std::string SanitizerArgs::lastArgumentForKind(const Driver &D,
                                               const llvm::opt::ArgList &Args,
                                               unsigned Kind) {
  for (llvm::opt::ArgList::const_reverse_iterator I = Args.rbegin(),
                                                  E = Args.rend();
       I != E; ++I) {
    unsigned Add, Remove;
    if (parse(D, Args, *I, Add, Remove, false) &&
        (expandGroups(Add) & Kind))
      return describeSanitizeArg(Args, *I, Kind);
    Kind &= ~Remove;
  }
  llvm_unreachable("arg list didn't provide expected value");
}
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");
}
static SanitizerMask parseSanitizeTrapArgs(const Driver &D,
                                           const llvm::opt::ArgList &Args) {
  SanitizerMask TrapRemove = 0; // During the loop below, the accumulated set of
                                // sanitizers disabled by the current sanitizer
                                // argument or any argument after it.
  SanitizerMask TrappingKinds = 0;
  SanitizerMask TrappingSupportedWithGroups = setGroupBits(TrappingSupported);

  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_trap_EQ)) {
      Arg->claim();
      SanitizerMask Add = parseArgValues(D, Arg, true);
      Add &= ~TrapRemove;
      if (SanitizerMask InvalidValues = Add & ~TrappingSupportedWithGroups) {
        SanitizerSet S;
        S.Mask = InvalidValues;
        D.Diag(diag::err_drv_unsupported_option_argument) << "-fsanitize-trap"
                                                          << toString(S);
      }
      TrappingKinds |= expandSanitizerGroups(Add) & ~TrapRemove;
    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_trap_EQ)) {
      Arg->claim();
      TrapRemove |= expandSanitizerGroups(parseArgValues(D, Arg, true));
    } else if (Arg->getOption().matches(
                   options::OPT_fsanitize_undefined_trap_on_error)) {
      Arg->claim();
      TrappingKinds |=
          expandSanitizerGroups(UndefinedGroup & ~TrapRemove) & ~TrapRemove;
    } else if (Arg->getOption().matches(
                   options::OPT_fno_sanitize_undefined_trap_on_error)) {
      Arg->claim();
      TrapRemove |= expandSanitizerGroups(UndefinedGroup);
    }
  }

  // Apply default trapping behavior.
  TrappingKinds |= TrappingDefault & ~TrapRemove;

  return TrappingKinds;
}
SanitizerArgs::SanitizerArgs(const ToolChain &TC,
                             const llvm::opt::ArgList &Args) {
  clear();
  unsigned AllAdd = 0;  // All kinds of sanitizers that were turned on
                        // at least once (possibly, disabled further).
  unsigned AllRemove = 0;  // During the loop below, the accumulated set of
                           // sanitizers disabled by the current sanitizer
                           // argument or any argument after it.
  unsigned DiagnosedKinds = 0;  // All Kinds we have diagnosed up to now.
                                // Used to deduplicate diagnostics.
  const Driver &D = TC.getDriver();
  for (ArgList::const_reverse_iterator I = Args.rbegin(), E = Args.rend();
       I != E; ++I) {
    unsigned Add, Remove;
    if (!parse(D, Args, *I, Add, Remove, true))
      continue;
    (*I)->claim();

    AllAdd |= expandGroups(Add);
    AllRemove |= expandGroups(Remove);

    // 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.
    Add = filterUnsupportedKinds(TC, Add, Args, *I, /*DiagnoseErrors=*/true,
                                 DiagnosedKinds);
    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 = filterUnsupportedKinds(TC, Add, Args, *I, /*DiagnoseErrors=*/false,
                                 DiagnosedKinds);

    Kind |= Add;
  }

  UbsanTrapOnError =
    Args.hasFlag(options::OPT_fsanitize_undefined_trap_on_error,
                 options::OPT_fno_sanitize_undefined_trap_on_error, false);

  // Warn about undefined sanitizer options that require runtime support.
  if (UbsanTrapOnError && notAllowedWithTrap()) {
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NotAllowedWithTrap)
      << "-fsanitize-undefined-trap-on-error";
  }

  // Only one runtime library can be used at once.
  bool NeedsAsan = needsAsanRt();
  bool NeedsTsan = needsTsanRt();
  bool NeedsMsan = needsMsanRt();
  bool NeedsLsan = needsLeakDetection();
  if (NeedsAsan && NeedsTsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsAsanRt)
      << lastArgumentForKind(D, Args, NeedsTsanRt);
  if (NeedsAsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsAsanRt)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  if (NeedsTsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsTsanRt)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  if (NeedsLsan && NeedsTsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsLeakDetection)
      << lastArgumentForKind(D, Args, NeedsTsanRt);
  if (NeedsLsan && NeedsMsan)
    D.Diag(diag::err_drv_argument_not_allowed_with)
      << lastArgumentForKind(D, Args, NeedsLeakDetection)
      << lastArgumentForKind(D, Args, NeedsMsanRt);
  // 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-blacklist options.
  if (Arg *BLArg = Args.getLastArg(options::OPT_fsanitize_blacklist,
                                   options::OPT_fno_sanitize_blacklist)) {
    if (BLArg->getOption().matches(options::OPT_fsanitize_blacklist)) {
      std::string BLPath = BLArg->getValue();
      if (llvm::sys::fs::exists(BLPath)) {
        // Validate the blacklist format.
        std::string BLError;
        std::unique_ptr<llvm::SpecialCaseList> SCL(
            llvm::SpecialCaseList::create(BLPath, BLError));
        if (!SCL.get())
          D.Diag(diag::err_drv_malformed_sanitizer_blacklist) << BLError;
        else
          BlacklistFile = BLPath;
      } else {
        D.Diag(diag::err_drv_no_such_file) << BLPath;
      }
    }
  } else {
    // If no -fsanitize-blacklist option is specified, try to look up for
    // blacklist in the resource directory.
    std::string BLPath;
    if (getDefaultBlacklistForKind(D, Kind, BLPath) &&
        llvm::sys::fs::exists(BLPath))
      BlacklistFile = BLPath;
  }

  // Parse -f[no-]sanitize-memory-track-origins[=level] options.
  if (NeedsMsan) {
    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 = 1;
      } 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(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
        }
      }
    }
  }

  if (NeedsAsan) {
    AsanSharedRuntime =
        Args.hasArg(options::OPT_shared_libasan) ||
        (TC.getTriple().getEnvironment() == llvm::Triple::Android);
    AsanZeroBaseShadow =
        (TC.getTriple().getEnvironment() == llvm::Triple::Android);
  }
}
SanitizerArgs::SanitizerArgs(const ToolChain &TC,
                             const llvm::opt::ArgList &Args) {
  clear();
  SanitizerMask AllRemove = 0;  // During the loop below, the accumulated set of
                                // sanitizers disabled by the current sanitizer
                                // argument or any argument after it.
  SanitizerMask AllAddedKinds = 0;  // 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 = 0;  // All Kinds we have diagnosed up to now.
                                     // Used to deduplicate diagnostics.
  SanitizerMask Kinds = 0;
  const SanitizerMask Supported = setGroupBits(TC.getSupportedSanitizers());
  ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();

  const Driver &D = TC.getDriver();
  SanitizerMask TrappingKinds = parseSanitizeTrapArgs(D, Args);
  SanitizerMask InvalidTrappingKinds = TrappingKinds & NotAllowedWithTrap;

  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();
      SanitizerMask Add = parseArgValues(D, Arg, true);
      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) {
        std::string Desc = describeSanitizeArg(*I, KindsToDiagnose);
        D.Diag(diag::err_drv_argument_not_allowed_with)
            << Desc << "-fsanitize-trap=undefined";
        DiagnosedKinds |= KindsToDiagnose;
      }
      Add &= ~InvalidTrappingKinds;
      if (SanitizerMask KindsToDiagnose = Add & ~Supported & ~DiagnosedKinds) {
        std::string Desc = describeSanitizeArg(*I, 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 & 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 |= 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;
      Add &= Supported;

      Kinds |= Add;
    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
      Arg->claim();
      SanitizerMask Remove = parseArgValues(D, Arg, true);
      AllRemove |= expandSanitizerGroups(Remove);
    }
  }

  // We disable the vptr sanitizer if it was enabled by group expansion but RTTI
  // is disabled.
  if ((Kinds & Vptr) &&
      (RTTIMode == ToolChain::RM_DisabledImplicitly ||
       RTTIMode == ToolChain::RM_DisabledExplicitly)) {
    Kinds &= ~Vptr;
  }

  // Check that LTO is enabled if we need it.
  if ((Kinds & NeedsLTO) && !D.isUsingLTO()) {
    D.Diag(diag::err_drv_argument_only_allowed_with)
        << lastArgumentForMask(D, Args, Kinds & NeedsLTO) << "-flto";
  }

  // 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 & 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 &= ~CFI;
    if (KindsToDiagnose) {
      SanitizerSet S;
      S.Mask = KindsToDiagnose;
      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.
  std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
      std::make_pair(Address, Thread), std::make_pair(Address, Memory),
      std::make_pair(Thread, Memory), std::make_pair(Leak, Thread),
      std::make_pair(Leak, Memory), std::make_pair(KernelAddress, Address),
      std::make_pair(KernelAddress, Leak),
      std::make_pair(KernelAddress, Thread),
      std::make_pair(KernelAddress, Memory)};
  for (auto G : IncompatibleGroups) {
    SanitizerMask Group = G.first;
    if (Kinds & Group) {
      if (SanitizerMask 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.
  SanitizerMask RecoverableKinds = RecoverableByDefault;
  SanitizerMask 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 |= expandSanitizerGroups(LegacyFsanitizeRecoverMask);
      Arg->claim();
    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover)) {
      DeprecatedReplacement = "-fno-sanitize-recover=undefined,integer";
      RecoverableKinds &= ~expandSanitizerGroups(LegacyFsanitizeRecoverMask);
      Arg->claim();
    } else if (Arg->getOption().matches(options::OPT_fsanitize_recover_EQ)) {
      SanitizerMask Add = parseArgValues(D, Arg, true);
      // Report error if user explicitly tries to recover from unrecoverable
      // sanitizer.
      if (SanitizerMask KindsToDiagnose =
              Add & Unrecoverable & ~DiagnosedUnrecoverableKinds) {
        SanitizerSet SetToDiagnose;
        SetToDiagnose.Mask |= KindsToDiagnose;
        D.Diag(diag::err_drv_unsupported_option_argument)
            << Arg->getOption().getName() << toString(SetToDiagnose);
        DiagnosedUnrecoverableKinds |= KindsToDiagnose;
      }
      RecoverableKinds |= expandSanitizerGroups(Add);
      Arg->claim();
    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover_EQ)) {
      RecoverableKinds &= ~expandSanitizerGroups(parseArgValues(D, Arg, true));
      Arg->claim();
    }
    if (DeprecatedReplacement) {
      D.Diag(diag::warn_drv_deprecated_arg) << Arg->getAsString(Args)
                                            << DeprecatedReplacement;
    }
  }
  RecoverableKinds &= Kinds;
  RecoverableKinds &= ~Unrecoverable;

  TrappingKinds &= Kinds;

  // 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);
        ExtraDeps.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();
      ExtraDeps.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 (AllAddedKinds & 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;
        }
      }
    }
    MsanUseAfterDtor =
        Args.hasArg(options::OPT_fsanitize_memory_use_after_dtor);
    NeedPIE |= !(TC.getTriple().isOSLinux() &&
                 TC.getTriple().getArch() == llvm::Triple::x86_64);
  }

  // Parse -f(no-)?sanitize-coverage flags if coverage is supported by the
  // enabled sanitizers.
  if (AllAddedKinds & SupportsCoverage) {
    for (const auto *Arg : Args) {
      if (Arg->getOption().matches(options::OPT_fsanitize_coverage)) {
        Arg->claim();
        int LegacySanitizeCoverage;
        if (Arg->getNumValues() == 1 &&
            !StringRef(Arg->getValue(0))
                 .getAsInteger(0, LegacySanitizeCoverage) &&
            LegacySanitizeCoverage >= 0 && LegacySanitizeCoverage <= 4) {
          // TODO: Add deprecation notice for this form.
          switch (LegacySanitizeCoverage) {
          case 0:
            CoverageFeatures = 0;
            break;
          case 1:
            CoverageFeatures = CoverageFunc;
            break;
          case 2:
            CoverageFeatures = CoverageBB;
            break;
          case 3:
            CoverageFeatures = CoverageEdge;
            break;
          case 4:
            CoverageFeatures = CoverageEdge | CoverageIndirCall;
            break;
          }
          continue;
        }
        CoverageFeatures |= parseCoverageFeatures(D, Arg);
      } else if (Arg->getOption().matches(options::OPT_fno_sanitize_coverage)) {
        Arg->claim();
        CoverageFeatures &= ~parseCoverageFeatures(D, Arg);
      }
    }
  }
  // Choose at most one coverage type: function, bb, or edge.
  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.
  int CoverageTypes = CoverageFunc | CoverageBB | CoverageEdge;
  if ((CoverageFeatures & CoverageTraceBB) &&
      !(CoverageFeatures & CoverageTypes))
    D.Diag(clang::diag::err_drv_argument_only_allowed_with)
        << "-fsanitize-coverage=trace-bb"
        << "-fsanitize-coverage=(func|bb|edge)";
  if ((CoverageFeatures & Coverage8bitCounters) &&
      !(CoverageFeatures & CoverageTypes))
    D.Diag(clang::diag::err_drv_argument_only_allowed_with)
        << "-fsanitize-coverage=8bit-counters"
        << "-fsanitize-coverage=(func|bb|edge)";

  if (AllAddedKinds & Address) {
    AsanSharedRuntime =
        Args.hasArg(options::OPT_shared_libasan) || TC.getTriple().isAndroid();
    NeedPIE |= TC.getTriple().isAndroid();
    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)
            << lastArgumentForMask(D, Args, 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.
  Sanitizers.Mask |= Kinds;
  RecoverableSanitizers.Mask |= RecoverableKinds;
  TrapSanitizers.Mask |= TrappingKinds;
}
Esempio n. 6
0
SanitizerArgs::SanitizerArgs(const ToolChain &TC,
                             const llvm::opt::ArgList &Args) {
  SanitizerMask AllRemove = 0;  // During the loop below, the accumulated set of
                                // sanitizers disabled by the current sanitizer
                                // argument or any argument after it.
  SanitizerMask AllAddedKinds = 0;  // 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 = 0;  // All Kinds we have diagnosed up to now.
                                     // Used to deduplicate diagnostics.
  SanitizerMask Kinds = 0;
  const SanitizerMask Supported = setGroupBits(TC.getSupportedSanitizers());
  ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();

  const Driver &D = TC.getDriver();
  SanitizerMask TrappingKinds = parseSanitizeTrapArgs(D, Args);
  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 (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();
      SanitizerMask Add = parseArgValues(D, Arg, /*AllowGroups=*/true);

      if (RemoveObjectSizeAtO0) {
        AllRemove |= SanitizerKind::ObjectSize;

        // The user explicitly enabled the object size sanitizer. Warn that
        // that this does nothing at -O0.
        if (Add & SanitizerKind::ObjectSize)
          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) {
        std::string Desc = describeSanitizeArg(*I, 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) {
          std::string Desc = describeSanitizeArg(*I, KindsToDiagnose);
          D.Diag(diag::err_drv_argument_not_allowed_with)
              << Desc << "-fsanitize-minimal-runtime";
          DiagnosedKinds |= KindsToDiagnose;
        }
        Add &= ~NotAllowedWithMinimalRuntime;
      }

      if (SanitizerMask KindsToDiagnose = Add & ~Supported & ~DiagnosedKinds) {
        std::string Desc = describeSanitizeArg(*I, 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 & 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 |= 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;
      }
      Add &= Supported;

      if (Add & Fuzzer)
        Add |= FuzzerNoLink;

      // Enable coverage if the fuzzing flag is set.
      if (Add & 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, true);
      AllRemove |= expandSanitizerGroups(Remove);
    }
  }

  // Enable toolchain specific default sanitizers if not explicitly disabled.
  Kinds |= TC.getDefaultSanitizers() & ~AllRemove;

  // We disable the vptr sanitizer if it was enabled by group expansion but RTTI
  // is disabled.
  if ((Kinds & Vptr) &&
      (RTTIMode == ToolChain::RM_DisabledImplicitly ||
       RTTIMode == ToolChain::RM_DisabledExplicitly)) {
    Kinds &= ~Vptr;
  }

  // Check that LTO is enabled if we need it.
  if ((Kinds & NeedsLTO) && !D.isUsingLTO()) {
    D.Diag(diag::err_drv_argument_only_allowed_with)
        << lastArgumentForMask(D, Args, Kinds & NeedsLTO) << "-flto";
  }

  // 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 & 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 &= ~CFI;
    if (KindsToDiagnose) {
      SanitizerSet S;
      S.Mask = KindsToDiagnose;
      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.
  std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
      std::make_pair(Address, Thread), std::make_pair(Address, Memory),
      std::make_pair(Thread, Memory), std::make_pair(Leak, Thread),
      std::make_pair(Leak, Memory), std::make_pair(KernelAddress, Address),
      std::make_pair(KernelAddress, Leak),
      std::make_pair(KernelAddress, Thread),
      std::make_pair(KernelAddress, Memory),
      std::make_pair(Efficiency, Address),
      std::make_pair(Efficiency, Leak),
      std::make_pair(Efficiency, Thread),
      std::make_pair(Efficiency, Memory),
      std::make_pair(Efficiency, KernelAddress)};
  for (auto G : IncompatibleGroups) {
    SanitizerMask Group = G.first;
    if (Kinds & Group) {
      if (SanitizerMask 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.
  SanitizerMask RecoverableKinds = RecoverableByDefault;
  SanitizerMask DiagnosedUnrecoverableKinds = 0;
  for (const auto *Arg : Args) {
    const char *DeprecatedReplacement = nullptr;
    if (Arg->getOption().matches(options::OPT_fsanitize_recover)) {
      DeprecatedReplacement =
          "-fsanitize-recover=undefined,integer' or '-fsanitize-recover=all";
      RecoverableKinds |= expandSanitizerGroups(LegacyFsanitizeRecoverMask);
      Arg->claim();
    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover)) {
      DeprecatedReplacement = "-fno-sanitize-recover=undefined,integer' or "
                              "'-fno-sanitize-recover=all";
      RecoverableKinds &= ~expandSanitizerGroups(LegacyFsanitizeRecoverMask);
      Arg->claim();
    } else if (Arg->getOption().matches(options::OPT_fsanitize_recover_EQ)) {
      SanitizerMask Add = parseArgValues(D, Arg, true);
      // Report error if user explicitly tries to recover from unrecoverable
      // sanitizer.
      if (SanitizerMask KindsToDiagnose =
              Add & Unrecoverable & ~DiagnosedUnrecoverableKinds) {
        SanitizerSet SetToDiagnose;
        SetToDiagnose.Mask |= KindsToDiagnose;
        D.Diag(diag::err_drv_unsupported_option_argument)
            << Arg->getOption().getName() << toString(SetToDiagnose);
        DiagnosedUnrecoverableKinds |= KindsToDiagnose;
      }
      RecoverableKinds |= expandSanitizerGroups(Add);
      Arg->claim();
    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover_EQ)) {
      RecoverableKinds &= ~expandSanitizerGroups(parseArgValues(D, Arg, true));
      Arg->claim();
    }
    if (DeprecatedReplacement) {
      D.Diag(diag::warn_drv_deprecated_arg) << Arg->getAsString(Args)
                                            << DeprecatedReplacement;
    }
  }
  RecoverableKinds &= Kinds;
  RecoverableKinds &= ~Unrecoverable;

  TrappingKinds &= Kinds;

  // 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);
        ExtraDeps.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();
      ExtraDeps.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 (AllAddedKinds & 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;
        }
      }
    }
    MsanUseAfterDtor =
        Args.hasFlag(options::OPT_fsanitize_memory_use_after_dtor,
                     options::OPT_fno_sanitize_memory_use_after_dtor,
                     MsanUseAfterDtor);
    NeedPIE |= !(TC.getTriple().isOSLinux() &&
                 TC.getTriple().getArch() == llvm::Triple::x86_64);
  } else {
    MsanUseAfterDtor = false;
  }

  if (AllAddedKinds & 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 & CFI) {
    CfiCrossDso = Args.hasFlag(options::OPT_fsanitize_cfi_cross_dso,
                               options::OPT_fno_sanitize_cfi_cross_dso, false);
    // Without PIE, external function address may resolve to a PLT record, which
    // can not be verified by the target module.
    NeedPIE |= CfiCrossDso;
  }

  Stats = Args.hasFlag(options::OPT_fsanitize_stats,
                       options::OPT_fno_sanitize_stats, false);

  if (MinimalRuntime) {
    SanitizerMask IncompatibleMask =
        Kinds & ~setGroupBits(CompatibleWithMinimalRuntime);
    if (IncompatibleMask)
      D.Diag(clang::diag::err_drv_argument_not_allowed_with)
          << "-fsanitize-minimal-runtime"
          << lastArgumentForMask(D, Args, IncompatibleMask);

    SanitizerMask NonTrappingCfi = Kinds & CFI & ~TrappingKinds;
    if (NonTrappingCfi)
      D.Diag(clang::diag::err_drv_argument_only_allowed_with)
          << "fsanitize-minimal-runtime"
          << "fsanitize-trap=cfi";
  }

  // 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) {
          D.Diag(diag::warn_drv_deprecated_arg)
              << Arg->getAsString(Args) << "-fsanitize-coverage=trace-pc-guard";
        }
        continue;
      }
      CoverageFeatures |= parseCoverageFeatures(D, Arg);

      // 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);
    }
  }
  // Choose at most one coverage type: function, bb, or edge.
  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"
        << "-fsanitize-coverage=trace-pc-guard";
  if (CoverageFeatures & Coverage8bitCounters)
    D.Diag(clang::diag::warn_drv_deprecated_arg)
        << "-fsanitize-coverage=8bit-counters"
        << "-fsanitize-coverage=trace-pc-guard";

  int InsertionPointTypes = CoverageFunc | CoverageBB | CoverageEdge;
  int InstrumentationTypes =
      CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters;
  if ((CoverageFeatures & InsertionPointTypes) &&
      !(CoverageFeatures & InstrumentationTypes)) {
    D.Diag(clang::diag::warn_drv_deprecated_arg)
        << "-fsanitize-coverage=[func|bb|edge]"
        << "-fsanitize-coverage=[func|bb|edge],[trace-pc-guard|trace-pc]";
  }

  // trace-pc w/o func/bb/edge implies edge.
  if (!(CoverageFeatures & InsertionPointTypes)) {
    if (CoverageFeatures &
        (CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters))
      CoverageFeatures |= CoverageEdge;

    if (CoverageFeatures & CoverageStackDepth)
      CoverageFeatures |= CoverageFunc;
  }

  if (AllAddedKinds & Address) {
    AsanSharedRuntime =
        Args.hasArg(options::OPT_shared_libasan) ||
        TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia();
    NeedPIE |= TC.getTriple().isAndroid() || 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) {
          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)
            << lastArgumentForMask(D, Args, Address);
        D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
      }
    }

    AsanUseAfterScope = Args.hasFlag(
        options::OPT_fsanitize_address_use_after_scope,
        options::OPT_fno_sanitize_address_use_after_scope, AsanUseAfterScope);

    // As a workaround for a bug in gold 2.26 and earlier, dead stripping of
    // globals in ASan is disabled by default on ELF targets.
    // See https://sourceware.org/bugzilla/show_bug.cgi?id=19002
    AsanGlobalsDeadStripping =
        !TC.getTriple().isOSBinFormatELF() || TC.getTriple().isOSFuchsia() ||
        Args.hasArg(options::OPT_fsanitize_address_globals_dead_stripping);
  } else {
    AsanUseAfterScope = false;
  }

  if (AllAddedKinds & SafeStack) {
    // SafeStack runtime is built into the system on Fuchsia.
    SafeStackRuntime = !TC.getTriple().isOSFuchsia();
  }

  // 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.
  Sanitizers.Mask |= Kinds;
  RecoverableSanitizers.Mask |= RecoverableKinds;
  TrapSanitizers.Mask |= TrappingKinds;
}