xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision c593e3d0f77509ce65a6f5bd744f2d1ea9935c47) 
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/Tools/TargetSetup.h"
22 #include "flang/Version.inc"
23 #include "clang/Basic/AllDiagnostics.h"
24 #include "clang/Basic/DiagnosticDriver.h"
25 #include "clang/Basic/DiagnosticOptions.h"
26 #include "clang/Driver/DriverDiagnostic.h"
27 #include "clang/Driver/OptionUtils.h"
28 #include "clang/Driver/Options.h"
29 #include "llvm/ADT/StringRef.h"
30 #include "llvm/ADT/StringSwitch.h"
31 #include "llvm/Frontend/Debug/Options.h"
32 #include "llvm/Option/Arg.h"
33 #include "llvm/Option/ArgList.h"
34 #include "llvm/Option/OptTable.h"
35 #include "llvm/Support/CodeGen.h"
36 #include "llvm/Support/FileSystem.h"
37 #include "llvm/Support/FileUtilities.h"
38 #include "llvm/Support/Path.h"
39 #include "llvm/Support/Process.h"
40 #include "llvm/Support/raw_ostream.h"
41 #include "llvm/TargetParser/Host.h"
42 #include "llvm/TargetParser/Triple.h"
43 #include <algorithm>
44 #include <cstdlib>
45 #include <memory>
46 #include <optional>
47 
48 using namespace Fortran::frontend;
49 
50 //===----------------------------------------------------------------------===//
51 // Initialization.
52 //===----------------------------------------------------------------------===//
53 CompilerInvocationBase::CompilerInvocationBase()
54     : diagnosticOpts(new clang::DiagnosticOptions()),
55       preprocessorOpts(new PreprocessorOptions()) {}
56 
57 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &x)
58     : diagnosticOpts(new clang::DiagnosticOptions(x.getDiagnosticOpts())),
59       preprocessorOpts(new PreprocessorOptions(x.getPreprocessorOpts())) {}
60 
61 CompilerInvocationBase::~CompilerInvocationBase() = default;
62 
63 //===----------------------------------------------------------------------===//
64 // Deserialization (from args)
65 //===----------------------------------------------------------------------===//
66 static bool parseShowColorsArgs(const llvm::opt::ArgList &args,
67                                 bool defaultColor = true) {
68   // Color diagnostics default to auto ("on" if terminal supports) in the
69   // compiler driver `flang` but default to off in the frontend driver
70   // `flang -fc1`, needing an explicit OPT_fdiagnostics_color.
71   // Support both clang's -f[no-]color-diagnostics and gcc's
72   // -f[no-]diagnostics-colors[=never|always|auto].
73   enum {
74     Colors_On,
75     Colors_Off,
76     Colors_Auto
77   } showColors = defaultColor ? Colors_Auto : Colors_Off;
78 
79   for (auto *a : args) {
80     const llvm::opt::Option &opt = a->getOption();
81     if (opt.matches(clang::driver::options::OPT_fcolor_diagnostics)) {
82       showColors = Colors_On;
83     } else if (opt.matches(clang::driver::options::OPT_fno_color_diagnostics)) {
84       showColors = Colors_Off;
85     } else if (opt.matches(clang::driver::options::OPT_fdiagnostics_color_EQ)) {
86       llvm::StringRef value(a->getValue());
87       if (value == "always")
88         showColors = Colors_On;
89       else if (value == "never")
90         showColors = Colors_Off;
91       else if (value == "auto")
92         showColors = Colors_Auto;
93     }
94   }
95 
96   return showColors == Colors_On ||
97          (showColors == Colors_Auto &&
98           llvm::sys::Process::StandardErrHasColors());
99 }
100 
101 /// Extracts the optimisation level from \a args.
102 static unsigned getOptimizationLevel(llvm::opt::ArgList &args,
103                                      clang::DiagnosticsEngine &diags) {
104   unsigned defaultOpt = 0;
105 
106   if (llvm::opt::Arg *a =
107           args.getLastArg(clang::driver::options::OPT_O_Group)) {
108     if (a->getOption().matches(clang::driver::options::OPT_O0))
109       return 0;
110 
111     assert(a->getOption().matches(clang::driver::options::OPT_O));
112 
113     return getLastArgIntValue(args, clang::driver::options::OPT_O, defaultOpt,
114                               diags);
115   }
116 
117   return defaultOpt;
118 }
119 
120 bool Fortran::frontend::parseDiagnosticArgs(clang::DiagnosticOptions &opts,
121                                             llvm::opt::ArgList &args) {
122   opts.ShowColors = parseShowColorsArgs(args);
123 
124   return true;
125 }
126 
127 static bool parseDebugArgs(Fortran::frontend::CodeGenOptions &opts,
128                            llvm::opt::ArgList &args,
129                            clang::DiagnosticsEngine &diags) {
130   using DebugInfoKind = llvm::codegenoptions::DebugInfoKind;
131   if (llvm::opt::Arg *arg =
132           args.getLastArg(clang::driver::options::OPT_debug_info_kind_EQ)) {
133     std::optional<DebugInfoKind> val =
134         llvm::StringSwitch<std::optional<DebugInfoKind>>(arg->getValue())
135             .Case("line-tables-only", llvm::codegenoptions::DebugLineTablesOnly)
136             .Case("line-directives-only",
137                   llvm::codegenoptions::DebugDirectivesOnly)
138             .Case("constructor", llvm::codegenoptions::DebugInfoConstructor)
139             .Case("limited", llvm::codegenoptions::LimitedDebugInfo)
140             .Case("standalone", llvm::codegenoptions::FullDebugInfo)
141             .Case("unused-types", llvm::codegenoptions::UnusedTypeInfo)
142             .Default(std::nullopt);
143     if (!val.has_value()) {
144       diags.Report(clang::diag::err_drv_invalid_value)
145           << arg->getAsString(args) << arg->getValue();
146       return false;
147     }
148     opts.setDebugInfo(val.value());
149     if (val != llvm::codegenoptions::DebugLineTablesOnly &&
150         val != llvm::codegenoptions::FullDebugInfo &&
151         val != llvm::codegenoptions::NoDebugInfo) {
152       const auto debugWarning = diags.getCustomDiagID(
153           clang::DiagnosticsEngine::Warning, "Unsupported debug option: %0");
154       diags.Report(debugWarning) << arg->getValue();
155     }
156   }
157   return true;
158 }
159 
160 static bool parseVectorLibArg(Fortran::frontend::CodeGenOptions &opts,
161                               llvm::opt::ArgList &args,
162                               clang::DiagnosticsEngine &diags) {
163   llvm::opt::Arg *arg = args.getLastArg(clang::driver::options::OPT_fveclib);
164   if (!arg)
165     return true;
166 
167   using VectorLibrary = llvm::driver::VectorLibrary;
168   std::optional<VectorLibrary> val =
169       llvm::StringSwitch<std::optional<VectorLibrary>>(arg->getValue())
170           .Case("Accelerate", VectorLibrary::Accelerate)
171           .Case("LIBMVEC", VectorLibrary::LIBMVEC)
172           .Case("MASSV", VectorLibrary::MASSV)
173           .Case("SVML", VectorLibrary::SVML)
174           .Case("SLEEF", VectorLibrary::SLEEF)
175           .Case("Darwin_libsystem_m", VectorLibrary::Darwin_libsystem_m)
176           .Case("ArmPL", VectorLibrary::ArmPL)
177           .Case("NoLibrary", VectorLibrary::NoLibrary)
178           .Default(std::nullopt);
179   if (!val.has_value()) {
180     diags.Report(clang::diag::err_drv_invalid_value)
181         << arg->getAsString(args) << arg->getValue();
182     return false;
183   }
184   opts.setVecLib(val.value());
185   return true;
186 }
187 
188 // Generate an OptRemark object containing info on if the -Rgroup
189 // specified is enabled or not.
190 static CodeGenOptions::OptRemark
191 parseOptimizationRemark(clang::DiagnosticsEngine &diags,
192                         llvm::opt::ArgList &args, llvm::opt::OptSpecifier optEq,
193                         llvm::StringRef remarkOptName) {
194   assert((remarkOptName == "pass" || remarkOptName == "pass-missed" ||
195           remarkOptName == "pass-analysis") &&
196          "Unsupported remark option name provided.");
197   CodeGenOptions::OptRemark result;
198 
199   for (llvm::opt::Arg *a : args) {
200     if (a->getOption().matches(clang::driver::options::OPT_R_Joined)) {
201       llvm::StringRef value = a->getValue();
202 
203       if (value == remarkOptName) {
204         result.Kind = CodeGenOptions::RemarkKind::RK_Enabled;
205         // Enable everything
206         result.Pattern = ".*";
207         result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
208 
209       } else if (value.split('-') ==
210                  std::make_pair(llvm::StringRef("no"), remarkOptName)) {
211         result.Kind = CodeGenOptions::RemarkKind::RK_Disabled;
212         // Disable everything
213         result.Pattern = "";
214         result.Regex = nullptr;
215       }
216     } else if (a->getOption().matches(optEq)) {
217       result.Kind = CodeGenOptions::RemarkKind::RK_WithPattern;
218       result.Pattern = a->getValue();
219       result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
220       std::string regexError;
221 
222       if (!result.Regex->isValid(regexError)) {
223         diags.Report(clang::diag::err_drv_optimization_remark_pattern)
224             << regexError << a->getAsString(args);
225         return CodeGenOptions::OptRemark();
226       }
227     }
228   }
229   return result;
230 }
231 
232 static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
233                              llvm::opt::ArgList &args,
234                              clang::DiagnosticsEngine &diags) {
235   opts.OptimizationLevel = getOptimizationLevel(args, diags);
236 
237   if (args.hasFlag(clang::driver::options::OPT_fdebug_pass_manager,
238                    clang::driver::options::OPT_fno_debug_pass_manager, false))
239     opts.DebugPassManager = 1;
240 
241   if (args.hasFlag(clang::driver::options::OPT_fstack_arrays,
242                    clang::driver::options::OPT_fno_stack_arrays, false))
243     opts.StackArrays = 1;
244 
245   if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
246                    clang::driver::options::OPT_fno_loop_versioning, false))
247     opts.LoopVersioning = 1;
248 
249   opts.AliasAnalysis = opts.OptimizationLevel > 0;
250 
251   // -mframe-pointer=none/non-leaf/all option.
252   if (const llvm::opt::Arg *a =
253           args.getLastArg(clang::driver::options::OPT_mframe_pointer_EQ)) {
254     std::optional<llvm::FramePointerKind> val =
255         llvm::StringSwitch<std::optional<llvm::FramePointerKind>>(a->getValue())
256             .Case("none", llvm::FramePointerKind::None)
257             .Case("non-leaf", llvm::FramePointerKind::NonLeaf)
258             .Case("all", llvm::FramePointerKind::All)
259             .Default(std::nullopt);
260 
261     if (!val.has_value()) {
262       diags.Report(clang::diag::err_drv_invalid_value)
263           << a->getAsString(args) << a->getValue();
264     } else
265       opts.setFramePointer(val.value());
266   }
267 
268   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
269     opts.LLVMPassPlugins.push_back(a->getValue());
270 
271   // -fembed-offload-object option
272   for (auto *a :
273        args.filtered(clang::driver::options::OPT_fembed_offload_object_EQ))
274     opts.OffloadObjects.push_back(a->getValue());
275 
276   // -flto=full/thin option.
277   if (const llvm::opt::Arg *a =
278           args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
279     llvm::StringRef s = a->getValue();
280     assert((s == "full" || s == "thin") && "Unknown LTO mode.");
281     if (s == "full")
282       opts.PrepareForFullLTO = true;
283     else
284       opts.PrepareForThinLTO = true;
285   }
286 
287   if (const llvm::opt::Arg *a = args.getLastArg(
288           clang::driver::options::OPT_mcode_object_version_EQ)) {
289     llvm::StringRef s = a->getValue();
290     if (s == "6")
291       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_6;
292     if (s == "5")
293       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_5;
294     if (s == "4")
295       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_4;
296     if (s == "none")
297       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_None;
298   }
299 
300   // -f[no-]save-optimization-record[=<format>]
301   if (const llvm::opt::Arg *a =
302           args.getLastArg(clang::driver::options::OPT_opt_record_file))
303     opts.OptRecordFile = a->getValue();
304 
305   // Optimization file format. Defaults to yaml
306   if (const llvm::opt::Arg *a =
307           args.getLastArg(clang::driver::options::OPT_opt_record_format))
308     opts.OptRecordFormat = a->getValue();
309 
310   // Specifies, using a regex, which successful optimization passes(middle and
311   // backend), to include in the final optimization record file generated. If
312   // not provided -fsave-optimization-record will include all passes.
313   if (const llvm::opt::Arg *a =
314           args.getLastArg(clang::driver::options::OPT_opt_record_passes))
315     opts.OptRecordPasses = a->getValue();
316 
317   // Create OptRemark that allows printing of all successful optimization
318   // passes applied.
319   opts.OptimizationRemark =
320       parseOptimizationRemark(diags, args, clang::driver::options::OPT_Rpass_EQ,
321                               /*remarkOptName=*/"pass");
322 
323   // Create OptRemark that allows all missed optimization passes to be printed.
324   opts.OptimizationRemarkMissed = parseOptimizationRemark(
325       diags, args, clang::driver::options::OPT_Rpass_missed_EQ,
326       /*remarkOptName=*/"pass-missed");
327 
328   // Create OptRemark that allows all optimization decisions made by LLVM
329   // to be printed.
330   opts.OptimizationRemarkAnalysis = parseOptimizationRemark(
331       diags, args, clang::driver::options::OPT_Rpass_analysis_EQ,
332       /*remarkOptName=*/"pass-analysis");
333 
334   if (opts.getDebugInfo() == llvm::codegenoptions::NoDebugInfo) {
335     // If the user requested a flag that requires source locations available in
336     // the backend, make sure that the backend tracks source location
337     // information.
338     bool needLocTracking = !opts.OptRecordFile.empty() ||
339                            !opts.OptRecordPasses.empty() ||
340                            !opts.OptRecordFormat.empty() ||
341                            opts.OptimizationRemark.hasValidPattern() ||
342                            opts.OptimizationRemarkMissed.hasValidPattern() ||
343                            opts.OptimizationRemarkAnalysis.hasValidPattern();
344 
345     if (needLocTracking)
346       opts.setDebugInfo(llvm::codegenoptions::LocTrackingOnly);
347   }
348 
349   if (auto *a = args.getLastArg(clang::driver::options::OPT_save_temps_EQ))
350     opts.SaveTempsDir = a->getValue();
351 
352   // -record-command-line option.
353   if (const llvm::opt::Arg *a =
354           args.getLastArg(clang::driver::options::OPT_record_command_line)) {
355     opts.RecordCommandLine = a->getValue();
356   }
357 
358   // -mlink-builtin-bitcode
359   for (auto *a :
360        args.filtered(clang::driver::options::OPT_mlink_builtin_bitcode))
361     opts.BuiltinBCLibs.push_back(a->getValue());
362 
363   // -mrelocation-model option.
364   if (const llvm::opt::Arg *a =
365           args.getLastArg(clang::driver::options::OPT_mrelocation_model)) {
366     llvm::StringRef modelName = a->getValue();
367     auto relocModel =
368         llvm::StringSwitch<std::optional<llvm::Reloc::Model>>(modelName)
369             .Case("static", llvm::Reloc::Static)
370             .Case("pic", llvm::Reloc::PIC_)
371             .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
372             .Case("ropi", llvm::Reloc::ROPI)
373             .Case("rwpi", llvm::Reloc::RWPI)
374             .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
375             .Default(std::nullopt);
376     if (relocModel.has_value())
377       opts.setRelocationModel(*relocModel);
378     else
379       diags.Report(clang::diag::err_drv_invalid_value)
380           << a->getAsString(args) << modelName;
381   }
382 
383   // -pic-level and -pic-is-pie option.
384   if (int picLevel = getLastArgIntValue(
385           args, clang::driver::options::OPT_pic_level, 0, diags)) {
386     if (picLevel > 2)
387       diags.Report(clang::diag::err_drv_invalid_value)
388           << args.getLastArg(clang::driver::options::OPT_pic_level)
389                  ->getAsString(args)
390           << picLevel;
391 
392     opts.PICLevel = picLevel;
393     if (args.hasArg(clang::driver::options::OPT_pic_is_pie))
394       opts.IsPIE = 1;
395   }
396 
397   // -mcmodel option.
398   if (const llvm::opt::Arg *a =
399           args.getLastArg(clang::driver::options::OPT_mcmodel_EQ)) {
400     llvm::StringRef modelName = a->getValue();
401     std::optional<llvm::CodeModel::Model> codeModel = getCodeModel(modelName);
402 
403     if (codeModel.has_value())
404       opts.CodeModel = modelName;
405     else
406       diags.Report(clang::diag::err_drv_invalid_value)
407           << a->getAsString(args) << modelName;
408   }
409 
410   if (const llvm::opt::Arg *arg = args.getLastArg(
411           clang::driver::options::OPT_mlarge_data_threshold_EQ)) {
412     uint64_t LDT;
413     if (llvm::StringRef(arg->getValue()).getAsInteger(/*Radix=*/10, LDT)) {
414       diags.Report(clang::diag::err_drv_invalid_value)
415           << arg->getSpelling() << arg->getValue();
416     }
417     opts.LargeDataThreshold = LDT;
418   }
419 
420   // This option is compatible with -f[no-]underscoring in gfortran.
421   if (args.hasFlag(clang::driver::options::OPT_fno_underscoring,
422                    clang::driver::options::OPT_funderscoring, false)) {
423     opts.Underscoring = 0;
424   }
425 }
426 
427 /// Parses all target input arguments and populates the target
428 /// options accordingly.
429 ///
430 /// \param [in] opts The target options instance to update
431 /// \param [in] args The list of input arguments (from the compiler invocation)
432 static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
433   if (const llvm::opt::Arg *a =
434           args.getLastArg(clang::driver::options::OPT_triple))
435     opts.triple = a->getValue();
436 
437   if (const llvm::opt::Arg *a =
438           args.getLastArg(clang::driver::options::OPT_target_cpu))
439     opts.cpu = a->getValue();
440 
441   if (const llvm::opt::Arg *a =
442           args.getLastArg(clang::driver::options::OPT_tune_cpu))
443     opts.cpuToTuneFor = a->getValue();
444 
445   for (const llvm::opt::Arg *currentArg :
446        args.filtered(clang::driver::options::OPT_target_feature))
447     opts.featuresAsWritten.emplace_back(currentArg->getValue());
448 
449   if (args.hasArg(clang::driver::options::OPT_fdisable_real_10))
450     opts.disabledRealKinds.push_back(10);
451 
452   if (args.hasArg(clang::driver::options::OPT_fdisable_real_3))
453     opts.disabledRealKinds.push_back(3);
454 
455   if (args.hasArg(clang::driver::options::OPT_fdisable_integer_2))
456     opts.disabledIntegerKinds.push_back(2);
457 
458   if (args.hasArg(clang::driver::options::OPT_fdisable_integer_16))
459     opts.disabledIntegerKinds.push_back(16);
460 
461   if (const llvm::opt::Arg *a =
462           args.getLastArg(clang::driver::options::OPT_mabi_EQ)) {
463     llvm::StringRef V = a->getValue();
464     if (V == "vec-extabi") {
465       opts.EnableAIXExtendedAltivecABI = true;
466     } else if (V == "vec-default") {
467       opts.EnableAIXExtendedAltivecABI = false;
468     }
469   }
470 }
471 // Tweak the frontend configuration based on the frontend action
472 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
473   if (opts.programAction == DebugDumpParsingLog)
474     opts.instrumentedParse = true;
475 
476   if (opts.programAction == DebugDumpProvenance ||
477       opts.programAction == Fortran::frontend::GetDefinition)
478     opts.needProvenanceRangeToCharBlockMappings = true;
479 }
480 
481 /// Parse the argument specified for the -fconvert=<value> option
482 static std::optional<const char *> parseConvertArg(const char *s) {
483   return llvm::StringSwitch<std::optional<const char *>>(s)
484       .Case("unknown", "UNKNOWN")
485       .Case("native", "NATIVE")
486       .Case("little-endian", "LITTLE_ENDIAN")
487       .Case("big-endian", "BIG_ENDIAN")
488       .Case("swap", "SWAP")
489       .Default(std::nullopt);
490 }
491 
492 static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
493                               clang::DiagnosticsEngine &diags) {
494   unsigned numErrorsBefore = diags.getNumErrors();
495 
496   // By default the frontend driver creates a ParseSyntaxOnly action.
497   opts.programAction = ParseSyntaxOnly;
498 
499   // Treat multiple action options as an invocation error. Note that `clang
500   // -cc1` does accept multiple action options, but will only consider the
501   // rightmost one.
502   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
503     const unsigned diagID = diags.getCustomDiagID(
504         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
505     diags.Report(diagID);
506     return false;
507   }
508 
509   // Identify the action (i.e. opts.ProgramAction)
510   if (const llvm::opt::Arg *a =
511           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
512     switch (a->getOption().getID()) {
513     default: {
514       llvm_unreachable("Invalid option in group!");
515     }
516     case clang::driver::options::OPT_test_io:
517       opts.programAction = InputOutputTest;
518       break;
519     case clang::driver::options::OPT_E:
520       opts.programAction = PrintPreprocessedInput;
521       break;
522     case clang::driver::options::OPT_fsyntax_only:
523       opts.programAction = ParseSyntaxOnly;
524       break;
525     case clang::driver::options::OPT_emit_fir:
526       opts.programAction = EmitFIR;
527       break;
528     case clang::driver::options::OPT_emit_hlfir:
529       opts.programAction = EmitHLFIR;
530       break;
531     case clang::driver::options::OPT_emit_llvm:
532       opts.programAction = EmitLLVM;
533       break;
534     case clang::driver::options::OPT_emit_llvm_bc:
535       opts.programAction = EmitLLVMBitcode;
536       break;
537     case clang::driver::options::OPT_emit_obj:
538       opts.programAction = EmitObj;
539       break;
540     case clang::driver::options::OPT_S:
541       opts.programAction = EmitAssembly;
542       break;
543     case clang::driver::options::OPT_fdebug_unparse:
544       opts.programAction = DebugUnparse;
545       break;
546     case clang::driver::options::OPT_fdebug_unparse_no_sema:
547       opts.programAction = DebugUnparseNoSema;
548       break;
549     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
550       opts.programAction = DebugUnparseWithSymbols;
551       break;
552     case clang::driver::options::OPT_fdebug_unparse_with_modules:
553       opts.programAction = DebugUnparseWithModules;
554       break;
555     case clang::driver::options::OPT_fdebug_dump_symbols:
556       opts.programAction = DebugDumpSymbols;
557       break;
558     case clang::driver::options::OPT_fdebug_dump_parse_tree:
559       opts.programAction = DebugDumpParseTree;
560       break;
561     case clang::driver::options::OPT_fdebug_dump_pft:
562       opts.programAction = DebugDumpPFT;
563       break;
564     case clang::driver::options::OPT_fdebug_dump_all:
565       opts.programAction = DebugDumpAll;
566       break;
567     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
568       opts.programAction = DebugDumpParseTreeNoSema;
569       break;
570     case clang::driver::options::OPT_fdebug_dump_provenance:
571       opts.programAction = DebugDumpProvenance;
572       break;
573     case clang::driver::options::OPT_fdebug_dump_parsing_log:
574       opts.programAction = DebugDumpParsingLog;
575       break;
576     case clang::driver::options::OPT_fdebug_measure_parse_tree:
577       opts.programAction = DebugMeasureParseTree;
578       break;
579     case clang::driver::options::OPT_fdebug_pre_fir_tree:
580       opts.programAction = DebugPreFIRTree;
581       break;
582     case clang::driver::options::OPT_fget_symbols_sources:
583       opts.programAction = GetSymbolsSources;
584       break;
585     case clang::driver::options::OPT_fget_definition:
586       opts.programAction = GetDefinition;
587       break;
588     case clang::driver::options::OPT_init_only:
589       opts.programAction = InitOnly;
590       break;
591 
592       // TODO:
593       // case clang::driver::options::OPT_emit_llvm:
594       // case clang::driver::options::OPT_emit_llvm_only:
595       // case clang::driver::options::OPT_emit_codegen_only:
596       // case clang::driver::options::OPT_emit_module:
597       // (...)
598     }
599 
600     // Parse the values provided with `-fget-definition` (there should be 3
601     // integers)
602     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
603         clang::driver::options::OPT_fget_definition) {
604       unsigned optVals[3] = {0, 0, 0};
605 
606       for (unsigned i = 0; i < 3; i++) {
607         llvm::StringRef val = a->getValue(i);
608 
609         if (val.getAsInteger(10, optVals[i])) {
610           // A non-integer was encountered - that's an error.
611           diags.Report(clang::diag::err_drv_invalid_value)
612               << a->getOption().getName() << val;
613           break;
614         }
615       }
616       opts.getDefVals.line = optVals[0];
617       opts.getDefVals.startColumn = optVals[1];
618       opts.getDefVals.endColumn = optVals[2];
619     }
620   }
621 
622   // Parsing -load <dsopath> option and storing shared object path
623   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
624     opts.plugins.push_back(a->getValue());
625   }
626 
627   // Parsing -plugin <name> option and storing plugin name and setting action
628   if (const llvm::opt::Arg *a =
629           args.getLastArg(clang::driver::options::OPT_plugin)) {
630     opts.programAction = PluginAction;
631     opts.actionName = a->getValue();
632   }
633 
634   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
635   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
636   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
637   opts.printSupportedCPUs =
638       args.hasArg(clang::driver::options::OPT_print_supported_cpus);
639 
640   // Get the input kind (from the value passed via `-x`)
641   InputKind dashX(Language::Unknown);
642   if (const llvm::opt::Arg *a =
643           args.getLastArg(clang::driver::options::OPT_x)) {
644     llvm::StringRef xValue = a->getValue();
645     // Principal languages.
646     dashX = llvm::StringSwitch<InputKind>(xValue)
647                 // Flang does not differentiate between pre-processed and not
648                 // pre-processed inputs.
649                 .Case("f95", Language::Fortran)
650                 .Case("f95-cpp-input", Language::Fortran)
651                 // CUDA Fortran
652                 .Case("cuda", Language::Fortran)
653                 .Default(Language::Unknown);
654 
655     // Flang's intermediate representations.
656     if (dashX.isUnknown())
657       dashX = llvm::StringSwitch<InputKind>(xValue)
658                   .Case("ir", Language::LLVM_IR)
659                   .Case("fir", Language::MLIR)
660                   .Case("mlir", Language::MLIR)
661                   .Default(Language::Unknown);
662 
663     if (dashX.isUnknown())
664       diags.Report(clang::diag::err_drv_invalid_value)
665           << a->getAsString(args) << a->getValue();
666   }
667 
668   // Collect the input files and save them in our instance of FrontendOptions.
669   std::vector<std::string> inputs =
670       args.getAllArgValues(clang::driver::options::OPT_INPUT);
671   opts.inputs.clear();
672   if (inputs.empty())
673     // '-' is the default input if none is given.
674     inputs.push_back("-");
675   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
676     InputKind ik = dashX;
677     if (ik.isUnknown()) {
678       ik = FrontendOptions::getInputKindForExtension(
679           llvm::StringRef(inputs[i]).rsplit('.').second);
680       if (ik.isUnknown())
681         ik = Language::Unknown;
682       if (i == 0)
683         dashX = ik;
684     }
685 
686     opts.inputs.emplace_back(std::move(inputs[i]), ik);
687   }
688 
689   // Set fortranForm based on options -ffree-form and -ffixed-form.
690   if (const auto *arg =
691           args.getLastArg(clang::driver::options::OPT_ffixed_form,
692                           clang::driver::options::OPT_ffree_form)) {
693     opts.fortranForm =
694         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
695             ? FortranForm::FixedForm
696             : FortranForm::FreeForm;
697   }
698 
699   // Set fixedFormColumns based on -ffixed-line-length=<value>
700   if (const auto *arg =
701           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
702     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
703     std::int64_t columns = -1;
704     if (argValue == "none") {
705       columns = 0;
706     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
707       columns = -1;
708     }
709     if (columns < 0) {
710       diags.Report(clang::diag::err_drv_negative_columns)
711           << arg->getOption().getName() << arg->getValue();
712     } else if (columns == 0) {
713       opts.fixedFormColumns = 1000000;
714     } else if (columns < 7) {
715       diags.Report(clang::diag::err_drv_small_columns)
716           << arg->getOption().getName() << arg->getValue() << "7";
717     } else {
718       opts.fixedFormColumns = columns;
719     }
720   }
721 
722   // Set conversion based on -fconvert=<value>
723   if (const auto *arg =
724           args.getLastArg(clang::driver::options::OPT_fconvert_EQ)) {
725     const char *argValue = arg->getValue();
726     if (auto convert = parseConvertArg(argValue))
727       opts.envDefaults.push_back({"FORT_CONVERT", *convert});
728     else
729       diags.Report(clang::diag::err_drv_invalid_value)
730           << arg->getAsString(args) << argValue;
731   }
732 
733   // -f{no-}implicit-none
734   opts.features.Enable(
735       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
736       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
737                    clang::driver::options::OPT_fno_implicit_none, false));
738 
739   // -f{no-}backslash
740   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
741                        args.hasFlag(clang::driver::options::OPT_fbackslash,
742                                     clang::driver::options::OPT_fno_backslash,
743                                     false));
744 
745   // -f{no-}logical-abbreviations
746   opts.features.Enable(
747       Fortran::common::LanguageFeature::LogicalAbbreviations,
748       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
749                    clang::driver::options::OPT_fno_logical_abbreviations,
750                    false));
751 
752   // -f{no-}unsigned
753   opts.features.Enable(Fortran::common::LanguageFeature::Unsigned,
754                        args.hasFlag(clang::driver::options::OPT_funsigned,
755                                     clang::driver::options::OPT_fno_unsigned,
756                                     false));
757 
758   // -f{no-}xor-operator
759   opts.features.Enable(
760       Fortran::common::LanguageFeature::XOROperator,
761       args.hasFlag(clang::driver::options::OPT_fxor_operator,
762                    clang::driver::options::OPT_fno_xor_operator, false));
763 
764   // -fno-automatic
765   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
766     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
767   }
768 
769   // -fsave-main-program
770   if (args.hasArg(clang::driver::options::OPT_fsave_main_program)) {
771     opts.features.Enable(Fortran::common::LanguageFeature::SaveMainProgram);
772   }
773 
774   if (args.hasArg(
775           clang::driver::options::OPT_falternative_parameter_statement)) {
776     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
777   }
778   if (const llvm::opt::Arg *arg =
779           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
780     llvm::StringRef argValue = arg->getValue();
781     if (argValue == "utf-8") {
782       opts.encoding = Fortran::parser::Encoding::UTF_8;
783     } else if (argValue == "latin-1") {
784       opts.encoding = Fortran::parser::Encoding::LATIN_1;
785     } else {
786       diags.Report(clang::diag::err_drv_invalid_value)
787           << arg->getAsString(args) << argValue;
788     }
789   }
790 
791   setUpFrontendBasedOnAction(opts);
792   opts.dashX = dashX;
793 
794   return diags.getNumErrors() == numErrorsBefore;
795 }
796 
797 // Generate the path to look for intrinsic modules
798 static std::string getIntrinsicDir(const char *argv) {
799   // TODO: Find a system independent API
800   llvm::SmallString<128> driverPath;
801   driverPath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
802   llvm::sys::path::remove_filename(driverPath);
803   driverPath.append("/../include/flang/");
804   return std::string(driverPath);
805 }
806 
807 // Generate the path to look for OpenMP headers
808 static std::string getOpenMPHeadersDir(const char *argv) {
809   llvm::SmallString<128> includePath;
810   includePath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
811   llvm::sys::path::remove_filename(includePath);
812   includePath.append("/../include/flang/OpenMP/");
813   return std::string(includePath);
814 }
815 
816 /// Parses all preprocessor input arguments and populates the preprocessor
817 /// options accordingly.
818 ///
819 /// \param [in] opts The preprocessor options instance
820 /// \param [out] args The list of input arguments
821 static void parsePreprocessorArgs(Fortran::frontend::PreprocessorOptions &opts,
822                                   llvm::opt::ArgList &args) {
823   // Add macros from the command line.
824   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_D,
825                                               clang::driver::options::OPT_U)) {
826     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
827       opts.addMacroDef(currentArg->getValue());
828     } else {
829       opts.addMacroUndef(currentArg->getValue());
830     }
831   }
832 
833   // Add the ordered list of -I's.
834   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
835     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
836 
837   // Prepend the ordered list of -intrinsic-modules-path
838   // to the default location to search.
839   for (const auto *currentArg :
840        args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
841     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
842 
843   // -cpp/-nocpp
844   if (const auto *currentArg = args.getLastArg(
845           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
846     opts.macrosFlag =
847         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
848             ? PPMacrosFlag::Include
849             : PPMacrosFlag::Exclude;
850 
851   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
852   opts.preprocessIncludeLines =
853       args.hasArg(clang::driver::options::OPT_fpreprocess_include_lines);
854   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
855   opts.showMacros = args.hasArg(clang::driver::options::OPT_dM);
856 }
857 
858 /// Parses all semantic related arguments and populates the variables
859 /// options accordingly. Returns false if new errors are generated.
860 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
861                           clang::DiagnosticsEngine &diags) {
862   unsigned numErrorsBefore = diags.getNumErrors();
863 
864   // -J/module-dir option
865   std::vector<std::string> moduleDirList =
866       args.getAllArgValues(clang::driver::options::OPT_module_dir);
867   // User can only specify one -J/-module-dir directory, but may repeat
868   // -J/-module-dir as long as the directory is the same each time.
869   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
870   std::sort(moduleDirList.begin(), moduleDirList.end());
871   moduleDirList.erase(std::unique(moduleDirList.begin(), moduleDirList.end()),
872                       moduleDirList.end());
873   if (moduleDirList.size() > 1) {
874     const unsigned diagID =
875         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
876                               "Only one '-module-dir/-J' directory allowed. "
877                               "'-module-dir/-J' may be given multiple times "
878                               "but the directory must be the same each time.");
879     diags.Report(diagID);
880   }
881   if (moduleDirList.size() == 1)
882     res.setModuleDir(moduleDirList[0]);
883 
884   // -fdebug-module-writer option
885   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
886     res.setDebugModuleDir(true);
887   }
888 
889   // -fhermetic-module-files option
890   if (args.hasArg(clang::driver::options::OPT_fhermetic_module_files)) {
891     res.setHermeticModuleFileOutput(true);
892   }
893 
894   // -module-suffix
895   if (const auto *moduleSuffix =
896           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
897     res.setModuleFileSuffix(moduleSuffix->getValue());
898   }
899 
900   // -f{no-}analyzed-objects-for-unparse
901   res.setUseAnalyzedObjectsForUnparse(args.hasFlag(
902       clang::driver::options::OPT_fanalyzed_objects_for_unparse,
903       clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
904 
905   return diags.getNumErrors() == numErrorsBefore;
906 }
907 
908 /// Parses all diagnostics related arguments and populates the variables
909 /// options accordingly. Returns false if new errors are generated.
910 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
911                           clang::DiagnosticsEngine &diags) {
912   unsigned numErrorsBefore = diags.getNumErrors();
913 
914   // -Werror option
915   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
916   // this has to change when other -W<opt>'s are supported.
917   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
918     const auto &wArgs =
919         args.getAllArgValues(clang::driver::options::OPT_W_Joined);
920     for (const auto &wArg : wArgs) {
921       if (wArg == "error") {
922         res.setWarnAsErr(true);
923       } else {
924         const unsigned diagID =
925             diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
926                                   "Only `-Werror` is supported currently.");
927         diags.Report(diagID);
928       }
929     }
930   }
931 
932   // Default to off for `flang -fc1`.
933   res.getFrontendOpts().showColors =
934       parseShowColorsArgs(args, /*defaultDiagColor=*/false);
935 
936   // Honor color diagnostics.
937   res.getDiagnosticOpts().ShowColors = res.getFrontendOpts().showColors;
938 
939   return diags.getNumErrors() == numErrorsBefore;
940 }
941 
942 /// Parses all Dialect related arguments and populates the variables
943 /// options accordingly. Returns false if new errors are generated.
944 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
945                              clang::DiagnosticsEngine &diags) {
946   unsigned numErrorsBefore = diags.getNumErrors();
947 
948   // -fdefault* family
949   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
950     res.getDefaultKinds().set_defaultRealKind(8);
951     res.getDefaultKinds().set_doublePrecisionKind(16);
952   }
953   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
954     res.getDefaultKinds().set_defaultIntegerKind(8);
955     res.getDefaultKinds().set_subscriptIntegerKind(8);
956     res.getDefaultKinds().set_sizeIntegerKind(8);
957     res.getDefaultKinds().set_defaultLogicalKind(8);
958   }
959   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
960     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
961       // -fdefault-double-8 has to be used with -fdefault-real-8
962       // to be compatible with gfortran
963       const unsigned diagID = diags.getCustomDiagID(
964           clang::DiagnosticsEngine::Error,
965           "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
966       diags.Report(diagID);
967     }
968     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
969     res.getDefaultKinds().set_doublePrecisionKind(8);
970   }
971   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
972     res.getDefaultKinds().set_sizeIntegerKind(8);
973 
974   // -x cuda
975   auto language = args.getLastArgValue(clang::driver::options::OPT_x);
976   if (language == "cuda") {
977     res.getFrontendOpts().features.Enable(
978         Fortran::common::LanguageFeature::CUDA);
979   }
980 
981   // -fopenacc
982   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
983     res.getFrontendOpts().features.Enable(
984         Fortran::common::LanguageFeature::OpenACC);
985   }
986 
987   // -pedantic
988   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
989     res.setEnableConformanceChecks();
990     res.setEnableUsageChecks();
991   }
992 
993   // -w
994   if (args.hasArg(clang::driver::options::OPT_w))
995     res.setDisableWarnings();
996 
997   // -std=f2018
998   // TODO: Set proper options when more fortran standards
999   // are supported.
1000   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
1001     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
1002     // We only allow f2018 as the given standard
1003     if (standard == "f2018") {
1004       res.setEnableConformanceChecks();
1005     } else {
1006       const unsigned diagID =
1007           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1008                                 "Only -std=f2018 is allowed currently.");
1009       diags.Report(diagID);
1010     }
1011   }
1012   return diags.getNumErrors() == numErrorsBefore;
1013 }
1014 
1015 /// Parses all OpenMP related arguments if the -fopenmp option is present,
1016 /// populating the \c res object accordingly. Returns false if new errors are
1017 /// generated.
1018 static bool parseOpenMPArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
1019                             clang::DiagnosticsEngine &diags) {
1020   llvm::opt::Arg *arg = args.getLastArg(clang::driver::options::OPT_fopenmp,
1021                                         clang::driver::options::OPT_fno_openmp);
1022   if (!arg || arg->getOption().matches(clang::driver::options::OPT_fno_openmp))
1023     return true;
1024 
1025   unsigned numErrorsBefore = diags.getNumErrors();
1026   llvm::Triple t(res.getTargetOpts().triple);
1027 
1028   // By default OpenMP is set to 1.1 version
1029   res.getLangOpts().OpenMPVersion = 11;
1030   res.getFrontendOpts().features.Enable(
1031       Fortran::common::LanguageFeature::OpenMP);
1032   if (int Version = getLastArgIntValue(
1033           args, clang::driver::options::OPT_fopenmp_version_EQ,
1034           res.getLangOpts().OpenMPVersion, diags)) {
1035     res.getLangOpts().OpenMPVersion = Version;
1036   }
1037   if (args.hasArg(clang::driver::options::OPT_fopenmp_force_usm)) {
1038     res.getLangOpts().OpenMPForceUSM = 1;
1039   }
1040   if (args.hasArg(clang::driver::options::OPT_fopenmp_is_target_device)) {
1041     res.getLangOpts().OpenMPIsTargetDevice = 1;
1042 
1043     // Get OpenMP host file path if any and report if a non existent file is
1044     // found
1045     if (auto *arg = args.getLastArg(
1046             clang::driver::options::OPT_fopenmp_host_ir_file_path)) {
1047       res.getLangOpts().OMPHostIRFile = arg->getValue();
1048       if (!llvm::sys::fs::exists(res.getLangOpts().OMPHostIRFile))
1049         diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
1050             << res.getLangOpts().OMPHostIRFile;
1051     }
1052 
1053     if (args.hasFlag(
1054             clang::driver::options::OPT_fopenmp_assume_teams_oversubscription,
1055             clang::driver::options::
1056                 OPT_fno_openmp_assume_teams_oversubscription,
1057             /*Default=*/false))
1058       res.getLangOpts().OpenMPTeamSubscription = true;
1059 
1060     if (args.hasArg(clang::driver::options::OPT_fopenmp_assume_no_thread_state))
1061       res.getLangOpts().OpenMPNoThreadState = 1;
1062 
1063     if (args.hasArg(
1064             clang::driver::options::OPT_fopenmp_assume_no_nested_parallelism))
1065       res.getLangOpts().OpenMPNoNestedParallelism = 1;
1066 
1067     if (args.hasFlag(
1068             clang::driver::options::OPT_fopenmp_assume_threads_oversubscription,
1069             clang::driver::options::
1070                 OPT_fno_openmp_assume_threads_oversubscription,
1071             /*Default=*/false))
1072       res.getLangOpts().OpenMPThreadSubscription = true;
1073 
1074     if ((args.hasArg(clang::driver::options::OPT_fopenmp_target_debug) ||
1075          args.hasArg(clang::driver::options::OPT_fopenmp_target_debug_EQ))) {
1076       res.getLangOpts().OpenMPTargetDebug = getLastArgIntValue(
1077           args, clang::driver::options::OPT_fopenmp_target_debug_EQ,
1078           res.getLangOpts().OpenMPTargetDebug, diags);
1079 
1080       if (!res.getLangOpts().OpenMPTargetDebug &&
1081           args.hasArg(clang::driver::options::OPT_fopenmp_target_debug))
1082         res.getLangOpts().OpenMPTargetDebug = 1;
1083     }
1084     if (args.hasArg(clang::driver::options::OPT_nogpulib))
1085       res.getLangOpts().NoGPULib = 1;
1086   }
1087 
1088   switch (llvm::Triple(res.getTargetOpts().triple).getArch()) {
1089   case llvm::Triple::nvptx:
1090   case llvm::Triple::nvptx64:
1091   case llvm::Triple::amdgcn:
1092     if (!res.getLangOpts().OpenMPIsTargetDevice) {
1093       const unsigned diagID = diags.getCustomDiagID(
1094           clang::DiagnosticsEngine::Error,
1095           "OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
1096       diags.Report(diagID);
1097     }
1098     res.getLangOpts().OpenMPIsGPU = 1;
1099     break;
1100   default:
1101     res.getLangOpts().OpenMPIsGPU = 0;
1102     break;
1103   }
1104 
1105   // Get the OpenMP target triples if any.
1106   if (auto *arg =
1107           args.getLastArg(clang::driver::options::OPT_fopenmp_targets_EQ)) {
1108     enum ArchPtrSize { Arch16Bit, Arch32Bit, Arch64Bit };
1109     auto getArchPtrSize = [](const llvm::Triple &triple) {
1110       if (triple.isArch16Bit())
1111         return Arch16Bit;
1112       if (triple.isArch32Bit())
1113         return Arch32Bit;
1114       assert(triple.isArch64Bit() && "Expected 64-bit architecture");
1115       return Arch64Bit;
1116     };
1117 
1118     for (unsigned i = 0; i < arg->getNumValues(); ++i) {
1119       llvm::Triple tt(arg->getValue(i));
1120 
1121       if (tt.getArch() == llvm::Triple::UnknownArch ||
1122           !(tt.getArch() == llvm::Triple::aarch64 || tt.isPPC() ||
1123             tt.getArch() == llvm::Triple::systemz ||
1124             tt.getArch() == llvm::Triple::nvptx ||
1125             tt.getArch() == llvm::Triple::nvptx64 ||
1126             tt.getArch() == llvm::Triple::amdgcn ||
1127             tt.getArch() == llvm::Triple::x86 ||
1128             tt.getArch() == llvm::Triple::x86_64))
1129         diags.Report(clang::diag::err_drv_invalid_omp_target)
1130             << arg->getValue(i);
1131       else if (getArchPtrSize(t) != getArchPtrSize(tt))
1132         diags.Report(clang::diag::err_drv_incompatible_omp_arch)
1133             << arg->getValue(i) << t.str();
1134       else
1135         res.getLangOpts().OMPTargetTriples.push_back(tt);
1136     }
1137   }
1138   return diags.getNumErrors() == numErrorsBefore;
1139 }
1140 
1141 /// Parses signed integer overflow options and populates the
1142 /// CompilerInvocation accordingly.
1143 /// Returns false if new errors are generated.
1144 ///
1145 /// \param [out] invoc Stores the processed arguments
1146 /// \param [in] args The compiler invocation arguments to parse
1147 /// \param [out] diags DiagnosticsEngine to report erros with
1148 static bool parseIntegerOverflowArgs(CompilerInvocation &invoc,
1149                                      llvm::opt::ArgList &args,
1150                                      clang::DiagnosticsEngine &diags) {
1151   Fortran::common::LangOptions &opts = invoc.getLangOpts();
1152 
1153   if (args.getLastArg(clang::driver::options::OPT_fwrapv))
1154     opts.setSignedOverflowBehavior(Fortran::common::LangOptions::SOB_Defined);
1155 
1156   return true;
1157 }
1158 
1159 /// Parses all floating point related arguments and populates the
1160 /// CompilerInvocation accordingly.
1161 /// Returns false if new errors are generated.
1162 ///
1163 /// \param [out] invoc Stores the processed arguments
1164 /// \param [in] args The compiler invocation arguments to parse
1165 /// \param [out] diags DiagnosticsEngine to report erros with
1166 static bool parseFloatingPointArgs(CompilerInvocation &invoc,
1167                                    llvm::opt::ArgList &args,
1168                                    clang::DiagnosticsEngine &diags) {
1169   Fortran::common::LangOptions &opts = invoc.getLangOpts();
1170 
1171   if (const llvm::opt::Arg *a =
1172           args.getLastArg(clang::driver::options::OPT_ffp_contract)) {
1173     const llvm::StringRef val = a->getValue();
1174     enum Fortran::common::LangOptions::FPModeKind fpContractMode;
1175 
1176     if (val == "off")
1177       fpContractMode = Fortran::common::LangOptions::FPM_Off;
1178     else if (val == "fast")
1179       fpContractMode = Fortran::common::LangOptions::FPM_Fast;
1180     else {
1181       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1182           << a->getSpelling() << val;
1183       return false;
1184     }
1185 
1186     opts.setFPContractMode(fpContractMode);
1187   }
1188 
1189   if (args.getLastArg(clang::driver::options::OPT_menable_no_infs)) {
1190     opts.NoHonorInfs = true;
1191   }
1192 
1193   if (args.getLastArg(clang::driver::options::OPT_menable_no_nans)) {
1194     opts.NoHonorNaNs = true;
1195   }
1196 
1197   if (args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
1198     opts.ApproxFunc = true;
1199   }
1200 
1201   if (args.getLastArg(clang::driver::options::OPT_fno_signed_zeros)) {
1202     opts.NoSignedZeros = true;
1203   }
1204 
1205   if (args.getLastArg(clang::driver::options::OPT_mreassociate)) {
1206     opts.AssociativeMath = true;
1207   }
1208 
1209   if (args.getLastArg(clang::driver::options::OPT_freciprocal_math)) {
1210     opts.ReciprocalMath = true;
1211   }
1212 
1213   if (args.getLastArg(clang::driver::options::OPT_ffast_math)) {
1214     opts.NoHonorInfs = true;
1215     opts.NoHonorNaNs = true;
1216     opts.AssociativeMath = true;
1217     opts.ReciprocalMath = true;
1218     opts.ApproxFunc = true;
1219     opts.NoSignedZeros = true;
1220     opts.setFPContractMode(Fortran::common::LangOptions::FPM_Fast);
1221   }
1222 
1223   return true;
1224 }
1225 
1226 /// Parses vscale range options and populates the CompilerInvocation
1227 /// accordingly.
1228 /// Returns false if new errors are generated.
1229 ///
1230 /// \param [out] invoc Stores the processed arguments
1231 /// \param [in] args The compiler invocation arguments to parse
1232 /// \param [out] diags DiagnosticsEngine to report erros with
1233 static bool parseVScaleArgs(CompilerInvocation &invoc, llvm::opt::ArgList &args,
1234                             clang::DiagnosticsEngine &diags) {
1235   const auto *vscaleMin =
1236       args.getLastArg(clang::driver::options::OPT_mvscale_min_EQ);
1237   const auto *vscaleMax =
1238       args.getLastArg(clang::driver::options::OPT_mvscale_max_EQ);
1239 
1240   if (!vscaleMin && !vscaleMax)
1241     return true;
1242 
1243   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1244   if (!triple.isAArch64() && !triple.isRISCV()) {
1245     const unsigned diagID =
1246         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1247                               "`-mvscale-max` and `-mvscale-min` are not "
1248                               "supported for this architecture: %0");
1249     diags.Report(diagID) << triple.getArchName();
1250     return false;
1251   }
1252 
1253   Fortran::common::LangOptions &opts = invoc.getLangOpts();
1254   if (vscaleMin) {
1255     llvm::StringRef argValue = llvm::StringRef(vscaleMin->getValue());
1256     unsigned vscaleMinVal;
1257     if (argValue.getAsInteger(/*Radix=*/10, vscaleMinVal)) {
1258       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1259           << vscaleMax->getSpelling() << argValue;
1260       return false;
1261     }
1262     opts.VScaleMin = vscaleMinVal;
1263   }
1264 
1265   if (vscaleMax) {
1266     llvm::StringRef argValue = llvm::StringRef(vscaleMax->getValue());
1267     unsigned vscaleMaxVal;
1268     if (argValue.getAsInteger(/*Radix=w*/ 10, vscaleMaxVal)) {
1269       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1270           << vscaleMax->getSpelling() << argValue;
1271       return false;
1272     }
1273     opts.VScaleMax = vscaleMaxVal;
1274   }
1275   return true;
1276 }
1277 
1278 static bool parseLinkerOptionsArgs(CompilerInvocation &invoc,
1279                                    llvm::opt::ArgList &args,
1280                                    clang::DiagnosticsEngine &diags) {
1281   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1282 
1283   // TODO: support --dependent-lib on other platforms when MLIR supports
1284   //       !llvm.dependent.lib
1285   if (args.hasArg(clang::driver::options::OPT_dependent_lib) &&
1286       !triple.isOSWindows()) {
1287     const unsigned diagID =
1288         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1289                               "--dependent-lib is only supported on Windows");
1290     diags.Report(diagID);
1291     return false;
1292   }
1293 
1294   invoc.getCodeGenOpts().DependentLibs =
1295       args.getAllArgValues(clang::driver::options::OPT_dependent_lib);
1296   return true;
1297 }
1298 
1299 static bool parseLangOptionsArgs(CompilerInvocation &invoc,
1300                                  llvm::opt::ArgList &args,
1301                                  clang::DiagnosticsEngine &diags) {
1302   bool success = true;
1303 
1304   success &= parseIntegerOverflowArgs(invoc, args, diags);
1305   success &= parseFloatingPointArgs(invoc, args, diags);
1306   success &= parseVScaleArgs(invoc, args, diags);
1307 
1308   return success;
1309 }
1310 
1311 bool CompilerInvocation::createFromArgs(
1312     CompilerInvocation &invoc, llvm::ArrayRef<const char *> commandLineArgs,
1313     clang::DiagnosticsEngine &diags, const char *argv0) {
1314 
1315   bool success = true;
1316 
1317   // Set the default triple for this CompilerInvocation. This might be
1318   // overridden by users with `-triple` (see the call to `ParseTargetArgs`
1319   // below).
1320   // NOTE: Like in Clang, it would be nice to use option marshalling
1321   // for this so that the entire logic for setting-up the triple is in one
1322   // place.
1323   invoc.getTargetOpts().triple =
1324       llvm::Triple::normalize(llvm::sys::getDefaultTargetTriple());
1325 
1326   // Parse the arguments
1327   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
1328   llvm::opt::Visibility visibilityMask(clang::driver::options::FC1Option);
1329   unsigned missingArgIndex, missingArgCount;
1330   llvm::opt::InputArgList args = opts.ParseArgs(
1331       commandLineArgs, missingArgIndex, missingArgCount, visibilityMask);
1332 
1333   // Check for missing argument error.
1334   if (missingArgCount) {
1335     diags.Report(clang::diag::err_drv_missing_argument)
1336         << args.getArgString(missingArgIndex) << missingArgCount;
1337     success = false;
1338   }
1339 
1340   // Issue errors on unknown arguments
1341   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
1342     auto argString = a->getAsString(args);
1343     std::string nearest;
1344     if (opts.findNearest(argString, nearest, visibilityMask) > 1)
1345       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
1346     else
1347       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
1348           << argString << nearest;
1349     success = false;
1350   }
1351 
1352   // -flang-experimental-hlfir
1353   if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir) ||
1354       args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1355     invoc.loweringOpts.setLowerToHighLevelFIR(true);
1356   }
1357 
1358   // -flang-deprecated-no-hlfir
1359   if (args.hasArg(clang::driver::options::OPT_flang_deprecated_no_hlfir) &&
1360       !args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1361     if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir)) {
1362       const unsigned diagID = diags.getCustomDiagID(
1363           clang::DiagnosticsEngine::Error,
1364           "Options '-flang-experimental-hlfir' and "
1365           "'-flang-deprecated-no-hlfir' cannot be both specified");
1366       diags.Report(diagID);
1367     }
1368     invoc.loweringOpts.setLowerToHighLevelFIR(false);
1369   }
1370 
1371   // -fno-ppc-native-vector-element-order
1372   if (args.hasArg(clang::driver::options::OPT_fno_ppc_native_vec_elem_order)) {
1373     invoc.loweringOpts.setNoPPCNativeVecElemOrder(true);
1374   }
1375 
1376   // -f[no-]init-global-zero
1377   if (args.hasFlag(clang::driver::options::OPT_finit_global_zero,
1378                    clang::driver::options::OPT_fno_init_global_zero,
1379                    /*default=*/true))
1380     invoc.loweringOpts.setInitGlobalZero(true);
1381   else
1382     invoc.loweringOpts.setInitGlobalZero(false);
1383 
1384   // Preserve all the remark options requested, i.e. -Rpass, -Rpass-missed or
1385   // -Rpass-analysis. This will be used later when processing and outputting the
1386   // remarks generated by LLVM in ExecuteCompilerInvocation.cpp.
1387   for (auto *a : args.filtered(clang::driver::options::OPT_R_Group)) {
1388     if (a->getOption().matches(clang::driver::options::OPT_R_value_Group))
1389       // This is -Rfoo=, where foo is the name of the diagnostic
1390       // group. Add only the remark option name to the diagnostics. e.g. for
1391       // -Rpass= we will add the string "pass".
1392       invoc.getDiagnosticOpts().Remarks.push_back(
1393           std::string(a->getOption().getName().drop_front(1).rtrim("=-")));
1394     else
1395       // If no regex was provided, add the provided value, e.g. for -Rpass add
1396       // the string "pass".
1397       invoc.getDiagnosticOpts().Remarks.push_back(a->getValue());
1398   }
1399 
1400   // -frealloc-lhs is the default.
1401   if (!args.hasFlag(clang::driver::options::OPT_frealloc_lhs,
1402                     clang::driver::options::OPT_fno_realloc_lhs, true))
1403     invoc.loweringOpts.setReallocateLHS(false);
1404 
1405   success &= parseFrontendArgs(invoc.getFrontendOpts(), args, diags);
1406   parseTargetArgs(invoc.getTargetOpts(), args);
1407   parsePreprocessorArgs(invoc.getPreprocessorOpts(), args);
1408   parseCodeGenArgs(invoc.getCodeGenOpts(), args, diags);
1409   success &= parseDebugArgs(invoc.getCodeGenOpts(), args, diags);
1410   success &= parseVectorLibArg(invoc.getCodeGenOpts(), args, diags);
1411   success &= parseSemaArgs(invoc, args, diags);
1412   success &= parseDialectArgs(invoc, args, diags);
1413   success &= parseOpenMPArgs(invoc, args, diags);
1414   success &= parseDiagArgs(invoc, args, diags);
1415 
1416   // Collect LLVM (-mllvm) and MLIR (-mmlir) options.
1417   // NOTE: Try to avoid adding any options directly to `llvmArgs` or
1418   // `mlirArgs`. Instead, you can use
1419   //    * `-mllvm <your-llvm-option>`, or
1420   //    * `-mmlir <your-mlir-option>`.
1421   invoc.frontendOpts.llvmArgs =
1422       args.getAllArgValues(clang::driver::options::OPT_mllvm);
1423   invoc.frontendOpts.mlirArgs =
1424       args.getAllArgValues(clang::driver::options::OPT_mmlir);
1425 
1426   success &= parseLangOptionsArgs(invoc, args, diags);
1427 
1428   success &= parseLinkerOptionsArgs(invoc, args, diags);
1429 
1430   // Set the string to be used as the return value of the COMPILER_OPTIONS
1431   // intrinsic of iso_fortran_env. This is either passed in from the parent
1432   // compiler driver invocation with an environment variable, or failing that
1433   // set to the command line arguments of the frontend driver invocation.
1434   invoc.allCompilerInvocOpts = std::string();
1435   llvm::raw_string_ostream os(invoc.allCompilerInvocOpts);
1436   char *compilerOptsEnv = std::getenv("FLANG_COMPILER_OPTIONS_STRING");
1437   if (compilerOptsEnv != nullptr) {
1438     os << compilerOptsEnv;
1439   } else {
1440     os << argv0 << ' ';
1441     for (auto it = commandLineArgs.begin(), e = commandLineArgs.end(); it != e;
1442          ++it) {
1443       os << ' ' << *it;
1444     }
1445   }
1446 
1447   // Process the timing-related options.
1448   if (args.hasArg(clang::driver::options::OPT_ftime_report))
1449     invoc.enableTimers = true;
1450 
1451   invoc.setArgv0(argv0);
1452 
1453   return success;
1454 }
1455 
1456 void CompilerInvocation::collectMacroDefinitions() {
1457   auto &ppOpts = this->getPreprocessorOpts();
1458 
1459   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
1460     llvm::StringRef macro = ppOpts.macros[i].first;
1461     bool isUndef = ppOpts.macros[i].second;
1462 
1463     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
1464     llvm::StringRef macroName = macroPair.first;
1465     llvm::StringRef macroBody = macroPair.second;
1466 
1467     // For an #undef'd macro, we only care about the name.
1468     if (isUndef) {
1469       parserOpts.predefinitions.emplace_back(macroName.str(),
1470                                              std::optional<std::string>{});
1471       continue;
1472     }
1473 
1474     // For a #define'd macro, figure out the actual definition.
1475     if (macroName.size() == macro.size())
1476       macroBody = "1";
1477     else {
1478       // Note: GCC drops anything following an end-of-line character.
1479       llvm::StringRef::size_type end = macroBody.find_first_of("\n\r");
1480       macroBody = macroBody.substr(0, end);
1481     }
1482     parserOpts.predefinitions.emplace_back(
1483         macroName, std::optional<std::string>(macroBody.str()));
1484   }
1485 }
1486 
1487 void CompilerInvocation::setDefaultFortranOpts() {
1488   auto &fortranOptions = getFortranOpts();
1489 
1490   std::vector<std::string> searchDirectories{"."s};
1491   fortranOptions.searchDirectories = searchDirectories;
1492 
1493   // Add the location of omp_lib.h to the search directories. Currently this is
1494   // identical to the modules' directory.
1495   fortranOptions.searchDirectories.emplace_back(
1496       getOpenMPHeadersDir(getArgv0()));
1497 
1498   fortranOptions.isFixedForm = false;
1499 }
1500 
1501 // TODO: When expanding this method, consider creating a dedicated API for
1502 // this. Also at some point we will need to differentiate between different
1503 // targets and add dedicated predefines for each.
1504 void CompilerInvocation::setDefaultPredefinitions() {
1505   auto &fortranOptions = getFortranOpts();
1506   const auto &frontendOptions = getFrontendOpts();
1507   // Populate the macro list with version numbers and other predefinitions.
1508   fortranOptions.predefinitions.emplace_back("__flang__", "1");
1509   fortranOptions.predefinitions.emplace_back("__flang_major__",
1510                                              FLANG_VERSION_MAJOR_STRING);
1511   fortranOptions.predefinitions.emplace_back("__flang_minor__",
1512                                              FLANG_VERSION_MINOR_STRING);
1513   fortranOptions.predefinitions.emplace_back("__flang_patchlevel__",
1514                                              FLANG_VERSION_PATCHLEVEL_STRING);
1515 
1516   // Add predefinitions based on extensions enabled
1517   if (frontendOptions.features.IsEnabled(
1518           Fortran::common::LanguageFeature::OpenACC)) {
1519     fortranOptions.predefinitions.emplace_back("_OPENACC", "202211");
1520   }
1521   if (frontendOptions.features.IsEnabled(
1522           Fortran::common::LanguageFeature::OpenMP)) {
1523     Fortran::common::setOpenMPMacro(getLangOpts().OpenMPVersion,
1524                                     fortranOptions.predefinitions);
1525   }
1526 
1527   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1528   if (targetTriple.isPPC()) {
1529     // '__powerpc__' is a generic macro for any PowerPC cases. e.g. Max integer
1530     // size.
1531     fortranOptions.predefinitions.emplace_back("__powerpc__", "1");
1532   }
1533   if (targetTriple.isOSLinux()) {
1534     fortranOptions.predefinitions.emplace_back("__linux__", "1");
1535   }
1536 
1537   switch (targetTriple.getArch()) {
1538   default:
1539     break;
1540   case llvm::Triple::ArchType::x86_64:
1541     fortranOptions.predefinitions.emplace_back("__x86_64__", "1");
1542     fortranOptions.predefinitions.emplace_back("__x86_64", "1");
1543     break;
1544   }
1545 }
1546 
1547 void CompilerInvocation::setFortranOpts() {
1548   auto &fortranOptions = getFortranOpts();
1549   const auto &frontendOptions = getFrontendOpts();
1550   const auto &preprocessorOptions = getPreprocessorOpts();
1551   auto &moduleDirJ = getModuleDir();
1552 
1553   if (frontendOptions.fortranForm != FortranForm::Unknown) {
1554     fortranOptions.isFixedForm =
1555         frontendOptions.fortranForm == FortranForm::FixedForm;
1556   }
1557   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
1558 
1559   // -E
1560   fortranOptions.prescanAndReformat =
1561       frontendOptions.programAction == PrintPreprocessedInput;
1562 
1563   fortranOptions.features = frontendOptions.features;
1564   fortranOptions.encoding = frontendOptions.encoding;
1565 
1566   // Adding search directories specified by -I
1567   fortranOptions.searchDirectories.insert(
1568       fortranOptions.searchDirectories.end(),
1569       preprocessorOptions.searchDirectoriesFromDashI.begin(),
1570       preprocessorOptions.searchDirectoriesFromDashI.end());
1571 
1572   // Add the ordered list of -intrinsic-modules-path
1573   fortranOptions.searchDirectories.insert(
1574       fortranOptions.searchDirectories.end(),
1575       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
1576       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
1577 
1578   //  Add the default intrinsic module directory
1579   fortranOptions.intrinsicModuleDirectories.emplace_back(
1580       getIntrinsicDir(getArgv0()));
1581 
1582   // Add the directory supplied through -J/-module-dir to the list of search
1583   // directories
1584   if (moduleDirJ != ".")
1585     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
1586 
1587   if (frontendOptions.instrumentedParse)
1588     fortranOptions.instrumentedParse = true;
1589 
1590   if (frontendOptions.showColors)
1591     fortranOptions.showColors = true;
1592 
1593   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
1594     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
1595 
1596   if (getEnableConformanceChecks())
1597     fortranOptions.features.WarnOnAllNonstandard();
1598 
1599   if (getEnableUsageChecks())
1600     fortranOptions.features.WarnOnAllUsage();
1601 
1602   if (getDisableWarnings()) {
1603     fortranOptions.features.DisableAllNonstandardWarnings();
1604     fortranOptions.features.DisableAllUsageWarnings();
1605   }
1606 }
1607 
1608 std::unique_ptr<Fortran::semantics::SemanticsContext>
1609 CompilerInvocation::getSemanticsCtx(
1610     Fortran::parser::AllCookedSources &allCookedSources,
1611     const llvm::TargetMachine &targetMachine) {
1612   auto &fortranOptions = getFortranOpts();
1613 
1614   auto semanticsContext = std::make_unique<semantics::SemanticsContext>(
1615       getDefaultKinds(), fortranOptions.features, getLangOpts(),
1616       allCookedSources);
1617 
1618   semanticsContext->set_moduleDirectory(getModuleDir())
1619       .set_searchDirectories(fortranOptions.searchDirectories)
1620       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
1621       .set_warningsAreErrors(getWarnAsErr())
1622       .set_moduleFileSuffix(getModuleFileSuffix())
1623       .set_underscoring(getCodeGenOpts().Underscoring);
1624 
1625   std::string compilerVersion = Fortran::common::getFlangFullVersion();
1626   Fortran::tools::setUpTargetCharacteristics(
1627       semanticsContext->targetCharacteristics(), targetMachine, getTargetOpts(),
1628       compilerVersion, allCompilerInvocOpts);
1629   return semanticsContext;
1630 }
1631 
1632 /// Set \p loweringOptions controlling lowering behavior based
1633 /// on the \p optimizationLevel.
1634 void CompilerInvocation::setLoweringOptions() {
1635   const CodeGenOptions &codegenOpts = getCodeGenOpts();
1636 
1637   // Lower TRANSPOSE as a runtime call under -O0.
1638   loweringOpts.setOptimizeTranspose(codegenOpts.OptimizationLevel > 0);
1639   loweringOpts.setUnderscoring(codegenOpts.Underscoring);
1640 
1641   const Fortran::common::LangOptions &langOptions = getLangOpts();
1642   loweringOpts.setIntegerWrapAround(langOptions.getSignedOverflowBehavior() ==
1643                                     Fortran::common::LangOptions::SOB_Defined);
1644   Fortran::common::MathOptionsBase &mathOpts = loweringOpts.getMathOptions();
1645   // TODO: when LangOptions are finalized, we can represent
1646   //       the math related options using Fortran::commmon::MathOptionsBase,
1647   //       so that we can just copy it into LoweringOptions.
1648   mathOpts
1649       .setFPContractEnabled(langOptions.getFPContractMode() ==
1650                             Fortran::common::LangOptions::FPM_Fast)
1651       .setNoHonorInfs(langOptions.NoHonorInfs)
1652       .setNoHonorNaNs(langOptions.NoHonorNaNs)
1653       .setApproxFunc(langOptions.ApproxFunc)
1654       .setNoSignedZeros(langOptions.NoSignedZeros)
1655       .setAssociativeMath(langOptions.AssociativeMath)
1656       .setReciprocalMath(langOptions.ReciprocalMath);
1657 }
1658