xref: /llvm-project/flang/lib/Frontend/CompilerInvocation.cpp (revision 191d48723f8b853a6ad65532c173c67155cbe606) 
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/Frontend/CodeGenOptions.h"
16 #include "flang/Frontend/PreprocessorOptions.h"
17 #include "flang/Frontend/TargetOptions.h"
18 #include "flang/Semantics/semantics.h"
19 #include "flang/Version.inc"
20 #include "clang/Basic/AllDiagnostics.h"
21 #include "clang/Basic/DiagnosticDriver.h"
22 #include "clang/Basic/DiagnosticOptions.h"
23 #include "clang/Driver/DriverDiagnostic.h"
24 #include "clang/Driver/OptionUtils.h"
25 #include "clang/Driver/Options.h"
26 #include "llvm/ADT/StringRef.h"
27 #include "llvm/ADT/StringSwitch.h"
28 #include "llvm/Frontend/Debug/Options.h"
29 #include "llvm/Option/Arg.h"
30 #include "llvm/Option/ArgList.h"
31 #include "llvm/Option/OptTable.h"
32 #include "llvm/Support/FileSystem.h"
33 #include "llvm/Support/FileUtilities.h"
34 #include "llvm/Support/Path.h"
35 #include "llvm/Support/Process.h"
36 #include "llvm/Support/raw_ostream.h"
37 #include "llvm/TargetParser/Host.h"
38 #include "llvm/TargetParser/Triple.h"
39 #include <memory>
40 #include <optional>
41 
42 using namespace Fortran::frontend;
43 
44 //===----------------------------------------------------------------------===//
45 // Initialization.
46 //===----------------------------------------------------------------------===//
47 CompilerInvocationBase::CompilerInvocationBase()
48     : diagnosticOpts(new clang::DiagnosticOptions()),
49       preprocessorOpts(new PreprocessorOptions()) {}
50 
51 CompilerInvocationBase::CompilerInvocationBase(const CompilerInvocationBase &x)
52     : diagnosticOpts(new clang::DiagnosticOptions(x.getDiagnosticOpts())),
53       preprocessorOpts(new PreprocessorOptions(x.getPreprocessorOpts())) {}
54 
55 CompilerInvocationBase::~CompilerInvocationBase() = default;
56 
57 //===----------------------------------------------------------------------===//
58 // Deserialization (from args)
59 //===----------------------------------------------------------------------===//
60 static bool parseShowColorsArgs(const llvm::opt::ArgList &args,
61                                 bool defaultColor = true) {
62   // Color diagnostics default to auto ("on" if terminal supports) in the
63   // compiler driver `flang-new` but default to off in the frontend driver
64   // `flang-new -fc1`, needing an explicit OPT_fdiagnostics_color.
65   // Support both clang's -f[no-]color-diagnostics and gcc's
66   // -f[no-]diagnostics-colors[=never|always|auto].
67   enum {
68     Colors_On,
69     Colors_Off,
70     Colors_Auto
71   } showColors = defaultColor ? Colors_Auto : Colors_Off;
72 
73   for (auto *a : args) {
74     const llvm::opt::Option &opt = a->getOption();
75     if (opt.matches(clang::driver::options::OPT_fcolor_diagnostics)) {
76       showColors = Colors_On;
77     } else if (opt.matches(clang::driver::options::OPT_fno_color_diagnostics)) {
78       showColors = Colors_Off;
79     } else if (opt.matches(clang::driver::options::OPT_fdiagnostics_color_EQ)) {
80       llvm::StringRef value(a->getValue());
81       if (value == "always")
82         showColors = Colors_On;
83       else if (value == "never")
84         showColors = Colors_Off;
85       else if (value == "auto")
86         showColors = Colors_Auto;
87     }
88   }
89 
90   return showColors == Colors_On ||
91          (showColors == Colors_Auto &&
92           llvm::sys::Process::StandardErrHasColors());
93 }
94 
95 /// Extracts the optimisation level from \a args.
96 static unsigned getOptimizationLevel(llvm::opt::ArgList &args,
97                                      clang::DiagnosticsEngine &diags) {
98   unsigned defaultOpt = llvm::CodeGenOpt::None;
99 
100   if (llvm::opt::Arg *a =
101           args.getLastArg(clang::driver::options::OPT_O_Group)) {
102     if (a->getOption().matches(clang::driver::options::OPT_O0))
103       return llvm::CodeGenOpt::None;
104 
105     assert(a->getOption().matches(clang::driver::options::OPT_O));
106 
107     return getLastArgIntValue(args, clang::driver::options::OPT_O, defaultOpt,
108                               diags);
109   }
110 
111   return defaultOpt;
112 }
113 
114 bool Fortran::frontend::parseDiagnosticArgs(clang::DiagnosticOptions &opts,
115                                             llvm::opt::ArgList &args) {
116   opts.ShowColors = parseShowColorsArgs(args);
117 
118   return true;
119 }
120 
121 static bool parseDebugArgs(Fortran::frontend::CodeGenOptions &opts,
122                            llvm::opt::ArgList &args,
123                            clang::DiagnosticsEngine &diags) {
124   using DebugInfoKind = llvm::codegenoptions::DebugInfoKind;
125   if (llvm::opt::Arg *arg =
126           args.getLastArg(clang::driver::options::OPT_debug_info_kind_EQ)) {
127     std::optional<DebugInfoKind> val =
128         llvm::StringSwitch<std::optional<DebugInfoKind>>(arg->getValue())
129             .Case("line-tables-only", llvm::codegenoptions::DebugLineTablesOnly)
130             .Case("line-directives-only",
131                   llvm::codegenoptions::DebugDirectivesOnly)
132             .Case("constructor", llvm::codegenoptions::DebugInfoConstructor)
133             .Case("limited", llvm::codegenoptions::LimitedDebugInfo)
134             .Case("standalone", llvm::codegenoptions::FullDebugInfo)
135             .Case("unused-types", llvm::codegenoptions::UnusedTypeInfo)
136             .Default(std::nullopt);
137     if (!val.has_value()) {
138       diags.Report(clang::diag::err_drv_invalid_value)
139           << arg->getAsString(args) << arg->getValue();
140       return false;
141     }
142     opts.setDebugInfo(val.value());
143     if (val != llvm::codegenoptions::DebugLineTablesOnly &&
144         val != llvm::codegenoptions::NoDebugInfo) {
145       const auto debugWarning = diags.getCustomDiagID(
146           clang::DiagnosticsEngine::Warning, "Unsupported debug option: %0");
147       diags.Report(debugWarning) << arg->getValue();
148     }
149   }
150   return true;
151 }
152 
153 static void parseCodeGenArgs(Fortran::frontend::CodeGenOptions &opts,
154                              llvm::opt::ArgList &args,
155                              clang::DiagnosticsEngine &diags) {
156   opts.OptimizationLevel = getOptimizationLevel(args, diags);
157 
158   if (args.hasFlag(clang::driver::options::OPT_fdebug_pass_manager,
159                    clang::driver::options::OPT_fno_debug_pass_manager, false))
160     opts.DebugPassManager = 1;
161 
162   if (args.hasFlag(clang::driver::options::OPT_fstack_arrays,
163                    clang::driver::options::OPT_fno_stack_arrays, false)) {
164     opts.StackArrays = 1;
165   }
166   if (args.hasFlag(clang::driver::options::OPT_floop_versioning,
167                    clang::driver::options::OPT_fno_loop_versioning, false)) {
168     opts.LoopVersioning = 1;
169   }
170 
171   for (auto *a : args.filtered(clang::driver::options::OPT_fpass_plugin_EQ))
172     opts.LLVMPassPlugins.push_back(a->getValue());
173 
174   // -fembed-offload-object option
175   for (auto *a :
176        args.filtered(clang::driver::options::OPT_fembed_offload_object_EQ))
177     opts.OffloadObjects.push_back(a->getValue());
178 
179   // -flto=full/thin option.
180   if (const llvm::opt::Arg *a =
181           args.getLastArg(clang::driver::options::OPT_flto_EQ)) {
182     llvm::StringRef s = a->getValue();
183     assert((s == "full" || s == "thin") && "Unknown LTO mode.");
184     if (s == "full")
185       opts.PrepareForFullLTO = true;
186     else
187       opts.PrepareForThinLTO = true;
188   }
189 
190   if (auto *a = args.getLastArg(clang::driver::options::OPT_save_temps_EQ))
191     opts.SaveTempsDir = a->getValue();
192 
193   // -mrelocation-model option.
194   if (const llvm::opt::Arg *a =
195           args.getLastArg(clang::driver::options::OPT_mrelocation_model)) {
196     llvm::StringRef modelName = a->getValue();
197     auto relocModel =
198         llvm::StringSwitch<std::optional<llvm::Reloc::Model>>(modelName)
199             .Case("static", llvm::Reloc::Static)
200             .Case("pic", llvm::Reloc::PIC_)
201             .Case("dynamic-no-pic", llvm::Reloc::DynamicNoPIC)
202             .Case("ropi", llvm::Reloc::ROPI)
203             .Case("rwpi", llvm::Reloc::RWPI)
204             .Case("ropi-rwpi", llvm::Reloc::ROPI_RWPI)
205             .Default(std::nullopt);
206     if (relocModel.has_value())
207       opts.setRelocationModel(*relocModel);
208     else
209       diags.Report(clang::diag::err_drv_invalid_value)
210           << a->getAsString(args) << modelName;
211   }
212 
213   // -pic-level and -pic-is-pie option.
214   if (int picLevel = getLastArgIntValue(
215           args, clang::driver::options::OPT_pic_level, 0, diags)) {
216     if (picLevel > 2)
217       diags.Report(clang::diag::err_drv_invalid_value)
218           << args.getLastArg(clang::driver::options::OPT_pic_level)
219                  ->getAsString(args)
220           << picLevel;
221 
222     opts.PICLevel = picLevel;
223     if (args.hasArg(clang::driver::options::OPT_pic_is_pie))
224       opts.IsPIE = 1;
225   }
226 
227   // This option is compatible with -f[no-]underscoring in gfortran.
228   if (args.hasFlag(clang::driver::options::OPT_fno_underscoring,
229                    clang::driver::options::OPT_funderscoring, false)) {
230     opts.Underscoring = 0;
231   }
232 }
233 
234 /// Parses all target input arguments and populates the target
235 /// options accordingly.
236 ///
237 /// \param [in] opts The target options instance to update
238 /// \param [in] args The list of input arguments (from the compiler invocation)
239 static void parseTargetArgs(TargetOptions &opts, llvm::opt::ArgList &args) {
240   if (const llvm::opt::Arg *a =
241           args.getLastArg(clang::driver::options::OPT_triple))
242     opts.triple = a->getValue();
243 
244   if (const llvm::opt::Arg *a =
245           args.getLastArg(clang::driver::options::OPT_target_cpu))
246     opts.cpu = a->getValue();
247 
248   for (const llvm::opt::Arg *currentArg :
249        args.filtered(clang::driver::options::OPT_target_feature))
250     opts.featuresAsWritten.emplace_back(currentArg->getValue());
251 }
252 
253 // Tweak the frontend configuration based on the frontend action
254 static void setUpFrontendBasedOnAction(FrontendOptions &opts) {
255   if (opts.programAction == DebugDumpParsingLog)
256     opts.instrumentedParse = true;
257 
258   if (opts.programAction == DebugDumpProvenance ||
259       opts.programAction == Fortran::frontend::GetDefinition)
260     opts.needProvenanceRangeToCharBlockMappings = true;
261 }
262 
263 /// Parse the argument specified for the -fconvert=<value> option
264 static std::optional<const char *> parseConvertArg(const char *s) {
265   return llvm::StringSwitch<std::optional<const char *>>(s)
266       .Case("unknown", "UNKNOWN")
267       .Case("native", "NATIVE")
268       .Case("little-endian", "LITTLE_ENDIAN")
269       .Case("big-endian", "BIG_ENDIAN")
270       .Case("swap", "SWAP")
271       .Default(std::nullopt);
272 }
273 
274 static bool parseFrontendArgs(FrontendOptions &opts, llvm::opt::ArgList &args,
275                               clang::DiagnosticsEngine &diags) {
276   unsigned numErrorsBefore = diags.getNumErrors();
277 
278   // By default the frontend driver creates a ParseSyntaxOnly action.
279   opts.programAction = ParseSyntaxOnly;
280 
281   // Treat multiple action options as an invocation error. Note that `clang
282   // -cc1` does accept multiple action options, but will only consider the
283   // rightmost one.
284   if (args.hasMultipleArgs(clang::driver::options::OPT_Action_Group)) {
285     const unsigned diagID = diags.getCustomDiagID(
286         clang::DiagnosticsEngine::Error, "Only one action option is allowed");
287     diags.Report(diagID);
288     return false;
289   }
290 
291   // Identify the action (i.e. opts.ProgramAction)
292   if (const llvm::opt::Arg *a =
293           args.getLastArg(clang::driver::options::OPT_Action_Group)) {
294     switch (a->getOption().getID()) {
295     default: {
296       llvm_unreachable("Invalid option in group!");
297     }
298     case clang::driver::options::OPT_test_io:
299       opts.programAction = InputOutputTest;
300       break;
301     case clang::driver::options::OPT_E:
302       opts.programAction = PrintPreprocessedInput;
303       break;
304     case clang::driver::options::OPT_fsyntax_only:
305       opts.programAction = ParseSyntaxOnly;
306       break;
307     case clang::driver::options::OPT_emit_mlir:
308       opts.programAction = EmitMLIR;
309       break;
310     case clang::driver::options::OPT_emit_llvm:
311       opts.programAction = EmitLLVM;
312       break;
313     case clang::driver::options::OPT_emit_llvm_bc:
314       opts.programAction = EmitLLVMBitcode;
315       break;
316     case clang::driver::options::OPT_emit_obj:
317       opts.programAction = EmitObj;
318       break;
319     case clang::driver::options::OPT_S:
320       opts.programAction = EmitAssembly;
321       break;
322     case clang::driver::options::OPT_fdebug_unparse:
323       opts.programAction = DebugUnparse;
324       break;
325     case clang::driver::options::OPT_fdebug_unparse_no_sema:
326       opts.programAction = DebugUnparseNoSema;
327       break;
328     case clang::driver::options::OPT_fdebug_unparse_with_symbols:
329       opts.programAction = DebugUnparseWithSymbols;
330       break;
331     case clang::driver::options::OPT_fdebug_dump_symbols:
332       opts.programAction = DebugDumpSymbols;
333       break;
334     case clang::driver::options::OPT_fdebug_dump_parse_tree:
335       opts.programAction = DebugDumpParseTree;
336       break;
337     case clang::driver::options::OPT_fdebug_dump_pft:
338       opts.programAction = DebugDumpPFT;
339       break;
340     case clang::driver::options::OPT_fdebug_dump_all:
341       opts.programAction = DebugDumpAll;
342       break;
343     case clang::driver::options::OPT_fdebug_dump_parse_tree_no_sema:
344       opts.programAction = DebugDumpParseTreeNoSema;
345       break;
346     case clang::driver::options::OPT_fdebug_dump_provenance:
347       opts.programAction = DebugDumpProvenance;
348       break;
349     case clang::driver::options::OPT_fdebug_dump_parsing_log:
350       opts.programAction = DebugDumpParsingLog;
351       break;
352     case clang::driver::options::OPT_fdebug_measure_parse_tree:
353       opts.programAction = DebugMeasureParseTree;
354       break;
355     case clang::driver::options::OPT_fdebug_pre_fir_tree:
356       opts.programAction = DebugPreFIRTree;
357       break;
358     case clang::driver::options::OPT_fget_symbols_sources:
359       opts.programAction = GetSymbolsSources;
360       break;
361     case clang::driver::options::OPT_fget_definition:
362       opts.programAction = GetDefinition;
363       break;
364     case clang::driver::options::OPT_init_only:
365       opts.programAction = InitOnly;
366       break;
367 
368       // TODO:
369       // case clang::driver::options::OPT_emit_llvm:
370       // case clang::driver::options::OPT_emit_llvm_only:
371       // case clang::driver::options::OPT_emit_codegen_only:
372       // case clang::driver::options::OPT_emit_module:
373       // (...)
374     }
375 
376     // Parse the values provided with `-fget-definition` (there should be 3
377     // integers)
378     if (llvm::opt::OptSpecifier(a->getOption().getID()) ==
379         clang::driver::options::OPT_fget_definition) {
380       unsigned optVals[3] = {0, 0, 0};
381 
382       for (unsigned i = 0; i < 3; i++) {
383         llvm::StringRef val = a->getValue(i);
384 
385         if (val.getAsInteger(10, optVals[i])) {
386           // A non-integer was encountered - that's an error.
387           diags.Report(clang::diag::err_drv_invalid_value)
388               << a->getOption().getName() << val;
389           break;
390         }
391       }
392       opts.getDefVals.line = optVals[0];
393       opts.getDefVals.startColumn = optVals[1];
394       opts.getDefVals.endColumn = optVals[2];
395     }
396   }
397 
398   // Parsing -load <dsopath> option and storing shared object path
399   if (llvm::opt::Arg *a = args.getLastArg(clang::driver::options::OPT_load)) {
400     opts.plugins.push_back(a->getValue());
401   }
402 
403   // Parsing -plugin <name> option and storing plugin name and setting action
404   if (const llvm::opt::Arg *a =
405           args.getLastArg(clang::driver::options::OPT_plugin)) {
406     opts.programAction = PluginAction;
407     opts.actionName = a->getValue();
408   }
409 
410   opts.outputFile = args.getLastArgValue(clang::driver::options::OPT_o);
411   opts.showHelp = args.hasArg(clang::driver::options::OPT_help);
412   opts.showVersion = args.hasArg(clang::driver::options::OPT_version);
413 
414   // Get the input kind (from the value passed via `-x`)
415   InputKind dashX(Language::Unknown);
416   if (const llvm::opt::Arg *a =
417           args.getLastArg(clang::driver::options::OPT_x)) {
418     llvm::StringRef xValue = a->getValue();
419     // Principal languages.
420     dashX = llvm::StringSwitch<InputKind>(xValue)
421                 // Flang does not differentiate between pre-processed and not
422                 // pre-processed inputs.
423                 .Case("f95", Language::Fortran)
424                 .Case("f95-cpp-input", Language::Fortran)
425                 .Default(Language::Unknown);
426 
427     // Flang's intermediate representations.
428     if (dashX.isUnknown())
429       dashX = llvm::StringSwitch<InputKind>(xValue)
430                   .Case("ir", Language::LLVM_IR)
431                   .Case("fir", Language::MLIR)
432                   .Case("mlir", Language::MLIR)
433                   .Default(Language::Unknown);
434 
435     if (dashX.isUnknown())
436       diags.Report(clang::diag::err_drv_invalid_value)
437           << a->getAsString(args) << a->getValue();
438   }
439 
440   // Collect the input files and save them in our instance of FrontendOptions.
441   std::vector<std::string> inputs =
442       args.getAllArgValues(clang::driver::options::OPT_INPUT);
443   opts.inputs.clear();
444   if (inputs.empty())
445     // '-' is the default input if none is given.
446     inputs.push_back("-");
447   for (unsigned i = 0, e = inputs.size(); i != e; ++i) {
448     InputKind ik = dashX;
449     if (ik.isUnknown()) {
450       ik = FrontendOptions::getInputKindForExtension(
451           llvm::StringRef(inputs[i]).rsplit('.').second);
452       if (ik.isUnknown())
453         ik = Language::Unknown;
454       if (i == 0)
455         dashX = ik;
456     }
457 
458     opts.inputs.emplace_back(std::move(inputs[i]), ik);
459   }
460 
461   // Set fortranForm based on options -ffree-form and -ffixed-form.
462   if (const auto *arg =
463           args.getLastArg(clang::driver::options::OPT_ffixed_form,
464                           clang::driver::options::OPT_ffree_form)) {
465     opts.fortranForm =
466         arg->getOption().matches(clang::driver::options::OPT_ffixed_form)
467             ? FortranForm::FixedForm
468             : FortranForm::FreeForm;
469   }
470 
471   // Set fixedFormColumns based on -ffixed-line-length=<value>
472   if (const auto *arg =
473           args.getLastArg(clang::driver::options::OPT_ffixed_line_length_EQ)) {
474     llvm::StringRef argValue = llvm::StringRef(arg->getValue());
475     std::int64_t columns = -1;
476     if (argValue == "none") {
477       columns = 0;
478     } else if (argValue.getAsInteger(/*Radix=*/10, columns)) {
479       columns = -1;
480     }
481     if (columns < 0) {
482       diags.Report(clang::diag::err_drv_negative_columns)
483           << arg->getOption().getName() << arg->getValue();
484     } else if (columns == 0) {
485       opts.fixedFormColumns = 1000000;
486     } else if (columns < 7) {
487       diags.Report(clang::diag::err_drv_small_columns)
488           << arg->getOption().getName() << arg->getValue() << "7";
489     } else {
490       opts.fixedFormColumns = columns;
491     }
492   }
493 
494   // Set conversion based on -fconvert=<value>
495   if (const auto *arg =
496           args.getLastArg(clang::driver::options::OPT_fconvert_EQ)) {
497     const char *argValue = arg->getValue();
498     if (auto convert = parseConvertArg(argValue))
499       opts.envDefaults.push_back({"FORT_CONVERT", *convert});
500     else
501       diags.Report(clang::diag::err_drv_invalid_value)
502           << arg->getAsString(args) << argValue;
503   }
504 
505   // -f{no-}implicit-none
506   opts.features.Enable(
507       Fortran::common::LanguageFeature::ImplicitNoneTypeAlways,
508       args.hasFlag(clang::driver::options::OPT_fimplicit_none,
509                    clang::driver::options::OPT_fno_implicit_none, false));
510 
511   // -f{no-}backslash
512   opts.features.Enable(Fortran::common::LanguageFeature::BackslashEscapes,
513                        args.hasFlag(clang::driver::options::OPT_fbackslash,
514                                     clang::driver::options::OPT_fno_backslash,
515                                     false));
516 
517   // -f{no-}logical-abbreviations
518   opts.features.Enable(
519       Fortran::common::LanguageFeature::LogicalAbbreviations,
520       args.hasFlag(clang::driver::options::OPT_flogical_abbreviations,
521                    clang::driver::options::OPT_fno_logical_abbreviations,
522                    false));
523 
524   // -f{no-}xor-operator
525   opts.features.Enable(
526       Fortran::common::LanguageFeature::XOROperator,
527       args.hasFlag(clang::driver::options::OPT_fxor_operator,
528                    clang::driver::options::OPT_fno_xor_operator, false));
529 
530   // -fno-automatic
531   if (args.hasArg(clang::driver::options::OPT_fno_automatic)) {
532     opts.features.Enable(Fortran::common::LanguageFeature::DefaultSave);
533   }
534 
535   if (args.hasArg(
536           clang::driver::options::OPT_falternative_parameter_statement)) {
537     opts.features.Enable(Fortran::common::LanguageFeature::OldStyleParameter);
538   }
539   if (const llvm::opt::Arg *arg =
540           args.getLastArg(clang::driver::options::OPT_finput_charset_EQ)) {
541     llvm::StringRef argValue = arg->getValue();
542     if (argValue == "utf-8") {
543       opts.encoding = Fortran::parser::Encoding::UTF_8;
544     } else if (argValue == "latin-1") {
545       opts.encoding = Fortran::parser::Encoding::LATIN_1;
546     } else {
547       diags.Report(clang::diag::err_drv_invalid_value)
548           << arg->getAsString(args) << argValue;
549     }
550   }
551 
552   setUpFrontendBasedOnAction(opts);
553   opts.dashX = dashX;
554 
555   return diags.getNumErrors() == numErrorsBefore;
556 }
557 
558 // Generate the path to look for intrinsic modules
559 static std::string getIntrinsicDir() {
560   // TODO: Find a system independent API
561   llvm::SmallString<128> driverPath;
562   driverPath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
563   llvm::sys::path::remove_filename(driverPath);
564   driverPath.append("/../include/flang/");
565   return std::string(driverPath);
566 }
567 
568 // Generate the path to look for OpenMP headers
569 static std::string getOpenMPHeadersDir() {
570   llvm::SmallString<128> includePath;
571   includePath.assign(llvm::sys::fs::getMainExecutable(nullptr, nullptr));
572   llvm::sys::path::remove_filename(includePath);
573   includePath.append("/../include/flang/OpenMP/");
574   return std::string(includePath);
575 }
576 
577 /// Parses all preprocessor input arguments and populates the preprocessor
578 /// options accordingly.
579 ///
580 /// \param [in] opts The preprocessor options instance
581 /// \param [out] args The list of input arguments
582 static void parsePreprocessorArgs(Fortran::frontend::PreprocessorOptions &opts,
583                                   llvm::opt::ArgList &args) {
584   // Add macros from the command line.
585   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_D,
586                                               clang::driver::options::OPT_U)) {
587     if (currentArg->getOption().matches(clang::driver::options::OPT_D)) {
588       opts.addMacroDef(currentArg->getValue());
589     } else {
590       opts.addMacroUndef(currentArg->getValue());
591     }
592   }
593 
594   // Add the ordered list of -I's.
595   for (const auto *currentArg : args.filtered(clang::driver::options::OPT_I))
596     opts.searchDirectoriesFromDashI.emplace_back(currentArg->getValue());
597 
598   // Prepend the ordered list of -intrinsic-modules-path
599   // to the default location to search.
600   for (const auto *currentArg :
601        args.filtered(clang::driver::options::OPT_fintrinsic_modules_path))
602     opts.searchDirectoriesFromIntrModPath.emplace_back(currentArg->getValue());
603 
604   // -cpp/-nocpp
605   if (const auto *currentArg = args.getLastArg(
606           clang::driver::options::OPT_cpp, clang::driver::options::OPT_nocpp))
607     opts.macrosFlag =
608         (currentArg->getOption().matches(clang::driver::options::OPT_cpp))
609             ? PPMacrosFlag::Include
610             : PPMacrosFlag::Exclude;
611 
612   opts.noReformat = args.hasArg(clang::driver::options::OPT_fno_reformat);
613   opts.noLineDirectives = args.hasArg(clang::driver::options::OPT_P);
614 }
615 
616 /// Parses all semantic related arguments and populates the variables
617 /// options accordingly. Returns false if new errors are generated.
618 static bool parseSemaArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
619                           clang::DiagnosticsEngine &diags) {
620   unsigned numErrorsBefore = diags.getNumErrors();
621 
622   // -J/module-dir option
623   auto moduleDirList =
624       args.getAllArgValues(clang::driver::options::OPT_module_dir);
625   // User can only specify -J/-module-dir once
626   // https://gcc.gnu.org/onlinedocs/gfortran/Directory-Options.html
627   if (moduleDirList.size() > 1) {
628     const unsigned diagID =
629         diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
630                               "Only one '-module-dir/-J' option allowed");
631     diags.Report(diagID);
632   }
633   if (moduleDirList.size() == 1)
634     res.setModuleDir(moduleDirList[0]);
635 
636   // -fdebug-module-writer option
637   if (args.hasArg(clang::driver::options::OPT_fdebug_module_writer)) {
638     res.setDebugModuleDir(true);
639   }
640 
641   // -module-suffix
642   if (const auto *moduleSuffix =
643           args.getLastArg(clang::driver::options::OPT_module_suffix)) {
644     res.setModuleFileSuffix(moduleSuffix->getValue());
645   }
646 
647   // -f{no-}analyzed-objects-for-unparse
648   res.setUseAnalyzedObjectsForUnparse(args.hasFlag(
649       clang::driver::options::OPT_fanalyzed_objects_for_unparse,
650       clang::driver::options::OPT_fno_analyzed_objects_for_unparse, true));
651 
652   return diags.getNumErrors() == numErrorsBefore;
653 }
654 
655 /// Parses all diagnostics related arguments and populates the variables
656 /// options accordingly. Returns false if new errors are generated.
657 static bool parseDiagArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
658                           clang::DiagnosticsEngine &diags) {
659   unsigned numErrorsBefore = diags.getNumErrors();
660 
661   // -Werror option
662   // TODO: Currently throws a Diagnostic for anything other than -W<error>,
663   // this has to change when other -W<opt>'s are supported.
664   if (args.hasArg(clang::driver::options::OPT_W_Joined)) {
665     const auto &wArgs =
666         args.getAllArgValues(clang::driver::options::OPT_W_Joined);
667     for (const auto &wArg : wArgs) {
668       if (wArg == "error") {
669         res.setWarnAsErr(true);
670       } else {
671         const unsigned diagID =
672             diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
673                                   "Only `-Werror` is supported currently.");
674         diags.Report(diagID);
675       }
676     }
677   }
678 
679   // Default to off for `flang-new -fc1`.
680   res.getFrontendOpts().showColors =
681       parseShowColorsArgs(args, /*defaultDiagColor=*/false);
682 
683   return diags.getNumErrors() == numErrorsBefore;
684 }
685 
686 /// Parses all Dialect related arguments and populates the variables
687 /// options accordingly. Returns false if new errors are generated.
688 static bool parseDialectArgs(CompilerInvocation &res, llvm::opt::ArgList &args,
689                              clang::DiagnosticsEngine &diags) {
690   unsigned numErrorsBefore = diags.getNumErrors();
691 
692   // -fdefault* family
693   if (args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
694     res.getDefaultKinds().set_defaultRealKind(8);
695     res.getDefaultKinds().set_doublePrecisionKind(16);
696   }
697   if (args.hasArg(clang::driver::options::OPT_fdefault_integer_8)) {
698     res.getDefaultKinds().set_defaultIntegerKind(8);
699     res.getDefaultKinds().set_subscriptIntegerKind(8);
700     res.getDefaultKinds().set_sizeIntegerKind(8);
701   }
702   if (args.hasArg(clang::driver::options::OPT_fdefault_double_8)) {
703     if (!args.hasArg(clang::driver::options::OPT_fdefault_real_8)) {
704       // -fdefault-double-8 has to be used with -fdefault-real-8
705       // to be compatible with gfortran
706       const unsigned diagID = diags.getCustomDiagID(
707           clang::DiagnosticsEngine::Error,
708           "Use of `-fdefault-double-8` requires `-fdefault-real-8`");
709       diags.Report(diagID);
710     }
711     // https://gcc.gnu.org/onlinedocs/gfortran/Fortran-Dialect-Options.html
712     res.getDefaultKinds().set_doublePrecisionKind(8);
713   }
714   if (args.hasArg(clang::driver::options::OPT_flarge_sizes))
715     res.getDefaultKinds().set_sizeIntegerKind(8);
716 
717   // -fopenmp and -fopenacc
718   if (args.hasArg(clang::driver::options::OPT_fopenacc)) {
719     res.getFrontendOpts().features.Enable(
720         Fortran::common::LanguageFeature::OpenACC);
721   }
722   if (args.hasArg(clang::driver::options::OPT_fopenmp)) {
723     res.getFrontendOpts().features.Enable(
724         Fortran::common::LanguageFeature::OpenMP);
725 
726     if (args.hasArg(clang::driver::options::OPT_fopenmp_is_device)) {
727       res.getLangOpts().OpenMPIsDevice = 1;
728 
729       // Get OpenMP host file path if any and report if a non existent file is
730       // found
731       if (auto *arg = args.getLastArg(
732               clang::driver::options::OPT_fopenmp_host_ir_file_path)) {
733         res.getLangOpts().OMPHostIRFile = arg->getValue();
734         if (!llvm::sys::fs::exists(res.getLangOpts().OMPHostIRFile))
735           diags.Report(clang::diag::err_drv_omp_host_ir_file_not_found)
736               << res.getLangOpts().OMPHostIRFile;
737       }
738 
739       if (args.hasFlag(
740               clang::driver::options::OPT_fopenmp_assume_teams_oversubscription,
741               clang::driver::options::
742                   OPT_fno_openmp_assume_teams_oversubscription,
743               /*Default=*/false))
744         res.getLangOpts().OpenMPTeamSubscription = true;
745 
746       if (args.hasArg(
747               clang::driver::options::OPT_fopenmp_assume_no_thread_state))
748         res.getLangOpts().OpenMPNoThreadState = 1;
749 
750       if (args.hasArg(
751               clang::driver::options::OPT_fopenmp_assume_no_nested_parallelism))
752         res.getLangOpts().OpenMPNoNestedParallelism = 1;
753 
754       if (args.hasFlag(clang::driver::options::
755                            OPT_fopenmp_assume_threads_oversubscription,
756                        clang::driver::options::
757                            OPT_fno_openmp_assume_threads_oversubscription,
758                        /*Default=*/false))
759         res.getLangOpts().OpenMPThreadSubscription = true;
760 
761       if ((args.hasArg(clang::driver::options::OPT_fopenmp_target_debug) ||
762            args.hasArg(clang::driver::options::OPT_fopenmp_target_debug_EQ))) {
763         res.getLangOpts().OpenMPTargetDebug = getLastArgIntValue(
764             args, clang::driver::options::OPT_fopenmp_target_debug_EQ,
765             res.getLangOpts().OpenMPTargetDebug, diags);
766 
767         if (!res.getLangOpts().OpenMPTargetDebug &&
768             args.hasArg(clang::driver::options::OPT_fopenmp_target_debug))
769           res.getLangOpts().OpenMPTargetDebug = 1;
770       }
771     }
772   }
773 
774   // -pedantic
775   if (args.hasArg(clang::driver::options::OPT_pedantic)) {
776     res.setEnableConformanceChecks();
777     res.setEnableUsageChecks();
778   }
779   // -std=f2018
780   // TODO: Set proper options when more fortran standards
781   // are supported.
782   if (args.hasArg(clang::driver::options::OPT_std_EQ)) {
783     auto standard = args.getLastArgValue(clang::driver::options::OPT_std_EQ);
784     // We only allow f2018 as the given standard
785     if (standard.equals("f2018")) {
786       res.setEnableConformanceChecks();
787     } else {
788       const unsigned diagID =
789           diags.getCustomDiagID(clang::DiagnosticsEngine::Error,
790                                 "Only -std=f2018 is allowed currently.");
791       diags.Report(diagID);
792     }
793   }
794   return diags.getNumErrors() == numErrorsBefore;
795 }
796 
797 /// Parses all floating point related arguments and populates the
798 /// CompilerInvocation accordingly.
799 /// Returns false if new errors are generated.
800 ///
801 /// \param [out] invoc Stores the processed arguments
802 /// \param [in] args The compiler invocation arguments to parse
803 /// \param [out] diags DiagnosticsEngine to report erros with
804 static bool parseFloatingPointArgs(CompilerInvocation &invoc,
805                                    llvm::opt::ArgList &args,
806                                    clang::DiagnosticsEngine &diags) {
807   LangOptions &opts = invoc.getLangOpts();
808 
809   if (const llvm::opt::Arg *a =
810           args.getLastArg(clang::driver::options::OPT_ffp_contract)) {
811     const llvm::StringRef val = a->getValue();
812     enum LangOptions::FPModeKind fpContractMode;
813 
814     if (val == "off")
815       fpContractMode = LangOptions::FPM_Off;
816     else if (val == "fast")
817       fpContractMode = LangOptions::FPM_Fast;
818     else {
819       diags.Report(clang::diag::err_drv_unsupported_option_argument)
820           << a->getSpelling() << val;
821       return false;
822     }
823 
824     opts.setFPContractMode(fpContractMode);
825   }
826 
827   if (args.getLastArg(clang::driver::options::OPT_menable_no_infinities)) {
828     opts.NoHonorInfs = true;
829   }
830 
831   if (args.getLastArg(clang::driver::options::OPT_menable_no_nans)) {
832     opts.NoHonorNaNs = true;
833   }
834 
835   if (args.getLastArg(clang::driver::options::OPT_fapprox_func)) {
836     opts.ApproxFunc = true;
837   }
838 
839   if (args.getLastArg(clang::driver::options::OPT_fno_signed_zeros)) {
840     opts.NoSignedZeros = true;
841   }
842 
843   if (args.getLastArg(clang::driver::options::OPT_mreassociate)) {
844     opts.AssociativeMath = true;
845   }
846 
847   if (args.getLastArg(clang::driver::options::OPT_freciprocal_math)) {
848     opts.ReciprocalMath = true;
849   }
850 
851   if (args.getLastArg(clang::driver::options::OPT_ffast_math)) {
852     opts.NoHonorInfs = true;
853     opts.NoHonorNaNs = true;
854     opts.AssociativeMath = true;
855     opts.ReciprocalMath = true;
856     opts.ApproxFunc = true;
857     opts.NoSignedZeros = true;
858     opts.setFPContractMode(LangOptions::FPM_Fast);
859   }
860 
861   return true;
862 }
863 
864 bool CompilerInvocation::createFromArgs(
865     CompilerInvocation &res, llvm::ArrayRef<const char *> commandLineArgs,
866     clang::DiagnosticsEngine &diags) {
867 
868   bool success = true;
869 
870   // Set the default triple for this CompilerInvocation. This might be
871   // overridden by users with `-triple` (see the call to `ParseTargetArgs`
872   // below).
873   // NOTE: Like in Clang, it would be nice to use option marshalling
874   // for this so that the entire logic for setting-up the triple is in one
875   // place.
876   res.getTargetOpts().triple =
877       llvm::Triple::normalize(llvm::sys::getDefaultTargetTriple());
878 
879   // Parse the arguments
880   const llvm::opt::OptTable &opts = clang::driver::getDriverOptTable();
881   const unsigned includedFlagsBitmask = clang::driver::options::FC1Option;
882   unsigned missingArgIndex, missingArgCount;
883   llvm::opt::InputArgList args = opts.ParseArgs(
884       commandLineArgs, missingArgIndex, missingArgCount, includedFlagsBitmask);
885 
886   // Check for missing argument error.
887   if (missingArgCount) {
888     diags.Report(clang::diag::err_drv_missing_argument)
889         << args.getArgString(missingArgIndex) << missingArgCount;
890     success = false;
891   }
892 
893   // Issue errors on unknown arguments
894   for (const auto *a : args.filtered(clang::driver::options::OPT_UNKNOWN)) {
895     auto argString = a->getAsString(args);
896     std::string nearest;
897     if (opts.findNearest(argString, nearest, includedFlagsBitmask) > 1)
898       diags.Report(clang::diag::err_drv_unknown_argument) << argString;
899     else
900       diags.Report(clang::diag::err_drv_unknown_argument_with_suggestion)
901           << argString << nearest;
902     success = false;
903   }
904 
905   // -flang-experimental-hlfir
906   if (args.hasArg(clang::driver::options::OPT_flang_experimental_hlfir)) {
907     res.loweringOpts.setLowerToHighLevelFIR(true);
908   }
909 
910   success &= parseFrontendArgs(res.getFrontendOpts(), args, diags);
911   parseTargetArgs(res.getTargetOpts(), args);
912   parsePreprocessorArgs(res.getPreprocessorOpts(), args);
913   parseCodeGenArgs(res.getCodeGenOpts(), args, diags);
914   success &= parseDebugArgs(res.getCodeGenOpts(), args, diags);
915   success &= parseSemaArgs(res, args, diags);
916   success &= parseDialectArgs(res, args, diags);
917   success &= parseDiagArgs(res, args, diags);
918   res.frontendOpts.llvmArgs =
919       args.getAllArgValues(clang::driver::options::OPT_mllvm);
920 
921   res.frontendOpts.mlirArgs =
922       args.getAllArgValues(clang::driver::options::OPT_mmlir);
923 
924   success &= parseFloatingPointArgs(res, args, diags);
925 
926   return success;
927 }
928 
929 void CompilerInvocation::collectMacroDefinitions() {
930   auto &ppOpts = this->getPreprocessorOpts();
931 
932   for (unsigned i = 0, n = ppOpts.macros.size(); i != n; ++i) {
933     llvm::StringRef macro = ppOpts.macros[i].first;
934     bool isUndef = ppOpts.macros[i].second;
935 
936     std::pair<llvm::StringRef, llvm::StringRef> macroPair = macro.split('=');
937     llvm::StringRef macroName = macroPair.first;
938     llvm::StringRef macroBody = macroPair.second;
939 
940     // For an #undef'd macro, we only care about the name.
941     if (isUndef) {
942       parserOpts.predefinitions.emplace_back(macroName.str(),
943                                              std::optional<std::string>{});
944       continue;
945     }
946 
947     // For a #define'd macro, figure out the actual definition.
948     if (macroName.size() == macro.size())
949       macroBody = "1";
950     else {
951       // Note: GCC drops anything following an end-of-line character.
952       llvm::StringRef::size_type end = macroBody.find_first_of("\n\r");
953       macroBody = macroBody.substr(0, end);
954     }
955     parserOpts.predefinitions.emplace_back(
956         macroName, std::optional<std::string>(macroBody.str()));
957   }
958 }
959 
960 void CompilerInvocation::setDefaultFortranOpts() {
961   auto &fortranOptions = getFortranOpts();
962 
963   std::vector<std::string> searchDirectories{"."s};
964   fortranOptions.searchDirectories = searchDirectories;
965 
966   // Add the location of omp_lib.h to the search directories. Currently this is
967   // identical to the modules' directory.
968   fortranOptions.searchDirectories.emplace_back(getOpenMPHeadersDir());
969 
970   fortranOptions.isFixedForm = false;
971 }
972 
973 // TODO: When expanding this method, consider creating a dedicated API for
974 // this. Also at some point we will need to differentiate between different
975 // targets and add dedicated predefines for each.
976 void CompilerInvocation::setDefaultPredefinitions() {
977   auto &fortranOptions = getFortranOpts();
978   const auto &frontendOptions = getFrontendOpts();
979 
980   // Populate the macro list with version numbers and other predefinitions.
981   fortranOptions.predefinitions.emplace_back("__flang__", "1");
982   fortranOptions.predefinitions.emplace_back("__flang_major__",
983                                              FLANG_VERSION_MAJOR_STRING);
984   fortranOptions.predefinitions.emplace_back("__flang_minor__",
985                                              FLANG_VERSION_MINOR_STRING);
986   fortranOptions.predefinitions.emplace_back("__flang_patchlevel__",
987                                              FLANG_VERSION_PATCHLEVEL_STRING);
988 
989   // Add predefinitions based on extensions enabled
990   if (frontendOptions.features.IsEnabled(
991           Fortran::common::LanguageFeature::OpenACC)) {
992     fortranOptions.predefinitions.emplace_back("_OPENACC", "202011");
993   }
994   if (frontendOptions.features.IsEnabled(
995           Fortran::common::LanguageFeature::OpenMP)) {
996     fortranOptions.predefinitions.emplace_back("_OPENMP", "201511");
997   }
998   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
999   if (targetTriple.getArch() == llvm::Triple::ArchType::x86_64) {
1000     fortranOptions.predefinitions.emplace_back("__x86_64__", "1");
1001     fortranOptions.predefinitions.emplace_back("__x86_64", "1");
1002   }
1003 }
1004 
1005 void CompilerInvocation::setFortranOpts() {
1006   auto &fortranOptions = getFortranOpts();
1007   const auto &frontendOptions = getFrontendOpts();
1008   const auto &preprocessorOptions = getPreprocessorOpts();
1009   auto &moduleDirJ = getModuleDir();
1010 
1011   if (frontendOptions.fortranForm != FortranForm::Unknown) {
1012     fortranOptions.isFixedForm =
1013         frontendOptions.fortranForm == FortranForm::FixedForm;
1014   }
1015   fortranOptions.fixedFormColumns = frontendOptions.fixedFormColumns;
1016 
1017   fortranOptions.features = frontendOptions.features;
1018   fortranOptions.encoding = frontendOptions.encoding;
1019 
1020   // Adding search directories specified by -I
1021   fortranOptions.searchDirectories.insert(
1022       fortranOptions.searchDirectories.end(),
1023       preprocessorOptions.searchDirectoriesFromDashI.begin(),
1024       preprocessorOptions.searchDirectoriesFromDashI.end());
1025 
1026   // Add the ordered list of -intrinsic-modules-path
1027   fortranOptions.searchDirectories.insert(
1028       fortranOptions.searchDirectories.end(),
1029       preprocessorOptions.searchDirectoriesFromIntrModPath.begin(),
1030       preprocessorOptions.searchDirectoriesFromIntrModPath.end());
1031 
1032   //  Add the default intrinsic module directory
1033   fortranOptions.intrinsicModuleDirectories.emplace_back(getIntrinsicDir());
1034 
1035   // Add the directory supplied through -J/-module-dir to the list of search
1036   // directories
1037   if (moduleDirJ != ".")
1038     fortranOptions.searchDirectories.emplace_back(moduleDirJ);
1039 
1040   if (frontendOptions.instrumentedParse)
1041     fortranOptions.instrumentedParse = true;
1042 
1043   if (frontendOptions.showColors)
1044     fortranOptions.showColors = true;
1045 
1046   if (frontendOptions.needProvenanceRangeToCharBlockMappings)
1047     fortranOptions.needProvenanceRangeToCharBlockMappings = true;
1048 
1049   if (getEnableConformanceChecks())
1050     fortranOptions.features.WarnOnAllNonstandard();
1051 
1052   if (getEnableUsageChecks())
1053     fortranOptions.features.WarnOnAllUsage();
1054 }
1055 
1056 void CompilerInvocation::setSemanticsOpts(
1057     Fortran::parser::AllCookedSources &allCookedSources) {
1058   auto &fortranOptions = getFortranOpts();
1059 
1060   semanticsContext = std::make_unique<semantics::SemanticsContext>(
1061       getDefaultKinds(), fortranOptions.features, allCookedSources);
1062 
1063   semanticsContext->set_moduleDirectory(getModuleDir())
1064       .set_searchDirectories(fortranOptions.searchDirectories)
1065       .set_intrinsicModuleDirectories(fortranOptions.intrinsicModuleDirectories)
1066       .set_warningsAreErrors(getWarnAsErr())
1067       .set_moduleFileSuffix(getModuleFileSuffix());
1068 
1069   llvm::Triple targetTriple{llvm::Triple(this->targetOpts.triple)};
1070   // FIXME: Handle real(3) ?
1071   if (targetTriple.getArch() != llvm::Triple::ArchType::x86_64) {
1072     semanticsContext->targetCharacteristics().DisableType(
1073         Fortran::common::TypeCategory::Real, /*kind=*/10);
1074   }
1075 }
1076 
1077 /// Set \p loweringOptions controlling lowering behavior based
1078 /// on the \p optimizationLevel.
1079 void CompilerInvocation::setLoweringOptions() {
1080   const CodeGenOptions &codegenOpts = getCodeGenOpts();
1081 
1082   // Lower TRANSPOSE as a runtime call under -O0.
1083   loweringOpts.setOptimizeTranspose(codegenOpts.OptimizationLevel > 0);
1084 
1085   const LangOptions &langOptions = getLangOpts();
1086   Fortran::common::MathOptionsBase &mathOpts = loweringOpts.getMathOptions();
1087   // TODO: when LangOptions are finalized, we can represent
1088   //       the math related options using Fortran::commmon::MathOptionsBase,
1089   //       so that we can just copy it into LoweringOptions.
1090   mathOpts
1091       .setFPContractEnabled(langOptions.getFPContractMode() ==
1092                             LangOptions::FPM_Fast)
1093       .setNoHonorInfs(langOptions.NoHonorInfs)
1094       .setNoHonorNaNs(langOptions.NoHonorNaNs)
1095       .setApproxFunc(langOptions.ApproxFunc)
1096       .setNoSignedZeros(langOptions.NoSignedZeros)
1097       .setAssociativeMath(langOptions.AssociativeMath)
1098       .setReciprocalMath(langOptions.ReciprocalMath);
1099 }
1100