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_ipa)) {
192     StringRef Name = A->getValue();
193     AnalysisIPAMode Value = llvm::StringSwitch<AnalysisIPAMode>(Name)
194 #define ANALYSIS_IPA(NAME, CMDFLAG, DESC) \
195       .Case(CMDFLAG, NAME)
196 #include "clang/StaticAnalyzer/Core/Analyses.def"
197       .Default(NumIPAModes);
198     if (Value == NumIPAModes) {
199       Diags.Report(diag::err_drv_invalid_value)
200         << A->getAsString(Args) << Name;
201       Success = false;
202     } else {
203       Opts.IPAMode = Value;
204     }
205   }
206 
207   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
208     StringRef Name = A->getValue();
209     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
210 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
211       .Case(CMDFLAG, NAME)
212 #include "clang/StaticAnalyzer/Core/Analyses.def"
213       .Default(NumInliningModes);
214     if (Value == NumInliningModes) {
215       Diags.Report(diag::err_drv_invalid_value)
216         << A->getAsString(Args) << Name;
217       Success = false;
218     } else {
219       Opts.InliningMode = Value;
220     }
221   }
222 
223   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
224   Opts.visualizeExplodedGraphWithGraphViz =
225     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
226   Opts.visualizeExplodedGraphWithUbiGraph =
227     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
228   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
229   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
230   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
231   Opts.AnalyzeNestedBlocks =
232     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
233   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
234   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
235   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
236   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
237   Opts.MaxNodes = Args.getLastArgIntValue(OPT_analyzer_max_nodes, 150000,Diags);
238   Opts.maxBlockVisitOnPath = Args.getLastArgIntValue(OPT_analyzer_max_loop, 4, Diags);
239   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
240   Opts.InlineMaxStackDepth =
241     Args.getLastArgIntValue(OPT_analyzer_inline_max_stack_depth,
242                             Opts.InlineMaxStackDepth, Diags);
243   Opts.InlineMaxFunctionSize =
244     Args.getLastArgIntValue(OPT_analyzer_inline_max_function_size,
245                             Opts.InlineMaxFunctionSize, Diags);
246 
247   Opts.CheckersControlList.clear();
248   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
249                                              OPT_analyzer_disable_checker),
250          ie = Args.filtered_end(); it != ie; ++it) {
251     const Arg *A = *it;
252     A->claim();
253     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
254     // We can have a list of comma separated checker names, e.g:
255     // '-analyzer-checker=cocoa,unix'
256     StringRef checkerList = A->getValue();
257     SmallVector<StringRef, 4> checkers;
258     checkerList.split(checkers, ",");
259     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
260       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
261   }
262 
263   // Go through the analyzer configuration options.
264   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
265        ie = Args.filtered_end(); it != ie; ++it) {
266     const Arg *A = *it;
267     A->claim();
268     // We can have a list of comma separated config names, e.g:
269     // '-analyzer-config key1=val1,key2=val2'
270     StringRef configList = A->getValue();
271     SmallVector<StringRef, 4> configVals;
272     configList.split(configVals, ",");
273     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
274       StringRef key, val;
275       llvm::tie(key, val) = configVals[i].split("=");
276       if (val.empty()) {
277         Diags.Report(SourceLocation(),
278                      diag::err_analyzer_config_no_value) << configVals[i];
279         Success = false;
280         break;
281       }
282       if (val.find('=') != StringRef::npos) {
283         Diags.Report(SourceLocation(),
284                      diag::err_analyzer_config_multiple_values)
285           << configVals[i];
286         Success = false;
287         break;
288       }
289       Opts.Config[key] = val;
290     }
291   }
292 
293   return Success;
294 }
295 
296 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
297   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
298   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
299   return true;
300 }
301 
302 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
303                              DiagnosticsEngine &Diags) {
304   using namespace options;
305   bool Success = true;
306 
307   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
308   if (OptLevel > 3) {
309     Diags.Report(diag::err_drv_invalid_value)
310       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
311     OptLevel = 3;
312     Success = false;
313   }
314   Opts.OptimizationLevel = OptLevel;
315 
316   // We must always run at least the always inlining pass.
317   Opts.setInlining(
318     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
319                                  : CodeGenOptions::OnlyAlwaysInlining);
320   // -fno-inline-functions overrides OptimizationLevel > 1.
321   Opts.NoInline = Args.hasArg(OPT_fno_inline);
322   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
323                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
324 
325   if (Args.hasArg(OPT_gline_tables_only)) {
326     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
327   } else if (Args.hasArg(OPT_g_Flag)) {
328     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
329       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
330     else
331       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
332   }
333   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
334 
335   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
336   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
337   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
338   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
339     OPT_fuse_register_sized_bitfield_access);
340   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
341   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
342   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
343   Opts.NoCommon = Args.hasArg(OPT_fno_common);
344   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
345   Opts.OptimizeSize = getOptimizationLevelSize(Args, IK, Diags);
346   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
347                             Args.hasArg(OPT_ffreestanding));
348   Opts.UnrollLoops = Args.hasArg(OPT_funroll_loops) ||
349                      (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize);
350 
351   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
352   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
353   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
354   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
355   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
356   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
357   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
358   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
359   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
360   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
361   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
362   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
363   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
364   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
365                        Args.hasArg(OPT_cl_finite_math_only)||
366                        Args.hasArg(OPT_cl_fast_relaxed_math));
367   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
368                        Args.hasArg(OPT_cl_finite_math_only)||
369                        Args.hasArg(OPT_cl_fast_relaxed_math));
370   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
371   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
372   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);
373   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
374   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
375   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
376   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
377   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
378   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
379   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
380   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
381   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
382   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
383                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
384                       Args.hasArg(OPT_cl_fast_relaxed_math);
385   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
386   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
387   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
388   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
389 
390   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
391   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
392 
393   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
394   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
395   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
396 
397   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
398   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
399   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
400   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
401   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
402   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
403   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
404   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
405   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
406   Opts.MemorySanitizerTrackOrigins =
407     Args.hasArg(OPT_fsanitize_memory_track_origins);
408   Opts.SSPBufferSize =
409     Args.getLastArgIntValue(OPT_stack_protector_buffer_size, 8, Diags);
410   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
411   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
412     StringRef Val = A->getValue();
413     unsigned StackAlignment = Opts.StackAlignment;
414     Val.getAsInteger(10, StackAlignment);
415     Opts.StackAlignment = StackAlignment;
416   }
417 
418   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
419     StringRef Name = A->getValue();
420     unsigned Method = llvm::StringSwitch<unsigned>(Name)
421       .Case("legacy", CodeGenOptions::Legacy)
422       .Case("non-legacy", CodeGenOptions::NonLegacy)
423       .Case("mixed", CodeGenOptions::Mixed)
424       .Default(~0U);
425     if (Method == ~0U) {
426       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
427       Success = false;
428     } else {
429       Opts.setObjCDispatchMethod(
430         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
431     }
432   }
433 
434   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
435     StringRef Name = A->getValue();
436     unsigned Model = llvm::StringSwitch<unsigned>(Name)
437         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
438         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
439         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
440         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
441         .Default(~0U);
442     if (Model == ~0U) {
443       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
444       Success = false;
445     } else {
446       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
447     }
448   }
449 
450   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
451     StringRef Val = A->getValue();
452     if (Val == "fast")
453       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
454     else if (Val == "on")
455       Opts.setFPContractMode(CodeGenOptions::FPC_On);
456     else if (Val == "off")
457       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
458     else
459       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
460   }
461 
462   return Success;
463 }
464 
465 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
466                                       ArgList &Args) {
467   using namespace options;
468   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
469   Opts.Targets = Args.getAllArgValues(OPT_MT);
470   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
471   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
472   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
473   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
474   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
475   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
476 }
477 
478 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
479                                 DiagnosticsEngine *Diags) {
480   using namespace options;
481   bool Success = true;
482 
483   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
484   Opts.DiagnosticSerializationFile =
485     Args.getLastArgValue(OPT_diagnostic_serialized_file);
486   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
487   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
488   Opts.Pedantic = Args.hasArg(OPT_pedantic);
489   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
490   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
491   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
492   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
493                                  OPT_fno_show_column,
494                                  /*Default=*/true);
495   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
496   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
497   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
498 
499   // Default behavior is to not to show note include stacks.
500   Opts.ShowNoteIncludeStack = false;
501   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
502                                OPT_fno_diagnostics_show_note_include_stack))
503     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
504       Opts.ShowNoteIncludeStack = true;
505 
506   StringRef ShowOverloads =
507     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
508   if (ShowOverloads == "best")
509     Opts.setShowOverloads(Ovl_Best);
510   else if (ShowOverloads == "all")
511     Opts.setShowOverloads(Ovl_All);
512   else {
513     Success = false;
514     if (Diags)
515       Diags->Report(diag::err_drv_invalid_value)
516       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
517       << ShowOverloads;
518   }
519 
520   StringRef ShowCategory =
521     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
522   if (ShowCategory == "none")
523     Opts.ShowCategories = 0;
524   else if (ShowCategory == "id")
525     Opts.ShowCategories = 1;
526   else if (ShowCategory == "name")
527     Opts.ShowCategories = 2;
528   else {
529     Success = false;
530     if (Diags)
531       Diags->Report(diag::err_drv_invalid_value)
532       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
533       << ShowCategory;
534   }
535 
536   StringRef Format =
537     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
538   if (Format == "clang")
539     Opts.setFormat(DiagnosticOptions::Clang);
540   else if (Format == "msvc")
541     Opts.setFormat(DiagnosticOptions::Msvc);
542   else if (Format == "vi")
543     Opts.setFormat(DiagnosticOptions::Vi);
544   else {
545     Success = false;
546     if (Diags)
547       Diags->Report(diag::err_drv_invalid_value)
548       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
549       << Format;
550   }
551 
552   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
553   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
554   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
555   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
556   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
557   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
558   Opts.ErrorLimit = Args.getLastArgIntValue(OPT_ferror_limit, 0, Diags);
559   Opts.MacroBacktraceLimit
560     = Args.getLastArgIntValue(OPT_fmacro_backtrace_limit,
561                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
562   Opts.TemplateBacktraceLimit
563     = Args.getLastArgIntValue(OPT_ftemplate_backtrace_limit,
564                          DiagnosticOptions::DefaultTemplateBacktraceLimit,
565                          Diags);
566   Opts.ConstexprBacktraceLimit
567     = Args.getLastArgIntValue(OPT_fconstexpr_backtrace_limit,
568                          DiagnosticOptions::DefaultConstexprBacktraceLimit,
569                          Diags);
570   Opts.TabStop = Args.getLastArgIntValue(OPT_ftabstop,
571                                     DiagnosticOptions::DefaultTabStop, Diags);
572   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
573     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
574     if (Diags)
575       Diags->Report(diag::warn_ignoring_ftabstop_value)
576       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
577   }
578   Opts.MessageLength = Args.getLastArgIntValue(OPT_fmessage_length, 0, Diags);
579   Opts.DumpBuildInformation = Args.getLastArgValue(OPT_dump_build_information);
580   addWarningArgs(Args, Opts.Warnings);
581 
582   return Success;
583 }
584 
585 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
586   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
587 }
588 
589 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
590                                    DiagnosticsEngine &Diags) {
591   using namespace options;
592   Opts.ProgramAction = frontend::ParseSyntaxOnly;
593   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
594     switch (A->getOption().getID()) {
595     default:
596       llvm_unreachable("Invalid option in group!");
597     case OPT_ast_list:
598       Opts.ProgramAction = frontend::ASTDeclList; break;
599     case OPT_ast_dump:
600       Opts.ProgramAction = frontend::ASTDump; break;
601     case OPT_ast_dump_xml:
602       Opts.ProgramAction = frontend::ASTDumpXML; break;
603     case OPT_ast_print:
604       Opts.ProgramAction = frontend::ASTPrint; break;
605     case OPT_ast_view:
606       Opts.ProgramAction = frontend::ASTView; break;
607     case OPT_dump_raw_tokens:
608       Opts.ProgramAction = frontend::DumpRawTokens; break;
609     case OPT_dump_tokens:
610       Opts.ProgramAction = frontend::DumpTokens; break;
611     case OPT_S:
612       Opts.ProgramAction = frontend::EmitAssembly; break;
613     case OPT_emit_llvm_bc:
614       Opts.ProgramAction = frontend::EmitBC; break;
615     case OPT_emit_html:
616       Opts.ProgramAction = frontend::EmitHTML; break;
617     case OPT_emit_llvm:
618       Opts.ProgramAction = frontend::EmitLLVM; break;
619     case OPT_emit_llvm_only:
620       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
621     case OPT_emit_codegen_only:
622       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
623     case OPT_emit_obj:
624       Opts.ProgramAction = frontend::EmitObj; break;
625     case OPT_fixit_EQ:
626       Opts.FixItSuffix = A->getValue();
627       // fall-through!
628     case OPT_fixit:
629       Opts.ProgramAction = frontend::FixIt; break;
630     case OPT_emit_module:
631       Opts.ProgramAction = frontend::GenerateModule; break;
632     case OPT_emit_pch:
633       Opts.ProgramAction = frontend::GeneratePCH; break;
634     case OPT_emit_pth:
635       Opts.ProgramAction = frontend::GeneratePTH; break;
636     case OPT_init_only:
637       Opts.ProgramAction = frontend::InitOnly; break;
638     case OPT_fsyntax_only:
639       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
640     case OPT_print_decl_contexts:
641       Opts.ProgramAction = frontend::PrintDeclContext; break;
642     case OPT_print_preamble:
643       Opts.ProgramAction = frontend::PrintPreamble; break;
644     case OPT_E:
645       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
646     case OPT_rewrite_macros:
647       Opts.ProgramAction = frontend::RewriteMacros; break;
648     case OPT_rewrite_objc:
649       Opts.ProgramAction = frontend::RewriteObjC; break;
650     case OPT_rewrite_test:
651       Opts.ProgramAction = frontend::RewriteTest; break;
652     case OPT_analyze:
653       Opts.ProgramAction = frontend::RunAnalysis; break;
654     case OPT_migrate:
655       Opts.ProgramAction = frontend::MigrateSource; break;
656     case OPT_Eonly:
657       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
658     }
659   }
660 
661   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
662     Opts.Plugins.push_back(A->getValue(0));
663     Opts.ProgramAction = frontend::PluginAction;
664     Opts.ActionName = A->getValue();
665 
666     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
667            end = Args.filtered_end(); it != end; ++it) {
668       if ((*it)->getValue(0) == Opts.ActionName)
669         Opts.PluginArgs.push_back((*it)->getValue(1));
670     }
671   }
672 
673   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
674   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
675   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
676     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
677            end = Args.filtered_end(); it != end; ++it) {
678       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
679         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
680     }
681   }
682 
683   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
684     Opts.CodeCompletionAt =
685       ParsedSourceLocation::FromString(A->getValue());
686     if (Opts.CodeCompletionAt.FileName.empty())
687       Diags.Report(diag::err_drv_invalid_value)
688         << A->getAsString(Args) << A->getValue();
689   }
690   Opts.DisableFree = Args.hasArg(OPT_disable_free);
691 
692   Opts.OutputFile = Args.getLastArgValue(OPT_o);
693   Opts.Plugins = Args.getAllArgValues(OPT_load);
694   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
695   Opts.ShowHelp = Args.hasArg(OPT_help);
696   Opts.ShowStats = Args.hasArg(OPT_print_stats);
697   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
698   Opts.ShowVersion = Args.hasArg(OPT_version);
699   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
700   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
701   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
702   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
703   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
704   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
705   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
706 
707   Opts.CodeCompleteOpts.IncludeMacros
708     = Args.hasArg(OPT_code_completion_macros);
709   Opts.CodeCompleteOpts.IncludeCodePatterns
710     = Args.hasArg(OPT_code_completion_patterns);
711   Opts.CodeCompleteOpts.IncludeGlobals
712     = !Args.hasArg(OPT_no_code_completion_globals);
713   Opts.CodeCompleteOpts.IncludeBriefComments
714     = Args.hasArg(OPT_code_completion_brief_comments);
715 
716   Opts.OverrideRecordLayoutsFile
717     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
718   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
719                                      OPT_arcmt_modify,
720                                      OPT_arcmt_migrate)) {
721     switch (A->getOption().getID()) {
722     default:
723       llvm_unreachable("missed a case");
724     case OPT_arcmt_check:
725       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
726       break;
727     case OPT_arcmt_modify:
728       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
729       break;
730     case OPT_arcmt_migrate:
731       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
732       break;
733     }
734   }
735   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
736   Opts.ARCMTMigrateReportOut
737     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
738   Opts.ARCMTMigrateEmitARCErrors
739     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
740 
741   if (Args.hasArg(OPT_objcmt_migrate_literals))
742     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
743   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
744     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
745 
746   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
747       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
748     Diags.Report(diag::err_drv_argument_not_allowed_with)
749       << "ARC migration" << "ObjC migration";
750   }
751 
752   InputKind DashX = IK_None;
753   if (const Arg *A = Args.getLastArg(OPT_x)) {
754     DashX = llvm::StringSwitch<InputKind>(A->getValue())
755       .Case("c", IK_C)
756       .Case("cl", IK_OpenCL)
757       .Case("cuda", IK_CUDA)
758       .Case("c++", IK_CXX)
759       .Case("objective-c", IK_ObjC)
760       .Case("objective-c++", IK_ObjCXX)
761       .Case("cpp-output", IK_PreprocessedC)
762       .Case("assembler-with-cpp", IK_Asm)
763       .Case("c++-cpp-output", IK_PreprocessedCXX)
764       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
765       .Case("objc-cpp-output", IK_PreprocessedObjC)
766       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
767       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
768       .Case("c-header", IK_C)
769       .Case("cl-header", IK_OpenCL)
770       .Case("objective-c-header", IK_ObjC)
771       .Case("c++-header", IK_CXX)
772       .Case("objective-c++-header", IK_ObjCXX)
773       .Case("ast", IK_AST)
774       .Case("ir", IK_LLVM_IR)
775       .Default(IK_None);
776     if (DashX == IK_None)
777       Diags.Report(diag::err_drv_invalid_value)
778         << A->getAsString(Args) << A->getValue();
779   }
780 
781   // '-' is the default input if none is given.
782   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
783   Opts.Inputs.clear();
784   if (Inputs.empty())
785     Inputs.push_back("-");
786   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
787     InputKind IK = DashX;
788     if (IK == IK_None) {
789       IK = FrontendOptions::getInputKindForExtension(
790         StringRef(Inputs[i]).rsplit('.').second);
791       // FIXME: Remove this hack.
792       if (i == 0)
793         DashX = IK;
794     }
795     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
796   }
797 
798   return DashX;
799 }
800 
801 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
802                                                  void *MainAddr) {
803   llvm::sys::Path P = llvm::sys::Path::GetMainExecutable(Argv0, MainAddr);
804 
805   if (!P.isEmpty()) {
806     P.eraseComponent();  // Remove /clang from foo/bin/clang
807     P.eraseComponent();  // Remove /bin   from foo/bin
808 
809     // Get foo/lib/clang/<version>/include
810     P.appendComponent("lib");
811     P.appendComponent("clang");
812     P.appendComponent(CLANG_VERSION_STRING);
813   }
814 
815   return P.str();
816 }
817 
818 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
819   using namespace options;
820   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
821   Opts.Verbose = Args.hasArg(OPT_v);
822   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
823   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
824   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
825   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
826     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
827   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
828   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodule_cache_path);
829   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
830 
831   // Add -I..., -F..., and -index-header-map options in order.
832   bool IsIndexHeaderMap = false;
833   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
834                                              OPT_index_header_map),
835        ie = Args.filtered_end(); it != ie; ++it) {
836     if ((*it)->getOption().matches(OPT_index_header_map)) {
837       // -index-header-map applies to the next -I or -F.
838       IsIndexHeaderMap = true;
839       continue;
840     }
841 
842     frontend::IncludeDirGroup Group
843       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
844 
845     Opts.AddPath((*it)->getValue(), Group, true,
846                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), false);
847     IsIndexHeaderMap = false;
848   }
849 
850   // Add -iprefix/-iwith-prefix/-iwithprefixbefore options.
851   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
852   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
853                                              OPT_iwithprefixbefore),
854          ie = Args.filtered_end(); it != ie; ++it) {
855     const Arg *A = *it;
856     if (A->getOption().matches(OPT_iprefix))
857       Prefix = A->getValue();
858     else if (A->getOption().matches(OPT_iwithprefix))
859       Opts.AddPath(Prefix.str() + A->getValue(),
860                    frontend::System, false, false, false);
861     else
862       Opts.AddPath(Prefix.str() + A->getValue(),
863                    frontend::Angled, false, false, false);
864   }
865 
866   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
867          ie = Args.filtered_end(); it != ie; ++it)
868     Opts.AddPath((*it)->getValue(), frontend::After, true, false, false);
869   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
870          ie = Args.filtered_end(); it != ie; ++it)
871     Opts.AddPath((*it)->getValue(), frontend::Quoted, true, false, false);
872   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
873          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
874     Opts.AddPath((*it)->getValue(), frontend::System, true, false,
875                  !(*it)->getOption().matches(OPT_iwithsysroot));
876   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
877          ie = Args.filtered_end(); it != ie; ++it)
878     Opts.AddPath((*it)->getValue(), frontend::System, true, true,
879                  true);
880 
881   // Add the paths for the various language specific isystem flags.
882   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
883        ie = Args.filtered_end(); it != ie; ++it)
884     Opts.AddPath((*it)->getValue(), frontend::CSystem, true, false, true);
885   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
886        ie = Args.filtered_end(); it != ie; ++it)
887     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, true, false, true);
888   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
889        ie = Args.filtered_end(); it != ie; ++it)
890     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, true, false,true);
891   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
892        ie = Args.filtered_end(); it != ie; ++it)
893     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, true, false,
894                  true);
895 
896   // Add the internal paths from a driver that detects standard include paths.
897   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
898                                             OPT_internal_externc_isystem),
899                     E = Args.filtered_end();
900        I != E; ++I)
901     Opts.AddPath((*I)->getValue(), frontend::System,
902                  false, false, /*IgnoreSysRoot=*/true, /*IsInternal=*/true,
903                  (*I)->getOption().matches(OPT_internal_externc_isystem));
904 
905   // Add the path prefixes which are implicitly treated as being system headers.
906   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
907                                             OPT_ino_system_prefix),
908                     E = Args.filtered_end();
909        I != E; ++I)
910     Opts.AddSystemHeaderPrefix((*I)->getValue(),
911                                (*I)->getOption().matches(OPT_isystem_prefix));
912 }
913 
914 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
915                                          LangStandard::Kind LangStd) {
916   // Set some properties which depend solely on the input kind; it would be nice
917   // to move these to the language standard, and have the driver resolve the
918   // input kind + language standard.
919   if (IK == IK_Asm) {
920     Opts.AsmPreprocessor = 1;
921   } else if (IK == IK_ObjC ||
922              IK == IK_ObjCXX ||
923              IK == IK_PreprocessedObjC ||
924              IK == IK_PreprocessedObjCXX) {
925     Opts.ObjC1 = Opts.ObjC2 = 1;
926   }
927 
928   if (LangStd == LangStandard::lang_unspecified) {
929     // Based on the base language, pick one.
930     switch (IK) {
931     case IK_None:
932     case IK_AST:
933     case IK_LLVM_IR:
934       llvm_unreachable("Invalid input kind!");
935     case IK_OpenCL:
936       LangStd = LangStandard::lang_opencl;
937       break;
938     case IK_CUDA:
939       LangStd = LangStandard::lang_cuda;
940       break;
941     case IK_Asm:
942     case IK_C:
943     case IK_PreprocessedC:
944     case IK_ObjC:
945     case IK_PreprocessedObjC:
946       LangStd = LangStandard::lang_gnu99;
947       break;
948     case IK_CXX:
949     case IK_PreprocessedCXX:
950     case IK_ObjCXX:
951     case IK_PreprocessedObjCXX:
952       LangStd = LangStandard::lang_gnucxx98;
953       break;
954     }
955   }
956 
957   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
958   Opts.LineComment = Std.hasLineComments();
959   Opts.C99 = Std.isC99();
960   Opts.C11 = Std.isC11();
961   Opts.CPlusPlus = Std.isCPlusPlus();
962   Opts.CPlusPlus11 = Std.isCPlusPlus11();
963   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
964   Opts.Digraphs = Std.hasDigraphs();
965   Opts.GNUMode = Std.isGNUMode();
966   Opts.GNUInline = !Std.isC99();
967   Opts.HexFloats = Std.hasHexFloats();
968   Opts.ImplicitInt = Std.hasImplicitInt();
969 
970   // Set OpenCL Version.
971   if (LangStd == LangStandard::lang_opencl) {
972     Opts.OpenCL = 1;
973     Opts.OpenCLVersion = 100;
974   }
975   else if (LangStd == LangStandard::lang_opencl11) {
976       Opts.OpenCL = 1;
977       Opts.OpenCLVersion = 110;
978   }
979   else if (LangStd == LangStandard::lang_opencl12) {
980     Opts.OpenCL = 1;
981     Opts.OpenCLVersion = 120;
982   }
983 
984   // OpenCL has some additional defaults.
985   if (Opts.OpenCL) {
986     Opts.AltiVec = 0;
987     Opts.CXXOperatorNames = 1;
988     Opts.LaxVectorConversions = 0;
989     Opts.DefaultFPContract = 1;
990   }
991 
992   if (LangStd == LangStandard::lang_cuda)
993     Opts.CUDA = 1;
994 
995   // OpenCL and C++ both have bool, true, false keywords.
996   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
997 
998   // C++ has wchar_t keyword.
999   Opts.WChar = Opts.CPlusPlus;
1000 
1001   Opts.GNUKeywords = Opts.GNUMode;
1002   Opts.CXXOperatorNames = Opts.CPlusPlus;
1003 
1004   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1005   // is specified, or -std is set to a conforming mode.
1006   Opts.Trigraphs = !Opts.GNUMode;
1007 
1008   Opts.DollarIdents = !Opts.AsmPreprocessor;
1009 }
1010 
1011 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1012                           DiagnosticsEngine &Diags) {
1013   // FIXME: Cleanup per-file based stuff.
1014   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1015   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1016     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1017 #define LANGSTANDARD(id, name, desc, features) \
1018       .Case(name, LangStandard::lang_##id)
1019 #include "clang/Frontend/LangStandards.def"
1020       .Default(LangStandard::lang_unspecified);
1021     if (LangStd == LangStandard::lang_unspecified)
1022       Diags.Report(diag::err_drv_invalid_value)
1023         << A->getAsString(Args) << A->getValue();
1024     else {
1025       // Valid standard, check to make sure language and standard are compatable.
1026       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1027       switch (IK) {
1028       case IK_C:
1029       case IK_ObjC:
1030       case IK_PreprocessedC:
1031       case IK_PreprocessedObjC:
1032         if (!(Std.isC89() || Std.isC99()))
1033           Diags.Report(diag::err_drv_argument_not_allowed_with)
1034             << A->getAsString(Args) << "C/ObjC";
1035         break;
1036       case IK_CXX:
1037       case IK_ObjCXX:
1038       case IK_PreprocessedCXX:
1039       case IK_PreprocessedObjCXX:
1040         if (!Std.isCPlusPlus())
1041           Diags.Report(diag::err_drv_argument_not_allowed_with)
1042             << A->getAsString(Args) << "C++/ObjC++";
1043         break;
1044       case IK_OpenCL:
1045         if (!Std.isC99())
1046           Diags.Report(diag::err_drv_argument_not_allowed_with)
1047             << A->getAsString(Args) << "OpenCL";
1048         break;
1049       case IK_CUDA:
1050         if (!Std.isCPlusPlus())
1051           Diags.Report(diag::err_drv_argument_not_allowed_with)
1052             << A->getAsString(Args) << "CUDA";
1053         break;
1054       default:
1055         break;
1056       }
1057     }
1058   }
1059 
1060   // -cl-std only applies for OpenCL language standards.
1061   // Override the -std option in this case.
1062   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1063     LangStandard::Kind OpenCLLangStd
1064     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1065     .Case("CL", LangStandard::lang_opencl)
1066     .Case("CL1.1", LangStandard::lang_opencl11)
1067     .Case("CL1.2", LangStandard::lang_opencl12)
1068     .Default(LangStandard::lang_unspecified);
1069 
1070     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1071       Diags.Report(diag::err_drv_invalid_value)
1072       << A->getAsString(Args) << A->getValue();
1073     }
1074     else
1075       LangStd = OpenCLLangStd;
1076   }
1077 
1078   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1079 
1080   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1081   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1082   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1083   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1084   // name, as it doesn't seem a useful distinction.
1085   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1086                                   Opts.GNUKeywords);
1087 
1088   if (Args.hasArg(OPT_fno_operator_names))
1089     Opts.CXXOperatorNames = 0;
1090 
1091   if (Opts.ObjC1) {
1092     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1093       StringRef value = arg->getValue();
1094       if (Opts.ObjCRuntime.tryParse(value))
1095         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1096     }
1097 
1098     if (Args.hasArg(OPT_fobjc_gc_only))
1099       Opts.setGC(LangOptions::GCOnly);
1100     else if (Args.hasArg(OPT_fobjc_gc))
1101       Opts.setGC(LangOptions::HybridGC);
1102     else if (Args.hasArg(OPT_fobjc_arc)) {
1103       Opts.ObjCAutoRefCount = 1;
1104       if (!Opts.ObjCRuntime.allowsARC())
1105         Diags.Report(diag::err_arc_unsupported_on_runtime);
1106 
1107       // Only set ObjCARCWeak if ARC is enabled.
1108       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1109         Opts.ObjCARCWeak = 1;
1110       else
1111         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1112     }
1113 
1114     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1115       Opts.ObjCInferRelatedResultType = 0;
1116   }
1117 
1118   if (Args.hasArg(OPT_fgnu89_inline))
1119     Opts.GNUInline = 1;
1120 
1121   if (Args.hasArg(OPT_fapple_kext)) {
1122     if (!Opts.CPlusPlus)
1123       Diags.Report(diag::warn_c_kext);
1124     else
1125       Opts.AppleKext = 1;
1126   }
1127 
1128   if (Args.hasArg(OPT_print_ivar_layout))
1129     Opts.ObjCGCBitmapPrint = 1;
1130   if (Args.hasArg(OPT_fno_constant_cfstrings))
1131     Opts.NoConstantCFStrings = 1;
1132 
1133   if (Args.hasArg(OPT_faltivec))
1134     Opts.AltiVec = 1;
1135 
1136   if (Args.hasArg(OPT_pthread))
1137     Opts.POSIXThreads = 1;
1138 
1139   if (Args.hasArg(OPT_fdelayed_template_parsing))
1140     Opts.DelayedTemplateParsing = 1;
1141 
1142   StringRef Vis = Args.getLastArgValue(OPT_fvisibility, "default");
1143   if (Vis == "default")
1144     Opts.setVisibilityMode(DefaultVisibility);
1145   else if (Vis == "hidden")
1146     Opts.setVisibilityMode(HiddenVisibility);
1147   else if (Vis == "protected")
1148     // FIXME: diagnose if target does not support protected visibility
1149     Opts.setVisibilityMode(ProtectedVisibility);
1150   else
1151     Diags.Report(diag::err_drv_invalid_value)
1152       << Args.getLastArg(OPT_fvisibility)->getAsString(Args) << Vis;
1153 
1154   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1155     Opts.InlineVisibilityHidden = 1;
1156 
1157   if (Args.hasArg(OPT_ftrapv)) {
1158     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1159     // Set the handler, if one is specified.
1160     Opts.OverflowHandler =
1161         Args.getLastArgValue(OPT_ftrapv_handler);
1162   }
1163   else if (Args.hasArg(OPT_fwrapv))
1164     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1165 
1166   if (Args.hasArg(OPT_trigraphs))
1167     Opts.Trigraphs = 1;
1168 
1169   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1170                                    OPT_fno_dollars_in_identifiers,
1171                                    Opts.DollarIdents);
1172   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1173   Opts.MicrosoftExt
1174     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1175   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1176   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1177   Opts.MSCVersion = Args.getLastArgIntValue(OPT_fmsc_version, 0, Diags);
1178   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1179   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1180   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1181                                    Opts.ConstStrings);
1182   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1183     Opts.LaxVectorConversions = 0;
1184   if (Args.hasArg(OPT_fno_threadsafe_statics))
1185     Opts.ThreadsafeStatics = 0;
1186   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1187   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1188   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1189   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1190   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1191 
1192   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1193   Opts.Blocks = Args.hasArg(OPT_fblocks);
1194   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1195   Opts.Modules = Args.hasArg(OPT_fmodules);
1196   Opts.CharIsSigned = !Args.hasArg(OPT_fno_signed_char);
1197   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1198   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1199   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1200   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1201   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1202   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1203   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1204   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1205   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1206   Opts.MathErrno = Args.hasArg(OPT_fmath_errno);
1207   Opts.InstantiationDepth = Args.getLastArgIntValue(OPT_ftemplate_depth, 512,
1208                                                     Diags);
1209   Opts.ConstexprCallDepth = Args.getLastArgIntValue(OPT_fconstexpr_depth, 512,
1210                                                     Diags);
1211   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1212   Opts.NumLargeByValueCopy = Args.getLastArgIntValue(OPT_Wlarge_by_value_copy_EQ,
1213                                                     0, Diags);
1214   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1215   Opts.ObjCConstantStringClass =
1216     Args.getLastArgValue(OPT_fconstant_string_class);
1217   Opts.ObjCDefaultSynthProperties =
1218     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1219   Opts.EncodeExtendedBlockSig =
1220     Args.hasArg(OPT_fencode_extended_block_signature);
1221   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1222   Opts.PackStruct = Args.getLastArgIntValue(OPT_fpack_struct_EQ, 0, Diags);
1223   Opts.PICLevel = Args.getLastArgIntValue(OPT_pic_level, 0, Diags);
1224   Opts.PIELevel = Args.getLastArgIntValue(OPT_pie_level, 0, Diags);
1225   Opts.Static = Args.hasArg(OPT_static_define);
1226   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1227   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1228                         || Args.hasArg(OPT_fdump_record_layouts);
1229   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1230   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1231   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1232   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1233   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1234   Opts.MRTD = Args.hasArg(OPT_mrtd);
1235   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1236   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1237   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1238   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1239   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1240   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1241   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1242   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1243 
1244   // Record whether the __DEPRECATED define was requested.
1245   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1246                                  OPT_fno_deprecated_macro,
1247                                  Opts.Deprecated);
1248 
1249   // FIXME: Eliminate this dependency.
1250   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1251        OptSize = getOptimizationLevelSize(Args, IK, Diags);
1252   Opts.Optimize = Opt != 0;
1253   Opts.OptimizeSize = OptSize != 0;
1254 
1255   // This is the __NO_INLINE__ define, which just depends on things like the
1256   // optimization level and -fno-inline, not actually whether the backend has
1257   // inlining enabled.
1258   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1259 
1260   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1261   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1262 
1263   Opts.EmitMicrosoftInlineAsm = Args.hasArg(OPT_fenable_experimental_ms_inline_asm);
1264 
1265   Opts.RetainCommentsFromSystemHeaders =
1266       Args.hasArg(OPT_fretain_comments_from_system_headers);
1267 
1268   unsigned SSP = Args.getLastArgIntValue(OPT_stack_protector, 0, Diags);
1269   switch (SSP) {
1270   default:
1271     Diags.Report(diag::err_drv_invalid_value)
1272       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1273     break;
1274   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1275   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1276   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1277   }
1278 
1279   // Parse -fsanitize= arguments.
1280   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1281   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1282     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1283     // efficiently map string values to them. Perform the mapping indirectly:
1284     // convert strings to enumerated values, then switch over the enum to set
1285     // the right bitfield value.
1286     enum Sanitizer {
1287 #define SANITIZER(NAME, ID) \
1288       ID,
1289 #include "clang/Basic/Sanitizers.def"
1290       Unknown
1291     };
1292     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1293 #define SANITIZER(NAME, ID) \
1294               .Case(NAME, ID)
1295 #include "clang/Basic/Sanitizers.def"
1296               .Default(Unknown)) {
1297 #define SANITIZER(NAME, ID) \
1298     case ID: \
1299       Opts.Sanitize##ID = true; \
1300       break;
1301 #include "clang/Basic/Sanitizers.def"
1302 
1303     case Unknown:
1304       Diags.Report(diag::err_drv_invalid_value)
1305         << "-fsanitize=" << Sanitizers[I];
1306       break;
1307     }
1308   }
1309 }
1310 
1311 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1312                                   FileManager &FileMgr,
1313                                   DiagnosticsEngine &Diags) {
1314   using namespace options;
1315   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1316   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1317   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1318       Opts.TokenCache = A->getValue();
1319   else
1320     Opts.TokenCache = Opts.ImplicitPTHInclude;
1321   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1322   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1323   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1324 
1325   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1326   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1327          ie = Args.filtered_end(); it != ie; ++it) {
1328     const Arg *A = *it;
1329     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1330   }
1331 
1332   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1333     StringRef Value(A->getValue());
1334     size_t Comma = Value.find(',');
1335     unsigned Bytes = 0;
1336     unsigned EndOfLine = 0;
1337 
1338     if (Comma == StringRef::npos ||
1339         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1340         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1341       Diags.Report(diag::err_drv_preamble_format);
1342     else {
1343       Opts.PrecompiledPreambleBytes.first = Bytes;
1344       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1345     }
1346   }
1347 
1348   // Add macros from the command line.
1349   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1350          ie = Args.filtered_end(); it != ie; ++it) {
1351     if ((*it)->getOption().matches(OPT_D))
1352       Opts.addMacroDef((*it)->getValue());
1353     else
1354       Opts.addMacroUndef((*it)->getValue());
1355   }
1356 
1357   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1358 
1359   // Add the ordered list of -includes.
1360   for (arg_iterator it = Args.filtered_begin(OPT_include, OPT_include_pch,
1361                                              OPT_include_pth),
1362          ie = Args.filtered_end(); it != ie; ++it) {
1363     const Arg *A = *it;
1364     Opts.Includes.push_back(A->getValue());
1365   }
1366 
1367   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1368          ie = Args.filtered_end(); it != ie; ++it) {
1369     const Arg *A = *it;
1370     Opts.ChainedIncludes.push_back(A->getValue());
1371   }
1372 
1373   // Include 'altivec.h' if -faltivec option present
1374   if (Args.hasArg(OPT_faltivec))
1375     Opts.Includes.push_back("altivec.h");
1376 
1377   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1378          ie = Args.filtered_end(); it != ie; ++it) {
1379     const Arg *A = *it;
1380     std::pair<StringRef,StringRef> Split =
1381       StringRef(A->getValue()).split(';');
1382 
1383     if (Split.second.empty()) {
1384       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1385       continue;
1386     }
1387 
1388     Opts.addRemappedFile(Split.first, Split.second);
1389   }
1390 
1391   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1392     StringRef Name = A->getValue();
1393     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1394       .Case("libc++", ARCXX_libcxx)
1395       .Case("libstdc++", ARCXX_libstdcxx)
1396       .Case("none", ARCXX_nolib)
1397       .Default(~0U);
1398     if (Library == ~0U)
1399       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1400     else
1401       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1402   }
1403 }
1404 
1405 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1406                                         ArgList &Args) {
1407   using namespace options;
1408   Opts.ShowCPP = !Args.hasArg(OPT_dM);
1409   Opts.ShowComments = Args.hasArg(OPT_C);
1410   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1411   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1412   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1413   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1414 }
1415 
1416 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1417   using namespace options;
1418   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1419   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1420   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1421   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1422   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1423   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1424 
1425   // Use the default target triple if unspecified.
1426   if (Opts.Triple.empty())
1427     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1428 }
1429 
1430 //
1431 
1432 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1433                                         const char *const *ArgBegin,
1434                                         const char *const *ArgEnd,
1435                                         DiagnosticsEngine &Diags) {
1436   bool Success = true;
1437 
1438   // Parse the arguments.
1439   OwningPtr<OptTable> Opts(createDriverOptTable());
1440   unsigned MissingArgIndex, MissingArgCount;
1441   OwningPtr<InputArgList> Args(
1442     Opts->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
1443 
1444   // Check for missing argument error.
1445   if (MissingArgCount) {
1446     Diags.Report(diag::err_drv_missing_argument)
1447       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1448     Success = false;
1449   }
1450 
1451   // Issue errors on unknown arguments.
1452   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1453          ie = Args->filtered_end(); it != ie; ++it) {
1454     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1455     Success = false;
1456   }
1457 
1458   // Issue errors on arguments that are not valid for CC1.
1459   for (ArgList::iterator I = Args->begin(), E = Args->end();
1460        I != E; ++I) {
1461     if (!(*I)->getOption().hasFlag(options::CC1Option)) {
1462       Diags.Report(diag::err_drv_unknown_argument) << (*I)->getAsString(*Args);
1463       Success = false;
1464     }
1465   }
1466 
1467   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1468   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1469   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1470   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1471             && Success;
1472   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1473   // FIXME: We shouldn't have to pass the DashX option around here
1474   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1475   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1476             && Success;
1477   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1478   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1479     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1480     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1481       Res.getLangOpts()->ObjCExceptions = 1;
1482   }
1483   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1484   // PCH file and find the original header name. Remove the need to do that in
1485   // ParsePreprocessorArgs and remove the FileManager
1486   // parameters from the function and the "FileManager.h" #include.
1487   FileManager FileMgr(Res.getFileSystemOpts());
1488   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1489   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args);
1490   ParseTargetArgs(Res.getTargetOpts(), *Args);
1491 
1492   return Success;
1493 }
1494 
1495 namespace {
1496 
1497   class ModuleSignature {
1498     SmallVector<uint64_t, 16> Data;
1499     unsigned CurBit;
1500     uint64_t CurValue;
1501 
1502   public:
1503     ModuleSignature() : CurBit(0), CurValue(0) { }
1504 
1505     void add(uint64_t Value, unsigned Bits);
1506     void add(StringRef Value);
1507     void flush();
1508 
1509     llvm::APInt getAsInteger() const;
1510   };
1511 }
1512 
1513 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1514   CurValue |= Value << CurBit;
1515   if (CurBit + NumBits < 64) {
1516     CurBit += NumBits;
1517     return;
1518   }
1519 
1520   // Add the current word.
1521   Data.push_back(CurValue);
1522 
1523   if (CurBit)
1524     CurValue = Value >> (64-CurBit);
1525   else
1526     CurValue = 0;
1527   CurBit = (CurBit+NumBits) & 63;
1528 }
1529 
1530 void ModuleSignature::flush() {
1531   if (CurBit == 0)
1532     return;
1533 
1534   Data.push_back(CurValue);
1535   CurBit = 0;
1536   CurValue = 0;
1537 }
1538 
1539 void ModuleSignature::add(StringRef Value) {
1540   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1541     add(*I, 8);
1542 }
1543 
1544 llvm::APInt ModuleSignature::getAsInteger() const {
1545   return llvm::APInt(Data.size() * 64, Data);
1546 }
1547 
1548 std::string CompilerInvocation::getModuleHash() const {
1549   using llvm::hash_code;
1550   using llvm::hash_value;
1551   using llvm::hash_combine;
1552 
1553   // Start the signature with the compiler version.
1554   // FIXME: We'd rather use something more cryptographically sound than
1555   // CityHash, but this will do for now.
1556   hash_code code = hash_value(getClangFullRepositoryVersion());
1557 
1558   // Extend the signature with the language options
1559 #define LANGOPT(Name, Bits, Default, Description) \
1560    code = hash_combine(code, LangOpts->Name);
1561 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1562   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1563 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1564 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1565 #include "clang/Basic/LangOptions.def"
1566 
1567   // Extend the signature with the target options.
1568   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1569                       TargetOpts->ABI, TargetOpts->CXXABI,
1570                       TargetOpts->LinkerVersion);
1571   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1572     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1573 
1574   // Extend the signature with preprocessor options.
1575   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1576   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1577 
1578   std::vector<StringRef> MacroDefs;
1579   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1580             I = getPreprocessorOpts().Macros.begin(),
1581          IEnd = getPreprocessorOpts().Macros.end();
1582        I != IEnd; ++I) {
1583     code = hash_combine(code, I->first, I->second);
1584   }
1585 
1586   // Extend the signature with the sysroot.
1587   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1588   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1589                       hsOpts.UseStandardSystemIncludes,
1590                       hsOpts.UseStandardCXXIncludes,
1591                       hsOpts.UseLibcxx);
1592 
1593   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1594 }
1595