xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 9e6b46a9846cf5051c2aaef361af0fe1a76c856e) 
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 <cstdlib>
44 #include <memory>
45 #include <optional>
46 
47 using namespace Fortran::frontend;
48 
49 //===----------------------------------------------------------------------===//
50 // Initialization.
51 //===----------------------------------------------------------------------===//
52 CompilerInvocationBase::CompilerInvocationBase()
53     : diagnosticOpts(new clang::DiagnosticOptions()),
54       preprocessorOpts(new PreprocessorOptions()) {}
55 
56 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &x)
57     : diagnosticOpts(new clang::DiagnosticOptions(x.getDiagnosticOpts())),
58       preprocessorOpts(new PreprocessorOptions(x.getPreprocessorOpts())) {}
59 
60 CompilerInvocationBase::~CompilerInvocationBase() = default;
61 
62 //===----------------------------------------------------------------------===//
63 // Deserialization (from args)
64 //===----------------------------------------------------------------------===//
65 static bool parseShowColorsArgs(const llvm::opt::ArgList &args,
66                                 bool defaultColor = true) {
67   // Color diagnostics default to auto ("on" if terminal supports) in the
68   // compiler driver `flang-new` but default to off in the frontend driver
69   // `flang-new -fc1`, needing an explicit OPT_fdiagnostics_color.
70   // Support both clang's -f[no-]color-diagnostics and gcc's
71   // -f[no-]diagnostics-colors[=never|always|auto].
72   enum {
73     Colors_On,
74     Colors_Off,
75     Colors_Auto
76   } showColors = defaultColor ? Colors_Auto : Colors_Off;
77 
78   for (auto *a : args) {
79     const llvm::opt::Option &opt = a->getOption();
80     if (opt.matches(clang::driver::options::OPT_fcolor_diagnostics)) {
81       showColors = Colors_On;
82     } else if (opt.matches(clang::driver::options::OPT_fno_color_diagnostics)) {
83       showColors = Colors_Off;
84     } else if (opt.matches(clang::driver::options::OPT_fdiagnostics_color_EQ)) {
85       llvm::StringRef value(a->getValue());
86       if (value == "always")
87         showColors = Colors_On;
88       else if (value == "never")
89         showColors = Colors_Off;
90       else if (value == "auto")
91         showColors = Colors_Auto;
92     }
93   }
94 
95   return showColors == Colors_On ||
96          (showColors == Colors_Auto &&
97           llvm::sys::Process::StandardErrHasColors());
98 }
99 
100 /// Extracts the optimisation level from \a args.
101 static unsigned getOptimizationLevel(llvm::opt::ArgList &args,
102                                      clang::DiagnosticsEngine &diags) {
103   unsigned defaultOpt = 0;
104 
105   if (llvm::opt::Arg *a =
106           args.getLastArg(clang::driver::options::OPT_O_Group)) {
107     if (a->getOption().matches(clang::driver::options::OPT_O0))
108       return 0;
109 
110     assert(a->getOption().matches(clang::driver::options::OPT_O));
111 
112     return getLastArgIntValue(args, clang::driver::options::OPT_O, defaultOpt,
113                               diags);
114   }
115 
116   return defaultOpt;
117 }
118 
119 bool Fortran::frontend::parseDiagnosticArgs(clang::DiagnosticOptions &opts,
120                                             llvm::opt::ArgList &args) {
121   opts.ShowColors = parseShowColorsArgs(args);
122 
123   return true;
124 }
125 
126 static bool parseDebugArgs(Fortran::frontend::CodeGenOptions &opts,
127                            llvm::opt::ArgList &args,
128                            clang::DiagnosticsEngine &diags) {
129   using DebugInfoKind = llvm::codegenoptions::DebugInfoKind;
130   if (llvm::opt::Arg *arg =
131           args.getLastArg(clang::driver::options::OPT_debug_info_kind_EQ)) {
132     std::optional<DebugInfoKind> val =
133         llvm::StringSwitch<std::optional<DebugInfoKind>>(arg->getValue())
134             .Case("line-tables-only", llvm::codegenoptions::DebugLineTablesOnly)
135             .Case("line-directives-only",
136                   llvm::codegenoptions::DebugDirectivesOnly)
137             .Case("constructor", llvm::codegenoptions::DebugInfoConstructor)
138             .Case("limited", llvm::codegenoptions::LimitedDebugInfo)
139             .Case("standalone", llvm::codegenoptions::FullDebugInfo)
140             .Case("unused-types", llvm::codegenoptions::UnusedTypeInfo)
141             .Default(std::nullopt);
142     if (!val.has_value()) {
143       diags.Report(clang::diag::err_drv_invalid_value)
144           << arg->getAsString(args) << arg->getValue();
145       return false;
146     }
147     opts.setDebugInfo(val.value());
148     if (val != llvm::codegenoptions::DebugLineTablesOnly &&
149         val != llvm::codegenoptions::FullDebugInfo &&
150         val != llvm::codegenoptions::NoDebugInfo) {
151       const auto debugWarning = diags.getCustomDiagID(
152           clang::DiagnosticsEngine::Warning, "Unsupported debug option: %0");
153       diags.Report(debugWarning) << arg->getValue();
154     }
155   }
156   return true;
157 }
158 
159 static bool parseVectorLibArg(Fortran::frontend::CodeGenOptions &opts,
160                               llvm::opt::ArgList &args,
161                               clang::DiagnosticsEngine &diags) {
162   llvm::opt::Arg *arg = args.getLastArg(clang::driver::options::OPT_fveclib);
163   if (!arg)
164     return true;
165 
166   using VectorLibrary = llvm::driver::VectorLibrary;
167   std::optional<VectorLibrary> val =
168       llvm::StringSwitch<std::optional<VectorLibrary>>(arg->getValue())
169           .Case("Accelerate", VectorLibrary::Accelerate)
170           .Case("LIBMVEC", VectorLibrary::LIBMVEC)
171           .Case("MASSV", VectorLibrary::MASSV)
172           .Case("SVML", VectorLibrary::SVML)
173           .Case("SLEEF", VectorLibrary::SLEEF)
174           .Case("Darwin_libsystem_m", VectorLibrary::Darwin_libsystem_m)
175           .Case("ArmPL", VectorLibrary::ArmPL)
176           .Case("NoLibrary", VectorLibrary::NoLibrary)
177           .Default(std::nullopt);
178   if (!val.has_value()) {
179     diags.Report(clang::diag::err_drv_invalid_value)
180         << arg->getAsString(args) << arg->getValue();
181     return false;
182   }
183   opts.setVecLib(val.value());
184   return true;
185 }
186 
187 // Generate an OptRemark object containing info on if the -Rgroup
188 // specified is enabled or not.
189 static CodeGenOptions::OptRemark
190 parseOptimizationRemark(clang::DiagnosticsEngine &diags,
191                         llvm::opt::ArgList &args, llvm::opt::OptSpecifier optEq,
192                         llvm::StringRef remarkOptName) {
193   assert((remarkOptName == "pass" || remarkOptName == "pass-missed" ||
194           remarkOptName == "pass-analysis") &&
195          "Unsupported remark option name provided.");
196   CodeGenOptions::OptRemark result;
197 
198   for (llvm::opt::Arg *a : args) {
199     if (a->getOption().matches(clang::driver::options::OPT_R_Joined)) {
200       llvm::StringRef value = a->getValue();
201 
202       if (value == remarkOptName) {
203         result.Kind = CodeGenOptions::RemarkKind::RK_Enabled;
204         // Enable everything
205         result.Pattern = ".*";
206         result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
207 
208       } else if (value.split('-') ==
209                  std::make_pair(llvm::StringRef("no"), remarkOptName)) {
210         result.Kind = CodeGenOptions::RemarkKind::RK_Disabled;
211         // Disable everything
212         result.Pattern = "";
213         result.Regex = nullptr;
214       }
215     } else if (a->getOption().matches(optEq)) {
216       result.Kind = CodeGenOptions::RemarkKind::RK_WithPattern;
217       result.Pattern = a->getValue();
218       result.Regex = std::make_shared<llvm::Regex>(result.Pattern);
219       std::string regexError;
220 
221       if (!result.Regex->isValid(regexError)) {
222         diags.Report(clang::diag::err_drv_optimization_remark_pattern)
223             << regexError << a->getAsString(args);
224         return CodeGenOptions::OptRemark();
225       }
226     }
227   }
228   return result;
229 }
230 
231 static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
232                              llvm::opt::ArgList &args,
233                              clang::DiagnosticsEngine &diags) {
234   opts.OptimizationLevel = getOptimizationLevel(args, diags);
235 
236   if (args.hasFlag(clang::driver::options::OPT_fdebug_pass_manager,
237                    clang::driver::options::OPT_fno_debug_pass_manager, false))
238     opts.DebugPassManager = 1;
239 
240   if (args.hasFlag(clang::driver::options::OPT_fstack_arrays,
241                    clang::driver::options::OPT_fno_stack_arrays, false))
242     opts.StackArrays = 1;
243 
244   if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
245                    clang::driver::options::OPT_fno_loop_versioning, false))
246     opts.LoopVersioning = 1;
247 
248   opts.AliasAnalysis = opts.OptimizationLevel > 0;
249 
250   // -mframe-pointer=none/non-leaf/all option.
251   if (const llvm::opt::Arg *a =
252           args.getLastArg(clang::driver::options::OPT_mframe_pointer_EQ)) {
253     std::optional<llvm::FramePointerKind> val =
254         llvm::StringSwitch<std::optional<llvm::FramePointerKind>>(a->getValue())
255             .Case("none", llvm::FramePointerKind::None)
256             .Case("non-leaf", llvm::FramePointerKind::NonLeaf)
257             .Case("all", llvm::FramePointerKind::All)
258             .Default(std::nullopt);
259 
260     if (!val.has_value()) {
261       diags.Report(clang::diag::err_drv_invalid_value)
262           << a->getAsString(args) << a->getValue();
263     } else
264       opts.setFramePointer(val.value());
265   }
266 
267   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
268     opts.LLVMPassPlugins.push_back(a->getValue());
269 
270   // -fembed-offload-object option
271   for (auto *a :
272        args.filtered(clang::driver::options::OPT_fembed_offload_object_EQ))
273     opts.OffloadObjects.push_back(a->getValue());
274 
275   // -flto=full/thin option.
276   if (const llvm::opt::Arg *a =
277           args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
278     llvm::StringRef s = a->getValue();
279     assert((s == "full" || s == "thin") && "Unknown LTO mode.");
280     if (s == "full")
281       opts.PrepareForFullLTO = true;
282     else
283       opts.PrepareForThinLTO = true;
284   }
285 
286   if (const llvm::opt::Arg *a = args.getLastArg(
287           clang::driver::options::OPT_mcode_object_version_EQ)) {
288     llvm::StringRef s = a->getValue();
289     if (s == "6")
290       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_6;
291     if (s == "5")
292       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_5;
293     if (s == "4")
294       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_4;
295     if (s == "none")
296       opts.CodeObjectVersion = llvm::CodeObjectVersionKind::COV_None;
297   }
298 
299   // -f[no-]save-optimization-record[=<format>]
300   if (const llvm::opt::Arg *a =
301           args.getLastArg(clang::driver::options::OPT_opt_record_file))
302     opts.OptRecordFile = a->getValue();
303 
304   // Optimization file format. Defaults to yaml
305   if (const llvm::opt::Arg *a =
306           args.getLastArg(clang::driver::options::OPT_opt_record_format))
307     opts.OptRecordFormat = a->getValue();
308 
309   // Specifies, using a regex, which successful optimization passes(middle and
310   // backend), to include in the final optimization record file generated. If
311   // not provided -fsave-optimization-record will include all passes.
312   if (const llvm::opt::Arg *a =
313           args.getLastArg(clang::driver::options::OPT_opt_record_passes))
314     opts.OptRecordPasses = a->getValue();
315 
316   // Create OptRemark that allows printing of all successful optimization
317   // passes applied.
318   opts.OptimizationRemark =
319       parseOptimizationRemark(diags, args, clang::driver::options::OPT_Rpass_EQ,
320                               /*remarkOptName=*/"pass");
321 
322   // Create OptRemark that allows all missed optimization passes to be printed.
323   opts.OptimizationRemarkMissed = parseOptimizationRemark(
324       diags, args, clang::driver::options::OPT_Rpass_missed_EQ,
325       /*remarkOptName=*/"pass-missed");
326 
327   // Create OptRemark that allows all optimization decisions made by LLVM
328   // to be printed.
329   opts.OptimizationRemarkAnalysis = parseOptimizationRemark(
330       diags, args, clang::driver::options::OPT_Rpass_analysis_EQ,
331       /*remarkOptName=*/"pass-analysis");
332 
333   if (opts.getDebugInfo() == llvm::codegenoptions::NoDebugInfo) {
334     // If the user requested a flag that requires source locations available in
335     // the backend, make sure that the backend tracks source location
336     // information.
337     bool needLocTracking = !opts.OptRecordFile.empty() ||
338                            !opts.OptRecordPasses.empty() ||
339                            !opts.OptRecordFormat.empty() ||
340                            opts.OptimizationRemark.hasValidPattern() ||
341                            opts.OptimizationRemarkMissed.hasValidPattern() ||
342                            opts.OptimizationRemarkAnalysis.hasValidPattern();
343 
344     if (needLocTracking)
345       opts.setDebugInfo(llvm::codegenoptions::LocTrackingOnly);
346   }
347 
348   if (auto *a = args.getLastArg(clang::driver::options::OPT_save_temps_EQ))
349     opts.SaveTempsDir = a->getValue();
350 
351   // -mlink-builtin-bitcode
352   for (auto *a :
353        args.filtered(clang::driver::options::OPT_mlink_builtin_bitcode))
354     opts.BuiltinBCLibs.push_back(a->getValue());
355 
356   // -mrelocation-model option.
357   if (const llvm::opt::Arg *a =
358           args.getLastArg(clang::driver::options::OPT_mrelocation_model)) {
359     llvm::StringRef modelName = a->getValue();
360     auto relocModel =
361         llvm::StringSwitch<std::optional<llvm::Reloc::Model>>(modelName)
362             .Case("static", llvm::Reloc::Static)
363             .Case("pic", llvm::Reloc::PIC_)
364             .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
365             .Case("ropi", llvm::Reloc::ROPI)
366             .Case("rwpi", llvm::Reloc::RWPI)
367             .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
368             .Default(std::nullopt);
369     if (relocModel.has_value())
370       opts.setRelocationModel(*relocModel);
371     else
372       diags.Report(clang::diag::err_drv_invalid_value)
373           << a->getAsString(args) << modelName;
374   }
375 
376   // -pic-level and -pic-is-pie option.
377   if (int picLevel = getLastArgIntValue(
378           args, clang::driver::options::OPT_pic_level, 0, diags)) {
379     if (picLevel > 2)
380       diags.Report(clang::diag::err_drv_invalid_value)
381           << args.getLastArg(clang::driver::options::OPT_pic_level)
382                  ->getAsString(args)
383           << picLevel;
384 
385     opts.PICLevel = picLevel;
386     if (args.hasArg(clang::driver::options::OPT_pic_is_pie))
387       opts.IsPIE = 1;
388   }
389 
390   // -mcmodel option.
391   if (const llvm::opt::Arg *a =
392           args.getLastArg(clang::driver::options::OPT_mcmodel_EQ)) {
393     llvm::StringRef modelName = a->getValue();
394     std::optional<llvm::CodeModel::Model> codeModel = getCodeModel(modelName);
395 
396     if (codeModel.has_value())
397       opts.CodeModel = modelName;
398     else
399       diags.Report(clang::diag::err_drv_invalid_value)
400           << a->getAsString(args) << modelName;
401   }
402 
403   if (const llvm::opt::Arg *arg = args.getLastArg(
404           clang::driver::options::OPT_mlarge_data_threshold_EQ)) {
405     uint64_t LDT;
406     if (llvm::StringRef(arg->getValue()).getAsInteger(/*Radix=*/10, LDT)) {
407       diags.Report(clang::diag::err_drv_invalid_value)
408           << arg->getSpelling() << arg->getValue();
409     }
410     opts.LargeDataThreshold = LDT;
411   }
412 
413   // This option is compatible with -f[no-]underscoring in gfortran.
414   if (args.hasFlag(clang::driver::options::OPT_fno_underscoring,
415                    clang::driver::options::OPT_funderscoring, false)) {
416     opts.Underscoring = 0;
417   }
418 }
419 
420 /// Parses all target input arguments and populates the target
421 /// options accordingly.
422 ///
423 /// \param [in] opts The target options instance to update
424 /// \param [in] args The list of input arguments (from the compiler invocation)
425 static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
426   if (const llvm::opt::Arg *a =
427           args.getLastArg(clang::driver::options::OPT_triple))
428     opts.triple = a->getValue();
429 
430   if (const llvm::opt::Arg *a =
431           args.getLastArg(clang::driver::options::OPT_target_cpu))
432     opts.cpu = a->getValue();
433 
434   for (const llvm::opt::Arg *currentArg :
435        args.filtered(clang::driver::options::OPT_target_feature))
436     opts.featuresAsWritten.emplace_back(currentArg->getValue());
437 }
438 
439 // Tweak the frontend configuration based on the frontend action
440 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
441   if (opts.programAction == DebugDumpParsingLog)
442     opts.instrumentedParse = true;
443 
444   if (opts.programAction == DebugDumpProvenance ||
445       opts.programAction == Fortran::frontend::GetDefinition)
446     opts.needProvenanceRangeToCharBlockMappings = true;
447 }
448 
449 /// Parse the argument specified for the -fconvert=<value> option
450 static std::optional<const char *> parseConvertArg(const char *s) {
451   return llvm::StringSwitch<std::optional<const char *>>(s)
452       .Case("unknown", "UNKNOWN")
453       .Case("native", "NATIVE")
454       .Case("little-endian", "LITTLE_ENDIAN")
455       .Case("big-endian", "BIG_ENDIAN")
456       .Case("swap", "SWAP")
457       .Default(std::nullopt);
458 }
459 
460 static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
461                               clang::DiagnosticsEngine &diags) {
462   unsigned numErrorsBefore = diags.getNumErrors();
463 
464   // By default the frontend driver creates a ParseSyntaxOnly action.
465   opts.programAction = ParseSyntaxOnly;
466 
467   // Treat multiple action options as an invocation error. Note that `clang
468   // -cc1` does accept multiple action options, but will only consider the
469   // rightmost one.
470   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
471     const unsigned diagID = diags.getCustomDiagID(
472         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
473     diags.Report(diagID);
474     return false;
475   }
476 
477   // Identify the action (i.e. opts.ProgramAction)
478   if (const llvm::opt::Arg *a =
479           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
480     switch (a->getOption().getID()) {
481     default: {
482       llvm_unreachable("Invalid option in group!");
483     }
484     case clang::driver::options::OPT_test_io:
485       opts.programAction = InputOutputTest;
486       break;
487     case clang::driver::options::OPT_E:
488       opts.programAction = PrintPreprocessedInput;
489       break;
490     case clang::driver::options::OPT_fsyntax_only:
491       opts.programAction = ParseSyntaxOnly;
492       break;
493     case clang::driver::options::OPT_emit_fir:
494       opts.programAction = EmitFIR;
495       break;
496     case clang::driver::options::OPT_emit_hlfir:
497       opts.programAction = EmitHLFIR;
498       break;
499     case clang::driver::options::OPT_emit_llvm:
500       opts.programAction = EmitLLVM;
501       break;
502     case clang::driver::options::OPT_emit_llvm_bc:
503       opts.programAction = EmitLLVMBitcode;
504       break;
505     case clang::driver::options::OPT_emit_obj:
506       opts.programAction = EmitObj;
507       break;
508     case clang::driver::options::OPT_S:
509       opts.programAction = EmitAssembly;
510       break;
511     case clang::driver::options::OPT_fdebug_unparse:
512       opts.programAction = DebugUnparse;
513       break;
514     case clang::driver::options::OPT_fdebug_unparse_no_sema:
515       opts.programAction = DebugUnparseNoSema;
516       break;
517     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
518       opts.programAction = DebugUnparseWithSymbols;
519       break;
520     case clang::driver::options::OPT_fdebug_unparse_with_modules:
521       opts.programAction = DebugUnparseWithModules;
522       break;
523     case clang::driver::options::OPT_fdebug_dump_symbols:
524       opts.programAction = DebugDumpSymbols;
525       break;
526     case clang::driver::options::OPT_fdebug_dump_parse_tree:
527       opts.programAction = DebugDumpParseTree;
528       break;
529     case clang::driver::options::OPT_fdebug_dump_pft:
530       opts.programAction = DebugDumpPFT;
531       break;
532     case clang::driver::options::OPT_fdebug_dump_all:
533       opts.programAction = DebugDumpAll;
534       break;
535     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
536       opts.programAction = DebugDumpParseTreeNoSema;
537       break;
538     case clang::driver::options::OPT_fdebug_dump_provenance:
539       opts.programAction = DebugDumpProvenance;
540       break;
541     case clang::driver::options::OPT_fdebug_dump_parsing_log:
542       opts.programAction = DebugDumpParsingLog;
543       break;
544     case clang::driver::options::OPT_fdebug_measure_parse_tree:
545       opts.programAction = DebugMeasureParseTree;
546       break;
547     case clang::driver::options::OPT_fdebug_pre_fir_tree:
548       opts.programAction = DebugPreFIRTree;
549       break;
550     case clang::driver::options::OPT_fget_symbols_sources:
551       opts.programAction = GetSymbolsSources;
552       break;
553     case clang::driver::options::OPT_fget_definition:
554       opts.programAction = GetDefinition;
555       break;
556     case clang::driver::options::OPT_init_only:
557       opts.programAction = InitOnly;
558       break;
559 
560       // TODO:
561       // case clang::driver::options::OPT_emit_llvm:
562       // case clang::driver::options::OPT_emit_llvm_only:
563       // case clang::driver::options::OPT_emit_codegen_only:
564       // case clang::driver::options::OPT_emit_module:
565       // (...)
566     }
567 
568     // Parse the values provided with `-fget-definition` (there should be 3
569     // integers)
570     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
571         clang::driver::options::OPT_fget_definition) {
572       unsigned optVals[3] = {0, 0, 0};
573 
574       for (unsigned i = 0; i < 3; i++) {
575         llvm::StringRef val = a->getValue(i);
576 
577         if (val.getAsInteger(10, optVals[i])) {
578           // A non-integer was encountered - that's an error.
579           diags.Report(clang::diag::err_drv_invalid_value)
580               << a->getOption().getName() << val;
581           break;
582         }
583       }
584       opts.getDefVals.line = optVals[0];
585       opts.getDefVals.startColumn = optVals[1];
586       opts.getDefVals.endColumn = optVals[2];
587     }
588   }
589 
590   // Parsing -load <dsopath> option and storing shared object path
591   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
592     opts.plugins.push_back(a->getValue());
593   }
594 
595   // Parsing -plugin <name> option and storing plugin name and setting action
596   if (const llvm::opt::Arg *a =
597           args.getLastArg(clang::driver::options::OPT_plugin)) {
598     opts.programAction = PluginAction;
599     opts.actionName = a->getValue();
600   }
601 
602   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
603   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
604   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
605 
606   // Get the input kind (from the value passed via `-x`)
607   InputKind dashX(Language::Unknown);
608   if (const llvm::opt::Arg *a =
609           args.getLastArg(clang::driver::options::OPT_x)) {
610     llvm::StringRef xValue = a->getValue();
611     // Principal languages.
612     dashX = llvm::StringSwitch<InputKind>(xValue)
613                 // Flang does not differentiate between pre-processed and not
614                 // pre-processed inputs.
615                 .Case("f95", Language::Fortran)
616                 .Case("f95-cpp-input", Language::Fortran)
617                 // CUDA Fortran
618                 .Case("cuda", Language::Fortran)
619                 .Default(Language::Unknown);
620 
621     // Flang's intermediate representations.
622     if (dashX.isUnknown())
623       dashX = llvm::StringSwitch<InputKind>(xValue)
624                   .Case("ir", Language::LLVM_IR)
625                   .Case("fir", Language::MLIR)
626                   .Case("mlir", Language::MLIR)
627                   .Default(Language::Unknown);
628 
629     if (dashX.isUnknown())
630       diags.Report(clang::diag::err_drv_invalid_value)
631           << a->getAsString(args) << a->getValue();
632   }
633 
634   // Collect the input files and save them in our instance of FrontendOptions.
635   std::vector<std::string> inputs =
636       args.getAllArgValues(clang::driver::options::OPT_INPUT);
637   opts.inputs.clear();
638   if (inputs.empty())
639     // '-' is the default input if none is given.
640     inputs.push_back("-");
641   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
642     InputKind ik = dashX;
643     if (ik.isUnknown()) {
644       ik = FrontendOptions::getInputKindForExtension(
645           llvm::StringRef(inputs[i]).rsplit('.').second);
646       if (ik.isUnknown())
647         ik = Language::Unknown;
648       if (i == 0)
649         dashX = ik;
650     }
651 
652     opts.inputs.emplace_back(std::move(inputs[i]), ik);
653   }
654 
655   // Set fortranForm based on options -ffree-form and -ffixed-form.
656   if (const auto *arg =
657           args.getLastArg(clang::driver::options::OPT_ffixed_form,
658                           clang::driver::options::OPT_ffree_form)) {
659     opts.fortranForm =
660         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
661             ? FortranForm::FixedForm
662             : FortranForm::FreeForm;
663   }
664 
665   // Set fixedFormColumns based on -ffixed-line-length=<value>
666   if (const auto *arg =
667           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
668     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
669     std::int64_t columns = -1;
670     if (argValue == "none") {
671       columns = 0;
672     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
673       columns = -1;
674     }
675     if (columns < 0) {
676       diags.Report(clang::diag::err_drv_negative_columns)
677           << arg->getOption().getName() << arg->getValue();
678     } else if (columns == 0) {
679       opts.fixedFormColumns = 1000000;
680     } else if (columns < 7) {
681       diags.Report(clang::diag::err_drv_small_columns)
682           << arg->getOption().getName() << arg->getValue() << "7";
683     } else {
684       opts.fixedFormColumns = columns;
685     }
686   }
687 
688   // Set conversion based on -fconvert=<value>
689   if (const auto *arg =
690           args.getLastArg(clang::driver::options::OPT_fconvert_EQ)) {
691     const char *argValue = arg->getValue();
692     if (auto convert = parseConvertArg(argValue))
693       opts.envDefaults.push_back({"FORT_CONVERT", *convert});
694     else
695       diags.Report(clang::diag::err_drv_invalid_value)
696           << arg->getAsString(args) << argValue;
697   }
698 
699   // -f{no-}implicit-none
700   opts.features.Enable(
701       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
702       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
703                    clang::driver::options::OPT_fno_implicit_none, false));
704 
705   // -f{no-}backslash
706   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
707                        args.hasFlag(clang::driver::options::OPT_fbackslash,
708                                     clang::driver::options::OPT_fno_backslash,
709                                     false));
710 
711   // -f{no-}logical-abbreviations
712   opts.features.Enable(
713       Fortran::common::LanguageFeature::LogicalAbbreviations,
714       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
715                    clang::driver::options::OPT_fno_logical_abbreviations,
716                    false));
717 
718   // -f{no-}xor-operator
719   opts.features.Enable(
720       Fortran::common::LanguageFeature::XOROperator,
721       args.hasFlag(clang::driver::options::OPT_fxor_operator,
722                    clang::driver::options::OPT_fno_xor_operator, false));
723 
724   // -fno-automatic
725   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
726     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
727   }
728 
729   if (args.hasArg(
730           clang::driver::options::OPT_falternative_parameter_statement)) {
731     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
732   }
733   if (const llvm::opt::Arg *arg =
734           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
735     llvm::StringRef argValue = arg->getValue();
736     if (argValue == "utf-8") {
737       opts.encoding = Fortran::parser::Encoding::UTF_8;
738     } else if (argValue == "latin-1") {
739       opts.encoding = Fortran::parser::Encoding::LATIN_1;
740     } else {
741       diags.Report(clang::diag::err_drv_invalid_value)
742           << arg->getAsString(args) << argValue;
743     }
744   }
745 
746   setUpFrontendBasedOnAction(opts);
747   opts.dashX = dashX;
748 
749   return diags.getNumErrors() == numErrorsBefore;
750 }
751 
752 // Generate the path to look for intrinsic modules
753 static std::string getIntrinsicDir(const char *argv) {
754   // TODO: Find a system independent API
755   llvm::SmallString<128> driverPath;
756   driverPath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
757   llvm::sys::path::remove_filename(driverPath);
758   driverPath.append("/../include/flang/");
759   return std::string(driverPath);
760 }
761 
762 // Generate the path to look for OpenMP headers
763 static std::string getOpenMPHeadersDir(const char *argv) {
764   llvm::SmallString<128> includePath;
765   includePath.assign(llvm::sys::fs::getMainExecutable(argv, nullptr));
766   llvm::sys::path::remove_filename(includePath);
767   includePath.append("/../include/flang/OpenMP/");
768   return std::string(includePath);
769 }
770 
771 /// Parses all preprocessor input arguments and populates the preprocessor
772 /// options accordingly.
773 ///
774 /// \param [in] opts The preprocessor options instance
775 /// \param [out] args The list of input arguments
776 static void parsePreprocessorArgs(Fortran::frontend::PreprocessorOptions &opts,
777                                   llvm::opt::ArgList &args) {
778   // Add macros from the command line.
779   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_D,
780                                               clang::driver::options::OPT_U)) {
781     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
782       opts.addMacroDef(currentArg->getValue());
783     } else {
784       opts.addMacroUndef(currentArg->getValue());
785     }
786   }
787 
788   // Add the ordered list of -I's.
789   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
790     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
791 
792   // Prepend the ordered list of -intrinsic-modules-path
793   // to the default location to search.
794   for (const auto *currentArg :
795        args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
796     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
797 
798   // -cpp/-nocpp
799   if (const auto *currentArg = args.getLastArg(
800           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
801     opts.macrosFlag =
802         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
803             ? PPMacrosFlag::Include
804             : PPMacrosFlag::Exclude;
805 
806   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
807   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
808   opts.showMacros = args.hasArg(clang::driver::options::OPT_dM);
809 }
810 
811 /// Parses all semantic related arguments and populates the variables
812 /// options accordingly. Returns false if new errors are generated.
813 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
814                           clang::DiagnosticsEngine &diags) {
815   unsigned numErrorsBefore = diags.getNumErrors();
816 
817   // -J/module-dir option
818   auto moduleDirList =
819       args.getAllArgValues(clang::driver::options::OPT_module_dir);
820   // User can only specify -J/-module-dir once
821   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
822   if (moduleDirList.size() > 1) {
823     const unsigned diagID =
824         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
825                               "Only one '-module-dir/-J' option allowed");
826     diags.Report(diagID);
827   }
828   if (moduleDirList.size() == 1)
829     res.setModuleDir(moduleDirList[0]);
830 
831   // -fdebug-module-writer option
832   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
833     res.setDebugModuleDir(true);
834   }
835 
836   // -module-suffix
837   if (const auto *moduleSuffix =
838           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
839     res.setModuleFileSuffix(moduleSuffix->getValue());
840   }
841 
842   // -f{no-}analyzed-objects-for-unparse
843   res.setUseAnalyzedObjectsForUnparse(args.hasFlag(
844       clang::driver::options::OPT_fanalyzed_objects_for_unparse,
845       clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
846 
847   return diags.getNumErrors() == numErrorsBefore;
848 }
849 
850 /// Parses all diagnostics related arguments and populates the variables
851 /// options accordingly. Returns false if new errors are generated.
852 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
853                           clang::DiagnosticsEngine &diags) {
854   unsigned numErrorsBefore = diags.getNumErrors();
855 
856   // -Werror option
857   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
858   // this has to change when other -W<opt>'s are supported.
859   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
860     const auto &wArgs =
861         args.getAllArgValues(clang::driver::options::OPT_W_Joined);
862     for (const auto &wArg : wArgs) {
863       if (wArg == "error") {
864         res.setWarnAsErr(true);
865       } else {
866         const unsigned diagID =
867             diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
868                                   "Only `-Werror` is supported currently.");
869         diags.Report(diagID);
870       }
871     }
872   }
873 
874   // Default to off for `flang-new -fc1`.
875   res.getFrontendOpts().showColors =
876       parseShowColorsArgs(args, /*defaultDiagColor=*/false);
877 
878   // Honor color diagnostics.
879   res.getDiagnosticOpts().ShowColors = res.getFrontendOpts().showColors;
880 
881   return diags.getNumErrors() == numErrorsBefore;
882 }
883 
884 /// Parses all Dialect related arguments and populates the variables
885 /// options accordingly. Returns false if new errors are generated.
886 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
887                              clang::DiagnosticsEngine &diags) {
888   unsigned numErrorsBefore = diags.getNumErrors();
889 
890   // -fdefault* family
891   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
892     res.getDefaultKinds().set_defaultRealKind(8);
893     res.getDefaultKinds().set_doublePrecisionKind(16);
894   }
895   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
896     res.getDefaultKinds().set_defaultIntegerKind(8);
897     res.getDefaultKinds().set_subscriptIntegerKind(8);
898     res.getDefaultKinds().set_sizeIntegerKind(8);
899     res.getDefaultKinds().set_defaultLogicalKind(8);
900   }
901   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
902     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
903       // -fdefault-double-8 has to be used with -fdefault-real-8
904       // to be compatible with gfortran
905       const unsigned diagID = diags.getCustomDiagID(
906           clang::DiagnosticsEngine::Error,
907           "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
908       diags.Report(diagID);
909     }
910     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
911     res.getDefaultKinds().set_doublePrecisionKind(8);
912   }
913   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
914     res.getDefaultKinds().set_sizeIntegerKind(8);
915 
916   // -x cuda
917   auto language = args.getLastArgValue(clang::driver::options::OPT_x);
918   if (language == "cuda") {
919     res.getFrontendOpts().features.Enable(
920         Fortran::common::LanguageFeature::CUDA);
921   }
922 
923   // -fopenmp and -fopenacc
924   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
925     res.getFrontendOpts().features.Enable(
926         Fortran::common::LanguageFeature::OpenACC);
927   }
928   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
929     // By default OpenMP is set to 1.1 version
930     res.getLangOpts().OpenMPVersion = 11;
931     res.getFrontendOpts().features.Enable(
932         Fortran::common::LanguageFeature::OpenMP);
933     if (int Version = getLastArgIntValue(
934             args, clang::driver::options::OPT_fopenmp_version_EQ,
935             res.getLangOpts().OpenMPVersion, diags)) {
936       res.getLangOpts().OpenMPVersion = Version;
937     }
938     if (args.hasArg(clang::driver::options::OPT_fopenmp_force_usm)) {
939       res.getLangOpts().OpenMPForceUSM = 1;
940     }
941     if (args.hasArg(clang::driver::options::OPT_fopenmp_is_target_device)) {
942       res.getLangOpts().OpenMPIsTargetDevice = 1;
943 
944       // Get OpenMP host file path if any and report if a non existent file is
945       // found
946       if (auto *arg = args.getLastArg(
947               clang::driver::options::OPT_fopenmp_host_ir_file_path)) {
948         res.getLangOpts().OMPHostIRFile = arg->getValue();
949         if (!llvm::sys::fs::exists(res.getLangOpts().OMPHostIRFile))
950           diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
951               << res.getLangOpts().OMPHostIRFile;
952       }
953 
954       if (args.hasFlag(
955               clang::driver::options::OPT_fopenmp_assume_teams_oversubscription,
956               clang::driver::options::
957                   OPT_fno_openmp_assume_teams_oversubscription,
958               /*Default=*/false))
959         res.getLangOpts().OpenMPTeamSubscription = true;
960 
961       if (args.hasArg(
962               clang::driver::options::OPT_fopenmp_assume_no_thread_state))
963         res.getLangOpts().OpenMPNoThreadState = 1;
964 
965       if (args.hasArg(
966               clang::driver::options::OPT_fopenmp_assume_no_nested_parallelism))
967         res.getLangOpts().OpenMPNoNestedParallelism = 1;
968 
969       if (args.hasFlag(clang::driver::options::
970                            OPT_fopenmp_assume_threads_oversubscription,
971                        clang::driver::options::
972                            OPT_fno_openmp_assume_threads_oversubscription,
973                        /*Default=*/false))
974         res.getLangOpts().OpenMPThreadSubscription = true;
975 
976       if ((args.hasArg(clang::driver::options::OPT_fopenmp_target_debug) ||
977            args.hasArg(clang::driver::options::OPT_fopenmp_target_debug_EQ))) {
978         res.getLangOpts().OpenMPTargetDebug = getLastArgIntValue(
979             args, clang::driver::options::OPT_fopenmp_target_debug_EQ,
980             res.getLangOpts().OpenMPTargetDebug, diags);
981 
982         if (!res.getLangOpts().OpenMPTargetDebug &&
983             args.hasArg(clang::driver::options::OPT_fopenmp_target_debug))
984           res.getLangOpts().OpenMPTargetDebug = 1;
985       }
986       if (args.hasArg(clang::driver::options::OPT_nogpulib))
987         res.getLangOpts().NoGPULib = 1;
988     }
989 
990     switch (llvm::Triple(res.getTargetOpts().triple).getArch()) {
991     case llvm::Triple::nvptx:
992     case llvm::Triple::nvptx64:
993     case llvm::Triple::amdgcn:
994       if (!res.getLangOpts().OpenMPIsTargetDevice) {
995         const unsigned diagID = diags.getCustomDiagID(
996             clang::DiagnosticsEngine::Error,
997             "OpenMP AMDGPU/NVPTX is only prepared to deal with device code.");
998         diags.Report(diagID);
999       }
1000       res.getLangOpts().OpenMPIsGPU = 1;
1001       break;
1002     default:
1003       res.getLangOpts().OpenMPIsGPU = 0;
1004       break;
1005     }
1006   }
1007 
1008   // -pedantic
1009   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
1010     res.setEnableConformanceChecks();
1011     res.setEnableUsageChecks();
1012   }
1013 
1014   // -w
1015   if (args.hasArg(clang::driver::options::OPT_w))
1016     res.setDisableWarnings();
1017 
1018   // -std=f2018
1019   // TODO: Set proper options when more fortran standards
1020   // are supported.
1021   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
1022     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
1023     // We only allow f2018 as the given standard
1024     if (standard == "f2018") {
1025       res.setEnableConformanceChecks();
1026     } else {
1027       const unsigned diagID =
1028           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1029                                 "Only -std=f2018 is allowed currently.");
1030       diags.Report(diagID);
1031     }
1032   }
1033   return diags.getNumErrors() == numErrorsBefore;
1034 }
1035 
1036 /// Parses all floating point related arguments and populates the
1037 /// CompilerInvocation accordingly.
1038 /// Returns false if new errors are generated.
1039 ///
1040 /// \param [out] invoc Stores the processed arguments
1041 /// \param [in] args The compiler invocation arguments to parse
1042 /// \param [out] diags DiagnosticsEngine to report erros with
1043 static bool parseFloatingPointArgs(CompilerInvocation &invoc,
1044                                    llvm::opt::ArgList &args,
1045                                    clang::DiagnosticsEngine &diags) {
1046   LangOptions &opts = invoc.getLangOpts();
1047 
1048   if (const llvm::opt::Arg *a =
1049           args.getLastArg(clang::driver::options::OPT_ffp_contract)) {
1050     const llvm::StringRef val = a->getValue();
1051     enum LangOptions::FPModeKind fpContractMode;
1052 
1053     if (val == "off")
1054       fpContractMode = LangOptions::FPM_Off;
1055     else if (val == "fast")
1056       fpContractMode = LangOptions::FPM_Fast;
1057     else {
1058       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1059           << a->getSpelling() << val;
1060       return false;
1061     }
1062 
1063     opts.setFPContractMode(fpContractMode);
1064   }
1065 
1066   if (args.getLastArg(clang::driver::options::OPT_menable_no_infinities)) {
1067     opts.NoHonorInfs = true;
1068   }
1069 
1070   if (args.getLastArg(clang::driver::options::OPT_menable_no_nans)) {
1071     opts.NoHonorNaNs = true;
1072   }
1073 
1074   if (args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
1075     opts.ApproxFunc = true;
1076   }
1077 
1078   if (args.getLastArg(clang::driver::options::OPT_fno_signed_zeros)) {
1079     opts.NoSignedZeros = true;
1080   }
1081 
1082   if (args.getLastArg(clang::driver::options::OPT_mreassociate)) {
1083     opts.AssociativeMath = true;
1084   }
1085 
1086   if (args.getLastArg(clang::driver::options::OPT_freciprocal_math)) {
1087     opts.ReciprocalMath = true;
1088   }
1089 
1090   if (args.getLastArg(clang::driver::options::OPT_ffast_math)) {
1091     opts.NoHonorInfs = true;
1092     opts.NoHonorNaNs = true;
1093     opts.AssociativeMath = true;
1094     opts.ReciprocalMath = true;
1095     opts.ApproxFunc = true;
1096     opts.NoSignedZeros = true;
1097     opts.setFPContractMode(LangOptions::FPM_Fast);
1098   }
1099 
1100   return true;
1101 }
1102 
1103 /// Parses vscale range options and populates the CompilerInvocation
1104 /// accordingly.
1105 /// Returns false if new errors are generated.
1106 ///
1107 /// \param [out] invoc Stores the processed arguments
1108 /// \param [in] args The compiler invocation arguments to parse
1109 /// \param [out] diags DiagnosticsEngine to report erros with
1110 static bool parseVScaleArgs(CompilerInvocation &invoc, llvm::opt::ArgList &args,
1111                             clang::DiagnosticsEngine &diags) {
1112   const auto *vscaleMin =
1113       args.getLastArg(clang::driver::options::OPT_mvscale_min_EQ);
1114   const auto *vscaleMax =
1115       args.getLastArg(clang::driver::options::OPT_mvscale_max_EQ);
1116 
1117   if (!vscaleMin && !vscaleMax)
1118     return true;
1119 
1120   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1121   if (!triple.isAArch64() && !triple.isRISCV()) {
1122     const unsigned diagID =
1123         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1124                               "`-mvscale-max` and `-mvscale-min` are not "
1125                               "supported for this architecture: %0");
1126     diags.Report(diagID) << triple.getArchName();
1127     return false;
1128   }
1129 
1130   LangOptions &opts = invoc.getLangOpts();
1131   if (vscaleMin) {
1132     llvm::StringRef argValue = llvm::StringRef(vscaleMin->getValue());
1133     unsigned vscaleMinVal;
1134     if (argValue.getAsInteger(/*Radix=*/10, vscaleMinVal)) {
1135       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1136           << vscaleMax->getSpelling() << argValue;
1137       return false;
1138     }
1139     opts.VScaleMin = vscaleMinVal;
1140   }
1141 
1142   if (vscaleMax) {
1143     llvm::StringRef argValue = llvm::StringRef(vscaleMax->getValue());
1144     unsigned vscaleMaxVal;
1145     if (argValue.getAsInteger(/*Radix=w*/ 10, vscaleMaxVal)) {
1146       diags.Report(clang::diag::err_drv_unsupported_option_argument)
1147           << vscaleMax->getSpelling() << argValue;
1148       return false;
1149     }
1150     opts.VScaleMax = vscaleMaxVal;
1151   }
1152   return true;
1153 }
1154 
1155 static bool parseLinkerOptionsArgs(CompilerInvocation &invoc,
1156                                    llvm::opt::ArgList &args,
1157                                    clang::DiagnosticsEngine &diags) {
1158   llvm::Triple triple = llvm::Triple(invoc.getTargetOpts().triple);
1159 
1160   // TODO: support --dependent-lib on other platforms when MLIR supports
1161   //       !llvm.dependent.lib
1162   if (args.hasArg(clang::driver::options::OPT_dependent_lib) &&
1163       !triple.isOSWindows()) {
1164     const unsigned diagID =
1165         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
1166                               "--dependent-lib is only supported on Windows");
1167     diags.Report(diagID);
1168     return false;
1169   }
1170 
1171   invoc.getCodeGenOpts().DependentLibs =
1172       args.getAllArgValues(clang::driver::options::OPT_dependent_lib);
1173   return true;
1174 }
1175 
1176 bool CompilerInvocation::createFromArgs(
1177     CompilerInvocation &invoc, llvm::ArrayRef<const char *> commandLineArgs,
1178     clang::DiagnosticsEngine &diags, const char *argv0) {
1179 
1180   bool success = true;
1181 
1182   // Set the default triple for this CompilerInvocation. This might be
1183   // overridden by users with `-triple` (see the call to `ParseTargetArgs`
1184   // below).
1185   // NOTE: Like in Clang, it would be nice to use option marshalling
1186   // for this so that the entire logic for setting-up the triple is in one
1187   // place.
1188   invoc.getTargetOpts().triple =
1189       llvm::Triple::normalize(llvm::sys::getDefaultTargetTriple());
1190 
1191   // Parse the arguments
1192   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
1193   llvm::opt::Visibility visibilityMask(clang::driver::options::FC1Option);
1194   unsigned missingArgIndex, missingArgCount;
1195   llvm::opt::InputArgList args = opts.ParseArgs(
1196       commandLineArgs, missingArgIndex, missingArgCount, visibilityMask);
1197 
1198   // Check for missing argument error.
1199   if (missingArgCount) {
1200     diags.Report(clang::diag::err_drv_missing_argument)
1201         << args.getArgString(missingArgIndex) << missingArgCount;
1202     success = false;
1203   }
1204 
1205   // Issue errors on unknown arguments
1206   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
1207     auto argString = a->getAsString(args);
1208     std::string nearest;
1209     if (opts.findNearest(argString, nearest, visibilityMask) > 1)
1210       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
1211     else
1212       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
1213           << argString << nearest;
1214     success = false;
1215   }
1216 
1217   // -flang-experimental-hlfir
1218   if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir) ||
1219       args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1220     invoc.loweringOpts.setLowerToHighLevelFIR(true);
1221   }
1222 
1223   // -flang-deprecated-no-hlfir
1224   if (args.hasArg(clang::driver::options::OPT_flang_deprecated_no_hlfir) &&
1225       !args.hasArg(clang::driver::options::OPT_emit_hlfir)) {
1226     if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir)) {
1227       const unsigned diagID = diags.getCustomDiagID(
1228           clang::DiagnosticsEngine::Error,
1229           "Options '-flang-experimental-hlfir' and "
1230           "'-flang-deprecated-no-hlfir' cannot be both specified");
1231       diags.Report(diagID);
1232     }
1233     invoc.loweringOpts.setLowerToHighLevelFIR(false);
1234   }
1235 
1236   // -fno-ppc-native-vector-element-order
1237   if (args.hasArg(clang::driver::options::OPT_fno_ppc_native_vec_elem_order)) {
1238     invoc.loweringOpts.setNoPPCNativeVecElemOrder(true);
1239   }
1240 
1241   // -flang-experimental-integer-overflow
1242   if (args.hasArg(
1243           clang::driver::options::OPT_flang_experimental_integer_overflow)) {
1244     invoc.loweringOpts.setNSWOnLoopVarInc(true);
1245   }
1246 
1247   // Preserve all the remark options requested, i.e. -Rpass, -Rpass-missed or
1248   // -Rpass-analysis. This will be used later when processing and outputting the
1249   // remarks generated by LLVM in ExecuteCompilerInvocation.cpp.
1250   for (auto *a : args.filtered(clang::driver::options::OPT_R_Group)) {
1251     if (a->getOption().matches(clang::driver::options::OPT_R_value_Group))
1252       // This is -Rfoo=, where foo is the name of the diagnostic
1253       // group. Add only the remark option name to the diagnostics. e.g. for
1254       // -Rpass= we will add the string "pass".
1255       invoc.getDiagnosticOpts().Remarks.push_back(
1256           std::string(a->getOption().getName().drop_front(1).rtrim("=-")));
1257     else
1258       // If no regex was provided, add the provided value, e.g. for -Rpass add
1259       // the string "pass".
1260       invoc.getDiagnosticOpts().Remarks.push_back(a->getValue());
1261   }
1262 
1263   success &= parseFrontendArgs(invoc.getFrontendOpts(), args, diags);
1264   parseTargetArgs(invoc.getTargetOpts(), args);
1265   parsePreprocessorArgs(invoc.getPreprocessorOpts(), args);
1266   parseCodeGenArgs(invoc.getCodeGenOpts(), args, diags);
1267   success &= parseDebugArgs(invoc.getCodeGenOpts(), args, diags);
1268   success &= parseVectorLibArg(invoc.getCodeGenOpts(), args, diags);
1269   success &= parseSemaArgs(invoc, args, diags);
1270   success &= parseDialectArgs(invoc, args, diags);
1271   success &= parseDiagArgs(invoc, args, diags);
1272 
1273   // Collect LLVM (-mllvm) and MLIR (-mmlir) options.
1274   // NOTE: Try to avoid adding any options directly to `llvmArgs` or
1275   // `mlirArgs`. Instead, you can use
1276   //    * `-mllvm <your-llvm-option>`, or
1277   //    * `-mmlir <your-mlir-option>`.
1278   invoc.frontendOpts.llvmArgs =
1279       args.getAllArgValues(clang::driver::options::OPT_mllvm);
1280   invoc.frontendOpts.mlirArgs =
1281       args.getAllArgValues(clang::driver::options::OPT_mmlir);
1282 
1283   success &= parseFloatingPointArgs(invoc, args, diags);
1284 
1285   success &= parseVScaleArgs(invoc, args, diags);
1286 
1287   success &= parseLinkerOptionsArgs(invoc, args, diags);
1288 
1289   // Set the string to be used as the return value of the COMPILER_OPTIONS
1290   // intrinsic of iso_fortran_env. This is either passed in from the parent
1291   // compiler driver invocation with an environment variable, or failing that
1292   // set to the command line arguments of the frontend driver invocation.
1293   invoc.allCompilerInvocOpts = std::string();
1294   llvm::raw_string_ostream os(invoc.allCompilerInvocOpts);
1295   char *compilerOptsEnv = std::getenv("FLANG_COMPILER_OPTIONS_STRING");
1296   if (compilerOptsEnv != nullptr) {
1297     os << compilerOptsEnv;
1298   } else {
1299     os << argv0 << ' ';
1300     for (auto it = commandLineArgs.begin(), e = commandLineArgs.end(); it != e;
1301          ++it) {
1302       os << ' ' << *it;
1303     }
1304   }
1305 
1306   invoc.setArgv0(argv0);
1307 
1308   return success;
1309 }
1310 
1311 void CompilerInvocation::collectMacroDefinitions() {
1312   auto &ppOpts = this->getPreprocessorOpts();
1313 
1314   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
1315     llvm::StringRef macro = ppOpts.macros[i].first;
1316     bool isUndef = ppOpts.macros[i].second;
1317 
1318     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
1319     llvm::StringRef macroName = macroPair.first;
1320     llvm::StringRef macroBody = macroPair.second;
1321 
1322     // For an #undef'd macro, we only care about the name.
1323     if (isUndef) {
1324       parserOpts.predefinitions.emplace_back(macroName.str(),
1325                                              std::optional<std::string>{});
1326       continue;
1327     }
1328 
1329     // For a #define'd macro, figure out the actual definition.
1330     if (macroName.size() == macro.size())
1331       macroBody = "1";
1332     else {
1333       // Note: GCC drops anything following an end-of-line character.
1334       llvm::StringRef::size_type end = macroBody.find_first_of("\n\r");
1335       macroBody = macroBody.substr(0, end);
1336     }
1337     parserOpts.predefinitions.emplace_back(
1338         macroName, std::optional<std::string>(macroBody.str()));
1339   }
1340 }
1341 
1342 void CompilerInvocation::setDefaultFortranOpts() {
1343   auto &fortranOptions = getFortranOpts();
1344 
1345   std::vector<std::string> searchDirectories{"."s};
1346   fortranOptions.searchDirectories = searchDirectories;
1347 
1348   // Add the location of omp_lib.h to the search directories. Currently this is
1349   // identical to the modules' directory.
1350   fortranOptions.searchDirectories.emplace_back(
1351       getOpenMPHeadersDir(getArgv0()));
1352 
1353   fortranOptions.isFixedForm = false;
1354 }
1355 
1356 // TODO: When expanding this method, consider creating a dedicated API for
1357 // this. Also at some point we will need to differentiate between different
1358 // targets and add dedicated predefines for each.
1359 void CompilerInvocation::setDefaultPredefinitions() {
1360   auto &fortranOptions = getFortranOpts();
1361   const auto &frontendOptions = getFrontendOpts();
1362   // Populate the macro list with version numbers and other predefinitions.
1363   fortranOptions.predefinitions.emplace_back("__flang__", "1");
1364   fortranOptions.predefinitions.emplace_back("__flang_major__",
1365                                              FLANG_VERSION_MAJOR_STRING);
1366   fortranOptions.predefinitions.emplace_back("__flang_minor__",
1367                                              FLANG_VERSION_MINOR_STRING);
1368   fortranOptions.predefinitions.emplace_back("__flang_patchlevel__",
1369                                              FLANG_VERSION_PATCHLEVEL_STRING);
1370 
1371   // Add predefinitions based on extensions enabled
1372   if (frontendOptions.features.IsEnabled(
1373           Fortran::common::LanguageFeature::OpenACC)) {
1374     fortranOptions.predefinitions.emplace_back("_OPENACC", "202211");
1375   }
1376   if (frontendOptions.features.IsEnabled(
1377           Fortran::common::LanguageFeature::OpenMP)) {
1378     Fortran::common::setOpenMPMacro(getLangOpts().OpenMPVersion,
1379                                     fortranOptions.predefinitions);
1380   }
1381 
1382   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1383   if (targetTriple.isPPC()) {
1384     // '__powerpc__' is a generic macro for any PowerPC cases. e.g. Max integer
1385     // size.
1386     fortranOptions.predefinitions.emplace_back("__powerpc__", "1");
1387   }
1388   if (targetTriple.isOSLinux()) {
1389     fortranOptions.predefinitions.emplace_back("__linux__", "1");
1390   }
1391 
1392   switch (targetTriple.getArch()) {
1393   default:
1394     break;
1395   case llvm::Triple::ArchType::x86_64:
1396     fortranOptions.predefinitions.emplace_back("__x86_64__", "1");
1397     fortranOptions.predefinitions.emplace_back("__x86_64", "1");
1398     break;
1399   }
1400 }
1401 
1402 void CompilerInvocation::setFortranOpts() {
1403   auto &fortranOptions = getFortranOpts();
1404   const auto &frontendOptions = getFrontendOpts();
1405   const auto &preprocessorOptions = getPreprocessorOpts();
1406   auto &moduleDirJ = getModuleDir();
1407 
1408   if (frontendOptions.fortranForm != FortranForm::Unknown) {
1409     fortranOptions.isFixedForm =
1410         frontendOptions.fortranForm == FortranForm::FixedForm;
1411   }
1412   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
1413 
1414   fortranOptions.features = frontendOptions.features;
1415   fortranOptions.encoding = frontendOptions.encoding;
1416 
1417   // Adding search directories specified by -I
1418   fortranOptions.searchDirectories.insert(
1419       fortranOptions.searchDirectories.end(),
1420       preprocessorOptions.searchDirectoriesFromDashI.begin(),
1421       preprocessorOptions.searchDirectoriesFromDashI.end());
1422 
1423   // Add the ordered list of -intrinsic-modules-path
1424   fortranOptions.searchDirectories.insert(
1425       fortranOptions.searchDirectories.end(),
1426       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
1427       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
1428 
1429   //  Add the default intrinsic module directory
1430   fortranOptions.intrinsicModuleDirectories.emplace_back(
1431       getIntrinsicDir(getArgv0()));
1432 
1433   // Add the directory supplied through -J/-module-dir to the list of search
1434   // directories
1435   if (moduleDirJ != ".")
1436     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
1437 
1438   if (frontendOptions.instrumentedParse)
1439     fortranOptions.instrumentedParse = true;
1440 
1441   if (frontendOptions.showColors)
1442     fortranOptions.showColors = true;
1443 
1444   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
1445     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
1446 
1447   if (getEnableConformanceChecks())
1448     fortranOptions.features.WarnOnAllNonstandard();
1449 
1450   if (getEnableUsageChecks())
1451     fortranOptions.features.WarnOnAllUsage();
1452 
1453   if (getDisableWarnings()) {
1454     fortranOptions.features.DisableAllNonstandardWarnings();
1455     fortranOptions.features.DisableAllUsageWarnings();
1456   }
1457 }
1458 
1459 std::unique_ptr<Fortran::semantics::SemanticsContext>
1460 CompilerInvocation::getSemanticsCtx(
1461     Fortran::parser::AllCookedSources &allCookedSources,
1462     const llvm::TargetMachine &targetMachine) {
1463   auto &fortranOptions = getFortranOpts();
1464 
1465   auto semanticsContext = std::make_unique<semantics::SemanticsContext>(
1466       getDefaultKinds(), fortranOptions.features, allCookedSources);
1467 
1468   semanticsContext->set_moduleDirectory(getModuleDir())
1469       .set_searchDirectories(fortranOptions.searchDirectories)
1470       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
1471       .set_warningsAreErrors(getWarnAsErr())
1472       .set_moduleFileSuffix(getModuleFileSuffix())
1473       .set_underscoring(getCodeGenOpts().Underscoring);
1474 
1475   std::string compilerVersion = Fortran::common::getFlangFullVersion();
1476   Fortran::tools::setUpTargetCharacteristics(
1477       semanticsContext->targetCharacteristics(), targetMachine, compilerVersion,
1478       allCompilerInvocOpts);
1479   return semanticsContext;
1480 }
1481 
1482 /// Set \p loweringOptions controlling lowering behavior based
1483 /// on the \p optimizationLevel.
1484 void CompilerInvocation::setLoweringOptions() {
1485   const CodeGenOptions &codegenOpts = getCodeGenOpts();
1486 
1487   // Lower TRANSPOSE as a runtime call under -O0.
1488   loweringOpts.setOptimizeTranspose(codegenOpts.OptimizationLevel > 0);
1489   loweringOpts.setUnderscoring(codegenOpts.Underscoring);
1490 
1491   const LangOptions &langOptions = getLangOpts();
1492   Fortran::common::MathOptionsBase &mathOpts = loweringOpts.getMathOptions();
1493   // TODO: when LangOptions are finalized, we can represent
1494   //       the math related options using Fortran::commmon::MathOptionsBase,
1495   //       so that we can just copy it into LoweringOptions.
1496   mathOpts
1497       .setFPContractEnabled(langOptions.getFPContractMode() ==
1498                             LangOptions::FPM_Fast)
1499       .setNoHonorInfs(langOptions.NoHonorInfs)
1500       .setNoHonorNaNs(langOptions.NoHonorNaNs)
1501       .setApproxFunc(langOptions.ApproxFunc)
1502       .setNoSignedZeros(langOptions.NoSignedZeros)
1503       .setAssociativeMath(langOptions.AssociativeMath)
1504       .setReciprocalMath(langOptions.ReciprocalMath);
1505 }
1506