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/Arg.h"
15 #include "clang/Driver/ArgList.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/OptTable.h"
18 #include "clang/Driver/Option.h"
19 #include "clang/Driver/Options.h"
20 #include "clang/Frontend/LangStandard.h"
21 #include "clang/Lex/HeaderSearchOptions.h"
22 #include "clang/Serialization/ASTReader.h"
23 #include "llvm/ADT/Hashing.h"
24 #include "llvm/ADT/OwningPtr.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/StringSwitch.h"
28 #include "llvm/ADT/Triple.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/Host.h"
31 #include "llvm/Support/Path.h"
32 using namespace clang;
33 
34 //===----------------------------------------------------------------------===//
35 // Initialization.
36 //===----------------------------------------------------------------------===//
37 
38 CompilerInvocationBase::CompilerInvocationBase()
39   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
40     DiagnosticOpts(new DiagnosticOptions()),
41     HeaderSearchOpts(new HeaderSearchOptions()),
42     PreprocessorOpts(new PreprocessorOptions()) {}
43 
44 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
45   : RefCountedBase<CompilerInvocation>(),
46     LangOpts(new LangOptions(*X.getLangOpts())),
47     TargetOpts(new TargetOptions(X.getTargetOpts())),
48     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
49     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
50     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
51 
52 //===----------------------------------------------------------------------===//
53 // Deserialization (from args)
54 //===----------------------------------------------------------------------===//
55 
56 using namespace clang::driver;
57 using namespace clang::driver::options;
58 
59 //
60 
61 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
62                                      DiagnosticsEngine &Diags) {
63   unsigned DefaultOpt = 0;
64   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
65     DefaultOpt = 2;
66 
67   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
68     if (A->getOption().matches(options::OPT_O0))
69       return 0;
70 
71     assert (A->getOption().matches(options::OPT_O));
72 
73     StringRef S(A->getValue());
74     if (S == "s" || S == "z" || S.empty())
75       return 2;
76 
77     return Args.getLastArgIntValue(OPT_O, DefaultOpt, Diags);
78   }
79 
80   return DefaultOpt;
81 }
82 
83 static unsigned getOptimizationLevelSize(ArgList &Args, InputKind IK,
84                                          DiagnosticsEngine &Diags) {
85   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
86     if (A->getOption().matches(options::OPT_O)) {
87       switch (A->getValue()[0]) {
88       default:
89         return 0;
90       case 's':
91         return 1;
92       case 'z':
93         return 2;
94       }
95     }
96   }
97   return 0;
98 }
99 
100 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
101   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
102          E = Args.filtered_end(); I != E; ++I) {
103     Arg *A = *I;
104     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
105     // to the warning list. Else, add its value (for the OPT_W case).
106     if (A->getOption().getKind() == Option::FlagClass) {
107       Warnings.push_back(A->getOption().getName().substr(1));
108     } else {
109       for (unsigned Idx = 0, End = A->getNumValues();
110            Idx < End; ++Idx) {
111         StringRef V = A->getValue(Idx);
112         // "-Wl," and such are not warning options.
113         // FIXME: Should be handled by putting these in separate flags.
114         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
115           continue;
116 
117         Warnings.push_back(V);
118       }
119     }
120   }
121 }
122 
123 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
124                               DiagnosticsEngine &Diags) {
125   using namespace options;
126   bool Success = true;
127   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
128     StringRef Name = A->getValue();
129     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
130 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
131       .Case(CMDFLAG, NAME##Model)
132 #include "clang/StaticAnalyzer/Core/Analyses.def"
133       .Default(NumStores);
134     if (Value == NumStores) {
135       Diags.Report(diag::err_drv_invalid_value)
136         << A->getAsString(Args) << Name;
137       Success = false;
138     } else {
139       Opts.AnalysisStoreOpt = Value;
140     }
141   }
142 
143   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
144     StringRef Name = A->getValue();
145     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
146 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
147       .Case(CMDFLAG, NAME##Model)
148 #include "clang/StaticAnalyzer/Core/Analyses.def"
149       .Default(NumConstraints);
150     if (Value == NumConstraints) {
151       Diags.Report(diag::err_drv_invalid_value)
152         << A->getAsString(Args) << Name;
153       Success = false;
154     } else {
155       Opts.AnalysisConstraintsOpt = Value;
156     }
157   }
158 
159   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
160     StringRef Name = A->getValue();
161     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
162 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN, AUTOCREAT) \
163       .Case(CMDFLAG, PD_##NAME)
164 #include "clang/StaticAnalyzer/Core/Analyses.def"
165       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
166     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
167       Diags.Report(diag::err_drv_invalid_value)
168         << A->getAsString(Args) << Name;
169       Success = false;
170     } else {
171       Opts.AnalysisDiagOpt = Value;
172     }
173   }
174 
175   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
176     StringRef Name = A->getValue();
177     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
178 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
179       .Case(CMDFLAG, NAME)
180 #include "clang/StaticAnalyzer/Core/Analyses.def"
181       .Default(NumPurgeModes);
182     if (Value == NumPurgeModes) {
183       Diags.Report(diag::err_drv_invalid_value)
184         << A->getAsString(Args) << Name;
185       Success = false;
186     } else {
187       Opts.AnalysisPurgeOpt = Value;
188     }
189   }
190 
191   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
192     StringRef Name = A->getValue();
193     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
194 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
195       .Case(CMDFLAG, NAME)
196 #include "clang/StaticAnalyzer/Core/Analyses.def"
197       .Default(NumInliningModes);
198     if (Value == NumInliningModes) {
199       Diags.Report(diag::err_drv_invalid_value)
200         << A->getAsString(Args) << Name;
201       Success = false;
202     } else {
203       Opts.InliningMode = Value;
204     }
205   }
206 
207   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
208   Opts.visualizeExplodedGraphWithGraphViz =
209     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
210   Opts.visualizeExplodedGraphWithUbiGraph =
211     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
212   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
213   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
214   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
215   Opts.AnalyzeNestedBlocks =
216     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
217   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
218   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
219   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
220   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
221   Opts.maxBlockVisitOnPath = Args.getLastArgIntValue(OPT_analyzer_max_loop, 4, Diags);
222   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
223   Opts.InlineMaxStackDepth =
224     Args.getLastArgIntValue(OPT_analyzer_inline_max_stack_depth,
225                             Opts.InlineMaxStackDepth, Diags);
226 
227   Opts.CheckersControlList.clear();
228   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
229                                              OPT_analyzer_disable_checker),
230          ie = Args.filtered_end(); it != ie; ++it) {
231     const Arg *A = *it;
232     A->claim();
233     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
234     // We can have a list of comma separated checker names, e.g:
235     // '-analyzer-checker=cocoa,unix'
236     StringRef checkerList = A->getValue();
237     SmallVector<StringRef, 4> checkers;
238     checkerList.split(checkers, ",");
239     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
240       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
241   }
242 
243   // Go through the analyzer configuration options.
244   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
245        ie = Args.filtered_end(); it != ie; ++it) {
246     const Arg *A = *it;
247     A->claim();
248     // We can have a list of comma separated config names, e.g:
249     // '-analyzer-config key1=val1,key2=val2'
250     StringRef configList = A->getValue();
251     SmallVector<StringRef, 4> configVals;
252     configList.split(configVals, ",");
253     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
254       StringRef key, val;
255       llvm::tie(key, val) = configVals[i].split("=");
256       if (val.empty()) {
257         Diags.Report(SourceLocation(),
258                      diag::err_analyzer_config_no_value) << configVals[i];
259         Success = false;
260         break;
261       }
262       if (val.find('=') != StringRef::npos) {
263         Diags.Report(SourceLocation(),
264                      diag::err_analyzer_config_multiple_values)
265           << configVals[i];
266         Success = false;
267         break;
268       }
269       Opts.Config[key] = val;
270     }
271   }
272 
273   return Success;
274 }
275 
276 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
277   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
278   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
279   return true;
280 }
281 
282 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
283   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
284 }
285 
286 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
287                              DiagnosticsEngine &Diags) {
288   using namespace options;
289   bool Success = true;
290 
291   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
292   if (OptLevel > 3) {
293     Diags.Report(diag::err_drv_invalid_value)
294       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
295     OptLevel = 3;
296     Success = false;
297   }
298   Opts.OptimizationLevel = OptLevel;
299 
300   // We must always run at least the always inlining pass.
301   Opts.setInlining(
302     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
303                                  : CodeGenOptions::OnlyAlwaysInlining);
304   // -fno-inline-functions overrides OptimizationLevel > 1.
305   Opts.NoInline = Args.hasArg(OPT_fno_inline);
306   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
307                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
308 
309   if (Args.hasArg(OPT_gline_tables_only)) {
310     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
311   } else if (Args.hasArg(OPT_g_Flag)) {
312     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
313       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
314     else
315       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
316   }
317   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
318   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
319 
320   Opts.ModulesAutolink = Args.hasArg(OPT_fmodules_autolink);
321   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
322   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
323   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
324   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
325     OPT_fuse_register_sized_bitfield_access);
326   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
327   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
328   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
329   Opts.NoCommon = Args.hasArg(OPT_fno_common);
330   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
331   Opts.OptimizeSize = getOptimizationLevelSize(Args, IK, Diags);
332   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
333                             Args.hasArg(OPT_ffreestanding));
334   Opts.UnrollLoops = Args.hasArg(OPT_funroll_loops) ||
335                      (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize);
336 
337   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
338   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
339   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
340   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
341   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
342   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
343   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
344   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
345   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
346   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
347   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
348   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
349   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
350   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
351                        Args.hasArg(OPT_cl_finite_math_only)||
352                        Args.hasArg(OPT_cl_fast_relaxed_math));
353   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
354                        Args.hasArg(OPT_cl_finite_math_only)||
355                        Args.hasArg(OPT_cl_fast_relaxed_math));
356   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
357   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
358   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);
359   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
360   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
361   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
362   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
363   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
364   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
365   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
366   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
367   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
368   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
369                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
370                       Args.hasArg(OPT_cl_fast_relaxed_math);
371   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
372   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
373   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
374   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
375 
376   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
377   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
378 
379   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
380   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
381   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
382 
383   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
384   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
385   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
386   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
387   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
388     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
389     Opts.CoverageNoFunctionNamesInData =
390         Args.hasArg(OPT_coverage_no_function_names_in_data);
391     if (Args.hasArg(OPT_coverage_version_EQ)) {
392       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
393       if (CoverageVersion.size() != 4) {
394         Diags.Report(diag::err_drv_invalid_value)
395             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
396             << CoverageVersion;
397       } else {
398         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
399       }
400     }
401   }
402 
403   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
404   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
405   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
406   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
407   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
408   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
409   Opts.SanitizeMemoryTrackOrigins =
410     Args.hasArg(OPT_fsanitize_memory_track_origins);
411   Opts.SanitizeAddressZeroBaseShadow =
412     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
413   Opts.SanitizeUndefinedTrapOnError =
414     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
415   Opts.SSPBufferSize =
416     Args.getLastArgIntValue(OPT_stack_protector_buffer_size, 8, Diags);
417   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
418   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
419     StringRef Val = A->getValue();
420     unsigned StackAlignment = Opts.StackAlignment;
421     Val.getAsInteger(10, StackAlignment);
422     Opts.StackAlignment = StackAlignment;
423   }
424 
425   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
426     StringRef Name = A->getValue();
427     unsigned Method = llvm::StringSwitch<unsigned>(Name)
428       .Case("legacy", CodeGenOptions::Legacy)
429       .Case("non-legacy", CodeGenOptions::NonLegacy)
430       .Case("mixed", CodeGenOptions::Mixed)
431       .Default(~0U);
432     if (Method == ~0U) {
433       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
434       Success = false;
435     } else {
436       Opts.setObjCDispatchMethod(
437         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
438     }
439   }
440 
441   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
442     StringRef Name = A->getValue();
443     unsigned Model = llvm::StringSwitch<unsigned>(Name)
444         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
445         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
446         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
447         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
448         .Default(~0U);
449     if (Model == ~0U) {
450       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
451       Success = false;
452     } else {
453       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
454     }
455   }
456 
457   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
458     StringRef Val = A->getValue();
459     if (Val == "fast")
460       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
461     else if (Val == "on")
462       Opts.setFPContractMode(CodeGenOptions::FPC_On);
463     else if (Val == "off")
464       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
465     else
466       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
467   }
468 
469   return Success;
470 }
471 
472 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
473                                       ArgList &Args) {
474   using namespace options;
475   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
476   Opts.Targets = Args.getAllArgValues(OPT_MT);
477   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
478   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
479   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
480   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
481   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
482   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
483 }
484 
485 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
486                                 DiagnosticsEngine *Diags) {
487   using namespace options;
488   bool Success = true;
489 
490   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
491   Opts.DiagnosticSerializationFile =
492     Args.getLastArgValue(OPT_diagnostic_serialized_file);
493   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
494   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
495   Opts.Pedantic = Args.hasArg(OPT_pedantic);
496   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
497   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
498   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
499   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
500                                  OPT_fno_show_column,
501                                  /*Default=*/true);
502   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
503   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
504   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
505 
506   // Default behavior is to not to show note include stacks.
507   Opts.ShowNoteIncludeStack = false;
508   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
509                                OPT_fno_diagnostics_show_note_include_stack))
510     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
511       Opts.ShowNoteIncludeStack = true;
512 
513   StringRef ShowOverloads =
514     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
515   if (ShowOverloads == "best")
516     Opts.setShowOverloads(Ovl_Best);
517   else if (ShowOverloads == "all")
518     Opts.setShowOverloads(Ovl_All);
519   else {
520     Success = false;
521     if (Diags)
522       Diags->Report(diag::err_drv_invalid_value)
523       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
524       << ShowOverloads;
525   }
526 
527   StringRef ShowCategory =
528     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
529   if (ShowCategory == "none")
530     Opts.ShowCategories = 0;
531   else if (ShowCategory == "id")
532     Opts.ShowCategories = 1;
533   else if (ShowCategory == "name")
534     Opts.ShowCategories = 2;
535   else {
536     Success = false;
537     if (Diags)
538       Diags->Report(diag::err_drv_invalid_value)
539       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
540       << ShowCategory;
541   }
542 
543   StringRef Format =
544     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
545   if (Format == "clang")
546     Opts.setFormat(DiagnosticOptions::Clang);
547   else if (Format == "msvc")
548     Opts.setFormat(DiagnosticOptions::Msvc);
549   else if (Format == "vi")
550     Opts.setFormat(DiagnosticOptions::Vi);
551   else {
552     Success = false;
553     if (Diags)
554       Diags->Report(diag::err_drv_invalid_value)
555       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
556       << Format;
557   }
558 
559   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
560   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
561   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
562   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
563   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
564   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
565   Opts.WarnOnSpellCheck = Args.hasArg(OPT_fwarn_on_spellcheck);
566   Opts.ErrorLimit = Args.getLastArgIntValue(OPT_ferror_limit, 0, Diags);
567   Opts.MacroBacktraceLimit
568     = Args.getLastArgIntValue(OPT_fmacro_backtrace_limit,
569                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
570   Opts.TemplateBacktraceLimit
571     = Args.getLastArgIntValue(OPT_ftemplate_backtrace_limit,
572                          DiagnosticOptions::DefaultTemplateBacktraceLimit,
573                          Diags);
574   Opts.ConstexprBacktraceLimit
575     = Args.getLastArgIntValue(OPT_fconstexpr_backtrace_limit,
576                          DiagnosticOptions::DefaultConstexprBacktraceLimit,
577                          Diags);
578   Opts.TabStop = Args.getLastArgIntValue(OPT_ftabstop,
579                                     DiagnosticOptions::DefaultTabStop, Diags);
580   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
581     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
582     if (Diags)
583       Diags->Report(diag::warn_ignoring_ftabstop_value)
584       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
585   }
586   Opts.MessageLength = Args.getLastArgIntValue(OPT_fmessage_length, 0, Diags);
587   addWarningArgs(Args, Opts.Warnings);
588 
589   return Success;
590 }
591 
592 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
593   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
594 }
595 
596 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
597                                    DiagnosticsEngine &Diags) {
598   using namespace options;
599   Opts.ProgramAction = frontend::ParseSyntaxOnly;
600   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
601     switch (A->getOption().getID()) {
602     default:
603       llvm_unreachable("Invalid option in group!");
604     case OPT_ast_list:
605       Opts.ProgramAction = frontend::ASTDeclList; break;
606     case OPT_ast_dump:
607       Opts.ProgramAction = frontend::ASTDump; break;
608     case OPT_ast_dump_xml:
609       Opts.ProgramAction = frontend::ASTDumpXML; break;
610     case OPT_ast_print:
611       Opts.ProgramAction = frontend::ASTPrint; break;
612     case OPT_ast_view:
613       Opts.ProgramAction = frontend::ASTView; break;
614     case OPT_dump_raw_tokens:
615       Opts.ProgramAction = frontend::DumpRawTokens; break;
616     case OPT_dump_tokens:
617       Opts.ProgramAction = frontend::DumpTokens; break;
618     case OPT_S:
619       Opts.ProgramAction = frontend::EmitAssembly; break;
620     case OPT_emit_llvm_bc:
621       Opts.ProgramAction = frontend::EmitBC; break;
622     case OPT_emit_html:
623       Opts.ProgramAction = frontend::EmitHTML; break;
624     case OPT_emit_llvm:
625       Opts.ProgramAction = frontend::EmitLLVM; break;
626     case OPT_emit_llvm_only:
627       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
628     case OPT_emit_codegen_only:
629       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
630     case OPT_emit_obj:
631       Opts.ProgramAction = frontend::EmitObj; break;
632     case OPT_fixit_EQ:
633       Opts.FixItSuffix = A->getValue();
634       // fall-through!
635     case OPT_fixit:
636       Opts.ProgramAction = frontend::FixIt; break;
637     case OPT_emit_module:
638       Opts.ProgramAction = frontend::GenerateModule; break;
639     case OPT_emit_pch:
640       Opts.ProgramAction = frontend::GeneratePCH; break;
641     case OPT_emit_pth:
642       Opts.ProgramAction = frontend::GeneratePTH; break;
643     case OPT_init_only:
644       Opts.ProgramAction = frontend::InitOnly; break;
645     case OPT_fsyntax_only:
646       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
647     case OPT_print_decl_contexts:
648       Opts.ProgramAction = frontend::PrintDeclContext; break;
649     case OPT_print_preamble:
650       Opts.ProgramAction = frontend::PrintPreamble; break;
651     case OPT_E:
652       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
653     case OPT_rewrite_macros:
654       Opts.ProgramAction = frontend::RewriteMacros; break;
655     case OPT_rewrite_objc:
656       Opts.ProgramAction = frontend::RewriteObjC; break;
657     case OPT_rewrite_test:
658       Opts.ProgramAction = frontend::RewriteTest; break;
659     case OPT_analyze:
660       Opts.ProgramAction = frontend::RunAnalysis; break;
661     case OPT_migrate:
662       Opts.ProgramAction = frontend::MigrateSource; break;
663     case OPT_Eonly:
664       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
665     }
666   }
667 
668   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
669     Opts.Plugins.push_back(A->getValue(0));
670     Opts.ProgramAction = frontend::PluginAction;
671     Opts.ActionName = A->getValue();
672 
673     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
674            end = Args.filtered_end(); it != end; ++it) {
675       if ((*it)->getValue(0) == Opts.ActionName)
676         Opts.PluginArgs.push_back((*it)->getValue(1));
677     }
678   }
679 
680   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
681   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
682   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
683     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
684            end = Args.filtered_end(); it != end; ++it) {
685       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
686         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
687     }
688   }
689 
690   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
691     Opts.CodeCompletionAt =
692       ParsedSourceLocation::FromString(A->getValue());
693     if (Opts.CodeCompletionAt.FileName.empty())
694       Diags.Report(diag::err_drv_invalid_value)
695         << A->getAsString(Args) << A->getValue();
696   }
697   Opts.DisableFree = Args.hasArg(OPT_disable_free);
698 
699   Opts.OutputFile = Args.getLastArgValue(OPT_o);
700   Opts.Plugins = Args.getAllArgValues(OPT_load);
701   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
702   Opts.ShowHelp = Args.hasArg(OPT_help);
703   Opts.ShowStats = Args.hasArg(OPT_print_stats);
704   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
705   Opts.ShowVersion = Args.hasArg(OPT_version);
706   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
707   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
708   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
709   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
710   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
711   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
712   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
713   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
714   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
715 
716   Opts.CodeCompleteOpts.IncludeMacros
717     = Args.hasArg(OPT_code_completion_macros);
718   Opts.CodeCompleteOpts.IncludeCodePatterns
719     = Args.hasArg(OPT_code_completion_patterns);
720   Opts.CodeCompleteOpts.IncludeGlobals
721     = !Args.hasArg(OPT_no_code_completion_globals);
722   Opts.CodeCompleteOpts.IncludeBriefComments
723     = Args.hasArg(OPT_code_completion_brief_comments);
724 
725   Opts.OverrideRecordLayoutsFile
726     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
727   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
728                                      OPT_arcmt_modify,
729                                      OPT_arcmt_migrate)) {
730     switch (A->getOption().getID()) {
731     default:
732       llvm_unreachable("missed a case");
733     case OPT_arcmt_check:
734       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
735       break;
736     case OPT_arcmt_modify:
737       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
738       break;
739     case OPT_arcmt_migrate:
740       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
741       break;
742     }
743   }
744   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
745   Opts.ARCMTMigrateReportOut
746     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
747   Opts.ARCMTMigrateEmitARCErrors
748     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
749 
750   if (Args.hasArg(OPT_objcmt_migrate_literals))
751     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
752   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
753     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
754 
755   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
756       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
757     Diags.Report(diag::err_drv_argument_not_allowed_with)
758       << "ARC migration" << "ObjC migration";
759   }
760 
761   InputKind DashX = IK_None;
762   if (const Arg *A = Args.getLastArg(OPT_x)) {
763     DashX = llvm::StringSwitch<InputKind>(A->getValue())
764       .Case("c", IK_C)
765       .Case("cl", IK_OpenCL)
766       .Case("cuda", IK_CUDA)
767       .Case("c++", IK_CXX)
768       .Case("objective-c", IK_ObjC)
769       .Case("objective-c++", IK_ObjCXX)
770       .Case("cpp-output", IK_PreprocessedC)
771       .Case("assembler-with-cpp", IK_Asm)
772       .Case("c++-cpp-output", IK_PreprocessedCXX)
773       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
774       .Case("objc-cpp-output", IK_PreprocessedObjC)
775       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
776       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
777       .Case("c-header", IK_C)
778       .Case("cl-header", IK_OpenCL)
779       .Case("objective-c-header", IK_ObjC)
780       .Case("c++-header", IK_CXX)
781       .Case("objective-c++-header", IK_ObjCXX)
782       .Case("ast", IK_AST)
783       .Case("ir", IK_LLVM_IR)
784       .Default(IK_None);
785     if (DashX == IK_None)
786       Diags.Report(diag::err_drv_invalid_value)
787         << A->getAsString(Args) << A->getValue();
788   }
789 
790   // '-' is the default input if none is given.
791   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
792   Opts.Inputs.clear();
793   if (Inputs.empty())
794     Inputs.push_back("-");
795   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
796     InputKind IK = DashX;
797     if (IK == IK_None) {
798       IK = FrontendOptions::getInputKindForExtension(
799         StringRef(Inputs[i]).rsplit('.').second);
800       // FIXME: Remove this hack.
801       if (i == 0)
802         DashX = IK;
803     }
804     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
805   }
806 
807   return DashX;
808 }
809 
810 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
811                                                  void *MainAddr) {
812   llvm::sys::Path P = llvm::sys::Path::GetMainExecutable(Argv0, MainAddr);
813 
814   if (!P.isEmpty()) {
815     P.eraseComponent();  // Remove /clang from foo/bin/clang
816     P.eraseComponent();  // Remove /bin   from foo/bin
817 
818     // Get foo/lib/clang/<version>/include
819     P.appendComponent("lib");
820     P.appendComponent("clang");
821     P.appendComponent(CLANG_VERSION_STRING);
822   }
823 
824   return P.str();
825 }
826 
827 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
828   using namespace options;
829   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
830   Opts.Verbose = Args.hasArg(OPT_v);
831   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
832   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
833   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
834   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
835     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
836   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
837   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
838   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
839 
840   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
841        ie = Args.filtered_end(); it != ie; ++it) {
842     StringRef MacroDef = (*it)->getValue();
843     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
844   }
845 
846   // Add -I..., -F..., and -index-header-map options in order.
847   bool IsIndexHeaderMap = false;
848   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
849                                              OPT_index_header_map),
850        ie = Args.filtered_end(); it != ie; ++it) {
851     if ((*it)->getOption().matches(OPT_index_header_map)) {
852       // -index-header-map applies to the next -I or -F.
853       IsIndexHeaderMap = true;
854       continue;
855     }
856 
857     frontend::IncludeDirGroup Group
858       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
859 
860     Opts.AddPath((*it)->getValue(), Group,
861                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
862     IsIndexHeaderMap = false;
863   }
864 
865   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
866   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
867   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
868                                              OPT_iwithprefixbefore),
869          ie = Args.filtered_end(); it != ie; ++it) {
870     const Arg *A = *it;
871     if (A->getOption().matches(OPT_iprefix))
872       Prefix = A->getValue();
873     else if (A->getOption().matches(OPT_iwithprefix))
874       Opts.AddPath(Prefix.str() + A->getValue(),
875                    frontend::After, false, true);
876     else
877       Opts.AddPath(Prefix.str() + A->getValue(),
878                    frontend::Angled, false, true);
879   }
880 
881   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
882          ie = Args.filtered_end(); it != ie; ++it)
883     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
884   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
885          ie = Args.filtered_end(); it != ie; ++it)
886     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
887   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
888          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
889     Opts.AddPath((*it)->getValue(), frontend::System, false,
890                  !(*it)->getOption().matches(OPT_iwithsysroot));
891   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
892          ie = Args.filtered_end(); it != ie; ++it)
893     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
894 
895   // Add the paths for the various language specific isystem flags.
896   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
897        ie = Args.filtered_end(); it != ie; ++it)
898     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
899   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
900        ie = Args.filtered_end(); it != ie; ++it)
901     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
902   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
903        ie = Args.filtered_end(); it != ie; ++it)
904     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
905   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
906        ie = Args.filtered_end(); it != ie; ++it)
907     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
908 
909   // Add the internal paths from a driver that detects standard include paths.
910   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
911                                             OPT_internal_externc_isystem),
912                     E = Args.filtered_end();
913        I != E; ++I) {
914     frontend::IncludeDirGroup Group = frontend::System;
915     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
916       Group = frontend::ExternCSystem;
917     Opts.AddPath((*I)->getValue(), Group, false, true);
918   }
919 
920   // Add the path prefixes which are implicitly treated as being system headers.
921   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
922                                             OPT_ino_system_prefix),
923                     E = Args.filtered_end();
924        I != E; ++I)
925     Opts.AddSystemHeaderPrefix((*I)->getValue(),
926                                (*I)->getOption().matches(OPT_isystem_prefix));
927 }
928 
929 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
930                                          LangStandard::Kind LangStd) {
931   // Set some properties which depend solely on the input kind; it would be nice
932   // to move these to the language standard, and have the driver resolve the
933   // input kind + language standard.
934   if (IK == IK_Asm) {
935     Opts.AsmPreprocessor = 1;
936   } else if (IK == IK_ObjC ||
937              IK == IK_ObjCXX ||
938              IK == IK_PreprocessedObjC ||
939              IK == IK_PreprocessedObjCXX) {
940     Opts.ObjC1 = Opts.ObjC2 = 1;
941   }
942 
943   if (LangStd == LangStandard::lang_unspecified) {
944     // Based on the base language, pick one.
945     switch (IK) {
946     case IK_None:
947     case IK_AST:
948     case IK_LLVM_IR:
949       llvm_unreachable("Invalid input kind!");
950     case IK_OpenCL:
951       LangStd = LangStandard::lang_opencl;
952       break;
953     case IK_CUDA:
954       LangStd = LangStandard::lang_cuda;
955       break;
956     case IK_Asm:
957     case IK_C:
958     case IK_PreprocessedC:
959     case IK_ObjC:
960     case IK_PreprocessedObjC:
961       LangStd = LangStandard::lang_gnu99;
962       break;
963     case IK_CXX:
964     case IK_PreprocessedCXX:
965     case IK_ObjCXX:
966     case IK_PreprocessedObjCXX:
967       LangStd = LangStandard::lang_gnucxx98;
968       break;
969     }
970   }
971 
972   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
973   Opts.LineComment = Std.hasLineComments();
974   Opts.C99 = Std.isC99();
975   Opts.C11 = Std.isC11();
976   Opts.CPlusPlus = Std.isCPlusPlus();
977   Opts.CPlusPlus11 = Std.isCPlusPlus11();
978   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
979   Opts.Digraphs = Std.hasDigraphs();
980   Opts.GNUMode = Std.isGNUMode();
981   Opts.GNUInline = !Std.isC99();
982   Opts.HexFloats = Std.hasHexFloats();
983   Opts.ImplicitInt = Std.hasImplicitInt();
984 
985   // Set OpenCL Version.
986   if (LangStd == LangStandard::lang_opencl) {
987     Opts.OpenCL = 1;
988     Opts.OpenCLVersion = 100;
989   }
990   else if (LangStd == LangStandard::lang_opencl11) {
991       Opts.OpenCL = 1;
992       Opts.OpenCLVersion = 110;
993   }
994   else if (LangStd == LangStandard::lang_opencl12) {
995     Opts.OpenCL = 1;
996     Opts.OpenCLVersion = 120;
997   }
998 
999   // OpenCL has some additional defaults.
1000   if (Opts.OpenCL) {
1001     Opts.AltiVec = 0;
1002     Opts.CXXOperatorNames = 1;
1003     Opts.LaxVectorConversions = 0;
1004     Opts.DefaultFPContract = 1;
1005     Opts.NativeHalfType = 1;
1006   }
1007 
1008   if (LangStd == LangStandard::lang_cuda)
1009     Opts.CUDA = 1;
1010 
1011   // OpenCL and C++ both have bool, true, false keywords.
1012   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1013 
1014   // C++ has wchar_t keyword.
1015   Opts.WChar = Opts.CPlusPlus;
1016 
1017   Opts.GNUKeywords = Opts.GNUMode;
1018   Opts.CXXOperatorNames = Opts.CPlusPlus;
1019 
1020   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1021   // is specified, or -std is set to a conforming mode.
1022   Opts.Trigraphs = !Opts.GNUMode;
1023 
1024   Opts.DollarIdents = !Opts.AsmPreprocessor;
1025 }
1026 
1027 /// Attempt to parse a visibility value out of the given argument.
1028 static Visibility parseVisibility(Arg *arg, ArgList &args,
1029                                   DiagnosticsEngine &diags) {
1030   StringRef value = arg->getValue();
1031   if (value == "default") {
1032     return DefaultVisibility;
1033   } else if (value == "hidden") {
1034     return HiddenVisibility;
1035   } else if (value == "protected") {
1036     // FIXME: diagnose if target does not support protected visibility
1037     return ProtectedVisibility;
1038   }
1039 
1040   diags.Report(diag::err_drv_invalid_value)
1041     << arg->getAsString(args) << value;
1042   return DefaultVisibility;
1043 }
1044 
1045 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1046                           DiagnosticsEngine &Diags) {
1047   // FIXME: Cleanup per-file based stuff.
1048   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1049   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1050     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1051 #define LANGSTANDARD(id, name, desc, features) \
1052       .Case(name, LangStandard::lang_##id)
1053 #include "clang/Frontend/LangStandards.def"
1054       .Default(LangStandard::lang_unspecified);
1055     if (LangStd == LangStandard::lang_unspecified)
1056       Diags.Report(diag::err_drv_invalid_value)
1057         << A->getAsString(Args) << A->getValue();
1058     else {
1059       // Valid standard, check to make sure language and standard are compatable.
1060       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1061       switch (IK) {
1062       case IK_C:
1063       case IK_ObjC:
1064       case IK_PreprocessedC:
1065       case IK_PreprocessedObjC:
1066         if (!(Std.isC89() || Std.isC99()))
1067           Diags.Report(diag::err_drv_argument_not_allowed_with)
1068             << A->getAsString(Args) << "C/ObjC";
1069         break;
1070       case IK_CXX:
1071       case IK_ObjCXX:
1072       case IK_PreprocessedCXX:
1073       case IK_PreprocessedObjCXX:
1074         if (!Std.isCPlusPlus())
1075           Diags.Report(diag::err_drv_argument_not_allowed_with)
1076             << A->getAsString(Args) << "C++/ObjC++";
1077         break;
1078       case IK_OpenCL:
1079         if (!Std.isC99())
1080           Diags.Report(diag::err_drv_argument_not_allowed_with)
1081             << A->getAsString(Args) << "OpenCL";
1082         break;
1083       case IK_CUDA:
1084         if (!Std.isCPlusPlus())
1085           Diags.Report(diag::err_drv_argument_not_allowed_with)
1086             << A->getAsString(Args) << "CUDA";
1087         break;
1088       default:
1089         break;
1090       }
1091     }
1092   }
1093 
1094   // -cl-std only applies for OpenCL language standards.
1095   // Override the -std option in this case.
1096   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1097     LangStandard::Kind OpenCLLangStd
1098     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1099     .Case("CL", LangStandard::lang_opencl)
1100     .Case("CL1.1", LangStandard::lang_opencl11)
1101     .Case("CL1.2", LangStandard::lang_opencl12)
1102     .Default(LangStandard::lang_unspecified);
1103 
1104     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1105       Diags.Report(diag::err_drv_invalid_value)
1106       << A->getAsString(Args) << A->getValue();
1107     }
1108     else
1109       LangStd = OpenCLLangStd;
1110   }
1111 
1112   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1113 
1114   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1115   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1116   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1117   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1118   // name, as it doesn't seem a useful distinction.
1119   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1120                                   Opts.GNUKeywords);
1121 
1122   if (Args.hasArg(OPT_fno_operator_names))
1123     Opts.CXXOperatorNames = 0;
1124 
1125   if (Opts.ObjC1) {
1126     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1127       StringRef value = arg->getValue();
1128       if (Opts.ObjCRuntime.tryParse(value))
1129         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1130     }
1131 
1132     if (Args.hasArg(OPT_fobjc_gc_only))
1133       Opts.setGC(LangOptions::GCOnly);
1134     else if (Args.hasArg(OPT_fobjc_gc))
1135       Opts.setGC(LangOptions::HybridGC);
1136     else if (Args.hasArg(OPT_fobjc_arc)) {
1137       Opts.ObjCAutoRefCount = 1;
1138       if (!Opts.ObjCRuntime.allowsARC())
1139         Diags.Report(diag::err_arc_unsupported_on_runtime);
1140 
1141       // Only set ObjCARCWeak if ARC is enabled.
1142       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1143         Opts.ObjCARCWeak = 1;
1144       else
1145         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1146     }
1147 
1148     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1149       Opts.ObjCInferRelatedResultType = 0;
1150   }
1151 
1152   if (Args.hasArg(OPT_fgnu89_inline))
1153     Opts.GNUInline = 1;
1154 
1155   if (Args.hasArg(OPT_fapple_kext)) {
1156     if (!Opts.CPlusPlus)
1157       Diags.Report(diag::warn_c_kext);
1158     else
1159       Opts.AppleKext = 1;
1160   }
1161 
1162   if (Args.hasArg(OPT_print_ivar_layout))
1163     Opts.ObjCGCBitmapPrint = 1;
1164   if (Args.hasArg(OPT_fno_constant_cfstrings))
1165     Opts.NoConstantCFStrings = 1;
1166 
1167   if (Args.hasArg(OPT_faltivec))
1168     Opts.AltiVec = 1;
1169 
1170   if (Args.hasArg(OPT_pthread))
1171     Opts.POSIXThreads = 1;
1172 
1173   if (Args.hasArg(OPT_fdelayed_template_parsing))
1174     Opts.DelayedTemplateParsing = 1;
1175 
1176   // The value-visibility mode defaults to "default".
1177   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1178     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1179   } else {
1180     Opts.setValueVisibilityMode(DefaultVisibility);
1181   }
1182 
1183   // The type-visibility mode defaults to the value-visibility mode.
1184   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1185     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1186   } else {
1187     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1188   }
1189 
1190   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1191     Opts.InlineVisibilityHidden = 1;
1192 
1193   if (Args.hasArg(OPT_ftrapv)) {
1194     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1195     // Set the handler, if one is specified.
1196     Opts.OverflowHandler =
1197         Args.getLastArgValue(OPT_ftrapv_handler);
1198   }
1199   else if (Args.hasArg(OPT_fwrapv))
1200     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1201 
1202   if (Args.hasArg(OPT_trigraphs))
1203     Opts.Trigraphs = 1;
1204 
1205   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1206                                    OPT_fno_dollars_in_identifiers,
1207                                    Opts.DollarIdents);
1208   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1209   Opts.MicrosoftExt
1210     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1211   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1212   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1213   Opts.MSCVersion = Args.getLastArgIntValue(OPT_fmsc_version, 0, Diags);
1214   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1215   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1216   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1217                                    Opts.ConstStrings);
1218   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1219     Opts.LaxVectorConversions = 0;
1220   if (Args.hasArg(OPT_fno_threadsafe_statics))
1221     Opts.ThreadsafeStatics = 0;
1222   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1223   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1224   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1225   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1226   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1227 
1228   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1229   Opts.Blocks = Args.hasArg(OPT_fblocks);
1230   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1231   Opts.Modules = Args.hasArg(OPT_fmodules);
1232   Opts.CharIsSigned = !Args.hasArg(OPT_fno_signed_char);
1233   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1234   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1235   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1236   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1237   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1238   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1239   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1240   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1241   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1242   Opts.MathErrno = Args.hasArg(OPT_fmath_errno);
1243   Opts.InstantiationDepth = Args.getLastArgIntValue(OPT_ftemplate_depth, 512,
1244                                                     Diags);
1245   Opts.ConstexprCallDepth = Args.getLastArgIntValue(OPT_fconstexpr_depth, 512,
1246                                                     Diags);
1247   Opts.BracketDepth = Args.getLastArgIntValue(OPT_fbracket_depth, 256, Diags);
1248   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1249   Opts.NumLargeByValueCopy = Args.getLastArgIntValue(OPT_Wlarge_by_value_copy_EQ,
1250                                                     0, Diags);
1251   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1252   Opts.ObjCConstantStringClass =
1253     Args.getLastArgValue(OPT_fconstant_string_class);
1254   Opts.ObjCDefaultSynthProperties =
1255     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1256   Opts.EncodeExtendedBlockSig =
1257     Args.hasArg(OPT_fencode_extended_block_signature);
1258   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1259   Opts.PackStruct = Args.getLastArgIntValue(OPT_fpack_struct_EQ, 0, Diags);
1260   Opts.PICLevel = Args.getLastArgIntValue(OPT_pic_level, 0, Diags);
1261   Opts.PIELevel = Args.getLastArgIntValue(OPT_pie_level, 0, Diags);
1262   Opts.Static = Args.hasArg(OPT_static_define);
1263   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1264   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1265                         || Args.hasArg(OPT_fdump_record_layouts);
1266   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1267   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1268   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1269   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1270   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1271   Opts.MRTD = Args.hasArg(OPT_mrtd);
1272   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1273   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1274   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1275   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1276   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1277   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1278   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1279   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1280 
1281   // Check if -fopenmp is specified.
1282   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1283 
1284   // Record whether the __DEPRECATED define was requested.
1285   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1286                                  OPT_fno_deprecated_macro,
1287                                  Opts.Deprecated);
1288 
1289   // FIXME: Eliminate this dependency.
1290   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1291        OptSize = getOptimizationLevelSize(Args, IK, Diags);
1292   Opts.Optimize = Opt != 0;
1293   Opts.OptimizeSize = OptSize != 0;
1294 
1295   // This is the __NO_INLINE__ define, which just depends on things like the
1296   // optimization level and -fno-inline, not actually whether the backend has
1297   // inlining enabled.
1298   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1299 
1300   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1301   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1302 
1303   Opts.RetainCommentsFromSystemHeaders =
1304       Args.hasArg(OPT_fretain_comments_from_system_headers);
1305 
1306   unsigned SSP = Args.getLastArgIntValue(OPT_stack_protector, 0, Diags);
1307   switch (SSP) {
1308   default:
1309     Diags.Report(diag::err_drv_invalid_value)
1310       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1311     break;
1312   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1313   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1314   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1315   }
1316 
1317   // Parse -fsanitize= arguments.
1318   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1319   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1320     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1321     // efficiently map string values to them. Perform the mapping indirectly:
1322     // convert strings to enumerated values, then switch over the enum to set
1323     // the right bitfield value.
1324     enum Sanitizer {
1325 #define SANITIZER(NAME, ID) \
1326       ID,
1327 #include "clang/Basic/Sanitizers.def"
1328       Unknown
1329     };
1330     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1331 #define SANITIZER(NAME, ID) \
1332               .Case(NAME, ID)
1333 #include "clang/Basic/Sanitizers.def"
1334               .Default(Unknown)) {
1335 #define SANITIZER(NAME, ID) \
1336     case ID: \
1337       Opts.Sanitize.ID = true; \
1338       break;
1339 #include "clang/Basic/Sanitizers.def"
1340 
1341     case Unknown:
1342       Diags.Report(diag::err_drv_invalid_value)
1343         << "-fsanitize=" << Sanitizers[I];
1344       break;
1345     }
1346   }
1347 }
1348 
1349 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1350                                   FileManager &FileMgr,
1351                                   DiagnosticsEngine &Diags) {
1352   using namespace options;
1353   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1354   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1355   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1356       Opts.TokenCache = A->getValue();
1357   else
1358     Opts.TokenCache = Opts.ImplicitPTHInclude;
1359   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1360   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1361   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1362 
1363   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1364   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1365          ie = Args.filtered_end(); it != ie; ++it) {
1366     const Arg *A = *it;
1367     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1368   }
1369 
1370   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1371     StringRef Value(A->getValue());
1372     size_t Comma = Value.find(',');
1373     unsigned Bytes = 0;
1374     unsigned EndOfLine = 0;
1375 
1376     if (Comma == StringRef::npos ||
1377         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1378         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1379       Diags.Report(diag::err_drv_preamble_format);
1380     else {
1381       Opts.PrecompiledPreambleBytes.first = Bytes;
1382       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1383     }
1384   }
1385 
1386   // Add macros from the command line.
1387   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1388          ie = Args.filtered_end(); it != ie; ++it) {
1389     if ((*it)->getOption().matches(OPT_D))
1390       Opts.addMacroDef((*it)->getValue());
1391     else
1392       Opts.addMacroUndef((*it)->getValue());
1393   }
1394 
1395   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1396 
1397   // Add the ordered list of -includes.
1398   for (arg_iterator it = Args.filtered_begin(OPT_include),
1399          ie = Args.filtered_end(); it != ie; ++it) {
1400     const Arg *A = *it;
1401     Opts.Includes.push_back(A->getValue());
1402   }
1403 
1404   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1405          ie = Args.filtered_end(); it != ie; ++it) {
1406     const Arg *A = *it;
1407     Opts.ChainedIncludes.push_back(A->getValue());
1408   }
1409 
1410   // Include 'altivec.h' if -faltivec option present
1411   if (Args.hasArg(OPT_faltivec))
1412     Opts.Includes.push_back("altivec.h");
1413 
1414   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1415          ie = Args.filtered_end(); it != ie; ++it) {
1416     const Arg *A = *it;
1417     std::pair<StringRef,StringRef> Split =
1418       StringRef(A->getValue()).split(';');
1419 
1420     if (Split.second.empty()) {
1421       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1422       continue;
1423     }
1424 
1425     Opts.addRemappedFile(Split.first, Split.second);
1426   }
1427 
1428   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1429     StringRef Name = A->getValue();
1430     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1431       .Case("libc++", ARCXX_libcxx)
1432       .Case("libstdc++", ARCXX_libstdcxx)
1433       .Case("none", ARCXX_nolib)
1434       .Default(~0U);
1435     if (Library == ~0U)
1436       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1437     else
1438       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1439   }
1440 }
1441 
1442 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1443                                         ArgList &Args,
1444                                         frontend::ActionKind Action) {
1445   using namespace options;
1446 
1447   switch (Action) {
1448   case frontend::ASTDeclList:
1449   case frontend::ASTDump:
1450   case frontend::ASTDumpXML:
1451   case frontend::ASTPrint:
1452   case frontend::ASTView:
1453   case frontend::EmitAssembly:
1454   case frontend::EmitBC:
1455   case frontend::EmitHTML:
1456   case frontend::EmitLLVM:
1457   case frontend::EmitLLVMOnly:
1458   case frontend::EmitCodeGenOnly:
1459   case frontend::EmitObj:
1460   case frontend::FixIt:
1461   case frontend::GenerateModule:
1462   case frontend::GeneratePCH:
1463   case frontend::GeneratePTH:
1464   case frontend::ParseSyntaxOnly:
1465   case frontend::PluginAction:
1466   case frontend::PrintDeclContext:
1467   case frontend::RewriteObjC:
1468   case frontend::RewriteTest:
1469   case frontend::RunAnalysis:
1470   case frontend::MigrateSource:
1471     Opts.ShowCPP = 0;
1472     break;
1473 
1474   case frontend::DumpRawTokens:
1475   case frontend::DumpTokens:
1476   case frontend::InitOnly:
1477   case frontend::PrintPreamble:
1478   case frontend::PrintPreprocessedInput:
1479   case frontend::RewriteMacros:
1480   case frontend::RunPreprocessorOnly:
1481     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1482     break;
1483   }
1484 
1485   Opts.ShowComments = Args.hasArg(OPT_C);
1486   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1487   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1488   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1489   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1490 }
1491 
1492 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1493   using namespace options;
1494   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1495   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1496   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1497   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1498   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1499   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1500 
1501   // Use the default target triple if unspecified.
1502   if (Opts.Triple.empty())
1503     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1504 }
1505 
1506 //
1507 
1508 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1509                                         const char *const *ArgBegin,
1510                                         const char *const *ArgEnd,
1511                                         DiagnosticsEngine &Diags) {
1512   bool Success = true;
1513 
1514   // Parse the arguments.
1515   OwningPtr<OptTable> Opts(createDriverOptTable());
1516   unsigned MissingArgIndex, MissingArgCount;
1517   OwningPtr<InputArgList> Args(
1518     Opts->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
1519 
1520   // Check for missing argument error.
1521   if (MissingArgCount) {
1522     Diags.Report(diag::err_drv_missing_argument)
1523       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1524     Success = false;
1525   }
1526 
1527   // Issue errors on unknown arguments.
1528   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1529          ie = Args->filtered_end(); it != ie; ++it) {
1530     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1531     Success = false;
1532   }
1533 
1534   // Issue errors on arguments that are not valid for CC1.
1535   for (ArgList::iterator I = Args->begin(), E = Args->end();
1536        I != E; ++I) {
1537     if (!(*I)->getOption().hasFlag(options::CC1Option)) {
1538       Diags.Report(diag::err_drv_unknown_argument) << (*I)->getAsString(*Args);
1539       Success = false;
1540     }
1541   }
1542 
1543   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1544   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1545   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1546   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1547             && Success;
1548   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1549   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1550   // FIXME: We shouldn't have to pass the DashX option around here
1551   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1552   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1553             && Success;
1554   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1555   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1556     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1557     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1558       Res.getLangOpts()->ObjCExceptions = 1;
1559   }
1560   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1561   // PCH file and find the original header name. Remove the need to do that in
1562   // ParsePreprocessorArgs and remove the FileManager
1563   // parameters from the function and the "FileManager.h" #include.
1564   FileManager FileMgr(Res.getFileSystemOpts());
1565   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1566   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1567                               Res.getFrontendOpts().ProgramAction);
1568   ParseTargetArgs(Res.getTargetOpts(), *Args);
1569 
1570   return Success;
1571 }
1572 
1573 namespace {
1574 
1575   class ModuleSignature {
1576     SmallVector<uint64_t, 16> Data;
1577     unsigned CurBit;
1578     uint64_t CurValue;
1579 
1580   public:
1581     ModuleSignature() : CurBit(0), CurValue(0) { }
1582 
1583     void add(uint64_t Value, unsigned Bits);
1584     void add(StringRef Value);
1585     void flush();
1586 
1587     llvm::APInt getAsInteger() const;
1588   };
1589 }
1590 
1591 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1592   CurValue |= Value << CurBit;
1593   if (CurBit + NumBits < 64) {
1594     CurBit += NumBits;
1595     return;
1596   }
1597 
1598   // Add the current word.
1599   Data.push_back(CurValue);
1600 
1601   if (CurBit)
1602     CurValue = Value >> (64-CurBit);
1603   else
1604     CurValue = 0;
1605   CurBit = (CurBit+NumBits) & 63;
1606 }
1607 
1608 void ModuleSignature::flush() {
1609   if (CurBit == 0)
1610     return;
1611 
1612   Data.push_back(CurValue);
1613   CurBit = 0;
1614   CurValue = 0;
1615 }
1616 
1617 void ModuleSignature::add(StringRef Value) {
1618   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1619     add(*I, 8);
1620 }
1621 
1622 llvm::APInt ModuleSignature::getAsInteger() const {
1623   return llvm::APInt(Data.size() * 64, Data);
1624 }
1625 
1626 std::string CompilerInvocation::getModuleHash() const {
1627   using llvm::hash_code;
1628   using llvm::hash_value;
1629   using llvm::hash_combine;
1630 
1631   // Start the signature with the compiler version.
1632   // FIXME: We'd rather use something more cryptographically sound than
1633   // CityHash, but this will do for now.
1634   hash_code code = hash_value(getClangFullRepositoryVersion());
1635 
1636   // Extend the signature with the language options
1637 #define LANGOPT(Name, Bits, Default, Description) \
1638    code = hash_combine(code, LangOpts->Name);
1639 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1640   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1641 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1642 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1643 #include "clang/Basic/LangOptions.def"
1644 
1645   // Extend the signature with the target options.
1646   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1647                       TargetOpts->ABI, TargetOpts->CXXABI,
1648                       TargetOpts->LinkerVersion);
1649   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1650     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1651 
1652   // Extend the signature with preprocessor options.
1653   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1654   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1655   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1656 
1657   std::vector<StringRef> MacroDefs;
1658   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1659             I = getPreprocessorOpts().Macros.begin(),
1660          IEnd = getPreprocessorOpts().Macros.end();
1661        I != IEnd; ++I) {
1662     // If we're supposed to ignore this macro for the purposes of modules,
1663     // don't put it into the hash.
1664     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1665       // Check whether we're ignoring this macro.
1666       StringRef MacroDef = I->first;
1667       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1668         continue;
1669     }
1670 
1671     code = hash_combine(code, I->first, I->second);
1672   }
1673 
1674   // Extend the signature with the sysroot.
1675   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1676                       hsOpts.UseStandardSystemIncludes,
1677                       hsOpts.UseStandardCXXIncludes,
1678                       hsOpts.UseLibcxx);
1679 
1680   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1681 }
1682