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llvm-project/clang/lib/Driver/SanitizerArgs.cpp

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//===--- SanitizerArgs.cpp - Arguments for sanitizer tools ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "clang/Driver/SanitizerArgs.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/ToolChain.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SpecialCaseList.h"
#include <memory>
using namespace clang::driver;
using namespace llvm::opt;
namespace {
/// Assign ordinals to possible values of -fsanitize= flag.
/// We use the ordinal values as bit positions within \c SanitizeKind.
enum SanitizeOrdinal : uint64_t {
#define SANITIZER(NAME, ID) SO_##ID,
#define SANITIZER_GROUP(NAME, ID, ALIAS) SO_##ID##Group,
#include "clang/Basic/Sanitizers.def"
SO_Count
};
/// Represents a set of sanitizer kinds. It is also used to define:
/// 1) set of sanitizers each sanitizer group expands into.
/// 2) set of sanitizers sharing a specific property (e.g.
/// all sanitizers with zero-base shadow).
enum SanitizeKind : uint64_t {
#define SANITIZER(NAME, ID) ID = 1ULL << SO_##ID,
#define SANITIZER_GROUP(NAME, ID, ALIAS) \
ID = ALIAS, ID##Group = 1ULL << SO_##ID##Group,
#include "clang/Basic/Sanitizers.def"
NeedsUbsanRt = Undefined | Integer,
NotAllowedWithTrap = Vptr,
RequiresPIE = Memory | DataFlow,
NeedsUnwindTables = Address | Thread | Memory | DataFlow,
SupportsCoverage = Address | Memory | Leak | Undefined | Integer | DataFlow,
RecoverableByDefault = Undefined | Integer,
Unrecoverable = Address | Unreachable | Return,
LegacyFsanitizeRecoverMask = Undefined | Integer,
NeedsLTO = CFI,
};
}
/// Returns true if set of \p Sanitizers contain at least one sanitizer from
/// \p Kinds.
static bool hasOneOf(const clang::SanitizerSet &Sanitizers, uint64_t Kinds) {
#define SANITIZER(NAME, ID) \
if (Sanitizers.has(clang::SanitizerKind::ID) && (Kinds & ID)) \
return true;
#include "clang/Basic/Sanitizers.def"
return false;
}
/// Adds all sanitizers from \p Kinds to \p Sanitizers.
static void addAllOf(clang::SanitizerSet &Sanitizers, uint64_t Kinds) {
#define SANITIZER(NAME, ID) \
if (Kinds & ID) \
Sanitizers.set(clang::SanitizerKind::ID, true);
#include "clang/Basic/Sanitizers.def"
}
static uint64_t toSanitizeKind(clang::SanitizerKind K) {
#define SANITIZER(NAME, ID) \
if (K == clang::SanitizerKind::ID) \
return ID;
#include "clang/Basic/Sanitizers.def"
llvm_unreachable("Invalid SanitizerKind!");
}
/// Parse a single value from a -fsanitize= or -fno-sanitize= value list.
/// Returns a member of the \c SanitizeKind enumeration, or \c 0
/// if \p Value is not known.
static uint64_t parseValue(const char *Value);
/// Parse a -fsanitize= or -fno-sanitize= argument's values, diagnosing any
/// invalid components. Returns OR of members of \c SanitizeKind enumeration.
static uint64_t parseArgValues(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors);
/// Produce an argument string from ArgList \p Args, which shows how it
/// provides some sanitizer kind from \p Mask. For example, the argument list
/// "-fsanitize=thread,vptr -fsanitize=address" with mask \c NeedsUbsanRt
/// would produce "-fsanitize=vptr".
static std::string lastArgumentForMask(const Driver &D,
const llvm::opt::ArgList &Args,
uint64_t Mask);
static std::string lastArgumentForKind(const Driver &D,
const llvm::opt::ArgList &Args,
clang::SanitizerKind K) {
return lastArgumentForMask(D, Args, toSanitizeKind(K));
}
/// Produce an argument string from argument \p A, which shows how it provides
/// a value in \p Mask. For instance, the argument
/// "-fsanitize=address,alignment" with mask \c NeedsUbsanRt would produce
/// "-fsanitize=alignment".
static std::string describeSanitizeArg(const llvm::opt::Arg *A, uint64_t Mask);
/// Produce a string containing comma-separated names of sanitizers in \p
/// Sanitizers set.
static std::string toString(const clang::SanitizerSet &Sanitizers);
/// For each sanitizer group bit set in \p Kinds, set the bits for sanitizers
/// this group enables.
static uint64_t expandGroups(uint64_t Kinds);
static uint64_t getToolchainUnsupportedKinds(const ToolChain &TC) {
bool IsFreeBSD = TC.getTriple().getOS() == llvm::Triple::FreeBSD;
bool IsLinux = TC.getTriple().getOS() == llvm::Triple::Linux;
bool IsX86 = TC.getTriple().getArch() == llvm::Triple::x86;
bool IsX86_64 = TC.getTriple().getArch() == llvm::Triple::x86_64;
bool IsMIPS64 = TC.getTriple().getArch() == llvm::Triple::mips64 ||
TC.getTriple().getArch() == llvm::Triple::mips64el;
uint64_t Unsupported = 0;
if (!(IsLinux && (IsX86_64 || IsMIPS64))) {
Unsupported |= Memory | DataFlow;
}
if (!((IsLinux || IsFreeBSD) && (IsX86_64 || IsMIPS64))) {
Unsupported |= Thread;
}
if (!(IsLinux && (IsX86 || IsX86_64))) {
Unsupported |= Function;
}
return Unsupported;
}
static bool getDefaultBlacklist(const Driver &D, uint64_t Kinds,
std::string &BLPath) {
const char *BlacklistFile = nullptr;
if (Kinds & SanitizeKind::Address)
BlacklistFile = "asan_blacklist.txt";
else if (Kinds & SanitizeKind::Memory)
BlacklistFile = "msan_blacklist.txt";
else if (Kinds & SanitizeKind::Thread)
BlacklistFile = "tsan_blacklist.txt";
else if (Kinds & SanitizeKind::DataFlow)
BlacklistFile = "dfsan_abilist.txt";
if (BlacklistFile) {
clang::SmallString<64> Path(D.ResourceDir);
llvm::sys::path::append(Path, BlacklistFile);
BLPath = Path.str();
return true;
}
return false;
}
bool SanitizerArgs::needsUbsanRt() const {
return !UbsanTrapOnError && hasOneOf(Sanitizers, NeedsUbsanRt) &&
!Sanitizers.has(SanitizerKind::Address) &&
!Sanitizers.has(SanitizerKind::Memory) &&
!Sanitizers.has(SanitizerKind::Thread);
}
bool SanitizerArgs::requiresPIE() const {
return AsanZeroBaseShadow || hasOneOf(Sanitizers, RequiresPIE);
}
bool SanitizerArgs::needsUnwindTables() const {
return hasOneOf(Sanitizers, NeedsUnwindTables);
}
bool SanitizerArgs::needsLTO() const {
return hasOneOf(Sanitizers, NeedsLTO);
}
void SanitizerArgs::clear() {
Sanitizers.clear();
RecoverableSanitizers.clear();
BlacklistFiles.clear();
SanitizeCoverage = 0;
MsanTrackOrigins = 0;
AsanFieldPadding = 0;
AsanZeroBaseShadow = false;
UbsanTrapOnError = false;
AsanSharedRuntime = false;
LinkCXXRuntimes = false;
}
SanitizerArgs::SanitizerArgs(const ToolChain &TC,
const llvm::opt::ArgList &Args) {
clear();
uint64_t AllRemove = 0; // During the loop below, the accumulated set of
// sanitizers disabled by the current sanitizer
// argument or any argument after it.
uint64_t DiagnosedKinds = 0; // All Kinds we have diagnosed up to now.
// Used to deduplicate diagnostics.
uint64_t Kinds = 0;
uint64_t NotSupported = getToolchainUnsupportedKinds(TC);
ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();
const Driver &D = TC.getDriver();
for (ArgList::const_reverse_iterator I = Args.rbegin(), E = Args.rend();
I != E; ++I) {
const auto *Arg = *I;
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
Arg->claim();
uint64_t Add = parseArgValues(D, Arg, true);
// Avoid diagnosing any sanitizer which is disabled later.
Add &= ~AllRemove;
// At this point we have not expanded groups, so any unsupported
// sanitizers in Add are those which have been explicitly enabled.
// Diagnose them.
if (uint64_t KindsToDiagnose = Add & NotSupported & ~DiagnosedKinds) {
// Only diagnose the new kinds.
std::string Desc = describeSanitizeArg(*I, KindsToDiagnose);
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Desc << TC.getTriple().str();
DiagnosedKinds |= KindsToDiagnose;
}
Add &= ~NotSupported;
// Test for -fno-rtti + explicit -fsanitizer=vptr before expanding groups
// so we don't error out if -fno-rtti and -fsanitize=undefined were
// passed.
if (Add & SanitizeKind::Vptr &&
(RTTIMode == ToolChain::RM_DisabledImplicitly ||
RTTIMode == ToolChain::RM_DisabledExplicitly)) {
if (RTTIMode == ToolChain::RM_DisabledImplicitly)
// Warn about not having rtti enabled if the vptr sanitizer is
// explicitly enabled
D.Diag(diag::warn_drv_disabling_vptr_no_rtti_default);
else {
const llvm::opt::Arg *NoRTTIArg = TC.getRTTIArg();
assert(NoRTTIArg &&
"RTTI disabled explicitly but we have no argument!");
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize=vptr" << NoRTTIArg->getAsString(Args);
}
// Take out the Vptr sanitizer from the enabled sanitizers
AllRemove |= SanitizeKind::Vptr;
}
Add = expandGroups(Add);
// Group expansion may have enabled a sanitizer which is disabled later.
Add &= ~AllRemove;
// Silently discard any unsupported sanitizers implicitly enabled through
// group expansion.
Add &= ~NotSupported;
Kinds |= Add;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
Arg->claim();
uint64_t Remove = parseArgValues(D, Arg, true);
AllRemove |= expandGroups(Remove);
}
}
// We disable the vptr sanitizer if it was enabled by group expansion but RTTI
// is disabled.
if ((Kinds & SanitizeKind::Vptr) &&
(RTTIMode == ToolChain::RM_DisabledImplicitly ||
RTTIMode == ToolChain::RM_DisabledExplicitly)) {
Kinds &= ~SanitizeKind::Vptr;
}
// Warn about undefined sanitizer options that require runtime support.
UbsanTrapOnError =
Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
options::OPT_fno_sanitize_undefined_trap_on_error, false);
if (UbsanTrapOnError && (Kinds & SanitizeKind::NotAllowedWithTrap)) {
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< lastArgumentForMask(D, Args, NotAllowedWithTrap)
<< "-fsanitize-undefined-trap-on-error";
Kinds &= ~SanitizeKind::NotAllowedWithTrap;
}
// Warn about incompatible groups of sanitizers.
std::pair<uint64_t, uint64_t> IncompatibleGroups[] = {
std::make_pair(SanitizeKind::Address, SanitizeKind::Thread),
std::make_pair(SanitizeKind::Address, SanitizeKind::Memory),
std::make_pair(SanitizeKind::Thread, SanitizeKind::Memory),
std::make_pair(SanitizeKind::Leak, SanitizeKind::Thread),
std::make_pair(SanitizeKind::Leak, SanitizeKind::Memory)};
for (auto G : IncompatibleGroups) {
uint64_t Group = G.first;
if (Kinds & Group) {
if (uint64_t Incompatible = Kinds & G.second) {
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< lastArgumentForMask(D, Args, Group)
<< lastArgumentForMask(D, Args, Incompatible);
Kinds &= ~Incompatible;
}
}
}
// FIXME: Currently -fsanitize=leak is silently ignored in the presence of
// -fsanitize=address. Perhaps it should print an error, or perhaps
// -f(-no)sanitize=leak should change whether leak detection is enabled by
// default in ASan?
// Parse -f(no-)?sanitize-recover flags.
uint64_t RecoverableKinds = RecoverableByDefault;
uint64_t DiagnosedUnrecoverableKinds = 0;
for (const auto *Arg : Args) {
const char *DeprecatedReplacement = nullptr;
if (Arg->getOption().matches(options::OPT_fsanitize_recover)) {
DeprecatedReplacement = "-fsanitize-recover=undefined,integer";
RecoverableKinds |= expandGroups(LegacyFsanitizeRecoverMask);
Arg->claim();
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover)) {
DeprecatedReplacement = "-fno-sanitize-recover=undefined,integer";
RecoverableKinds &= ~expandGroups(LegacyFsanitizeRecoverMask);
Arg->claim();
} else if (Arg->getOption().matches(options::OPT_fsanitize_recover_EQ)) {
uint64_t Add = parseArgValues(D, Arg, true);
// Report error if user explicitly tries to recover from unrecoverable
// sanitizer.
if (uint64_t KindsToDiagnose =
Add & Unrecoverable & ~DiagnosedUnrecoverableKinds) {
SanitizerSet SetToDiagnose;
addAllOf(SetToDiagnose, KindsToDiagnose);
D.Diag(diag::err_drv_unsupported_option_argument)
<< Arg->getOption().getName() << toString(SetToDiagnose);
DiagnosedUnrecoverableKinds |= KindsToDiagnose;
}
RecoverableKinds |= expandGroups(Add);
Arg->claim();
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover_EQ)) {
RecoverableKinds &= ~expandGroups(parseArgValues(D, Arg, true));
Arg->claim();
}
if (DeprecatedReplacement) {
D.Diag(diag::warn_drv_deprecated_arg) << Arg->getAsString(Args)
<< DeprecatedReplacement;
}
}
RecoverableKinds &= Kinds;
RecoverableKinds &= ~Unrecoverable;
// Setup blacklist files.
// Add default blacklist from resource directory.
{
std::string BLPath;
if (getDefaultBlacklist(D, Kinds, BLPath) && llvm::sys::fs::exists(BLPath))
BlacklistFiles.push_back(BLPath);
}
// Parse -f(no-)sanitize-blacklist options.
for (const auto *Arg : Args) {
if (Arg->getOption().matches(options::OPT_fsanitize_blacklist)) {
Arg->claim();
std::string BLPath = Arg->getValue();
if (llvm::sys::fs::exists(BLPath))
BlacklistFiles.push_back(BLPath);
else
D.Diag(clang::diag::err_drv_no_such_file) << BLPath;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_blacklist)) {
Arg->claim();
BlacklistFiles.clear();
}
}
// Validate blacklists format.
{
std::string BLError;
std::unique_ptr<llvm::SpecialCaseList> SCL(
llvm::SpecialCaseList::create(BlacklistFiles, BLError));
if (!SCL.get())
D.Diag(clang::diag::err_drv_malformed_sanitizer_blacklist) << BLError;
}
// Parse -f[no-]sanitize-memory-track-origins[=level] options.
if (Kinds & SanitizeKind::Memory) {
if (Arg *A =
Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
options::OPT_fsanitize_memory_track_origins,
options::OPT_fno_sanitize_memory_track_origins)) {
if (A->getOption().matches(options::OPT_fsanitize_memory_track_origins)) {
MsanTrackOrigins = 2;
} else if (A->getOption().matches(
options::OPT_fno_sanitize_memory_track_origins)) {
MsanTrackOrigins = 0;
} else {
StringRef S = A->getValue();
if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
MsanTrackOrigins > 2) {
D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
}
}
}
}
// Parse -fsanitize-coverage=N. Currently one of asan/msan/lsan is required.
if (Kinds & SanitizeKind::SupportsCoverage) {
if (Arg *A = Args.getLastArg(options::OPT_fsanitize_coverage)) {
StringRef S = A->getValue();
// Legal values are 0..4.
if (S.getAsInteger(0, SanitizeCoverage) || SanitizeCoverage < 0 ||
SanitizeCoverage > 4)
D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
}
}
if (Kinds & SanitizeKind::Address) {
AsanSharedRuntime =
Args.hasArg(options::OPT_shared_libasan) ||
(TC.getTriple().getEnvironment() == llvm::Triple::Android);
AsanZeroBaseShadow =
(TC.getTriple().getEnvironment() == llvm::Triple::Android);
if (Arg *A =
Args.getLastArg(options::OPT_fsanitize_address_field_padding)) {
StringRef S = A->getValue();
// Legal values are 0 and 1, 2, but in future we may add more levels.
if (S.getAsInteger(0, AsanFieldPadding) || AsanFieldPadding < 0 ||
AsanFieldPadding > 2) {
D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
}
}
if (Arg *WindowsDebugRTArg =
Args.getLastArg(options::OPT__SLASH_MTd, options::OPT__SLASH_MT,
options::OPT__SLASH_MDd, options::OPT__SLASH_MD,
options::OPT__SLASH_LDd, options::OPT__SLASH_LD)) {
switch (WindowsDebugRTArg->getOption().getID()) {
case options::OPT__SLASH_MTd:
case options::OPT__SLASH_MDd:
case options::OPT__SLASH_LDd:
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< WindowsDebugRTArg->getAsString(Args)
<< lastArgumentForKind(D, Args, SanitizerKind::Address);
D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
}
}
}
// Parse -link-cxx-sanitizer flag.
LinkCXXRuntimes =
Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();
// Finally, initialize the set of available and recoverable sanitizers.
addAllOf(Sanitizers, Kinds);
addAllOf(RecoverableSanitizers, RecoverableKinds);
}
static std::string toString(const clang::SanitizerSet &Sanitizers) {
std::string Res;
#define SANITIZER(NAME, ID) \
if (Sanitizers.has(clang::SanitizerKind::ID)) { \
if (!Res.empty()) \
Res += ","; \
Res += NAME; \
}
#include "clang/Basic/Sanitizers.def"
return Res;
}
void SanitizerArgs::addArgs(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs) const {
if (Sanitizers.empty())
return;
CmdArgs.push_back(Args.MakeArgString("-fsanitize=" + toString(Sanitizers)));
if (!RecoverableSanitizers.empty())
CmdArgs.push_back(Args.MakeArgString("-fsanitize-recover=" +
toString(RecoverableSanitizers)));
if (UbsanTrapOnError)
CmdArgs.push_back("-fsanitize-undefined-trap-on-error");
for (const auto &BLPath : BlacklistFiles) {
SmallString<64> BlacklistOpt("-fsanitize-blacklist=");
BlacklistOpt += BLPath;
CmdArgs.push_back(Args.MakeArgString(BlacklistOpt));
}
if (MsanTrackOrigins)
CmdArgs.push_back(Args.MakeArgString("-fsanitize-memory-track-origins=" +
llvm::utostr(MsanTrackOrigins)));
if (AsanFieldPadding)
CmdArgs.push_back(Args.MakeArgString("-fsanitize-address-field-padding=" +
llvm::utostr(AsanFieldPadding)));
if (SanitizeCoverage)
CmdArgs.push_back(Args.MakeArgString("-fsanitize-coverage=" +
llvm::utostr(SanitizeCoverage)));
// MSan: Workaround for PR16386.
// ASan: This is mainly to help LSan with cases such as
// https://code.google.com/p/address-sanitizer/issues/detail?id=373
// We can't make this conditional on -fsanitize=leak, as that flag shouldn't
// affect compilation.
if (Sanitizers.has(SanitizerKind::Memory) ||
Sanitizers.has(SanitizerKind::Address))
CmdArgs.push_back(Args.MakeArgString("-fno-assume-sane-operator-new"));
}
uint64_t parseValue(const char *Value) {
uint64_t ParsedKind = llvm::StringSwitch<SanitizeKind>(Value)
#define SANITIZER(NAME, ID) .Case(NAME, ID)
#define SANITIZER_GROUP(NAME, ID, ALIAS) .Case(NAME, ID##Group)
#include "clang/Basic/Sanitizers.def"
.Default(SanitizeKind());
return ParsedKind;
}
uint64_t expandGroups(uint64_t Kinds) {
#define SANITIZER(NAME, ID)
#define SANITIZER_GROUP(NAME, ID, ALIAS) if (Kinds & ID##Group) Kinds |= ID;
#include "clang/Basic/Sanitizers.def"
return Kinds;
}
uint64_t parseArgValues(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors) {
assert((A->getOption().matches(options::OPT_fsanitize_EQ) ||
A->getOption().matches(options::OPT_fno_sanitize_EQ) ||
A->getOption().matches(options::OPT_fsanitize_recover_EQ) ||
A->getOption().matches(options::OPT_fno_sanitize_recover_EQ)) &&
"Invalid argument in parseArgValues!");
uint64_t Kinds = 0;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
uint64_t Kind;
// Special case: don't accept -fsanitize=all.
if (A->getOption().matches(options::OPT_fsanitize_EQ) &&
0 == strcmp("all", Value))
Kind = 0;
else
Kind = parseValue(Value);
if (Kind)
Kinds |= Kind;
else if (DiagnoseErrors)
D.Diag(clang::diag::err_drv_unsupported_option_argument)
<< A->getOption().getName() << Value;
}
return Kinds;
}
std::string lastArgumentForMask(const Driver &D, const llvm::opt::ArgList &Args,
uint64_t Mask) {
for (llvm::opt::ArgList::const_reverse_iterator I = Args.rbegin(),
E = Args.rend();
I != E; ++I) {
const auto *Arg = *I;
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
uint64_t AddKinds = expandGroups(parseArgValues(D, Arg, false));
if (AddKinds & Mask)
return describeSanitizeArg(Arg, Mask);
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
uint64_t RemoveKinds = expandGroups(parseArgValues(D, Arg, false));
Mask &= ~RemoveKinds;
}
}
llvm_unreachable("arg list didn't provide expected value");
}
std::string describeSanitizeArg(const llvm::opt::Arg *A, uint64_t Mask) {
assert(A->getOption().matches(options::OPT_fsanitize_EQ)
&& "Invalid argument in describeSanitizerArg!");
std::string Sanitizers;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
if (expandGroups(parseValue(A->getValue(i))) & Mask) {
if (!Sanitizers.empty())
Sanitizers += ",";
Sanitizers += A->getValue(i);
}
}
assert(!Sanitizers.empty() && "arg didn't provide expected value");
return "-fsanitize=" + Sanitizers;
}
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