1 //===--- CompilerInvocation.cpp -------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/Frontend/CompilerInvocation.h"
11 #include "clang/Basic/Diagnostic.h"
12 #include "clang/Basic/FileManager.h"
13 #include "clang/Basic/Version.h"
14 #include "clang/Driver/DriverDiagnostic.h"
15 #include "clang/Driver/Options.h"
16 #include "clang/Driver/Util.h"
17 #include "clang/Frontend/LangStandard.h"
18 #include "clang/Frontend/Utils.h"
19 #include "clang/Lex/HeaderSearchOptions.h"
20 #include "clang/Serialization/ASTReader.h"
21 #include "llvm/ADT/Hashing.h"
22 #include "llvm/ADT/OwningPtr.h"
23 #include "llvm/ADT/SmallVector.h"
24 #include "llvm/ADT/StringExtras.h"
25 #include "llvm/ADT/StringSwitch.h"
26 #include "llvm/ADT/Triple.h"
27 #include "llvm/Option/Arg.h"
28 #include "llvm/Option/ArgList.h"
29 #include "llvm/Option/OptTable.h"
30 #include "llvm/Option/Option.h"
31 #include "llvm/Support/Atomic.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/FileSystem.h"
34 #include "llvm/Support/Host.h"
35 #include "llvm/Support/Path.h"
36 #include "llvm/Support/Process.h"
37 #include "llvm/Support/system_error.h"
38 #include <sys/stat.h>
39 using namespace clang;
40 
41 //===----------------------------------------------------------------------===//
42 // Initialization.
43 //===----------------------------------------------------------------------===//
44 
45 CompilerInvocationBase::CompilerInvocationBase()
46   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
47     DiagnosticOpts(new DiagnosticOptions()),
48     HeaderSearchOpts(new HeaderSearchOptions()),
49     PreprocessorOpts(new PreprocessorOptions()) {}
50 
51 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
52   : RefCountedBase<CompilerInvocation>(),
53     LangOpts(new LangOptions(*X.getLangOpts())),
54     TargetOpts(new TargetOptions(X.getTargetOpts())),
55     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
56     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
57     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
58 
59 //===----------------------------------------------------------------------===//
60 // Deserialization (from args)
61 //===----------------------------------------------------------------------===//
62 
63 using namespace clang::driver;
64 using namespace clang::driver::options;
65 using namespace llvm::opt;
66 
67 //
68 
69 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
70                                      DiagnosticsEngine &Diags) {
71   unsigned DefaultOpt = 0;
72   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
73     DefaultOpt = 2;
74 
75   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
76     if (A->getOption().matches(options::OPT_O0))
77       return 0;
78 
79     if (A->getOption().matches(options::OPT_Ofast))
80       return 3;
81 
82     assert (A->getOption().matches(options::OPT_O));
83 
84     StringRef S(A->getValue());
85     if (S == "s" || S == "z" || S.empty())
86       return 2;
87 
88     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
89   }
90 
91   return DefaultOpt;
92 }
93 
94 static unsigned getOptimizationLevelSize(ArgList &Args) {
95   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
96     if (A->getOption().matches(options::OPT_O)) {
97       switch (A->getValue()[0]) {
98       default:
99         return 0;
100       case 's':
101         return 1;
102       case 'z':
103         return 2;
104       }
105     }
106   }
107   return 0;
108 }
109 
110 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
111   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
112          E = Args.filtered_end(); I != E; ++I) {
113     Arg *A = *I;
114     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
115     // to the warning list. Else, add its value (for the OPT_W case).
116     if (A->getOption().getKind() == Option::FlagClass) {
117       Warnings.push_back(A->getOption().getName().substr(1));
118     } else {
119       for (unsigned Idx = 0, End = A->getNumValues();
120            Idx < End; ++Idx) {
121         StringRef V = A->getValue(Idx);
122         // "-Wl," and such are not warning options.
123         // FIXME: Should be handled by putting these in separate flags.
124         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
125           continue;
126 
127         Warnings.push_back(V);
128       }
129     }
130   }
131 }
132 
133 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
134                               DiagnosticsEngine &Diags) {
135   using namespace options;
136   bool Success = true;
137   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
138     StringRef Name = A->getValue();
139     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
140 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
141       .Case(CMDFLAG, NAME##Model)
142 #include "clang/StaticAnalyzer/Core/Analyses.def"
143       .Default(NumStores);
144     if (Value == NumStores) {
145       Diags.Report(diag::err_drv_invalid_value)
146         << A->getAsString(Args) << Name;
147       Success = false;
148     } else {
149       Opts.AnalysisStoreOpt = Value;
150     }
151   }
152 
153   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
154     StringRef Name = A->getValue();
155     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
156 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
157       .Case(CMDFLAG, NAME##Model)
158 #include "clang/StaticAnalyzer/Core/Analyses.def"
159       .Default(NumConstraints);
160     if (Value == NumConstraints) {
161       Diags.Report(diag::err_drv_invalid_value)
162         << A->getAsString(Args) << Name;
163       Success = false;
164     } else {
165       Opts.AnalysisConstraintsOpt = Value;
166     }
167   }
168 
169   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
170     StringRef Name = A->getValue();
171     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
172 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
173       .Case(CMDFLAG, PD_##NAME)
174 #include "clang/StaticAnalyzer/Core/Analyses.def"
175       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
176     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
177       Diags.Report(diag::err_drv_invalid_value)
178         << A->getAsString(Args) << Name;
179       Success = false;
180     } else {
181       Opts.AnalysisDiagOpt = Value;
182     }
183   }
184 
185   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
186     StringRef Name = A->getValue();
187     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
188 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
189       .Case(CMDFLAG, NAME)
190 #include "clang/StaticAnalyzer/Core/Analyses.def"
191       .Default(NumPurgeModes);
192     if (Value == NumPurgeModes) {
193       Diags.Report(diag::err_drv_invalid_value)
194         << A->getAsString(Args) << Name;
195       Success = false;
196     } else {
197       Opts.AnalysisPurgeOpt = Value;
198     }
199   }
200 
201   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
202     StringRef Name = A->getValue();
203     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
204 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
205       .Case(CMDFLAG, NAME)
206 #include "clang/StaticAnalyzer/Core/Analyses.def"
207       .Default(NumInliningModes);
208     if (Value == NumInliningModes) {
209       Diags.Report(diag::err_drv_invalid_value)
210         << A->getAsString(Args) << Name;
211       Success = false;
212     } else {
213       Opts.InliningMode = Value;
214     }
215   }
216 
217   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
218   Opts.visualizeExplodedGraphWithGraphViz =
219     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
220   Opts.visualizeExplodedGraphWithUbiGraph =
221     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
222   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
223   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
224   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
225   Opts.AnalyzeNestedBlocks =
226     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
227   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
228   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
229   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
230   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
231   Opts.maxBlockVisitOnPath =
232       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
233   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
234   Opts.InlineMaxStackDepth =
235       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
236                          Opts.InlineMaxStackDepth, Diags);
237 
238   Opts.CheckersControlList.clear();
239   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
240                                              OPT_analyzer_disable_checker),
241          ie = Args.filtered_end(); it != ie; ++it) {
242     const Arg *A = *it;
243     A->claim();
244     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
245     // We can have a list of comma separated checker names, e.g:
246     // '-analyzer-checker=cocoa,unix'
247     StringRef checkerList = A->getValue();
248     SmallVector<StringRef, 4> checkers;
249     checkerList.split(checkers, ",");
250     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
251       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
252   }
253 
254   // Go through the analyzer configuration options.
255   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
256        ie = Args.filtered_end(); it != ie; ++it) {
257     const Arg *A = *it;
258     A->claim();
259     // We can have a list of comma separated config names, e.g:
260     // '-analyzer-config key1=val1,key2=val2'
261     StringRef configList = A->getValue();
262     SmallVector<StringRef, 4> configVals;
263     configList.split(configVals, ",");
264     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
265       StringRef key, val;
266       llvm::tie(key, val) = configVals[i].split("=");
267       if (val.empty()) {
268         Diags.Report(SourceLocation(),
269                      diag::err_analyzer_config_no_value) << configVals[i];
270         Success = false;
271         break;
272       }
273       if (val.find('=') != StringRef::npos) {
274         Diags.Report(SourceLocation(),
275                      diag::err_analyzer_config_multiple_values)
276           << configVals[i];
277         Success = false;
278         break;
279       }
280       Opts.Config[key] = val;
281     }
282   }
283 
284   return Success;
285 }
286 
287 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
288   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
289   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
290   return true;
291 }
292 
293 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
294   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
295   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
296 }
297 
298 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
299                              DiagnosticsEngine &Diags,
300                              const TargetOptions &TargetOpts) {
301   using namespace options;
302   bool Success = true;
303 
304   Opts.OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
305   // TODO: This could be done in Driver
306   unsigned MaxOptLevel = 3;
307   if (Opts.OptimizationLevel > MaxOptLevel) {
308     // If the optimization level is not supported, fall back on the default optimization
309     Diags.Report(diag::warn_drv_optimization_value)
310         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
311     Opts.OptimizationLevel = MaxOptLevel;
312   }
313 
314   // We must always run at least the always inlining pass.
315   Opts.setInlining(
316     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
317                                  : CodeGenOptions::OnlyAlwaysInlining);
318   // -fno-inline-functions overrides OptimizationLevel > 1.
319   Opts.NoInline = Args.hasArg(OPT_fno_inline);
320   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
321                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
322 
323   if (Args.hasArg(OPT_gline_tables_only)) {
324     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
325   } else if (Args.hasArg(OPT_g_Flag) || Args.hasArg(OPT_gdwarf_2) ||
326              Args.hasArg(OPT_gdwarf_3) || Args.hasArg(OPT_gdwarf_4)) {
327     bool Default = false;
328     // Until dtrace (via CTF) can deal with distributed debug info,
329     // Darwin defaults to standalone/full debug info.
330     if (llvm::Triple(TargetOpts.Triple).isOSDarwin())
331       Default = true;
332 
333     if (Args.hasFlag(OPT_fstandalone_debug, OPT_fno_standalone_debug, Default))
334       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
335     else
336       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
337   }
338   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
339   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
340   if (Args.hasArg(OPT_gdwarf_2))
341     Opts.DwarfVersion = 2;
342   else if (Args.hasArg(OPT_gdwarf_3))
343     Opts.DwarfVersion = 3;
344   else if (Args.hasArg(OPT_gdwarf_4))
345     Opts.DwarfVersion = 4;
346   else if (Opts.getDebugInfo() != CodeGenOptions::NoDebugInfo)
347     // Default Dwarf version is 4 if we are generating debug information.
348     Opts.DwarfVersion = 4;
349 
350   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
351   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
352   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
353   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
354     OPT_fuse_register_sized_bitfield_access);
355   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
356   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
357   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
358   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
359   Opts.NoCommon = Args.hasArg(OPT_fno_common);
360   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
361   Opts.OptimizeSize = getOptimizationLevelSize(Args);
362   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
363                             Args.hasArg(OPT_ffreestanding));
364   Opts.UnrollLoops =
365       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
366                    (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize));
367   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
368 
369   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
370   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
371   Opts.ProfileInstrGenerate = Args.hasArg(OPT_fprofile_instr_generate);
372   Opts.InstrProfileInput = Args.getLastArgValue(OPT_fprofile_instr_use_EQ);
373   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
374   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
375   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
376   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
377   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
378   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
379   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
380   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
381   Opts.DisableFree = Args.hasArg(OPT_disable_free);
382   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
383   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
384   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
385   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
386   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
387                        Args.hasArg(OPT_cl_finite_math_only)||
388                        Args.hasArg(OPT_cl_fast_relaxed_math));
389   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
390                        Args.hasArg(OPT_cl_finite_math_only)||
391                        Args.hasArg(OPT_cl_fast_relaxed_math));
392   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
393   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
394   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
395   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
396   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
397   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
398   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
399   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
400   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
401   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
402   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
403   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
404   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
405   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
406                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
407                       Args.hasArg(OPT_cl_fast_relaxed_math);
408   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
409   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
410   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
411   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
412 
413   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
414                                        OPT_fno_function_sections, false);
415   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
416                                    OPT_fno_data_sections, false);
417 
418   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
419   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
420   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
421 
422   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
423   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
424   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
425 
426   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
427   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
428   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
429   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
430   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
431     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
432     Opts.CoverageNoFunctionNamesInData =
433         Args.hasArg(OPT_coverage_no_function_names_in_data);
434     if (Args.hasArg(OPT_coverage_version_EQ)) {
435       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
436       if (CoverageVersion.size() != 4) {
437         Diags.Report(diag::err_drv_invalid_value)
438             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
439             << CoverageVersion;
440       } else {
441         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
442       }
443     }
444   }
445 
446   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
447   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
448   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
449   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
450   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
451   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
452   Opts.SanitizeMemoryTrackOrigins =
453     Args.hasArg(OPT_fsanitize_memory_track_origins);
454   Opts.SanitizeUndefinedTrapOnError =
455     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
456   Opts.SSPBufferSize =
457       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
458   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
459   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
460     StringRef Val = A->getValue();
461     unsigned StackAlignment = Opts.StackAlignment;
462     Val.getAsInteger(10, StackAlignment);
463     Opts.StackAlignment = StackAlignment;
464   }
465 
466   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
467     StringRef Name = A->getValue();
468     unsigned Method = llvm::StringSwitch<unsigned>(Name)
469       .Case("legacy", CodeGenOptions::Legacy)
470       .Case("non-legacy", CodeGenOptions::NonLegacy)
471       .Case("mixed", CodeGenOptions::Mixed)
472       .Default(~0U);
473     if (Method == ~0U) {
474       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
475       Success = false;
476     } else {
477       Opts.setObjCDispatchMethod(
478         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
479     }
480   }
481 
482   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
483     StringRef Name = A->getValue();
484     unsigned Model = llvm::StringSwitch<unsigned>(Name)
485         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
486         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
487         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
488         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
489         .Default(~0U);
490     if (Model == ~0U) {
491       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
492       Success = false;
493     } else {
494       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
495     }
496   }
497 
498   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
499     StringRef Val = A->getValue();
500     if (Val == "fast")
501       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
502     else if (Val == "on")
503       Opts.setFPContractMode(CodeGenOptions::FPC_On);
504     else if (Val == "off")
505       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
506     else
507       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
508   }
509 
510   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
511     if (A->getOption().matches(OPT_fpcc_struct_return)) {
512       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
513     } else {
514       assert(A->getOption().matches(OPT_freg_struct_return));
515       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
516     }
517   }
518 
519   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
520 
521   return Success;
522 }
523 
524 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
525                                       ArgList &Args) {
526   using namespace options;
527   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
528   Opts.Targets = Args.getAllArgValues(OPT_MT);
529   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
530   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
531   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
532   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
533   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
534   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
535   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
536 }
537 
538 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
539                                 DiagnosticsEngine *Diags) {
540   using namespace options;
541   bool Success = true;
542 
543   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
544   Opts.DiagnosticSerializationFile =
545     Args.getLastArgValue(OPT_diagnostic_serialized_file);
546   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
547   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
548   Opts.Pedantic = Args.hasArg(OPT_pedantic);
549   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
550   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
551   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
552   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
553                                  OPT_fno_show_column,
554                                  /*Default=*/true);
555   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
556   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
557   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
558 
559   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
560 
561   // Default behavior is to not to show note include stacks.
562   Opts.ShowNoteIncludeStack = false;
563   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
564                                OPT_fno_diagnostics_show_note_include_stack))
565     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
566       Opts.ShowNoteIncludeStack = true;
567 
568   StringRef ShowOverloads =
569     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
570   if (ShowOverloads == "best")
571     Opts.setShowOverloads(Ovl_Best);
572   else if (ShowOverloads == "all")
573     Opts.setShowOverloads(Ovl_All);
574   else {
575     Success = false;
576     if (Diags)
577       Diags->Report(diag::err_drv_invalid_value)
578       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
579       << ShowOverloads;
580   }
581 
582   StringRef ShowCategory =
583     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
584   if (ShowCategory == "none")
585     Opts.ShowCategories = 0;
586   else if (ShowCategory == "id")
587     Opts.ShowCategories = 1;
588   else if (ShowCategory == "name")
589     Opts.ShowCategories = 2;
590   else {
591     Success = false;
592     if (Diags)
593       Diags->Report(diag::err_drv_invalid_value)
594       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
595       << ShowCategory;
596   }
597 
598   StringRef Format =
599     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
600   if (Format == "clang")
601     Opts.setFormat(DiagnosticOptions::Clang);
602   else if (Format == "msvc")
603     Opts.setFormat(DiagnosticOptions::Msvc);
604   else if (Format == "msvc-fallback") {
605     Opts.setFormat(DiagnosticOptions::Msvc);
606     Opts.CLFallbackMode = true;
607   } else if (Format == "vi")
608     Opts.setFormat(DiagnosticOptions::Vi);
609   else {
610     Success = false;
611     if (Diags)
612       Diags->Report(diag::err_drv_invalid_value)
613       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
614       << Format;
615   }
616 
617   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
618   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
619   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
620   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
621   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
622   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
623   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
624   Opts.MacroBacktraceLimit =
625       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
626                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
627   Opts.TemplateBacktraceLimit = getLastArgIntValue(
628       Args, OPT_ftemplate_backtrace_limit,
629       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
630   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
631       Args, OPT_fconstexpr_backtrace_limit,
632       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
633   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
634                                     DiagnosticOptions::DefaultTabStop, Diags);
635   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
636     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
637     if (Diags)
638       Diags->Report(diag::warn_ignoring_ftabstop_value)
639       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
640   }
641   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
642   addWarningArgs(Args, Opts.Warnings);
643 
644   return Success;
645 }
646 
647 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
648   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
649 }
650 
651 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
652                                    DiagnosticsEngine &Diags) {
653   using namespace options;
654   Opts.ProgramAction = frontend::ParseSyntaxOnly;
655   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
656     switch (A->getOption().getID()) {
657     default:
658       llvm_unreachable("Invalid option in group!");
659     case OPT_ast_list:
660       Opts.ProgramAction = frontend::ASTDeclList; break;
661     case OPT_ast_dump:
662       Opts.ProgramAction = frontend::ASTDump; break;
663     case OPT_ast_print:
664       Opts.ProgramAction = frontend::ASTPrint; break;
665     case OPT_ast_view:
666       Opts.ProgramAction = frontend::ASTView; break;
667     case OPT_dump_raw_tokens:
668       Opts.ProgramAction = frontend::DumpRawTokens; break;
669     case OPT_dump_tokens:
670       Opts.ProgramAction = frontend::DumpTokens; break;
671     case OPT_S:
672       Opts.ProgramAction = frontend::EmitAssembly; break;
673     case OPT_emit_llvm_bc:
674       Opts.ProgramAction = frontend::EmitBC; break;
675     case OPT_emit_html:
676       Opts.ProgramAction = frontend::EmitHTML; break;
677     case OPT_emit_llvm:
678       Opts.ProgramAction = frontend::EmitLLVM; break;
679     case OPT_emit_llvm_only:
680       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
681     case OPT_emit_codegen_only:
682       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
683     case OPT_emit_obj:
684       Opts.ProgramAction = frontend::EmitObj; break;
685     case OPT_fixit_EQ:
686       Opts.FixItSuffix = A->getValue();
687       // fall-through!
688     case OPT_fixit:
689       Opts.ProgramAction = frontend::FixIt; break;
690     case OPT_emit_module:
691       Opts.ProgramAction = frontend::GenerateModule; break;
692     case OPT_emit_pch:
693       Opts.ProgramAction = frontend::GeneratePCH; break;
694     case OPT_emit_pth:
695       Opts.ProgramAction = frontend::GeneratePTH; break;
696     case OPT_init_only:
697       Opts.ProgramAction = frontend::InitOnly; break;
698     case OPT_fsyntax_only:
699       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
700     case OPT_module_file_info:
701       Opts.ProgramAction = frontend::ModuleFileInfo; break;
702     case OPT_verify_pch:
703       Opts.ProgramAction = frontend::VerifyPCH; break;
704     case OPT_print_decl_contexts:
705       Opts.ProgramAction = frontend::PrintDeclContext; break;
706     case OPT_print_preamble:
707       Opts.ProgramAction = frontend::PrintPreamble; break;
708     case OPT_E:
709       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
710     case OPT_rewrite_macros:
711       Opts.ProgramAction = frontend::RewriteMacros; break;
712     case OPT_rewrite_objc:
713       Opts.ProgramAction = frontend::RewriteObjC; break;
714     case OPT_rewrite_test:
715       Opts.ProgramAction = frontend::RewriteTest; break;
716     case OPT_analyze:
717       Opts.ProgramAction = frontend::RunAnalysis; break;
718     case OPT_migrate:
719       Opts.ProgramAction = frontend::MigrateSource; break;
720     case OPT_Eonly:
721       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
722     }
723   }
724 
725   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
726     Opts.Plugins.push_back(A->getValue(0));
727     Opts.ProgramAction = frontend::PluginAction;
728     Opts.ActionName = A->getValue();
729 
730     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
731            end = Args.filtered_end(); it != end; ++it) {
732       if ((*it)->getValue(0) == Opts.ActionName)
733         Opts.PluginArgs.push_back((*it)->getValue(1));
734     }
735   }
736 
737   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
738   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
739   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
740     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
741            end = Args.filtered_end(); it != end; ++it) {
742       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
743         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
744     }
745   }
746 
747   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
748     Opts.CodeCompletionAt =
749       ParsedSourceLocation::FromString(A->getValue());
750     if (Opts.CodeCompletionAt.FileName.empty())
751       Diags.Report(diag::err_drv_invalid_value)
752         << A->getAsString(Args) << A->getValue();
753   }
754   Opts.DisableFree = Args.hasArg(OPT_disable_free);
755 
756   Opts.OutputFile = Args.getLastArgValue(OPT_o);
757   Opts.Plugins = Args.getAllArgValues(OPT_load);
758   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
759   Opts.ShowHelp = Args.hasArg(OPT_help);
760   Opts.ShowStats = Args.hasArg(OPT_print_stats);
761   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
762   Opts.ShowVersion = Args.hasArg(OPT_version);
763   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
764   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
765   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
766   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
767   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
768   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
769   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
770   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
771   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
772   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
773 
774   Opts.CodeCompleteOpts.IncludeMacros
775     = Args.hasArg(OPT_code_completion_macros);
776   Opts.CodeCompleteOpts.IncludeCodePatterns
777     = Args.hasArg(OPT_code_completion_patterns);
778   Opts.CodeCompleteOpts.IncludeGlobals
779     = !Args.hasArg(OPT_no_code_completion_globals);
780   Opts.CodeCompleteOpts.IncludeBriefComments
781     = Args.hasArg(OPT_code_completion_brief_comments);
782 
783   Opts.OverrideRecordLayoutsFile
784     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
785   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
786                                      OPT_arcmt_modify,
787                                      OPT_arcmt_migrate)) {
788     switch (A->getOption().getID()) {
789     default:
790       llvm_unreachable("missed a case");
791     case OPT_arcmt_check:
792       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
793       break;
794     case OPT_arcmt_modify:
795       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
796       break;
797     case OPT_arcmt_migrate:
798       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
799       break;
800     }
801   }
802   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
803   Opts.ARCMTMigrateReportOut
804     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
805   Opts.ARCMTMigrateEmitARCErrors
806     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
807 
808   if (Args.hasArg(OPT_objcmt_migrate_literals))
809     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
810   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
811     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
812   if (Args.hasArg(OPT_objcmt_migrate_property))
813     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
814   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
815     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
816   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
817     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
818   if (Args.hasArg(OPT_objcmt_migrate_annotation))
819     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
820   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
821     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
822   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
823     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
824   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
825     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
826   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
827     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
828   if (Args.hasArg(OPT_objcmt_atomic_property))
829     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
830   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
831     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
832   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
833     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
834   if (Args.hasArg(OPT_objcmt_migrate_all))
835     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
836 
837   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
838 
839   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
840       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
841     Diags.Report(diag::err_drv_argument_not_allowed_with)
842       << "ARC migration" << "ObjC migration";
843   }
844 
845   InputKind DashX = IK_None;
846   if (const Arg *A = Args.getLastArg(OPT_x)) {
847     DashX = llvm::StringSwitch<InputKind>(A->getValue())
848       .Case("c", IK_C)
849       .Case("cl", IK_OpenCL)
850       .Case("cuda", IK_CUDA)
851       .Case("c++", IK_CXX)
852       .Case("objective-c", IK_ObjC)
853       .Case("objective-c++", IK_ObjCXX)
854       .Case("cpp-output", IK_PreprocessedC)
855       .Case("assembler-with-cpp", IK_Asm)
856       .Case("c++-cpp-output", IK_PreprocessedCXX)
857       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
858       .Case("objc-cpp-output", IK_PreprocessedObjC)
859       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
860       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
861       .Case("c-header", IK_C)
862       .Case("cl-header", IK_OpenCL)
863       .Case("objective-c-header", IK_ObjC)
864       .Case("c++-header", IK_CXX)
865       .Case("objective-c++-header", IK_ObjCXX)
866       .Cases("ast", "pcm", IK_AST)
867       .Case("ir", IK_LLVM_IR)
868       .Default(IK_None);
869     if (DashX == IK_None)
870       Diags.Report(diag::err_drv_invalid_value)
871         << A->getAsString(Args) << A->getValue();
872   }
873 
874   // '-' is the default input if none is given.
875   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
876   Opts.Inputs.clear();
877   if (Inputs.empty())
878     Inputs.push_back("-");
879   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
880     InputKind IK = DashX;
881     if (IK == IK_None) {
882       IK = FrontendOptions::getInputKindForExtension(
883         StringRef(Inputs[i]).rsplit('.').second);
884       // FIXME: Remove this hack.
885       if (i == 0)
886         DashX = IK;
887     }
888     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
889   }
890 
891   return DashX;
892 }
893 
894 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
895                                                  void *MainAddr) {
896   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
897 
898   if (!P.empty()) {
899     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
900     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
901 
902     // Get foo/lib/clang/<version>/include
903     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
904   }
905 
906   return P.str();
907 }
908 
909 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
910   using namespace options;
911   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
912   Opts.Verbose = Args.hasArg(OPT_v);
913   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
914   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
915   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
916   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
917     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
918   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
919   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
920   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
921   // -fmodules implies -fmodule-maps
922   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
923   Opts.ModuleCachePruneInterval =
924       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
925   Opts.ModuleCachePruneAfter =
926       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
927   Opts.ModulesValidateOncePerBuildSession =
928       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
929   Opts.BuildSessionTimestamp =
930       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
931   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
932                     ie = Args.filtered_end();
933        it != ie; ++it) {
934     StringRef MacroDef = (*it)->getValue();
935     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
936   }
937   std::vector<std::string> ModuleMapFiles =
938       Args.getAllArgValues(OPT_fmodule_map_file);
939   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
940 
941   // Add -I..., -F..., and -index-header-map options in order.
942   bool IsIndexHeaderMap = false;
943   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
944                                              OPT_index_header_map),
945        ie = Args.filtered_end(); it != ie; ++it) {
946     if ((*it)->getOption().matches(OPT_index_header_map)) {
947       // -index-header-map applies to the next -I or -F.
948       IsIndexHeaderMap = true;
949       continue;
950     }
951 
952     frontend::IncludeDirGroup Group
953       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
954 
955     Opts.AddPath((*it)->getValue(), Group,
956                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
957     IsIndexHeaderMap = false;
958   }
959 
960   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
961   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
962   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
963                                              OPT_iwithprefixbefore),
964          ie = Args.filtered_end(); it != ie; ++it) {
965     const Arg *A = *it;
966     if (A->getOption().matches(OPT_iprefix))
967       Prefix = A->getValue();
968     else if (A->getOption().matches(OPT_iwithprefix))
969       Opts.AddPath(Prefix.str() + A->getValue(),
970                    frontend::After, false, true);
971     else
972       Opts.AddPath(Prefix.str() + A->getValue(),
973                    frontend::Angled, false, true);
974   }
975 
976   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
977          ie = Args.filtered_end(); it != ie; ++it)
978     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
979   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
980          ie = Args.filtered_end(); it != ie; ++it)
981     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
982   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
983          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
984     Opts.AddPath((*it)->getValue(), frontend::System, false,
985                  !(*it)->getOption().matches(OPT_iwithsysroot));
986   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
987          ie = Args.filtered_end(); it != ie; ++it)
988     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
989 
990   // Add the paths for the various language specific isystem flags.
991   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
992        ie = Args.filtered_end(); it != ie; ++it)
993     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
994   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
995        ie = Args.filtered_end(); it != ie; ++it)
996     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
997   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
998        ie = Args.filtered_end(); it != ie; ++it)
999     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
1000   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
1001        ie = Args.filtered_end(); it != ie; ++it)
1002     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
1003 
1004   // Add the internal paths from a driver that detects standard include paths.
1005   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
1006                                             OPT_internal_externc_isystem),
1007                     E = Args.filtered_end();
1008        I != E; ++I) {
1009     frontend::IncludeDirGroup Group = frontend::System;
1010     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
1011       Group = frontend::ExternCSystem;
1012     Opts.AddPath((*I)->getValue(), Group, false, true);
1013   }
1014 
1015   // Add the path prefixes which are implicitly treated as being system headers.
1016   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
1017                                             OPT_ino_system_prefix),
1018                     E = Args.filtered_end();
1019        I != E; ++I)
1020     Opts.AddSystemHeaderPrefix((*I)->getValue(),
1021                                (*I)->getOption().matches(OPT_isystem_prefix));
1022 }
1023 
1024 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1025                                          LangStandard::Kind LangStd) {
1026   // Set some properties which depend solely on the input kind; it would be nice
1027   // to move these to the language standard, and have the driver resolve the
1028   // input kind + language standard.
1029   if (IK == IK_Asm) {
1030     Opts.AsmPreprocessor = 1;
1031   } else if (IK == IK_ObjC ||
1032              IK == IK_ObjCXX ||
1033              IK == IK_PreprocessedObjC ||
1034              IK == IK_PreprocessedObjCXX) {
1035     Opts.ObjC1 = Opts.ObjC2 = 1;
1036   }
1037 
1038   if (LangStd == LangStandard::lang_unspecified) {
1039     // Based on the base language, pick one.
1040     switch (IK) {
1041     case IK_None:
1042     case IK_AST:
1043     case IK_LLVM_IR:
1044       llvm_unreachable("Invalid input kind!");
1045     case IK_OpenCL:
1046       LangStd = LangStandard::lang_opencl;
1047       break;
1048     case IK_CUDA:
1049       LangStd = LangStandard::lang_cuda;
1050       break;
1051     case IK_Asm:
1052     case IK_C:
1053     case IK_PreprocessedC:
1054     case IK_ObjC:
1055     case IK_PreprocessedObjC:
1056       LangStd = LangStandard::lang_gnu99;
1057       break;
1058     case IK_CXX:
1059     case IK_PreprocessedCXX:
1060     case IK_ObjCXX:
1061     case IK_PreprocessedObjCXX:
1062       LangStd = LangStandard::lang_gnucxx98;
1063       break;
1064     }
1065   }
1066 
1067   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1068   Opts.LineComment = Std.hasLineComments();
1069   Opts.C99 = Std.isC99();
1070   Opts.C11 = Std.isC11();
1071   Opts.CPlusPlus = Std.isCPlusPlus();
1072   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1073   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1074   Opts.Digraphs = Std.hasDigraphs();
1075   Opts.GNUMode = Std.isGNUMode();
1076   Opts.GNUInline = !Std.isC99();
1077   Opts.HexFloats = Std.hasHexFloats();
1078   Opts.ImplicitInt = Std.hasImplicitInt();
1079 
1080   // Set OpenCL Version.
1081   if (LangStd == LangStandard::lang_opencl) {
1082     Opts.OpenCL = 1;
1083     Opts.OpenCLVersion = 100;
1084   }
1085   else if (LangStd == LangStandard::lang_opencl11) {
1086       Opts.OpenCL = 1;
1087       Opts.OpenCLVersion = 110;
1088   }
1089   else if (LangStd == LangStandard::lang_opencl12) {
1090     Opts.OpenCL = 1;
1091     Opts.OpenCLVersion = 120;
1092   }
1093 
1094   // OpenCL has some additional defaults.
1095   if (Opts.OpenCL) {
1096     Opts.AltiVec = 0;
1097     Opts.CXXOperatorNames = 1;
1098     Opts.LaxVectorConversions = 0;
1099     Opts.DefaultFPContract = 1;
1100     Opts.NativeHalfType = 1;
1101   }
1102 
1103   if (LangStd == LangStandard::lang_cuda)
1104     Opts.CUDA = 1;
1105 
1106   // OpenCL and C++ both have bool, true, false keywords.
1107   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1108 
1109   // C++ has wchar_t keyword.
1110   Opts.WChar = Opts.CPlusPlus;
1111 
1112   Opts.GNUKeywords = Opts.GNUMode;
1113   Opts.CXXOperatorNames = Opts.CPlusPlus;
1114 
1115   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1116   // is specified, or -std is set to a conforming mode.
1117   Opts.Trigraphs = !Opts.GNUMode;
1118 
1119   Opts.DollarIdents = !Opts.AsmPreprocessor;
1120 
1121   // C++1y onwards has sized global deallocation functions.
1122   Opts.SizedDeallocation = Opts.CPlusPlus1y;
1123 }
1124 
1125 /// Attempt to parse a visibility value out of the given argument.
1126 static Visibility parseVisibility(Arg *arg, ArgList &args,
1127                                   DiagnosticsEngine &diags) {
1128   StringRef value = arg->getValue();
1129   if (value == "default") {
1130     return DefaultVisibility;
1131   } else if (value == "hidden") {
1132     return HiddenVisibility;
1133   } else if (value == "protected") {
1134     // FIXME: diagnose if target does not support protected visibility
1135     return ProtectedVisibility;
1136   }
1137 
1138   diags.Report(diag::err_drv_invalid_value)
1139     << arg->getAsString(args) << value;
1140   return DefaultVisibility;
1141 }
1142 
1143 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1144                           DiagnosticsEngine &Diags) {
1145   // FIXME: Cleanup per-file based stuff.
1146   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1147   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1148     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1149 #define LANGSTANDARD(id, name, desc, features) \
1150       .Case(name, LangStandard::lang_##id)
1151 #include "clang/Frontend/LangStandards.def"
1152       .Default(LangStandard::lang_unspecified);
1153     if (LangStd == LangStandard::lang_unspecified)
1154       Diags.Report(diag::err_drv_invalid_value)
1155         << A->getAsString(Args) << A->getValue();
1156     else {
1157       // Valid standard, check to make sure language and standard are
1158       // compatible.
1159       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1160       switch (IK) {
1161       case IK_C:
1162       case IK_ObjC:
1163       case IK_PreprocessedC:
1164       case IK_PreprocessedObjC:
1165         if (!(Std.isC89() || Std.isC99()))
1166           Diags.Report(diag::err_drv_argument_not_allowed_with)
1167             << A->getAsString(Args) << "C/ObjC";
1168         break;
1169       case IK_CXX:
1170       case IK_ObjCXX:
1171       case IK_PreprocessedCXX:
1172       case IK_PreprocessedObjCXX:
1173         if (!Std.isCPlusPlus())
1174           Diags.Report(diag::err_drv_argument_not_allowed_with)
1175             << A->getAsString(Args) << "C++/ObjC++";
1176         break;
1177       case IK_OpenCL:
1178         if (!Std.isC99())
1179           Diags.Report(diag::err_drv_argument_not_allowed_with)
1180             << A->getAsString(Args) << "OpenCL";
1181         break;
1182       case IK_CUDA:
1183         if (!Std.isCPlusPlus())
1184           Diags.Report(diag::err_drv_argument_not_allowed_with)
1185             << A->getAsString(Args) << "CUDA";
1186         break;
1187       default:
1188         break;
1189       }
1190     }
1191   }
1192 
1193   // -cl-std only applies for OpenCL language standards.
1194   // Override the -std option in this case.
1195   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1196     LangStandard::Kind OpenCLLangStd
1197     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1198     .Case("CL", LangStandard::lang_opencl)
1199     .Case("CL1.1", LangStandard::lang_opencl11)
1200     .Case("CL1.2", LangStandard::lang_opencl12)
1201     .Default(LangStandard::lang_unspecified);
1202 
1203     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1204       Diags.Report(diag::err_drv_invalid_value)
1205       << A->getAsString(Args) << A->getValue();
1206     }
1207     else
1208       LangStd = OpenCLLangStd;
1209   }
1210 
1211   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1212 
1213   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1214   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1215   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1216   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1217   // name, as it doesn't seem a useful distinction.
1218   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1219                                   Opts.GNUKeywords);
1220 
1221   if (Args.hasArg(OPT_fno_operator_names))
1222     Opts.CXXOperatorNames = 0;
1223 
1224   if (Opts.ObjC1) {
1225     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1226       StringRef value = arg->getValue();
1227       if (Opts.ObjCRuntime.tryParse(value))
1228         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1229     }
1230 
1231     if (Args.hasArg(OPT_fobjc_gc_only))
1232       Opts.setGC(LangOptions::GCOnly);
1233     else if (Args.hasArg(OPT_fobjc_gc))
1234       Opts.setGC(LangOptions::HybridGC);
1235     else if (Args.hasArg(OPT_fobjc_arc)) {
1236       Opts.ObjCAutoRefCount = 1;
1237       if (!Opts.ObjCRuntime.allowsARC())
1238         Diags.Report(diag::err_arc_unsupported_on_runtime);
1239 
1240       // Only set ObjCARCWeak if ARC is enabled.
1241       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1242         Opts.ObjCARCWeak = 1;
1243       else
1244         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1245     }
1246 
1247     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1248       Opts.ObjCInferRelatedResultType = 0;
1249 
1250     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1251       Opts.ObjCSubscriptingLegacyRuntime =
1252         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1253   }
1254 
1255   if (Args.hasArg(OPT_fgnu89_inline))
1256     Opts.GNUInline = 1;
1257 
1258   if (Args.hasArg(OPT_fapple_kext)) {
1259     if (!Opts.CPlusPlus)
1260       Diags.Report(diag::warn_c_kext);
1261     else
1262       Opts.AppleKext = 1;
1263   }
1264 
1265   if (Args.hasArg(OPT_print_ivar_layout))
1266     Opts.ObjCGCBitmapPrint = 1;
1267   if (Args.hasArg(OPT_fno_constant_cfstrings))
1268     Opts.NoConstantCFStrings = 1;
1269 
1270   if (Args.hasArg(OPT_faltivec))
1271     Opts.AltiVec = 1;
1272 
1273   if (Args.hasArg(OPT_pthread))
1274     Opts.POSIXThreads = 1;
1275 
1276   // The value-visibility mode defaults to "default".
1277   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1278     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1279   } else {
1280     Opts.setValueVisibilityMode(DefaultVisibility);
1281   }
1282 
1283   // The type-visibility mode defaults to the value-visibility mode.
1284   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1285     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1286   } else {
1287     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1288   }
1289 
1290   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1291     Opts.InlineVisibilityHidden = 1;
1292 
1293   if (Args.hasArg(OPT_ftrapv)) {
1294     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1295     // Set the handler, if one is specified.
1296     Opts.OverflowHandler =
1297         Args.getLastArgValue(OPT_ftrapv_handler);
1298   }
1299   else if (Args.hasArg(OPT_fwrapv))
1300     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1301 
1302   if (Args.hasArg(OPT_trigraphs))
1303     Opts.Trigraphs = 1;
1304 
1305   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1306                                    OPT_fno_dollars_in_identifiers,
1307                                    Opts.DollarIdents);
1308   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1309   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1310   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1311   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1312   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1313   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1314   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1315   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1316   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1317                                    Opts.ConstStrings);
1318   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1319     Opts.LaxVectorConversions = 0;
1320   if (Args.hasArg(OPT_fno_threadsafe_statics))
1321     Opts.ThreadsafeStatics = 0;
1322   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1323   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1324   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1325   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1326   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1327 
1328   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1329   Opts.Blocks = Args.hasArg(OPT_fblocks);
1330   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1331   Opts.Modules = Args.hasArg(OPT_fmodules);
1332   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1333   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1334   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1335   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1336   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1337   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1338   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1339   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1340   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1341   Opts.SizedDeallocation |= Args.hasArg(OPT_fsized_deallocation);
1342   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1343   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1344   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1345   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1346   Opts.InstantiationDepth =
1347       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1348   Opts.ArrowDepth =
1349       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1350   Opts.ConstexprCallDepth =
1351       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1352   Opts.ConstexprStepLimit =
1353       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1354   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1355   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1356   Opts.NumLargeByValueCopy =
1357       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1358   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1359   Opts.ObjCConstantStringClass =
1360     Args.getLastArgValue(OPT_fconstant_string_class);
1361   Opts.ObjCDefaultSynthProperties =
1362     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1363   Opts.EncodeExtendedBlockSig =
1364     Args.hasArg(OPT_fencode_extended_block_signature);
1365   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1366   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1367   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1368   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1369   Opts.Static = Args.hasArg(OPT_static_define);
1370   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1371   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1372                         || Args.hasArg(OPT_fdump_record_layouts);
1373   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1374   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1375   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1376   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1377   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1378   Opts.MRTD = Args.hasArg(OPT_mrtd);
1379   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1380   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1381   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1382   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1383   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1384   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1385   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1386   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1387 
1388   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1389     switch (llvm::StringSwitch<unsigned>(A->getValue())
1390       .Case("target", LangOptions::ASMM_Target)
1391       .Case("no", LangOptions::ASMM_Off)
1392       .Case("yes", LangOptions::ASMM_On)
1393       .Default(255)) {
1394     default:
1395       Diags.Report(diag::err_drv_invalid_value)
1396         << "-faddress-space-map-mangling=" << A->getValue();
1397       break;
1398     case LangOptions::ASMM_Target:
1399       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1400       break;
1401     case LangOptions::ASMM_On:
1402       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1403       break;
1404     case LangOptions::ASMM_Off:
1405       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1406       break;
1407     }
1408   }
1409 
1410   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
1411     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
1412         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
1413             A->getValue())
1414             .Case("single",
1415                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
1416             .Case("multiple",
1417                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
1418             .Case("virtual",
1419                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
1420             .Default(LangOptions::PPTMK_BestCase);
1421     if (InheritanceModel == LangOptions::PPTMK_BestCase)
1422       Diags.Report(diag::err_drv_invalid_value)
1423           << "-fms-memptr-rep=" << A->getValue();
1424 
1425     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
1426   }
1427 
1428   // Check if -fopenmp is specified.
1429   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1430 
1431   // Record whether the __DEPRECATED define was requested.
1432   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1433                                  OPT_fno_deprecated_macro,
1434                                  Opts.Deprecated);
1435 
1436   // FIXME: Eliminate this dependency.
1437   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1438        OptSize = getOptimizationLevelSize(Args);
1439   Opts.Optimize = Opt != 0;
1440   Opts.OptimizeSize = OptSize != 0;
1441 
1442   // This is the __NO_INLINE__ define, which just depends on things like the
1443   // optimization level and -fno-inline, not actually whether the backend has
1444   // inlining enabled.
1445   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1446 
1447   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1448   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1449 
1450   Opts.RetainCommentsFromSystemHeaders =
1451       Args.hasArg(OPT_fretain_comments_from_system_headers);
1452 
1453   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1454   switch (SSP) {
1455   default:
1456     Diags.Report(diag::err_drv_invalid_value)
1457       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1458     break;
1459   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1460   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1461   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
1462   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
1463   }
1464 
1465   // Parse -fsanitize= arguments.
1466   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1467   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1468     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1469     // efficiently map string values to them. Perform the mapping indirectly:
1470     // convert strings to enumerated values, then switch over the enum to set
1471     // the right bitfield value.
1472     enum Sanitizer {
1473 #define SANITIZER(NAME, ID) \
1474       ID,
1475 #include "clang/Basic/Sanitizers.def"
1476       Unknown
1477     };
1478     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1479 #define SANITIZER(NAME, ID) \
1480               .Case(NAME, ID)
1481 #include "clang/Basic/Sanitizers.def"
1482               .Default(Unknown)) {
1483 #define SANITIZER(NAME, ID) \
1484     case ID: \
1485       Opts.Sanitize.ID = true; \
1486       break;
1487 #include "clang/Basic/Sanitizers.def"
1488 
1489     case Unknown:
1490       Diags.Report(diag::err_drv_invalid_value)
1491         << "-fsanitize=" << Sanitizers[I];
1492       break;
1493     }
1494   }
1495 }
1496 
1497 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1498                                   FileManager &FileMgr,
1499                                   DiagnosticsEngine &Diags) {
1500   using namespace options;
1501   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1502   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1503   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1504       Opts.TokenCache = A->getValue();
1505   else
1506     Opts.TokenCache = Opts.ImplicitPTHInclude;
1507   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1508   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1509   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1510 
1511   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1512   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1513          ie = Args.filtered_end(); it != ie; ++it) {
1514     const Arg *A = *it;
1515     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1516   }
1517 
1518   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1519     StringRef Value(A->getValue());
1520     size_t Comma = Value.find(',');
1521     unsigned Bytes = 0;
1522     unsigned EndOfLine = 0;
1523 
1524     if (Comma == StringRef::npos ||
1525         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1526         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1527       Diags.Report(diag::err_drv_preamble_format);
1528     else {
1529       Opts.PrecompiledPreambleBytes.first = Bytes;
1530       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1531     }
1532   }
1533 
1534   // Add macros from the command line.
1535   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1536          ie = Args.filtered_end(); it != ie; ++it) {
1537     if ((*it)->getOption().matches(OPT_D))
1538       Opts.addMacroDef((*it)->getValue());
1539     else
1540       Opts.addMacroUndef((*it)->getValue());
1541   }
1542 
1543   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1544 
1545   // Add the ordered list of -includes.
1546   for (arg_iterator it = Args.filtered_begin(OPT_include),
1547          ie = Args.filtered_end(); it != ie; ++it) {
1548     const Arg *A = *it;
1549     Opts.Includes.push_back(A->getValue());
1550   }
1551 
1552   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1553          ie = Args.filtered_end(); it != ie; ++it) {
1554     const Arg *A = *it;
1555     Opts.ChainedIncludes.push_back(A->getValue());
1556   }
1557 
1558   // Include 'altivec.h' if -faltivec option present
1559   if (Args.hasArg(OPT_faltivec))
1560     Opts.Includes.push_back("altivec.h");
1561 
1562   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1563          ie = Args.filtered_end(); it != ie; ++it) {
1564     const Arg *A = *it;
1565     std::pair<StringRef,StringRef> Split =
1566       StringRef(A->getValue()).split(';');
1567 
1568     if (Split.second.empty()) {
1569       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1570       continue;
1571     }
1572 
1573     Opts.addRemappedFile(Split.first, Split.second);
1574   }
1575 
1576   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1577     StringRef Name = A->getValue();
1578     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1579       .Case("libc++", ARCXX_libcxx)
1580       .Case("libstdc++", ARCXX_libstdcxx)
1581       .Case("none", ARCXX_nolib)
1582       .Default(~0U);
1583     if (Library == ~0U)
1584       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1585     else
1586       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1587   }
1588 }
1589 
1590 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1591                                         ArgList &Args,
1592                                         frontend::ActionKind Action) {
1593   using namespace options;
1594 
1595   switch (Action) {
1596   case frontend::ASTDeclList:
1597   case frontend::ASTDump:
1598   case frontend::ASTPrint:
1599   case frontend::ASTView:
1600   case frontend::EmitAssembly:
1601   case frontend::EmitBC:
1602   case frontend::EmitHTML:
1603   case frontend::EmitLLVM:
1604   case frontend::EmitLLVMOnly:
1605   case frontend::EmitCodeGenOnly:
1606   case frontend::EmitObj:
1607   case frontend::FixIt:
1608   case frontend::GenerateModule:
1609   case frontend::GeneratePCH:
1610   case frontend::GeneratePTH:
1611   case frontend::ParseSyntaxOnly:
1612   case frontend::ModuleFileInfo:
1613   case frontend::VerifyPCH:
1614   case frontend::PluginAction:
1615   case frontend::PrintDeclContext:
1616   case frontend::RewriteObjC:
1617   case frontend::RewriteTest:
1618   case frontend::RunAnalysis:
1619   case frontend::MigrateSource:
1620     Opts.ShowCPP = 0;
1621     break;
1622 
1623   case frontend::DumpRawTokens:
1624   case frontend::DumpTokens:
1625   case frontend::InitOnly:
1626   case frontend::PrintPreamble:
1627   case frontend::PrintPreprocessedInput:
1628   case frontend::RewriteMacros:
1629   case frontend::RunPreprocessorOnly:
1630     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1631     break;
1632   }
1633 
1634   Opts.ShowComments = Args.hasArg(OPT_C);
1635   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1636   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1637   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1638   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1639 }
1640 
1641 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1642   using namespace options;
1643   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1644   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1645   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1646   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1647   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1648   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1649 
1650   // Use the default target triple if unspecified.
1651   if (Opts.Triple.empty())
1652     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1653 }
1654 
1655 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1656                                         const char *const *ArgBegin,
1657                                         const char *const *ArgEnd,
1658                                         DiagnosticsEngine &Diags) {
1659   bool Success = true;
1660 
1661   // Parse the arguments.
1662   OwningPtr<OptTable> Opts(createDriverOptTable());
1663   const unsigned IncludedFlagsBitmask = options::CC1Option;
1664   unsigned MissingArgIndex, MissingArgCount;
1665   OwningPtr<InputArgList> Args(
1666     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1667                     IncludedFlagsBitmask));
1668 
1669   // Check for missing argument error.
1670   if (MissingArgCount) {
1671     Diags.Report(diag::err_drv_missing_argument)
1672       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1673     Success = false;
1674   }
1675 
1676   // Issue errors on unknown arguments.
1677   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1678          ie = Args->filtered_end(); it != ie; ++it) {
1679     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1680     Success = false;
1681   }
1682 
1683   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1684   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1685   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1686   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1687             && Success;
1688   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1689   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1690   // FIXME: We shouldn't have to pass the DashX option around here
1691   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1692   ParseTargetArgs(Res.getTargetOpts(), *Args);
1693   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags,
1694                              Res.getTargetOpts()) && Success;
1695   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1696   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1697     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1698     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1699       Res.getLangOpts()->ObjCExceptions = 1;
1700   }
1701   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1702   // PCH file and find the original header name. Remove the need to do that in
1703   // ParsePreprocessorArgs and remove the FileManager
1704   // parameters from the function and the "FileManager.h" #include.
1705   FileManager FileMgr(Res.getFileSystemOpts());
1706   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1707   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1708                               Res.getFrontendOpts().ProgramAction);
1709   return Success;
1710 }
1711 
1712 namespace {
1713 
1714   class ModuleSignature {
1715     SmallVector<uint64_t, 16> Data;
1716     unsigned CurBit;
1717     uint64_t CurValue;
1718 
1719   public:
1720     ModuleSignature() : CurBit(0), CurValue(0) { }
1721 
1722     void add(uint64_t Value, unsigned Bits);
1723     void add(StringRef Value);
1724     void flush();
1725 
1726     llvm::APInt getAsInteger() const;
1727   };
1728 }
1729 
1730 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1731   CurValue |= Value << CurBit;
1732   if (CurBit + NumBits < 64) {
1733     CurBit += NumBits;
1734     return;
1735   }
1736 
1737   // Add the current word.
1738   Data.push_back(CurValue);
1739 
1740   if (CurBit)
1741     CurValue = Value >> (64-CurBit);
1742   else
1743     CurValue = 0;
1744   CurBit = (CurBit+NumBits) & 63;
1745 }
1746 
1747 void ModuleSignature::flush() {
1748   if (CurBit == 0)
1749     return;
1750 
1751   Data.push_back(CurValue);
1752   CurBit = 0;
1753   CurValue = 0;
1754 }
1755 
1756 void ModuleSignature::add(StringRef Value) {
1757   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1758     add(*I, 8);
1759 }
1760 
1761 llvm::APInt ModuleSignature::getAsInteger() const {
1762   return llvm::APInt(Data.size() * 64, Data);
1763 }
1764 
1765 std::string CompilerInvocation::getModuleHash() const {
1766   // Note: For QoI reasons, the things we use as a hash here should all be
1767   // dumped via the -module-info flag.
1768   using llvm::hash_code;
1769   using llvm::hash_value;
1770   using llvm::hash_combine;
1771 
1772   // Start the signature with the compiler version.
1773   // FIXME: We'd rather use something more cryptographically sound than
1774   // CityHash, but this will do for now.
1775   hash_code code = hash_value(getClangFullRepositoryVersion());
1776 
1777   // Extend the signature with the language options
1778 #define LANGOPT(Name, Bits, Default, Description) \
1779    code = hash_combine(code, LangOpts->Name);
1780 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1781   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1782 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1783 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1784 #include "clang/Basic/LangOptions.def"
1785 
1786   // Extend the signature with the target options.
1787   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1788                       TargetOpts->ABI, TargetOpts->LinkerVersion);
1789   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1790     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1791 
1792   // Extend the signature with preprocessor options.
1793   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1794   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1795   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1796 
1797   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1798             I = getPreprocessorOpts().Macros.begin(),
1799          IEnd = getPreprocessorOpts().Macros.end();
1800        I != IEnd; ++I) {
1801     // If we're supposed to ignore this macro for the purposes of modules,
1802     // don't put it into the hash.
1803     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1804       // Check whether we're ignoring this macro.
1805       StringRef MacroDef = I->first;
1806       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1807         continue;
1808     }
1809 
1810     code = hash_combine(code, I->first, I->second);
1811   }
1812 
1813   // Extend the signature with the sysroot.
1814   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1815                       hsOpts.UseStandardSystemIncludes,
1816                       hsOpts.UseStandardCXXIncludes,
1817                       hsOpts.UseLibcxx);
1818 
1819   // Darwin-specific hack: if we have a sysroot, use the contents and
1820   // modification time of
1821   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1822   // as part of the module hash.
1823   if (!hsOpts.Sysroot.empty()) {
1824     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1825     SmallString<128> systemVersionFile;
1826     systemVersionFile += hsOpts.Sysroot;
1827     llvm::sys::path::append(systemVersionFile, "System");
1828     llvm::sys::path::append(systemVersionFile, "Library");
1829     llvm::sys::path::append(systemVersionFile, "CoreServices");
1830     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1831     if (!llvm::MemoryBuffer::getFile(systemVersionFile.str(), buffer)) {
1832       code = hash_combine(code, buffer.get()->getBuffer());
1833 
1834       struct stat statBuf;
1835       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1836         code = hash_combine(code, statBuf.st_mtime);
1837     }
1838   }
1839 
1840   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1841 }
1842 
1843 namespace clang {
1844 
1845 template<typename IntTy>
1846 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
1847                                     IntTy Default,
1848                                     DiagnosticsEngine *Diags) {
1849   IntTy Res = Default;
1850   if (Arg *A = Args.getLastArg(Id)) {
1851     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1852       if (Diags)
1853         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1854                                                        << A->getValue();
1855     }
1856   }
1857   return Res;
1858 }
1859 
1860 
1861 // Declared in clang/Frontend/Utils.h.
1862 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1863                        DiagnosticsEngine *Diags) {
1864   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
1865 }
1866 
1867 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
1868                                uint64_t Default,
1869                                DiagnosticsEngine *Diags) {
1870   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
1871 }
1872 
1873 void BuryPointer(const void *Ptr) {
1874   // This function may be called only a small fixed amount of times per each
1875   // invocation, otherwise we do actually have a leak which we want to report.
1876   // If this function is called more than kGraveYardMaxSize times, the pointers
1877   // will not be properly buried and a leak detector will report a leak, which
1878   // is what we want in such case.
1879   static const size_t kGraveYardMaxSize = 16;
1880   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
1881   static llvm::sys::cas_flag GraveYardSize;
1882   llvm::sys::cas_flag Idx = llvm::sys::AtomicIncrement(&GraveYardSize) - 1;
1883   if (Idx >= kGraveYardMaxSize)
1884     return;
1885   GraveYard[Idx] = Ptr;
1886 }
1887 }
1888