xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision 2da64389698fcd6bc9dedd6ca47b8fb669d4e927) 
1 //===--- CompilerInvocation.cpp -------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "clang/Frontend/CompilerInvocation.h"
11 #include "clang/Basic/Diagnostic.h"
12 #include "clang/Basic/FileManager.h"
13 #include "clang/Basic/Version.h"
14 #include "clang/Driver/DriverDiagnostic.h"
15 #include "clang/Driver/Options.h"
16 #include "clang/Driver/Util.h"
17 #include "clang/Frontend/LangStandard.h"
18 #include "clang/Frontend/Utils.h"
19 #include "clang/Lex/HeaderSearchOptions.h"
20 #include "clang/Serialization/ASTReader.h"
21 #include "llvm/ADT/Hashing.h"
22 #include "llvm/ADT/OwningPtr.h"
23 #include "llvm/ADT/SmallVector.h"
24 #include "llvm/ADT/StringExtras.h"
25 #include "llvm/ADT/StringSwitch.h"
26 #include "llvm/ADT/Triple.h"
27 #include "llvm/Option/Arg.h"
28 #include "llvm/Option/ArgList.h"
29 #include "llvm/Option/OptTable.h"
30 #include "llvm/Option/Option.h"
31 #include "llvm/Support/ErrorHandling.h"
32 #include "llvm/Support/FileSystem.h"
33 #include "llvm/Support/Host.h"
34 #include "llvm/Support/Path.h"
35 #include "llvm/Support/system_error.h"
36 #include <sys/stat.h>
37 using namespace clang;
38 
39 //===----------------------------------------------------------------------===//
40 // Initialization.
41 //===----------------------------------------------------------------------===//
42 
43 CompilerInvocationBase::CompilerInvocationBase()
44   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
45     DiagnosticOpts(new DiagnosticOptions()),
46     HeaderSearchOpts(new HeaderSearchOptions()),
47     PreprocessorOpts(new PreprocessorOptions()) {}
48 
49 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
50   : RefCountedBase<CompilerInvocation>(),
51     LangOpts(new LangOptions(*X.getLangOpts())),
52     TargetOpts(new TargetOptions(X.getTargetOpts())),
53     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
54     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
55     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
56 
57 //===----------------------------------------------------------------------===//
58 // Deserialization (from args)
59 //===----------------------------------------------------------------------===//
60 
61 using namespace clang::driver;
62 using namespace clang::driver::options;
63 using namespace llvm::opt;
64 
65 //
66 
67 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
68                                      DiagnosticsEngine &Diags) {
69   unsigned DefaultOpt = 0;
70   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
71     DefaultOpt = 2;
72 
73   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
74     if (A->getOption().matches(options::OPT_O0))
75       return 0;
76 
77     if (A->getOption().matches(options::OPT_Ofast))
78       return 3;
79 
80     assert (A->getOption().matches(options::OPT_O));
81 
82     StringRef S(A->getValue());
83     if (S == "s" || S == "z" || S.empty())
84       return 2;
85 
86     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
87   }
88 
89   return DefaultOpt;
90 }
91 
92 static unsigned getOptimizationLevelSize(ArgList &Args) {
93   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
94     if (A->getOption().matches(options::OPT_O)) {
95       switch (A->getValue()[0]) {
96       default:
97         return 0;
98       case 's':
99         return 1;
100       case 'z':
101         return 2;
102       }
103     }
104   }
105   return 0;
106 }
107 
108 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
109   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
110          E = Args.filtered_end(); I != E; ++I) {
111     Arg *A = *I;
112     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
113     // to the warning list. Else, add its value (for the OPT_W case).
114     if (A->getOption().getKind() == Option::FlagClass) {
115       Warnings.push_back(A->getOption().getName().substr(1));
116     } else {
117       for (unsigned Idx = 0, End = A->getNumValues();
118            Idx < End; ++Idx) {
119         StringRef V = A->getValue(Idx);
120         // "-Wl," and such are not warning options.
121         // FIXME: Should be handled by putting these in separate flags.
122         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
123           continue;
124 
125         Warnings.push_back(V);
126       }
127     }
128   }
129 }
130 
131 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
132                               DiagnosticsEngine &Diags) {
133   using namespace options;
134   bool Success = true;
135   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
136     StringRef Name = A->getValue();
137     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
138 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
139       .Case(CMDFLAG, NAME##Model)
140 #include "clang/StaticAnalyzer/Core/Analyses.def"
141       .Default(NumStores);
142     if (Value == NumStores) {
143       Diags.Report(diag::err_drv_invalid_value)
144         << A->getAsString(Args) << Name;
145       Success = false;
146     } else {
147       Opts.AnalysisStoreOpt = Value;
148     }
149   }
150 
151   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
152     StringRef Name = A->getValue();
153     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
154 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
155       .Case(CMDFLAG, NAME##Model)
156 #include "clang/StaticAnalyzer/Core/Analyses.def"
157       .Default(NumConstraints);
158     if (Value == NumConstraints) {
159       Diags.Report(diag::err_drv_invalid_value)
160         << A->getAsString(Args) << Name;
161       Success = false;
162     } else {
163       Opts.AnalysisConstraintsOpt = Value;
164     }
165   }
166 
167   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
168     StringRef Name = A->getValue();
169     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
170 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
171       .Case(CMDFLAG, PD_##NAME)
172 #include "clang/StaticAnalyzer/Core/Analyses.def"
173       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
174     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
175       Diags.Report(diag::err_drv_invalid_value)
176         << A->getAsString(Args) << Name;
177       Success = false;
178     } else {
179       Opts.AnalysisDiagOpt = Value;
180     }
181   }
182 
183   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
184     StringRef Name = A->getValue();
185     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
186 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
187       .Case(CMDFLAG, NAME)
188 #include "clang/StaticAnalyzer/Core/Analyses.def"
189       .Default(NumPurgeModes);
190     if (Value == NumPurgeModes) {
191       Diags.Report(diag::err_drv_invalid_value)
192         << A->getAsString(Args) << Name;
193       Success = false;
194     } else {
195       Opts.AnalysisPurgeOpt = Value;
196     }
197   }
198 
199   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
200     StringRef Name = A->getValue();
201     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
202 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
203       .Case(CMDFLAG, NAME)
204 #include "clang/StaticAnalyzer/Core/Analyses.def"
205       .Default(NumInliningModes);
206     if (Value == NumInliningModes) {
207       Diags.Report(diag::err_drv_invalid_value)
208         << A->getAsString(Args) << Name;
209       Success = false;
210     } else {
211       Opts.InliningMode = Value;
212     }
213   }
214 
215   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
216   Opts.visualizeExplodedGraphWithGraphViz =
217     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
218   Opts.visualizeExplodedGraphWithUbiGraph =
219     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
220   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
221   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
222   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
223   Opts.AnalyzeNestedBlocks =
224     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
225   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
226   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
227   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
228   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
229   Opts.maxBlockVisitOnPath =
230       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
231   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
232   Opts.InlineMaxStackDepth =
233       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
234                          Opts.InlineMaxStackDepth, Diags);
235 
236   Opts.CheckersControlList.clear();
237   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
238                                              OPT_analyzer_disable_checker),
239          ie = Args.filtered_end(); it != ie; ++it) {
240     const Arg *A = *it;
241     A->claim();
242     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
243     // We can have a list of comma separated checker names, e.g:
244     // '-analyzer-checker=cocoa,unix'
245     StringRef checkerList = A->getValue();
246     SmallVector<StringRef, 4> checkers;
247     checkerList.split(checkers, ",");
248     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
249       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
250   }
251 
252   // Go through the analyzer configuration options.
253   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
254        ie = Args.filtered_end(); it != ie; ++it) {
255     const Arg *A = *it;
256     A->claim();
257     // We can have a list of comma separated config names, e.g:
258     // '-analyzer-config key1=val1,key2=val2'
259     StringRef configList = A->getValue();
260     SmallVector<StringRef, 4> configVals;
261     configList.split(configVals, ",");
262     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
263       StringRef key, val;
264       llvm::tie(key, val) = configVals[i].split("=");
265       if (val.empty()) {
266         Diags.Report(SourceLocation(),
267                      diag::err_analyzer_config_no_value) << configVals[i];
268         Success = false;
269         break;
270       }
271       if (val.find('=') != StringRef::npos) {
272         Diags.Report(SourceLocation(),
273                      diag::err_analyzer_config_multiple_values)
274           << configVals[i];
275         Success = false;
276         break;
277       }
278       Opts.Config[key] = val;
279     }
280   }
281 
282   return Success;
283 }
284 
285 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
286   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
287   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
288   return true;
289 }
290 
291 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
292   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
293   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
294 }
295 
296 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
297                              DiagnosticsEngine &Diags) {
298   using namespace options;
299   bool Success = true;
300 
301   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
302   if (OptLevel > 3) {
303     Diags.Report(diag::err_drv_invalid_value)
304       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
305     OptLevel = 3;
306     Success = false;
307   }
308   Opts.OptimizationLevel = OptLevel;
309 
310   // We must always run at least the always inlining pass.
311   Opts.setInlining(
312     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
313                                  : CodeGenOptions::OnlyAlwaysInlining);
314   // -fno-inline-functions overrides OptimizationLevel > 1.
315   Opts.NoInline = Args.hasArg(OPT_fno_inline);
316   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
317                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
318 
319   if (Args.hasArg(OPT_gline_tables_only)) {
320     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
321   } else if (Args.hasArg(OPT_g_Flag) || Args.hasArg(OPT_gdwarf_2) ||
322              Args.hasArg(OPT_gdwarf_3) || Args.hasArg(OPT_gdwarf_4)) {
323     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
324       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
325     else
326       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
327   }
328   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
329   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
330   if (Args.hasArg(OPT_gdwarf_2))
331     Opts.DwarfVersion = 2;
332   else if (Args.hasArg(OPT_gdwarf_3))
333     Opts.DwarfVersion = 3;
334   else if (Args.hasArg(OPT_gdwarf_4))
335     Opts.DwarfVersion = 4;
336   else if (Opts.getDebugInfo() != CodeGenOptions::NoDebugInfo)
337     // Default Dwarf version is 4 if we are generating debug information.
338     Opts.DwarfVersion = 4;
339 
340   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
341   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
342   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
343   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
344     OPT_fuse_register_sized_bitfield_access);
345   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
346   Opts.StructPathTBAA = Args.hasArg(OPT_struct_path_tbaa);
347   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
348   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
349   Opts.NoCommon = Args.hasArg(OPT_fno_common);
350   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
351   Opts.OptimizeSize = getOptimizationLevelSize(Args);
352   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
353                             Args.hasArg(OPT_ffreestanding));
354   Opts.UnrollLoops =
355       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
356                    (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize));
357 
358   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
359   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
360   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
361   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
362   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
363   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
364   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
365   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
366   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
367   Opts.DisableFree = Args.hasArg(OPT_disable_free);
368   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
369   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
370   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
371   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
372   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
373   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
374                        Args.hasArg(OPT_cl_finite_math_only)||
375                        Args.hasArg(OPT_cl_fast_relaxed_math));
376   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
377                        Args.hasArg(OPT_cl_finite_math_only)||
378                        Args.hasArg(OPT_cl_fast_relaxed_math));
379   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
380   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
381   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
382   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
383   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
384   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
385   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
386   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
387   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
388   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
389   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
390   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
391   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
392   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
393                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
394                       Args.hasArg(OPT_cl_fast_relaxed_math);
395   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
396   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
397   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
398   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
399 
400   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
401   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
402 
403   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
404   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
405   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
406 
407   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
408   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
409   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
410 
411   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
412   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
413   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
414   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
415   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
416     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
417     Opts.CoverageNoFunctionNamesInData =
418         Args.hasArg(OPT_coverage_no_function_names_in_data);
419     if (Args.hasArg(OPT_coverage_version_EQ)) {
420       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
421       if (CoverageVersion.size() != 4) {
422         Diags.Report(diag::err_drv_invalid_value)
423             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
424             << CoverageVersion;
425       } else {
426         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
427       }
428     }
429   }
430 
431   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
432   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
433   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
434   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
435   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
436   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
437   Opts.SanitizeMemoryTrackOrigins =
438     Args.hasArg(OPT_fsanitize_memory_track_origins);
439   Opts.SanitizeAddressZeroBaseShadow =
440     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
441   Opts.SanitizeUndefinedTrapOnError =
442     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
443   Opts.SSPBufferSize =
444       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
445   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
446   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
447     StringRef Val = A->getValue();
448     unsigned StackAlignment = Opts.StackAlignment;
449     Val.getAsInteger(10, StackAlignment);
450     Opts.StackAlignment = StackAlignment;
451   }
452 
453   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
454     StringRef Name = A->getValue();
455     unsigned Method = llvm::StringSwitch<unsigned>(Name)
456       .Case("legacy", CodeGenOptions::Legacy)
457       .Case("non-legacy", CodeGenOptions::NonLegacy)
458       .Case("mixed", CodeGenOptions::Mixed)
459       .Default(~0U);
460     if (Method == ~0U) {
461       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
462       Success = false;
463     } else {
464       Opts.setObjCDispatchMethod(
465         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
466     }
467   }
468 
469   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
470     StringRef Name = A->getValue();
471     unsigned Model = llvm::StringSwitch<unsigned>(Name)
472         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
473         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
474         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
475         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
476         .Default(~0U);
477     if (Model == ~0U) {
478       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
479       Success = false;
480     } else {
481       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
482     }
483   }
484 
485   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
486     StringRef Val = A->getValue();
487     if (Val == "fast")
488       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
489     else if (Val == "on")
490       Opts.setFPContractMode(CodeGenOptions::FPC_On);
491     else if (Val == "off")
492       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
493     else
494       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
495   }
496 
497   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
498     if (A->getOption().matches(OPT_fpcc_struct_return)) {
499       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
500     } else {
501       assert(A->getOption().matches(OPT_freg_struct_return));
502       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
503     }
504   }
505 
506   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
507 
508   return Success;
509 }
510 
511 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
512                                       ArgList &Args) {
513   using namespace options;
514   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
515   Opts.Targets = Args.getAllArgValues(OPT_MT);
516   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
517   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
518   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
519   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
520   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
521   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
522   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
523 }
524 
525 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
526                                 DiagnosticsEngine *Diags) {
527   using namespace options;
528   bool Success = true;
529 
530   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
531   Opts.DiagnosticSerializationFile =
532     Args.getLastArgValue(OPT_diagnostic_serialized_file);
533   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
534   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
535   Opts.Pedantic = Args.hasArg(OPT_pedantic);
536   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
537   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
538   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
539   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
540                                  OPT_fno_show_column,
541                                  /*Default=*/true);
542   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
543   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
544   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
545 
546   // Default behavior is to not to show note include stacks.
547   Opts.ShowNoteIncludeStack = false;
548   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
549                                OPT_fno_diagnostics_show_note_include_stack))
550     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
551       Opts.ShowNoteIncludeStack = true;
552 
553   StringRef ShowOverloads =
554     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
555   if (ShowOverloads == "best")
556     Opts.setShowOverloads(Ovl_Best);
557   else if (ShowOverloads == "all")
558     Opts.setShowOverloads(Ovl_All);
559   else {
560     Success = false;
561     if (Diags)
562       Diags->Report(diag::err_drv_invalid_value)
563       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
564       << ShowOverloads;
565   }
566 
567   StringRef ShowCategory =
568     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
569   if (ShowCategory == "none")
570     Opts.ShowCategories = 0;
571   else if (ShowCategory == "id")
572     Opts.ShowCategories = 1;
573   else if (ShowCategory == "name")
574     Opts.ShowCategories = 2;
575   else {
576     Success = false;
577     if (Diags)
578       Diags->Report(diag::err_drv_invalid_value)
579       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
580       << ShowCategory;
581   }
582 
583   StringRef Format =
584     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
585   if (Format == "clang")
586     Opts.setFormat(DiagnosticOptions::Clang);
587   else if (Format == "msvc")
588     Opts.setFormat(DiagnosticOptions::Msvc);
589   else if (Format == "vi")
590     Opts.setFormat(DiagnosticOptions::Vi);
591   else {
592     Success = false;
593     if (Diags)
594       Diags->Report(diag::err_drv_invalid_value)
595       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
596       << Format;
597   }
598 
599   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
600   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
601   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
602   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
603   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
604   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
605   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
606   Opts.MacroBacktraceLimit =
607       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
608                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
609   Opts.TemplateBacktraceLimit = getLastArgIntValue(
610       Args, OPT_ftemplate_backtrace_limit,
611       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
612   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
613       Args, OPT_fconstexpr_backtrace_limit,
614       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
615   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
616                                     DiagnosticOptions::DefaultTabStop, Diags);
617   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
618     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
619     if (Diags)
620       Diags->Report(diag::warn_ignoring_ftabstop_value)
621       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
622   }
623   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
624   addWarningArgs(Args, Opts.Warnings);
625 
626   return Success;
627 }
628 
629 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
630   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
631 }
632 
633 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
634                                    DiagnosticsEngine &Diags) {
635   using namespace options;
636   Opts.ProgramAction = frontend::ParseSyntaxOnly;
637   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
638     switch (A->getOption().getID()) {
639     default:
640       llvm_unreachable("Invalid option in group!");
641     case OPT_ast_list:
642       Opts.ProgramAction = frontend::ASTDeclList; break;
643     case OPT_ast_dump:
644       Opts.ProgramAction = frontend::ASTDump; break;
645     case OPT_ast_dump_xml:
646       Opts.ProgramAction = frontend::ASTDumpXML; break;
647     case OPT_ast_print:
648       Opts.ProgramAction = frontend::ASTPrint; break;
649     case OPT_ast_view:
650       Opts.ProgramAction = frontend::ASTView; break;
651     case OPT_dump_raw_tokens:
652       Opts.ProgramAction = frontend::DumpRawTokens; break;
653     case OPT_dump_tokens:
654       Opts.ProgramAction = frontend::DumpTokens; break;
655     case OPT_S:
656       Opts.ProgramAction = frontend::EmitAssembly; break;
657     case OPT_emit_llvm_bc:
658       Opts.ProgramAction = frontend::EmitBC; break;
659     case OPT_emit_html:
660       Opts.ProgramAction = frontend::EmitHTML; break;
661     case OPT_emit_llvm:
662       Opts.ProgramAction = frontend::EmitLLVM; break;
663     case OPT_emit_llvm_only:
664       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
665     case OPT_emit_codegen_only:
666       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
667     case OPT_emit_obj:
668       Opts.ProgramAction = frontend::EmitObj; break;
669     case OPT_fixit_EQ:
670       Opts.FixItSuffix = A->getValue();
671       // fall-through!
672     case OPT_fixit:
673       Opts.ProgramAction = frontend::FixIt; break;
674     case OPT_emit_module:
675       Opts.ProgramAction = frontend::GenerateModule; break;
676     case OPT_emit_pch:
677       Opts.ProgramAction = frontend::GeneratePCH; break;
678     case OPT_emit_pth:
679       Opts.ProgramAction = frontend::GeneratePTH; break;
680     case OPT_init_only:
681       Opts.ProgramAction = frontend::InitOnly; break;
682     case OPT_fsyntax_only:
683       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
684     case OPT_module_file_info:
685       Opts.ProgramAction = frontend::ModuleFileInfo; break;
686     case OPT_print_decl_contexts:
687       Opts.ProgramAction = frontend::PrintDeclContext; break;
688     case OPT_print_preamble:
689       Opts.ProgramAction = frontend::PrintPreamble; break;
690     case OPT_E:
691       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
692     case OPT_rewrite_macros:
693       Opts.ProgramAction = frontend::RewriteMacros; break;
694     case OPT_rewrite_objc:
695       Opts.ProgramAction = frontend::RewriteObjC; break;
696     case OPT_rewrite_test:
697       Opts.ProgramAction = frontend::RewriteTest; break;
698     case OPT_analyze:
699       Opts.ProgramAction = frontend::RunAnalysis; break;
700     case OPT_migrate:
701       Opts.ProgramAction = frontend::MigrateSource; break;
702     case OPT_Eonly:
703       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
704     }
705   }
706 
707   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
708     Opts.Plugins.push_back(A->getValue(0));
709     Opts.ProgramAction = frontend::PluginAction;
710     Opts.ActionName = A->getValue();
711 
712     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
713            end = Args.filtered_end(); it != end; ++it) {
714       if ((*it)->getValue(0) == Opts.ActionName)
715         Opts.PluginArgs.push_back((*it)->getValue(1));
716     }
717   }
718 
719   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
720   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
721   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
722     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
723            end = Args.filtered_end(); it != end; ++it) {
724       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
725         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
726     }
727   }
728 
729   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
730     Opts.CodeCompletionAt =
731       ParsedSourceLocation::FromString(A->getValue());
732     if (Opts.CodeCompletionAt.FileName.empty())
733       Diags.Report(diag::err_drv_invalid_value)
734         << A->getAsString(Args) << A->getValue();
735   }
736   Opts.DisableFree = Args.hasArg(OPT_disable_free);
737 
738   Opts.OutputFile = Args.getLastArgValue(OPT_o);
739   Opts.Plugins = Args.getAllArgValues(OPT_load);
740   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
741   Opts.ShowHelp = Args.hasArg(OPT_help);
742   Opts.ShowStats = Args.hasArg(OPT_print_stats);
743   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
744   Opts.ShowVersion = Args.hasArg(OPT_version);
745   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
746   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
747   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
748   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
749   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
750   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
751   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
752   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
753   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
754   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
755 
756   Opts.CodeCompleteOpts.IncludeMacros
757     = Args.hasArg(OPT_code_completion_macros);
758   Opts.CodeCompleteOpts.IncludeCodePatterns
759     = Args.hasArg(OPT_code_completion_patterns);
760   Opts.CodeCompleteOpts.IncludeGlobals
761     = !Args.hasArg(OPT_no_code_completion_globals);
762   Opts.CodeCompleteOpts.IncludeBriefComments
763     = Args.hasArg(OPT_code_completion_brief_comments);
764 
765   Opts.OverrideRecordLayoutsFile
766     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
767   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
768                                      OPT_arcmt_modify,
769                                      OPT_arcmt_migrate)) {
770     switch (A->getOption().getID()) {
771     default:
772       llvm_unreachable("missed a case");
773     case OPT_arcmt_check:
774       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
775       break;
776     case OPT_arcmt_modify:
777       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
778       break;
779     case OPT_arcmt_migrate:
780       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
781       break;
782     }
783   }
784   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
785   Opts.ARCMTMigrateReportOut
786     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
787   Opts.ARCMTMigrateEmitARCErrors
788     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
789 
790   if (Args.hasArg(OPT_objcmt_migrate_literals))
791     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
792   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
793     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
794   if (Args.hasArg(OPT_objcmt_migrate_property))
795     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
796   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
797     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
798 
799   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
800       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
801     Diags.Report(diag::err_drv_argument_not_allowed_with)
802       << "ARC migration" << "ObjC migration";
803   }
804 
805   InputKind DashX = IK_None;
806   if (const Arg *A = Args.getLastArg(OPT_x)) {
807     DashX = llvm::StringSwitch<InputKind>(A->getValue())
808       .Case("c", IK_C)
809       .Case("cl", IK_OpenCL)
810       .Case("cuda", IK_CUDA)
811       .Case("c++", IK_CXX)
812       .Case("objective-c", IK_ObjC)
813       .Case("objective-c++", IK_ObjCXX)
814       .Case("cpp-output", IK_PreprocessedC)
815       .Case("assembler-with-cpp", IK_Asm)
816       .Case("c++-cpp-output", IK_PreprocessedCXX)
817       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
818       .Case("objc-cpp-output", IK_PreprocessedObjC)
819       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
820       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
821       .Case("c-header", IK_C)
822       .Case("cl-header", IK_OpenCL)
823       .Case("objective-c-header", IK_ObjC)
824       .Case("c++-header", IK_CXX)
825       .Case("objective-c++-header", IK_ObjCXX)
826       .Cases("ast", "pcm", IK_AST)
827       .Case("ir", IK_LLVM_IR)
828       .Default(IK_None);
829     if (DashX == IK_None)
830       Diags.Report(diag::err_drv_invalid_value)
831         << A->getAsString(Args) << A->getValue();
832   }
833 
834   // '-' is the default input if none is given.
835   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
836   Opts.Inputs.clear();
837   if (Inputs.empty())
838     Inputs.push_back("-");
839   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
840     InputKind IK = DashX;
841     if (IK == IK_None) {
842       IK = FrontendOptions::getInputKindForExtension(
843         StringRef(Inputs[i]).rsplit('.').second);
844       // FIXME: Remove this hack.
845       if (i == 0)
846         DashX = IK;
847     }
848     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
849   }
850 
851   return DashX;
852 }
853 
854 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
855                                                  void *MainAddr) {
856   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
857 
858   if (!P.empty()) {
859     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
860     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
861 
862     // Get foo/lib/clang/<version>/include
863     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
864   }
865 
866   return P.str();
867 }
868 
869 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
870   using namespace options;
871   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
872   Opts.Verbose = Args.hasArg(OPT_v);
873   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
874   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
875   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
876   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
877     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
878   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
879   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
880   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
881   // -fmodules implies -fmodule-maps
882   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
883   Opts.ModuleCachePruneInterval =
884       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
885   Opts.ModuleCachePruneAfter =
886       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
887   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
888                     ie = Args.filtered_end();
889        it != ie; ++it) {
890     StringRef MacroDef = (*it)->getValue();
891     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
892   }
893 
894   // Add -I..., -F..., and -index-header-map options in order.
895   bool IsIndexHeaderMap = false;
896   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
897                                              OPT_index_header_map),
898        ie = Args.filtered_end(); it != ie; ++it) {
899     if ((*it)->getOption().matches(OPT_index_header_map)) {
900       // -index-header-map applies to the next -I or -F.
901       IsIndexHeaderMap = true;
902       continue;
903     }
904 
905     frontend::IncludeDirGroup Group
906       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
907 
908     Opts.AddPath((*it)->getValue(), Group,
909                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
910     IsIndexHeaderMap = false;
911   }
912 
913   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
914   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
915   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
916                                              OPT_iwithprefixbefore),
917          ie = Args.filtered_end(); it != ie; ++it) {
918     const Arg *A = *it;
919     if (A->getOption().matches(OPT_iprefix))
920       Prefix = A->getValue();
921     else if (A->getOption().matches(OPT_iwithprefix))
922       Opts.AddPath(Prefix.str() + A->getValue(),
923                    frontend::After, false, true);
924     else
925       Opts.AddPath(Prefix.str() + A->getValue(),
926                    frontend::Angled, false, true);
927   }
928 
929   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
930          ie = Args.filtered_end(); it != ie; ++it)
931     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
932   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
933          ie = Args.filtered_end(); it != ie; ++it)
934     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
935   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
936          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
937     Opts.AddPath((*it)->getValue(), frontend::System, false,
938                  !(*it)->getOption().matches(OPT_iwithsysroot));
939   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
940          ie = Args.filtered_end(); it != ie; ++it)
941     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
942 
943   // Add the paths for the various language specific isystem flags.
944   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
945        ie = Args.filtered_end(); it != ie; ++it)
946     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
947   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
948        ie = Args.filtered_end(); it != ie; ++it)
949     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
950   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
951        ie = Args.filtered_end(); it != ie; ++it)
952     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
953   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
954        ie = Args.filtered_end(); it != ie; ++it)
955     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
956 
957   // Add the internal paths from a driver that detects standard include paths.
958   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
959                                             OPT_internal_externc_isystem),
960                     E = Args.filtered_end();
961        I != E; ++I) {
962     frontend::IncludeDirGroup Group = frontend::System;
963     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
964       Group = frontend::ExternCSystem;
965     Opts.AddPath((*I)->getValue(), Group, false, true);
966   }
967 
968   // Add the path prefixes which are implicitly treated as being system headers.
969   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
970                                             OPT_ino_system_prefix),
971                     E = Args.filtered_end();
972        I != E; ++I)
973     Opts.AddSystemHeaderPrefix((*I)->getValue(),
974                                (*I)->getOption().matches(OPT_isystem_prefix));
975 }
976 
977 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
978                                          LangStandard::Kind LangStd) {
979   // Set some properties which depend solely on the input kind; it would be nice
980   // to move these to the language standard, and have the driver resolve the
981   // input kind + language standard.
982   if (IK == IK_Asm) {
983     Opts.AsmPreprocessor = 1;
984   } else if (IK == IK_ObjC ||
985              IK == IK_ObjCXX ||
986              IK == IK_PreprocessedObjC ||
987              IK == IK_PreprocessedObjCXX) {
988     Opts.ObjC1 = Opts.ObjC2 = 1;
989   }
990 
991   if (LangStd == LangStandard::lang_unspecified) {
992     // Based on the base language, pick one.
993     switch (IK) {
994     case IK_None:
995     case IK_AST:
996     case IK_LLVM_IR:
997       llvm_unreachable("Invalid input kind!");
998     case IK_OpenCL:
999       LangStd = LangStandard::lang_opencl;
1000       break;
1001     case IK_CUDA:
1002       LangStd = LangStandard::lang_cuda;
1003       break;
1004     case IK_Asm:
1005     case IK_C:
1006     case IK_PreprocessedC:
1007     case IK_ObjC:
1008     case IK_PreprocessedObjC:
1009       LangStd = LangStandard::lang_gnu99;
1010       break;
1011     case IK_CXX:
1012     case IK_PreprocessedCXX:
1013     case IK_ObjCXX:
1014     case IK_PreprocessedObjCXX:
1015       LangStd = LangStandard::lang_gnucxx98;
1016       break;
1017     }
1018   }
1019 
1020   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1021   Opts.LineComment = Std.hasLineComments();
1022   Opts.C99 = Std.isC99();
1023   Opts.C11 = Std.isC11();
1024   Opts.CPlusPlus = Std.isCPlusPlus();
1025   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1026   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1027   Opts.Digraphs = Std.hasDigraphs();
1028   Opts.GNUMode = Std.isGNUMode();
1029   Opts.GNUInline = !Std.isC99();
1030   Opts.HexFloats = Std.hasHexFloats();
1031   Opts.ImplicitInt = Std.hasImplicitInt();
1032 
1033   // Set OpenCL Version.
1034   if (LangStd == LangStandard::lang_opencl) {
1035     Opts.OpenCL = 1;
1036     Opts.OpenCLVersion = 100;
1037   }
1038   else if (LangStd == LangStandard::lang_opencl11) {
1039       Opts.OpenCL = 1;
1040       Opts.OpenCLVersion = 110;
1041   }
1042   else if (LangStd == LangStandard::lang_opencl12) {
1043     Opts.OpenCL = 1;
1044     Opts.OpenCLVersion = 120;
1045   }
1046 
1047   // OpenCL has some additional defaults.
1048   if (Opts.OpenCL) {
1049     Opts.AltiVec = 0;
1050     Opts.CXXOperatorNames = 1;
1051     Opts.LaxVectorConversions = 0;
1052     Opts.DefaultFPContract = 1;
1053     Opts.NativeHalfType = 1;
1054   }
1055 
1056   if (LangStd == LangStandard::lang_cuda)
1057     Opts.CUDA = 1;
1058 
1059   // OpenCL and C++ both have bool, true, false keywords.
1060   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1061 
1062   // C++ has wchar_t keyword.
1063   Opts.WChar = Opts.CPlusPlus;
1064 
1065   Opts.GNUKeywords = Opts.GNUMode;
1066   Opts.CXXOperatorNames = Opts.CPlusPlus;
1067 
1068   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1069   // is specified, or -std is set to a conforming mode.
1070   Opts.Trigraphs = !Opts.GNUMode;
1071 
1072   Opts.DollarIdents = !Opts.AsmPreprocessor;
1073 }
1074 
1075 /// Attempt to parse a visibility value out of the given argument.
1076 static Visibility parseVisibility(Arg *arg, ArgList &args,
1077                                   DiagnosticsEngine &diags) {
1078   StringRef value = arg->getValue();
1079   if (value == "default") {
1080     return DefaultVisibility;
1081   } else if (value == "hidden") {
1082     return HiddenVisibility;
1083   } else if (value == "protected") {
1084     // FIXME: diagnose if target does not support protected visibility
1085     return ProtectedVisibility;
1086   }
1087 
1088   diags.Report(diag::err_drv_invalid_value)
1089     << arg->getAsString(args) << value;
1090   return DefaultVisibility;
1091 }
1092 
1093 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1094                           DiagnosticsEngine &Diags) {
1095   // FIXME: Cleanup per-file based stuff.
1096   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1097   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1098     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1099 #define LANGSTANDARD(id, name, desc, features) \
1100       .Case(name, LangStandard::lang_##id)
1101 #include "clang/Frontend/LangStandards.def"
1102       .Default(LangStandard::lang_unspecified);
1103     if (LangStd == LangStandard::lang_unspecified)
1104       Diags.Report(diag::err_drv_invalid_value)
1105         << A->getAsString(Args) << A->getValue();
1106     else {
1107       // Valid standard, check to make sure language and standard are compatable.
1108       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1109       switch (IK) {
1110       case IK_C:
1111       case IK_ObjC:
1112       case IK_PreprocessedC:
1113       case IK_PreprocessedObjC:
1114         if (!(Std.isC89() || Std.isC99()))
1115           Diags.Report(diag::err_drv_argument_not_allowed_with)
1116             << A->getAsString(Args) << "C/ObjC";
1117         break;
1118       case IK_CXX:
1119       case IK_ObjCXX:
1120       case IK_PreprocessedCXX:
1121       case IK_PreprocessedObjCXX:
1122         if (!Std.isCPlusPlus())
1123           Diags.Report(diag::err_drv_argument_not_allowed_with)
1124             << A->getAsString(Args) << "C++/ObjC++";
1125         break;
1126       case IK_OpenCL:
1127         if (!Std.isC99())
1128           Diags.Report(diag::err_drv_argument_not_allowed_with)
1129             << A->getAsString(Args) << "OpenCL";
1130         break;
1131       case IK_CUDA:
1132         if (!Std.isCPlusPlus())
1133           Diags.Report(diag::err_drv_argument_not_allowed_with)
1134             << A->getAsString(Args) << "CUDA";
1135         break;
1136       default:
1137         break;
1138       }
1139     }
1140   }
1141 
1142   // -cl-std only applies for OpenCL language standards.
1143   // Override the -std option in this case.
1144   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1145     LangStandard::Kind OpenCLLangStd
1146     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1147     .Case("CL", LangStandard::lang_opencl)
1148     .Case("CL1.1", LangStandard::lang_opencl11)
1149     .Case("CL1.2", LangStandard::lang_opencl12)
1150     .Default(LangStandard::lang_unspecified);
1151 
1152     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1153       Diags.Report(diag::err_drv_invalid_value)
1154       << A->getAsString(Args) << A->getValue();
1155     }
1156     else
1157       LangStd = OpenCLLangStd;
1158   }
1159 
1160   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1161 
1162   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1163   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1164   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1165   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1166   // name, as it doesn't seem a useful distinction.
1167   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1168                                   Opts.GNUKeywords);
1169 
1170   if (Args.hasArg(OPT_fno_operator_names))
1171     Opts.CXXOperatorNames = 0;
1172 
1173   if (Opts.ObjC1) {
1174     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1175       StringRef value = arg->getValue();
1176       if (Opts.ObjCRuntime.tryParse(value))
1177         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1178     }
1179 
1180     if (Args.hasArg(OPT_fobjc_gc_only))
1181       Opts.setGC(LangOptions::GCOnly);
1182     else if (Args.hasArg(OPT_fobjc_gc))
1183       Opts.setGC(LangOptions::HybridGC);
1184     else if (Args.hasArg(OPT_fobjc_arc)) {
1185       Opts.ObjCAutoRefCount = 1;
1186       if (!Opts.ObjCRuntime.allowsARC())
1187         Diags.Report(diag::err_arc_unsupported_on_runtime);
1188 
1189       // Only set ObjCARCWeak if ARC is enabled.
1190       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1191         Opts.ObjCARCWeak = 1;
1192       else
1193         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1194     }
1195 
1196     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1197       Opts.ObjCInferRelatedResultType = 0;
1198   }
1199 
1200   if (Args.hasArg(OPT_fgnu89_inline))
1201     Opts.GNUInline = 1;
1202 
1203   if (Args.hasArg(OPT_fapple_kext)) {
1204     if (!Opts.CPlusPlus)
1205       Diags.Report(diag::warn_c_kext);
1206     else
1207       Opts.AppleKext = 1;
1208   }
1209 
1210   if (Args.hasArg(OPT_print_ivar_layout))
1211     Opts.ObjCGCBitmapPrint = 1;
1212   if (Args.hasArg(OPT_fno_constant_cfstrings))
1213     Opts.NoConstantCFStrings = 1;
1214 
1215   if (Args.hasArg(OPT_faltivec))
1216     Opts.AltiVec = 1;
1217 
1218   if (Args.hasArg(OPT_pthread))
1219     Opts.POSIXThreads = 1;
1220 
1221   // The value-visibility mode defaults to "default".
1222   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1223     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1224   } else {
1225     Opts.setValueVisibilityMode(DefaultVisibility);
1226   }
1227 
1228   // The type-visibility mode defaults to the value-visibility mode.
1229   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1230     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1231   } else {
1232     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1233   }
1234 
1235   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1236     Opts.InlineVisibilityHidden = 1;
1237 
1238   if (Args.hasArg(OPT_ftrapv)) {
1239     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1240     // Set the handler, if one is specified.
1241     Opts.OverflowHandler =
1242         Args.getLastArgValue(OPT_ftrapv_handler);
1243   }
1244   else if (Args.hasArg(OPT_fwrapv))
1245     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1246 
1247   if (Args.hasArg(OPT_trigraphs))
1248     Opts.Trigraphs = 1;
1249 
1250   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1251                                    OPT_fno_dollars_in_identifiers,
1252                                    Opts.DollarIdents);
1253   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1254   Opts.MicrosoftExt
1255     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1256   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1257   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1258   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1259   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1260   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1261   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1262                                    Opts.ConstStrings);
1263   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1264     Opts.LaxVectorConversions = 0;
1265   if (Args.hasArg(OPT_fno_threadsafe_statics))
1266     Opts.ThreadsafeStatics = 0;
1267   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1268   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1269   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1270   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1271   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1272 
1273   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1274   Opts.Blocks = Args.hasArg(OPT_fblocks);
1275   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1276   Opts.Modules = Args.hasArg(OPT_fmodules);
1277   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1278   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1279   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1280   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1281   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1282   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1283   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1284   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1285   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1286   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1287   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1288   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1289   Opts.InstantiationDepth =
1290       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1291   Opts.ConstexprCallDepth =
1292       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1293   Opts.ConstexprStepLimit =
1294       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1295   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1296   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1297   Opts.NumLargeByValueCopy =
1298       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1299   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1300   Opts.ObjCConstantStringClass =
1301     Args.getLastArgValue(OPT_fconstant_string_class);
1302   Opts.ObjCDefaultSynthProperties =
1303     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1304   Opts.EncodeExtendedBlockSig =
1305     Args.hasArg(OPT_fencode_extended_block_signature);
1306   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1307   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1308   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1309   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1310   Opts.Static = Args.hasArg(OPT_static_define);
1311   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1312   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1313                         || Args.hasArg(OPT_fdump_record_layouts);
1314   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1315   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1316   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1317   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1318   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1319   Opts.MRTD = Args.hasArg(OPT_mrtd);
1320   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1321   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1322   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1323   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1324   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1325   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1326   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1327   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1328 
1329   // Check if -fopenmp is specified.
1330   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1331 
1332   // Record whether the __DEPRECATED define was requested.
1333   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1334                                  OPT_fno_deprecated_macro,
1335                                  Opts.Deprecated);
1336 
1337   // FIXME: Eliminate this dependency.
1338   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1339        OptSize = getOptimizationLevelSize(Args);
1340   Opts.Optimize = Opt != 0;
1341   Opts.OptimizeSize = OptSize != 0;
1342 
1343   // This is the __NO_INLINE__ define, which just depends on things like the
1344   // optimization level and -fno-inline, not actually whether the backend has
1345   // inlining enabled.
1346   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1347 
1348   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1349   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1350 
1351   Opts.RetainCommentsFromSystemHeaders =
1352       Args.hasArg(OPT_fretain_comments_from_system_headers);
1353 
1354   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1355   switch (SSP) {
1356   default:
1357     Diags.Report(diag::err_drv_invalid_value)
1358       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1359     break;
1360   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1361   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1362   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1363   }
1364 
1365   // Parse -fsanitize= arguments.
1366   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1367   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1368     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1369     // efficiently map string values to them. Perform the mapping indirectly:
1370     // convert strings to enumerated values, then switch over the enum to set
1371     // the right bitfield value.
1372     enum Sanitizer {
1373 #define SANITIZER(NAME, ID) \
1374       ID,
1375 #include "clang/Basic/Sanitizers.def"
1376       Unknown
1377     };
1378     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1379 #define SANITIZER(NAME, ID) \
1380               .Case(NAME, ID)
1381 #include "clang/Basic/Sanitizers.def"
1382               .Default(Unknown)) {
1383 #define SANITIZER(NAME, ID) \
1384     case ID: \
1385       Opts.Sanitize.ID = true; \
1386       break;
1387 #include "clang/Basic/Sanitizers.def"
1388 
1389     case Unknown:
1390       Diags.Report(diag::err_drv_invalid_value)
1391         << "-fsanitize=" << Sanitizers[I];
1392       break;
1393     }
1394   }
1395 }
1396 
1397 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1398                                   FileManager &FileMgr,
1399                                   DiagnosticsEngine &Diags) {
1400   using namespace options;
1401   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1402   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1403   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1404       Opts.TokenCache = A->getValue();
1405   else
1406     Opts.TokenCache = Opts.ImplicitPTHInclude;
1407   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1408   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1409   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1410 
1411   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1412   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1413          ie = Args.filtered_end(); it != ie; ++it) {
1414     const Arg *A = *it;
1415     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1416   }
1417 
1418   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1419     StringRef Value(A->getValue());
1420     size_t Comma = Value.find(',');
1421     unsigned Bytes = 0;
1422     unsigned EndOfLine = 0;
1423 
1424     if (Comma == StringRef::npos ||
1425         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1426         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1427       Diags.Report(diag::err_drv_preamble_format);
1428     else {
1429       Opts.PrecompiledPreambleBytes.first = Bytes;
1430       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1431     }
1432   }
1433 
1434   // Add macros from the command line.
1435   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1436          ie = Args.filtered_end(); it != ie; ++it) {
1437     if ((*it)->getOption().matches(OPT_D))
1438       Opts.addMacroDef((*it)->getValue());
1439     else
1440       Opts.addMacroUndef((*it)->getValue());
1441   }
1442 
1443   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1444 
1445   // Add the ordered list of -includes.
1446   for (arg_iterator it = Args.filtered_begin(OPT_include),
1447          ie = Args.filtered_end(); it != ie; ++it) {
1448     const Arg *A = *it;
1449     Opts.Includes.push_back(A->getValue());
1450   }
1451 
1452   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1453          ie = Args.filtered_end(); it != ie; ++it) {
1454     const Arg *A = *it;
1455     Opts.ChainedIncludes.push_back(A->getValue());
1456   }
1457 
1458   // Include 'altivec.h' if -faltivec option present
1459   if (Args.hasArg(OPT_faltivec))
1460     Opts.Includes.push_back("altivec.h");
1461 
1462   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1463          ie = Args.filtered_end(); it != ie; ++it) {
1464     const Arg *A = *it;
1465     std::pair<StringRef,StringRef> Split =
1466       StringRef(A->getValue()).split(';');
1467 
1468     if (Split.second.empty()) {
1469       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1470       continue;
1471     }
1472 
1473     Opts.addRemappedFile(Split.first, Split.second);
1474   }
1475 
1476   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1477     StringRef Name = A->getValue();
1478     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1479       .Case("libc++", ARCXX_libcxx)
1480       .Case("libstdc++", ARCXX_libstdcxx)
1481       .Case("none", ARCXX_nolib)
1482       .Default(~0U);
1483     if (Library == ~0U)
1484       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1485     else
1486       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1487   }
1488 }
1489 
1490 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1491                                         ArgList &Args,
1492                                         frontend::ActionKind Action) {
1493   using namespace options;
1494 
1495   switch (Action) {
1496   case frontend::ASTDeclList:
1497   case frontend::ASTDump:
1498   case frontend::ASTDumpXML:
1499   case frontend::ASTPrint:
1500   case frontend::ASTView:
1501   case frontend::EmitAssembly:
1502   case frontend::EmitBC:
1503   case frontend::EmitHTML:
1504   case frontend::EmitLLVM:
1505   case frontend::EmitLLVMOnly:
1506   case frontend::EmitCodeGenOnly:
1507   case frontend::EmitObj:
1508   case frontend::FixIt:
1509   case frontend::GenerateModule:
1510   case frontend::GeneratePCH:
1511   case frontend::GeneratePTH:
1512   case frontend::ParseSyntaxOnly:
1513   case frontend::ModuleFileInfo:
1514   case frontend::PluginAction:
1515   case frontend::PrintDeclContext:
1516   case frontend::RewriteObjC:
1517   case frontend::RewriteTest:
1518   case frontend::RunAnalysis:
1519   case frontend::MigrateSource:
1520     Opts.ShowCPP = 0;
1521     break;
1522 
1523   case frontend::DumpRawTokens:
1524   case frontend::DumpTokens:
1525   case frontend::InitOnly:
1526   case frontend::PrintPreamble:
1527   case frontend::PrintPreprocessedInput:
1528   case frontend::RewriteMacros:
1529   case frontend::RunPreprocessorOnly:
1530     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1531     break;
1532   }
1533 
1534   Opts.ShowComments = Args.hasArg(OPT_C);
1535   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1536   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1537   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1538   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1539 }
1540 
1541 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1542   using namespace options;
1543   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1544   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1545   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1546   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1547   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1548   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1549   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1550 
1551   // Use the default target triple if unspecified.
1552   if (Opts.Triple.empty())
1553     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1554 }
1555 
1556 //
1557 
1558 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1559                                         const char *const *ArgBegin,
1560                                         const char *const *ArgEnd,
1561                                         DiagnosticsEngine &Diags) {
1562   bool Success = true;
1563 
1564   // Parse the arguments.
1565   OwningPtr<OptTable> Opts(createDriverOptTable());
1566   const unsigned IncludedFlagsBitmask = options::CC1Option;
1567   unsigned MissingArgIndex, MissingArgCount;
1568   OwningPtr<InputArgList> Args(
1569     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1570                     IncludedFlagsBitmask));
1571 
1572   // Check for missing argument error.
1573   if (MissingArgCount) {
1574     Diags.Report(diag::err_drv_missing_argument)
1575       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1576     Success = false;
1577   }
1578 
1579   // Issue errors on unknown arguments.
1580   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1581          ie = Args->filtered_end(); it != ie; ++it) {
1582     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1583     Success = false;
1584   }
1585 
1586   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1587   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1588   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1589   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1590             && Success;
1591   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1592   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1593   // FIXME: We shouldn't have to pass the DashX option around here
1594   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1595   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1596             && Success;
1597   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1598   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1599     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1600     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1601       Res.getLangOpts()->ObjCExceptions = 1;
1602   }
1603   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1604   // PCH file and find the original header name. Remove the need to do that in
1605   // ParsePreprocessorArgs and remove the FileManager
1606   // parameters from the function and the "FileManager.h" #include.
1607   FileManager FileMgr(Res.getFileSystemOpts());
1608   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1609   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1610                               Res.getFrontendOpts().ProgramAction);
1611   ParseTargetArgs(Res.getTargetOpts(), *Args);
1612 
1613   return Success;
1614 }
1615 
1616 namespace {
1617 
1618   class ModuleSignature {
1619     SmallVector<uint64_t, 16> Data;
1620     unsigned CurBit;
1621     uint64_t CurValue;
1622 
1623   public:
1624     ModuleSignature() : CurBit(0), CurValue(0) { }
1625 
1626     void add(uint64_t Value, unsigned Bits);
1627     void add(StringRef Value);
1628     void flush();
1629 
1630     llvm::APInt getAsInteger() const;
1631   };
1632 }
1633 
1634 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1635   CurValue |= Value << CurBit;
1636   if (CurBit + NumBits < 64) {
1637     CurBit += NumBits;
1638     return;
1639   }
1640 
1641   // Add the current word.
1642   Data.push_back(CurValue);
1643 
1644   if (CurBit)
1645     CurValue = Value >> (64-CurBit);
1646   else
1647     CurValue = 0;
1648   CurBit = (CurBit+NumBits) & 63;
1649 }
1650 
1651 void ModuleSignature::flush() {
1652   if (CurBit == 0)
1653     return;
1654 
1655   Data.push_back(CurValue);
1656   CurBit = 0;
1657   CurValue = 0;
1658 }
1659 
1660 void ModuleSignature::add(StringRef Value) {
1661   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1662     add(*I, 8);
1663 }
1664 
1665 llvm::APInt ModuleSignature::getAsInteger() const {
1666   return llvm::APInt(Data.size() * 64, Data);
1667 }
1668 
1669 std::string CompilerInvocation::getModuleHash() const {
1670   // Note: For QoI reasons, the things we use as a hash here should all be
1671   // dumped via the -module-info flag.
1672   using llvm::hash_code;
1673   using llvm::hash_value;
1674   using llvm::hash_combine;
1675 
1676   // Start the signature with the compiler version.
1677   // FIXME: We'd rather use something more cryptographically sound than
1678   // CityHash, but this will do for now.
1679   hash_code code = hash_value(getClangFullRepositoryVersion());
1680 
1681   // Extend the signature with the language options
1682 #define LANGOPT(Name, Bits, Default, Description) \
1683    code = hash_combine(code, LangOpts->Name);
1684 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1685   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1686 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1687 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1688 #include "clang/Basic/LangOptions.def"
1689 
1690   // Extend the signature with the target options.
1691   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1692                       TargetOpts->ABI, TargetOpts->CXXABI,
1693                       TargetOpts->LinkerVersion);
1694   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1695     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1696 
1697   // Extend the signature with preprocessor options.
1698   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1699   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1700   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1701 
1702   std::vector<StringRef> MacroDefs;
1703   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1704             I = getPreprocessorOpts().Macros.begin(),
1705          IEnd = getPreprocessorOpts().Macros.end();
1706        I != IEnd; ++I) {
1707     // If we're supposed to ignore this macro for the purposes of modules,
1708     // don't put it into the hash.
1709     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1710       // Check whether we're ignoring this macro.
1711       StringRef MacroDef = I->first;
1712       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1713         continue;
1714     }
1715 
1716     code = hash_combine(code, I->first, I->second);
1717   }
1718 
1719   // Extend the signature with the sysroot.
1720   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1721                       hsOpts.UseStandardSystemIncludes,
1722                       hsOpts.UseStandardCXXIncludes,
1723                       hsOpts.UseLibcxx);
1724 
1725   // Darwin-specific hack: if we have a sysroot, use the contents and
1726   // modification time of
1727   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1728   // as part of the module hash.
1729   if (!hsOpts.Sysroot.empty()) {
1730     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1731     SmallString<128> systemVersionFile;
1732     systemVersionFile += hsOpts.Sysroot;
1733     llvm::sys::path::append(systemVersionFile, "System");
1734     llvm::sys::path::append(systemVersionFile, "Library");
1735     llvm::sys::path::append(systemVersionFile, "CoreServices");
1736     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1737     if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
1738       code = hash_combine(code, buffer.get()->getBuffer());
1739 
1740       struct stat statBuf;
1741       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1742         code = hash_combine(code, statBuf.st_mtime);
1743     }
1744   }
1745 
1746   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1747 }
1748 
1749 namespace clang {
1750 
1751 // Declared in clang/Frontend/Utils.h.
1752 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1753                        DiagnosticsEngine *Diags) {
1754   int Res = Default;
1755   if (Arg *A = Args.getLastArg(Id)) {
1756     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1757       if (Diags)
1758         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1759                                                        << A->getValue();
1760     }
1761   }
1762   return Res;
1763 }
1764 }
1765