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/SmallVector.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringSwitch.h"
25 #include "llvm/ADT/Triple.h"
26 #include "llvm/Option/Arg.h"
27 #include "llvm/Option/ArgList.h"
28 #include "llvm/Option/OptTable.h"
29 #include "llvm/Option/Option.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/FileSystem.h"
32 #include "llvm/Support/Host.h"
33 #include "llvm/Support/Path.h"
34 #include "llvm/Support/Process.h"
35 #include "llvm/Support/system_error.h"
36 #include <atomic>
37 #include <memory>
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       std::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.CompressDebugSections = Args.hasArg(OPT_compress_debug_sections);
451   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
452   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
453   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
454   Opts.SanitizeMemoryTrackOrigins =
455       getLastArgIntValue(Args, OPT_fsanitize_memory_track_origins_EQ, 0, Diags);
456   Opts.SanitizeUndefinedTrapOnError =
457       Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
458   Opts.SSPBufferSize =
459       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
460   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
461   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
462     StringRef Val = A->getValue();
463     unsigned StackAlignment = Opts.StackAlignment;
464     Val.getAsInteger(10, StackAlignment);
465     Opts.StackAlignment = StackAlignment;
466   }
467 
468   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
469     StringRef Name = A->getValue();
470     unsigned Method = llvm::StringSwitch<unsigned>(Name)
471       .Case("legacy", CodeGenOptions::Legacy)
472       .Case("non-legacy", CodeGenOptions::NonLegacy)
473       .Case("mixed", CodeGenOptions::Mixed)
474       .Default(~0U);
475     if (Method == ~0U) {
476       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
477       Success = false;
478     } else {
479       Opts.setObjCDispatchMethod(
480         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
481     }
482   }
483 
484   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
485     StringRef Name = A->getValue();
486     unsigned Model = llvm::StringSwitch<unsigned>(Name)
487         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
488         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
489         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
490         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
491         .Default(~0U);
492     if (Model == ~0U) {
493       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
494       Success = false;
495     } else {
496       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
497     }
498   }
499 
500   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
501     StringRef Val = A->getValue();
502     if (Val == "fast")
503       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
504     else if (Val == "on")
505       Opts.setFPContractMode(CodeGenOptions::FPC_On);
506     else if (Val == "off")
507       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
508     else
509       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
510   }
511 
512   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
513     if (A->getOption().matches(OPT_fpcc_struct_return)) {
514       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
515     } else {
516       assert(A->getOption().matches(OPT_freg_struct_return));
517       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
518     }
519   }
520 
521   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
522 
523   return Success;
524 }
525 
526 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
527                                       ArgList &Args) {
528   using namespace options;
529   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
530   Opts.Targets = Args.getAllArgValues(OPT_MT);
531   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
532   Opts.IncludeModuleFiles = Args.hasArg(OPT_module_file_deps);
533   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
534   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
535   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
536   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
537   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
538   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
539 }
540 
541 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
542                                 DiagnosticsEngine *Diags) {
543   using namespace options;
544   bool Success = true;
545 
546   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
547   Opts.DiagnosticSerializationFile =
548     Args.getLastArgValue(OPT_diagnostic_serialized_file);
549   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
550   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
551   Opts.Pedantic = Args.hasArg(OPT_pedantic);
552   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
553   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
554   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
555   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
556                                  OPT_fno_show_column,
557                                  /*Default=*/true);
558   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
559   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
560   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
561 
562   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
563 
564   // Default behavior is to not to show note include stacks.
565   Opts.ShowNoteIncludeStack = false;
566   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
567                                OPT_fno_diagnostics_show_note_include_stack))
568     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
569       Opts.ShowNoteIncludeStack = true;
570 
571   StringRef ShowOverloads =
572     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
573   if (ShowOverloads == "best")
574     Opts.setShowOverloads(Ovl_Best);
575   else if (ShowOverloads == "all")
576     Opts.setShowOverloads(Ovl_All);
577   else {
578     Success = false;
579     if (Diags)
580       Diags->Report(diag::err_drv_invalid_value)
581       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
582       << ShowOverloads;
583   }
584 
585   StringRef ShowCategory =
586     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
587   if (ShowCategory == "none")
588     Opts.ShowCategories = 0;
589   else if (ShowCategory == "id")
590     Opts.ShowCategories = 1;
591   else if (ShowCategory == "name")
592     Opts.ShowCategories = 2;
593   else {
594     Success = false;
595     if (Diags)
596       Diags->Report(diag::err_drv_invalid_value)
597       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
598       << ShowCategory;
599   }
600 
601   StringRef Format =
602     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
603   if (Format == "clang")
604     Opts.setFormat(DiagnosticOptions::Clang);
605   else if (Format == "msvc")
606     Opts.setFormat(DiagnosticOptions::Msvc);
607   else if (Format == "msvc-fallback") {
608     Opts.setFormat(DiagnosticOptions::Msvc);
609     Opts.CLFallbackMode = true;
610   } else if (Format == "vi")
611     Opts.setFormat(DiagnosticOptions::Vi);
612   else {
613     Success = false;
614     if (Diags)
615       Diags->Report(diag::err_drv_invalid_value)
616       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
617       << Format;
618   }
619 
620   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
621   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
622   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
623   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
624   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
625   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
626   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
627   Opts.MacroBacktraceLimit =
628       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
629                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
630   Opts.TemplateBacktraceLimit = getLastArgIntValue(
631       Args, OPT_ftemplate_backtrace_limit,
632       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
633   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
634       Args, OPT_fconstexpr_backtrace_limit,
635       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
636   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
637                                     DiagnosticOptions::DefaultTabStop, Diags);
638   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
639     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
640     if (Diags)
641       Diags->Report(diag::warn_ignoring_ftabstop_value)
642       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
643   }
644   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
645   addWarningArgs(Args, Opts.Warnings);
646 
647   return Success;
648 }
649 
650 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
651   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
652 }
653 
654 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
655                                    DiagnosticsEngine &Diags) {
656   using namespace options;
657   Opts.ProgramAction = frontend::ParseSyntaxOnly;
658   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
659     switch (A->getOption().getID()) {
660     default:
661       llvm_unreachable("Invalid option in group!");
662     case OPT_ast_list:
663       Opts.ProgramAction = frontend::ASTDeclList; break;
664     case OPT_ast_dump:
665       Opts.ProgramAction = frontend::ASTDump; break;
666     case OPT_ast_print:
667       Opts.ProgramAction = frontend::ASTPrint; break;
668     case OPT_ast_view:
669       Opts.ProgramAction = frontend::ASTView; break;
670     case OPT_dump_raw_tokens:
671       Opts.ProgramAction = frontend::DumpRawTokens; break;
672     case OPT_dump_tokens:
673       Opts.ProgramAction = frontend::DumpTokens; break;
674     case OPT_S:
675       Opts.ProgramAction = frontend::EmitAssembly; break;
676     case OPT_emit_llvm_bc:
677       Opts.ProgramAction = frontend::EmitBC; break;
678     case OPT_emit_html:
679       Opts.ProgramAction = frontend::EmitHTML; break;
680     case OPT_emit_llvm:
681       Opts.ProgramAction = frontend::EmitLLVM; break;
682     case OPT_emit_llvm_only:
683       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
684     case OPT_emit_codegen_only:
685       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
686     case OPT_emit_obj:
687       Opts.ProgramAction = frontend::EmitObj; break;
688     case OPT_fixit_EQ:
689       Opts.FixItSuffix = A->getValue();
690       // fall-through!
691     case OPT_fixit:
692       Opts.ProgramAction = frontend::FixIt; break;
693     case OPT_emit_module:
694       Opts.ProgramAction = frontend::GenerateModule; break;
695     case OPT_emit_pch:
696       Opts.ProgramAction = frontend::GeneratePCH; break;
697     case OPT_emit_pth:
698       Opts.ProgramAction = frontend::GeneratePTH; break;
699     case OPT_init_only:
700       Opts.ProgramAction = frontend::InitOnly; break;
701     case OPT_fsyntax_only:
702       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
703     case OPT_module_file_info:
704       Opts.ProgramAction = frontend::ModuleFileInfo; break;
705     case OPT_verify_pch:
706       Opts.ProgramAction = frontend::VerifyPCH; break;
707     case OPT_print_decl_contexts:
708       Opts.ProgramAction = frontend::PrintDeclContext; break;
709     case OPT_print_preamble:
710       Opts.ProgramAction = frontend::PrintPreamble; break;
711     case OPT_E:
712       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
713     case OPT_rewrite_macros:
714       Opts.ProgramAction = frontend::RewriteMacros; break;
715     case OPT_rewrite_objc:
716       Opts.ProgramAction = frontend::RewriteObjC; break;
717     case OPT_rewrite_test:
718       Opts.ProgramAction = frontend::RewriteTest; break;
719     case OPT_analyze:
720       Opts.ProgramAction = frontend::RunAnalysis; break;
721     case OPT_migrate:
722       Opts.ProgramAction = frontend::MigrateSource; break;
723     case OPT_Eonly:
724       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
725     }
726   }
727 
728   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
729     Opts.Plugins.push_back(A->getValue(0));
730     Opts.ProgramAction = frontend::PluginAction;
731     Opts.ActionName = A->getValue();
732 
733     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
734            end = Args.filtered_end(); it != end; ++it) {
735       if ((*it)->getValue(0) == Opts.ActionName)
736         Opts.PluginArgs.push_back((*it)->getValue(1));
737     }
738   }
739 
740   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
741   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
742   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
743     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
744            end = Args.filtered_end(); it != end; ++it) {
745       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
746         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
747     }
748   }
749 
750   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
751     Opts.CodeCompletionAt =
752       ParsedSourceLocation::FromString(A->getValue());
753     if (Opts.CodeCompletionAt.FileName.empty())
754       Diags.Report(diag::err_drv_invalid_value)
755         << A->getAsString(Args) << A->getValue();
756   }
757   Opts.DisableFree = Args.hasArg(OPT_disable_free);
758 
759   Opts.OutputFile = Args.getLastArgValue(OPT_o);
760   Opts.Plugins = Args.getAllArgValues(OPT_load);
761   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
762   Opts.ShowHelp = Args.hasArg(OPT_help);
763   Opts.ShowStats = Args.hasArg(OPT_print_stats);
764   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
765   Opts.ShowVersion = Args.hasArg(OPT_version);
766   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
767   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
768   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
769   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
770   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
771   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
772   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
773   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
774   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
775   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
776 
777   Opts.CodeCompleteOpts.IncludeMacros
778     = Args.hasArg(OPT_code_completion_macros);
779   Opts.CodeCompleteOpts.IncludeCodePatterns
780     = Args.hasArg(OPT_code_completion_patterns);
781   Opts.CodeCompleteOpts.IncludeGlobals
782     = !Args.hasArg(OPT_no_code_completion_globals);
783   Opts.CodeCompleteOpts.IncludeBriefComments
784     = Args.hasArg(OPT_code_completion_brief_comments);
785 
786   Opts.OverrideRecordLayoutsFile
787     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
788   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
789                                      OPT_arcmt_modify,
790                                      OPT_arcmt_migrate)) {
791     switch (A->getOption().getID()) {
792     default:
793       llvm_unreachable("missed a case");
794     case OPT_arcmt_check:
795       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
796       break;
797     case OPT_arcmt_modify:
798       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
799       break;
800     case OPT_arcmt_migrate:
801       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
802       break;
803     }
804   }
805   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
806   Opts.ARCMTMigrateReportOut
807     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
808   Opts.ARCMTMigrateEmitARCErrors
809     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
810 
811   if (Args.hasArg(OPT_objcmt_migrate_literals))
812     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
813   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
814     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
815   if (Args.hasArg(OPT_objcmt_migrate_property))
816     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
817   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
818     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
819   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
820     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
821   if (Args.hasArg(OPT_objcmt_migrate_annotation))
822     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
823   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
824     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
825   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
826     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
827   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
828     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
829   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
830     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
831   if (Args.hasArg(OPT_objcmt_atomic_property))
832     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
833   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
834     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
835   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
836     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
837   if (Args.hasArg(OPT_objcmt_migrate_all))
838     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
839 
840   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
841 
842   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
843       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
844     Diags.Report(diag::err_drv_argument_not_allowed_with)
845       << "ARC migration" << "ObjC migration";
846   }
847 
848   InputKind DashX = IK_None;
849   if (const Arg *A = Args.getLastArg(OPT_x)) {
850     DashX = llvm::StringSwitch<InputKind>(A->getValue())
851       .Case("c", IK_C)
852       .Case("cl", IK_OpenCL)
853       .Case("cuda", IK_CUDA)
854       .Case("c++", IK_CXX)
855       .Case("objective-c", IK_ObjC)
856       .Case("objective-c++", IK_ObjCXX)
857       .Case("cpp-output", IK_PreprocessedC)
858       .Case("assembler-with-cpp", IK_Asm)
859       .Case("c++-cpp-output", IK_PreprocessedCXX)
860       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
861       .Case("objc-cpp-output", IK_PreprocessedObjC)
862       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
863       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
864       .Case("c-header", IK_C)
865       .Case("cl-header", IK_OpenCL)
866       .Case("objective-c-header", IK_ObjC)
867       .Case("c++-header", IK_CXX)
868       .Case("objective-c++-header", IK_ObjCXX)
869       .Cases("ast", "pcm", IK_AST)
870       .Case("ir", IK_LLVM_IR)
871       .Default(IK_None);
872     if (DashX == IK_None)
873       Diags.Report(diag::err_drv_invalid_value)
874         << A->getAsString(Args) << A->getValue();
875   }
876 
877   // '-' is the default input if none is given.
878   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
879   Opts.Inputs.clear();
880   if (Inputs.empty())
881     Inputs.push_back("-");
882   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
883     InputKind IK = DashX;
884     if (IK == IK_None) {
885       IK = FrontendOptions::getInputKindForExtension(
886         StringRef(Inputs[i]).rsplit('.').second);
887       // FIXME: Remove this hack.
888       if (i == 0)
889         DashX = IK;
890     }
891     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
892   }
893 
894   return DashX;
895 }
896 
897 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
898                                                  void *MainAddr) {
899   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
900 
901   if (!P.empty()) {
902     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
903     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
904 
905     // Get foo/lib/clang/<version>/include
906     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
907   }
908 
909   return P.str();
910 }
911 
912 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
913   using namespace options;
914   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
915   Opts.Verbose = Args.hasArg(OPT_v);
916   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
917   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
918   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
919   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
920     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
921   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
922   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
923   Opts.ModuleUserBuildPath = Args.getLastArgValue(OPT_fmodules_user_build_path);
924   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
925   // -fmodules implies -fmodule-maps
926   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
927   Opts.ModuleCachePruneInterval =
928       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
929   Opts.ModuleCachePruneAfter =
930       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
931   Opts.ModulesValidateOncePerBuildSession =
932       Args.hasArg(OPT_fmodules_validate_once_per_build_session);
933   Opts.BuildSessionTimestamp =
934       getLastArgUInt64Value(Args, OPT_fbuild_session_timestamp, 0);
935   Opts.ModulesValidateSystemHeaders =
936       Args.hasArg(OPT_fmodules_validate_system_headers);
937 
938   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
939                     ie = Args.filtered_end();
940        it != ie; ++it) {
941     StringRef MacroDef = (*it)->getValue();
942     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
943   }
944   std::vector<std::string> ModuleMapFiles =
945       Args.getAllArgValues(OPT_fmodule_map_file);
946   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
947 
948   // Add -I..., -F..., and -index-header-map options in order.
949   bool IsIndexHeaderMap = false;
950   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
951                                              OPT_index_header_map),
952        ie = Args.filtered_end(); it != ie; ++it) {
953     if ((*it)->getOption().matches(OPT_index_header_map)) {
954       // -index-header-map applies to the next -I or -F.
955       IsIndexHeaderMap = true;
956       continue;
957     }
958 
959     frontend::IncludeDirGroup Group
960       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
961 
962     Opts.AddPath((*it)->getValue(), Group,
963                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
964     IsIndexHeaderMap = false;
965   }
966 
967   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
968   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
969   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
970                                              OPT_iwithprefixbefore),
971          ie = Args.filtered_end(); it != ie; ++it) {
972     const Arg *A = *it;
973     if (A->getOption().matches(OPT_iprefix))
974       Prefix = A->getValue();
975     else if (A->getOption().matches(OPT_iwithprefix))
976       Opts.AddPath(Prefix.str() + A->getValue(),
977                    frontend::After, false, true);
978     else
979       Opts.AddPath(Prefix.str() + A->getValue(),
980                    frontend::Angled, false, true);
981   }
982 
983   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
984          ie = Args.filtered_end(); it != ie; ++it)
985     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
986   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
987          ie = Args.filtered_end(); it != ie; ++it)
988     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
989   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
990          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
991     Opts.AddPath((*it)->getValue(), frontend::System, false,
992                  !(*it)->getOption().matches(OPT_iwithsysroot));
993   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
994          ie = Args.filtered_end(); it != ie; ++it)
995     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
996 
997   // Add the paths for the various language specific isystem flags.
998   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
999        ie = Args.filtered_end(); it != ie; ++it)
1000     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
1001   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
1002        ie = Args.filtered_end(); it != ie; ++it)
1003     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
1004   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
1005        ie = Args.filtered_end(); it != ie; ++it)
1006     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
1007   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
1008        ie = Args.filtered_end(); it != ie; ++it)
1009     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
1010 
1011   // Add the internal paths from a driver that detects standard include paths.
1012   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
1013                                             OPT_internal_externc_isystem),
1014                     E = Args.filtered_end();
1015        I != E; ++I) {
1016     frontend::IncludeDirGroup Group = frontend::System;
1017     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
1018       Group = frontend::ExternCSystem;
1019     Opts.AddPath((*I)->getValue(), Group, false, true);
1020   }
1021 
1022   // Add the path prefixes which are implicitly treated as being system headers.
1023   for (arg_iterator I = Args.filtered_begin(OPT_system_header_prefix,
1024                                             OPT_no_system_header_prefix),
1025                     E = Args.filtered_end();
1026        I != E; ++I)
1027     Opts.AddSystemHeaderPrefix(
1028         (*I)->getValue(), (*I)->getOption().matches(OPT_system_header_prefix));
1029 
1030   for (arg_iterator I = Args.filtered_begin(OPT_ivfsoverlay),
1031        E = Args.filtered_end(); I != E; ++I)
1032     Opts.AddVFSOverlayFile((*I)->getValue());
1033 }
1034 
1035 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1036                                          LangStandard::Kind LangStd) {
1037   // Set some properties which depend solely on the input kind; it would be nice
1038   // to move these to the language standard, and have the driver resolve the
1039   // input kind + language standard.
1040   if (IK == IK_Asm) {
1041     Opts.AsmPreprocessor = 1;
1042   } else if (IK == IK_ObjC ||
1043              IK == IK_ObjCXX ||
1044              IK == IK_PreprocessedObjC ||
1045              IK == IK_PreprocessedObjCXX) {
1046     Opts.ObjC1 = Opts.ObjC2 = 1;
1047   }
1048 
1049   if (LangStd == LangStandard::lang_unspecified) {
1050     // Based on the base language, pick one.
1051     switch (IK) {
1052     case IK_None:
1053     case IK_AST:
1054     case IK_LLVM_IR:
1055       llvm_unreachable("Invalid input kind!");
1056     case IK_OpenCL:
1057       LangStd = LangStandard::lang_opencl;
1058       break;
1059     case IK_CUDA:
1060       LangStd = LangStandard::lang_cuda;
1061       break;
1062     case IK_Asm:
1063     case IK_C:
1064     case IK_PreprocessedC:
1065     case IK_ObjC:
1066     case IK_PreprocessedObjC:
1067       LangStd = LangStandard::lang_gnu99;
1068       break;
1069     case IK_CXX:
1070     case IK_PreprocessedCXX:
1071     case IK_ObjCXX:
1072     case IK_PreprocessedObjCXX:
1073       LangStd = LangStandard::lang_gnucxx98;
1074       break;
1075     }
1076   }
1077 
1078   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1079   Opts.LineComment = Std.hasLineComments();
1080   Opts.C99 = Std.isC99();
1081   Opts.C11 = Std.isC11();
1082   Opts.CPlusPlus = Std.isCPlusPlus();
1083   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1084   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1085   Opts.Digraphs = Std.hasDigraphs();
1086   Opts.GNUMode = Std.isGNUMode();
1087   Opts.GNUInline = !Std.isC99();
1088   Opts.HexFloats = Std.hasHexFloats();
1089   Opts.ImplicitInt = Std.hasImplicitInt();
1090 
1091   // Set OpenCL Version.
1092   if (LangStd == LangStandard::lang_opencl) {
1093     Opts.OpenCL = 1;
1094     Opts.OpenCLVersion = 100;
1095   }
1096   else if (LangStd == LangStandard::lang_opencl11) {
1097       Opts.OpenCL = 1;
1098       Opts.OpenCLVersion = 110;
1099   }
1100   else if (LangStd == LangStandard::lang_opencl12) {
1101     Opts.OpenCL = 1;
1102     Opts.OpenCLVersion = 120;
1103   }
1104 
1105   // OpenCL has some additional defaults.
1106   if (Opts.OpenCL) {
1107     Opts.AltiVec = 0;
1108     Opts.CXXOperatorNames = 1;
1109     Opts.LaxVectorConversions = 0;
1110     Opts.DefaultFPContract = 1;
1111     Opts.NativeHalfType = 1;
1112   }
1113 
1114   if (LangStd == LangStandard::lang_cuda)
1115     Opts.CUDA = 1;
1116 
1117   // OpenCL and C++ both have bool, true, false keywords.
1118   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1119 
1120   // OpenCL has half keyword
1121   Opts.Half = Opts.OpenCL;
1122 
1123   // C++ has wchar_t keyword.
1124   Opts.WChar = Opts.CPlusPlus;
1125 
1126   Opts.GNUKeywords = Opts.GNUMode;
1127   Opts.CXXOperatorNames = Opts.CPlusPlus;
1128 
1129   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1130   // is specified, or -std is set to a conforming mode.
1131   Opts.Trigraphs = !Opts.GNUMode;
1132 
1133   Opts.DollarIdents = !Opts.AsmPreprocessor;
1134 
1135   // C++1y onwards has sized global deallocation functions.
1136   Opts.SizedDeallocation = Opts.CPlusPlus1y;
1137 }
1138 
1139 /// Attempt to parse a visibility value out of the given argument.
1140 static Visibility parseVisibility(Arg *arg, ArgList &args,
1141                                   DiagnosticsEngine &diags) {
1142   StringRef value = arg->getValue();
1143   if (value == "default") {
1144     return DefaultVisibility;
1145   } else if (value == "hidden") {
1146     return HiddenVisibility;
1147   } else if (value == "protected") {
1148     // FIXME: diagnose if target does not support protected visibility
1149     return ProtectedVisibility;
1150   }
1151 
1152   diags.Report(diag::err_drv_invalid_value)
1153     << arg->getAsString(args) << value;
1154   return DefaultVisibility;
1155 }
1156 
1157 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1158                           DiagnosticsEngine &Diags) {
1159   // FIXME: Cleanup per-file based stuff.
1160   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1161   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1162     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1163 #define LANGSTANDARD(id, name, desc, features) \
1164       .Case(name, LangStandard::lang_##id)
1165 #include "clang/Frontend/LangStandards.def"
1166       .Default(LangStandard::lang_unspecified);
1167     if (LangStd == LangStandard::lang_unspecified)
1168       Diags.Report(diag::err_drv_invalid_value)
1169         << A->getAsString(Args) << A->getValue();
1170     else {
1171       // Valid standard, check to make sure language and standard are
1172       // compatible.
1173       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1174       switch (IK) {
1175       case IK_C:
1176       case IK_ObjC:
1177       case IK_PreprocessedC:
1178       case IK_PreprocessedObjC:
1179         if (!(Std.isC89() || Std.isC99()))
1180           Diags.Report(diag::err_drv_argument_not_allowed_with)
1181             << A->getAsString(Args) << "C/ObjC";
1182         break;
1183       case IK_CXX:
1184       case IK_ObjCXX:
1185       case IK_PreprocessedCXX:
1186       case IK_PreprocessedObjCXX:
1187         if (!Std.isCPlusPlus())
1188           Diags.Report(diag::err_drv_argument_not_allowed_with)
1189             << A->getAsString(Args) << "C++/ObjC++";
1190         break;
1191       case IK_OpenCL:
1192         if (!Std.isC99())
1193           Diags.Report(diag::err_drv_argument_not_allowed_with)
1194             << A->getAsString(Args) << "OpenCL";
1195         break;
1196       case IK_CUDA:
1197         if (!Std.isCPlusPlus())
1198           Diags.Report(diag::err_drv_argument_not_allowed_with)
1199             << A->getAsString(Args) << "CUDA";
1200         break;
1201       default:
1202         break;
1203       }
1204     }
1205   }
1206 
1207   // -cl-std only applies for OpenCL language standards.
1208   // Override the -std option in this case.
1209   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1210     LangStandard::Kind OpenCLLangStd
1211     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1212     .Case("CL", LangStandard::lang_opencl)
1213     .Case("CL1.1", LangStandard::lang_opencl11)
1214     .Case("CL1.2", LangStandard::lang_opencl12)
1215     .Default(LangStandard::lang_unspecified);
1216 
1217     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1218       Diags.Report(diag::err_drv_invalid_value)
1219       << A->getAsString(Args) << A->getValue();
1220     }
1221     else
1222       LangStd = OpenCLLangStd;
1223   }
1224 
1225   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1226 
1227   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1228   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1229   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1230   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1231   // name, as it doesn't seem a useful distinction.
1232   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1233                                   Opts.GNUKeywords);
1234 
1235   if (Args.hasArg(OPT_fno_operator_names))
1236     Opts.CXXOperatorNames = 0;
1237 
1238   if (Opts.ObjC1) {
1239     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1240       StringRef value = arg->getValue();
1241       if (Opts.ObjCRuntime.tryParse(value))
1242         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1243     }
1244 
1245     if (Args.hasArg(OPT_fobjc_gc_only))
1246       Opts.setGC(LangOptions::GCOnly);
1247     else if (Args.hasArg(OPT_fobjc_gc))
1248       Opts.setGC(LangOptions::HybridGC);
1249     else if (Args.hasArg(OPT_fobjc_arc)) {
1250       Opts.ObjCAutoRefCount = 1;
1251       if (!Opts.ObjCRuntime.allowsARC())
1252         Diags.Report(diag::err_arc_unsupported_on_runtime);
1253 
1254       // Only set ObjCARCWeak if ARC is enabled.
1255       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1256         Opts.ObjCARCWeak = 1;
1257       else
1258         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1259     }
1260 
1261     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1262       Opts.ObjCInferRelatedResultType = 0;
1263 
1264     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1265       Opts.ObjCSubscriptingLegacyRuntime =
1266         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1267   }
1268 
1269   if (Args.hasArg(OPT_fgnu89_inline))
1270     Opts.GNUInline = 1;
1271 
1272   if (Args.hasArg(OPT_fapple_kext)) {
1273     if (!Opts.CPlusPlus)
1274       Diags.Report(diag::warn_c_kext);
1275     else
1276       Opts.AppleKext = 1;
1277   }
1278 
1279   if (Args.hasArg(OPT_print_ivar_layout))
1280     Opts.ObjCGCBitmapPrint = 1;
1281   if (Args.hasArg(OPT_fno_constant_cfstrings))
1282     Opts.NoConstantCFStrings = 1;
1283 
1284   if (Args.hasArg(OPT_faltivec))
1285     Opts.AltiVec = 1;
1286 
1287   if (Args.hasArg(OPT_pthread))
1288     Opts.POSIXThreads = 1;
1289 
1290   // The value-visibility mode defaults to "default".
1291   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1292     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1293   } else {
1294     Opts.setValueVisibilityMode(DefaultVisibility);
1295   }
1296 
1297   // The type-visibility mode defaults to the value-visibility mode.
1298   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1299     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1300   } else {
1301     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1302   }
1303 
1304   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1305     Opts.InlineVisibilityHidden = 1;
1306 
1307   if (Args.hasArg(OPT_ftrapv)) {
1308     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1309     // Set the handler, if one is specified.
1310     Opts.OverflowHandler =
1311         Args.getLastArgValue(OPT_ftrapv_handler);
1312   }
1313   else if (Args.hasArg(OPT_fwrapv))
1314     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1315 
1316   if (Args.hasArg(OPT_trigraphs))
1317     Opts.Trigraphs = 1;
1318 
1319   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1320                                    OPT_fno_dollars_in_identifiers,
1321                                    Opts.DollarIdents);
1322   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1323   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1324   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1325   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1326   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1327   Opts.VtorDispMode = getLastArgIntValue(Args, OPT_vtordisp_mode_EQ, 1, Diags);
1328   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1329   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1330   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1331                                    Opts.ConstStrings);
1332   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1333     Opts.LaxVectorConversions = 0;
1334   if (Args.hasArg(OPT_fno_threadsafe_statics))
1335     Opts.ThreadsafeStatics = 0;
1336   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1337   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1338   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1339   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1340   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1341 
1342   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1343   Opts.Blocks = Args.hasArg(OPT_fblocks);
1344   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1345   Opts.Modules = Args.hasArg(OPT_fmodules);
1346   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1347   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1348   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1349   Opts.ShortWChar = Args.hasFlag(OPT_fshort_wchar, OPT_fno_short_wchar, false);
1350   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1351   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1352   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1353   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1354   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1355   Opts.SizedDeallocation |= Args.hasArg(OPT_fsized_deallocation);
1356   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1357   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1358   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1359   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1360   Opts.InstantiationDepth =
1361       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1362   Opts.ArrowDepth =
1363       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1364   Opts.ConstexprCallDepth =
1365       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1366   Opts.ConstexprStepLimit =
1367       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1368   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1369   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1370   Opts.NumLargeByValueCopy =
1371       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1372   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1373   Opts.ObjCConstantStringClass =
1374     Args.getLastArgValue(OPT_fconstant_string_class);
1375   Opts.ObjCDefaultSynthProperties =
1376     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1377   Opts.EncodeExtendedBlockSig =
1378     Args.hasArg(OPT_fencode_extended_block_signature);
1379   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1380   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1381   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1382   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1383   Opts.Static = Args.hasArg(OPT_static_define);
1384   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1385   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1386                         || Args.hasArg(OPT_fdump_record_layouts);
1387   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1388   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1389   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1390   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1391   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1392   Opts.MRTD = Args.hasArg(OPT_mrtd);
1393   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1394   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1395   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1396   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1397   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1398   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1399   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1400   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1401 
1402   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1403     switch (llvm::StringSwitch<unsigned>(A->getValue())
1404       .Case("target", LangOptions::ASMM_Target)
1405       .Case("no", LangOptions::ASMM_Off)
1406       .Case("yes", LangOptions::ASMM_On)
1407       .Default(255)) {
1408     default:
1409       Diags.Report(diag::err_drv_invalid_value)
1410         << "-faddress-space-map-mangling=" << A->getValue();
1411       break;
1412     case LangOptions::ASMM_Target:
1413       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1414       break;
1415     case LangOptions::ASMM_On:
1416       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1417       break;
1418     case LangOptions::ASMM_Off:
1419       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1420       break;
1421     }
1422   }
1423 
1424   if (Arg *A = Args.getLastArg(OPT_fms_memptr_rep_EQ)) {
1425     LangOptions::PragmaMSPointersToMembersKind InheritanceModel =
1426         llvm::StringSwitch<LangOptions::PragmaMSPointersToMembersKind>(
1427             A->getValue())
1428             .Case("single",
1429                   LangOptions::PPTMK_FullGeneralitySingleInheritance)
1430             .Case("multiple",
1431                   LangOptions::PPTMK_FullGeneralityMultipleInheritance)
1432             .Case("virtual",
1433                   LangOptions::PPTMK_FullGeneralityVirtualInheritance)
1434             .Default(LangOptions::PPTMK_BestCase);
1435     if (InheritanceModel == LangOptions::PPTMK_BestCase)
1436       Diags.Report(diag::err_drv_invalid_value)
1437           << "-fms-memptr-rep=" << A->getValue();
1438 
1439     Opts.setMSPointerToMemberRepresentationMethod(InheritanceModel);
1440   }
1441 
1442   // Check if -fopenmp= is specified.
1443   if (const Arg *A = Args.getLastArg(options::OPT_fopenmp_EQ)) {
1444     Opts.OpenMP = llvm::StringSwitch<bool>(A->getValue())
1445         .Case("libiomp5", true)
1446         .Default(false);
1447   }
1448 
1449   // Record whether the __DEPRECATED define was requested.
1450   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1451                                  OPT_fno_deprecated_macro,
1452                                  Opts.Deprecated);
1453 
1454   // FIXME: Eliminate this dependency.
1455   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1456        OptSize = getOptimizationLevelSize(Args);
1457   Opts.Optimize = Opt != 0;
1458   Opts.OptimizeSize = OptSize != 0;
1459 
1460   // This is the __NO_INLINE__ define, which just depends on things like the
1461   // optimization level and -fno-inline, not actually whether the backend has
1462   // inlining enabled.
1463   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1464 
1465   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1466   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1467 
1468   Opts.RetainCommentsFromSystemHeaders =
1469       Args.hasArg(OPT_fretain_comments_from_system_headers);
1470 
1471   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1472   switch (SSP) {
1473   default:
1474     Diags.Report(diag::err_drv_invalid_value)
1475       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1476     break;
1477   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1478   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1479   case 2: Opts.setStackProtector(LangOptions::SSPStrong); break;
1480   case 3: Opts.setStackProtector(LangOptions::SSPReq); break;
1481   }
1482 
1483   // Parse -fsanitize= arguments.
1484   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1485   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1486     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1487     // efficiently map string values to them. Perform the mapping indirectly:
1488     // convert strings to enumerated values, then switch over the enum to set
1489     // the right bitfield value.
1490     enum Sanitizer {
1491 #define SANITIZER(NAME, ID) \
1492       ID,
1493 #include "clang/Basic/Sanitizers.def"
1494       Unknown
1495     };
1496     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1497 #define SANITIZER(NAME, ID) \
1498               .Case(NAME, ID)
1499 #include "clang/Basic/Sanitizers.def"
1500               .Default(Unknown)) {
1501 #define SANITIZER(NAME, ID) \
1502     case ID: \
1503       Opts.Sanitize.ID = true; \
1504       break;
1505 #include "clang/Basic/Sanitizers.def"
1506 
1507     case Unknown:
1508       Diags.Report(diag::err_drv_invalid_value)
1509         << "-fsanitize=" << Sanitizers[I];
1510       break;
1511     }
1512   }
1513 }
1514 
1515 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1516                                   FileManager &FileMgr,
1517                                   DiagnosticsEngine &Diags) {
1518   using namespace options;
1519   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1520   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1521   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1522       Opts.TokenCache = A->getValue();
1523   else
1524     Opts.TokenCache = Opts.ImplicitPTHInclude;
1525   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1526   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1527   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1528 
1529   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1530   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1531          ie = Args.filtered_end(); it != ie; ++it) {
1532     const Arg *A = *it;
1533     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1534   }
1535 
1536   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1537     StringRef Value(A->getValue());
1538     size_t Comma = Value.find(',');
1539     unsigned Bytes = 0;
1540     unsigned EndOfLine = 0;
1541 
1542     if (Comma == StringRef::npos ||
1543         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1544         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1545       Diags.Report(diag::err_drv_preamble_format);
1546     else {
1547       Opts.PrecompiledPreambleBytes.first = Bytes;
1548       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1549     }
1550   }
1551 
1552   // Add macros from the command line.
1553   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1554          ie = Args.filtered_end(); it != ie; ++it) {
1555     if ((*it)->getOption().matches(OPT_D))
1556       Opts.addMacroDef((*it)->getValue());
1557     else
1558       Opts.addMacroUndef((*it)->getValue());
1559   }
1560 
1561   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1562 
1563   // Add the ordered list of -includes.
1564   for (arg_iterator it = Args.filtered_begin(OPT_include),
1565          ie = Args.filtered_end(); it != ie; ++it) {
1566     const Arg *A = *it;
1567     Opts.Includes.push_back(A->getValue());
1568   }
1569 
1570   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1571          ie = Args.filtered_end(); it != ie; ++it) {
1572     const Arg *A = *it;
1573     Opts.ChainedIncludes.push_back(A->getValue());
1574   }
1575 
1576   // Include 'altivec.h' if -faltivec option present
1577   if (Args.hasArg(OPT_faltivec))
1578     Opts.Includes.push_back("altivec.h");
1579 
1580   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1581          ie = Args.filtered_end(); it != ie; ++it) {
1582     const Arg *A = *it;
1583     std::pair<StringRef,StringRef> Split =
1584       StringRef(A->getValue()).split(';');
1585 
1586     if (Split.second.empty()) {
1587       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1588       continue;
1589     }
1590 
1591     Opts.addRemappedFile(Split.first, Split.second);
1592   }
1593 
1594   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1595     StringRef Name = A->getValue();
1596     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1597       .Case("libc++", ARCXX_libcxx)
1598       .Case("libstdc++", ARCXX_libstdcxx)
1599       .Case("none", ARCXX_nolib)
1600       .Default(~0U);
1601     if (Library == ~0U)
1602       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1603     else
1604       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1605   }
1606 }
1607 
1608 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1609                                         ArgList &Args,
1610                                         frontend::ActionKind Action) {
1611   using namespace options;
1612 
1613   switch (Action) {
1614   case frontend::ASTDeclList:
1615   case frontend::ASTDump:
1616   case frontend::ASTPrint:
1617   case frontend::ASTView:
1618   case frontend::EmitAssembly:
1619   case frontend::EmitBC:
1620   case frontend::EmitHTML:
1621   case frontend::EmitLLVM:
1622   case frontend::EmitLLVMOnly:
1623   case frontend::EmitCodeGenOnly:
1624   case frontend::EmitObj:
1625   case frontend::FixIt:
1626   case frontend::GenerateModule:
1627   case frontend::GeneratePCH:
1628   case frontend::GeneratePTH:
1629   case frontend::ParseSyntaxOnly:
1630   case frontend::ModuleFileInfo:
1631   case frontend::VerifyPCH:
1632   case frontend::PluginAction:
1633   case frontend::PrintDeclContext:
1634   case frontend::RewriteObjC:
1635   case frontend::RewriteTest:
1636   case frontend::RunAnalysis:
1637   case frontend::MigrateSource:
1638     Opts.ShowCPP = 0;
1639     break;
1640 
1641   case frontend::DumpRawTokens:
1642   case frontend::DumpTokens:
1643   case frontend::InitOnly:
1644   case frontend::PrintPreamble:
1645   case frontend::PrintPreprocessedInput:
1646   case frontend::RewriteMacros:
1647   case frontend::RunPreprocessorOnly:
1648     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1649     break;
1650   }
1651 
1652   Opts.ShowComments = Args.hasArg(OPT_C);
1653   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1654   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1655   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1656   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1657 }
1658 
1659 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1660   using namespace options;
1661   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1662   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1663   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1664   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1665   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1666   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1667 
1668   // Use the default target triple if unspecified.
1669   if (Opts.Triple.empty())
1670     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1671 }
1672 
1673 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1674                                         const char *const *ArgBegin,
1675                                         const char *const *ArgEnd,
1676                                         DiagnosticsEngine &Diags) {
1677   bool Success = true;
1678 
1679   // Parse the arguments.
1680   std::unique_ptr<OptTable> Opts(createDriverOptTable());
1681   const unsigned IncludedFlagsBitmask = options::CC1Option;
1682   unsigned MissingArgIndex, MissingArgCount;
1683   std::unique_ptr<InputArgList> Args(
1684       Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1685                       IncludedFlagsBitmask));
1686 
1687   // Check for missing argument error.
1688   if (MissingArgCount) {
1689     Diags.Report(diag::err_drv_missing_argument)
1690       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1691     Success = false;
1692   }
1693 
1694   // Issue errors on unknown arguments.
1695   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1696          ie = Args->filtered_end(); it != ie; ++it) {
1697     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1698     Success = false;
1699   }
1700 
1701   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1702   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1703   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1704   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1705             && Success;
1706   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1707   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1708   // FIXME: We shouldn't have to pass the DashX option around here
1709   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1710   ParseTargetArgs(Res.getTargetOpts(), *Args);
1711   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags,
1712                              Res.getTargetOpts()) && Success;
1713   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1714   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1715     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1716     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1717       Res.getLangOpts()->ObjCExceptions = 1;
1718   }
1719   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1720   // PCH file and find the original header name. Remove the need to do that in
1721   // ParsePreprocessorArgs and remove the FileManager
1722   // parameters from the function and the "FileManager.h" #include.
1723   FileManager FileMgr(Res.getFileSystemOpts());
1724   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1725   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1726                               Res.getFrontendOpts().ProgramAction);
1727   return Success;
1728 }
1729 
1730 namespace {
1731 
1732   class ModuleSignature {
1733     SmallVector<uint64_t, 16> Data;
1734     unsigned CurBit;
1735     uint64_t CurValue;
1736 
1737   public:
1738     ModuleSignature() : CurBit(0), CurValue(0) { }
1739 
1740     void add(uint64_t Value, unsigned Bits);
1741     void add(StringRef Value);
1742     void flush();
1743 
1744     llvm::APInt getAsInteger() const;
1745   };
1746 }
1747 
1748 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1749   CurValue |= Value << CurBit;
1750   if (CurBit + NumBits < 64) {
1751     CurBit += NumBits;
1752     return;
1753   }
1754 
1755   // Add the current word.
1756   Data.push_back(CurValue);
1757 
1758   if (CurBit)
1759     CurValue = Value >> (64-CurBit);
1760   else
1761     CurValue = 0;
1762   CurBit = (CurBit+NumBits) & 63;
1763 }
1764 
1765 void ModuleSignature::flush() {
1766   if (CurBit == 0)
1767     return;
1768 
1769   Data.push_back(CurValue);
1770   CurBit = 0;
1771   CurValue = 0;
1772 }
1773 
1774 void ModuleSignature::add(StringRef Value) {
1775   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1776     add(*I, 8);
1777 }
1778 
1779 llvm::APInt ModuleSignature::getAsInteger() const {
1780   return llvm::APInt(Data.size() * 64, Data);
1781 }
1782 
1783 std::string CompilerInvocation::getModuleHash() const {
1784   // Note: For QoI reasons, the things we use as a hash here should all be
1785   // dumped via the -module-info flag.
1786   using llvm::hash_code;
1787   using llvm::hash_value;
1788   using llvm::hash_combine;
1789 
1790   // Start the signature with the compiler version.
1791   // FIXME: We'd rather use something more cryptographically sound than
1792   // CityHash, but this will do for now.
1793   hash_code code = hash_value(getClangFullRepositoryVersion());
1794 
1795   // Extend the signature with the language options
1796 #define LANGOPT(Name, Bits, Default, Description) \
1797    code = hash_combine(code, LangOpts->Name);
1798 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1799   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1800 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1801 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1802 #include "clang/Basic/LangOptions.def"
1803 
1804   // Extend the signature with the target options.
1805   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1806                       TargetOpts->ABI, TargetOpts->LinkerVersion);
1807   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1808     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1809 
1810   // Extend the signature with preprocessor options.
1811   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1812   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1813   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1814 
1815   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1816             I = getPreprocessorOpts().Macros.begin(),
1817          IEnd = getPreprocessorOpts().Macros.end();
1818        I != IEnd; ++I) {
1819     // If we're supposed to ignore this macro for the purposes of modules,
1820     // don't put it into the hash.
1821     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1822       // Check whether we're ignoring this macro.
1823       StringRef MacroDef = I->first;
1824       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1825         continue;
1826     }
1827 
1828     code = hash_combine(code, I->first, I->second);
1829   }
1830 
1831   // Extend the signature with the sysroot.
1832   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1833                       hsOpts.UseStandardSystemIncludes,
1834                       hsOpts.UseStandardCXXIncludes,
1835                       hsOpts.UseLibcxx);
1836 
1837   // Extend the signature with the user build path.
1838   code = hash_combine(code, hsOpts.ModuleUserBuildPath);
1839 
1840   // Darwin-specific hack: if we have a sysroot, use the contents and
1841   // modification time of
1842   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1843   // as part of the module hash.
1844   if (!hsOpts.Sysroot.empty()) {
1845     std::unique_ptr<llvm::MemoryBuffer> buffer;
1846     SmallString<128> systemVersionFile;
1847     systemVersionFile += hsOpts.Sysroot;
1848     llvm::sys::path::append(systemVersionFile, "System");
1849     llvm::sys::path::append(systemVersionFile, "Library");
1850     llvm::sys::path::append(systemVersionFile, "CoreServices");
1851     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1852     if (!llvm::MemoryBuffer::getFile(systemVersionFile.str(), buffer)) {
1853       code = hash_combine(code, buffer.get()->getBuffer());
1854 
1855       struct stat statBuf;
1856       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1857         code = hash_combine(code, statBuf.st_mtime);
1858     }
1859   }
1860 
1861   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1862 }
1863 
1864 namespace clang {
1865 
1866 template<typename IntTy>
1867 static IntTy getLastArgIntValueImpl(const ArgList &Args, OptSpecifier Id,
1868                                     IntTy Default,
1869                                     DiagnosticsEngine *Diags) {
1870   IntTy Res = Default;
1871   if (Arg *A = Args.getLastArg(Id)) {
1872     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1873       if (Diags)
1874         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1875                                                        << A->getValue();
1876     }
1877   }
1878   return Res;
1879 }
1880 
1881 
1882 // Declared in clang/Frontend/Utils.h.
1883 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1884                        DiagnosticsEngine *Diags) {
1885   return getLastArgIntValueImpl<int>(Args, Id, Default, Diags);
1886 }
1887 
1888 uint64_t getLastArgUInt64Value(const ArgList &Args, OptSpecifier Id,
1889                                uint64_t Default,
1890                                DiagnosticsEngine *Diags) {
1891   return getLastArgIntValueImpl<uint64_t>(Args, Id, Default, Diags);
1892 }
1893 
1894 void BuryPointer(const void *Ptr) {
1895   // This function may be called only a small fixed amount of times per each
1896   // invocation, otherwise we do actually have a leak which we want to report.
1897   // If this function is called more than kGraveYardMaxSize times, the pointers
1898   // will not be properly buried and a leak detector will report a leak, which
1899   // is what we want in such case.
1900   static const size_t kGraveYardMaxSize = 16;
1901   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
1902   static std::atomic<unsigned> GraveYardSize;
1903   unsigned Idx = GraveYardSize++;
1904   if (Idx >= kGraveYardMaxSize)
1905     return;
1906   GraveYard[Idx] = Ptr;
1907 }
1908 }
1909