xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision daae9528b752363b158adf4708ab586bb3418894)
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 = Args.hasArg(OPT_dwarf_explicit_import);
531   Opts.DebugFwdTemplateParams = Args.hasArg(OPT_debug_forward_template_params);
532 
533   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
534     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
535 
536   if (const Arg *A =
537           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
538     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
539 
540   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
541   Opts.DisableLifetimeMarkers = Args.hasArg(OPT_disable_lifetimemarkers);
542   Opts.DisableO0ImplyOptNone = Args.hasArg(OPT_disable_O0_optnone);
543   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
544   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
545   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
546     OPT_fuse_register_sized_bitfield_access);
547   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
548   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
549   Opts.FineGrainedBitfieldAccesses =
550       Args.hasFlag(OPT_ffine_grained_bitfield_accesses,
551                    OPT_fno_fine_grained_bitfield_accesses, false);
552   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
553   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
554   Opts.NoCommon = Args.hasArg(OPT_fno_common);
555   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
556   Opts.OptimizeSize = getOptimizationLevelSize(Args);
557   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
558                             Args.hasArg(OPT_ffreestanding));
559   if (Opts.SimplifyLibCalls)
560     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
561   Opts.UnrollLoops =
562       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
563                    (Opts.OptimizationLevel > 1));
564   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
565 
566   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
567   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
568   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
569   Opts.DebugInfoForProfiling = Args.hasFlag(
570       OPT_fdebug_info_for_profiling, OPT_fno_debug_info_for_profiling, false);
571   Opts.GnuPubnames = Args.hasArg(OPT_ggnu_pubnames);
572 
573   setPGOInstrumentor(Opts, Args, Diags);
574   Opts.InstrProfileOutput =
575       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
576   Opts.ProfileInstrumentUsePath =
577       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
578   if (!Opts.ProfileInstrumentUsePath.empty())
579     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
580 
581   if (Arg *A = Args.getLastArg(OPT_fclang_abi_compat_EQ)) {
582     Opts.setClangABICompat(CodeGenOptions::ClangABI::Latest);
583 
584     StringRef Ver = A->getValue();
585     std::pair<StringRef, StringRef> VerParts = Ver.split('.');
586     unsigned Major, Minor = 0;
587 
588     // Check the version number is valid: either 3.x (0 <= x <= 9) or
589     // y or y.0 (4 <= y <= current version).
590     if (!VerParts.first.startswith("0") &&
591         !VerParts.first.getAsInteger(10, Major) &&
592         3 <= Major && Major <= CLANG_VERSION_MAJOR &&
593         (Major == 3 ? VerParts.second.size() == 1 &&
594                       !VerParts.second.getAsInteger(10, Minor)
595                     : VerParts.first.size() == Ver.size() ||
596                       VerParts.second == "0")) {
597       // Got a valid version number.
598       if (Major == 3 && Minor <= 8)
599         Opts.setClangABICompat(CodeGenOptions::ClangABI::Ver3_8);
600       else if (Major <= 4)
601         Opts.setClangABICompat(CodeGenOptions::ClangABI::Ver4);
602     } else if (Ver != "latest") {
603       Diags.Report(diag::err_drv_invalid_value)
604           << A->getAsString(Args) << A->getValue();
605     }
606   }
607 
608   Opts.CoverageMapping =
609       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
610   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
611   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
612   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
613   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
614   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
615   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
616   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
617   Opts.CodeModel = getCodeModel(Args, Diags);
618   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
619   Opts.DisableFPElim =
620       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
621   Opts.DisableFree = Args.hasArg(OPT_disable_free);
622   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
623   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
624   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
625   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable) ||
626                           Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
627                           Args.hasArg(OPT_cl_fast_relaxed_math);
628   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
629   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
630                        Args.hasArg(OPT_cl_finite_math_only) ||
631                        Args.hasArg(OPT_cl_fast_relaxed_math));
632   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
633                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
634                        Args.hasArg(OPT_cl_finite_math_only) ||
635                        Args.hasArg(OPT_cl_fast_relaxed_math));
636   Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
637                         Args.hasArg(OPT_cl_no_signed_zeros) ||
638                         Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
639                         Args.hasArg(OPT_cl_fast_relaxed_math));
640   Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero);
641   Opts.CorrectlyRoundedDivSqrt =
642       Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
643   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
644   Opts.NoTrappingMath = Args.hasArg(OPT_fno_trapping_math);
645   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
646   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
647   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
648   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
649   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
650   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
651   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
652   Opts.IncrementalLinkerCompatible =
653       Args.hasArg(OPT_mincremental_linker_compatible);
654   Opts.PIECopyRelocations =
655       Args.hasArg(OPT_mpie_copy_relocations);
656   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
657   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
658   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
659   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
660   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
661   Opts.StrictReturn = !Args.hasArg(OPT_fno_strict_return);
662   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
663   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
664                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
665                       Args.hasArg(OPT_cl_fast_relaxed_math);
666   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
667   Opts.RelocationModel = getRelocModel(Args, Diags);
668   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
669   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
670     Diags.Report(diag::err_drv_invalid_value)
671         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
672         << Opts.ThreadModel;
673   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
674   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
675 
676   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
677                                        OPT_fno_function_sections, false);
678   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
679                                    OPT_fno_data_sections, false);
680   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
681                                          OPT_fno_unique_section_names, true);
682 
683   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
684 
685   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
686 
687   Opts.ProfileSampleAccurate = Args.hasArg(OPT_fprofile_sample_accurate);
688 
689   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
690   Opts.EmitSummaryIndex = false;
691   if (Arg *A = Args.getLastArg(OPT_flto_EQ)) {
692     StringRef S = A->getValue();
693     if (S == "thin")
694       Opts.EmitSummaryIndex = true;
695     else if (S != "full")
696       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << S;
697   }
698   Opts.LTOUnit = Args.hasFlag(OPT_flto_unit, OPT_fno_lto_unit, false);
699   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
700     if (IK.getLanguage() != InputKind::LLVM_IR)
701       Diags.Report(diag::err_drv_argument_only_allowed_with)
702           << A->getAsString(Args) << "-x ir";
703     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
704   }
705   Opts.ThinLinkBitcodeFile = Args.getLastArgValue(OPT_fthin_link_bitcode_EQ);
706 
707   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
708 
709   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
710   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
711 
712   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
713   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
714 
715   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
716   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
717   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
718   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
719     Opts.CoverageDataFile = Args.getLastArgValue(OPT_coverage_data_file);
720     Opts.CoverageNotesFile = Args.getLastArgValue(OPT_coverage_notes_file);
721     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
722     Opts.CoverageNoFunctionNamesInData =
723         Args.hasArg(OPT_coverage_no_function_names_in_data);
724     Opts.CoverageExitBlockBeforeBody =
725         Args.hasArg(OPT_coverage_exit_block_before_body);
726     if (Args.hasArg(OPT_coverage_version_EQ)) {
727       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
728       if (CoverageVersion.size() != 4) {
729         Diags.Report(diag::err_drv_invalid_value)
730             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
731             << CoverageVersion;
732       } else {
733         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
734       }
735     }
736   }
737 	// Handle -fembed-bitcode option.
738   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
739     StringRef Name = A->getValue();
740     unsigned Model = llvm::StringSwitch<unsigned>(Name)
741         .Case("off", CodeGenOptions::Embed_Off)
742         .Case("all", CodeGenOptions::Embed_All)
743         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
744         .Case("marker", CodeGenOptions::Embed_Marker)
745         .Default(~0U);
746     if (Model == ~0U) {
747       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
748       Success = false;
749     } else
750       Opts.setEmbedBitcode(
751           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
752   }
753   // FIXME: For backend options that are not yet recorded as function
754   // attributes in the IR, keep track of them so we can embed them in a
755   // separate data section and use them when building the bitcode.
756   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
757     for (const auto &A : Args) {
758       // Do not encode output and input.
759       if (A->getOption().getID() == options::OPT_o ||
760           A->getOption().getID() == options::OPT_INPUT ||
761           A->getOption().getID() == options::OPT_x ||
762           A->getOption().getID() == options::OPT_fembed_bitcode ||
763           (A->getOption().getGroup().isValid() &&
764            A->getOption().getGroup().getID() == options::OPT_W_Group))
765         continue;
766       ArgStringList ASL;
767       A->render(Args, ASL);
768       for (const auto &arg : ASL) {
769         StringRef ArgStr(arg);
770         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
771         // using \00 to seperate each commandline options.
772         Opts.CmdArgs.push_back('\0');
773       }
774     }
775   }
776 
777   Opts.PreserveVec3Type = Args.hasArg(OPT_fpreserve_vec3_type);
778   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
779   Opts.XRayInstrumentFunctions = Args.hasArg(OPT_fxray_instrument);
780   Opts.XRayInstructionThreshold =
781       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_EQ, 200, Diags);
782   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
783   Opts.CallFEntry = Args.hasArg(OPT_mfentry);
784   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
785 
786   if (const Arg *A = Args.getLastArg(OPT_compress_debug_sections,
787                                      OPT_compress_debug_sections_EQ)) {
788     if (A->getOption().getID() == OPT_compress_debug_sections) {
789       // TODO: be more clever about the compression type auto-detection
790       Opts.setCompressDebugSections(llvm::DebugCompressionType::GNU);
791     } else {
792       auto DCT = llvm::StringSwitch<llvm::DebugCompressionType>(A->getValue())
793                      .Case("none", llvm::DebugCompressionType::None)
794                      .Case("zlib", llvm::DebugCompressionType::Z)
795                      .Case("zlib-gnu", llvm::DebugCompressionType::GNU)
796                      .Default(llvm::DebugCompressionType::None);
797       Opts.setCompressDebugSections(DCT);
798     }
799   }
800 
801   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
802   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
803   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
804     CodeGenOptions::BitcodeFileToLink F;
805     F.Filename = A->getValue();
806     if (A->getOption().matches(OPT_mlink_cuda_bitcode)) {
807       F.LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded;
808       // When linking CUDA bitcode, propagate function attributes so that
809       // e.g. libdevice gets fast-math attrs if we're building with fast-math.
810       F.PropagateAttrs = true;
811       F.Internalize = true;
812     }
813     Opts.LinkBitcodeFiles.push_back(F);
814   }
815   Opts.SanitizeCoverageType =
816       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
817   Opts.SanitizeCoverageIndirectCalls =
818       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
819   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
820   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
821   Opts.SanitizeCoverageTraceDiv = Args.hasArg(OPT_fsanitize_coverage_trace_div);
822   Opts.SanitizeCoverageTraceGep = Args.hasArg(OPT_fsanitize_coverage_trace_gep);
823   Opts.SanitizeCoverage8bitCounters =
824       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
825   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
826   Opts.SanitizeCoverageTracePCGuard =
827       Args.hasArg(OPT_fsanitize_coverage_trace_pc_guard);
828   Opts.SanitizeCoverageNoPrune = Args.hasArg(OPT_fsanitize_coverage_no_prune);
829   Opts.SanitizeCoverageInline8bitCounters =
830       Args.hasArg(OPT_fsanitize_coverage_inline_8bit_counters);
831   Opts.SanitizeCoveragePCTable = Args.hasArg(OPT_fsanitize_coverage_pc_table);
832   Opts.SanitizeCoverageStackDepth =
833       Args.hasArg(OPT_fsanitize_coverage_stack_depth);
834   Opts.SanitizeMemoryTrackOrigins =
835       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
836   Opts.SanitizeMemoryUseAfterDtor =
837       Args.hasFlag(OPT_fsanitize_memory_use_after_dtor,
838                    OPT_fno_sanitize_memory_use_after_dtor,
839                    false);
840   Opts.SanitizeMinimalRuntime = Args.hasArg(OPT_fsanitize_minimal_runtime);
841   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
842   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
843   if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_after_scope,
844                                OPT_fno_sanitize_address_use_after_scope)) {
845     Opts.SanitizeAddressUseAfterScope =
846         A->getOption().getID() == OPT_fsanitize_address_use_after_scope;
847   }
848   Opts.SanitizeAddressGlobalsDeadStripping =
849       Args.hasArg(OPT_fsanitize_address_globals_dead_stripping);
850   Opts.SSPBufferSize =
851       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
852   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
853   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
854     StringRef Val = A->getValue();
855     unsigned StackAlignment = Opts.StackAlignment;
856     Val.getAsInteger(10, StackAlignment);
857     Opts.StackAlignment = StackAlignment;
858   }
859 
860   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
861     StringRef Val = A->getValue();
862     unsigned StackProbeSize = Opts.StackProbeSize;
863     Val.getAsInteger(0, StackProbeSize);
864     Opts.StackProbeSize = StackProbeSize;
865   }
866 
867   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
868     StringRef Name = A->getValue();
869     unsigned Method = llvm::StringSwitch<unsigned>(Name)
870       .Case("legacy", CodeGenOptions::Legacy)
871       .Case("non-legacy", CodeGenOptions::NonLegacy)
872       .Case("mixed", CodeGenOptions::Mixed)
873       .Default(~0U);
874     if (Method == ~0U) {
875       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
876       Success = false;
877     } else {
878       Opts.setObjCDispatchMethod(
879         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
880     }
881   }
882 
883   Opts.EmulatedTLS =
884       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
885 
886   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
887     StringRef Name = A->getValue();
888     unsigned Model = llvm::StringSwitch<unsigned>(Name)
889         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
890         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
891         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
892         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
893         .Default(~0U);
894     if (Model == ~0U) {
895       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
896       Success = false;
897     } else {
898       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
899     }
900   }
901 
902   if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
903     StringRef Val = A->getValue();
904     if (Val == "ieee")
905       Opts.FPDenormalMode = "ieee";
906     else if (Val == "preserve-sign")
907       Opts.FPDenormalMode = "preserve-sign";
908     else if (Val == "positive-zero")
909       Opts.FPDenormalMode = "positive-zero";
910     else
911       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
912   }
913 
914   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
915     if (A->getOption().matches(OPT_fpcc_struct_return)) {
916       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
917     } else {
918       assert(A->getOption().matches(OPT_freg_struct_return));
919       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
920     }
921   }
922 
923   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
924   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
925   bool NeedLocTracking = false;
926 
927   Opts.OptRecordFile = Args.getLastArgValue(OPT_opt_record_file);
928   if (!Opts.OptRecordFile.empty())
929     NeedLocTracking = true;
930 
931   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
932     Opts.OptimizationRemarkPattern =
933         GenerateOptimizationRemarkRegex(Diags, Args, A);
934     NeedLocTracking = true;
935   }
936 
937   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
938     Opts.OptimizationRemarkMissedPattern =
939         GenerateOptimizationRemarkRegex(Diags, Args, A);
940     NeedLocTracking = true;
941   }
942 
943   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
944     Opts.OptimizationRemarkAnalysisPattern =
945         GenerateOptimizationRemarkRegex(Diags, Args, A);
946     NeedLocTracking = true;
947   }
948 
949   Opts.DiagnosticsWithHotness =
950       Args.hasArg(options::OPT_fdiagnostics_show_hotness);
951   bool UsingSampleProfile = !Opts.SampleProfileFile.empty();
952   bool UsingProfile = UsingSampleProfile ||
953       (Opts.getProfileUse() != CodeGenOptions::ProfileNone);
954 
955   if (Opts.DiagnosticsWithHotness && !UsingProfile)
956     Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
957         << "-fdiagnostics-show-hotness";
958 
959   Opts.DiagnosticsHotnessThreshold = getLastArgUInt64Value(
960       Args, options::OPT_fdiagnostics_hotness_threshold_EQ, 0);
961   if (Opts.DiagnosticsHotnessThreshold > 0 && !UsingProfile)
962     Diags.Report(diag::warn_drv_diagnostics_hotness_requires_pgo)
963         << "-fdiagnostics-hotness-threshold=";
964 
965   // If the user requested to use a sample profile for PGO, then the
966   // backend will need to track source location information so the profile
967   // can be incorporated into the IR.
968   if (UsingSampleProfile)
969     NeedLocTracking = true;
970 
971   // If the user requested a flag that requires source locations available in
972   // the backend, make sure that the backend tracks source location information.
973   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
974     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
975 
976   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
977 
978   // Parse -fsanitize-recover= arguments.
979   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
980   parseSanitizerKinds("-fsanitize-recover=",
981                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
982                       Opts.SanitizeRecover);
983   parseSanitizerKinds("-fsanitize-trap=",
984                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
985                       Opts.SanitizeTrap);
986 
987   Opts.CudaGpuBinaryFileNames =
988       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
989 
990   Opts.Backchain = Args.hasArg(OPT_mbackchain);
991 
992   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
993       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
994 
995   return Success;
996 }
997 
998 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
999                                       ArgList &Args) {
1000   using namespace options;
1001   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
1002   Opts.Targets = Args.getAllArgValues(OPT_MT);
1003   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
1004   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
1005   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
1006   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
1007   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
1008   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
1009   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
1010   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
1011   Opts.ModuleDependencyOutputDir =
1012       Args.getLastArgValue(OPT_module_dependency_dir);
1013   if (Args.hasArg(OPT_MV))
1014     Opts.OutputFormat = DependencyOutputFormat::NMake;
1015   // Add sanitizer blacklists as extra dependencies.
1016   // They won't be discovered by the regular preprocessor, so
1017   // we let make / ninja to know about this implicit dependency.
1018   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
1019   // Only the -fmodule-file=<file> form.
1020   for (const Arg *A : Args.filtered(OPT_fmodule_file)) {
1021     StringRef Val = A->getValue();
1022     if (Val.find('=') == StringRef::npos)
1023       Opts.ExtraDeps.push_back(Val);
1024   }
1025 }
1026 
1027 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
1028   // Color diagnostics default to auto ("on" if terminal supports) in the driver
1029   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
1030   // Support both clang's -f[no-]color-diagnostics and gcc's
1031   // -f[no-]diagnostics-colors[=never|always|auto].
1032   enum {
1033     Colors_On,
1034     Colors_Off,
1035     Colors_Auto
1036   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
1037   for (Arg *A : Args) {
1038     const Option &O = A->getOption();
1039     if (O.matches(options::OPT_fcolor_diagnostics) ||
1040         O.matches(options::OPT_fdiagnostics_color)) {
1041       ShowColors = Colors_On;
1042     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
1043                O.matches(options::OPT_fno_diagnostics_color)) {
1044       ShowColors = Colors_Off;
1045     } else if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
1046       StringRef Value(A->getValue());
1047       if (Value == "always")
1048         ShowColors = Colors_On;
1049       else if (Value == "never")
1050         ShowColors = Colors_Off;
1051       else if (Value == "auto")
1052         ShowColors = Colors_Auto;
1053     }
1054   }
1055   return ShowColors == Colors_On ||
1056          (ShowColors == Colors_Auto &&
1057           llvm::sys::Process::StandardErrHasColors());
1058 }
1059 
1060 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
1061                                 DiagnosticsEngine *Diags,
1062                                 bool DefaultDiagColor, bool DefaultShowOpt) {
1063   using namespace options;
1064   bool Success = true;
1065 
1066   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
1067   if (Arg *A =
1068           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
1069     Opts.DiagnosticSerializationFile = A->getValue();
1070   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
1071   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
1072   Opts.Pedantic = Args.hasArg(OPT_pedantic);
1073   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
1074   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
1075   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
1076   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
1077                                  OPT_fno_show_column,
1078                                  /*Default=*/true);
1079   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
1080   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
1081   Opts.AbsolutePath = Args.hasArg(OPT_fdiagnostics_absolute_paths);
1082   Opts.ShowOptionNames =
1083       Args.hasFlag(OPT_fdiagnostics_show_option,
1084                    OPT_fno_diagnostics_show_option, DefaultShowOpt);
1085 
1086   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
1087 
1088   // Default behavior is to not to show note include stacks.
1089   Opts.ShowNoteIncludeStack = false;
1090   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
1091                                OPT_fno_diagnostics_show_note_include_stack))
1092     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
1093       Opts.ShowNoteIncludeStack = true;
1094 
1095   StringRef ShowOverloads =
1096     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
1097   if (ShowOverloads == "best")
1098     Opts.setShowOverloads(Ovl_Best);
1099   else if (ShowOverloads == "all")
1100     Opts.setShowOverloads(Ovl_All);
1101   else {
1102     Success = false;
1103     if (Diags)
1104       Diags->Report(diag::err_drv_invalid_value)
1105       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
1106       << ShowOverloads;
1107   }
1108 
1109   StringRef ShowCategory =
1110     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
1111   if (ShowCategory == "none")
1112     Opts.ShowCategories = 0;
1113   else if (ShowCategory == "id")
1114     Opts.ShowCategories = 1;
1115   else if (ShowCategory == "name")
1116     Opts.ShowCategories = 2;
1117   else {
1118     Success = false;
1119     if (Diags)
1120       Diags->Report(diag::err_drv_invalid_value)
1121       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
1122       << ShowCategory;
1123   }
1124 
1125   StringRef Format =
1126     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
1127   if (Format == "clang")
1128     Opts.setFormat(DiagnosticOptions::Clang);
1129   else if (Format == "msvc")
1130     Opts.setFormat(DiagnosticOptions::MSVC);
1131   else if (Format == "msvc-fallback") {
1132     Opts.setFormat(DiagnosticOptions::MSVC);
1133     Opts.CLFallbackMode = true;
1134   } else if (Format == "vi")
1135     Opts.setFormat(DiagnosticOptions::Vi);
1136   else {
1137     Success = false;
1138     if (Diags)
1139       Diags->Report(diag::err_drv_invalid_value)
1140       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
1141       << Format;
1142   }
1143 
1144   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
1145   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
1146   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
1147   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
1148   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
1149   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
1150     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
1151     Diags, DiagMask);
1152   if (Args.hasArg(OPT_verify_ignore_unexpected))
1153     DiagMask = DiagnosticLevelMask::All;
1154   Opts.setVerifyIgnoreUnexpected(DiagMask);
1155   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1156   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1157   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1158   Opts.MacroBacktraceLimit =
1159       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1160                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1161   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1162       Args, OPT_ftemplate_backtrace_limit,
1163       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1164   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1165       Args, OPT_fconstexpr_backtrace_limit,
1166       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1167   Opts.SpellCheckingLimit = getLastArgIntValue(
1168       Args, OPT_fspell_checking_limit,
1169       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1170   Opts.SnippetLineLimit = getLastArgIntValue(
1171       Args, OPT_fcaret_diagnostics_max_lines,
1172       DiagnosticOptions::DefaultSnippetLineLimit, Diags);
1173   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1174                                     DiagnosticOptions::DefaultTabStop, Diags);
1175   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1176     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1177     if (Diags)
1178       Diags->Report(diag::warn_ignoring_ftabstop_value)
1179       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1180   }
1181   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1182   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1183   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1184 
1185   return Success;
1186 }
1187 
1188 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1189   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1190 }
1191 
1192 /// Parse the argument to the -ftest-module-file-extension
1193 /// command-line argument.
1194 ///
1195 /// \returns true on error, false on success.
1196 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1197                                             std::string &BlockName,
1198                                             unsigned &MajorVersion,
1199                                             unsigned &MinorVersion,
1200                                             bool &Hashed,
1201                                             std::string &UserInfo) {
1202   SmallVector<StringRef, 5> Args;
1203   Arg.split(Args, ':', 5);
1204   if (Args.size() < 5)
1205     return true;
1206 
1207   BlockName = Args[0];
1208   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1209   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1210   if (Args[3].getAsInteger(2, Hashed)) return true;
1211   if (Args.size() > 4)
1212     UserInfo = Args[4];
1213   return false;
1214 }
1215 
1216 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1217                                    DiagnosticsEngine &Diags,
1218                                    bool &IsHeaderFile) {
1219   using namespace options;
1220   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1221   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1222     switch (A->getOption().getID()) {
1223     default:
1224       llvm_unreachable("Invalid option in group!");
1225     case OPT_ast_list:
1226       Opts.ProgramAction = frontend::ASTDeclList; break;
1227     case OPT_ast_dump:
1228     case OPT_ast_dump_all:
1229     case OPT_ast_dump_lookups:
1230       Opts.ProgramAction = frontend::ASTDump; break;
1231     case OPT_ast_print:
1232       Opts.ProgramAction = frontend::ASTPrint; break;
1233     case OPT_ast_view:
1234       Opts.ProgramAction = frontend::ASTView; break;
1235     case OPT_dump_raw_tokens:
1236       Opts.ProgramAction = frontend::DumpRawTokens; break;
1237     case OPT_dump_tokens:
1238       Opts.ProgramAction = frontend::DumpTokens; break;
1239     case OPT_S:
1240       Opts.ProgramAction = frontend::EmitAssembly; break;
1241     case OPT_emit_llvm_bc:
1242       Opts.ProgramAction = frontend::EmitBC; break;
1243     case OPT_emit_html:
1244       Opts.ProgramAction = frontend::EmitHTML; break;
1245     case OPT_emit_llvm:
1246       Opts.ProgramAction = frontend::EmitLLVM; break;
1247     case OPT_emit_llvm_only:
1248       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1249     case OPT_emit_codegen_only:
1250       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1251     case OPT_emit_obj:
1252       Opts.ProgramAction = frontend::EmitObj; break;
1253     case OPT_fixit_EQ:
1254       Opts.FixItSuffix = A->getValue();
1255       // fall-through!
1256     case OPT_fixit:
1257       Opts.ProgramAction = frontend::FixIt; break;
1258     case OPT_emit_module:
1259       Opts.ProgramAction = frontend::GenerateModule; break;
1260     case OPT_emit_module_interface:
1261       Opts.ProgramAction = frontend::GenerateModuleInterface; break;
1262     case OPT_emit_pch:
1263       Opts.ProgramAction = frontend::GeneratePCH; break;
1264     case OPT_emit_pth:
1265       Opts.ProgramAction = frontend::GeneratePTH; break;
1266     case OPT_init_only:
1267       Opts.ProgramAction = frontend::InitOnly; break;
1268     case OPT_fsyntax_only:
1269       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1270     case OPT_module_file_info:
1271       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1272     case OPT_verify_pch:
1273       Opts.ProgramAction = frontend::VerifyPCH; break;
1274     case OPT_print_decl_contexts:
1275       Opts.ProgramAction = frontend::PrintDeclContext; break;
1276     case OPT_print_preamble:
1277       Opts.ProgramAction = frontend::PrintPreamble; break;
1278     case OPT_E:
1279       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1280     case OPT_rewrite_macros:
1281       Opts.ProgramAction = frontend::RewriteMacros; break;
1282     case OPT_rewrite_objc:
1283       Opts.ProgramAction = frontend::RewriteObjC; break;
1284     case OPT_rewrite_test:
1285       Opts.ProgramAction = frontend::RewriteTest; break;
1286     case OPT_analyze:
1287       Opts.ProgramAction = frontend::RunAnalysis; break;
1288     case OPT_migrate:
1289       Opts.ProgramAction = frontend::MigrateSource; break;
1290     case OPT_Eonly:
1291       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1292     }
1293   }
1294 
1295   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1296     Opts.Plugins.emplace_back(A->getValue(0));
1297     Opts.ProgramAction = frontend::PluginAction;
1298     Opts.ActionName = A->getValue();
1299   }
1300   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1301   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1302     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1303 
1304   for (const std::string &Arg :
1305          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1306     std::string BlockName;
1307     unsigned MajorVersion;
1308     unsigned MinorVersion;
1309     bool Hashed;
1310     std::string UserInfo;
1311     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1312                                         MinorVersion, Hashed, UserInfo)) {
1313       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1314 
1315       continue;
1316     }
1317 
1318     // Add the testing module file extension.
1319     Opts.ModuleFileExtensions.push_back(
1320         std::make_shared<TestModuleFileExtension>(
1321             BlockName, MajorVersion, MinorVersion, Hashed, UserInfo));
1322   }
1323 
1324   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1325     Opts.CodeCompletionAt =
1326       ParsedSourceLocation::FromString(A->getValue());
1327     if (Opts.CodeCompletionAt.FileName.empty())
1328       Diags.Report(diag::err_drv_invalid_value)
1329         << A->getAsString(Args) << A->getValue();
1330   }
1331   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1332 
1333   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1334   Opts.Plugins = Args.getAllArgValues(OPT_load);
1335   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1336   Opts.ShowHelp = Args.hasArg(OPT_help);
1337   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1338   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1339   Opts.ShowVersion = Args.hasArg(OPT_version);
1340   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1341   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1342   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1343   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1344   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1345   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1346   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1347   Opts.ASTDumpAll = Args.hasArg(OPT_ast_dump_all);
1348   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1349   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1350   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1351   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1352   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1353   // Only the -fmodule-file=<file> form.
1354   for (const Arg *A : Args.filtered(OPT_fmodule_file)) {
1355     StringRef Val = A->getValue();
1356     if (Val.find('=') == StringRef::npos)
1357       Opts.ModuleFiles.push_back(Val);
1358   }
1359   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1360   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1361   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
1362 
1363   Opts.CodeCompleteOpts.IncludeMacros
1364     = Args.hasArg(OPT_code_completion_macros);
1365   Opts.CodeCompleteOpts.IncludeCodePatterns
1366     = Args.hasArg(OPT_code_completion_patterns);
1367   Opts.CodeCompleteOpts.IncludeGlobals
1368     = !Args.hasArg(OPT_no_code_completion_globals);
1369   Opts.CodeCompleteOpts.IncludeBriefComments
1370     = Args.hasArg(OPT_code_completion_brief_comments);
1371 
1372   Opts.OverrideRecordLayoutsFile
1373     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1374   Opts.AuxTriple =
1375       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1376   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1377   Opts.StatsFile = Args.getLastArgValue(OPT_stats_file);
1378 
1379   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1380                                      OPT_arcmt_modify,
1381                                      OPT_arcmt_migrate)) {
1382     switch (A->getOption().getID()) {
1383     default:
1384       llvm_unreachable("missed a case");
1385     case OPT_arcmt_check:
1386       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1387       break;
1388     case OPT_arcmt_modify:
1389       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1390       break;
1391     case OPT_arcmt_migrate:
1392       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1393       break;
1394     }
1395   }
1396   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1397   Opts.ARCMTMigrateReportOut
1398     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1399   Opts.ARCMTMigrateEmitARCErrors
1400     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1401 
1402   if (Args.hasArg(OPT_objcmt_migrate_literals))
1403     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1404   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1405     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1406   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1407     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1408   if (Args.hasArg(OPT_objcmt_migrate_property))
1409     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1410   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1411     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1412   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1413     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1414   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1415     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1416   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1417     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1418   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1419     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1420   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1421     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1422   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1423     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1424   if (Args.hasArg(OPT_objcmt_atomic_property))
1425     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1426   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1427     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1428   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1429     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1430   if (Args.hasArg(OPT_objcmt_migrate_all))
1431     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1432 
1433   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1434 
1435   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1436       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1437     Diags.Report(diag::err_drv_argument_not_allowed_with)
1438       << "ARC migration" << "ObjC migration";
1439   }
1440 
1441   InputKind DashX(InputKind::Unknown);
1442   if (const Arg *A = Args.getLastArg(OPT_x)) {
1443     StringRef XValue = A->getValue();
1444 
1445     // Parse suffixes: '<lang>(-header|[-module-map][-cpp-output])'.
1446     // FIXME: Supporting '<lang>-header-cpp-output' would be useful.
1447     bool Preprocessed = XValue.consume_back("-cpp-output");
1448     bool ModuleMap = XValue.consume_back("-module-map");
1449     IsHeaderFile =
1450         !Preprocessed && !ModuleMap && XValue.consume_back("-header");
1451 
1452     // Principal languages.
1453     DashX = llvm::StringSwitch<InputKind>(XValue)
1454                 .Case("c", InputKind::C)
1455                 .Case("cl", InputKind::OpenCL)
1456                 .Case("cuda", InputKind::CUDA)
1457                 .Case("c++", InputKind::CXX)
1458                 .Case("objective-c", InputKind::ObjC)
1459                 .Case("objective-c++", InputKind::ObjCXX)
1460                 .Case("renderscript", InputKind::RenderScript)
1461                 .Default(InputKind::Unknown);
1462 
1463     // "objc[++]-cpp-output" is an acceptable synonym for
1464     // "objective-c[++]-cpp-output".
1465     if (DashX.isUnknown() && Preprocessed && !IsHeaderFile && !ModuleMap)
1466       DashX = llvm::StringSwitch<InputKind>(XValue)
1467                   .Case("objc", InputKind::ObjC)
1468                   .Case("objc++", InputKind::ObjCXX)
1469                   .Default(InputKind::Unknown);
1470 
1471     // Some special cases cannot be combined with suffixes.
1472     if (DashX.isUnknown() && !Preprocessed && !ModuleMap && !IsHeaderFile)
1473       DashX = llvm::StringSwitch<InputKind>(XValue)
1474                   .Case("cpp-output", InputKind(InputKind::C).getPreprocessed())
1475                   .Case("assembler-with-cpp", InputKind::Asm)
1476                   .Cases("ast", "pcm",
1477                          InputKind(InputKind::Unknown, InputKind::Precompiled))
1478                   .Case("ir", InputKind::LLVM_IR)
1479                   .Default(InputKind::Unknown);
1480 
1481     if (DashX.isUnknown())
1482       Diags.Report(diag::err_drv_invalid_value)
1483         << A->getAsString(Args) << A->getValue();
1484 
1485     if (Preprocessed)
1486       DashX = DashX.getPreprocessed();
1487     if (ModuleMap)
1488       DashX = DashX.withFormat(InputKind::ModuleMap);
1489   }
1490 
1491   // '-' is the default input if none is given.
1492   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1493   Opts.Inputs.clear();
1494   if (Inputs.empty())
1495     Inputs.push_back("-");
1496   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1497     InputKind IK = DashX;
1498     if (IK.isUnknown()) {
1499       IK = FrontendOptions::getInputKindForExtension(
1500         StringRef(Inputs[i]).rsplit('.').second);
1501       // FIXME: Warn on this?
1502       if (IK.isUnknown())
1503         IK = InputKind::C;
1504       // FIXME: Remove this hack.
1505       if (i == 0)
1506         DashX = IK;
1507     }
1508 
1509     // The -emit-module action implicitly takes a module map.
1510     if (Opts.ProgramAction == frontend::GenerateModule &&
1511         IK.getFormat() == InputKind::Source)
1512       IK = IK.withFormat(InputKind::ModuleMap);
1513 
1514     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1515   }
1516 
1517   return DashX;
1518 }
1519 
1520 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1521                                                  void *MainAddr) {
1522   std::string ClangExecutable =
1523       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1524   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1525 
1526   // Compute the path to the resource directory.
1527   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1528   SmallString<128> P(Dir);
1529   if (ClangResourceDir != "")
1530     llvm::sys::path::append(P, ClangResourceDir);
1531   else
1532     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1533                             "clang", CLANG_VERSION_STRING);
1534 
1535   return P.str();
1536 }
1537 
1538 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args,
1539                                   const std::string &WorkingDir) {
1540   using namespace options;
1541   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1542   Opts.Verbose = Args.hasArg(OPT_v);
1543   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1544   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1545   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1546   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1547     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1548   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1549 
1550   // Canonicalize -fmodules-cache-path before storing it.
1551   SmallString<128> P(Args.getLastArgValue(OPT_fmodules_cache_path));
1552   if (!(P.empty() || llvm::sys::path::is_absolute(P))) {
1553     if (WorkingDir.empty())
1554       llvm::sys::fs::make_absolute(P);
1555     else
1556       llvm::sys::fs::make_absolute(WorkingDir, P);
1557   }
1558   llvm::sys::path::remove_dots(P);
1559   Opts.ModuleCachePath = P.str();
1560 
1561   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1562   // Only the -fmodule-file=<name>=<file> form.
1563   for (const Arg *A : Args.filtered(OPT_fmodule_file)) {
1564     StringRef Val = A->getValue();
1565     if (Val.find('=') != StringRef::npos)
1566       Opts.PrebuiltModuleFiles.insert(Val.split('='));
1567   }
1568   for (const Arg *A : Args.filtered(OPT_fprebuilt_module_path))
1569     Opts.AddPrebuiltModulePath(A->getValue());
1570   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1571   Opts.ModulesHashContent = Args.hasArg(OPT_fmodules_hash_content);
1572   Opts.ModulesValidateDiagnosticOptions =
1573       !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
1574   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1575   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1576   Opts.ModuleCachePruneInterval =
1577       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1578   Opts.ModuleCachePruneAfter =
1579       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1580   Opts.ModulesValidateOncePerBuildSession =
1581       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1582   Opts.BuildSessionTimestamp =
1583       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1584   Opts.ModulesValidateSystemHeaders =
1585       Args.hasArg(OPT_fmodules_validate_system_headers);
1586   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1587     Opts.ModuleFormat = A->getValue();
1588 
1589   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1590     StringRef MacroDef = A->getValue();
1591     Opts.ModulesIgnoreMacros.insert(
1592         llvm::CachedHashString(MacroDef.split('=').first));
1593   }
1594 
1595   // Add -I..., -F..., and -index-header-map options in order.
1596   bool IsIndexHeaderMap = false;
1597   bool IsSysrootSpecified =
1598       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1599   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1600     if (A->getOption().matches(OPT_index_header_map)) {
1601       // -index-header-map applies to the next -I or -F.
1602       IsIndexHeaderMap = true;
1603       continue;
1604     }
1605 
1606     frontend::IncludeDirGroup Group =
1607         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1608 
1609     bool IsFramework = A->getOption().matches(OPT_F);
1610     std::string Path = A->getValue();
1611 
1612     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1613       SmallString<32> Buffer;
1614       llvm::sys::path::append(Buffer, Opts.Sysroot,
1615                               llvm::StringRef(A->getValue()).substr(1));
1616       Path = Buffer.str();
1617     }
1618 
1619     Opts.AddPath(Path, Group, IsFramework,
1620                  /*IgnoreSysroot*/ true);
1621     IsIndexHeaderMap = false;
1622   }
1623 
1624   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1625   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1626   for (const Arg *A :
1627        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1628     if (A->getOption().matches(OPT_iprefix))
1629       Prefix = A->getValue();
1630     else if (A->getOption().matches(OPT_iwithprefix))
1631       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1632     else
1633       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1634   }
1635 
1636   for (const Arg *A : Args.filtered(OPT_idirafter))
1637     Opts.AddPath(A->getValue(), frontend::After, false, true);
1638   for (const Arg *A : Args.filtered(OPT_iquote))
1639     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1640   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1641     Opts.AddPath(A->getValue(), frontend::System, false,
1642                  !A->getOption().matches(OPT_iwithsysroot));
1643   for (const Arg *A : Args.filtered(OPT_iframework))
1644     Opts.AddPath(A->getValue(), frontend::System, true, true);
1645   for (const Arg *A : Args.filtered(OPT_iframeworkwithsysroot))
1646     Opts.AddPath(A->getValue(), frontend::System, /*IsFramework=*/true,
1647                  /*IgnoreSysRoot=*/false);
1648 
1649   // Add the paths for the various language specific isystem flags.
1650   for (const Arg *A : Args.filtered(OPT_c_isystem))
1651     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1652   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1653     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1654   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1655     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1656   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1657     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1658 
1659   // Add the internal paths from a driver that detects standard include paths.
1660   for (const Arg *A :
1661        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1662     frontend::IncludeDirGroup Group = frontend::System;
1663     if (A->getOption().matches(OPT_internal_externc_isystem))
1664       Group = frontend::ExternCSystem;
1665     Opts.AddPath(A->getValue(), Group, false, true);
1666   }
1667 
1668   // Add the path prefixes which are implicitly treated as being system headers.
1669   for (const Arg *A :
1670        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1671     Opts.AddSystemHeaderPrefix(
1672         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1673 
1674   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1675     Opts.AddVFSOverlayFile(A->getValue());
1676 }
1677 
1678 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1679                                          const llvm::Triple &T,
1680                                          PreprocessorOptions &PPOpts,
1681                                          LangStandard::Kind LangStd) {
1682   // Set some properties which depend solely on the input kind; it would be nice
1683   // to move these to the language standard, and have the driver resolve the
1684   // input kind + language standard.
1685   //
1686   // FIXME: Perhaps a better model would be for a single source file to have
1687   // multiple language standards (C / C++ std, ObjC std, OpenCL std, OpenMP std)
1688   // simultaneously active?
1689   if (IK.getLanguage() == InputKind::Asm) {
1690     Opts.AsmPreprocessor = 1;
1691   } else if (IK.isObjectiveC()) {
1692     Opts.ObjC1 = Opts.ObjC2 = 1;
1693   }
1694 
1695   if (LangStd == LangStandard::lang_unspecified) {
1696     // Based on the base language, pick one.
1697     switch (IK.getLanguage()) {
1698     case InputKind::Unknown:
1699     case InputKind::LLVM_IR:
1700       llvm_unreachable("Invalid input kind!");
1701     case InputKind::OpenCL:
1702       LangStd = LangStandard::lang_opencl10;
1703       break;
1704     case InputKind::CUDA:
1705       LangStd = LangStandard::lang_cuda;
1706       break;
1707     case InputKind::Asm:
1708     case InputKind::C:
1709       // The PS4 uses C99 as the default C standard.
1710       if (T.isPS4())
1711         LangStd = LangStandard::lang_gnu99;
1712       else
1713         LangStd = LangStandard::lang_gnu11;
1714       break;
1715     case InputKind::ObjC:
1716       LangStd = LangStandard::lang_gnu11;
1717       break;
1718     case InputKind::CXX:
1719     case InputKind::ObjCXX:
1720       // The PS4 uses C++11 as the default C++ standard.
1721       if (T.isPS4())
1722         LangStd = LangStandard::lang_gnucxx11;
1723       else
1724         LangStd = LangStandard::lang_gnucxx98;
1725       break;
1726     case InputKind::RenderScript:
1727       LangStd = LangStandard::lang_c99;
1728       break;
1729     }
1730   }
1731 
1732   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1733   Opts.LineComment = Std.hasLineComments();
1734   Opts.C99 = Std.isC99();
1735   Opts.C11 = Std.isC11();
1736   Opts.CPlusPlus = Std.isCPlusPlus();
1737   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1738   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1739   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1740   Opts.CPlusPlus2a = Std.isCPlusPlus2a();
1741   Opts.Digraphs = Std.hasDigraphs();
1742   Opts.GNUMode = Std.isGNUMode();
1743   Opts.GNUInline = !Opts.C99 && !Opts.CPlusPlus;
1744   Opts.HexFloats = Std.hasHexFloats();
1745   Opts.ImplicitInt = Std.hasImplicitInt();
1746 
1747   // Set OpenCL Version.
1748   Opts.OpenCL = Std.isOpenCL();
1749   if (LangStd == LangStandard::lang_opencl10)
1750     Opts.OpenCLVersion = 100;
1751   else if (LangStd == LangStandard::lang_opencl11)
1752     Opts.OpenCLVersion = 110;
1753   else if (LangStd == LangStandard::lang_opencl12)
1754     Opts.OpenCLVersion = 120;
1755   else if (LangStd == LangStandard::lang_opencl20)
1756     Opts.OpenCLVersion = 200;
1757 
1758   // OpenCL has some additional defaults.
1759   if (Opts.OpenCL) {
1760     Opts.AltiVec = 0;
1761     Opts.ZVector = 0;
1762     Opts.LaxVectorConversions = 0;
1763     Opts.setDefaultFPContractMode(LangOptions::FPC_On);
1764     Opts.NativeHalfType = 1;
1765     Opts.NativeHalfArgsAndReturns = 1;
1766     // Include default header file for OpenCL.
1767     if (Opts.IncludeDefaultHeader) {
1768       PPOpts.Includes.push_back("opencl-c.h");
1769     }
1770   }
1771 
1772   Opts.CUDA = IK.getLanguage() == InputKind::CUDA;
1773   if (Opts.CUDA)
1774     // Set default FP_CONTRACT to FAST.
1775     Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
1776 
1777   Opts.RenderScript = IK.getLanguage() == InputKind::RenderScript;
1778   if (Opts.RenderScript) {
1779     Opts.NativeHalfType = 1;
1780     Opts.NativeHalfArgsAndReturns = 1;
1781   }
1782 
1783   // OpenCL and C++ both have bool, true, false keywords.
1784   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1785 
1786   // OpenCL has half keyword
1787   Opts.Half = Opts.OpenCL;
1788 
1789   // C++ has wchar_t keyword.
1790   Opts.WChar = Opts.CPlusPlus;
1791 
1792   Opts.GNUKeywords = Opts.GNUMode;
1793   Opts.CXXOperatorNames = Opts.CPlusPlus;
1794 
1795   Opts.AlignedAllocation = Opts.CPlusPlus1z;
1796 
1797   Opts.DollarIdents = !Opts.AsmPreprocessor;
1798 }
1799 
1800 /// Attempt to parse a visibility value out of the given argument.
1801 static Visibility parseVisibility(Arg *arg, ArgList &args,
1802                                   DiagnosticsEngine &diags) {
1803   StringRef value = arg->getValue();
1804   if (value == "default") {
1805     return DefaultVisibility;
1806   } else if (value == "hidden" || value == "internal") {
1807     return HiddenVisibility;
1808   } else if (value == "protected") {
1809     // FIXME: diagnose if target does not support protected visibility
1810     return ProtectedVisibility;
1811   }
1812 
1813   diags.Report(diag::err_drv_invalid_value)
1814     << arg->getAsString(args) << value;
1815   return DefaultVisibility;
1816 }
1817 
1818 /// Check if input file kind and language standard are compatible.
1819 static bool IsInputCompatibleWithStandard(InputKind IK,
1820                                           const LangStandard &S) {
1821   switch (IK.getLanguage()) {
1822   case InputKind::Unknown:
1823   case InputKind::LLVM_IR:
1824     llvm_unreachable("should not parse language flags for this input");
1825 
1826   case InputKind::C:
1827   case InputKind::ObjC:
1828   case InputKind::RenderScript:
1829     return S.getLanguage() == InputKind::C;
1830 
1831   case InputKind::OpenCL:
1832     return S.getLanguage() == InputKind::OpenCL;
1833 
1834   case InputKind::CXX:
1835   case InputKind::ObjCXX:
1836     return S.getLanguage() == InputKind::CXX;
1837 
1838   case InputKind::CUDA:
1839     // FIXME: What -std= values should be permitted for CUDA compilations?
1840     return S.getLanguage() == InputKind::CUDA ||
1841            S.getLanguage() == InputKind::CXX;
1842 
1843   case InputKind::Asm:
1844     // Accept (and ignore) all -std= values.
1845     // FIXME: The -std= value is not ignored; it affects the tokenization
1846     // and preprocessing rules if we're preprocessing this asm input.
1847     return true;
1848   }
1849 
1850   llvm_unreachable("unexpected input language");
1851 }
1852 
1853 /// Get language name for given input kind.
1854 static const StringRef GetInputKindName(InputKind IK) {
1855   switch (IK.getLanguage()) {
1856   case InputKind::C:
1857     return "C";
1858   case InputKind::ObjC:
1859     return "Objective-C";
1860   case InputKind::CXX:
1861     return "C++";
1862   case InputKind::ObjCXX:
1863     return "Objective-C++";
1864   case InputKind::OpenCL:
1865     return "OpenCL";
1866   case InputKind::CUDA:
1867     return "CUDA";
1868   case InputKind::RenderScript:
1869     return "RenderScript";
1870 
1871   case InputKind::Asm:
1872     return "Asm";
1873   case InputKind::LLVM_IR:
1874     return "LLVM IR";
1875 
1876   case InputKind::Unknown:
1877     break;
1878   }
1879   llvm_unreachable("unknown input language");
1880 }
1881 
1882 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1883                           const TargetOptions &TargetOpts,
1884                           PreprocessorOptions &PPOpts,
1885                           DiagnosticsEngine &Diags) {
1886   // FIXME: Cleanup per-file based stuff.
1887   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1888   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1889     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1890 #define LANGSTANDARD(id, name, lang, desc, features) \
1891       .Case(name, LangStandard::lang_##id)
1892 #define LANGSTANDARD_ALIAS(id, alias) \
1893       .Case(alias, LangStandard::lang_##id)
1894 #include "clang/Frontend/LangStandards.def"
1895       .Default(LangStandard::lang_unspecified);
1896     if (LangStd == LangStandard::lang_unspecified) {
1897       Diags.Report(diag::err_drv_invalid_value)
1898         << A->getAsString(Args) << A->getValue();
1899       // Report supported standards with short description.
1900       for (unsigned KindValue = 0;
1901            KindValue != LangStandard::lang_unspecified;
1902            ++KindValue) {
1903         const LangStandard &Std = LangStandard::getLangStandardForKind(
1904           static_cast<LangStandard::Kind>(KindValue));
1905         if (IsInputCompatibleWithStandard(IK, Std)) {
1906           auto Diag = Diags.Report(diag::note_drv_use_standard);
1907           Diag << Std.getName() << Std.getDescription();
1908           unsigned NumAliases = 0;
1909 #define LANGSTANDARD(id, name, lang, desc, features)
1910 #define LANGSTANDARD_ALIAS(id, alias) \
1911           if (KindValue == LangStandard::lang_##id) ++NumAliases;
1912 #define LANGSTANDARD_ALIAS_DEPR(id, alias)
1913 #include "clang/Frontend/LangStandards.def"
1914           Diag << NumAliases;
1915 #define LANGSTANDARD(id, name, lang, desc, features)
1916 #define LANGSTANDARD_ALIAS(id, alias) \
1917           if (KindValue == LangStandard::lang_##id) Diag << alias;
1918 #define LANGSTANDARD_ALIAS_DEPR(id, alias)
1919 #include "clang/Frontend/LangStandards.def"
1920         }
1921       }
1922     } else {
1923       // Valid standard, check to make sure language and standard are
1924       // compatible.
1925       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1926       if (!IsInputCompatibleWithStandard(IK, Std)) {
1927         Diags.Report(diag::err_drv_argument_not_allowed_with)
1928           << A->getAsString(Args) << GetInputKindName(IK);
1929       }
1930     }
1931   }
1932 
1933   // -cl-std only applies for OpenCL language standards.
1934   // Override the -std option in this case.
1935   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1936     LangStandard::Kind OpenCLLangStd
1937       = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1938         .Cases("cl", "CL", LangStandard::lang_opencl10)
1939         .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
1940         .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
1941         .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
1942         .Default(LangStandard::lang_unspecified);
1943 
1944     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1945       Diags.Report(diag::err_drv_invalid_value)
1946         << A->getAsString(Args) << A->getValue();
1947     }
1948     else
1949       LangStd = OpenCLLangStd;
1950   }
1951 
1952   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
1953 
1954   llvm::Triple T(TargetOpts.Triple);
1955   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
1956 
1957   // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
1958   // This option should be deprecated for CL > 1.0 because
1959   // this option was added for compatibility with OpenCL 1.0.
1960   if (Args.getLastArg(OPT_cl_strict_aliasing)
1961        && Opts.OpenCLVersion > 100) {
1962     std::string VerSpec = llvm::to_string(Opts.OpenCLVersion / 100) +
1963                           std::string(".") +
1964                           llvm::to_string((Opts.OpenCLVersion % 100) / 10);
1965     Diags.Report(diag::warn_option_invalid_ocl_version)
1966       << VerSpec << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
1967   }
1968 
1969   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1970   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1971   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1972   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1973   // name, as it doesn't seem a useful distinction.
1974   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1975                                   Opts.GNUKeywords);
1976 
1977   if (Args.hasArg(OPT_fno_operator_names))
1978     Opts.CXXOperatorNames = 0;
1979 
1980   if (Args.hasArg(OPT_fcuda_is_device))
1981     Opts.CUDAIsDevice = 1;
1982 
1983   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1984     Opts.CUDAAllowVariadicFunctions = 1;
1985 
1986   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1987     Opts.CUDAHostDeviceConstexpr = 0;
1988 
1989   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1990     Opts.CUDADeviceFlushDenormalsToZero = 1;
1991 
1992   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1993     Opts.CUDADeviceApproxTranscendentals = 1;
1994 
1995   if (Opts.ObjC1) {
1996     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1997       StringRef value = arg->getValue();
1998       if (Opts.ObjCRuntime.tryParse(value))
1999         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
2000     }
2001 
2002     if (Args.hasArg(OPT_fobjc_gc_only))
2003       Opts.setGC(LangOptions::GCOnly);
2004     else if (Args.hasArg(OPT_fobjc_gc))
2005       Opts.setGC(LangOptions::HybridGC);
2006     else if (Args.hasArg(OPT_fobjc_arc)) {
2007       Opts.ObjCAutoRefCount = 1;
2008       if (!Opts.ObjCRuntime.allowsARC())
2009         Diags.Report(diag::err_arc_unsupported_on_runtime);
2010     }
2011 
2012     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
2013     // whether the feature is actually enabled.  This is predominantly
2014     // determined by -fobjc-runtime, but we allow it to be overridden
2015     // from the command line for testing purposes.
2016     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
2017       Opts.ObjCWeakRuntime = 1;
2018     else
2019       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
2020 
2021     // ObjCWeak determines whether __weak is actually enabled.
2022     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
2023     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
2024       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
2025         assert(!Opts.ObjCWeak);
2026       } else if (Opts.getGC() != LangOptions::NonGC) {
2027         Diags.Report(diag::err_objc_weak_with_gc);
2028       } else if (!Opts.ObjCWeakRuntime) {
2029         Diags.Report(diag::err_objc_weak_unsupported);
2030       } else {
2031         Opts.ObjCWeak = 1;
2032       }
2033     } else if (Opts.ObjCAutoRefCount) {
2034       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
2035     }
2036 
2037     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
2038       Opts.ObjCInferRelatedResultType = 0;
2039 
2040     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
2041       Opts.ObjCSubscriptingLegacyRuntime =
2042         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
2043   }
2044 
2045   if (Args.hasArg(OPT_fgnu89_inline)) {
2046     if (Opts.CPlusPlus)
2047       Diags.Report(diag::err_drv_argument_not_allowed_with)
2048         << "-fgnu89-inline" << GetInputKindName(IK);
2049     else
2050       Opts.GNUInline = 1;
2051   }
2052 
2053   if (Args.hasArg(OPT_fapple_kext)) {
2054     if (!Opts.CPlusPlus)
2055       Diags.Report(diag::warn_c_kext);
2056     else
2057       Opts.AppleKext = 1;
2058   }
2059 
2060   if (Args.hasArg(OPT_print_ivar_layout))
2061     Opts.ObjCGCBitmapPrint = 1;
2062   if (Args.hasArg(OPT_fno_constant_cfstrings))
2063     Opts.NoConstantCFStrings = 1;
2064 
2065   if (Args.hasArg(OPT_fzvector))
2066     Opts.ZVector = 1;
2067 
2068   if (Args.hasArg(OPT_pthread))
2069     Opts.POSIXThreads = 1;
2070 
2071   // The value-visibility mode defaults to "default".
2072   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
2073     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
2074   } else {
2075     Opts.setValueVisibilityMode(DefaultVisibility);
2076   }
2077 
2078   // The type-visibility mode defaults to the value-visibility mode.
2079   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
2080     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
2081   } else {
2082     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
2083   }
2084 
2085   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
2086     Opts.InlineVisibilityHidden = 1;
2087 
2088   if (Args.hasArg(OPT_ftrapv)) {
2089     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
2090     // Set the handler, if one is specified.
2091     Opts.OverflowHandler =
2092         Args.getLastArgValue(OPT_ftrapv_handler);
2093   }
2094   else if (Args.hasArg(OPT_fwrapv))
2095     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
2096 
2097   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
2098   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
2099   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
2100   Opts.MSCompatibilityVersion = 0;
2101   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
2102     VersionTuple VT;
2103     if (VT.tryParse(A->getValue()))
2104       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2105                                                 << A->getValue();
2106     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
2107                                   VT.getMinor().getValueOr(0) * 100000 +
2108                                   VT.getSubminor().getValueOr(0);
2109   }
2110 
2111   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
2112   // is specified, or -std is set to a conforming mode.
2113   // Trigraphs are disabled by default in c++1z onwards.
2114   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
2115   Opts.Trigraphs =
2116       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
2117 
2118   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
2119                                    OPT_fno_dollars_in_identifiers,
2120                                    Opts.DollarIdents);
2121   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
2122   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
2123   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
2124   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
2125   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
2126                                    Opts.ConstStrings);
2127   if (Args.hasArg(OPT_fno_lax_vector_conversions))
2128     Opts.LaxVectorConversions = 0;
2129   if (Args.hasArg(OPT_fno_threadsafe_statics))
2130     Opts.ThreadsafeStatics = 0;
2131   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
2132   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
2133   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
2134   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
2135   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
2136   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
2137 
2138   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
2139   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
2140   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
2141     && Opts.OpenCLVersion >= 200);
2142   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
2143   Opts.CoroutinesTS = Args.hasArg(OPT_fcoroutines_ts);
2144 
2145   // Enable [[]] attributes in C++11 by default.
2146   Opts.DoubleSquareBracketAttributes =
2147       Args.hasFlag(OPT_fdouble_square_bracket_attributes,
2148                    OPT_fno_double_square_bracket_attributes, Opts.CPlusPlus11);
2149 
2150   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
2151   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
2152   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
2153   Opts.ModulesDeclUse =
2154       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
2155   Opts.ModulesLocalVisibility =
2156       Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS;
2157   Opts.ModulesCodegen = Args.hasArg(OPT_fmodules_codegen);
2158   Opts.ModulesDebugInfo = Args.hasArg(OPT_fmodules_debuginfo);
2159   Opts.ModulesSearchAll = Opts.Modules &&
2160     !Args.hasArg(OPT_fno_modules_search_all) &&
2161     Args.hasArg(OPT_fmodules_search_all);
2162   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
2163   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
2164   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
2165   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
2166   if (const Arg *A = Args.getLastArg(OPT_fwchar_type_EQ)) {
2167     Opts.WCharSize = llvm::StringSwitch<unsigned>(A->getValue())
2168                          .Case("char", 1)
2169                          .Case("short", 2)
2170                          .Case("int", 4)
2171                          .Default(0);
2172     if (Opts.WCharSize == 0)
2173       Diags.Report(diag::err_fe_invalid_wchar_type) << A->getValue();
2174   }
2175   Opts.WCharIsSigned = Args.hasFlag(OPT_fsigned_wchar, OPT_fno_signed_wchar, true);
2176   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
2177   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
2178   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
2179   if (!Opts.NoBuiltin)
2180     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
2181   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
2182   Opts.RelaxedTemplateTemplateArgs =
2183       Args.hasArg(OPT_frelaxed_template_template_args);
2184   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
2185   Opts.AlignedAllocation =
2186       Args.hasFlag(OPT_faligned_allocation, OPT_fno_aligned_allocation,
2187                    Opts.AlignedAllocation);
2188   Opts.AlignedAllocationUnavailable =
2189       Opts.AlignedAllocation && Args.hasArg(OPT_aligned_alloc_unavailable);
2190   Opts.NewAlignOverride =
2191       getLastArgIntValue(Args, OPT_fnew_alignment_EQ, 0, Diags);
2192   if (Opts.NewAlignOverride && !llvm::isPowerOf2_32(Opts.NewAlignOverride)) {
2193     Arg *A = Args.getLastArg(OPT_fnew_alignment_EQ);
2194     Diags.Report(diag::err_fe_invalid_alignment) << A->getAsString(Args)
2195                                                  << A->getValue();
2196     Opts.NewAlignOverride = 0;
2197   }
2198   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
2199   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
2200   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
2201   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
2202   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
2203   Opts.InstantiationDepth =
2204       getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
2205   Opts.ArrowDepth =
2206       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
2207   Opts.ConstexprCallDepth =
2208       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
2209   Opts.ConstexprStepLimit =
2210       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
2211   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
2212   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
2213   Opts.NumLargeByValueCopy =
2214       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
2215   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
2216   Opts.ObjCConstantStringClass =
2217     Args.getLastArgValue(OPT_fconstant_string_class);
2218   Opts.ObjCDefaultSynthProperties =
2219     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
2220   Opts.EncodeExtendedBlockSig =
2221     Args.hasArg(OPT_fencode_extended_block_signature);
2222   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
2223   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
2224   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
2225   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
2226   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2227   Opts.PIE = Args.hasArg(OPT_pic_is_pie);
2228   Opts.Static = Args.hasArg(OPT_static_define);
2229   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
2230   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
2231                         || Args.hasArg(OPT_fdump_record_layouts);
2232   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
2233   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
2234   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
2235   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
2236   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
2237   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
2238   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
2239   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
2240   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
2241   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
2242   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
2243   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
2244   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
2245   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
2246   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
2247   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
2248   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
2249   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
2250   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
2251   // is enabled.
2252   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
2253                             | Opts.NativeHalfArgsAndReturns;
2254   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
2255 
2256   // __declspec is enabled by default for the PS4 by the driver, and also
2257   // enabled for Microsoft Extensions or Borland Extensions, here.
2258   //
2259   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
2260   // CUDA extension. However, it is required for supporting
2261   // __clang_cuda_builtin_vars.h, which uses __declspec(property). Once that has
2262   // been rewritten in terms of something more generic, remove the Opts.CUDA
2263   // term here.
2264   Opts.DeclSpecKeyword =
2265       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
2266                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
2267 
2268   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
2269     switch (llvm::StringSwitch<unsigned>(A->getValue())
2270       .Case("target", LangOptions::ASMM_Target)
2271       .Case("no", LangOptions::ASMM_Off)
2272       .Case("yes", LangOptions::ASMM_On)
2273       .Default(255)) {
2274     default:
2275       Diags.Report(diag::err_drv_invalid_value)
2276         << "-faddress-space-map-mangling=" << A->getValue();
2277       break;
2278     case LangOptions::ASMM_Target:
2279       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
2280       break;
2281     case LangOptions::ASMM_On:
2282       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
2283       break;
2284     case LangOptions::ASMM_Off:
2285       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
2286       break;
2287     }
2288   }
2289 
2290   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
2291     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
2292         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
2293             A->getValue())
2294             .Case("single",
2295                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
2296             .Case("multiple",
2297                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
2298             .Case("virtual",
2299                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
2300             .Default(LangOptions::PPTMK_BestCase);
2301     if (InheritanceModel == LangOptions::PPTMK_BestCase)
2302       Diags.Report(diag::err_drv_invalid_value)
2303           << "-fms-memptr-rep=" << A->getValue();
2304 
2305     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
2306   }
2307 
2308   // Check for MS default calling conventions being specified.
2309   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
2310     LangOptions::DefaultCallingConvention DefaultCC =
2311         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
2312             A->getValue())
2313             .Case("cdecl", LangOptions::DCC_CDecl)
2314             .Case("fastcall", LangOptions::DCC_FastCall)
2315             .Case("stdcall", LangOptions::DCC_StdCall)
2316             .Case("vectorcall", LangOptions::DCC_VectorCall)
2317             .Default(LangOptions::DCC_None);
2318     if (DefaultCC == LangOptions::DCC_None)
2319       Diags.Report(diag::err_drv_invalid_value)
2320           << "-fdefault-calling-conv=" << A->getValue();
2321 
2322     llvm::Triple T(TargetOpts.Triple);
2323     llvm::Triple::ArchType Arch = T.getArch();
2324     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2325                       DefaultCC == LangOptions::DCC_StdCall) &&
2326                      Arch != llvm::Triple::x86;
2327     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
2328                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2329     if (emitError)
2330       Diags.Report(diag::err_drv_argument_not_allowed_with)
2331           << A->getSpelling() << T.getTriple();
2332     else
2333       Opts.setDefaultCallingConv(DefaultCC);
2334   }
2335 
2336   // -mrtd option
2337   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2338     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2339       Diags.Report(diag::err_drv_argument_not_allowed_with)
2340           << A->getSpelling() << "-fdefault-calling-conv";
2341     else {
2342       llvm::Triple T(TargetOpts.Triple);
2343       if (T.getArch() != llvm::Triple::x86)
2344         Diags.Report(diag::err_drv_argument_not_allowed_with)
2345             << A->getSpelling() << T.getTriple();
2346       else
2347         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2348     }
2349   }
2350 
2351   // Check if -fopenmp is specified.
2352   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2353   Opts.OpenMPUseTLS =
2354       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2355   Opts.OpenMPIsDevice =
2356       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2357 
2358   if (Opts.OpenMP) {
2359     int Version =
2360         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2361     if (Version != 0)
2362       Opts.OpenMP = Version;
2363     // Provide diagnostic when a given target is not expected to be an OpenMP
2364     // device or host.
2365     if (!Opts.OpenMPIsDevice) {
2366       switch (T.getArch()) {
2367       default:
2368         break;
2369       // Add unsupported host targets here:
2370       case llvm::Triple::nvptx:
2371       case llvm::Triple::nvptx64:
2372         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2373             << TargetOpts.Triple;
2374         break;
2375       }
2376     }
2377   }
2378 
2379   // Set the flag to prevent the implementation from emitting device exception
2380   // handling code for those requiring so.
2381   if (Opts.OpenMPIsDevice && T.isNVPTX()) {
2382     Opts.Exceptions = 0;
2383     Opts.CXXExceptions = 0;
2384   }
2385 
2386   // Get the OpenMP target triples if any.
2387   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
2388 
2389     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2390       llvm::Triple TT(A->getValue(i));
2391 
2392       if (TT.getArch() == llvm::Triple::UnknownArch ||
2393           !(TT.getArch() == llvm::Triple::ppc ||
2394             TT.getArch() == llvm::Triple::ppc64 ||
2395             TT.getArch() == llvm::Triple::ppc64le ||
2396             TT.getArch() == llvm::Triple::nvptx ||
2397             TT.getArch() == llvm::Triple::nvptx64 ||
2398             TT.getArch() == llvm::Triple::x86 ||
2399             TT.getArch() == llvm::Triple::x86_64))
2400         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2401       else
2402         Opts.OMPTargetTriples.push_back(TT);
2403     }
2404   }
2405 
2406   // Get OpenMP host file path if any and report if a non existent file is
2407   // found
2408   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
2409     Opts.OMPHostIRFile = A->getValue();
2410     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2411       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2412           << Opts.OMPHostIRFile;
2413   }
2414 
2415   // Record whether the __DEPRECATED define was requested.
2416   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2417                                  OPT_fno_deprecated_macro,
2418                                  Opts.Deprecated);
2419 
2420   // FIXME: Eliminate this dependency.
2421   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2422        OptSize = getOptimizationLevelSize(Args);
2423   Opts.Optimize = Opt != 0;
2424   Opts.OptimizeSize = OptSize != 0;
2425 
2426   // This is the __NO_INLINE__ define, which just depends on things like the
2427   // optimization level and -fno-inline, not actually whether the backend has
2428   // inlining enabled.
2429   Opts.NoInlineDefine = !Opts.Optimize;
2430   if (Arg *InlineArg = Args.getLastArg(
2431           options::OPT_finline_functions, options::OPT_finline_hint_functions,
2432           options::OPT_fno_inline_functions, options::OPT_fno_inline))
2433     if (InlineArg->getOption().matches(options::OPT_fno_inline))
2434       Opts.NoInlineDefine = true;
2435 
2436   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2437       Args.hasArg(OPT_cl_fast_relaxed_math);
2438   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2439       Args.hasArg(OPT_cl_finite_math_only) ||
2440       Args.hasArg(OPT_cl_fast_relaxed_math);
2441   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2442                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2443                       Args.hasArg(OPT_cl_fast_relaxed_math);
2444 
2445   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
2446     StringRef Val = A->getValue();
2447     if (Val == "fast")
2448       Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
2449     else if (Val == "on")
2450       Opts.setDefaultFPContractMode(LangOptions::FPC_On);
2451     else if (Val == "off")
2452       Opts.setDefaultFPContractMode(LangOptions::FPC_Off);
2453     else
2454       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
2455   }
2456 
2457   Opts.RetainCommentsFromSystemHeaders =
2458       Args.hasArg(OPT_fretain_comments_from_system_headers);
2459 
2460   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2461   switch (SSP) {
2462   default:
2463     Diags.Report(diag::err_drv_invalid_value)
2464       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2465     break;
2466   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2467   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2468   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2469   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2470   }
2471 
2472   // Parse -fsanitize= arguments.
2473   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2474                       Diags, Opts.Sanitize);
2475   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2476   Opts.SanitizeAddressFieldPadding =
2477       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2478   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2479 
2480   // -fxray-instrument
2481   Opts.XRayInstrument =
2482       Args.hasFlag(OPT_fxray_instrument, OPT_fnoxray_instrument, false);
2483 
2484   // -fxray-{always,never}-instrument= filenames.
2485   Opts.XRayAlwaysInstrumentFiles =
2486       Args.getAllArgValues(OPT_fxray_always_instrument);
2487   Opts.XRayNeverInstrumentFiles =
2488       Args.getAllArgValues(OPT_fxray_never_instrument);
2489 
2490   // -fallow-editor-placeholders
2491   Opts.AllowEditorPlaceholders = Args.hasArg(OPT_fallow_editor_placeholders);
2492 }
2493 
2494 static bool isStrictlyPreprocessorAction(frontend::ActionKind Action) {
2495   switch (Action) {
2496   case frontend::ASTDeclList:
2497   case frontend::ASTDump:
2498   case frontend::ASTPrint:
2499   case frontend::ASTView:
2500   case frontend::EmitAssembly:
2501   case frontend::EmitBC:
2502   case frontend::EmitHTML:
2503   case frontend::EmitLLVM:
2504   case frontend::EmitLLVMOnly:
2505   case frontend::EmitCodeGenOnly:
2506   case frontend::EmitObj:
2507   case frontend::FixIt:
2508   case frontend::GenerateModule:
2509   case frontend::GenerateModuleInterface:
2510   case frontend::GeneratePCH:
2511   case frontend::GeneratePTH:
2512   case frontend::ParseSyntaxOnly:
2513   case frontend::ModuleFileInfo:
2514   case frontend::VerifyPCH:
2515   case frontend::PluginAction:
2516   case frontend::PrintDeclContext:
2517   case frontend::RewriteObjC:
2518   case frontend::RewriteTest:
2519   case frontend::RunAnalysis:
2520   case frontend::MigrateSource:
2521     return false;
2522 
2523   case frontend::DumpRawTokens:
2524   case frontend::DumpTokens:
2525   case frontend::InitOnly:
2526   case frontend::PrintPreamble:
2527   case frontend::PrintPreprocessedInput:
2528   case frontend::RewriteMacros:
2529   case frontend::RunPreprocessorOnly:
2530     return true;
2531   }
2532   llvm_unreachable("invalid frontend action");
2533 }
2534 
2535 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2536                                   FileManager &FileMgr,
2537                                   DiagnosticsEngine &Diags,
2538                                   frontend::ActionKind Action) {
2539   using namespace options;
2540   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2541   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2542   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2543       Opts.TokenCache = A->getValue();
2544   else
2545     Opts.TokenCache = Opts.ImplicitPTHInclude;
2546   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2547   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2548   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2549   Opts.AllowPCHWithCompilerErrors = Args.hasArg(OPT_fallow_pch_with_errors);
2550 
2551   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2552   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2553     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2554 
2555   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2556     StringRef Value(A->getValue());
2557     size_t Comma = Value.find(',');
2558     unsigned Bytes = 0;
2559     unsigned EndOfLine = 0;
2560 
2561     if (Comma == StringRef::npos ||
2562         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2563         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2564       Diags.Report(diag::err_drv_preamble_format);
2565     else {
2566       Opts.PrecompiledPreambleBytes.first = Bytes;
2567       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2568     }
2569   }
2570 
2571   // Add macros from the command line.
2572   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2573     if (A->getOption().matches(OPT_D))
2574       Opts.addMacroDef(A->getValue());
2575     else
2576       Opts.addMacroUndef(A->getValue());
2577   }
2578 
2579   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2580 
2581   // Add the ordered list of -includes.
2582   for (const Arg *A : Args.filtered(OPT_include))
2583     Opts.Includes.emplace_back(A->getValue());
2584 
2585   for (const Arg *A : Args.filtered(OPT_chain_include))
2586     Opts.ChainedIncludes.emplace_back(A->getValue());
2587 
2588   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2589     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2590 
2591     if (Split.second.empty()) {
2592       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2593       continue;
2594     }
2595 
2596     Opts.addRemappedFile(Split.first, Split.second);
2597   }
2598 
2599   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2600     StringRef Name = A->getValue();
2601     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2602       .Case("libc++", ARCXX_libcxx)
2603       .Case("libstdc++", ARCXX_libstdcxx)
2604       .Case("none", ARCXX_nolib)
2605       .Default(~0U);
2606     if (Library == ~0U)
2607       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2608     else
2609       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2610   }
2611 
2612   // Always avoid lexing editor placeholders when we're just running the
2613   // preprocessor as we never want to emit the
2614   // "editor placeholder in source file" error in PP only mode.
2615   if (isStrictlyPreprocessorAction(Action))
2616     Opts.LexEditorPlaceholders = false;
2617 }
2618 
2619 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2620                                         ArgList &Args,
2621                                         frontend::ActionKind Action) {
2622   using namespace options;
2623 
2624   if (isStrictlyPreprocessorAction(Action))
2625     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2626   else
2627     Opts.ShowCPP = 0;
2628 
2629   Opts.ShowComments = Args.hasArg(OPT_C);
2630   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2631   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2632   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2633   Opts.ShowIncludeDirectives = Args.hasArg(OPT_dI);
2634   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2635   Opts.RewriteImports = Args.hasArg(OPT_frewrite_imports);
2636   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2637 }
2638 
2639 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2640                             DiagnosticsEngine &Diags) {
2641   using namespace options;
2642   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2643   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2644     StringRef Value = A->getValue();
2645     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2646                                  .Case("default", llvm::EABI::Default)
2647                                  .Case("4", llvm::EABI::EABI4)
2648                                  .Case("5", llvm::EABI::EABI5)
2649                                  .Case("gnu", llvm::EABI::GNU)
2650                                  .Default(llvm::EABI::Unknown);
2651     if (EABIVersion == llvm::EABI::Unknown)
2652       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2653                                                 << Value;
2654     else
2655       Opts.EABIVersion = EABIVersion;
2656   }
2657   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2658   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2659   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2660   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2661   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2662   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2663   // Use the default target triple if unspecified.
2664   if (Opts.Triple.empty())
2665     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2666   Opts.OpenCLExtensionsAsWritten = Args.getAllArgValues(OPT_cl_ext_EQ);
2667 }
2668 
2669 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2670                                         const char *const *ArgBegin,
2671                                         const char *const *ArgEnd,
2672                                         DiagnosticsEngine &Diags) {
2673   bool Success = true;
2674 
2675   // Parse the arguments.
2676   std::unique_ptr<OptTable> Opts = createDriverOptTable();
2677   const unsigned IncludedFlagsBitmask = options::CC1Option;
2678   unsigned MissingArgIndex, MissingArgCount;
2679   InputArgList Args =
2680       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2681                       MissingArgCount, IncludedFlagsBitmask);
2682   LangOptions &LangOpts = *Res.getLangOpts();
2683 
2684   // Check for missing argument error.
2685   if (MissingArgCount) {
2686     Diags.Report(diag::err_drv_missing_argument)
2687         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2688     Success = false;
2689   }
2690 
2691   // Issue errors on unknown arguments.
2692   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2693     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2694     Success = false;
2695   }
2696 
2697   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2698   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2699   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2700   Success &=
2701       ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2702                           false /*DefaultDiagColor*/, false /*DefaultShowOpt*/);
2703   ParseCommentArgs(LangOpts.CommentOpts, Args);
2704   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2705   // FIXME: We shouldn't have to pass the DashX option around here
2706   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
2707                                       LangOpts.IsHeaderFile);
2708   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2709   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2710                               Res.getTargetOpts());
2711   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args,
2712                         Res.getFileSystemOpts().WorkingDir);
2713   if (DashX.getFormat() == InputKind::Precompiled ||
2714       DashX.getLanguage() == InputKind::LLVM_IR) {
2715     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2716     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2717     // what the input type is.
2718     if (Args.hasArg(OPT_fobjc_arc))
2719       LangOpts.ObjCAutoRefCount = 1;
2720     // PIClevel and PIELevel are needed during code generation and this should be
2721     // set regardless of the input type.
2722     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2723     LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
2724     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2725                         Diags, LangOpts.Sanitize);
2726   } else {
2727     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2728     // FIXME: Should we really be calling this for an InputKind::Asm input?
2729     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
2730                   Res.getPreprocessorOpts(), Diags);
2731     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2732       LangOpts.ObjCExceptions = 1;
2733   }
2734 
2735   if (LangOpts.CUDA) {
2736     // During CUDA device-side compilation, the aux triple is the
2737     // triple used for host compilation.
2738     if (LangOpts.CUDAIsDevice)
2739       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2740   }
2741 
2742   // Set the triple of the host for OpenMP device compile.
2743   if (LangOpts.OpenMPIsDevice)
2744     Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2745 
2746   // FIXME: Override value name discarding when asan or msan is used because the
2747   // backend passes depend on the name of the alloca in order to print out
2748   // names.
2749   Res.getCodeGenOpts().DiscardValueNames &=
2750       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2751       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2752 
2753   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2754   // PCH file and find the original header name. Remove the need to do that in
2755   // ParsePreprocessorArgs and remove the FileManager
2756   // parameters from the function and the "FileManager.h" #include.
2757   FileManager FileMgr(Res.getFileSystemOpts());
2758   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags,
2759                         Res.getFrontendOpts().ProgramAction);
2760   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2761                               Res.getFrontendOpts().ProgramAction);
2762 
2763   // Turn on -Wspir-compat for SPIR target.
2764   llvm::Triple T(Res.getTargetOpts().Triple);
2765   auto Arch = T.getArch();
2766   if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) {
2767     Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
2768   }
2769 
2770   // If sanitizer is enabled, disable OPT_ffine_grained_bitfield_accesses.
2771   if (Res.getCodeGenOpts().FineGrainedBitfieldAccesses &&
2772       !Res.getLangOpts()->Sanitize.empty()) {
2773     Res.getCodeGenOpts().FineGrainedBitfieldAccesses = false;
2774     Diags.Report(diag::warn_drv_fine_grained_bitfield_accesses_ignored);
2775   }
2776   return Success;
2777 }
2778 
2779 std::string CompilerInvocation::getModuleHash() const {
2780   // Note: For QoI reasons, the things we use as a hash here should all be
2781   // dumped via the -module-info flag.
2782   using llvm::hash_code;
2783   using llvm::hash_value;
2784   using llvm::hash_combine;
2785 
2786   // Start the signature with the compiler version.
2787   // FIXME: We'd rather use something more cryptographically sound than
2788   // CityHash, but this will do for now.
2789   hash_code code = hash_value(getClangFullRepositoryVersion());
2790 
2791   // Extend the signature with the language options
2792 #define LANGOPT(Name, Bits, Default, Description) \
2793    code = hash_combine(code, LangOpts->Name);
2794 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2795   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2796 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2797 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2798 #include "clang/Basic/LangOptions.def"
2799 
2800   for (StringRef Feature : LangOpts->ModuleFeatures)
2801     code = hash_combine(code, Feature);
2802 
2803   // Extend the signature with the target options.
2804   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2805                       TargetOpts->ABI);
2806   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2807     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2808 
2809   // Extend the signature with preprocessor options.
2810   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2811   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2812   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2813 
2814   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2815             I = getPreprocessorOpts().Macros.begin(),
2816          IEnd = getPreprocessorOpts().Macros.end();
2817        I != IEnd; ++I) {
2818     // If we're supposed to ignore this macro for the purposes of modules,
2819     // don't put it into the hash.
2820     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2821       // Check whether we're ignoring this macro.
2822       StringRef MacroDef = I->first;
2823       if (hsOpts.ModulesIgnoreMacros.count(
2824               llvm::CachedHashString(MacroDef.split('=').first)))
2825         continue;
2826     }
2827 
2828     code = hash_combine(code, I->first, I->second);
2829   }
2830 
2831   // Extend the signature with the sysroot and other header search options.
2832   code = hash_combine(code, hsOpts.Sysroot,
2833                       hsOpts.ModuleFormat,
2834                       hsOpts.UseDebugInfo,
2835                       hsOpts.UseBuiltinIncludes,
2836                       hsOpts.UseStandardSystemIncludes,
2837                       hsOpts.UseStandardCXXIncludes,
2838                       hsOpts.UseLibcxx,
2839                       hsOpts.ModulesValidateDiagnosticOptions);
2840   code = hash_combine(code, hsOpts.ResourceDir);
2841 
2842   // Extend the signature with the user build path.
2843   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2844 
2845   // Extend the signature with the module file extensions.
2846   const FrontendOptions &frontendOpts = getFrontendOpts();
2847   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2848     code = ext->hashExtension(code);
2849   }
2850 
2851   // Extend the signature with the enabled sanitizers, if at least one is
2852   // enabled. Sanitizers which cannot affect AST generation aren't hashed.
2853   SanitizerSet SanHash = LangOpts->Sanitize;
2854   SanHash.clear(getPPTransparentSanitizers());
2855   if (!SanHash.empty())
2856     code = hash_combine(code, SanHash.Mask);
2857 
2858   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2859 }
2860 
2861 namespace clang {
2862 
2863 template<typename IntTy>
2864 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2865                                     IntTy Default,
2866                                     DiagnosticsEngine *Diags) {
2867   IntTy Res = Default;
2868   if (Arg *A = Args.getLastArg(Id)) {
2869     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2870       if (Diags)
2871         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2872                                                        << A->getValue();
2873     }
2874   }
2875   return Res;
2876 }
2877 
2878 
2879 // Declared in clang/Frontend/Utils.h.
2880 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2881                        DiagnosticsEngine *Diags) {
2882   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2883 }
2884 
2885 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2886                                uint64_t Default,
2887                                DiagnosticsEngine *Diags) {
2888   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2889 }
2890 
2891 void BuryPointer(const void *Ptr) {
2892   // This function may be called only a small fixed amount of times per each
2893   // invocation, otherwise we do actually have a leak which we want to report.
2894   // If this function is called more than kGraveYardMaxSize times, the pointers
2895   // will not be properly buried and a leak detector will report a leak, which
2896   // is what we want in such case.
2897   static const size_t kGraveYardMaxSize = 16;
2898   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2899   static std::atomic<unsigned> GraveYardSize;
2900   unsigned Idx = GraveYardSize++;
2901   if (Idx >= kGraveYardMaxSize)
2902     return;
2903   GraveYard[Idx] = Ptr;
2904 }
2905 
2906 IntrusiveRefCntPtr<vfs::FileSystem>
2907 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2908                                 DiagnosticsEngine &Diags) {
2909   return createVFSFromCompilerInvocation(CI, Diags, vfs::getRealFileSystem());
2910 }
2911 
2912 IntrusiveRefCntPtr<vfs::FileSystem>
2913 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2914                                 DiagnosticsEngine &Diags,
2915                                 IntrusiveRefCntPtr<vfs::FileSystem> BaseFS) {
2916   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2917     return BaseFS;
2918 
2919   IntrusiveRefCntPtr<vfs::OverlayFileSystem> Overlay(
2920       new vfs::OverlayFileSystem(BaseFS));
2921   // earlier vfs files are on the bottom
2922   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2923     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2924         BaseFS->getBufferForFile(File);
2925     if (!Buffer) {
2926       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2927       return IntrusiveRefCntPtr<vfs::FileSystem>();
2928     }
2929 
2930     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2931         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2932     if (!FS.get()) {
2933       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2934       return IntrusiveRefCntPtr<vfs::FileSystem>();
2935     }
2936     Overlay->pushOverlay(FS);
2937   }
2938   return Overlay;
2939 }
2940 } // end namespace clang
2941