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