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llvm-project/clang/lib/Driver/SanitizerArgs.cpp
Maxim Zhukov 2b7daaf967
[sanitizer][CFI] Add support to build CFI with sanitize-coverage (#131296) 
Added ability to build together with -fsanitize=cfi and
-fsanitize-coverage=trace-cmp at the same time.
2025-04-02 16:05:44 +03:00

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//===--- SanitizerArgs.cpp - Arguments for sanitizer tools ---------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "clang/Driver/SanitizerArgs.h"
#include "clang/Basic/Sanitizers.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/Options.h"
#include "clang/Driver/ToolChain.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/SpecialCaseList.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "llvm/TargetParser/AArch64TargetParser.h"
#include "llvm/TargetParser/RISCVTargetParser.h"
#include "llvm/TargetParser/TargetParser.h"
#include "llvm/Transforms/Instrumentation/AddressSanitizerOptions.h"
#include <memory>
using namespace clang;
using namespace clang::driver;
using namespace llvm::opt;
static const SanitizerMask NeedsUbsanRt =
SanitizerKind::Undefined | SanitizerKind::Integer |
SanitizerKind::LocalBounds | SanitizerKind::ImplicitConversion |
SanitizerKind::Nullability | SanitizerKind::CFI |
SanitizerKind::FloatDivideByZero | SanitizerKind::ObjCCast |
SanitizerKind::Vptr;
static const SanitizerMask NeedsUbsanCxxRt =
SanitizerKind::Vptr | SanitizerKind::CFI;
static const SanitizerMask NotAllowedWithTrap = SanitizerKind::Vptr;
static const SanitizerMask NotAllowedWithMinimalRuntime = SanitizerKind::Vptr;
static const SanitizerMask NotAllowedWithExecuteOnly =
SanitizerKind::Function | SanitizerKind::KCFI;
static const SanitizerMask NeedsUnwindTables =
SanitizerKind::Address | SanitizerKind::HWAddress | SanitizerKind::Type |
SanitizerKind::Thread | SanitizerKind::Memory | SanitizerKind::DataFlow |
SanitizerKind::NumericalStability;
static const SanitizerMask SupportsCoverage =
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::KernelAddress | SanitizerKind::KernelHWAddress |
SanitizerKind::Type | SanitizerKind::MemtagStack |
SanitizerKind::MemtagHeap | SanitizerKind::MemtagGlobals |
SanitizerKind::Memory | SanitizerKind::KernelMemory | SanitizerKind::Leak |
SanitizerKind::Undefined | SanitizerKind::Integer | SanitizerKind::Bounds |
SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
SanitizerKind::DataFlow | SanitizerKind::Fuzzer |
SanitizerKind::FuzzerNoLink | SanitizerKind::FloatDivideByZero |
SanitizerKind::SafeStack | SanitizerKind::ShadowCallStack |
SanitizerKind::Thread | SanitizerKind::ObjCCast | SanitizerKind::KCFI |
SanitizerKind::NumericalStability | SanitizerKind::Vptr |
SanitizerKind::CFI;
static const SanitizerMask RecoverableByDefault =
SanitizerKind::Undefined | SanitizerKind::Integer |
SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
SanitizerKind::FloatDivideByZero | SanitizerKind::ObjCCast |
SanitizerKind::Vptr;
static const SanitizerMask Unrecoverable =
SanitizerKind::Unreachable | SanitizerKind::Return;
static const SanitizerMask AlwaysRecoverable = SanitizerKind::KernelAddress |
SanitizerKind::KernelHWAddress |
SanitizerKind::KCFI;
static const SanitizerMask NeedsLTO = SanitizerKind::CFI;
static const SanitizerMask TrappingSupported =
SanitizerKind::Undefined | SanitizerKind::Integer |
SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
SanitizerKind::LocalBounds | SanitizerKind::CFI |
SanitizerKind::FloatDivideByZero | SanitizerKind::ObjCCast;
static const SanitizerMask MergeDefault =
SanitizerKind::Undefined | SanitizerKind::Vptr;
static const SanitizerMask TrappingDefault =
SanitizerKind::CFI | SanitizerKind::LocalBounds;
static const SanitizerMask CFIClasses =
SanitizerKind::CFIVCall | SanitizerKind::CFINVCall |
SanitizerKind::CFIMFCall | SanitizerKind::CFIDerivedCast |
SanitizerKind::CFIUnrelatedCast;
static const SanitizerMask CompatibleWithMinimalRuntime =
TrappingSupported | SanitizerKind::Scudo | SanitizerKind::ShadowCallStack |
SanitizerKind::MemtagStack | SanitizerKind::MemtagHeap |
SanitizerKind::MemtagGlobals | SanitizerKind::KCFI;
enum CoverageFeature {
CoverageFunc = 1 << 0,
CoverageBB = 1 << 1,
CoverageEdge = 1 << 2,
CoverageIndirCall = 1 << 3,
CoverageTraceBB = 1 << 4, // Deprecated.
CoverageTraceCmp = 1 << 5,
CoverageTraceDiv = 1 << 6,
CoverageTraceGep = 1 << 7,
Coverage8bitCounters = 1 << 8, // Deprecated.
CoverageTracePC = 1 << 9,
CoverageTracePCGuard = 1 << 10,
CoverageNoPrune = 1 << 11,
CoverageInline8bitCounters = 1 << 12,
CoveragePCTable = 1 << 13,
CoverageStackDepth = 1 << 14,
CoverageInlineBoolFlag = 1 << 15,
CoverageTraceLoads = 1 << 16,
CoverageTraceStores = 1 << 17,
CoverageControlFlow = 1 << 18,
};
enum BinaryMetadataFeature {
BinaryMetadataCovered = 1 << 0,
BinaryMetadataAtomics = 1 << 1,
BinaryMetadataUAR = 1 << 2,
};
/// Parse a -fsanitize= or -fno-sanitize= argument's values, diagnosing any
/// invalid components. Returns a SanitizerMask.
static SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors);
/// Parse a -fsanitize=<sanitizer1>=<value1>... or -fno-sanitize= argument's
/// values, diagnosing any invalid components.
/// Cutoffs are stored in the passed parameter.
static void parseArgCutoffs(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors, SanitizerMaskCutoffs &Cutoffs);
/// Parse -f(no-)?sanitize-coverage= flag values, diagnosing any invalid
/// components. Returns OR of members of \c CoverageFeature enumeration.
static int parseCoverageFeatures(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors);
/// Parse -fsanitize-undefined-ignore-overflow-pattern= flag values, diagnosing
/// any invalid values. Returns a mask of excluded overflow patterns.
static int parseOverflowPatternExclusionValues(const Driver &D,
const llvm::opt::Arg *A,
bool DiagnoseErrors);
/// Parse -f(no-)?sanitize-metadata= flag values, diagnosing any invalid
/// components. Returns OR of members of \c BinaryMetadataFeature enumeration.
static int parseBinaryMetadataFeatures(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,
SanitizerMask Mask);
/// 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,
SanitizerMask Mask);
/// Produce a string containing comma-separated names of sanitizers in \p
/// Sanitizers set.
static std::string toString(const clang::SanitizerSet &Sanitizers);
/// Return true if an execute-only target disallows data access to code
/// sections.
static bool isExecuteOnlyTarget(const llvm::Triple &Triple,
const llvm::opt::ArgList &Args) {
if (Triple.isPS5())
return true;
return Args.hasFlagNoClaim(options::OPT_mexecute_only,
options::OPT_mno_execute_only, false);
}
static void validateSpecialCaseListFormat(const Driver &D,
std::vector<std::string> &SCLFiles,
unsigned MalformedSCLErrorDiagID,
bool DiagnoseErrors) {
if (SCLFiles.empty())
return;
std::string BLError;
std::unique_ptr<llvm::SpecialCaseList> SCL(
llvm::SpecialCaseList::create(SCLFiles, D.getVFS(), BLError));
if (!SCL.get() && DiagnoseErrors)
D.Diag(MalformedSCLErrorDiagID) << BLError;
}
static void addDefaultIgnorelists(const Driver &D, SanitizerMask Kinds,
std::vector<std::string> &IgnorelistFiles,
bool DiagnoseErrors) {
struct Ignorelist {
const char *File;
SanitizerMask Mask;
} Ignorelists[] = {{"asan_ignorelist.txt", SanitizerKind::Address},
{"hwasan_ignorelist.txt", SanitizerKind::HWAddress},
{"memtag_ignorelist.txt", SanitizerKind::MemTag},
{"msan_ignorelist.txt", SanitizerKind::Memory},
{"nsan_ignorelist.txt", SanitizerKind::NumericalStability},
{"tsan_ignorelist.txt", SanitizerKind::Thread},
{"tysan_blacklist.txt", SanitizerKind::Type},
{"dfsan_abilist.txt", SanitizerKind::DataFlow},
{"cfi_ignorelist.txt", SanitizerKind::CFI},
{"ubsan_ignorelist.txt",
SanitizerKind::Undefined | SanitizerKind::Vptr |
SanitizerKind::Integer | SanitizerKind::Nullability |
SanitizerKind::FloatDivideByZero}};
for (auto BL : Ignorelists) {
if (!(Kinds & BL.Mask))
continue;
clang::SmallString<64> Path(D.ResourceDir);
llvm::sys::path::append(Path, "share", BL.File);
if (D.getVFS().exists(Path))
IgnorelistFiles.push_back(std::string(Path));
else if (BL.Mask == SanitizerKind::CFI && DiagnoseErrors)
// If cfi_ignorelist.txt cannot be found in the resource dir, driver
// should fail.
D.Diag(clang::diag::err_drv_missing_sanitizer_ignorelist) << Path;
}
validateSpecialCaseListFormat(
D, IgnorelistFiles, clang::diag::err_drv_malformed_sanitizer_ignorelist,
DiagnoseErrors);
}
/// Parse -f(no-)?sanitize-(coverage-)?(allow|ignore)list argument's values,
/// diagnosing any invalid file paths and validating special case list format.
static void parseSpecialCaseListArg(const Driver &D,
const llvm::opt::ArgList &Args,
std::vector<std::string> &SCLFiles,
llvm::opt::OptSpecifier SCLOptionID,
llvm::opt::OptSpecifier NoSCLOptionID,
unsigned MalformedSCLErrorDiagID,
bool DiagnoseErrors) {
for (const auto *Arg : Args) {
// Match -fsanitize-(coverage-)?(allow|ignore)list.
if (Arg->getOption().matches(SCLOptionID)) {
Arg->claim();
std::string SCLPath = Arg->getValue();
if (D.getVFS().exists(SCLPath)) {
SCLFiles.push_back(SCLPath);
} else if (DiagnoseErrors) {
D.Diag(clang::diag::err_drv_no_such_file) << SCLPath;
}
// Match -fno-sanitize-ignorelist.
} else if (Arg->getOption().matches(NoSCLOptionID)) {
Arg->claim();
SCLFiles.clear();
}
}
validateSpecialCaseListFormat(D, SCLFiles, MalformedSCLErrorDiagID,
DiagnoseErrors);
}
/// Sets group bits for every group that has at least one representative already
/// enabled in \p Kinds.
static SanitizerMask setGroupBits(SanitizerMask Kinds) {
#define SANITIZER(NAME, ID)
#define SANITIZER_GROUP(NAME, ID, ALIAS) \
if (Kinds & SanitizerKind::ID) \
Kinds |= SanitizerKind::ID##Group;
#include "clang/Basic/Sanitizers.def"
return Kinds;
}
// Computes the sanitizer mask as:
// Default + Arguments (in or out)
// with arguments parsed from left to right.
//
// Error messages are printed if the AlwaysIn or AlwaysOut invariants are
// violated, but the caller must enforce these invariants themselves.
static SanitizerMask
parseSanitizeArgs(const Driver &D, const llvm::opt::ArgList &Args,
bool DiagnoseErrors, SanitizerMask Default,
SanitizerMask AlwaysIn, SanitizerMask AlwaysOut, int OptInID,
int OptOutID) {
assert(!(AlwaysIn & AlwaysOut) &&
"parseSanitizeArgs called with contradictory in/out requirements");
SanitizerMask Output = Default;
// Keep track of which violations we have already reported, to avoid
// duplicate error messages.
SanitizerMask DiagnosedAlwaysInViolations;
SanitizerMask DiagnosedAlwaysOutViolations;
for (const auto *Arg : Args) {
if (Arg->getOption().matches(OptInID)) {
SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
// Report error if user explicitly tries to opt-in to an always-out
// sanitizer.
if (SanitizerMask KindsToDiagnose =
Add & AlwaysOut & ~DiagnosedAlwaysOutViolations) {
if (DiagnoseErrors) {
SanitizerSet SetToDiagnose;
SetToDiagnose.Mask |= KindsToDiagnose;
D.Diag(diag::err_drv_unsupported_option_argument)
<< Arg->getSpelling() << toString(SetToDiagnose);
DiagnosedAlwaysOutViolations |= KindsToDiagnose;
}
}
Output |= expandSanitizerGroups(Add);
Arg->claim();
} else if (Arg->getOption().matches(OptOutID)) {
SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
// Report error if user explicitly tries to opt-out of an always-in
// sanitizer.
if (SanitizerMask KindsToDiagnose =
Remove & AlwaysIn & ~DiagnosedAlwaysInViolations) {
if (DiagnoseErrors) {
SanitizerSet SetToDiagnose;
SetToDiagnose.Mask |= KindsToDiagnose;
D.Diag(diag::err_drv_unsupported_option_argument)
<< Arg->getSpelling() << toString(SetToDiagnose);
DiagnosedAlwaysInViolations |= KindsToDiagnose;
}
}
Output &= ~expandSanitizerGroups(Remove);
Arg->claim();
}
}
return Output;
}
static SanitizerMask parseSanitizeTrapArgs(const Driver &D,
const llvm::opt::ArgList &Args,
bool DiagnoseErrors) {
SanitizerMask AlwaysTrap; // Empty
SanitizerMask NeverTrap = ~(setGroupBits(TrappingSupported));
// N.B. We do *not* enforce NeverTrap. This maintains the behavior of
// '-fsanitize=undefined -fsanitize-trap=undefined'
// (clang/test/Driver/fsanitize.c ), which is that vptr is not enabled at all
// (not even in recover mode) in order to avoid the need for a ubsan runtime.
return parseSanitizeArgs(D, Args, DiagnoseErrors, TrappingDefault, AlwaysTrap,
NeverTrap, options::OPT_fsanitize_trap_EQ,
options::OPT_fno_sanitize_trap_EQ);
}
static SanitizerMaskCutoffs
parseSanitizeSkipHotCutoffArgs(const Driver &D, const llvm::opt::ArgList &Args,
bool DiagnoseErrors) {
SanitizerMaskCutoffs Cutoffs;
for (const auto *Arg : Args)
if (Arg->getOption().matches(options::OPT_fsanitize_skip_hot_cutoff_EQ)) {
Arg->claim();
parseArgCutoffs(D, Arg, DiagnoseErrors, Cutoffs);
}
return Cutoffs;
}
bool SanitizerArgs::needsFuzzerInterceptors() const {
return needsFuzzer() && !needsAsanRt() && !needsTsanRt() && !needsMsanRt();
}
bool SanitizerArgs::needsUbsanRt() const {
// All of these include ubsan.
if (needsAsanRt() || needsMsanRt() || needsNsanRt() || needsHwasanRt() ||
needsTsanRt() || needsDfsanRt() || needsLsanRt() || needsCfiDiagRt() ||
(needsScudoRt() && !requiresMinimalRuntime()))
return false;
return (Sanitizers.Mask & NeedsUbsanRt & ~TrapSanitizers.Mask) ||
CoverageFeatures;
}
bool SanitizerArgs::needsUbsanCXXRt() const {
// Link UBSAN C++ runtime very selectively, as it's needed in only very
// specific cases, but forces the program to depend on C++ ABI. UBSAN C++
// runtime is not included with other sanitizers.
return static_cast<bool>(Sanitizers.Mask & NeedsUbsanCxxRt &
~TrapSanitizers.Mask);
}
bool SanitizerArgs::needsCfiRt() const {
return !(Sanitizers.Mask & SanitizerKind::CFI & ~TrapSanitizers.Mask) &&
CfiCrossDso && !ImplicitCfiRuntime;
}
bool SanitizerArgs::needsCfiDiagRt() const {
return (Sanitizers.Mask & SanitizerKind::CFI & ~TrapSanitizers.Mask) &&
CfiCrossDso && !ImplicitCfiRuntime;
}
bool SanitizerArgs::requiresPIE() const { return NeedPIE; }
bool SanitizerArgs::needsUnwindTables() const {
return static_cast<bool>(Sanitizers.Mask & NeedsUnwindTables);
}
bool SanitizerArgs::needsLTO() const {
return static_cast<bool>(Sanitizers.Mask & NeedsLTO);
}
SanitizerArgs::SanitizerArgs(const ToolChain &TC,
const llvm::opt::ArgList &Args,
bool DiagnoseErrors) {
SanitizerMask AllRemove; // During the loop below, the accumulated set of
// sanitizers disabled by the current sanitizer
// argument or any argument after it.
SanitizerMask AllAddedKinds; // Mask of all sanitizers ever enabled by
// -fsanitize= flags (directly or via group
// expansion), some of which may be disabled
// later. Used to carefully prune
// unused-argument diagnostics.
SanitizerMask DiagnosedKinds; // All Kinds we have diagnosed up to now.
// Used to deduplicate diagnostics.
SanitizerMask Kinds;
const SanitizerMask Supported = setGroupBits(TC.getSupportedSanitizers());
CfiCrossDso = Args.hasFlag(options::OPT_fsanitize_cfi_cross_dso,
options::OPT_fno_sanitize_cfi_cross_dso, false);
ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();
const Driver &D = TC.getDriver();
SanitizerMask TrappingKinds = parseSanitizeTrapArgs(D, Args, DiagnoseErrors);
SanitizerMask InvalidTrappingKinds = TrappingKinds & NotAllowedWithTrap;
MinimalRuntime =
Args.hasFlag(options::OPT_fsanitize_minimal_runtime,
options::OPT_fno_sanitize_minimal_runtime, MinimalRuntime);
// The object size sanitizer should not be enabled at -O0.
Arg *OptLevel = Args.getLastArg(options::OPT_O_Group);
bool RemoveObjectSizeAtO0 =
!OptLevel || OptLevel->getOption().matches(options::OPT_O0);
for (const llvm::opt::Arg *Arg : llvm::reverse(Args)) {
if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
Arg->claim();
SanitizerMask Add = parseArgValues(D, Arg, DiagnoseErrors);
if (RemoveObjectSizeAtO0) {
AllRemove |= SanitizerKind::ObjectSize;
// The user explicitly enabled the object size sanitizer. Warn
// that this does nothing at -O0.
if ((Add & SanitizerKind::ObjectSize) && DiagnoseErrors)
D.Diag(diag::warn_drv_object_size_disabled_O0)
<< Arg->getAsString(Args);
}
AllAddedKinds |= expandSanitizerGroups(Add);
// 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 (SanitizerMask KindsToDiagnose =
Add & InvalidTrappingKinds & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
D.Diag(diag::err_drv_argument_not_allowed_with)
<< Desc << "-fsanitize-trap=undefined";
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= ~InvalidTrappingKinds;
if (MinimalRuntime) {
if (SanitizerMask KindsToDiagnose =
Add & NotAllowedWithMinimalRuntime & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
D.Diag(diag::err_drv_argument_not_allowed_with)
<< Desc << "-fsanitize-minimal-runtime";
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= ~NotAllowedWithMinimalRuntime;
}
if (llvm::opt::Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
StringRef CM = A->getValue();
if (CM != "small" &&
(Add & SanitizerKind::Function & ~DiagnosedKinds)) {
if (DiagnoseErrors)
D.Diag(diag::err_drv_argument_only_allowed_with)
<< "-fsanitize=function"
<< "-mcmodel=small";
Add &= ~SanitizerKind::Function;
DiagnosedKinds |= SanitizerKind::Function;
}
}
// -fsanitize=function and -fsanitize=kcfi instrument indirect function
// calls to load a type hash before the function label. Therefore, an
// execute-only target doesn't support the function and kcfi sanitizers.
const llvm::Triple &Triple = TC.getTriple();
if (isExecuteOnlyTarget(Triple, Args)) {
if (SanitizerMask KindsToDiagnose =
Add & NotAllowedWithExecuteOnly & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
llvm::opt::Arg *A = Args.getLastArgNoClaim(
options::OPT_mexecute_only, options::OPT_mno_execute_only);
if (A && A->getOption().matches(options::OPT_mexecute_only))
D.Diag(diag::err_drv_argument_not_allowed_with)
<< Desc << A->getAsString(Args);
else
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Desc << Triple.str();
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= ~NotAllowedWithExecuteOnly;
}
// FIXME: Make CFI on member function calls compatible with cross-DSO CFI.
// There are currently two problems:
// - Virtual function call checks need to pass a pointer to the function
// address to llvm.type.test and a pointer to the address point to the
// diagnostic function. Currently we pass the same pointer to both
// places.
// - Non-virtual function call checks may need to check multiple type
// identifiers.
// Fixing both of those may require changes to the cross-DSO CFI
// interface.
if (CfiCrossDso && (Add & SanitizerKind::CFIMFCall & ~DiagnosedKinds)) {
if (DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize=cfi-mfcall"
<< "-fsanitize-cfi-cross-dso";
Add &= ~SanitizerKind::CFIMFCall;
DiagnosedKinds |= SanitizerKind::CFIMFCall;
}
if (SanitizerMask KindsToDiagnose = Add & ~Supported & ~DiagnosedKinds) {
if (DiagnoseErrors) {
std::string Desc = describeSanitizeArg(Arg, KindsToDiagnose);
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< Desc << TC.getTriple().str();
}
DiagnosedKinds |= KindsToDiagnose;
}
Add &= Supported;
// 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 & SanitizerKind::Vptr) && (RTTIMode == ToolChain::RM_Disabled)) {
if (const llvm::opt::Arg *NoRTTIArg = TC.getRTTIArg()) {
assert(NoRTTIArg->getOption().matches(options::OPT_fno_rtti) &&
"RTTI disabled without -fno-rtti option?");
// The user explicitly passed -fno-rtti with -fsanitize=vptr, but
// the vptr sanitizer requires RTTI, so this is a user error.
if (DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize=vptr" << NoRTTIArg->getAsString(Args);
} else {
// The vptr sanitizer requires RTTI, but RTTI is disabled (by
// default). Warn that the vptr sanitizer is being disabled.
if (DiagnoseErrors)
D.Diag(diag::warn_drv_disabling_vptr_no_rtti_default);
}
// Take out the Vptr sanitizer from the enabled sanitizers
AllRemove |= SanitizerKind::Vptr;
}
Add = expandSanitizerGroups(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 &= ~InvalidTrappingKinds;
if (MinimalRuntime) {
Add &= ~NotAllowedWithMinimalRuntime;
}
// NotAllowedWithExecuteOnly is silently discarded on an execute-only
// target if implicitly enabled through group expansion.
if (isExecuteOnlyTarget(Triple, Args))
Add &= ~NotAllowedWithExecuteOnly;
if (CfiCrossDso)
Add &= ~SanitizerKind::CFIMFCall;
// -fsanitize=undefined does not expand to signed-integer-overflow in
// -fwrapv (implied by -fno-strict-overflow) mode.
if (Add & SanitizerKind::UndefinedGroup) {
bool S = Args.hasFlagNoClaim(options::OPT_fno_strict_overflow,
options::OPT_fstrict_overflow, false);
if (Args.hasFlagNoClaim(options::OPT_fwrapv, options::OPT_fno_wrapv, S))
Add &= ~SanitizerKind::SignedIntegerOverflow;
if (Args.hasFlagNoClaim(options::OPT_fwrapv_pointer,
options::OPT_fno_wrapv_pointer, S))
Add &= ~SanitizerKind::PointerOverflow;
}
Add &= Supported;
if (Add & SanitizerKind::Fuzzer)
Add |= SanitizerKind::FuzzerNoLink;
// Enable coverage if the fuzzing flag is set.
if (Add & SanitizerKind::FuzzerNoLink) {
CoverageFeatures |= CoverageInline8bitCounters | CoverageIndirCall |
CoverageTraceCmp | CoveragePCTable;
// Due to TLS differences, stack depth tracking is only enabled on Linux
if (TC.getTriple().isOSLinux())
CoverageFeatures |= CoverageStackDepth;
}
Kinds |= Add;
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
Arg->claim();
SanitizerMask Remove = parseArgValues(D, Arg, DiagnoseErrors);
AllRemove |= expandSanitizerGroups(Remove);
}
}
std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
std::make_pair(SanitizerKind::Address,
SanitizerKind::Thread | SanitizerKind::Memory),
std::make_pair(SanitizerKind::Type,
SanitizerKind::Address | SanitizerKind::KernelAddress |
SanitizerKind::Memory | SanitizerKind::Leak |
SanitizerKind::Thread | SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::Thread, SanitizerKind::Memory),
std::make_pair(SanitizerKind::Leak,
SanitizerKind::Thread | SanitizerKind::Memory),
std::make_pair(SanitizerKind::KernelAddress,
SanitizerKind::Address | SanitizerKind::Leak |
SanitizerKind::Thread | SanitizerKind::Memory),
std::make_pair(SanitizerKind::HWAddress,
SanitizerKind::Address | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::Scudo,
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Leak | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::SafeStack,
(TC.getTriple().isOSFuchsia() ? SanitizerMask()
: SanitizerKind::Leak) |
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Thread | SanitizerKind::Memory |
SanitizerKind::KernelAddress),
std::make_pair(SanitizerKind::KernelHWAddress,
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Leak | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress |
SanitizerKind::SafeStack),
std::make_pair(SanitizerKind::KernelMemory,
SanitizerKind::Address | SanitizerKind::HWAddress |
SanitizerKind::Leak | SanitizerKind::Thread |
SanitizerKind::Memory | SanitizerKind::KernelAddress |
SanitizerKind::Scudo | SanitizerKind::SafeStack),
std::make_pair(SanitizerKind::MemTag, SanitizerKind::Address |
SanitizerKind::KernelAddress |
SanitizerKind::HWAddress |
SanitizerKind::KernelHWAddress),
std::make_pair(SanitizerKind::KCFI, SanitizerKind::Function),
std::make_pair(SanitizerKind::Realtime,
SanitizerKind::Address | SanitizerKind::Thread |
SanitizerKind::Undefined | SanitizerKind::Memory)};
// Enable toolchain specific default sanitizers if not explicitly disabled.
SanitizerMask Default = TC.getDefaultSanitizers() & ~AllRemove;
// Disable default sanitizers that are incompatible with explicitly requested
// ones.
for (auto G : IncompatibleGroups) {
SanitizerMask Group = G.first;
if ((Default & Group) && (Kinds & G.second))
Default &= ~Group;
}
Kinds |= Default;
// We disable the vptr sanitizer if it was enabled by group expansion but RTTI
// is disabled.
if ((Kinds & SanitizerKind::Vptr) && (RTTIMode == ToolChain::RM_Disabled)) {
Kinds &= ~SanitizerKind::Vptr;
}
// Check that LTO is enabled if we need it.
if ((Kinds & NeedsLTO) && !D.isUsingLTO() && DiagnoseErrors) {
D.Diag(diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(D, Args, Kinds & NeedsLTO) << "-flto";
}
if ((Kinds & SanitizerKind::ShadowCallStack) && TC.getTriple().isAArch64() &&
!llvm::AArch64::isX18ReservedByDefault(TC.getTriple()) &&
!Args.hasArg(options::OPT_ffixed_x18) && DiagnoseErrors) {
D.Diag(diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(D, Args, Kinds & SanitizerKind::ShadowCallStack)
<< "-ffixed-x18";
}
// Report error if there are non-trapping sanitizers that require
// c++abi-specific parts of UBSan runtime, and they are not provided by the
// toolchain. We don't have a good way to check the latter, so we just
// check if the toolchan supports vptr.
if (~Supported & SanitizerKind::Vptr) {
SanitizerMask KindsToDiagnose = Kinds & ~TrappingKinds & NeedsUbsanCxxRt;
// The runtime library supports the Microsoft C++ ABI, but only well enough
// for CFI. FIXME: Remove this once we support vptr on Windows.
if (TC.getTriple().isOSWindows())
KindsToDiagnose &= ~SanitizerKind::CFI;
if (KindsToDiagnose) {
SanitizerSet S;
S.Mask = KindsToDiagnose;
if (DiagnoseErrors)
D.Diag(diag::err_drv_unsupported_opt_for_target)
<< ("-fno-sanitize-trap=" + toString(S)) << TC.getTriple().str();
Kinds &= ~KindsToDiagnose;
}
}
// Warn about incompatible groups of sanitizers.
for (auto G : IncompatibleGroups) {
SanitizerMask Group = G.first;
if (Kinds & Group) {
if (SanitizerMask Incompatible = Kinds & G.second) {
if (DiagnoseErrors)
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.
SanitizerMask RecoverableKinds = parseSanitizeArgs(
D, Args, DiagnoseErrors, RecoverableByDefault, AlwaysRecoverable,
Unrecoverable, options::OPT_fsanitize_recover_EQ,
options::OPT_fno_sanitize_recover_EQ);
RecoverableKinds |= AlwaysRecoverable;
RecoverableKinds &= ~Unrecoverable;
RecoverableKinds &= Kinds;
TrappingKinds &= Kinds;
RecoverableKinds &= ~TrappingKinds;
// Parse -f(no-)?sanitize-nonmerged-handlers flags
SanitizerMask MergeKinds =
parseSanitizeArgs(D, Args, DiagnoseErrors, MergeDefault, {}, {},
options::OPT_fsanitize_merge_handlers_EQ,
options::OPT_fno_sanitize_merge_handlers_EQ);
MergeKinds &= Kinds;
// Parse -fno-sanitize-top-hot flags
SkipHotCutoffs = parseSanitizeSkipHotCutoffArgs(D, Args, DiagnoseErrors);
// Setup ignorelist files.
// Add default ignorelist from resource directory for activated sanitizers,
// and validate special case lists format.
if (!Args.hasArgNoClaim(options::OPT_fno_sanitize_ignorelist))
addDefaultIgnorelists(D, Kinds, SystemIgnorelistFiles, DiagnoseErrors);
// Parse -f(no-)?sanitize-ignorelist options.
// This also validates special case lists format.
parseSpecialCaseListArg(
D, Args, UserIgnorelistFiles, options::OPT_fsanitize_ignorelist_EQ,
options::OPT_fno_sanitize_ignorelist,
clang::diag::err_drv_malformed_sanitizer_ignorelist, DiagnoseErrors);
// Parse -f[no-]sanitize-memory-track-origins[=level] options.
if (AllAddedKinds & SanitizerKind::Memory) {
if (Arg *A =
Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
options::OPT_fno_sanitize_memory_track_origins)) {
if (!A->getOption().matches(
options::OPT_fno_sanitize_memory_track_origins)) {
StringRef S = A->getValue();
if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
MsanTrackOrigins > 2) {
if (DiagnoseErrors)
D.Diag(clang::diag::err_drv_invalid_value)
<< A->getAsString(Args) << S;
}
}
}
MsanUseAfterDtor = Args.hasFlag(
options::OPT_fsanitize_memory_use_after_dtor,
options::OPT_fno_sanitize_memory_use_after_dtor, MsanUseAfterDtor);
MsanParamRetval = Args.hasFlag(
options::OPT_fsanitize_memory_param_retval,
options::OPT_fno_sanitize_memory_param_retval, MsanParamRetval);
} else if (AllAddedKinds & SanitizerKind::KernelMemory) {
MsanUseAfterDtor = false;
MsanParamRetval = Args.hasFlag(
options::OPT_fsanitize_memory_param_retval,
options::OPT_fno_sanitize_memory_param_retval, MsanParamRetval);
} else {
MsanUseAfterDtor = false;
MsanParamRetval = false;
}
if (AllAddedKinds & SanitizerKind::MemTag) {
StringRef S =
Args.getLastArgValue(options::OPT_fsanitize_memtag_mode_EQ, "sync");
if (S == "async" || S == "sync") {
MemtagMode = S.str();
} else {
D.Diag(clang::diag::err_drv_invalid_value_with_suggestion)
<< "-fsanitize-memtag-mode=" << S << "{async, sync}";
MemtagMode = "sync";
}
}
if (AllAddedKinds & SanitizerKind::Thread) {
TsanMemoryAccess = Args.hasFlag(
options::OPT_fsanitize_thread_memory_access,
options::OPT_fno_sanitize_thread_memory_access, TsanMemoryAccess);
TsanFuncEntryExit = Args.hasFlag(
options::OPT_fsanitize_thread_func_entry_exit,
options::OPT_fno_sanitize_thread_func_entry_exit, TsanFuncEntryExit);
TsanAtomics =
Args.hasFlag(options::OPT_fsanitize_thread_atomics,
options::OPT_fno_sanitize_thread_atomics, TsanAtomics);
}
if (AllAddedKinds & SanitizerKind::CFI) {
// Without PIE, external function address may resolve to a PLT record, which
// can not be verified by the target module.
NeedPIE |= CfiCrossDso;
CfiICallGeneralizePointers =
Args.hasArg(options::OPT_fsanitize_cfi_icall_generalize_pointers);
CfiICallNormalizeIntegers =
Args.hasArg(options::OPT_fsanitize_cfi_icall_normalize_integers);
if (CfiCrossDso && CfiICallGeneralizePointers && DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-cfi-cross-dso"
<< "-fsanitize-cfi-icall-generalize-pointers";
CfiCanonicalJumpTables =
Args.hasFlag(options::OPT_fsanitize_cfi_canonical_jump_tables,
options::OPT_fno_sanitize_cfi_canonical_jump_tables, true);
}
if (AllAddedKinds & SanitizerKind::KCFI) {
CfiICallNormalizeIntegers =
Args.hasArg(options::OPT_fsanitize_cfi_icall_normalize_integers);
KcfiArity = Args.hasArg(options::OPT_fsanitize_kcfi_arity);
if (AllAddedKinds & SanitizerKind::CFI && DiagnoseErrors)
D.Diag(diag::err_drv_argument_not_allowed_with)
<< "-fsanitize=kcfi"
<< lastArgumentForMask(D, Args, SanitizerKind::CFI);
}
Stats = Args.hasFlag(options::OPT_fsanitize_stats,
options::OPT_fno_sanitize_stats, false);
if (MinimalRuntime) {
SanitizerMask IncompatibleMask =
Kinds & ~setGroupBits(CompatibleWithMinimalRuntime);
if (IncompatibleMask && DiagnoseErrors)
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-minimal-runtime"
<< lastArgumentForMask(D, Args, IncompatibleMask);
SanitizerMask NonTrappingCfi = Kinds & SanitizerKind::CFI & ~TrappingKinds;
if (NonTrappingCfi && DiagnoseErrors)
D.Diag(clang::diag::err_drv_argument_only_allowed_with)
<< "fsanitize-minimal-runtime"
<< "fsanitize-trap=cfi";
}
for (const auto *Arg : Args.filtered(
options::OPT_fsanitize_undefined_ignore_overflow_pattern_EQ)) {
Arg->claim();
OverflowPatternExclusions |=
parseOverflowPatternExclusionValues(D, Arg, DiagnoseErrors);
}
// Parse -f(no-)?sanitize-coverage flags if coverage is supported by the
// enabled sanitizers.
for (const auto *Arg : Args) {
if (Arg->getOption().matches(options::OPT_fsanitize_coverage)) {
int LegacySanitizeCoverage;
if (Arg->getNumValues() == 1 &&
!StringRef(Arg->getValue(0))
.getAsInteger(0, LegacySanitizeCoverage)) {
CoverageFeatures = 0;
Arg->claim();
if (LegacySanitizeCoverage != 0 && DiagnoseErrors) {
D.Diag(diag::warn_drv_deprecated_arg)
<< Arg->getAsString(Args) << /*hasReplacement=*/true
<< "-fsanitize-coverage=trace-pc-guard";
}
continue;
}
CoverageFeatures |= parseCoverageFeatures(D, Arg, DiagnoseErrors);
// Disable coverage and not claim the flags if there is at least one
// non-supporting sanitizer.
if (!(AllAddedKinds & ~AllRemove & ~setGroupBits(SupportsCoverage))) {
Arg->claim();
} else {
CoverageFeatures = 0;
}
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_coverage)) {
Arg->claim();
CoverageFeatures &= ~parseCoverageFeatures(D, Arg, DiagnoseErrors);
}
}
// Choose at most one coverage type: function, bb, or edge.
if (DiagnoseErrors) {
if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageBB))
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-coverage=func"
<< "-fsanitize-coverage=bb";
if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageEdge))
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-coverage=func"
<< "-fsanitize-coverage=edge";
if ((CoverageFeatures & CoverageBB) && (CoverageFeatures & CoverageEdge))
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< "-fsanitize-coverage=bb"
<< "-fsanitize-coverage=edge";
// Basic block tracing and 8-bit counters require some type of coverage
// enabled.
if (CoverageFeatures & CoverageTraceBB)
D.Diag(clang::diag::warn_drv_deprecated_arg)
<< "-fsanitize-coverage=trace-bb" << /*hasReplacement=*/true
<< "-fsanitize-coverage=trace-pc-guard";
if (CoverageFeatures & Coverage8bitCounters)
D.Diag(clang::diag::warn_drv_deprecated_arg)
<< "-fsanitize-coverage=8bit-counters" << /*hasReplacement=*/true
<< "-fsanitize-coverage=trace-pc-guard";
}
int InsertionPointTypes = CoverageFunc | CoverageBB | CoverageEdge;
int InstrumentationTypes = CoverageTracePC | CoverageTracePCGuard |
CoverageInline8bitCounters | CoverageTraceLoads |
CoverageTraceStores | CoverageInlineBoolFlag |
CoverageControlFlow;
if ((CoverageFeatures & InsertionPointTypes) &&
!(CoverageFeatures & InstrumentationTypes) && DiagnoseErrors) {
D.Diag(clang::diag::warn_drv_deprecated_arg)
<< "-fsanitize-coverage=[func|bb|edge]" << /*hasReplacement=*/true
<< "-fsanitize-coverage=[func|bb|edge],[trace-pc-guard|trace-pc],["
"control-flow]";
}
// trace-pc w/o func/bb/edge implies edge.
if (!(CoverageFeatures & InsertionPointTypes)) {
if (CoverageFeatures &
(CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters |
CoverageInlineBoolFlag | CoverageControlFlow))
CoverageFeatures |= CoverageEdge;
if (CoverageFeatures & CoverageStackDepth)
CoverageFeatures |= CoverageFunc;
}
// Parse -fsanitize-coverage-(allow|ignore)list options if coverage enabled.
// This also validates special case lists format.
// Here, OptSpecifier() acts as a never-matching command-line argument.
// So, there is no way to clear coverage lists but you can append to them.
if (CoverageFeatures) {
parseSpecialCaseListArg(
D, Args, CoverageAllowlistFiles,
options::OPT_fsanitize_coverage_allowlist, OptSpecifier(),
clang::diag::err_drv_malformed_sanitizer_coverage_allowlist,
DiagnoseErrors);
parseSpecialCaseListArg(
D, Args, CoverageIgnorelistFiles,
options::OPT_fsanitize_coverage_ignorelist, OptSpecifier(),
clang::diag::err_drv_malformed_sanitizer_coverage_ignorelist,
DiagnoseErrors);
}
// Parse -f(no-)?sanitize-metadata.
for (const auto *Arg :
Args.filtered(options::OPT_fexperimental_sanitize_metadata_EQ,
options::OPT_fno_experimental_sanitize_metadata_EQ)) {
if (Arg->getOption().matches(
options::OPT_fexperimental_sanitize_metadata_EQ)) {
Arg->claim();
BinaryMetadataFeatures |=
parseBinaryMetadataFeatures(D, Arg, DiagnoseErrors);
} else {
Arg->claim();
BinaryMetadataFeatures &=
~parseBinaryMetadataFeatures(D, Arg, DiagnoseErrors);
}
}
// Parse -fsanitize-metadata-ignorelist option if enabled.
if (BinaryMetadataFeatures) {
parseSpecialCaseListArg(
D, Args, BinaryMetadataIgnorelistFiles,
options::OPT_fexperimental_sanitize_metadata_ignorelist_EQ,
OptSpecifier(), // Cannot clear ignore list, only append.
clang::diag::err_drv_malformed_sanitizer_metadata_ignorelist,
DiagnoseErrors);
}
SharedRuntime = Args.hasFlag(
options::OPT_shared_libsan, options::OPT_static_libsan,
TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia() ||
TC.getTriple().isOSDarwin() || TC.getTriple().isOSWindows());
if (!SharedRuntime && TC.getTriple().isOSWindows()) {
Arg *A =
Args.getLastArg(options::OPT_shared_libsan, options::OPT_static_libsan);
D.Diag(clang::diag::err_drv_unsupported_opt_for_target)
<< A->getSpelling() << TC.getTriple().str();
}
ImplicitCfiRuntime = TC.getTriple().isAndroid();
if (AllAddedKinds & SanitizerKind::Address) {
NeedPIE |= TC.getTriple().isOSFuchsia();
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) &&
DiagnoseErrors) {
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:
if (DiagnoseErrors) {
D.Diag(clang::diag::err_drv_argument_not_allowed_with)
<< WindowsDebugRTArg->getAsString(Args)
<< lastArgumentForMask(D, Args, SanitizerKind::Address);
D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
}
}
}
StableABI = Args.hasFlag(options::OPT_fsanitize_stable_abi,
options::OPT_fno_sanitize_stable_abi, false);
AsanUseAfterScope = Args.hasFlag(
options::OPT_fsanitize_address_use_after_scope,
options::OPT_fno_sanitize_address_use_after_scope, AsanUseAfterScope);
AsanPoisonCustomArrayCookie = Args.hasFlag(
options::OPT_fsanitize_address_poison_custom_array_cookie,
options::OPT_fno_sanitize_address_poison_custom_array_cookie,
AsanPoisonCustomArrayCookie);
AsanOutlineInstrumentation =
Args.hasFlag(options::OPT_fsanitize_address_outline_instrumentation,
options::OPT_fno_sanitize_address_outline_instrumentation,
AsanOutlineInstrumentation);
AsanGlobalsDeadStripping = Args.hasFlag(
options::OPT_fsanitize_address_globals_dead_stripping,
options::OPT_fno_sanitize_address_globals_dead_stripping, true);
// Enable ODR indicators which allow better handling of mixed instrumented
// and uninstrumented globals. Disable them for Windows where weak odr
// indicators (.weak.__odr_asan_gen*) may cause multiple definition linker
// errors in the absence of -lldmingw.
AsanUseOdrIndicator =
Args.hasFlag(options::OPT_fsanitize_address_use_odr_indicator,
options::OPT_fno_sanitize_address_use_odr_indicator,
!TC.getTriple().isOSWindows());
if (AllAddedKinds & SanitizerKind::PointerCompare & ~AllRemove) {
AsanInvalidPointerCmp = true;
}
if (AllAddedKinds & SanitizerKind::PointerSubtract & ~AllRemove) {
AsanInvalidPointerSub = true;
}
if (TC.getTriple().isOSDarwin() &&
(Args.hasArg(options::OPT_mkernel) ||
Args.hasArg(options::OPT_fapple_kext))) {
AsanDtorKind = llvm::AsanDtorKind::None;
}
if (const auto *Arg =
Args.getLastArg(options::OPT_sanitize_address_destructor_EQ)) {
auto parsedAsanDtorKind = AsanDtorKindFromString(Arg->getValue());
if (parsedAsanDtorKind == llvm::AsanDtorKind::Invalid && DiagnoseErrors) {
TC.getDriver().Diag(clang::diag::err_drv_unsupported_option_argument)
<< Arg->getSpelling() << Arg->getValue();
}
AsanDtorKind = parsedAsanDtorKind;
}
if (const auto *Arg = Args.getLastArg(
options::OPT_sanitize_address_use_after_return_EQ)) {
auto parsedAsanUseAfterReturn =
AsanDetectStackUseAfterReturnModeFromString(Arg->getValue());
if (parsedAsanUseAfterReturn ==
llvm::AsanDetectStackUseAfterReturnMode::Invalid &&
DiagnoseErrors) {
TC.getDriver().Diag(clang::diag::err_drv_unsupported_option_argument)
<< Arg->getSpelling() << Arg->getValue();
}
AsanUseAfterReturn = parsedAsanUseAfterReturn;
}
} else {
AsanUseAfterScope = false;
// -fsanitize=pointer-compare/pointer-subtract requires -fsanitize=address.
SanitizerMask DetectInvalidPointerPairs =
SanitizerKind::PointerCompare | SanitizerKind::PointerSubtract;
if ((AllAddedKinds & DetectInvalidPointerPairs & ~AllRemove) &&
DiagnoseErrors) {
TC.getDriver().Diag(clang::diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(D, Args,
SanitizerKind::PointerCompare |
SanitizerKind::PointerSubtract)
<< "-fsanitize=address";
}
}
if (AllAddedKinds & SanitizerKind::HWAddress) {
if (Arg *HwasanAbiArg =
Args.getLastArg(options::OPT_fsanitize_hwaddress_abi_EQ)) {
HwasanAbi = HwasanAbiArg->getValue();
if (HwasanAbi != "platform" && HwasanAbi != "interceptor" &&
DiagnoseErrors)
D.Diag(clang::diag::err_drv_invalid_value)
<< HwasanAbiArg->getAsString(Args) << HwasanAbi;
} else {
HwasanAbi = "interceptor";
}
if (TC.getTriple().getArch() == llvm::Triple::x86_64)
HwasanUseAliases = Args.hasFlag(
options::OPT_fsanitize_hwaddress_experimental_aliasing,
options::OPT_fno_sanitize_hwaddress_experimental_aliasing,
HwasanUseAliases);
}
if (AllAddedKinds & SanitizerKind::SafeStack) {
// SafeStack runtime is built into the system on Android and Fuchsia.
SafeStackRuntime =
!TC.getTriple().isAndroid() && !TC.getTriple().isOSFuchsia();
}
LinkRuntimes =
Args.hasFlag(options::OPT_fsanitize_link_runtime,
options::OPT_fno_sanitize_link_runtime, LinkRuntimes);
// Parse -link-cxx-sanitizer flag.
LinkCXXRuntimes = D.CCCIsCXX();
LinkCXXRuntimes =
Args.hasFlag(options::OPT_fsanitize_link_cxx_runtime,
options::OPT_fno_sanitize_link_cxx_runtime, LinkCXXRuntimes);
NeedsMemProfRt = Args.hasFlag(options::OPT_fmemory_profile,
options::OPT_fmemory_profile_EQ,
options::OPT_fno_memory_profile, false);
// Finally, initialize the set of available and recoverable sanitizers.
Sanitizers.Mask |= Kinds;
RecoverableSanitizers.Mask |= RecoverableKinds;
TrapSanitizers.Mask |= TrappingKinds;
assert(!(RecoverableKinds & TrappingKinds) &&
"Overlap between recoverable and trapping sanitizers");
MergeHandlers.Mask |= MergeKinds;
// Zero out SkipHotCutoffs for unused sanitizers
SkipHotCutoffs.clear(~Sanitizers.Mask);
}
static std::string toString(const clang::SanitizerSet &Sanitizers) {
std::string Res;
#define SANITIZER(NAME, ID) \
if (Sanitizers.has(SanitizerKind::ID)) { \
if (!Res.empty()) \
Res += ","; \
Res += NAME; \
}
#include "clang/Basic/Sanitizers.def"
return Res;
}
static std::string toString(const clang::SanitizerMaskCutoffs &Cutoffs) {
llvm::SmallVector<std::string, 4> Res;
serializeSanitizerMaskCutoffs(Cutoffs, Res);
return llvm::join(Res, ",");
}
static void addSpecialCaseListOpt(const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
const char *SCLOptFlag,
const std::vector<std::string> &SCLFiles) {
for (const auto &SCLPath : SCLFiles) {
SmallString<64> SCLOpt(SCLOptFlag);
SCLOpt += SCLPath;
CmdArgs.push_back(Args.MakeArgString(SCLOpt));
}
}
static void addIncludeLinkerOption(const ToolChain &TC,
const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
StringRef SymbolName) {
SmallString<64> LinkerOptionFlag;
LinkerOptionFlag = "--linker-option=/include:";
if (TC.getTriple().getArch() == llvm::Triple::x86) {
// Win32 mangles C function names with a '_' prefix.
LinkerOptionFlag += '_';
}
LinkerOptionFlag += SymbolName;
CmdArgs.push_back(Args.MakeArgString(LinkerOptionFlag));
}
static bool hasTargetFeatureMTE(const llvm::opt::ArgStringList &CmdArgs) {
for (auto Start = CmdArgs.begin(), End = CmdArgs.end(); Start != End;
++Start) {
auto It = std::find(Start, End, StringRef("+mte"));
if (It == End)
break;
if (It > Start && *std::prev(It) == StringRef("-target-feature"))
return true;
Start = It;
}
return false;
}
void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
llvm::opt::ArgStringList &CmdArgs,
types::ID InputType) const {
// NVPTX doesn't currently support sanitizers. Bailing out here means
// that e.g. -fsanitize=address applies only to host code, which is what we
// want for now.
if (TC.getTriple().isNVPTX())
return;
// AMDGPU sanitizer support is experimental and controlled by -fgpu-sanitize.
bool GPUSanitize = false;
if (TC.getTriple().isAMDGPU()) {
if (!Args.hasFlag(options::OPT_fgpu_sanitize, options::OPT_fno_gpu_sanitize,
true))
return;
GPUSanitize = true;
}
// Translate available CoverageFeatures to corresponding clang-cc1 flags.
// Do it even if Sanitizers.empty() since some forms of coverage don't require
// sanitizers.
std::pair<int, const char *> CoverageFlags[] = {
std::make_pair(CoverageFunc, "-fsanitize-coverage-type=1"),
std::make_pair(CoverageBB, "-fsanitize-coverage-type=2"),
std::make_pair(CoverageEdge, "-fsanitize-coverage-type=3"),
std::make_pair(CoverageIndirCall, "-fsanitize-coverage-indirect-calls"),
std::make_pair(CoverageTraceBB, "-fsanitize-coverage-trace-bb"),
std::make_pair(CoverageTraceCmp, "-fsanitize-coverage-trace-cmp"),
std::make_pair(CoverageTraceDiv, "-fsanitize-coverage-trace-div"),
std::make_pair(CoverageTraceGep, "-fsanitize-coverage-trace-gep"),
std::make_pair(Coverage8bitCounters, "-fsanitize-coverage-8bit-counters"),
std::make_pair(CoverageTracePC, "-fsanitize-coverage-trace-pc"),
std::make_pair(CoverageTracePCGuard,
"-fsanitize-coverage-trace-pc-guard"),
std::make_pair(CoverageInline8bitCounters,
"-fsanitize-coverage-inline-8bit-counters"),
std::make_pair(CoverageInlineBoolFlag,
"-fsanitize-coverage-inline-bool-flag"),
std::make_pair(CoveragePCTable, "-fsanitize-coverage-pc-table"),
std::make_pair(CoverageNoPrune, "-fsanitize-coverage-no-prune"),
std::make_pair(CoverageStackDepth, "-fsanitize-coverage-stack-depth"),
std::make_pair(CoverageTraceLoads, "-fsanitize-coverage-trace-loads"),
std::make_pair(CoverageTraceStores, "-fsanitize-coverage-trace-stores"),
std::make_pair(CoverageControlFlow, "-fsanitize-coverage-control-flow")};
for (auto F : CoverageFlags) {
if (CoverageFeatures & F.first)
CmdArgs.push_back(F.second);
}
addSpecialCaseListOpt(
Args, CmdArgs, "-fsanitize-coverage-allowlist=", CoverageAllowlistFiles);
addSpecialCaseListOpt(Args, CmdArgs, "-fsanitize-coverage-ignorelist=",
CoverageIgnorelistFiles);
if (!GPUSanitize) {
// Translate available BinaryMetadataFeatures to corresponding clang-cc1
// flags. Does not depend on any other sanitizers. Unsupported on GPUs.
const std::pair<int, std::string> BinaryMetadataFlags[] = {
std::make_pair(BinaryMetadataCovered, "covered"),
std::make_pair(BinaryMetadataAtomics, "atomics"),
std::make_pair(BinaryMetadataUAR, "uar")};
for (const auto &F : BinaryMetadataFlags) {
if (BinaryMetadataFeatures & F.first)
CmdArgs.push_back(
Args.MakeArgString("-fexperimental-sanitize-metadata=" + F.second));
}
addSpecialCaseListOpt(Args, CmdArgs,
"-fexperimental-sanitize-metadata-ignorelist=",
BinaryMetadataIgnorelistFiles);
}
if (TC.getTriple().isOSWindows() && needsUbsanRt() &&
Args.hasFlag(options::OPT_frtlib_defaultlib,
options::OPT_fno_rtlib_defaultlib, true)) {
// Instruct the code generator to embed linker directives in the object file
// that cause the required runtime libraries to be linked.
CmdArgs.push_back(
Args.MakeArgString("--dependent-lib=" +
TC.getCompilerRTBasename(Args, "ubsan_standalone")));
if (types::isCXX(InputType))
CmdArgs.push_back(Args.MakeArgString(
"--dependent-lib=" +
TC.getCompilerRTBasename(Args, "ubsan_standalone_cxx")));
}
if (TC.getTriple().isOSWindows() && needsStatsRt() &&
Args.hasFlag(options::OPT_frtlib_defaultlib,
options::OPT_fno_rtlib_defaultlib, true)) {
CmdArgs.push_back(Args.MakeArgString(
"--dependent-lib=" + TC.getCompilerRTBasename(Args, "stats_client")));
// The main executable must export the stats runtime.
// FIXME: Only exporting from the main executable (e.g. based on whether the
// translation unit defines main()) would save a little space, but having
// multiple copies of the runtime shouldn't hurt.
CmdArgs.push_back(Args.MakeArgString(
"--dependent-lib=" + TC.getCompilerRTBasename(Args, "stats")));
addIncludeLinkerOption(TC, Args, CmdArgs, "__sanitizer_stats_register");
}
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 (!TrapSanitizers.empty())
CmdArgs.push_back(
Args.MakeArgString("-fsanitize-trap=" + toString(TrapSanitizers)));
if (!MergeHandlers.empty())
CmdArgs.push_back(
Args.MakeArgString("-fsanitize-merge=" + toString(MergeHandlers)));
std::string SkipHotCutoffsStr = toString(SkipHotCutoffs);
if (!SkipHotCutoffsStr.empty())
CmdArgs.push_back(
Args.MakeArgString("-fsanitize-skip-hot-cutoff=" + SkipHotCutoffsStr));
addSpecialCaseListOpt(Args, CmdArgs,
"-fsanitize-ignorelist=", UserIgnorelistFiles);
addSpecialCaseListOpt(Args, CmdArgs,
"-fsanitize-system-ignorelist=", SystemIgnorelistFiles);
if (OverflowPatternExclusions)
Args.AddAllArgs(
CmdArgs, options::OPT_fsanitize_undefined_ignore_overflow_pattern_EQ);
if (MsanTrackOrigins)
CmdArgs.push_back(Args.MakeArgString("-fsanitize-memory-track-origins=" +
Twine(MsanTrackOrigins)));
if (MsanUseAfterDtor)
CmdArgs.push_back("-fsanitize-memory-use-after-dtor");
if (!MsanParamRetval)
CmdArgs.push_back("-fno-sanitize-memory-param-retval");
// FIXME: Pass these parameters as function attributes, not as -llvm flags.
if (!TsanMemoryAccess) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-tsan-instrument-memory-accesses=0");
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-tsan-instrument-memintrinsics=0");
}
if (!TsanFuncEntryExit) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-tsan-instrument-func-entry-exit=0");
}
if (!TsanAtomics) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-tsan-instrument-atomics=0");
}
if (HwasanUseAliases) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-hwasan-experimental-use-page-aliases=1");
}
if (CfiCrossDso)
CmdArgs.push_back("-fsanitize-cfi-cross-dso");
if (CfiICallGeneralizePointers)
CmdArgs.push_back("-fsanitize-cfi-icall-generalize-pointers");
if (CfiICallNormalizeIntegers)
CmdArgs.push_back("-fsanitize-cfi-icall-experimental-normalize-integers");
if (KcfiArity) {
if (!TC.getTriple().isOSLinux() || !TC.getTriple().isArch64Bit()) {
TC.getDriver().Diag(clang::diag::err_drv_kcfi_arity_unsupported_target)
<< TC.getTriple().str();
}
CmdArgs.push_back("-fsanitize-kcfi-arity");
}
if (CfiCanonicalJumpTables)
CmdArgs.push_back("-fsanitize-cfi-canonical-jump-tables");
if (Stats)
CmdArgs.push_back("-fsanitize-stats");
if (MinimalRuntime)
CmdArgs.push_back("-fsanitize-minimal-runtime");
if (AsanFieldPadding)
CmdArgs.push_back(Args.MakeArgString("-fsanitize-address-field-padding=" +
Twine(AsanFieldPadding)));
if (AsanUseAfterScope)
CmdArgs.push_back("-fsanitize-address-use-after-scope");
if (AsanPoisonCustomArrayCookie)
CmdArgs.push_back("-fsanitize-address-poison-custom-array-cookie");
if (AsanGlobalsDeadStripping)
CmdArgs.push_back("-fsanitize-address-globals-dead-stripping");
if (!AsanUseOdrIndicator)
CmdArgs.push_back("-fno-sanitize-address-use-odr-indicator");
if (AsanInvalidPointerCmp) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-asan-detect-invalid-pointer-cmp");
}
if (AsanInvalidPointerSub) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-asan-detect-invalid-pointer-sub");
}
if (AsanOutlineInstrumentation) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-asan-instrumentation-with-call-threshold=0");
}
// When emitting Stable ABI instrumentation, force outlining calls and avoid
// inlining shadow memory poisoning. While this is a big performance burden
// for now it allows full abstraction from implementation details.
if (StableABI) {
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-asan-instrumentation-with-call-threshold=0");
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-asan-max-inline-poisoning-size=0");
CmdArgs.push_back("-mllvm");
CmdArgs.push_back("-asan-guard-against-version-mismatch=0");
}
// Only pass the option to the frontend if the user requested,
// otherwise the frontend will just use the codegen default.
if (AsanDtorKind != llvm::AsanDtorKind::Invalid) {
CmdArgs.push_back(Args.MakeArgString("-fsanitize-address-destructor=" +
AsanDtorKindToString(AsanDtorKind)));
}
if (AsanUseAfterReturn != llvm::AsanDetectStackUseAfterReturnMode::Invalid) {
CmdArgs.push_back(Args.MakeArgString(
"-fsanitize-address-use-after-return=" +
AsanDetectStackUseAfterReturnModeToString(AsanUseAfterReturn)));
}
if (!HwasanAbi.empty()) {
CmdArgs.push_back("-default-function-attr");
CmdArgs.push_back(Args.MakeArgString("hwasan-abi=" + HwasanAbi));
}
if (Sanitizers.has(SanitizerKind::HWAddress) && !HwasanUseAliases) {
CmdArgs.push_back("-target-feature");
CmdArgs.push_back("+tagged-globals");
}
// MSan: Workaround for PR16386.
// ASan: This is mainly to help LSan with cases such as
// https://github.com/google/sanitizers/issues/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("-fno-assume-sane-operator-new");
// libFuzzer wants to intercept calls to certain library functions, so the
// following -fno-builtin-* flags force the compiler to emit interposable
// libcalls to these functions. Other sanitizers effectively do the same thing
// by marking all library call sites with NoBuiltin attribute in their LLVM
// pass. (see llvm::maybeMarkSanitizerLibraryCallNoBuiltin)
if (Sanitizers.has(SanitizerKind::FuzzerNoLink)) {
CmdArgs.push_back("-fno-builtin-bcmp");
CmdArgs.push_back("-fno-builtin-memcmp");
CmdArgs.push_back("-fno-builtin-strncmp");
CmdArgs.push_back("-fno-builtin-strcmp");
CmdArgs.push_back("-fno-builtin-strncasecmp");
CmdArgs.push_back("-fno-builtin-strcasecmp");
CmdArgs.push_back("-fno-builtin-strstr");
CmdArgs.push_back("-fno-builtin-strcasestr");
CmdArgs.push_back("-fno-builtin-memmem");
}
// Require -fvisibility= flag on non-Windows when compiling if vptr CFI is
// enabled.
if (Sanitizers.hasOneOf(CFIClasses) && !TC.getTriple().isOSWindows() &&
!Args.hasArg(options::OPT_fvisibility_EQ)) {
TC.getDriver().Diag(clang::diag::err_drv_argument_only_allowed_with)
<< lastArgumentForMask(TC.getDriver(), Args,
Sanitizers.Mask & CFIClasses)
<< "-fvisibility=";
}
if (Sanitizers.has(SanitizerKind::MemtagStack) &&
!hasTargetFeatureMTE(CmdArgs))
TC.getDriver().Diag(diag::err_stack_tagging_requires_hardware_feature);
}
SanitizerMask 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) ||
A->getOption().matches(options::OPT_fsanitize_trap_EQ) ||
A->getOption().matches(options::OPT_fno_sanitize_trap_EQ) ||
A->getOption().matches(options::OPT_fsanitize_merge_handlers_EQ) ||
A->getOption().matches(options::OPT_fno_sanitize_merge_handlers_EQ)) &&
"Invalid argument in parseArgValues!");
SanitizerMask Kinds;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
SanitizerMask Kind;
// Special case: don't accept -fsanitize=all.
if (A->getOption().matches(options::OPT_fsanitize_EQ) &&
0 == strcmp("all", Value))
Kind = SanitizerMask();
else
Kind = parseSanitizerValue(Value, /*AllowGroups=*/true);
if (Kind)
Kinds |= Kind;
else if (DiagnoseErrors)
D.Diag(clang::diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << Value;
}
return Kinds;
}
void parseArgCutoffs(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors, SanitizerMaskCutoffs &Cutoffs) {
assert(A->getOption().matches(options::OPT_fsanitize_skip_hot_cutoff_EQ) &&
"Invalid argument in parseArgCutoffs!");
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
// We don't check the value of Cutoffs[i]: it's legal to specify
// a cutoff of 0.
if (!parseSanitizerWeightedValue(Value, /*AllowGroups=*/true, Cutoffs) &&
DiagnoseErrors)
D.Diag(clang::diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << Value;
}
}
static int parseOverflowPatternExclusionValues(const Driver &D,
const llvm::opt::Arg *A,
bool DiagnoseErrors) {
int Exclusions = 0;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
int E =
llvm::StringSwitch<int>(Value)
.Case("none", LangOptionsBase::None)
.Case("all", LangOptionsBase::All)
.Case("add-unsigned-overflow-test",
LangOptionsBase::AddUnsignedOverflowTest)
.Case("add-signed-overflow-test",
LangOptionsBase::AddSignedOverflowTest)
.Case("negated-unsigned-const", LangOptionsBase::NegUnsignedConst)
.Case("unsigned-post-decr-while", LangOptionsBase::PostDecrInWhile)
.Default(0);
if (E == 0)
D.Diag(clang::diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << Value;
Exclusions |= E;
}
return Exclusions;
}
int parseCoverageFeatures(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors) {
assert(A->getOption().matches(options::OPT_fsanitize_coverage) ||
A->getOption().matches(options::OPT_fno_sanitize_coverage));
int Features = 0;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
int F = llvm::StringSwitch<int>(Value)
.Case("func", CoverageFunc)
.Case("bb", CoverageBB)
.Case("edge", CoverageEdge)
.Case("indirect-calls", CoverageIndirCall)
.Case("trace-bb", CoverageTraceBB)
.Case("trace-cmp", CoverageTraceCmp)
.Case("trace-div", CoverageTraceDiv)
.Case("trace-gep", CoverageTraceGep)
.Case("8bit-counters", Coverage8bitCounters)
.Case("trace-pc", CoverageTracePC)
.Case("trace-pc-guard", CoverageTracePCGuard)
.Case("no-prune", CoverageNoPrune)
.Case("inline-8bit-counters", CoverageInline8bitCounters)
.Case("inline-bool-flag", CoverageInlineBoolFlag)
.Case("pc-table", CoveragePCTable)
.Case("stack-depth", CoverageStackDepth)
.Case("trace-loads", CoverageTraceLoads)
.Case("trace-stores", CoverageTraceStores)
.Case("control-flow", CoverageControlFlow)
.Default(0);
if (F == 0 && DiagnoseErrors)
D.Diag(clang::diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << Value;
Features |= F;
}
return Features;
}
int parseBinaryMetadataFeatures(const Driver &D, const llvm::opt::Arg *A,
bool DiagnoseErrors) {
assert(
A->getOption().matches(options::OPT_fexperimental_sanitize_metadata_EQ) ||
A->getOption().matches(
options::OPT_fno_experimental_sanitize_metadata_EQ));
int Features = 0;
for (int i = 0, n = A->getNumValues(); i != n; ++i) {
const char *Value = A->getValue(i);
int F = llvm::StringSwitch<int>(Value)
.Case("covered", BinaryMetadataCovered)
.Case("atomics", BinaryMetadataAtomics)
.Case("uar", BinaryMetadataUAR)
.Case("all", ~0)
.Default(0);
if (F == 0 && DiagnoseErrors)
D.Diag(clang::diag::err_drv_unsupported_option_argument)
<< A->getSpelling() << Value;
Features |= F;
}
return Features;
}
std::string lastArgumentForMask(const Driver &D, const llvm::opt::ArgList &Args,
SanitizerMask 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)) {
SanitizerMask AddKinds =
expandSanitizerGroups(parseArgValues(D, Arg, false));
if (AddKinds & Mask)
return describeSanitizeArg(Arg, Mask);
} else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
SanitizerMask RemoveKinds =
expandSanitizerGroups(parseArgValues(D, Arg, false));
Mask &= ~RemoveKinds;
}
}
llvm_unreachable("arg list didn't provide expected value");
}
std::string describeSanitizeArg(const llvm::opt::Arg *A, SanitizerMask 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 (expandSanitizerGroups(
parseSanitizerValue(A->getValue(i), /*AllowGroups=*/true)) &
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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