xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision 99337e246cc258e89dc68f0b0e654be89d010cf7)
1 //===- CompilerInvocation.cpp ---------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/Frontend/CompilerInvocation.h"
11 #include "TestModuleFileExtension.h"
12 #include "clang/Basic/Builtins.h"
13 #include "clang/Basic/CharInfo.h"
14 #include "clang/Basic/CommentOptions.h"
15 #include "clang/Basic/DebugInfoOptions.h"
16 #include "clang/Basic/Diagnostic.h"
17 #include "clang/Basic/DiagnosticOptions.h"
18 #include "clang/Basic/FileSystemOptions.h"
19 #include "clang/Basic/LLVM.h"
20 #include "clang/Basic/LangOptions.h"
21 #include "clang/Basic/ObjCRuntime.h"
22 #include "clang/Basic/Sanitizers.h"
23 #include "clang/Basic/SourceLocation.h"
24 #include "clang/Basic/TargetOptions.h"
25 #include "clang/Basic/Version.h"
26 #include "clang/Basic/VirtualFileSystem.h"
27 #include "clang/Basic/Visibility.h"
28 #include "clang/Basic/XRayInstr.h"
29 #include "clang/Config/config.h"
30 #include "clang/Driver/DriverDiagnostic.h"
31 #include "clang/Driver/Options.h"
32 #include "clang/Frontend/CodeGenOptions.h"
33 #include "clang/Frontend/CommandLineSourceLoc.h"
34 #include "clang/Frontend/DependencyOutputOptions.h"
35 #include "clang/Frontend/FrontendDiagnostic.h"
36 #include "clang/Frontend/FrontendOptions.h"
37 #include "clang/Frontend/LangStandard.h"
38 #include "clang/Frontend/MigratorOptions.h"
39 #include "clang/Frontend/PreprocessorOutputOptions.h"
40 #include "clang/Frontend/Utils.h"
41 #include "clang/Lex/HeaderSearchOptions.h"
42 #include "clang/Lex/PreprocessorOptions.h"
43 #include "clang/Sema/CodeCompleteOptions.h"
44 #include "clang/Serialization/ModuleFileExtension.h"
45 #include "clang/StaticAnalyzer/Core/AnalyzerOptions.h"
46 #include "llvm/ADT/APInt.h"
47 #include "llvm/ADT/ArrayRef.h"
48 #include "llvm/ADT/CachedHashString.h"
49 #include "llvm/ADT/Hashing.h"
50 #include "llvm/ADT/None.h"
51 #include "llvm/ADT/Optional.h"
52 #include "llvm/ADT/SmallString.h"
53 #include "llvm/ADT/SmallVector.h"
54 #include "llvm/ADT/StringRef.h"
55 #include "llvm/ADT/StringSwitch.h"
56 #include "llvm/ADT/Triple.h"
57 #include "llvm/ADT/Twine.h"
58 #include "llvm/Linker/Linker.h"
59 #include "llvm/MC/MCTargetOptions.h"
60 #include "llvm/Option/Arg.h"
61 #include "llvm/Option/ArgList.h"
62 #include "llvm/Option/OptSpecifier.h"
63 #include "llvm/Option/OptTable.h"
64 #include "llvm/Option/Option.h"
65 #include "llvm/ProfileData/InstrProfReader.h"
66 #include "llvm/Support/CodeGen.h"
67 #include "llvm/Support/Compiler.h"
68 #include "llvm/Support/Error.h"
69 #include "llvm/Support/ErrorHandling.h"
70 #include "llvm/Support/ErrorOr.h"
71 #include "llvm/Support/FileSystem.h"
72 #include "llvm/Support/Host.h"
73 #include "llvm/Support/MathExtras.h"
74 #include "llvm/Support/MemoryBuffer.h"
75 #include "llvm/Support/Path.h"
76 #include "llvm/Support/Process.h"
77 #include "llvm/Support/Regex.h"
78 #include "llvm/Support/VersionTuple.h"
79 #include "llvm/Support/raw_ostream.h"
80 #include "llvm/Target/TargetOptions.h"
81 #include <algorithm>
82 #include <atomic>
83 #include <cassert>
84 #include <cstddef>
85 #include <cstring>
86 #include <memory>
87 #include <string>
88 #include <tuple>
89 #include <utility>
90 #include <vector>
91 
92 using namespace clang;
93 using namespace driver;
94 using namespace options;
95 using namespace llvm::opt;
96 
97 //===----------------------------------------------------------------------===//
98 // Initialization.
99 //===----------------------------------------------------------------------===//
100 
101 CompilerInvocationBase::CompilerInvocationBase()
102     : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
103       DiagnosticOpts(new DiagnosticOptions()),
104       HeaderSearchOpts(new HeaderSearchOptions()),
105       PreprocessorOpts(new PreprocessorOptions()) {}
106 
107 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
108     : LangOpts(new LangOptions(*X.getLangOpts())),
109       TargetOpts(new TargetOptions(X.getTargetOpts())),
110       DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
111       HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
112       PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
113 
114 CompilerInvocationBase::~CompilerInvocationBase() = default;
115 
116 //===----------------------------------------------------------------------===//
117 // Deserialization (from args)
118 //===----------------------------------------------------------------------===//
119 
120 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
121                                      DiagnosticsEngine &Diags) {
122   unsigned DefaultOpt = 0;
123   if (IK.getLanguage() == InputKind::OpenCL && !Args.hasArg(OPT_cl_opt_disable))
124     DefaultOpt = 2;
125 
126   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
127     if (A->getOption().matches(options::OPT_O0))
128       return 0;
129 
130     if (A->getOption().matches(options::OPT_Ofast))
131       return 3;
132 
133     assert(A->getOption().matches(options::OPT_O));
134 
135     StringRef S(A->getValue());
136     if (S == "s" || S == "z" || S.empty())
137       return 2;
138 
139     if (S == "g")
140       return 1;
141 
142     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
143   }
144 
145   return DefaultOpt;
146 }
147 
148 static unsigned getOptimizationLevelSize(ArgList &Args) {
149   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
150     if (A->getOption().matches(options::OPT_O)) {
151       switch (A->getValue()[0]) {
152       default:
153         return 0;
154       case 's':
155         return 1;
156       case 'z':
157         return 2;
158       }
159     }
160   }
161   return 0;
162 }
163 
164 static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
165                               OptSpecifier GroupWithValue,
166                               std::vector<std::string> &Diagnostics) {
167   for (auto *A : Args.filtered(Group)) {
168     if (A->getOption().getKind() == Option::FlagClass) {
169       // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
170       // its name (minus the "W" or "R" at the beginning) to the warning list.
171       Diagnostics.push_back(A->getOption().getName().drop_front(1));
172     } else if (A->getOption().matches(GroupWithValue)) {
173       // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
174       Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
175     } else {
176       // Otherwise, add its value (for OPT_W_Joined and similar).
177       for (const auto *Arg : A->getValues())
178         Diagnostics.emplace_back(Arg);
179     }
180   }
181 }
182 
183 static void getAllNoBuiltinFuncValues(ArgList &Args,
184                                       std::vector<std::string> &Funcs) {
185   SmallVector<const char *, 8> Values;
186   for (const auto &Arg : Args) {
187     const Option &O = Arg->getOption();
188     if (O.matches(options::OPT_fno_builtin_)) {
189       const char *FuncName = Arg->getValue();
190       if (Builtin::Context::isBuiltinFunc(FuncName))
191         Values.push_back(FuncName);
192     }
193   }
194   Funcs.insert(Funcs.end(), Values.begin(), Values.end());
195 }
196 
197 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
198                               DiagnosticsEngine &Diags) {
199   bool Success = true;
200   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
201     StringRef Name = A->getValue();
202     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
203 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
204       .Case(CMDFLAG, NAME##Model)
205 #include "clang/StaticAnalyzer/Core/Analyses.def"
206       .Default(NumStores);
207     if (Value == NumStores) {
208       Diags.Report(diag::err_drv_invalid_value)
209         << A->getAsString(Args) << Name;
210       Success = false;
211     } else {
212       Opts.AnalysisStoreOpt = Value;
213     }
214   }
215 
216   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
217     StringRef Name = A->getValue();
218     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
219 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
220       .Case(CMDFLAG, NAME##Model)
221 #include "clang/StaticAnalyzer/Core/Analyses.def"
222       .Default(NumConstraints);
223     if (Value == NumConstraints) {
224       Diags.Report(diag::err_drv_invalid_value)
225         << A->getAsString(Args) << Name;
226       Success = false;
227     } else {
228       Opts.AnalysisConstraintsOpt = Value;
229     }
230   }
231 
232   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
233     StringRef Name = A->getValue();
234     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
235 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
236       .Case(CMDFLAG, PD_##NAME)
237 #include "clang/StaticAnalyzer/Core/Analyses.def"
238       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
239     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
240       Diags.Report(diag::err_drv_invalid_value)
241         << A->getAsString(Args) << Name;
242       Success = false;
243     } else {
244       Opts.AnalysisDiagOpt = Value;
245     }
246   }
247 
248   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
249     StringRef Name = A->getValue();
250     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
251 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
252       .Case(CMDFLAG, NAME)
253 #include "clang/StaticAnalyzer/Core/Analyses.def"
254       .Default(NumPurgeModes);
255     if (Value == NumPurgeModes) {
256       Diags.Report(diag::err_drv_invalid_value)
257         << A->getAsString(Args) << Name;
258       Success = false;
259     } else {
260       Opts.AnalysisPurgeOpt = Value;
261     }
262   }
263 
264   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
265     StringRef Name = A->getValue();
266     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
267 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
268       .Case(CMDFLAG, NAME)
269 #include "clang/StaticAnalyzer/Core/Analyses.def"
270       .Default(NumInliningModes);
271     if (Value == NumInliningModes) {
272       Diags.Report(diag::err_drv_invalid_value)
273         << A->getAsString(Args) << Name;
274       Success = false;
275     } else {
276       Opts.InliningMode = Value;
277     }
278   }
279 
280   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
281   Opts.ShowEnabledCheckerList = Args.hasArg(OPT_analyzer_list_enabled_checkers);
282   Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
283 
284   Opts.visualizeExplodedGraphWithGraphViz =
285     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
286   Opts.visualizeExplodedGraphWithUbiGraph =
287     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
288   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
289   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
290   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
291   Opts.AnalyzeNestedBlocks =
292     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
293   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
294   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
295   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
296   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
297   Opts.maxBlockVisitOnPath =
298       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
299   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
300   Opts.InlineMaxStackDepth =
301       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
302                          Opts.InlineMaxStackDepth, Diags);
303 
304   Opts.CheckersControlList.clear();
305   for (const Arg *A :
306        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
307     A->claim();
308     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
309     // We can have a list of comma separated checker names, e.g:
310     // '-analyzer-checker=cocoa,unix'
311     StringRef checkerList = A->getValue();
312     SmallVector<StringRef, 4> checkers;
313     checkerList.split(checkers, ",");
314     for (auto checker : checkers)
315       Opts.CheckersControlList.emplace_back(checker, enable);
316   }
317 
318   // Go through the analyzer configuration options.
319   for (const auto *A : Args.filtered(OPT_analyzer_config)) {
320     A->claim();
321     // We can have a list of comma separated config names, e.g:
322     // '-analyzer-config key1=val1,key2=val2'
323     StringRef configList = A->getValue();
324     SmallVector<StringRef, 4> configVals;
325     configList.split(configVals, ",");
326     for (const auto &configVal : configVals) {
327       StringRef key, val;
328       std::tie(key, val) = configVal.split("=");
329       if (val.empty()) {
330         Diags.Report(SourceLocation(),
331                      diag::err_analyzer_config_no_value) << configVal;
332         Success = false;
333         break;
334       }
335       if (val.find('=') != StringRef::npos) {
336         Diags.Report(SourceLocation(),
337                      diag::err_analyzer_config_multiple_values)
338           << configVal;
339         Success = false;
340         break;
341       }
342       Opts.Config[key] = val;
343     }
344   }
345 
346   llvm::raw_string_ostream os(Opts.FullCompilerInvocation);
347   for (unsigned i = 0; i < Args.getNumInputArgStrings(); ++i) {
348     if (i != 0)
349       os << " ";
350     os << Args.getArgString(i);
351   }
352   os.flush();
353 
354   return Success;
355 }
356 
357 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
358   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
359   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
360   return true;
361 }
362 
363 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
364   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
365   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
366 }
367 
368 static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
369   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
370     StringRef Value = A->getValue();
371     if (Value == "small" || Value == "kernel" || Value == "medium" ||
372         Value == "large")
373       return Value;
374     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
375   }
376   return "default";
377 }
378 
379 static llvm::Reloc::Model getRelocModel(ArgList &Args,
380                                         DiagnosticsEngine &Diags) {
381   if (Arg *A = Args.getLastArg(OPT_mrelocation_model)) {
382     StringRef Value = A->getValue();
383     auto RM = llvm::StringSwitch<llvm::Optional<llvm::Reloc::Model>>(Value)
384                   .Case("static", llvm::Reloc::Static)
385                   .Case("pic", llvm::Reloc::PIC_)
386                   .Case("ropi", llvm::Reloc::ROPI)
387                   .Case("rwpi", llvm::Reloc::RWPI)
388                   .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
389                   .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
390                   .Default(None);
391     if (RM.hasValue())
392       return *RM;
393     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
394   }
395   return llvm::Reloc::PIC_;
396 }
397 
398 /// Create a new Regex instance out of the string value in \p RpassArg.
399 /// It returns a pointer to the newly generated Regex instance.
400 static std::shared_ptr<llvm::Regex>
401 GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
402                                 Arg *RpassArg) {
403   StringRef Val = RpassArg->getValue();
404   std::string RegexError;
405   std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
406   if (!Pattern->isValid(RegexError)) {
407     Diags.Report(diag::err_drv_optimization_remark_pattern)
408         << RegexError << RpassArg->getAsString(Args);
409     Pattern.reset();
410   }
411   return Pattern;
412 }
413 
414 static bool parseDiagnosticLevelMask(StringRef FlagName,
415                                      const std::vector<std::string> &Levels,
416                                      DiagnosticsEngine *Diags,
417                                      DiagnosticLevelMask &M) {
418   bool Success = true;
419   for (const auto &Level : Levels) {
420     DiagnosticLevelMask const PM =
421       llvm::StringSwitch<DiagnosticLevelMask>(Level)
422         .Case("note",    DiagnosticLevelMask::Note)
423         .Case("remark",  DiagnosticLevelMask::Remark)
424         .Case("warning", DiagnosticLevelMask::Warning)
425         .Case("error",   DiagnosticLevelMask::Error)
426         .Default(DiagnosticLevelMask::None);
427     if (PM == DiagnosticLevelMask::None) {
428       Success = false;
429       if (Diags)
430         Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
431     }
432     M = M | PM;
433   }
434   return Success;
435 }
436 
437 static void parseSanitizerKinds(StringRef FlagName,
438                                 const std::vector<std::string> &Sanitizers,
439                                 DiagnosticsEngine &Diags, SanitizerSet &S) {
440   for (const auto &Sanitizer : Sanitizers) {
441     SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
442     if (K == 0)
443       Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
444     else
445       S.set(K, true);
446   }
447 }
448 
449 static void parseXRayInstrumentationBundle(StringRef FlagName, StringRef Bundle,
450                                            ArgList &Args, DiagnosticsEngine &D,
451                                            XRayInstrSet &S) {
452   llvm::SmallVector<StringRef, 2> BundleParts;
453   llvm::SplitString(Bundle, BundleParts, ",");
454   for (const auto B : BundleParts) {
455     auto Mask = parseXRayInstrValue(B);
456     if (Mask == XRayInstrKind::None)
457       if (B != "none")
458         D.Report(diag::err_drv_invalid_value) << FlagName << Bundle;
459       else
460         S.Mask = Mask;
461     else if (Mask == XRayInstrKind::All)
462       S.Mask = Mask;
463     else
464       S.set(Mask, true);
465   }
466 }
467 
468 // Set the profile kind for fprofile-instrument.
469 static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
470                                DiagnosticsEngine &Diags) {
471   Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
472   if (A == nullptr)
473     return;
474   StringRef S = A->getValue();
475   unsigned I = llvm::StringSwitch<unsigned>(S)
476                    .Case("none", CodeGenOptions::ProfileNone)
477                    .Case("clang", CodeGenOptions::ProfileClangInstr)
478                    .Case("llvm", CodeGenOptions::ProfileIRInstr)
479                    .Default(~0U);
480   if (I == ~0U) {
481     Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
482                                                          << S;
483     return;
484   }
485   auto Instrumentor = static_cast<CodeGenOptions::ProfileInstrKind>(I);
486   Opts.setProfileInstr(Instrumentor);
487 }
488 
489 // Set the profile kind using fprofile-instrument-use-path.
490 static void setPGOUseInstrumentor(CodeGenOptions &Opts,
491                                   const Twine &ProfileName) {
492   auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
493   // In error, return silently and let Clang PGOUse report the error message.
494   if (auto E = ReaderOrErr.takeError()) {
495     llvm::consumeError(std::move(E));
496     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
497     return;
498   }
499   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
500     std::move(ReaderOrErr.get());
501   if (PGOReader->isIRLevelProfile())
502     Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
503   else
504     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
505 }
506 
507 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
508                              DiagnosticsEngine &Diags,
509                              const TargetOptions &TargetOpts,
510                              const FrontendOptions &FrontendOpts) {
511   bool Success = true;
512   llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
513 
514   unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
515   // TODO: This could be done in Driver
516   unsigned MaxOptLevel = 3;
517   if (OptimizationLevel > MaxOptLevel) {
518     // If the optimization level is not supported, fall back on the default
519     // optimization
520     Diags.Report(diag::warn_drv_optimization_value)
521         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
522     OptimizationLevel = MaxOptLevel;
523   }
524   Opts.OptimizationLevel = OptimizationLevel;
525 
526   // At O0 we want to fully disable inlining outside of cases marked with
527   // 'alwaysinline' that are required for correctness.
528   Opts.setInlining((Opts.OptimizationLevel == 0)
529                        ? CodeGenOptions::OnlyAlwaysInlining
530                        : CodeGenOptions::NormalInlining);
531   // Explicit inlining flags can disable some or all inlining even at
532   // optimization levels above zero.
533   if (Arg *InlineArg = Args.getLastArg(
534           options::OPT_finline_functions, options::OPT_finline_hint_functions,
535           options::OPT_fno_inline_functions, options::OPT_fno_inline)) {
536     if (Opts.OptimizationLevel > 0) {
537       const Option &InlineOpt = InlineArg->getOption();
538       if (InlineOpt.matches(options::OPT_finline_functions))
539         Opts.setInlining(CodeGenOptions::NormalInlining);
540       else if (InlineOpt.matches(options::OPT_finline_hint_functions))
541         Opts.setInlining(CodeGenOptions::OnlyHintInlining);
542       else
543         Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
544     }
545   }
546 
547   Opts.ExperimentalNewPassManager = Args.hasFlag(
548       OPT_fexperimental_new_pass_manager, OPT_fno_experimental_new_pass_manager,
549       /* Default */ ENABLE_EXPERIMENTAL_NEW_PASS_MANAGER);
550 
551   Opts.DebugPassManager =
552       Args.hasFlag(OPT_fdebug_pass_manager, OPT_fno_debug_pass_manager,
553                    /* Default */ false);
554 
555   if (Arg *A = Args.getLastArg(OPT_fveclib)) {
556     StringRef Name = A->getValue();
557     if (Name == "Accelerate")
558       Opts.setVecLib(CodeGenOptions::Accelerate);
559     else if (Name == "SVML")
560       Opts.setVecLib(CodeGenOptions::SVML);
561     else if (Name == "none")
562       Opts.setVecLib(CodeGenOptions::NoLibrary);
563     else
564       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
565   }
566 
567   if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
568     unsigned Val =
569         llvm::StringSwitch<unsigned>(A->getValue())
570             .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
571             .Case("limited", codegenoptions::LimitedDebugInfo)
572             .Case("standalone", codegenoptions::FullDebugInfo)
573             .Default(~0U);
574     if (Val == ~0U)
575       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
576                                                 << A->getValue();
577     else
578       Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
579   }
580   if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
581     unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
582                        .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
583                        .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
584                        .Case("sce", unsigned(llvm::DebuggerKind::SCE))
585                        .Default(~0U);
586     if (Val == ~0U)
587       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
588                                                 << A->getValue();
589     else
590       Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
591   }
592   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
593   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
594   Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
595   Opts.MacroDebugInfo = Args.hasArg(OPT_debug_info_macro);
596   Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
597   Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
598   Opts.EnableSplitDwarf = Args.hasArg(OPT_enable_split_dwarf);
599   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
600   Opts.SplitDwarfInlining = !Args.hasArg(OPT_fno_split_dwarf_inlining);
601   Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
602   Opts.DebugExplicitImport = Args.hasArg(OPT_dwarf_explicit_import);
603   Opts.DebugFwdTemplateParams = Args.hasArg(OPT_debug_forward_template_params);
604   Opts.EmbedSource = Args.hasArg(OPT_gembed_source);
605 
606   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
607     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
608 
609   if (const Arg *A =
610           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
611     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
612 
613   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
614   Opts.DisableLifetimeMarkers = Args.hasArg(OPT_disable_lifetimemarkers);
615   Opts.DisableO0ImplyOptNone = Args.hasArg(OPT_disable_O0_optnone);
616   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
617   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
618   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
619     OPT_fuse_register_sized_bitfield_access);
620   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
621   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
622   Opts.NewStructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa) &&
623                            Args.hasArg(OPT_new_struct_path_tbaa);
624   Opts.FineGrainedBitfieldAccesses =
625       Args.hasFlag(OPT_ffine_grained_bitfield_accesses,
626                    OPT_fno_fine_grained_bitfield_accesses, false);
627   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
628   Opts.MergeAllConstants = Args.hasArg(OPT_fmerge_all_constants);
629   Opts.NoCommon = Args.hasArg(OPT_fno_common);
630   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
631   Opts.OptimizeSize = getOptimizationLevelSize(Args);
632   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
633                             Args.hasArg(OPT_ffreestanding));
634   if (Opts.SimplifyLibCalls)
635     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
636   Opts.UnrollLoops =
637       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
638                    (Opts.OptimizationLevel > 1));
639   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
640 
641   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
642   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
643   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
644   Opts.DebugInfoForProfiling = Args.hasFlag(
645       OPT_fdebug_info_for_profiling, OPT_fno_debug_info_for_profiling, false);
646   Opts.GnuPubnames = Args.hasArg(OPT_ggnu_pubnames);
647 
648   setPGOInstrumentor(Opts, Args, Diags);
649   Opts.InstrProfileOutput =
650       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
651   Opts.ProfileInstrumentUsePath =
652       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
653   if (!Opts.ProfileInstrumentUsePath.empty())
654     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
655 
656   Opts.CoverageMapping =
657       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
658   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
659   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
660   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
661   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
662   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
663   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
664   Opts.RegisterGlobalDtorsWithAtExit =
665       Args.hasArg(OPT_fregister_global_dtors_with_atexit);
666   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
667   Opts.CodeModel = getCodeModel(Args, Diags);
668   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
669   Opts.DisableFPElim =
670       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
671   Opts.DisableFree = Args.hasArg(OPT_disable_free);
672   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
673   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
674   Opts.NoEscapingBlockTailCalls =
675       Args.hasArg(OPT_fno_escaping_block_tail_calls);
676   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
677   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable) ||
678                           Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
679                           Args.hasArg(OPT_cl_fast_relaxed_math);
680   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
681   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
682                        Args.hasArg(OPT_cl_finite_math_only) ||
683                        Args.hasArg(OPT_cl_fast_relaxed_math));
684   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
685                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
686                        Args.hasArg(OPT_cl_finite_math_only) ||
687                        Args.hasArg(OPT_cl_fast_relaxed_math));
688   Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
689                         Args.hasArg(OPT_cl_no_signed_zeros) ||
690                         Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
691                         Args.hasArg(OPT_cl_fast_relaxed_math));
692   Opts.Reassociate = Args.hasArg(OPT_mreassociate);
693   Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero);
694   Opts.CorrectlyRoundedDivSqrt =
695       Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
696   Opts.UniformWGSize =
697       Args.hasArg(OPT_cl_uniform_work_group_size);
698   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
699   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
700   Opts.NoTrappingMath = Args.hasArg(OPT_fno_trapping_math);
701   Opts.StrictFloatCastOverflow =
702       !Args.hasArg(OPT_fno_strict_float_cast_overflow);
703 
704   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
705   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
706   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
707   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
708   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
709   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
710   Opts.IncrementalLinkerCompatible =
711       Args.hasArg(OPT_mincremental_linker_compatible);
712   Opts.PIECopyRelocations =
713       Args.hasArg(OPT_mpie_copy_relocations);
714   Opts.NoPLT = Args.hasArg(OPT_fno_plt);
715   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
716   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
717   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
718   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
719   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
720   Opts.StrictReturn = !Args.hasArg(OPT_fno_strict_return);
721   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
722   Opts.ForceEmitVTables = Args.hasArg(OPT_fforce_emit_vtables);
723   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
724                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
725                       Args.hasArg(OPT_cl_fast_relaxed_math);
726   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
727   Opts.RelocationModel = getRelocModel(Args, Diags);
728   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
729   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
730     Diags.Report(diag::err_drv_invalid_value)
731         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
732         << Opts.ThreadModel;
733   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
734   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
735 
736   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
737                                        OPT_fno_function_sections, false);
738   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
739                                    OPT_fno_data_sections, false);
740   Opts.StackSizeSection =
741       Args.hasFlag(OPT_fstack_size_section, OPT_fno_stack_size_section, false);
742   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
743                                          OPT_fno_unique_section_names, true);
744 
745   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
746 
747   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
748 
749   Opts.NullPointerIsValid = Args.hasArg(OPT_fno_delete_null_pointer_checks);
750 
751   Opts.ProfileSampleAccurate = Args.hasArg(OPT_fprofile_sample_accurate);
752 
753   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
754   Opts.PrepareForThinLTO = false;
755   if (Arg *A = Args.getLastArg(OPT_flto_EQ)) {
756     StringRef S = A->getValue();
757     if (S == "thin")
758       Opts.PrepareForThinLTO = true;
759     else if (S != "full")
760       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
761   }
762   Opts.LTOUnit = Args.hasFlag(OPT_flto_unit, OPT_fno_lto_unit, false);
763   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
764     if (IK.getLanguage() != InputKind::LLVM_IR)
765       Diags.Report(diag::err_drv_argument_only_allowed_with)
766           << A->getAsString(Args) << "-x ir";
767     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
768   }
769   if (Arg *A = Args.getLastArg(OPT_save_temps_EQ))
770     Opts.SaveTempsFilePrefix =
771         llvm::StringSwitch<std::string>(A->getValue())
772             .Case("obj", FrontendOpts.OutputFile)
773             .Default(llvm::sys::path::filename(FrontendOpts.OutputFile).str());
774 
775   Opts.ThinLinkBitcodeFile = Args.getLastArgValue(OPT_fthin_link_bitcode_EQ);
776 
777   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
778 
779   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
780   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
781 
782   Opts.PreferVectorWidth = Args.getLastArgValue(OPT_mprefer_vector_width_EQ);
783 
784   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
785   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
786 
787   Opts.ControlFlowGuard = Args.hasArg(OPT_cfguard);
788 
789   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
790   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
791   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
792   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
793     Opts.CoverageDataFile = Args.getLastArgValue(OPT_coverage_data_file);
794     Opts.CoverageNotesFile = Args.getLastArgValue(OPT_coverage_notes_file);
795     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
796     Opts.CoverageNoFunctionNamesInData =
797         Args.hasArg(OPT_coverage_no_function_names_in_data);
798     Opts.CoverageExitBlockBeforeBody =
799         Args.hasArg(OPT_coverage_exit_block_before_body);
800     if (Args.hasArg(OPT_coverage_version_EQ)) {
801       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
802       if (CoverageVersion.size() != 4) {
803         Diags.Report(diag::err_drv_invalid_value)
804             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
805             << CoverageVersion;
806       } else {
807         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
808       }
809     }
810   }
811   // Handle -fembed-bitcode option.
812   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
813     StringRef Name = A->getValue();
814     unsigned Model = llvm::StringSwitch<unsigned>(Name)
815         .Case("off", CodeGenOptions::Embed_Off)
816         .Case("all", CodeGenOptions::Embed_All)
817         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
818         .Case("marker", CodeGenOptions::Embed_Marker)
819         .Default(~0U);
820     if (Model == ~0U) {
821       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
822       Success = false;
823     } else
824       Opts.setEmbedBitcode(
825           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
826   }
827   // FIXME: For backend options that are not yet recorded as function
828   // attributes in the IR, keep track of them so we can embed them in a
829   // separate data section and use them when building the bitcode.
830   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
831     for (const auto &A : Args) {
832       // Do not encode output and input.
833       if (A->getOption().getID() == options::OPT_o ||
834           A->getOption().getID() == options::OPT_INPUT ||
835           A->getOption().getID() == options::OPT_x ||
836           A->getOption().getID() == options::OPT_fembed_bitcode ||
837           (A->getOption().getGroup().isValid() &&
838            A->getOption().getGroup().getID() == options::OPT_W_Group))
839         continue;
840       ArgStringList ASL;
841       A->render(Args, ASL);
842       for (const auto &arg : ASL) {
843         StringRef ArgStr(arg);
844         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
845         // using \00 to seperate each commandline options.
846         Opts.CmdArgs.push_back('\0');
847       }
848     }
849   }
850 
851   Opts.PreserveVec3Type = Args.hasArg(OPT_fpreserve_vec3_type);
852   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
853   Opts.InstrumentFunctionsAfterInlining =
854       Args.hasArg(OPT_finstrument_functions_after_inlining);
855   Opts.InstrumentFunctionEntryBare =
856       Args.hasArg(OPT_finstrument_function_entry_bare);
857 
858   Opts.XRayInstrumentFunctions =
859       Args.hasArg(OPT_fxray_instrument);
860   Opts.XRayAlwaysEmitCustomEvents =
861       Args.hasArg(OPT_fxray_always_emit_customevents);
862   Opts.XRayAlwaysEmitTypedEvents =
863       Args.hasArg(OPT_fxray_always_emit_typedevents);
864   Opts.XRayInstructionThreshold =
865       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_EQ, 200, Diags);
866 
867   auto XRayInstrBundles =
868       Args.getAllArgValues(OPT_fxray_instrumentation_bundle);
869   if (XRayInstrBundles.empty())
870     Opts.XRayInstrumentationBundle.Mask = XRayInstrKind::All;
871   else
872     for (const auto &A : XRayInstrBundles)
873       parseXRayInstrumentationBundle("-fxray-instrumentation-bundle=", A, Args,
874                                      Diags, Opts.XRayInstrumentationBundle);
875 
876   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
877   Opts.CallFEntry = Args.hasArg(OPT_mfentry);
878   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
879 
880   if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
881     StringRef Name = A->getValue();
882     if (Name == "full") {
883       Opts.CFProtectionReturn = 1;
884       Opts.CFProtectionBranch = 1;
885     } else if (Name == "return")
886       Opts.CFProtectionReturn = 1;
887     else if (Name == "branch")
888       Opts.CFProtectionBranch = 1;
889     else if (Name != "none") {
890       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
891       Success = false;
892     }
893   }
894 
895   if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
896                                      OPT_compress_debug_sections_EQ)) {
897     if (A->getOption().getID() == OPT_compress_debug_sections) {
898       // TODO: be more clever about the compression type auto-detection
899       Opts.setCompressDebugSections(llvm::DebugCompressionType::GNU);
900     } else {
901       auto DCT = llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
902                      .Case("none", llvm::DebugCompressionType::None)
903                      .Case("zlib", llvm::DebugCompressionType::Z)
904                      .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
905                      .Default(llvm::DebugCompressionType::None);
906       Opts.setCompressDebugSections(DCT);
907     }
908   }
909 
910   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
911   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
912   for (auto *A :
913        Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
914     CodeGenOptions::BitcodeFileToLink F;
915     F.Filename = A->getValue();
916     if (A->getOption().matches(OPT_mlink_cuda_bitcode)) {
917       F.LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded;
918       // When linking CUDA bitcode, propagate function attributes so that
919       // e.g. libdevice gets fast-math attrs if we're building with fast-math.
920       F.PropagateAttrs = true;
921       F.Internalize = true;
922     }
923     Opts.LinkBitcodeFiles.push_back(F);
924   }
925   Opts.SanitizeCoverageType =
926       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
927   Opts.SanitizeCoverageIndirectCalls =
928       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
929   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
930   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
931   Opts.SanitizeCoverageTraceDiv = Args.hasArg(OPT_fsanitize_coverage_trace_div);
932   Opts.SanitizeCoverageTraceGep = Args.hasArg(OPT_fsanitize_coverage_trace_gep);
933   Opts.SanitizeCoverage8bitCounters =
934       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
935   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
936   Opts.SanitizeCoverageTracePCGuard =
937       Args.hasArg(OPT_fsanitize_coverage_trace_pc_guard);
938   Opts.SanitizeCoverageNoPrune = Args.hasArg(OPT_fsanitize_coverage_no_prune);
939   Opts.SanitizeCoverageInline8bitCounters =
940       Args.hasArg(OPT_fsanitize_coverage_inline_8bit_counters);
941   Opts.SanitizeCoveragePCTable = Args.hasArg(OPT_fsanitize_coverage_pc_table);
942   Opts.SanitizeCoverageStackDepth =
943       Args.hasArg(OPT_fsanitize_coverage_stack_depth);
944   Opts.SanitizeMemoryTrackOrigins =
945       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
946   Opts.SanitizeMemoryUseAfterDtor =
947       Args.hasFlag(OPT_fsanitize_memory_use_after_dtor,
948                    OPT_fno_sanitize_memory_use_after_dtor,
949                    false);
950   Opts.SanitizeMinimalRuntime = Args.hasArg(OPT_fsanitize_minimal_runtime);
951   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
952   Opts.SanitizeCfiICallGeneralizePointers =
953       Args.hasArg(OPT_fsanitize_cfi_icall_generalize_pointers);
954   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
955   if (Arg *A = Args.getLastArg(
956           OPT_fsanitize_address_poison_class_member_array_new_cookie,
957           OPT_fno_sanitize_address_poison_class_member_array_new_cookie)) {
958     Opts.SanitizeAddressPoisonClassMemberArrayNewCookie =
959         A->getOption().getID() ==
960         OPT_fsanitize_address_poison_class_member_array_new_cookie;
961   }
962   if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_after_scope,
963                                OPT_fno_sanitize_address_use_after_scope)) {
964     Opts.SanitizeAddressUseAfterScope =
965         A->getOption().getID() == OPT_fsanitize_address_use_after_scope;
966   }
967   Opts.SanitizeAddressGlobalsDeadStripping =
968       Args.hasArg(OPT_fsanitize_address_globals_dead_stripping);
969   Opts.SSPBufferSize =
970       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
971   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
972   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
973     StringRef Val = A->getValue();
974     unsigned StackAlignment = Opts.StackAlignment;
975     Val.getAsInteger(10, StackAlignment);
976     Opts.StackAlignment = StackAlignment;
977   }
978 
979   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
980     StringRef Val = A->getValue();
981     unsigned StackProbeSize = Opts.StackProbeSize;
982     Val.getAsInteger(0, StackProbeSize);
983     Opts.StackProbeSize = StackProbeSize;
984   }
985 
986   Opts.NoStackArgProbe = Args.hasArg(OPT_mno_stack_arg_probe);
987 
988   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
989     StringRef Name = A->getValue();
990     unsigned Method = llvm::StringSwitch<unsigned>(Name)
991       .Case("legacy", CodeGenOptions::Legacy)
992       .Case("non-legacy", CodeGenOptions::NonLegacy)
993       .Case("mixed", CodeGenOptions::Mixed)
994       .Default(~0U);
995     if (Method == ~0U) {
996       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
997       Success = false;
998     } else {
999       Opts.setObjCDispatchMethod(
1000         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
1001     }
1002   }
1003 
1004   if (Args.getLastArg(OPT_femulated_tls) ||
1005       Args.getLastArg(OPT_fno_emulated_tls)) {
1006     Opts.ExplicitEmulatedTLS = true;
1007     Opts.EmulatedTLS =
1008         Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
1009   }
1010 
1011   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
1012     StringRef Name = A->getValue();
1013     unsigned Model = llvm::StringSwitch<unsigned>(Name)
1014         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
1015         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
1016         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
1017         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
1018         .Default(~0U);
1019     if (Model == ~0U) {
1020       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1021       Success = false;
1022     } else {
1023       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
1024     }
1025   }
1026 
1027   if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
1028     StringRef Val = A->getValue();
1029     if (Val == "ieee")
1030       Opts.FPDenormalMode = "ieee";
1031     else if (Val == "preserve-sign")
1032       Opts.FPDenormalMode = "preserve-sign";
1033     else if (Val == "positive-zero")
1034       Opts.FPDenormalMode = "positive-zero";
1035     else
1036       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
1037   }
1038 
1039   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
1040     if (A->getOption().matches(OPT_fpcc_struct_return)) {
1041       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
1042     } else {
1043       assert(A->getOption().matches(OPT_freg_struct_return));
1044       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
1045     }
1046   }
1047 
1048   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
1049   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
1050   bool NeedLocTracking = false;
1051 
1052   Opts.OptRecordFile = Args.getLastArgValue(OPT_opt_record_file);
1053   if (!Opts.OptRecordFile.empty())
1054     NeedLocTracking = true;
1055 
1056   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
1057     Opts.OptimizationRemarkPattern =
1058         GenerateOptimizationRemarkRegex(Diags, Args, A);
1059     NeedLocTracking = true;
1060   }
1061 
1062   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
1063     Opts.OptimizationRemarkMissedPattern =
1064         GenerateOptimizationRemarkRegex(Diags, Args, A);
1065     NeedLocTracking = true;
1066   }
1067 
1068   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
1069     Opts.OptimizationRemarkAnalysisPattern =
1070         GenerateOptimizationRemarkRegex(Diags, Args, A);
1071     NeedLocTracking = true;
1072   }
1073 
1074   Opts.DiagnosticsWithHotness =
1075       Args.hasArg(options::OPT_fdiagnostics_show_hotness);
1076   bool UsingSampleProfile = !Opts.SampleProfileFile.empty();
1077   bool UsingProfile = UsingSampleProfile ||
1078       (Opts.getProfileUse() != CodeGenOptions::ProfileNone);
1079 
1080   if (Opts.DiagnosticsWithHotness && !UsingProfile &&
1081       // An IR file will contain PGO as metadata
1082       IK.getLanguage() != InputKind::LLVM_IR)
1083     Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
1084         << "-fdiagnostics-show-hotness";
1085 
1086   Opts.DiagnosticsHotnessThreshold = getLastArgUInt64Value(
1087       Args, options::OPT_fdiagnostics_hotness_threshold_EQ, 0);
1088   if (Opts.DiagnosticsHotnessThreshold > 0 && !UsingProfile)
1089     Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
1090         << "-fdiagnostics-hotness-threshold=";
1091 
1092   // If the user requested to use a sample profile for PGO, then the
1093   // backend will need to track source location information so the profile
1094   // can be incorporated into the IR.
1095   if (UsingSampleProfile)
1096     NeedLocTracking = true;
1097 
1098   // If the user requested a flag that requires source locations available in
1099   // the backend, make sure that the backend tracks source location information.
1100   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
1101     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
1102 
1103   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
1104 
1105   // Parse -fsanitize-recover= arguments.
1106   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
1107   parseSanitizerKinds("-fsanitize-recover=",
1108                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
1109                       Opts.SanitizeRecover);
1110   parseSanitizerKinds("-fsanitize-trap=",
1111                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
1112                       Opts.SanitizeTrap);
1113 
1114   Opts.CudaGpuBinaryFileName =
1115       Args.getLastArgValue(OPT_fcuda_include_gpubinary);
1116 
1117   Opts.Backchain = Args.hasArg(OPT_mbackchain);
1118 
1119   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
1120       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
1121 
1122   Opts.EmitVersionIdentMetadata = Args.hasFlag(OPT_Qy, OPT_Qn, true);
1123 
1124   Opts.Addrsig = Args.hasArg(OPT_faddrsig);
1125 
1126   return Success;
1127 }
1128 
1129 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
1130                                       ArgList &Args) {
1131   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
1132   Opts.Targets = Args.getAllArgValues(OPT_MT);
1133   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
1134   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
1135   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
1136   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
1137   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
1138   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
1139   if (Args.hasArg(OPT_show_includes)) {
1140     // Writing both /showIncludes and preprocessor output to stdout
1141     // would produce interleaved output, so use stderr for /showIncludes.
1142     // This behaves the same as cl.exe, when /E, /EP or /P are passed.
1143     if (Args.hasArg(options::OPT_E) || Args.hasArg(options::OPT_P))
1144       Opts.ShowIncludesDest = ShowIncludesDestination::Stderr;
1145     else
1146       Opts.ShowIncludesDest = ShowIncludesDestination::Stdout;
1147   } else {
1148     Opts.ShowIncludesDest = ShowIncludesDestination::None;
1149   }
1150   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
1151   Opts.ModuleDependencyOutputDir =
1152       Args.getLastArgValue(OPT_module_dependency_dir);
1153   if (Args.hasArg(OPT_MV))
1154     Opts.OutputFormat = DependencyOutputFormat::NMake;
1155   // Add sanitizer blacklists as extra dependencies.
1156   // They won't be discovered by the regular preprocessor, so
1157   // we let make / ninja to know about this implicit dependency.
1158   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
1159   // Only the -fmodule-file=<file> form.
1160   for (const auto *A : Args.filtered(OPT_fmodule_file)) {
1161     StringRef Val = A->getValue();
1162     if (Val.find('=') == StringRef::npos)
1163       Opts.ExtraDeps.push_back(Val);
1164   }
1165 }
1166 
1167 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
1168   // Color diagnostics default to auto ("on" if terminal supports) in the driver
1169   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
1170   // Support both clang's -f[no-]color-diagnostics and gcc's
1171   // -f[no-]diagnostics-colors[=never|always|auto].
1172   enum {
1173     Colors_On,
1174     Colors_Off,
1175     Colors_Auto
1176   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
1177   for (auto *A : Args) {
1178     const Option &O = A->getOption();
1179     if (O.matches(options::OPT_fcolor_diagnostics) ||
1180         O.matches(options::OPT_fdiagnostics_color)) {
1181       ShowColors = Colors_On;
1182     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
1183                O.matches(options::OPT_fno_diagnostics_color)) {
1184       ShowColors = Colors_Off;
1185     } else if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
1186       StringRef Value(A->getValue());
1187       if (Value == "always")
1188         ShowColors = Colors_On;
1189       else if (Value == "never")
1190         ShowColors = Colors_Off;
1191       else if (Value == "auto")
1192         ShowColors = Colors_Auto;
1193     }
1194   }
1195   return ShowColors == Colors_On ||
1196          (ShowColors == Colors_Auto &&
1197           llvm::sys::Process::StandardErrHasColors());
1198 }
1199 
1200 static bool checkVerifyPrefixes(const std::vector<std::string> &VerifyPrefixes,
1201                                 DiagnosticsEngine *Diags) {
1202   bool Success = true;
1203   for (const auto &Prefix : VerifyPrefixes) {
1204     // Every prefix must start with a letter and contain only alphanumeric
1205     // characters, hyphens, and underscores.
1206     auto BadChar = std::find_if(Prefix.begin(), Prefix.end(),
1207                                 [](char C){return !isAlphanumeric(C)
1208                                                   && C != '-' && C != '_';});
1209     if (BadChar != Prefix.end() || !isLetter(Prefix[0])) {
1210       Success = false;
1211       if (Diags) {
1212         Diags->Report(diag::err_drv_invalid_value) << "-verify=" << Prefix;
1213         Diags->Report(diag::note_drv_verify_prefix_spelling);
1214       }
1215     }
1216   }
1217   return Success;
1218 }
1219 
1220 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
1221                                 DiagnosticsEngine *Diags,
1222                                 bool DefaultDiagColor, bool DefaultShowOpt) {
1223   bool Success = true;
1224 
1225   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
1226   if (Arg *A =
1227           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
1228     Opts.DiagnosticSerializationFile = A->getValue();
1229   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
1230   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
1231   Opts.Pedantic = Args.hasArg(OPT_pedantic);
1232   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
1233   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
1234   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
1235   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
1236                                  OPT_fno_show_column,
1237                                  /*Default=*/true);
1238   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
1239   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
1240   Opts.AbsolutePath = Args.hasArg(OPT_fdiagnostics_absolute_paths);
1241   Opts.ShowOptionNames =
1242       Args.hasFlag(OPT_fdiagnostics_show_option,
1243                    OPT_fno_diagnostics_show_option, DefaultShowOpt);
1244 
1245   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
1246 
1247   // Default behavior is to not to show note include stacks.
1248   Opts.ShowNoteIncludeStack = false;
1249   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
1250                                OPT_fno_diagnostics_show_note_include_stack))
1251     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
1252       Opts.ShowNoteIncludeStack = true;
1253 
1254   StringRef ShowOverloads =
1255     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
1256   if (ShowOverloads == "best")
1257     Opts.setShowOverloads(Ovl_Best);
1258   else if (ShowOverloads == "all")
1259     Opts.setShowOverloads(Ovl_All);
1260   else {
1261     Success = false;
1262     if (Diags)
1263       Diags->Report(diag::err_drv_invalid_value)
1264       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
1265       << ShowOverloads;
1266   }
1267 
1268   StringRef ShowCategory =
1269     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
1270   if (ShowCategory == "none")
1271     Opts.ShowCategories = 0;
1272   else if (ShowCategory == "id")
1273     Opts.ShowCategories = 1;
1274   else if (ShowCategory == "name")
1275     Opts.ShowCategories = 2;
1276   else {
1277     Success = false;
1278     if (Diags)
1279       Diags->Report(diag::err_drv_invalid_value)
1280       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
1281       << ShowCategory;
1282   }
1283 
1284   StringRef Format =
1285     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
1286   if (Format == "clang")
1287     Opts.setFormat(DiagnosticOptions::Clang);
1288   else if (Format == "msvc")
1289     Opts.setFormat(DiagnosticOptions::MSVC);
1290   else if (Format == "msvc-fallback") {
1291     Opts.setFormat(DiagnosticOptions::MSVC);
1292     Opts.CLFallbackMode = true;
1293   } else if (Format == "vi")
1294     Opts.setFormat(DiagnosticOptions::Vi);
1295   else {
1296     Success = false;
1297     if (Diags)
1298       Diags->Report(diag::err_drv_invalid_value)
1299       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
1300       << Format;
1301   }
1302 
1303   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
1304   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
1305   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
1306   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify) || Args.hasArg(OPT_verify_EQ);
1307   Opts.VerifyPrefixes = Args.getAllArgValues(OPT_verify_EQ);
1308   if (Args.hasArg(OPT_verify))
1309     Opts.VerifyPrefixes.push_back("expected");
1310   // Keep VerifyPrefixes in its original order for the sake of diagnostics, and
1311   // then sort it to prepare for fast lookup using std::binary_search.
1312   if (!checkVerifyPrefixes(Opts.VerifyPrefixes, Diags)) {
1313     Opts.VerifyDiagnostics = false;
1314     Success = false;
1315   }
1316   else
1317     llvm::sort(Opts.VerifyPrefixes.begin(), Opts.VerifyPrefixes.end());
1318   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
1319   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
1320     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
1321     Diags, DiagMask);
1322   if (Args.hasArg(OPT_verify_ignore_unexpected))
1323     DiagMask = DiagnosticLevelMask::All;
1324   Opts.setVerifyIgnoreUnexpected(DiagMask);
1325   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1326   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1327   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1328   Opts.MacroBacktraceLimit =
1329       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1330                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1331   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1332       Args, OPT_ftemplate_backtrace_limit,
1333       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1334   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1335       Args, OPT_fconstexpr_backtrace_limit,
1336       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1337   Opts.SpellCheckingLimit = getLastArgIntValue(
1338       Args, OPT_fspell_checking_limit,
1339       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1340   Opts.SnippetLineLimit = getLastArgIntValue(
1341       Args, OPT_fcaret_diagnostics_max_lines,
1342       DiagnosticOptions::DefaultSnippetLineLimit, Diags);
1343   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1344                                     DiagnosticOptions::DefaultTabStop, Diags);
1345   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1346     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1347     if (Diags)
1348       Diags->Report(diag::warn_ignoring_ftabstop_value)
1349       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1350   }
1351   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1352   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1353   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1354 
1355   return Success;
1356 }
1357 
1358 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1359   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1360 }
1361 
1362 /// Parse the argument to the -ftest-module-file-extension
1363 /// command-line argument.
1364 ///
1365 /// \returns true on error, false on success.
1366 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1367                                             std::string &BlockName,
1368                                             unsigned &MajorVersion,
1369                                             unsigned &MinorVersion,
1370                                             bool &Hashed,
1371                                             std::string &UserInfo) {
1372   SmallVector<StringRef, 5> Args;
1373   Arg.split(Args, ':', 5);
1374   if (Args.size() < 5)
1375     return true;
1376 
1377   BlockName = Args[0];
1378   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1379   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1380   if (Args[3].getAsInteger(2, Hashed)) return true;
1381   if (Args.size() > 4)
1382     UserInfo = Args[4];
1383   return false;
1384 }
1385 
1386 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1387                                    DiagnosticsEngine &Diags,
1388                                    bool &IsHeaderFile) {
1389   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1390   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1391     switch (A->getOption().getID()) {
1392     default:
1393       llvm_unreachable("Invalid option in group!");
1394     case OPT_ast_list:
1395       Opts.ProgramAction = frontend::ASTDeclList; break;
1396     case OPT_ast_dump:
1397     case OPT_ast_dump_all:
1398     case OPT_ast_dump_lookups:
1399       Opts.ProgramAction = frontend::ASTDump; break;
1400     case OPT_ast_print:
1401       Opts.ProgramAction = frontend::ASTPrint; break;
1402     case OPT_ast_view:
1403       Opts.ProgramAction = frontend::ASTView; break;
1404     case OPT_compiler_options_dump:
1405       Opts.ProgramAction = frontend::DumpCompilerOptions; break;
1406     case OPT_dump_raw_tokens:
1407       Opts.ProgramAction = frontend::DumpRawTokens; break;
1408     case OPT_dump_tokens:
1409       Opts.ProgramAction = frontend::DumpTokens; break;
1410     case OPT_S:
1411       Opts.ProgramAction = frontend::EmitAssembly; break;
1412     case OPT_emit_llvm_bc:
1413       Opts.ProgramAction = frontend::EmitBC; break;
1414     case OPT_emit_html:
1415       Opts.ProgramAction = frontend::EmitHTML; break;
1416     case OPT_emit_llvm:
1417       Opts.ProgramAction = frontend::EmitLLVM; break;
1418     case OPT_emit_llvm_only:
1419       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1420     case OPT_emit_codegen_only:
1421       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1422     case OPT_emit_obj:
1423       Opts.ProgramAction = frontend::EmitObj; break;
1424     case OPT_fixit_EQ:
1425       Opts.FixItSuffix = A->getValue();
1426       // fall-through!
1427     case OPT_fixit:
1428       Opts.ProgramAction = frontend::FixIt; break;
1429     case OPT_emit_module:
1430       Opts.ProgramAction = frontend::GenerateModule; break;
1431     case OPT_emit_module_interface:
1432       Opts.ProgramAction = frontend::GenerateModuleInterface; break;
1433     case OPT_emit_pch:
1434       Opts.ProgramAction = frontend::GeneratePCH; break;
1435     case OPT_emit_pth:
1436       Opts.ProgramAction = frontend::GeneratePTH; break;
1437     case OPT_init_only:
1438       Opts.ProgramAction = frontend::InitOnly; break;
1439     case OPT_fsyntax_only:
1440       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1441     case OPT_module_file_info:
1442       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1443     case OPT_verify_pch:
1444       Opts.ProgramAction = frontend::VerifyPCH; break;
1445     case OPT_print_decl_contexts:
1446       Opts.ProgramAction = frontend::PrintDeclContext; break;
1447     case OPT_print_preamble:
1448       Opts.ProgramAction = frontend::PrintPreamble; break;
1449     case OPT_E:
1450       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1451     case OPT_templight_dump:
1452       Opts.ProgramAction = frontend::TemplightDump; break;
1453     case OPT_rewrite_macros:
1454       Opts.ProgramAction = frontend::RewriteMacros; break;
1455     case OPT_rewrite_objc:
1456       Opts.ProgramAction = frontend::RewriteObjC; break;
1457     case OPT_rewrite_test:
1458       Opts.ProgramAction = frontend::RewriteTest; break;
1459     case OPT_analyze:
1460       Opts.ProgramAction = frontend::RunAnalysis; break;
1461     case OPT_migrate:
1462       Opts.ProgramAction = frontend::MigrateSource; break;
1463     case OPT_Eonly:
1464       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1465     }
1466   }
1467 
1468   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1469     Opts.Plugins.emplace_back(A->getValue(0));
1470     Opts.ProgramAction = frontend::PluginAction;
1471     Opts.ActionName = A->getValue();
1472   }
1473   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1474   for (const auto *AA : Args.filtered(OPT_plugin_arg))
1475     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1476 
1477   for (const std::string &Arg :
1478          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1479     std::string BlockName;
1480     unsigned MajorVersion;
1481     unsigned MinorVersion;
1482     bool Hashed;
1483     std::string UserInfo;
1484     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1485                                         MinorVersion, Hashed, UserInfo)) {
1486       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1487 
1488       continue;
1489     }
1490 
1491     // Add the testing module file extension.
1492     Opts.ModuleFileExtensions.push_back(
1493         std::make_shared<TestModuleFileExtension>(
1494             BlockName, MajorVersion, MinorVersion, Hashed, UserInfo));
1495   }
1496 
1497   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1498     Opts.CodeCompletionAt =
1499       ParsedSourceLocation::FromString(A->getValue());
1500     if (Opts.CodeCompletionAt.FileName.empty())
1501       Diags.Report(diag::err_drv_invalid_value)
1502         << A->getAsString(Args) << A->getValue();
1503   }
1504   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1505 
1506   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1507   Opts.Plugins = Args.getAllArgValues(OPT_load);
1508   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1509   Opts.ShowHelp = Args.hasArg(OPT_help);
1510   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1511   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1512   Opts.ShowVersion = Args.hasArg(OPT_version);
1513   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1514   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1515   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1516   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1517   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1518   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1519   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1520   Opts.ASTDumpAll = Args.hasArg(OPT_ast_dump_all);
1521   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1522   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1523   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1524   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1525   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1526   // Only the -fmodule-file=<file> form.
1527   for (const auto *A : Args.filtered(OPT_fmodule_file)) {
1528     StringRef Val = A->getValue();
1529     if (Val.find('=') == StringRef::npos)
1530       Opts.ModuleFiles.push_back(Val);
1531   }
1532   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1533   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1534   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
1535 
1536   Opts.CodeCompleteOpts.IncludeMacros
1537     = Args.hasArg(OPT_code_completion_macros);
1538   Opts.CodeCompleteOpts.IncludeCodePatterns
1539     = Args.hasArg(OPT_code_completion_patterns);
1540   Opts.CodeCompleteOpts.IncludeGlobals
1541     = !Args.hasArg(OPT_no_code_completion_globals);
1542   Opts.CodeCompleteOpts.IncludeNamespaceLevelDecls
1543     = !Args.hasArg(OPT_no_code_completion_ns_level_decls);
1544   Opts.CodeCompleteOpts.IncludeBriefComments
1545     = Args.hasArg(OPT_code_completion_brief_comments);
1546   Opts.CodeCompleteOpts.IncludeFixIts
1547     = Args.hasArg(OPT_code_completion_with_fixits);
1548 
1549   Opts.OverrideRecordLayoutsFile
1550     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1551   Opts.AuxTriple =
1552       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1553   Opts.StatsFile = Args.getLastArgValue(OPT_stats_file);
1554 
1555   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1556                                      OPT_arcmt_modify,
1557                                      OPT_arcmt_migrate)) {
1558     switch (A->getOption().getID()) {
1559     default:
1560       llvm_unreachable("missed a case");
1561     case OPT_arcmt_check:
1562       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1563       break;
1564     case OPT_arcmt_modify:
1565       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1566       break;
1567     case OPT_arcmt_migrate:
1568       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1569       break;
1570     }
1571   }
1572   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1573   Opts.ARCMTMigrateReportOut
1574     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1575   Opts.ARCMTMigrateEmitARCErrors
1576     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1577 
1578   if (Args.hasArg(OPT_objcmt_migrate_literals))
1579     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1580   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1581     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1582   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1583     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1584   if (Args.hasArg(OPT_objcmt_migrate_property))
1585     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1586   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1587     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1588   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1589     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1590   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1591     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1592   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1593     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1594   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1595     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1596   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1597     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1598   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1599     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1600   if (Args.hasArg(OPT_objcmt_atomic_property))
1601     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1602   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1603     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1604   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1605     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1606   if (Args.hasArg(OPT_objcmt_migrate_all))
1607     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1608 
1609   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1610 
1611   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1612       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1613     Diags.Report(diag::err_drv_argument_not_allowed_with)
1614       << "ARC migration" << "ObjC migration";
1615   }
1616 
1617   InputKind DashX(InputKind::Unknown);
1618   if (const Arg *A = Args.getLastArg(OPT_x)) {
1619     StringRef XValue = A->getValue();
1620 
1621     // Parse suffixes: '<lang>(-header|[-module-map][-cpp-output])'.
1622     // FIXME: Supporting '<lang>-header-cpp-output' would be useful.
1623     bool Preprocessed = XValue.consume_back("-cpp-output");
1624     bool ModuleMap = XValue.consume_back("-module-map");
1625     IsHeaderFile =
1626         !Preprocessed && !ModuleMap && XValue.consume_back("-header");
1627 
1628     // Principal languages.
1629     DashX = llvm::StringSwitch<InputKind>(XValue)
1630                 .Case("c", InputKind::C)
1631                 .Case("cl", InputKind::OpenCL)
1632                 .Case("cuda", InputKind::CUDA)
1633                 .Case("hip", InputKind::HIP)
1634                 .Case("c++", InputKind::CXX)
1635                 .Case("objective-c", InputKind::ObjC)
1636                 .Case("objective-c++", InputKind::ObjCXX)
1637                 .Case("renderscript", InputKind::RenderScript)
1638                 .Default(InputKind::Unknown);
1639 
1640     // "objc[++]-cpp-output" is an acceptable synonym for
1641     // "objective-c[++]-cpp-output".
1642     if (DashX.isUnknown() && Preprocessed && !IsHeaderFile && !ModuleMap)
1643       DashX = llvm::StringSwitch<InputKind>(XValue)
1644                   .Case("objc", InputKind::ObjC)
1645                   .Case("objc++", InputKind::ObjCXX)
1646                   .Default(InputKind::Unknown);
1647 
1648     // Some special cases cannot be combined with suffixes.
1649     if (DashX.isUnknown() && !Preprocessed && !ModuleMap && !IsHeaderFile)
1650       DashX = llvm::StringSwitch<InputKind>(XValue)
1651                   .Case("cpp-output", InputKind(InputKind::C).getPreprocessed())
1652                   .Case("assembler-with-cpp", InputKind::Asm)
1653                   .Cases("ast", "pcm",
1654                          InputKind(InputKind::Unknown, InputKind::Precompiled))
1655                   .Case("ir", InputKind::LLVM_IR)
1656                   .Default(InputKind::Unknown);
1657 
1658     if (DashX.isUnknown())
1659       Diags.Report(diag::err_drv_invalid_value)
1660         << A->getAsString(Args) << A->getValue();
1661 
1662     if (Preprocessed)
1663       DashX = DashX.getPreprocessed();
1664     if (ModuleMap)
1665       DashX = DashX.withFormat(InputKind::ModuleMap);
1666   }
1667 
1668   // '-' is the default input if none is given.
1669   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1670   Opts.Inputs.clear();
1671   if (Inputs.empty())
1672     Inputs.push_back("-");
1673   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1674     InputKind IK = DashX;
1675     if (IK.isUnknown()) {
1676       IK = FrontendOptions::getInputKindForExtension(
1677         StringRef(Inputs[i]).rsplit('.').second);
1678       // FIXME: Warn on this?
1679       if (IK.isUnknown())
1680         IK = InputKind::C;
1681       // FIXME: Remove this hack.
1682       if (i == 0)
1683         DashX = IK;
1684     }
1685 
1686     // The -emit-module action implicitly takes a module map.
1687     if (Opts.ProgramAction == frontend::GenerateModule &&
1688         IK.getFormat() == InputKind::Source)
1689       IK = IK.withFormat(InputKind::ModuleMap);
1690 
1691     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1692   }
1693 
1694   return DashX;
1695 }
1696 
1697 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1698                                                  void *MainAddr) {
1699   std::string ClangExecutable =
1700       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1701   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1702 
1703   // Compute the path to the resource directory.
1704   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1705   SmallString<128> P(Dir);
1706   if (ClangResourceDir != "")
1707     llvm::sys::path::append(P, ClangResourceDir);
1708   else
1709     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1710                             "clang", CLANG_VERSION_STRING);
1711 
1712   return P.str();
1713 }
1714 
1715 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
1716                                   const std::string &WorkingDir) {
1717   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1718   Opts.Verbose = Args.hasArg(OPT_v);
1719   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1720   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1721   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1722   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1723     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1724   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1725 
1726   // Canonicalize -fmodules-cache-path before storing it.
1727   SmallString<128> P(Args.getLastArgValue(OPT_fmodules_cache_path));
1728   if (!(P.empty() || llvm::sys::path::is_absolute(P))) {
1729     if (WorkingDir.empty())
1730       llvm::sys::fs::make_absolute(P);
1731     else
1732       llvm::sys::fs::make_absolute(WorkingDir, P);
1733   }
1734   llvm::sys::path::remove_dots(P);
1735   Opts.ModuleCachePath = P.str();
1736 
1737   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1738   // Only the -fmodule-file=<name>=<file> form.
1739   for (const auto *A : Args.filtered(OPT_fmodule_file)) {
1740     StringRef Val = A->getValue();
1741     if (Val.find('=') != StringRef::npos)
1742       Opts.PrebuiltModuleFiles.insert(Val.split('='));
1743   }
1744   for (const auto *A : Args.filtered(OPT_fprebuilt_module_path))
1745     Opts.AddPrebuiltModulePath(A->getValue());
1746   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1747   Opts.ModulesHashContent = Args.hasArg(OPT_fmodules_hash_content);
1748   Opts.ModulesValidateDiagnosticOptions =
1749       !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
1750   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1751   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1752   Opts.ModuleCachePruneInterval =
1753       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1754   Opts.ModuleCachePruneAfter =
1755       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1756   Opts.ModulesValidateOncePerBuildSession =
1757       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1758   Opts.BuildSessionTimestamp =
1759       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1760   Opts.ModulesValidateSystemHeaders =
1761       Args.hasArg(OPT_fmodules_validate_system_headers);
1762   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1763     Opts.ModuleFormat = A->getValue();
1764 
1765   for (const auto *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1766     StringRef MacroDef = A->getValue();
1767     Opts.ModulesIgnoreMacros.insert(
1768         llvm::CachedHashString(MacroDef.split('=').first));
1769   }
1770 
1771   // Add -I..., -F..., and -index-header-map options in order.
1772   bool IsIndexHeaderMap = false;
1773   bool IsSysrootSpecified =
1774       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1775   for (const auto *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1776     if (A->getOption().matches(OPT_index_header_map)) {
1777       // -index-header-map applies to the next -I or -F.
1778       IsIndexHeaderMap = true;
1779       continue;
1780     }
1781 
1782     frontend::IncludeDirGroup Group =
1783         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1784 
1785     bool IsFramework = A->getOption().matches(OPT_F);
1786     std::string Path = A->getValue();
1787 
1788     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1789       SmallString<32> Buffer;
1790       llvm::sys::path::append(Buffer, Opts.Sysroot,
1791                               llvm::StringRef(A->getValue()).substr(1));
1792       Path = Buffer.str();
1793     }
1794 
1795     Opts.AddPath(Path, Group, IsFramework,
1796                  /*IgnoreSysroot*/ true);
1797     IsIndexHeaderMap = false;
1798   }
1799 
1800   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1801   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1802   for (const auto *A :
1803        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1804     if (A->getOption().matches(OPT_iprefix))
1805       Prefix = A->getValue();
1806     else if (A->getOption().matches(OPT_iwithprefix))
1807       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1808     else
1809       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1810   }
1811 
1812   for (const auto *A : Args.filtered(OPT_idirafter))
1813     Opts.AddPath(A->getValue(), frontend::After, false, true);
1814   for (const auto *A : Args.filtered(OPT_iquote))
1815     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1816   for (const auto *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1817     Opts.AddPath(A->getValue(), frontend::System, false,
1818                  !A->getOption().matches(OPT_iwithsysroot));
1819   for (const auto *A : Args.filtered(OPT_iframework))
1820     Opts.AddPath(A->getValue(), frontend::System, true, true);
1821   for (const auto *A : Args.filtered(OPT_iframeworkwithsysroot))
1822     Opts.AddPath(A->getValue(), frontend::System, /*IsFramework=*/true,
1823                  /*IgnoreSysRoot=*/false);
1824 
1825   // Add the paths for the various language specific isystem flags.
1826   for (const auto *A : Args.filtered(OPT_c_isystem))
1827     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1828   for (const auto *A : Args.filtered(OPT_cxx_isystem))
1829     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1830   for (const auto *A : Args.filtered(OPT_objc_isystem))
1831     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1832   for (const auto *A : Args.filtered(OPT_objcxx_isystem))
1833     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1834 
1835   // Add the internal paths from a driver that detects standard include paths.
1836   for (const auto *A :
1837        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1838     frontend::IncludeDirGroup Group = frontend::System;
1839     if (A->getOption().matches(OPT_internal_externc_isystem))
1840       Group = frontend::ExternCSystem;
1841     Opts.AddPath(A->getValue(), Group, false, true);
1842   }
1843 
1844   // Add the path prefixes which are implicitly treated as being system headers.
1845   for (const auto *A :
1846        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1847     Opts.AddSystemHeaderPrefix(
1848         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1849 
1850   for (const auto *A : Args.filtered(OPT_ivfsoverlay))
1851     Opts.AddVFSOverlayFile(A->getValue());
1852 }
1853 
1854 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1855                                          const llvm::Triple &T,
1856                                          PreprocessorOptions &PPOpts,
1857                                          LangStandard::Kind LangStd) {
1858   // Set some properties which depend solely on the input kind; it would be nice
1859   // to move these to the language standard, and have the driver resolve the
1860   // input kind + language standard.
1861   //
1862   // FIXME: Perhaps a better model would be for a single source file to have
1863   // multiple language standards (C / C++ std, ObjC std, OpenCL std, OpenMP std)
1864   // simultaneously active?
1865   if (IK.getLanguage() == InputKind::Asm) {
1866     Opts.AsmPreprocessor = 1;
1867   } else if (IK.isObjectiveC()) {
1868     Opts.ObjC1 = Opts.ObjC2 = 1;
1869   }
1870 
1871   if (LangStd == LangStandard::lang_unspecified) {
1872     // Based on the base language, pick one.
1873     switch (IK.getLanguage()) {
1874     case InputKind::Unknown:
1875     case InputKind::LLVM_IR:
1876       llvm_unreachable("Invalid input kind!");
1877     case InputKind::OpenCL:
1878       LangStd = LangStandard::lang_opencl10;
1879       break;
1880     case InputKind::CUDA:
1881       LangStd = LangStandard::lang_cuda;
1882       break;
1883     case InputKind::Asm:
1884     case InputKind::C:
1885 #if defined(CLANG_DEFAULT_STD_C)
1886       LangStd = CLANG_DEFAULT_STD_C;
1887 #else
1888       // The PS4 uses C99 as the default C standard.
1889       if (T.isPS4())
1890         LangStd = LangStandard::lang_gnu99;
1891       else
1892         LangStd = LangStandard::lang_gnu11;
1893 #endif
1894       break;
1895     case InputKind::ObjC:
1896 #if defined(CLANG_DEFAULT_STD_C)
1897       LangStd = CLANG_DEFAULT_STD_C;
1898 #else
1899       LangStd = LangStandard::lang_gnu11;
1900 #endif
1901       break;
1902     case InputKind::CXX:
1903     case InputKind::ObjCXX:
1904 #if defined(CLANG_DEFAULT_STD_CXX)
1905       LangStd = CLANG_DEFAULT_STD_CXX;
1906 #else
1907       LangStd = LangStandard::lang_gnucxx14;
1908 #endif
1909       break;
1910     case InputKind::RenderScript:
1911       LangStd = LangStandard::lang_c99;
1912       break;
1913     case InputKind::HIP:
1914       LangStd = LangStandard::lang_hip;
1915       break;
1916     }
1917   }
1918 
1919   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1920   Opts.LineComment = Std.hasLineComments();
1921   Opts.C99 = Std.isC99();
1922   Opts.C11 = Std.isC11();
1923   Opts.C17 = Std.isC17();
1924   Opts.CPlusPlus = Std.isCPlusPlus();
1925   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1926   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1927   Opts.CPlusPlus17 = Std.isCPlusPlus17();
1928   Opts.CPlusPlus2a = Std.isCPlusPlus2a();
1929   Opts.Digraphs = Std.hasDigraphs();
1930   Opts.GNUMode = Std.isGNUMode();
1931   Opts.GNUInline = !Opts.C99 && !Opts.CPlusPlus;
1932   Opts.HexFloats = Std.hasHexFloats();
1933   Opts.ImplicitInt = Std.hasImplicitInt();
1934 
1935   // Set OpenCL Version.
1936   Opts.OpenCL = Std.isOpenCL();
1937   if (LangStd == LangStandard::lang_opencl10)
1938     Opts.OpenCLVersion = 100;
1939   else if (LangStd == LangStandard::lang_opencl11)
1940     Opts.OpenCLVersion = 110;
1941   else if (LangStd == LangStandard::lang_opencl12)
1942     Opts.OpenCLVersion = 120;
1943   else if (LangStd == LangStandard::lang_opencl20)
1944     Opts.OpenCLVersion = 200;
1945   else if (LangStd == LangStandard::lang_openclcpp)
1946     Opts.OpenCLCPlusPlusVersion = 100;
1947 
1948   // OpenCL has some additional defaults.
1949   if (Opts.OpenCL) {
1950     Opts.AltiVec = 0;
1951     Opts.ZVector = 0;
1952     Opts.LaxVectorConversions = 0;
1953     Opts.setDefaultFPContractMode(LangOptions::FPC_On);
1954     Opts.NativeHalfType = 1;
1955     Opts.NativeHalfArgsAndReturns = 1;
1956     Opts.OpenCLCPlusPlus = Opts.CPlusPlus;
1957     // Include default header file for OpenCL.
1958     if (Opts.IncludeDefaultHeader) {
1959       PPOpts.Includes.push_back("opencl-c.h");
1960     }
1961   }
1962 
1963   Opts.HIP = IK.getLanguage() == InputKind::HIP;
1964   Opts.CUDA = IK.getLanguage() == InputKind::CUDA || Opts.HIP;
1965   if (Opts.CUDA)
1966     // Set default FP_CONTRACT to FAST.
1967     Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
1968 
1969   Opts.RenderScript = IK.getLanguage() == InputKind::RenderScript;
1970   if (Opts.RenderScript) {
1971     Opts.NativeHalfType = 1;
1972     Opts.NativeHalfArgsAndReturns = 1;
1973   }
1974 
1975   // OpenCL and C++ both have bool, true, false keywords.
1976   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1977 
1978   // OpenCL has half keyword
1979   Opts.Half = Opts.OpenCL;
1980 
1981   // C++ has wchar_t keyword.
1982   Opts.WChar = Opts.CPlusPlus;
1983 
1984   Opts.GNUKeywords = Opts.GNUMode;
1985   Opts.CXXOperatorNames = Opts.CPlusPlus;
1986 
1987   Opts.AlignedAllocation = Opts.CPlusPlus17;
1988 
1989   Opts.DollarIdents = !Opts.AsmPreprocessor;
1990 }
1991 
1992 /// Attempt to parse a visibility value out of the given argument.
1993 static Visibility parseVisibility(Arg *arg, ArgList &args,
1994                                   DiagnosticsEngine &diags) {
1995   StringRef value = arg->getValue();
1996   if (value == "default") {
1997     return DefaultVisibility;
1998   } else if (value == "hidden" || value == "internal") {
1999     return HiddenVisibility;
2000   } else if (value == "protected") {
2001     // FIXME: diagnose if target does not support protected visibility
2002     return ProtectedVisibility;
2003   }
2004 
2005   diags.Report(diag::err_drv_invalid_value)
2006     << arg->getAsString(args) << value;
2007   return DefaultVisibility;
2008 }
2009 
2010 /// Check if input file kind and language standard are compatible.
2011 static bool IsInputCompatibleWithStandard(InputKind IK,
2012                                           const LangStandard &S) {
2013   switch (IK.getLanguage()) {
2014   case InputKind::Unknown:
2015   case InputKind::LLVM_IR:
2016     llvm_unreachable("should not parse language flags for this input");
2017 
2018   case InputKind::C:
2019   case InputKind::ObjC:
2020   case InputKind::RenderScript:
2021     return S.getLanguage() == InputKind::C;
2022 
2023   case InputKind::OpenCL:
2024     return S.getLanguage() == InputKind::OpenCL;
2025 
2026   case InputKind::CXX:
2027   case InputKind::ObjCXX:
2028     return S.getLanguage() == InputKind::CXX;
2029 
2030   case InputKind::CUDA:
2031     // FIXME: What -std= values should be permitted for CUDA compilations?
2032     return S.getLanguage() == InputKind::CUDA ||
2033            S.getLanguage() == InputKind::CXX;
2034 
2035   case InputKind::HIP:
2036     return S.getLanguage() == InputKind::CXX ||
2037            S.getLanguage() == InputKind::HIP;
2038 
2039   case InputKind::Asm:
2040     // Accept (and ignore) all -std= values.
2041     // FIXME: The -std= value is not ignored; it affects the tokenization
2042     // and preprocessing rules if we're preprocessing this asm input.
2043     return true;
2044   }
2045 
2046   llvm_unreachable("unexpected input language");
2047 }
2048 
2049 /// Get language name for given input kind.
2050 static const StringRef GetInputKindName(InputKind IK) {
2051   switch (IK.getLanguage()) {
2052   case InputKind::C:
2053     return "C";
2054   case InputKind::ObjC:
2055     return "Objective-C";
2056   case InputKind::CXX:
2057     return "C++";
2058   case InputKind::ObjCXX:
2059     return "Objective-C++";
2060   case InputKind::OpenCL:
2061     return "OpenCL";
2062   case InputKind::CUDA:
2063     return "CUDA";
2064   case InputKind::RenderScript:
2065     return "RenderScript";
2066   case InputKind::HIP:
2067     return "HIP";
2068 
2069   case InputKind::Asm:
2070     return "Asm";
2071   case InputKind::LLVM_IR:
2072     return "LLVM IR";
2073 
2074   case InputKind::Unknown:
2075     break;
2076   }
2077   llvm_unreachable("unknown input language");
2078 }
2079 
2080 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
2081                           const TargetOptions &TargetOpts,
2082                           PreprocessorOptions &PPOpts,
2083                           DiagnosticsEngine &Diags) {
2084   // FIXME: Cleanup per-file based stuff.
2085   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
2086   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
2087     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
2088 #define LANGSTANDARD(id, name, lang, desc, features) \
2089       .Case(name, LangStandard::lang_##id)
2090 #define LANGSTANDARD_ALIAS(id, alias) \
2091       .Case(alias, LangStandard::lang_##id)
2092 #include "clang/Frontend/LangStandards.def"
2093       .Default(LangStandard::lang_unspecified);
2094     if (LangStd == LangStandard::lang_unspecified) {
2095       Diags.Report(diag::err_drv_invalid_value)
2096         << A->getAsString(Args) << A->getValue();
2097       // Report supported standards with short description.
2098       for (unsigned KindValue = 0;
2099            KindValue != LangStandard::lang_unspecified;
2100            ++KindValue) {
2101         const LangStandard &Std = LangStandard::getLangStandardForKind(
2102           static_cast<LangStandard::Kind>(KindValue));
2103         if (IsInputCompatibleWithStandard(IK, Std)) {
2104           auto Diag = Diags.Report(diag::note_drv_use_standard);
2105           Diag << Std.getName() << Std.getDescription();
2106           unsigned NumAliases = 0;
2107 #define LANGSTANDARD(id, name, lang, desc, features)
2108 #define LANGSTANDARD_ALIAS(id, alias) \
2109           if (KindValue == LangStandard::lang_##id) ++NumAliases;
2110 #define LANGSTANDARD_ALIAS_DEPR(id, alias)
2111 #include "clang/Frontend/LangStandards.def"
2112           Diag << NumAliases;
2113 #define LANGSTANDARD(id, name, lang, desc, features)
2114 #define LANGSTANDARD_ALIAS(id, alias) \
2115           if (KindValue == LangStandard::lang_##id) Diag << alias;
2116 #define LANGSTANDARD_ALIAS_DEPR(id, alias)
2117 #include "clang/Frontend/LangStandards.def"
2118         }
2119       }
2120     } else {
2121       // Valid standard, check to make sure language and standard are
2122       // compatible.
2123       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
2124       if (!IsInputCompatibleWithStandard(IK, Std)) {
2125         Diags.Report(diag::err_drv_argument_not_allowed_with)
2126           << A->getAsString(Args) << GetInputKindName(IK);
2127       }
2128     }
2129   }
2130 
2131   if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
2132     StringRef Name = A->getValue();
2133     if (Name == "full" || Name == "branch") {
2134       Opts.CFProtectionBranch = 1;
2135     }
2136   }
2137   // -cl-std only applies for OpenCL language standards.
2138   // Override the -std option in this case.
2139   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
2140     LangStandard::Kind OpenCLLangStd
2141       = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
2142         .Cases("cl", "CL", LangStandard::lang_opencl10)
2143         .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
2144         .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
2145         .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
2146         .Case("c++", LangStandard::lang_openclcpp)
2147         .Default(LangStandard::lang_unspecified);
2148 
2149     if (OpenCLLangStd == LangStandard::lang_unspecified) {
2150       Diags.Report(diag::err_drv_invalid_value)
2151         << A->getAsString(Args) << A->getValue();
2152     }
2153     else
2154       LangStd = OpenCLLangStd;
2155   }
2156 
2157   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
2158 
2159   llvm::Triple T(TargetOpts.Triple);
2160   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
2161 
2162   // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
2163   // This option should be deprecated for CL > 1.0 because
2164   // this option was added for compatibility with OpenCL 1.0.
2165   if (Args.getLastArg(OPT_cl_strict_aliasing)
2166        && Opts.OpenCLVersion > 100) {
2167     Diags.Report(diag::warn_option_invalid_ocl_version)
2168         << Opts.getOpenCLVersionTuple().getAsString()
2169         << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
2170   }
2171 
2172   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
2173   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
2174   // while a subset (the non-C++ GNU keywords) is provided by GCC's
2175   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
2176   // name, as it doesn't seem a useful distinction.
2177   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
2178                                   Opts.GNUKeywords);
2179 
2180   Opts.Digraphs = Args.hasFlag(OPT_fdigraphs, OPT_fno_digraphs, Opts.Digraphs);
2181 
2182   if (Args.hasArg(OPT_fno_operator_names))
2183     Opts.CXXOperatorNames = 0;
2184 
2185   if (Args.hasArg(OPT_fcuda_is_device))
2186     Opts.CUDAIsDevice = 1;
2187 
2188   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
2189     Opts.CUDAAllowVariadicFunctions = 1;
2190 
2191   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
2192     Opts.CUDAHostDeviceConstexpr = 0;
2193 
2194   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
2195     Opts.CUDADeviceFlushDenormalsToZero = 1;
2196 
2197   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
2198     Opts.CUDADeviceApproxTranscendentals = 1;
2199 
2200   Opts.CUDARelocatableDeviceCode = Args.hasArg(OPT_fcuda_rdc);
2201 
2202   if (Opts.ObjC1) {
2203     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
2204       StringRef value = arg->getValue();
2205       if (Opts.ObjCRuntime.tryParse(value))
2206         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
2207     }
2208 
2209     if (Args.hasArg(OPT_fobjc_gc_only))
2210       Opts.setGC(LangOptions::GCOnly);
2211     else if (Args.hasArg(OPT_fobjc_gc))
2212       Opts.setGC(LangOptions::HybridGC);
2213     else if (Args.hasArg(OPT_fobjc_arc)) {
2214       Opts.ObjCAutoRefCount = 1;
2215       if (!Opts.ObjCRuntime.allowsARC())
2216         Diags.Report(diag::err_arc_unsupported_on_runtime);
2217     }
2218 
2219     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
2220     // whether the feature is actually enabled.  This is predominantly
2221     // determined by -fobjc-runtime, but we allow it to be overridden
2222     // from the command line for testing purposes.
2223     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
2224       Opts.ObjCWeakRuntime = 1;
2225     else
2226       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
2227 
2228     // ObjCWeak determines whether __weak is actually enabled.
2229     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
2230     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
2231       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
2232         assert(!Opts.ObjCWeak);
2233       } else if (Opts.getGC() != LangOptions::NonGC) {
2234         Diags.Report(diag::err_objc_weak_with_gc);
2235       } else if (!Opts.ObjCWeakRuntime) {
2236         Diags.Report(diag::err_objc_weak_unsupported);
2237       } else {
2238         Opts.ObjCWeak = 1;
2239       }
2240     } else if (Opts.ObjCAutoRefCount) {
2241       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
2242     }
2243 
2244     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
2245       Opts.ObjCInferRelatedResultType = 0;
2246 
2247     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
2248       Opts.ObjCSubscriptingLegacyRuntime =
2249         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
2250   }
2251 
2252   if (Args.hasArg(OPT_fgnu89_inline)) {
2253     if (Opts.CPlusPlus)
2254       Diags.Report(diag::err_drv_argument_not_allowed_with)
2255         << "-fgnu89-inline" << GetInputKindName(IK);
2256     else
2257       Opts.GNUInline = 1;
2258   }
2259 
2260   if (Args.hasArg(OPT_fapple_kext)) {
2261     if (!Opts.CPlusPlus)
2262       Diags.Report(diag::warn_c_kext);
2263     else
2264       Opts.AppleKext = 1;
2265   }
2266 
2267   if (Args.hasArg(OPT_print_ivar_layout))
2268     Opts.ObjCGCBitmapPrint = 1;
2269   if (Args.hasArg(OPT_fno_constant_cfstrings))
2270     Opts.NoConstantCFStrings = 1;
2271 
2272   if (Args.hasArg(OPT_fzvector))
2273     Opts.ZVector = 1;
2274 
2275   if (Args.hasArg(OPT_pthread))
2276     Opts.POSIXThreads = 1;
2277 
2278   // The value-visibility mode defaults to "default".
2279   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
2280     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
2281   } else {
2282     Opts.setValueVisibilityMode(DefaultVisibility);
2283   }
2284 
2285   // The type-visibility mode defaults to the value-visibility mode.
2286   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
2287     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
2288   } else {
2289     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
2290   }
2291 
2292   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
2293     Opts.InlineVisibilityHidden = 1;
2294 
2295   if (Args.hasArg(OPT_ftrapv)) {
2296     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
2297     // Set the handler, if one is specified.
2298     Opts.OverflowHandler =
2299         Args.getLastArgValue(OPT_ftrapv_handler);
2300   }
2301   else if (Args.hasArg(OPT_fwrapv))
2302     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
2303 
2304   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
2305   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
2306   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
2307   Opts.MSCompatibilityVersion = 0;
2308   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
2309     VersionTuple VT;
2310     if (VT.tryParse(A->getValue()))
2311       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2312                                                 << A->getValue();
2313     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
2314                                   VT.getMinor().getValueOr(0) * 100000 +
2315                                   VT.getSubminor().getValueOr(0);
2316   }
2317 
2318   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
2319   // is specified, or -std is set to a conforming mode.
2320   // Trigraphs are disabled by default in c++1z onwards.
2321   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus17;
2322   Opts.Trigraphs =
2323       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
2324 
2325   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
2326                                    OPT_fno_dollars_in_identifiers,
2327                                    Opts.DollarIdents);
2328   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
2329   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
2330   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
2331   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
2332   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
2333                                    Opts.ConstStrings);
2334   if (Args.hasArg(OPT_fno_lax_vector_conversions))
2335     Opts.LaxVectorConversions = 0;
2336   if (Args.hasArg(OPT_fno_threadsafe_statics))
2337     Opts.ThreadsafeStatics = 0;
2338   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
2339   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
2340   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
2341 
2342   // -ffixed-point
2343   Opts.FixedPoint =
2344       Args.hasFlag(OPT_ffixed_point, OPT_fno_fixed_point, /*Default=*/false) &&
2345       !Opts.CPlusPlus;
2346   Opts.PaddingOnUnsignedFixedPoint =
2347       Args.hasFlag(OPT_fpadding_on_unsigned_fixed_point,
2348                    OPT_fno_padding_on_unsigned_fixed_point,
2349                    /*Default=*/false) &&
2350       Opts.FixedPoint;
2351 
2352   // Handle exception personalities
2353   Arg *A = Args.getLastArg(options::OPT_fsjlj_exceptions,
2354                            options::OPT_fseh_exceptions,
2355                            options::OPT_fdwarf_exceptions);
2356   if (A) {
2357     const Option &Opt = A->getOption();
2358     llvm::Triple T(TargetOpts.Triple);
2359     if (T.isWindowsMSVCEnvironment())
2360       Diags.Report(diag::err_fe_invalid_exception_model)
2361           << Opt.getName() << T.str();
2362 
2363     Opts.SjLjExceptions = Opt.matches(options::OPT_fsjlj_exceptions);
2364     Opts.SEHExceptions = Opt.matches(options::OPT_fseh_exceptions);
2365     Opts.DWARFExceptions = Opt.matches(options::OPT_fdwarf_exceptions);
2366   }
2367 
2368   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
2369   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
2370 
2371   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
2372   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
2373   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
2374     && Opts.OpenCLVersion == 200);
2375   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
2376   Opts.CoroutinesTS = Args.hasArg(OPT_fcoroutines_ts);
2377 
2378   // Enable [[]] attributes in C++11 by default.
2379   Opts.DoubleSquareBracketAttributes =
2380       Args.hasFlag(OPT_fdouble_square_bracket_attributes,
2381                    OPT_fno_double_square_bracket_attributes, Opts.CPlusPlus11);
2382 
2383   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
2384   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
2385   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
2386   Opts.ModulesDeclUse =
2387       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
2388   Opts.ModulesLocalVisibility =
2389       Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS;
2390   Opts.ModulesCodegen = Args.hasArg(OPT_fmodules_codegen);
2391   Opts.ModulesDebugInfo = Args.hasArg(OPT_fmodules_debuginfo);
2392   Opts.ModulesSearchAll = Opts.Modules &&
2393     !Args.hasArg(OPT_fno_modules_search_all) &&
2394     Args.hasArg(OPT_fmodules_search_all);
2395   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
2396   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
2397   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
2398   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
2399   Opts.Char8 = Args.hasArg(OPT_fchar8__t);
2400   if (const Arg *A = Args.getLastArg(OPT_fwchar_type_EQ)) {
2401     Opts.WCharSize = llvm::StringSwitch<unsigned>(A->getValue())
2402                          .Case("char", 1)
2403                          .Case("short", 2)
2404                          .Case("int", 4)
2405                          .Default(0);
2406     if (Opts.WCharSize == 0)
2407       Diags.Report(diag::err_fe_invalid_wchar_type) << A->getValue();
2408   }
2409   Opts.WCharIsSigned = Args.hasFlag(OPT_fsigned_wchar, OPT_fno_signed_wchar, true);
2410   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
2411   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
2412   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
2413   if (!Opts.NoBuiltin)
2414     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
2415   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
2416   Opts.RelaxedTemplateTemplateArgs =
2417       Args.hasArg(OPT_frelaxed_template_template_args);
2418   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
2419   Opts.AlignedAllocation =
2420       Args.hasFlag(OPT_faligned_allocation, OPT_fno_aligned_allocation,
2421                    Opts.AlignedAllocation);
2422   Opts.AlignedAllocationUnavailable =
2423       Opts.AlignedAllocation && Args.hasArg(OPT_aligned_alloc_unavailable);
2424   Opts.NewAlignOverride =
2425       getLastArgIntValue(Args, OPT_fnew_alignment_EQ, 0, Diags);
2426   if (Opts.NewAlignOverride && !llvm::isPowerOf2_32(Opts.NewAlignOverride)) {
2427     Arg *A = Args.getLastArg(OPT_fnew_alignment_EQ);
2428     Diags.Report(diag::err_fe_invalid_alignment) << A->getAsString(Args)
2429                                                  << A->getValue();
2430     Opts.NewAlignOverride = 0;
2431   }
2432   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
2433   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
2434   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
2435   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
2436   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
2437   Opts.InstantiationDepth =
2438       getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
2439   Opts.ArrowDepth =
2440       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
2441   Opts.ConstexprCallDepth =
2442       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
2443   Opts.ConstexprStepLimit =
2444       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
2445   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
2446   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
2447   Opts.NumLargeByValueCopy =
2448       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
2449   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
2450   Opts.ObjCConstantStringClass =
2451     Args.getLastArgValue(OPT_fconstant_string_class);
2452   Opts.ObjCDefaultSynthProperties =
2453     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
2454   Opts.EncodeExtendedBlockSig =
2455     Args.hasArg(OPT_fencode_extended_block_signature);
2456   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
2457   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
2458   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
2459   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
2460   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2461   Opts.PIE = Args.hasArg(OPT_pic_is_pie);
2462   Opts.Static = Args.hasArg(OPT_static_define);
2463   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
2464   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
2465                         || Args.hasArg(OPT_fdump_record_layouts);
2466   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
2467   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
2468   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
2469   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
2470   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
2471   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
2472   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
2473   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
2474   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
2475   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
2476   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
2477   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
2478   Opts.ModuleName = Args.getLastArgValue(OPT_fmodule_name_EQ);
2479   Opts.CurrentModule = Opts.ModuleName;
2480   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
2481   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
2482   llvm::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
2483   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
2484   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
2485   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
2486   // is enabled.
2487   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
2488                             | Opts.NativeHalfArgsAndReturns;
2489   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
2490 
2491   // __declspec is enabled by default for the PS4 by the driver, and also
2492   // enabled for Microsoft Extensions or Borland Extensions, here.
2493   //
2494   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
2495   // CUDA extension. However, it is required for supporting
2496   // __clang_cuda_builtin_vars.h, which uses __declspec(property). Once that has
2497   // been rewritten in terms of something more generic, remove the Opts.CUDA
2498   // term here.
2499   Opts.DeclSpecKeyword =
2500       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
2501                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
2502 
2503   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
2504     switch (llvm::StringSwitch<unsigned>(A->getValue())
2505       .Case("target", LangOptions::ASMM_Target)
2506       .Case("no", LangOptions::ASMM_Off)
2507       .Case("yes", LangOptions::ASMM_On)
2508       .Default(255)) {
2509     default:
2510       Diags.Report(diag::err_drv_invalid_value)
2511         << "-faddress-space-map-mangling=" << A->getValue();
2512       break;
2513     case LangOptions::ASMM_Target:
2514       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
2515       break;
2516     case LangOptions::ASMM_On:
2517       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
2518       break;
2519     case LangOptions::ASMM_Off:
2520       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
2521       break;
2522     }
2523   }
2524 
2525   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
2526     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
2527         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
2528             A->getValue())
2529             .Case("single",
2530                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
2531             .Case("multiple",
2532                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
2533             .Case("virtual",
2534                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
2535             .Default(LangOptions::PPTMK_BestCase);
2536     if (InheritanceModel == LangOptions::PPTMK_BestCase)
2537       Diags.Report(diag::err_drv_invalid_value)
2538           << "-fms-memptr-rep=" << A->getValue();
2539 
2540     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
2541   }
2542 
2543   // Check for MS default calling conventions being specified.
2544   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
2545     LangOptions::DefaultCallingConvention DefaultCC =
2546         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(A->getValue())
2547             .Case("cdecl", LangOptions::DCC_CDecl)
2548             .Case("fastcall", LangOptions::DCC_FastCall)
2549             .Case("stdcall", LangOptions::DCC_StdCall)
2550             .Case("vectorcall", LangOptions::DCC_VectorCall)
2551             .Case("regcall", LangOptions::DCC_RegCall)
2552             .Default(LangOptions::DCC_None);
2553     if (DefaultCC == LangOptions::DCC_None)
2554       Diags.Report(diag::err_drv_invalid_value)
2555           << "-fdefault-calling-conv=" << A->getValue();
2556 
2557     llvm::Triple T(TargetOpts.Triple);
2558     llvm::Triple::ArchType Arch = T.getArch();
2559     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2560                       DefaultCC == LangOptions::DCC_StdCall) &&
2561                      Arch != llvm::Triple::x86;
2562     emitError |= (DefaultCC == LangOptions::DCC_VectorCall ||
2563                   DefaultCC == LangOptions::DCC_RegCall) &&
2564                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2565     if (emitError)
2566       Diags.Report(diag::err_drv_argument_not_allowed_with)
2567           << A->getSpelling() << T.getTriple();
2568     else
2569       Opts.setDefaultCallingConv(DefaultCC);
2570   }
2571 
2572   // -mrtd option
2573   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2574     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2575       Diags.Report(diag::err_drv_argument_not_allowed_with)
2576           << A->getSpelling() << "-fdefault-calling-conv";
2577     else {
2578       llvm::Triple T(TargetOpts.Triple);
2579       if (T.getArch() != llvm::Triple::x86)
2580         Diags.Report(diag::err_drv_argument_not_allowed_with)
2581             << A->getSpelling() << T.getTriple();
2582       else
2583         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2584     }
2585   }
2586 
2587   // Check if -fopenmp is specified.
2588   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2589   // Check if -fopenmp-simd is specified.
2590   bool IsSimdSpecified =
2591       Args.hasFlag(options::OPT_fopenmp_simd, options::OPT_fno_openmp_simd,
2592                    /*Default=*/false);
2593   Opts.OpenMPSimd = !Opts.OpenMP && IsSimdSpecified;
2594   Opts.OpenMPUseTLS =
2595       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2596   Opts.OpenMPIsDevice =
2597       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2598 
2599   if (Opts.OpenMP || Opts.OpenMPSimd) {
2600     if (int Version =
2601             getLastArgIntValue(Args, OPT_fopenmp_version_EQ,
2602                                IsSimdSpecified ? 45 : Opts.OpenMP, Diags))
2603       Opts.OpenMP = Version;
2604     else if (IsSimdSpecified)
2605       Opts.OpenMP = 45;
2606     // Provide diagnostic when a given target is not expected to be an OpenMP
2607     // device or host.
2608     if (!Opts.OpenMPIsDevice) {
2609       switch (T.getArch()) {
2610       default:
2611         break;
2612       // Add unsupported host targets here:
2613       case llvm::Triple::nvptx:
2614       case llvm::Triple::nvptx64:
2615         Diags.Report(diag::err_drv_omp_host_target_not_supported)
2616             << TargetOpts.Triple;
2617         break;
2618       }
2619     }
2620   }
2621 
2622   // Set the flag to prevent the implementation from emitting device exception
2623   // handling code for those requiring so.
2624   Opts.OpenMPHostCXXExceptions = Opts.Exceptions && Opts.CXXExceptions;
2625   if ((Opts.OpenMPIsDevice && T.isNVPTX()) || Opts.OpenCLCPlusPlus) {
2626     Opts.Exceptions = 0;
2627     Opts.CXXExceptions = 0;
2628   }
2629 
2630   // Get the OpenMP target triples if any.
2631   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
2632 
2633     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2634       llvm::Triple TT(A->getValue(i));
2635 
2636       if (TT.getArch() == llvm::Triple::UnknownArch ||
2637           !(TT.getArch() == llvm::Triple::ppc ||
2638             TT.getArch() == llvm::Triple::ppc64 ||
2639             TT.getArch() == llvm::Triple::ppc64le ||
2640             TT.getArch() == llvm::Triple::nvptx ||
2641             TT.getArch() == llvm::Triple::nvptx64 ||
2642             TT.getArch() == llvm::Triple::x86 ||
2643             TT.getArch() == llvm::Triple::x86_64))
2644         Diags.Report(diag::err_drv_invalid_omp_target) << A->getValue(i);
2645       else
2646         Opts.OMPTargetTriples.push_back(TT);
2647     }
2648   }
2649 
2650   // Get OpenMP host file path if any and report if a non existent file is
2651   // found
2652   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
2653     Opts.OMPHostIRFile = A->getValue();
2654     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2655       Diags.Report(diag::err_drv_omp_host_ir_file_not_found)
2656           << Opts.OMPHostIRFile;
2657   }
2658 
2659   // set CUDA mode for OpenMP target NVPTX if specified in options
2660   Opts.OpenMPCUDAMode = Opts.OpenMPIsDevice && T.isNVPTX() &&
2661                         Args.hasArg(options::OPT_fopenmp_cuda_mode);
2662 
2663   // Record whether the __DEPRECATED define was requested.
2664   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2665                                  OPT_fno_deprecated_macro,
2666                                  Opts.Deprecated);
2667 
2668   // FIXME: Eliminate this dependency.
2669   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2670        OptSize = getOptimizationLevelSize(Args);
2671   Opts.Optimize = Opt != 0;
2672   Opts.OptimizeSize = OptSize != 0;
2673 
2674   // This is the __NO_INLINE__ define, which just depends on things like the
2675   // optimization level and -fno-inline, not actually whether the backend has
2676   // inlining enabled.
2677   Opts.NoInlineDefine = !Opts.Optimize;
2678   if (Arg *InlineArg = Args.getLastArg(
2679           options::OPT_finline_functions, options::OPT_finline_hint_functions,
2680           options::OPT_fno_inline_functions, options::OPT_fno_inline))
2681     if (InlineArg->getOption().matches(options::OPT_fno_inline))
2682       Opts.NoInlineDefine = true;
2683 
2684   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2685       Args.hasArg(OPT_cl_fast_relaxed_math);
2686   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2687       Args.hasArg(OPT_cl_finite_math_only) ||
2688       Args.hasArg(OPT_cl_fast_relaxed_math);
2689   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2690                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2691                       Args.hasArg(OPT_cl_fast_relaxed_math);
2692 
2693   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
2694     StringRef Val = A->getValue();
2695     if (Val == "fast")
2696       Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
2697     else if (Val == "on")
2698       Opts.setDefaultFPContractMode(LangOptions::FPC_On);
2699     else if (Val == "off")
2700       Opts.setDefaultFPContractMode(LangOptions::FPC_Off);
2701     else
2702       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
2703   }
2704 
2705   Opts.RetainCommentsFromSystemHeaders =
2706       Args.hasArg(OPT_fretain_comments_from_system_headers);
2707 
2708   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2709   switch (SSP) {
2710   default:
2711     Diags.Report(diag::err_drv_invalid_value)
2712       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2713     break;
2714   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2715   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2716   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2717   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2718   }
2719 
2720   // Parse -fsanitize= arguments.
2721   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2722                       Diags, Opts.Sanitize);
2723   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2724   Opts.SanitizeAddressFieldPadding =
2725       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2726   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2727 
2728   // -fxray-instrument
2729   Opts.XRayInstrument =
2730       Args.hasFlag(OPT_fxray_instrument, OPT_fnoxray_instrument, false);
2731 
2732   // -fxray-always-emit-customevents
2733   Opts.XRayAlwaysEmitCustomEvents =
2734       Args.hasFlag(OPT_fxray_always_emit_customevents,
2735                    OPT_fnoxray_always_emit_customevents, false);
2736 
2737   // -fxray-always-emit-typedevents
2738   Opts.XRayAlwaysEmitTypedEvents =
2739       Args.hasFlag(OPT_fxray_always_emit_typedevents,
2740                    OPT_fnoxray_always_emit_customevents, false);
2741 
2742   // -fxray-{always,never}-instrument= filenames.
2743   Opts.XRayAlwaysInstrumentFiles =
2744       Args.getAllArgValues(OPT_fxray_always_instrument);
2745   Opts.XRayNeverInstrumentFiles =
2746       Args.getAllArgValues(OPT_fxray_never_instrument);
2747   Opts.XRayAttrListFiles = Args.getAllArgValues(OPT_fxray_attr_list);
2748 
2749   // -fforce-emit-vtables
2750   Opts.ForceEmitVTables = Args.hasArg(OPT_fforce_emit_vtables);
2751 
2752   // -fallow-editor-placeholders
2753   Opts.AllowEditorPlaceholders = Args.hasArg(OPT_fallow_editor_placeholders);
2754 
2755   if (Arg *A = Args.getLastArg(OPT_fclang_abi_compat_EQ)) {
2756     Opts.setClangABICompat(LangOptions::ClangABI::Latest);
2757 
2758     StringRef Ver = A->getValue();
2759     std::pair<StringRef, StringRef> VerParts = Ver.split('.');
2760     unsigned Major, Minor = 0;
2761 
2762     // Check the version number is valid: either 3.x (0 <= x <= 9) or
2763     // y or y.0 (4 <= y <= current version).
2764     if (!VerParts.first.startswith("0") &&
2765         !VerParts.first.getAsInteger(10, Major) &&
2766         3 <= Major && Major <= CLANG_VERSION_MAJOR &&
2767         (Major == 3 ? VerParts.second.size() == 1 &&
2768                       !VerParts.second.getAsInteger(10, Minor)
2769                     : VerParts.first.size() == Ver.size() ||
2770                       VerParts.second == "0")) {
2771       // Got a valid version number.
2772       if (Major == 3 && Minor <= 8)
2773         Opts.setClangABICompat(LangOptions::ClangABI::Ver3_8);
2774       else if (Major <= 4)
2775         Opts.setClangABICompat(LangOptions::ClangABI::Ver4);
2776       else if (Major <= 6)
2777         Opts.setClangABICompat(LangOptions::ClangABI::Ver6);
2778     } else if (Ver != "latest") {
2779       Diags.Report(diag::err_drv_invalid_value)
2780           << A->getAsString(Args) << A->getValue();
2781     }
2782   }
2783 
2784   Opts.CompleteMemberPointers = Args.hasArg(OPT_fcomplete_member_pointers);
2785   Opts.BuildingPCHWithObjectFile = Args.hasArg(OPT_building_pch_with_obj);
2786 }
2787 
2788 static bool isStrictlyPreprocessorAction(frontend::ActionKind Action) {
2789   switch (Action) {
2790   case frontend::ASTDeclList:
2791   case frontend::ASTDump:
2792   case frontend::ASTPrint:
2793   case frontend::ASTView:
2794   case frontend::EmitAssembly:
2795   case frontend::EmitBC:
2796   case frontend::EmitHTML:
2797   case frontend::EmitLLVM:
2798   case frontend::EmitLLVMOnly:
2799   case frontend::EmitCodeGenOnly:
2800   case frontend::EmitObj:
2801   case frontend::FixIt:
2802   case frontend::GenerateModule:
2803   case frontend::GenerateModuleInterface:
2804   case frontend::GeneratePCH:
2805   case frontend::GeneratePTH:
2806   case frontend::ParseSyntaxOnly:
2807   case frontend::ModuleFileInfo:
2808   case frontend::VerifyPCH:
2809   case frontend::PluginAction:
2810   case frontend::PrintDeclContext:
2811   case frontend::RewriteObjC:
2812   case frontend::RewriteTest:
2813   case frontend::RunAnalysis:
2814   case frontend::TemplightDump:
2815   case frontend::MigrateSource:
2816     return false;
2817 
2818   case frontend::DumpCompilerOptions:
2819   case frontend::DumpRawTokens:
2820   case frontend::DumpTokens:
2821   case frontend::InitOnly:
2822   case frontend::PrintPreamble:
2823   case frontend::PrintPreprocessedInput:
2824   case frontend::RewriteMacros:
2825   case frontend::RunPreprocessorOnly:
2826     return true;
2827   }
2828   llvm_unreachable("invalid frontend action");
2829 }
2830 
2831 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2832                                   DiagnosticsEngine &Diags,
2833                                   frontend::ActionKind Action) {
2834   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2835   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2836   Opts.PCHThroughHeader = Args.getLastArgValue(OPT_pch_through_header_EQ);
2837   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2838       Opts.TokenCache = A->getValue();
2839   else
2840     Opts.TokenCache = Opts.ImplicitPTHInclude;
2841   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2842   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2843   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2844   Opts.AllowPCHWithCompilerErrors = Args.hasArg(OPT_fallow_pch_with_errors);
2845 
2846   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2847   for (const auto *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2848     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2849 
2850   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2851     StringRef Value(A->getValue());
2852     size_t Comma = Value.find(',');
2853     unsigned Bytes = 0;
2854     unsigned EndOfLine = 0;
2855 
2856     if (Comma == StringRef::npos ||
2857         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2858         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2859       Diags.Report(diag::err_drv_preamble_format);
2860     else {
2861       Opts.PrecompiledPreambleBytes.first = Bytes;
2862       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2863     }
2864   }
2865 
2866   // Add the __CET__ macro if a CFProtection option is set.
2867   if (const Arg *A = Args.getLastArg(OPT_fcf_protection_EQ)) {
2868     StringRef Name = A->getValue();
2869     if (Name == "branch")
2870       Opts.addMacroDef("__CET__=1");
2871     else if (Name == "return")
2872       Opts.addMacroDef("__CET__=2");
2873     else if (Name == "full")
2874       Opts.addMacroDef("__CET__=3");
2875   }
2876 
2877   // Add macros from the command line.
2878   for (const auto *A : Args.filtered(OPT_D, OPT_U)) {
2879     if (A->getOption().matches(OPT_D))
2880       Opts.addMacroDef(A->getValue());
2881     else
2882       Opts.addMacroUndef(A->getValue());
2883   }
2884 
2885   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2886 
2887   // Add the ordered list of -includes.
2888   for (const auto *A : Args.filtered(OPT_include))
2889     Opts.Includes.emplace_back(A->getValue());
2890 
2891   for (const auto *A : Args.filtered(OPT_chain_include))
2892     Opts.ChainedIncludes.emplace_back(A->getValue());
2893 
2894   for (const auto *A : Args.filtered(OPT_remap_file)) {
2895     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2896 
2897     if (Split.second.empty()) {
2898       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2899       continue;
2900     }
2901 
2902     Opts.addRemappedFile(Split.first, Split.second);
2903   }
2904 
2905   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2906     StringRef Name = A->getValue();
2907     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2908       .Case("libc++", ARCXX_libcxx)
2909       .Case("libstdc++", ARCXX_libstdcxx)
2910       .Case("none", ARCXX_nolib)
2911       .Default(~0U);
2912     if (Library == ~0U)
2913       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2914     else
2915       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2916   }
2917 
2918   // Always avoid lexing editor placeholders when we're just running the
2919   // preprocessor as we never want to emit the
2920   // "editor placeholder in source file" error in PP only mode.
2921   if (isStrictlyPreprocessorAction(Action))
2922     Opts.LexEditorPlaceholders = false;
2923 }
2924 
2925 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2926                                         ArgList &Args,
2927                                         frontend::ActionKind Action) {
2928   if (isStrictlyPreprocessorAction(Action))
2929     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2930   else
2931     Opts.ShowCPP = 0;
2932 
2933   Opts.ShowComments = Args.hasArg(OPT_C);
2934   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2935   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2936   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2937   Opts.ShowIncludeDirectives = Args.hasArg(OPT_dI);
2938   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2939   Opts.RewriteImports = Args.hasArg(OPT_frewrite_imports);
2940   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2941 }
2942 
2943 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2944                             DiagnosticsEngine &Diags) {
2945   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2946   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2947     StringRef Value = A->getValue();
2948     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2949                                  .Case("default", llvm::EABI::Default)
2950                                  .Case("4", llvm::EABI::EABI4)
2951                                  .Case("5", llvm::EABI::EABI5)
2952                                  .Case("gnu", llvm::EABI::GNU)
2953                                  .Default(llvm::EABI::Unknown);
2954     if (EABIVersion == llvm::EABI::Unknown)
2955       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2956                                                 << Value;
2957     else
2958       Opts.EABIVersion = EABIVersion;
2959   }
2960   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2961   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2962   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2963   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2964   Opts.Triple = Args.getLastArgValue(OPT_triple);
2965   // Use the default target triple if unspecified.
2966   if (Opts.Triple.empty())
2967     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2968   Opts.Triple = llvm::Triple::normalize(Opts.Triple);
2969   Opts.OpenCLExtensionsAsWritten = Args.getAllArgValues(OPT_cl_ext_EQ);
2970   Opts.ForceEnableInt128 = Args.hasArg(OPT_fforce_enable_int128);
2971   Opts.NVPTXUseShortPointers = Args.hasFlag(
2972       options::OPT_fcuda_short_ptr, options::OPT_fno_cuda_short_ptr, false);
2973 }
2974 
2975 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2976                                         const char *const *ArgBegin,
2977                                         const char *const *ArgEnd,
2978                                         DiagnosticsEngine &Diags) {
2979   bool Success = true;
2980 
2981   // Parse the arguments.
2982   std::unique_ptr<OptTable> Opts = createDriverOptTable();
2983   const unsigned IncludedFlagsBitmask = options::CC1Option;
2984   unsigned MissingArgIndex, MissingArgCount;
2985   InputArgList Args =
2986       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2987                       MissingArgCount, IncludedFlagsBitmask);
2988   LangOptions &LangOpts = *Res.getLangOpts();
2989 
2990   // Check for missing argument error.
2991   if (MissingArgCount) {
2992     Diags.Report(diag::err_drv_missing_argument)
2993         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2994     Success = false;
2995   }
2996 
2997   // Issue errors on unknown arguments.
2998   for (const auto *A : Args.filtered(OPT_UNKNOWN)) {
2999     auto ArgString = A->getAsString(Args);
3000     std::string Nearest;
3001     if (Opts->findNearest(ArgString, Nearest, IncludedFlagsBitmask) > 1)
3002       Diags.Report(diag::err_drv_unknown_argument) << ArgString;
3003     else
3004       Diags.Report(diag::err_drv_unknown_argument_with_suggestion)
3005           << ArgString << Nearest;
3006     Success = false;
3007   }
3008 
3009   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
3010   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
3011   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
3012   Success &=
3013       ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
3014                           false /*DefaultDiagColor*/, false /*DefaultShowOpt*/);
3015   ParseCommentArgs(LangOpts.CommentOpts, Args);
3016   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
3017   // FIXME: We shouldn't have to pass the DashX option around here
3018   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
3019                                       LangOpts.IsHeaderFile);
3020   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
3021   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
3022                               Res.getTargetOpts(), Res.getFrontendOpts());
3023   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args,
3024                         Res.getFileSystemOpts().WorkingDir);
3025   if (DashX.getFormat() == InputKind::Precompiled ||
3026       DashX.getLanguage() == InputKind::LLVM_IR) {
3027     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
3028     // PassManager in BackendUtil.cpp. They need to be initializd no matter
3029     // what the input type is.
3030     if (Args.hasArg(OPT_fobjc_arc))
3031       LangOpts.ObjCAutoRefCount = 1;
3032     // PIClevel and PIELevel are needed during code generation and this should be
3033     // set regardless of the input type.
3034     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
3035     LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
3036     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
3037                         Diags, LangOpts.Sanitize);
3038   } else {
3039     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
3040     // FIXME: Should we really be calling this for an InputKind::Asm input?
3041     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
3042                   Res.getPreprocessorOpts(), Diags);
3043     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
3044       LangOpts.ObjCExceptions = 1;
3045   }
3046 
3047   LangOpts.FunctionAlignment =
3048       getLastArgIntValue(Args, OPT_function_alignment, 0, Diags);
3049 
3050   if (LangOpts.CUDA) {
3051     // During CUDA device-side compilation, the aux triple is the
3052     // triple used for host compilation.
3053     if (LangOpts.CUDAIsDevice)
3054       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
3055   }
3056 
3057   // Set the triple of the host for OpenMP device compile.
3058   if (LangOpts.OpenMPIsDevice)
3059     Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
3060 
3061   // FIXME: Override value name discarding when asan or msan is used because the
3062   // backend passes depend on the name of the alloca in order to print out
3063   // names.
3064   Res.getCodeGenOpts().DiscardValueNames &=
3065       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
3066       !LangOpts.Sanitize.has(SanitizerKind::Memory);
3067 
3068   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, Diags,
3069                         Res.getFrontendOpts().ProgramAction);
3070   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
3071                               Res.getFrontendOpts().ProgramAction);
3072 
3073   // Turn on -Wspir-compat for SPIR target.
3074   llvm::Triple T(Res.getTargetOpts().Triple);
3075   auto Arch = T.getArch();
3076   if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) {
3077     Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
3078   }
3079 
3080   // If sanitizer is enabled, disable OPT_ffine_grained_bitfield_accesses.
3081   if (Res.getCodeGenOpts().FineGrainedBitfieldAccesses &&
3082       !Res.getLangOpts()->Sanitize.empty()) {
3083     Res.getCodeGenOpts().FineGrainedBitfieldAccesses = false;
3084     Diags.Report(diag::warn_drv_fine_grained_bitfield_accesses_ignored);
3085   }
3086   return Success;
3087 }
3088 
3089 std::string CompilerInvocation::getModuleHash() const {
3090   // Note: For QoI reasons, the things we use as a hash here should all be
3091   // dumped via the -module-info flag.
3092   using llvm::hash_code;
3093   using llvm::hash_value;
3094   using llvm::hash_combine;
3095 
3096   // Start the signature with the compiler version.
3097   // FIXME: We'd rather use something more cryptographically sound than
3098   // CityHash, but this will do for now.
3099   hash_code code = hash_value(getClangFullRepositoryVersion());
3100 
3101   // Extend the signature with the language options
3102 #define LANGOPT(Name, Bits, Default, Description) \
3103    code = hash_combine(code, LangOpts->Name);
3104 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
3105   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
3106 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
3107 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
3108 #include "clang/Basic/LangOptions.def"
3109 
3110   for (StringRef Feature : LangOpts->ModuleFeatures)
3111     code = hash_combine(code, Feature);
3112 
3113   // Extend the signature with the target options.
3114   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
3115                       TargetOpts->ABI);
3116   for (const auto &FeatureAsWritten : TargetOpts->FeaturesAsWritten)
3117     code = hash_combine(code, FeatureAsWritten);
3118 
3119   // Extend the signature with preprocessor options.
3120   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
3121   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
3122   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
3123 
3124   for (const auto &I : getPreprocessorOpts().Macros) {
3125     // If we're supposed to ignore this macro for the purposes of modules,
3126     // don't put it into the hash.
3127     if (!hsOpts.ModulesIgnoreMacros.empty()) {
3128       // Check whether we're ignoring this macro.
3129       StringRef MacroDef = I.first;
3130       if (hsOpts.ModulesIgnoreMacros.count(
3131               llvm::CachedHashString(MacroDef.split('=').first)))
3132         continue;
3133     }
3134 
3135     code = hash_combine(code, I.first, I.second);
3136   }
3137 
3138   // Extend the signature with the sysroot and other header search options.
3139   code = hash_combine(code, hsOpts.Sysroot,
3140                       hsOpts.ModuleFormat,
3141                       hsOpts.UseDebugInfo,
3142                       hsOpts.UseBuiltinIncludes,
3143                       hsOpts.UseStandardSystemIncludes,
3144                       hsOpts.UseStandardCXXIncludes,
3145                       hsOpts.UseLibcxx,
3146                       hsOpts.ModulesValidateDiagnosticOptions);
3147   code = hash_combine(code, hsOpts.ResourceDir);
3148 
3149   // Extend the signature with the user build path.
3150   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
3151 
3152   // Extend the signature with the module file extensions.
3153   const FrontendOptions &frontendOpts = getFrontendOpts();
3154   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
3155     code = ext->hashExtension(code);
3156   }
3157 
3158   // Extend the signature with the enabled sanitizers, if at least one is
3159   // enabled. Sanitizers which cannot affect AST generation aren't hashed.
3160   SanitizerSet SanHash = LangOpts->Sanitize;
3161   SanHash.clear(getPPTransparentSanitizers());
3162   if (!SanHash.empty())
3163     code = hash_combine(code, SanHash.Mask);
3164 
3165   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
3166 }
3167 
3168 template<typename IntTy>
3169 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
3170                                     IntTy Default,
3171                                     DiagnosticsEngine *Diags) {
3172   IntTy Res = Default;
3173   if (Arg *A = Args.getLastArg(Id)) {
3174     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
3175       if (Diags)
3176         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
3177                                                        << A->getValue();
3178     }
3179   }
3180   return Res;
3181 }
3182 
3183 namespace clang {
3184 
3185 // Declared in clang/Frontend/Utils.h.
3186 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
3187                        DiagnosticsEngine *Diags) {
3188   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
3189 }
3190 
3191 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
3192                                uint64_t Default,
3193                                DiagnosticsEngine *Diags) {
3194   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
3195 }
3196 
3197 void BuryPointer(const void *Ptr) {
3198   // This function may be called only a small fixed amount of times per each
3199   // invocation, otherwise we do actually have a leak which we want to report.
3200   // If this function is called more than kGraveYardMaxSize times, the pointers
3201   // will not be properly buried and a leak detector will report a leak, which
3202   // is what we want in such case.
3203   static const size_t kGraveYardMaxSize = 16;
3204   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
3205   static std::atomic<unsigned> GraveYardSize;
3206   unsigned Idx = GraveYardSize++;
3207   if (Idx >= kGraveYardMaxSize)
3208     return;
3209   GraveYard[Idx] = Ptr;
3210 }
3211 
3212 IntrusiveRefCntPtr<vfs::FileSystem>
3213 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
3214                                 DiagnosticsEngine &Diags) {
3215   return createVFSFromCompilerInvocation(CI, Diags, vfs::getRealFileSystem());
3216 }
3217 
3218 IntrusiveRefCntPtr<vfs::FileSystem>
3219 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
3220                                 DiagnosticsEngine &Diags,
3221                                 IntrusiveRefCntPtr<vfs::FileSystem> BaseFS) {
3222   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
3223     return BaseFS;
3224 
3225   IntrusiveRefCntPtr<vfs::OverlayFileSystem> Overlay(
3226       new vfs::OverlayFileSystem(BaseFS));
3227   // earlier vfs files are on the bottom
3228   for (const auto &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
3229     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
3230         BaseFS->getBufferForFile(File);
3231     if (!Buffer) {
3232       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
3233       continue;
3234     }
3235 
3236     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
3237         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
3238     if (FS)
3239       Overlay->pushOverlay(FS);
3240     else
3241       Diags.Report(diag::err_invalid_vfs_overlay) << File;
3242   }
3243   return Overlay;
3244 }
3245 
3246 } // namespace clang
3247