xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 2e9439e4891c3d427c0fed477b54f3da2ff8ec28) 
1 //===- CompilerInvocation.cpp ---------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "flang/Frontend/CompilerInvocation.h"
10 #include "flang/Common/Fortran-features.h"
11 #include "flang/Frontend/PreprocessorOptions.h"
12 #include "flang/Frontend/TargetOptions.h"
13 #include "flang/Semantics/semantics.h"
14 #include "flang/Version.inc"
15 #include "clang/Basic/AllDiagnostics.h"
16 #include "clang/Basic/DiagnosticDriver.h"
17 #include "clang/Basic/DiagnosticOptions.h"
18 #include "clang/Driver/DriverDiagnostic.h"
19 #include "clang/Driver/Options.h"
20 #include "llvm/ADT/StringRef.h"
21 #include "llvm/ADT/StringSwitch.h"
22 #include "llvm/Option/Arg.h"
23 #include "llvm/Option/ArgList.h"
24 #include "llvm/Option/OptTable.h"
25 #include "llvm/Support/FileSystem.h"
26 #include "llvm/Support/FileUtilities.h"
27 #include "llvm/Support/Path.h"
28 #include "llvm/Support/Process.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include <memory>
31 
32 using namespace Fortran::frontend;
33 
34 //===----------------------------------------------------------------------===//
35 // Initialization.
36 //===----------------------------------------------------------------------===//
37 CompilerInvocationBase::CompilerInvocationBase()
38     : diagnosticOpts_(new clang::DiagnosticOptions()),
39       preprocessorOpts_(new PreprocessorOptions()) {}
40 
41 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &x)
42     : diagnosticOpts_(new clang::DiagnosticOptions(x.GetDiagnosticOpts())),
43       preprocessorOpts_(new PreprocessorOptions(x.preprocessorOpts())) {}
44 
45 CompilerInvocationBase::~CompilerInvocationBase() = default;
46 
47 //===----------------------------------------------------------------------===//
48 // Deserialization (from args)
49 //===----------------------------------------------------------------------===//
50 static bool parseShowColorsArgs(
51     const llvm::opt::ArgList &args, bool defaultColor) {
52   // Color diagnostics default to auto ("on" if terminal supports) in the driver
53   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
54   // Support both clang's -f[no-]color-diagnostics and gcc's
55   // -f[no-]diagnostics-colors[=never|always|auto].
56   enum {
57     Colors_On,
58     Colors_Off,
59     Colors_Auto
60   } ShowColors = defaultColor ? Colors_Auto : Colors_Off;
61 
62   for (auto *a : args) {
63     const llvm::opt::Option &O = a->getOption();
64     if (O.matches(clang::driver::options::OPT_fcolor_diagnostics) ||
65         O.matches(clang::driver::options::OPT_fdiagnostics_color)) {
66       ShowColors = Colors_On;
67     } else if (O.matches(clang::driver::options::OPT_fno_color_diagnostics) ||
68         O.matches(clang::driver::options::OPT_fno_diagnostics_color)) {
69       ShowColors = Colors_Off;
70     } else if (O.matches(clang::driver::options::OPT_fdiagnostics_color_EQ)) {
71       llvm::StringRef value(a->getValue());
72       if (value == "always")
73         ShowColors = Colors_On;
74       else if (value == "never")
75         ShowColors = Colors_Off;
76       else if (value == "auto")
77         ShowColors = Colors_Auto;
78     }
79   }
80 
81   return ShowColors == Colors_On ||
82       (ShowColors == Colors_Auto && llvm::sys::Process::StandardErrHasColors());
83 }
84 
85 bool Fortran::frontend::ParseDiagnosticArgs(clang::DiagnosticOptions &opts,
86     llvm::opt::ArgList &args, bool defaultDiagColor) {
87   opts.ShowColors = parseShowColorsArgs(args, defaultDiagColor);
88 
89   return true;
90 }
91 
92 /// Parses all target input arguments and populates the target
93 /// options accordingly.
94 ///
95 /// \param [in] opts The target options instance to update
96 /// \param [in] args The list of input arguments (from the compiler invocation)
97 static void ParseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
98   opts.triple = args.getLastArgValue(clang::driver::options::OPT_triple);
99 }
100 
101 // Tweak the frontend configuration based on the frontend action
102 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
103   assert(opts.programAction != Fortran::frontend::InvalidAction &&
104       "Fortran frontend action not set!");
105 
106   if (opts.programAction == DebugDumpParsingLog)
107     opts.instrumentedParse = true;
108 
109   if (opts.programAction == DebugDumpProvenance ||
110       opts.programAction == Fortran::frontend::GetDefinition)
111     opts.needProvenanceRangeToCharBlockMappings = true;
112 }
113 
114 static bool ParseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
115     clang::DiagnosticsEngine &diags) {
116   unsigned numErrorsBefore = diags.getNumErrors();
117 
118   // By default the frontend driver creates a ParseSyntaxOnly action.
119   opts.programAction = ParseSyntaxOnly;
120 
121   // Treat multiple action options as an invocation error. Note that `clang
122   // -cc1` does accept multiple action options, but will only consider the
123   // rightmost one.
124   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
125     const unsigned diagID = diags.getCustomDiagID(
126         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
127     diags.Report(diagID);
128     return false;
129   }
130 
131   // Identify the action (i.e. opts.ProgramAction)
132   if (const llvm::opt::Arg *a =
133           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
134     switch (a->getOption().getID()) {
135     default: {
136       llvm_unreachable("Invalid option in group!");
137     }
138     case clang::driver::options::OPT_test_io:
139       opts.programAction = InputOutputTest;
140       break;
141     case clang::driver::options::OPT_E:
142       opts.programAction = PrintPreprocessedInput;
143       break;
144     case clang::driver::options::OPT_fsyntax_only:
145       opts.programAction = ParseSyntaxOnly;
146       break;
147     case clang::driver::options::OPT_emit_mlir:
148       opts.programAction = EmitMLIR;
149       break;
150     case clang::driver::options::OPT_emit_llvm:
151       opts.programAction = EmitLLVM;
152       break;
153     case clang::driver::options::OPT_emit_obj:
154       opts.programAction = EmitObj;
155       break;
156     case clang::driver::options::OPT_fdebug_unparse:
157       opts.programAction = DebugUnparse;
158       break;
159     case clang::driver::options::OPT_fdebug_unparse_no_sema:
160       opts.programAction = DebugUnparseNoSema;
161       break;
162     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
163       opts.programAction = DebugUnparseWithSymbols;
164       break;
165     case clang::driver::options::OPT_fdebug_dump_symbols:
166       opts.programAction = DebugDumpSymbols;
167       break;
168     case clang::driver::options::OPT_fdebug_dump_parse_tree:
169       opts.programAction = DebugDumpParseTree;
170       break;
171     case clang::driver::options::OPT_fdebug_dump_all:
172       opts.programAction = DebugDumpAll;
173       break;
174     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
175       opts.programAction = DebugDumpParseTreeNoSema;
176       break;
177     case clang::driver::options::OPT_fdebug_dump_provenance:
178       opts.programAction = DebugDumpProvenance;
179       break;
180     case clang::driver::options::OPT_fdebug_dump_parsing_log:
181       opts.programAction = DebugDumpParsingLog;
182       break;
183     case clang::driver::options::OPT_fdebug_measure_parse_tree:
184       opts.programAction = DebugMeasureParseTree;
185       break;
186     case clang::driver::options::OPT_fdebug_pre_fir_tree:
187       opts.programAction = DebugPreFIRTree;
188       break;
189     case clang::driver::options::OPT_fget_symbols_sources:
190       opts.programAction = GetSymbolsSources;
191       break;
192     case clang::driver::options::OPT_fget_definition:
193       opts.programAction = GetDefinition;
194       break;
195     case clang::driver::options::OPT_init_only:
196       opts.programAction = InitOnly;
197       break;
198 
199       // TODO:
200       // case clang::driver::options::OPT_emit_llvm:
201       // case clang::driver::options::OPT_emit_llvm_only:
202       // case clang::driver::options::OPT_emit_codegen_only:
203       // case clang::driver::options::OPT_emit_module:
204       // (...)
205     }
206 
207     // Parse the values provided with `-fget-definition` (there should be 3
208     // integers)
209     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
210         clang::driver::options::OPT_fget_definition) {
211       unsigned optVals[3] = {0, 0, 0};
212 
213       for (unsigned i = 0; i < 3; i++) {
214         llvm::StringRef val = a->getValue(i);
215 
216         if (val.getAsInteger(10, optVals[i])) {
217           // A non-integer was encountered - that's an error.
218           diags.Report(clang::diag::err_drv_invalid_value)
219               << a->getOption().getName() << val;
220           break;
221         }
222       }
223       opts.getDefVals.line = optVals[0];
224       opts.getDefVals.startColumn = optVals[1];
225       opts.getDefVals.endColumn = optVals[2];
226     }
227   }
228 
229   // Parsing -load <dsopath> option and storing shared object path
230   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
231     opts.plugins.push_back(a->getValue());
232   }
233 
234   // Parsing -plugin <name> option and storing plugin name and setting action
235   if (const llvm::opt::Arg *a =
236           args.getLastArg(clang::driver::options::OPT_plugin)) {
237     opts.programAction = PluginAction;
238     opts.ActionName = a->getValue();
239   }
240 
241   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
242   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
243   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
244 
245   // Get the input kind (from the value passed via `-x`)
246   InputKind dashX(Language::Unknown);
247   if (const llvm::opt::Arg *a =
248           args.getLastArg(clang::driver::options::OPT_x)) {
249     llvm::StringRef XValue = a->getValue();
250     // Principal languages.
251     dashX = llvm::StringSwitch<InputKind>(XValue)
252                 .Case("f90", Language::Fortran)
253                 .Default(Language::Unknown);
254 
255     // Some special cases cannot be combined with suffixes.
256     if (dashX.IsUnknown())
257       dashX = llvm::StringSwitch<InputKind>(XValue)
258                   .Case("ir", Language::LLVM_IR)
259                   .Default(Language::Unknown);
260 
261     if (dashX.IsUnknown())
262       diags.Report(clang::diag::err_drv_invalid_value)
263           << a->getAsString(args) << a->getValue();
264   }
265 
266   // Collect the input files and save them in our instance of FrontendOptions.
267   std::vector<std::string> inputs =
268       args.getAllArgValues(clang::driver::options::OPT_INPUT);
269   opts.inputs.clear();
270   if (inputs.empty())
271     // '-' is the default input if none is given.
272     inputs.push_back("-");
273   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
274     InputKind ik = dashX;
275     if (ik.IsUnknown()) {
276       ik = FrontendOptions::GetInputKindForExtension(
277           llvm::StringRef(inputs[i]).rsplit('.').second);
278       if (ik.IsUnknown())
279         ik = Language::Unknown;
280       if (i == 0)
281         dashX = ik;
282     }
283 
284     opts.inputs.emplace_back(std::move(inputs[i]), ik);
285   }
286 
287   // Set fortranForm based on options -ffree-form and -ffixed-form.
288   if (const auto *arg = args.getLastArg(clang::driver::options::OPT_ffixed_form,
289           clang::driver::options::OPT_ffree_form)) {
290     opts.fortranForm =
291         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
292         ? FortranForm::FixedForm
293         : FortranForm::FreeForm;
294   }
295 
296   // Set fixedFormColumns based on -ffixed-line-length=<value>
297   if (const auto *arg =
298           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
299     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
300     std::int64_t columns = -1;
301     if (argValue == "none") {
302       columns = 0;
303     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
304       columns = -1;
305     }
306     if (columns < 0) {
307       diags.Report(clang::diag::err_drv_negative_columns)
308           << arg->getOption().getName() << arg->getValue();
309     } else if (columns == 0) {
310       opts.fixedFormColumns = 1000000;
311     } else if (columns < 7) {
312       diags.Report(clang::diag::err_drv_small_columns)
313           << arg->getOption().getName() << arg->getValue() << "7";
314     } else {
315       opts.fixedFormColumns = columns;
316     }
317   }
318 
319   // -f{no-}implicit-none
320   opts.features.Enable(
321       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
322       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
323           clang::driver::options::OPT_fno_implicit_none, false));
324 
325   // -f{no-}backslash
326   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
327       args.hasFlag(clang::driver::options::OPT_fbackslash,
328           clang::driver::options::OPT_fno_backslash, false));
329 
330   // -f{no-}logical-abbreviations
331   opts.features.Enable(Fortran::common::LanguageFeature::LogicalAbbreviations,
332       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
333           clang::driver::options::OPT_fno_logical_abbreviations, false));
334 
335   // -f{no-}xor-operator
336   opts.features.Enable(Fortran::common::LanguageFeature::XOROperator,
337       args.hasFlag(clang::driver::options::OPT_fxor_operator,
338           clang::driver::options::OPT_fno_xor_operator, false));
339 
340   // -fno-automatic
341   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
342     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
343   }
344 
345   if (args.hasArg(
346           clang::driver::options::OPT_falternative_parameter_statement)) {
347     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
348   }
349   if (const llvm::opt::Arg *arg =
350           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
351     llvm::StringRef argValue = arg->getValue();
352     if (argValue == "utf-8") {
353       opts.encoding = Fortran::parser::Encoding::UTF_8;
354     } else if (argValue == "latin-1") {
355       opts.encoding = Fortran::parser::Encoding::LATIN_1;
356     } else {
357       diags.Report(clang::diag::err_drv_invalid_value)
358           << arg->getAsString(args) << argValue;
359     }
360   }
361 
362   setUpFrontendBasedOnAction(opts);
363   opts.dashX = dashX;
364 
365   return diags.getNumErrors() == numErrorsBefore;
366 }
367 
368 // Generate the path to look for intrinsic modules
369 static std::string getIntrinsicDir() {
370   // TODO: Find a system independent API
371   llvm::SmallString<128> driverPath;
372   driverPath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
373   llvm::sys::path::remove_filename(driverPath);
374   driverPath.append("/../include/flang/");
375   return std::string(driverPath);
376 }
377 
378 /// Parses all preprocessor input arguments and populates the preprocessor
379 /// options accordingly.
380 ///
381 /// \param [in] opts The preprocessor options instance
382 /// \param [out] args The list of input arguments
383 static void parsePreprocessorArgs(
384     Fortran::frontend::PreprocessorOptions &opts, llvm::opt::ArgList &args) {
385   // Add macros from the command line.
386   for (const auto *currentArg : args.filtered(
387            clang::driver::options::OPT_D, clang::driver::options::OPT_U)) {
388     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
389       opts.addMacroDef(currentArg->getValue());
390     } else {
391       opts.addMacroUndef(currentArg->getValue());
392     }
393   }
394 
395   // Add the ordered list of -I's.
396   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
397     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
398 
399   // Prepend the ordered list of -intrinsic-modules-path
400   // to the default location to search.
401   for (const auto *currentArg :
402       args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
403     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
404 
405   // -cpp/-nocpp
406   if (const auto *currentArg = args.getLastArg(
407           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
408     opts.macrosFlag =
409         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
410         ? PPMacrosFlag::Include
411         : PPMacrosFlag::Exclude;
412 
413   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
414   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
415 }
416 
417 /// Parses all semantic related arguments and populates the variables
418 /// options accordingly. Returns false if new errors are generated.
419 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
420     clang::DiagnosticsEngine &diags) {
421   unsigned numErrorsBefore = diags.getNumErrors();
422 
423   // -J/module-dir option
424   auto moduleDirList =
425       args.getAllArgValues(clang::driver::options::OPT_module_dir);
426   // User can only specify -J/-module-dir once
427   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
428   if (moduleDirList.size() > 1) {
429     const unsigned diagID =
430         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
431             "Only one '-module-dir/-J' option allowed");
432     diags.Report(diagID);
433   }
434   if (moduleDirList.size() == 1)
435     res.SetModuleDir(moduleDirList[0]);
436 
437   // -fdebug-module-writer option
438   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
439     res.SetDebugModuleDir(true);
440   }
441 
442   // -module-suffix
443   if (const auto *moduleSuffix =
444           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
445     res.SetModuleFileSuffix(moduleSuffix->getValue());
446   }
447 
448   // -f{no-}analyzed-objects-for-unparse
449   res.SetUseAnalyzedObjectsForUnparse(
450       args.hasFlag(clang::driver::options::OPT_fanalyzed_objects_for_unparse,
451           clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
452 
453   return diags.getNumErrors() == numErrorsBefore;
454 }
455 
456 /// Parses all diagnostics related arguments and populates the variables
457 /// options accordingly. Returns false if new errors are generated.
458 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
459     clang::DiagnosticsEngine &diags) {
460   unsigned numErrorsBefore = diags.getNumErrors();
461 
462   // -Werror option
463   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
464   // this has to change when other -W<opt>'s are supported.
465   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
466     if (args.getLastArgValue(clang::driver::options::OPT_W_Joined)
467             .equals("error")) {
468       res.SetWarnAsErr(true);
469     } else {
470       const unsigned diagID =
471           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
472               "Only `-Werror` is supported currently.");
473       diags.Report(diagID);
474     }
475   }
476 
477   return diags.getNumErrors() == numErrorsBefore;
478 }
479 
480 /// Parses all Dialect related arguments and populates the variables
481 /// options accordingly. Returns false if new errors are generated.
482 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
483     clang::DiagnosticsEngine &diags) {
484   unsigned numErrorsBefore = diags.getNumErrors();
485 
486   // -fdefault* family
487   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
488     res.defaultKinds().set_defaultRealKind(8);
489     res.defaultKinds().set_doublePrecisionKind(16);
490   }
491   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
492     res.defaultKinds().set_defaultIntegerKind(8);
493     res.defaultKinds().set_subscriptIntegerKind(8);
494     res.defaultKinds().set_sizeIntegerKind(8);
495   }
496   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
497     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
498       // -fdefault-double-8 has to be used with -fdefault-real-8
499       // to be compatible with gfortran
500       const unsigned diagID =
501           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
502               "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
503       diags.Report(diagID);
504     }
505     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
506     res.defaultKinds().set_doublePrecisionKind(8);
507   }
508   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
509     res.defaultKinds().set_sizeIntegerKind(8);
510 
511   // -fopenmp and -fopenacc
512   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
513     res.frontendOpts().features.Enable(
514         Fortran::common::LanguageFeature::OpenACC);
515   }
516   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
517     res.frontendOpts().features.Enable(
518         Fortran::common::LanguageFeature::OpenMP);
519   }
520 
521   // -pedantic
522   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
523     res.set_EnableConformanceChecks();
524   }
525   // -std=f2018 (currently this implies -pedantic)
526   // TODO: Set proper options when more fortran standards
527   // are supported.
528   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
529     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
530     // We only allow f2018 as the given standard
531     if (standard.equals("f2018")) {
532       res.set_EnableConformanceChecks();
533     } else {
534       const unsigned diagID =
535           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
536               "Only -std=f2018 is allowed currently.");
537       diags.Report(diagID);
538     }
539   }
540   return diags.getNumErrors() == numErrorsBefore;
541 }
542 
543 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &res,
544     llvm::ArrayRef<const char *> commandLineArgs,
545     clang::DiagnosticsEngine &diags) {
546 
547   bool success = true;
548 
549   // Parse the arguments
550   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
551   const unsigned includedFlagsBitmask = clang::driver::options::FC1Option;
552   unsigned missingArgIndex, missingArgCount;
553   llvm::opt::InputArgList args = opts.ParseArgs(
554       commandLineArgs, missingArgIndex, missingArgCount, includedFlagsBitmask);
555 
556   // Check for missing argument error.
557   if (missingArgCount) {
558     diags.Report(clang::diag::err_drv_missing_argument)
559         << args.getArgString(missingArgIndex) << missingArgCount;
560     success = false;
561   }
562 
563   // Issue errors on unknown arguments
564   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
565     auto argString = a->getAsString(args);
566     std::string nearest;
567     if (opts.findNearest(argString, nearest, includedFlagsBitmask) > 1)
568       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
569     else
570       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
571           << argString << nearest;
572     success = false;
573   }
574 
575   success &= ParseFrontendArgs(res.frontendOpts(), args, diags);
576   ParseTargetArgs(res.targetOpts(), args);
577   parsePreprocessorArgs(res.preprocessorOpts(), args);
578   success &= parseSemaArgs(res, args, diags);
579   success &= parseDialectArgs(res, args, diags);
580   success &= parseDiagArgs(res, args, diags);
581 
582   return success;
583 }
584 
585 void CompilerInvocation::CollectMacroDefinitions() {
586   auto &ppOpts = this->preprocessorOpts();
587 
588   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
589     llvm::StringRef macro = ppOpts.macros[i].first;
590     bool isUndef = ppOpts.macros[i].second;
591 
592     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
593     llvm::StringRef macroName = macroPair.first;
594     llvm::StringRef macroBody = macroPair.second;
595 
596     // For an #undef'd macro, we only care about the name.
597     if (isUndef) {
598       parserOpts_.predefinitions.emplace_back(
599           macroName.str(), std::optional<std::string>{});
600       continue;
601     }
602 
603     // For a #define'd macro, figure out the actual definition.
604     if (macroName.size() == macro.size())
605       macroBody = "1";
606     else {
607       // Note: GCC drops anything following an end-of-line character.
608       llvm::StringRef::size_type End = macroBody.find_first_of("\n\r");
609       macroBody = macroBody.substr(0, End);
610     }
611     parserOpts_.predefinitions.emplace_back(
612         macroName, std::optional<std::string>(macroBody.str()));
613   }
614 }
615 
616 void CompilerInvocation::SetDefaultFortranOpts() {
617   auto &fortranOptions = fortranOpts();
618 
619   std::vector<std::string> searchDirectories{"."s};
620   fortranOptions.searchDirectories = searchDirectories;
621   fortranOptions.isFixedForm = false;
622 }
623 
624 // TODO: When expanding this method, consider creating a dedicated API for
625 // this. Also at some point we will need to differentiate between different
626 // targets and add dedicated predefines for each.
627 void CompilerInvocation::SetDefaultPredefinitions() {
628   auto &fortranOptions = fortranOpts();
629   const auto &frontendOptions = frontendOpts();
630 
631   // Populate the macro list with version numbers and other predefinitions.
632   fortranOptions.predefinitions.emplace_back("__flang__", "1");
633   fortranOptions.predefinitions.emplace_back(
634       "__flang_major__", FLANG_VERSION_MAJOR_STRING);
635   fortranOptions.predefinitions.emplace_back(
636       "__flang_minor__", FLANG_VERSION_MINOR_STRING);
637   fortranOptions.predefinitions.emplace_back(
638       "__flang_patchlevel__", FLANG_VERSION_PATCHLEVEL_STRING);
639 
640   // Add predefinitions based on extensions enabled
641   if (frontendOptions.features.IsEnabled(
642           Fortran::common::LanguageFeature::OpenACC)) {
643     fortranOptions.predefinitions.emplace_back("_OPENACC", "202011");
644   }
645   if (frontendOptions.features.IsEnabled(
646           Fortran::common::LanguageFeature::OpenMP)) {
647     fortranOptions.predefinitions.emplace_back("_OPENMP", "201511");
648   }
649 }
650 
651 void CompilerInvocation::SetFortranOpts() {
652   auto &fortranOptions = fortranOpts();
653   const auto &frontendOptions = frontendOpts();
654   const auto &preprocessorOptions = preprocessorOpts();
655   auto &moduleDirJ = moduleDir();
656 
657   if (frontendOptions.fortranForm != FortranForm::Unknown) {
658     fortranOptions.isFixedForm =
659         frontendOptions.fortranForm == FortranForm::FixedForm;
660   }
661   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
662 
663   fortranOptions.features = frontendOptions.features;
664   fortranOptions.encoding = frontendOptions.encoding;
665 
666   // Adding search directories specified by -I
667   fortranOptions.searchDirectories.insert(
668       fortranOptions.searchDirectories.end(),
669       preprocessorOptions.searchDirectoriesFromDashI.begin(),
670       preprocessorOptions.searchDirectoriesFromDashI.end());
671 
672   // Add the ordered list of -intrinsic-modules-path
673   fortranOptions.searchDirectories.insert(
674       fortranOptions.searchDirectories.end(),
675       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
676       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
677 
678   //  Add the default intrinsic module directory
679   fortranOptions.intrinsicModuleDirectories.emplace_back(getIntrinsicDir());
680 
681   // Add the directory supplied through -J/-module-dir to the list of search
682   // directories
683   if (moduleDirJ.compare(".") != 0)
684     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
685 
686   if (frontendOptions.instrumentedParse)
687     fortranOptions.instrumentedParse = true;
688 
689   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
690     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
691 
692   if (enableConformanceChecks()) {
693     fortranOptions.features.WarnOnAllNonstandard();
694   }
695 }
696 
697 void CompilerInvocation::SetSemanticsOpts(
698     Fortran::parser::AllCookedSources &allCookedSources) {
699   const auto &fortranOptions = fortranOpts();
700 
701   semanticsContext_ = std::make_unique<semantics::SemanticsContext>(
702       defaultKinds(), fortranOptions.features, allCookedSources);
703 
704   semanticsContext_->set_moduleDirectory(moduleDir())
705       .set_searchDirectories(fortranOptions.searchDirectories)
706       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
707       .set_warnOnNonstandardUsage(enableConformanceChecks())
708       .set_warningsAreErrors(warnAsErr())
709       .set_moduleFileSuffix(moduleFileSuffix());
710 }
711