End)
{
uint32_t ComdatCount = readVaruint32(Ptr);
StringSet<> ComdatSet;
for (unsigned ComdatIndex = 0; ComdatIndex < ComdatCount; ++ComdatIndex) {
StringRef Name = readString(Ptr);
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(Ptr);
if (Flags != 0)
return make_error<GenericBinaryError>("Unsupported COMDAT flags",
object_error::parse_failed);
uint32_t EntryCount = readVaruint32(Ptr);
while (EntryCount--) {
unsigned Kind = readVaruint32(Ptr);
unsigned Index = readVaruint32(Ptr);
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, const uint8_t *Ptr,
const uint8_t *End) {
uint32_t SectionIndex = readVaruint32(Ptr);
if (SectionIndex >= Sections.size())
return make_error<GenericBinaryError>("Invalid section index",
object_error::parse_failed);
WasmSection& Section = Sections[SectionIndex];
uint32_t RelocCount = readVaruint32(Ptr);
uint32_t EndOffset = Section.Content.size();
while (RelocCount--) {
wasm::WasmRelocation 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:
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(Ptr);
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(Ptr);
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(Ptr);
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 (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) {
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;
uint8_t Form = readUint8(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 = readUint8(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 = readUint8(Ptr);
}
Signatures.push_back(Sig);
}
if (Ptr != End)
return make_error<GenericBinaryError>("Type section ended prematurely",
object_error::parse_failed);
return Error::success();
}
Error WasmObjectFile::parseImportSection(const uint8_t *Ptr, const uint8_t *End) {
uint32_t Count = readVaruint32(Ptr);
Imports.reserve(Count);
for (uint32_t i = 0; i < Count; i++) {
wasm::WasmImport Im;
Im.Module = readString(Ptr);
Im.Field = readString(Ptr);
Im.Kind = readUint8(Ptr);
switch (Im.Kind) {
case wasm::WASM_EXTERNAL_FUNCTION:
NumImportedFunctions++;
Im.SigIndex = readVaruint32(Ptr);
break;
case wasm::WASM_EXTERNAL_GLOBAL:
NumImportedGlobals++;
Im.Global.Type = readUint8(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);
uint32_t NumTypes = Signatures.size();
while (Count--) {
uint32_t Type = readVaruint32(Ptr);
if (Type >= NumTypes)
return make_error<GenericBinaryError>("Invalid function type",
object_error::parse_failed);
FunctionTypes.push_back(Type);
}
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) {
GlobalSection = Sections.size();
uint32_t Count = readVaruint32(Ptr);
Globals.reserve(Count);
while (Count--) {
wasm::WasmGlobal Global;
Global.Index = NumImportedGlobals + Globals.size();
Global.Type.Type = readUint8(Ptr);
Global.Type.Mutable = readVaruint1(Ptr);
if (Error Err = readInitExpr(Global.InitExpr, Ptr))
return Err;
Globals.push_back(Global);
}
if (Ptr != End)
return make_error<GenericBinaryError>("Global section ended prematurely",
object_error::parse_failed);
return Error::success();
}
Error WasmObjectFile::parseExportSection(const uint8_t *Ptr, const uint8_t *End) {
uint32_t Count = readVaruint32(Ptr);
Exports.reserve(Count);
for (uint32_t i = 0; i < Count; i++) {
wasm::WasmExport Ex;
Ex.Name = readString(Ptr);
Ex.Kind = readUint8(Ptr);
Ex.Index = readVaruint32(Ptr);
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 (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 < 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(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) {
CodeSection = Sections.size();
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.CodeOffset = Ptr - FunctionStart;
Function.Index = NumImportedFunctions + Functions.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 = readUint8(Ptr);
Function.Locals.push_back(Decl);
}
uint32_t BodySize = FunctionEnd - Ptr;
Function.Body = ArrayRef<uint8_t>(Ptr, BodySize);
// This will be set later when reading in the linking metadata section.
Function.Comdat = UINT32_MAX;
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) {
DataSection = Sections.size();
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);
// 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 = 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);
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];
}
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