xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision e4aaac506c6d3496ae4120b68f03886402c0428c) 
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_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.hasArg(OPT_ffunction_sections);
402   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
403 
404   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
405   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
406   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
407 
408   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
409   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
410   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
411 
412   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
413   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
414   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
415   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
416   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
417     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
418     Opts.CoverageNoFunctionNamesInData =
419         Args.hasArg(OPT_coverage_no_function_names_in_data);
420     if (Args.hasArg(OPT_coverage_version_EQ)) {
421       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
422       if (CoverageVersion.size() != 4) {
423         Diags.Report(diag::err_drv_invalid_value)
424             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
425             << CoverageVersion;
426       } else {
427         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
428       }
429     }
430   }
431 
432   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
433   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
434   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
435   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
436   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
437   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
438   Opts.SanitizeMemoryTrackOrigins =
439     Args.hasArg(OPT_fsanitize_memory_track_origins);
440   Opts.SanitizeAddressZeroBaseShadow =
441     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
442   Opts.SanitizeUndefinedTrapOnError =
443     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
444   Opts.SSPBufferSize =
445       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
446   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
447   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
448     StringRef Val = A->getValue();
449     unsigned StackAlignment = Opts.StackAlignment;
450     Val.getAsInteger(10, StackAlignment);
451     Opts.StackAlignment = StackAlignment;
452   }
453 
454   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
455     StringRef Name = A->getValue();
456     unsigned Method = llvm::StringSwitch<unsigned>(Name)
457       .Case("legacy", CodeGenOptions::Legacy)
458       .Case("non-legacy", CodeGenOptions::NonLegacy)
459       .Case("mixed", CodeGenOptions::Mixed)
460       .Default(~0U);
461     if (Method == ~0U) {
462       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
463       Success = false;
464     } else {
465       Opts.setObjCDispatchMethod(
466         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
467     }
468   }
469 
470   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
471     StringRef Name = A->getValue();
472     unsigned Model = llvm::StringSwitch<unsigned>(Name)
473         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
474         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
475         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
476         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
477         .Default(~0U);
478     if (Model == ~0U) {
479       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
480       Success = false;
481     } else {
482       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
483     }
484   }
485 
486   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
487     StringRef Val = A->getValue();
488     if (Val == "fast")
489       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
490     else if (Val == "on")
491       Opts.setFPContractMode(CodeGenOptions::FPC_On);
492     else if (Val == "off")
493       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
494     else
495       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
496   }
497 
498   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
499     if (A->getOption().matches(OPT_fpcc_struct_return)) {
500       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
501     } else {
502       assert(A->getOption().matches(OPT_freg_struct_return));
503       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
504     }
505   }
506 
507   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
508 
509   return Success;
510 }
511 
512 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
513                                       ArgList &Args) {
514   using namespace options;
515   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
516   Opts.Targets = Args.getAllArgValues(OPT_MT);
517   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
518   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
519   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
520   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
521   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
522   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
523   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
524 }
525 
526 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
527                                 DiagnosticsEngine *Diags) {
528   using namespace options;
529   bool Success = true;
530 
531   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
532   Opts.DiagnosticSerializationFile =
533     Args.getLastArgValue(OPT_diagnostic_serialized_file);
534   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
535   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
536   Opts.Pedantic = Args.hasArg(OPT_pedantic);
537   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
538   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
539   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
540   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
541                                  OPT_fno_show_column,
542                                  /*Default=*/true);
543   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
544   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
545   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
546 
547   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
548 
549   // Default behavior is to not to show note include stacks.
550   Opts.ShowNoteIncludeStack = false;
551   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
552                                OPT_fno_diagnostics_show_note_include_stack))
553     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
554       Opts.ShowNoteIncludeStack = true;
555 
556   StringRef ShowOverloads =
557     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
558   if (ShowOverloads == "best")
559     Opts.setShowOverloads(Ovl_Best);
560   else if (ShowOverloads == "all")
561     Opts.setShowOverloads(Ovl_All);
562   else {
563     Success = false;
564     if (Diags)
565       Diags->Report(diag::err_drv_invalid_value)
566       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
567       << ShowOverloads;
568   }
569 
570   StringRef ShowCategory =
571     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
572   if (ShowCategory == "none")
573     Opts.ShowCategories = 0;
574   else if (ShowCategory == "id")
575     Opts.ShowCategories = 1;
576   else if (ShowCategory == "name")
577     Opts.ShowCategories = 2;
578   else {
579     Success = false;
580     if (Diags)
581       Diags->Report(diag::err_drv_invalid_value)
582       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
583       << ShowCategory;
584   }
585 
586   StringRef Format =
587     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
588   if (Format == "clang")
589     Opts.setFormat(DiagnosticOptions::Clang);
590   else if (Format == "msvc")
591     Opts.setFormat(DiagnosticOptions::Msvc);
592   else if (Format == "msvc-fallback") {
593     Opts.setFormat(DiagnosticOptions::Msvc);
594     Opts.CLFallbackMode = true;
595   } else if (Format == "vi")
596     Opts.setFormat(DiagnosticOptions::Vi);
597   else {
598     Success = false;
599     if (Diags)
600       Diags->Report(diag::err_drv_invalid_value)
601       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
602       << Format;
603   }
604 
605   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
606   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
607   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
608   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
609   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
610   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
611   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
612   Opts.MacroBacktraceLimit =
613       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
614                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
615   Opts.TemplateBacktraceLimit = getLastArgIntValue(
616       Args, OPT_ftemplate_backtrace_limit,
617       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
618   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
619       Args, OPT_fconstexpr_backtrace_limit,
620       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
621   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
622                                     DiagnosticOptions::DefaultTabStop, Diags);
623   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
624     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
625     if (Diags)
626       Diags->Report(diag::warn_ignoring_ftabstop_value)
627       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
628   }
629   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
630   addWarningArgs(Args, Opts.Warnings);
631 
632   return Success;
633 }
634 
635 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
636   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
637 }
638 
639 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
640                                    DiagnosticsEngine &Diags) {
641   using namespace options;
642   Opts.ProgramAction = frontend::ParseSyntaxOnly;
643   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
644     switch (A->getOption().getID()) {
645     default:
646       llvm_unreachable("Invalid option in group!");
647     case OPT_ast_list:
648       Opts.ProgramAction = frontend::ASTDeclList; break;
649     case OPT_ast_dump:
650       Opts.ProgramAction = frontend::ASTDump; break;
651     case OPT_ast_dump_xml:
652       Opts.ProgramAction = frontend::ASTDumpXML; 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 
805   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
806       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
807     Diags.Report(diag::err_drv_argument_not_allowed_with)
808       << "ARC migration" << "ObjC migration";
809   }
810 
811   InputKind DashX = IK_None;
812   if (const Arg *A = Args.getLastArg(OPT_x)) {
813     DashX = llvm::StringSwitch<InputKind>(A->getValue())
814       .Case("c", IK_C)
815       .Case("cl", IK_OpenCL)
816       .Case("cuda", IK_CUDA)
817       .Case("c++", IK_CXX)
818       .Case("objective-c", IK_ObjC)
819       .Case("objective-c++", IK_ObjCXX)
820       .Case("cpp-output", IK_PreprocessedC)
821       .Case("assembler-with-cpp", IK_Asm)
822       .Case("c++-cpp-output", IK_PreprocessedCXX)
823       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
824       .Case("objc-cpp-output", IK_PreprocessedObjC)
825       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
826       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
827       .Case("c-header", IK_C)
828       .Case("cl-header", IK_OpenCL)
829       .Case("objective-c-header", IK_ObjC)
830       .Case("c++-header", IK_CXX)
831       .Case("objective-c++-header", IK_ObjCXX)
832       .Cases("ast", "pcm", IK_AST)
833       .Case("ir", IK_LLVM_IR)
834       .Default(IK_None);
835     if (DashX == IK_None)
836       Diags.Report(diag::err_drv_invalid_value)
837         << A->getAsString(Args) << A->getValue();
838   }
839 
840   // '-' is the default input if none is given.
841   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
842   Opts.Inputs.clear();
843   if (Inputs.empty())
844     Inputs.push_back("-");
845   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
846     InputKind IK = DashX;
847     if (IK == IK_None) {
848       IK = FrontendOptions::getInputKindForExtension(
849         StringRef(Inputs[i]).rsplit('.').second);
850       // FIXME: Remove this hack.
851       if (i == 0)
852         DashX = IK;
853     }
854     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
855   }
856 
857   return DashX;
858 }
859 
860 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
861                                                  void *MainAddr) {
862   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
863 
864   if (!P.empty()) {
865     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
866     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
867 
868     // Get foo/lib/clang/<version>/include
869     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
870   }
871 
872   return P.str();
873 }
874 
875 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
876   using namespace options;
877   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
878   Opts.Verbose = Args.hasArg(OPT_v);
879   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
880   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
881   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
882   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
883     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
884   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
885   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
886   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
887   // -fmodules implies -fmodule-maps
888   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
889   Opts.ModuleCachePruneInterval =
890       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
891   Opts.ModuleCachePruneAfter =
892       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
893   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
894                     ie = Args.filtered_end();
895        it != ie; ++it) {
896     StringRef MacroDef = (*it)->getValue();
897     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
898   }
899   std::vector<std::string> ModuleMapFiles =
900       Args.getAllArgValues(OPT_fmodule_map_file);
901   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
902 
903   // Add -I..., -F..., and -index-header-map options in order.
904   bool IsIndexHeaderMap = false;
905   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
906                                              OPT_index_header_map),
907        ie = Args.filtered_end(); it != ie; ++it) {
908     if ((*it)->getOption().matches(OPT_index_header_map)) {
909       // -index-header-map applies to the next -I or -F.
910       IsIndexHeaderMap = true;
911       continue;
912     }
913 
914     frontend::IncludeDirGroup Group
915       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
916 
917     Opts.AddPath((*it)->getValue(), Group,
918                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
919     IsIndexHeaderMap = false;
920   }
921 
922   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
923   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
924   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
925                                              OPT_iwithprefixbefore),
926          ie = Args.filtered_end(); it != ie; ++it) {
927     const Arg *A = *it;
928     if (A->getOption().matches(OPT_iprefix))
929       Prefix = A->getValue();
930     else if (A->getOption().matches(OPT_iwithprefix))
931       Opts.AddPath(Prefix.str() + A->getValue(),
932                    frontend::After, false, true);
933     else
934       Opts.AddPath(Prefix.str() + A->getValue(),
935                    frontend::Angled, false, true);
936   }
937 
938   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
939          ie = Args.filtered_end(); it != ie; ++it)
940     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
941   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
942          ie = Args.filtered_end(); it != ie; ++it)
943     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
944   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
945          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
946     Opts.AddPath((*it)->getValue(), frontend::System, false,
947                  !(*it)->getOption().matches(OPT_iwithsysroot));
948   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
949          ie = Args.filtered_end(); it != ie; ++it)
950     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
951 
952   // Add the paths for the various language specific isystem flags.
953   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
954        ie = Args.filtered_end(); it != ie; ++it)
955     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
956   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
957        ie = Args.filtered_end(); it != ie; ++it)
958     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
959   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
960        ie = Args.filtered_end(); it != ie; ++it)
961     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
962   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
963        ie = Args.filtered_end(); it != ie; ++it)
964     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
965 
966   // Add the internal paths from a driver that detects standard include paths.
967   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
968                                             OPT_internal_externc_isystem),
969                     E = Args.filtered_end();
970        I != E; ++I) {
971     frontend::IncludeDirGroup Group = frontend::System;
972     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
973       Group = frontend::ExternCSystem;
974     Opts.AddPath((*I)->getValue(), Group, false, true);
975   }
976 
977   // Add the path prefixes which are implicitly treated as being system headers.
978   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
979                                             OPT_ino_system_prefix),
980                     E = Args.filtered_end();
981        I != E; ++I)
982     Opts.AddSystemHeaderPrefix((*I)->getValue(),
983                                (*I)->getOption().matches(OPT_isystem_prefix));
984 }
985 
986 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
987                                          LangStandard::Kind LangStd) {
988   // Set some properties which depend solely on the input kind; it would be nice
989   // to move these to the language standard, and have the driver resolve the
990   // input kind + language standard.
991   if (IK == IK_Asm) {
992     Opts.AsmPreprocessor = 1;
993   } else if (IK == IK_ObjC ||
994              IK == IK_ObjCXX ||
995              IK == IK_PreprocessedObjC ||
996              IK == IK_PreprocessedObjCXX) {
997     Opts.ObjC1 = Opts.ObjC2 = 1;
998   }
999 
1000   if (LangStd == LangStandard::lang_unspecified) {
1001     // Based on the base language, pick one.
1002     switch (IK) {
1003     case IK_None:
1004     case IK_AST:
1005     case IK_LLVM_IR:
1006       llvm_unreachable("Invalid input kind!");
1007     case IK_OpenCL:
1008       LangStd = LangStandard::lang_opencl;
1009       break;
1010     case IK_CUDA:
1011       LangStd = LangStandard::lang_cuda;
1012       break;
1013     case IK_Asm:
1014     case IK_C:
1015     case IK_PreprocessedC:
1016     case IK_ObjC:
1017     case IK_PreprocessedObjC:
1018       LangStd = LangStandard::lang_gnu99;
1019       break;
1020     case IK_CXX:
1021     case IK_PreprocessedCXX:
1022     case IK_ObjCXX:
1023     case IK_PreprocessedObjCXX:
1024       LangStd = LangStandard::lang_gnucxx98;
1025       break;
1026     }
1027   }
1028 
1029   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1030   Opts.LineComment = Std.hasLineComments();
1031   Opts.C99 = Std.isC99();
1032   Opts.C11 = Std.isC11();
1033   Opts.CPlusPlus = Std.isCPlusPlus();
1034   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1035   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1036   Opts.Digraphs = Std.hasDigraphs();
1037   Opts.GNUMode = Std.isGNUMode();
1038   Opts.GNUInline = !Std.isC99();
1039   Opts.HexFloats = Std.hasHexFloats();
1040   Opts.ImplicitInt = Std.hasImplicitInt();
1041 
1042   // Set OpenCL Version.
1043   if (LangStd == LangStandard::lang_opencl) {
1044     Opts.OpenCL = 1;
1045     Opts.OpenCLVersion = 100;
1046   }
1047   else if (LangStd == LangStandard::lang_opencl11) {
1048       Opts.OpenCL = 1;
1049       Opts.OpenCLVersion = 110;
1050   }
1051   else if (LangStd == LangStandard::lang_opencl12) {
1052     Opts.OpenCL = 1;
1053     Opts.OpenCLVersion = 120;
1054   }
1055 
1056   // OpenCL has some additional defaults.
1057   if (Opts.OpenCL) {
1058     Opts.AltiVec = 0;
1059     Opts.CXXOperatorNames = 1;
1060     Opts.LaxVectorConversions = 0;
1061     Opts.DefaultFPContract = 1;
1062     Opts.NativeHalfType = 1;
1063   }
1064 
1065   if (LangStd == LangStandard::lang_cuda)
1066     Opts.CUDA = 1;
1067 
1068   // OpenCL and C++ both have bool, true, false keywords.
1069   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1070 
1071   // C++ has wchar_t keyword.
1072   Opts.WChar = Opts.CPlusPlus;
1073 
1074   Opts.GNUKeywords = Opts.GNUMode;
1075   Opts.CXXOperatorNames = Opts.CPlusPlus;
1076 
1077   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1078   // is specified, or -std is set to a conforming mode.
1079   Opts.Trigraphs = !Opts.GNUMode;
1080 
1081   Opts.DollarIdents = !Opts.AsmPreprocessor;
1082 }
1083 
1084 /// Attempt to parse a visibility value out of the given argument.
1085 static Visibility parseVisibility(Arg *arg, ArgList &args,
1086                                   DiagnosticsEngine &diags) {
1087   StringRef value = arg->getValue();
1088   if (value == "default") {
1089     return DefaultVisibility;
1090   } else if (value == "hidden") {
1091     return HiddenVisibility;
1092   } else if (value == "protected") {
1093     // FIXME: diagnose if target does not support protected visibility
1094     return ProtectedVisibility;
1095   }
1096 
1097   diags.Report(diag::err_drv_invalid_value)
1098     << arg->getAsString(args) << value;
1099   return DefaultVisibility;
1100 }
1101 
1102 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1103                           DiagnosticsEngine &Diags) {
1104   // FIXME: Cleanup per-file based stuff.
1105   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1106   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1107     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1108 #define LANGSTANDARD(id, name, desc, features) \
1109       .Case(name, LangStandard::lang_##id)
1110 #include "clang/Frontend/LangStandards.def"
1111       .Default(LangStandard::lang_unspecified);
1112     if (LangStd == LangStandard::lang_unspecified)
1113       Diags.Report(diag::err_drv_invalid_value)
1114         << A->getAsString(Args) << A->getValue();
1115     else {
1116       // Valid standard, check to make sure language and standard are compatable.
1117       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1118       switch (IK) {
1119       case IK_C:
1120       case IK_ObjC:
1121       case IK_PreprocessedC:
1122       case IK_PreprocessedObjC:
1123         if (!(Std.isC89() || Std.isC99()))
1124           Diags.Report(diag::err_drv_argument_not_allowed_with)
1125             << A->getAsString(Args) << "C/ObjC";
1126         break;
1127       case IK_CXX:
1128       case IK_ObjCXX:
1129       case IK_PreprocessedCXX:
1130       case IK_PreprocessedObjCXX:
1131         if (!Std.isCPlusPlus())
1132           Diags.Report(diag::err_drv_argument_not_allowed_with)
1133             << A->getAsString(Args) << "C++/ObjC++";
1134         break;
1135       case IK_OpenCL:
1136         if (!Std.isC99())
1137           Diags.Report(diag::err_drv_argument_not_allowed_with)
1138             << A->getAsString(Args) << "OpenCL";
1139         break;
1140       case IK_CUDA:
1141         if (!Std.isCPlusPlus())
1142           Diags.Report(diag::err_drv_argument_not_allowed_with)
1143             << A->getAsString(Args) << "CUDA";
1144         break;
1145       default:
1146         break;
1147       }
1148     }
1149   }
1150 
1151   // -cl-std only applies for OpenCL language standards.
1152   // Override the -std option in this case.
1153   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1154     LangStandard::Kind OpenCLLangStd
1155     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1156     .Case("CL", LangStandard::lang_opencl)
1157     .Case("CL1.1", LangStandard::lang_opencl11)
1158     .Case("CL1.2", LangStandard::lang_opencl12)
1159     .Default(LangStandard::lang_unspecified);
1160 
1161     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1162       Diags.Report(diag::err_drv_invalid_value)
1163       << A->getAsString(Args) << A->getValue();
1164     }
1165     else
1166       LangStd = OpenCLLangStd;
1167   }
1168 
1169   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1170 
1171   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1172   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1173   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1174   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1175   // name, as it doesn't seem a useful distinction.
1176   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1177                                   Opts.GNUKeywords);
1178 
1179   if (Args.hasArg(OPT_fno_operator_names))
1180     Opts.CXXOperatorNames = 0;
1181 
1182   if (Opts.ObjC1) {
1183     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1184       StringRef value = arg->getValue();
1185       if (Opts.ObjCRuntime.tryParse(value))
1186         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1187     }
1188 
1189     if (Args.hasArg(OPT_fobjc_gc_only))
1190       Opts.setGC(LangOptions::GCOnly);
1191     else if (Args.hasArg(OPT_fobjc_gc))
1192       Opts.setGC(LangOptions::HybridGC);
1193     else if (Args.hasArg(OPT_fobjc_arc)) {
1194       Opts.ObjCAutoRefCount = 1;
1195       if (!Opts.ObjCRuntime.allowsARC())
1196         Diags.Report(diag::err_arc_unsupported_on_runtime);
1197 
1198       // Only set ObjCARCWeak if ARC is enabled.
1199       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1200         Opts.ObjCARCWeak = 1;
1201       else
1202         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1203     }
1204 
1205     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1206       Opts.ObjCInferRelatedResultType = 0;
1207   }
1208 
1209   if (Args.hasArg(OPT_fgnu89_inline))
1210     Opts.GNUInline = 1;
1211 
1212   if (Args.hasArg(OPT_fapple_kext)) {
1213     if (!Opts.CPlusPlus)
1214       Diags.Report(diag::warn_c_kext);
1215     else
1216       Opts.AppleKext = 1;
1217   }
1218 
1219   if (Args.hasArg(OPT_print_ivar_layout))
1220     Opts.ObjCGCBitmapPrint = 1;
1221   if (Args.hasArg(OPT_fno_constant_cfstrings))
1222     Opts.NoConstantCFStrings = 1;
1223 
1224   if (Args.hasArg(OPT_faltivec))
1225     Opts.AltiVec = 1;
1226 
1227   if (Args.hasArg(OPT_pthread))
1228     Opts.POSIXThreads = 1;
1229 
1230   // The value-visibility mode defaults to "default".
1231   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1232     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1233   } else {
1234     Opts.setValueVisibilityMode(DefaultVisibility);
1235   }
1236 
1237   // The type-visibility mode defaults to the value-visibility mode.
1238   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1239     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1240   } else {
1241     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1242   }
1243 
1244   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1245     Opts.InlineVisibilityHidden = 1;
1246 
1247   if (Args.hasArg(OPT_ftrapv)) {
1248     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1249     // Set the handler, if one is specified.
1250     Opts.OverflowHandler =
1251         Args.getLastArgValue(OPT_ftrapv_handler);
1252   }
1253   else if (Args.hasArg(OPT_fwrapv))
1254     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1255 
1256   if (Args.hasArg(OPT_trigraphs))
1257     Opts.Trigraphs = 1;
1258 
1259   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1260                                    OPT_fno_dollars_in_identifiers,
1261                                    Opts.DollarIdents);
1262   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1263   Opts.MicrosoftExt
1264     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1265   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1266   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1267   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1268   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1269   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1270   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1271                                    Opts.ConstStrings);
1272   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1273     Opts.LaxVectorConversions = 0;
1274   if (Args.hasArg(OPT_fno_threadsafe_statics))
1275     Opts.ThreadsafeStatics = 0;
1276   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1277   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1278   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1279   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1280   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1281 
1282   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1283   Opts.Blocks = Args.hasArg(OPT_fblocks);
1284   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1285   Opts.Modules = Args.hasArg(OPT_fmodules);
1286   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1287   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1288   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1289   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1290   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1291   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1292   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1293   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1294   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1295   Opts.SizedDeallocation = Args.hasArg(OPT_fsized_deallocation);
1296   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1297   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1298   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1299   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1300   Opts.InstantiationDepth =
1301       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1302   Opts.ConstexprCallDepth =
1303       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1304   Opts.ConstexprStepLimit =
1305       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1306   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1307   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1308   Opts.NumLargeByValueCopy =
1309       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1310   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1311   Opts.ObjCConstantStringClass =
1312     Args.getLastArgValue(OPT_fconstant_string_class);
1313   Opts.ObjCDefaultSynthProperties =
1314     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1315   Opts.EncodeExtendedBlockSig =
1316     Args.hasArg(OPT_fencode_extended_block_signature);
1317   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1318   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1319   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1320   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1321   Opts.Static = Args.hasArg(OPT_static_define);
1322   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1323   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1324                         || Args.hasArg(OPT_fdump_record_layouts);
1325   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1326   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1327   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1328   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1329   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1330   Opts.MRTD = Args.hasArg(OPT_mrtd);
1331   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1332   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1333   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1334   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1335   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1336   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1337   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1338   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1339 
1340   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1341     switch (llvm::StringSwitch<unsigned>(A->getValue())
1342       .Case("target", LangOptions::ASMM_Target)
1343       .Case("no", LangOptions::ASMM_Off)
1344       .Case("yes", LangOptions::ASMM_On)
1345       .Default(255)) {
1346     default:
1347       Diags.Report(diag::err_drv_invalid_value)
1348         << "-faddress-space-map-mangling=" << A->getValue();
1349       break;
1350     case LangOptions::ASMM_Target:
1351       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1352       break;
1353     case LangOptions::ASMM_On:
1354       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1355       break;
1356     case LangOptions::ASMM_Off:
1357       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1358       break;
1359     }
1360   }
1361 
1362   // Check if -fopenmp is specified.
1363   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1364 
1365   // Record whether the __DEPRECATED define was requested.
1366   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1367                                  OPT_fno_deprecated_macro,
1368                                  Opts.Deprecated);
1369 
1370   // FIXME: Eliminate this dependency.
1371   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1372        OptSize = getOptimizationLevelSize(Args);
1373   Opts.Optimize = Opt != 0;
1374   Opts.OptimizeSize = OptSize != 0;
1375 
1376   // This is the __NO_INLINE__ define, which just depends on things like the
1377   // optimization level and -fno-inline, not actually whether the backend has
1378   // inlining enabled.
1379   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1380 
1381   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1382   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1383 
1384   Opts.RetainCommentsFromSystemHeaders =
1385       Args.hasArg(OPT_fretain_comments_from_system_headers);
1386 
1387   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1388   switch (SSP) {
1389   default:
1390     Diags.Report(diag::err_drv_invalid_value)
1391       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1392     break;
1393   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1394   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1395   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1396   }
1397 
1398   // Parse -fsanitize= arguments.
1399   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1400   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1401     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1402     // efficiently map string values to them. Perform the mapping indirectly:
1403     // convert strings to enumerated values, then switch over the enum to set
1404     // the right bitfield value.
1405     enum Sanitizer {
1406 #define SANITIZER(NAME, ID) \
1407       ID,
1408 #include "clang/Basic/Sanitizers.def"
1409       Unknown
1410     };
1411     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1412 #define SANITIZER(NAME, ID) \
1413               .Case(NAME, ID)
1414 #include "clang/Basic/Sanitizers.def"
1415               .Default(Unknown)) {
1416 #define SANITIZER(NAME, ID) \
1417     case ID: \
1418       Opts.Sanitize.ID = true; \
1419       break;
1420 #include "clang/Basic/Sanitizers.def"
1421 
1422     case Unknown:
1423       Diags.Report(diag::err_drv_invalid_value)
1424         << "-fsanitize=" << Sanitizers[I];
1425       break;
1426     }
1427   }
1428 }
1429 
1430 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1431                                   FileManager &FileMgr,
1432                                   DiagnosticsEngine &Diags) {
1433   using namespace options;
1434   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1435   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1436   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1437       Opts.TokenCache = A->getValue();
1438   else
1439     Opts.TokenCache = Opts.ImplicitPTHInclude;
1440   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1441   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1442   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1443 
1444   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1445   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1446          ie = Args.filtered_end(); it != ie; ++it) {
1447     const Arg *A = *it;
1448     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1449   }
1450 
1451   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1452     StringRef Value(A->getValue());
1453     size_t Comma = Value.find(',');
1454     unsigned Bytes = 0;
1455     unsigned EndOfLine = 0;
1456 
1457     if (Comma == StringRef::npos ||
1458         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1459         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1460       Diags.Report(diag::err_drv_preamble_format);
1461     else {
1462       Opts.PrecompiledPreambleBytes.first = Bytes;
1463       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1464     }
1465   }
1466 
1467   // Add macros from the command line.
1468   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1469          ie = Args.filtered_end(); it != ie; ++it) {
1470     if ((*it)->getOption().matches(OPT_D))
1471       Opts.addMacroDef((*it)->getValue());
1472     else
1473       Opts.addMacroUndef((*it)->getValue());
1474   }
1475 
1476   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1477 
1478   // Add the ordered list of -includes.
1479   for (arg_iterator it = Args.filtered_begin(OPT_include),
1480          ie = Args.filtered_end(); it != ie; ++it) {
1481     const Arg *A = *it;
1482     Opts.Includes.push_back(A->getValue());
1483   }
1484 
1485   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1486          ie = Args.filtered_end(); it != ie; ++it) {
1487     const Arg *A = *it;
1488     Opts.ChainedIncludes.push_back(A->getValue());
1489   }
1490 
1491   // Include 'altivec.h' if -faltivec option present
1492   if (Args.hasArg(OPT_faltivec))
1493     Opts.Includes.push_back("altivec.h");
1494 
1495   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1496          ie = Args.filtered_end(); it != ie; ++it) {
1497     const Arg *A = *it;
1498     std::pair<StringRef,StringRef> Split =
1499       StringRef(A->getValue()).split(';');
1500 
1501     if (Split.second.empty()) {
1502       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1503       continue;
1504     }
1505 
1506     Opts.addRemappedFile(Split.first, Split.second);
1507   }
1508 
1509   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1510     StringRef Name = A->getValue();
1511     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1512       .Case("libc++", ARCXX_libcxx)
1513       .Case("libstdc++", ARCXX_libstdcxx)
1514       .Case("none", ARCXX_nolib)
1515       .Default(~0U);
1516     if (Library == ~0U)
1517       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1518     else
1519       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1520   }
1521 }
1522 
1523 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1524                                         ArgList &Args,
1525                                         frontend::ActionKind Action) {
1526   using namespace options;
1527 
1528   switch (Action) {
1529   case frontend::ASTDeclList:
1530   case frontend::ASTDump:
1531   case frontend::ASTDumpXML:
1532   case frontend::ASTPrint:
1533   case frontend::ASTView:
1534   case frontend::EmitAssembly:
1535   case frontend::EmitBC:
1536   case frontend::EmitHTML:
1537   case frontend::EmitLLVM:
1538   case frontend::EmitLLVMOnly:
1539   case frontend::EmitCodeGenOnly:
1540   case frontend::EmitObj:
1541   case frontend::FixIt:
1542   case frontend::GenerateModule:
1543   case frontend::GeneratePCH:
1544   case frontend::GeneratePTH:
1545   case frontend::ParseSyntaxOnly:
1546   case frontend::ModuleFileInfo:
1547   case frontend::PluginAction:
1548   case frontend::PrintDeclContext:
1549   case frontend::RewriteObjC:
1550   case frontend::RewriteTest:
1551   case frontend::RunAnalysis:
1552   case frontend::MigrateSource:
1553     Opts.ShowCPP = 0;
1554     break;
1555 
1556   case frontend::DumpRawTokens:
1557   case frontend::DumpTokens:
1558   case frontend::InitOnly:
1559   case frontend::PrintPreamble:
1560   case frontend::PrintPreprocessedInput:
1561   case frontend::RewriteMacros:
1562   case frontend::RunPreprocessorOnly:
1563     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1564     break;
1565   }
1566 
1567   Opts.ShowComments = Args.hasArg(OPT_C);
1568   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1569   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1570   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1571   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1572 }
1573 
1574 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1575   using namespace options;
1576   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1577   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1578   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1579   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1580   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1581   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1582   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1583 
1584   // Use the default target triple if unspecified.
1585   if (Opts.Triple.empty())
1586     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1587 }
1588 
1589 //
1590 
1591 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1592                                         const char *const *ArgBegin,
1593                                         const char *const *ArgEnd,
1594                                         DiagnosticsEngine &Diags) {
1595   bool Success = true;
1596 
1597   // Parse the arguments.
1598   OwningPtr<OptTable> Opts(createDriverOptTable());
1599   const unsigned IncludedFlagsBitmask = options::CC1Option;
1600   unsigned MissingArgIndex, MissingArgCount;
1601   OwningPtr<InputArgList> Args(
1602     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1603                     IncludedFlagsBitmask));
1604 
1605   // Check for missing argument error.
1606   if (MissingArgCount) {
1607     Diags.Report(diag::err_drv_missing_argument)
1608       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1609     Success = false;
1610   }
1611 
1612   // Issue errors on unknown arguments.
1613   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1614          ie = Args->filtered_end(); it != ie; ++it) {
1615     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1616     Success = false;
1617   }
1618 
1619   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1620   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1621   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1622   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1623             && Success;
1624   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1625   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1626   // FIXME: We shouldn't have to pass the DashX option around here
1627   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1628   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1629             && Success;
1630   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1631   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1632     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1633     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1634       Res.getLangOpts()->ObjCExceptions = 1;
1635   }
1636   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1637   // PCH file and find the original header name. Remove the need to do that in
1638   // ParsePreprocessorArgs and remove the FileManager
1639   // parameters from the function and the "FileManager.h" #include.
1640   FileManager FileMgr(Res.getFileSystemOpts());
1641   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1642   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1643                               Res.getFrontendOpts().ProgramAction);
1644   ParseTargetArgs(Res.getTargetOpts(), *Args);
1645 
1646   return Success;
1647 }
1648 
1649 namespace {
1650 
1651   class ModuleSignature {
1652     SmallVector<uint64_t, 16> Data;
1653     unsigned CurBit;
1654     uint64_t CurValue;
1655 
1656   public:
1657     ModuleSignature() : CurBit(0), CurValue(0) { }
1658 
1659     void add(uint64_t Value, unsigned Bits);
1660     void add(StringRef Value);
1661     void flush();
1662 
1663     llvm::APInt getAsInteger() const;
1664   };
1665 }
1666 
1667 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1668   CurValue |= Value << CurBit;
1669   if (CurBit + NumBits < 64) {
1670     CurBit += NumBits;
1671     return;
1672   }
1673 
1674   // Add the current word.
1675   Data.push_back(CurValue);
1676 
1677   if (CurBit)
1678     CurValue = Value >> (64-CurBit);
1679   else
1680     CurValue = 0;
1681   CurBit = (CurBit+NumBits) & 63;
1682 }
1683 
1684 void ModuleSignature::flush() {
1685   if (CurBit == 0)
1686     return;
1687 
1688   Data.push_back(CurValue);
1689   CurBit = 0;
1690   CurValue = 0;
1691 }
1692 
1693 void ModuleSignature::add(StringRef Value) {
1694   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1695     add(*I, 8);
1696 }
1697 
1698 llvm::APInt ModuleSignature::getAsInteger() const {
1699   return llvm::APInt(Data.size() * 64, Data);
1700 }
1701 
1702 std::string CompilerInvocation::getModuleHash() const {
1703   // Note: For QoI reasons, the things we use as a hash here should all be
1704   // dumped via the -module-info flag.
1705   using llvm::hash_code;
1706   using llvm::hash_value;
1707   using llvm::hash_combine;
1708 
1709   // Start the signature with the compiler version.
1710   // FIXME: We'd rather use something more cryptographically sound than
1711   // CityHash, but this will do for now.
1712   hash_code code = hash_value(getClangFullRepositoryVersion());
1713 
1714   // Extend the signature with the language options
1715 #define LANGOPT(Name, Bits, Default, Description) \
1716    code = hash_combine(code, LangOpts->Name);
1717 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1718   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1719 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1720 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1721 #include "clang/Basic/LangOptions.def"
1722 
1723   // Extend the signature with the target options.
1724   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1725                       TargetOpts->ABI, TargetOpts->CXXABI,
1726                       TargetOpts->LinkerVersion);
1727   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1728     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1729 
1730   // Extend the signature with preprocessor options.
1731   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1732   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1733   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1734 
1735   std::vector<StringRef> MacroDefs;
1736   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1737             I = getPreprocessorOpts().Macros.begin(),
1738          IEnd = getPreprocessorOpts().Macros.end();
1739        I != IEnd; ++I) {
1740     // If we're supposed to ignore this macro for the purposes of modules,
1741     // don't put it into the hash.
1742     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1743       // Check whether we're ignoring this macro.
1744       StringRef MacroDef = I->first;
1745       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1746         continue;
1747     }
1748 
1749     code = hash_combine(code, I->first, I->second);
1750   }
1751 
1752   // Extend the signature with the sysroot.
1753   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1754                       hsOpts.UseStandardSystemIncludes,
1755                       hsOpts.UseStandardCXXIncludes,
1756                       hsOpts.UseLibcxx);
1757 
1758   // Darwin-specific hack: if we have a sysroot, use the contents and
1759   // modification time of
1760   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1761   // as part of the module hash.
1762   if (!hsOpts.Sysroot.empty()) {
1763     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1764     SmallString<128> systemVersionFile;
1765     systemVersionFile += hsOpts.Sysroot;
1766     llvm::sys::path::append(systemVersionFile, "System");
1767     llvm::sys::path::append(systemVersionFile, "Library");
1768     llvm::sys::path::append(systemVersionFile, "CoreServices");
1769     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1770     if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
1771       code = hash_combine(code, buffer.get()->getBuffer());
1772 
1773       struct stat statBuf;
1774       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1775         code = hash_combine(code, statBuf.st_mtime);
1776     }
1777   }
1778 
1779   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1780 }
1781 
1782 namespace clang {
1783 
1784 // Declared in clang/Frontend/Utils.h.
1785 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1786                        DiagnosticsEngine *Diags) {
1787   int Res = Default;
1788   if (Arg *A = Args.getLastArg(Id)) {
1789     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1790       if (Diags)
1791         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1792                                                        << A->getValue();
1793     }
1794   }
1795   return Res;
1796 }
1797 }
1798