xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 6ffea74f7c2cda7de91879a771daa6d45da198d9) 
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 // Coding style: https://mlir.llvm.org/getting_started/DeveloperGuide/
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "flang/Frontend/CompilerInvocation.h"
14 #include "flang/Common/Fortran-features.h"
15 #include "flang/Common/OpenMP-features.h"
16 #include "flang/Common/Version.h"
17 #include "flang/Frontend/CodeGenOptions.h"
18 #include "flang/Frontend/PreprocessorOptions.h"
19 #include "flang/Frontend/TargetOptions.h"
20 #include "flang/Semantics/semantics.h"
21 #include "flang/Version.inc"
22 #include "clang/Basic/AllDiagnostics.h"
23 #include "clang/Basic/DiagnosticDriver.h"
24 #include "clang/Basic/DiagnosticOptions.h"
25 #include "clang/Driver/DriverDiagnostic.h"
26 #include "clang/Driver/OptionUtils.h"
27 #include "clang/Driver/Options.h"
28 #include "llvm/ADT/StringRef.h"
29 #include "llvm/ADT/StringSwitch.h"
30 #include "llvm/Frontend/Debug/Options.h"
31 #include "llvm/Option/Arg.h"
32 #include "llvm/Option/ArgList.h"
33 #include "llvm/Option/OptTable.h"
34 #include "llvm/Support/FileSystem.h"
35 #include "llvm/Support/FileUtilities.h"
36 #include "llvm/Support/Path.h"
37 #include "llvm/Support/Process.h"
38 #include "llvm/Support/raw_ostream.h"
39 #include "llvm/TargetParser/Host.h"
40 #include "llvm/TargetParser/Triple.h"
41 #include <cstdlib>
42 #include <memory>
43 #include <optional>
44 
45 using namespace Fortran::frontend;
46 
47 //===----------------------------------------------------------------------===//
48 // Initialization.
49 //===----------------------------------------------------------------------===//
50 CompilerInvocationBase::CompilerInvocationBase()
51     : diagnosticOpts(new clang::DiagnosticOptions()),
52       preprocessorOpts(new PreprocessorOptions()) {}
53 
54 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &x)
55     : diagnosticOpts(new clang::DiagnosticOptions(x.getDiagnosticOpts())),
56       preprocessorOpts(new PreprocessorOptions(x.getPreprocessorOpts())) {}
57 
58 CompilerInvocationBase::~CompilerInvocationBase() = default;
59 
60 //===----------------------------------------------------------------------===//
61 // Deserialization (from args)
62 //===----------------------------------------------------------------------===//
63 static bool parseShowColorsArgs(const llvm::opt::ArgList &args,
64                                 bool defaultColor = true) {
65   // Color diagnostics default to auto ("on" if terminal supports) in the
66   // compiler driver `flang-new` but default to off in the frontend driver
67   // `flang-new -fc1`, needing an explicit OPT_fdiagnostics_color.
68   // Support both clang's -f[no-]color-diagnostics and gcc's
69   // -f[no-]diagnostics-colors[=never|always|auto].
70   enum {
71     Colors_On,
72     Colors_Off,
73     Colors_Auto
74   } showColors = defaultColor ? Colors_Auto : Colors_Off;
75 
76   for (auto *a : args) {
77     const llvm::opt::Option &opt = a->getOption();
78     if (opt.matches(clang::driver::options::OPT_fcolor_diagnostics)) {
79       showColors = Colors_On;
80     } else if (opt.matches(clang::driver::options::OPT_fno_color_diagnostics)) {
81       showColors = Colors_Off;
82     } else if (opt.matches(clang::driver::options::OPT_fdiagnostics_color_EQ)) {
83       llvm::StringRef value(a->getValue());
84       if (value == "always")
85         showColors = Colors_On;
86       else if (value == "never")
87         showColors = Colors_Off;
88       else if (value == "auto")
89         showColors = Colors_Auto;
90     }
91   }
92 
93   return showColors == Colors_On ||
94          (showColors == Colors_Auto &&
95           llvm::sys::Process::StandardErrHasColors());
96 }
97 
98 /// Extracts the optimisation level from \a args.
99 static unsigned getOptimizationLevel(llvm::opt::ArgList &args,
100                                      clang::DiagnosticsEngine &diags) {
101   unsigned defaultOpt = llvm::CodeGenOpt::None;
102 
103   if (llvm::opt::Arg *a =
104           args.getLastArg(clang::driver::options::OPT_O_Group)) {
105     if (a->getOption().matches(clang::driver::options::OPT_O0))
106       return llvm::CodeGenOpt::None;
107 
108     assert(a->getOption().matches(clang::driver::options::OPT_O));
109 
110     return getLastArgIntValue(args, clang::driver::options::OPT_O, defaultOpt,
111                               diags);
112   }
113 
114   return defaultOpt;
115 }
116 
117 bool Fortran::frontend::parseDiagnosticArgs(clang::DiagnosticOptions &opts,
118                                             llvm::opt::ArgList &args) {
119   opts.ShowColors = parseShowColorsArgs(args);
120 
121   return true;
122 }
123 
124 static bool parseDebugArgs(Fortran::frontend::CodeGenOptions &opts,
125                            llvm::opt::ArgList &args,
126                            clang::DiagnosticsEngine &diags) {
127   using DebugInfoKind = llvm::codegenoptions::DebugInfoKind;
128   if (llvm::opt::Arg *arg =
129           args.getLastArg(clang::driver::options::OPT_debug_info_kind_EQ)) {
130     std::optional<DebugInfoKind> val =
131         llvm::StringSwitch<std::optional<DebugInfoKind>>(arg->getValue())
132             .Case("line-tables-only", llvm::codegenoptions::DebugLineTablesOnly)
133             .Case("line-directives-only",
134                   llvm::codegenoptions::DebugDirectivesOnly)
135             .Case("constructor", llvm::codegenoptions::DebugInfoConstructor)
136             .Case("limited", llvm::codegenoptions::LimitedDebugInfo)
137             .Case("standalone", llvm::codegenoptions::FullDebugInfo)
138             .Case("unused-types", llvm::codegenoptions::UnusedTypeInfo)
139             .Default(std::nullopt);
140     if (!val.has_value()) {
141       diags.Report(clang::diag::err_drv_invalid_value)
142           << arg->getAsString(args) << arg->getValue();
143       return false;
144     }
145     opts.setDebugInfo(val.value());
146     if (val != llvm::codegenoptions::DebugLineTablesOnly &&
147         val != llvm::codegenoptions::NoDebugInfo) {
148       const auto debugWarning = diags.getCustomDiagID(
149           clang::DiagnosticsEngine::Warning, "Unsupported debug option: %0");
150       diags.Report(debugWarning) << arg->getValue();
151     }
152   }
153   return true;
154 }
155 
156 // Generate an OptRemark object containing info on if the -Rgroup
157 // specified is enabled or not.
158 static CodeGenOptions::OptRemark
159 parseOptimizationRemark(clang::DiagnosticsEngine &diags,
160                         llvm::opt::ArgList &args, llvm::opt::OptSpecifier optEq,
161                         llvm::StringRef remarkOptName) {
162   assert((remarkOptName == "pass" || remarkOptName == "pass-missed" ||
163           remarkOptName == "pass-analysis") &&
164          "Unsupported remark option name provided.");
165   CodeGenOptions::OptRemark result;
166 
167   for (llvm::opt::Arg *a : args) {
168     if (a->getOption().matches(clang::driver::options::OPT_R_Joined)) {
169       llvm::StringRef value = a->getValue();
170 
171       if (value == remarkOptName) {
172         result.Kind = CodeGenOptions::RemarkKind::RK_Enabled;
173         // Enable everything
174         result.Pattern = ".*";
175         result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
176 
177       } else if (value.split('-') ==
178                  std::make_pair(llvm::StringRef("no"), remarkOptName)) {
179         result.Kind = CodeGenOptions::RemarkKind::RK_Disabled;
180         // Disable everything
181         result.Pattern = "";
182         result.Regex = nullptr;
183       }
184     } else if (a->getOption().matches(optEq)) {
185       result.Kind = CodeGenOptions::RemarkKind::RK_WithPattern;
186       result.Pattern = a->getValue();
187       result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
188       std::string regexError;
189 
190       if (!result.Regex->isValid(regexError)) {
191         diags.Report(clang::diag::err_drv_optimization_remark_pattern)
192             << regexError << a->getAsString(args);
193         return CodeGenOptions::OptRemark();
194       }
195     }
196   }
197   return result;
198 }
199 
200 static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
201                              llvm::opt::ArgList &args,
202                              clang::DiagnosticsEngine &diags) {
203   opts.OptimizationLevel = getOptimizationLevel(args, diags);
204 
205   if (args.hasFlag(clang::driver::options::OPT_fdebug_pass_manager,
206                    clang::driver::options::OPT_fno_debug_pass_manager, false))
207     opts.DebugPassManager = 1;
208 
209   if (args.hasFlag(clang::driver::options::OPT_fstack_arrays,
210                    clang::driver::options::OPT_fno_stack_arrays, false))
211     opts.StackArrays = 1;
212 
213   if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
214                    clang::driver::options::OPT_fno_loop_versioning, false))
215     opts.LoopVersioning = 1;
216 
217   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
218     opts.LLVMPassPlugins.push_back(a->getValue());
219 
220   // -fembed-offload-object option
221   for (auto *a :
222        args.filtered(clang::driver::options::OPT_fembed_offload_object_EQ))
223     opts.OffloadObjects.push_back(a->getValue());
224 
225   // -flto=full/thin option.
226   if (const llvm::opt::Arg *a =
227           args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
228     llvm::StringRef s = a->getValue();
229     assert((s == "full" || s == "thin") && "Unknown LTO mode.");
230     if (s == "full")
231       opts.PrepareForFullLTO = true;
232     else
233       opts.PrepareForThinLTO = true;
234   }
235 
236   // -f[no-]save-optimization-record[=<format>]
237   if (const llvm::opt::Arg *a =
238           args.getLastArg(clang::driver::options::OPT_opt_record_file))
239     opts.OptRecordFile = a->getValue();
240 
241   // Optimization file format. Defaults to yaml
242   if (const llvm::opt::Arg *a =
243           args.getLastArg(clang::driver::options::OPT_opt_record_format))
244     opts.OptRecordFormat = a->getValue();
245 
246   // Specifies, using a regex, which successful optimization passes(middle and
247   // backend), to include in the final optimization record file generated. If
248   // not provided -fsave-optimization-record will include all passes.
249   if (const llvm::opt::Arg *a =
250           args.getLastArg(clang::driver::options::OPT_opt_record_passes))
251     opts.OptRecordPasses = a->getValue();
252 
253   // Create OptRemark that allows printing of all successful optimization
254   // passes applied.
255   opts.OptimizationRemark =
256       parseOptimizationRemark(diags, args, clang::driver::options::OPT_Rpass_EQ,
257                               /*remarkOptName=*/"pass");
258 
259   // Create OptRemark that allows all missed optimization passes to be printed.
260   opts.OptimizationRemarkMissed = parseOptimizationRemark(
261       diags, args, clang::driver::options::OPT_Rpass_missed_EQ,
262       /*remarkOptName=*/"pass-missed");
263 
264   // Create OptRemark that allows all optimization decisions made by LLVM
265   // to be printed.
266   opts.OptimizationRemarkAnalysis = parseOptimizationRemark(
267       diags, args, clang::driver::options::OPT_Rpass_analysis_EQ,
268       /*remarkOptName=*/"pass-analysis");
269 
270   if (opts.getDebugInfo() == llvm::codegenoptions::NoDebugInfo) {
271     // If the user requested a flag that requires source locations available in
272     // the backend, make sure that the backend tracks source location
273     // information.
274     bool needLocTracking = !opts.OptRecordFile.empty() ||
275                            !opts.OptRecordPasses.empty() ||
276                            !opts.OptRecordFormat.empty() ||
277                            opts.OptimizationRemark.hasValidPattern() ||
278                            opts.OptimizationRemarkMissed.hasValidPattern() ||
279                            opts.OptimizationRemarkAnalysis.hasValidPattern();
280 
281     if (needLocTracking)
282       opts.setDebugInfo(llvm::codegenoptions::LocTrackingOnly);
283   }
284 
285   if (auto *a = args.getLastArg(clang::driver::options::OPT_save_temps_EQ))
286     opts.SaveTempsDir = a->getValue();
287 
288   // -mrelocation-model option.
289   if (const llvm::opt::Arg *a =
290           args.getLastArg(clang::driver::options::OPT_mrelocation_model)) {
291     llvm::StringRef modelName = a->getValue();
292     auto relocModel =
293         llvm::StringSwitch<std::optional<llvm::Reloc::Model>>(modelName)
294             .Case("static", llvm::Reloc::Static)
295             .Case("pic", llvm::Reloc::PIC_)
296             .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
297             .Case("ropi", llvm::Reloc::ROPI)
298             .Case("rwpi", llvm::Reloc::RWPI)
299             .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
300             .Default(std::nullopt);
301     if (relocModel.has_value())
302       opts.setRelocationModel(*relocModel);
303     else
304       diags.Report(clang::diag::err_drv_invalid_value)
305           << a->getAsString(args) << modelName;
306   }
307 
308   // -pic-level and -pic-is-pie option.
309   if (int picLevel = getLastArgIntValue(
310           args, clang::driver::options::OPT_pic_level, 0, diags)) {
311     if (picLevel > 2)
312       diags.Report(clang::diag::err_drv_invalid_value)
313           << args.getLastArg(clang::driver::options::OPT_pic_level)
314                  ->getAsString(args)
315           << picLevel;
316 
317     opts.PICLevel = picLevel;
318     if (args.hasArg(clang::driver::options::OPT_pic_is_pie))
319       opts.IsPIE = 1;
320   }
321 
322   // This option is compatible with -f[no-]underscoring in gfortran.
323   if (args.hasFlag(clang::driver::options::OPT_fno_underscoring,
324                    clang::driver::options::OPT_funderscoring, false)) {
325     opts.Underscoring = 0;
326   }
327 }
328 
329 /// Parses all target input arguments and populates the target
330 /// options accordingly.
331 ///
332 /// \param [in] opts The target options instance to update
333 /// \param [in] args The list of input arguments (from the compiler invocation)
334 static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
335   if (const llvm::opt::Arg *a =
336           args.getLastArg(clang::driver::options::OPT_triple))
337     opts.triple = a->getValue();
338 
339   if (const llvm::opt::Arg *a =
340           args.getLastArg(clang::driver::options::OPT_target_cpu))
341     opts.cpu = a->getValue();
342 
343   for (const llvm::opt::Arg *currentArg :
344        args.filtered(clang::driver::options::OPT_target_feature))
345     opts.featuresAsWritten.emplace_back(currentArg->getValue());
346 }
347 
348 // Tweak the frontend configuration based on the frontend action
349 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
350   if (opts.programAction == DebugDumpParsingLog)
351     opts.instrumentedParse = true;
352 
353   if (opts.programAction == DebugDumpProvenance ||
354       opts.programAction == Fortran::frontend::GetDefinition)
355     opts.needProvenanceRangeToCharBlockMappings = true;
356 }
357 
358 /// Parse the argument specified for the -fconvert=<value> option
359 static std::optional<const char *> parseConvertArg(const char *s) {
360   return llvm::StringSwitch<std::optional<const char *>>(s)
361       .Case("unknown", "UNKNOWN")
362       .Case("native", "NATIVE")
363       .Case("little-endian", "LITTLE_ENDIAN")
364       .Case("big-endian", "BIG_ENDIAN")
365       .Case("swap", "SWAP")
366       .Default(std::nullopt);
367 }
368 
369 static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
370                               clang::DiagnosticsEngine &diags) {
371   unsigned numErrorsBefore = diags.getNumErrors();
372 
373   // By default the frontend driver creates a ParseSyntaxOnly action.
374   opts.programAction = ParseSyntaxOnly;
375 
376   // Treat multiple action options as an invocation error. Note that `clang
377   // -cc1` does accept multiple action options, but will only consider the
378   // rightmost one.
379   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
380     const unsigned diagID = diags.getCustomDiagID(
381         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
382     diags.Report(diagID);
383     return false;
384   }
385 
386   // Identify the action (i.e. opts.ProgramAction)
387   if (const llvm::opt::Arg *a =
388           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
389     switch (a->getOption().getID()) {
390     default: {
391       llvm_unreachable("Invalid option in group!");
392     }
393     case clang::driver::options::OPT_test_io:
394       opts.programAction = InputOutputTest;
395       break;
396     case clang::driver::options::OPT_E:
397       opts.programAction = PrintPreprocessedInput;
398       break;
399     case clang::driver::options::OPT_fsyntax_only:
400       opts.programAction = ParseSyntaxOnly;
401       break;
402     case clang::driver::options::OPT_emit_fir:
403       opts.programAction = EmitFIR;
404       break;
405     case clang::driver::options::OPT_emit_hlfir:
406       opts.programAction = EmitHLFIR;
407       break;
408     case clang::driver::options::OPT_emit_llvm:
409       opts.programAction = EmitLLVM;
410       break;
411     case clang::driver::options::OPT_emit_llvm_bc:
412       opts.programAction = EmitLLVMBitcode;
413       break;
414     case clang::driver::options::OPT_emit_obj:
415       opts.programAction = EmitObj;
416       break;
417     case clang::driver::options::OPT_S:
418       opts.programAction = EmitAssembly;
419       break;
420     case clang::driver::options::OPT_fdebug_unparse:
421       opts.programAction = DebugUnparse;
422       break;
423     case clang::driver::options::OPT_fdebug_unparse_no_sema:
424       opts.programAction = DebugUnparseNoSema;
425       break;
426     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
427       opts.programAction = DebugUnparseWithSymbols;
428       break;
429     case clang::driver::options::OPT_fdebug_dump_symbols:
430       opts.programAction = DebugDumpSymbols;
431       break;
432     case clang::driver::options::OPT_fdebug_dump_parse_tree:
433       opts.programAction = DebugDumpParseTree;
434       break;
435     case clang::driver::options::OPT_fdebug_dump_pft:
436       opts.programAction = DebugDumpPFT;
437       break;
438     case clang::driver::options::OPT_fdebug_dump_all:
439       opts.programAction = DebugDumpAll;
440       break;
441     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
442       opts.programAction = DebugDumpParseTreeNoSema;
443       break;
444     case clang::driver::options::OPT_fdebug_dump_provenance:
445       opts.programAction = DebugDumpProvenance;
446       break;
447     case clang::driver::options::OPT_fdebug_dump_parsing_log:
448       opts.programAction = DebugDumpParsingLog;
449       break;
450     case clang::driver::options::OPT_fdebug_measure_parse_tree:
451       opts.programAction = DebugMeasureParseTree;
452       break;
453     case clang::driver::options::OPT_fdebug_pre_fir_tree:
454       opts.programAction = DebugPreFIRTree;
455       break;
456     case clang::driver::options::OPT_fget_symbols_sources:
457       opts.programAction = GetSymbolsSources;
458       break;
459     case clang::driver::options::OPT_fget_definition:
460       opts.programAction = GetDefinition;
461       break;
462     case clang::driver::options::OPT_init_only:
463       opts.programAction = InitOnly;
464       break;
465 
466       // TODO:
467       // case clang::driver::options::OPT_emit_llvm:
468       // case clang::driver::options::OPT_emit_llvm_only:
469       // case clang::driver::options::OPT_emit_codegen_only:
470       // case clang::driver::options::OPT_emit_module:
471       // (...)
472     }
473 
474     // Parse the values provided with `-fget-definition` (there should be 3
475     // integers)
476     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
477         clang::driver::options::OPT_fget_definition) {
478       unsigned optVals[3] = {0, 0, 0};
479 
480       for (unsigned i = 0; i < 3; i++) {
481         llvm::StringRef val = a->getValue(i);
482 
483         if (val.getAsInteger(10, optVals[i])) {
484           // A non-integer was encountered - that's an error.
485           diags.Report(clang::diag::err_drv_invalid_value)
486               << a->getOption().getName() << val;
487           break;
488         }
489       }
490       opts.getDefVals.line = optVals[0];
491       opts.getDefVals.startColumn = optVals[1];
492       opts.getDefVals.endColumn = optVals[2];
493     }
494   }
495 
496   // Parsing -load <dsopath> option and storing shared object path
497   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
498     opts.plugins.push_back(a->getValue());
499   }
500 
501   // Parsing -plugin <name> option and storing plugin name and setting action
502   if (const llvm::opt::Arg *a =
503           args.getLastArg(clang::driver::options::OPT_plugin)) {
504     opts.programAction = PluginAction;
505     opts.actionName = a->getValue();
506   }
507 
508   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
509   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
510   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
511 
512   // Get the input kind (from the value passed via `-x`)
513   InputKind dashX(Language::Unknown);
514   if (const llvm::opt::Arg *a =
515           args.getLastArg(clang::driver::options::OPT_x)) {
516     llvm::StringRef xValue = a->getValue();
517     // Principal languages.
518     dashX = llvm::StringSwitch<InputKind>(xValue)
519                 // Flang does not differentiate between pre-processed and not
520                 // pre-processed inputs.
521                 .Case("f95", Language::Fortran)
522                 .Case("f95-cpp-input", Language::Fortran)
523                 .Default(Language::Unknown);
524 
525     // Flang's intermediate representations.
526     if (dashX.isUnknown())
527       dashX = llvm::StringSwitch<InputKind>(xValue)
528                   .Case("ir", Language::LLVM_IR)
529                   .Case("fir", Language::MLIR)
530                   .Case("mlir", Language::MLIR)
531                   .Default(Language::Unknown);
532 
533     if (dashX.isUnknown())
534       diags.Report(clang::diag::err_drv_invalid_value)
535           << a->getAsString(args) << a->getValue();
536   }
537 
538   // Collect the input files and save them in our instance of FrontendOptions.
539   std::vector<std::string> inputs =
540       args.getAllArgValues(clang::driver::options::OPT_INPUT);
541   opts.inputs.clear();
542   if (inputs.empty())
543     // '-' is the default input if none is given.
544     inputs.push_back("-");
545   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
546     InputKind ik = dashX;
547     if (ik.isUnknown()) {
548       ik = FrontendOptions::getInputKindForExtension(
549           llvm::StringRef(inputs[i]).rsplit('.').second);
550       if (ik.isUnknown())
551         ik = Language::Unknown;
552       if (i == 0)
553         dashX = ik;
554     }
555 
556     opts.inputs.emplace_back(std::move(inputs[i]), ik);
557   }
558 
559   // Set fortranForm based on options -ffree-form and -ffixed-form.
560   if (const auto *arg =
561           args.getLastArg(clang::driver::options::OPT_ffixed_form,
562                           clang::driver::options::OPT_ffree_form)) {
563     opts.fortranForm =
564         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
565             ? FortranForm::FixedForm
566             : FortranForm::FreeForm;
567   }
568 
569   // Set fixedFormColumns based on -ffixed-line-length=<value>
570   if (const auto *arg =
571           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
572     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
573     std::int64_t columns = -1;
574     if (argValue == "none") {
575       columns = 0;
576     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
577       columns = -1;
578     }
579     if (columns < 0) {
580       diags.Report(clang::diag::err_drv_negative_columns)
581           << arg->getOption().getName() << arg->getValue();
582     } else if (columns == 0) {
583       opts.fixedFormColumns = 1000000;
584     } else if (columns < 7) {
585       diags.Report(clang::diag::err_drv_small_columns)
586           << arg->getOption().getName() << arg->getValue() << "7";
587     } else {
588       opts.fixedFormColumns = columns;
589     }
590   }
591 
592   // Set conversion based on -fconvert=<value>
593   if (const auto *arg =
594           args.getLastArg(clang::driver::options::OPT_fconvert_EQ)) {
595     const char *argValue = arg->getValue();
596     if (auto convert = parseConvertArg(argValue))
597       opts.envDefaults.push_back({"FORT_CONVERT", *convert});
598     else
599       diags.Report(clang::diag::err_drv_invalid_value)
600           << arg->getAsString(args) << argValue;
601   }
602 
603   // -f{no-}implicit-none
604   opts.features.Enable(
605       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
606       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
607                    clang::driver::options::OPT_fno_implicit_none, false));
608 
609   // -f{no-}backslash
610   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
611                        args.hasFlag(clang::driver::options::OPT_fbackslash,
612                                     clang::driver::options::OPT_fno_backslash,
613                                     false));
614 
615   // -f{no-}logical-abbreviations
616   opts.features.Enable(
617       Fortran::common::LanguageFeature::LogicalAbbreviations,
618       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
619                    clang::driver::options::OPT_fno_logical_abbreviations,
620                    false));
621 
622   // -f{no-}xor-operator
623   opts.features.Enable(
624       Fortran::common::LanguageFeature::XOROperator,
625       args.hasFlag(clang::driver::options::OPT_fxor_operator,
626                    clang::driver::options::OPT_fno_xor_operator, false));
627 
628   // -fno-automatic
629   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
630     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
631   }
632 
633   if (args.hasArg(
634           clang::driver::options::OPT_falternative_parameter_statement)) {
635     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
636   }
637   if (const llvm::opt::Arg *arg =
638           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
639     llvm::StringRef argValue = arg->getValue();
640     if (argValue == "utf-8") {
641       opts.encoding = Fortran::parser::Encoding::UTF_8;
642     } else if (argValue == "latin-1") {
643       opts.encoding = Fortran::parser::Encoding::LATIN_1;
644     } else {
645       diags.Report(clang::diag::err_drv_invalid_value)
646           << arg->getAsString(args) << argValue;
647     }
648   }
649 
650   setUpFrontendBasedOnAction(opts);
651   opts.dashX = dashX;
652 
653   return diags.getNumErrors() == numErrorsBefore;
654 }
655 
656 // Generate the path to look for intrinsic modules
657 static std::string getIntrinsicDir() {
658   // TODO: Find a system independent API
659   llvm::SmallString<128> driverPath;
660   driverPath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
661   llvm::sys::path::remove_filename(driverPath);
662   driverPath.append("/../include/flang/");
663   return std::string(driverPath);
664 }
665 
666 // Generate the path to look for OpenMP headers
667 static std::string getOpenMPHeadersDir() {
668   llvm::SmallString<128> includePath;
669   includePath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
670   llvm::sys::path::remove_filename(includePath);
671   includePath.append("/../include/flang/OpenMP/");
672   return std::string(includePath);
673 }
674 
675 /// Parses all preprocessor input arguments and populates the preprocessor
676 /// options accordingly.
677 ///
678 /// \param [in] opts The preprocessor options instance
679 /// \param [out] args The list of input arguments
680 static void parsePreprocessorArgs(Fortran::frontend::PreprocessorOptions &opts,
681                                   llvm::opt::ArgList &args) {
682   // Add macros from the command line.
683   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_D,
684                                               clang::driver::options::OPT_U)) {
685     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
686       opts.addMacroDef(currentArg->getValue());
687     } else {
688       opts.addMacroUndef(currentArg->getValue());
689     }
690   }
691 
692   // Add the ordered list of -I's.
693   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
694     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
695 
696   // Prepend the ordered list of -intrinsic-modules-path
697   // to the default location to search.
698   for (const auto *currentArg :
699        args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
700     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
701 
702   // -cpp/-nocpp
703   if (const auto *currentArg = args.getLastArg(
704           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
705     opts.macrosFlag =
706         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
707             ? PPMacrosFlag::Include
708             : PPMacrosFlag::Exclude;
709 
710   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
711   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
712 }
713 
714 /// Parses all semantic related arguments and populates the variables
715 /// options accordingly. Returns false if new errors are generated.
716 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
717                           clang::DiagnosticsEngine &diags) {
718   unsigned numErrorsBefore = diags.getNumErrors();
719 
720   // -J/module-dir option
721   auto moduleDirList =
722       args.getAllArgValues(clang::driver::options::OPT_module_dir);
723   // User can only specify -J/-module-dir once
724   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
725   if (moduleDirList.size() > 1) {
726     const unsigned diagID =
727         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
728                               "Only one '-module-dir/-J' option allowed");
729     diags.Report(diagID);
730   }
731   if (moduleDirList.size() == 1)
732     res.setModuleDir(moduleDirList[0]);
733 
734   // -fdebug-module-writer option
735   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
736     res.setDebugModuleDir(true);
737   }
738 
739   // -module-suffix
740   if (const auto *moduleSuffix =
741           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
742     res.setModuleFileSuffix(moduleSuffix->getValue());
743   }
744 
745   // -f{no-}analyzed-objects-for-unparse
746   res.setUseAnalyzedObjectsForUnparse(args.hasFlag(
747       clang::driver::options::OPT_fanalyzed_objects_for_unparse,
748       clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
749 
750   return diags.getNumErrors() == numErrorsBefore;
751 }
752 
753 /// Parses all diagnostics related arguments and populates the variables
754 /// options accordingly. Returns false if new errors are generated.
755 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
756                           clang::DiagnosticsEngine &diags) {
757   unsigned numErrorsBefore = diags.getNumErrors();
758 
759   // -Werror option
760   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
761   // this has to change when other -W<opt>'s are supported.
762   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
763     const auto &wArgs =
764         args.getAllArgValues(clang::driver::options::OPT_W_Joined);
765     for (const auto &wArg : wArgs) {
766       if (wArg == "error") {
767         res.setWarnAsErr(true);
768       } else {
769         const unsigned diagID =
770             diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
771                                   "Only `-Werror` is supported currently.");
772         diags.Report(diagID);
773       }
774     }
775   }
776 
777   // Default to off for `flang-new -fc1`.
778   res.getFrontendOpts().showColors =
779       parseShowColorsArgs(args, /*defaultDiagColor=*/false);
780 
781   // Honor color diagnostics.
782   res.getDiagnosticOpts().ShowColors = res.getFrontendOpts().showColors;
783 
784   return diags.getNumErrors() == numErrorsBefore;
785 }
786 
787 /// Parses all Dialect related arguments and populates the variables
788 /// options accordingly. Returns false if new errors are generated.
789 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
790                              clang::DiagnosticsEngine &diags) {
791   unsigned numErrorsBefore = diags.getNumErrors();
792 
793   // -fdefault* family
794   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
795     res.getDefaultKinds().set_defaultRealKind(8);
796     res.getDefaultKinds().set_doublePrecisionKind(16);
797   }
798   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
799     res.getDefaultKinds().set_defaultIntegerKind(8);
800     res.getDefaultKinds().set_subscriptIntegerKind(8);
801     res.getDefaultKinds().set_sizeIntegerKind(8);
802     res.getDefaultKinds().set_defaultLogicalKind(8);
803   }
804   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
805     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
806       // -fdefault-double-8 has to be used with -fdefault-real-8
807       // to be compatible with gfortran
808       const unsigned diagID = diags.getCustomDiagID(
809           clang::DiagnosticsEngine::Error,
810           "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
811       diags.Report(diagID);
812     }
813     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
814     res.getDefaultKinds().set_doublePrecisionKind(8);
815   }
816   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
817     res.getDefaultKinds().set_sizeIntegerKind(8);
818 
819   // -fopenmp and -fopenacc
820   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
821     res.getFrontendOpts().features.Enable(
822         Fortran::common::LanguageFeature::OpenACC);
823   }
824   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
825     // By default OpenMP is set to 1.1 version
826     res.getLangOpts().OpenMPVersion = 11;
827     res.getFrontendOpts().features.Enable(
828         Fortran::common::LanguageFeature::OpenMP);
829     if (int Version = getLastArgIntValue(
830             args, clang::driver::options::OPT_fopenmp_version_EQ,
831             res.getLangOpts().OpenMPVersion, diags)) {
832       res.getLangOpts().OpenMPVersion = Version;
833     }
834     if (args.hasArg(clang::driver::options::OPT_fopenmp_is_target_device)) {
835       res.getLangOpts().OpenMPIsTargetDevice = 1;
836 
837       // Get OpenMP host file path if any and report if a non existent file is
838       // found
839       if (auto *arg = args.getLastArg(
840               clang::driver::options::OPT_fopenmp_host_ir_file_path)) {
841         res.getLangOpts().OMPHostIRFile = arg->getValue();
842         if (!llvm::sys::fs::exists(res.getLangOpts().OMPHostIRFile))
843           diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
844               << res.getLangOpts().OMPHostIRFile;
845       }
846 
847       if (args.hasFlag(
848               clang::driver::options::OPT_fopenmp_assume_teams_oversubscription,
849               clang::driver::options::
850                   OPT_fno_openmp_assume_teams_oversubscription,
851               /*Default=*/false))
852         res.getLangOpts().OpenMPTeamSubscription = true;
853 
854       if (args.hasArg(
855               clang::driver::options::OPT_fopenmp_assume_no_thread_state))
856         res.getLangOpts().OpenMPNoThreadState = 1;
857 
858       if (args.hasArg(
859               clang::driver::options::OPT_fopenmp_assume_no_nested_parallelism))
860         res.getLangOpts().OpenMPNoNestedParallelism = 1;
861 
862       if (args.hasFlag(clang::driver::options::
863                            OPT_fopenmp_assume_threads_oversubscription,
864                        clang::driver::options::
865                            OPT_fno_openmp_assume_threads_oversubscription,
866                        /*Default=*/false))
867         res.getLangOpts().OpenMPThreadSubscription = true;
868 
869       if ((args.hasArg(clang::driver::options::OPT_fopenmp_target_debug) ||
870            args.hasArg(clang::driver::options::OPT_fopenmp_target_debug_EQ))) {
871         res.getLangOpts().OpenMPTargetDebug = getLastArgIntValue(
872             args, clang::driver::options::OPT_fopenmp_target_debug_EQ,
873             res.getLangOpts().OpenMPTargetDebug, diags);
874 
875         if (!res.getLangOpts().OpenMPTargetDebug &&
876             args.hasArg(clang::driver::options::OPT_fopenmp_target_debug))
877           res.getLangOpts().OpenMPTargetDebug = 1;
878       }
879     }
880 
881     switch (llvm::Triple(res.getTargetOpts().triple).getArch()) {
882     case llvm::Triple::nvptx:
883     case llvm::Triple::nvptx64:
884     case llvm::Triple::amdgcn:
885       if (!res.getLangOpts().OpenMPIsTargetDevice) {
886         const unsigned diagID = diags.getCustomDiagID(
887             clang::DiagnosticsEngine::Error,
888             "OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
889         diags.Report(diagID);
890       }
891       res.getLangOpts().OpenMPIsGPU = 1;
892       break;
893     default:
894       res.getLangOpts().OpenMPIsGPU = 0;
895       break;
896     }
897   }
898 
899   // -pedantic
900   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
901     res.setEnableConformanceChecks();
902     res.setEnableUsageChecks();
903   }
904   // -std=f2018
905   // TODO: Set proper options when more fortran standards
906   // are supported.
907   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
908     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
909     // We only allow f2018 as the given standard
910     if (standard.equals("f2018")) {
911       res.setEnableConformanceChecks();
912     } else {
913       const unsigned diagID =
914           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
915                                 "Only -std=f2018 is allowed currently.");
916       diags.Report(diagID);
917     }
918   }
919   return diags.getNumErrors() == numErrorsBefore;
920 }
921 
922 /// Parses all floating point related arguments and populates the
923 /// CompilerInvocation accordingly.
924 /// Returns false if new errors are generated.
925 ///
926 /// \param [out] invoc Stores the processed arguments
927 /// \param [in] args The compiler invocation arguments to parse
928 /// \param [out] diags DiagnosticsEngine to report erros with
929 static bool parseFloatingPointArgs(CompilerInvocation &invoc,
930                                    llvm::opt::ArgList &args,
931                                    clang::DiagnosticsEngine &diags) {
932   LangOptions &opts = invoc.getLangOpts();
933 
934   if (const llvm::opt::Arg *a =
935           args.getLastArg(clang::driver::options::OPT_ffp_contract)) {
936     const llvm::StringRef val = a->getValue();
937     enum LangOptions::FPModeKind fpContractMode;
938 
939     if (val == "off")
940       fpContractMode = LangOptions::FPM_Off;
941     else if (val == "fast")
942       fpContractMode = LangOptions::FPM_Fast;
943     else {
944       diags.Report(clang::diag::err_drv_unsupported_option_argument)
945           << a->getSpelling() << val;
946       return false;
947     }
948 
949     opts.setFPContractMode(fpContractMode);
950   }
951 
952   if (args.getLastArg(clang::driver::options::OPT_menable_no_infinities)) {
953     opts.NoHonorInfs = true;
954   }
955 
956   if (args.getLastArg(clang::driver::options::OPT_menable_no_nans)) {
957     opts.NoHonorNaNs = true;
958   }
959 
960   if (args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
961     opts.ApproxFunc = true;
962   }
963 
964   if (args.getLastArg(clang::driver::options::OPT_fno_signed_zeros)) {
965     opts.NoSignedZeros = true;
966   }
967 
968   if (args.getLastArg(clang::driver::options::OPT_mreassociate)) {
969     opts.AssociativeMath = true;
970   }
971 
972   if (args.getLastArg(clang::driver::options::OPT_freciprocal_math)) {
973     opts.ReciprocalMath = true;
974   }
975 
976   if (args.getLastArg(clang::driver::options::OPT_ffast_math)) {
977     opts.NoHonorInfs = true;
978     opts.NoHonorNaNs = true;
979     opts.AssociativeMath = true;
980     opts.ReciprocalMath = true;
981     opts.ApproxFunc = true;
982     opts.NoSignedZeros = true;
983     opts.setFPContractMode(LangOptions::FPM_Fast);
984   }
985 
986   return true;
987 }
988 
989 bool CompilerInvocation::createFromArgs(
990     CompilerInvocation &res, llvm::ArrayRef<const char *> commandLineArgs,
991     clang::DiagnosticsEngine &diags, const char *argv0) {
992 
993   bool success = true;
994 
995   // Set the default triple for this CompilerInvocation. This might be
996   // overridden by users with `-triple` (see the call to `ParseTargetArgs`
997   // below).
998   // NOTE: Like in Clang, it would be nice to use option marshalling
999   // for this so that the entire logic for setting-up the triple is in one
1000   // place.
1001   res.getTargetOpts().triple =
1002       llvm::Triple::normalize(llvm::sys::getDefaultTargetTriple());
1003 
1004   // Parse the arguments
1005   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
1006   llvm::opt::Visibility visibilityMask(clang::driver::options::FC1Option);
1007   unsigned missingArgIndex, missingArgCount;
1008   llvm::opt::InputArgList args = opts.ParseArgs(
1009       commandLineArgs, missingArgIndex, missingArgCount, visibilityMask);
1010 
1011   // Check for missing argument error.
1012   if (missingArgCount) {
1013     diags.Report(clang::diag::err_drv_missing_argument)
1014         << args.getArgString(missingArgIndex) << missingArgCount;
1015     success = false;
1016   }
1017 
1018   // Issue errors on unknown arguments
1019   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
1020     auto argString = a->getAsString(args);
1021     std::string nearest;
1022     if (opts.findNearest(argString, nearest, visibilityMask) > 1)
1023       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
1024     else
1025       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
1026           << argString << nearest;
1027     success = false;
1028   }
1029 
1030   // -flang-experimental-hlfir
1031   if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir) ||
1032       args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1033     res.loweringOpts.setLowerToHighLevelFIR(true);
1034   }
1035 
1036   if (args.hasArg(clang::driver::options::OPT_flang_experimental_polymorphism)) {
1037     res.loweringOpts.setPolymorphicTypeImpl(true);
1038   }
1039 
1040   // -fno-ppc-native-vector-element-order
1041   if (args.hasArg(clang::driver::options::OPT_fno_ppc_native_vec_elem_order)) {
1042     res.loweringOpts.setNoPPCNativeVecElemOrder(true);
1043   }
1044 
1045   // Preserve all the remark options requested, i.e. -Rpass, -Rpass-missed or
1046   // -Rpass-analysis. This will be used later when processing and outputting the
1047   // remarks generated by LLVM in ExecuteCompilerInvocation.cpp.
1048   for (auto *a : args.filtered(clang::driver::options::OPT_R_Group)) {
1049     if (a->getOption().matches(clang::driver::options::OPT_R_value_Group))
1050       // This is -Rfoo=, where foo is the name of the diagnostic
1051       // group. Add only the remark option name to the diagnostics. e.g. for
1052       // -Rpass= we will add the string "pass".
1053       res.getDiagnosticOpts().Remarks.push_back(
1054           std::string(a->getOption().getName().drop_front(1).rtrim("=-")));
1055     else
1056       // If no regex was provided, add the provided value, e.g. for -Rpass add
1057       // the string "pass".
1058       res.getDiagnosticOpts().Remarks.push_back(a->getValue());
1059   }
1060 
1061   success &= parseFrontendArgs(res.getFrontendOpts(), args, diags);
1062   parseTargetArgs(res.getTargetOpts(), args);
1063   parsePreprocessorArgs(res.getPreprocessorOpts(), args);
1064   parseCodeGenArgs(res.getCodeGenOpts(), args, diags);
1065   success &= parseDebugArgs(res.getCodeGenOpts(), args, diags);
1066   success &= parseSemaArgs(res, args, diags);
1067   success &= parseDialectArgs(res, args, diags);
1068   success &= parseDiagArgs(res, args, diags);
1069 
1070   // Collect LLVM (-mllvm) and MLIR (-mmlir) options.
1071   // NOTE: Try to avoid adding any options directly to `llvmArgs` or
1072   // `mlirArgs`. Instead, you can use
1073   //    * `-mllvm <your-llvm-option>`, or
1074   //    * `-mmlir <your-mlir-option>`.
1075   res.frontendOpts.llvmArgs =
1076       args.getAllArgValues(clang::driver::options::OPT_mllvm);
1077   res.frontendOpts.mlirArgs =
1078       args.getAllArgValues(clang::driver::options::OPT_mmlir);
1079 
1080   success &= parseFloatingPointArgs(res, args, diags);
1081 
1082   // Set the string to be used as the return value of the COMPILER_OPTIONS
1083   // intrinsic of iso_fortran_env. This is either passed in from the parent
1084   // compiler driver invocation with an environment variable, or failing that
1085   // set to the command line arguments of the frontend driver invocation.
1086   res.allCompilerInvocOpts = std::string();
1087   llvm::raw_string_ostream os(res.allCompilerInvocOpts);
1088   char *compilerOptsEnv = std::getenv("FLANG_COMPILER_OPTIONS_STRING");
1089   if (compilerOptsEnv != nullptr) {
1090     os << compilerOptsEnv;
1091   } else {
1092     os << argv0 << ' ';
1093     for (auto it = commandLineArgs.begin(), e = commandLineArgs.end(); it != e;
1094          ++it) {
1095       os << ' ' << *it;
1096     }
1097   }
1098 
1099   return success;
1100 }
1101 
1102 void CompilerInvocation::collectMacroDefinitions() {
1103   auto &ppOpts = this->getPreprocessorOpts();
1104 
1105   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
1106     llvm::StringRef macro = ppOpts.macros[i].first;
1107     bool isUndef = ppOpts.macros[i].second;
1108 
1109     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
1110     llvm::StringRef macroName = macroPair.first;
1111     llvm::StringRef macroBody = macroPair.second;
1112 
1113     // For an #undef'd macro, we only care about the name.
1114     if (isUndef) {
1115       parserOpts.predefinitions.emplace_back(macroName.str(),
1116                                              std::optional<std::string>{});
1117       continue;
1118     }
1119 
1120     // For a #define'd macro, figure out the actual definition.
1121     if (macroName.size() == macro.size())
1122       macroBody = "1";
1123     else {
1124       // Note: GCC drops anything following an end-of-line character.
1125       llvm::StringRef::size_type end = macroBody.find_first_of("\n\r");
1126       macroBody = macroBody.substr(0, end);
1127     }
1128     parserOpts.predefinitions.emplace_back(
1129         macroName, std::optional<std::string>(macroBody.str()));
1130   }
1131 }
1132 
1133 void CompilerInvocation::setDefaultFortranOpts() {
1134   auto &fortranOptions = getFortranOpts();
1135 
1136   std::vector<std::string> searchDirectories{"."s};
1137   fortranOptions.searchDirectories = searchDirectories;
1138 
1139   // Add the location of omp_lib.h to the search directories. Currently this is
1140   // identical to the modules' directory.
1141   fortranOptions.searchDirectories.emplace_back(getOpenMPHeadersDir());
1142 
1143   fortranOptions.isFixedForm = false;
1144 }
1145 
1146 // TODO: When expanding this method, consider creating a dedicated API for
1147 // this. Also at some point we will need to differentiate between different
1148 // targets and add dedicated predefines for each.
1149 void CompilerInvocation::setDefaultPredefinitions() {
1150   auto &fortranOptions = getFortranOpts();
1151   const auto &frontendOptions = getFrontendOpts();
1152   // Populate the macro list with version numbers and other predefinitions.
1153   fortranOptions.predefinitions.emplace_back("__flang__", "1");
1154   fortranOptions.predefinitions.emplace_back("__flang_major__",
1155                                              FLANG_VERSION_MAJOR_STRING);
1156   fortranOptions.predefinitions.emplace_back("__flang_minor__",
1157                                              FLANG_VERSION_MINOR_STRING);
1158   fortranOptions.predefinitions.emplace_back("__flang_patchlevel__",
1159                                              FLANG_VERSION_PATCHLEVEL_STRING);
1160 
1161   // Add predefinitions based on extensions enabled
1162   if (frontendOptions.features.IsEnabled(
1163           Fortran::common::LanguageFeature::OpenACC)) {
1164     fortranOptions.predefinitions.emplace_back("_OPENACC", "202211");
1165   }
1166   if (frontendOptions.features.IsEnabled(
1167           Fortran::common::LanguageFeature::OpenMP)) {
1168     Fortran::common::setOpenMPMacro(getLangOpts().OpenMPVersion,
1169                                     fortranOptions.predefinitions);
1170   }
1171   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1172   if (targetTriple.getArch() == llvm::Triple::ArchType::x86_64) {
1173     fortranOptions.predefinitions.emplace_back("__x86_64__", "1");
1174     fortranOptions.predefinitions.emplace_back("__x86_64", "1");
1175   }
1176 }
1177 
1178 void CompilerInvocation::setFortranOpts() {
1179   auto &fortranOptions = getFortranOpts();
1180   const auto &frontendOptions = getFrontendOpts();
1181   const auto &preprocessorOptions = getPreprocessorOpts();
1182   auto &moduleDirJ = getModuleDir();
1183 
1184   if (frontendOptions.fortranForm != FortranForm::Unknown) {
1185     fortranOptions.isFixedForm =
1186         frontendOptions.fortranForm == FortranForm::FixedForm;
1187   }
1188   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
1189 
1190   fortranOptions.features = frontendOptions.features;
1191   fortranOptions.encoding = frontendOptions.encoding;
1192 
1193   // Adding search directories specified by -I
1194   fortranOptions.searchDirectories.insert(
1195       fortranOptions.searchDirectories.end(),
1196       preprocessorOptions.searchDirectoriesFromDashI.begin(),
1197       preprocessorOptions.searchDirectoriesFromDashI.end());
1198 
1199   // Add the ordered list of -intrinsic-modules-path
1200   fortranOptions.searchDirectories.insert(
1201       fortranOptions.searchDirectories.end(),
1202       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
1203       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
1204 
1205   //  Add the default intrinsic module directory
1206   fortranOptions.intrinsicModuleDirectories.emplace_back(getIntrinsicDir());
1207 
1208   // Add the directory supplied through -J/-module-dir to the list of search
1209   // directories
1210   if (moduleDirJ != ".")
1211     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
1212 
1213   if (frontendOptions.instrumentedParse)
1214     fortranOptions.instrumentedParse = true;
1215 
1216   if (frontendOptions.showColors)
1217     fortranOptions.showColors = true;
1218 
1219   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
1220     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
1221 
1222   if (getEnableConformanceChecks())
1223     fortranOptions.features.WarnOnAllNonstandard();
1224 
1225   if (getEnableUsageChecks())
1226     fortranOptions.features.WarnOnAllUsage();
1227 }
1228 
1229 void CompilerInvocation::setSemanticsOpts(
1230     Fortran::parser::AllCookedSources &allCookedSources) {
1231   auto &fortranOptions = getFortranOpts();
1232 
1233   semanticsContext = std::make_unique<semantics::SemanticsContext>(
1234       getDefaultKinds(), fortranOptions.features, allCookedSources);
1235 
1236   semanticsContext->set_moduleDirectory(getModuleDir())
1237       .set_searchDirectories(fortranOptions.searchDirectories)
1238       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
1239       .set_warningsAreErrors(getWarnAsErr())
1240       .set_moduleFileSuffix(getModuleFileSuffix())
1241       .set_underscoring(getCodeGenOpts().Underscoring);
1242 
1243   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1244   // FIXME: Handle real(3) ?
1245   if (targetTriple.getArch() != llvm::Triple::ArchType::x86_64) {
1246     semanticsContext->targetCharacteristics().DisableType(
1247         Fortran::common::TypeCategory::Real, /*kind=*/10);
1248   }
1249 
1250   std::string version = Fortran::common::getFlangFullVersion();
1251   semanticsContext->targetCharacteristics()
1252       .set_compilerOptionsString(allCompilerInvocOpts)
1253       .set_compilerVersionString(version);
1254 
1255   if (targetTriple.isPPC())
1256     semanticsContext->targetCharacteristics().set_isPPC(true);
1257 }
1258 
1259 /// Set \p loweringOptions controlling lowering behavior based
1260 /// on the \p optimizationLevel.
1261 void CompilerInvocation::setLoweringOptions() {
1262   const CodeGenOptions &codegenOpts = getCodeGenOpts();
1263 
1264   // Lower TRANSPOSE as a runtime call under -O0.
1265   loweringOpts.setOptimizeTranspose(codegenOpts.OptimizationLevel > 0);
1266   loweringOpts.setUnderscoring(codegenOpts.Underscoring);
1267 
1268   const LangOptions &langOptions = getLangOpts();
1269   Fortran::common::MathOptionsBase &mathOpts = loweringOpts.getMathOptions();
1270   // TODO: when LangOptions are finalized, we can represent
1271   //       the math related options using Fortran::commmon::MathOptionsBase,
1272   //       so that we can just copy it into LoweringOptions.
1273   mathOpts
1274       .setFPContractEnabled(langOptions.getFPContractMode() ==
1275                             LangOptions::FPM_Fast)
1276       .setNoHonorInfs(langOptions.NoHonorInfs)
1277       .setNoHonorNaNs(langOptions.NoHonorNaNs)
1278       .setApproxFunc(langOptions.ApproxFunc)
1279       .setNoSignedZeros(langOptions.NoSignedZeros)
1280       .setAssociativeMath(langOptions.AssociativeMath)
1281       .setReciprocalMath(langOptions.ReciprocalMath);
1282 }
1283