xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision 9181e7750465bf645dbf761125ec12f846236cd3)
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     if (S == "g")
102       return 1;
103 
104     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
105   }
106 
107   return DefaultOpt;
108 }
109 
110 static unsigned getOptimizationLevelSize(ArgList &Args) {
111   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
112     if (A->getOption().matches(options::OPT_O)) {
113       switch (A->getValue()[0]) {
114       default:
115         return 0;
116       case 's':
117         return 1;
118       case 'z':
119         return 2;
120       }
121     }
122   }
123   return 0;
124 }
125 
126 static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
127                               OptSpecifier GroupWithValue,
128                               std::vector<std::string> &Diagnostics) {
129   for (Arg *A : Args.filtered(Group)) {
130     if (A->getOption().getKind() == Option::FlagClass) {
131       // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
132       // its name (minus the "W" or "R" at the beginning) to the warning list.
133       Diagnostics.push_back(A->getOption().getName().drop_front(1));
134     } else if (A->getOption().matches(GroupWithValue)) {
135       // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
136       Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
137     } else {
138       // Otherwise, add its value (for OPT_W_Joined and similar).
139       for (const char *Arg : A->getValues())
140         Diagnostics.emplace_back(Arg);
141     }
142   }
143 }
144 
145 static void getAllNoBuiltinFuncValues(ArgList &Args,
146                                       std::vector<std::string> &Funcs) {
147   SmallVector<const char *, 8> Values;
148   for (const auto &Arg : Args) {
149     const Option &O = Arg->getOption();
150     if (O.matches(options::OPT_fno_builtin_)) {
151       const char *FuncName = Arg->getValue();
152       if (Builtin::Context::isBuiltinFunc(FuncName))
153         Values.push_back(FuncName);
154     }
155   }
156   Funcs.insert(Funcs.end(), Values.begin(), Values.end());
157 }
158 
159 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
160                               DiagnosticsEngine &Diags) {
161   using namespace options;
162   bool Success = true;
163   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
164     StringRef Name = A->getValue();
165     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
166 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
167       .Case(CMDFLAG, NAME##Model)
168 #include "clang/StaticAnalyzer/Core/Analyses.def"
169       .Default(NumStores);
170     if (Value == NumStores) {
171       Diags.Report(diag::err_drv_invalid_value)
172         << A->getAsString(Args) << Name;
173       Success = false;
174     } else {
175       Opts.AnalysisStoreOpt = Value;
176     }
177   }
178 
179   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
180     StringRef Name = A->getValue();
181     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
182 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
183       .Case(CMDFLAG, NAME##Model)
184 #include "clang/StaticAnalyzer/Core/Analyses.def"
185       .Default(NumConstraints);
186     if (Value == NumConstraints) {
187       Diags.Report(diag::err_drv_invalid_value)
188         << A->getAsString(Args) << Name;
189       Success = false;
190     } else {
191       Opts.AnalysisConstraintsOpt = Value;
192     }
193   }
194 
195   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
196     StringRef Name = A->getValue();
197     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
198 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
199       .Case(CMDFLAG, PD_##NAME)
200 #include "clang/StaticAnalyzer/Core/Analyses.def"
201       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
202     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
203       Diags.Report(diag::err_drv_invalid_value)
204         << A->getAsString(Args) << Name;
205       Success = false;
206     } else {
207       Opts.AnalysisDiagOpt = Value;
208     }
209   }
210 
211   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
212     StringRef Name = A->getValue();
213     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
214 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
215       .Case(CMDFLAG, NAME)
216 #include "clang/StaticAnalyzer/Core/Analyses.def"
217       .Default(NumPurgeModes);
218     if (Value == NumPurgeModes) {
219       Diags.Report(diag::err_drv_invalid_value)
220         << A->getAsString(Args) << Name;
221       Success = false;
222     } else {
223       Opts.AnalysisPurgeOpt = Value;
224     }
225   }
226 
227   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
228     StringRef Name = A->getValue();
229     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
230 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
231       .Case(CMDFLAG, NAME)
232 #include "clang/StaticAnalyzer/Core/Analyses.def"
233       .Default(NumInliningModes);
234     if (Value == NumInliningModes) {
235       Diags.Report(diag::err_drv_invalid_value)
236         << A->getAsString(Args) << Name;
237       Success = false;
238     } else {
239       Opts.InliningMode = Value;
240     }
241   }
242 
243   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
244   Opts.ShowEnabledCheckerList = Args.hasArg(OPT_analyzer_list_enabled_checkers);
245   Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
246 
247   Opts.visualizeExplodedGraphWithGraphViz =
248     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
249   Opts.visualizeExplodedGraphWithUbiGraph =
250     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
251   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
252   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
253   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
254   Opts.AnalyzeNestedBlocks =
255     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
256   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
257   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
258   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
259   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
260   Opts.maxBlockVisitOnPath =
261       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
262   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
263   Opts.InlineMaxStackDepth =
264       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
265                          Opts.InlineMaxStackDepth, Diags);
266 
267   Opts.CheckersControlList.clear();
268   for (const Arg *A :
269        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
270     A->claim();
271     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
272     // We can have a list of comma separated checker names, e.g:
273     // '-analyzer-checker=cocoa,unix'
274     StringRef checkerList = A->getValue();
275     SmallVector<StringRef, 4> checkers;
276     checkerList.split(checkers, ",");
277     for (StringRef checker : checkers)
278       Opts.CheckersControlList.emplace_back(checker, enable);
279   }
280 
281   // Go through the analyzer configuration options.
282   for (const Arg *A : Args.filtered(OPT_analyzer_config)) {
283     A->claim();
284     // We can have a list of comma separated config names, e.g:
285     // '-analyzer-config key1=val1,key2=val2'
286     StringRef configList = A->getValue();
287     SmallVector<StringRef, 4> configVals;
288     configList.split(configVals, ",");
289     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
290       StringRef key, val;
291       std::tie(key, val) = configVals[i].split("=");
292       if (val.empty()) {
293         Diags.Report(SourceLocation(),
294                      diag::err_analyzer_config_no_value) << configVals[i];
295         Success = false;
296         break;
297       }
298       if (val.find('=') != StringRef::npos) {
299         Diags.Report(SourceLocation(),
300                      diag::err_analyzer_config_multiple_values)
301           << configVals[i];
302         Success = false;
303         break;
304       }
305       Opts.Config[key] = val;
306     }
307   }
308 
309   return Success;
310 }
311 
312 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
313   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
314   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
315   return true;
316 }
317 
318 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
319   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
320   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
321 }
322 
323 static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
324   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
325     StringRef Value = A->getValue();
326     if (Value == "small" || Value == "kernel" || Value == "medium" ||
327         Value == "large")
328       return Value;
329     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
330   }
331   return "default";
332 }
333 
334 /// \brief Create a new Regex instance out of the string value in \p RpassArg.
335 /// It returns a pointer to the newly generated Regex instance.
336 static std::shared_ptr<llvm::Regex>
337 GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
338                                 Arg *RpassArg) {
339   StringRef Val = RpassArg->getValue();
340   std::string RegexError;
341   std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
342   if (!Pattern->isValid(RegexError)) {
343     Diags.Report(diag::err_drv_optimization_remark_pattern)
344         << RegexError << RpassArg->getAsString(Args);
345     Pattern.reset();
346   }
347   return Pattern;
348 }
349 
350 static bool parseDiagnosticLevelMask(StringRef FlagName,
351                                      const std::vector<std::string> &Levels,
352                                      DiagnosticsEngine *Diags,
353                                      DiagnosticLevelMask &M) {
354   bool Success = true;
355   for (const auto &Level : Levels) {
356     DiagnosticLevelMask const PM =
357       llvm::StringSwitch<DiagnosticLevelMask>(Level)
358         .Case("note",    DiagnosticLevelMask::Note)
359         .Case("remark",  DiagnosticLevelMask::Remark)
360         .Case("warning", DiagnosticLevelMask::Warning)
361         .Case("error",   DiagnosticLevelMask::Error)
362         .Default(DiagnosticLevelMask::None);
363     if (PM == DiagnosticLevelMask::None) {
364       Success = false;
365       if (Diags)
366         Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
367     }
368     M = M | PM;
369   }
370   return Success;
371 }
372 
373 static void parseSanitizerKinds(StringRef FlagName,
374                                 const std::vector<std::string> &Sanitizers,
375                                 DiagnosticsEngine &Diags, SanitizerSet &S) {
376   for (const auto &Sanitizer : Sanitizers) {
377     SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
378     if (K == 0)
379       Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
380     else
381       S.set(K, true);
382   }
383 }
384 
385 // Set the profile kind for fprofile-instrument.
386 static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
387                                DiagnosticsEngine &Diags) {
388   Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
389   if (A == nullptr)
390     return;
391   StringRef S = A->getValue();
392   unsigned I = llvm::StringSwitch<unsigned>(S)
393                    .Case("none", CodeGenOptions::ProfileNone)
394                    .Case("clang", CodeGenOptions::ProfileClangInstr)
395                    .Case("llvm", CodeGenOptions::ProfileIRInstr)
396                    .Default(~0U);
397   if (I == ~0U) {
398     Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
399                                                          << S;
400     return;
401   }
402   CodeGenOptions::ProfileInstrKind Instrumentor =
403       static_cast<CodeGenOptions::ProfileInstrKind>(I);
404   Opts.setProfileInstr(Instrumentor);
405 }
406 
407 // Set the profile kind using fprofile-instrument-use-path.
408 static void setPGOUseInstrumentor(CodeGenOptions &Opts,
409                                   const Twine &ProfileName) {
410   auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
411   // In error, return silently and let Clang PGOUse report the error message.
412   if (auto E = ReaderOrErr.takeError()) {
413     llvm::consumeError(std::move(E));
414     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
415     return;
416   }
417   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
418     std::move(ReaderOrErr.get());
419   if (PGOReader->isIRLevelProfile())
420     Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
421   else
422     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
423 }
424 
425 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
426                              DiagnosticsEngine &Diags,
427                              const TargetOptions &TargetOpts) {
428   using namespace options;
429   bool Success = true;
430   llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
431 
432   unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
433   // TODO: This could be done in Driver
434   unsigned MaxOptLevel = 3;
435   if (OptimizationLevel > MaxOptLevel) {
436     // If the optimization level is not supported, fall back on the default
437     // optimization
438     Diags.Report(diag::warn_drv_optimization_value)
439         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
440     OptimizationLevel = MaxOptLevel;
441   }
442   Opts.OptimizationLevel = OptimizationLevel;
443 
444   // We must always run at least the always inlining pass.
445   Opts.setInlining(
446     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
447                                  : CodeGenOptions::OnlyAlwaysInlining);
448   // -fno-inline-functions overrides OptimizationLevel > 1.
449   Opts.NoInline = Args.hasArg(OPT_fno_inline);
450   if (Arg* InlineArg = Args.getLastArg(options::OPT_finline_functions,
451                                        options::OPT_finline_hint_functions,
452                                        options::OPT_fno_inline_functions)) {
453     const Option& InlineOpt = InlineArg->getOption();
454     if (InlineOpt.matches(options::OPT_finline_functions))
455       Opts.setInlining(CodeGenOptions::NormalInlining);
456     else if (InlineOpt.matches(options::OPT_finline_hint_functions))
457       Opts.setInlining(CodeGenOptions::OnlyHintInlining);
458     else
459       Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
460   }
461 
462   if (Arg *A = Args.getLastArg(OPT_fveclib)) {
463     StringRef Name = A->getValue();
464     if (Name == "Accelerate")
465       Opts.setVecLib(CodeGenOptions::Accelerate);
466     else if (Name == "SVML")
467       Opts.setVecLib(CodeGenOptions::SVML);
468     else if (Name == "none")
469       Opts.setVecLib(CodeGenOptions::NoLibrary);
470     else
471       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
472   }
473 
474   if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
475     unsigned Val =
476         llvm::StringSwitch<unsigned>(A->getValue())
477             .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
478             .Case("limited", codegenoptions::LimitedDebugInfo)
479             .Case("standalone", codegenoptions::FullDebugInfo)
480             .Default(~0U);
481     if (Val == ~0U)
482       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
483                                                 << A->getValue();
484     else
485       Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
486   }
487   if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
488     unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
489                        .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
490                        .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
491                        .Case("sce", unsigned(llvm::DebuggerKind::SCE))
492                        .Default(~0U);
493     if (Val == ~0U)
494       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
495                                                 << A->getValue();
496     else
497       Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
498   }
499   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
500   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
501   Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
502   Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
503   Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
504   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
505   Opts.SplitDwarfInlining = !Args.hasArg(OPT_fno_split_dwarf_inlining);
506   Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
507   Opts.DebugExplicitImport = Triple.isPS4CPU();
508 
509   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
510     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
511 
512   if (const Arg *A =
513           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
514     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
515 
516   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
517   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
518   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
519   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
520   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
521     OPT_fuse_register_sized_bitfield_access);
522   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
523   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
524   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
525   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
526   Opts.NoCommon = Args.hasArg(OPT_fno_common);
527   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
528   Opts.OptimizeSize = getOptimizationLevelSize(Args);
529   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
530                             Args.hasArg(OPT_ffreestanding));
531   if (Opts.SimplifyLibCalls)
532     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
533   Opts.UnrollLoops =
534       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
535                    (Opts.OptimizationLevel > 1));
536   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
537 
538   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
539   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
540   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
541 
542   setPGOInstrumentor(Opts, Args, Diags);
543   Opts.InstrProfileOutput =
544       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
545   Opts.ProfileInstrumentUsePath =
546       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
547   if (!Opts.ProfileInstrumentUsePath.empty())
548     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
549 
550   Opts.CoverageMapping =
551       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
552   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
553   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
554   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
555   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
556   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
557   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
558   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
559   Opts.CodeModel = getCodeModel(Args, Diags);
560   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
561   Opts.DisableFPElim =
562       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
563   Opts.DisableFree = Args.hasArg(OPT_disable_free);
564   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
565   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
566   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
567   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
568   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
569   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
570                        Args.hasArg(OPT_cl_finite_math_only) ||
571                        Args.hasArg(OPT_cl_fast_relaxed_math));
572   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
573                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
574                        Args.hasArg(OPT_cl_finite_math_only) ||
575                        Args.hasArg(OPT_cl_fast_relaxed_math));
576   Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
577                         Args.hasArg(OPT_cl_no_signed_zeros));
578   Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero);
579   Opts.CorrectlyRoundedDivSqrt =
580       Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
581   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
582   Opts.NoTrappingMath = Args.hasArg(OPT_fno_trapping_math);
583   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
584   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
585   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
586   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
587   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
588   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
589   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
590   Opts.IncrementalLinkerCompatible =
591       Args.hasArg(OPT_mincremental_linker_compatible);
592   Opts.PIECopyRelocations =
593       Args.hasArg(OPT_mpie_copy_relocations);
594   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
595   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
596   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
597   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
598   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
599   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
600   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
601                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
602                       Args.hasArg(OPT_cl_fast_relaxed_math);
603   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
604   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
605   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
606   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
607     Diags.Report(diag::err_drv_invalid_value)
608         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
609         << Opts.ThreadModel;
610   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
611   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
612 
613   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
614                                        OPT_fno_function_sections, false);
615   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
616                                    OPT_fno_data_sections, false);
617   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
618                                          OPT_fno_unique_section_names, true);
619 
620   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
621 
622   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
623 
624   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
625   const Arg *A = Args.getLastArg(OPT_flto, OPT_flto_EQ);
626   Opts.EmitSummaryIndex = A && A->containsValue("thin");
627   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
628     if (IK != IK_LLVM_IR)
629       Diags.Report(diag::err_drv_argument_only_allowed_with)
630           << A->getAsString(Args) << "-x ir";
631     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
632   }
633 
634   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
635 
636   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
637   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
638   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
639 
640   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
641   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
642 
643   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
644   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
645   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
646   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
647     Opts.CoverageDataFile = Args.getLastArgValue(OPT_coverage_data_file);
648     Opts.CoverageNotesFile = Args.getLastArgValue(OPT_coverage_notes_file);
649     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
650     Opts.CoverageNoFunctionNamesInData =
651         Args.hasArg(OPT_coverage_no_function_names_in_data);
652     Opts.CoverageExitBlockBeforeBody =
653         Args.hasArg(OPT_coverage_exit_block_before_body);
654     if (Args.hasArg(OPT_coverage_version_EQ)) {
655       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
656       if (CoverageVersion.size() != 4) {
657         Diags.Report(diag::err_drv_invalid_value)
658             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
659             << CoverageVersion;
660       } else {
661         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
662       }
663     }
664   }
665 	// Handle -fembed-bitcode option.
666   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
667     StringRef Name = A->getValue();
668     unsigned Model = llvm::StringSwitch<unsigned>(Name)
669         .Case("off", CodeGenOptions::Embed_Off)
670         .Case("all", CodeGenOptions::Embed_All)
671         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
672         .Case("marker", CodeGenOptions::Embed_Marker)
673         .Default(~0U);
674     if (Model == ~0U) {
675       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
676       Success = false;
677     } else
678       Opts.setEmbedBitcode(
679           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
680   }
681   // FIXME: For backend options that are not yet recorded as function
682   // attributes in the IR, keep track of them so we can embed them in a
683   // separate data section and use them when building the bitcode.
684   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
685     for (const auto &A : Args) {
686       // Do not encode output and input.
687       if (A->getOption().getID() == options::OPT_o ||
688           A->getOption().getID() == options::OPT_INPUT ||
689           A->getOption().getID() == options::OPT_x ||
690           A->getOption().getID() == options::OPT_fembed_bitcode ||
691           (A->getOption().getGroup().isValid() &&
692            A->getOption().getGroup().getID() == options::OPT_W_Group))
693         continue;
694       ArgStringList ASL;
695       A->render(Args, ASL);
696       for (const auto &arg : ASL) {
697         StringRef ArgStr(arg);
698         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
699         // using \00 to seperate each commandline options.
700         Opts.CmdArgs.push_back('\0');
701       }
702     }
703   }
704 
705   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
706   Opts.XRayInstrumentFunctions = Args.hasArg(OPT_fxray_instrument);
707   Opts.XRayInstructionThreshold =
708       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_, 200, Diags);
709   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
710   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
711   Opts.CompressDebugSections = Args.hasArg(OPT_compress_debug_sections);
712   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
713   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
714   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
715     unsigned LinkFlags = llvm::Linker::Flags::None;
716     if (A->getOption().matches(OPT_mlink_cuda_bitcode))
717       LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded |
718                   llvm::Linker::Flags::InternalizeLinkedSymbols;
719     Opts.LinkBitcodeFiles.push_back(std::make_pair(LinkFlags, A->getValue()));
720   }
721   Opts.SanitizeCoverageType =
722       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
723   Opts.SanitizeCoverageIndirectCalls =
724       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
725   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
726   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
727   Opts.SanitizeCoverageTraceDiv = Args.hasArg(OPT_fsanitize_coverage_trace_div);
728   Opts.SanitizeCoverageTraceGep = Args.hasArg(OPT_fsanitize_coverage_trace_gep);
729   Opts.SanitizeCoverage8bitCounters =
730       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
731   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
732   Opts.SanitizeCoverageTracePCGuard =
733       Args.hasArg(OPT_fsanitize_coverage_trace_pc_guard);
734   Opts.SanitizeMemoryTrackOrigins =
735       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
736   Opts.SanitizeMemoryUseAfterDtor =
737       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
738   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
739   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
740   if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_after_scope,
741                                OPT_fno_sanitize_address_use_after_scope)) {
742     Opts.SanitizeAddressUseAfterScope =
743         A->getOption().getID() == OPT_fsanitize_address_use_after_scope;
744   }
745   Opts.SSPBufferSize =
746       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
747   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
748   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
749     StringRef Val = A->getValue();
750     unsigned StackAlignment = Opts.StackAlignment;
751     Val.getAsInteger(10, StackAlignment);
752     Opts.StackAlignment = StackAlignment;
753   }
754 
755   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
756     StringRef Val = A->getValue();
757     unsigned StackProbeSize = Opts.StackProbeSize;
758     Val.getAsInteger(0, StackProbeSize);
759     Opts.StackProbeSize = StackProbeSize;
760   }
761 
762   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
763     StringRef Name = A->getValue();
764     unsigned Method = llvm::StringSwitch<unsigned>(Name)
765       .Case("legacy", CodeGenOptions::Legacy)
766       .Case("non-legacy", CodeGenOptions::NonLegacy)
767       .Case("mixed", CodeGenOptions::Mixed)
768       .Default(~0U);
769     if (Method == ~0U) {
770       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
771       Success = false;
772     } else {
773       Opts.setObjCDispatchMethod(
774         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
775     }
776   }
777 
778   Opts.EmulatedTLS =
779       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
780 
781   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
782     StringRef Name = A->getValue();
783     unsigned Model = llvm::StringSwitch<unsigned>(Name)
784         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
785         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
786         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
787         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
788         .Default(~0U);
789     if (Model == ~0U) {
790       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
791       Success = false;
792     } else {
793       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
794     }
795   }
796 
797   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
798     StringRef Val = A->getValue();
799     if (Val == "fast")
800       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
801     else if (Val == "on")
802       Opts.setFPContractMode(CodeGenOptions::FPC_On);
803     else if (Val == "off")
804       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
805     else
806       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
807   }
808 
809   if (Arg *A = Args.getLastArg(OPT_fdenormal_fp_math_EQ)) {
810     StringRef Val = A->getValue();
811     if (Val == "ieee")
812       Opts.FPDenormalMode = "ieee";
813     else if (Val == "preserve-sign")
814       Opts.FPDenormalMode = "preserve-sign";
815     else if (Val == "positive-zero")
816       Opts.FPDenormalMode = "positive-zero";
817     else
818       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
819   }
820 
821   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
822     if (A->getOption().matches(OPT_fpcc_struct_return)) {
823       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
824     } else {
825       assert(A->getOption().matches(OPT_freg_struct_return));
826       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
827     }
828   }
829 
830   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
831   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
832   bool NeedLocTracking = false;
833 
834   Opts.OptRecordFile = Args.getLastArgValue(OPT_opt_record_file);
835   if (!Opts.OptRecordFile.empty())
836     NeedLocTracking = true;
837 
838   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
839     Opts.OptimizationRemarkPattern =
840         GenerateOptimizationRemarkRegex(Diags, Args, A);
841     NeedLocTracking = true;
842   }
843 
844   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
845     Opts.OptimizationRemarkMissedPattern =
846         GenerateOptimizationRemarkRegex(Diags, Args, A);
847     NeedLocTracking = true;
848   }
849 
850   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
851     Opts.OptimizationRemarkAnalysisPattern =
852         GenerateOptimizationRemarkRegex(Diags, Args, A);
853     NeedLocTracking = true;
854   }
855 
856   Opts.DiagnosticsWithHotness =
857       Args.hasArg(options::OPT_fdiagnostics_show_hotness);
858   if (Opts.DiagnosticsWithHotness &&
859       Opts.getProfileUse() == CodeGenOptions::ProfileNone)
860     Diags.Report(diag::warn_drv_fdiagnostics_show_hotness_requires_pgo);
861 
862   // If the user requested to use a sample profile for PGO, then the
863   // backend will need to track source location information so the profile
864   // can be incorporated into the IR.
865   if (!Opts.SampleProfileFile.empty())
866     NeedLocTracking = true;
867 
868   // If the user requested a flag that requires source locations available in
869   // the backend, make sure that the backend tracks source location information.
870   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
871     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
872 
873   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
874 
875   // Parse -fsanitize-recover= arguments.
876   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
877   parseSanitizerKinds("-fsanitize-recover=",
878                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
879                       Opts.SanitizeRecover);
880   parseSanitizerKinds("-fsanitize-trap=",
881                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
882                       Opts.SanitizeTrap);
883 
884   Opts.CudaGpuBinaryFileNames =
885       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
886 
887   Opts.Backchain = Args.hasArg(OPT_mbackchain);
888 
889   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
890       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
891 
892   return Success;
893 }
894 
895 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
896                                       ArgList &Args) {
897   using namespace options;
898   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
899   Opts.Targets = Args.getAllArgValues(OPT_MT);
900   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
901   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
902   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
903   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
904   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
905   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
906   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
907   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
908   Opts.ModuleDependencyOutputDir =
909       Args.getLastArgValue(OPT_module_dependency_dir);
910   if (Args.hasArg(OPT_MV))
911     Opts.OutputFormat = DependencyOutputFormat::NMake;
912   // Add sanitizer blacklists as extra dependencies.
913   // They won't be discovered by the regular preprocessor, so
914   // we let make / ninja to know about this implicit dependency.
915   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
916   auto ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
917   Opts.ExtraDeps.insert(Opts.ExtraDeps.end(), ModuleFiles.begin(),
918                         ModuleFiles.end());
919 }
920 
921 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
922   // Color diagnostics default to auto ("on" if terminal supports) in the driver
923   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
924   // Support both clang's -f[no-]color-diagnostics and gcc's
925   // -f[no-]diagnostics-colors[=never|always|auto].
926   enum {
927     Colors_On,
928     Colors_Off,
929     Colors_Auto
930   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
931   for (Arg *A : Args) {
932     const Option &O = A->getOption();
933     if (O.matches(options::OPT_fcolor_diagnostics) ||
934         O.matches(options::OPT_fdiagnostics_color)) {
935       ShowColors = Colors_On;
936     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
937                O.matches(options::OPT_fno_diagnostics_color)) {
938       ShowColors = Colors_Off;
939     } else if (O.matches(options::OPT_fdiagnostics_color_EQ)) {
940       StringRef Value(A->getValue());
941       if (Value == "always")
942         ShowColors = Colors_On;
943       else if (Value == "never")
944         ShowColors = Colors_Off;
945       else if (Value == "auto")
946         ShowColors = Colors_Auto;
947     }
948   }
949   return ShowColors == Colors_On ||
950          (ShowColors == Colors_Auto &&
951           llvm::sys::Process::StandardErrHasColors());
952 }
953 
954 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
955                                 DiagnosticsEngine *Diags,
956                                 bool DefaultDiagColor, bool DefaultShowOpt) {
957   using namespace options;
958   bool Success = true;
959 
960   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
961   if (Arg *A =
962           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
963     Opts.DiagnosticSerializationFile = A->getValue();
964   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
965   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
966   Opts.Pedantic = Args.hasArg(OPT_pedantic);
967   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
968   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
969   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
970   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
971                                  OPT_fno_show_column,
972                                  /*Default=*/true);
973   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
974   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
975   Opts.AbsolutePath = Args.hasArg(OPT_fdiagnostics_absolute_paths);
976   Opts.ShowOptionNames =
977       Args.hasFlag(OPT_fdiagnostics_show_option,
978                    OPT_fno_diagnostics_show_option, DefaultShowOpt);
979 
980   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
981 
982   // Default behavior is to not to show note include stacks.
983   Opts.ShowNoteIncludeStack = false;
984   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
985                                OPT_fno_diagnostics_show_note_include_stack))
986     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
987       Opts.ShowNoteIncludeStack = true;
988 
989   StringRef ShowOverloads =
990     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
991   if (ShowOverloads == "best")
992     Opts.setShowOverloads(Ovl_Best);
993   else if (ShowOverloads == "all")
994     Opts.setShowOverloads(Ovl_All);
995   else {
996     Success = false;
997     if (Diags)
998       Diags->Report(diag::err_drv_invalid_value)
999       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
1000       << ShowOverloads;
1001   }
1002 
1003   StringRef ShowCategory =
1004     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
1005   if (ShowCategory == "none")
1006     Opts.ShowCategories = 0;
1007   else if (ShowCategory == "id")
1008     Opts.ShowCategories = 1;
1009   else if (ShowCategory == "name")
1010     Opts.ShowCategories = 2;
1011   else {
1012     Success = false;
1013     if (Diags)
1014       Diags->Report(diag::err_drv_invalid_value)
1015       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
1016       << ShowCategory;
1017   }
1018 
1019   StringRef Format =
1020     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
1021   if (Format == "clang")
1022     Opts.setFormat(DiagnosticOptions::Clang);
1023   else if (Format == "msvc")
1024     Opts.setFormat(DiagnosticOptions::MSVC);
1025   else if (Format == "msvc-fallback") {
1026     Opts.setFormat(DiagnosticOptions::MSVC);
1027     Opts.CLFallbackMode = true;
1028   } else if (Format == "vi")
1029     Opts.setFormat(DiagnosticOptions::Vi);
1030   else {
1031     Success = false;
1032     if (Diags)
1033       Diags->Report(diag::err_drv_invalid_value)
1034       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
1035       << Format;
1036   }
1037 
1038   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
1039   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
1040   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
1041   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
1042   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
1043   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
1044     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
1045     Diags, DiagMask);
1046   if (Args.hasArg(OPT_verify_ignore_unexpected))
1047     DiagMask = DiagnosticLevelMask::All;
1048   Opts.setVerifyIgnoreUnexpected(DiagMask);
1049   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1050   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1051   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1052   Opts.MacroBacktraceLimit =
1053       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1054                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1055   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1056       Args, OPT_ftemplate_backtrace_limit,
1057       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1058   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1059       Args, OPT_fconstexpr_backtrace_limit,
1060       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1061   Opts.SpellCheckingLimit = getLastArgIntValue(
1062       Args, OPT_fspell_checking_limit,
1063       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1064   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1065                                     DiagnosticOptions::DefaultTabStop, Diags);
1066   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1067     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1068     if (Diags)
1069       Diags->Report(diag::warn_ignoring_ftabstop_value)
1070       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1071   }
1072   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1073   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1074   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1075 
1076   return Success;
1077 }
1078 
1079 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1080   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1081 }
1082 
1083 /// Parse the argument to the -ftest-module-file-extension
1084 /// command-line argument.
1085 ///
1086 /// \returns true on error, false on success.
1087 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1088                                             std::string &BlockName,
1089                                             unsigned &MajorVersion,
1090                                             unsigned &MinorVersion,
1091                                             bool &Hashed,
1092                                             std::string &UserInfo) {
1093   SmallVector<StringRef, 5> Args;
1094   Arg.split(Args, ':', 5);
1095   if (Args.size() < 5)
1096     return true;
1097 
1098   BlockName = Args[0];
1099   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1100   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1101   if (Args[3].getAsInteger(2, Hashed)) return true;
1102   if (Args.size() > 4)
1103     UserInfo = Args[4];
1104   return false;
1105 }
1106 
1107 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1108                                    DiagnosticsEngine &Diags,
1109                                    bool &IsHeaderFile) {
1110   using namespace options;
1111   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1112   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1113     switch (A->getOption().getID()) {
1114     default:
1115       llvm_unreachable("Invalid option in group!");
1116     case OPT_ast_list:
1117       Opts.ProgramAction = frontend::ASTDeclList; break;
1118     case OPT_ast_dump:
1119     case OPT_ast_dump_lookups:
1120       Opts.ProgramAction = frontend::ASTDump; break;
1121     case OPT_ast_print:
1122       Opts.ProgramAction = frontend::ASTPrint; break;
1123     case OPT_ast_view:
1124       Opts.ProgramAction = frontend::ASTView; break;
1125     case OPT_dump_raw_tokens:
1126       Opts.ProgramAction = frontend::DumpRawTokens; break;
1127     case OPT_dump_tokens:
1128       Opts.ProgramAction = frontend::DumpTokens; break;
1129     case OPT_S:
1130       Opts.ProgramAction = frontend::EmitAssembly; break;
1131     case OPT_emit_llvm_bc:
1132       Opts.ProgramAction = frontend::EmitBC; break;
1133     case OPT_emit_html:
1134       Opts.ProgramAction = frontend::EmitHTML; break;
1135     case OPT_emit_llvm:
1136       Opts.ProgramAction = frontend::EmitLLVM; break;
1137     case OPT_emit_llvm_only:
1138       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1139     case OPT_emit_codegen_only:
1140       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1141     case OPT_emit_obj:
1142       Opts.ProgramAction = frontend::EmitObj; break;
1143     case OPT_fixit_EQ:
1144       Opts.FixItSuffix = A->getValue();
1145       // fall-through!
1146     case OPT_fixit:
1147       Opts.ProgramAction = frontend::FixIt; break;
1148     case OPT_emit_module:
1149       Opts.ProgramAction = frontend::GenerateModule; break;
1150     case OPT_emit_module_interface:
1151       Opts.ProgramAction = frontend::GenerateModuleInterface; break;
1152     case OPT_emit_pch:
1153       Opts.ProgramAction = frontend::GeneratePCH; break;
1154     case OPT_emit_pth:
1155       Opts.ProgramAction = frontend::GeneratePTH; break;
1156     case OPT_init_only:
1157       Opts.ProgramAction = frontend::InitOnly; break;
1158     case OPT_fsyntax_only:
1159       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1160     case OPT_module_file_info:
1161       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1162     case OPT_verify_pch:
1163       Opts.ProgramAction = frontend::VerifyPCH; break;
1164     case OPT_print_decl_contexts:
1165       Opts.ProgramAction = frontend::PrintDeclContext; break;
1166     case OPT_print_preamble:
1167       Opts.ProgramAction = frontend::PrintPreamble; break;
1168     case OPT_E:
1169       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1170     case OPT_rewrite_macros:
1171       Opts.ProgramAction = frontend::RewriteMacros; break;
1172     case OPT_rewrite_objc:
1173       Opts.ProgramAction = frontend::RewriteObjC; break;
1174     case OPT_rewrite_test:
1175       Opts.ProgramAction = frontend::RewriteTest; break;
1176     case OPT_analyze:
1177       Opts.ProgramAction = frontend::RunAnalysis; break;
1178     case OPT_migrate:
1179       Opts.ProgramAction = frontend::MigrateSource; break;
1180     case OPT_Eonly:
1181       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1182     }
1183   }
1184 
1185   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1186     Opts.Plugins.emplace_back(A->getValue(0));
1187     Opts.ProgramAction = frontend::PluginAction;
1188     Opts.ActionName = A->getValue();
1189   }
1190   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1191   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1192     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1193 
1194   for (const std::string &Arg :
1195          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1196     std::string BlockName;
1197     unsigned MajorVersion;
1198     unsigned MinorVersion;
1199     bool Hashed;
1200     std::string UserInfo;
1201     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1202                                         MinorVersion, Hashed, UserInfo)) {
1203       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1204 
1205       continue;
1206     }
1207 
1208     // Add the testing module file extension.
1209     Opts.ModuleFileExtensions.push_back(
1210       new TestModuleFileExtension(BlockName, MajorVersion, MinorVersion,
1211                                   Hashed, UserInfo));
1212   }
1213 
1214   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1215     Opts.CodeCompletionAt =
1216       ParsedSourceLocation::FromString(A->getValue());
1217     if (Opts.CodeCompletionAt.FileName.empty())
1218       Diags.Report(diag::err_drv_invalid_value)
1219         << A->getAsString(Args) << A->getValue();
1220   }
1221   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1222 
1223   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1224   Opts.Plugins = Args.getAllArgValues(OPT_load);
1225   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1226   Opts.ShowHelp = Args.hasArg(OPT_help);
1227   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1228   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1229   Opts.ShowVersion = Args.hasArg(OPT_version);
1230   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1231   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1232   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1233   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1234   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1235   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1236   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1237   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1238   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1239   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1240   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1241   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1242   Opts.ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
1243   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1244   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1245   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
1246 
1247   Opts.CodeCompleteOpts.IncludeMacros
1248     = Args.hasArg(OPT_code_completion_macros);
1249   Opts.CodeCompleteOpts.IncludeCodePatterns
1250     = Args.hasArg(OPT_code_completion_patterns);
1251   Opts.CodeCompleteOpts.IncludeGlobals
1252     = !Args.hasArg(OPT_no_code_completion_globals);
1253   Opts.CodeCompleteOpts.IncludeBriefComments
1254     = Args.hasArg(OPT_code_completion_brief_comments);
1255 
1256   Opts.OverrideRecordLayoutsFile
1257     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1258   Opts.AuxTriple =
1259       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1260   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1261   Opts.StatsFile = Args.getLastArgValue(OPT_stats_file);
1262 
1263   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1264                                      OPT_arcmt_modify,
1265                                      OPT_arcmt_migrate)) {
1266     switch (A->getOption().getID()) {
1267     default:
1268       llvm_unreachable("missed a case");
1269     case OPT_arcmt_check:
1270       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1271       break;
1272     case OPT_arcmt_modify:
1273       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1274       break;
1275     case OPT_arcmt_migrate:
1276       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1277       break;
1278     }
1279   }
1280   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1281   Opts.ARCMTMigrateReportOut
1282     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1283   Opts.ARCMTMigrateEmitARCErrors
1284     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1285 
1286   if (Args.hasArg(OPT_objcmt_migrate_literals))
1287     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1288   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1289     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1290   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1291     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1292   if (Args.hasArg(OPT_objcmt_migrate_property))
1293     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1294   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1295     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1296   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1297     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1298   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1299     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1300   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1301     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1302   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1303     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1304   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1305     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1306   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1307     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1308   if (Args.hasArg(OPT_objcmt_atomic_property))
1309     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1310   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1311     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1312   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1313     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1314   if (Args.hasArg(OPT_objcmt_migrate_all))
1315     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1316 
1317   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1318 
1319   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1320       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1321     Diags.Report(diag::err_drv_argument_not_allowed_with)
1322       << "ARC migration" << "ObjC migration";
1323   }
1324 
1325   InputKind DashX = IK_None;
1326   if (const Arg *A = Args.getLastArg(OPT_x)) {
1327     DashX = llvm::StringSwitch<InputKind>(A->getValue())
1328       .Case("c", IK_C)
1329       .Case("cl", IK_OpenCL)
1330       .Case("cuda", IK_CUDA)
1331       .Case("c++", IK_CXX)
1332       .Case("c++-module", IK_CXX)
1333       .Case("objective-c", IK_ObjC)
1334       .Case("objective-c++", IK_ObjCXX)
1335       .Case("cpp-output", IK_PreprocessedC)
1336       .Case("assembler-with-cpp", IK_Asm)
1337       .Case("c++-cpp-output", IK_PreprocessedCXX)
1338       .Case("c++-module-cpp-output", IK_PreprocessedCXX)
1339       .Case("cuda-cpp-output", IK_PreprocessedCuda)
1340       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
1341       .Case("objc-cpp-output", IK_PreprocessedObjC)
1342       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
1343       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
1344       .Case("c-header", IK_C)
1345       .Case("cl-header", IK_OpenCL)
1346       .Case("objective-c-header", IK_ObjC)
1347       .Case("c++-header", IK_CXX)
1348       .Case("objective-c++-header", IK_ObjCXX)
1349       .Cases("ast", "pcm", IK_AST)
1350       .Case("ir", IK_LLVM_IR)
1351       .Case("renderscript", IK_RenderScript)
1352       .Default(IK_None);
1353     if (DashX == IK_None)
1354       Diags.Report(diag::err_drv_invalid_value)
1355         << A->getAsString(Args) << A->getValue();
1356     IsHeaderFile = llvm::StringSwitch<bool>(A->getValue())
1357       .Case("c-header", true)
1358       .Case("cl-header", true)
1359       .Case("objective-c-header", true)
1360       .Case("c++-header", true)
1361       .Case("objective-c++-header", true)
1362       .Default(false);
1363   }
1364 
1365   // '-' is the default input if none is given.
1366   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1367   Opts.Inputs.clear();
1368   if (Inputs.empty())
1369     Inputs.push_back("-");
1370   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1371     InputKind IK = DashX;
1372     if (IK == IK_None) {
1373       IK = FrontendOptions::getInputKindForExtension(
1374         StringRef(Inputs[i]).rsplit('.').second);
1375       // FIXME: Remove this hack.
1376       if (i == 0)
1377         DashX = IK;
1378     }
1379     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1380   }
1381 
1382   return DashX;
1383 }
1384 
1385 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1386                                                  void *MainAddr) {
1387   std::string ClangExecutable =
1388       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1389   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1390 
1391   // Compute the path to the resource directory.
1392   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1393   SmallString<128> P(Dir);
1394   if (ClangResourceDir != "")
1395     llvm::sys::path::append(P, ClangResourceDir);
1396   else
1397     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1398                             "clang", CLANG_VERSION_STRING);
1399 
1400   return P.str();
1401 }
1402 
1403 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
1404   using namespace options;
1405   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1406   Opts.Verbose = Args.hasArg(OPT_v);
1407   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1408   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1409   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1410   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1411     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1412   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1413   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
1414   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1415   for (const Arg *A : Args.filtered(OPT_fprebuilt_module_path))
1416     Opts.AddPrebuiltModulePath(A->getValue());
1417   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1418   Opts.ModulesValidateDiagnosticOptions =
1419       !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
1420   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1421   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1422   Opts.ModuleCachePruneInterval =
1423       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1424   Opts.ModuleCachePruneAfter =
1425       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1426   Opts.ModulesValidateOncePerBuildSession =
1427       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1428   Opts.BuildSessionTimestamp =
1429       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1430   Opts.ModulesValidateSystemHeaders =
1431       Args.hasArg(OPT_fmodules_validate_system_headers);
1432   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1433     Opts.ModuleFormat = A->getValue();
1434 
1435   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1436     StringRef MacroDef = A->getValue();
1437     Opts.ModulesIgnoreMacros.insert(
1438         llvm::CachedHashString(MacroDef.split('=').first));
1439   }
1440 
1441   // Add -I..., -F..., and -index-header-map options in order.
1442   bool IsIndexHeaderMap = false;
1443   bool IsSysrootSpecified =
1444       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1445   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1446     if (A->getOption().matches(OPT_index_header_map)) {
1447       // -index-header-map applies to the next -I or -F.
1448       IsIndexHeaderMap = true;
1449       continue;
1450     }
1451 
1452     frontend::IncludeDirGroup Group =
1453         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1454 
1455     bool IsFramework = A->getOption().matches(OPT_F);
1456     std::string Path = A->getValue();
1457 
1458     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1459       SmallString<32> Buffer;
1460       llvm::sys::path::append(Buffer, Opts.Sysroot,
1461                               llvm::StringRef(A->getValue()).substr(1));
1462       Path = Buffer.str();
1463     }
1464 
1465     Opts.AddPath(Path, Group, IsFramework,
1466                  /*IgnoreSysroot*/ true);
1467     IsIndexHeaderMap = false;
1468   }
1469 
1470   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1471   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1472   for (const Arg *A :
1473        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1474     if (A->getOption().matches(OPT_iprefix))
1475       Prefix = A->getValue();
1476     else if (A->getOption().matches(OPT_iwithprefix))
1477       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1478     else
1479       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1480   }
1481 
1482   for (const Arg *A : Args.filtered(OPT_idirafter))
1483     Opts.AddPath(A->getValue(), frontend::After, false, true);
1484   for (const Arg *A : Args.filtered(OPT_iquote))
1485     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1486   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1487     Opts.AddPath(A->getValue(), frontend::System, false,
1488                  !A->getOption().matches(OPT_iwithsysroot));
1489   for (const Arg *A : Args.filtered(OPT_iframework))
1490     Opts.AddPath(A->getValue(), frontend::System, true, true);
1491 
1492   // Add the paths for the various language specific isystem flags.
1493   for (const Arg *A : Args.filtered(OPT_c_isystem))
1494     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1495   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1496     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1497   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1498     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1499   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1500     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1501 
1502   // Add the internal paths from a driver that detects standard include paths.
1503   for (const Arg *A :
1504        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1505     frontend::IncludeDirGroup Group = frontend::System;
1506     if (A->getOption().matches(OPT_internal_externc_isystem))
1507       Group = frontend::ExternCSystem;
1508     Opts.AddPath(A->getValue(), Group, false, true);
1509   }
1510 
1511   // Add the path prefixes which are implicitly treated as being system headers.
1512   for (const Arg *A :
1513        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1514     Opts.AddSystemHeaderPrefix(
1515         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1516 
1517   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1518     Opts.AddVFSOverlayFile(A->getValue());
1519 }
1520 
1521 static bool isOpenCL(LangStandard::Kind LangStd) {
1522   return LangStd == LangStandard::lang_opencl ||
1523          LangStd == LangStandard::lang_opencl11 ||
1524          LangStd == LangStandard::lang_opencl12 ||
1525          LangStd == LangStandard::lang_opencl20;
1526 }
1527 
1528 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1529                                          const llvm::Triple &T,
1530                                          PreprocessorOptions &PPOpts,
1531                                          LangStandard::Kind LangStd) {
1532   // Set some properties which depend solely on the input kind; it would be nice
1533   // to move these to the language standard, and have the driver resolve the
1534   // input kind + language standard.
1535   if (IK == IK_Asm) {
1536     Opts.AsmPreprocessor = 1;
1537   } else if (IK == IK_ObjC ||
1538              IK == IK_ObjCXX ||
1539              IK == IK_PreprocessedObjC ||
1540              IK == IK_PreprocessedObjCXX) {
1541     Opts.ObjC1 = Opts.ObjC2 = 1;
1542   }
1543 
1544   if (LangStd == LangStandard::lang_unspecified) {
1545     // Based on the base language, pick one.
1546     switch (IK) {
1547     case IK_None:
1548     case IK_AST:
1549     case IK_LLVM_IR:
1550       llvm_unreachable("Invalid input kind!");
1551     case IK_OpenCL:
1552       LangStd = LangStandard::lang_opencl;
1553       break;
1554     case IK_CUDA:
1555     case IK_PreprocessedCuda:
1556       LangStd = LangStandard::lang_cuda;
1557       break;
1558     case IK_Asm:
1559     case IK_C:
1560     case IK_PreprocessedC:
1561     case IK_ObjC:
1562     case IK_PreprocessedObjC:
1563       // The PS4 uses C99 as the default C standard.
1564       if (T.isPS4())
1565         LangStd = LangStandard::lang_gnu99;
1566       else
1567         LangStd = LangStandard::lang_gnu11;
1568       break;
1569     case IK_CXX:
1570     case IK_PreprocessedCXX:
1571     case IK_ObjCXX:
1572     case IK_PreprocessedObjCXX:
1573       LangStd = LangStandard::lang_gnucxx98;
1574       break;
1575     case IK_RenderScript:
1576       LangStd = LangStandard::lang_c99;
1577       break;
1578     }
1579   }
1580 
1581   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1582   Opts.LineComment = Std.hasLineComments();
1583   Opts.C99 = Std.isC99();
1584   Opts.C11 = Std.isC11();
1585   Opts.CPlusPlus = Std.isCPlusPlus();
1586   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1587   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1588   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1589   Opts.Digraphs = Std.hasDigraphs();
1590   Opts.GNUMode = Std.isGNUMode();
1591   Opts.GNUInline = Std.isC89();
1592   Opts.HexFloats = Std.hasHexFloats();
1593   Opts.ImplicitInt = Std.hasImplicitInt();
1594 
1595   // Set OpenCL Version.
1596   Opts.OpenCL = isOpenCL(LangStd) || IK == IK_OpenCL;
1597   if (LangStd == LangStandard::lang_opencl)
1598     Opts.OpenCLVersion = 100;
1599   else if (LangStd == LangStandard::lang_opencl11)
1600     Opts.OpenCLVersion = 110;
1601   else if (LangStd == LangStandard::lang_opencl12)
1602     Opts.OpenCLVersion = 120;
1603   else if (LangStd == LangStandard::lang_opencl20)
1604     Opts.OpenCLVersion = 200;
1605 
1606   // OpenCL has some additional defaults.
1607   if (Opts.OpenCL) {
1608     Opts.AltiVec = 0;
1609     Opts.ZVector = 0;
1610     Opts.CXXOperatorNames = 1;
1611     Opts.LaxVectorConversions = 0;
1612     Opts.DefaultFPContract = 1;
1613     Opts.NativeHalfType = 1;
1614     Opts.NativeHalfArgsAndReturns = 1;
1615     // Include default header file for OpenCL.
1616     if (Opts.IncludeDefaultHeader) {
1617       PPOpts.Includes.push_back("opencl-c.h");
1618     }
1619   }
1620 
1621   Opts.CUDA = IK == IK_CUDA || IK == IK_PreprocessedCuda ||
1622               LangStd == LangStandard::lang_cuda;
1623 
1624   Opts.RenderScript = IK == IK_RenderScript;
1625   if (Opts.RenderScript) {
1626     Opts.NativeHalfType = 1;
1627     Opts.NativeHalfArgsAndReturns = 1;
1628   }
1629 
1630   // OpenCL and C++ both have bool, true, false keywords.
1631   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1632 
1633   // OpenCL has half keyword
1634   Opts.Half = Opts.OpenCL;
1635 
1636   // C++ has wchar_t keyword.
1637   Opts.WChar = Opts.CPlusPlus;
1638 
1639   Opts.GNUKeywords = Opts.GNUMode;
1640   Opts.CXXOperatorNames = Opts.CPlusPlus;
1641 
1642   Opts.AlignedAllocation = Opts.CPlusPlus1z;
1643 
1644   Opts.DollarIdents = !Opts.AsmPreprocessor;
1645 }
1646 
1647 /// Attempt to parse a visibility value out of the given argument.
1648 static Visibility parseVisibility(Arg *arg, ArgList &args,
1649                                   DiagnosticsEngine &diags) {
1650   StringRef value = arg->getValue();
1651   if (value == "default") {
1652     return DefaultVisibility;
1653   } else if (value == "hidden" || value == "internal") {
1654     return HiddenVisibility;
1655   } else if (value == "protected") {
1656     // FIXME: diagnose if target does not support protected visibility
1657     return ProtectedVisibility;
1658   }
1659 
1660   diags.Report(diag::err_drv_invalid_value)
1661     << arg->getAsString(args) << value;
1662   return DefaultVisibility;
1663 }
1664 
1665 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1666                           const TargetOptions &TargetOpts,
1667                           PreprocessorOptions &PPOpts,
1668                           DiagnosticsEngine &Diags) {
1669   // FIXME: Cleanup per-file based stuff.
1670   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1671   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1672     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1673 #define LANGSTANDARD(id, name, desc, features) \
1674       .Case(name, LangStandard::lang_##id)
1675 #define LANGSTANDARD_ALIAS(id, alias) \
1676       .Case(alias, LangStandard::lang_##id)
1677 #include "clang/Frontend/LangStandards.def"
1678       .Default(LangStandard::lang_unspecified);
1679     if (LangStd == LangStandard::lang_unspecified)
1680       Diags.Report(diag::err_drv_invalid_value)
1681         << A->getAsString(Args) << A->getValue();
1682     else {
1683       // Valid standard, check to make sure language and standard are
1684       // compatible.
1685       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1686       switch (IK) {
1687       case IK_C:
1688       case IK_ObjC:
1689       case IK_PreprocessedC:
1690       case IK_PreprocessedObjC:
1691         if (!(Std.isC89() || Std.isC99()))
1692           Diags.Report(diag::err_drv_argument_not_allowed_with)
1693             << A->getAsString(Args) << "C/ObjC";
1694         break;
1695       case IK_CXX:
1696       case IK_ObjCXX:
1697       case IK_PreprocessedCXX:
1698       case IK_PreprocessedObjCXX:
1699         if (!Std.isCPlusPlus())
1700           Diags.Report(diag::err_drv_argument_not_allowed_with)
1701             << A->getAsString(Args) << "C++/ObjC++";
1702         break;
1703       case IK_OpenCL:
1704         if (!isOpenCL(LangStd))
1705           Diags.Report(diag::err_drv_argument_not_allowed_with)
1706             << A->getAsString(Args) << "OpenCL";
1707         break;
1708       case IK_CUDA:
1709       case IK_PreprocessedCuda:
1710         if (!Std.isCPlusPlus())
1711           Diags.Report(diag::err_drv_argument_not_allowed_with)
1712             << A->getAsString(Args) << "CUDA";
1713         break;
1714       default:
1715         break;
1716       }
1717     }
1718   }
1719 
1720   // -cl-std only applies for OpenCL language standards.
1721   // Override the -std option in this case.
1722   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1723     LangStandard::Kind OpenCLLangStd
1724     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1725     .Cases("cl", "CL", LangStandard::lang_opencl)
1726     .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
1727     .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
1728     .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
1729     .Default(LangStandard::lang_unspecified);
1730 
1731     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1732       Diags.Report(diag::err_drv_invalid_value)
1733       << A->getAsString(Args) << A->getValue();
1734     }
1735     else
1736       LangStd = OpenCLLangStd;
1737   }
1738 
1739   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
1740 
1741   llvm::Triple T(TargetOpts.Triple);
1742   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
1743 
1744   // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
1745   // This option should be deprecated for CL > 1.0 because
1746   // this option was added for compatibility with OpenCL 1.0.
1747   if (Args.getLastArg(OPT_cl_strict_aliasing)
1748        && Opts.OpenCLVersion > 100) {
1749     std::string VerSpec = llvm::to_string(Opts.OpenCLVersion / 100) +
1750                           std::string(".") +
1751                           llvm::to_string((Opts.OpenCLVersion % 100) / 10);
1752     Diags.Report(diag::warn_option_invalid_ocl_version)
1753       << VerSpec << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
1754   }
1755 
1756   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1757   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1758   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1759   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1760   // name, as it doesn't seem a useful distinction.
1761   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1762                                   Opts.GNUKeywords);
1763 
1764   if (Args.hasArg(OPT_fno_operator_names))
1765     Opts.CXXOperatorNames = 0;
1766 
1767   if (Args.hasArg(OPT_fcuda_is_device))
1768     Opts.CUDAIsDevice = 1;
1769 
1770   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1771     Opts.CUDAAllowVariadicFunctions = 1;
1772 
1773   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1774     Opts.CUDAHostDeviceConstexpr = 0;
1775 
1776   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1777     Opts.CUDADeviceFlushDenormalsToZero = 1;
1778 
1779   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1780     Opts.CUDADeviceApproxTranscendentals = 1;
1781 
1782   if (Opts.ObjC1) {
1783     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1784       StringRef value = arg->getValue();
1785       if (Opts.ObjCRuntime.tryParse(value))
1786         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1787     }
1788 
1789     if (Args.hasArg(OPT_fobjc_gc_only))
1790       Opts.setGC(LangOptions::GCOnly);
1791     else if (Args.hasArg(OPT_fobjc_gc))
1792       Opts.setGC(LangOptions::HybridGC);
1793     else if (Args.hasArg(OPT_fobjc_arc)) {
1794       Opts.ObjCAutoRefCount = 1;
1795       if (!Opts.ObjCRuntime.allowsARC())
1796         Diags.Report(diag::err_arc_unsupported_on_runtime);
1797     }
1798 
1799     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
1800     // whether the feature is actually enabled.  This is predominantly
1801     // determined by -fobjc-runtime, but we allow it to be overridden
1802     // from the command line for testing purposes.
1803     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1804       Opts.ObjCWeakRuntime = 1;
1805     else
1806       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
1807 
1808     // ObjCWeak determines whether __weak is actually enabled.
1809     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
1810     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
1811       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
1812         assert(!Opts.ObjCWeak);
1813       } else if (Opts.getGC() != LangOptions::NonGC) {
1814         Diags.Report(diag::err_objc_weak_with_gc);
1815       } else if (!Opts.ObjCWeakRuntime) {
1816         Diags.Report(diag::err_objc_weak_unsupported);
1817       } else {
1818         Opts.ObjCWeak = 1;
1819       }
1820     } else if (Opts.ObjCAutoRefCount) {
1821       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
1822     }
1823 
1824     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1825       Opts.ObjCInferRelatedResultType = 0;
1826 
1827     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1828       Opts.ObjCSubscriptingLegacyRuntime =
1829         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1830   }
1831 
1832   if (Args.hasArg(OPT_fgnu89_inline)) {
1833     if (Opts.CPlusPlus)
1834       Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fgnu89-inline"
1835                                                             << "C++/ObjC++";
1836     else
1837       Opts.GNUInline = 1;
1838   }
1839 
1840   if (Args.hasArg(OPT_fapple_kext)) {
1841     if (!Opts.CPlusPlus)
1842       Diags.Report(diag::warn_c_kext);
1843     else
1844       Opts.AppleKext = 1;
1845   }
1846 
1847   if (Args.hasArg(OPT_print_ivar_layout))
1848     Opts.ObjCGCBitmapPrint = 1;
1849   if (Args.hasArg(OPT_fno_constant_cfstrings))
1850     Opts.NoConstantCFStrings = 1;
1851 
1852   if (Args.hasArg(OPT_faltivec))
1853     Opts.AltiVec = 1;
1854 
1855   if (Args.hasArg(OPT_fzvector))
1856     Opts.ZVector = 1;
1857 
1858   if (Args.hasArg(OPT_pthread))
1859     Opts.POSIXThreads = 1;
1860 
1861   // The value-visibility mode defaults to "default".
1862   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1863     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1864   } else {
1865     Opts.setValueVisibilityMode(DefaultVisibility);
1866   }
1867 
1868   // The type-visibility mode defaults to the value-visibility mode.
1869   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1870     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1871   } else {
1872     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1873   }
1874 
1875   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1876     Opts.InlineVisibilityHidden = 1;
1877 
1878   if (Args.hasArg(OPT_ftrapv)) {
1879     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1880     // Set the handler, if one is specified.
1881     Opts.OverflowHandler =
1882         Args.getLastArgValue(OPT_ftrapv_handler);
1883   }
1884   else if (Args.hasArg(OPT_fwrapv))
1885     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1886 
1887   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1888   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1889   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1890   Opts.MSCompatibilityVersion = 0;
1891   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
1892     VersionTuple VT;
1893     if (VT.tryParse(A->getValue()))
1894       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
1895                                                 << A->getValue();
1896     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
1897                                   VT.getMinor().getValueOr(0) * 100000 +
1898                                   VT.getSubminor().getValueOr(0);
1899   }
1900 
1901   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1902   // is specified, or -std is set to a conforming mode.
1903   // Trigraphs are disabled by default in c++1z onwards.
1904   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
1905   Opts.Trigraphs =
1906       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
1907 
1908   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1909                                    OPT_fno_dollars_in_identifiers,
1910                                    Opts.DollarIdents);
1911   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1912   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1913   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1914   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1915   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1916                                    Opts.ConstStrings);
1917   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1918     Opts.LaxVectorConversions = 0;
1919   if (Args.hasArg(OPT_fno_threadsafe_statics))
1920     Opts.ThreadsafeStatics = 0;
1921   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1922   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1923   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1924   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1925   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
1926   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1927 
1928   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
1929   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
1930   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
1931     && Opts.OpenCLVersion >= 200);
1932   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1933   Opts.CoroutinesTS = Args.hasArg(OPT_fcoroutines_ts);
1934   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
1935   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
1936   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
1937   Opts.ModulesDeclUse =
1938       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
1939   Opts.ModulesLocalVisibility =
1940       Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS;
1941   Opts.ModulesSearchAll = Opts.Modules &&
1942     !Args.hasArg(OPT_fno_modules_search_all) &&
1943     Args.hasArg(OPT_fmodules_search_all);
1944   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
1945   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
1946   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1947   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1948   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1949   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1950   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1951   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1952   if (!Opts.NoBuiltin)
1953     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
1954   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1955   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1956   Opts.AlignedAllocation =
1957       Args.hasFlag(OPT_faligned_allocation, OPT_fno_aligned_allocation,
1958                    Opts.AlignedAllocation);
1959   Opts.NewAlignOverride =
1960       getLastArgIntValue(Args, OPT_fnew_alignment_EQ, 0, Diags);
1961   if (Opts.NewAlignOverride && !llvm::isPowerOf2_32(Opts.NewAlignOverride)) {
1962     Arg *A = Args.getLastArg(OPT_fnew_alignment_EQ);
1963     Diags.Report(diag::err_fe_invalid_alignment) << A->getAsString(Args)
1964                                                  << A->getValue();
1965     Opts.NewAlignOverride = 0;
1966   }
1967   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
1968   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1969   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1970   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1971   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1972   Opts.InstantiationDepth =
1973       getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
1974   Opts.ArrowDepth =
1975       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1976   Opts.ConstexprCallDepth =
1977       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1978   Opts.ConstexprStepLimit =
1979       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1980   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1981   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1982   Opts.NumLargeByValueCopy =
1983       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1984   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1985   Opts.ObjCConstantStringClass =
1986     Args.getLastArgValue(OPT_fconstant_string_class);
1987   Opts.ObjCDefaultSynthProperties =
1988     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1989   Opts.EncodeExtendedBlockSig =
1990     Args.hasArg(OPT_fencode_extended_block_signature);
1991   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1992   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1993   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
1994   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
1995   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1996   Opts.PIE = Args.hasArg(OPT_pic_is_pie);
1997   Opts.Static = Args.hasArg(OPT_static_define);
1998   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1999   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
2000                         || Args.hasArg(OPT_fdump_record_layouts);
2001   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
2002   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
2003   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
2004   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
2005   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
2006   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
2007   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
2008   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
2009   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
2010   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
2011   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
2012   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
2013   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
2014   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
2015   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
2016   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
2017   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
2018   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
2019   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
2020   // is enabled.
2021   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
2022                             | Opts.NativeHalfArgsAndReturns;
2023   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
2024 
2025   // __declspec is enabled by default for the PS4 by the driver, and also
2026   // enabled for Microsoft Extensions or Borland Extensions, here.
2027   //
2028   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
2029   // CUDA extension. However, it is required for supporting
2030   // __clang_cuda_builtin_vars.h, which uses __declspec(property). Once that has
2031   // been rewritten in terms of something more generic, remove the Opts.CUDA
2032   // term here.
2033   Opts.DeclSpecKeyword =
2034       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
2035                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
2036 
2037   // For now, we only support local submodule visibility in C++ (because we
2038   // heavily depend on the ODR for merging redefinitions).
2039   if (Opts.ModulesLocalVisibility && !Opts.CPlusPlus)
2040     Diags.Report(diag::err_drv_argument_not_allowed_with)
2041         << "-fmodules-local-submodule-visibility" << "C";
2042 
2043   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
2044     switch (llvm::StringSwitch<unsigned>(A->getValue())
2045       .Case("target", LangOptions::ASMM_Target)
2046       .Case("no", LangOptions::ASMM_Off)
2047       .Case("yes", LangOptions::ASMM_On)
2048       .Default(255)) {
2049     default:
2050       Diags.Report(diag::err_drv_invalid_value)
2051         << "-faddress-space-map-mangling=" << A->getValue();
2052       break;
2053     case LangOptions::ASMM_Target:
2054       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
2055       break;
2056     case LangOptions::ASMM_On:
2057       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
2058       break;
2059     case LangOptions::ASMM_Off:
2060       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
2061       break;
2062     }
2063   }
2064 
2065   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
2066     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
2067         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
2068             A->getValue())
2069             .Case("single",
2070                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
2071             .Case("multiple",
2072                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
2073             .Case("virtual",
2074                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
2075             .Default(LangOptions::PPTMK_BestCase);
2076     if (InheritanceModel == LangOptions::PPTMK_BestCase)
2077       Diags.Report(diag::err_drv_invalid_value)
2078           << "-fms-memptr-rep=" << A->getValue();
2079 
2080     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
2081   }
2082 
2083   // Check for MS default calling conventions being specified.
2084   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
2085     LangOptions::DefaultCallingConvention DefaultCC =
2086         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
2087             A->getValue())
2088             .Case("cdecl", LangOptions::DCC_CDecl)
2089             .Case("fastcall", LangOptions::DCC_FastCall)
2090             .Case("stdcall", LangOptions::DCC_StdCall)
2091             .Case("vectorcall", LangOptions::DCC_VectorCall)
2092             .Default(LangOptions::DCC_None);
2093     if (DefaultCC == LangOptions::DCC_None)
2094       Diags.Report(diag::err_drv_invalid_value)
2095           << "-fdefault-calling-conv=" << A->getValue();
2096 
2097     llvm::Triple T(TargetOpts.Triple);
2098     llvm::Triple::ArchType Arch = T.getArch();
2099     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2100                   DefaultCC == LangOptions::DCC_StdCall) &&
2101                  Arch != llvm::Triple::x86;
2102     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
2103                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2104     if (emitError)
2105       Diags.Report(diag::err_drv_argument_not_allowed_with)
2106           << A->getSpelling() << T.getTriple();
2107     else
2108       Opts.setDefaultCallingConv(DefaultCC);
2109   }
2110 
2111   // -mrtd option
2112   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2113     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2114       Diags.Report(diag::err_drv_argument_not_allowed_with)
2115           << A->getSpelling() << "-fdefault-calling-conv";
2116     else {
2117       llvm::Triple T(TargetOpts.Triple);
2118       if (T.getArch() != llvm::Triple::x86)
2119         Diags.Report(diag::err_drv_argument_not_allowed_with)
2120             << A->getSpelling() << T.getTriple();
2121       else
2122         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2123     }
2124   }
2125 
2126   // Check if -fopenmp is specified.
2127   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2128   Opts.OpenMPUseTLS =
2129       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2130   Opts.OpenMPIsDevice =
2131       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2132 
2133   if (Opts.OpenMP) {
2134     int Version =
2135         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2136     if (Version != 0)
2137       Opts.OpenMP = Version;
2138     // Provide diagnostic when a given target is not expected to be an OpenMP
2139     // device or host.
2140     if (!Opts.OpenMPIsDevice) {
2141       switch (T.getArch()) {
2142       default:
2143         break;
2144       // Add unsupported host targets here:
2145       case llvm::Triple::nvptx:
2146       case llvm::Triple::nvptx64:
2147         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2148             << TargetOpts.Triple;
2149         break;
2150       }
2151     }
2152   }
2153 
2154   // Get the OpenMP target triples if any.
2155   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
2156 
2157     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2158       llvm::Triple TT(A->getValue(i));
2159 
2160       if (TT.getArch() == llvm::Triple::UnknownArch)
2161         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2162       else
2163         Opts.OMPTargetTriples.push_back(TT);
2164     }
2165   }
2166 
2167   // Get OpenMP host file path if any and report if a non existent file is
2168   // found
2169   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
2170     Opts.OMPHostIRFile = A->getValue();
2171     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2172       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2173           << Opts.OMPHostIRFile;
2174   }
2175 
2176   // Record whether the __DEPRECATED define was requested.
2177   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2178                                  OPT_fno_deprecated_macro,
2179                                  Opts.Deprecated);
2180 
2181   // FIXME: Eliminate this dependency.
2182   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2183        OptSize = getOptimizationLevelSize(Args);
2184   Opts.Optimize = Opt != 0;
2185   Opts.OptimizeSize = OptSize != 0;
2186 
2187   // This is the __NO_INLINE__ define, which just depends on things like the
2188   // optimization level and -fno-inline, not actually whether the backend has
2189   // inlining enabled.
2190   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
2191 
2192   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2193       Args.hasArg(OPT_cl_fast_relaxed_math);
2194   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2195       Args.hasArg(OPT_cl_finite_math_only) ||
2196       Args.hasArg(OPT_cl_fast_relaxed_math);
2197   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2198                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2199                       Args.hasArg(OPT_cl_fast_relaxed_math);
2200 
2201   Opts.RetainCommentsFromSystemHeaders =
2202       Args.hasArg(OPT_fretain_comments_from_system_headers);
2203 
2204   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2205   switch (SSP) {
2206   default:
2207     Diags.Report(diag::err_drv_invalid_value)
2208       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2209     break;
2210   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2211   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2212   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2213   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2214   }
2215 
2216   // Parse -fsanitize= arguments.
2217   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2218                       Diags, Opts.Sanitize);
2219   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2220   Opts.SanitizeAddressFieldPadding =
2221       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2222   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2223 }
2224 
2225 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2226                                   FileManager &FileMgr,
2227                                   DiagnosticsEngine &Diags) {
2228   using namespace options;
2229   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2230   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2231   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2232       Opts.TokenCache = A->getValue();
2233   else
2234     Opts.TokenCache = Opts.ImplicitPTHInclude;
2235   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2236   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2237   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2238 
2239   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2240   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2241     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2242 
2243   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2244     StringRef Value(A->getValue());
2245     size_t Comma = Value.find(',');
2246     unsigned Bytes = 0;
2247     unsigned EndOfLine = 0;
2248 
2249     if (Comma == StringRef::npos ||
2250         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2251         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2252       Diags.Report(diag::err_drv_preamble_format);
2253     else {
2254       Opts.PrecompiledPreambleBytes.first = Bytes;
2255       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2256     }
2257   }
2258 
2259   // Add macros from the command line.
2260   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2261     if (A->getOption().matches(OPT_D))
2262       Opts.addMacroDef(A->getValue());
2263     else
2264       Opts.addMacroUndef(A->getValue());
2265   }
2266 
2267   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2268 
2269   // Add the ordered list of -includes.
2270   for (const Arg *A : Args.filtered(OPT_include))
2271     Opts.Includes.emplace_back(A->getValue());
2272 
2273   for (const Arg *A : Args.filtered(OPT_chain_include))
2274     Opts.ChainedIncludes.emplace_back(A->getValue());
2275 
2276   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2277     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2278 
2279     if (Split.second.empty()) {
2280       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2281       continue;
2282     }
2283 
2284     Opts.addRemappedFile(Split.first, Split.second);
2285   }
2286 
2287   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2288     StringRef Name = A->getValue();
2289     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2290       .Case("libc++", ARCXX_libcxx)
2291       .Case("libstdc++", ARCXX_libstdcxx)
2292       .Case("none", ARCXX_nolib)
2293       .Default(~0U);
2294     if (Library == ~0U)
2295       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2296     else
2297       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2298   }
2299 }
2300 
2301 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2302                                         ArgList &Args,
2303                                         frontend::ActionKind Action) {
2304   using namespace options;
2305 
2306   switch (Action) {
2307   case frontend::ASTDeclList:
2308   case frontend::ASTDump:
2309   case frontend::ASTPrint:
2310   case frontend::ASTView:
2311   case frontend::EmitAssembly:
2312   case frontend::EmitBC:
2313   case frontend::EmitHTML:
2314   case frontend::EmitLLVM:
2315   case frontend::EmitLLVMOnly:
2316   case frontend::EmitCodeGenOnly:
2317   case frontend::EmitObj:
2318   case frontend::FixIt:
2319   case frontend::GenerateModule:
2320   case frontend::GenerateModuleInterface:
2321   case frontend::GeneratePCH:
2322   case frontend::GeneratePTH:
2323   case frontend::ParseSyntaxOnly:
2324   case frontend::ModuleFileInfo:
2325   case frontend::VerifyPCH:
2326   case frontend::PluginAction:
2327   case frontend::PrintDeclContext:
2328   case frontend::RewriteObjC:
2329   case frontend::RewriteTest:
2330   case frontend::RunAnalysis:
2331   case frontend::MigrateSource:
2332     Opts.ShowCPP = 0;
2333     break;
2334 
2335   case frontend::DumpRawTokens:
2336   case frontend::DumpTokens:
2337   case frontend::InitOnly:
2338   case frontend::PrintPreamble:
2339   case frontend::PrintPreprocessedInput:
2340   case frontend::RewriteMacros:
2341   case frontend::RunPreprocessorOnly:
2342     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2343     break;
2344   }
2345 
2346   Opts.ShowComments = Args.hasArg(OPT_C);
2347   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2348   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2349   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2350   Opts.ShowIncludeDirectives = Args.hasArg(OPT_dI);
2351   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2352   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2353 }
2354 
2355 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2356                             DiagnosticsEngine &Diags) {
2357   using namespace options;
2358   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2359   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2360     StringRef Value = A->getValue();
2361     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2362                                  .Case("default", llvm::EABI::Default)
2363                                  .Case("4", llvm::EABI::EABI4)
2364                                  .Case("5", llvm::EABI::EABI5)
2365                                  .Case("gnu", llvm::EABI::GNU)
2366                                  .Default(llvm::EABI::Unknown);
2367     if (EABIVersion == llvm::EABI::Unknown)
2368       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2369                                                 << Value;
2370     else
2371       Opts.EABIVersion = Value;
2372   }
2373   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2374   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2375   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2376   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2377   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2378   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2379   // Use the default target triple if unspecified.
2380   if (Opts.Triple.empty())
2381     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2382   Opts.OpenCLExtensionsAsWritten = Args.getAllArgValues(OPT_cl_ext_EQ);
2383 }
2384 
2385 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2386                                         const char *const *ArgBegin,
2387                                         const char *const *ArgEnd,
2388                                         DiagnosticsEngine &Diags) {
2389   bool Success = true;
2390 
2391   // Parse the arguments.
2392   std::unique_ptr<OptTable> Opts(createDriverOptTable());
2393   const unsigned IncludedFlagsBitmask = options::CC1Option;
2394   unsigned MissingArgIndex, MissingArgCount;
2395   InputArgList Args =
2396       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2397                       MissingArgCount, IncludedFlagsBitmask);
2398   LangOptions &LangOpts = *Res.getLangOpts();
2399 
2400   // Check for missing argument error.
2401   if (MissingArgCount) {
2402     Diags.Report(diag::err_drv_missing_argument)
2403         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2404     Success = false;
2405   }
2406 
2407   // Issue errors on unknown arguments.
2408   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2409     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2410     Success = false;
2411   }
2412 
2413   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2414   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2415   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2416   Success &=
2417       ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2418                           false /*DefaultDiagColor*/, false /*DefaultShowOpt*/);
2419   ParseCommentArgs(LangOpts.CommentOpts, Args);
2420   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2421   // FIXME: We shouldn't have to pass the DashX option around here
2422   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
2423                                       LangOpts.IsHeaderFile);
2424   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2425   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2426                               Res.getTargetOpts());
2427   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args);
2428   if (DashX == IK_AST || DashX == IK_LLVM_IR) {
2429     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2430     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2431     // what the input type is.
2432     if (Args.hasArg(OPT_fobjc_arc))
2433       LangOpts.ObjCAutoRefCount = 1;
2434     // PIClevel and PIELevel are needed during code generation and this should be
2435     // set regardless of the input type.
2436     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2437     LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
2438     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2439                         Diags, LangOpts.Sanitize);
2440   } else {
2441     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2442     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
2443       Res.getPreprocessorOpts(), Diags);
2444     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2445       LangOpts.ObjCExceptions = 1;
2446   }
2447 
2448   if (LangOpts.CUDA) {
2449     // During CUDA device-side compilation, the aux triple is the
2450     // triple used for host compilation.
2451     if (LangOpts.CUDAIsDevice)
2452       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2453 
2454     // Set default FP_CONTRACT to FAST.
2455     if (!Args.hasArg(OPT_ffp_contract))
2456       Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
2457   }
2458 
2459   // FIXME: Override value name discarding when asan or msan is used because the
2460   // backend passes depend on the name of the alloca in order to print out
2461   // names.
2462   Res.getCodeGenOpts().DiscardValueNames &=
2463       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2464       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2465 
2466   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2467   // PCH file and find the original header name. Remove the need to do that in
2468   // ParsePreprocessorArgs and remove the FileManager
2469   // parameters from the function and the "FileManager.h" #include.
2470   FileManager FileMgr(Res.getFileSystemOpts());
2471   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags);
2472   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2473                               Res.getFrontendOpts().ProgramAction);
2474 
2475   // Turn on -Wspir-compat for SPIR target.
2476   llvm::Triple T(Res.getTargetOpts().Triple);
2477   auto Arch = T.getArch();
2478   if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) {
2479     Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
2480   }
2481   return Success;
2482 }
2483 
2484 std::string CompilerInvocation::getModuleHash() const {
2485   // Note: For QoI reasons, the things we use as a hash here should all be
2486   // dumped via the -module-info flag.
2487   using llvm::hash_code;
2488   using llvm::hash_value;
2489   using llvm::hash_combine;
2490 
2491   // Start the signature with the compiler version.
2492   // FIXME: We'd rather use something more cryptographically sound than
2493   // CityHash, but this will do for now.
2494   hash_code code = hash_value(getClangFullRepositoryVersion());
2495 
2496   // Extend the signature with the language options
2497 #define LANGOPT(Name, Bits, Default, Description) \
2498    code = hash_combine(code, LangOpts->Name);
2499 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2500   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2501 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2502 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2503 #include "clang/Basic/LangOptions.def"
2504 
2505   for (StringRef Feature : LangOpts->ModuleFeatures)
2506     code = hash_combine(code, Feature);
2507 
2508   // Extend the signature with the target options.
2509   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2510                       TargetOpts->ABI);
2511   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2512     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2513 
2514   // Extend the signature with preprocessor options.
2515   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2516   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2517   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2518 
2519   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2520             I = getPreprocessorOpts().Macros.begin(),
2521          IEnd = getPreprocessorOpts().Macros.end();
2522        I != IEnd; ++I) {
2523     // If we're supposed to ignore this macro for the purposes of modules,
2524     // don't put it into the hash.
2525     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2526       // Check whether we're ignoring this macro.
2527       StringRef MacroDef = I->first;
2528       if (hsOpts.ModulesIgnoreMacros.count(
2529               llvm::CachedHashString(MacroDef.split('=').first)))
2530         continue;
2531     }
2532 
2533     code = hash_combine(code, I->first, I->second);
2534   }
2535 
2536   // Extend the signature with the sysroot and other header search options.
2537   code = hash_combine(code, hsOpts.Sysroot,
2538                       hsOpts.ModuleFormat,
2539                       hsOpts.UseDebugInfo,
2540                       hsOpts.UseBuiltinIncludes,
2541                       hsOpts.UseStandardSystemIncludes,
2542                       hsOpts.UseStandardCXXIncludes,
2543                       hsOpts.UseLibcxx,
2544                       hsOpts.ModulesValidateDiagnosticOptions);
2545   code = hash_combine(code, hsOpts.ResourceDir);
2546 
2547   // Extend the signature with the user build path.
2548   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2549 
2550   // Extend the signature with the module file extensions.
2551   const FrontendOptions &frontendOpts = getFrontendOpts();
2552   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2553     code = ext->hashExtension(code);
2554   }
2555 
2556   // Darwin-specific hack: if we have a sysroot, use the contents and
2557   // modification time of
2558   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
2559   // as part of the module hash.
2560   if (!hsOpts.Sysroot.empty()) {
2561     SmallString<128> systemVersionFile;
2562     systemVersionFile += hsOpts.Sysroot;
2563     llvm::sys::path::append(systemVersionFile, "System");
2564     llvm::sys::path::append(systemVersionFile, "Library");
2565     llvm::sys::path::append(systemVersionFile, "CoreServices");
2566     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
2567 
2568     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer =
2569         llvm::MemoryBuffer::getFile(systemVersionFile);
2570     if (buffer) {
2571       code = hash_combine(code, buffer.get()->getBuffer());
2572 
2573       struct stat statBuf;
2574       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
2575         code = hash_combine(code, statBuf.st_mtime);
2576     }
2577   }
2578 
2579   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2580 }
2581 
2582 namespace clang {
2583 
2584 template<typename IntTy>
2585 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2586                                     IntTy Default,
2587                                     DiagnosticsEngine *Diags) {
2588   IntTy Res = Default;
2589   if (Arg *A = Args.getLastArg(Id)) {
2590     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2591       if (Diags)
2592         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2593                                                        << A->getValue();
2594     }
2595   }
2596   return Res;
2597 }
2598 
2599 
2600 // Declared in clang/Frontend/Utils.h.
2601 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2602                        DiagnosticsEngine *Diags) {
2603   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2604 }
2605 
2606 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2607                                uint64_t Default,
2608                                DiagnosticsEngine *Diags) {
2609   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2610 }
2611 
2612 void BuryPointer(const void *Ptr) {
2613   // This function may be called only a small fixed amount of times per each
2614   // invocation, otherwise we do actually have a leak which we want to report.
2615   // If this function is called more than kGraveYardMaxSize times, the pointers
2616   // will not be properly buried and a leak detector will report a leak, which
2617   // is what we want in such case.
2618   static const size_t kGraveYardMaxSize = 16;
2619   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2620   static std::atomic<unsigned> GraveYardSize;
2621   unsigned Idx = GraveYardSize++;
2622   if (Idx >= kGraveYardMaxSize)
2623     return;
2624   GraveYard[Idx] = Ptr;
2625 }
2626 
2627 IntrusiveRefCntPtr<vfs::FileSystem>
2628 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2629                                 DiagnosticsEngine &Diags) {
2630   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2631     return vfs::getRealFileSystem();
2632 
2633   IntrusiveRefCntPtr<vfs::OverlayFileSystem>
2634     Overlay(new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
2635   // earlier vfs files are on the bottom
2636   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2637     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2638         llvm::MemoryBuffer::getFile(File);
2639     if (!Buffer) {
2640       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2641       return IntrusiveRefCntPtr<vfs::FileSystem>();
2642     }
2643 
2644     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2645         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2646     if (!FS.get()) {
2647       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2648       return IntrusiveRefCntPtr<vfs::FileSystem>();
2649     }
2650     Overlay->pushOverlay(FS);
2651   }
2652   return Overlay;
2653 }
2654 } // end namespace clang
2655