xref: /llvm-project/clang/lib/Frontend/CompilerInvocation.cpp (revision be5138885d99d35b56c87590a89637a8a303f58d)
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/PathV1.h"
33 #include "llvm/Support/system_error.h"
34 #include <sys/stat.h>
35 using namespace clang;
36 
37 //===----------------------------------------------------------------------===//
38 // Initialization.
39 //===----------------------------------------------------------------------===//
40 
41 CompilerInvocationBase::CompilerInvocationBase()
42   : LangOpts(new LangOptions()), TargetOpts(new TargetOptions()),
43     DiagnosticOpts(new DiagnosticOptions()),
44     HeaderSearchOpts(new HeaderSearchOptions()),
45     PreprocessorOpts(new PreprocessorOptions()) {}
46 
47 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &X)
48   : RefCountedBase<CompilerInvocation>(),
49     LangOpts(new LangOptions(*X.getLangOpts())),
50     TargetOpts(new TargetOptions(X.getTargetOpts())),
51     DiagnosticOpts(new DiagnosticOptions(X.getDiagnosticOpts())),
52     HeaderSearchOpts(new HeaderSearchOptions(X.getHeaderSearchOpts())),
53     PreprocessorOpts(new PreprocessorOptions(X.getPreprocessorOpts())) {}
54 
55 //===----------------------------------------------------------------------===//
56 // Deserialization (from args)
57 //===----------------------------------------------------------------------===//
58 
59 using namespace clang::driver;
60 using namespace clang::driver::options;
61 
62 //
63 
64 static unsigned getOptimizationLevel(ArgList &Args, InputKind IK,
65                                      DiagnosticsEngine &Diags) {
66   unsigned DefaultOpt = 0;
67   if (IK == IK_OpenCL && !Args.hasArg(OPT_cl_opt_disable))
68     DefaultOpt = 2;
69 
70   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
71     if (A->getOption().matches(options::OPT_O0))
72       return 0;
73 
74     if (A->getOption().matches(options::OPT_Ofast))
75       return 3;
76 
77     assert (A->getOption().matches(options::OPT_O));
78 
79     StringRef S(A->getValue());
80     if (S == "s" || S == "z" || S.empty())
81       return 2;
82 
83     return Args.getLastArgIntValue(OPT_O, DefaultOpt, Diags);
84   }
85 
86   return DefaultOpt;
87 }
88 
89 static unsigned getOptimizationLevelSize(ArgList &Args) {
90   if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
91     if (A->getOption().matches(options::OPT_O)) {
92       switch (A->getValue()[0]) {
93       default:
94         return 0;
95       case 's':
96         return 1;
97       case 'z':
98         return 2;
99       }
100     }
101   }
102   return 0;
103 }
104 
105 static void addWarningArgs(ArgList &Args, std::vector<std::string> &Warnings) {
106   for (arg_iterator I = Args.filtered_begin(OPT_W_Group),
107          E = Args.filtered_end(); I != E; ++I) {
108     Arg *A = *I;
109     // If the argument is a pure flag, add its name (minus the "W" at the beginning)
110     // to the warning list. Else, add its value (for the OPT_W case).
111     if (A->getOption().getKind() == Option::FlagClass) {
112       Warnings.push_back(A->getOption().getName().substr(1));
113     } else {
114       for (unsigned Idx = 0, End = A->getNumValues();
115            Idx < End; ++Idx) {
116         StringRef V = A->getValue(Idx);
117         // "-Wl," and such are not warning options.
118         // FIXME: Should be handled by putting these in separate flags.
119         if (V.startswith("l,") || V.startswith("a,") || V.startswith("p,"))
120           continue;
121 
122         Warnings.push_back(V);
123       }
124     }
125   }
126 }
127 
128 static bool ParseAnalyzerArgs(AnalyzerOptions &Opts, ArgList &Args,
129                               DiagnosticsEngine &Diags) {
130   using namespace options;
131   bool Success = true;
132   if (Arg *A = Args.getLastArg(OPT_analyzer_store)) {
133     StringRef Name = A->getValue();
134     AnalysisStores Value = llvm::StringSwitch<AnalysisStores>(Name)
135 #define ANALYSIS_STORE(NAME, CMDFLAG, DESC, CREATFN) \
136       .Case(CMDFLAG, NAME##Model)
137 #include "clang/StaticAnalyzer/Core/Analyses.def"
138       .Default(NumStores);
139     if (Value == NumStores) {
140       Diags.Report(diag::err_drv_invalid_value)
141         << A->getAsString(Args) << Name;
142       Success = false;
143     } else {
144       Opts.AnalysisStoreOpt = Value;
145     }
146   }
147 
148   if (Arg *A = Args.getLastArg(OPT_analyzer_constraints)) {
149     StringRef Name = A->getValue();
150     AnalysisConstraints Value = llvm::StringSwitch<AnalysisConstraints>(Name)
151 #define ANALYSIS_CONSTRAINTS(NAME, CMDFLAG, DESC, CREATFN) \
152       .Case(CMDFLAG, NAME##Model)
153 #include "clang/StaticAnalyzer/Core/Analyses.def"
154       .Default(NumConstraints);
155     if (Value == NumConstraints) {
156       Diags.Report(diag::err_drv_invalid_value)
157         << A->getAsString(Args) << Name;
158       Success = false;
159     } else {
160       Opts.AnalysisConstraintsOpt = Value;
161     }
162   }
163 
164   if (Arg *A = Args.getLastArg(OPT_analyzer_output)) {
165     StringRef Name = A->getValue();
166     AnalysisDiagClients Value = llvm::StringSwitch<AnalysisDiagClients>(Name)
167 #define ANALYSIS_DIAGNOSTICS(NAME, CMDFLAG, DESC, CREATFN, AUTOCREAT) \
168       .Case(CMDFLAG, PD_##NAME)
169 #include "clang/StaticAnalyzer/Core/Analyses.def"
170       .Default(NUM_ANALYSIS_DIAG_CLIENTS);
171     if (Value == NUM_ANALYSIS_DIAG_CLIENTS) {
172       Diags.Report(diag::err_drv_invalid_value)
173         << A->getAsString(Args) << Name;
174       Success = false;
175     } else {
176       Opts.AnalysisDiagOpt = Value;
177     }
178   }
179 
180   if (Arg *A = Args.getLastArg(OPT_analyzer_purge)) {
181     StringRef Name = A->getValue();
182     AnalysisPurgeMode Value = llvm::StringSwitch<AnalysisPurgeMode>(Name)
183 #define ANALYSIS_PURGE(NAME, CMDFLAG, DESC) \
184       .Case(CMDFLAG, NAME)
185 #include "clang/StaticAnalyzer/Core/Analyses.def"
186       .Default(NumPurgeModes);
187     if (Value == NumPurgeModes) {
188       Diags.Report(diag::err_drv_invalid_value)
189         << A->getAsString(Args) << Name;
190       Success = false;
191     } else {
192       Opts.AnalysisPurgeOpt = Value;
193     }
194   }
195 
196   if (Arg *A = Args.getLastArg(OPT_analyzer_inlining_mode)) {
197     StringRef Name = A->getValue();
198     AnalysisInliningMode Value = llvm::StringSwitch<AnalysisInliningMode>(Name)
199 #define ANALYSIS_INLINING_MODE(NAME, CMDFLAG, DESC) \
200       .Case(CMDFLAG, NAME)
201 #include "clang/StaticAnalyzer/Core/Analyses.def"
202       .Default(NumInliningModes);
203     if (Value == NumInliningModes) {
204       Diags.Report(diag::err_drv_invalid_value)
205         << A->getAsString(Args) << Name;
206       Success = false;
207     } else {
208       Opts.InliningMode = Value;
209     }
210   }
211 
212   Opts.ShowCheckerHelp = Args.hasArg(OPT_analyzer_checker_help);
213   Opts.visualizeExplodedGraphWithGraphViz =
214     Args.hasArg(OPT_analyzer_viz_egraph_graphviz);
215   Opts.visualizeExplodedGraphWithUbiGraph =
216     Args.hasArg(OPT_analyzer_viz_egraph_ubigraph);
217   Opts.NoRetryExhausted = Args.hasArg(OPT_analyzer_disable_retry_exhausted);
218   Opts.AnalyzeAll = Args.hasArg(OPT_analyzer_opt_analyze_headers);
219   Opts.AnalyzerDisplayProgress = Args.hasArg(OPT_analyzer_display_progress);
220   Opts.AnalyzeNestedBlocks =
221     Args.hasArg(OPT_analyzer_opt_analyze_nested_blocks);
222   Opts.eagerlyAssumeBinOpBifurcation = Args.hasArg(OPT_analyzer_eagerly_assume);
223   Opts.AnalyzeSpecificFunction = Args.getLastArgValue(OPT_analyze_function);
224   Opts.UnoptimizedCFG = Args.hasArg(OPT_analysis_UnoptimizedCFG);
225   Opts.TrimGraph = Args.hasArg(OPT_trim_egraph);
226   Opts.maxBlockVisitOnPath = Args.getLastArgIntValue(OPT_analyzer_max_loop, 4, Diags);
227   Opts.PrintStats = Args.hasArg(OPT_analyzer_stats);
228   Opts.InlineMaxStackDepth =
229     Args.getLastArgIntValue(OPT_analyzer_inline_max_stack_depth,
230                             Opts.InlineMaxStackDepth, Diags);
231 
232   Opts.CheckersControlList.clear();
233   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_checker,
234                                              OPT_analyzer_disable_checker),
235          ie = Args.filtered_end(); it != ie; ++it) {
236     const Arg *A = *it;
237     A->claim();
238     bool enable = (A->getOption().getID() == OPT_analyzer_checker);
239     // We can have a list of comma separated checker names, e.g:
240     // '-analyzer-checker=cocoa,unix'
241     StringRef checkerList = A->getValue();
242     SmallVector<StringRef, 4> checkers;
243     checkerList.split(checkers, ",");
244     for (unsigned i = 0, e = checkers.size(); i != e; ++i)
245       Opts.CheckersControlList.push_back(std::make_pair(checkers[i], enable));
246   }
247 
248   // Go through the analyzer configuration options.
249   for (arg_iterator it = Args.filtered_begin(OPT_analyzer_config),
250        ie = Args.filtered_end(); it != ie; ++it) {
251     const Arg *A = *it;
252     A->claim();
253     // We can have a list of comma separated config names, e.g:
254     // '-analyzer-config key1=val1,key2=val2'
255     StringRef configList = A->getValue();
256     SmallVector<StringRef, 4> configVals;
257     configList.split(configVals, ",");
258     for (unsigned i = 0, e = configVals.size(); i != e; ++i) {
259       StringRef key, val;
260       llvm::tie(key, val) = configVals[i].split("=");
261       if (val.empty()) {
262         Diags.Report(SourceLocation(),
263                      diag::err_analyzer_config_no_value) << configVals[i];
264         Success = false;
265         break;
266       }
267       if (val.find('=') != StringRef::npos) {
268         Diags.Report(SourceLocation(),
269                      diag::err_analyzer_config_multiple_values)
270           << configVals[i];
271         Success = false;
272         break;
273       }
274       Opts.Config[key] = val;
275     }
276   }
277 
278   return Success;
279 }
280 
281 static bool ParseMigratorArgs(MigratorOptions &Opts, ArgList &Args) {
282   Opts.NoNSAllocReallocError = Args.hasArg(OPT_migrator_no_nsalloc_error);
283   Opts.NoFinalizeRemoval = Args.hasArg(OPT_migrator_no_finalize_removal);
284   return true;
285 }
286 
287 static void ParseCommentArgs(CommentOptions &Opts, ArgList &Args) {
288   Opts.BlockCommandNames = Args.getAllArgValues(OPT_fcomment_block_commands);
289   Opts.ParseAllComments = Args.hasArg(OPT_fparse_all_comments);
290 }
291 
292 static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
293                              DiagnosticsEngine &Diags) {
294   using namespace options;
295   bool Success = true;
296 
297   unsigned OptLevel = getOptimizationLevel(Args, IK, Diags);
298   if (OptLevel > 3) {
299     Diags.Report(diag::err_drv_invalid_value)
300       << Args.getLastArg(OPT_O)->getAsString(Args) << OptLevel;
301     OptLevel = 3;
302     Success = false;
303   }
304   Opts.OptimizationLevel = OptLevel;
305 
306   // We must always run at least the always inlining pass.
307   Opts.setInlining(
308     (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
309                                  : CodeGenOptions::OnlyAlwaysInlining);
310   // -fno-inline-functions overrides OptimizationLevel > 1.
311   Opts.NoInline = Args.hasArg(OPT_fno_inline);
312   Opts.setInlining(Args.hasArg(OPT_fno_inline_functions) ?
313                      CodeGenOptions::OnlyAlwaysInlining : Opts.getInlining());
314 
315   if (Args.hasArg(OPT_gline_tables_only)) {
316     Opts.setDebugInfo(CodeGenOptions::DebugLineTablesOnly);
317   } else if (Args.hasArg(OPT_g_Flag)) {
318     if (Args.hasFlag(OPT_flimit_debug_info, OPT_fno_limit_debug_info, true))
319       Opts.setDebugInfo(CodeGenOptions::LimitedDebugInfo);
320     else
321       Opts.setDebugInfo(CodeGenOptions::FullDebugInfo);
322   }
323   Opts.DebugColumnInfo = Args.hasArg(OPT_dwarf_column_info);
324   Opts.SplitDwarfFile = Args.getLastArgValue(OPT_split_dwarf_file);
325 
326   Opts.DisableLLVMOpts = Args.hasArg(OPT_disable_llvm_optzns);
327   Opts.DisableRedZone = Args.hasArg(OPT_disable_red_zone);
328   Opts.ForbidGuardVariables = Args.hasArg(OPT_fforbid_guard_variables);
329   Opts.UseRegisterSizedBitfieldAccess = Args.hasArg(
330     OPT_fuse_register_sized_bitfield_access);
331   Opts.RelaxedAliasing = Args.hasArg(OPT_relaxed_aliasing);
332   Opts.StructPathTBAA = Args.hasArg(OPT_struct_path_tbaa);
333   Opts.DwarfDebugFlags = Args.getLastArgValue(OPT_dwarf_debug_flags);
334   Opts.MergeAllConstants = !Args.hasArg(OPT_fno_merge_all_constants);
335   Opts.NoCommon = Args.hasArg(OPT_fno_common);
336   Opts.NoImplicitFloat = Args.hasArg(OPT_no_implicit_float);
337   Opts.OptimizeSize = getOptimizationLevelSize(Args);
338   Opts.SimplifyLibCalls = !(Args.hasArg(OPT_fno_builtin) ||
339                             Args.hasArg(OPT_ffreestanding));
340   Opts.UnrollLoops = Args.hasArg(OPT_funroll_loops) ||
341                      (Opts.OptimizationLevel > 1 && !Opts.OptimizeSize);
342 
343   Opts.Autolink = !Args.hasArg(OPT_fno_autolink);
344   Opts.AsmVerbose = Args.hasArg(OPT_masm_verbose);
345   Opts.ObjCAutoRefCountExceptions = Args.hasArg(OPT_fobjc_arc_exceptions);
346   Opts.CUDAIsDevice = Args.hasArg(OPT_fcuda_is_device);
347   Opts.CXAAtExit = !Args.hasArg(OPT_fno_use_cxa_atexit);
348   Opts.CXXCtorDtorAliases = Args.hasArg(OPT_mconstructor_aliases);
349   Opts.CodeModel = Args.getLastArgValue(OPT_mcode_model);
350   Opts.DebugPass = Args.getLastArgValue(OPT_mdebug_pass);
351   Opts.DisableFPElim = Args.hasArg(OPT_mdisable_fp_elim);
352   Opts.DisableTailCalls = Args.hasArg(OPT_mdisable_tail_calls);
353   Opts.FloatABI = Args.getLastArgValue(OPT_mfloat_abi);
354   Opts.HiddenWeakVTables = Args.hasArg(OPT_fhidden_weak_vtables);
355   Opts.LessPreciseFPMAD = Args.hasArg(OPT_cl_mad_enable);
356   Opts.LimitFloatPrecision = Args.getLastArgValue(OPT_mlimit_float_precision);
357   Opts.NoInfsFPMath = (Args.hasArg(OPT_menable_no_infinities) ||
358                        Args.hasArg(OPT_cl_finite_math_only)||
359                        Args.hasArg(OPT_cl_fast_relaxed_math));
360   Opts.NoNaNsFPMath = (Args.hasArg(OPT_menable_no_nans) ||
361                        Args.hasArg(OPT_cl_finite_math_only)||
362                        Args.hasArg(OPT_cl_fast_relaxed_math));
363   Opts.NoZeroInitializedInBSS = Args.hasArg(OPT_mno_zero_initialized_in_bss);
364   Opts.BackendOptions = Args.getAllArgValues(OPT_backend_option);
365   Opts.NumRegisterParameters = Args.getLastArgIntValue(OPT_mregparm, 0, Diags);
366   Opts.NoGlobalMerge = Args.hasArg(OPT_mno_global_merge);
367   Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
368   Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
369   Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
370   Opts.OmitLeafFramePointer = Args.hasArg(OPT_momit_leaf_frame_pointer);
371   Opts.SaveTempLabels = Args.hasArg(OPT_msave_temp_labels);
372   Opts.NoDwarf2CFIAsm = Args.hasArg(OPT_fno_dwarf2_cfi_asm);
373   Opts.NoDwarfDirectoryAsm = Args.hasArg(OPT_fno_dwarf_directory_asm);
374   Opts.SoftFloat = Args.hasArg(OPT_msoft_float);
375   Opts.StrictEnums = Args.hasArg(OPT_fstrict_enums);
376   Opts.UnsafeFPMath = Args.hasArg(OPT_menable_unsafe_fp_math) ||
377                       Args.hasArg(OPT_cl_unsafe_math_optimizations) ||
378                       Args.hasArg(OPT_cl_fast_relaxed_math);
379   Opts.UnwindTables = Args.hasArg(OPT_munwind_tables);
380   Opts.RelocationModel = Args.getLastArgValue(OPT_mrelocation_model, "pic");
381   Opts.TrapFuncName = Args.getLastArgValue(OPT_ftrap_function_EQ);
382   Opts.UseInitArray = Args.hasArg(OPT_fuse_init_array);
383 
384   Opts.FunctionSections = Args.hasArg(OPT_ffunction_sections);
385   Opts.DataSections = Args.hasArg(OPT_fdata_sections);
386 
387   Opts.MainFileName = Args.getLastArgValue(OPT_main_file_name);
388   Opts.VerifyModule = !Args.hasArg(OPT_disable_llvm_verifier);
389   Opts.SanitizeRecover = !Args.hasArg(OPT_fno_sanitize_recover);
390 
391   Opts.DisableGCov = Args.hasArg(OPT_test_coverage);
392   Opts.EmitGcovArcs = Args.hasArg(OPT_femit_coverage_data);
393   Opts.EmitGcovNotes = Args.hasArg(OPT_femit_coverage_notes);
394   if (Opts.EmitGcovArcs || Opts.EmitGcovNotes) {
395   Opts.CoverageFile = Args.getLastArgValue(OPT_coverage_file);
396     Opts.CoverageExtraChecksum = Args.hasArg(OPT_coverage_cfg_checksum);
397     Opts.CoverageNoFunctionNamesInData =
398         Args.hasArg(OPT_coverage_no_function_names_in_data);
399     if (Args.hasArg(OPT_coverage_version_EQ)) {
400       StringRef CoverageVersion = Args.getLastArgValue(OPT_coverage_version_EQ);
401       if (CoverageVersion.size() != 4) {
402         Diags.Report(diag::err_drv_invalid_value)
403             << Args.getLastArg(OPT_coverage_version_EQ)->getAsString(Args)
404             << CoverageVersion;
405       } else {
406         memcpy(Opts.CoverageVersion, CoverageVersion.data(), 4);
407       }
408     }
409   }
410 
411   Opts.InstrumentFunctions = Args.hasArg(OPT_finstrument_functions);
412   Opts.InstrumentForProfiling = Args.hasArg(OPT_pg);
413   Opts.EmitOpenCLArgMetadata = Args.hasArg(OPT_cl_kernel_arg_info);
414   Opts.DebugCompilationDir = Args.getLastArgValue(OPT_fdebug_compilation_dir);
415   Opts.LinkBitcodeFile = Args.getLastArgValue(OPT_mlink_bitcode_file);
416   Opts.SanitizerBlacklistFile = Args.getLastArgValue(OPT_fsanitize_blacklist);
417   Opts.SanitizeMemoryTrackOrigins =
418     Args.hasArg(OPT_fsanitize_memory_track_origins);
419   Opts.SanitizeAddressZeroBaseShadow =
420     Args.hasArg(OPT_fsanitize_address_zero_base_shadow);
421   Opts.SanitizeUndefinedTrapOnError =
422     Args.hasArg(OPT_fsanitize_undefined_trap_on_error);
423   Opts.SSPBufferSize =
424     Args.getLastArgIntValue(OPT_stack_protector_buffer_size, 8, Diags);
425   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);
426   if (Arg *A = Args.getLastArg(OPT_mstack_alignment)) {
427     StringRef Val = A->getValue();
428     unsigned StackAlignment = Opts.StackAlignment;
429     Val.getAsInteger(10, StackAlignment);
430     Opts.StackAlignment = StackAlignment;
431   }
432 
433   if (Arg *A = Args.getLastArg(OPT_fobjc_dispatch_method_EQ)) {
434     StringRef Name = A->getValue();
435     unsigned Method = llvm::StringSwitch<unsigned>(Name)
436       .Case("legacy", CodeGenOptions::Legacy)
437       .Case("non-legacy", CodeGenOptions::NonLegacy)
438       .Case("mixed", CodeGenOptions::Mixed)
439       .Default(~0U);
440     if (Method == ~0U) {
441       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
442       Success = false;
443     } else {
444       Opts.setObjCDispatchMethod(
445         static_cast<CodeGenOptions::ObjCDispatchMethodKind>(Method));
446     }
447   }
448 
449   if (Arg *A = Args.getLastArg(OPT_ftlsmodel_EQ)) {
450     StringRef Name = A->getValue();
451     unsigned Model = llvm::StringSwitch<unsigned>(Name)
452         .Case("global-dynamic", CodeGenOptions::GeneralDynamicTLSModel)
453         .Case("local-dynamic", CodeGenOptions::LocalDynamicTLSModel)
454         .Case("initial-exec", CodeGenOptions::InitialExecTLSModel)
455         .Case("local-exec", CodeGenOptions::LocalExecTLSModel)
456         .Default(~0U);
457     if (Model == ~0U) {
458       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
459       Success = false;
460     } else {
461       Opts.setDefaultTLSModel(static_cast<CodeGenOptions::TLSModel>(Model));
462     }
463   }
464 
465   if (Arg *A = Args.getLastArg(OPT_ffp_contract)) {
466     StringRef Val = A->getValue();
467     if (Val == "fast")
468       Opts.setFPContractMode(CodeGenOptions::FPC_Fast);
469     else if (Val == "on")
470       Opts.setFPContractMode(CodeGenOptions::FPC_On);
471     else if (Val == "off")
472       Opts.setFPContractMode(CodeGenOptions::FPC_Off);
473     else
474       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Val;
475   }
476 
477   return Success;
478 }
479 
480 static void ParseDependencyOutputArgs(DependencyOutputOptions &Opts,
481                                       ArgList &Args) {
482   using namespace options;
483   Opts.OutputFile = Args.getLastArgValue(OPT_dependency_file);
484   Opts.Targets = Args.getAllArgValues(OPT_MT);
485   Opts.IncludeSystemHeaders = Args.hasArg(OPT_sys_header_deps);
486   Opts.UsePhonyTargets = Args.hasArg(OPT_MP);
487   Opts.ShowHeaderIncludes = Args.hasArg(OPT_H);
488   Opts.HeaderIncludeOutputFile = Args.getLastArgValue(OPT_header_include_file);
489   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
490   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
491 }
492 
493 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
494                                 DiagnosticsEngine *Diags) {
495   using namespace options;
496   bool Success = true;
497 
498   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
499   Opts.DiagnosticSerializationFile =
500     Args.getLastArgValue(OPT_diagnostic_serialized_file);
501   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
502   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
503   Opts.Pedantic = Args.hasArg(OPT_pedantic);
504   Opts.PedanticErrors = Args.hasArg(OPT_pedantic_errors);
505   Opts.ShowCarets = !Args.hasArg(OPT_fno_caret_diagnostics);
506   Opts.ShowColors = Args.hasArg(OPT_fcolor_diagnostics);
507   Opts.ShowColumn = Args.hasFlag(OPT_fshow_column,
508                                  OPT_fno_show_column,
509                                  /*Default=*/true);
510   Opts.ShowFixits = !Args.hasArg(OPT_fno_diagnostics_fixit_info);
511   Opts.ShowLocation = !Args.hasArg(OPT_fno_show_source_location);
512   Opts.ShowOptionNames = Args.hasArg(OPT_fdiagnostics_show_option);
513 
514   // Default behavior is to not to show note include stacks.
515   Opts.ShowNoteIncludeStack = false;
516   if (Arg *A = Args.getLastArg(OPT_fdiagnostics_show_note_include_stack,
517                                OPT_fno_diagnostics_show_note_include_stack))
518     if (A->getOption().matches(OPT_fdiagnostics_show_note_include_stack))
519       Opts.ShowNoteIncludeStack = true;
520 
521   StringRef ShowOverloads =
522     Args.getLastArgValue(OPT_fshow_overloads_EQ, "all");
523   if (ShowOverloads == "best")
524     Opts.setShowOverloads(Ovl_Best);
525   else if (ShowOverloads == "all")
526     Opts.setShowOverloads(Ovl_All);
527   else {
528     Success = false;
529     if (Diags)
530       Diags->Report(diag::err_drv_invalid_value)
531       << Args.getLastArg(OPT_fshow_overloads_EQ)->getAsString(Args)
532       << ShowOverloads;
533   }
534 
535   StringRef ShowCategory =
536     Args.getLastArgValue(OPT_fdiagnostics_show_category, "none");
537   if (ShowCategory == "none")
538     Opts.ShowCategories = 0;
539   else if (ShowCategory == "id")
540     Opts.ShowCategories = 1;
541   else if (ShowCategory == "name")
542     Opts.ShowCategories = 2;
543   else {
544     Success = false;
545     if (Diags)
546       Diags->Report(diag::err_drv_invalid_value)
547       << Args.getLastArg(OPT_fdiagnostics_show_category)->getAsString(Args)
548       << ShowCategory;
549   }
550 
551   StringRef Format =
552     Args.getLastArgValue(OPT_fdiagnostics_format, "clang");
553   if (Format == "clang")
554     Opts.setFormat(DiagnosticOptions::Clang);
555   else if (Format == "msvc")
556     Opts.setFormat(DiagnosticOptions::Msvc);
557   else if (Format == "vi")
558     Opts.setFormat(DiagnosticOptions::Vi);
559   else {
560     Success = false;
561     if (Diags)
562       Diags->Report(diag::err_drv_invalid_value)
563       << Args.getLastArg(OPT_fdiagnostics_format)->getAsString(Args)
564       << Format;
565   }
566 
567   Opts.ShowSourceRanges = Args.hasArg(OPT_fdiagnostics_print_source_range_info);
568   Opts.ShowParseableFixits = Args.hasArg(OPT_fdiagnostics_parseable_fixits);
569   Opts.ShowPresumedLoc = !Args.hasArg(OPT_fno_diagnostics_use_presumed_location);
570   Opts.VerifyDiagnostics = Args.hasArg(OPT_verify);
571   Opts.ElideType = !Args.hasArg(OPT_fno_elide_type);
572   Opts.ShowTemplateTree = Args.hasArg(OPT_fdiagnostics_show_template_tree);
573   Opts.ErrorLimit = Args.getLastArgIntValue(OPT_ferror_limit, 0, Diags);
574   Opts.MacroBacktraceLimit
575     = Args.getLastArgIntValue(OPT_fmacro_backtrace_limit,
576                          DiagnosticOptions::DefaultMacroBacktraceLimit, Diags);
577   Opts.TemplateBacktraceLimit
578     = Args.getLastArgIntValue(OPT_ftemplate_backtrace_limit,
579                          DiagnosticOptions::DefaultTemplateBacktraceLimit,
580                          Diags);
581   Opts.ConstexprBacktraceLimit
582     = Args.getLastArgIntValue(OPT_fconstexpr_backtrace_limit,
583                          DiagnosticOptions::DefaultConstexprBacktraceLimit,
584                          Diags);
585   Opts.TabStop = Args.getLastArgIntValue(OPT_ftabstop,
586                                     DiagnosticOptions::DefaultTabStop, Diags);
587   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
588     Opts.TabStop = DiagnosticOptions::DefaultTabStop;
589     if (Diags)
590       Diags->Report(diag::warn_ignoring_ftabstop_value)
591       << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
592   }
593   Opts.MessageLength = Args.getLastArgIntValue(OPT_fmessage_length, 0, Diags);
594   addWarningArgs(Args, Opts.Warnings);
595 
596   return Success;
597 }
598 
599 static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
600   Opts.WorkingDir = Args.getLastArgValue(OPT_working_directory);
601 }
602 
603 static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
604                                    DiagnosticsEngine &Diags) {
605   using namespace options;
606   Opts.ProgramAction = frontend::ParseSyntaxOnly;
607   if (const Arg *A = Args.getLastArg(OPT_Action_Group)) {
608     switch (A->getOption().getID()) {
609     default:
610       llvm_unreachable("Invalid option in group!");
611     case OPT_ast_list:
612       Opts.ProgramAction = frontend::ASTDeclList; break;
613     case OPT_ast_dump:
614       Opts.ProgramAction = frontend::ASTDump; break;
615     case OPT_ast_dump_xml:
616       Opts.ProgramAction = frontend::ASTDumpXML; break;
617     case OPT_ast_print:
618       Opts.ProgramAction = frontend::ASTPrint; break;
619     case OPT_ast_view:
620       Opts.ProgramAction = frontend::ASTView; break;
621     case OPT_dump_raw_tokens:
622       Opts.ProgramAction = frontend::DumpRawTokens; break;
623     case OPT_dump_tokens:
624       Opts.ProgramAction = frontend::DumpTokens; break;
625     case OPT_S:
626       Opts.ProgramAction = frontend::EmitAssembly; break;
627     case OPT_emit_llvm_bc:
628       Opts.ProgramAction = frontend::EmitBC; break;
629     case OPT_emit_html:
630       Opts.ProgramAction = frontend::EmitHTML; break;
631     case OPT_emit_llvm:
632       Opts.ProgramAction = frontend::EmitLLVM; break;
633     case OPT_emit_llvm_only:
634       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
635     case OPT_emit_codegen_only:
636       Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
637     case OPT_emit_obj:
638       Opts.ProgramAction = frontend::EmitObj; break;
639     case OPT_fixit_EQ:
640       Opts.FixItSuffix = A->getValue();
641       // fall-through!
642     case OPT_fixit:
643       Opts.ProgramAction = frontend::FixIt; break;
644     case OPT_emit_module:
645       Opts.ProgramAction = frontend::GenerateModule; break;
646     case OPT_emit_pch:
647       Opts.ProgramAction = frontend::GeneratePCH; break;
648     case OPT_emit_pth:
649       Opts.ProgramAction = frontend::GeneratePTH; break;
650     case OPT_init_only:
651       Opts.ProgramAction = frontend::InitOnly; break;
652     case OPT_fsyntax_only:
653       Opts.ProgramAction = frontend::ParseSyntaxOnly; break;
654     case OPT_module_file_info:
655       Opts.ProgramAction = frontend::ModuleFileInfo; break;
656     case OPT_print_decl_contexts:
657       Opts.ProgramAction = frontend::PrintDeclContext; break;
658     case OPT_print_preamble:
659       Opts.ProgramAction = frontend::PrintPreamble; break;
660     case OPT_E:
661       Opts.ProgramAction = frontend::PrintPreprocessedInput; break;
662     case OPT_rewrite_macros:
663       Opts.ProgramAction = frontend::RewriteMacros; break;
664     case OPT_rewrite_objc:
665       Opts.ProgramAction = frontend::RewriteObjC; break;
666     case OPT_rewrite_test:
667       Opts.ProgramAction = frontend::RewriteTest; break;
668     case OPT_analyze:
669       Opts.ProgramAction = frontend::RunAnalysis; break;
670     case OPT_migrate:
671       Opts.ProgramAction = frontend::MigrateSource; break;
672     case OPT_Eonly:
673       Opts.ProgramAction = frontend::RunPreprocessorOnly; break;
674     }
675   }
676 
677   if (const Arg* A = Args.getLastArg(OPT_plugin)) {
678     Opts.Plugins.push_back(A->getValue(0));
679     Opts.ProgramAction = frontend::PluginAction;
680     Opts.ActionName = A->getValue();
681 
682     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
683            end = Args.filtered_end(); it != end; ++it) {
684       if ((*it)->getValue(0) == Opts.ActionName)
685         Opts.PluginArgs.push_back((*it)->getValue(1));
686     }
687   }
688 
689   Opts.AddPluginActions = Args.getAllArgValues(OPT_add_plugin);
690   Opts.AddPluginArgs.resize(Opts.AddPluginActions.size());
691   for (int i = 0, e = Opts.AddPluginActions.size(); i != e; ++i) {
692     for (arg_iterator it = Args.filtered_begin(OPT_plugin_arg),
693            end = Args.filtered_end(); it != end; ++it) {
694       if ((*it)->getValue(0) == Opts.AddPluginActions[i])
695         Opts.AddPluginArgs[i].push_back((*it)->getValue(1));
696     }
697   }
698 
699   if (const Arg *A = Args.getLastArg(OPT_code_completion_at)) {
700     Opts.CodeCompletionAt =
701       ParsedSourceLocation::FromString(A->getValue());
702     if (Opts.CodeCompletionAt.FileName.empty())
703       Diags.Report(diag::err_drv_invalid_value)
704         << A->getAsString(Args) << A->getValue();
705   }
706   Opts.DisableFree = Args.hasArg(OPT_disable_free);
707 
708   Opts.OutputFile = Args.getLastArgValue(OPT_o);
709   Opts.Plugins = Args.getAllArgValues(OPT_load);
710   Opts.RelocatablePCH = Args.hasArg(OPT_relocatable_pch);
711   Opts.ShowHelp = Args.hasArg(OPT_help);
712   Opts.ShowStats = Args.hasArg(OPT_print_stats);
713   Opts.ShowTimers = Args.hasArg(OPT_ftime_report);
714   Opts.ShowVersion = Args.hasArg(OPT_version);
715   Opts.ASTMergeFiles = Args.getAllArgValues(OPT_ast_merge);
716   Opts.LLVMArgs = Args.getAllArgValues(OPT_mllvm);
717   Opts.FixWhatYouCan = Args.hasArg(OPT_fix_what_you_can);
718   Opts.FixOnlyWarnings = Args.hasArg(OPT_fix_only_warnings);
719   Opts.FixAndRecompile = Args.hasArg(OPT_fixit_recompile);
720   Opts.FixToTemporaries = Args.hasArg(OPT_fixit_to_temp);
721   Opts.ASTDumpFilter = Args.getLastArgValue(OPT_ast_dump_filter);
722   Opts.UseGlobalModuleIndex = !Args.hasArg(OPT_fno_modules_global_index);
723   Opts.GenerateGlobalModuleIndex = Opts.UseGlobalModuleIndex;
724 
725   Opts.CodeCompleteOpts.IncludeMacros
726     = Args.hasArg(OPT_code_completion_macros);
727   Opts.CodeCompleteOpts.IncludeCodePatterns
728     = Args.hasArg(OPT_code_completion_patterns);
729   Opts.CodeCompleteOpts.IncludeGlobals
730     = !Args.hasArg(OPT_no_code_completion_globals);
731   Opts.CodeCompleteOpts.IncludeBriefComments
732     = Args.hasArg(OPT_code_completion_brief_comments);
733 
734   Opts.OverrideRecordLayoutsFile
735     = Args.getLastArgValue(OPT_foverride_record_layout_EQ);
736   if (const Arg *A = Args.getLastArg(OPT_arcmt_check,
737                                      OPT_arcmt_modify,
738                                      OPT_arcmt_migrate)) {
739     switch (A->getOption().getID()) {
740     default:
741       llvm_unreachable("missed a case");
742     case OPT_arcmt_check:
743       Opts.ARCMTAction = FrontendOptions::ARCMT_Check;
744       break;
745     case OPT_arcmt_modify:
746       Opts.ARCMTAction = FrontendOptions::ARCMT_Modify;
747       break;
748     case OPT_arcmt_migrate:
749       Opts.ARCMTAction = FrontendOptions::ARCMT_Migrate;
750       break;
751     }
752   }
753   Opts.MTMigrateDir = Args.getLastArgValue(OPT_mt_migrate_directory);
754   Opts.ARCMTMigrateReportOut
755     = Args.getLastArgValue(OPT_arcmt_migrate_report_output);
756   Opts.ARCMTMigrateEmitARCErrors
757     = Args.hasArg(OPT_arcmt_migrate_emit_arc_errors);
758 
759   if (Args.hasArg(OPT_objcmt_migrate_literals))
760     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Literals;
761   if (Args.hasArg(OPT_objcmt_migrate_subscripting))
762     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_Subscripting;
763 
764   if (Opts.ARCMTAction != FrontendOptions::ARCMT_None &&
765       Opts.ObjCMTAction != FrontendOptions::ObjCMT_None) {
766     Diags.Report(diag::err_drv_argument_not_allowed_with)
767       << "ARC migration" << "ObjC migration";
768   }
769 
770   InputKind DashX = IK_None;
771   if (const Arg *A = Args.getLastArg(OPT_x)) {
772     DashX = llvm::StringSwitch<InputKind>(A->getValue())
773       .Case("c", IK_C)
774       .Case("cl", IK_OpenCL)
775       .Case("cuda", IK_CUDA)
776       .Case("c++", IK_CXX)
777       .Case("objective-c", IK_ObjC)
778       .Case("objective-c++", IK_ObjCXX)
779       .Case("cpp-output", IK_PreprocessedC)
780       .Case("assembler-with-cpp", IK_Asm)
781       .Case("c++-cpp-output", IK_PreprocessedCXX)
782       .Case("objective-c-cpp-output", IK_PreprocessedObjC)
783       .Case("objc-cpp-output", IK_PreprocessedObjC)
784       .Case("objective-c++-cpp-output", IK_PreprocessedObjCXX)
785       .Case("objc++-cpp-output", IK_PreprocessedObjCXX)
786       .Case("c-header", IK_C)
787       .Case("cl-header", IK_OpenCL)
788       .Case("objective-c-header", IK_ObjC)
789       .Case("c++-header", IK_CXX)
790       .Case("objective-c++-header", IK_ObjCXX)
791       .Cases("ast", "pcm", IK_AST)
792       .Case("ir", IK_LLVM_IR)
793       .Default(IK_None);
794     if (DashX == IK_None)
795       Diags.Report(diag::err_drv_invalid_value)
796         << A->getAsString(Args) << A->getValue();
797   }
798 
799   // '-' is the default input if none is given.
800   std::vector<std::string> Inputs = Args.getAllArgValues(OPT_INPUT);
801   Opts.Inputs.clear();
802   if (Inputs.empty())
803     Inputs.push_back("-");
804   for (unsigned i = 0, e = Inputs.size(); i != e; ++i) {
805     InputKind IK = DashX;
806     if (IK == IK_None) {
807       IK = FrontendOptions::getInputKindForExtension(
808         StringRef(Inputs[i]).rsplit('.').second);
809       // FIXME: Remove this hack.
810       if (i == 0)
811         DashX = IK;
812     }
813     Opts.Inputs.push_back(FrontendInputFile(Inputs[i], IK));
814   }
815 
816   return DashX;
817 }
818 
819 std::string CompilerInvocation::GetResourcesPath(const char *Argv0,
820                                                  void *MainAddr) {
821   llvm::sys::Path P = llvm::sys::Path::GetMainExecutable(Argv0, MainAddr);
822 
823   if (!P.isEmpty()) {
824     P.eraseComponent();  // Remove /clang from foo/bin/clang
825     P.eraseComponent();  // Remove /bin   from foo/bin
826 
827     // Get foo/lib/clang/<version>/include
828     P.appendComponent("lib");
829     P.appendComponent("clang");
830     P.appendComponent(CLANG_VERSION_STRING);
831   }
832 
833   return P.str();
834 }
835 
836 static void ParseHeaderSearchArgs(HeaderSearchOptions &Opts, ArgList &Args) {
837   using namespace options;
838   Opts.Sysroot = Args.getLastArgValue(OPT_isysroot, "/");
839   Opts.Verbose = Args.hasArg(OPT_v);
840   Opts.UseBuiltinIncludes = !Args.hasArg(OPT_nobuiltininc);
841   Opts.UseStandardSystemIncludes = !Args.hasArg(OPT_nostdsysteminc);
842   Opts.UseStandardCXXIncludes = !Args.hasArg(OPT_nostdincxx);
843   if (const Arg *A = Args.getLastArg(OPT_stdlib_EQ))
844     Opts.UseLibcxx = (strcmp(A->getValue(), "libc++") == 0);
845   Opts.ResourceDir = Args.getLastArgValue(OPT_resource_dir);
846   Opts.ModuleCachePath = Args.getLastArgValue(OPT_fmodules_cache_path);
847   Opts.DisableModuleHash = Args.hasArg(OPT_fdisable_module_hash);
848   Opts.ModuleCachePruneInterval
849     = Args.getLastArgIntValue(OPT_fmodules_prune_interval, 7*24*60*60);
850   Opts.ModuleCachePruneAfter
851     = Args.getLastArgIntValue(OPT_fmodules_prune_after, 31*24*60*60);
852   for (arg_iterator it = Args.filtered_begin(OPT_fmodules_ignore_macro),
853        ie = Args.filtered_end(); it != ie; ++it) {
854     StringRef MacroDef = (*it)->getValue();
855     Opts.ModulesIgnoreMacros.insert(MacroDef.split('=').first);
856   }
857 
858   // Add -I..., -F..., and -index-header-map options in order.
859   bool IsIndexHeaderMap = false;
860   for (arg_iterator it = Args.filtered_begin(OPT_I, OPT_F,
861                                              OPT_index_header_map),
862        ie = Args.filtered_end(); it != ie; ++it) {
863     if ((*it)->getOption().matches(OPT_index_header_map)) {
864       // -index-header-map applies to the next -I or -F.
865       IsIndexHeaderMap = true;
866       continue;
867     }
868 
869     frontend::IncludeDirGroup Group
870       = IsIndexHeaderMap? frontend::IndexHeaderMap : frontend::Angled;
871 
872     Opts.AddPath((*it)->getValue(), Group,
873                  /*IsFramework=*/ (*it)->getOption().matches(OPT_F), true);
874     IsIndexHeaderMap = false;
875   }
876 
877   // Add -iprefix/-iwithprefix/-iwithprefixbefore options.
878   StringRef Prefix = ""; // FIXME: This isn't the correct default prefix.
879   for (arg_iterator it = Args.filtered_begin(OPT_iprefix, OPT_iwithprefix,
880                                              OPT_iwithprefixbefore),
881          ie = Args.filtered_end(); it != ie; ++it) {
882     const Arg *A = *it;
883     if (A->getOption().matches(OPT_iprefix))
884       Prefix = A->getValue();
885     else if (A->getOption().matches(OPT_iwithprefix))
886       Opts.AddPath(Prefix.str() + A->getValue(),
887                    frontend::After, false, true);
888     else
889       Opts.AddPath(Prefix.str() + A->getValue(),
890                    frontend::Angled, false, true);
891   }
892 
893   for (arg_iterator it = Args.filtered_begin(OPT_idirafter),
894          ie = Args.filtered_end(); it != ie; ++it)
895     Opts.AddPath((*it)->getValue(), frontend::After, false, true);
896   for (arg_iterator it = Args.filtered_begin(OPT_iquote),
897          ie = Args.filtered_end(); it != ie; ++it)
898     Opts.AddPath((*it)->getValue(), frontend::Quoted, false, true);
899   for (arg_iterator it = Args.filtered_begin(OPT_isystem,
900          OPT_iwithsysroot), ie = Args.filtered_end(); it != ie; ++it)
901     Opts.AddPath((*it)->getValue(), frontend::System, false,
902                  !(*it)->getOption().matches(OPT_iwithsysroot));
903   for (arg_iterator it = Args.filtered_begin(OPT_iframework),
904          ie = Args.filtered_end(); it != ie; ++it)
905     Opts.AddPath((*it)->getValue(), frontend::System, true, true);
906 
907   // Add the paths for the various language specific isystem flags.
908   for (arg_iterator it = Args.filtered_begin(OPT_c_isystem),
909        ie = Args.filtered_end(); it != ie; ++it)
910     Opts.AddPath((*it)->getValue(), frontend::CSystem, false, true);
911   for (arg_iterator it = Args.filtered_begin(OPT_cxx_isystem),
912        ie = Args.filtered_end(); it != ie; ++it)
913     Opts.AddPath((*it)->getValue(), frontend::CXXSystem, false, true);
914   for (arg_iterator it = Args.filtered_begin(OPT_objc_isystem),
915        ie = Args.filtered_end(); it != ie; ++it)
916     Opts.AddPath((*it)->getValue(), frontend::ObjCSystem, false,true);
917   for (arg_iterator it = Args.filtered_begin(OPT_objcxx_isystem),
918        ie = Args.filtered_end(); it != ie; ++it)
919     Opts.AddPath((*it)->getValue(), frontend::ObjCXXSystem, false, true);
920 
921   // Add the internal paths from a driver that detects standard include paths.
922   for (arg_iterator I = Args.filtered_begin(OPT_internal_isystem,
923                                             OPT_internal_externc_isystem),
924                     E = Args.filtered_end();
925        I != E; ++I) {
926     frontend::IncludeDirGroup Group = frontend::System;
927     if ((*I)->getOption().matches(OPT_internal_externc_isystem))
928       Group = frontend::ExternCSystem;
929     Opts.AddPath((*I)->getValue(), Group, false, true);
930   }
931 
932   // Add the path prefixes which are implicitly treated as being system headers.
933   for (arg_iterator I = Args.filtered_begin(OPT_isystem_prefix,
934                                             OPT_ino_system_prefix),
935                     E = Args.filtered_end();
936        I != E; ++I)
937     Opts.AddSystemHeaderPrefix((*I)->getValue(),
938                                (*I)->getOption().matches(OPT_isystem_prefix));
939 }
940 
941 void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
942                                          LangStandard::Kind LangStd) {
943   // Set some properties which depend solely on the input kind; it would be nice
944   // to move these to the language standard, and have the driver resolve the
945   // input kind + language standard.
946   if (IK == IK_Asm) {
947     Opts.AsmPreprocessor = 1;
948   } else if (IK == IK_ObjC ||
949              IK == IK_ObjCXX ||
950              IK == IK_PreprocessedObjC ||
951              IK == IK_PreprocessedObjCXX) {
952     Opts.ObjC1 = Opts.ObjC2 = 1;
953   }
954 
955   if (LangStd == LangStandard::lang_unspecified) {
956     // Based on the base language, pick one.
957     switch (IK) {
958     case IK_None:
959     case IK_AST:
960     case IK_LLVM_IR:
961       llvm_unreachable("Invalid input kind!");
962     case IK_OpenCL:
963       LangStd = LangStandard::lang_opencl;
964       break;
965     case IK_CUDA:
966       LangStd = LangStandard::lang_cuda;
967       break;
968     case IK_Asm:
969     case IK_C:
970     case IK_PreprocessedC:
971     case IK_ObjC:
972     case IK_PreprocessedObjC:
973       LangStd = LangStandard::lang_gnu99;
974       break;
975     case IK_CXX:
976     case IK_PreprocessedCXX:
977     case IK_ObjCXX:
978     case IK_PreprocessedObjCXX:
979       LangStd = LangStandard::lang_gnucxx98;
980       break;
981     }
982   }
983 
984   const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
985   Opts.LineComment = Std.hasLineComments();
986   Opts.C99 = Std.isC99();
987   Opts.C11 = Std.isC11();
988   Opts.CPlusPlus = Std.isCPlusPlus();
989   Opts.CPlusPlus11 = Std.isCPlusPlus11();
990   Opts.CPlusPlus1y = Std.isCPlusPlus1y();
991   Opts.Digraphs = Std.hasDigraphs();
992   Opts.GNUMode = Std.isGNUMode();
993   Opts.GNUInline = !Std.isC99();
994   Opts.HexFloats = Std.hasHexFloats();
995   Opts.ImplicitInt = Std.hasImplicitInt();
996 
997   // Set OpenCL Version.
998   if (LangStd == LangStandard::lang_opencl) {
999     Opts.OpenCL = 1;
1000     Opts.OpenCLVersion = 100;
1001   }
1002   else if (LangStd == LangStandard::lang_opencl11) {
1003       Opts.OpenCL = 1;
1004       Opts.OpenCLVersion = 110;
1005   }
1006   else if (LangStd == LangStandard::lang_opencl12) {
1007     Opts.OpenCL = 1;
1008     Opts.OpenCLVersion = 120;
1009   }
1010 
1011   // OpenCL has some additional defaults.
1012   if (Opts.OpenCL) {
1013     Opts.AltiVec = 0;
1014     Opts.CXXOperatorNames = 1;
1015     Opts.LaxVectorConversions = 0;
1016     Opts.DefaultFPContract = 1;
1017     Opts.NativeHalfType = 1;
1018   }
1019 
1020   if (LangStd == LangStandard::lang_cuda)
1021     Opts.CUDA = 1;
1022 
1023   // OpenCL and C++ both have bool, true, false keywords.
1024   Opts.Bool = Opts.OpenCL || Opts.CPlusPlus;
1025 
1026   // C++ has wchar_t keyword.
1027   Opts.WChar = Opts.CPlusPlus;
1028 
1029   Opts.GNUKeywords = Opts.GNUMode;
1030   Opts.CXXOperatorNames = Opts.CPlusPlus;
1031 
1032   // Mimicing gcc's behavior, trigraphs are only enabled if -trigraphs
1033   // is specified, or -std is set to a conforming mode.
1034   Opts.Trigraphs = !Opts.GNUMode;
1035 
1036   Opts.DollarIdents = !Opts.AsmPreprocessor;
1037 }
1038 
1039 /// Attempt to parse a visibility value out of the given argument.
1040 static Visibility parseVisibility(Arg *arg, ArgList &args,
1041                                   DiagnosticsEngine &diags) {
1042   StringRef value = arg->getValue();
1043   if (value == "default") {
1044     return DefaultVisibility;
1045   } else if (value == "hidden") {
1046     return HiddenVisibility;
1047   } else if (value == "protected") {
1048     // FIXME: diagnose if target does not support protected visibility
1049     return ProtectedVisibility;
1050   }
1051 
1052   diags.Report(diag::err_drv_invalid_value)
1053     << arg->getAsString(args) << value;
1054   return DefaultVisibility;
1055 }
1056 
1057 static void ParseLangArgs(LangOptions &Opts, ArgList &Args, InputKind IK,
1058                           DiagnosticsEngine &Diags) {
1059   // FIXME: Cleanup per-file based stuff.
1060   LangStandard::Kind LangStd = LangStandard::lang_unspecified;
1061   if (const Arg *A = Args.getLastArg(OPT_std_EQ)) {
1062     LangStd = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1063 #define LANGSTANDARD(id, name, desc, features) \
1064       .Case(name, LangStandard::lang_##id)
1065 #include "clang/Frontend/LangStandards.def"
1066       .Default(LangStandard::lang_unspecified);
1067     if (LangStd == LangStandard::lang_unspecified)
1068       Diags.Report(diag::err_drv_invalid_value)
1069         << A->getAsString(Args) << A->getValue();
1070     else {
1071       // Valid standard, check to make sure language and standard are compatable.
1072       const LangStandard &Std = LangStandard::getLangStandardForKind(LangStd);
1073       switch (IK) {
1074       case IK_C:
1075       case IK_ObjC:
1076       case IK_PreprocessedC:
1077       case IK_PreprocessedObjC:
1078         if (!(Std.isC89() || Std.isC99()))
1079           Diags.Report(diag::err_drv_argument_not_allowed_with)
1080             << A->getAsString(Args) << "C/ObjC";
1081         break;
1082       case IK_CXX:
1083       case IK_ObjCXX:
1084       case IK_PreprocessedCXX:
1085       case IK_PreprocessedObjCXX:
1086         if (!Std.isCPlusPlus())
1087           Diags.Report(diag::err_drv_argument_not_allowed_with)
1088             << A->getAsString(Args) << "C++/ObjC++";
1089         break;
1090       case IK_OpenCL:
1091         if (!Std.isC99())
1092           Diags.Report(diag::err_drv_argument_not_allowed_with)
1093             << A->getAsString(Args) << "OpenCL";
1094         break;
1095       case IK_CUDA:
1096         if (!Std.isCPlusPlus())
1097           Diags.Report(diag::err_drv_argument_not_allowed_with)
1098             << A->getAsString(Args) << "CUDA";
1099         break;
1100       default:
1101         break;
1102       }
1103     }
1104   }
1105 
1106   // -cl-std only applies for OpenCL language standards.
1107   // Override the -std option in this case.
1108   if (const Arg *A = Args.getLastArg(OPT_cl_std_EQ)) {
1109     LangStandard::Kind OpenCLLangStd
1110     = llvm::StringSwitch<LangStandard::Kind>(A->getValue())
1111     .Case("CL", LangStandard::lang_opencl)
1112     .Case("CL1.1", LangStandard::lang_opencl11)
1113     .Case("CL1.2", LangStandard::lang_opencl12)
1114     .Default(LangStandard::lang_unspecified);
1115 
1116     if (OpenCLLangStd == LangStandard::lang_unspecified) {
1117       Diags.Report(diag::err_drv_invalid_value)
1118       << A->getAsString(Args) << A->getValue();
1119     }
1120     else
1121       LangStd = OpenCLLangStd;
1122   }
1123 
1124   CompilerInvocation::setLangDefaults(Opts, IK, LangStd);
1125 
1126   // We abuse '-f[no-]gnu-keywords' to force overriding all GNU-extension
1127   // keywords. This behavior is provided by GCC's poorly named '-fasm' flag,
1128   // while a subset (the non-C++ GNU keywords) is provided by GCC's
1129   // '-fgnu-keywords'. Clang conflates the two for simplicity under the single
1130   // name, as it doesn't seem a useful distinction.
1131   Opts.GNUKeywords = Args.hasFlag(OPT_fgnu_keywords, OPT_fno_gnu_keywords,
1132                                   Opts.GNUKeywords);
1133 
1134   if (Args.hasArg(OPT_fno_operator_names))
1135     Opts.CXXOperatorNames = 0;
1136 
1137   if (Opts.ObjC1) {
1138     if (Arg *arg = Args.getLastArg(OPT_fobjc_runtime_EQ)) {
1139       StringRef value = arg->getValue();
1140       if (Opts.ObjCRuntime.tryParse(value))
1141         Diags.Report(diag::err_drv_unknown_objc_runtime) << value;
1142     }
1143 
1144     if (Args.hasArg(OPT_fobjc_gc_only))
1145       Opts.setGC(LangOptions::GCOnly);
1146     else if (Args.hasArg(OPT_fobjc_gc))
1147       Opts.setGC(LangOptions::HybridGC);
1148     else if (Args.hasArg(OPT_fobjc_arc)) {
1149       Opts.ObjCAutoRefCount = 1;
1150       if (!Opts.ObjCRuntime.allowsARC())
1151         Diags.Report(diag::err_arc_unsupported_on_runtime);
1152 
1153       // Only set ObjCARCWeak if ARC is enabled.
1154       if (Args.hasArg(OPT_fobjc_runtime_has_weak))
1155         Opts.ObjCARCWeak = 1;
1156       else
1157         Opts.ObjCARCWeak = Opts.ObjCRuntime.allowsWeak();
1158     }
1159 
1160     if (Args.hasArg(OPT_fno_objc_infer_related_result_type))
1161       Opts.ObjCInferRelatedResultType = 0;
1162   }
1163 
1164   if (Args.hasArg(OPT_fgnu89_inline))
1165     Opts.GNUInline = 1;
1166 
1167   if (Args.hasArg(OPT_fapple_kext)) {
1168     if (!Opts.CPlusPlus)
1169       Diags.Report(diag::warn_c_kext);
1170     else
1171       Opts.AppleKext = 1;
1172   }
1173 
1174   if (Args.hasArg(OPT_print_ivar_layout))
1175     Opts.ObjCGCBitmapPrint = 1;
1176   if (Args.hasArg(OPT_fno_constant_cfstrings))
1177     Opts.NoConstantCFStrings = 1;
1178 
1179   if (Args.hasArg(OPT_faltivec))
1180     Opts.AltiVec = 1;
1181 
1182   if (Args.hasArg(OPT_pthread))
1183     Opts.POSIXThreads = 1;
1184 
1185   // The value-visibility mode defaults to "default".
1186   if (Arg *visOpt = Args.getLastArg(OPT_fvisibility)) {
1187     Opts.setValueVisibilityMode(parseVisibility(visOpt, Args, Diags));
1188   } else {
1189     Opts.setValueVisibilityMode(DefaultVisibility);
1190   }
1191 
1192   // The type-visibility mode defaults to the value-visibility mode.
1193   if (Arg *typeVisOpt = Args.getLastArg(OPT_ftype_visibility)) {
1194     Opts.setTypeVisibilityMode(parseVisibility(typeVisOpt, Args, Diags));
1195   } else {
1196     Opts.setTypeVisibilityMode(Opts.getValueVisibilityMode());
1197   }
1198 
1199   if (Args.hasArg(OPT_fvisibility_inlines_hidden))
1200     Opts.InlineVisibilityHidden = 1;
1201 
1202   if (Args.hasArg(OPT_ftrapv)) {
1203     Opts.setSignedOverflowBehavior(LangOptions::SOB_Trapping);
1204     // Set the handler, if one is specified.
1205     Opts.OverflowHandler =
1206         Args.getLastArgValue(OPT_ftrapv_handler);
1207   }
1208   else if (Args.hasArg(OPT_fwrapv))
1209     Opts.setSignedOverflowBehavior(LangOptions::SOB_Defined);
1210 
1211   if (Args.hasArg(OPT_trigraphs))
1212     Opts.Trigraphs = 1;
1213 
1214   Opts.DollarIdents = Args.hasFlag(OPT_fdollars_in_identifiers,
1215                                    OPT_fno_dollars_in_identifiers,
1216                                    Opts.DollarIdents);
1217   Opts.PascalStrings = Args.hasArg(OPT_fpascal_strings);
1218   Opts.MicrosoftExt
1219     = Args.hasArg(OPT_fms_extensions) || Args.hasArg(OPT_fms_compatibility);
1220   Opts.MicrosoftMode = Args.hasArg(OPT_fms_compatibility);
1221   Opts.AsmBlocks = Args.hasArg(OPT_fasm_blocks) || Opts.MicrosoftExt;
1222   Opts.MSCVersion = Args.getLastArgIntValue(OPT_fmsc_version, 0, Diags);
1223   Opts.Borland = Args.hasArg(OPT_fborland_extensions);
1224   Opts.WritableStrings = Args.hasArg(OPT_fwritable_strings);
1225   Opts.ConstStrings = Args.hasFlag(OPT_fconst_strings, OPT_fno_const_strings,
1226                                    Opts.ConstStrings);
1227   if (Args.hasArg(OPT_fno_lax_vector_conversions))
1228     Opts.LaxVectorConversions = 0;
1229   if (Args.hasArg(OPT_fno_threadsafe_statics))
1230     Opts.ThreadsafeStatics = 0;
1231   Opts.Exceptions = Args.hasArg(OPT_fexceptions);
1232   Opts.ObjCExceptions = Args.hasArg(OPT_fobjc_exceptions);
1233   Opts.CXXExceptions = Args.hasArg(OPT_fcxx_exceptions);
1234   Opts.SjLjExceptions = Args.hasArg(OPT_fsjlj_exceptions);
1235   Opts.TraditionalCPP = Args.hasArg(OPT_traditional_cpp);
1236 
1237   Opts.RTTI = !Args.hasArg(OPT_fno_rtti);
1238   Opts.Blocks = Args.hasArg(OPT_fblocks);
1239   Opts.BlocksRuntimeOptional = Args.hasArg(OPT_fblocks_runtime_optional);
1240   Opts.Modules = Args.hasArg(OPT_fmodules);
1241   Opts.CharIsSigned = !Args.hasArg(OPT_fno_signed_char);
1242   Opts.WChar = Opts.CPlusPlus && !Args.hasArg(OPT_fno_wchar);
1243   Opts.ShortWChar = Args.hasArg(OPT_fshort_wchar);
1244   Opts.ShortEnums = Args.hasArg(OPT_fshort_enums);
1245   Opts.Freestanding = Args.hasArg(OPT_ffreestanding);
1246   Opts.NoBuiltin = Args.hasArg(OPT_fno_builtin) || Opts.Freestanding;
1247   Opts.AssumeSaneOperatorNew = !Args.hasArg(OPT_fno_assume_sane_operator_new);
1248   Opts.HeinousExtensions = Args.hasArg(OPT_fheinous_gnu_extensions);
1249   Opts.AccessControl = !Args.hasArg(OPT_fno_access_control);
1250   Opts.ElideConstructors = !Args.hasArg(OPT_fno_elide_constructors);
1251   Opts.MathErrno = Args.hasArg(OPT_fmath_errno);
1252   Opts.InstantiationDepth = Args.getLastArgIntValue(OPT_ftemplate_depth, 256,
1253                                                     Diags);
1254   Opts.ConstexprCallDepth = Args.getLastArgIntValue(OPT_fconstexpr_depth, 512,
1255                                                     Diags);
1256   Opts.ConstexprStepLimit = Args.getLastArgIntValue(OPT_fconstexpr_steps,
1257                                                     1048576, Diags);
1258   Opts.BracketDepth = Args.getLastArgIntValue(OPT_fbracket_depth, 256, Diags);
1259   Opts.DelayedTemplateParsing = Args.hasArg(OPT_fdelayed_template_parsing);
1260   Opts.NumLargeByValueCopy = Args.getLastArgIntValue(OPT_Wlarge_by_value_copy_EQ,
1261                                                     0, Diags);
1262   Opts.MSBitfields = Args.hasArg(OPT_mms_bitfields);
1263   Opts.ObjCConstantStringClass =
1264     Args.getLastArgValue(OPT_fconstant_string_class);
1265   Opts.ObjCDefaultSynthProperties =
1266     Args.hasArg(OPT_fobjc_default_synthesize_properties);
1267   Opts.EncodeExtendedBlockSig =
1268     Args.hasArg(OPT_fencode_extended_block_signature);
1269   Opts.EmitAllDecls = Args.hasArg(OPT_femit_all_decls);
1270   Opts.PackStruct = Args.getLastArgIntValue(OPT_fpack_struct_EQ, 0, Diags);
1271   Opts.PICLevel = Args.getLastArgIntValue(OPT_pic_level, 0, Diags);
1272   Opts.PIELevel = Args.getLastArgIntValue(OPT_pie_level, 0, Diags);
1273   Opts.Static = Args.hasArg(OPT_static_define);
1274   Opts.DumpRecordLayoutsSimple = Args.hasArg(OPT_fdump_record_layouts_simple);
1275   Opts.DumpRecordLayouts = Opts.DumpRecordLayoutsSimple
1276                         || Args.hasArg(OPT_fdump_record_layouts);
1277   Opts.DumpVTableLayouts = Args.hasArg(OPT_fdump_vtable_layouts);
1278   Opts.SpellChecking = !Args.hasArg(OPT_fno_spell_checking);
1279   Opts.NoBitFieldTypeAlign = Args.hasArg(OPT_fno_bitfield_type_align);
1280   Opts.SinglePrecisionConstants = Args.hasArg(OPT_cl_single_precision_constant);
1281   Opts.FastRelaxedMath = Args.hasArg(OPT_cl_fast_relaxed_math);
1282   Opts.MRTD = Args.hasArg(OPT_mrtd);
1283   Opts.HexagonQdsp6Compat = Args.hasArg(OPT_mqdsp6_compat);
1284   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
1285   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
1286   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
1287   Opts.DebuggerCastResultToId = Args.hasArg(OPT_fdebugger_cast_result_to_id);
1288   Opts.DebuggerObjCLiteral = Args.hasArg(OPT_fdebugger_objc_literal);
1289   Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
1290   Opts.CurrentModule = Args.getLastArgValue(OPT_fmodule_name);
1291 
1292   // Check if -fopenmp is specified.
1293   Opts.OpenMP = Args.hasArg(OPT_fopenmp);
1294 
1295   // Record whether the __DEPRECATED define was requested.
1296   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,
1297                                  OPT_fno_deprecated_macro,
1298                                  Opts.Deprecated);
1299 
1300   // FIXME: Eliminate this dependency.
1301   unsigned Opt = getOptimizationLevel(Args, IK, Diags),
1302        OptSize = getOptimizationLevelSize(Args);
1303   Opts.Optimize = Opt != 0;
1304   Opts.OptimizeSize = OptSize != 0;
1305 
1306   // This is the __NO_INLINE__ define, which just depends on things like the
1307   // optimization level and -fno-inline, not actually whether the backend has
1308   // inlining enabled.
1309   Opts.NoInlineDefine = !Opt || Args.hasArg(OPT_fno_inline);
1310 
1311   Opts.FastMath = Args.hasArg(OPT_ffast_math);
1312   Opts.FiniteMathOnly = Args.hasArg(OPT_ffinite_math_only);
1313 
1314   Opts.RetainCommentsFromSystemHeaders =
1315       Args.hasArg(OPT_fretain_comments_from_system_headers);
1316 
1317   unsigned SSP = Args.getLastArgIntValue(OPT_stack_protector, 0, Diags);
1318   switch (SSP) {
1319   default:
1320     Diags.Report(diag::err_drv_invalid_value)
1321       << Args.getLastArg(OPT_stack_protector)->getAsString(Args) << SSP;
1322     break;
1323   case 0: Opts.setStackProtector(LangOptions::SSPOff); break;
1324   case 1: Opts.setStackProtector(LangOptions::SSPOn);  break;
1325   case 2: Opts.setStackProtector(LangOptions::SSPReq); break;
1326   }
1327 
1328   // Parse -fsanitize= arguments.
1329   std::vector<std::string> Sanitizers = Args.getAllArgValues(OPT_fsanitize_EQ);
1330   for (unsigned I = 0, N = Sanitizers.size(); I != N; ++I) {
1331     // Since the Opts.Sanitize* values are bitfields, it's a little tricky to
1332     // efficiently map string values to them. Perform the mapping indirectly:
1333     // convert strings to enumerated values, then switch over the enum to set
1334     // the right bitfield value.
1335     enum Sanitizer {
1336 #define SANITIZER(NAME, ID) \
1337       ID,
1338 #include "clang/Basic/Sanitizers.def"
1339       Unknown
1340     };
1341     switch (llvm::StringSwitch<unsigned>(Sanitizers[I])
1342 #define SANITIZER(NAME, ID) \
1343               .Case(NAME, ID)
1344 #include "clang/Basic/Sanitizers.def"
1345               .Default(Unknown)) {
1346 #define SANITIZER(NAME, ID) \
1347     case ID: \
1348       Opts.Sanitize.ID = true; \
1349       break;
1350 #include "clang/Basic/Sanitizers.def"
1351 
1352     case Unknown:
1353       Diags.Report(diag::err_drv_invalid_value)
1354         << "-fsanitize=" << Sanitizers[I];
1355       break;
1356     }
1357   }
1358 }
1359 
1360 static void ParsePreprocessorArgs(PreprocessorOptions &Opts, ArgList &Args,
1361                                   FileManager &FileMgr,
1362                                   DiagnosticsEngine &Diags) {
1363   using namespace options;
1364   Opts.ImplicitPCHInclude = Args.getLastArgValue(OPT_include_pch);
1365   Opts.ImplicitPTHInclude = Args.getLastArgValue(OPT_include_pth);
1366   if (const Arg *A = Args.getLastArg(OPT_token_cache))
1367       Opts.TokenCache = A->getValue();
1368   else
1369     Opts.TokenCache = Opts.ImplicitPTHInclude;
1370   Opts.UsePredefines = !Args.hasArg(OPT_undef);
1371   Opts.DetailedRecord = Args.hasArg(OPT_detailed_preprocessing_record);
1372   Opts.DisablePCHValidation = Args.hasArg(OPT_fno_validate_pch);
1373 
1374   Opts.DumpDeserializedPCHDecls = Args.hasArg(OPT_dump_deserialized_pch_decls);
1375   for (arg_iterator it = Args.filtered_begin(OPT_error_on_deserialized_pch_decl),
1376          ie = Args.filtered_end(); it != ie; ++it) {
1377     const Arg *A = *it;
1378     Opts.DeserializedPCHDeclsToErrorOn.insert(A->getValue());
1379   }
1380 
1381   if (const Arg *A = Args.getLastArg(OPT_preamble_bytes_EQ)) {
1382     StringRef Value(A->getValue());
1383     size_t Comma = Value.find(',');
1384     unsigned Bytes = 0;
1385     unsigned EndOfLine = 0;
1386 
1387     if (Comma == StringRef::npos ||
1388         Value.substr(0, Comma).getAsInteger(10, Bytes) ||
1389         Value.substr(Comma + 1).getAsInteger(10, EndOfLine))
1390       Diags.Report(diag::err_drv_preamble_format);
1391     else {
1392       Opts.PrecompiledPreambleBytes.first = Bytes;
1393       Opts.PrecompiledPreambleBytes.second = (EndOfLine != 0);
1394     }
1395   }
1396 
1397   // Add macros from the command line.
1398   for (arg_iterator it = Args.filtered_begin(OPT_D, OPT_U),
1399          ie = Args.filtered_end(); it != ie; ++it) {
1400     if ((*it)->getOption().matches(OPT_D))
1401       Opts.addMacroDef((*it)->getValue());
1402     else
1403       Opts.addMacroUndef((*it)->getValue());
1404   }
1405 
1406   Opts.MacroIncludes = Args.getAllArgValues(OPT_imacros);
1407 
1408   // Add the ordered list of -includes.
1409   for (arg_iterator it = Args.filtered_begin(OPT_include),
1410          ie = Args.filtered_end(); it != ie; ++it) {
1411     const Arg *A = *it;
1412     Opts.Includes.push_back(A->getValue());
1413   }
1414 
1415   for (arg_iterator it = Args.filtered_begin(OPT_chain_include),
1416          ie = Args.filtered_end(); it != ie; ++it) {
1417     const Arg *A = *it;
1418     Opts.ChainedIncludes.push_back(A->getValue());
1419   }
1420 
1421   // Include 'altivec.h' if -faltivec option present
1422   if (Args.hasArg(OPT_faltivec))
1423     Opts.Includes.push_back("altivec.h");
1424 
1425   for (arg_iterator it = Args.filtered_begin(OPT_remap_file),
1426          ie = Args.filtered_end(); it != ie; ++it) {
1427     const Arg *A = *it;
1428     std::pair<StringRef,StringRef> Split =
1429       StringRef(A->getValue()).split(';');
1430 
1431     if (Split.second.empty()) {
1432       Diags.Report(diag::err_drv_invalid_remap_file) << A->getAsString(Args);
1433       continue;
1434     }
1435 
1436     Opts.addRemappedFile(Split.first, Split.second);
1437   }
1438 
1439   if (Arg *A = Args.getLastArg(OPT_fobjc_arc_cxxlib_EQ)) {
1440     StringRef Name = A->getValue();
1441     unsigned Library = llvm::StringSwitch<unsigned>(Name)
1442       .Case("libc++", ARCXX_libcxx)
1443       .Case("libstdc++", ARCXX_libstdcxx)
1444       .Case("none", ARCXX_nolib)
1445       .Default(~0U);
1446     if (Library == ~0U)
1447       Diags.Report(diag::err_drv_invalid_value) << A->getAsString(Args) << Name;
1448     else
1449       Opts.ObjCXXARCStandardLibrary = (ObjCXXARCStandardLibraryKind)Library;
1450   }
1451 }
1452 
1453 static void ParsePreprocessorOutputArgs(PreprocessorOutputOptions &Opts,
1454                                         ArgList &Args,
1455                                         frontend::ActionKind Action) {
1456   using namespace options;
1457 
1458   switch (Action) {
1459   case frontend::ASTDeclList:
1460   case frontend::ASTDump:
1461   case frontend::ASTDumpXML:
1462   case frontend::ASTPrint:
1463   case frontend::ASTView:
1464   case frontend::EmitAssembly:
1465   case frontend::EmitBC:
1466   case frontend::EmitHTML:
1467   case frontend::EmitLLVM:
1468   case frontend::EmitLLVMOnly:
1469   case frontend::EmitCodeGenOnly:
1470   case frontend::EmitObj:
1471   case frontend::FixIt:
1472   case frontend::GenerateModule:
1473   case frontend::GeneratePCH:
1474   case frontend::GeneratePTH:
1475   case frontend::ParseSyntaxOnly:
1476   case frontend::ModuleFileInfo:
1477   case frontend::PluginAction:
1478   case frontend::PrintDeclContext:
1479   case frontend::RewriteObjC:
1480   case frontend::RewriteTest:
1481   case frontend::RunAnalysis:
1482   case frontend::MigrateSource:
1483     Opts.ShowCPP = 0;
1484     break;
1485 
1486   case frontend::DumpRawTokens:
1487   case frontend::DumpTokens:
1488   case frontend::InitOnly:
1489   case frontend::PrintPreamble:
1490   case frontend::PrintPreprocessedInput:
1491   case frontend::RewriteMacros:
1492   case frontend::RunPreprocessorOnly:
1493     Opts.ShowCPP = !Args.hasArg(OPT_dM);
1494     break;
1495   }
1496 
1497   Opts.ShowComments = Args.hasArg(OPT_C);
1498   Opts.ShowLineMarkers = !Args.hasArg(OPT_P);
1499   Opts.ShowMacroComments = Args.hasArg(OPT_CC);
1500   Opts.ShowMacros = Args.hasArg(OPT_dM) || Args.hasArg(OPT_dD);
1501   Opts.RewriteIncludes = Args.hasArg(OPT_frewrite_includes);
1502 }
1503 
1504 static void ParseTargetArgs(TargetOptions &Opts, ArgList &Args) {
1505   using namespace options;
1506   Opts.ABI = Args.getLastArgValue(OPT_target_abi);
1507   Opts.CXXABI = Args.getLastArgValue(OPT_cxx_abi);
1508   Opts.CPU = Args.getLastArgValue(OPT_target_cpu);
1509   Opts.FeaturesAsWritten = Args.getAllArgValues(OPT_target_feature);
1510   Opts.LinkerVersion = Args.getLastArgValue(OPT_target_linker_version);
1511   Opts.Triple = llvm::Triple::normalize(Args.getLastArgValue(OPT_triple));
1512 
1513   // Use the default target triple if unspecified.
1514   if (Opts.Triple.empty())
1515     Opts.Triple = llvm::sys::getDefaultTargetTriple();
1516 }
1517 
1518 //
1519 
1520 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
1521                                         const char *const *ArgBegin,
1522                                         const char *const *ArgEnd,
1523                                         DiagnosticsEngine &Diags) {
1524   bool Success = true;
1525 
1526   // Parse the arguments.
1527   OwningPtr<OptTable> Opts(createDriverOptTable());
1528   unsigned MissingArgIndex, MissingArgCount;
1529   OwningPtr<InputArgList> Args(
1530     Opts->ParseArgs(ArgBegin, ArgEnd,MissingArgIndex, MissingArgCount));
1531 
1532   // Check for missing argument error.
1533   if (MissingArgCount) {
1534     Diags.Report(diag::err_drv_missing_argument)
1535       << Args->getArgString(MissingArgIndex) << MissingArgCount;
1536     Success = false;
1537   }
1538 
1539   // Issue errors on unknown arguments.
1540   for (arg_iterator it = Args->filtered_begin(OPT_UNKNOWN),
1541          ie = Args->filtered_end(); it != ie; ++it) {
1542     Diags.Report(diag::err_drv_unknown_argument) << (*it)->getAsString(*Args);
1543     Success = false;
1544   }
1545 
1546   // Issue errors on arguments that are not valid for CC1.
1547   for (ArgList::iterator I = Args->begin(), E = Args->end();
1548        I != E; ++I) {
1549     if (!(*I)->getOption().hasFlag(options::CC1Option)) {
1550       Diags.Report(diag::err_drv_unknown_argument) << (*I)->getAsString(*Args);
1551       Success = false;
1552     }
1553   }
1554 
1555   Success = ParseAnalyzerArgs(*Res.getAnalyzerOpts(), *Args, Diags) && Success;
1556   Success = ParseMigratorArgs(Res.getMigratorOpts(), *Args) && Success;
1557   ParseDependencyOutputArgs(Res.getDependencyOutputOpts(), *Args);
1558   Success = ParseDiagnosticArgs(Res.getDiagnosticOpts(), *Args, &Diags)
1559             && Success;
1560   ParseCommentArgs(Res.getLangOpts()->CommentOpts, *Args);
1561   ParseFileSystemArgs(Res.getFileSystemOpts(), *Args);
1562   // FIXME: We shouldn't have to pass the DashX option around here
1563   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), *Args, Diags);
1564   Success = ParseCodeGenArgs(Res.getCodeGenOpts(), *Args, DashX, Diags)
1565             && Success;
1566   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), *Args);
1567   if (DashX != IK_AST && DashX != IK_LLVM_IR) {
1568     ParseLangArgs(*Res.getLangOpts(), *Args, DashX, Diags);
1569     if (Res.getFrontendOpts().ProgramAction == frontend::RewriteObjC)
1570       Res.getLangOpts()->ObjCExceptions = 1;
1571   }
1572   // FIXME: ParsePreprocessorArgs uses the FileManager to read the contents of
1573   // PCH file and find the original header name. Remove the need to do that in
1574   // ParsePreprocessorArgs and remove the FileManager
1575   // parameters from the function and the "FileManager.h" #include.
1576   FileManager FileMgr(Res.getFileSystemOpts());
1577   ParsePreprocessorArgs(Res.getPreprocessorOpts(), *Args, FileMgr, Diags);
1578   ParsePreprocessorOutputArgs(Res.getPreprocessorOutputOpts(), *Args,
1579                               Res.getFrontendOpts().ProgramAction);
1580   ParseTargetArgs(Res.getTargetOpts(), *Args);
1581 
1582   return Success;
1583 }
1584 
1585 namespace {
1586 
1587   class ModuleSignature {
1588     SmallVector<uint64_t, 16> Data;
1589     unsigned CurBit;
1590     uint64_t CurValue;
1591 
1592   public:
1593     ModuleSignature() : CurBit(0), CurValue(0) { }
1594 
1595     void add(uint64_t Value, unsigned Bits);
1596     void add(StringRef Value);
1597     void flush();
1598 
1599     llvm::APInt getAsInteger() const;
1600   };
1601 }
1602 
1603 void ModuleSignature::add(uint64_t Value, unsigned int NumBits) {
1604   CurValue |= Value << CurBit;
1605   if (CurBit + NumBits < 64) {
1606     CurBit += NumBits;
1607     return;
1608   }
1609 
1610   // Add the current word.
1611   Data.push_back(CurValue);
1612 
1613   if (CurBit)
1614     CurValue = Value >> (64-CurBit);
1615   else
1616     CurValue = 0;
1617   CurBit = (CurBit+NumBits) & 63;
1618 }
1619 
1620 void ModuleSignature::flush() {
1621   if (CurBit == 0)
1622     return;
1623 
1624   Data.push_back(CurValue);
1625   CurBit = 0;
1626   CurValue = 0;
1627 }
1628 
1629 void ModuleSignature::add(StringRef Value) {
1630   for (StringRef::iterator I = Value.begin(), IEnd = Value.end(); I != IEnd;++I)
1631     add(*I, 8);
1632 }
1633 
1634 llvm::APInt ModuleSignature::getAsInteger() const {
1635   return llvm::APInt(Data.size() * 64, Data);
1636 }
1637 
1638 std::string CompilerInvocation::getModuleHash() const {
1639   // Note: For QoI reasons, the things we use as a hash here should all be
1640   // dumped via the -module-info flag.
1641   using llvm::hash_code;
1642   using llvm::hash_value;
1643   using llvm::hash_combine;
1644 
1645   // Start the signature with the compiler version.
1646   // FIXME: We'd rather use something more cryptographically sound than
1647   // CityHash, but this will do for now.
1648   hash_code code = hash_value(getClangFullRepositoryVersion());
1649 
1650   // Extend the signature with the language options
1651 #define LANGOPT(Name, Bits, Default, Description) \
1652    code = hash_combine(code, LangOpts->Name);
1653 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1654   code = hash_combine(code, static_cast<unsigned>(LangOpts->get##Name()));
1655 #define BENIGN_LANGOPT(Name, Bits, Default, Description)
1656 #define BENIGN_ENUM_LANGOPT(Name, Type, Bits, Default, Description)
1657 #include "clang/Basic/LangOptions.def"
1658 
1659   // Extend the signature with the target options.
1660   code = hash_combine(code, TargetOpts->Triple, TargetOpts->CPU,
1661                       TargetOpts->ABI, TargetOpts->CXXABI,
1662                       TargetOpts->LinkerVersion);
1663   for (unsigned i = 0, n = TargetOpts->FeaturesAsWritten.size(); i != n; ++i)
1664     code = hash_combine(code, TargetOpts->FeaturesAsWritten[i]);
1665 
1666   // Extend the signature with preprocessor options.
1667   const PreprocessorOptions &ppOpts = getPreprocessorOpts();
1668   const HeaderSearchOptions &hsOpts = getHeaderSearchOpts();
1669   code = hash_combine(code, ppOpts.UsePredefines, ppOpts.DetailedRecord);
1670 
1671   std::vector<StringRef> MacroDefs;
1672   for (std::vector<std::pair<std::string, bool/*isUndef*/> >::const_iterator
1673             I = getPreprocessorOpts().Macros.begin(),
1674          IEnd = getPreprocessorOpts().Macros.end();
1675        I != IEnd; ++I) {
1676     // If we're supposed to ignore this macro for the purposes of modules,
1677     // don't put it into the hash.
1678     if (!hsOpts.ModulesIgnoreMacros.empty()) {
1679       // Check whether we're ignoring this macro.
1680       StringRef MacroDef = I->first;
1681       if (hsOpts.ModulesIgnoreMacros.count(MacroDef.split('=').first))
1682         continue;
1683     }
1684 
1685     code = hash_combine(code, I->first, I->second);
1686   }
1687 
1688   // Extend the signature with the sysroot.
1689   code = hash_combine(code, hsOpts.Sysroot, hsOpts.UseBuiltinIncludes,
1690                       hsOpts.UseStandardSystemIncludes,
1691                       hsOpts.UseStandardCXXIncludes,
1692                       hsOpts.UseLibcxx);
1693 
1694   // Darwin-specific hack: if we have a sysroot, use the contents and
1695   // modification time of
1696   //   $sysroot/System/Library/CoreServices/SystemVersion.plist
1697   // as part of the module hash.
1698   if (!hsOpts.Sysroot.empty()) {
1699     llvm::OwningPtr<llvm::MemoryBuffer> buffer;
1700     SmallString<128> systemVersionFile;
1701     systemVersionFile += hsOpts.Sysroot;
1702     llvm::sys::path::append(systemVersionFile, "System");
1703     llvm::sys::path::append(systemVersionFile, "Library");
1704     llvm::sys::path::append(systemVersionFile, "CoreServices");
1705     llvm::sys::path::append(systemVersionFile, "SystemVersion.plist");
1706     if (!llvm::MemoryBuffer::getFile(systemVersionFile, buffer)) {
1707       code = hash_combine(code, buffer.get()->getBuffer());
1708 
1709       struct stat statBuf;
1710       if (stat(systemVersionFile.c_str(), &statBuf) == 0)
1711         code = hash_combine(code, statBuf.st_mtime);
1712     }
1713   }
1714 
1715   return llvm::APInt(64, code).toString(36, /*Signed=*/false);
1716 }
1717