xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision f52fc591fa34a8c85577108358b3b36c42b6d364) 
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/Semantics/semantics.h"
13 #include "flang/Version.inc"
14 #include "clang/Basic/AllDiagnostics.h"
15 #include "clang/Basic/DiagnosticDriver.h"
16 #include "clang/Basic/DiagnosticOptions.h"
17 #include "clang/Driver/DriverDiagnostic.h"
18 #include "clang/Driver/Options.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/ADT/StringSwitch.h"
21 #include "llvm/Option/Arg.h"
22 #include "llvm/Option/ArgList.h"
23 #include "llvm/Option/OptTable.h"
24 #include "llvm/Support/FileSystem.h"
25 #include "llvm/Support/FileUtilities.h"
26 #include "llvm/Support/Process.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include <memory>
29 
30 using namespace Fortran::frontend;
31 
32 //===----------------------------------------------------------------------===//
33 // Initialization.
34 //===----------------------------------------------------------------------===//
35 CompilerInvocationBase::CompilerInvocationBase()
36     : diagnosticOpts_(new clang::DiagnosticOptions()),
37       preprocessorOpts_(new PreprocessorOptions()) {}
38 
39 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &x)
40     : diagnosticOpts_(new clang::DiagnosticOptions(x.GetDiagnosticOpts())),
41       preprocessorOpts_(new PreprocessorOptions(x.preprocessorOpts())) {}
42 
43 CompilerInvocationBase::~CompilerInvocationBase() = default;
44 
45 //===----------------------------------------------------------------------===//
46 // Deserialization (from args)
47 //===----------------------------------------------------------------------===//
48 static bool parseShowColorsArgs(
49     const llvm::opt::ArgList &args, bool defaultColor) {
50   // Color diagnostics default to auto ("on" if terminal supports) in the driver
51   // but default to off in cc1, needing an explicit OPT_fdiagnostics_color.
52   // Support both clang's -f[no-]color-diagnostics and gcc's
53   // -f[no-]diagnostics-colors[=never|always|auto].
54   enum {
55     Colors_On,
56     Colors_Off,
57     Colors_Auto
58   } ShowColors = defaultColor ? Colors_Auto : Colors_Off;
59 
60   for (auto *a : args) {
61     const llvm::opt::Option &O = a->getOption();
62     if (O.matches(clang::driver::options::OPT_fcolor_diagnostics) ||
63         O.matches(clang::driver::options::OPT_fdiagnostics_color)) {
64       ShowColors = Colors_On;
65     } else if (O.matches(clang::driver::options::OPT_fno_color_diagnostics) ||
66         O.matches(clang::driver::options::OPT_fno_diagnostics_color)) {
67       ShowColors = Colors_Off;
68     } else if (O.matches(clang::driver::options::OPT_fdiagnostics_color_EQ)) {
69       llvm::StringRef value(a->getValue());
70       if (value == "always")
71         ShowColors = Colors_On;
72       else if (value == "never")
73         ShowColors = Colors_Off;
74       else if (value == "auto")
75         ShowColors = Colors_Auto;
76     }
77   }
78 
79   return ShowColors == Colors_On ||
80       (ShowColors == Colors_Auto && llvm::sys::Process::StandardErrHasColors());
81 }
82 
83 bool Fortran::frontend::ParseDiagnosticArgs(clang::DiagnosticOptions &opts,
84     llvm::opt::ArgList &args, bool defaultDiagColor) {
85   opts.ShowColors = parseShowColorsArgs(args, defaultDiagColor);
86 
87   return true;
88 }
89 
90 // Tweak the frontend configuration based on the frontend action
91 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
92   assert(opts.programAction != Fortran::frontend::InvalidAction &&
93       "Fortran frontend action not set!");
94 
95   if (opts.programAction == DebugDumpParsingLog)
96     opts.instrumentedParse = true;
97 
98   if (opts.programAction == DebugDumpProvenance ||
99       opts.programAction == Fortran::frontend::GetDefinition)
100     opts.needProvenanceRangeToCharBlockMappings = true;
101 }
102 
103 static bool ParseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
104     clang::DiagnosticsEngine &diags) {
105   unsigned numErrorsBefore = diags.getNumErrors();
106 
107   // By default the frontend driver creates a ParseSyntaxOnly action.
108   opts.programAction = ParseSyntaxOnly;
109 
110   // Identify the action (i.e. opts.ProgramAction)
111   if (const llvm::opt::Arg *a =
112           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
113     switch (a->getOption().getID()) {
114     default: {
115       llvm_unreachable("Invalid option in group!");
116     }
117     case clang::driver::options::OPT_test_io:
118       opts.programAction = InputOutputTest;
119       break;
120     case clang::driver::options::OPT_E:
121       opts.programAction = PrintPreprocessedInput;
122       break;
123     case clang::driver::options::OPT_fsyntax_only:
124       opts.programAction = ParseSyntaxOnly;
125       break;
126     case clang::driver::options::OPT_emit_obj:
127       opts.programAction = EmitObj;
128       break;
129     case clang::driver::options::OPT_fdebug_unparse:
130       opts.programAction = DebugUnparse;
131       break;
132     case clang::driver::options::OPT_fdebug_unparse_no_sema:
133       opts.programAction = DebugUnparseNoSema;
134       break;
135     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
136       opts.programAction = DebugUnparseWithSymbols;
137       break;
138     case clang::driver::options::OPT_fdebug_dump_symbols:
139       opts.programAction = DebugDumpSymbols;
140       break;
141     case clang::driver::options::OPT_fdebug_dump_parse_tree:
142       opts.programAction = DebugDumpParseTree;
143       break;
144     case clang::driver::options::OPT_fdebug_dump_all:
145       opts.programAction = DebugDumpAll;
146       break;
147     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
148       opts.programAction = DebugDumpParseTreeNoSema;
149       break;
150     case clang::driver::options::OPT_fdebug_dump_provenance:
151       opts.programAction = DebugDumpProvenance;
152       break;
153     case clang::driver::options::OPT_fdebug_dump_parsing_log:
154       opts.programAction = DebugDumpParsingLog;
155       break;
156     case clang::driver::options::OPT_fdebug_measure_parse_tree:
157       opts.programAction = DebugMeasureParseTree;
158       break;
159     case clang::driver::options::OPT_fdebug_pre_fir_tree:
160       opts.programAction = DebugPreFIRTree;
161       break;
162     case clang::driver::options::OPT_fget_symbols_sources:
163       opts.programAction = GetSymbolsSources;
164       break;
165     case clang::driver::options::OPT_fget_definition:
166       opts.programAction = GetDefinition;
167       break;
168     case clang::driver::options::OPT_init_only:
169       opts.programAction = InitOnly;
170       break;
171 
172       // TODO:
173       // case clang::driver::options::OPT_emit_llvm:
174       // case clang::driver::options::OPT_emit_llvm_only:
175       // case clang::driver::options::OPT_emit_codegen_only:
176       // case clang::driver::options::OPT_emit_module:
177       // (...)
178     }
179 
180     // Parse the values provided with `-fget-definition` (there should be 3
181     // integers)
182     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
183         clang::driver::options::OPT_fget_definition) {
184       unsigned optVals[3] = {0, 0, 0};
185 
186       for (unsigned i = 0; i < 3; i++) {
187         llvm::StringRef val = a->getValue(i);
188 
189         if (val.getAsInteger(10, optVals[i])) {
190           // A non-integer was encountered - that's an error.
191           diags.Report(clang::diag::err_drv_invalid_value)
192               << a->getOption().getName() << val;
193           break;
194         }
195       }
196       opts.getDefVals.line = optVals[0];
197       opts.getDefVals.startColumn = optVals[1];
198       opts.getDefVals.endColumn = optVals[2];
199     }
200   }
201 
202   // Parsing -load <dsopath> option and storing shared object path
203   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
204     opts.plugins.push_back(a->getValue());
205   }
206 
207   // Parsing -plugin <name> option and storing plugin name and setting action
208   if (const llvm::opt::Arg *a =
209           args.getLastArg(clang::driver::options::OPT_plugin)) {
210     opts.programAction = PluginAction;
211     opts.ActionName = a->getValue();
212   }
213 
214   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
215   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
216   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
217 
218   // Get the input kind (from the value passed via `-x`)
219   InputKind dashX(Language::Unknown);
220   if (const llvm::opt::Arg *a =
221           args.getLastArg(clang::driver::options::OPT_x)) {
222     llvm::StringRef XValue = a->getValue();
223     // Principal languages.
224     dashX = llvm::StringSwitch<InputKind>(XValue)
225                 .Case("f90", Language::Fortran)
226                 .Default(Language::Unknown);
227 
228     // Some special cases cannot be combined with suffixes.
229     if (dashX.IsUnknown())
230       dashX = llvm::StringSwitch<InputKind>(XValue)
231                   .Case("ir", Language::LLVM_IR)
232                   .Default(Language::Unknown);
233 
234     if (dashX.IsUnknown())
235       diags.Report(clang::diag::err_drv_invalid_value)
236           << a->getAsString(args) << a->getValue();
237   }
238 
239   // Collect the input files and save them in our instance of FrontendOptions.
240   std::vector<std::string> inputs =
241       args.getAllArgValues(clang::driver::options::OPT_INPUT);
242   opts.inputs.clear();
243   if (inputs.empty())
244     // '-' is the default input if none is given.
245     inputs.push_back("-");
246   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
247     InputKind ik = dashX;
248     if (ik.IsUnknown()) {
249       ik = FrontendOptions::GetInputKindForExtension(
250           llvm::StringRef(inputs[i]).rsplit('.').second);
251       if (ik.IsUnknown())
252         ik = Language::Unknown;
253       if (i == 0)
254         dashX = ik;
255     }
256 
257     opts.inputs.emplace_back(std::move(inputs[i]), ik);
258   }
259 
260   // Set fortranForm based on options -ffree-form and -ffixed-form.
261   if (const auto *arg = args.getLastArg(clang::driver::options::OPT_ffixed_form,
262           clang::driver::options::OPT_ffree_form)) {
263     opts.fortranForm =
264         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
265         ? FortranForm::FixedForm
266         : FortranForm::FreeForm;
267   }
268 
269   // Set fixedFormColumns based on -ffixed-line-length=<value>
270   if (const auto *arg =
271           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
272     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
273     std::int64_t columns = -1;
274     if (argValue == "none") {
275       columns = 0;
276     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
277       columns = -1;
278     }
279     if (columns < 0) {
280       diags.Report(clang::diag::err_drv_negative_columns)
281           << arg->getOption().getName() << arg->getValue();
282     } else if (columns == 0) {
283       opts.fixedFormColumns = 1000000;
284     } else if (columns < 7) {
285       diags.Report(clang::diag::err_drv_small_columns)
286           << arg->getOption().getName() << arg->getValue() << "7";
287     } else {
288       opts.fixedFormColumns = columns;
289     }
290   }
291 
292   // -f{no-}implicit-none
293   opts.features.Enable(
294       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
295       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
296           clang::driver::options::OPT_fno_implicit_none, false));
297 
298   // -f{no-}backslash
299   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
300       args.hasFlag(clang::driver::options::OPT_fbackslash,
301           clang::driver::options::OPT_fno_backslash, false));
302 
303   // -f{no-}logical-abbreviations
304   opts.features.Enable(Fortran::common::LanguageFeature::LogicalAbbreviations,
305       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
306           clang::driver::options::OPT_fno_logical_abbreviations, false));
307 
308   // -f{no-}xor-operator
309   opts.features.Enable(Fortran::common::LanguageFeature::XOROperator,
310       args.hasFlag(clang::driver::options::OPT_fxor_operator,
311           clang::driver::options::OPT_fno_xor_operator, false));
312 
313   if (args.hasArg(
314           clang::driver::options::OPT_falternative_parameter_statement)) {
315     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
316   }
317   if (const llvm::opt::Arg *arg =
318           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
319     llvm::StringRef argValue = arg->getValue();
320     if (argValue == "utf-8") {
321       opts.encoding = Fortran::parser::Encoding::UTF_8;
322     } else if (argValue == "latin-1") {
323       opts.encoding = Fortran::parser::Encoding::LATIN_1;
324     } else {
325       diags.Report(clang::diag::err_drv_invalid_value)
326           << arg->getAsString(args) << argValue;
327     }
328   }
329 
330   setUpFrontendBasedOnAction(opts);
331   opts.dashX = dashX;
332 
333   return diags.getNumErrors() == numErrorsBefore;
334 }
335 
336 // Generate the path to look for intrinsic modules
337 static std::string getIntrinsicDir() {
338   // TODO: Find a system independent API
339   llvm::SmallString<128> driverPath;
340   driverPath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
341   llvm::sys::path::remove_filename(driverPath);
342   driverPath.append("/../include/flang/");
343   return std::string(driverPath);
344 }
345 
346 /// Parses all preprocessor input arguments and populates the preprocessor
347 /// options accordingly.
348 ///
349 /// \param [in] opts The preprocessor options instance
350 /// \param [out] args The list of input arguments
351 static void parsePreprocessorArgs(
352     Fortran::frontend::PreprocessorOptions &opts, llvm::opt::ArgList &args) {
353   // Add macros from the command line.
354   for (const auto *currentArg : args.filtered(
355            clang::driver::options::OPT_D, clang::driver::options::OPT_U)) {
356     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
357       opts.addMacroDef(currentArg->getValue());
358     } else {
359       opts.addMacroUndef(currentArg->getValue());
360     }
361   }
362 
363   // Add the ordered list of -I's.
364   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
365     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
366 
367   // Prepend the ordered list of -intrinsic-modules-path
368   // to the default location to search.
369   for (const auto *currentArg :
370       args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
371     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
372 
373   // -cpp/-nocpp
374   if (const auto *currentArg = args.getLastArg(
375           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
376     opts.macrosFlag =
377         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
378         ? PPMacrosFlag::Include
379         : PPMacrosFlag::Exclude;
380 
381   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
382   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
383 }
384 
385 /// Parses all semantic related arguments and populates the variables
386 /// options accordingly. Returns false if new errors are generated.
387 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
388     clang::DiagnosticsEngine &diags) {
389   unsigned numErrorsBefore = diags.getNumErrors();
390 
391   // -J/module-dir option
392   auto moduleDirList =
393       args.getAllArgValues(clang::driver::options::OPT_module_dir);
394   // User can only specify -J/-module-dir once
395   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
396   if (moduleDirList.size() > 1) {
397     const unsigned diagID =
398         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
399             "Only one '-module-dir/-J' option allowed");
400     diags.Report(diagID);
401   }
402   if (moduleDirList.size() == 1)
403     res.SetModuleDir(moduleDirList[0]);
404 
405   // -fdebug-module-writer option
406   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
407     res.SetDebugModuleDir(true);
408   }
409 
410   // -module-suffix
411   if (const auto *moduleSuffix =
412           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
413     res.SetModuleFileSuffix(moduleSuffix->getValue());
414   }
415 
416   // -f{no-}analyzed-objects-for-unparse
417   res.SetUseAnalyzedObjectsForUnparse(
418       args.hasFlag(clang::driver::options::OPT_fanalyzed_objects_for_unparse,
419           clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
420 
421   return diags.getNumErrors() == numErrorsBefore;
422 }
423 
424 /// Parses all diagnostics related arguments and populates the variables
425 /// options accordingly. Returns false if new errors are generated.
426 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
427     clang::DiagnosticsEngine &diags) {
428   unsigned numErrorsBefore = diags.getNumErrors();
429 
430   // -Werror option
431   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
432   // this has to change when other -W<opt>'s are supported.
433   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
434     if (args.getLastArgValue(clang::driver::options::OPT_W_Joined)
435             .equals("error")) {
436       res.SetWarnAsErr(true);
437     } else {
438       const unsigned diagID =
439           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
440               "Only `-Werror` is supported currently.");
441       diags.Report(diagID);
442     }
443   }
444 
445   return diags.getNumErrors() == numErrorsBefore;
446 }
447 
448 /// Parses all Dialect related arguments and populates the variables
449 /// options accordingly. Returns false if new errors are generated.
450 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
451     clang::DiagnosticsEngine &diags) {
452   unsigned numErrorsBefore = diags.getNumErrors();
453 
454   // -fdefault* family
455   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
456     res.defaultKinds().set_defaultRealKind(8);
457     res.defaultKinds().set_doublePrecisionKind(16);
458   }
459   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
460     res.defaultKinds().set_defaultIntegerKind(8);
461     res.defaultKinds().set_subscriptIntegerKind(8);
462     res.defaultKinds().set_sizeIntegerKind(8);
463   }
464   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
465     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
466       // -fdefault-double-8 has to be used with -fdefault-real-8
467       // to be compatible with gfortran
468       const unsigned diagID =
469           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
470               "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
471       diags.Report(diagID);
472     }
473     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
474     res.defaultKinds().set_doublePrecisionKind(8);
475   }
476   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
477     res.defaultKinds().set_sizeIntegerKind(8);
478 
479   // -fopenmp and -fopenacc
480   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
481     res.frontendOpts().features.Enable(
482         Fortran::common::LanguageFeature::OpenACC);
483   }
484   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
485     res.frontendOpts().features.Enable(
486         Fortran::common::LanguageFeature::OpenMP);
487   }
488 
489   // -pedantic
490   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
491     res.set_EnableConformanceChecks();
492   }
493   // -std=f2018 (currently this implies -pedantic)
494   // TODO: Set proper options when more fortran standards
495   // are supported.
496   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
497     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
498     // We only allow f2018 as the given standard
499     if (standard.equals("f2018")) {
500       res.set_EnableConformanceChecks();
501     } else {
502       const unsigned diagID =
503           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
504               "Only -std=f2018 is allowed currently.");
505       diags.Report(diagID);
506     }
507   }
508   return diags.getNumErrors() == numErrorsBefore;
509 }
510 
511 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &res,
512     llvm::ArrayRef<const char *> commandLineArgs,
513     clang::DiagnosticsEngine &diags) {
514 
515   bool success = true;
516 
517   // Parse the arguments
518   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
519   const unsigned includedFlagsBitmask = clang::driver::options::FC1Option;
520   unsigned missingArgIndex, missingArgCount;
521   llvm::opt::InputArgList args = opts.ParseArgs(
522       commandLineArgs, missingArgIndex, missingArgCount, includedFlagsBitmask);
523 
524   // Check for missing argument error.
525   if (missingArgCount) {
526     diags.Report(clang::diag::err_drv_missing_argument)
527         << args.getArgString(missingArgIndex) << missingArgCount;
528     success = false;
529   }
530 
531   // Issue errors on unknown arguments
532   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
533     auto argString = a->getAsString(args);
534     std::string nearest;
535     if (opts.findNearest(argString, nearest, includedFlagsBitmask) > 1)
536       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
537     else
538       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
539           << argString << nearest;
540     success = false;
541   }
542 
543   success &= ParseFrontendArgs(res.frontendOpts(), args, diags);
544   parsePreprocessorArgs(res.preprocessorOpts(), args);
545   success &= parseSemaArgs(res, args, diags);
546   success &= parseDialectArgs(res, args, diags);
547   success &= parseDiagArgs(res, args, diags);
548 
549   return success;
550 }
551 
552 void CompilerInvocation::collectMacroDefinitions() {
553   auto &ppOpts = this->preprocessorOpts();
554 
555   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
556     llvm::StringRef macro = ppOpts.macros[i].first;
557     bool isUndef = ppOpts.macros[i].second;
558 
559     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
560     llvm::StringRef macroName = macroPair.first;
561     llvm::StringRef macroBody = macroPair.second;
562 
563     // For an #undef'd macro, we only care about the name.
564     if (isUndef) {
565       parserOpts_.predefinitions.emplace_back(
566           macroName.str(), std::optional<std::string>{});
567       continue;
568     }
569 
570     // For a #define'd macro, figure out the actual definition.
571     if (macroName.size() == macro.size())
572       macroBody = "1";
573     else {
574       // Note: GCC drops anything following an end-of-line character.
575       llvm::StringRef::size_type End = macroBody.find_first_of("\n\r");
576       macroBody = macroBody.substr(0, End);
577     }
578     parserOpts_.predefinitions.emplace_back(
579         macroName, std::optional<std::string>(macroBody.str()));
580   }
581 }
582 
583 void CompilerInvocation::SetDefaultFortranOpts() {
584   auto &fortranOptions = fortranOpts();
585 
586   std::vector<std::string> searchDirectories{"."s};
587   fortranOptions.searchDirectories = searchDirectories;
588   fortranOptions.isFixedForm = false;
589 }
590 
591 // TODO: When expanding this method, consider creating a dedicated API for
592 // this. Also at some point we will need to differentiate between different
593 // targets and add dedicated predefines for each.
594 void CompilerInvocation::setDefaultPredefinitions() {
595   auto &fortranOptions = fortranOpts();
596   const auto &frontendOptions = frontendOpts();
597 
598   // Populate the macro list with version numbers and other predefinitions.
599   fortranOptions.predefinitions.emplace_back("__flang__", "1");
600   fortranOptions.predefinitions.emplace_back(
601       "__flang_major__", FLANG_VERSION_MAJOR_STRING);
602   fortranOptions.predefinitions.emplace_back(
603       "__flang_minor__", FLANG_VERSION_MINOR_STRING);
604   fortranOptions.predefinitions.emplace_back(
605       "__flang_patchlevel__", FLANG_VERSION_PATCHLEVEL_STRING);
606 
607   // Add predefinitions based on extensions enabled
608   if (frontendOptions.features.IsEnabled(
609           Fortran::common::LanguageFeature::OpenACC)) {
610     fortranOptions.predefinitions.emplace_back("_OPENACC", "202011");
611   }
612   if (frontendOptions.features.IsEnabled(
613           Fortran::common::LanguageFeature::OpenMP)) {
614     fortranOptions.predefinitions.emplace_back("_OPENMP", "201511");
615   }
616 }
617 
618 void CompilerInvocation::setFortranOpts() {
619   auto &fortranOptions = fortranOpts();
620   const auto &frontendOptions = frontendOpts();
621   const auto &preprocessorOptions = preprocessorOpts();
622   auto &moduleDirJ = moduleDir();
623 
624   if (frontendOptions.fortranForm != FortranForm::Unknown) {
625     fortranOptions.isFixedForm =
626         frontendOptions.fortranForm == FortranForm::FixedForm;
627   }
628   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
629 
630   fortranOptions.features = frontendOptions.features;
631   fortranOptions.encoding = frontendOptions.encoding;
632 
633   // Adding search directories specified by -I
634   fortranOptions.searchDirectories.insert(
635       fortranOptions.searchDirectories.end(),
636       preprocessorOptions.searchDirectoriesFromDashI.begin(),
637       preprocessorOptions.searchDirectoriesFromDashI.end());
638 
639   // Add the ordered list of -intrinsic-modules-path
640   fortranOptions.searchDirectories.insert(
641       fortranOptions.searchDirectories.end(),
642       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
643       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
644 
645   //  Add the default intrinsic module directory at the end
646   fortranOptions.searchDirectories.emplace_back(getIntrinsicDir());
647 
648   // Add the directory supplied through -J/-module-dir to the list of search
649   // directories
650   if (moduleDirJ.compare(".") != 0)
651     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
652 
653   if (frontendOptions.instrumentedParse)
654     fortranOptions.instrumentedParse = true;
655 
656   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
657     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
658 
659   if (enableConformanceChecks()) {
660     fortranOptions.features.WarnOnAllNonstandard();
661   }
662 }
663 
664 void CompilerInvocation::setSemanticsOpts(
665     Fortran::parser::AllCookedSources &allCookedSources) {
666   const auto &fortranOptions = fortranOpts();
667 
668   semanticsContext_ = std::make_unique<semantics::SemanticsContext>(
669       defaultKinds(), fortranOptions.features, allCookedSources);
670 
671   semanticsContext_->set_moduleDirectory(moduleDir())
672       .set_searchDirectories(fortranOptions.searchDirectories)
673       .set_warnOnNonstandardUsage(enableConformanceChecks())
674       .set_warningsAreErrors(warnAsErr())
675       .set_moduleFileSuffix(moduleFileSuffix());
676 }
677