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       .Case("renderscript", IK_RenderScript)
1296       .Default(IK_None);
1297     if (DashX == IK_None)
1298       Diags.Report(diag::err_drv_invalid_value)
1299         << A->getAsString(Args) << A->getValue();
1300   }
1301 
1302   // '-' is the default input if none is given.
1303   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1304   Opts.Inputs.clear();
1305   if (Inputs.empty())
1306     Inputs.push_back("-");
1307   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1308     InputKind IK = DashX;
1309     if (IK == IK_None) {
1310       IK = FrontendOptions::getInputKindForExtension(
1311         StringRef(Inputs[i]).rsplit('.').second);
1312       // FIXME: Remove this hack.
1313       if (i == 0)
1314         DashX = IK;
1315     }
1316     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1317   }
1318 
1319   return DashX;
1320 }
1321 
1322 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1323                                                  void *MainAddr) {
1324   std::string ClangExecutable =
1325       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1326   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1327 
1328   // Compute the path to the resource directory.
1329   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1330   SmallString<128> P(Dir);
1331   if (ClangResourceDir != "")
1332     llvm::sys::path::append(P, ClangResourceDir);
1333   else
1334     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1335                             "clang", CLANG_VERSION_STRING);
1336 
1337   return P.str();
1338 }
1339 
1340 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
1341   using namespace options;
1342   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1343   Opts.Verbose = Args.hasArg(OPT_v);
1344   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1345   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1346   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1347   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1348     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1349   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1350   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
1351   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1352   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1353   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1354   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1355   Opts.ModuleCachePruneInterval =
1356       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1357   Opts.ModuleCachePruneAfter =
1358       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1359   Opts.ModulesValidateOncePerBuildSession =
1360       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1361   Opts.BuildSessionTimestamp =
1362       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1363   Opts.ModulesValidateSystemHeaders =
1364       Args.hasArg(OPT_fmodules_validate_system_headers);
1365   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1366     Opts.ModuleFormat = A->getValue();
1367 
1368   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1369     StringRef MacroDef = A->getValue();
1370     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
1371   }
1372 
1373   // Add -I..., -F..., and -index-header-map options in order.
1374   bool IsIndexHeaderMap = false;
1375   bool IsSysrootSpecified =
1376       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1377   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1378     if (A->getOption().matches(OPT_index_header_map)) {
1379       // -index-header-map applies to the next -I or -F.
1380       IsIndexHeaderMap = true;
1381       continue;
1382     }
1383 
1384     frontend::IncludeDirGroup Group =
1385         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1386 
1387     bool IsFramework = A->getOption().matches(OPT_F);
1388     std::string Path = A->getValue();
1389 
1390     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1391       SmallString<32> Buffer;
1392       llvm::sys::path::append(Buffer, Opts.Sysroot,
1393                               llvm::StringRef(A->getValue()).substr(1));
1394       Path = Buffer.str();
1395     }
1396 
1397     Opts.AddPath(Path.c_str(), Group, IsFramework,
1398                  /*IgnoreSysroot*/ true);
1399     IsIndexHeaderMap = false;
1400   }
1401 
1402   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1403   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1404   for (const Arg *A :
1405        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1406     if (A->getOption().matches(OPT_iprefix))
1407       Prefix = A->getValue();
1408     else if (A->getOption().matches(OPT_iwithprefix))
1409       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1410     else
1411       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1412   }
1413 
1414   for (const Arg *A : Args.filtered(OPT_idirafter))
1415     Opts.AddPath(A->getValue(), frontend::After, false, true);
1416   for (const Arg *A : Args.filtered(OPT_iquote))
1417     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1418   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1419     Opts.AddPath(A->getValue(), frontend::System, false,
1420                  !A->getOption().matches(OPT_iwithsysroot));
1421   for (const Arg *A : Args.filtered(OPT_iframework))
1422     Opts.AddPath(A->getValue(), frontend::System, true, true);
1423 
1424   // Add the paths for the various language specific isystem flags.
1425   for (const Arg *A : Args.filtered(OPT_c_isystem))
1426     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1427   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1428     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1429   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1430     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1431   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1432     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1433 
1434   // Add the internal paths from a driver that detects standard include paths.
1435   for (const Arg *A :
1436        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1437     frontend::IncludeDirGroup Group = frontend::System;
1438     if (A->getOption().matches(OPT_internal_externc_isystem))
1439       Group = frontend::ExternCSystem;
1440     Opts.AddPath(A->getValue(), Group, false, true);
1441   }
1442 
1443   // Add the path prefixes which are implicitly treated as being system headers.
1444   for (const Arg *A :
1445        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1446     Opts.AddSystemHeaderPrefix(
1447         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1448 
1449   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1450     Opts.AddVFSOverlayFile(A->getValue());
1451 }
1452 
1453 bool isOpenCL(LangStandard::Kind LangStd) {
1454   return LangStd == LangStandard::lang_opencl
1455     || LangStd == LangStandard::lang_opencl11
1456     || LangStd == LangStandard::lang_opencl12
1457     || LangStd == LangStandard::lang_opencl20;
1458 }
1459 
1460 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1461                                          const llvm::Triple &T,
1462                                          PreprocessorOptions &PPOpts,
1463                                          LangStandard::Kind LangStd) {
1464   // Set some properties which depend solely on the input kind; it would be nice
1465   // to move these to the language standard, and have the driver resolve the
1466   // input kind + language standard.
1467   if (IK == IK_Asm) {
1468     Opts.AsmPreprocessor = 1;
1469   } else if (IK == IK_ObjC ||
1470              IK == IK_ObjCXX ||
1471              IK == IK_PreprocessedObjC ||
1472              IK == IK_PreprocessedObjCXX) {
1473     Opts.ObjC1 = Opts.ObjC2 = 1;
1474   }
1475 
1476   if (LangStd == LangStandard::lang_unspecified) {
1477     // Based on the base language, pick one.
1478     switch (IK) {
1479     case IK_None:
1480     case IK_AST:
1481     case IK_LLVM_IR:
1482       llvm_unreachable("Invalid input kind!");
1483     case IK_OpenCL:
1484       LangStd = LangStandard::lang_opencl;
1485       break;
1486     case IK_CUDA:
1487     case IK_PreprocessedCuda:
1488       LangStd = LangStandard::lang_cuda;
1489       break;
1490     case IK_Asm:
1491     case IK_C:
1492     case IK_PreprocessedC:
1493     case IK_ObjC:
1494     case IK_PreprocessedObjC:
1495       // The PS4 uses C99 as the default C standard.
1496       if (T.isPS4())
1497         LangStd = LangStandard::lang_gnu99;
1498       else
1499         LangStd = LangStandard::lang_gnu11;
1500       break;
1501     case IK_CXX:
1502     case IK_PreprocessedCXX:
1503     case IK_ObjCXX:
1504     case IK_PreprocessedObjCXX:
1505       LangStd = LangStandard::lang_gnucxx98;
1506       break;
1507     case IK_RenderScript:
1508       LangStd = LangStandard::lang_c99;
1509       break;
1510     }
1511   }
1512 
1513   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1514   Opts.LineComment = Std.hasLineComments();
1515   Opts.C99 = Std.isC99();
1516   Opts.C11 = Std.isC11();
1517   Opts.CPlusPlus = Std.isCPlusPlus();
1518   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1519   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1520   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1521   Opts.Digraphs = Std.hasDigraphs();
1522   Opts.GNUMode = Std.isGNUMode();
1523   Opts.GNUInline = Std.isC89();
1524   Opts.HexFloats = Std.hasHexFloats();
1525   Opts.ImplicitInt = Std.hasImplicitInt();
1526 
1527   // Set OpenCL Version.
1528   Opts.OpenCL = isOpenCL(LangStd) || IK == IK_OpenCL;
1529   if (LangStd == LangStandard::lang_opencl)
1530     Opts.OpenCLVersion = 100;
1531   else if (LangStd == LangStandard::lang_opencl11)
1532     Opts.OpenCLVersion = 110;
1533   else if (LangStd == LangStandard::lang_opencl12)
1534     Opts.OpenCLVersion = 120;
1535   else if (LangStd == LangStandard::lang_opencl20)
1536     Opts.OpenCLVersion = 200;
1537 
1538   // OpenCL has some additional defaults.
1539   if (Opts.OpenCL) {
1540     Opts.AltiVec = 0;
1541     Opts.ZVector = 0;
1542     Opts.CXXOperatorNames = 1;
1543     Opts.LaxVectorConversions = 0;
1544     Opts.DefaultFPContract = 1;
1545     Opts.NativeHalfType = 1;
1546     Opts.NativeHalfArgsAndReturns = 1;
1547     // Include default header file for OpenCL.
1548     if (Opts.IncludeDefaultHeader) {
1549       PPOpts.Includes.push_back("opencl-c.h");
1550     }
1551   }
1552 
1553   Opts.CUDA = IK == IK_CUDA || IK == IK_PreprocessedCuda ||
1554               LangStd == LangStandard::lang_cuda;
1555 
1556   Opts.RenderScript = IK == IK_RenderScript;
1557   if (Opts.RenderScript) {
1558     Opts.NativeHalfType = 1;
1559     Opts.NativeHalfArgsAndReturns = 1;
1560   }
1561 
1562   // OpenCL and C++ both have bool, true, false keywords.
1563   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1564 
1565   // OpenCL has half keyword
1566   Opts.Half = Opts.OpenCL;
1567 
1568   // C++ has wchar_t keyword.
1569   Opts.WChar = Opts.CPlusPlus;
1570 
1571   Opts.GNUKeywords = Opts.GNUMode;
1572   Opts.CXXOperatorNames = Opts.CPlusPlus;
1573 
1574   Opts.DollarIdents = !Opts.AsmPreprocessor;
1575 }
1576 
1577 /// Attempt to parse a visibility value out of the given argument.
1578 static Visibility parseVisibility(Arg *arg, ArgList &args,
1579                                   DiagnosticsEngine &diags) {
1580   StringRef value = arg->getValue();
1581   if (value == "default") {
1582     return DefaultVisibility;
1583   } else if (value == "hidden" || value == "internal") {
1584     return HiddenVisibility;
1585   } else if (value == "protected") {
1586     // FIXME: diagnose if target does not support protected visibility
1587     return ProtectedVisibility;
1588   }
1589 
1590   diags.Report(diag::err_drv_invalid_value)
1591     << arg->getAsString(args) << value;
1592   return DefaultVisibility;
1593 }
1594 
1595 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1596                           const TargetOptions &TargetOpts,
1597                           PreprocessorOptions &PPOpts,
1598                           DiagnosticsEngine &Diags) {
1599   // FIXME: Cleanup per-file based stuff.
1600   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1601   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1602     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1603 #define LANGSTANDARD(id, name, desc, features) \
1604       .Case(name, LangStandard::lang_##id)
1605 #define LANGSTANDARD_ALIAS(id, alias) \
1606       .Case(alias, LangStandard::lang_##id)
1607 #include "clang/Frontend/LangStandards.def"
1608       .Default(LangStandard::lang_unspecified);
1609     if (LangStd == LangStandard::lang_unspecified)
1610       Diags.Report(diag::err_drv_invalid_value)
1611         << A->getAsString(Args) << A->getValue();
1612     else {
1613       // Valid standard, check to make sure language and standard are
1614       // compatible.
1615       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1616       switch (IK) {
1617       case IK_C:
1618       case IK_ObjC:
1619       case IK_PreprocessedC:
1620       case IK_PreprocessedObjC:
1621         if (!(Std.isC89() || Std.isC99()))
1622           Diags.Report(diag::err_drv_argument_not_allowed_with)
1623             << A->getAsString(Args) << "C/ObjC";
1624         break;
1625       case IK_CXX:
1626       case IK_ObjCXX:
1627       case IK_PreprocessedCXX:
1628       case IK_PreprocessedObjCXX:
1629         if (!Std.isCPlusPlus())
1630           Diags.Report(diag::err_drv_argument_not_allowed_with)
1631             << A->getAsString(Args) << "C++/ObjC++";
1632         break;
1633       case IK_OpenCL:
1634         if (!isOpenCL(LangStd))
1635           Diags.Report(diag::err_drv_argument_not_allowed_with)
1636             << A->getAsString(Args) << "OpenCL";
1637         break;
1638       case IK_CUDA:
1639       case IK_PreprocessedCuda:
1640         if (!Std.isCPlusPlus())
1641           Diags.Report(diag::err_drv_argument_not_allowed_with)
1642             << A->getAsString(Args) << "CUDA";
1643         break;
1644       default:
1645         break;
1646       }
1647     }
1648   }
1649 
1650   // -cl-std only applies for OpenCL language standards.
1651   // Override the -std option in this case.
1652   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1653     LangStandard::Kind OpenCLLangStd
1654     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1655     .Cases("cl", "CL", LangStandard::lang_opencl)
1656     .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
1657     .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
1658     .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
1659     .Default(LangStandard::lang_unspecified);
1660 
1661     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1662       Diags.Report(diag::err_drv_invalid_value)
1663       << A->getAsString(Args) << A->getValue();
1664     }
1665     else
1666       LangStd = OpenCLLangStd;
1667   }
1668 
1669   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
1670 
1671   llvm::Triple T(TargetOpts.Triple);
1672   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
1673 
1674   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1675   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1676   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1677   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1678   // name, as it doesn't seem a useful distinction.
1679   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1680                                   Opts.GNUKeywords);
1681 
1682   if (Args.hasArg(OPT_fno_operator_names))
1683     Opts.CXXOperatorNames = 0;
1684 
1685   if (Args.hasArg(OPT_fcuda_is_device))
1686     Opts.CUDAIsDevice = 1;
1687 
1688   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1689     Opts.CUDAAllowVariadicFunctions = 1;
1690 
1691   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1692     Opts.CUDAHostDeviceConstexpr = 0;
1693 
1694   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1695     Opts.CUDADeviceFlushDenormalsToZero = 1;
1696 
1697   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1698     Opts.CUDADeviceApproxTranscendentals = 1;
1699 
1700   if (Opts.ObjC1) {
1701     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1702       StringRef value = arg->getValue();
1703       if (Opts.ObjCRuntime.tryParse(value))
1704         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1705     }
1706 
1707     if (Args.hasArg(OPT_fobjc_gc_only))
1708       Opts.setGC(LangOptions::GCOnly);
1709     else if (Args.hasArg(OPT_fobjc_gc))
1710       Opts.setGC(LangOptions::HybridGC);
1711     else if (Args.hasArg(OPT_fobjc_arc)) {
1712       Opts.ObjCAutoRefCount = 1;
1713       if (!Opts.ObjCRuntime.allowsARC())
1714         Diags.Report(diag::err_arc_unsupported_on_runtime);
1715     }
1716 
1717     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
1718     // whether the feature is actually enabled.  This is predominantly
1719     // determined by -fobjc-runtime, but we allow it to be overridden
1720     // from the command line for testing purposes.
1721     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1722       Opts.ObjCWeakRuntime = 1;
1723     else
1724       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
1725 
1726     // ObjCWeak determines whether __weak is actually enabled.
1727     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
1728     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
1729       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
1730         assert(!Opts.ObjCWeak);
1731       } else if (Opts.getGC() != LangOptions::NonGC) {
1732         Diags.Report(diag::err_objc_weak_with_gc);
1733       } else if (!Opts.ObjCWeakRuntime) {
1734         Diags.Report(diag::err_objc_weak_unsupported);
1735       } else {
1736         Opts.ObjCWeak = 1;
1737       }
1738     } else if (Opts.ObjCAutoRefCount) {
1739       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
1740     }
1741 
1742     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1743       Opts.ObjCInferRelatedResultType = 0;
1744 
1745     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1746       Opts.ObjCSubscriptingLegacyRuntime =
1747         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1748   }
1749 
1750   if (Args.hasArg(OPT_fgnu89_inline)) {
1751     if (Opts.CPlusPlus)
1752       Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fgnu89-inline"
1753                                                             << "C++/ObjC++";
1754     else
1755       Opts.GNUInline = 1;
1756   }
1757 
1758   if (Args.hasArg(OPT_fapple_kext)) {
1759     if (!Opts.CPlusPlus)
1760       Diags.Report(diag::warn_c_kext);
1761     else
1762       Opts.AppleKext = 1;
1763   }
1764 
1765   if (Args.hasArg(OPT_print_ivar_layout))
1766     Opts.ObjCGCBitmapPrint = 1;
1767   if (Args.hasArg(OPT_fno_constant_cfstrings))
1768     Opts.NoConstantCFStrings = 1;
1769 
1770   if (Args.hasArg(OPT_faltivec))
1771     Opts.AltiVec = 1;
1772 
1773   if (Args.hasArg(OPT_fzvector))
1774     Opts.ZVector = 1;
1775 
1776   if (Args.hasArg(OPT_pthread))
1777     Opts.POSIXThreads = 1;
1778 
1779   // The value-visibility mode defaults to "default".
1780   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1781     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1782   } else {
1783     Opts.setValueVisibilityMode(DefaultVisibility);
1784   }
1785 
1786   // The type-visibility mode defaults to the value-visibility mode.
1787   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1788     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1789   } else {
1790     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1791   }
1792 
1793   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1794     Opts.InlineVisibilityHidden = 1;
1795 
1796   if (Args.hasArg(OPT_ftrapv)) {
1797     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1798     // Set the handler, if one is specified.
1799     Opts.OverflowHandler =
1800         Args.getLastArgValue(OPT_ftrapv_handler);
1801   }
1802   else if (Args.hasArg(OPT_fwrapv))
1803     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1804 
1805   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1806   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1807   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1808   Opts.MSCompatibilityVersion = 0;
1809   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
1810     VersionTuple VT;
1811     if (VT.tryParse(A->getValue()))
1812       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
1813                                                 << A->getValue();
1814     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
1815                                   VT.getMinor().getValueOr(0) * 100000 +
1816                                   VT.getSubminor().getValueOr(0);
1817   }
1818 
1819   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1820   // is specified, or -std is set to a conforming mode.
1821   // Trigraphs are disabled by default in c++1z onwards.
1822   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
1823   Opts.Trigraphs =
1824       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
1825 
1826   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1827                                    OPT_fno_dollars_in_identifiers,
1828                                    Opts.DollarIdents);
1829   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1830   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1831   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1832   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1833   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1834                                    Opts.ConstStrings);
1835   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1836     Opts.LaxVectorConversions = 0;
1837   if (Args.hasArg(OPT_fno_threadsafe_statics))
1838     Opts.ThreadsafeStatics = 0;
1839   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1840   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1841   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1842   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1843   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
1844   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1845 
1846   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
1847   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
1848   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
1849     && Opts.OpenCLVersion >= 200);
1850   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1851   Opts.Coroutines = Args.hasArg(OPT_fcoroutines);
1852   Opts.Modules = Args.hasArg(OPT_fmodules);
1853   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
1854   Opts.ModulesDeclUse =
1855       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
1856   Opts.ModulesLocalVisibility =
1857       Args.hasArg(OPT_fmodules_local_submodule_visibility);
1858   Opts.ModulesSearchAll = Opts.Modules &&
1859     !Args.hasArg(OPT_fno_modules_search_all) &&
1860     Args.hasArg(OPT_fmodules_search_all);
1861   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
1862   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
1863   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1864   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1865   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1866   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1867   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1868   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1869   if (!Opts.NoBuiltin)
1870     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
1871   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1872   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1873   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
1874   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1875   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1876   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1877   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1878   Opts.InstantiationDepth =
1879       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1880   Opts.ArrowDepth =
1881       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1882   Opts.ConstexprCallDepth =
1883       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1884   Opts.ConstexprStepLimit =
1885       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1886   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1887   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1888   Opts.NumLargeByValueCopy =
1889       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1890   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1891   Opts.ObjCConstantStringClass =
1892     Args.getLastArgValue(OPT_fconstant_string_class);
1893   Opts.ObjCDefaultSynthProperties =
1894     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1895   Opts.EncodeExtendedBlockSig =
1896     Args.hasArg(OPT_fencode_extended_block_signature);
1897   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1898   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1899   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
1900   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
1901   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1902   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1903   Opts.Static = Args.hasArg(OPT_static_define);
1904   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1905   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1906                         || Args.hasArg(OPT_fdump_record_layouts);
1907   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1908   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1909   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1910   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1911   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1912   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1913   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1914   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1915   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1916   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1917   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1918   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1919   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
1920   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
1921   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
1922   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
1923   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
1924   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
1925   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
1926   // is enabled.
1927   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
1928                             | Opts.NativeHalfArgsAndReturns;
1929   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
1930 
1931   // __declspec is enabled by default for the PS4 by the driver, and also
1932   // enabled for Microsoft Extensions or Borland Extensions, here.
1933   //
1934   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
1935   // CUDA extension, however it is required for supporting cuda_builtin_vars.h,
1936   // which uses __declspec(property). Once that has been rewritten in terms of
1937   // something more generic, remove the Opts.CUDA term here.
1938   Opts.DeclSpecKeyword =
1939       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
1940                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
1941 
1942   // For now, we only support local submodule visibility in C++ (because we
1943   // heavily depend on the ODR for merging redefinitions).
1944   if (Opts.ModulesLocalVisibility && !Opts.CPlusPlus)
1945     Diags.Report(diag::err_drv_argument_not_allowed_with)
1946         << "-fmodules-local-submodule-visibility" << "C";
1947 
1948   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1949     switch (llvm::StringSwitch<unsigned>(A->getValue())
1950       .Case("target", LangOptions::ASMM_Target)
1951       .Case("no", LangOptions::ASMM_Off)
1952       .Case("yes", LangOptions::ASMM_On)
1953       .Default(255)) {
1954     default:
1955       Diags.Report(diag::err_drv_invalid_value)
1956         << "-faddress-space-map-mangling=" << A->getValue();
1957       break;
1958     case LangOptions::ASMM_Target:
1959       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1960       break;
1961     case LangOptions::ASMM_On:
1962       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1963       break;
1964     case LangOptions::ASMM_Off:
1965       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1966       break;
1967     }
1968   }
1969 
1970   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
1971     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
1972         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
1973             A->getValue())
1974             .Case("single",
1975                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
1976             .Case("multiple",
1977                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
1978             .Case("virtual",
1979                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
1980             .Default(LangOptions::PPTMK_BestCase);
1981     if (InheritanceModel == LangOptions::PPTMK_BestCase)
1982       Diags.Report(diag::err_drv_invalid_value)
1983           << "-fms-memptr-rep=" << A->getValue();
1984 
1985     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
1986   }
1987 
1988   // Check for MS default calling conventions being specified.
1989   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
1990     LangOptions::DefaultCallingConvention DefaultCC =
1991         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
1992             A->getValue())
1993             .Case("cdecl", LangOptions::DCC_CDecl)
1994             .Case("fastcall", LangOptions::DCC_FastCall)
1995             .Case("stdcall", LangOptions::DCC_StdCall)
1996             .Case("vectorcall", LangOptions::DCC_VectorCall)
1997             .Default(LangOptions::DCC_None);
1998     if (DefaultCC == LangOptions::DCC_None)
1999       Diags.Report(diag::err_drv_invalid_value)
2000           << "-fdefault-calling-conv=" << A->getValue();
2001 
2002     llvm::Triple T(TargetOpts.Triple);
2003     llvm::Triple::ArchType Arch = T.getArch();
2004     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2005                   DefaultCC == LangOptions::DCC_StdCall) &&
2006                  Arch != llvm::Triple::x86;
2007     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
2008                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2009     if (emitError)
2010       Diags.Report(diag::err_drv_argument_not_allowed_with)
2011           << A->getSpelling() << T.getTriple();
2012     else
2013       Opts.setDefaultCallingConv(DefaultCC);
2014   }
2015 
2016   // -mrtd option
2017   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2018     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2019       Diags.Report(diag::err_drv_argument_not_allowed_with)
2020           << A->getSpelling() << "-fdefault-calling-conv";
2021     else {
2022       llvm::Triple T(TargetOpts.Triple);
2023       if (T.getArch() != llvm::Triple::x86)
2024         Diags.Report(diag::err_drv_argument_not_allowed_with)
2025             << A->getSpelling() << T.getTriple();
2026       else
2027         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2028     }
2029   }
2030 
2031   // Check if -fopenmp is specified.
2032   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2033   Opts.OpenMPUseTLS =
2034       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2035   Opts.OpenMPIsDevice =
2036       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2037 
2038   if (Opts.OpenMP) {
2039     int Version =
2040         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2041     if (Version != 0)
2042       Opts.OpenMP = Version;
2043     // Provide diagnostic when a given target is not expected to be an OpenMP
2044     // device or host.
2045     if (!Opts.OpenMPIsDevice) {
2046       switch (T.getArch()) {
2047       default:
2048         break;
2049       // Add unsupported host targets here:
2050       case llvm::Triple::nvptx:
2051       case llvm::Triple::nvptx64:
2052         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2053             << TargetOpts.Triple;
2054         break;
2055       }
2056     }
2057   }
2058 
2059   // Get the OpenMP target triples if any.
2060   if (Arg *A = Args.getLastArg(options::OPT_fomptargets_EQ)) {
2061 
2062     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2063       llvm::Triple TT(A->getValue(i));
2064 
2065       if (TT.getArch() == llvm::Triple::UnknownArch)
2066         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2067       else
2068         Opts.OMPTargetTriples.push_back(TT);
2069     }
2070   }
2071 
2072   // Get OpenMP host file path if any and report if a non existent file is
2073   // found
2074   if (Arg *A = Args.getLastArg(options::OPT_fomp_host_ir_file_path)) {
2075     Opts.OMPHostIRFile = A->getValue();
2076     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2077       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2078           << Opts.OMPHostIRFile;
2079   }
2080 
2081   // Record whether the __DEPRECATED define was requested.
2082   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2083                                  OPT_fno_deprecated_macro,
2084                                  Opts.Deprecated);
2085 
2086   // FIXME: Eliminate this dependency.
2087   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2088        OptSize = getOptimizationLevelSize(Args);
2089   Opts.Optimize = Opt != 0;
2090   Opts.OptimizeSize = OptSize != 0;
2091 
2092   // This is the __NO_INLINE__ define, which just depends on things like the
2093   // optimization level and -fno-inline, not actually whether the backend has
2094   // inlining enabled.
2095   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
2096 
2097   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2098       Args.hasArg(OPT_cl_fast_relaxed_math);
2099   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2100       Args.hasArg(OPT_cl_finite_math_only) ||
2101       Args.hasArg(OPT_cl_fast_relaxed_math);
2102   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2103                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2104                       Args.hasArg(OPT_cl_fast_relaxed_math);
2105 
2106   Opts.RetainCommentsFromSystemHeaders =
2107       Args.hasArg(OPT_fretain_comments_from_system_headers);
2108 
2109   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2110   switch (SSP) {
2111   default:
2112     Diags.Report(diag::err_drv_invalid_value)
2113       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2114     break;
2115   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2116   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2117   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2118   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2119   }
2120 
2121   // Parse -fsanitize= arguments.
2122   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2123                       Diags, Opts.Sanitize);
2124   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2125   Opts.SanitizeAddressFieldPadding =
2126       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2127   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2128 }
2129 
2130 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2131                                   FileManager &FileMgr,
2132                                   DiagnosticsEngine &Diags) {
2133   using namespace options;
2134   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2135   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2136   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2137       Opts.TokenCache = A->getValue();
2138   else
2139     Opts.TokenCache = Opts.ImplicitPTHInclude;
2140   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2141   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2142   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2143 
2144   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2145   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2146     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2147 
2148   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2149     StringRef Value(A->getValue());
2150     size_t Comma = Value.find(',');
2151     unsigned Bytes = 0;
2152     unsigned EndOfLine = 0;
2153 
2154     if (Comma == StringRef::npos ||
2155         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2156         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2157       Diags.Report(diag::err_drv_preamble_format);
2158     else {
2159       Opts.PrecompiledPreambleBytes.first = Bytes;
2160       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2161     }
2162   }
2163 
2164   // Add macros from the command line.
2165   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2166     if (A->getOption().matches(OPT_D))
2167       Opts.addMacroDef(A->getValue());
2168     else
2169       Opts.addMacroUndef(A->getValue());
2170   }
2171 
2172   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2173 
2174   // Add the ordered list of -includes.
2175   for (const Arg *A : Args.filtered(OPT_include))
2176     Opts.Includes.emplace_back(A->getValue());
2177 
2178   for (const Arg *A : Args.filtered(OPT_chain_include))
2179     Opts.ChainedIncludes.emplace_back(A->getValue());
2180 
2181   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2182     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2183 
2184     if (Split.second.empty()) {
2185       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2186       continue;
2187     }
2188 
2189     Opts.addRemappedFile(Split.first, Split.second);
2190   }
2191 
2192   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2193     StringRef Name = A->getValue();
2194     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2195       .Case("libc++", ARCXX_libcxx)
2196       .Case("libstdc++", ARCXX_libstdcxx)
2197       .Case("none", ARCXX_nolib)
2198       .Default(~0U);
2199     if (Library == ~0U)
2200       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2201     else
2202       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2203   }
2204 }
2205 
2206 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2207                                         ArgList &Args,
2208                                         frontend::ActionKind Action) {
2209   using namespace options;
2210 
2211   switch (Action) {
2212   case frontend::ASTDeclList:
2213   case frontend::ASTDump:
2214   case frontend::ASTPrint:
2215   case frontend::ASTView:
2216   case frontend::EmitAssembly:
2217   case frontend::EmitBC:
2218   case frontend::EmitHTML:
2219   case frontend::EmitLLVM:
2220   case frontend::EmitLLVMOnly:
2221   case frontend::EmitCodeGenOnly:
2222   case frontend::EmitObj:
2223   case frontend::FixIt:
2224   case frontend::GenerateModule:
2225   case frontend::GeneratePCH:
2226   case frontend::GeneratePTH:
2227   case frontend::ParseSyntaxOnly:
2228   case frontend::ModuleFileInfo:
2229   case frontend::VerifyPCH:
2230   case frontend::PluginAction:
2231   case frontend::PrintDeclContext:
2232   case frontend::RewriteObjC:
2233   case frontend::RewriteTest:
2234   case frontend::RunAnalysis:
2235   case frontend::MigrateSource:
2236     Opts.ShowCPP = 0;
2237     break;
2238 
2239   case frontend::DumpRawTokens:
2240   case frontend::DumpTokens:
2241   case frontend::InitOnly:
2242   case frontend::PrintPreamble:
2243   case frontend::PrintPreprocessedInput:
2244   case frontend::RewriteMacros:
2245   case frontend::RunPreprocessorOnly:
2246     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2247     break;
2248   }
2249 
2250   Opts.ShowComments = Args.hasArg(OPT_C);
2251   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2252   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2253   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2254   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2255   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2256 }
2257 
2258 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2259                             DiagnosticsEngine &Diags) {
2260   using namespace options;
2261   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2262   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2263     StringRef Value = A->getValue();
2264     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2265                                  .Case("default", llvm::EABI::Default)
2266                                  .Case("4", llvm::EABI::EABI4)
2267                                  .Case("5", llvm::EABI::EABI5)
2268                                  .Case("gnu", llvm::EABI::GNU)
2269                                  .Default(llvm::EABI::Unknown);
2270     if (EABIVersion == llvm::EABI::Unknown)
2271       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2272                                                 << Value;
2273     else
2274       Opts.EABIVersion = Value;
2275   }
2276   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2277   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2278   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2279   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2280   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2281   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2282   // Use the default target triple if unspecified.
2283   if (Opts.Triple.empty())
2284     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2285 }
2286 
2287 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2288                                         const char *const *ArgBegin,
2289                                         const char *const *ArgEnd,
2290                                         DiagnosticsEngine &Diags) {
2291   bool Success = true;
2292 
2293   // Parse the arguments.
2294   std::unique_ptr<OptTable> Opts(createDriverOptTable());
2295   const unsigned IncludedFlagsBitmask = options::CC1Option;
2296   unsigned MissingArgIndex, MissingArgCount;
2297   InputArgList Args =
2298       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2299                       MissingArgCount, IncludedFlagsBitmask);
2300   LangOptions &LangOpts = *Res.getLangOpts();
2301 
2302   // Check for missing argument error.
2303   if (MissingArgCount) {
2304     Diags.Report(diag::err_drv_missing_argument)
2305         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2306     Success = false;
2307   }
2308 
2309   // Issue errors on unknown arguments.
2310   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2311     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2312     Success = false;
2313   }
2314 
2315   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2316   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2317   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2318   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2319                                  false /*DefaultDiagColor*/);
2320   ParseCommentArgs(LangOpts.CommentOpts, Args);
2321   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2322   // FIXME: We shouldn't have to pass the DashX option around here
2323   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags);
2324   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2325   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2326                               Res.getTargetOpts());
2327   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args);
2328   if (DashX == IK_AST || DashX == IK_LLVM_IR) {
2329     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2330     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2331     // what the input type is.
2332     if (Args.hasArg(OPT_fobjc_arc))
2333       LangOpts.ObjCAutoRefCount = 1;
2334     // PIClevel and PIELevel are needed during code generation and this should be
2335     // set regardless of the input type.
2336     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2337     LangOpts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
2338     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2339                         Diags, LangOpts.Sanitize);
2340   } else {
2341     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2342     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
2343       Res.getPreprocessorOpts(), Diags);
2344     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2345       LangOpts.ObjCExceptions = 1;
2346   }
2347 
2348   if (LangOpts.CUDA) {
2349     // During CUDA device-side compilation, the aux triple is the
2350     // triple used for host compilation.
2351     if (LangOpts.CUDAIsDevice)
2352       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2353 
2354     // Set default FP_CONTRACT to FAST.
2355     if (!Args.hasArg(OPT_ffp_contract))
2356       Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
2357   }
2358 
2359   // FIXME: Override value name discarding when asan or msan is used because the
2360   // backend passes depend on the name of the alloca in order to print out
2361   // names.
2362   Res.getCodeGenOpts().DiscardValueNames &=
2363       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2364       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2365 
2366   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2367   // PCH file and find the original header name. Remove the need to do that in
2368   // ParsePreprocessorArgs and remove the FileManager
2369   // parameters from the function and the "FileManager.h" #include.
2370   FileManager FileMgr(Res.getFileSystemOpts());
2371   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags);
2372   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2373                               Res.getFrontendOpts().ProgramAction);
2374   return Success;
2375 }
2376 
2377 std::string CompilerInvocation::getModuleHash() const {
2378   // Note: For QoI reasons, the things we use as a hash here should all be
2379   // dumped via the -module-info flag.
2380   using llvm::hash_code;
2381   using llvm::hash_value;
2382   using llvm::hash_combine;
2383 
2384   // Start the signature with the compiler version.
2385   // FIXME: We'd rather use something more cryptographically sound than
2386   // CityHash, but this will do for now.
2387   hash_code code = hash_value(getClangFullRepositoryVersion());
2388 
2389   // Extend the signature with the language options
2390 #define LANGOPT(Name, Bits, Default, Description) \
2391    code = hash_combine(code, LangOpts->Name);
2392 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2393   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2394 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2395 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2396 #include "clang/Basic/LangOptions.def"
2397 
2398   for (StringRef Feature : LangOpts->ModuleFeatures)
2399     code = hash_combine(code, Feature);
2400 
2401   // Extend the signature with the target options.
2402   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2403                       TargetOpts->ABI);
2404   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2405     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2406 
2407   // Extend the signature with preprocessor options.
2408   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2409   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2410   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2411 
2412   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2413             I = getPreprocessorOpts().Macros.begin(),
2414          IEnd = getPreprocessorOpts().Macros.end();
2415        I != IEnd; ++I) {
2416     // If we're supposed to ignore this macro for the purposes of modules,
2417     // don't put it into the hash.
2418     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2419       // Check whether we're ignoring this macro.
2420       StringRef MacroDef = I->first;
2421       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
2422         continue;
2423     }
2424 
2425     code = hash_combine(code, I->first, I->second);
2426   }
2427 
2428   // Extend the signature with the sysroot and other header search options.
2429   code = hash_combine(code, hsOpts.Sysroot,
2430                       hsOpts.ModuleFormat,
2431                       hsOpts.UseDebugInfo,
2432                       hsOpts.UseBuiltinIncludes,
2433                       hsOpts.UseStandardSystemIncludes,
2434                       hsOpts.UseStandardCXXIncludes,
2435                       hsOpts.UseLibcxx);
2436   code = hash_combine(code, hsOpts.ResourceDir);
2437 
2438   // Extend the signature with the user build path.
2439   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2440 
2441   // Extend the signature with the module file extensions.
2442   const FrontendOptions &frontendOpts = getFrontendOpts();
2443   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2444     code = ext->hashExtension(code);
2445   }
2446 
2447   // Darwin-specific hack: if we have a sysroot, use the contents and
2448   // modification time of
2449   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
2450   // as part of the module hash.
2451   if (!hsOpts.Sysroot.empty()) {
2452     SmallString<128> systemVersionFile;
2453     systemVersionFile += hsOpts.Sysroot;
2454     llvm::sys::path::append(systemVersionFile, "System");
2455     llvm::sys::path::append(systemVersionFile, "Library");
2456     llvm::sys::path::append(systemVersionFile, "CoreServices");
2457     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
2458 
2459     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer =
2460         llvm::MemoryBuffer::getFile(systemVersionFile);
2461     if (buffer) {
2462       code = hash_combine(code, buffer.get()->getBuffer());
2463 
2464       struct stat statBuf;
2465       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
2466         code = hash_combine(code, statBuf.st_mtime);
2467     }
2468   }
2469 
2470   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2471 }
2472 
2473 namespace clang {
2474 
2475 template<typename IntTy>
2476 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2477                                     IntTy Default,
2478                                     DiagnosticsEngine *Diags) {
2479   IntTy Res = Default;
2480   if (Arg *A = Args.getLastArg(Id)) {
2481     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2482       if (Diags)
2483         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2484                                                        << A->getValue();
2485     }
2486   }
2487   return Res;
2488 }
2489 
2490 
2491 // Declared in clang/Frontend/Utils.h.
2492 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2493                        DiagnosticsEngine *Diags) {
2494   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2495 }
2496 
2497 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2498                                uint64_t Default,
2499                                DiagnosticsEngine *Diags) {
2500   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2501 }
2502 
2503 void BuryPointer(const void *Ptr) {
2504   // This function may be called only a small fixed amount of times per each
2505   // invocation, otherwise we do actually have a leak which we want to report.
2506   // If this function is called more than kGraveYardMaxSize times, the pointers
2507   // will not be properly buried and a leak detector will report a leak, which
2508   // is what we want in such case.
2509   static const size_t kGraveYardMaxSize = 16;
2510   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2511   static std::atomic<unsigned> GraveYardSize;
2512   unsigned Idx = GraveYardSize++;
2513   if (Idx >= kGraveYardMaxSize)
2514     return;
2515   GraveYard[Idx] = Ptr;
2516 }
2517 
2518 IntrusiveRefCntPtr<vfs::FileSystem>
2519 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2520                                 DiagnosticsEngine &Diags) {
2521   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2522     return vfs::getRealFileSystem();
2523 
2524   IntrusiveRefCntPtr<vfs::OverlayFileSystem>
2525     Overlay(new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
2526   // earlier vfs files are on the bottom
2527   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2528     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2529         llvm::MemoryBuffer::getFile(File);
2530     if (!Buffer) {
2531       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2532       return IntrusiveRefCntPtr<vfs::FileSystem>();
2533     }
2534 
2535     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2536         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2537     if (!FS.get()) {
2538       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2539       return IntrusiveRefCntPtr<vfs::FileSystem>();
2540     }
2541     Overlay->pushOverlay(FS);
2542   }
2543   return Overlay;
2544 }
2545 } // end namespace clang
2546