Clang Project

clang_source_code/lib/Driver/SanitizerArgs.cpp
1//===--- SanitizerArgs.cpp - Arguments for sanitizer tools  ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8#include "clang/Driver/SanitizerArgs.h"
9#include "ToolChains/CommonArgs.h"
10#include "clang/Basic/Sanitizers.h"
11#include "clang/Driver/Driver.h"
12#include "clang/Driver/DriverDiagnostic.h"
13#include "clang/Driver/Options.h"
14#include "clang/Driver/ToolChain.h"
15#include "llvm/ADT/StringExtras.h"
16#include "llvm/ADT/StringSwitch.h"
17#include "llvm/Support/FileSystem.h"
18#include "llvm/Support/Path.h"
19#include "llvm/Support/SpecialCaseList.h"
20#include "llvm/Support/TargetParser.h"
21#include <memory>
22
23using namespace clang;
24using namespace clang::driver;
25using namespace llvm::opt;
26
27static const SanitizerMask NeedsUbsanRt =
28    SanitizerKind::Undefined | SanitizerKind::Integer |
29    SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
30    SanitizerKind::CFI;
31static const SanitizerMask NeedsUbsanCxxRt =
32    SanitizerKind::Vptr | SanitizerKind::CFI;
33static const SanitizerMask NotAllowedWithTrap = SanitizerKind::Vptr;
34static const SanitizerMask NotAllowedWithMinimalRuntime = SanitizerKind::Vptr;
35static const SanitizerMask RequiresPIE =
36    SanitizerKind::DataFlow | SanitizerKind::HWAddress | SanitizerKind::Scudo;
37static const SanitizerMask NeedsUnwindTables =
38    SanitizerKind::Address | SanitizerKind::HWAddress | SanitizerKind::Thread |
39    SanitizerKind::Memory | SanitizerKind::DataFlow;
40static const SanitizerMask SupportsCoverage =
41    SanitizerKind::Address | SanitizerKind::HWAddress |
42    SanitizerKind::KernelAddress | SanitizerKind::KernelHWAddress |
43    SanitizerKind::Memory | SanitizerKind::KernelMemory | SanitizerKind::Leak |
44    SanitizerKind::Undefined | SanitizerKind::Integer |
45    SanitizerKind::ImplicitConversion | SanitizerKind::Nullability |
46    SanitizerKind::DataFlow | SanitizerKind::Fuzzer |
47    SanitizerKind::FuzzerNoLink;
48static const SanitizerMask RecoverableByDefault =
49    SanitizerKind::Undefined | SanitizerKind::Integer |
50    SanitizerKind::ImplicitConversion | SanitizerKind::Nullability;
51static const SanitizerMask Unrecoverable =
52    SanitizerKind::Unreachable | SanitizerKind::Return;
53static const SanitizerMask AlwaysRecoverable =
54    SanitizerKind::KernelAddress | SanitizerKind::KernelHWAddress;
55static const SanitizerMask LegacyFsanitizeRecoverMask =
56    SanitizerKind::Undefined | SanitizerKind::Integer;
57static const SanitizerMask NeedsLTO = SanitizerKind::CFI;
58static const SanitizerMask TrappingSupported =
59    (SanitizerKind::Undefined & ~SanitizerKind::Vptr) |
60    SanitizerKind::UnsignedIntegerOverflow | SanitizerKind::ImplicitConversion |
61    SanitizerKind::Nullability | SanitizerKind::LocalBounds |
62    SanitizerKind::CFI;
63static const SanitizerMask TrappingDefault = SanitizerKind::CFI;
64static const SanitizerMask CFIClasses =
65    SanitizerKind::CFIVCall | SanitizerKind::CFINVCall |
66    SanitizerKind::CFIMFCall | SanitizerKind::CFIDerivedCast |
67    SanitizerKind::CFIUnrelatedCast;
68static const SanitizerMask CompatibleWithMinimalRuntime =
69    TrappingSupported | SanitizerKind::Scudo | SanitizerKind::ShadowCallStack;
70
71enum CoverageFeature {
72  CoverageFunc = 1 << 0,
73  CoverageBB = 1 << 1,
74  CoverageEdge = 1 << 2,
75  CoverageIndirCall = 1 << 3,
76  CoverageTraceBB = 1 << 4,  // Deprecated.
77  CoverageTraceCmp = 1 << 5,
78  CoverageTraceDiv = 1 << 6,
79  CoverageTraceGep = 1 << 7,
80  Coverage8bitCounters = 1 << 8,  // Deprecated.
81  CoverageTracePC = 1 << 9,
82  CoverageTracePCGuard = 1 << 10,
83  CoverageNoPrune = 1 << 11,
84  CoverageInline8bitCounters = 1 << 12,
85  CoveragePCTable = 1 << 13,
86  CoverageStackDepth = 1 << 14,
87};
88
89/// Parse a -fsanitize= or -fno-sanitize= argument's values, diagnosing any
90/// invalid components. Returns a SanitizerMask.
91static SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
92                                    bool DiagnoseErrors);
93
94/// Parse -f(no-)?sanitize-coverage= flag values, diagnosing any invalid
95/// components. Returns OR of members of \c CoverageFeature enumeration.
96static int parseCoverageFeatures(const Driver &D, const llvm::opt::Arg *A);
97
98/// Produce an argument string from ArgList \p Args, which shows how it
99/// provides some sanitizer kind from \p Mask. For example, the argument list
100/// "-fsanitize=thread,vptr -fsanitize=address" with mask \c NeedsUbsanRt
101/// would produce "-fsanitize=vptr".
102static std::string lastArgumentForMask(const Driver &D,
103                                       const llvm::opt::ArgList &Args,
104                                       SanitizerMask Mask);
105
106/// Produce an argument string from argument \p A, which shows how it provides
107/// a value in \p Mask. For instance, the argument
108/// "-fsanitize=address,alignment" with mask \c NeedsUbsanRt would produce
109/// "-fsanitize=alignment".
110static std::string describeSanitizeArg(const llvm::opt::Arg *A,
111                                       SanitizerMask Mask);
112
113/// Produce a string containing comma-separated names of sanitizers in \p
114/// Sanitizers set.
115static std::string toString(const clang::SanitizerSet &Sanitizers);
116
117static void addDefaultBlacklists(const Driver &D, SanitizerMask Kinds,
118                                 std::vector<std::string> &BlacklistFiles) {
119  struct Blacklist {
120    const char *File;
121    SanitizerMask Mask;
122  } Blacklists[] = {{"asan_blacklist.txt", SanitizerKind::Address},
123                    {"hwasan_blacklist.txt", SanitizerKind::HWAddress},
124                    {"msan_blacklist.txt", SanitizerKind::Memory},
125                    {"tsan_blacklist.txt", SanitizerKind::Thread},
126                    {"dfsan_abilist.txt", SanitizerKind::DataFlow},
127                    {"cfi_blacklist.txt", SanitizerKind::CFI},
128                    {"ubsan_blacklist.txt", SanitizerKind::Undefined |
129                                                SanitizerKind::Integer |
130                                                SanitizerKind::Nullability}};
131
132  for (auto BL : Blacklists) {
133    if (!(Kinds & BL.Mask))
134      continue;
135
136    clang::SmallString<64> Path(D.ResourceDir);
137    llvm::sys::path::append(Path, "share", BL.File);
138    if (llvm::sys::fs::exists(Path))
139      BlacklistFiles.push_back(Path.str());
140    else if (BL.Mask == SanitizerKind::CFI)
141      // If cfi_blacklist.txt cannot be found in the resource dir, driver
142      // should fail.
143      D.Diag(clang::diag::err_drv_no_such_file) << Path;
144  }
145}
146
147/// Sets group bits for every group that has at least one representative already
148/// enabled in \p Kinds.
149static SanitizerMask setGroupBits(SanitizerMask Kinds) {
150#define SANITIZER(NAME, ID)
151#define SANITIZER_GROUP(NAME, ID, ALIAS)                                       \
152  if (Kinds & SanitizerKind::ID)                                               \
153    Kinds |= SanitizerKind::ID##Group;
154#include "clang/Basic/Sanitizers.def"
155  return Kinds;
156}
157
158static SanitizerMask parseSanitizeTrapArgs(const Driver &D,
159                                           const llvm::opt::ArgList &Args) {
160  SanitizerMask TrapRemove;     // During the loop below, the accumulated set of
161                                // sanitizers disabled by the current sanitizer
162                                // argument or any argument after it.
163  SanitizerMask TrappingKinds;
164  SanitizerMask TrappingSupportedWithGroups = setGroupBits(TrappingSupported);
165
166  for (ArgList::const_reverse_iterator I = Args.rbegin(), E = Args.rend();
167       I != E; ++I) {
168    const auto *Arg = *I;
169    if (Arg->getOption().matches(options::OPT_fsanitize_trap_EQ)) {
170      Arg->claim();
171      SanitizerMask Add = parseArgValues(D, Arg, true);
172      Add &= ~TrapRemove;
173      if (SanitizerMask InvalidValues = Add & ~TrappingSupportedWithGroups) {
174        SanitizerSet S;
175        S.Mask = InvalidValues;
176        D.Diag(diag::err_drv_unsupported_option_argument) << "-fsanitize-trap"
177                                                          << toString(S);
178      }
179      TrappingKinds |= expandSanitizerGroups(Add) & ~TrapRemove;
180    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_trap_EQ)) {
181      Arg->claim();
182      TrapRemove |= expandSanitizerGroups(parseArgValues(D, Arg, true));
183    } else if (Arg->getOption().matches(
184                   options::OPT_fsanitize_undefined_trap_on_error)) {
185      Arg->claim();
186      TrappingKinds |=
187          expandSanitizerGroups(SanitizerKind::UndefinedGroup & ~TrapRemove) &
188          ~TrapRemove;
189    } else if (Arg->getOption().matches(
190                   options::OPT_fno_sanitize_undefined_trap_on_error)) {
191      Arg->claim();
192      TrapRemove |= expandSanitizerGroups(SanitizerKind::UndefinedGroup);
193    }
194  }
195
196  // Apply default trapping behavior.
197  TrappingKinds |= TrappingDefault & ~TrapRemove;
198
199  return TrappingKinds;
200}
201
202bool SanitizerArgs::needsUbsanRt() const {
203  // All of these include ubsan.
204  if (needsAsanRt() || needsMsanRt() || needsHwasanRt() || needsTsanRt() ||
205      needsDfsanRt() || needsLsanRt() || needsCfiDiagRt() ||
206      (needsScudoRt() && !requiresMinimalRuntime()))
207    return false;
208
209  return (Sanitizers.Mask & NeedsUbsanRt & ~TrapSanitizers.Mask) ||
210         CoverageFeatures;
211}
212
213bool SanitizerArgs::needsCfiRt() const {
214  return !(Sanitizers.Mask & SanitizerKind::CFI & ~TrapSanitizers.Mask) &&
215         CfiCrossDso && !ImplicitCfiRuntime;
216}
217
218bool SanitizerArgs::needsCfiDiagRt() const {
219  return (Sanitizers.Mask & SanitizerKind::CFI & ~TrapSanitizers.Mask) &&
220         CfiCrossDso && !ImplicitCfiRuntime;
221}
222
223bool SanitizerArgs::requiresPIE() const {
224  return NeedPIE || (Sanitizers.Mask & RequiresPIE);
225}
226
227bool SanitizerArgs::needsUnwindTables() const {
228  return static_cast<bool>(Sanitizers.Mask & NeedsUnwindTables);
229}
230
231bool SanitizerArgs::needsLTO() const {
232  return static_cast<bool>(Sanitizers.Mask & NeedsLTO);
233}
234
235SanitizerArgs::SanitizerArgs(const ToolChain &TC,
236                             const llvm::opt::ArgList &Args) {
237  SanitizerMask AllRemove;      // During the loop below, the accumulated set of
238                                // sanitizers disabled by the current sanitizer
239                                // argument or any argument after it.
240  SanitizerMask AllAddedKinds;      // Mask of all sanitizers ever enabled by
241                                    // -fsanitize= flags (directly or via group
242                                    // expansion), some of which may be disabled
243                                    // later. Used to carefully prune
244                                    // unused-argument diagnostics.
245  SanitizerMask DiagnosedKinds;      // All Kinds we have diagnosed up to now.
246                                     // Used to deduplicate diagnostics.
247  SanitizerMask Kinds;
248  const SanitizerMask Supported = setGroupBits(TC.getSupportedSanitizers());
249
250  CfiCrossDso = Args.hasFlag(options::OPT_fsanitize_cfi_cross_dso,
251                             options::OPT_fno_sanitize_cfi_cross_dso, false);
252
253  ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();
254
255  const Driver &D = TC.getDriver();
256  SanitizerMask TrappingKinds = parseSanitizeTrapArgs(D, Args);
257  SanitizerMask InvalidTrappingKinds = TrappingKinds & NotAllowedWithTrap;
258
259  MinimalRuntime =
260      Args.hasFlag(options::OPT_fsanitize_minimal_runtime,
261                   options::OPT_fno_sanitize_minimal_runtime, MinimalRuntime);
262
263  // The object size sanitizer should not be enabled at -O0.
264  Arg *OptLevel = Args.getLastArg(options::OPT_O_Group);
265  bool RemoveObjectSizeAtO0 =
266      !OptLevel || OptLevel->getOption().matches(options::OPT_O0);
267
268  for (ArgList::const_reverse_iterator I = Args.rbegin(), E = Args.rend();
269       I != E; ++I) {
270    const auto *Arg = *I;
271    if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
272      Arg->claim();
273      SanitizerMask Add = parseArgValues(D, Arg, /*AllowGroups=*/true);
274
275      if (RemoveObjectSizeAtO0) {
276        AllRemove |= SanitizerKind::ObjectSize;
277
278        // The user explicitly enabled the object size sanitizer. Warn
279        // that this does nothing at -O0.
280        if (Add & SanitizerKind::ObjectSize)
281          D.Diag(diag::warn_drv_object_size_disabled_O0)
282              << Arg->getAsString(Args);
283      }
284
285      AllAddedKinds |= expandSanitizerGroups(Add);
286
287      // Avoid diagnosing any sanitizer which is disabled later.
288      Add &= ~AllRemove;
289      // At this point we have not expanded groups, so any unsupported
290      // sanitizers in Add are those which have been explicitly enabled.
291      // Diagnose them.
292      if (SanitizerMask KindsToDiagnose =
293              Add & InvalidTrappingKinds & ~DiagnosedKinds) {
294        std::string Desc = describeSanitizeArg(*I, KindsToDiagnose);
295        D.Diag(diag::err_drv_argument_not_allowed_with)
296            << Desc << "-fsanitize-trap=undefined";
297        DiagnosedKinds |= KindsToDiagnose;
298      }
299      Add &= ~InvalidTrappingKinds;
300
301      if (MinimalRuntime) {
302        if (SanitizerMask KindsToDiagnose =
303                Add & NotAllowedWithMinimalRuntime & ~DiagnosedKinds) {
304          std::string Desc = describeSanitizeArg(*I, KindsToDiagnose);
305          D.Diag(diag::err_drv_argument_not_allowed_with)
306              << Desc << "-fsanitize-minimal-runtime";
307          DiagnosedKinds |= KindsToDiagnose;
308        }
309        Add &= ~NotAllowedWithMinimalRuntime;
310      }
311
312      // FIXME: Make CFI on member function calls compatible with cross-DSO CFI.
313      // There are currently two problems:
314      // - Virtual function call checks need to pass a pointer to the function
315      //   address to llvm.type.test and a pointer to the address point to the
316      //   diagnostic function. Currently we pass the same pointer to both
317      //   places.
318      // - Non-virtual function call checks may need to check multiple type
319      //   identifiers.
320      // Fixing both of those may require changes to the cross-DSO CFI
321      // interface.
322      if (CfiCrossDso && (Add & SanitizerKind::CFIMFCall & ~DiagnosedKinds)) {
323        D.Diag(diag::err_drv_argument_not_allowed_with)
324            << "-fsanitize=cfi-mfcall"
325            << "-fsanitize-cfi-cross-dso";
326        Add &= ~SanitizerKind::CFIMFCall;
327        DiagnosedKinds |= SanitizerKind::CFIMFCall;
328      }
329
330      if (SanitizerMask KindsToDiagnose = Add & ~Supported & ~DiagnosedKinds) {
331        std::string Desc = describeSanitizeArg(*I, KindsToDiagnose);
332        D.Diag(diag::err_drv_unsupported_opt_for_target)
333            << Desc << TC.getTriple().str();
334        DiagnosedKinds |= KindsToDiagnose;
335      }
336      Add &= Supported;
337
338      // Test for -fno-rtti + explicit -fsanitizer=vptr before expanding groups
339      // so we don't error out if -fno-rtti and -fsanitize=undefined were
340      // passed.
341      if ((Add & SanitizerKind::Vptr) && (RTTIMode == ToolChain::RM_Disabled)) {
342        if (const llvm::opt::Arg *NoRTTIArg = TC.getRTTIArg()) {
343           (0) . __assert_fail ("NoRTTIArg->getOption().matches(options..OPT_fno_rtti) && \"RTTI disabled without -fno-rtti option?\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 344, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(NoRTTIArg->getOption().matches(options::OPT_fno_rtti) &&
344 (0) . __assert_fail ("NoRTTIArg->getOption().matches(options..OPT_fno_rtti) && \"RTTI disabled without -fno-rtti option?\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 344, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">                  "RTTI disabled without -fno-rtti option?");
345          // The user explicitly passed -fno-rtti with -fsanitize=vptr, but
346          // the vptr sanitizer requires RTTI, so this is a user error.
347          D.Diag(diag::err_drv_argument_not_allowed_with)
348              << "-fsanitize=vptr" << NoRTTIArg->getAsString(Args);
349        } else {
350          // The vptr sanitizer requires RTTI, but RTTI is disabled (by
351          // default). Warn that the vptr sanitizer is being disabled.
352          D.Diag(diag::warn_drv_disabling_vptr_no_rtti_default);
353        }
354
355        // Take out the Vptr sanitizer from the enabled sanitizers
356        AllRemove |= SanitizerKind::Vptr;
357      }
358
359      Add = expandSanitizerGroups(Add);
360      // Group expansion may have enabled a sanitizer which is disabled later.
361      Add &= ~AllRemove;
362      // Silently discard any unsupported sanitizers implicitly enabled through
363      // group expansion.
364      Add &= ~InvalidTrappingKinds;
365      if (MinimalRuntime) {
366        Add &= ~NotAllowedWithMinimalRuntime;
367      }
368      if (CfiCrossDso)
369        Add &= ~SanitizerKind::CFIMFCall;
370      Add &= Supported;
371
372      if (Add & SanitizerKind::Fuzzer)
373        Add |= SanitizerKind::FuzzerNoLink;
374
375      // Enable coverage if the fuzzing flag is set.
376      if (Add & SanitizerKind::FuzzerNoLink) {
377        CoverageFeatures |= CoverageInline8bitCounters | CoverageIndirCall |
378                            CoverageTraceCmp | CoveragePCTable;
379        // Due to TLS differences, stack depth tracking is only enabled on Linux
380        if (TC.getTriple().isOSLinux())
381          CoverageFeatures |= CoverageStackDepth;
382      }
383
384      Kinds |= Add;
385    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
386      Arg->claim();
387      SanitizerMask Remove = parseArgValues(D, Arg, true);
388      AllRemove |= expandSanitizerGroups(Remove);
389    }
390  }
391
392  std::pair<SanitizerMask, SanitizerMask> IncompatibleGroups[] = {
393      std::make_pair(SanitizerKind::Address,
394                     SanitizerKind::Thread | SanitizerKind::Memory),
395      std::make_pair(SanitizerKind::Thread, SanitizerKind::Memory),
396      std::make_pair(SanitizerKind::Leak,
397                     SanitizerKind::Thread | SanitizerKind::Memory),
398      std::make_pair(SanitizerKind::KernelAddress,
399                     SanitizerKind::Address | SanitizerKind::Leak |
400                         SanitizerKind::Thread | SanitizerKind::Memory),
401      std::make_pair(SanitizerKind::HWAddress,
402                     SanitizerKind::Address | SanitizerKind::Thread |
403                         SanitizerKind::Memory | SanitizerKind::KernelAddress),
404      std::make_pair(SanitizerKind::Scudo,
405                     SanitizerKind::Address | SanitizerKind::HWAddress |
406                         SanitizerKind::Leak | SanitizerKind::Thread |
407                         SanitizerKind::Memory | SanitizerKind::KernelAddress),
408      std::make_pair(SanitizerKind::SafeStack,
409                     SanitizerKind::Address | SanitizerKind::HWAddress |
410                         SanitizerKind::Leak | SanitizerKind::Thread |
411                         SanitizerKind::Memory | SanitizerKind::KernelAddress),
412      std::make_pair(SanitizerKind::KernelHWAddress,
413                     SanitizerKind::Address | SanitizerKind::HWAddress |
414                         SanitizerKind::Leak | SanitizerKind::Thread |
415                         SanitizerKind::Memory | SanitizerKind::KernelAddress |
416                         SanitizerKind::SafeStack),
417      std::make_pair(SanitizerKind::KernelMemory,
418                     SanitizerKind::Address | SanitizerKind::HWAddress |
419                         SanitizerKind::Leak | SanitizerKind::Thread |
420                         SanitizerKind::Memory | SanitizerKind::KernelAddress |
421                         SanitizerKind::Scudo | SanitizerKind::SafeStack)};
422  // Enable toolchain specific default sanitizers if not explicitly disabled.
423  SanitizerMask Default = TC.getDefaultSanitizers() & ~AllRemove;
424
425  // Disable default sanitizers that are incompatible with explicitly requested
426  // ones.
427  for (auto G : IncompatibleGroups) {
428    SanitizerMask Group = G.first;
429    if ((Default & Group) && (Kinds & G.second))
430      Default &= ~Group;
431  }
432
433  Kinds |= Default;
434
435  // We disable the vptr sanitizer if it was enabled by group expansion but RTTI
436  // is disabled.
437  if ((Kinds & SanitizerKind::Vptr) && (RTTIMode == ToolChain::RM_Disabled)) {
438    Kinds &= ~SanitizerKind::Vptr;
439  }
440
441  // Check that LTO is enabled if we need it.
442  if ((Kinds & NeedsLTO) && !D.isUsingLTO()) {
443    D.Diag(diag::err_drv_argument_only_allowed_with)
444        << lastArgumentForMask(D, Args, Kinds & NeedsLTO) << "-flto";
445  }
446
447  if ((Kinds & SanitizerKind::ShadowCallStack) &&
448      TC.getTriple().getArch() == llvm::Triple::aarch64 &&
449      !llvm::AArch64::isX18ReservedByDefault(TC.getTriple()) &&
450      !Args.hasArg(options::OPT_ffixed_x18)) {
451    D.Diag(diag::err_drv_argument_only_allowed_with)
452        << lastArgumentForMask(D, Args, Kinds & SanitizerKind::ShadowCallStack)
453        << "-ffixed-x18";
454  }
455
456  // Report error if there are non-trapping sanitizers that require
457  // c++abi-specific  parts of UBSan runtime, and they are not provided by the
458  // toolchain. We don't have a good way to check the latter, so we just
459  // check if the toolchan supports vptr.
460  if (~Supported & SanitizerKind::Vptr) {
461    SanitizerMask KindsToDiagnose = Kinds & ~TrappingKinds & NeedsUbsanCxxRt;
462    // The runtime library supports the Microsoft C++ ABI, but only well enough
463    // for CFI. FIXME: Remove this once we support vptr on Windows.
464    if (TC.getTriple().isOSWindows())
465      KindsToDiagnose &= ~SanitizerKind::CFI;
466    if (KindsToDiagnose) {
467      SanitizerSet S;
468      S.Mask = KindsToDiagnose;
469      D.Diag(diag::err_drv_unsupported_opt_for_target)
470          << ("-fno-sanitize-trap=" + toString(S)) << TC.getTriple().str();
471      Kinds &= ~KindsToDiagnose;
472    }
473  }
474
475  // Warn about incompatible groups of sanitizers.
476  for (auto G : IncompatibleGroups) {
477    SanitizerMask Group = G.first;
478    if (Kinds & Group) {
479      if (SanitizerMask Incompatible = Kinds & G.second) {
480        D.Diag(clang::diag::err_drv_argument_not_allowed_with)
481            << lastArgumentForMask(D, Args, Group)
482            << lastArgumentForMask(D, Args, Incompatible);
483        Kinds &= ~Incompatible;
484      }
485    }
486  }
487  // FIXME: Currently -fsanitize=leak is silently ignored in the presence of
488  // -fsanitize=address. Perhaps it should print an error, or perhaps
489  // -f(-no)sanitize=leak should change whether leak detection is enabled by
490  // default in ASan?
491
492  // Parse -f(no-)?sanitize-recover flags.
493  SanitizerMask RecoverableKinds = RecoverableByDefault | AlwaysRecoverable;
494  SanitizerMask DiagnosedUnrecoverableKinds;
495  SanitizerMask DiagnosedAlwaysRecoverableKinds;
496  for (const auto *Arg : Args) {
497    const char *DeprecatedReplacement = nullptr;
498    if (Arg->getOption().matches(options::OPT_fsanitize_recover)) {
499      DeprecatedReplacement =
500          "-fsanitize-recover=undefined,integer' or '-fsanitize-recover=all";
501      RecoverableKinds |= expandSanitizerGroups(LegacyFsanitizeRecoverMask);
502      Arg->claim();
503    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover)) {
504      DeprecatedReplacement = "-fno-sanitize-recover=undefined,integer' or "
505                              "'-fno-sanitize-recover=all";
506      RecoverableKinds &= ~expandSanitizerGroups(LegacyFsanitizeRecoverMask);
507      Arg->claim();
508    } else if (Arg->getOption().matches(options::OPT_fsanitize_recover_EQ)) {
509      SanitizerMask Add = parseArgValues(D, Arg, true);
510      // Report error if user explicitly tries to recover from unrecoverable
511      // sanitizer.
512      if (SanitizerMask KindsToDiagnose =
513              Add & Unrecoverable & ~DiagnosedUnrecoverableKinds) {
514        SanitizerSet SetToDiagnose;
515        SetToDiagnose.Mask |= KindsToDiagnose;
516        D.Diag(diag::err_drv_unsupported_option_argument)
517            << Arg->getOption().getName() << toString(SetToDiagnose);
518        DiagnosedUnrecoverableKinds |= KindsToDiagnose;
519      }
520      RecoverableKinds |= expandSanitizerGroups(Add);
521      Arg->claim();
522    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_recover_EQ)) {
523      SanitizerMask Remove = parseArgValues(D, Arg, true);
524      // Report error if user explicitly tries to disable recovery from
525      // always recoverable sanitizer.
526      if (SanitizerMask KindsToDiagnose =
527              Remove & AlwaysRecoverable & ~DiagnosedAlwaysRecoverableKinds) {
528        SanitizerSet SetToDiagnose;
529        SetToDiagnose.Mask |= KindsToDiagnose;
530        D.Diag(diag::err_drv_unsupported_option_argument)
531            << Arg->getOption().getName() << toString(SetToDiagnose);
532        DiagnosedAlwaysRecoverableKinds |= KindsToDiagnose;
533      }
534      RecoverableKinds &= ~expandSanitizerGroups(Remove);
535      Arg->claim();
536    }
537    if (DeprecatedReplacement) {
538      D.Diag(diag::warn_drv_deprecated_arg) << Arg->getAsString(Args)
539                                            << DeprecatedReplacement;
540    }
541  }
542  RecoverableKinds &= Kinds;
543  RecoverableKinds &= ~Unrecoverable;
544
545  TrappingKinds &= Kinds;
546  RecoverableKinds &= ~TrappingKinds;
547
548  // Setup blacklist files.
549  // Add default blacklist from resource directory.
550  addDefaultBlacklists(D, Kinds, BlacklistFiles);
551  // Parse -f(no-)sanitize-blacklist options.
552  for (const auto *Arg : Args) {
553    if (Arg->getOption().matches(options::OPT_fsanitize_blacklist)) {
554      Arg->claim();
555      std::string BLPath = Arg->getValue();
556      if (llvm::sys::fs::exists(BLPath)) {
557        BlacklistFiles.push_back(BLPath);
558        ExtraDeps.push_back(BLPath);
559      } else {
560        D.Diag(clang::diag::err_drv_no_such_file) << BLPath;
561      }
562    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_blacklist)) {
563      Arg->claim();
564      BlacklistFiles.clear();
565      ExtraDeps.clear();
566    }
567  }
568  // Validate blacklists format.
569  {
570    std::string BLError;
571    std::unique_ptr<llvm::SpecialCaseList> SCL(
572        llvm::SpecialCaseList::create(BlacklistFiles, BLError));
573    if (!SCL.get())
574      D.Diag(clang::diag::err_drv_malformed_sanitizer_blacklist) << BLError;
575  }
576
577  // Parse -f[no-]sanitize-memory-track-origins[=level] options.
578  if (AllAddedKinds & SanitizerKind::Memory) {
579    if (Arg *A =
580            Args.getLastArg(options::OPT_fsanitize_memory_track_origins_EQ,
581                            options::OPT_fsanitize_memory_track_origins,
582                            options::OPT_fno_sanitize_memory_track_origins)) {
583      if (A->getOption().matches(options::OPT_fsanitize_memory_track_origins)) {
584        MsanTrackOrigins = 2;
585      } else if (A->getOption().matches(
586                     options::OPT_fno_sanitize_memory_track_origins)) {
587        MsanTrackOrigins = 0;
588      } else {
589        StringRef S = A->getValue();
590        if (S.getAsInteger(0, MsanTrackOrigins) || MsanTrackOrigins < 0 ||
591            MsanTrackOrigins > 2) {
592          D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
593        }
594      }
595    }
596    MsanUseAfterDtor =
597        Args.hasFlag(options::OPT_fsanitize_memory_use_after_dtor,
598                     options::OPT_fno_sanitize_memory_use_after_dtor,
599                     MsanUseAfterDtor);
600    NeedPIE |= !(TC.getTriple().isOSLinux() &&
601                 TC.getTriple().getArch() == llvm::Triple::x86_64);
602  } else {
603    MsanUseAfterDtor = false;
604  }
605
606  if (AllAddedKinds & SanitizerKind::Thread) {
607    TsanMemoryAccess = Args.hasFlag(
608        options::OPT_fsanitize_thread_memory_access,
609        options::OPT_fno_sanitize_thread_memory_access, TsanMemoryAccess);
610    TsanFuncEntryExit = Args.hasFlag(
611        options::OPT_fsanitize_thread_func_entry_exit,
612        options::OPT_fno_sanitize_thread_func_entry_exit, TsanFuncEntryExit);
613    TsanAtomics =
614        Args.hasFlag(options::OPT_fsanitize_thread_atomics,
615                     options::OPT_fno_sanitize_thread_atomics, TsanAtomics);
616  }
617
618  if (AllAddedKinds & SanitizerKind::CFI) {
619    // Without PIE, external function address may resolve to a PLT record, which
620    // can not be verified by the target module.
621    NeedPIE |= CfiCrossDso;
622    CfiICallGeneralizePointers =
623        Args.hasArg(options::OPT_fsanitize_cfi_icall_generalize_pointers);
624
625    if (CfiCrossDso && CfiICallGeneralizePointers)
626      D.Diag(diag::err_drv_argument_not_allowed_with)
627          << "-fsanitize-cfi-cross-dso"
628          << "-fsanitize-cfi-icall-generalize-pointers";
629  }
630
631  Stats = Args.hasFlag(options::OPT_fsanitize_stats,
632                       options::OPT_fno_sanitize_stats, false);
633
634  if (MinimalRuntime) {
635    SanitizerMask IncompatibleMask =
636        Kinds & ~setGroupBits(CompatibleWithMinimalRuntime);
637    if (IncompatibleMask)
638      D.Diag(clang::diag::err_drv_argument_not_allowed_with)
639          << "-fsanitize-minimal-runtime"
640          << lastArgumentForMask(D, Args, IncompatibleMask);
641
642    SanitizerMask NonTrappingCfi = Kinds & SanitizerKind::CFI & ~TrappingKinds;
643    if (NonTrappingCfi)
644      D.Diag(clang::diag::err_drv_argument_only_allowed_with)
645          << "fsanitize-minimal-runtime"
646          << "fsanitize-trap=cfi";
647  }
648
649  // Parse -f(no-)?sanitize-coverage flags if coverage is supported by the
650  // enabled sanitizers.
651  for (const auto *Arg : Args) {
652    if (Arg->getOption().matches(options::OPT_fsanitize_coverage)) {
653      int LegacySanitizeCoverage;
654      if (Arg->getNumValues() == 1 &&
655          !StringRef(Arg->getValue(0))
656               .getAsInteger(0, LegacySanitizeCoverage)) {
657        CoverageFeatures = 0;
658        Arg->claim();
659        if (LegacySanitizeCoverage != 0) {
660          D.Diag(diag::warn_drv_deprecated_arg)
661              << Arg->getAsString(Args) << "-fsanitize-coverage=trace-pc-guard";
662        }
663        continue;
664      }
665      CoverageFeatures |= parseCoverageFeatures(D, Arg);
666
667      // Disable coverage and not claim the flags if there is at least one
668      // non-supporting sanitizer.
669      if (!(AllAddedKinds & ~AllRemove & ~setGroupBits(SupportsCoverage))) {
670        Arg->claim();
671      } else {
672        CoverageFeatures = 0;
673      }
674    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_coverage)) {
675      Arg->claim();
676      CoverageFeatures &= ~parseCoverageFeatures(D, Arg);
677    }
678  }
679  // Choose at most one coverage type: function, bb, or edge.
680  if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageBB))
681    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
682        << "-fsanitize-coverage=func"
683        << "-fsanitize-coverage=bb";
684  if ((CoverageFeatures & CoverageFunc) && (CoverageFeatures & CoverageEdge))
685    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
686        << "-fsanitize-coverage=func"
687        << "-fsanitize-coverage=edge";
688  if ((CoverageFeatures & CoverageBB) && (CoverageFeatures & CoverageEdge))
689    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
690        << "-fsanitize-coverage=bb"
691        << "-fsanitize-coverage=edge";
692  // Basic block tracing and 8-bit counters require some type of coverage
693  // enabled.
694  if (CoverageFeatures & CoverageTraceBB)
695    D.Diag(clang::diag::warn_drv_deprecated_arg)
696        << "-fsanitize-coverage=trace-bb"
697        << "-fsanitize-coverage=trace-pc-guard";
698  if (CoverageFeatures & Coverage8bitCounters)
699    D.Diag(clang::diag::warn_drv_deprecated_arg)
700        << "-fsanitize-coverage=8bit-counters"
701        << "-fsanitize-coverage=trace-pc-guard";
702
703  int InsertionPointTypes = CoverageFunc | CoverageBB | CoverageEdge;
704  int InstrumentationTypes =
705      CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters;
706  if ((CoverageFeatures & InsertionPointTypes) &&
707      !(CoverageFeatures & InstrumentationTypes)) {
708    D.Diag(clang::diag::warn_drv_deprecated_arg)
709        << "-fsanitize-coverage=[func|bb|edge]"
710        << "-fsanitize-coverage=[func|bb|edge],[trace-pc-guard|trace-pc]";
711  }
712
713  // trace-pc w/o func/bb/edge implies edge.
714  if (!(CoverageFeatures & InsertionPointTypes)) {
715    if (CoverageFeatures &
716        (CoverageTracePC | CoverageTracePCGuard | CoverageInline8bitCounters))
717      CoverageFeatures |= CoverageEdge;
718
719    if (CoverageFeatures & CoverageStackDepth)
720      CoverageFeatures |= CoverageFunc;
721  }
722
723  SharedRuntime =
724      Args.hasFlag(options::OPT_shared_libsan, options::OPT_static_libsan,
725                   TC.getTriple().isAndroid() || TC.getTriple().isOSFuchsia() ||
726                       TC.getTriple().isOSDarwin());
727
728  ImplicitCfiRuntime = TC.getTriple().isAndroid();
729
730  if (AllAddedKinds & SanitizerKind::Address) {
731    NeedPIE |= TC.getTriple().isOSFuchsia();
732    if (Arg *A =
733            Args.getLastArg(options::OPT_fsanitize_address_field_padding)) {
734        StringRef S = A->getValue();
735        // Legal values are 0 and 1, 2, but in future we may add more levels.
736        if (S.getAsInteger(0, AsanFieldPadding) || AsanFieldPadding < 0 ||
737            AsanFieldPadding > 2) {
738          D.Diag(clang::diag::err_drv_invalid_value) << A->getAsString(Args) << S;
739        }
740    }
741
742    if (Arg *WindowsDebugRTArg =
743            Args.getLastArg(options::OPT__SLASH_MTd, options::OPT__SLASH_MT,
744                            options::OPT__SLASH_MDd, options::OPT__SLASH_MD,
745                            options::OPT__SLASH_LDd, options::OPT__SLASH_LD)) {
746      switch (WindowsDebugRTArg->getOption().getID()) {
747      case options::OPT__SLASH_MTd:
748      case options::OPT__SLASH_MDd:
749      case options::OPT__SLASH_LDd:
750        D.Diag(clang::diag::err_drv_argument_not_allowed_with)
751            << WindowsDebugRTArg->getAsString(Args)
752            << lastArgumentForMask(D, Args, SanitizerKind::Address);
753        D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
754      }
755    }
756
757    AsanUseAfterScope = Args.hasFlag(
758        options::OPT_fsanitize_address_use_after_scope,
759        options::OPT_fno_sanitize_address_use_after_scope, AsanUseAfterScope);
760
761    AsanPoisonCustomArrayCookie = Args.hasFlag(
762        options::OPT_fsanitize_address_poison_custom_array_cookie,
763        options::OPT_fno_sanitize_address_poison_custom_array_cookie,
764        AsanPoisonCustomArrayCookie);
765
766    // As a workaround for a bug in gold 2.26 and earlier, dead stripping of
767    // globals in ASan is disabled by default on ELF targets.
768    // See https://sourceware.org/bugzilla/show_bug.cgi?id=19002
769    AsanGlobalsDeadStripping =
770        !TC.getTriple().isOSBinFormatELF() || TC.getTriple().isOSFuchsia() ||
771        Args.hasArg(options::OPT_fsanitize_address_globals_dead_stripping);
772
773    AsanUseOdrIndicator =
774        Args.hasFlag(options::OPT_fsanitize_address_use_odr_indicator,
775                     options::OPT_fno_sanitize_address_use_odr_indicator,
776                     AsanUseOdrIndicator);
777  } else {
778    AsanUseAfterScope = false;
779  }
780
781  if (AllAddedKinds & SanitizerKind::HWAddress) {
782    if (Arg *HwasanAbiArg =
783            Args.getLastArg(options::OPT_fsanitize_hwaddress_abi_EQ)) {
784      HwasanAbi = HwasanAbiArg->getValue();
785      if (HwasanAbi != "platform" && HwasanAbi != "interceptor")
786        D.Diag(clang::diag::err_drv_invalid_value)
787            << HwasanAbiArg->getAsString(Args) << HwasanAbi;
788    } else {
789      HwasanAbi = "interceptor";
790    }
791  }
792
793  if (AllAddedKinds & SanitizerKind::SafeStack) {
794    // SafeStack runtime is built into the system on Fuchsia.
795    SafeStackRuntime = !TC.getTriple().isOSFuchsia();
796  }
797
798  // Parse -link-cxx-sanitizer flag.
799  LinkCXXRuntimes =
800      Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();
801
802  // Finally, initialize the set of available and recoverable sanitizers.
803  Sanitizers.Mask |= Kinds;
804  RecoverableSanitizers.Mask |= RecoverableKinds;
805  TrapSanitizers.Mask |= TrappingKinds;
806   (0) . __assert_fail ("!(RecoverableKinds & TrappingKinds) && \"Overlap between recoverable and trapping sanitizers\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 807, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(!(RecoverableKinds & TrappingKinds) &&
807 (0) . __assert_fail ("!(RecoverableKinds & TrappingKinds) && \"Overlap between recoverable and trapping sanitizers\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 807, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "Overlap between recoverable and trapping sanitizers");
808}
809
810static std::string toString(const clang::SanitizerSet &Sanitizers) {
811  std::string Res;
812#define SANITIZER(NAME, ID)                                                    \
813  if (Sanitizers.has(SanitizerKind::ID)) {                                     \
814    if (!Res.empty())                                                          \
815      Res += ",";                                                              \
816    Res += NAME;                                                               \
817  }
818#include "clang/Basic/Sanitizers.def"
819  return Res;
820}
821
822static void addIncludeLinkerOption(const ToolChain &TC,
823                                   const llvm::opt::ArgList &Args,
824                                   llvm::opt::ArgStringList &CmdArgs,
825                                   StringRef SymbolName) {
826  SmallString<64> LinkerOptionFlag;
827  LinkerOptionFlag = "--linker-option=/include:";
828  if (TC.getTriple().getArch() == llvm::Triple::x86) {
829    // Win32 mangles C function names with a '_' prefix.
830    LinkerOptionFlag += '_';
831  }
832  LinkerOptionFlag += SymbolName;
833  CmdArgs.push_back(Args.MakeArgString(LinkerOptionFlag));
834}
835
836void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
837                            llvm::opt::ArgStringList &CmdArgs,
838                            types::ID InputType) const {
839  // NVPTX doesn't currently support sanitizers.  Bailing out here means that
840  // e.g. -fsanitize=address applies only to host code, which is what we want
841  // for now.
842  if (TC.getTriple().isNVPTX())
843    return;
844
845  // Translate available CoverageFeatures to corresponding clang-cc1 flags.
846  // Do it even if Sanitizers.empty() since some forms of coverage don't require
847  // sanitizers.
848  std::pair<int, const char *> CoverageFlags[] = {
849    std::make_pair(CoverageFunc, "-fsanitize-coverage-type=1"),
850    std::make_pair(CoverageBB, "-fsanitize-coverage-type=2"),
851    std::make_pair(CoverageEdge, "-fsanitize-coverage-type=3"),
852    std::make_pair(CoverageIndirCall, "-fsanitize-coverage-indirect-calls"),
853    std::make_pair(CoverageTraceBB, "-fsanitize-coverage-trace-bb"),
854    std::make_pair(CoverageTraceCmp, "-fsanitize-coverage-trace-cmp"),
855    std::make_pair(CoverageTraceDiv, "-fsanitize-coverage-trace-div"),
856    std::make_pair(CoverageTraceGep, "-fsanitize-coverage-trace-gep"),
857    std::make_pair(Coverage8bitCounters, "-fsanitize-coverage-8bit-counters"),
858    std::make_pair(CoverageTracePC, "-fsanitize-coverage-trace-pc"),
859    std::make_pair(CoverageTracePCGuard, "-fsanitize-coverage-trace-pc-guard"),
860    std::make_pair(CoverageInline8bitCounters, "-fsanitize-coverage-inline-8bit-counters"),
861    std::make_pair(CoveragePCTable, "-fsanitize-coverage-pc-table"),
862    std::make_pair(CoverageNoPrune, "-fsanitize-coverage-no-prune"),
863    std::make_pair(CoverageStackDepth, "-fsanitize-coverage-stack-depth")};
864  for (auto F : CoverageFlags) {
865    if (CoverageFeatures & F.first)
866      CmdArgs.push_back(F.second);
867  }
868
869  if (TC.getTriple().isOSWindows() && needsUbsanRt()) {
870    // Instruct the code generator to embed linker directives in the object file
871    // that cause the required runtime libraries to be linked.
872    CmdArgs.push_back(Args.MakeArgString(
873        "--dependent-lib=" + TC.getCompilerRT(Args, "ubsan_standalone")));
874    if (types::isCXX(InputType))
875      CmdArgs.push_back(Args.MakeArgString(
876          "--dependent-lib=" + TC.getCompilerRT(Args, "ubsan_standalone_cxx")));
877  }
878  if (TC.getTriple().isOSWindows() && needsStatsRt()) {
879    CmdArgs.push_back(Args.MakeArgString("--dependent-lib=" +
880                                         TC.getCompilerRT(Args, "stats_client")));
881
882    // The main executable must export the stats runtime.
883    // FIXME: Only exporting from the main executable (e.g. based on whether the
884    // translation unit defines main()) would save a little space, but having
885    // multiple copies of the runtime shouldn't hurt.
886    CmdArgs.push_back(Args.MakeArgString("--dependent-lib=" +
887                                         TC.getCompilerRT(Args, "stats")));
888    addIncludeLinkerOption(TC, Args, CmdArgs, "__sanitizer_stats_register");
889  }
890
891  if (Sanitizers.empty())
892    return;
893  CmdArgs.push_back(Args.MakeArgString("-fsanitize=" + toString(Sanitizers)));
894
895  if (!RecoverableSanitizers.empty())
896    CmdArgs.push_back(Args.MakeArgString("-fsanitize-recover=" +
897                                         toString(RecoverableSanitizers)));
898
899  if (!TrapSanitizers.empty())
900    CmdArgs.push_back(
901        Args.MakeArgString("-fsanitize-trap=" + toString(TrapSanitizers)));
902
903  for (const auto &BLPath : BlacklistFiles) {
904    SmallString<64> BlacklistOpt("-fsanitize-blacklist=");
905    BlacklistOpt += BLPath;
906    CmdArgs.push_back(Args.MakeArgString(BlacklistOpt));
907  }
908  for (const auto &Dep : ExtraDeps) {
909    SmallString<64> ExtraDepOpt("-fdepfile-entry=");
910    ExtraDepOpt += Dep;
911    CmdArgs.push_back(Args.MakeArgString(ExtraDepOpt));
912  }
913
914  if (MsanTrackOrigins)
915    CmdArgs.push_back(Args.MakeArgString("-fsanitize-memory-track-origins=" +
916                                         Twine(MsanTrackOrigins)));
917
918  if (MsanUseAfterDtor)
919    CmdArgs.push_back("-fsanitize-memory-use-after-dtor");
920
921  // FIXME: Pass these parameters as function attributes, not as -llvm flags.
922  if (!TsanMemoryAccess) {
923    CmdArgs.push_back("-mllvm");
924    CmdArgs.push_back("-tsan-instrument-memory-accesses=0");
925    CmdArgs.push_back("-mllvm");
926    CmdArgs.push_back("-tsan-instrument-memintrinsics=0");
927  }
928  if (!TsanFuncEntryExit) {
929    CmdArgs.push_back("-mllvm");
930    CmdArgs.push_back("-tsan-instrument-func-entry-exit=0");
931  }
932  if (!TsanAtomics) {
933    CmdArgs.push_back("-mllvm");
934    CmdArgs.push_back("-tsan-instrument-atomics=0");
935  }
936
937  if (CfiCrossDso)
938    CmdArgs.push_back("-fsanitize-cfi-cross-dso");
939
940  if (CfiICallGeneralizePointers)
941    CmdArgs.push_back("-fsanitize-cfi-icall-generalize-pointers");
942
943  if (Stats)
944    CmdArgs.push_back("-fsanitize-stats");
945
946  if (MinimalRuntime)
947    CmdArgs.push_back("-fsanitize-minimal-runtime");
948
949  if (AsanFieldPadding)
950    CmdArgs.push_back(Args.MakeArgString("-fsanitize-address-field-padding=" +
951                                         Twine(AsanFieldPadding)));
952
953  if (AsanUseAfterScope)
954    CmdArgs.push_back("-fsanitize-address-use-after-scope");
955
956  if (AsanPoisonCustomArrayCookie)
957    CmdArgs.push_back("-fsanitize-address-poison-custom-array-cookie");
958
959  if (AsanGlobalsDeadStripping)
960    CmdArgs.push_back("-fsanitize-address-globals-dead-stripping");
961
962  if (AsanUseOdrIndicator)
963    CmdArgs.push_back("-fsanitize-address-use-odr-indicator");
964
965  if (!HwasanAbi.empty()) {
966    CmdArgs.push_back("-default-function-attr");
967    CmdArgs.push_back(Args.MakeArgString("hwasan-abi=" + HwasanAbi));
968  }
969
970  // MSan: Workaround for PR16386.
971  // ASan: This is mainly to help LSan with cases such as
972  // https://github.com/google/sanitizers/issues/373
973  // We can't make this conditional on -fsanitize=leak, as that flag shouldn't
974  // affect compilation.
975  if (Sanitizers.has(SanitizerKind::Memory) ||
976      Sanitizers.has(SanitizerKind::Address))
977    CmdArgs.push_back("-fno-assume-sane-operator-new");
978
979  // Require -fvisibility= flag on non-Windows when compiling if vptr CFI is
980  // enabled.
981  if (Sanitizers.hasOneOf(CFIClasses) && !TC.getTriple().isOSWindows() &&
982      !Args.hasArg(options::OPT_fvisibility_EQ)) {
983    TC.getDriver().Diag(clang::diag::err_drv_argument_only_allowed_with)
984        << lastArgumentForMask(TC.getDriver(), Args,
985                               Sanitizers.Mask & CFIClasses)
986        << "-fvisibility=";
987  }
988}
989
990SanitizerMask parseArgValues(const Driver &D, const llvm::opt::Arg *A,
991                             bool DiagnoseErrors) {
992   (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert((A->getOption().matches(options::OPT_fsanitize_EQ) ||
993 (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">          A->getOption().matches(options::OPT_fno_sanitize_EQ) ||
994 (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">          A->getOption().matches(options::OPT_fsanitize_recover_EQ) ||
995 (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">          A->getOption().matches(options::OPT_fno_sanitize_recover_EQ) ||
996 (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">          A->getOption().matches(options::OPT_fsanitize_trap_EQ) ||
997 (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">          A->getOption().matches(options::OPT_fno_sanitize_trap_EQ)) &&
998 (0) . __assert_fail ("(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)) && \"Invalid argument in parseArgValues!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 998, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         "Invalid argument in parseArgValues!");
999  SanitizerMask Kinds;
1000  for (int i = 0, n = A->getNumValues(); i != n; ++i) {
1001    const char *Value = A->getValue(i);
1002    SanitizerMask Kind;
1003    // Special case: don't accept -fsanitize=all.
1004    if (A->getOption().matches(options::OPT_fsanitize_EQ) &&
1005        0 == strcmp("all", Value))
1006      Kind = SanitizerMask();
1007    else
1008      Kind = parseSanitizerValue(Value, /*AllowGroups=*/true);
1009
1010    if (Kind)
1011      Kinds |= Kind;
1012    else if (DiagnoseErrors)
1013      D.Diag(clang::diag::err_drv_unsupported_option_argument)
1014          << A->getOption().getName() << Value;
1015  }
1016  return Kinds;
1017}
1018
1019int parseCoverageFeatures(const Driver &D, const llvm::opt::Arg *A) {
1020  getOption().matches(options..OPT_fsanitize_coverage) || A->getOption().matches(options..OPT_fno_sanitize_coverage)", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 1021, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(A->getOption().matches(options::OPT_fsanitize_coverage) ||
1021getOption().matches(options..OPT_fsanitize_coverage) || A->getOption().matches(options..OPT_fno_sanitize_coverage)", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 1021, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         A->getOption().matches(options::OPT_fno_sanitize_coverage));
1022  int Features = 0;
1023  for (int i = 0, n = A->getNumValues(); i != n; ++i) {
1024    const char *Value = A->getValue(i);
1025    int F = llvm::StringSwitch<int>(Value)
1026        .Case("func", CoverageFunc)
1027        .Case("bb", CoverageBB)
1028        .Case("edge", CoverageEdge)
1029        .Case("indirect-calls", CoverageIndirCall)
1030        .Case("trace-bb", CoverageTraceBB)
1031        .Case("trace-cmp", CoverageTraceCmp)
1032        .Case("trace-div", CoverageTraceDiv)
1033        .Case("trace-gep", CoverageTraceGep)
1034        .Case("8bit-counters", Coverage8bitCounters)
1035        .Case("trace-pc", CoverageTracePC)
1036        .Case("trace-pc-guard", CoverageTracePCGuard)
1037        .Case("no-prune", CoverageNoPrune)
1038        .Case("inline-8bit-counters", CoverageInline8bitCounters)
1039        .Case("pc-table", CoveragePCTable)
1040        .Case("stack-depth", CoverageStackDepth)
1041        .Default(0);
1042    if (F == 0)
1043      D.Diag(clang::diag::err_drv_unsupported_option_argument)
1044          << A->getOption().getName() << Value;
1045    Features |= F;
1046  }
1047  return Features;
1048}
1049
1050std::string lastArgumentForMask(const Driver &D, const llvm::opt::ArgList &Args,
1051                                SanitizerMask Mask) {
1052  for (llvm::opt::ArgList::const_reverse_iterator I = Args.rbegin(),
1053                                                  E = Args.rend();
1054       I != E; ++I) {
1055    const auto *Arg = *I;
1056    if (Arg->getOption().matches(options::OPT_fsanitize_EQ)) {
1057      SanitizerMask AddKinds =
1058          expandSanitizerGroups(parseArgValues(D, Arg, false));
1059      if (AddKinds & Mask)
1060        return describeSanitizeArg(Arg, Mask);
1061    } else if (Arg->getOption().matches(options::OPT_fno_sanitize_EQ)) {
1062      SanitizerMask RemoveKinds =
1063          expandSanitizerGroups(parseArgValues(D, Arg, false));
1064      Mask &= ~RemoveKinds;
1065    }
1066  }
1067  llvm_unreachable("arg list didn't provide expected value");
1068}
1069
1070std::string describeSanitizeArg(const llvm::opt::Arg *A, SanitizerMask Mask) {
1071   (0) . __assert_fail ("A->getOption().matches(options..OPT_fsanitize_EQ) && \"Invalid argument in describeSanitizerArg!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 1072, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(A->getOption().matches(options::OPT_fsanitize_EQ)
1072 (0) . __assert_fail ("A->getOption().matches(options..OPT_fsanitize_EQ) && \"Invalid argument in describeSanitizerArg!\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 1072, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">         && "Invalid argument in describeSanitizerArg!");
1073
1074  std::string Sanitizers;
1075  for (int i = 0, n = A->getNumValues(); i != n; ++i) {
1076    if (expandSanitizerGroups(
1077            parseSanitizerValue(A->getValue(i), /*AllowGroups=*/true)) &
1078        Mask) {
1079      if (!Sanitizers.empty())
1080        Sanitizers += ",";
1081      Sanitizers += A->getValue(i);
1082    }
1083  }
1084
1085   (0) . __assert_fail ("!Sanitizers.empty() && \"arg didn't provide expected value\"", "/home/seafit/code_projects/clang_source/clang/lib/Driver/SanitizerArgs.cpp", 1085, __PRETTY_FUNCTION__))" file_link="../../../include/assert.h.html#88" macro="true">assert(!Sanitizers.empty() && "arg didn't provide expected value");
1086  return "-fsanitize=" + Sanitizers;
1087}
1088
clang::driver::SanitizerArgs::needsUbsanRt
clang::driver::SanitizerArgs::needsCfiRt
clang::driver::SanitizerArgs::needsCfiDiagRt
clang::driver::SanitizerArgs::requiresPIE
clang::driver::SanitizerArgs::needsUnwindTables
clang::driver::SanitizerArgs::needsLTO
clang::driver::SanitizerArgs::addArgs
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