1 //===-- lib/Semantics/resolve-names.cpp -----------------------------------===// 2 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 3 // See https://llvm.org/LICENSE.txt for license information. 4 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 5 // 6 //===----------------------------------------------------------------------===// 7 8 #include "resolve-names.h" 9 #include "assignment.h" 10 #include "mod-file.h" 11 #include "pointer-assignment.h" 12 #include "program-tree.h" 13 #include "resolve-directives.h" 14 #include "resolve-names-utils.h" 15 #include "rewrite-parse-tree.h" 16 #include "flang/Common/Fortran.h" 17 #include "flang/Common/default-kinds.h" 18 #include "flang/Common/indirection.h" 19 #include "flang/Common/restorer.h" 20 #include "flang/Common/visit.h" 21 #include "flang/Evaluate/characteristics.h" 22 #include "flang/Evaluate/check-expression.h" 23 #include "flang/Evaluate/common.h" 24 #include "flang/Evaluate/fold-designator.h" 25 #include "flang/Evaluate/fold.h" 26 #include "flang/Evaluate/intrinsics.h" 27 #include "flang/Evaluate/tools.h" 28 #include "flang/Evaluate/type.h" 29 #include "flang/Parser/parse-tree-visitor.h" 30 #include "flang/Parser/parse-tree.h" 31 #include "flang/Parser/tools.h" 32 #include "flang/Semantics/attr.h" 33 #include "flang/Semantics/expression.h" 34 #include "flang/Semantics/scope.h" 35 #include "flang/Semantics/semantics.h" 36 #include "flang/Semantics/symbol.h" 37 #include "flang/Semantics/tools.h" 38 #include "flang/Semantics/type.h" 39 #include "llvm/Support/raw_ostream.h" 40 #include <list> 41 #include <map> 42 #include <set> 43 #include <stack> 44 45 namespace Fortran::semantics { 46 47 using namespace parser::literals; 48 49 template <typename T> using Indirection = common::Indirection<T>; 50 using Message = parser::Message; 51 using Messages = parser::Messages; 52 using MessageFixedText = parser::MessageFixedText; 53 using MessageFormattedText = parser::MessageFormattedText; 54 55 class ResolveNamesVisitor; 56 class ScopeHandler; 57 58 // ImplicitRules maps initial character of identifier to the DeclTypeSpec 59 // representing the implicit type; std::nullopt if none. 60 // It also records the presence of IMPLICIT NONE statements. 61 // When inheritFromParent is set, defaults come from the parent rules. 62 class ImplicitRules { 63 public: 64 ImplicitRules(SemanticsContext &context, ImplicitRules *parent) 65 : parent_{parent}, context_{context} { 66 inheritFromParent_ = parent != nullptr; 67 } 68 bool isImplicitNoneType() const; 69 bool isImplicitNoneExternal() const; 70 void set_isImplicitNoneType(bool x) { isImplicitNoneType_ = x; } 71 void set_isImplicitNoneExternal(bool x) { isImplicitNoneExternal_ = x; } 72 void set_inheritFromParent(bool x) { inheritFromParent_ = x; } 73 // Get the implicit type for this name. May be null. 74 const DeclTypeSpec *GetType( 75 SourceName, bool respectImplicitNone = true) const; 76 // Record the implicit type for the range of characters [fromLetter, 77 // toLetter]. 78 void SetTypeMapping(const DeclTypeSpec &type, parser::Location fromLetter, 79 parser::Location toLetter); 80 81 private: 82 static char Incr(char ch); 83 84 ImplicitRules *parent_; 85 SemanticsContext &context_; 86 bool inheritFromParent_{false}; // look in parent if not specified here 87 bool isImplicitNoneType_{ 88 context_.IsEnabled(common::LanguageFeature::ImplicitNoneTypeAlways)}; 89 bool isImplicitNoneExternal_{false}; 90 // map_ contains the mapping between letters and types that were defined 91 // by the IMPLICIT statements of the related scope. It does not contain 92 // the default Fortran mappings nor the mapping defined in parents. 93 std::map<char, common::Reference<const DeclTypeSpec>> map_; 94 95 friend llvm::raw_ostream &operator<<( 96 llvm::raw_ostream &, const ImplicitRules &); 97 friend void ShowImplicitRule( 98 llvm::raw_ostream &, const ImplicitRules &, char); 99 }; 100 101 // scope -> implicit rules for that scope 102 using ImplicitRulesMap = std::map<const Scope *, ImplicitRules>; 103 104 // Track statement source locations and save messages. 105 class MessageHandler { 106 public: 107 MessageHandler() { DIE("MessageHandler: default-constructed"); } 108 explicit MessageHandler(SemanticsContext &c) : context_{&c} {} 109 Messages &messages() { return context_->messages(); }; 110 const std::optional<SourceName> &currStmtSource() { 111 return context_->location(); 112 } 113 void set_currStmtSource(const std::optional<SourceName> &source) { 114 context_->set_location(source); 115 } 116 117 // Emit a message associated with the current statement source. 118 Message &Say(MessageFixedText &&); 119 Message &Say(MessageFormattedText &&); 120 // Emit a message about a SourceName 121 Message &Say(const SourceName &, MessageFixedText &&); 122 // Emit a formatted message associated with a source location. 123 template <typename... A> 124 Message &Say(const SourceName &source, MessageFixedText &&msg, A &&...args) { 125 return context_->Say(source, std::move(msg), std::forward<A>(args)...); 126 } 127 128 private: 129 SemanticsContext *context_; 130 }; 131 132 // Inheritance graph for the parse tree visitation classes that follow: 133 // BaseVisitor 134 // + AttrsVisitor 135 // | + DeclTypeSpecVisitor 136 // | + ImplicitRulesVisitor 137 // | + ScopeHandler -----------+--+ 138 // | + ModuleVisitor ========|==+ 139 // | + InterfaceVisitor | | 140 // | +-+ SubprogramVisitor ==|==+ 141 // + ArraySpecVisitor | | 142 // + DeclarationVisitor <--------+ | 143 // + ConstructVisitor | 144 // + ResolveNamesVisitor <------+ 145 146 class BaseVisitor { 147 public: 148 BaseVisitor() { DIE("BaseVisitor: default-constructed"); } 149 BaseVisitor( 150 SemanticsContext &c, ResolveNamesVisitor &v, ImplicitRulesMap &rules) 151 : implicitRulesMap_{&rules}, this_{&v}, context_{&c}, messageHandler_{c} { 152 } 153 template <typename T> void Walk(const T &); 154 155 MessageHandler &messageHandler() { return messageHandler_; } 156 const std::optional<SourceName> &currStmtSource() { 157 return context_->location(); 158 } 159 SemanticsContext &context() const { return *context_; } 160 evaluate::FoldingContext &GetFoldingContext() const { 161 return context_->foldingContext(); 162 } 163 bool IsIntrinsic( 164 const SourceName &name, std::optional<Symbol::Flag> flag) const { 165 if (!flag) { 166 return context_->intrinsics().IsIntrinsic(name.ToString()); 167 } else if (flag == Symbol::Flag::Function) { 168 return context_->intrinsics().IsIntrinsicFunction(name.ToString()); 169 } else if (flag == Symbol::Flag::Subroutine) { 170 return context_->intrinsics().IsIntrinsicSubroutine(name.ToString()); 171 } else { 172 DIE("expected Subroutine or Function flag"); 173 } 174 } 175 176 // Make a placeholder symbol for a Name that otherwise wouldn't have one. 177 // It is not in any scope and always has MiscDetails. 178 void MakePlaceholder(const parser::Name &, MiscDetails::Kind); 179 180 template <typename T> common::IfNoLvalue<T, T> FoldExpr(T &&expr) { 181 return evaluate::Fold(GetFoldingContext(), std::move(expr)); 182 } 183 184 template <typename T> MaybeExpr EvaluateExpr(const T &expr) { 185 return FoldExpr(AnalyzeExpr(*context_, expr)); 186 } 187 188 template <typename T> 189 MaybeExpr EvaluateNonPointerInitializer( 190 const Symbol &symbol, const T &expr, parser::CharBlock source) { 191 if (!context().HasError(symbol)) { 192 if (auto maybeExpr{AnalyzeExpr(*context_, expr)}) { 193 auto restorer{GetFoldingContext().messages().SetLocation(source)}; 194 return evaluate::NonPointerInitializationExpr( 195 symbol, std::move(*maybeExpr), GetFoldingContext()); 196 } 197 } 198 return std::nullopt; 199 } 200 201 template <typename T> MaybeIntExpr EvaluateIntExpr(const T &expr) { 202 return semantics::EvaluateIntExpr(*context_, expr); 203 } 204 205 template <typename T> 206 MaybeSubscriptIntExpr EvaluateSubscriptIntExpr(const T &expr) { 207 if (MaybeIntExpr maybeIntExpr{EvaluateIntExpr(expr)}) { 208 return FoldExpr(evaluate::ConvertToType<evaluate::SubscriptInteger>( 209 std::move(*maybeIntExpr))); 210 } else { 211 return std::nullopt; 212 } 213 } 214 215 template <typename... A> Message &Say(A &&...args) { 216 return messageHandler_.Say(std::forward<A>(args)...); 217 } 218 template <typename... A> 219 Message &Say( 220 const parser::Name &name, MessageFixedText &&text, const A &...args) { 221 return messageHandler_.Say(name.source, std::move(text), args...); 222 } 223 224 protected: 225 ImplicitRulesMap *implicitRulesMap_{nullptr}; 226 227 private: 228 ResolveNamesVisitor *this_; 229 SemanticsContext *context_; 230 MessageHandler messageHandler_; 231 }; 232 233 // Provide Post methods to collect attributes into a member variable. 234 class AttrsVisitor : public virtual BaseVisitor { 235 public: 236 bool BeginAttrs(); // always returns true 237 Attrs GetAttrs(); 238 Attrs EndAttrs(); 239 bool SetPassNameOn(Symbol &); 240 void SetBindNameOn(Symbol &); 241 void Post(const parser::LanguageBindingSpec &); 242 bool Pre(const parser::IntentSpec &); 243 bool Pre(const parser::Pass &); 244 245 bool CheckAndSet(Attr); 246 247 // Simple case: encountering CLASSNAME causes ATTRNAME to be set. 248 #define HANDLE_ATTR_CLASS(CLASSNAME, ATTRNAME) \ 249 bool Pre(const parser::CLASSNAME &) { \ 250 CheckAndSet(Attr::ATTRNAME); \ 251 return false; \ 252 } 253 HANDLE_ATTR_CLASS(PrefixSpec::Elemental, ELEMENTAL) 254 HANDLE_ATTR_CLASS(PrefixSpec::Impure, IMPURE) 255 HANDLE_ATTR_CLASS(PrefixSpec::Module, MODULE) 256 HANDLE_ATTR_CLASS(PrefixSpec::Non_Recursive, NON_RECURSIVE) 257 HANDLE_ATTR_CLASS(PrefixSpec::Pure, PURE) 258 HANDLE_ATTR_CLASS(PrefixSpec::Recursive, RECURSIVE) 259 HANDLE_ATTR_CLASS(TypeAttrSpec::BindC, BIND_C) 260 HANDLE_ATTR_CLASS(BindAttr::Deferred, DEFERRED) 261 HANDLE_ATTR_CLASS(BindAttr::Non_Overridable, NON_OVERRIDABLE) 262 HANDLE_ATTR_CLASS(Abstract, ABSTRACT) 263 HANDLE_ATTR_CLASS(Allocatable, ALLOCATABLE) 264 HANDLE_ATTR_CLASS(Asynchronous, ASYNCHRONOUS) 265 HANDLE_ATTR_CLASS(Contiguous, CONTIGUOUS) 266 HANDLE_ATTR_CLASS(External, EXTERNAL) 267 HANDLE_ATTR_CLASS(Intrinsic, INTRINSIC) 268 HANDLE_ATTR_CLASS(NoPass, NOPASS) 269 HANDLE_ATTR_CLASS(Optional, OPTIONAL) 270 HANDLE_ATTR_CLASS(Parameter, PARAMETER) 271 HANDLE_ATTR_CLASS(Pointer, POINTER) 272 HANDLE_ATTR_CLASS(Protected, PROTECTED) 273 HANDLE_ATTR_CLASS(Save, SAVE) 274 HANDLE_ATTR_CLASS(Target, TARGET) 275 HANDLE_ATTR_CLASS(Value, VALUE) 276 HANDLE_ATTR_CLASS(Volatile, VOLATILE) 277 #undef HANDLE_ATTR_CLASS 278 279 protected: 280 std::optional<Attrs> attrs_; 281 282 Attr AccessSpecToAttr(const parser::AccessSpec &x) { 283 switch (x.v) { 284 case parser::AccessSpec::Kind::Public: 285 return Attr::PUBLIC; 286 case parser::AccessSpec::Kind::Private: 287 return Attr::PRIVATE; 288 } 289 llvm_unreachable("Switch covers all cases"); // suppress g++ warning 290 } 291 Attr IntentSpecToAttr(const parser::IntentSpec &x) { 292 switch (x.v) { 293 case parser::IntentSpec::Intent::In: 294 return Attr::INTENT_IN; 295 case parser::IntentSpec::Intent::Out: 296 return Attr::INTENT_OUT; 297 case parser::IntentSpec::Intent::InOut: 298 return Attr::INTENT_INOUT; 299 } 300 llvm_unreachable("Switch covers all cases"); // suppress g++ warning 301 } 302 303 private: 304 bool IsDuplicateAttr(Attr); 305 bool HaveAttrConflict(Attr, Attr, Attr); 306 bool IsConflictingAttr(Attr); 307 308 MaybeExpr bindName_; // from BIND(C, NAME="...") 309 std::optional<SourceName> passName_; // from PASS(...) 310 }; 311 312 // Find and create types from declaration-type-spec nodes. 313 class DeclTypeSpecVisitor : public AttrsVisitor { 314 public: 315 using AttrsVisitor::Post; 316 using AttrsVisitor::Pre; 317 void Post(const parser::IntrinsicTypeSpec::DoublePrecision &); 318 void Post(const parser::IntrinsicTypeSpec::DoubleComplex &); 319 void Post(const parser::DeclarationTypeSpec::ClassStar &); 320 void Post(const parser::DeclarationTypeSpec::TypeStar &); 321 bool Pre(const parser::TypeGuardStmt &); 322 void Post(const parser::TypeGuardStmt &); 323 void Post(const parser::TypeSpec &); 324 325 // Walk the parse tree of a type spec and return the DeclTypeSpec for it. 326 template <typename T> 327 const DeclTypeSpec *ProcessTypeSpec(const T &x, bool allowForward = false) { 328 auto restorer{common::ScopedSet(state_, State{})}; 329 set_allowForwardReferenceToDerivedType(allowForward); 330 BeginDeclTypeSpec(); 331 Walk(x); 332 const auto *type{GetDeclTypeSpec()}; 333 EndDeclTypeSpec(); 334 return type; 335 } 336 337 protected: 338 struct State { 339 bool expectDeclTypeSpec{false}; // should see decl-type-spec only when true 340 const DeclTypeSpec *declTypeSpec{nullptr}; 341 struct { 342 DerivedTypeSpec *type{nullptr}; 343 DeclTypeSpec::Category category{DeclTypeSpec::TypeDerived}; 344 } derived; 345 bool allowForwardReferenceToDerivedType{false}; 346 }; 347 348 bool allowForwardReferenceToDerivedType() const { 349 return state_.allowForwardReferenceToDerivedType; 350 } 351 void set_allowForwardReferenceToDerivedType(bool yes) { 352 state_.allowForwardReferenceToDerivedType = yes; 353 } 354 355 const DeclTypeSpec *GetDeclTypeSpec(); 356 void BeginDeclTypeSpec(); 357 void EndDeclTypeSpec(); 358 void SetDeclTypeSpec(const DeclTypeSpec &); 359 void SetDeclTypeSpecCategory(DeclTypeSpec::Category); 360 DeclTypeSpec::Category GetDeclTypeSpecCategory() const { 361 return state_.derived.category; 362 } 363 KindExpr GetKindParamExpr( 364 TypeCategory, const std::optional<parser::KindSelector> &); 365 void CheckForAbstractType(const Symbol &typeSymbol); 366 367 private: 368 State state_; 369 370 void MakeNumericType(TypeCategory, int kind); 371 }; 372 373 // Visit ImplicitStmt and related parse tree nodes and updates implicit rules. 374 class ImplicitRulesVisitor : public DeclTypeSpecVisitor { 375 public: 376 using DeclTypeSpecVisitor::Post; 377 using DeclTypeSpecVisitor::Pre; 378 using ImplicitNoneNameSpec = parser::ImplicitStmt::ImplicitNoneNameSpec; 379 380 void Post(const parser::ParameterStmt &); 381 bool Pre(const parser::ImplicitStmt &); 382 bool Pre(const parser::LetterSpec &); 383 bool Pre(const parser::ImplicitSpec &); 384 void Post(const parser::ImplicitSpec &); 385 386 const DeclTypeSpec *GetType( 387 SourceName name, bool respectImplicitNoneType = true) { 388 return implicitRules_->GetType(name, respectImplicitNoneType); 389 } 390 bool isImplicitNoneType() const { 391 return implicitRules_->isImplicitNoneType(); 392 } 393 bool isImplicitNoneType(const Scope &scope) const { 394 return implicitRulesMap_->at(&scope).isImplicitNoneType(); 395 } 396 bool isImplicitNoneExternal() const { 397 return implicitRules_->isImplicitNoneExternal(); 398 } 399 void set_inheritFromParent(bool x) { 400 implicitRules_->set_inheritFromParent(x); 401 } 402 403 protected: 404 void BeginScope(const Scope &); 405 void SetScope(const Scope &); 406 407 private: 408 // implicit rules in effect for current scope 409 ImplicitRules *implicitRules_{nullptr}; 410 std::optional<SourceName> prevImplicit_; 411 std::optional<SourceName> prevImplicitNone_; 412 std::optional<SourceName> prevImplicitNoneType_; 413 std::optional<SourceName> prevParameterStmt_; 414 415 bool HandleImplicitNone(const std::list<ImplicitNoneNameSpec> &nameSpecs); 416 }; 417 418 // Track array specifications. They can occur in AttrSpec, EntityDecl, 419 // ObjectDecl, DimensionStmt, CommonBlockObject, or BasedPointerStmt. 420 // 1. INTEGER, DIMENSION(10) :: x 421 // 2. INTEGER :: x(10) 422 // 3. ALLOCATABLE :: x(:) 423 // 4. DIMENSION :: x(10) 424 // 5. COMMON x(10) 425 // 6. BasedPointerStmt 426 class ArraySpecVisitor : public virtual BaseVisitor { 427 public: 428 void Post(const parser::ArraySpec &); 429 void Post(const parser::ComponentArraySpec &); 430 void Post(const parser::CoarraySpec &); 431 void Post(const parser::AttrSpec &) { PostAttrSpec(); } 432 void Post(const parser::ComponentAttrSpec &) { PostAttrSpec(); } 433 434 protected: 435 const ArraySpec &arraySpec(); 436 void set_arraySpec(const ArraySpec arraySpec) { arraySpec_ = arraySpec; } 437 const ArraySpec &coarraySpec(); 438 void BeginArraySpec(); 439 void EndArraySpec(); 440 void ClearArraySpec() { arraySpec_.clear(); } 441 void ClearCoarraySpec() { coarraySpec_.clear(); } 442 443 private: 444 // arraySpec_/coarraySpec_ are populated from any ArraySpec/CoarraySpec 445 ArraySpec arraySpec_; 446 ArraySpec coarraySpec_; 447 // When an ArraySpec is under an AttrSpec or ComponentAttrSpec, it is moved 448 // into attrArraySpec_ 449 ArraySpec attrArraySpec_; 450 ArraySpec attrCoarraySpec_; 451 452 void PostAttrSpec(); 453 }; 454 455 // Manages a stack of function result information. We defer the processing 456 // of a type specification that appears in the prefix of a FUNCTION statement 457 // until the function result variable appears in the specification part 458 // or the end of the specification part. This allows for forward references 459 // in the type specification to resolve to local names. 460 class FuncResultStack { 461 public: 462 explicit FuncResultStack(ScopeHandler &scopeHandler) 463 : scopeHandler_{scopeHandler} {} 464 ~FuncResultStack(); 465 466 struct FuncInfo { 467 // Parse tree of the type specification in the FUNCTION prefix 468 const parser::DeclarationTypeSpec *parsedType{nullptr}; 469 // Name of the function RESULT in the FUNCTION suffix, if any 470 const parser::Name *resultName{nullptr}; 471 // Result symbol 472 Symbol *resultSymbol{nullptr}; 473 std::optional<SourceName> source; 474 bool inFunctionStmt{false}; // true between Pre/Post of FunctionStmt 475 }; 476 477 // Completes the definition of the top function's result. 478 void CompleteFunctionResultType(); 479 // Completes the definition of a symbol if it is the top function's result. 480 void CompleteTypeIfFunctionResult(Symbol &); 481 482 FuncInfo *Top() { return stack_.empty() ? nullptr : &stack_.back(); } 483 FuncInfo &Push() { return stack_.emplace_back(); } 484 void Pop() { stack_.pop_back(); } 485 486 private: 487 ScopeHandler &scopeHandler_; 488 std::vector<FuncInfo> stack_; 489 }; 490 491 // Manage a stack of Scopes 492 class ScopeHandler : public ImplicitRulesVisitor { 493 public: 494 using ImplicitRulesVisitor::Post; 495 using ImplicitRulesVisitor::Pre; 496 497 Scope &currScope() { return DEREF(currScope_); } 498 // The enclosing host procedure if current scope is in an internal procedure 499 Scope *GetHostProcedure(); 500 // The innermost enclosing program unit scope, ignoring BLOCK and other 501 // construct scopes. 502 Scope &InclusiveScope(); 503 // The enclosing scope, skipping derived types. 504 Scope &NonDerivedTypeScope(); 505 506 // Create a new scope and push it on the scope stack. 507 void PushScope(Scope::Kind kind, Symbol *symbol); 508 void PushScope(Scope &scope); 509 void PopScope(); 510 void SetScope(Scope &); 511 512 template <typename T> bool Pre(const parser::Statement<T> &x) { 513 messageHandler().set_currStmtSource(x.source); 514 currScope_->AddSourceRange(x.source); 515 return true; 516 } 517 template <typename T> void Post(const parser::Statement<T> &) { 518 messageHandler().set_currStmtSource(std::nullopt); 519 } 520 521 // Special messages: already declared; referencing symbol's declaration; 522 // about a type; two names & locations 523 void SayAlreadyDeclared(const parser::Name &, Symbol &); 524 void SayAlreadyDeclared(const SourceName &, Symbol &); 525 void SayAlreadyDeclared(const SourceName &, const SourceName &); 526 void SayWithReason( 527 const parser::Name &, Symbol &, MessageFixedText &&, Message &&); 528 void SayWithDecl(const parser::Name &, Symbol &, MessageFixedText &&); 529 void SayLocalMustBeVariable(const parser::Name &, Symbol &); 530 void SayDerivedType(const SourceName &, MessageFixedText &&, const Scope &); 531 void Say2(const SourceName &, MessageFixedText &&, const SourceName &, 532 MessageFixedText &&); 533 void Say2( 534 const SourceName &, MessageFixedText &&, Symbol &, MessageFixedText &&); 535 void Say2( 536 const parser::Name &, MessageFixedText &&, Symbol &, MessageFixedText &&); 537 538 // Search for symbol by name in current, parent derived type, and 539 // containing scopes 540 Symbol *FindSymbol(const parser::Name &); 541 Symbol *FindSymbol(const Scope &, const parser::Name &); 542 // Search for name only in scope, not in enclosing scopes. 543 Symbol *FindInScope(const Scope &, const parser::Name &); 544 Symbol *FindInScope(const Scope &, const SourceName &); 545 template <typename T> Symbol *FindInScope(const T &name) { 546 return FindInScope(currScope(), name); 547 } 548 // Search for name in a derived type scope and its parents. 549 Symbol *FindInTypeOrParents(const Scope &, const parser::Name &); 550 Symbol *FindInTypeOrParents(const parser::Name &); 551 void EraseSymbol(const parser::Name &); 552 void EraseSymbol(const Symbol &symbol) { currScope().erase(symbol.name()); } 553 // Make a new symbol with the name and attrs of an existing one 554 Symbol &CopySymbol(const SourceName &, const Symbol &); 555 556 // Make symbols in the current or named scope 557 Symbol &MakeSymbol(Scope &, const SourceName &, Attrs); 558 Symbol &MakeSymbol(const SourceName &, Attrs = Attrs{}); 559 Symbol &MakeSymbol(const parser::Name &, Attrs = Attrs{}); 560 Symbol &MakeHostAssocSymbol(const parser::Name &, const Symbol &); 561 562 template <typename D> 563 common::IfNoLvalue<Symbol &, D> MakeSymbol( 564 const parser::Name &name, D &&details) { 565 return MakeSymbol(name, Attrs{}, std::move(details)); 566 } 567 568 template <typename D> 569 common::IfNoLvalue<Symbol &, D> MakeSymbol( 570 const parser::Name &name, const Attrs &attrs, D &&details) { 571 return Resolve(name, MakeSymbol(name.source, attrs, std::move(details))); 572 } 573 574 template <typename D> 575 common::IfNoLvalue<Symbol &, D> MakeSymbol( 576 const SourceName &name, const Attrs &attrs, D &&details) { 577 // Note: don't use FindSymbol here. If this is a derived type scope, 578 // we want to detect whether the name is already declared as a component. 579 auto *symbol{FindInScope(name)}; 580 if (!symbol) { 581 symbol = &MakeSymbol(name, attrs); 582 symbol->set_details(std::move(details)); 583 return *symbol; 584 } 585 if constexpr (std::is_same_v<DerivedTypeDetails, D>) { 586 if (auto *d{symbol->detailsIf<GenericDetails>()}) { 587 if (!d->specific()) { 588 // derived type with same name as a generic 589 auto *derivedType{d->derivedType()}; 590 if (!derivedType) { 591 derivedType = 592 &currScope().MakeSymbol(name, attrs, std::move(details)); 593 d->set_derivedType(*derivedType); 594 } else { 595 SayAlreadyDeclared(name, *derivedType); 596 } 597 return *derivedType; 598 } 599 } 600 } 601 if (symbol->CanReplaceDetails(details)) { 602 // update the existing symbol 603 symbol->attrs() |= attrs; 604 if constexpr (std::is_same_v<SubprogramDetails, D>) { 605 // Dummy argument defined by explicit interface 606 details.set_isDummy(IsDummy(*symbol)); 607 } 608 symbol->set_details(std::move(details)); 609 return *symbol; 610 } else if constexpr (std::is_same_v<UnknownDetails, D>) { 611 symbol->attrs() |= attrs; 612 return *symbol; 613 } else { 614 if (!CheckPossibleBadForwardRef(*symbol)) { 615 if (name.empty() && symbol->name().empty()) { 616 // report the error elsewhere 617 return *symbol; 618 } 619 SayAlreadyDeclared(name, *symbol); 620 } 621 // replace the old symbol with a new one with correct details 622 EraseSymbol(*symbol); 623 auto &result{MakeSymbol(name, attrs, std::move(details))}; 624 context().SetError(result); 625 return result; 626 } 627 } 628 629 void MakeExternal(Symbol &); 630 631 protected: 632 FuncResultStack &funcResultStack() { return funcResultStack_; } 633 634 // Apply the implicit type rules to this symbol. 635 void ApplyImplicitRules(Symbol &, bool allowForwardReference = false); 636 bool ImplicitlyTypeForwardRef(Symbol &); 637 void AcquireIntrinsicProcedureFlags(Symbol &); 638 const DeclTypeSpec *GetImplicitType( 639 Symbol &, bool respectImplicitNoneType = true); 640 bool ConvertToObjectEntity(Symbol &); 641 bool ConvertToProcEntity(Symbol &); 642 643 const DeclTypeSpec &MakeNumericType( 644 TypeCategory, const std::optional<parser::KindSelector> &); 645 const DeclTypeSpec &MakeLogicalType( 646 const std::optional<parser::KindSelector> &); 647 void NotePossibleBadForwardRef(const parser::Name &); 648 std::optional<SourceName> HadForwardRef(const Symbol &) const; 649 bool CheckPossibleBadForwardRef(const Symbol &); 650 651 bool inExecutionPart_{false}; 652 bool inSpecificationPart_{false}; 653 bool inEquivalenceStmt_{false}; 654 655 // Some information is collected from a specification part for deferred 656 // processing in DeclarationPartVisitor functions (e.g., CheckSaveStmts()) 657 // that are called by ResolveNamesVisitor::FinishSpecificationPart(). Since 658 // specification parts can nest (e.g., INTERFACE bodies), the collected 659 // information that is not contained in the scope needs to be packaged 660 // and restorable. 661 struct SpecificationPartState { 662 std::set<SourceName> forwardRefs; 663 // Collect equivalence sets and process at end of specification part 664 std::vector<const std::list<parser::EquivalenceObject> *> equivalenceSets; 665 // Names of all common block objects in the scope 666 std::set<SourceName> commonBlockObjects; 667 // Info about about SAVE statements and attributes in current scope 668 struct { 669 std::optional<SourceName> saveAll; // "SAVE" without entity list 670 std::set<SourceName> entities; // names of entities with save attr 671 std::set<SourceName> commons; // names of common blocks with save attr 672 } saveInfo; 673 } specPartState_; 674 675 // Some declaration processing can and should be deferred to 676 // ResolveExecutionParts() to avoid prematurely creating implicitly-typed 677 // local symbols that should be host associations. 678 struct DeferredDeclarationState { 679 // The content of each namelist group 680 std::list<const parser::NamelistStmt::Group *> namelistGroups; 681 }; 682 DeferredDeclarationState *GetDeferredDeclarationState(bool add = false) { 683 if (!add && deferred_.find(&currScope()) == deferred_.end()) { 684 return nullptr; 685 } else { 686 return &deferred_.emplace(&currScope(), DeferredDeclarationState{}) 687 .first->second; 688 } 689 } 690 691 private: 692 Scope *currScope_{nullptr}; 693 FuncResultStack funcResultStack_{*this}; 694 std::map<Scope *, DeferredDeclarationState> deferred_; 695 }; 696 697 class ModuleVisitor : public virtual ScopeHandler { 698 public: 699 bool Pre(const parser::AccessStmt &); 700 bool Pre(const parser::Only &); 701 bool Pre(const parser::Rename::Names &); 702 bool Pre(const parser::Rename::Operators &); 703 bool Pre(const parser::UseStmt &); 704 void Post(const parser::UseStmt &); 705 706 void BeginModule(const parser::Name &, bool isSubmodule); 707 bool BeginSubmodule(const parser::Name &, const parser::ParentIdentifier &); 708 void ApplyDefaultAccess(); 709 Symbol &AddGenericUse(GenericDetails &, const SourceName &, const Symbol &); 710 void AddAndCheckExplicitIntrinsicUse(SourceName, bool isIntrinsic); 711 void ClearUseRenames() { useRenames_.clear(); } 712 void ClearUseOnly() { useOnly_.clear(); } 713 void ClearExplicitIntrinsicUses() { 714 explicitIntrinsicUses_.clear(); 715 explicitNonIntrinsicUses_.clear(); 716 } 717 718 private: 719 // The default access spec for this module. 720 Attr defaultAccess_{Attr::PUBLIC}; 721 // The location of the last AccessStmt without access-ids, if any. 722 std::optional<SourceName> prevAccessStmt_; 723 // The scope of the module during a UseStmt 724 Scope *useModuleScope_{nullptr}; 725 // Names that have appeared in a rename clause of a USE statement 726 std::set<std::pair<SourceName, Scope *>> useRenames_; 727 // Names that have appeared in an ONLY clause of a USE statement 728 std::set<std::pair<SourceName, Scope *>> useOnly_; 729 // Module names that have appeared in USE statements with explicit 730 // INTRINSIC or NON_INTRINSIC keywords 731 std::set<SourceName> explicitIntrinsicUses_; 732 std::set<SourceName> explicitNonIntrinsicUses_; 733 734 Symbol &SetAccess(const SourceName &, Attr attr, Symbol * = nullptr); 735 // A rename in a USE statement: local => use 736 struct SymbolRename { 737 Symbol *local{nullptr}; 738 Symbol *use{nullptr}; 739 }; 740 // Record a use from useModuleScope_ of use Name/Symbol as local Name/Symbol 741 SymbolRename AddUse(const SourceName &localName, const SourceName &useName); 742 SymbolRename AddUse(const SourceName &, const SourceName &, Symbol *); 743 void DoAddUse( 744 SourceName, SourceName, Symbol &localSymbol, const Symbol &useSymbol); 745 void AddUse(const GenericSpecInfo &); 746 // If appropriate, erase a previously USE-associated symbol 747 void EraseRenamedSymbol(const Symbol &); 748 // Record a name appearing in a USE rename clause 749 void AddUseRename(const SourceName &name) { 750 useRenames_.emplace(std::make_pair(name, useModuleScope_)); 751 } 752 bool IsUseRenamed(const SourceName &name) const { 753 return useRenames_.find({name, useModuleScope_}) != useRenames_.end(); 754 } 755 // Record a name appearing in a USE ONLY clause 756 void AddUseOnly(const SourceName &name) { 757 useOnly_.emplace(std::make_pair(name, useModuleScope_)); 758 } 759 bool IsUseOnly(const SourceName &name) const { 760 return useOnly_.find({name, useModuleScope_}) != useOnly_.end(); 761 } 762 Scope *FindModule(const parser::Name &, std::optional<bool> isIntrinsic, 763 Scope *ancestor = nullptr); 764 }; 765 766 class InterfaceVisitor : public virtual ScopeHandler { 767 public: 768 bool Pre(const parser::InterfaceStmt &); 769 void Post(const parser::InterfaceStmt &); 770 void Post(const parser::EndInterfaceStmt &); 771 bool Pre(const parser::GenericSpec &); 772 bool Pre(const parser::ProcedureStmt &); 773 bool Pre(const parser::GenericStmt &); 774 void Post(const parser::GenericStmt &); 775 776 bool inInterfaceBlock() const; 777 bool isGeneric() const; 778 bool isAbstract() const; 779 780 protected: 781 Symbol &GetGenericSymbol() { return DEREF(genericInfo_.top().symbol); } 782 // Add to generic the symbol for the subprogram with the same name 783 void CheckGenericProcedures(Symbol &); 784 785 private: 786 // A new GenericInfo is pushed for each interface block and generic stmt 787 struct GenericInfo { 788 GenericInfo(bool isInterface, bool isAbstract = false) 789 : isInterface{isInterface}, isAbstract{isAbstract} {} 790 bool isInterface; // in interface block 791 bool isAbstract; // in abstract interface block 792 Symbol *symbol{nullptr}; // the generic symbol being defined 793 }; 794 std::stack<GenericInfo> genericInfo_; 795 const GenericInfo &GetGenericInfo() const { return genericInfo_.top(); } 796 void SetGenericSymbol(Symbol &symbol) { genericInfo_.top().symbol = &symbol; } 797 798 using ProcedureKind = parser::ProcedureStmt::Kind; 799 // mapping of generic to its specific proc names and kinds 800 std::multimap<Symbol *, std::pair<const parser::Name *, ProcedureKind>> 801 specificProcs_; 802 803 void AddSpecificProcs(const std::list<parser::Name> &, ProcedureKind); 804 void ResolveSpecificsInGeneric(Symbol &generic); 805 }; 806 807 class SubprogramVisitor : public virtual ScopeHandler, public InterfaceVisitor { 808 public: 809 bool HandleStmtFunction(const parser::StmtFunctionStmt &); 810 bool Pre(const parser::SubroutineStmt &); 811 void Post(const parser::SubroutineStmt &); 812 bool Pre(const parser::FunctionStmt &); 813 void Post(const parser::FunctionStmt &); 814 bool Pre(const parser::EntryStmt &); 815 void Post(const parser::EntryStmt &); 816 bool Pre(const parser::InterfaceBody::Subroutine &); 817 void Post(const parser::InterfaceBody::Subroutine &); 818 bool Pre(const parser::InterfaceBody::Function &); 819 void Post(const parser::InterfaceBody::Function &); 820 bool Pre(const parser::Suffix &); 821 bool Pre(const parser::PrefixSpec &); 822 823 bool BeginSubprogram(const parser::Name &, Symbol::Flag, 824 bool hasModulePrefix = false, 825 const parser::LanguageBindingSpec * = nullptr); 826 bool BeginMpSubprogram(const parser::Name &); 827 void PushBlockDataScope(const parser::Name &); 828 void EndSubprogram(); 829 830 protected: 831 // Set when we see a stmt function that is really an array element assignment 832 bool badStmtFuncFound_{false}; 833 834 private: 835 // Edits an existing symbol created for earlier calls to a subprogram or ENTRY 836 // so that it can be replaced by a later definition. 837 bool HandlePreviousCalls(const parser::Name &, Symbol &, Symbol::Flag); 838 void CheckExtantProc(const parser::Name &, Symbol::Flag); 839 // Create a subprogram symbol in the current scope and push a new scope. 840 Symbol &PushSubprogramScope(const parser::Name &, Symbol::Flag, 841 const parser::LanguageBindingSpec * = nullptr); 842 Symbol *GetSpecificFromGeneric(const parser::Name &); 843 SubprogramDetails &PostSubprogramStmt(const parser::Name &); 844 void PostEntryStmt(const parser::EntryStmt &stmt); 845 }; 846 847 class DeclarationVisitor : public ArraySpecVisitor, 848 public virtual ScopeHandler { 849 public: 850 using ArraySpecVisitor::Post; 851 using ScopeHandler::Post; 852 using ScopeHandler::Pre; 853 854 bool Pre(const parser::Initialization &); 855 void Post(const parser::EntityDecl &); 856 void Post(const parser::ObjectDecl &); 857 void Post(const parser::PointerDecl &); 858 bool Pre(const parser::BindStmt &) { return BeginAttrs(); } 859 void Post(const parser::BindStmt &) { EndAttrs(); } 860 bool Pre(const parser::BindEntity &); 861 bool Pre(const parser::OldParameterStmt &); 862 bool Pre(const parser::NamedConstantDef &); 863 bool Pre(const parser::NamedConstant &); 864 void Post(const parser::EnumDef &); 865 bool Pre(const parser::Enumerator &); 866 bool Pre(const parser::AccessSpec &); 867 bool Pre(const parser::AsynchronousStmt &); 868 bool Pre(const parser::ContiguousStmt &); 869 bool Pre(const parser::ExternalStmt &); 870 bool Pre(const parser::IntentStmt &); 871 bool Pre(const parser::IntrinsicStmt &); 872 bool Pre(const parser::OptionalStmt &); 873 bool Pre(const parser::ProtectedStmt &); 874 bool Pre(const parser::ValueStmt &); 875 bool Pre(const parser::VolatileStmt &); 876 bool Pre(const parser::AllocatableStmt &) { 877 objectDeclAttr_ = Attr::ALLOCATABLE; 878 return true; 879 } 880 void Post(const parser::AllocatableStmt &) { objectDeclAttr_ = std::nullopt; } 881 bool Pre(const parser::TargetStmt &) { 882 objectDeclAttr_ = Attr::TARGET; 883 return true; 884 } 885 void Post(const parser::TargetStmt &) { objectDeclAttr_ = std::nullopt; } 886 void Post(const parser::DimensionStmt::Declaration &); 887 void Post(const parser::CodimensionDecl &); 888 bool Pre(const parser::TypeDeclarationStmt &) { return BeginDecl(); } 889 void Post(const parser::TypeDeclarationStmt &); 890 void Post(const parser::IntegerTypeSpec &); 891 void Post(const parser::IntrinsicTypeSpec::Real &); 892 void Post(const parser::IntrinsicTypeSpec::Complex &); 893 void Post(const parser::IntrinsicTypeSpec::Logical &); 894 void Post(const parser::IntrinsicTypeSpec::Character &); 895 void Post(const parser::CharSelector::LengthAndKind &); 896 void Post(const parser::CharLength &); 897 void Post(const parser::LengthSelector &); 898 bool Pre(const parser::KindParam &); 899 bool Pre(const parser::DeclarationTypeSpec::Type &); 900 void Post(const parser::DeclarationTypeSpec::Type &); 901 bool Pre(const parser::DeclarationTypeSpec::Class &); 902 void Post(const parser::DeclarationTypeSpec::Class &); 903 void Post(const parser::DeclarationTypeSpec::Record &); 904 void Post(const parser::DerivedTypeSpec &); 905 bool Pre(const parser::DerivedTypeDef &); 906 bool Pre(const parser::DerivedTypeStmt &); 907 void Post(const parser::DerivedTypeStmt &); 908 bool Pre(const parser::TypeParamDefStmt &) { return BeginDecl(); } 909 void Post(const parser::TypeParamDefStmt &); 910 bool Pre(const parser::TypeAttrSpec::Extends &); 911 bool Pre(const parser::PrivateStmt &); 912 bool Pre(const parser::SequenceStmt &); 913 bool Pre(const parser::ComponentDefStmt &) { return BeginDecl(); } 914 void Post(const parser::ComponentDefStmt &) { EndDecl(); } 915 void Post(const parser::ComponentDecl &); 916 void Post(const parser::FillDecl &); 917 bool Pre(const parser::ProcedureDeclarationStmt &); 918 void Post(const parser::ProcedureDeclarationStmt &); 919 bool Pre(const parser::DataComponentDefStmt &); // returns false 920 bool Pre(const parser::ProcComponentDefStmt &); 921 void Post(const parser::ProcComponentDefStmt &); 922 bool Pre(const parser::ProcPointerInit &); 923 void Post(const parser::ProcInterface &); 924 void Post(const parser::ProcDecl &); 925 bool Pre(const parser::TypeBoundProcedurePart &); 926 void Post(const parser::TypeBoundProcedurePart &); 927 void Post(const parser::ContainsStmt &); 928 bool Pre(const parser::TypeBoundProcBinding &) { return BeginAttrs(); } 929 void Post(const parser::TypeBoundProcBinding &) { EndAttrs(); } 930 void Post(const parser::TypeBoundProcedureStmt::WithoutInterface &); 931 void Post(const parser::TypeBoundProcedureStmt::WithInterface &); 932 void Post(const parser::FinalProcedureStmt &); 933 bool Pre(const parser::TypeBoundGenericStmt &); 934 bool Pre(const parser::StructureDef &); // returns false 935 bool Pre(const parser::Union::UnionStmt &); 936 bool Pre(const parser::StructureField &); 937 void Post(const parser::StructureField &); 938 bool Pre(const parser::AllocateStmt &); 939 void Post(const parser::AllocateStmt &); 940 bool Pre(const parser::StructureConstructor &); 941 bool Pre(const parser::NamelistStmt::Group &); 942 bool Pre(const parser::IoControlSpec &); 943 bool Pre(const parser::CommonStmt::Block &); 944 bool Pre(const parser::CommonBlockObject &); 945 void Post(const parser::CommonBlockObject &); 946 bool Pre(const parser::EquivalenceStmt &); 947 bool Pre(const parser::SaveStmt &); 948 bool Pre(const parser::BasedPointerStmt &); 949 950 void PointerInitialization( 951 const parser::Name &, const parser::InitialDataTarget &); 952 void PointerInitialization( 953 const parser::Name &, const parser::ProcPointerInit &); 954 void NonPointerInitialization( 955 const parser::Name &, const parser::ConstantExpr &); 956 void CheckExplicitInterface(const parser::Name &); 957 void CheckBindings(const parser::TypeBoundProcedureStmt::WithoutInterface &); 958 959 const parser::Name *ResolveDesignator(const parser::Designator &); 960 961 protected: 962 bool BeginDecl(); 963 void EndDecl(); 964 Symbol &DeclareObjectEntity(const parser::Name &, Attrs = Attrs{}); 965 // Make sure that there's an entity in an enclosing scope called Name 966 Symbol &FindOrDeclareEnclosingEntity(const parser::Name &); 967 // Declare a LOCAL/LOCAL_INIT entity. If there isn't a type specified 968 // it comes from the entity in the containing scope, or implicit rules. 969 // Return pointer to the new symbol, or nullptr on error. 970 Symbol *DeclareLocalEntity(const parser::Name &); 971 // Declare a statement entity (i.e., an implied DO loop index for 972 // a DATA statement or an array constructor). If there isn't an explict 973 // type specified, implicit rules apply. Return pointer to the new symbol, 974 // or nullptr on error. 975 Symbol *DeclareStatementEntity(const parser::DoVariable &, 976 const std::optional<parser::IntegerTypeSpec> &); 977 Symbol &MakeCommonBlockSymbol(const parser::Name &); 978 Symbol &MakeCommonBlockSymbol(const std::optional<parser::Name> &); 979 bool CheckUseError(const parser::Name &); 980 void CheckAccessibility(const SourceName &, bool, Symbol &); 981 void CheckCommonBlocks(); 982 void CheckSaveStmts(); 983 void CheckEquivalenceSets(); 984 bool CheckNotInBlock(const char *); 985 bool NameIsKnownOrIntrinsic(const parser::Name &); 986 void FinishNamelists(); 987 988 // Each of these returns a pointer to a resolved Name (i.e. with symbol) 989 // or nullptr in case of error. 990 const parser::Name *ResolveStructureComponent( 991 const parser::StructureComponent &); 992 const parser::Name *ResolveDataRef(const parser::DataRef &); 993 const parser::Name *ResolveName(const parser::Name &); 994 bool PassesSharedLocalityChecks(const parser::Name &name, Symbol &symbol); 995 Symbol *NoteInterfaceName(const parser::Name &); 996 bool IsUplevelReference(const Symbol &); 997 998 std::optional<SourceName> BeginCheckOnIndexUseInOwnBounds( 999 const parser::DoVariable &name) { 1000 std::optional<SourceName> result{checkIndexUseInOwnBounds_}; 1001 checkIndexUseInOwnBounds_ = name.thing.thing.source; 1002 return result; 1003 } 1004 void EndCheckOnIndexUseInOwnBounds(const std::optional<SourceName> &restore) { 1005 checkIndexUseInOwnBounds_ = restore; 1006 } 1007 1008 private: 1009 // The attribute corresponding to the statement containing an ObjectDecl 1010 std::optional<Attr> objectDeclAttr_; 1011 // Info about current character type while walking DeclTypeSpec. 1012 // Also captures any "*length" specifier on an individual declaration. 1013 struct { 1014 std::optional<ParamValue> length; 1015 std::optional<KindExpr> kind; 1016 } charInfo_; 1017 // Info about current derived type or STRUCTURE while walking 1018 // DerivedTypeDef / StructureDef 1019 struct { 1020 const parser::Name *extends{nullptr}; // EXTENDS(name) 1021 bool privateComps{false}; // components are private by default 1022 bool privateBindings{false}; // bindings are private by default 1023 bool sawContains{false}; // currently processing bindings 1024 bool sequence{false}; // is a sequence type 1025 const Symbol *type{nullptr}; // derived type being defined 1026 bool isStructure{false}; // is a DEC STRUCTURE 1027 } derivedTypeInfo_; 1028 // In a ProcedureDeclarationStmt or ProcComponentDefStmt, this is 1029 // the interface name, if any. 1030 const parser::Name *interfaceName_{nullptr}; 1031 // Map type-bound generic to binding names of its specific bindings 1032 std::multimap<Symbol *, const parser::Name *> genericBindings_; 1033 // Info about current ENUM 1034 struct EnumeratorState { 1035 // Enum value must hold inside a C_INT (7.6.2). 1036 std::optional<int> value{0}; 1037 } enumerationState_; 1038 // Set for OldParameterStmt processing 1039 bool inOldStyleParameterStmt_{false}; 1040 // Set when walking DATA & array constructor implied DO loop bounds 1041 // to warn about use of the implied DO intex therein. 1042 std::optional<SourceName> checkIndexUseInOwnBounds_; 1043 1044 bool HandleAttributeStmt(Attr, const std::list<parser::Name> &); 1045 Symbol &HandleAttributeStmt(Attr, const parser::Name &); 1046 Symbol &DeclareUnknownEntity(const parser::Name &, Attrs); 1047 Symbol &DeclareProcEntity(const parser::Name &, Attrs, const ProcInterface &); 1048 void SetType(const parser::Name &, const DeclTypeSpec &); 1049 std::optional<DerivedTypeSpec> ResolveDerivedType(const parser::Name &); 1050 std::optional<DerivedTypeSpec> ResolveExtendsType( 1051 const parser::Name &, const parser::Name *); 1052 Symbol *MakeTypeSymbol(const SourceName &, Details &&); 1053 Symbol *MakeTypeSymbol(const parser::Name &, Details &&); 1054 bool OkToAddComponent(const parser::Name &, const Symbol * = nullptr); 1055 ParamValue GetParamValue( 1056 const parser::TypeParamValue &, common::TypeParamAttr attr); 1057 void CheckCommonBlockDerivedType(const SourceName &, const Symbol &); 1058 std::optional<MessageFixedText> CheckSaveAttr(const Symbol &); 1059 Attrs HandleSaveName(const SourceName &, Attrs); 1060 void AddSaveName(std::set<SourceName> &, const SourceName &); 1061 void SetSaveAttr(Symbol &); 1062 bool HandleUnrestrictedSpecificIntrinsicFunction(const parser::Name &); 1063 const parser::Name *FindComponent(const parser::Name *, const parser::Name &); 1064 void Initialization(const parser::Name &, const parser::Initialization &, 1065 bool inComponentDecl); 1066 bool PassesLocalityChecks(const parser::Name &name, Symbol &symbol); 1067 bool CheckForHostAssociatedImplicit(const parser::Name &); 1068 1069 // Declare an object or procedure entity. 1070 // T is one of: EntityDetails, ObjectEntityDetails, ProcEntityDetails 1071 template <typename T> 1072 Symbol &DeclareEntity(const parser::Name &name, Attrs attrs) { 1073 Symbol &symbol{MakeSymbol(name, attrs)}; 1074 if (context().HasError(symbol) || symbol.has<T>()) { 1075 return symbol; // OK or error already reported 1076 } else if (symbol.has<UnknownDetails>()) { 1077 symbol.set_details(T{}); 1078 return symbol; 1079 } else if (auto *details{symbol.detailsIf<EntityDetails>()}) { 1080 symbol.set_details(T{std::move(*details)}); 1081 return symbol; 1082 } else if (std::is_same_v<EntityDetails, T> && 1083 (symbol.has<ObjectEntityDetails>() || 1084 symbol.has<ProcEntityDetails>())) { 1085 return symbol; // OK 1086 } else if (auto *details{symbol.detailsIf<UseDetails>()}) { 1087 Say(name.source, 1088 "'%s' is use-associated from module '%s' and cannot be re-declared"_err_en_US, 1089 name.source, GetUsedModule(*details).name()); 1090 } else if (auto *details{symbol.detailsIf<SubprogramNameDetails>()}) { 1091 if (details->kind() == SubprogramKind::Module) { 1092 Say2(name, 1093 "Declaration of '%s' conflicts with its use as module procedure"_err_en_US, 1094 symbol, "Module procedure definition"_en_US); 1095 } else if (details->kind() == SubprogramKind::Internal) { 1096 Say2(name, 1097 "Declaration of '%s' conflicts with its use as internal procedure"_err_en_US, 1098 symbol, "Internal procedure definition"_en_US); 1099 } else { 1100 DIE("unexpected kind"); 1101 } 1102 } else if (std::is_same_v<ObjectEntityDetails, T> && 1103 symbol.has<ProcEntityDetails>()) { 1104 SayWithDecl( 1105 name, symbol, "'%s' is already declared as a procedure"_err_en_US); 1106 } else if (std::is_same_v<ProcEntityDetails, T> && 1107 symbol.has<ObjectEntityDetails>()) { 1108 if (InCommonBlock(symbol)) { 1109 SayWithDecl(name, symbol, 1110 "'%s' may not be a procedure as it is in a COMMON block"_err_en_US); 1111 } else { 1112 SayWithDecl( 1113 name, symbol, "'%s' is already declared as an object"_err_en_US); 1114 } 1115 } else if (!CheckPossibleBadForwardRef(symbol)) { 1116 SayAlreadyDeclared(name, symbol); 1117 } 1118 context().SetError(symbol); 1119 return symbol; 1120 } 1121 bool HasCycle(const Symbol &, const ProcInterface &); 1122 }; 1123 1124 // Resolve construct entities and statement entities. 1125 // Check that construct names don't conflict with other names. 1126 class ConstructVisitor : public virtual DeclarationVisitor { 1127 public: 1128 bool Pre(const parser::ConcurrentHeader &); 1129 bool Pre(const parser::LocalitySpec::Local &); 1130 bool Pre(const parser::LocalitySpec::LocalInit &); 1131 bool Pre(const parser::LocalitySpec::Shared &); 1132 bool Pre(const parser::AcSpec &); 1133 bool Pre(const parser::AcImpliedDo &); 1134 bool Pre(const parser::DataImpliedDo &); 1135 bool Pre(const parser::DataIDoObject &); 1136 bool Pre(const parser::DataStmtObject &); 1137 bool Pre(const parser::DataStmtValue &); 1138 bool Pre(const parser::DoConstruct &); 1139 void Post(const parser::DoConstruct &); 1140 bool Pre(const parser::ForallConstruct &); 1141 void Post(const parser::ForallConstruct &); 1142 bool Pre(const parser::ForallStmt &); 1143 void Post(const parser::ForallStmt &); 1144 bool Pre(const parser::BlockStmt &); 1145 bool Pre(const parser::EndBlockStmt &); 1146 void Post(const parser::Selector &); 1147 void Post(const parser::AssociateStmt &); 1148 void Post(const parser::EndAssociateStmt &); 1149 bool Pre(const parser::Association &); 1150 void Post(const parser::SelectTypeStmt &); 1151 void Post(const parser::SelectRankStmt &); 1152 bool Pre(const parser::SelectTypeConstruct &); 1153 void Post(const parser::SelectTypeConstruct &); 1154 bool Pre(const parser::SelectTypeConstruct::TypeCase &); 1155 void Post(const parser::SelectTypeConstruct::TypeCase &); 1156 // Creates Block scopes with neither symbol name nor symbol details. 1157 bool Pre(const parser::SelectRankConstruct::RankCase &); 1158 void Post(const parser::SelectRankConstruct::RankCase &); 1159 void Post(const parser::TypeGuardStmt::Guard &); 1160 void Post(const parser::SelectRankCaseStmt::Rank &); 1161 bool Pre(const parser::ChangeTeamStmt &); 1162 void Post(const parser::EndChangeTeamStmt &); 1163 void Post(const parser::CoarrayAssociation &); 1164 1165 // Definitions of construct names 1166 bool Pre(const parser::WhereConstructStmt &x) { return CheckDef(x.t); } 1167 bool Pre(const parser::ForallConstructStmt &x) { return CheckDef(x.t); } 1168 bool Pre(const parser::CriticalStmt &x) { return CheckDef(x.t); } 1169 bool Pre(const parser::LabelDoStmt &) { 1170 return false; // error recovery 1171 } 1172 bool Pre(const parser::NonLabelDoStmt &x) { return CheckDef(x.t); } 1173 bool Pre(const parser::IfThenStmt &x) { return CheckDef(x.t); } 1174 bool Pre(const parser::SelectCaseStmt &x) { return CheckDef(x.t); } 1175 bool Pre(const parser::SelectRankConstruct &); 1176 void Post(const parser::SelectRankConstruct &); 1177 bool Pre(const parser::SelectRankStmt &x) { 1178 return CheckDef(std::get<0>(x.t)); 1179 } 1180 bool Pre(const parser::SelectTypeStmt &x) { 1181 return CheckDef(std::get<0>(x.t)); 1182 } 1183 1184 // References to construct names 1185 void Post(const parser::MaskedElsewhereStmt &x) { CheckRef(x.t); } 1186 void Post(const parser::ElsewhereStmt &x) { CheckRef(x.v); } 1187 void Post(const parser::EndWhereStmt &x) { CheckRef(x.v); } 1188 void Post(const parser::EndForallStmt &x) { CheckRef(x.v); } 1189 void Post(const parser::EndCriticalStmt &x) { CheckRef(x.v); } 1190 void Post(const parser::EndDoStmt &x) { CheckRef(x.v); } 1191 void Post(const parser::ElseIfStmt &x) { CheckRef(x.t); } 1192 void Post(const parser::ElseStmt &x) { CheckRef(x.v); } 1193 void Post(const parser::EndIfStmt &x) { CheckRef(x.v); } 1194 void Post(const parser::CaseStmt &x) { CheckRef(x.t); } 1195 void Post(const parser::EndSelectStmt &x) { CheckRef(x.v); } 1196 void Post(const parser::SelectRankCaseStmt &x) { CheckRef(x.t); } 1197 void Post(const parser::TypeGuardStmt &x) { CheckRef(x.t); } 1198 void Post(const parser::CycleStmt &x) { CheckRef(x.v); } 1199 void Post(const parser::ExitStmt &x) { CheckRef(x.v); } 1200 1201 private: 1202 // R1105 selector -> expr | variable 1203 // expr is set in either case unless there were errors 1204 struct Selector { 1205 Selector() {} 1206 Selector(const SourceName &source, MaybeExpr &&expr) 1207 : source{source}, expr{std::move(expr)} {} 1208 operator bool() const { return expr.has_value(); } 1209 parser::CharBlock source; 1210 MaybeExpr expr; 1211 }; 1212 // association -> [associate-name =>] selector 1213 struct Association { 1214 const parser::Name *name{nullptr}; 1215 Selector selector; 1216 }; 1217 std::vector<Association> associationStack_; 1218 Association *currentAssociation_{nullptr}; 1219 1220 template <typename T> bool CheckDef(const T &t) { 1221 return CheckDef(std::get<std::optional<parser::Name>>(t)); 1222 } 1223 template <typename T> void CheckRef(const T &t) { 1224 CheckRef(std::get<std::optional<parser::Name>>(t)); 1225 } 1226 bool CheckDef(const std::optional<parser::Name> &); 1227 void CheckRef(const std::optional<parser::Name> &); 1228 const DeclTypeSpec &ToDeclTypeSpec(evaluate::DynamicType &&); 1229 const DeclTypeSpec &ToDeclTypeSpec( 1230 evaluate::DynamicType &&, MaybeSubscriptIntExpr &&length); 1231 Symbol *MakeAssocEntity(); 1232 void SetTypeFromAssociation(Symbol &); 1233 void SetAttrsFromAssociation(Symbol &); 1234 Selector ResolveSelector(const parser::Selector &); 1235 void ResolveIndexName(const parser::ConcurrentControl &control); 1236 void SetCurrentAssociation(std::size_t n); 1237 Association &GetCurrentAssociation(); 1238 void PushAssociation(); 1239 void PopAssociation(std::size_t count = 1); 1240 }; 1241 1242 // Create scopes for OpenACC constructs 1243 class AccVisitor : public virtual DeclarationVisitor { 1244 public: 1245 void AddAccSourceRange(const parser::CharBlock &); 1246 1247 static bool NeedsScope(const parser::OpenACCBlockConstruct &); 1248 1249 bool Pre(const parser::OpenACCBlockConstruct &); 1250 void Post(const parser::OpenACCBlockConstruct &); 1251 bool Pre(const parser::AccBeginBlockDirective &x) { 1252 AddAccSourceRange(x.source); 1253 return true; 1254 } 1255 void Post(const parser::AccBeginBlockDirective &) { 1256 messageHandler().set_currStmtSource(std::nullopt); 1257 } 1258 bool Pre(const parser::AccEndBlockDirective &x) { 1259 AddAccSourceRange(x.source); 1260 return true; 1261 } 1262 void Post(const parser::AccEndBlockDirective &) { 1263 messageHandler().set_currStmtSource(std::nullopt); 1264 } 1265 bool Pre(const parser::AccBeginLoopDirective &x) { 1266 AddAccSourceRange(x.source); 1267 return true; 1268 } 1269 void Post(const parser::AccBeginLoopDirective &x) { 1270 messageHandler().set_currStmtSource(std::nullopt); 1271 } 1272 }; 1273 1274 bool AccVisitor::NeedsScope(const parser::OpenACCBlockConstruct &x) { 1275 const auto &beginBlockDir{std::get<parser::AccBeginBlockDirective>(x.t)}; 1276 const auto &beginDir{std::get<parser::AccBlockDirective>(beginBlockDir.t)}; 1277 switch (beginDir.v) { 1278 case llvm::acc::Directive::ACCD_data: 1279 case llvm::acc::Directive::ACCD_host_data: 1280 case llvm::acc::Directive::ACCD_kernels: 1281 case llvm::acc::Directive::ACCD_parallel: 1282 case llvm::acc::Directive::ACCD_serial: 1283 return true; 1284 default: 1285 return false; 1286 } 1287 } 1288 1289 void AccVisitor::AddAccSourceRange(const parser::CharBlock &source) { 1290 messageHandler().set_currStmtSource(source); 1291 currScope().AddSourceRange(source); 1292 } 1293 1294 bool AccVisitor::Pre(const parser::OpenACCBlockConstruct &x) { 1295 if (NeedsScope(x)) { 1296 PushScope(Scope::Kind::Block, nullptr); 1297 } 1298 return true; 1299 } 1300 1301 void AccVisitor::Post(const parser::OpenACCBlockConstruct &x) { 1302 if (NeedsScope(x)) { 1303 PopScope(); 1304 } 1305 } 1306 1307 // Create scopes for OpenMP constructs 1308 class OmpVisitor : public virtual DeclarationVisitor { 1309 public: 1310 void AddOmpSourceRange(const parser::CharBlock &); 1311 1312 static bool NeedsScope(const parser::OpenMPBlockConstruct &); 1313 1314 bool Pre(const parser::OpenMPBlockConstruct &); 1315 void Post(const parser::OpenMPBlockConstruct &); 1316 bool Pre(const parser::OmpBeginBlockDirective &x) { 1317 AddOmpSourceRange(x.source); 1318 return true; 1319 } 1320 void Post(const parser::OmpBeginBlockDirective &) { 1321 messageHandler().set_currStmtSource(std::nullopt); 1322 } 1323 bool Pre(const parser::OmpEndBlockDirective &x) { 1324 AddOmpSourceRange(x.source); 1325 return true; 1326 } 1327 void Post(const parser::OmpEndBlockDirective &) { 1328 messageHandler().set_currStmtSource(std::nullopt); 1329 } 1330 1331 bool Pre(const parser::OpenMPLoopConstruct &) { 1332 PushScope(Scope::Kind::Block, nullptr); 1333 return true; 1334 } 1335 void Post(const parser::OpenMPLoopConstruct &) { PopScope(); } 1336 bool Pre(const parser::OmpBeginLoopDirective &x) { 1337 AddOmpSourceRange(x.source); 1338 return true; 1339 } 1340 void Post(const parser::OmpBeginLoopDirective &) { 1341 messageHandler().set_currStmtSource(std::nullopt); 1342 } 1343 bool Pre(const parser::OmpEndLoopDirective &x) { 1344 AddOmpSourceRange(x.source); 1345 return true; 1346 } 1347 void Post(const parser::OmpEndLoopDirective &) { 1348 messageHandler().set_currStmtSource(std::nullopt); 1349 } 1350 1351 bool Pre(const parser::OpenMPSectionsConstruct &) { 1352 PushScope(Scope::Kind::Block, nullptr); 1353 return true; 1354 } 1355 void Post(const parser::OpenMPSectionsConstruct &) { PopScope(); } 1356 bool Pre(const parser::OmpBeginSectionsDirective &x) { 1357 AddOmpSourceRange(x.source); 1358 return true; 1359 } 1360 void Post(const parser::OmpBeginSectionsDirective &) { 1361 messageHandler().set_currStmtSource(std::nullopt); 1362 } 1363 bool Pre(const parser::OmpEndSectionsDirective &x) { 1364 AddOmpSourceRange(x.source); 1365 return true; 1366 } 1367 void Post(const parser::OmpEndSectionsDirective &) { 1368 messageHandler().set_currStmtSource(std::nullopt); 1369 } 1370 }; 1371 1372 bool OmpVisitor::NeedsScope(const parser::OpenMPBlockConstruct &x) { 1373 const auto &beginBlockDir{std::get<parser::OmpBeginBlockDirective>(x.t)}; 1374 const auto &beginDir{std::get<parser::OmpBlockDirective>(beginBlockDir.t)}; 1375 switch (beginDir.v) { 1376 case llvm::omp::Directive::OMPD_target_data: 1377 case llvm::omp::Directive::OMPD_master: 1378 case llvm::omp::Directive::OMPD_ordered: 1379 case llvm::omp::Directive::OMPD_taskgroup: 1380 return false; 1381 default: 1382 return true; 1383 } 1384 } 1385 1386 void OmpVisitor::AddOmpSourceRange(const parser::CharBlock &source) { 1387 messageHandler().set_currStmtSource(source); 1388 currScope().AddSourceRange(source); 1389 } 1390 1391 bool OmpVisitor::Pre(const parser::OpenMPBlockConstruct &x) { 1392 if (NeedsScope(x)) { 1393 PushScope(Scope::Kind::Block, nullptr); 1394 } 1395 return true; 1396 } 1397 1398 void OmpVisitor::Post(const parser::OpenMPBlockConstruct &x) { 1399 if (NeedsScope(x)) { 1400 PopScope(); 1401 } 1402 } 1403 1404 // Walk the parse tree and resolve names to symbols. 1405 class ResolveNamesVisitor : public virtual ScopeHandler, 1406 public ModuleVisitor, 1407 public SubprogramVisitor, 1408 public ConstructVisitor, 1409 public OmpVisitor, 1410 public AccVisitor { 1411 public: 1412 using AccVisitor::Post; 1413 using AccVisitor::Pre; 1414 using ArraySpecVisitor::Post; 1415 using ConstructVisitor::Post; 1416 using ConstructVisitor::Pre; 1417 using DeclarationVisitor::Post; 1418 using DeclarationVisitor::Pre; 1419 using ImplicitRulesVisitor::Post; 1420 using ImplicitRulesVisitor::Pre; 1421 using InterfaceVisitor::Post; 1422 using InterfaceVisitor::Pre; 1423 using ModuleVisitor::Post; 1424 using ModuleVisitor::Pre; 1425 using OmpVisitor::Post; 1426 using OmpVisitor::Pre; 1427 using ScopeHandler::Post; 1428 using ScopeHandler::Pre; 1429 using SubprogramVisitor::Post; 1430 using SubprogramVisitor::Pre; 1431 1432 ResolveNamesVisitor( 1433 SemanticsContext &context, ImplicitRulesMap &rules, Scope &top) 1434 : BaseVisitor{context, *this, rules}, topScope_{top} { 1435 PushScope(top); 1436 } 1437 1438 Scope &topScope() const { return topScope_; } 1439 1440 // Default action for a parse tree node is to visit children. 1441 template <typename T> bool Pre(const T &) { return true; } 1442 template <typename T> void Post(const T &) {} 1443 1444 bool Pre(const parser::SpecificationPart &); 1445 void Post(const parser::Program &); 1446 bool Pre(const parser::ImplicitStmt &); 1447 void Post(const parser::PointerObject &); 1448 void Post(const parser::AllocateObject &); 1449 bool Pre(const parser::PointerAssignmentStmt &); 1450 void Post(const parser::Designator &); 1451 template <typename A, typename B> 1452 void Post(const parser::LoopBounds<A, B> &x) { 1453 ResolveName(*parser::Unwrap<parser::Name>(x.name)); 1454 } 1455 void Post(const parser::ProcComponentRef &); 1456 bool Pre(const parser::FunctionReference &); 1457 bool Pre(const parser::CallStmt &); 1458 bool Pre(const parser::ImportStmt &); 1459 void Post(const parser::TypeGuardStmt &); 1460 bool Pre(const parser::StmtFunctionStmt &); 1461 bool Pre(const parser::DefinedOpName &); 1462 bool Pre(const parser::ProgramUnit &); 1463 void Post(const parser::AssignStmt &); 1464 void Post(const parser::AssignedGotoStmt &); 1465 1466 // These nodes should never be reached: they are handled in ProgramUnit 1467 bool Pre(const parser::MainProgram &) { 1468 llvm_unreachable("This node is handled in ProgramUnit"); 1469 } 1470 bool Pre(const parser::FunctionSubprogram &) { 1471 llvm_unreachable("This node is handled in ProgramUnit"); 1472 } 1473 bool Pre(const parser::SubroutineSubprogram &) { 1474 llvm_unreachable("This node is handled in ProgramUnit"); 1475 } 1476 bool Pre(const parser::SeparateModuleSubprogram &) { 1477 llvm_unreachable("This node is handled in ProgramUnit"); 1478 } 1479 bool Pre(const parser::Module &) { 1480 llvm_unreachable("This node is handled in ProgramUnit"); 1481 } 1482 bool Pre(const parser::Submodule &) { 1483 llvm_unreachable("This node is handled in ProgramUnit"); 1484 } 1485 bool Pre(const parser::BlockData &) { 1486 llvm_unreachable("This node is handled in ProgramUnit"); 1487 } 1488 1489 void NoteExecutablePartCall(Symbol::Flag, const parser::Call &); 1490 1491 friend void ResolveSpecificationParts(SemanticsContext &, const Symbol &); 1492 1493 private: 1494 // Kind of procedure we are expecting to see in a ProcedureDesignator 1495 std::optional<Symbol::Flag> expectedProcFlag_; 1496 std::optional<SourceName> prevImportStmt_; 1497 Scope &topScope_; 1498 1499 void PreSpecificationConstruct(const parser::SpecificationConstruct &); 1500 void CreateCommonBlockSymbols(const parser::CommonStmt &); 1501 void CreateGeneric(const parser::GenericSpec &); 1502 void FinishSpecificationPart(const std::list<parser::DeclarationConstruct> &); 1503 void AnalyzeStmtFunctionStmt(const parser::StmtFunctionStmt &); 1504 void CheckImports(); 1505 void CheckImport(const SourceName &, const SourceName &); 1506 void HandleCall(Symbol::Flag, const parser::Call &); 1507 void HandleProcedureName(Symbol::Flag, const parser::Name &); 1508 bool CheckImplicitNoneExternal(const SourceName &, const Symbol &); 1509 bool SetProcFlag(const parser::Name &, Symbol &, Symbol::Flag); 1510 void ResolveSpecificationParts(ProgramTree &); 1511 void AddSubpNames(ProgramTree &); 1512 bool BeginScopeForNode(const ProgramTree &); 1513 void EndScopeForNode(const ProgramTree &); 1514 void FinishSpecificationParts(const ProgramTree &); 1515 void FinishDerivedTypeInstantiation(Scope &); 1516 void ResolveExecutionParts(const ProgramTree &); 1517 }; 1518 1519 // ImplicitRules implementation 1520 1521 bool ImplicitRules::isImplicitNoneType() const { 1522 if (isImplicitNoneType_) { 1523 return true; 1524 } else if (map_.empty() && inheritFromParent_) { 1525 return parent_->isImplicitNoneType(); 1526 } else { 1527 return false; // default if not specified 1528 } 1529 } 1530 1531 bool ImplicitRules::isImplicitNoneExternal() const { 1532 if (isImplicitNoneExternal_) { 1533 return true; 1534 } else if (inheritFromParent_) { 1535 return parent_->isImplicitNoneExternal(); 1536 } else { 1537 return false; // default if not specified 1538 } 1539 } 1540 1541 const DeclTypeSpec *ImplicitRules::GetType( 1542 SourceName name, bool respectImplicitNoneType) const { 1543 char ch{name.begin()[0]}; 1544 if (isImplicitNoneType_ && respectImplicitNoneType) { 1545 return nullptr; 1546 } else if (auto it{map_.find(ch)}; it != map_.end()) { 1547 return &*it->second; 1548 } else if (inheritFromParent_) { 1549 return parent_->GetType(name, respectImplicitNoneType); 1550 } else if (ch >= 'i' && ch <= 'n') { 1551 return &context_.MakeNumericType(TypeCategory::Integer); 1552 } else if (ch >= 'a' && ch <= 'z') { 1553 return &context_.MakeNumericType(TypeCategory::Real); 1554 } else { 1555 return nullptr; 1556 } 1557 } 1558 1559 void ImplicitRules::SetTypeMapping(const DeclTypeSpec &type, 1560 parser::Location fromLetter, parser::Location toLetter) { 1561 for (char ch = *fromLetter; ch; ch = ImplicitRules::Incr(ch)) { 1562 auto res{map_.emplace(ch, type)}; 1563 if (!res.second) { 1564 context_.Say(parser::CharBlock{fromLetter}, 1565 "More than one implicit type specified for '%c'"_err_en_US, ch); 1566 } 1567 if (ch == *toLetter) { 1568 break; 1569 } 1570 } 1571 } 1572 1573 // Return the next char after ch in a way that works for ASCII or EBCDIC. 1574 // Return '\0' for the char after 'z'. 1575 char ImplicitRules::Incr(char ch) { 1576 switch (ch) { 1577 case 'i': 1578 return 'j'; 1579 case 'r': 1580 return 's'; 1581 case 'z': 1582 return '\0'; 1583 default: 1584 return ch + 1; 1585 } 1586 } 1587 1588 llvm::raw_ostream &operator<<( 1589 llvm::raw_ostream &o, const ImplicitRules &implicitRules) { 1590 o << "ImplicitRules:\n"; 1591 for (char ch = 'a'; ch; ch = ImplicitRules::Incr(ch)) { 1592 ShowImplicitRule(o, implicitRules, ch); 1593 } 1594 ShowImplicitRule(o, implicitRules, '_'); 1595 ShowImplicitRule(o, implicitRules, '$'); 1596 ShowImplicitRule(o, implicitRules, '@'); 1597 return o; 1598 } 1599 void ShowImplicitRule( 1600 llvm::raw_ostream &o, const ImplicitRules &implicitRules, char ch) { 1601 auto it{implicitRules.map_.find(ch)}; 1602 if (it != implicitRules.map_.end()) { 1603 o << " " << ch << ": " << *it->second << '\n'; 1604 } 1605 } 1606 1607 template <typename T> void BaseVisitor::Walk(const T &x) { 1608 parser::Walk(x, *this_); 1609 } 1610 1611 void BaseVisitor::MakePlaceholder( 1612 const parser::Name &name, MiscDetails::Kind kind) { 1613 if (!name.symbol) { 1614 name.symbol = &context_->globalScope().MakeSymbol( 1615 name.source, Attrs{}, MiscDetails{kind}); 1616 } 1617 } 1618 1619 // AttrsVisitor implementation 1620 1621 bool AttrsVisitor::BeginAttrs() { 1622 CHECK(!attrs_); 1623 attrs_ = std::make_optional<Attrs>(); 1624 return true; 1625 } 1626 Attrs AttrsVisitor::GetAttrs() { 1627 CHECK(attrs_); 1628 return *attrs_; 1629 } 1630 Attrs AttrsVisitor::EndAttrs() { 1631 Attrs result{GetAttrs()}; 1632 attrs_.reset(); 1633 passName_ = std::nullopt; 1634 bindName_.reset(); 1635 return result; 1636 } 1637 1638 bool AttrsVisitor::SetPassNameOn(Symbol &symbol) { 1639 if (!passName_) { 1640 return false; 1641 } 1642 common::visit(common::visitors{ 1643 [&](ProcEntityDetails &x) { x.set_passName(*passName_); }, 1644 [&](ProcBindingDetails &x) { x.set_passName(*passName_); }, 1645 [](auto &) { common::die("unexpected pass name"); }, 1646 }, 1647 symbol.details()); 1648 return true; 1649 } 1650 1651 void AttrsVisitor::SetBindNameOn(Symbol &symbol) { 1652 if (!attrs_ || !attrs_->test(Attr::BIND_C)) { 1653 return; 1654 } 1655 std::optional<std::string> label{ 1656 evaluate::GetScalarConstantValue<evaluate::Ascii>(bindName_)}; 1657 // 18.9.2(2): discard leading and trailing blanks, ignore if all blank 1658 if (label) { 1659 auto first{label->find_first_not_of(" ")}; 1660 if (first == std::string::npos) { 1661 // Empty NAME= means no binding at all (18.10.2p2) 1662 Say(currStmtSource().value(), "Blank binding label ignored"_warn_en_US); 1663 return; 1664 } 1665 auto last{label->find_last_not_of(" ")}; 1666 label = label->substr(first, last - first + 1); 1667 } else { 1668 label = parser::ToLowerCaseLetters(symbol.name().ToString()); 1669 } 1670 symbol.SetBindName(std::move(*label)); 1671 } 1672 1673 void AttrsVisitor::Post(const parser::LanguageBindingSpec &x) { 1674 CHECK(attrs_); 1675 if (CheckAndSet(Attr::BIND_C)) { 1676 if (x.v) { 1677 bindName_ = EvaluateExpr(*x.v); 1678 } 1679 } 1680 } 1681 bool AttrsVisitor::Pre(const parser::IntentSpec &x) { 1682 CHECK(attrs_); 1683 CheckAndSet(IntentSpecToAttr(x)); 1684 return false; 1685 } 1686 bool AttrsVisitor::Pre(const parser::Pass &x) { 1687 if (CheckAndSet(Attr::PASS)) { 1688 if (x.v) { 1689 passName_ = x.v->source; 1690 MakePlaceholder(*x.v, MiscDetails::Kind::PassName); 1691 } 1692 } 1693 return false; 1694 } 1695 1696 // C730, C743, C755, C778, C1543 say no attribute or prefix repetitions 1697 bool AttrsVisitor::IsDuplicateAttr(Attr attrName) { 1698 if (attrs_->test(attrName)) { 1699 Say(currStmtSource().value(), 1700 "Attribute '%s' cannot be used more than once"_warn_en_US, 1701 AttrToString(attrName)); 1702 return true; 1703 } 1704 return false; 1705 } 1706 1707 // See if attrName violates a constraint cause by a conflict. attr1 and attr2 1708 // name attributes that cannot be used on the same declaration 1709 bool AttrsVisitor::HaveAttrConflict(Attr attrName, Attr attr1, Attr attr2) { 1710 if ((attrName == attr1 && attrs_->test(attr2)) || 1711 (attrName == attr2 && attrs_->test(attr1))) { 1712 Say(currStmtSource().value(), 1713 "Attributes '%s' and '%s' conflict with each other"_err_en_US, 1714 AttrToString(attr1), AttrToString(attr2)); 1715 return true; 1716 } 1717 return false; 1718 } 1719 // C759, C1543 1720 bool AttrsVisitor::IsConflictingAttr(Attr attrName) { 1721 return HaveAttrConflict(attrName, Attr::INTENT_IN, Attr::INTENT_INOUT) || 1722 HaveAttrConflict(attrName, Attr::INTENT_IN, Attr::INTENT_OUT) || 1723 HaveAttrConflict(attrName, Attr::INTENT_INOUT, Attr::INTENT_OUT) || 1724 HaveAttrConflict(attrName, Attr::PASS, Attr::NOPASS) || // C781 1725 HaveAttrConflict(attrName, Attr::PURE, Attr::IMPURE) || 1726 HaveAttrConflict(attrName, Attr::PUBLIC, Attr::PRIVATE) || 1727 HaveAttrConflict(attrName, Attr::RECURSIVE, Attr::NON_RECURSIVE); 1728 } 1729 bool AttrsVisitor::CheckAndSet(Attr attrName) { 1730 CHECK(attrs_); 1731 if (IsConflictingAttr(attrName) || IsDuplicateAttr(attrName)) { 1732 return false; 1733 } 1734 attrs_->set(attrName); 1735 return true; 1736 } 1737 1738 // DeclTypeSpecVisitor implementation 1739 1740 const DeclTypeSpec *DeclTypeSpecVisitor::GetDeclTypeSpec() { 1741 return state_.declTypeSpec; 1742 } 1743 1744 void DeclTypeSpecVisitor::BeginDeclTypeSpec() { 1745 CHECK(!state_.expectDeclTypeSpec); 1746 CHECK(!state_.declTypeSpec); 1747 state_.expectDeclTypeSpec = true; 1748 } 1749 void DeclTypeSpecVisitor::EndDeclTypeSpec() { 1750 CHECK(state_.expectDeclTypeSpec); 1751 state_ = {}; 1752 } 1753 1754 void DeclTypeSpecVisitor::SetDeclTypeSpecCategory( 1755 DeclTypeSpec::Category category) { 1756 CHECK(state_.expectDeclTypeSpec); 1757 state_.derived.category = category; 1758 } 1759 1760 bool DeclTypeSpecVisitor::Pre(const parser::TypeGuardStmt &) { 1761 BeginDeclTypeSpec(); 1762 return true; 1763 } 1764 void DeclTypeSpecVisitor::Post(const parser::TypeGuardStmt &) { 1765 EndDeclTypeSpec(); 1766 } 1767 1768 void DeclTypeSpecVisitor::Post(const parser::TypeSpec &typeSpec) { 1769 // Record the resolved DeclTypeSpec in the parse tree for use by 1770 // expression semantics if the DeclTypeSpec is a valid TypeSpec. 1771 // The grammar ensures that it's an intrinsic or derived type spec, 1772 // not TYPE(*) or CLASS(*) or CLASS(T). 1773 if (const DeclTypeSpec * spec{state_.declTypeSpec}) { 1774 switch (spec->category()) { 1775 case DeclTypeSpec::Numeric: 1776 case DeclTypeSpec::Logical: 1777 case DeclTypeSpec::Character: 1778 typeSpec.declTypeSpec = spec; 1779 break; 1780 case DeclTypeSpec::TypeDerived: 1781 if (const DerivedTypeSpec * derived{spec->AsDerived()}) { 1782 CheckForAbstractType(derived->typeSymbol()); // C703 1783 typeSpec.declTypeSpec = spec; 1784 } 1785 break; 1786 default: 1787 CRASH_NO_CASE; 1788 } 1789 } 1790 } 1791 1792 void DeclTypeSpecVisitor::Post( 1793 const parser::IntrinsicTypeSpec::DoublePrecision &) { 1794 MakeNumericType(TypeCategory::Real, context().doublePrecisionKind()); 1795 } 1796 void DeclTypeSpecVisitor::Post( 1797 const parser::IntrinsicTypeSpec::DoubleComplex &) { 1798 MakeNumericType(TypeCategory::Complex, context().doublePrecisionKind()); 1799 } 1800 void DeclTypeSpecVisitor::MakeNumericType(TypeCategory category, int kind) { 1801 SetDeclTypeSpec(context().MakeNumericType(category, kind)); 1802 } 1803 1804 void DeclTypeSpecVisitor::CheckForAbstractType(const Symbol &typeSymbol) { 1805 if (typeSymbol.attrs().test(Attr::ABSTRACT)) { 1806 Say("ABSTRACT derived type may not be used here"_err_en_US); 1807 } 1808 } 1809 1810 void DeclTypeSpecVisitor::Post(const parser::DeclarationTypeSpec::ClassStar &) { 1811 SetDeclTypeSpec(context().globalScope().MakeClassStarType()); 1812 } 1813 void DeclTypeSpecVisitor::Post(const parser::DeclarationTypeSpec::TypeStar &) { 1814 SetDeclTypeSpec(context().globalScope().MakeTypeStarType()); 1815 } 1816 1817 // Check that we're expecting to see a DeclTypeSpec (and haven't seen one yet) 1818 // and save it in state_.declTypeSpec. 1819 void DeclTypeSpecVisitor::SetDeclTypeSpec(const DeclTypeSpec &declTypeSpec) { 1820 CHECK(state_.expectDeclTypeSpec); 1821 CHECK(!state_.declTypeSpec); 1822 state_.declTypeSpec = &declTypeSpec; 1823 } 1824 1825 KindExpr DeclTypeSpecVisitor::GetKindParamExpr( 1826 TypeCategory category, const std::optional<parser::KindSelector> &kind) { 1827 return AnalyzeKindSelector(context(), category, kind); 1828 } 1829 1830 // MessageHandler implementation 1831 1832 Message &MessageHandler::Say(MessageFixedText &&msg) { 1833 return context_->Say(currStmtSource().value(), std::move(msg)); 1834 } 1835 Message &MessageHandler::Say(MessageFormattedText &&msg) { 1836 return context_->Say(currStmtSource().value(), std::move(msg)); 1837 } 1838 Message &MessageHandler::Say(const SourceName &name, MessageFixedText &&msg) { 1839 return Say(name, std::move(msg), name); 1840 } 1841 1842 // ImplicitRulesVisitor implementation 1843 1844 void ImplicitRulesVisitor::Post(const parser::ParameterStmt &) { 1845 prevParameterStmt_ = currStmtSource(); 1846 } 1847 1848 bool ImplicitRulesVisitor::Pre(const parser::ImplicitStmt &x) { 1849 bool result{ 1850 common::visit(common::visitors{ 1851 [&](const std::list<ImplicitNoneNameSpec> &y) { 1852 return HandleImplicitNone(y); 1853 }, 1854 [&](const std::list<parser::ImplicitSpec> &) { 1855 if (prevImplicitNoneType_) { 1856 Say("IMPLICIT statement after IMPLICIT NONE or " 1857 "IMPLICIT NONE(TYPE) statement"_err_en_US); 1858 return false; 1859 } 1860 implicitRules_->set_isImplicitNoneType(false); 1861 return true; 1862 }, 1863 }, 1864 x.u)}; 1865 prevImplicit_ = currStmtSource(); 1866 return result; 1867 } 1868 1869 bool ImplicitRulesVisitor::Pre(const parser::LetterSpec &x) { 1870 auto loLoc{std::get<parser::Location>(x.t)}; 1871 auto hiLoc{loLoc}; 1872 if (auto hiLocOpt{std::get<std::optional<parser::Location>>(x.t)}) { 1873 hiLoc = *hiLocOpt; 1874 if (*hiLoc < *loLoc) { 1875 Say(hiLoc, "'%s' does not follow '%s' alphabetically"_err_en_US, 1876 std::string(hiLoc, 1), std::string(loLoc, 1)); 1877 return false; 1878 } 1879 } 1880 implicitRules_->SetTypeMapping(*GetDeclTypeSpec(), loLoc, hiLoc); 1881 return false; 1882 } 1883 1884 bool ImplicitRulesVisitor::Pre(const parser::ImplicitSpec &) { 1885 BeginDeclTypeSpec(); 1886 set_allowForwardReferenceToDerivedType(true); 1887 return true; 1888 } 1889 1890 void ImplicitRulesVisitor::Post(const parser::ImplicitSpec &) { 1891 EndDeclTypeSpec(); 1892 } 1893 1894 void ImplicitRulesVisitor::SetScope(const Scope &scope) { 1895 implicitRules_ = &DEREF(implicitRulesMap_).at(&scope); 1896 prevImplicit_ = std::nullopt; 1897 prevImplicitNone_ = std::nullopt; 1898 prevImplicitNoneType_ = std::nullopt; 1899 prevParameterStmt_ = std::nullopt; 1900 } 1901 void ImplicitRulesVisitor::BeginScope(const Scope &scope) { 1902 // find or create implicit rules for this scope 1903 DEREF(implicitRulesMap_).try_emplace(&scope, context(), implicitRules_); 1904 SetScope(scope); 1905 } 1906 1907 // TODO: for all of these errors, reference previous statement too 1908 bool ImplicitRulesVisitor::HandleImplicitNone( 1909 const std::list<ImplicitNoneNameSpec> &nameSpecs) { 1910 if (prevImplicitNone_) { 1911 Say("More than one IMPLICIT NONE statement"_err_en_US); 1912 Say(*prevImplicitNone_, "Previous IMPLICIT NONE statement"_en_US); 1913 return false; 1914 } 1915 if (prevParameterStmt_) { 1916 Say("IMPLICIT NONE statement after PARAMETER statement"_err_en_US); 1917 return false; 1918 } 1919 prevImplicitNone_ = currStmtSource(); 1920 bool implicitNoneTypeNever{ 1921 context().IsEnabled(common::LanguageFeature::ImplicitNoneTypeNever)}; 1922 if (nameSpecs.empty()) { 1923 if (!implicitNoneTypeNever) { 1924 prevImplicitNoneType_ = currStmtSource(); 1925 implicitRules_->set_isImplicitNoneType(true); 1926 if (prevImplicit_) { 1927 Say("IMPLICIT NONE statement after IMPLICIT statement"_err_en_US); 1928 return false; 1929 } 1930 } 1931 } else { 1932 int sawType{0}; 1933 int sawExternal{0}; 1934 for (const auto noneSpec : nameSpecs) { 1935 switch (noneSpec) { 1936 case ImplicitNoneNameSpec::External: 1937 implicitRules_->set_isImplicitNoneExternal(true); 1938 ++sawExternal; 1939 break; 1940 case ImplicitNoneNameSpec::Type: 1941 if (!implicitNoneTypeNever) { 1942 prevImplicitNoneType_ = currStmtSource(); 1943 implicitRules_->set_isImplicitNoneType(true); 1944 if (prevImplicit_) { 1945 Say("IMPLICIT NONE(TYPE) after IMPLICIT statement"_err_en_US); 1946 return false; 1947 } 1948 ++sawType; 1949 } 1950 break; 1951 } 1952 } 1953 if (sawType > 1) { 1954 Say("TYPE specified more than once in IMPLICIT NONE statement"_err_en_US); 1955 return false; 1956 } 1957 if (sawExternal > 1) { 1958 Say("EXTERNAL specified more than once in IMPLICIT NONE statement"_err_en_US); 1959 return false; 1960 } 1961 } 1962 return true; 1963 } 1964 1965 // ArraySpecVisitor implementation 1966 1967 void ArraySpecVisitor::Post(const parser::ArraySpec &x) { 1968 CHECK(arraySpec_.empty()); 1969 arraySpec_ = AnalyzeArraySpec(context(), x); 1970 } 1971 void ArraySpecVisitor::Post(const parser::ComponentArraySpec &x) { 1972 CHECK(arraySpec_.empty()); 1973 arraySpec_ = AnalyzeArraySpec(context(), x); 1974 } 1975 void ArraySpecVisitor::Post(const parser::CoarraySpec &x) { 1976 CHECK(coarraySpec_.empty()); 1977 coarraySpec_ = AnalyzeCoarraySpec(context(), x); 1978 } 1979 1980 const ArraySpec &ArraySpecVisitor::arraySpec() { 1981 return !arraySpec_.empty() ? arraySpec_ : attrArraySpec_; 1982 } 1983 const ArraySpec &ArraySpecVisitor::coarraySpec() { 1984 return !coarraySpec_.empty() ? coarraySpec_ : attrCoarraySpec_; 1985 } 1986 void ArraySpecVisitor::BeginArraySpec() { 1987 CHECK(arraySpec_.empty()); 1988 CHECK(coarraySpec_.empty()); 1989 CHECK(attrArraySpec_.empty()); 1990 CHECK(attrCoarraySpec_.empty()); 1991 } 1992 void ArraySpecVisitor::EndArraySpec() { 1993 CHECK(arraySpec_.empty()); 1994 CHECK(coarraySpec_.empty()); 1995 attrArraySpec_.clear(); 1996 attrCoarraySpec_.clear(); 1997 } 1998 void ArraySpecVisitor::PostAttrSpec() { 1999 // Save dimension/codimension from attrs so we can process array/coarray-spec 2000 // on the entity-decl 2001 if (!arraySpec_.empty()) { 2002 if (attrArraySpec_.empty()) { 2003 attrArraySpec_ = arraySpec_; 2004 arraySpec_.clear(); 2005 } else { 2006 Say(currStmtSource().value(), 2007 "Attribute 'DIMENSION' cannot be used more than once"_err_en_US); 2008 } 2009 } 2010 if (!coarraySpec_.empty()) { 2011 if (attrCoarraySpec_.empty()) { 2012 attrCoarraySpec_ = coarraySpec_; 2013 coarraySpec_.clear(); 2014 } else { 2015 Say(currStmtSource().value(), 2016 "Attribute 'CODIMENSION' cannot be used more than once"_err_en_US); 2017 } 2018 } 2019 } 2020 2021 // FuncResultStack implementation 2022 2023 FuncResultStack::~FuncResultStack() { CHECK(stack_.empty()); } 2024 2025 void FuncResultStack::CompleteFunctionResultType() { 2026 // If the function has a type in the prefix, process it now. 2027 if (IsFunction(scopeHandler_.currScope())) { 2028 FuncInfo &info{DEREF(Top())}; 2029 if (info.parsedType) { 2030 scopeHandler_.messageHandler().set_currStmtSource(info.source); 2031 if (const auto *type{ 2032 scopeHandler_.ProcessTypeSpec(*info.parsedType, true)}) { 2033 if (!scopeHandler_.context().HasError(info.resultSymbol)) { 2034 info.resultSymbol->SetType(*type); 2035 } 2036 } 2037 info.parsedType = nullptr; 2038 } 2039 } 2040 } 2041 2042 // Called from ConvertTo{Object/Proc}Entity to cope with any appearance 2043 // of the function result in a specification expression. 2044 void FuncResultStack::CompleteTypeIfFunctionResult(Symbol &symbol) { 2045 if (FuncInfo * info{Top()}) { 2046 if (info->resultSymbol == &symbol) { 2047 CompleteFunctionResultType(); 2048 } 2049 } 2050 } 2051 2052 // ScopeHandler implementation 2053 2054 void ScopeHandler::SayAlreadyDeclared(const parser::Name &name, Symbol &prev) { 2055 SayAlreadyDeclared(name.source, prev); 2056 } 2057 void ScopeHandler::SayAlreadyDeclared(const SourceName &name, Symbol &prev) { 2058 if (context().HasError(prev)) { 2059 // don't report another error about prev 2060 } else { 2061 if (const auto *details{prev.detailsIf<UseDetails>()}) { 2062 Say(name, "'%s' is already declared in this scoping unit"_err_en_US) 2063 .Attach(details->location(), 2064 "It is use-associated with '%s' in module '%s'"_en_US, 2065 details->symbol().name(), GetUsedModule(*details).name()); 2066 } else { 2067 SayAlreadyDeclared(name, prev.name()); 2068 } 2069 context().SetError(prev); 2070 } 2071 } 2072 void ScopeHandler::SayAlreadyDeclared( 2073 const SourceName &name1, const SourceName &name2) { 2074 if (name1.begin() < name2.begin()) { 2075 SayAlreadyDeclared(name2, name1); 2076 } else { 2077 Say(name1, "'%s' is already declared in this scoping unit"_err_en_US) 2078 .Attach(name2, "Previous declaration of '%s'"_en_US, name2); 2079 } 2080 } 2081 2082 void ScopeHandler::SayWithReason(const parser::Name &name, Symbol &symbol, 2083 MessageFixedText &&msg1, Message &&msg2) { 2084 Say(name, std::move(msg1), symbol.name()).Attach(std::move(msg2)); 2085 context().SetError(symbol, msg1.isFatal()); 2086 } 2087 2088 void ScopeHandler::SayWithDecl( 2089 const parser::Name &name, Symbol &symbol, MessageFixedText &&msg) { 2090 Say(name, std::move(msg), symbol.name()) 2091 .Attach(Message{name.source, 2092 symbol.test(Symbol::Flag::Implicit) 2093 ? "Implicit declaration of '%s'"_en_US 2094 : "Declaration of '%s'"_en_US, 2095 name.source}); 2096 context().SetError(symbol, msg.isFatal()); 2097 } 2098 2099 void ScopeHandler::SayLocalMustBeVariable( 2100 const parser::Name &name, Symbol &symbol) { 2101 SayWithDecl(name, symbol, 2102 "The name '%s' must be a variable to appear" 2103 " in a locality-spec"_err_en_US); 2104 } 2105 2106 void ScopeHandler::SayDerivedType( 2107 const SourceName &name, MessageFixedText &&msg, const Scope &type) { 2108 const Symbol &typeSymbol{DEREF(type.GetSymbol())}; 2109 Say(name, std::move(msg), name, typeSymbol.name()) 2110 .Attach(typeSymbol.name(), "Declaration of derived type '%s'"_en_US, 2111 typeSymbol.name()); 2112 } 2113 void ScopeHandler::Say2(const SourceName &name1, MessageFixedText &&msg1, 2114 const SourceName &name2, MessageFixedText &&msg2) { 2115 Say(name1, std::move(msg1)).Attach(name2, std::move(msg2), name2); 2116 } 2117 void ScopeHandler::Say2(const SourceName &name, MessageFixedText &&msg1, 2118 Symbol &symbol, MessageFixedText &&msg2) { 2119 Say2(name, std::move(msg1), symbol.name(), std::move(msg2)); 2120 context().SetError(symbol, msg1.isFatal()); 2121 } 2122 void ScopeHandler::Say2(const parser::Name &name, MessageFixedText &&msg1, 2123 Symbol &symbol, MessageFixedText &&msg2) { 2124 Say2(name.source, std::move(msg1), symbol.name(), std::move(msg2)); 2125 context().SetError(symbol, msg1.isFatal()); 2126 } 2127 2128 // This is essentially GetProgramUnitContaining(), but it can return 2129 // a mutable Scope &, it ignores statement functions, and it fails 2130 // gracefully for error recovery (returning the original Scope). 2131 template <typename T> static T &GetInclusiveScope(T &scope) { 2132 for (T *s{&scope}; !s->IsGlobal(); s = &s->parent()) { 2133 switch (s->kind()) { 2134 case Scope::Kind::Module: 2135 case Scope::Kind::MainProgram: 2136 case Scope::Kind::Subprogram: 2137 case Scope::Kind::BlockData: 2138 if (!s->IsStmtFunction()) { 2139 return *s; 2140 } 2141 break; 2142 default:; 2143 } 2144 } 2145 return scope; 2146 } 2147 2148 Scope &ScopeHandler::InclusiveScope() { return GetInclusiveScope(currScope()); } 2149 2150 Scope *ScopeHandler::GetHostProcedure() { 2151 Scope &parent{InclusiveScope().parent()}; 2152 switch (parent.kind()) { 2153 case Scope::Kind::Subprogram: 2154 return &parent; 2155 case Scope::Kind::MainProgram: 2156 return &parent; 2157 default: 2158 return nullptr; 2159 } 2160 } 2161 2162 Scope &ScopeHandler::NonDerivedTypeScope() { 2163 return currScope_->IsDerivedType() ? currScope_->parent() : *currScope_; 2164 } 2165 2166 void ScopeHandler::PushScope(Scope::Kind kind, Symbol *symbol) { 2167 PushScope(currScope().MakeScope(kind, symbol)); 2168 } 2169 void ScopeHandler::PushScope(Scope &scope) { 2170 currScope_ = &scope; 2171 auto kind{currScope_->kind()}; 2172 if (kind != Scope::Kind::Block) { 2173 BeginScope(scope); 2174 } 2175 // The name of a module or submodule cannot be "used" in its scope, 2176 // as we read 19.3.1(2), so we allow the name to be used as a local 2177 // identifier in the module or submodule too. Same with programs 2178 // (14.1(3)) and BLOCK DATA. 2179 if (!currScope_->IsDerivedType() && kind != Scope::Kind::Module && 2180 kind != Scope::Kind::MainProgram && kind != Scope::Kind::BlockData) { 2181 if (auto *symbol{scope.symbol()}) { 2182 // Create a dummy symbol so we can't create another one with the same 2183 // name. It might already be there if we previously pushed the scope. 2184 SourceName name{symbol->name()}; 2185 if (!FindInScope(scope, name)) { 2186 auto &newSymbol{MakeSymbol(name)}; 2187 if (kind == Scope::Kind::Subprogram) { 2188 // Allow for recursive references. If this symbol is a function 2189 // without an explicit RESULT(), this new symbol will be discarded 2190 // and replaced with an object of the same name. 2191 newSymbol.set_details(HostAssocDetails{*symbol}); 2192 } else { 2193 newSymbol.set_details(MiscDetails{MiscDetails::Kind::ScopeName}); 2194 } 2195 } 2196 } 2197 } 2198 } 2199 void ScopeHandler::PopScope() { 2200 // Entities that are not yet classified as objects or procedures are now 2201 // assumed to be objects. 2202 // TODO: Statement functions 2203 for (auto &pair : currScope()) { 2204 ConvertToObjectEntity(*pair.second); 2205 } 2206 // If popping back into a global scope, pop back to the main global scope. 2207 SetScope(currScope_->parent().IsGlobal() ? context().globalScope() 2208 : currScope_->parent()); 2209 } 2210 void ScopeHandler::SetScope(Scope &scope) { 2211 currScope_ = &scope; 2212 ImplicitRulesVisitor::SetScope(InclusiveScope()); 2213 } 2214 2215 Symbol *ScopeHandler::FindSymbol(const parser::Name &name) { 2216 return FindSymbol(currScope(), name); 2217 } 2218 Symbol *ScopeHandler::FindSymbol(const Scope &scope, const parser::Name &name) { 2219 if (scope.IsDerivedType()) { 2220 if (Symbol * symbol{scope.FindComponent(name.source)}) { 2221 if (!symbol->has<ProcBindingDetails>() && 2222 !symbol->test(Symbol::Flag::ParentComp)) { 2223 return Resolve(name, symbol); 2224 } 2225 } 2226 return FindSymbol(scope.parent(), name); 2227 } else { 2228 // In EQUIVALENCE statements only resolve names in the local scope, see 2229 // 19.5.1.4, paragraph 2, item (10) 2230 return Resolve(name, 2231 inEquivalenceStmt_ ? FindInScope(scope, name) 2232 : scope.FindSymbol(name.source)); 2233 } 2234 } 2235 2236 Symbol &ScopeHandler::MakeSymbol( 2237 Scope &scope, const SourceName &name, Attrs attrs) { 2238 if (Symbol * symbol{FindInScope(scope, name)}) { 2239 symbol->attrs() |= attrs; 2240 return *symbol; 2241 } else { 2242 const auto pair{scope.try_emplace(name, attrs, UnknownDetails{})}; 2243 CHECK(pair.second); // name was not found, so must be able to add 2244 return *pair.first->second; 2245 } 2246 } 2247 Symbol &ScopeHandler::MakeSymbol(const SourceName &name, Attrs attrs) { 2248 return MakeSymbol(currScope(), name, attrs); 2249 } 2250 Symbol &ScopeHandler::MakeSymbol(const parser::Name &name, Attrs attrs) { 2251 return Resolve(name, MakeSymbol(name.source, attrs)); 2252 } 2253 Symbol &ScopeHandler::MakeHostAssocSymbol( 2254 const parser::Name &name, const Symbol &hostSymbol) { 2255 Symbol &symbol{*NonDerivedTypeScope() 2256 .try_emplace(name.source, HostAssocDetails{hostSymbol}) 2257 .first->second}; 2258 name.symbol = &symbol; 2259 symbol.attrs() = hostSymbol.attrs(); // TODO: except PRIVATE, PUBLIC? 2260 symbol.flags() = hostSymbol.flags(); 2261 return symbol; 2262 } 2263 Symbol &ScopeHandler::CopySymbol(const SourceName &name, const Symbol &symbol) { 2264 CHECK(!FindInScope(name)); 2265 return MakeSymbol(currScope(), name, symbol.attrs()); 2266 } 2267 2268 // Look for name only in scope, not in enclosing scopes. 2269 Symbol *ScopeHandler::FindInScope( 2270 const Scope &scope, const parser::Name &name) { 2271 return Resolve(name, FindInScope(scope, name.source)); 2272 } 2273 Symbol *ScopeHandler::FindInScope(const Scope &scope, const SourceName &name) { 2274 // all variants of names, e.g. "operator(.ne.)" for "operator(/=)" 2275 for (const std::string &n : GetAllNames(context(), name)) { 2276 auto it{scope.find(SourceName{n})}; 2277 if (it != scope.end()) { 2278 return &*it->second; 2279 } 2280 } 2281 return nullptr; 2282 } 2283 2284 // Find a component or type parameter by name in a derived type or its parents. 2285 Symbol *ScopeHandler::FindInTypeOrParents( 2286 const Scope &scope, const parser::Name &name) { 2287 return Resolve(name, scope.FindComponent(name.source)); 2288 } 2289 Symbol *ScopeHandler::FindInTypeOrParents(const parser::Name &name) { 2290 return FindInTypeOrParents(currScope(), name); 2291 } 2292 2293 void ScopeHandler::EraseSymbol(const parser::Name &name) { 2294 currScope().erase(name.source); 2295 name.symbol = nullptr; 2296 } 2297 2298 static bool NeedsType(const Symbol &symbol) { 2299 return !symbol.GetType() && 2300 common::visit(common::visitors{ 2301 [](const EntityDetails &) { return true; }, 2302 [](const ObjectEntityDetails &) { return true; }, 2303 [](const AssocEntityDetails &) { return true; }, 2304 [&](const ProcEntityDetails &p) { 2305 return symbol.test(Symbol::Flag::Function) && 2306 !symbol.attrs().test(Attr::INTRINSIC) && 2307 !p.interface().type() && !p.interface().symbol(); 2308 }, 2309 [](const auto &) { return false; }, 2310 }, 2311 symbol.details()); 2312 } 2313 2314 void ScopeHandler::ApplyImplicitRules( 2315 Symbol &symbol, bool allowForwardReference) { 2316 funcResultStack_.CompleteTypeIfFunctionResult(symbol); 2317 if (context().HasError(symbol) || !NeedsType(symbol)) { 2318 return; 2319 } 2320 if (const DeclTypeSpec * type{GetImplicitType(symbol)}) { 2321 symbol.set(Symbol::Flag::Implicit); 2322 symbol.SetType(*type); 2323 return; 2324 } 2325 if (symbol.has<ProcEntityDetails>() && !symbol.attrs().test(Attr::EXTERNAL)) { 2326 std::optional<Symbol::Flag> functionOrSubroutineFlag; 2327 if (symbol.test(Symbol::Flag::Function)) { 2328 functionOrSubroutineFlag = Symbol::Flag::Function; 2329 } else if (symbol.test(Symbol::Flag::Subroutine)) { 2330 functionOrSubroutineFlag = Symbol::Flag::Subroutine; 2331 } 2332 if (IsIntrinsic(symbol.name(), functionOrSubroutineFlag)) { 2333 // type will be determined in expression semantics 2334 AcquireIntrinsicProcedureFlags(symbol); 2335 return; 2336 } 2337 } 2338 if (allowForwardReference && ImplicitlyTypeForwardRef(symbol)) { 2339 return; 2340 } 2341 if (!context().HasError(symbol)) { 2342 Say(symbol.name(), "No explicit type declared for '%s'"_err_en_US); 2343 context().SetError(symbol); 2344 } 2345 } 2346 2347 // Extension: Allow forward references to scalar integer dummy arguments 2348 // to appear in specification expressions under IMPLICIT NONE(TYPE) when 2349 // what would otherwise have been their implicit type is default INTEGER. 2350 bool ScopeHandler::ImplicitlyTypeForwardRef(Symbol &symbol) { 2351 if (!inSpecificationPart_ || context().HasError(symbol) || !IsDummy(symbol) || 2352 symbol.Rank() != 0 || 2353 !context().languageFeatures().IsEnabled( 2354 common::LanguageFeature::ForwardRefDummyImplicitNone)) { 2355 return false; 2356 } 2357 const DeclTypeSpec *type{ 2358 GetImplicitType(symbol, false /*ignore IMPLICIT NONE*/)}; 2359 if (!type || !type->IsNumeric(TypeCategory::Integer)) { 2360 return false; 2361 } 2362 auto kind{evaluate::ToInt64(type->numericTypeSpec().kind())}; 2363 if (!kind || *kind != context().GetDefaultKind(TypeCategory::Integer)) { 2364 return false; 2365 } 2366 if (!ConvertToObjectEntity(symbol)) { 2367 return false; 2368 } 2369 // TODO: check no INTENT(OUT)? 2370 if (context().languageFeatures().ShouldWarn( 2371 common::LanguageFeature::ForwardRefDummyImplicitNone)) { 2372 Say(symbol.name(), 2373 "Dummy argument '%s' was used without being explicitly typed"_warn_en_US, 2374 symbol.name()); 2375 } 2376 symbol.set(Symbol::Flag::Implicit); 2377 symbol.SetType(*type); 2378 return true; 2379 } 2380 2381 // Ensure that the symbol for an intrinsic procedure is marked with 2382 // the INTRINSIC attribute. Also set PURE &/or ELEMENTAL as 2383 // appropriate. 2384 void ScopeHandler::AcquireIntrinsicProcedureFlags(Symbol &symbol) { 2385 symbol.attrs().set(Attr::INTRINSIC); 2386 switch (context().intrinsics().GetIntrinsicClass(symbol.name().ToString())) { 2387 case evaluate::IntrinsicClass::elementalFunction: 2388 case evaluate::IntrinsicClass::elementalSubroutine: 2389 symbol.attrs().set(Attr::ELEMENTAL); 2390 symbol.attrs().set(Attr::PURE); 2391 break; 2392 case evaluate::IntrinsicClass::impureSubroutine: 2393 break; 2394 default: 2395 symbol.attrs().set(Attr::PURE); 2396 } 2397 } 2398 2399 const DeclTypeSpec *ScopeHandler::GetImplicitType( 2400 Symbol &symbol, bool respectImplicitNoneType) { 2401 const Scope *scope{&symbol.owner()}; 2402 if (scope->IsGlobal()) { 2403 scope = &currScope(); 2404 } 2405 scope = &GetInclusiveScope(*scope); 2406 const auto *type{implicitRulesMap_->at(scope).GetType( 2407 symbol.name(), respectImplicitNoneType)}; 2408 if (type) { 2409 if (const DerivedTypeSpec * derived{type->AsDerived()}) { 2410 // Resolve any forward-referenced derived type; a quick no-op else. 2411 auto &instantiatable{*const_cast<DerivedTypeSpec *>(derived)}; 2412 instantiatable.Instantiate(currScope()); 2413 } 2414 } 2415 return type; 2416 } 2417 2418 // Convert symbol to be a ObjectEntity or return false if it can't be. 2419 bool ScopeHandler::ConvertToObjectEntity(Symbol &symbol) { 2420 if (symbol.has<ObjectEntityDetails>()) { 2421 // nothing to do 2422 } else if (symbol.has<UnknownDetails>()) { 2423 symbol.set_details(ObjectEntityDetails{}); 2424 } else if (auto *details{symbol.detailsIf<EntityDetails>()}) { 2425 funcResultStack_.CompleteTypeIfFunctionResult(symbol); 2426 symbol.set_details(ObjectEntityDetails{std::move(*details)}); 2427 } else if (auto *useDetails{symbol.detailsIf<UseDetails>()}) { 2428 return useDetails->symbol().has<ObjectEntityDetails>(); 2429 } else if (auto *hostDetails{symbol.detailsIf<HostAssocDetails>()}) { 2430 return hostDetails->symbol().has<ObjectEntityDetails>(); 2431 } else { 2432 return false; 2433 } 2434 return true; 2435 } 2436 // Convert symbol to be a ProcEntity or return false if it can't be. 2437 bool ScopeHandler::ConvertToProcEntity(Symbol &symbol) { 2438 if (symbol.has<ProcEntityDetails>()) { 2439 // nothing to do 2440 } else if (symbol.has<UnknownDetails>()) { 2441 symbol.set_details(ProcEntityDetails{}); 2442 } else if (auto *details{symbol.detailsIf<EntityDetails>()}) { 2443 funcResultStack_.CompleteTypeIfFunctionResult(symbol); 2444 symbol.set_details(ProcEntityDetails{std::move(*details)}); 2445 if (symbol.GetType() && !symbol.test(Symbol::Flag::Implicit)) { 2446 CHECK(!symbol.test(Symbol::Flag::Subroutine)); 2447 symbol.set(Symbol::Flag::Function); 2448 } 2449 } else if (auto *useDetails{symbol.detailsIf<UseDetails>()}) { 2450 return useDetails->symbol().has<ProcEntityDetails>(); 2451 } else if (auto *hostDetails{symbol.detailsIf<HostAssocDetails>()}) { 2452 return hostDetails->symbol().has<ProcEntityDetails>(); 2453 } else { 2454 return false; 2455 } 2456 return true; 2457 } 2458 2459 const DeclTypeSpec &ScopeHandler::MakeNumericType( 2460 TypeCategory category, const std::optional<parser::KindSelector> &kind) { 2461 KindExpr value{GetKindParamExpr(category, kind)}; 2462 if (auto known{evaluate::ToInt64(value)}) { 2463 return context().MakeNumericType(category, static_cast<int>(*known)); 2464 } else { 2465 return currScope_->MakeNumericType(category, std::move(value)); 2466 } 2467 } 2468 2469 const DeclTypeSpec &ScopeHandler::MakeLogicalType( 2470 const std::optional<parser::KindSelector> &kind) { 2471 KindExpr value{GetKindParamExpr(TypeCategory::Logical, kind)}; 2472 if (auto known{evaluate::ToInt64(value)}) { 2473 return context().MakeLogicalType(static_cast<int>(*known)); 2474 } else { 2475 return currScope_->MakeLogicalType(std::move(value)); 2476 } 2477 } 2478 2479 void ScopeHandler::NotePossibleBadForwardRef(const parser::Name &name) { 2480 if (inSpecificationPart_ && name.symbol) { 2481 auto kind{currScope().kind()}; 2482 if ((kind == Scope::Kind::Subprogram && !currScope().IsStmtFunction()) || 2483 kind == Scope::Kind::Block) { 2484 bool isHostAssociated{&name.symbol->owner() == &currScope() 2485 ? name.symbol->has<HostAssocDetails>() 2486 : name.symbol->owner().Contains(currScope())}; 2487 if (isHostAssociated) { 2488 specPartState_.forwardRefs.insert(name.source); 2489 } 2490 } 2491 } 2492 } 2493 2494 std::optional<SourceName> ScopeHandler::HadForwardRef( 2495 const Symbol &symbol) const { 2496 auto iter{specPartState_.forwardRefs.find(symbol.name())}; 2497 if (iter != specPartState_.forwardRefs.end()) { 2498 return *iter; 2499 } 2500 return std::nullopt; 2501 } 2502 2503 bool ScopeHandler::CheckPossibleBadForwardRef(const Symbol &symbol) { 2504 if (!context().HasError(symbol)) { 2505 if (auto fwdRef{HadForwardRef(symbol)}) { 2506 const Symbol *outer{symbol.owner().FindSymbol(symbol.name())}; 2507 if (outer && symbol.has<UseDetails>() && 2508 &symbol.GetUltimate() == &outer->GetUltimate()) { 2509 // e.g. IMPORT of host's USE association 2510 return false; 2511 } 2512 Say(*fwdRef, 2513 "Forward reference to '%s' is not allowed in the same specification part"_err_en_US, 2514 *fwdRef) 2515 .Attach(symbol.name(), "Later declaration of '%s'"_en_US, *fwdRef); 2516 context().SetError(symbol); 2517 return true; 2518 } 2519 if (IsDummy(symbol) && isImplicitNoneType() && 2520 symbol.test(Symbol::Flag::Implicit) && !context().HasError(symbol)) { 2521 // Dummy was implicitly typed despite IMPLICIT NONE(TYPE) in 2522 // ApplyImplicitRules() due to use in a specification expression, 2523 // and no explicit type declaration appeared later. 2524 Say(symbol.name(), 2525 "No explicit type declared for dummy argument '%s'"_err_en_US); 2526 context().SetError(symbol); 2527 return true; 2528 } 2529 } 2530 return false; 2531 } 2532 2533 void ScopeHandler::MakeExternal(Symbol &symbol) { 2534 if (!symbol.attrs().test(Attr::EXTERNAL)) { 2535 symbol.attrs().set(Attr::EXTERNAL); 2536 if (symbol.attrs().test(Attr::INTRINSIC)) { // C840 2537 Say(symbol.name(), 2538 "Symbol '%s' cannot have both EXTERNAL and INTRINSIC attributes"_err_en_US, 2539 symbol.name()); 2540 } 2541 } 2542 } 2543 2544 // ModuleVisitor implementation 2545 2546 bool ModuleVisitor::Pre(const parser::Only &x) { 2547 common::visit(common::visitors{ 2548 [&](const Indirection<parser::GenericSpec> &generic) { 2549 GenericSpecInfo genericSpecInfo{generic.value()}; 2550 AddUseOnly(genericSpecInfo.symbolName()); 2551 AddUse(genericSpecInfo); 2552 }, 2553 [&](const parser::Name &name) { 2554 AddUseOnly(name.source); 2555 Resolve(name, AddUse(name.source, name.source).use); 2556 }, 2557 [&](const parser::Rename &rename) { Walk(rename); }, 2558 }, 2559 x.u); 2560 return false; 2561 } 2562 2563 bool ModuleVisitor::Pre(const parser::Rename::Names &x) { 2564 const auto &localName{std::get<0>(x.t)}; 2565 const auto &useName{std::get<1>(x.t)}; 2566 AddUseRename(useName.source); 2567 SymbolRename rename{AddUse(localName.source, useName.source)}; 2568 if (rename.use) { 2569 EraseRenamedSymbol(*rename.use); 2570 } 2571 Resolve(useName, rename.use); 2572 Resolve(localName, rename.local); 2573 return false; 2574 } 2575 bool ModuleVisitor::Pre(const parser::Rename::Operators &x) { 2576 const parser::DefinedOpName &local{std::get<0>(x.t)}; 2577 const parser::DefinedOpName &use{std::get<1>(x.t)}; 2578 GenericSpecInfo localInfo{local}; 2579 GenericSpecInfo useInfo{use}; 2580 if (IsIntrinsicOperator(context(), local.v.source)) { 2581 Say(local.v, 2582 "Intrinsic operator '%s' may not be used as a defined operator"_err_en_US); 2583 } else if (IsLogicalConstant(context(), local.v.source)) { 2584 Say(local.v, 2585 "Logical constant '%s' may not be used as a defined operator"_err_en_US); 2586 } else { 2587 SymbolRename rename{AddUse(localInfo.symbolName(), useInfo.symbolName())}; 2588 if (rename.use) { 2589 EraseRenamedSymbol(*rename.use); 2590 } 2591 useInfo.Resolve(rename.use); 2592 localInfo.Resolve(rename.local); 2593 } 2594 return false; 2595 } 2596 2597 // Set useModuleScope_ to the Scope of the module being used. 2598 bool ModuleVisitor::Pre(const parser::UseStmt &x) { 2599 std::optional<bool> isIntrinsic; 2600 if (x.nature) { 2601 isIntrinsic = *x.nature == parser::UseStmt::ModuleNature::Intrinsic; 2602 AddAndCheckExplicitIntrinsicUse(x.moduleName.source, *isIntrinsic); 2603 } else if (currScope().IsModule() && currScope().symbol() && 2604 currScope().symbol()->attrs().test(Attr::INTRINSIC)) { 2605 // Intrinsic modules USE only other intrinsic modules 2606 isIntrinsic = true; 2607 } 2608 useModuleScope_ = FindModule(x.moduleName, isIntrinsic); 2609 if (!useModuleScope_) { 2610 return false; 2611 } 2612 // use the name from this source file 2613 useModuleScope_->symbol()->ReplaceName(x.moduleName.source); 2614 return true; 2615 } 2616 2617 void ModuleVisitor::Post(const parser::UseStmt &x) { 2618 if (const auto *list{std::get_if<std::list<parser::Rename>>(&x.u)}) { 2619 // Not a use-only: collect the names that were used in renames, 2620 // then add a use for each public name that was not renamed. 2621 std::set<SourceName> useNames; 2622 for (const auto &rename : *list) { 2623 common::visit(common::visitors{ 2624 [&](const parser::Rename::Names &names) { 2625 useNames.insert(std::get<1>(names.t).source); 2626 }, 2627 [&](const parser::Rename::Operators &ops) { 2628 useNames.insert(std::get<1>(ops.t).v.source); 2629 }, 2630 }, 2631 rename.u); 2632 } 2633 for (const auto &[name, symbol] : *useModuleScope_) { 2634 if (symbol->attrs().test(Attr::PUBLIC) && !IsUseRenamed(symbol->name()) && 2635 (!symbol->attrs().test(Attr::INTRINSIC) || 2636 symbol->has<UseDetails>()) && 2637 !symbol->has<MiscDetails>() && useNames.count(name) == 0) { 2638 SourceName location{x.moduleName.source}; 2639 if (auto *localSymbol{FindInScope(name)}) { 2640 DoAddUse(location, localSymbol->name(), *localSymbol, *symbol); 2641 } else { 2642 DoAddUse(location, location, CopySymbol(name, *symbol), *symbol); 2643 } 2644 } 2645 } 2646 } 2647 useModuleScope_ = nullptr; 2648 } 2649 2650 ModuleVisitor::SymbolRename ModuleVisitor::AddUse( 2651 const SourceName &localName, const SourceName &useName) { 2652 return AddUse(localName, useName, FindInScope(*useModuleScope_, useName)); 2653 } 2654 2655 ModuleVisitor::SymbolRename ModuleVisitor::AddUse( 2656 const SourceName &localName, const SourceName &useName, Symbol *useSymbol) { 2657 if (!useModuleScope_) { 2658 return {}; // error occurred finding module 2659 } 2660 if (!useSymbol) { 2661 Say(useName, "'%s' not found in module '%s'"_err_en_US, MakeOpName(useName), 2662 useModuleScope_->GetName().value()); 2663 return {}; 2664 } 2665 if (useSymbol->attrs().test(Attr::PRIVATE) && 2666 !FindModuleFileContaining(currScope())) { 2667 // Privacy is not enforced in module files so that generic interfaces 2668 // can be resolved to private specific procedures in specification 2669 // expressions. 2670 Say(useName, "'%s' is PRIVATE in '%s'"_err_en_US, MakeOpName(useName), 2671 useModuleScope_->GetName().value()); 2672 return {}; 2673 } 2674 auto &localSymbol{MakeSymbol(localName)}; 2675 DoAddUse(useName, localName, localSymbol, *useSymbol); 2676 return {&localSymbol, useSymbol}; 2677 } 2678 2679 // symbol must be either a Use or a Generic formed by merging two uses. 2680 // Convert it to a UseError with this additional location. 2681 static void ConvertToUseError( 2682 Symbol &symbol, const SourceName &location, const Scope &module) { 2683 const auto *useDetails{symbol.detailsIf<UseDetails>()}; 2684 if (!useDetails) { 2685 auto &genericDetails{symbol.get<GenericDetails>()}; 2686 useDetails = &genericDetails.uses().at(0)->get<UseDetails>(); 2687 } 2688 symbol.set_details( 2689 UseErrorDetails{*useDetails}.add_occurrence(location, module)); 2690 } 2691 2692 // If a symbol has previously been USE-associated and did not appear in a USE 2693 // ONLY clause, erase it from the current scope. This is needed when a name 2694 // appears in a USE rename clause. 2695 void ModuleVisitor::EraseRenamedSymbol(const Symbol &useSymbol) { 2696 const SourceName &name{useSymbol.name()}; 2697 if (const Symbol * symbol{FindInScope(name)}) { 2698 if (auto *useDetails{symbol->detailsIf<UseDetails>()}) { 2699 const Symbol &moduleSymbol{useDetails->symbol()}; 2700 if (moduleSymbol.name() == name && 2701 moduleSymbol.owner() == useSymbol.owner() && IsUseRenamed(name) && 2702 !IsUseOnly(name)) { 2703 EraseSymbol(*symbol); 2704 } 2705 } 2706 } 2707 } 2708 2709 void ModuleVisitor::DoAddUse(SourceName location, SourceName localName, 2710 Symbol &localSymbol, const Symbol &useSymbol) { 2711 if (localName != useSymbol.name()) { 2712 EraseRenamedSymbol(useSymbol); 2713 } 2714 if (auto *details{localSymbol.detailsIf<UseErrorDetails>()}) { 2715 details->add_occurrence(location, *useModuleScope_); 2716 return; 2717 } 2718 2719 if (localSymbol.has<UnknownDetails>()) { 2720 localSymbol.set_details(UseDetails{localName, useSymbol}); 2721 localSymbol.attrs() = 2722 useSymbol.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}; 2723 localSymbol.flags() = useSymbol.flags(); 2724 return; 2725 } 2726 2727 Symbol &localUltimate{localSymbol.GetUltimate()}; 2728 const Symbol &useUltimate{useSymbol.GetUltimate()}; 2729 if (&localUltimate == &useUltimate) { 2730 // use-associating the same symbol again -- ok 2731 return; 2732 } 2733 2734 auto checkAmbiguousDerivedType{[this, location, localName]( 2735 const Symbol *t1, const Symbol *t2) { 2736 if (!t1 || !t2) { 2737 return true; 2738 } else { 2739 t1 = &t1->GetUltimate(); 2740 t2 = &t2->GetUltimate(); 2741 if (&t1 != &t2) { 2742 Say(location, 2743 "Generic interface '%s' has ambiguous derived types from modules '%s' and '%s'"_err_en_US, 2744 localName, t1->owner().GetName().value(), 2745 t2->owner().GetName().value()); 2746 return false; 2747 } 2748 } 2749 }}; 2750 2751 auto *localGeneric{localUltimate.detailsIf<GenericDetails>()}; 2752 const auto *useGeneric{useUltimate.detailsIf<GenericDetails>()}; 2753 auto combine{false}; 2754 if (localGeneric) { 2755 if (useGeneric) { 2756 if (!checkAmbiguousDerivedType( 2757 localGeneric->derivedType(), useGeneric->derivedType())) { 2758 return; 2759 } 2760 combine = true; 2761 } else if (useUltimate.has<DerivedTypeDetails>()) { 2762 if (checkAmbiguousDerivedType( 2763 &useUltimate, localGeneric->derivedType())) { 2764 combine = true; 2765 } else { 2766 return; 2767 } 2768 } else if (&useUltimate == &BypassGeneric(localUltimate)) { 2769 return; // nothing to do; used subprogram is local's specific 2770 } 2771 } else if (useGeneric) { 2772 if (localUltimate.has<DerivedTypeDetails>()) { 2773 if (checkAmbiguousDerivedType( 2774 &localUltimate, useGeneric->derivedType())) { 2775 combine = true; 2776 } else { 2777 return; 2778 } 2779 } else if (&localUltimate == &BypassGeneric(useUltimate).GetUltimate()) { 2780 // Local is the specific of the used generic; replace it. 2781 EraseSymbol(localSymbol); 2782 Symbol &newSymbol{MakeSymbol(localName, 2783 useUltimate.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}, 2784 UseDetails{localName, useUltimate})}; 2785 newSymbol.flags() = useSymbol.flags(); 2786 return; 2787 } 2788 } 2789 if (!combine) { 2790 if (localSymbol.has<UseDetails>() || localSymbol.has<GenericDetails>()) { 2791 ConvertToUseError(localSymbol, location, *useModuleScope_); 2792 } else { 2793 Say(location, 2794 "Cannot use-associate '%s'; it is already declared in this scope"_err_en_US, 2795 localName) 2796 .Attach(localSymbol.name(), "Previous declaration of '%s'"_en_US, 2797 localName); 2798 } 2799 return; 2800 } 2801 2802 // Two items are being use-associated from different modules 2803 // to the same local name. At least one of them must be a generic, 2804 // and the other one can be a generic or a derived type. 2805 // (It could also have been the specific of the generic, but those 2806 // cases are handled above without needing to make a local copy of the 2807 // generic.) 2808 2809 if (localGeneric) { 2810 if (localSymbol.has<UseDetails>()) { 2811 // Create a local copy of a previously use-associated generic so that 2812 // it can be locally extended without corrupting the original. 2813 GenericDetails generic; 2814 generic.CopyFrom(*localGeneric); 2815 EraseSymbol(localSymbol); 2816 Symbol &newSymbol{MakeSymbol( 2817 localSymbol.name(), localSymbol.attrs(), std::move(generic))}; 2818 newSymbol.flags() = localSymbol.flags(); 2819 localGeneric = &newSymbol.get<GenericDetails>(); 2820 localGeneric->AddUse(localSymbol); 2821 } 2822 if (useGeneric) { 2823 // Combine two use-associated generics 2824 localSymbol.attrs() = 2825 useSymbol.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}; 2826 localSymbol.flags() = useSymbol.flags(); 2827 AddGenericUse(*localGeneric, localName, useUltimate); 2828 localGeneric->CopyFrom(*useGeneric); 2829 } else { 2830 CHECK(useUltimate.has<DerivedTypeDetails>()); 2831 localGeneric->set_derivedType( 2832 AddGenericUse(*localGeneric, localName, useUltimate)); 2833 } 2834 } else { 2835 CHECK(useGeneric && localUltimate.has<DerivedTypeDetails>()); 2836 CHECK(localSymbol.has<UseDetails>()); 2837 // Create a local copy of the use-associated generic, then extend it 2838 // with the local derived type. 2839 GenericDetails generic; 2840 generic.CopyFrom(*useGeneric); 2841 EraseSymbol(localSymbol); 2842 Symbol &newSymbol{MakeSymbol(localName, 2843 useUltimate.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}, 2844 std::move(generic))}; 2845 newSymbol.flags() = useUltimate.flags(); 2846 auto &newUseGeneric{newSymbol.get<GenericDetails>()}; 2847 AddGenericUse(newUseGeneric, localName, useUltimate); 2848 newUseGeneric.AddUse(localSymbol); 2849 newUseGeneric.set_derivedType(localSymbol); 2850 } 2851 } 2852 2853 void ModuleVisitor::AddUse(const GenericSpecInfo &info) { 2854 if (useModuleScope_) { 2855 const auto &name{info.symbolName()}; 2856 auto rename{AddUse(name, name, FindInScope(*useModuleScope_, name))}; 2857 info.Resolve(rename.use); 2858 } 2859 } 2860 2861 // Create a UseDetails symbol for this USE and add it to generic 2862 Symbol &ModuleVisitor::AddGenericUse( 2863 GenericDetails &generic, const SourceName &name, const Symbol &useSymbol) { 2864 Symbol &newSymbol{ 2865 currScope().MakeSymbol(name, {}, UseDetails{name, useSymbol})}; 2866 generic.AddUse(newSymbol); 2867 return newSymbol; 2868 } 2869 2870 // Enforce C1406 2871 void ModuleVisitor::AddAndCheckExplicitIntrinsicUse( 2872 SourceName name, bool isIntrinsic) { 2873 if (isIntrinsic) { 2874 if (auto iter{explicitNonIntrinsicUses_.find(name)}; 2875 iter != explicitNonIntrinsicUses_.end()) { 2876 Say(name, 2877 "Cannot USE,INTRINSIC module '%s' in the same scope as USE,NON_INTRINSIC"_err_en_US, 2878 name) 2879 .Attach(*iter, "Previous USE of '%s'"_en_US, *iter); 2880 } 2881 explicitIntrinsicUses_.insert(name); 2882 } else { 2883 if (auto iter{explicitIntrinsicUses_.find(name)}; 2884 iter != explicitIntrinsicUses_.end()) { 2885 Say(name, 2886 "Cannot USE,NON_INTRINSIC module '%s' in the same scope as USE,INTRINSIC"_err_en_US, 2887 name) 2888 .Attach(*iter, "Previous USE of '%s'"_en_US, *iter); 2889 } 2890 explicitNonIntrinsicUses_.insert(name); 2891 } 2892 } 2893 2894 bool ModuleVisitor::BeginSubmodule( 2895 const parser::Name &name, const parser::ParentIdentifier &parentId) { 2896 auto &ancestorName{std::get<parser::Name>(parentId.t)}; 2897 auto &parentName{std::get<std::optional<parser::Name>>(parentId.t)}; 2898 Scope *ancestor{FindModule(ancestorName, false /*not intrinsic*/)}; 2899 if (!ancestor) { 2900 return false; 2901 } 2902 Scope *parentScope{parentName 2903 ? FindModule(*parentName, false /*not intrinsic*/, ancestor) 2904 : ancestor}; 2905 if (!parentScope) { 2906 return false; 2907 } 2908 PushScope(*parentScope); // submodule is hosted in parent 2909 BeginModule(name, true); 2910 if (!ancestor->AddSubmodule(name.source, currScope())) { 2911 Say(name, "Module '%s' already has a submodule named '%s'"_err_en_US, 2912 ancestorName.source, name.source); 2913 } 2914 return true; 2915 } 2916 2917 void ModuleVisitor::BeginModule(const parser::Name &name, bool isSubmodule) { 2918 auto &symbol{MakeSymbol(name, ModuleDetails{isSubmodule})}; 2919 auto &details{symbol.get<ModuleDetails>()}; 2920 PushScope(Scope::Kind::Module, &symbol); 2921 details.set_scope(&currScope()); 2922 defaultAccess_ = Attr::PUBLIC; 2923 prevAccessStmt_ = std::nullopt; 2924 } 2925 2926 // Find a module or submodule by name and return its scope. 2927 // If ancestor is present, look for a submodule of that ancestor module. 2928 // May have to read a .mod file to find it. 2929 // If an error occurs, report it and return nullptr. 2930 Scope *ModuleVisitor::FindModule(const parser::Name &name, 2931 std::optional<bool> isIntrinsic, Scope *ancestor) { 2932 ModFileReader reader{context()}; 2933 Scope *scope{reader.Read(name.source, isIntrinsic, ancestor)}; 2934 if (!scope) { 2935 return nullptr; 2936 } 2937 if (scope->kind() != Scope::Kind::Module) { 2938 Say(name, "'%s' is not a module"_err_en_US); 2939 return nullptr; 2940 } 2941 if (DoesScopeContain(scope, currScope())) { // 14.2.2(1) 2942 Say(name, "Module '%s' cannot USE itself"_err_en_US); 2943 } 2944 Resolve(name, scope->symbol()); 2945 return scope; 2946 } 2947 2948 void ModuleVisitor::ApplyDefaultAccess() { 2949 for (auto &pair : currScope()) { 2950 Symbol &symbol = *pair.second; 2951 if (!symbol.attrs().HasAny({Attr::PUBLIC, Attr::PRIVATE})) { 2952 symbol.attrs().set(defaultAccess_); 2953 } 2954 } 2955 } 2956 2957 // InterfaceVistor implementation 2958 2959 bool InterfaceVisitor::Pre(const parser::InterfaceStmt &x) { 2960 bool isAbstract{std::holds_alternative<parser::Abstract>(x.u)}; 2961 genericInfo_.emplace(/*isInterface*/ true, isAbstract); 2962 return BeginAttrs(); 2963 } 2964 2965 void InterfaceVisitor::Post(const parser::InterfaceStmt &) { EndAttrs(); } 2966 2967 void InterfaceVisitor::Post(const parser::EndInterfaceStmt &) { 2968 genericInfo_.pop(); 2969 } 2970 2971 // Create a symbol in genericSymbol_ for this GenericSpec. 2972 bool InterfaceVisitor::Pre(const parser::GenericSpec &x) { 2973 if (auto *symbol{FindInScope(GenericSpecInfo{x}.symbolName())}) { 2974 SetGenericSymbol(*symbol); 2975 } 2976 return false; 2977 } 2978 2979 bool InterfaceVisitor::Pre(const parser::ProcedureStmt &x) { 2980 if (!isGeneric()) { 2981 Say("A PROCEDURE statement is only allowed in a generic interface block"_err_en_US); 2982 return false; 2983 } 2984 auto kind{std::get<parser::ProcedureStmt::Kind>(x.t)}; 2985 const auto &names{std::get<std::list<parser::Name>>(x.t)}; 2986 AddSpecificProcs(names, kind); 2987 return false; 2988 } 2989 2990 bool InterfaceVisitor::Pre(const parser::GenericStmt &) { 2991 genericInfo_.emplace(/*isInterface*/ false); 2992 return true; 2993 } 2994 void InterfaceVisitor::Post(const parser::GenericStmt &x) { 2995 if (auto &accessSpec{std::get<std::optional<parser::AccessSpec>>(x.t)}) { 2996 GetGenericInfo().symbol->attrs().set(AccessSpecToAttr(*accessSpec)); 2997 } 2998 const auto &names{std::get<std::list<parser::Name>>(x.t)}; 2999 AddSpecificProcs(names, ProcedureKind::Procedure); 3000 genericInfo_.pop(); 3001 } 3002 3003 bool InterfaceVisitor::inInterfaceBlock() const { 3004 return !genericInfo_.empty() && GetGenericInfo().isInterface; 3005 } 3006 bool InterfaceVisitor::isGeneric() const { 3007 return !genericInfo_.empty() && GetGenericInfo().symbol; 3008 } 3009 bool InterfaceVisitor::isAbstract() const { 3010 return !genericInfo_.empty() && GetGenericInfo().isAbstract; 3011 } 3012 3013 void InterfaceVisitor::AddSpecificProcs( 3014 const std::list<parser::Name> &names, ProcedureKind kind) { 3015 for (const auto &name : names) { 3016 specificProcs_.emplace( 3017 GetGenericInfo().symbol, std::make_pair(&name, kind)); 3018 } 3019 } 3020 3021 // By now we should have seen all specific procedures referenced by name in 3022 // this generic interface. Resolve those names to symbols. 3023 void InterfaceVisitor::ResolveSpecificsInGeneric(Symbol &generic) { 3024 auto &details{generic.get<GenericDetails>()}; 3025 UnorderedSymbolSet symbolsSeen; 3026 for (const Symbol &symbol : details.specificProcs()) { 3027 symbolsSeen.insert(symbol.GetUltimate()); 3028 } 3029 auto range{specificProcs_.equal_range(&generic)}; 3030 for (auto it{range.first}; it != range.second; ++it) { 3031 const parser::Name *name{it->second.first}; 3032 auto kind{it->second.second}; 3033 const auto *symbol{FindSymbol(*name)}; 3034 if (!symbol) { 3035 Say(*name, "Procedure '%s' not found"_err_en_US); 3036 continue; 3037 } 3038 const Symbol &specific{BypassGeneric(*symbol)}; 3039 const Symbol &ultimate{specific.GetUltimate()}; 3040 if (!ultimate.has<SubprogramDetails>() && 3041 !ultimate.has<SubprogramNameDetails>()) { 3042 Say(*name, "'%s' is not a subprogram"_err_en_US); 3043 continue; 3044 } 3045 if (kind == ProcedureKind::ModuleProcedure) { 3046 if (const auto *nd{ultimate.detailsIf<SubprogramNameDetails>()}) { 3047 if (nd->kind() != SubprogramKind::Module) { 3048 Say(*name, "'%s' is not a module procedure"_err_en_US); 3049 } 3050 } else { 3051 // USE-associated procedure 3052 const auto *sd{ultimate.detailsIf<SubprogramDetails>()}; 3053 CHECK(sd); 3054 if (ultimate.owner().kind() != Scope::Kind::Module || 3055 sd->isInterface()) { 3056 Say(*name, "'%s' is not a module procedure"_err_en_US); 3057 } 3058 } 3059 } 3060 if (symbolsSeen.insert(ultimate).second /*true if added*/) { 3061 // When a specific procedure is a USE association, that association 3062 // is saved in the generic's specifics, not its ultimate symbol, 3063 // so that module file output of interfaces can distinguish them. 3064 details.AddSpecificProc(specific, name->source); 3065 } else if (&specific == &ultimate) { 3066 Say(name->source, 3067 "Procedure '%s' is already specified in generic '%s'"_err_en_US, 3068 name->source, MakeOpName(generic.name())); 3069 } else { 3070 Say(name->source, 3071 "Procedure '%s' from module '%s' is already specified in generic '%s'"_err_en_US, 3072 ultimate.name(), ultimate.owner().GetName().value(), 3073 MakeOpName(generic.name())); 3074 } 3075 } 3076 specificProcs_.erase(range.first, range.second); 3077 } 3078 3079 // Check that the specific procedures are all functions or all subroutines. 3080 // If there is a derived type with the same name they must be functions. 3081 // Set the corresponding flag on generic. 3082 void InterfaceVisitor::CheckGenericProcedures(Symbol &generic) { 3083 ResolveSpecificsInGeneric(generic); 3084 auto &details{generic.get<GenericDetails>()}; 3085 if (auto *proc{details.CheckSpecific()}) { 3086 auto msg{ 3087 "'%s' may not be the name of both a generic interface and a" 3088 " procedure unless it is a specific procedure of the generic"_err_en_US}; 3089 if (proc->name().begin() > generic.name().begin()) { 3090 Say(proc->name(), std::move(msg)); 3091 } else { 3092 Say(generic.name(), std::move(msg)); 3093 } 3094 } 3095 auto &specifics{details.specificProcs()}; 3096 if (specifics.empty()) { 3097 if (details.derivedType()) { 3098 generic.set(Symbol::Flag::Function); 3099 } 3100 return; 3101 } 3102 const Symbol &firstSpecific{specifics.front()}; 3103 bool isFunction{firstSpecific.test(Symbol::Flag::Function)}; 3104 for (const Symbol &specific : specifics) { 3105 if (isFunction != specific.test(Symbol::Flag::Function)) { // C1514 3106 auto &msg{Say(generic.name(), 3107 "Generic interface '%s' has both a function and a subroutine"_err_en_US)}; 3108 if (isFunction) { 3109 msg.Attach(firstSpecific.name(), "Function declaration"_en_US); 3110 msg.Attach(specific.name(), "Subroutine declaration"_en_US); 3111 } else { 3112 msg.Attach(firstSpecific.name(), "Subroutine declaration"_en_US); 3113 msg.Attach(specific.name(), "Function declaration"_en_US); 3114 } 3115 } 3116 } 3117 if (!isFunction && details.derivedType()) { 3118 SayDerivedType(generic.name(), 3119 "Generic interface '%s' may only contain functions due to derived type" 3120 " with same name"_err_en_US, 3121 *details.derivedType()->scope()); 3122 } 3123 generic.set(isFunction ? Symbol::Flag::Function : Symbol::Flag::Subroutine); 3124 } 3125 3126 // SubprogramVisitor implementation 3127 3128 // Return false if it is actually an assignment statement. 3129 bool SubprogramVisitor::HandleStmtFunction(const parser::StmtFunctionStmt &x) { 3130 const auto &name{std::get<parser::Name>(x.t)}; 3131 const DeclTypeSpec *resultType{nullptr}; 3132 // Look up name: provides return type or tells us if it's an array 3133 if (auto *symbol{FindSymbol(name)}) { 3134 auto *details{symbol->detailsIf<EntityDetails>()}; 3135 if (!details) { 3136 badStmtFuncFound_ = true; 3137 return false; 3138 } 3139 // TODO: check that attrs are compatible with stmt func 3140 resultType = details->type(); 3141 symbol->details() = UnknownDetails{}; // will be replaced below 3142 } 3143 if (badStmtFuncFound_) { 3144 Say(name, "'%s' has not been declared as an array"_err_en_US); 3145 return true; 3146 } 3147 auto &symbol{PushSubprogramScope(name, Symbol::Flag::Function)}; 3148 symbol.set(Symbol::Flag::StmtFunction); 3149 EraseSymbol(symbol); // removes symbol added by PushSubprogramScope 3150 auto &details{symbol.get<SubprogramDetails>()}; 3151 for (const auto &dummyName : std::get<std::list<parser::Name>>(x.t)) { 3152 ObjectEntityDetails dummyDetails{true}; 3153 if (auto *dummySymbol{FindInScope(currScope().parent(), dummyName)}) { 3154 if (auto *d{dummySymbol->detailsIf<EntityDetails>()}) { 3155 if (d->type()) { 3156 dummyDetails.set_type(*d->type()); 3157 } 3158 } 3159 } 3160 Symbol &dummy{MakeSymbol(dummyName, std::move(dummyDetails))}; 3161 ApplyImplicitRules(dummy); 3162 details.add_dummyArg(dummy); 3163 } 3164 ObjectEntityDetails resultDetails; 3165 if (resultType) { 3166 resultDetails.set_type(*resultType); 3167 } 3168 resultDetails.set_funcResult(true); 3169 Symbol &result{MakeSymbol(name, std::move(resultDetails))}; 3170 ApplyImplicitRules(result); 3171 details.set_result(result); 3172 const auto &parsedExpr{std::get<parser::Scalar<parser::Expr>>(x.t)}; 3173 Walk(parsedExpr); 3174 // The analysis of the expression that constitutes the body of the 3175 // statement function is deferred to FinishSpecificationPart() so that 3176 // all declarations and implicit typing are complete. 3177 PopScope(); 3178 return true; 3179 } 3180 3181 bool SubprogramVisitor::Pre(const parser::Suffix &suffix) { 3182 if (suffix.resultName) { 3183 if (IsFunction(currScope())) { 3184 if (FuncResultStack::FuncInfo * info{funcResultStack().Top()}) { 3185 if (info->inFunctionStmt) { 3186 info->resultName = &suffix.resultName.value(); 3187 } else { 3188 // will check the result name in Post(EntryStmt) 3189 } 3190 } 3191 } else { 3192 Message &msg{Say(*suffix.resultName, 3193 "RESULT(%s) may appear only in a function"_err_en_US)}; 3194 if (const Symbol * subprogram{InclusiveScope().symbol()}) { 3195 msg.Attach(subprogram->name(), "Containing subprogram"_en_US); 3196 } 3197 } 3198 } 3199 return true; 3200 } 3201 3202 bool SubprogramVisitor::Pre(const parser::PrefixSpec &x) { 3203 // Save this to process after UseStmt and ImplicitPart 3204 if (const auto *parsedType{std::get_if<parser::DeclarationTypeSpec>(&x.u)}) { 3205 FuncResultStack::FuncInfo &info{DEREF(funcResultStack().Top())}; 3206 if (info.parsedType) { // C1543 3207 Say(currStmtSource().value(), 3208 "FUNCTION prefix cannot specify the type more than once"_err_en_US); 3209 return false; 3210 } else { 3211 info.parsedType = parsedType; 3212 info.source = currStmtSource(); 3213 return false; 3214 } 3215 } else { 3216 return true; 3217 } 3218 } 3219 3220 bool SubprogramVisitor::Pre(const parser::InterfaceBody::Subroutine &x) { 3221 const auto &name{std::get<parser::Name>( 3222 std::get<parser::Statement<parser::SubroutineStmt>>(x.t).statement.t)}; 3223 return BeginSubprogram(name, Symbol::Flag::Subroutine); 3224 } 3225 void SubprogramVisitor::Post(const parser::InterfaceBody::Subroutine &) { 3226 EndSubprogram(); 3227 } 3228 bool SubprogramVisitor::Pre(const parser::InterfaceBody::Function &x) { 3229 const auto &name{std::get<parser::Name>( 3230 std::get<parser::Statement<parser::FunctionStmt>>(x.t).statement.t)}; 3231 return BeginSubprogram(name, Symbol::Flag::Function); 3232 } 3233 void SubprogramVisitor::Post(const parser::InterfaceBody::Function &) { 3234 EndSubprogram(); 3235 } 3236 3237 bool SubprogramVisitor::Pre(const parser::SubroutineStmt &) { 3238 return BeginAttrs(); 3239 } 3240 bool SubprogramVisitor::Pre(const parser::FunctionStmt &) { 3241 FuncResultStack::FuncInfo &info{DEREF(funcResultStack().Top())}; 3242 CHECK(!info.inFunctionStmt); 3243 info.inFunctionStmt = true; 3244 return BeginAttrs(); 3245 } 3246 bool SubprogramVisitor::Pre(const parser::EntryStmt &) { return BeginAttrs(); } 3247 3248 void SubprogramVisitor::Post(const parser::SubroutineStmt &stmt) { 3249 const auto &name{std::get<parser::Name>(stmt.t)}; 3250 auto &details{PostSubprogramStmt(name)}; 3251 for (const auto &dummyArg : std::get<std::list<parser::DummyArg>>(stmt.t)) { 3252 if (const auto *dummyName{std::get_if<parser::Name>(&dummyArg.u)}) { 3253 Symbol &dummy{MakeSymbol(*dummyName, EntityDetails{true})}; 3254 details.add_dummyArg(dummy); 3255 } else { 3256 details.add_alternateReturn(); 3257 } 3258 } 3259 } 3260 3261 void SubprogramVisitor::Post(const parser::FunctionStmt &stmt) { 3262 const auto &name{std::get<parser::Name>(stmt.t)}; 3263 auto &details{PostSubprogramStmt(name)}; 3264 for (const auto &dummyName : std::get<std::list<parser::Name>>(stmt.t)) { 3265 Symbol &dummy{MakeSymbol(dummyName, EntityDetails{true})}; 3266 details.add_dummyArg(dummy); 3267 } 3268 const parser::Name *funcResultName; 3269 FuncResultStack::FuncInfo &info{DEREF(funcResultStack().Top())}; 3270 CHECK(info.inFunctionStmt); 3271 info.inFunctionStmt = false; 3272 if (info.resultName && info.resultName->source != name.source) { 3273 // Note that RESULT is ignored if it has the same name as the function. 3274 funcResultName = info.resultName; 3275 } else { 3276 EraseSymbol(name); // was added by PushSubprogramScope 3277 funcResultName = &name; 3278 } 3279 // add function result to function scope 3280 if (details.isFunction()) { 3281 CHECK(context().HasError(currScope().symbol())); 3282 } else { 3283 // add function result to function scope 3284 EntityDetails funcResultDetails; 3285 funcResultDetails.set_funcResult(true); 3286 Symbol &result{MakeSymbol(*funcResultName, std::move(funcResultDetails))}; 3287 info.resultSymbol = &result; 3288 details.set_result(result); 3289 } 3290 // C1560. 3291 if (info.resultName && info.resultName->source == name.source) { 3292 Say(info.resultName->source, 3293 "The function name should not appear in RESULT, references to '%s' " 3294 "inside the function will be considered as references to the " 3295 "result only"_warn_en_US, 3296 name.source); 3297 // RESULT name was ignored above, the only side effect from doing so will be 3298 // the inability to make recursive calls. The related parser::Name is still 3299 // resolved to the created function result symbol because every parser::Name 3300 // should be resolved to avoid internal errors. 3301 Resolve(*info.resultName, info.resultSymbol); 3302 } 3303 name.symbol = currScope().symbol(); // must not be function result symbol 3304 // Clear the RESULT() name now in case an ENTRY statement in the implicit-part 3305 // has a RESULT() suffix. 3306 info.resultName = nullptr; 3307 } 3308 3309 SubprogramDetails &SubprogramVisitor::PostSubprogramStmt( 3310 const parser::Name &name) { 3311 Symbol &symbol{*currScope().symbol()}; 3312 auto &subp{symbol.get<SubprogramDetails>()}; 3313 SetBindNameOn(symbol); 3314 CHECK(name.source == symbol.name() || 3315 (subp.bindName() && symbol.owner().IsGlobal() && 3316 context().IsTempName(symbol.name().ToString()))); 3317 symbol.attrs() |= EndAttrs(); 3318 if (symbol.attrs().test(Attr::MODULE)) { 3319 symbol.attrs().set(Attr::EXTERNAL, false); 3320 } 3321 return symbol.get<SubprogramDetails>(); 3322 } 3323 3324 void SubprogramVisitor::Post(const parser::EntryStmt &stmt) { 3325 PostEntryStmt(stmt); 3326 EndAttrs(); 3327 } 3328 3329 void SubprogramVisitor::PostEntryStmt(const parser::EntryStmt &stmt) { 3330 Scope &inclusiveScope{InclusiveScope()}; 3331 const Symbol *subprogram{inclusiveScope.symbol()}; 3332 if (!subprogram) { 3333 CHECK(context().AnyFatalError()); 3334 return; 3335 } 3336 const auto &name{std::get<parser::Name>(stmt.t)}; 3337 const parser::Name *resultName{nullptr}; 3338 if (const auto &maybeSuffix{ 3339 std::get<std::optional<parser::Suffix>>(stmt.t)}) { 3340 resultName = common::GetPtrFromOptional(maybeSuffix->resultName); 3341 } 3342 bool inFunction{IsFunction(currScope())}; 3343 if (resultName) { // RESULT(result) is present 3344 if (!inFunction) { 3345 // error was already emitted for the suffix 3346 } else if (resultName->source == subprogram->name()) { // C1574 3347 Say2(resultName->source, 3348 "RESULT(%s) may not have the same name as the function"_err_en_US, 3349 subprogram->name(), "Containing function"_en_US); 3350 } else if (const Symbol * 3351 symbol{FindSymbol(inclusiveScope.parent(), *resultName)}) { // C1574 3352 if (const auto *details{symbol->detailsIf<SubprogramDetails>()}) { 3353 if (details->entryScope() == &inclusiveScope) { 3354 Say2(resultName->source, 3355 "RESULT(%s) may not have the same name as an ENTRY in the function"_err_en_US, 3356 symbol->name(), "Conflicting ENTRY"_en_US); 3357 } 3358 } 3359 } 3360 if (Symbol * symbol{FindSymbol(name)}) { // C1570 3361 // When RESULT() appears, ENTRY name can't have been already declared 3362 if (inclusiveScope.Contains(symbol->owner())) { 3363 Say2(name, 3364 "ENTRY name '%s' may not be declared when RESULT() is present"_err_en_US, 3365 *symbol, "Previous declaration of '%s'"_en_US); 3366 } 3367 } 3368 if (resultName->source == name.source) { 3369 // ignore RESULT() hereafter when it's the same name as the ENTRY 3370 resultName = nullptr; 3371 } 3372 } 3373 SubprogramDetails entryDetails; 3374 entryDetails.set_entryScope(inclusiveScope); 3375 if (inFunction) { 3376 // Create the entity to hold the function result, if necessary. 3377 Symbol *resultSymbol{nullptr}; 3378 auto &effectiveResultName{*(resultName ? resultName : &name)}; 3379 resultSymbol = FindInScope(currScope(), effectiveResultName); 3380 if (resultSymbol) { // C1574 3381 common::visit( 3382 common::visitors{[](EntityDetails &x) { x.set_funcResult(true); }, 3383 [](ObjectEntityDetails &x) { x.set_funcResult(true); }, 3384 [](ProcEntityDetails &x) { x.set_funcResult(true); }, 3385 [&](const auto &) { 3386 Say2(effectiveResultName.source, 3387 "'%s' was previously declared as an item that may not be used as a function result"_err_en_US, 3388 resultSymbol->name(), "Previous declaration of '%s'"_en_US); 3389 context().SetError(*resultSymbol); 3390 }}, 3391 resultSymbol->details()); 3392 } else if (inExecutionPart_) { 3393 ObjectEntityDetails entity; 3394 entity.set_funcResult(true); 3395 resultSymbol = &MakeSymbol(effectiveResultName, std::move(entity)); 3396 ApplyImplicitRules(*resultSymbol); 3397 } else { 3398 EntityDetails entity; 3399 entity.set_funcResult(true); 3400 resultSymbol = &MakeSymbol(effectiveResultName, std::move(entity)); 3401 } 3402 if (!resultName) { 3403 name.symbol = nullptr; // symbol will be used for entry point below 3404 } 3405 entryDetails.set_result(*resultSymbol); 3406 } 3407 3408 for (const auto &dummyArg : std::get<std::list<parser::DummyArg>>(stmt.t)) { 3409 if (const auto *dummyName{std::get_if<parser::Name>(&dummyArg.u)}) { 3410 Symbol *dummy{FindSymbol(*dummyName)}; 3411 if (dummy) { 3412 common::visit( 3413 common::visitors{[](EntityDetails &x) { x.set_isDummy(); }, 3414 [](ObjectEntityDetails &x) { x.set_isDummy(); }, 3415 [](ProcEntityDetails &x) { x.set_isDummy(); }, 3416 [](SubprogramDetails &x) { x.set_isDummy(); }, 3417 [&](const auto &) { 3418 Say2(dummyName->source, 3419 "ENTRY dummy argument '%s' is previously declared as an item that may not be used as a dummy argument"_err_en_US, 3420 dummy->name(), "Previous declaration of '%s'"_en_US); 3421 }}, 3422 dummy->details()); 3423 } else { 3424 dummy = &MakeSymbol(*dummyName, EntityDetails{true}); 3425 if (inExecutionPart_) { 3426 ApplyImplicitRules(*dummy); 3427 } 3428 } 3429 entryDetails.add_dummyArg(*dummy); 3430 } else { 3431 if (inFunction) { // C1573 3432 Say(name, 3433 "ENTRY in a function may not have an alternate return dummy argument"_err_en_US); 3434 break; 3435 } 3436 entryDetails.add_alternateReturn(); 3437 } 3438 } 3439 3440 Symbol::Flag subpFlag{ 3441 inFunction ? Symbol::Flag::Function : Symbol::Flag::Subroutine}; 3442 Scope &outer{inclusiveScope.parent()}; // global or module scope 3443 if (outer.IsModule() && attrs_ && !attrs_->test(Attr::PRIVATE)) { 3444 attrs_->set(Attr::PUBLIC); 3445 } 3446 if (Symbol * extant{FindSymbol(outer, name)}) { 3447 if (!HandlePreviousCalls(name, *extant, subpFlag)) { 3448 if (outer.IsGlobal()) { 3449 Say2(name, "'%s' is already defined as a global identifier"_err_en_US, 3450 *extant, "Previous definition of '%s'"_en_US); 3451 } else { 3452 SayAlreadyDeclared(name, *extant); 3453 } 3454 return; 3455 } 3456 } 3457 3458 Symbol *entrySymbol{&MakeSymbol(outer, name.source, GetAttrs())}; 3459 if (auto *generic{entrySymbol->detailsIf<GenericDetails>()}) { 3460 CHECK(generic->specific()); 3461 entrySymbol = generic->specific(); 3462 } 3463 entrySymbol->set_details(std::move(entryDetails)); 3464 SetBindNameOn(*entrySymbol); 3465 entrySymbol->set(subpFlag); 3466 Resolve(name, *entrySymbol); 3467 } 3468 3469 // A subprogram declared with MODULE PROCEDURE 3470 bool SubprogramVisitor::BeginMpSubprogram(const parser::Name &name) { 3471 auto *symbol{FindSymbol(name)}; 3472 if (symbol && symbol->has<SubprogramNameDetails>()) { 3473 symbol = FindSymbol(currScope().parent(), name); 3474 } 3475 if (!IsSeparateModuleProcedureInterface(symbol)) { 3476 Say(name, "'%s' was not declared a separate module procedure"_err_en_US); 3477 return false; 3478 } 3479 if (symbol->owner() == currScope() && symbol->scope()) { 3480 // This is a MODULE PROCEDURE whose interface appears in its host. 3481 // Convert the module procedure's interface into a subprogram. 3482 SetScope(DEREF(symbol->scope())); 3483 symbol->get<SubprogramDetails>().set_isInterface(false); 3484 if (IsFunction(*symbol)) { 3485 funcResultStack().Push(); // just to be popped later 3486 } 3487 } else { 3488 // Copy the interface into a new subprogram scope. 3489 Symbol &newSymbol{MakeSymbol(name, SubprogramDetails{})}; 3490 PushScope(Scope::Kind::Subprogram, &newSymbol); 3491 const auto &details{symbol->get<SubprogramDetails>()}; 3492 auto &newDetails{newSymbol.get<SubprogramDetails>()}; 3493 newDetails.set_moduleInterface(*symbol); 3494 for (const Symbol *dummyArg : details.dummyArgs()) { 3495 if (!dummyArg) { 3496 newDetails.add_alternateReturn(); 3497 } else if (Symbol * copy{currScope().CopySymbol(*dummyArg)}) { 3498 newDetails.add_dummyArg(*copy); 3499 } 3500 } 3501 if (details.isFunction()) { 3502 currScope().erase(symbol->name()); 3503 newDetails.set_result(*currScope().CopySymbol(details.result())); 3504 funcResultStack().Push(); // just to be popped later 3505 } 3506 } 3507 return true; 3508 } 3509 3510 // A subprogram or interface declared with SUBROUTINE or FUNCTION 3511 bool SubprogramVisitor::BeginSubprogram(const parser::Name &name, 3512 Symbol::Flag subpFlag, bool hasModulePrefix, 3513 const parser::LanguageBindingSpec *bindingSpec) { 3514 if (hasModulePrefix && currScope().IsGlobal()) { // C1547 3515 Say(name, 3516 "'%s' is a MODULE procedure which must be declared within a " 3517 "MODULE or SUBMODULE"_err_en_US); 3518 return false; 3519 } 3520 Symbol *moduleInterface{nullptr}; 3521 if (hasModulePrefix && !inInterfaceBlock()) { 3522 moduleInterface = FindSymbol(currScope(), name); 3523 if (IsSeparateModuleProcedureInterface(moduleInterface)) { 3524 // Subprogram is MODULE FUNCTION or MODULE SUBROUTINE with an interface 3525 // previously defined in the same scope. 3526 currScope().erase(moduleInterface->name()); 3527 } else { 3528 moduleInterface = nullptr; 3529 } 3530 if (!moduleInterface) { 3531 moduleInterface = FindSymbol(currScope().parent(), name); 3532 if (!IsSeparateModuleProcedureInterface(moduleInterface)) { 3533 Say(name, 3534 "'%s' was not declared a separate module procedure"_err_en_US); 3535 return false; 3536 } 3537 } 3538 } 3539 Symbol &newSymbol{PushSubprogramScope(name, subpFlag, bindingSpec)}; 3540 if (moduleInterface) { 3541 newSymbol.get<SubprogramDetails>().set_moduleInterface(*moduleInterface); 3542 if (moduleInterface->attrs().test(Attr::PRIVATE)) { 3543 newSymbol.attrs().set(Attr::PRIVATE); 3544 } else if (moduleInterface->attrs().test(Attr::PUBLIC)) { 3545 newSymbol.attrs().set(Attr::PUBLIC); 3546 } 3547 } 3548 if (IsFunction(currScope())) { 3549 funcResultStack().Push(); 3550 } 3551 return true; 3552 } 3553 3554 void SubprogramVisitor::EndSubprogram() { 3555 if (IsFunction(currScope())) { 3556 funcResultStack().Pop(); 3557 } 3558 PopScope(); 3559 } 3560 3561 bool SubprogramVisitor::HandlePreviousCalls( 3562 const parser::Name &name, Symbol &symbol, Symbol::Flag subpFlag) { 3563 // If the extant symbol is a generic, check its homonymous specific 3564 // procedure instead if it has one. 3565 if (auto *generic{symbol.detailsIf<GenericDetails>()}) { 3566 return generic->specific() && 3567 HandlePreviousCalls(name, *generic->specific(), subpFlag); 3568 } else if (const auto *proc{symbol.detailsIf<ProcEntityDetails>()}; proc && 3569 !proc->isDummy() && 3570 !symbol.attrs().HasAny(Attrs{Attr::INTRINSIC, Attr::POINTER})) { 3571 // There's a symbol created for previous calls to this subprogram or 3572 // ENTRY's name. We have to replace that symbol in situ to avoid the 3573 // obligation to rewrite symbol pointers in the parse tree. 3574 if (!symbol.test(subpFlag)) { 3575 Say2(name, 3576 subpFlag == Symbol::Flag::Function 3577 ? "'%s' was previously called as a subroutine"_err_en_US 3578 : "'%s' was previously called as a function"_err_en_US, 3579 symbol, "Previous call of '%s'"_en_US); 3580 } 3581 EntityDetails entity; 3582 if (proc->type()) { 3583 entity.set_type(*proc->type()); 3584 } 3585 symbol.details() = std::move(entity); 3586 return true; 3587 } else { 3588 return symbol.has<UnknownDetails>() || symbol.has<SubprogramNameDetails>(); 3589 } 3590 } 3591 3592 void SubprogramVisitor::CheckExtantProc( 3593 const parser::Name &name, Symbol::Flag subpFlag) { 3594 if (auto *prev{FindSymbol(name)}) { 3595 if (IsDummy(*prev)) { 3596 } else if (inInterfaceBlock() && currScope() != prev->owner()) { 3597 // Procedures in an INTERFACE block do not resolve to symbols 3598 // in scopes between the global scope and the current scope. 3599 } else if (!HandlePreviousCalls(name, *prev, subpFlag)) { 3600 SayAlreadyDeclared(name, *prev); 3601 } 3602 } 3603 } 3604 3605 Symbol &SubprogramVisitor::PushSubprogramScope(const parser::Name &name, 3606 Symbol::Flag subpFlag, const parser::LanguageBindingSpec *bindingSpec) { 3607 Symbol *symbol{GetSpecificFromGeneric(name)}; 3608 if (!symbol) { 3609 if (bindingSpec && currScope().IsGlobal() && bindingSpec->v) { 3610 // Create this new top-level subprogram with a binding label 3611 // in a new global scope, so that its symbol's name won't clash 3612 // with another symbol that has a distinct binding label. 3613 PushScope(Scope::Kind::Global, 3614 &MakeSymbol(context().GetTempName(currScope()), Attrs{}, 3615 MiscDetails{MiscDetails::Kind::ScopeName})); 3616 } 3617 CheckExtantProc(name, subpFlag); 3618 symbol = &MakeSymbol(name, SubprogramDetails{}); 3619 } 3620 symbol->ReplaceName(name.source); 3621 symbol->set(subpFlag); 3622 PushScope(Scope::Kind::Subprogram, symbol); 3623 auto &details{symbol->get<SubprogramDetails>()}; 3624 if (inInterfaceBlock()) { 3625 details.set_isInterface(); 3626 if (isAbstract()) { 3627 symbol->attrs().set(Attr::ABSTRACT); 3628 } else { 3629 MakeExternal(*symbol); 3630 } 3631 if (isGeneric()) { 3632 Symbol &genericSymbol{GetGenericSymbol()}; 3633 if (genericSymbol.has<GenericDetails>()) { 3634 genericSymbol.get<GenericDetails>().AddSpecificProc( 3635 *symbol, name.source); 3636 } else { 3637 CHECK(context().HasError(genericSymbol)); 3638 } 3639 } 3640 set_inheritFromParent(false); 3641 } 3642 FindSymbol(name)->set(subpFlag); // PushScope() created symbol 3643 return *symbol; 3644 } 3645 3646 void SubprogramVisitor::PushBlockDataScope(const parser::Name &name) { 3647 if (auto *prev{FindSymbol(name)}) { 3648 if (prev->attrs().test(Attr::EXTERNAL) && prev->has<ProcEntityDetails>()) { 3649 if (prev->test(Symbol::Flag::Subroutine) || 3650 prev->test(Symbol::Flag::Function)) { 3651 Say2(name, "BLOCK DATA '%s' has been called"_err_en_US, *prev, 3652 "Previous call of '%s'"_en_US); 3653 } 3654 EraseSymbol(name); 3655 } 3656 } 3657 if (name.source.empty()) { 3658 // Don't let unnamed BLOCK DATA conflict with unnamed PROGRAM 3659 PushScope(Scope::Kind::BlockData, nullptr); 3660 } else { 3661 PushScope(Scope::Kind::BlockData, &MakeSymbol(name, SubprogramDetails{})); 3662 } 3663 } 3664 3665 // If name is a generic, return specific subprogram with the same name. 3666 Symbol *SubprogramVisitor::GetSpecificFromGeneric(const parser::Name &name) { 3667 if (auto *symbol{FindSymbol(name)}) { 3668 if (auto *details{symbol->detailsIf<GenericDetails>()}) { 3669 // found generic, want subprogram 3670 auto *specific{details->specific()}; 3671 if (!specific) { 3672 specific = 3673 &currScope().MakeSymbol(name.source, Attrs{}, SubprogramDetails{}); 3674 if (details->derivedType()) { 3675 // A specific procedure with the same name as a derived type 3676 SayAlreadyDeclared(name, *details->derivedType()); 3677 } else { 3678 details->set_specific(Resolve(name, *specific)); 3679 } 3680 } else if (isGeneric()) { 3681 SayAlreadyDeclared(name, *specific); 3682 } 3683 if (!specific->has<SubprogramDetails>()) { 3684 specific->set_details(SubprogramDetails{}); 3685 } 3686 return specific; 3687 } 3688 } 3689 return nullptr; 3690 } 3691 3692 // DeclarationVisitor implementation 3693 3694 bool DeclarationVisitor::BeginDecl() { 3695 BeginDeclTypeSpec(); 3696 BeginArraySpec(); 3697 return BeginAttrs(); 3698 } 3699 void DeclarationVisitor::EndDecl() { 3700 EndDeclTypeSpec(); 3701 EndArraySpec(); 3702 EndAttrs(); 3703 } 3704 3705 bool DeclarationVisitor::CheckUseError(const parser::Name &name) { 3706 const auto *details{ 3707 name.symbol ? name.symbol->detailsIf<UseErrorDetails>() : nullptr}; 3708 if (!details) { 3709 return false; 3710 } 3711 Message &msg{Say(name, "Reference to '%s' is ambiguous"_err_en_US)}; 3712 for (const auto &[location, module] : details->occurrences()) { 3713 msg.Attach(location, "'%s' was use-associated from module '%s'"_en_US, 3714 name.source, module->GetName().value()); 3715 } 3716 context().SetError(*name.symbol); 3717 return true; 3718 } 3719 3720 // Report error if accessibility of symbol doesn't match isPrivate. 3721 void DeclarationVisitor::CheckAccessibility( 3722 const SourceName &name, bool isPrivate, Symbol &symbol) { 3723 if (symbol.attrs().test(Attr::PRIVATE) != isPrivate) { 3724 Say2(name, 3725 "'%s' does not have the same accessibility as its previous declaration"_err_en_US, 3726 symbol, "Previous declaration of '%s'"_en_US); 3727 } 3728 } 3729 3730 void DeclarationVisitor::Post(const parser::TypeDeclarationStmt &) { 3731 if (!GetAttrs().HasAny({Attr::POINTER, Attr::ALLOCATABLE})) { // C702 3732 if (const auto *typeSpec{GetDeclTypeSpec()}) { 3733 if (typeSpec->category() == DeclTypeSpec::Character) { 3734 if (typeSpec->characterTypeSpec().length().isDeferred()) { 3735 Say("The type parameter LEN cannot be deferred without" 3736 " the POINTER or ALLOCATABLE attribute"_err_en_US); 3737 } 3738 } else if (const DerivedTypeSpec * derivedSpec{typeSpec->AsDerived()}) { 3739 for (const auto &pair : derivedSpec->parameters()) { 3740 if (pair.second.isDeferred()) { 3741 Say(currStmtSource().value(), 3742 "The value of type parameter '%s' cannot be deferred" 3743 " without the POINTER or ALLOCATABLE attribute"_err_en_US, 3744 pair.first); 3745 } 3746 } 3747 } 3748 } 3749 } 3750 EndDecl(); 3751 } 3752 3753 void DeclarationVisitor::Post(const parser::DimensionStmt::Declaration &x) { 3754 DeclareObjectEntity(std::get<parser::Name>(x.t)); 3755 } 3756 void DeclarationVisitor::Post(const parser::CodimensionDecl &x) { 3757 DeclareObjectEntity(std::get<parser::Name>(x.t)); 3758 } 3759 3760 bool DeclarationVisitor::Pre(const parser::Initialization &) { 3761 // Defer inspection of initializers to Initialization() so that the 3762 // symbol being initialized will be available within the initialization 3763 // expression. 3764 return false; 3765 } 3766 3767 void DeclarationVisitor::Post(const parser::EntityDecl &x) { 3768 const auto &name{std::get<parser::ObjectName>(x.t)}; 3769 Attrs attrs{attrs_ ? HandleSaveName(name.source, *attrs_) : Attrs{}}; 3770 Symbol &symbol{DeclareUnknownEntity(name, attrs)}; 3771 symbol.ReplaceName(name.source); 3772 if (const auto &init{std::get<std::optional<parser::Initialization>>(x.t)}) { 3773 if (ConvertToObjectEntity(symbol)) { 3774 Initialization(name, *init, false); 3775 } 3776 } else if (attrs.test(Attr::PARAMETER)) { // C882, C883 3777 Say(name, "Missing initialization for parameter '%s'"_err_en_US); 3778 } 3779 } 3780 3781 void DeclarationVisitor::Post(const parser::PointerDecl &x) { 3782 const auto &name{std::get<parser::Name>(x.t)}; 3783 if (const auto &deferredShapeSpecs{ 3784 std::get<std::optional<parser::DeferredShapeSpecList>>(x.t)}) { 3785 CHECK(arraySpec().empty()); 3786 BeginArraySpec(); 3787 set_arraySpec(AnalyzeDeferredShapeSpecList(context(), *deferredShapeSpecs)); 3788 Symbol &symbol{DeclareObjectEntity(name, Attrs{Attr::POINTER})}; 3789 symbol.ReplaceName(name.source); 3790 EndArraySpec(); 3791 } else { 3792 HandleAttributeStmt(Attr::POINTER, std::get<parser::Name>(x.t)); 3793 } 3794 } 3795 3796 bool DeclarationVisitor::Pre(const parser::BindEntity &x) { 3797 auto kind{std::get<parser::BindEntity::Kind>(x.t)}; 3798 auto &name{std::get<parser::Name>(x.t)}; 3799 Symbol *symbol; 3800 if (kind == parser::BindEntity::Kind::Object) { 3801 symbol = &HandleAttributeStmt(Attr::BIND_C, name); 3802 } else { 3803 symbol = &MakeCommonBlockSymbol(name); 3804 symbol->attrs().set(Attr::BIND_C); 3805 } 3806 SetBindNameOn(*symbol); 3807 return false; 3808 } 3809 bool DeclarationVisitor::Pre(const parser::OldParameterStmt &x) { 3810 inOldStyleParameterStmt_ = true; 3811 Walk(x.v); 3812 inOldStyleParameterStmt_ = false; 3813 return false; 3814 } 3815 bool DeclarationVisitor::Pre(const parser::NamedConstantDef &x) { 3816 auto &name{std::get<parser::NamedConstant>(x.t).v}; 3817 auto &symbol{HandleAttributeStmt(Attr::PARAMETER, name)}; 3818 if (!ConvertToObjectEntity(symbol) || 3819 symbol.test(Symbol::Flag::CrayPointer) || 3820 symbol.test(Symbol::Flag::CrayPointee)) { 3821 SayWithDecl( 3822 name, symbol, "PARAMETER attribute not allowed on '%s'"_err_en_US); 3823 return false; 3824 } 3825 const auto &expr{std::get<parser::ConstantExpr>(x.t)}; 3826 auto &details{symbol.get<ObjectEntityDetails>()}; 3827 if (inOldStyleParameterStmt_) { 3828 // non-standard extension PARAMETER statement (no parentheses) 3829 Walk(expr); 3830 auto folded{EvaluateExpr(expr)}; 3831 if (details.type()) { 3832 SayWithDecl(name, symbol, 3833 "Alternative style PARAMETER '%s' must not already have an explicit type"_err_en_US); 3834 } else if (folded) { 3835 auto at{expr.thing.value().source}; 3836 if (evaluate::IsActuallyConstant(*folded)) { 3837 if (const auto *type{currScope().GetType(*folded)}) { 3838 if (type->IsPolymorphic()) { 3839 Say(at, "The expression must not be polymorphic"_err_en_US); 3840 } else if (auto shape{ToArraySpec( 3841 GetFoldingContext(), evaluate::GetShape(*folded))}) { 3842 // The type of the named constant is assumed from the expression. 3843 details.set_type(*type); 3844 details.set_init(std::move(*folded)); 3845 details.set_shape(std::move(*shape)); 3846 } else { 3847 Say(at, "The expression must have constant shape"_err_en_US); 3848 } 3849 } else { 3850 Say(at, "The expression must have a known type"_err_en_US); 3851 } 3852 } else { 3853 Say(at, "The expression must be a constant of known type"_err_en_US); 3854 } 3855 } 3856 } else { 3857 // standard-conforming PARAMETER statement (with parentheses) 3858 ApplyImplicitRules(symbol); 3859 Walk(expr); 3860 if (auto converted{EvaluateNonPointerInitializer( 3861 symbol, expr, expr.thing.value().source)}) { 3862 details.set_init(std::move(*converted)); 3863 } 3864 } 3865 return false; 3866 } 3867 bool DeclarationVisitor::Pre(const parser::NamedConstant &x) { 3868 const parser::Name &name{x.v}; 3869 if (!FindSymbol(name)) { 3870 Say(name, "Named constant '%s' not found"_err_en_US); 3871 } else { 3872 CheckUseError(name); 3873 } 3874 return false; 3875 } 3876 3877 bool DeclarationVisitor::Pre(const parser::Enumerator &enumerator) { 3878 const parser::Name &name{std::get<parser::NamedConstant>(enumerator.t).v}; 3879 Symbol *symbol{FindSymbol(name)}; 3880 if (symbol && !symbol->has<UnknownDetails>()) { 3881 // Contrary to named constants appearing in a PARAMETER statement, 3882 // enumerator names should not have their type, dimension or any other 3883 // attributes defined before they are declared in the enumerator statement, 3884 // with the exception of accessibility. 3885 // This is not explicitly forbidden by the standard, but they are scalars 3886 // which type is left for the compiler to chose, so do not let users try to 3887 // tamper with that. 3888 SayAlreadyDeclared(name, *symbol); 3889 symbol = nullptr; 3890 } else { 3891 // Enumerators are treated as PARAMETER (section 7.6 paragraph (4)) 3892 symbol = &MakeSymbol(name, Attrs{Attr::PARAMETER}, ObjectEntityDetails{}); 3893 symbol->SetType(context().MakeNumericType( 3894 TypeCategory::Integer, evaluate::CInteger::kind)); 3895 } 3896 3897 if (auto &init{std::get<std::optional<parser::ScalarIntConstantExpr>>( 3898 enumerator.t)}) { 3899 Walk(*init); // Resolve names in expression before evaluation. 3900 if (auto value{EvaluateInt64(context(), *init)}) { 3901 // Cast all init expressions to C_INT so that they can then be 3902 // safely incremented (see 7.6 Note 2). 3903 enumerationState_.value = static_cast<int>(*value); 3904 } else { 3905 Say(name, 3906 "Enumerator value could not be computed " 3907 "from the given expression"_err_en_US); 3908 // Prevent resolution of next enumerators value 3909 enumerationState_.value = std::nullopt; 3910 } 3911 } 3912 3913 if (symbol) { 3914 if (enumerationState_.value) { 3915 symbol->get<ObjectEntityDetails>().set_init(SomeExpr{ 3916 evaluate::Expr<evaluate::CInteger>{*enumerationState_.value}}); 3917 } else { 3918 context().SetError(*symbol); 3919 } 3920 } 3921 3922 if (enumerationState_.value) { 3923 (*enumerationState_.value)++; 3924 } 3925 return false; 3926 } 3927 3928 void DeclarationVisitor::Post(const parser::EnumDef &) { 3929 enumerationState_ = EnumeratorState{}; 3930 } 3931 3932 bool DeclarationVisitor::Pre(const parser::AccessSpec &x) { 3933 Attr attr{AccessSpecToAttr(x)}; 3934 if (!NonDerivedTypeScope().IsModule()) { // C817 3935 Say(currStmtSource().value(), 3936 "%s attribute may only appear in the specification part of a module"_err_en_US, 3937 EnumToString(attr)); 3938 } 3939 CheckAndSet(attr); 3940 return false; 3941 } 3942 3943 bool DeclarationVisitor::Pre(const parser::AsynchronousStmt &x) { 3944 return HandleAttributeStmt(Attr::ASYNCHRONOUS, x.v); 3945 } 3946 bool DeclarationVisitor::Pre(const parser::ContiguousStmt &x) { 3947 return HandleAttributeStmt(Attr::CONTIGUOUS, x.v); 3948 } 3949 bool DeclarationVisitor::Pre(const parser::ExternalStmt &x) { 3950 HandleAttributeStmt(Attr::EXTERNAL, x.v); 3951 for (const auto &name : x.v) { 3952 auto *symbol{FindSymbol(name)}; 3953 if (!ConvertToProcEntity(DEREF(symbol))) { 3954 SayWithDecl( 3955 name, *symbol, "EXTERNAL attribute not allowed on '%s'"_err_en_US); 3956 } else if (symbol->attrs().test(Attr::INTRINSIC)) { // C840 3957 Say(symbol->name(), 3958 "Symbol '%s' cannot have both INTRINSIC and EXTERNAL attributes"_err_en_US, 3959 symbol->name()); 3960 } 3961 } 3962 return false; 3963 } 3964 bool DeclarationVisitor::Pre(const parser::IntentStmt &x) { 3965 auto &intentSpec{std::get<parser::IntentSpec>(x.t)}; 3966 auto &names{std::get<std::list<parser::Name>>(x.t)}; 3967 return CheckNotInBlock("INTENT") && // C1107 3968 HandleAttributeStmt(IntentSpecToAttr(intentSpec), names); 3969 } 3970 bool DeclarationVisitor::Pre(const parser::IntrinsicStmt &x) { 3971 HandleAttributeStmt(Attr::INTRINSIC, x.v); 3972 for (const auto &name : x.v) { 3973 auto &symbol{DEREF(FindSymbol(name))}; 3974 if (symbol.has<GenericDetails>()) { 3975 // Generic interface is extending intrinsic; ok 3976 } else if (!symbol.has<HostAssocDetails>() && 3977 !ConvertToProcEntity(symbol)) { 3978 SayWithDecl( 3979 name, symbol, "INTRINSIC attribute not allowed on '%s'"_err_en_US); 3980 } else if (symbol.attrs().test(Attr::EXTERNAL)) { // C840 3981 Say(symbol.name(), 3982 "Symbol '%s' cannot have both EXTERNAL and INTRINSIC attributes"_err_en_US, 3983 symbol.name()); 3984 } else if (symbol.GetType()) { 3985 // These warnings are worded so that they should make sense in either 3986 // order. 3987 Say(symbol.name(), 3988 "Explicit type declaration ignored for intrinsic function '%s'"_warn_en_US, 3989 symbol.name()) 3990 .Attach(name.source, 3991 "INTRINSIC statement for explicitly-typed '%s'"_en_US, 3992 name.source); 3993 } 3994 } 3995 return false; 3996 } 3997 bool DeclarationVisitor::Pre(const parser::OptionalStmt &x) { 3998 return CheckNotInBlock("OPTIONAL") && // C1107 3999 HandleAttributeStmt(Attr::OPTIONAL, x.v); 4000 } 4001 bool DeclarationVisitor::Pre(const parser::ProtectedStmt &x) { 4002 return HandleAttributeStmt(Attr::PROTECTED, x.v); 4003 } 4004 bool DeclarationVisitor::Pre(const parser::ValueStmt &x) { 4005 return CheckNotInBlock("VALUE") && // C1107 4006 HandleAttributeStmt(Attr::VALUE, x.v); 4007 } 4008 bool DeclarationVisitor::Pre(const parser::VolatileStmt &x) { 4009 return HandleAttributeStmt(Attr::VOLATILE, x.v); 4010 } 4011 // Handle a statement that sets an attribute on a list of names. 4012 bool DeclarationVisitor::HandleAttributeStmt( 4013 Attr attr, const std::list<parser::Name> &names) { 4014 for (const auto &name : names) { 4015 HandleAttributeStmt(attr, name); 4016 } 4017 return false; 4018 } 4019 Symbol &DeclarationVisitor::HandleAttributeStmt( 4020 Attr attr, const parser::Name &name) { 4021 if (attr == Attr::INTRINSIC) { 4022 if (!IsIntrinsic(name.source, std::nullopt)) { 4023 Say(name.source, "'%s' is not a known intrinsic procedure"_err_en_US); 4024 } else if (currScope().kind() == Scope::Kind::Subprogram || 4025 currScope().kind() == Scope::Kind::Block) { 4026 if (auto *symbol{FindSymbol(name)}) { 4027 if (symbol->GetUltimate().has<GenericDetails>() && 4028 symbol->owner() != currScope()) { 4029 // Declaring a name INTRINSIC when there is a generic 4030 // interface of the same name in the host scope. 4031 // Host-associate the generic and mark it INTRINSIC 4032 // rather than completely overriding the generic. 4033 symbol = &MakeHostAssocSymbol(name, *symbol); 4034 symbol->attrs().set(Attr::INTRINSIC); 4035 return *symbol; 4036 } 4037 } 4038 } 4039 } 4040 auto *symbol{FindInScope(name)}; 4041 if (attr == Attr::ASYNCHRONOUS || attr == Attr::VOLATILE) { 4042 // these can be set on a symbol that is host-assoc or use-assoc 4043 if (!symbol && 4044 (currScope().kind() == Scope::Kind::Subprogram || 4045 currScope().kind() == Scope::Kind::Block)) { 4046 if (auto *hostSymbol{FindSymbol(name)}) { 4047 symbol = &MakeHostAssocSymbol(name, *hostSymbol); 4048 } 4049 } 4050 } else if (symbol && symbol->has<UseDetails>()) { 4051 Say(currStmtSource().value(), 4052 "Cannot change %s attribute on use-associated '%s'"_err_en_US, 4053 EnumToString(attr), name.source); 4054 return *symbol; 4055 } 4056 if (!symbol) { 4057 symbol = &MakeSymbol(name, EntityDetails{}); 4058 } 4059 symbol->attrs().set(attr); 4060 symbol->attrs() = HandleSaveName(name.source, symbol->attrs()); 4061 return *symbol; 4062 } 4063 // C1107 4064 bool DeclarationVisitor::CheckNotInBlock(const char *stmt) { 4065 if (currScope().kind() == Scope::Kind::Block) { 4066 Say(MessageFormattedText{ 4067 "%s statement is not allowed in a BLOCK construct"_err_en_US, stmt}); 4068 return false; 4069 } else { 4070 return true; 4071 } 4072 } 4073 4074 void DeclarationVisitor::Post(const parser::ObjectDecl &x) { 4075 CHECK(objectDeclAttr_); 4076 const auto &name{std::get<parser::ObjectName>(x.t)}; 4077 DeclareObjectEntity(name, Attrs{*objectDeclAttr_}); 4078 } 4079 4080 // Declare an entity not yet known to be an object or proc. 4081 Symbol &DeclarationVisitor::DeclareUnknownEntity( 4082 const parser::Name &name, Attrs attrs) { 4083 if (!arraySpec().empty() || !coarraySpec().empty()) { 4084 return DeclareObjectEntity(name, attrs); 4085 } else { 4086 Symbol &symbol{DeclareEntity<EntityDetails>(name, attrs)}; 4087 if (auto *type{GetDeclTypeSpec()}) { 4088 SetType(name, *type); 4089 } 4090 charInfo_.length.reset(); 4091 SetBindNameOn(symbol); 4092 if (symbol.attrs().test(Attr::EXTERNAL)) { 4093 ConvertToProcEntity(symbol); 4094 } 4095 return symbol; 4096 } 4097 } 4098 4099 bool DeclarationVisitor::HasCycle( 4100 const Symbol &procSymbol, const ProcInterface &interface) { 4101 SourceOrderedSymbolSet procsInCycle; 4102 procsInCycle.insert(procSymbol); 4103 const ProcInterface *thisInterface{&interface}; 4104 bool haveInterface{true}; 4105 while (haveInterface) { 4106 haveInterface = false; 4107 if (const Symbol * interfaceSymbol{thisInterface->symbol()}) { 4108 if (procsInCycle.count(*interfaceSymbol) > 0) { 4109 for (const auto &procInCycle : procsInCycle) { 4110 Say(procInCycle->name(), 4111 "The interface for procedure '%s' is recursively " 4112 "defined"_err_en_US, 4113 procInCycle->name()); 4114 context().SetError(*procInCycle); 4115 } 4116 return true; 4117 } else if (const auto *procDetails{ 4118 interfaceSymbol->detailsIf<ProcEntityDetails>()}) { 4119 haveInterface = true; 4120 thisInterface = &procDetails->interface(); 4121 procsInCycle.insert(*interfaceSymbol); 4122 } 4123 } 4124 } 4125 return false; 4126 } 4127 4128 Symbol &DeclarationVisitor::DeclareProcEntity( 4129 const parser::Name &name, Attrs attrs, const ProcInterface &interface) { 4130 Symbol &symbol{DeclareEntity<ProcEntityDetails>(name, attrs)}; 4131 if (auto *details{symbol.detailsIf<ProcEntityDetails>()}) { 4132 if (details->IsInterfaceSet()) { 4133 SayWithDecl(name, symbol, 4134 "The interface for procedure '%s' has already been " 4135 "declared"_err_en_US); 4136 context().SetError(symbol); 4137 } else if (HasCycle(symbol, interface)) { 4138 return symbol; 4139 } else if (interface.type()) { 4140 symbol.set(Symbol::Flag::Function); 4141 } else if (interface.symbol()) { 4142 if (interface.symbol()->test(Symbol::Flag::Function)) { 4143 symbol.set(Symbol::Flag::Function); 4144 } else if (interface.symbol()->test(Symbol::Flag::Subroutine)) { 4145 symbol.set(Symbol::Flag::Subroutine); 4146 } 4147 } 4148 details->set_interface(interface); 4149 SetBindNameOn(symbol); 4150 SetPassNameOn(symbol); 4151 } 4152 return symbol; 4153 } 4154 4155 Symbol &DeclarationVisitor::DeclareObjectEntity( 4156 const parser::Name &name, Attrs attrs) { 4157 Symbol &symbol{DeclareEntity<ObjectEntityDetails>(name, attrs)}; 4158 if (auto *details{symbol.detailsIf<ObjectEntityDetails>()}) { 4159 if (auto *type{GetDeclTypeSpec()}) { 4160 SetType(name, *type); 4161 } 4162 if (!arraySpec().empty()) { 4163 if (details->IsArray()) { 4164 if (!context().HasError(symbol)) { 4165 Say(name, 4166 "The dimensions of '%s' have already been declared"_err_en_US); 4167 context().SetError(symbol); 4168 } 4169 } else { 4170 details->set_shape(arraySpec()); 4171 } 4172 } 4173 if (!coarraySpec().empty()) { 4174 if (details->IsCoarray()) { 4175 if (!context().HasError(symbol)) { 4176 Say(name, 4177 "The codimensions of '%s' have already been declared"_err_en_US); 4178 context().SetError(symbol); 4179 } 4180 } else { 4181 details->set_coshape(coarraySpec()); 4182 } 4183 } 4184 SetBindNameOn(symbol); 4185 } 4186 ClearArraySpec(); 4187 ClearCoarraySpec(); 4188 charInfo_.length.reset(); 4189 return symbol; 4190 } 4191 4192 void DeclarationVisitor::Post(const parser::IntegerTypeSpec &x) { 4193 SetDeclTypeSpec(MakeNumericType(TypeCategory::Integer, x.v)); 4194 } 4195 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Real &x) { 4196 SetDeclTypeSpec(MakeNumericType(TypeCategory::Real, x.kind)); 4197 } 4198 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Complex &x) { 4199 SetDeclTypeSpec(MakeNumericType(TypeCategory::Complex, x.kind)); 4200 } 4201 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Logical &x) { 4202 SetDeclTypeSpec(MakeLogicalType(x.kind)); 4203 } 4204 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Character &) { 4205 if (!charInfo_.length) { 4206 charInfo_.length = ParamValue{1, common::TypeParamAttr::Len}; 4207 } 4208 if (!charInfo_.kind) { 4209 charInfo_.kind = 4210 KindExpr{context().GetDefaultKind(TypeCategory::Character)}; 4211 } 4212 SetDeclTypeSpec(currScope().MakeCharacterType( 4213 std::move(*charInfo_.length), std::move(*charInfo_.kind))); 4214 charInfo_ = {}; 4215 } 4216 void DeclarationVisitor::Post(const parser::CharSelector::LengthAndKind &x) { 4217 charInfo_.kind = EvaluateSubscriptIntExpr(x.kind); 4218 std::optional<std::int64_t> intKind{ToInt64(charInfo_.kind)}; 4219 if (intKind && 4220 !evaluate::IsValidKindOfIntrinsicType( 4221 TypeCategory::Character, *intKind)) { // C715, C719 4222 Say(currStmtSource().value(), 4223 "KIND value (%jd) not valid for CHARACTER"_err_en_US, *intKind); 4224 charInfo_.kind = std::nullopt; // prevent further errors 4225 } 4226 if (x.length) { 4227 charInfo_.length = GetParamValue(*x.length, common::TypeParamAttr::Len); 4228 } 4229 } 4230 void DeclarationVisitor::Post(const parser::CharLength &x) { 4231 if (const auto *length{std::get_if<std::uint64_t>(&x.u)}) { 4232 charInfo_.length = ParamValue{ 4233 static_cast<ConstantSubscript>(*length), common::TypeParamAttr::Len}; 4234 } else { 4235 charInfo_.length = GetParamValue( 4236 std::get<parser::TypeParamValue>(x.u), common::TypeParamAttr::Len); 4237 } 4238 } 4239 void DeclarationVisitor::Post(const parser::LengthSelector &x) { 4240 if (const auto *param{std::get_if<parser::TypeParamValue>(&x.u)}) { 4241 charInfo_.length = GetParamValue(*param, common::TypeParamAttr::Len); 4242 } 4243 } 4244 4245 bool DeclarationVisitor::Pre(const parser::KindParam &x) { 4246 if (const auto *kind{std::get_if< 4247 parser::Scalar<parser::Integer<parser::Constant<parser::Name>>>>( 4248 &x.u)}) { 4249 const parser::Name &name{kind->thing.thing.thing}; 4250 if (!FindSymbol(name)) { 4251 Say(name, "Parameter '%s' not found"_err_en_US); 4252 } 4253 } 4254 return false; 4255 } 4256 4257 bool DeclarationVisitor::Pre(const parser::DeclarationTypeSpec::Type &) { 4258 CHECK(GetDeclTypeSpecCategory() == DeclTypeSpec::Category::TypeDerived); 4259 return true; 4260 } 4261 4262 void DeclarationVisitor::Post(const parser::DeclarationTypeSpec::Type &type) { 4263 const parser::Name &derivedName{std::get<parser::Name>(type.derived.t)}; 4264 if (const Symbol * derivedSymbol{derivedName.symbol}) { 4265 CheckForAbstractType(*derivedSymbol); // C706 4266 } 4267 } 4268 4269 bool DeclarationVisitor::Pre(const parser::DeclarationTypeSpec::Class &) { 4270 SetDeclTypeSpecCategory(DeclTypeSpec::Category::ClassDerived); 4271 return true; 4272 } 4273 4274 void DeclarationVisitor::Post( 4275 const parser::DeclarationTypeSpec::Class &parsedClass) { 4276 const auto &typeName{std::get<parser::Name>(parsedClass.derived.t)}; 4277 if (auto spec{ResolveDerivedType(typeName)}; 4278 spec && !IsExtensibleType(&*spec)) { // C705 4279 SayWithDecl(typeName, *typeName.symbol, 4280 "Non-extensible derived type '%s' may not be used with CLASS" 4281 " keyword"_err_en_US); 4282 } 4283 } 4284 4285 void DeclarationVisitor::Post(const parser::DerivedTypeSpec &x) { 4286 const auto &typeName{std::get<parser::Name>(x.t)}; 4287 auto spec{ResolveDerivedType(typeName)}; 4288 if (!spec) { 4289 return; 4290 } 4291 bool seenAnyName{false}; 4292 for (const auto &typeParamSpec : 4293 std::get<std::list<parser::TypeParamSpec>>(x.t)) { 4294 const auto &optKeyword{ 4295 std::get<std::optional<parser::Keyword>>(typeParamSpec.t)}; 4296 std::optional<SourceName> name; 4297 if (optKeyword) { 4298 seenAnyName = true; 4299 name = optKeyword->v.source; 4300 } else if (seenAnyName) { 4301 Say(typeName.source, "Type parameter value must have a name"_err_en_US); 4302 continue; 4303 } 4304 const auto &value{std::get<parser::TypeParamValue>(typeParamSpec.t)}; 4305 // The expressions in a derived type specifier whose values define 4306 // non-defaulted type parameters are evaluated (folded) in the enclosing 4307 // scope. The KIND/LEN distinction is resolved later in 4308 // DerivedTypeSpec::CookParameters(). 4309 ParamValue param{GetParamValue(value, common::TypeParamAttr::Kind)}; 4310 if (!param.isExplicit() || param.GetExplicit()) { 4311 spec->AddRawParamValue(optKeyword, std::move(param)); 4312 } 4313 } 4314 4315 // The DerivedTypeSpec *spec is used initially as a search key. 4316 // If it turns out to have the same name and actual parameter 4317 // value expressions as another DerivedTypeSpec in the current 4318 // scope does, then we'll use that extant spec; otherwise, when this 4319 // spec is distinct from all derived types previously instantiated 4320 // in the current scope, this spec will be moved into that collection. 4321 const auto &dtDetails{spec->typeSymbol().get<DerivedTypeDetails>()}; 4322 auto category{GetDeclTypeSpecCategory()}; 4323 if (dtDetails.isForwardReferenced()) { 4324 DeclTypeSpec &type{currScope().MakeDerivedType(category, std::move(*spec))}; 4325 SetDeclTypeSpec(type); 4326 return; 4327 } 4328 // Normalize parameters to produce a better search key. 4329 spec->CookParameters(GetFoldingContext()); 4330 if (!spec->MightBeParameterized()) { 4331 spec->EvaluateParameters(context()); 4332 } 4333 if (const DeclTypeSpec * 4334 extant{currScope().FindInstantiatedDerivedType(*spec, category)}) { 4335 // This derived type and parameter expressions (if any) are already present 4336 // in this scope. 4337 SetDeclTypeSpec(*extant); 4338 } else { 4339 DeclTypeSpec &type{currScope().MakeDerivedType(category, std::move(*spec))}; 4340 DerivedTypeSpec &derived{type.derivedTypeSpec()}; 4341 if (derived.MightBeParameterized() && 4342 currScope().IsParameterizedDerivedType()) { 4343 // Defer instantiation; use the derived type's definition's scope. 4344 derived.set_scope(DEREF(spec->typeSymbol().scope())); 4345 } else if (&currScope() == spec->typeSymbol().scope()) { 4346 // Direct recursive use of a type in the definition of one of its 4347 // components: defer instantiation 4348 } else { 4349 auto restorer{ 4350 GetFoldingContext().messages().SetLocation(currStmtSource().value())}; 4351 derived.Instantiate(currScope()); 4352 } 4353 SetDeclTypeSpec(type); 4354 } 4355 // Capture the DerivedTypeSpec in the parse tree for use in building 4356 // structure constructor expressions. 4357 x.derivedTypeSpec = &GetDeclTypeSpec()->derivedTypeSpec(); 4358 } 4359 4360 void DeclarationVisitor::Post(const parser::DeclarationTypeSpec::Record &rec) { 4361 const auto &typeName{rec.v}; 4362 if (auto spec{ResolveDerivedType(typeName)}) { 4363 spec->CookParameters(GetFoldingContext()); 4364 spec->EvaluateParameters(context()); 4365 if (const DeclTypeSpec * 4366 extant{currScope().FindInstantiatedDerivedType( 4367 *spec, DeclTypeSpec::TypeDerived)}) { 4368 SetDeclTypeSpec(*extant); 4369 } else { 4370 Say(typeName.source, "%s is not a known STRUCTURE"_err_en_US, 4371 typeName.source); 4372 } 4373 } 4374 } 4375 4376 // The descendents of DerivedTypeDef in the parse tree are visited directly 4377 // in this Pre() routine so that recursive use of the derived type can be 4378 // supported in the components. 4379 bool DeclarationVisitor::Pre(const parser::DerivedTypeDef &x) { 4380 auto &stmt{std::get<parser::Statement<parser::DerivedTypeStmt>>(x.t)}; 4381 Walk(stmt); 4382 Walk(std::get<std::list<parser::Statement<parser::TypeParamDefStmt>>>(x.t)); 4383 auto &scope{currScope()}; 4384 CHECK(scope.symbol()); 4385 CHECK(scope.symbol()->scope() == &scope); 4386 auto &details{scope.symbol()->get<DerivedTypeDetails>()}; 4387 details.set_isForwardReferenced(false); 4388 std::set<SourceName> paramNames; 4389 for (auto ¶mName : std::get<std::list<parser::Name>>(stmt.statement.t)) { 4390 details.add_paramName(paramName.source); 4391 auto *symbol{FindInScope(scope, paramName)}; 4392 if (!symbol) { 4393 Say(paramName, 4394 "No definition found for type parameter '%s'"_err_en_US); // C742 4395 // No symbol for a type param. Create one and mark it as containing an 4396 // error to improve subsequent semantic processing 4397 BeginAttrs(); 4398 Symbol *typeParam{MakeTypeSymbol( 4399 paramName, TypeParamDetails{common::TypeParamAttr::Len})}; 4400 context().SetError(*typeParam); 4401 EndAttrs(); 4402 } else if (!symbol->has<TypeParamDetails>()) { 4403 Say2(paramName, "'%s' is not defined as a type parameter"_err_en_US, 4404 *symbol, "Definition of '%s'"_en_US); // C741 4405 } 4406 if (!paramNames.insert(paramName.source).second) { 4407 Say(paramName, 4408 "Duplicate type parameter name: '%s'"_err_en_US); // C731 4409 } 4410 } 4411 for (const auto &[name, symbol] : currScope()) { 4412 if (symbol->has<TypeParamDetails>() && !paramNames.count(name)) { 4413 SayDerivedType(name, 4414 "'%s' is not a type parameter of this derived type"_err_en_US, 4415 currScope()); // C741 4416 } 4417 } 4418 Walk(std::get<std::list<parser::Statement<parser::PrivateOrSequence>>>(x.t)); 4419 const auto &componentDefs{ 4420 std::get<std::list<parser::Statement<parser::ComponentDefStmt>>>(x.t)}; 4421 Walk(componentDefs); 4422 if (derivedTypeInfo_.sequence) { 4423 details.set_sequence(true); 4424 if (componentDefs.empty()) { // C740 4425 Say(stmt.source, 4426 "A sequence type must have at least one component"_err_en_US); 4427 } 4428 if (!details.paramNames().empty()) { // C740 4429 Say(stmt.source, 4430 "A sequence type may not have type parameters"_err_en_US); 4431 } 4432 if (derivedTypeInfo_.extends) { // C735 4433 Say(stmt.source, 4434 "A sequence type may not have the EXTENDS attribute"_err_en_US); 4435 } 4436 } 4437 Walk(std::get<std::optional<parser::TypeBoundProcedurePart>>(x.t)); 4438 Walk(std::get<parser::Statement<parser::EndTypeStmt>>(x.t)); 4439 derivedTypeInfo_ = {}; 4440 PopScope(); 4441 return false; 4442 } 4443 4444 bool DeclarationVisitor::Pre(const parser::DerivedTypeStmt &) { 4445 return BeginAttrs(); 4446 } 4447 void DeclarationVisitor::Post(const parser::DerivedTypeStmt &x) { 4448 auto &name{std::get<parser::Name>(x.t)}; 4449 // Resolve the EXTENDS() clause before creating the derived 4450 // type's symbol to foil attempts to recursively extend a type. 4451 auto *extendsName{derivedTypeInfo_.extends}; 4452 std::optional<DerivedTypeSpec> extendsType{ 4453 ResolveExtendsType(name, extendsName)}; 4454 auto &symbol{MakeSymbol(name, GetAttrs(), DerivedTypeDetails{})}; 4455 symbol.ReplaceName(name.source); 4456 derivedTypeInfo_.type = &symbol; 4457 PushScope(Scope::Kind::DerivedType, &symbol); 4458 if (extendsType) { 4459 // Declare the "parent component"; private if the type is. 4460 // Any symbol stored in the EXTENDS() clause is temporarily 4461 // hidden so that a new symbol can be created for the parent 4462 // component without producing spurious errors about already 4463 // existing. 4464 const Symbol &extendsSymbol{extendsType->typeSymbol()}; 4465 auto restorer{common::ScopedSet(extendsName->symbol, nullptr)}; 4466 if (OkToAddComponent(*extendsName, &extendsSymbol)) { 4467 auto &comp{DeclareEntity<ObjectEntityDetails>(*extendsName, Attrs{})}; 4468 comp.attrs().set( 4469 Attr::PRIVATE, extendsSymbol.attrs().test(Attr::PRIVATE)); 4470 comp.set(Symbol::Flag::ParentComp); 4471 DeclTypeSpec &type{currScope().MakeDerivedType( 4472 DeclTypeSpec::TypeDerived, std::move(*extendsType))}; 4473 type.derivedTypeSpec().set_scope(*extendsSymbol.scope()); 4474 comp.SetType(type); 4475 DerivedTypeDetails &details{symbol.get<DerivedTypeDetails>()}; 4476 details.add_component(comp); 4477 } 4478 } 4479 EndAttrs(); 4480 } 4481 4482 void DeclarationVisitor::Post(const parser::TypeParamDefStmt &x) { 4483 auto *type{GetDeclTypeSpec()}; 4484 auto attr{std::get<common::TypeParamAttr>(x.t)}; 4485 for (auto &decl : std::get<std::list<parser::TypeParamDecl>>(x.t)) { 4486 auto &name{std::get<parser::Name>(decl.t)}; 4487 if (Symbol * symbol{MakeTypeSymbol(name, TypeParamDetails{attr})}) { 4488 SetType(name, *type); 4489 if (auto &init{ 4490 std::get<std::optional<parser::ScalarIntConstantExpr>>(decl.t)}) { 4491 if (auto maybeExpr{EvaluateNonPointerInitializer( 4492 *symbol, *init, init->thing.thing.thing.value().source)}) { 4493 if (auto *intExpr{std::get_if<SomeIntExpr>(&maybeExpr->u)}) { 4494 symbol->get<TypeParamDetails>().set_init(std::move(*intExpr)); 4495 } 4496 } 4497 } 4498 } 4499 } 4500 EndDecl(); 4501 } 4502 bool DeclarationVisitor::Pre(const parser::TypeAttrSpec::Extends &x) { 4503 if (derivedTypeInfo_.extends) { 4504 Say(currStmtSource().value(), 4505 "Attribute 'EXTENDS' cannot be used more than once"_err_en_US); 4506 } else { 4507 derivedTypeInfo_.extends = &x.v; 4508 } 4509 return false; 4510 } 4511 4512 bool DeclarationVisitor::Pre(const parser::PrivateStmt &) { 4513 if (!currScope().parent().IsModule()) { 4514 Say("PRIVATE is only allowed in a derived type that is" 4515 " in a module"_err_en_US); // C766 4516 } else if (derivedTypeInfo_.sawContains) { 4517 derivedTypeInfo_.privateBindings = true; 4518 } else if (!derivedTypeInfo_.privateComps) { 4519 derivedTypeInfo_.privateComps = true; 4520 } else { 4521 Say("PRIVATE may not appear more than once in" 4522 " derived type components"_warn_en_US); // C738 4523 } 4524 return false; 4525 } 4526 bool DeclarationVisitor::Pre(const parser::SequenceStmt &) { 4527 if (derivedTypeInfo_.sequence) { 4528 Say("SEQUENCE may not appear more than once in" 4529 " derived type components"_warn_en_US); // C738 4530 } 4531 derivedTypeInfo_.sequence = true; 4532 return false; 4533 } 4534 void DeclarationVisitor::Post(const parser::ComponentDecl &x) { 4535 const auto &name{std::get<parser::Name>(x.t)}; 4536 auto attrs{GetAttrs()}; 4537 if (derivedTypeInfo_.privateComps && 4538 !attrs.HasAny({Attr::PUBLIC, Attr::PRIVATE})) { 4539 attrs.set(Attr::PRIVATE); 4540 } 4541 if (const auto *declType{GetDeclTypeSpec()}) { 4542 if (const auto *derived{declType->AsDerived()}) { 4543 if (!attrs.HasAny({Attr::POINTER, Attr::ALLOCATABLE})) { 4544 if (derivedTypeInfo_.type == &derived->typeSymbol()) { // C744 4545 Say("Recursive use of the derived type requires " 4546 "POINTER or ALLOCATABLE"_err_en_US); 4547 } 4548 } 4549 // TODO: This would be more appropriate in CheckDerivedType() 4550 if (auto it{FindCoarrayUltimateComponent(*derived)}) { // C748 4551 std::string ultimateName{it.BuildResultDesignatorName()}; 4552 // Strip off the leading "%" 4553 if (ultimateName.length() > 1) { 4554 ultimateName.erase(0, 1); 4555 if (attrs.HasAny({Attr::POINTER, Attr::ALLOCATABLE})) { 4556 evaluate::AttachDeclaration( 4557 Say(name.source, 4558 "A component with a POINTER or ALLOCATABLE attribute may " 4559 "not " 4560 "be of a type with a coarray ultimate component (named " 4561 "'%s')"_err_en_US, 4562 ultimateName), 4563 derived->typeSymbol()); 4564 } 4565 if (!arraySpec().empty() || !coarraySpec().empty()) { 4566 evaluate::AttachDeclaration( 4567 Say(name.source, 4568 "An array or coarray component may not be of a type with a " 4569 "coarray ultimate component (named '%s')"_err_en_US, 4570 ultimateName), 4571 derived->typeSymbol()); 4572 } 4573 } 4574 } 4575 } 4576 } 4577 if (OkToAddComponent(name)) { 4578 auto &symbol{DeclareObjectEntity(name, attrs)}; 4579 if (symbol.has<ObjectEntityDetails>()) { 4580 if (auto &init{std::get<std::optional<parser::Initialization>>(x.t)}) { 4581 Initialization(name, *init, true); 4582 } 4583 } 4584 currScope().symbol()->get<DerivedTypeDetails>().add_component(symbol); 4585 } 4586 ClearArraySpec(); 4587 ClearCoarraySpec(); 4588 } 4589 void DeclarationVisitor::Post(const parser::FillDecl &x) { 4590 // Replace "%FILL" with a distinct generated name 4591 const auto &name{std::get<parser::Name>(x.t)}; 4592 const_cast<SourceName &>(name.source) = context().GetTempName(currScope()); 4593 if (OkToAddComponent(name)) { 4594 auto &symbol{DeclareObjectEntity(name, GetAttrs())}; 4595 currScope().symbol()->get<DerivedTypeDetails>().add_component(symbol); 4596 } 4597 ClearArraySpec(); 4598 } 4599 bool DeclarationVisitor::Pre(const parser::ProcedureDeclarationStmt &) { 4600 CHECK(!interfaceName_); 4601 return BeginDecl(); 4602 } 4603 void DeclarationVisitor::Post(const parser::ProcedureDeclarationStmt &) { 4604 interfaceName_ = nullptr; 4605 EndDecl(); 4606 } 4607 bool DeclarationVisitor::Pre(const parser::DataComponentDefStmt &x) { 4608 // Overrides parse tree traversal so as to handle attributes first, 4609 // so POINTER & ALLOCATABLE enable forward references to derived types. 4610 Walk(std::get<std::list<parser::ComponentAttrSpec>>(x.t)); 4611 set_allowForwardReferenceToDerivedType( 4612 GetAttrs().HasAny({Attr::POINTER, Attr::ALLOCATABLE})); 4613 Walk(std::get<parser::DeclarationTypeSpec>(x.t)); 4614 set_allowForwardReferenceToDerivedType(false); 4615 if (derivedTypeInfo_.sequence) { // C740 4616 if (const auto *declType{GetDeclTypeSpec()}) { 4617 if (!declType->AsIntrinsic() && !declType->IsSequenceType()) { 4618 if (GetAttrs().test(Attr::POINTER) && 4619 context().IsEnabled(common::LanguageFeature::PointerInSeqType)) { 4620 if (context().ShouldWarn(common::LanguageFeature::PointerInSeqType)) { 4621 Say("A sequence type data component that is a pointer to a non-sequence type is not standard"_port_en_US); 4622 } 4623 } else { 4624 Say("A sequence type data component must either be of an intrinsic type or a derived sequence type"_err_en_US); 4625 } 4626 } 4627 } 4628 } 4629 Walk(std::get<std::list<parser::ComponentOrFill>>(x.t)); 4630 return false; 4631 } 4632 bool DeclarationVisitor::Pre(const parser::ProcComponentDefStmt &) { 4633 CHECK(!interfaceName_); 4634 return true; 4635 } 4636 void DeclarationVisitor::Post(const parser::ProcComponentDefStmt &) { 4637 interfaceName_ = nullptr; 4638 } 4639 bool DeclarationVisitor::Pre(const parser::ProcPointerInit &x) { 4640 if (auto *name{std::get_if<parser::Name>(&x.u)}) { 4641 return !NameIsKnownOrIntrinsic(*name); 4642 } 4643 return true; 4644 } 4645 void DeclarationVisitor::Post(const parser::ProcInterface &x) { 4646 if (auto *name{std::get_if<parser::Name>(&x.u)}) { 4647 interfaceName_ = name; 4648 NoteInterfaceName(*name); 4649 } 4650 } 4651 void DeclarationVisitor::Post(const parser::ProcDecl &x) { 4652 const auto &name{std::get<parser::Name>(x.t)}; 4653 ProcInterface interface; 4654 if (interfaceName_) { 4655 interface.set_symbol(*interfaceName_->symbol); 4656 } else if (auto *type{GetDeclTypeSpec()}) { 4657 interface.set_type(*type); 4658 } 4659 auto attrs{HandleSaveName(name.source, GetAttrs())}; 4660 DerivedTypeDetails *dtDetails{nullptr}; 4661 if (Symbol * symbol{currScope().symbol()}) { 4662 dtDetails = symbol->detailsIf<DerivedTypeDetails>(); 4663 } 4664 if (!dtDetails) { 4665 attrs.set(Attr::EXTERNAL); 4666 } 4667 Symbol &symbol{DeclareProcEntity(name, attrs, interface)}; 4668 symbol.ReplaceName(name.source); 4669 if (dtDetails) { 4670 dtDetails->add_component(symbol); 4671 } 4672 } 4673 4674 bool DeclarationVisitor::Pre(const parser::TypeBoundProcedurePart &) { 4675 derivedTypeInfo_.sawContains = true; 4676 return true; 4677 } 4678 4679 // Resolve binding names from type-bound generics, saved in genericBindings_. 4680 void DeclarationVisitor::Post(const parser::TypeBoundProcedurePart &) { 4681 // track specifics seen for the current generic to detect duplicates: 4682 const Symbol *currGeneric{nullptr}; 4683 std::set<SourceName> specifics; 4684 for (const auto &[generic, bindingName] : genericBindings_) { 4685 if (generic != currGeneric) { 4686 currGeneric = generic; 4687 specifics.clear(); 4688 } 4689 auto [it, inserted]{specifics.insert(bindingName->source)}; 4690 if (!inserted) { 4691 Say(*bindingName, // C773 4692 "Binding name '%s' was already specified for generic '%s'"_err_en_US, 4693 bindingName->source, generic->name()) 4694 .Attach(*it, "Previous specification of '%s'"_en_US, *it); 4695 continue; 4696 } 4697 auto *symbol{FindInTypeOrParents(*bindingName)}; 4698 if (!symbol) { 4699 Say(*bindingName, // C772 4700 "Binding name '%s' not found in this derived type"_err_en_US); 4701 } else if (!symbol->has<ProcBindingDetails>()) { 4702 SayWithDecl(*bindingName, *symbol, // C772 4703 "'%s' is not the name of a specific binding of this type"_err_en_US); 4704 } else { 4705 generic->get<GenericDetails>().AddSpecificProc( 4706 *symbol, bindingName->source); 4707 } 4708 } 4709 genericBindings_.clear(); 4710 } 4711 4712 void DeclarationVisitor::Post(const parser::ContainsStmt &) { 4713 if (derivedTypeInfo_.sequence) { 4714 Say("A sequence type may not have a CONTAINS statement"_err_en_US); // C740 4715 } 4716 } 4717 4718 void DeclarationVisitor::Post( 4719 const parser::TypeBoundProcedureStmt::WithoutInterface &x) { 4720 if (GetAttrs().test(Attr::DEFERRED)) { // C783 4721 Say("DEFERRED is only allowed when an interface-name is provided"_err_en_US); 4722 } 4723 for (auto &declaration : x.declarations) { 4724 auto &bindingName{std::get<parser::Name>(declaration.t)}; 4725 auto &optName{std::get<std::optional<parser::Name>>(declaration.t)}; 4726 const parser::Name &procedureName{optName ? *optName : bindingName}; 4727 Symbol *procedure{FindSymbol(procedureName)}; 4728 if (!procedure) { 4729 procedure = NoteInterfaceName(procedureName); 4730 } 4731 if (auto *s{MakeTypeSymbol(bindingName, ProcBindingDetails{*procedure})}) { 4732 SetPassNameOn(*s); 4733 if (GetAttrs().test(Attr::DEFERRED)) { 4734 context().SetError(*s); 4735 } 4736 } 4737 } 4738 } 4739 4740 void DeclarationVisitor::CheckBindings( 4741 const parser::TypeBoundProcedureStmt::WithoutInterface &tbps) { 4742 CHECK(currScope().IsDerivedType()); 4743 for (auto &declaration : tbps.declarations) { 4744 auto &bindingName{std::get<parser::Name>(declaration.t)}; 4745 if (Symbol * binding{FindInScope(bindingName)}) { 4746 if (auto *details{binding->detailsIf<ProcBindingDetails>()}) { 4747 const Symbol *procedure{FindSubprogram(details->symbol())}; 4748 if (!CanBeTypeBoundProc(procedure)) { 4749 if (details->symbol().name() != binding->name()) { 4750 Say(binding->name(), 4751 "The binding of '%s' ('%s') must be either an accessible " 4752 "module procedure or an external procedure with " 4753 "an explicit interface"_err_en_US, 4754 binding->name(), details->symbol().name()); 4755 } else { 4756 Say(binding->name(), 4757 "'%s' must be either an accessible module procedure " 4758 "or an external procedure with an explicit interface"_err_en_US, 4759 binding->name()); 4760 } 4761 context().SetError(*binding); 4762 } 4763 } 4764 } 4765 } 4766 } 4767 4768 void DeclarationVisitor::Post( 4769 const parser::TypeBoundProcedureStmt::WithInterface &x) { 4770 if (!GetAttrs().test(Attr::DEFERRED)) { // C783 4771 Say("DEFERRED is required when an interface-name is provided"_err_en_US); 4772 } 4773 if (Symbol * interface{NoteInterfaceName(x.interfaceName)}) { 4774 for (auto &bindingName : x.bindingNames) { 4775 if (auto *s{ 4776 MakeTypeSymbol(bindingName, ProcBindingDetails{*interface})}) { 4777 SetPassNameOn(*s); 4778 if (!GetAttrs().test(Attr::DEFERRED)) { 4779 context().SetError(*s); 4780 } 4781 } 4782 } 4783 } 4784 } 4785 4786 void DeclarationVisitor::Post(const parser::FinalProcedureStmt &x) { 4787 if (currScope().IsDerivedType() && currScope().symbol()) { 4788 if (auto *details{currScope().symbol()->detailsIf<DerivedTypeDetails>()}) { 4789 for (const auto &subrName : x.v) { 4790 if (const auto *name{ResolveName(subrName)}) { 4791 auto pair{ 4792 details->finals().emplace(name->source, DEREF(name->symbol))}; 4793 if (!pair.second) { // C787 4794 Say(name->source, 4795 "FINAL subroutine '%s' already appeared in this derived type"_err_en_US, 4796 name->source) 4797 .Attach(pair.first->first, 4798 "earlier appearance of this FINAL subroutine"_en_US); 4799 } 4800 } 4801 } 4802 } 4803 } 4804 } 4805 4806 bool DeclarationVisitor::Pre(const parser::TypeBoundGenericStmt &x) { 4807 const auto &accessSpec{std::get<std::optional<parser::AccessSpec>>(x.t)}; 4808 const auto &genericSpec{std::get<Indirection<parser::GenericSpec>>(x.t)}; 4809 const auto &bindingNames{std::get<std::list<parser::Name>>(x.t)}; 4810 auto info{GenericSpecInfo{genericSpec.value()}}; 4811 SourceName symbolName{info.symbolName()}; 4812 bool isPrivate{accessSpec ? accessSpec->v == parser::AccessSpec::Kind::Private 4813 : derivedTypeInfo_.privateBindings}; 4814 auto *genericSymbol{FindInScope(symbolName)}; 4815 if (genericSymbol) { 4816 if (!genericSymbol->has<GenericDetails>()) { 4817 genericSymbol = nullptr; // MakeTypeSymbol will report the error below 4818 } 4819 } else { 4820 // look in parent types: 4821 Symbol *inheritedSymbol{nullptr}; 4822 for (const auto &name : GetAllNames(context(), symbolName)) { 4823 inheritedSymbol = currScope().FindComponent(SourceName{name}); 4824 if (inheritedSymbol) { 4825 break; 4826 } 4827 } 4828 if (inheritedSymbol && inheritedSymbol->has<GenericDetails>()) { 4829 CheckAccessibility(symbolName, isPrivate, *inheritedSymbol); // C771 4830 } 4831 } 4832 if (genericSymbol) { 4833 CheckAccessibility(symbolName, isPrivate, *genericSymbol); // C771 4834 } else { 4835 genericSymbol = MakeTypeSymbol(symbolName, GenericDetails{}); 4836 if (!genericSymbol) { 4837 return false; 4838 } 4839 if (isPrivate) { 4840 genericSymbol->attrs().set(Attr::PRIVATE); 4841 } 4842 } 4843 for (const parser::Name &bindingName : bindingNames) { 4844 genericBindings_.emplace(genericSymbol, &bindingName); 4845 } 4846 info.Resolve(genericSymbol); 4847 return false; 4848 } 4849 4850 // DEC STRUCTUREs are handled thus to allow for nested definitions. 4851 bool DeclarationVisitor::Pre(const parser::StructureDef &def) { 4852 const auto &structureStatement{ 4853 std::get<parser::Statement<parser::StructureStmt>>(def.t)}; 4854 auto saveDerivedTypeInfo{derivedTypeInfo_}; 4855 derivedTypeInfo_ = {}; 4856 derivedTypeInfo_.isStructure = true; 4857 derivedTypeInfo_.sequence = true; 4858 Scope *previousStructure{nullptr}; 4859 if (saveDerivedTypeInfo.isStructure) { 4860 previousStructure = &currScope(); 4861 PopScope(); 4862 } 4863 const parser::StructureStmt &structStmt{structureStatement.statement}; 4864 const auto &name{std::get<std::optional<parser::Name>>(structStmt.t)}; 4865 if (!name) { 4866 // Construct a distinct generated name for an anonymous structure 4867 auto &mutableName{const_cast<std::optional<parser::Name> &>(name)}; 4868 mutableName.emplace( 4869 parser::Name{context().GetTempName(currScope()), nullptr}); 4870 } 4871 auto &symbol{MakeSymbol(*name, DerivedTypeDetails{})}; 4872 symbol.ReplaceName(name->source); 4873 symbol.get<DerivedTypeDetails>().set_sequence(true); 4874 symbol.get<DerivedTypeDetails>().set_isDECStructure(true); 4875 derivedTypeInfo_.type = &symbol; 4876 PushScope(Scope::Kind::DerivedType, &symbol); 4877 const auto &fields{std::get<std::list<parser::StructureField>>(def.t)}; 4878 Walk(fields); 4879 PopScope(); 4880 // Complete the definition 4881 DerivedTypeSpec derivedTypeSpec{symbol.name(), symbol}; 4882 derivedTypeSpec.set_scope(DEREF(symbol.scope())); 4883 derivedTypeSpec.CookParameters(GetFoldingContext()); 4884 derivedTypeSpec.EvaluateParameters(context()); 4885 DeclTypeSpec &type{currScope().MakeDerivedType( 4886 DeclTypeSpec::TypeDerived, std::move(derivedTypeSpec))}; 4887 type.derivedTypeSpec().Instantiate(currScope()); 4888 // Restore previous structure definition context, if any 4889 derivedTypeInfo_ = saveDerivedTypeInfo; 4890 if (previousStructure) { 4891 PushScope(*previousStructure); 4892 } 4893 // Handle any entity declarations on the STRUCTURE statement 4894 const auto &decls{std::get<std::list<parser::EntityDecl>>(structStmt.t)}; 4895 if (!decls.empty()) { 4896 BeginDecl(); 4897 SetDeclTypeSpec(type); 4898 Walk(decls); 4899 EndDecl(); 4900 } 4901 return false; 4902 } 4903 4904 bool DeclarationVisitor::Pre(const parser::Union::UnionStmt &) { 4905 Say("support for UNION"_todo_en_US); // TODO 4906 return true; 4907 } 4908 4909 bool DeclarationVisitor::Pre(const parser::StructureField &x) { 4910 if (std::holds_alternative<parser::Statement<parser::DataComponentDefStmt>>( 4911 x.u)) { 4912 BeginDecl(); 4913 } 4914 return true; 4915 } 4916 4917 void DeclarationVisitor::Post(const parser::StructureField &x) { 4918 if (std::holds_alternative<parser::Statement<parser::DataComponentDefStmt>>( 4919 x.u)) { 4920 EndDecl(); 4921 } 4922 } 4923 4924 bool DeclarationVisitor::Pre(const parser::AllocateStmt &) { 4925 BeginDeclTypeSpec(); 4926 return true; 4927 } 4928 void DeclarationVisitor::Post(const parser::AllocateStmt &) { 4929 EndDeclTypeSpec(); 4930 } 4931 4932 bool DeclarationVisitor::Pre(const parser::StructureConstructor &x) { 4933 auto &parsedType{std::get<parser::DerivedTypeSpec>(x.t)}; 4934 const DeclTypeSpec *type{ProcessTypeSpec(parsedType)}; 4935 if (!type) { 4936 return false; 4937 } 4938 const DerivedTypeSpec *spec{type->AsDerived()}; 4939 const Scope *typeScope{spec ? spec->scope() : nullptr}; 4940 if (!typeScope) { 4941 return false; 4942 } 4943 4944 // N.B C7102 is implicitly enforced by having inaccessible types not 4945 // being found in resolution. 4946 // More constraints are enforced in expression.cpp so that they 4947 // can apply to structure constructors that have been converted 4948 // from misparsed function references. 4949 for (const auto &component : 4950 std::get<std::list<parser::ComponentSpec>>(x.t)) { 4951 // Visit the component spec expression, but not the keyword, since 4952 // we need to resolve its symbol in the scope of the derived type. 4953 Walk(std::get<parser::ComponentDataSource>(component.t)); 4954 if (const auto &kw{std::get<std::optional<parser::Keyword>>(component.t)}) { 4955 FindInTypeOrParents(*typeScope, kw->v); 4956 } 4957 } 4958 return false; 4959 } 4960 4961 bool DeclarationVisitor::Pre(const parser::BasedPointerStmt &x) { 4962 for (const parser::BasedPointer &bp : x.v) { 4963 const parser::ObjectName &pointerName{std::get<0>(bp.t)}; 4964 const parser::ObjectName &pointeeName{std::get<1>(bp.t)}; 4965 auto *pointer{FindSymbol(pointerName)}; 4966 if (!pointer) { 4967 pointer = &MakeSymbol(pointerName, ObjectEntityDetails{}); 4968 } else if (!ConvertToObjectEntity(*pointer) || IsNamedConstant(*pointer)) { 4969 SayWithDecl(pointerName, *pointer, "'%s' is not a variable"_err_en_US); 4970 } else if (pointer->Rank() > 0) { 4971 SayWithDecl(pointerName, *pointer, 4972 "Cray pointer '%s' must be a scalar"_err_en_US); 4973 } else if (pointer->test(Symbol::Flag::CrayPointee)) { 4974 Say(pointerName, 4975 "'%s' cannot be a Cray pointer as it is already a Cray pointee"_err_en_US); 4976 } 4977 pointer->set(Symbol::Flag::CrayPointer); 4978 const DeclTypeSpec &pointerType{MakeNumericType(TypeCategory::Integer, 4979 context().defaultKinds().subscriptIntegerKind())}; 4980 const auto *type{pointer->GetType()}; 4981 if (!type) { 4982 pointer->SetType(pointerType); 4983 } else if (*type != pointerType) { 4984 Say(pointerName.source, "Cray pointer '%s' must have type %s"_err_en_US, 4985 pointerName.source, pointerType.AsFortran()); 4986 } 4987 if (ResolveName(pointeeName)) { 4988 Symbol &pointee{*pointeeName.symbol}; 4989 if (pointee.has<UseDetails>()) { 4990 Say(pointeeName, 4991 "'%s' cannot be a Cray pointee as it is use-associated"_err_en_US); 4992 continue; 4993 } else if (!ConvertToObjectEntity(pointee) || IsNamedConstant(pointee)) { 4994 Say(pointeeName, "'%s' is not a variable"_err_en_US); 4995 continue; 4996 } else if (pointee.test(Symbol::Flag::CrayPointer)) { 4997 Say(pointeeName, 4998 "'%s' cannot be a Cray pointee as it is already a Cray pointer"_err_en_US); 4999 } else if (pointee.test(Symbol::Flag::CrayPointee)) { 5000 Say(pointeeName, 5001 "'%s' was already declared as a Cray pointee"_err_en_US); 5002 } else { 5003 pointee.set(Symbol::Flag::CrayPointee); 5004 } 5005 if (const auto *pointeeType{pointee.GetType()}) { 5006 if (const auto *derived{pointeeType->AsDerived()}) { 5007 if (!derived->typeSymbol().get<DerivedTypeDetails>().sequence()) { 5008 Say(pointeeName, 5009 "Type of Cray pointee '%s' is a non-sequence derived type"_err_en_US); 5010 } 5011 } 5012 } 5013 // process the pointee array-spec, if present 5014 BeginArraySpec(); 5015 Walk(std::get<std::optional<parser::ArraySpec>>(bp.t)); 5016 const auto &spec{arraySpec()}; 5017 if (!spec.empty()) { 5018 auto &details{pointee.get<ObjectEntityDetails>()}; 5019 if (details.shape().empty()) { 5020 details.set_shape(spec); 5021 } else { 5022 SayWithDecl(pointeeName, pointee, 5023 "Array spec was already declared for '%s'"_err_en_US); 5024 } 5025 } 5026 ClearArraySpec(); 5027 currScope().add_crayPointer(pointeeName.source, *pointer); 5028 } 5029 } 5030 return false; 5031 } 5032 5033 bool DeclarationVisitor::Pre(const parser::NamelistStmt::Group &x) { 5034 if (!CheckNotInBlock("NAMELIST")) { // C1107 5035 return false; 5036 } 5037 const auto &groupName{std::get<parser::Name>(x.t)}; 5038 auto *groupSymbol{FindInScope(groupName)}; 5039 if (!groupSymbol || !groupSymbol->has<NamelistDetails>()) { 5040 groupSymbol = &MakeSymbol(groupName, NamelistDetails{}); 5041 groupSymbol->ReplaceName(groupName.source); 5042 } 5043 // Name resolution of group items is deferred to FinishNamelists() 5044 // so that host association is handled correctly. 5045 GetDeferredDeclarationState(true)->namelistGroups.emplace_back(&x); 5046 return false; 5047 } 5048 5049 void DeclarationVisitor::FinishNamelists() { 5050 if (auto *deferred{GetDeferredDeclarationState()}) { 5051 for (const parser::NamelistStmt::Group *group : deferred->namelistGroups) { 5052 if (auto *groupSymbol{FindInScope(std::get<parser::Name>(group->t))}) { 5053 if (auto *details{groupSymbol->detailsIf<NamelistDetails>()}) { 5054 for (const auto &name : std::get<std::list<parser::Name>>(group->t)) { 5055 auto *symbol{FindSymbol(name)}; 5056 if (!symbol) { 5057 symbol = &MakeSymbol(name, ObjectEntityDetails{}); 5058 ApplyImplicitRules(*symbol); 5059 } else if (!ConvertToObjectEntity(*symbol)) { 5060 SayWithDecl(name, *symbol, "'%s' is not a variable"_err_en_US); 5061 } 5062 symbol->GetUltimate().set(Symbol::Flag::InNamelist); 5063 details->add_object(*symbol); 5064 } 5065 } 5066 } 5067 } 5068 deferred->namelistGroups.clear(); 5069 } 5070 } 5071 5072 bool DeclarationVisitor::Pre(const parser::IoControlSpec &x) { 5073 if (const auto *name{std::get_if<parser::Name>(&x.u)}) { 5074 auto *symbol{FindSymbol(*name)}; 5075 if (!symbol) { 5076 Say(*name, "Namelist group '%s' not found"_err_en_US); 5077 } else if (!symbol->GetUltimate().has<NamelistDetails>()) { 5078 SayWithDecl( 5079 *name, *symbol, "'%s' is not the name of a namelist group"_err_en_US); 5080 } 5081 } 5082 return true; 5083 } 5084 5085 bool DeclarationVisitor::Pre(const parser::CommonStmt::Block &x) { 5086 CheckNotInBlock("COMMON"); // C1107 5087 return true; 5088 } 5089 5090 bool DeclarationVisitor::Pre(const parser::CommonBlockObject &) { 5091 BeginArraySpec(); 5092 return true; 5093 } 5094 5095 void DeclarationVisitor::Post(const parser::CommonBlockObject &x) { 5096 const auto &name{std::get<parser::Name>(x.t)}; 5097 DeclareObjectEntity(name); 5098 auto pair{specPartState_.commonBlockObjects.insert(name.source)}; 5099 if (!pair.second) { 5100 const SourceName &prev{*pair.first}; 5101 Say2(name.source, "'%s' is already in a COMMON block"_err_en_US, prev, 5102 "Previous occurrence of '%s' in a COMMON block"_en_US); 5103 } 5104 } 5105 5106 bool DeclarationVisitor::Pre(const parser::EquivalenceStmt &x) { 5107 // save equivalence sets to be processed after specification part 5108 if (CheckNotInBlock("EQUIVALENCE")) { // C1107 5109 for (const std::list<parser::EquivalenceObject> &set : x.v) { 5110 specPartState_.equivalenceSets.push_back(&set); 5111 } 5112 } 5113 return false; // don't implicitly declare names yet 5114 } 5115 5116 void DeclarationVisitor::CheckEquivalenceSets() { 5117 EquivalenceSets equivSets{context()}; 5118 inEquivalenceStmt_ = true; 5119 for (const auto *set : specPartState_.equivalenceSets) { 5120 const auto &source{set->front().v.value().source}; 5121 if (set->size() <= 1) { // R871 5122 Say(source, "Equivalence set must have more than one object"_err_en_US); 5123 } 5124 for (const parser::EquivalenceObject &object : *set) { 5125 const auto &designator{object.v.value()}; 5126 // The designator was not resolved when it was encountered so do it now. 5127 // AnalyzeExpr causes array sections to be changed to substrings as needed 5128 Walk(designator); 5129 if (AnalyzeExpr(context(), designator)) { 5130 equivSets.AddToSet(designator); 5131 } 5132 } 5133 equivSets.FinishSet(source); 5134 } 5135 inEquivalenceStmt_ = false; 5136 for (auto &set : equivSets.sets()) { 5137 if (!set.empty()) { 5138 currScope().add_equivalenceSet(std::move(set)); 5139 } 5140 } 5141 specPartState_.equivalenceSets.clear(); 5142 } 5143 5144 bool DeclarationVisitor::Pre(const parser::SaveStmt &x) { 5145 if (x.v.empty()) { 5146 specPartState_.saveInfo.saveAll = currStmtSource(); 5147 currScope().set_hasSAVE(); 5148 } else { 5149 for (const parser::SavedEntity &y : x.v) { 5150 auto kind{std::get<parser::SavedEntity::Kind>(y.t)}; 5151 const auto &name{std::get<parser::Name>(y.t)}; 5152 if (kind == parser::SavedEntity::Kind::Common) { 5153 MakeCommonBlockSymbol(name); 5154 AddSaveName(specPartState_.saveInfo.commons, name.source); 5155 } else { 5156 HandleAttributeStmt(Attr::SAVE, name); 5157 } 5158 } 5159 } 5160 return false; 5161 } 5162 5163 void DeclarationVisitor::CheckSaveStmts() { 5164 for (const SourceName &name : specPartState_.saveInfo.entities) { 5165 auto *symbol{FindInScope(name)}; 5166 if (!symbol) { 5167 // error was reported 5168 } else if (specPartState_.saveInfo.saveAll) { 5169 // C889 - note that pgi, ifort, xlf do not enforce this constraint 5170 Say2(name, 5171 "Explicit SAVE of '%s' is redundant due to global SAVE statement"_err_en_US, 5172 *specPartState_.saveInfo.saveAll, "Global SAVE statement"_en_US); 5173 } else if (auto msg{CheckSaveAttr(*symbol)}) { 5174 Say(name, std::move(*msg)); 5175 context().SetError(*symbol); 5176 } else { 5177 SetSaveAttr(*symbol); 5178 } 5179 } 5180 for (const SourceName &name : specPartState_.saveInfo.commons) { 5181 if (auto *symbol{currScope().FindCommonBlock(name)}) { 5182 auto &objects{symbol->get<CommonBlockDetails>().objects()}; 5183 if (objects.empty()) { 5184 if (currScope().kind() != Scope::Kind::Block) { 5185 Say(name, 5186 "'%s' appears as a COMMON block in a SAVE statement but not in" 5187 " a COMMON statement"_err_en_US); 5188 } else { // C1108 5189 Say(name, 5190 "SAVE statement in BLOCK construct may not contain a" 5191 " common block name '%s'"_err_en_US); 5192 } 5193 } else { 5194 for (auto &object : symbol->get<CommonBlockDetails>().objects()) { 5195 SetSaveAttr(*object); 5196 } 5197 } 5198 } 5199 } 5200 if (specPartState_.saveInfo.saveAll) { 5201 // Apply SAVE attribute to applicable symbols 5202 for (auto pair : currScope()) { 5203 auto &symbol{*pair.second}; 5204 if (!CheckSaveAttr(symbol)) { 5205 SetSaveAttr(symbol); 5206 } 5207 } 5208 } 5209 specPartState_.saveInfo = {}; 5210 } 5211 5212 // If SAVE attribute can't be set on symbol, return error message. 5213 std::optional<MessageFixedText> DeclarationVisitor::CheckSaveAttr( 5214 const Symbol &symbol) { 5215 if (IsDummy(symbol)) { 5216 return "SAVE attribute may not be applied to dummy argument '%s'"_err_en_US; 5217 } else if (symbol.IsFuncResult()) { 5218 return "SAVE attribute may not be applied to function result '%s'"_err_en_US; 5219 } else if (symbol.has<ProcEntityDetails>() && 5220 !symbol.attrs().test(Attr::POINTER)) { 5221 return "Procedure '%s' with SAVE attribute must also have POINTER attribute"_err_en_US; 5222 } else if (IsAutomatic(symbol)) { 5223 return "SAVE attribute may not be applied to automatic data object '%s'"_err_en_US; 5224 } else { 5225 return std::nullopt; 5226 } 5227 } 5228 5229 // Record SAVEd names in specPartState_.saveInfo.entities. 5230 Attrs DeclarationVisitor::HandleSaveName(const SourceName &name, Attrs attrs) { 5231 if (attrs.test(Attr::SAVE)) { 5232 AddSaveName(specPartState_.saveInfo.entities, name); 5233 } 5234 return attrs; 5235 } 5236 5237 // Record a name in a set of those to be saved. 5238 void DeclarationVisitor::AddSaveName( 5239 std::set<SourceName> &set, const SourceName &name) { 5240 auto pair{set.insert(name)}; 5241 if (!pair.second) { 5242 Say2(name, "SAVE attribute was already specified on '%s'"_warn_en_US, 5243 *pair.first, "Previous specification of SAVE attribute"_en_US); 5244 } 5245 } 5246 5247 // Set the SAVE attribute on symbol unless it is implicitly saved anyway. 5248 void DeclarationVisitor::SetSaveAttr(Symbol &symbol) { 5249 if (!IsSaved(symbol)) { 5250 symbol.attrs().set(Attr::SAVE); 5251 } 5252 } 5253 5254 // Check types of common block objects, now that they are known. 5255 void DeclarationVisitor::CheckCommonBlocks() { 5256 // check for empty common blocks 5257 for (const auto &pair : currScope().commonBlocks()) { 5258 const auto &symbol{*pair.second}; 5259 if (symbol.get<CommonBlockDetails>().objects().empty() && 5260 symbol.attrs().test(Attr::BIND_C)) { 5261 Say(symbol.name(), 5262 "'%s' appears as a COMMON block in a BIND statement but not in" 5263 " a COMMON statement"_err_en_US); 5264 } 5265 } 5266 // check objects in common blocks 5267 for (const auto &name : specPartState_.commonBlockObjects) { 5268 const auto *symbol{currScope().FindSymbol(name)}; 5269 if (!symbol) { 5270 continue; 5271 } 5272 const auto &attrs{symbol->attrs()}; 5273 if (attrs.test(Attr::ALLOCATABLE)) { 5274 Say(name, 5275 "ALLOCATABLE object '%s' may not appear in a COMMON block"_err_en_US); 5276 } else if (attrs.test(Attr::BIND_C)) { 5277 Say(name, 5278 "Variable '%s' with BIND attribute may not appear in a COMMON block"_err_en_US); 5279 } else if (IsDummy(*symbol)) { 5280 Say(name, 5281 "Dummy argument '%s' may not appear in a COMMON block"_err_en_US); 5282 } else if (symbol->IsFuncResult()) { 5283 Say(name, 5284 "Function result '%s' may not appear in a COMMON block"_err_en_US); 5285 } else if (const DeclTypeSpec * type{symbol->GetType()}) { 5286 if (type->category() == DeclTypeSpec::ClassStar) { 5287 Say(name, 5288 "Unlimited polymorphic pointer '%s' may not appear in a COMMON block"_err_en_US); 5289 } else if (const auto *derived{type->AsDerived()}) { 5290 auto &typeSymbol{derived->typeSymbol()}; 5291 if (!typeSymbol.attrs().test(Attr::BIND_C) && 5292 !typeSymbol.get<DerivedTypeDetails>().sequence()) { 5293 Say(name, 5294 "Derived type '%s' in COMMON block must have the BIND or" 5295 " SEQUENCE attribute"_err_en_US); 5296 } 5297 CheckCommonBlockDerivedType(name, typeSymbol); 5298 } 5299 } 5300 } 5301 specPartState_.commonBlockObjects = {}; 5302 } 5303 5304 Symbol &DeclarationVisitor::MakeCommonBlockSymbol(const parser::Name &name) { 5305 return Resolve(name, currScope().MakeCommonBlock(name.source)); 5306 } 5307 Symbol &DeclarationVisitor::MakeCommonBlockSymbol( 5308 const std::optional<parser::Name> &name) { 5309 if (name) { 5310 return MakeCommonBlockSymbol(*name); 5311 } else { 5312 return MakeCommonBlockSymbol(parser::Name{}); 5313 } 5314 } 5315 5316 bool DeclarationVisitor::NameIsKnownOrIntrinsic(const parser::Name &name) { 5317 return FindSymbol(name) || HandleUnrestrictedSpecificIntrinsicFunction(name); 5318 } 5319 5320 // Check if this derived type can be in a COMMON block. 5321 void DeclarationVisitor::CheckCommonBlockDerivedType( 5322 const SourceName &name, const Symbol &typeSymbol) { 5323 if (const auto *scope{typeSymbol.scope()}) { 5324 for (const auto &pair : *scope) { 5325 const Symbol &component{*pair.second}; 5326 if (component.attrs().test(Attr::ALLOCATABLE)) { 5327 Say2(name, 5328 "Derived type variable '%s' may not appear in a COMMON block" 5329 " due to ALLOCATABLE component"_err_en_US, 5330 component.name(), "Component with ALLOCATABLE attribute"_en_US); 5331 return; 5332 } 5333 const auto *details{component.detailsIf<ObjectEntityDetails>()}; 5334 if (component.test(Symbol::Flag::InDataStmt) || 5335 (details && details->init())) { 5336 Say2(name, 5337 "Derived type variable '%s' may not appear in a COMMON block due to component with default initialization"_err_en_US, 5338 component.name(), "Component with default initialization"_en_US); 5339 return; 5340 } 5341 if (details) { 5342 if (const auto *type{details->type()}) { 5343 if (const auto *derived{type->AsDerived()}) { 5344 CheckCommonBlockDerivedType(name, derived->typeSymbol()); 5345 } 5346 } 5347 } 5348 } 5349 } 5350 } 5351 5352 bool DeclarationVisitor::HandleUnrestrictedSpecificIntrinsicFunction( 5353 const parser::Name &name) { 5354 if (auto interface{context().intrinsics().IsSpecificIntrinsicFunction( 5355 name.source.ToString())}) { 5356 // Unrestricted specific intrinsic function names (e.g., "cos") 5357 // are acceptable as procedure interfaces. The presence of the 5358 // INTRINSIC flag will cause this symbol to have a complete interface 5359 // recreated for it later on demand, but capturing its result type here 5360 // will make GetType() return a correct result without having to 5361 // probe the intrinsics table again. 5362 Symbol &symbol{ 5363 MakeSymbol(InclusiveScope(), name.source, Attrs{Attr::INTRINSIC})}; 5364 CHECK(interface->functionResult.has_value()); 5365 evaluate::DynamicType dyType{ 5366 DEREF(interface->functionResult->GetTypeAndShape()).type()}; 5367 CHECK(common::IsNumericTypeCategory(dyType.category())); 5368 const DeclTypeSpec &typeSpec{ 5369 MakeNumericType(dyType.category(), dyType.kind())}; 5370 ProcEntityDetails details; 5371 ProcInterface procInterface; 5372 procInterface.set_type(typeSpec); 5373 details.set_interface(procInterface); 5374 symbol.set_details(std::move(details)); 5375 symbol.set(Symbol::Flag::Function); 5376 if (interface->IsElemental()) { 5377 symbol.attrs().set(Attr::ELEMENTAL); 5378 } 5379 if (interface->IsPure()) { 5380 symbol.attrs().set(Attr::PURE); 5381 } 5382 Resolve(name, symbol); 5383 return true; 5384 } else { 5385 return false; 5386 } 5387 } 5388 5389 // Checks for all locality-specs: LOCAL, LOCAL_INIT, and SHARED 5390 bool DeclarationVisitor::PassesSharedLocalityChecks( 5391 const parser::Name &name, Symbol &symbol) { 5392 if (!IsVariableName(symbol)) { 5393 SayLocalMustBeVariable(name, symbol); // C1124 5394 return false; 5395 } 5396 if (symbol.owner() == currScope()) { // C1125 and C1126 5397 SayAlreadyDeclared(name, symbol); 5398 return false; 5399 } 5400 return true; 5401 } 5402 5403 // Checks for locality-specs LOCAL and LOCAL_INIT 5404 bool DeclarationVisitor::PassesLocalityChecks( 5405 const parser::Name &name, Symbol &symbol) { 5406 if (IsAllocatable(symbol)) { // C1128 5407 SayWithDecl(name, symbol, 5408 "ALLOCATABLE variable '%s' not allowed in a locality-spec"_err_en_US); 5409 return false; 5410 } 5411 if (IsOptional(symbol)) { // C1128 5412 SayWithDecl(name, symbol, 5413 "OPTIONAL argument '%s' not allowed in a locality-spec"_err_en_US); 5414 return false; 5415 } 5416 if (IsIntentIn(symbol)) { // C1128 5417 SayWithDecl(name, symbol, 5418 "INTENT IN argument '%s' not allowed in a locality-spec"_err_en_US); 5419 return false; 5420 } 5421 if (IsFinalizable(symbol)) { // C1128 5422 SayWithDecl(name, symbol, 5423 "Finalizable variable '%s' not allowed in a locality-spec"_err_en_US); 5424 return false; 5425 } 5426 if (evaluate::IsCoarray(symbol)) { // C1128 5427 SayWithDecl( 5428 name, symbol, "Coarray '%s' not allowed in a locality-spec"_err_en_US); 5429 return false; 5430 } 5431 if (const DeclTypeSpec * type{symbol.GetType()}) { 5432 if (type->IsPolymorphic() && IsDummy(symbol) && 5433 !IsPointer(symbol)) { // C1128 5434 SayWithDecl(name, symbol, 5435 "Nonpointer polymorphic argument '%s' not allowed in a " 5436 "locality-spec"_err_en_US); 5437 return false; 5438 } 5439 } 5440 if (IsAssumedSizeArray(symbol)) { // C1128 5441 SayWithDecl(name, symbol, 5442 "Assumed size array '%s' not allowed in a locality-spec"_err_en_US); 5443 return false; 5444 } 5445 if (std::optional<Message> msg{WhyNotModifiable(symbol, currScope())}) { 5446 SayWithReason(name, symbol, 5447 "'%s' may not appear in a locality-spec because it is not " 5448 "definable"_err_en_US, 5449 std::move(*msg)); 5450 return false; 5451 } 5452 return PassesSharedLocalityChecks(name, symbol); 5453 } 5454 5455 Symbol &DeclarationVisitor::FindOrDeclareEnclosingEntity( 5456 const parser::Name &name) { 5457 Symbol *prev{FindSymbol(name)}; 5458 if (!prev) { 5459 // Declare the name as an object in the enclosing scope so that 5460 // the name can't be repurposed there later as something else. 5461 prev = &MakeSymbol(InclusiveScope(), name.source, Attrs{}); 5462 ConvertToObjectEntity(*prev); 5463 ApplyImplicitRules(*prev); 5464 } 5465 return *prev; 5466 } 5467 5468 Symbol *DeclarationVisitor::DeclareLocalEntity(const parser::Name &name) { 5469 Symbol &prev{FindOrDeclareEnclosingEntity(name)}; 5470 if (!PassesLocalityChecks(name, prev)) { 5471 return nullptr; 5472 } 5473 return &MakeHostAssocSymbol(name, prev); 5474 } 5475 5476 Symbol *DeclarationVisitor::DeclareStatementEntity( 5477 const parser::DoVariable &doVar, 5478 const std::optional<parser::IntegerTypeSpec> &type) { 5479 const parser::Name &name{doVar.thing.thing}; 5480 const DeclTypeSpec *declTypeSpec{nullptr}; 5481 if (auto *prev{FindSymbol(name)}) { 5482 if (prev->owner() == currScope()) { 5483 SayAlreadyDeclared(name, *prev); 5484 return nullptr; 5485 } 5486 name.symbol = nullptr; 5487 declTypeSpec = prev->GetType(); 5488 } 5489 Symbol &symbol{DeclareEntity<ObjectEntityDetails>(name, {})}; 5490 if (!symbol.has<ObjectEntityDetails>()) { 5491 return nullptr; // error was reported in DeclareEntity 5492 } 5493 if (type) { 5494 declTypeSpec = ProcessTypeSpec(*type); 5495 } 5496 if (declTypeSpec) { 5497 // Subtlety: Don't let a "*length" specifier (if any is pending) affect the 5498 // declaration of this implied DO loop control variable. 5499 auto restorer{ 5500 common::ScopedSet(charInfo_.length, std::optional<ParamValue>{})}; 5501 SetType(name, *declTypeSpec); 5502 } else { 5503 ApplyImplicitRules(symbol); 5504 } 5505 Symbol *result{Resolve(name, &symbol)}; 5506 AnalyzeExpr(context(), doVar); // enforce INTEGER type 5507 return result; 5508 } 5509 5510 // Set the type of an entity or report an error. 5511 void DeclarationVisitor::SetType( 5512 const parser::Name &name, const DeclTypeSpec &type) { 5513 CHECK(name.symbol); 5514 auto &symbol{*name.symbol}; 5515 if (charInfo_.length) { // Declaration has "*length" (R723) 5516 auto length{std::move(*charInfo_.length)}; 5517 charInfo_.length.reset(); 5518 if (type.category() == DeclTypeSpec::Character) { 5519 auto kind{type.characterTypeSpec().kind()}; 5520 // Recurse with correct type. 5521 SetType(name, 5522 currScope().MakeCharacterType(std::move(length), std::move(kind))); 5523 return; 5524 } else { // C753 5525 Say(name, 5526 "A length specifier cannot be used to declare the non-character entity '%s'"_err_en_US); 5527 } 5528 } 5529 auto *prevType{symbol.GetType()}; 5530 if (!prevType) { 5531 symbol.SetType(type); 5532 } else if (symbol.has<UseDetails>()) { 5533 // error recovery case, redeclaration of use-associated name 5534 } else if (HadForwardRef(symbol)) { 5535 // error recovery after use of host-associated name 5536 } else if (!symbol.test(Symbol::Flag::Implicit)) { 5537 SayWithDecl( 5538 name, symbol, "The type of '%s' has already been declared"_err_en_US); 5539 context().SetError(symbol); 5540 } else if (type != *prevType) { 5541 SayWithDecl(name, symbol, 5542 "The type of '%s' has already been implicitly declared"_err_en_US); 5543 context().SetError(symbol); 5544 } else { 5545 symbol.set(Symbol::Flag::Implicit, false); 5546 } 5547 } 5548 5549 std::optional<DerivedTypeSpec> DeclarationVisitor::ResolveDerivedType( 5550 const parser::Name &name) { 5551 Symbol *symbol{FindSymbol(NonDerivedTypeScope(), name)}; 5552 if (!symbol || symbol->has<UnknownDetails>()) { 5553 if (allowForwardReferenceToDerivedType()) { 5554 if (!symbol) { 5555 symbol = &MakeSymbol(InclusiveScope(), name.source, Attrs{}); 5556 Resolve(name, *symbol); 5557 }; 5558 DerivedTypeDetails details; 5559 details.set_isForwardReferenced(true); 5560 symbol->set_details(std::move(details)); 5561 } else { // C732 5562 Say(name, "Derived type '%s' not found"_err_en_US); 5563 return std::nullopt; 5564 } 5565 } 5566 if (CheckUseError(name)) { 5567 return std::nullopt; 5568 } 5569 symbol = &symbol->GetUltimate(); 5570 if (auto *details{symbol->detailsIf<GenericDetails>()}) { 5571 if (details->derivedType()) { 5572 symbol = &details->derivedType()->GetUltimate(); 5573 } 5574 } 5575 if (symbol->has<DerivedTypeDetails>()) { 5576 return DerivedTypeSpec{name.source, *symbol}; 5577 } else { 5578 Say(name, "'%s' is not a derived type"_err_en_US); 5579 return std::nullopt; 5580 } 5581 } 5582 5583 std::optional<DerivedTypeSpec> DeclarationVisitor::ResolveExtendsType( 5584 const parser::Name &typeName, const parser::Name *extendsName) { 5585 if (!extendsName) { 5586 return std::nullopt; 5587 } else if (typeName.source == extendsName->source) { 5588 Say(extendsName->source, 5589 "Derived type '%s' cannot extend itself"_err_en_US); 5590 return std::nullopt; 5591 } else { 5592 return ResolveDerivedType(*extendsName); 5593 } 5594 } 5595 5596 Symbol *DeclarationVisitor::NoteInterfaceName(const parser::Name &name) { 5597 // The symbol is checked later by CheckExplicitInterface() and 5598 // CheckBindings(). It can be a forward reference. 5599 if (!NameIsKnownOrIntrinsic(name)) { 5600 Symbol &symbol{MakeSymbol(InclusiveScope(), name.source, Attrs{})}; 5601 Resolve(name, symbol); 5602 } 5603 return name.symbol; 5604 } 5605 5606 void DeclarationVisitor::CheckExplicitInterface(const parser::Name &name) { 5607 if (const Symbol * symbol{name.symbol}) { 5608 if (!context().HasError(*symbol) && !symbol->HasExplicitInterface()) { 5609 Say(name, 5610 "'%s' must be an abstract interface or a procedure with " 5611 "an explicit interface"_err_en_US, 5612 symbol->name()); 5613 } 5614 } 5615 } 5616 5617 // Create a symbol for a type parameter, component, or procedure binding in 5618 // the current derived type scope. Return false on error. 5619 Symbol *DeclarationVisitor::MakeTypeSymbol( 5620 const parser::Name &name, Details &&details) { 5621 return Resolve(name, MakeTypeSymbol(name.source, std::move(details))); 5622 } 5623 Symbol *DeclarationVisitor::MakeTypeSymbol( 5624 const SourceName &name, Details &&details) { 5625 Scope &derivedType{currScope()}; 5626 CHECK(derivedType.IsDerivedType()); 5627 if (auto *symbol{FindInScope(derivedType, name)}) { // C742 5628 Say2(name, 5629 "Type parameter, component, or procedure binding '%s'" 5630 " already defined in this type"_err_en_US, 5631 *symbol, "Previous definition of '%s'"_en_US); 5632 return nullptr; 5633 } else { 5634 auto attrs{GetAttrs()}; 5635 // Apply binding-private-stmt if present and this is a procedure binding 5636 if (derivedTypeInfo_.privateBindings && 5637 !attrs.HasAny({Attr::PUBLIC, Attr::PRIVATE}) && 5638 std::holds_alternative<ProcBindingDetails>(details)) { 5639 attrs.set(Attr::PRIVATE); 5640 } 5641 Symbol &result{MakeSymbol(name, attrs, std::move(details))}; 5642 if (result.has<TypeParamDetails>()) { 5643 derivedType.symbol()->get<DerivedTypeDetails>().add_paramDecl(result); 5644 } 5645 return &result; 5646 } 5647 } 5648 5649 // Return true if it is ok to declare this component in the current scope. 5650 // Otherwise, emit an error and return false. 5651 bool DeclarationVisitor::OkToAddComponent( 5652 const parser::Name &name, const Symbol *extends) { 5653 for (const Scope *scope{&currScope()}; scope;) { 5654 CHECK(scope->IsDerivedType()); 5655 if (auto *prev{FindInScope(*scope, name)}) { 5656 if (!context().HasError(*prev)) { 5657 parser::MessageFixedText msg; 5658 if (extends) { 5659 msg = "Type cannot be extended as it has a component named" 5660 " '%s'"_err_en_US; 5661 } else if (prev->test(Symbol::Flag::ParentComp)) { 5662 msg = "'%s' is a parent type of this type and so cannot be" 5663 " a component"_err_en_US; 5664 } else if (scope != &currScope()) { 5665 msg = "Component '%s' is already declared in a parent of this" 5666 " derived type"_err_en_US; 5667 } else { 5668 msg = "Component '%s' is already declared in this" 5669 " derived type"_err_en_US; 5670 } 5671 Say2(name, std::move(msg), *prev, "Previous declaration of '%s'"_en_US); 5672 } 5673 return false; 5674 } 5675 if (scope == &currScope() && extends) { 5676 // The parent component has not yet been added to the scope. 5677 scope = extends->scope(); 5678 } else { 5679 scope = scope->GetDerivedTypeParent(); 5680 } 5681 } 5682 return true; 5683 } 5684 5685 ParamValue DeclarationVisitor::GetParamValue( 5686 const parser::TypeParamValue &x, common::TypeParamAttr attr) { 5687 return common::visit( 5688 common::visitors{ 5689 [=](const parser::ScalarIntExpr &x) { // C704 5690 return ParamValue{EvaluateIntExpr(x), attr}; 5691 }, 5692 [=](const parser::Star &) { return ParamValue::Assumed(attr); }, 5693 [=](const parser::TypeParamValue::Deferred &) { 5694 return ParamValue::Deferred(attr); 5695 }, 5696 }, 5697 x.u); 5698 } 5699 5700 // ConstructVisitor implementation 5701 5702 void ConstructVisitor::ResolveIndexName( 5703 const parser::ConcurrentControl &control) { 5704 const parser::Name &name{std::get<parser::Name>(control.t)}; 5705 auto *prev{FindSymbol(name)}; 5706 if (prev) { 5707 if (prev->owner().kind() == Scope::Kind::Forall || 5708 prev->owner() == currScope()) { 5709 SayAlreadyDeclared(name, *prev); 5710 return; 5711 } 5712 name.symbol = nullptr; 5713 } 5714 auto &symbol{DeclareObjectEntity(name)}; 5715 if (symbol.GetType()) { 5716 // type came from explicit type-spec 5717 } else if (!prev) { 5718 ApplyImplicitRules(symbol); 5719 } else { 5720 const Symbol &prevRoot{ResolveAssociations(*prev)}; 5721 // prev could be host- use- or construct-associated with another symbol 5722 if (!prevRoot.has<ObjectEntityDetails>() && 5723 !prevRoot.has<EntityDetails>()) { 5724 Say2(name, "Index name '%s' conflicts with existing identifier"_err_en_US, 5725 *prev, "Previous declaration of '%s'"_en_US); 5726 context().SetError(symbol); 5727 return; 5728 } else { 5729 if (const auto *type{prevRoot.GetType()}) { 5730 symbol.SetType(*type); 5731 } 5732 if (prevRoot.IsObjectArray()) { 5733 SayWithDecl(name, *prev, "Index variable '%s' is not scalar"_err_en_US); 5734 return; 5735 } 5736 } 5737 } 5738 EvaluateExpr(parser::Scalar{parser::Integer{common::Clone(name)}}); 5739 } 5740 5741 // We need to make sure that all of the index-names get declared before the 5742 // expressions in the loop control are evaluated so that references to the 5743 // index-names in the expressions are correctly detected. 5744 bool ConstructVisitor::Pre(const parser::ConcurrentHeader &header) { 5745 BeginDeclTypeSpec(); 5746 Walk(std::get<std::optional<parser::IntegerTypeSpec>>(header.t)); 5747 const auto &controls{ 5748 std::get<std::list<parser::ConcurrentControl>>(header.t)}; 5749 for (const auto &control : controls) { 5750 ResolveIndexName(control); 5751 } 5752 Walk(controls); 5753 Walk(std::get<std::optional<parser::ScalarLogicalExpr>>(header.t)); 5754 EndDeclTypeSpec(); 5755 return false; 5756 } 5757 5758 bool ConstructVisitor::Pre(const parser::LocalitySpec::Local &x) { 5759 for (auto &name : x.v) { 5760 if (auto *symbol{DeclareLocalEntity(name)}) { 5761 symbol->set(Symbol::Flag::LocalityLocal); 5762 } 5763 } 5764 return false; 5765 } 5766 5767 bool ConstructVisitor::Pre(const parser::LocalitySpec::LocalInit &x) { 5768 for (auto &name : x.v) { 5769 if (auto *symbol{DeclareLocalEntity(name)}) { 5770 symbol->set(Symbol::Flag::LocalityLocalInit); 5771 } 5772 } 5773 return false; 5774 } 5775 5776 bool ConstructVisitor::Pre(const parser::LocalitySpec::Shared &x) { 5777 for (const auto &name : x.v) { 5778 if (!FindSymbol(name)) { 5779 Say(name, 5780 "Variable '%s' with SHARED locality implicitly declared"_warn_en_US); 5781 } 5782 Symbol &prev{FindOrDeclareEnclosingEntity(name)}; 5783 if (PassesSharedLocalityChecks(name, prev)) { 5784 MakeHostAssocSymbol(name, prev).set(Symbol::Flag::LocalityShared); 5785 } 5786 } 5787 return false; 5788 } 5789 5790 bool ConstructVisitor::Pre(const parser::AcSpec &x) { 5791 ProcessTypeSpec(x.type); 5792 Walk(x.values); 5793 return false; 5794 } 5795 5796 // Section 19.4, paragraph 5 says that each ac-do-variable has the scope of the 5797 // enclosing ac-implied-do 5798 bool ConstructVisitor::Pre(const parser::AcImpliedDo &x) { 5799 auto &values{std::get<std::list<parser::AcValue>>(x.t)}; 5800 auto &control{std::get<parser::AcImpliedDoControl>(x.t)}; 5801 auto &type{std::get<std::optional<parser::IntegerTypeSpec>>(control.t)}; 5802 auto &bounds{std::get<parser::AcImpliedDoControl::Bounds>(control.t)}; 5803 // F'2018 has the scope of the implied DO variable covering the entire 5804 // implied DO production (19.4(5)), which seems wrong in cases where the name 5805 // of the implied DO variable appears in one of the bound expressions. Thus 5806 // this extension, which shrinks the scope of the variable to exclude the 5807 // expressions in the bounds. 5808 auto restore{BeginCheckOnIndexUseInOwnBounds(bounds.name)}; 5809 Walk(bounds.lower); 5810 Walk(bounds.upper); 5811 Walk(bounds.step); 5812 EndCheckOnIndexUseInOwnBounds(restore); 5813 PushScope(Scope::Kind::ImpliedDos, nullptr); 5814 DeclareStatementEntity(bounds.name, type); 5815 Walk(values); 5816 PopScope(); 5817 return false; 5818 } 5819 5820 bool ConstructVisitor::Pre(const parser::DataImpliedDo &x) { 5821 auto &objects{std::get<std::list<parser::DataIDoObject>>(x.t)}; 5822 auto &type{std::get<std::optional<parser::IntegerTypeSpec>>(x.t)}; 5823 auto &bounds{std::get<parser::DataImpliedDo::Bounds>(x.t)}; 5824 // See comment in Pre(AcImpliedDo) above. 5825 auto restore{BeginCheckOnIndexUseInOwnBounds(bounds.name)}; 5826 Walk(bounds.lower); 5827 Walk(bounds.upper); 5828 Walk(bounds.step); 5829 EndCheckOnIndexUseInOwnBounds(restore); 5830 bool pushScope{currScope().kind() != Scope::Kind::ImpliedDos}; 5831 if (pushScope) { 5832 PushScope(Scope::Kind::ImpliedDos, nullptr); 5833 } 5834 DeclareStatementEntity(bounds.name, type); 5835 Walk(objects); 5836 if (pushScope) { 5837 PopScope(); 5838 } 5839 return false; 5840 } 5841 5842 // Sets InDataStmt flag on a variable (or misidentified function) in a DATA 5843 // statement so that the predicate IsInitialized() will be true 5844 // during semantic analysis before the symbol's initializer is constructed. 5845 bool ConstructVisitor::Pre(const parser::DataIDoObject &x) { 5846 common::visit( 5847 common::visitors{ 5848 [&](const parser::Scalar<Indirection<parser::Designator>> &y) { 5849 Walk(y.thing.value()); 5850 const parser::Name &first{parser::GetFirstName(y.thing.value())}; 5851 if (first.symbol) { 5852 first.symbol->set(Symbol::Flag::InDataStmt); 5853 } 5854 }, 5855 [&](const Indirection<parser::DataImpliedDo> &y) { Walk(y.value()); }, 5856 }, 5857 x.u); 5858 return false; 5859 } 5860 5861 bool ConstructVisitor::Pre(const parser::DataStmtObject &x) { 5862 common::visit(common::visitors{ 5863 [&](const Indirection<parser::Variable> &y) { 5864 Walk(y.value()); 5865 const parser::Name &first{ 5866 parser::GetFirstName(y.value())}; 5867 if (first.symbol) { 5868 first.symbol->set(Symbol::Flag::InDataStmt); 5869 } 5870 }, 5871 [&](const parser::DataImpliedDo &y) { 5872 PushScope(Scope::Kind::ImpliedDos, nullptr); 5873 Walk(y); 5874 PopScope(); 5875 }, 5876 }, 5877 x.u); 5878 return false; 5879 } 5880 5881 bool ConstructVisitor::Pre(const parser::DataStmtValue &x) { 5882 const auto &data{std::get<parser::DataStmtConstant>(x.t)}; 5883 auto &mutableData{const_cast<parser::DataStmtConstant &>(data)}; 5884 if (auto *elem{parser::Unwrap<parser::ArrayElement>(mutableData)}) { 5885 if (const auto *name{std::get_if<parser::Name>(&elem->base.u)}) { 5886 if (const Symbol * symbol{FindSymbol(*name)}) { 5887 const Symbol &ultimate{symbol->GetUltimate()}; 5888 if (ultimate.has<DerivedTypeDetails>()) { 5889 mutableData.u = elem->ConvertToStructureConstructor( 5890 DerivedTypeSpec{name->source, ultimate}); 5891 } 5892 } 5893 } 5894 } 5895 return true; 5896 } 5897 5898 bool ConstructVisitor::Pre(const parser::DoConstruct &x) { 5899 if (x.IsDoConcurrent()) { 5900 PushScope(Scope::Kind::Block, nullptr); 5901 } 5902 return true; 5903 } 5904 void ConstructVisitor::Post(const parser::DoConstruct &x) { 5905 if (x.IsDoConcurrent()) { 5906 PopScope(); 5907 } 5908 } 5909 5910 bool ConstructVisitor::Pre(const parser::ForallConstruct &) { 5911 PushScope(Scope::Kind::Forall, nullptr); 5912 return true; 5913 } 5914 void ConstructVisitor::Post(const parser::ForallConstruct &) { PopScope(); } 5915 bool ConstructVisitor::Pre(const parser::ForallStmt &) { 5916 PushScope(Scope::Kind::Forall, nullptr); 5917 return true; 5918 } 5919 void ConstructVisitor::Post(const parser::ForallStmt &) { PopScope(); } 5920 5921 bool ConstructVisitor::Pre(const parser::BlockStmt &x) { 5922 CheckDef(x.v); 5923 PushScope(Scope::Kind::Block, nullptr); 5924 return false; 5925 } 5926 bool ConstructVisitor::Pre(const parser::EndBlockStmt &x) { 5927 PopScope(); 5928 CheckRef(x.v); 5929 return false; 5930 } 5931 5932 void ConstructVisitor::Post(const parser::Selector &x) { 5933 GetCurrentAssociation().selector = ResolveSelector(x); 5934 } 5935 5936 void ConstructVisitor::Post(const parser::AssociateStmt &x) { 5937 CheckDef(x.t); 5938 PushScope(Scope::Kind::Block, nullptr); 5939 const auto assocCount{std::get<std::list<parser::Association>>(x.t).size()}; 5940 for (auto nthLastAssoc{assocCount}; nthLastAssoc > 0; --nthLastAssoc) { 5941 SetCurrentAssociation(nthLastAssoc); 5942 if (auto *symbol{MakeAssocEntity()}) { 5943 if (ExtractCoarrayRef(GetCurrentAssociation().selector.expr)) { // C1103 5944 Say("Selector must not be a coindexed object"_err_en_US); 5945 } 5946 SetTypeFromAssociation(*symbol); 5947 SetAttrsFromAssociation(*symbol); 5948 } 5949 } 5950 PopAssociation(assocCount); 5951 } 5952 5953 void ConstructVisitor::Post(const parser::EndAssociateStmt &x) { 5954 PopScope(); 5955 CheckRef(x.v); 5956 } 5957 5958 bool ConstructVisitor::Pre(const parser::Association &x) { 5959 PushAssociation(); 5960 const auto &name{std::get<parser::Name>(x.t)}; 5961 GetCurrentAssociation().name = &name; 5962 return true; 5963 } 5964 5965 bool ConstructVisitor::Pre(const parser::ChangeTeamStmt &x) { 5966 CheckDef(x.t); 5967 PushScope(Scope::Kind::Block, nullptr); 5968 PushAssociation(); 5969 return true; 5970 } 5971 5972 void ConstructVisitor::Post(const parser::CoarrayAssociation &x) { 5973 const auto &decl{std::get<parser::CodimensionDecl>(x.t)}; 5974 const auto &name{std::get<parser::Name>(decl.t)}; 5975 if (auto *symbol{FindInScope(name)}) { 5976 const auto &selector{std::get<parser::Selector>(x.t)}; 5977 if (auto sel{ResolveSelector(selector)}) { 5978 const Symbol *whole{UnwrapWholeSymbolDataRef(sel.expr)}; 5979 if (!whole || whole->Corank() == 0) { 5980 Say(sel.source, // C1116 5981 "Selector in coarray association must name a coarray"_err_en_US); 5982 } else if (auto dynType{sel.expr->GetType()}) { 5983 if (!symbol->GetType()) { 5984 symbol->SetType(ToDeclTypeSpec(std::move(*dynType))); 5985 } 5986 } 5987 } 5988 } 5989 } 5990 5991 void ConstructVisitor::Post(const parser::EndChangeTeamStmt &x) { 5992 PopAssociation(); 5993 PopScope(); 5994 CheckRef(x.t); 5995 } 5996 5997 bool ConstructVisitor::Pre(const parser::SelectTypeConstruct &) { 5998 PushAssociation(); 5999 return true; 6000 } 6001 6002 void ConstructVisitor::Post(const parser::SelectTypeConstruct &) { 6003 PopAssociation(); 6004 } 6005 6006 void ConstructVisitor::Post(const parser::SelectTypeStmt &x) { 6007 auto &association{GetCurrentAssociation()}; 6008 if (const std::optional<parser::Name> &name{std::get<1>(x.t)}) { 6009 // This isn't a name in the current scope, it is in each TypeGuardStmt 6010 MakePlaceholder(*name, MiscDetails::Kind::SelectTypeAssociateName); 6011 association.name = &*name; 6012 auto exprType{association.selector.expr->GetType()}; 6013 if (ExtractCoarrayRef(association.selector.expr)) { // C1103 6014 Say("Selector must not be a coindexed object"_err_en_US); 6015 } 6016 if (exprType && !exprType->IsPolymorphic()) { // C1159 6017 Say(association.selector.source, 6018 "Selector '%s' in SELECT TYPE statement must be " 6019 "polymorphic"_err_en_US); 6020 } 6021 } else { 6022 if (const Symbol * 6023 whole{UnwrapWholeSymbolDataRef(association.selector.expr)}) { 6024 ConvertToObjectEntity(const_cast<Symbol &>(*whole)); 6025 if (!IsVariableName(*whole)) { 6026 Say(association.selector.source, // C901 6027 "Selector is not a variable"_err_en_US); 6028 association = {}; 6029 } 6030 if (const DeclTypeSpec * type{whole->GetType()}) { 6031 if (!type->IsPolymorphic()) { // C1159 6032 Say(association.selector.source, 6033 "Selector '%s' in SELECT TYPE statement must be " 6034 "polymorphic"_err_en_US); 6035 } 6036 } 6037 } else { 6038 Say(association.selector.source, // C1157 6039 "Selector is not a named variable: 'associate-name =>' is required"_err_en_US); 6040 association = {}; 6041 } 6042 } 6043 } 6044 6045 void ConstructVisitor::Post(const parser::SelectRankStmt &x) { 6046 auto &association{GetCurrentAssociation()}; 6047 if (const std::optional<parser::Name> &name{std::get<1>(x.t)}) { 6048 // This isn't a name in the current scope, it is in each SelectRankCaseStmt 6049 MakePlaceholder(*name, MiscDetails::Kind::SelectRankAssociateName); 6050 association.name = &*name; 6051 } 6052 } 6053 6054 bool ConstructVisitor::Pre(const parser::SelectTypeConstruct::TypeCase &) { 6055 PushScope(Scope::Kind::Block, nullptr); 6056 return true; 6057 } 6058 void ConstructVisitor::Post(const parser::SelectTypeConstruct::TypeCase &) { 6059 PopScope(); 6060 } 6061 6062 bool ConstructVisitor::Pre(const parser::SelectRankConstruct::RankCase &) { 6063 PushScope(Scope::Kind::Block, nullptr); 6064 return true; 6065 } 6066 void ConstructVisitor::Post(const parser::SelectRankConstruct::RankCase &) { 6067 PopScope(); 6068 } 6069 6070 void ConstructVisitor::Post(const parser::TypeGuardStmt::Guard &x) { 6071 if (auto *symbol{MakeAssocEntity()}) { 6072 if (std::holds_alternative<parser::Default>(x.u)) { 6073 SetTypeFromAssociation(*symbol); 6074 } else if (const auto *type{GetDeclTypeSpec()}) { 6075 symbol->SetType(*type); 6076 } 6077 SetAttrsFromAssociation(*symbol); 6078 } 6079 } 6080 6081 void ConstructVisitor::Post(const parser::SelectRankCaseStmt::Rank &x) { 6082 if (auto *symbol{MakeAssocEntity()}) { 6083 SetTypeFromAssociation(*symbol); 6084 SetAttrsFromAssociation(*symbol); 6085 if (const auto *init{std::get_if<parser::ScalarIntConstantExpr>(&x.u)}) { 6086 if (auto val{EvaluateInt64(context(), *init)}) { 6087 auto &details{symbol->get<AssocEntityDetails>()}; 6088 details.set_rank(*val); 6089 } 6090 } 6091 } 6092 } 6093 6094 bool ConstructVisitor::Pre(const parser::SelectRankConstruct &) { 6095 PushAssociation(); 6096 return true; 6097 } 6098 6099 void ConstructVisitor::Post(const parser::SelectRankConstruct &) { 6100 PopAssociation(); 6101 } 6102 6103 bool ConstructVisitor::CheckDef(const std::optional<parser::Name> &x) { 6104 if (x) { 6105 MakeSymbol(*x, MiscDetails{MiscDetails::Kind::ConstructName}); 6106 } 6107 return true; 6108 } 6109 6110 void ConstructVisitor::CheckRef(const std::optional<parser::Name> &x) { 6111 if (x) { 6112 // Just add an occurrence of this name; checking is done in ValidateLabels 6113 FindSymbol(*x); 6114 } 6115 } 6116 6117 // Make a symbol for the associating entity of the current association. 6118 Symbol *ConstructVisitor::MakeAssocEntity() { 6119 Symbol *symbol{nullptr}; 6120 auto &association{GetCurrentAssociation()}; 6121 if (association.name) { 6122 symbol = &MakeSymbol(*association.name, UnknownDetails{}); 6123 if (symbol->has<AssocEntityDetails>() && symbol->owner() == currScope()) { 6124 Say(*association.name, // C1102 6125 "The associate name '%s' is already used in this associate statement"_err_en_US); 6126 return nullptr; 6127 } 6128 } else if (const Symbol * 6129 whole{UnwrapWholeSymbolDataRef(association.selector.expr)}) { 6130 symbol = &MakeSymbol(whole->name()); 6131 } else { 6132 return nullptr; 6133 } 6134 if (auto &expr{association.selector.expr}) { 6135 symbol->set_details(AssocEntityDetails{common::Clone(*expr)}); 6136 } else { 6137 symbol->set_details(AssocEntityDetails{}); 6138 } 6139 return symbol; 6140 } 6141 6142 // Set the type of symbol based on the current association selector. 6143 void ConstructVisitor::SetTypeFromAssociation(Symbol &symbol) { 6144 auto &details{symbol.get<AssocEntityDetails>()}; 6145 const MaybeExpr *pexpr{&details.expr()}; 6146 if (!*pexpr) { 6147 pexpr = &GetCurrentAssociation().selector.expr; 6148 } 6149 if (*pexpr) { 6150 const SomeExpr &expr{**pexpr}; 6151 if (std::optional<evaluate::DynamicType> type{expr.GetType()}) { 6152 if (const auto *charExpr{ 6153 evaluate::UnwrapExpr<evaluate::Expr<evaluate::SomeCharacter>>( 6154 expr)}) { 6155 symbol.SetType(ToDeclTypeSpec(std::move(*type), 6156 FoldExpr(common::visit( 6157 [](const auto &kindChar) { return kindChar.LEN(); }, 6158 charExpr->u)))); 6159 } else { 6160 symbol.SetType(ToDeclTypeSpec(std::move(*type))); 6161 } 6162 } else { 6163 // BOZ literals, procedure designators, &c. are not acceptable 6164 Say(symbol.name(), "Associate name '%s' must have a type"_err_en_US); 6165 } 6166 } 6167 } 6168 6169 // If current selector is a variable, set some of its attributes on symbol. 6170 void ConstructVisitor::SetAttrsFromAssociation(Symbol &symbol) { 6171 Attrs attrs{evaluate::GetAttrs(GetCurrentAssociation().selector.expr)}; 6172 symbol.attrs() |= attrs & 6173 Attrs{Attr::TARGET, Attr::ASYNCHRONOUS, Attr::VOLATILE, Attr::CONTIGUOUS}; 6174 if (attrs.test(Attr::POINTER)) { 6175 symbol.attrs().set(Attr::TARGET); 6176 } 6177 } 6178 6179 ConstructVisitor::Selector ConstructVisitor::ResolveSelector( 6180 const parser::Selector &x) { 6181 return common::visit(common::visitors{ 6182 [&](const parser::Expr &expr) { 6183 return Selector{expr.source, EvaluateExpr(x)}; 6184 }, 6185 [&](const parser::Variable &var) { 6186 return Selector{var.GetSource(), EvaluateExpr(x)}; 6187 }, 6188 }, 6189 x.u); 6190 } 6191 6192 // Set the current association to the nth to the last association on the 6193 // association stack. The top of the stack is at n = 1. This allows access 6194 // to the interior of a list of associations at the top of the stack. 6195 void ConstructVisitor::SetCurrentAssociation(std::size_t n) { 6196 CHECK(n > 0 && n <= associationStack_.size()); 6197 currentAssociation_ = &associationStack_[associationStack_.size() - n]; 6198 } 6199 6200 ConstructVisitor::Association &ConstructVisitor::GetCurrentAssociation() { 6201 CHECK(currentAssociation_); 6202 return *currentAssociation_; 6203 } 6204 6205 void ConstructVisitor::PushAssociation() { 6206 associationStack_.emplace_back(Association{}); 6207 currentAssociation_ = &associationStack_.back(); 6208 } 6209 6210 void ConstructVisitor::PopAssociation(std::size_t count) { 6211 CHECK(count > 0 && count <= associationStack_.size()); 6212 associationStack_.resize(associationStack_.size() - count); 6213 currentAssociation_ = 6214 associationStack_.empty() ? nullptr : &associationStack_.back(); 6215 } 6216 6217 const DeclTypeSpec &ConstructVisitor::ToDeclTypeSpec( 6218 evaluate::DynamicType &&type) { 6219 switch (type.category()) { 6220 SWITCH_COVERS_ALL_CASES 6221 case common::TypeCategory::Integer: 6222 case common::TypeCategory::Real: 6223 case common::TypeCategory::Complex: 6224 return context().MakeNumericType(type.category(), type.kind()); 6225 case common::TypeCategory::Logical: 6226 return context().MakeLogicalType(type.kind()); 6227 case common::TypeCategory::Derived: 6228 if (type.IsAssumedType()) { 6229 return currScope().MakeTypeStarType(); 6230 } else if (type.IsUnlimitedPolymorphic()) { 6231 return currScope().MakeClassStarType(); 6232 } else { 6233 return currScope().MakeDerivedType( 6234 type.IsPolymorphic() ? DeclTypeSpec::ClassDerived 6235 : DeclTypeSpec::TypeDerived, 6236 common::Clone(type.GetDerivedTypeSpec()) 6237 6238 ); 6239 } 6240 case common::TypeCategory::Character: 6241 CRASH_NO_CASE; 6242 } 6243 } 6244 6245 const DeclTypeSpec &ConstructVisitor::ToDeclTypeSpec( 6246 evaluate::DynamicType &&type, MaybeSubscriptIntExpr &&length) { 6247 CHECK(type.category() == common::TypeCategory::Character); 6248 if (length) { 6249 return currScope().MakeCharacterType( 6250 ParamValue{SomeIntExpr{*std::move(length)}, common::TypeParamAttr::Len}, 6251 KindExpr{type.kind()}); 6252 } else { 6253 return currScope().MakeCharacterType( 6254 ParamValue::Deferred(common::TypeParamAttr::Len), 6255 KindExpr{type.kind()}); 6256 } 6257 } 6258 6259 // ResolveNamesVisitor implementation 6260 6261 bool ResolveNamesVisitor::Pre(const parser::FunctionReference &x) { 6262 HandleCall(Symbol::Flag::Function, x.v); 6263 return false; 6264 } 6265 bool ResolveNamesVisitor::Pre(const parser::CallStmt &x) { 6266 HandleCall(Symbol::Flag::Subroutine, x.v); 6267 return false; 6268 } 6269 6270 bool ResolveNamesVisitor::Pre(const parser::ImportStmt &x) { 6271 auto &scope{currScope()}; 6272 // Check C896 and C899: where IMPORT statements are allowed 6273 switch (scope.kind()) { 6274 case Scope::Kind::Module: 6275 if (scope.IsModule()) { 6276 Say("IMPORT is not allowed in a module scoping unit"_err_en_US); 6277 return false; 6278 } else if (x.kind == common::ImportKind::None) { 6279 Say("IMPORT,NONE is not allowed in a submodule scoping unit"_err_en_US); 6280 return false; 6281 } 6282 break; 6283 case Scope::Kind::MainProgram: 6284 Say("IMPORT is not allowed in a main program scoping unit"_err_en_US); 6285 return false; 6286 case Scope::Kind::Subprogram: 6287 if (scope.parent().IsGlobal()) { 6288 Say("IMPORT is not allowed in an external subprogram scoping unit"_err_en_US); 6289 return false; 6290 } 6291 break; 6292 case Scope::Kind::BlockData: // C1415 (in part) 6293 Say("IMPORT is not allowed in a BLOCK DATA subprogram"_err_en_US); 6294 return false; 6295 default:; 6296 } 6297 if (auto error{scope.SetImportKind(x.kind)}) { 6298 Say(std::move(*error)); 6299 } 6300 for (auto &name : x.names) { 6301 if (FindSymbol(scope.parent(), name)) { 6302 scope.add_importName(name.source); 6303 } else { 6304 Say(name, "'%s' not found in host scope"_err_en_US); 6305 } 6306 } 6307 prevImportStmt_ = currStmtSource(); 6308 return false; 6309 } 6310 6311 const parser::Name *DeclarationVisitor::ResolveStructureComponent( 6312 const parser::StructureComponent &x) { 6313 return FindComponent(ResolveDataRef(x.base), x.component); 6314 } 6315 6316 const parser::Name *DeclarationVisitor::ResolveDesignator( 6317 const parser::Designator &x) { 6318 return common::visit( 6319 common::visitors{ 6320 [&](const parser::DataRef &x) { return ResolveDataRef(x); }, 6321 [&](const parser::Substring &x) { 6322 return ResolveDataRef(std::get<parser::DataRef>(x.t)); 6323 }, 6324 }, 6325 x.u); 6326 } 6327 6328 const parser::Name *DeclarationVisitor::ResolveDataRef( 6329 const parser::DataRef &x) { 6330 return common::visit( 6331 common::visitors{ 6332 [=](const parser::Name &y) { return ResolveName(y); }, 6333 [=](const Indirection<parser::StructureComponent> &y) { 6334 return ResolveStructureComponent(y.value()); 6335 }, 6336 [&](const Indirection<parser::ArrayElement> &y) { 6337 Walk(y.value().subscripts); 6338 const parser::Name *name{ResolveDataRef(y.value().base)}; 6339 if (name && name->symbol) { 6340 if (!IsProcedure(*name->symbol)) { 6341 ConvertToObjectEntity(*name->symbol); 6342 } else if (!context().HasError(*name->symbol)) { 6343 SayWithDecl(*name, *name->symbol, 6344 "Cannot reference function '%s' as data"_err_en_US); 6345 } 6346 } 6347 return name; 6348 }, 6349 [&](const Indirection<parser::CoindexedNamedObject> &y) { 6350 Walk(y.value().imageSelector); 6351 return ResolveDataRef(y.value().base); 6352 }, 6353 }, 6354 x.u); 6355 } 6356 6357 // If implicit types are allowed, ensure name is in the symbol table. 6358 // Otherwise, report an error if it hasn't been declared. 6359 const parser::Name *DeclarationVisitor::ResolveName(const parser::Name &name) { 6360 FindSymbol(name); 6361 if (CheckForHostAssociatedImplicit(name)) { 6362 NotePossibleBadForwardRef(name); 6363 return &name; 6364 } 6365 if (Symbol * symbol{name.symbol}) { 6366 if (CheckUseError(name)) { 6367 return nullptr; // reported an error 6368 } 6369 NotePossibleBadForwardRef(name); 6370 symbol->set(Symbol::Flag::ImplicitOrError, false); 6371 if (IsUplevelReference(*symbol)) { 6372 MakeHostAssocSymbol(name, *symbol); 6373 } else if (IsDummy(*symbol) || 6374 (!symbol->GetType() && FindCommonBlockContaining(*symbol))) { 6375 ConvertToObjectEntity(*symbol); 6376 ApplyImplicitRules(*symbol); 6377 } 6378 if (checkIndexUseInOwnBounds_ && 6379 *checkIndexUseInOwnBounds_ == name.source) { 6380 Say(name, 6381 "Implied DO index '%s' uses an object of the same name in its bounds expressions"_port_en_US, 6382 name.source); 6383 } 6384 return &name; 6385 } 6386 if (isImplicitNoneType()) { 6387 Say(name, "No explicit type declared for '%s'"_err_en_US); 6388 return nullptr; 6389 } 6390 // Create the symbol then ensure it is accessible 6391 if (checkIndexUseInOwnBounds_ && *checkIndexUseInOwnBounds_ == name.source) { 6392 Say(name, 6393 "Implied DO index '%s' uses itself in its own bounds expressions"_err_en_US, 6394 name.source); 6395 } 6396 MakeSymbol(InclusiveScope(), name.source, Attrs{}); 6397 auto *symbol{FindSymbol(name)}; 6398 if (!symbol) { 6399 Say(name, 6400 "'%s' from host scoping unit is not accessible due to IMPORT"_err_en_US); 6401 return nullptr; 6402 } 6403 ConvertToObjectEntity(*symbol); 6404 ApplyImplicitRules(*symbol); 6405 NotePossibleBadForwardRef(name); 6406 return &name; 6407 } 6408 6409 // A specification expression may refer to a symbol in the host procedure that 6410 // is implicitly typed. Because specification parts are processed before 6411 // execution parts, this may be the first time we see the symbol. It can't be a 6412 // local in the current scope (because it's in a specification expression) so 6413 // either it is implicitly declared in the host procedure or it is an error. 6414 // We create a symbol in the host assuming it is the former; if that proves to 6415 // be wrong we report an error later in CheckDeclarations(). 6416 bool DeclarationVisitor::CheckForHostAssociatedImplicit( 6417 const parser::Name &name) { 6418 if (inExecutionPart_) { 6419 return false; 6420 } 6421 if (name.symbol) { 6422 ApplyImplicitRules(*name.symbol, true); 6423 } 6424 Symbol *hostSymbol; 6425 Scope *host{GetHostProcedure()}; 6426 if (!host || isImplicitNoneType(*host)) { 6427 return false; 6428 } 6429 if (!name.symbol) { 6430 hostSymbol = &MakeSymbol(*host, name.source, Attrs{}); 6431 ConvertToObjectEntity(*hostSymbol); 6432 ApplyImplicitRules(*hostSymbol); 6433 hostSymbol->set(Symbol::Flag::ImplicitOrError); 6434 } else if (name.symbol->test(Symbol::Flag::ImplicitOrError)) { 6435 hostSymbol = name.symbol; 6436 } else { 6437 return false; 6438 } 6439 Symbol &symbol{MakeHostAssocSymbol(name, *hostSymbol)}; 6440 if (isImplicitNoneType()) { 6441 symbol.get<HostAssocDetails>().implicitOrExplicitTypeError = true; 6442 } else { 6443 symbol.get<HostAssocDetails>().implicitOrSpecExprError = true; 6444 } 6445 return true; 6446 } 6447 6448 bool DeclarationVisitor::IsUplevelReference(const Symbol &symbol) { 6449 const Scope &symbolUnit{GetProgramUnitContaining(symbol)}; 6450 if (symbolUnit == GetProgramUnitContaining(currScope())) { 6451 return false; 6452 } else { 6453 Scope::Kind kind{symbolUnit.kind()}; 6454 return kind == Scope::Kind::Subprogram || kind == Scope::Kind::MainProgram; 6455 } 6456 } 6457 6458 // base is a part-ref of a derived type; find the named component in its type. 6459 // Also handles intrinsic type parameter inquiries (%kind, %len) and 6460 // COMPLEX component references (%re, %im). 6461 const parser::Name *DeclarationVisitor::FindComponent( 6462 const parser::Name *base, const parser::Name &component) { 6463 if (!base || !base->symbol) { 6464 return nullptr; 6465 } 6466 if (auto *misc{base->symbol->detailsIf<MiscDetails>()}) { 6467 if (component.source == "kind") { 6468 if (misc->kind() == MiscDetails::Kind::ComplexPartRe || 6469 misc->kind() == MiscDetails::Kind::ComplexPartIm || 6470 misc->kind() == MiscDetails::Kind::KindParamInquiry || 6471 misc->kind() == MiscDetails::Kind::LenParamInquiry) { 6472 // x%{re,im,kind,len}%kind 6473 MakePlaceholder(component, MiscDetails::Kind::KindParamInquiry); 6474 return &component; 6475 } 6476 } 6477 } 6478 auto &symbol{base->symbol->GetUltimate()}; 6479 if (!symbol.has<AssocEntityDetails>() && !ConvertToObjectEntity(symbol)) { 6480 SayWithDecl(*base, symbol, 6481 "'%s' is an invalid base for a component reference"_err_en_US); 6482 return nullptr; 6483 } 6484 auto *type{symbol.GetType()}; 6485 if (!type) { 6486 return nullptr; // should have already reported error 6487 } 6488 if (const IntrinsicTypeSpec * intrinsic{type->AsIntrinsic()}) { 6489 auto category{intrinsic->category()}; 6490 MiscDetails::Kind miscKind{MiscDetails::Kind::None}; 6491 if (component.source == "kind") { 6492 miscKind = MiscDetails::Kind::KindParamInquiry; 6493 } else if (category == TypeCategory::Character) { 6494 if (component.source == "len") { 6495 miscKind = MiscDetails::Kind::LenParamInquiry; 6496 } 6497 } else if (category == TypeCategory::Complex) { 6498 if (component.source == "re") { 6499 miscKind = MiscDetails::Kind::ComplexPartRe; 6500 } else if (component.source == "im") { 6501 miscKind = MiscDetails::Kind::ComplexPartIm; 6502 } 6503 } 6504 if (miscKind != MiscDetails::Kind::None) { 6505 MakePlaceholder(component, miscKind); 6506 return &component; 6507 } 6508 } else if (const DerivedTypeSpec * derived{type->AsDerived()}) { 6509 if (const Scope * scope{derived->scope()}) { 6510 if (Resolve(component, scope->FindComponent(component.source))) { 6511 if (auto msg{ 6512 CheckAccessibleComponent(currScope(), *component.symbol)}) { 6513 context().Say(component.source, *msg); 6514 } 6515 return &component; 6516 } else { 6517 SayDerivedType(component.source, 6518 "Component '%s' not found in derived type '%s'"_err_en_US, *scope); 6519 } 6520 } 6521 return nullptr; 6522 } 6523 if (symbol.test(Symbol::Flag::Implicit)) { 6524 Say(*base, 6525 "'%s' is not an object of derived type; it is implicitly typed"_err_en_US); 6526 } else { 6527 SayWithDecl( 6528 *base, symbol, "'%s' is not an object of derived type"_err_en_US); 6529 } 6530 return nullptr; 6531 } 6532 6533 void DeclarationVisitor::Initialization(const parser::Name &name, 6534 const parser::Initialization &init, bool inComponentDecl) { 6535 // Traversal of the initializer was deferred to here so that the 6536 // symbol being declared can be available for use in the expression, e.g.: 6537 // real, parameter :: x = tiny(x) 6538 if (!name.symbol) { 6539 return; 6540 } 6541 Symbol &ultimate{name.symbol->GetUltimate()}; 6542 if (IsAllocatable(ultimate)) { 6543 Say(name, "Allocatable object '%s' cannot be initialized"_err_en_US); 6544 return; 6545 } 6546 if (auto *object{ultimate.detailsIf<ObjectEntityDetails>()}) { 6547 // TODO: check C762 - all bounds and type parameters of component 6548 // are colons or constant expressions if component is initialized 6549 common::visit( 6550 common::visitors{ 6551 [&](const parser::ConstantExpr &expr) { 6552 NonPointerInitialization(name, expr); 6553 }, 6554 [&](const parser::NullInit &null) { 6555 Walk(null); 6556 if (auto nullInit{EvaluateExpr(null)}) { 6557 if (!evaluate::IsNullPointer(*nullInit)) { 6558 Say(name, 6559 "Pointer initializer must be intrinsic NULL()"_err_en_US); // C813 6560 } else if (IsPointer(ultimate)) { 6561 object->set_init(std::move(*nullInit)); 6562 } else { 6563 Say(name, 6564 "Non-pointer component '%s' initialized with null pointer"_err_en_US); 6565 } 6566 } 6567 }, 6568 [&](const parser::InitialDataTarget &) { 6569 // Defer analysis to the end of the specification part 6570 // so that forward references and attribute checks like SAVE 6571 // work better. 6572 ultimate.set(Symbol::Flag::InDataStmt); 6573 }, 6574 [&](const std::list<Indirection<parser::DataStmtValue>> &values) { 6575 // Handled later in data-to-inits conversion 6576 ultimate.set(Symbol::Flag::InDataStmt); 6577 Walk(values); 6578 }, 6579 }, 6580 init.u); 6581 } 6582 } 6583 6584 void DeclarationVisitor::PointerInitialization( 6585 const parser::Name &name, const parser::InitialDataTarget &target) { 6586 if (name.symbol) { 6587 Symbol &ultimate{name.symbol->GetUltimate()}; 6588 if (!context().HasError(ultimate)) { 6589 if (IsPointer(ultimate)) { 6590 if (auto *details{ultimate.detailsIf<ObjectEntityDetails>()}) { 6591 CHECK(!details->init()); 6592 Walk(target); 6593 if (MaybeExpr expr{EvaluateExpr(target)}) { 6594 // Validation is done in declaration checking. 6595 details->set_init(std::move(*expr)); 6596 } 6597 } 6598 } else { 6599 Say(name, 6600 "'%s' is not a pointer but is initialized like one"_err_en_US); 6601 context().SetError(ultimate); 6602 } 6603 } 6604 } 6605 } 6606 void DeclarationVisitor::PointerInitialization( 6607 const parser::Name &name, const parser::ProcPointerInit &target) { 6608 if (name.symbol) { 6609 Symbol &ultimate{name.symbol->GetUltimate()}; 6610 if (!context().HasError(ultimate)) { 6611 if (IsProcedurePointer(ultimate)) { 6612 auto &details{ultimate.get<ProcEntityDetails>()}; 6613 CHECK(!details.init()); 6614 Walk(target); 6615 if (const auto *targetName{std::get_if<parser::Name>(&target.u)}) { 6616 if (targetName->symbol) { 6617 // Validation is done in declaration checking. 6618 details.set_init(*targetName->symbol); 6619 } 6620 } else { 6621 details.set_init(nullptr); // explicit NULL() 6622 } 6623 } else { 6624 Say(name, 6625 "'%s' is not a procedure pointer but is initialized " 6626 "like one"_err_en_US); 6627 context().SetError(ultimate); 6628 } 6629 } 6630 } 6631 } 6632 6633 void DeclarationVisitor::NonPointerInitialization( 6634 const parser::Name &name, const parser::ConstantExpr &expr) { 6635 if (name.symbol) { 6636 Symbol &ultimate{name.symbol->GetUltimate()}; 6637 if (!context().HasError(ultimate) && !context().HasError(name.symbol)) { 6638 if (IsPointer(ultimate)) { 6639 Say(name, 6640 "'%s' is a pointer but is not initialized like one"_err_en_US); 6641 } else if (auto *details{ultimate.detailsIf<ObjectEntityDetails>()}) { 6642 CHECK(!details->init()); 6643 Walk(expr); 6644 if (ultimate.owner().IsParameterizedDerivedType()) { 6645 // Save the expression for per-instantiation analysis. 6646 details->set_unanalyzedPDTComponentInit(&expr.thing.value()); 6647 } else { 6648 if (MaybeExpr folded{EvaluateNonPointerInitializer( 6649 ultimate, expr, expr.thing.value().source)}) { 6650 details->set_init(std::move(*folded)); 6651 } 6652 } 6653 } 6654 } 6655 } 6656 } 6657 6658 void ResolveNamesVisitor::HandleCall( 6659 Symbol::Flag procFlag, const parser::Call &call) { 6660 common::visit( 6661 common::visitors{ 6662 [&](const parser::Name &x) { HandleProcedureName(procFlag, x); }, 6663 [&](const parser::ProcComponentRef &x) { Walk(x); }, 6664 }, 6665 std::get<parser::ProcedureDesignator>(call.t).u); 6666 Walk(std::get<std::list<parser::ActualArgSpec>>(call.t)); 6667 } 6668 6669 void ResolveNamesVisitor::HandleProcedureName( 6670 Symbol::Flag flag, const parser::Name &name) { 6671 CHECK(flag == Symbol::Flag::Function || flag == Symbol::Flag::Subroutine); 6672 auto *symbol{FindSymbol(NonDerivedTypeScope(), name)}; 6673 if (!symbol) { 6674 if (IsIntrinsic(name.source, flag)) { 6675 symbol = 6676 &MakeSymbol(InclusiveScope(), name.source, Attrs{Attr::INTRINSIC}); 6677 } else { 6678 symbol = &MakeSymbol(context().globalScope(), name.source, Attrs{}); 6679 } 6680 Resolve(name, *symbol); 6681 if (!symbol->attrs().test(Attr::INTRINSIC)) { 6682 if (CheckImplicitNoneExternal(name.source, *symbol)) { 6683 MakeExternal(*symbol); 6684 } 6685 } 6686 ConvertToProcEntity(*symbol); 6687 SetProcFlag(name, *symbol, flag); 6688 } else if (CheckUseError(name)) { 6689 // error was reported 6690 } else { 6691 auto &nonUltimateSymbol = *symbol; 6692 symbol = &Resolve(name, symbol)->GetUltimate(); 6693 bool convertedToProcEntity{ConvertToProcEntity(*symbol)}; 6694 if (convertedToProcEntity && !symbol->attrs().test(Attr::EXTERNAL) && 6695 IsIntrinsic(symbol->name(), flag) && !IsDummy(*symbol)) { 6696 AcquireIntrinsicProcedureFlags(*symbol); 6697 } 6698 if (!SetProcFlag(name, *symbol, flag)) { 6699 return; // reported error 6700 } 6701 if (!symbol->has<GenericDetails>()) { 6702 CheckImplicitNoneExternal(name.source, *symbol); 6703 } 6704 if (symbol->has<SubprogramDetails>() && 6705 symbol->attrs().test(Attr::ABSTRACT)) { 6706 Say(name, "Abstract interface '%s' may not be called"_err_en_US); 6707 } else if (IsProcedure(*symbol) || symbol->has<DerivedTypeDetails>() || 6708 symbol->has<AssocEntityDetails>()) { 6709 // Symbols with DerivedTypeDetails and AssocEntityDetails are accepted 6710 // here as procedure-designators because this means the related 6711 // FunctionReference are mis-parsed structure constructors or array 6712 // references that will be fixed later when analyzing expressions. 6713 } else if (symbol->has<ObjectEntityDetails>()) { 6714 // Symbols with ObjectEntityDetails are also accepted because this can be 6715 // a mis-parsed array references that will be fixed later. Ensure that if 6716 // this is a symbol from a host procedure, a symbol with HostAssocDetails 6717 // is created for the current scope. 6718 // Operate on non ultimate symbol so that HostAssocDetails are also 6719 // created for symbols used associated in the host procedure. 6720 if (IsUplevelReference(nonUltimateSymbol)) { 6721 MakeHostAssocSymbol(name, nonUltimateSymbol); 6722 } 6723 } else if (symbol->test(Symbol::Flag::Implicit)) { 6724 Say(name, 6725 "Use of '%s' as a procedure conflicts with its implicit definition"_err_en_US); 6726 } else { 6727 SayWithDecl(name, *symbol, 6728 "Use of '%s' as a procedure conflicts with its declaration"_err_en_US); 6729 } 6730 } 6731 } 6732 6733 bool ResolveNamesVisitor::CheckImplicitNoneExternal( 6734 const SourceName &name, const Symbol &symbol) { 6735 if (isImplicitNoneExternal() && !symbol.attrs().test(Attr::EXTERNAL) && 6736 !symbol.attrs().test(Attr::INTRINSIC) && !symbol.HasExplicitInterface()) { 6737 Say(name, 6738 "'%s' is an external procedure without the EXTERNAL" 6739 " attribute in a scope with IMPLICIT NONE(EXTERNAL)"_err_en_US); 6740 return false; 6741 } 6742 return true; 6743 } 6744 6745 // Variant of HandleProcedureName() for use while skimming the executable 6746 // part of a subprogram to catch calls to dummy procedures that are part 6747 // of the subprogram's interface, and to mark as procedures any symbols 6748 // that might otherwise have been miscategorized as objects. 6749 void ResolveNamesVisitor::NoteExecutablePartCall( 6750 Symbol::Flag flag, const parser::Call &call) { 6751 auto &designator{std::get<parser::ProcedureDesignator>(call.t)}; 6752 if (const auto *name{std::get_if<parser::Name>(&designator.u)}) { 6753 // Subtlety: The symbol pointers in the parse tree are not set, because 6754 // they might end up resolving elsewhere (e.g., construct entities in 6755 // SELECT TYPE). 6756 if (Symbol * symbol{currScope().FindSymbol(name->source)}) { 6757 Symbol::Flag other{flag == Symbol::Flag::Subroutine 6758 ? Symbol::Flag::Function 6759 : Symbol::Flag::Subroutine}; 6760 if (!symbol->test(other)) { 6761 ConvertToProcEntity(*symbol); 6762 if (symbol->has<ProcEntityDetails>()) { 6763 symbol->set(flag); 6764 if (IsDummy(*symbol)) { 6765 symbol->attrs().set(Attr::EXTERNAL); 6766 } 6767 ApplyImplicitRules(*symbol); 6768 } 6769 } 6770 } 6771 } 6772 } 6773 6774 static bool IsLocallyImplicitGlobalSymbol( 6775 const Symbol &symbol, const parser::Name &localName) { 6776 return symbol.owner().IsGlobal() && 6777 (!symbol.scope() || 6778 !symbol.scope()->sourceRange().Contains(localName.source)); 6779 } 6780 6781 static bool TypesMismatchIfNonNull( 6782 const DeclTypeSpec *type1, const DeclTypeSpec *type2) { 6783 return type1 && type2 && *type1 != *type2; 6784 } 6785 6786 // Check and set the Function or Subroutine flag on symbol; false on error. 6787 bool ResolveNamesVisitor::SetProcFlag( 6788 const parser::Name &name, Symbol &symbol, Symbol::Flag flag) { 6789 if (symbol.test(Symbol::Flag::Function) && flag == Symbol::Flag::Subroutine) { 6790 SayWithDecl( 6791 name, symbol, "Cannot call function '%s' like a subroutine"_err_en_US); 6792 return false; 6793 } else if (symbol.test(Symbol::Flag::Subroutine) && 6794 flag == Symbol::Flag::Function) { 6795 SayWithDecl( 6796 name, symbol, "Cannot call subroutine '%s' like a function"_err_en_US); 6797 return false; 6798 } else if (flag == Symbol::Flag::Function && 6799 IsLocallyImplicitGlobalSymbol(symbol, name) && 6800 TypesMismatchIfNonNull(symbol.GetType(), GetImplicitType(symbol))) { 6801 SayWithDecl(name, symbol, 6802 "Implicit declaration of function '%s' has a different result type than in previous declaration"_err_en_US); 6803 return false; 6804 } else if (symbol.has<ProcEntityDetails>()) { 6805 symbol.set(flag); // in case it hasn't been set yet 6806 if (flag == Symbol::Flag::Function) { 6807 ApplyImplicitRules(symbol); 6808 } 6809 if (symbol.attrs().test(Attr::INTRINSIC)) { 6810 AcquireIntrinsicProcedureFlags(symbol); 6811 } 6812 } else if (symbol.GetType() && flag == Symbol::Flag::Subroutine) { 6813 SayWithDecl( 6814 name, symbol, "Cannot call function '%s' like a subroutine"_err_en_US); 6815 } else if (symbol.attrs().test(Attr::INTRINSIC)) { 6816 AcquireIntrinsicProcedureFlags(symbol); 6817 } 6818 return true; 6819 } 6820 6821 bool ModuleVisitor::Pre(const parser::AccessStmt &x) { 6822 Attr accessAttr{AccessSpecToAttr(std::get<parser::AccessSpec>(x.t))}; 6823 if (!currScope().IsModule()) { // C869 6824 Say(currStmtSource().value(), 6825 "%s statement may only appear in the specification part of a module"_err_en_US, 6826 EnumToString(accessAttr)); 6827 return false; 6828 } 6829 const auto &accessIds{std::get<std::list<parser::AccessId>>(x.t)}; 6830 if (accessIds.empty()) { 6831 if (prevAccessStmt_) { // C869 6832 Say("The default accessibility of this module has already been declared"_err_en_US) 6833 .Attach(*prevAccessStmt_, "Previous declaration"_en_US); 6834 } 6835 prevAccessStmt_ = currStmtSource(); 6836 defaultAccess_ = accessAttr; 6837 } else { 6838 for (const auto &accessId : accessIds) { 6839 common::visit( 6840 common::visitors{ 6841 [=](const parser::Name &y) { 6842 Resolve(y, SetAccess(y.source, accessAttr)); 6843 }, 6844 [=](const Indirection<parser::GenericSpec> &y) { 6845 auto info{GenericSpecInfo{y.value()}}; 6846 const auto &symbolName{info.symbolName()}; 6847 if (auto *symbol{FindInScope(symbolName)}) { 6848 info.Resolve(&SetAccess(symbolName, accessAttr, symbol)); 6849 } else if (info.kind().IsName()) { 6850 info.Resolve(&SetAccess(symbolName, accessAttr)); 6851 } else { 6852 Say(symbolName, "Generic spec '%s' not found"_err_en_US); 6853 } 6854 }, 6855 }, 6856 accessId.u); 6857 } 6858 } 6859 return false; 6860 } 6861 6862 // Set the access specification for this symbol. 6863 Symbol &ModuleVisitor::SetAccess( 6864 const SourceName &name, Attr attr, Symbol *symbol) { 6865 if (!symbol) { 6866 symbol = &MakeSymbol(name); 6867 } 6868 Attrs &attrs{symbol->attrs()}; 6869 if (attrs.HasAny({Attr::PUBLIC, Attr::PRIVATE})) { 6870 // PUBLIC/PRIVATE already set: make it a fatal error if it changed 6871 Attr prev = attrs.test(Attr::PUBLIC) ? Attr::PUBLIC : Attr::PRIVATE; 6872 Say(name, 6873 WithSeverity( 6874 "The accessibility of '%s' has already been specified as %s"_warn_en_US, 6875 attr != prev ? parser::Severity::Error : parser::Severity::Warning), 6876 MakeOpName(name), EnumToString(prev)); 6877 } else { 6878 attrs.set(attr); 6879 } 6880 return *symbol; 6881 } 6882 6883 static bool NeedsExplicitType(const Symbol &symbol) { 6884 if (symbol.has<UnknownDetails>()) { 6885 return true; 6886 } else if (const auto *details{symbol.detailsIf<EntityDetails>()}) { 6887 return !details->type(); 6888 } else if (const auto *details{symbol.detailsIf<ObjectEntityDetails>()}) { 6889 return !details->type(); 6890 } else if (const auto *details{symbol.detailsIf<ProcEntityDetails>()}) { 6891 return !details->interface().symbol() && !details->interface().type(); 6892 } else { 6893 return false; 6894 } 6895 } 6896 6897 bool ResolveNamesVisitor::Pre(const parser::SpecificationPart &x) { 6898 const auto &[accDecls, ompDecls, compilerDirectives, useStmts, importStmts, 6899 implicitPart, decls] = x.t; 6900 auto flagRestorer{common::ScopedSet(inSpecificationPart_, true)}; 6901 auto stateRestorer{ 6902 common::ScopedSet(specPartState_, SpecificationPartState{})}; 6903 Walk(accDecls); 6904 Walk(ompDecls); 6905 Walk(compilerDirectives); 6906 Walk(useStmts); 6907 ClearUseRenames(); 6908 ClearUseOnly(); 6909 ClearExplicitIntrinsicUses(); 6910 Walk(importStmts); 6911 Walk(implicitPart); 6912 for (const auto &decl : decls) { 6913 if (const auto *spec{ 6914 std::get_if<parser::SpecificationConstruct>(&decl.u)}) { 6915 PreSpecificationConstruct(*spec); 6916 } 6917 } 6918 Walk(decls); 6919 FinishSpecificationPart(decls); 6920 return false; 6921 } 6922 6923 // Initial processing on specification constructs, before visiting them. 6924 void ResolveNamesVisitor::PreSpecificationConstruct( 6925 const parser::SpecificationConstruct &spec) { 6926 common::visit( 6927 common::visitors{ 6928 [&](const parser::Statement<Indirection<parser::GenericStmt>> &y) { 6929 CreateGeneric(std::get<parser::GenericSpec>(y.statement.value().t)); 6930 }, 6931 [&](const Indirection<parser::InterfaceBlock> &y) { 6932 const auto &stmt{std::get<parser::Statement<parser::InterfaceStmt>>( 6933 y.value().t)}; 6934 if (const auto *spec{parser::Unwrap<parser::GenericSpec>(stmt)}) { 6935 CreateGeneric(*spec); 6936 } 6937 }, 6938 [&](const parser::Statement<parser::OtherSpecificationStmt> &y) { 6939 if (const auto *commonStmt{parser::Unwrap<parser::CommonStmt>(y)}) { 6940 CreateCommonBlockSymbols(*commonStmt); 6941 } 6942 }, 6943 [&](const auto &) {}, 6944 }, 6945 spec.u); 6946 } 6947 6948 void ResolveNamesVisitor::CreateCommonBlockSymbols( 6949 const parser::CommonStmt &commonStmt) { 6950 for (const parser::CommonStmt::Block &block : commonStmt.blocks) { 6951 const auto &[name, objects] = block.t; 6952 Symbol &commonBlock{MakeCommonBlockSymbol(name)}; 6953 for (const auto &object : objects) { 6954 Symbol &obj{DeclareObjectEntity(std::get<parser::Name>(object.t))}; 6955 if (auto *details{obj.detailsIf<ObjectEntityDetails>()}) { 6956 details->set_commonBlock(commonBlock); 6957 commonBlock.get<CommonBlockDetails>().add_object(obj); 6958 } 6959 } 6960 } 6961 } 6962 6963 void ResolveNamesVisitor::CreateGeneric(const parser::GenericSpec &x) { 6964 auto info{GenericSpecInfo{x}}; 6965 SourceName symbolName{info.symbolName()}; 6966 if (IsLogicalConstant(context(), symbolName)) { 6967 Say(symbolName, 6968 "Logical constant '%s' may not be used as a defined operator"_err_en_US); 6969 return; 6970 } 6971 GenericDetails genericDetails; 6972 Symbol *existing{nullptr}; 6973 // Check all variants of names, e.g. "operator(.ne.)" for "operator(/=)" 6974 for (const std::string &n : GetAllNames(context(), symbolName)) { 6975 existing = currScope().FindSymbol(n); 6976 if (existing) { 6977 break; 6978 } 6979 } 6980 if (existing) { 6981 Symbol &ultimate{existing->GetUltimate()}; 6982 if (const auto *existingGeneric{ultimate.detailsIf<GenericDetails>()}) { 6983 if (&ultimate.owner() != &currScope()) { 6984 // Create a local copy of a host or use associated generic so that 6985 // it can be locally extended without corrupting the original. 6986 genericDetails.CopyFrom(*existingGeneric); 6987 if (const auto *use{existing->detailsIf<UseDetails>()}) { 6988 AddGenericUse(genericDetails, existing->name(), use->symbol()); 6989 EraseSymbol(*existing); 6990 } 6991 existing = &MakeSymbol(symbolName, Attrs{}, std::move(genericDetails)); 6992 } 6993 info.Resolve(existing); 6994 return; 6995 } 6996 if (&existing->owner() == &currScope()) { 6997 if (ultimate.has<SubprogramDetails>() || 6998 ultimate.has<SubprogramNameDetails>()) { 6999 genericDetails.set_specific(ultimate); 7000 } else if (ultimate.has<DerivedTypeDetails>()) { 7001 genericDetails.set_derivedType(ultimate); 7002 } else { 7003 SayAlreadyDeclared(symbolName, *existing); 7004 return; 7005 } 7006 EraseSymbol(*existing); 7007 } 7008 } 7009 info.Resolve(&MakeSymbol(symbolName, Attrs{}, std::move(genericDetails))); 7010 } 7011 7012 void ResolveNamesVisitor::FinishSpecificationPart( 7013 const std::list<parser::DeclarationConstruct> &decls) { 7014 badStmtFuncFound_ = false; 7015 funcResultStack().CompleteFunctionResultType(); 7016 CheckImports(); 7017 bool inModule{currScope().kind() == Scope::Kind::Module}; 7018 for (auto &pair : currScope()) { 7019 auto &symbol{*pair.second}; 7020 if (NeedsExplicitType(symbol)) { 7021 ApplyImplicitRules(symbol); 7022 } 7023 if (IsDummy(symbol) && isImplicitNoneType() && 7024 symbol.test(Symbol::Flag::Implicit) && !context().HasError(symbol)) { 7025 Say(symbol.name(), 7026 "No explicit type declared for dummy argument '%s'"_err_en_US); 7027 context().SetError(symbol); 7028 } 7029 if (symbol.has<GenericDetails>()) { 7030 CheckGenericProcedures(symbol); 7031 } 7032 if (inModule && symbol.attrs().test(Attr::EXTERNAL) && 7033 !symbol.test(Symbol::Flag::Function) && 7034 !symbol.test(Symbol::Flag::Subroutine)) { 7035 // in a module, external proc without return type is subroutine 7036 symbol.set( 7037 symbol.GetType() ? Symbol::Flag::Function : Symbol::Flag::Subroutine); 7038 } 7039 if (!symbol.has<HostAssocDetails>()) { 7040 CheckPossibleBadForwardRef(symbol); 7041 } 7042 } 7043 currScope().InstantiateDerivedTypes(); 7044 for (const auto &decl : decls) { 7045 if (const auto *statement{std::get_if< 7046 parser::Statement<common::Indirection<parser::StmtFunctionStmt>>>( 7047 &decl.u)}) { 7048 AnalyzeStmtFunctionStmt(statement->statement.value()); 7049 } 7050 } 7051 // TODO: what about instantiations in BLOCK? 7052 CheckSaveStmts(); 7053 CheckCommonBlocks(); 7054 if (!inInterfaceBlock()) { 7055 // TODO: warn for the case where the EQUIVALENCE statement is in a 7056 // procedure declaration in an interface block 7057 CheckEquivalenceSets(); 7058 } 7059 } 7060 7061 // Analyze the bodies of statement functions now that the symbols in this 7062 // specification part have been fully declared and implicitly typed. 7063 void ResolveNamesVisitor::AnalyzeStmtFunctionStmt( 7064 const parser::StmtFunctionStmt &stmtFunc) { 7065 Symbol *symbol{std::get<parser::Name>(stmtFunc.t).symbol}; 7066 if (!symbol || !symbol->has<SubprogramDetails>()) { 7067 return; 7068 } 7069 auto &details{symbol->get<SubprogramDetails>()}; 7070 auto expr{AnalyzeExpr( 7071 context(), std::get<parser::Scalar<parser::Expr>>(stmtFunc.t))}; 7072 if (!expr) { 7073 context().SetError(*symbol); 7074 return; 7075 } 7076 if (auto type{evaluate::DynamicType::From(*symbol)}) { 7077 auto converted{ConvertToType(*type, std::move(*expr))}; 7078 if (!converted) { 7079 context().SetError(*symbol); 7080 return; 7081 } 7082 details.set_stmtFunction(std::move(*converted)); 7083 } else { 7084 details.set_stmtFunction(std::move(*expr)); 7085 } 7086 } 7087 7088 void ResolveNamesVisitor::CheckImports() { 7089 auto &scope{currScope()}; 7090 switch (scope.GetImportKind()) { 7091 case common::ImportKind::None: 7092 break; 7093 case common::ImportKind::All: 7094 // C8102: all entities in host must not be hidden 7095 for (const auto &pair : scope.parent()) { 7096 auto &name{pair.first}; 7097 std::optional<SourceName> scopeName{scope.GetName()}; 7098 if (!scopeName || name != *scopeName) { 7099 CheckImport(prevImportStmt_.value(), name); 7100 } 7101 } 7102 break; 7103 case common::ImportKind::Default: 7104 case common::ImportKind::Only: 7105 // C8102: entities named in IMPORT must not be hidden 7106 for (auto &name : scope.importNames()) { 7107 CheckImport(name, name); 7108 } 7109 break; 7110 } 7111 } 7112 7113 void ResolveNamesVisitor::CheckImport( 7114 const SourceName &location, const SourceName &name) { 7115 if (auto *symbol{FindInScope(name)}) { 7116 const Symbol &ultimate{symbol->GetUltimate()}; 7117 if (&ultimate.owner() == &currScope()) { 7118 Say(location, "'%s' from host is not accessible"_err_en_US, name) 7119 .Attach(symbol->name(), "'%s' is hidden by this entity"_en_US, 7120 symbol->name()); 7121 } 7122 } 7123 } 7124 7125 bool ResolveNamesVisitor::Pre(const parser::ImplicitStmt &x) { 7126 return CheckNotInBlock("IMPLICIT") && // C1107 7127 ImplicitRulesVisitor::Pre(x); 7128 } 7129 7130 void ResolveNamesVisitor::Post(const parser::PointerObject &x) { 7131 common::visit(common::visitors{ 7132 [&](const parser::Name &x) { ResolveName(x); }, 7133 [&](const parser::StructureComponent &x) { 7134 ResolveStructureComponent(x); 7135 }, 7136 }, 7137 x.u); 7138 } 7139 void ResolveNamesVisitor::Post(const parser::AllocateObject &x) { 7140 common::visit(common::visitors{ 7141 [&](const parser::Name &x) { ResolveName(x); }, 7142 [&](const parser::StructureComponent &x) { 7143 ResolveStructureComponent(x); 7144 }, 7145 }, 7146 x.u); 7147 } 7148 7149 bool ResolveNamesVisitor::Pre(const parser::PointerAssignmentStmt &x) { 7150 const auto &dataRef{std::get<parser::DataRef>(x.t)}; 7151 const auto &bounds{std::get<parser::PointerAssignmentStmt::Bounds>(x.t)}; 7152 const auto &expr{std::get<parser::Expr>(x.t)}; 7153 ResolveDataRef(dataRef); 7154 Walk(bounds); 7155 // Resolve unrestricted specific intrinsic procedures as in "p => cos". 7156 if (const parser::Name * name{parser::Unwrap<parser::Name>(expr)}) { 7157 if (NameIsKnownOrIntrinsic(*name)) { 7158 // If the name is known because it is an object entity from a host 7159 // procedure, create a host associated symbol. 7160 if (Symbol * symbol{name->symbol}; symbol && 7161 symbol->GetUltimate().has<ObjectEntityDetails>() && 7162 IsUplevelReference(*symbol)) { 7163 MakeHostAssocSymbol(*name, *symbol); 7164 } 7165 return false; 7166 } 7167 } 7168 Walk(expr); 7169 return false; 7170 } 7171 void ResolveNamesVisitor::Post(const parser::Designator &x) { 7172 ResolveDesignator(x); 7173 } 7174 7175 void ResolveNamesVisitor::Post(const parser::ProcComponentRef &x) { 7176 ResolveStructureComponent(x.v.thing); 7177 } 7178 void ResolveNamesVisitor::Post(const parser::TypeGuardStmt &x) { 7179 DeclTypeSpecVisitor::Post(x); 7180 ConstructVisitor::Post(x); 7181 } 7182 bool ResolveNamesVisitor::Pre(const parser::StmtFunctionStmt &x) { 7183 CheckNotInBlock("STATEMENT FUNCTION"); // C1107 7184 if (HandleStmtFunction(x)) { 7185 return false; 7186 } else { 7187 // This is an array element assignment: resolve names of indices 7188 const auto &names{std::get<std::list<parser::Name>>(x.t)}; 7189 for (auto &name : names) { 7190 ResolveName(name); 7191 } 7192 return true; 7193 } 7194 } 7195 7196 bool ResolveNamesVisitor::Pre(const parser::DefinedOpName &x) { 7197 const parser::Name &name{x.v}; 7198 if (FindSymbol(name)) { 7199 // OK 7200 } else if (IsLogicalConstant(context(), name.source)) { 7201 Say(name, 7202 "Logical constant '%s' may not be used as a defined operator"_err_en_US); 7203 } else { 7204 // Resolved later in expression semantics 7205 MakePlaceholder(name, MiscDetails::Kind::TypeBoundDefinedOp); 7206 } 7207 return false; 7208 } 7209 7210 void ResolveNamesVisitor::Post(const parser::AssignStmt &x) { 7211 if (auto *name{ResolveName(std::get<parser::Name>(x.t))}) { 7212 ConvertToObjectEntity(DEREF(name->symbol)); 7213 } 7214 } 7215 void ResolveNamesVisitor::Post(const parser::AssignedGotoStmt &x) { 7216 if (auto *name{ResolveName(std::get<parser::Name>(x.t))}) { 7217 ConvertToObjectEntity(DEREF(name->symbol)); 7218 } 7219 } 7220 7221 bool ResolveNamesVisitor::Pre(const parser::ProgramUnit &x) { 7222 if (std::holds_alternative<common::Indirection<parser::CompilerDirective>>( 7223 x.u)) { 7224 // TODO: global directives 7225 return true; 7226 } 7227 auto root{ProgramTree::Build(x)}; 7228 SetScope(topScope_); 7229 ResolveSpecificationParts(root); 7230 FinishSpecificationParts(root); 7231 inExecutionPart_ = true; 7232 ResolveExecutionParts(root); 7233 inExecutionPart_ = false; 7234 ResolveAccParts(context(), x); 7235 ResolveOmpParts(context(), x); 7236 return false; 7237 } 7238 7239 // References to procedures need to record that their symbols are known 7240 // to be procedures, so that they don't get converted to objects by default. 7241 class ExecutionPartSkimmer { 7242 public: 7243 explicit ExecutionPartSkimmer(ResolveNamesVisitor &resolver) 7244 : resolver_{resolver} {} 7245 7246 void Walk(const parser::ExecutionPart *exec) { 7247 if (exec) { 7248 parser::Walk(*exec, *this); 7249 } 7250 } 7251 7252 template <typename A> bool Pre(const A &) { return true; } 7253 template <typename A> void Post(const A &) {} 7254 void Post(const parser::FunctionReference &fr) { 7255 resolver_.NoteExecutablePartCall(Symbol::Flag::Function, fr.v); 7256 } 7257 void Post(const parser::CallStmt &cs) { 7258 resolver_.NoteExecutablePartCall(Symbol::Flag::Subroutine, cs.v); 7259 } 7260 7261 private: 7262 ResolveNamesVisitor &resolver_; 7263 }; 7264 7265 // Build the scope tree and resolve names in the specification parts of this 7266 // node and its children 7267 void ResolveNamesVisitor::ResolveSpecificationParts(ProgramTree &node) { 7268 if (node.isSpecificationPartResolved()) { 7269 return; // been here already 7270 } 7271 node.set_isSpecificationPartResolved(); 7272 if (!BeginScopeForNode(node)) { 7273 return; // an error prevented scope from being created 7274 } 7275 Scope &scope{currScope()}; 7276 node.set_scope(scope); 7277 AddSubpNames(node); 7278 common::visit( 7279 [&](const auto *x) { 7280 if (x) { 7281 Walk(*x); 7282 } 7283 }, 7284 node.stmt()); 7285 Walk(node.spec()); 7286 // If this is a function, convert result to an object. This is to prevent the 7287 // result from being converted later to a function symbol if it is called 7288 // inside the function. 7289 // If the result is function pointer, then ConvertToObjectEntity will not 7290 // convert the result to an object, and calling the symbol inside the function 7291 // will result in calls to the result pointer. 7292 // A function cannot be called recursively if RESULT was not used to define a 7293 // distinct result name (15.6.2.2 point 4.). 7294 if (Symbol * symbol{scope.symbol()}) { 7295 if (auto *details{symbol->detailsIf<SubprogramDetails>()}) { 7296 if (details->isFunction()) { 7297 ConvertToObjectEntity(const_cast<Symbol &>(details->result())); 7298 } 7299 } 7300 } 7301 if (node.IsModule()) { 7302 ApplyDefaultAccess(); 7303 } 7304 for (auto &child : node.children()) { 7305 ResolveSpecificationParts(child); 7306 } 7307 ExecutionPartSkimmer{*this}.Walk(node.exec()); 7308 EndScopeForNode(node); 7309 // Ensure that every object entity has a type. 7310 for (auto &pair : *node.scope()) { 7311 ApplyImplicitRules(*pair.second); 7312 } 7313 } 7314 7315 // Add SubprogramNameDetails symbols for module and internal subprograms and 7316 // their ENTRY statements. 7317 void ResolveNamesVisitor::AddSubpNames(ProgramTree &node) { 7318 auto kind{ 7319 node.IsModule() ? SubprogramKind::Module : SubprogramKind::Internal}; 7320 for (auto &child : node.children()) { 7321 auto &symbol{MakeSymbol(child.name(), SubprogramNameDetails{kind, child})}; 7322 auto childKind{child.GetKind()}; 7323 if (childKind == ProgramTree::Kind::Function) { 7324 symbol.set(Symbol::Flag::Function); 7325 } else if (childKind == ProgramTree::Kind::Subroutine) { 7326 symbol.set(Symbol::Flag::Subroutine); 7327 } 7328 for (const auto &entryStmt : child.entryStmts()) { 7329 SubprogramNameDetails details{kind, child}; 7330 details.set_isEntryStmt(); 7331 auto &symbol{ 7332 MakeSymbol(std::get<parser::Name>(entryStmt->t), std::move(details))}; 7333 symbol.set(child.GetSubpFlag()); 7334 } 7335 } 7336 for (const auto &generic : node.genericSpecs()) { 7337 if (const auto *name{std::get_if<parser::Name>(&generic->u)}) { 7338 if (currScope().find(name->source) != currScope().end()) { 7339 // If this scope has both a generic interface and a contained 7340 // subprogram with the same name, create the generic's symbol 7341 // now so that any other generics of the same name that are pulled 7342 // into scope later via USE association will properly merge instead 7343 // of raising a bogus error due a conflict with the subprogram. 7344 CreateGeneric(*generic); 7345 } 7346 } 7347 } 7348 } 7349 7350 // Push a new scope for this node or return false on error. 7351 bool ResolveNamesVisitor::BeginScopeForNode(const ProgramTree &node) { 7352 switch (node.GetKind()) { 7353 SWITCH_COVERS_ALL_CASES 7354 case ProgramTree::Kind::Program: 7355 PushScope(Scope::Kind::MainProgram, 7356 &MakeSymbol(node.name(), MainProgramDetails{})); 7357 return true; 7358 case ProgramTree::Kind::Function: 7359 case ProgramTree::Kind::Subroutine: 7360 return BeginSubprogram(node.name(), node.GetSubpFlag(), 7361 node.HasModulePrefix(), node.bindingSpec()); 7362 case ProgramTree::Kind::MpSubprogram: 7363 return BeginMpSubprogram(node.name()); 7364 case ProgramTree::Kind::Module: 7365 BeginModule(node.name(), false); 7366 return true; 7367 case ProgramTree::Kind::Submodule: 7368 return BeginSubmodule(node.name(), node.GetParentId()); 7369 case ProgramTree::Kind::BlockData: 7370 PushBlockDataScope(node.name()); 7371 return true; 7372 } 7373 } 7374 7375 void ResolveNamesVisitor::EndScopeForNode(const ProgramTree &node) { 7376 EndSubprogram(); 7377 } 7378 7379 // Some analyses and checks, such as the processing of initializers of 7380 // pointers, are deferred until all of the pertinent specification parts 7381 // have been visited. This deferred processing enables the use of forward 7382 // references in these circumstances. 7383 class DeferredCheckVisitor { 7384 public: 7385 explicit DeferredCheckVisitor(ResolveNamesVisitor &resolver) 7386 : resolver_{resolver} {} 7387 7388 template <typename A> void Walk(const A &x) { parser::Walk(x, *this); } 7389 7390 template <typename A> bool Pre(const A &) { return true; } 7391 template <typename A> void Post(const A &) {} 7392 7393 void Post(const parser::DerivedTypeStmt &x) { 7394 const auto &name{std::get<parser::Name>(x.t)}; 7395 if (Symbol * symbol{name.symbol}) { 7396 if (Scope * scope{symbol->scope()}) { 7397 if (scope->IsDerivedType()) { 7398 resolver_.PushScope(*scope); 7399 pushedScope_ = true; 7400 } 7401 } 7402 } 7403 } 7404 void Post(const parser::EndTypeStmt &) { 7405 if (pushedScope_) { 7406 resolver_.PopScope(); 7407 pushedScope_ = false; 7408 } 7409 } 7410 7411 void Post(const parser::ProcInterface &pi) { 7412 if (const auto *name{std::get_if<parser::Name>(&pi.u)}) { 7413 resolver_.CheckExplicitInterface(*name); 7414 } 7415 } 7416 bool Pre(const parser::EntityDecl &decl) { 7417 Init(std::get<parser::Name>(decl.t), 7418 std::get<std::optional<parser::Initialization>>(decl.t)); 7419 return false; 7420 } 7421 bool Pre(const parser::ComponentDecl &decl) { 7422 Init(std::get<parser::Name>(decl.t), 7423 std::get<std::optional<parser::Initialization>>(decl.t)); 7424 return false; 7425 } 7426 bool Pre(const parser::ProcDecl &decl) { 7427 if (const auto &init{ 7428 std::get<std::optional<parser::ProcPointerInit>>(decl.t)}) { 7429 resolver_.PointerInitialization(std::get<parser::Name>(decl.t), *init); 7430 } 7431 return false; 7432 } 7433 void Post(const parser::TypeBoundProcedureStmt::WithInterface &tbps) { 7434 resolver_.CheckExplicitInterface(tbps.interfaceName); 7435 } 7436 void Post(const parser::TypeBoundProcedureStmt::WithoutInterface &tbps) { 7437 if (pushedScope_) { 7438 resolver_.CheckBindings(tbps); 7439 } 7440 } 7441 7442 private: 7443 void Init(const parser::Name &name, 7444 const std::optional<parser::Initialization> &init) { 7445 if (init) { 7446 if (const auto *target{ 7447 std::get_if<parser::InitialDataTarget>(&init->u)}) { 7448 resolver_.PointerInitialization(name, *target); 7449 } 7450 } 7451 } 7452 7453 ResolveNamesVisitor &resolver_; 7454 bool pushedScope_{false}; 7455 }; 7456 7457 // Perform checks and completions that need to happen after all of 7458 // the specification parts but before any of the execution parts. 7459 void ResolveNamesVisitor::FinishSpecificationParts(const ProgramTree &node) { 7460 if (!node.scope()) { 7461 return; // error occurred creating scope 7462 } 7463 SetScope(*node.scope()); 7464 // The initializers of pointers, the default initializers of pointer 7465 // components, and non-deferred type-bound procedure bindings have not 7466 // yet been traversed. 7467 // We do that now, when any (formerly) forward references that appear 7468 // in those initializers will resolve to the right symbols without 7469 // incurring spurious errors with IMPLICIT NONE. 7470 DeferredCheckVisitor{*this}.Walk(node.spec()); 7471 DeferredCheckVisitor{*this}.Walk(node.exec()); // for BLOCK 7472 for (Scope &childScope : currScope().children()) { 7473 if (childScope.IsParameterizedDerivedTypeInstantiation()) { 7474 FinishDerivedTypeInstantiation(childScope); 7475 } 7476 } 7477 for (const auto &child : node.children()) { 7478 FinishSpecificationParts(child); 7479 } 7480 } 7481 7482 // Duplicate and fold component object pointer default initializer designators 7483 // using the actual type parameter values of each particular instantiation. 7484 // Validation is done later in declaration checking. 7485 void ResolveNamesVisitor::FinishDerivedTypeInstantiation(Scope &scope) { 7486 CHECK(scope.IsDerivedType() && !scope.symbol()); 7487 if (DerivedTypeSpec * spec{scope.derivedTypeSpec()}) { 7488 spec->Instantiate(currScope()); 7489 const Symbol &origTypeSymbol{spec->typeSymbol()}; 7490 if (const Scope * origTypeScope{origTypeSymbol.scope()}) { 7491 CHECK(origTypeScope->IsDerivedType() && 7492 origTypeScope->symbol() == &origTypeSymbol); 7493 auto &foldingContext{GetFoldingContext()}; 7494 auto restorer{foldingContext.WithPDTInstance(*spec)}; 7495 for (auto &pair : scope) { 7496 Symbol &comp{*pair.second}; 7497 const Symbol &origComp{DEREF(FindInScope(*origTypeScope, comp.name()))}; 7498 if (IsPointer(comp)) { 7499 if (auto *details{comp.detailsIf<ObjectEntityDetails>()}) { 7500 auto origDetails{origComp.get<ObjectEntityDetails>()}; 7501 if (const MaybeExpr & init{origDetails.init()}) { 7502 SomeExpr newInit{*init}; 7503 MaybeExpr folded{ 7504 evaluate::Fold(foldingContext, std::move(newInit))}; 7505 details->set_init(std::move(folded)); 7506 } 7507 } 7508 } 7509 } 7510 } 7511 } 7512 } 7513 7514 // Resolve names in the execution part of this node and its children 7515 void ResolveNamesVisitor::ResolveExecutionParts(const ProgramTree &node) { 7516 if (!node.scope()) { 7517 return; // error occurred creating scope 7518 } 7519 SetScope(*node.scope()); 7520 if (const auto *exec{node.exec()}) { 7521 Walk(*exec); 7522 } 7523 FinishNamelists(); 7524 PopScope(); // converts unclassified entities into objects 7525 for (const auto &child : node.children()) { 7526 ResolveExecutionParts(child); 7527 } 7528 } 7529 7530 void ResolveNamesVisitor::Post(const parser::Program &) { 7531 // ensure that all temps were deallocated 7532 CHECK(!attrs_); 7533 CHECK(!GetDeclTypeSpec()); 7534 } 7535 7536 // A singleton instance of the scope -> IMPLICIT rules mapping is 7537 // shared by all instances of ResolveNamesVisitor and accessed by this 7538 // pointer when the visitors (other than the top-level original) are 7539 // constructed. 7540 static ImplicitRulesMap *sharedImplicitRulesMap{nullptr}; 7541 7542 bool ResolveNames( 7543 SemanticsContext &context, const parser::Program &program, Scope &top) { 7544 ImplicitRulesMap implicitRulesMap; 7545 auto restorer{common::ScopedSet(sharedImplicitRulesMap, &implicitRulesMap)}; 7546 ResolveNamesVisitor{context, implicitRulesMap, top}.Walk(program); 7547 return !context.AnyFatalError(); 7548 } 7549 7550 // Processes a module (but not internal) function when it is referenced 7551 // in a specification expression in a sibling procedure. 7552 void ResolveSpecificationParts( 7553 SemanticsContext &context, const Symbol &subprogram) { 7554 auto originalLocation{context.location()}; 7555 ImplicitRulesMap implicitRulesMap; 7556 bool localImplicitRulesMap{false}; 7557 if (!sharedImplicitRulesMap) { 7558 sharedImplicitRulesMap = &implicitRulesMap; 7559 localImplicitRulesMap = true; 7560 } 7561 ResolveNamesVisitor visitor{ 7562 context, *sharedImplicitRulesMap, context.globalScope()}; 7563 const auto &details{subprogram.get<SubprogramNameDetails>()}; 7564 ProgramTree &node{details.node()}; 7565 const Scope &moduleScope{subprogram.owner()}; 7566 if (localImplicitRulesMap) { 7567 visitor.BeginScope(const_cast<Scope &>(moduleScope)); 7568 } else { 7569 visitor.SetScope(const_cast<Scope &>(moduleScope)); 7570 } 7571 visitor.ResolveSpecificationParts(node); 7572 context.set_location(std::move(originalLocation)); 7573 if (localImplicitRulesMap) { 7574 sharedImplicitRulesMap = nullptr; 7575 } 7576 } 7577 7578 } // namespace Fortran::semantics 7579