xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 7211bf48a62bfe3a181013f412f2fa6e112ae99f) 
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.UnrollLoops = args.hasFlag(clang::driver::options::OPT_funroll_loops,
250                                   clang::driver::options::OPT_fno_unroll_loops,
251                                   (opts.OptimizationLevel > 1));
252 
253   opts.AliasAnalysis = opts.OptimizationLevel > 0;
254 
255   // -mframe-pointer=none/non-leaf/all option.
256   if (const llvm::opt::Arg *a =
257           args.getLastArg(clang::driver::options::OPT_mframe_pointer_EQ)) {
258     std::optional<llvm::FramePointerKind> val =
259         llvm::StringSwitch<std::optional<llvm::FramePointerKind>>(a->getValue())
260             .Case("none", llvm::FramePointerKind::None)
261             .Case("non-leaf", llvm::FramePointerKind::NonLeaf)
262             .Case("all", llvm::FramePointerKind::All)
263             .Default(std::nullopt);
264 
265     if (!val.has_value()) {
266       diags.Report(clang::diag::err_drv_invalid_value)
267           << a->getAsString(args) << a->getValue();
268     } else
269       opts.setFramePointer(val.value());
270   }
271 
272   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
273     opts.LLVMPassPlugins.push_back(a->getValue());
274 
275   // -fembed-offload-object option
276   for (auto *a :
277        args.filtered(clang::driver::options::OPT_fembed_offload_object_EQ))
278     opts.OffloadObjects.push_back(a->getValue());
279 
280   // -flto=full/thin option.
281   if (const llvm::opt::Arg *a =
282           args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
283     llvm::StringRef s = a->getValue();
284     assert((s == "full" || s == "thin") && "Unknown LTO mode.");
285     if (s == "full")
286       opts.PrepareForFullLTO = true;
287     else
288       opts.PrepareForThinLTO = true;
289   }
290 
291   if (const llvm::opt::Arg *a = args.getLastArg(
292           clang::driver::options::OPT_mcode_object_version_EQ)) {
293     llvm::StringRef s = a->getValue();
294     if (s == "6")
295       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_6;
296     if (s == "5")
297       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_5;
298     if (s == "4")
299       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_4;
300     if (s == "none")
301       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_None;
302   }
303 
304   // -f[no-]save-optimization-record[=<format>]
305   if (const llvm::opt::Arg *a =
306           args.getLastArg(clang::driver::options::OPT_opt_record_file))
307     opts.OptRecordFile = a->getValue();
308 
309   // Optimization file format. Defaults to yaml
310   if (const llvm::opt::Arg *a =
311           args.getLastArg(clang::driver::options::OPT_opt_record_format))
312     opts.OptRecordFormat = a->getValue();
313 
314   // Specifies, using a regex, which successful optimization passes(middle and
315   // backend), to include in the final optimization record file generated. If
316   // not provided -fsave-optimization-record will include all passes.
317   if (const llvm::opt::Arg *a =
318           args.getLastArg(clang::driver::options::OPT_opt_record_passes))
319     opts.OptRecordPasses = a->getValue();
320 
321   // Create OptRemark that allows printing of all successful optimization
322   // passes applied.
323   opts.OptimizationRemark =
324       parseOptimizationRemark(diags, args, clang::driver::options::OPT_Rpass_EQ,
325                               /*remarkOptName=*/"pass");
326 
327   // Create OptRemark that allows all missed optimization passes to be printed.
328   opts.OptimizationRemarkMissed = parseOptimizationRemark(
329       diags, args, clang::driver::options::OPT_Rpass_missed_EQ,
330       /*remarkOptName=*/"pass-missed");
331 
332   // Create OptRemark that allows all optimization decisions made by LLVM
333   // to be printed.
334   opts.OptimizationRemarkAnalysis = parseOptimizationRemark(
335       diags, args, clang::driver::options::OPT_Rpass_analysis_EQ,
336       /*remarkOptName=*/"pass-analysis");
337 
338   if (opts.getDebugInfo() == llvm::codegenoptions::NoDebugInfo) {
339     // If the user requested a flag that requires source locations available in
340     // the backend, make sure that the backend tracks source location
341     // information.
342     bool needLocTracking = !opts.OptRecordFile.empty() ||
343                            !opts.OptRecordPasses.empty() ||
344                            !opts.OptRecordFormat.empty() ||
345                            opts.OptimizationRemark.hasValidPattern() ||
346                            opts.OptimizationRemarkMissed.hasValidPattern() ||
347                            opts.OptimizationRemarkAnalysis.hasValidPattern();
348 
349     if (needLocTracking)
350       opts.setDebugInfo(llvm::codegenoptions::LocTrackingOnly);
351   }
352 
353   if (auto *a = args.getLastArg(clang::driver::options::OPT_save_temps_EQ))
354     opts.SaveTempsDir = a->getValue();
355 
356   // -record-command-line option.
357   if (const llvm::opt::Arg *a =
358           args.getLastArg(clang::driver::options::OPT_record_command_line)) {
359     opts.RecordCommandLine = a->getValue();
360   }
361 
362   // -mlink-builtin-bitcode
363   for (auto *a :
364        args.filtered(clang::driver::options::OPT_mlink_builtin_bitcode))
365     opts.BuiltinBCLibs.push_back(a->getValue());
366 
367   // -mrelocation-model option.
368   if (const llvm::opt::Arg *a =
369           args.getLastArg(clang::driver::options::OPT_mrelocation_model)) {
370     llvm::StringRef modelName = a->getValue();
371     auto relocModel =
372         llvm::StringSwitch<std::optional<llvm::Reloc::Model>>(modelName)
373             .Case("static", llvm::Reloc::Static)
374             .Case("pic", llvm::Reloc::PIC_)
375             .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
376             .Case("ropi", llvm::Reloc::ROPI)
377             .Case("rwpi", llvm::Reloc::RWPI)
378             .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
379             .Default(std::nullopt);
380     if (relocModel.has_value())
381       opts.setRelocationModel(*relocModel);
382     else
383       diags.Report(clang::diag::err_drv_invalid_value)
384           << a->getAsString(args) << modelName;
385   }
386 
387   // -pic-level and -pic-is-pie option.
388   if (int picLevel = getLastArgIntValue(
389           args, clang::driver::options::OPT_pic_level, 0, diags)) {
390     if (picLevel > 2)
391       diags.Report(clang::diag::err_drv_invalid_value)
392           << args.getLastArg(clang::driver::options::OPT_pic_level)
393                  ->getAsString(args)
394           << picLevel;
395 
396     opts.PICLevel = picLevel;
397     if (args.hasArg(clang::driver::options::OPT_pic_is_pie))
398       opts.IsPIE = 1;
399   }
400 
401   // -mcmodel option.
402   if (const llvm::opt::Arg *a =
403           args.getLastArg(clang::driver::options::OPT_mcmodel_EQ)) {
404     llvm::StringRef modelName = a->getValue();
405     std::optional<llvm::CodeModel::Model> codeModel = getCodeModel(modelName);
406 
407     if (codeModel.has_value())
408       opts.CodeModel = modelName;
409     else
410       diags.Report(clang::diag::err_drv_invalid_value)
411           << a->getAsString(args) << modelName;
412   }
413 
414   if (const llvm::opt::Arg *arg = args.getLastArg(
415           clang::driver::options::OPT_mlarge_data_threshold_EQ)) {
416     uint64_t LDT;
417     if (llvm::StringRef(arg->getValue()).getAsInteger(/*Radix=*/10, LDT)) {
418       diags.Report(clang::diag::err_drv_invalid_value)
419           << arg->getSpelling() << arg->getValue();
420     }
421     opts.LargeDataThreshold = LDT;
422   }
423 
424   // This option is compatible with -f[no-]underscoring in gfortran.
425   if (args.hasFlag(clang::driver::options::OPT_fno_underscoring,
426                    clang::driver::options::OPT_funderscoring, false)) {
427     opts.Underscoring = 0;
428   }
429 }
430 
431 /// Parses all target input arguments and populates the target
432 /// options accordingly.
433 ///
434 /// \param [in] opts The target options instance to update
435 /// \param [in] args The list of input arguments (from the compiler invocation)
436 static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
437   if (const llvm::opt::Arg *a =
438           args.getLastArg(clang::driver::options::OPT_triple))
439     opts.triple = a->getValue();
440 
441   if (const llvm::opt::Arg *a =
442           args.getLastArg(clang::driver::options::OPT_target_cpu))
443     opts.cpu = a->getValue();
444 
445   if (const llvm::opt::Arg *a =
446           args.getLastArg(clang::driver::options::OPT_tune_cpu))
447     opts.cpuToTuneFor = a->getValue();
448 
449   for (const llvm::opt::Arg *currentArg :
450        args.filtered(clang::driver::options::OPT_target_feature))
451     opts.featuresAsWritten.emplace_back(currentArg->getValue());
452 
453   if (args.hasArg(clang::driver::options::OPT_fdisable_real_10))
454     opts.disabledRealKinds.push_back(10);
455 
456   if (args.hasArg(clang::driver::options::OPT_fdisable_real_3))
457     opts.disabledRealKinds.push_back(3);
458 
459   if (args.hasArg(clang::driver::options::OPT_fdisable_integer_2))
460     opts.disabledIntegerKinds.push_back(2);
461 
462   if (args.hasArg(clang::driver::options::OPT_fdisable_integer_16))
463     opts.disabledIntegerKinds.push_back(16);
464 
465   if (const llvm::opt::Arg *a =
466           args.getLastArg(clang::driver::options::OPT_mabi_EQ)) {
467     llvm::StringRef V = a->getValue();
468     if (V == "vec-extabi") {
469       opts.EnableAIXExtendedAltivecABI = true;
470     } else if (V == "vec-default") {
471       opts.EnableAIXExtendedAltivecABI = false;
472     }
473   }
474 }
475 // Tweak the frontend configuration based on the frontend action
476 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
477   if (opts.programAction == DebugDumpParsingLog)
478     opts.instrumentedParse = true;
479 
480   if (opts.programAction == DebugDumpProvenance ||
481       opts.programAction == Fortran::frontend::GetDefinition)
482     opts.needProvenanceRangeToCharBlockMappings = true;
483 }
484 
485 /// Parse the argument specified for the -fconvert=<value> option
486 static std::optional<const char *> parseConvertArg(const char *s) {
487   return llvm::StringSwitch<std::optional<const char *>>(s)
488       .Case("unknown", "UNKNOWN")
489       .Case("native", "NATIVE")
490       .Case("little-endian", "LITTLE_ENDIAN")
491       .Case("big-endian", "BIG_ENDIAN")
492       .Case("swap", "SWAP")
493       .Default(std::nullopt);
494 }
495 
496 static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
497                               clang::DiagnosticsEngine &diags) {
498   unsigned numErrorsBefore = diags.getNumErrors();
499 
500   // By default the frontend driver creates a ParseSyntaxOnly action.
501   opts.programAction = ParseSyntaxOnly;
502 
503   // Treat multiple action options as an invocation error. Note that `clang
504   // -cc1` does accept multiple action options, but will only consider the
505   // rightmost one.
506   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
507     const unsigned diagID = diags.getCustomDiagID(
508         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
509     diags.Report(diagID);
510     return false;
511   }
512 
513   // Identify the action (i.e. opts.ProgramAction)
514   if (const llvm::opt::Arg *a =
515           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
516     switch (a->getOption().getID()) {
517     default: {
518       llvm_unreachable("Invalid option in group!");
519     }
520     case clang::driver::options::OPT_test_io:
521       opts.programAction = InputOutputTest;
522       break;
523     case clang::driver::options::OPT_E:
524       opts.programAction = PrintPreprocessedInput;
525       break;
526     case clang::driver::options::OPT_fsyntax_only:
527       opts.programAction = ParseSyntaxOnly;
528       break;
529     case clang::driver::options::OPT_emit_fir:
530       opts.programAction = EmitFIR;
531       break;
532     case clang::driver::options::OPT_emit_hlfir:
533       opts.programAction = EmitHLFIR;
534       break;
535     case clang::driver::options::OPT_emit_llvm:
536       opts.programAction = EmitLLVM;
537       break;
538     case clang::driver::options::OPT_emit_llvm_bc:
539       opts.programAction = EmitLLVMBitcode;
540       break;
541     case clang::driver::options::OPT_emit_obj:
542       opts.programAction = EmitObj;
543       break;
544     case clang::driver::options::OPT_S:
545       opts.programAction = EmitAssembly;
546       break;
547     case clang::driver::options::OPT_fdebug_unparse:
548       opts.programAction = DebugUnparse;
549       break;
550     case clang::driver::options::OPT_fdebug_unparse_no_sema:
551       opts.programAction = DebugUnparseNoSema;
552       break;
553     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
554       opts.programAction = DebugUnparseWithSymbols;
555       break;
556     case clang::driver::options::OPT_fdebug_unparse_with_modules:
557       opts.programAction = DebugUnparseWithModules;
558       break;
559     case clang::driver::options::OPT_fdebug_dump_symbols:
560       opts.programAction = DebugDumpSymbols;
561       break;
562     case clang::driver::options::OPT_fdebug_dump_parse_tree:
563       opts.programAction = DebugDumpParseTree;
564       break;
565     case clang::driver::options::OPT_fdebug_dump_pft:
566       opts.programAction = DebugDumpPFT;
567       break;
568     case clang::driver::options::OPT_fdebug_dump_all:
569       opts.programAction = DebugDumpAll;
570       break;
571     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
572       opts.programAction = DebugDumpParseTreeNoSema;
573       break;
574     case clang::driver::options::OPT_fdebug_dump_provenance:
575       opts.programAction = DebugDumpProvenance;
576       break;
577     case clang::driver::options::OPT_fdebug_dump_parsing_log:
578       opts.programAction = DebugDumpParsingLog;
579       break;
580     case clang::driver::options::OPT_fdebug_measure_parse_tree:
581       opts.programAction = DebugMeasureParseTree;
582       break;
583     case clang::driver::options::OPT_fdebug_pre_fir_tree:
584       opts.programAction = DebugPreFIRTree;
585       break;
586     case clang::driver::options::OPT_fget_symbols_sources:
587       opts.programAction = GetSymbolsSources;
588       break;
589     case clang::driver::options::OPT_fget_definition:
590       opts.programAction = GetDefinition;
591       break;
592     case clang::driver::options::OPT_init_only:
593       opts.programAction = InitOnly;
594       break;
595 
596       // TODO:
597       // case clang::driver::options::OPT_emit_llvm:
598       // case clang::driver::options::OPT_emit_llvm_only:
599       // case clang::driver::options::OPT_emit_codegen_only:
600       // case clang::driver::options::OPT_emit_module:
601       // (...)
602     }
603 
604     // Parse the values provided with `-fget-definition` (there should be 3
605     // integers)
606     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
607         clang::driver::options::OPT_fget_definition) {
608       unsigned optVals[3] = {0, 0, 0};
609 
610       for (unsigned i = 0; i < 3; i++) {
611         llvm::StringRef val = a->getValue(i);
612 
613         if (val.getAsInteger(10, optVals[i])) {
614           // A non-integer was encountered - that's an error.
615           diags.Report(clang::diag::err_drv_invalid_value)
616               << a->getOption().getName() << val;
617           break;
618         }
619       }
620       opts.getDefVals.line = optVals[0];
621       opts.getDefVals.startColumn = optVals[1];
622       opts.getDefVals.endColumn = optVals[2];
623     }
624   }
625 
626   // Parsing -load <dsopath> option and storing shared object path
627   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
628     opts.plugins.push_back(a->getValue());
629   }
630 
631   // Parsing -plugin <name> option and storing plugin name and setting action
632   if (const llvm::opt::Arg *a =
633           args.getLastArg(clang::driver::options::OPT_plugin)) {
634     opts.programAction = PluginAction;
635     opts.actionName = a->getValue();
636   }
637 
638   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
639   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
640   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
641   opts.printSupportedCPUs =
642       args.hasArg(clang::driver::options::OPT_print_supported_cpus);
643 
644   // Get the input kind (from the value passed via `-x`)
645   InputKind dashX(Language::Unknown);
646   if (const llvm::opt::Arg *a =
647           args.getLastArg(clang::driver::options::OPT_x)) {
648     llvm::StringRef xValue = a->getValue();
649     // Principal languages.
650     dashX = llvm::StringSwitch<InputKind>(xValue)
651                 // Flang does not differentiate between pre-processed and not
652                 // pre-processed inputs.
653                 .Case("f95", Language::Fortran)
654                 .Case("f95-cpp-input", Language::Fortran)
655                 // CUDA Fortran
656                 .Case("cuda", Language::Fortran)
657                 .Default(Language::Unknown);
658 
659     // Flang's intermediate representations.
660     if (dashX.isUnknown())
661       dashX = llvm::StringSwitch<InputKind>(xValue)
662                   .Case("ir", Language::LLVM_IR)
663                   .Case("fir", Language::MLIR)
664                   .Case("mlir", Language::MLIR)
665                   .Default(Language::Unknown);
666 
667     if (dashX.isUnknown())
668       diags.Report(clang::diag::err_drv_invalid_value)
669           << a->getAsString(args) << a->getValue();
670   }
671 
672   // Collect the input files and save them in our instance of FrontendOptions.
673   std::vector<std::string> inputs =
674       args.getAllArgValues(clang::driver::options::OPT_INPUT);
675   opts.inputs.clear();
676   if (inputs.empty())
677     // '-' is the default input if none is given.
678     inputs.push_back("-");
679   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
680     InputKind ik = dashX;
681     if (ik.isUnknown()) {
682       ik = FrontendOptions::getInputKindForExtension(
683           llvm::StringRef(inputs[i]).rsplit('.').second);
684       if (ik.isUnknown())
685         ik = Language::Unknown;
686       if (i == 0)
687         dashX = ik;
688     }
689 
690     opts.inputs.emplace_back(std::move(inputs[i]), ik);
691   }
692 
693   // Set fortranForm based on options -ffree-form and -ffixed-form.
694   if (const auto *arg =
695           args.getLastArg(clang::driver::options::OPT_ffixed_form,
696                           clang::driver::options::OPT_ffree_form)) {
697     opts.fortranForm =
698         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
699             ? FortranForm::FixedForm
700             : FortranForm::FreeForm;
701   }
702 
703   // Set fixedFormColumns based on -ffixed-line-length=<value>
704   if (const auto *arg =
705           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
706     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
707     std::int64_t columns = -1;
708     if (argValue == "none") {
709       columns = 0;
710     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
711       columns = -1;
712     }
713     if (columns < 0) {
714       diags.Report(clang::diag::err_drv_negative_columns)
715           << arg->getOption().getName() << arg->getValue();
716     } else if (columns == 0) {
717       opts.fixedFormColumns = 1000000;
718     } else if (columns < 7) {
719       diags.Report(clang::diag::err_drv_small_columns)
720           << arg->getOption().getName() << arg->getValue() << "7";
721     } else {
722       opts.fixedFormColumns = columns;
723     }
724   }
725 
726   // Set conversion based on -fconvert=<value>
727   if (const auto *arg =
728           args.getLastArg(clang::driver::options::OPT_fconvert_EQ)) {
729     const char *argValue = arg->getValue();
730     if (auto convert = parseConvertArg(argValue))
731       opts.envDefaults.push_back({"FORT_CONVERT", *convert});
732     else
733       diags.Report(clang::diag::err_drv_invalid_value)
734           << arg->getAsString(args) << argValue;
735   }
736 
737   // -f{no-}implicit-none
738   opts.features.Enable(
739       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
740       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
741                    clang::driver::options::OPT_fno_implicit_none, false));
742 
743   // -f{no-}backslash
744   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
745                        args.hasFlag(clang::driver::options::OPT_fbackslash,
746                                     clang::driver::options::OPT_fno_backslash,
747                                     false));
748 
749   // -f{no-}logical-abbreviations
750   opts.features.Enable(
751       Fortran::common::LanguageFeature::LogicalAbbreviations,
752       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
753                    clang::driver::options::OPT_fno_logical_abbreviations,
754                    false));
755 
756   // -f{no-}unsigned
757   opts.features.Enable(Fortran::common::LanguageFeature::Unsigned,
758                        args.hasFlag(clang::driver::options::OPT_funsigned,
759                                     clang::driver::options::OPT_fno_unsigned,
760                                     false));
761 
762   // -f{no-}xor-operator
763   opts.features.Enable(
764       Fortran::common::LanguageFeature::XOROperator,
765       args.hasFlag(clang::driver::options::OPT_fxor_operator,
766                    clang::driver::options::OPT_fno_xor_operator, false));
767 
768   // -fno-automatic
769   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
770     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
771   }
772 
773   // -f{no}-save-main-program
774   opts.features.Enable(
775       Fortran::common::LanguageFeature::SaveMainProgram,
776       args.hasFlag(clang::driver::options::OPT_fsave_main_program,
777                    clang::driver::options::OPT_fno_save_main_program, false));
778 
779   if (args.hasArg(
780           clang::driver::options::OPT_falternative_parameter_statement)) {
781     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
782   }
783   if (const llvm::opt::Arg *arg =
784           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
785     llvm::StringRef argValue = arg->getValue();
786     if (argValue == "utf-8") {
787       opts.encoding = Fortran::parser::Encoding::UTF_8;
788     } else if (argValue == "latin-1") {
789       opts.encoding = Fortran::parser::Encoding::LATIN_1;
790     } else {
791       diags.Report(clang::diag::err_drv_invalid_value)
792           << arg->getAsString(args) << argValue;
793     }
794   }
795 
796   setUpFrontendBasedOnAction(opts);
797   opts.dashX = dashX;
798 
799   return diags.getNumErrors() == numErrorsBefore;
800 }
801 
802 // Generate the path to look for intrinsic modules
803 static std::string getIntrinsicDir(const char *argv) {
804   // TODO: Find a system independent API
805   llvm::SmallString<128> driverPath;
806   driverPath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
807   llvm::sys::path::remove_filename(driverPath);
808   driverPath.append("/../include/flang/");
809   return std::string(driverPath);
810 }
811 
812 // Generate the path to look for OpenMP headers
813 static std::string getOpenMPHeadersDir(const char *argv) {
814   llvm::SmallString<128> includePath;
815   includePath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
816   llvm::sys::path::remove_filename(includePath);
817   includePath.append("/../include/flang/OpenMP/");
818   return std::string(includePath);
819 }
820 
821 /// Parses all preprocessor input arguments and populates the preprocessor
822 /// options accordingly.
823 ///
824 /// \param [in] opts The preprocessor options instance
825 /// \param [out] args The list of input arguments
826 static void parsePreprocessorArgs(Fortran::frontend::PreprocessorOptions &opts,
827                                   llvm::opt::ArgList &args) {
828   // Add macros from the command line.
829   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_D,
830                                               clang::driver::options::OPT_U)) {
831     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
832       opts.addMacroDef(currentArg->getValue());
833     } else {
834       opts.addMacroUndef(currentArg->getValue());
835     }
836   }
837 
838   // Add the ordered list of -I's.
839   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
840     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
841 
842   // Prepend the ordered list of -intrinsic-modules-path
843   // to the default location to search.
844   for (const auto *currentArg :
845        args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
846     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
847 
848   // -cpp/-nocpp
849   if (const auto *currentArg = args.getLastArg(
850           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
851     opts.macrosFlag =
852         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
853             ? PPMacrosFlag::Include
854             : PPMacrosFlag::Exclude;
855 
856   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
857   opts.preprocessIncludeLines =
858       args.hasArg(clang::driver::options::OPT_fpreprocess_include_lines);
859   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
860   opts.showMacros = args.hasArg(clang::driver::options::OPT_dM);
861 }
862 
863 /// Parses all semantic related arguments and populates the variables
864 /// options accordingly. Returns false if new errors are generated.
865 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
866                           clang::DiagnosticsEngine &diags) {
867   unsigned numErrorsBefore = diags.getNumErrors();
868 
869   // -J/module-dir option
870   std::vector<std::string> moduleDirList =
871       args.getAllArgValues(clang::driver::options::OPT_module_dir);
872   // User can only specify one -J/-module-dir directory, but may repeat
873   // -J/-module-dir as long as the directory is the same each time.
874   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
875   std::sort(moduleDirList.begin(), moduleDirList.end());
876   moduleDirList.erase(std::unique(moduleDirList.begin(), moduleDirList.end()),
877                       moduleDirList.end());
878   if (moduleDirList.size() > 1) {
879     const unsigned diagID =
880         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
881                               "Only one '-module-dir/-J' directory allowed. "
882                               "'-module-dir/-J' may be given multiple times "
883                               "but the directory must be the same each time.");
884     diags.Report(diagID);
885   }
886   if (moduleDirList.size() == 1)
887     res.setModuleDir(moduleDirList[0]);
888 
889   // -fdebug-module-writer option
890   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
891     res.setDebugModuleDir(true);
892   }
893 
894   // -fhermetic-module-files option
895   if (args.hasArg(clang::driver::options::OPT_fhermetic_module_files)) {
896     res.setHermeticModuleFileOutput(true);
897   }
898 
899   // -module-suffix
900   if (const auto *moduleSuffix =
901           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
902     res.setModuleFileSuffix(moduleSuffix->getValue());
903   }
904 
905   // -f{no-}analyzed-objects-for-unparse
906   res.setUseAnalyzedObjectsForUnparse(args.hasFlag(
907       clang::driver::options::OPT_fanalyzed_objects_for_unparse,
908       clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
909 
910   return diags.getNumErrors() == numErrorsBefore;
911 }
912 
913 /// Parses all diagnostics related arguments and populates the variables
914 /// options accordingly. Returns false if new errors are generated.
915 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
916                           clang::DiagnosticsEngine &diags) {
917   unsigned numErrorsBefore = diags.getNumErrors();
918 
919   // -Werror option
920   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
921   // this has to change when other -W<opt>'s are supported.
922   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
923     const auto &wArgs =
924         args.getAllArgValues(clang::driver::options::OPT_W_Joined);
925     for (const auto &wArg : wArgs) {
926       if (wArg == "error") {
927         res.setWarnAsErr(true);
928       } else {
929         const unsigned diagID =
930             diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
931                                   "Only `-Werror` is supported currently.");
932         diags.Report(diagID);
933       }
934     }
935   }
936 
937   // Default to off for `flang -fc1`.
938   res.getFrontendOpts().showColors =
939       parseShowColorsArgs(args, /*defaultDiagColor=*/false);
940 
941   // Honor color diagnostics.
942   res.getDiagnosticOpts().ShowColors = res.getFrontendOpts().showColors;
943 
944   return diags.getNumErrors() == numErrorsBefore;
945 }
946 
947 /// Parses all Dialect related arguments and populates the variables
948 /// options accordingly. Returns false if new errors are generated.
949 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
950                              clang::DiagnosticsEngine &diags) {
951   unsigned numErrorsBefore = diags.getNumErrors();
952 
953   // -fdefault* family
954   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
955     res.getDefaultKinds().set_defaultRealKind(8);
956     res.getDefaultKinds().set_doublePrecisionKind(16);
957   }
958   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
959     res.getDefaultKinds().set_defaultIntegerKind(8);
960     res.getDefaultKinds().set_subscriptIntegerKind(8);
961     res.getDefaultKinds().set_sizeIntegerKind(8);
962     res.getDefaultKinds().set_defaultLogicalKind(8);
963   }
964   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
965     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
966       // -fdefault-double-8 has to be used with -fdefault-real-8
967       // to be compatible with gfortran
968       const unsigned diagID = diags.getCustomDiagID(
969           clang::DiagnosticsEngine::Error,
970           "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
971       diags.Report(diagID);
972     }
973     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
974     res.getDefaultKinds().set_doublePrecisionKind(8);
975   }
976   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
977     res.getDefaultKinds().set_sizeIntegerKind(8);
978 
979   // -x cuda
980   auto language = args.getLastArgValue(clang::driver::options::OPT_x);
981   if (language == "cuda") {
982     res.getFrontendOpts().features.Enable(
983         Fortran::common::LanguageFeature::CUDA);
984   }
985 
986   // -fopenacc
987   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
988     res.getFrontendOpts().features.Enable(
989         Fortran::common::LanguageFeature::OpenACC);
990   }
991 
992   // -pedantic
993   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
994     res.setEnableConformanceChecks();
995     res.setEnableUsageChecks();
996   }
997 
998   // -w
999   if (args.hasArg(clang::driver::options::OPT_w))
1000     res.setDisableWarnings();
1001 
1002   // -std=f2018
1003   // TODO: Set proper options when more fortran standards
1004   // are supported.
1005   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
1006     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
1007     // We only allow f2018 as the given standard
1008     if (standard == "f2018") {
1009       res.setEnableConformanceChecks();
1010     } else {
1011       const unsigned diagID =
1012           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1013                                 "Only -std=f2018 is allowed currently.");
1014       diags.Report(diagID);
1015     }
1016   }
1017   return diags.getNumErrors() == numErrorsBefore;
1018 }
1019 
1020 /// Parses all OpenMP related arguments if the -fopenmp option is present,
1021 /// populating the \c res object accordingly. Returns false if new errors are
1022 /// generated.
1023 static bool parseOpenMPArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
1024                             clang::DiagnosticsEngine &diags) {
1025   llvm::opt::Arg *arg = args.getLastArg(clang::driver::options::OPT_fopenmp,
1026                                         clang::driver::options::OPT_fno_openmp);
1027   if (!arg || arg->getOption().matches(clang::driver::options::OPT_fno_openmp))
1028     return true;
1029 
1030   unsigned numErrorsBefore = diags.getNumErrors();
1031   llvm::Triple t(res.getTargetOpts().triple);
1032 
1033   // By default OpenMP is set to 1.1 version
1034   res.getLangOpts().OpenMPVersion = 11;
1035   res.getFrontendOpts().features.Enable(
1036       Fortran::common::LanguageFeature::OpenMP);
1037   if (int Version = getLastArgIntValue(
1038           args, clang::driver::options::OPT_fopenmp_version_EQ,
1039           res.getLangOpts().OpenMPVersion, diags)) {
1040     res.getLangOpts().OpenMPVersion = Version;
1041   }
1042   if (args.hasArg(clang::driver::options::OPT_fopenmp_force_usm)) {
1043     res.getLangOpts().OpenMPForceUSM = 1;
1044   }
1045   if (args.hasArg(clang::driver::options::OPT_fopenmp_is_target_device)) {
1046     res.getLangOpts().OpenMPIsTargetDevice = 1;
1047 
1048     // Get OpenMP host file path if any and report if a non existent file is
1049     // found
1050     if (auto *arg = args.getLastArg(
1051             clang::driver::options::OPT_fopenmp_host_ir_file_path)) {
1052       res.getLangOpts().OMPHostIRFile = arg->getValue();
1053       if (!llvm::sys::fs::exists(res.getLangOpts().OMPHostIRFile))
1054         diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
1055             << res.getLangOpts().OMPHostIRFile;
1056     }
1057 
1058     if (args.hasFlag(
1059             clang::driver::options::OPT_fopenmp_assume_teams_oversubscription,
1060             clang::driver::options::
1061                 OPT_fno_openmp_assume_teams_oversubscription,
1062             /*Default=*/false))
1063       res.getLangOpts().OpenMPTeamSubscription = true;
1064 
1065     if (args.hasArg(clang::driver::options::OPT_fopenmp_assume_no_thread_state))
1066       res.getLangOpts().OpenMPNoThreadState = 1;
1067 
1068     if (args.hasArg(
1069             clang::driver::options::OPT_fopenmp_assume_no_nested_parallelism))
1070       res.getLangOpts().OpenMPNoNestedParallelism = 1;
1071 
1072     if (args.hasFlag(
1073             clang::driver::options::OPT_fopenmp_assume_threads_oversubscription,
1074             clang::driver::options::
1075                 OPT_fno_openmp_assume_threads_oversubscription,
1076             /*Default=*/false))
1077       res.getLangOpts().OpenMPThreadSubscription = true;
1078 
1079     if ((args.hasArg(clang::driver::options::OPT_fopenmp_target_debug) ||
1080          args.hasArg(clang::driver::options::OPT_fopenmp_target_debug_EQ))) {
1081       res.getLangOpts().OpenMPTargetDebug = getLastArgIntValue(
1082           args, clang::driver::options::OPT_fopenmp_target_debug_EQ,
1083           res.getLangOpts().OpenMPTargetDebug, diags);
1084 
1085       if (!res.getLangOpts().OpenMPTargetDebug &&
1086           args.hasArg(clang::driver::options::OPT_fopenmp_target_debug))
1087         res.getLangOpts().OpenMPTargetDebug = 1;
1088     }
1089     if (args.hasArg(clang::driver::options::OPT_nogpulib))
1090       res.getLangOpts().NoGPULib = 1;
1091   }
1092 
1093   switch (llvm::Triple(res.getTargetOpts().triple).getArch()) {
1094   case llvm::Triple::nvptx:
1095   case llvm::Triple::nvptx64:
1096   case llvm::Triple::amdgcn:
1097     if (!res.getLangOpts().OpenMPIsTargetDevice) {
1098       const unsigned diagID = diags.getCustomDiagID(
1099           clang::DiagnosticsEngine::Error,
1100           "OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
1101       diags.Report(diagID);
1102     }
1103     res.getLangOpts().OpenMPIsGPU = 1;
1104     break;
1105   default:
1106     res.getLangOpts().OpenMPIsGPU = 0;
1107     break;
1108   }
1109 
1110   // Get the OpenMP target triples if any.
1111   if (auto *arg =
1112           args.getLastArg(clang::driver::options::OPT_fopenmp_targets_EQ)) {
1113     enum ArchPtrSize { Arch16Bit, Arch32Bit, Arch64Bit };
1114     auto getArchPtrSize = [](const llvm::Triple &triple) {
1115       if (triple.isArch16Bit())
1116         return Arch16Bit;
1117       if (triple.isArch32Bit())
1118         return Arch32Bit;
1119       assert(triple.isArch64Bit() && "Expected 64-bit architecture");
1120       return Arch64Bit;
1121     };
1122 
1123     for (unsigned i = 0; i < arg->getNumValues(); ++i) {
1124       llvm::Triple tt(arg->getValue(i));
1125 
1126       if (tt.getArch() == llvm::Triple::UnknownArch ||
1127           !(tt.getArch() == llvm::Triple::aarch64 || tt.isPPC() ||
1128             tt.getArch() == llvm::Triple::systemz ||
1129             tt.getArch() == llvm::Triple::nvptx ||
1130             tt.getArch() == llvm::Triple::nvptx64 ||
1131             tt.getArch() == llvm::Triple::amdgcn ||
1132             tt.getArch() == llvm::Triple::x86 ||
1133             tt.getArch() == llvm::Triple::x86_64))
1134         diags.Report(clang::diag::err_drv_invalid_omp_target)
1135             << arg->getValue(i);
1136       else if (getArchPtrSize(t) != getArchPtrSize(tt))
1137         diags.Report(clang::diag::err_drv_incompatible_omp_arch)
1138             << arg->getValue(i) << t.str();
1139       else
1140         res.getLangOpts().OMPTargetTriples.push_back(tt);
1141     }
1142   }
1143   return diags.getNumErrors() == numErrorsBefore;
1144 }
1145 
1146 /// Parses signed integer overflow options and populates the
1147 /// CompilerInvocation accordingly.
1148 /// Returns false if new errors are generated.
1149 ///
1150 /// \param [out] invoc Stores the processed arguments
1151 /// \param [in] args The compiler invocation arguments to parse
1152 /// \param [out] diags DiagnosticsEngine to report erros with
1153 static bool parseIntegerOverflowArgs(CompilerInvocation &invoc,
1154                                      llvm::opt::ArgList &args,
1155                                      clang::DiagnosticsEngine &diags) {
1156   Fortran::common::LangOptions &opts = invoc.getLangOpts();
1157 
1158   if (args.getLastArg(clang::driver::options::OPT_fwrapv))
1159     opts.setSignedOverflowBehavior(Fortran::common::LangOptions::SOB_Defined);
1160 
1161   return true;
1162 }
1163 
1164 /// Parses all floating point related arguments and populates the
1165 /// CompilerInvocation accordingly.
1166 /// Returns false if new errors are generated.
1167 ///
1168 /// \param [out] invoc Stores the processed arguments
1169 /// \param [in] args The compiler invocation arguments to parse
1170 /// \param [out] diags DiagnosticsEngine to report erros with
1171 static bool parseFloatingPointArgs(CompilerInvocation &invoc,
1172                                    llvm::opt::ArgList &args,
1173                                    clang::DiagnosticsEngine &diags) {
1174   Fortran::common::LangOptions &opts = invoc.getLangOpts();
1175 
1176   if (const llvm::opt::Arg *a =
1177           args.getLastArg(clang::driver::options::OPT_ffp_contract)) {
1178     const llvm::StringRef val = a->getValue();
1179     enum Fortran::common::LangOptions::FPModeKind fpContractMode;
1180 
1181     if (val == "off")
1182       fpContractMode = Fortran::common::LangOptions::FPM_Off;
1183     else if (val == "fast")
1184       fpContractMode = Fortran::common::LangOptions::FPM_Fast;
1185     else {
1186       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1187           << a->getSpelling() << val;
1188       return false;
1189     }
1190 
1191     opts.setFPContractMode(fpContractMode);
1192   }
1193 
1194   if (args.getLastArg(clang::driver::options::OPT_menable_no_infs)) {
1195     opts.NoHonorInfs = true;
1196   }
1197 
1198   if (args.getLastArg(clang::driver::options::OPT_menable_no_nans)) {
1199     opts.NoHonorNaNs = true;
1200   }
1201 
1202   if (args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
1203     opts.ApproxFunc = true;
1204   }
1205 
1206   if (args.getLastArg(clang::driver::options::OPT_fno_signed_zeros)) {
1207     opts.NoSignedZeros = true;
1208   }
1209 
1210   if (args.getLastArg(clang::driver::options::OPT_mreassociate)) {
1211     opts.AssociativeMath = true;
1212   }
1213 
1214   if (args.getLastArg(clang::driver::options::OPT_freciprocal_math)) {
1215     opts.ReciprocalMath = true;
1216   }
1217 
1218   if (args.getLastArg(clang::driver::options::OPT_ffast_math)) {
1219     opts.NoHonorInfs = true;
1220     opts.NoHonorNaNs = true;
1221     opts.AssociativeMath = true;
1222     opts.ReciprocalMath = true;
1223     opts.ApproxFunc = true;
1224     opts.NoSignedZeros = true;
1225     opts.setFPContractMode(Fortran::common::LangOptions::FPM_Fast);
1226   }
1227 
1228   return true;
1229 }
1230 
1231 /// Parses vscale range options and populates the CompilerInvocation
1232 /// accordingly.
1233 /// Returns false if new errors are generated.
1234 ///
1235 /// \param [out] invoc Stores the processed arguments
1236 /// \param [in] args The compiler invocation arguments to parse
1237 /// \param [out] diags DiagnosticsEngine to report erros with
1238 static bool parseVScaleArgs(CompilerInvocation &invoc, llvm::opt::ArgList &args,
1239                             clang::DiagnosticsEngine &diags) {
1240   const auto *vscaleMin =
1241       args.getLastArg(clang::driver::options::OPT_mvscale_min_EQ);
1242   const auto *vscaleMax =
1243       args.getLastArg(clang::driver::options::OPT_mvscale_max_EQ);
1244 
1245   if (!vscaleMin && !vscaleMax)
1246     return true;
1247 
1248   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1249   if (!triple.isAArch64() && !triple.isRISCV()) {
1250     const unsigned diagID =
1251         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1252                               "`-mvscale-max` and `-mvscale-min` are not "
1253                               "supported for this architecture: %0");
1254     diags.Report(diagID) << triple.getArchName();
1255     return false;
1256   }
1257 
1258   Fortran::common::LangOptions &opts = invoc.getLangOpts();
1259   if (vscaleMin) {
1260     llvm::StringRef argValue = llvm::StringRef(vscaleMin->getValue());
1261     unsigned vscaleMinVal;
1262     if (argValue.getAsInteger(/*Radix=*/10, vscaleMinVal)) {
1263       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1264           << vscaleMax->getSpelling() << argValue;
1265       return false;
1266     }
1267     opts.VScaleMin = vscaleMinVal;
1268   }
1269 
1270   if (vscaleMax) {
1271     llvm::StringRef argValue = llvm::StringRef(vscaleMax->getValue());
1272     unsigned vscaleMaxVal;
1273     if (argValue.getAsInteger(/*Radix=w*/ 10, vscaleMaxVal)) {
1274       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1275           << vscaleMax->getSpelling() << argValue;
1276       return false;
1277     }
1278     opts.VScaleMax = vscaleMaxVal;
1279   }
1280   return true;
1281 }
1282 
1283 static bool parseLinkerOptionsArgs(CompilerInvocation &invoc,
1284                                    llvm::opt::ArgList &args,
1285                                    clang::DiagnosticsEngine &diags) {
1286   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1287 
1288   // TODO: support --dependent-lib on other platforms when MLIR supports
1289   //       !llvm.dependent.lib
1290   if (args.hasArg(clang::driver::options::OPT_dependent_lib) &&
1291       !triple.isOSWindows()) {
1292     const unsigned diagID =
1293         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1294                               "--dependent-lib is only supported on Windows");
1295     diags.Report(diagID);
1296     return false;
1297   }
1298 
1299   invoc.getCodeGenOpts().DependentLibs =
1300       args.getAllArgValues(clang::driver::options::OPT_dependent_lib);
1301   return true;
1302 }
1303 
1304 static bool parseLangOptionsArgs(CompilerInvocation &invoc,
1305                                  llvm::opt::ArgList &args,
1306                                  clang::DiagnosticsEngine &diags) {
1307   bool success = true;
1308 
1309   success &= parseIntegerOverflowArgs(invoc, args, diags);
1310   success &= parseFloatingPointArgs(invoc, args, diags);
1311   success &= parseVScaleArgs(invoc, args, diags);
1312 
1313   return success;
1314 }
1315 
1316 bool CompilerInvocation::createFromArgs(
1317     CompilerInvocation &invoc, llvm::ArrayRef<const char *> commandLineArgs,
1318     clang::DiagnosticsEngine &diags, const char *argv0) {
1319 
1320   bool success = true;
1321 
1322   // Set the default triple for this CompilerInvocation. This might be
1323   // overridden by users with `-triple` (see the call to `ParseTargetArgs`
1324   // below).
1325   // NOTE: Like in Clang, it would be nice to use option marshalling
1326   // for this so that the entire logic for setting-up the triple is in one
1327   // place.
1328   invoc.getTargetOpts().triple =
1329       llvm::Triple::normalize(llvm::sys::getDefaultTargetTriple());
1330 
1331   // Parse the arguments
1332   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
1333   llvm::opt::Visibility visibilityMask(clang::driver::options::FC1Option);
1334   unsigned missingArgIndex, missingArgCount;
1335   llvm::opt::InputArgList args = opts.ParseArgs(
1336       commandLineArgs, missingArgIndex, missingArgCount, visibilityMask);
1337 
1338   // Check for missing argument error.
1339   if (missingArgCount) {
1340     diags.Report(clang::diag::err_drv_missing_argument)
1341         << args.getArgString(missingArgIndex) << missingArgCount;
1342     success = false;
1343   }
1344 
1345   // Issue errors on unknown arguments
1346   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
1347     auto argString = a->getAsString(args);
1348     std::string nearest;
1349     if (opts.findNearest(argString, nearest, visibilityMask) > 1)
1350       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
1351     else
1352       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
1353           << argString << nearest;
1354     success = false;
1355   }
1356 
1357   // -flang-experimental-hlfir
1358   if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir) ||
1359       args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1360     invoc.loweringOpts.setLowerToHighLevelFIR(true);
1361   }
1362 
1363   // -flang-deprecated-no-hlfir
1364   if (args.hasArg(clang::driver::options::OPT_flang_deprecated_no_hlfir) &&
1365       !args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1366     if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir)) {
1367       const unsigned diagID = diags.getCustomDiagID(
1368           clang::DiagnosticsEngine::Error,
1369           "Options '-flang-experimental-hlfir' and "
1370           "'-flang-deprecated-no-hlfir' cannot be both specified");
1371       diags.Report(diagID);
1372     }
1373     invoc.loweringOpts.setLowerToHighLevelFIR(false);
1374   }
1375 
1376   // -fno-ppc-native-vector-element-order
1377   if (args.hasArg(clang::driver::options::OPT_fno_ppc_native_vec_elem_order)) {
1378     invoc.loweringOpts.setNoPPCNativeVecElemOrder(true);
1379   }
1380 
1381   // -f[no-]init-global-zero
1382   if (args.hasFlag(clang::driver::options::OPT_finit_global_zero,
1383                    clang::driver::options::OPT_fno_init_global_zero,
1384                    /*default=*/true))
1385     invoc.loweringOpts.setInitGlobalZero(true);
1386   else
1387     invoc.loweringOpts.setInitGlobalZero(false);
1388 
1389   // Preserve all the remark options requested, i.e. -Rpass, -Rpass-missed or
1390   // -Rpass-analysis. This will be used later when processing and outputting the
1391   // remarks generated by LLVM in ExecuteCompilerInvocation.cpp.
1392   for (auto *a : args.filtered(clang::driver::options::OPT_R_Group)) {
1393     if (a->getOption().matches(clang::driver::options::OPT_R_value_Group))
1394       // This is -Rfoo=, where foo is the name of the diagnostic
1395       // group. Add only the remark option name to the diagnostics. e.g. for
1396       // -Rpass= we will add the string "pass".
1397       invoc.getDiagnosticOpts().Remarks.push_back(
1398           std::string(a->getOption().getName().drop_front(1).rtrim("=-")));
1399     else
1400       // If no regex was provided, add the provided value, e.g. for -Rpass add
1401       // the string "pass".
1402       invoc.getDiagnosticOpts().Remarks.push_back(a->getValue());
1403   }
1404 
1405   // -frealloc-lhs is the default.
1406   if (!args.hasFlag(clang::driver::options::OPT_frealloc_lhs,
1407                     clang::driver::options::OPT_fno_realloc_lhs, true))
1408     invoc.loweringOpts.setReallocateLHS(false);
1409 
1410   success &= parseFrontendArgs(invoc.getFrontendOpts(), args, diags);
1411   parseTargetArgs(invoc.getTargetOpts(), args);
1412   parsePreprocessorArgs(invoc.getPreprocessorOpts(), args);
1413   parseCodeGenArgs(invoc.getCodeGenOpts(), args, diags);
1414   success &= parseDebugArgs(invoc.getCodeGenOpts(), args, diags);
1415   success &= parseVectorLibArg(invoc.getCodeGenOpts(), args, diags);
1416   success &= parseSemaArgs(invoc, args, diags);
1417   success &= parseDialectArgs(invoc, args, diags);
1418   success &= parseOpenMPArgs(invoc, args, diags);
1419   success &= parseDiagArgs(invoc, args, diags);
1420 
1421   // Collect LLVM (-mllvm) and MLIR (-mmlir) options.
1422   // NOTE: Try to avoid adding any options directly to `llvmArgs` or
1423   // `mlirArgs`. Instead, you can use
1424   //    * `-mllvm <your-llvm-option>`, or
1425   //    * `-mmlir <your-mlir-option>`.
1426   invoc.frontendOpts.llvmArgs =
1427       args.getAllArgValues(clang::driver::options::OPT_mllvm);
1428   invoc.frontendOpts.mlirArgs =
1429       args.getAllArgValues(clang::driver::options::OPT_mmlir);
1430 
1431   success &= parseLangOptionsArgs(invoc, args, diags);
1432 
1433   success &= parseLinkerOptionsArgs(invoc, args, diags);
1434 
1435   // Set the string to be used as the return value of the COMPILER_OPTIONS
1436   // intrinsic of iso_fortran_env. This is either passed in from the parent
1437   // compiler driver invocation with an environment variable, or failing that
1438   // set to the command line arguments of the frontend driver invocation.
1439   invoc.allCompilerInvocOpts = std::string();
1440   llvm::raw_string_ostream os(invoc.allCompilerInvocOpts);
1441   char *compilerOptsEnv = std::getenv("FLANG_COMPILER_OPTIONS_STRING");
1442   if (compilerOptsEnv != nullptr) {
1443     os << compilerOptsEnv;
1444   } else {
1445     os << argv0 << ' ';
1446     for (auto it = commandLineArgs.begin(), e = commandLineArgs.end(); it != e;
1447          ++it) {
1448       os << ' ' << *it;
1449     }
1450   }
1451 
1452   // Process the timing-related options.
1453   if (args.hasArg(clang::driver::options::OPT_ftime_report))
1454     invoc.enableTimers = true;
1455 
1456   invoc.setArgv0(argv0);
1457 
1458   return success;
1459 }
1460 
1461 void CompilerInvocation::collectMacroDefinitions() {
1462   auto &ppOpts = this->getPreprocessorOpts();
1463 
1464   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
1465     llvm::StringRef macro = ppOpts.macros[i].first;
1466     bool isUndef = ppOpts.macros[i].second;
1467 
1468     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
1469     llvm::StringRef macroName = macroPair.first;
1470     llvm::StringRef macroBody = macroPair.second;
1471 
1472     // For an #undef'd macro, we only care about the name.
1473     if (isUndef) {
1474       parserOpts.predefinitions.emplace_back(macroName.str(),
1475                                              std::optional<std::string>{});
1476       continue;
1477     }
1478 
1479     // For a #define'd macro, figure out the actual definition.
1480     if (macroName.size() == macro.size())
1481       macroBody = "1";
1482     else {
1483       // Note: GCC drops anything following an end-of-line character.
1484       llvm::StringRef::size_type end = macroBody.find_first_of("\n\r");
1485       macroBody = macroBody.substr(0, end);
1486     }
1487     parserOpts.predefinitions.emplace_back(
1488         macroName, std::optional<std::string>(macroBody.str()));
1489   }
1490 }
1491 
1492 void CompilerInvocation::setDefaultFortranOpts() {
1493   auto &fortranOptions = getFortranOpts();
1494 
1495   std::vector<std::string> searchDirectories{"."s};
1496   fortranOptions.searchDirectories = searchDirectories;
1497 
1498   // Add the location of omp_lib.h to the search directories. Currently this is
1499   // identical to the modules' directory.
1500   fortranOptions.searchDirectories.emplace_back(
1501       getOpenMPHeadersDir(getArgv0()));
1502 
1503   fortranOptions.isFixedForm = false;
1504 }
1505 
1506 // TODO: When expanding this method, consider creating a dedicated API for
1507 // this. Also at some point we will need to differentiate between different
1508 // targets and add dedicated predefines for each.
1509 void CompilerInvocation::setDefaultPredefinitions() {
1510   auto &fortranOptions = getFortranOpts();
1511   const auto &frontendOptions = getFrontendOpts();
1512   // Populate the macro list with version numbers and other predefinitions.
1513   fortranOptions.predefinitions.emplace_back("__flang__", "1");
1514   fortranOptions.predefinitions.emplace_back("__flang_major__",
1515                                              FLANG_VERSION_MAJOR_STRING);
1516   fortranOptions.predefinitions.emplace_back("__flang_minor__",
1517                                              FLANG_VERSION_MINOR_STRING);
1518   fortranOptions.predefinitions.emplace_back("__flang_patchlevel__",
1519                                              FLANG_VERSION_PATCHLEVEL_STRING);
1520 
1521   // Add predefinitions based on extensions enabled
1522   if (frontendOptions.features.IsEnabled(
1523           Fortran::common::LanguageFeature::OpenACC)) {
1524     fortranOptions.predefinitions.emplace_back("_OPENACC", "202211");
1525   }
1526   if (frontendOptions.features.IsEnabled(
1527           Fortran::common::LanguageFeature::OpenMP)) {
1528     Fortran::common::setOpenMPMacro(getLangOpts().OpenMPVersion,
1529                                     fortranOptions.predefinitions);
1530   }
1531 
1532   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1533   if (targetTriple.isPPC()) {
1534     // '__powerpc__' is a generic macro for any PowerPC cases. e.g. Max integer
1535     // size.
1536     fortranOptions.predefinitions.emplace_back("__powerpc__", "1");
1537   }
1538   if (targetTriple.isOSLinux()) {
1539     fortranOptions.predefinitions.emplace_back("__linux__", "1");
1540   }
1541 
1542   switch (targetTriple.getArch()) {
1543   default:
1544     break;
1545   case llvm::Triple::ArchType::x86_64:
1546     fortranOptions.predefinitions.emplace_back("__x86_64__", "1");
1547     fortranOptions.predefinitions.emplace_back("__x86_64", "1");
1548     break;
1549   }
1550 }
1551 
1552 void CompilerInvocation::setFortranOpts() {
1553   auto &fortranOptions = getFortranOpts();
1554   const auto &frontendOptions = getFrontendOpts();
1555   const auto &preprocessorOptions = getPreprocessorOpts();
1556   auto &moduleDirJ = getModuleDir();
1557 
1558   if (frontendOptions.fortranForm != FortranForm::Unknown) {
1559     fortranOptions.isFixedForm =
1560         frontendOptions.fortranForm == FortranForm::FixedForm;
1561   }
1562   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
1563 
1564   // -E
1565   fortranOptions.prescanAndReformat =
1566       frontendOptions.programAction == PrintPreprocessedInput;
1567 
1568   fortranOptions.features = frontendOptions.features;
1569   fortranOptions.encoding = frontendOptions.encoding;
1570 
1571   // Adding search directories specified by -I
1572   fortranOptions.searchDirectories.insert(
1573       fortranOptions.searchDirectories.end(),
1574       preprocessorOptions.searchDirectoriesFromDashI.begin(),
1575       preprocessorOptions.searchDirectoriesFromDashI.end());
1576 
1577   // Add the ordered list of -intrinsic-modules-path
1578   fortranOptions.searchDirectories.insert(
1579       fortranOptions.searchDirectories.end(),
1580       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
1581       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
1582 
1583   //  Add the default intrinsic module directory
1584   fortranOptions.intrinsicModuleDirectories.emplace_back(
1585       getIntrinsicDir(getArgv0()));
1586 
1587   // Add the directory supplied through -J/-module-dir to the list of search
1588   // directories
1589   if (moduleDirJ != ".")
1590     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
1591 
1592   if (frontendOptions.instrumentedParse)
1593     fortranOptions.instrumentedParse = true;
1594 
1595   if (frontendOptions.showColors)
1596     fortranOptions.showColors = true;
1597 
1598   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
1599     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
1600 
1601   if (getEnableConformanceChecks())
1602     fortranOptions.features.WarnOnAllNonstandard();
1603 
1604   if (getEnableUsageChecks())
1605     fortranOptions.features.WarnOnAllUsage();
1606 
1607   if (getDisableWarnings()) {
1608     fortranOptions.features.DisableAllNonstandardWarnings();
1609     fortranOptions.features.DisableAllUsageWarnings();
1610   }
1611 }
1612 
1613 std::unique_ptr<Fortran::semantics::SemanticsContext>
1614 CompilerInvocation::getSemanticsCtx(
1615     Fortran::parser::AllCookedSources &allCookedSources,
1616     const llvm::TargetMachine &targetMachine) {
1617   auto &fortranOptions = getFortranOpts();
1618 
1619   auto semanticsContext = std::make_unique<semantics::SemanticsContext>(
1620       getDefaultKinds(), fortranOptions.features, getLangOpts(),
1621       allCookedSources);
1622 
1623   semanticsContext->set_moduleDirectory(getModuleDir())
1624       .set_searchDirectories(fortranOptions.searchDirectories)
1625       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
1626       .set_warningsAreErrors(getWarnAsErr())
1627       .set_moduleFileSuffix(getModuleFileSuffix())
1628       .set_underscoring(getCodeGenOpts().Underscoring);
1629 
1630   std::string compilerVersion = Fortran::common::getFlangFullVersion();
1631   Fortran::tools::setUpTargetCharacteristics(
1632       semanticsContext->targetCharacteristics(), targetMachine, getTargetOpts(),
1633       compilerVersion, allCompilerInvocOpts);
1634   return semanticsContext;
1635 }
1636 
1637 /// Set \p loweringOptions controlling lowering behavior based
1638 /// on the \p optimizationLevel.
1639 void CompilerInvocation::setLoweringOptions() {
1640   const CodeGenOptions &codegenOpts = getCodeGenOpts();
1641 
1642   // Lower TRANSPOSE as a runtime call under -O0.
1643   loweringOpts.setOptimizeTranspose(codegenOpts.OptimizationLevel > 0);
1644   loweringOpts.setUnderscoring(codegenOpts.Underscoring);
1645 
1646   const Fortran::common::LangOptions &langOptions = getLangOpts();
1647   loweringOpts.setIntegerWrapAround(langOptions.getSignedOverflowBehavior() ==
1648                                     Fortran::common::LangOptions::SOB_Defined);
1649   Fortran::common::MathOptionsBase &mathOpts = loweringOpts.getMathOptions();
1650   // TODO: when LangOptions are finalized, we can represent
1651   //       the math related options using Fortran::commmon::MathOptionsBase,
1652   //       so that we can just copy it into LoweringOptions.
1653   mathOpts
1654       .setFPContractEnabled(langOptions.getFPContractMode() ==
1655                             Fortran::common::LangOptions::FPM_Fast)
1656       .setNoHonorInfs(langOptions.NoHonorInfs)
1657       .setNoHonorNaNs(langOptions.NoHonorNaNs)
1658       .setApproxFunc(langOptions.ApproxFunc)
1659       .setNoSignedZeros(langOptions.NoSignedZeros)
1660       .setAssociativeMath(langOptions.AssociativeMath)
1661       .setReciprocalMath(langOptions.ReciprocalMath);
1662 }
1663