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llvm-mirror/tools/llvm-objdump/llvm-objdump.cpp

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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.
//
// The flags and output of this program should be near identical to those of
// binutils objdump.
//
//===----------------------------------------------------------------------===//
#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 cl::opt<bool>
PrivateHeaders("private-headers",
cl::desc("Display format specific file headers"));
static cl::alias
PrivateHeadersShort("p", cl::desc("Alias for --private-headers"),
cl::aliasopt(PrivateHeaders));
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 %08" PRIx64 " %016" 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(static_cast<unsigned char>(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';
const char *Fmt = o->getBytesInAddress() > 4 ? "%016" PRIx64 :
"%08" PRIx64;
outs() << format(Fmt, 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);
if (PrivateHeaders && o->isELF())
printELFFileHeader(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
&& !PrivateHeaders) {
cl::PrintHelpMessage();
return 2;
}
std::for_each(InputFilenames.begin(), InputFilenames.end(),
DumpInput);
return 0;
}
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