1 //===--- CompilerInvocation.cpp -------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/Frontend/CompilerInvocation.h"
11 #include "TestModuleFileExtension.h"
12 #include "clang/Basic/Builtins.h"
13 #include "clang/Basic/FileManager.h"
14 #include "clang/Basic/Version.h"
15 #include "clang/Config/config.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/Options.h"
18 #include "clang/Driver/Util.h"
19 #include "clang/Frontend/FrontendDiagnostic.h"
20 #include "clang/Frontend/LangStandard.h"
21 #include "clang/Frontend/Utils.h"
22 #include "clang/Lex/HeaderSearchOptions.h"
23 #include "clang/Lex/PreprocessorOptions.h"
24 #include "clang/Serialization/ASTReader.h"
25 #include "clang/Serialization/ModuleFileExtension.h"
26 #include "llvm/ADT/Hashing.h"
27 #include "llvm/ADT/STLExtras.h"
28 #include "llvm/ADT/SmallVector.h"
29 #include "llvm/ADT/StringExtras.h"
30 #include "llvm/ADT/StringSwitch.h"
31 #include "llvm/ADT/Triple.h"
32 #include "llvm/Linker/Linker.h"
33 #include "llvm/Option/Arg.h"
34 #include "llvm/Option/ArgList.h"
35 #include "llvm/Option/OptTable.h"
36 #include "llvm/Option/Option.h"
37 #include "llvm/ProfileData/InstrProfReader.h"
38 #include "llvm/Support/CodeGen.h"
39 #include "llvm/Support/ErrorHandling.h"
40 #include "llvm/Support/FileSystem.h"
41 #include "llvm/Support/Host.h"
42 #include "llvm/Support/Path.h"
43 #include "llvm/Support/Process.h"
44 #include "llvm/Target/TargetOptions.h"
45 #include "llvm/Support/ScopedPrinter.h"
46 #include <atomic>
47 #include <memory>
48 #include <sys/stat.h>
49 #include <system_error>
50 using namespace clang;
51 
52 //===----------------------------------------------------------------------===//
53 // Initialization.
54 //===----------------------------------------------------------------------===//
55 
56 CompilerInvocationBase::CompilerInvocationBase()
57   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
58     DiagnosticOpts(new DiagnosticOptions()),
59     HeaderSearchOpts(new HeaderSearchOptions()),
60     PreprocessorOpts(new PreprocessorOptions()) {}
61 
62 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
63   : RefCountedBase<CompilerInvocation>(),
64     LangOpts(new LangOptions(*X.getLangOpts())),
65     TargetOpts(new TargetOptions(X.getTargetOpts())),
66     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
67     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
68     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
69 
70 CompilerInvocationBase::~CompilerInvocationBase() {}
71 
72 //===----------------------------------------------------------------------===//
73 // Deserialization (from args)
74 //===----------------------------------------------------------------------===//
75 
76 using namespace clang::driver;
77 using namespace clang::driver::options;
78 using namespace llvm::opt;
79 
80 //
81 
82 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
83                                      DiagnosticsEngine &Diags) {
84   unsigned DefaultOpt = 0;
85   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
86     DefaultOpt = 2;
87 
88   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
89     if (A->getOption().matches(options::OPT_O0))
90       return 0;
91 
92     if (A->getOption().matches(options::OPT_Ofast))
93       return 3;
94 
95     assert (A->getOption().matches(options::OPT_O));
96 
97     StringRef S(A->getValue());
98     if (S == "s" || S == "z" || S.empty())
99       return 2;
100 
101     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
102   }
103 
104   return DefaultOpt;
105 }
106 
107 static unsigned getOptimizationLevelSize(ArgList &Args) {
108   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
109     if (A->getOption().matches(options::OPT_O)) {
110       switch (A->getValue()[0]) {
111       default:
112         return 0;
113       case 's':
114         return 1;
115       case 'z':
116         return 2;
117       }
118     }
119   }
120   return 0;
121 }
122 
123 static void addDiagnosticArgs(ArgList &Args, OptSpecifier Group,
124                               OptSpecifier GroupWithValue,
125                               std::vector<std::string> &Diagnostics) {
126   for (Arg *A : Args.filtered(Group)) {
127     if (A->getOption().getKind() == Option::FlagClass) {
128       // The argument is a pure flag (such as OPT_Wall or OPT_Wdeprecated). Add
129       // its name (minus the "W" or "R" at the beginning) to the warning list.
130       Diagnostics.push_back(A->getOption().getName().drop_front(1));
131     } else if (A->getOption().matches(GroupWithValue)) {
132       // This is -Wfoo= or -Rfoo=, where foo is the name of the diagnostic group.
133       Diagnostics.push_back(A->getOption().getName().drop_front(1).rtrim("=-"));
134     } else {
135       // Otherwise, add its value (for OPT_W_Joined and similar).
136       for (const char *Arg : A->getValues())
137         Diagnostics.emplace_back(Arg);
138     }
139   }
140 }
141 
142 static void getAllNoBuiltinFuncValues(ArgList &Args,
143                                       std::vector<std::string> &Funcs) {
144   SmallVector<const char *, 8> Values;
145   for (const auto &Arg : Args) {
146     const Option &O = Arg->getOption();
147     if (O.matches(options::OPT_fno_builtin_)) {
148       const char *FuncName = Arg->getValue();
149       if (Builtin::Context::isBuiltinFunc(FuncName))
150         Values.push_back(FuncName);
151     }
152   }
153   Funcs.insert(Funcs.end(), Values.begin(), Values.end());
154 }
155 
156 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
157                               DiagnosticsEngine &Diags) {
158   using namespace options;
159   bool Success = true;
160   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
161     StringRef Name = A->getValue();
162     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
163 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
164       .Case(CMDFLAG, NAME##Model)
165 #include "clang/StaticAnalyzer/Core/Analyses.def"
166       .Default(NumStores);
167     if (Value == NumStores) {
168       Diags.Report(diag::err_drv_invalid_value)
169         << A->getAsString(Args) << Name;
170       Success = false;
171     } else {
172       Opts.AnalysisStoreOpt = Value;
173     }
174   }
175 
176   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
177     StringRef Name = A->getValue();
178     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
179 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
180       .Case(CMDFLAG, NAME##Model)
181 #include "clang/StaticAnalyzer/Core/Analyses.def"
182       .Default(NumConstraints);
183     if (Value == NumConstraints) {
184       Diags.Report(diag::err_drv_invalid_value)
185         << A->getAsString(Args) << Name;
186       Success = false;
187     } else {
188       Opts.AnalysisConstraintsOpt = Value;
189     }
190   }
191 
192   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
193     StringRef Name = A->getValue();
194     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
195 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
196       .Case(CMDFLAG, PD_##NAME)
197 #include "clang/StaticAnalyzer/Core/Analyses.def"
198       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
199     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
200       Diags.Report(diag::err_drv_invalid_value)
201         << A->getAsString(Args) << Name;
202       Success = false;
203     } else {
204       Opts.AnalysisDiagOpt = Value;
205     }
206   }
207 
208   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
209     StringRef Name = A->getValue();
210     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
211 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
212       .Case(CMDFLAG, NAME)
213 #include "clang/StaticAnalyzer/Core/Analyses.def"
214       .Default(NumPurgeModes);
215     if (Value == NumPurgeModes) {
216       Diags.Report(diag::err_drv_invalid_value)
217         << A->getAsString(Args) << Name;
218       Success = false;
219     } else {
220       Opts.AnalysisPurgeOpt = Value;
221     }
222   }
223 
224   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
225     StringRef Name = A->getValue();
226     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
227 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
228       .Case(CMDFLAG, NAME)
229 #include "clang/StaticAnalyzer/Core/Analyses.def"
230       .Default(NumInliningModes);
231     if (Value == NumInliningModes) {
232       Diags.Report(diag::err_drv_invalid_value)
233         << A->getAsString(Args) << Name;
234       Success = false;
235     } else {
236       Opts.InliningMode = Value;
237     }
238   }
239 
240   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
241   Opts.ShowEnabledCheckerList = Args.hasArg(OPT_analyzer_list_enabled_checkers);
242   Opts.DisableAllChecks = Args.hasArg(OPT_analyzer_disable_all_checks);
243 
244   Opts.visualizeExplodedGraphWithGraphViz =
245     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
246   Opts.visualizeExplodedGraphWithUbiGraph =
247     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
248   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
249   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
250   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
251   Opts.AnalyzeNestedBlocks =
252     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
253   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
254   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
255   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
256   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
257   Opts.maxBlockVisitOnPath =
258       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
259   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
260   Opts.InlineMaxStackDepth =
261       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
262                          Opts.InlineMaxStackDepth, Diags);
263 
264   Opts.CheckersControlList.clear();
265   for (const Arg *A :
266        Args.filtered(OPT_analyzer_checker, OPT_analyzer_disable_checker)) {
267     A->claim();
268     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
269     // We can have a list of comma separated checker names, e.g:
270     // '-analyzer-checker=cocoa,unix'
271     StringRef checkerList = A->getValue();
272     SmallVector<StringRef, 4> checkers;
273     checkerList.split(checkers, ",");
274     for (StringRef checker : checkers)
275       Opts.CheckersControlList.emplace_back(checker, enable);
276   }
277 
278   // Go through the analyzer configuration options.
279   for (const Arg *A : Args.filtered(OPT_analyzer_config)) {
280     A->claim();
281     // We can have a list of comma separated config names, e.g:
282     // '-analyzer-config key1=val1,key2=val2'
283     StringRef configList = A->getValue();
284     SmallVector<StringRef, 4> configVals;
285     configList.split(configVals, ",");
286     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
287       StringRef key, val;
288       std::tie(key, val) = configVals[i].split("=");
289       if (val.empty()) {
290         Diags.Report(SourceLocation(),
291                      diag::err_analyzer_config_no_value) << configVals[i];
292         Success = false;
293         break;
294       }
295       if (val.find('=') != StringRef::npos) {
296         Diags.Report(SourceLocation(),
297                      diag::err_analyzer_config_multiple_values)
298           << configVals[i];
299         Success = false;
300         break;
301       }
302       Opts.Config[key] = val;
303     }
304   }
305 
306   return Success;
307 }
308 
309 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
310   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
311   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
312   return true;
313 }
314 
315 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
316   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
317   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
318 }
319 
320 static StringRef getCodeModel(ArgList &Args, DiagnosticsEngine &Diags) {
321   if (Arg *A = Args.getLastArg(OPT_mcode_model)) {
322     StringRef Value = A->getValue();
323     if (Value == "small" || Value == "kernel" || Value == "medium" ||
324         Value == "large")
325       return Value;
326     Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Value;
327   }
328   return "default";
329 }
330 
331 /// \brief Create a new Regex instance out of the string value in \p RpassArg.
332 /// It returns a pointer to the newly generated Regex instance.
333 static std::shared_ptr<llvm::Regex>
334 GenerateOptimizationRemarkRegex(DiagnosticsEngine &Diags, ArgList &Args,
335                                 Arg *RpassArg) {
336   StringRef Val = RpassArg->getValue();
337   std::string RegexError;
338   std::shared_ptr<llvm::Regex> Pattern = std::make_shared<llvm::Regex>(Val);
339   if (!Pattern->isValid(RegexError)) {
340     Diags.Report(diag::err_drv_optimization_remark_pattern)
341         << RegexError << RpassArg->getAsString(Args);
342     Pattern.reset();
343   }
344   return Pattern;
345 }
346 
347 static bool parseDiagnosticLevelMask(StringRef FlagName,
348                                      const std::vector<std::string> &Levels,
349                                      DiagnosticsEngine *Diags,
350                                      DiagnosticLevelMask &M) {
351   bool Success = true;
352   for (const auto &Level : Levels) {
353     DiagnosticLevelMask const PM =
354       llvm::StringSwitch<DiagnosticLevelMask>(Level)
355         .Case("note",    DiagnosticLevelMask::Note)
356         .Case("remark",  DiagnosticLevelMask::Remark)
357         .Case("warning", DiagnosticLevelMask::Warning)
358         .Case("error",   DiagnosticLevelMask::Error)
359         .Default(DiagnosticLevelMask::None);
360     if (PM == DiagnosticLevelMask::None) {
361       Success = false;
362       if (Diags)
363         Diags->Report(diag::err_drv_invalid_value) << FlagName << Level;
364     }
365     M = M | PM;
366   }
367   return Success;
368 }
369 
370 static void parseSanitizerKinds(StringRef FlagName,
371                                 const std::vector<std::string> &Sanitizers,
372                                 DiagnosticsEngine &Diags, SanitizerSet &S) {
373   for (const auto &Sanitizer : Sanitizers) {
374     SanitizerMask K = parseSanitizerValue(Sanitizer, /*AllowGroups=*/false);
375     if (K == 0)
376       Diags.Report(diag::err_drv_invalid_value) << FlagName << Sanitizer;
377     else
378       S.set(K, true);
379   }
380 }
381 
382 // Set the profile kind for fprofile-instrument.
383 static void setPGOInstrumentor(CodeGenOptions &Opts, ArgList &Args,
384                                DiagnosticsEngine &Diags) {
385   Arg *A = Args.getLastArg(OPT_fprofile_instrument_EQ);
386   if (A == nullptr)
387     return;
388   StringRef S = A->getValue();
389   unsigned I = llvm::StringSwitch<unsigned>(S)
390                    .Case("none", CodeGenOptions::ProfileNone)
391                    .Case("clang", CodeGenOptions::ProfileClangInstr)
392                    .Case("llvm", CodeGenOptions::ProfileIRInstr)
393                    .Default(~0U);
394   if (I == ~0U) {
395     Diags.Report(diag::err_drv_invalid_pgo_instrumentor) << A->getAsString(Args)
396                                                          << S;
397     return;
398   }
399   CodeGenOptions::ProfileInstrKind Instrumentor =
400       static_cast<CodeGenOptions::ProfileInstrKind>(I);
401   Opts.setProfileInstr(Instrumentor);
402 }
403 
404 // Set the profile kind using fprofile-instrument-use-path.
405 static void setPGOUseInstrumentor(CodeGenOptions &Opts,
406                                   const Twine &ProfileName) {
407   auto ReaderOrErr = llvm::IndexedInstrProfReader::create(ProfileName);
408   // In error, return silently and let Clang PGOUse report the error message.
409   if (auto E = ReaderOrErr.takeError()) {
410     llvm::consumeError(std::move(E));
411     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
412     return;
413   }
414   std::unique_ptr<llvm::IndexedInstrProfReader> PGOReader =
415     std::move(ReaderOrErr.get());
416   if (PGOReader->isIRLevelProfile())
417     Opts.setProfileUse(CodeGenOptions::ProfileIRInstr);
418   else
419     Opts.setProfileUse(CodeGenOptions::ProfileClangInstr);
420 }
421 
422 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
423                              DiagnosticsEngine &Diags,
424                              const TargetOptions &TargetOpts) {
425   using namespace options;
426   bool Success = true;
427   llvm::Triple Triple = llvm::Triple(TargetOpts.Triple);
428 
429   unsigned OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
430   // TODO: This could be done in Driver
431   unsigned MaxOptLevel = 3;
432   if (OptimizationLevel > MaxOptLevel) {
433     // If the optimization level is not supported, fall back on the default
434     // optimization
435     Diags.Report(diag::warn_drv_optimization_value)
436         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
437     OptimizationLevel = MaxOptLevel;
438   }
439   Opts.OptimizationLevel = OptimizationLevel;
440 
441   // We must always run at least the always inlining pass.
442   Opts.setInlining(
443     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
444                                  : CodeGenOptions::OnlyAlwaysInlining);
445   // -fno-inline-functions overrides OptimizationLevel > 1.
446   Opts.NoInline = Args.hasArg(OPT_fno_inline);
447   if (Arg* InlineArg = Args.getLastArg(options::OPT_finline_functions,
448                                        options::OPT_finline_hint_functions,
449                                        options::OPT_fno_inline_functions)) {
450     const Option& InlineOpt = InlineArg->getOption();
451     if (InlineOpt.matches(options::OPT_finline_functions))
452       Opts.setInlining(CodeGenOptions::NormalInlining);
453     else if (InlineOpt.matches(options::OPT_finline_hint_functions))
454       Opts.setInlining(CodeGenOptions::OnlyHintInlining);
455     else
456       Opts.setInlining(CodeGenOptions::OnlyAlwaysInlining);
457   }
458 
459   if (Arg *A = Args.getLastArg(OPT_fveclib)) {
460     StringRef Name = A->getValue();
461     if (Name == "Accelerate")
462       Opts.setVecLib(CodeGenOptions::Accelerate);
463     else if (Name == "SVML")
464       Opts.setVecLib(CodeGenOptions::SVML);
465     else if (Name == "none")
466       Opts.setVecLib(CodeGenOptions::NoLibrary);
467     else
468       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
469   }
470 
471   if (Arg *A = Args.getLastArg(OPT_debug_info_kind_EQ)) {
472     unsigned Val =
473         llvm::StringSwitch<unsigned>(A->getValue())
474             .Case("line-tables-only", codegenoptions::DebugLineTablesOnly)
475             .Case("limited", codegenoptions::LimitedDebugInfo)
476             .Case("standalone", codegenoptions::FullDebugInfo)
477             .Default(~0U);
478     if (Val == ~0U)
479       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
480                                                 << A->getValue();
481     else
482       Opts.setDebugInfo(static_cast<codegenoptions::DebugInfoKind>(Val));
483   }
484   if (Arg *A = Args.getLastArg(OPT_debugger_tuning_EQ)) {
485     unsigned Val = llvm::StringSwitch<unsigned>(A->getValue())
486                        .Case("gdb", unsigned(llvm::DebuggerKind::GDB))
487                        .Case("lldb", unsigned(llvm::DebuggerKind::LLDB))
488                        .Case("sce", unsigned(llvm::DebuggerKind::SCE))
489                        .Default(~0U);
490     if (Val == ~0U)
491       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
492                                                 << A->getValue();
493     else
494       Opts.setDebuggerTuning(static_cast<llvm::DebuggerKind>(Val));
495   }
496   Opts.DwarfVersion = getLastArgIntValue(Args, OPT_dwarf_version_EQ, 0, Diags);
497   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
498   Opts.EmitCodeView = Args.hasArg(OPT_gcodeview);
499   Opts.WholeProgramVTables = Args.hasArg(OPT_fwhole_program_vtables);
500   Opts.LTOVisibilityPublicStd = Args.hasArg(OPT_flto_visibility_public_std);
501   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
502   Opts.SplitDwarfInlining = !Args.hasArg(OPT_fno_split_dwarf_inlining);
503   Opts.DebugTypeExtRefs = Args.hasArg(OPT_dwarf_ext_refs);
504   Opts.DebugExplicitImport = Triple.isPS4CPU();
505 
506   for (const auto &Arg : Args.getAllArgValues(OPT_fdebug_prefix_map_EQ))
507     Opts.DebugPrefixMap.insert(StringRef(Arg).split('='));
508 
509   if (const Arg *A =
510           Args.getLastArg(OPT_emit_llvm_uselists, OPT_no_emit_llvm_uselists))
511     Opts.EmitLLVMUseLists = A->getOption().getID() == OPT_emit_llvm_uselists;
512 
513   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
514   Opts.DisableLLVMPasses = Args.hasArg(OPT_disable_llvm_passes);
515   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
516   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
517   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
518     OPT_fuse_register_sized_bitfield_access);
519   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
520   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
521   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
522   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
523   Opts.NoCommon = Args.hasArg(OPT_fno_common);
524   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
525   Opts.OptimizeSize = getOptimizationLevelSize(Args);
526   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
527                             Args.hasArg(OPT_ffreestanding));
528   if (Opts.SimplifyLibCalls)
529     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
530   Opts.UnrollLoops =
531       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
532                    (Opts.OptimizationLevel > 1));
533   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
534 
535   Opts.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
536   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
537   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
538 
539   setPGOInstrumentor(Opts, Args, Diags);
540   Opts.InstrProfileOutput =
541       Args.getLastArgValue(OPT_fprofile_instrument_path_EQ);
542   Opts.ProfileInstrumentUsePath =
543       Args.getLastArgValue(OPT_fprofile_instrument_use_path_EQ);
544   if (!Opts.ProfileInstrumentUsePath.empty())
545     setPGOUseInstrumentor(Opts, Opts.ProfileInstrumentUsePath);
546 
547   Opts.CoverageMapping =
548       Args.hasFlag(OPT_fcoverage_mapping, OPT_fno_coverage_mapping, false);
549   Opts.DumpCoverageMapping = Args.hasArg(OPT_dump_coverage_mapping);
550   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
551   Opts.PreserveAsmComments = !Args.hasArg(OPT_fno_preserve_as_comments);
552   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
553   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
554   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
555   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
556   Opts.CodeModel = getCodeModel(Args, Diags);
557   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
558   Opts.DisableFPElim =
559       (Args.hasArg(OPT_mdisable_fp_elim) || Args.hasArg(OPT_pg));
560   Opts.DisableFree = Args.hasArg(OPT_disable_free);
561   Opts.DiscardValueNames = Args.hasArg(OPT_discard_value_names);
562   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
563   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
564   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
565   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
566   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
567                        Args.hasArg(OPT_cl_finite_math_only) ||
568                        Args.hasArg(OPT_cl_fast_relaxed_math));
569   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
570                        Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
571                        Args.hasArg(OPT_cl_finite_math_only) ||
572                        Args.hasArg(OPT_cl_fast_relaxed_math));
573   Opts.NoSignedZeros = (Args.hasArg(OPT_fno_signed_zeros) ||
574                         Args.hasArg(OPT_cl_no_signed_zeros));
575   Opts.FlushDenorm = Args.hasArg(OPT_cl_denorms_are_zero);
576   Opts.CorrectlyRoundedDivSqrt =
577       Args.hasArg(OPT_cl_fp32_correctly_rounded_divide_sqrt);
578   Opts.ReciprocalMath = Args.hasArg(OPT_freciprocal_math);
579   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
580   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
581   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
582   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
583   Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
584   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
585   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
586   Opts.IncrementalLinkerCompatible =
587       Args.hasArg(OPT_mincremental_linker_compatible);
588   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
589   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
590   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
591   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
592   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
593   Opts.StrictVTablePointers = Args.hasArg(OPT_fstrict_vtable_pointers);
594   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
595                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
596                       Args.hasArg(OPT_cl_fast_relaxed_math);
597   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
598   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
599   Opts.ThreadModel = Args.getLastArgValue(OPT_mthread_model, "posix");
600   if (Opts.ThreadModel != "posix" && Opts.ThreadModel != "single")
601     Diags.Report(diag::err_drv_invalid_value)
602         << Args.getLastArg(OPT_mthread_model)->getAsString(Args)
603         << Opts.ThreadModel;
604   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
605   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
606 
607   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
608                                        OPT_fno_function_sections, false);
609   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
610                                    OPT_fno_data_sections, false);
611   Opts.UniqueSectionNames = Args.hasFlag(OPT_funique_section_names,
612                                          OPT_fno_unique_section_names, true);
613 
614   Opts.MergeFunctions = Args.hasArg(OPT_fmerge_functions);
615 
616   Opts.NoUseJumpTables = Args.hasArg(OPT_fno_jump_tables);
617 
618   Opts.PrepareForLTO = Args.hasArg(OPT_flto, OPT_flto_EQ);
619   const Arg *A = Args.getLastArg(OPT_flto, OPT_flto_EQ);
620   Opts.EmitSummaryIndex = A && A->containsValue("thin");
621   if (Arg *A = Args.getLastArg(OPT_fthinlto_index_EQ)) {
622     if (IK != IK_LLVM_IR)
623       Diags.Report(diag::err_drv_argument_only_allowed_with)
624           << A->getAsString(Args) << "-x ir";
625     Opts.ThinLTOIndexFile = Args.getLastArgValue(OPT_fthinlto_index_EQ);
626   }
627 
628   Opts.MSVolatile = Args.hasArg(OPT_fms_volatile);
629 
630   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
631   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
632   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
633 
634   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
635   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
636 
637   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
638   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
639   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
640   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
641     Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
642     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
643     Opts.CoverageNoFunctionNamesInData =
644         Args.hasArg(OPT_coverage_no_function_names_in_data);
645     Opts.CoverageExitBlockBeforeBody =
646         Args.hasArg(OPT_coverage_exit_block_before_body);
647     if (Args.hasArg(OPT_coverage_version_EQ)) {
648       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
649       if (CoverageVersion.size() != 4) {
650         Diags.Report(diag::err_drv_invalid_value)
651             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
652             << CoverageVersion;
653       } else {
654         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
655       }
656     }
657   }
658 	// Handle -fembed-bitcode option.
659   if (Arg *A = Args.getLastArg(OPT_fembed_bitcode_EQ)) {
660     StringRef Name = A->getValue();
661     unsigned Model = llvm::StringSwitch<unsigned>(Name)
662         .Case("off", CodeGenOptions::Embed_Off)
663         .Case("all", CodeGenOptions::Embed_All)
664         .Case("bitcode", CodeGenOptions::Embed_Bitcode)
665         .Case("marker", CodeGenOptions::Embed_Marker)
666         .Default(~0U);
667     if (Model == ~0U) {
668       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
669       Success = false;
670     } else
671       Opts.setEmbedBitcode(
672           static_cast<CodeGenOptions::EmbedBitcodeKind>(Model));
673   }
674   // FIXME: For backend options that are not yet recorded as function
675   // attributes in the IR, keep track of them so we can embed them in a
676   // separate data section and use them when building the bitcode.
677   if (Opts.getEmbedBitcode() == CodeGenOptions::Embed_All) {
678     for (const auto &A : Args) {
679       // Do not encode output and input.
680       if (A->getOption().getID() == options::OPT_o ||
681           A->getOption().getID() == options::OPT_INPUT ||
682           A->getOption().getID() == options::OPT_x ||
683           A->getOption().getID() == options::OPT_fembed_bitcode ||
684           (A->getOption().getGroup().isValid() &&
685            A->getOption().getGroup().getID() == options::OPT_W_Group))
686         continue;
687       ArgStringList ASL;
688       A->render(Args, ASL);
689       for (const auto &arg : ASL) {
690         StringRef ArgStr(arg);
691         Opts.CmdArgs.insert(Opts.CmdArgs.end(), ArgStr.begin(), ArgStr.end());
692         // using \00 to seperate each commandline options.
693         Opts.CmdArgs.push_back('\0');
694       }
695     }
696   }
697 
698   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
699   Opts.XRayInstrumentFunctions = Args.hasArg(OPT_fxray_instrument);
700   Opts.XRayInstructionThreshold =
701       getLastArgIntValue(Args, OPT_fxray_instruction_threshold_, 200, Diags);
702   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
703   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
704   Opts.CompressDebugSections = Args.hasArg(OPT_compress_debug_sections);
705   Opts.RelaxELFRelocations = Args.hasArg(OPT_mrelax_relocations);
706   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
707   for (auto A : Args.filtered(OPT_mlink_bitcode_file, OPT_mlink_cuda_bitcode)) {
708     unsigned LinkFlags = llvm::Linker::Flags::None;
709     if (A->getOption().matches(OPT_mlink_cuda_bitcode))
710       LinkFlags = llvm::Linker::Flags::LinkOnlyNeeded |
711                   llvm::Linker::Flags::InternalizeLinkedSymbols;
712     Opts.LinkBitcodeFiles.push_back(std::make_pair(LinkFlags, A->getValue()));
713   }
714   Opts.SanitizeCoverageType =
715       getLastArgIntValue(Args, OPT_fsanitize_coverage_type, 0, Diags);
716   Opts.SanitizeCoverageIndirectCalls =
717       Args.hasArg(OPT_fsanitize_coverage_indirect_calls);
718   Opts.SanitizeCoverageTraceBB = Args.hasArg(OPT_fsanitize_coverage_trace_bb);
719   Opts.SanitizeCoverageTraceCmp = Args.hasArg(OPT_fsanitize_coverage_trace_cmp);
720   Opts.SanitizeCoverage8bitCounters =
721       Args.hasArg(OPT_fsanitize_coverage_8bit_counters);
722   Opts.SanitizeCoverageTracePC = Args.hasArg(OPT_fsanitize_coverage_trace_pc);
723   Opts.SanitizeMemoryTrackOrigins =
724       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
725   Opts.SanitizeMemoryUseAfterDtor =
726       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
727   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
728   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
729   Opts.SanitizeAddressUseAfterScope =
730       Args.hasArg(OPT_fsanitize_address_use_after_scope);
731   Opts.SSPBufferSize =
732       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
733   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
734   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
735     StringRef Val = A->getValue();
736     unsigned StackAlignment = Opts.StackAlignment;
737     Val.getAsInteger(10, StackAlignment);
738     Opts.StackAlignment = StackAlignment;
739   }
740 
741   if (Arg *A = Args.getLastArg(OPT_mstack_probe_size)) {
742     StringRef Val = A->getValue();
743     unsigned StackProbeSize = Opts.StackProbeSize;
744     Val.getAsInteger(0, StackProbeSize);
745     Opts.StackProbeSize = StackProbeSize;
746   }
747 
748   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
749     StringRef Name = A->getValue();
750     unsigned Method = llvm::StringSwitch<unsigned>(Name)
751       .Case("legacy", CodeGenOptions::Legacy)
752       .Case("non-legacy", CodeGenOptions::NonLegacy)
753       .Case("mixed", CodeGenOptions::Mixed)
754       .Default(~0U);
755     if (Method == ~0U) {
756       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
757       Success = false;
758     } else {
759       Opts.setObjCDispatchMethod(
760         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
761     }
762   }
763 
764   Opts.EmulatedTLS =
765       Args.hasFlag(OPT_femulated_tls, OPT_fno_emulated_tls, false);
766 
767   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
768     StringRef Name = A->getValue();
769     unsigned Model = llvm::StringSwitch<unsigned>(Name)
770         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
771         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
772         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
773         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
774         .Default(~0U);
775     if (Model == ~0U) {
776       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
777       Success = false;
778     } else {
779       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
780     }
781   }
782 
783   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
784     StringRef Val = A->getValue();
785     if (Val == "fast")
786       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
787     else if (Val == "on")
788       Opts.setFPContractMode(CodeGenOptions::FPC_On);
789     else if (Val == "off")
790       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
791     else
792       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
793   }
794 
795   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
796     if (A->getOption().matches(OPT_fpcc_struct_return)) {
797       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
798     } else {
799       assert(A->getOption().matches(OPT_freg_struct_return));
800       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
801     }
802   }
803 
804   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
805   Opts.LinkerOptions = Args.getAllArgValues(OPT_linker_option);
806   bool NeedLocTracking = false;
807 
808   if (Arg *A = Args.getLastArg(OPT_Rpass_EQ)) {
809     Opts.OptimizationRemarkPattern =
810         GenerateOptimizationRemarkRegex(Diags, Args, A);
811     NeedLocTracking = true;
812   }
813 
814   if (Arg *A = Args.getLastArg(OPT_Rpass_missed_EQ)) {
815     Opts.OptimizationRemarkMissedPattern =
816         GenerateOptimizationRemarkRegex(Diags, Args, A);
817     NeedLocTracking = true;
818   }
819 
820   if (Arg *A = Args.getLastArg(OPT_Rpass_analysis_EQ)) {
821     Opts.OptimizationRemarkAnalysisPattern =
822         GenerateOptimizationRemarkRegex(Diags, Args, A);
823     NeedLocTracking = true;
824   }
825 
826   // If the user requested to use a sample profile for PGO, then the
827   // backend will need to track source location information so the profile
828   // can be incorporated into the IR.
829   if (!Opts.SampleProfileFile.empty())
830     NeedLocTracking = true;
831 
832   // If the user requested a flag that requires source locations available in
833   // the backend, make sure that the backend tracks source location information.
834   if (NeedLocTracking && Opts.getDebugInfo() == codegenoptions::NoDebugInfo)
835     Opts.setDebugInfo(codegenoptions::LocTrackingOnly);
836 
837   Opts.RewriteMapFiles = Args.getAllArgValues(OPT_frewrite_map_file);
838 
839   // Parse -fsanitize-recover= arguments.
840   // FIXME: Report unrecoverable sanitizers incorrectly specified here.
841   parseSanitizerKinds("-fsanitize-recover=",
842                       Args.getAllArgValues(OPT_fsanitize_recover_EQ), Diags,
843                       Opts.SanitizeRecover);
844   parseSanitizerKinds("-fsanitize-trap=",
845                       Args.getAllArgValues(OPT_fsanitize_trap_EQ), Diags,
846                       Opts.SanitizeTrap);
847 
848   Opts.CudaGpuBinaryFileNames =
849       Args.getAllArgValues(OPT_fcuda_include_gpubinary);
850 
851   Opts.Backchain = Args.hasArg(OPT_mbackchain);
852 
853   Opts.EmitCheckPathComponentsToStrip = getLastArgIntValue(
854       Args, OPT_fsanitize_undefined_strip_path_components_EQ, 0, Diags);
855 
856   return Success;
857 }
858 
859 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
860                                       ArgList &Args) {
861   using namespace options;
862   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
863   Opts.Targets = Args.getAllArgValues(OPT_MT);
864   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
865   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
866   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
867   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
868   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
869   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
870   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
871   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
872   Opts.ModuleDependencyOutputDir =
873       Args.getLastArgValue(OPT_module_dependency_dir);
874   if (Args.hasArg(OPT_MV))
875     Opts.OutputFormat = DependencyOutputFormat::NMake;
876   // Add sanitizer blacklists as extra dependencies.
877   // They won't be discovered by the regular preprocessor, so
878   // we let make / ninja to know about this implicit dependency.
879   Opts.ExtraDeps = Args.getAllArgValues(OPT_fdepfile_entry);
880   auto ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
881   Opts.ExtraDeps.insert(Opts.ExtraDeps.end(), ModuleFiles.begin(),
882                         ModuleFiles.end());
883 }
884 
885 static bool parseShowColorsArgs(const ArgList &Args, bool DefaultColor) {
886   // Color diagnostics default to auto ("on" if terminal supports) in the driver
887   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
888   // Support both clang's -f[no-]color-diagnostics and gcc's
889   // -f[no-]diagnostics-colors[=never|always|auto].
890   enum {
891     Colors_On,
892     Colors_Off,
893     Colors_Auto
894   } ShowColors = DefaultColor ? Colors_Auto : Colors_Off;
895   for (Arg *A : Args) {
896     const Option &O = A->getOption();
897     if (!O.matches(options::OPT_fcolor_diagnostics) &&
898         !O.matches(options::OPT_fdiagnostics_color) &&
899         !O.matches(options::OPT_fno_color_diagnostics) &&
900         !O.matches(options::OPT_fno_diagnostics_color) &&
901         !O.matches(options::OPT_fdiagnostics_color_EQ))
902       continue;
903 
904     if (O.matches(options::OPT_fcolor_diagnostics) ||
905         O.matches(options::OPT_fdiagnostics_color)) {
906       ShowColors = Colors_On;
907     } else if (O.matches(options::OPT_fno_color_diagnostics) ||
908                O.matches(options::OPT_fno_diagnostics_color)) {
909       ShowColors = Colors_Off;
910     } else {
911       assert(O.matches(options::OPT_fdiagnostics_color_EQ));
912       StringRef Value(A->getValue());
913       if (Value == "always")
914         ShowColors = Colors_On;
915       else if (Value == "never")
916         ShowColors = Colors_Off;
917       else if (Value == "auto")
918         ShowColors = Colors_Auto;
919     }
920   }
921   if (ShowColors == Colors_On ||
922       (ShowColors == Colors_Auto && llvm::sys::Process::StandardErrHasColors()))
923     return true;
924   return false;
925 }
926 
927 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
928                                 DiagnosticsEngine *Diags,
929                                 bool DefaultDiagColor) {
930   using namespace options;
931   bool Success = true;
932 
933   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
934   if (Arg *A =
935           Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
936     Opts.DiagnosticSerializationFile = A->getValue();
937   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
938   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
939   Opts.Pedantic = Args.hasArg(OPT_pedantic);
940   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
941   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
942   Opts.ShowColors = parseShowColorsArgs(Args, DefaultDiagColor);
943   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
944                                  OPT_fno_show_column,
945                                  /*Default=*/true);
946   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
947   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
948   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
949 
950   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
951 
952   // Default behavior is to not to show note include stacks.
953   Opts.ShowNoteIncludeStack = false;
954   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
955                                OPT_fno_diagnostics_show_note_include_stack))
956     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
957       Opts.ShowNoteIncludeStack = true;
958 
959   StringRef ShowOverloads =
960     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
961   if (ShowOverloads == "best")
962     Opts.setShowOverloads(Ovl_Best);
963   else if (ShowOverloads == "all")
964     Opts.setShowOverloads(Ovl_All);
965   else {
966     Success = false;
967     if (Diags)
968       Diags->Report(diag::err_drv_invalid_value)
969       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
970       << ShowOverloads;
971   }
972 
973   StringRef ShowCategory =
974     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
975   if (ShowCategory == "none")
976     Opts.ShowCategories = 0;
977   else if (ShowCategory == "id")
978     Opts.ShowCategories = 1;
979   else if (ShowCategory == "name")
980     Opts.ShowCategories = 2;
981   else {
982     Success = false;
983     if (Diags)
984       Diags->Report(diag::err_drv_invalid_value)
985       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
986       << ShowCategory;
987   }
988 
989   StringRef Format =
990     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
991   if (Format == "clang")
992     Opts.setFormat(DiagnosticOptions::Clang);
993   else if (Format == "msvc")
994     Opts.setFormat(DiagnosticOptions::MSVC);
995   else if (Format == "msvc-fallback") {
996     Opts.setFormat(DiagnosticOptions::MSVC);
997     Opts.CLFallbackMode = true;
998   } else if (Format == "vi")
999     Opts.setFormat(DiagnosticOptions::Vi);
1000   else {
1001     Success = false;
1002     if (Diags)
1003       Diags->Report(diag::err_drv_invalid_value)
1004       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
1005       << Format;
1006   }
1007 
1008   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
1009   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
1010   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
1011   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
1012   DiagnosticLevelMask DiagMask = DiagnosticLevelMask::None;
1013   Success &= parseDiagnosticLevelMask("-verify-ignore-unexpected=",
1014     Args.getAllArgValues(OPT_verify_ignore_unexpected_EQ),
1015     Diags, DiagMask);
1016   if (Args.hasArg(OPT_verify_ignore_unexpected))
1017     DiagMask = DiagnosticLevelMask::All;
1018   Opts.setVerifyIgnoreUnexpected(DiagMask);
1019   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
1020   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
1021   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
1022   Opts.MacroBacktraceLimit =
1023       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
1024                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
1025   Opts.TemplateBacktraceLimit = getLastArgIntValue(
1026       Args, OPT_ftemplate_backtrace_limit,
1027       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
1028   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
1029       Args, OPT_fconstexpr_backtrace_limit,
1030       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
1031   Opts.SpellCheckingLimit = getLastArgIntValue(
1032       Args, OPT_fspell_checking_limit,
1033       DiagnosticOptions::DefaultSpellCheckingLimit, Diags);
1034   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
1035                                     DiagnosticOptions::DefaultTabStop, Diags);
1036   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
1037     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
1038     if (Diags)
1039       Diags->Report(diag::warn_ignoring_ftabstop_value)
1040       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
1041   }
1042   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
1043   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
1044   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
1045 
1046   return Success;
1047 }
1048 
1049 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
1050   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
1051 }
1052 
1053 /// Parse the argument to the -ftest-module-file-extension
1054 /// command-line argument.
1055 ///
1056 /// \returns true on error, false on success.
1057 static bool parseTestModuleFileExtensionArg(StringRef Arg,
1058                                             std::string &BlockName,
1059                                             unsigned &MajorVersion,
1060                                             unsigned &MinorVersion,
1061                                             bool &Hashed,
1062                                             std::string &UserInfo) {
1063   SmallVector<StringRef, 5> Args;
1064   Arg.split(Args, ':', 5);
1065   if (Args.size() < 5)
1066     return true;
1067 
1068   BlockName = Args[0];
1069   if (Args[1].getAsInteger(10, MajorVersion)) return true;
1070   if (Args[2].getAsInteger(10, MinorVersion)) return true;
1071   if (Args[3].getAsInteger(2, Hashed)) return true;
1072   if (Args.size() > 4)
1073     UserInfo = Args[4];
1074   return false;
1075 }
1076 
1077 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
1078                                    DiagnosticsEngine &Diags) {
1079   using namespace options;
1080   Opts.ProgramAction = frontend::ParseSyntaxOnly;
1081   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
1082     switch (A->getOption().getID()) {
1083     default:
1084       llvm_unreachable("Invalid option in group!");
1085     case OPT_ast_list:
1086       Opts.ProgramAction = frontend::ASTDeclList; break;
1087     case OPT_ast_dump:
1088     case OPT_ast_dump_lookups:
1089       Opts.ProgramAction = frontend::ASTDump; break;
1090     case OPT_ast_print:
1091       Opts.ProgramAction = frontend::ASTPrint; break;
1092     case OPT_ast_view:
1093       Opts.ProgramAction = frontend::ASTView; break;
1094     case OPT_dump_raw_tokens:
1095       Opts.ProgramAction = frontend::DumpRawTokens; break;
1096     case OPT_dump_tokens:
1097       Opts.ProgramAction = frontend::DumpTokens; break;
1098     case OPT_S:
1099       Opts.ProgramAction = frontend::EmitAssembly; break;
1100     case OPT_emit_llvm_bc:
1101       Opts.ProgramAction = frontend::EmitBC; break;
1102     case OPT_emit_html:
1103       Opts.ProgramAction = frontend::EmitHTML; break;
1104     case OPT_emit_llvm:
1105       Opts.ProgramAction = frontend::EmitLLVM; break;
1106     case OPT_emit_llvm_only:
1107       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
1108     case OPT_emit_codegen_only:
1109       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
1110     case OPT_emit_obj:
1111       Opts.ProgramAction = frontend::EmitObj; break;
1112     case OPT_fixit_EQ:
1113       Opts.FixItSuffix = A->getValue();
1114       // fall-through!
1115     case OPT_fixit:
1116       Opts.ProgramAction = frontend::FixIt; break;
1117     case OPT_emit_module:
1118       Opts.ProgramAction = frontend::GenerateModule; break;
1119     case OPT_emit_pch:
1120       Opts.ProgramAction = frontend::GeneratePCH; break;
1121     case OPT_emit_pth:
1122       Opts.ProgramAction = frontend::GeneratePTH; break;
1123     case OPT_init_only:
1124       Opts.ProgramAction = frontend::InitOnly; break;
1125     case OPT_fsyntax_only:
1126       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
1127     case OPT_module_file_info:
1128       Opts.ProgramAction = frontend::ModuleFileInfo; break;
1129     case OPT_verify_pch:
1130       Opts.ProgramAction = frontend::VerifyPCH; break;
1131     case OPT_print_decl_contexts:
1132       Opts.ProgramAction = frontend::PrintDeclContext; break;
1133     case OPT_print_preamble:
1134       Opts.ProgramAction = frontend::PrintPreamble; break;
1135     case OPT_E:
1136       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
1137     case OPT_rewrite_macros:
1138       Opts.ProgramAction = frontend::RewriteMacros; break;
1139     case OPT_rewrite_objc:
1140       Opts.ProgramAction = frontend::RewriteObjC; break;
1141     case OPT_rewrite_test:
1142       Opts.ProgramAction = frontend::RewriteTest; break;
1143     case OPT_analyze:
1144       Opts.ProgramAction = frontend::RunAnalysis; break;
1145     case OPT_migrate:
1146       Opts.ProgramAction = frontend::MigrateSource; break;
1147     case OPT_Eonly:
1148       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
1149     }
1150   }
1151 
1152   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
1153     Opts.Plugins.emplace_back(A->getValue(0));
1154     Opts.ProgramAction = frontend::PluginAction;
1155     Opts.ActionName = A->getValue();
1156   }
1157   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
1158   for (const Arg *AA : Args.filtered(OPT_plugin_arg))
1159     Opts.PluginArgs[AA->getValue(0)].emplace_back(AA->getValue(1));
1160 
1161   for (const std::string &Arg :
1162          Args.getAllArgValues(OPT_ftest_module_file_extension_EQ)) {
1163     std::string BlockName;
1164     unsigned MajorVersion;
1165     unsigned MinorVersion;
1166     bool Hashed;
1167     std::string UserInfo;
1168     if (parseTestModuleFileExtensionArg(Arg, BlockName, MajorVersion,
1169                                         MinorVersion, Hashed, UserInfo)) {
1170       Diags.Report(diag::err_test_module_file_extension_format) << Arg;
1171 
1172       continue;
1173     }
1174 
1175     // Add the testing module file extension.
1176     Opts.ModuleFileExtensions.push_back(
1177       new TestModuleFileExtension(BlockName, MajorVersion, MinorVersion,
1178                                   Hashed, UserInfo));
1179   }
1180 
1181   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
1182     Opts.CodeCompletionAt =
1183       ParsedSourceLocation::FromString(A->getValue());
1184     if (Opts.CodeCompletionAt.FileName.empty())
1185       Diags.Report(diag::err_drv_invalid_value)
1186         << A->getAsString(Args) << A->getValue();
1187   }
1188   Opts.DisableFree = Args.hasArg(OPT_disable_free);
1189 
1190   Opts.OutputFile = Args.getLastArgValue(OPT_o);
1191   Opts.Plugins = Args.getAllArgValues(OPT_load);
1192   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
1193   Opts.ShowHelp = Args.hasArg(OPT_help);
1194   Opts.ShowStats = Args.hasArg(OPT_print_stats);
1195   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
1196   Opts.ShowVersion = Args.hasArg(OPT_version);
1197   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
1198   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
1199   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
1200   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
1201   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
1202   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
1203   Opts.ASTDumpDecls = Args.hasArg(OPT_ast_dump);
1204   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
1205   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
1206   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
1207   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
1208   Opts.ModuleMapFiles = Args.getAllArgValues(OPT_fmodule_map_file);
1209   Opts.ModuleFiles = Args.getAllArgValues(OPT_fmodule_file);
1210   Opts.ModulesEmbedFiles = Args.getAllArgValues(OPT_fmodules_embed_file_EQ);
1211   Opts.ModulesEmbedAllFiles = Args.hasArg(OPT_fmodules_embed_all_files);
1212   Opts.IncludeTimestamps = !Args.hasArg(OPT_fno_pch_timestamp);
1213 
1214   Opts.CodeCompleteOpts.IncludeMacros
1215     = Args.hasArg(OPT_code_completion_macros);
1216   Opts.CodeCompleteOpts.IncludeCodePatterns
1217     = Args.hasArg(OPT_code_completion_patterns);
1218   Opts.CodeCompleteOpts.IncludeGlobals
1219     = !Args.hasArg(OPT_no_code_completion_globals);
1220   Opts.CodeCompleteOpts.IncludeBriefComments
1221     = Args.hasArg(OPT_code_completion_brief_comments);
1222 
1223   Opts.OverrideRecordLayoutsFile
1224     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
1225   Opts.AuxTriple =
1226       llvm::Triple::normalize(Args.getLastArgValue(OPT_aux_triple));
1227   Opts.FindPchSource = Args.getLastArgValue(OPT_find_pch_source_EQ);
1228 
1229   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
1230                                      OPT_arcmt_modify,
1231                                      OPT_arcmt_migrate)) {
1232     switch (A->getOption().getID()) {
1233     default:
1234       llvm_unreachable("missed a case");
1235     case OPT_arcmt_check:
1236       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
1237       break;
1238     case OPT_arcmt_modify:
1239       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
1240       break;
1241     case OPT_arcmt_migrate:
1242       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
1243       break;
1244     }
1245   }
1246   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
1247   Opts.ARCMTMigrateReportOut
1248     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
1249   Opts.ARCMTMigrateEmitARCErrors
1250     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
1251 
1252   if (Args.hasArg(OPT_objcmt_migrate_literals))
1253     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
1254   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
1255     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
1256   if (Args.hasArg(OPT_objcmt_migrate_property_dot_syntax))
1257     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_PropertyDotSyntax;
1258   if (Args.hasArg(OPT_objcmt_migrate_property))
1259     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
1260   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
1261     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
1262   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
1263     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
1264   if (Args.hasArg(OPT_objcmt_migrate_annotation))
1265     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
1266   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
1267     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
1268   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
1269     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
1270   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
1271     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
1272   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
1273     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
1274   if (Args.hasArg(OPT_objcmt_atomic_property))
1275     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
1276   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
1277     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
1278   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
1279     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
1280   if (Args.hasArg(OPT_objcmt_migrate_all))
1281     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
1282 
1283   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
1284 
1285   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
1286       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
1287     Diags.Report(diag::err_drv_argument_not_allowed_with)
1288       << "ARC migration" << "ObjC migration";
1289   }
1290 
1291   InputKind DashX = IK_None;
1292   if (const Arg *A = Args.getLastArg(OPT_x)) {
1293     DashX = llvm::StringSwitch<InputKind>(A->getValue())
1294       .Case("c", IK_C)
1295       .Case("cl", IK_OpenCL)
1296       .Case("cuda", IK_CUDA)
1297       .Case("c++", IK_CXX)
1298       .Case("objective-c", IK_ObjC)
1299       .Case("objective-c++", IK_ObjCXX)
1300       .Case("cpp-output", IK_PreprocessedC)
1301       .Case("assembler-with-cpp", IK_Asm)
1302       .Case("c++-cpp-output", IK_PreprocessedCXX)
1303       .Case("cuda-cpp-output", IK_PreprocessedCuda)
1304       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
1305       .Case("objc-cpp-output", IK_PreprocessedObjC)
1306       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
1307       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
1308       .Case("c-header", IK_C)
1309       .Case("cl-header", IK_OpenCL)
1310       .Case("objective-c-header", IK_ObjC)
1311       .Case("c++-header", IK_CXX)
1312       .Case("objective-c++-header", IK_ObjCXX)
1313       .Cases("ast", "pcm", IK_AST)
1314       .Case("ir", IK_LLVM_IR)
1315       .Case("renderscript", IK_RenderScript)
1316       .Default(IK_None);
1317     if (DashX == IK_None)
1318       Diags.Report(diag::err_drv_invalid_value)
1319         << A->getAsString(Args) << A->getValue();
1320   }
1321 
1322   // '-' is the default input if none is given.
1323   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
1324   Opts.Inputs.clear();
1325   if (Inputs.empty())
1326     Inputs.push_back("-");
1327   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
1328     InputKind IK = DashX;
1329     if (IK == IK_None) {
1330       IK = FrontendOptions::getInputKindForExtension(
1331         StringRef(Inputs[i]).rsplit('.').second);
1332       // FIXME: Remove this hack.
1333       if (i == 0)
1334         DashX = IK;
1335     }
1336     Opts.Inputs.emplace_back(std::move(Inputs[i]), IK);
1337   }
1338 
1339   return DashX;
1340 }
1341 
1342 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
1343                                                  void *MainAddr) {
1344   std::string ClangExecutable =
1345       llvm::sys::fs::getMainExecutable(Argv0, MainAddr);
1346   StringRef Dir = llvm::sys::path::parent_path(ClangExecutable);
1347 
1348   // Compute the path to the resource directory.
1349   StringRef ClangResourceDir(CLANG_RESOURCE_DIR);
1350   SmallString<128> P(Dir);
1351   if (ClangResourceDir != "")
1352     llvm::sys::path::append(P, ClangResourceDir);
1353   else
1354     llvm::sys::path::append(P, "..", Twine("lib") + CLANG_LIBDIR_SUFFIX,
1355                             "clang", CLANG_VERSION_STRING);
1356 
1357   return P.str();
1358 }
1359 
1360 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
1361   using namespace options;
1362   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
1363   Opts.Verbose = Args.hasArg(OPT_v);
1364   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
1365   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
1366   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
1367   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
1368     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
1369   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
1370   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
1371   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
1372   for (const Arg *A : Args.filtered(OPT_fprebuilt_module_path))
1373     Opts.AddPrebuiltModulePath(A->getValue());
1374   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
1375   Opts.ModulesValidateDiagnosticOptions =
1376       !Args.hasArg(OPT_fmodules_disable_diagnostic_validation);
1377   Opts.ImplicitModuleMaps = Args.hasArg(OPT_fimplicit_module_maps);
1378   Opts.ModuleMapFileHomeIsCwd = Args.hasArg(OPT_fmodule_map_file_home_is_cwd);
1379   Opts.ModuleCachePruneInterval =
1380       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
1381   Opts.ModuleCachePruneAfter =
1382       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
1383   Opts.ModulesValidateOncePerBuildSession =
1384       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
1385   Opts.BuildSessionTimestamp =
1386       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
1387   Opts.ModulesValidateSystemHeaders =
1388       Args.hasArg(OPT_fmodules_validate_system_headers);
1389   if (const Arg *A = Args.getLastArg(OPT_fmodule_format_EQ))
1390     Opts.ModuleFormat = A->getValue();
1391 
1392   for (const Arg *A : Args.filtered(OPT_fmodules_ignore_macro)) {
1393     StringRef MacroDef = A->getValue();
1394     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
1395   }
1396 
1397   // Add -I..., -F..., and -index-header-map options in order.
1398   bool IsIndexHeaderMap = false;
1399   bool IsSysrootSpecified =
1400       Args.hasArg(OPT__sysroot_EQ) || Args.hasArg(OPT_isysroot);
1401   for (const Arg *A : Args.filtered(OPT_I, OPT_F, OPT_index_header_map)) {
1402     if (A->getOption().matches(OPT_index_header_map)) {
1403       // -index-header-map applies to the next -I or -F.
1404       IsIndexHeaderMap = true;
1405       continue;
1406     }
1407 
1408     frontend::IncludeDirGroup Group =
1409         IsIndexHeaderMap ? frontend::IndexHeaderMap : frontend::Angled;
1410 
1411     bool IsFramework = A->getOption().matches(OPT_F);
1412     std::string Path = A->getValue();
1413 
1414     if (IsSysrootSpecified && !IsFramework && A->getValue()[0] == '=') {
1415       SmallString<32> Buffer;
1416       llvm::sys::path::append(Buffer, Opts.Sysroot,
1417                               llvm::StringRef(A->getValue()).substr(1));
1418       Path = Buffer.str();
1419     }
1420 
1421     Opts.AddPath(Path.c_str(), Group, IsFramework,
1422                  /*IgnoreSysroot*/ true);
1423     IsIndexHeaderMap = false;
1424   }
1425 
1426   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
1427   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
1428   for (const Arg *A :
1429        Args.filtered(OPT_iprefix, OPT_iwithprefix, OPT_iwithprefixbefore)) {
1430     if (A->getOption().matches(OPT_iprefix))
1431       Prefix = A->getValue();
1432     else if (A->getOption().matches(OPT_iwithprefix))
1433       Opts.AddPath(Prefix.str() + A->getValue(), frontend::After, false, true);
1434     else
1435       Opts.AddPath(Prefix.str() + A->getValue(), frontend::Angled, false, true);
1436   }
1437 
1438   for (const Arg *A : Args.filtered(OPT_idirafter))
1439     Opts.AddPath(A->getValue(), frontend::After, false, true);
1440   for (const Arg *A : Args.filtered(OPT_iquote))
1441     Opts.AddPath(A->getValue(), frontend::Quoted, false, true);
1442   for (const Arg *A : Args.filtered(OPT_isystem, OPT_iwithsysroot))
1443     Opts.AddPath(A->getValue(), frontend::System, false,
1444                  !A->getOption().matches(OPT_iwithsysroot));
1445   for (const Arg *A : Args.filtered(OPT_iframework))
1446     Opts.AddPath(A->getValue(), frontend::System, true, true);
1447 
1448   // Add the paths for the various language specific isystem flags.
1449   for (const Arg *A : Args.filtered(OPT_c_isystem))
1450     Opts.AddPath(A->getValue(), frontend::CSystem, false, true);
1451   for (const Arg *A : Args.filtered(OPT_cxx_isystem))
1452     Opts.AddPath(A->getValue(), frontend::CXXSystem, false, true);
1453   for (const Arg *A : Args.filtered(OPT_objc_isystem))
1454     Opts.AddPath(A->getValue(), frontend::ObjCSystem, false,true);
1455   for (const Arg *A : Args.filtered(OPT_objcxx_isystem))
1456     Opts.AddPath(A->getValue(), frontend::ObjCXXSystem, false, true);
1457 
1458   // Add the internal paths from a driver that detects standard include paths.
1459   for (const Arg *A :
1460        Args.filtered(OPT_internal_isystem, OPT_internal_externc_isystem)) {
1461     frontend::IncludeDirGroup Group = frontend::System;
1462     if (A->getOption().matches(OPT_internal_externc_isystem))
1463       Group = frontend::ExternCSystem;
1464     Opts.AddPath(A->getValue(), Group, false, true);
1465   }
1466 
1467   // Add the path prefixes which are implicitly treated as being system headers.
1468   for (const Arg *A :
1469        Args.filtered(OPT_system_header_prefix, OPT_no_system_header_prefix))
1470     Opts.AddSystemHeaderPrefix(
1471         A->getValue(), A->getOption().matches(OPT_system_header_prefix));
1472 
1473   for (const Arg *A : Args.filtered(OPT_ivfsoverlay))
1474     Opts.AddVFSOverlayFile(A->getValue());
1475 }
1476 
1477 static bool isOpenCL(LangStandard::Kind LangStd) {
1478   return LangStd == LangStandard::lang_opencl ||
1479          LangStd == LangStandard::lang_opencl11 ||
1480          LangStd == LangStandard::lang_opencl12 ||
1481          LangStd == LangStandard::lang_opencl20;
1482 }
1483 
1484 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1485                                          const llvm::Triple &T,
1486                                          PreprocessorOptions &PPOpts,
1487                                          LangStandard::Kind LangStd) {
1488   // Set some properties which depend solely on the input kind; it would be nice
1489   // to move these to the language standard, and have the driver resolve the
1490   // input kind + language standard.
1491   if (IK == IK_Asm) {
1492     Opts.AsmPreprocessor = 1;
1493   } else if (IK == IK_ObjC ||
1494              IK == IK_ObjCXX ||
1495              IK == IK_PreprocessedObjC ||
1496              IK == IK_PreprocessedObjCXX) {
1497     Opts.ObjC1 = Opts.ObjC2 = 1;
1498   }
1499 
1500   if (LangStd == LangStandard::lang_unspecified) {
1501     // Based on the base language, pick one.
1502     switch (IK) {
1503     case IK_None:
1504     case IK_AST:
1505     case IK_LLVM_IR:
1506       llvm_unreachable("Invalid input kind!");
1507     case IK_OpenCL:
1508       LangStd = LangStandard::lang_opencl;
1509       break;
1510     case IK_CUDA:
1511     case IK_PreprocessedCuda:
1512       LangStd = LangStandard::lang_cuda;
1513       break;
1514     case IK_Asm:
1515     case IK_C:
1516     case IK_PreprocessedC:
1517     case IK_ObjC:
1518     case IK_PreprocessedObjC:
1519       // The PS4 uses C99 as the default C standard.
1520       if (T.isPS4())
1521         LangStd = LangStandard::lang_gnu99;
1522       else
1523         LangStd = LangStandard::lang_gnu11;
1524       break;
1525     case IK_CXX:
1526     case IK_PreprocessedCXX:
1527     case IK_ObjCXX:
1528     case IK_PreprocessedObjCXX:
1529       LangStd = LangStandard::lang_gnucxx98;
1530       break;
1531     case IK_RenderScript:
1532       LangStd = LangStandard::lang_c99;
1533       break;
1534     }
1535   }
1536 
1537   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1538   Opts.LineComment = Std.hasLineComments();
1539   Opts.C99 = Std.isC99();
1540   Opts.C11 = Std.isC11();
1541   Opts.CPlusPlus = Std.isCPlusPlus();
1542   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1543   Opts.CPlusPlus14 = Std.isCPlusPlus14();
1544   Opts.CPlusPlus1z = Std.isCPlusPlus1z();
1545   Opts.Digraphs = Std.hasDigraphs();
1546   Opts.GNUMode = Std.isGNUMode();
1547   Opts.GNUInline = Std.isC89();
1548   Opts.HexFloats = Std.hasHexFloats();
1549   Opts.ImplicitInt = Std.hasImplicitInt();
1550 
1551   // Set OpenCL Version.
1552   Opts.OpenCL = isOpenCL(LangStd) || IK == IK_OpenCL;
1553   if (LangStd == LangStandard::lang_opencl)
1554     Opts.OpenCLVersion = 100;
1555   else if (LangStd == LangStandard::lang_opencl11)
1556     Opts.OpenCLVersion = 110;
1557   else if (LangStd == LangStandard::lang_opencl12)
1558     Opts.OpenCLVersion = 120;
1559   else if (LangStd == LangStandard::lang_opencl20)
1560     Opts.OpenCLVersion = 200;
1561 
1562   // OpenCL has some additional defaults.
1563   if (Opts.OpenCL) {
1564     Opts.AltiVec = 0;
1565     Opts.ZVector = 0;
1566     Opts.CXXOperatorNames = 1;
1567     Opts.LaxVectorConversions = 0;
1568     Opts.DefaultFPContract = 1;
1569     Opts.NativeHalfType = 1;
1570     Opts.NativeHalfArgsAndReturns = 1;
1571     // Include default header file for OpenCL.
1572     if (Opts.IncludeDefaultHeader) {
1573       PPOpts.Includes.push_back("opencl-c.h");
1574     }
1575   }
1576 
1577   Opts.CUDA = IK == IK_CUDA || IK == IK_PreprocessedCuda ||
1578               LangStd == LangStandard::lang_cuda;
1579 
1580   Opts.RenderScript = IK == IK_RenderScript;
1581   if (Opts.RenderScript) {
1582     Opts.NativeHalfType = 1;
1583     Opts.NativeHalfArgsAndReturns = 1;
1584   }
1585 
1586   // OpenCL and C++ both have bool, true, false keywords.
1587   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1588 
1589   // OpenCL has half keyword
1590   Opts.Half = Opts.OpenCL;
1591 
1592   // C++ has wchar_t keyword.
1593   Opts.WChar = Opts.CPlusPlus;
1594 
1595   Opts.GNUKeywords = Opts.GNUMode;
1596   Opts.CXXOperatorNames = Opts.CPlusPlus;
1597 
1598   Opts.DollarIdents = !Opts.AsmPreprocessor;
1599 }
1600 
1601 /// Attempt to parse a visibility value out of the given argument.
1602 static Visibility parseVisibility(Arg *arg, ArgList &args,
1603                                   DiagnosticsEngine &diags) {
1604   StringRef value = arg->getValue();
1605   if (value == "default") {
1606     return DefaultVisibility;
1607   } else if (value == "hidden" || value == "internal") {
1608     return HiddenVisibility;
1609   } else if (value == "protected") {
1610     // FIXME: diagnose if target does not support protected visibility
1611     return ProtectedVisibility;
1612   }
1613 
1614   diags.Report(diag::err_drv_invalid_value)
1615     << arg->getAsString(args) << value;
1616   return DefaultVisibility;
1617 }
1618 
1619 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1620                           const TargetOptions &TargetOpts,
1621                           PreprocessorOptions &PPOpts,
1622                           DiagnosticsEngine &Diags) {
1623   // FIXME: Cleanup per-file based stuff.
1624   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1625   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1626     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1627 #define LANGSTANDARD(id, name, desc, features) \
1628       .Case(name, LangStandard::lang_##id)
1629 #define LANGSTANDARD_ALIAS(id, alias) \
1630       .Case(alias, LangStandard::lang_##id)
1631 #include "clang/Frontend/LangStandards.def"
1632       .Default(LangStandard::lang_unspecified);
1633     if (LangStd == LangStandard::lang_unspecified)
1634       Diags.Report(diag::err_drv_invalid_value)
1635         << A->getAsString(Args) << A->getValue();
1636     else {
1637       // Valid standard, check to make sure language and standard are
1638       // compatible.
1639       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1640       switch (IK) {
1641       case IK_C:
1642       case IK_ObjC:
1643       case IK_PreprocessedC:
1644       case IK_PreprocessedObjC:
1645         if (!(Std.isC89() || Std.isC99()))
1646           Diags.Report(diag::err_drv_argument_not_allowed_with)
1647             << A->getAsString(Args) << "C/ObjC";
1648         break;
1649       case IK_CXX:
1650       case IK_ObjCXX:
1651       case IK_PreprocessedCXX:
1652       case IK_PreprocessedObjCXX:
1653         if (!Std.isCPlusPlus())
1654           Diags.Report(diag::err_drv_argument_not_allowed_with)
1655             << A->getAsString(Args) << "C++/ObjC++";
1656         break;
1657       case IK_OpenCL:
1658         if (!isOpenCL(LangStd))
1659           Diags.Report(diag::err_drv_argument_not_allowed_with)
1660             << A->getAsString(Args) << "OpenCL";
1661         break;
1662       case IK_CUDA:
1663       case IK_PreprocessedCuda:
1664         if (!Std.isCPlusPlus())
1665           Diags.Report(diag::err_drv_argument_not_allowed_with)
1666             << A->getAsString(Args) << "CUDA";
1667         break;
1668       default:
1669         break;
1670       }
1671     }
1672   }
1673 
1674   // -cl-std only applies for OpenCL language standards.
1675   // Override the -std option in this case.
1676   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1677     LangStandard::Kind OpenCLLangStd
1678     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1679     .Cases("cl", "CL", LangStandard::lang_opencl)
1680     .Cases("cl1.1", "CL1.1", LangStandard::lang_opencl11)
1681     .Cases("cl1.2", "CL1.2", LangStandard::lang_opencl12)
1682     .Cases("cl2.0", "CL2.0", LangStandard::lang_opencl20)
1683     .Default(LangStandard::lang_unspecified);
1684 
1685     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1686       Diags.Report(diag::err_drv_invalid_value)
1687       << A->getAsString(Args) << A->getValue();
1688     }
1689     else
1690       LangStd = OpenCLLangStd;
1691   }
1692 
1693   Opts.IncludeDefaultHeader = Args.hasArg(OPT_finclude_default_header);
1694 
1695   llvm::Triple T(TargetOpts.Triple);
1696   CompilerInvocation::setLangDefaults(Opts, IK, T, PPOpts, LangStd);
1697 
1698   // -cl-strict-aliasing needs to emit diagnostic in the case where CL > 1.0.
1699   // This option should be deprecated for CL > 1.0 because
1700   // this option was added for compatibility with OpenCL 1.0.
1701   if (Args.getLastArg(OPT_cl_strict_aliasing)
1702        && Opts.OpenCLVersion > 100) {
1703     std::string VerSpec = llvm::to_string(Opts.OpenCLVersion / 100) +
1704                           std::string(".") +
1705                           llvm::to_string((Opts.OpenCLVersion % 100) / 10);
1706     Diags.Report(diag::warn_option_invalid_ocl_version)
1707       << VerSpec << Args.getLastArg(OPT_cl_strict_aliasing)->getAsString(Args);
1708   }
1709 
1710   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1711   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1712   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1713   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1714   // name, as it doesn't seem a useful distinction.
1715   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1716                                   Opts.GNUKeywords);
1717 
1718   if (Args.hasArg(OPT_fno_operator_names))
1719     Opts.CXXOperatorNames = 0;
1720 
1721   if (Args.hasArg(OPT_fcuda_is_device))
1722     Opts.CUDAIsDevice = 1;
1723 
1724   if (Args.hasArg(OPT_fcuda_allow_variadic_functions))
1725     Opts.CUDAAllowVariadicFunctions = 1;
1726 
1727   if (Args.hasArg(OPT_fno_cuda_host_device_constexpr))
1728     Opts.CUDAHostDeviceConstexpr = 0;
1729 
1730   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_flush_denormals_to_zero))
1731     Opts.CUDADeviceFlushDenormalsToZero = 1;
1732 
1733   if (Opts.CUDAIsDevice && Args.hasArg(OPT_fcuda_approx_transcendentals))
1734     Opts.CUDADeviceApproxTranscendentals = 1;
1735 
1736   if (Opts.ObjC1) {
1737     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1738       StringRef value = arg->getValue();
1739       if (Opts.ObjCRuntime.tryParse(value))
1740         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1741     }
1742 
1743     if (Args.hasArg(OPT_fobjc_gc_only))
1744       Opts.setGC(LangOptions::GCOnly);
1745     else if (Args.hasArg(OPT_fobjc_gc))
1746       Opts.setGC(LangOptions::HybridGC);
1747     else if (Args.hasArg(OPT_fobjc_arc)) {
1748       Opts.ObjCAutoRefCount = 1;
1749       if (!Opts.ObjCRuntime.allowsARC())
1750         Diags.Report(diag::err_arc_unsupported_on_runtime);
1751     }
1752 
1753     // ObjCWeakRuntime tracks whether the runtime supports __weak, not
1754     // whether the feature is actually enabled.  This is predominantly
1755     // determined by -fobjc-runtime, but we allow it to be overridden
1756     // from the command line for testing purposes.
1757     if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1758       Opts.ObjCWeakRuntime = 1;
1759     else
1760       Opts.ObjCWeakRuntime = Opts.ObjCRuntime.allowsWeak();
1761 
1762     // ObjCWeak determines whether __weak is actually enabled.
1763     // Note that we allow -fno-objc-weak to disable this even in ARC mode.
1764     if (auto weakArg = Args.getLastArg(OPT_fobjc_weak, OPT_fno_objc_weak)) {
1765       if (!weakArg->getOption().matches(OPT_fobjc_weak)) {
1766         assert(!Opts.ObjCWeak);
1767       } else if (Opts.getGC() != LangOptions::NonGC) {
1768         Diags.Report(diag::err_objc_weak_with_gc);
1769       } else if (!Opts.ObjCWeakRuntime) {
1770         Diags.Report(diag::err_objc_weak_unsupported);
1771       } else {
1772         Opts.ObjCWeak = 1;
1773       }
1774     } else if (Opts.ObjCAutoRefCount) {
1775       Opts.ObjCWeak = Opts.ObjCWeakRuntime;
1776     }
1777 
1778     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1779       Opts.ObjCInferRelatedResultType = 0;
1780 
1781     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1782       Opts.ObjCSubscriptingLegacyRuntime =
1783         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1784   }
1785 
1786   if (Args.hasArg(OPT_fgnu89_inline)) {
1787     if (Opts.CPlusPlus)
1788       Diags.Report(diag::err_drv_argument_not_allowed_with) << "-fgnu89-inline"
1789                                                             << "C++/ObjC++";
1790     else
1791       Opts.GNUInline = 1;
1792   }
1793 
1794   if (Args.hasArg(OPT_fapple_kext)) {
1795     if (!Opts.CPlusPlus)
1796       Diags.Report(diag::warn_c_kext);
1797     else
1798       Opts.AppleKext = 1;
1799   }
1800 
1801   if (Args.hasArg(OPT_print_ivar_layout))
1802     Opts.ObjCGCBitmapPrint = 1;
1803   if (Args.hasArg(OPT_fno_constant_cfstrings))
1804     Opts.NoConstantCFStrings = 1;
1805 
1806   if (Args.hasArg(OPT_faltivec))
1807     Opts.AltiVec = 1;
1808 
1809   if (Args.hasArg(OPT_fzvector))
1810     Opts.ZVector = 1;
1811 
1812   if (Args.hasArg(OPT_pthread))
1813     Opts.POSIXThreads = 1;
1814 
1815   // The value-visibility mode defaults to "default".
1816   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1817     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1818   } else {
1819     Opts.setValueVisibilityMode(DefaultVisibility);
1820   }
1821 
1822   // The type-visibility mode defaults to the value-visibility mode.
1823   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1824     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1825   } else {
1826     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1827   }
1828 
1829   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1830     Opts.InlineVisibilityHidden = 1;
1831 
1832   if (Args.hasArg(OPT_ftrapv)) {
1833     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1834     // Set the handler, if one is specified.
1835     Opts.OverflowHandler =
1836         Args.getLastArgValue(OPT_ftrapv_handler);
1837   }
1838   else if (Args.hasArg(OPT_fwrapv))
1839     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1840 
1841   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1842   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1843   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1844   Opts.MSCompatibilityVersion = 0;
1845   if (const Arg *A = Args.getLastArg(OPT_fms_compatibility_version)) {
1846     VersionTuple VT;
1847     if (VT.tryParse(A->getValue()))
1848       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
1849                                                 << A->getValue();
1850     Opts.MSCompatibilityVersion = VT.getMajor() * 10000000 +
1851                                   VT.getMinor().getValueOr(0) * 100000 +
1852                                   VT.getSubminor().getValueOr(0);
1853   }
1854 
1855   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1856   // is specified, or -std is set to a conforming mode.
1857   // Trigraphs are disabled by default in c++1z onwards.
1858   Opts.Trigraphs = !Opts.GNUMode && !Opts.MSVCCompat && !Opts.CPlusPlus1z;
1859   Opts.Trigraphs =
1860       Args.hasFlag(OPT_ftrigraphs, OPT_fno_trigraphs, Opts.Trigraphs);
1861 
1862   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1863                                    OPT_fno_dollars_in_identifiers,
1864                                    Opts.DollarIdents);
1865   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1866   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1867   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1868   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1869   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1870                                    Opts.ConstStrings);
1871   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1872     Opts.LaxVectorConversions = 0;
1873   if (Args.hasArg(OPT_fno_threadsafe_statics))
1874     Opts.ThreadsafeStatics = 0;
1875   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1876   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1877   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1878   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1879   Opts.ExternCNoUnwind = Args.hasArg(OPT_fexternc_nounwind);
1880   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1881 
1882   Opts.RTTI = Opts.CPlusPlus && !Args.hasArg(OPT_fno_rtti);
1883   Opts.RTTIData = Opts.RTTI && !Args.hasArg(OPT_fno_rtti_data);
1884   Opts.Blocks = Args.hasArg(OPT_fblocks) || (Opts.OpenCL
1885     && Opts.OpenCLVersion >= 200);
1886   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1887   Opts.Coroutines = Args.hasArg(OPT_fcoroutines);
1888   Opts.ModulesTS = Args.hasArg(OPT_fmodules_ts);
1889   Opts.Modules = Args.hasArg(OPT_fmodules) || Opts.ModulesTS;
1890   Opts.ModulesStrictDeclUse = Args.hasArg(OPT_fmodules_strict_decluse);
1891   Opts.ModulesDeclUse =
1892       Args.hasArg(OPT_fmodules_decluse) || Opts.ModulesStrictDeclUse;
1893   Opts.ModulesLocalVisibility =
1894       Args.hasArg(OPT_fmodules_local_submodule_visibility) || Opts.ModulesTS;
1895   Opts.ModulesSearchAll = Opts.Modules &&
1896     !Args.hasArg(OPT_fno_modules_search_all) &&
1897     Args.hasArg(OPT_fmodules_search_all);
1898   Opts.ModulesErrorRecovery = !Args.hasArg(OPT_fno_modules_error_recovery);
1899   Opts.ImplicitModules = !Args.hasArg(OPT_fno_implicit_modules);
1900   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1901   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1902   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1903   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1904   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1905   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1906   if (!Opts.NoBuiltin)
1907     getAllNoBuiltinFuncValues(Args, Opts.NoBuiltinFuncs);
1908   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1909   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1910   Opts.ConceptsTS = Args.hasArg(OPT_fconcepts_ts);
1911   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1912   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1913   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1914   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1915   Opts.InstantiationDepth =
1916       getLastArgIntValue(Args, OPT_ftemplate_depth, 1024, Diags);
1917   Opts.ArrowDepth =
1918       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1919   Opts.ConstexprCallDepth =
1920       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1921   Opts.ConstexprStepLimit =
1922       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1923   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1924   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1925   Opts.NumLargeByValueCopy =
1926       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1927   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1928   Opts.ObjCConstantStringClass =
1929     Args.getLastArgValue(OPT_fconstant_string_class);
1930   Opts.ObjCDefaultSynthProperties =
1931     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1932   Opts.EncodeExtendedBlockSig =
1933     Args.hasArg(OPT_fencode_extended_block_signature);
1934   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1935   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1936   Opts.MaxTypeAlign = getLastArgIntValue(Args, OPT_fmax_type_align_EQ, 0, Diags);
1937   Opts.AlignDouble = Args.hasArg(OPT_malign_double);
1938   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1939   Opts.PIE = Args.hasArg(OPT_pic_is_pie);
1940   Opts.Static = Args.hasArg(OPT_static_define);
1941   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1942   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1943                         || Args.hasArg(OPT_fdump_record_layouts);
1944   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1945   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1946   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1947   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1948   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1949   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1950   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1951   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1952   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1953   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1954   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1955   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1956   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name_EQ);
1957   Opts.AppExt = Args.hasArg(OPT_fapplication_extension);
1958   Opts.ModuleFeatures = Args.getAllArgValues(OPT_fmodule_feature);
1959   std::sort(Opts.ModuleFeatures.begin(), Opts.ModuleFeatures.end());
1960   Opts.NativeHalfType |= Args.hasArg(OPT_fnative_half_type);
1961   Opts.NativeHalfArgsAndReturns |= Args.hasArg(OPT_fnative_half_arguments_and_returns);
1962   // Enable HalfArgsAndReturns if present in Args or if NativeHalfArgsAndReturns
1963   // is enabled.
1964   Opts.HalfArgsAndReturns = Args.hasArg(OPT_fallow_half_arguments_and_returns)
1965                             | Opts.NativeHalfArgsAndReturns;
1966   Opts.GNUAsm = !Args.hasArg(OPT_fno_gnu_inline_asm);
1967 
1968   // __declspec is enabled by default for the PS4 by the driver, and also
1969   // enabled for Microsoft Extensions or Borland Extensions, here.
1970   //
1971   // FIXME: __declspec is also currently enabled for CUDA, but isn't really a
1972   // CUDA extension, however it is required for supporting cuda_builtin_vars.h,
1973   // which uses __declspec(property). Once that has been rewritten in terms of
1974   // something more generic, remove the Opts.CUDA term here.
1975   Opts.DeclSpecKeyword =
1976       Args.hasFlag(OPT_fdeclspec, OPT_fno_declspec,
1977                    (Opts.MicrosoftExt || Opts.Borland || Opts.CUDA));
1978 
1979   // For now, we only support local submodule visibility in C++ (because we
1980   // heavily depend on the ODR for merging redefinitions).
1981   if (Opts.ModulesLocalVisibility && !Opts.CPlusPlus)
1982     Diags.Report(diag::err_drv_argument_not_allowed_with)
1983         << "-fmodules-local-submodule-visibility" << "C";
1984 
1985   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1986     switch (llvm::StringSwitch<unsigned>(A->getValue())
1987       .Case("target", LangOptions::ASMM_Target)
1988       .Case("no", LangOptions::ASMM_Off)
1989       .Case("yes", LangOptions::ASMM_On)
1990       .Default(255)) {
1991     default:
1992       Diags.Report(diag::err_drv_invalid_value)
1993         << "-faddress-space-map-mangling=" << A->getValue();
1994       break;
1995     case LangOptions::ASMM_Target:
1996       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1997       break;
1998     case LangOptions::ASMM_On:
1999       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
2000       break;
2001     case LangOptions::ASMM_Off:
2002       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
2003       break;
2004     }
2005   }
2006 
2007   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
2008     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
2009         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
2010             A->getValue())
2011             .Case("single",
2012                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
2013             .Case("multiple",
2014                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
2015             .Case("virtual",
2016                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
2017             .Default(LangOptions::PPTMK_BestCase);
2018     if (InheritanceModel == LangOptions::PPTMK_BestCase)
2019       Diags.Report(diag::err_drv_invalid_value)
2020           << "-fms-memptr-rep=" << A->getValue();
2021 
2022     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
2023   }
2024 
2025   // Check for MS default calling conventions being specified.
2026   if (Arg *A = Args.getLastArg(OPT_fdefault_calling_conv_EQ)) {
2027     LangOptions::DefaultCallingConvention DefaultCC =
2028         llvm::StringSwitch<LangOptions::DefaultCallingConvention>(
2029             A->getValue())
2030             .Case("cdecl", LangOptions::DCC_CDecl)
2031             .Case("fastcall", LangOptions::DCC_FastCall)
2032             .Case("stdcall", LangOptions::DCC_StdCall)
2033             .Case("vectorcall", LangOptions::DCC_VectorCall)
2034             .Default(LangOptions::DCC_None);
2035     if (DefaultCC == LangOptions::DCC_None)
2036       Diags.Report(diag::err_drv_invalid_value)
2037           << "-fdefault-calling-conv=" << A->getValue();
2038 
2039     llvm::Triple T(TargetOpts.Triple);
2040     llvm::Triple::ArchType Arch = T.getArch();
2041     bool emitError = (DefaultCC == LangOptions::DCC_FastCall ||
2042                   DefaultCC == LangOptions::DCC_StdCall) &&
2043                  Arch != llvm::Triple::x86;
2044     emitError |= DefaultCC == LangOptions::DCC_VectorCall &&
2045                  !(Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64);
2046     if (emitError)
2047       Diags.Report(diag::err_drv_argument_not_allowed_with)
2048           << A->getSpelling() << T.getTriple();
2049     else
2050       Opts.setDefaultCallingConv(DefaultCC);
2051   }
2052 
2053   // -mrtd option
2054   if (Arg *A = Args.getLastArg(OPT_mrtd)) {
2055     if (Opts.getDefaultCallingConv() != LangOptions::DCC_None)
2056       Diags.Report(diag::err_drv_argument_not_allowed_with)
2057           << A->getSpelling() << "-fdefault-calling-conv";
2058     else {
2059       llvm::Triple T(TargetOpts.Triple);
2060       if (T.getArch() != llvm::Triple::x86)
2061         Diags.Report(diag::err_drv_argument_not_allowed_with)
2062             << A->getSpelling() << T.getTriple();
2063       else
2064         Opts.setDefaultCallingConv(LangOptions::DCC_StdCall);
2065     }
2066   }
2067 
2068   // Check if -fopenmp is specified.
2069   Opts.OpenMP = Args.hasArg(options::OPT_fopenmp) ? 1 : 0;
2070   Opts.OpenMPUseTLS =
2071       Opts.OpenMP && !Args.hasArg(options::OPT_fnoopenmp_use_tls);
2072   Opts.OpenMPIsDevice =
2073       Opts.OpenMP && Args.hasArg(options::OPT_fopenmp_is_device);
2074 
2075   if (Opts.OpenMP) {
2076     int Version =
2077         getLastArgIntValue(Args, OPT_fopenmp_version_EQ, Opts.OpenMP, Diags);
2078     if (Version != 0)
2079       Opts.OpenMP = Version;
2080     // Provide diagnostic when a given target is not expected to be an OpenMP
2081     // device or host.
2082     if (!Opts.OpenMPIsDevice) {
2083       switch (T.getArch()) {
2084       default:
2085         break;
2086       // Add unsupported host targets here:
2087       case llvm::Triple::nvptx:
2088       case llvm::Triple::nvptx64:
2089         Diags.Report(clang::diag::err_drv_omp_host_target_not_supported)
2090             << TargetOpts.Triple;
2091         break;
2092       }
2093     }
2094   }
2095 
2096   // Get the OpenMP target triples if any.
2097   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_targets_EQ)) {
2098 
2099     for (unsigned i = 0; i < A->getNumValues(); ++i) {
2100       llvm::Triple TT(A->getValue(i));
2101 
2102       if (TT.getArch() == llvm::Triple::UnknownArch)
2103         Diags.Report(clang::diag::err_drv_invalid_omp_target) << A->getValue(i);
2104       else
2105         Opts.OMPTargetTriples.push_back(TT);
2106     }
2107   }
2108 
2109   // Get OpenMP host file path if any and report if a non existent file is
2110   // found
2111   if (Arg *A = Args.getLastArg(options::OPT_fopenmp_host_ir_file_path)) {
2112     Opts.OMPHostIRFile = A->getValue();
2113     if (!llvm::sys::fs::exists(Opts.OMPHostIRFile))
2114       Diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
2115           << Opts.OMPHostIRFile;
2116   }
2117 
2118   // Record whether the __DEPRECATED define was requested.
2119   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
2120                                  OPT_fno_deprecated_macro,
2121                                  Opts.Deprecated);
2122 
2123   // FIXME: Eliminate this dependency.
2124   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
2125        OptSize = getOptimizationLevelSize(Args);
2126   Opts.Optimize = Opt != 0;
2127   Opts.OptimizeSize = OptSize != 0;
2128 
2129   // This is the __NO_INLINE__ define, which just depends on things like the
2130   // optimization level and -fno-inline, not actually whether the backend has
2131   // inlining enabled.
2132   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
2133 
2134   Opts.FastMath = Args.hasArg(OPT_ffast_math) ||
2135       Args.hasArg(OPT_cl_fast_relaxed_math);
2136   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only) ||
2137       Args.hasArg(OPT_cl_finite_math_only) ||
2138       Args.hasArg(OPT_cl_fast_relaxed_math);
2139   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
2140                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
2141                       Args.hasArg(OPT_cl_fast_relaxed_math);
2142 
2143   Opts.RetainCommentsFromSystemHeaders =
2144       Args.hasArg(OPT_fretain_comments_from_system_headers);
2145 
2146   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
2147   switch (SSP) {
2148   default:
2149     Diags.Report(diag::err_drv_invalid_value)
2150       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
2151     break;
2152   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
2153   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
2154   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
2155   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
2156   }
2157 
2158   // Parse -fsanitize= arguments.
2159   parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2160                       Diags, Opts.Sanitize);
2161   // -fsanitize-address-field-padding=N has to be a LangOpt, parse it here.
2162   Opts.SanitizeAddressFieldPadding =
2163       getLastArgIntValue(Args, OPT_fsanitize_address_field_padding, 0, Diags);
2164   Opts.SanitizerBlacklistFiles = Args.getAllArgValues(OPT_fsanitize_blacklist);
2165 }
2166 
2167 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
2168                                   FileManager &FileMgr,
2169                                   DiagnosticsEngine &Diags) {
2170   using namespace options;
2171   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
2172   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
2173   if (const Arg *A = Args.getLastArg(OPT_token_cache))
2174       Opts.TokenCache = A->getValue();
2175   else
2176     Opts.TokenCache = Opts.ImplicitPTHInclude;
2177   Opts.UsePredefines = !Args.hasArg(OPT_undef);
2178   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
2179   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
2180 
2181   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
2182   for (const Arg *A : Args.filtered(OPT_error_on_deserialized_pch_decl))
2183     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
2184 
2185   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
2186     StringRef Value(A->getValue());
2187     size_t Comma = Value.find(',');
2188     unsigned Bytes = 0;
2189     unsigned EndOfLine = 0;
2190 
2191     if (Comma == StringRef::npos ||
2192         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
2193         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
2194       Diags.Report(diag::err_drv_preamble_format);
2195     else {
2196       Opts.PrecompiledPreambleBytes.first = Bytes;
2197       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
2198     }
2199   }
2200 
2201   // Add macros from the command line.
2202   for (const Arg *A : Args.filtered(OPT_D, OPT_U)) {
2203     if (A->getOption().matches(OPT_D))
2204       Opts.addMacroDef(A->getValue());
2205     else
2206       Opts.addMacroUndef(A->getValue());
2207   }
2208 
2209   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
2210 
2211   // Add the ordered list of -includes.
2212   for (const Arg *A : Args.filtered(OPT_include))
2213     Opts.Includes.emplace_back(A->getValue());
2214 
2215   for (const Arg *A : Args.filtered(OPT_chain_include))
2216     Opts.ChainedIncludes.emplace_back(A->getValue());
2217 
2218   for (const Arg *A : Args.filtered(OPT_remap_file)) {
2219     std::pair<StringRef, StringRef> Split = StringRef(A->getValue()).split(';');
2220 
2221     if (Split.second.empty()) {
2222       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
2223       continue;
2224     }
2225 
2226     Opts.addRemappedFile(Split.first, Split.second);
2227   }
2228 
2229   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
2230     StringRef Name = A->getValue();
2231     unsigned Library = llvm::StringSwitch<unsigned>(Name)
2232       .Case("libc++", ARCXX_libcxx)
2233       .Case("libstdc++", ARCXX_libstdcxx)
2234       .Case("none", ARCXX_nolib)
2235       .Default(~0U);
2236     if (Library == ~0U)
2237       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
2238     else
2239       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
2240   }
2241 }
2242 
2243 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
2244                                         ArgList &Args,
2245                                         frontend::ActionKind Action) {
2246   using namespace options;
2247 
2248   switch (Action) {
2249   case frontend::ASTDeclList:
2250   case frontend::ASTDump:
2251   case frontend::ASTPrint:
2252   case frontend::ASTView:
2253   case frontend::EmitAssembly:
2254   case frontend::EmitBC:
2255   case frontend::EmitHTML:
2256   case frontend::EmitLLVM:
2257   case frontend::EmitLLVMOnly:
2258   case frontend::EmitCodeGenOnly:
2259   case frontend::EmitObj:
2260   case frontend::FixIt:
2261   case frontend::GenerateModule:
2262   case frontend::GeneratePCH:
2263   case frontend::GeneratePTH:
2264   case frontend::ParseSyntaxOnly:
2265   case frontend::ModuleFileInfo:
2266   case frontend::VerifyPCH:
2267   case frontend::PluginAction:
2268   case frontend::PrintDeclContext:
2269   case frontend::RewriteObjC:
2270   case frontend::RewriteTest:
2271   case frontend::RunAnalysis:
2272   case frontend::MigrateSource:
2273     Opts.ShowCPP = 0;
2274     break;
2275 
2276   case frontend::DumpRawTokens:
2277   case frontend::DumpTokens:
2278   case frontend::InitOnly:
2279   case frontend::PrintPreamble:
2280   case frontend::PrintPreprocessedInput:
2281   case frontend::RewriteMacros:
2282   case frontend::RunPreprocessorOnly:
2283     Opts.ShowCPP = !Args.hasArg(OPT_dM);
2284     break;
2285   }
2286 
2287   Opts.ShowComments = Args.hasArg(OPT_C);
2288   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
2289   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
2290   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
2291   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
2292   Opts.UseLineDirectives = Args.hasArg(OPT_fuse_line_directives);
2293 }
2294 
2295 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args,
2296                             DiagnosticsEngine &Diags) {
2297   using namespace options;
2298   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
2299   if (Arg *A = Args.getLastArg(OPT_meabi)) {
2300     StringRef Value = A->getValue();
2301     llvm::EABI EABIVersion = llvm::StringSwitch<llvm::EABI>(Value)
2302                                  .Case("default", llvm::EABI::Default)
2303                                  .Case("4", llvm::EABI::EABI4)
2304                                  .Case("5", llvm::EABI::EABI5)
2305                                  .Case("gnu", llvm::EABI::GNU)
2306                                  .Default(llvm::EABI::Unknown);
2307     if (EABIVersion == llvm::EABI::Unknown)
2308       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args)
2309                                                 << Value;
2310     else
2311       Opts.EABIVersion = Value;
2312   }
2313   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
2314   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
2315   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
2316   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
2317   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
2318   Opts.Reciprocals = Args.getAllArgValues(OPT_mrecip_EQ);
2319   // Use the default target triple if unspecified.
2320   if (Opts.Triple.empty())
2321     Opts.Triple = llvm::sys::getDefaultTargetTriple();
2322 }
2323 
2324 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
2325                                         const char *const *ArgBegin,
2326                                         const char *const *ArgEnd,
2327                                         DiagnosticsEngine &Diags) {
2328   bool Success = true;
2329 
2330   // Parse the arguments.
2331   std::unique_ptr<OptTable> Opts(createDriverOptTable());
2332   const unsigned IncludedFlagsBitmask = options::CC1Option;
2333   unsigned MissingArgIndex, MissingArgCount;
2334   InputArgList Args =
2335       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
2336                       MissingArgCount, IncludedFlagsBitmask);
2337   LangOptions &LangOpts = *Res.getLangOpts();
2338 
2339   // Check for missing argument error.
2340   if (MissingArgCount) {
2341     Diags.Report(diag::err_drv_missing_argument)
2342         << Args.getArgString(MissingArgIndex) << MissingArgCount;
2343     Success = false;
2344   }
2345 
2346   // Issue errors on unknown arguments.
2347   for (const Arg *A : Args.filtered(OPT_UNKNOWN)) {
2348     Diags.Report(diag::err_drv_unknown_argument) << A->getAsString(Args);
2349     Success = false;
2350   }
2351 
2352   Success &= ParseAnalyzerArgs(*Res.getAnalyzerOpts(), Args, Diags);
2353   Success &= ParseMigratorArgs(Res.getMigratorOpts(), Args);
2354   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), Args);
2355   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
2356                                  false /*DefaultDiagColor*/);
2357   ParseCommentArgs(LangOpts.CommentOpts, Args);
2358   ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
2359   // FIXME: We shouldn't have to pass the DashX option around here
2360   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags);
2361   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
2362   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
2363                               Res.getTargetOpts());
2364   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args);
2365   if (DashX == IK_AST || DashX == IK_LLVM_IR) {
2366     // ObjCAAutoRefCount and Sanitize LangOpts are used to setup the
2367     // PassManager in BackendUtil.cpp. They need to be initializd no matter
2368     // what the input type is.
2369     if (Args.hasArg(OPT_fobjc_arc))
2370       LangOpts.ObjCAutoRefCount = 1;
2371     // PIClevel and PIELevel are needed during code generation and this should be
2372     // set regardless of the input type.
2373     LangOpts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
2374     LangOpts.PIE = Args.hasArg(OPT_pic_is_pie);
2375     parseSanitizerKinds("-fsanitize=", Args.getAllArgValues(OPT_fsanitize_EQ),
2376                         Diags, LangOpts.Sanitize);
2377   } else {
2378     // Other LangOpts are only initialzed when the input is not AST or LLVM IR.
2379     ParseLangArgs(LangOpts, Args, DashX, Res.getTargetOpts(),
2380       Res.getPreprocessorOpts(), Diags);
2381     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
2382       LangOpts.ObjCExceptions = 1;
2383   }
2384 
2385   if (LangOpts.CUDA) {
2386     // During CUDA device-side compilation, the aux triple is the
2387     // triple used for host compilation.
2388     if (LangOpts.CUDAIsDevice)
2389       Res.getTargetOpts().HostTriple = Res.getFrontendOpts().AuxTriple;
2390 
2391     // Set default FP_CONTRACT to FAST.
2392     if (!Args.hasArg(OPT_ffp_contract))
2393       Res.getCodeGenOpts().setFPContractMode(CodeGenOptions::FPC_Fast);
2394   }
2395 
2396   // FIXME: Override value name discarding when asan or msan is used because the
2397   // backend passes depend on the name of the alloca in order to print out
2398   // names.
2399   Res.getCodeGenOpts().DiscardValueNames &=
2400       !LangOpts.Sanitize.has(SanitizerKind::Address) &&
2401       !LangOpts.Sanitize.has(SanitizerKind::Memory);
2402 
2403   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
2404   // PCH file and find the original header name. Remove the need to do that in
2405   // ParsePreprocessorArgs and remove the FileManager
2406   // parameters from the function and the "FileManager.h" #include.
2407   FileManager FileMgr(Res.getFileSystemOpts());
2408   ParsePreprocessorArgs(Res.getPreprocessorOpts(), Args, FileMgr, Diags);
2409   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), Args,
2410                               Res.getFrontendOpts().ProgramAction);
2411 
2412   // Turn on -Wspir-compat for SPIR target.
2413   llvm::Triple T(Res.getTargetOpts().Triple);
2414   auto Arch = T.getArch();
2415   if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) {
2416     Res.getDiagnosticOpts().Warnings.push_back("spir-compat");
2417   }
2418   return Success;
2419 }
2420 
2421 std::string CompilerInvocation::getModuleHash() const {
2422   // Note: For QoI reasons, the things we use as a hash here should all be
2423   // dumped via the -module-info flag.
2424   using llvm::hash_code;
2425   using llvm::hash_value;
2426   using llvm::hash_combine;
2427 
2428   // Start the signature with the compiler version.
2429   // FIXME: We'd rather use something more cryptographically sound than
2430   // CityHash, but this will do for now.
2431   hash_code code = hash_value(getClangFullRepositoryVersion());
2432 
2433   // Extend the signature with the language options
2434 #define LANGOPT(Name, Bits, Default, Description) \
2435    code = hash_combine(code, LangOpts->Name);
2436 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
2437   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
2438 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
2439 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
2440 #include "clang/Basic/LangOptions.def"
2441 
2442   for (StringRef Feature : LangOpts->ModuleFeatures)
2443     code = hash_combine(code, Feature);
2444 
2445   // Extend the signature with the target options.
2446   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
2447                       TargetOpts->ABI);
2448   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
2449     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
2450 
2451   // Extend the signature with preprocessor options.
2452   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
2453   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
2454   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
2455 
2456   for (std::vector<std::pair<std::string, bool/*isUndef*/>>::const_iterator
2457             I = getPreprocessorOpts().Macros.begin(),
2458          IEnd = getPreprocessorOpts().Macros.end();
2459        I != IEnd; ++I) {
2460     // If we're supposed to ignore this macro for the purposes of modules,
2461     // don't put it into the hash.
2462     if (!hsOpts.ModulesIgnoreMacros.empty()) {
2463       // Check whether we're ignoring this macro.
2464       StringRef MacroDef = I->first;
2465       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
2466         continue;
2467     }
2468 
2469     code = hash_combine(code, I->first, I->second);
2470   }
2471 
2472   // Extend the signature with the sysroot and other header search options.
2473   code = hash_combine(code, hsOpts.Sysroot,
2474                       hsOpts.ModuleFormat,
2475                       hsOpts.UseDebugInfo,
2476                       hsOpts.UseBuiltinIncludes,
2477                       hsOpts.UseStandardSystemIncludes,
2478                       hsOpts.UseStandardCXXIncludes,
2479                       hsOpts.UseLibcxx,
2480                       hsOpts.ModulesValidateDiagnosticOptions);
2481   code = hash_combine(code, hsOpts.ResourceDir);
2482 
2483   // Extend the signature with the user build path.
2484   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
2485 
2486   // Extend the signature with the module file extensions.
2487   const FrontendOptions &frontendOpts = getFrontendOpts();
2488   for (const auto &ext : frontendOpts.ModuleFileExtensions) {
2489     code = ext->hashExtension(code);
2490   }
2491 
2492   // Darwin-specific hack: if we have a sysroot, use the contents and
2493   // modification time of
2494   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
2495   // as part of the module hash.
2496   if (!hsOpts.Sysroot.empty()) {
2497     SmallString<128> systemVersionFile;
2498     systemVersionFile += hsOpts.Sysroot;
2499     llvm::sys::path::append(systemVersionFile, "System");
2500     llvm::sys::path::append(systemVersionFile, "Library");
2501     llvm::sys::path::append(systemVersionFile, "CoreServices");
2502     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
2503 
2504     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> buffer =
2505         llvm::MemoryBuffer::getFile(systemVersionFile);
2506     if (buffer) {
2507       code = hash_combine(code, buffer.get()->getBuffer());
2508 
2509       struct stat statBuf;
2510       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
2511         code = hash_combine(code, statBuf.st_mtime);
2512     }
2513   }
2514 
2515   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
2516 }
2517 
2518 namespace clang {
2519 
2520 template<typename IntTy>
2521 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
2522                                     IntTy Default,
2523                                     DiagnosticsEngine *Diags) {
2524   IntTy Res = Default;
2525   if (Arg *A = Args.getLastArg(Id)) {
2526     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
2527       if (Diags)
2528         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
2529                                                        << A->getValue();
2530     }
2531   }
2532   return Res;
2533 }
2534 
2535 
2536 // Declared in clang/Frontend/Utils.h.
2537 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
2538                        DiagnosticsEngine *Diags) {
2539   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
2540 }
2541 
2542 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
2543                                uint64_t Default,
2544                                DiagnosticsEngine *Diags) {
2545   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
2546 }
2547 
2548 void BuryPointer(const void *Ptr) {
2549   // This function may be called only a small fixed amount of times per each
2550   // invocation, otherwise we do actually have a leak which we want to report.
2551   // If this function is called more than kGraveYardMaxSize times, the pointers
2552   // will not be properly buried and a leak detector will report a leak, which
2553   // is what we want in such case.
2554   static const size_t kGraveYardMaxSize = 16;
2555   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
2556   static std::atomic<unsigned> GraveYardSize;
2557   unsigned Idx = GraveYardSize++;
2558   if (Idx >= kGraveYardMaxSize)
2559     return;
2560   GraveYard[Idx] = Ptr;
2561 }
2562 
2563 IntrusiveRefCntPtr<vfs::FileSystem>
2564 createVFSFromCompilerInvocation(const CompilerInvocation &CI,
2565                                 DiagnosticsEngine &Diags) {
2566   if (CI.getHeaderSearchOpts().VFSOverlayFiles.empty())
2567     return vfs::getRealFileSystem();
2568 
2569   IntrusiveRefCntPtr<vfs::OverlayFileSystem>
2570     Overlay(new vfs::OverlayFileSystem(vfs::getRealFileSystem()));
2571   // earlier vfs files are on the bottom
2572   for (const std::string &File : CI.getHeaderSearchOpts().VFSOverlayFiles) {
2573     llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> Buffer =
2574         llvm::MemoryBuffer::getFile(File);
2575     if (!Buffer) {
2576       Diags.Report(diag::err_missing_vfs_overlay_file) << File;
2577       return IntrusiveRefCntPtr<vfs::FileSystem>();
2578     }
2579 
2580     IntrusiveRefCntPtr<vfs::FileSystem> FS = vfs::getVFSFromYAML(
2581         std::move(Buffer.get()), /*DiagHandler*/ nullptr, File);
2582     if (!FS.get()) {
2583       Diags.Report(diag::err_invalid_vfs_overlay) << File;
2584       return IntrusiveRefCntPtr<vfs::FileSystem>();
2585     }
2586     Overlay->pushOverlay(FS);
2587   }
2588   return Overlay;
2589 }
2590 } // end namespace clang
2591