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 explicit FuncInfo(const Scope &s) : scope{s} {} 468 const Scope &scope; 469 // Parse tree of the type specification in the FUNCTION prefix 470 const parser::DeclarationTypeSpec *parsedType{nullptr}; 471 // Name of the function RESULT in the FUNCTION suffix, if any 472 const parser::Name *resultName{nullptr}; 473 // Result symbol 474 Symbol *resultSymbol{nullptr}; 475 std::optional<SourceName> source; 476 bool inFunctionStmt{false}; // true between Pre/Post of FunctionStmt 477 }; 478 479 // Completes the definition of the top function's result. 480 void CompleteFunctionResultType(); 481 // Completes the definition of a symbol if it is the top function's result. 482 void CompleteTypeIfFunctionResult(Symbol &); 483 484 FuncInfo *Top() { return stack_.empty() ? nullptr : &stack_.back(); } 485 FuncInfo &Push(const Scope &scope) { return stack_.emplace_back(scope); } 486 void Pop(); 487 488 private: 489 ScopeHandler &scopeHandler_; 490 std::vector<FuncInfo> stack_; 491 }; 492 493 // Manage a stack of Scopes 494 class ScopeHandler : public ImplicitRulesVisitor { 495 public: 496 using ImplicitRulesVisitor::Post; 497 using ImplicitRulesVisitor::Pre; 498 499 Scope &currScope() { return DEREF(currScope_); } 500 // The enclosing host procedure if current scope is in an internal procedure 501 Scope *GetHostProcedure(); 502 // The innermost enclosing program unit scope, ignoring BLOCK and other 503 // construct scopes. 504 Scope &InclusiveScope(); 505 // The enclosing scope, skipping derived types. 506 Scope &NonDerivedTypeScope(); 507 508 // Create a new scope and push it on the scope stack. 509 void PushScope(Scope::Kind kind, Symbol *symbol); 510 void PushScope(Scope &scope); 511 void PopScope(); 512 void SetScope(Scope &); 513 514 template <typename T> bool Pre(const parser::Statement<T> &x) { 515 messageHandler().set_currStmtSource(x.source); 516 currScope_->AddSourceRange(x.source); 517 return true; 518 } 519 template <typename T> void Post(const parser::Statement<T> &) { 520 messageHandler().set_currStmtSource(std::nullopt); 521 } 522 523 // Special messages: already declared; referencing symbol's declaration; 524 // about a type; two names & locations 525 void SayAlreadyDeclared(const parser::Name &, Symbol &); 526 void SayAlreadyDeclared(const SourceName &, Symbol &); 527 void SayAlreadyDeclared(const SourceName &, const SourceName &); 528 void SayWithReason( 529 const parser::Name &, Symbol &, MessageFixedText &&, Message &&); 530 void SayWithDecl(const parser::Name &, Symbol &, MessageFixedText &&); 531 void SayLocalMustBeVariable(const parser::Name &, Symbol &); 532 void SayDerivedType(const SourceName &, MessageFixedText &&, const Scope &); 533 void Say2(const SourceName &, MessageFixedText &&, const SourceName &, 534 MessageFixedText &&); 535 void Say2( 536 const SourceName &, MessageFixedText &&, Symbol &, MessageFixedText &&); 537 void Say2( 538 const parser::Name &, MessageFixedText &&, Symbol &, MessageFixedText &&); 539 540 // Search for symbol by name in current, parent derived type, and 541 // containing scopes 542 Symbol *FindSymbol(const parser::Name &); 543 Symbol *FindSymbol(const Scope &, const parser::Name &); 544 // Search for name only in scope, not in enclosing scopes. 545 Symbol *FindInScope(const Scope &, const parser::Name &); 546 Symbol *FindInScope(const Scope &, const SourceName &); 547 template <typename T> Symbol *FindInScope(const T &name) { 548 return FindInScope(currScope(), name); 549 } 550 // Search for name in a derived type scope and its parents. 551 Symbol *FindInTypeOrParents(const Scope &, const parser::Name &); 552 Symbol *FindInTypeOrParents(const parser::Name &); 553 void EraseSymbol(const parser::Name &); 554 void EraseSymbol(const Symbol &symbol) { currScope().erase(symbol.name()); } 555 // Make a new symbol with the name and attrs of an existing one 556 Symbol &CopySymbol(const SourceName &, const Symbol &); 557 558 // Make symbols in the current or named scope 559 Symbol &MakeSymbol(Scope &, const SourceName &, Attrs); 560 Symbol &MakeSymbol(const SourceName &, Attrs = Attrs{}); 561 Symbol &MakeSymbol(const parser::Name &, Attrs = Attrs{}); 562 Symbol &MakeHostAssocSymbol(const parser::Name &, const Symbol &); 563 564 template <typename D> 565 common::IfNoLvalue<Symbol &, D> MakeSymbol( 566 const parser::Name &name, D &&details) { 567 return MakeSymbol(name, Attrs{}, std::move(details)); 568 } 569 570 template <typename D> 571 common::IfNoLvalue<Symbol &, D> MakeSymbol( 572 const parser::Name &name, const Attrs &attrs, D &&details) { 573 return Resolve(name, MakeSymbol(name.source, attrs, std::move(details))); 574 } 575 576 template <typename D> 577 common::IfNoLvalue<Symbol &, D> MakeSymbol( 578 const SourceName &name, const Attrs &attrs, D &&details) { 579 // Note: don't use FindSymbol here. If this is a derived type scope, 580 // we want to detect whether the name is already declared as a component. 581 auto *symbol{FindInScope(name)}; 582 if (!symbol) { 583 symbol = &MakeSymbol(name, attrs); 584 symbol->set_details(std::move(details)); 585 return *symbol; 586 } 587 if constexpr (std::is_same_v<DerivedTypeDetails, D>) { 588 if (auto *d{symbol->detailsIf<GenericDetails>()}) { 589 if (!d->specific()) { 590 // derived type with same name as a generic 591 auto *derivedType{d->derivedType()}; 592 if (!derivedType) { 593 derivedType = 594 &currScope().MakeSymbol(name, attrs, std::move(details)); 595 d->set_derivedType(*derivedType); 596 } else if (derivedType->CanReplaceDetails(details)) { 597 // was forward-referenced 598 derivedType->attrs() |= attrs; 599 derivedType->set_details(std::move(details)); 600 } else { 601 SayAlreadyDeclared(name, *derivedType); 602 } 603 return *derivedType; 604 } 605 } 606 } 607 if (symbol->CanReplaceDetails(details)) { 608 // update the existing symbol 609 symbol->attrs() |= attrs; 610 if constexpr (std::is_same_v<SubprogramDetails, D>) { 611 // Dummy argument defined by explicit interface 612 details.set_isDummy(IsDummy(*symbol)); 613 } 614 symbol->set_details(std::move(details)); 615 return *symbol; 616 } else if constexpr (std::is_same_v<UnknownDetails, D>) { 617 symbol->attrs() |= attrs; 618 return *symbol; 619 } else { 620 if (!CheckPossibleBadForwardRef(*symbol)) { 621 if (name.empty() && symbol->name().empty()) { 622 // report the error elsewhere 623 return *symbol; 624 } 625 SayAlreadyDeclared(name, *symbol); 626 } 627 // replace the old symbol with a new one with correct details 628 EraseSymbol(*symbol); 629 auto &result{MakeSymbol(name, attrs, std::move(details))}; 630 context().SetError(result); 631 return result; 632 } 633 } 634 635 void MakeExternal(Symbol &); 636 637 protected: 638 FuncResultStack &funcResultStack() { return funcResultStack_; } 639 640 // Apply the implicit type rules to this symbol. 641 void ApplyImplicitRules(Symbol &, bool allowForwardReference = false); 642 bool ImplicitlyTypeForwardRef(Symbol &); 643 void AcquireIntrinsicProcedureFlags(Symbol &); 644 const DeclTypeSpec *GetImplicitType( 645 Symbol &, bool respectImplicitNoneType = true); 646 bool ConvertToObjectEntity(Symbol &); 647 bool ConvertToProcEntity(Symbol &); 648 649 const DeclTypeSpec &MakeNumericType( 650 TypeCategory, const std::optional<parser::KindSelector> &); 651 const DeclTypeSpec &MakeLogicalType( 652 const std::optional<parser::KindSelector> &); 653 void NotePossibleBadForwardRef(const parser::Name &); 654 std::optional<SourceName> HadForwardRef(const Symbol &) const; 655 bool CheckPossibleBadForwardRef(const Symbol &); 656 657 bool inSpecificationPart_{false}; 658 bool inEquivalenceStmt_{false}; 659 660 // Some information is collected from a specification part for deferred 661 // processing in DeclarationPartVisitor functions (e.g., CheckSaveStmts()) 662 // that are called by ResolveNamesVisitor::FinishSpecificationPart(). Since 663 // specification parts can nest (e.g., INTERFACE bodies), the collected 664 // information that is not contained in the scope needs to be packaged 665 // and restorable. 666 struct SpecificationPartState { 667 std::set<SourceName> forwardRefs; 668 // Collect equivalence sets and process at end of specification part 669 std::vector<const std::list<parser::EquivalenceObject> *> equivalenceSets; 670 // Names of all common block objects in the scope 671 std::set<SourceName> commonBlockObjects; 672 // Info about about SAVE statements and attributes in current scope 673 struct { 674 std::optional<SourceName> saveAll; // "SAVE" without entity list 675 std::set<SourceName> entities; // names of entities with save attr 676 std::set<SourceName> commons; // names of common blocks with save attr 677 } saveInfo; 678 } specPartState_; 679 680 // Some declaration processing can and should be deferred to 681 // ResolveExecutionParts() to avoid prematurely creating implicitly-typed 682 // local symbols that should be host associations. 683 struct DeferredDeclarationState { 684 // The content of each namelist group 685 std::list<const parser::NamelistStmt::Group *> namelistGroups; 686 }; 687 DeferredDeclarationState *GetDeferredDeclarationState(bool add = false) { 688 if (!add && deferred_.find(&currScope()) == deferred_.end()) { 689 return nullptr; 690 } else { 691 return &deferred_.emplace(&currScope(), DeferredDeclarationState{}) 692 .first->second; 693 } 694 } 695 696 private: 697 Scope *currScope_{nullptr}; 698 FuncResultStack funcResultStack_{*this}; 699 std::map<Scope *, DeferredDeclarationState> deferred_; 700 }; 701 702 class ModuleVisitor : public virtual ScopeHandler { 703 public: 704 bool Pre(const parser::AccessStmt &); 705 bool Pre(const parser::Only &); 706 bool Pre(const parser::Rename::Names &); 707 bool Pre(const parser::Rename::Operators &); 708 bool Pre(const parser::UseStmt &); 709 void Post(const parser::UseStmt &); 710 711 void BeginModule(const parser::Name &, bool isSubmodule); 712 bool BeginSubmodule(const parser::Name &, const parser::ParentIdentifier &); 713 void ApplyDefaultAccess(); 714 Symbol &AddGenericUse(GenericDetails &, const SourceName &, const Symbol &); 715 void AddAndCheckExplicitIntrinsicUse(SourceName, bool isIntrinsic); 716 void ClearUseRenames() { useRenames_.clear(); } 717 void ClearUseOnly() { useOnly_.clear(); } 718 void ClearExplicitIntrinsicUses() { 719 explicitIntrinsicUses_.clear(); 720 explicitNonIntrinsicUses_.clear(); 721 } 722 723 private: 724 // The default access spec for this module. 725 Attr defaultAccess_{Attr::PUBLIC}; 726 // The location of the last AccessStmt without access-ids, if any. 727 std::optional<SourceName> prevAccessStmt_; 728 // The scope of the module during a UseStmt 729 Scope *useModuleScope_{nullptr}; 730 // Names that have appeared in a rename clause of a USE statement 731 std::set<std::pair<SourceName, Scope *>> useRenames_; 732 // Names that have appeared in an ONLY clause of a USE statement 733 std::set<std::pair<SourceName, Scope *>> useOnly_; 734 // Module names that have appeared in USE statements with explicit 735 // INTRINSIC or NON_INTRINSIC keywords 736 std::set<SourceName> explicitIntrinsicUses_; 737 std::set<SourceName> explicitNonIntrinsicUses_; 738 739 Symbol &SetAccess(const SourceName &, Attr attr, Symbol * = nullptr); 740 // A rename in a USE statement: local => use 741 struct SymbolRename { 742 Symbol *local{nullptr}; 743 Symbol *use{nullptr}; 744 }; 745 // Record a use from useModuleScope_ of use Name/Symbol as local Name/Symbol 746 SymbolRename AddUse(const SourceName &localName, const SourceName &useName); 747 SymbolRename AddUse(const SourceName &, const SourceName &, Symbol *); 748 void DoAddUse( 749 SourceName, SourceName, Symbol &localSymbol, const Symbol &useSymbol); 750 void AddUse(const GenericSpecInfo &); 751 // If appropriate, erase a previously USE-associated symbol 752 void EraseRenamedSymbol(const Symbol &); 753 // Record a name appearing in a USE rename clause 754 void AddUseRename(const SourceName &name) { 755 useRenames_.emplace(std::make_pair(name, useModuleScope_)); 756 } 757 bool IsUseRenamed(const SourceName &name) const { 758 return useRenames_.find({name, useModuleScope_}) != useRenames_.end(); 759 } 760 // Record a name appearing in a USE ONLY clause 761 void AddUseOnly(const SourceName &name) { 762 useOnly_.emplace(std::make_pair(name, useModuleScope_)); 763 } 764 bool IsUseOnly(const SourceName &name) const { 765 return useOnly_.find({name, useModuleScope_}) != useOnly_.end(); 766 } 767 Scope *FindModule(const parser::Name &, std::optional<bool> isIntrinsic, 768 Scope *ancestor = nullptr); 769 }; 770 771 class InterfaceVisitor : public virtual ScopeHandler { 772 public: 773 bool Pre(const parser::InterfaceStmt &); 774 void Post(const parser::InterfaceStmt &); 775 void Post(const parser::EndInterfaceStmt &); 776 bool Pre(const parser::GenericSpec &); 777 bool Pre(const parser::ProcedureStmt &); 778 bool Pre(const parser::GenericStmt &); 779 void Post(const parser::GenericStmt &); 780 781 bool inInterfaceBlock() const; 782 bool isGeneric() const; 783 bool isAbstract() const; 784 785 protected: 786 Symbol &GetGenericSymbol() { return DEREF(genericInfo_.top().symbol); } 787 // Add to generic the symbol for the subprogram with the same name 788 void CheckGenericProcedures(Symbol &); 789 790 private: 791 // A new GenericInfo is pushed for each interface block and generic stmt 792 struct GenericInfo { 793 GenericInfo(bool isInterface, bool isAbstract = false) 794 : isInterface{isInterface}, isAbstract{isAbstract} {} 795 bool isInterface; // in interface block 796 bool isAbstract; // in abstract interface block 797 Symbol *symbol{nullptr}; // the generic symbol being defined 798 }; 799 std::stack<GenericInfo> genericInfo_; 800 const GenericInfo &GetGenericInfo() const { return genericInfo_.top(); } 801 void SetGenericSymbol(Symbol &symbol) { genericInfo_.top().symbol = &symbol; } 802 803 using ProcedureKind = parser::ProcedureStmt::Kind; 804 // mapping of generic to its specific proc names and kinds 805 std::multimap<Symbol *, std::pair<const parser::Name *, ProcedureKind>> 806 specificProcs_; 807 808 void AddSpecificProcs(const std::list<parser::Name> &, ProcedureKind); 809 void ResolveSpecificsInGeneric(Symbol &generic); 810 }; 811 812 class SubprogramVisitor : public virtual ScopeHandler, public InterfaceVisitor { 813 public: 814 bool HandleStmtFunction(const parser::StmtFunctionStmt &); 815 bool Pre(const parser::SubroutineStmt &); 816 bool Pre(const parser::FunctionStmt &); 817 void Post(const parser::FunctionStmt &); 818 bool Pre(const parser::EntryStmt &); 819 void Post(const parser::EntryStmt &); 820 bool Pre(const parser::InterfaceBody::Subroutine &); 821 void Post(const parser::InterfaceBody::Subroutine &); 822 bool Pre(const parser::InterfaceBody::Function &); 823 void Post(const parser::InterfaceBody::Function &); 824 bool Pre(const parser::Suffix &); 825 bool Pre(const parser::PrefixSpec &); 826 827 bool BeginSubprogram(const parser::Name &, Symbol::Flag, 828 bool hasModulePrefix = false, 829 const parser::LanguageBindingSpec * = nullptr, 830 const ProgramTree::EntryStmtList * = nullptr); 831 bool BeginMpSubprogram(const parser::Name &); 832 void PushBlockDataScope(const parser::Name &); 833 void EndSubprogram(std::optional<parser::CharBlock> stmtSource = std::nullopt, 834 const std::optional<parser::LanguageBindingSpec> * = nullptr); 835 836 protected: 837 // Set when we see a stmt function that is really an array element assignment 838 bool badStmtFuncFound_{false}; 839 840 private: 841 // Edits an existing symbol created for earlier calls to a subprogram or ENTRY 842 // so that it can be replaced by a later definition. 843 bool HandlePreviousCalls(const parser::Name &, Symbol &, Symbol::Flag); 844 void CheckExtantProc(const parser::Name &, Symbol::Flag); 845 // Create a subprogram symbol in the current scope and push a new scope. 846 Symbol &PushSubprogramScope(const parser::Name &, Symbol::Flag, 847 const parser::LanguageBindingSpec * = nullptr); 848 Symbol *GetSpecificFromGeneric(const parser::Name &); 849 SubprogramDetails &PostSubprogramStmt(const parser::Name &); 850 void CreateEntry(const parser::EntryStmt &stmt, Symbol &subprogram); 851 void PostEntryStmt(const parser::EntryStmt &stmt); 852 }; 853 854 class DeclarationVisitor : public ArraySpecVisitor, 855 public virtual ScopeHandler { 856 public: 857 using ArraySpecVisitor::Post; 858 using ScopeHandler::Post; 859 using ScopeHandler::Pre; 860 861 bool Pre(const parser::Initialization &); 862 void Post(const parser::EntityDecl &); 863 void Post(const parser::ObjectDecl &); 864 void Post(const parser::PointerDecl &); 865 bool Pre(const parser::BindStmt &) { return BeginAttrs(); } 866 void Post(const parser::BindStmt &) { EndAttrs(); } 867 bool Pre(const parser::BindEntity &); 868 bool Pre(const parser::OldParameterStmt &); 869 bool Pre(const parser::NamedConstantDef &); 870 bool Pre(const parser::NamedConstant &); 871 void Post(const parser::EnumDef &); 872 bool Pre(const parser::Enumerator &); 873 bool Pre(const parser::AccessSpec &); 874 bool Pre(const parser::AsynchronousStmt &); 875 bool Pre(const parser::ContiguousStmt &); 876 bool Pre(const parser::ExternalStmt &); 877 bool Pre(const parser::IntentStmt &); 878 bool Pre(const parser::IntrinsicStmt &); 879 bool Pre(const parser::OptionalStmt &); 880 bool Pre(const parser::ProtectedStmt &); 881 bool Pre(const parser::ValueStmt &); 882 bool Pre(const parser::VolatileStmt &); 883 bool Pre(const parser::AllocatableStmt &) { 884 objectDeclAttr_ = Attr::ALLOCATABLE; 885 return true; 886 } 887 void Post(const parser::AllocatableStmt &) { objectDeclAttr_ = std::nullopt; } 888 bool Pre(const parser::TargetStmt &) { 889 objectDeclAttr_ = Attr::TARGET; 890 return true; 891 } 892 void Post(const parser::TargetStmt &) { objectDeclAttr_ = std::nullopt; } 893 void Post(const parser::DimensionStmt::Declaration &); 894 void Post(const parser::CodimensionDecl &); 895 bool Pre(const parser::TypeDeclarationStmt &) { return BeginDecl(); } 896 void Post(const parser::TypeDeclarationStmt &); 897 void Post(const parser::IntegerTypeSpec &); 898 void Post(const parser::IntrinsicTypeSpec::Real &); 899 void Post(const parser::IntrinsicTypeSpec::Complex &); 900 void Post(const parser::IntrinsicTypeSpec::Logical &); 901 void Post(const parser::IntrinsicTypeSpec::Character &); 902 void Post(const parser::CharSelector::LengthAndKind &); 903 void Post(const parser::CharLength &); 904 void Post(const parser::LengthSelector &); 905 bool Pre(const parser::KindParam &); 906 bool Pre(const parser::DeclarationTypeSpec::Type &); 907 void Post(const parser::DeclarationTypeSpec::Type &); 908 bool Pre(const parser::DeclarationTypeSpec::Class &); 909 void Post(const parser::DeclarationTypeSpec::Class &); 910 void Post(const parser::DeclarationTypeSpec::Record &); 911 void Post(const parser::DerivedTypeSpec &); 912 bool Pre(const parser::DerivedTypeDef &); 913 bool Pre(const parser::DerivedTypeStmt &); 914 void Post(const parser::DerivedTypeStmt &); 915 bool Pre(const parser::TypeParamDefStmt &) { return BeginDecl(); } 916 void Post(const parser::TypeParamDefStmt &); 917 bool Pre(const parser::TypeAttrSpec::Extends &); 918 bool Pre(const parser::PrivateStmt &); 919 bool Pre(const parser::SequenceStmt &); 920 bool Pre(const parser::ComponentDefStmt &) { return BeginDecl(); } 921 void Post(const parser::ComponentDefStmt &) { EndDecl(); } 922 void Post(const parser::ComponentDecl &); 923 void Post(const parser::FillDecl &); 924 bool Pre(const parser::ProcedureDeclarationStmt &); 925 void Post(const parser::ProcedureDeclarationStmt &); 926 bool Pre(const parser::DataComponentDefStmt &); // returns false 927 bool Pre(const parser::ProcComponentDefStmt &); 928 void Post(const parser::ProcComponentDefStmt &); 929 bool Pre(const parser::ProcPointerInit &); 930 void Post(const parser::ProcInterface &); 931 void Post(const parser::ProcDecl &); 932 bool Pre(const parser::TypeBoundProcedurePart &); 933 void Post(const parser::TypeBoundProcedurePart &); 934 void Post(const parser::ContainsStmt &); 935 bool Pre(const parser::TypeBoundProcBinding &) { return BeginAttrs(); } 936 void Post(const parser::TypeBoundProcBinding &) { EndAttrs(); } 937 void Post(const parser::TypeBoundProcedureStmt::WithoutInterface &); 938 void Post(const parser::TypeBoundProcedureStmt::WithInterface &); 939 void Post(const parser::FinalProcedureStmt &); 940 bool Pre(const parser::TypeBoundGenericStmt &); 941 bool Pre(const parser::StructureDef &); // returns false 942 bool Pre(const parser::Union::UnionStmt &); 943 bool Pre(const parser::StructureField &); 944 void Post(const parser::StructureField &); 945 bool Pre(const parser::AllocateStmt &); 946 void Post(const parser::AllocateStmt &); 947 bool Pre(const parser::StructureConstructor &); 948 bool Pre(const parser::NamelistStmt::Group &); 949 bool Pre(const parser::IoControlSpec &); 950 bool Pre(const parser::CommonStmt::Block &); 951 bool Pre(const parser::CommonBlockObject &); 952 void Post(const parser::CommonBlockObject &); 953 bool Pre(const parser::EquivalenceStmt &); 954 bool Pre(const parser::SaveStmt &); 955 bool Pre(const parser::BasedPointerStmt &); 956 957 void PointerInitialization( 958 const parser::Name &, const parser::InitialDataTarget &); 959 void PointerInitialization( 960 const parser::Name &, const parser::ProcPointerInit &); 961 void NonPointerInitialization( 962 const parser::Name &, const parser::ConstantExpr &); 963 void CheckExplicitInterface(const parser::Name &); 964 void CheckBindings(const parser::TypeBoundProcedureStmt::WithoutInterface &); 965 966 const parser::Name *ResolveDesignator(const parser::Designator &); 967 968 protected: 969 bool BeginDecl(); 970 void EndDecl(); 971 Symbol &DeclareObjectEntity(const parser::Name &, Attrs = Attrs{}); 972 // Make sure that there's an entity in an enclosing scope called Name 973 Symbol &FindOrDeclareEnclosingEntity(const parser::Name &); 974 // Declare a LOCAL/LOCAL_INIT entity. If there isn't a type specified 975 // it comes from the entity in the containing scope, or implicit rules. 976 // Return pointer to the new symbol, or nullptr on error. 977 Symbol *DeclareLocalEntity(const parser::Name &); 978 // Declare a statement entity (i.e., an implied DO loop index for 979 // a DATA statement or an array constructor). If there isn't an explict 980 // type specified, implicit rules apply. Return pointer to the new symbol, 981 // or nullptr on error. 982 Symbol *DeclareStatementEntity(const parser::DoVariable &, 983 const std::optional<parser::IntegerTypeSpec> &); 984 Symbol &MakeCommonBlockSymbol(const parser::Name &); 985 Symbol &MakeCommonBlockSymbol(const std::optional<parser::Name> &); 986 bool CheckUseError(const parser::Name &); 987 void CheckAccessibility(const SourceName &, bool, Symbol &); 988 void CheckCommonBlocks(); 989 void CheckSaveStmts(); 990 void CheckEquivalenceSets(); 991 bool CheckNotInBlock(const char *); 992 bool NameIsKnownOrIntrinsic(const parser::Name &); 993 void FinishNamelists(); 994 995 // Each of these returns a pointer to a resolved Name (i.e. with symbol) 996 // or nullptr in case of error. 997 const parser::Name *ResolveStructureComponent( 998 const parser::StructureComponent &); 999 const parser::Name *ResolveDataRef(const parser::DataRef &); 1000 const parser::Name *ResolveName(const parser::Name &); 1001 bool PassesSharedLocalityChecks(const parser::Name &name, Symbol &symbol); 1002 Symbol *NoteInterfaceName(const parser::Name &); 1003 bool IsUplevelReference(const Symbol &); 1004 1005 std::optional<SourceName> BeginCheckOnIndexUseInOwnBounds( 1006 const parser::DoVariable &name) { 1007 std::optional<SourceName> result{checkIndexUseInOwnBounds_}; 1008 checkIndexUseInOwnBounds_ = name.thing.thing.source; 1009 return result; 1010 } 1011 void EndCheckOnIndexUseInOwnBounds(const std::optional<SourceName> &restore) { 1012 checkIndexUseInOwnBounds_ = restore; 1013 } 1014 1015 private: 1016 // The attribute corresponding to the statement containing an ObjectDecl 1017 std::optional<Attr> objectDeclAttr_; 1018 // Info about current character type while walking DeclTypeSpec. 1019 // Also captures any "*length" specifier on an individual declaration. 1020 struct { 1021 std::optional<ParamValue> length; 1022 std::optional<KindExpr> kind; 1023 } charInfo_; 1024 // Info about current derived type or STRUCTURE while walking 1025 // DerivedTypeDef / StructureDef 1026 struct { 1027 const parser::Name *extends{nullptr}; // EXTENDS(name) 1028 bool privateComps{false}; // components are private by default 1029 bool privateBindings{false}; // bindings are private by default 1030 bool sawContains{false}; // currently processing bindings 1031 bool sequence{false}; // is a sequence type 1032 const Symbol *type{nullptr}; // derived type being defined 1033 bool isStructure{false}; // is a DEC STRUCTURE 1034 } derivedTypeInfo_; 1035 // In a ProcedureDeclarationStmt or ProcComponentDefStmt, this is 1036 // the interface name, if any. 1037 const parser::Name *interfaceName_{nullptr}; 1038 // Map type-bound generic to binding names of its specific bindings 1039 std::multimap<Symbol *, const parser::Name *> genericBindings_; 1040 // Info about current ENUM 1041 struct EnumeratorState { 1042 // Enum value must hold inside a C_INT (7.6.2). 1043 std::optional<int> value{0}; 1044 } enumerationState_; 1045 // Set for OldParameterStmt processing 1046 bool inOldStyleParameterStmt_{false}; 1047 // Set when walking DATA & array constructor implied DO loop bounds 1048 // to warn about use of the implied DO intex therein. 1049 std::optional<SourceName> checkIndexUseInOwnBounds_; 1050 1051 bool HandleAttributeStmt(Attr, const std::list<parser::Name> &); 1052 Symbol &HandleAttributeStmt(Attr, const parser::Name &); 1053 Symbol &DeclareUnknownEntity(const parser::Name &, Attrs); 1054 Symbol &DeclareProcEntity(const parser::Name &, Attrs, const ProcInterface &); 1055 void SetType(const parser::Name &, const DeclTypeSpec &); 1056 std::optional<DerivedTypeSpec> ResolveDerivedType(const parser::Name &); 1057 std::optional<DerivedTypeSpec> ResolveExtendsType( 1058 const parser::Name &, const parser::Name *); 1059 Symbol *MakeTypeSymbol(const SourceName &, Details &&); 1060 Symbol *MakeTypeSymbol(const parser::Name &, Details &&); 1061 bool OkToAddComponent(const parser::Name &, const Symbol * = nullptr); 1062 ParamValue GetParamValue( 1063 const parser::TypeParamValue &, common::TypeParamAttr attr); 1064 void CheckCommonBlockDerivedType(const SourceName &, const Symbol &); 1065 std::optional<MessageFixedText> CheckSaveAttr(const Symbol &); 1066 Attrs HandleSaveName(const SourceName &, Attrs); 1067 void AddSaveName(std::set<SourceName> &, const SourceName &); 1068 void SetSaveAttr(Symbol &); 1069 bool HandleUnrestrictedSpecificIntrinsicFunction(const parser::Name &); 1070 const parser::Name *FindComponent(const parser::Name *, const parser::Name &); 1071 void Initialization(const parser::Name &, const parser::Initialization &, 1072 bool inComponentDecl); 1073 bool PassesLocalityChecks(const parser::Name &name, Symbol &symbol); 1074 bool CheckForHostAssociatedImplicit(const parser::Name &); 1075 1076 // Declare an object or procedure entity. 1077 // T is one of: EntityDetails, ObjectEntityDetails, ProcEntityDetails 1078 template <typename T> 1079 Symbol &DeclareEntity(const parser::Name &name, Attrs attrs) { 1080 Symbol &symbol{MakeSymbol(name, attrs)}; 1081 if (context().HasError(symbol) || symbol.has<T>()) { 1082 return symbol; // OK or error already reported 1083 } else if (symbol.has<UnknownDetails>()) { 1084 symbol.set_details(T{}); 1085 return symbol; 1086 } else if (auto *details{symbol.detailsIf<EntityDetails>()}) { 1087 symbol.set_details(T{std::move(*details)}); 1088 return symbol; 1089 } else if (std::is_same_v<EntityDetails, T> && 1090 (symbol.has<ObjectEntityDetails>() || 1091 symbol.has<ProcEntityDetails>())) { 1092 return symbol; // OK 1093 } else if (auto *details{symbol.detailsIf<UseDetails>()}) { 1094 Say(name.source, 1095 "'%s' is use-associated from module '%s' and cannot be re-declared"_err_en_US, 1096 name.source, GetUsedModule(*details).name()); 1097 } else if (auto *details{symbol.detailsIf<SubprogramNameDetails>()}) { 1098 if (details->kind() == SubprogramKind::Module) { 1099 Say2(name, 1100 "Declaration of '%s' conflicts with its use as module procedure"_err_en_US, 1101 symbol, "Module procedure definition"_en_US); 1102 } else if (details->kind() == SubprogramKind::Internal) { 1103 Say2(name, 1104 "Declaration of '%s' conflicts with its use as internal procedure"_err_en_US, 1105 symbol, "Internal procedure definition"_en_US); 1106 } else { 1107 DIE("unexpected kind"); 1108 } 1109 } else if (std::is_same_v<ObjectEntityDetails, T> && 1110 symbol.has<ProcEntityDetails>()) { 1111 SayWithDecl( 1112 name, symbol, "'%s' is already declared as a procedure"_err_en_US); 1113 } else if (std::is_same_v<ProcEntityDetails, T> && 1114 symbol.has<ObjectEntityDetails>()) { 1115 if (InCommonBlock(symbol)) { 1116 SayWithDecl(name, symbol, 1117 "'%s' may not be a procedure as it is in a COMMON block"_err_en_US); 1118 } else { 1119 SayWithDecl( 1120 name, symbol, "'%s' is already declared as an object"_err_en_US); 1121 } 1122 } else if (!CheckPossibleBadForwardRef(symbol)) { 1123 SayAlreadyDeclared(name, symbol); 1124 } 1125 context().SetError(symbol); 1126 return symbol; 1127 } 1128 bool HasCycle(const Symbol &, const ProcInterface &); 1129 }; 1130 1131 // Resolve construct entities and statement entities. 1132 // Check that construct names don't conflict with other names. 1133 class ConstructVisitor : public virtual DeclarationVisitor { 1134 public: 1135 bool Pre(const parser::ConcurrentHeader &); 1136 bool Pre(const parser::LocalitySpec::Local &); 1137 bool Pre(const parser::LocalitySpec::LocalInit &); 1138 bool Pre(const parser::LocalitySpec::Shared &); 1139 bool Pre(const parser::AcSpec &); 1140 bool Pre(const parser::AcImpliedDo &); 1141 bool Pre(const parser::DataImpliedDo &); 1142 bool Pre(const parser::DataIDoObject &); 1143 bool Pre(const parser::DataStmtObject &); 1144 bool Pre(const parser::DataStmtValue &); 1145 bool Pre(const parser::DoConstruct &); 1146 void Post(const parser::DoConstruct &); 1147 bool Pre(const parser::ForallConstruct &); 1148 void Post(const parser::ForallConstruct &); 1149 bool Pre(const parser::ForallStmt &); 1150 void Post(const parser::ForallStmt &); 1151 bool Pre(const parser::BlockStmt &); 1152 bool Pre(const parser::EndBlockStmt &); 1153 void Post(const parser::Selector &); 1154 void Post(const parser::AssociateStmt &); 1155 void Post(const parser::EndAssociateStmt &); 1156 bool Pre(const parser::Association &); 1157 void Post(const parser::SelectTypeStmt &); 1158 void Post(const parser::SelectRankStmt &); 1159 bool Pre(const parser::SelectTypeConstruct &); 1160 void Post(const parser::SelectTypeConstruct &); 1161 bool Pre(const parser::SelectTypeConstruct::TypeCase &); 1162 void Post(const parser::SelectTypeConstruct::TypeCase &); 1163 // Creates Block scopes with neither symbol name nor symbol details. 1164 bool Pre(const parser::SelectRankConstruct::RankCase &); 1165 void Post(const parser::SelectRankConstruct::RankCase &); 1166 void Post(const parser::TypeGuardStmt::Guard &); 1167 void Post(const parser::SelectRankCaseStmt::Rank &); 1168 bool Pre(const parser::ChangeTeamStmt &); 1169 void Post(const parser::EndChangeTeamStmt &); 1170 void Post(const parser::CoarrayAssociation &); 1171 1172 // Definitions of construct names 1173 bool Pre(const parser::WhereConstructStmt &x) { return CheckDef(x.t); } 1174 bool Pre(const parser::ForallConstructStmt &x) { return CheckDef(x.t); } 1175 bool Pre(const parser::CriticalStmt &x) { return CheckDef(x.t); } 1176 bool Pre(const parser::LabelDoStmt &) { 1177 return false; // error recovery 1178 } 1179 bool Pre(const parser::NonLabelDoStmt &x) { return CheckDef(x.t); } 1180 bool Pre(const parser::IfThenStmt &x) { return CheckDef(x.t); } 1181 bool Pre(const parser::SelectCaseStmt &x) { return CheckDef(x.t); } 1182 bool Pre(const parser::SelectRankConstruct &); 1183 void Post(const parser::SelectRankConstruct &); 1184 bool Pre(const parser::SelectRankStmt &x) { 1185 return CheckDef(std::get<0>(x.t)); 1186 } 1187 bool Pre(const parser::SelectTypeStmt &x) { 1188 return CheckDef(std::get<0>(x.t)); 1189 } 1190 1191 // References to construct names 1192 void Post(const parser::MaskedElsewhereStmt &x) { CheckRef(x.t); } 1193 void Post(const parser::ElsewhereStmt &x) { CheckRef(x.v); } 1194 void Post(const parser::EndWhereStmt &x) { CheckRef(x.v); } 1195 void Post(const parser::EndForallStmt &x) { CheckRef(x.v); } 1196 void Post(const parser::EndCriticalStmt &x) { CheckRef(x.v); } 1197 void Post(const parser::EndDoStmt &x) { CheckRef(x.v); } 1198 void Post(const parser::ElseIfStmt &x) { CheckRef(x.t); } 1199 void Post(const parser::ElseStmt &x) { CheckRef(x.v); } 1200 void Post(const parser::EndIfStmt &x) { CheckRef(x.v); } 1201 void Post(const parser::CaseStmt &x) { CheckRef(x.t); } 1202 void Post(const parser::EndSelectStmt &x) { CheckRef(x.v); } 1203 void Post(const parser::SelectRankCaseStmt &x) { CheckRef(x.t); } 1204 void Post(const parser::TypeGuardStmt &x) { CheckRef(x.t); } 1205 void Post(const parser::CycleStmt &x) { CheckRef(x.v); } 1206 void Post(const parser::ExitStmt &x) { CheckRef(x.v); } 1207 1208 private: 1209 // R1105 selector -> expr | variable 1210 // expr is set in either case unless there were errors 1211 struct Selector { 1212 Selector() {} 1213 Selector(const SourceName &source, MaybeExpr &&expr) 1214 : source{source}, expr{std::move(expr)} {} 1215 operator bool() const { return expr.has_value(); } 1216 parser::CharBlock source; 1217 MaybeExpr expr; 1218 }; 1219 // association -> [associate-name =>] selector 1220 struct Association { 1221 const parser::Name *name{nullptr}; 1222 Selector selector; 1223 }; 1224 std::vector<Association> associationStack_; 1225 Association *currentAssociation_{nullptr}; 1226 1227 template <typename T> bool CheckDef(const T &t) { 1228 return CheckDef(std::get<std::optional<parser::Name>>(t)); 1229 } 1230 template <typename T> void CheckRef(const T &t) { 1231 CheckRef(std::get<std::optional<parser::Name>>(t)); 1232 } 1233 bool CheckDef(const std::optional<parser::Name> &); 1234 void CheckRef(const std::optional<parser::Name> &); 1235 const DeclTypeSpec &ToDeclTypeSpec(evaluate::DynamicType &&); 1236 const DeclTypeSpec &ToDeclTypeSpec( 1237 evaluate::DynamicType &&, MaybeSubscriptIntExpr &&length); 1238 Symbol *MakeAssocEntity(); 1239 void SetTypeFromAssociation(Symbol &); 1240 void SetAttrsFromAssociation(Symbol &); 1241 Selector ResolveSelector(const parser::Selector &); 1242 void ResolveIndexName(const parser::ConcurrentControl &control); 1243 void SetCurrentAssociation(std::size_t n); 1244 Association &GetCurrentAssociation(); 1245 void PushAssociation(); 1246 void PopAssociation(std::size_t count = 1); 1247 }; 1248 1249 // Create scopes for OpenACC constructs 1250 class AccVisitor : public virtual DeclarationVisitor { 1251 public: 1252 void AddAccSourceRange(const parser::CharBlock &); 1253 1254 static bool NeedsScope(const parser::OpenACCBlockConstruct &); 1255 1256 bool Pre(const parser::OpenACCBlockConstruct &); 1257 void Post(const parser::OpenACCBlockConstruct &); 1258 bool Pre(const parser::AccBeginBlockDirective &x) { 1259 AddAccSourceRange(x.source); 1260 return true; 1261 } 1262 void Post(const parser::AccBeginBlockDirective &) { 1263 messageHandler().set_currStmtSource(std::nullopt); 1264 } 1265 bool Pre(const parser::AccEndBlockDirective &x) { 1266 AddAccSourceRange(x.source); 1267 return true; 1268 } 1269 void Post(const parser::AccEndBlockDirective &) { 1270 messageHandler().set_currStmtSource(std::nullopt); 1271 } 1272 bool Pre(const parser::AccBeginLoopDirective &x) { 1273 AddAccSourceRange(x.source); 1274 return true; 1275 } 1276 void Post(const parser::AccBeginLoopDirective &x) { 1277 messageHandler().set_currStmtSource(std::nullopt); 1278 } 1279 }; 1280 1281 bool AccVisitor::NeedsScope(const parser::OpenACCBlockConstruct &x) { 1282 const auto &beginBlockDir{std::get<parser::AccBeginBlockDirective>(x.t)}; 1283 const auto &beginDir{std::get<parser::AccBlockDirective>(beginBlockDir.t)}; 1284 switch (beginDir.v) { 1285 case llvm::acc::Directive::ACCD_data: 1286 case llvm::acc::Directive::ACCD_host_data: 1287 case llvm::acc::Directive::ACCD_kernels: 1288 case llvm::acc::Directive::ACCD_parallel: 1289 case llvm::acc::Directive::ACCD_serial: 1290 return true; 1291 default: 1292 return false; 1293 } 1294 } 1295 1296 void AccVisitor::AddAccSourceRange(const parser::CharBlock &source) { 1297 messageHandler().set_currStmtSource(source); 1298 currScope().AddSourceRange(source); 1299 } 1300 1301 bool AccVisitor::Pre(const parser::OpenACCBlockConstruct &x) { 1302 if (NeedsScope(x)) { 1303 PushScope(Scope::Kind::Block, nullptr); 1304 } 1305 return true; 1306 } 1307 1308 void AccVisitor::Post(const parser::OpenACCBlockConstruct &x) { 1309 if (NeedsScope(x)) { 1310 PopScope(); 1311 } 1312 } 1313 1314 // Create scopes for OpenMP constructs 1315 class OmpVisitor : public virtual DeclarationVisitor { 1316 public: 1317 void AddOmpSourceRange(const parser::CharBlock &); 1318 1319 static bool NeedsScope(const parser::OpenMPBlockConstruct &); 1320 1321 bool Pre(const parser::OpenMPBlockConstruct &); 1322 void Post(const parser::OpenMPBlockConstruct &); 1323 bool Pre(const parser::OmpBeginBlockDirective &x) { 1324 AddOmpSourceRange(x.source); 1325 return true; 1326 } 1327 void Post(const parser::OmpBeginBlockDirective &) { 1328 messageHandler().set_currStmtSource(std::nullopt); 1329 } 1330 bool Pre(const parser::OmpEndBlockDirective &x) { 1331 AddOmpSourceRange(x.source); 1332 return true; 1333 } 1334 void Post(const parser::OmpEndBlockDirective &) { 1335 messageHandler().set_currStmtSource(std::nullopt); 1336 } 1337 1338 bool Pre(const parser::OpenMPLoopConstruct &) { 1339 PushScope(Scope::Kind::Block, nullptr); 1340 return true; 1341 } 1342 void Post(const parser::OpenMPLoopConstruct &) { PopScope(); } 1343 bool Pre(const parser::OmpBeginLoopDirective &x) { 1344 AddOmpSourceRange(x.source); 1345 return true; 1346 } 1347 void Post(const parser::OmpBeginLoopDirective &) { 1348 messageHandler().set_currStmtSource(std::nullopt); 1349 } 1350 bool Pre(const parser::OmpEndLoopDirective &x) { 1351 AddOmpSourceRange(x.source); 1352 return true; 1353 } 1354 void Post(const parser::OmpEndLoopDirective &) { 1355 messageHandler().set_currStmtSource(std::nullopt); 1356 } 1357 1358 bool Pre(const parser::OpenMPSectionsConstruct &) { 1359 PushScope(Scope::Kind::Block, nullptr); 1360 return true; 1361 } 1362 void Post(const parser::OpenMPSectionsConstruct &) { PopScope(); } 1363 bool Pre(const parser::OmpBeginSectionsDirective &x) { 1364 AddOmpSourceRange(x.source); 1365 return true; 1366 } 1367 void Post(const parser::OmpBeginSectionsDirective &) { 1368 messageHandler().set_currStmtSource(std::nullopt); 1369 } 1370 bool Pre(const parser::OmpEndSectionsDirective &x) { 1371 AddOmpSourceRange(x.source); 1372 return true; 1373 } 1374 void Post(const parser::OmpEndSectionsDirective &) { 1375 messageHandler().set_currStmtSource(std::nullopt); 1376 } 1377 }; 1378 1379 bool OmpVisitor::NeedsScope(const parser::OpenMPBlockConstruct &x) { 1380 const auto &beginBlockDir{std::get<parser::OmpBeginBlockDirective>(x.t)}; 1381 const auto &beginDir{std::get<parser::OmpBlockDirective>(beginBlockDir.t)}; 1382 switch (beginDir.v) { 1383 case llvm::omp::Directive::OMPD_target_data: 1384 case llvm::omp::Directive::OMPD_master: 1385 case llvm::omp::Directive::OMPD_ordered: 1386 case llvm::omp::Directive::OMPD_taskgroup: 1387 return false; 1388 default: 1389 return true; 1390 } 1391 } 1392 1393 void OmpVisitor::AddOmpSourceRange(const parser::CharBlock &source) { 1394 messageHandler().set_currStmtSource(source); 1395 currScope().AddSourceRange(source); 1396 } 1397 1398 bool OmpVisitor::Pre(const parser::OpenMPBlockConstruct &x) { 1399 if (NeedsScope(x)) { 1400 PushScope(Scope::Kind::Block, nullptr); 1401 } 1402 return true; 1403 } 1404 1405 void OmpVisitor::Post(const parser::OpenMPBlockConstruct &x) { 1406 if (NeedsScope(x)) { 1407 PopScope(); 1408 } 1409 } 1410 1411 // Walk the parse tree and resolve names to symbols. 1412 class ResolveNamesVisitor : public virtual ScopeHandler, 1413 public ModuleVisitor, 1414 public SubprogramVisitor, 1415 public ConstructVisitor, 1416 public OmpVisitor, 1417 public AccVisitor { 1418 public: 1419 using AccVisitor::Post; 1420 using AccVisitor::Pre; 1421 using ArraySpecVisitor::Post; 1422 using ConstructVisitor::Post; 1423 using ConstructVisitor::Pre; 1424 using DeclarationVisitor::Post; 1425 using DeclarationVisitor::Pre; 1426 using ImplicitRulesVisitor::Post; 1427 using ImplicitRulesVisitor::Pre; 1428 using InterfaceVisitor::Post; 1429 using InterfaceVisitor::Pre; 1430 using ModuleVisitor::Post; 1431 using ModuleVisitor::Pre; 1432 using OmpVisitor::Post; 1433 using OmpVisitor::Pre; 1434 using ScopeHandler::Post; 1435 using ScopeHandler::Pre; 1436 using SubprogramVisitor::Post; 1437 using SubprogramVisitor::Pre; 1438 1439 ResolveNamesVisitor( 1440 SemanticsContext &context, ImplicitRulesMap &rules, Scope &top) 1441 : BaseVisitor{context, *this, rules}, topScope_{top} { 1442 PushScope(top); 1443 } 1444 1445 Scope &topScope() const { return topScope_; } 1446 1447 // Default action for a parse tree node is to visit children. 1448 template <typename T> bool Pre(const T &) { return true; } 1449 template <typename T> void Post(const T &) {} 1450 1451 bool Pre(const parser::SpecificationPart &); 1452 void Post(const parser::Program &); 1453 bool Pre(const parser::ImplicitStmt &); 1454 void Post(const parser::PointerObject &); 1455 void Post(const parser::AllocateObject &); 1456 bool Pre(const parser::PointerAssignmentStmt &); 1457 void Post(const parser::Designator &); 1458 template <typename A, typename B> 1459 void Post(const parser::LoopBounds<A, B> &x) { 1460 ResolveName(*parser::Unwrap<parser::Name>(x.name)); 1461 } 1462 void Post(const parser::ProcComponentRef &); 1463 bool Pre(const parser::FunctionReference &); 1464 bool Pre(const parser::CallStmt &); 1465 bool Pre(const parser::ImportStmt &); 1466 void Post(const parser::TypeGuardStmt &); 1467 bool Pre(const parser::StmtFunctionStmt &); 1468 bool Pre(const parser::DefinedOpName &); 1469 bool Pre(const parser::ProgramUnit &); 1470 void Post(const parser::AssignStmt &); 1471 void Post(const parser::AssignedGotoStmt &); 1472 1473 // These nodes should never be reached: they are handled in ProgramUnit 1474 bool Pre(const parser::MainProgram &) { 1475 llvm_unreachable("This node is handled in ProgramUnit"); 1476 } 1477 bool Pre(const parser::FunctionSubprogram &) { 1478 llvm_unreachable("This node is handled in ProgramUnit"); 1479 } 1480 bool Pre(const parser::SubroutineSubprogram &) { 1481 llvm_unreachable("This node is handled in ProgramUnit"); 1482 } 1483 bool Pre(const parser::SeparateModuleSubprogram &) { 1484 llvm_unreachable("This node is handled in ProgramUnit"); 1485 } 1486 bool Pre(const parser::Module &) { 1487 llvm_unreachable("This node is handled in ProgramUnit"); 1488 } 1489 bool Pre(const parser::Submodule &) { 1490 llvm_unreachable("This node is handled in ProgramUnit"); 1491 } 1492 bool Pre(const parser::BlockData &) { 1493 llvm_unreachable("This node is handled in ProgramUnit"); 1494 } 1495 1496 void NoteExecutablePartCall(Symbol::Flag, const parser::Call &); 1497 1498 friend void ResolveSpecificationParts(SemanticsContext &, const Symbol &); 1499 1500 private: 1501 // Kind of procedure we are expecting to see in a ProcedureDesignator 1502 std::optional<Symbol::Flag> expectedProcFlag_; 1503 std::optional<SourceName> prevImportStmt_; 1504 Scope &topScope_; 1505 1506 void PreSpecificationConstruct(const parser::SpecificationConstruct &); 1507 void CreateCommonBlockSymbols(const parser::CommonStmt &); 1508 void CreateGeneric(const parser::GenericSpec &); 1509 void FinishSpecificationPart(const std::list<parser::DeclarationConstruct> &); 1510 void AnalyzeStmtFunctionStmt(const parser::StmtFunctionStmt &); 1511 void CheckImports(); 1512 void CheckImport(const SourceName &, const SourceName &); 1513 void HandleCall(Symbol::Flag, const parser::Call &); 1514 void HandleProcedureName(Symbol::Flag, const parser::Name &); 1515 bool CheckImplicitNoneExternal(const SourceName &, const Symbol &); 1516 bool SetProcFlag(const parser::Name &, Symbol &, Symbol::Flag); 1517 void ResolveSpecificationParts(ProgramTree &); 1518 void AddSubpNames(ProgramTree &); 1519 bool BeginScopeForNode(const ProgramTree &); 1520 void EndScopeForNode(const ProgramTree &); 1521 void FinishSpecificationParts(const ProgramTree &); 1522 void FinishDerivedTypeInstantiation(Scope &); 1523 void ResolveExecutionParts(const ProgramTree &); 1524 }; 1525 1526 // ImplicitRules implementation 1527 1528 bool ImplicitRules::isImplicitNoneType() const { 1529 if (isImplicitNoneType_) { 1530 return true; 1531 } else if (map_.empty() && inheritFromParent_) { 1532 return parent_->isImplicitNoneType(); 1533 } else { 1534 return false; // default if not specified 1535 } 1536 } 1537 1538 bool ImplicitRules::isImplicitNoneExternal() const { 1539 if (isImplicitNoneExternal_) { 1540 return true; 1541 } else if (inheritFromParent_) { 1542 return parent_->isImplicitNoneExternal(); 1543 } else { 1544 return false; // default if not specified 1545 } 1546 } 1547 1548 const DeclTypeSpec *ImplicitRules::GetType( 1549 SourceName name, bool respectImplicitNoneType) const { 1550 char ch{name.begin()[0]}; 1551 if (isImplicitNoneType_ && respectImplicitNoneType) { 1552 return nullptr; 1553 } else if (auto it{map_.find(ch)}; it != map_.end()) { 1554 return &*it->second; 1555 } else if (inheritFromParent_) { 1556 return parent_->GetType(name, respectImplicitNoneType); 1557 } else if (ch >= 'i' && ch <= 'n') { 1558 return &context_.MakeNumericType(TypeCategory::Integer); 1559 } else if (ch >= 'a' && ch <= 'z') { 1560 return &context_.MakeNumericType(TypeCategory::Real); 1561 } else { 1562 return nullptr; 1563 } 1564 } 1565 1566 void ImplicitRules::SetTypeMapping(const DeclTypeSpec &type, 1567 parser::Location fromLetter, parser::Location toLetter) { 1568 for (char ch = *fromLetter; ch; ch = ImplicitRules::Incr(ch)) { 1569 auto res{map_.emplace(ch, type)}; 1570 if (!res.second) { 1571 context_.Say(parser::CharBlock{fromLetter}, 1572 "More than one implicit type specified for '%c'"_err_en_US, ch); 1573 } 1574 if (ch == *toLetter) { 1575 break; 1576 } 1577 } 1578 } 1579 1580 // Return the next char after ch in a way that works for ASCII or EBCDIC. 1581 // Return '\0' for the char after 'z'. 1582 char ImplicitRules::Incr(char ch) { 1583 switch (ch) { 1584 case 'i': 1585 return 'j'; 1586 case 'r': 1587 return 's'; 1588 case 'z': 1589 return '\0'; 1590 default: 1591 return ch + 1; 1592 } 1593 } 1594 1595 llvm::raw_ostream &operator<<( 1596 llvm::raw_ostream &o, const ImplicitRules &implicitRules) { 1597 o << "ImplicitRules:\n"; 1598 for (char ch = 'a'; ch; ch = ImplicitRules::Incr(ch)) { 1599 ShowImplicitRule(o, implicitRules, ch); 1600 } 1601 ShowImplicitRule(o, implicitRules, '_'); 1602 ShowImplicitRule(o, implicitRules, '$'); 1603 ShowImplicitRule(o, implicitRules, '@'); 1604 return o; 1605 } 1606 void ShowImplicitRule( 1607 llvm::raw_ostream &o, const ImplicitRules &implicitRules, char ch) { 1608 auto it{implicitRules.map_.find(ch)}; 1609 if (it != implicitRules.map_.end()) { 1610 o << " " << ch << ": " << *it->second << '\n'; 1611 } 1612 } 1613 1614 template <typename T> void BaseVisitor::Walk(const T &x) { 1615 parser::Walk(x, *this_); 1616 } 1617 1618 void BaseVisitor::MakePlaceholder( 1619 const parser::Name &name, MiscDetails::Kind kind) { 1620 if (!name.symbol) { 1621 name.symbol = &context_->globalScope().MakeSymbol( 1622 name.source, Attrs{}, MiscDetails{kind}); 1623 } 1624 } 1625 1626 // AttrsVisitor implementation 1627 1628 bool AttrsVisitor::BeginAttrs() { 1629 CHECK(!attrs_); 1630 attrs_ = std::make_optional<Attrs>(); 1631 return true; 1632 } 1633 Attrs AttrsVisitor::GetAttrs() { 1634 CHECK(attrs_); 1635 return *attrs_; 1636 } 1637 Attrs AttrsVisitor::EndAttrs() { 1638 Attrs result{GetAttrs()}; 1639 attrs_.reset(); 1640 passName_ = std::nullopt; 1641 bindName_.reset(); 1642 return result; 1643 } 1644 1645 bool AttrsVisitor::SetPassNameOn(Symbol &symbol) { 1646 if (!passName_) { 1647 return false; 1648 } 1649 common::visit(common::visitors{ 1650 [&](ProcEntityDetails &x) { x.set_passName(*passName_); }, 1651 [&](ProcBindingDetails &x) { x.set_passName(*passName_); }, 1652 [](auto &) { common::die("unexpected pass name"); }, 1653 }, 1654 symbol.details()); 1655 return true; 1656 } 1657 1658 void AttrsVisitor::SetBindNameOn(Symbol &symbol) { 1659 if (!attrs_ || !attrs_->test(Attr::BIND_C)) { 1660 return; 1661 } 1662 std::optional<std::string> label{ 1663 evaluate::GetScalarConstantValue<evaluate::Ascii>(bindName_)}; 1664 // 18.9.2(2): discard leading and trailing blanks, ignore if all blank 1665 if (label) { 1666 auto first{label->find_first_not_of(" ")}; 1667 if (first == std::string::npos) { 1668 // Empty NAME= means no binding at all (18.10.2p2) 1669 Say(currStmtSource().value(), "Blank binding label ignored"_warn_en_US); 1670 return; 1671 } 1672 auto last{label->find_last_not_of(" ")}; 1673 label = label->substr(first, last - first + 1); 1674 } else { 1675 label = parser::ToLowerCaseLetters(symbol.name().ToString()); 1676 } 1677 symbol.SetBindName(std::move(*label)); 1678 } 1679 1680 void AttrsVisitor::Post(const parser::LanguageBindingSpec &x) { 1681 CHECK(attrs_); 1682 if (CheckAndSet(Attr::BIND_C)) { 1683 if (x.v) { 1684 bindName_ = EvaluateExpr(*x.v); 1685 } 1686 } 1687 } 1688 bool AttrsVisitor::Pre(const parser::IntentSpec &x) { 1689 CHECK(attrs_); 1690 CheckAndSet(IntentSpecToAttr(x)); 1691 return false; 1692 } 1693 bool AttrsVisitor::Pre(const parser::Pass &x) { 1694 if (CheckAndSet(Attr::PASS)) { 1695 if (x.v) { 1696 passName_ = x.v->source; 1697 MakePlaceholder(*x.v, MiscDetails::Kind::PassName); 1698 } 1699 } 1700 return false; 1701 } 1702 1703 // C730, C743, C755, C778, C1543 say no attribute or prefix repetitions 1704 bool AttrsVisitor::IsDuplicateAttr(Attr attrName) { 1705 if (attrs_->test(attrName)) { 1706 Say(currStmtSource().value(), 1707 "Attribute '%s' cannot be used more than once"_warn_en_US, 1708 AttrToString(attrName)); 1709 return true; 1710 } 1711 return false; 1712 } 1713 1714 // See if attrName violates a constraint cause by a conflict. attr1 and attr2 1715 // name attributes that cannot be used on the same declaration 1716 bool AttrsVisitor::HaveAttrConflict(Attr attrName, Attr attr1, Attr attr2) { 1717 if ((attrName == attr1 && attrs_->test(attr2)) || 1718 (attrName == attr2 && attrs_->test(attr1))) { 1719 Say(currStmtSource().value(), 1720 "Attributes '%s' and '%s' conflict with each other"_err_en_US, 1721 AttrToString(attr1), AttrToString(attr2)); 1722 return true; 1723 } 1724 return false; 1725 } 1726 // C759, C1543 1727 bool AttrsVisitor::IsConflictingAttr(Attr attrName) { 1728 return HaveAttrConflict(attrName, Attr::INTENT_IN, Attr::INTENT_INOUT) || 1729 HaveAttrConflict(attrName, Attr::INTENT_IN, Attr::INTENT_OUT) || 1730 HaveAttrConflict(attrName, Attr::INTENT_INOUT, Attr::INTENT_OUT) || 1731 HaveAttrConflict(attrName, Attr::PASS, Attr::NOPASS) || // C781 1732 HaveAttrConflict(attrName, Attr::PURE, Attr::IMPURE) || 1733 HaveAttrConflict(attrName, Attr::PUBLIC, Attr::PRIVATE) || 1734 HaveAttrConflict(attrName, Attr::RECURSIVE, Attr::NON_RECURSIVE); 1735 } 1736 bool AttrsVisitor::CheckAndSet(Attr attrName) { 1737 CHECK(attrs_); 1738 if (IsConflictingAttr(attrName) || IsDuplicateAttr(attrName)) { 1739 return false; 1740 } 1741 attrs_->set(attrName); 1742 return true; 1743 } 1744 1745 // DeclTypeSpecVisitor implementation 1746 1747 const DeclTypeSpec *DeclTypeSpecVisitor::GetDeclTypeSpec() { 1748 return state_.declTypeSpec; 1749 } 1750 1751 void DeclTypeSpecVisitor::BeginDeclTypeSpec() { 1752 CHECK(!state_.expectDeclTypeSpec); 1753 CHECK(!state_.declTypeSpec); 1754 state_.expectDeclTypeSpec = true; 1755 } 1756 void DeclTypeSpecVisitor::EndDeclTypeSpec() { 1757 CHECK(state_.expectDeclTypeSpec); 1758 state_ = {}; 1759 } 1760 1761 void DeclTypeSpecVisitor::SetDeclTypeSpecCategory( 1762 DeclTypeSpec::Category category) { 1763 CHECK(state_.expectDeclTypeSpec); 1764 state_.derived.category = category; 1765 } 1766 1767 bool DeclTypeSpecVisitor::Pre(const parser::TypeGuardStmt &) { 1768 BeginDeclTypeSpec(); 1769 return true; 1770 } 1771 void DeclTypeSpecVisitor::Post(const parser::TypeGuardStmt &) { 1772 EndDeclTypeSpec(); 1773 } 1774 1775 void DeclTypeSpecVisitor::Post(const parser::TypeSpec &typeSpec) { 1776 // Record the resolved DeclTypeSpec in the parse tree for use by 1777 // expression semantics if the DeclTypeSpec is a valid TypeSpec. 1778 // The grammar ensures that it's an intrinsic or derived type spec, 1779 // not TYPE(*) or CLASS(*) or CLASS(T). 1780 if (const DeclTypeSpec * spec{state_.declTypeSpec}) { 1781 switch (spec->category()) { 1782 case DeclTypeSpec::Numeric: 1783 case DeclTypeSpec::Logical: 1784 case DeclTypeSpec::Character: 1785 typeSpec.declTypeSpec = spec; 1786 break; 1787 case DeclTypeSpec::TypeDerived: 1788 if (const DerivedTypeSpec * derived{spec->AsDerived()}) { 1789 CheckForAbstractType(derived->typeSymbol()); // C703 1790 typeSpec.declTypeSpec = spec; 1791 } 1792 break; 1793 default: 1794 CRASH_NO_CASE; 1795 } 1796 } 1797 } 1798 1799 void DeclTypeSpecVisitor::Post( 1800 const parser::IntrinsicTypeSpec::DoublePrecision &) { 1801 MakeNumericType(TypeCategory::Real, context().doublePrecisionKind()); 1802 } 1803 void DeclTypeSpecVisitor::Post( 1804 const parser::IntrinsicTypeSpec::DoubleComplex &) { 1805 MakeNumericType(TypeCategory::Complex, context().doublePrecisionKind()); 1806 } 1807 void DeclTypeSpecVisitor::MakeNumericType(TypeCategory category, int kind) { 1808 SetDeclTypeSpec(context().MakeNumericType(category, kind)); 1809 } 1810 1811 void DeclTypeSpecVisitor::CheckForAbstractType(const Symbol &typeSymbol) { 1812 if (typeSymbol.attrs().test(Attr::ABSTRACT)) { 1813 Say("ABSTRACT derived type may not be used here"_err_en_US); 1814 } 1815 } 1816 1817 void DeclTypeSpecVisitor::Post(const parser::DeclarationTypeSpec::ClassStar &) { 1818 SetDeclTypeSpec(context().globalScope().MakeClassStarType()); 1819 } 1820 void DeclTypeSpecVisitor::Post(const parser::DeclarationTypeSpec::TypeStar &) { 1821 SetDeclTypeSpec(context().globalScope().MakeTypeStarType()); 1822 } 1823 1824 // Check that we're expecting to see a DeclTypeSpec (and haven't seen one yet) 1825 // and save it in state_.declTypeSpec. 1826 void DeclTypeSpecVisitor::SetDeclTypeSpec(const DeclTypeSpec &declTypeSpec) { 1827 CHECK(state_.expectDeclTypeSpec); 1828 CHECK(!state_.declTypeSpec); 1829 state_.declTypeSpec = &declTypeSpec; 1830 } 1831 1832 KindExpr DeclTypeSpecVisitor::GetKindParamExpr( 1833 TypeCategory category, const std::optional<parser::KindSelector> &kind) { 1834 return AnalyzeKindSelector(context(), category, kind); 1835 } 1836 1837 // MessageHandler implementation 1838 1839 Message &MessageHandler::Say(MessageFixedText &&msg) { 1840 return context_->Say(currStmtSource().value(), std::move(msg)); 1841 } 1842 Message &MessageHandler::Say(MessageFormattedText &&msg) { 1843 return context_->Say(currStmtSource().value(), std::move(msg)); 1844 } 1845 Message &MessageHandler::Say(const SourceName &name, MessageFixedText &&msg) { 1846 return Say(name, std::move(msg), name); 1847 } 1848 1849 // ImplicitRulesVisitor implementation 1850 1851 void ImplicitRulesVisitor::Post(const parser::ParameterStmt &) { 1852 prevParameterStmt_ = currStmtSource(); 1853 } 1854 1855 bool ImplicitRulesVisitor::Pre(const parser::ImplicitStmt &x) { 1856 bool result{ 1857 common::visit(common::visitors{ 1858 [&](const std::list<ImplicitNoneNameSpec> &y) { 1859 return HandleImplicitNone(y); 1860 }, 1861 [&](const std::list<parser::ImplicitSpec> &) { 1862 if (prevImplicitNoneType_) { 1863 Say("IMPLICIT statement after IMPLICIT NONE or " 1864 "IMPLICIT NONE(TYPE) statement"_err_en_US); 1865 return false; 1866 } 1867 implicitRules_->set_isImplicitNoneType(false); 1868 return true; 1869 }, 1870 }, 1871 x.u)}; 1872 prevImplicit_ = currStmtSource(); 1873 return result; 1874 } 1875 1876 bool ImplicitRulesVisitor::Pre(const parser::LetterSpec &x) { 1877 auto loLoc{std::get<parser::Location>(x.t)}; 1878 auto hiLoc{loLoc}; 1879 if (auto hiLocOpt{std::get<std::optional<parser::Location>>(x.t)}) { 1880 hiLoc = *hiLocOpt; 1881 if (*hiLoc < *loLoc) { 1882 Say(hiLoc, "'%s' does not follow '%s' alphabetically"_err_en_US, 1883 std::string(hiLoc, 1), std::string(loLoc, 1)); 1884 return false; 1885 } 1886 } 1887 implicitRules_->SetTypeMapping(*GetDeclTypeSpec(), loLoc, hiLoc); 1888 return false; 1889 } 1890 1891 bool ImplicitRulesVisitor::Pre(const parser::ImplicitSpec &) { 1892 BeginDeclTypeSpec(); 1893 set_allowForwardReferenceToDerivedType(true); 1894 return true; 1895 } 1896 1897 void ImplicitRulesVisitor::Post(const parser::ImplicitSpec &) { 1898 EndDeclTypeSpec(); 1899 } 1900 1901 void ImplicitRulesVisitor::SetScope(const Scope &scope) { 1902 implicitRules_ = &DEREF(implicitRulesMap_).at(&scope); 1903 prevImplicit_ = std::nullopt; 1904 prevImplicitNone_ = std::nullopt; 1905 prevImplicitNoneType_ = std::nullopt; 1906 prevParameterStmt_ = std::nullopt; 1907 } 1908 void ImplicitRulesVisitor::BeginScope(const Scope &scope) { 1909 // find or create implicit rules for this scope 1910 DEREF(implicitRulesMap_).try_emplace(&scope, context(), implicitRules_); 1911 SetScope(scope); 1912 } 1913 1914 // TODO: for all of these errors, reference previous statement too 1915 bool ImplicitRulesVisitor::HandleImplicitNone( 1916 const std::list<ImplicitNoneNameSpec> &nameSpecs) { 1917 if (prevImplicitNone_) { 1918 Say("More than one IMPLICIT NONE statement"_err_en_US); 1919 Say(*prevImplicitNone_, "Previous IMPLICIT NONE statement"_en_US); 1920 return false; 1921 } 1922 if (prevParameterStmt_) { 1923 Say("IMPLICIT NONE statement after PARAMETER statement"_err_en_US); 1924 return false; 1925 } 1926 prevImplicitNone_ = currStmtSource(); 1927 bool implicitNoneTypeNever{ 1928 context().IsEnabled(common::LanguageFeature::ImplicitNoneTypeNever)}; 1929 if (nameSpecs.empty()) { 1930 if (!implicitNoneTypeNever) { 1931 prevImplicitNoneType_ = currStmtSource(); 1932 implicitRules_->set_isImplicitNoneType(true); 1933 if (prevImplicit_) { 1934 Say("IMPLICIT NONE statement after IMPLICIT statement"_err_en_US); 1935 return false; 1936 } 1937 } 1938 } else { 1939 int sawType{0}; 1940 int sawExternal{0}; 1941 for (const auto noneSpec : nameSpecs) { 1942 switch (noneSpec) { 1943 case ImplicitNoneNameSpec::External: 1944 implicitRules_->set_isImplicitNoneExternal(true); 1945 ++sawExternal; 1946 break; 1947 case ImplicitNoneNameSpec::Type: 1948 if (!implicitNoneTypeNever) { 1949 prevImplicitNoneType_ = currStmtSource(); 1950 implicitRules_->set_isImplicitNoneType(true); 1951 if (prevImplicit_) { 1952 Say("IMPLICIT NONE(TYPE) after IMPLICIT statement"_err_en_US); 1953 return false; 1954 } 1955 ++sawType; 1956 } 1957 break; 1958 } 1959 } 1960 if (sawType > 1) { 1961 Say("TYPE specified more than once in IMPLICIT NONE statement"_err_en_US); 1962 return false; 1963 } 1964 if (sawExternal > 1) { 1965 Say("EXTERNAL specified more than once in IMPLICIT NONE statement"_err_en_US); 1966 return false; 1967 } 1968 } 1969 return true; 1970 } 1971 1972 // ArraySpecVisitor implementation 1973 1974 void ArraySpecVisitor::Post(const parser::ArraySpec &x) { 1975 CHECK(arraySpec_.empty()); 1976 arraySpec_ = AnalyzeArraySpec(context(), x); 1977 } 1978 void ArraySpecVisitor::Post(const parser::ComponentArraySpec &x) { 1979 CHECK(arraySpec_.empty()); 1980 arraySpec_ = AnalyzeArraySpec(context(), x); 1981 } 1982 void ArraySpecVisitor::Post(const parser::CoarraySpec &x) { 1983 CHECK(coarraySpec_.empty()); 1984 coarraySpec_ = AnalyzeCoarraySpec(context(), x); 1985 } 1986 1987 const ArraySpec &ArraySpecVisitor::arraySpec() { 1988 return !arraySpec_.empty() ? arraySpec_ : attrArraySpec_; 1989 } 1990 const ArraySpec &ArraySpecVisitor::coarraySpec() { 1991 return !coarraySpec_.empty() ? coarraySpec_ : attrCoarraySpec_; 1992 } 1993 void ArraySpecVisitor::BeginArraySpec() { 1994 CHECK(arraySpec_.empty()); 1995 CHECK(coarraySpec_.empty()); 1996 CHECK(attrArraySpec_.empty()); 1997 CHECK(attrCoarraySpec_.empty()); 1998 } 1999 void ArraySpecVisitor::EndArraySpec() { 2000 CHECK(arraySpec_.empty()); 2001 CHECK(coarraySpec_.empty()); 2002 attrArraySpec_.clear(); 2003 attrCoarraySpec_.clear(); 2004 } 2005 void ArraySpecVisitor::PostAttrSpec() { 2006 // Save dimension/codimension from attrs so we can process array/coarray-spec 2007 // on the entity-decl 2008 if (!arraySpec_.empty()) { 2009 if (attrArraySpec_.empty()) { 2010 attrArraySpec_ = arraySpec_; 2011 arraySpec_.clear(); 2012 } else { 2013 Say(currStmtSource().value(), 2014 "Attribute 'DIMENSION' cannot be used more than once"_err_en_US); 2015 } 2016 } 2017 if (!coarraySpec_.empty()) { 2018 if (attrCoarraySpec_.empty()) { 2019 attrCoarraySpec_ = coarraySpec_; 2020 coarraySpec_.clear(); 2021 } else { 2022 Say(currStmtSource().value(), 2023 "Attribute 'CODIMENSION' cannot be used more than once"_err_en_US); 2024 } 2025 } 2026 } 2027 2028 // FuncResultStack implementation 2029 2030 FuncResultStack::~FuncResultStack() { CHECK(stack_.empty()); } 2031 2032 void FuncResultStack::CompleteFunctionResultType() { 2033 // If the function has a type in the prefix, process it now. 2034 FuncInfo *info{Top()}; 2035 if (info && &info->scope == &scopeHandler_.currScope()) { 2036 if (info->parsedType) { 2037 scopeHandler_.messageHandler().set_currStmtSource(info->source); 2038 if (const auto *type{ 2039 scopeHandler_.ProcessTypeSpec(*info->parsedType, true)}) { 2040 if (!scopeHandler_.context().HasError(info->resultSymbol)) { 2041 info->resultSymbol->SetType(*type); 2042 } 2043 } 2044 info->parsedType = nullptr; 2045 } 2046 } 2047 } 2048 2049 // Called from ConvertTo{Object/Proc}Entity to cope with any appearance 2050 // of the function result in a specification expression. 2051 void FuncResultStack::CompleteTypeIfFunctionResult(Symbol &symbol) { 2052 if (FuncInfo * info{Top()}) { 2053 if (info->resultSymbol == &symbol) { 2054 CompleteFunctionResultType(); 2055 } 2056 } 2057 } 2058 2059 void FuncResultStack::Pop() { 2060 if (!stack_.empty() && &stack_.back().scope == &scopeHandler_.currScope()) { 2061 stack_.pop_back(); 2062 } 2063 } 2064 2065 // ScopeHandler implementation 2066 2067 void ScopeHandler::SayAlreadyDeclared(const parser::Name &name, Symbol &prev) { 2068 SayAlreadyDeclared(name.source, prev); 2069 } 2070 void ScopeHandler::SayAlreadyDeclared(const SourceName &name, Symbol &prev) { 2071 if (context().HasError(prev)) { 2072 // don't report another error about prev 2073 } else { 2074 if (const auto *details{prev.detailsIf<UseDetails>()}) { 2075 Say(name, "'%s' is already declared in this scoping unit"_err_en_US) 2076 .Attach(details->location(), 2077 "It is use-associated with '%s' in module '%s'"_en_US, 2078 details->symbol().name(), GetUsedModule(*details).name()); 2079 } else { 2080 SayAlreadyDeclared(name, prev.name()); 2081 } 2082 context().SetError(prev); 2083 } 2084 } 2085 void ScopeHandler::SayAlreadyDeclared( 2086 const SourceName &name1, const SourceName &name2) { 2087 if (name1.begin() < name2.begin()) { 2088 SayAlreadyDeclared(name2, name1); 2089 } else { 2090 Say(name1, "'%s' is already declared in this scoping unit"_err_en_US) 2091 .Attach(name2, "Previous declaration of '%s'"_en_US, name2); 2092 } 2093 } 2094 2095 void ScopeHandler::SayWithReason(const parser::Name &name, Symbol &symbol, 2096 MessageFixedText &&msg1, Message &&msg2) { 2097 Say(name, std::move(msg1), symbol.name()).Attach(std::move(msg2)); 2098 context().SetError(symbol, msg1.isFatal()); 2099 } 2100 2101 void ScopeHandler::SayWithDecl( 2102 const parser::Name &name, Symbol &symbol, MessageFixedText &&msg) { 2103 Say(name, std::move(msg), symbol.name()) 2104 .Attach(Message{name.source, 2105 symbol.test(Symbol::Flag::Implicit) 2106 ? "Implicit declaration of '%s'"_en_US 2107 : "Declaration of '%s'"_en_US, 2108 name.source}); 2109 context().SetError(symbol, msg.isFatal()); 2110 } 2111 2112 void ScopeHandler::SayLocalMustBeVariable( 2113 const parser::Name &name, Symbol &symbol) { 2114 SayWithDecl(name, symbol, 2115 "The name '%s' must be a variable to appear" 2116 " in a locality-spec"_err_en_US); 2117 } 2118 2119 void ScopeHandler::SayDerivedType( 2120 const SourceName &name, MessageFixedText &&msg, const Scope &type) { 2121 const Symbol &typeSymbol{DEREF(type.GetSymbol())}; 2122 Say(name, std::move(msg), name, typeSymbol.name()) 2123 .Attach(typeSymbol.name(), "Declaration of derived type '%s'"_en_US, 2124 typeSymbol.name()); 2125 } 2126 void ScopeHandler::Say2(const SourceName &name1, MessageFixedText &&msg1, 2127 const SourceName &name2, MessageFixedText &&msg2) { 2128 Say(name1, std::move(msg1)).Attach(name2, std::move(msg2), name2); 2129 } 2130 void ScopeHandler::Say2(const SourceName &name, MessageFixedText &&msg1, 2131 Symbol &symbol, MessageFixedText &&msg2) { 2132 Say2(name, std::move(msg1), symbol.name(), std::move(msg2)); 2133 context().SetError(symbol, msg1.isFatal()); 2134 } 2135 void ScopeHandler::Say2(const parser::Name &name, MessageFixedText &&msg1, 2136 Symbol &symbol, MessageFixedText &&msg2) { 2137 Say2(name.source, std::move(msg1), symbol.name(), std::move(msg2)); 2138 context().SetError(symbol, msg1.isFatal()); 2139 } 2140 2141 // This is essentially GetProgramUnitContaining(), but it can return 2142 // a mutable Scope &, it ignores statement functions, and it fails 2143 // gracefully for error recovery (returning the original Scope). 2144 template <typename T> static T &GetInclusiveScope(T &scope) { 2145 for (T *s{&scope}; !s->IsGlobal(); s = &s->parent()) { 2146 switch (s->kind()) { 2147 case Scope::Kind::Module: 2148 case Scope::Kind::MainProgram: 2149 case Scope::Kind::Subprogram: 2150 case Scope::Kind::BlockData: 2151 if (!s->IsStmtFunction()) { 2152 return *s; 2153 } 2154 break; 2155 default:; 2156 } 2157 } 2158 return scope; 2159 } 2160 2161 Scope &ScopeHandler::InclusiveScope() { return GetInclusiveScope(currScope()); } 2162 2163 Scope *ScopeHandler::GetHostProcedure() { 2164 Scope &parent{InclusiveScope().parent()}; 2165 switch (parent.kind()) { 2166 case Scope::Kind::Subprogram: 2167 return &parent; 2168 case Scope::Kind::MainProgram: 2169 return &parent; 2170 default: 2171 return nullptr; 2172 } 2173 } 2174 2175 Scope &ScopeHandler::NonDerivedTypeScope() { 2176 return currScope_->IsDerivedType() ? currScope_->parent() : *currScope_; 2177 } 2178 2179 void ScopeHandler::PushScope(Scope::Kind kind, Symbol *symbol) { 2180 PushScope(currScope().MakeScope(kind, symbol)); 2181 } 2182 void ScopeHandler::PushScope(Scope &scope) { 2183 currScope_ = &scope; 2184 auto kind{currScope_->kind()}; 2185 if (kind != Scope::Kind::Block) { 2186 BeginScope(scope); 2187 } 2188 // The name of a module or submodule cannot be "used" in its scope, 2189 // as we read 19.3.1(2), so we allow the name to be used as a local 2190 // identifier in the module or submodule too. Same with programs 2191 // (14.1(3)) and BLOCK DATA. 2192 if (!currScope_->IsDerivedType() && kind != Scope::Kind::Module && 2193 kind != Scope::Kind::MainProgram && kind != Scope::Kind::BlockData) { 2194 if (auto *symbol{scope.symbol()}) { 2195 // Create a dummy symbol so we can't create another one with the same 2196 // name. It might already be there if we previously pushed the scope. 2197 SourceName name{symbol->name()}; 2198 if (!FindInScope(scope, name)) { 2199 auto &newSymbol{MakeSymbol(name)}; 2200 if (kind == Scope::Kind::Subprogram) { 2201 // Allow for recursive references. If this symbol is a function 2202 // without an explicit RESULT(), this new symbol will be discarded 2203 // and replaced with an object of the same name. 2204 newSymbol.set_details(HostAssocDetails{*symbol}); 2205 } else { 2206 newSymbol.set_details(MiscDetails{MiscDetails::Kind::ScopeName}); 2207 } 2208 } 2209 } 2210 } 2211 } 2212 void ScopeHandler::PopScope() { 2213 // Entities that are not yet classified as objects or procedures are now 2214 // assumed to be objects. 2215 // TODO: Statement functions 2216 for (auto &pair : currScope()) { 2217 ConvertToObjectEntity(*pair.second); 2218 } 2219 funcResultStack_.Pop(); 2220 // If popping back into a global scope, pop back to the main global scope. 2221 SetScope(currScope_->parent().IsGlobal() ? context().globalScope() 2222 : currScope_->parent()); 2223 } 2224 void ScopeHandler::SetScope(Scope &scope) { 2225 currScope_ = &scope; 2226 ImplicitRulesVisitor::SetScope(InclusiveScope()); 2227 } 2228 2229 Symbol *ScopeHandler::FindSymbol(const parser::Name &name) { 2230 return FindSymbol(currScope(), name); 2231 } 2232 Symbol *ScopeHandler::FindSymbol(const Scope &scope, const parser::Name &name) { 2233 if (scope.IsDerivedType()) { 2234 if (Symbol * symbol{scope.FindComponent(name.source)}) { 2235 if (!symbol->has<ProcBindingDetails>() && 2236 !symbol->test(Symbol::Flag::ParentComp)) { 2237 return Resolve(name, symbol); 2238 } 2239 } 2240 return FindSymbol(scope.parent(), name); 2241 } else { 2242 // In EQUIVALENCE statements only resolve names in the local scope, see 2243 // 19.5.1.4, paragraph 2, item (10) 2244 return Resolve(name, 2245 inEquivalenceStmt_ ? FindInScope(scope, name) 2246 : scope.FindSymbol(name.source)); 2247 } 2248 } 2249 2250 Symbol &ScopeHandler::MakeSymbol( 2251 Scope &scope, const SourceName &name, Attrs attrs) { 2252 if (Symbol * symbol{FindInScope(scope, name)}) { 2253 symbol->attrs() |= attrs; 2254 return *symbol; 2255 } else { 2256 const auto pair{scope.try_emplace(name, attrs, UnknownDetails{})}; 2257 CHECK(pair.second); // name was not found, so must be able to add 2258 return *pair.first->second; 2259 } 2260 } 2261 Symbol &ScopeHandler::MakeSymbol(const SourceName &name, Attrs attrs) { 2262 return MakeSymbol(currScope(), name, attrs); 2263 } 2264 Symbol &ScopeHandler::MakeSymbol(const parser::Name &name, Attrs attrs) { 2265 return Resolve(name, MakeSymbol(name.source, attrs)); 2266 } 2267 Symbol &ScopeHandler::MakeHostAssocSymbol( 2268 const parser::Name &name, const Symbol &hostSymbol) { 2269 Symbol &symbol{*NonDerivedTypeScope() 2270 .try_emplace(name.source, HostAssocDetails{hostSymbol}) 2271 .first->second}; 2272 name.symbol = &symbol; 2273 symbol.attrs() = hostSymbol.attrs(); // TODO: except PRIVATE, PUBLIC? 2274 symbol.flags() = hostSymbol.flags(); 2275 return symbol; 2276 } 2277 Symbol &ScopeHandler::CopySymbol(const SourceName &name, const Symbol &symbol) { 2278 CHECK(!FindInScope(name)); 2279 return MakeSymbol(currScope(), name, symbol.attrs()); 2280 } 2281 2282 // Look for name only in scope, not in enclosing scopes. 2283 Symbol *ScopeHandler::FindInScope( 2284 const Scope &scope, const parser::Name &name) { 2285 return Resolve(name, FindInScope(scope, name.source)); 2286 } 2287 Symbol *ScopeHandler::FindInScope(const Scope &scope, const SourceName &name) { 2288 // all variants of names, e.g. "operator(.ne.)" for "operator(/=)" 2289 for (const std::string &n : GetAllNames(context(), name)) { 2290 auto it{scope.find(SourceName{n})}; 2291 if (it != scope.end()) { 2292 return &*it->second; 2293 } 2294 } 2295 return nullptr; 2296 } 2297 2298 // Find a component or type parameter by name in a derived type or its parents. 2299 Symbol *ScopeHandler::FindInTypeOrParents( 2300 const Scope &scope, const parser::Name &name) { 2301 return Resolve(name, scope.FindComponent(name.source)); 2302 } 2303 Symbol *ScopeHandler::FindInTypeOrParents(const parser::Name &name) { 2304 return FindInTypeOrParents(currScope(), name); 2305 } 2306 2307 void ScopeHandler::EraseSymbol(const parser::Name &name) { 2308 currScope().erase(name.source); 2309 name.symbol = nullptr; 2310 } 2311 2312 static bool NeedsType(const Symbol &symbol) { 2313 return !symbol.GetType() && 2314 common::visit(common::visitors{ 2315 [](const EntityDetails &) { return true; }, 2316 [](const ObjectEntityDetails &) { return true; }, 2317 [](const AssocEntityDetails &) { return true; }, 2318 [&](const ProcEntityDetails &p) { 2319 return symbol.test(Symbol::Flag::Function) && 2320 !symbol.attrs().test(Attr::INTRINSIC) && 2321 !p.interface().type() && !p.interface().symbol(); 2322 }, 2323 [](const auto &) { return false; }, 2324 }, 2325 symbol.details()); 2326 } 2327 2328 void ScopeHandler::ApplyImplicitRules( 2329 Symbol &symbol, bool allowForwardReference) { 2330 funcResultStack_.CompleteTypeIfFunctionResult(symbol); 2331 if (context().HasError(symbol) || !NeedsType(symbol)) { 2332 return; 2333 } 2334 if (const DeclTypeSpec * type{GetImplicitType(symbol)}) { 2335 symbol.set(Symbol::Flag::Implicit); 2336 symbol.SetType(*type); 2337 return; 2338 } 2339 if (symbol.has<ProcEntityDetails>() && !symbol.attrs().test(Attr::EXTERNAL)) { 2340 std::optional<Symbol::Flag> functionOrSubroutineFlag; 2341 if (symbol.test(Symbol::Flag::Function)) { 2342 functionOrSubroutineFlag = Symbol::Flag::Function; 2343 } else if (symbol.test(Symbol::Flag::Subroutine)) { 2344 functionOrSubroutineFlag = Symbol::Flag::Subroutine; 2345 } 2346 if (IsIntrinsic(symbol.name(), functionOrSubroutineFlag)) { 2347 // type will be determined in expression semantics 2348 AcquireIntrinsicProcedureFlags(symbol); 2349 return; 2350 } 2351 } 2352 if (allowForwardReference && ImplicitlyTypeForwardRef(symbol)) { 2353 return; 2354 } 2355 if (!context().HasError(symbol)) { 2356 Say(symbol.name(), "No explicit type declared for '%s'"_err_en_US); 2357 context().SetError(symbol); 2358 } 2359 } 2360 2361 // Extension: Allow forward references to scalar integer dummy arguments 2362 // to appear in specification expressions under IMPLICIT NONE(TYPE) when 2363 // what would otherwise have been their implicit type is default INTEGER. 2364 bool ScopeHandler::ImplicitlyTypeForwardRef(Symbol &symbol) { 2365 if (!inSpecificationPart_ || context().HasError(symbol) || !IsDummy(symbol) || 2366 symbol.Rank() != 0 || 2367 !context().languageFeatures().IsEnabled( 2368 common::LanguageFeature::ForwardRefDummyImplicitNone)) { 2369 return false; 2370 } 2371 const DeclTypeSpec *type{ 2372 GetImplicitType(symbol, false /*ignore IMPLICIT NONE*/)}; 2373 if (!type || !type->IsNumeric(TypeCategory::Integer)) { 2374 return false; 2375 } 2376 auto kind{evaluate::ToInt64(type->numericTypeSpec().kind())}; 2377 if (!kind || *kind != context().GetDefaultKind(TypeCategory::Integer)) { 2378 return false; 2379 } 2380 if (!ConvertToObjectEntity(symbol)) { 2381 return false; 2382 } 2383 // TODO: check no INTENT(OUT)? 2384 if (context().languageFeatures().ShouldWarn( 2385 common::LanguageFeature::ForwardRefDummyImplicitNone)) { 2386 Say(symbol.name(), 2387 "Dummy argument '%s' was used without being explicitly typed"_warn_en_US, 2388 symbol.name()); 2389 } 2390 symbol.set(Symbol::Flag::Implicit); 2391 symbol.SetType(*type); 2392 return true; 2393 } 2394 2395 // Ensure that the symbol for an intrinsic procedure is marked with 2396 // the INTRINSIC attribute. Also set PURE &/or ELEMENTAL as 2397 // appropriate. 2398 void ScopeHandler::AcquireIntrinsicProcedureFlags(Symbol &symbol) { 2399 symbol.attrs().set(Attr::INTRINSIC); 2400 switch (context().intrinsics().GetIntrinsicClass(symbol.name().ToString())) { 2401 case evaluate::IntrinsicClass::elementalFunction: 2402 case evaluate::IntrinsicClass::elementalSubroutine: 2403 symbol.attrs().set(Attr::ELEMENTAL); 2404 symbol.attrs().set(Attr::PURE); 2405 break; 2406 case evaluate::IntrinsicClass::impureSubroutine: 2407 break; 2408 default: 2409 symbol.attrs().set(Attr::PURE); 2410 } 2411 } 2412 2413 const DeclTypeSpec *ScopeHandler::GetImplicitType( 2414 Symbol &symbol, bool respectImplicitNoneType) { 2415 const Scope *scope{&symbol.owner()}; 2416 if (scope->IsGlobal()) { 2417 scope = &currScope(); 2418 } 2419 scope = &GetInclusiveScope(*scope); 2420 const auto *type{implicitRulesMap_->at(scope).GetType( 2421 symbol.name(), respectImplicitNoneType)}; 2422 if (type) { 2423 if (const DerivedTypeSpec * derived{type->AsDerived()}) { 2424 // Resolve any forward-referenced derived type; a quick no-op else. 2425 auto &instantiatable{*const_cast<DerivedTypeSpec *>(derived)}; 2426 instantiatable.Instantiate(currScope()); 2427 } 2428 } 2429 return type; 2430 } 2431 2432 // Convert symbol to be a ObjectEntity or return false if it can't be. 2433 bool ScopeHandler::ConvertToObjectEntity(Symbol &symbol) { 2434 if (symbol.has<ObjectEntityDetails>()) { 2435 // nothing to do 2436 } else if (symbol.has<UnknownDetails>()) { 2437 symbol.set_details(ObjectEntityDetails{}); 2438 } else if (auto *details{symbol.detailsIf<EntityDetails>()}) { 2439 funcResultStack_.CompleteTypeIfFunctionResult(symbol); 2440 symbol.set_details(ObjectEntityDetails{std::move(*details)}); 2441 } else if (auto *useDetails{symbol.detailsIf<UseDetails>()}) { 2442 return useDetails->symbol().has<ObjectEntityDetails>(); 2443 } else if (auto *hostDetails{symbol.detailsIf<HostAssocDetails>()}) { 2444 return hostDetails->symbol().has<ObjectEntityDetails>(); 2445 } else { 2446 return false; 2447 } 2448 return true; 2449 } 2450 // Convert symbol to be a ProcEntity or return false if it can't be. 2451 bool ScopeHandler::ConvertToProcEntity(Symbol &symbol) { 2452 if (symbol.has<ProcEntityDetails>()) { 2453 // nothing to do 2454 } else if (symbol.has<UnknownDetails>()) { 2455 symbol.set_details(ProcEntityDetails{}); 2456 } else if (auto *details{symbol.detailsIf<EntityDetails>()}) { 2457 if (IsFunctionResult(symbol) && 2458 !(IsPointer(symbol) && symbol.attrs().test(Attr::EXTERNAL))) { 2459 // Don't turn function result into a procedure pointer unless both 2460 // POUNTER and EXTERNAL 2461 return false; 2462 } 2463 funcResultStack_.CompleteTypeIfFunctionResult(symbol); 2464 symbol.set_details(ProcEntityDetails{std::move(*details)}); 2465 if (symbol.GetType() && !symbol.test(Symbol::Flag::Implicit)) { 2466 CHECK(!symbol.test(Symbol::Flag::Subroutine)); 2467 symbol.set(Symbol::Flag::Function); 2468 } 2469 } else if (auto *useDetails{symbol.detailsIf<UseDetails>()}) { 2470 return useDetails->symbol().has<ProcEntityDetails>(); 2471 } else if (auto *hostDetails{symbol.detailsIf<HostAssocDetails>()}) { 2472 return hostDetails->symbol().has<ProcEntityDetails>(); 2473 } else { 2474 return false; 2475 } 2476 return true; 2477 } 2478 2479 const DeclTypeSpec &ScopeHandler::MakeNumericType( 2480 TypeCategory category, const std::optional<parser::KindSelector> &kind) { 2481 KindExpr value{GetKindParamExpr(category, kind)}; 2482 if (auto known{evaluate::ToInt64(value)}) { 2483 return context().MakeNumericType(category, static_cast<int>(*known)); 2484 } else { 2485 return currScope_->MakeNumericType(category, std::move(value)); 2486 } 2487 } 2488 2489 const DeclTypeSpec &ScopeHandler::MakeLogicalType( 2490 const std::optional<parser::KindSelector> &kind) { 2491 KindExpr value{GetKindParamExpr(TypeCategory::Logical, kind)}; 2492 if (auto known{evaluate::ToInt64(value)}) { 2493 return context().MakeLogicalType(static_cast<int>(*known)); 2494 } else { 2495 return currScope_->MakeLogicalType(std::move(value)); 2496 } 2497 } 2498 2499 void ScopeHandler::NotePossibleBadForwardRef(const parser::Name &name) { 2500 if (inSpecificationPart_ && name.symbol) { 2501 auto kind{currScope().kind()}; 2502 if ((kind == Scope::Kind::Subprogram && !currScope().IsStmtFunction()) || 2503 kind == Scope::Kind::Block) { 2504 bool isHostAssociated{&name.symbol->owner() == &currScope() 2505 ? name.symbol->has<HostAssocDetails>() 2506 : name.symbol->owner().Contains(currScope())}; 2507 if (isHostAssociated) { 2508 specPartState_.forwardRefs.insert(name.source); 2509 } 2510 } 2511 } 2512 } 2513 2514 std::optional<SourceName> ScopeHandler::HadForwardRef( 2515 const Symbol &symbol) const { 2516 auto iter{specPartState_.forwardRefs.find(symbol.name())}; 2517 if (iter != specPartState_.forwardRefs.end()) { 2518 return *iter; 2519 } 2520 return std::nullopt; 2521 } 2522 2523 bool ScopeHandler::CheckPossibleBadForwardRef(const Symbol &symbol) { 2524 if (!context().HasError(symbol)) { 2525 if (auto fwdRef{HadForwardRef(symbol)}) { 2526 const Symbol *outer{symbol.owner().FindSymbol(symbol.name())}; 2527 if (outer && symbol.has<UseDetails>() && 2528 &symbol.GetUltimate() == &outer->GetUltimate()) { 2529 // e.g. IMPORT of host's USE association 2530 return false; 2531 } 2532 Say(*fwdRef, 2533 "Forward reference to '%s' is not allowed in the same specification part"_err_en_US, 2534 *fwdRef) 2535 .Attach(symbol.name(), "Later declaration of '%s'"_en_US, *fwdRef); 2536 context().SetError(symbol); 2537 return true; 2538 } 2539 if (IsDummy(symbol) && isImplicitNoneType() && 2540 symbol.test(Symbol::Flag::Implicit) && !context().HasError(symbol)) { 2541 // Dummy was implicitly typed despite IMPLICIT NONE(TYPE) in 2542 // ApplyImplicitRules() due to use in a specification expression, 2543 // and no explicit type declaration appeared later. 2544 Say(symbol.name(), 2545 "No explicit type declared for dummy argument '%s'"_err_en_US); 2546 context().SetError(symbol); 2547 return true; 2548 } 2549 } 2550 return false; 2551 } 2552 2553 void ScopeHandler::MakeExternal(Symbol &symbol) { 2554 if (!symbol.attrs().test(Attr::EXTERNAL)) { 2555 symbol.attrs().set(Attr::EXTERNAL); 2556 if (symbol.attrs().test(Attr::INTRINSIC)) { // C840 2557 Say(symbol.name(), 2558 "Symbol '%s' cannot have both EXTERNAL and INTRINSIC attributes"_err_en_US, 2559 symbol.name()); 2560 } 2561 } 2562 } 2563 2564 // ModuleVisitor implementation 2565 2566 bool ModuleVisitor::Pre(const parser::Only &x) { 2567 common::visit(common::visitors{ 2568 [&](const Indirection<parser::GenericSpec> &generic) { 2569 GenericSpecInfo genericSpecInfo{generic.value()}; 2570 AddUseOnly(genericSpecInfo.symbolName()); 2571 AddUse(genericSpecInfo); 2572 }, 2573 [&](const parser::Name &name) { 2574 AddUseOnly(name.source); 2575 Resolve(name, AddUse(name.source, name.source).use); 2576 }, 2577 [&](const parser::Rename &rename) { Walk(rename); }, 2578 }, 2579 x.u); 2580 return false; 2581 } 2582 2583 bool ModuleVisitor::Pre(const parser::Rename::Names &x) { 2584 const auto &localName{std::get<0>(x.t)}; 2585 const auto &useName{std::get<1>(x.t)}; 2586 AddUseRename(useName.source); 2587 SymbolRename rename{AddUse(localName.source, useName.source)}; 2588 if (rename.use) { 2589 EraseRenamedSymbol(*rename.use); 2590 } 2591 Resolve(useName, rename.use); 2592 Resolve(localName, rename.local); 2593 return false; 2594 } 2595 bool ModuleVisitor::Pre(const parser::Rename::Operators &x) { 2596 const parser::DefinedOpName &local{std::get<0>(x.t)}; 2597 const parser::DefinedOpName &use{std::get<1>(x.t)}; 2598 GenericSpecInfo localInfo{local}; 2599 GenericSpecInfo useInfo{use}; 2600 if (IsIntrinsicOperator(context(), local.v.source)) { 2601 Say(local.v, 2602 "Intrinsic operator '%s' may not be used as a defined operator"_err_en_US); 2603 } else if (IsLogicalConstant(context(), local.v.source)) { 2604 Say(local.v, 2605 "Logical constant '%s' may not be used as a defined operator"_err_en_US); 2606 } else { 2607 SymbolRename rename{AddUse(localInfo.symbolName(), useInfo.symbolName())}; 2608 if (rename.use) { 2609 EraseRenamedSymbol(*rename.use); 2610 } 2611 useInfo.Resolve(rename.use); 2612 localInfo.Resolve(rename.local); 2613 } 2614 return false; 2615 } 2616 2617 // Set useModuleScope_ to the Scope of the module being used. 2618 bool ModuleVisitor::Pre(const parser::UseStmt &x) { 2619 std::optional<bool> isIntrinsic; 2620 if (x.nature) { 2621 isIntrinsic = *x.nature == parser::UseStmt::ModuleNature::Intrinsic; 2622 AddAndCheckExplicitIntrinsicUse(x.moduleName.source, *isIntrinsic); 2623 } else if (currScope().IsModule() && currScope().symbol() && 2624 currScope().symbol()->attrs().test(Attr::INTRINSIC)) { 2625 // Intrinsic modules USE only other intrinsic modules 2626 isIntrinsic = true; 2627 } 2628 useModuleScope_ = FindModule(x.moduleName, isIntrinsic); 2629 if (!useModuleScope_) { 2630 return false; 2631 } 2632 // use the name from this source file 2633 useModuleScope_->symbol()->ReplaceName(x.moduleName.source); 2634 return true; 2635 } 2636 2637 void ModuleVisitor::Post(const parser::UseStmt &x) { 2638 if (const auto *list{std::get_if<std::list<parser::Rename>>(&x.u)}) { 2639 // Not a use-only: collect the names that were used in renames, 2640 // then add a use for each public name that was not renamed. 2641 std::set<SourceName> useNames; 2642 for (const auto &rename : *list) { 2643 common::visit(common::visitors{ 2644 [&](const parser::Rename::Names &names) { 2645 useNames.insert(std::get<1>(names.t).source); 2646 }, 2647 [&](const parser::Rename::Operators &ops) { 2648 useNames.insert(std::get<1>(ops.t).v.source); 2649 }, 2650 }, 2651 rename.u); 2652 } 2653 for (const auto &[name, symbol] : *useModuleScope_) { 2654 if (symbol->attrs().test(Attr::PUBLIC) && !IsUseRenamed(symbol->name()) && 2655 (!symbol->attrs().test(Attr::INTRINSIC) || 2656 symbol->has<UseDetails>()) && 2657 !symbol->has<MiscDetails>() && useNames.count(name) == 0) { 2658 SourceName location{x.moduleName.source}; 2659 if (auto *localSymbol{FindInScope(name)}) { 2660 DoAddUse(location, localSymbol->name(), *localSymbol, *symbol); 2661 } else { 2662 DoAddUse(location, location, CopySymbol(name, *symbol), *symbol); 2663 } 2664 } 2665 } 2666 } 2667 useModuleScope_ = nullptr; 2668 } 2669 2670 ModuleVisitor::SymbolRename ModuleVisitor::AddUse( 2671 const SourceName &localName, const SourceName &useName) { 2672 return AddUse(localName, useName, FindInScope(*useModuleScope_, useName)); 2673 } 2674 2675 ModuleVisitor::SymbolRename ModuleVisitor::AddUse( 2676 const SourceName &localName, const SourceName &useName, Symbol *useSymbol) { 2677 if (!useModuleScope_) { 2678 return {}; // error occurred finding module 2679 } 2680 if (!useSymbol) { 2681 Say(useName, "'%s' not found in module '%s'"_err_en_US, MakeOpName(useName), 2682 useModuleScope_->GetName().value()); 2683 return {}; 2684 } 2685 if (useSymbol->attrs().test(Attr::PRIVATE) && 2686 !FindModuleFileContaining(currScope())) { 2687 // Privacy is not enforced in module files so that generic interfaces 2688 // can be resolved to private specific procedures in specification 2689 // expressions. 2690 Say(useName, "'%s' is PRIVATE in '%s'"_err_en_US, MakeOpName(useName), 2691 useModuleScope_->GetName().value()); 2692 return {}; 2693 } 2694 auto &localSymbol{MakeSymbol(localName)}; 2695 DoAddUse(useName, localName, localSymbol, *useSymbol); 2696 return {&localSymbol, useSymbol}; 2697 } 2698 2699 // symbol must be either a Use or a Generic formed by merging two uses. 2700 // Convert it to a UseError with this additional location. 2701 static void ConvertToUseError( 2702 Symbol &symbol, const SourceName &location, const Scope &module) { 2703 const auto *useDetails{symbol.detailsIf<UseDetails>()}; 2704 if (!useDetails) { 2705 auto &genericDetails{symbol.get<GenericDetails>()}; 2706 useDetails = &genericDetails.uses().at(0)->get<UseDetails>(); 2707 } 2708 symbol.set_details( 2709 UseErrorDetails{*useDetails}.add_occurrence(location, module)); 2710 } 2711 2712 // If a symbol has previously been USE-associated and did not appear in a USE 2713 // ONLY clause, erase it from the current scope. This is needed when a name 2714 // appears in a USE rename clause. 2715 void ModuleVisitor::EraseRenamedSymbol(const Symbol &useSymbol) { 2716 const SourceName &name{useSymbol.name()}; 2717 if (const Symbol * symbol{FindInScope(name)}) { 2718 if (auto *useDetails{symbol->detailsIf<UseDetails>()}) { 2719 const Symbol &moduleSymbol{useDetails->symbol()}; 2720 if (moduleSymbol.name() == name && 2721 moduleSymbol.owner() == useSymbol.owner() && IsUseRenamed(name) && 2722 !IsUseOnly(name)) { 2723 EraseSymbol(*symbol); 2724 } 2725 } 2726 } 2727 } 2728 2729 void ModuleVisitor::DoAddUse(SourceName location, SourceName localName, 2730 Symbol &localSymbol, const Symbol &useSymbol) { 2731 if (localName != useSymbol.name()) { 2732 EraseRenamedSymbol(useSymbol); 2733 } 2734 if (auto *details{localSymbol.detailsIf<UseErrorDetails>()}) { 2735 details->add_occurrence(location, *useModuleScope_); 2736 return; 2737 } 2738 2739 if (localSymbol.has<UnknownDetails>()) { 2740 localSymbol.set_details(UseDetails{localName, useSymbol}); 2741 localSymbol.attrs() = 2742 useSymbol.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}; 2743 localSymbol.flags() = useSymbol.flags(); 2744 return; 2745 } 2746 2747 Symbol &localUltimate{localSymbol.GetUltimate()}; 2748 const Symbol &useUltimate{useSymbol.GetUltimate()}; 2749 if (&localUltimate == &useUltimate) { 2750 // use-associating the same symbol again -- ok 2751 return; 2752 } 2753 2754 auto checkAmbiguousDerivedType{[this, location, localName]( 2755 const Symbol *t1, const Symbol *t2) { 2756 if (!t1 || !t2) { 2757 return true; 2758 } else { 2759 t1 = &t1->GetUltimate(); 2760 t2 = &t2->GetUltimate(); 2761 if (&t1 != &t2) { 2762 Say(location, 2763 "Generic interface '%s' has ambiguous derived types from modules '%s' and '%s'"_err_en_US, 2764 localName, t1->owner().GetName().value(), 2765 t2->owner().GetName().value()); 2766 return false; 2767 } 2768 } 2769 }}; 2770 2771 auto *localGeneric{localUltimate.detailsIf<GenericDetails>()}; 2772 const auto *useGeneric{useUltimate.detailsIf<GenericDetails>()}; 2773 auto combine{false}; 2774 if (localGeneric) { 2775 if (useGeneric) { 2776 if (!checkAmbiguousDerivedType( 2777 localGeneric->derivedType(), useGeneric->derivedType())) { 2778 return; 2779 } 2780 combine = true; 2781 } else if (useUltimate.has<DerivedTypeDetails>()) { 2782 if (checkAmbiguousDerivedType( 2783 &useUltimate, localGeneric->derivedType())) { 2784 combine = true; 2785 } else { 2786 return; 2787 } 2788 } else if (&useUltimate == &BypassGeneric(localUltimate)) { 2789 return; // nothing to do; used subprogram is local's specific 2790 } 2791 } else if (useGeneric) { 2792 if (localUltimate.has<DerivedTypeDetails>()) { 2793 if (checkAmbiguousDerivedType( 2794 &localUltimate, useGeneric->derivedType())) { 2795 combine = true; 2796 } else { 2797 return; 2798 } 2799 } else if (&localUltimate == &BypassGeneric(useUltimate).GetUltimate()) { 2800 // Local is the specific of the used generic; replace it. 2801 EraseSymbol(localSymbol); 2802 Symbol &newSymbol{MakeSymbol(localName, 2803 useUltimate.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}, 2804 UseDetails{localName, useUltimate})}; 2805 newSymbol.flags() = useSymbol.flags(); 2806 return; 2807 } 2808 } 2809 if (!combine) { 2810 if (localSymbol.has<UseDetails>() || localSymbol.has<GenericDetails>()) { 2811 ConvertToUseError(localSymbol, location, *useModuleScope_); 2812 } else { 2813 Say(location, 2814 "Cannot use-associate '%s'; it is already declared in this scope"_err_en_US, 2815 localName) 2816 .Attach(localSymbol.name(), "Previous declaration of '%s'"_en_US, 2817 localName); 2818 } 2819 return; 2820 } 2821 2822 // Two items are being use-associated from different modules 2823 // to the same local name. At least one of them must be a generic, 2824 // and the other one can be a generic or a derived type. 2825 // (It could also have been the specific of the generic, but those 2826 // cases are handled above without needing to make a local copy of the 2827 // generic.) 2828 2829 if (localGeneric) { 2830 if (localSymbol.has<UseDetails>()) { 2831 // Create a local copy of a previously use-associated generic so that 2832 // it can be locally extended without corrupting the original. 2833 GenericDetails generic; 2834 generic.CopyFrom(*localGeneric); 2835 EraseSymbol(localSymbol); 2836 Symbol &newSymbol{MakeSymbol( 2837 localSymbol.name(), localSymbol.attrs(), std::move(generic))}; 2838 newSymbol.flags() = localSymbol.flags(); 2839 localGeneric = &newSymbol.get<GenericDetails>(); 2840 localGeneric->AddUse(localSymbol); 2841 } 2842 if (useGeneric) { 2843 // Combine two use-associated generics 2844 localSymbol.attrs() = 2845 useSymbol.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}; 2846 localSymbol.flags() = useSymbol.flags(); 2847 AddGenericUse(*localGeneric, localName, useUltimate); 2848 localGeneric->CopyFrom(*useGeneric); 2849 } else { 2850 CHECK(useUltimate.has<DerivedTypeDetails>()); 2851 localGeneric->set_derivedType( 2852 AddGenericUse(*localGeneric, localName, useUltimate)); 2853 } 2854 } else { 2855 CHECK(useGeneric && localUltimate.has<DerivedTypeDetails>()); 2856 CHECK(localSymbol.has<UseDetails>()); 2857 // Create a local copy of the use-associated generic, then extend it 2858 // with the local derived type. 2859 GenericDetails generic; 2860 generic.CopyFrom(*useGeneric); 2861 EraseSymbol(localSymbol); 2862 Symbol &newSymbol{MakeSymbol(localName, 2863 useUltimate.attrs() & ~Attrs{Attr::PUBLIC, Attr::PRIVATE}, 2864 std::move(generic))}; 2865 newSymbol.flags() = useUltimate.flags(); 2866 auto &newUseGeneric{newSymbol.get<GenericDetails>()}; 2867 AddGenericUse(newUseGeneric, localName, useUltimate); 2868 newUseGeneric.AddUse(localSymbol); 2869 newUseGeneric.set_derivedType(localSymbol); 2870 } 2871 } 2872 2873 void ModuleVisitor::AddUse(const GenericSpecInfo &info) { 2874 if (useModuleScope_) { 2875 const auto &name{info.symbolName()}; 2876 auto rename{AddUse(name, name, FindInScope(*useModuleScope_, name))}; 2877 info.Resolve(rename.use); 2878 } 2879 } 2880 2881 // Create a UseDetails symbol for this USE and add it to generic 2882 Symbol &ModuleVisitor::AddGenericUse( 2883 GenericDetails &generic, const SourceName &name, const Symbol &useSymbol) { 2884 Symbol &newSymbol{ 2885 currScope().MakeSymbol(name, {}, UseDetails{name, useSymbol})}; 2886 generic.AddUse(newSymbol); 2887 return newSymbol; 2888 } 2889 2890 // Enforce C1406 2891 void ModuleVisitor::AddAndCheckExplicitIntrinsicUse( 2892 SourceName name, bool isIntrinsic) { 2893 if (isIntrinsic) { 2894 if (auto iter{explicitNonIntrinsicUses_.find(name)}; 2895 iter != explicitNonIntrinsicUses_.end()) { 2896 Say(name, 2897 "Cannot USE,INTRINSIC module '%s' in the same scope as USE,NON_INTRINSIC"_err_en_US, 2898 name) 2899 .Attach(*iter, "Previous USE of '%s'"_en_US, *iter); 2900 } 2901 explicitIntrinsicUses_.insert(name); 2902 } else { 2903 if (auto iter{explicitIntrinsicUses_.find(name)}; 2904 iter != explicitIntrinsicUses_.end()) { 2905 Say(name, 2906 "Cannot USE,NON_INTRINSIC module '%s' in the same scope as USE,INTRINSIC"_err_en_US, 2907 name) 2908 .Attach(*iter, "Previous USE of '%s'"_en_US, *iter); 2909 } 2910 explicitNonIntrinsicUses_.insert(name); 2911 } 2912 } 2913 2914 bool ModuleVisitor::BeginSubmodule( 2915 const parser::Name &name, const parser::ParentIdentifier &parentId) { 2916 auto &ancestorName{std::get<parser::Name>(parentId.t)}; 2917 auto &parentName{std::get<std::optional<parser::Name>>(parentId.t)}; 2918 Scope *ancestor{FindModule(ancestorName, false /*not intrinsic*/)}; 2919 if (!ancestor) { 2920 return false; 2921 } 2922 Scope *parentScope{parentName 2923 ? FindModule(*parentName, false /*not intrinsic*/, ancestor) 2924 : ancestor}; 2925 if (!parentScope) { 2926 return false; 2927 } 2928 PushScope(*parentScope); // submodule is hosted in parent 2929 BeginModule(name, true); 2930 if (!ancestor->AddSubmodule(name.source, currScope())) { 2931 Say(name, "Module '%s' already has a submodule named '%s'"_err_en_US, 2932 ancestorName.source, name.source); 2933 } 2934 return true; 2935 } 2936 2937 void ModuleVisitor::BeginModule(const parser::Name &name, bool isSubmodule) { 2938 auto &symbol{MakeSymbol(name, ModuleDetails{isSubmodule})}; 2939 auto &details{symbol.get<ModuleDetails>()}; 2940 PushScope(Scope::Kind::Module, &symbol); 2941 details.set_scope(&currScope()); 2942 defaultAccess_ = Attr::PUBLIC; 2943 prevAccessStmt_ = std::nullopt; 2944 } 2945 2946 // Find a module or submodule by name and return its scope. 2947 // If ancestor is present, look for a submodule of that ancestor module. 2948 // May have to read a .mod file to find it. 2949 // If an error occurs, report it and return nullptr. 2950 Scope *ModuleVisitor::FindModule(const parser::Name &name, 2951 std::optional<bool> isIntrinsic, Scope *ancestor) { 2952 ModFileReader reader{context()}; 2953 Scope *scope{reader.Read(name.source, isIntrinsic, ancestor)}; 2954 if (!scope) { 2955 return nullptr; 2956 } 2957 if (DoesScopeContain(scope, currScope())) { // 14.2.2(1) 2958 Say(name, "Module '%s' cannot USE itself"_err_en_US); 2959 } 2960 Resolve(name, scope->symbol()); 2961 return scope; 2962 } 2963 2964 void ModuleVisitor::ApplyDefaultAccess() { 2965 for (auto &pair : currScope()) { 2966 Symbol &symbol = *pair.second; 2967 if (!symbol.attrs().HasAny({Attr::PUBLIC, Attr::PRIVATE})) { 2968 symbol.attrs().set(defaultAccess_); 2969 } 2970 } 2971 } 2972 2973 // InterfaceVistor implementation 2974 2975 bool InterfaceVisitor::Pre(const parser::InterfaceStmt &x) { 2976 bool isAbstract{std::holds_alternative<parser::Abstract>(x.u)}; 2977 genericInfo_.emplace(/*isInterface*/ true, isAbstract); 2978 return BeginAttrs(); 2979 } 2980 2981 void InterfaceVisitor::Post(const parser::InterfaceStmt &) { EndAttrs(); } 2982 2983 void InterfaceVisitor::Post(const parser::EndInterfaceStmt &) { 2984 genericInfo_.pop(); 2985 } 2986 2987 // Create a symbol in genericSymbol_ for this GenericSpec. 2988 bool InterfaceVisitor::Pre(const parser::GenericSpec &x) { 2989 if (auto *symbol{FindInScope(GenericSpecInfo{x}.symbolName())}) { 2990 SetGenericSymbol(*symbol); 2991 } 2992 return false; 2993 } 2994 2995 bool InterfaceVisitor::Pre(const parser::ProcedureStmt &x) { 2996 if (!isGeneric()) { 2997 Say("A PROCEDURE statement is only allowed in a generic interface block"_err_en_US); 2998 return false; 2999 } 3000 auto kind{std::get<parser::ProcedureStmt::Kind>(x.t)}; 3001 const auto &names{std::get<std::list<parser::Name>>(x.t)}; 3002 AddSpecificProcs(names, kind); 3003 return false; 3004 } 3005 3006 bool InterfaceVisitor::Pre(const parser::GenericStmt &) { 3007 genericInfo_.emplace(/*isInterface*/ false); 3008 return true; 3009 } 3010 void InterfaceVisitor::Post(const parser::GenericStmt &x) { 3011 if (auto &accessSpec{std::get<std::optional<parser::AccessSpec>>(x.t)}) { 3012 GetGenericInfo().symbol->attrs().set(AccessSpecToAttr(*accessSpec)); 3013 } 3014 const auto &names{std::get<std::list<parser::Name>>(x.t)}; 3015 AddSpecificProcs(names, ProcedureKind::Procedure); 3016 genericInfo_.pop(); 3017 } 3018 3019 bool InterfaceVisitor::inInterfaceBlock() const { 3020 return !genericInfo_.empty() && GetGenericInfo().isInterface; 3021 } 3022 bool InterfaceVisitor::isGeneric() const { 3023 return !genericInfo_.empty() && GetGenericInfo().symbol; 3024 } 3025 bool InterfaceVisitor::isAbstract() const { 3026 return !genericInfo_.empty() && GetGenericInfo().isAbstract; 3027 } 3028 3029 void InterfaceVisitor::AddSpecificProcs( 3030 const std::list<parser::Name> &names, ProcedureKind kind) { 3031 for (const auto &name : names) { 3032 specificProcs_.emplace( 3033 GetGenericInfo().symbol, std::make_pair(&name, kind)); 3034 } 3035 } 3036 3037 // By now we should have seen all specific procedures referenced by name in 3038 // this generic interface. Resolve those names to symbols. 3039 void InterfaceVisitor::ResolveSpecificsInGeneric(Symbol &generic) { 3040 auto &details{generic.get<GenericDetails>()}; 3041 UnorderedSymbolSet symbolsSeen; 3042 for (const Symbol &symbol : details.specificProcs()) { 3043 symbolsSeen.insert(symbol.GetUltimate()); 3044 } 3045 auto range{specificProcs_.equal_range(&generic)}; 3046 for (auto it{range.first}; it != range.second; ++it) { 3047 const parser::Name *name{it->second.first}; 3048 auto kind{it->second.second}; 3049 const auto *symbol{FindSymbol(*name)}; 3050 if (!symbol) { 3051 Say(*name, "Procedure '%s' not found"_err_en_US); 3052 continue; 3053 } 3054 const Symbol &specific{BypassGeneric(*symbol)}; 3055 const Symbol &ultimate{specific.GetUltimate()}; 3056 if (!ultimate.has<SubprogramDetails>() && 3057 !ultimate.has<SubprogramNameDetails>()) { 3058 Say(*name, "'%s' is not a subprogram"_err_en_US); 3059 continue; 3060 } 3061 if (kind == ProcedureKind::ModuleProcedure) { 3062 if (const auto *nd{ultimate.detailsIf<SubprogramNameDetails>()}) { 3063 if (nd->kind() != SubprogramKind::Module) { 3064 Say(*name, "'%s' is not a module procedure"_err_en_US); 3065 } 3066 } else { 3067 // USE-associated procedure 3068 const auto *sd{ultimate.detailsIf<SubprogramDetails>()}; 3069 CHECK(sd); 3070 if (ultimate.owner().kind() != Scope::Kind::Module || 3071 sd->isInterface()) { 3072 Say(*name, "'%s' is not a module procedure"_err_en_US); 3073 } 3074 } 3075 } 3076 if (symbolsSeen.insert(ultimate).second /*true if added*/) { 3077 // When a specific procedure is a USE association, that association 3078 // is saved in the generic's specifics, not its ultimate symbol, 3079 // so that module file output of interfaces can distinguish them. 3080 details.AddSpecificProc(specific, name->source); 3081 } else if (&specific == &ultimate) { 3082 Say(name->source, 3083 "Procedure '%s' is already specified in generic '%s'"_err_en_US, 3084 name->source, MakeOpName(generic.name())); 3085 } else { 3086 Say(name->source, 3087 "Procedure '%s' from module '%s' is already specified in generic '%s'"_err_en_US, 3088 ultimate.name(), ultimate.owner().GetName().value(), 3089 MakeOpName(generic.name())); 3090 } 3091 } 3092 specificProcs_.erase(range.first, range.second); 3093 } 3094 3095 // Check that the specific procedures are all functions or all subroutines. 3096 // If there is a derived type with the same name they must be functions. 3097 // Set the corresponding flag on generic. 3098 void InterfaceVisitor::CheckGenericProcedures(Symbol &generic) { 3099 ResolveSpecificsInGeneric(generic); 3100 auto &details{generic.get<GenericDetails>()}; 3101 if (auto *proc{details.CheckSpecific()}) { 3102 auto msg{ 3103 "'%s' may not be the name of both a generic interface and a" 3104 " procedure unless it is a specific procedure of the generic"_err_en_US}; 3105 if (proc->name().begin() > generic.name().begin()) { 3106 Say(proc->name(), std::move(msg)); 3107 } else { 3108 Say(generic.name(), std::move(msg)); 3109 } 3110 } 3111 auto &specifics{details.specificProcs()}; 3112 if (specifics.empty()) { 3113 if (details.derivedType()) { 3114 generic.set(Symbol::Flag::Function); 3115 } 3116 return; 3117 } 3118 const Symbol &firstSpecific{specifics.front()}; 3119 bool isFunction{firstSpecific.test(Symbol::Flag::Function)}; 3120 for (const Symbol &specific : specifics) { 3121 if (isFunction != specific.test(Symbol::Flag::Function)) { // C1514 3122 auto &msg{Say(generic.name(), 3123 "Generic interface '%s' has both a function and a subroutine"_err_en_US)}; 3124 if (isFunction) { 3125 msg.Attach(firstSpecific.name(), "Function declaration"_en_US); 3126 msg.Attach(specific.name(), "Subroutine declaration"_en_US); 3127 } else { 3128 msg.Attach(firstSpecific.name(), "Subroutine declaration"_en_US); 3129 msg.Attach(specific.name(), "Function declaration"_en_US); 3130 } 3131 } 3132 } 3133 if (!isFunction && details.derivedType()) { 3134 SayDerivedType(generic.name(), 3135 "Generic interface '%s' may only contain functions due to derived type" 3136 " with same name"_err_en_US, 3137 *details.derivedType()->scope()); 3138 } 3139 generic.set(isFunction ? Symbol::Flag::Function : Symbol::Flag::Subroutine); 3140 } 3141 3142 // SubprogramVisitor implementation 3143 3144 // Return false if it is actually an assignment statement. 3145 bool SubprogramVisitor::HandleStmtFunction(const parser::StmtFunctionStmt &x) { 3146 const auto &name{std::get<parser::Name>(x.t)}; 3147 const DeclTypeSpec *resultType{nullptr}; 3148 // Look up name: provides return type or tells us if it's an array 3149 if (auto *symbol{FindSymbol(name)}) { 3150 auto *details{symbol->detailsIf<EntityDetails>()}; 3151 if (!details) { 3152 badStmtFuncFound_ = true; 3153 return false; 3154 } 3155 // TODO: check that attrs are compatible with stmt func 3156 resultType = details->type(); 3157 symbol->details() = UnknownDetails{}; // will be replaced below 3158 } 3159 if (badStmtFuncFound_) { 3160 Say(name, "'%s' has not been declared as an array"_err_en_US); 3161 return true; 3162 } 3163 auto &symbol{PushSubprogramScope(name, Symbol::Flag::Function)}; 3164 symbol.set(Symbol::Flag::StmtFunction); 3165 EraseSymbol(symbol); // removes symbol added by PushSubprogramScope 3166 auto &details{symbol.get<SubprogramDetails>()}; 3167 for (const auto &dummyName : std::get<std::list<parser::Name>>(x.t)) { 3168 ObjectEntityDetails dummyDetails{true}; 3169 if (auto *dummySymbol{FindInScope(currScope().parent(), dummyName)}) { 3170 if (auto *d{dummySymbol->detailsIf<EntityDetails>()}) { 3171 if (d->type()) { 3172 dummyDetails.set_type(*d->type()); 3173 } 3174 } 3175 } 3176 Symbol &dummy{MakeSymbol(dummyName, std::move(dummyDetails))}; 3177 ApplyImplicitRules(dummy); 3178 details.add_dummyArg(dummy); 3179 } 3180 ObjectEntityDetails resultDetails; 3181 if (resultType) { 3182 resultDetails.set_type(*resultType); 3183 } 3184 resultDetails.set_funcResult(true); 3185 Symbol &result{MakeSymbol(name, std::move(resultDetails))}; 3186 ApplyImplicitRules(result); 3187 details.set_result(result); 3188 const auto &parsedExpr{std::get<parser::Scalar<parser::Expr>>(x.t)}; 3189 Walk(parsedExpr); 3190 // The analysis of the expression that constitutes the body of the 3191 // statement function is deferred to FinishSpecificationPart() so that 3192 // all declarations and implicit typing are complete. 3193 PopScope(); 3194 return true; 3195 } 3196 3197 bool SubprogramVisitor::Pre(const parser::Suffix &suffix) { 3198 if (suffix.resultName) { 3199 if (IsFunction(currScope())) { 3200 if (FuncResultStack::FuncInfo * info{funcResultStack().Top()}) { 3201 if (info->inFunctionStmt) { 3202 info->resultName = &suffix.resultName.value(); 3203 } else { 3204 // will check the result name in Post(EntryStmt) 3205 } 3206 } 3207 } else { 3208 Message &msg{Say(*suffix.resultName, 3209 "RESULT(%s) may appear only in a function"_err_en_US)}; 3210 if (const Symbol * subprogram{InclusiveScope().symbol()}) { 3211 msg.Attach(subprogram->name(), "Containing subprogram"_en_US); 3212 } 3213 } 3214 } 3215 // LanguageBindingSpec deferred to Post(EntryStmt) or, for FunctionStmt, 3216 // all the way to EndSubprogram(). 3217 return false; 3218 } 3219 3220 bool SubprogramVisitor::Pre(const parser::PrefixSpec &x) { 3221 // Save this to process after UseStmt and ImplicitPart 3222 if (const auto *parsedType{std::get_if<parser::DeclarationTypeSpec>(&x.u)}) { 3223 FuncResultStack::FuncInfo &info{DEREF(funcResultStack().Top())}; 3224 if (info.parsedType) { // C1543 3225 Say(currStmtSource().value(), 3226 "FUNCTION prefix cannot specify the type more than once"_err_en_US); 3227 return false; 3228 } else { 3229 info.parsedType = parsedType; 3230 info.source = currStmtSource(); 3231 return false; 3232 } 3233 } else { 3234 return true; 3235 } 3236 } 3237 3238 bool SubprogramVisitor::Pre(const parser::InterfaceBody::Subroutine &x) { 3239 const auto &name{std::get<parser::Name>( 3240 std::get<parser::Statement<parser::SubroutineStmt>>(x.t).statement.t)}; 3241 return BeginSubprogram(name, Symbol::Flag::Subroutine); 3242 } 3243 void SubprogramVisitor::Post(const parser::InterfaceBody::Subroutine &x) { 3244 const auto &stmt{std::get<parser::Statement<parser::SubroutineStmt>>(x.t)}; 3245 EndSubprogram(stmt.source, 3246 &std::get<std::optional<parser::LanguageBindingSpec>>(stmt.statement.t)); 3247 } 3248 bool SubprogramVisitor::Pre(const parser::InterfaceBody::Function &x) { 3249 const auto &name{std::get<parser::Name>( 3250 std::get<parser::Statement<parser::FunctionStmt>>(x.t).statement.t)}; 3251 return BeginSubprogram(name, Symbol::Flag::Function); 3252 } 3253 void SubprogramVisitor::Post(const parser::InterfaceBody::Function &x) { 3254 const auto &stmt{std::get<parser::Statement<parser::FunctionStmt>>(x.t)}; 3255 const auto &maybeSuffix{ 3256 std::get<std::optional<parser::Suffix>>(stmt.statement.t)}; 3257 EndSubprogram(stmt.source, maybeSuffix ? &maybeSuffix->binding : nullptr); 3258 } 3259 3260 bool SubprogramVisitor::Pre(const parser::SubroutineStmt &stmt) { 3261 BeginAttrs(); 3262 Walk(std::get<std::list<parser::PrefixSpec>>(stmt.t)); 3263 Walk(std::get<parser::Name>(stmt.t)); 3264 Walk(std::get<std::list<parser::DummyArg>>(stmt.t)); 3265 // Don't traverse the LanguageBindingSpec now; it's deferred to EndSubprogram. 3266 const auto &name{std::get<parser::Name>(stmt.t)}; 3267 auto &details{PostSubprogramStmt(name)}; 3268 for (const auto &dummyArg : std::get<std::list<parser::DummyArg>>(stmt.t)) { 3269 if (const auto *dummyName{std::get_if<parser::Name>(&dummyArg.u)}) { 3270 Symbol &dummy{MakeSymbol(*dummyName, EntityDetails{true})}; 3271 details.add_dummyArg(dummy); 3272 } else { 3273 details.add_alternateReturn(); 3274 } 3275 } 3276 return false; 3277 } 3278 bool SubprogramVisitor::Pre(const parser::FunctionStmt &) { 3279 FuncResultStack::FuncInfo &info{DEREF(funcResultStack().Top())}; 3280 CHECK(!info.inFunctionStmt); 3281 info.inFunctionStmt = true; 3282 return BeginAttrs(); 3283 } 3284 bool SubprogramVisitor::Pre(const parser::EntryStmt &) { return BeginAttrs(); } 3285 3286 void SubprogramVisitor::Post(const parser::FunctionStmt &stmt) { 3287 const auto &name{std::get<parser::Name>(stmt.t)}; 3288 auto &details{PostSubprogramStmt(name)}; 3289 for (const auto &dummyName : std::get<std::list<parser::Name>>(stmt.t)) { 3290 Symbol &dummy{MakeSymbol(dummyName, EntityDetails{true})}; 3291 details.add_dummyArg(dummy); 3292 } 3293 const parser::Name *funcResultName; 3294 FuncResultStack::FuncInfo &info{DEREF(funcResultStack().Top())}; 3295 CHECK(info.inFunctionStmt); 3296 info.inFunctionStmt = false; 3297 bool distinctResultName{ 3298 info.resultName && info.resultName->source != name.source}; 3299 if (distinctResultName) { 3300 // Note that RESULT is ignored if it has the same name as the function. 3301 // The symbol created by PushScope() is retained as a place-holder 3302 // for error detection. 3303 funcResultName = info.resultName; 3304 } else { 3305 EraseSymbol(name); // was added by PushScope() 3306 funcResultName = &name; 3307 } 3308 if (details.isFunction()) { 3309 CHECK(context().HasError(currScope().symbol())); 3310 } else { 3311 // RESULT(x) can be the same explicitly-named RESULT(x) as an ENTRY 3312 // statement. 3313 Symbol *result{nullptr}; 3314 if (distinctResultName) { 3315 if (auto iter{currScope().find(funcResultName->source)}; 3316 iter != currScope().end()) { 3317 Symbol &entryResult{*iter->second}; 3318 if (IsFunctionResult(entryResult)) { 3319 result = &entryResult; 3320 } 3321 } 3322 } 3323 if (result) { 3324 Resolve(*funcResultName, *result); 3325 } else { 3326 // add function result to function scope 3327 EntityDetails funcResultDetails; 3328 funcResultDetails.set_funcResult(true); 3329 result = &MakeSymbol(*funcResultName, std::move(funcResultDetails)); 3330 } 3331 info.resultSymbol = result; 3332 details.set_result(*result); 3333 } 3334 // C1560. 3335 if (info.resultName && !distinctResultName) { 3336 Say(info.resultName->source, 3337 "The function name should not appear in RESULT, references to '%s' " 3338 "inside the function will be considered as references to the " 3339 "result only"_warn_en_US, 3340 name.source); 3341 // RESULT name was ignored above, the only side effect from doing so will be 3342 // the inability to make recursive calls. The related parser::Name is still 3343 // resolved to the created function result symbol because every parser::Name 3344 // should be resolved to avoid internal errors. 3345 Resolve(*info.resultName, info.resultSymbol); 3346 } 3347 name.symbol = currScope().symbol(); // must not be function result symbol 3348 // Clear the RESULT() name now in case an ENTRY statement in the implicit-part 3349 // has a RESULT() suffix. 3350 info.resultName = nullptr; 3351 } 3352 3353 SubprogramDetails &SubprogramVisitor::PostSubprogramStmt( 3354 const parser::Name &name) { 3355 Symbol &symbol{*currScope().symbol()}; 3356 symbol.attrs() |= EndAttrs(); 3357 if (symbol.attrs().test(Attr::MODULE)) { 3358 symbol.attrs().set(Attr::EXTERNAL, false); 3359 } 3360 return symbol.get<SubprogramDetails>(); 3361 } 3362 3363 void SubprogramVisitor::Post(const parser::EntryStmt &stmt) { 3364 if (const auto &suffix{std::get<std::optional<parser::Suffix>>(stmt.t)}) { 3365 Walk(suffix->binding); 3366 } 3367 PostEntryStmt(stmt); 3368 EndAttrs(); 3369 } 3370 3371 void SubprogramVisitor::CreateEntry( 3372 const parser::EntryStmt &stmt, Symbol &subprogram) { 3373 const auto &entryName{std::get<parser::Name>(stmt.t)}; 3374 Scope &outer{currScope().parent()}; 3375 Symbol::Flag subpFlag{subprogram.test(Symbol::Flag::Function) 3376 ? Symbol::Flag::Function 3377 : Symbol::Flag::Subroutine}; 3378 Attrs attrs; 3379 if (Symbol * extant{FindSymbol(outer, entryName)}) { 3380 if (!HandlePreviousCalls(entryName, *extant, subpFlag)) { 3381 if (outer.IsTopLevel()) { 3382 Say2(entryName, 3383 "'%s' is already defined as a global identifier"_err_en_US, *extant, 3384 "Previous definition of '%s'"_en_US); 3385 } else { 3386 SayAlreadyDeclared(entryName, *extant); 3387 } 3388 return; 3389 } 3390 attrs = extant->attrs(); 3391 } 3392 const auto &suffix{std::get<std::optional<parser::Suffix>>(stmt.t)}; 3393 bool badResultName{false}; 3394 std::optional<SourceName> distinctResultName; 3395 if (suffix && suffix->resultName && 3396 suffix->resultName->source != entryName.source) { 3397 distinctResultName = suffix->resultName->source; 3398 const parser::Name &resultName{*suffix->resultName}; 3399 if (resultName.source == subprogram.name()) { // C1574 3400 Say2(resultName.source, 3401 "RESULT(%s) may not have the same name as the function"_err_en_US, 3402 subprogram, "Containing function"_en_US); 3403 badResultName = true; 3404 } else if (const Symbol * extant{FindSymbol(outer, resultName)}) { // C1574 3405 if (const auto *details{extant->detailsIf<SubprogramDetails>()}) { 3406 if (details->entryScope() == &currScope()) { 3407 Say2(resultName.source, 3408 "RESULT(%s) may not have the same name as an ENTRY in the function"_err_en_US, 3409 extant->name(), "Conflicting ENTRY"_en_US); 3410 badResultName = true; 3411 } 3412 } 3413 } 3414 } 3415 if (outer.IsModule() && !attrs.test(Attr::PRIVATE)) { 3416 attrs.set(Attr::PUBLIC); 3417 } 3418 Symbol *entrySymbol{FindInScope(outer, entryName.source)}; 3419 if (entrySymbol) { 3420 if (auto *generic{entrySymbol->detailsIf<GenericDetails>()}) { 3421 if (auto *specific{generic->specific()}) { 3422 // Forward reference to ENTRY from a generic interface 3423 entrySymbol = specific; 3424 entrySymbol->attrs() |= attrs; 3425 } 3426 } 3427 } else { 3428 entrySymbol = &MakeSymbol(outer, entryName.source, attrs); 3429 } 3430 SubprogramDetails entryDetails; 3431 entryDetails.set_entryScope(currScope()); 3432 entrySymbol->set(subpFlag); 3433 if (subpFlag == Symbol::Flag::Function) { 3434 Symbol *result{nullptr}; 3435 EntityDetails resultDetails; 3436 resultDetails.set_funcResult(true); 3437 if (distinctResultName) { 3438 if (!badResultName) { 3439 // RESULT(x) can be the same explicitly-named RESULT(x) as 3440 // the enclosing function or another ENTRY. 3441 if (auto iter{currScope().find(suffix->resultName->source)}; 3442 iter != currScope().end()) { 3443 result = &*iter->second; 3444 } 3445 if (!result) { 3446 result = &MakeSymbol( 3447 *distinctResultName, Attrs{}, std::move(resultDetails)); 3448 } 3449 Resolve(*suffix->resultName, *result); 3450 } 3451 } else { 3452 result = &MakeSymbol(entryName.source, Attrs{}, std::move(resultDetails)); 3453 } 3454 if (result) { 3455 entryDetails.set_result(*result); 3456 } 3457 } 3458 if (subpFlag == Symbol::Flag::Subroutine || 3459 (distinctResultName && !badResultName)) { 3460 Symbol &assoc{MakeSymbol(entryName.source)}; 3461 assoc.set_details(HostAssocDetails{*entrySymbol}); 3462 assoc.set(Symbol::Flag::Subroutine); 3463 } 3464 Resolve(entryName, *entrySymbol); 3465 Details details{std::move(entryDetails)}; 3466 entrySymbol->set_details(std::move(entryDetails)); 3467 } 3468 3469 void SubprogramVisitor::PostEntryStmt(const parser::EntryStmt &stmt) { 3470 // The entry symbol should have already been created and resolved 3471 // in CreateEntry(), called by BeginSubprogram(), with one exception (below). 3472 const auto &name{std::get<parser::Name>(stmt.t)}; 3473 Scope &inclusiveScope{InclusiveScope()}; 3474 if (!name.symbol) { 3475 if (inclusiveScope.kind() != Scope::Kind::Subprogram) { 3476 Say(name.source, 3477 "ENTRY '%s' may appear only in a subroutine or function"_err_en_US, 3478 name.source); 3479 } else if (FindSeparateModuleSubprogramInterface(inclusiveScope.symbol())) { 3480 Say(name.source, 3481 "ENTRY '%s' may not appear in a separate module procedure"_err_en_US, 3482 name.source); 3483 } else { 3484 // C1571 - entry is nested, so was not put into the program tree; error 3485 // is emitted from MiscChecker in semantics.cpp. 3486 } 3487 return; 3488 } 3489 Symbol &entrySymbol{*name.symbol}; 3490 if (context().HasError(entrySymbol)) { 3491 return; 3492 } 3493 if (!entrySymbol.has<SubprogramDetails>()) { 3494 SayAlreadyDeclared(name, entrySymbol); 3495 return; 3496 } 3497 SubprogramDetails &entryDetails{entrySymbol.get<SubprogramDetails>()}; 3498 CHECK(entryDetails.entryScope() == &inclusiveScope); 3499 entrySymbol.attrs() |= GetAttrs(); 3500 SetBindNameOn(entrySymbol); 3501 for (const auto &dummyArg : std::get<std::list<parser::DummyArg>>(stmt.t)) { 3502 if (const auto *dummyName{std::get_if<parser::Name>(&dummyArg.u)}) { 3503 Symbol *dummy{FindSymbol(*dummyName)}; 3504 if (dummy) { 3505 common::visit( 3506 common::visitors{[](EntityDetails &x) { x.set_isDummy(); }, 3507 [](ObjectEntityDetails &x) { x.set_isDummy(); }, 3508 [](ProcEntityDetails &x) { x.set_isDummy(); }, 3509 [](SubprogramDetails &x) { x.set_isDummy(); }, 3510 [&](const auto &) { 3511 Say2(dummyName->source, 3512 "ENTRY dummy argument '%s' is previously declared as an item that may not be used as a dummy argument"_err_en_US, 3513 dummy->name(), "Previous declaration of '%s'"_en_US); 3514 }}, 3515 dummy->details()); 3516 } else { 3517 dummy = &MakeSymbol(*dummyName, EntityDetails{true}); 3518 if (!inSpecificationPart_) { 3519 ApplyImplicitRules(*dummy); 3520 } 3521 } 3522 entryDetails.add_dummyArg(*dummy); 3523 } else { 3524 if (entrySymbol.test(Symbol::Flag::Function)) { // C1573 3525 Say(name, 3526 "ENTRY in a function may not have an alternate return dummy argument"_err_en_US); 3527 break; 3528 } 3529 entryDetails.add_alternateReturn(); 3530 } 3531 } 3532 } 3533 3534 // A subprogram declared with MODULE PROCEDURE 3535 bool SubprogramVisitor::BeginMpSubprogram(const parser::Name &name) { 3536 auto *symbol{FindSymbol(name)}; 3537 if (symbol && symbol->has<SubprogramNameDetails>()) { 3538 symbol = FindSymbol(currScope().parent(), name); 3539 } 3540 if (!IsSeparateModuleProcedureInterface(symbol)) { 3541 Say(name, "'%s' was not declared a separate module procedure"_err_en_US); 3542 return false; 3543 } 3544 if (symbol->owner() == currScope() && symbol->scope()) { 3545 // This is a MODULE PROCEDURE whose interface appears in its host. 3546 // Convert the module procedure's interface into a subprogram. 3547 SetScope(DEREF(symbol->scope())); 3548 symbol->get<SubprogramDetails>().set_isInterface(false); 3549 } else { 3550 // Copy the interface into a new subprogram scope. 3551 Symbol &newSymbol{MakeSymbol(name, SubprogramDetails{})}; 3552 PushScope(Scope::Kind::Subprogram, &newSymbol); 3553 const auto &details{symbol->get<SubprogramDetails>()}; 3554 auto &newDetails{newSymbol.get<SubprogramDetails>()}; 3555 newDetails.set_moduleInterface(*symbol); 3556 for (const Symbol *dummyArg : details.dummyArgs()) { 3557 if (!dummyArg) { 3558 newDetails.add_alternateReturn(); 3559 } else if (Symbol * copy{currScope().CopySymbol(*dummyArg)}) { 3560 newDetails.add_dummyArg(*copy); 3561 } 3562 } 3563 if (details.isFunction()) { 3564 currScope().erase(symbol->name()); 3565 newDetails.set_result(*currScope().CopySymbol(details.result())); 3566 } 3567 } 3568 return true; 3569 } 3570 3571 // A subprogram or interface declared with SUBROUTINE or FUNCTION 3572 bool SubprogramVisitor::BeginSubprogram(const parser::Name &name, 3573 Symbol::Flag subpFlag, bool hasModulePrefix, 3574 const parser::LanguageBindingSpec *bindingSpec, 3575 const ProgramTree::EntryStmtList *entryStmts) { 3576 if (hasModulePrefix && currScope().IsGlobal()) { // C1547 3577 Say(name, 3578 "'%s' is a MODULE procedure which must be declared within a " 3579 "MODULE or SUBMODULE"_err_en_US); 3580 return false; 3581 } 3582 Symbol *moduleInterface{nullptr}; 3583 if (hasModulePrefix && !inInterfaceBlock()) { 3584 moduleInterface = FindSymbol(currScope(), name); 3585 if (IsSeparateModuleProcedureInterface(moduleInterface)) { 3586 // Subprogram is MODULE FUNCTION or MODULE SUBROUTINE with an interface 3587 // previously defined in the same scope. 3588 currScope().erase(moduleInterface->name()); 3589 } else { 3590 moduleInterface = nullptr; 3591 } 3592 if (!moduleInterface) { 3593 moduleInterface = FindSymbol(currScope().parent(), name); 3594 if (!IsSeparateModuleProcedureInterface(moduleInterface)) { 3595 Say(name, 3596 "'%s' was not declared a separate module procedure"_err_en_US); 3597 return false; 3598 } 3599 } 3600 } 3601 Symbol &newSymbol{PushSubprogramScope(name, subpFlag, bindingSpec)}; 3602 if (moduleInterface) { 3603 newSymbol.get<SubprogramDetails>().set_moduleInterface(*moduleInterface); 3604 if (moduleInterface->attrs().test(Attr::PRIVATE)) { 3605 newSymbol.attrs().set(Attr::PRIVATE); 3606 } else if (moduleInterface->attrs().test(Attr::PUBLIC)) { 3607 newSymbol.attrs().set(Attr::PUBLIC); 3608 } 3609 } 3610 if (entryStmts) { 3611 for (const auto &ref : *entryStmts) { 3612 CreateEntry(*ref, newSymbol); 3613 } 3614 } 3615 return true; 3616 } 3617 3618 void SubprogramVisitor::EndSubprogram( 3619 std::optional<parser::CharBlock> stmtSource, 3620 const std::optional<parser::LanguageBindingSpec> *binding) { 3621 if (binding && *binding && currScope().symbol()) { 3622 // Finally process the BIND(C,NAME=name) now that symbols in the name 3623 // expression will resolve local names. 3624 auto flagRestorer{common::ScopedSet(inSpecificationPart_, false)}; 3625 auto originalStmtSource{messageHandler().currStmtSource()}; 3626 messageHandler().set_currStmtSource(stmtSource); 3627 BeginAttrs(); 3628 Walk(**binding); 3629 SetBindNameOn(*currScope().symbol()); 3630 currScope().symbol()->attrs() |= EndAttrs(); 3631 messageHandler().set_currStmtSource(originalStmtSource); 3632 } 3633 PopScope(); 3634 } 3635 3636 bool SubprogramVisitor::HandlePreviousCalls( 3637 const parser::Name &name, Symbol &symbol, Symbol::Flag subpFlag) { 3638 // If the extant symbol is a generic, check its homonymous specific 3639 // procedure instead if it has one. 3640 if (auto *generic{symbol.detailsIf<GenericDetails>()}) { 3641 return generic->specific() && 3642 HandlePreviousCalls(name, *generic->specific(), subpFlag); 3643 } else if (const auto *proc{symbol.detailsIf<ProcEntityDetails>()}; proc && 3644 !proc->isDummy() && 3645 !symbol.attrs().HasAny(Attrs{Attr::INTRINSIC, Attr::POINTER})) { 3646 // There's a symbol created for previous calls to this subprogram or 3647 // ENTRY's name. We have to replace that symbol in situ to avoid the 3648 // obligation to rewrite symbol pointers in the parse tree. 3649 if (!symbol.test(subpFlag)) { 3650 Say2(name, 3651 subpFlag == Symbol::Flag::Function 3652 ? "'%s' was previously called as a subroutine"_err_en_US 3653 : "'%s' was previously called as a function"_err_en_US, 3654 symbol, "Previous call of '%s'"_en_US); 3655 } 3656 EntityDetails entity; 3657 if (proc->type()) { 3658 entity.set_type(*proc->type()); 3659 } 3660 symbol.details() = std::move(entity); 3661 return true; 3662 } else { 3663 return symbol.has<UnknownDetails>() || symbol.has<SubprogramNameDetails>(); 3664 } 3665 } 3666 3667 void SubprogramVisitor::CheckExtantProc( 3668 const parser::Name &name, Symbol::Flag subpFlag) { 3669 if (auto *prev{FindSymbol(name)}) { 3670 if (IsDummy(*prev)) { 3671 } else if (auto *entity{prev->detailsIf<EntityDetails>()}; 3672 IsPointer(*prev) && !entity->type()) { 3673 // POINTER attribute set before interface 3674 } else if (inInterfaceBlock() && currScope() != prev->owner()) { 3675 // Procedures in an INTERFACE block do not resolve to symbols 3676 // in scopes between the global scope and the current scope. 3677 } else if (!HandlePreviousCalls(name, *prev, subpFlag)) { 3678 SayAlreadyDeclared(name, *prev); 3679 } 3680 } 3681 } 3682 3683 Symbol &SubprogramVisitor::PushSubprogramScope(const parser::Name &name, 3684 Symbol::Flag subpFlag, const parser::LanguageBindingSpec *bindingSpec) { 3685 Symbol *symbol{GetSpecificFromGeneric(name)}; 3686 if (!symbol) { 3687 if (bindingSpec && currScope().IsGlobal() && bindingSpec->v) { 3688 // Create this new top-level subprogram with a binding label 3689 // in a new global scope, so that its symbol's name won't clash 3690 // with another symbol that has a distinct binding label. 3691 PushScope(Scope::Kind::Global, 3692 &MakeSymbol(context().GetTempName(currScope()), Attrs{}, 3693 MiscDetails{MiscDetails::Kind::ScopeName})); 3694 } 3695 CheckExtantProc(name, subpFlag); 3696 symbol = &MakeSymbol(name, SubprogramDetails{}); 3697 } 3698 symbol->ReplaceName(name.source); 3699 symbol->set(subpFlag); 3700 PushScope(Scope::Kind::Subprogram, symbol); 3701 if (subpFlag == Symbol::Flag::Function) { 3702 funcResultStack().Push(currScope()); 3703 } 3704 if (inInterfaceBlock()) { 3705 auto &details{symbol->get<SubprogramDetails>()}; 3706 details.set_isInterface(); 3707 if (isAbstract()) { 3708 symbol->attrs().set(Attr::ABSTRACT); 3709 } else { 3710 MakeExternal(*symbol); 3711 } 3712 if (isGeneric()) { 3713 Symbol &genericSymbol{GetGenericSymbol()}; 3714 if (genericSymbol.has<GenericDetails>()) { 3715 genericSymbol.get<GenericDetails>().AddSpecificProc( 3716 *symbol, name.source); 3717 } else { 3718 CHECK(context().HasError(genericSymbol)); 3719 } 3720 } 3721 set_inheritFromParent(false); 3722 } 3723 FindSymbol(name)->set(subpFlag); // PushScope() created symbol 3724 return *symbol; 3725 } 3726 3727 void SubprogramVisitor::PushBlockDataScope(const parser::Name &name) { 3728 if (auto *prev{FindSymbol(name)}) { 3729 if (prev->attrs().test(Attr::EXTERNAL) && prev->has<ProcEntityDetails>()) { 3730 if (prev->test(Symbol::Flag::Subroutine) || 3731 prev->test(Symbol::Flag::Function)) { 3732 Say2(name, "BLOCK DATA '%s' has been called"_err_en_US, *prev, 3733 "Previous call of '%s'"_en_US); 3734 } 3735 EraseSymbol(name); 3736 } 3737 } 3738 if (name.source.empty()) { 3739 // Don't let unnamed BLOCK DATA conflict with unnamed PROGRAM 3740 PushScope(Scope::Kind::BlockData, nullptr); 3741 } else { 3742 PushScope(Scope::Kind::BlockData, &MakeSymbol(name, SubprogramDetails{})); 3743 } 3744 } 3745 3746 // If name is a generic, return specific subprogram with the same name. 3747 Symbol *SubprogramVisitor::GetSpecificFromGeneric(const parser::Name &name) { 3748 // Search for the name but don't resolve it 3749 if (auto *symbol{currScope().FindSymbol(name.source)}) { 3750 if (auto *details{symbol->detailsIf<GenericDetails>()}) { 3751 // found generic, want subprogram 3752 auto *specific{details->specific()}; 3753 if (!specific) { 3754 specific = 3755 &currScope().MakeSymbol(name.source, Attrs{}, SubprogramDetails{}); 3756 if (details->derivedType()) { 3757 // A specific procedure with the same name as a derived type 3758 SayAlreadyDeclared(name, *details->derivedType()); 3759 } else { 3760 details->set_specific(Resolve(name, *specific)); 3761 } 3762 } else if (isGeneric()) { 3763 SayAlreadyDeclared(name, *specific); 3764 } 3765 if (!specific->has<SubprogramDetails>()) { 3766 specific->set_details(SubprogramDetails{}); 3767 } 3768 return specific; 3769 } 3770 } 3771 return nullptr; 3772 } 3773 3774 // DeclarationVisitor implementation 3775 3776 bool DeclarationVisitor::BeginDecl() { 3777 BeginDeclTypeSpec(); 3778 BeginArraySpec(); 3779 return BeginAttrs(); 3780 } 3781 void DeclarationVisitor::EndDecl() { 3782 EndDeclTypeSpec(); 3783 EndArraySpec(); 3784 EndAttrs(); 3785 } 3786 3787 bool DeclarationVisitor::CheckUseError(const parser::Name &name) { 3788 const auto *details{ 3789 name.symbol ? name.symbol->detailsIf<UseErrorDetails>() : nullptr}; 3790 if (!details) { 3791 return false; 3792 } 3793 Message &msg{Say(name, "Reference to '%s' is ambiguous"_err_en_US)}; 3794 for (const auto &[location, module] : details->occurrences()) { 3795 msg.Attach(location, "'%s' was use-associated from module '%s'"_en_US, 3796 name.source, module->GetName().value()); 3797 } 3798 context().SetError(*name.symbol); 3799 return true; 3800 } 3801 3802 // Report error if accessibility of symbol doesn't match isPrivate. 3803 void DeclarationVisitor::CheckAccessibility( 3804 const SourceName &name, bool isPrivate, Symbol &symbol) { 3805 if (symbol.attrs().test(Attr::PRIVATE) != isPrivate) { 3806 Say2(name, 3807 "'%s' does not have the same accessibility as its previous declaration"_err_en_US, 3808 symbol, "Previous declaration of '%s'"_en_US); 3809 } 3810 } 3811 3812 void DeclarationVisitor::Post(const parser::TypeDeclarationStmt &) { 3813 if (!GetAttrs().HasAny({Attr::POINTER, Attr::ALLOCATABLE})) { // C702 3814 if (const auto *typeSpec{GetDeclTypeSpec()}) { 3815 if (typeSpec->category() == DeclTypeSpec::Character) { 3816 if (typeSpec->characterTypeSpec().length().isDeferred()) { 3817 Say("The type parameter LEN cannot be deferred without" 3818 " the POINTER or ALLOCATABLE attribute"_err_en_US); 3819 } 3820 } else if (const DerivedTypeSpec * derivedSpec{typeSpec->AsDerived()}) { 3821 for (const auto &pair : derivedSpec->parameters()) { 3822 if (pair.second.isDeferred()) { 3823 Say(currStmtSource().value(), 3824 "The value of type parameter '%s' cannot be deferred" 3825 " without the POINTER or ALLOCATABLE attribute"_err_en_US, 3826 pair.first); 3827 } 3828 } 3829 } 3830 } 3831 } 3832 EndDecl(); 3833 } 3834 3835 void DeclarationVisitor::Post(const parser::DimensionStmt::Declaration &x) { 3836 DeclareObjectEntity(std::get<parser::Name>(x.t)); 3837 } 3838 void DeclarationVisitor::Post(const parser::CodimensionDecl &x) { 3839 DeclareObjectEntity(std::get<parser::Name>(x.t)); 3840 } 3841 3842 bool DeclarationVisitor::Pre(const parser::Initialization &) { 3843 // Defer inspection of initializers to Initialization() so that the 3844 // symbol being initialized will be available within the initialization 3845 // expression. 3846 return false; 3847 } 3848 3849 void DeclarationVisitor::Post(const parser::EntityDecl &x) { 3850 const auto &name{std::get<parser::ObjectName>(x.t)}; 3851 Attrs attrs{attrs_ ? HandleSaveName(name.source, *attrs_) : Attrs{}}; 3852 Symbol &symbol{DeclareUnknownEntity(name, attrs)}; 3853 symbol.ReplaceName(name.source); 3854 if (const auto &init{std::get<std::optional<parser::Initialization>>(x.t)}) { 3855 if (ConvertToObjectEntity(symbol)) { 3856 Initialization(name, *init, false); 3857 } 3858 } else if (attrs.test(Attr::PARAMETER)) { // C882, C883 3859 Say(name, "Missing initialization for parameter '%s'"_err_en_US); 3860 } 3861 } 3862 3863 void DeclarationVisitor::Post(const parser::PointerDecl &x) { 3864 const auto &name{std::get<parser::Name>(x.t)}; 3865 if (const auto &deferredShapeSpecs{ 3866 std::get<std::optional<parser::DeferredShapeSpecList>>(x.t)}) { 3867 CHECK(arraySpec().empty()); 3868 BeginArraySpec(); 3869 set_arraySpec(AnalyzeDeferredShapeSpecList(context(), *deferredShapeSpecs)); 3870 Symbol &symbol{DeclareObjectEntity(name, Attrs{Attr::POINTER})}; 3871 symbol.ReplaceName(name.source); 3872 EndArraySpec(); 3873 } else { 3874 HandleAttributeStmt(Attr::POINTER, std::get<parser::Name>(x.t)); 3875 } 3876 } 3877 3878 bool DeclarationVisitor::Pre(const parser::BindEntity &x) { 3879 auto kind{std::get<parser::BindEntity::Kind>(x.t)}; 3880 auto &name{std::get<parser::Name>(x.t)}; 3881 Symbol *symbol; 3882 if (kind == parser::BindEntity::Kind::Object) { 3883 symbol = &HandleAttributeStmt(Attr::BIND_C, name); 3884 } else { 3885 symbol = &MakeCommonBlockSymbol(name); 3886 symbol->attrs().set(Attr::BIND_C); 3887 } 3888 SetBindNameOn(*symbol); 3889 return false; 3890 } 3891 bool DeclarationVisitor::Pre(const parser::OldParameterStmt &x) { 3892 inOldStyleParameterStmt_ = true; 3893 Walk(x.v); 3894 inOldStyleParameterStmt_ = false; 3895 return false; 3896 } 3897 bool DeclarationVisitor::Pre(const parser::NamedConstantDef &x) { 3898 auto &name{std::get<parser::NamedConstant>(x.t).v}; 3899 auto &symbol{HandleAttributeStmt(Attr::PARAMETER, name)}; 3900 if (!ConvertToObjectEntity(symbol) || 3901 symbol.test(Symbol::Flag::CrayPointer) || 3902 symbol.test(Symbol::Flag::CrayPointee)) { 3903 SayWithDecl( 3904 name, symbol, "PARAMETER attribute not allowed on '%s'"_err_en_US); 3905 return false; 3906 } 3907 const auto &expr{std::get<parser::ConstantExpr>(x.t)}; 3908 auto &details{symbol.get<ObjectEntityDetails>()}; 3909 if (inOldStyleParameterStmt_) { 3910 // non-standard extension PARAMETER statement (no parentheses) 3911 Walk(expr); 3912 auto folded{EvaluateExpr(expr)}; 3913 if (details.type()) { 3914 SayWithDecl(name, symbol, 3915 "Alternative style PARAMETER '%s' must not already have an explicit type"_err_en_US); 3916 } else if (folded) { 3917 auto at{expr.thing.value().source}; 3918 if (evaluate::IsActuallyConstant(*folded)) { 3919 if (const auto *type{currScope().GetType(*folded)}) { 3920 if (type->IsPolymorphic()) { 3921 Say(at, "The expression must not be polymorphic"_err_en_US); 3922 } else if (auto shape{ToArraySpec( 3923 GetFoldingContext(), evaluate::GetShape(*folded))}) { 3924 // The type of the named constant is assumed from the expression. 3925 details.set_type(*type); 3926 details.set_init(std::move(*folded)); 3927 details.set_shape(std::move(*shape)); 3928 } else { 3929 Say(at, "The expression must have constant shape"_err_en_US); 3930 } 3931 } else { 3932 Say(at, "The expression must have a known type"_err_en_US); 3933 } 3934 } else { 3935 Say(at, "The expression must be a constant of known type"_err_en_US); 3936 } 3937 } 3938 } else { 3939 // standard-conforming PARAMETER statement (with parentheses) 3940 ApplyImplicitRules(symbol); 3941 Walk(expr); 3942 if (auto converted{EvaluateNonPointerInitializer( 3943 symbol, expr, expr.thing.value().source)}) { 3944 details.set_init(std::move(*converted)); 3945 } 3946 } 3947 return false; 3948 } 3949 bool DeclarationVisitor::Pre(const parser::NamedConstant &x) { 3950 const parser::Name &name{x.v}; 3951 if (!FindSymbol(name)) { 3952 Say(name, "Named constant '%s' not found"_err_en_US); 3953 } else { 3954 CheckUseError(name); 3955 } 3956 return false; 3957 } 3958 3959 bool DeclarationVisitor::Pre(const parser::Enumerator &enumerator) { 3960 const parser::Name &name{std::get<parser::NamedConstant>(enumerator.t).v}; 3961 Symbol *symbol{FindSymbol(name)}; 3962 if (symbol && !symbol->has<UnknownDetails>()) { 3963 // Contrary to named constants appearing in a PARAMETER statement, 3964 // enumerator names should not have their type, dimension or any other 3965 // attributes defined before they are declared in the enumerator statement, 3966 // with the exception of accessibility. 3967 // This is not explicitly forbidden by the standard, but they are scalars 3968 // which type is left for the compiler to chose, so do not let users try to 3969 // tamper with that. 3970 SayAlreadyDeclared(name, *symbol); 3971 symbol = nullptr; 3972 } else { 3973 // Enumerators are treated as PARAMETER (section 7.6 paragraph (4)) 3974 symbol = &MakeSymbol(name, Attrs{Attr::PARAMETER}, ObjectEntityDetails{}); 3975 symbol->SetType(context().MakeNumericType( 3976 TypeCategory::Integer, evaluate::CInteger::kind)); 3977 } 3978 3979 if (auto &init{std::get<std::optional<parser::ScalarIntConstantExpr>>( 3980 enumerator.t)}) { 3981 Walk(*init); // Resolve names in expression before evaluation. 3982 if (auto value{EvaluateInt64(context(), *init)}) { 3983 // Cast all init expressions to C_INT so that they can then be 3984 // safely incremented (see 7.6 Note 2). 3985 enumerationState_.value = static_cast<int>(*value); 3986 } else { 3987 Say(name, 3988 "Enumerator value could not be computed " 3989 "from the given expression"_err_en_US); 3990 // Prevent resolution of next enumerators value 3991 enumerationState_.value = std::nullopt; 3992 } 3993 } 3994 3995 if (symbol) { 3996 if (enumerationState_.value) { 3997 symbol->get<ObjectEntityDetails>().set_init(SomeExpr{ 3998 evaluate::Expr<evaluate::CInteger>{*enumerationState_.value}}); 3999 } else { 4000 context().SetError(*symbol); 4001 } 4002 } 4003 4004 if (enumerationState_.value) { 4005 (*enumerationState_.value)++; 4006 } 4007 return false; 4008 } 4009 4010 void DeclarationVisitor::Post(const parser::EnumDef &) { 4011 enumerationState_ = EnumeratorState{}; 4012 } 4013 4014 bool DeclarationVisitor::Pre(const parser::AccessSpec &x) { 4015 Attr attr{AccessSpecToAttr(x)}; 4016 if (!NonDerivedTypeScope().IsModule()) { // C817 4017 Say(currStmtSource().value(), 4018 "%s attribute may only appear in the specification part of a module"_err_en_US, 4019 EnumToString(attr)); 4020 } 4021 CheckAndSet(attr); 4022 return false; 4023 } 4024 4025 bool DeclarationVisitor::Pre(const parser::AsynchronousStmt &x) { 4026 return HandleAttributeStmt(Attr::ASYNCHRONOUS, x.v); 4027 } 4028 bool DeclarationVisitor::Pre(const parser::ContiguousStmt &x) { 4029 return HandleAttributeStmt(Attr::CONTIGUOUS, x.v); 4030 } 4031 bool DeclarationVisitor::Pre(const parser::ExternalStmt &x) { 4032 HandleAttributeStmt(Attr::EXTERNAL, x.v); 4033 for (const auto &name : x.v) { 4034 auto *symbol{FindSymbol(name)}; 4035 if (!ConvertToProcEntity(DEREF(symbol))) { 4036 SayWithDecl( 4037 name, *symbol, "EXTERNAL attribute not allowed on '%s'"_err_en_US); 4038 } else if (symbol->attrs().test(Attr::INTRINSIC)) { // C840 4039 Say(symbol->name(), 4040 "Symbol '%s' cannot have both INTRINSIC and EXTERNAL attributes"_err_en_US, 4041 symbol->name()); 4042 } 4043 } 4044 return false; 4045 } 4046 bool DeclarationVisitor::Pre(const parser::IntentStmt &x) { 4047 auto &intentSpec{std::get<parser::IntentSpec>(x.t)}; 4048 auto &names{std::get<std::list<parser::Name>>(x.t)}; 4049 return CheckNotInBlock("INTENT") && // C1107 4050 HandleAttributeStmt(IntentSpecToAttr(intentSpec), names); 4051 } 4052 bool DeclarationVisitor::Pre(const parser::IntrinsicStmt &x) { 4053 HandleAttributeStmt(Attr::INTRINSIC, x.v); 4054 for (const auto &name : x.v) { 4055 if (!IsIntrinsic(name.source, std::nullopt)) { 4056 Say(name.source, "'%s' is not a known intrinsic procedure"_err_en_US); 4057 } 4058 auto &symbol{DEREF(FindSymbol(name))}; 4059 if (symbol.has<GenericDetails>()) { 4060 // Generic interface is extending intrinsic; ok 4061 } else if (!ConvertToProcEntity(symbol)) { 4062 SayWithDecl( 4063 name, symbol, "INTRINSIC attribute not allowed on '%s'"_err_en_US); 4064 } else if (symbol.attrs().test(Attr::EXTERNAL)) { // C840 4065 Say(symbol.name(), 4066 "Symbol '%s' cannot have both EXTERNAL and INTRINSIC attributes"_err_en_US, 4067 symbol.name()); 4068 } else if (symbol.GetType()) { 4069 // These warnings are worded so that they should make sense in either 4070 // order. 4071 Say(symbol.name(), 4072 "Explicit type declaration ignored for intrinsic function '%s'"_warn_en_US, 4073 symbol.name()) 4074 .Attach(name.source, 4075 "INTRINSIC statement for explicitly-typed '%s'"_en_US, 4076 name.source); 4077 } 4078 } 4079 return false; 4080 } 4081 bool DeclarationVisitor::Pre(const parser::OptionalStmt &x) { 4082 return CheckNotInBlock("OPTIONAL") && // C1107 4083 HandleAttributeStmt(Attr::OPTIONAL, x.v); 4084 } 4085 bool DeclarationVisitor::Pre(const parser::ProtectedStmt &x) { 4086 return HandleAttributeStmt(Attr::PROTECTED, x.v); 4087 } 4088 bool DeclarationVisitor::Pre(const parser::ValueStmt &x) { 4089 return CheckNotInBlock("VALUE") && // C1107 4090 HandleAttributeStmt(Attr::VALUE, x.v); 4091 } 4092 bool DeclarationVisitor::Pre(const parser::VolatileStmt &x) { 4093 return HandleAttributeStmt(Attr::VOLATILE, x.v); 4094 } 4095 // Handle a statement that sets an attribute on a list of names. 4096 bool DeclarationVisitor::HandleAttributeStmt( 4097 Attr attr, const std::list<parser::Name> &names) { 4098 for (const auto &name : names) { 4099 HandleAttributeStmt(attr, name); 4100 } 4101 return false; 4102 } 4103 Symbol &DeclarationVisitor::HandleAttributeStmt( 4104 Attr attr, const parser::Name &name) { 4105 auto *symbol{FindInScope(name)}; 4106 if (attr == Attr::ASYNCHRONOUS || attr == Attr::VOLATILE) { 4107 // these can be set on a symbol that is host-assoc or use-assoc 4108 if (!symbol && 4109 (currScope().kind() == Scope::Kind::Subprogram || 4110 currScope().kind() == Scope::Kind::Block)) { 4111 if (auto *hostSymbol{FindSymbol(name)}) { 4112 symbol = &MakeHostAssocSymbol(name, *hostSymbol); 4113 } 4114 } 4115 } else if (symbol && symbol->has<UseDetails>()) { 4116 Say(currStmtSource().value(), 4117 "Cannot change %s attribute on use-associated '%s'"_err_en_US, 4118 EnumToString(attr), name.source); 4119 return *symbol; 4120 } 4121 if (!symbol) { 4122 symbol = &MakeSymbol(name, EntityDetails{}); 4123 } 4124 symbol->attrs().set(attr); 4125 symbol->attrs() = HandleSaveName(name.source, symbol->attrs()); 4126 return *symbol; 4127 } 4128 // C1107 4129 bool DeclarationVisitor::CheckNotInBlock(const char *stmt) { 4130 if (currScope().kind() == Scope::Kind::Block) { 4131 Say(MessageFormattedText{ 4132 "%s statement is not allowed in a BLOCK construct"_err_en_US, stmt}); 4133 return false; 4134 } else { 4135 return true; 4136 } 4137 } 4138 4139 void DeclarationVisitor::Post(const parser::ObjectDecl &x) { 4140 CHECK(objectDeclAttr_); 4141 const auto &name{std::get<parser::ObjectName>(x.t)}; 4142 DeclareObjectEntity(name, Attrs{*objectDeclAttr_}); 4143 } 4144 4145 // Declare an entity not yet known to be an object or proc. 4146 Symbol &DeclarationVisitor::DeclareUnknownEntity( 4147 const parser::Name &name, Attrs attrs) { 4148 if (!arraySpec().empty() || !coarraySpec().empty()) { 4149 return DeclareObjectEntity(name, attrs); 4150 } else { 4151 Symbol &symbol{DeclareEntity<EntityDetails>(name, attrs)}; 4152 if (auto *type{GetDeclTypeSpec()}) { 4153 SetType(name, *type); 4154 } 4155 charInfo_.length.reset(); 4156 SetBindNameOn(symbol); 4157 if (symbol.attrs().test(Attr::EXTERNAL)) { 4158 ConvertToProcEntity(symbol); 4159 } 4160 return symbol; 4161 } 4162 } 4163 4164 bool DeclarationVisitor::HasCycle( 4165 const Symbol &procSymbol, const ProcInterface &interface) { 4166 SourceOrderedSymbolSet procsInCycle; 4167 procsInCycle.insert(procSymbol); 4168 const ProcInterface *thisInterface{&interface}; 4169 bool haveInterface{true}; 4170 while (haveInterface) { 4171 haveInterface = false; 4172 if (const Symbol * interfaceSymbol{thisInterface->symbol()}) { 4173 if (procsInCycle.count(*interfaceSymbol) > 0) { 4174 for (const auto &procInCycle : procsInCycle) { 4175 Say(procInCycle->name(), 4176 "The interface for procedure '%s' is recursively " 4177 "defined"_err_en_US, 4178 procInCycle->name()); 4179 context().SetError(*procInCycle); 4180 } 4181 return true; 4182 } else if (const auto *procDetails{ 4183 interfaceSymbol->detailsIf<ProcEntityDetails>()}) { 4184 haveInterface = true; 4185 thisInterface = &procDetails->interface(); 4186 procsInCycle.insert(*interfaceSymbol); 4187 } 4188 } 4189 } 4190 return false; 4191 } 4192 4193 Symbol &DeclarationVisitor::DeclareProcEntity( 4194 const parser::Name &name, Attrs attrs, const ProcInterface &interface) { 4195 Symbol &symbol{DeclareEntity<ProcEntityDetails>(name, attrs)}; 4196 if (auto *details{symbol.detailsIf<ProcEntityDetails>()}) { 4197 if (details->IsInterfaceSet()) { 4198 SayWithDecl(name, symbol, 4199 "The interface for procedure '%s' has already been " 4200 "declared"_err_en_US); 4201 context().SetError(symbol); 4202 } else if (HasCycle(symbol, interface)) { 4203 return symbol; 4204 } else if (interface.type()) { 4205 symbol.set(Symbol::Flag::Function); 4206 } else if (interface.symbol()) { 4207 if (interface.symbol()->test(Symbol::Flag::Function)) { 4208 symbol.set(Symbol::Flag::Function); 4209 } else if (interface.symbol()->test(Symbol::Flag::Subroutine)) { 4210 symbol.set(Symbol::Flag::Subroutine); 4211 } 4212 } 4213 details->set_interface(interface); 4214 SetBindNameOn(symbol); 4215 SetPassNameOn(symbol); 4216 } 4217 return symbol; 4218 } 4219 4220 Symbol &DeclarationVisitor::DeclareObjectEntity( 4221 const parser::Name &name, Attrs attrs) { 4222 Symbol &symbol{DeclareEntity<ObjectEntityDetails>(name, attrs)}; 4223 if (auto *details{symbol.detailsIf<ObjectEntityDetails>()}) { 4224 if (auto *type{GetDeclTypeSpec()}) { 4225 SetType(name, *type); 4226 } 4227 if (!arraySpec().empty()) { 4228 if (details->IsArray()) { 4229 if (!context().HasError(symbol)) { 4230 Say(name, 4231 "The dimensions of '%s' have already been declared"_err_en_US); 4232 context().SetError(symbol); 4233 } 4234 } else { 4235 details->set_shape(arraySpec()); 4236 } 4237 } 4238 if (!coarraySpec().empty()) { 4239 if (details->IsCoarray()) { 4240 if (!context().HasError(symbol)) { 4241 Say(name, 4242 "The codimensions of '%s' have already been declared"_err_en_US); 4243 context().SetError(symbol); 4244 } 4245 } else { 4246 details->set_coshape(coarraySpec()); 4247 } 4248 } 4249 SetBindNameOn(symbol); 4250 } 4251 ClearArraySpec(); 4252 ClearCoarraySpec(); 4253 charInfo_.length.reset(); 4254 return symbol; 4255 } 4256 4257 void DeclarationVisitor::Post(const parser::IntegerTypeSpec &x) { 4258 SetDeclTypeSpec(MakeNumericType(TypeCategory::Integer, x.v)); 4259 } 4260 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Real &x) { 4261 SetDeclTypeSpec(MakeNumericType(TypeCategory::Real, x.kind)); 4262 } 4263 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Complex &x) { 4264 SetDeclTypeSpec(MakeNumericType(TypeCategory::Complex, x.kind)); 4265 } 4266 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Logical &x) { 4267 SetDeclTypeSpec(MakeLogicalType(x.kind)); 4268 } 4269 void DeclarationVisitor::Post(const parser::IntrinsicTypeSpec::Character &) { 4270 if (!charInfo_.length) { 4271 charInfo_.length = ParamValue{1, common::TypeParamAttr::Len}; 4272 } 4273 if (!charInfo_.kind) { 4274 charInfo_.kind = 4275 KindExpr{context().GetDefaultKind(TypeCategory::Character)}; 4276 } 4277 SetDeclTypeSpec(currScope().MakeCharacterType( 4278 std::move(*charInfo_.length), std::move(*charInfo_.kind))); 4279 charInfo_ = {}; 4280 } 4281 void DeclarationVisitor::Post(const parser::CharSelector::LengthAndKind &x) { 4282 charInfo_.kind = EvaluateSubscriptIntExpr(x.kind); 4283 std::optional<std::int64_t> intKind{ToInt64(charInfo_.kind)}; 4284 if (intKind && 4285 !evaluate::IsValidKindOfIntrinsicType( 4286 TypeCategory::Character, *intKind)) { // C715, C719 4287 Say(currStmtSource().value(), 4288 "KIND value (%jd) not valid for CHARACTER"_err_en_US, *intKind); 4289 charInfo_.kind = std::nullopt; // prevent further errors 4290 } 4291 if (x.length) { 4292 charInfo_.length = GetParamValue(*x.length, common::TypeParamAttr::Len); 4293 } 4294 } 4295 void DeclarationVisitor::Post(const parser::CharLength &x) { 4296 if (const auto *length{std::get_if<std::uint64_t>(&x.u)}) { 4297 charInfo_.length = ParamValue{ 4298 static_cast<ConstantSubscript>(*length), common::TypeParamAttr::Len}; 4299 } else { 4300 charInfo_.length = GetParamValue( 4301 std::get<parser::TypeParamValue>(x.u), common::TypeParamAttr::Len); 4302 } 4303 } 4304 void DeclarationVisitor::Post(const parser::LengthSelector &x) { 4305 if (const auto *param{std::get_if<parser::TypeParamValue>(&x.u)}) { 4306 charInfo_.length = GetParamValue(*param, common::TypeParamAttr::Len); 4307 } 4308 } 4309 4310 bool DeclarationVisitor::Pre(const parser::KindParam &x) { 4311 if (const auto *kind{std::get_if< 4312 parser::Scalar<parser::Integer<parser::Constant<parser::Name>>>>( 4313 &x.u)}) { 4314 const parser::Name &name{kind->thing.thing.thing}; 4315 if (!FindSymbol(name)) { 4316 Say(name, "Parameter '%s' not found"_err_en_US); 4317 } 4318 } 4319 return false; 4320 } 4321 4322 bool DeclarationVisitor::Pre(const parser::DeclarationTypeSpec::Type &) { 4323 CHECK(GetDeclTypeSpecCategory() == DeclTypeSpec::Category::TypeDerived); 4324 return true; 4325 } 4326 4327 void DeclarationVisitor::Post(const parser::DeclarationTypeSpec::Type &type) { 4328 const parser::Name &derivedName{std::get<parser::Name>(type.derived.t)}; 4329 if (const Symbol * derivedSymbol{derivedName.symbol}) { 4330 CheckForAbstractType(*derivedSymbol); // C706 4331 } 4332 } 4333 4334 bool DeclarationVisitor::Pre(const parser::DeclarationTypeSpec::Class &) { 4335 SetDeclTypeSpecCategory(DeclTypeSpec::Category::ClassDerived); 4336 return true; 4337 } 4338 4339 void DeclarationVisitor::Post( 4340 const parser::DeclarationTypeSpec::Class &parsedClass) { 4341 const auto &typeName{std::get<parser::Name>(parsedClass.derived.t)}; 4342 if (auto spec{ResolveDerivedType(typeName)}; 4343 spec && !IsExtensibleType(&*spec)) { // C705 4344 SayWithDecl(typeName, *typeName.symbol, 4345 "Non-extensible derived type '%s' may not be used with CLASS" 4346 " keyword"_err_en_US); 4347 } 4348 } 4349 4350 void DeclarationVisitor::Post(const parser::DerivedTypeSpec &x) { 4351 const auto &typeName{std::get<parser::Name>(x.t)}; 4352 auto spec{ResolveDerivedType(typeName)}; 4353 if (!spec) { 4354 return; 4355 } 4356 bool seenAnyName{false}; 4357 for (const auto &typeParamSpec : 4358 std::get<std::list<parser::TypeParamSpec>>(x.t)) { 4359 const auto &optKeyword{ 4360 std::get<std::optional<parser::Keyword>>(typeParamSpec.t)}; 4361 std::optional<SourceName> name; 4362 if (optKeyword) { 4363 seenAnyName = true; 4364 name = optKeyword->v.source; 4365 } else if (seenAnyName) { 4366 Say(typeName.source, "Type parameter value must have a name"_err_en_US); 4367 continue; 4368 } 4369 const auto &value{std::get<parser::TypeParamValue>(typeParamSpec.t)}; 4370 // The expressions in a derived type specifier whose values define 4371 // non-defaulted type parameters are evaluated (folded) in the enclosing 4372 // scope. The KIND/LEN distinction is resolved later in 4373 // DerivedTypeSpec::CookParameters(). 4374 ParamValue param{GetParamValue(value, common::TypeParamAttr::Kind)}; 4375 if (!param.isExplicit() || param.GetExplicit()) { 4376 spec->AddRawParamValue(optKeyword, std::move(param)); 4377 } 4378 } 4379 4380 // The DerivedTypeSpec *spec is used initially as a search key. 4381 // If it turns out to have the same name and actual parameter 4382 // value expressions as another DerivedTypeSpec in the current 4383 // scope does, then we'll use that extant spec; otherwise, when this 4384 // spec is distinct from all derived types previously instantiated 4385 // in the current scope, this spec will be moved into that collection. 4386 const auto &dtDetails{spec->typeSymbol().get<DerivedTypeDetails>()}; 4387 auto category{GetDeclTypeSpecCategory()}; 4388 if (dtDetails.isForwardReferenced()) { 4389 DeclTypeSpec &type{currScope().MakeDerivedType(category, std::move(*spec))}; 4390 SetDeclTypeSpec(type); 4391 return; 4392 } 4393 // Normalize parameters to produce a better search key. 4394 spec->CookParameters(GetFoldingContext()); 4395 if (!spec->MightBeParameterized()) { 4396 spec->EvaluateParameters(context()); 4397 } 4398 if (const DeclTypeSpec * 4399 extant{currScope().FindInstantiatedDerivedType(*spec, category)}) { 4400 // This derived type and parameter expressions (if any) are already present 4401 // in this scope. 4402 SetDeclTypeSpec(*extant); 4403 } else { 4404 DeclTypeSpec &type{currScope().MakeDerivedType(category, std::move(*spec))}; 4405 DerivedTypeSpec &derived{type.derivedTypeSpec()}; 4406 if (derived.MightBeParameterized() && 4407 currScope().IsParameterizedDerivedType()) { 4408 // Defer instantiation; use the derived type's definition's scope. 4409 derived.set_scope(DEREF(spec->typeSymbol().scope())); 4410 } else if (&currScope() == spec->typeSymbol().scope()) { 4411 // Direct recursive use of a type in the definition of one of its 4412 // components: defer instantiation 4413 } else { 4414 auto restorer{ 4415 GetFoldingContext().messages().SetLocation(currStmtSource().value())}; 4416 derived.Instantiate(currScope()); 4417 } 4418 SetDeclTypeSpec(type); 4419 } 4420 // Capture the DerivedTypeSpec in the parse tree for use in building 4421 // structure constructor expressions. 4422 x.derivedTypeSpec = &GetDeclTypeSpec()->derivedTypeSpec(); 4423 } 4424 4425 void DeclarationVisitor::Post(const parser::DeclarationTypeSpec::Record &rec) { 4426 const auto &typeName{rec.v}; 4427 if (auto spec{ResolveDerivedType(typeName)}) { 4428 spec->CookParameters(GetFoldingContext()); 4429 spec->EvaluateParameters(context()); 4430 if (const DeclTypeSpec * 4431 extant{currScope().FindInstantiatedDerivedType( 4432 *spec, DeclTypeSpec::TypeDerived)}) { 4433 SetDeclTypeSpec(*extant); 4434 } else { 4435 Say(typeName.source, "%s is not a known STRUCTURE"_err_en_US, 4436 typeName.source); 4437 } 4438 } 4439 } 4440 4441 // The descendents of DerivedTypeDef in the parse tree are visited directly 4442 // in this Pre() routine so that recursive use of the derived type can be 4443 // supported in the components. 4444 bool DeclarationVisitor::Pre(const parser::DerivedTypeDef &x) { 4445 auto &stmt{std::get<parser::Statement<parser::DerivedTypeStmt>>(x.t)}; 4446 Walk(stmt); 4447 Walk(std::get<std::list<parser::Statement<parser::TypeParamDefStmt>>>(x.t)); 4448 auto &scope{currScope()}; 4449 CHECK(scope.symbol()); 4450 CHECK(scope.symbol()->scope() == &scope); 4451 auto &details{scope.symbol()->get<DerivedTypeDetails>()}; 4452 details.set_isForwardReferenced(false); 4453 std::set<SourceName> paramNames; 4454 for (auto ¶mName : std::get<std::list<parser::Name>>(stmt.statement.t)) { 4455 details.add_paramName(paramName.source); 4456 auto *symbol{FindInScope(scope, paramName)}; 4457 if (!symbol) { 4458 Say(paramName, 4459 "No definition found for type parameter '%s'"_err_en_US); // C742 4460 // No symbol for a type param. Create one and mark it as containing an 4461 // error to improve subsequent semantic processing 4462 BeginAttrs(); 4463 Symbol *typeParam{MakeTypeSymbol( 4464 paramName, TypeParamDetails{common::TypeParamAttr::Len})}; 4465 context().SetError(*typeParam); 4466 EndAttrs(); 4467 } else if (!symbol->has<TypeParamDetails>()) { 4468 Say2(paramName, "'%s' is not defined as a type parameter"_err_en_US, 4469 *symbol, "Definition of '%s'"_en_US); // C741 4470 } 4471 if (!paramNames.insert(paramName.source).second) { 4472 Say(paramName, 4473 "Duplicate type parameter name: '%s'"_err_en_US); // C731 4474 } 4475 } 4476 for (const auto &[name, symbol] : currScope()) { 4477 if (symbol->has<TypeParamDetails>() && !paramNames.count(name)) { 4478 SayDerivedType(name, 4479 "'%s' is not a type parameter of this derived type"_err_en_US, 4480 currScope()); // C741 4481 } 4482 } 4483 Walk(std::get<std::list<parser::Statement<parser::PrivateOrSequence>>>(x.t)); 4484 const auto &componentDefs{ 4485 std::get<std::list<parser::Statement<parser::ComponentDefStmt>>>(x.t)}; 4486 Walk(componentDefs); 4487 if (derivedTypeInfo_.sequence) { 4488 details.set_sequence(true); 4489 if (componentDefs.empty()) { // C740 4490 Say(stmt.source, 4491 "A sequence type must have at least one component"_err_en_US); 4492 } 4493 if (!details.paramNames().empty()) { // C740 4494 Say(stmt.source, 4495 "A sequence type may not have type parameters"_err_en_US); 4496 } 4497 if (derivedTypeInfo_.extends) { // C735 4498 Say(stmt.source, 4499 "A sequence type may not have the EXTENDS attribute"_err_en_US); 4500 } 4501 } 4502 Walk(std::get<std::optional<parser::TypeBoundProcedurePart>>(x.t)); 4503 Walk(std::get<parser::Statement<parser::EndTypeStmt>>(x.t)); 4504 derivedTypeInfo_ = {}; 4505 PopScope(); 4506 return false; 4507 } 4508 4509 bool DeclarationVisitor::Pre(const parser::DerivedTypeStmt &) { 4510 return BeginAttrs(); 4511 } 4512 void DeclarationVisitor::Post(const parser::DerivedTypeStmt &x) { 4513 auto &name{std::get<parser::Name>(x.t)}; 4514 // Resolve the EXTENDS() clause before creating the derived 4515 // type's symbol to foil attempts to recursively extend a type. 4516 auto *extendsName{derivedTypeInfo_.extends}; 4517 std::optional<DerivedTypeSpec> extendsType{ 4518 ResolveExtendsType(name, extendsName)}; 4519 auto &symbol{MakeSymbol(name, GetAttrs(), DerivedTypeDetails{})}; 4520 symbol.ReplaceName(name.source); 4521 derivedTypeInfo_.type = &symbol; 4522 PushScope(Scope::Kind::DerivedType, &symbol); 4523 if (extendsType) { 4524 // Declare the "parent component"; private if the type is. 4525 // Any symbol stored in the EXTENDS() clause is temporarily 4526 // hidden so that a new symbol can be created for the parent 4527 // component without producing spurious errors about already 4528 // existing. 4529 const Symbol &extendsSymbol{extendsType->typeSymbol()}; 4530 auto restorer{common::ScopedSet(extendsName->symbol, nullptr)}; 4531 if (OkToAddComponent(*extendsName, &extendsSymbol)) { 4532 auto &comp{DeclareEntity<ObjectEntityDetails>(*extendsName, Attrs{})}; 4533 comp.attrs().set( 4534 Attr::PRIVATE, extendsSymbol.attrs().test(Attr::PRIVATE)); 4535 comp.set(Symbol::Flag::ParentComp); 4536 DeclTypeSpec &type{currScope().MakeDerivedType( 4537 DeclTypeSpec::TypeDerived, std::move(*extendsType))}; 4538 type.derivedTypeSpec().set_scope(*extendsSymbol.scope()); 4539 comp.SetType(type); 4540 DerivedTypeDetails &details{symbol.get<DerivedTypeDetails>()}; 4541 details.add_component(comp); 4542 } 4543 } 4544 EndAttrs(); 4545 } 4546 4547 void DeclarationVisitor::Post(const parser::TypeParamDefStmt &x) { 4548 auto *type{GetDeclTypeSpec()}; 4549 auto attr{std::get<common::TypeParamAttr>(x.t)}; 4550 for (auto &decl : std::get<std::list<parser::TypeParamDecl>>(x.t)) { 4551 auto &name{std::get<parser::Name>(decl.t)}; 4552 if (Symbol * symbol{MakeTypeSymbol(name, TypeParamDetails{attr})}) { 4553 SetType(name, *type); 4554 if (auto &init{ 4555 std::get<std::optional<parser::ScalarIntConstantExpr>>(decl.t)}) { 4556 if (auto maybeExpr{EvaluateNonPointerInitializer( 4557 *symbol, *init, init->thing.thing.thing.value().source)}) { 4558 if (auto *intExpr{std::get_if<SomeIntExpr>(&maybeExpr->u)}) { 4559 symbol->get<TypeParamDetails>().set_init(std::move(*intExpr)); 4560 } 4561 } 4562 } 4563 } 4564 } 4565 EndDecl(); 4566 } 4567 bool DeclarationVisitor::Pre(const parser::TypeAttrSpec::Extends &x) { 4568 if (derivedTypeInfo_.extends) { 4569 Say(currStmtSource().value(), 4570 "Attribute 'EXTENDS' cannot be used more than once"_err_en_US); 4571 } else { 4572 derivedTypeInfo_.extends = &x.v; 4573 } 4574 return false; 4575 } 4576 4577 bool DeclarationVisitor::Pre(const parser::PrivateStmt &) { 4578 if (!currScope().parent().IsModule()) { 4579 Say("PRIVATE is only allowed in a derived type that is" 4580 " in a module"_err_en_US); // C766 4581 } else if (derivedTypeInfo_.sawContains) { 4582 derivedTypeInfo_.privateBindings = true; 4583 } else if (!derivedTypeInfo_.privateComps) { 4584 derivedTypeInfo_.privateComps = true; 4585 } else { 4586 Say("PRIVATE may not appear more than once in" 4587 " derived type components"_warn_en_US); // C738 4588 } 4589 return false; 4590 } 4591 bool DeclarationVisitor::Pre(const parser::SequenceStmt &) { 4592 if (derivedTypeInfo_.sequence) { 4593 Say("SEQUENCE may not appear more than once in" 4594 " derived type components"_warn_en_US); // C738 4595 } 4596 derivedTypeInfo_.sequence = true; 4597 return false; 4598 } 4599 void DeclarationVisitor::Post(const parser::ComponentDecl &x) { 4600 const auto &name{std::get<parser::Name>(x.t)}; 4601 auto attrs{GetAttrs()}; 4602 if (derivedTypeInfo_.privateComps && 4603 !attrs.HasAny({Attr::PUBLIC, Attr::PRIVATE})) { 4604 attrs.set(Attr::PRIVATE); 4605 } 4606 if (const auto *declType{GetDeclTypeSpec()}) { 4607 if (const auto *derived{declType->AsDerived()}) { 4608 if (!attrs.HasAny({Attr::POINTER, Attr::ALLOCATABLE})) { 4609 if (derivedTypeInfo_.type == &derived->typeSymbol()) { // C744 4610 Say("Recursive use of the derived type requires " 4611 "POINTER or ALLOCATABLE"_err_en_US); 4612 } 4613 } 4614 // TODO: This would be more appropriate in CheckDerivedType() 4615 if (auto it{FindCoarrayUltimateComponent(*derived)}) { // C748 4616 std::string ultimateName{it.BuildResultDesignatorName()}; 4617 // Strip off the leading "%" 4618 if (ultimateName.length() > 1) { 4619 ultimateName.erase(0, 1); 4620 if (attrs.HasAny({Attr::POINTER, Attr::ALLOCATABLE})) { 4621 evaluate::AttachDeclaration( 4622 Say(name.source, 4623 "A component with a POINTER or ALLOCATABLE attribute may " 4624 "not " 4625 "be of a type with a coarray ultimate component (named " 4626 "'%s')"_err_en_US, 4627 ultimateName), 4628 derived->typeSymbol()); 4629 } 4630 if (!arraySpec().empty() || !coarraySpec().empty()) { 4631 evaluate::AttachDeclaration( 4632 Say(name.source, 4633 "An array or coarray component may not be of a type with a " 4634 "coarray ultimate component (named '%s')"_err_en_US, 4635 ultimateName), 4636 derived->typeSymbol()); 4637 } 4638 } 4639 } 4640 } 4641 } 4642 if (OkToAddComponent(name)) { 4643 auto &symbol{DeclareObjectEntity(name, attrs)}; 4644 if (symbol.has<ObjectEntityDetails>()) { 4645 if (auto &init{std::get<std::optional<parser::Initialization>>(x.t)}) { 4646 Initialization(name, *init, true); 4647 } 4648 } 4649 currScope().symbol()->get<DerivedTypeDetails>().add_component(symbol); 4650 } 4651 ClearArraySpec(); 4652 ClearCoarraySpec(); 4653 } 4654 void DeclarationVisitor::Post(const parser::FillDecl &x) { 4655 // Replace "%FILL" with a distinct generated name 4656 const auto &name{std::get<parser::Name>(x.t)}; 4657 const_cast<SourceName &>(name.source) = context().GetTempName(currScope()); 4658 if (OkToAddComponent(name)) { 4659 auto &symbol{DeclareObjectEntity(name, GetAttrs())}; 4660 currScope().symbol()->get<DerivedTypeDetails>().add_component(symbol); 4661 } 4662 ClearArraySpec(); 4663 } 4664 bool DeclarationVisitor::Pre(const parser::ProcedureDeclarationStmt &) { 4665 CHECK(!interfaceName_); 4666 return BeginDecl(); 4667 } 4668 void DeclarationVisitor::Post(const parser::ProcedureDeclarationStmt &) { 4669 interfaceName_ = nullptr; 4670 EndDecl(); 4671 } 4672 bool DeclarationVisitor::Pre(const parser::DataComponentDefStmt &x) { 4673 // Overrides parse tree traversal so as to handle attributes first, 4674 // so POINTER & ALLOCATABLE enable forward references to derived types. 4675 Walk(std::get<std::list<parser::ComponentAttrSpec>>(x.t)); 4676 set_allowForwardReferenceToDerivedType( 4677 GetAttrs().HasAny({Attr::POINTER, Attr::ALLOCATABLE})); 4678 Walk(std::get<parser::DeclarationTypeSpec>(x.t)); 4679 set_allowForwardReferenceToDerivedType(false); 4680 if (derivedTypeInfo_.sequence) { // C740 4681 if (const auto *declType{GetDeclTypeSpec()}) { 4682 if (!declType->AsIntrinsic() && !declType->IsSequenceType()) { 4683 if (GetAttrs().test(Attr::POINTER) && 4684 context().IsEnabled(common::LanguageFeature::PointerInSeqType)) { 4685 if (context().ShouldWarn(common::LanguageFeature::PointerInSeqType)) { 4686 Say("A sequence type data component that is a pointer to a non-sequence type is not standard"_port_en_US); 4687 } 4688 } else { 4689 Say("A sequence type data component must either be of an intrinsic type or a derived sequence type"_err_en_US); 4690 } 4691 } 4692 } 4693 } 4694 Walk(std::get<std::list<parser::ComponentOrFill>>(x.t)); 4695 return false; 4696 } 4697 bool DeclarationVisitor::Pre(const parser::ProcComponentDefStmt &) { 4698 CHECK(!interfaceName_); 4699 return true; 4700 } 4701 void DeclarationVisitor::Post(const parser::ProcComponentDefStmt &) { 4702 interfaceName_ = nullptr; 4703 } 4704 bool DeclarationVisitor::Pre(const parser::ProcPointerInit &x) { 4705 if (auto *name{std::get_if<parser::Name>(&x.u)}) { 4706 return !NameIsKnownOrIntrinsic(*name); 4707 } 4708 return true; 4709 } 4710 void DeclarationVisitor::Post(const parser::ProcInterface &x) { 4711 if (auto *name{std::get_if<parser::Name>(&x.u)}) { 4712 interfaceName_ = name; 4713 NoteInterfaceName(*name); 4714 } 4715 } 4716 void DeclarationVisitor::Post(const parser::ProcDecl &x) { 4717 const auto &name{std::get<parser::Name>(x.t)}; 4718 ProcInterface interface; 4719 if (interfaceName_) { 4720 interface.set_symbol(*interfaceName_->symbol); 4721 } else if (auto *type{GetDeclTypeSpec()}) { 4722 interface.set_type(*type); 4723 } 4724 auto attrs{HandleSaveName(name.source, GetAttrs())}; 4725 DerivedTypeDetails *dtDetails{nullptr}; 4726 if (Symbol * symbol{currScope().symbol()}) { 4727 dtDetails = symbol->detailsIf<DerivedTypeDetails>(); 4728 } 4729 if (!dtDetails) { 4730 attrs.set(Attr::EXTERNAL); 4731 } 4732 Symbol &symbol{DeclareProcEntity(name, attrs, interface)}; 4733 symbol.ReplaceName(name.source); 4734 if (dtDetails) { 4735 dtDetails->add_component(symbol); 4736 } 4737 } 4738 4739 bool DeclarationVisitor::Pre(const parser::TypeBoundProcedurePart &) { 4740 derivedTypeInfo_.sawContains = true; 4741 return true; 4742 } 4743 4744 // Resolve binding names from type-bound generics, saved in genericBindings_. 4745 void DeclarationVisitor::Post(const parser::TypeBoundProcedurePart &) { 4746 // track specifics seen for the current generic to detect duplicates: 4747 const Symbol *currGeneric{nullptr}; 4748 std::set<SourceName> specifics; 4749 for (const auto &[generic, bindingName] : genericBindings_) { 4750 if (generic != currGeneric) { 4751 currGeneric = generic; 4752 specifics.clear(); 4753 } 4754 auto [it, inserted]{specifics.insert(bindingName->source)}; 4755 if (!inserted) { 4756 Say(*bindingName, // C773 4757 "Binding name '%s' was already specified for generic '%s'"_err_en_US, 4758 bindingName->source, generic->name()) 4759 .Attach(*it, "Previous specification of '%s'"_en_US, *it); 4760 continue; 4761 } 4762 auto *symbol{FindInTypeOrParents(*bindingName)}; 4763 if (!symbol) { 4764 Say(*bindingName, // C772 4765 "Binding name '%s' not found in this derived type"_err_en_US); 4766 } else if (!symbol->has<ProcBindingDetails>()) { 4767 SayWithDecl(*bindingName, *symbol, // C772 4768 "'%s' is not the name of a specific binding of this type"_err_en_US); 4769 } else { 4770 generic->get<GenericDetails>().AddSpecificProc( 4771 *symbol, bindingName->source); 4772 } 4773 } 4774 genericBindings_.clear(); 4775 } 4776 4777 void DeclarationVisitor::Post(const parser::ContainsStmt &) { 4778 if (derivedTypeInfo_.sequence) { 4779 Say("A sequence type may not have a CONTAINS statement"_err_en_US); // C740 4780 } 4781 } 4782 4783 void DeclarationVisitor::Post( 4784 const parser::TypeBoundProcedureStmt::WithoutInterface &x) { 4785 if (GetAttrs().test(Attr::DEFERRED)) { // C783 4786 Say("DEFERRED is only allowed when an interface-name is provided"_err_en_US); 4787 } 4788 for (auto &declaration : x.declarations) { 4789 auto &bindingName{std::get<parser::Name>(declaration.t)}; 4790 auto &optName{std::get<std::optional<parser::Name>>(declaration.t)}; 4791 const parser::Name &procedureName{optName ? *optName : bindingName}; 4792 Symbol *procedure{FindSymbol(procedureName)}; 4793 if (!procedure) { 4794 procedure = NoteInterfaceName(procedureName); 4795 } 4796 if (auto *s{MakeTypeSymbol(bindingName, ProcBindingDetails{*procedure})}) { 4797 SetPassNameOn(*s); 4798 if (GetAttrs().test(Attr::DEFERRED)) { 4799 context().SetError(*s); 4800 } 4801 } 4802 } 4803 } 4804 4805 void DeclarationVisitor::CheckBindings( 4806 const parser::TypeBoundProcedureStmt::WithoutInterface &tbps) { 4807 CHECK(currScope().IsDerivedType()); 4808 for (auto &declaration : tbps.declarations) { 4809 auto &bindingName{std::get<parser::Name>(declaration.t)}; 4810 if (Symbol * binding{FindInScope(bindingName)}) { 4811 if (auto *details{binding->detailsIf<ProcBindingDetails>()}) { 4812 const Symbol *procedure{FindSubprogram(details->symbol())}; 4813 if (!CanBeTypeBoundProc(procedure)) { 4814 if (details->symbol().name() != binding->name()) { 4815 Say(binding->name(), 4816 "The binding of '%s' ('%s') must be either an accessible " 4817 "module procedure or an external procedure with " 4818 "an explicit interface"_err_en_US, 4819 binding->name(), details->symbol().name()); 4820 } else { 4821 Say(binding->name(), 4822 "'%s' must be either an accessible module procedure " 4823 "or an external procedure with an explicit interface"_err_en_US, 4824 binding->name()); 4825 } 4826 context().SetError(*binding); 4827 } 4828 } 4829 } 4830 } 4831 } 4832 4833 void DeclarationVisitor::Post( 4834 const parser::TypeBoundProcedureStmt::WithInterface &x) { 4835 if (!GetAttrs().test(Attr::DEFERRED)) { // C783 4836 Say("DEFERRED is required when an interface-name is provided"_err_en_US); 4837 } 4838 if (Symbol * interface{NoteInterfaceName(x.interfaceName)}) { 4839 for (auto &bindingName : x.bindingNames) { 4840 if (auto *s{ 4841 MakeTypeSymbol(bindingName, ProcBindingDetails{*interface})}) { 4842 SetPassNameOn(*s); 4843 if (!GetAttrs().test(Attr::DEFERRED)) { 4844 context().SetError(*s); 4845 } 4846 } 4847 } 4848 } 4849 } 4850 4851 void DeclarationVisitor::Post(const parser::FinalProcedureStmt &x) { 4852 if (currScope().IsDerivedType() && currScope().symbol()) { 4853 if (auto *details{currScope().symbol()->detailsIf<DerivedTypeDetails>()}) { 4854 for (const auto &subrName : x.v) { 4855 if (const auto *name{ResolveName(subrName)}) { 4856 auto pair{ 4857 details->finals().emplace(name->source, DEREF(name->symbol))}; 4858 if (!pair.second) { // C787 4859 Say(name->source, 4860 "FINAL subroutine '%s' already appeared in this derived type"_err_en_US, 4861 name->source) 4862 .Attach(pair.first->first, 4863 "earlier appearance of this FINAL subroutine"_en_US); 4864 } 4865 } 4866 } 4867 } 4868 } 4869 } 4870 4871 bool DeclarationVisitor::Pre(const parser::TypeBoundGenericStmt &x) { 4872 const auto &accessSpec{std::get<std::optional<parser::AccessSpec>>(x.t)}; 4873 const auto &genericSpec{std::get<Indirection<parser::GenericSpec>>(x.t)}; 4874 const auto &bindingNames{std::get<std::list<parser::Name>>(x.t)}; 4875 auto info{GenericSpecInfo{genericSpec.value()}}; 4876 SourceName symbolName{info.symbolName()}; 4877 bool isPrivate{accessSpec ? accessSpec->v == parser::AccessSpec::Kind::Private 4878 : derivedTypeInfo_.privateBindings}; 4879 auto *genericSymbol{FindInScope(symbolName)}; 4880 if (genericSymbol) { 4881 if (!genericSymbol->has<GenericDetails>()) { 4882 genericSymbol = nullptr; // MakeTypeSymbol will report the error below 4883 } 4884 } else { 4885 // look in parent types: 4886 Symbol *inheritedSymbol{nullptr}; 4887 for (const auto &name : GetAllNames(context(), symbolName)) { 4888 inheritedSymbol = currScope().FindComponent(SourceName{name}); 4889 if (inheritedSymbol) { 4890 break; 4891 } 4892 } 4893 if (inheritedSymbol && inheritedSymbol->has<GenericDetails>()) { 4894 CheckAccessibility(symbolName, isPrivate, *inheritedSymbol); // C771 4895 } 4896 } 4897 if (genericSymbol) { 4898 CheckAccessibility(symbolName, isPrivate, *genericSymbol); // C771 4899 } else { 4900 genericSymbol = MakeTypeSymbol(symbolName, GenericDetails{}); 4901 if (!genericSymbol) { 4902 return false; 4903 } 4904 if (isPrivate) { 4905 genericSymbol->attrs().set(Attr::PRIVATE); 4906 } 4907 } 4908 for (const parser::Name &bindingName : bindingNames) { 4909 genericBindings_.emplace(genericSymbol, &bindingName); 4910 } 4911 info.Resolve(genericSymbol); 4912 return false; 4913 } 4914 4915 // DEC STRUCTUREs are handled thus to allow for nested definitions. 4916 bool DeclarationVisitor::Pre(const parser::StructureDef &def) { 4917 const auto &structureStatement{ 4918 std::get<parser::Statement<parser::StructureStmt>>(def.t)}; 4919 auto saveDerivedTypeInfo{derivedTypeInfo_}; 4920 derivedTypeInfo_ = {}; 4921 derivedTypeInfo_.isStructure = true; 4922 derivedTypeInfo_.sequence = true; 4923 Scope *previousStructure{nullptr}; 4924 if (saveDerivedTypeInfo.isStructure) { 4925 previousStructure = &currScope(); 4926 PopScope(); 4927 } 4928 const parser::StructureStmt &structStmt{structureStatement.statement}; 4929 const auto &name{std::get<std::optional<parser::Name>>(structStmt.t)}; 4930 if (!name) { 4931 // Construct a distinct generated name for an anonymous structure 4932 auto &mutableName{const_cast<std::optional<parser::Name> &>(name)}; 4933 mutableName.emplace( 4934 parser::Name{context().GetTempName(currScope()), nullptr}); 4935 } 4936 auto &symbol{MakeSymbol(*name, DerivedTypeDetails{})}; 4937 symbol.ReplaceName(name->source); 4938 symbol.get<DerivedTypeDetails>().set_sequence(true); 4939 symbol.get<DerivedTypeDetails>().set_isDECStructure(true); 4940 derivedTypeInfo_.type = &symbol; 4941 PushScope(Scope::Kind::DerivedType, &symbol); 4942 const auto &fields{std::get<std::list<parser::StructureField>>(def.t)}; 4943 Walk(fields); 4944 PopScope(); 4945 // Complete the definition 4946 DerivedTypeSpec derivedTypeSpec{symbol.name(), symbol}; 4947 derivedTypeSpec.set_scope(DEREF(symbol.scope())); 4948 derivedTypeSpec.CookParameters(GetFoldingContext()); 4949 derivedTypeSpec.EvaluateParameters(context()); 4950 DeclTypeSpec &type{currScope().MakeDerivedType( 4951 DeclTypeSpec::TypeDerived, std::move(derivedTypeSpec))}; 4952 type.derivedTypeSpec().Instantiate(currScope()); 4953 // Restore previous structure definition context, if any 4954 derivedTypeInfo_ = saveDerivedTypeInfo; 4955 if (previousStructure) { 4956 PushScope(*previousStructure); 4957 } 4958 // Handle any entity declarations on the STRUCTURE statement 4959 const auto &decls{std::get<std::list<parser::EntityDecl>>(structStmt.t)}; 4960 if (!decls.empty()) { 4961 BeginDecl(); 4962 SetDeclTypeSpec(type); 4963 Walk(decls); 4964 EndDecl(); 4965 } 4966 return false; 4967 } 4968 4969 bool DeclarationVisitor::Pre(const parser::Union::UnionStmt &) { 4970 Say("support for UNION"_todo_en_US); // TODO 4971 return true; 4972 } 4973 4974 bool DeclarationVisitor::Pre(const parser::StructureField &x) { 4975 if (std::holds_alternative<parser::Statement<parser::DataComponentDefStmt>>( 4976 x.u)) { 4977 BeginDecl(); 4978 } 4979 return true; 4980 } 4981 4982 void DeclarationVisitor::Post(const parser::StructureField &x) { 4983 if (std::holds_alternative<parser::Statement<parser::DataComponentDefStmt>>( 4984 x.u)) { 4985 EndDecl(); 4986 } 4987 } 4988 4989 bool DeclarationVisitor::Pre(const parser::AllocateStmt &) { 4990 BeginDeclTypeSpec(); 4991 return true; 4992 } 4993 void DeclarationVisitor::Post(const parser::AllocateStmt &) { 4994 EndDeclTypeSpec(); 4995 } 4996 4997 bool DeclarationVisitor::Pre(const parser::StructureConstructor &x) { 4998 auto &parsedType{std::get<parser::DerivedTypeSpec>(x.t)}; 4999 const DeclTypeSpec *type{ProcessTypeSpec(parsedType)}; 5000 if (!type) { 5001 return false; 5002 } 5003 const DerivedTypeSpec *spec{type->AsDerived()}; 5004 const Scope *typeScope{spec ? spec->scope() : nullptr}; 5005 if (!typeScope) { 5006 return false; 5007 } 5008 5009 // N.B C7102 is implicitly enforced by having inaccessible types not 5010 // being found in resolution. 5011 // More constraints are enforced in expression.cpp so that they 5012 // can apply to structure constructors that have been converted 5013 // from misparsed function references. 5014 for (const auto &component : 5015 std::get<std::list<parser::ComponentSpec>>(x.t)) { 5016 // Visit the component spec expression, but not the keyword, since 5017 // we need to resolve its symbol in the scope of the derived type. 5018 Walk(std::get<parser::ComponentDataSource>(component.t)); 5019 if (const auto &kw{std::get<std::optional<parser::Keyword>>(component.t)}) { 5020 FindInTypeOrParents(*typeScope, kw->v); 5021 } 5022 } 5023 return false; 5024 } 5025 5026 bool DeclarationVisitor::Pre(const parser::BasedPointerStmt &x) { 5027 for (const parser::BasedPointer &bp : x.v) { 5028 const parser::ObjectName &pointerName{std::get<0>(bp.t)}; 5029 const parser::ObjectName &pointeeName{std::get<1>(bp.t)}; 5030 auto *pointer{FindSymbol(pointerName)}; 5031 if (!pointer) { 5032 pointer = &MakeSymbol(pointerName, ObjectEntityDetails{}); 5033 } else if (!ConvertToObjectEntity(*pointer) || IsNamedConstant(*pointer)) { 5034 SayWithDecl(pointerName, *pointer, "'%s' is not a variable"_err_en_US); 5035 } else if (pointer->Rank() > 0) { 5036 SayWithDecl(pointerName, *pointer, 5037 "Cray pointer '%s' must be a scalar"_err_en_US); 5038 } else if (pointer->test(Symbol::Flag::CrayPointee)) { 5039 Say(pointerName, 5040 "'%s' cannot be a Cray pointer as it is already a Cray pointee"_err_en_US); 5041 } 5042 pointer->set(Symbol::Flag::CrayPointer); 5043 const DeclTypeSpec &pointerType{MakeNumericType(TypeCategory::Integer, 5044 context().defaultKinds().subscriptIntegerKind())}; 5045 const auto *type{pointer->GetType()}; 5046 if (!type) { 5047 pointer->SetType(pointerType); 5048 } else if (*type != pointerType) { 5049 Say(pointerName.source, "Cray pointer '%s' must have type %s"_err_en_US, 5050 pointerName.source, pointerType.AsFortran()); 5051 } 5052 if (ResolveName(pointeeName)) { 5053 Symbol &pointee{*pointeeName.symbol}; 5054 if (pointee.has<UseDetails>()) { 5055 Say(pointeeName, 5056 "'%s' cannot be a Cray pointee as it is use-associated"_err_en_US); 5057 continue; 5058 } else if (!ConvertToObjectEntity(pointee) || IsNamedConstant(pointee)) { 5059 Say(pointeeName, "'%s' is not a variable"_err_en_US); 5060 continue; 5061 } else if (pointee.test(Symbol::Flag::CrayPointer)) { 5062 Say(pointeeName, 5063 "'%s' cannot be a Cray pointee as it is already a Cray pointer"_err_en_US); 5064 } else if (pointee.test(Symbol::Flag::CrayPointee)) { 5065 Say(pointeeName, 5066 "'%s' was already declared as a Cray pointee"_err_en_US); 5067 } else { 5068 pointee.set(Symbol::Flag::CrayPointee); 5069 } 5070 if (const auto *pointeeType{pointee.GetType()}) { 5071 if (const auto *derived{pointeeType->AsDerived()}) { 5072 if (!derived->typeSymbol().get<DerivedTypeDetails>().sequence()) { 5073 Say(pointeeName, 5074 "Type of Cray pointee '%s' is a non-sequence derived type"_err_en_US); 5075 } 5076 } 5077 } 5078 // process the pointee array-spec, if present 5079 BeginArraySpec(); 5080 Walk(std::get<std::optional<parser::ArraySpec>>(bp.t)); 5081 const auto &spec{arraySpec()}; 5082 if (!spec.empty()) { 5083 auto &details{pointee.get<ObjectEntityDetails>()}; 5084 if (details.shape().empty()) { 5085 details.set_shape(spec); 5086 } else { 5087 SayWithDecl(pointeeName, pointee, 5088 "Array spec was already declared for '%s'"_err_en_US); 5089 } 5090 } 5091 ClearArraySpec(); 5092 currScope().add_crayPointer(pointeeName.source, *pointer); 5093 } 5094 } 5095 return false; 5096 } 5097 5098 bool DeclarationVisitor::Pre(const parser::NamelistStmt::Group &x) { 5099 if (!CheckNotInBlock("NAMELIST")) { // C1107 5100 return false; 5101 } 5102 const auto &groupName{std::get<parser::Name>(x.t)}; 5103 auto *groupSymbol{FindInScope(groupName)}; 5104 if (!groupSymbol || !groupSymbol->has<NamelistDetails>()) { 5105 groupSymbol = &MakeSymbol(groupName, NamelistDetails{}); 5106 groupSymbol->ReplaceName(groupName.source); 5107 } 5108 // Name resolution of group items is deferred to FinishNamelists() 5109 // so that host association is handled correctly. 5110 GetDeferredDeclarationState(true)->namelistGroups.emplace_back(&x); 5111 return false; 5112 } 5113 5114 void DeclarationVisitor::FinishNamelists() { 5115 if (auto *deferred{GetDeferredDeclarationState()}) { 5116 for (const parser::NamelistStmt::Group *group : deferred->namelistGroups) { 5117 if (auto *groupSymbol{FindInScope(std::get<parser::Name>(group->t))}) { 5118 if (auto *details{groupSymbol->detailsIf<NamelistDetails>()}) { 5119 for (const auto &name : std::get<std::list<parser::Name>>(group->t)) { 5120 auto *symbol{FindSymbol(name)}; 5121 if (!symbol) { 5122 symbol = &MakeSymbol(name, ObjectEntityDetails{}); 5123 ApplyImplicitRules(*symbol); 5124 } else if (!ConvertToObjectEntity(*symbol)) { 5125 SayWithDecl(name, *symbol, "'%s' is not a variable"_err_en_US); 5126 } 5127 symbol->GetUltimate().set(Symbol::Flag::InNamelist); 5128 details->add_object(*symbol); 5129 } 5130 } 5131 } 5132 } 5133 deferred->namelistGroups.clear(); 5134 } 5135 } 5136 5137 bool DeclarationVisitor::Pre(const parser::IoControlSpec &x) { 5138 if (const auto *name{std::get_if<parser::Name>(&x.u)}) { 5139 auto *symbol{FindSymbol(*name)}; 5140 if (!symbol) { 5141 Say(*name, "Namelist group '%s' not found"_err_en_US); 5142 } else if (!symbol->GetUltimate().has<NamelistDetails>()) { 5143 SayWithDecl( 5144 *name, *symbol, "'%s' is not the name of a namelist group"_err_en_US); 5145 } 5146 } 5147 return true; 5148 } 5149 5150 bool DeclarationVisitor::Pre(const parser::CommonStmt::Block &x) { 5151 CheckNotInBlock("COMMON"); // C1107 5152 return true; 5153 } 5154 5155 bool DeclarationVisitor::Pre(const parser::CommonBlockObject &) { 5156 BeginArraySpec(); 5157 return true; 5158 } 5159 5160 void DeclarationVisitor::Post(const parser::CommonBlockObject &x) { 5161 const auto &name{std::get<parser::Name>(x.t)}; 5162 DeclareObjectEntity(name); 5163 auto pair{specPartState_.commonBlockObjects.insert(name.source)}; 5164 if (!pair.second) { 5165 const SourceName &prev{*pair.first}; 5166 Say2(name.source, "'%s' is already in a COMMON block"_err_en_US, prev, 5167 "Previous occurrence of '%s' in a COMMON block"_en_US); 5168 } 5169 } 5170 5171 bool DeclarationVisitor::Pre(const parser::EquivalenceStmt &x) { 5172 // save equivalence sets to be processed after specification part 5173 if (CheckNotInBlock("EQUIVALENCE")) { // C1107 5174 for (const std::list<parser::EquivalenceObject> &set : x.v) { 5175 specPartState_.equivalenceSets.push_back(&set); 5176 } 5177 } 5178 return false; // don't implicitly declare names yet 5179 } 5180 5181 void DeclarationVisitor::CheckEquivalenceSets() { 5182 EquivalenceSets equivSets{context()}; 5183 inEquivalenceStmt_ = true; 5184 for (const auto *set : specPartState_.equivalenceSets) { 5185 const auto &source{set->front().v.value().source}; 5186 if (set->size() <= 1) { // R871 5187 Say(source, "Equivalence set must have more than one object"_err_en_US); 5188 } 5189 for (const parser::EquivalenceObject &object : *set) { 5190 const auto &designator{object.v.value()}; 5191 // The designator was not resolved when it was encountered so do it now. 5192 // AnalyzeExpr causes array sections to be changed to substrings as needed 5193 Walk(designator); 5194 if (AnalyzeExpr(context(), designator)) { 5195 equivSets.AddToSet(designator); 5196 } 5197 } 5198 equivSets.FinishSet(source); 5199 } 5200 inEquivalenceStmt_ = false; 5201 for (auto &set : equivSets.sets()) { 5202 if (!set.empty()) { 5203 currScope().add_equivalenceSet(std::move(set)); 5204 } 5205 } 5206 specPartState_.equivalenceSets.clear(); 5207 } 5208 5209 bool DeclarationVisitor::Pre(const parser::SaveStmt &x) { 5210 if (x.v.empty()) { 5211 specPartState_.saveInfo.saveAll = currStmtSource(); 5212 currScope().set_hasSAVE(); 5213 } else { 5214 for (const parser::SavedEntity &y : x.v) { 5215 auto kind{std::get<parser::SavedEntity::Kind>(y.t)}; 5216 const auto &name{std::get<parser::Name>(y.t)}; 5217 if (kind == parser::SavedEntity::Kind::Common) { 5218 MakeCommonBlockSymbol(name); 5219 AddSaveName(specPartState_.saveInfo.commons, name.source); 5220 } else { 5221 HandleAttributeStmt(Attr::SAVE, name); 5222 } 5223 } 5224 } 5225 return false; 5226 } 5227 5228 void DeclarationVisitor::CheckSaveStmts() { 5229 for (const SourceName &name : specPartState_.saveInfo.entities) { 5230 auto *symbol{FindInScope(name)}; 5231 if (!symbol) { 5232 // error was reported 5233 } else if (specPartState_.saveInfo.saveAll) { 5234 // C889 - note that pgi, ifort, xlf do not enforce this constraint 5235 Say2(name, 5236 "Explicit SAVE of '%s' is redundant due to global SAVE statement"_err_en_US, 5237 *specPartState_.saveInfo.saveAll, "Global SAVE statement"_en_US); 5238 } else if (auto msg{CheckSaveAttr(*symbol)}) { 5239 Say(name, std::move(*msg)); 5240 context().SetError(*symbol); 5241 } else { 5242 SetSaveAttr(*symbol); 5243 } 5244 } 5245 for (const SourceName &name : specPartState_.saveInfo.commons) { 5246 if (auto *symbol{currScope().FindCommonBlock(name)}) { 5247 auto &objects{symbol->get<CommonBlockDetails>().objects()}; 5248 if (objects.empty()) { 5249 if (currScope().kind() != Scope::Kind::Block) { 5250 Say(name, 5251 "'%s' appears as a COMMON block in a SAVE statement but not in" 5252 " a COMMON statement"_err_en_US); 5253 } else { // C1108 5254 Say(name, 5255 "SAVE statement in BLOCK construct may not contain a" 5256 " common block name '%s'"_err_en_US); 5257 } 5258 } else { 5259 for (auto &object : symbol->get<CommonBlockDetails>().objects()) { 5260 SetSaveAttr(*object); 5261 } 5262 } 5263 } 5264 } 5265 if (specPartState_.saveInfo.saveAll) { 5266 // Apply SAVE attribute to applicable symbols 5267 for (auto pair : currScope()) { 5268 auto &symbol{*pair.second}; 5269 if (!CheckSaveAttr(symbol)) { 5270 SetSaveAttr(symbol); 5271 } 5272 } 5273 } 5274 specPartState_.saveInfo = {}; 5275 } 5276 5277 // If SAVE attribute can't be set on symbol, return error message. 5278 std::optional<MessageFixedText> DeclarationVisitor::CheckSaveAttr( 5279 const Symbol &symbol) { 5280 if (IsDummy(symbol)) { 5281 return "SAVE attribute may not be applied to dummy argument '%s'"_err_en_US; 5282 } else if (symbol.IsFuncResult()) { 5283 return "SAVE attribute may not be applied to function result '%s'"_err_en_US; 5284 } else if (symbol.has<ProcEntityDetails>() && 5285 !symbol.attrs().test(Attr::POINTER)) { 5286 return "Procedure '%s' with SAVE attribute must also have POINTER attribute"_err_en_US; 5287 } else if (IsAutomatic(symbol)) { 5288 return "SAVE attribute may not be applied to automatic data object '%s'"_err_en_US; 5289 } else { 5290 return std::nullopt; 5291 } 5292 } 5293 5294 // Record SAVEd names in specPartState_.saveInfo.entities. 5295 Attrs DeclarationVisitor::HandleSaveName(const SourceName &name, Attrs attrs) { 5296 if (attrs.test(Attr::SAVE)) { 5297 AddSaveName(specPartState_.saveInfo.entities, name); 5298 } 5299 return attrs; 5300 } 5301 5302 // Record a name in a set of those to be saved. 5303 void DeclarationVisitor::AddSaveName( 5304 std::set<SourceName> &set, const SourceName &name) { 5305 auto pair{set.insert(name)}; 5306 if (!pair.second) { 5307 Say2(name, "SAVE attribute was already specified on '%s'"_warn_en_US, 5308 *pair.first, "Previous specification of SAVE attribute"_en_US); 5309 } 5310 } 5311 5312 // Set the SAVE attribute on symbol unless it is implicitly saved anyway. 5313 void DeclarationVisitor::SetSaveAttr(Symbol &symbol) { 5314 if (!IsSaved(symbol)) { 5315 symbol.attrs().set(Attr::SAVE); 5316 } 5317 } 5318 5319 // Check types of common block objects, now that they are known. 5320 void DeclarationVisitor::CheckCommonBlocks() { 5321 // check for empty common blocks 5322 for (const auto &pair : currScope().commonBlocks()) { 5323 const auto &symbol{*pair.second}; 5324 if (symbol.get<CommonBlockDetails>().objects().empty() && 5325 symbol.attrs().test(Attr::BIND_C)) { 5326 Say(symbol.name(), 5327 "'%s' appears as a COMMON block in a BIND statement but not in" 5328 " a COMMON statement"_err_en_US); 5329 } 5330 } 5331 // check objects in common blocks 5332 for (const auto &name : specPartState_.commonBlockObjects) { 5333 const auto *symbol{currScope().FindSymbol(name)}; 5334 if (!symbol) { 5335 continue; 5336 } 5337 const auto &attrs{symbol->attrs()}; 5338 if (attrs.test(Attr::ALLOCATABLE)) { 5339 Say(name, 5340 "ALLOCATABLE object '%s' may not appear in a COMMON block"_err_en_US); 5341 } else if (attrs.test(Attr::BIND_C)) { 5342 Say(name, 5343 "Variable '%s' with BIND attribute may not appear in a COMMON block"_err_en_US); 5344 } else if (IsDummy(*symbol)) { 5345 Say(name, 5346 "Dummy argument '%s' may not appear in a COMMON block"_err_en_US); 5347 } else if (symbol->IsFuncResult()) { 5348 Say(name, 5349 "Function result '%s' may not appear in a COMMON block"_err_en_US); 5350 } else if (const DeclTypeSpec * type{symbol->GetType()}) { 5351 if (type->category() == DeclTypeSpec::ClassStar) { 5352 Say(name, 5353 "Unlimited polymorphic pointer '%s' may not appear in a COMMON block"_err_en_US); 5354 } else if (const auto *derived{type->AsDerived()}) { 5355 auto &typeSymbol{derived->typeSymbol()}; 5356 if (!typeSymbol.attrs().test(Attr::BIND_C) && 5357 !typeSymbol.get<DerivedTypeDetails>().sequence()) { 5358 Say(name, 5359 "Derived type '%s' in COMMON block must have the BIND or" 5360 " SEQUENCE attribute"_err_en_US); 5361 } 5362 CheckCommonBlockDerivedType(name, typeSymbol); 5363 } 5364 } 5365 } 5366 specPartState_.commonBlockObjects = {}; 5367 } 5368 5369 Symbol &DeclarationVisitor::MakeCommonBlockSymbol(const parser::Name &name) { 5370 return Resolve(name, currScope().MakeCommonBlock(name.source)); 5371 } 5372 Symbol &DeclarationVisitor::MakeCommonBlockSymbol( 5373 const std::optional<parser::Name> &name) { 5374 if (name) { 5375 return MakeCommonBlockSymbol(*name); 5376 } else { 5377 return MakeCommonBlockSymbol(parser::Name{}); 5378 } 5379 } 5380 5381 bool DeclarationVisitor::NameIsKnownOrIntrinsic(const parser::Name &name) { 5382 return FindSymbol(name) || HandleUnrestrictedSpecificIntrinsicFunction(name); 5383 } 5384 5385 // Check if this derived type can be in a COMMON block. 5386 void DeclarationVisitor::CheckCommonBlockDerivedType( 5387 const SourceName &name, const Symbol &typeSymbol) { 5388 if (const auto *scope{typeSymbol.scope()}) { 5389 for (const auto &pair : *scope) { 5390 const Symbol &component{*pair.second}; 5391 if (component.attrs().test(Attr::ALLOCATABLE)) { 5392 Say2(name, 5393 "Derived type variable '%s' may not appear in a COMMON block" 5394 " due to ALLOCATABLE component"_err_en_US, 5395 component.name(), "Component with ALLOCATABLE attribute"_en_US); 5396 return; 5397 } 5398 const auto *details{component.detailsIf<ObjectEntityDetails>()}; 5399 if (component.test(Symbol::Flag::InDataStmt) || 5400 (details && details->init())) { 5401 Say2(name, 5402 "Derived type variable '%s' may not appear in a COMMON block due to component with default initialization"_err_en_US, 5403 component.name(), "Component with default initialization"_en_US); 5404 return; 5405 } 5406 if (details) { 5407 if (const auto *type{details->type()}) { 5408 if (const auto *derived{type->AsDerived()}) { 5409 CheckCommonBlockDerivedType(name, derived->typeSymbol()); 5410 } 5411 } 5412 } 5413 } 5414 } 5415 } 5416 5417 bool DeclarationVisitor::HandleUnrestrictedSpecificIntrinsicFunction( 5418 const parser::Name &name) { 5419 if (auto interface{context().intrinsics().IsSpecificIntrinsicFunction( 5420 name.source.ToString())}) { 5421 // Unrestricted specific intrinsic function names (e.g., "cos") 5422 // are acceptable as procedure interfaces. The presence of the 5423 // INTRINSIC flag will cause this symbol to have a complete interface 5424 // recreated for it later on demand, but capturing its result type here 5425 // will make GetType() return a correct result without having to 5426 // probe the intrinsics table again. 5427 Symbol &symbol{ 5428 MakeSymbol(InclusiveScope(), name.source, Attrs{Attr::INTRINSIC})}; 5429 CHECK(interface->functionResult.has_value()); 5430 evaluate::DynamicType dyType{ 5431 DEREF(interface->functionResult->GetTypeAndShape()).type()}; 5432 CHECK(common::IsNumericTypeCategory(dyType.category())); 5433 const DeclTypeSpec &typeSpec{ 5434 MakeNumericType(dyType.category(), dyType.kind())}; 5435 ProcEntityDetails details; 5436 ProcInterface procInterface; 5437 procInterface.set_type(typeSpec); 5438 details.set_interface(procInterface); 5439 symbol.set_details(std::move(details)); 5440 symbol.set(Symbol::Flag::Function); 5441 if (interface->IsElemental()) { 5442 symbol.attrs().set(Attr::ELEMENTAL); 5443 } 5444 if (interface->IsPure()) { 5445 symbol.attrs().set(Attr::PURE); 5446 } 5447 Resolve(name, symbol); 5448 return true; 5449 } else { 5450 return false; 5451 } 5452 } 5453 5454 // Checks for all locality-specs: LOCAL, LOCAL_INIT, and SHARED 5455 bool DeclarationVisitor::PassesSharedLocalityChecks( 5456 const parser::Name &name, Symbol &symbol) { 5457 if (!IsVariableName(symbol)) { 5458 SayLocalMustBeVariable(name, symbol); // C1124 5459 return false; 5460 } 5461 if (symbol.owner() == currScope()) { // C1125 and C1126 5462 SayAlreadyDeclared(name, symbol); 5463 return false; 5464 } 5465 return true; 5466 } 5467 5468 // Checks for locality-specs LOCAL and LOCAL_INIT 5469 bool DeclarationVisitor::PassesLocalityChecks( 5470 const parser::Name &name, Symbol &symbol) { 5471 if (IsAllocatable(symbol)) { // C1128 5472 SayWithDecl(name, symbol, 5473 "ALLOCATABLE variable '%s' not allowed in a locality-spec"_err_en_US); 5474 return false; 5475 } 5476 if (IsOptional(symbol)) { // C1128 5477 SayWithDecl(name, symbol, 5478 "OPTIONAL argument '%s' not allowed in a locality-spec"_err_en_US); 5479 return false; 5480 } 5481 if (IsIntentIn(symbol)) { // C1128 5482 SayWithDecl(name, symbol, 5483 "INTENT IN argument '%s' not allowed in a locality-spec"_err_en_US); 5484 return false; 5485 } 5486 if (IsFinalizable(symbol)) { // C1128 5487 SayWithDecl(name, symbol, 5488 "Finalizable variable '%s' not allowed in a locality-spec"_err_en_US); 5489 return false; 5490 } 5491 if (evaluate::IsCoarray(symbol)) { // C1128 5492 SayWithDecl( 5493 name, symbol, "Coarray '%s' not allowed in a locality-spec"_err_en_US); 5494 return false; 5495 } 5496 if (const DeclTypeSpec * type{symbol.GetType()}) { 5497 if (type->IsPolymorphic() && IsDummy(symbol) && 5498 !IsPointer(symbol)) { // C1128 5499 SayWithDecl(name, symbol, 5500 "Nonpointer polymorphic argument '%s' not allowed in a " 5501 "locality-spec"_err_en_US); 5502 return false; 5503 } 5504 } 5505 if (IsAssumedSizeArray(symbol)) { // C1128 5506 SayWithDecl(name, symbol, 5507 "Assumed size array '%s' not allowed in a locality-spec"_err_en_US); 5508 return false; 5509 } 5510 if (std::optional<Message> msg{WhyNotModifiable(symbol, currScope())}) { 5511 SayWithReason(name, symbol, 5512 "'%s' may not appear in a locality-spec because it is not " 5513 "definable"_err_en_US, 5514 std::move(*msg)); 5515 return false; 5516 } 5517 return PassesSharedLocalityChecks(name, symbol); 5518 } 5519 5520 Symbol &DeclarationVisitor::FindOrDeclareEnclosingEntity( 5521 const parser::Name &name) { 5522 Symbol *prev{FindSymbol(name)}; 5523 if (!prev) { 5524 // Declare the name as an object in the enclosing scope so that 5525 // the name can't be repurposed there later as something else. 5526 prev = &MakeSymbol(InclusiveScope(), name.source, Attrs{}); 5527 ConvertToObjectEntity(*prev); 5528 ApplyImplicitRules(*prev); 5529 } 5530 return *prev; 5531 } 5532 5533 Symbol *DeclarationVisitor::DeclareLocalEntity(const parser::Name &name) { 5534 Symbol &prev{FindOrDeclareEnclosingEntity(name)}; 5535 if (!PassesLocalityChecks(name, prev)) { 5536 return nullptr; 5537 } 5538 return &MakeHostAssocSymbol(name, prev); 5539 } 5540 5541 Symbol *DeclarationVisitor::DeclareStatementEntity( 5542 const parser::DoVariable &doVar, 5543 const std::optional<parser::IntegerTypeSpec> &type) { 5544 const parser::Name &name{doVar.thing.thing}; 5545 const DeclTypeSpec *declTypeSpec{nullptr}; 5546 if (auto *prev{FindSymbol(name)}) { 5547 if (prev->owner() == currScope()) { 5548 SayAlreadyDeclared(name, *prev); 5549 return nullptr; 5550 } 5551 name.symbol = nullptr; 5552 declTypeSpec = prev->GetType(); 5553 } 5554 Symbol &symbol{DeclareEntity<ObjectEntityDetails>(name, {})}; 5555 if (!symbol.has<ObjectEntityDetails>()) { 5556 return nullptr; // error was reported in DeclareEntity 5557 } 5558 if (type) { 5559 declTypeSpec = ProcessTypeSpec(*type); 5560 } 5561 if (declTypeSpec) { 5562 // Subtlety: Don't let a "*length" specifier (if any is pending) affect the 5563 // declaration of this implied DO loop control variable. 5564 auto restorer{ 5565 common::ScopedSet(charInfo_.length, std::optional<ParamValue>{})}; 5566 SetType(name, *declTypeSpec); 5567 } else { 5568 ApplyImplicitRules(symbol); 5569 } 5570 Symbol *result{Resolve(name, &symbol)}; 5571 AnalyzeExpr(context(), doVar); // enforce INTEGER type 5572 return result; 5573 } 5574 5575 // Set the type of an entity or report an error. 5576 void DeclarationVisitor::SetType( 5577 const parser::Name &name, const DeclTypeSpec &type) { 5578 CHECK(name.symbol); 5579 auto &symbol{*name.symbol}; 5580 if (charInfo_.length) { // Declaration has "*length" (R723) 5581 auto length{std::move(*charInfo_.length)}; 5582 charInfo_.length.reset(); 5583 if (type.category() == DeclTypeSpec::Character) { 5584 auto kind{type.characterTypeSpec().kind()}; 5585 // Recurse with correct type. 5586 SetType(name, 5587 currScope().MakeCharacterType(std::move(length), std::move(kind))); 5588 return; 5589 } else { // C753 5590 Say(name, 5591 "A length specifier cannot be used to declare the non-character entity '%s'"_err_en_US); 5592 } 5593 } 5594 auto *prevType{symbol.GetType()}; 5595 if (!prevType) { 5596 symbol.SetType(type); 5597 } else if (symbol.has<UseDetails>()) { 5598 // error recovery case, redeclaration of use-associated name 5599 } else if (HadForwardRef(symbol)) { 5600 // error recovery after use of host-associated name 5601 } else if (!symbol.test(Symbol::Flag::Implicit)) { 5602 SayWithDecl( 5603 name, symbol, "The type of '%s' has already been declared"_err_en_US); 5604 context().SetError(symbol); 5605 } else if (type != *prevType) { 5606 SayWithDecl(name, symbol, 5607 "The type of '%s' has already been implicitly declared"_err_en_US); 5608 context().SetError(symbol); 5609 } else { 5610 symbol.set(Symbol::Flag::Implicit, false); 5611 } 5612 } 5613 5614 std::optional<DerivedTypeSpec> DeclarationVisitor::ResolveDerivedType( 5615 const parser::Name &name) { 5616 Scope &outer{NonDerivedTypeScope()}; 5617 Symbol *symbol{FindSymbol(outer, name)}; 5618 Symbol *ultimate{symbol ? &symbol->GetUltimate() : nullptr}; 5619 auto *generic{ultimate ? ultimate->detailsIf<GenericDetails>() : nullptr}; 5620 if (generic) { 5621 if (Symbol * genDT{generic->derivedType()}) { 5622 symbol = genDT; 5623 generic = nullptr; 5624 } 5625 } 5626 if (!symbol || symbol->has<UnknownDetails>() || 5627 (generic && &ultimate->owner() == &outer)) { 5628 if (allowForwardReferenceToDerivedType()) { 5629 if (!symbol) { 5630 symbol = &MakeSymbol(outer, name.source, Attrs{}); 5631 Resolve(name, *symbol); 5632 } else if (generic) { 5633 // forward ref to type with later homonymous generic 5634 symbol = &outer.MakeSymbol(name.source, Attrs{}, UnknownDetails{}); 5635 generic->set_derivedType(*symbol); 5636 name.symbol = symbol; 5637 } 5638 DerivedTypeDetails details; 5639 details.set_isForwardReferenced(true); 5640 symbol->set_details(std::move(details)); 5641 } else { // C732 5642 Say(name, "Derived type '%s' not found"_err_en_US); 5643 return std::nullopt; 5644 } 5645 } 5646 if (CheckUseError(name)) { 5647 return std::nullopt; 5648 } 5649 symbol = &symbol->GetUltimate(); 5650 if (symbol->has<DerivedTypeDetails>()) { 5651 return DerivedTypeSpec{name.source, *symbol}; 5652 } else { 5653 Say(name, "'%s' is not a derived type"_err_en_US); 5654 return std::nullopt; 5655 } 5656 } 5657 5658 std::optional<DerivedTypeSpec> DeclarationVisitor::ResolveExtendsType( 5659 const parser::Name &typeName, const parser::Name *extendsName) { 5660 if (!extendsName) { 5661 return std::nullopt; 5662 } else if (typeName.source == extendsName->source) { 5663 Say(extendsName->source, 5664 "Derived type '%s' cannot extend itself"_err_en_US); 5665 return std::nullopt; 5666 } else { 5667 return ResolveDerivedType(*extendsName); 5668 } 5669 } 5670 5671 Symbol *DeclarationVisitor::NoteInterfaceName(const parser::Name &name) { 5672 // The symbol is checked later by CheckExplicitInterface() and 5673 // CheckBindings(). It can be a forward reference. 5674 if (!NameIsKnownOrIntrinsic(name)) { 5675 Symbol &symbol{MakeSymbol(InclusiveScope(), name.source, Attrs{})}; 5676 Resolve(name, symbol); 5677 } 5678 return name.symbol; 5679 } 5680 5681 void DeclarationVisitor::CheckExplicitInterface(const parser::Name &name) { 5682 if (const Symbol * symbol{name.symbol}) { 5683 if (!context().HasError(*symbol) && !symbol->HasExplicitInterface()) { 5684 Say(name, 5685 "'%s' must be an abstract interface or a procedure with " 5686 "an explicit interface"_err_en_US, 5687 symbol->name()); 5688 } 5689 } 5690 } 5691 5692 // Create a symbol for a type parameter, component, or procedure binding in 5693 // the current derived type scope. Return false on error. 5694 Symbol *DeclarationVisitor::MakeTypeSymbol( 5695 const parser::Name &name, Details &&details) { 5696 return Resolve(name, MakeTypeSymbol(name.source, std::move(details))); 5697 } 5698 Symbol *DeclarationVisitor::MakeTypeSymbol( 5699 const SourceName &name, Details &&details) { 5700 Scope &derivedType{currScope()}; 5701 CHECK(derivedType.IsDerivedType()); 5702 if (auto *symbol{FindInScope(derivedType, name)}) { // C742 5703 Say2(name, 5704 "Type parameter, component, or procedure binding '%s'" 5705 " already defined in this type"_err_en_US, 5706 *symbol, "Previous definition of '%s'"_en_US); 5707 return nullptr; 5708 } else { 5709 auto attrs{GetAttrs()}; 5710 // Apply binding-private-stmt if present and this is a procedure binding 5711 if (derivedTypeInfo_.privateBindings && 5712 !attrs.HasAny({Attr::PUBLIC, Attr::PRIVATE}) && 5713 std::holds_alternative<ProcBindingDetails>(details)) { 5714 attrs.set(Attr::PRIVATE); 5715 } 5716 Symbol &result{MakeSymbol(name, attrs, std::move(details))}; 5717 if (result.has<TypeParamDetails>()) { 5718 derivedType.symbol()->get<DerivedTypeDetails>().add_paramDecl(result); 5719 } 5720 return &result; 5721 } 5722 } 5723 5724 // Return true if it is ok to declare this component in the current scope. 5725 // Otherwise, emit an error and return false. 5726 bool DeclarationVisitor::OkToAddComponent( 5727 const parser::Name &name, const Symbol *extends) { 5728 for (const Scope *scope{&currScope()}; scope;) { 5729 CHECK(scope->IsDerivedType()); 5730 if (auto *prev{FindInScope(*scope, name)}) { 5731 if (!context().HasError(*prev)) { 5732 parser::MessageFixedText msg; 5733 if (extends) { 5734 msg = "Type cannot be extended as it has a component named" 5735 " '%s'"_err_en_US; 5736 } else if (prev->test(Symbol::Flag::ParentComp)) { 5737 msg = "'%s' is a parent type of this type and so cannot be" 5738 " a component"_err_en_US; 5739 } else if (scope != &currScope()) { 5740 msg = "Component '%s' is already declared in a parent of this" 5741 " derived type"_err_en_US; 5742 } else { 5743 msg = "Component '%s' is already declared in this" 5744 " derived type"_err_en_US; 5745 } 5746 Say2(name, std::move(msg), *prev, "Previous declaration of '%s'"_en_US); 5747 } 5748 return false; 5749 } 5750 if (scope == &currScope() && extends) { 5751 // The parent component has not yet been added to the scope. 5752 scope = extends->scope(); 5753 } else { 5754 scope = scope->GetDerivedTypeParent(); 5755 } 5756 } 5757 return true; 5758 } 5759 5760 ParamValue DeclarationVisitor::GetParamValue( 5761 const parser::TypeParamValue &x, common::TypeParamAttr attr) { 5762 return common::visit( 5763 common::visitors{ 5764 [=](const parser::ScalarIntExpr &x) { // C704 5765 return ParamValue{EvaluateIntExpr(x), attr}; 5766 }, 5767 [=](const parser::Star &) { return ParamValue::Assumed(attr); }, 5768 [=](const parser::TypeParamValue::Deferred &) { 5769 return ParamValue::Deferred(attr); 5770 }, 5771 }, 5772 x.u); 5773 } 5774 5775 // ConstructVisitor implementation 5776 5777 void ConstructVisitor::ResolveIndexName( 5778 const parser::ConcurrentControl &control) { 5779 const parser::Name &name{std::get<parser::Name>(control.t)}; 5780 auto *prev{FindSymbol(name)}; 5781 if (prev) { 5782 if (prev->owner().kind() == Scope::Kind::Forall || 5783 prev->owner() == currScope()) { 5784 SayAlreadyDeclared(name, *prev); 5785 return; 5786 } 5787 name.symbol = nullptr; 5788 } 5789 auto &symbol{DeclareObjectEntity(name)}; 5790 if (symbol.GetType()) { 5791 // type came from explicit type-spec 5792 } else if (!prev) { 5793 ApplyImplicitRules(symbol); 5794 } else { 5795 const Symbol &prevRoot{ResolveAssociations(*prev)}; 5796 // prev could be host- use- or construct-associated with another symbol 5797 if (!prevRoot.has<ObjectEntityDetails>() && 5798 !prevRoot.has<EntityDetails>()) { 5799 Say2(name, "Index name '%s' conflicts with existing identifier"_err_en_US, 5800 *prev, "Previous declaration of '%s'"_en_US); 5801 context().SetError(symbol); 5802 return; 5803 } else { 5804 if (const auto *type{prevRoot.GetType()}) { 5805 symbol.SetType(*type); 5806 } 5807 if (prevRoot.IsObjectArray()) { 5808 SayWithDecl(name, *prev, "Index variable '%s' is not scalar"_err_en_US); 5809 return; 5810 } 5811 } 5812 } 5813 EvaluateExpr(parser::Scalar{parser::Integer{common::Clone(name)}}); 5814 } 5815 5816 // We need to make sure that all of the index-names get declared before the 5817 // expressions in the loop control are evaluated so that references to the 5818 // index-names in the expressions are correctly detected. 5819 bool ConstructVisitor::Pre(const parser::ConcurrentHeader &header) { 5820 BeginDeclTypeSpec(); 5821 Walk(std::get<std::optional<parser::IntegerTypeSpec>>(header.t)); 5822 const auto &controls{ 5823 std::get<std::list<parser::ConcurrentControl>>(header.t)}; 5824 for (const auto &control : controls) { 5825 ResolveIndexName(control); 5826 } 5827 Walk(controls); 5828 Walk(std::get<std::optional<parser::ScalarLogicalExpr>>(header.t)); 5829 EndDeclTypeSpec(); 5830 return false; 5831 } 5832 5833 bool ConstructVisitor::Pre(const parser::LocalitySpec::Local &x) { 5834 for (auto &name : x.v) { 5835 if (auto *symbol{DeclareLocalEntity(name)}) { 5836 symbol->set(Symbol::Flag::LocalityLocal); 5837 } 5838 } 5839 return false; 5840 } 5841 5842 bool ConstructVisitor::Pre(const parser::LocalitySpec::LocalInit &x) { 5843 for (auto &name : x.v) { 5844 if (auto *symbol{DeclareLocalEntity(name)}) { 5845 symbol->set(Symbol::Flag::LocalityLocalInit); 5846 } 5847 } 5848 return false; 5849 } 5850 5851 bool ConstructVisitor::Pre(const parser::LocalitySpec::Shared &x) { 5852 for (const auto &name : x.v) { 5853 if (!FindSymbol(name)) { 5854 Say(name, 5855 "Variable '%s' with SHARED locality implicitly declared"_warn_en_US); 5856 } 5857 Symbol &prev{FindOrDeclareEnclosingEntity(name)}; 5858 if (PassesSharedLocalityChecks(name, prev)) { 5859 MakeHostAssocSymbol(name, prev).set(Symbol::Flag::LocalityShared); 5860 } 5861 } 5862 return false; 5863 } 5864 5865 bool ConstructVisitor::Pre(const parser::AcSpec &x) { 5866 ProcessTypeSpec(x.type); 5867 Walk(x.values); 5868 return false; 5869 } 5870 5871 // Section 19.4, paragraph 5 says that each ac-do-variable has the scope of the 5872 // enclosing ac-implied-do 5873 bool ConstructVisitor::Pre(const parser::AcImpliedDo &x) { 5874 auto &values{std::get<std::list<parser::AcValue>>(x.t)}; 5875 auto &control{std::get<parser::AcImpliedDoControl>(x.t)}; 5876 auto &type{std::get<std::optional<parser::IntegerTypeSpec>>(control.t)}; 5877 auto &bounds{std::get<parser::AcImpliedDoControl::Bounds>(control.t)}; 5878 // F'2018 has the scope of the implied DO variable covering the entire 5879 // implied DO production (19.4(5)), which seems wrong in cases where the name 5880 // of the implied DO variable appears in one of the bound expressions. Thus 5881 // this extension, which shrinks the scope of the variable to exclude the 5882 // expressions in the bounds. 5883 auto restore{BeginCheckOnIndexUseInOwnBounds(bounds.name)}; 5884 Walk(bounds.lower); 5885 Walk(bounds.upper); 5886 Walk(bounds.step); 5887 EndCheckOnIndexUseInOwnBounds(restore); 5888 PushScope(Scope::Kind::ImpliedDos, nullptr); 5889 DeclareStatementEntity(bounds.name, type); 5890 Walk(values); 5891 PopScope(); 5892 return false; 5893 } 5894 5895 bool ConstructVisitor::Pre(const parser::DataImpliedDo &x) { 5896 auto &objects{std::get<std::list<parser::DataIDoObject>>(x.t)}; 5897 auto &type{std::get<std::optional<parser::IntegerTypeSpec>>(x.t)}; 5898 auto &bounds{std::get<parser::DataImpliedDo::Bounds>(x.t)}; 5899 // See comment in Pre(AcImpliedDo) above. 5900 auto restore{BeginCheckOnIndexUseInOwnBounds(bounds.name)}; 5901 Walk(bounds.lower); 5902 Walk(bounds.upper); 5903 Walk(bounds.step); 5904 EndCheckOnIndexUseInOwnBounds(restore); 5905 bool pushScope{currScope().kind() != Scope::Kind::ImpliedDos}; 5906 if (pushScope) { 5907 PushScope(Scope::Kind::ImpliedDos, nullptr); 5908 } 5909 DeclareStatementEntity(bounds.name, type); 5910 Walk(objects); 5911 if (pushScope) { 5912 PopScope(); 5913 } 5914 return false; 5915 } 5916 5917 // Sets InDataStmt flag on a variable (or misidentified function) in a DATA 5918 // statement so that the predicate IsInitialized() will be true 5919 // during semantic analysis before the symbol's initializer is constructed. 5920 bool ConstructVisitor::Pre(const parser::DataIDoObject &x) { 5921 common::visit( 5922 common::visitors{ 5923 [&](const parser::Scalar<Indirection<parser::Designator>> &y) { 5924 Walk(y.thing.value()); 5925 const parser::Name &first{parser::GetFirstName(y.thing.value())}; 5926 if (first.symbol) { 5927 first.symbol->set(Symbol::Flag::InDataStmt); 5928 } 5929 }, 5930 [&](const Indirection<parser::DataImpliedDo> &y) { Walk(y.value()); }, 5931 }, 5932 x.u); 5933 return false; 5934 } 5935 5936 bool ConstructVisitor::Pre(const parser::DataStmtObject &x) { 5937 // Subtle: DATA statements may appear in both the specification and 5938 // execution parts, but should be treated as if in the execution part 5939 // for purposes of implicit variable declaration vs. host association. 5940 // When a name first appears as an object in a DATA statement, it should 5941 // be implicitly declared locally as if it had been assigned. 5942 auto flagRestorer{common::ScopedSet(inSpecificationPart_, false)}; 5943 common::visit(common::visitors{ 5944 [&](const Indirection<parser::Variable> &y) { 5945 Walk(y.value()); 5946 const parser::Name &first{ 5947 parser::GetFirstName(y.value())}; 5948 if (first.symbol) { 5949 first.symbol->set(Symbol::Flag::InDataStmt); 5950 } 5951 }, 5952 [&](const parser::DataImpliedDo &y) { 5953 PushScope(Scope::Kind::ImpliedDos, nullptr); 5954 Walk(y); 5955 PopScope(); 5956 }, 5957 }, 5958 x.u); 5959 return false; 5960 } 5961 5962 bool ConstructVisitor::Pre(const parser::DataStmtValue &x) { 5963 const auto &data{std::get<parser::DataStmtConstant>(x.t)}; 5964 auto &mutableData{const_cast<parser::DataStmtConstant &>(data)}; 5965 if (auto *elem{parser::Unwrap<parser::ArrayElement>(mutableData)}) { 5966 if (const auto *name{std::get_if<parser::Name>(&elem->base.u)}) { 5967 if (const Symbol * symbol{FindSymbol(*name)}) { 5968 const Symbol &ultimate{symbol->GetUltimate()}; 5969 if (ultimate.has<DerivedTypeDetails>()) { 5970 mutableData.u = elem->ConvertToStructureConstructor( 5971 DerivedTypeSpec{name->source, ultimate}); 5972 } 5973 } 5974 } 5975 } 5976 return true; 5977 } 5978 5979 bool ConstructVisitor::Pre(const parser::DoConstruct &x) { 5980 if (x.IsDoConcurrent()) { 5981 PushScope(Scope::Kind::Block, nullptr); 5982 } 5983 return true; 5984 } 5985 void ConstructVisitor::Post(const parser::DoConstruct &x) { 5986 if (x.IsDoConcurrent()) { 5987 PopScope(); 5988 } 5989 } 5990 5991 bool ConstructVisitor::Pre(const parser::ForallConstruct &) { 5992 PushScope(Scope::Kind::Forall, nullptr); 5993 return true; 5994 } 5995 void ConstructVisitor::Post(const parser::ForallConstruct &) { PopScope(); } 5996 bool ConstructVisitor::Pre(const parser::ForallStmt &) { 5997 PushScope(Scope::Kind::Forall, nullptr); 5998 return true; 5999 } 6000 void ConstructVisitor::Post(const parser::ForallStmt &) { PopScope(); } 6001 6002 bool ConstructVisitor::Pre(const parser::BlockStmt &x) { 6003 CheckDef(x.v); 6004 PushScope(Scope::Kind::Block, nullptr); 6005 return false; 6006 } 6007 bool ConstructVisitor::Pre(const parser::EndBlockStmt &x) { 6008 PopScope(); 6009 CheckRef(x.v); 6010 return false; 6011 } 6012 6013 void ConstructVisitor::Post(const parser::Selector &x) { 6014 GetCurrentAssociation().selector = ResolveSelector(x); 6015 } 6016 6017 void ConstructVisitor::Post(const parser::AssociateStmt &x) { 6018 CheckDef(x.t); 6019 PushScope(Scope::Kind::Block, nullptr); 6020 const auto assocCount{std::get<std::list<parser::Association>>(x.t).size()}; 6021 for (auto nthLastAssoc{assocCount}; nthLastAssoc > 0; --nthLastAssoc) { 6022 SetCurrentAssociation(nthLastAssoc); 6023 if (auto *symbol{MakeAssocEntity()}) { 6024 if (ExtractCoarrayRef(GetCurrentAssociation().selector.expr)) { // C1103 6025 Say("Selector must not be a coindexed object"_err_en_US); 6026 } 6027 SetTypeFromAssociation(*symbol); 6028 SetAttrsFromAssociation(*symbol); 6029 } 6030 } 6031 PopAssociation(assocCount); 6032 } 6033 6034 void ConstructVisitor::Post(const parser::EndAssociateStmt &x) { 6035 PopScope(); 6036 CheckRef(x.v); 6037 } 6038 6039 bool ConstructVisitor::Pre(const parser::Association &x) { 6040 PushAssociation(); 6041 const auto &name{std::get<parser::Name>(x.t)}; 6042 GetCurrentAssociation().name = &name; 6043 return true; 6044 } 6045 6046 bool ConstructVisitor::Pre(const parser::ChangeTeamStmt &x) { 6047 CheckDef(x.t); 6048 PushScope(Scope::Kind::Block, nullptr); 6049 PushAssociation(); 6050 return true; 6051 } 6052 6053 void ConstructVisitor::Post(const parser::CoarrayAssociation &x) { 6054 const auto &decl{std::get<parser::CodimensionDecl>(x.t)}; 6055 const auto &name{std::get<parser::Name>(decl.t)}; 6056 if (auto *symbol{FindInScope(name)}) { 6057 const auto &selector{std::get<parser::Selector>(x.t)}; 6058 if (auto sel{ResolveSelector(selector)}) { 6059 const Symbol *whole{UnwrapWholeSymbolDataRef(sel.expr)}; 6060 if (!whole || whole->Corank() == 0) { 6061 Say(sel.source, // C1116 6062 "Selector in coarray association must name a coarray"_err_en_US); 6063 } else if (auto dynType{sel.expr->GetType()}) { 6064 if (!symbol->GetType()) { 6065 symbol->SetType(ToDeclTypeSpec(std::move(*dynType))); 6066 } 6067 } 6068 } 6069 } 6070 } 6071 6072 void ConstructVisitor::Post(const parser::EndChangeTeamStmt &x) { 6073 PopAssociation(); 6074 PopScope(); 6075 CheckRef(x.t); 6076 } 6077 6078 bool ConstructVisitor::Pre(const parser::SelectTypeConstruct &) { 6079 PushAssociation(); 6080 return true; 6081 } 6082 6083 void ConstructVisitor::Post(const parser::SelectTypeConstruct &) { 6084 PopAssociation(); 6085 } 6086 6087 void ConstructVisitor::Post(const parser::SelectTypeStmt &x) { 6088 auto &association{GetCurrentAssociation()}; 6089 if (const std::optional<parser::Name> &name{std::get<1>(x.t)}) { 6090 // This isn't a name in the current scope, it is in each TypeGuardStmt 6091 MakePlaceholder(*name, MiscDetails::Kind::SelectTypeAssociateName); 6092 association.name = &*name; 6093 auto exprType{association.selector.expr->GetType()}; 6094 if (ExtractCoarrayRef(association.selector.expr)) { // C1103 6095 Say("Selector must not be a coindexed object"_err_en_US); 6096 } 6097 if (exprType && !exprType->IsPolymorphic()) { // C1159 6098 Say(association.selector.source, 6099 "Selector '%s' in SELECT TYPE statement must be " 6100 "polymorphic"_err_en_US); 6101 } 6102 } else { 6103 if (const Symbol * 6104 whole{UnwrapWholeSymbolDataRef(association.selector.expr)}) { 6105 ConvertToObjectEntity(const_cast<Symbol &>(*whole)); 6106 if (!IsVariableName(*whole)) { 6107 Say(association.selector.source, // C901 6108 "Selector is not a variable"_err_en_US); 6109 association = {}; 6110 } 6111 if (const DeclTypeSpec * type{whole->GetType()}) { 6112 if (!type->IsPolymorphic()) { // C1159 6113 Say(association.selector.source, 6114 "Selector '%s' in SELECT TYPE statement must be " 6115 "polymorphic"_err_en_US); 6116 } 6117 } 6118 } else { 6119 Say(association.selector.source, // C1157 6120 "Selector is not a named variable: 'associate-name =>' is required"_err_en_US); 6121 association = {}; 6122 } 6123 } 6124 } 6125 6126 void ConstructVisitor::Post(const parser::SelectRankStmt &x) { 6127 auto &association{GetCurrentAssociation()}; 6128 if (const std::optional<parser::Name> &name{std::get<1>(x.t)}) { 6129 // This isn't a name in the current scope, it is in each SelectRankCaseStmt 6130 MakePlaceholder(*name, MiscDetails::Kind::SelectRankAssociateName); 6131 association.name = &*name; 6132 } 6133 } 6134 6135 bool ConstructVisitor::Pre(const parser::SelectTypeConstruct::TypeCase &) { 6136 PushScope(Scope::Kind::Block, nullptr); 6137 return true; 6138 } 6139 void ConstructVisitor::Post(const parser::SelectTypeConstruct::TypeCase &) { 6140 PopScope(); 6141 } 6142 6143 bool ConstructVisitor::Pre(const parser::SelectRankConstruct::RankCase &) { 6144 PushScope(Scope::Kind::Block, nullptr); 6145 return true; 6146 } 6147 void ConstructVisitor::Post(const parser::SelectRankConstruct::RankCase &) { 6148 PopScope(); 6149 } 6150 6151 void ConstructVisitor::Post(const parser::TypeGuardStmt::Guard &x) { 6152 if (auto *symbol{MakeAssocEntity()}) { 6153 if (std::holds_alternative<parser::Default>(x.u)) { 6154 SetTypeFromAssociation(*symbol); 6155 } else if (const auto *type{GetDeclTypeSpec()}) { 6156 symbol->SetType(*type); 6157 } 6158 SetAttrsFromAssociation(*symbol); 6159 } 6160 } 6161 6162 void ConstructVisitor::Post(const parser::SelectRankCaseStmt::Rank &x) { 6163 if (auto *symbol{MakeAssocEntity()}) { 6164 SetTypeFromAssociation(*symbol); 6165 SetAttrsFromAssociation(*symbol); 6166 if (const auto *init{std::get_if<parser::ScalarIntConstantExpr>(&x.u)}) { 6167 if (auto val{EvaluateInt64(context(), *init)}) { 6168 auto &details{symbol->get<AssocEntityDetails>()}; 6169 details.set_rank(*val); 6170 } 6171 } 6172 } 6173 } 6174 6175 bool ConstructVisitor::Pre(const parser::SelectRankConstruct &) { 6176 PushAssociation(); 6177 return true; 6178 } 6179 6180 void ConstructVisitor::Post(const parser::SelectRankConstruct &) { 6181 PopAssociation(); 6182 } 6183 6184 bool ConstructVisitor::CheckDef(const std::optional<parser::Name> &x) { 6185 if (x) { 6186 MakeSymbol(*x, MiscDetails{MiscDetails::Kind::ConstructName}); 6187 } 6188 return true; 6189 } 6190 6191 void ConstructVisitor::CheckRef(const std::optional<parser::Name> &x) { 6192 if (x) { 6193 // Just add an occurrence of this name; checking is done in ValidateLabels 6194 FindSymbol(*x); 6195 } 6196 } 6197 6198 // Make a symbol for the associating entity of the current association. 6199 Symbol *ConstructVisitor::MakeAssocEntity() { 6200 Symbol *symbol{nullptr}; 6201 auto &association{GetCurrentAssociation()}; 6202 if (association.name) { 6203 symbol = &MakeSymbol(*association.name, UnknownDetails{}); 6204 if (symbol->has<AssocEntityDetails>() && symbol->owner() == currScope()) { 6205 Say(*association.name, // C1102 6206 "The associate name '%s' is already used in this associate statement"_err_en_US); 6207 return nullptr; 6208 } 6209 } else if (const Symbol * 6210 whole{UnwrapWholeSymbolDataRef(association.selector.expr)}) { 6211 symbol = &MakeSymbol(whole->name()); 6212 } else { 6213 return nullptr; 6214 } 6215 if (auto &expr{association.selector.expr}) { 6216 symbol->set_details(AssocEntityDetails{common::Clone(*expr)}); 6217 } else { 6218 symbol->set_details(AssocEntityDetails{}); 6219 } 6220 return symbol; 6221 } 6222 6223 // Set the type of symbol based on the current association selector. 6224 void ConstructVisitor::SetTypeFromAssociation(Symbol &symbol) { 6225 auto &details{symbol.get<AssocEntityDetails>()}; 6226 const MaybeExpr *pexpr{&details.expr()}; 6227 if (!*pexpr) { 6228 pexpr = &GetCurrentAssociation().selector.expr; 6229 } 6230 if (*pexpr) { 6231 const SomeExpr &expr{**pexpr}; 6232 if (std::optional<evaluate::DynamicType> type{expr.GetType()}) { 6233 if (const auto *charExpr{ 6234 evaluate::UnwrapExpr<evaluate::Expr<evaluate::SomeCharacter>>( 6235 expr)}) { 6236 symbol.SetType(ToDeclTypeSpec(std::move(*type), 6237 FoldExpr(common::visit( 6238 [](const auto &kindChar) { return kindChar.LEN(); }, 6239 charExpr->u)))); 6240 } else { 6241 symbol.SetType(ToDeclTypeSpec(std::move(*type))); 6242 } 6243 } else { 6244 // BOZ literals, procedure designators, &c. are not acceptable 6245 Say(symbol.name(), "Associate name '%s' must have a type"_err_en_US); 6246 } 6247 } 6248 } 6249 6250 // If current selector is a variable, set some of its attributes on symbol. 6251 void ConstructVisitor::SetAttrsFromAssociation(Symbol &symbol) { 6252 Attrs attrs{evaluate::GetAttrs(GetCurrentAssociation().selector.expr)}; 6253 symbol.attrs() |= attrs & 6254 Attrs{Attr::TARGET, Attr::ASYNCHRONOUS, Attr::VOLATILE, Attr::CONTIGUOUS}; 6255 if (attrs.test(Attr::POINTER)) { 6256 symbol.attrs().set(Attr::TARGET); 6257 } 6258 } 6259 6260 ConstructVisitor::Selector ConstructVisitor::ResolveSelector( 6261 const parser::Selector &x) { 6262 return common::visit(common::visitors{ 6263 [&](const parser::Expr &expr) { 6264 return Selector{expr.source, EvaluateExpr(x)}; 6265 }, 6266 [&](const parser::Variable &var) { 6267 return Selector{var.GetSource(), EvaluateExpr(x)}; 6268 }, 6269 }, 6270 x.u); 6271 } 6272 6273 // Set the current association to the nth to the last association on the 6274 // association stack. The top of the stack is at n = 1. This allows access 6275 // to the interior of a list of associations at the top of the stack. 6276 void ConstructVisitor::SetCurrentAssociation(std::size_t n) { 6277 CHECK(n > 0 && n <= associationStack_.size()); 6278 currentAssociation_ = &associationStack_[associationStack_.size() - n]; 6279 } 6280 6281 ConstructVisitor::Association &ConstructVisitor::GetCurrentAssociation() { 6282 CHECK(currentAssociation_); 6283 return *currentAssociation_; 6284 } 6285 6286 void ConstructVisitor::PushAssociation() { 6287 associationStack_.emplace_back(Association{}); 6288 currentAssociation_ = &associationStack_.back(); 6289 } 6290 6291 void ConstructVisitor::PopAssociation(std::size_t count) { 6292 CHECK(count > 0 && count <= associationStack_.size()); 6293 associationStack_.resize(associationStack_.size() - count); 6294 currentAssociation_ = 6295 associationStack_.empty() ? nullptr : &associationStack_.back(); 6296 } 6297 6298 const DeclTypeSpec &ConstructVisitor::ToDeclTypeSpec( 6299 evaluate::DynamicType &&type) { 6300 switch (type.category()) { 6301 SWITCH_COVERS_ALL_CASES 6302 case common::TypeCategory::Integer: 6303 case common::TypeCategory::Real: 6304 case common::TypeCategory::Complex: 6305 return context().MakeNumericType(type.category(), type.kind()); 6306 case common::TypeCategory::Logical: 6307 return context().MakeLogicalType(type.kind()); 6308 case common::TypeCategory::Derived: 6309 if (type.IsAssumedType()) { 6310 return currScope().MakeTypeStarType(); 6311 } else if (type.IsUnlimitedPolymorphic()) { 6312 return currScope().MakeClassStarType(); 6313 } else { 6314 return currScope().MakeDerivedType( 6315 type.IsPolymorphic() ? DeclTypeSpec::ClassDerived 6316 : DeclTypeSpec::TypeDerived, 6317 common::Clone(type.GetDerivedTypeSpec()) 6318 6319 ); 6320 } 6321 case common::TypeCategory::Character: 6322 CRASH_NO_CASE; 6323 } 6324 } 6325 6326 const DeclTypeSpec &ConstructVisitor::ToDeclTypeSpec( 6327 evaluate::DynamicType &&type, MaybeSubscriptIntExpr &&length) { 6328 CHECK(type.category() == common::TypeCategory::Character); 6329 if (length) { 6330 return currScope().MakeCharacterType( 6331 ParamValue{SomeIntExpr{*std::move(length)}, common::TypeParamAttr::Len}, 6332 KindExpr{type.kind()}); 6333 } else { 6334 return currScope().MakeCharacterType( 6335 ParamValue::Deferred(common::TypeParamAttr::Len), 6336 KindExpr{type.kind()}); 6337 } 6338 } 6339 6340 // ResolveNamesVisitor implementation 6341 6342 bool ResolveNamesVisitor::Pre(const parser::FunctionReference &x) { 6343 HandleCall(Symbol::Flag::Function, x.v); 6344 return false; 6345 } 6346 bool ResolveNamesVisitor::Pre(const parser::CallStmt &x) { 6347 HandleCall(Symbol::Flag::Subroutine, x.v); 6348 return false; 6349 } 6350 6351 bool ResolveNamesVisitor::Pre(const parser::ImportStmt &x) { 6352 auto &scope{currScope()}; 6353 // Check C896 and C899: where IMPORT statements are allowed 6354 switch (scope.kind()) { 6355 case Scope::Kind::Module: 6356 if (scope.IsModule()) { 6357 Say("IMPORT is not allowed in a module scoping unit"_err_en_US); 6358 return false; 6359 } else if (x.kind == common::ImportKind::None) { 6360 Say("IMPORT,NONE is not allowed in a submodule scoping unit"_err_en_US); 6361 return false; 6362 } 6363 break; 6364 case Scope::Kind::MainProgram: 6365 Say("IMPORT is not allowed in a main program scoping unit"_err_en_US); 6366 return false; 6367 case Scope::Kind::Subprogram: 6368 if (scope.parent().IsGlobal()) { 6369 Say("IMPORT is not allowed in an external subprogram scoping unit"_err_en_US); 6370 return false; 6371 } 6372 break; 6373 case Scope::Kind::BlockData: // C1415 (in part) 6374 Say("IMPORT is not allowed in a BLOCK DATA subprogram"_err_en_US); 6375 return false; 6376 default:; 6377 } 6378 if (auto error{scope.SetImportKind(x.kind)}) { 6379 Say(std::move(*error)); 6380 } 6381 for (auto &name : x.names) { 6382 if (FindSymbol(scope.parent(), name)) { 6383 scope.add_importName(name.source); 6384 } else { 6385 Say(name, "'%s' not found in host scope"_err_en_US); 6386 } 6387 } 6388 prevImportStmt_ = currStmtSource(); 6389 return false; 6390 } 6391 6392 const parser::Name *DeclarationVisitor::ResolveStructureComponent( 6393 const parser::StructureComponent &x) { 6394 return FindComponent(ResolveDataRef(x.base), x.component); 6395 } 6396 6397 const parser::Name *DeclarationVisitor::ResolveDesignator( 6398 const parser::Designator &x) { 6399 return common::visit( 6400 common::visitors{ 6401 [&](const parser::DataRef &x) { return ResolveDataRef(x); }, 6402 [&](const parser::Substring &x) { 6403 return ResolveDataRef(std::get<parser::DataRef>(x.t)); 6404 }, 6405 }, 6406 x.u); 6407 } 6408 6409 const parser::Name *DeclarationVisitor::ResolveDataRef( 6410 const parser::DataRef &x) { 6411 return common::visit( 6412 common::visitors{ 6413 [=](const parser::Name &y) { return ResolveName(y); }, 6414 [=](const Indirection<parser::StructureComponent> &y) { 6415 return ResolveStructureComponent(y.value()); 6416 }, 6417 [&](const Indirection<parser::ArrayElement> &y) { 6418 Walk(y.value().subscripts); 6419 const parser::Name *name{ResolveDataRef(y.value().base)}; 6420 if (name && name->symbol) { 6421 if (!IsProcedure(*name->symbol)) { 6422 ConvertToObjectEntity(*name->symbol); 6423 } else if (!context().HasError(*name->symbol)) { 6424 SayWithDecl(*name, *name->symbol, 6425 "Cannot reference function '%s' as data"_err_en_US); 6426 } 6427 } 6428 return name; 6429 }, 6430 [&](const Indirection<parser::CoindexedNamedObject> &y) { 6431 Walk(y.value().imageSelector); 6432 return ResolveDataRef(y.value().base); 6433 }, 6434 }, 6435 x.u); 6436 } 6437 6438 // If implicit types are allowed, ensure name is in the symbol table. 6439 // Otherwise, report an error if it hasn't been declared. 6440 const parser::Name *DeclarationVisitor::ResolveName(const parser::Name &name) { 6441 FindSymbol(name); 6442 if (CheckForHostAssociatedImplicit(name)) { 6443 NotePossibleBadForwardRef(name); 6444 return &name; 6445 } 6446 if (Symbol * symbol{name.symbol}) { 6447 if (CheckUseError(name)) { 6448 return nullptr; // reported an error 6449 } 6450 NotePossibleBadForwardRef(name); 6451 symbol->set(Symbol::Flag::ImplicitOrError, false); 6452 if (IsUplevelReference(*symbol)) { 6453 MakeHostAssocSymbol(name, *symbol); 6454 } else if (IsDummy(*symbol) || 6455 (!symbol->GetType() && FindCommonBlockContaining(*symbol))) { 6456 ConvertToObjectEntity(*symbol); 6457 ApplyImplicitRules(*symbol); 6458 } 6459 if (checkIndexUseInOwnBounds_ && 6460 *checkIndexUseInOwnBounds_ == name.source) { 6461 Say(name, 6462 "Implied DO index '%s' uses an object of the same name in its bounds expressions"_port_en_US, 6463 name.source); 6464 } 6465 return &name; 6466 } 6467 if (isImplicitNoneType()) { 6468 Say(name, "No explicit type declared for '%s'"_err_en_US); 6469 return nullptr; 6470 } 6471 // Create the symbol then ensure it is accessible 6472 if (checkIndexUseInOwnBounds_ && *checkIndexUseInOwnBounds_ == name.source) { 6473 Say(name, 6474 "Implied DO index '%s' uses itself in its own bounds expressions"_err_en_US, 6475 name.source); 6476 } 6477 MakeSymbol(InclusiveScope(), name.source, Attrs{}); 6478 auto *symbol{FindSymbol(name)}; 6479 if (!symbol) { 6480 Say(name, 6481 "'%s' from host scoping unit is not accessible due to IMPORT"_err_en_US); 6482 return nullptr; 6483 } 6484 ConvertToObjectEntity(*symbol); 6485 ApplyImplicitRules(*symbol); 6486 NotePossibleBadForwardRef(name); 6487 return &name; 6488 } 6489 6490 // A specification expression may refer to a symbol in the host procedure that 6491 // is implicitly typed. Because specification parts are processed before 6492 // execution parts, this may be the first time we see the symbol. It can't be a 6493 // local in the current scope (because it's in a specification expression) so 6494 // either it is implicitly declared in the host procedure or it is an error. 6495 // We create a symbol in the host assuming it is the former; if that proves to 6496 // be wrong we report an error later in CheckDeclarations(). 6497 bool DeclarationVisitor::CheckForHostAssociatedImplicit( 6498 const parser::Name &name) { 6499 if (!inSpecificationPart_) { 6500 return false; 6501 } 6502 if (name.symbol) { 6503 ApplyImplicitRules(*name.symbol, true); 6504 } 6505 Symbol *hostSymbol; 6506 Scope *host{GetHostProcedure()}; 6507 if (!host || isImplicitNoneType(*host)) { 6508 return false; 6509 } 6510 if (!name.symbol) { 6511 hostSymbol = &MakeSymbol(*host, name.source, Attrs{}); 6512 ConvertToObjectEntity(*hostSymbol); 6513 ApplyImplicitRules(*hostSymbol); 6514 hostSymbol->set(Symbol::Flag::ImplicitOrError); 6515 } else if (name.symbol->test(Symbol::Flag::ImplicitOrError)) { 6516 hostSymbol = name.symbol; 6517 } else { 6518 return false; 6519 } 6520 Symbol &symbol{MakeHostAssocSymbol(name, *hostSymbol)}; 6521 if (isImplicitNoneType()) { 6522 symbol.get<HostAssocDetails>().implicitOrExplicitTypeError = true; 6523 } else { 6524 symbol.get<HostAssocDetails>().implicitOrSpecExprError = true; 6525 } 6526 return true; 6527 } 6528 6529 bool DeclarationVisitor::IsUplevelReference(const Symbol &symbol) { 6530 const Scope &symbolUnit{GetProgramUnitContaining(symbol)}; 6531 if (symbolUnit == GetProgramUnitContaining(currScope())) { 6532 return false; 6533 } else { 6534 Scope::Kind kind{symbolUnit.kind()}; 6535 return kind == Scope::Kind::Subprogram || kind == Scope::Kind::MainProgram; 6536 } 6537 } 6538 6539 // base is a part-ref of a derived type; find the named component in its type. 6540 // Also handles intrinsic type parameter inquiries (%kind, %len) and 6541 // COMPLEX component references (%re, %im). 6542 const parser::Name *DeclarationVisitor::FindComponent( 6543 const parser::Name *base, const parser::Name &component) { 6544 if (!base || !base->symbol) { 6545 return nullptr; 6546 } 6547 if (auto *misc{base->symbol->detailsIf<MiscDetails>()}) { 6548 if (component.source == "kind") { 6549 if (misc->kind() == MiscDetails::Kind::ComplexPartRe || 6550 misc->kind() == MiscDetails::Kind::ComplexPartIm || 6551 misc->kind() == MiscDetails::Kind::KindParamInquiry || 6552 misc->kind() == MiscDetails::Kind::LenParamInquiry) { 6553 // x%{re,im,kind,len}%kind 6554 MakePlaceholder(component, MiscDetails::Kind::KindParamInquiry); 6555 return &component; 6556 } 6557 } 6558 } 6559 auto &symbol{base->symbol->GetUltimate()}; 6560 if (!symbol.has<AssocEntityDetails>() && !ConvertToObjectEntity(symbol)) { 6561 SayWithDecl(*base, symbol, 6562 "'%s' is an invalid base for a component reference"_err_en_US); 6563 return nullptr; 6564 } 6565 auto *type{symbol.GetType()}; 6566 if (!type) { 6567 return nullptr; // should have already reported error 6568 } 6569 if (const IntrinsicTypeSpec * intrinsic{type->AsIntrinsic()}) { 6570 auto category{intrinsic->category()}; 6571 MiscDetails::Kind miscKind{MiscDetails::Kind::None}; 6572 if (component.source == "kind") { 6573 miscKind = MiscDetails::Kind::KindParamInquiry; 6574 } else if (category == TypeCategory::Character) { 6575 if (component.source == "len") { 6576 miscKind = MiscDetails::Kind::LenParamInquiry; 6577 } 6578 } else if (category == TypeCategory::Complex) { 6579 if (component.source == "re") { 6580 miscKind = MiscDetails::Kind::ComplexPartRe; 6581 } else if (component.source == "im") { 6582 miscKind = MiscDetails::Kind::ComplexPartIm; 6583 } 6584 } 6585 if (miscKind != MiscDetails::Kind::None) { 6586 MakePlaceholder(component, miscKind); 6587 return &component; 6588 } 6589 } else if (const DerivedTypeSpec * derived{type->AsDerived()}) { 6590 if (const Scope * scope{derived->scope()}) { 6591 if (Resolve(component, scope->FindComponent(component.source))) { 6592 if (auto msg{ 6593 CheckAccessibleComponent(currScope(), *component.symbol)}) { 6594 context().Say(component.source, *msg); 6595 } 6596 return &component; 6597 } else { 6598 SayDerivedType(component.source, 6599 "Component '%s' not found in derived type '%s'"_err_en_US, *scope); 6600 } 6601 } 6602 return nullptr; 6603 } 6604 if (symbol.test(Symbol::Flag::Implicit)) { 6605 Say(*base, 6606 "'%s' is not an object of derived type; it is implicitly typed"_err_en_US); 6607 } else { 6608 SayWithDecl( 6609 *base, symbol, "'%s' is not an object of derived type"_err_en_US); 6610 } 6611 return nullptr; 6612 } 6613 6614 void DeclarationVisitor::Initialization(const parser::Name &name, 6615 const parser::Initialization &init, bool inComponentDecl) { 6616 // Traversal of the initializer was deferred to here so that the 6617 // symbol being declared can be available for use in the expression, e.g.: 6618 // real, parameter :: x = tiny(x) 6619 if (!name.symbol) { 6620 return; 6621 } 6622 Symbol &ultimate{name.symbol->GetUltimate()}; 6623 if (IsAllocatable(ultimate)) { 6624 Say(name, "Allocatable object '%s' cannot be initialized"_err_en_US); 6625 return; 6626 } 6627 if (auto *object{ultimate.detailsIf<ObjectEntityDetails>()}) { 6628 // TODO: check C762 - all bounds and type parameters of component 6629 // are colons or constant expressions if component is initialized 6630 common::visit( 6631 common::visitors{ 6632 [&](const parser::ConstantExpr &expr) { 6633 NonPointerInitialization(name, expr); 6634 }, 6635 [&](const parser::NullInit &null) { 6636 Walk(null); 6637 if (auto nullInit{EvaluateExpr(null)}) { 6638 if (!evaluate::IsNullPointer(*nullInit)) { 6639 Say(name, 6640 "Pointer initializer must be intrinsic NULL()"_err_en_US); // C813 6641 } else if (IsPointer(ultimate)) { 6642 object->set_init(std::move(*nullInit)); 6643 } else { 6644 Say(name, 6645 "Non-pointer component '%s' initialized with null pointer"_err_en_US); 6646 } 6647 } 6648 }, 6649 [&](const parser::InitialDataTarget &) { 6650 // Defer analysis to the end of the specification part 6651 // so that forward references and attribute checks like SAVE 6652 // work better. 6653 ultimate.set(Symbol::Flag::InDataStmt); 6654 }, 6655 [&](const std::list<Indirection<parser::DataStmtValue>> &values) { 6656 // Handled later in data-to-inits conversion 6657 ultimate.set(Symbol::Flag::InDataStmt); 6658 Walk(values); 6659 }, 6660 }, 6661 init.u); 6662 } 6663 } 6664 6665 void DeclarationVisitor::PointerInitialization( 6666 const parser::Name &name, const parser::InitialDataTarget &target) { 6667 if (name.symbol) { 6668 Symbol &ultimate{name.symbol->GetUltimate()}; 6669 if (!context().HasError(ultimate)) { 6670 if (IsPointer(ultimate)) { 6671 if (auto *details{ultimate.detailsIf<ObjectEntityDetails>()}) { 6672 CHECK(!details->init()); 6673 Walk(target); 6674 if (MaybeExpr expr{EvaluateExpr(target)}) { 6675 // Validation is done in declaration checking. 6676 details->set_init(std::move(*expr)); 6677 } 6678 } 6679 } else { 6680 Say(name, 6681 "'%s' is not a pointer but is initialized like one"_err_en_US); 6682 context().SetError(ultimate); 6683 } 6684 } 6685 } 6686 } 6687 void DeclarationVisitor::PointerInitialization( 6688 const parser::Name &name, const parser::ProcPointerInit &target) { 6689 if (name.symbol) { 6690 Symbol &ultimate{name.symbol->GetUltimate()}; 6691 if (!context().HasError(ultimate)) { 6692 if (IsProcedurePointer(ultimate)) { 6693 auto &details{ultimate.get<ProcEntityDetails>()}; 6694 CHECK(!details.init()); 6695 Walk(target); 6696 if (const auto *targetName{std::get_if<parser::Name>(&target.u)}) { 6697 if (targetName->symbol) { 6698 // Validation is done in declaration checking. 6699 details.set_init(*targetName->symbol); 6700 } 6701 } else { 6702 details.set_init(nullptr); // explicit NULL() 6703 } 6704 } else { 6705 Say(name, 6706 "'%s' is not a procedure pointer but is initialized " 6707 "like one"_err_en_US); 6708 context().SetError(ultimate); 6709 } 6710 } 6711 } 6712 } 6713 6714 void DeclarationVisitor::NonPointerInitialization( 6715 const parser::Name &name, const parser::ConstantExpr &expr) { 6716 if (name.symbol) { 6717 Symbol &ultimate{name.symbol->GetUltimate()}; 6718 if (!context().HasError(ultimate) && !context().HasError(name.symbol)) { 6719 if (IsPointer(ultimate)) { 6720 Say(name, 6721 "'%s' is a pointer but is not initialized like one"_err_en_US); 6722 } else if (auto *details{ultimate.detailsIf<ObjectEntityDetails>()}) { 6723 CHECK(!details->init()); 6724 Walk(expr); 6725 if (ultimate.owner().IsParameterizedDerivedType()) { 6726 // Save the expression for per-instantiation analysis. 6727 details->set_unanalyzedPDTComponentInit(&expr.thing.value()); 6728 } else { 6729 if (MaybeExpr folded{EvaluateNonPointerInitializer( 6730 ultimate, expr, expr.thing.value().source)}) { 6731 details->set_init(std::move(*folded)); 6732 } 6733 } 6734 } 6735 } 6736 } 6737 } 6738 6739 void ResolveNamesVisitor::HandleCall( 6740 Symbol::Flag procFlag, const parser::Call &call) { 6741 common::visit( 6742 common::visitors{ 6743 [&](const parser::Name &x) { HandleProcedureName(procFlag, x); }, 6744 [&](const parser::ProcComponentRef &x) { Walk(x); }, 6745 }, 6746 std::get<parser::ProcedureDesignator>(call.t).u); 6747 Walk(std::get<std::list<parser::ActualArgSpec>>(call.t)); 6748 } 6749 6750 void ResolveNamesVisitor::HandleProcedureName( 6751 Symbol::Flag flag, const parser::Name &name) { 6752 CHECK(flag == Symbol::Flag::Function || flag == Symbol::Flag::Subroutine); 6753 auto *symbol{FindSymbol(NonDerivedTypeScope(), name)}; 6754 if (!symbol) { 6755 if (IsIntrinsic(name.source, flag)) { 6756 symbol = 6757 &MakeSymbol(InclusiveScope(), name.source, Attrs{Attr::INTRINSIC}); 6758 } else { 6759 symbol = &MakeSymbol(context().globalScope(), name.source, Attrs{}); 6760 } 6761 Resolve(name, *symbol); 6762 if (!symbol->attrs().test(Attr::INTRINSIC)) { 6763 if (CheckImplicitNoneExternal(name.source, *symbol)) { 6764 MakeExternal(*symbol); 6765 } 6766 } 6767 ConvertToProcEntity(*symbol); 6768 SetProcFlag(name, *symbol, flag); 6769 } else if (CheckUseError(name)) { 6770 // error was reported 6771 } else { 6772 auto &nonUltimateSymbol{*symbol}; 6773 symbol = &Resolve(name, symbol)->GetUltimate(); 6774 bool convertedToProcEntity{ConvertToProcEntity(*symbol)}; 6775 if (convertedToProcEntity && !symbol->attrs().test(Attr::EXTERNAL) && 6776 IsIntrinsic(symbol->name(), flag) && !IsDummy(*symbol)) { 6777 AcquireIntrinsicProcedureFlags(*symbol); 6778 } 6779 if (!SetProcFlag(name, *symbol, flag)) { 6780 return; // reported error 6781 } 6782 if (!symbol->has<GenericDetails>()) { 6783 CheckImplicitNoneExternal(name.source, *symbol); 6784 } 6785 if (symbol->has<SubprogramDetails>() && 6786 symbol->attrs().test(Attr::ABSTRACT)) { 6787 Say(name, "Abstract interface '%s' may not be called"_err_en_US); 6788 } else if (IsProcedure(*symbol) || symbol->has<DerivedTypeDetails>() || 6789 symbol->has<AssocEntityDetails>()) { 6790 // Symbols with DerivedTypeDetails and AssocEntityDetails are accepted 6791 // here as procedure-designators because this means the related 6792 // FunctionReference are mis-parsed structure constructors or array 6793 // references that will be fixed later when analyzing expressions. 6794 } else if (symbol->has<ObjectEntityDetails>()) { 6795 // Symbols with ObjectEntityDetails are also accepted because this can be 6796 // a mis-parsed array references that will be fixed later. Ensure that if 6797 // this is a symbol from a host procedure, a symbol with HostAssocDetails 6798 // is created for the current scope. 6799 // Operate on non ultimate symbol so that HostAssocDetails are also 6800 // created for symbols used associated in the host procedure. 6801 if (IsUplevelReference(nonUltimateSymbol)) { 6802 MakeHostAssocSymbol(name, nonUltimateSymbol); 6803 } 6804 } else if (symbol->test(Symbol::Flag::Implicit)) { 6805 Say(name, 6806 "Use of '%s' as a procedure conflicts with its implicit definition"_err_en_US); 6807 } else { 6808 SayWithDecl(name, *symbol, 6809 "Use of '%s' as a procedure conflicts with its declaration"_err_en_US); 6810 } 6811 } 6812 } 6813 6814 bool ResolveNamesVisitor::CheckImplicitNoneExternal( 6815 const SourceName &name, const Symbol &symbol) { 6816 if (isImplicitNoneExternal() && !symbol.attrs().test(Attr::EXTERNAL) && 6817 !symbol.attrs().test(Attr::INTRINSIC) && !symbol.HasExplicitInterface()) { 6818 Say(name, 6819 "'%s' is an external procedure without the EXTERNAL" 6820 " attribute in a scope with IMPLICIT NONE(EXTERNAL)"_err_en_US); 6821 return false; 6822 } 6823 return true; 6824 } 6825 6826 // Variant of HandleProcedureName() for use while skimming the executable 6827 // part of a subprogram to catch calls to dummy procedures that are part 6828 // of the subprogram's interface, and to mark as procedures any symbols 6829 // that might otherwise have been miscategorized as objects. 6830 void ResolveNamesVisitor::NoteExecutablePartCall( 6831 Symbol::Flag flag, const parser::Call &call) { 6832 auto &designator{std::get<parser::ProcedureDesignator>(call.t)}; 6833 if (const auto *name{std::get_if<parser::Name>(&designator.u)}) { 6834 // Subtlety: The symbol pointers in the parse tree are not set, because 6835 // they might end up resolving elsewhere (e.g., construct entities in 6836 // SELECT TYPE). 6837 if (Symbol * symbol{currScope().FindSymbol(name->source)}) { 6838 Symbol::Flag other{flag == Symbol::Flag::Subroutine 6839 ? Symbol::Flag::Function 6840 : Symbol::Flag::Subroutine}; 6841 if (!symbol->test(other)) { 6842 ConvertToProcEntity(*symbol); 6843 if (symbol->has<ProcEntityDetails>()) { 6844 symbol->set(flag); 6845 if (IsDummy(*symbol)) { 6846 symbol->attrs().set(Attr::EXTERNAL); 6847 } 6848 ApplyImplicitRules(*symbol); 6849 } 6850 } 6851 } 6852 } 6853 } 6854 6855 static bool IsLocallyImplicitGlobalSymbol( 6856 const Symbol &symbol, const parser::Name &localName) { 6857 return symbol.owner().IsGlobal() && 6858 (!symbol.scope() || 6859 !symbol.scope()->sourceRange().Contains(localName.source)); 6860 } 6861 6862 static bool TypesMismatchIfNonNull( 6863 const DeclTypeSpec *type1, const DeclTypeSpec *type2) { 6864 return type1 && type2 && *type1 != *type2; 6865 } 6866 6867 // Check and set the Function or Subroutine flag on symbol; false on error. 6868 bool ResolveNamesVisitor::SetProcFlag( 6869 const parser::Name &name, Symbol &symbol, Symbol::Flag flag) { 6870 if (symbol.test(Symbol::Flag::Function) && flag == Symbol::Flag::Subroutine) { 6871 SayWithDecl( 6872 name, symbol, "Cannot call function '%s' like a subroutine"_err_en_US); 6873 return false; 6874 } else if (symbol.test(Symbol::Flag::Subroutine) && 6875 flag == Symbol::Flag::Function) { 6876 SayWithDecl( 6877 name, symbol, "Cannot call subroutine '%s' like a function"_err_en_US); 6878 return false; 6879 } else if (flag == Symbol::Flag::Function && 6880 IsLocallyImplicitGlobalSymbol(symbol, name) && 6881 TypesMismatchIfNonNull(symbol.GetType(), GetImplicitType(symbol))) { 6882 SayWithDecl(name, symbol, 6883 "Implicit declaration of function '%s' has a different result type than in previous declaration"_err_en_US); 6884 return false; 6885 } else if (symbol.has<ProcEntityDetails>()) { 6886 symbol.set(flag); // in case it hasn't been set yet 6887 if (flag == Symbol::Flag::Function) { 6888 ApplyImplicitRules(symbol); 6889 } 6890 if (symbol.attrs().test(Attr::INTRINSIC)) { 6891 AcquireIntrinsicProcedureFlags(symbol); 6892 } 6893 } else if (symbol.GetType() && flag == Symbol::Flag::Subroutine) { 6894 SayWithDecl( 6895 name, symbol, "Cannot call function '%s' like a subroutine"_err_en_US); 6896 } else if (symbol.attrs().test(Attr::INTRINSIC)) { 6897 AcquireIntrinsicProcedureFlags(symbol); 6898 } 6899 return true; 6900 } 6901 6902 bool ModuleVisitor::Pre(const parser::AccessStmt &x) { 6903 Attr accessAttr{AccessSpecToAttr(std::get<parser::AccessSpec>(x.t))}; 6904 if (!currScope().IsModule()) { // C869 6905 Say(currStmtSource().value(), 6906 "%s statement may only appear in the specification part of a module"_err_en_US, 6907 EnumToString(accessAttr)); 6908 return false; 6909 } 6910 const auto &accessIds{std::get<std::list<parser::AccessId>>(x.t)}; 6911 if (accessIds.empty()) { 6912 if (prevAccessStmt_) { // C869 6913 Say("The default accessibility of this module has already been declared"_err_en_US) 6914 .Attach(*prevAccessStmt_, "Previous declaration"_en_US); 6915 } 6916 prevAccessStmt_ = currStmtSource(); 6917 defaultAccess_ = accessAttr; 6918 } else { 6919 for (const auto &accessId : accessIds) { 6920 common::visit( 6921 common::visitors{ 6922 [=](const parser::Name &y) { 6923 Resolve(y, SetAccess(y.source, accessAttr)); 6924 }, 6925 [=](const Indirection<parser::GenericSpec> &y) { 6926 auto info{GenericSpecInfo{y.value()}}; 6927 const auto &symbolName{info.symbolName()}; 6928 if (auto *symbol{FindInScope(symbolName)}) { 6929 info.Resolve(&SetAccess(symbolName, accessAttr, symbol)); 6930 } else if (info.kind().IsName()) { 6931 info.Resolve(&SetAccess(symbolName, accessAttr)); 6932 } else { 6933 Say(symbolName, "Generic spec '%s' not found"_err_en_US); 6934 } 6935 }, 6936 }, 6937 accessId.u); 6938 } 6939 } 6940 return false; 6941 } 6942 6943 // Set the access specification for this symbol. 6944 Symbol &ModuleVisitor::SetAccess( 6945 const SourceName &name, Attr attr, Symbol *symbol) { 6946 if (!symbol) { 6947 symbol = &MakeSymbol(name); 6948 } 6949 Attrs &attrs{symbol->attrs()}; 6950 if (attrs.HasAny({Attr::PUBLIC, Attr::PRIVATE})) { 6951 // PUBLIC/PRIVATE already set: make it a fatal error if it changed 6952 Attr prev = attrs.test(Attr::PUBLIC) ? Attr::PUBLIC : Attr::PRIVATE; 6953 Say(name, 6954 WithSeverity( 6955 "The accessibility of '%s' has already been specified as %s"_warn_en_US, 6956 attr != prev ? parser::Severity::Error : parser::Severity::Warning), 6957 MakeOpName(name), EnumToString(prev)); 6958 } else { 6959 attrs.set(attr); 6960 } 6961 return *symbol; 6962 } 6963 6964 static bool NeedsExplicitType(const Symbol &symbol) { 6965 if (symbol.has<UnknownDetails>()) { 6966 return true; 6967 } else if (const auto *details{symbol.detailsIf<EntityDetails>()}) { 6968 return !details->type(); 6969 } else if (const auto *details{symbol.detailsIf<ObjectEntityDetails>()}) { 6970 return !details->type(); 6971 } else if (const auto *details{symbol.detailsIf<ProcEntityDetails>()}) { 6972 return !details->interface().symbol() && !details->interface().type(); 6973 } else { 6974 return false; 6975 } 6976 } 6977 6978 bool ResolveNamesVisitor::Pre(const parser::SpecificationPart &x) { 6979 const auto &[accDecls, ompDecls, compilerDirectives, useStmts, importStmts, 6980 implicitPart, decls] = x.t; 6981 auto flagRestorer{common::ScopedSet(inSpecificationPart_, true)}; 6982 auto stateRestorer{ 6983 common::ScopedSet(specPartState_, SpecificationPartState{})}; 6984 Walk(accDecls); 6985 Walk(ompDecls); 6986 Walk(compilerDirectives); 6987 Walk(useStmts); 6988 ClearUseRenames(); 6989 ClearUseOnly(); 6990 ClearExplicitIntrinsicUses(); 6991 Walk(importStmts); 6992 Walk(implicitPart); 6993 for (const auto &decl : decls) { 6994 if (const auto *spec{ 6995 std::get_if<parser::SpecificationConstruct>(&decl.u)}) { 6996 PreSpecificationConstruct(*spec); 6997 } 6998 } 6999 Walk(decls); 7000 FinishSpecificationPart(decls); 7001 return false; 7002 } 7003 7004 // Initial processing on specification constructs, before visiting them. 7005 void ResolveNamesVisitor::PreSpecificationConstruct( 7006 const parser::SpecificationConstruct &spec) { 7007 common::visit( 7008 common::visitors{ 7009 [&](const parser::Statement<Indirection<parser::GenericStmt>> &y) { 7010 CreateGeneric(std::get<parser::GenericSpec>(y.statement.value().t)); 7011 }, 7012 [&](const Indirection<parser::InterfaceBlock> &y) { 7013 const auto &stmt{std::get<parser::Statement<parser::InterfaceStmt>>( 7014 y.value().t)}; 7015 if (const auto *spec{parser::Unwrap<parser::GenericSpec>(stmt)}) { 7016 CreateGeneric(*spec); 7017 } 7018 }, 7019 [&](const parser::Statement<parser::OtherSpecificationStmt> &y) { 7020 if (const auto *commonStmt{parser::Unwrap<parser::CommonStmt>(y)}) { 7021 CreateCommonBlockSymbols(*commonStmt); 7022 } 7023 }, 7024 [&](const auto &) {}, 7025 }, 7026 spec.u); 7027 } 7028 7029 void ResolveNamesVisitor::CreateCommonBlockSymbols( 7030 const parser::CommonStmt &commonStmt) { 7031 for (const parser::CommonStmt::Block &block : commonStmt.blocks) { 7032 const auto &[name, objects] = block.t; 7033 Symbol &commonBlock{MakeCommonBlockSymbol(name)}; 7034 for (const auto &object : objects) { 7035 Symbol &obj{DeclareObjectEntity(std::get<parser::Name>(object.t))}; 7036 if (auto *details{obj.detailsIf<ObjectEntityDetails>()}) { 7037 details->set_commonBlock(commonBlock); 7038 commonBlock.get<CommonBlockDetails>().add_object(obj); 7039 } 7040 } 7041 } 7042 } 7043 7044 void ResolveNamesVisitor::CreateGeneric(const parser::GenericSpec &x) { 7045 auto info{GenericSpecInfo{x}}; 7046 SourceName symbolName{info.symbolName()}; 7047 if (IsLogicalConstant(context(), symbolName)) { 7048 Say(symbolName, 7049 "Logical constant '%s' may not be used as a defined operator"_err_en_US); 7050 return; 7051 } 7052 GenericDetails genericDetails; 7053 Symbol *existing{nullptr}; 7054 // Check all variants of names, e.g. "operator(.ne.)" for "operator(/=)" 7055 for (const std::string &n : GetAllNames(context(), symbolName)) { 7056 if (auto iter{currScope().find(n)}; iter != currScope().end()) { 7057 existing = &*iter->second; 7058 break; 7059 } 7060 } 7061 if (existing) { 7062 Symbol &ultimate{existing->GetUltimate()}; 7063 if (const auto *existingGeneric{ultimate.detailsIf<GenericDetails>()}) { 7064 if (const auto *existingUse{existing->detailsIf<UseDetails>()}) { 7065 // Create a local copy of a use associated generic so that 7066 // it can be locally extended without corrupting the original. 7067 genericDetails.CopyFrom(*existingGeneric); 7068 AddGenericUse(genericDetails, existing->name(), existingUse->symbol()); 7069 } else if (existing == &ultimate) { 7070 // Extending an extant generic in the same scope 7071 info.Resolve(existing); 7072 return; 7073 } else { 7074 // Host association of a generic is handled in ResolveGeneric() 7075 CHECK(existing->has<HostAssocDetails>()); 7076 } 7077 } else if (ultimate.has<SubprogramDetails>() || 7078 ultimate.has<SubprogramNameDetails>()) { 7079 genericDetails.set_specific(ultimate); 7080 } else if (ultimate.has<DerivedTypeDetails>()) { 7081 genericDetails.set_derivedType(ultimate); 7082 } else { 7083 SayAlreadyDeclared(symbolName, *existing); 7084 return; 7085 } 7086 EraseSymbol(*existing); 7087 } 7088 info.Resolve(&MakeSymbol(symbolName, Attrs{}, std::move(genericDetails))); 7089 } 7090 7091 void ResolveNamesVisitor::FinishSpecificationPart( 7092 const std::list<parser::DeclarationConstruct> &decls) { 7093 badStmtFuncFound_ = false; 7094 funcResultStack().CompleteFunctionResultType(); 7095 CheckImports(); 7096 bool inModule{currScope().kind() == Scope::Kind::Module}; 7097 for (auto &pair : currScope()) { 7098 auto &symbol{*pair.second}; 7099 if (NeedsExplicitType(symbol)) { 7100 ApplyImplicitRules(symbol); 7101 } 7102 if (IsDummy(symbol) && isImplicitNoneType() && 7103 symbol.test(Symbol::Flag::Implicit) && !context().HasError(symbol)) { 7104 Say(symbol.name(), 7105 "No explicit type declared for dummy argument '%s'"_err_en_US); 7106 context().SetError(symbol); 7107 } 7108 if (symbol.has<GenericDetails>()) { 7109 CheckGenericProcedures(symbol); 7110 } 7111 if (inModule && symbol.attrs().test(Attr::EXTERNAL) && 7112 !symbol.test(Symbol::Flag::Function) && 7113 !symbol.test(Symbol::Flag::Subroutine)) { 7114 // in a module, external proc without return type is subroutine 7115 symbol.set( 7116 symbol.GetType() ? Symbol::Flag::Function : Symbol::Flag::Subroutine); 7117 } 7118 if (!symbol.has<HostAssocDetails>()) { 7119 CheckPossibleBadForwardRef(symbol); 7120 } 7121 } 7122 currScope().InstantiateDerivedTypes(); 7123 for (const auto &decl : decls) { 7124 if (const auto *statement{std::get_if< 7125 parser::Statement<common::Indirection<parser::StmtFunctionStmt>>>( 7126 &decl.u)}) { 7127 AnalyzeStmtFunctionStmt(statement->statement.value()); 7128 } 7129 } 7130 // TODO: what about instantiations in BLOCK? 7131 CheckSaveStmts(); 7132 CheckCommonBlocks(); 7133 if (!inInterfaceBlock()) { 7134 // TODO: warn for the case where the EQUIVALENCE statement is in a 7135 // procedure declaration in an interface block 7136 CheckEquivalenceSets(); 7137 } 7138 } 7139 7140 // Analyze the bodies of statement functions now that the symbols in this 7141 // specification part have been fully declared and implicitly typed. 7142 void ResolveNamesVisitor::AnalyzeStmtFunctionStmt( 7143 const parser::StmtFunctionStmt &stmtFunc) { 7144 Symbol *symbol{std::get<parser::Name>(stmtFunc.t).symbol}; 7145 if (!symbol || !symbol->has<SubprogramDetails>()) { 7146 return; 7147 } 7148 auto &details{symbol->get<SubprogramDetails>()}; 7149 auto expr{AnalyzeExpr( 7150 context(), std::get<parser::Scalar<parser::Expr>>(stmtFunc.t))}; 7151 if (!expr) { 7152 context().SetError(*symbol); 7153 return; 7154 } 7155 if (auto type{evaluate::DynamicType::From(*symbol)}) { 7156 auto converted{ConvertToType(*type, std::move(*expr))}; 7157 if (!converted) { 7158 context().SetError(*symbol); 7159 return; 7160 } 7161 details.set_stmtFunction(std::move(*converted)); 7162 } else { 7163 details.set_stmtFunction(std::move(*expr)); 7164 } 7165 } 7166 7167 void ResolveNamesVisitor::CheckImports() { 7168 auto &scope{currScope()}; 7169 switch (scope.GetImportKind()) { 7170 case common::ImportKind::None: 7171 break; 7172 case common::ImportKind::All: 7173 // C8102: all entities in host must not be hidden 7174 for (const auto &pair : scope.parent()) { 7175 auto &name{pair.first}; 7176 std::optional<SourceName> scopeName{scope.GetName()}; 7177 if (!scopeName || name != *scopeName) { 7178 CheckImport(prevImportStmt_.value(), name); 7179 } 7180 } 7181 break; 7182 case common::ImportKind::Default: 7183 case common::ImportKind::Only: 7184 // C8102: entities named in IMPORT must not be hidden 7185 for (auto &name : scope.importNames()) { 7186 CheckImport(name, name); 7187 } 7188 break; 7189 } 7190 } 7191 7192 void ResolveNamesVisitor::CheckImport( 7193 const SourceName &location, const SourceName &name) { 7194 if (auto *symbol{FindInScope(name)}) { 7195 const Symbol &ultimate{symbol->GetUltimate()}; 7196 if (&ultimate.owner() == &currScope()) { 7197 Say(location, "'%s' from host is not accessible"_err_en_US, name) 7198 .Attach(symbol->name(), "'%s' is hidden by this entity"_en_US, 7199 symbol->name()); 7200 } 7201 } 7202 } 7203 7204 bool ResolveNamesVisitor::Pre(const parser::ImplicitStmt &x) { 7205 return CheckNotInBlock("IMPLICIT") && // C1107 7206 ImplicitRulesVisitor::Pre(x); 7207 } 7208 7209 void ResolveNamesVisitor::Post(const parser::PointerObject &x) { 7210 common::visit(common::visitors{ 7211 [&](const parser::Name &x) { ResolveName(x); }, 7212 [&](const parser::StructureComponent &x) { 7213 ResolveStructureComponent(x); 7214 }, 7215 }, 7216 x.u); 7217 } 7218 void ResolveNamesVisitor::Post(const parser::AllocateObject &x) { 7219 common::visit(common::visitors{ 7220 [&](const parser::Name &x) { ResolveName(x); }, 7221 [&](const parser::StructureComponent &x) { 7222 ResolveStructureComponent(x); 7223 }, 7224 }, 7225 x.u); 7226 } 7227 7228 bool ResolveNamesVisitor::Pre(const parser::PointerAssignmentStmt &x) { 7229 const auto &dataRef{std::get<parser::DataRef>(x.t)}; 7230 const auto &bounds{std::get<parser::PointerAssignmentStmt::Bounds>(x.t)}; 7231 const auto &expr{std::get<parser::Expr>(x.t)}; 7232 ResolveDataRef(dataRef); 7233 Walk(bounds); 7234 // Resolve unrestricted specific intrinsic procedures as in "p => cos". 7235 if (const parser::Name * name{parser::Unwrap<parser::Name>(expr)}) { 7236 if (NameIsKnownOrIntrinsic(*name)) { 7237 // If the name is known because it is an object entity from a host 7238 // procedure, create a host associated symbol. 7239 if (Symbol * symbol{name->symbol}; symbol && 7240 symbol->GetUltimate().has<ObjectEntityDetails>() && 7241 IsUplevelReference(*symbol)) { 7242 MakeHostAssocSymbol(*name, *symbol); 7243 } 7244 return false; 7245 } 7246 } 7247 Walk(expr); 7248 return false; 7249 } 7250 void ResolveNamesVisitor::Post(const parser::Designator &x) { 7251 ResolveDesignator(x); 7252 } 7253 7254 void ResolveNamesVisitor::Post(const parser::ProcComponentRef &x) { 7255 ResolveStructureComponent(x.v.thing); 7256 } 7257 void ResolveNamesVisitor::Post(const parser::TypeGuardStmt &x) { 7258 DeclTypeSpecVisitor::Post(x); 7259 ConstructVisitor::Post(x); 7260 } 7261 bool ResolveNamesVisitor::Pre(const parser::StmtFunctionStmt &x) { 7262 CheckNotInBlock("STATEMENT FUNCTION"); // C1107 7263 if (HandleStmtFunction(x)) { 7264 return false; 7265 } else { 7266 // This is an array element assignment: resolve names of indices 7267 const auto &names{std::get<std::list<parser::Name>>(x.t)}; 7268 for (auto &name : names) { 7269 ResolveName(name); 7270 } 7271 return true; 7272 } 7273 } 7274 7275 bool ResolveNamesVisitor::Pre(const parser::DefinedOpName &x) { 7276 const parser::Name &name{x.v}; 7277 if (FindSymbol(name)) { 7278 // OK 7279 } else if (IsLogicalConstant(context(), name.source)) { 7280 Say(name, 7281 "Logical constant '%s' may not be used as a defined operator"_err_en_US); 7282 } else { 7283 // Resolved later in expression semantics 7284 MakePlaceholder(name, MiscDetails::Kind::TypeBoundDefinedOp); 7285 } 7286 return false; 7287 } 7288 7289 void ResolveNamesVisitor::Post(const parser::AssignStmt &x) { 7290 if (auto *name{ResolveName(std::get<parser::Name>(x.t))}) { 7291 ConvertToObjectEntity(DEREF(name->symbol)); 7292 } 7293 } 7294 void ResolveNamesVisitor::Post(const parser::AssignedGotoStmt &x) { 7295 if (auto *name{ResolveName(std::get<parser::Name>(x.t))}) { 7296 ConvertToObjectEntity(DEREF(name->symbol)); 7297 } 7298 } 7299 7300 bool ResolveNamesVisitor::Pre(const parser::ProgramUnit &x) { 7301 if (std::holds_alternative<common::Indirection<parser::CompilerDirective>>( 7302 x.u)) { 7303 // TODO: global directives 7304 return true; 7305 } 7306 auto root{ProgramTree::Build(x)}; 7307 SetScope(topScope_); 7308 ResolveSpecificationParts(root); 7309 FinishSpecificationParts(root); 7310 ResolveExecutionParts(root); 7311 ResolveAccParts(context(), x); 7312 ResolveOmpParts(context(), x); 7313 return false; 7314 } 7315 7316 // References to procedures need to record that their symbols are known 7317 // to be procedures, so that they don't get converted to objects by default. 7318 class ExecutionPartSkimmer { 7319 public: 7320 explicit ExecutionPartSkimmer(ResolveNamesVisitor &resolver) 7321 : resolver_{resolver} {} 7322 7323 void Walk(const parser::ExecutionPart *exec) { 7324 if (exec) { 7325 parser::Walk(*exec, *this); 7326 } 7327 } 7328 7329 template <typename A> bool Pre(const A &) { return true; } 7330 template <typename A> void Post(const A &) {} 7331 void Post(const parser::FunctionReference &fr) { 7332 resolver_.NoteExecutablePartCall(Symbol::Flag::Function, fr.v); 7333 } 7334 void Post(const parser::CallStmt &cs) { 7335 resolver_.NoteExecutablePartCall(Symbol::Flag::Subroutine, cs.v); 7336 } 7337 7338 private: 7339 ResolveNamesVisitor &resolver_; 7340 }; 7341 7342 // Build the scope tree and resolve names in the specification parts of this 7343 // node and its children 7344 void ResolveNamesVisitor::ResolveSpecificationParts(ProgramTree &node) { 7345 if (node.isSpecificationPartResolved()) { 7346 return; // been here already 7347 } 7348 node.set_isSpecificationPartResolved(); 7349 if (!BeginScopeForNode(node)) { 7350 return; // an error prevented scope from being created 7351 } 7352 Scope &scope{currScope()}; 7353 node.set_scope(scope); 7354 AddSubpNames(node); 7355 common::visit( 7356 [&](const auto *x) { 7357 if (x) { 7358 Walk(*x); 7359 } 7360 }, 7361 node.stmt()); 7362 Walk(node.spec()); 7363 // If this is a function, convert result to an object. This is to prevent the 7364 // result from being converted later to a function symbol if it is called 7365 // inside the function. 7366 // If the result is function pointer, then ConvertToObjectEntity will not 7367 // convert the result to an object, and calling the symbol inside the function 7368 // will result in calls to the result pointer. 7369 // A function cannot be called recursively if RESULT was not used to define a 7370 // distinct result name (15.6.2.2 point 4.). 7371 if (Symbol * symbol{scope.symbol()}) { 7372 if (auto *details{symbol->detailsIf<SubprogramDetails>()}) { 7373 if (details->isFunction()) { 7374 ConvertToObjectEntity(const_cast<Symbol &>(details->result())); 7375 } 7376 } 7377 } 7378 if (node.IsModule()) { 7379 ApplyDefaultAccess(); 7380 } 7381 for (auto &child : node.children()) { 7382 ResolveSpecificationParts(child); 7383 } 7384 ExecutionPartSkimmer{*this}.Walk(node.exec()); 7385 EndScopeForNode(node); 7386 // Ensure that every object entity has a type. 7387 for (auto &pair : *node.scope()) { 7388 ApplyImplicitRules(*pair.second); 7389 } 7390 } 7391 7392 // Add SubprogramNameDetails symbols for module and internal subprograms and 7393 // their ENTRY statements. 7394 void ResolveNamesVisitor::AddSubpNames(ProgramTree &node) { 7395 auto kind{ 7396 node.IsModule() ? SubprogramKind::Module : SubprogramKind::Internal}; 7397 for (auto &child : node.children()) { 7398 auto &symbol{MakeSymbol(child.name(), SubprogramNameDetails{kind, child})}; 7399 auto childKind{child.GetKind()}; 7400 if (childKind == ProgramTree::Kind::Function) { 7401 symbol.set(Symbol::Flag::Function); 7402 } else if (childKind == ProgramTree::Kind::Subroutine) { 7403 symbol.set(Symbol::Flag::Subroutine); 7404 } else { 7405 continue; // make ENTRY symbols only where valid 7406 } 7407 for (const auto &entryStmt : child.entryStmts()) { 7408 SubprogramNameDetails details{kind, child}; 7409 auto &symbol{ 7410 MakeSymbol(std::get<parser::Name>(entryStmt->t), std::move(details))}; 7411 symbol.set(child.GetSubpFlag()); 7412 } 7413 } 7414 for (const auto &generic : node.genericSpecs()) { 7415 if (const auto *name{std::get_if<parser::Name>(&generic->u)}) { 7416 if (currScope().find(name->source) != currScope().end()) { 7417 // If this scope has both a generic interface and a contained 7418 // subprogram with the same name, create the generic's symbol 7419 // now so that any other generics of the same name that are pulled 7420 // into scope later via USE association will properly merge instead 7421 // of raising a bogus error due a conflict with the subprogram. 7422 CreateGeneric(*generic); 7423 } 7424 } 7425 } 7426 } 7427 7428 // Push a new scope for this node or return false on error. 7429 bool ResolveNamesVisitor::BeginScopeForNode(const ProgramTree &node) { 7430 switch (node.GetKind()) { 7431 SWITCH_COVERS_ALL_CASES 7432 case ProgramTree::Kind::Program: 7433 PushScope(Scope::Kind::MainProgram, 7434 &MakeSymbol(node.name(), MainProgramDetails{})); 7435 return true; 7436 case ProgramTree::Kind::Function: 7437 case ProgramTree::Kind::Subroutine: 7438 return BeginSubprogram(node.name(), node.GetSubpFlag(), 7439 node.HasModulePrefix(), node.bindingSpec(), &node.entryStmts()); 7440 case ProgramTree::Kind::MpSubprogram: 7441 return BeginMpSubprogram(node.name()); 7442 case ProgramTree::Kind::Module: 7443 BeginModule(node.name(), false); 7444 return true; 7445 case ProgramTree::Kind::Submodule: 7446 return BeginSubmodule(node.name(), node.GetParentId()); 7447 case ProgramTree::Kind::BlockData: 7448 PushBlockDataScope(node.name()); 7449 return true; 7450 } 7451 } 7452 7453 void ResolveNamesVisitor::EndScopeForNode(const ProgramTree &node) { 7454 std::optional<parser::CharBlock> stmtSource; 7455 const std::optional<parser::LanguageBindingSpec> *binding{nullptr}; 7456 common::visit( 7457 common::visitors{ 7458 [&](const parser::Statement<parser::FunctionStmt> *stmt) { 7459 if (stmt) { 7460 stmtSource = stmt->source; 7461 if (const auto &maybeSuffix{ 7462 std::get<std::optional<parser::Suffix>>( 7463 stmt->statement.t)}) { 7464 binding = &maybeSuffix->binding; 7465 } 7466 } 7467 }, 7468 [&](const parser::Statement<parser::SubroutineStmt> *stmt) { 7469 if (stmt) { 7470 stmtSource = stmt->source; 7471 binding = &std::get<std::optional<parser::LanguageBindingSpec>>( 7472 stmt->statement.t); 7473 } 7474 }, 7475 [](const auto *) {}, 7476 }, 7477 node.stmt()); 7478 EndSubprogram(stmtSource, binding); 7479 } 7480 7481 // Some analyses and checks, such as the processing of initializers of 7482 // pointers, are deferred until all of the pertinent specification parts 7483 // have been visited. This deferred processing enables the use of forward 7484 // references in these circumstances. 7485 class DeferredCheckVisitor { 7486 public: 7487 explicit DeferredCheckVisitor(ResolveNamesVisitor &resolver) 7488 : resolver_{resolver} {} 7489 7490 template <typename A> void Walk(const A &x) { parser::Walk(x, *this); } 7491 7492 template <typename A> bool Pre(const A &) { return true; } 7493 template <typename A> void Post(const A &) {} 7494 7495 void Post(const parser::DerivedTypeStmt &x) { 7496 const auto &name{std::get<parser::Name>(x.t)}; 7497 if (Symbol * symbol{name.symbol}) { 7498 if (Scope * scope{symbol->scope()}) { 7499 if (scope->IsDerivedType()) { 7500 resolver_.PushScope(*scope); 7501 pushedScope_ = true; 7502 } 7503 } 7504 } 7505 } 7506 void Post(const parser::EndTypeStmt &) { 7507 if (pushedScope_) { 7508 resolver_.PopScope(); 7509 pushedScope_ = false; 7510 } 7511 } 7512 7513 void Post(const parser::ProcInterface &pi) { 7514 if (const auto *name{std::get_if<parser::Name>(&pi.u)}) { 7515 resolver_.CheckExplicitInterface(*name); 7516 } 7517 } 7518 bool Pre(const parser::EntityDecl &decl) { 7519 Init(std::get<parser::Name>(decl.t), 7520 std::get<std::optional<parser::Initialization>>(decl.t)); 7521 return false; 7522 } 7523 bool Pre(const parser::ComponentDecl &decl) { 7524 Init(std::get<parser::Name>(decl.t), 7525 std::get<std::optional<parser::Initialization>>(decl.t)); 7526 return false; 7527 } 7528 bool Pre(const parser::ProcDecl &decl) { 7529 if (const auto &init{ 7530 std::get<std::optional<parser::ProcPointerInit>>(decl.t)}) { 7531 resolver_.PointerInitialization(std::get<parser::Name>(decl.t), *init); 7532 } 7533 return false; 7534 } 7535 void Post(const parser::TypeBoundProcedureStmt::WithInterface &tbps) { 7536 resolver_.CheckExplicitInterface(tbps.interfaceName); 7537 } 7538 void Post(const parser::TypeBoundProcedureStmt::WithoutInterface &tbps) { 7539 if (pushedScope_) { 7540 resolver_.CheckBindings(tbps); 7541 } 7542 } 7543 7544 private: 7545 void Init(const parser::Name &name, 7546 const std::optional<parser::Initialization> &init) { 7547 if (init) { 7548 if (const auto *target{ 7549 std::get_if<parser::InitialDataTarget>(&init->u)}) { 7550 resolver_.PointerInitialization(name, *target); 7551 } 7552 } 7553 } 7554 7555 ResolveNamesVisitor &resolver_; 7556 bool pushedScope_{false}; 7557 }; 7558 7559 // Perform checks and completions that need to happen after all of 7560 // the specification parts but before any of the execution parts. 7561 void ResolveNamesVisitor::FinishSpecificationParts(const ProgramTree &node) { 7562 if (!node.scope()) { 7563 return; // error occurred creating scope 7564 } 7565 SetScope(*node.scope()); 7566 // The initializers of pointers, the default initializers of pointer 7567 // components, and non-deferred type-bound procedure bindings have not 7568 // yet been traversed. 7569 // We do that now, when any (formerly) forward references that appear 7570 // in those initializers will resolve to the right symbols without 7571 // incurring spurious errors with IMPLICIT NONE. 7572 DeferredCheckVisitor{*this}.Walk(node.spec()); 7573 DeferredCheckVisitor{*this}.Walk(node.exec()); // for BLOCK 7574 for (Scope &childScope : currScope().children()) { 7575 if (childScope.IsParameterizedDerivedTypeInstantiation()) { 7576 FinishDerivedTypeInstantiation(childScope); 7577 } 7578 } 7579 for (const auto &child : node.children()) { 7580 FinishSpecificationParts(child); 7581 } 7582 } 7583 7584 // Duplicate and fold component object pointer default initializer designators 7585 // using the actual type parameter values of each particular instantiation. 7586 // Validation is done later in declaration checking. 7587 void ResolveNamesVisitor::FinishDerivedTypeInstantiation(Scope &scope) { 7588 CHECK(scope.IsDerivedType() && !scope.symbol()); 7589 if (DerivedTypeSpec * spec{scope.derivedTypeSpec()}) { 7590 spec->Instantiate(currScope()); 7591 const Symbol &origTypeSymbol{spec->typeSymbol()}; 7592 if (const Scope * origTypeScope{origTypeSymbol.scope()}) { 7593 CHECK(origTypeScope->IsDerivedType() && 7594 origTypeScope->symbol() == &origTypeSymbol); 7595 auto &foldingContext{GetFoldingContext()}; 7596 auto restorer{foldingContext.WithPDTInstance(*spec)}; 7597 for (auto &pair : scope) { 7598 Symbol &comp{*pair.second}; 7599 const Symbol &origComp{DEREF(FindInScope(*origTypeScope, comp.name()))}; 7600 if (IsPointer(comp)) { 7601 if (auto *details{comp.detailsIf<ObjectEntityDetails>()}) { 7602 auto origDetails{origComp.get<ObjectEntityDetails>()}; 7603 if (const MaybeExpr & init{origDetails.init()}) { 7604 SomeExpr newInit{*init}; 7605 MaybeExpr folded{ 7606 evaluate::Fold(foldingContext, std::move(newInit))}; 7607 details->set_init(std::move(folded)); 7608 } 7609 } 7610 } 7611 } 7612 } 7613 } 7614 } 7615 7616 // Resolve names in the execution part of this node and its children 7617 void ResolveNamesVisitor::ResolveExecutionParts(const ProgramTree &node) { 7618 if (!node.scope()) { 7619 return; // error occurred creating scope 7620 } 7621 SetScope(*node.scope()); 7622 if (const auto *exec{node.exec()}) { 7623 Walk(*exec); 7624 } 7625 FinishNamelists(); 7626 PopScope(); // converts unclassified entities into objects 7627 for (const auto &child : node.children()) { 7628 ResolveExecutionParts(child); 7629 } 7630 } 7631 7632 void ResolveNamesVisitor::Post(const parser::Program &) { 7633 // ensure that all temps were deallocated 7634 CHECK(!attrs_); 7635 CHECK(!GetDeclTypeSpec()); 7636 } 7637 7638 // A singleton instance of the scope -> IMPLICIT rules mapping is 7639 // shared by all instances of ResolveNamesVisitor and accessed by this 7640 // pointer when the visitors (other than the top-level original) are 7641 // constructed. 7642 static ImplicitRulesMap *sharedImplicitRulesMap{nullptr}; 7643 7644 bool ResolveNames( 7645 SemanticsContext &context, const parser::Program &program, Scope &top) { 7646 ImplicitRulesMap implicitRulesMap; 7647 auto restorer{common::ScopedSet(sharedImplicitRulesMap, &implicitRulesMap)}; 7648 ResolveNamesVisitor{context, implicitRulesMap, top}.Walk(program); 7649 return !context.AnyFatalError(); 7650 } 7651 7652 // Processes a module (but not internal) function when it is referenced 7653 // in a specification expression in a sibling procedure. 7654 void ResolveSpecificationParts( 7655 SemanticsContext &context, const Symbol &subprogram) { 7656 auto originalLocation{context.location()}; 7657 ImplicitRulesMap implicitRulesMap; 7658 bool localImplicitRulesMap{false}; 7659 if (!sharedImplicitRulesMap) { 7660 sharedImplicitRulesMap = &implicitRulesMap; 7661 localImplicitRulesMap = true; 7662 } 7663 ResolveNamesVisitor visitor{ 7664 context, *sharedImplicitRulesMap, context.globalScope()}; 7665 const auto &details{subprogram.get<SubprogramNameDetails>()}; 7666 ProgramTree &node{details.node()}; 7667 const Scope &moduleScope{subprogram.owner()}; 7668 if (localImplicitRulesMap) { 7669 visitor.BeginScope(const_cast<Scope &>(moduleScope)); 7670 } else { 7671 visitor.SetScope(const_cast<Scope &>(moduleScope)); 7672 } 7673 visitor.ResolveSpecificationParts(node); 7674 context.set_location(std::move(originalLocation)); 7675 if (localImplicitRulesMap) { 7676 sharedImplicitRulesMap = nullptr; 7677 } 7678 } 7679 7680 } // namespace Fortran::semantics 7681