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 "TestModuleFileExtension.h"
11 #include "clang/Basic/Builtins.h"
12 #include "clang/Basic/FileManager.h"
13 #include "clang/Basic/Version.h"
14 #include "clang/Config/config.h"
15 #include "clang/Driver/DriverDiagnostic.h"
16 #include "clang/Driver/Options.h"
17 #include "clang/Driver/Util.h"
18 #include "clang/Frontend/CompilerInvocation.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/Serialization/ASTReader.h"
24 #include "clang/Serialization/ModuleFileExtension.h"
25 #include "llvm/ADT/Hashing.h"
26 #include "llvm/ADT/STLExtras.h"
27 #include "llvm/ADT/SmallVector.h"
28 #include "llvm/ADT/StringExtras.h"
29 #include "llvm/ADT/StringSwitch.h"
30 #include "llvm/ADT/Triple.h"
31 #include "llvm/Linker/Linker.h"
32 #include "llvm/Option/Arg.h"
33 #include "llvm/Option/ArgList.h"
34 #include "llvm/Option/OptTable.h"
35 #include "llvm/Option/Option.h"
36 #include "llvm/ProfileData/InstrProfReader.h"
37 #include "llvm/Support/CodeGen.h"
38 #include "llvm/Support/ErrorHandling.h"
39 #include "llvm/Support/FileSystem.h"
40 #include "llvm/Support/Host.h"
41 #include "llvm/Support/Path.h"
42 #include "llvm/Support/Process.h"
43 #include "llvm/Target/TargetOptions.h"
44 #include <atomic>
45 #include <memory>
46 #include <sys/stat.h>
47 #include <system_error>
48 using namespace clang;
49 
50 //===----------------------------------------------------------------------===//
51 // Initialization.
52 //===----------------------------------------------------------------------===//
53 
54 CompilerInvocationBase::CompilerInvocationBase()
55   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
56     DiagnosticOpts(new DiagnosticOptions()),
57     HeaderSearchOpts(new HeaderSearchOptions()),
58     PreprocessorOpts(new PreprocessorOptions()) {}
59 
60 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
61   : RefCountedBase<CompilerInvocation>(),
62     LangOpts(new LangOptions(*X.getLangOpts())),
63     TargetOpts(new TargetOptions(X.getTargetOpts())),
64     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
65     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
66     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
67 
68 CompilerInvocationBase::~CompilerInvocationBase() {}
69 
70 //===----------------------------------------------------------------------===//
71 // Deserialization (from args)
72 //===----------------------------------------------------------------------===//
73 
74 using namespace clang::driver;
75 using namespace clang::driver::options;
76 using namespace llvm::opt;
77 
78 //
79 
80 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
81                                      DiagnosticsEngine &Diags) {
82   unsigned DefaultOpt = 0;
83   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
84     DefaultOpt = 2;
85 
86   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
87     if (A->getOption().matches(options::OPT_O0))
88       return 0;
89 
90     if (A->getOption().matches(options::OPT_Ofast))
91       return 3;
92 
93     assert (A->getOption().matches(options::OPT_O));
94 
95     StringRef S(A->getValue());
96     if (S == "s" || S == "z" || S.empty())
97       return 2;
98 
99     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
100   }
101 
102   return DefaultOpt;
103 }
104 
105 static unsigned getOptimizationLevelSize(ArgList &Args) {
106   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
107     if (A->getOption().matches(options::OPT_O)) {
108       switch (A->getValue()[0]) {
109       default:
110         return 0;
111       case 's':
112         return 1;
113       case 'z':
114         return 2;
115       }
116     }
117   }
118   return 0;
119 }
120 
121 static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
122                               OptSpecifier GroupWithValue,
123                               std::vector<std::string> &Diagnostics) {
124   for (Arg *A : Args.filtered(Group)) {
125     if (A->getOption().getKind() == Option::FlagClass) {
126       // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
127       // its name (minus the "W" or "R" at the beginning) to the warning list.
128       Diagnostics.push_back(A->getOption().getName().drop_front(1));
129     } else if (A->getOption().matches(GroupWithValue)) {
130       // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
131       Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
132     } else {
133       // Otherwise, add its value (for OPT_W_Joined and similar).
134       for (const char *Arg : A->getValues())
135         Diagnostics.emplace_back(Arg);
136     }
137   }
138 }
139 
140 static void getAllNoBuiltinFuncValues(ArgList &Args,
141                                       std::vector<std::string> &Funcs) {
142   SmallVector<const char *, 8> Values;
143   for (const auto &Arg : Args) {
144     const Option &O = Arg->getOption();
145     if (O.matches(options::OPT_fno_builtin_)) {
146       const char *FuncName = Arg->getValue();
147       if (Builtin::Context::isBuiltinFunc(FuncName))
148         Values.push_back(FuncName);
149     }
150   }
151   Funcs.insert(Funcs.end(), Values.begin(), Values.end());
152 }
153 
154 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
155                               DiagnosticsEngine &Diags) {
156   using namespace options;
157   bool Success = true;
158   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
159     StringRef Name = A->getValue();
160     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
161 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
162       .Case(CMDFLAG, NAME##Model)
163 #include "clang/StaticAnalyzer/Core/Analyses.def"
164       .Default(NumStores);
165     if (Value == NumStores) {
166       Diags.Report(diag::err_drv_invalid_value)
167         << A->getAsString(Args) << Name;
168       Success = false;
169     } else {
170       Opts.AnalysisStoreOpt = Value;
171     }
172   }
173 
174   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
175     StringRef Name = A->getValue();
176     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
177 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
178       .Case(CMDFLAG, NAME##Model)
179 #include "clang/StaticAnalyzer/Core/Analyses.def"
180       .Default(NumConstraints);
181     if (Value == NumConstraints) {
182       Diags.Report(diag::err_drv_invalid_value)
183         << A->getAsString(Args) << Name;
184       Success = false;
185     } else {
186       Opts.AnalysisConstraintsOpt = Value;
187     }
188   }
189 
190   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
191     StringRef Name = A->getValue();
192     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
193 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
194       .Case(CMDFLAG, PD_##NAME)
195 #include "clang/StaticAnalyzer/Core/Analyses.def"
196       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
197     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
198       Diags.Report(diag::err_drv_invalid_value)
199         << A->getAsString(Args) << Name;
200       Success = false;
201     } else {
202       Opts.AnalysisDiagOpt = Value;
203     }
204   }
205 
206   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
207     StringRef Name = A->getValue();
208     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
209 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
210       .Case(CMDFLAG, NAME)
211 #include "clang/StaticAnalyzer/Core/Analyses.def"
212       .Default(NumPurgeModes);
213     if (Value == NumPurgeModes) {
214       Diags.Report(diag::err_drv_invalid_value)
215         << A->getAsString(Args) << Name;
216       Success = false;
217     } else {
218       Opts.AnalysisPurgeOpt = Value;
219     }
220   }
221 
222   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
223     StringRef Name = A->getValue();
224     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
225 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
226       .Case(CMDFLAG, NAME)
227 #include "clang/StaticAnalyzer/Core/Analyses.def"
228       .Default(NumInliningModes);
229     if (Value == NumInliningModes) {
230       Diags.Report(diag::err_drv_invalid_value)
231         << A->getAsString(Args) << Name;
232       Success = false;
233     } else {
234       Opts.InliningMode = Value;
235     }
236   }
237 
238   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
239   Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
240 
241   Opts.visualizeExplodedGraphWithGraphViz =
242     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
243   Opts.visualizeExplodedGraphWithUbiGraph =
244     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
245   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
246   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
247   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
248   Opts.AnalyzeNestedBlocks =
249     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
250   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
251   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
252   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
253   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
254   Opts.maxBlockVisitOnPath =
255       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
256   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
257   Opts.InlineMaxStackDepth =
258       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
259                          Opts.InlineMaxStackDepth, Diags);
260 
261   Opts.CheckersControlList.clear();
262   for (const Arg *A :
263        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
264     A->claim();
265     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
266     // We can have a list of comma separated checker names, e.g:
267     // '-analyzer-checker=cocoa,unix'
268     StringRef checkerList = A->getValue();
269     SmallVector<StringRef, 4> checkers;
270     checkerList.split(checkers, ",");
271     for (StringRef checker : checkers)
272       Opts.CheckersControlList.emplace_back(checker, enable);
273   }
274 
275   // Go through the analyzer configuration options.
276   for (const Arg *A : Args.filtered(OPT_analyzer_config)) {
277     A->claim();
278     // We can have a list of comma separated config names, e.g:
279     // '-analyzer-config key1=val1,key2=val2'
280     StringRef configList = A->getValue();
281     SmallVector<StringRef, 4> configVals;
282     configList.split(configVals, ",");
283     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
284       StringRef key, val;
285       std::tie(key, val) = configVals[i].split("=");
286       if (val.empty()) {
287         Diags.Report(SourceLocation(),
288                      diag::err_analyzer_config_no_value) << configVals[i];
289         Success = false;
290         break;
291       }
292       if (val.find('=') != StringRef::npos) {
293         Diags.Report(SourceLocation(),
294                      diag::err_analyzer_config_multiple_values)
295           << configVals[i];
296         Success = false;
297         break;
298       }
299       Opts.Config[key] = val;
300     }
301   }
302 
303   return Success;
304 }
305 
306 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
307   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
308   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
309   return true;
310 }
311 
312 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
313   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
314   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
315 }
316 
317 static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
318   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
319     StringRef Value = A->getValue();
320     if (Value == "small" || Value == "kernel" || Value == "medium" ||
321         Value == "large")
322       return Value;
323     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
324   }
325   return "default";
326 }
327 
328 /// \brief Create a new Regex instance out of the string value in \p RpassArg.
329 /// It returns a pointer to the newly generated Regex instance.
330 static std::shared_ptr<llvm::Regex>
331 GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
332                                 Arg *RpassArg) {
333   StringRef Val = RpassArg->getValue();
334   std::string RegexError;
335   std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
336   if (!Pattern->isValid(RegexError)) {
337     Diags.Report(diag::err_drv_optimization_remark_pattern)
338         << RegexError << RpassArg->getAsString(Args);
339     Pattern.reset();
340   }
341   return Pattern;
342 }
343 
344 static bool parseDiagnosticLevelMask(StringRef FlagName,
345                                      const std::vector<std::string> &Levels,
346                                      DiagnosticsEngine *Diags,
347                                      DiagnosticLevelMask &M) {
348   bool Success = true;
349   for (const auto &Level : Levels) {
350     DiagnosticLevelMask const PM =
351       llvm::StringSwitch<DiagnosticLevelMask>(Level)
352         .Case("note",    DiagnosticLevelMask::Note)
353         .Case("remark",  DiagnosticLevelMask::Remark)
354         .Case("warning", DiagnosticLevelMask::Warning)
355         .Case("error",   DiagnosticLevelMask::Error)
356         .Default(DiagnosticLevelMask::None);
357     if (PM == DiagnosticLevelMask::None) {
358       Success = false;
359       if (Diags)
360         Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
361     }
362     M = M | PM;
363   }
364   return Success;
365 }
366 
367 static void parseSanitizerKinds(StringRef FlagName,
368                                 const std::vector<std::string> &Sanitizers,
369                                 DiagnosticsEngine &Diags, SanitizerSet &S) {
370   for (const auto &Sanitizer : Sanitizers) {
371     SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
372     if (K == 0)
373       Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
374     else
375       S.set(K, true);
376   }
377 }
378 
379 // Set the profile kind for fprofile-instrument.
380 static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
381                                DiagnosticsEngine &Diags) {
382   Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
383   if (A == nullptr)
384     return;
385   StringRef S = A->getValue();
386   unsigned I = llvm::StringSwitch<unsigned>(S)
387                    .Case("none", CodeGenOptions::ProfileNone)
388                    .Case("clang", CodeGenOptions::ProfileClangInstr)
389                    .Case("llvm", CodeGenOptions::ProfileIRInstr)
390                    .Default(~0U);
391   if (I == ~0U) {
392     Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
393                                                          << S;
394     return;
395   }
396   CodeGenOptions::ProfileInstrKind Instrumentor =
397       static_cast<CodeGenOptions::ProfileInstrKind>(I);
398   Opts.setProfileInstr(Instrumentor);
399 }
400 
401 // Set the profile kind using fprofile-instrument-use-path.
402 static void setPGOUseInstrumentor(CodeGenOptions &Opts,
403                                   const Twine &ProfileName) {
404   auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
405   // In error, return silently and let Clang PGOUse report the error message.
406   if (auto E = ReaderOrErr.takeError()) {
407     llvm::consumeError(std::move(E));
408     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
409     return;
410   }
411   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
412     std::move(ReaderOrErr.get());
413   if (PGOReader->isIRLevelProfile())
414     Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
415   else
416     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
417 }
418 
419 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
420                              DiagnosticsEngine &Diags,
421                              const TargetOptions &TargetOpts) {
422   using namespace options;
423   bool Success = true;
424   llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
425 
426   unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
427   // TODO: This could be done in Driver
428   unsigned MaxOptLevel = 3;
429   if (OptimizationLevel > MaxOptLevel) {
430     // If the optimization level is not supported, fall back on the default
431     // optimization
432     Diags.Report(diag::warn_drv_optimization_value)
433         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
434     OptimizationLevel = MaxOptLevel;
435   }
436   Opts.OptimizationLevel = OptimizationLevel;
437 
438   // We must always run at least the always inlining pass.
439   Opts.setInlining(
440     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
441                                  : CodeGenOptions::OnlyAlwaysInlining);
442   // -fno-inline-functions overrides OptimizationLevel > 1.
443   Opts.NoInline = Args.hasArg(OPT_fno_inline);
444   if (Arg* InlineArg = Args.getLastArg(options::OPT_finline_functions,
445                                        options::OPT_fno_inline_functions)) {
446     Opts.setInlining(
447       InlineArg->getOption().matches(options::OPT_finline_functions) ?
448         CodeGenOptions::NormalInlining : CodeGenOptions::OnlyAlwaysInlining);
449   }
450 
451   if (Arg *A = Args.getLastArg(OPT_fveclib)) {
452     StringRef Name = A->getValue();
453     if (Name == "Accelerate")
454       Opts.setVecLib(CodeGenOptions::Accelerate);
455     else if (Name == "none")
456       Opts.setVecLib(CodeGenOptions::NoLibrary);
457     else
458       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
459   }
460 
461   if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
462     unsigned Val =
463         llvm::StringSwitch<unsigned>(A->getValue())
464             .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
465             .Case("limited", codegenoptions::LimitedDebugInfo)
466             .Case("standalone", codegenoptions::FullDebugInfo)
467             .Default(~0U);
468     if (Val == ~0U)
469       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
470                                                 << A->getValue();
471     else
472       Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
473   }
474   if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
475     unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
476                        .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
477                        .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
478                        .Case("sce", unsigned(llvm::DebuggerKind::SCE))
479                        .Default(~0U);
480     if (Val == ~0U)
481       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
482                                                 << A->getValue();
483     else
484       Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
485   }
486   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
487   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
488   Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
489   Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
490   Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
491   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
492   Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
493   Opts.DebugExplicitImport = Triple.isPS4CPU();
494 
495   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
496     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
497 
498   if (const Arg *A =
499           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
500     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
501 
502   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
503   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
504   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
505   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
506   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
507     OPT_fuse_register_sized_bitfield_access);
508   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
509   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
510   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
511   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
512   Opts.NoCommon = Args.hasArg(OPT_fno_common);
513   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
514   Opts.OptimizeSize = getOptimizationLevelSize(Args);
515   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
516                             Args.hasArg(OPT_ffreestanding));
517   if (Opts.SimplifyLibCalls)
518     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
519   Opts.UnrollLoops =
520       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
521                    (Opts.OptimizationLevel > 1));
522   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
523 
524   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
525   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
526   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
527 
528   setPGOInstrumentor(Opts, Args, Diags);
529   Opts.InstrProfileOutput =
530       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
531   Opts.ProfileInstrumentUsePath =
532       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
533   if (!Opts.ProfileInstrumentUsePath.empty())
534     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
535 
536   Opts.CoverageMapping =
537       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
538   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
539   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
540   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
541   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
542   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
543   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
544   Opts.CodeModel = getCodeModel(Args, Diags);
545   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
546   Opts.DisableFPElim =
547       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
548   Opts.DisableFree = Args.hasArg(OPT_disable_free);
549   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
550   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
551   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
552   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
553   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
554   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
555                        Args.hasArg(OPT_cl_finite_math_only) ||
556                        Args.hasArg(OPT_cl_fast_relaxed_math));
557   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
558                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
559                        Args.hasArg(OPT_cl_finite_math_only) ||
560                        Args.hasArg(OPT_cl_fast_relaxed_math));
561   Opts.NoSignedZeros = Args.hasArg(OPT_fno_signed_zeros);
562   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
563   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
564   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
565   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
566   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
567   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
568   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
569   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
570   Opts.IncrementalLinkerCompatible =
571       Args.hasArg(OPT_mincremental_linker_compatible);
572   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
573   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
574   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
575   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
576   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
577   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
578   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
579                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
580                       Args.hasArg(OPT_cl_fast_relaxed_math);
581   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
582   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
583   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
584   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
585     Diags.Report(diag::err_drv_invalid_value)
586         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
587         << Opts.ThreadModel;
588   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
589   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
590 
591   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
592                                        OPT_fno_function_sections, false);
593   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
594                                    OPT_fno_data_sections, false);
595   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
596                                          OPT_fno_unique_section_names, true);
597 
598   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
599 
600   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
601 
602   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
603   const Arg *A = Args.getLastArg(OPT_flto, OPT_flto_EQ);
604   Opts.EmitSummaryIndex = A && A->containsValue("thin");
605   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
606     if (IK != IK_LLVM_IR)
607       Diags.Report(diag::err_drv_argument_only_allowed_with)
608           << A->getAsString(Args) << "-x ir";
609     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
610   }
611 
612   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
613 
614   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
615   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
616   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
617 
618   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
619   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
620 
621   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
622   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
623   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
624   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
625     Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
626     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
627     Opts.CoverageNoFunctionNamesInData =
628         Args.hasArg(OPT_coverage_no_function_names_in_data);
629     Opts.CoverageExitBlockBeforeBody =
630         Args.hasArg(OPT_coverage_exit_block_before_body);
631     if (Args.hasArg(OPT_coverage_version_EQ)) {
632       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
633       if (CoverageVersion.size() != 4) {
634         Diags.Report(diag::err_drv_invalid_value)
635             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
636             << CoverageVersion;
637       } else {
638         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
639       }
640     }
641   }
642 	// Handle -fembed-bitcode option.
643   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
644     StringRef Name = A->getValue();
645     unsigned Model = llvm::StringSwitch<unsigned>(Name)
646         .Case("off", CodeGenOptions::Embed_Off)
647         .Case("all", CodeGenOptions::Embed_All)
648         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
649         .Case("marker", CodeGenOptions::Embed_Marker)
650         .Default(~0U);
651     if (Model == ~0U) {
652       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
653       Success = false;
654     } else
655       Opts.setEmbedBitcode(
656           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
657   }
658   // FIXME: For backend options that are not yet recorded as function
659   // attributes in the IR, keep track of them so we can embed them in a
660   // separate data section and use them when building the bitcode.
661   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
662     for (const auto &A : Args) {
663       // Do not encode output and input.
664       if (A->getOption().getID() == options::OPT_o ||
665           A->getOption().getID() == options::OPT_INPUT ||
666           A->getOption().getID() == options::OPT_x ||
667           A->getOption().getID() == options::OPT_fembed_bitcode ||
668           (A->getOption().getGroup().isValid() &&
669            A->getOption().getGroup().getID() == options::OPT_W_Group))
670         continue;
671       ArgStringList ASL;
672       A->render(Args, ASL);
673       for (const auto &arg : ASL) {
674         StringRef ArgStr(arg);
675         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
676         // using \00 to seperate each commandline options.
677         Opts.CmdArgs.push_back('\0');
678       }
679     }
680   }
681 
682   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
683   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
684   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
685   Opts.CompressDebugSections = Args.hasArg(OPT_compress_debug_sections);
686   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
687   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
688   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
689     unsigned LinkFlags = llvm::Linker::Flags::None;
690     if (A->getOption().matches(OPT_mlink_cuda_bitcode))
691       LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded |
692                   llvm::Linker::Flags::InternalizeLinkedSymbols;
693     Opts.LinkBitcodeFiles.push_back(std::make_pair(LinkFlags, A->getValue()));
694   }
695   Opts.SanitizeCoverageType =
696       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
697   Opts.SanitizeCoverageIndirectCalls =
698       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
699   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
700   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
701   Opts.SanitizeCoverage8bitCounters =
702       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
703   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
704   Opts.SanitizeMemoryTrackOrigins =
705       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
706   Opts.SanitizeMemoryUseAfterDtor =
707       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
708   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
709   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
710   Opts.SanitizeAddressUseAfterScope =
711       Args.hasArg(OPT_fsanitize_address_use_after_scope);
712   Opts.SSPBufferSize =
713       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
714   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
715   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
716     StringRef Val = A->getValue();
717     unsigned StackAlignment = Opts.StackAlignment;
718     Val.getAsInteger(10, StackAlignment);
719     Opts.StackAlignment = StackAlignment;
720   }
721 
722   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
723     StringRef Val = A->getValue();
724     unsigned StackProbeSize = Opts.StackProbeSize;
725     Val.getAsInteger(0, StackProbeSize);
726     Opts.StackProbeSize = StackProbeSize;
727   }
728 
729   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
730     StringRef Name = A->getValue();
731     unsigned Method = llvm::StringSwitch<unsigned>(Name)
732       .Case("legacy", CodeGenOptions::Legacy)
733       .Case("non-legacy", CodeGenOptions::NonLegacy)
734       .Case("mixed", CodeGenOptions::Mixed)
735       .Default(~0U);
736     if (Method == ~0U) {
737       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
738       Success = false;
739     } else {
740       Opts.setObjCDispatchMethod(
741         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
742     }
743   }
744 
745   Opts.EmulatedTLS =
746       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
747 
748   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
749     StringRef Name = A->getValue();
750     unsigned Model = llvm::StringSwitch<unsigned>(Name)
751         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
752         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
753         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
754         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
755         .Default(~0U);
756     if (Model == ~0U) {
757       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
758       Success = false;
759     } else {
760       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
761     }
762   }
763 
764   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
765     StringRef Val = A->getValue();
766     if (Val == "fast")
767       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
768     else if (Val == "on")
769       Opts.setFPContractMode(CodeGenOptions::FPC_On);
770     else if (Val == "off")
771       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
772     else
773       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
774   }
775 
776   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
777     if (A->getOption().matches(OPT_fpcc_struct_return)) {
778       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
779     } else {
780       assert(A->getOption().matches(OPT_freg_struct_return));
781       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
782     }
783   }
784 
785   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
786   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
787   bool NeedLocTracking = false;
788 
789   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
790     Opts.OptimizationRemarkPattern =
791         GenerateOptimizationRemarkRegex(Diags, Args, A);
792     NeedLocTracking = true;
793   }
794 
795   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
796     Opts.OptimizationRemarkMissedPattern =
797         GenerateOptimizationRemarkRegex(Diags, Args, A);
798     NeedLocTracking = true;
799   }
800 
801   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
802     Opts.OptimizationRemarkAnalysisPattern =
803         GenerateOptimizationRemarkRegex(Diags, Args, A);
804     NeedLocTracking = true;
805   }
806 
807   // If the user requested to use a sample profile for PGO, then the
808   // backend will need to track source location information so the profile
809   // can be incorporated into the IR.
810   if (!Opts.SampleProfileFile.empty())
811     NeedLocTracking = true;
812 
813   // If the user requested a flag that requires source locations available in
814   // the backend, make sure that the backend tracks source location information.
815   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
816     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
817 
818   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
819 
820   // Parse -fsanitize-recover= arguments.
821   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
822   parseSanitizerKinds("-fsanitize-recover=",
823                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
824                       Opts.SanitizeRecover);
825   parseSanitizerKinds("-fsanitize-trap=",
826                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
827                       Opts.SanitizeTrap);
828 
829   Opts.CudaGpuBinaryFileNames =
830       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
831 
832   Opts.Backchain = Args.hasArg(OPT_mbackchain);
833 
834   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
835       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
836 
837   return Success;
838 }
839 
840 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
841                                       ArgList &Args) {
842   using namespace options;
843   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
844   Opts.Targets = Args.getAllArgValues(OPT_MT);
845   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
846   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
847   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
848   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
849   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
850   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
851   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
852   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
853   Opts.ModuleDependencyOutputDir =
854       Args.getLastArgValue(OPT_module_dependency_dir);
855   if (Args.hasArg(OPT_MV))
856     Opts.OutputFormat = DependencyOutputFormat::NMake;
857   // Add sanitizer blacklists as extra dependencies.
858   // They won't be discovered by the regular preprocessor, so
859   // we let make / ninja to know about this implicit dependency.
860   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
861   auto ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
862   Opts.ExtraDeps.insert(Opts.ExtraDeps.end(), ModuleFiles.begin(),
863                         ModuleFiles.end());
864 }
865 
866 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
867   // Color diagnostics default to auto ("on" if terminal supports) in the driver
868   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
869   // Support both clang's -f[no-]color-diagnostics and gcc's
870   // -f[no-]diagnostics-colors[=never|always|auto].
871   enum {
872     Colors_On,
873     Colors_Off,
874     Colors_Auto
875   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
876   for (Arg *A : Args) {
877     const Option &O = A->getOption();
878     if (!O.matches(options::OPT_fcolor_diagnostics) &&
879         !O.matches(options::OPT_fdiagnostics_color) &&
880         !O.matches(options::OPT_fno_color_diagnostics) &&
881         !O.matches(options::OPT_fno_diagnostics_color) &&
882         !O.matches(options::OPT_fdiagnostics_color_EQ))
883       continue;
884 
885     if (O.matches(options::OPT_fcolor_diagnostics) ||
886         O.matches(options::OPT_fdiagnostics_color)) {
887       ShowColors = Colors_On;
888     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
889                O.matches(options::OPT_fno_diagnostics_color)) {
890       ShowColors = Colors_Off;
891     } else {
892       assert(O.matches(options::OPT_fdiagnostics_color_EQ));
893       StringRef Value(A->getValue());
894       if (Value == "always")
895         ShowColors = Colors_On;
896       else if (Value == "never")
897         ShowColors = Colors_Off;
898       else if (Value == "auto")
899         ShowColors = Colors_Auto;
900     }
901   }
902   if (ShowColors == Colors_On ||
903       (ShowColors == Colors_Auto && llvm::sys::Process::StandardErrHasColors()))
904     return true;
905   return false;
906 }
907 
908 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
909                                 DiagnosticsEngine *Diags,
910                                 bool DefaultDiagColor) {
911   using namespace options;
912   bool Success = true;
913 
914   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
915   if (Arg *A =
916           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
917     Opts.DiagnosticSerializationFile = A->getValue();
918   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
919   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
920   Opts.Pedantic = Args.hasArg(OPT_pedantic);
921   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
922   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
923   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
924   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
925                                  OPT_fno_show_column,
926                                  /*Default=*/true);
927   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
928   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
929   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
930 
931   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
932 
933   // Default behavior is to not to show note include stacks.
934   Opts.ShowNoteIncludeStack = false;
935   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
936                                OPT_fno_diagnostics_show_note_include_stack))
937     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
938       Opts.ShowNoteIncludeStack = true;
939 
940   StringRef ShowOverloads =
941     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
942   if (ShowOverloads == "best")
943     Opts.setShowOverloads(Ovl_Best);
944   else if (ShowOverloads == "all")
945     Opts.setShowOverloads(Ovl_All);
946   else {
947     Success = false;
948     if (Diags)
949       Diags->Report(diag::err_drv_invalid_value)
950       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
951       << ShowOverloads;
952   }
953 
954   StringRef ShowCategory =
955     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
956   if (ShowCategory == "none")
957     Opts.ShowCategories = 0;
958   else if (ShowCategory == "id")
959     Opts.ShowCategories = 1;
960   else if (ShowCategory == "name")
961     Opts.ShowCategories = 2;
962   else {
963     Success = false;
964     if (Diags)
965       Diags->Report(diag::err_drv_invalid_value)
966       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
967       << ShowCategory;
968   }
969 
970   StringRef Format =
971     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
972   if (Format == "clang")
973     Opts.setFormat(DiagnosticOptions::Clang);
974   else if (Format == "msvc")
975     Opts.setFormat(DiagnosticOptions::MSVC);
976   else if (Format == "msvc-fallback") {
977     Opts.setFormat(DiagnosticOptions::MSVC);
978     Opts.CLFallbackMode = true;
979   } else if (Format == "vi")
980     Opts.setFormat(DiagnosticOptions::Vi);
981   else {
982     Success = false;
983     if (Diags)
984       Diags->Report(diag::err_drv_invalid_value)
985       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
986       << Format;
987   }
988 
989   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
990   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
991   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
992   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
993   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
994   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
995     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
996     Diags, DiagMask);
997   if (Args.hasArg(OPT_verify_ignore_unexpected))
998     DiagMask = DiagnosticLevelMask::All;
999   Opts.setVerifyIgnoreUnexpected(DiagMask);
1000   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1001   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1002   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1003   Opts.MacroBacktraceLimit =
1004       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1005                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1006   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1007       Args, OPT_ftemplate_backtrace_limit,
1008       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1009   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1010       Args, OPT_fconstexpr_backtrace_limit,
1011       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1012   Opts.SpellCheckingLimit = getLastArgIntValue(
1013       Args, OPT_fspell_checking_limit,
1014       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1015   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1016                                     DiagnosticOptions::DefaultTabStop, Diags);
1017   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1018     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1019     if (Diags)
1020       Diags->Report(diag::warn_ignoring_ftabstop_value)
1021       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1022   }
1023   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1024   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1025   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1026 
1027   return Success;
1028 }
1029 
1030 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1031   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1032 }
1033 
1034 /// Parse the argument to the -ftest-module-file-extension
1035 /// command-line argument.
1036 ///
1037 /// \returns true on error, false on success.
1038 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1039                                             std::string &BlockName,
1040                                             unsigned &MajorVersion,
1041                                             unsigned &MinorVersion,
1042                                             bool &Hashed,
1043                                             std::string &UserInfo) {
1044   SmallVector<StringRef, 5> Args;
1045   Arg.split(Args, ':', 5);
1046   if (Args.size() < 5)
1047     return true;
1048 
1049   BlockName = Args[0];
1050   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1051   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1052   if (Args[3].getAsInteger(2, Hashed)) return true;
1053   if (Args.size() > 4)
1054     UserInfo = Args[4];
1055   return false;
1056 }
1057 
1058 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1059                                    DiagnosticsEngine &Diags) {
1060   using namespace options;
1061   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1062   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1063     switch (A->getOption().getID()) {
1064     default:
1065       llvm_unreachable("Invalid option in group!");
1066     case OPT_ast_list:
1067       Opts.ProgramAction = frontend::ASTDeclList; break;
1068     case OPT_ast_dump:
1069     case OPT_ast_dump_lookups:
1070       Opts.ProgramAction = frontend::ASTDump; break;
1071     case OPT_ast_print:
1072       Opts.ProgramAction = frontend::ASTPrint; break;
1073     case OPT_ast_view:
1074       Opts.ProgramAction = frontend::ASTView; break;
1075     case OPT_dump_raw_tokens:
1076       Opts.ProgramAction = frontend::DumpRawTokens; break;
1077     case OPT_dump_tokens:
1078       Opts.ProgramAction = frontend::DumpTokens; break;
1079     case OPT_S:
1080       Opts.ProgramAction = frontend::EmitAssembly; break;
1081     case OPT_emit_llvm_bc:
1082       Opts.ProgramAction = frontend::EmitBC; break;
1083     case OPT_emit_html:
1084       Opts.ProgramAction = frontend::EmitHTML; break;
1085     case OPT_emit_llvm:
1086       Opts.ProgramAction = frontend::EmitLLVM; break;
1087     case OPT_emit_llvm_only:
1088       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1089     case OPT_emit_codegen_only:
1090       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1091     case OPT_emit_obj:
1092       Opts.ProgramAction = frontend::EmitObj; break;
1093     case OPT_fixit_EQ:
1094       Opts.FixItSuffix = A->getValue();
1095       // fall-through!
1096     case OPT_fixit:
1097       Opts.ProgramAction = frontend::FixIt; break;
1098     case OPT_emit_module:
1099       Opts.ProgramAction = frontend::GenerateModule; break;
1100     case OPT_emit_pch:
1101       Opts.ProgramAction = frontend::GeneratePCH; break;
1102     case OPT_emit_pth:
1103       Opts.ProgramAction = frontend::GeneratePTH; break;
1104     case OPT_init_only:
1105       Opts.ProgramAction = frontend::InitOnly; break;
1106     case OPT_fsyntax_only:
1107       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1108     case OPT_module_file_info:
1109       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1110     case OPT_verify_pch:
1111       Opts.ProgramAction = frontend::VerifyPCH; break;
1112     case OPT_print_decl_contexts:
1113       Opts.ProgramAction = frontend::PrintDeclContext; break;
1114     case OPT_print_preamble:
1115       Opts.ProgramAction = frontend::PrintPreamble; break;
1116     case OPT_E:
1117       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1118     case OPT_rewrite_macros:
1119       Opts.ProgramAction = frontend::RewriteMacros; break;
1120     case OPT_rewrite_objc:
1121       Opts.ProgramAction = frontend::RewriteObjC; break;
1122     case OPT_rewrite_test:
1123       Opts.ProgramAction = frontend::RewriteTest; break;
1124     case OPT_analyze:
1125       Opts.ProgramAction = frontend::RunAnalysis; break;
1126     case OPT_migrate:
1127       Opts.ProgramAction = frontend::MigrateSource; break;
1128     case OPT_Eonly:
1129       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1130     }
1131   }
1132 
1133   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1134     Opts.Plugins.emplace_back(A->getValue(0));
1135     Opts.ProgramAction = frontend::PluginAction;
1136     Opts.ActionName = A->getValue();
1137   }
1138   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1139   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1140     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1141 
1142   for (const std::string &Arg :
1143          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1144     std::string BlockName;
1145     unsigned MajorVersion;
1146     unsigned MinorVersion;
1147     bool Hashed;
1148     std::string UserInfo;
1149     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1150                                         MinorVersion, Hashed, UserInfo)) {
1151       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1152 
1153       continue;
1154     }
1155 
1156     // Add the testing module file extension.
1157     Opts.ModuleFileExtensions.push_back(
1158       new TestModuleFileExtension(BlockName, MajorVersion, MinorVersion,
1159                                   Hashed, UserInfo));
1160   }
1161 
1162   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1163     Opts.CodeCompletionAt =
1164       ParsedSourceLocation::FromString(A->getValue());
1165     if (Opts.CodeCompletionAt.FileName.empty())
1166       Diags.Report(diag::err_drv_invalid_value)
1167         << A->getAsString(Args) << A->getValue();
1168   }
1169   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1170 
1171   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1172   Opts.Plugins = Args.getAllArgValues(OPT_load);
1173   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1174   Opts.ShowHelp = Args.hasArg(OPT_help);
1175   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1176   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1177   Opts.ShowVersion = Args.hasArg(OPT_version);
1178   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1179   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1180   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1181   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1182   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1183   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1184   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1185   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1186   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1187   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1188   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1189   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1190   Opts.ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
1191   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1192   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1193 
1194   Opts.CodeCompleteOpts.IncludeMacros
1195     = Args.hasArg(OPT_code_completion_macros);
1196   Opts.CodeCompleteOpts.IncludeCodePatterns
1197     = Args.hasArg(OPT_code_completion_patterns);
1198   Opts.CodeCompleteOpts.IncludeGlobals
1199     = !Args.hasArg(OPT_no_code_completion_globals);
1200   Opts.CodeCompleteOpts.IncludeBriefComments
1201     = Args.hasArg(OPT_code_completion_brief_comments);
1202 
1203   Opts.OverrideRecordLayoutsFile
1204     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1205   Opts.AuxTriple =
1206       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1207   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1208 
1209   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1210                                      OPT_arcmt_modify,
1211                                      OPT_arcmt_migrate)) {
1212     switch (A->getOption().getID()) {
1213     default:
1214       llvm_unreachable("missed a case");
1215     case OPT_arcmt_check:
1216       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1217       break;
1218     case OPT_arcmt_modify:
1219       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1220       break;
1221     case OPT_arcmt_migrate:
1222       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1223       break;
1224     }
1225   }
1226   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1227   Opts.ARCMTMigrateReportOut
1228     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1229   Opts.ARCMTMigrateEmitARCErrors
1230     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1231 
1232   if (Args.hasArg(OPT_objcmt_migrate_literals))
1233     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1234   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1235     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1236   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1237     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1238   if (Args.hasArg(OPT_objcmt_migrate_property))
1239     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1240   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1241     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1242   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1243     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1244   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1245     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1246   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1247     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1248   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1249     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1250   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1251     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1252   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1253     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1254   if (Args.hasArg(OPT_objcmt_atomic_property))
1255     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1256   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1257     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1258   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1259     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1260   if (Args.hasArg(OPT_objcmt_migrate_all))
1261     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1262 
1263   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1264 
1265   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1266       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1267     Diags.Report(diag::err_drv_argument_not_allowed_with)
1268       << "ARC migration" << "ObjC migration";
1269   }
1270 
1271   InputKind DashX = IK_None;
1272   if (const Arg *A = Args.getLastArg(OPT_x)) {
1273     DashX = llvm::StringSwitch<InputKind>(A->getValue())
1274       .Case("c", IK_C)
1275       .Case("cl", IK_OpenCL)
1276       .Case("cuda", IK_CUDA)
1277       .Case("c++", IK_CXX)
1278       .Case("objective-c", IK_ObjC)
1279       .Case("objective-c++", IK_ObjCXX)
1280       .Case("cpp-output", IK_PreprocessedC)
1281       .Case("assembler-with-cpp", IK_Asm)
1282       .Case("c++-cpp-output", IK_PreprocessedCXX)
1283       .Case("cuda-cpp-output", IK_PreprocessedCuda)
1284       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
1285       .Case("objc-cpp-output", IK_PreprocessedObjC)
1286       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
1287       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
1288       .Case("c-header", IK_C)
1289       .Case("cl-header", IK_OpenCL)
1290       .Case("objective-c-header", IK_ObjC)
1291       .Case("c++-header", IK_CXX)
1292       .Case("objective-c++-header", IK_ObjCXX)
1293       .Cases("ast", "pcm", IK_AST)
1294       .Case("ir", IK_LLVM_IR)
1295       .Default(IK_None);
1296     if (DashX == IK_None)
1297       Diags.Report(diag::err_drv_invalid_value)
1298         << A->getAsString(Args) << A->getValue();
1299   }
1300 
1301   // '-' is the default input if none is given.
1302   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1303   Opts.Inputs.clear();
1304   if (Inputs.empty())
1305     Inputs.push_back("-");
1306   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1307     InputKind IK = DashX;
1308     if (IK == IK_None) {
1309       IK = FrontendOptions::getInputKindForExtension(
1310         StringRef(Inputs[i]).rsplit('.').second);
1311       // FIXME: Remove this hack.
1312       if (i == 0)
1313         DashX = IK;
1314     }
1315     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1316   }
1317 
1318   return DashX;
1319 }
1320 
1321 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1322                                                  void *MainAddr) {
1323   std::string ClangExecutable =
1324       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1325   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1326 
1327   // Compute the path to the resource directory.
1328   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1329   SmallString<128> P(Dir);
1330   if (ClangResourceDir != "")
1331     llvm::sys::path::append(P, ClangResourceDir);
1332   else
1333     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1334                             "clang", CLANG_VERSION_STRING);
1335 
1336   return P.str();
1337 }
1338 
1339 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
1340   using namespace options;
1341   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1342   Opts.Verbose = Args.hasArg(OPT_v);
1343   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1344   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1345   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1346   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1347     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1348   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1349   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
1350   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1351   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1352   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1353   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1354   Opts.ModuleCachePruneInterval =
1355       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1356   Opts.ModuleCachePruneAfter =
1357       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1358   Opts.ModulesValidateOncePerBuildSession =
1359       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1360   Opts.BuildSessionTimestamp =
1361       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1362   Opts.ModulesValidateSystemHeaders =
1363       Args.hasArg(OPT_fmodules_validate_system_headers);
1364   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1365     Opts.ModuleFormat = A->getValue();
1366 
1367   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1368     StringRef MacroDef = A->getValue();
1369     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
1370   }
1371 
1372   // Add -I..., -F..., and -index-header-map options in order.
1373   bool IsIndexHeaderMap = false;
1374   bool IsSysrootSpecified =
1375       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1376   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1377     if (A->getOption().matches(OPT_index_header_map)) {
1378       // -index-header-map applies to the next -I or -F.
1379       IsIndexHeaderMap = true;
1380       continue;
1381     }
1382 
1383     frontend::IncludeDirGroup Group =
1384         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1385 
1386     bool IsFramework = A->getOption().matches(OPT_F);
1387     std::string Path = A->getValue();
1388 
1389     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1390       SmallString<32> Buffer;
1391       llvm::sys::path::append(Buffer, Opts.Sysroot,
1392                               llvm::StringRef(A->getValue()).substr(1));
1393       Path = Buffer.str();
1394     }
1395 
1396     Opts.AddPath(Path.c_str(), Group, IsFramework,
1397                  /*IgnoreSysroot*/ true);
1398     IsIndexHeaderMap = false;
1399   }
1400 
1401   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1402   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1403   for (const Arg *A :
1404        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1405     if (A->getOption().matches(OPT_iprefix))
1406       Prefix = A->getValue();
1407     else if (A->getOption().matches(OPT_iwithprefix))
1408       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1409     else
1410       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1411   }
1412 
1413   for (const Arg *A : Args.filtered(OPT_idirafter))
1414     Opts.AddPath(A->getValue(), frontend::After, false, true);
1415   for (const Arg *A : Args.filtered(OPT_iquote))
1416     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1417   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1418     Opts.AddPath(A->getValue(), frontend::System, false,
1419                  !A->getOption().matches(OPT_iwithsysroot));
1420   for (const Arg *A : Args.filtered(OPT_iframework))
1421     Opts.AddPath(A->getValue(), frontend::System, true, true);
1422 
1423   // Add the paths for the various language specific isystem flags.
1424   for (const Arg *A : Args.filtered(OPT_c_isystem))
1425     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1426   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1427     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1428   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1429     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1430   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1431     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1432 
1433   // Add the internal paths from a driver that detects standard include paths.
1434   for (const Arg *A :
1435        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1436     frontend::IncludeDirGroup Group = frontend::System;
1437     if (A->getOption().matches(OPT_internal_externc_isystem))
1438       Group = frontend::ExternCSystem;
1439     Opts.AddPath(A->getValue(), Group, false, true);
1440   }
1441 
1442   // Add the path prefixes which are implicitly treated as being system headers.
1443   for (const Arg *A :
1444        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1445     Opts.AddSystemHeaderPrefix(
1446         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1447 
1448   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1449     Opts.AddVFSOverlayFile(A->getValue());
1450 }
1451 
1452 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1453                                          const llvm::Triple &T,
1454                                          LangStandard::Kind LangStd) {
1455   // Set some properties which depend solely on the input kind; it would be nice
1456   // to move these to the language standard, and have the driver resolve the
1457   // input kind + language standard.
1458   if (IK == IK_Asm) {
1459     Opts.AsmPreprocessor = 1;
1460   } else if (IK == IK_ObjC ||
1461              IK == IK_ObjCXX ||
1462              IK == IK_PreprocessedObjC ||
1463              IK == IK_PreprocessedObjCXX) {
1464     Opts.ObjC1 = Opts.ObjC2 = 1;
1465   }
1466 
1467   if (LangStd == LangStandard::lang_unspecified) {
1468     // Based on the base language, pick one.
1469     switch (IK) {
1470     case IK_None:
1471     case IK_AST:
1472     case IK_LLVM_IR:
1473       llvm_unreachable("Invalid input kind!");
1474     case IK_OpenCL:
1475       LangStd = LangStandard::lang_opencl;
1476       break;
1477     case IK_CUDA:
1478     case IK_PreprocessedCuda:
1479       LangStd = LangStandard::lang_cuda;
1480       break;
1481     case IK_Asm:
1482     case IK_C:
1483     case IK_PreprocessedC:
1484     case IK_ObjC:
1485     case IK_PreprocessedObjC:
1486       // The PS4 uses C99 as the default C standard.
1487       if (T.isPS4())
1488         LangStd = LangStandard::lang_gnu99;
1489       else
1490         LangStd = LangStandard::lang_gnu11;
1491       break;
1492     case IK_CXX:
1493     case IK_PreprocessedCXX:
1494     case IK_ObjCXX:
1495     case IK_PreprocessedObjCXX:
1496       LangStd = LangStandard::lang_gnucxx98;
1497       break;
1498     }
1499   }
1500 
1501   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1502   Opts.LineComment = Std.hasLineComments();
1503   Opts.C99 = Std.isC99();
1504   Opts.C11 = Std.isC11();
1505   Opts.CPlusPlus = Std.isCPlusPlus();
1506   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1507   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1508   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1509   Opts.Digraphs = Std.hasDigraphs();
1510   Opts.GNUMode = Std.isGNUMode();
1511   Opts.GNUInline = Std.isC89();
1512   Opts.HexFloats = Std.hasHexFloats();
1513   Opts.ImplicitInt = Std.hasImplicitInt();
1514 
1515   // Set OpenCL Version.
1516   Opts.OpenCL = LangStd == LangStandard::lang_opencl || IK == IK_OpenCL;
1517   if (LangStd == LangStandard::lang_opencl)
1518     Opts.OpenCLVersion = 100;
1519   else if (LangStd == LangStandard::lang_opencl11)
1520     Opts.OpenCLVersion = 110;
1521   else if (LangStd == LangStandard::lang_opencl12)
1522     Opts.OpenCLVersion = 120;
1523   else if (LangStd == LangStandard::lang_opencl20)
1524     Opts.OpenCLVersion = 200;
1525 
1526   // OpenCL has some additional defaults.
1527   if (Opts.OpenCL) {
1528     Opts.AltiVec = 0;
1529     Opts.ZVector = 0;
1530     Opts.CXXOperatorNames = 1;
1531     Opts.LaxVectorConversions = 0;
1532     Opts.DefaultFPContract = 1;
1533     Opts.NativeHalfType = 1;
1534     Opts.NativeHalfArgsAndReturns = 1;
1535   }
1536 
1537   Opts.CUDA = IK == IK_CUDA || IK == IK_PreprocessedCuda ||
1538               LangStd == LangStandard::lang_cuda;
1539 
1540   // OpenCL and C++ both have bool, true, false keywords.
1541   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1542 
1543   // OpenCL has half keyword
1544   Opts.Half = Opts.OpenCL;
1545 
1546   // C++ has wchar_t keyword.
1547   Opts.WChar = Opts.CPlusPlus;
1548 
1549   Opts.GNUKeywords = Opts.GNUMode;
1550   Opts.CXXOperatorNames = Opts.CPlusPlus;
1551 
1552   Opts.DollarIdents = !Opts.AsmPreprocessor;
1553 }
1554 
1555 /// Attempt to parse a visibility value out of the given argument.
1556 static Visibility parseVisibility(Arg *arg, ArgList &args,
1557                                   DiagnosticsEngine &diags) {
1558   StringRef value = arg->getValue();
1559   if (value == "default") {
1560     return DefaultVisibility;
1561   } else if (value == "hidden" || value == "internal") {
1562     return HiddenVisibility;
1563   } else if (value == "protected") {
1564     // FIXME: diagnose if target does not support protected visibility
1565     return ProtectedVisibility;
1566   }
1567 
1568   diags.Report(diag::err_drv_invalid_value)
1569     << arg->getAsString(args) << value;
1570   return DefaultVisibility;
1571 }
1572 
1573 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1574                           const TargetOptions &TargetOpts,
1575                           DiagnosticsEngine &Diags) {
1576   // FIXME: Cleanup per-file based stuff.
1577   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1578   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1579     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1580 #define LANGSTANDARD(id, name, desc, features) \
1581       .Case(name, LangStandard::lang_##id)
1582 #include "clang/Frontend/LangStandards.def"
1583       .Default(LangStandard::lang_unspecified);
1584     if (LangStd == LangStandard::lang_unspecified)
1585       Diags.Report(diag::err_drv_invalid_value)
1586         << A->getAsString(Args) << A->getValue();
1587     else {
1588       // Valid standard, check to make sure language and standard are
1589       // compatible.
1590       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1591       switch (IK) {
1592       case IK_C:
1593       case IK_ObjC:
1594       case IK_PreprocessedC:
1595       case IK_PreprocessedObjC:
1596         if (!(Std.isC89() || Std.isC99()))
1597           Diags.Report(diag::err_drv_argument_not_allowed_with)
1598             << A->getAsString(Args) << "C/ObjC";
1599         break;
1600       case IK_CXX:
1601       case IK_ObjCXX:
1602       case IK_PreprocessedCXX:
1603       case IK_PreprocessedObjCXX:
1604         if (!Std.isCPlusPlus())
1605           Diags.Report(diag::err_drv_argument_not_allowed_with)
1606             << A->getAsString(Args) << "C++/ObjC++";
1607         break;
1608       case IK_OpenCL:
1609         Diags.Report(diag::err_drv_argument_not_allowed_with)
1610           << A->getAsString(Args) << "OpenCL";
1611         break;
1612       case IK_CUDA:
1613       case IK_PreprocessedCuda:
1614         if (!Std.isCPlusPlus())
1615           Diags.Report(diag::err_drv_argument_not_allowed_with)
1616             << A->getAsString(Args) << "CUDA";
1617         break;
1618       default:
1619         break;
1620       }
1621     }
1622   }
1623 
1624   // -cl-std only applies for OpenCL language standards.
1625   // Override the -std option in this case.
1626   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1627     LangStandard::Kind OpenCLLangStd
1628     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1629     .Case("CL", LangStandard::lang_opencl)
1630     .Case("CL1.1", LangStandard::lang_opencl11)
1631     .Case("CL1.2", LangStandard::lang_opencl12)
1632     .Case("CL2.0", LangStandard::lang_opencl20)
1633     .Default(LangStandard::lang_unspecified);
1634 
1635     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1636       Diags.Report(diag::err_drv_invalid_value)
1637       << A->getAsString(Args) << A->getValue();
1638     }
1639     else
1640       LangStd = OpenCLLangStd;
1641   }
1642 
1643   llvm::Triple T(TargetOpts.Triple);
1644   CompilerInvocation::setLangDefaults(Opts, IK, T, LangStd);
1645 
1646   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1647   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1648   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1649   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1650   // name, as it doesn't seem a useful distinction.
1651   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1652                                   Opts.GNUKeywords);
1653 
1654   if (Args.hasArg(OPT_fno_operator_names))
1655     Opts.CXXOperatorNames = 0;
1656 
1657   if (Args.hasArg(OPT_fcuda_is_device))
1658     Opts.CUDAIsDevice = 1;
1659 
1660   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1661     Opts.CUDAAllowVariadicFunctions = 1;
1662 
1663   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1664     Opts.CUDAHostDeviceConstexpr = 0;
1665 
1666   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1667     Opts.CUDADeviceFlushDenormalsToZero = 1;
1668 
1669   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1670     Opts.CUDADeviceApproxTranscendentals = 1;
1671 
1672   if (Opts.ObjC1) {
1673     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1674       StringRef value = arg->getValue();
1675       if (Opts.ObjCRuntime.tryParse(value))
1676         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1677     }
1678 
1679     if (Args.hasArg(OPT_fobjc_gc_only))
1680       Opts.setGC(LangOptions::GCOnly);
1681     else if (Args.hasArg(OPT_fobjc_gc))
1682       Opts.setGC(LangOptions::HybridGC);
1683     else if (Args.hasArg(OPT_fobjc_arc)) {
1684       Opts.ObjCAutoRefCount = 1;
1685       if (!Opts.ObjCRuntime.allowsARC())
1686         Diags.Report(diag::err_arc_unsupported_on_runtime);
1687     }
1688 
1689     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
1690     // whether the feature is actually enabled.  This is predominantly
1691     // determined by -fobjc-runtime, but we allow it to be overridden
1692     // from the command line for testing purposes.
1693     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1694       Opts.ObjCWeakRuntime = 1;
1695     else
1696       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
1697 
1698     // ObjCWeak determines whether __weak is actually enabled.
1699     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
1700     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
1701       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
1702         assert(!Opts.ObjCWeak);
1703       } else if (Opts.getGC() != LangOptions::NonGC) {
1704         Diags.Report(diag::err_objc_weak_with_gc);
1705       } else if (!Opts.ObjCWeakRuntime) {
1706         Diags.Report(diag::err_objc_weak_unsupported);
1707       } else {
1708         Opts.ObjCWeak = 1;
1709       }
1710     } else if (Opts.ObjCAutoRefCount) {
1711       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
1712     }
1713 
1714     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1715       Opts.ObjCInferRelatedResultType = 0;
1716 
1717     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1718       Opts.ObjCSubscriptingLegacyRuntime =
1719         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1720   }
1721 
1722   if (Args.hasArg(OPT_fgnu89_inline)) {
1723     if (Opts.CPlusPlus)
1724       Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fgnu89-inline"
1725                                                             << "C++/ObjC++";
1726     else
1727       Opts.GNUInline = 1;
1728   }
1729 
1730   if (Args.hasArg(OPT_fapple_kext)) {
1731     if (!Opts.CPlusPlus)
1732       Diags.Report(diag::warn_c_kext);
1733     else
1734       Opts.AppleKext = 1;
1735   }
1736 
1737   if (Args.hasArg(OPT_print_ivar_layout))
1738     Opts.ObjCGCBitmapPrint = 1;
1739   if (Args.hasArg(OPT_fno_constant_cfstrings))
1740     Opts.NoConstantCFStrings = 1;
1741 
1742   if (Args.hasArg(OPT_faltivec))
1743     Opts.AltiVec = 1;
1744 
1745   if (Args.hasArg(OPT_fzvector))
1746     Opts.ZVector = 1;
1747 
1748   if (Args.hasArg(OPT_pthread))
1749     Opts.POSIXThreads = 1;
1750 
1751   // The value-visibility mode defaults to "default".
1752   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1753     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1754   } else {
1755     Opts.setValueVisibilityMode(DefaultVisibility);
1756   }
1757 
1758   // The type-visibility mode defaults to the value-visibility mode.
1759   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1760     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1761   } else {
1762     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1763   }
1764 
1765   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1766     Opts.InlineVisibilityHidden = 1;
1767 
1768   if (Args.hasArg(OPT_ftrapv)) {
1769     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1770     // Set the handler, if one is specified.
1771     Opts.OverflowHandler =
1772         Args.getLastArgValue(OPT_ftrapv_handler);
1773   }
1774   else if (Args.hasArg(OPT_fwrapv))
1775     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1776 
1777   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1778   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1779   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1780   Opts.MSCompatibilityVersion = 0;
1781   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
1782     VersionTuple VT;
1783     if (VT.tryParse(A->getValue()))
1784       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
1785                                                 << A->getValue();
1786     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
1787                                   VT.getMinor().getValueOr(0) * 100000 +
1788                                   VT.getSubminor().getValueOr(0);
1789   }
1790 
1791   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1792   // is specified, or -std is set to a conforming mode.
1793   // Trigraphs are disabled by default in c++1z onwards.
1794   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
1795   Opts.Trigraphs =
1796       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
1797 
1798   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1799                                    OPT_fno_dollars_in_identifiers,
1800                                    Opts.DollarIdents);
1801   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1802   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1803   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1804   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1805   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1806                                    Opts.ConstStrings);
1807   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1808     Opts.LaxVectorConversions = 0;
1809   if (Args.hasArg(OPT_fno_threadsafe_statics))
1810     Opts.ThreadsafeStatics = 0;
1811   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1812   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1813   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1814   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1815   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
1816   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1817 
1818   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
1819   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
1820   Opts.Blocks = Args.hasArg(OPT_fblocks);
1821   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1822   Opts.Coroutines = Args.hasArg(OPT_fcoroutines);
1823   Opts.Modules = Args.hasArg(OPT_fmodules);
1824   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
1825   Opts.ModulesDeclUse =
1826       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
1827   Opts.ModulesLocalVisibility =
1828       Args.hasArg(OPT_fmodules_local_submodule_visibility);
1829   Opts.ModulesSearchAll = Opts.Modules &&
1830     !Args.hasArg(OPT_fno_modules_search_all) &&
1831     Args.hasArg(OPT_fmodules_search_all);
1832   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
1833   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
1834   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1835   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1836   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1837   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1838   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1839   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1840   if (!Opts.NoBuiltin)
1841     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
1842   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1843   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1844   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
1845   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1846   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1847   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1848   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1849   Opts.InstantiationDepth =
1850       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1851   Opts.ArrowDepth =
1852       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1853   Opts.ConstexprCallDepth =
1854       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1855   Opts.ConstexprStepLimit =
1856       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1857   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1858   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1859   Opts.NumLargeByValueCopy =
1860       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1861   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1862   Opts.ObjCConstantStringClass =
1863     Args.getLastArgValue(OPT_fconstant_string_class);
1864   Opts.ObjCDefaultSynthProperties =
1865     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1866   Opts.EncodeExtendedBlockSig =
1867     Args.hasArg(OPT_fencode_extended_block_signature);
1868   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1869   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1870   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
1871   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
1872   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1873   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1874   Opts.Static = Args.hasArg(OPT_static_define);
1875   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1876   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1877                         || Args.hasArg(OPT_fdump_record_layouts);
1878   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1879   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1880   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1881   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1882   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1883   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1884   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1885   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1886   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1887   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1888   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1889   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1890   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
1891   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
1892   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
1893   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
1894   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
1895   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
1896   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
1897   // is enabled.
1898   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
1899                             | Opts.NativeHalfArgsAndReturns;
1900   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
1901 
1902   // __declspec is enabled by default for the PS4 by the driver, and also
1903   // enabled for Microsoft Extensions or Borland Extensions, here.
1904   //
1905   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
1906   // CUDA extension, however it is required for supporting cuda_builtin_vars.h,
1907   // which uses __declspec(property). Once that has been rewritten in terms of
1908   // something more generic, remove the Opts.CUDA term here.
1909   Opts.DeclSpecKeyword =
1910       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
1911                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
1912 
1913   // For now, we only support local submodule visibility in C++ (because we
1914   // heavily depend on the ODR for merging redefinitions).
1915   if (Opts.ModulesLocalVisibility && !Opts.CPlusPlus)
1916     Diags.Report(diag::err_drv_argument_not_allowed_with)
1917         << "-fmodules-local-submodule-visibility" << "C";
1918 
1919   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1920     switch (llvm::StringSwitch<unsigned>(A->getValue())
1921       .Case("target", LangOptions::ASMM_Target)
1922       .Case("no", LangOptions::ASMM_Off)
1923       .Case("yes", LangOptions::ASMM_On)
1924       .Default(255)) {
1925     default:
1926       Diags.Report(diag::err_drv_invalid_value)
1927         << "-faddress-space-map-mangling=" << A->getValue();
1928       break;
1929     case LangOptions::ASMM_Target:
1930       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1931       break;
1932     case LangOptions::ASMM_On:
1933       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1934       break;
1935     case LangOptions::ASMM_Off:
1936       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1937       break;
1938     }
1939   }
1940 
1941   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
1942     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
1943         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
1944             A->getValue())
1945             .Case("single",
1946                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
1947             .Case("multiple",
1948                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
1949             .Case("virtual",
1950                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
1951             .Default(LangOptions::PPTMK_BestCase);
1952     if (InheritanceModel == LangOptions::PPTMK_BestCase)
1953       Diags.Report(diag::err_drv_invalid_value)
1954           << "-fms-memptr-rep=" << A->getValue();
1955 
1956     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
1957   }
1958 
1959   // Check for MS default calling conventions being specified.
1960   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
1961     LangOptions::DefaultCallingConvention DefaultCC =
1962         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
1963             A->getValue())
1964             .Case("cdecl", LangOptions::DCC_CDecl)
1965             .Case("fastcall", LangOptions::DCC_FastCall)
1966             .Case("stdcall", LangOptions::DCC_StdCall)
1967             .Case("vectorcall", LangOptions::DCC_VectorCall)
1968             .Default(LangOptions::DCC_None);
1969     if (DefaultCC == LangOptions::DCC_None)
1970       Diags.Report(diag::err_drv_invalid_value)
1971           << "-fdefault-calling-conv=" << A->getValue();
1972 
1973     llvm::Triple T(TargetOpts.Triple);
1974     llvm::Triple::ArchType Arch = T.getArch();
1975     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
1976                   DefaultCC == LangOptions::DCC_StdCall) &&
1977                  Arch != llvm::Triple::x86;
1978     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
1979                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
1980     if (emitError)
1981       Diags.Report(diag::err_drv_argument_not_allowed_with)
1982           << A->getSpelling() << T.getTriple();
1983     else
1984       Opts.setDefaultCallingConv(DefaultCC);
1985   }
1986 
1987   // -mrtd option
1988   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
1989     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
1990       Diags.Report(diag::err_drv_argument_not_allowed_with)
1991           << A->getSpelling() << "-fdefault-calling-conv";
1992     else {
1993       llvm::Triple T(TargetOpts.Triple);
1994       if (T.getArch() != llvm::Triple::x86)
1995         Diags.Report(diag::err_drv_argument_not_allowed_with)
1996             << A->getSpelling() << T.getTriple();
1997       else
1998         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
1999     }
2000   }
2001 
2002   // Check if -fopenmp is specified.
2003   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2004   Opts.OpenMPUseTLS =
2005       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2006   Opts.OpenMPIsDevice =
2007       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2008 
2009   if (Opts.OpenMP) {
2010     int Version =
2011         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2012     if (Version != 0)
2013       Opts.OpenMP = Version;
2014     // Provide diagnostic when a given target is not expected to be an OpenMP
2015     // device or host.
2016     if (!Opts.OpenMPIsDevice) {
2017       switch (T.getArch()) {
2018       default:
2019         break;
2020       // Add unsupported host targets here:
2021       case llvm::Triple::nvptx:
2022       case llvm::Triple::nvptx64:
2023         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2024             << TargetOpts.Triple;
2025         break;
2026       }
2027     }
2028   }
2029 
2030   // Get the OpenMP target triples if any.
2031   if (Arg *A = Args.getLastArg(options::OPT_fomptargets_EQ)) {
2032 
2033     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2034       llvm::Triple TT(A->getValue(i));
2035 
2036       if (TT.getArch() == llvm::Triple::UnknownArch)
2037         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2038       else
2039         Opts.OMPTargetTriples.push_back(TT);
2040     }
2041   }
2042 
2043   // Get OpenMP host file path if any and report if a non existent file is
2044   // found
2045   if (Arg *A = Args.getLastArg(options::OPT_fomp_host_ir_file_path)) {
2046     Opts.OMPHostIRFile = A->getValue();
2047     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2048       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2049           << Opts.OMPHostIRFile;
2050   }
2051 
2052   // Record whether the __DEPRECATED define was requested.
2053   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2054                                  OPT_fno_deprecated_macro,
2055                                  Opts.Deprecated);
2056 
2057   // FIXME: Eliminate this dependency.
2058   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2059        OptSize = getOptimizationLevelSize(Args);
2060   Opts.Optimize = Opt != 0;
2061   Opts.OptimizeSize = OptSize != 0;
2062 
2063   // This is the __NO_INLINE__ define, which just depends on things like the
2064   // optimization level and -fno-inline, not actually whether the backend has
2065   // inlining enabled.
2066   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
2067 
2068   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2069       Args.hasArg(OPT_cl_fast_relaxed_math);
2070   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2071       Args.hasArg(OPT_cl_finite_math_only) ||
2072       Args.hasArg(OPT_cl_fast_relaxed_math);
2073   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2074                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2075                       Args.hasArg(OPT_cl_fast_relaxed_math);
2076 
2077   Opts.RetainCommentsFromSystemHeaders =
2078       Args.hasArg(OPT_fretain_comments_from_system_headers);
2079 
2080   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2081   switch (SSP) {
2082   default:
2083     Diags.Report(diag::err_drv_invalid_value)
2084       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2085     break;
2086   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2087   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2088   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2089   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2090   }
2091 
2092   // Parse -fsanitize= arguments.
2093   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2094                       Diags, Opts.Sanitize);
2095   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2096   Opts.SanitizeAddressFieldPadding =
2097       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2098   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2099 }
2100 
2101 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2102                                   FileManager &FileMgr,
2103                                   DiagnosticsEngine &Diags) {
2104   using namespace options;
2105   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2106   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2107   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2108       Opts.TokenCache = A->getValue();
2109   else
2110     Opts.TokenCache = Opts.ImplicitPTHInclude;
2111   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2112   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2113   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2114 
2115   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2116   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2117     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2118 
2119   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2120     StringRef Value(A->getValue());
2121     size_t Comma = Value.find(',');
2122     unsigned Bytes = 0;
2123     unsigned EndOfLine = 0;
2124 
2125     if (Comma == StringRef::npos ||
2126         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2127         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2128       Diags.Report(diag::err_drv_preamble_format);
2129     else {
2130       Opts.PrecompiledPreambleBytes.first = Bytes;
2131       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2132     }
2133   }
2134 
2135   // Add macros from the command line.
2136   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2137     if (A->getOption().matches(OPT_D))
2138       Opts.addMacroDef(A->getValue());
2139     else
2140       Opts.addMacroUndef(A->getValue());
2141   }
2142 
2143   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2144 
2145   // Add the ordered list of -includes.
2146   for (const Arg *A : Args.filtered(OPT_include))
2147     Opts.Includes.emplace_back(A->getValue());
2148 
2149   for (const Arg *A : Args.filtered(OPT_chain_include))
2150     Opts.ChainedIncludes.emplace_back(A->getValue());
2151 
2152   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2153     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2154 
2155     if (Split.second.empty()) {
2156       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2157       continue;
2158     }
2159 
2160     Opts.addRemappedFile(Split.first, Split.second);
2161   }
2162 
2163   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2164     StringRef Name = A->getValue();
2165     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2166       .Case("libc++", ARCXX_libcxx)
2167       .Case("libstdc++", ARCXX_libstdcxx)
2168       .Case("none", ARCXX_nolib)
2169       .Default(~0U);
2170     if (Library == ~0U)
2171       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2172     else
2173       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2174   }
2175 }
2176 
2177 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2178                                         ArgList &Args,
2179                                         frontend::ActionKind Action) {
2180   using namespace options;
2181 
2182   switch (Action) {
2183   case frontend::ASTDeclList:
2184   case frontend::ASTDump:
2185   case frontend::ASTPrint:
2186   case frontend::ASTView:
2187   case frontend::EmitAssembly:
2188   case frontend::EmitBC:
2189   case frontend::EmitHTML:
2190   case frontend::EmitLLVM:
2191   case frontend::EmitLLVMOnly:
2192   case frontend::EmitCodeGenOnly:
2193   case frontend::EmitObj:
2194   case frontend::FixIt:
2195   case frontend::GenerateModule:
2196   case frontend::GeneratePCH:
2197   case frontend::GeneratePTH:
2198   case frontend::ParseSyntaxOnly:
2199   case frontend::ModuleFileInfo:
2200   case frontend::VerifyPCH:
2201   case frontend::PluginAction:
2202   case frontend::PrintDeclContext:
2203   case frontend::RewriteObjC:
2204   case frontend::RewriteTest:
2205   case frontend::RunAnalysis:
2206   case frontend::MigrateSource:
2207     Opts.ShowCPP = 0;
2208     break;
2209 
2210   case frontend::DumpRawTokens:
2211   case frontend::DumpTokens:
2212   case frontend::InitOnly:
2213   case frontend::PrintPreamble:
2214   case frontend::PrintPreprocessedInput:
2215   case frontend::RewriteMacros:
2216   case frontend::RunPreprocessorOnly:
2217     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2218     break;
2219   }
2220 
2221   Opts.ShowComments = Args.hasArg(OPT_C);
2222   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2223   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2224   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2225   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2226   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2227 }
2228 
2229 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2230                             DiagnosticsEngine &Diags) {
2231   using namespace options;
2232   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2233   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2234     StringRef Value = A->getValue();
2235     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2236                                  .Case("default", llvm::EABI::Default)
2237                                  .Case("4", llvm::EABI::EABI4)
2238                                  .Case("5", llvm::EABI::EABI5)
2239                                  .Case("gnu", llvm::EABI::GNU)
2240                                  .Default(llvm::EABI::Unknown);
2241     if (EABIVersion == llvm::EABI::Unknown)
2242       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2243                                                 << Value;
2244     else
2245       Opts.EABIVersion = Value;
2246   }
2247   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2248   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2249   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2250   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2251   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2252   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2253   // Use the default target triple if unspecified.
2254   if (Opts.Triple.empty())
2255     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2256 }
2257 
2258 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2259                                         const char *const *ArgBegin,
2260                                         const char *const *ArgEnd,
2261                                         DiagnosticsEngine &Diags) {
2262   bool Success = true;
2263 
2264   // Parse the arguments.
2265   std::unique_ptr<OptTable> Opts(createDriverOptTable());
2266   const unsigned IncludedFlagsBitmask = options::CC1Option;
2267   unsigned MissingArgIndex, MissingArgCount;
2268   InputArgList Args =
2269       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2270                       MissingArgCount, IncludedFlagsBitmask);
2271   LangOptions &LangOpts = *Res.getLangOpts();
2272 
2273   // Check for missing argument error.
2274   if (MissingArgCount) {
2275     Diags.Report(diag::err_drv_missing_argument)
2276         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2277     Success = false;
2278   }
2279 
2280   // Issue errors on unknown arguments.
2281   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2282     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2283     Success = false;
2284   }
2285 
2286   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2287   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2288   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2289   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2290                                  false /*DefaultDiagColor*/);
2291   ParseCommentArgs(LangOpts.CommentOpts, Args);
2292   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2293   // FIXME: We shouldn't have to pass the DashX option around here
2294   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags);
2295   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2296   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2297                               Res.getTargetOpts());
2298   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args);
2299   if (DashX == IK_AST || DashX == IK_LLVM_IR) {
2300     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2301     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2302     // what the input type is.
2303     if (Args.hasArg(OPT_fobjc_arc))
2304       LangOpts.ObjCAutoRefCount = 1;
2305     // PIClevel and PIELevel are needed during code generation and this should be
2306     // set regardless of the input type.
2307     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2308     LangOpts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
2309     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2310                         Diags, LangOpts.Sanitize);
2311   } else {
2312     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2313     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(), Diags);
2314     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2315       LangOpts.ObjCExceptions = 1;
2316   }
2317 
2318   if (LangOpts.CUDA) {
2319     // During CUDA device-side compilation, the aux triple is the
2320     // triple used for host compilation.
2321     if (LangOpts.CUDAIsDevice)
2322       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2323 
2324     // Set default FP_CONTRACT to FAST.
2325     if (!Args.hasArg(OPT_ffp_contract))
2326       Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
2327   }
2328 
2329   // FIXME: Override value name discarding when asan or msan is used because the
2330   // backend passes depend on the name of the alloca in order to print out
2331   // names.
2332   Res.getCodeGenOpts().DiscardValueNames &=
2333       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2334       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2335 
2336   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2337   // PCH file and find the original header name. Remove the need to do that in
2338   // ParsePreprocessorArgs and remove the FileManager
2339   // parameters from the function and the "FileManager.h" #include.
2340   FileManager FileMgr(Res.getFileSystemOpts());
2341   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags);
2342   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2343                               Res.getFrontendOpts().ProgramAction);
2344   return Success;
2345 }
2346 
2347 namespace {
2348 
2349   class ModuleSignature {
2350     SmallVector<uint64_t, 16> Data;
2351     unsigned CurBit;
2352     uint64_t CurValue;
2353 
2354   public:
2355     ModuleSignature() : CurBit(0), CurValue(0) { }
2356 
2357     void add(uint64_t Value, unsigned Bits);
2358     void add(StringRef Value);
2359     void flush();
2360 
2361     llvm::APInt getAsInteger() const;
2362   };
2363 }
2364 
2365 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
2366   CurValue |= Value << CurBit;
2367   if (CurBit + NumBits < 64) {
2368     CurBit += NumBits;
2369     return;
2370   }
2371 
2372   // Add the current word.
2373   Data.push_back(CurValue);
2374 
2375   if (CurBit)
2376     CurValue = Value >> (64-CurBit);
2377   else
2378     CurValue = 0;
2379   CurBit = (CurBit+NumBits) & 63;
2380 }
2381 
2382 void ModuleSignature::flush() {
2383   if (CurBit == 0)
2384     return;
2385 
2386   Data.push_back(CurValue);
2387   CurBit = 0;
2388   CurValue = 0;
2389 }
2390 
2391 void ModuleSignature::add(StringRef Value) {
2392   for (auto &c : Value)
2393     add(c, 8);
2394 }
2395 
2396 llvm::APInt ModuleSignature::getAsInteger() const {
2397   return llvm::APInt(Data.size() * 64, Data);
2398 }
2399 
2400 std::string CompilerInvocation::getModuleHash() const {
2401   // Note: For QoI reasons, the things we use as a hash here should all be
2402   // dumped via the -module-info flag.
2403   using llvm::hash_code;
2404   using llvm::hash_value;
2405   using llvm::hash_combine;
2406 
2407   // Start the signature with the compiler version.
2408   // FIXME: We'd rather use something more cryptographically sound than
2409   // CityHash, but this will do for now.
2410   hash_code code = hash_value(getClangFullRepositoryVersion());
2411 
2412   // Extend the signature with the language options
2413 #define LANGOPT(Name, Bits, Default, Description) \
2414    code = hash_combine(code, LangOpts->Name);
2415 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2416   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2417 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2418 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2419 #include "clang/Basic/LangOptions.def"
2420 
2421   for (StringRef Feature : LangOpts->ModuleFeatures)
2422     code = hash_combine(code, Feature);
2423 
2424   // Extend the signature with the target options.
2425   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2426                       TargetOpts->ABI);
2427   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2428     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2429 
2430   // Extend the signature with preprocessor options.
2431   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2432   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2433   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2434 
2435   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2436             I = getPreprocessorOpts().Macros.begin(),
2437          IEnd = getPreprocessorOpts().Macros.end();
2438        I != IEnd; ++I) {
2439     // If we're supposed to ignore this macro for the purposes of modules,
2440     // don't put it into the hash.
2441     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2442       // Check whether we're ignoring this macro.
2443       StringRef MacroDef = I->first;
2444       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
2445         continue;
2446     }
2447 
2448     code = hash_combine(code, I->first, I->second);
2449   }
2450 
2451   // Extend the signature with the sysroot and other header search options.
2452   code = hash_combine(code, hsOpts.Sysroot,
2453                       hsOpts.ModuleFormat,
2454                       hsOpts.UseDebugInfo,
2455                       hsOpts.UseBuiltinIncludes,
2456                       hsOpts.UseStandardSystemIncludes,
2457                       hsOpts.UseStandardCXXIncludes,
2458                       hsOpts.UseLibcxx);
2459   code = hash_combine(code, hsOpts.ResourceDir);
2460 
2461   // Extend the signature with the user build path.
2462   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2463 
2464   // Extend the signature with the module file extensions.
2465   const FrontendOptions &frontendOpts = getFrontendOpts();
2466   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2467     code = ext->hashExtension(code);
2468   }
2469 
2470   // Darwin-specific hack: if we have a sysroot, use the contents and
2471   // modification time of
2472   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
2473   // as part of the module hash.
2474   if (!hsOpts.Sysroot.empty()) {
2475     SmallString<128> systemVersionFile;
2476     systemVersionFile += hsOpts.Sysroot;
2477     llvm::sys::path::append(systemVersionFile, "System");
2478     llvm::sys::path::append(systemVersionFile, "Library");
2479     llvm::sys::path::append(systemVersionFile, "CoreServices");
2480     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
2481 
2482     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer =
2483         llvm::MemoryBuffer::getFile(systemVersionFile);
2484     if (buffer) {
2485       code = hash_combine(code, buffer.get()->getBuffer());
2486 
2487       struct stat statBuf;
2488       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
2489         code = hash_combine(code, statBuf.st_mtime);
2490     }
2491   }
2492 
2493   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2494 }
2495 
2496 namespace clang {
2497 
2498 template<typename IntTy>
2499 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2500                                     IntTy Default,
2501                                     DiagnosticsEngine *Diags) {
2502   IntTy Res = Default;
2503   if (Arg *A = Args.getLastArg(Id)) {
2504     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2505       if (Diags)
2506         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2507                                                        << A->getValue();
2508     }
2509   }
2510   return Res;
2511 }
2512 
2513 
2514 // Declared in clang/Frontend/Utils.h.
2515 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2516                        DiagnosticsEngine *Diags) {
2517   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2518 }
2519 
2520 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2521                                uint64_t Default,
2522                                DiagnosticsEngine *Diags) {
2523   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2524 }
2525 
2526 void BuryPointer(const void *Ptr) {
2527   // This function may be called only a small fixed amount of times per each
2528   // invocation, otherwise we do actually have a leak which we want to report.
2529   // If this function is called more than kGraveYardMaxSize times, the pointers
2530   // will not be properly buried and a leak detector will report a leak, which
2531   // is what we want in such case.
2532   static const size_t kGraveYardMaxSize = 16;
2533   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2534   static std::atomic<unsigned> GraveYardSize;
2535   unsigned Idx = GraveYardSize++;
2536   if (Idx >= kGraveYardMaxSize)
2537     return;
2538   GraveYard[Idx] = Ptr;
2539 }
2540 
2541 IntrusiveRefCntPtr<vfs::FileSystem>
2542 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2543                                 DiagnosticsEngine &Diags) {
2544   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2545     return vfs::getRealFileSystem();
2546 
2547   IntrusiveRefCntPtr<vfs::OverlayFileSystem>
2548     Overlay(new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
2549   // earlier vfs files are on the bottom
2550   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2551     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2552         llvm::MemoryBuffer::getFile(File);
2553     if (!Buffer) {
2554       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2555       return IntrusiveRefCntPtr<vfs::FileSystem>();
2556     }
2557 
2558     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2559         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2560     if (!FS.get()) {
2561       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2562       return IntrusiveRefCntPtr<vfs::FileSystem>();
2563     }
2564     Overlay->pushOverlay(FS);
2565   }
2566   return Overlay;
2567 }
2568 } // end namespace clang
2569