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freebsd-dev/contrib/llvm/tools/llvm-nm/llvm-nm.cpp
Dimitry Andric f785676f2a Upgrade our copy of llvm/clang to 3.4 release. This version supports 
all of the features in the current working draft of the upcoming C++
standard, provisionally named C++1y.

The code generator's performance is greatly increased, and the loop
auto-vectorizer is now enabled at -Os and -O2 in addition to -O3.  The
PowerPC backend has made several major improvements to code generation
quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ
backends have all seen major feature work.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.4/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html>

MFC after:	1 month
2014-02-16 19:44:07 +00:00

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//===-- llvm-nm.cpp - Symbol table 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 traditional Unix "nm", that is, it
// prints out the names of symbols in a bitcode or object file, along with some
// information about each symbol.
//
// This "nm" supports many of the features of GNU "nm", including its different
// output formats.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/LLVMContext.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/IR/Module.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/COFF.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <algorithm>
#include <cctype>
#include <cerrno>
#include <cstring>
#include <vector>
using namespace llvm;
using namespace object;
namespace {
enum OutputFormatTy { bsd, sysv, posix };
cl::opt<OutputFormatTy>
OutputFormat("format",
cl::desc("Specify output format"),
cl::values(clEnumVal(bsd, "BSD format"),
clEnumVal(sysv, "System V format"),
clEnumVal(posix, "POSIX.2 format"),
clEnumValEnd), cl::init(bsd));
cl::alias OutputFormat2("f", cl::desc("Alias for --format"),
cl::aliasopt(OutputFormat));
cl::list<std::string>
InputFilenames(cl::Positional, cl::desc("<input bitcode files>"),
cl::ZeroOrMore);
cl::opt<bool> UndefinedOnly("undefined-only",
cl::desc("Show only undefined symbols"));
cl::alias UndefinedOnly2("u", cl::desc("Alias for --undefined-only"),
cl::aliasopt(UndefinedOnly));
cl::opt<bool> DynamicSyms("dynamic",
cl::desc("Display the dynamic symbols instead "
"of normal symbols."));
cl::alias DynamicSyms2("D", cl::desc("Alias for --dynamic"),
cl::aliasopt(DynamicSyms));
cl::opt<bool> DefinedOnly("defined-only",
cl::desc("Show only defined symbols"));
cl::opt<bool> ExternalOnly("extern-only",
cl::desc("Show only external symbols"));
cl::alias ExternalOnly2("g", cl::desc("Alias for --extern-only"),
cl::aliasopt(ExternalOnly));
cl::opt<bool> BSDFormat("B", cl::desc("Alias for --format=bsd"));
cl::opt<bool> POSIXFormat("P", cl::desc("Alias for --format=posix"));
cl::opt<bool> PrintFileName("print-file-name",
cl::desc("Precede each symbol with the object file it came from"));
cl::alias PrintFileNameA("A", cl::desc("Alias for --print-file-name"),
cl::aliasopt(PrintFileName));
cl::alias PrintFileNameo("o", cl::desc("Alias for --print-file-name"),
cl::aliasopt(PrintFileName));
cl::opt<bool> DebugSyms("debug-syms",
cl::desc("Show all symbols, even debugger only"));
cl::alias DebugSymsa("a", cl::desc("Alias for --debug-syms"),
cl::aliasopt(DebugSyms));
cl::opt<bool> NumericSort("numeric-sort",
cl::desc("Sort symbols by address"));
cl::alias NumericSortn("n", cl::desc("Alias for --numeric-sort"),
cl::aliasopt(NumericSort));
cl::alias NumericSortv("v", cl::desc("Alias for --numeric-sort"),
cl::aliasopt(NumericSort));
cl::opt<bool> NoSort("no-sort",
cl::desc("Show symbols in order encountered"));
cl::alias NoSortp("p", cl::desc("Alias for --no-sort"),
cl::aliasopt(NoSort));
cl::opt<bool> PrintSize("print-size",
cl::desc("Show symbol size instead of address"));
cl::alias PrintSizeS("S", cl::desc("Alias for --print-size"),
cl::aliasopt(PrintSize));
cl::opt<bool> SizeSort("size-sort", cl::desc("Sort symbols by size"));
cl::opt<bool> WithoutAliases("without-aliases", cl::Hidden,
cl::desc("Exclude aliases from output"));
cl::opt<bool> ArchiveMap("print-armap",
cl::desc("Print the archive map"));
cl::alias ArchiveMaps("s", cl::desc("Alias for --print-armap"),
cl::aliasopt(ArchiveMap));
bool PrintAddress = true;
bool MultipleFiles = false;
bool HadError = false;
std::string ToolName;
}
static void error(Twine message, Twine path = Twine()) {
errs() << ToolName << ": " << path << ": " << message << ".\n";
}
static bool error(error_code ec, Twine path = Twine()) {
if (ec) {
error(ec.message(), path);
HadError = true;
return true;
}
return false;
}
namespace {
struct NMSymbol {
uint64_t Address;
uint64_t Size;
char TypeChar;
StringRef Name;
};
static bool CompareSymbolAddress(const NMSymbol &a, const NMSymbol &b) {
if (a.Address < b.Address)
return true;
else if (a.Address == b.Address && a.Name < b.Name)
return true;
else if (a.Address == b.Address && a.Name == b.Name && a.Size < b.Size)
return true;
else
return false;
}
static bool CompareSymbolSize(const NMSymbol &a, const NMSymbol &b) {
if (a.Size < b.Size)
return true;
else if (a.Size == b.Size && a.Name < b.Name)
return true;
else if (a.Size == b.Size && a.Name == b.Name && a.Address < b.Address)
return true;
else
return false;
}
static bool CompareSymbolName(const NMSymbol &a, const NMSymbol &b) {
if (a.Name < b.Name)
return true;
else if (a.Name == b.Name && a.Size < b.Size)
return true;
else if (a.Name == b.Name && a.Size == b.Size && a.Address < b.Address)
return true;
else
return false;
}
StringRef CurrentFilename;
typedef std::vector<NMSymbol> SymbolListT;
SymbolListT SymbolList;
}
static void SortAndPrintSymbolList() {
if (!NoSort) {
if (NumericSort)
std::sort(SymbolList.begin(), SymbolList.end(), CompareSymbolAddress);
else if (SizeSort)
std::sort(SymbolList.begin(), SymbolList.end(), CompareSymbolSize);
else
std::sort(SymbolList.begin(), SymbolList.end(), CompareSymbolName);
}
if (OutputFormat == posix && MultipleFiles) {
outs() << '\n' << CurrentFilename << ":\n";
} else if (OutputFormat == bsd && MultipleFiles) {
outs() << "\n" << CurrentFilename << ":\n";
} else if (OutputFormat == sysv) {
outs() << "\n\nSymbols from " << CurrentFilename << ":\n\n"
<< "Name Value Class Type"
<< " Size Line Section\n";
}
for (SymbolListT::iterator i = SymbolList.begin(),
e = SymbolList.end(); i != e; ++i) {
if ((i->TypeChar != 'U') && UndefinedOnly)
continue;
if ((i->TypeChar == 'U') && DefinedOnly)
continue;
if (SizeSort && !PrintAddress && i->Size == UnknownAddressOrSize)
continue;
char SymbolAddrStr[10] = "";
char SymbolSizeStr[10] = "";
if (OutputFormat == sysv || i->Address == object::UnknownAddressOrSize)
strcpy(SymbolAddrStr, " ");
if (OutputFormat == sysv)
strcpy(SymbolSizeStr, " ");
if (i->Address != object::UnknownAddressOrSize)
format("%08" PRIx64, i->Address).print(SymbolAddrStr,
sizeof(SymbolAddrStr));
if (i->Size != object::UnknownAddressOrSize)
format("%08" PRIx64, i->Size).print(SymbolSizeStr, sizeof(SymbolSizeStr));
if (OutputFormat == posix) {
outs() << i->Name << " " << i->TypeChar << " "
<< SymbolAddrStr << SymbolSizeStr << "\n";
} else if (OutputFormat == bsd) {
if (PrintAddress)
outs() << SymbolAddrStr << ' ';
if (PrintSize) {
outs() << SymbolSizeStr;
if (i->Size != object::UnknownAddressOrSize)
outs() << ' ';
}
outs() << i->TypeChar << " " << i->Name << "\n";
} else if (OutputFormat == sysv) {
std::string PaddedName (i->Name);
while (PaddedName.length () < 20)
PaddedName += " ";
outs() << PaddedName << "|" << SymbolAddrStr << "| "
<< i->TypeChar
<< " | |" << SymbolSizeStr << "| |\n";
}
}
SymbolList.clear();
}
static char TypeCharForSymbol(GlobalValue &GV) {
if (GV.isDeclaration()) return 'U';
if (GV.hasLinkOnceLinkage()) return 'C';
if (GV.hasCommonLinkage()) return 'C';
if (GV.hasWeakLinkage()) return 'W';
if (isa<Function>(GV) && GV.hasInternalLinkage()) return 't';
if (isa<Function>(GV)) return 'T';
if (isa<GlobalVariable>(GV) && GV.hasInternalLinkage()) return 'd';
if (isa<GlobalVariable>(GV)) return 'D';
if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(&GV)) {
const GlobalValue *AliasedGV = GA->getAliasedGlobal();
if (isa<Function>(AliasedGV)) return 'T';
if (isa<GlobalVariable>(AliasedGV)) return 'D';
}
return '?';
}
static void DumpSymbolNameForGlobalValue(GlobalValue &GV) {
// Private linkage and available_externally linkage don't exist in symtab.
if (GV.hasPrivateLinkage() ||
GV.hasLinkerPrivateLinkage() ||
GV.hasLinkerPrivateWeakLinkage() ||
GV.hasAvailableExternallyLinkage())
return;
char TypeChar = TypeCharForSymbol(GV);
if (GV.hasLocalLinkage () && ExternalOnly)
return;
NMSymbol s;
s.Address = object::UnknownAddressOrSize;
s.Size = object::UnknownAddressOrSize;
s.TypeChar = TypeChar;
s.Name = GV.getName();
SymbolList.push_back(s);
}
static void DumpSymbolNamesFromModule(Module *M) {
CurrentFilename = M->getModuleIdentifier();
std::for_each (M->begin(), M->end(), DumpSymbolNameForGlobalValue);
std::for_each (M->global_begin(), M->global_end(),
DumpSymbolNameForGlobalValue);
if (!WithoutAliases)
std::for_each (M->alias_begin(), M->alias_end(),
DumpSymbolNameForGlobalValue);
SortAndPrintSymbolList();
}
template <class ELFT>
error_code getSymbolNMTypeChar(ELFObjectFile<ELFT> &Obj, symbol_iterator I,
char &Result) {
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
DataRefImpl Symb = I->getRawDataRefImpl();
const Elf_Sym *ESym = Obj.getSymbol(Symb);
const ELFFile<ELFT> &EF = *Obj.getELFFile();
const Elf_Shdr *ESec = EF.getSection(ESym);
char ret = '?';
if (ESec) {
switch (ESec->sh_type) {
case ELF::SHT_PROGBITS:
case ELF::SHT_DYNAMIC:
switch (ESec->sh_flags) {
case(ELF::SHF_ALLOC | ELF::SHF_EXECINSTR) :
ret = 't';
break;
case(ELF::SHF_ALLOC | ELF::SHF_WRITE) :
ret = 'd';
break;
case ELF::SHF_ALLOC:
case(ELF::SHF_ALLOC | ELF::SHF_MERGE) :
case(ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS) :
ret = 'r';
break;
}
break;
case ELF::SHT_NOBITS:
ret = 'b';
}
}
switch (EF.getSymbolTableIndex(ESym)) {
case ELF::SHN_UNDEF:
if (ret == '?')
ret = 'U';
break;
case ELF::SHN_ABS:
ret = 'a';
break;
case ELF::SHN_COMMON:
ret = 'c';
break;
}
switch (ESym->getBinding()) {
case ELF::STB_GLOBAL:
ret = ::toupper(ret);
break;
case ELF::STB_WEAK:
if (EF.getSymbolTableIndex(ESym) == ELF::SHN_UNDEF)
ret = 'w';
else if (ESym->getType() == ELF::STT_OBJECT)
ret = 'V';
else
ret = 'W';
}
if (ret == '?' && ESym->getType() == ELF::STT_SECTION) {
StringRef Name;
error_code EC = I->getName(Name);
if (EC)
return EC;
Result = StringSwitch<char>(Name)
.StartsWith(".debug", 'N')
.StartsWith(".note", 'n')
.Default('?');
return object_error::success;
}
Result = ret;
return object_error::success;
}
static error_code getSymbolNMTypeChar(COFFObjectFile &Obj, symbol_iterator I,
char &Result) {
const coff_symbol *symb = Obj.getCOFFSymbol(I);
StringRef name;
if (error_code ec = I->getName(name))
return ec;
char ret = StringSwitch<char>(name)
.StartsWith(".debug", 'N')
.StartsWith(".sxdata", 'N')
.Default('?');
if (ret != '?') {
Result = ret;
return object_error::success;
}
uint32_t Characteristics = 0;
if (symb->SectionNumber > 0) {
section_iterator SecI = Obj.end_sections();
if (error_code ec = I->getSection(SecI))
return ec;
const coff_section *Section = Obj.getCOFFSection(SecI);
Characteristics = Section->Characteristics;
}
switch (symb->SectionNumber) {
case COFF::IMAGE_SYM_UNDEFINED:
// Check storage classes.
if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_WEAK_EXTERNAL) {
Result = 'w';
return object_error::success; // Don't do ::toupper.
} else if (symb->Value != 0) // Check for common symbols.
ret = 'c';
else
ret = 'u';
break;
case COFF::IMAGE_SYM_ABSOLUTE:
ret = 'a';
break;
case COFF::IMAGE_SYM_DEBUG:
ret = 'n';
break;
default:
// Check section type.
if (Characteristics & COFF::IMAGE_SCN_CNT_CODE)
ret = 't';
else if (Characteristics & COFF::IMAGE_SCN_MEM_READ &&
~Characteristics & COFF::IMAGE_SCN_MEM_WRITE) // Read only.
ret = 'r';
else if (Characteristics & COFF::IMAGE_SCN_CNT_INITIALIZED_DATA)
ret = 'd';
else if (Characteristics & COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA)
ret = 'b';
else if (Characteristics & COFF::IMAGE_SCN_LNK_INFO)
ret = 'i';
// Check for section symbol.
else if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_STATIC &&
symb->Value == 0)
ret = 's';
}
if (symb->StorageClass == COFF::IMAGE_SYM_CLASS_EXTERNAL)
ret = ::toupper(static_cast<unsigned char>(ret));
Result = ret;
return object_error::success;
}
static uint8_t getNType(MachOObjectFile &Obj, DataRefImpl Symb) {
if (Obj.is64Bit()) {
MachO::nlist_64 STE = Obj.getSymbol64TableEntry(Symb);
return STE.n_type;
}
MachO::nlist STE = Obj.getSymbolTableEntry(Symb);
return STE.n_type;
}
static error_code getSymbolNMTypeChar(MachOObjectFile &Obj, symbol_iterator I,
char &Res) {
DataRefImpl Symb = I->getRawDataRefImpl();
uint8_t NType = getNType(Obj, Symb);
char Char;
switch (NType & MachO::N_TYPE) {
case MachO::N_UNDF:
Char = 'u';
break;
case MachO::N_ABS:
Char = 's';
break;
case MachO::N_SECT: {
section_iterator Sec = Obj.end_sections();
Obj.getSymbolSection(Symb, Sec);
DataRefImpl Ref = Sec->getRawDataRefImpl();
StringRef SectionName;
Obj.getSectionName(Ref, SectionName);
StringRef SegmentName = Obj.getSectionFinalSegmentName(Ref);
if (SegmentName == "__TEXT" && SectionName == "__text")
Char = 't';
else
Char = 's';
} break;
default:
Char = '?';
break;
}
if (NType & (MachO::N_EXT | MachO::N_PEXT))
Char = toupper(static_cast<unsigned char>(Char));
Res = Char;
return object_error::success;
}
static char getNMTypeChar(ObjectFile *Obj, symbol_iterator I) {
char Res = '?';
if (COFFObjectFile *COFF = dyn_cast<COFFObjectFile>(Obj)) {
error(getSymbolNMTypeChar(*COFF, I, Res));
return Res;
}
if (MachOObjectFile *MachO = dyn_cast<MachOObjectFile>(Obj)) {
error(getSymbolNMTypeChar(*MachO, I, Res));
return Res;
}
if (ELF32LEObjectFile *ELF = dyn_cast<ELF32LEObjectFile>(Obj)) {
error(getSymbolNMTypeChar(*ELF, I, Res));
return Res;
}
if (ELF64LEObjectFile *ELF = dyn_cast<ELF64LEObjectFile>(Obj)) {
error(getSymbolNMTypeChar(*ELF, I, Res));
return Res;
}
if (ELF32BEObjectFile *ELF = dyn_cast<ELF32BEObjectFile>(Obj)) {
error(getSymbolNMTypeChar(*ELF, I, Res));
return Res;
}
ELF64BEObjectFile *ELF = cast<ELF64BEObjectFile>(Obj);
error(getSymbolNMTypeChar(*ELF, I, Res));
return Res;
}
static void DumpSymbolNamesFromObject(ObjectFile *obj) {
error_code ec;
symbol_iterator ibegin = obj->begin_symbols();
symbol_iterator iend = obj->end_symbols();
if (DynamicSyms) {
ibegin = obj->begin_dynamic_symbols();
iend = obj->end_dynamic_symbols();
}
for (symbol_iterator i = ibegin; i != iend; i.increment(ec)) {
if (error(ec)) break;
uint32_t symflags;
if (error(i->getFlags(symflags))) break;
if (!DebugSyms && (symflags & SymbolRef::SF_FormatSpecific))
continue;
NMSymbol s;
s.Size = object::UnknownAddressOrSize;
s.Address = object::UnknownAddressOrSize;
if (PrintSize || SizeSort) {
if (error(i->getSize(s.Size))) break;
}
if (PrintAddress)
if (error(i->getAddress(s.Address))) break;
s.TypeChar = getNMTypeChar(obj, i);
if (error(i->getName(s.Name))) break;
SymbolList.push_back(s);
}
CurrentFilename = obj->getFileName();
SortAndPrintSymbolList();
}
static void DumpSymbolNamesFromFile(std::string &Filename) {
if (Filename != "-" && !sys::fs::exists(Filename)) {
errs() << ToolName << ": '" << Filename << "': " << "No such file\n";
return;
}
OwningPtr<MemoryBuffer> Buffer;
if (error(MemoryBuffer::getFileOrSTDIN(Filename, Buffer), Filename))
return;
sys::fs::file_magic magic = sys::fs::identify_magic(Buffer->getBuffer());
LLVMContext &Context = getGlobalContext();
std::string ErrorMessage;
if (magic == sys::fs::file_magic::bitcode) {
Module *Result = 0;
Result = ParseBitcodeFile(Buffer.get(), Context, &ErrorMessage);
if (Result) {
DumpSymbolNamesFromModule(Result);
delete Result;
} else {
error(ErrorMessage, Filename);
return;
}
} else if (magic == sys::fs::file_magic::archive) {
OwningPtr<Binary> arch;
if (error(object::createBinary(Buffer.take(), arch), Filename))
return;
if (object::Archive *a = dyn_cast<object::Archive>(arch.get())) {
if (ArchiveMap) {
object::Archive::symbol_iterator I = a->begin_symbols();
object::Archive::symbol_iterator E = a->end_symbols();
if (I !=E) {
outs() << "Archive map" << "\n";
for (; I != E; ++I) {
object::Archive::child_iterator c;
StringRef symname;
StringRef filename;
if (error(I->getMember(c)))
return;
if (error(I->getName(symname)))
return;
if (error(c->getName(filename)))
return;
outs() << symname << " in " << filename << "\n";
}
outs() << "\n";
}
}
for (object::Archive::child_iterator i = a->begin_children(),
e = a->end_children(); i != e; ++i) {
OwningPtr<Binary> child;
if (i->getAsBinary(child)) {
// Try opening it as a bitcode file.
OwningPtr<MemoryBuffer> buff;
if (error(i->getMemoryBuffer(buff)))
return;
Module *Result = 0;
if (buff)
Result = ParseBitcodeFile(buff.get(), Context, &ErrorMessage);
if (Result) {
DumpSymbolNamesFromModule(Result);
delete Result;
}
continue;
}
if (object::ObjectFile *o = dyn_cast<ObjectFile>(child.get())) {
outs() << o->getFileName() << ":\n";
DumpSymbolNamesFromObject(o);
}
}
}
} else if (magic == sys::fs::file_magic::macho_universal_binary) {
OwningPtr<Binary> Bin;
if (error(object::createBinary(Buffer.take(), Bin), Filename))
return;
object::MachOUniversalBinary *UB =
cast<object::MachOUniversalBinary>(Bin.get());
for (object::MachOUniversalBinary::object_iterator
I = UB->begin_objects(),
E = UB->end_objects();
I != E; ++I) {
OwningPtr<ObjectFile> Obj;
if (!I->getAsObjectFile(Obj)) {
outs() << Obj->getFileName() << ":\n";
DumpSymbolNamesFromObject(Obj.get());
}
}
} else if (magic.is_object()) {
OwningPtr<Binary> obj;
if (error(object::createBinary(Buffer.take(), obj), Filename))
return;
if (object::ObjectFile *o = dyn_cast<ObjectFile>(obj.get()))
DumpSymbolNamesFromObject(o);
} else {
errs() << ToolName << ": " << Filename << ": "
<< "unrecognizable file type\n";
HadError = true;
return;
}
}
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.
cl::ParseCommandLineOptions(argc, argv, "llvm symbol table dumper\n");
// llvm-nm only reads binary files.
if (error(sys::ChangeStdinToBinary()))
return 1;
ToolName = argv[0];
if (BSDFormat) OutputFormat = bsd;
if (POSIXFormat) OutputFormat = posix;
// The relative order of these is important. If you pass --size-sort it should
// only print out the size. However, if you pass -S --size-sort, it should
// print out both the size and address.
if (SizeSort && !PrintSize) PrintAddress = false;
if (OutputFormat == sysv || SizeSort) PrintSize = true;
switch (InputFilenames.size()) {
case 0: InputFilenames.push_back("-");
case 1: break;
default: MultipleFiles = true;
}
std::for_each(InputFilenames.begin(), InputFilenames.end(),
DumpSymbolNamesFromFile);
if (HadError)
return 1;
return 0;
}
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