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llvm-mirror/tools/llvm-vtabledump/llvm-vtabledump.cpp
David Majnemer d818d57e83 llvm-vtabledump: Handle Itanium VTables 
Add support in the vtable dumper for the Itanium ABI.

llvm-svn: 221133
2014-11-03 07:23:25 +00:00

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18 KiB
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//===- llvm-vtabledump.cpp - Dump vtables in an Object File -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Dumps VTables resident in object files and archives. Note, it currently only
// supports MS-ABI style object files.
//
//===----------------------------------------------------------------------===//
#include "llvm-vtabledump.h"
#include "Error.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include <map>
#include <string>
#include <system_error>
using namespace llvm;
using namespace llvm::object;
using namespace llvm::support;
namespace opts {
cl::list<std::string> InputFilenames(cl::Positional,
cl::desc("<input object files>"),
cl::ZeroOrMore);
} // namespace opts
static int ReturnValue = EXIT_SUCCESS;
namespace llvm {
bool error(std::error_code EC) {
if (!EC)
return false;
ReturnValue = EXIT_FAILURE;
outs() << "\nError reading file: " << EC.message() << ".\n";
outs().flush();
return true;
}
} // namespace llvm
static void reportError(StringRef Input, StringRef Message) {
if (Input == "-")
Input = "<stdin>";
errs() << Input << ": " << Message << "\n";
errs().flush();
ReturnValue = EXIT_FAILURE;
}
static void reportError(StringRef Input, std::error_code EC) {
reportError(Input, EC.message());
}
static SmallVectorImpl<SectionRef> &getRelocSections(const ObjectFile *Obj,
const SectionRef &Sec) {
static bool MappingDone = false;
static std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
if (!MappingDone) {
for (const SectionRef &Section : Obj->sections()) {
section_iterator Sec2 = Section.getRelocatedSection();
if (Sec2 != Obj->section_end())
SectionRelocMap[*Sec2].push_back(Section);
}
MappingDone = true;
}
return SectionRelocMap[Sec];
}
static bool collectRelocatedSymbols(const ObjectFile *Obj,
const SectionRef &Sec, uint64_t SecAddress,
uint64_t SymAddress, uint64_t SymSize,
StringRef *I, StringRef *E) {
uint64_t SymOffset = SymAddress - SecAddress;
uint64_t SymEnd = SymOffset + SymSize;
for (const SectionRef &SR : getRelocSections(Obj, Sec)) {
for (const object::RelocationRef &Reloc : SR.relocations()) {
if (I == E)
break;
const object::symbol_iterator RelocSymI = Reloc.getSymbol();
if (RelocSymI == Obj->symbol_end())
continue;
StringRef RelocSymName;
if (error(RelocSymI->getName(RelocSymName)))
return true;
uint64_t Offset;
if (error(Reloc.getOffset(Offset)))
return true;
if (Offset >= SymOffset && Offset < SymEnd) {
*I = RelocSymName;
++I;
}
}
}
return false;
}
static bool collectRelocationOffsets(
const ObjectFile *Obj, const SectionRef &Sec, uint64_t SecAddress,
uint64_t SymAddress, uint64_t SymSize, StringRef SymName,
std::map<std::pair<StringRef, uint64_t>, StringRef> &Collection) {
uint64_t SymOffset = SymAddress - SecAddress;
uint64_t SymEnd = SymOffset + SymSize;
for (const SectionRef &SR : getRelocSections(Obj, Sec)) {
for (const object::RelocationRef &Reloc : SR.relocations()) {
const object::symbol_iterator RelocSymI = Reloc.getSymbol();
if (RelocSymI == Obj->symbol_end())
continue;
StringRef RelocSymName;
if (error(RelocSymI->getName(RelocSymName)))
return true;
uint64_t Offset;
if (error(Reloc.getOffset(Offset)))
return true;
if (Offset >= SymOffset && Offset < SymEnd)
Collection[std::make_pair(SymName, Offset - SymOffset)] = RelocSymName;
}
}
return false;
}
static void dumpVTables(const ObjectFile *Obj) {
struct CompleteObjectLocator {
StringRef Symbols[2];
ArrayRef<little32_t> Data;
};
struct ClassHierarchyDescriptor {
StringRef Symbols[1];
ArrayRef<little32_t> Data;
};
struct BaseClassDescriptor {
StringRef Symbols[2];
ArrayRef<little32_t> Data;
};
struct TypeDescriptor {
StringRef Symbols[1];
uint64_t AlwaysZero;
StringRef MangledName;
};
std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
std::map<StringRef, ArrayRef<little32_t>> VBTables;
std::map<StringRef, CompleteObjectLocator> COLs;
std::map<StringRef, ClassHierarchyDescriptor> CHDs;
std::map<std::pair<StringRef, uint64_t>, StringRef> BCAEntries;
std::map<StringRef, BaseClassDescriptor> BCDs;
std::map<StringRef, TypeDescriptor> TDs;
std::map<std::pair<StringRef, uint64_t>, StringRef> VTableSymEntries;
std::map<std::pair<StringRef, uint64_t>, int64_t> VTableDataEntries;
std::map<std::pair<StringRef, uint64_t>, StringRef> VTTEntries;
std::map<StringRef, StringRef> TINames;
uint8_t BytesInAddress = Obj->getBytesInAddress();
for (const object::SymbolRef &Sym : Obj->symbols()) {
StringRef SymName;
if (error(Sym.getName(SymName)))
return;
object::section_iterator SecI(Obj->section_begin());
if (error(Sym.getSection(SecI)))
return;
// Skip external symbols.
if (SecI == Obj->section_end())
continue;
const SectionRef &Sec = *SecI;
// Skip virtual or BSS sections.
if (Sec.isBSS() || Sec.isVirtual())
continue;
StringRef SecContents;
if (error(Sec.getContents(SecContents)))
return;
uint64_t SymAddress, SymSize;
if (error(Sym.getAddress(SymAddress)) || error(Sym.getSize(SymSize)))
return;
uint64_t SecAddress = Sec.getAddress();
uint64_t SecSize = Sec.getSize();
uint64_t SymOffset = SymAddress - SecAddress;
StringRef SymContents = SecContents.substr(SymOffset, SymSize);
// VFTables in the MS-ABI start with '??_7' and are contained within their
// own COMDAT section. We then determine the contents of the VFTable by
// looking at each relocation in the section.
if (SymName.startswith("??_7")) {
// Each relocation either names a virtual method or a thunk. We note the
// offset into the section and the symbol used for the relocation.
collectRelocationOffsets(Obj, Sec, SecAddress, SecAddress, SecSize,
SymName, VFTableEntries);
}
// VBTables in the MS-ABI start with '??_8' and are filled with 32-bit
// offsets of virtual bases.
else if (SymName.startswith("??_8")) {
ArrayRef<little32_t> VBTableData(
reinterpret_cast<const little32_t *>(SymContents.data()),
SymContents.size() / sizeof(little32_t));
VBTables[SymName] = VBTableData;
}
// Complete object locators in the MS-ABI start with '??_R4'
else if (SymName.startswith("??_R4")) {
CompleteObjectLocator COL;
COL.Data = ArrayRef<little32_t>(
reinterpret_cast<const little32_t *>(SymContents.data()), 3);
StringRef *I = std::begin(COL.Symbols), *E = std::end(COL.Symbols);
if (collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I,
E))
return;
COLs[SymName] = COL;
}
// Class hierarchy descriptors in the MS-ABI start with '??_R3'
else if (SymName.startswith("??_R3")) {
ClassHierarchyDescriptor CHD;
CHD.Data = ArrayRef<little32_t>(
reinterpret_cast<const little32_t *>(SymContents.data()), 3);
StringRef *I = std::begin(CHD.Symbols), *E = std::end(CHD.Symbols);
if (collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I,
E))
return;
CHDs[SymName] = CHD;
}
// Class hierarchy descriptors in the MS-ABI start with '??_R2'
else if (SymName.startswith("??_R2")) {
// Each relocation names a base class descriptor. We note the offset into
// the section and the symbol used for the relocation.
collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
SymName, BCAEntries);
}
// Base class descriptors in the MS-ABI start with '??_R1'
else if (SymName.startswith("??_R1")) {
BaseClassDescriptor BCD;
BCD.Data = ArrayRef<little32_t>(
reinterpret_cast<const little32_t *>(SymContents.data()) + 1, 5);
StringRef *I = std::begin(BCD.Symbols), *E = std::end(BCD.Symbols);
if (collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I,
E))
return;
BCDs[SymName] = BCD;
}
// Type descriptors in the MS-ABI start with '??_R0'
else if (SymName.startswith("??_R0")) {
const char *DataPtr = SymContents.drop_front(BytesInAddress).data();
TypeDescriptor TD;
if (BytesInAddress == 8)
TD.AlwaysZero = *reinterpret_cast<const little64_t *>(DataPtr);
else
TD.AlwaysZero = *reinterpret_cast<const little32_t *>(DataPtr);
TD.MangledName = SymContents.drop_front(BytesInAddress * 2);
StringRef *I = std::begin(TD.Symbols), *E = std::end(TD.Symbols);
if (collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I,
E))
return;
TDs[SymName] = TD;
}
// Construction vtables in the Itanium ABI start with '_ZTT' or '__ZTT'.
else if (SymName.startswith("_ZTT") || SymName.startswith("__ZTT")) {
collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
SymName, VTTEntries);
}
// Typeinfo names in the Itanium ABI start with '_ZTS' or '__ZTS'.
else if (SymName.startswith("_ZTS") || SymName.startswith("__ZTS")) {
TINames[SymName] = SymContents.slice(0, SymContents.find('\0'));
}
// Vtables in the Itanium ABI start with '_ZTV' or '__ZTV'.
else if (SymName.startswith("_ZTV") || SymName.startswith("__ZTV")) {
collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
SymName, VTableSymEntries);
for (uint64_t SymOffI = 0; SymOffI < SymSize; SymOffI += BytesInAddress) {
auto Key = std::make_pair(SymName, SymOffI);
if (VTableSymEntries.count(Key))
continue;
const char *DataPtr = SymContents.substr(SymOffI, BytesInAddress).data();
int64_t VData;
if (BytesInAddress == 8)
VData = *reinterpret_cast<const little64_t *>(DataPtr);
else
VData = *reinterpret_cast<const little32_t *>(DataPtr);
VTableDataEntries[Key] = VData;
}
}
// Typeinfo structures in the Itanium ABI start with '_ZTI' or '__ZTI'.
else if (SymName.startswith("_ZTI") || SymName.startswith("__ZTI")) {
// FIXME: Do something with these!
}
}
for (const std::pair<std::pair<StringRef, uint64_t>, StringRef> &VFTableEntry :
VFTableEntries) {
StringRef VFTableName = VFTableEntry.first.first;
uint64_t Offset = VFTableEntry.first.second;
StringRef SymName = VFTableEntry.second;
outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
}
for (const std::pair<StringRef, ArrayRef<little32_t>> &VBTable : VBTables) {
StringRef VBTableName = VBTable.first;
uint32_t Idx = 0;
for (little32_t Offset : VBTable.second) {
outs() << VBTableName << '[' << Idx << "]: " << Offset << '\n';
Idx += sizeof(Offset);
}
}
for (const std::pair<StringRef, CompleteObjectLocator> &COLPair : COLs) {
StringRef COLName = COLPair.first;
const CompleteObjectLocator &COL = COLPair.second;
outs() << COLName << "[IsImageRelative]: " << COL.Data[0] << '\n';
outs() << COLName << "[OffsetToTop]: " << COL.Data[1] << '\n';
outs() << COLName << "[VFPtrOffset]: " << COL.Data[2] << '\n';
outs() << COLName << "[TypeDescriptor]: " << COL.Symbols[0] << '\n';
outs() << COLName << "[ClassHierarchyDescriptor]: " << COL.Symbols[1] << '\n';
}
for (const std::pair<StringRef, ClassHierarchyDescriptor> &CHDPair : CHDs) {
StringRef CHDName = CHDPair.first;
const ClassHierarchyDescriptor &CHD = CHDPair.second;
outs() << CHDName << "[AlwaysZero]: " << CHD.Data[0] << '\n';
outs() << CHDName << "[Flags]: " << CHD.Data[1] << '\n';
outs() << CHDName << "[NumClasses]: " << CHD.Data[2] << '\n';
outs() << CHDName << "[BaseClassArray]: " << CHD.Symbols[0] << '\n';
}
for (const std::pair<std::pair<StringRef, uint64_t>, StringRef> &BCAEntry :
BCAEntries) {
StringRef BCAName = BCAEntry.first.first;
uint64_t Offset = BCAEntry.first.second;
StringRef SymName = BCAEntry.second;
outs() << BCAName << '[' << Offset << "]: " << SymName << '\n';
}
for (const std::pair<StringRef, BaseClassDescriptor> &BCDPair : BCDs) {
StringRef BCDName = BCDPair.first;
const BaseClassDescriptor &BCD = BCDPair.second;
outs() << BCDName << "[TypeDescriptor]: " << BCD.Symbols[0] << '\n';
outs() << BCDName << "[NumBases]: " << BCD.Data[0] << '\n';
outs() << BCDName << "[OffsetInVBase]: " << BCD.Data[1] << '\n';
outs() << BCDName << "[VBPtrOffset]: " << BCD.Data[2] << '\n';
outs() << BCDName << "[OffsetInVBTable]: " << BCD.Data[3] << '\n';
outs() << BCDName << "[Flags]: " << BCD.Data[4] << '\n';
outs() << BCDName << "[ClassHierarchyDescriptor]: " << BCD.Symbols[1] << '\n';
}
for (const std::pair<StringRef, TypeDescriptor> &TDPair : TDs) {
StringRef TDName = TDPair.first;
const TypeDescriptor &TD = TDPair.second;
outs() << TDName << "[VFPtr]: " << TD.Symbols[0] << '\n';
outs() << TDName << "[AlwaysZero]: " << TD.AlwaysZero << '\n';
outs() << TDName << "[MangledName]: ";
outs().write_escaped(TD.MangledName.rtrim(StringRef("\0", 1)),
/*UseHexEscapes=*/true)
<< '\n';
}
for (const std::pair<std::pair<StringRef, uint64_t>, StringRef> &VTTPair :
VTTEntries) {
StringRef VTTName = VTTPair.first.first;
uint64_t VTTOffset = VTTPair.first.second;
StringRef VTTEntry = VTTPair.second;
outs() << VTTName << '[' << VTTOffset << "]: " << VTTEntry << '\n';
}
for (const std::pair<StringRef, StringRef> &TIPair : TINames) {
StringRef TIName = TIPair.first;
outs() << TIName << ": " << TIPair.second << '\n';
}
auto VTableSymI = VTableSymEntries.begin();
auto VTableSymE = VTableSymEntries.end();
auto VTableDataI = VTableDataEntries.begin();
auto VTableDataE = VTableDataEntries.end();
for (;;) {
bool SymDone = VTableSymI == VTableSymE;
bool DataDone = VTableDataI == VTableDataE;
if (SymDone && DataDone)
break;
if (!SymDone && (DataDone || VTableSymI->first < VTableDataI->first)) {
StringRef VTableName = VTableSymI->first.first;
uint64_t Offset = VTableSymI->first.second;
StringRef VTableEntry = VTableSymI->second;
outs() << VTableName << '[' << Offset << "]: ";
outs() << VTableEntry;
outs() << '\n';
++VTableSymI;
continue;
}
if (!DataDone && (SymDone || VTableDataI->first < VTableSymI->first)) {
StringRef VTableName = VTableDataI->first.first;
uint64_t Offset = VTableDataI->first.second;
int64_t VTableEntry = VTableDataI->second;
outs() << VTableName << '[' << Offset << "]: ";
outs() << VTableEntry;
outs() << '\n';
++VTableDataI;
continue;
}
}
}
static void dumpArchive(const Archive *Arc) {
for (const Archive::Child &ArcC : Arc->children()) {
ErrorOr<std::unique_ptr<Binary>> ChildOrErr = ArcC.getAsBinary();
if (std::error_code EC = ChildOrErr.getError()) {
// Ignore non-object files.
if (EC != object_error::invalid_file_type)
reportError(Arc->getFileName(), EC.message());
continue;
}
if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
dumpVTables(Obj);
else
reportError(Arc->getFileName(),
vtabledump_error::unrecognized_file_format);
}
}
static void dumpInput(StringRef File) {
// If file isn't stdin, check that it exists.
if (File != "-" && !sys::fs::exists(File)) {
reportError(File, vtabledump_error::file_not_found);
return;
}
// Attempt to open the binary.
ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
if (std::error_code EC = BinaryOrErr.getError()) {
reportError(File, EC);
return;
}
Binary &Binary = *BinaryOrErr.get().getBinary();
if (Archive *Arc = dyn_cast<Archive>(&Binary))
dumpArchive(Arc);
else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
dumpVTables(Obj);
else
reportError(File, vtabledump_error::unrecognized_file_format);
}
int main(int argc, const char *argv[]) {
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y;
// Initialize targets.
llvm::InitializeAllTargetInfos();
// Register the target printer for --version.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
cl::ParseCommandLineOptions(argc, argv, "LLVM VTable Dumper\n");
// Default to stdin if no filename is specified.
if (opts::InputFilenames.size() == 0)
opts::InputFilenames.push_back("-");
std::for_each(opts::InputFilenames.begin(), opts::InputFilenames.end(),
dumpInput);
return ReturnValue;
}
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