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/Atomic.h"
32 #include "llvm/Support/ErrorHandling.h"
33 #include "llvm/Support/FileSystem.h"
34 #include "llvm/Support/Host.h"
35 #include "llvm/Support/Path.h"
36 #include "llvm/Support/Process.h"
37 #include "llvm/Support/system_error.h"
38 #include <sys/stat.h>
39 using namespace clang;
40 
41 //===----------------------------------------------------------------------===//
42 // Initialization.
43 //===----------------------------------------------------------------------===//
44 
45 CompilerInvocationBase::CompilerInvocationBase()
46   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
47     DiagnosticOpts(new DiagnosticOptions()),
48     HeaderSearchOpts(new HeaderSearchOptions()),
49     PreprocessorOpts(new PreprocessorOptions()) {}
50 
51 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
52   : RefCountedBase<CompilerInvocation>(),
53     LangOpts(new LangOptions(*X.getLangOpts())),
54     TargetOpts(new TargetOptions(X.getTargetOpts())),
55     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
56     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
57     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
58 
59 //===----------------------------------------------------------------------===//
60 // Deserialization (from args)
61 //===----------------------------------------------------------------------===//
62 
63 using namespace clang::driver;
64 using namespace clang::driver::options;
65 using namespace llvm::opt;
66 
67 //
68 
69 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
70                                      DiagnosticsEngine &Diags) {
71   unsigned DefaultOpt = 0;
72   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
73     DefaultOpt = 2;
74 
75   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
76     if (A->getOption().matches(options::OPT_O0))
77       return 0;
78 
79     if (A->getOption().matches(options::OPT_Ofast))
80       return 3;
81 
82     assert (A->getOption().matches(options::OPT_O));
83 
84     StringRef S(A->getValue());
85     if (S == "s" || S == "z" || S.empty())
86       return 2;
87 
88     return getLastArgIntValue(Args, OPT_O, DefaultOpt, Diags);
89   }
90 
91   return DefaultOpt;
92 }
93 
94 static unsigned getOptimizationLevelSize(ArgList &Args) {
95   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
96     if (A->getOption().matches(options::OPT_O)) {
97       switch (A->getValue()[0]) {
98       default:
99         return 0;
100       case 's':
101         return 1;
102       case 'z':
103         return 2;
104       }
105     }
106   }
107   return 0;
108 }
109 
110 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
111   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
112          E = Args.filtered_end(); I != E; ++I) {
113     Arg *A = *I;
114     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
115     // to the warning list. Else, add its value (for the OPT_W case).
116     if (A->getOption().getKind() == Option::FlagClass) {
117       Warnings.push_back(A->getOption().getName().substr(1));
118     } else {
119       for (unsigned Idx = 0, End = A->getNumValues();
120            Idx < End; ++Idx) {
121         StringRef V = A->getValue(Idx);
122         // "-Wl," and such are not warning options.
123         // FIXME: Should be handled by putting these in separate flags.
124         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
125           continue;
126 
127         Warnings.push_back(V);
128       }
129     }
130   }
131 }
132 
133 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
134                               DiagnosticsEngine &Diags) {
135   using namespace options;
136   bool Success = true;
137   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
138     StringRef Name = A->getValue();
139     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
140 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
141       .Case(CMDFLAG, NAME##Model)
142 #include "clang/StaticAnalyzer/Core/Analyses.def"
143       .Default(NumStores);
144     if (Value == NumStores) {
145       Diags.Report(diag::err_drv_invalid_value)
146         << A->getAsString(Args) << Name;
147       Success = false;
148     } else {
149       Opts.AnalysisStoreOpt = Value;
150     }
151   }
152 
153   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
154     StringRef Name = A->getValue();
155     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
156 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
157       .Case(CMDFLAG, NAME##Model)
158 #include "clang/StaticAnalyzer/Core/Analyses.def"
159       .Default(NumConstraints);
160     if (Value == NumConstraints) {
161       Diags.Report(diag::err_drv_invalid_value)
162         << A->getAsString(Args) << Name;
163       Success = false;
164     } else {
165       Opts.AnalysisConstraintsOpt = Value;
166     }
167   }
168 
169   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
170     StringRef Name = A->getValue();
171     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
172 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN) \
173       .Case(CMDFLAG, PD_##NAME)
174 #include "clang/StaticAnalyzer/Core/Analyses.def"
175       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
176     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
177       Diags.Report(diag::err_drv_invalid_value)
178         << A->getAsString(Args) << Name;
179       Success = false;
180     } else {
181       Opts.AnalysisDiagOpt = Value;
182     }
183   }
184 
185   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
186     StringRef Name = A->getValue();
187     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
188 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
189       .Case(CMDFLAG, NAME)
190 #include "clang/StaticAnalyzer/Core/Analyses.def"
191       .Default(NumPurgeModes);
192     if (Value == NumPurgeModes) {
193       Diags.Report(diag::err_drv_invalid_value)
194         << A->getAsString(Args) << Name;
195       Success = false;
196     } else {
197       Opts.AnalysisPurgeOpt = Value;
198     }
199   }
200 
201   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
202     StringRef Name = A->getValue();
203     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
204 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
205       .Case(CMDFLAG, NAME)
206 #include "clang/StaticAnalyzer/Core/Analyses.def"
207       .Default(NumInliningModes);
208     if (Value == NumInliningModes) {
209       Diags.Report(diag::err_drv_invalid_value)
210         << A->getAsString(Args) << Name;
211       Success = false;
212     } else {
213       Opts.InliningMode = Value;
214     }
215   }
216 
217   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
218   Opts.visualizeExplodedGraphWithGraphViz =
219     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
220   Opts.visualizeExplodedGraphWithUbiGraph =
221     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
222   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
223   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
224   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
225   Opts.AnalyzeNestedBlocks =
226     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
227   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
228   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
229   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
230   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
231   Opts.maxBlockVisitOnPath =
232       getLastArgIntValue(Args, OPT_analyzer_max_loop, 4, Diags);
233   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
234   Opts.InlineMaxStackDepth =
235       getLastArgIntValue(Args, OPT_analyzer_inline_max_stack_depth,
236                          Opts.InlineMaxStackDepth, Diags);
237 
238   Opts.CheckersControlList.clear();
239   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
240                                              OPT_analyzer_disable_checker),
241          ie = Args.filtered_end(); it != ie; ++it) {
242     const Arg *A = *it;
243     A->claim();
244     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
245     // We can have a list of comma separated checker names, e.g:
246     // '-analyzer-checker=cocoa,unix'
247     StringRef checkerList = A->getValue();
248     SmallVector<StringRef, 4> checkers;
249     checkerList.split(checkers, ",");
250     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
251       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
252   }
253 
254   // Go through the analyzer configuration options.
255   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
256        ie = Args.filtered_end(); it != ie; ++it) {
257     const Arg *A = *it;
258     A->claim();
259     // We can have a list of comma separated config names, e.g:
260     // '-analyzer-config key1=val1,key2=val2'
261     StringRef configList = A->getValue();
262     SmallVector<StringRef, 4> configVals;
263     configList.split(configVals, ",");
264     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
265       StringRef key, val;
266       llvm::tie(key, val) = configVals[i].split("=");
267       if (val.empty()) {
268         Diags.Report(SourceLocation(),
269                      diag::err_analyzer_config_no_value) << configVals[i];
270         Success = false;
271         break;
272       }
273       if (val.find('=') != StringRef::npos) {
274         Diags.Report(SourceLocation(),
275                      diag::err_analyzer_config_multiple_values)
276           << configVals[i];
277         Success = false;
278         break;
279       }
280       Opts.Config[key] = val;
281     }
282   }
283 
284   return Success;
285 }
286 
287 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
288   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
289   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
290   return true;
291 }
292 
293 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
294   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
295   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
296 }
297 
298 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
299                              DiagnosticsEngine &Diags,
300                              const TargetOptions &TargetOpts) {
301   using namespace options;
302   bool Success = true;
303 
304   Opts.OptimizationLevel = getOptimizationLevel(Args, IK, Diags);
305   // TODO: This could be done in Driver
306   unsigned MaxOptLevel = 3;
307   if (Opts.OptimizationLevel > MaxOptLevel) {
308     // If the optimization level is not supported, fall back on the default optimization
309     Diags.Report(diag::warn_drv_optimization_value)
310         << Args.getLastArg(OPT_O)->getAsString(Args) << "-O" << MaxOptLevel;
311     Opts.OptimizationLevel = MaxOptLevel;
312   }
313 
314   // We must always run at least the always inlining pass.
315   Opts.setInlining(
316     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
317                                  : CodeGenOptions::OnlyAlwaysInlining);
318   // -fno-inline-functions overrides OptimizationLevel > 1.
319   Opts.NoInline = Args.hasArg(OPT_fno_inline);
320   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
321                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
322 
323   if (Args.hasArg(OPT_gline_tables_only)) {
324     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
325   } else if (Args.hasArg(OPT_g_Flag) || Args.hasArg(OPT_gdwarf_2) ||
326              Args.hasArg(OPT_gdwarf_3) || Args.hasArg(OPT_gdwarf_4)) {
327     bool Default = false;
328     // Until dtrace (via CTF) can deal with distributed debug info,
329     // Darwin defaults to standalone/full debug info.
330     if (llvm::Triple(TargetOpts.Triple).isOSDarwin())
331       Default = true;
332 
333     if (Args.hasFlag(OPT_fstandalone_debug, OPT_fno_standalone_debug, Default))
334       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
335     else
336       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
337   }
338   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
339   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
340   if (Args.hasArg(OPT_gdwarf_2))
341     Opts.DwarfVersion = 2;
342   else if (Args.hasArg(OPT_gdwarf_3))
343     Opts.DwarfVersion = 3;
344   else if (Args.hasArg(OPT_gdwarf_4))
345     Opts.DwarfVersion = 4;
346   else if (Opts.getDebugInfo() != CodeGenOptions::NoDebugInfo)
347     // Default Dwarf version is 4 if we are generating debug information.
348     Opts.DwarfVersion = 4;
349 
350   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
351   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
352   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
353   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
354     OPT_fuse_register_sized_bitfield_access);
355   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
356   Opts.StructPathTBAA = !Args.hasArg(OPT_no_struct_path_tbaa);
357   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
358   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
359   Opts.NoCommon = Args.hasArg(OPT_fno_common);
360   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
361   Opts.OptimizeSize = getOptimizationLevelSize(Args);
362   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
363                             Args.hasArg(OPT_ffreestanding));
364   Opts.UnrollLoops =
365       Args.hasFlag(OPT_funroll_loops, OPT_fno_unroll_loops,
366                    (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize));
367   Opts.RerollLoops = Args.hasArg(OPT_freroll_loops);
368 
369   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
370   Opts.SampleProfileFile = Args.getLastArgValue(OPT_fprofile_sample_use_EQ);
371   Opts.ProfileInstrGenerate = Args.hasArg(OPT_fprofile_instr_generate);
372   Opts.InstrProfileInput = Args.getLastArgValue(OPT_fprofile_instr_use_EQ);
373   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
374   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
375   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
376   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
377   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
378   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
379   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
380   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
381   Opts.DisableFree = Args.hasArg(OPT_disable_free);
382   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
383   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
384   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
385   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
386   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
387   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
388                        Args.hasArg(OPT_cl_finite_math_only)||
389                        Args.hasArg(OPT_cl_fast_relaxed_math));
390   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
391                        Args.hasArg(OPT_cl_finite_math_only)||
392                        Args.hasArg(OPT_cl_fast_relaxed_math));
393   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
394   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
395   Opts.NumRegisterParameters = getLastArgIntValue(Args, OPT_mregparm, 0, Diags);
396   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
397   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
398   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
399   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
400   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
401   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
402   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
403   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
404   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
405   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
406   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
407                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
408                       Args.hasArg(OPT_cl_fast_relaxed_math);
409   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
410   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
411   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
412   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
413 
414   Opts.FunctionSections = Args.hasFlag(OPT_ffunction_sections,
415                                        OPT_fno_function_sections, false);
416   Opts.DataSections = Args.hasFlag(OPT_fdata_sections,
417                                    OPT_fno_data_sections, false);
418 
419   Opts.VectorizeBB = Args.hasArg(OPT_vectorize_slp_aggressive);
420   Opts.VectorizeLoop = Args.hasArg(OPT_vectorize_loops);
421   Opts.VectorizeSLP = Args.hasArg(OPT_vectorize_slp);
422 
423   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
424   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
425   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
426 
427   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
428   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
429   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
430   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
431   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
432     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
433     Opts.CoverageNoFunctionNamesInData =
434         Args.hasArg(OPT_coverage_no_function_names_in_data);
435     if (Args.hasArg(OPT_coverage_version_EQ)) {
436       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
437       if (CoverageVersion.size() != 4) {
438         Diags.Report(diag::err_drv_invalid_value)
439             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
440             << CoverageVersion;
441       } else {
442         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
443       }
444     }
445   }
446 
447   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
448   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
449   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
450   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
451   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
452   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
453   Opts.SanitizeMemoryTrackOrigins =
454     Args.hasArg(OPT_fsanitize_memory_track_origins);
455   Opts.SanitizeUndefinedTrapOnError =
456     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
457   Opts.SSPBufferSize =
458       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
459   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
460   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
461     StringRef Val = A->getValue();
462     unsigned StackAlignment = Opts.StackAlignment;
463     Val.getAsInteger(10, StackAlignment);
464     Opts.StackAlignment = StackAlignment;
465   }
466 
467   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
468     StringRef Name = A->getValue();
469     unsigned Method = llvm::StringSwitch<unsigned>(Name)
470       .Case("legacy", CodeGenOptions::Legacy)
471       .Case("non-legacy", CodeGenOptions::NonLegacy)
472       .Case("mixed", CodeGenOptions::Mixed)
473       .Default(~0U);
474     if (Method == ~0U) {
475       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
476       Success = false;
477     } else {
478       Opts.setObjCDispatchMethod(
479         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
480     }
481   }
482 
483   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
484     StringRef Name = A->getValue();
485     unsigned Model = llvm::StringSwitch<unsigned>(Name)
486         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
487         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
488         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
489         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
490         .Default(~0U);
491     if (Model == ~0U) {
492       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
493       Success = false;
494     } else {
495       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
496     }
497   }
498 
499   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
500     StringRef Val = A->getValue();
501     if (Val == "fast")
502       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
503     else if (Val == "on")
504       Opts.setFPContractMode(CodeGenOptions::FPC_On);
505     else if (Val == "off")
506       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
507     else
508       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
509   }
510 
511   if (Arg *A = Args.getLastArg(OPT_fpcc_struct_return, OPT_freg_struct_return)) {
512     if (A->getOption().matches(OPT_fpcc_struct_return)) {
513       Opts.setStructReturnConvention(CodeGenOptions::SRCK_OnStack);
514     } else {
515       assert(A->getOption().matches(OPT_freg_struct_return));
516       Opts.setStructReturnConvention(CodeGenOptions::SRCK_InRegs);
517     }
518   }
519 
520   Opts.DependentLibraries = Args.getAllArgValues(OPT_dependent_lib);
521 
522   return Success;
523 }
524 
525 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
526                                       ArgList &Args) {
527   using namespace options;
528   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
529   Opts.Targets = Args.getAllArgValues(OPT_MT);
530   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
531   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
532   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
533   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
534   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
535   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
536   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
537 }
538 
539 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
540                                 DiagnosticsEngine *Diags) {
541   using namespace options;
542   bool Success = true;
543 
544   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
545   Opts.DiagnosticSerializationFile =
546     Args.getLastArgValue(OPT_diagnostic_serialized_file);
547   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
548   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
549   Opts.Pedantic = Args.hasArg(OPT_pedantic);
550   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
551   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
552   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
553   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
554                                  OPT_fno_show_column,
555                                  /*Default=*/true);
556   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
557   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
558   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
559 
560   llvm::sys::Process::UseANSIEscapeCodes(Args.hasArg(OPT_fansi_escape_codes));
561 
562   // Default behavior is to not to show note include stacks.
563   Opts.ShowNoteIncludeStack = false;
564   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
565                                OPT_fno_diagnostics_show_note_include_stack))
566     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
567       Opts.ShowNoteIncludeStack = true;
568 
569   StringRef ShowOverloads =
570     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
571   if (ShowOverloads == "best")
572     Opts.setShowOverloads(Ovl_Best);
573   else if (ShowOverloads == "all")
574     Opts.setShowOverloads(Ovl_All);
575   else {
576     Success = false;
577     if (Diags)
578       Diags->Report(diag::err_drv_invalid_value)
579       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
580       << ShowOverloads;
581   }
582 
583   StringRef ShowCategory =
584     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
585   if (ShowCategory == "none")
586     Opts.ShowCategories = 0;
587   else if (ShowCategory == "id")
588     Opts.ShowCategories = 1;
589   else if (ShowCategory == "name")
590     Opts.ShowCategories = 2;
591   else {
592     Success = false;
593     if (Diags)
594       Diags->Report(diag::err_drv_invalid_value)
595       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
596       << ShowCategory;
597   }
598 
599   StringRef Format =
600     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
601   if (Format == "clang")
602     Opts.setFormat(DiagnosticOptions::Clang);
603   else if (Format == "msvc")
604     Opts.setFormat(DiagnosticOptions::Msvc);
605   else if (Format == "msvc-fallback") {
606     Opts.setFormat(DiagnosticOptions::Msvc);
607     Opts.CLFallbackMode = true;
608   } else if (Format == "vi")
609     Opts.setFormat(DiagnosticOptions::Vi);
610   else {
611     Success = false;
612     if (Diags)
613       Diags->Report(diag::err_drv_invalid_value)
614       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
615       << Format;
616   }
617 
618   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
619   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
620   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
621   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
622   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
623   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
624   Opts.ErrorLimit = getLastArgIntValue(Args, OPT_ferror_limit, 0, Diags);
625   Opts.MacroBacktraceLimit =
626       getLastArgIntValue(Args, OPT_fmacro_backtrace_limit,
627                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
628   Opts.TemplateBacktraceLimit = getLastArgIntValue(
629       Args, OPT_ftemplate_backtrace_limit,
630       DiagnosticOptions::DefaultTemplateBacktraceLimit, Diags);
631   Opts.ConstexprBacktraceLimit = getLastArgIntValue(
632       Args, OPT_fconstexpr_backtrace_limit,
633       DiagnosticOptions::DefaultConstexprBacktraceLimit, Diags);
634   Opts.TabStop = getLastArgIntValue(Args, OPT_ftabstop,
635                                     DiagnosticOptions::DefaultTabStop, Diags);
636   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
637     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
638     if (Diags)
639       Diags->Report(diag::warn_ignoring_ftabstop_value)
640       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
641   }
642   Opts.MessageLength = getLastArgIntValue(Args, OPT_fmessage_length, 0, Diags);
643   addWarningArgs(Args, Opts.Warnings);
644 
645   return Success;
646 }
647 
648 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
649   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
650 }
651 
652 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
653                                    DiagnosticsEngine &Diags) {
654   using namespace options;
655   Opts.ProgramAction = frontend::ParseSyntaxOnly;
656   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
657     switch (A->getOption().getID()) {
658     default:
659       llvm_unreachable("Invalid option in group!");
660     case OPT_ast_list:
661       Opts.ProgramAction = frontend::ASTDeclList; break;
662     case OPT_ast_dump:
663       Opts.ProgramAction = frontend::ASTDump; break;
664     case OPT_ast_print:
665       Opts.ProgramAction = frontend::ASTPrint; break;
666     case OPT_ast_view:
667       Opts.ProgramAction = frontend::ASTView; break;
668     case OPT_dump_raw_tokens:
669       Opts.ProgramAction = frontend::DumpRawTokens; break;
670     case OPT_dump_tokens:
671       Opts.ProgramAction = frontend::DumpTokens; break;
672     case OPT_S:
673       Opts.ProgramAction = frontend::EmitAssembly; break;
674     case OPT_emit_llvm_bc:
675       Opts.ProgramAction = frontend::EmitBC; break;
676     case OPT_emit_html:
677       Opts.ProgramAction = frontend::EmitHTML; break;
678     case OPT_emit_llvm:
679       Opts.ProgramAction = frontend::EmitLLVM; break;
680     case OPT_emit_llvm_only:
681       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
682     case OPT_emit_codegen_only:
683       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
684     case OPT_emit_obj:
685       Opts.ProgramAction = frontend::EmitObj; break;
686     case OPT_fixit_EQ:
687       Opts.FixItSuffix = A->getValue();
688       // fall-through!
689     case OPT_fixit:
690       Opts.ProgramAction = frontend::FixIt; break;
691     case OPT_emit_module:
692       Opts.ProgramAction = frontend::GenerateModule; break;
693     case OPT_emit_pch:
694       Opts.ProgramAction = frontend::GeneratePCH; break;
695     case OPT_emit_pth:
696       Opts.ProgramAction = frontend::GeneratePTH; break;
697     case OPT_init_only:
698       Opts.ProgramAction = frontend::InitOnly; break;
699     case OPT_fsyntax_only:
700       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
701     case OPT_module_file_info:
702       Opts.ProgramAction = frontend::ModuleFileInfo; break;
703     case OPT_print_decl_contexts:
704       Opts.ProgramAction = frontend::PrintDeclContext; break;
705     case OPT_print_preamble:
706       Opts.ProgramAction = frontend::PrintPreamble; break;
707     case OPT_E:
708       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
709     case OPT_rewrite_macros:
710       Opts.ProgramAction = frontend::RewriteMacros; break;
711     case OPT_rewrite_objc:
712       Opts.ProgramAction = frontend::RewriteObjC; break;
713     case OPT_rewrite_test:
714       Opts.ProgramAction = frontend::RewriteTest; break;
715     case OPT_analyze:
716       Opts.ProgramAction = frontend::RunAnalysis; break;
717     case OPT_migrate:
718       Opts.ProgramAction = frontend::MigrateSource; break;
719     case OPT_Eonly:
720       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
721     }
722   }
723 
724   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
725     Opts.Plugins.push_back(A->getValue(0));
726     Opts.ProgramAction = frontend::PluginAction;
727     Opts.ActionName = A->getValue();
728 
729     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
730            end = Args.filtered_end(); it != end; ++it) {
731       if ((*it)->getValue(0) == Opts.ActionName)
732         Opts.PluginArgs.push_back((*it)->getValue(1));
733     }
734   }
735 
736   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
737   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
738   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
739     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
740            end = Args.filtered_end(); it != end; ++it) {
741       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
742         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
743     }
744   }
745 
746   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
747     Opts.CodeCompletionAt =
748       ParsedSourceLocation::FromString(A->getValue());
749     if (Opts.CodeCompletionAt.FileName.empty())
750       Diags.Report(diag::err_drv_invalid_value)
751         << A->getAsString(Args) << A->getValue();
752   }
753   Opts.DisableFree = Args.hasArg(OPT_disable_free);
754 
755   Opts.OutputFile = Args.getLastArgValue(OPT_o);
756   Opts.Plugins = Args.getAllArgValues(OPT_load);
757   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
758   Opts.ShowHelp = Args.hasArg(OPT_help);
759   Opts.ShowStats = Args.hasArg(OPT_print_stats);
760   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
761   Opts.ShowVersion = Args.hasArg(OPT_version);
762   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
763   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
764   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
765   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
766   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
767   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
768   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
769   Opts.ASTDumpLookups = Args.hasArg(OPT_ast_dump_lookups);
770   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
771   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
772 
773   Opts.CodeCompleteOpts.IncludeMacros
774     = Args.hasArg(OPT_code_completion_macros);
775   Opts.CodeCompleteOpts.IncludeCodePatterns
776     = Args.hasArg(OPT_code_completion_patterns);
777   Opts.CodeCompleteOpts.IncludeGlobals
778     = !Args.hasArg(OPT_no_code_completion_globals);
779   Opts.CodeCompleteOpts.IncludeBriefComments
780     = Args.hasArg(OPT_code_completion_brief_comments);
781 
782   Opts.OverrideRecordLayoutsFile
783     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
784   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
785                                      OPT_arcmt_modify,
786                                      OPT_arcmt_migrate)) {
787     switch (A->getOption().getID()) {
788     default:
789       llvm_unreachable("missed a case");
790     case OPT_arcmt_check:
791       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
792       break;
793     case OPT_arcmt_modify:
794       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
795       break;
796     case OPT_arcmt_migrate:
797       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
798       break;
799     }
800   }
801   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
802   Opts.ARCMTMigrateReportOut
803     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
804   Opts.ARCMTMigrateEmitARCErrors
805     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
806 
807   if (Args.hasArg(OPT_objcmt_migrate_literals))
808     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
809   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
810     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
811   if (Args.hasArg(OPT_objcmt_migrate_property))
812     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Property;
813   if (Args.hasArg(OPT_objcmt_migrate_readonly_property))
814     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadonlyProperty;
815   if (Args.hasArg(OPT_objcmt_migrate_readwrite_property))
816     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReadwriteProperty;
817   if (Args.hasArg(OPT_objcmt_migrate_annotation))
818     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Annotation;
819   if (Args.hasArg(OPT_objcmt_returns_innerpointer_property))
820     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ReturnsInnerPointerProperty;
821   if (Args.hasArg(OPT_objcmt_migrate_instancetype))
822     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Instancetype;
823   if (Args.hasArg(OPT_objcmt_migrate_nsmacros))
824     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
825   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
826     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
827   if (Args.hasArg(OPT_objcmt_atomic_property))
828     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
829   if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
830     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
831   if (Args.hasArg(OPT_objcmt_migrate_designated_init))
832     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_DesignatedInitializer;
833   if (Args.hasArg(OPT_objcmt_migrate_all))
834     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;
835 
836   Opts.ObjCMTWhiteListPath = Args.getLastArgValue(OPT_objcmt_whitelist_dir_path);
837 
838   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
839       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
840     Diags.Report(diag::err_drv_argument_not_allowed_with)
841       << "ARC migration" << "ObjC migration";
842   }
843 
844   InputKind DashX = IK_None;
845   if (const Arg *A = Args.getLastArg(OPT_x)) {
846     DashX = llvm::StringSwitch<InputKind>(A->getValue())
847       .Case("c", IK_C)
848       .Case("cl", IK_OpenCL)
849       .Case("cuda", IK_CUDA)
850       .Case("c++", IK_CXX)
851       .Case("objective-c", IK_ObjC)
852       .Case("objective-c++", IK_ObjCXX)
853       .Case("cpp-output", IK_PreprocessedC)
854       .Case("assembler-with-cpp", IK_Asm)
855       .Case("c++-cpp-output", IK_PreprocessedCXX)
856       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
857       .Case("objc-cpp-output", IK_PreprocessedObjC)
858       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
859       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
860       .Case("c-header", IK_C)
861       .Case("cl-header", IK_OpenCL)
862       .Case("objective-c-header", IK_ObjC)
863       .Case("c++-header", IK_CXX)
864       .Case("objective-c++-header", IK_ObjCXX)
865       .Cases("ast", "pcm", IK_AST)
866       .Case("ir", IK_LLVM_IR)
867       .Default(IK_None);
868     if (DashX == IK_None)
869       Diags.Report(diag::err_drv_invalid_value)
870         << A->getAsString(Args) << A->getValue();
871   }
872 
873   // '-' is the default input if none is given.
874   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
875   Opts.Inputs.clear();
876   if (Inputs.empty())
877     Inputs.push_back("-");
878   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
879     InputKind IK = DashX;
880     if (IK == IK_None) {
881       IK = FrontendOptions::getInputKindForExtension(
882         StringRef(Inputs[i]).rsplit('.').second);
883       // FIXME: Remove this hack.
884       if (i == 0)
885         DashX = IK;
886     }
887     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
888   }
889 
890   return DashX;
891 }
892 
893 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
894                                                  void *MainAddr) {
895   SmallString<128> P(llvm::sys::fs::getMainExecutable(Argv0, MainAddr));
896 
897   if (!P.empty()) {
898     llvm::sys::path::remove_filename(P); // Remove /clang from foo/bin/clang
899     llvm::sys::path::remove_filename(P); // Remove /bin   from foo/bin
900 
901     // Get foo/lib/clang/<version>/include
902     llvm::sys::path::append(P, "lib", "clang", CLANG_VERSION_STRING);
903   }
904 
905   return P.str();
906 }
907 
908 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
909   using namespace options;
910   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
911   Opts.Verbose = Args.hasArg(OPT_v);
912   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
913   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
914   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
915   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
916     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
917   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
918   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
919   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
920   // -fmodules implies -fmodule-maps
921   Opts.ModuleMaps = Args.hasArg(OPT_fmodule_maps) || Args.hasArg(OPT_fmodules);
922   Opts.ModuleCachePruneInterval =
923       getLastArgIntValue(Args, OPT_fmodules_prune_interval, 7 * 24 * 60 * 60);
924   Opts.ModuleCachePruneAfter =
925       getLastArgIntValue(Args, OPT_fmodules_prune_after, 31 * 24 * 60 * 60);
926   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
927                     ie = Args.filtered_end();
928        it != ie; ++it) {
929     StringRef MacroDef = (*it)->getValue();
930     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
931   }
932   std::vector<std::string> ModuleMapFiles =
933       Args.getAllArgValues(OPT_fmodule_map_file);
934   Opts.ModuleMapFiles.insert(ModuleMapFiles.begin(), ModuleMapFiles.end());
935 
936   // Add -I..., -F..., and -index-header-map options in order.
937   bool IsIndexHeaderMap = false;
938   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
939                                              OPT_index_header_map),
940        ie = Args.filtered_end(); it != ie; ++it) {
941     if ((*it)->getOption().matches(OPT_index_header_map)) {
942       // -index-header-map applies to the next -I or -F.
943       IsIndexHeaderMap = true;
944       continue;
945     }
946 
947     frontend::IncludeDirGroup Group
948       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
949 
950     Opts.AddPath((*it)->getValue(), Group,
951                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
952     IsIndexHeaderMap = false;
953   }
954 
955   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
956   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
957   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
958                                              OPT_iwithprefixbefore),
959          ie = Args.filtered_end(); it != ie; ++it) {
960     const Arg *A = *it;
961     if (A->getOption().matches(OPT_iprefix))
962       Prefix = A->getValue();
963     else if (A->getOption().matches(OPT_iwithprefix))
964       Opts.AddPath(Prefix.str() + A->getValue(),
965                    frontend::After, false, true);
966     else
967       Opts.AddPath(Prefix.str() + A->getValue(),
968                    frontend::Angled, false, true);
969   }
970 
971   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
972          ie = Args.filtered_end(); it != ie; ++it)
973     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
974   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
975          ie = Args.filtered_end(); it != ie; ++it)
976     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
977   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
978          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
979     Opts.AddPath((*it)->getValue(), frontend::System, false,
980                  !(*it)->getOption().matches(OPT_iwithsysroot));
981   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
982          ie = Args.filtered_end(); it != ie; ++it)
983     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
984 
985   // Add the paths for the various language specific isystem flags.
986   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
987        ie = Args.filtered_end(); it != ie; ++it)
988     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
989   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
990        ie = Args.filtered_end(); it != ie; ++it)
991     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
992   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
993        ie = Args.filtered_end(); it != ie; ++it)
994     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
995   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
996        ie = Args.filtered_end(); it != ie; ++it)
997     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
998 
999   // Add the internal paths from a driver that detects standard include paths.
1000   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
1001                                             OPT_internal_externc_isystem),
1002                     E = Args.filtered_end();
1003        I != E; ++I) {
1004     frontend::IncludeDirGroup Group = frontend::System;
1005     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
1006       Group = frontend::ExternCSystem;
1007     Opts.AddPath((*I)->getValue(), Group, false, true);
1008   }
1009 
1010   // Add the path prefixes which are implicitly treated as being system headers.
1011   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
1012                                             OPT_ino_system_prefix),
1013                     E = Args.filtered_end();
1014        I != E; ++I)
1015     Opts.AddSystemHeaderPrefix((*I)->getValue(),
1016                                (*I)->getOption().matches(OPT_isystem_prefix));
1017 }
1018 
1019 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
1020                                          LangStandard::Kind LangStd) {
1021   // Set some properties which depend solely on the input kind; it would be nice
1022   // to move these to the language standard, and have the driver resolve the
1023   // input kind + language standard.
1024   if (IK == IK_Asm) {
1025     Opts.AsmPreprocessor = 1;
1026   } else if (IK == IK_ObjC ||
1027              IK == IK_ObjCXX ||
1028              IK == IK_PreprocessedObjC ||
1029              IK == IK_PreprocessedObjCXX) {
1030     Opts.ObjC1 = Opts.ObjC2 = 1;
1031   }
1032 
1033   if (LangStd == LangStandard::lang_unspecified) {
1034     // Based on the base language, pick one.
1035     switch (IK) {
1036     case IK_None:
1037     case IK_AST:
1038     case IK_LLVM_IR:
1039       llvm_unreachable("Invalid input kind!");
1040     case IK_OpenCL:
1041       LangStd = LangStandard::lang_opencl;
1042       break;
1043     case IK_CUDA:
1044       LangStd = LangStandard::lang_cuda;
1045       break;
1046     case IK_Asm:
1047     case IK_C:
1048     case IK_PreprocessedC:
1049     case IK_ObjC:
1050     case IK_PreprocessedObjC:
1051       LangStd = LangStandard::lang_gnu99;
1052       break;
1053     case IK_CXX:
1054     case IK_PreprocessedCXX:
1055     case IK_ObjCXX:
1056     case IK_PreprocessedObjCXX:
1057       LangStd = LangStandard::lang_gnucxx98;
1058       break;
1059     }
1060   }
1061 
1062   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1063   Opts.LineComment = Std.hasLineComments();
1064   Opts.C99 = Std.isC99();
1065   Opts.C11 = Std.isC11();
1066   Opts.CPlusPlus = Std.isCPlusPlus();
1067   Opts.CPlusPlus11 = Std.isCPlusPlus11();
1068   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
1069   Opts.Digraphs = Std.hasDigraphs();
1070   Opts.GNUMode = Std.isGNUMode();
1071   Opts.GNUInline = !Std.isC99();
1072   Opts.HexFloats = Std.hasHexFloats();
1073   Opts.ImplicitInt = Std.hasImplicitInt();
1074 
1075   // Set OpenCL Version.
1076   if (LangStd == LangStandard::lang_opencl) {
1077     Opts.OpenCL = 1;
1078     Opts.OpenCLVersion = 100;
1079   }
1080   else if (LangStd == LangStandard::lang_opencl11) {
1081       Opts.OpenCL = 1;
1082       Opts.OpenCLVersion = 110;
1083   }
1084   else if (LangStd == LangStandard::lang_opencl12) {
1085     Opts.OpenCL = 1;
1086     Opts.OpenCLVersion = 120;
1087   }
1088 
1089   // OpenCL has some additional defaults.
1090   if (Opts.OpenCL) {
1091     Opts.AltiVec = 0;
1092     Opts.CXXOperatorNames = 1;
1093     Opts.LaxVectorConversions = 0;
1094     Opts.DefaultFPContract = 1;
1095     Opts.NativeHalfType = 1;
1096   }
1097 
1098   if (LangStd == LangStandard::lang_cuda)
1099     Opts.CUDA = 1;
1100 
1101   // OpenCL and C++ both have bool, true, false keywords.
1102   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1103 
1104   // C++ has wchar_t keyword.
1105   Opts.WChar = Opts.CPlusPlus;
1106 
1107   Opts.GNUKeywords = Opts.GNUMode;
1108   Opts.CXXOperatorNames = Opts.CPlusPlus;
1109 
1110   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1111   // is specified, or -std is set to a conforming mode.
1112   Opts.Trigraphs = !Opts.GNUMode;
1113 
1114   Opts.DollarIdents = !Opts.AsmPreprocessor;
1115 
1116   // C++1y onwards has sized global deallocation functions.
1117   Opts.SizedDeallocation = Opts.CPlusPlus1y;
1118 }
1119 
1120 /// Attempt to parse a visibility value out of the given argument.
1121 static Visibility parseVisibility(Arg *arg, ArgList &args,
1122                                   DiagnosticsEngine &diags) {
1123   StringRef value = arg->getValue();
1124   if (value == "default") {
1125     return DefaultVisibility;
1126   } else if (value == "hidden") {
1127     return HiddenVisibility;
1128   } else if (value == "protected") {
1129     // FIXME: diagnose if target does not support protected visibility
1130     return ProtectedVisibility;
1131   }
1132 
1133   diags.Report(diag::err_drv_invalid_value)
1134     << arg->getAsString(args) << value;
1135   return DefaultVisibility;
1136 }
1137 
1138 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1139                           DiagnosticsEngine &Diags) {
1140   // FIXME: Cleanup per-file based stuff.
1141   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1142   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1143     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1144 #define LANGSTANDARD(id, name, desc, features) \
1145       .Case(name, LangStandard::lang_##id)
1146 #include "clang/Frontend/LangStandards.def"
1147       .Default(LangStandard::lang_unspecified);
1148     if (LangStd == LangStandard::lang_unspecified)
1149       Diags.Report(diag::err_drv_invalid_value)
1150         << A->getAsString(Args) << A->getValue();
1151     else {
1152       // Valid standard, check to make sure language and standard are
1153       // compatible.
1154       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1155       switch (IK) {
1156       case IK_C:
1157       case IK_ObjC:
1158       case IK_PreprocessedC:
1159       case IK_PreprocessedObjC:
1160         if (!(Std.isC89() || Std.isC99()))
1161           Diags.Report(diag::err_drv_argument_not_allowed_with)
1162             << A->getAsString(Args) << "C/ObjC";
1163         break;
1164       case IK_CXX:
1165       case IK_ObjCXX:
1166       case IK_PreprocessedCXX:
1167       case IK_PreprocessedObjCXX:
1168         if (!Std.isCPlusPlus())
1169           Diags.Report(diag::err_drv_argument_not_allowed_with)
1170             << A->getAsString(Args) << "C++/ObjC++";
1171         break;
1172       case IK_OpenCL:
1173         if (!Std.isC99())
1174           Diags.Report(diag::err_drv_argument_not_allowed_with)
1175             << A->getAsString(Args) << "OpenCL";
1176         break;
1177       case IK_CUDA:
1178         if (!Std.isCPlusPlus())
1179           Diags.Report(diag::err_drv_argument_not_allowed_with)
1180             << A->getAsString(Args) << "CUDA";
1181         break;
1182       default:
1183         break;
1184       }
1185     }
1186   }
1187 
1188   // -cl-std only applies for OpenCL language standards.
1189   // Override the -std option in this case.
1190   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1191     LangStandard::Kind OpenCLLangStd
1192     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1193     .Case("CL", LangStandard::lang_opencl)
1194     .Case("CL1.1", LangStandard::lang_opencl11)
1195     .Case("CL1.2", LangStandard::lang_opencl12)
1196     .Default(LangStandard::lang_unspecified);
1197 
1198     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1199       Diags.Report(diag::err_drv_invalid_value)
1200       << A->getAsString(Args) << A->getValue();
1201     }
1202     else
1203       LangStd = OpenCLLangStd;
1204   }
1205 
1206   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1207 
1208   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1209   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1210   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1211   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1212   // name, as it doesn't seem a useful distinction.
1213   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1214                                   Opts.GNUKeywords);
1215 
1216   if (Args.hasArg(OPT_fno_operator_names))
1217     Opts.CXXOperatorNames = 0;
1218 
1219   if (Opts.ObjC1) {
1220     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1221       StringRef value = arg->getValue();
1222       if (Opts.ObjCRuntime.tryParse(value))
1223         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1224     }
1225 
1226     if (Args.hasArg(OPT_fobjc_gc_only))
1227       Opts.setGC(LangOptions::GCOnly);
1228     else if (Args.hasArg(OPT_fobjc_gc))
1229       Opts.setGC(LangOptions::HybridGC);
1230     else if (Args.hasArg(OPT_fobjc_arc)) {
1231       Opts.ObjCAutoRefCount = 1;
1232       if (!Opts.ObjCRuntime.allowsARC())
1233         Diags.Report(diag::err_arc_unsupported_on_runtime);
1234 
1235       // Only set ObjCARCWeak if ARC is enabled.
1236       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1237         Opts.ObjCARCWeak = 1;
1238       else
1239         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1240     }
1241 
1242     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1243       Opts.ObjCInferRelatedResultType = 0;
1244 
1245     if (Args.hasArg(OPT_fobjc_subscripting_legacy_runtime))
1246       Opts.ObjCSubscriptingLegacyRuntime =
1247         (Opts.ObjCRuntime.getKind() == ObjCRuntime::FragileMacOSX);
1248   }
1249 
1250   if (Args.hasArg(OPT_fgnu89_inline))
1251     Opts.GNUInline = 1;
1252 
1253   if (Args.hasArg(OPT_fapple_kext)) {
1254     if (!Opts.CPlusPlus)
1255       Diags.Report(diag::warn_c_kext);
1256     else
1257       Opts.AppleKext = 1;
1258   }
1259 
1260   if (Args.hasArg(OPT_print_ivar_layout))
1261     Opts.ObjCGCBitmapPrint = 1;
1262   if (Args.hasArg(OPT_fno_constant_cfstrings))
1263     Opts.NoConstantCFStrings = 1;
1264 
1265   if (Args.hasArg(OPT_faltivec))
1266     Opts.AltiVec = 1;
1267 
1268   if (Args.hasArg(OPT_pthread))
1269     Opts.POSIXThreads = 1;
1270 
1271   // The value-visibility mode defaults to "default".
1272   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1273     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1274   } else {
1275     Opts.setValueVisibilityMode(DefaultVisibility);
1276   }
1277 
1278   // The type-visibility mode defaults to the value-visibility mode.
1279   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1280     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1281   } else {
1282     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1283   }
1284 
1285   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1286     Opts.InlineVisibilityHidden = 1;
1287 
1288   if (Args.hasArg(OPT_ftrapv)) {
1289     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1290     // Set the handler, if one is specified.
1291     Opts.OverflowHandler =
1292         Args.getLastArgValue(OPT_ftrapv_handler);
1293   }
1294   else if (Args.hasArg(OPT_fwrapv))
1295     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1296 
1297   if (Args.hasArg(OPT_trigraphs))
1298     Opts.Trigraphs = 1;
1299 
1300   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1301                                    OPT_fno_dollars_in_identifiers,
1302                                    Opts.DollarIdents);
1303   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1304   Opts.MSVCCompat = Args.hasArg(OPT_fms_compatibility);
1305   Opts.MicrosoftExt = Opts.MSVCCompat || Args.hasArg(OPT_fms_extensions);
1306   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1307   Opts.MSCVersion = getLastArgIntValue(Args, OPT_fmsc_version, 0, Diags);
1308   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1309   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1310   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1311                                    Opts.ConstStrings);
1312   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1313     Opts.LaxVectorConversions = 0;
1314   if (Args.hasArg(OPT_fno_threadsafe_statics))
1315     Opts.ThreadsafeStatics = 0;
1316   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1317   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1318   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1319   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1320   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1321 
1322   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1323   Opts.Blocks = Args.hasArg(OPT_fblocks);
1324   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1325   Opts.Modules = Args.hasArg(OPT_fmodules);
1326   Opts.ModulesDeclUse = Args.hasArg(OPT_fmodules_decluse);
1327   Opts.CharIsSigned = Opts.OpenCL || !Args.hasArg(OPT_fno_signed_char);
1328   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1329   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1330   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1331   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1332   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1333   Opts.NoMathBuiltin = Args.hasArg(OPT_fno_math_builtin);
1334   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1335   Opts.SizedDeallocation |= Args.hasArg(OPT_fsized_deallocation);
1336   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1337   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1338   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1339   Opts.MathErrno = !Opts.OpenCL && Args.hasArg(OPT_fmath_errno);
1340   Opts.InstantiationDepth =
1341       getLastArgIntValue(Args, OPT_ftemplate_depth, 256, Diags);
1342   Opts.ArrowDepth =
1343       getLastArgIntValue(Args, OPT_foperator_arrow_depth, 256, Diags);
1344   Opts.ConstexprCallDepth =
1345       getLastArgIntValue(Args, OPT_fconstexpr_depth, 512, Diags);
1346   Opts.ConstexprStepLimit =
1347       getLastArgIntValue(Args, OPT_fconstexpr_steps, 1048576, Diags);
1348   Opts.BracketDepth = getLastArgIntValue(Args, OPT_fbracket_depth, 256, Diags);
1349   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1350   Opts.NumLargeByValueCopy =
1351       getLastArgIntValue(Args, OPT_Wlarge_by_value_copy_EQ, 0, Diags);
1352   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1353   Opts.ObjCConstantStringClass =
1354     Args.getLastArgValue(OPT_fconstant_string_class);
1355   Opts.ObjCDefaultSynthProperties =
1356     !Args.hasArg(OPT_disable_objc_default_synthesize_properties);
1357   Opts.EncodeExtendedBlockSig =
1358     Args.hasArg(OPT_fencode_extended_block_signature);
1359   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1360   Opts.PackStruct = getLastArgIntValue(Args, OPT_fpack_struct_EQ, 0, Diags);
1361   Opts.PICLevel = getLastArgIntValue(Args, OPT_pic_level, 0, Diags);
1362   Opts.PIELevel = getLastArgIntValue(Args, OPT_pie_level, 0, Diags);
1363   Opts.Static = Args.hasArg(OPT_static_define);
1364   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1365   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1366                         || Args.hasArg(OPT_fdump_record_layouts);
1367   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1368   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1369   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1370   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1371   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1372   Opts.MRTD = Args.hasArg(OPT_mrtd);
1373   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1374   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1375   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1376   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1377   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1378   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1379   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1380   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1381 
1382   if (Arg *A = Args.getLastArg(OPT_faddress_space_map_mangling_EQ)) {
1383     switch (llvm::StringSwitch<unsigned>(A->getValue())
1384       .Case("target", LangOptions::ASMM_Target)
1385       .Case("no", LangOptions::ASMM_Off)
1386       .Case("yes", LangOptions::ASMM_On)
1387       .Default(255)) {
1388     default:
1389       Diags.Report(diag::err_drv_invalid_value)
1390         << "-faddress-space-map-mangling=" << A->getValue();
1391       break;
1392     case LangOptions::ASMM_Target:
1393       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Target);
1394       break;
1395     case LangOptions::ASMM_On:
1396       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_On);
1397       break;
1398     case LangOptions::ASMM_Off:
1399       Opts.setAddressSpaceMapMangling(LangOptions::ASMM_Off);
1400       break;
1401     }
1402   }
1403 
1404   // Check if -fopenmp is specified.
1405   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1406 
1407   // Record whether the __DEPRECATED define was requested.
1408   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1409                                  OPT_fno_deprecated_macro,
1410                                  Opts.Deprecated);
1411 
1412   // FIXME: Eliminate this dependency.
1413   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1414        OptSize = getOptimizationLevelSize(Args);
1415   Opts.Optimize = Opt != 0;
1416   Opts.OptimizeSize = OptSize != 0;
1417 
1418   // This is the __NO_INLINE__ define, which just depends on things like the
1419   // optimization level and -fno-inline, not actually whether the backend has
1420   // inlining enabled.
1421   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1422 
1423   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1424   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1425 
1426   Opts.RetainCommentsFromSystemHeaders =
1427       Args.hasArg(OPT_fretain_comments_from_system_headers);
1428 
1429   unsigned SSP = getLastArgIntValue(Args, OPT_stack_protector, 0, Diags);
1430   switch (SSP) {
1431   default:
1432     Diags.Report(diag::err_drv_invalid_value)
1433       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1434     break;
1435   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1436   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1437   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1438   }
1439 
1440   // Parse -fsanitize= arguments.
1441   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1442   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1443     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1444     // efficiently map string values to them. Perform the mapping indirectly:
1445     // convert strings to enumerated values, then switch over the enum to set
1446     // the right bitfield value.
1447     enum Sanitizer {
1448 #define SANITIZER(NAME, ID) \
1449       ID,
1450 #include "clang/Basic/Sanitizers.def"
1451       Unknown
1452     };
1453     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1454 #define SANITIZER(NAME, ID) \
1455               .Case(NAME, ID)
1456 #include "clang/Basic/Sanitizers.def"
1457               .Default(Unknown)) {
1458 #define SANITIZER(NAME, ID) \
1459     case ID: \
1460       Opts.Sanitize.ID = true; \
1461       break;
1462 #include "clang/Basic/Sanitizers.def"
1463 
1464     case Unknown:
1465       Diags.Report(diag::err_drv_invalid_value)
1466         << "-fsanitize=" << Sanitizers[I];
1467       break;
1468     }
1469   }
1470 }
1471 
1472 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1473                                   FileManager &FileMgr,
1474                                   DiagnosticsEngine &Diags) {
1475   using namespace options;
1476   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1477   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1478   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1479       Opts.TokenCache = A->getValue();
1480   else
1481     Opts.TokenCache = Opts.ImplicitPTHInclude;
1482   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1483   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1484   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1485 
1486   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1487   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1488          ie = Args.filtered_end(); it != ie; ++it) {
1489     const Arg *A = *it;
1490     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1491   }
1492 
1493   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1494     StringRef Value(A->getValue());
1495     size_t Comma = Value.find(',');
1496     unsigned Bytes = 0;
1497     unsigned EndOfLine = 0;
1498 
1499     if (Comma == StringRef::npos ||
1500         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1501         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1502       Diags.Report(diag::err_drv_preamble_format);
1503     else {
1504       Opts.PrecompiledPreambleBytes.first = Bytes;
1505       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1506     }
1507   }
1508 
1509   // Add macros from the command line.
1510   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1511          ie = Args.filtered_end(); it != ie; ++it) {
1512     if ((*it)->getOption().matches(OPT_D))
1513       Opts.addMacroDef((*it)->getValue());
1514     else
1515       Opts.addMacroUndef((*it)->getValue());
1516   }
1517 
1518   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1519 
1520   // Add the ordered list of -includes.
1521   for (arg_iterator it = Args.filtered_begin(OPT_include),
1522          ie = Args.filtered_end(); it != ie; ++it) {
1523     const Arg *A = *it;
1524     Opts.Includes.push_back(A->getValue());
1525   }
1526 
1527   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1528          ie = Args.filtered_end(); it != ie; ++it) {
1529     const Arg *A = *it;
1530     Opts.ChainedIncludes.push_back(A->getValue());
1531   }
1532 
1533   // Include 'altivec.h' if -faltivec option present
1534   if (Args.hasArg(OPT_faltivec))
1535     Opts.Includes.push_back("altivec.h");
1536 
1537   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1538          ie = Args.filtered_end(); it != ie; ++it) {
1539     const Arg *A = *it;
1540     std::pair<StringRef,StringRef> Split =
1541       StringRef(A->getValue()).split(';');
1542 
1543     if (Split.second.empty()) {
1544       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1545       continue;
1546     }
1547 
1548     Opts.addRemappedFile(Split.first, Split.second);
1549   }
1550 
1551   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1552     StringRef Name = A->getValue();
1553     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1554       .Case("libc++", ARCXX_libcxx)
1555       .Case("libstdc++", ARCXX_libstdcxx)
1556       .Case("none", ARCXX_nolib)
1557       .Default(~0U);
1558     if (Library == ~0U)
1559       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1560     else
1561       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1562   }
1563 }
1564 
1565 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1566                                         ArgList &Args,
1567                                         frontend::ActionKind Action) {
1568   using namespace options;
1569 
1570   switch (Action) {
1571   case frontend::ASTDeclList:
1572   case frontend::ASTDump:
1573   case frontend::ASTPrint:
1574   case frontend::ASTView:
1575   case frontend::EmitAssembly:
1576   case frontend::EmitBC:
1577   case frontend::EmitHTML:
1578   case frontend::EmitLLVM:
1579   case frontend::EmitLLVMOnly:
1580   case frontend::EmitCodeGenOnly:
1581   case frontend::EmitObj:
1582   case frontend::FixIt:
1583   case frontend::GenerateModule:
1584   case frontend::GeneratePCH:
1585   case frontend::GeneratePTH:
1586   case frontend::ParseSyntaxOnly:
1587   case frontend::ModuleFileInfo:
1588   case frontend::PluginAction:
1589   case frontend::PrintDeclContext:
1590   case frontend::RewriteObjC:
1591   case frontend::RewriteTest:
1592   case frontend::RunAnalysis:
1593   case frontend::MigrateSource:
1594     Opts.ShowCPP = 0;
1595     break;
1596 
1597   case frontend::DumpRawTokens:
1598   case frontend::DumpTokens:
1599   case frontend::InitOnly:
1600   case frontend::PrintPreamble:
1601   case frontend::PrintPreprocessedInput:
1602   case frontend::RewriteMacros:
1603   case frontend::RunPreprocessorOnly:
1604     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1605     break;
1606   }
1607 
1608   Opts.ShowComments = Args.hasArg(OPT_C);
1609   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1610   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1611   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1612   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1613 }
1614 
1615 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1616   using namespace options;
1617   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1618   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1619   Opts.FPMath = Args.getLastArgValue(OPT_mfpmath);
1620   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1621   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1622   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1623 
1624   // Use the default target triple if unspecified.
1625   if (Opts.Triple.empty())
1626     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1627 }
1628 
1629 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1630                                         const char *const *ArgBegin,
1631                                         const char *const *ArgEnd,
1632                                         DiagnosticsEngine &Diags) {
1633   bool Success = true;
1634 
1635   // Parse the arguments.
1636   OwningPtr<OptTable> Opts(createDriverOptTable());
1637   const unsigned IncludedFlagsBitmask = options::CC1Option;
1638   unsigned MissingArgIndex, MissingArgCount;
1639   OwningPtr<InputArgList> Args(
1640     Opts->ParseArgs(ArgBegin, ArgEnd, MissingArgIndex, MissingArgCount,
1641                     IncludedFlagsBitmask));
1642 
1643   // Check for missing argument error.
1644   if (MissingArgCount) {
1645     Diags.Report(diag::err_drv_missing_argument)
1646       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1647     Success = false;
1648   }
1649 
1650   // Issue errors on unknown arguments.
1651   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1652          ie = Args->filtered_end(); it != ie; ++it) {
1653     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1654     Success = false;
1655   }
1656 
1657   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1658   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1659   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1660   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1661             && Success;
1662   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1663   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1664   // FIXME: We shouldn't have to pass the DashX option around here
1665   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1666   ParseTargetArgs(Res.getTargetOpts(), *Args);
1667   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags,
1668                              Res.getTargetOpts()) && Success;
1669   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1670   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1671     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1672     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1673       Res.getLangOpts()->ObjCExceptions = 1;
1674   }
1675   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1676   // PCH file and find the original header name. Remove the need to do that in
1677   // ParsePreprocessorArgs and remove the FileManager
1678   // parameters from the function and the "FileManager.h" #include.
1679   FileManager FileMgr(Res.getFileSystemOpts());
1680   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1681   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1682                               Res.getFrontendOpts().ProgramAction);
1683   return Success;
1684 }
1685 
1686 namespace {
1687 
1688   class ModuleSignature {
1689     SmallVector<uint64_t, 16> Data;
1690     unsigned CurBit;
1691     uint64_t CurValue;
1692 
1693   public:
1694     ModuleSignature() : CurBit(0), CurValue(0) { }
1695 
1696     void add(uint64_t Value, unsigned Bits);
1697     void add(StringRef Value);
1698     void flush();
1699 
1700     llvm::APInt getAsInteger() const;
1701   };
1702 }
1703 
1704 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1705   CurValue |= Value << CurBit;
1706   if (CurBit + NumBits < 64) {
1707     CurBit += NumBits;
1708     return;
1709   }
1710 
1711   // Add the current word.
1712   Data.push_back(CurValue);
1713 
1714   if (CurBit)
1715     CurValue = Value >> (64-CurBit);
1716   else
1717     CurValue = 0;
1718   CurBit = (CurBit+NumBits) & 63;
1719 }
1720 
1721 void ModuleSignature::flush() {
1722   if (CurBit == 0)
1723     return;
1724 
1725   Data.push_back(CurValue);
1726   CurBit = 0;
1727   CurValue = 0;
1728 }
1729 
1730 void ModuleSignature::add(StringRef Value) {
1731   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1732     add(*I, 8);
1733 }
1734 
1735 llvm::APInt ModuleSignature::getAsInteger() const {
1736   return llvm::APInt(Data.size() * 64, Data);
1737 }
1738 
1739 std::string CompilerInvocation::getModuleHash() const {
1740   // Note: For QoI reasons, the things we use as a hash here should all be
1741   // dumped via the -module-info flag.
1742   using llvm::hash_code;
1743   using llvm::hash_value;
1744   using llvm::hash_combine;
1745 
1746   // Start the signature with the compiler version.
1747   // FIXME: We'd rather use something more cryptographically sound than
1748   // CityHash, but this will do for now.
1749   hash_code code = hash_value(getClangFullRepositoryVersion());
1750 
1751   // Extend the signature with the language options
1752 #define LANGOPT(Name, Bits, Default, Description) \
1753    code = hash_combine(code, LangOpts->Name);
1754 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1755   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1756 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1757 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1758 #include "clang/Basic/LangOptions.def"
1759 
1760   // Extend the signature with the target options.
1761   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1762                       TargetOpts->ABI, TargetOpts->LinkerVersion);
1763   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1764     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1765 
1766   // Extend the signature with preprocessor options.
1767   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1768   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1769   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1770 
1771   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1772             I = getPreprocessorOpts().Macros.begin(),
1773          IEnd = getPreprocessorOpts().Macros.end();
1774        I != IEnd; ++I) {
1775     // If we're supposed to ignore this macro for the purposes of modules,
1776     // don't put it into the hash.
1777     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1778       // Check whether we're ignoring this macro.
1779       StringRef MacroDef = I->first;
1780       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1781         continue;
1782     }
1783 
1784     code = hash_combine(code, I->first, I->second);
1785   }
1786 
1787   // Extend the signature with the sysroot.
1788   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1789                       hsOpts.UseStandardSystemIncludes,
1790                       hsOpts.UseStandardCXXIncludes,
1791                       hsOpts.UseLibcxx);
1792 
1793   // Darwin-specific hack: if we have a sysroot, use the contents and
1794   // modification time of
1795   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1796   // as part of the module hash.
1797   if (!hsOpts.Sysroot.empty()) {
1798     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1799     SmallString<128> systemVersionFile;
1800     systemVersionFile += hsOpts.Sysroot;
1801     llvm::sys::path::append(systemVersionFile, "System");
1802     llvm::sys::path::append(systemVersionFile, "Library");
1803     llvm::sys::path::append(systemVersionFile, "CoreServices");
1804     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1805     if (!llvm::MemoryBuffer::getFile(systemVersionFile.str(), buffer)) {
1806       code = hash_combine(code, buffer.get()->getBuffer());
1807 
1808       struct stat statBuf;
1809       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1810         code = hash_combine(code, statBuf.st_mtime);
1811     }
1812   }
1813 
1814   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1815 }
1816 
1817 namespace clang {
1818 
1819 // Declared in clang/Frontend/Utils.h.
1820 int getLastArgIntValue(const ArgList &Args, OptSpecifier Id, int Default,
1821                        DiagnosticsEngine *Diags) {
1822   int Res = Default;
1823   if (Arg *A = Args.getLastArg(Id)) {
1824     if (StringRef(A->getValue()).getAsInteger(10, Res)) {
1825       if (Diags)
1826         Diags->Report(diag::err_drv_invalid_int_value) << A->getAsString(Args)
1827                                                        << A->getValue();
1828     }
1829   }
1830   return Res;
1831 }
1832 
1833 void BuryPointer(const void *Ptr) {
1834   // This function may be called only a small fixed amount of times per each
1835   // invocation, otherwise we do actually have a leak which we want to report.
1836   // If this function is called more than kGraveYardMaxSize times, the pointers
1837   // will not be properly buried and a leak detector will report a leak, which
1838   // is what we want in such case.
1839   static const size_t kGraveYardMaxSize = 16;
1840   LLVM_ATTRIBUTE_UNUSED static const void *GraveYard[kGraveYardMaxSize];
1841   static llvm::sys::cas_flag GraveYardSize;
1842   llvm::sys::cas_flag Idx = llvm::sys::AtomicIncrement(&GraveYardSize) - 1;
1843   if (Idx >= kGraveYardMaxSize)
1844     return;
1845   GraveYard[Idx] = Ptr;
1846 }
1847 }
1848