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