xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision f5d9d348f7b362c09c0a14160c2c8a5517f717ea) 
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   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
303   if (OptLevel > 3) {
304     Diags.Report(diag::err_drv_invalid_value)
305       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
306     OptLevel = 3;
307     Success = false;
308   }
309   Opts.OptimizationLevel = OptLevel;
310 
311   // We must always run at least the always inlining pass.
312   Opts.setInlining(
313     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
314                                  : CodeGenOptions::OnlyAlwaysInlining);
315   // -fno-inline-functions overrides OptimizationLevel > 1.
316   Opts.NoInline = Args.hasArg(OPT_fno_inline);
317   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
318                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
319 
320   if (Args.hasArg(OPT_gline_tables_only)) {
321     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
322   } else if (Args.hasArg(OPT_g_Flag) || Args.hasArg(OPT_gdwarf_2) ||
323              Args.hasArg(OPT_gdwarf_3) || Args.hasArg(OPT_gdwarf_4)) {
324     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
325       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
326     else
327       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
328   }
329   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
330   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
331   if (Args.hasArg(OPT_gdwarf_2))
332     Opts.DwarfVersion = 2;
333   else if (Args.hasArg(OPT_gdwarf_3))
334     Opts.DwarfVersion = 3;
335   else if (Args.hasArg(OPT_gdwarf_4))
336     Opts.DwarfVersion = 4;
337   else if (Opts.getDebugInfo() != CodeGenOptions::NoDebugInfo)
338     // Default Dwarf version is 4 if we are generating debug information.
339     Opts.DwarfVersion = 4;
340 
341   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
342   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
343   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
344   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
345     OPT_fuse_register_sized_bitfield_access);
346   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
347   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
348   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
349   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
350   Opts.NoCommon = Args.hasArg(OPT_fno_common);
351   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
352   Opts.OptimizeSize = getOptimizationLevelSize(Args);
353   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
354                             Args.hasArg(OPT_ffreestanding));
355   Opts.UnrollLoops =
356       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
357                    (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize));
358 
359   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
360   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
361   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
362   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
363   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
364   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
365   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
366   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
367   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
368   Opts.DisableFree = Args.hasArg(OPT_disable_free);
369   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
370   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
371   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
372   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
373   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
374   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
375                        Args.hasArg(OPT_cl_finite_math_only)||
376                        Args.hasArg(OPT_cl_fast_relaxed_math));
377   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
378                        Args.hasArg(OPT_cl_finite_math_only)||
379                        Args.hasArg(OPT_cl_fast_relaxed_math));
380   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
381   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
382   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
383   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
384   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
385   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
386   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
387   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
388   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
389   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
390   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
391   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
392   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
393   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
394                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
395                       Args.hasArg(OPT_cl_fast_relaxed_math);
396   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
397   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
398   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
399   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
400 
401   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
402                                        OPT_fno_function_sections, false);
403   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
404                                    OPT_fno_data_sections, false);
405 
406   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
407   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
408   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
409 
410   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
411   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
412   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
413 
414   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
415   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
416   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
417   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
418   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
419     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
420     Opts.CoverageNoFunctionNamesInData =
421         Args.hasArg(OPT_coverage_no_function_names_in_data);
422     if (Args.hasArg(OPT_coverage_version_EQ)) {
423       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
424       if (CoverageVersion.size() != 4) {
425         Diags.Report(diag::err_drv_invalid_value)
426             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
427             << CoverageVersion;
428       } else {
429         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
430       }
431     }
432   }
433 
434   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
435   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
436   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
437   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
438   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
439   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
440   Opts.SanitizeMemoryTrackOrigins =
441     Args.hasArg(OPT_fsanitize_memory_track_origins);
442   Opts.SanitizeAddressZeroBaseShadow =
443     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
444   Opts.SanitizeUndefinedTrapOnError =
445     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
446   Opts.SSPBufferSize =
447       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
448   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
449   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
450     StringRef Val = A->getValue();
451     unsigned StackAlignment = Opts.StackAlignment;
452     Val.getAsInteger(10, StackAlignment);
453     Opts.StackAlignment = StackAlignment;
454   }
455 
456   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
457     StringRef Name = A->getValue();
458     unsigned Method = llvm::StringSwitch<unsigned>(Name)
459       .Case("legacy", CodeGenOptions::Legacy)
460       .Case("non-legacy", CodeGenOptions::NonLegacy)
461       .Case("mixed", CodeGenOptions::Mixed)
462       .Default(~0U);
463     if (Method == ~0U) {
464       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
465       Success = false;
466     } else {
467       Opts.setObjCDispatchMethod(
468         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
469     }
470   }
471 
472   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
473     StringRef Name = A->getValue();
474     unsigned Model = llvm::StringSwitch<unsigned>(Name)
475         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
476         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
477         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
478         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
479         .Default(~0U);
480     if (Model == ~0U) {
481       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
482       Success = false;
483     } else {
484       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
485     }
486   }
487 
488   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
489     StringRef Val = A->getValue();
490     if (Val == "fast")
491       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
492     else if (Val == "on")
493       Opts.setFPContractMode(CodeGenOptions::FPC_On);
494     else if (Val == "off")
495       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
496     else
497       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
498   }
499 
500   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
501     if (A->getOption().matches(OPT_fpcc_struct_return)) {
502       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
503     } else {
504       assert(A->getOption().matches(OPT_freg_struct_return));
505       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
506     }
507   }
508 
509   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
510 
511   return Success;
512 }
513 
514 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
515                                       ArgList &Args) {
516   using namespace options;
517   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
518   Opts.Targets = Args.getAllArgValues(OPT_MT);
519   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
520   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
521   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
522   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
523   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
524   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
525   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
526 }
527 
528 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
529                                 DiagnosticsEngine *Diags) {
530   using namespace options;
531   bool Success = true;
532 
533   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
534   Opts.DiagnosticSerializationFile =
535     Args.getLastArgValue(OPT_diagnostic_serialized_file);
536   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
537   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
538   Opts.Pedantic = Args.hasArg(OPT_pedantic);
539   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
540   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
541   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
542   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
543                                  OPT_fno_show_column,
544                                  /*Default=*/true);
545   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
546   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
547   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
548 
549   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
550 
551   // Default behavior is to not to show note include stacks.
552   Opts.ShowNoteIncludeStack = false;
553   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
554                                OPT_fno_diagnostics_show_note_include_stack))
555     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
556       Opts.ShowNoteIncludeStack = true;
557 
558   StringRef ShowOverloads =
559     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
560   if (ShowOverloads == "best")
561     Opts.setShowOverloads(Ovl_Best);
562   else if (ShowOverloads == "all")
563     Opts.setShowOverloads(Ovl_All);
564   else {
565     Success = false;
566     if (Diags)
567       Diags->Report(diag::err_drv_invalid_value)
568       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
569       << ShowOverloads;
570   }
571 
572   StringRef ShowCategory =
573     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
574   if (ShowCategory == "none")
575     Opts.ShowCategories = 0;
576   else if (ShowCategory == "id")
577     Opts.ShowCategories = 1;
578   else if (ShowCategory == "name")
579     Opts.ShowCategories = 2;
580   else {
581     Success = false;
582     if (Diags)
583       Diags->Report(diag::err_drv_invalid_value)
584       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
585       << ShowCategory;
586   }
587 
588   StringRef Format =
589     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
590   if (Format == "clang")
591     Opts.setFormat(DiagnosticOptions::Clang);
592   else if (Format == "msvc")
593     Opts.setFormat(DiagnosticOptions::Msvc);
594   else if (Format == "msvc-fallback") {
595     Opts.setFormat(DiagnosticOptions::Msvc);
596     Opts.CLFallbackMode = true;
597   } else if (Format == "vi")
598     Opts.setFormat(DiagnosticOptions::Vi);
599   else {
600     Success = false;
601     if (Diags)
602       Diags->Report(diag::err_drv_invalid_value)
603       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
604       << Format;
605   }
606 
607   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
608   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
609   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
610   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
611   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
612   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
613   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
614   Opts.MacroBacktraceLimit =
615       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
616                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
617   Opts.TemplateBacktraceLimit = getLastArgIntValue(
618       Args, OPT_ftemplate_backtrace_limit,
619       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
620   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
621       Args, OPT_fconstexpr_backtrace_limit,
622       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
623   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
624                                     DiagnosticOptions::DefaultTabStop, Diags);
625   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
626     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
627     if (Diags)
628       Diags->Report(diag::warn_ignoring_ftabstop_value)
629       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
630   }
631   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
632   addWarningArgs(Args, Opts.Warnings);
633 
634   return Success;
635 }
636 
637 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
638   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
639 }
640 
641 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
642                                    DiagnosticsEngine &Diags) {
643   using namespace options;
644   Opts.ProgramAction = frontend::ParseSyntaxOnly;
645   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
646     switch (A->getOption().getID()) {
647     default:
648       llvm_unreachable("Invalid option in group!");
649     case OPT_ast_list:
650       Opts.ProgramAction = frontend::ASTDeclList; break;
651     case OPT_ast_dump:
652       Opts.ProgramAction = frontend::ASTDump; break;
653     case OPT_ast_print:
654       Opts.ProgramAction = frontend::ASTPrint; break;
655     case OPT_ast_view:
656       Opts.ProgramAction = frontend::ASTView; break;
657     case OPT_dump_raw_tokens:
658       Opts.ProgramAction = frontend::DumpRawTokens; break;
659     case OPT_dump_tokens:
660       Opts.ProgramAction = frontend::DumpTokens; break;
661     case OPT_S:
662       Opts.ProgramAction = frontend::EmitAssembly; break;
663     case OPT_emit_llvm_bc:
664       Opts.ProgramAction = frontend::EmitBC; break;
665     case OPT_emit_html:
666       Opts.ProgramAction = frontend::EmitHTML; break;
667     case OPT_emit_llvm:
668       Opts.ProgramAction = frontend::EmitLLVM; break;
669     case OPT_emit_llvm_only:
670       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
671     case OPT_emit_codegen_only:
672       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
673     case OPT_emit_obj:
674       Opts.ProgramAction = frontend::EmitObj; break;
675     case OPT_fixit_EQ:
676       Opts.FixItSuffix = A->getValue();
677       // fall-through!
678     case OPT_fixit:
679       Opts.ProgramAction = frontend::FixIt; break;
680     case OPT_emit_module:
681       Opts.ProgramAction = frontend::GenerateModule; break;
682     case OPT_emit_pch:
683       Opts.ProgramAction = frontend::GeneratePCH; break;
684     case OPT_emit_pth:
685       Opts.ProgramAction = frontend::GeneratePTH; break;
686     case OPT_init_only:
687       Opts.ProgramAction = frontend::InitOnly; break;
688     case OPT_fsyntax_only:
689       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
690     case OPT_module_file_info:
691       Opts.ProgramAction = frontend::ModuleFileInfo; break;
692     case OPT_print_decl_contexts:
693       Opts.ProgramAction = frontend::PrintDeclContext; break;
694     case OPT_print_preamble:
695       Opts.ProgramAction = frontend::PrintPreamble; break;
696     case OPT_E:
697       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
698     case OPT_rewrite_macros:
699       Opts.ProgramAction = frontend::RewriteMacros; break;
700     case OPT_rewrite_objc:
701       Opts.ProgramAction = frontend::RewriteObjC; break;
702     case OPT_rewrite_test:
703       Opts.ProgramAction = frontend::RewriteTest; break;
704     case OPT_analyze:
705       Opts.ProgramAction = frontend::RunAnalysis; break;
706     case OPT_migrate:
707       Opts.ProgramAction = frontend::MigrateSource; break;
708     case OPT_Eonly:
709       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
710     }
711   }
712 
713   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
714     Opts.Plugins.push_back(A->getValue(0));
715     Opts.ProgramAction = frontend::PluginAction;
716     Opts.ActionName = A->getValue();
717 
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.ActionName)
721         Opts.PluginArgs.push_back((*it)->getValue(1));
722     }
723   }
724 
725   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
726   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
727   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
728     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
729            end = Args.filtered_end(); it != end; ++it) {
730       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
731         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
732     }
733   }
734 
735   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
736     Opts.CodeCompletionAt =
737       ParsedSourceLocation::FromString(A->getValue());
738     if (Opts.CodeCompletionAt.FileName.empty())
739       Diags.Report(diag::err_drv_invalid_value)
740         << A->getAsString(Args) << A->getValue();
741   }
742   Opts.DisableFree = Args.hasArg(OPT_disable_free);
743 
744   Opts.OutputFile = Args.getLastArgValue(OPT_o);
745   Opts.Plugins = Args.getAllArgValues(OPT_load);
746   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
747   Opts.ShowHelp = Args.hasArg(OPT_help);
748   Opts.ShowStats = Args.hasArg(OPT_print_stats);
749   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
750   Opts.ShowVersion = Args.hasArg(OPT_version);
751   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
752   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
753   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
754   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
755   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
756   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
757   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
758   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
759   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
760   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
761 
762   Opts.CodeCompleteOpts.IncludeMacros
763     = Args.hasArg(OPT_code_completion_macros);
764   Opts.CodeCompleteOpts.IncludeCodePatterns
765     = Args.hasArg(OPT_code_completion_patterns);
766   Opts.CodeCompleteOpts.IncludeGlobals
767     = !Args.hasArg(OPT_no_code_completion_globals);
768   Opts.CodeCompleteOpts.IncludeBriefComments
769     = Args.hasArg(OPT_code_completion_brief_comments);
770 
771   Opts.OverrideRecordLayoutsFile
772     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
773   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
774                                      OPT_arcmt_modify,
775                                      OPT_arcmt_migrate)) {
776     switch (A->getOption().getID()) {
777     default:
778       llvm_unreachable("missed a case");
779     case OPT_arcmt_check:
780       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
781       break;
782     case OPT_arcmt_modify:
783       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
784       break;
785     case OPT_arcmt_migrate:
786       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
787       break;
788     }
789   }
790   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
791   Opts.ARCMTMigrateReportOut
792     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
793   Opts.ARCMTMigrateEmitARCErrors
794     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
795 
796   if (Args.hasArg(OPT_objcmt_migrate_literals))
797     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
798   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
799     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
800   if (Args.hasArg(OPT_objcmt_migrate_property))
801     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
802   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
803     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
804   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
805     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
806   if (Args.hasArg(OPT_objcmt_migrate_annotation))
807     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
808   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
809     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
810   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
811     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
812   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
813     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
814   if (Args.hasArg(OPT_objcmt_atomic_property))
815     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
816   if (Args.hasArg(OPT_objcmt_migrate_all))
817     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
818 
819   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
820       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
821     Diags.Report(diag::err_drv_argument_not_allowed_with)
822       << "ARC migration" << "ObjC migration";
823   }
824 
825   InputKind DashX = IK_None;
826   if (const Arg *A = Args.getLastArg(OPT_x)) {
827     DashX = llvm::StringSwitch<InputKind>(A->getValue())
828       .Case("c", IK_C)
829       .Case("cl", IK_OpenCL)
830       .Case("cuda", IK_CUDA)
831       .Case("c++", IK_CXX)
832       .Case("objective-c", IK_ObjC)
833       .Case("objective-c++", IK_ObjCXX)
834       .Case("cpp-output", IK_PreprocessedC)
835       .Case("assembler-with-cpp", IK_Asm)
836       .Case("c++-cpp-output", IK_PreprocessedCXX)
837       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
838       .Case("objc-cpp-output", IK_PreprocessedObjC)
839       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
840       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
841       .Case("c-header", IK_C)
842       .Case("cl-header", IK_OpenCL)
843       .Case("objective-c-header", IK_ObjC)
844       .Case("c++-header", IK_CXX)
845       .Case("objective-c++-header", IK_ObjCXX)
846       .Cases("ast", "pcm", IK_AST)
847       .Case("ir", IK_LLVM_IR)
848       .Default(IK_None);
849     if (DashX == IK_None)
850       Diags.Report(diag::err_drv_invalid_value)
851         << A->getAsString(Args) << A->getValue();
852   }
853 
854   // '-' is the default input if none is given.
855   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
856   Opts.Inputs.clear();
857   if (Inputs.empty())
858     Inputs.push_back("-");
859   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
860     InputKind IK = DashX;
861     if (IK == IK_None) {
862       IK = FrontendOptions::getInputKindForExtension(
863         StringRef(Inputs[i]).rsplit('.').second);
864       // FIXME: Remove this hack.
865       if (i == 0)
866         DashX = IK;
867     }
868     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
869   }
870 
871   return DashX;
872 }
873 
874 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
875                                                  void *MainAddr) {
876   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
877 
878   if (!P.empty()) {
879     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
880     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
881 
882     // Get foo/lib/clang/<version>/include
883     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
884   }
885 
886   return P.str();
887 }
888 
889 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
890   using namespace options;
891   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
892   Opts.Verbose = Args.hasArg(OPT_v);
893   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
894   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
895   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
896   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
897     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
898   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
899   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
900   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
901   // -fmodules implies -fmodule-maps
902   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
903   Opts.ModuleCachePruneInterval =
904       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
905   Opts.ModuleCachePruneAfter =
906       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
907   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
908                     ie = Args.filtered_end();
909        it != ie; ++it) {
910     StringRef MacroDef = (*it)->getValue();
911     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
912   }
913   std::vector<std::string> ModuleMapFiles =
914       Args.getAllArgValues(OPT_fmodule_map_file);
915   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
916 
917   // Add -I..., -F..., and -index-header-map options in order.
918   bool IsIndexHeaderMap = false;
919   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
920                                              OPT_index_header_map),
921        ie = Args.filtered_end(); it != ie; ++it) {
922     if ((*it)->getOption().matches(OPT_index_header_map)) {
923       // -index-header-map applies to the next -I or -F.
924       IsIndexHeaderMap = true;
925       continue;
926     }
927 
928     frontend::IncludeDirGroup Group
929       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
930 
931     Opts.AddPath((*it)->getValue(), Group,
932                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
933     IsIndexHeaderMap = false;
934   }
935 
936   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
937   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
938   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
939                                              OPT_iwithprefixbefore),
940          ie = Args.filtered_end(); it != ie; ++it) {
941     const Arg *A = *it;
942     if (A->getOption().matches(OPT_iprefix))
943       Prefix = A->getValue();
944     else if (A->getOption().matches(OPT_iwithprefix))
945       Opts.AddPath(Prefix.str() + A->getValue(),
946                    frontend::After, false, true);
947     else
948       Opts.AddPath(Prefix.str() + A->getValue(),
949                    frontend::Angled, false, true);
950   }
951 
952   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
953          ie = Args.filtered_end(); it != ie; ++it)
954     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
955   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
956          ie = Args.filtered_end(); it != ie; ++it)
957     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
958   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
959          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
960     Opts.AddPath((*it)->getValue(), frontend::System, false,
961                  !(*it)->getOption().matches(OPT_iwithsysroot));
962   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
963          ie = Args.filtered_end(); it != ie; ++it)
964     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
965 
966   // Add the paths for the various language specific isystem flags.
967   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
968        ie = Args.filtered_end(); it != ie; ++it)
969     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
970   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
971        ie = Args.filtered_end(); it != ie; ++it)
972     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
973   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
974        ie = Args.filtered_end(); it != ie; ++it)
975     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
976   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
977        ie = Args.filtered_end(); it != ie; ++it)
978     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
979 
980   // Add the internal paths from a driver that detects standard include paths.
981   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
982                                             OPT_internal_externc_isystem),
983                     E = Args.filtered_end();
984        I != E; ++I) {
985     frontend::IncludeDirGroup Group = frontend::System;
986     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
987       Group = frontend::ExternCSystem;
988     Opts.AddPath((*I)->getValue(), Group, false, true);
989   }
990 
991   // Add the path prefixes which are implicitly treated as being system headers.
992   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
993                                             OPT_ino_system_prefix),
994                     E = Args.filtered_end();
995        I != E; ++I)
996     Opts.AddSystemHeaderPrefix((*I)->getValue(),
997                                (*I)->getOption().matches(OPT_isystem_prefix));
998 }
999 
1000 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1001                                          LangStandard::Kind LangStd) {
1002   // Set some properties which depend solely on the input kind; it would be nice
1003   // to move these to the language standard, and have the driver resolve the
1004   // input kind + language standard.
1005   if (IK == IK_Asm) {
1006     Opts.AsmPreprocessor = 1;
1007   } else if (IK == IK_ObjC ||
1008              IK == IK_ObjCXX ||
1009              IK == IK_PreprocessedObjC ||
1010              IK == IK_PreprocessedObjCXX) {
1011     Opts.ObjC1 = Opts.ObjC2 = 1;
1012   }
1013 
1014   if (LangStd == LangStandard::lang_unspecified) {
1015     // Based on the base language, pick one.
1016     switch (IK) {
1017     case IK_None:
1018     case IK_AST:
1019     case IK_LLVM_IR:
1020       llvm_unreachable("Invalid input kind!");
1021     case IK_OpenCL:
1022       LangStd = LangStandard::lang_opencl;
1023       break;
1024     case IK_CUDA:
1025       LangStd = LangStandard::lang_cuda;
1026       break;
1027     case IK_Asm:
1028     case IK_C:
1029     case IK_PreprocessedC:
1030     case IK_ObjC:
1031     case IK_PreprocessedObjC:
1032       LangStd = LangStandard::lang_gnu99;
1033       break;
1034     case IK_CXX:
1035     case IK_PreprocessedCXX:
1036     case IK_ObjCXX:
1037     case IK_PreprocessedObjCXX:
1038       LangStd = LangStandard::lang_gnucxx98;
1039       break;
1040     }
1041   }
1042 
1043   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1044   Opts.LineComment = Std.hasLineComments();
1045   Opts.C99 = Std.isC99();
1046   Opts.C11 = Std.isC11();
1047   Opts.CPlusPlus = Std.isCPlusPlus();
1048   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1049   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1050   Opts.Digraphs = Std.hasDigraphs();
1051   Opts.GNUMode = Std.isGNUMode();
1052   Opts.GNUInline = !Std.isC99();
1053   Opts.HexFloats = Std.hasHexFloats();
1054   Opts.ImplicitInt = Std.hasImplicitInt();
1055 
1056   // Set OpenCL Version.
1057   if (LangStd == LangStandard::lang_opencl) {
1058     Opts.OpenCL = 1;
1059     Opts.OpenCLVersion = 100;
1060   }
1061   else if (LangStd == LangStandard::lang_opencl11) {
1062       Opts.OpenCL = 1;
1063       Opts.OpenCLVersion = 110;
1064   }
1065   else if (LangStd == LangStandard::lang_opencl12) {
1066     Opts.OpenCL = 1;
1067     Opts.OpenCLVersion = 120;
1068   }
1069 
1070   // OpenCL has some additional defaults.
1071   if (Opts.OpenCL) {
1072     Opts.AltiVec = 0;
1073     Opts.CXXOperatorNames = 1;
1074     Opts.LaxVectorConversions = 0;
1075     Opts.DefaultFPContract = 1;
1076     Opts.NativeHalfType = 1;
1077   }
1078 
1079   if (LangStd == LangStandard::lang_cuda)
1080     Opts.CUDA = 1;
1081 
1082   // OpenCL and C++ both have bool, true, false keywords.
1083   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1084 
1085   // C++ has wchar_t keyword.
1086   Opts.WChar = Opts.CPlusPlus;
1087 
1088   Opts.GNUKeywords = Opts.GNUMode;
1089   Opts.CXXOperatorNames = Opts.CPlusPlus;
1090 
1091   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1092   // is specified, or -std is set to a conforming mode.
1093   Opts.Trigraphs = !Opts.GNUMode;
1094 
1095   Opts.DollarIdents = !Opts.AsmPreprocessor;
1096 }
1097 
1098 /// Attempt to parse a visibility value out of the given argument.
1099 static Visibility parseVisibility(Arg *arg, ArgList &args,
1100                                   DiagnosticsEngine &diags) {
1101   StringRef value = arg->getValue();
1102   if (value == "default") {
1103     return DefaultVisibility;
1104   } else if (value == "hidden") {
1105     return HiddenVisibility;
1106   } else if (value == "protected") {
1107     // FIXME: diagnose if target does not support protected visibility
1108     return ProtectedVisibility;
1109   }
1110 
1111   diags.Report(diag::err_drv_invalid_value)
1112     << arg->getAsString(args) << value;
1113   return DefaultVisibility;
1114 }
1115 
1116 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1117                           DiagnosticsEngine &Diags) {
1118   // FIXME: Cleanup per-file based stuff.
1119   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1120   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1121     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1122 #define LANGSTANDARD(id, name, desc, features) \
1123       .Case(name, LangStandard::lang_##id)
1124 #include "clang/Frontend/LangStandards.def"
1125       .Default(LangStandard::lang_unspecified);
1126     if (LangStd == LangStandard::lang_unspecified)
1127       Diags.Report(diag::err_drv_invalid_value)
1128         << A->getAsString(Args) << A->getValue();
1129     else {
1130       // Valid standard, check to make sure language and standard are compatable.
1131       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1132       switch (IK) {
1133       case IK_C:
1134       case IK_ObjC:
1135       case IK_PreprocessedC:
1136       case IK_PreprocessedObjC:
1137         if (!(Std.isC89() || Std.isC99()))
1138           Diags.Report(diag::err_drv_argument_not_allowed_with)
1139             << A->getAsString(Args) << "C/ObjC";
1140         break;
1141       case IK_CXX:
1142       case IK_ObjCXX:
1143       case IK_PreprocessedCXX:
1144       case IK_PreprocessedObjCXX:
1145         if (!Std.isCPlusPlus())
1146           Diags.Report(diag::err_drv_argument_not_allowed_with)
1147             << A->getAsString(Args) << "C++/ObjC++";
1148         break;
1149       case IK_OpenCL:
1150         if (!Std.isC99())
1151           Diags.Report(diag::err_drv_argument_not_allowed_with)
1152             << A->getAsString(Args) << "OpenCL";
1153         break;
1154       case IK_CUDA:
1155         if (!Std.isCPlusPlus())
1156           Diags.Report(diag::err_drv_argument_not_allowed_with)
1157             << A->getAsString(Args) << "CUDA";
1158         break;
1159       default:
1160         break;
1161       }
1162     }
1163   }
1164 
1165   // -cl-std only applies for OpenCL language standards.
1166   // Override the -std option in this case.
1167   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1168     LangStandard::Kind OpenCLLangStd
1169     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1170     .Case("CL", LangStandard::lang_opencl)
1171     .Case("CL1.1", LangStandard::lang_opencl11)
1172     .Case("CL1.2", LangStandard::lang_opencl12)
1173     .Default(LangStandard::lang_unspecified);
1174 
1175     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1176       Diags.Report(diag::err_drv_invalid_value)
1177       << A->getAsString(Args) << A->getValue();
1178     }
1179     else
1180       LangStd = OpenCLLangStd;
1181   }
1182 
1183   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1184 
1185   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1186   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1187   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1188   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1189   // name, as it doesn't seem a useful distinction.
1190   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1191                                   Opts.GNUKeywords);
1192 
1193   if (Args.hasArg(OPT_fno_operator_names))
1194     Opts.CXXOperatorNames = 0;
1195 
1196   if (Opts.ObjC1) {
1197     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1198       StringRef value = arg->getValue();
1199       if (Opts.ObjCRuntime.tryParse(value))
1200         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1201     }
1202 
1203     if (Args.hasArg(OPT_fobjc_gc_only))
1204       Opts.setGC(LangOptions::GCOnly);
1205     else if (Args.hasArg(OPT_fobjc_gc))
1206       Opts.setGC(LangOptions::HybridGC);
1207     else if (Args.hasArg(OPT_fobjc_arc)) {
1208       Opts.ObjCAutoRefCount = 1;
1209       if (!Opts.ObjCRuntime.allowsARC())
1210         Diags.Report(diag::err_arc_unsupported_on_runtime);
1211 
1212       // Only set ObjCARCWeak if ARC is enabled.
1213       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1214         Opts.ObjCARCWeak = 1;
1215       else
1216         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1217     }
1218 
1219     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1220       Opts.ObjCInferRelatedResultType = 0;
1221   }
1222 
1223   if (Args.hasArg(OPT_fgnu89_inline))
1224     Opts.GNUInline = 1;
1225 
1226   if (Args.hasArg(OPT_fapple_kext)) {
1227     if (!Opts.CPlusPlus)
1228       Diags.Report(diag::warn_c_kext);
1229     else
1230       Opts.AppleKext = 1;
1231   }
1232 
1233   if (Args.hasArg(OPT_print_ivar_layout))
1234     Opts.ObjCGCBitmapPrint = 1;
1235   if (Args.hasArg(OPT_fno_constant_cfstrings))
1236     Opts.NoConstantCFStrings = 1;
1237 
1238   if (Args.hasArg(OPT_faltivec))
1239     Opts.AltiVec = 1;
1240 
1241   if (Args.hasArg(OPT_pthread))
1242     Opts.POSIXThreads = 1;
1243 
1244   // The value-visibility mode defaults to "default".
1245   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1246     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1247   } else {
1248     Opts.setValueVisibilityMode(DefaultVisibility);
1249   }
1250 
1251   // The type-visibility mode defaults to the value-visibility mode.
1252   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1253     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1254   } else {
1255     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1256   }
1257 
1258   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1259     Opts.InlineVisibilityHidden = 1;
1260 
1261   if (Args.hasArg(OPT_ftrapv)) {
1262     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1263     // Set the handler, if one is specified.
1264     Opts.OverflowHandler =
1265         Args.getLastArgValue(OPT_ftrapv_handler);
1266   }
1267   else if (Args.hasArg(OPT_fwrapv))
1268     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1269 
1270   if (Args.hasArg(OPT_trigraphs))
1271     Opts.Trigraphs = 1;
1272 
1273   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1274                                    OPT_fno_dollars_in_identifiers,
1275                                    Opts.DollarIdents);
1276   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1277   Opts.MicrosoftExt
1278     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1279   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1280   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1281   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1282   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1283   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1284   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1285                                    Opts.ConstStrings);
1286   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1287     Opts.LaxVectorConversions = 0;
1288   if (Args.hasArg(OPT_fno_threadsafe_statics))
1289     Opts.ThreadsafeStatics = 0;
1290   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1291   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1292   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1293   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1294   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1295 
1296   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1297   Opts.Blocks = Args.hasArg(OPT_fblocks);
1298   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1299   Opts.Modules = Args.hasArg(OPT_fmodules);
1300   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1301   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1302   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1303   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1304   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1305   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1306   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1307   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1308   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1309   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1310   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1311   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1312   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1313   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1314   Opts.InstantiationDepth =
1315       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1316   Opts.ConstexprCallDepth =
1317       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1318   Opts.ConstexprStepLimit =
1319       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1320   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1321   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1322   Opts.NumLargeByValueCopy =
1323       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1324   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1325   Opts.ObjCConstantStringClass =
1326     Args.getLastArgValue(OPT_fconstant_string_class);
1327   Opts.ObjCDefaultSynthProperties =
1328     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1329   Opts.EncodeExtendedBlockSig =
1330     Args.hasArg(OPT_fencode_extended_block_signature);
1331   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1332   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1333   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1334   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1335   Opts.Static = Args.hasArg(OPT_static_define);
1336   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1337   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1338                         || Args.hasArg(OPT_fdump_record_layouts);
1339   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1340   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1341   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1342   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1343   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1344   Opts.MRTD = Args.hasArg(OPT_mrtd);
1345   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1346   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1347   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1348   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1349   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1350   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1351   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1352   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1353 
1354   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1355     switch (llvm::StringSwitch<unsigned>(A->getValue())
1356       .Case("target", LangOptions::ASMM_Target)
1357       .Case("no", LangOptions::ASMM_Off)
1358       .Case("yes", LangOptions::ASMM_On)
1359       .Default(255)) {
1360     default:
1361       Diags.Report(diag::err_drv_invalid_value)
1362         << "-faddress-space-map-mangling=" << A->getValue();
1363       break;
1364     case LangOptions::ASMM_Target:
1365       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1366       break;
1367     case LangOptions::ASMM_On:
1368       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1369       break;
1370     case LangOptions::ASMM_Off:
1371       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1372       break;
1373     }
1374   }
1375 
1376   // Check if -fopenmp is specified.
1377   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1378 
1379   // Record whether the __DEPRECATED define was requested.
1380   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1381                                  OPT_fno_deprecated_macro,
1382                                  Opts.Deprecated);
1383 
1384   // FIXME: Eliminate this dependency.
1385   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1386        OptSize = getOptimizationLevelSize(Args);
1387   Opts.Optimize = Opt != 0;
1388   Opts.OptimizeSize = OptSize != 0;
1389 
1390   // This is the __NO_INLINE__ define, which just depends on things like the
1391   // optimization level and -fno-inline, not actually whether the backend has
1392   // inlining enabled.
1393   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1394 
1395   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1396   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1397 
1398   Opts.RetainCommentsFromSystemHeaders =
1399       Args.hasArg(OPT_fretain_comments_from_system_headers);
1400 
1401   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1402   switch (SSP) {
1403   default:
1404     Diags.Report(diag::err_drv_invalid_value)
1405       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1406     break;
1407   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1408   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1409   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1410   }
1411 
1412   // Parse -fsanitize= arguments.
1413   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1414   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1415     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1416     // efficiently map string values to them. Perform the mapping indirectly:
1417     // convert strings to enumerated values, then switch over the enum to set
1418     // the right bitfield value.
1419     enum Sanitizer {
1420 #define SANITIZER(NAME, ID) \
1421       ID,
1422 #include "clang/Basic/Sanitizers.def"
1423       Unknown
1424     };
1425     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1426 #define SANITIZER(NAME, ID) \
1427               .Case(NAME, ID)
1428 #include "clang/Basic/Sanitizers.def"
1429               .Default(Unknown)) {
1430 #define SANITIZER(NAME, ID) \
1431     case ID: \
1432       Opts.Sanitize.ID = true; \
1433       break;
1434 #include "clang/Basic/Sanitizers.def"
1435 
1436     case Unknown:
1437       Diags.Report(diag::err_drv_invalid_value)
1438         << "-fsanitize=" << Sanitizers[I];
1439       break;
1440     }
1441   }
1442 }
1443 
1444 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1445                                   FileManager &FileMgr,
1446                                   DiagnosticsEngine &Diags) {
1447   using namespace options;
1448   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1449   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1450   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1451       Opts.TokenCache = A->getValue();
1452   else
1453     Opts.TokenCache = Opts.ImplicitPTHInclude;
1454   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1455   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1456   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1457 
1458   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1459   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1460          ie = Args.filtered_end(); it != ie; ++it) {
1461     const Arg *A = *it;
1462     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1463   }
1464 
1465   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1466     StringRef Value(A->getValue());
1467     size_t Comma = Value.find(',');
1468     unsigned Bytes = 0;
1469     unsigned EndOfLine = 0;
1470 
1471     if (Comma == StringRef::npos ||
1472         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1473         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1474       Diags.Report(diag::err_drv_preamble_format);
1475     else {
1476       Opts.PrecompiledPreambleBytes.first = Bytes;
1477       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1478     }
1479   }
1480 
1481   // Add macros from the command line.
1482   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1483          ie = Args.filtered_end(); it != ie; ++it) {
1484     if ((*it)->getOption().matches(OPT_D))
1485       Opts.addMacroDef((*it)->getValue());
1486     else
1487       Opts.addMacroUndef((*it)->getValue());
1488   }
1489 
1490   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1491 
1492   // Add the ordered list of -includes.
1493   for (arg_iterator it = Args.filtered_begin(OPT_include),
1494          ie = Args.filtered_end(); it != ie; ++it) {
1495     const Arg *A = *it;
1496     Opts.Includes.push_back(A->getValue());
1497   }
1498 
1499   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1500          ie = Args.filtered_end(); it != ie; ++it) {
1501     const Arg *A = *it;
1502     Opts.ChainedIncludes.push_back(A->getValue());
1503   }
1504 
1505   // Include 'altivec.h' if -faltivec option present
1506   if (Args.hasArg(OPT_faltivec))
1507     Opts.Includes.push_back("altivec.h");
1508 
1509   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1510          ie = Args.filtered_end(); it != ie; ++it) {
1511     const Arg *A = *it;
1512     std::pair<StringRef,StringRef> Split =
1513       StringRef(A->getValue()).split(';');
1514 
1515     if (Split.second.empty()) {
1516       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1517       continue;
1518     }
1519 
1520     Opts.addRemappedFile(Split.first, Split.second);
1521   }
1522 
1523   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1524     StringRef Name = A->getValue();
1525     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1526       .Case("libc++", ARCXX_libcxx)
1527       .Case("libstdc++", ARCXX_libstdcxx)
1528       .Case("none", ARCXX_nolib)
1529       .Default(~0U);
1530     if (Library == ~0U)
1531       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1532     else
1533       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1534   }
1535 }
1536 
1537 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1538                                         ArgList &Args,
1539                                         frontend::ActionKind Action) {
1540   using namespace options;
1541 
1542   switch (Action) {
1543   case frontend::ASTDeclList:
1544   case frontend::ASTDump:
1545   case frontend::ASTPrint:
1546   case frontend::ASTView:
1547   case frontend::EmitAssembly:
1548   case frontend::EmitBC:
1549   case frontend::EmitHTML:
1550   case frontend::EmitLLVM:
1551   case frontend::EmitLLVMOnly:
1552   case frontend::EmitCodeGenOnly:
1553   case frontend::EmitObj:
1554   case frontend::FixIt:
1555   case frontend::GenerateModule:
1556   case frontend::GeneratePCH:
1557   case frontend::GeneratePTH:
1558   case frontend::ParseSyntaxOnly:
1559   case frontend::ModuleFileInfo:
1560   case frontend::PluginAction:
1561   case frontend::PrintDeclContext:
1562   case frontend::RewriteObjC:
1563   case frontend::RewriteTest:
1564   case frontend::RunAnalysis:
1565   case frontend::MigrateSource:
1566     Opts.ShowCPP = 0;
1567     break;
1568 
1569   case frontend::DumpRawTokens:
1570   case frontend::DumpTokens:
1571   case frontend::InitOnly:
1572   case frontend::PrintPreamble:
1573   case frontend::PrintPreprocessedInput:
1574   case frontend::RewriteMacros:
1575   case frontend::RunPreprocessorOnly:
1576     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1577     break;
1578   }
1579 
1580   Opts.ShowComments = Args.hasArg(OPT_C);
1581   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1582   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1583   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1584   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1585 }
1586 
1587 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1588   using namespace options;
1589   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1590   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1591   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1592   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1593   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1594   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1595   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1596 
1597   // Use the default target triple if unspecified.
1598   if (Opts.Triple.empty())
1599     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1600 }
1601 
1602 //
1603 
1604 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1605                                         const char *const *ArgBegin,
1606                                         const char *const *ArgEnd,
1607                                         DiagnosticsEngine &Diags) {
1608   bool Success = true;
1609 
1610   // Parse the arguments.
1611   OwningPtr<OptTable> Opts(createDriverOptTable());
1612   const unsigned IncludedFlagsBitmask = options::CC1Option;
1613   unsigned MissingArgIndex, MissingArgCount;
1614   OwningPtr<InputArgList> Args(
1615     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1616                     IncludedFlagsBitmask));
1617 
1618   // Check for missing argument error.
1619   if (MissingArgCount) {
1620     Diags.Report(diag::err_drv_missing_argument)
1621       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1622     Success = false;
1623   }
1624 
1625   // Issue errors on unknown arguments.
1626   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1627          ie = Args->filtered_end(); it != ie; ++it) {
1628     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1629     Success = false;
1630   }
1631 
1632   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1633   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1634   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1635   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1636             && Success;
1637   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1638   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1639   // FIXME: We shouldn't have to pass the DashX option around here
1640   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1641   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1642             && Success;
1643   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1644   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1645     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1646     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1647       Res.getLangOpts()->ObjCExceptions = 1;
1648   }
1649   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1650   // PCH file and find the original header name. Remove the need to do that in
1651   // ParsePreprocessorArgs and remove the FileManager
1652   // parameters from the function and the "FileManager.h" #include.
1653   FileManager FileMgr(Res.getFileSystemOpts());
1654   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1655   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1656                               Res.getFrontendOpts().ProgramAction);
1657   ParseTargetArgs(Res.getTargetOpts(), *Args);
1658 
1659   return Success;
1660 }
1661 
1662 namespace {
1663 
1664   class ModuleSignature {
1665     SmallVector<uint64_t, 16> Data;
1666     unsigned CurBit;
1667     uint64_t CurValue;
1668 
1669   public:
1670     ModuleSignature() : CurBit(0), CurValue(0) { }
1671 
1672     void add(uint64_t Value, unsigned Bits);
1673     void add(StringRef Value);
1674     void flush();
1675 
1676     llvm::APInt getAsInteger() const;
1677   };
1678 }
1679 
1680 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1681   CurValue |= Value << CurBit;
1682   if (CurBit + NumBits < 64) {
1683     CurBit += NumBits;
1684     return;
1685   }
1686 
1687   // Add the current word.
1688   Data.push_back(CurValue);
1689 
1690   if (CurBit)
1691     CurValue = Value >> (64-CurBit);
1692   else
1693     CurValue = 0;
1694   CurBit = (CurBit+NumBits) & 63;
1695 }
1696 
1697 void ModuleSignature::flush() {
1698   if (CurBit == 0)
1699     return;
1700 
1701   Data.push_back(CurValue);
1702   CurBit = 0;
1703   CurValue = 0;
1704 }
1705 
1706 void ModuleSignature::add(StringRef Value) {
1707   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1708     add(*I, 8);
1709 }
1710 
1711 llvm::APInt ModuleSignature::getAsInteger() const {
1712   return llvm::APInt(Data.size() * 64, Data);
1713 }
1714 
1715 std::string CompilerInvocation::getModuleHash() const {
1716   // Note: For QoI reasons, the things we use as a hash here should all be
1717   // dumped via the -module-info flag.
1718   using llvm::hash_code;
1719   using llvm::hash_value;
1720   using llvm::hash_combine;
1721 
1722   // Start the signature with the compiler version.
1723   // FIXME: We'd rather use something more cryptographically sound than
1724   // CityHash, but this will do for now.
1725   hash_code code = hash_value(getClangFullRepositoryVersion());
1726 
1727   // Extend the signature with the language options
1728 #define LANGOPT(Name, Bits, Default, Description) \
1729    code = hash_combine(code, LangOpts->Name);
1730 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1731   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1732 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1733 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1734 #include "clang/Basic/LangOptions.def"
1735 
1736   // Extend the signature with the target options.
1737   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1738                       TargetOpts->ABI, TargetOpts->CXXABI,
1739                       TargetOpts->LinkerVersion);
1740   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1741     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1742 
1743   // Extend the signature with preprocessor options.
1744   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1745   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1746   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1747 
1748   std::vector<StringRef> MacroDefs;
1749   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1750             I = getPreprocessorOpts().Macros.begin(),
1751          IEnd = getPreprocessorOpts().Macros.end();
1752        I != IEnd; ++I) {
1753     // If we're supposed to ignore this macro for the purposes of modules,
1754     // don't put it into the hash.
1755     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1756       // Check whether we're ignoring this macro.
1757       StringRef MacroDef = I->first;
1758       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1759         continue;
1760     }
1761 
1762     code = hash_combine(code, I->first, I->second);
1763   }
1764 
1765   // Extend the signature with the sysroot.
1766   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1767                       hsOpts.UseStandardSystemIncludes,
1768                       hsOpts.UseStandardCXXIncludes,
1769                       hsOpts.UseLibcxx);
1770 
1771   // Darwin-specific hack: if we have a sysroot, use the contents and
1772   // modification time of
1773   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1774   // as part of the module hash.
1775   if (!hsOpts.Sysroot.empty()) {
1776     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1777     SmallString<128> systemVersionFile;
1778     systemVersionFile += hsOpts.Sysroot;
1779     llvm::sys::path::append(systemVersionFile, "System");
1780     llvm::sys::path::append(systemVersionFile, "Library");
1781     llvm::sys::path::append(systemVersionFile, "CoreServices");
1782     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1783     if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
1784       code = hash_combine(code, buffer.get()->getBuffer());
1785 
1786       struct stat statBuf;
1787       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1788         code = hash_combine(code, statBuf.st_mtime);
1789     }
1790   }
1791 
1792   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1793 }
1794 
1795 namespace clang {
1796 
1797 // Declared in clang/Frontend/Utils.h.
1798 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1799                        DiagnosticsEngine *Diags) {
1800   int Res = Default;
1801   if (Arg *A = Args.getLastArg(Id)) {
1802     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1803       if (Diags)
1804         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1805                                                        << A->getValue();
1806     }
1807   }
1808   return Res;
1809 }
1810 }
1811