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/Process.h"
36 #include "llvm/Support/system_error.h"
37 #include <sys/stat.h>
38 using namespace clang;
39 
40 //===----------------------------------------------------------------------===//
41 // Initialization.
42 //===----------------------------------------------------------------------===//
43 
44 CompilerInvocationBase::CompilerInvocationBase()
45   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
46     DiagnosticOpts(new DiagnosticOptions()),
47     HeaderSearchOpts(new HeaderSearchOptions()),
48     PreprocessorOpts(new PreprocessorOptions()) {}
49 
50 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
51   : RefCountedBase<CompilerInvocation>(),
52     LangOpts(new LangOptions(*X.getLangOpts())),
53     TargetOpts(new TargetOptions(X.getTargetOpts())),
54     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
55     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
56     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
57 
58 //===----------------------------------------------------------------------===//
59 // Deserialization (from args)
60 //===----------------------------------------------------------------------===//
61 
62 using namespace clang::driver;
63 using namespace clang::driver::options;
64 using namespace llvm::opt;
65 
66 //
67 
68 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
69                                      DiagnosticsEngine &Diags) {
70   unsigned DefaultOpt = 0;
71   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
72     DefaultOpt = 2;
73 
74   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
75     if (A->getOption().matches(options::OPT_O0))
76       return 0;
77 
78     if (A->getOption().matches(options::OPT_Ofast))
79       return 3;
80 
81     assert (A->getOption().matches(options::OPT_O));
82 
83     StringRef S(A->getValue());
84     if (S == "s" || S == "z" || S.empty())
85       return 2;
86 
87     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
88   }
89 
90   return DefaultOpt;
91 }
92 
93 static unsigned getOptimizationLevelSize(ArgList &Args) {
94   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
95     if (A->getOption().matches(options::OPT_O)) {
96       switch (A->getValue()[0]) {
97       default:
98         return 0;
99       case 's':
100         return 1;
101       case 'z':
102         return 2;
103       }
104     }
105   }
106   return 0;
107 }
108 
109 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
110   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
111          E = Args.filtered_end(); I != E; ++I) {
112     Arg *A = *I;
113     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
114     // to the warning list. Else, add its value (for the OPT_W case).
115     if (A->getOption().getKind() == Option::FlagClass) {
116       Warnings.push_back(A->getOption().getName().substr(1));
117     } else {
118       for (unsigned Idx = 0, End = A->getNumValues();
119            Idx < End; ++Idx) {
120         StringRef V = A->getValue(Idx);
121         // "-Wl," and such are not warning options.
122         // FIXME: Should be handled by putting these in separate flags.
123         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
124           continue;
125 
126         Warnings.push_back(V);
127       }
128     }
129   }
130 }
131 
132 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
133                               DiagnosticsEngine &Diags) {
134   using namespace options;
135   bool Success = true;
136   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
137     StringRef Name = A->getValue();
138     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
139 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
140       .Case(CMDFLAG, NAME##Model)
141 #include "clang/StaticAnalyzer/Core/Analyses.def"
142       .Default(NumStores);
143     if (Value == NumStores) {
144       Diags.Report(diag::err_drv_invalid_value)
145         << A->getAsString(Args) << Name;
146       Success = false;
147     } else {
148       Opts.AnalysisStoreOpt = Value;
149     }
150   }
151 
152   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
153     StringRef Name = A->getValue();
154     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
155 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
156       .Case(CMDFLAG, NAME##Model)
157 #include "clang/StaticAnalyzer/Core/Analyses.def"
158       .Default(NumConstraints);
159     if (Value == NumConstraints) {
160       Diags.Report(diag::err_drv_invalid_value)
161         << A->getAsString(Args) << Name;
162       Success = false;
163     } else {
164       Opts.AnalysisConstraintsOpt = Value;
165     }
166   }
167 
168   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
169     StringRef Name = A->getValue();
170     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
171 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
172       .Case(CMDFLAG, PD_##NAME)
173 #include "clang/StaticAnalyzer/Core/Analyses.def"
174       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
175     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
176       Diags.Report(diag::err_drv_invalid_value)
177         << A->getAsString(Args) << Name;
178       Success = false;
179     } else {
180       Opts.AnalysisDiagOpt = Value;
181     }
182   }
183 
184   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
185     StringRef Name = A->getValue();
186     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
187 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
188       .Case(CMDFLAG, NAME)
189 #include "clang/StaticAnalyzer/Core/Analyses.def"
190       .Default(NumPurgeModes);
191     if (Value == NumPurgeModes) {
192       Diags.Report(diag::err_drv_invalid_value)
193         << A->getAsString(Args) << Name;
194       Success = false;
195     } else {
196       Opts.AnalysisPurgeOpt = Value;
197     }
198   }
199 
200   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
201     StringRef Name = A->getValue();
202     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
203 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
204       .Case(CMDFLAG, NAME)
205 #include "clang/StaticAnalyzer/Core/Analyses.def"
206       .Default(NumInliningModes);
207     if (Value == NumInliningModes) {
208       Diags.Report(diag::err_drv_invalid_value)
209         << A->getAsString(Args) << Name;
210       Success = false;
211     } else {
212       Opts.InliningMode = Value;
213     }
214   }
215 
216   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
217   Opts.visualizeExplodedGraphWithGraphViz =
218     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
219   Opts.visualizeExplodedGraphWithUbiGraph =
220     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
221   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
222   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
223   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
224   Opts.AnalyzeNestedBlocks =
225     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
226   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
227   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
228   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
229   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
230   Opts.maxBlockVisitOnPath =
231       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
232   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
233   Opts.InlineMaxStackDepth =
234       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
235                          Opts.InlineMaxStackDepth, Diags);
236 
237   Opts.CheckersControlList.clear();
238   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
239                                              OPT_analyzer_disable_checker),
240          ie = Args.filtered_end(); it != ie; ++it) {
241     const Arg *A = *it;
242     A->claim();
243     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
244     // We can have a list of comma separated checker names, e.g:
245     // '-analyzer-checker=cocoa,unix'
246     StringRef checkerList = A->getValue();
247     SmallVector<StringRef, 4> checkers;
248     checkerList.split(checkers, ",");
249     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
250       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
251   }
252 
253   // Go through the analyzer configuration options.
254   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
255        ie = Args.filtered_end(); it != ie; ++it) {
256     const Arg *A = *it;
257     A->claim();
258     // We can have a list of comma separated config names, e.g:
259     // '-analyzer-config key1=val1,key2=val2'
260     StringRef configList = A->getValue();
261     SmallVector<StringRef, 4> configVals;
262     configList.split(configVals, ",");
263     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
264       StringRef key, val;
265       llvm::tie(key, val) = configVals[i].split("=");
266       if (val.empty()) {
267         Diags.Report(SourceLocation(),
268                      diag::err_analyzer_config_no_value) << configVals[i];
269         Success = false;
270         break;
271       }
272       if (val.find('=') != StringRef::npos) {
273         Diags.Report(SourceLocation(),
274                      diag::err_analyzer_config_multiple_values)
275           << configVals[i];
276         Success = false;
277         break;
278       }
279       Opts.Config[key] = val;
280     }
281   }
282 
283   return Success;
284 }
285 
286 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
287   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
288   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
289   return true;
290 }
291 
292 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
293   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
294   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
295 }
296 
297 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
298                              DiagnosticsEngine &Diags) {
299   using namespace options;
300   bool Success = true;
301 
302   Opts.OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
303   // TODO: This could be done in Driver
304   unsigned MaxOptLevel = 3;
305   if (Opts.OptimizationLevel > MaxOptLevel) {
306     // If the optimization level is not supported, fall back on the default optimization
307     Diags.Report(diag::warn_drv_optimization_value)
308         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
309     Opts.OptimizationLevel = MaxOptLevel;
310   }
311 
312   // We must always run at least the always inlining pass.
313   Opts.setInlining(
314     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
315                                  : CodeGenOptions::OnlyAlwaysInlining);
316   // -fno-inline-functions overrides OptimizationLevel > 1.
317   Opts.NoInline = Args.hasArg(OPT_fno_inline);
318   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
319                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
320 
321   if (Args.hasArg(OPT_gline_tables_only)) {
322     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
323   } else if (Args.hasArg(OPT_g_Flag) || Args.hasArg(OPT_gdwarf_2) ||
324              Args.hasArg(OPT_gdwarf_3) || Args.hasArg(OPT_gdwarf_4)) {
325     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
326       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
327     else
328       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
329   }
330   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
331   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
332   if (Args.hasArg(OPT_gdwarf_2))
333     Opts.DwarfVersion = 2;
334   else if (Args.hasArg(OPT_gdwarf_3))
335     Opts.DwarfVersion = 3;
336   else if (Args.hasArg(OPT_gdwarf_4))
337     Opts.DwarfVersion = 4;
338   else if (Opts.getDebugInfo() != CodeGenOptions::NoDebugInfo)
339     // Default Dwarf version is 4 if we are generating debug information.
340     Opts.DwarfVersion = 4;
341 
342   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
343   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
344   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
345   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
346     OPT_fuse_register_sized_bitfield_access);
347   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
348   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
349   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
350   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
351   Opts.NoCommon = Args.hasArg(OPT_fno_common);
352   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
353   Opts.OptimizeSize = getOptimizationLevelSize(Args);
354   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
355                             Args.hasArg(OPT_ffreestanding));
356   Opts.UnrollLoops =
357       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
358                    (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize));
359   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
360 
361   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
362   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
363   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
364   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
365   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
366   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
367   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
368   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
369   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
370   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
371   Opts.DisableFree = Args.hasArg(OPT_disable_free);
372   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
373   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
374   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
375   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
376   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
377   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
378                        Args.hasArg(OPT_cl_finite_math_only)||
379                        Args.hasArg(OPT_cl_fast_relaxed_math));
380   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
381                        Args.hasArg(OPT_cl_finite_math_only)||
382                        Args.hasArg(OPT_cl_fast_relaxed_math));
383   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
384   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
385   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
386   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
387   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
388   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
389   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
390   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
391   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
392   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
393   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
394   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
395   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
396   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
397                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
398                       Args.hasArg(OPT_cl_fast_relaxed_math);
399   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
400   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
401   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
402   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
403 
404   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
405                                        OPT_fno_function_sections, false);
406   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
407                                    OPT_fno_data_sections, false);
408 
409   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
410   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
411   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
412 
413   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
414   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
415   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
416 
417   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
418   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
419   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
420   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
421   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
422     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
423     Opts.CoverageNoFunctionNamesInData =
424         Args.hasArg(OPT_coverage_no_function_names_in_data);
425     if (Args.hasArg(OPT_coverage_version_EQ)) {
426       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
427       if (CoverageVersion.size() != 4) {
428         Diags.Report(diag::err_drv_invalid_value)
429             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
430             << CoverageVersion;
431       } else {
432         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
433       }
434     }
435   }
436 
437   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
438   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
439   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
440   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
441   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
442   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
443   Opts.SanitizeMemoryTrackOrigins =
444     Args.hasArg(OPT_fsanitize_memory_track_origins);
445   Opts.SanitizeAddressZeroBaseShadow =
446     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
447   Opts.SanitizeUndefinedTrapOnError =
448     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
449   Opts.SSPBufferSize =
450       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
451   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
452   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
453     StringRef Val = A->getValue();
454     unsigned StackAlignment = Opts.StackAlignment;
455     Val.getAsInteger(10, StackAlignment);
456     Opts.StackAlignment = StackAlignment;
457   }
458 
459   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
460     StringRef Name = A->getValue();
461     unsigned Method = llvm::StringSwitch<unsigned>(Name)
462       .Case("legacy", CodeGenOptions::Legacy)
463       .Case("non-legacy", CodeGenOptions::NonLegacy)
464       .Case("mixed", CodeGenOptions::Mixed)
465       .Default(~0U);
466     if (Method == ~0U) {
467       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
468       Success = false;
469     } else {
470       Opts.setObjCDispatchMethod(
471         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
472     }
473   }
474 
475   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
476     StringRef Name = A->getValue();
477     unsigned Model = llvm::StringSwitch<unsigned>(Name)
478         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
479         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
480         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
481         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
482         .Default(~0U);
483     if (Model == ~0U) {
484       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
485       Success = false;
486     } else {
487       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
488     }
489   }
490 
491   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
492     StringRef Val = A->getValue();
493     if (Val == "fast")
494       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
495     else if (Val == "on")
496       Opts.setFPContractMode(CodeGenOptions::FPC_On);
497     else if (Val == "off")
498       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
499     else
500       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
501   }
502 
503   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
504     if (A->getOption().matches(OPT_fpcc_struct_return)) {
505       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
506     } else {
507       assert(A->getOption().matches(OPT_freg_struct_return));
508       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
509     }
510   }
511 
512   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
513 
514   return Success;
515 }
516 
517 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
518                                       ArgList &Args) {
519   using namespace options;
520   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
521   Opts.Targets = Args.getAllArgValues(OPT_MT);
522   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
523   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
524   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
525   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
526   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
527   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
528   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
529 }
530 
531 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
532                                 DiagnosticsEngine *Diags) {
533   using namespace options;
534   bool Success = true;
535 
536   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
537   Opts.DiagnosticSerializationFile =
538     Args.getLastArgValue(OPT_diagnostic_serialized_file);
539   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
540   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
541   Opts.Pedantic = Args.hasArg(OPT_pedantic);
542   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
543   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
544   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
545   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
546                                  OPT_fno_show_column,
547                                  /*Default=*/true);
548   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
549   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
550   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
551 
552   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
553 
554   // Default behavior is to not to show note include stacks.
555   Opts.ShowNoteIncludeStack = false;
556   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
557                                OPT_fno_diagnostics_show_note_include_stack))
558     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
559       Opts.ShowNoteIncludeStack = true;
560 
561   StringRef ShowOverloads =
562     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
563   if (ShowOverloads == "best")
564     Opts.setShowOverloads(Ovl_Best);
565   else if (ShowOverloads == "all")
566     Opts.setShowOverloads(Ovl_All);
567   else {
568     Success = false;
569     if (Diags)
570       Diags->Report(diag::err_drv_invalid_value)
571       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
572       << ShowOverloads;
573   }
574 
575   StringRef ShowCategory =
576     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
577   if (ShowCategory == "none")
578     Opts.ShowCategories = 0;
579   else if (ShowCategory == "id")
580     Opts.ShowCategories = 1;
581   else if (ShowCategory == "name")
582     Opts.ShowCategories = 2;
583   else {
584     Success = false;
585     if (Diags)
586       Diags->Report(diag::err_drv_invalid_value)
587       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
588       << ShowCategory;
589   }
590 
591   StringRef Format =
592     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
593   if (Format == "clang")
594     Opts.setFormat(DiagnosticOptions::Clang);
595   else if (Format == "msvc")
596     Opts.setFormat(DiagnosticOptions::Msvc);
597   else if (Format == "msvc-fallback") {
598     Opts.setFormat(DiagnosticOptions::Msvc);
599     Opts.CLFallbackMode = true;
600   } else if (Format == "vi")
601     Opts.setFormat(DiagnosticOptions::Vi);
602   else {
603     Success = false;
604     if (Diags)
605       Diags->Report(diag::err_drv_invalid_value)
606       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
607       << Format;
608   }
609 
610   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
611   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
612   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
613   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
614   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
615   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
616   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
617   Opts.MacroBacktraceLimit =
618       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
619                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
620   Opts.TemplateBacktraceLimit = getLastArgIntValue(
621       Args, OPT_ftemplate_backtrace_limit,
622       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
623   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
624       Args, OPT_fconstexpr_backtrace_limit,
625       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
626   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
627                                     DiagnosticOptions::DefaultTabStop, Diags);
628   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
629     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
630     if (Diags)
631       Diags->Report(diag::warn_ignoring_ftabstop_value)
632       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
633   }
634   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
635   addWarningArgs(Args, Opts.Warnings);
636 
637   return Success;
638 }
639 
640 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
641   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
642 }
643 
644 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
645                                    DiagnosticsEngine &Diags) {
646   using namespace options;
647   Opts.ProgramAction = frontend::ParseSyntaxOnly;
648   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
649     switch (A->getOption().getID()) {
650     default:
651       llvm_unreachable("Invalid option in group!");
652     case OPT_ast_list:
653       Opts.ProgramAction = frontend::ASTDeclList; break;
654     case OPT_ast_dump:
655       Opts.ProgramAction = frontend::ASTDump; break;
656     case OPT_ast_print:
657       Opts.ProgramAction = frontend::ASTPrint; break;
658     case OPT_ast_view:
659       Opts.ProgramAction = frontend::ASTView; break;
660     case OPT_dump_raw_tokens:
661       Opts.ProgramAction = frontend::DumpRawTokens; break;
662     case OPT_dump_tokens:
663       Opts.ProgramAction = frontend::DumpTokens; break;
664     case OPT_S:
665       Opts.ProgramAction = frontend::EmitAssembly; break;
666     case OPT_emit_llvm_bc:
667       Opts.ProgramAction = frontend::EmitBC; break;
668     case OPT_emit_html:
669       Opts.ProgramAction = frontend::EmitHTML; break;
670     case OPT_emit_llvm:
671       Opts.ProgramAction = frontend::EmitLLVM; break;
672     case OPT_emit_llvm_only:
673       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
674     case OPT_emit_codegen_only:
675       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
676     case OPT_emit_obj:
677       Opts.ProgramAction = frontend::EmitObj; break;
678     case OPT_fixit_EQ:
679       Opts.FixItSuffix = A->getValue();
680       // fall-through!
681     case OPT_fixit:
682       Opts.ProgramAction = frontend::FixIt; break;
683     case OPT_emit_module:
684       Opts.ProgramAction = frontend::GenerateModule; break;
685     case OPT_emit_pch:
686       Opts.ProgramAction = frontend::GeneratePCH; break;
687     case OPT_emit_pth:
688       Opts.ProgramAction = frontend::GeneratePTH; break;
689     case OPT_init_only:
690       Opts.ProgramAction = frontend::InitOnly; break;
691     case OPT_fsyntax_only:
692       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
693     case OPT_module_file_info:
694       Opts.ProgramAction = frontend::ModuleFileInfo; break;
695     case OPT_print_decl_contexts:
696       Opts.ProgramAction = frontend::PrintDeclContext; break;
697     case OPT_print_preamble:
698       Opts.ProgramAction = frontend::PrintPreamble; break;
699     case OPT_E:
700       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
701     case OPT_rewrite_macros:
702       Opts.ProgramAction = frontend::RewriteMacros; break;
703     case OPT_rewrite_objc:
704       Opts.ProgramAction = frontend::RewriteObjC; break;
705     case OPT_rewrite_test:
706       Opts.ProgramAction = frontend::RewriteTest; break;
707     case OPT_analyze:
708       Opts.ProgramAction = frontend::RunAnalysis; break;
709     case OPT_migrate:
710       Opts.ProgramAction = frontend::MigrateSource; break;
711     case OPT_Eonly:
712       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
713     }
714   }
715 
716   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
717     Opts.Plugins.push_back(A->getValue(0));
718     Opts.ProgramAction = frontend::PluginAction;
719     Opts.ActionName = A->getValue();
720 
721     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
722            end = Args.filtered_end(); it != end; ++it) {
723       if ((*it)->getValue(0) == Opts.ActionName)
724         Opts.PluginArgs.push_back((*it)->getValue(1));
725     }
726   }
727 
728   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
729   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
730   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
731     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
732            end = Args.filtered_end(); it != end; ++it) {
733       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
734         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
735     }
736   }
737 
738   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
739     Opts.CodeCompletionAt =
740       ParsedSourceLocation::FromString(A->getValue());
741     if (Opts.CodeCompletionAt.FileName.empty())
742       Diags.Report(diag::err_drv_invalid_value)
743         << A->getAsString(Args) << A->getValue();
744   }
745   Opts.DisableFree = Args.hasArg(OPT_disable_free);
746 
747   Opts.OutputFile = Args.getLastArgValue(OPT_o);
748   Opts.Plugins = Args.getAllArgValues(OPT_load);
749   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
750   Opts.ShowHelp = Args.hasArg(OPT_help);
751   Opts.ShowStats = Args.hasArg(OPT_print_stats);
752   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
753   Opts.ShowVersion = Args.hasArg(OPT_version);
754   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
755   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
756   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
757   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
758   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
759   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
760   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
761   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
762   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
763   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
764 
765   Opts.CodeCompleteOpts.IncludeMacros
766     = Args.hasArg(OPT_code_completion_macros);
767   Opts.CodeCompleteOpts.IncludeCodePatterns
768     = Args.hasArg(OPT_code_completion_patterns);
769   Opts.CodeCompleteOpts.IncludeGlobals
770     = !Args.hasArg(OPT_no_code_completion_globals);
771   Opts.CodeCompleteOpts.IncludeBriefComments
772     = Args.hasArg(OPT_code_completion_brief_comments);
773 
774   Opts.OverrideRecordLayoutsFile
775     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
776   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
777                                      OPT_arcmt_modify,
778                                      OPT_arcmt_migrate)) {
779     switch (A->getOption().getID()) {
780     default:
781       llvm_unreachable("missed a case");
782     case OPT_arcmt_check:
783       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
784       break;
785     case OPT_arcmt_modify:
786       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
787       break;
788     case OPT_arcmt_migrate:
789       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
790       break;
791     }
792   }
793   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
794   Opts.ARCMTMigrateReportOut
795     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
796   Opts.ARCMTMigrateEmitARCErrors
797     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
798 
799   if (Args.hasArg(OPT_objcmt_migrate_literals))
800     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
801   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
802     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
803   if (Args.hasArg(OPT_objcmt_migrate_property))
804     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
805   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
806     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
807   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
808     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
809   if (Args.hasArg(OPT_objcmt_migrate_annotation))
810     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
811   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
812     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
813   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
814     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
815   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
816     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
817   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
818     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
819   if (Args.hasArg(OPT_objcmt_atomic_property))
820     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
821   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
822     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
823   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
824     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
825   if (Args.hasArg(OPT_objcmt_migrate_all))
826     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
827 
828   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
829 
830   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
831       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
832     Diags.Report(diag::err_drv_argument_not_allowed_with)
833       << "ARC migration" << "ObjC migration";
834   }
835 
836   InputKind DashX = IK_None;
837   if (const Arg *A = Args.getLastArg(OPT_x)) {
838     DashX = llvm::StringSwitch<InputKind>(A->getValue())
839       .Case("c", IK_C)
840       .Case("cl", IK_OpenCL)
841       .Case("cuda", IK_CUDA)
842       .Case("c++", IK_CXX)
843       .Case("objective-c", IK_ObjC)
844       .Case("objective-c++", IK_ObjCXX)
845       .Case("cpp-output", IK_PreprocessedC)
846       .Case("assembler-with-cpp", IK_Asm)
847       .Case("c++-cpp-output", IK_PreprocessedCXX)
848       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
849       .Case("objc-cpp-output", IK_PreprocessedObjC)
850       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
851       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
852       .Case("c-header", IK_C)
853       .Case("cl-header", IK_OpenCL)
854       .Case("objective-c-header", IK_ObjC)
855       .Case("c++-header", IK_CXX)
856       .Case("objective-c++-header", IK_ObjCXX)
857       .Cases("ast", "pcm", IK_AST)
858       .Case("ir", IK_LLVM_IR)
859       .Default(IK_None);
860     if (DashX == IK_None)
861       Diags.Report(diag::err_drv_invalid_value)
862         << A->getAsString(Args) << A->getValue();
863   }
864 
865   // '-' is the default input if none is given.
866   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
867   Opts.Inputs.clear();
868   if (Inputs.empty())
869     Inputs.push_back("-");
870   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
871     InputKind IK = DashX;
872     if (IK == IK_None) {
873       IK = FrontendOptions::getInputKindForExtension(
874         StringRef(Inputs[i]).rsplit('.').second);
875       // FIXME: Remove this hack.
876       if (i == 0)
877         DashX = IK;
878     }
879     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
880   }
881 
882   return DashX;
883 }
884 
885 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
886                                                  void *MainAddr) {
887   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
888 
889   if (!P.empty()) {
890     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
891     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
892 
893     // Get foo/lib/clang/<version>/include
894     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
895   }
896 
897   return P.str();
898 }
899 
900 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
901   using namespace options;
902   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
903   Opts.Verbose = Args.hasArg(OPT_v);
904   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
905   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
906   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
907   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
908     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
909   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
910   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
911   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
912   // -fmodules implies -fmodule-maps
913   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
914   Opts.ModuleCachePruneInterval =
915       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
916   Opts.ModuleCachePruneAfter =
917       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
918   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
919                     ie = Args.filtered_end();
920        it != ie; ++it) {
921     StringRef MacroDef = (*it)->getValue();
922     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
923   }
924   std::vector<std::string> ModuleMapFiles =
925       Args.getAllArgValues(OPT_fmodule_map_file);
926   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
927 
928   // Add -I..., -F..., and -index-header-map options in order.
929   bool IsIndexHeaderMap = false;
930   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
931                                              OPT_index_header_map),
932        ie = Args.filtered_end(); it != ie; ++it) {
933     if ((*it)->getOption().matches(OPT_index_header_map)) {
934       // -index-header-map applies to the next -I or -F.
935       IsIndexHeaderMap = true;
936       continue;
937     }
938 
939     frontend::IncludeDirGroup Group
940       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
941 
942     Opts.AddPath((*it)->getValue(), Group,
943                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
944     IsIndexHeaderMap = false;
945   }
946 
947   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
948   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
949   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
950                                              OPT_iwithprefixbefore),
951          ie = Args.filtered_end(); it != ie; ++it) {
952     const Arg *A = *it;
953     if (A->getOption().matches(OPT_iprefix))
954       Prefix = A->getValue();
955     else if (A->getOption().matches(OPT_iwithprefix))
956       Opts.AddPath(Prefix.str() + A->getValue(),
957                    frontend::After, false, true);
958     else
959       Opts.AddPath(Prefix.str() + A->getValue(),
960                    frontend::Angled, false, true);
961   }
962 
963   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
964          ie = Args.filtered_end(); it != ie; ++it)
965     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
966   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
967          ie = Args.filtered_end(); it != ie; ++it)
968     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
969   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
970          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
971     Opts.AddPath((*it)->getValue(), frontend::System, false,
972                  !(*it)->getOption().matches(OPT_iwithsysroot));
973   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
974          ie = Args.filtered_end(); it != ie; ++it)
975     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
976 
977   // Add the paths for the various language specific isystem flags.
978   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
979        ie = Args.filtered_end(); it != ie; ++it)
980     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
981   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
982        ie = Args.filtered_end(); it != ie; ++it)
983     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
984   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
985        ie = Args.filtered_end(); it != ie; ++it)
986     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
987   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
988        ie = Args.filtered_end(); it != ie; ++it)
989     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
990 
991   // Add the internal paths from a driver that detects standard include paths.
992   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
993                                             OPT_internal_externc_isystem),
994                     E = Args.filtered_end();
995        I != E; ++I) {
996     frontend::IncludeDirGroup Group = frontend::System;
997     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
998       Group = frontend::ExternCSystem;
999     Opts.AddPath((*I)->getValue(), Group, false, true);
1000   }
1001 
1002   // Add the path prefixes which are implicitly treated as being system headers.
1003   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
1004                                             OPT_ino_system_prefix),
1005                     E = Args.filtered_end();
1006        I != E; ++I)
1007     Opts.AddSystemHeaderPrefix((*I)->getValue(),
1008                                (*I)->getOption().matches(OPT_isystem_prefix));
1009 }
1010 
1011 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1012                                          LangStandard::Kind LangStd) {
1013   // Set some properties which depend solely on the input kind; it would be nice
1014   // to move these to the language standard, and have the driver resolve the
1015   // input kind + language standard.
1016   if (IK == IK_Asm) {
1017     Opts.AsmPreprocessor = 1;
1018   } else if (IK == IK_ObjC ||
1019              IK == IK_ObjCXX ||
1020              IK == IK_PreprocessedObjC ||
1021              IK == IK_PreprocessedObjCXX) {
1022     Opts.ObjC1 = Opts.ObjC2 = 1;
1023   }
1024 
1025   if (LangStd == LangStandard::lang_unspecified) {
1026     // Based on the base language, pick one.
1027     switch (IK) {
1028     case IK_None:
1029     case IK_AST:
1030     case IK_LLVM_IR:
1031       llvm_unreachable("Invalid input kind!");
1032     case IK_OpenCL:
1033       LangStd = LangStandard::lang_opencl;
1034       break;
1035     case IK_CUDA:
1036       LangStd = LangStandard::lang_cuda;
1037       break;
1038     case IK_Asm:
1039     case IK_C:
1040     case IK_PreprocessedC:
1041     case IK_ObjC:
1042     case IK_PreprocessedObjC:
1043       LangStd = LangStandard::lang_gnu99;
1044       break;
1045     case IK_CXX:
1046     case IK_PreprocessedCXX:
1047     case IK_ObjCXX:
1048     case IK_PreprocessedObjCXX:
1049       LangStd = LangStandard::lang_gnucxx98;
1050       break;
1051     }
1052   }
1053 
1054   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1055   Opts.LineComment = Std.hasLineComments();
1056   Opts.C99 = Std.isC99();
1057   Opts.C11 = Std.isC11();
1058   Opts.CPlusPlus = Std.isCPlusPlus();
1059   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1060   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1061   Opts.Digraphs = Std.hasDigraphs();
1062   Opts.GNUMode = Std.isGNUMode();
1063   Opts.GNUInline = !Std.isC99();
1064   Opts.HexFloats = Std.hasHexFloats();
1065   Opts.ImplicitInt = Std.hasImplicitInt();
1066 
1067   // Set OpenCL Version.
1068   if (LangStd == LangStandard::lang_opencl) {
1069     Opts.OpenCL = 1;
1070     Opts.OpenCLVersion = 100;
1071   }
1072   else if (LangStd == LangStandard::lang_opencl11) {
1073       Opts.OpenCL = 1;
1074       Opts.OpenCLVersion = 110;
1075   }
1076   else if (LangStd == LangStandard::lang_opencl12) {
1077     Opts.OpenCL = 1;
1078     Opts.OpenCLVersion = 120;
1079   }
1080 
1081   // OpenCL has some additional defaults.
1082   if (Opts.OpenCL) {
1083     Opts.AltiVec = 0;
1084     Opts.CXXOperatorNames = 1;
1085     Opts.LaxVectorConversions = 0;
1086     Opts.DefaultFPContract = 1;
1087     Opts.NativeHalfType = 1;
1088   }
1089 
1090   if (LangStd == LangStandard::lang_cuda)
1091     Opts.CUDA = 1;
1092 
1093   // OpenCL and C++ both have bool, true, false keywords.
1094   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1095 
1096   // C++ has wchar_t keyword.
1097   Opts.WChar = Opts.CPlusPlus;
1098 
1099   Opts.GNUKeywords = Opts.GNUMode;
1100   Opts.CXXOperatorNames = Opts.CPlusPlus;
1101 
1102   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1103   // is specified, or -std is set to a conforming mode.
1104   Opts.Trigraphs = !Opts.GNUMode;
1105 
1106   Opts.DollarIdents = !Opts.AsmPreprocessor;
1107 
1108   // C++1y onwards has sized global deallocation functions.
1109   Opts.SizedDeallocation = Opts.CPlusPlus1y;
1110 }
1111 
1112 /// Attempt to parse a visibility value out of the given argument.
1113 static Visibility parseVisibility(Arg *arg, ArgList &args,
1114                                   DiagnosticsEngine &diags) {
1115   StringRef value = arg->getValue();
1116   if (value == "default") {
1117     return DefaultVisibility;
1118   } else if (value == "hidden") {
1119     return HiddenVisibility;
1120   } else if (value == "protected") {
1121     // FIXME: diagnose if target does not support protected visibility
1122     return ProtectedVisibility;
1123   }
1124 
1125   diags.Report(diag::err_drv_invalid_value)
1126     << arg->getAsString(args) << value;
1127   return DefaultVisibility;
1128 }
1129 
1130 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1131                           DiagnosticsEngine &Diags) {
1132   // FIXME: Cleanup per-file based stuff.
1133   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1134   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1135     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1136 #define LANGSTANDARD(id, name, desc, features) \
1137       .Case(name, LangStandard::lang_##id)
1138 #include "clang/Frontend/LangStandards.def"
1139       .Default(LangStandard::lang_unspecified);
1140     if (LangStd == LangStandard::lang_unspecified)
1141       Diags.Report(diag::err_drv_invalid_value)
1142         << A->getAsString(Args) << A->getValue();
1143     else {
1144       // Valid standard, check to make sure language and standard are
1145       // compatible.
1146       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1147       switch (IK) {
1148       case IK_C:
1149       case IK_ObjC:
1150       case IK_PreprocessedC:
1151       case IK_PreprocessedObjC:
1152         if (!(Std.isC89() || Std.isC99()))
1153           Diags.Report(diag::err_drv_argument_not_allowed_with)
1154             << A->getAsString(Args) << "C/ObjC";
1155         break;
1156       case IK_CXX:
1157       case IK_ObjCXX:
1158       case IK_PreprocessedCXX:
1159       case IK_PreprocessedObjCXX:
1160         if (!Std.isCPlusPlus())
1161           Diags.Report(diag::err_drv_argument_not_allowed_with)
1162             << A->getAsString(Args) << "C++/ObjC++";
1163         break;
1164       case IK_OpenCL:
1165         if (!Std.isC99())
1166           Diags.Report(diag::err_drv_argument_not_allowed_with)
1167             << A->getAsString(Args) << "OpenCL";
1168         break;
1169       case IK_CUDA:
1170         if (!Std.isCPlusPlus())
1171           Diags.Report(diag::err_drv_argument_not_allowed_with)
1172             << A->getAsString(Args) << "CUDA";
1173         break;
1174       default:
1175         break;
1176       }
1177     }
1178   }
1179 
1180   // -cl-std only applies for OpenCL language standards.
1181   // Override the -std option in this case.
1182   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1183     LangStandard::Kind OpenCLLangStd
1184     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1185     .Case("CL", LangStandard::lang_opencl)
1186     .Case("CL1.1", LangStandard::lang_opencl11)
1187     .Case("CL1.2", LangStandard::lang_opencl12)
1188     .Default(LangStandard::lang_unspecified);
1189 
1190     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1191       Diags.Report(diag::err_drv_invalid_value)
1192       << A->getAsString(Args) << A->getValue();
1193     }
1194     else
1195       LangStd = OpenCLLangStd;
1196   }
1197 
1198   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1199 
1200   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1201   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1202   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1203   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1204   // name, as it doesn't seem a useful distinction.
1205   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1206                                   Opts.GNUKeywords);
1207 
1208   if (Args.hasArg(OPT_fno_operator_names))
1209     Opts.CXXOperatorNames = 0;
1210 
1211   if (Opts.ObjC1) {
1212     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1213       StringRef value = arg->getValue();
1214       if (Opts.ObjCRuntime.tryParse(value))
1215         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1216     }
1217 
1218     if (Args.hasArg(OPT_fobjc_gc_only))
1219       Opts.setGC(LangOptions::GCOnly);
1220     else if (Args.hasArg(OPT_fobjc_gc))
1221       Opts.setGC(LangOptions::HybridGC);
1222     else if (Args.hasArg(OPT_fobjc_arc)) {
1223       Opts.ObjCAutoRefCount = 1;
1224       if (!Opts.ObjCRuntime.allowsARC())
1225         Diags.Report(diag::err_arc_unsupported_on_runtime);
1226 
1227       // Only set ObjCARCWeak if ARC is enabled.
1228       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1229         Opts.ObjCARCWeak = 1;
1230       else
1231         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1232     }
1233 
1234     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1235       Opts.ObjCInferRelatedResultType = 0;
1236 
1237     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1238       Opts.ObjCSubscriptingLegacyRuntime =
1239         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1240   }
1241 
1242   if (Args.hasArg(OPT_fgnu89_inline))
1243     Opts.GNUInline = 1;
1244 
1245   if (Args.hasArg(OPT_fapple_kext)) {
1246     if (!Opts.CPlusPlus)
1247       Diags.Report(diag::warn_c_kext);
1248     else
1249       Opts.AppleKext = 1;
1250   }
1251 
1252   if (Args.hasArg(OPT_print_ivar_layout))
1253     Opts.ObjCGCBitmapPrint = 1;
1254   if (Args.hasArg(OPT_fno_constant_cfstrings))
1255     Opts.NoConstantCFStrings = 1;
1256 
1257   if (Args.hasArg(OPT_faltivec))
1258     Opts.AltiVec = 1;
1259 
1260   if (Args.hasArg(OPT_pthread))
1261     Opts.POSIXThreads = 1;
1262 
1263   // The value-visibility mode defaults to "default".
1264   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1265     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1266   } else {
1267     Opts.setValueVisibilityMode(DefaultVisibility);
1268   }
1269 
1270   // The type-visibility mode defaults to the value-visibility mode.
1271   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1272     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1273   } else {
1274     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1275   }
1276 
1277   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1278     Opts.InlineVisibilityHidden = 1;
1279 
1280   if (Args.hasArg(OPT_ftrapv)) {
1281     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1282     // Set the handler, if one is specified.
1283     Opts.OverflowHandler =
1284         Args.getLastArgValue(OPT_ftrapv_handler);
1285   }
1286   else if (Args.hasArg(OPT_fwrapv))
1287     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1288 
1289   if (Args.hasArg(OPT_trigraphs))
1290     Opts.Trigraphs = 1;
1291 
1292   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1293                                    OPT_fno_dollars_in_identifiers,
1294                                    Opts.DollarIdents);
1295   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1296   Opts.MicrosoftExt
1297     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1298   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1299   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1300   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1301   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1302   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1303   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1304                                    Opts.ConstStrings);
1305   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1306     Opts.LaxVectorConversions = 0;
1307   if (Args.hasArg(OPT_fno_threadsafe_statics))
1308     Opts.ThreadsafeStatics = 0;
1309   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1310   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1311   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1312   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1313   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1314 
1315   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1316   Opts.Blocks = Args.hasArg(OPT_fblocks);
1317   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1318   Opts.Modules = Args.hasArg(OPT_fmodules);
1319   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1320   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1321   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1322   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1323   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1324   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1325   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1326   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1327   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1328   Opts.SizedDeallocation |= Args.hasArg(OPT_fsized_deallocation);
1329   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1330   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1331   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1332   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1333   Opts.InstantiationDepth =
1334       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1335   Opts.ArrowDepth =
1336       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1337   Opts.ConstexprCallDepth =
1338       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1339   Opts.ConstexprStepLimit =
1340       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1341   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1342   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1343   Opts.NumLargeByValueCopy =
1344       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1345   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1346   Opts.ObjCConstantStringClass =
1347     Args.getLastArgValue(OPT_fconstant_string_class);
1348   Opts.ObjCDefaultSynthProperties =
1349     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1350   Opts.EncodeExtendedBlockSig =
1351     Args.hasArg(OPT_fencode_extended_block_signature);
1352   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1353   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1354   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1355   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1356   Opts.Static = Args.hasArg(OPT_static_define);
1357   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1358   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1359                         || Args.hasArg(OPT_fdump_record_layouts);
1360   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1361   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1362   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1363   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1364   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1365   Opts.MRTD = Args.hasArg(OPT_mrtd);
1366   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1367   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1368   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1369   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1370   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1371   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1372   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1373   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1374 
1375   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1376     switch (llvm::StringSwitch<unsigned>(A->getValue())
1377       .Case("target", LangOptions::ASMM_Target)
1378       .Case("no", LangOptions::ASMM_Off)
1379       .Case("yes", LangOptions::ASMM_On)
1380       .Default(255)) {
1381     default:
1382       Diags.Report(diag::err_drv_invalid_value)
1383         << "-faddress-space-map-mangling=" << A->getValue();
1384       break;
1385     case LangOptions::ASMM_Target:
1386       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1387       break;
1388     case LangOptions::ASMM_On:
1389       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1390       break;
1391     case LangOptions::ASMM_Off:
1392       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1393       break;
1394     }
1395   }
1396 
1397   // Check if -fopenmp is specified.
1398   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1399 
1400   // Record whether the __DEPRECATED define was requested.
1401   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1402                                  OPT_fno_deprecated_macro,
1403                                  Opts.Deprecated);
1404 
1405   // FIXME: Eliminate this dependency.
1406   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1407        OptSize = getOptimizationLevelSize(Args);
1408   Opts.Optimize = Opt != 0;
1409   Opts.OptimizeSize = OptSize != 0;
1410 
1411   // This is the __NO_INLINE__ define, which just depends on things like the
1412   // optimization level and -fno-inline, not actually whether the backend has
1413   // inlining enabled.
1414   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1415 
1416   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1417   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1418 
1419   Opts.RetainCommentsFromSystemHeaders =
1420       Args.hasArg(OPT_fretain_comments_from_system_headers);
1421 
1422   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1423   switch (SSP) {
1424   default:
1425     Diags.Report(diag::err_drv_invalid_value)
1426       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1427     break;
1428   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1429   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1430   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1431   }
1432 
1433   // Parse -fsanitize= arguments.
1434   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1435   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1436     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1437     // efficiently map string values to them. Perform the mapping indirectly:
1438     // convert strings to enumerated values, then switch over the enum to set
1439     // the right bitfield value.
1440     enum Sanitizer {
1441 #define SANITIZER(NAME, ID) \
1442       ID,
1443 #include "clang/Basic/Sanitizers.def"
1444       Unknown
1445     };
1446     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1447 #define SANITIZER(NAME, ID) \
1448               .Case(NAME, ID)
1449 #include "clang/Basic/Sanitizers.def"
1450               .Default(Unknown)) {
1451 #define SANITIZER(NAME, ID) \
1452     case ID: \
1453       Opts.Sanitize.ID = true; \
1454       break;
1455 #include "clang/Basic/Sanitizers.def"
1456 
1457     case Unknown:
1458       Diags.Report(diag::err_drv_invalid_value)
1459         << "-fsanitize=" << Sanitizers[I];
1460       break;
1461     }
1462   }
1463 }
1464 
1465 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1466                                   FileManager &FileMgr,
1467                                   DiagnosticsEngine &Diags) {
1468   using namespace options;
1469   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1470   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1471   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1472       Opts.TokenCache = A->getValue();
1473   else
1474     Opts.TokenCache = Opts.ImplicitPTHInclude;
1475   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1476   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1477   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1478 
1479   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1480   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1481          ie = Args.filtered_end(); it != ie; ++it) {
1482     const Arg *A = *it;
1483     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1484   }
1485 
1486   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1487     StringRef Value(A->getValue());
1488     size_t Comma = Value.find(',');
1489     unsigned Bytes = 0;
1490     unsigned EndOfLine = 0;
1491 
1492     if (Comma == StringRef::npos ||
1493         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1494         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1495       Diags.Report(diag::err_drv_preamble_format);
1496     else {
1497       Opts.PrecompiledPreambleBytes.first = Bytes;
1498       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1499     }
1500   }
1501 
1502   // Add macros from the command line.
1503   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1504          ie = Args.filtered_end(); it != ie; ++it) {
1505     if ((*it)->getOption().matches(OPT_D))
1506       Opts.addMacroDef((*it)->getValue());
1507     else
1508       Opts.addMacroUndef((*it)->getValue());
1509   }
1510 
1511   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1512 
1513   // Add the ordered list of -includes.
1514   for (arg_iterator it = Args.filtered_begin(OPT_include),
1515          ie = Args.filtered_end(); it != ie; ++it) {
1516     const Arg *A = *it;
1517     Opts.Includes.push_back(A->getValue());
1518   }
1519 
1520   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1521          ie = Args.filtered_end(); it != ie; ++it) {
1522     const Arg *A = *it;
1523     Opts.ChainedIncludes.push_back(A->getValue());
1524   }
1525 
1526   // Include 'altivec.h' if -faltivec option present
1527   if (Args.hasArg(OPT_faltivec))
1528     Opts.Includes.push_back("altivec.h");
1529 
1530   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1531          ie = Args.filtered_end(); it != ie; ++it) {
1532     const Arg *A = *it;
1533     std::pair<StringRef,StringRef> Split =
1534       StringRef(A->getValue()).split(';');
1535 
1536     if (Split.second.empty()) {
1537       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1538       continue;
1539     }
1540 
1541     Opts.addRemappedFile(Split.first, Split.second);
1542   }
1543 
1544   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1545     StringRef Name = A->getValue();
1546     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1547       .Case("libc++", ARCXX_libcxx)
1548       .Case("libstdc++", ARCXX_libstdcxx)
1549       .Case("none", ARCXX_nolib)
1550       .Default(~0U);
1551     if (Library == ~0U)
1552       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1553     else
1554       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1555   }
1556 }
1557 
1558 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1559                                         ArgList &Args,
1560                                         frontend::ActionKind Action) {
1561   using namespace options;
1562 
1563   switch (Action) {
1564   case frontend::ASTDeclList:
1565   case frontend::ASTDump:
1566   case frontend::ASTPrint:
1567   case frontend::ASTView:
1568   case frontend::EmitAssembly:
1569   case frontend::EmitBC:
1570   case frontend::EmitHTML:
1571   case frontend::EmitLLVM:
1572   case frontend::EmitLLVMOnly:
1573   case frontend::EmitCodeGenOnly:
1574   case frontend::EmitObj:
1575   case frontend::FixIt:
1576   case frontend::GenerateModule:
1577   case frontend::GeneratePCH:
1578   case frontend::GeneratePTH:
1579   case frontend::ParseSyntaxOnly:
1580   case frontend::ModuleFileInfo:
1581   case frontend::PluginAction:
1582   case frontend::PrintDeclContext:
1583   case frontend::RewriteObjC:
1584   case frontend::RewriteTest:
1585   case frontend::RunAnalysis:
1586   case frontend::MigrateSource:
1587     Opts.ShowCPP = 0;
1588     break;
1589 
1590   case frontend::DumpRawTokens:
1591   case frontend::DumpTokens:
1592   case frontend::InitOnly:
1593   case frontend::PrintPreamble:
1594   case frontend::PrintPreprocessedInput:
1595   case frontend::RewriteMacros:
1596   case frontend::RunPreprocessorOnly:
1597     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1598     break;
1599   }
1600 
1601   Opts.ShowComments = Args.hasArg(OPT_C);
1602   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1603   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1604   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1605   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1606 }
1607 
1608 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1609   using namespace options;
1610   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1611   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1612   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1613   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1614   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1615   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1616   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1617 
1618   // Use the default target triple if unspecified.
1619   if (Opts.Triple.empty())
1620     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1621 }
1622 
1623 //
1624 
1625 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1626                                         const char *const *ArgBegin,
1627                                         const char *const *ArgEnd,
1628                                         DiagnosticsEngine &Diags) {
1629   bool Success = true;
1630 
1631   // Parse the arguments.
1632   OwningPtr<OptTable> Opts(createDriverOptTable());
1633   const unsigned IncludedFlagsBitmask = options::CC1Option;
1634   unsigned MissingArgIndex, MissingArgCount;
1635   OwningPtr<InputArgList> Args(
1636     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1637                     IncludedFlagsBitmask));
1638 
1639   // Check for missing argument error.
1640   if (MissingArgCount) {
1641     Diags.Report(diag::err_drv_missing_argument)
1642       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1643     Success = false;
1644   }
1645 
1646   // Issue errors on unknown arguments.
1647   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1648          ie = Args->filtered_end(); it != ie; ++it) {
1649     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1650     Success = false;
1651   }
1652 
1653   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1654   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1655   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1656   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1657             && Success;
1658   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1659   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1660   // FIXME: We shouldn't have to pass the DashX option around here
1661   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1662   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1663             && Success;
1664   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1665   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1666     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1667     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1668       Res.getLangOpts()->ObjCExceptions = 1;
1669   }
1670   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1671   // PCH file and find the original header name. Remove the need to do that in
1672   // ParsePreprocessorArgs and remove the FileManager
1673   // parameters from the function and the "FileManager.h" #include.
1674   FileManager FileMgr(Res.getFileSystemOpts());
1675   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1676   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1677                               Res.getFrontendOpts().ProgramAction);
1678   ParseTargetArgs(Res.getTargetOpts(), *Args);
1679 
1680   return Success;
1681 }
1682 
1683 namespace {
1684 
1685   class ModuleSignature {
1686     SmallVector<uint64_t, 16> Data;
1687     unsigned CurBit;
1688     uint64_t CurValue;
1689 
1690   public:
1691     ModuleSignature() : CurBit(0), CurValue(0) { }
1692 
1693     void add(uint64_t Value, unsigned Bits);
1694     void add(StringRef Value);
1695     void flush();
1696 
1697     llvm::APInt getAsInteger() const;
1698   };
1699 }
1700 
1701 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1702   CurValue |= Value << CurBit;
1703   if (CurBit + NumBits < 64) {
1704     CurBit += NumBits;
1705     return;
1706   }
1707 
1708   // Add the current word.
1709   Data.push_back(CurValue);
1710 
1711   if (CurBit)
1712     CurValue = Value >> (64-CurBit);
1713   else
1714     CurValue = 0;
1715   CurBit = (CurBit+NumBits) & 63;
1716 }
1717 
1718 void ModuleSignature::flush() {
1719   if (CurBit == 0)
1720     return;
1721 
1722   Data.push_back(CurValue);
1723   CurBit = 0;
1724   CurValue = 0;
1725 }
1726 
1727 void ModuleSignature::add(StringRef Value) {
1728   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1729     add(*I, 8);
1730 }
1731 
1732 llvm::APInt ModuleSignature::getAsInteger() const {
1733   return llvm::APInt(Data.size() * 64, Data);
1734 }
1735 
1736 std::string CompilerInvocation::getModuleHash() const {
1737   // Note: For QoI reasons, the things we use as a hash here should all be
1738   // dumped via the -module-info flag.
1739   using llvm::hash_code;
1740   using llvm::hash_value;
1741   using llvm::hash_combine;
1742 
1743   // Start the signature with the compiler version.
1744   // FIXME: We'd rather use something more cryptographically sound than
1745   // CityHash, but this will do for now.
1746   hash_code code = hash_value(getClangFullRepositoryVersion());
1747 
1748   // Extend the signature with the language options
1749 #define LANGOPT(Name, Bits, Default, Description) \
1750    code = hash_combine(code, LangOpts->Name);
1751 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1752   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1753 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1754 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1755 #include "clang/Basic/LangOptions.def"
1756 
1757   // Extend the signature with the target options.
1758   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1759                       TargetOpts->ABI, TargetOpts->CXXABI,
1760                       TargetOpts->LinkerVersion);
1761   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1762     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1763 
1764   // Extend the signature with preprocessor options.
1765   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1766   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1767   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1768 
1769   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1770             I = getPreprocessorOpts().Macros.begin(),
1771          IEnd = getPreprocessorOpts().Macros.end();
1772        I != IEnd; ++I) {
1773     // If we're supposed to ignore this macro for the purposes of modules,
1774     // don't put it into the hash.
1775     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1776       // Check whether we're ignoring this macro.
1777       StringRef MacroDef = I->first;
1778       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1779         continue;
1780     }
1781 
1782     code = hash_combine(code, I->first, I->second);
1783   }
1784 
1785   // Extend the signature with the sysroot.
1786   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1787                       hsOpts.UseStandardSystemIncludes,
1788                       hsOpts.UseStandardCXXIncludes,
1789                       hsOpts.UseLibcxx);
1790 
1791   // Darwin-specific hack: if we have a sysroot, use the contents and
1792   // modification time of
1793   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1794   // as part of the module hash.
1795   if (!hsOpts.Sysroot.empty()) {
1796     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1797     SmallString<128> systemVersionFile;
1798     systemVersionFile += hsOpts.Sysroot;
1799     llvm::sys::path::append(systemVersionFile, "System");
1800     llvm::sys::path::append(systemVersionFile, "Library");
1801     llvm::sys::path::append(systemVersionFile, "CoreServices");
1802     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1803     if (!llvm::MemoryBuffer::getFile(systemVersionFile.str(), buffer)) {
1804       code = hash_combine(code, buffer.get()->getBuffer());
1805 
1806       struct stat statBuf;
1807       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1808         code = hash_combine(code, statBuf.st_mtime);
1809     }
1810   }
1811 
1812   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1813 }
1814 
1815 namespace clang {
1816 
1817 // Declared in clang/Frontend/Utils.h.
1818 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1819                        DiagnosticsEngine *Diags) {
1820   int Res = Default;
1821   if (Arg *A = Args.getLastArg(Id)) {
1822     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1823       if (Diags)
1824         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1825                                                        << A->getValue();
1826     }
1827   }
1828   return Res;
1829 }
1830 }
1831