clang/tools/driver/driver.cpp

   1 //===-- driver.cpp - Clang GCC-Compatible Driver --------------------------===//
   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 //
   9 // This is the entry point to the clang driver; it is a thin wrapper
  10 // for functionality in the Driver clang library.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Driver/Driver.h"
  15 #include "clang/Basic/DiagnosticOptions.h"
  16 #include "clang/Basic/HeaderInclude.h"
  17 #include "clang/Basic/Stack.h"
  18 #include "clang/Config/config.h"
  19 #include "clang/Driver/Compilation.h"
  20 #include "clang/Driver/DriverDiagnostic.h"
  21 #include "clang/Driver/Options.h"
  22 #include "clang/Driver/ToolChain.h"
  23 #include "clang/Frontend/ChainedDiagnosticConsumer.h"
  24 #include "clang/Frontend/CompilerInvocation.h"
  25 #include "clang/Frontend/SerializedDiagnosticPrinter.h"
  26 #include "clang/Frontend/TextDiagnosticPrinter.h"
  27 #include "clang/Frontend/Utils.h"
  28 #include "llvm/ADT/ArrayRef.h"
  29 #include "llvm/ADT/SmallString.h"
  30 #include "llvm/ADT/SmallVector.h"
  31 #include "llvm/Option/ArgList.h"
  32 #include "llvm/Option/OptTable.h"
  33 #include "llvm/Option/Option.h"
  34 #include "llvm/Support/BuryPointer.h"
  35 #include "llvm/Support/CommandLine.h"
  36 #include "llvm/Support/CrashRecoveryContext.h"
  37 #include "llvm/Support/ErrorHandling.h"
  38 #include "llvm/Support/FileSystem.h"
  39 #include "llvm/Support/InitLLVM.h"
  40 #include "llvm/Support/LLVMDriver.h"
  41 #include "llvm/Support/Path.h"
  42 #include "llvm/Support/PrettyStackTrace.h"
  43 #include "llvm/Support/Process.h"
  44 #include "llvm/Support/Program.h"
  45 #include "llvm/Support/Regex.h"
  46 #include "llvm/Support/Signals.h"
  47 #include "llvm/Support/StringSaver.h"
  48 #include "llvm/Support/TargetSelect.h"
  49 #include "llvm/Support/Timer.h"
  50 #include "llvm/Support/raw_ostream.h"
  51 #include "llvm/TargetParser/Host.h"
  52 #include <memory>
  53 #include <optional>
  54 #include <set>
  55 #include <system_error>
  56 using namespace clang;
  57 using namespace clang::driver;
  58 using namespace llvm::opt;
  59
  60 std::string GetExecutablePath(const char *Argv0, bool CanonicalPrefixes) {
  61   if (!CanonicalPrefixes) {
  62     SmallString<128> ExecutablePath(Argv0);
  63     // Do a PATH lookup if Argv0 isn't a valid path.
  64     if (!llvm::sys::fs::exists(ExecutablePath))
  65       if (llvm::ErrorOr<std::string> P =
  66               llvm::sys::findProgramByName(ExecutablePath))
  67         ExecutablePath = *P;
  68     return std::string(ExecutablePath.str());
  69   }
  70
  71   // This just needs to be some symbol in the binary; C++ doesn't
  72   // allow taking the address of ::main however.
  73   void *P = (void*) (intptr_t) GetExecutablePath;
  74   return llvm::sys::fs::getMainExecutable(Argv0, P);
  75 }
  76
  77 static const char *GetStableCStr(std::set<std::string> &SavedStrings,
  78                                  StringRef S) {
  79   return SavedStrings.insert(std::string(S)).first->c_str();
  80 }
  81
  82 /// ApplyOneQAOverride - Apply a list of edits to the input argument lists.
  83 ///
  84 /// The input string is a space separated list of edits to perform,
  85 /// they are applied in order to the input argument lists. Edits
  86 /// should be one of the following forms:
  87 ///
  88 ///  '#': Silence information about the changes to the command line arguments.
  89 ///
  90 ///  '^': Add FOO as a new argument at the beginning of the command line.
  91 ///
  92 ///  '+': Add FOO as a new argument at the end of the command line.
  93 ///
  94 ///  's/XXX/YYY/': Substitute the regular expression XXX with YYY in the command
  95 ///  line.
  96 ///
  97 ///  'xOPTION': Removes all instances of the literal argument OPTION.
  98 ///
  99 ///  'XOPTION': Removes all instances of the literal argument OPTION,
 100 ///  and the following argument.
 101 ///
 102 ///  'Ox': Removes all flags matching 'O' or 'O[sz0-9]' and adds 'Ox'
 103 ///  at the end of the command line.
 104 ///
 105 /// \param OS - The stream to write edit information to.
 106 /// \param Args - The vector of command line arguments.
 107 /// \param Edit - The override command to perform.
 108 /// \param SavedStrings - Set to use for storing string representations.
 109 static void ApplyOneQAOverride(raw_ostream &OS,
 110                                SmallVectorImpl<const char*> &Args,
 111                                StringRef Edit,
 112                                std::set<std::string> &SavedStrings) {
 113   // This does not need to be efficient.
 114
 115   if (Edit[0] == '^') {
 116     const char *Str =
 117       GetStableCStr(SavedStrings, Edit.substr(1));
 118     OS << "### Adding argument " << Str << " at beginning\n";
 119     Args.insert(Args.begin() + 1, Str);
 120   } else if (Edit[0] == '+') {
 121     const char *Str =
 122       GetStableCStr(SavedStrings, Edit.substr(1));
 123     OS << "### Adding argument " << Str << " at end\n";
 124     Args.push_back(Str);
 125   } else if (Edit[0] == 's' && Edit[1] == '/' && Edit.endswith("/") &&
 126              Edit.slice(2, Edit.size() - 1).contains('/')) {
 127     StringRef MatchPattern = Edit.substr(2).split('/').first;
 128     StringRef ReplPattern = Edit.substr(2).split('/').second;
 129     ReplPattern = ReplPattern.slice(0, ReplPattern.size()-1);
 130
 131     for (unsigned i = 1, e = Args.size(); i != e; ++i) {
 132       // Ignore end-of-line response file markers
 133       if (Args[i] == nullptr)
 134         continue;
 135       std::string Repl = llvm::Regex(MatchPattern).sub(ReplPattern, Args[i]);
 136
 137       if (Repl != Args[i]) {
 138         OS << "### Replacing '" << Args[i] << "' with '" << Repl << "'\n";
 139         Args[i] = GetStableCStr(SavedStrings, Repl);
 140       }
 141     }
 142   } else if (Edit[0] == 'x' || Edit[0] == 'X') {
 143     auto Option = Edit.substr(1);
 144     for (unsigned i = 1; i < Args.size();) {
 145       if (Option == Args[i]) {
 146         OS << "### Deleting argument " << Args[i] << '\n';
 147         Args.erase(Args.begin() + i);
 148         if (Edit[0] == 'X') {
 149           if (i < Args.size()) {
 150             OS << "### Deleting argument " << Args[i] << '\n';
 151             Args.erase(Args.begin() + i);
 152           } else
 153             OS << "### Invalid X edit, end of command line!\n";
 154         }
 155       } else
 156         ++i;
 157     }
 158   } else if (Edit[0] == 'O') {
 159     for (unsigned i = 1; i < Args.size();) {
 160       const char *A = Args[i];
 161       // Ignore end-of-line response file markers
 162       if (A == nullptr)
 163         continue;
 164       if (A[0] == '-' && A[1] == 'O' &&
 165           (A[2] == '\0' ||
 166            (A[3] == '\0' && (A[2] == 's' || A[2] == 'z' ||
 167                              ('0' <= A[2] && A[2] <= '9'))))) {
 168         OS << "### Deleting argument " << Args[i] << '\n';
 169         Args.erase(Args.begin() + i);
 170       } else
 171         ++i;
 172     }
 173     OS << "### Adding argument " << Edit << " at end\n";
 174     Args.push_back(GetStableCStr(SavedStrings, '-' + Edit.str()));
 175   } else {
 176     OS << "### Unrecognized edit: " << Edit << "\n";
 177   }
 178 }
 179
 180 /// ApplyQAOverride - Apply a space separated list of edits to the
 181 /// input argument lists. See ApplyOneQAOverride.
 182 static void ApplyQAOverride(SmallVectorImpl<const char*> &Args,
 183                             const char *OverrideStr,
 184                             std::set<std::string> &SavedStrings) {
 185   raw_ostream *OS = &llvm::errs();
 186
 187   if (OverrideStr[0] == '#') {
 188     ++OverrideStr;
 189     OS = &llvm::nulls();
 190   }
 191
 192   *OS << "### CCC_OVERRIDE_OPTIONS: " << OverrideStr << "\n";
 193
 194   // This does not need to be efficient.
 195
 196   const char *S = OverrideStr;
 197   while (*S) {
 198     const char *End = ::strchr(S, ' ');
 199     if (!End)
 200       End = S + strlen(S);
 201     if (End != S)
 202       ApplyOneQAOverride(*OS, Args, std::string(S, End), SavedStrings);
 203     S = End;
 204     if (*S != '\0')
 205       ++S;
 206   }
 207 }
 208
 209 extern int cc1_main(ArrayRef<const char *> Argv, const char *Argv0,
 210                     void *MainAddr);
 211 extern int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0,
 212                       void *MainAddr);
 213 extern int cc1gen_reproducer_main(ArrayRef<const char *> Argv,
 214                                   const char *Argv0, void *MainAddr,
 215                                   const llvm::ToolContext &);
 216
 217 static void insertTargetAndModeArgs(const ParsedClangName &NameParts,
 218                                     SmallVectorImpl<const char *> &ArgVector,
 219                                     std::set<std::string> &SavedStrings) {
 220   // Put target and mode arguments at the start of argument list so that
 221   // arguments specified in command line could override them. Avoid putting
 222   // them at index 0, as an option like '-cc1' must remain the first.
 223   int InsertionPoint = 0;
 224   if (ArgVector.size() > 0)
 225     ++InsertionPoint;
 226
 227   if (NameParts.DriverMode) {
 228     // Add the mode flag to the arguments.
 229     ArgVector.insert(ArgVector.begin() + InsertionPoint,
 230                      GetStableCStr(SavedStrings, NameParts.DriverMode));
 231   }
 232
 233   if (NameParts.TargetIsValid) {
 234     const char *arr[] = {"-target", GetStableCStr(SavedStrings,
 235                                                   NameParts.TargetPrefix)};
 236     ArgVector.insert(ArgVector.begin() + InsertionPoint,
 237                      std::begin(arr), std::end(arr));
 238   }
 239 }
 240
 241 static void getCLEnvVarOptions(std::string &EnvValue, llvm::StringSaver &Saver,
 242                                SmallVectorImpl<const char *> &Opts) {
 243   llvm::cl::TokenizeWindowsCommandLine(EnvValue, Saver, Opts);
 244   // The first instance of '#' should be replaced with '=' in each option.
 245   for (const char *Opt : Opts)
 246     if (char *NumberSignPtr = const_cast<char *>(::strchr(Opt, '#')))
 247       *NumberSignPtr = '=';
 248 }
 249
 250 template <class T>
 251 static T checkEnvVar(const char *EnvOptSet, const char *EnvOptFile,
 252                      std::string &OptFile) {
 253   const char *Str = ::getenv(EnvOptSet);
 254   if (!Str)
 255     return T{};
 256
 257   T OptVal = Str;
 258   if (const char *Var = ::getenv(EnvOptFile))
 259     OptFile = Var;
 260   return OptVal;
 261 }
 262
 263 static bool SetBackdoorDriverOutputsFromEnvVars(Driver &TheDriver) {
 264   TheDriver.CCPrintOptions =
 265       checkEnvVar<bool>("CC_PRINT_OPTIONS", "CC_PRINT_OPTIONS_FILE",
 266                         TheDriver.CCPrintOptionsFilename);
 267   if (checkEnvVar<bool>("CC_PRINT_HEADERS", "CC_PRINT_HEADERS_FILE",
 268                         TheDriver.CCPrintHeadersFilename)) {
 269     TheDriver.CCPrintHeadersFormat = HIFMT_Textual;
 270     TheDriver.CCPrintHeadersFiltering = HIFIL_None;
 271   } else {
 272     std::string EnvVar = checkEnvVar<std::string>(
 273         "CC_PRINT_HEADERS_FORMAT", "CC_PRINT_HEADERS_FILE",
 274         TheDriver.CCPrintHeadersFilename);
 275     if (!EnvVar.empty()) {
 276       TheDriver.CCPrintHeadersFormat =
 277           stringToHeaderIncludeFormatKind(EnvVar.c_str());
 278       if (!TheDriver.CCPrintHeadersFormat) {
 279         TheDriver.Diag(clang::diag::err_drv_print_header_env_var)
 280             << 0 << EnvVar;
 281         return false;
 282       }
 283
 284       const char *FilteringStr = ::getenv("CC_PRINT_HEADERS_FILTERING");
 285       HeaderIncludeFilteringKind Filtering;
 286       if (!stringToHeaderIncludeFiltering(FilteringStr, Filtering)) {
 287         TheDriver.Diag(clang::diag::err_drv_print_header_env_var)
 288             << 1 << FilteringStr;
 289         return false;
 290       }
 291
 292       if ((TheDriver.CCPrintHeadersFormat == HIFMT_Textual &&
 293            Filtering != HIFIL_None) ||
 294           (TheDriver.CCPrintHeadersFormat == HIFMT_JSON &&
 295            Filtering != HIFIL_Only_Direct_System)) {
 296         TheDriver.Diag(clang::diag::err_drv_print_header_env_var_combination)
 297             << EnvVar << FilteringStr;
 298         return false;
 299       }
 300       TheDriver.CCPrintHeadersFiltering = Filtering;
 301     }
 302   }
 303
 304   TheDriver.CCLogDiagnostics =
 305       checkEnvVar<bool>("CC_LOG_DIAGNOSTICS", "CC_LOG_DIAGNOSTICS_FILE",
 306                         TheDriver.CCLogDiagnosticsFilename);
 307   TheDriver.CCPrintProcessStats =
 308       checkEnvVar<bool>("CC_PRINT_PROC_STAT", "CC_PRINT_PROC_STAT_FILE",
 309                         TheDriver.CCPrintStatReportFilename);
 310   TheDriver.CCPrintInternalStats =
 311       checkEnvVar<bool>("CC_PRINT_INTERNAL_STAT", "CC_PRINT_INTERNAL_STAT_FILE",
 312                         TheDriver.CCPrintInternalStatReportFilename);
 313
 314   return true;
 315 }
 316
 317 static void FixupDiagPrefixExeName(TextDiagnosticPrinter *DiagClient,
 318                                    const std::string &Path) {
 319   // If the clang binary happens to be named cl.exe for compatibility reasons,
 320   // use clang-cl.exe as the prefix to avoid confusion between clang and MSVC.
 321   StringRef ExeBasename(llvm::sys::path::stem(Path));
 322   if (ExeBasename.equals_insensitive("cl"))
 323     ExeBasename = "clang-cl";
 324   DiagClient->setPrefix(std::string(ExeBasename));
 325 }
 326
 327 static void SetInstallDir(SmallVectorImpl<const char *> &argv,
 328                           Driver &TheDriver, bool CanonicalPrefixes) {
 329   // Attempt to find the original path used to invoke the driver, to determine
 330   // the installed path. We do this manually, because we want to support that
 331   // path being a symlink.
 332   SmallString<128> InstalledPath(argv[0]);
 333
 334   // Do a PATH lookup, if there are no directory components.
 335   if (llvm::sys::path::filename(InstalledPath) == InstalledPath)
 336     if (llvm::ErrorOr<std::string> Tmp = llvm::sys::findProgramByName(
 337             llvm::sys::path::filename(InstalledPath.str())))
 338       InstalledPath = *Tmp;
 339
 340   // FIXME: We don't actually canonicalize this, we just make it absolute.
 341   if (CanonicalPrefixes)
 342     llvm::sys::fs::make_absolute(InstalledPath);
 343
 344   StringRef InstalledPathParent(llvm::sys::path::parent_path(InstalledPath));
 345   if (llvm::sys::fs::exists(InstalledPathParent))
 346     TheDriver.setInstalledDir(InstalledPathParent);
 347 }
 348
 349 static int ExecuteCC1Tool(SmallVectorImpl<const char *> &ArgV,
 350                           const llvm::ToolContext &ToolContext) {
 351   // If we call the cc1 tool from the clangDriver library (through
 352   // Driver::CC1Main), we need to clean up the options usage count. The options
 353   // are currently global, and they might have been used previously by the
 354   // driver.
 355   llvm::cl::ResetAllOptionOccurrences();
 356
 357   llvm::BumpPtrAllocator A;
 358   llvm::cl::ExpansionContext ECtx(A, llvm::cl::TokenizeGNUCommandLine);
 359   if (llvm::Error Err = ECtx.expandResponseFiles(ArgV)) {
 360     llvm::errs() << toString(std::move(Err)) << '\n';
 361     return 1;
 362   }
 363   StringRef Tool = ArgV[1];
 364   void *GetExecutablePathVP = (void *)(intptr_t)GetExecutablePath;
 365   if (Tool == "-cc1")
 366     return cc1_main(ArrayRef(ArgV).slice(1), ArgV[0], GetExecutablePathVP);
 367   if (Tool == "-cc1as")
 368     return cc1as_main(ArrayRef(ArgV).slice(2), ArgV[0], GetExecutablePathVP);
 369   if (Tool == "-cc1gen-reproducer")
 370     return cc1gen_reproducer_main(ArrayRef(ArgV).slice(2), ArgV[0],
 371                                   GetExecutablePathVP, ToolContext);
 372   // Reject unknown tools.
 373   llvm::errs() << "error: unknown integrated tool '" << Tool << "'. "
 374                << "Valid tools include '-cc1' and '-cc1as'.\n";
 375   return 1;
 376 }
 377
 378 int clang_main(int Argc, char **Argv, const llvm::ToolContext &ToolContext) {
 379   noteBottomOfStack();
 380   llvm::InitLLVM X(Argc, Argv);
 381   llvm::setBugReportMsg("PLEASE submit a bug report to " BUG_REPORT_URL
 382                         " and include the crash backtrace, preprocessed "
 383                         "source, and associated run script.\n");
 384   SmallVector<const char *, 256> Args(Argv, Argv + Argc);
 385
 386   if (llvm::sys::Process::FixupStandardFileDescriptors())
 387     return 1;
 388
 389   llvm::InitializeAllTargets();
 390
 391   llvm::BumpPtrAllocator A;
 392   llvm::StringSaver Saver(A);
 393
 394   const char *ProgName =
 395       ToolContext.NeedsPrependArg ? ToolContext.PrependArg : ToolContext.Path;
 396
 397   bool ClangCLMode =
 398       IsClangCL(getDriverMode(ProgName, llvm::ArrayRef(Args).slice(1)));
 399
 400   if (llvm::Error Err = expandResponseFiles(Args, ClangCLMode, A)) {
 401     llvm::errs() << toString(std::move(Err)) << '\n';
 402     return 1;
 403   }
 404
 405   // Handle -cc1 integrated tools.
 406   if (Args.size() >= 2 && StringRef(Args[1]).startswith("-cc1"))
 407     return ExecuteCC1Tool(Args, ToolContext);
 408
 409   // Handle options that need handling before the real command line parsing in
 410   // Driver::BuildCompilation()
 411   bool CanonicalPrefixes = true;
 412   for (int i = 1, size = Args.size(); i < size; ++i) {
 413     // Skip end-of-line response file markers
 414     if (Args[i] == nullptr)
 415       continue;
 416     if (StringRef(Args[i]) == "-canonical-prefixes")
 417       CanonicalPrefixes = true;
 418     else if (StringRef(Args[i]) == "-no-canonical-prefixes")
 419       CanonicalPrefixes = false;
 420   }
 421
 422   // Handle CL and _CL_ which permits additional command line options to be
 423   // prepended or appended.
 424   if (ClangCLMode) {
 425     // Arguments in "CL" are prepended.
 426     std::optional<std::string> OptCL = llvm::sys::Process::GetEnv("CL");
 427     if (OptCL) {
 428       SmallVector<const char *, 8> PrependedOpts;
 429       getCLEnvVarOptions(*OptCL, Saver, PrependedOpts);
 430
 431       // Insert right after the program name to prepend to the argument list.
 432       Args.insert(Args.begin() + 1, PrependedOpts.begin(), PrependedOpts.end());
 433     }
 434     // Arguments in "_CL_" are appended.
 435     std::optional<std::string> Opt_CL_ = llvm::sys::Process::GetEnv("_CL_");
 436     if (Opt_CL_) {
 437       SmallVector<const char *, 8> AppendedOpts;
 438       getCLEnvVarOptions(*Opt_CL_, Saver, AppendedOpts);
 439
 440       // Insert at the end of the argument list to append.
 441       Args.append(AppendedOpts.begin(), AppendedOpts.end());
 442     }
 443   }
 444
 445   std::set<std::string> SavedStrings;
 446   // Handle CCC_OVERRIDE_OPTIONS, used for editing a command line behind the
 447   // scenes.
 448   if (const char *OverrideStr = ::getenv("CCC_OVERRIDE_OPTIONS")) {
 449     // FIXME: Driver shouldn't take extra initial argument.
 450     ApplyQAOverride(Args, OverrideStr, SavedStrings);
 451   }
 452
 453   std::string Path = GetExecutablePath(ToolContext.Path, CanonicalPrefixes);
 454
 455   // Whether the cc1 tool should be called inside the current process, or if we
 456   // should spawn a new clang subprocess (old behavior).
 457   // Not having an additional process saves some execution time of Windows,
 458   // and makes debugging and profiling easier.
 459   bool UseNewCC1Process = CLANG_SPAWN_CC1;
 460   for (const char *Arg : Args)
 461     UseNewCC1Process = llvm::StringSwitch<bool>(Arg)
 462                            .Case("-fno-integrated-cc1", true)
 463                            .Case("-fintegrated-cc1", false)
 464                            .Default(UseNewCC1Process);
 465
 466   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts =
 467       CreateAndPopulateDiagOpts(Args);
 468
 469   TextDiagnosticPrinter *DiagClient
 470     = new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
 471   FixupDiagPrefixExeName(DiagClient, ProgName);
 472
 473   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
 474
 475   DiagnosticsEngine Diags(DiagID, &*DiagOpts, DiagClient);
 476
 477   if (!DiagOpts->DiagnosticSerializationFile.empty()) {
 478     auto SerializedConsumer =
 479         clang::serialized_diags::create(DiagOpts->DiagnosticSerializationFile,
 480                                         &*DiagOpts, /*MergeChildRecords=*/true);
 481     Diags.setClient(new ChainedDiagnosticConsumer(
 482         Diags.takeClient(), std::move(SerializedConsumer)));
 483   }
 484
 485   ProcessWarningOptions(Diags, *DiagOpts, /*ReportDiags=*/false);
 486
 487   Driver TheDriver(Path, llvm::sys::getDefaultTargetTriple(), Diags);
 488   SetInstallDir(Args, TheDriver, CanonicalPrefixes);
 489   auto TargetAndMode = ToolChain::getTargetAndModeFromProgramName(ProgName);
 490   TheDriver.setTargetAndMode(TargetAndMode);
 491   // If -canonical-prefixes is set, GetExecutablePath will have resolved Path
 492   // to the llvm driver binary, not clang. In this case, we need to use
 493   // PrependArg which should be clang-*. Checking just CanonicalPrefixes is
 494   // safe even in the normal case because PrependArg will be null so
 495   // setPrependArg will be a no-op.
 496   if (ToolContext.NeedsPrependArg || CanonicalPrefixes)
 497     TheDriver.setPrependArg(ToolContext.PrependArg);
 498
 499   insertTargetAndModeArgs(TargetAndMode, Args, SavedStrings);
 500
 501   if (!SetBackdoorDriverOutputsFromEnvVars(TheDriver))
 502     return 1;
 503
 504   if (!UseNewCC1Process) {
 505     TheDriver.CC1Main = [ToolContext](SmallVectorImpl<const char *> &ArgV) {
 506       return ExecuteCC1Tool(ArgV, ToolContext);
 507     };
 508     // Ensure the CC1Command actually catches cc1 crashes
 509     llvm::CrashRecoveryContext::Enable();
 510   }
 511
 512   std::unique_ptr<Compilation> C(TheDriver.BuildCompilation(Args));
 513
 514   Driver::ReproLevel ReproLevel = Driver::ReproLevel::OnCrash;
 515   if (Arg *A = C->getArgs().getLastArg(options::OPT_gen_reproducer_eq)) {
 516     auto Level =
 517         llvm::StringSwitch<std::optional<Driver::ReproLevel>>(A->getValue())
 518             .Case("off", Driver::ReproLevel::Off)
 519             .Case("crash", Driver::ReproLevel::OnCrash)
 520             .Case("error", Driver::ReproLevel::OnError)
 521             .Case("always", Driver::ReproLevel::Always)
 522             .Default(std::nullopt);
 523     if (!Level) {
 524       llvm::errs() << "Unknown value for " << A->getSpelling() << ": '"
 525                    << A->getValue() << "'\n";
 526       return 1;
 527     }
 528     ReproLevel = *Level;
 529   }
 530   if (!!::getenv("FORCE_CLANG_DIAGNOSTICS_CRASH"))
 531     ReproLevel = Driver::ReproLevel::Always;
 532
 533   int Res = 1;
 534   bool IsCrash = false;
 535   Driver::CommandStatus CommandStatus = Driver::CommandStatus::Ok;
 536   // Pretend the first command failed if ReproStatus is Always.
 537   const Command *FailingCommand = nullptr;
 538   if (!C->getJobs().empty())
 539     FailingCommand = &*C->getJobs().begin();
 540   if (C && !C->containsError()) {
 541     SmallVector<std::pair<int, const Command *>, 4> FailingCommands;
 542     Res = TheDriver.ExecuteCompilation(*C, FailingCommands);
 543
 544     for (const auto &P : FailingCommands) {
 545       int CommandRes = P.first;
 546       FailingCommand = P.second;
 547       if (!Res)
 548         Res = CommandRes;
 549
 550       // If result status is < 0, then the driver command signalled an error.
 551       // If result status is 70, then the driver command reported a fatal error.
 552       // On Windows, abort will return an exit code of 3.  In these cases,
 553       // generate additional diagnostic information if possible.
 554       IsCrash = CommandRes < 0 || CommandRes == 70;
 555 #ifdef _WIN32
 556       IsCrash |= CommandRes == 3;
 557 #endif
 558 #if LLVM_ON_UNIX
 559       // When running in integrated-cc1 mode, the CrashRecoveryContext returns
 560       // the same codes as if the program crashed. See section "Exit Status for
 561       // Commands":
 562       // https://pubs.opengroup.org/onlinepubs/9699919799/xrat/V4_xcu_chap02.html
 563       IsCrash |= CommandRes > 128;
 564 #endif
 565       CommandStatus =
 566           IsCrash ? Driver::CommandStatus::Crash : Driver::CommandStatus::Error;
 567       if (IsCrash)
 568         break;
 569     }
 570   }
 571
 572   // Print the bug report message that would be printed if we did actually
 573   // crash, but only if we're crashing due to FORCE_CLANG_DIAGNOSTICS_CRASH.
 574   if (::getenv("FORCE_CLANG_DIAGNOSTICS_CRASH"))
 575     llvm::dbgs() << llvm::getBugReportMsg();
 576   if (FailingCommand != nullptr &&
 577     TheDriver.maybeGenerateCompilationDiagnostics(CommandStatus, ReproLevel,
 578                                                   *C, *FailingCommand))
 579     Res = 1;
 580
 581   Diags.getClient()->finish();
 582
 583   if (!UseNewCC1Process && IsCrash) {
 584     // When crashing in -fintegrated-cc1 mode, bury the timer pointers, because
 585     // the internal linked list might point to already released stack frames.
 586     llvm::BuryPointer(llvm::TimerGroup::aquireDefaultGroup());
 587   } else {
 588     // If any timers were active but haven't been destroyed yet, print their
 589     // results now.  This happens in -disable-free mode.
 590     llvm::TimerGroup::printAll(llvm::errs());
 591     llvm::TimerGroup::clearAll();
 592   }
 593
 594 #ifdef _WIN32
 595   // Exit status should not be negative on Win32, unless abnormal termination.
 596   // Once abnormal termination was caught, negative status should not be
 597   // propagated.
 598   if (Res < 0)
 599     Res = 1;
 600 #endif
 601
 602   // If we have multiple failing commands, we return the result of the first
 603   // failing command.
 604   return Res;
 605 }