xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 23d4c4f3fb12e127a5f07a7082f33b02082bb3f5) 
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   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
203   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
204   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
205 
206   // Get the input kind (from the value passed via `-x`)
207   InputKind dashX(Language::Unknown);
208   if (const llvm::opt::Arg *a =
209           args.getLastArg(clang::driver::options::OPT_x)) {
210     llvm::StringRef XValue = a->getValue();
211     // Principal languages.
212     dashX = llvm::StringSwitch<InputKind>(XValue)
213                 .Case("f90", Language::Fortran)
214                 .Default(Language::Unknown);
215 
216     // Some special cases cannot be combined with suffixes.
217     if (dashX.IsUnknown())
218       dashX = llvm::StringSwitch<InputKind>(XValue)
219                   .Case("ir", Language::LLVM_IR)
220                   .Default(Language::Unknown);
221 
222     if (dashX.IsUnknown())
223       diags.Report(clang::diag::err_drv_invalid_value)
224           << a->getAsString(args) << a->getValue();
225   }
226 
227   // Collect the input files and save them in our instance of FrontendOptions.
228   std::vector<std::string> inputs =
229       args.getAllArgValues(clang::driver::options::OPT_INPUT);
230   opts.inputs.clear();
231   if (inputs.empty())
232     // '-' is the default input if none is given.
233     inputs.push_back("-");
234   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
235     InputKind ik = dashX;
236     if (ik.IsUnknown()) {
237       ik = FrontendOptions::GetInputKindForExtension(
238           llvm::StringRef(inputs[i]).rsplit('.').second);
239       if (ik.IsUnknown())
240         ik = Language::Unknown;
241       if (i == 0)
242         dashX = ik;
243     }
244 
245     opts.inputs.emplace_back(std::move(inputs[i]), ik);
246   }
247 
248   // Set fortranForm based on options -ffree-form and -ffixed-form.
249   if (const auto *arg = args.getLastArg(clang::driver::options::OPT_ffixed_form,
250           clang::driver::options::OPT_ffree_form)) {
251     opts.fortranForm =
252         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
253         ? FortranForm::FixedForm
254         : FortranForm::FreeForm;
255   }
256 
257   // Set fixedFormColumns based on -ffixed-line-length=<value>
258   if (const auto *arg =
259           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
260     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
261     std::int64_t columns = -1;
262     if (argValue == "none") {
263       columns = 0;
264     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
265       columns = -1;
266     }
267     if (columns < 0) {
268       diags.Report(clang::diag::err_drv_negative_columns)
269           << arg->getOption().getName() << arg->getValue();
270     } else if (columns == 0) {
271       opts.fixedFormColumns = 1000000;
272     } else if (columns < 7) {
273       diags.Report(clang::diag::err_drv_small_columns)
274           << arg->getOption().getName() << arg->getValue() << "7";
275     } else {
276       opts.fixedFormColumns = columns;
277     }
278   }
279 
280   if (const llvm::opt::Arg *arg =
281           args.getLastArg(clang::driver::options::OPT_fimplicit_none,
282               clang::driver::options::OPT_fno_implicit_none)) {
283     opts.features.Enable(
284         Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
285         arg->getOption().matches(clang::driver::options::OPT_fimplicit_none));
286   }
287   if (const llvm::opt::Arg *arg =
288           args.getLastArg(clang::driver::options::OPT_fbackslash,
289               clang::driver::options::OPT_fno_backslash)) {
290     opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
291         arg->getOption().matches(clang::driver::options::OPT_fbackslash));
292   }
293   if (const llvm::opt::Arg *arg =
294           args.getLastArg(clang::driver::options::OPT_flogical_abbreviations,
295               clang::driver::options::OPT_fno_logical_abbreviations)) {
296     opts.features.Enable(Fortran::common::LanguageFeature::LogicalAbbreviations,
297         arg->getOption().matches(
298             clang::driver::options::OPT_flogical_abbreviations));
299   }
300   if (const llvm::opt::Arg *arg =
301           args.getLastArg(clang::driver::options::OPT_fxor_operator,
302               clang::driver::options::OPT_fno_xor_operator)) {
303     opts.features.Enable(Fortran::common::LanguageFeature::XOROperator,
304         arg->getOption().matches(clang::driver::options::OPT_fxor_operator));
305   }
306   if (args.hasArg(
307           clang::driver::options::OPT_falternative_parameter_statement)) {
308     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
309   }
310   if (const llvm::opt::Arg *arg =
311           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
312     llvm::StringRef argValue = arg->getValue();
313     if (argValue == "utf-8") {
314       opts.encoding = Fortran::parser::Encoding::UTF_8;
315     } else if (argValue == "latin-1") {
316       opts.encoding = Fortran::parser::Encoding::LATIN_1;
317     } else {
318       diags.Report(clang::diag::err_drv_invalid_value)
319           << arg->getAsString(args) << argValue;
320     }
321   }
322 
323   setUpFrontendBasedOnAction(opts);
324   opts.dashX = dashX;
325 
326   return diags.getNumErrors() == numErrorsBefore;
327 }
328 
329 // Generate the path to look for intrinsic modules
330 static std::string getIntrinsicDir() {
331   // TODO: Find a system independent API
332   llvm::SmallString<128> driverPath;
333   driverPath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
334   llvm::sys::path::remove_filename(driverPath);
335   driverPath.append("/../include/flang/");
336   return std::string(driverPath);
337 }
338 
339 /// Parses all preprocessor input arguments and populates the preprocessor
340 /// options accordingly.
341 ///
342 /// \param [in] opts The preprocessor options instance
343 /// \param [out] args The list of input arguments
344 static void parsePreprocessorArgs(
345     Fortran::frontend::PreprocessorOptions &opts, llvm::opt::ArgList &args) {
346   // Add macros from the command line.
347   for (const auto *currentArg : args.filtered(
348            clang::driver::options::OPT_D, clang::driver::options::OPT_U)) {
349     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
350       opts.addMacroDef(currentArg->getValue());
351     } else {
352       opts.addMacroUndef(currentArg->getValue());
353     }
354   }
355 
356   // Add the ordered list of -I's.
357   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
358     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
359 
360   // Prepend the ordered list of -intrinsic-modules-path
361   // to the default location to search.
362   for (const auto *currentArg :
363       args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
364     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
365 
366   // -cpp/-nocpp
367   if (const auto *currentArg = args.getLastArg(
368           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
369     opts.macrosFlag =
370         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
371         ? PPMacrosFlag::Include
372         : PPMacrosFlag::Exclude;
373 
374   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
375   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
376 }
377 
378 /// Parses all semantic related arguments and populates the variables
379 /// options accordingly. Returns false if new errors are generated.
380 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
381     clang::DiagnosticsEngine &diags) {
382   unsigned numErrorsBefore = diags.getNumErrors();
383 
384   // -J/module-dir option
385   auto moduleDirList =
386       args.getAllArgValues(clang::driver::options::OPT_module_dir);
387   // User can only specify -J/-module-dir once
388   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
389   if (moduleDirList.size() > 1) {
390     const unsigned diagID =
391         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
392             "Only one '-module-dir/-J' option allowed");
393     diags.Report(diagID);
394   }
395   if (moduleDirList.size() == 1)
396     res.SetModuleDir(moduleDirList[0]);
397 
398   // -fdebug-module-writer option
399   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
400     res.SetDebugModuleDir(true);
401   }
402 
403   // -module-suffix
404   if (const auto *moduleSuffix =
405           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
406     res.SetModuleFileSuffix(moduleSuffix->getValue());
407   }
408 
409   // -fno-analyzed-objects-for-unparse
410   if (args.hasArg(
411           clang::driver::options::OPT_fno_analyzed_objects_for_unparse)) {
412     res.SetUseAnalyzedObjectsForUnparse(false);
413   }
414 
415   return diags.getNumErrors() == numErrorsBefore;
416 }
417 
418 /// Parses all diagnostics related arguments and populates the variables
419 /// options accordingly. Returns false if new errors are generated.
420 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
421     clang::DiagnosticsEngine &diags) {
422   unsigned numErrorsBefore = diags.getNumErrors();
423 
424   // -Werror option
425   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
426   // this has to change when other -W<opt>'s are supported.
427   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
428     if (args.getLastArgValue(clang::driver::options::OPT_W_Joined)
429             .equals("error")) {
430       res.SetWarnAsErr(true);
431     } else {
432       const unsigned diagID =
433           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
434               "Only `-Werror` is supported currently.");
435       diags.Report(diagID);
436     }
437   }
438 
439   return diags.getNumErrors() == numErrorsBefore;
440 }
441 
442 /// Parses all Dialect related arguments and populates the variables
443 /// options accordingly. Returns false if new errors are generated.
444 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
445     clang::DiagnosticsEngine &diags) {
446   unsigned numErrorsBefore = diags.getNumErrors();
447 
448   // -fdefault* family
449   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
450     res.defaultKinds().set_defaultRealKind(8);
451     res.defaultKinds().set_doublePrecisionKind(16);
452   }
453   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
454     res.defaultKinds().set_defaultIntegerKind(8);
455     res.defaultKinds().set_subscriptIntegerKind(8);
456     res.defaultKinds().set_sizeIntegerKind(8);
457   }
458   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
459     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
460       // -fdefault-double-8 has to be used with -fdefault-real-8
461       // to be compatible with gfortran
462       const unsigned diagID =
463           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
464               "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
465       diags.Report(diagID);
466     }
467     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
468     res.defaultKinds().set_doublePrecisionKind(8);
469   }
470   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
471     res.defaultKinds().set_sizeIntegerKind(8);
472 
473   // -fopenmp and -fopenacc
474   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
475     res.frontendOpts().features.Enable(
476         Fortran::common::LanguageFeature::OpenACC);
477   }
478   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
479     res.frontendOpts().features.Enable(
480         Fortran::common::LanguageFeature::OpenMP);
481   }
482 
483   // -pedantic
484   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
485     res.set_EnableConformanceChecks();
486   }
487   // -std=f2018 (currently this implies -pedantic)
488   // TODO: Set proper options when more fortran standards
489   // are supported.
490   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
491     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
492     // We only allow f2018 as the given standard
493     if (standard.equals("f2018")) {
494       res.set_EnableConformanceChecks();
495     } else {
496       const unsigned diagID =
497           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
498               "Only -std=f2018 is allowed currently.");
499       diags.Report(diagID);
500     }
501   }
502   return diags.getNumErrors() == numErrorsBefore;
503 }
504 
505 bool CompilerInvocation::CreateFromArgs(CompilerInvocation &res,
506     llvm::ArrayRef<const char *> commandLineArgs,
507     clang::DiagnosticsEngine &diags) {
508 
509   bool success = true;
510 
511   // Parse the arguments
512   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
513   const unsigned includedFlagsBitmask = clang::driver::options::FC1Option;
514   unsigned missingArgIndex, missingArgCount;
515   llvm::opt::InputArgList args = opts.ParseArgs(
516       commandLineArgs, missingArgIndex, missingArgCount, includedFlagsBitmask);
517 
518   // Check for missing argument error.
519   if (missingArgCount) {
520     diags.Report(clang::diag::err_drv_missing_argument)
521         << args.getArgString(missingArgIndex) << missingArgCount;
522     success = false;
523   }
524 
525   // Issue errors on unknown arguments
526   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
527     auto argString = a->getAsString(args);
528     std::string nearest;
529     if (opts.findNearest(argString, nearest, includedFlagsBitmask) > 1)
530       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
531     else
532       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
533           << argString << nearest;
534     success = false;
535   }
536 
537   success &= ParseFrontendArgs(res.frontendOpts(), args, diags);
538   parsePreprocessorArgs(res.preprocessorOpts(), args);
539   success &= parseSemaArgs(res, args, diags);
540   success &= parseDialectArgs(res, args, diags);
541   success &= parseDiagArgs(res, args, diags);
542 
543   return success;
544 }
545 
546 void CompilerInvocation::collectMacroDefinitions() {
547   auto &ppOpts = this->preprocessorOpts();
548 
549   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
550     llvm::StringRef macro = ppOpts.macros[i].first;
551     bool isUndef = ppOpts.macros[i].second;
552 
553     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
554     llvm::StringRef macroName = macroPair.first;
555     llvm::StringRef macroBody = macroPair.second;
556 
557     // For an #undef'd macro, we only care about the name.
558     if (isUndef) {
559       parserOpts_.predefinitions.emplace_back(
560           macroName.str(), std::optional<std::string>{});
561       continue;
562     }
563 
564     // For a #define'd macro, figure out the actual definition.
565     if (macroName.size() == macro.size())
566       macroBody = "1";
567     else {
568       // Note: GCC drops anything following an end-of-line character.
569       llvm::StringRef::size_type End = macroBody.find_first_of("\n\r");
570       macroBody = macroBody.substr(0, End);
571     }
572     parserOpts_.predefinitions.emplace_back(
573         macroName, std::optional<std::string>(macroBody.str()));
574   }
575 }
576 
577 void CompilerInvocation::SetDefaultFortranOpts() {
578   auto &fortranOptions = fortranOpts();
579 
580   // These defaults are based on the defaults in f18/f18.cpp.
581   std::vector<std::string> searchDirectories{"."s};
582   fortranOptions.searchDirectories = searchDirectories;
583   fortranOptions.isFixedForm = false;
584 }
585 
586 // TODO: When expanding this method, consider creating a dedicated API for
587 // this. Also at some point we will need to differentiate between different
588 // targets and add dedicated predefines for each.
589 void CompilerInvocation::setDefaultPredefinitions() {
590   auto &fortranOptions = fortranOpts();
591   const auto &frontendOptions = frontendOpts();
592 
593   // Populate the macro list with version numbers and other predefinitions.
594   fortranOptions.predefinitions.emplace_back("__flang__", "1");
595   fortranOptions.predefinitions.emplace_back(
596       "__flang_major__", FLANG_VERSION_MAJOR_STRING);
597   fortranOptions.predefinitions.emplace_back(
598       "__flang_minor__", FLANG_VERSION_MINOR_STRING);
599   fortranOptions.predefinitions.emplace_back(
600       "__flang_patchlevel__", FLANG_VERSION_PATCHLEVEL_STRING);
601 
602   // Add predefinitions based on extensions enabled
603   if (frontendOptions.features.IsEnabled(
604           Fortran::common::LanguageFeature::OpenACC)) {
605     fortranOptions.predefinitions.emplace_back("_OPENACC", "202011");
606   }
607   if (frontendOptions.features.IsEnabled(
608           Fortran::common::LanguageFeature::OpenMP)) {
609     fortranOptions.predefinitions.emplace_back("_OPENMP", "201511");
610   }
611 }
612 
613 void CompilerInvocation::setFortranOpts() {
614   auto &fortranOptions = fortranOpts();
615   const auto &frontendOptions = frontendOpts();
616   const auto &preprocessorOptions = preprocessorOpts();
617   auto &moduleDirJ = moduleDir();
618 
619   if (frontendOptions.fortranForm != FortranForm::Unknown) {
620     fortranOptions.isFixedForm =
621         frontendOptions.fortranForm == FortranForm::FixedForm;
622   }
623   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
624 
625   fortranOptions.features = frontendOptions.features;
626   fortranOptions.encoding = frontendOptions.encoding;
627 
628   // Adding search directories specified by -I
629   fortranOptions.searchDirectories.insert(
630       fortranOptions.searchDirectories.end(),
631       preprocessorOptions.searchDirectoriesFromDashI.begin(),
632       preprocessorOptions.searchDirectoriesFromDashI.end());
633 
634   // Add the ordered list of -intrinsic-modules-path
635   fortranOptions.searchDirectories.insert(
636       fortranOptions.searchDirectories.end(),
637       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
638       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
639 
640   //  Add the default intrinsic module directory at the end
641   fortranOptions.searchDirectories.emplace_back(getIntrinsicDir());
642 
643   // Add the directory supplied through -J/-module-dir to the list of search
644   // directories
645   if (moduleDirJ.compare(".") != 0)
646     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
647 
648   if (frontendOptions.instrumentedParse)
649     fortranOptions.instrumentedParse = true;
650 
651   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
652     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
653 
654   if (enableConformanceChecks()) {
655     fortranOptions.features.WarnOnAllNonstandard();
656   }
657 }
658 
659 void CompilerInvocation::setSemanticsOpts(
660     Fortran::parser::AllCookedSources &allCookedSources) {
661   const auto &fortranOptions = fortranOpts();
662 
663   semanticsContext_ = std::make_unique<semantics::SemanticsContext>(
664       defaultKinds(), fortranOptions.features, allCookedSources);
665 
666   semanticsContext_->set_moduleDirectory(moduleDir())
667       .set_searchDirectories(fortranOptions.searchDirectories)
668       .set_warnOnNonstandardUsage(enableConformanceChecks())
669       .set_warningsAreErrors(warnAsErr())
670       .set_moduleFileSuffix(moduleFileSuffix());
671 }
672