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