xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 6b8d659062a0f9a7daa641432701dc6996939dc5) 
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 = 0;
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 0;
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 static bool parseVectorLibArg(Fortran::frontend::CodeGenOptions &opts,
157                               llvm::opt::ArgList &args,
158                               clang::DiagnosticsEngine &diags) {
159   llvm::opt::Arg *arg = args.getLastArg(clang::driver::options::OPT_fveclib);
160   if (!arg)
161     return true;
162 
163   using VectorLibrary = llvm::driver::VectorLibrary;
164   std::optional<VectorLibrary> val =
165       llvm::StringSwitch<std::optional<VectorLibrary>>(arg->getValue())
166           .Case("Accelerate", VectorLibrary::Accelerate)
167           .Case("LIBMVEC", VectorLibrary::LIBMVEC)
168           .Case("MASSV", VectorLibrary::MASSV)
169           .Case("SVML", VectorLibrary::SVML)
170           .Case("SLEEF", VectorLibrary::SLEEF)
171           .Case("Darwin_libsystem_m", VectorLibrary::Darwin_libsystem_m)
172           .Case("ArmPL", VectorLibrary::ArmPL)
173           .Case("NoLibrary", VectorLibrary::NoLibrary)
174           .Default(std::nullopt);
175   if (!val.has_value()) {
176     diags.Report(clang::diag::err_drv_invalid_value)
177         << arg->getAsString(args) << arg->getValue();
178     return false;
179   }
180   opts.setVecLib(val.value());
181   return true;
182 }
183 
184 // Generate an OptRemark object containing info on if the -Rgroup
185 // specified is enabled or not.
186 static CodeGenOptions::OptRemark
187 parseOptimizationRemark(clang::DiagnosticsEngine &diags,
188                         llvm::opt::ArgList &args, llvm::opt::OptSpecifier optEq,
189                         llvm::StringRef remarkOptName) {
190   assert((remarkOptName == "pass" || remarkOptName == "pass-missed" ||
191           remarkOptName == "pass-analysis") &&
192          "Unsupported remark option name provided.");
193   CodeGenOptions::OptRemark result;
194 
195   for (llvm::opt::Arg *a : args) {
196     if (a->getOption().matches(clang::driver::options::OPT_R_Joined)) {
197       llvm::StringRef value = a->getValue();
198 
199       if (value == remarkOptName) {
200         result.Kind = CodeGenOptions::RemarkKind::RK_Enabled;
201         // Enable everything
202         result.Pattern = ".*";
203         result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
204 
205       } else if (value.split('-') ==
206                  std::make_pair(llvm::StringRef("no"), remarkOptName)) {
207         result.Kind = CodeGenOptions::RemarkKind::RK_Disabled;
208         // Disable everything
209         result.Pattern = "";
210         result.Regex = nullptr;
211       }
212     } else if (a->getOption().matches(optEq)) {
213       result.Kind = CodeGenOptions::RemarkKind::RK_WithPattern;
214       result.Pattern = a->getValue();
215       result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
216       std::string regexError;
217 
218       if (!result.Regex->isValid(regexError)) {
219         diags.Report(clang::diag::err_drv_optimization_remark_pattern)
220             << regexError << a->getAsString(args);
221         return CodeGenOptions::OptRemark();
222       }
223     }
224   }
225   return result;
226 }
227 
228 static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
229                              llvm::opt::ArgList &args,
230                              clang::DiagnosticsEngine &diags) {
231   opts.OptimizationLevel = getOptimizationLevel(args, diags);
232 
233   if (args.hasFlag(clang::driver::options::OPT_fdebug_pass_manager,
234                    clang::driver::options::OPT_fno_debug_pass_manager, false))
235     opts.DebugPassManager = 1;
236 
237   if (args.hasFlag(clang::driver::options::OPT_fstack_arrays,
238                    clang::driver::options::OPT_fno_stack_arrays, false))
239     opts.StackArrays = 1;
240 
241   if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
242                    clang::driver::options::OPT_fno_loop_versioning, false))
243     opts.LoopVersioning = 1;
244 
245   opts.AliasAnalysis = opts.OptimizationLevel > 0;
246 
247   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
248     opts.LLVMPassPlugins.push_back(a->getValue());
249 
250   // -fembed-offload-object option
251   for (auto *a :
252        args.filtered(clang::driver::options::OPT_fembed_offload_object_EQ))
253     opts.OffloadObjects.push_back(a->getValue());
254 
255   // -flto=full/thin option.
256   if (const llvm::opt::Arg *a =
257           args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
258     llvm::StringRef s = a->getValue();
259     assert((s == "full" || s == "thin") && "Unknown LTO mode.");
260     if (s == "full")
261       opts.PrepareForFullLTO = true;
262     else
263       opts.PrepareForThinLTO = true;
264   }
265 
266   if (const llvm::opt::Arg *a = args.getLastArg(
267           clang::driver::options::OPT_mcode_object_version_EQ)) {
268     llvm::StringRef s = a->getValue();
269     if (s == "5")
270       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_5;
271     if (s == "4")
272       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_4;
273     if (s == "none")
274       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_None;
275   }
276 
277   // -f[no-]save-optimization-record[=<format>]
278   if (const llvm::opt::Arg *a =
279           args.getLastArg(clang::driver::options::OPT_opt_record_file))
280     opts.OptRecordFile = a->getValue();
281 
282   // Optimization file format. Defaults to yaml
283   if (const llvm::opt::Arg *a =
284           args.getLastArg(clang::driver::options::OPT_opt_record_format))
285     opts.OptRecordFormat = a->getValue();
286 
287   // Specifies, using a regex, which successful optimization passes(middle and
288   // backend), to include in the final optimization record file generated. If
289   // not provided -fsave-optimization-record will include all passes.
290   if (const llvm::opt::Arg *a =
291           args.getLastArg(clang::driver::options::OPT_opt_record_passes))
292     opts.OptRecordPasses = a->getValue();
293 
294   // Create OptRemark that allows printing of all successful optimization
295   // passes applied.
296   opts.OptimizationRemark =
297       parseOptimizationRemark(diags, args, clang::driver::options::OPT_Rpass_EQ,
298                               /*remarkOptName=*/"pass");
299 
300   // Create OptRemark that allows all missed optimization passes to be printed.
301   opts.OptimizationRemarkMissed = parseOptimizationRemark(
302       diags, args, clang::driver::options::OPT_Rpass_missed_EQ,
303       /*remarkOptName=*/"pass-missed");
304 
305   // Create OptRemark that allows all optimization decisions made by LLVM
306   // to be printed.
307   opts.OptimizationRemarkAnalysis = parseOptimizationRemark(
308       diags, args, clang::driver::options::OPT_Rpass_analysis_EQ,
309       /*remarkOptName=*/"pass-analysis");
310 
311   if (opts.getDebugInfo() == llvm::codegenoptions::NoDebugInfo) {
312     // If the user requested a flag that requires source locations available in
313     // the backend, make sure that the backend tracks source location
314     // information.
315     bool needLocTracking = !opts.OptRecordFile.empty() ||
316                            !opts.OptRecordPasses.empty() ||
317                            !opts.OptRecordFormat.empty() ||
318                            opts.OptimizationRemark.hasValidPattern() ||
319                            opts.OptimizationRemarkMissed.hasValidPattern() ||
320                            opts.OptimizationRemarkAnalysis.hasValidPattern();
321 
322     if (needLocTracking)
323       opts.setDebugInfo(llvm::codegenoptions::LocTrackingOnly);
324   }
325 
326   if (auto *a = args.getLastArg(clang::driver::options::OPT_save_temps_EQ))
327     opts.SaveTempsDir = a->getValue();
328 
329   // -mrelocation-model option.
330   if (const llvm::opt::Arg *a =
331           args.getLastArg(clang::driver::options::OPT_mrelocation_model)) {
332     llvm::StringRef modelName = a->getValue();
333     auto relocModel =
334         llvm::StringSwitch<std::optional<llvm::Reloc::Model>>(modelName)
335             .Case("static", llvm::Reloc::Static)
336             .Case("pic", llvm::Reloc::PIC_)
337             .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
338             .Case("ropi", llvm::Reloc::ROPI)
339             .Case("rwpi", llvm::Reloc::RWPI)
340             .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
341             .Default(std::nullopt);
342     if (relocModel.has_value())
343       opts.setRelocationModel(*relocModel);
344     else
345       diags.Report(clang::diag::err_drv_invalid_value)
346           << a->getAsString(args) << modelName;
347   }
348 
349   // -pic-level and -pic-is-pie option.
350   if (int picLevel = getLastArgIntValue(
351           args, clang::driver::options::OPT_pic_level, 0, diags)) {
352     if (picLevel > 2)
353       diags.Report(clang::diag::err_drv_invalid_value)
354           << args.getLastArg(clang::driver::options::OPT_pic_level)
355                  ->getAsString(args)
356           << picLevel;
357 
358     opts.PICLevel = picLevel;
359     if (args.hasArg(clang::driver::options::OPT_pic_is_pie))
360       opts.IsPIE = 1;
361   }
362 
363   // This option is compatible with -f[no-]underscoring in gfortran.
364   if (args.hasFlag(clang::driver::options::OPT_fno_underscoring,
365                    clang::driver::options::OPT_funderscoring, false)) {
366     opts.Underscoring = 0;
367   }
368 }
369 
370 /// Parses all target input arguments and populates the target
371 /// options accordingly.
372 ///
373 /// \param [in] opts The target options instance to update
374 /// \param [in] args The list of input arguments (from the compiler invocation)
375 static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
376   if (const llvm::opt::Arg *a =
377           args.getLastArg(clang::driver::options::OPT_triple))
378     opts.triple = a->getValue();
379 
380   if (const llvm::opt::Arg *a =
381           args.getLastArg(clang::driver::options::OPT_target_cpu))
382     opts.cpu = a->getValue();
383 
384   for (const llvm::opt::Arg *currentArg :
385        args.filtered(clang::driver::options::OPT_target_feature))
386     opts.featuresAsWritten.emplace_back(currentArg->getValue());
387 }
388 
389 // Tweak the frontend configuration based on the frontend action
390 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
391   if (opts.programAction == DebugDumpParsingLog)
392     opts.instrumentedParse = true;
393 
394   if (opts.programAction == DebugDumpProvenance ||
395       opts.programAction == Fortran::frontend::GetDefinition)
396     opts.needProvenanceRangeToCharBlockMappings = true;
397 }
398 
399 /// Parse the argument specified for the -fconvert=<value> option
400 static std::optional<const char *> parseConvertArg(const char *s) {
401   return llvm::StringSwitch<std::optional<const char *>>(s)
402       .Case("unknown", "UNKNOWN")
403       .Case("native", "NATIVE")
404       .Case("little-endian", "LITTLE_ENDIAN")
405       .Case("big-endian", "BIG_ENDIAN")
406       .Case("swap", "SWAP")
407       .Default(std::nullopt);
408 }
409 
410 static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
411                               clang::DiagnosticsEngine &diags) {
412   unsigned numErrorsBefore = diags.getNumErrors();
413 
414   // By default the frontend driver creates a ParseSyntaxOnly action.
415   opts.programAction = ParseSyntaxOnly;
416 
417   // Treat multiple action options as an invocation error. Note that `clang
418   // -cc1` does accept multiple action options, but will only consider the
419   // rightmost one.
420   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
421     const unsigned diagID = diags.getCustomDiagID(
422         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
423     diags.Report(diagID);
424     return false;
425   }
426 
427   // Identify the action (i.e. opts.ProgramAction)
428   if (const llvm::opt::Arg *a =
429           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
430     switch (a->getOption().getID()) {
431     default: {
432       llvm_unreachable("Invalid option in group!");
433     }
434     case clang::driver::options::OPT_test_io:
435       opts.programAction = InputOutputTest;
436       break;
437     case clang::driver::options::OPT_E:
438       opts.programAction = PrintPreprocessedInput;
439       break;
440     case clang::driver::options::OPT_fsyntax_only:
441       opts.programAction = ParseSyntaxOnly;
442       break;
443     case clang::driver::options::OPT_emit_fir:
444       opts.programAction = EmitFIR;
445       break;
446     case clang::driver::options::OPT_emit_hlfir:
447       opts.programAction = EmitHLFIR;
448       break;
449     case clang::driver::options::OPT_emit_llvm:
450       opts.programAction = EmitLLVM;
451       break;
452     case clang::driver::options::OPT_emit_llvm_bc:
453       opts.programAction = EmitLLVMBitcode;
454       break;
455     case clang::driver::options::OPT_emit_obj:
456       opts.programAction = EmitObj;
457       break;
458     case clang::driver::options::OPT_S:
459       opts.programAction = EmitAssembly;
460       break;
461     case clang::driver::options::OPT_fdebug_unparse:
462       opts.programAction = DebugUnparse;
463       break;
464     case clang::driver::options::OPT_fdebug_unparse_no_sema:
465       opts.programAction = DebugUnparseNoSema;
466       break;
467     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
468       opts.programAction = DebugUnparseWithSymbols;
469       break;
470     case clang::driver::options::OPT_fdebug_dump_symbols:
471       opts.programAction = DebugDumpSymbols;
472       break;
473     case clang::driver::options::OPT_fdebug_dump_parse_tree:
474       opts.programAction = DebugDumpParseTree;
475       break;
476     case clang::driver::options::OPT_fdebug_dump_pft:
477       opts.programAction = DebugDumpPFT;
478       break;
479     case clang::driver::options::OPT_fdebug_dump_all:
480       opts.programAction = DebugDumpAll;
481       break;
482     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
483       opts.programAction = DebugDumpParseTreeNoSema;
484       break;
485     case clang::driver::options::OPT_fdebug_dump_provenance:
486       opts.programAction = DebugDumpProvenance;
487       break;
488     case clang::driver::options::OPT_fdebug_dump_parsing_log:
489       opts.programAction = DebugDumpParsingLog;
490       break;
491     case clang::driver::options::OPT_fdebug_measure_parse_tree:
492       opts.programAction = DebugMeasureParseTree;
493       break;
494     case clang::driver::options::OPT_fdebug_pre_fir_tree:
495       opts.programAction = DebugPreFIRTree;
496       break;
497     case clang::driver::options::OPT_fget_symbols_sources:
498       opts.programAction = GetSymbolsSources;
499       break;
500     case clang::driver::options::OPT_fget_definition:
501       opts.programAction = GetDefinition;
502       break;
503     case clang::driver::options::OPT_init_only:
504       opts.programAction = InitOnly;
505       break;
506 
507       // TODO:
508       // case clang::driver::options::OPT_emit_llvm:
509       // case clang::driver::options::OPT_emit_llvm_only:
510       // case clang::driver::options::OPT_emit_codegen_only:
511       // case clang::driver::options::OPT_emit_module:
512       // (...)
513     }
514 
515     // Parse the values provided with `-fget-definition` (there should be 3
516     // integers)
517     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
518         clang::driver::options::OPT_fget_definition) {
519       unsigned optVals[3] = {0, 0, 0};
520 
521       for (unsigned i = 0; i < 3; i++) {
522         llvm::StringRef val = a->getValue(i);
523 
524         if (val.getAsInteger(10, optVals[i])) {
525           // A non-integer was encountered - that's an error.
526           diags.Report(clang::diag::err_drv_invalid_value)
527               << a->getOption().getName() << val;
528           break;
529         }
530       }
531       opts.getDefVals.line = optVals[0];
532       opts.getDefVals.startColumn = optVals[1];
533       opts.getDefVals.endColumn = optVals[2];
534     }
535   }
536 
537   // Parsing -load <dsopath> option and storing shared object path
538   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
539     opts.plugins.push_back(a->getValue());
540   }
541 
542   // Parsing -plugin <name> option and storing plugin name and setting action
543   if (const llvm::opt::Arg *a =
544           args.getLastArg(clang::driver::options::OPT_plugin)) {
545     opts.programAction = PluginAction;
546     opts.actionName = a->getValue();
547   }
548 
549   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
550   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
551   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
552 
553   // Get the input kind (from the value passed via `-x`)
554   InputKind dashX(Language::Unknown);
555   if (const llvm::opt::Arg *a =
556           args.getLastArg(clang::driver::options::OPT_x)) {
557     llvm::StringRef xValue = a->getValue();
558     // Principal languages.
559     dashX = llvm::StringSwitch<InputKind>(xValue)
560                 // Flang does not differentiate between pre-processed and not
561                 // pre-processed inputs.
562                 .Case("f95", Language::Fortran)
563                 .Case("f95-cpp-input", Language::Fortran)
564                 .Default(Language::Unknown);
565 
566     // Flang's intermediate representations.
567     if (dashX.isUnknown())
568       dashX = llvm::StringSwitch<InputKind>(xValue)
569                   .Case("ir", Language::LLVM_IR)
570                   .Case("fir", Language::MLIR)
571                   .Case("mlir", Language::MLIR)
572                   .Default(Language::Unknown);
573 
574     if (dashX.isUnknown())
575       diags.Report(clang::diag::err_drv_invalid_value)
576           << a->getAsString(args) << a->getValue();
577   }
578 
579   // Collect the input files and save them in our instance of FrontendOptions.
580   std::vector<std::string> inputs =
581       args.getAllArgValues(clang::driver::options::OPT_INPUT);
582   opts.inputs.clear();
583   if (inputs.empty())
584     // '-' is the default input if none is given.
585     inputs.push_back("-");
586   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
587     InputKind ik = dashX;
588     if (ik.isUnknown()) {
589       ik = FrontendOptions::getInputKindForExtension(
590           llvm::StringRef(inputs[i]).rsplit('.').second);
591       if (ik.isUnknown())
592         ik = Language::Unknown;
593       if (i == 0)
594         dashX = ik;
595     }
596 
597     opts.inputs.emplace_back(std::move(inputs[i]), ik);
598   }
599 
600   // Set fortranForm based on options -ffree-form and -ffixed-form.
601   if (const auto *arg =
602           args.getLastArg(clang::driver::options::OPT_ffixed_form,
603                           clang::driver::options::OPT_ffree_form)) {
604     opts.fortranForm =
605         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
606             ? FortranForm::FixedForm
607             : FortranForm::FreeForm;
608   }
609 
610   // Set fixedFormColumns based on -ffixed-line-length=<value>
611   if (const auto *arg =
612           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
613     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
614     std::int64_t columns = -1;
615     if (argValue == "none") {
616       columns = 0;
617     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
618       columns = -1;
619     }
620     if (columns < 0) {
621       diags.Report(clang::diag::err_drv_negative_columns)
622           << arg->getOption().getName() << arg->getValue();
623     } else if (columns == 0) {
624       opts.fixedFormColumns = 1000000;
625     } else if (columns < 7) {
626       diags.Report(clang::diag::err_drv_small_columns)
627           << arg->getOption().getName() << arg->getValue() << "7";
628     } else {
629       opts.fixedFormColumns = columns;
630     }
631   }
632 
633   // Set conversion based on -fconvert=<value>
634   if (const auto *arg =
635           args.getLastArg(clang::driver::options::OPT_fconvert_EQ)) {
636     const char *argValue = arg->getValue();
637     if (auto convert = parseConvertArg(argValue))
638       opts.envDefaults.push_back({"FORT_CONVERT", *convert});
639     else
640       diags.Report(clang::diag::err_drv_invalid_value)
641           << arg->getAsString(args) << argValue;
642   }
643 
644   // -f{no-}implicit-none
645   opts.features.Enable(
646       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
647       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
648                    clang::driver::options::OPT_fno_implicit_none, false));
649 
650   // -f{no-}backslash
651   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
652                        args.hasFlag(clang::driver::options::OPT_fbackslash,
653                                     clang::driver::options::OPT_fno_backslash,
654                                     false));
655 
656   // -f{no-}logical-abbreviations
657   opts.features.Enable(
658       Fortran::common::LanguageFeature::LogicalAbbreviations,
659       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
660                    clang::driver::options::OPT_fno_logical_abbreviations,
661                    false));
662 
663   // -f{no-}xor-operator
664   opts.features.Enable(
665       Fortran::common::LanguageFeature::XOROperator,
666       args.hasFlag(clang::driver::options::OPT_fxor_operator,
667                    clang::driver::options::OPT_fno_xor_operator, false));
668 
669   // -fno-automatic
670   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
671     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
672   }
673 
674   if (args.hasArg(
675           clang::driver::options::OPT_falternative_parameter_statement)) {
676     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
677   }
678   if (const llvm::opt::Arg *arg =
679           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
680     llvm::StringRef argValue = arg->getValue();
681     if (argValue == "utf-8") {
682       opts.encoding = Fortran::parser::Encoding::UTF_8;
683     } else if (argValue == "latin-1") {
684       opts.encoding = Fortran::parser::Encoding::LATIN_1;
685     } else {
686       diags.Report(clang::diag::err_drv_invalid_value)
687           << arg->getAsString(args) << argValue;
688     }
689   }
690 
691   setUpFrontendBasedOnAction(opts);
692   opts.dashX = dashX;
693 
694   return diags.getNumErrors() == numErrorsBefore;
695 }
696 
697 // Generate the path to look for intrinsic modules
698 static std::string getIntrinsicDir(const char *argv) {
699   // TODO: Find a system independent API
700   llvm::SmallString<128> driverPath;
701   driverPath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
702   llvm::sys::path::remove_filename(driverPath);
703   driverPath.append("/../include/flang/");
704   return std::string(driverPath);
705 }
706 
707 // Generate the path to look for OpenMP headers
708 static std::string getOpenMPHeadersDir(const char *argv) {
709   llvm::SmallString<128> includePath;
710   includePath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
711   llvm::sys::path::remove_filename(includePath);
712   includePath.append("/../include/flang/OpenMP/");
713   return std::string(includePath);
714 }
715 
716 /// Parses all preprocessor input arguments and populates the preprocessor
717 /// options accordingly.
718 ///
719 /// \param [in] opts The preprocessor options instance
720 /// \param [out] args The list of input arguments
721 static void parsePreprocessorArgs(Fortran::frontend::PreprocessorOptions &opts,
722                                   llvm::opt::ArgList &args) {
723   // Add macros from the command line.
724   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_D,
725                                               clang::driver::options::OPT_U)) {
726     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
727       opts.addMacroDef(currentArg->getValue());
728     } else {
729       opts.addMacroUndef(currentArg->getValue());
730     }
731   }
732 
733   // Add the ordered list of -I's.
734   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
735     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
736 
737   // Prepend the ordered list of -intrinsic-modules-path
738   // to the default location to search.
739   for (const auto *currentArg :
740        args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
741     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
742 
743   // -cpp/-nocpp
744   if (const auto *currentArg = args.getLastArg(
745           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
746     opts.macrosFlag =
747         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
748             ? PPMacrosFlag::Include
749             : PPMacrosFlag::Exclude;
750 
751   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
752   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
753 }
754 
755 /// Parses all semantic related arguments and populates the variables
756 /// options accordingly. Returns false if new errors are generated.
757 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
758                           clang::DiagnosticsEngine &diags) {
759   unsigned numErrorsBefore = diags.getNumErrors();
760 
761   // -J/module-dir option
762   auto moduleDirList =
763       args.getAllArgValues(clang::driver::options::OPT_module_dir);
764   // User can only specify -J/-module-dir once
765   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
766   if (moduleDirList.size() > 1) {
767     const unsigned diagID =
768         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
769                               "Only one '-module-dir/-J' option allowed");
770     diags.Report(diagID);
771   }
772   if (moduleDirList.size() == 1)
773     res.setModuleDir(moduleDirList[0]);
774 
775   // -fdebug-module-writer option
776   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
777     res.setDebugModuleDir(true);
778   }
779 
780   // -module-suffix
781   if (const auto *moduleSuffix =
782           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
783     res.setModuleFileSuffix(moduleSuffix->getValue());
784   }
785 
786   // -f{no-}analyzed-objects-for-unparse
787   res.setUseAnalyzedObjectsForUnparse(args.hasFlag(
788       clang::driver::options::OPT_fanalyzed_objects_for_unparse,
789       clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
790 
791   return diags.getNumErrors() == numErrorsBefore;
792 }
793 
794 /// Parses all diagnostics related arguments and populates the variables
795 /// options accordingly. Returns false if new errors are generated.
796 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
797                           clang::DiagnosticsEngine &diags) {
798   unsigned numErrorsBefore = diags.getNumErrors();
799 
800   // -Werror option
801   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
802   // this has to change when other -W<opt>'s are supported.
803   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
804     const auto &wArgs =
805         args.getAllArgValues(clang::driver::options::OPT_W_Joined);
806     for (const auto &wArg : wArgs) {
807       if (wArg == "error") {
808         res.setWarnAsErr(true);
809       } else {
810         const unsigned diagID =
811             diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
812                                   "Only `-Werror` is supported currently.");
813         diags.Report(diagID);
814       }
815     }
816   }
817 
818   // Default to off for `flang-new -fc1`.
819   res.getFrontendOpts().showColors =
820       parseShowColorsArgs(args, /*defaultDiagColor=*/false);
821 
822   // Honor color diagnostics.
823   res.getDiagnosticOpts().ShowColors = res.getFrontendOpts().showColors;
824 
825   return diags.getNumErrors() == numErrorsBefore;
826 }
827 
828 /// Parses all Dialect related arguments and populates the variables
829 /// options accordingly. Returns false if new errors are generated.
830 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
831                              clang::DiagnosticsEngine &diags) {
832   unsigned numErrorsBefore = diags.getNumErrors();
833 
834   // -fdefault* family
835   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
836     res.getDefaultKinds().set_defaultRealKind(8);
837     res.getDefaultKinds().set_doublePrecisionKind(16);
838   }
839   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
840     res.getDefaultKinds().set_defaultIntegerKind(8);
841     res.getDefaultKinds().set_subscriptIntegerKind(8);
842     res.getDefaultKinds().set_sizeIntegerKind(8);
843     res.getDefaultKinds().set_defaultLogicalKind(8);
844   }
845   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
846     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
847       // -fdefault-double-8 has to be used with -fdefault-real-8
848       // to be compatible with gfortran
849       const unsigned diagID = diags.getCustomDiagID(
850           clang::DiagnosticsEngine::Error,
851           "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
852       diags.Report(diagID);
853     }
854     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
855     res.getDefaultKinds().set_doublePrecisionKind(8);
856   }
857   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
858     res.getDefaultKinds().set_sizeIntegerKind(8);
859 
860   // -fopenmp and -fopenacc
861   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
862     res.getFrontendOpts().features.Enable(
863         Fortran::common::LanguageFeature::OpenACC);
864   }
865   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
866     // By default OpenMP is set to 1.1 version
867     res.getLangOpts().OpenMPVersion = 11;
868     res.getFrontendOpts().features.Enable(
869         Fortran::common::LanguageFeature::OpenMP);
870     if (int Version = getLastArgIntValue(
871             args, clang::driver::options::OPT_fopenmp_version_EQ,
872             res.getLangOpts().OpenMPVersion, diags)) {
873       res.getLangOpts().OpenMPVersion = Version;
874     }
875     if (args.hasArg(clang::driver::options::OPT_fopenmp_is_target_device)) {
876       res.getLangOpts().OpenMPIsTargetDevice = 1;
877 
878       // Get OpenMP host file path if any and report if a non existent file is
879       // found
880       if (auto *arg = args.getLastArg(
881               clang::driver::options::OPT_fopenmp_host_ir_file_path)) {
882         res.getLangOpts().OMPHostIRFile = arg->getValue();
883         if (!llvm::sys::fs::exists(res.getLangOpts().OMPHostIRFile))
884           diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
885               << res.getLangOpts().OMPHostIRFile;
886       }
887 
888       if (args.hasFlag(
889               clang::driver::options::OPT_fopenmp_assume_teams_oversubscription,
890               clang::driver::options::
891                   OPT_fno_openmp_assume_teams_oversubscription,
892               /*Default=*/false))
893         res.getLangOpts().OpenMPTeamSubscription = true;
894 
895       if (args.hasArg(
896               clang::driver::options::OPT_fopenmp_assume_no_thread_state))
897         res.getLangOpts().OpenMPNoThreadState = 1;
898 
899       if (args.hasArg(
900               clang::driver::options::OPT_fopenmp_assume_no_nested_parallelism))
901         res.getLangOpts().OpenMPNoNestedParallelism = 1;
902 
903       if (args.hasFlag(clang::driver::options::
904                            OPT_fopenmp_assume_threads_oversubscription,
905                        clang::driver::options::
906                            OPT_fno_openmp_assume_threads_oversubscription,
907                        /*Default=*/false))
908         res.getLangOpts().OpenMPThreadSubscription = true;
909 
910       if ((args.hasArg(clang::driver::options::OPT_fopenmp_target_debug) ||
911            args.hasArg(clang::driver::options::OPT_fopenmp_target_debug_EQ))) {
912         res.getLangOpts().OpenMPTargetDebug = getLastArgIntValue(
913             args, clang::driver::options::OPT_fopenmp_target_debug_EQ,
914             res.getLangOpts().OpenMPTargetDebug, diags);
915 
916         if (!res.getLangOpts().OpenMPTargetDebug &&
917             args.hasArg(clang::driver::options::OPT_fopenmp_target_debug))
918           res.getLangOpts().OpenMPTargetDebug = 1;
919       }
920     }
921 
922     switch (llvm::Triple(res.getTargetOpts().triple).getArch()) {
923     case llvm::Triple::nvptx:
924     case llvm::Triple::nvptx64:
925     case llvm::Triple::amdgcn:
926       if (!res.getLangOpts().OpenMPIsTargetDevice) {
927         const unsigned diagID = diags.getCustomDiagID(
928             clang::DiagnosticsEngine::Error,
929             "OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
930         diags.Report(diagID);
931       }
932       res.getLangOpts().OpenMPIsGPU = 1;
933       break;
934     default:
935       res.getLangOpts().OpenMPIsGPU = 0;
936       break;
937     }
938   }
939 
940   // -pedantic
941   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
942     res.setEnableConformanceChecks();
943     res.setEnableUsageChecks();
944   }
945   // -std=f2018
946   // TODO: Set proper options when more fortran standards
947   // are supported.
948   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
949     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
950     // We only allow f2018 as the given standard
951     if (standard.equals("f2018")) {
952       res.setEnableConformanceChecks();
953     } else {
954       const unsigned diagID =
955           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
956                                 "Only -std=f2018 is allowed currently.");
957       diags.Report(diagID);
958     }
959   }
960   return diags.getNumErrors() == numErrorsBefore;
961 }
962 
963 /// Parses all floating point related arguments and populates the
964 /// CompilerInvocation accordingly.
965 /// Returns false if new errors are generated.
966 ///
967 /// \param [out] invoc Stores the processed arguments
968 /// \param [in] args The compiler invocation arguments to parse
969 /// \param [out] diags DiagnosticsEngine to report erros with
970 static bool parseFloatingPointArgs(CompilerInvocation &invoc,
971                                    llvm::opt::ArgList &args,
972                                    clang::DiagnosticsEngine &diags) {
973   LangOptions &opts = invoc.getLangOpts();
974 
975   if (const llvm::opt::Arg *a =
976           args.getLastArg(clang::driver::options::OPT_ffp_contract)) {
977     const llvm::StringRef val = a->getValue();
978     enum LangOptions::FPModeKind fpContractMode;
979 
980     if (val == "off")
981       fpContractMode = LangOptions::FPM_Off;
982     else if (val == "fast")
983       fpContractMode = LangOptions::FPM_Fast;
984     else {
985       diags.Report(clang::diag::err_drv_unsupported_option_argument)
986           << a->getSpelling() << val;
987       return false;
988     }
989 
990     opts.setFPContractMode(fpContractMode);
991   }
992 
993   if (args.getLastArg(clang::driver::options::OPT_menable_no_infinities)) {
994     opts.NoHonorInfs = true;
995   }
996 
997   if (args.getLastArg(clang::driver::options::OPT_menable_no_nans)) {
998     opts.NoHonorNaNs = true;
999   }
1000 
1001   if (args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
1002     opts.ApproxFunc = true;
1003   }
1004 
1005   if (args.getLastArg(clang::driver::options::OPT_fno_signed_zeros)) {
1006     opts.NoSignedZeros = true;
1007   }
1008 
1009   if (args.getLastArg(clang::driver::options::OPT_mreassociate)) {
1010     opts.AssociativeMath = true;
1011   }
1012 
1013   if (args.getLastArg(clang::driver::options::OPT_freciprocal_math)) {
1014     opts.ReciprocalMath = true;
1015   }
1016 
1017   if (args.getLastArg(clang::driver::options::OPT_ffast_math)) {
1018     opts.NoHonorInfs = true;
1019     opts.NoHonorNaNs = true;
1020     opts.AssociativeMath = true;
1021     opts.ReciprocalMath = true;
1022     opts.ApproxFunc = true;
1023     opts.NoSignedZeros = true;
1024     opts.setFPContractMode(LangOptions::FPM_Fast);
1025   }
1026 
1027   return true;
1028 }
1029 
1030 /// Parses vscale range options and populates the CompilerInvocation
1031 /// accordingly.
1032 /// Returns false if new errors are generated.
1033 ///
1034 /// \param [out] invoc Stores the processed arguments
1035 /// \param [in] args The compiler invocation arguments to parse
1036 /// \param [out] diags DiagnosticsEngine to report erros with
1037 static bool parseVScaleArgs(CompilerInvocation &invoc, llvm::opt::ArgList &args,
1038                             clang::DiagnosticsEngine &diags) {
1039   LangOptions &opts = invoc.getLangOpts();
1040   if (const auto arg =
1041           args.getLastArg(clang::driver::options::OPT_mvscale_min_EQ)) {
1042     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
1043     unsigned VScaleMin;
1044     if (argValue.getAsInteger(/*Radix=*/10, VScaleMin)) {
1045       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1046           << arg->getSpelling() << argValue;
1047       return false;
1048     }
1049     opts.VScaleMin = VScaleMin;
1050   }
1051   if (const auto arg =
1052           args.getLastArg(clang::driver::options::OPT_mvscale_max_EQ)) {
1053     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
1054     unsigned VScaleMax;
1055     if (argValue.getAsInteger(/*Radix=w*/ 10, VScaleMax)) {
1056       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1057           << arg->getSpelling() << argValue;
1058       return false;
1059     }
1060     opts.VScaleMax = VScaleMax;
1061   }
1062   return true;
1063 }
1064 
1065 static bool parseLinkerOptionsArgs(CompilerInvocation &invoc,
1066                                    llvm::opt::ArgList &args,
1067                                    clang::DiagnosticsEngine &diags) {
1068   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1069 
1070   // TODO: support --dependent-lib on other platforms when MLIR supports
1071   //       !llvm.dependent.lib
1072   if (args.hasArg(clang::driver::options::OPT_dependent_lib) &&
1073       !triple.isOSWindows()) {
1074     const unsigned diagID =
1075         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1076                               "--dependent-lib is only supported on Windows");
1077     diags.Report(diagID);
1078     return false;
1079   }
1080 
1081   invoc.getCodeGenOpts().DependentLibs =
1082       args.getAllArgValues(clang::driver::options::OPT_dependent_lib);
1083   return true;
1084 }
1085 
1086 bool CompilerInvocation::createFromArgs(
1087     CompilerInvocation &res, llvm::ArrayRef<const char *> commandLineArgs,
1088     clang::DiagnosticsEngine &diags, const char *argv0) {
1089 
1090   bool success = true;
1091 
1092   // Set the default triple for this CompilerInvocation. This might be
1093   // overridden by users with `-triple` (see the call to `ParseTargetArgs`
1094   // below).
1095   // NOTE: Like in Clang, it would be nice to use option marshalling
1096   // for this so that the entire logic for setting-up the triple is in one
1097   // place.
1098   res.getTargetOpts().triple =
1099       llvm::Triple::normalize(llvm::sys::getDefaultTargetTriple());
1100 
1101   // Parse the arguments
1102   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
1103   llvm::opt::Visibility visibilityMask(clang::driver::options::FC1Option);
1104   unsigned missingArgIndex, missingArgCount;
1105   llvm::opt::InputArgList args = opts.ParseArgs(
1106       commandLineArgs, missingArgIndex, missingArgCount, visibilityMask);
1107 
1108   // Check for missing argument error.
1109   if (missingArgCount) {
1110     diags.Report(clang::diag::err_drv_missing_argument)
1111         << args.getArgString(missingArgIndex) << missingArgCount;
1112     success = false;
1113   }
1114 
1115   // Issue errors on unknown arguments
1116   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
1117     auto argString = a->getAsString(args);
1118     std::string nearest;
1119     if (opts.findNearest(argString, nearest, visibilityMask) > 1)
1120       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
1121     else
1122       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
1123           << argString << nearest;
1124     success = false;
1125   }
1126 
1127   // -flang-experimental-hlfir
1128   if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir) ||
1129       args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1130     res.loweringOpts.setLowerToHighLevelFIR(true);
1131   }
1132 
1133   // -flang-deprecated-no-hlfir
1134   if (args.hasArg(clang::driver::options::OPT_flang_deprecated_no_hlfir) &&
1135       !args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1136     if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir)) {
1137       const unsigned diagID = diags.getCustomDiagID(
1138           clang::DiagnosticsEngine::Error,
1139           "Options '-flang-experimental-hlfir' and "
1140           "'-flang-deprecated-no-hlfir' cannot be both specified");
1141       diags.Report(diagID);
1142     }
1143     res.loweringOpts.setLowerToHighLevelFIR(false);
1144   }
1145 
1146   if (args.hasArg(clang::driver::options::OPT_flang_experimental_polymorphism)) {
1147     res.loweringOpts.setPolymorphicTypeImpl(true);
1148   }
1149 
1150   // -fno-ppc-native-vector-element-order
1151   if (args.hasArg(clang::driver::options::OPT_fno_ppc_native_vec_elem_order)) {
1152     res.loweringOpts.setNoPPCNativeVecElemOrder(true);
1153   }
1154 
1155   // Preserve all the remark options requested, i.e. -Rpass, -Rpass-missed or
1156   // -Rpass-analysis. This will be used later when processing and outputting the
1157   // remarks generated by LLVM in ExecuteCompilerInvocation.cpp.
1158   for (auto *a : args.filtered(clang::driver::options::OPT_R_Group)) {
1159     if (a->getOption().matches(clang::driver::options::OPT_R_value_Group))
1160       // This is -Rfoo=, where foo is the name of the diagnostic
1161       // group. Add only the remark option name to the diagnostics. e.g. for
1162       // -Rpass= we will add the string "pass".
1163       res.getDiagnosticOpts().Remarks.push_back(
1164           std::string(a->getOption().getName().drop_front(1).rtrim("=-")));
1165     else
1166       // If no regex was provided, add the provided value, e.g. for -Rpass add
1167       // the string "pass".
1168       res.getDiagnosticOpts().Remarks.push_back(a->getValue());
1169   }
1170 
1171   success &= parseFrontendArgs(res.getFrontendOpts(), args, diags);
1172   parseTargetArgs(res.getTargetOpts(), args);
1173   parsePreprocessorArgs(res.getPreprocessorOpts(), args);
1174   parseCodeGenArgs(res.getCodeGenOpts(), args, diags);
1175   success &= parseDebugArgs(res.getCodeGenOpts(), args, diags);
1176   success &= parseVectorLibArg(res.getCodeGenOpts(), args, diags);
1177   success &= parseSemaArgs(res, args, diags);
1178   success &= parseDialectArgs(res, args, diags);
1179   success &= parseDiagArgs(res, args, diags);
1180 
1181   // Collect LLVM (-mllvm) and MLIR (-mmlir) options.
1182   // NOTE: Try to avoid adding any options directly to `llvmArgs` or
1183   // `mlirArgs`. Instead, you can use
1184   //    * `-mllvm <your-llvm-option>`, or
1185   //    * `-mmlir <your-mlir-option>`.
1186   res.frontendOpts.llvmArgs =
1187       args.getAllArgValues(clang::driver::options::OPT_mllvm);
1188   res.frontendOpts.mlirArgs =
1189       args.getAllArgValues(clang::driver::options::OPT_mmlir);
1190 
1191   success &= parseFloatingPointArgs(res, args, diags);
1192 
1193   success &= parseVScaleArgs(res, args, diags);
1194 
1195   success &= parseLinkerOptionsArgs(res, args, diags);
1196 
1197   // Set the string to be used as the return value of the COMPILER_OPTIONS
1198   // intrinsic of iso_fortran_env. This is either passed in from the parent
1199   // compiler driver invocation with an environment variable, or failing that
1200   // set to the command line arguments of the frontend driver invocation.
1201   res.allCompilerInvocOpts = std::string();
1202   llvm::raw_string_ostream os(res.allCompilerInvocOpts);
1203   char *compilerOptsEnv = std::getenv("FLANG_COMPILER_OPTIONS_STRING");
1204   if (compilerOptsEnv != nullptr) {
1205     os << compilerOptsEnv;
1206   } else {
1207     os << argv0 << ' ';
1208     for (auto it = commandLineArgs.begin(), e = commandLineArgs.end(); it != e;
1209          ++it) {
1210       os << ' ' << *it;
1211     }
1212   }
1213 
1214   res.setArgv0(argv0);
1215 
1216   return success;
1217 }
1218 
1219 void CompilerInvocation::collectMacroDefinitions() {
1220   auto &ppOpts = this->getPreprocessorOpts();
1221 
1222   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
1223     llvm::StringRef macro = ppOpts.macros[i].first;
1224     bool isUndef = ppOpts.macros[i].second;
1225 
1226     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
1227     llvm::StringRef macroName = macroPair.first;
1228     llvm::StringRef macroBody = macroPair.second;
1229 
1230     // For an #undef'd macro, we only care about the name.
1231     if (isUndef) {
1232       parserOpts.predefinitions.emplace_back(macroName.str(),
1233                                              std::optional<std::string>{});
1234       continue;
1235     }
1236 
1237     // For a #define'd macro, figure out the actual definition.
1238     if (macroName.size() == macro.size())
1239       macroBody = "1";
1240     else {
1241       // Note: GCC drops anything following an end-of-line character.
1242       llvm::StringRef::size_type end = macroBody.find_first_of("\n\r");
1243       macroBody = macroBody.substr(0, end);
1244     }
1245     parserOpts.predefinitions.emplace_back(
1246         macroName, std::optional<std::string>(macroBody.str()));
1247   }
1248 }
1249 
1250 void CompilerInvocation::setDefaultFortranOpts() {
1251   auto &fortranOptions = getFortranOpts();
1252 
1253   std::vector<std::string> searchDirectories{"."s};
1254   fortranOptions.searchDirectories = searchDirectories;
1255 
1256   // Add the location of omp_lib.h to the search directories. Currently this is
1257   // identical to the modules' directory.
1258   fortranOptions.searchDirectories.emplace_back(
1259       getOpenMPHeadersDir(getArgv0()));
1260 
1261   fortranOptions.isFixedForm = false;
1262 }
1263 
1264 // TODO: When expanding this method, consider creating a dedicated API for
1265 // this. Also at some point we will need to differentiate between different
1266 // targets and add dedicated predefines for each.
1267 void CompilerInvocation::setDefaultPredefinitions() {
1268   auto &fortranOptions = getFortranOpts();
1269   const auto &frontendOptions = getFrontendOpts();
1270   // Populate the macro list with version numbers and other predefinitions.
1271   fortranOptions.predefinitions.emplace_back("__flang__", "1");
1272   fortranOptions.predefinitions.emplace_back("__flang_major__",
1273                                              FLANG_VERSION_MAJOR_STRING);
1274   fortranOptions.predefinitions.emplace_back("__flang_minor__",
1275                                              FLANG_VERSION_MINOR_STRING);
1276   fortranOptions.predefinitions.emplace_back("__flang_patchlevel__",
1277                                              FLANG_VERSION_PATCHLEVEL_STRING);
1278 
1279   // Add predefinitions based on extensions enabled
1280   if (frontendOptions.features.IsEnabled(
1281           Fortran::common::LanguageFeature::OpenACC)) {
1282     fortranOptions.predefinitions.emplace_back("_OPENACC", "202211");
1283   }
1284   if (frontendOptions.features.IsEnabled(
1285           Fortran::common::LanguageFeature::OpenMP)) {
1286     Fortran::common::setOpenMPMacro(getLangOpts().OpenMPVersion,
1287                                     fortranOptions.predefinitions);
1288   }
1289   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1290   if (targetTriple.getArch() == llvm::Triple::ArchType::x86_64) {
1291     fortranOptions.predefinitions.emplace_back("__x86_64__", "1");
1292     fortranOptions.predefinitions.emplace_back("__x86_64", "1");
1293   }
1294 }
1295 
1296 void CompilerInvocation::setFortranOpts() {
1297   auto &fortranOptions = getFortranOpts();
1298   const auto &frontendOptions = getFrontendOpts();
1299   const auto &preprocessorOptions = getPreprocessorOpts();
1300   auto &moduleDirJ = getModuleDir();
1301 
1302   if (frontendOptions.fortranForm != FortranForm::Unknown) {
1303     fortranOptions.isFixedForm =
1304         frontendOptions.fortranForm == FortranForm::FixedForm;
1305   }
1306   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
1307 
1308   fortranOptions.features = frontendOptions.features;
1309   fortranOptions.encoding = frontendOptions.encoding;
1310 
1311   // Adding search directories specified by -I
1312   fortranOptions.searchDirectories.insert(
1313       fortranOptions.searchDirectories.end(),
1314       preprocessorOptions.searchDirectoriesFromDashI.begin(),
1315       preprocessorOptions.searchDirectoriesFromDashI.end());
1316 
1317   // Add the ordered list of -intrinsic-modules-path
1318   fortranOptions.searchDirectories.insert(
1319       fortranOptions.searchDirectories.end(),
1320       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
1321       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
1322 
1323   //  Add the default intrinsic module directory
1324   fortranOptions.intrinsicModuleDirectories.emplace_back(
1325       getIntrinsicDir(getArgv0()));
1326 
1327   // Add the directory supplied through -J/-module-dir to the list of search
1328   // directories
1329   if (moduleDirJ != ".")
1330     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
1331 
1332   if (frontendOptions.instrumentedParse)
1333     fortranOptions.instrumentedParse = true;
1334 
1335   if (frontendOptions.showColors)
1336     fortranOptions.showColors = true;
1337 
1338   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
1339     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
1340 
1341   if (getEnableConformanceChecks())
1342     fortranOptions.features.WarnOnAllNonstandard();
1343 
1344   if (getEnableUsageChecks())
1345     fortranOptions.features.WarnOnAllUsage();
1346 }
1347 
1348 std::unique_ptr<Fortran::semantics::SemanticsContext>
1349 CompilerInvocation::getSemanticsCtx(
1350     Fortran::parser::AllCookedSources &allCookedSources) {
1351   auto &fortranOptions = getFortranOpts();
1352 
1353   auto semanticsContext = std::make_unique<semantics::SemanticsContext>(
1354       getDefaultKinds(), fortranOptions.features, allCookedSources);
1355 
1356   semanticsContext->set_moduleDirectory(getModuleDir())
1357       .set_searchDirectories(fortranOptions.searchDirectories)
1358       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
1359       .set_warningsAreErrors(getWarnAsErr())
1360       .set_moduleFileSuffix(getModuleFileSuffix())
1361       .set_underscoring(getCodeGenOpts().Underscoring);
1362 
1363   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1364   // FIXME: Handle real(3) ?
1365   if (targetTriple.getArch() != llvm::Triple::ArchType::x86_64) {
1366     semanticsContext->targetCharacteristics().DisableType(
1367         Fortran::common::TypeCategory::Real, /*kind=*/10);
1368   }
1369 
1370   std::string version = Fortran::common::getFlangFullVersion();
1371   semanticsContext->targetCharacteristics()
1372       .set_compilerOptionsString(allCompilerInvocOpts)
1373       .set_compilerVersionString(version);
1374 
1375   if (targetTriple.isPPC())
1376     semanticsContext->targetCharacteristics().set_isPPC(true);
1377 
1378   return semanticsContext;
1379 }
1380 
1381 /// Set \p loweringOptions controlling lowering behavior based
1382 /// on the \p optimizationLevel.
1383 void CompilerInvocation::setLoweringOptions() {
1384   const CodeGenOptions &codegenOpts = getCodeGenOpts();
1385 
1386   // Lower TRANSPOSE as a runtime call under -O0.
1387   loweringOpts.setOptimizeTranspose(codegenOpts.OptimizationLevel > 0);
1388   loweringOpts.setUnderscoring(codegenOpts.Underscoring);
1389 
1390   const LangOptions &langOptions = getLangOpts();
1391   Fortran::common::MathOptionsBase &mathOpts = loweringOpts.getMathOptions();
1392   // TODO: when LangOptions are finalized, we can represent
1393   //       the math related options using Fortran::commmon::MathOptionsBase,
1394   //       so that we can just copy it into LoweringOptions.
1395   mathOpts
1396       .setFPContractEnabled(langOptions.getFPContractMode() ==
1397                             LangOptions::FPM_Fast)
1398       .setNoHonorInfs(langOptions.NoHonorInfs)
1399       .setNoHonorNaNs(langOptions.NoHonorNaNs)
1400       .setApproxFunc(langOptions.ApproxFunc)
1401       .setNoSignedZeros(langOptions.NoSignedZeros)
1402       .setAssociativeMath(langOptions.AssociativeMath)
1403       .setReciprocalMath(langOptions.ReciprocalMath);
1404 }
1405