xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision b52e23669cbd8637819d9ff7777d43cbc3bf8f31)
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/FileManager.h"
14 #include "clang/Basic/Version.h"
15 #include "clang/Config/config.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/Options.h"
18 #include "clang/Driver/Util.h"
19 #include "clang/Frontend/FrontendDiagnostic.h"
20 #include "clang/Frontend/LangStandard.h"
21 #include "clang/Frontend/Utils.h"
22 #include "clang/Lex/HeaderSearchOptions.h"
23 #include "clang/Lex/PreprocessorOptions.h"
24 #include "clang/Serialization/ASTReader.h"
25 #include "clang/Serialization/ModuleFileExtension.h"
26 #include "llvm/ADT/Hashing.h"
27 #include "llvm/ADT/STLExtras.h"
28 #include "llvm/ADT/SmallVector.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/ADT/StringSwitch.h"
31 #include "llvm/ADT/Triple.h"
32 #include "llvm/Linker/Linker.h"
33 #include "llvm/Option/Arg.h"
34 #include "llvm/Option/ArgList.h"
35 #include "llvm/Option/OptTable.h"
36 #include "llvm/Option/Option.h"
37 #include "llvm/ProfileData/InstrProfReader.h"
38 #include "llvm/Support/CodeGen.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/FileSystem.h"
41 #include "llvm/Support/Host.h"
42 #include "llvm/Support/Path.h"
43 #include "llvm/Support/Process.h"
44 #include "llvm/Target/TargetOptions.h"
45 #include "llvm/Support/ScopedPrinter.h"
46 #include <atomic>
47 #include <memory>
48 #include <sys/stat.h>
49 #include <system_error>
50 using namespace clang;
51 
52 //===----------------------------------------------------------------------===//
53 // Initialization.
54 //===----------------------------------------------------------------------===//
55 
56 CompilerInvocationBase::CompilerInvocationBase()
57   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
58     DiagnosticOpts(new DiagnosticOptions()),
59     HeaderSearchOpts(new HeaderSearchOptions()),
60     PreprocessorOpts(new PreprocessorOptions()) {}
61 
62 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
63     : LangOpts(new LangOptions(*X.getLangOpts())),
64       TargetOpts(new TargetOptions(X.getTargetOpts())),
65       DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
66       HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
67       PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
68 
69 CompilerInvocationBase::~CompilerInvocationBase() {}
70 
71 //===----------------------------------------------------------------------===//
72 // Deserialization (from args)
73 //===----------------------------------------------------------------------===//
74 
75 using namespace clang::driver;
76 using namespace clang::driver::options;
77 using namespace llvm::opt;
78 
79 //
80 
81 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
82                                      DiagnosticsEngine &Diags) {
83   unsigned DefaultOpt = 0;
84   if (IK.getLanguage() == InputKind::OpenCL && !Args.hasArg(OPT_cl_opt_disable))
85     DefaultOpt = 2;
86 
87   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
88     if (A->getOption().matches(options::OPT_O0))
89       return 0;
90 
91     if (A->getOption().matches(options::OPT_Ofast))
92       return 3;
93 
94     assert (A->getOption().matches(options::OPT_O));
95 
96     StringRef S(A->getValue());
97     if (S == "s" || S == "z" || S.empty())
98       return 2;
99 
100     if (S == "g")
101       return 1;
102 
103     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
104   }
105 
106   return DefaultOpt;
107 }
108 
109 static unsigned getOptimizationLevelSize(ArgList &Args) {
110   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
111     if (A->getOption().matches(options::OPT_O)) {
112       switch (A->getValue()[0]) {
113       default:
114         return 0;
115       case 's':
116         return 1;
117       case 'z':
118         return 2;
119       }
120     }
121   }
122   return 0;
123 }
124 
125 static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
126                               OptSpecifier GroupWithValue,
127                               std::vector<std::string> &Diagnostics) {
128   for (Arg *A : Args.filtered(Group)) {
129     if (A->getOption().getKind() == Option::FlagClass) {
130       // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
131       // its name (minus the "W" or "R" at the beginning) to the warning list.
132       Diagnostics.push_back(A->getOption().getName().drop_front(1));
133     } else if (A->getOption().matches(GroupWithValue)) {
134       // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
135       Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
136     } else {
137       // Otherwise, add its value (for OPT_W_Joined and similar).
138       for (const char *Arg : A->getValues())
139         Diagnostics.emplace_back(Arg);
140     }
141   }
142 }
143 
144 static void getAllNoBuiltinFuncValues(ArgList &Args,
145                                       std::vector<std::string> &Funcs) {
146   SmallVector<const char *, 8> Values;
147   for (const auto &Arg : Args) {
148     const Option &O = Arg->getOption();
149     if (O.matches(options::OPT_fno_builtin_)) {
150       const char *FuncName = Arg->getValue();
151       if (Builtin::Context::isBuiltinFunc(FuncName))
152         Values.push_back(FuncName);
153     }
154   }
155   Funcs.insert(Funcs.end(), Values.begin(), Values.end());
156 }
157 
158 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
159                               DiagnosticsEngine &Diags) {
160   using namespace options;
161   bool Success = true;
162   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
163     StringRef Name = A->getValue();
164     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
165 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
166       .Case(CMDFLAG, NAME##Model)
167 #include "clang/StaticAnalyzer/Core/Analyses.def"
168       .Default(NumStores);
169     if (Value == NumStores) {
170       Diags.Report(diag::err_drv_invalid_value)
171         << A->getAsString(Args) << Name;
172       Success = false;
173     } else {
174       Opts.AnalysisStoreOpt = Value;
175     }
176   }
177 
178   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
179     StringRef Name = A->getValue();
180     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
181 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
182       .Case(CMDFLAG, NAME##Model)
183 #include "clang/StaticAnalyzer/Core/Analyses.def"
184       .Default(NumConstraints);
185     if (Value == NumConstraints) {
186       Diags.Report(diag::err_drv_invalid_value)
187         << A->getAsString(Args) << Name;
188       Success = false;
189     } else {
190       Opts.AnalysisConstraintsOpt = Value;
191     }
192   }
193 
194   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
195     StringRef Name = A->getValue();
196     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
197 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
198       .Case(CMDFLAG, PD_##NAME)
199 #include "clang/StaticAnalyzer/Core/Analyses.def"
200       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
201     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
202       Diags.Report(diag::err_drv_invalid_value)
203         << A->getAsString(Args) << Name;
204       Success = false;
205     } else {
206       Opts.AnalysisDiagOpt = Value;
207     }
208   }
209 
210   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
211     StringRef Name = A->getValue();
212     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
213 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
214       .Case(CMDFLAG, NAME)
215 #include "clang/StaticAnalyzer/Core/Analyses.def"
216       .Default(NumPurgeModes);
217     if (Value == NumPurgeModes) {
218       Diags.Report(diag::err_drv_invalid_value)
219         << A->getAsString(Args) << Name;
220       Success = false;
221     } else {
222       Opts.AnalysisPurgeOpt = Value;
223     }
224   }
225 
226   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
227     StringRef Name = A->getValue();
228     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
229 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
230       .Case(CMDFLAG, NAME)
231 #include "clang/StaticAnalyzer/Core/Analyses.def"
232       .Default(NumInliningModes);
233     if (Value == NumInliningModes) {
234       Diags.Report(diag::err_drv_invalid_value)
235         << A->getAsString(Args) << Name;
236       Success = false;
237     } else {
238       Opts.InliningMode = Value;
239     }
240   }
241 
242   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
243   Opts.ShowEnabledCheckerList = Args.hasArg(OPT_analyzer_list_enabled_checkers);
244   Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
245 
246   Opts.visualizeExplodedGraphWithGraphViz =
247     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
248   Opts.visualizeExplodedGraphWithUbiGraph =
249     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
250   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
251   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
252   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
253   Opts.AnalyzeNestedBlocks =
254     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
255   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
256   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
257   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
258   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
259   Opts.maxBlockVisitOnPath =
260       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
261   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
262   Opts.InlineMaxStackDepth =
263       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
264                          Opts.InlineMaxStackDepth, Diags);
265 
266   Opts.CheckersControlList.clear();
267   for (const Arg *A :
268        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
269     A->claim();
270     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
271     // We can have a list of comma separated checker names, e.g:
272     // '-analyzer-checker=cocoa,unix'
273     StringRef checkerList = A->getValue();
274     SmallVector<StringRef, 4> checkers;
275     checkerList.split(checkers, ",");
276     for (StringRef checker : checkers)
277       Opts.CheckersControlList.emplace_back(checker, enable);
278   }
279 
280   // Go through the analyzer configuration options.
281   for (const Arg *A : Args.filtered(OPT_analyzer_config)) {
282     A->claim();
283     // We can have a list of comma separated config names, e.g:
284     // '-analyzer-config key1=val1,key2=val2'
285     StringRef configList = A->getValue();
286     SmallVector<StringRef, 4> configVals;
287     configList.split(configVals, ",");
288     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
289       StringRef key, val;
290       std::tie(key, val) = configVals[i].split("=");
291       if (val.empty()) {
292         Diags.Report(SourceLocation(),
293                      diag::err_analyzer_config_no_value) << configVals[i];
294         Success = false;
295         break;
296       }
297       if (val.find('=') != StringRef::npos) {
298         Diags.Report(SourceLocation(),
299                      diag::err_analyzer_config_multiple_values)
300           << configVals[i];
301         Success = false;
302         break;
303       }
304       Opts.Config[key] = val;
305     }
306   }
307 
308   return Success;
309 }
310 
311 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
312   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
313   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
314   return true;
315 }
316 
317 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
318   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
319   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
320 }
321 
322 static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
323   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
324     StringRef Value = A->getValue();
325     if (Value == "small" || Value == "kernel" || Value == "medium" ||
326         Value == "large")
327       return Value;
328     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
329   }
330   return "default";
331 }
332 
333 static StringRef getRelocModel(ArgList &Args, DiagnosticsEngine &Diags) {
334   if (Arg *A = Args.getLastArg(OPT_mrelocation_model)) {
335     StringRef Value = A->getValue();
336     if (Value == "static" || Value == "pic" || Value == "ropi" ||
337         Value == "rwpi" || Value == "ropi-rwpi" || Value == "dynamic-no-pic")
338       return Value;
339     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
340   }
341   return "pic";
342 }
343 
344 /// \brief Create a new Regex instance out of the string value in \p RpassArg.
345 /// It returns a pointer to the newly generated Regex instance.
346 static std::shared_ptr<llvm::Regex>
347 GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
348                                 Arg *RpassArg) {
349   StringRef Val = RpassArg->getValue();
350   std::string RegexError;
351   std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
352   if (!Pattern->isValid(RegexError)) {
353     Diags.Report(diag::err_drv_optimization_remark_pattern)
354         << RegexError << RpassArg->getAsString(Args);
355     Pattern.reset();
356   }
357   return Pattern;
358 }
359 
360 static bool parseDiagnosticLevelMask(StringRef FlagName,
361                                      const std::vector<std::string> &Levels,
362                                      DiagnosticsEngine *Diags,
363                                      DiagnosticLevelMask &M) {
364   bool Success = true;
365   for (const auto &Level : Levels) {
366     DiagnosticLevelMask const PM =
367       llvm::StringSwitch<DiagnosticLevelMask>(Level)
368         .Case("note",    DiagnosticLevelMask::Note)
369         .Case("remark",  DiagnosticLevelMask::Remark)
370         .Case("warning", DiagnosticLevelMask::Warning)
371         .Case("error",   DiagnosticLevelMask::Error)
372         .Default(DiagnosticLevelMask::None);
373     if (PM == DiagnosticLevelMask::None) {
374       Success = false;
375       if (Diags)
376         Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
377     }
378     M = M | PM;
379   }
380   return Success;
381 }
382 
383 static void parseSanitizerKinds(StringRef FlagName,
384                                 const std::vector<std::string> &Sanitizers,
385                                 DiagnosticsEngine &Diags, SanitizerSet &S) {
386   for (const auto &Sanitizer : Sanitizers) {
387     SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
388     if (K == 0)
389       Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
390     else
391       S.set(K, true);
392   }
393 }
394 
395 // Set the profile kind for fprofile-instrument.
396 static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
397                                DiagnosticsEngine &Diags) {
398   Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
399   if (A == nullptr)
400     return;
401   StringRef S = A->getValue();
402   unsigned I = llvm::StringSwitch<unsigned>(S)
403                    .Case("none", CodeGenOptions::ProfileNone)
404                    .Case("clang", CodeGenOptions::ProfileClangInstr)
405                    .Case("llvm", CodeGenOptions::ProfileIRInstr)
406                    .Default(~0U);
407   if (I == ~0U) {
408     Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
409                                                          << S;
410     return;
411   }
412   CodeGenOptions::ProfileInstrKind Instrumentor =
413       static_cast<CodeGenOptions::ProfileInstrKind>(I);
414   Opts.setProfileInstr(Instrumentor);
415 }
416 
417 // Set the profile kind using fprofile-instrument-use-path.
418 static void setPGOUseInstrumentor(CodeGenOptions &Opts,
419                                   const Twine &ProfileName) {
420   auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
421   // In error, return silently and let Clang PGOUse report the error message.
422   if (auto E = ReaderOrErr.takeError()) {
423     llvm::consumeError(std::move(E));
424     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
425     return;
426   }
427   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
428     std::move(ReaderOrErr.get());
429   if (PGOReader->isIRLevelProfile())
430     Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
431   else
432     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
433 }
434 
435 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
436                              DiagnosticsEngine &Diags,
437                              const TargetOptions &TargetOpts) {
438   using namespace options;
439   bool Success = true;
440   llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
441 
442   unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
443   // TODO: This could be done in Driver
444   unsigned MaxOptLevel = 3;
445   if (OptimizationLevel > MaxOptLevel) {
446     // If the optimization level is not supported, fall back on the default
447     // optimization
448     Diags.Report(diag::warn_drv_optimization_value)
449         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
450     OptimizationLevel = MaxOptLevel;
451   }
452   Opts.OptimizationLevel = OptimizationLevel;
453 
454   // At O0 we want to fully disable inlining outside of cases marked with
455   // 'alwaysinline' that are required for correctness.
456   Opts.setInlining((Opts.OptimizationLevel == 0)
457                        ? CodeGenOptions::OnlyAlwaysInlining
458                        : CodeGenOptions::NormalInlining);
459   // Explicit inlining flags can disable some or all inlining even at
460   // optimization levels above zero.
461   if (Arg *InlineArg = Args.getLastArg(
462           options::OPT_finline_functions, options::OPT_finline_hint_functions,
463           options::OPT_fno_inline_functions, options::OPT_fno_inline)) {
464     if (Opts.OptimizationLevel > 0) {
465       const Option &InlineOpt = InlineArg->getOption();
466       if (InlineOpt.matches(options::OPT_finline_functions))
467         Opts.setInlining(CodeGenOptions::NormalInlining);
468       else if (InlineOpt.matches(options::OPT_finline_hint_functions))
469         Opts.setInlining(CodeGenOptions::OnlyHintInlining);
470       else
471         Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
472     }
473   }
474 
475   Opts.ExperimentalNewPassManager = Args.hasFlag(
476       OPT_fexperimental_new_pass_manager, OPT_fno_experimental_new_pass_manager,
477       /* Default */ false);
478 
479   Opts.DebugPassManager =
480       Args.hasFlag(OPT_fdebug_pass_manager, OPT_fno_debug_pass_manager,
481                    /* Default */ false);
482 
483   if (Arg *A = Args.getLastArg(OPT_fveclib)) {
484     StringRef Name = A->getValue();
485     if (Name == "Accelerate")
486       Opts.setVecLib(CodeGenOptions::Accelerate);
487     else if (Name == "SVML")
488       Opts.setVecLib(CodeGenOptions::SVML);
489     else if (Name == "none")
490       Opts.setVecLib(CodeGenOptions::NoLibrary);
491     else
492       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
493   }
494 
495   if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
496     unsigned Val =
497         llvm::StringSwitch<unsigned>(A->getValue())
498             .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
499             .Case("limited", codegenoptions::LimitedDebugInfo)
500             .Case("standalone", codegenoptions::FullDebugInfo)
501             .Default(~0U);
502     if (Val == ~0U)
503       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
504                                                 << A->getValue();
505     else
506       Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
507   }
508   if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
509     unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
510                        .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
511                        .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
512                        .Case("sce", unsigned(llvm::DebuggerKind::SCE))
513                        .Default(~0U);
514     if (Val == ~0U)
515       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
516                                                 << A->getValue();
517     else
518       Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
519   }
520   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
521   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
522   Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
523   Opts.MacroDebugInfo = Args.hasArg(OPT_debug_info_macro);
524   Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
525   Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
526   Opts.EnableSplitDwarf = Args.hasArg(OPT_enable_split_dwarf);
527   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
528   Opts.SplitDwarfInlining = !Args.hasArg(OPT_fno_split_dwarf_inlining);
529   Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
530   Opts.DebugExplicitImport = Triple.isPS4CPU();
531 
532   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
533     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
534 
535   if (const Arg *A =
536           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
537     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
538 
539   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
540   Opts.DisableLifetimeMarkers = Args.hasArg(OPT_disable_lifetimemarkers);
541   Opts.DisableO0ImplyOptNone = Args.hasArg(OPT_disable_O0_optnone);
542   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
543   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
544   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
545     OPT_fuse_register_sized_bitfield_access);
546   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
547   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
548   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
549   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
550   Opts.NoCommon = Args.hasArg(OPT_fno_common);
551   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
552   Opts.OptimizeSize = getOptimizationLevelSize(Args);
553   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
554                             Args.hasArg(OPT_ffreestanding));
555   if (Opts.SimplifyLibCalls)
556     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
557   Opts.UnrollLoops =
558       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
559                    (Opts.OptimizationLevel > 1));
560   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
561 
562   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
563   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
564   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
565   Opts.DebugInfoForProfiling = Args.hasFlag(
566       OPT_fdebug_info_for_profiling, OPT_fno_debug_info_for_profiling, false);
567   Opts.GnuPubnames = Args.hasArg(OPT_ggnu_pubnames);
568 
569   setPGOInstrumentor(Opts, Args, Diags);
570   Opts.InstrProfileOutput =
571       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
572   Opts.ProfileInstrumentUsePath =
573       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
574   if (!Opts.ProfileInstrumentUsePath.empty())
575     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
576 
577   if (Arg *A = Args.getLastArg(OPT_fclang_abi_compat_EQ)) {
578     Opts.setClangABICompat(CodeGenOptions::ClangABI::Latest);
579 
580     StringRef Ver = A->getValue();
581     std::pair<StringRef, StringRef> VerParts = Ver.split('.');
582     unsigned Major, Minor = 0;
583 
584     // Check the version number is valid: either 3.x (0 <= x <= 9) or
585     // y or y.0 (4 <= y <= current version).
586     if (!VerParts.first.startswith("0") &&
587         !VerParts.first.getAsInteger(10, Major) &&
588         3 <= Major && Major <= CLANG_VERSION_MAJOR &&
589         (Major == 3 ? VerParts.second.size() == 1 &&
590                       !VerParts.second.getAsInteger(10, Minor)
591                     : VerParts.first.size() == Ver.size() ||
592                       VerParts.second == "0")) {
593       // Got a valid version number.
594       if (Major == 3 && Minor <= 8)
595         Opts.setClangABICompat(CodeGenOptions::ClangABI::Ver3_8);
596       else if (Major <= 4)
597         Opts.setClangABICompat(CodeGenOptions::ClangABI::Ver4);
598     } else if (Ver != "latest") {
599       Diags.Report(diag::err_drv_invalid_value)
600           << A->getAsString(Args) << A->getValue();
601     }
602   }
603 
604   Opts.CoverageMapping =
605       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
606   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
607   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
608   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
609   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
610   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
611   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
612   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
613   Opts.CodeModel = getCodeModel(Args, Diags);
614   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
615   Opts.DisableFPElim =
616       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
617   Opts.DisableFree = Args.hasArg(OPT_disable_free);
618   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
619   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
620   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
621   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable) ||
622                           Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
623                           Args.hasArg(OPT_cl_fast_relaxed_math);
624   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
625   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
626                        Args.hasArg(OPT_cl_finite_math_only) ||
627                        Args.hasArg(OPT_cl_fast_relaxed_math));
628   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
629                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
630                        Args.hasArg(OPT_cl_finite_math_only) ||
631                        Args.hasArg(OPT_cl_fast_relaxed_math));
632   Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
633                         Args.hasArg(OPT_cl_no_signed_zeros) ||
634                         Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
635                         Args.hasArg(OPT_cl_fast_relaxed_math));
636   Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero);
637   Opts.CorrectlyRoundedDivSqrt =
638       Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
639   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
640   Opts.NoTrappingMath = Args.hasArg(OPT_fno_trapping_math);
641   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
642   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
643   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
644   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
645   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
646   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
647   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
648   Opts.IncrementalLinkerCompatible =
649       Args.hasArg(OPT_mincremental_linker_compatible);
650   Opts.PIECopyRelocations =
651       Args.hasArg(OPT_mpie_copy_relocations);
652   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
653   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
654   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
655   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
656   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
657   Opts.StrictReturn = !Args.hasArg(OPT_fno_strict_return);
658   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
659   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
660                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
661                       Args.hasArg(OPT_cl_fast_relaxed_math);
662   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
663   Opts.RelocationModel = getRelocModel(Args, Diags);
664   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
665   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
666     Diags.Report(diag::err_drv_invalid_value)
667         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
668         << Opts.ThreadModel;
669   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
670   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
671 
672   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
673                                        OPT_fno_function_sections, false);
674   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
675                                    OPT_fno_data_sections, false);
676   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
677                                          OPT_fno_unique_section_names, true);
678 
679   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
680 
681   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
682 
683   Opts.ProfileSampleAccurate = Args.hasArg(OPT_fprofile_sample_accurate);
684 
685   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
686   Opts.EmitSummaryIndex = false;
687   if (Arg *A = Args.getLastArg(OPT_flto_EQ)) {
688     StringRef S = A->getValue();
689     if (S == "thin")
690       Opts.EmitSummaryIndex = true;
691     else if (S != "full")
692       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
693   }
694   Opts.LTOUnit = Args.hasFlag(OPT_flto_unit, OPT_fno_lto_unit, false);
695   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
696     if (IK.getLanguage() != InputKind::LLVM_IR)
697       Diags.Report(diag::err_drv_argument_only_allowed_with)
698           << A->getAsString(Args) << "-x ir";
699     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
700   }
701   Opts.ThinLinkBitcodeFile = Args.getLastArgValue(OPT_fthin_link_bitcode_EQ);
702 
703   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
704 
705   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
706   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
707 
708   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
709   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
710 
711   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
712   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
713   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
714   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
715     Opts.CoverageDataFile = Args.getLastArgValue(OPT_coverage_data_file);
716     Opts.CoverageNotesFile = Args.getLastArgValue(OPT_coverage_notes_file);
717     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
718     Opts.CoverageNoFunctionNamesInData =
719         Args.hasArg(OPT_coverage_no_function_names_in_data);
720     Opts.CoverageExitBlockBeforeBody =
721         Args.hasArg(OPT_coverage_exit_block_before_body);
722     if (Args.hasArg(OPT_coverage_version_EQ)) {
723       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
724       if (CoverageVersion.size() != 4) {
725         Diags.Report(diag::err_drv_invalid_value)
726             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
727             << CoverageVersion;
728       } else {
729         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
730       }
731     }
732   }
733 	// Handle -fembed-bitcode option.
734   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
735     StringRef Name = A->getValue();
736     unsigned Model = llvm::StringSwitch<unsigned>(Name)
737         .Case("off", CodeGenOptions::Embed_Off)
738         .Case("all", CodeGenOptions::Embed_All)
739         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
740         .Case("marker", CodeGenOptions::Embed_Marker)
741         .Default(~0U);
742     if (Model == ~0U) {
743       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
744       Success = false;
745     } else
746       Opts.setEmbedBitcode(
747           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
748   }
749   // FIXME: For backend options that are not yet recorded as function
750   // attributes in the IR, keep track of them so we can embed them in a
751   // separate data section and use them when building the bitcode.
752   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
753     for (const auto &A : Args) {
754       // Do not encode output and input.
755       if (A->getOption().getID() == options::OPT_o ||
756           A->getOption().getID() == options::OPT_INPUT ||
757           A->getOption().getID() == options::OPT_x ||
758           A->getOption().getID() == options::OPT_fembed_bitcode ||
759           (A->getOption().getGroup().isValid() &&
760            A->getOption().getGroup().getID() == options::OPT_W_Group))
761         continue;
762       ArgStringList ASL;
763       A->render(Args, ASL);
764       for (const auto &arg : ASL) {
765         StringRef ArgStr(arg);
766         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
767         // using \00 to seperate each commandline options.
768         Opts.CmdArgs.push_back('\0');
769       }
770     }
771   }
772 
773   Opts.PreserveVec3Type = Args.hasArg(OPT_fpreserve_vec3_type);
774   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
775   Opts.XRayInstrumentFunctions = Args.hasArg(OPT_fxray_instrument);
776   Opts.XRayInstructionThreshold =
777       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_EQ, 200, Diags);
778   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
779   Opts.CallFEntry = Args.hasArg(OPT_mfentry);
780   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
781 
782   if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
783                                      OPT_compress_debug_sections_EQ)) {
784     if (A->getOption().getID() == OPT_compress_debug_sections) {
785       // TODO: be more clever about the compression type auto-detection
786       Opts.setCompressDebugSections(llvm::DebugCompressionType::GNU);
787     } else {
788       auto DCT = llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
789                      .Case("none", llvm::DebugCompressionType::None)
790                      .Case("zlib", llvm::DebugCompressionType::Z)
791                      .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
792                      .Default(llvm::DebugCompressionType::None);
793       Opts.setCompressDebugSections(DCT);
794     }
795   }
796 
797   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
798   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
799   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
800     CodeGenOptions::BitcodeFileToLink F;
801     F.Filename = A->getValue();
802     if (A->getOption().matches(OPT_mlink_cuda_bitcode)) {
803       F.LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded;
804       // When linking CUDA bitcode, propagate function attributes so that
805       // e.g. libdevice gets fast-math attrs if we're building with fast-math.
806       F.PropagateAttrs = true;
807       F.Internalize = true;
808     }
809     Opts.LinkBitcodeFiles.push_back(F);
810   }
811   Opts.SanitizeCoverageType =
812       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
813   Opts.SanitizeCoverageIndirectCalls =
814       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
815   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
816   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
817   Opts.SanitizeCoverageTraceDiv = Args.hasArg(OPT_fsanitize_coverage_trace_div);
818   Opts.SanitizeCoverageTraceGep = Args.hasArg(OPT_fsanitize_coverage_trace_gep);
819   Opts.SanitizeCoverage8bitCounters =
820       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
821   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
822   Opts.SanitizeCoverageTracePCGuard =
823       Args.hasArg(OPT_fsanitize_coverage_trace_pc_guard);
824   Opts.SanitizeCoverageNoPrune = Args.hasArg(OPT_fsanitize_coverage_no_prune);
825   Opts.SanitizeCoverageInline8bitCounters =
826       Args.hasArg(OPT_fsanitize_coverage_inline_8bit_counters);
827   Opts.SanitizeCoveragePCTable = Args.hasArg(OPT_fsanitize_coverage_pc_table);
828   Opts.SanitizeCoverageStackDepth =
829       Args.hasArg(OPT_fsanitize_coverage_stack_depth);
830   Opts.SanitizeMemoryTrackOrigins =
831       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
832   Opts.SanitizeMemoryUseAfterDtor =
833       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
834   Opts.SanitizeMinimalRuntime = Args.hasArg(OPT_fsanitize_minimal_runtime);
835   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
836   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
837   if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_after_scope,
838                                OPT_fno_sanitize_address_use_after_scope)) {
839     Opts.SanitizeAddressUseAfterScope =
840         A->getOption().getID() == OPT_fsanitize_address_use_after_scope;
841   }
842   Opts.SanitizeAddressGlobalsDeadStripping =
843       Args.hasArg(OPT_fsanitize_address_globals_dead_stripping);
844   Opts.SSPBufferSize =
845       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
846   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
847   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
848     StringRef Val = A->getValue();
849     unsigned StackAlignment = Opts.StackAlignment;
850     Val.getAsInteger(10, StackAlignment);
851     Opts.StackAlignment = StackAlignment;
852   }
853 
854   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
855     StringRef Val = A->getValue();
856     unsigned StackProbeSize = Opts.StackProbeSize;
857     Val.getAsInteger(0, StackProbeSize);
858     Opts.StackProbeSize = StackProbeSize;
859   }
860 
861   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
862     StringRef Name = A->getValue();
863     unsigned Method = llvm::StringSwitch<unsigned>(Name)
864       .Case("legacy", CodeGenOptions::Legacy)
865       .Case("non-legacy", CodeGenOptions::NonLegacy)
866       .Case("mixed", CodeGenOptions::Mixed)
867       .Default(~0U);
868     if (Method == ~0U) {
869       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
870       Success = false;
871     } else {
872       Opts.setObjCDispatchMethod(
873         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
874     }
875   }
876 
877   Opts.EmulatedTLS =
878       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
879 
880   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
881     StringRef Name = A->getValue();
882     unsigned Model = llvm::StringSwitch<unsigned>(Name)
883         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
884         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
885         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
886         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
887         .Default(~0U);
888     if (Model == ~0U) {
889       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
890       Success = false;
891     } else {
892       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
893     }
894   }
895 
896   if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
897     StringRef Val = A->getValue();
898     if (Val == "ieee")
899       Opts.FPDenormalMode = "ieee";
900     else if (Val == "preserve-sign")
901       Opts.FPDenormalMode = "preserve-sign";
902     else if (Val == "positive-zero")
903       Opts.FPDenormalMode = "positive-zero";
904     else
905       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
906   }
907 
908   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
909     if (A->getOption().matches(OPT_fpcc_struct_return)) {
910       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
911     } else {
912       assert(A->getOption().matches(OPT_freg_struct_return));
913       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
914     }
915   }
916 
917   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
918   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
919   bool NeedLocTracking = false;
920 
921   Opts.OptRecordFile = Args.getLastArgValue(OPT_opt_record_file);
922   if (!Opts.OptRecordFile.empty())
923     NeedLocTracking = true;
924 
925   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
926     Opts.OptimizationRemarkPattern =
927         GenerateOptimizationRemarkRegex(Diags, Args, A);
928     NeedLocTracking = true;
929   }
930 
931   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
932     Opts.OptimizationRemarkMissedPattern =
933         GenerateOptimizationRemarkRegex(Diags, Args, A);
934     NeedLocTracking = true;
935   }
936 
937   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
938     Opts.OptimizationRemarkAnalysisPattern =
939         GenerateOptimizationRemarkRegex(Diags, Args, A);
940     NeedLocTracking = true;
941   }
942 
943   Opts.DiagnosticsWithHotness =
944       Args.hasArg(options::OPT_fdiagnostics_show_hotness);
945   bool UsingSampleProfile = !Opts.SampleProfileFile.empty();
946   bool UsingProfile = UsingSampleProfile ||
947       (Opts.getProfileUse() != CodeGenOptions::ProfileNone);
948 
949   if (Opts.DiagnosticsWithHotness && !UsingProfile)
950     Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
951         << "-fdiagnostics-show-hotness";
952 
953   Opts.DiagnosticsHotnessThreshold = getLastArgUInt64Value(
954       Args, options::OPT_fdiagnostics_hotness_threshold_EQ, 0);
955   if (Opts.DiagnosticsHotnessThreshold > 0 && !UsingProfile)
956     Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
957         << "-fdiagnostics-hotness-threshold=";
958 
959   // If the user requested to use a sample profile for PGO, then the
960   // backend will need to track source location information so the profile
961   // can be incorporated into the IR.
962   if (UsingSampleProfile)
963     NeedLocTracking = true;
964 
965   // If the user requested a flag that requires source locations available in
966   // the backend, make sure that the backend tracks source location information.
967   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
968     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
969 
970   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
971 
972   // Parse -fsanitize-recover= arguments.
973   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
974   parseSanitizerKinds("-fsanitize-recover=",
975                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
976                       Opts.SanitizeRecover);
977   parseSanitizerKinds("-fsanitize-trap=",
978                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
979                       Opts.SanitizeTrap);
980 
981   Opts.CudaGpuBinaryFileNames =
982       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
983 
984   Opts.Backchain = Args.hasArg(OPT_mbackchain);
985 
986   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
987       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
988 
989   return Success;
990 }
991 
992 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
993                                       ArgList &Args) {
994   using namespace options;
995   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
996   Opts.Targets = Args.getAllArgValues(OPT_MT);
997   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
998   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
999   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
1000   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
1001   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
1002   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
1003   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
1004   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
1005   Opts.ModuleDependencyOutputDir =
1006       Args.getLastArgValue(OPT_module_dependency_dir);
1007   if (Args.hasArg(OPT_MV))
1008     Opts.OutputFormat = DependencyOutputFormat::NMake;
1009   // Add sanitizer blacklists as extra dependencies.
1010   // They won't be discovered by the regular preprocessor, so
1011   // we let make / ninja to know about this implicit dependency.
1012   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
1013   // Only the -fmodule-file=<file> form.
1014   for (const Arg *A : Args.filtered(OPT_fmodule_file)) {
1015     StringRef Val = A->getValue();
1016     if (Val.find('=') == StringRef::npos)
1017       Opts.ExtraDeps.push_back(Val);
1018   }
1019 }
1020 
1021 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
1022   // Color diagnostics default to auto ("on" if terminal supports) in the driver
1023   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
1024   // Support both clang's -f[no-]color-diagnostics and gcc's
1025   // -f[no-]diagnostics-colors[=never|always|auto].
1026   enum {
1027     Colors_On,
1028     Colors_Off,
1029     Colors_Auto
1030   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
1031   for (Arg *A : Args) {
1032     const Option &O = A->getOption();
1033     if (O.matches(options::OPT_fcolor_diagnostics) ||
1034         O.matches(options::OPT_fdiagnostics_color)) {
1035       ShowColors = Colors_On;
1036     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
1037                O.matches(options::OPT_fno_diagnostics_color)) {
1038       ShowColors = Colors_Off;
1039     } else if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
1040       StringRef Value(A->getValue());
1041       if (Value == "always")
1042         ShowColors = Colors_On;
1043       else if (Value == "never")
1044         ShowColors = Colors_Off;
1045       else if (Value == "auto")
1046         ShowColors = Colors_Auto;
1047     }
1048   }
1049   return ShowColors == Colors_On ||
1050          (ShowColors == Colors_Auto &&
1051           llvm::sys::Process::StandardErrHasColors());
1052 }
1053 
1054 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
1055                                 DiagnosticsEngine *Diags,
1056                                 bool DefaultDiagColor, bool DefaultShowOpt) {
1057   using namespace options;
1058   bool Success = true;
1059 
1060   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
1061   if (Arg *A =
1062           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
1063     Opts.DiagnosticSerializationFile = A->getValue();
1064   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
1065   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
1066   Opts.Pedantic = Args.hasArg(OPT_pedantic);
1067   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
1068   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
1069   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
1070   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
1071                                  OPT_fno_show_column,
1072                                  /*Default=*/true);
1073   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
1074   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
1075   Opts.AbsolutePath = Args.hasArg(OPT_fdiagnostics_absolute_paths);
1076   Opts.ShowOptionNames =
1077       Args.hasFlag(OPT_fdiagnostics_show_option,
1078                    OPT_fno_diagnostics_show_option, DefaultShowOpt);
1079 
1080   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
1081 
1082   // Default behavior is to not to show note include stacks.
1083   Opts.ShowNoteIncludeStack = false;
1084   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
1085                                OPT_fno_diagnostics_show_note_include_stack))
1086     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
1087       Opts.ShowNoteIncludeStack = true;
1088 
1089   StringRef ShowOverloads =
1090     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
1091   if (ShowOverloads == "best")
1092     Opts.setShowOverloads(Ovl_Best);
1093   else if (ShowOverloads == "all")
1094     Opts.setShowOverloads(Ovl_All);
1095   else {
1096     Success = false;
1097     if (Diags)
1098       Diags->Report(diag::err_drv_invalid_value)
1099       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
1100       << ShowOverloads;
1101   }
1102 
1103   StringRef ShowCategory =
1104     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
1105   if (ShowCategory == "none")
1106     Opts.ShowCategories = 0;
1107   else if (ShowCategory == "id")
1108     Opts.ShowCategories = 1;
1109   else if (ShowCategory == "name")
1110     Opts.ShowCategories = 2;
1111   else {
1112     Success = false;
1113     if (Diags)
1114       Diags->Report(diag::err_drv_invalid_value)
1115       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
1116       << ShowCategory;
1117   }
1118 
1119   StringRef Format =
1120     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
1121   if (Format == "clang")
1122     Opts.setFormat(DiagnosticOptions::Clang);
1123   else if (Format == "msvc")
1124     Opts.setFormat(DiagnosticOptions::MSVC);
1125   else if (Format == "msvc-fallback") {
1126     Opts.setFormat(DiagnosticOptions::MSVC);
1127     Opts.CLFallbackMode = true;
1128   } else if (Format == "vi")
1129     Opts.setFormat(DiagnosticOptions::Vi);
1130   else {
1131     Success = false;
1132     if (Diags)
1133       Diags->Report(diag::err_drv_invalid_value)
1134       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
1135       << Format;
1136   }
1137 
1138   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
1139   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
1140   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
1141   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
1142   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
1143   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
1144     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
1145     Diags, DiagMask);
1146   if (Args.hasArg(OPT_verify_ignore_unexpected))
1147     DiagMask = DiagnosticLevelMask::All;
1148   Opts.setVerifyIgnoreUnexpected(DiagMask);
1149   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1150   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1151   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1152   Opts.MacroBacktraceLimit =
1153       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1154                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1155   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1156       Args, OPT_ftemplate_backtrace_limit,
1157       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1158   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1159       Args, OPT_fconstexpr_backtrace_limit,
1160       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1161   Opts.SpellCheckingLimit = getLastArgIntValue(
1162       Args, OPT_fspell_checking_limit,
1163       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1164   Opts.SnippetLineLimit = getLastArgIntValue(
1165       Args, OPT_fcaret_diagnostics_max_lines,
1166       DiagnosticOptions::DefaultSnippetLineLimit, Diags);
1167   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1168                                     DiagnosticOptions::DefaultTabStop, Diags);
1169   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1170     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1171     if (Diags)
1172       Diags->Report(diag::warn_ignoring_ftabstop_value)
1173       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1174   }
1175   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1176   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1177   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1178 
1179   return Success;
1180 }
1181 
1182 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1183   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1184 }
1185 
1186 /// Parse the argument to the -ftest-module-file-extension
1187 /// command-line argument.
1188 ///
1189 /// \returns true on error, false on success.
1190 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1191                                             std::string &BlockName,
1192                                             unsigned &MajorVersion,
1193                                             unsigned &MinorVersion,
1194                                             bool &Hashed,
1195                                             std::string &UserInfo) {
1196   SmallVector<StringRef, 5> Args;
1197   Arg.split(Args, ':', 5);
1198   if (Args.size() < 5)
1199     return true;
1200 
1201   BlockName = Args[0];
1202   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1203   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1204   if (Args[3].getAsInteger(2, Hashed)) return true;
1205   if (Args.size() > 4)
1206     UserInfo = Args[4];
1207   return false;
1208 }
1209 
1210 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1211                                    DiagnosticsEngine &Diags,
1212                                    bool &IsHeaderFile) {
1213   using namespace options;
1214   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1215   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1216     switch (A->getOption().getID()) {
1217     default:
1218       llvm_unreachable("Invalid option in group!");
1219     case OPT_ast_list:
1220       Opts.ProgramAction = frontend::ASTDeclList; break;
1221     case OPT_ast_dump:
1222     case OPT_ast_dump_all:
1223     case OPT_ast_dump_lookups:
1224       Opts.ProgramAction = frontend::ASTDump; break;
1225     case OPT_ast_print:
1226       Opts.ProgramAction = frontend::ASTPrint; break;
1227     case OPT_ast_view:
1228       Opts.ProgramAction = frontend::ASTView; break;
1229     case OPT_dump_raw_tokens:
1230       Opts.ProgramAction = frontend::DumpRawTokens; break;
1231     case OPT_dump_tokens:
1232       Opts.ProgramAction = frontend::DumpTokens; break;
1233     case OPT_S:
1234       Opts.ProgramAction = frontend::EmitAssembly; break;
1235     case OPT_emit_llvm_bc:
1236       Opts.ProgramAction = frontend::EmitBC; break;
1237     case OPT_emit_html:
1238       Opts.ProgramAction = frontend::EmitHTML; break;
1239     case OPT_emit_llvm:
1240       Opts.ProgramAction = frontend::EmitLLVM; break;
1241     case OPT_emit_llvm_only:
1242       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1243     case OPT_emit_codegen_only:
1244       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1245     case OPT_emit_obj:
1246       Opts.ProgramAction = frontend::EmitObj; break;
1247     case OPT_fixit_EQ:
1248       Opts.FixItSuffix = A->getValue();
1249       // fall-through!
1250     case OPT_fixit:
1251       Opts.ProgramAction = frontend::FixIt; break;
1252     case OPT_emit_module:
1253       Opts.ProgramAction = frontend::GenerateModule; break;
1254     case OPT_emit_module_interface:
1255       Opts.ProgramAction = frontend::GenerateModuleInterface; break;
1256     case OPT_emit_pch:
1257       Opts.ProgramAction = frontend::GeneratePCH; break;
1258     case OPT_emit_pth:
1259       Opts.ProgramAction = frontend::GeneratePTH; break;
1260     case OPT_init_only:
1261       Opts.ProgramAction = frontend::InitOnly; break;
1262     case OPT_fsyntax_only:
1263       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1264     case OPT_module_file_info:
1265       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1266     case OPT_verify_pch:
1267       Opts.ProgramAction = frontend::VerifyPCH; break;
1268     case OPT_print_decl_contexts:
1269       Opts.ProgramAction = frontend::PrintDeclContext; break;
1270     case OPT_print_preamble:
1271       Opts.ProgramAction = frontend::PrintPreamble; break;
1272     case OPT_E:
1273       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1274     case OPT_rewrite_macros:
1275       Opts.ProgramAction = frontend::RewriteMacros; break;
1276     case OPT_rewrite_objc:
1277       Opts.ProgramAction = frontend::RewriteObjC; break;
1278     case OPT_rewrite_test:
1279       Opts.ProgramAction = frontend::RewriteTest; break;
1280     case OPT_analyze:
1281       Opts.ProgramAction = frontend::RunAnalysis; break;
1282     case OPT_migrate:
1283       Opts.ProgramAction = frontend::MigrateSource; break;
1284     case OPT_Eonly:
1285       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1286     }
1287   }
1288 
1289   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1290     Opts.Plugins.emplace_back(A->getValue(0));
1291     Opts.ProgramAction = frontend::PluginAction;
1292     Opts.ActionName = A->getValue();
1293   }
1294   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1295   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1296     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1297 
1298   for (const std::string &Arg :
1299          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1300     std::string BlockName;
1301     unsigned MajorVersion;
1302     unsigned MinorVersion;
1303     bool Hashed;
1304     std::string UserInfo;
1305     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1306                                         MinorVersion, Hashed, UserInfo)) {
1307       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1308 
1309       continue;
1310     }
1311 
1312     // Add the testing module file extension.
1313     Opts.ModuleFileExtensions.push_back(
1314         std::make_shared<TestModuleFileExtension>(
1315             BlockName, MajorVersion, MinorVersion, Hashed, UserInfo));
1316   }
1317 
1318   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1319     Opts.CodeCompletionAt =
1320       ParsedSourceLocation::FromString(A->getValue());
1321     if (Opts.CodeCompletionAt.FileName.empty())
1322       Diags.Report(diag::err_drv_invalid_value)
1323         << A->getAsString(Args) << A->getValue();
1324   }
1325   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1326 
1327   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1328   Opts.Plugins = Args.getAllArgValues(OPT_load);
1329   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1330   Opts.ShowHelp = Args.hasArg(OPT_help);
1331   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1332   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1333   Opts.ShowVersion = Args.hasArg(OPT_version);
1334   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1335   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1336   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1337   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1338   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1339   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1340   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1341   Opts.ASTDumpAll = Args.hasArg(OPT_ast_dump_all);
1342   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1343   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1344   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1345   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1346   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1347   // Only the -fmodule-file=<file> form.
1348   for (const Arg *A : Args.filtered(OPT_fmodule_file)) {
1349     StringRef Val = A->getValue();
1350     if (Val.find('=') == StringRef::npos)
1351       Opts.ModuleFiles.push_back(Val);
1352   }
1353   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1354   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1355   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
1356 
1357   Opts.CodeCompleteOpts.IncludeMacros
1358     = Args.hasArg(OPT_code_completion_macros);
1359   Opts.CodeCompleteOpts.IncludeCodePatterns
1360     = Args.hasArg(OPT_code_completion_patterns);
1361   Opts.CodeCompleteOpts.IncludeGlobals
1362     = !Args.hasArg(OPT_no_code_completion_globals);
1363   Opts.CodeCompleteOpts.IncludeBriefComments
1364     = Args.hasArg(OPT_code_completion_brief_comments);
1365 
1366   Opts.OverrideRecordLayoutsFile
1367     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1368   Opts.AuxTriple =
1369       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1370   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1371   Opts.StatsFile = Args.getLastArgValue(OPT_stats_file);
1372 
1373   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1374                                      OPT_arcmt_modify,
1375                                      OPT_arcmt_migrate)) {
1376     switch (A->getOption().getID()) {
1377     default:
1378       llvm_unreachable("missed a case");
1379     case OPT_arcmt_check:
1380       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1381       break;
1382     case OPT_arcmt_modify:
1383       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1384       break;
1385     case OPT_arcmt_migrate:
1386       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1387       break;
1388     }
1389   }
1390   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1391   Opts.ARCMTMigrateReportOut
1392     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1393   Opts.ARCMTMigrateEmitARCErrors
1394     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1395 
1396   if (Args.hasArg(OPT_objcmt_migrate_literals))
1397     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1398   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1399     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1400   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1401     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1402   if (Args.hasArg(OPT_objcmt_migrate_property))
1403     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1404   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1405     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1406   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1407     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1408   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1409     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1410   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1411     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1412   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1413     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1414   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1415     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1416   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1417     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1418   if (Args.hasArg(OPT_objcmt_atomic_property))
1419     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1420   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1421     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1422   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1423     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1424   if (Args.hasArg(OPT_objcmt_migrate_all))
1425     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1426 
1427   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1428 
1429   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1430       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1431     Diags.Report(diag::err_drv_argument_not_allowed_with)
1432       << "ARC migration" << "ObjC migration";
1433   }
1434 
1435   InputKind DashX(InputKind::Unknown);
1436   if (const Arg *A = Args.getLastArg(OPT_x)) {
1437     StringRef XValue = A->getValue();
1438 
1439     // Parse suffixes: '<lang>(-header|[-module-map][-cpp-output])'.
1440     // FIXME: Supporting '<lang>-header-cpp-output' would be useful.
1441     bool Preprocessed = XValue.consume_back("-cpp-output");
1442     bool ModuleMap = XValue.consume_back("-module-map");
1443     IsHeaderFile =
1444         !Preprocessed && !ModuleMap && XValue.consume_back("-header");
1445 
1446     // Principal languages.
1447     DashX = llvm::StringSwitch<InputKind>(XValue)
1448                 .Case("c", InputKind::C)
1449                 .Case("cl", InputKind::OpenCL)
1450                 .Case("cuda", InputKind::CUDA)
1451                 .Case("c++", InputKind::CXX)
1452                 .Case("objective-c", InputKind::ObjC)
1453                 .Case("objective-c++", InputKind::ObjCXX)
1454                 .Case("renderscript", InputKind::RenderScript)
1455                 .Default(InputKind::Unknown);
1456 
1457     // "objc[++]-cpp-output" is an acceptable synonym for
1458     // "objective-c[++]-cpp-output".
1459     if (DashX.isUnknown() && Preprocessed && !IsHeaderFile && !ModuleMap)
1460       DashX = llvm::StringSwitch<InputKind>(XValue)
1461                   .Case("objc", InputKind::ObjC)
1462                   .Case("objc++", InputKind::ObjCXX)
1463                   .Default(InputKind::Unknown);
1464 
1465     // Some special cases cannot be combined with suffixes.
1466     if (DashX.isUnknown() && !Preprocessed && !ModuleMap && !IsHeaderFile)
1467       DashX = llvm::StringSwitch<InputKind>(XValue)
1468                   .Case("cpp-output", InputKind(InputKind::C).getPreprocessed())
1469                   .Case("assembler-with-cpp", InputKind::Asm)
1470                   .Cases("ast", "pcm",
1471                          InputKind(InputKind::Unknown, InputKind::Precompiled))
1472                   .Case("ir", InputKind::LLVM_IR)
1473                   .Default(InputKind::Unknown);
1474 
1475     if (DashX.isUnknown())
1476       Diags.Report(diag::err_drv_invalid_value)
1477         << A->getAsString(Args) << A->getValue();
1478 
1479     if (Preprocessed)
1480       DashX = DashX.getPreprocessed();
1481     if (ModuleMap)
1482       DashX = DashX.withFormat(InputKind::ModuleMap);
1483   }
1484 
1485   // '-' is the default input if none is given.
1486   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1487   Opts.Inputs.clear();
1488   if (Inputs.empty())
1489     Inputs.push_back("-");
1490   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1491     InputKind IK = DashX;
1492     if (IK.isUnknown()) {
1493       IK = FrontendOptions::getInputKindForExtension(
1494         StringRef(Inputs[i]).rsplit('.').second);
1495       // FIXME: Warn on this?
1496       if (IK.isUnknown())
1497         IK = InputKind::C;
1498       // FIXME: Remove this hack.
1499       if (i == 0)
1500         DashX = IK;
1501     }
1502 
1503     // The -emit-module action implicitly takes a module map.
1504     if (Opts.ProgramAction == frontend::GenerateModule &&
1505         IK.getFormat() == InputKind::Source)
1506       IK = IK.withFormat(InputKind::ModuleMap);
1507 
1508     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1509   }
1510 
1511   return DashX;
1512 }
1513 
1514 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1515                                                  void *MainAddr) {
1516   std::string ClangExecutable =
1517       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1518   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1519 
1520   // Compute the path to the resource directory.
1521   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1522   SmallString<128> P(Dir);
1523   if (ClangResourceDir != "")
1524     llvm::sys::path::append(P, ClangResourceDir);
1525   else
1526     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1527                             "clang", CLANG_VERSION_STRING);
1528 
1529   return P.str();
1530 }
1531 
1532 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
1533                                   const std::string &WorkingDir) {
1534   using namespace options;
1535   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1536   Opts.Verbose = Args.hasArg(OPT_v);
1537   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1538   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1539   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1540   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1541     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1542   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1543 
1544   // Canonicalize -fmodules-cache-path before storing it.
1545   SmallString<128> P(Args.getLastArgValue(OPT_fmodules_cache_path));
1546   if (!(P.empty() || llvm::sys::path::is_absolute(P))) {
1547     if (WorkingDir.empty())
1548       llvm::sys::fs::make_absolute(P);
1549     else
1550       llvm::sys::fs::make_absolute(WorkingDir, P);
1551   }
1552   llvm::sys::path::remove_dots(P);
1553   Opts.ModuleCachePath = P.str();
1554 
1555   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1556   // Only the -fmodule-file=<name>=<file> form.
1557   for (const Arg *A : Args.filtered(OPT_fmodule_file)) {
1558     StringRef Val = A->getValue();
1559     if (Val.find('=') != StringRef::npos)
1560       Opts.PrebuiltModuleFiles.insert(Val.split('='));
1561   }
1562   for (const Arg *A : Args.filtered(OPT_fprebuilt_module_path))
1563     Opts.AddPrebuiltModulePath(A->getValue());
1564   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1565   Opts.ModulesHashContent = Args.hasArg(OPT_fmodules_hash_content);
1566   Opts.ModulesValidateDiagnosticOptions =
1567       !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
1568   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1569   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1570   Opts.ModuleCachePruneInterval =
1571       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1572   Opts.ModuleCachePruneAfter =
1573       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1574   Opts.ModulesValidateOncePerBuildSession =
1575       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1576   Opts.BuildSessionTimestamp =
1577       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1578   Opts.ModulesValidateSystemHeaders =
1579       Args.hasArg(OPT_fmodules_validate_system_headers);
1580   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1581     Opts.ModuleFormat = A->getValue();
1582 
1583   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1584     StringRef MacroDef = A->getValue();
1585     Opts.ModulesIgnoreMacros.insert(
1586         llvm::CachedHashString(MacroDef.split('=').first));
1587   }
1588 
1589   // Add -I..., -F..., and -index-header-map options in order.
1590   bool IsIndexHeaderMap = false;
1591   bool IsSysrootSpecified =
1592       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1593   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1594     if (A->getOption().matches(OPT_index_header_map)) {
1595       // -index-header-map applies to the next -I or -F.
1596       IsIndexHeaderMap = true;
1597       continue;
1598     }
1599 
1600     frontend::IncludeDirGroup Group =
1601         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1602 
1603     bool IsFramework = A->getOption().matches(OPT_F);
1604     std::string Path = A->getValue();
1605 
1606     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1607       SmallString<32> Buffer;
1608       llvm::sys::path::append(Buffer, Opts.Sysroot,
1609                               llvm::StringRef(A->getValue()).substr(1));
1610       Path = Buffer.str();
1611     }
1612 
1613     Opts.AddPath(Path, Group, IsFramework,
1614                  /*IgnoreSysroot*/ true);
1615     IsIndexHeaderMap = false;
1616   }
1617 
1618   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1619   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1620   for (const Arg *A :
1621        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1622     if (A->getOption().matches(OPT_iprefix))
1623       Prefix = A->getValue();
1624     else if (A->getOption().matches(OPT_iwithprefix))
1625       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1626     else
1627       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1628   }
1629 
1630   for (const Arg *A : Args.filtered(OPT_idirafter))
1631     Opts.AddPath(A->getValue(), frontend::After, false, true);
1632   for (const Arg *A : Args.filtered(OPT_iquote))
1633     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1634   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1635     Opts.AddPath(A->getValue(), frontend::System, false,
1636                  !A->getOption().matches(OPT_iwithsysroot));
1637   for (const Arg *A : Args.filtered(OPT_iframework))
1638     Opts.AddPath(A->getValue(), frontend::System, true, true);
1639   for (const Arg *A : Args.filtered(OPT_iframeworkwithsysroot))
1640     Opts.AddPath(A->getValue(), frontend::System, /*IsFramework=*/true,
1641                  /*IgnoreSysRoot=*/false);
1642 
1643   // Add the paths for the various language specific isystem flags.
1644   for (const Arg *A : Args.filtered(OPT_c_isystem))
1645     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1646   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1647     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1648   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1649     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1650   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1651     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1652 
1653   // Add the internal paths from a driver that detects standard include paths.
1654   for (const Arg *A :
1655        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1656     frontend::IncludeDirGroup Group = frontend::System;
1657     if (A->getOption().matches(OPT_internal_externc_isystem))
1658       Group = frontend::ExternCSystem;
1659     Opts.AddPath(A->getValue(), Group, false, true);
1660   }
1661 
1662   // Add the path prefixes which are implicitly treated as being system headers.
1663   for (const Arg *A :
1664        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1665     Opts.AddSystemHeaderPrefix(
1666         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1667 
1668   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1669     Opts.AddVFSOverlayFile(A->getValue());
1670 }
1671 
1672 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1673                                          const llvm::Triple &T,
1674                                          PreprocessorOptions &PPOpts,
1675                                          LangStandard::Kind LangStd) {
1676   // Set some properties which depend solely on the input kind; it would be nice
1677   // to move these to the language standard, and have the driver resolve the
1678   // input kind + language standard.
1679   //
1680   // FIXME: Perhaps a better model would be for a single source file to have
1681   // multiple language standards (C / C++ std, ObjC std, OpenCL std, OpenMP std)
1682   // simultaneously active?
1683   if (IK.getLanguage() == InputKind::Asm) {
1684     Opts.AsmPreprocessor = 1;
1685   } else if (IK.isObjectiveC()) {
1686     Opts.ObjC1 = Opts.ObjC2 = 1;
1687   }
1688 
1689   if (LangStd == LangStandard::lang_unspecified) {
1690     // Based on the base language, pick one.
1691     switch (IK.getLanguage()) {
1692     case InputKind::Unknown:
1693     case InputKind::LLVM_IR:
1694       llvm_unreachable("Invalid input kind!");
1695     case InputKind::OpenCL:
1696       LangStd = LangStandard::lang_opencl10;
1697       break;
1698     case InputKind::CUDA:
1699       LangStd = LangStandard::lang_cuda;
1700       break;
1701     case InputKind::Asm:
1702     case InputKind::C:
1703       // The PS4 uses C99 as the default C standard.
1704       if (T.isPS4())
1705         LangStd = LangStandard::lang_gnu99;
1706       else
1707         LangStd = LangStandard::lang_gnu11;
1708       break;
1709     case InputKind::ObjC:
1710       LangStd = LangStandard::lang_gnu11;
1711       break;
1712     case InputKind::CXX:
1713     case InputKind::ObjCXX:
1714       // The PS4 uses C++11 as the default C++ standard.
1715       if (T.isPS4())
1716         LangStd = LangStandard::lang_gnucxx11;
1717       else
1718         LangStd = LangStandard::lang_gnucxx98;
1719       break;
1720     case InputKind::RenderScript:
1721       LangStd = LangStandard::lang_c99;
1722       break;
1723     }
1724   }
1725 
1726   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1727   Opts.LineComment = Std.hasLineComments();
1728   Opts.C99 = Std.isC99();
1729   Opts.C11 = Std.isC11();
1730   Opts.CPlusPlus = Std.isCPlusPlus();
1731   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1732   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1733   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1734   Opts.CPlusPlus2a = Std.isCPlusPlus2a();
1735   Opts.Digraphs = Std.hasDigraphs();
1736   Opts.GNUMode = Std.isGNUMode();
1737   Opts.GNUInline = !Opts.C99 && !Opts.CPlusPlus;
1738   Opts.HexFloats = Std.hasHexFloats();
1739   Opts.ImplicitInt = Std.hasImplicitInt();
1740 
1741   // Set OpenCL Version.
1742   Opts.OpenCL = Std.isOpenCL();
1743   if (LangStd == LangStandard::lang_opencl10)
1744     Opts.OpenCLVersion = 100;
1745   else if (LangStd == LangStandard::lang_opencl11)
1746     Opts.OpenCLVersion = 110;
1747   else if (LangStd == LangStandard::lang_opencl12)
1748     Opts.OpenCLVersion = 120;
1749   else if (LangStd == LangStandard::lang_opencl20)
1750     Opts.OpenCLVersion = 200;
1751 
1752   // OpenCL has some additional defaults.
1753   if (Opts.OpenCL) {
1754     Opts.AltiVec = 0;
1755     Opts.ZVector = 0;
1756     Opts.LaxVectorConversions = 0;
1757     Opts.setDefaultFPContractMode(LangOptions::FPC_On);
1758     Opts.NativeHalfType = 1;
1759     Opts.NativeHalfArgsAndReturns = 1;
1760     // Include default header file for OpenCL.
1761     if (Opts.IncludeDefaultHeader) {
1762       PPOpts.Includes.push_back("opencl-c.h");
1763     }
1764   }
1765 
1766   Opts.CUDA = IK.getLanguage() == InputKind::CUDA;
1767   if (Opts.CUDA)
1768     // Set default FP_CONTRACT to FAST.
1769     Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
1770 
1771   Opts.RenderScript = IK.getLanguage() == InputKind::RenderScript;
1772   if (Opts.RenderScript) {
1773     Opts.NativeHalfType = 1;
1774     Opts.NativeHalfArgsAndReturns = 1;
1775   }
1776 
1777   // OpenCL and C++ both have bool, true, false keywords.
1778   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1779 
1780   // OpenCL has half keyword
1781   Opts.Half = Opts.OpenCL;
1782 
1783   // C++ has wchar_t keyword.
1784   Opts.WChar = Opts.CPlusPlus;
1785 
1786   Opts.GNUKeywords = Opts.GNUMode;
1787   Opts.CXXOperatorNames = Opts.CPlusPlus;
1788 
1789   Opts.AlignedAllocation = Opts.CPlusPlus1z;
1790 
1791   Opts.DollarIdents = !Opts.AsmPreprocessor;
1792 }
1793 
1794 /// Attempt to parse a visibility value out of the given argument.
1795 static Visibility parseVisibility(Arg *arg, ArgList &args,
1796                                   DiagnosticsEngine &diags) {
1797   StringRef value = arg->getValue();
1798   if (value == "default") {
1799     return DefaultVisibility;
1800   } else if (value == "hidden" || value == "internal") {
1801     return HiddenVisibility;
1802   } else if (value == "protected") {
1803     // FIXME: diagnose if target does not support protected visibility
1804     return ProtectedVisibility;
1805   }
1806 
1807   diags.Report(diag::err_drv_invalid_value)
1808     << arg->getAsString(args) << value;
1809   return DefaultVisibility;
1810 }
1811 
1812 /// Check if input file kind and language standard are compatible.
1813 static bool IsInputCompatibleWithStandard(InputKind IK,
1814                                           const LangStandard &S) {
1815   switch (IK.getLanguage()) {
1816   case InputKind::Unknown:
1817   case InputKind::LLVM_IR:
1818     llvm_unreachable("should not parse language flags for this input");
1819 
1820   case InputKind::C:
1821   case InputKind::ObjC:
1822   case InputKind::RenderScript:
1823     return S.getLanguage() == InputKind::C;
1824 
1825   case InputKind::OpenCL:
1826     return S.getLanguage() == InputKind::OpenCL;
1827 
1828   case InputKind::CXX:
1829   case InputKind::ObjCXX:
1830     return S.getLanguage() == InputKind::CXX;
1831 
1832   case InputKind::CUDA:
1833     // FIXME: What -std= values should be permitted for CUDA compilations?
1834     return S.getLanguage() == InputKind::CUDA ||
1835            S.getLanguage() == InputKind::CXX;
1836 
1837   case InputKind::Asm:
1838     // Accept (and ignore) all -std= values.
1839     // FIXME: The -std= value is not ignored; it affects the tokenization
1840     // and preprocessing rules if we're preprocessing this asm input.
1841     return true;
1842   }
1843 
1844   llvm_unreachable("unexpected input language");
1845 }
1846 
1847 /// Get language name for given input kind.
1848 static const StringRef GetInputKindName(InputKind IK) {
1849   switch (IK.getLanguage()) {
1850   case InputKind::C:
1851     return "C";
1852   case InputKind::ObjC:
1853     return "Objective-C";
1854   case InputKind::CXX:
1855     return "C++";
1856   case InputKind::ObjCXX:
1857     return "Objective-C++";
1858   case InputKind::OpenCL:
1859     return "OpenCL";
1860   case InputKind::CUDA:
1861     return "CUDA";
1862   case InputKind::RenderScript:
1863     return "RenderScript";
1864 
1865   case InputKind::Asm:
1866     return "Asm";
1867   case InputKind::LLVM_IR:
1868     return "LLVM IR";
1869 
1870   case InputKind::Unknown:
1871     break;
1872   }
1873   llvm_unreachable("unknown input language");
1874 }
1875 
1876 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1877                           const TargetOptions &TargetOpts,
1878                           PreprocessorOptions &PPOpts,
1879                           DiagnosticsEngine &Diags) {
1880   // FIXME: Cleanup per-file based stuff.
1881   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1882   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1883     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1884 #define LANGSTANDARD(id, name, lang, desc, features) \
1885       .Case(name, LangStandard::lang_##id)
1886 #define LANGSTANDARD_ALIAS(id, alias) \
1887       .Case(alias, LangStandard::lang_##id)
1888 #include "clang/Frontend/LangStandards.def"
1889       .Default(LangStandard::lang_unspecified);
1890     if (LangStd == LangStandard::lang_unspecified) {
1891       Diags.Report(diag::err_drv_invalid_value)
1892         << A->getAsString(Args) << A->getValue();
1893       // Report supported standards with short description.
1894       for (unsigned KindValue = 0;
1895            KindValue != LangStandard::lang_unspecified;
1896            ++KindValue) {
1897         const LangStandard &Std = LangStandard::getLangStandardForKind(
1898           static_cast<LangStandard::Kind>(KindValue));
1899         if (IsInputCompatibleWithStandard(IK, Std)) {
1900           auto Diag = Diags.Report(diag::note_drv_use_standard);
1901           Diag << Std.getName() << Std.getDescription();
1902           unsigned NumAliases = 0;
1903 #define LANGSTANDARD(id, name, lang, desc, features)
1904 #define LANGSTANDARD_ALIAS(id, alias) \
1905           if (KindValue == LangStandard::lang_##id) ++NumAliases;
1906 #define LANGSTANDARD_ALIAS_DEPR(id, alias)
1907 #include "clang/Frontend/LangStandards.def"
1908           Diag << NumAliases;
1909 #define LANGSTANDARD(id, name, lang, desc, features)
1910 #define LANGSTANDARD_ALIAS(id, alias) \
1911           if (KindValue == LangStandard::lang_##id) Diag << alias;
1912 #define LANGSTANDARD_ALIAS_DEPR(id, alias)
1913 #include "clang/Frontend/LangStandards.def"
1914         }
1915       }
1916     } else {
1917       // Valid standard, check to make sure language and standard are
1918       // compatible.
1919       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1920       if (!IsInputCompatibleWithStandard(IK, Std)) {
1921         Diags.Report(diag::err_drv_argument_not_allowed_with)
1922           << A->getAsString(Args) << GetInputKindName(IK);
1923       }
1924     }
1925   }
1926 
1927   // -cl-std only applies for OpenCL language standards.
1928   // Override the -std option in this case.
1929   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1930     LangStandard::Kind OpenCLLangStd
1931       = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1932         .Cases("cl", "CL", LangStandard::lang_opencl10)
1933         .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
1934         .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
1935         .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
1936         .Default(LangStandard::lang_unspecified);
1937 
1938     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1939       Diags.Report(diag::err_drv_invalid_value)
1940         << A->getAsString(Args) << A->getValue();
1941     }
1942     else
1943       LangStd = OpenCLLangStd;
1944   }
1945 
1946   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
1947 
1948   llvm::Triple T(TargetOpts.Triple);
1949   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
1950 
1951   // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
1952   // This option should be deprecated for CL > 1.0 because
1953   // this option was added for compatibility with OpenCL 1.0.
1954   if (Args.getLastArg(OPT_cl_strict_aliasing)
1955        && Opts.OpenCLVersion > 100) {
1956     std::string VerSpec = llvm::to_string(Opts.OpenCLVersion / 100) +
1957                           std::string(".") +
1958                           llvm::to_string((Opts.OpenCLVersion % 100) / 10);
1959     Diags.Report(diag::warn_option_invalid_ocl_version)
1960       << VerSpec << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
1961   }
1962 
1963   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1964   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1965   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1966   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1967   // name, as it doesn't seem a useful distinction.
1968   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1969                                   Opts.GNUKeywords);
1970 
1971   if (Args.hasArg(OPT_fno_operator_names))
1972     Opts.CXXOperatorNames = 0;
1973 
1974   if (Args.hasArg(OPT_fcuda_is_device))
1975     Opts.CUDAIsDevice = 1;
1976 
1977   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1978     Opts.CUDAAllowVariadicFunctions = 1;
1979 
1980   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1981     Opts.CUDAHostDeviceConstexpr = 0;
1982 
1983   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1984     Opts.CUDADeviceFlushDenormalsToZero = 1;
1985 
1986   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1987     Opts.CUDADeviceApproxTranscendentals = 1;
1988 
1989   if (Opts.ObjC1) {
1990     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1991       StringRef value = arg->getValue();
1992       if (Opts.ObjCRuntime.tryParse(value))
1993         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1994     }
1995 
1996     if (Args.hasArg(OPT_fobjc_gc_only))
1997       Opts.setGC(LangOptions::GCOnly);
1998     else if (Args.hasArg(OPT_fobjc_gc))
1999       Opts.setGC(LangOptions::HybridGC);
2000     else if (Args.hasArg(OPT_fobjc_arc)) {
2001       Opts.ObjCAutoRefCount = 1;
2002       if (!Opts.ObjCRuntime.allowsARC())
2003         Diags.Report(diag::err_arc_unsupported_on_runtime);
2004     }
2005 
2006     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
2007     // whether the feature is actually enabled.  This is predominantly
2008     // determined by -fobjc-runtime, but we allow it to be overridden
2009     // from the command line for testing purposes.
2010     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
2011       Opts.ObjCWeakRuntime = 1;
2012     else
2013       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
2014 
2015     // ObjCWeak determines whether __weak is actually enabled.
2016     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
2017     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
2018       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
2019         assert(!Opts.ObjCWeak);
2020       } else if (Opts.getGC() != LangOptions::NonGC) {
2021         Diags.Report(diag::err_objc_weak_with_gc);
2022       } else if (!Opts.ObjCWeakRuntime) {
2023         Diags.Report(diag::err_objc_weak_unsupported);
2024       } else {
2025         Opts.ObjCWeak = 1;
2026       }
2027     } else if (Opts.ObjCAutoRefCount) {
2028       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
2029     }
2030 
2031     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
2032       Opts.ObjCInferRelatedResultType = 0;
2033 
2034     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
2035       Opts.ObjCSubscriptingLegacyRuntime =
2036         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
2037   }
2038 
2039   if (Args.hasArg(OPT_fgnu89_inline)) {
2040     if (Opts.CPlusPlus)
2041       Diags.Report(diag::err_drv_argument_not_allowed_with)
2042         << "-fgnu89-inline" << GetInputKindName(IK);
2043     else
2044       Opts.GNUInline = 1;
2045   }
2046 
2047   if (Args.hasArg(OPT_fapple_kext)) {
2048     if (!Opts.CPlusPlus)
2049       Diags.Report(diag::warn_c_kext);
2050     else
2051       Opts.AppleKext = 1;
2052   }
2053 
2054   if (Args.hasArg(OPT_print_ivar_layout))
2055     Opts.ObjCGCBitmapPrint = 1;
2056   if (Args.hasArg(OPT_fno_constant_cfstrings))
2057     Opts.NoConstantCFStrings = 1;
2058 
2059   if (Args.hasArg(OPT_fzvector))
2060     Opts.ZVector = 1;
2061 
2062   if (Args.hasArg(OPT_pthread))
2063     Opts.POSIXThreads = 1;
2064 
2065   // The value-visibility mode defaults to "default".
2066   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
2067     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
2068   } else {
2069     Opts.setValueVisibilityMode(DefaultVisibility);
2070   }
2071 
2072   // The type-visibility mode defaults to the value-visibility mode.
2073   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
2074     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
2075   } else {
2076     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
2077   }
2078 
2079   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
2080     Opts.InlineVisibilityHidden = 1;
2081 
2082   if (Args.hasArg(OPT_ftrapv)) {
2083     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
2084     // Set the handler, if one is specified.
2085     Opts.OverflowHandler =
2086         Args.getLastArgValue(OPT_ftrapv_handler);
2087   }
2088   else if (Args.hasArg(OPT_fwrapv))
2089     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
2090 
2091   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
2092   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
2093   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
2094   Opts.MSCompatibilityVersion = 0;
2095   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
2096     VersionTuple VT;
2097     if (VT.tryParse(A->getValue()))
2098       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2099                                                 << A->getValue();
2100     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
2101                                   VT.getMinor().getValueOr(0) * 100000 +
2102                                   VT.getSubminor().getValueOr(0);
2103   }
2104 
2105   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
2106   // is specified, or -std is set to a conforming mode.
2107   // Trigraphs are disabled by default in c++1z onwards.
2108   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
2109   Opts.Trigraphs =
2110       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
2111 
2112   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
2113                                    OPT_fno_dollars_in_identifiers,
2114                                    Opts.DollarIdents);
2115   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
2116   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
2117   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
2118   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
2119   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
2120                                    Opts.ConstStrings);
2121   if (Args.hasArg(OPT_fno_lax_vector_conversions))
2122     Opts.LaxVectorConversions = 0;
2123   if (Args.hasArg(OPT_fno_threadsafe_statics))
2124     Opts.ThreadsafeStatics = 0;
2125   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
2126   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
2127   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
2128   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
2129   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
2130   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
2131 
2132   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
2133   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
2134   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
2135     && Opts.OpenCLVersion >= 200);
2136   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
2137   Opts.CoroutinesTS = Args.hasArg(OPT_fcoroutines_ts);
2138   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
2139   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
2140   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
2141   Opts.ModulesDeclUse =
2142       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
2143   Opts.ModulesLocalVisibility =
2144       Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS;
2145   Opts.ModulesCodegen = Args.hasArg(OPT_fmodules_codegen);
2146   Opts.ModulesDebugInfo = Args.hasArg(OPT_fmodules_debuginfo);
2147   Opts.ModulesSearchAll = Opts.Modules &&
2148     !Args.hasArg(OPT_fno_modules_search_all) &&
2149     Args.hasArg(OPT_fmodules_search_all);
2150   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
2151   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
2152   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
2153   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
2154   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
2155   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
2156   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
2157   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
2158   if (!Opts.NoBuiltin)
2159     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
2160   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
2161   Opts.RelaxedTemplateTemplateArgs =
2162       Args.hasArg(OPT_frelaxed_template_template_args);
2163   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
2164   Opts.AlignedAllocation =
2165       Args.hasFlag(OPT_faligned_allocation, OPT_fno_aligned_allocation,
2166                    Opts.AlignedAllocation);
2167   Opts.AlignedAllocationUnavailable =
2168       Opts.AlignedAllocation && Args.hasArg(OPT_aligned_alloc_unavailable);
2169   Opts.NewAlignOverride =
2170       getLastArgIntValue(Args, OPT_fnew_alignment_EQ, 0, Diags);
2171   if (Opts.NewAlignOverride && !llvm::isPowerOf2_32(Opts.NewAlignOverride)) {
2172     Arg *A = Args.getLastArg(OPT_fnew_alignment_EQ);
2173     Diags.Report(diag::err_fe_invalid_alignment) << A->getAsString(Args)
2174                                                  << A->getValue();
2175     Opts.NewAlignOverride = 0;
2176   }
2177   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
2178   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
2179   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
2180   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
2181   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
2182   Opts.InstantiationDepth =
2183       getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
2184   Opts.ArrowDepth =
2185       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
2186   Opts.ConstexprCallDepth =
2187       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
2188   Opts.ConstexprStepLimit =
2189       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
2190   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
2191   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
2192   Opts.NumLargeByValueCopy =
2193       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
2194   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
2195   Opts.ObjCConstantStringClass =
2196     Args.getLastArgValue(OPT_fconstant_string_class);
2197   Opts.ObjCDefaultSynthProperties =
2198     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
2199   Opts.EncodeExtendedBlockSig =
2200     Args.hasArg(OPT_fencode_extended_block_signature);
2201   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
2202   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
2203   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
2204   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
2205   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2206   Opts.PIE = Args.hasArg(OPT_pic_is_pie);
2207   Opts.Static = Args.hasArg(OPT_static_define);
2208   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
2209   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
2210                         || Args.hasArg(OPT_fdump_record_layouts);
2211   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
2212   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
2213   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
2214   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
2215   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
2216   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
2217   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
2218   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
2219   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
2220   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
2221   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
2222   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
2223   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
2224   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
2225   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
2226   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
2227   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
2228   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
2229   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
2230   // is enabled.
2231   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
2232                             | Opts.NativeHalfArgsAndReturns;
2233   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
2234 
2235   // __declspec is enabled by default for the PS4 by the driver, and also
2236   // enabled for Microsoft Extensions or Borland Extensions, here.
2237   //
2238   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
2239   // CUDA extension. However, it is required for supporting
2240   // __clang_cuda_builtin_vars.h, which uses __declspec(property). Once that has
2241   // been rewritten in terms of something more generic, remove the Opts.CUDA
2242   // term here.
2243   Opts.DeclSpecKeyword =
2244       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
2245                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
2246 
2247   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
2248     switch (llvm::StringSwitch<unsigned>(A->getValue())
2249       .Case("target", LangOptions::ASMM_Target)
2250       .Case("no", LangOptions::ASMM_Off)
2251       .Case("yes", LangOptions::ASMM_On)
2252       .Default(255)) {
2253     default:
2254       Diags.Report(diag::err_drv_invalid_value)
2255         << "-faddress-space-map-mangling=" << A->getValue();
2256       break;
2257     case LangOptions::ASMM_Target:
2258       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
2259       break;
2260     case LangOptions::ASMM_On:
2261       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
2262       break;
2263     case LangOptions::ASMM_Off:
2264       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
2265       break;
2266     }
2267   }
2268 
2269   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
2270     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
2271         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
2272             A->getValue())
2273             .Case("single",
2274                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
2275             .Case("multiple",
2276                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
2277             .Case("virtual",
2278                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
2279             .Default(LangOptions::PPTMK_BestCase);
2280     if (InheritanceModel == LangOptions::PPTMK_BestCase)
2281       Diags.Report(diag::err_drv_invalid_value)
2282           << "-fms-memptr-rep=" << A->getValue();
2283 
2284     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
2285   }
2286 
2287   // Check for MS default calling conventions being specified.
2288   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
2289     LangOptions::DefaultCallingConvention DefaultCC =
2290         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
2291             A->getValue())
2292             .Case("cdecl", LangOptions::DCC_CDecl)
2293             .Case("fastcall", LangOptions::DCC_FastCall)
2294             .Case("stdcall", LangOptions::DCC_StdCall)
2295             .Case("vectorcall", LangOptions::DCC_VectorCall)
2296             .Default(LangOptions::DCC_None);
2297     if (DefaultCC == LangOptions::DCC_None)
2298       Diags.Report(diag::err_drv_invalid_value)
2299           << "-fdefault-calling-conv=" << A->getValue();
2300 
2301     llvm::Triple T(TargetOpts.Triple);
2302     llvm::Triple::ArchType Arch = T.getArch();
2303     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2304                       DefaultCC == LangOptions::DCC_StdCall) &&
2305                      Arch != llvm::Triple::x86;
2306     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
2307                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2308     if (emitError)
2309       Diags.Report(diag::err_drv_argument_not_allowed_with)
2310           << A->getSpelling() << T.getTriple();
2311     else
2312       Opts.setDefaultCallingConv(DefaultCC);
2313   }
2314 
2315   // -mrtd option
2316   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2317     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2318       Diags.Report(diag::err_drv_argument_not_allowed_with)
2319           << A->getSpelling() << "-fdefault-calling-conv";
2320     else {
2321       llvm::Triple T(TargetOpts.Triple);
2322       if (T.getArch() != llvm::Triple::x86)
2323         Diags.Report(diag::err_drv_argument_not_allowed_with)
2324             << A->getSpelling() << T.getTriple();
2325       else
2326         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2327     }
2328   }
2329 
2330   // Check if -fopenmp is specified.
2331   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2332   Opts.OpenMPUseTLS =
2333       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2334   Opts.OpenMPIsDevice =
2335       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2336 
2337   if (Opts.OpenMP) {
2338     int Version =
2339         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2340     if (Version != 0)
2341       Opts.OpenMP = Version;
2342     // Provide diagnostic when a given target is not expected to be an OpenMP
2343     // device or host.
2344     if (!Opts.OpenMPIsDevice) {
2345       switch (T.getArch()) {
2346       default:
2347         break;
2348       // Add unsupported host targets here:
2349       case llvm::Triple::nvptx:
2350       case llvm::Triple::nvptx64:
2351         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2352             << TargetOpts.Triple;
2353         break;
2354       }
2355     }
2356   }
2357 
2358   // Set the flag to prevent the implementation from emitting device exception
2359   // handling code for those requiring so.
2360   if (Opts.OpenMPIsDevice && T.isNVPTX()) {
2361     Opts.Exceptions = 0;
2362     Opts.CXXExceptions = 0;
2363   }
2364 
2365   // Get the OpenMP target triples if any.
2366   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
2367 
2368     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2369       llvm::Triple TT(A->getValue(i));
2370 
2371       if (TT.getArch() == llvm::Triple::UnknownArch ||
2372           !(TT.getArch() == llvm::Triple::ppc ||
2373             TT.getArch() == llvm::Triple::ppc64 ||
2374             TT.getArch() == llvm::Triple::ppc64le ||
2375             TT.getArch() == llvm::Triple::nvptx ||
2376             TT.getArch() == llvm::Triple::nvptx64 ||
2377             TT.getArch() == llvm::Triple::x86 ||
2378             TT.getArch() == llvm::Triple::x86_64))
2379         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2380       else
2381         Opts.OMPTargetTriples.push_back(TT);
2382     }
2383   }
2384 
2385   // Get OpenMP host file path if any and report if a non existent file is
2386   // found
2387   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
2388     Opts.OMPHostIRFile = A->getValue();
2389     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2390       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2391           << Opts.OMPHostIRFile;
2392   }
2393 
2394   // Record whether the __DEPRECATED define was requested.
2395   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2396                                  OPT_fno_deprecated_macro,
2397                                  Opts.Deprecated);
2398 
2399   // FIXME: Eliminate this dependency.
2400   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2401        OptSize = getOptimizationLevelSize(Args);
2402   Opts.Optimize = Opt != 0;
2403   Opts.OptimizeSize = OptSize != 0;
2404 
2405   // This is the __NO_INLINE__ define, which just depends on things like the
2406   // optimization level and -fno-inline, not actually whether the backend has
2407   // inlining enabled.
2408   Opts.NoInlineDefine = !Opts.Optimize;
2409   if (Arg *InlineArg = Args.getLastArg(
2410           options::OPT_finline_functions, options::OPT_finline_hint_functions,
2411           options::OPT_fno_inline_functions, options::OPT_fno_inline))
2412     if (InlineArg->getOption().matches(options::OPT_fno_inline))
2413       Opts.NoInlineDefine = true;
2414 
2415   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2416       Args.hasArg(OPT_cl_fast_relaxed_math);
2417   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2418       Args.hasArg(OPT_cl_finite_math_only) ||
2419       Args.hasArg(OPT_cl_fast_relaxed_math);
2420   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2421                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2422                       Args.hasArg(OPT_cl_fast_relaxed_math);
2423 
2424   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
2425     StringRef Val = A->getValue();
2426     if (Val == "fast")
2427       Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
2428     else if (Val == "on")
2429       Opts.setDefaultFPContractMode(LangOptions::FPC_On);
2430     else if (Val == "off")
2431       Opts.setDefaultFPContractMode(LangOptions::FPC_Off);
2432     else
2433       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
2434   }
2435 
2436   Opts.RetainCommentsFromSystemHeaders =
2437       Args.hasArg(OPT_fretain_comments_from_system_headers);
2438 
2439   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2440   switch (SSP) {
2441   default:
2442     Diags.Report(diag::err_drv_invalid_value)
2443       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2444     break;
2445   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2446   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2447   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2448   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2449   }
2450 
2451   // Parse -fsanitize= arguments.
2452   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2453                       Diags, Opts.Sanitize);
2454   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2455   Opts.SanitizeAddressFieldPadding =
2456       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2457   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2458 
2459   // -fxray-instrument
2460   Opts.XRayInstrument =
2461       Args.hasFlag(OPT_fxray_instrument, OPT_fnoxray_instrument, false);
2462 
2463   // -fxray-{always,never}-instrument= filenames.
2464   Opts.XRayAlwaysInstrumentFiles =
2465       Args.getAllArgValues(OPT_fxray_always_instrument);
2466   Opts.XRayNeverInstrumentFiles =
2467       Args.getAllArgValues(OPT_fxray_never_instrument);
2468 
2469   // -fallow-editor-placeholders
2470   Opts.AllowEditorPlaceholders = Args.hasArg(OPT_fallow_editor_placeholders);
2471 }
2472 
2473 static bool isStrictlyPreprocessorAction(frontend::ActionKind Action) {
2474   switch (Action) {
2475   case frontend::ASTDeclList:
2476   case frontend::ASTDump:
2477   case frontend::ASTPrint:
2478   case frontend::ASTView:
2479   case frontend::EmitAssembly:
2480   case frontend::EmitBC:
2481   case frontend::EmitHTML:
2482   case frontend::EmitLLVM:
2483   case frontend::EmitLLVMOnly:
2484   case frontend::EmitCodeGenOnly:
2485   case frontend::EmitObj:
2486   case frontend::FixIt:
2487   case frontend::GenerateModule:
2488   case frontend::GenerateModuleInterface:
2489   case frontend::GeneratePCH:
2490   case frontend::GeneratePTH:
2491   case frontend::ParseSyntaxOnly:
2492   case frontend::ModuleFileInfo:
2493   case frontend::VerifyPCH:
2494   case frontend::PluginAction:
2495   case frontend::PrintDeclContext:
2496   case frontend::RewriteObjC:
2497   case frontend::RewriteTest:
2498   case frontend::RunAnalysis:
2499   case frontend::MigrateSource:
2500     return false;
2501 
2502   case frontend::DumpRawTokens:
2503   case frontend::DumpTokens:
2504   case frontend::InitOnly:
2505   case frontend::PrintPreamble:
2506   case frontend::PrintPreprocessedInput:
2507   case frontend::RewriteMacros:
2508   case frontend::RunPreprocessorOnly:
2509     return true;
2510   }
2511   llvm_unreachable("invalid frontend action");
2512 }
2513 
2514 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2515                                   FileManager &FileMgr,
2516                                   DiagnosticsEngine &Diags,
2517                                   frontend::ActionKind Action) {
2518   using namespace options;
2519   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2520   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2521   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2522       Opts.TokenCache = A->getValue();
2523   else
2524     Opts.TokenCache = Opts.ImplicitPTHInclude;
2525   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2526   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2527   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2528   Opts.AllowPCHWithCompilerErrors = Args.hasArg(OPT_fallow_pch_with_errors);
2529 
2530   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2531   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2532     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2533 
2534   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2535     StringRef Value(A->getValue());
2536     size_t Comma = Value.find(',');
2537     unsigned Bytes = 0;
2538     unsigned EndOfLine = 0;
2539 
2540     if (Comma == StringRef::npos ||
2541         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2542         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2543       Diags.Report(diag::err_drv_preamble_format);
2544     else {
2545       Opts.PrecompiledPreambleBytes.first = Bytes;
2546       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2547     }
2548   }
2549 
2550   // Add macros from the command line.
2551   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2552     if (A->getOption().matches(OPT_D))
2553       Opts.addMacroDef(A->getValue());
2554     else
2555       Opts.addMacroUndef(A->getValue());
2556   }
2557 
2558   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2559 
2560   // Add the ordered list of -includes.
2561   for (const Arg *A : Args.filtered(OPT_include))
2562     Opts.Includes.emplace_back(A->getValue());
2563 
2564   for (const Arg *A : Args.filtered(OPT_chain_include))
2565     Opts.ChainedIncludes.emplace_back(A->getValue());
2566 
2567   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2568     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2569 
2570     if (Split.second.empty()) {
2571       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2572       continue;
2573     }
2574 
2575     Opts.addRemappedFile(Split.first, Split.second);
2576   }
2577 
2578   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2579     StringRef Name = A->getValue();
2580     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2581       .Case("libc++", ARCXX_libcxx)
2582       .Case("libstdc++", ARCXX_libstdcxx)
2583       .Case("none", ARCXX_nolib)
2584       .Default(~0U);
2585     if (Library == ~0U)
2586       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2587     else
2588       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2589   }
2590 
2591   // Always avoid lexing editor placeholders when we're just running the
2592   // preprocessor as we never want to emit the
2593   // "editor placeholder in source file" error in PP only mode.
2594   if (isStrictlyPreprocessorAction(Action))
2595     Opts.LexEditorPlaceholders = false;
2596 }
2597 
2598 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2599                                         ArgList &Args,
2600                                         frontend::ActionKind Action) {
2601   using namespace options;
2602 
2603   if (isStrictlyPreprocessorAction(Action))
2604     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2605   else
2606     Opts.ShowCPP = 0;
2607 
2608   Opts.ShowComments = Args.hasArg(OPT_C);
2609   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2610   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2611   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2612   Opts.ShowIncludeDirectives = Args.hasArg(OPT_dI);
2613   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2614   Opts.RewriteImports = Args.hasArg(OPT_frewrite_imports);
2615   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2616 }
2617 
2618 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2619                             DiagnosticsEngine &Diags) {
2620   using namespace options;
2621   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2622   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2623     StringRef Value = A->getValue();
2624     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2625                                  .Case("default", llvm::EABI::Default)
2626                                  .Case("4", llvm::EABI::EABI4)
2627                                  .Case("5", llvm::EABI::EABI5)
2628                                  .Case("gnu", llvm::EABI::GNU)
2629                                  .Default(llvm::EABI::Unknown);
2630     if (EABIVersion == llvm::EABI::Unknown)
2631       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2632                                                 << Value;
2633     else
2634       Opts.EABIVersion = EABIVersion;
2635   }
2636   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2637   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2638   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2639   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2640   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2641   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2642   // Use the default target triple if unspecified.
2643   if (Opts.Triple.empty())
2644     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2645   Opts.OpenCLExtensionsAsWritten = Args.getAllArgValues(OPT_cl_ext_EQ);
2646 }
2647 
2648 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2649                                         const char *const *ArgBegin,
2650                                         const char *const *ArgEnd,
2651                                         DiagnosticsEngine &Diags) {
2652   bool Success = true;
2653 
2654   // Parse the arguments.
2655   std::unique_ptr<OptTable> Opts = createDriverOptTable();
2656   const unsigned IncludedFlagsBitmask = options::CC1Option;
2657   unsigned MissingArgIndex, MissingArgCount;
2658   InputArgList Args =
2659       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2660                       MissingArgCount, IncludedFlagsBitmask);
2661   LangOptions &LangOpts = *Res.getLangOpts();
2662 
2663   // Check for missing argument error.
2664   if (MissingArgCount) {
2665     Diags.Report(diag::err_drv_missing_argument)
2666         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2667     Success = false;
2668   }
2669 
2670   // Issue errors on unknown arguments.
2671   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2672     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2673     Success = false;
2674   }
2675 
2676   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2677   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2678   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2679   Success &=
2680       ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2681                           false /*DefaultDiagColor*/, false /*DefaultShowOpt*/);
2682   ParseCommentArgs(LangOpts.CommentOpts, Args);
2683   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2684   // FIXME: We shouldn't have to pass the DashX option around here
2685   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
2686                                       LangOpts.IsHeaderFile);
2687   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2688   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2689                               Res.getTargetOpts());
2690   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args,
2691                         Res.getFileSystemOpts().WorkingDir);
2692   if (DashX.getFormat() == InputKind::Precompiled ||
2693       DashX.getLanguage() == InputKind::LLVM_IR) {
2694     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2695     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2696     // what the input type is.
2697     if (Args.hasArg(OPT_fobjc_arc))
2698       LangOpts.ObjCAutoRefCount = 1;
2699     // PIClevel and PIELevel are needed during code generation and this should be
2700     // set regardless of the input type.
2701     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2702     LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
2703     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2704                         Diags, LangOpts.Sanitize);
2705   } else {
2706     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2707     // FIXME: Should we really be calling this for an InputKind::Asm input?
2708     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
2709                   Res.getPreprocessorOpts(), Diags);
2710     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2711       LangOpts.ObjCExceptions = 1;
2712   }
2713 
2714   if (LangOpts.CUDA) {
2715     // During CUDA device-side compilation, the aux triple is the
2716     // triple used for host compilation.
2717     if (LangOpts.CUDAIsDevice)
2718       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2719   }
2720 
2721   // Set the triple of the host for OpenMP device compile.
2722   if (LangOpts.OpenMPIsDevice)
2723     Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2724 
2725   // FIXME: Override value name discarding when asan or msan is used because the
2726   // backend passes depend on the name of the alloca in order to print out
2727   // names.
2728   Res.getCodeGenOpts().DiscardValueNames &=
2729       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2730       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2731 
2732   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2733   // PCH file and find the original header name. Remove the need to do that in
2734   // ParsePreprocessorArgs and remove the FileManager
2735   // parameters from the function and the "FileManager.h" #include.
2736   FileManager FileMgr(Res.getFileSystemOpts());
2737   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags,
2738                         Res.getFrontendOpts().ProgramAction);
2739   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2740                               Res.getFrontendOpts().ProgramAction);
2741 
2742   // Turn on -Wspir-compat for SPIR target.
2743   llvm::Triple T(Res.getTargetOpts().Triple);
2744   auto Arch = T.getArch();
2745   if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) {
2746     Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
2747   }
2748   return Success;
2749 }
2750 
2751 std::string CompilerInvocation::getModuleHash() const {
2752   // Note: For QoI reasons, the things we use as a hash here should all be
2753   // dumped via the -module-info flag.
2754   using llvm::hash_code;
2755   using llvm::hash_value;
2756   using llvm::hash_combine;
2757 
2758   // Start the signature with the compiler version.
2759   // FIXME: We'd rather use something more cryptographically sound than
2760   // CityHash, but this will do for now.
2761   hash_code code = hash_value(getClangFullRepositoryVersion());
2762 
2763   // Extend the signature with the language options
2764 #define LANGOPT(Name, Bits, Default, Description) \
2765    code = hash_combine(code, LangOpts->Name);
2766 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2767   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2768 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2769 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2770 #include "clang/Basic/LangOptions.def"
2771 
2772   for (StringRef Feature : LangOpts->ModuleFeatures)
2773     code = hash_combine(code, Feature);
2774 
2775   // Extend the signature with the target options.
2776   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2777                       TargetOpts->ABI);
2778   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2779     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2780 
2781   // Extend the signature with preprocessor options.
2782   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2783   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2784   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2785 
2786   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2787             I = getPreprocessorOpts().Macros.begin(),
2788          IEnd = getPreprocessorOpts().Macros.end();
2789        I != IEnd; ++I) {
2790     // If we're supposed to ignore this macro for the purposes of modules,
2791     // don't put it into the hash.
2792     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2793       // Check whether we're ignoring this macro.
2794       StringRef MacroDef = I->first;
2795       if (hsOpts.ModulesIgnoreMacros.count(
2796               llvm::CachedHashString(MacroDef.split('=').first)))
2797         continue;
2798     }
2799 
2800     code = hash_combine(code, I->first, I->second);
2801   }
2802 
2803   // Extend the signature with the sysroot and other header search options.
2804   code = hash_combine(code, hsOpts.Sysroot,
2805                       hsOpts.ModuleFormat,
2806                       hsOpts.UseDebugInfo,
2807                       hsOpts.UseBuiltinIncludes,
2808                       hsOpts.UseStandardSystemIncludes,
2809                       hsOpts.UseStandardCXXIncludes,
2810                       hsOpts.UseLibcxx,
2811                       hsOpts.ModulesValidateDiagnosticOptions);
2812   code = hash_combine(code, hsOpts.ResourceDir);
2813 
2814   // Extend the signature with the user build path.
2815   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2816 
2817   // Extend the signature with the module file extensions.
2818   const FrontendOptions &frontendOpts = getFrontendOpts();
2819   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2820     code = ext->hashExtension(code);
2821   }
2822 
2823   // Extend the signature with the enabled sanitizers, if at least one is
2824   // enabled. Sanitizers which cannot affect AST generation aren't hashed.
2825   SanitizerSet SanHash = LangOpts->Sanitize;
2826   SanHash.clear(getPPTransparentSanitizers());
2827   if (!SanHash.empty())
2828     code = hash_combine(code, SanHash.Mask);
2829 
2830   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2831 }
2832 
2833 namespace clang {
2834 
2835 template<typename IntTy>
2836 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2837                                     IntTy Default,
2838                                     DiagnosticsEngine *Diags) {
2839   IntTy Res = Default;
2840   if (Arg *A = Args.getLastArg(Id)) {
2841     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2842       if (Diags)
2843         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2844                                                        << A->getValue();
2845     }
2846   }
2847   return Res;
2848 }
2849 
2850 
2851 // Declared in clang/Frontend/Utils.h.
2852 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2853                        DiagnosticsEngine *Diags) {
2854   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2855 }
2856 
2857 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2858                                uint64_t Default,
2859                                DiagnosticsEngine *Diags) {
2860   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2861 }
2862 
2863 void BuryPointer(const void *Ptr) {
2864   // This function may be called only a small fixed amount of times per each
2865   // invocation, otherwise we do actually have a leak which we want to report.
2866   // If this function is called more than kGraveYardMaxSize times, the pointers
2867   // will not be properly buried and a leak detector will report a leak, which
2868   // is what we want in such case.
2869   static const size_t kGraveYardMaxSize = 16;
2870   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2871   static std::atomic<unsigned> GraveYardSize;
2872   unsigned Idx = GraveYardSize++;
2873   if (Idx >= kGraveYardMaxSize)
2874     return;
2875   GraveYard[Idx] = Ptr;
2876 }
2877 
2878 IntrusiveRefCntPtr<vfs::FileSystem>
2879 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2880                                 DiagnosticsEngine &Diags) {
2881   return createVFSFromCompilerInvocation(CI, Diags, vfs::getRealFileSystem());
2882 }
2883 
2884 IntrusiveRefCntPtr<vfs::FileSystem>
2885 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2886                                 DiagnosticsEngine &Diags,
2887                                 IntrusiveRefCntPtr<vfs::FileSystem> BaseFS) {
2888   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2889     return BaseFS;
2890 
2891   IntrusiveRefCntPtr<vfs::OverlayFileSystem> Overlay(
2892       new vfs::OverlayFileSystem(BaseFS));
2893   // earlier vfs files are on the bottom
2894   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2895     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2896         BaseFS->getBufferForFile(File);
2897     if (!Buffer) {
2898       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2899       return IntrusiveRefCntPtr<vfs::FileSystem>();
2900     }
2901 
2902     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2903         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2904     if (!FS.get()) {
2905       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2906       return IntrusiveRefCntPtr<vfs::FileSystem>();
2907     }
2908     Overlay->pushOverlay(FS);
2909   }
2910   return Overlay;
2911 }
2912 } // end namespace clang
2913