1 //===--- CompilerInvocation.cpp -------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/Frontend/CompilerInvocation.h"
11 #include "TestModuleFileExtension.h"
12 #include "clang/Basic/Builtins.h"
13 #include "clang/Basic/FileManager.h"
14 #include "clang/Basic/Version.h"
15 #include "clang/Config/config.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/Options.h"
18 #include "clang/Driver/Util.h"
19 #include "clang/Frontend/FrontendDiagnostic.h"
20 #include "clang/Frontend/LangStandard.h"
21 #include "clang/Frontend/Utils.h"
22 #include "clang/Lex/HeaderSearchOptions.h"
23 #include "clang/Lex/PreprocessorOptions.h"
24 #include "clang/Serialization/ASTReader.h"
25 #include "clang/Serialization/ModuleFileExtension.h"
26 #include "llvm/ADT/Hashing.h"
27 #include "llvm/ADT/STLExtras.h"
28 #include "llvm/ADT/SmallVector.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/ADT/StringSwitch.h"
31 #include "llvm/ADT/Triple.h"
32 #include "llvm/Linker/Linker.h"
33 #include "llvm/Option/Arg.h"
34 #include "llvm/Option/ArgList.h"
35 #include "llvm/Option/OptTable.h"
36 #include "llvm/Option/Option.h"
37 #include "llvm/ProfileData/InstrProfReader.h"
38 #include "llvm/Support/CodeGen.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/FileSystem.h"
41 #include "llvm/Support/Host.h"
42 #include "llvm/Support/Path.h"
43 #include "llvm/Support/Process.h"
44 #include "llvm/Target/TargetOptions.h"
45 #include "llvm/Support/ScopedPrinter.h"
46 #include <atomic>
47 #include <memory>
48 #include <sys/stat.h>
49 #include <system_error>
50 using namespace clang;
51 
52 //===----------------------------------------------------------------------===//
53 // Initialization.
54 //===----------------------------------------------------------------------===//
55 
56 CompilerInvocationBase::CompilerInvocationBase()
57   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
58     DiagnosticOpts(new DiagnosticOptions()),
59     HeaderSearchOpts(new HeaderSearchOptions()),
60     PreprocessorOpts(new PreprocessorOptions()) {}
61 
62 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
63   : RefCountedBase<CompilerInvocation>(),
64     LangOpts(new LangOptions(*X.getLangOpts())),
65     TargetOpts(new TargetOptions(X.getTargetOpts())),
66     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
67     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
68     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
69 
70 CompilerInvocationBase::~CompilerInvocationBase() {}
71 
72 //===----------------------------------------------------------------------===//
73 // Deserialization (from args)
74 //===----------------------------------------------------------------------===//
75 
76 using namespace clang::driver;
77 using namespace clang::driver::options;
78 using namespace llvm::opt;
79 
80 //
81 
82 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
83                                      DiagnosticsEngine &Diags) {
84   unsigned DefaultOpt = 0;
85   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
86     DefaultOpt = 2;
87 
88   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
89     if (A->getOption().matches(options::OPT_O0))
90       return 0;
91 
92     if (A->getOption().matches(options::OPT_Ofast))
93       return 3;
94 
95     assert (A->getOption().matches(options::OPT_O));
96 
97     StringRef S(A->getValue());
98     if (S == "s" || S == "z" || S.empty())
99       return 2;
100 
101     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
102   }
103 
104   return DefaultOpt;
105 }
106 
107 static unsigned getOptimizationLevelSize(ArgList &Args) {
108   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
109     if (A->getOption().matches(options::OPT_O)) {
110       switch (A->getValue()[0]) {
111       default:
112         return 0;
113       case 's':
114         return 1;
115       case 'z':
116         return 2;
117       }
118     }
119   }
120   return 0;
121 }
122 
123 static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
124                               OptSpecifier GroupWithValue,
125                               std::vector<std::string> &Diagnostics) {
126   for (Arg *A : Args.filtered(Group)) {
127     if (A->getOption().getKind() == Option::FlagClass) {
128       // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
129       // its name (minus the "W" or "R" at the beginning) to the warning list.
130       Diagnostics.push_back(A->getOption().getName().drop_front(1));
131     } else if (A->getOption().matches(GroupWithValue)) {
132       // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
133       Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
134     } else {
135       // Otherwise, add its value (for OPT_W_Joined and similar).
136       for (const char *Arg : A->getValues())
137         Diagnostics.emplace_back(Arg);
138     }
139   }
140 }
141 
142 static void getAllNoBuiltinFuncValues(ArgList &Args,
143                                       std::vector<std::string> &Funcs) {
144   SmallVector<const char *, 8> Values;
145   for (const auto &Arg : Args) {
146     const Option &O = Arg->getOption();
147     if (O.matches(options::OPT_fno_builtin_)) {
148       const char *FuncName = Arg->getValue();
149       if (Builtin::Context::isBuiltinFunc(FuncName))
150         Values.push_back(FuncName);
151     }
152   }
153   Funcs.insert(Funcs.end(), Values.begin(), Values.end());
154 }
155 
156 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
157                               DiagnosticsEngine &Diags) {
158   using namespace options;
159   bool Success = true;
160   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
161     StringRef Name = A->getValue();
162     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
163 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
164       .Case(CMDFLAG, NAME##Model)
165 #include "clang/StaticAnalyzer/Core/Analyses.def"
166       .Default(NumStores);
167     if (Value == NumStores) {
168       Diags.Report(diag::err_drv_invalid_value)
169         << A->getAsString(Args) << Name;
170       Success = false;
171     } else {
172       Opts.AnalysisStoreOpt = Value;
173     }
174   }
175 
176   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
177     StringRef Name = A->getValue();
178     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
179 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
180       .Case(CMDFLAG, NAME##Model)
181 #include "clang/StaticAnalyzer/Core/Analyses.def"
182       .Default(NumConstraints);
183     if (Value == NumConstraints) {
184       Diags.Report(diag::err_drv_invalid_value)
185         << A->getAsString(Args) << Name;
186       Success = false;
187     } else {
188       Opts.AnalysisConstraintsOpt = Value;
189     }
190   }
191 
192   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
193     StringRef Name = A->getValue();
194     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
195 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
196       .Case(CMDFLAG, PD_##NAME)
197 #include "clang/StaticAnalyzer/Core/Analyses.def"
198       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
199     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
200       Diags.Report(diag::err_drv_invalid_value)
201         << A->getAsString(Args) << Name;
202       Success = false;
203     } else {
204       Opts.AnalysisDiagOpt = Value;
205     }
206   }
207 
208   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
209     StringRef Name = A->getValue();
210     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
211 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
212       .Case(CMDFLAG, NAME)
213 #include "clang/StaticAnalyzer/Core/Analyses.def"
214       .Default(NumPurgeModes);
215     if (Value == NumPurgeModes) {
216       Diags.Report(diag::err_drv_invalid_value)
217         << A->getAsString(Args) << Name;
218       Success = false;
219     } else {
220       Opts.AnalysisPurgeOpt = Value;
221     }
222   }
223 
224   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
225     StringRef Name = A->getValue();
226     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
227 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
228       .Case(CMDFLAG, NAME)
229 #include "clang/StaticAnalyzer/Core/Analyses.def"
230       .Default(NumInliningModes);
231     if (Value == NumInliningModes) {
232       Diags.Report(diag::err_drv_invalid_value)
233         << A->getAsString(Args) << Name;
234       Success = false;
235     } else {
236       Opts.InliningMode = Value;
237     }
238   }
239 
240   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
241   Opts.ShowEnabledCheckerList = Args.hasArg(OPT_analyzer_list_enabled_checkers);
242   Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
243 
244   Opts.visualizeExplodedGraphWithGraphViz =
245     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
246   Opts.visualizeExplodedGraphWithUbiGraph =
247     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
248   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
249   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
250   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
251   Opts.AnalyzeNestedBlocks =
252     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
253   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
254   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
255   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
256   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
257   Opts.maxBlockVisitOnPath =
258       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
259   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
260   Opts.InlineMaxStackDepth =
261       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
262                          Opts.InlineMaxStackDepth, Diags);
263 
264   Opts.CheckersControlList.clear();
265   for (const Arg *A :
266        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
267     A->claim();
268     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
269     // We can have a list of comma separated checker names, e.g:
270     // '-analyzer-checker=cocoa,unix'
271     StringRef checkerList = A->getValue();
272     SmallVector<StringRef, 4> checkers;
273     checkerList.split(checkers, ",");
274     for (StringRef checker : checkers)
275       Opts.CheckersControlList.emplace_back(checker, enable);
276   }
277 
278   // Go through the analyzer configuration options.
279   for (const Arg *A : Args.filtered(OPT_analyzer_config)) {
280     A->claim();
281     // We can have a list of comma separated config names, e.g:
282     // '-analyzer-config key1=val1,key2=val2'
283     StringRef configList = A->getValue();
284     SmallVector<StringRef, 4> configVals;
285     configList.split(configVals, ",");
286     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
287       StringRef key, val;
288       std::tie(key, val) = configVals[i].split("=");
289       if (val.empty()) {
290         Diags.Report(SourceLocation(),
291                      diag::err_analyzer_config_no_value) << configVals[i];
292         Success = false;
293         break;
294       }
295       if (val.find('=') != StringRef::npos) {
296         Diags.Report(SourceLocation(),
297                      diag::err_analyzer_config_multiple_values)
298           << configVals[i];
299         Success = false;
300         break;
301       }
302       Opts.Config[key] = val;
303     }
304   }
305 
306   return Success;
307 }
308 
309 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
310   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
311   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
312   return true;
313 }
314 
315 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
316   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
317   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
318 }
319 
320 static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
321   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
322     StringRef Value = A->getValue();
323     if (Value == "small" || Value == "kernel" || Value == "medium" ||
324         Value == "large")
325       return Value;
326     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
327   }
328   return "default";
329 }
330 
331 /// \brief Create a new Regex instance out of the string value in \p RpassArg.
332 /// It returns a pointer to the newly generated Regex instance.
333 static std::shared_ptr<llvm::Regex>
334 GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
335                                 Arg *RpassArg) {
336   StringRef Val = RpassArg->getValue();
337   std::string RegexError;
338   std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
339   if (!Pattern->isValid(RegexError)) {
340     Diags.Report(diag::err_drv_optimization_remark_pattern)
341         << RegexError << RpassArg->getAsString(Args);
342     Pattern.reset();
343   }
344   return Pattern;
345 }
346 
347 static bool parseDiagnosticLevelMask(StringRef FlagName,
348                                      const std::vector<std::string> &Levels,
349                                      DiagnosticsEngine *Diags,
350                                      DiagnosticLevelMask &M) {
351   bool Success = true;
352   for (const auto &Level : Levels) {
353     DiagnosticLevelMask const PM =
354       llvm::StringSwitch<DiagnosticLevelMask>(Level)
355         .Case("note",    DiagnosticLevelMask::Note)
356         .Case("remark",  DiagnosticLevelMask::Remark)
357         .Case("warning", DiagnosticLevelMask::Warning)
358         .Case("error",   DiagnosticLevelMask::Error)
359         .Default(DiagnosticLevelMask::None);
360     if (PM == DiagnosticLevelMask::None) {
361       Success = false;
362       if (Diags)
363         Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
364     }
365     M = M | PM;
366   }
367   return Success;
368 }
369 
370 static void parseSanitizerKinds(StringRef FlagName,
371                                 const std::vector<std::string> &Sanitizers,
372                                 DiagnosticsEngine &Diags, SanitizerSet &S) {
373   for (const auto &Sanitizer : Sanitizers) {
374     SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
375     if (K == 0)
376       Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
377     else
378       S.set(K, true);
379   }
380 }
381 
382 // Set the profile kind for fprofile-instrument.
383 static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
384                                DiagnosticsEngine &Diags) {
385   Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
386   if (A == nullptr)
387     return;
388   StringRef S = A->getValue();
389   unsigned I = llvm::StringSwitch<unsigned>(S)
390                    .Case("none", CodeGenOptions::ProfileNone)
391                    .Case("clang", CodeGenOptions::ProfileClangInstr)
392                    .Case("llvm", CodeGenOptions::ProfileIRInstr)
393                    .Default(~0U);
394   if (I == ~0U) {
395     Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
396                                                          << S;
397     return;
398   }
399   CodeGenOptions::ProfileInstrKind Instrumentor =
400       static_cast<CodeGenOptions::ProfileInstrKind>(I);
401   Opts.setProfileInstr(Instrumentor);
402 }
403 
404 // Set the profile kind using fprofile-instrument-use-path.
405 static void setPGOUseInstrumentor(CodeGenOptions &Opts,
406                                   const Twine &ProfileName) {
407   auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
408   // In error, return silently and let Clang PGOUse report the error message.
409   if (auto E = ReaderOrErr.takeError()) {
410     llvm::consumeError(std::move(E));
411     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
412     return;
413   }
414   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
415     std::move(ReaderOrErr.get());
416   if (PGOReader->isIRLevelProfile())
417     Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
418   else
419     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
420 }
421 
422 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
423                              DiagnosticsEngine &Diags,
424                              const TargetOptions &TargetOpts) {
425   using namespace options;
426   bool Success = true;
427   llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
428 
429   unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
430   // TODO: This could be done in Driver
431   unsigned MaxOptLevel = 3;
432   if (OptimizationLevel > MaxOptLevel) {
433     // If the optimization level is not supported, fall back on the default
434     // optimization
435     Diags.Report(diag::warn_drv_optimization_value)
436         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
437     OptimizationLevel = MaxOptLevel;
438   }
439   Opts.OptimizationLevel = OptimizationLevel;
440 
441   // We must always run at least the always inlining pass.
442   Opts.setInlining(
443     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
444                                  : CodeGenOptions::OnlyAlwaysInlining);
445   // -fno-inline-functions overrides OptimizationLevel > 1.
446   Opts.NoInline = Args.hasArg(OPT_fno_inline);
447   if (Arg* InlineArg = Args.getLastArg(options::OPT_finline_functions,
448                                        options::OPT_finline_hint_functions,
449                                        options::OPT_fno_inline_functions)) {
450     const Option& InlineOpt = InlineArg->getOption();
451     if (InlineOpt.matches(options::OPT_finline_functions))
452       Opts.setInlining(CodeGenOptions::NormalInlining);
453     else if (InlineOpt.matches(options::OPT_finline_hint_functions))
454       Opts.setInlining(CodeGenOptions::OnlyHintInlining);
455     else
456       Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
457   }
458 
459   if (Arg *A = Args.getLastArg(OPT_fveclib)) {
460     StringRef Name = A->getValue();
461     if (Name == "Accelerate")
462       Opts.setVecLib(CodeGenOptions::Accelerate);
463     else if (Name == "SVML")
464       Opts.setVecLib(CodeGenOptions::SVML);
465     else if (Name == "none")
466       Opts.setVecLib(CodeGenOptions::NoLibrary);
467     else
468       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
469   }
470 
471   if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
472     unsigned Val =
473         llvm::StringSwitch<unsigned>(A->getValue())
474             .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
475             .Case("limited", codegenoptions::LimitedDebugInfo)
476             .Case("standalone", codegenoptions::FullDebugInfo)
477             .Default(~0U);
478     if (Val == ~0U)
479       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
480                                                 << A->getValue();
481     else
482       Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
483   }
484   if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
485     unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
486                        .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
487                        .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
488                        .Case("sce", unsigned(llvm::DebuggerKind::SCE))
489                        .Default(~0U);
490     if (Val == ~0U)
491       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
492                                                 << A->getValue();
493     else
494       Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
495   }
496   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
497   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
498   Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
499   Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
500   Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
501   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
502   Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
503   Opts.DebugExplicitImport = Triple.isPS4CPU();
504 
505   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
506     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
507 
508   if (const Arg *A =
509           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
510     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
511 
512   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
513   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
514   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
515   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
516   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
517     OPT_fuse_register_sized_bitfield_access);
518   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
519   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
520   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
521   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
522   Opts.NoCommon = Args.hasArg(OPT_fno_common);
523   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
524   Opts.OptimizeSize = getOptimizationLevelSize(Args);
525   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
526                             Args.hasArg(OPT_ffreestanding));
527   if (Opts.SimplifyLibCalls)
528     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
529   Opts.UnrollLoops =
530       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
531                    (Opts.OptimizationLevel > 1));
532   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
533 
534   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
535   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
536   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
537 
538   setPGOInstrumentor(Opts, Args, Diags);
539   Opts.InstrProfileOutput =
540       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
541   Opts.ProfileInstrumentUsePath =
542       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
543   if (!Opts.ProfileInstrumentUsePath.empty())
544     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
545 
546   Opts.CoverageMapping =
547       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
548   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
549   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
550   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
551   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
552   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
553   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
554   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
555   Opts.CodeModel = getCodeModel(Args, Diags);
556   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
557   Opts.DisableFPElim =
558       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
559   Opts.DisableFree = Args.hasArg(OPT_disable_free);
560   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
561   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
562   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
563   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
564   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
565   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
566                        Args.hasArg(OPT_cl_finite_math_only) ||
567                        Args.hasArg(OPT_cl_fast_relaxed_math));
568   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
569                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
570                        Args.hasArg(OPT_cl_finite_math_only) ||
571                        Args.hasArg(OPT_cl_fast_relaxed_math));
572   Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
573                         Args.hasArg(OPT_cl_no_signed_zeros));
574   Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero);
575   Opts.CorrectlyRoundedDivSqrt =
576       Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
577   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
578   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
579   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
580   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
581   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
582   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
583   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
584   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
585   Opts.IncrementalLinkerCompatible =
586       Args.hasArg(OPT_mincremental_linker_compatible);
587   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
588   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
589   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
590   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
591   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
592   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
593   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
594                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
595                       Args.hasArg(OPT_cl_fast_relaxed_math);
596   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
597   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
598   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
599   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
600     Diags.Report(diag::err_drv_invalid_value)
601         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
602         << Opts.ThreadModel;
603   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
604   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
605 
606   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
607                                        OPT_fno_function_sections, false);
608   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
609                                    OPT_fno_data_sections, false);
610   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
611                                          OPT_fno_unique_section_names, true);
612 
613   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
614 
615   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
616 
617   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
618   const Arg *A = Args.getLastArg(OPT_flto, OPT_flto_EQ);
619   Opts.EmitSummaryIndex = A && A->containsValue("thin");
620   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
621     if (IK != IK_LLVM_IR)
622       Diags.Report(diag::err_drv_argument_only_allowed_with)
623           << A->getAsString(Args) << "-x ir";
624     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
625   }
626 
627   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
628 
629   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
630   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
631   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
632 
633   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
634   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
635 
636   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
637   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
638   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
639   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
640     Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
641     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
642     Opts.CoverageNoFunctionNamesInData =
643         Args.hasArg(OPT_coverage_no_function_names_in_data);
644     Opts.CoverageExitBlockBeforeBody =
645         Args.hasArg(OPT_coverage_exit_block_before_body);
646     if (Args.hasArg(OPT_coverage_version_EQ)) {
647       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
648       if (CoverageVersion.size() != 4) {
649         Diags.Report(diag::err_drv_invalid_value)
650             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
651             << CoverageVersion;
652       } else {
653         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
654       }
655     }
656   }
657 	// Handle -fembed-bitcode option.
658   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
659     StringRef Name = A->getValue();
660     unsigned Model = llvm::StringSwitch<unsigned>(Name)
661         .Case("off", CodeGenOptions::Embed_Off)
662         .Case("all", CodeGenOptions::Embed_All)
663         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
664         .Case("marker", CodeGenOptions::Embed_Marker)
665         .Default(~0U);
666     if (Model == ~0U) {
667       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
668       Success = false;
669     } else
670       Opts.setEmbedBitcode(
671           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
672   }
673   // FIXME: For backend options that are not yet recorded as function
674   // attributes in the IR, keep track of them so we can embed them in a
675   // separate data section and use them when building the bitcode.
676   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
677     for (const auto &A : Args) {
678       // Do not encode output and input.
679       if (A->getOption().getID() == options::OPT_o ||
680           A->getOption().getID() == options::OPT_INPUT ||
681           A->getOption().getID() == options::OPT_x ||
682           A->getOption().getID() == options::OPT_fembed_bitcode ||
683           (A->getOption().getGroup().isValid() &&
684            A->getOption().getGroup().getID() == options::OPT_W_Group))
685         continue;
686       ArgStringList ASL;
687       A->render(Args, ASL);
688       for (const auto &arg : ASL) {
689         StringRef ArgStr(arg);
690         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
691         // using \00 to seperate each commandline options.
692         Opts.CmdArgs.push_back('\0');
693       }
694     }
695   }
696 
697   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
698   Opts.XRayInstrumentFunctions = Args.hasArg(OPT_fxray_instrument);
699   Opts.XRayInstructionThreshold =
700       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_, 200, Diags);
701   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
702   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
703   Opts.CompressDebugSections = Args.hasArg(OPT_compress_debug_sections);
704   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
705   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
706   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
707     unsigned LinkFlags = llvm::Linker::Flags::None;
708     if (A->getOption().matches(OPT_mlink_cuda_bitcode))
709       LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded |
710                   llvm::Linker::Flags::InternalizeLinkedSymbols;
711     Opts.LinkBitcodeFiles.push_back(std::make_pair(LinkFlags, A->getValue()));
712   }
713   Opts.SanitizeCoverageType =
714       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
715   Opts.SanitizeCoverageIndirectCalls =
716       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
717   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
718   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
719   Opts.SanitizeCoverage8bitCounters =
720       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
721   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
722   Opts.SanitizeMemoryTrackOrigins =
723       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
724   Opts.SanitizeMemoryUseAfterDtor =
725       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
726   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
727   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
728   Opts.SanitizeAddressUseAfterScope =
729       Args.hasArg(OPT_fsanitize_address_use_after_scope);
730   Opts.SSPBufferSize =
731       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
732   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
733   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
734     StringRef Val = A->getValue();
735     unsigned StackAlignment = Opts.StackAlignment;
736     Val.getAsInteger(10, StackAlignment);
737     Opts.StackAlignment = StackAlignment;
738   }
739 
740   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
741     StringRef Val = A->getValue();
742     unsigned StackProbeSize = Opts.StackProbeSize;
743     Val.getAsInteger(0, StackProbeSize);
744     Opts.StackProbeSize = StackProbeSize;
745   }
746 
747   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
748     StringRef Name = A->getValue();
749     unsigned Method = llvm::StringSwitch<unsigned>(Name)
750       .Case("legacy", CodeGenOptions::Legacy)
751       .Case("non-legacy", CodeGenOptions::NonLegacy)
752       .Case("mixed", CodeGenOptions::Mixed)
753       .Default(~0U);
754     if (Method == ~0U) {
755       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
756       Success = false;
757     } else {
758       Opts.setObjCDispatchMethod(
759         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
760     }
761   }
762 
763   Opts.EmulatedTLS =
764       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
765 
766   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
767     StringRef Name = A->getValue();
768     unsigned Model = llvm::StringSwitch<unsigned>(Name)
769         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
770         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
771         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
772         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
773         .Default(~0U);
774     if (Model == ~0U) {
775       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
776       Success = false;
777     } else {
778       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
779     }
780   }
781 
782   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
783     StringRef Val = A->getValue();
784     if (Val == "fast")
785       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
786     else if (Val == "on")
787       Opts.setFPContractMode(CodeGenOptions::FPC_On);
788     else if (Val == "off")
789       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
790     else
791       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
792   }
793 
794   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
795     if (A->getOption().matches(OPT_fpcc_struct_return)) {
796       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
797     } else {
798       assert(A->getOption().matches(OPT_freg_struct_return));
799       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
800     }
801   }
802 
803   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
804   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
805   bool NeedLocTracking = false;
806 
807   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
808     Opts.OptimizationRemarkPattern =
809         GenerateOptimizationRemarkRegex(Diags, Args, A);
810     NeedLocTracking = true;
811   }
812 
813   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
814     Opts.OptimizationRemarkMissedPattern =
815         GenerateOptimizationRemarkRegex(Diags, Args, A);
816     NeedLocTracking = true;
817   }
818 
819   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
820     Opts.OptimizationRemarkAnalysisPattern =
821         GenerateOptimizationRemarkRegex(Diags, Args, A);
822     NeedLocTracking = true;
823   }
824 
825   // If the user requested to use a sample profile for PGO, then the
826   // backend will need to track source location information so the profile
827   // can be incorporated into the IR.
828   if (!Opts.SampleProfileFile.empty())
829     NeedLocTracking = true;
830 
831   // If the user requested a flag that requires source locations available in
832   // the backend, make sure that the backend tracks source location information.
833   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
834     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
835 
836   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
837 
838   // Parse -fsanitize-recover= arguments.
839   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
840   parseSanitizerKinds("-fsanitize-recover=",
841                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
842                       Opts.SanitizeRecover);
843   parseSanitizerKinds("-fsanitize-trap=",
844                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
845                       Opts.SanitizeTrap);
846 
847   Opts.CudaGpuBinaryFileNames =
848       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
849 
850   Opts.Backchain = Args.hasArg(OPT_mbackchain);
851 
852   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
853       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
854 
855   return Success;
856 }
857 
858 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
859                                       ArgList &Args) {
860   using namespace options;
861   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
862   Opts.Targets = Args.getAllArgValues(OPT_MT);
863   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
864   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
865   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
866   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
867   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
868   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
869   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
870   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
871   Opts.ModuleDependencyOutputDir =
872       Args.getLastArgValue(OPT_module_dependency_dir);
873   if (Args.hasArg(OPT_MV))
874     Opts.OutputFormat = DependencyOutputFormat::NMake;
875   // Add sanitizer blacklists as extra dependencies.
876   // They won't be discovered by the regular preprocessor, so
877   // we let make / ninja to know about this implicit dependency.
878   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
879   auto ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
880   Opts.ExtraDeps.insert(Opts.ExtraDeps.end(), ModuleFiles.begin(),
881                         ModuleFiles.end());
882 }
883 
884 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
885   // Color diagnostics default to auto ("on" if terminal supports) in the driver
886   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
887   // Support both clang's -f[no-]color-diagnostics and gcc's
888   // -f[no-]diagnostics-colors[=never|always|auto].
889   enum {
890     Colors_On,
891     Colors_Off,
892     Colors_Auto
893   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
894   for (Arg *A : Args) {
895     const Option &O = A->getOption();
896     if (!O.matches(options::OPT_fcolor_diagnostics) &&
897         !O.matches(options::OPT_fdiagnostics_color) &&
898         !O.matches(options::OPT_fno_color_diagnostics) &&
899         !O.matches(options::OPT_fno_diagnostics_color) &&
900         !O.matches(options::OPT_fdiagnostics_color_EQ))
901       continue;
902 
903     if (O.matches(options::OPT_fcolor_diagnostics) ||
904         O.matches(options::OPT_fdiagnostics_color)) {
905       ShowColors = Colors_On;
906     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
907                O.matches(options::OPT_fno_diagnostics_color)) {
908       ShowColors = Colors_Off;
909     } else {
910       assert(O.matches(options::OPT_fdiagnostics_color_EQ));
911       StringRef Value(A->getValue());
912       if (Value == "always")
913         ShowColors = Colors_On;
914       else if (Value == "never")
915         ShowColors = Colors_Off;
916       else if (Value == "auto")
917         ShowColors = Colors_Auto;
918     }
919   }
920   if (ShowColors == Colors_On ||
921       (ShowColors == Colors_Auto && llvm::sys::Process::StandardErrHasColors()))
922     return true;
923   return false;
924 }
925 
926 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
927                                 DiagnosticsEngine *Diags,
928                                 bool DefaultDiagColor) {
929   using namespace options;
930   bool Success = true;
931 
932   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
933   if (Arg *A =
934           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
935     Opts.DiagnosticSerializationFile = A->getValue();
936   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
937   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
938   Opts.Pedantic = Args.hasArg(OPT_pedantic);
939   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
940   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
941   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
942   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
943                                  OPT_fno_show_column,
944                                  /*Default=*/true);
945   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
946   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
947   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
948 
949   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
950 
951   // Default behavior is to not to show note include stacks.
952   Opts.ShowNoteIncludeStack = false;
953   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
954                                OPT_fno_diagnostics_show_note_include_stack))
955     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
956       Opts.ShowNoteIncludeStack = true;
957 
958   StringRef ShowOverloads =
959     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
960   if (ShowOverloads == "best")
961     Opts.setShowOverloads(Ovl_Best);
962   else if (ShowOverloads == "all")
963     Opts.setShowOverloads(Ovl_All);
964   else {
965     Success = false;
966     if (Diags)
967       Diags->Report(diag::err_drv_invalid_value)
968       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
969       << ShowOverloads;
970   }
971 
972   StringRef ShowCategory =
973     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
974   if (ShowCategory == "none")
975     Opts.ShowCategories = 0;
976   else if (ShowCategory == "id")
977     Opts.ShowCategories = 1;
978   else if (ShowCategory == "name")
979     Opts.ShowCategories = 2;
980   else {
981     Success = false;
982     if (Diags)
983       Diags->Report(diag::err_drv_invalid_value)
984       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
985       << ShowCategory;
986   }
987 
988   StringRef Format =
989     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
990   if (Format == "clang")
991     Opts.setFormat(DiagnosticOptions::Clang);
992   else if (Format == "msvc")
993     Opts.setFormat(DiagnosticOptions::MSVC);
994   else if (Format == "msvc-fallback") {
995     Opts.setFormat(DiagnosticOptions::MSVC);
996     Opts.CLFallbackMode = true;
997   } else if (Format == "vi")
998     Opts.setFormat(DiagnosticOptions::Vi);
999   else {
1000     Success = false;
1001     if (Diags)
1002       Diags->Report(diag::err_drv_invalid_value)
1003       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
1004       << Format;
1005   }
1006 
1007   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
1008   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
1009   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
1010   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
1011   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
1012   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
1013     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
1014     Diags, DiagMask);
1015   if (Args.hasArg(OPT_verify_ignore_unexpected))
1016     DiagMask = DiagnosticLevelMask::All;
1017   Opts.setVerifyIgnoreUnexpected(DiagMask);
1018   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1019   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1020   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1021   Opts.MacroBacktraceLimit =
1022       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1023                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1024   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1025       Args, OPT_ftemplate_backtrace_limit,
1026       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1027   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1028       Args, OPT_fconstexpr_backtrace_limit,
1029       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1030   Opts.SpellCheckingLimit = getLastArgIntValue(
1031       Args, OPT_fspell_checking_limit,
1032       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1033   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1034                                     DiagnosticOptions::DefaultTabStop, Diags);
1035   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1036     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1037     if (Diags)
1038       Diags->Report(diag::warn_ignoring_ftabstop_value)
1039       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1040   }
1041   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1042   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1043   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1044 
1045   return Success;
1046 }
1047 
1048 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1049   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1050 }
1051 
1052 /// Parse the argument to the -ftest-module-file-extension
1053 /// command-line argument.
1054 ///
1055 /// \returns true on error, false on success.
1056 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1057                                             std::string &BlockName,
1058                                             unsigned &MajorVersion,
1059                                             unsigned &MinorVersion,
1060                                             bool &Hashed,
1061                                             std::string &UserInfo) {
1062   SmallVector<StringRef, 5> Args;
1063   Arg.split(Args, ':', 5);
1064   if (Args.size() < 5)
1065     return true;
1066 
1067   BlockName = Args[0];
1068   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1069   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1070   if (Args[3].getAsInteger(2, Hashed)) return true;
1071   if (Args.size() > 4)
1072     UserInfo = Args[4];
1073   return false;
1074 }
1075 
1076 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1077                                    DiagnosticsEngine &Diags) {
1078   using namespace options;
1079   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1080   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1081     switch (A->getOption().getID()) {
1082     default:
1083       llvm_unreachable("Invalid option in group!");
1084     case OPT_ast_list:
1085       Opts.ProgramAction = frontend::ASTDeclList; break;
1086     case OPT_ast_dump:
1087     case OPT_ast_dump_lookups:
1088       Opts.ProgramAction = frontend::ASTDump; break;
1089     case OPT_ast_print:
1090       Opts.ProgramAction = frontend::ASTPrint; break;
1091     case OPT_ast_view:
1092       Opts.ProgramAction = frontend::ASTView; break;
1093     case OPT_dump_raw_tokens:
1094       Opts.ProgramAction = frontend::DumpRawTokens; break;
1095     case OPT_dump_tokens:
1096       Opts.ProgramAction = frontend::DumpTokens; break;
1097     case OPT_S:
1098       Opts.ProgramAction = frontend::EmitAssembly; break;
1099     case OPT_emit_llvm_bc:
1100       Opts.ProgramAction = frontend::EmitBC; break;
1101     case OPT_emit_html:
1102       Opts.ProgramAction = frontend::EmitHTML; break;
1103     case OPT_emit_llvm:
1104       Opts.ProgramAction = frontend::EmitLLVM; break;
1105     case OPT_emit_llvm_only:
1106       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1107     case OPT_emit_codegen_only:
1108       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1109     case OPT_emit_obj:
1110       Opts.ProgramAction = frontend::EmitObj; break;
1111     case OPT_fixit_EQ:
1112       Opts.FixItSuffix = A->getValue();
1113       // fall-through!
1114     case OPT_fixit:
1115       Opts.ProgramAction = frontend::FixIt; break;
1116     case OPT_emit_module:
1117       Opts.ProgramAction = frontend::GenerateModule; break;
1118     case OPT_emit_pch:
1119       Opts.ProgramAction = frontend::GeneratePCH; break;
1120     case OPT_emit_pth:
1121       Opts.ProgramAction = frontend::GeneratePTH; break;
1122     case OPT_init_only:
1123       Opts.ProgramAction = frontend::InitOnly; break;
1124     case OPT_fsyntax_only:
1125       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1126     case OPT_module_file_info:
1127       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1128     case OPT_verify_pch:
1129       Opts.ProgramAction = frontend::VerifyPCH; break;
1130     case OPT_print_decl_contexts:
1131       Opts.ProgramAction = frontend::PrintDeclContext; break;
1132     case OPT_print_preamble:
1133       Opts.ProgramAction = frontend::PrintPreamble; break;
1134     case OPT_E:
1135       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1136     case OPT_rewrite_macros:
1137       Opts.ProgramAction = frontend::RewriteMacros; break;
1138     case OPT_rewrite_objc:
1139       Opts.ProgramAction = frontend::RewriteObjC; break;
1140     case OPT_rewrite_test:
1141       Opts.ProgramAction = frontend::RewriteTest; break;
1142     case OPT_analyze:
1143       Opts.ProgramAction = frontend::RunAnalysis; break;
1144     case OPT_migrate:
1145       Opts.ProgramAction = frontend::MigrateSource; break;
1146     case OPT_Eonly:
1147       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1148     }
1149   }
1150 
1151   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1152     Opts.Plugins.emplace_back(A->getValue(0));
1153     Opts.ProgramAction = frontend::PluginAction;
1154     Opts.ActionName = A->getValue();
1155   }
1156   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1157   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1158     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1159 
1160   for (const std::string &Arg :
1161          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1162     std::string BlockName;
1163     unsigned MajorVersion;
1164     unsigned MinorVersion;
1165     bool Hashed;
1166     std::string UserInfo;
1167     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1168                                         MinorVersion, Hashed, UserInfo)) {
1169       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1170 
1171       continue;
1172     }
1173 
1174     // Add the testing module file extension.
1175     Opts.ModuleFileExtensions.push_back(
1176       new TestModuleFileExtension(BlockName, MajorVersion, MinorVersion,
1177                                   Hashed, UserInfo));
1178   }
1179 
1180   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1181     Opts.CodeCompletionAt =
1182       ParsedSourceLocation::FromString(A->getValue());
1183     if (Opts.CodeCompletionAt.FileName.empty())
1184       Diags.Report(diag::err_drv_invalid_value)
1185         << A->getAsString(Args) << A->getValue();
1186   }
1187   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1188 
1189   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1190   Opts.Plugins = Args.getAllArgValues(OPT_load);
1191   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1192   Opts.ShowHelp = Args.hasArg(OPT_help);
1193   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1194   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1195   Opts.ShowVersion = Args.hasArg(OPT_version);
1196   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1197   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1198   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1199   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1200   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1201   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1202   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1203   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1204   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1205   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1206   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1207   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1208   Opts.ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
1209   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1210   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1211   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
1212 
1213   Opts.CodeCompleteOpts.IncludeMacros
1214     = Args.hasArg(OPT_code_completion_macros);
1215   Opts.CodeCompleteOpts.IncludeCodePatterns
1216     = Args.hasArg(OPT_code_completion_patterns);
1217   Opts.CodeCompleteOpts.IncludeGlobals
1218     = !Args.hasArg(OPT_no_code_completion_globals);
1219   Opts.CodeCompleteOpts.IncludeBriefComments
1220     = Args.hasArg(OPT_code_completion_brief_comments);
1221 
1222   Opts.OverrideRecordLayoutsFile
1223     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1224   Opts.AuxTriple =
1225       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1226   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1227 
1228   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1229                                      OPT_arcmt_modify,
1230                                      OPT_arcmt_migrate)) {
1231     switch (A->getOption().getID()) {
1232     default:
1233       llvm_unreachable("missed a case");
1234     case OPT_arcmt_check:
1235       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1236       break;
1237     case OPT_arcmt_modify:
1238       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1239       break;
1240     case OPT_arcmt_migrate:
1241       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1242       break;
1243     }
1244   }
1245   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1246   Opts.ARCMTMigrateReportOut
1247     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1248   Opts.ARCMTMigrateEmitARCErrors
1249     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1250 
1251   if (Args.hasArg(OPT_objcmt_migrate_literals))
1252     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1253   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1254     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1255   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1256     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1257   if (Args.hasArg(OPT_objcmt_migrate_property))
1258     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1259   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1260     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1261   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1262     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1263   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1264     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1265   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1266     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1267   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1268     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1269   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1270     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1271   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1272     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1273   if (Args.hasArg(OPT_objcmt_atomic_property))
1274     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1275   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1276     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1277   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1278     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1279   if (Args.hasArg(OPT_objcmt_migrate_all))
1280     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1281 
1282   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1283 
1284   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1285       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1286     Diags.Report(diag::err_drv_argument_not_allowed_with)
1287       << "ARC migration" << "ObjC migration";
1288   }
1289 
1290   InputKind DashX = IK_None;
1291   if (const Arg *A = Args.getLastArg(OPT_x)) {
1292     DashX = llvm::StringSwitch<InputKind>(A->getValue())
1293       .Case("c", IK_C)
1294       .Case("cl", IK_OpenCL)
1295       .Case("cuda", IK_CUDA)
1296       .Case("c++", IK_CXX)
1297       .Case("objective-c", IK_ObjC)
1298       .Case("objective-c++", IK_ObjCXX)
1299       .Case("cpp-output", IK_PreprocessedC)
1300       .Case("assembler-with-cpp", IK_Asm)
1301       .Case("c++-cpp-output", IK_PreprocessedCXX)
1302       .Case("cuda-cpp-output", IK_PreprocessedCuda)
1303       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
1304       .Case("objc-cpp-output", IK_PreprocessedObjC)
1305       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
1306       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
1307       .Case("c-header", IK_C)
1308       .Case("cl-header", IK_OpenCL)
1309       .Case("objective-c-header", IK_ObjC)
1310       .Case("c++-header", IK_CXX)
1311       .Case("objective-c++-header", IK_ObjCXX)
1312       .Cases("ast", "pcm", IK_AST)
1313       .Case("ir", IK_LLVM_IR)
1314       .Case("renderscript", IK_RenderScript)
1315       .Default(IK_None);
1316     if (DashX == IK_None)
1317       Diags.Report(diag::err_drv_invalid_value)
1318         << A->getAsString(Args) << A->getValue();
1319   }
1320 
1321   // '-' is the default input if none is given.
1322   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1323   Opts.Inputs.clear();
1324   if (Inputs.empty())
1325     Inputs.push_back("-");
1326   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1327     InputKind IK = DashX;
1328     if (IK == IK_None) {
1329       IK = FrontendOptions::getInputKindForExtension(
1330         StringRef(Inputs[i]).rsplit('.').second);
1331       // FIXME: Remove this hack.
1332       if (i == 0)
1333         DashX = IK;
1334     }
1335     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1336   }
1337 
1338   return DashX;
1339 }
1340 
1341 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1342                                                  void *MainAddr) {
1343   std::string ClangExecutable =
1344       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1345   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1346 
1347   // Compute the path to the resource directory.
1348   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1349   SmallString<128> P(Dir);
1350   if (ClangResourceDir != "")
1351     llvm::sys::path::append(P, ClangResourceDir);
1352   else
1353     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1354                             "clang", CLANG_VERSION_STRING);
1355 
1356   return P.str();
1357 }
1358 
1359 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
1360   using namespace options;
1361   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1362   Opts.Verbose = Args.hasArg(OPT_v);
1363   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1364   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1365   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1366   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1367     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1368   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1369   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
1370   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1371   for (const Arg *A : Args.filtered(OPT_fprebuilt_module_path))
1372     Opts.AddPrebuiltModulePath(A->getValue());
1373   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1374   Opts.ModulesValidateDiagnosticOptions =
1375       !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
1376   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1377   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1378   Opts.ModuleCachePruneInterval =
1379       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1380   Opts.ModuleCachePruneAfter =
1381       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1382   Opts.ModulesValidateOncePerBuildSession =
1383       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1384   Opts.BuildSessionTimestamp =
1385       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1386   Opts.ModulesValidateSystemHeaders =
1387       Args.hasArg(OPT_fmodules_validate_system_headers);
1388   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1389     Opts.ModuleFormat = A->getValue();
1390 
1391   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1392     StringRef MacroDef = A->getValue();
1393     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
1394   }
1395 
1396   // Add -I..., -F..., and -index-header-map options in order.
1397   bool IsIndexHeaderMap = false;
1398   bool IsSysrootSpecified =
1399       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1400   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1401     if (A->getOption().matches(OPT_index_header_map)) {
1402       // -index-header-map applies to the next -I or -F.
1403       IsIndexHeaderMap = true;
1404       continue;
1405     }
1406 
1407     frontend::IncludeDirGroup Group =
1408         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1409 
1410     bool IsFramework = A->getOption().matches(OPT_F);
1411     std::string Path = A->getValue();
1412 
1413     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1414       SmallString<32> Buffer;
1415       llvm::sys::path::append(Buffer, Opts.Sysroot,
1416                               llvm::StringRef(A->getValue()).substr(1));
1417       Path = Buffer.str();
1418     }
1419 
1420     Opts.AddPath(Path.c_str(), Group, IsFramework,
1421                  /*IgnoreSysroot*/ true);
1422     IsIndexHeaderMap = false;
1423   }
1424 
1425   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1426   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1427   for (const Arg *A :
1428        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1429     if (A->getOption().matches(OPT_iprefix))
1430       Prefix = A->getValue();
1431     else if (A->getOption().matches(OPT_iwithprefix))
1432       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1433     else
1434       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1435   }
1436 
1437   for (const Arg *A : Args.filtered(OPT_idirafter))
1438     Opts.AddPath(A->getValue(), frontend::After, false, true);
1439   for (const Arg *A : Args.filtered(OPT_iquote))
1440     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1441   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1442     Opts.AddPath(A->getValue(), frontend::System, false,
1443                  !A->getOption().matches(OPT_iwithsysroot));
1444   for (const Arg *A : Args.filtered(OPT_iframework))
1445     Opts.AddPath(A->getValue(), frontend::System, true, true);
1446 
1447   // Add the paths for the various language specific isystem flags.
1448   for (const Arg *A : Args.filtered(OPT_c_isystem))
1449     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1450   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1451     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1452   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1453     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1454   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1455     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1456 
1457   // Add the internal paths from a driver that detects standard include paths.
1458   for (const Arg *A :
1459        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1460     frontend::IncludeDirGroup Group = frontend::System;
1461     if (A->getOption().matches(OPT_internal_externc_isystem))
1462       Group = frontend::ExternCSystem;
1463     Opts.AddPath(A->getValue(), Group, false, true);
1464   }
1465 
1466   // Add the path prefixes which are implicitly treated as being system headers.
1467   for (const Arg *A :
1468        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1469     Opts.AddSystemHeaderPrefix(
1470         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1471 
1472   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1473     Opts.AddVFSOverlayFile(A->getValue());
1474 }
1475 
1476 static bool isOpenCL(LangStandard::Kind LangStd) {
1477   return LangStd == LangStandard::lang_opencl ||
1478          LangStd == LangStandard::lang_opencl11 ||
1479          LangStd == LangStandard::lang_opencl12 ||
1480          LangStd == LangStandard::lang_opencl20;
1481 }
1482 
1483 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1484                                          const llvm::Triple &T,
1485                                          PreprocessorOptions &PPOpts,
1486                                          LangStandard::Kind LangStd) {
1487   // Set some properties which depend solely on the input kind; it would be nice
1488   // to move these to the language standard, and have the driver resolve the
1489   // input kind + language standard.
1490   if (IK == IK_Asm) {
1491     Opts.AsmPreprocessor = 1;
1492   } else if (IK == IK_ObjC ||
1493              IK == IK_ObjCXX ||
1494              IK == IK_PreprocessedObjC ||
1495              IK == IK_PreprocessedObjCXX) {
1496     Opts.ObjC1 = Opts.ObjC2 = 1;
1497   }
1498 
1499   if (LangStd == LangStandard::lang_unspecified) {
1500     // Based on the base language, pick one.
1501     switch (IK) {
1502     case IK_None:
1503     case IK_AST:
1504     case IK_LLVM_IR:
1505       llvm_unreachable("Invalid input kind!");
1506     case IK_OpenCL:
1507       LangStd = LangStandard::lang_opencl;
1508       break;
1509     case IK_CUDA:
1510     case IK_PreprocessedCuda:
1511       LangStd = LangStandard::lang_cuda;
1512       break;
1513     case IK_Asm:
1514     case IK_C:
1515     case IK_PreprocessedC:
1516     case IK_ObjC:
1517     case IK_PreprocessedObjC:
1518       // The PS4 uses C99 as the default C standard.
1519       if (T.isPS4())
1520         LangStd = LangStandard::lang_gnu99;
1521       else
1522         LangStd = LangStandard::lang_gnu11;
1523       break;
1524     case IK_CXX:
1525     case IK_PreprocessedCXX:
1526     case IK_ObjCXX:
1527     case IK_PreprocessedObjCXX:
1528       LangStd = LangStandard::lang_gnucxx98;
1529       break;
1530     case IK_RenderScript:
1531       LangStd = LangStandard::lang_c99;
1532       break;
1533     }
1534   }
1535 
1536   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1537   Opts.LineComment = Std.hasLineComments();
1538   Opts.C99 = Std.isC99();
1539   Opts.C11 = Std.isC11();
1540   Opts.CPlusPlus = Std.isCPlusPlus();
1541   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1542   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1543   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1544   Opts.Digraphs = Std.hasDigraphs();
1545   Opts.GNUMode = Std.isGNUMode();
1546   Opts.GNUInline = Std.isC89();
1547   Opts.HexFloats = Std.hasHexFloats();
1548   Opts.ImplicitInt = Std.hasImplicitInt();
1549 
1550   // Set OpenCL Version.
1551   Opts.OpenCL = isOpenCL(LangStd) || IK == IK_OpenCL;
1552   if (LangStd == LangStandard::lang_opencl)
1553     Opts.OpenCLVersion = 100;
1554   else if (LangStd == LangStandard::lang_opencl11)
1555     Opts.OpenCLVersion = 110;
1556   else if (LangStd == LangStandard::lang_opencl12)
1557     Opts.OpenCLVersion = 120;
1558   else if (LangStd == LangStandard::lang_opencl20)
1559     Opts.OpenCLVersion = 200;
1560 
1561   // OpenCL has some additional defaults.
1562   if (Opts.OpenCL) {
1563     Opts.AltiVec = 0;
1564     Opts.ZVector = 0;
1565     Opts.CXXOperatorNames = 1;
1566     Opts.LaxVectorConversions = 0;
1567     Opts.DefaultFPContract = 1;
1568     Opts.NativeHalfType = 1;
1569     Opts.NativeHalfArgsAndReturns = 1;
1570     // Include default header file for OpenCL.
1571     if (Opts.IncludeDefaultHeader) {
1572       PPOpts.Includes.push_back("opencl-c.h");
1573     }
1574   }
1575 
1576   Opts.CUDA = IK == IK_CUDA || IK == IK_PreprocessedCuda ||
1577               LangStd == LangStandard::lang_cuda;
1578 
1579   Opts.RenderScript = IK == IK_RenderScript;
1580   if (Opts.RenderScript) {
1581     Opts.NativeHalfType = 1;
1582     Opts.NativeHalfArgsAndReturns = 1;
1583   }
1584 
1585   // OpenCL and C++ both have bool, true, false keywords.
1586   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1587 
1588   // OpenCL has half keyword
1589   Opts.Half = Opts.OpenCL;
1590 
1591   // C++ has wchar_t keyword.
1592   Opts.WChar = Opts.CPlusPlus;
1593 
1594   Opts.GNUKeywords = Opts.GNUMode;
1595   Opts.CXXOperatorNames = Opts.CPlusPlus;
1596 
1597   Opts.DollarIdents = !Opts.AsmPreprocessor;
1598 }
1599 
1600 /// Attempt to parse a visibility value out of the given argument.
1601 static Visibility parseVisibility(Arg *arg, ArgList &args,
1602                                   DiagnosticsEngine &diags) {
1603   StringRef value = arg->getValue();
1604   if (value == "default") {
1605     return DefaultVisibility;
1606   } else if (value == "hidden" || value == "internal") {
1607     return HiddenVisibility;
1608   } else if (value == "protected") {
1609     // FIXME: diagnose if target does not support protected visibility
1610     return ProtectedVisibility;
1611   }
1612 
1613   diags.Report(diag::err_drv_invalid_value)
1614     << arg->getAsString(args) << value;
1615   return DefaultVisibility;
1616 }
1617 
1618 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1619                           const TargetOptions &TargetOpts,
1620                           PreprocessorOptions &PPOpts,
1621                           DiagnosticsEngine &Diags) {
1622   // FIXME: Cleanup per-file based stuff.
1623   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1624   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1625     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1626 #define LANGSTANDARD(id, name, desc, features) \
1627       .Case(name, LangStandard::lang_##id)
1628 #define LANGSTANDARD_ALIAS(id, alias) \
1629       .Case(alias, LangStandard::lang_##id)
1630 #include "clang/Frontend/LangStandards.def"
1631       .Default(LangStandard::lang_unspecified);
1632     if (LangStd == LangStandard::lang_unspecified)
1633       Diags.Report(diag::err_drv_invalid_value)
1634         << A->getAsString(Args) << A->getValue();
1635     else {
1636       // Valid standard, check to make sure language and standard are
1637       // compatible.
1638       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1639       switch (IK) {
1640       case IK_C:
1641       case IK_ObjC:
1642       case IK_PreprocessedC:
1643       case IK_PreprocessedObjC:
1644         if (!(Std.isC89() || Std.isC99()))
1645           Diags.Report(diag::err_drv_argument_not_allowed_with)
1646             << A->getAsString(Args) << "C/ObjC";
1647         break;
1648       case IK_CXX:
1649       case IK_ObjCXX:
1650       case IK_PreprocessedCXX:
1651       case IK_PreprocessedObjCXX:
1652         if (!Std.isCPlusPlus())
1653           Diags.Report(diag::err_drv_argument_not_allowed_with)
1654             << A->getAsString(Args) << "C++/ObjC++";
1655         break;
1656       case IK_OpenCL:
1657         if (!isOpenCL(LangStd))
1658           Diags.Report(diag::err_drv_argument_not_allowed_with)
1659             << A->getAsString(Args) << "OpenCL";
1660         break;
1661       case IK_CUDA:
1662       case IK_PreprocessedCuda:
1663         if (!Std.isCPlusPlus())
1664           Diags.Report(diag::err_drv_argument_not_allowed_with)
1665             << A->getAsString(Args) << "CUDA";
1666         break;
1667       default:
1668         break;
1669       }
1670     }
1671   }
1672 
1673   // -cl-std only applies for OpenCL language standards.
1674   // Override the -std option in this case.
1675   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1676     LangStandard::Kind OpenCLLangStd
1677     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1678     .Cases("cl", "CL", LangStandard::lang_opencl)
1679     .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
1680     .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
1681     .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
1682     .Default(LangStandard::lang_unspecified);
1683 
1684     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1685       Diags.Report(diag::err_drv_invalid_value)
1686       << A->getAsString(Args) << A->getValue();
1687     }
1688     else
1689       LangStd = OpenCLLangStd;
1690   }
1691 
1692   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
1693 
1694   llvm::Triple T(TargetOpts.Triple);
1695   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
1696 
1697   // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
1698   // This option should be deprecated for CL > 1.0 because
1699   // this option was added for compatibility with OpenCL 1.0.
1700   if (Args.getLastArg(OPT_cl_strict_aliasing)
1701        && Opts.OpenCLVersion > 100) {
1702     std::string VerSpec = llvm::to_string(Opts.OpenCLVersion / 100) +
1703                           std::string(".") +
1704                           llvm::to_string((Opts.OpenCLVersion % 100) / 10);
1705     Diags.Report(diag::warn_option_invalid_ocl_version)
1706       << VerSpec << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
1707   }
1708 
1709   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1710   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1711   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1712   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1713   // name, as it doesn't seem a useful distinction.
1714   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1715                                   Opts.GNUKeywords);
1716 
1717   if (Args.hasArg(OPT_fno_operator_names))
1718     Opts.CXXOperatorNames = 0;
1719 
1720   if (Args.hasArg(OPT_fcuda_is_device))
1721     Opts.CUDAIsDevice = 1;
1722 
1723   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1724     Opts.CUDAAllowVariadicFunctions = 1;
1725 
1726   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1727     Opts.CUDAHostDeviceConstexpr = 0;
1728 
1729   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1730     Opts.CUDADeviceFlushDenormalsToZero = 1;
1731 
1732   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1733     Opts.CUDADeviceApproxTranscendentals = 1;
1734 
1735   if (Opts.ObjC1) {
1736     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1737       StringRef value = arg->getValue();
1738       if (Opts.ObjCRuntime.tryParse(value))
1739         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1740     }
1741 
1742     if (Args.hasArg(OPT_fobjc_gc_only))
1743       Opts.setGC(LangOptions::GCOnly);
1744     else if (Args.hasArg(OPT_fobjc_gc))
1745       Opts.setGC(LangOptions::HybridGC);
1746     else if (Args.hasArg(OPT_fobjc_arc)) {
1747       Opts.ObjCAutoRefCount = 1;
1748       if (!Opts.ObjCRuntime.allowsARC())
1749         Diags.Report(diag::err_arc_unsupported_on_runtime);
1750     }
1751 
1752     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
1753     // whether the feature is actually enabled.  This is predominantly
1754     // determined by -fobjc-runtime, but we allow it to be overridden
1755     // from the command line for testing purposes.
1756     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1757       Opts.ObjCWeakRuntime = 1;
1758     else
1759       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
1760 
1761     // ObjCWeak determines whether __weak is actually enabled.
1762     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
1763     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
1764       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
1765         assert(!Opts.ObjCWeak);
1766       } else if (Opts.getGC() != LangOptions::NonGC) {
1767         Diags.Report(diag::err_objc_weak_with_gc);
1768       } else if (!Opts.ObjCWeakRuntime) {
1769         Diags.Report(diag::err_objc_weak_unsupported);
1770       } else {
1771         Opts.ObjCWeak = 1;
1772       }
1773     } else if (Opts.ObjCAutoRefCount) {
1774       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
1775     }
1776 
1777     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1778       Opts.ObjCInferRelatedResultType = 0;
1779 
1780     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1781       Opts.ObjCSubscriptingLegacyRuntime =
1782         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1783   }
1784 
1785   if (Args.hasArg(OPT_fgnu89_inline)) {
1786     if (Opts.CPlusPlus)
1787       Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fgnu89-inline"
1788                                                             << "C++/ObjC++";
1789     else
1790       Opts.GNUInline = 1;
1791   }
1792 
1793   if (Args.hasArg(OPT_fapple_kext)) {
1794     if (!Opts.CPlusPlus)
1795       Diags.Report(diag::warn_c_kext);
1796     else
1797       Opts.AppleKext = 1;
1798   }
1799 
1800   if (Args.hasArg(OPT_print_ivar_layout))
1801     Opts.ObjCGCBitmapPrint = 1;
1802   if (Args.hasArg(OPT_fno_constant_cfstrings))
1803     Opts.NoConstantCFStrings = 1;
1804 
1805   if (Args.hasArg(OPT_faltivec))
1806     Opts.AltiVec = 1;
1807 
1808   if (Args.hasArg(OPT_fzvector))
1809     Opts.ZVector = 1;
1810 
1811   if (Args.hasArg(OPT_pthread))
1812     Opts.POSIXThreads = 1;
1813 
1814   // The value-visibility mode defaults to "default".
1815   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1816     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1817   } else {
1818     Opts.setValueVisibilityMode(DefaultVisibility);
1819   }
1820 
1821   // The type-visibility mode defaults to the value-visibility mode.
1822   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1823     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1824   } else {
1825     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1826   }
1827 
1828   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1829     Opts.InlineVisibilityHidden = 1;
1830 
1831   if (Args.hasArg(OPT_ftrapv)) {
1832     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1833     // Set the handler, if one is specified.
1834     Opts.OverflowHandler =
1835         Args.getLastArgValue(OPT_ftrapv_handler);
1836   }
1837   else if (Args.hasArg(OPT_fwrapv))
1838     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1839 
1840   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1841   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1842   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1843   Opts.MSCompatibilityVersion = 0;
1844   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
1845     VersionTuple VT;
1846     if (VT.tryParse(A->getValue()))
1847       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
1848                                                 << A->getValue();
1849     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
1850                                   VT.getMinor().getValueOr(0) * 100000 +
1851                                   VT.getSubminor().getValueOr(0);
1852   }
1853 
1854   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1855   // is specified, or -std is set to a conforming mode.
1856   // Trigraphs are disabled by default in c++1z onwards.
1857   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
1858   Opts.Trigraphs =
1859       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
1860 
1861   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1862                                    OPT_fno_dollars_in_identifiers,
1863                                    Opts.DollarIdents);
1864   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1865   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1866   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1867   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1868   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1869                                    Opts.ConstStrings);
1870   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1871     Opts.LaxVectorConversions = 0;
1872   if (Args.hasArg(OPT_fno_threadsafe_statics))
1873     Opts.ThreadsafeStatics = 0;
1874   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1875   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1876   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1877   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1878   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
1879   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1880 
1881   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
1882   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
1883   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
1884     && Opts.OpenCLVersion >= 200);
1885   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1886   Opts.Coroutines = Args.hasArg(OPT_fcoroutines);
1887   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
1888   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
1889   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
1890   Opts.ModulesDeclUse =
1891       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
1892   Opts.ModulesLocalVisibility =
1893       Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS;
1894   Opts.ModulesSearchAll = Opts.Modules &&
1895     !Args.hasArg(OPT_fno_modules_search_all) &&
1896     Args.hasArg(OPT_fmodules_search_all);
1897   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
1898   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
1899   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1900   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1901   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1902   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1903   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1904   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1905   if (!Opts.NoBuiltin)
1906     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
1907   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1908   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1909   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
1910   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1911   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1912   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1913   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1914   Opts.InstantiationDepth =
1915       getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
1916   Opts.ArrowDepth =
1917       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1918   Opts.ConstexprCallDepth =
1919       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1920   Opts.ConstexprStepLimit =
1921       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1922   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1923   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1924   Opts.NumLargeByValueCopy =
1925       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1926   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1927   Opts.ObjCConstantStringClass =
1928     Args.getLastArgValue(OPT_fconstant_string_class);
1929   Opts.ObjCDefaultSynthProperties =
1930     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1931   Opts.EncodeExtendedBlockSig =
1932     Args.hasArg(OPT_fencode_extended_block_signature);
1933   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1934   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1935   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
1936   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
1937   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1938   Opts.PIE = Args.hasArg(OPT_pic_is_pie);
1939   Opts.Static = Args.hasArg(OPT_static_define);
1940   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1941   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1942                         || Args.hasArg(OPT_fdump_record_layouts);
1943   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1944   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1945   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1946   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1947   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1948   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1949   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1950   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1951   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1952   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1953   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1954   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1955   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
1956   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
1957   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
1958   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
1959   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
1960   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
1961   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
1962   // is enabled.
1963   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
1964                             | Opts.NativeHalfArgsAndReturns;
1965   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
1966 
1967   // __declspec is enabled by default for the PS4 by the driver, and also
1968   // enabled for Microsoft Extensions or Borland Extensions, here.
1969   //
1970   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
1971   // CUDA extension, however it is required for supporting cuda_builtin_vars.h,
1972   // which uses __declspec(property). Once that has been rewritten in terms of
1973   // something more generic, remove the Opts.CUDA term here.
1974   Opts.DeclSpecKeyword =
1975       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
1976                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
1977 
1978   // For now, we only support local submodule visibility in C++ (because we
1979   // heavily depend on the ODR for merging redefinitions).
1980   if (Opts.ModulesLocalVisibility && !Opts.CPlusPlus)
1981     Diags.Report(diag::err_drv_argument_not_allowed_with)
1982         << "-fmodules-local-submodule-visibility" << "C";
1983 
1984   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1985     switch (llvm::StringSwitch<unsigned>(A->getValue())
1986       .Case("target", LangOptions::ASMM_Target)
1987       .Case("no", LangOptions::ASMM_Off)
1988       .Case("yes", LangOptions::ASMM_On)
1989       .Default(255)) {
1990     default:
1991       Diags.Report(diag::err_drv_invalid_value)
1992         << "-faddress-space-map-mangling=" << A->getValue();
1993       break;
1994     case LangOptions::ASMM_Target:
1995       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1996       break;
1997     case LangOptions::ASMM_On:
1998       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1999       break;
2000     case LangOptions::ASMM_Off:
2001       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
2002       break;
2003     }
2004   }
2005 
2006   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
2007     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
2008         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
2009             A->getValue())
2010             .Case("single",
2011                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
2012             .Case("multiple",
2013                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
2014             .Case("virtual",
2015                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
2016             .Default(LangOptions::PPTMK_BestCase);
2017     if (InheritanceModel == LangOptions::PPTMK_BestCase)
2018       Diags.Report(diag::err_drv_invalid_value)
2019           << "-fms-memptr-rep=" << A->getValue();
2020 
2021     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
2022   }
2023 
2024   // Check for MS default calling conventions being specified.
2025   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
2026     LangOptions::DefaultCallingConvention DefaultCC =
2027         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
2028             A->getValue())
2029             .Case("cdecl", LangOptions::DCC_CDecl)
2030             .Case("fastcall", LangOptions::DCC_FastCall)
2031             .Case("stdcall", LangOptions::DCC_StdCall)
2032             .Case("vectorcall", LangOptions::DCC_VectorCall)
2033             .Default(LangOptions::DCC_None);
2034     if (DefaultCC == LangOptions::DCC_None)
2035       Diags.Report(diag::err_drv_invalid_value)
2036           << "-fdefault-calling-conv=" << A->getValue();
2037 
2038     llvm::Triple T(TargetOpts.Triple);
2039     llvm::Triple::ArchType Arch = T.getArch();
2040     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2041                   DefaultCC == LangOptions::DCC_StdCall) &&
2042                  Arch != llvm::Triple::x86;
2043     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
2044                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2045     if (emitError)
2046       Diags.Report(diag::err_drv_argument_not_allowed_with)
2047           << A->getSpelling() << T.getTriple();
2048     else
2049       Opts.setDefaultCallingConv(DefaultCC);
2050   }
2051 
2052   // -mrtd option
2053   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2054     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2055       Diags.Report(diag::err_drv_argument_not_allowed_with)
2056           << A->getSpelling() << "-fdefault-calling-conv";
2057     else {
2058       llvm::Triple T(TargetOpts.Triple);
2059       if (T.getArch() != llvm::Triple::x86)
2060         Diags.Report(diag::err_drv_argument_not_allowed_with)
2061             << A->getSpelling() << T.getTriple();
2062       else
2063         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2064     }
2065   }
2066 
2067   // Check if -fopenmp is specified.
2068   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2069   Opts.OpenMPUseTLS =
2070       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2071   Opts.OpenMPIsDevice =
2072       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2073 
2074   if (Opts.OpenMP) {
2075     int Version =
2076         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2077     if (Version != 0)
2078       Opts.OpenMP = Version;
2079     // Provide diagnostic when a given target is not expected to be an OpenMP
2080     // device or host.
2081     if (!Opts.OpenMPIsDevice) {
2082       switch (T.getArch()) {
2083       default:
2084         break;
2085       // Add unsupported host targets here:
2086       case llvm::Triple::nvptx:
2087       case llvm::Triple::nvptx64:
2088         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2089             << TargetOpts.Triple;
2090         break;
2091       }
2092     }
2093   }
2094 
2095   // Get the OpenMP target triples if any.
2096   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
2097 
2098     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2099       llvm::Triple TT(A->getValue(i));
2100 
2101       if (TT.getArch() == llvm::Triple::UnknownArch)
2102         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2103       else
2104         Opts.OMPTargetTriples.push_back(TT);
2105     }
2106   }
2107 
2108   // Get OpenMP host file path if any and report if a non existent file is
2109   // found
2110   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
2111     Opts.OMPHostIRFile = A->getValue();
2112     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2113       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2114           << Opts.OMPHostIRFile;
2115   }
2116 
2117   // Record whether the __DEPRECATED define was requested.
2118   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2119                                  OPT_fno_deprecated_macro,
2120                                  Opts.Deprecated);
2121 
2122   // FIXME: Eliminate this dependency.
2123   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2124        OptSize = getOptimizationLevelSize(Args);
2125   Opts.Optimize = Opt != 0;
2126   Opts.OptimizeSize = OptSize != 0;
2127 
2128   // This is the __NO_INLINE__ define, which just depends on things like the
2129   // optimization level and -fno-inline, not actually whether the backend has
2130   // inlining enabled.
2131   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
2132 
2133   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2134       Args.hasArg(OPT_cl_fast_relaxed_math);
2135   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2136       Args.hasArg(OPT_cl_finite_math_only) ||
2137       Args.hasArg(OPT_cl_fast_relaxed_math);
2138   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2139                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2140                       Args.hasArg(OPT_cl_fast_relaxed_math);
2141 
2142   Opts.RetainCommentsFromSystemHeaders =
2143       Args.hasArg(OPT_fretain_comments_from_system_headers);
2144 
2145   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2146   switch (SSP) {
2147   default:
2148     Diags.Report(diag::err_drv_invalid_value)
2149       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2150     break;
2151   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2152   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2153   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2154   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2155   }
2156 
2157   // Parse -fsanitize= arguments.
2158   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2159                       Diags, Opts.Sanitize);
2160   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2161   Opts.SanitizeAddressFieldPadding =
2162       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2163   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2164 }
2165 
2166 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2167                                   FileManager &FileMgr,
2168                                   DiagnosticsEngine &Diags) {
2169   using namespace options;
2170   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2171   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2172   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2173       Opts.TokenCache = A->getValue();
2174   else
2175     Opts.TokenCache = Opts.ImplicitPTHInclude;
2176   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2177   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2178   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2179 
2180   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2181   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2182     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2183 
2184   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2185     StringRef Value(A->getValue());
2186     size_t Comma = Value.find(',');
2187     unsigned Bytes = 0;
2188     unsigned EndOfLine = 0;
2189 
2190     if (Comma == StringRef::npos ||
2191         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2192         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2193       Diags.Report(diag::err_drv_preamble_format);
2194     else {
2195       Opts.PrecompiledPreambleBytes.first = Bytes;
2196       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2197     }
2198   }
2199 
2200   // Add macros from the command line.
2201   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2202     if (A->getOption().matches(OPT_D))
2203       Opts.addMacroDef(A->getValue());
2204     else
2205       Opts.addMacroUndef(A->getValue());
2206   }
2207 
2208   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2209 
2210   // Add the ordered list of -includes.
2211   for (const Arg *A : Args.filtered(OPT_include))
2212     Opts.Includes.emplace_back(A->getValue());
2213 
2214   for (const Arg *A : Args.filtered(OPT_chain_include))
2215     Opts.ChainedIncludes.emplace_back(A->getValue());
2216 
2217   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2218     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2219 
2220     if (Split.second.empty()) {
2221       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2222       continue;
2223     }
2224 
2225     Opts.addRemappedFile(Split.first, Split.second);
2226   }
2227 
2228   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2229     StringRef Name = A->getValue();
2230     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2231       .Case("libc++", ARCXX_libcxx)
2232       .Case("libstdc++", ARCXX_libstdcxx)
2233       .Case("none", ARCXX_nolib)
2234       .Default(~0U);
2235     if (Library == ~0U)
2236       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2237     else
2238       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2239   }
2240 }
2241 
2242 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2243                                         ArgList &Args,
2244                                         frontend::ActionKind Action) {
2245   using namespace options;
2246 
2247   switch (Action) {
2248   case frontend::ASTDeclList:
2249   case frontend::ASTDump:
2250   case frontend::ASTPrint:
2251   case frontend::ASTView:
2252   case frontend::EmitAssembly:
2253   case frontend::EmitBC:
2254   case frontend::EmitHTML:
2255   case frontend::EmitLLVM:
2256   case frontend::EmitLLVMOnly:
2257   case frontend::EmitCodeGenOnly:
2258   case frontend::EmitObj:
2259   case frontend::FixIt:
2260   case frontend::GenerateModule:
2261   case frontend::GeneratePCH:
2262   case frontend::GeneratePTH:
2263   case frontend::ParseSyntaxOnly:
2264   case frontend::ModuleFileInfo:
2265   case frontend::VerifyPCH:
2266   case frontend::PluginAction:
2267   case frontend::PrintDeclContext:
2268   case frontend::RewriteObjC:
2269   case frontend::RewriteTest:
2270   case frontend::RunAnalysis:
2271   case frontend::MigrateSource:
2272     Opts.ShowCPP = 0;
2273     break;
2274 
2275   case frontend::DumpRawTokens:
2276   case frontend::DumpTokens:
2277   case frontend::InitOnly:
2278   case frontend::PrintPreamble:
2279   case frontend::PrintPreprocessedInput:
2280   case frontend::RewriteMacros:
2281   case frontend::RunPreprocessorOnly:
2282     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2283     break;
2284   }
2285 
2286   Opts.ShowComments = Args.hasArg(OPT_C);
2287   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2288   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2289   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2290   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2291   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2292 }
2293 
2294 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2295                             DiagnosticsEngine &Diags) {
2296   using namespace options;
2297   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2298   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2299     StringRef Value = A->getValue();
2300     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2301                                  .Case("default", llvm::EABI::Default)
2302                                  .Case("4", llvm::EABI::EABI4)
2303                                  .Case("5", llvm::EABI::EABI5)
2304                                  .Case("gnu", llvm::EABI::GNU)
2305                                  .Default(llvm::EABI::Unknown);
2306     if (EABIVersion == llvm::EABI::Unknown)
2307       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2308                                                 << Value;
2309     else
2310       Opts.EABIVersion = Value;
2311   }
2312   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2313   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2314   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2315   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2316   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2317   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2318   // Use the default target triple if unspecified.
2319   if (Opts.Triple.empty())
2320     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2321 }
2322 
2323 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2324                                         const char *const *ArgBegin,
2325                                         const char *const *ArgEnd,
2326                                         DiagnosticsEngine &Diags) {
2327   bool Success = true;
2328 
2329   // Parse the arguments.
2330   std::unique_ptr<OptTable> Opts(createDriverOptTable());
2331   const unsigned IncludedFlagsBitmask = options::CC1Option;
2332   unsigned MissingArgIndex, MissingArgCount;
2333   InputArgList Args =
2334       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2335                       MissingArgCount, IncludedFlagsBitmask);
2336   LangOptions &LangOpts = *Res.getLangOpts();
2337 
2338   // Check for missing argument error.
2339   if (MissingArgCount) {
2340     Diags.Report(diag::err_drv_missing_argument)
2341         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2342     Success = false;
2343   }
2344 
2345   // Issue errors on unknown arguments.
2346   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2347     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2348     Success = false;
2349   }
2350 
2351   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2352   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2353   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2354   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2355                                  false /*DefaultDiagColor*/);
2356   ParseCommentArgs(LangOpts.CommentOpts, Args);
2357   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2358   // FIXME: We shouldn't have to pass the DashX option around here
2359   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags);
2360   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2361   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2362                               Res.getTargetOpts());
2363   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args);
2364   if (DashX == IK_AST || DashX == IK_LLVM_IR) {
2365     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2366     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2367     // what the input type is.
2368     if (Args.hasArg(OPT_fobjc_arc))
2369       LangOpts.ObjCAutoRefCount = 1;
2370     // PIClevel and PIELevel are needed during code generation and this should be
2371     // set regardless of the input type.
2372     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2373     LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
2374     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2375                         Diags, LangOpts.Sanitize);
2376   } else {
2377     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2378     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
2379       Res.getPreprocessorOpts(), Diags);
2380     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2381       LangOpts.ObjCExceptions = 1;
2382   }
2383 
2384   if (LangOpts.CUDA) {
2385     // During CUDA device-side compilation, the aux triple is the
2386     // triple used for host compilation.
2387     if (LangOpts.CUDAIsDevice)
2388       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2389 
2390     // Set default FP_CONTRACT to FAST.
2391     if (!Args.hasArg(OPT_ffp_contract))
2392       Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
2393   }
2394 
2395   // FIXME: Override value name discarding when asan or msan is used because the
2396   // backend passes depend on the name of the alloca in order to print out
2397   // names.
2398   Res.getCodeGenOpts().DiscardValueNames &=
2399       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2400       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2401 
2402   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2403   // PCH file and find the original header name. Remove the need to do that in
2404   // ParsePreprocessorArgs and remove the FileManager
2405   // parameters from the function and the "FileManager.h" #include.
2406   FileManager FileMgr(Res.getFileSystemOpts());
2407   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags);
2408   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2409                               Res.getFrontendOpts().ProgramAction);
2410 
2411   // Turn on -Wspir-compat for SPIR target.
2412   llvm::Triple T(Res.getTargetOpts().Triple);
2413   auto Arch = T.getArch();
2414   if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) {
2415     Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
2416   }
2417   return Success;
2418 }
2419 
2420 std::string CompilerInvocation::getModuleHash() const {
2421   // Note: For QoI reasons, the things we use as a hash here should all be
2422   // dumped via the -module-info flag.
2423   using llvm::hash_code;
2424   using llvm::hash_value;
2425   using llvm::hash_combine;
2426 
2427   // Start the signature with the compiler version.
2428   // FIXME: We'd rather use something more cryptographically sound than
2429   // CityHash, but this will do for now.
2430   hash_code code = hash_value(getClangFullRepositoryVersion());
2431 
2432   // Extend the signature with the language options
2433 #define LANGOPT(Name, Bits, Default, Description) \
2434    code = hash_combine(code, LangOpts->Name);
2435 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2436   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2437 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2438 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2439 #include "clang/Basic/LangOptions.def"
2440 
2441   for (StringRef Feature : LangOpts->ModuleFeatures)
2442     code = hash_combine(code, Feature);
2443 
2444   // Extend the signature with the target options.
2445   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2446                       TargetOpts->ABI);
2447   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2448     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2449 
2450   // Extend the signature with preprocessor options.
2451   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2452   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2453   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2454 
2455   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2456             I = getPreprocessorOpts().Macros.begin(),
2457          IEnd = getPreprocessorOpts().Macros.end();
2458        I != IEnd; ++I) {
2459     // If we're supposed to ignore this macro for the purposes of modules,
2460     // don't put it into the hash.
2461     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2462       // Check whether we're ignoring this macro.
2463       StringRef MacroDef = I->first;
2464       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
2465         continue;
2466     }
2467 
2468     code = hash_combine(code, I->first, I->second);
2469   }
2470 
2471   // Extend the signature with the sysroot and other header search options.
2472   code = hash_combine(code, hsOpts.Sysroot,
2473                       hsOpts.ModuleFormat,
2474                       hsOpts.UseDebugInfo,
2475                       hsOpts.UseBuiltinIncludes,
2476                       hsOpts.UseStandardSystemIncludes,
2477                       hsOpts.UseStandardCXXIncludes,
2478                       hsOpts.UseLibcxx,
2479                       hsOpts.ModulesValidateDiagnosticOptions);
2480   code = hash_combine(code, hsOpts.ResourceDir);
2481 
2482   // Extend the signature with the user build path.
2483   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2484 
2485   // Extend the signature with the module file extensions.
2486   const FrontendOptions &frontendOpts = getFrontendOpts();
2487   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2488     code = ext->hashExtension(code);
2489   }
2490 
2491   // Darwin-specific hack: if we have a sysroot, use the contents and
2492   // modification time of
2493   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
2494   // as part of the module hash.
2495   if (!hsOpts.Sysroot.empty()) {
2496     SmallString<128> systemVersionFile;
2497     systemVersionFile += hsOpts.Sysroot;
2498     llvm::sys::path::append(systemVersionFile, "System");
2499     llvm::sys::path::append(systemVersionFile, "Library");
2500     llvm::sys::path::append(systemVersionFile, "CoreServices");
2501     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
2502 
2503     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer =
2504         llvm::MemoryBuffer::getFile(systemVersionFile);
2505     if (buffer) {
2506       code = hash_combine(code, buffer.get()->getBuffer());
2507 
2508       struct stat statBuf;
2509       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
2510         code = hash_combine(code, statBuf.st_mtime);
2511     }
2512   }
2513 
2514   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2515 }
2516 
2517 namespace clang {
2518 
2519 template<typename IntTy>
2520 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2521                                     IntTy Default,
2522                                     DiagnosticsEngine *Diags) {
2523   IntTy Res = Default;
2524   if (Arg *A = Args.getLastArg(Id)) {
2525     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2526       if (Diags)
2527         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2528                                                        << A->getValue();
2529     }
2530   }
2531   return Res;
2532 }
2533 
2534 
2535 // Declared in clang/Frontend/Utils.h.
2536 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2537                        DiagnosticsEngine *Diags) {
2538   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2539 }
2540 
2541 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2542                                uint64_t Default,
2543                                DiagnosticsEngine *Diags) {
2544   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2545 }
2546 
2547 void BuryPointer(const void *Ptr) {
2548   // This function may be called only a small fixed amount of times per each
2549   // invocation, otherwise we do actually have a leak which we want to report.
2550   // If this function is called more than kGraveYardMaxSize times, the pointers
2551   // will not be properly buried and a leak detector will report a leak, which
2552   // is what we want in such case.
2553   static const size_t kGraveYardMaxSize = 16;
2554   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2555   static std::atomic<unsigned> GraveYardSize;
2556   unsigned Idx = GraveYardSize++;
2557   if (Idx >= kGraveYardMaxSize)
2558     return;
2559   GraveYard[Idx] = Ptr;
2560 }
2561 
2562 IntrusiveRefCntPtr<vfs::FileSystem>
2563 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2564                                 DiagnosticsEngine &Diags) {
2565   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2566     return vfs::getRealFileSystem();
2567 
2568   IntrusiveRefCntPtr<vfs::OverlayFileSystem>
2569     Overlay(new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
2570   // earlier vfs files are on the bottom
2571   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2572     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2573         llvm::MemoryBuffer::getFile(File);
2574     if (!Buffer) {
2575       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2576       return IntrusiveRefCntPtr<vfs::FileSystem>();
2577     }
2578 
2579     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2580         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2581     if (!FS.get()) {
2582       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2583       return IntrusiveRefCntPtr<vfs::FileSystem>();
2584     }
2585     Overlay->pushOverlay(FS);
2586   }
2587   return Overlay;
2588 }
2589 } // end namespace clang
2590