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llvm-mirror/tools/llvm-dwarfdump/llvm-dwarfdump.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===-- llvm-dwarfdump.cpp - Debug info dumping utility for llvm ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This program is a utility that works like "dwarfdump".
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/ADT/Triple.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Object/Archive.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/InitLLVM.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace object;
/// Parser for options that take an optional offest argument.
/// @{
struct OffsetOption {
uint64_t Val = 0;
bool HasValue = false;
bool IsRequested = false;
};
namespace llvm {
namespace cl {
template <>
class parser<OffsetOption> final : public basic_parser<OffsetOption> {
public:
parser(Option &O) : basic_parser(O) {}
/// Return true on error.
bool parse(Option &O, StringRef ArgName, StringRef Arg, OffsetOption &Val) {
if (Arg == "") {
Val.Val = 0;
Val.HasValue = false;
Val.IsRequested = true;
return false;
}
if (Arg.getAsInteger(0, Val.Val))
return O.error("'" + Arg + "' value invalid for integer argument!");
Val.HasValue = true;
Val.IsRequested = true;
return false;
}
enum ValueExpected getValueExpectedFlagDefault() const {
return ValueOptional;
}
void printOptionInfo(const Option &O, size_t GlobalWidth) const {
outs() << " -" << O.ArgStr;
Option::printHelpStr(O.HelpStr, GlobalWidth, getOptionWidth(O));
}
void printOptionDiff(const Option &O, OffsetOption V, OptVal Default,
size_t GlobalWidth) const {
printOptionName(O, GlobalWidth);
outs() << "[=offset]";
}
// An out-of-line virtual method to provide a 'home' for this class.
void anchor() override {};
};
} // cl
} // llvm
/// @}
/// Command line options.
/// @{
namespace {
using namespace cl;
OptionCategory DwarfDumpCategory("Specific Options");
static opt<bool> Help("h", desc("Alias for -help"), Hidden,
cat(DwarfDumpCategory));
static list<std::string>
InputFilenames(Positional, desc("<input object files or .dSYM bundles>"),
ZeroOrMore, cat(DwarfDumpCategory));
cl::OptionCategory SectionCategory("Section-specific Dump Options",
"These control which sections are dumped. "
"Where applicable these parameters take an "
"optional =<offset> argument to dump only "
"the entry at the specified offset.");
static opt<bool> DumpAll("all", desc("Dump all debug info sections"),
cat(SectionCategory));
static alias DumpAllAlias("a", desc("Alias for -all"), aliasopt(DumpAll));
// Options for dumping specific sections.
static unsigned DumpType = DIDT_Null;
static std::array<llvm::Optional<uint64_t>, (unsigned)DIDT_ID_Count>
DumpOffsets;
#define HANDLE_DWARF_SECTION(ENUM_NAME, ELF_NAME, CMDLINE_NAME) \
static opt<OffsetOption> Dump##ENUM_NAME( \
CMDLINE_NAME, desc("Dump the " ELF_NAME " section"), \
cat(SectionCategory));
#include "llvm/BinaryFormat/Dwarf.def"
#undef HANDLE_DWARF_SECTION
static alias DumpDebugFrameAlias("eh-frame", desc("Alias for -debug-frame"),
NotHidden, cat(SectionCategory),
aliasopt(DumpDebugFrame));
static list<std::string>
ArchFilters("arch",
desc("Dump debug information for the specified CPU "
"architecture only. Architectures may be specified by "
"name or by number. This option can be specified "
"multiple times, once for each desired architecture."),
cat(DwarfDumpCategory));
static opt<bool>
Diff("diff",
desc("Emit diff-friendly output by omitting offsets and addresses."),
cat(DwarfDumpCategory));
static list<std::string>
Find("find",
desc("Search for the exact match for <name> in the accelerator tables "
"and print the matching debug information entries. When no "
"accelerator tables are available, the slower but more complete "
"-name option can be used instead."),
value_desc("name"), cat(DwarfDumpCategory));
static alias FindAlias("f", desc("Alias for -find."), aliasopt(Find));
static opt<bool>
IgnoreCase("ignore-case",
desc("Ignore case distinctions in when searching by name."),
value_desc("i"), cat(DwarfDumpCategory));
static alias IgnoreCaseAlias("i", desc("Alias for -ignore-case."),
aliasopt(IgnoreCase));
static list<std::string> Name(
"name",
desc("Find and print all debug info entries whose name (DW_AT_name "
"attribute) matches the exact text in <pattern>. When used with the "
"the -regex option <pattern> is interpreted as a regular expression."),
value_desc("pattern"), cat(DwarfDumpCategory));
static alias NameAlias("n", desc("Alias for -name"), aliasopt(Name));
static opt<unsigned long long> Lookup("lookup",
desc("Lookup <address> in the debug information and print out any "
"available file, function, block and line table details."),
value_desc("address"), cat(DwarfDumpCategory));
static opt<std::string>
OutputFilename("out-file", cl::init(""),
cl::desc("Redirect output to the specified file."),
cl::value_desc("filename"));
static alias OutputFilenameAlias("o", desc("Alias for -out-file."),
aliasopt(OutputFilename),
cat(DwarfDumpCategory));
static opt<bool>
UseRegex("regex",
desc("Treat any <pattern> strings as regular expressions when "
"searching instead of just as an exact string match."),
cat(DwarfDumpCategory));
static alias RegexAlias("x", desc("Alias for -regex"), aliasopt(UseRegex));
static opt<bool>
ShowChildren("show-children",
desc("Show a debug info entry's children when selectively "
"printing with the =<offset> option."),
cat(DwarfDumpCategory));
static alias ShowChildrenAlias("c", desc("Alias for -show-children."),
aliasopt(ShowChildren));
static opt<bool>
ShowParents("show-parents",
desc("Show a debug info entry's parents when selectively "
"printing with the =<offset> option."),
cat(DwarfDumpCategory));
static alias ShowParentsAlias("p", desc("Alias for -show-parents."),
aliasopt(ShowParents));
static opt<bool>
ShowForm("show-form",
desc("Show DWARF form types after the DWARF attribute types."),
cat(DwarfDumpCategory));
static alias ShowFormAlias("F", desc("Alias for -show-form."),
aliasopt(ShowForm), cat(DwarfDumpCategory));
static opt<unsigned> RecurseDepth(
"recurse-depth",
desc("Only recurse to a depth of N when displaying debug info entries."),
cat(DwarfDumpCategory), init(-1U), value_desc("N"));
static alias RecurseDepthAlias("r", desc("Alias for -recurse-depth."),
aliasopt(RecurseDepth));
static opt<bool>
SummarizeTypes("summarize-types",
desc("Abbreviate the description of type unit entries."),
cat(DwarfDumpCategory));
static cl::opt<bool>
Statistics("statistics",
cl::desc("Emit JSON-formatted debug info quality metrics."),
cat(DwarfDumpCategory));
static opt<bool> Verify("verify", desc("Verify the DWARF debug info."),
cat(DwarfDumpCategory));
static opt<bool> Quiet("quiet", desc("Use with -verify to not emit to STDOUT."),
cat(DwarfDumpCategory));
static opt<bool> DumpUUID("uuid", desc("Show the UUID for each architecture."),
cat(DwarfDumpCategory));
static alias DumpUUIDAlias("u", desc("Alias for -uuid."), aliasopt(DumpUUID));
static opt<bool> Verbose("verbose",
desc("Print more low-level encoding details."),
cat(DwarfDumpCategory));
static alias VerboseAlias("v", desc("Alias for -verbose."), aliasopt(Verbose),
cat(DwarfDumpCategory));
} // namespace
/// @}
//===----------------------------------------------------------------------===//
static void error(StringRef Prefix, std::error_code EC) {
if (!EC)
return;
WithColor::error() << Prefix << ": " << EC.message() << "\n";
exit(1);
}
static DIDumpOptions getDumpOpts() {
DIDumpOptions DumpOpts;
DumpOpts.DumpType = DumpType;
DumpOpts.RecurseDepth = RecurseDepth;
DumpOpts.ShowAddresses = !Diff;
DumpOpts.ShowChildren = ShowChildren;
DumpOpts.ShowParents = ShowParents;
DumpOpts.ShowForm = ShowForm;
DumpOpts.SummarizeTypes = SummarizeTypes;
DumpOpts.Verbose = Verbose;
// In -verify mode, print DIEs without children in error messages.
if (Verify)
return DumpOpts.noImplicitRecursion();
return DumpOpts;
}
static uint32_t getCPUType(MachOObjectFile &MachO) {
if (MachO.is64Bit())
return MachO.getHeader64().cputype;
else
return MachO.getHeader().cputype;
}
/// Return true if the object file has not been filtered by an --arch option.
static bool filterArch(ObjectFile &Obj) {
if (ArchFilters.empty())
return true;
if (auto *MachO = dyn_cast<MachOObjectFile>(&Obj)) {
std::string ObjArch =
Triple::getArchTypeName(MachO->getArchTriple().getArch());
for (auto Arch : ArchFilters) {
// Match name.
if (Arch == ObjArch)
return true;
// Match architecture number.
unsigned Value;
if (!StringRef(Arch).getAsInteger(0, Value))
if (Value == getCPUType(*MachO))
return true;
}
}
return false;
}
using HandlerFn = std::function<bool(ObjectFile &, DWARFContext &DICtx, Twine,
raw_ostream &)>;
/// Print only DIEs that have a certain name.
static bool filterByName(const StringSet<> &Names, DWARFDie Die,
StringRef NameRef, raw_ostream &OS) {
std::string Name =
(IgnoreCase && !UseRegex) ? NameRef.lower() : NameRef.str();
if (UseRegex) {
// Match regular expression.
for (auto Pattern : Names.keys()) {
Regex RE(Pattern, IgnoreCase ? Regex::IgnoreCase : Regex::NoFlags);
std::string Error;
if (!RE.isValid(Error)) {
errs() << "error in regular expression: " << Error << "\n";
exit(1);
}
if (RE.match(Name)) {
Die.dump(OS, 0, getDumpOpts());
return true;
}
}
} else if (Names.count(Name)) {
// Match full text.
Die.dump(OS, 0, getDumpOpts());
return true;
}
return false;
}
/// Print only DIEs that have a certain name.
static void filterByName(const StringSet<> &Names,
DWARFContext::unit_iterator_range CUs,
raw_ostream &OS) {
for (const auto &CU : CUs)
for (const auto &Entry : CU->dies()) {
DWARFDie Die = {CU.get(), &Entry};
if (const char *Name = Die.getName(DINameKind::ShortName))
if (filterByName(Names, Die, Name, OS))
continue;
if (const char *Name = Die.getName(DINameKind::LinkageName))
filterByName(Names, Die, Name, OS);
}
}
static void getDies(DWARFContext &DICtx, const AppleAcceleratorTable &Accel,
StringRef Name, SmallVectorImpl<DWARFDie> &Dies) {
for (const auto &Entry : Accel.equal_range(Name)) {
if (llvm::Optional<uint64_t> Off = Entry.getDIESectionOffset()) {
if (DWARFDie Die = DICtx.getDIEForOffset(*Off))
Dies.push_back(Die);
}
}
}
static DWARFDie toDie(const DWARFDebugNames::Entry &Entry,
DWARFContext &DICtx) {
llvm::Optional<uint64_t> CUOff = Entry.getCUOffset();
llvm::Optional<uint64_t> Off = Entry.getDIEUnitOffset();
if (!CUOff || !Off)
return DWARFDie();
DWARFCompileUnit *CU = DICtx.getCompileUnitForOffset(*CUOff);
if (!CU)
return DWARFDie();
if (llvm::Optional<uint64_t> DWOId = CU->getDWOId()) {
// This is a skeleton unit. Look up the DIE in the DWO unit.
CU = DICtx.getDWOCompileUnitForHash(*DWOId);
if (!CU)
return DWARFDie();
}
return CU->getDIEForOffset(CU->getOffset() + *Off);
}
static void getDies(DWARFContext &DICtx, const DWARFDebugNames &Accel,
StringRef Name, SmallVectorImpl<DWARFDie> &Dies) {
for (const auto &Entry : Accel.equal_range(Name)) {
if (DWARFDie Die = toDie(Entry, DICtx))
Dies.push_back(Die);
}
}
/// Print only DIEs that have a certain name.
static void filterByAccelName(ArrayRef<std::string> Names, DWARFContext &DICtx,
raw_ostream &OS) {
SmallVector<DWARFDie, 4> Dies;
for (const auto &Name : Names) {
getDies(DICtx, DICtx.getAppleNames(), Name, Dies);
getDies(DICtx, DICtx.getAppleTypes(), Name, Dies);
getDies(DICtx, DICtx.getAppleNamespaces(), Name, Dies);
getDies(DICtx, DICtx.getDebugNames(), Name, Dies);
}
llvm::sort(Dies);
Dies.erase(std::unique(Dies.begin(), Dies.end()), Dies.end());
for (DWARFDie Die : Dies)
Die.dump(OS, 0, getDumpOpts());
}
/// Handle the --lookup option and dump the DIEs and line info for the given
/// address.
static bool lookup(DWARFContext &DICtx, uint64_t Address, raw_ostream &OS) {
auto DIEsForAddr = DICtx.getDIEsForAddress(Lookup);
if (!DIEsForAddr)
return false;
DIDumpOptions DumpOpts = getDumpOpts();
DumpOpts.RecurseDepth = 0;
DIEsForAddr.CompileUnit->dump(OS, DumpOpts);
if (DIEsForAddr.FunctionDIE) {
DIEsForAddr.FunctionDIE.dump(OS, 2, DumpOpts);
if (DIEsForAddr.BlockDIE)
DIEsForAddr.BlockDIE.dump(OS, 4, DumpOpts);
}
if (DILineInfo LineInfo = DICtx.getLineInfoForAddress(Lookup))
LineInfo.dump(OS);
return true;
}
bool collectStatsForObjectFile(ObjectFile &Obj, DWARFContext &DICtx,
Twine Filename, raw_ostream &OS);
static bool dumpObjectFile(ObjectFile &Obj, DWARFContext &DICtx, Twine Filename,
raw_ostream &OS) {
logAllUnhandledErrors(DICtx.loadRegisterInfo(Obj), errs(),
Filename.str() + ": ");
// The UUID dump already contains all the same information.
if (!(DumpType & DIDT_UUID) || DumpType == DIDT_All)
OS << Filename << ":\tfile format " << Obj.getFileFormatName() << '\n';
// Handle the --lookup option.
if (Lookup)
return lookup(DICtx, Lookup, OS);
// Handle the --name option.
if (!Name.empty()) {
StringSet<> Names;
for (auto name : Name)
Names.insert((IgnoreCase && !UseRegex) ? StringRef(name).lower() : name);
filterByName(Names, DICtx.normal_units(), OS);
filterByName(Names, DICtx.dwo_units(), OS);
return true;
}
// Handle the --find option and lower it to --debug-info=<offset>.
if (!Find.empty()) {
filterByAccelName(Find, DICtx, OS);
return true;
}
// Dump the complete DWARF structure.
DICtx.dump(OS, getDumpOpts(), DumpOffsets);
return true;
}
static bool verifyObjectFile(ObjectFile &Obj, DWARFContext &DICtx,
Twine Filename, raw_ostream &OS) {
// Verify the DWARF and exit with non-zero exit status if verification
// fails.
raw_ostream &stream = Quiet ? nulls() : OS;
stream << "Verifying " << Filename.str() << ":\tfile format "
<< Obj.getFileFormatName() << "\n";
bool Result = DICtx.verify(stream, getDumpOpts());
if (Result)
stream << "No errors.\n";
else
stream << "Errors detected.\n";
return Result;
}
static bool handleBuffer(StringRef Filename, MemoryBufferRef Buffer,
HandlerFn HandleObj, raw_ostream &OS);
static bool handleArchive(StringRef Filename, Archive &Arch,
HandlerFn HandleObj, raw_ostream &OS) {
bool Result = true;
Error Err = Error::success();
for (auto Child : Arch.children(Err)) {
auto BuffOrErr = Child.getMemoryBufferRef();
error(Filename, errorToErrorCode(BuffOrErr.takeError()));
auto NameOrErr = Child.getName();
error(Filename, errorToErrorCode(NameOrErr.takeError()));
std::string Name = (Filename + "(" + NameOrErr.get() + ")").str();
Result &= handleBuffer(Name, BuffOrErr.get(), HandleObj, OS);
}
error(Filename, errorToErrorCode(std::move(Err)));
return Result;
}
static bool handleBuffer(StringRef Filename, MemoryBufferRef Buffer,
HandlerFn HandleObj, raw_ostream &OS) {
Expected<std::unique_ptr<Binary>> BinOrErr = object::createBinary(Buffer);
error(Filename, errorToErrorCode(BinOrErr.takeError()));
bool Result = true;
if (auto *Obj = dyn_cast<ObjectFile>(BinOrErr->get())) {
if (filterArch(*Obj)) {
std::unique_ptr<DWARFContext> DICtx = DWARFContext::create(*Obj);
Result = HandleObj(*Obj, *DICtx, Filename, OS);
}
}
else if (auto *Fat = dyn_cast<MachOUniversalBinary>(BinOrErr->get()))
for (auto &ObjForArch : Fat->objects()) {
std::string ObjName =
(Filename + "(" + ObjForArch.getArchFlagName() + ")").str();
if (auto MachOOrErr = ObjForArch.getAsObjectFile()) {
auto &Obj = **MachOOrErr;
if (filterArch(Obj)) {
std::unique_ptr<DWARFContext> DICtx = DWARFContext::create(Obj);
Result &= HandleObj(Obj, *DICtx, ObjName, OS);
}
continue;
} else
consumeError(MachOOrErr.takeError());
if (auto ArchiveOrErr = ObjForArch.getAsArchive()) {
error(ObjName, errorToErrorCode(ArchiveOrErr.takeError()));
Result &= handleArchive(ObjName, *ArchiveOrErr.get(), HandleObj, OS);
continue;
} else
consumeError(ArchiveOrErr.takeError());
}
else if (auto *Arch = dyn_cast<Archive>(BinOrErr->get()))
Result = handleArchive(Filename, *Arch, HandleObj, OS);
return Result;
}
static bool handleFile(StringRef Filename, HandlerFn HandleObj,
raw_ostream &OS) {
ErrorOr<std::unique_ptr<MemoryBuffer>> BuffOrErr =
MemoryBuffer::getFileOrSTDIN(Filename);
error(Filename, BuffOrErr.getError());
std::unique_ptr<MemoryBuffer> Buffer = std::move(BuffOrErr.get());
return handleBuffer(Filename, *Buffer, HandleObj, OS);
}
/// If the input path is a .dSYM bundle (as created by the dsymutil tool),
/// replace it with individual entries for each of the object files inside the
/// bundle otherwise return the input path.
static std::vector<std::string> expandBundle(const std::string &InputPath) {
std::vector<std::string> BundlePaths;
SmallString<256> BundlePath(InputPath);
// Normalize input path. This is necessary to accept `bundle.dSYM/`.
sys::path::remove_dots(BundlePath);
// Manually open up the bundle to avoid introducing additional dependencies.
if (sys::fs::is_directory(BundlePath) &&
sys::path::extension(BundlePath) == ".dSYM") {
std::error_code EC;
sys::path::append(BundlePath, "Contents", "Resources", "DWARF");
for (sys::fs::directory_iterator Dir(BundlePath, EC), DirEnd;
Dir != DirEnd && !EC; Dir.increment(EC)) {
const std::string &Path = Dir->path();
sys::fs::file_status Status;
EC = sys::fs::status(Path, Status);
error(Path, EC);
switch (Status.type()) {
case sys::fs::file_type::regular_file:
case sys::fs::file_type::symlink_file:
case sys::fs::file_type::type_unknown:
BundlePaths.push_back(Path);
break;
default: /*ignore*/;
}
}
error(BundlePath, EC);
}
if (!BundlePaths.size())
BundlePaths.push_back(InputPath);
return BundlePaths;
}
int main(int argc, char **argv) {
InitLLVM X(argc, argv);
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargetMCs();
HideUnrelatedOptions({&DwarfDumpCategory, &SectionCategory, &ColorCategory});
cl::ParseCommandLineOptions(
argc, argv,
"pretty-print DWARF debug information in object files"
" and debug info archives.\n");
if (Help) {
PrintHelpMessage(/*Hidden =*/false, /*Categorized =*/true);
return 0;
}
// FIXME: Audit interactions between these two options and make them
// compatible.
if (Diff && Verbose) {
WithColor::error() << "incompatible arguments: specifying both -diff and "
"-verbose is currently not supported";
return 0;
}
std::unique_ptr<ToolOutputFile> OutputFile;
if (!OutputFilename.empty()) {
std::error_code EC;
OutputFile = llvm::make_unique<ToolOutputFile>(OutputFilename, EC,
sys::fs::F_None);
error("Unable to open output file" + OutputFilename, EC);
// Don't remove output file if we exit with an error.
OutputFile->keep();
}
raw_ostream &OS = OutputFile ? OutputFile->os() : outs();
bool OffsetRequested = false;
// Defaults to dumping all sections, unless brief mode is specified in which
// case only the .debug_info section in dumped.
#define HANDLE_DWARF_SECTION(ENUM_NAME, ELF_NAME, CMDLINE_NAME) \
if (Dump##ENUM_NAME.IsRequested) { \
DumpType |= DIDT_##ENUM_NAME; \
if (Dump##ENUM_NAME.HasValue) { \
DumpOffsets[DIDT_ID_##ENUM_NAME] = Dump##ENUM_NAME.Val; \
OffsetRequested = true; \
} \
}
#include "llvm/BinaryFormat/Dwarf.def"
#undef HANDLE_DWARF_SECTION
if (DumpUUID)
DumpType |= DIDT_UUID;
if (DumpAll)
DumpType = DIDT_All;
if (DumpType == DIDT_Null) {
if (Verbose)
DumpType = DIDT_All;
else
DumpType = DIDT_DebugInfo;
}
// Unless dumping a specific DIE, default to --show-children.
if (!ShowChildren && !Verify && !OffsetRequested && Name.empty() && Find.empty())
ShowChildren = true;
// Defaults to a.out if no filenames specified.
if (InputFilenames.empty())
InputFilenames.push_back("a.out");
// Expand any .dSYM bundles to the individual object files contained therein.
std::vector<std::string> Objects;
for (const auto &F : InputFilenames) {
auto Objs = expandBundle(F);
Objects.insert(Objects.end(), Objs.begin(), Objs.end());
}
if (Verify) {
// If we encountered errors during verify, exit with a non-zero exit status.
if (!all_of(Objects, [&](std::string Object) {
return handleFile(Object, verifyObjectFile, OS);
}))
exit(1);
} else if (Statistics)
for (auto Object : Objects)
handleFile(Object, collectStatsForObjectFile, OS);
else
for (auto Object : Objects)
handleFile(Object, dumpObjectFile, OS);
return EXIT_SUCCESS;
}
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