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, AUTOCREAT) \
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 3 if we are generating debug information.
338     Opts.DwarfVersion = 3;
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 = Args.hasArg(OPT_funroll_loops) ||
355                      (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize);
356 
357   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
358   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
359   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
360   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
361   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
362   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
363   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
364   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
365   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
366   Opts.DisableFree = Args.hasArg(OPT_disable_free);
367   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
368   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
369   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
370   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
371   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
372   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
373                        Args.hasArg(OPT_cl_finite_math_only)||
374                        Args.hasArg(OPT_cl_fast_relaxed_math));
375   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
376                        Args.hasArg(OPT_cl_finite_math_only)||
377                        Args.hasArg(OPT_cl_fast_relaxed_math));
378   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
379   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
380   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
381   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
382   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
383   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
384   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
385   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
386   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
387   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
388   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
389   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
390   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
391   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
392                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
393                       Args.hasArg(OPT_cl_fast_relaxed_math);
394   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
395   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
396   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
397   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
398 
399   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
400   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
401 
402   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
403   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
404   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
405 
406   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
407   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
408   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
409 
410   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
411   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
412   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
413   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
414   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
415     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
416     Opts.CoverageNoFunctionNamesInData =
417         Args.hasArg(OPT_coverage_no_function_names_in_data);
418     if (Args.hasArg(OPT_coverage_version_EQ)) {
419       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
420       if (CoverageVersion.size() != 4) {
421         Diags.Report(diag::err_drv_invalid_value)
422             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
423             << CoverageVersion;
424       } else {
425         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
426       }
427     }
428   }
429 
430   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
431   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
432   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
433   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
434   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
435   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
436   Opts.SanitizeMemoryTrackOrigins =
437     Args.hasArg(OPT_fsanitize_memory_track_origins);
438   Opts.SanitizeAddressZeroBaseShadow =
439     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
440   Opts.SanitizeUndefinedTrapOnError =
441     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
442   Opts.SSPBufferSize =
443       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
444   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
445   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
446     StringRef Val = A->getValue();
447     unsigned StackAlignment = Opts.StackAlignment;
448     Val.getAsInteger(10, StackAlignment);
449     Opts.StackAlignment = StackAlignment;
450   }
451 
452   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
453     StringRef Name = A->getValue();
454     unsigned Method = llvm::StringSwitch<unsigned>(Name)
455       .Case("legacy", CodeGenOptions::Legacy)
456       .Case("non-legacy", CodeGenOptions::NonLegacy)
457       .Case("mixed", CodeGenOptions::Mixed)
458       .Default(~0U);
459     if (Method == ~0U) {
460       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
461       Success = false;
462     } else {
463       Opts.setObjCDispatchMethod(
464         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
465     }
466   }
467 
468   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
469     StringRef Name = A->getValue();
470     unsigned Model = llvm::StringSwitch<unsigned>(Name)
471         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
472         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
473         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
474         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
475         .Default(~0U);
476     if (Model == ~0U) {
477       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
478       Success = false;
479     } else {
480       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
481     }
482   }
483 
484   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
485     StringRef Val = A->getValue();
486     if (Val == "fast")
487       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
488     else if (Val == "on")
489       Opts.setFPContractMode(CodeGenOptions::FPC_On);
490     else if (Val == "off")
491       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
492     else
493       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
494   }
495 
496   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
497     if (A->getOption().matches(OPT_fpcc_struct_return)) {
498       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
499     } else {
500       assert(A->getOption().matches(OPT_freg_struct_return));
501       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
502     }
503   }
504 
505   return Success;
506 }
507 
508 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
509                                       ArgList &Args) {
510   using namespace options;
511   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
512   Opts.Targets = Args.getAllArgValues(OPT_MT);
513   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
514   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
515   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
516   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
517   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
518   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
519 }
520 
521 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
522                                 DiagnosticsEngine *Diags) {
523   using namespace options;
524   bool Success = true;
525 
526   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
527   Opts.DiagnosticSerializationFile =
528     Args.getLastArgValue(OPT_diagnostic_serialized_file);
529   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
530   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
531   Opts.Pedantic = Args.hasArg(OPT_pedantic);
532   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
533   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
534   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
535   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
536                                  OPT_fno_show_column,
537                                  /*Default=*/true);
538   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
539   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
540   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
541 
542   // Default behavior is to not to show note include stacks.
543   Opts.ShowNoteIncludeStack = false;
544   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
545                                OPT_fno_diagnostics_show_note_include_stack))
546     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
547       Opts.ShowNoteIncludeStack = true;
548 
549   StringRef ShowOverloads =
550     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
551   if (ShowOverloads == "best")
552     Opts.setShowOverloads(Ovl_Best);
553   else if (ShowOverloads == "all")
554     Opts.setShowOverloads(Ovl_All);
555   else {
556     Success = false;
557     if (Diags)
558       Diags->Report(diag::err_drv_invalid_value)
559       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
560       << ShowOverloads;
561   }
562 
563   StringRef ShowCategory =
564     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
565   if (ShowCategory == "none")
566     Opts.ShowCategories = 0;
567   else if (ShowCategory == "id")
568     Opts.ShowCategories = 1;
569   else if (ShowCategory == "name")
570     Opts.ShowCategories = 2;
571   else {
572     Success = false;
573     if (Diags)
574       Diags->Report(diag::err_drv_invalid_value)
575       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
576       << ShowCategory;
577   }
578 
579   StringRef Format =
580     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
581   if (Format == "clang")
582     Opts.setFormat(DiagnosticOptions::Clang);
583   else if (Format == "msvc")
584     Opts.setFormat(DiagnosticOptions::Msvc);
585   else if (Format == "vi")
586     Opts.setFormat(DiagnosticOptions::Vi);
587   else {
588     Success = false;
589     if (Diags)
590       Diags->Report(diag::err_drv_invalid_value)
591       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
592       << Format;
593   }
594 
595   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
596   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
597   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
598   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
599   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
600   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
601   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
602   Opts.MacroBacktraceLimit =
603       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
604                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
605   Opts.TemplateBacktraceLimit = getLastArgIntValue(
606       Args, OPT_ftemplate_backtrace_limit,
607       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
608   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
609       Args, OPT_fconstexpr_backtrace_limit,
610       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
611   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
612                                     DiagnosticOptions::DefaultTabStop, Diags);
613   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
614     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
615     if (Diags)
616       Diags->Report(diag::warn_ignoring_ftabstop_value)
617       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
618   }
619   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
620   addWarningArgs(Args, Opts.Warnings);
621 
622   return Success;
623 }
624 
625 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
626   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
627 }
628 
629 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
630                                    DiagnosticsEngine &Diags) {
631   using namespace options;
632   Opts.ProgramAction = frontend::ParseSyntaxOnly;
633   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
634     switch (A->getOption().getID()) {
635     default:
636       llvm_unreachable("Invalid option in group!");
637     case OPT_ast_list:
638       Opts.ProgramAction = frontend::ASTDeclList; break;
639     case OPT_ast_dump:
640       Opts.ProgramAction = frontend::ASTDump; break;
641     case OPT_ast_dump_xml:
642       Opts.ProgramAction = frontend::ASTDumpXML; break;
643     case OPT_ast_print:
644       Opts.ProgramAction = frontend::ASTPrint; break;
645     case OPT_ast_view:
646       Opts.ProgramAction = frontend::ASTView; break;
647     case OPT_dump_raw_tokens:
648       Opts.ProgramAction = frontend::DumpRawTokens; break;
649     case OPT_dump_tokens:
650       Opts.ProgramAction = frontend::DumpTokens; break;
651     case OPT_S:
652       Opts.ProgramAction = frontend::EmitAssembly; break;
653     case OPT_emit_llvm_bc:
654       Opts.ProgramAction = frontend::EmitBC; break;
655     case OPT_emit_html:
656       Opts.ProgramAction = frontend::EmitHTML; break;
657     case OPT_emit_llvm:
658       Opts.ProgramAction = frontend::EmitLLVM; break;
659     case OPT_emit_llvm_only:
660       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
661     case OPT_emit_codegen_only:
662       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
663     case OPT_emit_obj:
664       Opts.ProgramAction = frontend::EmitObj; break;
665     case OPT_fixit_EQ:
666       Opts.FixItSuffix = A->getValue();
667       // fall-through!
668     case OPT_fixit:
669       Opts.ProgramAction = frontend::FixIt; break;
670     case OPT_emit_module:
671       Opts.ProgramAction = frontend::GenerateModule; break;
672     case OPT_emit_pch:
673       Opts.ProgramAction = frontend::GeneratePCH; break;
674     case OPT_emit_pth:
675       Opts.ProgramAction = frontend::GeneratePTH; break;
676     case OPT_init_only:
677       Opts.ProgramAction = frontend::InitOnly; break;
678     case OPT_fsyntax_only:
679       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
680     case OPT_module_file_info:
681       Opts.ProgramAction = frontend::ModuleFileInfo; break;
682     case OPT_print_decl_contexts:
683       Opts.ProgramAction = frontend::PrintDeclContext; break;
684     case OPT_print_preamble:
685       Opts.ProgramAction = frontend::PrintPreamble; break;
686     case OPT_E:
687       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
688     case OPT_rewrite_macros:
689       Opts.ProgramAction = frontend::RewriteMacros; break;
690     case OPT_rewrite_objc:
691       Opts.ProgramAction = frontend::RewriteObjC; break;
692     case OPT_rewrite_test:
693       Opts.ProgramAction = frontend::RewriteTest; break;
694     case OPT_analyze:
695       Opts.ProgramAction = frontend::RunAnalysis; break;
696     case OPT_migrate:
697       Opts.ProgramAction = frontend::MigrateSource; break;
698     case OPT_Eonly:
699       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
700     }
701   }
702 
703   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
704     Opts.Plugins.push_back(A->getValue(0));
705     Opts.ProgramAction = frontend::PluginAction;
706     Opts.ActionName = A->getValue();
707 
708     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
709            end = Args.filtered_end(); it != end; ++it) {
710       if ((*it)->getValue(0) == Opts.ActionName)
711         Opts.PluginArgs.push_back((*it)->getValue(1));
712     }
713   }
714 
715   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
716   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
717   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
718     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
719            end = Args.filtered_end(); it != end; ++it) {
720       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
721         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
722     }
723   }
724 
725   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
726     Opts.CodeCompletionAt =
727       ParsedSourceLocation::FromString(A->getValue());
728     if (Opts.CodeCompletionAt.FileName.empty())
729       Diags.Report(diag::err_drv_invalid_value)
730         << A->getAsString(Args) << A->getValue();
731   }
732   Opts.DisableFree = Args.hasArg(OPT_disable_free);
733 
734   Opts.OutputFile = Args.getLastArgValue(OPT_o);
735   Opts.Plugins = Args.getAllArgValues(OPT_load);
736   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
737   Opts.ShowHelp = Args.hasArg(OPT_help);
738   Opts.ShowStats = Args.hasArg(OPT_print_stats);
739   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
740   Opts.ShowVersion = Args.hasArg(OPT_version);
741   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
742   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
743   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
744   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
745   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
746   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
747   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
748   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
749   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
750   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
751 
752   Opts.CodeCompleteOpts.IncludeMacros
753     = Args.hasArg(OPT_code_completion_macros);
754   Opts.CodeCompleteOpts.IncludeCodePatterns
755     = Args.hasArg(OPT_code_completion_patterns);
756   Opts.CodeCompleteOpts.IncludeGlobals
757     = !Args.hasArg(OPT_no_code_completion_globals);
758   Opts.CodeCompleteOpts.IncludeBriefComments
759     = Args.hasArg(OPT_code_completion_brief_comments);
760 
761   Opts.OverrideRecordLayoutsFile
762     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
763   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
764                                      OPT_arcmt_modify,
765                                      OPT_arcmt_migrate)) {
766     switch (A->getOption().getID()) {
767     default:
768       llvm_unreachable("missed a case");
769     case OPT_arcmt_check:
770       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
771       break;
772     case OPT_arcmt_modify:
773       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
774       break;
775     case OPT_arcmt_migrate:
776       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
777       break;
778     }
779   }
780   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
781   Opts.ARCMTMigrateReportOut
782     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
783   Opts.ARCMTMigrateEmitARCErrors
784     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
785 
786   if (Args.hasArg(OPT_objcmt_migrate_literals))
787     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
788   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
789     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
790 
791   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
792       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
793     Diags.Report(diag::err_drv_argument_not_allowed_with)
794       << "ARC migration" << "ObjC migration";
795   }
796 
797   InputKind DashX = IK_None;
798   if (const Arg *A = Args.getLastArg(OPT_x)) {
799     DashX = llvm::StringSwitch<InputKind>(A->getValue())
800       .Case("c", IK_C)
801       .Case("cl", IK_OpenCL)
802       .Case("cuda", IK_CUDA)
803       .Case("c++", IK_CXX)
804       .Case("objective-c", IK_ObjC)
805       .Case("objective-c++", IK_ObjCXX)
806       .Case("cpp-output", IK_PreprocessedC)
807       .Case("assembler-with-cpp", IK_Asm)
808       .Case("c++-cpp-output", IK_PreprocessedCXX)
809       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
810       .Case("objc-cpp-output", IK_PreprocessedObjC)
811       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
812       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
813       .Case("c-header", IK_C)
814       .Case("cl-header", IK_OpenCL)
815       .Case("objective-c-header", IK_ObjC)
816       .Case("c++-header", IK_CXX)
817       .Case("objective-c++-header", IK_ObjCXX)
818       .Cases("ast", "pcm", IK_AST)
819       .Case("ir", IK_LLVM_IR)
820       .Default(IK_None);
821     if (DashX == IK_None)
822       Diags.Report(diag::err_drv_invalid_value)
823         << A->getAsString(Args) << A->getValue();
824   }
825 
826   // '-' is the default input if none is given.
827   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
828   Opts.Inputs.clear();
829   if (Inputs.empty())
830     Inputs.push_back("-");
831   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
832     InputKind IK = DashX;
833     if (IK == IK_None) {
834       IK = FrontendOptions::getInputKindForExtension(
835         StringRef(Inputs[i]).rsplit('.').second);
836       // FIXME: Remove this hack.
837       if (i == 0)
838         DashX = IK;
839     }
840     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
841   }
842 
843   return DashX;
844 }
845 
846 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
847                                                  void *MainAddr) {
848   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
849 
850   if (!P.empty()) {
851     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
852     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
853 
854     // Get foo/lib/clang/<version>/include
855     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
856   }
857 
858   return P.str();
859 }
860 
861 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
862   using namespace options;
863   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
864   Opts.Verbose = Args.hasArg(OPT_v);
865   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
866   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
867   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
868   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
869     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
870   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
871   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
872   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
873   Opts.ModuleCachePruneInterval =
874       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
875   Opts.ModuleCachePruneAfter =
876       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
877   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
878                     ie = Args.filtered_end();
879        it != ie; ++it) {
880     StringRef MacroDef = (*it)->getValue();
881     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
882   }
883 
884   // Add -I..., -F..., and -index-header-map options in order.
885   bool IsIndexHeaderMap = false;
886   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
887                                              OPT_index_header_map),
888        ie = Args.filtered_end(); it != ie; ++it) {
889     if ((*it)->getOption().matches(OPT_index_header_map)) {
890       // -index-header-map applies to the next -I or -F.
891       IsIndexHeaderMap = true;
892       continue;
893     }
894 
895     frontend::IncludeDirGroup Group
896       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
897 
898     Opts.AddPath((*it)->getValue(), Group,
899                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
900     IsIndexHeaderMap = false;
901   }
902 
903   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
904   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
905   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
906                                              OPT_iwithprefixbefore),
907          ie = Args.filtered_end(); it != ie; ++it) {
908     const Arg *A = *it;
909     if (A->getOption().matches(OPT_iprefix))
910       Prefix = A->getValue();
911     else if (A->getOption().matches(OPT_iwithprefix))
912       Opts.AddPath(Prefix.str() + A->getValue(),
913                    frontend::After, false, true);
914     else
915       Opts.AddPath(Prefix.str() + A->getValue(),
916                    frontend::Angled, false, true);
917   }
918 
919   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
920          ie = Args.filtered_end(); it != ie; ++it)
921     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
922   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
923          ie = Args.filtered_end(); it != ie; ++it)
924     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
925   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
926          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
927     Opts.AddPath((*it)->getValue(), frontend::System, false,
928                  !(*it)->getOption().matches(OPT_iwithsysroot));
929   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
930          ie = Args.filtered_end(); it != ie; ++it)
931     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
932 
933   // Add the paths for the various language specific isystem flags.
934   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
935        ie = Args.filtered_end(); it != ie; ++it)
936     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
937   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
938        ie = Args.filtered_end(); it != ie; ++it)
939     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
940   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
941        ie = Args.filtered_end(); it != ie; ++it)
942     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
943   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
944        ie = Args.filtered_end(); it != ie; ++it)
945     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
946 
947   // Add the internal paths from a driver that detects standard include paths.
948   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
949                                             OPT_internal_externc_isystem),
950                     E = Args.filtered_end();
951        I != E; ++I) {
952     frontend::IncludeDirGroup Group = frontend::System;
953     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
954       Group = frontend::ExternCSystem;
955     Opts.AddPath((*I)->getValue(), Group, false, true);
956   }
957 
958   // Add the path prefixes which are implicitly treated as being system headers.
959   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
960                                             OPT_ino_system_prefix),
961                     E = Args.filtered_end();
962        I != E; ++I)
963     Opts.AddSystemHeaderPrefix((*I)->getValue(),
964                                (*I)->getOption().matches(OPT_isystem_prefix));
965 }
966 
967 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
968                                          LangStandard::Kind LangStd) {
969   // Set some properties which depend solely on the input kind; it would be nice
970   // to move these to the language standard, and have the driver resolve the
971   // input kind + language standard.
972   if (IK == IK_Asm) {
973     Opts.AsmPreprocessor = 1;
974   } else if (IK == IK_ObjC ||
975              IK == IK_ObjCXX ||
976              IK == IK_PreprocessedObjC ||
977              IK == IK_PreprocessedObjCXX) {
978     Opts.ObjC1 = Opts.ObjC2 = 1;
979   }
980 
981   if (LangStd == LangStandard::lang_unspecified) {
982     // Based on the base language, pick one.
983     switch (IK) {
984     case IK_None:
985     case IK_AST:
986     case IK_LLVM_IR:
987       llvm_unreachable("Invalid input kind!");
988     case IK_OpenCL:
989       LangStd = LangStandard::lang_opencl;
990       break;
991     case IK_CUDA:
992       LangStd = LangStandard::lang_cuda;
993       break;
994     case IK_Asm:
995     case IK_C:
996     case IK_PreprocessedC:
997     case IK_ObjC:
998     case IK_PreprocessedObjC:
999       LangStd = LangStandard::lang_gnu99;
1000       break;
1001     case IK_CXX:
1002     case IK_PreprocessedCXX:
1003     case IK_ObjCXX:
1004     case IK_PreprocessedObjCXX:
1005       LangStd = LangStandard::lang_gnucxx98;
1006       break;
1007     }
1008   }
1009 
1010   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1011   Opts.LineComment = Std.hasLineComments();
1012   Opts.C99 = Std.isC99();
1013   Opts.C11 = Std.isC11();
1014   Opts.CPlusPlus = Std.isCPlusPlus();
1015   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1016   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1017   Opts.Digraphs = Std.hasDigraphs();
1018   Opts.GNUMode = Std.isGNUMode();
1019   Opts.GNUInline = !Std.isC99();
1020   Opts.HexFloats = Std.hasHexFloats();
1021   Opts.ImplicitInt = Std.hasImplicitInt();
1022 
1023   // Set OpenCL Version.
1024   if (LangStd == LangStandard::lang_opencl) {
1025     Opts.OpenCL = 1;
1026     Opts.OpenCLVersion = 100;
1027   }
1028   else if (LangStd == LangStandard::lang_opencl11) {
1029       Opts.OpenCL = 1;
1030       Opts.OpenCLVersion = 110;
1031   }
1032   else if (LangStd == LangStandard::lang_opencl12) {
1033     Opts.OpenCL = 1;
1034     Opts.OpenCLVersion = 120;
1035   }
1036 
1037   // OpenCL has some additional defaults.
1038   if (Opts.OpenCL) {
1039     Opts.AltiVec = 0;
1040     Opts.CXXOperatorNames = 1;
1041     Opts.LaxVectorConversions = 0;
1042     Opts.DefaultFPContract = 1;
1043     Opts.NativeHalfType = 1;
1044   }
1045 
1046   if (LangStd == LangStandard::lang_cuda)
1047     Opts.CUDA = 1;
1048 
1049   // OpenCL and C++ both have bool, true, false keywords.
1050   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1051 
1052   // C++ has wchar_t keyword.
1053   Opts.WChar = Opts.CPlusPlus;
1054 
1055   Opts.GNUKeywords = Opts.GNUMode;
1056   Opts.CXXOperatorNames = Opts.CPlusPlus;
1057 
1058   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1059   // is specified, or -std is set to a conforming mode.
1060   Opts.Trigraphs = !Opts.GNUMode;
1061 
1062   Opts.DollarIdents = !Opts.AsmPreprocessor;
1063 }
1064 
1065 /// Attempt to parse a visibility value out of the given argument.
1066 static Visibility parseVisibility(Arg *arg, ArgList &args,
1067                                   DiagnosticsEngine &diags) {
1068   StringRef value = arg->getValue();
1069   if (value == "default") {
1070     return DefaultVisibility;
1071   } else if (value == "hidden") {
1072     return HiddenVisibility;
1073   } else if (value == "protected") {
1074     // FIXME: diagnose if target does not support protected visibility
1075     return ProtectedVisibility;
1076   }
1077 
1078   diags.Report(diag::err_drv_invalid_value)
1079     << arg->getAsString(args) << value;
1080   return DefaultVisibility;
1081 }
1082 
1083 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1084                           DiagnosticsEngine &Diags) {
1085   // FIXME: Cleanup per-file based stuff.
1086   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1087   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1088     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1089 #define LANGSTANDARD(id, name, desc, features) \
1090       .Case(name, LangStandard::lang_##id)
1091 #include "clang/Frontend/LangStandards.def"
1092       .Default(LangStandard::lang_unspecified);
1093     if (LangStd == LangStandard::lang_unspecified)
1094       Diags.Report(diag::err_drv_invalid_value)
1095         << A->getAsString(Args) << A->getValue();
1096     else {
1097       // Valid standard, check to make sure language and standard are compatable.
1098       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1099       switch (IK) {
1100       case IK_C:
1101       case IK_ObjC:
1102       case IK_PreprocessedC:
1103       case IK_PreprocessedObjC:
1104         if (!(Std.isC89() || Std.isC99()))
1105           Diags.Report(diag::err_drv_argument_not_allowed_with)
1106             << A->getAsString(Args) << "C/ObjC";
1107         break;
1108       case IK_CXX:
1109       case IK_ObjCXX:
1110       case IK_PreprocessedCXX:
1111       case IK_PreprocessedObjCXX:
1112         if (!Std.isCPlusPlus())
1113           Diags.Report(diag::err_drv_argument_not_allowed_with)
1114             << A->getAsString(Args) << "C++/ObjC++";
1115         break;
1116       case IK_OpenCL:
1117         if (!Std.isC99())
1118           Diags.Report(diag::err_drv_argument_not_allowed_with)
1119             << A->getAsString(Args) << "OpenCL";
1120         break;
1121       case IK_CUDA:
1122         if (!Std.isCPlusPlus())
1123           Diags.Report(diag::err_drv_argument_not_allowed_with)
1124             << A->getAsString(Args) << "CUDA";
1125         break;
1126       default:
1127         break;
1128       }
1129     }
1130   }
1131 
1132   // -cl-std only applies for OpenCL language standards.
1133   // Override the -std option in this case.
1134   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1135     LangStandard::Kind OpenCLLangStd
1136     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1137     .Case("CL", LangStandard::lang_opencl)
1138     .Case("CL1.1", LangStandard::lang_opencl11)
1139     .Case("CL1.2", LangStandard::lang_opencl12)
1140     .Default(LangStandard::lang_unspecified);
1141 
1142     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1143       Diags.Report(diag::err_drv_invalid_value)
1144       << A->getAsString(Args) << A->getValue();
1145     }
1146     else
1147       LangStd = OpenCLLangStd;
1148   }
1149 
1150   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1151 
1152   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1153   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1154   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1155   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1156   // name, as it doesn't seem a useful distinction.
1157   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1158                                   Opts.GNUKeywords);
1159 
1160   if (Args.hasArg(OPT_fno_operator_names))
1161     Opts.CXXOperatorNames = 0;
1162 
1163   if (Opts.ObjC1) {
1164     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1165       StringRef value = arg->getValue();
1166       if (Opts.ObjCRuntime.tryParse(value))
1167         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1168     }
1169 
1170     if (Args.hasArg(OPT_fobjc_gc_only))
1171       Opts.setGC(LangOptions::GCOnly);
1172     else if (Args.hasArg(OPT_fobjc_gc))
1173       Opts.setGC(LangOptions::HybridGC);
1174     else if (Args.hasArg(OPT_fobjc_arc)) {
1175       Opts.ObjCAutoRefCount = 1;
1176       if (!Opts.ObjCRuntime.allowsARC())
1177         Diags.Report(diag::err_arc_unsupported_on_runtime);
1178 
1179       // Only set ObjCARCWeak if ARC is enabled.
1180       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1181         Opts.ObjCARCWeak = 1;
1182       else
1183         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1184     }
1185 
1186     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1187       Opts.ObjCInferRelatedResultType = 0;
1188   }
1189 
1190   if (Args.hasArg(OPT_fgnu89_inline))
1191     Opts.GNUInline = 1;
1192 
1193   if (Args.hasArg(OPT_fapple_kext)) {
1194     if (!Opts.CPlusPlus)
1195       Diags.Report(diag::warn_c_kext);
1196     else
1197       Opts.AppleKext = 1;
1198   }
1199 
1200   if (Args.hasArg(OPT_print_ivar_layout))
1201     Opts.ObjCGCBitmapPrint = 1;
1202   if (Args.hasArg(OPT_fno_constant_cfstrings))
1203     Opts.NoConstantCFStrings = 1;
1204 
1205   if (Args.hasArg(OPT_faltivec))
1206     Opts.AltiVec = 1;
1207 
1208   if (Args.hasArg(OPT_pthread))
1209     Opts.POSIXThreads = 1;
1210 
1211   // The value-visibility mode defaults to "default".
1212   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1213     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1214   } else {
1215     Opts.setValueVisibilityMode(DefaultVisibility);
1216   }
1217 
1218   // The type-visibility mode defaults to the value-visibility mode.
1219   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1220     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1221   } else {
1222     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1223   }
1224 
1225   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1226     Opts.InlineVisibilityHidden = 1;
1227 
1228   if (Args.hasArg(OPT_ftrapv)) {
1229     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1230     // Set the handler, if one is specified.
1231     Opts.OverflowHandler =
1232         Args.getLastArgValue(OPT_ftrapv_handler);
1233   }
1234   else if (Args.hasArg(OPT_fwrapv))
1235     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1236 
1237   if (Args.hasArg(OPT_trigraphs))
1238     Opts.Trigraphs = 1;
1239 
1240   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1241                                    OPT_fno_dollars_in_identifiers,
1242                                    Opts.DollarIdents);
1243   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1244   Opts.MicrosoftExt
1245     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1246   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1247   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1248   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1249   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1250   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1251   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1252                                    Opts.ConstStrings);
1253   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1254     Opts.LaxVectorConversions = 0;
1255   if (Args.hasArg(OPT_fno_threadsafe_statics))
1256     Opts.ThreadsafeStatics = 0;
1257   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1258   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1259   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1260   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1261   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1262 
1263   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1264   Opts.Blocks = Args.hasArg(OPT_fblocks);
1265   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1266   Opts.Modules = Args.hasArg(OPT_fmodules);
1267   Opts.CharIsSigned = !Args.hasArg(OPT_fno_signed_char);
1268   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1269   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1270   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1271   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1272   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1273   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1274   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1275   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1276   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1277   Opts.MathErrno = Args.hasArg(OPT_fmath_errno);
1278   Opts.InstantiationDepth =
1279       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1280   Opts.ConstexprCallDepth =
1281       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1282   Opts.ConstexprStepLimit =
1283       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1284   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1285   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1286   Opts.NumLargeByValueCopy =
1287       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1288   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1289   Opts.ObjCConstantStringClass =
1290     Args.getLastArgValue(OPT_fconstant_string_class);
1291   Opts.ObjCDefaultSynthProperties =
1292     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1293   Opts.EncodeExtendedBlockSig =
1294     Args.hasArg(OPT_fencode_extended_block_signature);
1295   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1296   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1297   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1298   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1299   Opts.Static = Args.hasArg(OPT_static_define);
1300   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1301   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1302                         || Args.hasArg(OPT_fdump_record_layouts);
1303   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1304   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1305   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1306   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1307   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1308   Opts.MRTD = Args.hasArg(OPT_mrtd);
1309   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1310   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1311   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1312   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1313   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1314   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1315   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1316   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1317 
1318   // Check if -fopenmp is specified.
1319   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1320 
1321   // Record whether the __DEPRECATED define was requested.
1322   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1323                                  OPT_fno_deprecated_macro,
1324                                  Opts.Deprecated);
1325 
1326   // FIXME: Eliminate this dependency.
1327   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1328        OptSize = getOptimizationLevelSize(Args);
1329   Opts.Optimize = Opt != 0;
1330   Opts.OptimizeSize = OptSize != 0;
1331 
1332   // This is the __NO_INLINE__ define, which just depends on things like the
1333   // optimization level and -fno-inline, not actually whether the backend has
1334   // inlining enabled.
1335   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1336 
1337   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1338   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1339 
1340   Opts.RetainCommentsFromSystemHeaders =
1341       Args.hasArg(OPT_fretain_comments_from_system_headers);
1342 
1343   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1344   switch (SSP) {
1345   default:
1346     Diags.Report(diag::err_drv_invalid_value)
1347       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1348     break;
1349   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1350   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1351   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1352   }
1353 
1354   // Parse -fsanitize= arguments.
1355   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1356   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1357     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1358     // efficiently map string values to them. Perform the mapping indirectly:
1359     // convert strings to enumerated values, then switch over the enum to set
1360     // the right bitfield value.
1361     enum Sanitizer {
1362 #define SANITIZER(NAME, ID) \
1363       ID,
1364 #include "clang/Basic/Sanitizers.def"
1365       Unknown
1366     };
1367     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1368 #define SANITIZER(NAME, ID) \
1369               .Case(NAME, ID)
1370 #include "clang/Basic/Sanitizers.def"
1371               .Default(Unknown)) {
1372 #define SANITIZER(NAME, ID) \
1373     case ID: \
1374       Opts.Sanitize.ID = true; \
1375       break;
1376 #include "clang/Basic/Sanitizers.def"
1377 
1378     case Unknown:
1379       Diags.Report(diag::err_drv_invalid_value)
1380         << "-fsanitize=" << Sanitizers[I];
1381       break;
1382     }
1383   }
1384 }
1385 
1386 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1387                                   FileManager &FileMgr,
1388                                   DiagnosticsEngine &Diags) {
1389   using namespace options;
1390   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1391   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1392   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1393       Opts.TokenCache = A->getValue();
1394   else
1395     Opts.TokenCache = Opts.ImplicitPTHInclude;
1396   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1397   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1398   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1399 
1400   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1401   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1402          ie = Args.filtered_end(); it != ie; ++it) {
1403     const Arg *A = *it;
1404     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1405   }
1406 
1407   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1408     StringRef Value(A->getValue());
1409     size_t Comma = Value.find(',');
1410     unsigned Bytes = 0;
1411     unsigned EndOfLine = 0;
1412 
1413     if (Comma == StringRef::npos ||
1414         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1415         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1416       Diags.Report(diag::err_drv_preamble_format);
1417     else {
1418       Opts.PrecompiledPreambleBytes.first = Bytes;
1419       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1420     }
1421   }
1422 
1423   // Add macros from the command line.
1424   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1425          ie = Args.filtered_end(); it != ie; ++it) {
1426     if ((*it)->getOption().matches(OPT_D))
1427       Opts.addMacroDef((*it)->getValue());
1428     else
1429       Opts.addMacroUndef((*it)->getValue());
1430   }
1431 
1432   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1433 
1434   // Add the ordered list of -includes.
1435   for (arg_iterator it = Args.filtered_begin(OPT_include),
1436          ie = Args.filtered_end(); it != ie; ++it) {
1437     const Arg *A = *it;
1438     Opts.Includes.push_back(A->getValue());
1439   }
1440 
1441   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1442          ie = Args.filtered_end(); it != ie; ++it) {
1443     const Arg *A = *it;
1444     Opts.ChainedIncludes.push_back(A->getValue());
1445   }
1446 
1447   // Include 'altivec.h' if -faltivec option present
1448   if (Args.hasArg(OPT_faltivec))
1449     Opts.Includes.push_back("altivec.h");
1450 
1451   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1452          ie = Args.filtered_end(); it != ie; ++it) {
1453     const Arg *A = *it;
1454     std::pair<StringRef,StringRef> Split =
1455       StringRef(A->getValue()).split(';');
1456 
1457     if (Split.second.empty()) {
1458       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1459       continue;
1460     }
1461 
1462     Opts.addRemappedFile(Split.first, Split.second);
1463   }
1464 
1465   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1466     StringRef Name = A->getValue();
1467     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1468       .Case("libc++", ARCXX_libcxx)
1469       .Case("libstdc++", ARCXX_libstdcxx)
1470       .Case("none", ARCXX_nolib)
1471       .Default(~0U);
1472     if (Library == ~0U)
1473       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1474     else
1475       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1476   }
1477 }
1478 
1479 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1480                                         ArgList &Args,
1481                                         frontend::ActionKind Action) {
1482   using namespace options;
1483 
1484   switch (Action) {
1485   case frontend::ASTDeclList:
1486   case frontend::ASTDump:
1487   case frontend::ASTDumpXML:
1488   case frontend::ASTPrint:
1489   case frontend::ASTView:
1490   case frontend::EmitAssembly:
1491   case frontend::EmitBC:
1492   case frontend::EmitHTML:
1493   case frontend::EmitLLVM:
1494   case frontend::EmitLLVMOnly:
1495   case frontend::EmitCodeGenOnly:
1496   case frontend::EmitObj:
1497   case frontend::FixIt:
1498   case frontend::GenerateModule:
1499   case frontend::GeneratePCH:
1500   case frontend::GeneratePTH:
1501   case frontend::ParseSyntaxOnly:
1502   case frontend::ModuleFileInfo:
1503   case frontend::PluginAction:
1504   case frontend::PrintDeclContext:
1505   case frontend::RewriteObjC:
1506   case frontend::RewriteTest:
1507   case frontend::RunAnalysis:
1508   case frontend::MigrateSource:
1509     Opts.ShowCPP = 0;
1510     break;
1511 
1512   case frontend::DumpRawTokens:
1513   case frontend::DumpTokens:
1514   case frontend::InitOnly:
1515   case frontend::PrintPreamble:
1516   case frontend::PrintPreprocessedInput:
1517   case frontend::RewriteMacros:
1518   case frontend::RunPreprocessorOnly:
1519     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1520     break;
1521   }
1522 
1523   Opts.ShowComments = Args.hasArg(OPT_C);
1524   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1525   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1526   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1527   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1528 }
1529 
1530 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1531   using namespace options;
1532   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1533   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1534   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1535   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1536   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1537   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1538 
1539   // Use the default target triple if unspecified.
1540   if (Opts.Triple.empty())
1541     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1542 }
1543 
1544 //
1545 
1546 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1547                                         const char *const *ArgBegin,
1548                                         const char *const *ArgEnd,
1549                                         DiagnosticsEngine &Diags) {
1550   bool Success = true;
1551 
1552   // Parse the arguments.
1553   OwningPtr<OptTable> Opts(createDriverOptTable());
1554   unsigned MissingArgIndex, MissingArgCount;
1555   OwningPtr<InputArgList> Args(
1556     Opts->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
1557 
1558   // Check for missing argument error.
1559   if (MissingArgCount) {
1560     Diags.Report(diag::err_drv_missing_argument)
1561       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1562     Success = false;
1563   }
1564 
1565   // Issue errors on unknown arguments.
1566   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1567          ie = Args->filtered_end(); it != ie; ++it) {
1568     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1569     Success = false;
1570   }
1571 
1572   // Issue errors on arguments that are not valid for CC1.
1573   for (ArgList::iterator I = Args->begin(), E = Args->end();
1574        I != E; ++I) {
1575     if ((*I)->getOption().matches(options::OPT_INPUT))
1576       continue;
1577     if (!(*I)->getOption().hasFlag(options::CC1Option)) {
1578       Diags.Report(diag::err_drv_unknown_argument) << (*I)->getAsString(*Args);
1579       Success = false;
1580     }
1581   }
1582 
1583   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1584   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1585   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1586   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1587             && Success;
1588   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1589   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1590   // FIXME: We shouldn't have to pass the DashX option around here
1591   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1592   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1593             && Success;
1594   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1595   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1596     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1597     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1598       Res.getLangOpts()->ObjCExceptions = 1;
1599   }
1600   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1601   // PCH file and find the original header name. Remove the need to do that in
1602   // ParsePreprocessorArgs and remove the FileManager
1603   // parameters from the function and the "FileManager.h" #include.
1604   FileManager FileMgr(Res.getFileSystemOpts());
1605   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1606   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1607                               Res.getFrontendOpts().ProgramAction);
1608   ParseTargetArgs(Res.getTargetOpts(), *Args);
1609 
1610   return Success;
1611 }
1612 
1613 namespace {
1614 
1615   class ModuleSignature {
1616     SmallVector<uint64_t, 16> Data;
1617     unsigned CurBit;
1618     uint64_t CurValue;
1619 
1620   public:
1621     ModuleSignature() : CurBit(0), CurValue(0) { }
1622 
1623     void add(uint64_t Value, unsigned Bits);
1624     void add(StringRef Value);
1625     void flush();
1626 
1627     llvm::APInt getAsInteger() const;
1628   };
1629 }
1630 
1631 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1632   CurValue |= Value << CurBit;
1633   if (CurBit + NumBits < 64) {
1634     CurBit += NumBits;
1635     return;
1636   }
1637 
1638   // Add the current word.
1639   Data.push_back(CurValue);
1640 
1641   if (CurBit)
1642     CurValue = Value >> (64-CurBit);
1643   else
1644     CurValue = 0;
1645   CurBit = (CurBit+NumBits) & 63;
1646 }
1647 
1648 void ModuleSignature::flush() {
1649   if (CurBit == 0)
1650     return;
1651 
1652   Data.push_back(CurValue);
1653   CurBit = 0;
1654   CurValue = 0;
1655 }
1656 
1657 void ModuleSignature::add(StringRef Value) {
1658   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1659     add(*I, 8);
1660 }
1661 
1662 llvm::APInt ModuleSignature::getAsInteger() const {
1663   return llvm::APInt(Data.size() * 64, Data);
1664 }
1665 
1666 std::string CompilerInvocation::getModuleHash() const {
1667   // Note: For QoI reasons, the things we use as a hash here should all be
1668   // dumped via the -module-info flag.
1669   using llvm::hash_code;
1670   using llvm::hash_value;
1671   using llvm::hash_combine;
1672 
1673   // Start the signature with the compiler version.
1674   // FIXME: We'd rather use something more cryptographically sound than
1675   // CityHash, but this will do for now.
1676   hash_code code = hash_value(getClangFullRepositoryVersion());
1677 
1678   // Extend the signature with the language options
1679 #define LANGOPT(Name, Bits, Default, Description) \
1680    code = hash_combine(code, LangOpts->Name);
1681 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1682   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1683 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1684 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1685 #include "clang/Basic/LangOptions.def"
1686 
1687   // Extend the signature with the target options.
1688   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1689                       TargetOpts->ABI, TargetOpts->CXXABI,
1690                       TargetOpts->LinkerVersion);
1691   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1692     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1693 
1694   // Extend the signature with preprocessor options.
1695   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1696   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1697   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1698 
1699   std::vector<StringRef> MacroDefs;
1700   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1701             I = getPreprocessorOpts().Macros.begin(),
1702          IEnd = getPreprocessorOpts().Macros.end();
1703        I != IEnd; ++I) {
1704     // If we're supposed to ignore this macro for the purposes of modules,
1705     // don't put it into the hash.
1706     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1707       // Check whether we're ignoring this macro.
1708       StringRef MacroDef = I->first;
1709       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1710         continue;
1711     }
1712 
1713     code = hash_combine(code, I->first, I->second);
1714   }
1715 
1716   // Extend the signature with the sysroot.
1717   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1718                       hsOpts.UseStandardSystemIncludes,
1719                       hsOpts.UseStandardCXXIncludes,
1720                       hsOpts.UseLibcxx);
1721 
1722   // Darwin-specific hack: if we have a sysroot, use the contents and
1723   // modification time of
1724   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1725   // as part of the module hash.
1726   if (!hsOpts.Sysroot.empty()) {
1727     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1728     SmallString<128> systemVersionFile;
1729     systemVersionFile += hsOpts.Sysroot;
1730     llvm::sys::path::append(systemVersionFile, "System");
1731     llvm::sys::path::append(systemVersionFile, "Library");
1732     llvm::sys::path::append(systemVersionFile, "CoreServices");
1733     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1734     if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
1735       code = hash_combine(code, buffer.get()->getBuffer());
1736 
1737       struct stat statBuf;
1738       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1739         code = hash_combine(code, statBuf.st_mtime);
1740     }
1741   }
1742 
1743   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1744 }
1745 
1746 namespace clang {
1747 
1748 // Declared in clang/Frontend/Utils.h.
1749 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1750                        DiagnosticsEngine *Diags) {
1751   int Res = Default;
1752   if (Arg *A = Args.getLastArg(Id)) {
1753     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1754       if (Diags)
1755         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1756                                                        << A->getValue();
1757     }
1758   }
1759   return Res;
1760 }
1761 }
1762