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 std::string 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.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
687   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
688     unsigned LinkFlags = llvm::Linker::Flags::None;
689     if (A->getOption().matches(OPT_mlink_cuda_bitcode))
690       LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded |
691                   llvm::Linker::Flags::InternalizeLinkedSymbols;
692     Opts.LinkBitcodeFiles.push_back(std::make_pair(LinkFlags, A->getValue()));
693   }
694   Opts.SanitizeCoverageType =
695       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
696   Opts.SanitizeCoverageIndirectCalls =
697       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
698   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
699   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
700   Opts.SanitizeCoverage8bitCounters =
701       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
702   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
703   Opts.SanitizeMemoryTrackOrigins =
704       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
705   Opts.SanitizeMemoryUseAfterDtor =
706       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
707   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
708   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
709   Opts.SSPBufferSize =
710       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
711   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
712   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
713     StringRef Val = A->getValue();
714     unsigned StackAlignment = Opts.StackAlignment;
715     Val.getAsInteger(10, StackAlignment);
716     Opts.StackAlignment = StackAlignment;
717   }
718 
719   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
720     StringRef Val = A->getValue();
721     unsigned StackProbeSize = Opts.StackProbeSize;
722     Val.getAsInteger(0, StackProbeSize);
723     Opts.StackProbeSize = StackProbeSize;
724   }
725 
726   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
727     StringRef Name = A->getValue();
728     unsigned Method = llvm::StringSwitch<unsigned>(Name)
729       .Case("legacy", CodeGenOptions::Legacy)
730       .Case("non-legacy", CodeGenOptions::NonLegacy)
731       .Case("mixed", CodeGenOptions::Mixed)
732       .Default(~0U);
733     if (Method == ~0U) {
734       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
735       Success = false;
736     } else {
737       Opts.setObjCDispatchMethod(
738         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
739     }
740   }
741 
742   Opts.EmulatedTLS =
743       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
744 
745   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
746     StringRef Name = A->getValue();
747     unsigned Model = llvm::StringSwitch<unsigned>(Name)
748         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
749         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
750         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
751         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
752         .Default(~0U);
753     if (Model == ~0U) {
754       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
755       Success = false;
756     } else {
757       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
758     }
759   }
760 
761   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
762     StringRef Val = A->getValue();
763     if (Val == "fast")
764       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
765     else if (Val == "on")
766       Opts.setFPContractMode(CodeGenOptions::FPC_On);
767     else if (Val == "off")
768       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
769     else
770       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
771   }
772 
773   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
774     if (A->getOption().matches(OPT_fpcc_struct_return)) {
775       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
776     } else {
777       assert(A->getOption().matches(OPT_freg_struct_return));
778       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
779     }
780   }
781 
782   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
783   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
784   bool NeedLocTracking = false;
785 
786   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
787     Opts.OptimizationRemarkPattern =
788         GenerateOptimizationRemarkRegex(Diags, Args, A);
789     NeedLocTracking = true;
790   }
791 
792   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
793     Opts.OptimizationRemarkMissedPattern =
794         GenerateOptimizationRemarkRegex(Diags, Args, A);
795     NeedLocTracking = true;
796   }
797 
798   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
799     Opts.OptimizationRemarkAnalysisPattern =
800         GenerateOptimizationRemarkRegex(Diags, Args, A);
801     NeedLocTracking = true;
802   }
803 
804   // If the user requested to use a sample profile for PGO, then the
805   // backend will need to track source location information so the profile
806   // can be incorporated into the IR.
807   if (!Opts.SampleProfileFile.empty())
808     NeedLocTracking = true;
809 
810   // If the user requested a flag that requires source locations available in
811   // the backend, make sure that the backend tracks source location information.
812   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
813     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
814 
815   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
816 
817   // Parse -fsanitize-recover= arguments.
818   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
819   parseSanitizerKinds("-fsanitize-recover=",
820                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
821                       Opts.SanitizeRecover);
822   parseSanitizerKinds("-fsanitize-trap=",
823                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
824                       Opts.SanitizeTrap);
825 
826   Opts.CudaGpuBinaryFileNames =
827       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
828 
829   Opts.Backchain = Args.hasArg(OPT_mbackchain);
830 
831   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
832       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
833 
834   return Success;
835 }
836 
837 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
838                                       ArgList &Args) {
839   using namespace options;
840   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
841   Opts.Targets = Args.getAllArgValues(OPT_MT);
842   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
843   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
844   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
845   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
846   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
847   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
848   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
849   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
850   Opts.ModuleDependencyOutputDir =
851       Args.getLastArgValue(OPT_module_dependency_dir);
852   if (Args.hasArg(OPT_MV))
853     Opts.OutputFormat = DependencyOutputFormat::NMake;
854   // Add sanitizer blacklists as extra dependencies.
855   // They won't be discovered by the regular preprocessor, so
856   // we let make / ninja to know about this implicit dependency.
857   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
858   auto ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
859   Opts.ExtraDeps.insert(Opts.ExtraDeps.end(), ModuleFiles.begin(),
860                         ModuleFiles.end());
861 }
862 
863 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
864   // Color diagnostics default to auto ("on" if terminal supports) in the driver
865   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
866   // Support both clang's -f[no-]color-diagnostics and gcc's
867   // -f[no-]diagnostics-colors[=never|always|auto].
868   enum {
869     Colors_On,
870     Colors_Off,
871     Colors_Auto
872   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
873   for (Arg *A : Args) {
874     const Option &O = A->getOption();
875     if (!O.matches(options::OPT_fcolor_diagnostics) &&
876         !O.matches(options::OPT_fdiagnostics_color) &&
877         !O.matches(options::OPT_fno_color_diagnostics) &&
878         !O.matches(options::OPT_fno_diagnostics_color) &&
879         !O.matches(options::OPT_fdiagnostics_color_EQ))
880       continue;
881 
882     if (O.matches(options::OPT_fcolor_diagnostics) ||
883         O.matches(options::OPT_fdiagnostics_color)) {
884       ShowColors = Colors_On;
885     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
886                O.matches(options::OPT_fno_diagnostics_color)) {
887       ShowColors = Colors_Off;
888     } else {
889       assert(O.matches(options::OPT_fdiagnostics_color_EQ));
890       StringRef Value(A->getValue());
891       if (Value == "always")
892         ShowColors = Colors_On;
893       else if (Value == "never")
894         ShowColors = Colors_Off;
895       else if (Value == "auto")
896         ShowColors = Colors_Auto;
897     }
898   }
899   if (ShowColors == Colors_On ||
900       (ShowColors == Colors_Auto && llvm::sys::Process::StandardErrHasColors()))
901     return true;
902   return false;
903 }
904 
905 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
906                                 DiagnosticsEngine *Diags,
907                                 bool DefaultDiagColor) {
908   using namespace options;
909   bool Success = true;
910 
911   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
912   if (Arg *A =
913           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
914     Opts.DiagnosticSerializationFile = A->getValue();
915   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
916   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
917   Opts.Pedantic = Args.hasArg(OPT_pedantic);
918   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
919   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
920   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
921   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
922                                  OPT_fno_show_column,
923                                  /*Default=*/true);
924   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
925   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
926   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
927 
928   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
929 
930   // Default behavior is to not to show note include stacks.
931   Opts.ShowNoteIncludeStack = false;
932   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
933                                OPT_fno_diagnostics_show_note_include_stack))
934     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
935       Opts.ShowNoteIncludeStack = true;
936 
937   StringRef ShowOverloads =
938     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
939   if (ShowOverloads == "best")
940     Opts.setShowOverloads(Ovl_Best);
941   else if (ShowOverloads == "all")
942     Opts.setShowOverloads(Ovl_All);
943   else {
944     Success = false;
945     if (Diags)
946       Diags->Report(diag::err_drv_invalid_value)
947       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
948       << ShowOverloads;
949   }
950 
951   StringRef ShowCategory =
952     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
953   if (ShowCategory == "none")
954     Opts.ShowCategories = 0;
955   else if (ShowCategory == "id")
956     Opts.ShowCategories = 1;
957   else if (ShowCategory == "name")
958     Opts.ShowCategories = 2;
959   else {
960     Success = false;
961     if (Diags)
962       Diags->Report(diag::err_drv_invalid_value)
963       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
964       << ShowCategory;
965   }
966 
967   StringRef Format =
968     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
969   if (Format == "clang")
970     Opts.setFormat(DiagnosticOptions::Clang);
971   else if (Format == "msvc")
972     Opts.setFormat(DiagnosticOptions::MSVC);
973   else if (Format == "msvc-fallback") {
974     Opts.setFormat(DiagnosticOptions::MSVC);
975     Opts.CLFallbackMode = true;
976   } else if (Format == "vi")
977     Opts.setFormat(DiagnosticOptions::Vi);
978   else {
979     Success = false;
980     if (Diags)
981       Diags->Report(diag::err_drv_invalid_value)
982       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
983       << Format;
984   }
985 
986   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
987   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
988   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
989   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
990   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
991   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
992     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
993     Diags, DiagMask);
994   if (Args.hasArg(OPT_verify_ignore_unexpected))
995     DiagMask = DiagnosticLevelMask::All;
996   Opts.setVerifyIgnoreUnexpected(DiagMask);
997   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
998   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
999   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1000   Opts.MacroBacktraceLimit =
1001       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1002                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1003   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1004       Args, OPT_ftemplate_backtrace_limit,
1005       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1006   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1007       Args, OPT_fconstexpr_backtrace_limit,
1008       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1009   Opts.SpellCheckingLimit = getLastArgIntValue(
1010       Args, OPT_fspell_checking_limit,
1011       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1012   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1013                                     DiagnosticOptions::DefaultTabStop, Diags);
1014   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1015     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1016     if (Diags)
1017       Diags->Report(diag::warn_ignoring_ftabstop_value)
1018       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1019   }
1020   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1021   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1022   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1023 
1024   return Success;
1025 }
1026 
1027 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1028   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1029 }
1030 
1031 /// Parse the argument to the -ftest-module-file-extension
1032 /// command-line argument.
1033 ///
1034 /// \returns true on error, false on success.
1035 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1036                                             std::string &BlockName,
1037                                             unsigned &MajorVersion,
1038                                             unsigned &MinorVersion,
1039                                             bool &Hashed,
1040                                             std::string &UserInfo) {
1041   SmallVector<StringRef, 5> Args;
1042   Arg.split(Args, ':', 5);
1043   if (Args.size() < 5)
1044     return true;
1045 
1046   BlockName = Args[0];
1047   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1048   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1049   if (Args[3].getAsInteger(2, Hashed)) return true;
1050   if (Args.size() > 4)
1051     UserInfo = Args[4];
1052   return false;
1053 }
1054 
1055 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1056                                    DiagnosticsEngine &Diags) {
1057   using namespace options;
1058   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1059   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1060     switch (A->getOption().getID()) {
1061     default:
1062       llvm_unreachable("Invalid option in group!");
1063     case OPT_ast_list:
1064       Opts.ProgramAction = frontend::ASTDeclList; break;
1065     case OPT_ast_dump:
1066     case OPT_ast_dump_lookups:
1067       Opts.ProgramAction = frontend::ASTDump; break;
1068     case OPT_ast_print:
1069       Opts.ProgramAction = frontend::ASTPrint; break;
1070     case OPT_ast_view:
1071       Opts.ProgramAction = frontend::ASTView; break;
1072     case OPT_dump_raw_tokens:
1073       Opts.ProgramAction = frontend::DumpRawTokens; break;
1074     case OPT_dump_tokens:
1075       Opts.ProgramAction = frontend::DumpTokens; break;
1076     case OPT_S:
1077       Opts.ProgramAction = frontend::EmitAssembly; break;
1078     case OPT_emit_llvm_bc:
1079       Opts.ProgramAction = frontend::EmitBC; break;
1080     case OPT_emit_html:
1081       Opts.ProgramAction = frontend::EmitHTML; break;
1082     case OPT_emit_llvm:
1083       Opts.ProgramAction = frontend::EmitLLVM; break;
1084     case OPT_emit_llvm_only:
1085       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1086     case OPT_emit_codegen_only:
1087       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1088     case OPT_emit_obj:
1089       Opts.ProgramAction = frontend::EmitObj; break;
1090     case OPT_fixit_EQ:
1091       Opts.FixItSuffix = A->getValue();
1092       // fall-through!
1093     case OPT_fixit:
1094       Opts.ProgramAction = frontend::FixIt; break;
1095     case OPT_emit_module:
1096       Opts.ProgramAction = frontend::GenerateModule; break;
1097     case OPT_emit_pch:
1098       Opts.ProgramAction = frontend::GeneratePCH; break;
1099     case OPT_emit_pth:
1100       Opts.ProgramAction = frontend::GeneratePTH; break;
1101     case OPT_init_only:
1102       Opts.ProgramAction = frontend::InitOnly; break;
1103     case OPT_fsyntax_only:
1104       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1105     case OPT_module_file_info:
1106       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1107     case OPT_verify_pch:
1108       Opts.ProgramAction = frontend::VerifyPCH; break;
1109     case OPT_print_decl_contexts:
1110       Opts.ProgramAction = frontend::PrintDeclContext; break;
1111     case OPT_print_preamble:
1112       Opts.ProgramAction = frontend::PrintPreamble; break;
1113     case OPT_E:
1114       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1115     case OPT_rewrite_macros:
1116       Opts.ProgramAction = frontend::RewriteMacros; break;
1117     case OPT_rewrite_objc:
1118       Opts.ProgramAction = frontend::RewriteObjC; break;
1119     case OPT_rewrite_test:
1120       Opts.ProgramAction = frontend::RewriteTest; break;
1121     case OPT_analyze:
1122       Opts.ProgramAction = frontend::RunAnalysis; break;
1123     case OPT_migrate:
1124       Opts.ProgramAction = frontend::MigrateSource; break;
1125     case OPT_Eonly:
1126       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1127     }
1128   }
1129 
1130   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1131     Opts.Plugins.emplace_back(A->getValue(0));
1132     Opts.ProgramAction = frontend::PluginAction;
1133     Opts.ActionName = A->getValue();
1134   }
1135   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1136   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1137     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1138 
1139   for (const std::string &Arg :
1140          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1141     std::string BlockName;
1142     unsigned MajorVersion;
1143     unsigned MinorVersion;
1144     bool Hashed;
1145     std::string UserInfo;
1146     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1147                                         MinorVersion, Hashed, UserInfo)) {
1148       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1149 
1150       continue;
1151     }
1152 
1153     // Add the testing module file extension.
1154     Opts.ModuleFileExtensions.push_back(
1155       new TestModuleFileExtension(BlockName, MajorVersion, MinorVersion,
1156                                   Hashed, UserInfo));
1157   }
1158 
1159   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1160     Opts.CodeCompletionAt =
1161       ParsedSourceLocation::FromString(A->getValue());
1162     if (Opts.CodeCompletionAt.FileName.empty())
1163       Diags.Report(diag::err_drv_invalid_value)
1164         << A->getAsString(Args) << A->getValue();
1165   }
1166   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1167 
1168   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1169   Opts.Plugins = Args.getAllArgValues(OPT_load);
1170   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1171   Opts.ShowHelp = Args.hasArg(OPT_help);
1172   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1173   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1174   Opts.ShowVersion = Args.hasArg(OPT_version);
1175   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1176   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1177   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1178   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1179   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1180   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1181   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1182   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1183   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1184   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1185   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1186   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1187   Opts.ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
1188   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1189   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1190 
1191   Opts.CodeCompleteOpts.IncludeMacros
1192     = Args.hasArg(OPT_code_completion_macros);
1193   Opts.CodeCompleteOpts.IncludeCodePatterns
1194     = Args.hasArg(OPT_code_completion_patterns);
1195   Opts.CodeCompleteOpts.IncludeGlobals
1196     = !Args.hasArg(OPT_no_code_completion_globals);
1197   Opts.CodeCompleteOpts.IncludeBriefComments
1198     = Args.hasArg(OPT_code_completion_brief_comments);
1199 
1200   Opts.OverrideRecordLayoutsFile
1201     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1202   Opts.AuxTriple =
1203       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1204   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1205 
1206   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1207                                      OPT_arcmt_modify,
1208                                      OPT_arcmt_migrate)) {
1209     switch (A->getOption().getID()) {
1210     default:
1211       llvm_unreachable("missed a case");
1212     case OPT_arcmt_check:
1213       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1214       break;
1215     case OPT_arcmt_modify:
1216       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1217       break;
1218     case OPT_arcmt_migrate:
1219       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1220       break;
1221     }
1222   }
1223   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1224   Opts.ARCMTMigrateReportOut
1225     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1226   Opts.ARCMTMigrateEmitARCErrors
1227     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1228 
1229   if (Args.hasArg(OPT_objcmt_migrate_literals))
1230     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1231   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1232     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1233   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1234     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1235   if (Args.hasArg(OPT_objcmt_migrate_property))
1236     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1237   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1238     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1239   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1240     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1241   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1242     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1243   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1244     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1245   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1246     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1247   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1248     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1249   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1250     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1251   if (Args.hasArg(OPT_objcmt_atomic_property))
1252     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1253   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1254     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1255   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1256     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1257   if (Args.hasArg(OPT_objcmt_migrate_all))
1258     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1259 
1260   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1261 
1262   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1263       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1264     Diags.Report(diag::err_drv_argument_not_allowed_with)
1265       << "ARC migration" << "ObjC migration";
1266   }
1267 
1268   InputKind DashX = IK_None;
1269   if (const Arg *A = Args.getLastArg(OPT_x)) {
1270     DashX = llvm::StringSwitch<InputKind>(A->getValue())
1271       .Case("c", IK_C)
1272       .Case("cl", IK_OpenCL)
1273       .Case("cuda", IK_CUDA)
1274       .Case("c++", IK_CXX)
1275       .Case("objective-c", IK_ObjC)
1276       .Case("objective-c++", IK_ObjCXX)
1277       .Case("cpp-output", IK_PreprocessedC)
1278       .Case("assembler-with-cpp", IK_Asm)
1279       .Case("c++-cpp-output", IK_PreprocessedCXX)
1280       .Case("cuda-cpp-output", IK_PreprocessedCuda)
1281       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
1282       .Case("objc-cpp-output", IK_PreprocessedObjC)
1283       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
1284       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
1285       .Case("c-header", IK_C)
1286       .Case("cl-header", IK_OpenCL)
1287       .Case("objective-c-header", IK_ObjC)
1288       .Case("c++-header", IK_CXX)
1289       .Case("objective-c++-header", IK_ObjCXX)
1290       .Cases("ast", "pcm", IK_AST)
1291       .Case("ir", IK_LLVM_IR)
1292       .Default(IK_None);
1293     if (DashX == IK_None)
1294       Diags.Report(diag::err_drv_invalid_value)
1295         << A->getAsString(Args) << A->getValue();
1296   }
1297 
1298   // '-' is the default input if none is given.
1299   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1300   Opts.Inputs.clear();
1301   if (Inputs.empty())
1302     Inputs.push_back("-");
1303   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1304     InputKind IK = DashX;
1305     if (IK == IK_None) {
1306       IK = FrontendOptions::getInputKindForExtension(
1307         StringRef(Inputs[i]).rsplit('.').second);
1308       // FIXME: Remove this hack.
1309       if (i == 0)
1310         DashX = IK;
1311     }
1312     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1313   }
1314 
1315   return DashX;
1316 }
1317 
1318 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1319                                                  void *MainAddr) {
1320   std::string ClangExecutable =
1321       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1322   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1323 
1324   // Compute the path to the resource directory.
1325   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1326   SmallString<128> P(Dir);
1327   if (ClangResourceDir != "")
1328     llvm::sys::path::append(P, ClangResourceDir);
1329   else
1330     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1331                             "clang", CLANG_VERSION_STRING);
1332 
1333   return P.str();
1334 }
1335 
1336 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
1337   using namespace options;
1338   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1339   Opts.Verbose = Args.hasArg(OPT_v);
1340   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1341   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1342   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1343   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1344     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1345   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1346   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
1347   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1348   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1349   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1350   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1351   Opts.ModuleCachePruneInterval =
1352       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1353   Opts.ModuleCachePruneAfter =
1354       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1355   Opts.ModulesValidateOncePerBuildSession =
1356       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1357   Opts.BuildSessionTimestamp =
1358       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1359   Opts.ModulesValidateSystemHeaders =
1360       Args.hasArg(OPT_fmodules_validate_system_headers);
1361   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1362     Opts.ModuleFormat = A->getValue();
1363 
1364   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1365     StringRef MacroDef = A->getValue();
1366     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
1367   }
1368 
1369   // Add -I..., -F..., and -index-header-map options in order.
1370   bool IsIndexHeaderMap = false;
1371   bool IsSysrootSpecified =
1372       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1373   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1374     if (A->getOption().matches(OPT_index_header_map)) {
1375       // -index-header-map applies to the next -I or -F.
1376       IsIndexHeaderMap = true;
1377       continue;
1378     }
1379 
1380     frontend::IncludeDirGroup Group =
1381         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1382 
1383     bool IsFramework = A->getOption().matches(OPT_F);
1384     std::string Path = A->getValue();
1385 
1386     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1387       SmallString<32> Buffer;
1388       llvm::sys::path::append(Buffer, Opts.Sysroot,
1389                               llvm::StringRef(A->getValue()).substr(1));
1390       Path = Buffer.str();
1391     }
1392 
1393     Opts.AddPath(Path.c_str(), Group, IsFramework,
1394                  /*IgnoreSysroot*/ true);
1395     IsIndexHeaderMap = false;
1396   }
1397 
1398   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1399   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1400   for (const Arg *A :
1401        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1402     if (A->getOption().matches(OPT_iprefix))
1403       Prefix = A->getValue();
1404     else if (A->getOption().matches(OPT_iwithprefix))
1405       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1406     else
1407       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1408   }
1409 
1410   for (const Arg *A : Args.filtered(OPT_idirafter))
1411     Opts.AddPath(A->getValue(), frontend::After, false, true);
1412   for (const Arg *A : Args.filtered(OPT_iquote))
1413     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1414   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1415     Opts.AddPath(A->getValue(), frontend::System, false,
1416                  !A->getOption().matches(OPT_iwithsysroot));
1417   for (const Arg *A : Args.filtered(OPT_iframework))
1418     Opts.AddPath(A->getValue(), frontend::System, true, true);
1419 
1420   // Add the paths for the various language specific isystem flags.
1421   for (const Arg *A : Args.filtered(OPT_c_isystem))
1422     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1423   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1424     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1425   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1426     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1427   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1428     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1429 
1430   // Add the internal paths from a driver that detects standard include paths.
1431   for (const Arg *A :
1432        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1433     frontend::IncludeDirGroup Group = frontend::System;
1434     if (A->getOption().matches(OPT_internal_externc_isystem))
1435       Group = frontend::ExternCSystem;
1436     Opts.AddPath(A->getValue(), Group, false, true);
1437   }
1438 
1439   // Add the path prefixes which are implicitly treated as being system headers.
1440   for (const Arg *A :
1441        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1442     Opts.AddSystemHeaderPrefix(
1443         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1444 
1445   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1446     Opts.AddVFSOverlayFile(A->getValue());
1447 }
1448 
1449 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1450                                          const llvm::Triple &T,
1451                                          LangStandard::Kind LangStd) {
1452   // Set some properties which depend solely on the input kind; it would be nice
1453   // to move these to the language standard, and have the driver resolve the
1454   // input kind + language standard.
1455   if (IK == IK_Asm) {
1456     Opts.AsmPreprocessor = 1;
1457   } else if (IK == IK_ObjC ||
1458              IK == IK_ObjCXX ||
1459              IK == IK_PreprocessedObjC ||
1460              IK == IK_PreprocessedObjCXX) {
1461     Opts.ObjC1 = Opts.ObjC2 = 1;
1462   }
1463 
1464   if (LangStd == LangStandard::lang_unspecified) {
1465     // Based on the base language, pick one.
1466     switch (IK) {
1467     case IK_None:
1468     case IK_AST:
1469     case IK_LLVM_IR:
1470       llvm_unreachable("Invalid input kind!");
1471     case IK_OpenCL:
1472       LangStd = LangStandard::lang_opencl;
1473       break;
1474     case IK_CUDA:
1475     case IK_PreprocessedCuda:
1476       LangStd = LangStandard::lang_cuda;
1477       break;
1478     case IK_Asm:
1479     case IK_C:
1480     case IK_PreprocessedC:
1481     case IK_ObjC:
1482     case IK_PreprocessedObjC:
1483       // The PS4 uses C99 as the default C standard.
1484       if (T.isPS4())
1485         LangStd = LangStandard::lang_gnu99;
1486       else
1487         LangStd = LangStandard::lang_gnu11;
1488       break;
1489     case IK_CXX:
1490     case IK_PreprocessedCXX:
1491     case IK_ObjCXX:
1492     case IK_PreprocessedObjCXX:
1493       LangStd = LangStandard::lang_gnucxx98;
1494       break;
1495     }
1496   }
1497 
1498   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1499   Opts.LineComment = Std.hasLineComments();
1500   Opts.C99 = Std.isC99();
1501   Opts.C11 = Std.isC11();
1502   Opts.CPlusPlus = Std.isCPlusPlus();
1503   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1504   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1505   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1506   Opts.Digraphs = Std.hasDigraphs();
1507   Opts.GNUMode = Std.isGNUMode();
1508   Opts.GNUInline = Std.isC89();
1509   Opts.HexFloats = Std.hasHexFloats();
1510   Opts.ImplicitInt = Std.hasImplicitInt();
1511 
1512   // Set OpenCL Version.
1513   Opts.OpenCL = LangStd == LangStandard::lang_opencl || IK == IK_OpenCL;
1514   if (LangStd == LangStandard::lang_opencl)
1515     Opts.OpenCLVersion = 100;
1516   else if (LangStd == LangStandard::lang_opencl11)
1517     Opts.OpenCLVersion = 110;
1518   else if (LangStd == LangStandard::lang_opencl12)
1519     Opts.OpenCLVersion = 120;
1520   else if (LangStd == LangStandard::lang_opencl20)
1521     Opts.OpenCLVersion = 200;
1522 
1523   // OpenCL has some additional defaults.
1524   if (Opts.OpenCL) {
1525     Opts.AltiVec = 0;
1526     Opts.ZVector = 0;
1527     Opts.CXXOperatorNames = 1;
1528     Opts.LaxVectorConversions = 0;
1529     Opts.DefaultFPContract = 1;
1530     Opts.NativeHalfType = 1;
1531     Opts.NativeHalfArgsAndReturns = 1;
1532   }
1533 
1534   Opts.CUDA = IK == IK_CUDA || IK == IK_PreprocessedCuda ||
1535               LangStd == LangStandard::lang_cuda;
1536 
1537   // OpenCL and C++ both have bool, true, false keywords.
1538   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1539 
1540   // OpenCL has half keyword
1541   Opts.Half = Opts.OpenCL;
1542 
1543   // C++ has wchar_t keyword.
1544   Opts.WChar = Opts.CPlusPlus;
1545 
1546   Opts.GNUKeywords = Opts.GNUMode;
1547   Opts.CXXOperatorNames = Opts.CPlusPlus;
1548 
1549   Opts.DollarIdents = !Opts.AsmPreprocessor;
1550 }
1551 
1552 /// Attempt to parse a visibility value out of the given argument.
1553 static Visibility parseVisibility(Arg *arg, ArgList &args,
1554                                   DiagnosticsEngine &diags) {
1555   StringRef value = arg->getValue();
1556   if (value == "default") {
1557     return DefaultVisibility;
1558   } else if (value == "hidden" || value == "internal") {
1559     return HiddenVisibility;
1560   } else if (value == "protected") {
1561     // FIXME: diagnose if target does not support protected visibility
1562     return ProtectedVisibility;
1563   }
1564 
1565   diags.Report(diag::err_drv_invalid_value)
1566     << arg->getAsString(args) << value;
1567   return DefaultVisibility;
1568 }
1569 
1570 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1571                           const TargetOptions &TargetOpts,
1572                           DiagnosticsEngine &Diags) {
1573   // FIXME: Cleanup per-file based stuff.
1574   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1575   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1576     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1577 #define LANGSTANDARD(id, name, desc, features) \
1578       .Case(name, LangStandard::lang_##id)
1579 #include "clang/Frontend/LangStandards.def"
1580       .Default(LangStandard::lang_unspecified);
1581     if (LangStd == LangStandard::lang_unspecified)
1582       Diags.Report(diag::err_drv_invalid_value)
1583         << A->getAsString(Args) << A->getValue();
1584     else {
1585       // Valid standard, check to make sure language and standard are
1586       // compatible.
1587       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1588       switch (IK) {
1589       case IK_C:
1590       case IK_ObjC:
1591       case IK_PreprocessedC:
1592       case IK_PreprocessedObjC:
1593         if (!(Std.isC89() || Std.isC99()))
1594           Diags.Report(diag::err_drv_argument_not_allowed_with)
1595             << A->getAsString(Args) << "C/ObjC";
1596         break;
1597       case IK_CXX:
1598       case IK_ObjCXX:
1599       case IK_PreprocessedCXX:
1600       case IK_PreprocessedObjCXX:
1601         if (!Std.isCPlusPlus())
1602           Diags.Report(diag::err_drv_argument_not_allowed_with)
1603             << A->getAsString(Args) << "C++/ObjC++";
1604         break;
1605       case IK_OpenCL:
1606         Diags.Report(diag::err_drv_argument_not_allowed_with)
1607           << A->getAsString(Args) << "OpenCL";
1608         break;
1609       case IK_CUDA:
1610       case IK_PreprocessedCuda:
1611         if (!Std.isCPlusPlus())
1612           Diags.Report(diag::err_drv_argument_not_allowed_with)
1613             << A->getAsString(Args) << "CUDA";
1614         break;
1615       default:
1616         break;
1617       }
1618     }
1619   }
1620 
1621   // -cl-std only applies for OpenCL language standards.
1622   // Override the -std option in this case.
1623   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1624     LangStandard::Kind OpenCLLangStd
1625     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1626     .Case("CL", LangStandard::lang_opencl)
1627     .Case("CL1.1", LangStandard::lang_opencl11)
1628     .Case("CL1.2", LangStandard::lang_opencl12)
1629     .Case("CL2.0", LangStandard::lang_opencl20)
1630     .Default(LangStandard::lang_unspecified);
1631 
1632     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1633       Diags.Report(diag::err_drv_invalid_value)
1634       << A->getAsString(Args) << A->getValue();
1635     }
1636     else
1637       LangStd = OpenCLLangStd;
1638   }
1639 
1640   llvm::Triple T(TargetOpts.Triple);
1641   CompilerInvocation::setLangDefaults(Opts, IK, T, LangStd);
1642 
1643   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1644   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1645   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1646   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1647   // name, as it doesn't seem a useful distinction.
1648   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1649                                   Opts.GNUKeywords);
1650 
1651   if (Args.hasArg(OPT_fno_operator_names))
1652     Opts.CXXOperatorNames = 0;
1653 
1654   if (Args.hasArg(OPT_fcuda_is_device))
1655     Opts.CUDAIsDevice = 1;
1656 
1657   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1658     Opts.CUDAAllowVariadicFunctions = 1;
1659 
1660   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1661     Opts.CUDAHostDeviceConstexpr = 0;
1662 
1663   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1664     Opts.CUDADeviceFlushDenormalsToZero = 1;
1665 
1666   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1667     Opts.CUDADeviceApproxTranscendentals = 1;
1668 
1669   if (Opts.ObjC1) {
1670     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1671       StringRef value = arg->getValue();
1672       if (Opts.ObjCRuntime.tryParse(value))
1673         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1674     }
1675 
1676     if (Args.hasArg(OPT_fobjc_gc_only))
1677       Opts.setGC(LangOptions::GCOnly);
1678     else if (Args.hasArg(OPT_fobjc_gc))
1679       Opts.setGC(LangOptions::HybridGC);
1680     else if (Args.hasArg(OPT_fobjc_arc)) {
1681       Opts.ObjCAutoRefCount = 1;
1682       if (!Opts.ObjCRuntime.allowsARC())
1683         Diags.Report(diag::err_arc_unsupported_on_runtime);
1684     }
1685 
1686     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
1687     // whether the feature is actually enabled.  This is predominantly
1688     // determined by -fobjc-runtime, but we allow it to be overridden
1689     // from the command line for testing purposes.
1690     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1691       Opts.ObjCWeakRuntime = 1;
1692     else
1693       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
1694 
1695     // ObjCWeak determines whether __weak is actually enabled.
1696     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
1697     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
1698       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
1699         assert(!Opts.ObjCWeak);
1700       } else if (Opts.getGC() != LangOptions::NonGC) {
1701         Diags.Report(diag::err_objc_weak_with_gc);
1702       } else if (!Opts.ObjCWeakRuntime) {
1703         Diags.Report(diag::err_objc_weak_unsupported);
1704       } else {
1705         Opts.ObjCWeak = 1;
1706       }
1707     } else if (Opts.ObjCAutoRefCount) {
1708       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
1709     }
1710 
1711     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1712       Opts.ObjCInferRelatedResultType = 0;
1713 
1714     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1715       Opts.ObjCSubscriptingLegacyRuntime =
1716         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1717   }
1718 
1719   if (Args.hasArg(OPT_fgnu89_inline)) {
1720     if (Opts.CPlusPlus)
1721       Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fgnu89-inline"
1722                                                             << "C++/ObjC++";
1723     else
1724       Opts.GNUInline = 1;
1725   }
1726 
1727   if (Args.hasArg(OPT_fapple_kext)) {
1728     if (!Opts.CPlusPlus)
1729       Diags.Report(diag::warn_c_kext);
1730     else
1731       Opts.AppleKext = 1;
1732   }
1733 
1734   if (Args.hasArg(OPT_print_ivar_layout))
1735     Opts.ObjCGCBitmapPrint = 1;
1736   if (Args.hasArg(OPT_fno_constant_cfstrings))
1737     Opts.NoConstantCFStrings = 1;
1738 
1739   if (Args.hasArg(OPT_faltivec))
1740     Opts.AltiVec = 1;
1741 
1742   if (Args.hasArg(OPT_fzvector))
1743     Opts.ZVector = 1;
1744 
1745   if (Args.hasArg(OPT_pthread))
1746     Opts.POSIXThreads = 1;
1747 
1748   // The value-visibility mode defaults to "default".
1749   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1750     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1751   } else {
1752     Opts.setValueVisibilityMode(DefaultVisibility);
1753   }
1754 
1755   // The type-visibility mode defaults to the value-visibility mode.
1756   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1757     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1758   } else {
1759     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1760   }
1761 
1762   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1763     Opts.InlineVisibilityHidden = 1;
1764 
1765   if (Args.hasArg(OPT_ftrapv)) {
1766     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1767     // Set the handler, if one is specified.
1768     Opts.OverflowHandler =
1769         Args.getLastArgValue(OPT_ftrapv_handler);
1770   }
1771   else if (Args.hasArg(OPT_fwrapv))
1772     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1773 
1774   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1775   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1776   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1777   Opts.MSCompatibilityVersion = 0;
1778   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
1779     VersionTuple VT;
1780     if (VT.tryParse(A->getValue()))
1781       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
1782                                                 << A->getValue();
1783     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
1784                                   VT.getMinor().getValueOr(0) * 100000 +
1785                                   VT.getSubminor().getValueOr(0);
1786   }
1787 
1788   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1789   // is specified, or -std is set to a conforming mode.
1790   // Trigraphs are disabled by default in c++1z onwards.
1791   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
1792   Opts.Trigraphs =
1793       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
1794 
1795   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1796                                    OPT_fno_dollars_in_identifiers,
1797                                    Opts.DollarIdents);
1798   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1799   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1800   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1801   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1802   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1803                                    Opts.ConstStrings);
1804   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1805     Opts.LaxVectorConversions = 0;
1806   if (Args.hasArg(OPT_fno_threadsafe_statics))
1807     Opts.ThreadsafeStatics = 0;
1808   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1809   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1810   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1811   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1812   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
1813   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1814 
1815   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
1816   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
1817   Opts.Blocks = Args.hasArg(OPT_fblocks);
1818   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1819   Opts.Coroutines = Args.hasArg(OPT_fcoroutines);
1820   Opts.Modules = Args.hasArg(OPT_fmodules);
1821   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
1822   Opts.ModulesDeclUse =
1823       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
1824   Opts.ModulesLocalVisibility =
1825       Args.hasArg(OPT_fmodules_local_submodule_visibility);
1826   Opts.ModulesSearchAll = Opts.Modules &&
1827     !Args.hasArg(OPT_fno_modules_search_all) &&
1828     Args.hasArg(OPT_fmodules_search_all);
1829   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
1830   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
1831   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1832   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1833   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1834   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1835   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1836   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1837   if (!Opts.NoBuiltin)
1838     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
1839   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1840   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1841   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
1842   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1843   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1844   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1845   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1846   Opts.InstantiationDepth =
1847       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1848   Opts.ArrowDepth =
1849       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1850   Opts.ConstexprCallDepth =
1851       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1852   Opts.ConstexprStepLimit =
1853       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1854   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1855   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1856   Opts.NumLargeByValueCopy =
1857       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1858   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1859   Opts.ObjCConstantStringClass =
1860     Args.getLastArgValue(OPT_fconstant_string_class);
1861   Opts.ObjCDefaultSynthProperties =
1862     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1863   Opts.EncodeExtendedBlockSig =
1864     Args.hasArg(OPT_fencode_extended_block_signature);
1865   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1866   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1867   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
1868   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
1869   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1870   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1871   Opts.Static = Args.hasArg(OPT_static_define);
1872   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1873   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1874                         || Args.hasArg(OPT_fdump_record_layouts);
1875   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1876   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1877   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1878   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1879   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1880   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1881   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1882   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1883   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1884   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1885   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1886   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1887   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
1888   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
1889   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
1890   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
1891   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
1892   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
1893   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
1894   // is enabled.
1895   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
1896                             | Opts.NativeHalfArgsAndReturns;
1897   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
1898 
1899   // __declspec is enabled by default for the PS4 by the driver, and also
1900   // enabled for Microsoft Extensions or Borland Extensions, here.
1901   //
1902   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
1903   // CUDA extension, however it is required for supporting cuda_builtin_vars.h,
1904   // which uses __declspec(property). Once that has been rewritten in terms of
1905   // something more generic, remove the Opts.CUDA term here.
1906   Opts.DeclSpecKeyword =
1907       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
1908                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
1909 
1910   // For now, we only support local submodule visibility in C++ (because we
1911   // heavily depend on the ODR for merging redefinitions).
1912   if (Opts.ModulesLocalVisibility && !Opts.CPlusPlus)
1913     Diags.Report(diag::err_drv_argument_not_allowed_with)
1914         << "-fmodules-local-submodule-visibility" << "C";
1915 
1916   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1917     switch (llvm::StringSwitch<unsigned>(A->getValue())
1918       .Case("target", LangOptions::ASMM_Target)
1919       .Case("no", LangOptions::ASMM_Off)
1920       .Case("yes", LangOptions::ASMM_On)
1921       .Default(255)) {
1922     default:
1923       Diags.Report(diag::err_drv_invalid_value)
1924         << "-faddress-space-map-mangling=" << A->getValue();
1925       break;
1926     case LangOptions::ASMM_Target:
1927       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1928       break;
1929     case LangOptions::ASMM_On:
1930       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1931       break;
1932     case LangOptions::ASMM_Off:
1933       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1934       break;
1935     }
1936   }
1937 
1938   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
1939     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
1940         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
1941             A->getValue())
1942             .Case("single",
1943                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
1944             .Case("multiple",
1945                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
1946             .Case("virtual",
1947                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
1948             .Default(LangOptions::PPTMK_BestCase);
1949     if (InheritanceModel == LangOptions::PPTMK_BestCase)
1950       Diags.Report(diag::err_drv_invalid_value)
1951           << "-fms-memptr-rep=" << A->getValue();
1952 
1953     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
1954   }
1955 
1956   // Check for MS default calling conventions being specified.
1957   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
1958     LangOptions::DefaultCallingConvention DefaultCC =
1959         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
1960             A->getValue())
1961             .Case("cdecl", LangOptions::DCC_CDecl)
1962             .Case("fastcall", LangOptions::DCC_FastCall)
1963             .Case("stdcall", LangOptions::DCC_StdCall)
1964             .Case("vectorcall", LangOptions::DCC_VectorCall)
1965             .Default(LangOptions::DCC_None);
1966     if (DefaultCC == LangOptions::DCC_None)
1967       Diags.Report(diag::err_drv_invalid_value)
1968           << "-fdefault-calling-conv=" << A->getValue();
1969 
1970     llvm::Triple T(TargetOpts.Triple);
1971     llvm::Triple::ArchType Arch = T.getArch();
1972     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
1973                   DefaultCC == LangOptions::DCC_StdCall) &&
1974                  Arch != llvm::Triple::x86;
1975     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
1976                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
1977     if (emitError)
1978       Diags.Report(diag::err_drv_argument_not_allowed_with)
1979           << A->getSpelling() << T.getTriple();
1980     else
1981       Opts.setDefaultCallingConv(DefaultCC);
1982   }
1983 
1984   // -mrtd option
1985   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
1986     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
1987       Diags.Report(diag::err_drv_argument_not_allowed_with)
1988           << A->getSpelling() << "-fdefault-calling-conv";
1989     else {
1990       llvm::Triple T(TargetOpts.Triple);
1991       if (T.getArch() != llvm::Triple::x86)
1992         Diags.Report(diag::err_drv_argument_not_allowed_with)
1993             << A->getSpelling() << T.getTriple();
1994       else
1995         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
1996     }
1997   }
1998 
1999   // Check if -fopenmp is specified.
2000   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2001   Opts.OpenMPUseTLS =
2002       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2003   Opts.OpenMPIsDevice =
2004       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2005 
2006   if (Opts.OpenMP) {
2007     int Version =
2008         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2009     if (Version != 0)
2010       Opts.OpenMP = Version;
2011     // Provide diagnostic when a given target is not expected to be an OpenMP
2012     // device or host.
2013     if (!Opts.OpenMPIsDevice) {
2014       switch (T.getArch()) {
2015       default:
2016         break;
2017       // Add unsupported host targets here:
2018       case llvm::Triple::nvptx:
2019       case llvm::Triple::nvptx64:
2020         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2021             << TargetOpts.Triple;
2022         break;
2023       }
2024     }
2025   }
2026 
2027   // Get the OpenMP target triples if any.
2028   if (Arg *A = Args.getLastArg(options::OPT_fomptargets_EQ)) {
2029 
2030     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2031       llvm::Triple TT(A->getValue(i));
2032 
2033       if (TT.getArch() == llvm::Triple::UnknownArch)
2034         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2035       else
2036         Opts.OMPTargetTriples.push_back(TT);
2037     }
2038   }
2039 
2040   // Get OpenMP host file path if any and report if a non existent file is
2041   // found
2042   if (Arg *A = Args.getLastArg(options::OPT_fomp_host_ir_file_path)) {
2043     Opts.OMPHostIRFile = A->getValue();
2044     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2045       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2046           << Opts.OMPHostIRFile;
2047   }
2048 
2049   // Record whether the __DEPRECATED define was requested.
2050   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2051                                  OPT_fno_deprecated_macro,
2052                                  Opts.Deprecated);
2053 
2054   // FIXME: Eliminate this dependency.
2055   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2056        OptSize = getOptimizationLevelSize(Args);
2057   Opts.Optimize = Opt != 0;
2058   Opts.OptimizeSize = OptSize != 0;
2059 
2060   // This is the __NO_INLINE__ define, which just depends on things like the
2061   // optimization level and -fno-inline, not actually whether the backend has
2062   // inlining enabled.
2063   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
2064 
2065   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2066       Args.hasArg(OPT_cl_fast_relaxed_math);
2067   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2068       Args.hasArg(OPT_cl_finite_math_only) ||
2069       Args.hasArg(OPT_cl_fast_relaxed_math);
2070   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2071                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2072                       Args.hasArg(OPT_cl_fast_relaxed_math);
2073 
2074   Opts.RetainCommentsFromSystemHeaders =
2075       Args.hasArg(OPT_fretain_comments_from_system_headers);
2076 
2077   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2078   switch (SSP) {
2079   default:
2080     Diags.Report(diag::err_drv_invalid_value)
2081       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2082     break;
2083   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2084   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2085   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2086   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2087   }
2088 
2089   // Parse -fsanitize= arguments.
2090   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2091                       Diags, Opts.Sanitize);
2092   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2093   Opts.SanitizeAddressFieldPadding =
2094       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2095   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2096 }
2097 
2098 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2099                                   FileManager &FileMgr,
2100                                   DiagnosticsEngine &Diags) {
2101   using namespace options;
2102   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2103   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2104   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2105       Opts.TokenCache = A->getValue();
2106   else
2107     Opts.TokenCache = Opts.ImplicitPTHInclude;
2108   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2109   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2110   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2111 
2112   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2113   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2114     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2115 
2116   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2117     StringRef Value(A->getValue());
2118     size_t Comma = Value.find(',');
2119     unsigned Bytes = 0;
2120     unsigned EndOfLine = 0;
2121 
2122     if (Comma == StringRef::npos ||
2123         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2124         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2125       Diags.Report(diag::err_drv_preamble_format);
2126     else {
2127       Opts.PrecompiledPreambleBytes.first = Bytes;
2128       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2129     }
2130   }
2131 
2132   // Add macros from the command line.
2133   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2134     if (A->getOption().matches(OPT_D))
2135       Opts.addMacroDef(A->getValue());
2136     else
2137       Opts.addMacroUndef(A->getValue());
2138   }
2139 
2140   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2141 
2142   // Add the ordered list of -includes.
2143   for (const Arg *A : Args.filtered(OPT_include))
2144     Opts.Includes.emplace_back(A->getValue());
2145 
2146   for (const Arg *A : Args.filtered(OPT_chain_include))
2147     Opts.ChainedIncludes.emplace_back(A->getValue());
2148 
2149   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2150     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2151 
2152     if (Split.second.empty()) {
2153       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2154       continue;
2155     }
2156 
2157     Opts.addRemappedFile(Split.first, Split.second);
2158   }
2159 
2160   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2161     StringRef Name = A->getValue();
2162     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2163       .Case("libc++", ARCXX_libcxx)
2164       .Case("libstdc++", ARCXX_libstdcxx)
2165       .Case("none", ARCXX_nolib)
2166       .Default(~0U);
2167     if (Library == ~0U)
2168       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2169     else
2170       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2171   }
2172 }
2173 
2174 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2175                                         ArgList &Args,
2176                                         frontend::ActionKind Action) {
2177   using namespace options;
2178 
2179   switch (Action) {
2180   case frontend::ASTDeclList:
2181   case frontend::ASTDump:
2182   case frontend::ASTPrint:
2183   case frontend::ASTView:
2184   case frontend::EmitAssembly:
2185   case frontend::EmitBC:
2186   case frontend::EmitHTML:
2187   case frontend::EmitLLVM:
2188   case frontend::EmitLLVMOnly:
2189   case frontend::EmitCodeGenOnly:
2190   case frontend::EmitObj:
2191   case frontend::FixIt:
2192   case frontend::GenerateModule:
2193   case frontend::GeneratePCH:
2194   case frontend::GeneratePTH:
2195   case frontend::ParseSyntaxOnly:
2196   case frontend::ModuleFileInfo:
2197   case frontend::VerifyPCH:
2198   case frontend::PluginAction:
2199   case frontend::PrintDeclContext:
2200   case frontend::RewriteObjC:
2201   case frontend::RewriteTest:
2202   case frontend::RunAnalysis:
2203   case frontend::MigrateSource:
2204     Opts.ShowCPP = 0;
2205     break;
2206 
2207   case frontend::DumpRawTokens:
2208   case frontend::DumpTokens:
2209   case frontend::InitOnly:
2210   case frontend::PrintPreamble:
2211   case frontend::PrintPreprocessedInput:
2212   case frontend::RewriteMacros:
2213   case frontend::RunPreprocessorOnly:
2214     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2215     break;
2216   }
2217 
2218   Opts.ShowComments = Args.hasArg(OPT_C);
2219   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2220   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2221   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2222   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2223   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2224 }
2225 
2226 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2227                             DiagnosticsEngine &Diags) {
2228   using namespace options;
2229   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2230   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2231     StringRef Value = A->getValue();
2232     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2233                                  .Case("default", llvm::EABI::Default)
2234                                  .Case("4", llvm::EABI::EABI4)
2235                                  .Case("5", llvm::EABI::EABI5)
2236                                  .Case("gnu", llvm::EABI::GNU)
2237                                  .Default(llvm::EABI::Unknown);
2238     if (EABIVersion == llvm::EABI::Unknown)
2239       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2240                                                 << Value;
2241     else
2242       Opts.EABIVersion = Value;
2243   }
2244   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2245   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2246   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2247   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2248   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2249   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2250   // Use the default target triple if unspecified.
2251   if (Opts.Triple.empty())
2252     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2253 }
2254 
2255 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2256                                         const char *const *ArgBegin,
2257                                         const char *const *ArgEnd,
2258                                         DiagnosticsEngine &Diags) {
2259   bool Success = true;
2260 
2261   // Parse the arguments.
2262   std::unique_ptr<OptTable> Opts(createDriverOptTable());
2263   const unsigned IncludedFlagsBitmask = options::CC1Option;
2264   unsigned MissingArgIndex, MissingArgCount;
2265   InputArgList Args =
2266       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2267                       MissingArgCount, IncludedFlagsBitmask);
2268   LangOptions &LangOpts = *Res.getLangOpts();
2269 
2270   // Check for missing argument error.
2271   if (MissingArgCount) {
2272     Diags.Report(diag::err_drv_missing_argument)
2273         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2274     Success = false;
2275   }
2276 
2277   // Issue errors on unknown arguments.
2278   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2279     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2280     Success = false;
2281   }
2282 
2283   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2284   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2285   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2286   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2287                                  false /*DefaultDiagColor*/);
2288   ParseCommentArgs(LangOpts.CommentOpts, Args);
2289   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2290   // FIXME: We shouldn't have to pass the DashX option around here
2291   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags);
2292   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2293   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2294                               Res.getTargetOpts());
2295   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args);
2296   if (DashX == IK_AST || DashX == IK_LLVM_IR) {
2297     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2298     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2299     // what the input type is.
2300     if (Args.hasArg(OPT_fobjc_arc))
2301       LangOpts.ObjCAutoRefCount = 1;
2302     // PIClevel and PIELevel are needed during code generation and this should be
2303     // set regardless of the input type.
2304     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2305     LangOpts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
2306     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2307                         Diags, LangOpts.Sanitize);
2308   } else {
2309     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2310     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(), Diags);
2311     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2312       LangOpts.ObjCExceptions = 1;
2313   }
2314 
2315   if (LangOpts.CUDA) {
2316     // During CUDA device-side compilation, the aux triple is the
2317     // triple used for host compilation.
2318     if (LangOpts.CUDAIsDevice)
2319       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2320 
2321     // Set default FP_CONTRACT to FAST.
2322     if (!Args.hasArg(OPT_ffp_contract))
2323       Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
2324   }
2325 
2326   // FIXME: Override value name discarding when asan or msan is used because the
2327   // backend passes depend on the name of the alloca in order to print out
2328   // names.
2329   Res.getCodeGenOpts().DiscardValueNames &=
2330       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2331       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2332 
2333   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2334   // PCH file and find the original header name. Remove the need to do that in
2335   // ParsePreprocessorArgs and remove the FileManager
2336   // parameters from the function and the "FileManager.h" #include.
2337   FileManager FileMgr(Res.getFileSystemOpts());
2338   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags);
2339   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2340                               Res.getFrontendOpts().ProgramAction);
2341   return Success;
2342 }
2343 
2344 namespace {
2345 
2346   class ModuleSignature {
2347     SmallVector<uint64_t, 16> Data;
2348     unsigned CurBit;
2349     uint64_t CurValue;
2350 
2351   public:
2352     ModuleSignature() : CurBit(0), CurValue(0) { }
2353 
2354     void add(uint64_t Value, unsigned Bits);
2355     void add(StringRef Value);
2356     void flush();
2357 
2358     llvm::APInt getAsInteger() const;
2359   };
2360 }
2361 
2362 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
2363   CurValue |= Value << CurBit;
2364   if (CurBit + NumBits < 64) {
2365     CurBit += NumBits;
2366     return;
2367   }
2368 
2369   // Add the current word.
2370   Data.push_back(CurValue);
2371 
2372   if (CurBit)
2373     CurValue = Value >> (64-CurBit);
2374   else
2375     CurValue = 0;
2376   CurBit = (CurBit+NumBits) & 63;
2377 }
2378 
2379 void ModuleSignature::flush() {
2380   if (CurBit == 0)
2381     return;
2382 
2383   Data.push_back(CurValue);
2384   CurBit = 0;
2385   CurValue = 0;
2386 }
2387 
2388 void ModuleSignature::add(StringRef Value) {
2389   for (auto &c : Value)
2390     add(c, 8);
2391 }
2392 
2393 llvm::APInt ModuleSignature::getAsInteger() const {
2394   return llvm::APInt(Data.size() * 64, Data);
2395 }
2396 
2397 std::string CompilerInvocation::getModuleHash() const {
2398   // Note: For QoI reasons, the things we use as a hash here should all be
2399   // dumped via the -module-info flag.
2400   using llvm::hash_code;
2401   using llvm::hash_value;
2402   using llvm::hash_combine;
2403 
2404   // Start the signature with the compiler version.
2405   // FIXME: We'd rather use something more cryptographically sound than
2406   // CityHash, but this will do for now.
2407   hash_code code = hash_value(getClangFullRepositoryVersion());
2408 
2409   // Extend the signature with the language options
2410 #define LANGOPT(Name, Bits, Default, Description) \
2411    code = hash_combine(code, LangOpts->Name);
2412 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2413   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2414 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2415 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2416 #include "clang/Basic/LangOptions.def"
2417 
2418   for (StringRef Feature : LangOpts->ModuleFeatures)
2419     code = hash_combine(code, Feature);
2420 
2421   // Extend the signature with the target options.
2422   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2423                       TargetOpts->ABI);
2424   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2425     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2426 
2427   // Extend the signature with preprocessor options.
2428   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2429   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2430   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2431 
2432   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2433             I = getPreprocessorOpts().Macros.begin(),
2434          IEnd = getPreprocessorOpts().Macros.end();
2435        I != IEnd; ++I) {
2436     // If we're supposed to ignore this macro for the purposes of modules,
2437     // don't put it into the hash.
2438     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2439       // Check whether we're ignoring this macro.
2440       StringRef MacroDef = I->first;
2441       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
2442         continue;
2443     }
2444 
2445     code = hash_combine(code, I->first, I->second);
2446   }
2447 
2448   // Extend the signature with the sysroot and other header search options.
2449   code = hash_combine(code, hsOpts.Sysroot,
2450                       hsOpts.ModuleFormat,
2451                       hsOpts.UseDebugInfo,
2452                       hsOpts.UseBuiltinIncludes,
2453                       hsOpts.UseStandardSystemIncludes,
2454                       hsOpts.UseStandardCXXIncludes,
2455                       hsOpts.UseLibcxx);
2456   code = hash_combine(code, hsOpts.ResourceDir);
2457 
2458   // Extend the signature with the user build path.
2459   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2460 
2461   // Extend the signature with the module file extensions.
2462   const FrontendOptions &frontendOpts = getFrontendOpts();
2463   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2464     code = ext->hashExtension(code);
2465   }
2466 
2467   // Darwin-specific hack: if we have a sysroot, use the contents and
2468   // modification time of
2469   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
2470   // as part of the module hash.
2471   if (!hsOpts.Sysroot.empty()) {
2472     SmallString<128> systemVersionFile;
2473     systemVersionFile += hsOpts.Sysroot;
2474     llvm::sys::path::append(systemVersionFile, "System");
2475     llvm::sys::path::append(systemVersionFile, "Library");
2476     llvm::sys::path::append(systemVersionFile, "CoreServices");
2477     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
2478 
2479     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer =
2480         llvm::MemoryBuffer::getFile(systemVersionFile);
2481     if (buffer) {
2482       code = hash_combine(code, buffer.get()->getBuffer());
2483 
2484       struct stat statBuf;
2485       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
2486         code = hash_combine(code, statBuf.st_mtime);
2487     }
2488   }
2489 
2490   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2491 }
2492 
2493 namespace clang {
2494 
2495 template<typename IntTy>
2496 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2497                                     IntTy Default,
2498                                     DiagnosticsEngine *Diags) {
2499   IntTy Res = Default;
2500   if (Arg *A = Args.getLastArg(Id)) {
2501     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2502       if (Diags)
2503         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2504                                                        << A->getValue();
2505     }
2506   }
2507   return Res;
2508 }
2509 
2510 
2511 // Declared in clang/Frontend/Utils.h.
2512 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2513                        DiagnosticsEngine *Diags) {
2514   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2515 }
2516 
2517 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2518                                uint64_t Default,
2519                                DiagnosticsEngine *Diags) {
2520   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2521 }
2522 
2523 void BuryPointer(const void *Ptr) {
2524   // This function may be called only a small fixed amount of times per each
2525   // invocation, otherwise we do actually have a leak which we want to report.
2526   // If this function is called more than kGraveYardMaxSize times, the pointers
2527   // will not be properly buried and a leak detector will report a leak, which
2528   // is what we want in such case.
2529   static const size_t kGraveYardMaxSize = 16;
2530   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2531   static std::atomic<unsigned> GraveYardSize;
2532   unsigned Idx = GraveYardSize++;
2533   if (Idx >= kGraveYardMaxSize)
2534     return;
2535   GraveYard[Idx] = Ptr;
2536 }
2537 
2538 IntrusiveRefCntPtr<vfs::FileSystem>
2539 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2540                                 DiagnosticsEngine &Diags) {
2541   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2542     return vfs::getRealFileSystem();
2543 
2544   IntrusiveRefCntPtr<vfs::OverlayFileSystem>
2545     Overlay(new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
2546   // earlier vfs files are on the bottom
2547   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2548     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2549         llvm::MemoryBuffer::getFile(File);
2550     if (!Buffer) {
2551       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2552       return IntrusiveRefCntPtr<vfs::FileSystem>();
2553     }
2554 
2555     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2556         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2557     if (!FS.get()) {
2558       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2559       return IntrusiveRefCntPtr<vfs::FileSystem>();
2560     }
2561     Overlay->pushOverlay(FS);
2562   }
2563   return Overlay;
2564 }
2565 } // end namespace clang
2566