1 //===-- lib/Parser/program-parsers.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 // Per-type parsers for program units 10 11 #include "basic-parsers.h" 12 #include "debug-parser.h" 13 #include "expr-parsers.h" 14 #include "misc-parsers.h" 15 #include "stmt-parser.h" 16 #include "token-parsers.h" 17 #include "type-parser-implementation.h" 18 #include "flang/Parser/characters.h" 19 #include "flang/Parser/parse-tree.h" 20 21 namespace Fortran::parser { 22 23 // R501 program -> program-unit [program-unit]... 24 // This is the top-level production for the Fortran language. 25 // F'2018 6.3.1 defines a program unit as a sequence of one or more lines, 26 // implying that a line can't be part of two distinct program units. 27 // Consequently, a program unit END statement should be the last statement 28 // on its line. We parse those END statements via unterminatedStatement() 29 // and then skip over the end of the line here. 30 TYPE_PARSER(construct<Program>( 31 extension<LanguageFeature::EmptySourceFile>(skipStuffBeforeStatement >> 32 !nextCh >> defaulted(cut >> some(Parser<ProgramUnit>{}))) || 33 some(StartNewSubprogram{} >> Parser<ProgramUnit>{} / skipMany(";"_tok) / 34 space / recovery(endOfLine, SkipPast<'\n'>{})) / 35 skipStuffBeforeStatement)) 36 37 // R502 program-unit -> 38 // main-program | external-subprogram | module | submodule | block-data 39 // R503 external-subprogram -> function-subprogram | subroutine-subprogram 40 // N.B. "module" must precede "external-subprogram" in this sequence of 41 // alternatives to avoid ambiguity with the MODULE keyword prefix that 42 // they recognize. I.e., "modulesubroutinefoo" should start a module 43 // "subroutinefoo", not a subroutine "foo" with the MODULE prefix. The 44 // ambiguity is exacerbated by the extension that accepts a function 45 // statement without an otherwise empty list of dummy arguments. That 46 // MODULE prefix is disallowed by a constraint (C1547) in this context, 47 // so the standard language is not ambiguous, but disabling its misrecognition 48 // here would require context-sensitive keyword recognition or (or via) 49 // variant parsers for several productions; giving the "module" production 50 // priority here is a cleaner solution, though regrettably subtle. Enforcing 51 // C1547 is done in semantics. 52 TYPE_PARSER(construct<ProgramUnit>(indirect(Parser<Module>{})) || 53 construct<ProgramUnit>(indirect(functionSubprogram)) || 54 construct<ProgramUnit>(indirect(subroutineSubprogram)) || 55 construct<ProgramUnit>(indirect(Parser<Submodule>{})) || 56 construct<ProgramUnit>(indirect(Parser<BlockData>{})) || 57 construct<ProgramUnit>(indirect(Parser<MainProgram>{}))) 58 59 // R504 specification-part -> 60 // [use-stmt]... [import-stmt]... [implicit-part] 61 // [declaration-construct]... 62 TYPE_CONTEXT_PARSER("specification part"_en_US, 63 construct<SpecificationPart>(many(openmpDeclarativeConstruct), 64 many(statement(indirect(Parser<UseStmt>{}))), 65 many(unambiguousStatement(indirect(Parser<ImportStmt>{}))), 66 implicitPart, many(declarationConstruct))) 67 68 // R507 declaration-construct -> 69 // specification-construct | data-stmt | format-stmt | 70 // entry-stmt | stmt-function-stmt 71 // N.B. These parsers incorporate recognition of some other statements that 72 // may have been misplaced in the sequence of statements that are acceptable 73 // as a specification part in order to improve error recovery. 74 // Also note that many instances of specification-part in the standard grammar 75 // are in contexts that impose constraints on the kinds of statements that 76 // are allowed, and so we have a variant production for declaration-construct 77 // that implements those constraints. 78 constexpr auto execPartLookAhead{ 79 first(actionStmt >> ok, ompEndLoopDirective >> ok, openmpConstruct >> ok, 80 "ASSOCIATE ("_tok, "BLOCK"_tok, "SELECT"_tok, "CHANGE TEAM"_sptok, 81 "CRITICAL"_tok, "DO"_tok, "IF ("_tok, "WHERE ("_tok, "FORALL ("_tok)}; 82 constexpr auto declErrorRecovery{ 83 stmtErrorRecoveryStart >> !execPartLookAhead >> skipStmtErrorRecovery}; 84 constexpr auto misplacedSpecificationStmt{Parser<UseStmt>{} >> 85 fail<DeclarationConstruct>("misplaced USE statement"_err_en_US) || 86 Parser<ImportStmt>{} >> 87 fail<DeclarationConstruct>( 88 "IMPORT statements must follow any USE statements and precede all other declarations"_err_en_US) || 89 Parser<ImplicitStmt>{} >> 90 fail<DeclarationConstruct>( 91 "IMPLICIT statements must follow USE and IMPORT and precede all other declarations"_err_en_US)}; 92 93 TYPE_PARSER(recovery( 94 withMessage("expected declaration construct"_err_en_US, 95 CONTEXT_PARSER("declaration construct"_en_US, 96 first(construct<DeclarationConstruct>(specificationConstruct), 97 construct<DeclarationConstruct>(statement(indirect(dataStmt))), 98 construct<DeclarationConstruct>( 99 statement(indirect(formatStmt))), 100 construct<DeclarationConstruct>(statement(indirect(entryStmt))), 101 construct<DeclarationConstruct>( 102 statement(indirect(Parser<StmtFunctionStmt>{}))), 103 misplacedSpecificationStmt))), 104 construct<DeclarationConstruct>(declErrorRecovery))) 105 106 // R507 variant of declaration-construct for use in limitedSpecificationPart. 107 constexpr auto invalidDeclarationStmt{formatStmt >> 108 fail<DeclarationConstruct>( 109 "FORMAT statements are not permitted in this specification part"_err_en_US) || 110 entryStmt >> 111 fail<DeclarationConstruct>( 112 "ENTRY statements are not permitted in this specification part"_err_en_US)}; 113 114 constexpr auto limitedDeclarationConstruct{recovery( 115 withMessage("expected declaration construct"_err_en_US, 116 inContext("declaration construct"_en_US, 117 first(construct<DeclarationConstruct>(specificationConstruct), 118 construct<DeclarationConstruct>(statement(indirect(dataStmt))), 119 misplacedSpecificationStmt, invalidDeclarationStmt))), 120 construct<DeclarationConstruct>( 121 stmtErrorRecoveryStart >> skipStmtErrorRecovery))}; 122 123 // R504 variant for many contexts (modules, submodules, BLOCK DATA subprograms, 124 // and interfaces) which have constraints on their specification parts that 125 // preclude FORMAT, ENTRY, and statement functions, and benefit from 126 // specialized error recovery in the event of a spurious executable 127 // statement. 128 constexpr auto limitedSpecificationPart{inContext("specification part"_en_US, 129 construct<SpecificationPart>(many(openmpDeclarativeConstruct), 130 many(statement(indirect(Parser<UseStmt>{}))), 131 many(unambiguousStatement(indirect(Parser<ImportStmt>{}))), 132 implicitPart, many(limitedDeclarationConstruct)))}; 133 134 // R508 specification-construct -> 135 // derived-type-def | enum-def | generic-stmt | interface-block | 136 // parameter-stmt | procedure-declaration-stmt | 137 // other-specification-stmt | type-declaration-stmt 138 TYPE_CONTEXT_PARSER("specification construct"_en_US, 139 first(construct<SpecificationConstruct>(indirect(Parser<DerivedTypeDef>{})), 140 construct<SpecificationConstruct>(indirect(Parser<EnumDef>{})), 141 construct<SpecificationConstruct>( 142 statement(indirect(Parser<GenericStmt>{}))), 143 construct<SpecificationConstruct>(indirect(interfaceBlock)), 144 construct<SpecificationConstruct>(statement(indirect(parameterStmt))), 145 construct<SpecificationConstruct>( 146 statement(indirect(oldParameterStmt))), 147 construct<SpecificationConstruct>( 148 statement(indirect(Parser<ProcedureDeclarationStmt>{}))), 149 construct<SpecificationConstruct>( 150 statement(Parser<OtherSpecificationStmt>{})), 151 construct<SpecificationConstruct>( 152 statement(indirect(typeDeclarationStmt))), 153 construct<SpecificationConstruct>(indirect(Parser<StructureDef>{})), 154 construct<SpecificationConstruct>(indirect(openmpDeclarativeConstruct)), 155 construct<SpecificationConstruct>(indirect(compilerDirective)))) 156 157 // R513 other-specification-stmt -> 158 // access-stmt | allocatable-stmt | asynchronous-stmt | bind-stmt | 159 // codimension-stmt | contiguous-stmt | dimension-stmt | external-stmt | 160 // intent-stmt | intrinsic-stmt | namelist-stmt | optional-stmt | 161 // pointer-stmt | protected-stmt | save-stmt | target-stmt | 162 // volatile-stmt | value-stmt | common-stmt | equivalence-stmt 163 TYPE_PARSER(first( 164 construct<OtherSpecificationStmt>(indirect(Parser<AccessStmt>{})), 165 construct<OtherSpecificationStmt>(indirect(Parser<AllocatableStmt>{})), 166 construct<OtherSpecificationStmt>(indirect(Parser<AsynchronousStmt>{})), 167 construct<OtherSpecificationStmt>(indirect(Parser<BindStmt>{})), 168 construct<OtherSpecificationStmt>(indirect(Parser<CodimensionStmt>{})), 169 construct<OtherSpecificationStmt>(indirect(Parser<ContiguousStmt>{})), 170 construct<OtherSpecificationStmt>(indirect(Parser<DimensionStmt>{})), 171 construct<OtherSpecificationStmt>(indirect(Parser<ExternalStmt>{})), 172 construct<OtherSpecificationStmt>(indirect(Parser<IntentStmt>{})), 173 construct<OtherSpecificationStmt>(indirect(Parser<IntrinsicStmt>{})), 174 construct<OtherSpecificationStmt>(indirect(Parser<NamelistStmt>{})), 175 construct<OtherSpecificationStmt>(indirect(Parser<OptionalStmt>{})), 176 construct<OtherSpecificationStmt>(indirect(Parser<PointerStmt>{})), 177 construct<OtherSpecificationStmt>(indirect(Parser<ProtectedStmt>{})), 178 construct<OtherSpecificationStmt>(indirect(Parser<SaveStmt>{})), 179 construct<OtherSpecificationStmt>(indirect(Parser<TargetStmt>{})), 180 construct<OtherSpecificationStmt>(indirect(Parser<ValueStmt>{})), 181 construct<OtherSpecificationStmt>(indirect(Parser<VolatileStmt>{})), 182 construct<OtherSpecificationStmt>(indirect(Parser<CommonStmt>{})), 183 construct<OtherSpecificationStmt>(indirect(Parser<EquivalenceStmt>{})), 184 construct<OtherSpecificationStmt>(indirect(Parser<BasedPointerStmt>{})))) 185 186 // R1401 main-program -> 187 // [program-stmt] [specification-part] [execution-part] 188 // [internal-subprogram-part] end-program-stmt 189 TYPE_CONTEXT_PARSER("main program"_en_US, 190 construct<MainProgram>(maybe(statement(Parser<ProgramStmt>{})), 191 specificationPart, executionPart, maybe(internalSubprogramPart), 192 unterminatedStatement(Parser<EndProgramStmt>{}))) 193 194 // R1402 program-stmt -> PROGRAM program-name 195 // PGI allows empty parentheses after the name. 196 TYPE_CONTEXT_PARSER("PROGRAM statement"_en_US, 197 construct<ProgramStmt>("PROGRAM" >> name / 198 maybe(extension<LanguageFeature::ProgramParentheses>( 199 parenthesized(ok))))) 200 201 // R1403 end-program-stmt -> END [PROGRAM [program-name]] 202 TYPE_CONTEXT_PARSER("END PROGRAM statement"_en_US, 203 construct<EndProgramStmt>(recovery( 204 "END PROGRAM" >> maybe(name) || bareEnd, progUnitEndStmtErrorRecovery))) 205 206 // R1404 module -> 207 // module-stmt [specification-part] [module-subprogram-part] 208 // end-module-stmt 209 TYPE_CONTEXT_PARSER("module"_en_US, 210 construct<Module>(statement(Parser<ModuleStmt>{}), limitedSpecificationPart, 211 maybe(Parser<ModuleSubprogramPart>{}), 212 unterminatedStatement(Parser<EndModuleStmt>{}))) 213 214 // R1405 module-stmt -> MODULE module-name 215 TYPE_CONTEXT_PARSER( 216 "MODULE statement"_en_US, construct<ModuleStmt>("MODULE" >> name)) 217 218 // R1406 end-module-stmt -> END [MODULE [module-name]] 219 TYPE_CONTEXT_PARSER("END MODULE statement"_en_US, 220 construct<EndModuleStmt>(recovery( 221 "END MODULE" >> maybe(name) || bareEnd, progUnitEndStmtErrorRecovery))) 222 223 // R1407 module-subprogram-part -> contains-stmt [module-subprogram]... 224 TYPE_CONTEXT_PARSER("module subprogram part"_en_US, 225 construct<ModuleSubprogramPart>(statement(containsStmt), 226 many(StartNewSubprogram{} >> Parser<ModuleSubprogram>{}))) 227 228 // R1408 module-subprogram -> 229 // function-subprogram | subroutine-subprogram | 230 // separate-module-subprogram 231 TYPE_PARSER(construct<ModuleSubprogram>(indirect(functionSubprogram)) || 232 construct<ModuleSubprogram>(indirect(subroutineSubprogram)) || 233 construct<ModuleSubprogram>(indirect(Parser<SeparateModuleSubprogram>{}))) 234 235 // R1410 module-nature -> INTRINSIC | NON_INTRINSIC 236 constexpr auto moduleNature{ 237 "INTRINSIC" >> pure(UseStmt::ModuleNature::Intrinsic) || 238 "NON_INTRINSIC" >> pure(UseStmt::ModuleNature::Non_Intrinsic)}; 239 240 // R1409 use-stmt -> 241 // USE [[, module-nature] ::] module-name [, rename-list] | 242 // USE [[, module-nature] ::] module-name , ONLY : [only-list] 243 // N.B. Lookahead to the end of the statement is necessary to resolve 244 // ambiguity with assignments and statement function definitions that 245 // begin with the letters "USE". 246 TYPE_PARSER(construct<UseStmt>("USE" >> optionalBeforeColons(moduleNature), 247 name, ", ONLY :" >> optionalList(Parser<Only>{})) || 248 construct<UseStmt>("USE" >> optionalBeforeColons(moduleNature), name, 249 defaulted("," >> 250 nonemptyList("expected renamings"_err_en_US, Parser<Rename>{})) / 251 lookAhead(endOfStmt))) 252 253 // R1411 rename -> 254 // local-name => use-name | 255 // OPERATOR ( local-defined-operator ) => 256 // OPERATOR ( use-defined-operator ) 257 TYPE_PARSER(construct<Rename>("OPERATOR (" >> 258 construct<Rename::Operators>( 259 definedOpName / ") => OPERATOR (", definedOpName / ")")) || 260 construct<Rename>(construct<Rename::Names>(name, "=>" >> name))) 261 262 // R1412 only -> generic-spec | only-use-name | rename 263 // R1413 only-use-name -> use-name 264 TYPE_PARSER(construct<Only>(Parser<Rename>{}) || 265 construct<Only>(indirect(genericSpec)) || 266 construct<Only>(name)) // TODO: ambiguous, accepted by genericSpec 267 268 // R1416 submodule -> 269 // submodule-stmt [specification-part] [module-subprogram-part] 270 // end-submodule-stmt 271 TYPE_CONTEXT_PARSER("submodule"_en_US, 272 construct<Submodule>(statement(Parser<SubmoduleStmt>{}), 273 limitedSpecificationPart, maybe(Parser<ModuleSubprogramPart>{}), 274 unterminatedStatement(Parser<EndSubmoduleStmt>{}))) 275 276 // R1417 submodule-stmt -> SUBMODULE ( parent-identifier ) submodule-name 277 TYPE_CONTEXT_PARSER("SUBMODULE statement"_en_US, 278 construct<SubmoduleStmt>( 279 "SUBMODULE" >> parenthesized(Parser<ParentIdentifier>{}), name)) 280 281 // R1418 parent-identifier -> ancestor-module-name [: parent-submodule-name] 282 TYPE_PARSER(construct<ParentIdentifier>(name, maybe(":" >> name))) 283 284 // R1419 end-submodule-stmt -> END [SUBMODULE [submodule-name]] 285 TYPE_CONTEXT_PARSER("END SUBMODULE statement"_en_US, 286 construct<EndSubmoduleStmt>( 287 recovery("END SUBMODULE" >> maybe(name) || bareEnd, 288 progUnitEndStmtErrorRecovery))) 289 290 // R1420 block-data -> block-data-stmt [specification-part] end-block-data-stmt 291 TYPE_CONTEXT_PARSER("BLOCK DATA subprogram"_en_US, 292 construct<BlockData>(statement(Parser<BlockDataStmt>{}), 293 limitedSpecificationPart, 294 unterminatedStatement(Parser<EndBlockDataStmt>{}))) 295 296 // R1421 block-data-stmt -> BLOCK DATA [block-data-name] 297 TYPE_CONTEXT_PARSER("BLOCK DATA statement"_en_US, 298 construct<BlockDataStmt>("BLOCK DATA" >> maybe(name))) 299 300 // R1422 end-block-data-stmt -> END [BLOCK DATA [block-data-name]] 301 TYPE_CONTEXT_PARSER("END BLOCK DATA statement"_en_US, 302 construct<EndBlockDataStmt>( 303 recovery("END BLOCK DATA" >> maybe(name) || bareEnd, 304 progUnitEndStmtErrorRecovery))) 305 306 // R1501 interface-block -> 307 // interface-stmt [interface-specification]... end-interface-stmt 308 TYPE_PARSER(construct<InterfaceBlock>(statement(Parser<InterfaceStmt>{}), 309 many(Parser<InterfaceSpecification>{}), 310 statement(Parser<EndInterfaceStmt>{}))) 311 312 // R1502 interface-specification -> interface-body | procedure-stmt 313 TYPE_PARSER(construct<InterfaceSpecification>(Parser<InterfaceBody>{}) || 314 construct<InterfaceSpecification>(statement(Parser<ProcedureStmt>{}))) 315 316 // R1503 interface-stmt -> INTERFACE [generic-spec] | ABSTRACT INTERFACE 317 TYPE_PARSER(construct<InterfaceStmt>("INTERFACE" >> maybe(genericSpec)) || 318 construct<InterfaceStmt>(construct<Abstract>("ABSTRACT INTERFACE"_sptok))) 319 320 // R1504 end-interface-stmt -> END INTERFACE [generic-spec] 321 TYPE_PARSER(construct<EndInterfaceStmt>("END INTERFACE" >> maybe(genericSpec))) 322 323 // R1505 interface-body -> 324 // function-stmt [specification-part] end-function-stmt | 325 // subroutine-stmt [specification-part] end-subroutine-stmt 326 TYPE_CONTEXT_PARSER("interface body"_en_US, 327 construct<InterfaceBody>( 328 construct<InterfaceBody::Function>(statement(functionStmt), 329 indirect(limitedSpecificationPart), statement(endFunctionStmt))) || 330 construct<InterfaceBody>(construct<InterfaceBody::Subroutine>( 331 statement(subroutineStmt), indirect(limitedSpecificationPart), 332 statement(endSubroutineStmt)))) 333 334 // R1507 specific-procedure -> procedure-name 335 constexpr auto specificProcedures{ 336 nonemptyList("expected specific procedure names"_err_en_US, name)}; 337 338 // R1506 procedure-stmt -> [MODULE] PROCEDURE [::] specific-procedure-list 339 TYPE_PARSER(construct<ProcedureStmt>("MODULE PROCEDURE"_sptok >> 340 pure(ProcedureStmt::Kind::ModuleProcedure), 341 maybe("::"_tok) >> specificProcedures) || 342 construct<ProcedureStmt>( 343 "PROCEDURE" >> pure(ProcedureStmt::Kind::Procedure), 344 maybe("::"_tok) >> specificProcedures)) 345 346 // R1508 generic-spec -> 347 // generic-name | OPERATOR ( defined-operator ) | 348 // ASSIGNMENT ( = ) | defined-io-generic-spec 349 // R1509 defined-io-generic-spec -> 350 // READ ( FORMATTED ) | READ ( UNFORMATTED ) | 351 // WRITE ( FORMATTED ) | WRITE ( UNFORMATTED ) 352 TYPE_PARSER(sourced(first(construct<GenericSpec>("OPERATOR" >> 353 parenthesized(Parser<DefinedOperator>{})), 354 construct<GenericSpec>( 355 construct<GenericSpec::Assignment>("ASSIGNMENT ( = )"_tok)), 356 construct<GenericSpec>( 357 construct<GenericSpec::ReadFormatted>("READ ( FORMATTED )"_tok)), 358 construct<GenericSpec>( 359 construct<GenericSpec::ReadUnformatted>("READ ( UNFORMATTED )"_tok)), 360 construct<GenericSpec>( 361 construct<GenericSpec::WriteFormatted>("WRITE ( FORMATTED )"_tok)), 362 construct<GenericSpec>( 363 construct<GenericSpec::WriteUnformatted>("WRITE ( UNFORMATTED )"_tok)), 364 construct<GenericSpec>(name)))) 365 366 // R1510 generic-stmt -> 367 // GENERIC [, access-spec] :: generic-spec => specific-procedure-list 368 TYPE_PARSER(construct<GenericStmt>("GENERIC" >> maybe("," >> accessSpec), 369 "::" >> genericSpec, "=>" >> specificProcedures)) 370 371 // R1511 external-stmt -> EXTERNAL [::] external-name-list 372 TYPE_PARSER( 373 "EXTERNAL" >> maybe("::"_tok) >> construct<ExternalStmt>(listOfNames)) 374 375 // R1512 procedure-declaration-stmt -> 376 // PROCEDURE ( [proc-interface] ) [[, proc-attr-spec]... ::] 377 // proc-decl-list 378 TYPE_PARSER("PROCEDURE" >> 379 construct<ProcedureDeclarationStmt>(parenthesized(maybe(procInterface)), 380 optionalListBeforeColons(Parser<ProcAttrSpec>{}), 381 nonemptyList("expected procedure declarations"_err_en_US, procDecl))) 382 383 // R1513 proc-interface -> interface-name | declaration-type-spec 384 // R1516 interface-name -> name 385 // N.B. Simple names of intrinsic types (e.g., "REAL") are not 386 // ambiguous here - they take precedence over derived type names 387 // thanks to C1516. 388 TYPE_PARSER( 389 construct<ProcInterface>(declarationTypeSpec / lookAhead(")"_tok)) || 390 construct<ProcInterface>(name)) 391 392 // R1514 proc-attr-spec -> 393 // access-spec | proc-language-binding-spec | INTENT ( intent-spec ) | 394 // OPTIONAL | POINTER | PROTECTED | SAVE 395 TYPE_PARSER(construct<ProcAttrSpec>(accessSpec) || 396 construct<ProcAttrSpec>(languageBindingSpec) || 397 construct<ProcAttrSpec>("INTENT" >> parenthesized(intentSpec)) || 398 construct<ProcAttrSpec>(optional) || construct<ProcAttrSpec>(pointer) || 399 construct<ProcAttrSpec>(protectedAttr) || construct<ProcAttrSpec>(save)) 400 401 // R1515 proc-decl -> procedure-entity-name [=> proc-pointer-init] 402 TYPE_PARSER(construct<ProcDecl>(name, maybe("=>" >> Parser<ProcPointerInit>{}))) 403 404 // R1517 proc-pointer-init -> null-init | initial-proc-target 405 // R1518 initial-proc-target -> procedure-name 406 TYPE_PARSER( 407 construct<ProcPointerInit>(nullInit) || construct<ProcPointerInit>(name)) 408 409 // R1519 intrinsic-stmt -> INTRINSIC [::] intrinsic-procedure-name-list 410 TYPE_PARSER( 411 "INTRINSIC" >> maybe("::"_tok) >> construct<IntrinsicStmt>(listOfNames)) 412 413 // R1520 function-reference -> procedure-designator ( [actual-arg-spec-list] ) 414 TYPE_CONTEXT_PARSER("function reference"_en_US, 415 construct<FunctionReference>( 416 sourced(construct<Call>(Parser<ProcedureDesignator>{}, 417 parenthesized(optionalList(actualArgSpec))))) / 418 !"["_tok) 419 420 // R1521 call-stmt -> CALL procedure-designator [( [actual-arg-spec-list] )] 421 TYPE_PARSER(construct<CallStmt>( 422 sourced(construct<Call>("CALL" >> Parser<ProcedureDesignator>{}, 423 defaulted(parenthesized(optionalList(actualArgSpec))))))) 424 425 // R1522 procedure-designator -> 426 // procedure-name | proc-component-ref | data-ref % binding-name 427 TYPE_PARSER(construct<ProcedureDesignator>(Parser<ProcComponentRef>{}) || 428 construct<ProcedureDesignator>(name)) 429 430 // R1523 actual-arg-spec -> [keyword =] actual-arg 431 TYPE_PARSER(construct<ActualArgSpec>( 432 maybe(keyword / "=" / !"="_ch), Parser<ActualArg>{})) 433 434 // R1524 actual-arg -> 435 // expr | variable | procedure-name | proc-component-ref | 436 // alt-return-spec 437 // N.B. the "procedure-name" and "proc-component-ref" alternatives can't 438 // yet be distinguished from "variable", many instances of which can't be 439 // distinguished from "expr" anyway (to do so would misparse structure 440 // constructors and function calls as array elements). 441 // Semantics sorts it all out later. 442 TYPE_PARSER(construct<ActualArg>(expr) || 443 construct<ActualArg>(Parser<AltReturnSpec>{}) || 444 extension<LanguageFeature::PercentRefAndVal>(construct<ActualArg>( 445 construct<ActualArg::PercentRef>("%REF" >> parenthesized(variable)))) || 446 extension<LanguageFeature::PercentRefAndVal>(construct<ActualArg>( 447 construct<ActualArg::PercentVal>("%VAL" >> parenthesized(expr))))) 448 449 // R1525 alt-return-spec -> * label 450 TYPE_PARSER(construct<AltReturnSpec>(star >> label)) 451 452 // R1527 prefix-spec -> 453 // declaration-type-spec | ELEMENTAL | IMPURE | MODULE | 454 // NON_RECURSIVE | PURE | RECURSIVE 455 TYPE_PARSER(first(construct<PrefixSpec>(declarationTypeSpec), 456 construct<PrefixSpec>(construct<PrefixSpec::Elemental>("ELEMENTAL"_tok)), 457 construct<PrefixSpec>(construct<PrefixSpec::Impure>("IMPURE"_tok)), 458 construct<PrefixSpec>(construct<PrefixSpec::Module>("MODULE"_tok)), 459 construct<PrefixSpec>( 460 construct<PrefixSpec::Non_Recursive>("NON_RECURSIVE"_tok)), 461 construct<PrefixSpec>(construct<PrefixSpec::Pure>("PURE"_tok)), 462 construct<PrefixSpec>(construct<PrefixSpec::Recursive>("RECURSIVE"_tok)))) 463 464 // R1529 function-subprogram -> 465 // function-stmt [specification-part] [execution-part] 466 // [internal-subprogram-part] end-function-stmt 467 TYPE_CONTEXT_PARSER("FUNCTION subprogram"_en_US, 468 construct<FunctionSubprogram>(statement(functionStmt), specificationPart, 469 executionPart, maybe(internalSubprogramPart), 470 unterminatedStatement(endFunctionStmt))) 471 472 // R1530 function-stmt -> 473 // [prefix] FUNCTION function-name ( [dummy-arg-name-list] ) [suffix] 474 // R1526 prefix -> prefix-spec [prefix-spec]... 475 // R1531 dummy-arg-name -> name 476 TYPE_CONTEXT_PARSER("FUNCTION statement"_en_US, 477 construct<FunctionStmt>(many(prefixSpec), "FUNCTION" >> name, 478 parenthesized(optionalList(name)), maybe(suffix)) || 479 extension<LanguageFeature::OmitFunctionDummies>( 480 construct<FunctionStmt>( // PGI & Intel accept "FUNCTION F" 481 many(prefixSpec), "FUNCTION" >> name, 482 construct<std::list<Name>>(), 483 construct<std::optional<Suffix>>()))) 484 485 // R1532 suffix -> 486 // proc-language-binding-spec [RESULT ( result-name )] | 487 // RESULT ( result-name ) [proc-language-binding-spec] 488 TYPE_PARSER(construct<Suffix>( 489 languageBindingSpec, maybe("RESULT" >> parenthesized(name))) || 490 construct<Suffix>( 491 "RESULT" >> parenthesized(name), maybe(languageBindingSpec))) 492 493 // R1533 end-function-stmt -> END [FUNCTION [function-name]] 494 TYPE_PARSER(construct<EndFunctionStmt>(recovery( 495 "END FUNCTION" >> maybe(name) || bareEnd, progUnitEndStmtErrorRecovery))) 496 497 // R1534 subroutine-subprogram -> 498 // subroutine-stmt [specification-part] [execution-part] 499 // [internal-subprogram-part] end-subroutine-stmt 500 TYPE_CONTEXT_PARSER("SUBROUTINE subprogram"_en_US, 501 construct<SubroutineSubprogram>(statement(subroutineStmt), 502 specificationPart, executionPart, maybe(internalSubprogramPart), 503 unterminatedStatement(endSubroutineStmt))) 504 505 // R1535 subroutine-stmt -> 506 // [prefix] SUBROUTINE subroutine-name [( [dummy-arg-list] ) 507 // [proc-language-binding-spec]] 508 TYPE_PARSER( 509 construct<SubroutineStmt>(many(prefixSpec), "SUBROUTINE" >> name, 510 parenthesized(optionalList(dummyArg)), maybe(languageBindingSpec)) || 511 construct<SubroutineStmt>(many(prefixSpec), "SUBROUTINE" >> name, 512 defaulted(cut >> many(dummyArg)), 513 defaulted(cut >> maybe(languageBindingSpec)))) 514 515 // R1536 dummy-arg -> dummy-arg-name | * 516 TYPE_PARSER(construct<DummyArg>(name) || construct<DummyArg>(star)) 517 518 // R1537 end-subroutine-stmt -> END [SUBROUTINE [subroutine-name]] 519 TYPE_PARSER(construct<EndSubroutineStmt>(recovery( 520 "END SUBROUTINE" >> maybe(name) || bareEnd, progUnitEndStmtErrorRecovery))) 521 522 // R1538 separate-module-subprogram -> 523 // mp-subprogram-stmt [specification-part] [execution-part] 524 // [internal-subprogram-part] end-mp-subprogram-stmt 525 TYPE_CONTEXT_PARSER("separate module subprogram"_en_US, 526 construct<SeparateModuleSubprogram>(statement(Parser<MpSubprogramStmt>{}), 527 specificationPart, executionPart, maybe(internalSubprogramPart), 528 statement(Parser<EndMpSubprogramStmt>{}))) 529 530 // R1539 mp-subprogram-stmt -> MODULE PROCEDURE procedure-name 531 TYPE_CONTEXT_PARSER("MODULE PROCEDURE statement"_en_US, 532 construct<MpSubprogramStmt>("MODULE PROCEDURE"_sptok >> name)) 533 534 // R1540 end-mp-subprogram-stmt -> END [PROCEDURE [procedure-name]] 535 TYPE_CONTEXT_PARSER("END PROCEDURE statement"_en_US, 536 construct<EndMpSubprogramStmt>( 537 recovery("END PROCEDURE" >> maybe(name) || bareEnd, 538 progUnitEndStmtErrorRecovery))) 539 540 // R1541 entry-stmt -> ENTRY entry-name [( [dummy-arg-list] ) [suffix]] 541 TYPE_PARSER( 542 "ENTRY" >> (construct<EntryStmt>(name, 543 parenthesized(optionalList(dummyArg)), maybe(suffix)) || 544 construct<EntryStmt>(name, construct<std::list<DummyArg>>(), 545 construct<std::optional<Suffix>>()))) 546 547 // R1542 return-stmt -> RETURN [scalar-int-expr] 548 TYPE_CONTEXT_PARSER("RETURN statement"_en_US, 549 construct<ReturnStmt>("RETURN" >> maybe(scalarIntExpr))) 550 551 // R1543 contains-stmt -> CONTAINS 552 TYPE_PARSER(construct<ContainsStmt>("CONTAINS"_tok)) 553 554 // R1544 stmt-function-stmt -> 555 // function-name ( [dummy-arg-name-list] ) = scalar-expr 556 TYPE_CONTEXT_PARSER("statement function definition"_en_US, 557 construct<StmtFunctionStmt>( 558 name, parenthesized(optionalList(name)), "=" >> scalar(expr))) 559 } 560