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.DisableIntegratedAS = Args.hasArg(OPT_fno_integrated_as);
370   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
371   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
372   Opts.ProfileInstrGenerate = Args.hasArg(OPT_fprofile_instr_generate);
373   Opts.InstrProfileInput = Args.getLastArgValue(OPT_fprofile_instr_use_EQ);
374   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
375   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
376   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
377   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
378   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
379   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
380   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
381   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
382   Opts.DisableFree = Args.hasArg(OPT_disable_free);
383   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
384   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
385   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
386   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
387   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
388                        Args.hasArg(OPT_cl_finite_math_only)||
389                        Args.hasArg(OPT_cl_fast_relaxed_math));
390   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
391                        Args.hasArg(OPT_cl_finite_math_only)||
392                        Args.hasArg(OPT_cl_fast_relaxed_math));
393   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
394   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
395   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
396   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
397   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
398   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
399   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
400   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
401   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
402   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
403   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
404   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
405   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
406   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
407                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
408                       Args.hasArg(OPT_cl_fast_relaxed_math);
409   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
410   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
411   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
412   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
413 
414   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
415                                        OPT_fno_function_sections, false);
416   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
417                                    OPT_fno_data_sections, false);
418 
419   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
420   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
421   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
422 
423   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
424   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
425   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
426 
427   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
428   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
429   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
430   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
431   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
432     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
433     Opts.CoverageNoFunctionNamesInData =
434         Args.hasArg(OPT_coverage_no_function_names_in_data);
435     if (Args.hasArg(OPT_coverage_version_EQ)) {
436       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
437       if (CoverageVersion.size() != 4) {
438         Diags.Report(diag::err_drv_invalid_value)
439             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
440             << CoverageVersion;
441       } else {
442         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
443       }
444     }
445   }
446 
447   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
448   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
449   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
450   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
451   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
452   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
453   Opts.SanitizeMemoryTrackOrigins =
454     Args.hasArg(OPT_fsanitize_memory_track_origins);
455   Opts.SanitizeUndefinedTrapOnError =
456     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
457   Opts.SSPBufferSize =
458       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
459   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
460   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
461     StringRef Val = A->getValue();
462     unsigned StackAlignment = Opts.StackAlignment;
463     Val.getAsInteger(10, StackAlignment);
464     Opts.StackAlignment = StackAlignment;
465   }
466 
467   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
468     StringRef Name = A->getValue();
469     unsigned Method = llvm::StringSwitch<unsigned>(Name)
470       .Case("legacy", CodeGenOptions::Legacy)
471       .Case("non-legacy", CodeGenOptions::NonLegacy)
472       .Case("mixed", CodeGenOptions::Mixed)
473       .Default(~0U);
474     if (Method == ~0U) {
475       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
476       Success = false;
477     } else {
478       Opts.setObjCDispatchMethod(
479         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
480     }
481   }
482 
483   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
484     StringRef Name = A->getValue();
485     unsigned Model = llvm::StringSwitch<unsigned>(Name)
486         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
487         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
488         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
489         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
490         .Default(~0U);
491     if (Model == ~0U) {
492       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
493       Success = false;
494     } else {
495       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
496     }
497   }
498 
499   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
500     StringRef Val = A->getValue();
501     if (Val == "fast")
502       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
503     else if (Val == "on")
504       Opts.setFPContractMode(CodeGenOptions::FPC_On);
505     else if (Val == "off")
506       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
507     else
508       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
509   }
510 
511   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
512     if (A->getOption().matches(OPT_fpcc_struct_return)) {
513       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
514     } else {
515       assert(A->getOption().matches(OPT_freg_struct_return));
516       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
517     }
518   }
519 
520   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
521 
522   return Success;
523 }
524 
525 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
526                                       ArgList &Args) {
527   using namespace options;
528   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
529   Opts.Targets = Args.getAllArgValues(OPT_MT);
530   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
531   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
532   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
533   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
534   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
535   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
536   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
537 }
538 
539 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
540                                 DiagnosticsEngine *Diags) {
541   using namespace options;
542   bool Success = true;
543 
544   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
545   Opts.DiagnosticSerializationFile =
546     Args.getLastArgValue(OPT_diagnostic_serialized_file);
547   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
548   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
549   Opts.Pedantic = Args.hasArg(OPT_pedantic);
550   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
551   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
552   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
553   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
554                                  OPT_fno_show_column,
555                                  /*Default=*/true);
556   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
557   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
558   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
559 
560   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
561 
562   // Default behavior is to not to show note include stacks.
563   Opts.ShowNoteIncludeStack = false;
564   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
565                                OPT_fno_diagnostics_show_note_include_stack))
566     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
567       Opts.ShowNoteIncludeStack = true;
568 
569   StringRef ShowOverloads =
570     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
571   if (ShowOverloads == "best")
572     Opts.setShowOverloads(Ovl_Best);
573   else if (ShowOverloads == "all")
574     Opts.setShowOverloads(Ovl_All);
575   else {
576     Success = false;
577     if (Diags)
578       Diags->Report(diag::err_drv_invalid_value)
579       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
580       << ShowOverloads;
581   }
582 
583   StringRef ShowCategory =
584     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
585   if (ShowCategory == "none")
586     Opts.ShowCategories = 0;
587   else if (ShowCategory == "id")
588     Opts.ShowCategories = 1;
589   else if (ShowCategory == "name")
590     Opts.ShowCategories = 2;
591   else {
592     Success = false;
593     if (Diags)
594       Diags->Report(diag::err_drv_invalid_value)
595       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
596       << ShowCategory;
597   }
598 
599   StringRef Format =
600     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
601   if (Format == "clang")
602     Opts.setFormat(DiagnosticOptions::Clang);
603   else if (Format == "msvc")
604     Opts.setFormat(DiagnosticOptions::Msvc);
605   else if (Format == "msvc-fallback") {
606     Opts.setFormat(DiagnosticOptions::Msvc);
607     Opts.CLFallbackMode = true;
608   } else if (Format == "vi")
609     Opts.setFormat(DiagnosticOptions::Vi);
610   else {
611     Success = false;
612     if (Diags)
613       Diags->Report(diag::err_drv_invalid_value)
614       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
615       << Format;
616   }
617 
618   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
619   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
620   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
621   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
622   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
623   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
624   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
625   Opts.MacroBacktraceLimit =
626       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
627                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
628   Opts.TemplateBacktraceLimit = getLastArgIntValue(
629       Args, OPT_ftemplate_backtrace_limit,
630       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
631   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
632       Args, OPT_fconstexpr_backtrace_limit,
633       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
634   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
635                                     DiagnosticOptions::DefaultTabStop, Diags);
636   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
637     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
638     if (Diags)
639       Diags->Report(diag::warn_ignoring_ftabstop_value)
640       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
641   }
642   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
643   addWarningArgs(Args, Opts.Warnings);
644 
645   return Success;
646 }
647 
648 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
649   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
650 }
651 
652 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
653                                    DiagnosticsEngine &Diags) {
654   using namespace options;
655   Opts.ProgramAction = frontend::ParseSyntaxOnly;
656   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
657     switch (A->getOption().getID()) {
658     default:
659       llvm_unreachable("Invalid option in group!");
660     case OPT_ast_list:
661       Opts.ProgramAction = frontend::ASTDeclList; break;
662     case OPT_ast_dump:
663       Opts.ProgramAction = frontend::ASTDump; break;
664     case OPT_ast_print:
665       Opts.ProgramAction = frontend::ASTPrint; break;
666     case OPT_ast_view:
667       Opts.ProgramAction = frontend::ASTView; break;
668     case OPT_dump_raw_tokens:
669       Opts.ProgramAction = frontend::DumpRawTokens; break;
670     case OPT_dump_tokens:
671       Opts.ProgramAction = frontend::DumpTokens; break;
672     case OPT_S:
673       Opts.ProgramAction = frontend::EmitAssembly; break;
674     case OPT_emit_llvm_bc:
675       Opts.ProgramAction = frontend::EmitBC; break;
676     case OPT_emit_html:
677       Opts.ProgramAction = frontend::EmitHTML; break;
678     case OPT_emit_llvm:
679       Opts.ProgramAction = frontend::EmitLLVM; break;
680     case OPT_emit_llvm_only:
681       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
682     case OPT_emit_codegen_only:
683       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
684     case OPT_emit_obj:
685       Opts.ProgramAction = frontend::EmitObj; break;
686     case OPT_fixit_EQ:
687       Opts.FixItSuffix = A->getValue();
688       // fall-through!
689     case OPT_fixit:
690       Opts.ProgramAction = frontend::FixIt; break;
691     case OPT_emit_module:
692       Opts.ProgramAction = frontend::GenerateModule; break;
693     case OPT_emit_pch:
694       Opts.ProgramAction = frontend::GeneratePCH; break;
695     case OPT_emit_pth:
696       Opts.ProgramAction = frontend::GeneratePTH; break;
697     case OPT_init_only:
698       Opts.ProgramAction = frontend::InitOnly; break;
699     case OPT_fsyntax_only:
700       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
701     case OPT_module_file_info:
702       Opts.ProgramAction = frontend::ModuleFileInfo; break;
703     case OPT_verify_pch:
704       Opts.ProgramAction = frontend::VerifyPCH; break;
705     case OPT_print_decl_contexts:
706       Opts.ProgramAction = frontend::PrintDeclContext; break;
707     case OPT_print_preamble:
708       Opts.ProgramAction = frontend::PrintPreamble; break;
709     case OPT_E:
710       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
711     case OPT_rewrite_macros:
712       Opts.ProgramAction = frontend::RewriteMacros; break;
713     case OPT_rewrite_objc:
714       Opts.ProgramAction = frontend::RewriteObjC; break;
715     case OPT_rewrite_test:
716       Opts.ProgramAction = frontend::RewriteTest; break;
717     case OPT_analyze:
718       Opts.ProgramAction = frontend::RunAnalysis; break;
719     case OPT_migrate:
720       Opts.ProgramAction = frontend::MigrateSource; break;
721     case OPT_Eonly:
722       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
723     }
724   }
725 
726   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
727     Opts.Plugins.push_back(A->getValue(0));
728     Opts.ProgramAction = frontend::PluginAction;
729     Opts.ActionName = A->getValue();
730 
731     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
732            end = Args.filtered_end(); it != end; ++it) {
733       if ((*it)->getValue(0) == Opts.ActionName)
734         Opts.PluginArgs.push_back((*it)->getValue(1));
735     }
736   }
737 
738   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
739   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
740   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
741     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
742            end = Args.filtered_end(); it != end; ++it) {
743       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
744         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
745     }
746   }
747 
748   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
749     Opts.CodeCompletionAt =
750       ParsedSourceLocation::FromString(A->getValue());
751     if (Opts.CodeCompletionAt.FileName.empty())
752       Diags.Report(diag::err_drv_invalid_value)
753         << A->getAsString(Args) << A->getValue();
754   }
755   Opts.DisableFree = Args.hasArg(OPT_disable_free);
756 
757   Opts.OutputFile = Args.getLastArgValue(OPT_o);
758   Opts.Plugins = Args.getAllArgValues(OPT_load);
759   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
760   Opts.ShowHelp = Args.hasArg(OPT_help);
761   Opts.ShowStats = Args.hasArg(OPT_print_stats);
762   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
763   Opts.ShowVersion = Args.hasArg(OPT_version);
764   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
765   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
766   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
767   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
768   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
769   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
770   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
771   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
772   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
773   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
774 
775   Opts.CodeCompleteOpts.IncludeMacros
776     = Args.hasArg(OPT_code_completion_macros);
777   Opts.CodeCompleteOpts.IncludeCodePatterns
778     = Args.hasArg(OPT_code_completion_patterns);
779   Opts.CodeCompleteOpts.IncludeGlobals
780     = !Args.hasArg(OPT_no_code_completion_globals);
781   Opts.CodeCompleteOpts.IncludeBriefComments
782     = Args.hasArg(OPT_code_completion_brief_comments);
783 
784   Opts.OverrideRecordLayoutsFile
785     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
786   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
787                                      OPT_arcmt_modify,
788                                      OPT_arcmt_migrate)) {
789     switch (A->getOption().getID()) {
790     default:
791       llvm_unreachable("missed a case");
792     case OPT_arcmt_check:
793       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
794       break;
795     case OPT_arcmt_modify:
796       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
797       break;
798     case OPT_arcmt_migrate:
799       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
800       break;
801     }
802   }
803   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
804   Opts.ARCMTMigrateReportOut
805     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
806   Opts.ARCMTMigrateEmitARCErrors
807     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
808 
809   if (Args.hasArg(OPT_objcmt_migrate_literals))
810     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
811   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
812     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
813   if (Args.hasArg(OPT_objcmt_migrate_property))
814     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
815   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
816     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
817   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
818     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
819   if (Args.hasArg(OPT_objcmt_migrate_annotation))
820     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
821   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
822     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
823   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
824     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
825   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
826     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
827   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
828     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
829   if (Args.hasArg(OPT_objcmt_atomic_property))
830     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
831   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
832     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
833   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
834     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
835   if (Args.hasArg(OPT_objcmt_migrate_all))
836     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
837 
838   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
839 
840   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
841       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
842     Diags.Report(diag::err_drv_argument_not_allowed_with)
843       << "ARC migration" << "ObjC migration";
844   }
845 
846   InputKind DashX = IK_None;
847   if (const Arg *A = Args.getLastArg(OPT_x)) {
848     DashX = llvm::StringSwitch<InputKind>(A->getValue())
849       .Case("c", IK_C)
850       .Case("cl", IK_OpenCL)
851       .Case("cuda", IK_CUDA)
852       .Case("c++", IK_CXX)
853       .Case("objective-c", IK_ObjC)
854       .Case("objective-c++", IK_ObjCXX)
855       .Case("cpp-output", IK_PreprocessedC)
856       .Case("assembler-with-cpp", IK_Asm)
857       .Case("c++-cpp-output", IK_PreprocessedCXX)
858       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
859       .Case("objc-cpp-output", IK_PreprocessedObjC)
860       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
861       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
862       .Case("c-header", IK_C)
863       .Case("cl-header", IK_OpenCL)
864       .Case("objective-c-header", IK_ObjC)
865       .Case("c++-header", IK_CXX)
866       .Case("objective-c++-header", IK_ObjCXX)
867       .Cases("ast", "pcm", IK_AST)
868       .Case("ir", IK_LLVM_IR)
869       .Default(IK_None);
870     if (DashX == IK_None)
871       Diags.Report(diag::err_drv_invalid_value)
872         << A->getAsString(Args) << A->getValue();
873   }
874 
875   // '-' is the default input if none is given.
876   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
877   Opts.Inputs.clear();
878   if (Inputs.empty())
879     Inputs.push_back("-");
880   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
881     InputKind IK = DashX;
882     if (IK == IK_None) {
883       IK = FrontendOptions::getInputKindForExtension(
884         StringRef(Inputs[i]).rsplit('.').second);
885       // FIXME: Remove this hack.
886       if (i == 0)
887         DashX = IK;
888     }
889     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
890   }
891 
892   return DashX;
893 }
894 
895 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
896                                                  void *MainAddr) {
897   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
898 
899   if (!P.empty()) {
900     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
901     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
902 
903     // Get foo/lib/clang/<version>/include
904     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
905   }
906 
907   return P.str();
908 }
909 
910 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
911   using namespace options;
912   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
913   Opts.Verbose = Args.hasArg(OPT_v);
914   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
915   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
916   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
917   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
918     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
919   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
920   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
921   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
922   // -fmodules implies -fmodule-maps
923   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
924   Opts.ModuleCachePruneInterval =
925       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
926   Opts.ModuleCachePruneAfter =
927       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
928   Opts.ModulesValidateOncePerBuildSession =
929       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
930   Opts.BuildSessionTimestamp =
931       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
932   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
933                     ie = Args.filtered_end();
934        it != ie; ++it) {
935     StringRef MacroDef = (*it)->getValue();
936     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
937   }
938   std::vector<std::string> ModuleMapFiles =
939       Args.getAllArgValues(OPT_fmodule_map_file);
940   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
941 
942   // Add -I..., -F..., and -index-header-map options in order.
943   bool IsIndexHeaderMap = false;
944   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
945                                              OPT_index_header_map),
946        ie = Args.filtered_end(); it != ie; ++it) {
947     if ((*it)->getOption().matches(OPT_index_header_map)) {
948       // -index-header-map applies to the next -I or -F.
949       IsIndexHeaderMap = true;
950       continue;
951     }
952 
953     frontend::IncludeDirGroup Group
954       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
955 
956     Opts.AddPath((*it)->getValue(), Group,
957                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
958     IsIndexHeaderMap = false;
959   }
960 
961   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
962   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
963   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
964                                              OPT_iwithprefixbefore),
965          ie = Args.filtered_end(); it != ie; ++it) {
966     const Arg *A = *it;
967     if (A->getOption().matches(OPT_iprefix))
968       Prefix = A->getValue();
969     else if (A->getOption().matches(OPT_iwithprefix))
970       Opts.AddPath(Prefix.str() + A->getValue(),
971                    frontend::After, false, true);
972     else
973       Opts.AddPath(Prefix.str() + A->getValue(),
974                    frontend::Angled, false, true);
975   }
976 
977   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
978          ie = Args.filtered_end(); it != ie; ++it)
979     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
980   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
981          ie = Args.filtered_end(); it != ie; ++it)
982     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
983   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
984          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
985     Opts.AddPath((*it)->getValue(), frontend::System, false,
986                  !(*it)->getOption().matches(OPT_iwithsysroot));
987   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
988          ie = Args.filtered_end(); it != ie; ++it)
989     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
990 
991   // Add the paths for the various language specific isystem flags.
992   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
993        ie = Args.filtered_end(); it != ie; ++it)
994     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
995   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
996        ie = Args.filtered_end(); it != ie; ++it)
997     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
998   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
999        ie = Args.filtered_end(); it != ie; ++it)
1000     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
1001   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
1002        ie = Args.filtered_end(); it != ie; ++it)
1003     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
1004 
1005   // Add the internal paths from a driver that detects standard include paths.
1006   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
1007                                             OPT_internal_externc_isystem),
1008                     E = Args.filtered_end();
1009        I != E; ++I) {
1010     frontend::IncludeDirGroup Group = frontend::System;
1011     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
1012       Group = frontend::ExternCSystem;
1013     Opts.AddPath((*I)->getValue(), Group, false, true);
1014   }
1015 
1016   // Add the path prefixes which are implicitly treated as being system headers.
1017   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
1018                                             OPT_ino_system_prefix),
1019                     E = Args.filtered_end();
1020        I != E; ++I)
1021     Opts.AddSystemHeaderPrefix((*I)->getValue(),
1022                                (*I)->getOption().matches(OPT_isystem_prefix));
1023 }
1024 
1025 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1026                                          LangStandard::Kind LangStd) {
1027   // Set some properties which depend solely on the input kind; it would be nice
1028   // to move these to the language standard, and have the driver resolve the
1029   // input kind + language standard.
1030   if (IK == IK_Asm) {
1031     Opts.AsmPreprocessor = 1;
1032   } else if (IK == IK_ObjC ||
1033              IK == IK_ObjCXX ||
1034              IK == IK_PreprocessedObjC ||
1035              IK == IK_PreprocessedObjCXX) {
1036     Opts.ObjC1 = Opts.ObjC2 = 1;
1037   }
1038 
1039   if (LangStd == LangStandard::lang_unspecified) {
1040     // Based on the base language, pick one.
1041     switch (IK) {
1042     case IK_None:
1043     case IK_AST:
1044     case IK_LLVM_IR:
1045       llvm_unreachable("Invalid input kind!");
1046     case IK_OpenCL:
1047       LangStd = LangStandard::lang_opencl;
1048       break;
1049     case IK_CUDA:
1050       LangStd = LangStandard::lang_cuda;
1051       break;
1052     case IK_Asm:
1053     case IK_C:
1054     case IK_PreprocessedC:
1055     case IK_ObjC:
1056     case IK_PreprocessedObjC:
1057       LangStd = LangStandard::lang_gnu99;
1058       break;
1059     case IK_CXX:
1060     case IK_PreprocessedCXX:
1061     case IK_ObjCXX:
1062     case IK_PreprocessedObjCXX:
1063       LangStd = LangStandard::lang_gnucxx98;
1064       break;
1065     }
1066   }
1067 
1068   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1069   Opts.LineComment = Std.hasLineComments();
1070   Opts.C99 = Std.isC99();
1071   Opts.C11 = Std.isC11();
1072   Opts.CPlusPlus = Std.isCPlusPlus();
1073   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1074   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1075   Opts.Digraphs = Std.hasDigraphs();
1076   Opts.GNUMode = Std.isGNUMode();
1077   Opts.GNUInline = !Std.isC99();
1078   Opts.HexFloats = Std.hasHexFloats();
1079   Opts.ImplicitInt = Std.hasImplicitInt();
1080 
1081   // Set OpenCL Version.
1082   if (LangStd == LangStandard::lang_opencl) {
1083     Opts.OpenCL = 1;
1084     Opts.OpenCLVersion = 100;
1085   }
1086   else if (LangStd == LangStandard::lang_opencl11) {
1087       Opts.OpenCL = 1;
1088       Opts.OpenCLVersion = 110;
1089   }
1090   else if (LangStd == LangStandard::lang_opencl12) {
1091     Opts.OpenCL = 1;
1092     Opts.OpenCLVersion = 120;
1093   }
1094 
1095   // OpenCL has some additional defaults.
1096   if (Opts.OpenCL) {
1097     Opts.AltiVec = 0;
1098     Opts.CXXOperatorNames = 1;
1099     Opts.LaxVectorConversions = 0;
1100     Opts.DefaultFPContract = 1;
1101     Opts.NativeHalfType = 1;
1102   }
1103 
1104   if (LangStd == LangStandard::lang_cuda)
1105     Opts.CUDA = 1;
1106 
1107   // OpenCL and C++ both have bool, true, false keywords.
1108   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1109 
1110   // C++ has wchar_t keyword.
1111   Opts.WChar = Opts.CPlusPlus;
1112 
1113   Opts.GNUKeywords = Opts.GNUMode;
1114   Opts.CXXOperatorNames = Opts.CPlusPlus;
1115 
1116   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1117   // is specified, or -std is set to a conforming mode.
1118   Opts.Trigraphs = !Opts.GNUMode;
1119 
1120   Opts.DollarIdents = !Opts.AsmPreprocessor;
1121 
1122   // C++1y onwards has sized global deallocation functions.
1123   Opts.SizedDeallocation = Opts.CPlusPlus1y;
1124 }
1125 
1126 /// Attempt to parse a visibility value out of the given argument.
1127 static Visibility parseVisibility(Arg *arg, ArgList &args,
1128                                   DiagnosticsEngine &diags) {
1129   StringRef value = arg->getValue();
1130   if (value == "default") {
1131     return DefaultVisibility;
1132   } else if (value == "hidden") {
1133     return HiddenVisibility;
1134   } else if (value == "protected") {
1135     // FIXME: diagnose if target does not support protected visibility
1136     return ProtectedVisibility;
1137   }
1138 
1139   diags.Report(diag::err_drv_invalid_value)
1140     << arg->getAsString(args) << value;
1141   return DefaultVisibility;
1142 }
1143 
1144 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1145                           DiagnosticsEngine &Diags) {
1146   // FIXME: Cleanup per-file based stuff.
1147   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1148   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1149     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1150 #define LANGSTANDARD(id, name, desc, features) \
1151       .Case(name, LangStandard::lang_##id)
1152 #include "clang/Frontend/LangStandards.def"
1153       .Default(LangStandard::lang_unspecified);
1154     if (LangStd == LangStandard::lang_unspecified)
1155       Diags.Report(diag::err_drv_invalid_value)
1156         << A->getAsString(Args) << A->getValue();
1157     else {
1158       // Valid standard, check to make sure language and standard are
1159       // compatible.
1160       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1161       switch (IK) {
1162       case IK_C:
1163       case IK_ObjC:
1164       case IK_PreprocessedC:
1165       case IK_PreprocessedObjC:
1166         if (!(Std.isC89() || Std.isC99()))
1167           Diags.Report(diag::err_drv_argument_not_allowed_with)
1168             << A->getAsString(Args) << "C/ObjC";
1169         break;
1170       case IK_CXX:
1171       case IK_ObjCXX:
1172       case IK_PreprocessedCXX:
1173       case IK_PreprocessedObjCXX:
1174         if (!Std.isCPlusPlus())
1175           Diags.Report(diag::err_drv_argument_not_allowed_with)
1176             << A->getAsString(Args) << "C++/ObjC++";
1177         break;
1178       case IK_OpenCL:
1179         if (!Std.isC99())
1180           Diags.Report(diag::err_drv_argument_not_allowed_with)
1181             << A->getAsString(Args) << "OpenCL";
1182         break;
1183       case IK_CUDA:
1184         if (!Std.isCPlusPlus())
1185           Diags.Report(diag::err_drv_argument_not_allowed_with)
1186             << A->getAsString(Args) << "CUDA";
1187         break;
1188       default:
1189         break;
1190       }
1191     }
1192   }
1193 
1194   // -cl-std only applies for OpenCL language standards.
1195   // Override the -std option in this case.
1196   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1197     LangStandard::Kind OpenCLLangStd
1198     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1199     .Case("CL", LangStandard::lang_opencl)
1200     .Case("CL1.1", LangStandard::lang_opencl11)
1201     .Case("CL1.2", LangStandard::lang_opencl12)
1202     .Default(LangStandard::lang_unspecified);
1203 
1204     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1205       Diags.Report(diag::err_drv_invalid_value)
1206       << A->getAsString(Args) << A->getValue();
1207     }
1208     else
1209       LangStd = OpenCLLangStd;
1210   }
1211 
1212   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1213 
1214   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1215   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1216   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1217   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1218   // name, as it doesn't seem a useful distinction.
1219   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1220                                   Opts.GNUKeywords);
1221 
1222   if (Args.hasArg(OPT_fno_operator_names))
1223     Opts.CXXOperatorNames = 0;
1224 
1225   if (Opts.ObjC1) {
1226     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1227       StringRef value = arg->getValue();
1228       if (Opts.ObjCRuntime.tryParse(value))
1229         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1230     }
1231 
1232     if (Args.hasArg(OPT_fobjc_gc_only))
1233       Opts.setGC(LangOptions::GCOnly);
1234     else if (Args.hasArg(OPT_fobjc_gc))
1235       Opts.setGC(LangOptions::HybridGC);
1236     else if (Args.hasArg(OPT_fobjc_arc)) {
1237       Opts.ObjCAutoRefCount = 1;
1238       if (!Opts.ObjCRuntime.allowsARC())
1239         Diags.Report(diag::err_arc_unsupported_on_runtime);
1240 
1241       // Only set ObjCARCWeak if ARC is enabled.
1242       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1243         Opts.ObjCARCWeak = 1;
1244       else
1245         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1246     }
1247 
1248     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1249       Opts.ObjCInferRelatedResultType = 0;
1250 
1251     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1252       Opts.ObjCSubscriptingLegacyRuntime =
1253         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1254   }
1255 
1256   if (Args.hasArg(OPT_fgnu89_inline))
1257     Opts.GNUInline = 1;
1258 
1259   if (Args.hasArg(OPT_fapple_kext)) {
1260     if (!Opts.CPlusPlus)
1261       Diags.Report(diag::warn_c_kext);
1262     else
1263       Opts.AppleKext = 1;
1264   }
1265 
1266   if (Args.hasArg(OPT_print_ivar_layout))
1267     Opts.ObjCGCBitmapPrint = 1;
1268   if (Args.hasArg(OPT_fno_constant_cfstrings))
1269     Opts.NoConstantCFStrings = 1;
1270 
1271   if (Args.hasArg(OPT_faltivec))
1272     Opts.AltiVec = 1;
1273 
1274   if (Args.hasArg(OPT_pthread))
1275     Opts.POSIXThreads = 1;
1276 
1277   // The value-visibility mode defaults to "default".
1278   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1279     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1280   } else {
1281     Opts.setValueVisibilityMode(DefaultVisibility);
1282   }
1283 
1284   // The type-visibility mode defaults to the value-visibility mode.
1285   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1286     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1287   } else {
1288     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1289   }
1290 
1291   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1292     Opts.InlineVisibilityHidden = 1;
1293 
1294   if (Args.hasArg(OPT_ftrapv)) {
1295     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1296     // Set the handler, if one is specified.
1297     Opts.OverflowHandler =
1298         Args.getLastArgValue(OPT_ftrapv_handler);
1299   }
1300   else if (Args.hasArg(OPT_fwrapv))
1301     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1302 
1303   if (Args.hasArg(OPT_trigraphs))
1304     Opts.Trigraphs = 1;
1305 
1306   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1307                                    OPT_fno_dollars_in_identifiers,
1308                                    Opts.DollarIdents);
1309   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1310   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1311   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1312   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1313   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1314   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1315   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1316   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1317   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1318                                    Opts.ConstStrings);
1319   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1320     Opts.LaxVectorConversions = 0;
1321   if (Args.hasArg(OPT_fno_threadsafe_statics))
1322     Opts.ThreadsafeStatics = 0;
1323   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1324   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1325   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1326   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1327   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1328 
1329   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1330   Opts.Blocks = Args.hasArg(OPT_fblocks);
1331   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1332   Opts.Modules = Args.hasArg(OPT_fmodules);
1333   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1334   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1335   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1336   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1337   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1338   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1339   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1340   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1341   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1342   Opts.SizedDeallocation |= Args.hasArg(OPT_fsized_deallocation);
1343   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1344   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1345   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1346   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1347   Opts.InstantiationDepth =
1348       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1349   Opts.ArrowDepth =
1350       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1351   Opts.ConstexprCallDepth =
1352       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1353   Opts.ConstexprStepLimit =
1354       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1355   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1356   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1357   Opts.NumLargeByValueCopy =
1358       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1359   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1360   Opts.ObjCConstantStringClass =
1361     Args.getLastArgValue(OPT_fconstant_string_class);
1362   Opts.ObjCDefaultSynthProperties =
1363     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1364   Opts.EncodeExtendedBlockSig =
1365     Args.hasArg(OPT_fencode_extended_block_signature);
1366   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1367   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1368   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1369   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1370   Opts.Static = Args.hasArg(OPT_static_define);
1371   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1372   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1373                         || Args.hasArg(OPT_fdump_record_layouts);
1374   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1375   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1376   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1377   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1378   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1379   Opts.MRTD = Args.hasArg(OPT_mrtd);
1380   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1381   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1382   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1383   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1384   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1385   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1386   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1387   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1388 
1389   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1390     switch (llvm::StringSwitch<unsigned>(A->getValue())
1391       .Case("target", LangOptions::ASMM_Target)
1392       .Case("no", LangOptions::ASMM_Off)
1393       .Case("yes", LangOptions::ASMM_On)
1394       .Default(255)) {
1395     default:
1396       Diags.Report(diag::err_drv_invalid_value)
1397         << "-faddress-space-map-mangling=" << A->getValue();
1398       break;
1399     case LangOptions::ASMM_Target:
1400       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1401       break;
1402     case LangOptions::ASMM_On:
1403       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1404       break;
1405     case LangOptions::ASMM_Off:
1406       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1407       break;
1408     }
1409   }
1410 
1411   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
1412     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
1413         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
1414             A->getValue())
1415             .Case("single",
1416                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
1417             .Case("multiple",
1418                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
1419             .Case("virtual",
1420                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
1421             .Default(LangOptions::PPTMK_BestCase);
1422     if (InheritanceModel == LangOptions::PPTMK_BestCase)
1423       Diags.Report(diag::err_drv_invalid_value)
1424           << "-fms-memptr-rep=" << A->getValue();
1425 
1426     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
1427   }
1428 
1429   // Check if -fopenmp is specified.
1430   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1431 
1432   // Record whether the __DEPRECATED define was requested.
1433   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1434                                  OPT_fno_deprecated_macro,
1435                                  Opts.Deprecated);
1436 
1437   // FIXME: Eliminate this dependency.
1438   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1439        OptSize = getOptimizationLevelSize(Args);
1440   Opts.Optimize = Opt != 0;
1441   Opts.OptimizeSize = OptSize != 0;
1442 
1443   // This is the __NO_INLINE__ define, which just depends on things like the
1444   // optimization level and -fno-inline, not actually whether the backend has
1445   // inlining enabled.
1446   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1447 
1448   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1449   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1450 
1451   Opts.RetainCommentsFromSystemHeaders =
1452       Args.hasArg(OPT_fretain_comments_from_system_headers);
1453 
1454   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1455   switch (SSP) {
1456   default:
1457     Diags.Report(diag::err_drv_invalid_value)
1458       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1459     break;
1460   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1461   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1462   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
1463   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
1464   }
1465 
1466   // Parse -fsanitize= arguments.
1467   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1468   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1469     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1470     // efficiently map string values to them. Perform the mapping indirectly:
1471     // convert strings to enumerated values, then switch over the enum to set
1472     // the right bitfield value.
1473     enum Sanitizer {
1474 #define SANITIZER(NAME, ID) \
1475       ID,
1476 #include "clang/Basic/Sanitizers.def"
1477       Unknown
1478     };
1479     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1480 #define SANITIZER(NAME, ID) \
1481               .Case(NAME, ID)
1482 #include "clang/Basic/Sanitizers.def"
1483               .Default(Unknown)) {
1484 #define SANITIZER(NAME, ID) \
1485     case ID: \
1486       Opts.Sanitize.ID = true; \
1487       break;
1488 #include "clang/Basic/Sanitizers.def"
1489 
1490     case Unknown:
1491       Diags.Report(diag::err_drv_invalid_value)
1492         << "-fsanitize=" << Sanitizers[I];
1493       break;
1494     }
1495   }
1496 }
1497 
1498 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1499                                   FileManager &FileMgr,
1500                                   DiagnosticsEngine &Diags) {
1501   using namespace options;
1502   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1503   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1504   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1505       Opts.TokenCache = A->getValue();
1506   else
1507     Opts.TokenCache = Opts.ImplicitPTHInclude;
1508   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1509   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1510   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1511 
1512   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1513   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1514          ie = Args.filtered_end(); it != ie; ++it) {
1515     const Arg *A = *it;
1516     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1517   }
1518 
1519   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1520     StringRef Value(A->getValue());
1521     size_t Comma = Value.find(',');
1522     unsigned Bytes = 0;
1523     unsigned EndOfLine = 0;
1524 
1525     if (Comma == StringRef::npos ||
1526         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1527         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1528       Diags.Report(diag::err_drv_preamble_format);
1529     else {
1530       Opts.PrecompiledPreambleBytes.first = Bytes;
1531       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1532     }
1533   }
1534 
1535   // Add macros from the command line.
1536   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1537          ie = Args.filtered_end(); it != ie; ++it) {
1538     if ((*it)->getOption().matches(OPT_D))
1539       Opts.addMacroDef((*it)->getValue());
1540     else
1541       Opts.addMacroUndef((*it)->getValue());
1542   }
1543 
1544   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1545 
1546   // Add the ordered list of -includes.
1547   for (arg_iterator it = Args.filtered_begin(OPT_include),
1548          ie = Args.filtered_end(); it != ie; ++it) {
1549     const Arg *A = *it;
1550     Opts.Includes.push_back(A->getValue());
1551   }
1552 
1553   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1554          ie = Args.filtered_end(); it != ie; ++it) {
1555     const Arg *A = *it;
1556     Opts.ChainedIncludes.push_back(A->getValue());
1557   }
1558 
1559   // Include 'altivec.h' if -faltivec option present
1560   if (Args.hasArg(OPT_faltivec))
1561     Opts.Includes.push_back("altivec.h");
1562 
1563   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1564          ie = Args.filtered_end(); it != ie; ++it) {
1565     const Arg *A = *it;
1566     std::pair<StringRef,StringRef> Split =
1567       StringRef(A->getValue()).split(';');
1568 
1569     if (Split.second.empty()) {
1570       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1571       continue;
1572     }
1573 
1574     Opts.addRemappedFile(Split.first, Split.second);
1575   }
1576 
1577   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1578     StringRef Name = A->getValue();
1579     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1580       .Case("libc++", ARCXX_libcxx)
1581       .Case("libstdc++", ARCXX_libstdcxx)
1582       .Case("none", ARCXX_nolib)
1583       .Default(~0U);
1584     if (Library == ~0U)
1585       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1586     else
1587       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1588   }
1589 }
1590 
1591 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1592                                         ArgList &Args,
1593                                         frontend::ActionKind Action) {
1594   using namespace options;
1595 
1596   switch (Action) {
1597   case frontend::ASTDeclList:
1598   case frontend::ASTDump:
1599   case frontend::ASTPrint:
1600   case frontend::ASTView:
1601   case frontend::EmitAssembly:
1602   case frontend::EmitBC:
1603   case frontend::EmitHTML:
1604   case frontend::EmitLLVM:
1605   case frontend::EmitLLVMOnly:
1606   case frontend::EmitCodeGenOnly:
1607   case frontend::EmitObj:
1608   case frontend::FixIt:
1609   case frontend::GenerateModule:
1610   case frontend::GeneratePCH:
1611   case frontend::GeneratePTH:
1612   case frontend::ParseSyntaxOnly:
1613   case frontend::ModuleFileInfo:
1614   case frontend::VerifyPCH:
1615   case frontend::PluginAction:
1616   case frontend::PrintDeclContext:
1617   case frontend::RewriteObjC:
1618   case frontend::RewriteTest:
1619   case frontend::RunAnalysis:
1620   case frontend::MigrateSource:
1621     Opts.ShowCPP = 0;
1622     break;
1623 
1624   case frontend::DumpRawTokens:
1625   case frontend::DumpTokens:
1626   case frontend::InitOnly:
1627   case frontend::PrintPreamble:
1628   case frontend::PrintPreprocessedInput:
1629   case frontend::RewriteMacros:
1630   case frontend::RunPreprocessorOnly:
1631     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1632     break;
1633   }
1634 
1635   Opts.ShowComments = Args.hasArg(OPT_C);
1636   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1637   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1638   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1639   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1640 }
1641 
1642 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1643   using namespace options;
1644   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1645   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1646   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1647   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1648   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1649   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1650 
1651   // Use the default target triple if unspecified.
1652   if (Opts.Triple.empty())
1653     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1654 }
1655 
1656 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1657                                         const char *const *ArgBegin,
1658                                         const char *const *ArgEnd,
1659                                         DiagnosticsEngine &Diags) {
1660   bool Success = true;
1661 
1662   // Parse the arguments.
1663   OwningPtr<OptTable> Opts(createDriverOptTable());
1664   const unsigned IncludedFlagsBitmask = options::CC1Option;
1665   unsigned MissingArgIndex, MissingArgCount;
1666   OwningPtr<InputArgList> Args(
1667     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1668                     IncludedFlagsBitmask));
1669 
1670   // Check for missing argument error.
1671   if (MissingArgCount) {
1672     Diags.Report(diag::err_drv_missing_argument)
1673       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1674     Success = false;
1675   }
1676 
1677   // Issue errors on unknown arguments.
1678   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1679          ie = Args->filtered_end(); it != ie; ++it) {
1680     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1681     Success = false;
1682   }
1683 
1684   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1685   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1686   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1687   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1688             && Success;
1689   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1690   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1691   // FIXME: We shouldn't have to pass the DashX option around here
1692   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1693   ParseTargetArgs(Res.getTargetOpts(), *Args);
1694   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags,
1695                              Res.getTargetOpts()) && Success;
1696   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1697   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1698     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1699     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1700       Res.getLangOpts()->ObjCExceptions = 1;
1701   }
1702   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1703   // PCH file and find the original header name. Remove the need to do that in
1704   // ParsePreprocessorArgs and remove the FileManager
1705   // parameters from the function and the "FileManager.h" #include.
1706   FileManager FileMgr(Res.getFileSystemOpts());
1707   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1708   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1709                               Res.getFrontendOpts().ProgramAction);
1710   return Success;
1711 }
1712 
1713 namespace {
1714 
1715   class ModuleSignature {
1716     SmallVector<uint64_t, 16> Data;
1717     unsigned CurBit;
1718     uint64_t CurValue;
1719 
1720   public:
1721     ModuleSignature() : CurBit(0), CurValue(0) { }
1722 
1723     void add(uint64_t Value, unsigned Bits);
1724     void add(StringRef Value);
1725     void flush();
1726 
1727     llvm::APInt getAsInteger() const;
1728   };
1729 }
1730 
1731 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1732   CurValue |= Value << CurBit;
1733   if (CurBit + NumBits < 64) {
1734     CurBit += NumBits;
1735     return;
1736   }
1737 
1738   // Add the current word.
1739   Data.push_back(CurValue);
1740 
1741   if (CurBit)
1742     CurValue = Value >> (64-CurBit);
1743   else
1744     CurValue = 0;
1745   CurBit = (CurBit+NumBits) & 63;
1746 }
1747 
1748 void ModuleSignature::flush() {
1749   if (CurBit == 0)
1750     return;
1751 
1752   Data.push_back(CurValue);
1753   CurBit = 0;
1754   CurValue = 0;
1755 }
1756 
1757 void ModuleSignature::add(StringRef Value) {
1758   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1759     add(*I, 8);
1760 }
1761 
1762 llvm::APInt ModuleSignature::getAsInteger() const {
1763   return llvm::APInt(Data.size() * 64, Data);
1764 }
1765 
1766 std::string CompilerInvocation::getModuleHash() const {
1767   // Note: For QoI reasons, the things we use as a hash here should all be
1768   // dumped via the -module-info flag.
1769   using llvm::hash_code;
1770   using llvm::hash_value;
1771   using llvm::hash_combine;
1772 
1773   // Start the signature with the compiler version.
1774   // FIXME: We'd rather use something more cryptographically sound than
1775   // CityHash, but this will do for now.
1776   hash_code code = hash_value(getClangFullRepositoryVersion());
1777 
1778   // Extend the signature with the language options
1779 #define LANGOPT(Name, Bits, Default, Description) \
1780    code = hash_combine(code, LangOpts->Name);
1781 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1782   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1783 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1784 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1785 #include "clang/Basic/LangOptions.def"
1786 
1787   // Extend the signature with the target options.
1788   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1789                       TargetOpts->ABI, TargetOpts->LinkerVersion);
1790   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1791     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1792 
1793   // Extend the signature with preprocessor options.
1794   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1795   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1796   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1797 
1798   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1799             I = getPreprocessorOpts().Macros.begin(),
1800          IEnd = getPreprocessorOpts().Macros.end();
1801        I != IEnd; ++I) {
1802     // If we're supposed to ignore this macro for the purposes of modules,
1803     // don't put it into the hash.
1804     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1805       // Check whether we're ignoring this macro.
1806       StringRef MacroDef = I->first;
1807       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1808         continue;
1809     }
1810 
1811     code = hash_combine(code, I->first, I->second);
1812   }
1813 
1814   // Extend the signature with the sysroot.
1815   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1816                       hsOpts.UseStandardSystemIncludes,
1817                       hsOpts.UseStandardCXXIncludes,
1818                       hsOpts.UseLibcxx);
1819 
1820   // Darwin-specific hack: if we have a sysroot, use the contents and
1821   // modification time of
1822   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1823   // as part of the module hash.
1824   if (!hsOpts.Sysroot.empty()) {
1825     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1826     SmallString<128> systemVersionFile;
1827     systemVersionFile += hsOpts.Sysroot;
1828     llvm::sys::path::append(systemVersionFile, "System");
1829     llvm::sys::path::append(systemVersionFile, "Library");
1830     llvm::sys::path::append(systemVersionFile, "CoreServices");
1831     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1832     if (!llvm::MemoryBuffer::getFile(systemVersionFile.str(), buffer)) {
1833       code = hash_combine(code, buffer.get()->getBuffer());
1834 
1835       struct stat statBuf;
1836       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1837         code = hash_combine(code, statBuf.st_mtime);
1838     }
1839   }
1840 
1841   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1842 }
1843 
1844 namespace clang {
1845 
1846 template<typename IntTy>
1847 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
1848                                     IntTy Default,
1849                                     DiagnosticsEngine *Diags) {
1850   IntTy Res = Default;
1851   if (Arg *A = Args.getLastArg(Id)) {
1852     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1853       if (Diags)
1854         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1855                                                        << A->getValue();
1856     }
1857   }
1858   return Res;
1859 }
1860 
1861 
1862 // Declared in clang/Frontend/Utils.h.
1863 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1864                        DiagnosticsEngine *Diags) {
1865   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
1866 }
1867 
1868 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
1869                                uint64_t Default,
1870                                DiagnosticsEngine *Diags) {
1871   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
1872 }
1873 
1874 void BuryPointer(const void *Ptr) {
1875   // This function may be called only a small fixed amount of times per each
1876   // invocation, otherwise we do actually have a leak which we want to report.
1877   // If this function is called more than kGraveYardMaxSize times, the pointers
1878   // will not be properly buried and a leak detector will report a leak, which
1879   // is what we want in such case.
1880   static const size_t kGraveYardMaxSize = 16;
1881   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
1882   static llvm::sys::cas_flag GraveYardSize;
1883   llvm::sys::cas_flag Idx = llvm::sys::AtomicIncrement(&GraveYardSize) - 1;
1884   if (Idx >= kGraveYardMaxSize)
1885     return;
1886   GraveYard[Idx] = Ptr;
1887 }
1888 }
1889