xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision 0b1f476888c638af45c31bca9fbe3bc8180daa8f)
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/Arg.h"
15 #include "clang/Driver/ArgList.h"
16 #include "clang/Driver/DriverDiagnostic.h"
17 #include "clang/Driver/OptTable.h"
18 #include "clang/Driver/Option.h"
19 #include "clang/Driver/Options.h"
20 #include "clang/Frontend/LangStandard.h"
21 #include "clang/Lex/HeaderSearchOptions.h"
22 #include "clang/Serialization/ASTReader.h"
23 #include "llvm/ADT/Hashing.h"
24 #include "llvm/ADT/OwningPtr.h"
25 #include "llvm/ADT/SmallVector.h"
26 #include "llvm/ADT/StringExtras.h"
27 #include "llvm/ADT/StringSwitch.h"
28 #include "llvm/ADT/Triple.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/Host.h"
31 #include "llvm/Support/Path.h"
32 #include "llvm/Support/system_error.h"
33 #include <sys/stat.h>
34 using namespace clang;
35 
36 //===----------------------------------------------------------------------===//
37 // Initialization.
38 //===----------------------------------------------------------------------===//
39 
40 CompilerInvocationBase::CompilerInvocationBase()
41   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
42     DiagnosticOpts(new DiagnosticOptions()),
43     HeaderSearchOpts(new HeaderSearchOptions()),
44     PreprocessorOpts(new PreprocessorOptions()) {}
45 
46 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
47   : RefCountedBase<CompilerInvocation>(),
48     LangOpts(new LangOptions(*X.getLangOpts())),
49     TargetOpts(new TargetOptions(X.getTargetOpts())),
50     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
51     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
52     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
53 
54 //===----------------------------------------------------------------------===//
55 // Deserialization (from args)
56 //===----------------------------------------------------------------------===//
57 
58 using namespace clang::driver;
59 using namespace clang::driver::options;
60 
61 //
62 
63 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
64                                      DiagnosticsEngine &Diags) {
65   unsigned DefaultOpt = 0;
66   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
67     DefaultOpt = 2;
68 
69   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
70     if (A->getOption().matches(options::OPT_O0))
71       return 0;
72 
73     if (A->getOption().matches(options::OPT_Ofast))
74       return 3;
75 
76     assert (A->getOption().matches(options::OPT_O));
77 
78     StringRef S(A->getValue());
79     if (S == "s" || S == "z" || S.empty())
80       return 2;
81 
82     return Args.getLastArgIntValue(OPT_O, DefaultOpt, Diags);
83   }
84 
85   return DefaultOpt;
86 }
87 
88 static unsigned getOptimizationLevelSize(ArgList &Args) {
89   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
90     if (A->getOption().matches(options::OPT_O)) {
91       switch (A->getValue()[0]) {
92       default:
93         return 0;
94       case 's':
95         return 1;
96       case 'z':
97         return 2;
98       }
99     }
100   }
101   return 0;
102 }
103 
104 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
105   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
106          E = Args.filtered_end(); I != E; ++I) {
107     Arg *A = *I;
108     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
109     // to the warning list. Else, add its value (for the OPT_W case).
110     if (A->getOption().getKind() == Option::FlagClass) {
111       Warnings.push_back(A->getOption().getName().substr(1));
112     } else {
113       for (unsigned Idx = 0, End = A->getNumValues();
114            Idx < End; ++Idx) {
115         StringRef V = A->getValue(Idx);
116         // "-Wl," and such are not warning options.
117         // FIXME: Should be handled by putting these in separate flags.
118         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
119           continue;
120 
121         Warnings.push_back(V);
122       }
123     }
124   }
125 }
126 
127 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
128                               DiagnosticsEngine &Diags) {
129   using namespace options;
130   bool Success = true;
131   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
132     StringRef Name = A->getValue();
133     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
134 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
135       .Case(CMDFLAG, NAME##Model)
136 #include "clang/StaticAnalyzer/Core/Analyses.def"
137       .Default(NumStores);
138     if (Value == NumStores) {
139       Diags.Report(diag::err_drv_invalid_value)
140         << A->getAsString(Args) << Name;
141       Success = false;
142     } else {
143       Opts.AnalysisStoreOpt = Value;
144     }
145   }
146 
147   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
148     StringRef Name = A->getValue();
149     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
150 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
151       .Case(CMDFLAG, NAME##Model)
152 #include "clang/StaticAnalyzer/Core/Analyses.def"
153       .Default(NumConstraints);
154     if (Value == NumConstraints) {
155       Diags.Report(diag::err_drv_invalid_value)
156         << A->getAsString(Args) << Name;
157       Success = false;
158     } else {
159       Opts.AnalysisConstraintsOpt = Value;
160     }
161   }
162 
163   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
164     StringRef Name = A->getValue();
165     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
166 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN, AUTOCREAT) \
167       .Case(CMDFLAG, PD_##NAME)
168 #include "clang/StaticAnalyzer/Core/Analyses.def"
169       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
170     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
171       Diags.Report(diag::err_drv_invalid_value)
172         << A->getAsString(Args) << Name;
173       Success = false;
174     } else {
175       Opts.AnalysisDiagOpt = Value;
176     }
177   }
178 
179   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
180     StringRef Name = A->getValue();
181     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
182 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
183       .Case(CMDFLAG, NAME)
184 #include "clang/StaticAnalyzer/Core/Analyses.def"
185       .Default(NumPurgeModes);
186     if (Value == NumPurgeModes) {
187       Diags.Report(diag::err_drv_invalid_value)
188         << A->getAsString(Args) << Name;
189       Success = false;
190     } else {
191       Opts.AnalysisPurgeOpt = Value;
192     }
193   }
194 
195   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
196     StringRef Name = A->getValue();
197     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
198 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
199       .Case(CMDFLAG, NAME)
200 #include "clang/StaticAnalyzer/Core/Analyses.def"
201       .Default(NumInliningModes);
202     if (Value == NumInliningModes) {
203       Diags.Report(diag::err_drv_invalid_value)
204         << A->getAsString(Args) << Name;
205       Success = false;
206     } else {
207       Opts.InliningMode = Value;
208     }
209   }
210 
211   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
212   Opts.visualizeExplodedGraphWithGraphViz =
213     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
214   Opts.visualizeExplodedGraphWithUbiGraph =
215     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
216   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
217   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
218   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
219   Opts.AnalyzeNestedBlocks =
220     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
221   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
222   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
223   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
224   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
225   Opts.maxBlockVisitOnPath = Args.getLastArgIntValue(OPT_analyzer_max_loop, 4, Diags);
226   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
227   Opts.InlineMaxStackDepth =
228     Args.getLastArgIntValue(OPT_analyzer_inline_max_stack_depth,
229                             Opts.InlineMaxStackDepth, Diags);
230 
231   Opts.CheckersControlList.clear();
232   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
233                                              OPT_analyzer_disable_checker),
234          ie = Args.filtered_end(); it != ie; ++it) {
235     const Arg *A = *it;
236     A->claim();
237     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
238     // We can have a list of comma separated checker names, e.g:
239     // '-analyzer-checker=cocoa,unix'
240     StringRef checkerList = A->getValue();
241     SmallVector<StringRef, 4> checkers;
242     checkerList.split(checkers, ",");
243     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
244       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
245   }
246 
247   // Go through the analyzer configuration options.
248   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
249        ie = Args.filtered_end(); it != ie; ++it) {
250     const Arg *A = *it;
251     A->claim();
252     // We can have a list of comma separated config names, e.g:
253     // '-analyzer-config key1=val1,key2=val2'
254     StringRef configList = A->getValue();
255     SmallVector<StringRef, 4> configVals;
256     configList.split(configVals, ",");
257     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
258       StringRef key, val;
259       llvm::tie(key, val) = configVals[i].split("=");
260       if (val.empty()) {
261         Diags.Report(SourceLocation(),
262                      diag::err_analyzer_config_no_value) << configVals[i];
263         Success = false;
264         break;
265       }
266       if (val.find('=') != StringRef::npos) {
267         Diags.Report(SourceLocation(),
268                      diag::err_analyzer_config_multiple_values)
269           << configVals[i];
270         Success = false;
271         break;
272       }
273       Opts.Config[key] = val;
274     }
275   }
276 
277   return Success;
278 }
279 
280 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
281   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
282   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
283   return true;
284 }
285 
286 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
287   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
288   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
289 }
290 
291 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
292                              DiagnosticsEngine &Diags) {
293   using namespace options;
294   bool Success = true;
295 
296   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
297   if (OptLevel > 3) {
298     Diags.Report(diag::err_drv_invalid_value)
299       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
300     OptLevel = 3;
301     Success = false;
302   }
303   Opts.OptimizationLevel = OptLevel;
304 
305   // We must always run at least the always inlining pass.
306   Opts.setInlining(
307     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
308                                  : CodeGenOptions::OnlyAlwaysInlining);
309   // -fno-inline-functions overrides OptimizationLevel > 1.
310   Opts.NoInline = Args.hasArg(OPT_fno_inline);
311   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
312                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
313 
314   if (Args.hasArg(OPT_gline_tables_only)) {
315     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
316   } else if (Args.hasArg(OPT_g_Flag)) {
317     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
318       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
319     else
320       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
321   }
322   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
323   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
324 
325   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
326   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
327   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
328   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
329     OPT_fuse_register_sized_bitfield_access);
330   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
331   Opts.StructPathTBAA = Args.hasArg(OPT_struct_path_tbaa);
332   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
333   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
334   Opts.NoCommon = Args.hasArg(OPT_fno_common);
335   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
336   Opts.OptimizeSize = getOptimizationLevelSize(Args);
337   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
338                             Args.hasArg(OPT_ffreestanding));
339   Opts.UnrollLoops = Args.hasArg(OPT_funroll_loops) ||
340                      (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize);
341 
342   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
343   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
344   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
345   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
346   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
347   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
348   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
349   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
350   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
351   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
352   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
353   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
354   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
355   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
356   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
357                        Args.hasArg(OPT_cl_finite_math_only)||
358                        Args.hasArg(OPT_cl_fast_relaxed_math));
359   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
360                        Args.hasArg(OPT_cl_finite_math_only)||
361                        Args.hasArg(OPT_cl_fast_relaxed_math));
362   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
363   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
364   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);
365   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
366   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
367   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
368   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
369   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
370   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
371   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
372   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
373   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
374   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
375   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
376                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
377                       Args.hasArg(OPT_cl_fast_relaxed_math);
378   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
379   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
380   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
381   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
382 
383   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
384   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
385 
386   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
387   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
388   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
389 
390   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
391   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
392   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
393   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
394   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
395     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
396     Opts.CoverageNoFunctionNamesInData =
397         Args.hasArg(OPT_coverage_no_function_names_in_data);
398     if (Args.hasArg(OPT_coverage_version_EQ)) {
399       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
400       if (CoverageVersion.size() != 4) {
401         Diags.Report(diag::err_drv_invalid_value)
402             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
403             << CoverageVersion;
404       } else {
405         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
406       }
407     }
408   }
409 
410   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
411   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
412   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
413   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
414   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
415   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
416   Opts.SanitizeMemoryTrackOrigins =
417     Args.hasArg(OPT_fsanitize_memory_track_origins);
418   Opts.SanitizeAddressZeroBaseShadow =
419     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
420   Opts.SanitizeUndefinedTrapOnError =
421     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
422   Opts.SSPBufferSize =
423     Args.getLastArgIntValue(OPT_stack_protector_buffer_size, 8, Diags);
424   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
425   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
426     StringRef Val = A->getValue();
427     unsigned StackAlignment = Opts.StackAlignment;
428     Val.getAsInteger(10, StackAlignment);
429     Opts.StackAlignment = StackAlignment;
430   }
431 
432   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
433     StringRef Name = A->getValue();
434     unsigned Method = llvm::StringSwitch<unsigned>(Name)
435       .Case("legacy", CodeGenOptions::Legacy)
436       .Case("non-legacy", CodeGenOptions::NonLegacy)
437       .Case("mixed", CodeGenOptions::Mixed)
438       .Default(~0U);
439     if (Method == ~0U) {
440       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
441       Success = false;
442     } else {
443       Opts.setObjCDispatchMethod(
444         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
445     }
446   }
447 
448   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
449     StringRef Name = A->getValue();
450     unsigned Model = llvm::StringSwitch<unsigned>(Name)
451         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
452         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
453         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
454         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
455         .Default(~0U);
456     if (Model == ~0U) {
457       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
458       Success = false;
459     } else {
460       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
461     }
462   }
463 
464   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
465     StringRef Val = A->getValue();
466     if (Val == "fast")
467       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
468     else if (Val == "on")
469       Opts.setFPContractMode(CodeGenOptions::FPC_On);
470     else if (Val == "off")
471       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
472     else
473       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
474   }
475 
476   return Success;
477 }
478 
479 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
480                                       ArgList &Args) {
481   using namespace options;
482   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
483   Opts.Targets = Args.getAllArgValues(OPT_MT);
484   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
485   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
486   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
487   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
488   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
489   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
490 }
491 
492 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
493                                 DiagnosticsEngine *Diags) {
494   using namespace options;
495   bool Success = true;
496 
497   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
498   Opts.DiagnosticSerializationFile =
499     Args.getLastArgValue(OPT_diagnostic_serialized_file);
500   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
501   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
502   Opts.Pedantic = Args.hasArg(OPT_pedantic);
503   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
504   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
505   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
506   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
507                                  OPT_fno_show_column,
508                                  /*Default=*/true);
509   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
510   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
511   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
512 
513   // Default behavior is to not to show note include stacks.
514   Opts.ShowNoteIncludeStack = false;
515   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
516                                OPT_fno_diagnostics_show_note_include_stack))
517     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
518       Opts.ShowNoteIncludeStack = true;
519 
520   StringRef ShowOverloads =
521     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
522   if (ShowOverloads == "best")
523     Opts.setShowOverloads(Ovl_Best);
524   else if (ShowOverloads == "all")
525     Opts.setShowOverloads(Ovl_All);
526   else {
527     Success = false;
528     if (Diags)
529       Diags->Report(diag::err_drv_invalid_value)
530       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
531       << ShowOverloads;
532   }
533 
534   StringRef ShowCategory =
535     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
536   if (ShowCategory == "none")
537     Opts.ShowCategories = 0;
538   else if (ShowCategory == "id")
539     Opts.ShowCategories = 1;
540   else if (ShowCategory == "name")
541     Opts.ShowCategories = 2;
542   else {
543     Success = false;
544     if (Diags)
545       Diags->Report(diag::err_drv_invalid_value)
546       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
547       << ShowCategory;
548   }
549 
550   StringRef Format =
551     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
552   if (Format == "clang")
553     Opts.setFormat(DiagnosticOptions::Clang);
554   else if (Format == "msvc")
555     Opts.setFormat(DiagnosticOptions::Msvc);
556   else if (Format == "vi")
557     Opts.setFormat(DiagnosticOptions::Vi);
558   else {
559     Success = false;
560     if (Diags)
561       Diags->Report(diag::err_drv_invalid_value)
562       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
563       << Format;
564   }
565 
566   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
567   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
568   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
569   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
570   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
571   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
572   Opts.ErrorLimit = Args.getLastArgIntValue(OPT_ferror_limit, 0, Diags);
573   Opts.MacroBacktraceLimit
574     = Args.getLastArgIntValue(OPT_fmacro_backtrace_limit,
575                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
576   Opts.TemplateBacktraceLimit
577     = Args.getLastArgIntValue(OPT_ftemplate_backtrace_limit,
578                          DiagnosticOptions::DefaultTemplateBacktraceLimit,
579                          Diags);
580   Opts.ConstexprBacktraceLimit
581     = Args.getLastArgIntValue(OPT_fconstexpr_backtrace_limit,
582                          DiagnosticOptions::DefaultConstexprBacktraceLimit,
583                          Diags);
584   Opts.TabStop = Args.getLastArgIntValue(OPT_ftabstop,
585                                     DiagnosticOptions::DefaultTabStop, Diags);
586   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
587     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
588     if (Diags)
589       Diags->Report(diag::warn_ignoring_ftabstop_value)
590       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
591   }
592   Opts.MessageLength = Args.getLastArgIntValue(OPT_fmessage_length, 0, Diags);
593   addWarningArgs(Args, Opts.Warnings);
594 
595   return Success;
596 }
597 
598 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
599   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
600 }
601 
602 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
603                                    DiagnosticsEngine &Diags) {
604   using namespace options;
605   Opts.ProgramAction = frontend::ParseSyntaxOnly;
606   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
607     switch (A->getOption().getID()) {
608     default:
609       llvm_unreachable("Invalid option in group!");
610     case OPT_ast_list:
611       Opts.ProgramAction = frontend::ASTDeclList; break;
612     case OPT_ast_dump:
613       Opts.ProgramAction = frontend::ASTDump; break;
614     case OPT_ast_dump_xml:
615       Opts.ProgramAction = frontend::ASTDumpXML; break;
616     case OPT_ast_print:
617       Opts.ProgramAction = frontend::ASTPrint; break;
618     case OPT_ast_view:
619       Opts.ProgramAction = frontend::ASTView; break;
620     case OPT_dump_raw_tokens:
621       Opts.ProgramAction = frontend::DumpRawTokens; break;
622     case OPT_dump_tokens:
623       Opts.ProgramAction = frontend::DumpTokens; break;
624     case OPT_S:
625       Opts.ProgramAction = frontend::EmitAssembly; break;
626     case OPT_emit_llvm_bc:
627       Opts.ProgramAction = frontend::EmitBC; break;
628     case OPT_emit_html:
629       Opts.ProgramAction = frontend::EmitHTML; break;
630     case OPT_emit_llvm:
631       Opts.ProgramAction = frontend::EmitLLVM; break;
632     case OPT_emit_llvm_only:
633       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
634     case OPT_emit_codegen_only:
635       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
636     case OPT_emit_obj:
637       Opts.ProgramAction = frontend::EmitObj; break;
638     case OPT_fixit_EQ:
639       Opts.FixItSuffix = A->getValue();
640       // fall-through!
641     case OPT_fixit:
642       Opts.ProgramAction = frontend::FixIt; break;
643     case OPT_emit_module:
644       Opts.ProgramAction = frontend::GenerateModule; break;
645     case OPT_emit_pch:
646       Opts.ProgramAction = frontend::GeneratePCH; break;
647     case OPT_emit_pth:
648       Opts.ProgramAction = frontend::GeneratePTH; break;
649     case OPT_init_only:
650       Opts.ProgramAction = frontend::InitOnly; break;
651     case OPT_fsyntax_only:
652       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
653     case OPT_module_file_info:
654       Opts.ProgramAction = frontend::ModuleFileInfo; break;
655     case OPT_print_decl_contexts:
656       Opts.ProgramAction = frontend::PrintDeclContext; break;
657     case OPT_print_preamble:
658       Opts.ProgramAction = frontend::PrintPreamble; break;
659     case OPT_E:
660       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
661     case OPT_rewrite_macros:
662       Opts.ProgramAction = frontend::RewriteMacros; break;
663     case OPT_rewrite_objc:
664       Opts.ProgramAction = frontend::RewriteObjC; break;
665     case OPT_rewrite_test:
666       Opts.ProgramAction = frontend::RewriteTest; break;
667     case OPT_analyze:
668       Opts.ProgramAction = frontend::RunAnalysis; break;
669     case OPT_migrate:
670       Opts.ProgramAction = frontend::MigrateSource; break;
671     case OPT_Eonly:
672       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
673     }
674   }
675 
676   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
677     Opts.Plugins.push_back(A->getValue(0));
678     Opts.ProgramAction = frontend::PluginAction;
679     Opts.ActionName = A->getValue();
680 
681     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
682            end = Args.filtered_end(); it != end; ++it) {
683       if ((*it)->getValue(0) == Opts.ActionName)
684         Opts.PluginArgs.push_back((*it)->getValue(1));
685     }
686   }
687 
688   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
689   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
690   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
691     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
692            end = Args.filtered_end(); it != end; ++it) {
693       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
694         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
695     }
696   }
697 
698   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
699     Opts.CodeCompletionAt =
700       ParsedSourceLocation::FromString(A->getValue());
701     if (Opts.CodeCompletionAt.FileName.empty())
702       Diags.Report(diag::err_drv_invalid_value)
703         << A->getAsString(Args) << A->getValue();
704   }
705   Opts.DisableFree = Args.hasArg(OPT_disable_free);
706 
707   Opts.OutputFile = Args.getLastArgValue(OPT_o);
708   Opts.Plugins = Args.getAllArgValues(OPT_load);
709   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
710   Opts.ShowHelp = Args.hasArg(OPT_help);
711   Opts.ShowStats = Args.hasArg(OPT_print_stats);
712   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
713   Opts.ShowVersion = Args.hasArg(OPT_version);
714   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
715   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
716   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
717   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
718   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
719   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
720   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
721   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
722   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
723 
724   Opts.CodeCompleteOpts.IncludeMacros
725     = Args.hasArg(OPT_code_completion_macros);
726   Opts.CodeCompleteOpts.IncludeCodePatterns
727     = Args.hasArg(OPT_code_completion_patterns);
728   Opts.CodeCompleteOpts.IncludeGlobals
729     = !Args.hasArg(OPT_no_code_completion_globals);
730   Opts.CodeCompleteOpts.IncludeBriefComments
731     = Args.hasArg(OPT_code_completion_brief_comments);
732 
733   Opts.OverrideRecordLayoutsFile
734     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
735   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
736                                      OPT_arcmt_modify,
737                                      OPT_arcmt_migrate)) {
738     switch (A->getOption().getID()) {
739     default:
740       llvm_unreachable("missed a case");
741     case OPT_arcmt_check:
742       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
743       break;
744     case OPT_arcmt_modify:
745       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
746       break;
747     case OPT_arcmt_migrate:
748       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
749       break;
750     }
751   }
752   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
753   Opts.ARCMTMigrateReportOut
754     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
755   Opts.ARCMTMigrateEmitARCErrors
756     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
757 
758   if (Args.hasArg(OPT_objcmt_migrate_literals))
759     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
760   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
761     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
762 
763   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
764       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
765     Diags.Report(diag::err_drv_argument_not_allowed_with)
766       << "ARC migration" << "ObjC migration";
767   }
768 
769   InputKind DashX = IK_None;
770   if (const Arg *A = Args.getLastArg(OPT_x)) {
771     DashX = llvm::StringSwitch<InputKind>(A->getValue())
772       .Case("c", IK_C)
773       .Case("cl", IK_OpenCL)
774       .Case("cuda", IK_CUDA)
775       .Case("c++", IK_CXX)
776       .Case("objective-c", IK_ObjC)
777       .Case("objective-c++", IK_ObjCXX)
778       .Case("cpp-output", IK_PreprocessedC)
779       .Case("assembler-with-cpp", IK_Asm)
780       .Case("c++-cpp-output", IK_PreprocessedCXX)
781       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
782       .Case("objc-cpp-output", IK_PreprocessedObjC)
783       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
784       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
785       .Case("c-header", IK_C)
786       .Case("cl-header", IK_OpenCL)
787       .Case("objective-c-header", IK_ObjC)
788       .Case("c++-header", IK_CXX)
789       .Case("objective-c++-header", IK_ObjCXX)
790       .Cases("ast", "pcm", IK_AST)
791       .Case("ir", IK_LLVM_IR)
792       .Default(IK_None);
793     if (DashX == IK_None)
794       Diags.Report(diag::err_drv_invalid_value)
795         << A->getAsString(Args) << A->getValue();
796   }
797 
798   // '-' is the default input if none is given.
799   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
800   Opts.Inputs.clear();
801   if (Inputs.empty())
802     Inputs.push_back("-");
803   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
804     InputKind IK = DashX;
805     if (IK == IK_None) {
806       IK = FrontendOptions::getInputKindForExtension(
807         StringRef(Inputs[i]).rsplit('.').second);
808       // FIXME: Remove this hack.
809       if (i == 0)
810         DashX = IK;
811     }
812     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
813   }
814 
815   return DashX;
816 }
817 
818 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
819                                                  void *MainAddr) {
820   llvm::sys::Path P = llvm::sys::Path::GetMainExecutable(Argv0, MainAddr);
821 
822   if (!P.isEmpty()) {
823     P.eraseComponent();  // Remove /clang from foo/bin/clang
824     P.eraseComponent();  // Remove /bin   from foo/bin
825 
826     // Get foo/lib/clang/<version>/include
827     P.appendComponent("lib");
828     P.appendComponent("clang");
829     P.appendComponent(CLANG_VERSION_STRING);
830   }
831 
832   return P.str();
833 }
834 
835 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
836   using namespace options;
837   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
838   Opts.Verbose = Args.hasArg(OPT_v);
839   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
840   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
841   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
842   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
843     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
844   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
845   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
846   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
847   Opts.ModuleCachePruneInterval
848     = Args.getLastArgIntValue(OPT_fmodules_prune_interval, 7*24*60*60);
849   Opts.ModuleCachePruneAfter
850     = Args.getLastArgIntValue(OPT_fmodules_prune_after, 31*24*60*60);
851   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
852        ie = Args.filtered_end(); it != ie; ++it) {
853     StringRef MacroDef = (*it)->getValue();
854     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
855   }
856 
857   // Add -I..., -F..., and -index-header-map options in order.
858   bool IsIndexHeaderMap = false;
859   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
860                                              OPT_index_header_map),
861        ie = Args.filtered_end(); it != ie; ++it) {
862     if ((*it)->getOption().matches(OPT_index_header_map)) {
863       // -index-header-map applies to the next -I or -F.
864       IsIndexHeaderMap = true;
865       continue;
866     }
867 
868     frontend::IncludeDirGroup Group
869       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
870 
871     Opts.AddPath((*it)->getValue(), Group,
872                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
873     IsIndexHeaderMap = false;
874   }
875 
876   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
877   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
878   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
879                                              OPT_iwithprefixbefore),
880          ie = Args.filtered_end(); it != ie; ++it) {
881     const Arg *A = *it;
882     if (A->getOption().matches(OPT_iprefix))
883       Prefix = A->getValue();
884     else if (A->getOption().matches(OPT_iwithprefix))
885       Opts.AddPath(Prefix.str() + A->getValue(),
886                    frontend::After, false, true);
887     else
888       Opts.AddPath(Prefix.str() + A->getValue(),
889                    frontend::Angled, false, true);
890   }
891 
892   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
893          ie = Args.filtered_end(); it != ie; ++it)
894     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
895   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
896          ie = Args.filtered_end(); it != ie; ++it)
897     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
898   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
899          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
900     Opts.AddPath((*it)->getValue(), frontend::System, false,
901                  !(*it)->getOption().matches(OPT_iwithsysroot));
902   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
903          ie = Args.filtered_end(); it != ie; ++it)
904     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
905 
906   // Add the paths for the various language specific isystem flags.
907   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
908        ie = Args.filtered_end(); it != ie; ++it)
909     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
910   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
911        ie = Args.filtered_end(); it != ie; ++it)
912     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
913   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
914        ie = Args.filtered_end(); it != ie; ++it)
915     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
916   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
917        ie = Args.filtered_end(); it != ie; ++it)
918     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
919 
920   // Add the internal paths from a driver that detects standard include paths.
921   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
922                                             OPT_internal_externc_isystem),
923                     E = Args.filtered_end();
924        I != E; ++I) {
925     frontend::IncludeDirGroup Group = frontend::System;
926     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
927       Group = frontend::ExternCSystem;
928     Opts.AddPath((*I)->getValue(), Group, false, true);
929   }
930 
931   // Add the path prefixes which are implicitly treated as being system headers.
932   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
933                                             OPT_ino_system_prefix),
934                     E = Args.filtered_end();
935        I != E; ++I)
936     Opts.AddSystemHeaderPrefix((*I)->getValue(),
937                                (*I)->getOption().matches(OPT_isystem_prefix));
938 }
939 
940 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
941                                          LangStandard::Kind LangStd) {
942   // Set some properties which depend solely on the input kind; it would be nice
943   // to move these to the language standard, and have the driver resolve the
944   // input kind + language standard.
945   if (IK == IK_Asm) {
946     Opts.AsmPreprocessor = 1;
947   } else if (IK == IK_ObjC ||
948              IK == IK_ObjCXX ||
949              IK == IK_PreprocessedObjC ||
950              IK == IK_PreprocessedObjCXX) {
951     Opts.ObjC1 = Opts.ObjC2 = 1;
952   }
953 
954   if (LangStd == LangStandard::lang_unspecified) {
955     // Based on the base language, pick one.
956     switch (IK) {
957     case IK_None:
958     case IK_AST:
959     case IK_LLVM_IR:
960       llvm_unreachable("Invalid input kind!");
961     case IK_OpenCL:
962       LangStd = LangStandard::lang_opencl;
963       break;
964     case IK_CUDA:
965       LangStd = LangStandard::lang_cuda;
966       break;
967     case IK_Asm:
968     case IK_C:
969     case IK_PreprocessedC:
970     case IK_ObjC:
971     case IK_PreprocessedObjC:
972       LangStd = LangStandard::lang_gnu99;
973       break;
974     case IK_CXX:
975     case IK_PreprocessedCXX:
976     case IK_ObjCXX:
977     case IK_PreprocessedObjCXX:
978       LangStd = LangStandard::lang_gnucxx98;
979       break;
980     }
981   }
982 
983   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
984   Opts.LineComment = Std.hasLineComments();
985   Opts.C99 = Std.isC99();
986   Opts.C11 = Std.isC11();
987   Opts.CPlusPlus = Std.isCPlusPlus();
988   Opts.CPlusPlus11 = Std.isCPlusPlus11();
989   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
990   Opts.Digraphs = Std.hasDigraphs();
991   Opts.GNUMode = Std.isGNUMode();
992   Opts.GNUInline = !Std.isC99();
993   Opts.HexFloats = Std.hasHexFloats();
994   Opts.ImplicitInt = Std.hasImplicitInt();
995 
996   // Set OpenCL Version.
997   if (LangStd == LangStandard::lang_opencl) {
998     Opts.OpenCL = 1;
999     Opts.OpenCLVersion = 100;
1000   }
1001   else if (LangStd == LangStandard::lang_opencl11) {
1002       Opts.OpenCL = 1;
1003       Opts.OpenCLVersion = 110;
1004   }
1005   else if (LangStd == LangStandard::lang_opencl12) {
1006     Opts.OpenCL = 1;
1007     Opts.OpenCLVersion = 120;
1008   }
1009 
1010   // OpenCL has some additional defaults.
1011   if (Opts.OpenCL) {
1012     Opts.AltiVec = 0;
1013     Opts.CXXOperatorNames = 1;
1014     Opts.LaxVectorConversions = 0;
1015     Opts.DefaultFPContract = 1;
1016     Opts.NativeHalfType = 1;
1017   }
1018 
1019   if (LangStd == LangStandard::lang_cuda)
1020     Opts.CUDA = 1;
1021 
1022   // OpenCL and C++ both have bool, true, false keywords.
1023   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1024 
1025   // C++ has wchar_t keyword.
1026   Opts.WChar = Opts.CPlusPlus;
1027 
1028   Opts.GNUKeywords = Opts.GNUMode;
1029   Opts.CXXOperatorNames = Opts.CPlusPlus;
1030 
1031   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1032   // is specified, or -std is set to a conforming mode.
1033   Opts.Trigraphs = !Opts.GNUMode;
1034 
1035   Opts.DollarIdents = !Opts.AsmPreprocessor;
1036 }
1037 
1038 /// Attempt to parse a visibility value out of the given argument.
1039 static Visibility parseVisibility(Arg *arg, ArgList &args,
1040                                   DiagnosticsEngine &diags) {
1041   StringRef value = arg->getValue();
1042   if (value == "default") {
1043     return DefaultVisibility;
1044   } else if (value == "hidden") {
1045     return HiddenVisibility;
1046   } else if (value == "protected") {
1047     // FIXME: diagnose if target does not support protected visibility
1048     return ProtectedVisibility;
1049   }
1050 
1051   diags.Report(diag::err_drv_invalid_value)
1052     << arg->getAsString(args) << value;
1053   return DefaultVisibility;
1054 }
1055 
1056 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1057                           DiagnosticsEngine &Diags) {
1058   // FIXME: Cleanup per-file based stuff.
1059   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1060   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1061     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1062 #define LANGSTANDARD(id, name, desc, features) \
1063       .Case(name, LangStandard::lang_##id)
1064 #include "clang/Frontend/LangStandards.def"
1065       .Default(LangStandard::lang_unspecified);
1066     if (LangStd == LangStandard::lang_unspecified)
1067       Diags.Report(diag::err_drv_invalid_value)
1068         << A->getAsString(Args) << A->getValue();
1069     else {
1070       // Valid standard, check to make sure language and standard are compatable.
1071       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1072       switch (IK) {
1073       case IK_C:
1074       case IK_ObjC:
1075       case IK_PreprocessedC:
1076       case IK_PreprocessedObjC:
1077         if (!(Std.isC89() || Std.isC99()))
1078           Diags.Report(diag::err_drv_argument_not_allowed_with)
1079             << A->getAsString(Args) << "C/ObjC";
1080         break;
1081       case IK_CXX:
1082       case IK_ObjCXX:
1083       case IK_PreprocessedCXX:
1084       case IK_PreprocessedObjCXX:
1085         if (!Std.isCPlusPlus())
1086           Diags.Report(diag::err_drv_argument_not_allowed_with)
1087             << A->getAsString(Args) << "C++/ObjC++";
1088         break;
1089       case IK_OpenCL:
1090         if (!Std.isC99())
1091           Diags.Report(diag::err_drv_argument_not_allowed_with)
1092             << A->getAsString(Args) << "OpenCL";
1093         break;
1094       case IK_CUDA:
1095         if (!Std.isCPlusPlus())
1096           Diags.Report(diag::err_drv_argument_not_allowed_with)
1097             << A->getAsString(Args) << "CUDA";
1098         break;
1099       default:
1100         break;
1101       }
1102     }
1103   }
1104 
1105   // -cl-std only applies for OpenCL language standards.
1106   // Override the -std option in this case.
1107   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1108     LangStandard::Kind OpenCLLangStd
1109     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1110     .Case("CL", LangStandard::lang_opencl)
1111     .Case("CL1.1", LangStandard::lang_opencl11)
1112     .Case("CL1.2", LangStandard::lang_opencl12)
1113     .Default(LangStandard::lang_unspecified);
1114 
1115     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1116       Diags.Report(diag::err_drv_invalid_value)
1117       << A->getAsString(Args) << A->getValue();
1118     }
1119     else
1120       LangStd = OpenCLLangStd;
1121   }
1122 
1123   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1124 
1125   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1126   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1127   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1128   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1129   // name, as it doesn't seem a useful distinction.
1130   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1131                                   Opts.GNUKeywords);
1132 
1133   if (Args.hasArg(OPT_fno_operator_names))
1134     Opts.CXXOperatorNames = 0;
1135 
1136   if (Opts.ObjC1) {
1137     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1138       StringRef value = arg->getValue();
1139       if (Opts.ObjCRuntime.tryParse(value))
1140         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1141     }
1142 
1143     if (Args.hasArg(OPT_fobjc_gc_only))
1144       Opts.setGC(LangOptions::GCOnly);
1145     else if (Args.hasArg(OPT_fobjc_gc))
1146       Opts.setGC(LangOptions::HybridGC);
1147     else if (Args.hasArg(OPT_fobjc_arc)) {
1148       Opts.ObjCAutoRefCount = 1;
1149       if (!Opts.ObjCRuntime.allowsARC())
1150         Diags.Report(diag::err_arc_unsupported_on_runtime);
1151 
1152       // Only set ObjCARCWeak if ARC is enabled.
1153       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1154         Opts.ObjCARCWeak = 1;
1155       else
1156         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1157     }
1158 
1159     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1160       Opts.ObjCInferRelatedResultType = 0;
1161   }
1162 
1163   if (Args.hasArg(OPT_fgnu89_inline))
1164     Opts.GNUInline = 1;
1165 
1166   if (Args.hasArg(OPT_fapple_kext)) {
1167     if (!Opts.CPlusPlus)
1168       Diags.Report(diag::warn_c_kext);
1169     else
1170       Opts.AppleKext = 1;
1171   }
1172 
1173   if (Args.hasArg(OPT_print_ivar_layout))
1174     Opts.ObjCGCBitmapPrint = 1;
1175   if (Args.hasArg(OPT_fno_constant_cfstrings))
1176     Opts.NoConstantCFStrings = 1;
1177 
1178   if (Args.hasArg(OPT_faltivec))
1179     Opts.AltiVec = 1;
1180 
1181   if (Args.hasArg(OPT_pthread))
1182     Opts.POSIXThreads = 1;
1183 
1184   // The value-visibility mode defaults to "default".
1185   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1186     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1187   } else {
1188     Opts.setValueVisibilityMode(DefaultVisibility);
1189   }
1190 
1191   // The type-visibility mode defaults to the value-visibility mode.
1192   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1193     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1194   } else {
1195     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1196   }
1197 
1198   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1199     Opts.InlineVisibilityHidden = 1;
1200 
1201   if (Args.hasArg(OPT_ftrapv)) {
1202     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1203     // Set the handler, if one is specified.
1204     Opts.OverflowHandler =
1205         Args.getLastArgValue(OPT_ftrapv_handler);
1206   }
1207   else if (Args.hasArg(OPT_fwrapv))
1208     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1209 
1210   if (Args.hasArg(OPT_trigraphs))
1211     Opts.Trigraphs = 1;
1212 
1213   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1214                                    OPT_fno_dollars_in_identifiers,
1215                                    Opts.DollarIdents);
1216   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1217   Opts.MicrosoftExt
1218     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1219   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1220   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1221   Opts.MSCVersion = Args.getLastArgIntValue(OPT_fmsc_version, 0, Diags);
1222   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1223   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1224   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1225                                    Opts.ConstStrings);
1226   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1227     Opts.LaxVectorConversions = 0;
1228   if (Args.hasArg(OPT_fno_threadsafe_statics))
1229     Opts.ThreadsafeStatics = 0;
1230   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1231   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1232   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1233   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1234   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1235 
1236   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1237   Opts.Blocks = Args.hasArg(OPT_fblocks);
1238   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1239   Opts.Modules = Args.hasArg(OPT_fmodules);
1240   Opts.CharIsSigned = !Args.hasArg(OPT_fno_signed_char);
1241   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1242   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1243   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1244   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1245   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1246   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1247   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1248   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1249   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1250   Opts.MathErrno = Args.hasArg(OPT_fmath_errno);
1251   Opts.InstantiationDepth = Args.getLastArgIntValue(OPT_ftemplate_depth, 256,
1252                                                     Diags);
1253   Opts.ConstexprCallDepth = Args.getLastArgIntValue(OPT_fconstexpr_depth, 512,
1254                                                     Diags);
1255   Opts.ConstexprStepLimit = Args.getLastArgIntValue(OPT_fconstexpr_steps,
1256                                                     1048576, Diags);
1257   Opts.BracketDepth = Args.getLastArgIntValue(OPT_fbracket_depth, 256, Diags);
1258   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1259   Opts.NumLargeByValueCopy = Args.getLastArgIntValue(OPT_Wlarge_by_value_copy_EQ,
1260                                                     0, Diags);
1261   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1262   Opts.ObjCConstantStringClass =
1263     Args.getLastArgValue(OPT_fconstant_string_class);
1264   Opts.ObjCDefaultSynthProperties =
1265     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1266   Opts.EncodeExtendedBlockSig =
1267     Args.hasArg(OPT_fencode_extended_block_signature);
1268   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1269   Opts.PackStruct = Args.getLastArgIntValue(OPT_fpack_struct_EQ, 0, Diags);
1270   Opts.PICLevel = Args.getLastArgIntValue(OPT_pic_level, 0, Diags);
1271   Opts.PIELevel = Args.getLastArgIntValue(OPT_pie_level, 0, Diags);
1272   Opts.Static = Args.hasArg(OPT_static_define);
1273   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1274   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1275                         || Args.hasArg(OPT_fdump_record_layouts);
1276   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1277   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1278   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1279   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1280   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1281   Opts.MRTD = Args.hasArg(OPT_mrtd);
1282   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1283   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1284   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1285   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1286   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1287   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1288   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1289   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1290 
1291   // Check if -fopenmp is specified.
1292   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1293 
1294   // Record whether the __DEPRECATED define was requested.
1295   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1296                                  OPT_fno_deprecated_macro,
1297                                  Opts.Deprecated);
1298 
1299   // FIXME: Eliminate this dependency.
1300   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1301        OptSize = getOptimizationLevelSize(Args);
1302   Opts.Optimize = Opt != 0;
1303   Opts.OptimizeSize = OptSize != 0;
1304 
1305   // This is the __NO_INLINE__ define, which just depends on things like the
1306   // optimization level and -fno-inline, not actually whether the backend has
1307   // inlining enabled.
1308   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1309 
1310   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1311   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1312 
1313   Opts.RetainCommentsFromSystemHeaders =
1314       Args.hasArg(OPT_fretain_comments_from_system_headers);
1315 
1316   unsigned SSP = Args.getLastArgIntValue(OPT_stack_protector, 0, Diags);
1317   switch (SSP) {
1318   default:
1319     Diags.Report(diag::err_drv_invalid_value)
1320       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1321     break;
1322   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1323   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1324   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1325   }
1326 
1327   // Parse -fsanitize= arguments.
1328   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1329   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1330     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1331     // efficiently map string values to them. Perform the mapping indirectly:
1332     // convert strings to enumerated values, then switch over the enum to set
1333     // the right bitfield value.
1334     enum Sanitizer {
1335 #define SANITIZER(NAME, ID) \
1336       ID,
1337 #include "clang/Basic/Sanitizers.def"
1338       Unknown
1339     };
1340     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1341 #define SANITIZER(NAME, ID) \
1342               .Case(NAME, ID)
1343 #include "clang/Basic/Sanitizers.def"
1344               .Default(Unknown)) {
1345 #define SANITIZER(NAME, ID) \
1346     case ID: \
1347       Opts.Sanitize.ID = true; \
1348       break;
1349 #include "clang/Basic/Sanitizers.def"
1350 
1351     case Unknown:
1352       Diags.Report(diag::err_drv_invalid_value)
1353         << "-fsanitize=" << Sanitizers[I];
1354       break;
1355     }
1356   }
1357 }
1358 
1359 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1360                                   FileManager &FileMgr,
1361                                   DiagnosticsEngine &Diags) {
1362   using namespace options;
1363   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1364   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1365   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1366       Opts.TokenCache = A->getValue();
1367   else
1368     Opts.TokenCache = Opts.ImplicitPTHInclude;
1369   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1370   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1371   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1372 
1373   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1374   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1375          ie = Args.filtered_end(); it != ie; ++it) {
1376     const Arg *A = *it;
1377     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1378   }
1379 
1380   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1381     StringRef Value(A->getValue());
1382     size_t Comma = Value.find(',');
1383     unsigned Bytes = 0;
1384     unsigned EndOfLine = 0;
1385 
1386     if (Comma == StringRef::npos ||
1387         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1388         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1389       Diags.Report(diag::err_drv_preamble_format);
1390     else {
1391       Opts.PrecompiledPreambleBytes.first = Bytes;
1392       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1393     }
1394   }
1395 
1396   // Add macros from the command line.
1397   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1398          ie = Args.filtered_end(); it != ie; ++it) {
1399     if ((*it)->getOption().matches(OPT_D))
1400       Opts.addMacroDef((*it)->getValue());
1401     else
1402       Opts.addMacroUndef((*it)->getValue());
1403   }
1404 
1405   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1406 
1407   // Add the ordered list of -includes.
1408   for (arg_iterator it = Args.filtered_begin(OPT_include),
1409          ie = Args.filtered_end(); it != ie; ++it) {
1410     const Arg *A = *it;
1411     Opts.Includes.push_back(A->getValue());
1412   }
1413 
1414   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1415          ie = Args.filtered_end(); it != ie; ++it) {
1416     const Arg *A = *it;
1417     Opts.ChainedIncludes.push_back(A->getValue());
1418   }
1419 
1420   // Include 'altivec.h' if -faltivec option present
1421   if (Args.hasArg(OPT_faltivec))
1422     Opts.Includes.push_back("altivec.h");
1423 
1424   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1425          ie = Args.filtered_end(); it != ie; ++it) {
1426     const Arg *A = *it;
1427     std::pair<StringRef,StringRef> Split =
1428       StringRef(A->getValue()).split(';');
1429 
1430     if (Split.second.empty()) {
1431       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1432       continue;
1433     }
1434 
1435     Opts.addRemappedFile(Split.first, Split.second);
1436   }
1437 
1438   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1439     StringRef Name = A->getValue();
1440     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1441       .Case("libc++", ARCXX_libcxx)
1442       .Case("libstdc++", ARCXX_libstdcxx)
1443       .Case("none", ARCXX_nolib)
1444       .Default(~0U);
1445     if (Library == ~0U)
1446       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1447     else
1448       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1449   }
1450 }
1451 
1452 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1453                                         ArgList &Args,
1454                                         frontend::ActionKind Action) {
1455   using namespace options;
1456 
1457   switch (Action) {
1458   case frontend::ASTDeclList:
1459   case frontend::ASTDump:
1460   case frontend::ASTDumpXML:
1461   case frontend::ASTPrint:
1462   case frontend::ASTView:
1463   case frontend::EmitAssembly:
1464   case frontend::EmitBC:
1465   case frontend::EmitHTML:
1466   case frontend::EmitLLVM:
1467   case frontend::EmitLLVMOnly:
1468   case frontend::EmitCodeGenOnly:
1469   case frontend::EmitObj:
1470   case frontend::FixIt:
1471   case frontend::GenerateModule:
1472   case frontend::GeneratePCH:
1473   case frontend::GeneratePTH:
1474   case frontend::ParseSyntaxOnly:
1475   case frontend::ModuleFileInfo:
1476   case frontend::PluginAction:
1477   case frontend::PrintDeclContext:
1478   case frontend::RewriteObjC:
1479   case frontend::RewriteTest:
1480   case frontend::RunAnalysis:
1481   case frontend::MigrateSource:
1482     Opts.ShowCPP = 0;
1483     break;
1484 
1485   case frontend::DumpRawTokens:
1486   case frontend::DumpTokens:
1487   case frontend::InitOnly:
1488   case frontend::PrintPreamble:
1489   case frontend::PrintPreprocessedInput:
1490   case frontend::RewriteMacros:
1491   case frontend::RunPreprocessorOnly:
1492     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1493     break;
1494   }
1495 
1496   Opts.ShowComments = Args.hasArg(OPT_C);
1497   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1498   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1499   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1500   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1501 }
1502 
1503 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1504   using namespace options;
1505   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1506   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1507   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1508   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1509   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1510   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1511 
1512   // Use the default target triple if unspecified.
1513   if (Opts.Triple.empty())
1514     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1515 }
1516 
1517 //
1518 
1519 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1520                                         const char *const *ArgBegin,
1521                                         const char *const *ArgEnd,
1522                                         DiagnosticsEngine &Diags) {
1523   bool Success = true;
1524 
1525   // Parse the arguments.
1526   OwningPtr<OptTable> Opts(createDriverOptTable());
1527   unsigned MissingArgIndex, MissingArgCount;
1528   OwningPtr<InputArgList> Args(
1529     Opts->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
1530 
1531   // Check for missing argument error.
1532   if (MissingArgCount) {
1533     Diags.Report(diag::err_drv_missing_argument)
1534       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1535     Success = false;
1536   }
1537 
1538   // Issue errors on unknown arguments.
1539   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1540          ie = Args->filtered_end(); it != ie; ++it) {
1541     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1542     Success = false;
1543   }
1544 
1545   // Issue errors on arguments that are not valid for CC1.
1546   for (ArgList::iterator I = Args->begin(), E = Args->end();
1547        I != E; ++I) {
1548     if (!(*I)->getOption().hasFlag(options::CC1Option)) {
1549       Diags.Report(diag::err_drv_unknown_argument) << (*I)->getAsString(*Args);
1550       Success = false;
1551     }
1552   }
1553 
1554   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1555   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1556   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1557   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1558             && Success;
1559   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1560   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1561   // FIXME: We shouldn't have to pass the DashX option around here
1562   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1563   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1564             && Success;
1565   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1566   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1567     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1568     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1569       Res.getLangOpts()->ObjCExceptions = 1;
1570   }
1571   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1572   // PCH file and find the original header name. Remove the need to do that in
1573   // ParsePreprocessorArgs and remove the FileManager
1574   // parameters from the function and the "FileManager.h" #include.
1575   FileManager FileMgr(Res.getFileSystemOpts());
1576   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1577   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1578                               Res.getFrontendOpts().ProgramAction);
1579   ParseTargetArgs(Res.getTargetOpts(), *Args);
1580 
1581   return Success;
1582 }
1583 
1584 namespace {
1585 
1586   class ModuleSignature {
1587     SmallVector<uint64_t, 16> Data;
1588     unsigned CurBit;
1589     uint64_t CurValue;
1590 
1591   public:
1592     ModuleSignature() : CurBit(0), CurValue(0) { }
1593 
1594     void add(uint64_t Value, unsigned Bits);
1595     void add(StringRef Value);
1596     void flush();
1597 
1598     llvm::APInt getAsInteger() const;
1599   };
1600 }
1601 
1602 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1603   CurValue |= Value << CurBit;
1604   if (CurBit + NumBits < 64) {
1605     CurBit += NumBits;
1606     return;
1607   }
1608 
1609   // Add the current word.
1610   Data.push_back(CurValue);
1611 
1612   if (CurBit)
1613     CurValue = Value >> (64-CurBit);
1614   else
1615     CurValue = 0;
1616   CurBit = (CurBit+NumBits) & 63;
1617 }
1618 
1619 void ModuleSignature::flush() {
1620   if (CurBit == 0)
1621     return;
1622 
1623   Data.push_back(CurValue);
1624   CurBit = 0;
1625   CurValue = 0;
1626 }
1627 
1628 void ModuleSignature::add(StringRef Value) {
1629   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1630     add(*I, 8);
1631 }
1632 
1633 llvm::APInt ModuleSignature::getAsInteger() const {
1634   return llvm::APInt(Data.size() * 64, Data);
1635 }
1636 
1637 std::string CompilerInvocation::getModuleHash() const {
1638   // Note: For QoI reasons, the things we use as a hash here should all be
1639   // dumped via the -module-info flag.
1640   using llvm::hash_code;
1641   using llvm::hash_value;
1642   using llvm::hash_combine;
1643 
1644   // Start the signature with the compiler version.
1645   // FIXME: We'd rather use something more cryptographically sound than
1646   // CityHash, but this will do for now.
1647   hash_code code = hash_value(getClangFullRepositoryVersion());
1648 
1649   // Extend the signature with the language options
1650 #define LANGOPT(Name, Bits, Default, Description) \
1651    code = hash_combine(code, LangOpts->Name);
1652 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1653   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1654 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1655 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1656 #include "clang/Basic/LangOptions.def"
1657 
1658   // Extend the signature with the target options.
1659   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1660                       TargetOpts->ABI, TargetOpts->CXXABI,
1661                       TargetOpts->LinkerVersion);
1662   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1663     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1664 
1665   // Extend the signature with preprocessor options.
1666   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1667   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1668   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1669 
1670   std::vector<StringRef> MacroDefs;
1671   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1672             I = getPreprocessorOpts().Macros.begin(),
1673          IEnd = getPreprocessorOpts().Macros.end();
1674        I != IEnd; ++I) {
1675     // If we're supposed to ignore this macro for the purposes of modules,
1676     // don't put it into the hash.
1677     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1678       // Check whether we're ignoring this macro.
1679       StringRef MacroDef = I->first;
1680       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1681         continue;
1682     }
1683 
1684     code = hash_combine(code, I->first, I->second);
1685   }
1686 
1687   // Extend the signature with the sysroot.
1688   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1689                       hsOpts.UseStandardSystemIncludes,
1690                       hsOpts.UseStandardCXXIncludes,
1691                       hsOpts.UseLibcxx);
1692 
1693   // Darwin-specific hack: if we have a sysroot, use the contents and
1694   // modification time of
1695   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1696   // as part of the module hash.
1697   if (!hsOpts.Sysroot.empty()) {
1698     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1699     SmallString<128> systemVersionFile;
1700     systemVersionFile += hsOpts.Sysroot;
1701     llvm::sys::path::append(systemVersionFile, "System");
1702     llvm::sys::path::append(systemVersionFile, "Library");
1703     llvm::sys::path::append(systemVersionFile, "CoreServices");
1704     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1705     if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
1706       code = hash_combine(code, buffer.get()->getBuffer());
1707 
1708       struct stat statBuf;
1709       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1710         code = hash_combine(code, statBuf.st_mtime);
1711     }
1712   }
1713 
1714   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1715 }
1716