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llvm-mirror/tools/llvm-objdump/llvm-objdump.cpp
Rafael Espindola f95d54b477 Add r170095 back. 
I cannot reproduce it the failures locally, so I will keep an eye at the ppc
bots. This patch does add the change to the "Disassembly of section" message,
but that is not what was failing on the bots.

Original message:

Add a funciton to get the segment name of a section.

On MachO, sections also have segment names. When a tool looking at a .o file
prints a segment name, this is what they mean. In reality, a .o has only one
anonymous, segment.

This patch adds a MachO only function to fetch that segment name. I named it
getSectionFinalSegmentName since the main use for the name seems to be infor
the linker with segment this section should go to.

The patch also changes MachOObjectFile::getSectionName to return just the
section name instead of computing SegmentName,SectionName.

llvm-svn: 170545
2012-12-19 14:15:04 +00:00

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//===-- llvm-objdump.cpp - Object file dumping utility for llvm -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like binutils "objdump", that is, it
// dumps out a plethora of information about an object file depending on the
// flags.
//
//===----------------------------------------------------------------------===//
#include "llvm-objdump.h"
#include "MCFunction.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/MemoryObject.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <cctype>
#include <cstring>
using namespace llvm;
using namespace object;
static cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input object files>"),cl::ZeroOrMore);
static cl::opt<bool>
Disassemble("disassemble",
cl::desc("Display assembler mnemonics for the machine instructions"));
static cl::alias
Disassembled("d", cl::desc("Alias for --disassemble"),
cl::aliasopt(Disassemble));
static cl::opt<bool>
Relocations("r", cl::desc("Display the relocation entries in the file"));
static cl::opt<bool>
SectionContents("s", cl::desc("Display the content of each section"));
static cl::opt<bool>
SymbolTable("t", cl::desc("Display the symbol table"));
static cl::opt<bool>
MachOOpt("macho", cl::desc("Use MachO specific object file parser"));
static cl::alias
MachOm("m", cl::desc("Alias for --macho"), cl::aliasopt(MachOOpt));
cl::opt<std::string>
llvm::TripleName("triple", cl::desc("Target triple to disassemble for, "
"see -version for available targets"));
cl::opt<std::string>
llvm::ArchName("arch", cl::desc("Target arch to disassemble for, "
"see -version for available targets"));
static cl::opt<bool>
SectionHeaders("section-headers", cl::desc("Display summaries of the headers "
"for each section."));
static cl::alias
SectionHeadersShort("headers", cl::desc("Alias for --section-headers"),
cl::aliasopt(SectionHeaders));
static cl::alias
SectionHeadersShorter("h", cl::desc("Alias for --section-headers"),
cl::aliasopt(SectionHeaders));
static cl::list<std::string>
MAttrs("mattr",
cl::CommaSeparated,
cl::desc("Target specific attributes"),
cl::value_desc("a1,+a2,-a3,..."));
static cl::opt<bool>
NoShowRawInsn("no-show-raw-insn", cl::desc("When disassembling instructions, "
"do not print the instruction bytes."));
static cl::opt<bool>
UnwindInfo("unwind-info", cl::desc("Display unwind information"));
static cl::alias
UnwindInfoShort("u", cl::desc("Alias for --unwind-info"),
cl::aliasopt(UnwindInfo));
static StringRef ToolName;
bool llvm::error(error_code ec) {
if (!ec) return false;
outs() << ToolName << ": error reading file: " << ec.message() << ".\n";
outs().flush();
return true;
}
static const Target *getTarget(const ObjectFile *Obj = NULL) {
// Figure out the target triple.
llvm::Triple TheTriple("unknown-unknown-unknown");
if (TripleName.empty()) {
if (Obj)
TheTriple.setArch(Triple::ArchType(Obj->getArch()));
} else
TheTriple.setTriple(Triple::normalize(TripleName));
// Get the target specific parser.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
Error);
if (!TheTarget) {
errs() << ToolName << ": " << Error;
return 0;
}
// Update the triple name and return the found target.
TripleName = TheTriple.getTriple();
return TheTarget;
}
void llvm::StringRefMemoryObject::anchor() { }
void llvm::DumpBytes(StringRef bytes) {
static const char hex_rep[] = "0123456789abcdef";
// FIXME: The real way to do this is to figure out the longest instruction
// and align to that size before printing. I'll fix this when I get
// around to outputting relocations.
// 15 is the longest x86 instruction
// 3 is for the hex rep of a byte + a space.
// 1 is for the null terminator.
enum { OutputSize = (15 * 3) + 1 };
char output[OutputSize];
assert(bytes.size() <= 15
&& "DumpBytes only supports instructions of up to 15 bytes");
memset(output, ' ', sizeof(output));
unsigned index = 0;
for (StringRef::iterator i = bytes.begin(),
e = bytes.end(); i != e; ++i) {
output[index] = hex_rep[(*i & 0xF0) >> 4];
output[index + 1] = hex_rep[*i & 0xF];
index += 3;
}
output[sizeof(output) - 1] = 0;
outs() << output;
}
bool llvm::RelocAddressLess(RelocationRef a, RelocationRef b) {
uint64_t a_addr, b_addr;
if (error(a.getAddress(a_addr))) return false;
if (error(b.getAddress(b_addr))) return false;
return a_addr < b_addr;
}
static void DisassembleObject(const ObjectFile *Obj, bool InlineRelocs) {
const Target *TheTarget = getTarget(Obj);
// getTarget() will have already issued a diagnostic if necessary, so
// just bail here if it failed.
if (!TheTarget)
return;
// Package up features to be passed to target/subtarget
std::string FeaturesStr;
if (MAttrs.size()) {
SubtargetFeatures Features;
for (unsigned i = 0; i != MAttrs.size(); ++i)
Features.AddFeature(MAttrs[i]);
FeaturesStr = Features.getString();
}
error_code ec;
for (section_iterator i = Obj->begin_sections(),
e = Obj->end_sections();
i != e; i.increment(ec)) {
if (error(ec)) break;
bool text;
if (error(i->isText(text))) break;
if (!text) continue;
uint64_t SectionAddr;
if (error(i->getAddress(SectionAddr))) break;
// Make a list of all the symbols in this section.
std::vector<std::pair<uint64_t, StringRef> > Symbols;
for (symbol_iterator si = Obj->begin_symbols(),
se = Obj->end_symbols();
si != se; si.increment(ec)) {
bool contains;
if (!error(i->containsSymbol(*si, contains)) && contains) {
uint64_t Address;
if (error(si->getAddress(Address))) break;
Address -= SectionAddr;
StringRef Name;
if (error(si->getName(Name))) break;
Symbols.push_back(std::make_pair(Address, Name));
}
}
// Sort the symbols by address, just in case they didn't come in that way.
array_pod_sort(Symbols.begin(), Symbols.end());
// Make a list of all the relocations for this section.
std::vector<RelocationRef> Rels;
if (InlineRelocs) {
for (relocation_iterator ri = i->begin_relocations(),
re = i->end_relocations();
ri != re; ri.increment(ec)) {
if (error(ec)) break;
Rels.push_back(*ri);
}
}
// Sort relocations by address.
std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
StringRef SegmentName = "";
if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(Obj)) {
DataRefImpl DR = i->getRawDataRefImpl();
if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
break;
}
StringRef name;
if (error(i->getName(name))) break;
outs() << "Disassembly of section ";
if (!SegmentName.empty())
outs() << SegmentName << ",";
outs() << name << ':';
// If the section has no symbols just insert a dummy one and disassemble
// the whole section.
if (Symbols.empty())
Symbols.push_back(std::make_pair(0, name));
// Set up disassembler.
OwningPtr<const MCAsmInfo> AsmInfo(TheTarget->createMCAsmInfo(TripleName));
if (!AsmInfo) {
errs() << "error: no assembly info for target " << TripleName << "\n";
return;
}
OwningPtr<const MCSubtargetInfo> STI(
TheTarget->createMCSubtargetInfo(TripleName, "", FeaturesStr));
if (!STI) {
errs() << "error: no subtarget info for target " << TripleName << "\n";
return;
}
OwningPtr<const MCDisassembler> DisAsm(
TheTarget->createMCDisassembler(*STI));
if (!DisAsm) {
errs() << "error: no disassembler for target " << TripleName << "\n";
return;
}
OwningPtr<const MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
if (!MRI) {
errs() << "error: no register info for target " << TripleName << "\n";
return;
}
OwningPtr<const MCInstrInfo> MII(TheTarget->createMCInstrInfo());
if (!MII) {
errs() << "error: no instruction info for target " << TripleName << "\n";
return;
}
int AsmPrinterVariant = AsmInfo->getAssemblerDialect();
OwningPtr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
AsmPrinterVariant, *AsmInfo, *MII, *MRI, *STI));
if (!IP) {
errs() << "error: no instruction printer for target " << TripleName
<< '\n';
return;
}
StringRef Bytes;
if (error(i->getContents(Bytes))) break;
StringRefMemoryObject memoryObject(Bytes);
uint64_t Size;
uint64_t Index;
uint64_t SectSize;
if (error(i->getSize(SectSize))) break;
std::vector<RelocationRef>::const_iterator rel_cur = Rels.begin();
std::vector<RelocationRef>::const_iterator rel_end = Rels.end();
// Disassemble symbol by symbol.
for (unsigned si = 0, se = Symbols.size(); si != se; ++si) {
uint64_t Start = Symbols[si].first;
uint64_t End;
// The end is either the size of the section or the beginning of the next
// symbol.
if (si == se - 1)
End = SectSize;
// Make sure this symbol takes up space.
else if (Symbols[si + 1].first != Start)
End = Symbols[si + 1].first - 1;
else
// This symbol has the same address as the next symbol. Skip it.
continue;
outs() << '\n' << Symbols[si].second << ":\n";
#ifndef NDEBUG
raw_ostream &DebugOut = DebugFlag ? dbgs() : nulls();
#else
raw_ostream &DebugOut = nulls();
#endif
for (Index = Start; Index < End; Index += Size) {
MCInst Inst;
if (DisAsm->getInstruction(Inst, Size, memoryObject, Index,
DebugOut, nulls())) {
outs() << format("%8" PRIx64 ":", SectionAddr + Index);
if (!NoShowRawInsn) {
outs() << "\t";
DumpBytes(StringRef(Bytes.data() + Index, Size));
}
IP->printInst(&Inst, outs(), "");
outs() << "\n";
} else {
errs() << ToolName << ": warning: invalid instruction encoding\n";
if (Size == 0)
Size = 1; // skip illegible bytes
}
// Print relocation for instruction.
while (rel_cur != rel_end) {
bool hidden = false;
uint64_t addr;
SmallString<16> name;
SmallString<32> val;
// If this relocation is hidden, skip it.
if (error(rel_cur->getHidden(hidden))) goto skip_print_rel;
if (hidden) goto skip_print_rel;
if (error(rel_cur->getAddress(addr))) goto skip_print_rel;
// Stop when rel_cur's address is past the current instruction.
if (addr >= Index + Size) break;
if (error(rel_cur->getTypeName(name))) goto skip_print_rel;
if (error(rel_cur->getValueString(val))) goto skip_print_rel;
outs() << format("\t\t\t%8" PRIx64 ": ", SectionAddr + addr) << name
<< "\t" << val << "\n";
skip_print_rel:
++rel_cur;
}
}
}
}
}
static void PrintRelocations(const ObjectFile *o) {
error_code ec;
for (section_iterator si = o->begin_sections(), se = o->end_sections();
si != se; si.increment(ec)){
if (error(ec)) return;
if (si->begin_relocations() == si->end_relocations())
continue;
StringRef secname;
if (error(si->getName(secname))) continue;
outs() << "RELOCATION RECORDS FOR [" << secname << "]:\n";
for (relocation_iterator ri = si->begin_relocations(),
re = si->end_relocations();
ri != re; ri.increment(ec)) {
if (error(ec)) return;
bool hidden;
uint64_t address;
SmallString<32> relocname;
SmallString<32> valuestr;
if (error(ri->getHidden(hidden))) continue;
if (hidden) continue;
if (error(ri->getTypeName(relocname))) continue;
if (error(ri->getAddress(address))) continue;
if (error(ri->getValueString(valuestr))) continue;
outs() << address << " " << relocname << " " << valuestr << "\n";
}
outs() << "\n";
}
}
static void PrintSectionHeaders(const ObjectFile *o) {
outs() << "Sections:\n"
"Idx Name Size Address Type\n";
error_code ec;
unsigned i = 0;
for (section_iterator si = o->begin_sections(), se = o->end_sections();
si != se; si.increment(ec)) {
if (error(ec)) return;
StringRef Name;
if (error(si->getName(Name))) return;
uint64_t Address;
if (error(si->getAddress(Address))) return;
uint64_t Size;
if (error(si->getSize(Size))) return;
bool Text, Data, BSS;
if (error(si->isText(Text))) return;
if (error(si->isData(Data))) return;
if (error(si->isBSS(BSS))) return;
std::string Type = (std::string(Text ? "TEXT " : "") +
(Data ? "DATA " : "") + (BSS ? "BSS" : ""));
outs() << format("%3d %-13s %09" PRIx64 " %017" PRIx64 " %s\n",
i, Name.str().c_str(), Size, Address, Type.c_str());
++i;
}
}
static void PrintSectionContents(const ObjectFile *o) {
error_code ec;
for (section_iterator si = o->begin_sections(),
se = o->end_sections();
si != se; si.increment(ec)) {
if (error(ec)) return;
StringRef Name;
StringRef Contents;
uint64_t BaseAddr;
if (error(si->getName(Name))) continue;
if (error(si->getContents(Contents))) continue;
if (error(si->getAddress(BaseAddr))) continue;
outs() << "Contents of section " << Name << ":\n";
// Dump out the content as hex and printable ascii characters.
for (std::size_t addr = 0, end = Contents.size(); addr < end; addr += 16) {
outs() << format(" %04" PRIx64 " ", BaseAddr + addr);
// Dump line of hex.
for (std::size_t i = 0; i < 16; ++i) {
if (i != 0 && i % 4 == 0)
outs() << ' ';
if (addr + i < end)
outs() << hexdigit((Contents[addr + i] >> 4) & 0xF, true)
<< hexdigit(Contents[addr + i] & 0xF, true);
else
outs() << " ";
}
// Print ascii.
outs() << " ";
for (std::size_t i = 0; i < 16 && addr + i < end; ++i) {
if (std::isprint(Contents[addr + i] & 0xFF))
outs() << Contents[addr + i];
else
outs() << ".";
}
outs() << "\n";
}
}
}
static void PrintCOFFSymbolTable(const COFFObjectFile *coff) {
const coff_file_header *header;
if (error(coff->getHeader(header))) return;
int aux_count = 0;
const coff_symbol *symbol = 0;
for (int i = 0, e = header->NumberOfSymbols; i != e; ++i) {
if (aux_count--) {
// Figure out which type of aux this is.
if (symbol->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC
&& symbol->Value == 0) { // Section definition.
const coff_aux_section_definition *asd;
if (error(coff->getAuxSymbol<coff_aux_section_definition>(i, asd)))
return;
outs() << "AUX "
<< format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x "
, unsigned(asd->Length)
, unsigned(asd->NumberOfRelocations)
, unsigned(asd->NumberOfLinenumbers)
, unsigned(asd->CheckSum))
<< format("assoc %d comdat %d\n"
, unsigned(asd->Number)
, unsigned(asd->Selection));
} else
outs() << "AUX Unknown\n";
} else {
StringRef name;
if (error(coff->getSymbol(i, symbol))) return;
if (error(coff->getSymbolName(symbol, name))) return;
outs() << "[" << format("%2d", i) << "]"
<< "(sec " << format("%2d", int(symbol->SectionNumber)) << ")"
<< "(fl 0x00)" // Flag bits, which COFF doesn't have.
<< "(ty " << format("%3x", unsigned(symbol->Type)) << ")"
<< "(scl " << format("%3x", unsigned(symbol->StorageClass)) << ") "
<< "(nx " << unsigned(symbol->NumberOfAuxSymbols) << ") "
<< "0x" << format("%08x", unsigned(symbol->Value)) << " "
<< name << "\n";
aux_count = symbol->NumberOfAuxSymbols;
}
}
}
static void PrintSymbolTable(const ObjectFile *o) {
outs() << "SYMBOL TABLE:\n";
if (const COFFObjectFile *coff = dyn_cast<const COFFObjectFile>(o))
PrintCOFFSymbolTable(coff);
else {
error_code ec;
for (symbol_iterator si = o->begin_symbols(),
se = o->end_symbols(); si != se; si.increment(ec)) {
if (error(ec)) return;
StringRef Name;
uint64_t Address;
SymbolRef::Type Type;
uint64_t Size;
uint32_t Flags;
section_iterator Section = o->end_sections();
if (error(si->getName(Name))) continue;
if (error(si->getAddress(Address))) continue;
if (error(si->getFlags(Flags))) continue;
if (error(si->getType(Type))) continue;
if (error(si->getSize(Size))) continue;
if (error(si->getSection(Section))) continue;
bool Global = Flags & SymbolRef::SF_Global;
bool Weak = Flags & SymbolRef::SF_Weak;
bool Absolute = Flags & SymbolRef::SF_Absolute;
if (Address == UnknownAddressOrSize)
Address = 0;
if (Size == UnknownAddressOrSize)
Size = 0;
char GlobLoc = ' ';
if (Type != SymbolRef::ST_Unknown)
GlobLoc = Global ? 'g' : 'l';
char Debug = (Type == SymbolRef::ST_Debug || Type == SymbolRef::ST_File)
? 'd' : ' ';
char FileFunc = ' ';
if (Type == SymbolRef::ST_File)
FileFunc = 'f';
else if (Type == SymbolRef::ST_Function)
FileFunc = 'F';
outs() << format("%08" PRIx64, Address) << " "
<< GlobLoc // Local -> 'l', Global -> 'g', Neither -> ' '
<< (Weak ? 'w' : ' ') // Weak?
<< ' ' // Constructor. Not supported yet.
<< ' ' // Warning. Not supported yet.
<< ' ' // Indirect reference to another symbol.
<< Debug // Debugging (d) or dynamic (D) symbol.
<< FileFunc // Name of function (F), file (f) or object (O).
<< ' ';
if (Absolute)
outs() << "*ABS*";
else if (Section == o->end_sections())
outs() << "*UND*";
else {
if (const MachOObjectFile *MachO = dyn_cast<const MachOObjectFile>(o)) {
StringRef SegmentName;
DataRefImpl DR = Section->getRawDataRefImpl();
if (error(MachO->getSectionFinalSegmentName(DR, SegmentName)))
SegmentName = "";
outs() << SegmentName << ",";
}
StringRef SectionName;
if (error(Section->getName(SectionName)))
SectionName = "";
outs() << SectionName;
}
outs() << '\t'
<< format("%08" PRIx64 " ", Size)
<< Name
<< '\n';
}
}
}
static void PrintUnwindInfo(const ObjectFile *o) {
outs() << "Unwind info:\n\n";
if (const COFFObjectFile *coff = dyn_cast<COFFObjectFile>(o)) {
printCOFFUnwindInfo(coff);
} else {
// TODO: Extract DWARF dump tool to objdump.
errs() << "This operation is only currently supported "
"for COFF object files.\n";
return;
}
}
static void DumpObject(const ObjectFile *o) {
outs() << '\n';
outs() << o->getFileName()
<< ":\tfile format " << o->getFileFormatName() << "\n\n";
if (Disassemble)
DisassembleObject(o, Relocations);
if (Relocations && !Disassemble)
PrintRelocations(o);
if (SectionHeaders)
PrintSectionHeaders(o);
if (SectionContents)
PrintSectionContents(o);
if (SymbolTable)
PrintSymbolTable(o);
if (UnwindInfo)
PrintUnwindInfo(o);
}
/// @brief Dump each object file in \a a;
static void DumpArchive(const Archive *a) {
for (Archive::child_iterator i = a->begin_children(),
e = a->end_children(); i != e; ++i) {
OwningPtr<Binary> child;
if (error_code ec = i->getAsBinary(child)) {
// Ignore non-object files.
if (ec != object_error::invalid_file_type)
errs() << ToolName << ": '" << a->getFileName() << "': " << ec.message()
<< ".\n";
continue;
}
if (ObjectFile *o = dyn_cast<ObjectFile>(child.get()))
DumpObject(o);
else
errs() << ToolName << ": '" << a->getFileName() << "': "
<< "Unrecognized file type.\n";
}
}
/// @brief Open file and figure out how to dump it.
static void DumpInput(StringRef file) {
// If file isn't stdin, check that it exists.
if (file != "-" && !sys::fs::exists(file)) {
errs() << ToolName << ": '" << file << "': " << "No such file\n";
return;
}
if (MachOOpt && Disassemble) {
DisassembleInputMachO(file);
return;
}
// Attempt to open the binary.
OwningPtr<Binary> binary;
if (error_code ec = createBinary(file, binary)) {
errs() << ToolName << ": '" << file << "': " << ec.message() << ".\n";
return;
}
if (Archive *a = dyn_cast<Archive>(binary.get()))
DumpArchive(a);
else if (ObjectFile *o = dyn_cast<ObjectFile>(binary.get()))
DumpObject(o);
else
errs() << ToolName << ": '" << file << "': " << "Unrecognized file type.\n";
}
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
// Initialize targets and assembly printers/parsers.
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllDisassemblers();
// Register the target printer for --version.
cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
cl::ParseCommandLineOptions(argc, argv, "llvm object file dumper\n");
TripleName = Triple::normalize(TripleName);
ToolName = argv[0];
// Defaults to a.out if no filenames specified.
if (InputFilenames.size() == 0)
InputFilenames.push_back("a.out");
if (!Disassemble
&& !Relocations
&& !SectionHeaders
&& !SectionContents
&& !SymbolTable
&& !UnwindInfo) {
cl::PrintHelpMessage();
return 2;
}
std::for_each(InputFilenames.begin(), InputFilenames.end(),
DumpInput);
return 0;
}
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