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llvm-mirror/tools/llvm-cxxdump/llvm-cxxdump.cpp
Kevin Enderby 9024f597c5 Change llvm-objdump, llvm-nm and llvm-size when reporting an object file error 
when the object is in an archive to use something like libx.a(foo.o) as part of
the error message.

Also changed llvm-objdump and llvm-size to be like llvm-nm and ignore non-object
files in archives and not produce any error message.

To do this Archive::Child::getAsBinary() was changed from ErrorOr<...> to
Expected<...> then that was threaded up to its users.

Converting this interface to Expected<> from ErrorOr<> does involve
touching a number of places. To contain the changes for now the use of
errorToErrorCode() is still used in one place yet to be fully converted.

Again there some were bugs in the existing code that did not deal with the
old ErrorOr<> return values.  So now with Expected<> since they must be
checked and the error handled, I added a TODO and a comments for those.

llvm-svn: 269784
2016-05-17 17:10:12 +00:00

549 lines
21 KiB
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//===- llvm-cxxdump.cpp - Dump C++ data 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 C++ data resident in object files and archives.
//
//===----------------------------------------------------------------------===//
#include "llvm-cxxdump.h"
#include "Error.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Object/SymbolSize.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 "llvm/Support/raw_ostream.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
namespace llvm {
static void error(std::error_code EC) {
if (!EC)
return;
outs() << "\nError reading file: " << EC.message() << ".\n";
outs().flush();
exit(1);
}
} // namespace llvm
static void reportError(StringRef Input, StringRef Message) {
if (Input == "-")
Input = "<stdin>";
errs() << Input << ": " << Message << "\n";
errs().flush();
exit(1);
}
static void reportError(StringRef Input, std::error_code EC) {
reportError(Input, EC.message());
}
static std::map<SectionRef, SmallVector<SectionRef, 1>> SectionRelocMap;
static void 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 : SectionRelocMap[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;
Expected<StringRef> RelocSymName = RelocSymI->getName();
error(errorToErrorCode(RelocSymName.takeError()));
uint64_t Offset = Reloc.getOffset();
if (Offset >= SymOffset && Offset < SymEnd) {
*I = *RelocSymName;
++I;
}
}
}
}
static void 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 : SectionRelocMap[Sec]) {
for (const object::RelocationRef &Reloc : SR.relocations()) {
const object::symbol_iterator RelocSymI = Reloc.getSymbol();
if (RelocSymI == Obj->symbol_end())
continue;
Expected<StringRef> RelocSymName = RelocSymI->getName();
error(errorToErrorCode(RelocSymName.takeError()));
uint64_t Offset = Reloc.getOffset();
if (Offset >= SymOffset && Offset < SymEnd)
Collection[std::make_pair(SymName, Offset - SymOffset)] = *RelocSymName;
}
}
}
static void dumpCXXData(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;
};
struct ThrowInfo {
uint32_t Flags;
};
struct CatchableTypeArray {
uint32_t NumEntries;
};
struct CatchableType {
uint32_t Flags;
uint32_t NonVirtualBaseAdjustmentOffset;
int32_t VirtualBasePointerOffset;
uint32_t VirtualBaseAdjustmentOffset;
uint32_t Size;
StringRef Symbols[2];
};
std::map<std::pair<StringRef, uint64_t>, StringRef> VFTableEntries;
std::map<std::pair<StringRef, uint64_t>, StringRef> TIEntries;
std::map<std::pair<StringRef, uint64_t>, StringRef> CTAEntries;
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<StringRef, ThrowInfo> TIs;
std::map<StringRef, CatchableTypeArray> CTAs;
std::map<StringRef, CatchableType> CTs;
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;
SectionRelocMap.clear();
for (const SectionRef &Section : Obj->sections()) {
section_iterator Sec2 = Section.getRelocatedSection();
if (Sec2 != Obj->section_end())
SectionRelocMap[*Sec2].push_back(Section);
}
uint8_t BytesInAddress = Obj->getBytesInAddress();
std::vector<std::pair<SymbolRef, uint64_t>> SymAddr =
object::computeSymbolSizes(*Obj);
for (auto &P : SymAddr) {
object::SymbolRef Sym = P.first;
uint64_t SymSize = P.second;
Expected<StringRef> SymNameOrErr = Sym.getName();
error(errorToErrorCode(SymNameOrErr.takeError()));
StringRef SymName = *SymNameOrErr;
Expected<object::section_iterator> SecIOrErr = Sym.getSection();
error(errorToErrorCode(SecIOrErr.takeError()));
object::section_iterator SecI = *SecIOrErr;
// 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;
error(Sec.getContents(SecContents));
ErrorOr<uint64_t> SymAddressOrErr = Sym.getAddress();
error(SymAddressOrErr.getError());
uint64_t SymAddress = *SymAddressOrErr;
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 = makeArrayRef(
reinterpret_cast<const little32_t *>(SymContents.data()), 3);
StringRef *I = std::begin(COL.Symbols), *E = std::end(COL.Symbols);
collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
COLs[SymName] = COL;
}
// Class hierarchy descriptors in the MS-ABI start with '??_R3'
else if (SymName.startswith("??_R3")) {
ClassHierarchyDescriptor CHD;
CHD.Data = makeArrayRef(
reinterpret_cast<const little32_t *>(SymContents.data()), 3);
StringRef *I = std::begin(CHD.Symbols), *E = std::end(CHD.Symbols);
collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
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 = makeArrayRef(
reinterpret_cast<const little32_t *>(SymContents.data()) + 1, 5);
StringRef *I = std::begin(BCD.Symbols), *E = std::end(BCD.Symbols);
collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
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);
collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
TDs[SymName] = TD;
}
// Throw descriptors in the MS-ABI start with '_TI'
else if (SymName.startswith("_TI") || SymName.startswith("__TI")) {
ThrowInfo TI;
TI.Flags = *reinterpret_cast<const little32_t *>(SymContents.data());
collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
SymName, TIEntries);
TIs[SymName] = TI;
}
// Catchable type arrays in the MS-ABI start with _CTA or __CTA.
else if (SymName.startswith("_CTA") || SymName.startswith("__CTA")) {
CatchableTypeArray CTA;
CTA.NumEntries =
*reinterpret_cast<const little32_t *>(SymContents.data());
collectRelocationOffsets(Obj, Sec, SecAddress, SymAddress, SymSize,
SymName, CTAEntries);
CTAs[SymName] = CTA;
}
// Catchable types in the MS-ABI start with _CT or __CT.
else if (SymName.startswith("_CT") || SymName.startswith("__CT")) {
const little32_t *DataPtr =
reinterpret_cast<const little32_t *>(SymContents.data());
CatchableType CT;
CT.Flags = DataPtr[0];
CT.NonVirtualBaseAdjustmentOffset = DataPtr[2];
CT.VirtualBasePointerOffset = DataPtr[3];
CT.VirtualBaseAdjustmentOffset = DataPtr[4];
CT.Size = DataPtr[5];
StringRef *I = std::begin(CT.Symbols), *E = std::end(CT.Symbols);
collectRelocatedSymbols(Obj, Sec, SecAddress, SymAddress, SymSize, I, E);
CTs[SymName] = CT;
}
// 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 auto &VFTableEntry : VFTableEntries) {
StringRef VFTableName = VFTableEntry.first.first;
uint64_t Offset = VFTableEntry.first.second;
StringRef SymName = VFTableEntry.second;
outs() << VFTableName << '[' << Offset << "]: " << SymName << '\n';
}
for (const auto &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 auto &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 auto &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 auto &BCAEntry : BCAEntries) {
StringRef BCAName = BCAEntry.first.first;
uint64_t Offset = BCAEntry.first.second;
StringRef SymName = BCAEntry.second;
outs() << BCAName << '[' << Offset << "]: " << SymName << '\n';
}
for (const auto &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 auto &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 auto &TIPair : TIs) {
StringRef TIName = TIPair.first;
const ThrowInfo &TI = TIPair.second;
auto dumpThrowInfoFlag = [&](const char *Name, uint32_t Flag) {
outs() << TIName << "[Flags." << Name
<< "]: " << (TI.Flags & Flag ? "true" : "false") << '\n';
};
auto dumpThrowInfoSymbol = [&](const char *Name, int Offset) {
outs() << TIName << '[' << Name << "]: ";
auto Entry = TIEntries.find(std::make_pair(TIName, Offset));
outs() << (Entry == TIEntries.end() ? "null" : Entry->second) << '\n';
};
outs() << TIName << "[Flags]: " << TI.Flags << '\n';
dumpThrowInfoFlag("Const", 1);
dumpThrowInfoFlag("Volatile", 2);
dumpThrowInfoSymbol("CleanupFn", 4);
dumpThrowInfoSymbol("ForwardCompat", 8);
dumpThrowInfoSymbol("CatchableTypeArray", 12);
}
for (const auto &CTAPair : CTAs) {
StringRef CTAName = CTAPair.first;
const CatchableTypeArray &CTA = CTAPair.second;
outs() << CTAName << "[NumEntries]: " << CTA.NumEntries << '\n';
unsigned Idx = 0;
for (auto I = CTAEntries.lower_bound(std::make_pair(CTAName, 0)),
E = CTAEntries.upper_bound(std::make_pair(CTAName, UINT64_MAX));
I != E; ++I)
outs() << CTAName << '[' << Idx++ << "]: " << I->second << '\n';
}
for (const auto &CTPair : CTs) {
StringRef CTName = CTPair.first;
const CatchableType &CT = CTPair.second;
auto dumpCatchableTypeFlag = [&](const char *Name, uint32_t Flag) {
outs() << CTName << "[Flags." << Name
<< "]: " << (CT.Flags & Flag ? "true" : "false") << '\n';
};
outs() << CTName << "[Flags]: " << CT.Flags << '\n';
dumpCatchableTypeFlag("ScalarType", 1);
dumpCatchableTypeFlag("VirtualInheritance", 4);
outs() << CTName << "[TypeDescriptor]: " << CT.Symbols[0] << '\n';
outs() << CTName << "[NonVirtualBaseAdjustmentOffset]: "
<< CT.NonVirtualBaseAdjustmentOffset << '\n';
outs() << CTName
<< "[VirtualBasePointerOffset]: " << CT.VirtualBasePointerOffset
<< '\n';
outs() << CTName << "[VirtualBaseAdjustmentOffset]: "
<< CT.VirtualBaseAdjustmentOffset << '\n';
outs() << CTName << "[Size]: " << CT.Size << '\n';
outs() << CTName
<< "[CopyCtor]: " << (CT.Symbols[1].empty() ? "null" : CT.Symbols[1])
<< '\n';
}
for (const auto &VTTPair : VTTEntries) {
StringRef VTTName = VTTPair.first.first;
uint64_t VTTOffset = VTTPair.first.second;
StringRef VTTEntry = VTTPair.second;
outs() << VTTName << '[' << VTTOffset << "]: " << VTTEntry << '\n';
}
for (const auto &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 (auto &ErrorOrChild : Arc->children()) {
error(ErrorOrChild.getError());
const Archive::Child &ArcC = *ErrorOrChild;
Expected<std::unique_ptr<Binary>> ChildOrErr = ArcC.getAsBinary();
if (!ChildOrErr) {
// Ignore non-object files.
if (auto E = isNotObjectErrorInvalidFileType(ChildOrErr.takeError())) {
std::string Buf;
raw_string_ostream OS(Buf);
logAllUnhandledErrors(std::move(E), OS, "");
OS.flush();
reportError(Arc->getFileName(), Buf);
}
ChildOrErr.takeError();
continue;
}
if (ObjectFile *Obj = dyn_cast<ObjectFile>(&*ChildOrErr.get()))
dumpCXXData(Obj);
else
reportError(Arc->getFileName(), cxxdump_error::unrecognized_file_format);
}
}
static void dumpInput(StringRef File) {
// Attempt to open the binary.
Expected<OwningBinary<Binary>> BinaryOrErr = createBinary(File);
if (!BinaryOrErr) {
auto EC = errorToErrorCode(BinaryOrErr.takeError());
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))
dumpCXXData(Obj);
else
reportError(File, cxxdump_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 C++ ABI Data 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 EXIT_SUCCESS;
}
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