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check-declarations.cpp
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//===-- lib/Semantics/check-declarations.cpp ------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Static declaration checking
#include "check-declarations.h"
#include "pointer-assignment.h"
#include "flang/Evaluate/check-expression.h"
#include "flang/Evaluate/fold.h"
#include "flang/Evaluate/tools.h"
#include "flang/Semantics/scope.h"
#include "flang/Semantics/semantics.h"
#include "flang/Semantics/symbol.h"
#include "flang/Semantics/tools.h"
#include "flang/Semantics/type.h"
#include <algorithm>
namespace Fortran::semantics {
namespace characteristics = evaluate::characteristics;
using characteristics::DummyArgument;
using characteristics::DummyDataObject;
using characteristics::DummyProcedure;
using characteristics::FunctionResult;
using characteristics::Procedure;
class CheckHelper {
public:
explicit CheckHelper(SemanticsContext &c) : context_{c} {}
CheckHelper(SemanticsContext &c, const Scope &s) : context_{c}, scope_{&s} {}
SemanticsContext &context() { return context_; }
void Check() { Check(context_.globalScope()); }
void Check(const ParamValue &, bool canBeAssumed);
void Check(const Bound &bound) { CheckSpecExpr(bound.GetExplicit()); }
void Check(const ShapeSpec &spec) {
Check(spec.lbound());
Check(spec.ubound());
}
void Check(const ArraySpec &);
void Check(const DeclTypeSpec &, bool canHaveAssumedTypeParameters);
void Check(const Symbol &);
void Check(const Scope &);
const Procedure *Characterize(const Symbol &);
private:
template <typename A> void CheckSpecExpr(const A &x) {
evaluate::CheckSpecificationExpr(x, DEREF(scope_), foldingContext_);
}
void CheckValue(const Symbol &, const DerivedTypeSpec *);
void CheckVolatile(
const Symbol &, bool isAssociated, const DerivedTypeSpec *);
void CheckPointer(const Symbol &);
void CheckPassArg(
const Symbol &proc, const Symbol *interface, const WithPassArg &);
void CheckProcBinding(const Symbol &, const ProcBindingDetails &);
void CheckObjectEntity(const Symbol &, const ObjectEntityDetails &);
void CheckPointerInitialization(const Symbol &);
void CheckArraySpec(const Symbol &, const ArraySpec &);
void CheckProcEntity(const Symbol &, const ProcEntityDetails &);
void CheckSubprogram(const Symbol &, const SubprogramDetails &);
void CheckAssumedTypeEntity(const Symbol &, const ObjectEntityDetails &);
void CheckDerivedType(const Symbol &, const DerivedTypeDetails &);
bool CheckFinal(
const Symbol &subroutine, SourceName, const Symbol &derivedType);
bool CheckDistinguishableFinals(const Symbol &f1, SourceName f1name,
const Symbol &f2, SourceName f2name, const Symbol &derivedType);
void CheckGeneric(const Symbol &, const GenericDetails &);
void CheckHostAssoc(const Symbol &, const HostAssocDetails &);
bool CheckDefinedOperator(
SourceName, GenericKind, const Symbol &, const Procedure &);
std::optional<parser::MessageFixedText> CheckNumberOfArgs(
const GenericKind &, std::size_t);
bool CheckDefinedOperatorArg(
const SourceName &, const Symbol &, const Procedure &, std::size_t);
bool CheckDefinedAssignment(const Symbol &, const Procedure &);
bool CheckDefinedAssignmentArg(const Symbol &, const DummyArgument &, int);
void CheckSpecificsAreDistinguishable(const Symbol &, const GenericDetails &);
void CheckEquivalenceSet(const EquivalenceSet &);
void CheckBlockData(const Scope &);
void CheckGenericOps(const Scope &);
bool CheckConflicting(const Symbol &, Attr, Attr);
void WarnMissingFinal(const Symbol &);
bool InPure() const {
return innermostSymbol_ && IsPureProcedure(*innermostSymbol_);
}
bool InFunction() const {
return innermostSymbol_ && IsFunction(*innermostSymbol_);
}
template <typename... A>
void SayWithDeclaration(const Symbol &symbol, A &&...x) {
if (parser::Message * msg{messages_.Say(std::forward<A>(x)...)}) {
if (messages_.at().begin() != symbol.name().begin()) {
evaluate::AttachDeclaration(*msg, symbol);
}
}
}
bool IsResultOkToDiffer(const FunctionResult &);
SemanticsContext &context_;
evaluate::FoldingContext &foldingContext_{context_.foldingContext()};
parser::ContextualMessages &messages_{foldingContext_.messages()};
const Scope *scope_{nullptr};
bool scopeIsUninstantiatedPDT_{false};
// This symbol is the one attached to the innermost enclosing scope
// that has a symbol.
const Symbol *innermostSymbol_{nullptr};
// Cache of calls to Procedure::Characterize(Symbol)
std::map<SymbolRef, std::optional<Procedure>> characterizeCache_;
};
class DistinguishabilityHelper {
public:
DistinguishabilityHelper(SemanticsContext &context) : context_{context} {}
void Add(const Symbol &, GenericKind, const Symbol &, const Procedure &);
void Check(const Scope &);
private:
void SayNotDistinguishable(const Scope &, const SourceName &, GenericKind,
const Symbol &, const Symbol &);
void AttachDeclaration(parser::Message &, const Scope &, const Symbol &);
SemanticsContext &context_;
struct ProcedureInfo {
GenericKind kind;
const Symbol &symbol;
const Procedure &procedure;
};
std::map<SourceName, std::vector<ProcedureInfo>> nameToInfo_;
};
void CheckHelper::Check(const ParamValue &value, bool canBeAssumed) {
if (value.isAssumed()) {
if (!canBeAssumed) { // C795, C721, C726
messages_.Say(
"An assumed (*) type parameter may be used only for a (non-statement"
" function) dummy argument, associate name, named constant, or"
" external function result"_err_en_US);
}
} else {
CheckSpecExpr(value.GetExplicit());
}
}
void CheckHelper::Check(const ArraySpec &shape) {
for (const auto &spec : shape) {
Check(spec);
}
}
void CheckHelper::Check(
const DeclTypeSpec &type, bool canHaveAssumedTypeParameters) {
if (type.category() == DeclTypeSpec::Character) {
Check(type.characterTypeSpec().length(), canHaveAssumedTypeParameters);
} else if (const DerivedTypeSpec * derived{type.AsDerived()}) {
for (auto &parm : derived->parameters()) {
Check(parm.second, canHaveAssumedTypeParameters);
}
}
}
void CheckHelper::Check(const Symbol &symbol) {
if (context_.HasError(symbol)) {
return;
}
auto restorer{messages_.SetLocation(symbol.name())};
context_.set_location(symbol.name());
const DeclTypeSpec *type{symbol.GetType()};
const DerivedTypeSpec *derived{type ? type->AsDerived() : nullptr};
bool isAssociated{symbol.has<UseDetails>() || symbol.has<HostAssocDetails>()};
if (symbol.attrs().test(Attr::VOLATILE)) {
CheckVolatile(symbol, isAssociated, derived);
}
if (isAssociated) {
if (const auto *details{symbol.detailsIf<HostAssocDetails>()}) {
CheckHostAssoc(symbol, *details);
}
return; // no other checks on associated symbols
}
if (IsPointer(symbol)) {
CheckPointer(symbol);
}
std::visit(
common::visitors{
[&](const ProcBindingDetails &x) { CheckProcBinding(symbol, x); },
[&](const ObjectEntityDetails &x) { CheckObjectEntity(symbol, x); },
[&](const ProcEntityDetails &x) { CheckProcEntity(symbol, x); },
[&](const SubprogramDetails &x) { CheckSubprogram(symbol, x); },
[&](const DerivedTypeDetails &x) { CheckDerivedType(symbol, x); },
[&](const GenericDetails &x) { CheckGeneric(symbol, x); },
[](const auto &) {},
},
symbol.details());
if (InPure()) {
if (IsSaved(symbol)) {
messages_.Say(
"A pure subprogram may not have a variable with the SAVE attribute"_err_en_US);
}
if (symbol.attrs().test(Attr::VOLATILE)) {
messages_.Say(
"A pure subprogram may not have a variable with the VOLATILE attribute"_err_en_US);
}
if (IsProcedure(symbol) && !IsPureProcedure(symbol) && IsDummy(symbol)) {
messages_.Say(
"A dummy procedure of a pure subprogram must be pure"_err_en_US);
}
if (!IsDummy(symbol) && !IsFunctionResult(symbol)) {
if (IsPolymorphicAllocatable(symbol)) {
SayWithDeclaration(symbol,
"Deallocation of polymorphic object '%s' is not permitted in a pure subprogram"_err_en_US,
symbol.name());
} else if (derived) {
if (auto bad{FindPolymorphicAllocatableUltimateComponent(*derived)}) {
SayWithDeclaration(*bad,
"Deallocation of polymorphic object '%s%s' is not permitted in a pure subprogram"_err_en_US,
symbol.name(), bad.BuildResultDesignatorName());
}
}
}
}
if (type) { // Section 7.2, paragraph 7
bool canHaveAssumedParameter{IsNamedConstant(symbol) ||
(IsAssumedLengthCharacter(symbol) && // C722
IsExternal(symbol)) ||
symbol.test(Symbol::Flag::ParentComp)};
if (!IsStmtFunctionDummy(symbol)) { // C726
if (const auto *object{symbol.detailsIf<ObjectEntityDetails>()}) {
canHaveAssumedParameter |= object->isDummy() ||
(object->isFuncResult() &&
type->category() == DeclTypeSpec::Character) ||
IsStmtFunctionResult(symbol); // Avoids multiple messages
} else {
canHaveAssumedParameter |= symbol.has<AssocEntityDetails>();
}
}
Check(*type, canHaveAssumedParameter);
if (InPure() && InFunction() && IsFunctionResult(symbol)) {
if (derived && HasImpureFinal(*derived)) { // C1584
messages_.Say(
"Result of pure function may not have an impure FINAL subroutine"_err_en_US);
}
if (type->IsPolymorphic() && IsAllocatable(symbol)) { // C1585
messages_.Say(
"Result of pure function may not be both polymorphic and ALLOCATABLE"_err_en_US);
}
if (derived) {
if (auto bad{FindPolymorphicAllocatableUltimateComponent(*derived)}) {
SayWithDeclaration(*bad,
"Result of pure function may not have polymorphic ALLOCATABLE ultimate component '%s'"_err_en_US,
bad.BuildResultDesignatorName());
}
}
}
}
if (IsAssumedLengthCharacter(symbol) && IsExternal(symbol)) { // C723
if (symbol.attrs().test(Attr::RECURSIVE)) {
messages_.Say(
"An assumed-length CHARACTER(*) function cannot be RECURSIVE"_err_en_US);
}
if (symbol.Rank() > 0) {
messages_.Say(
"An assumed-length CHARACTER(*) function cannot return an array"_err_en_US);
}
if (symbol.attrs().test(Attr::PURE)) {
messages_.Say(
"An assumed-length CHARACTER(*) function cannot be PURE"_err_en_US);
}
if (symbol.attrs().test(Attr::ELEMENTAL)) {
messages_.Say(
"An assumed-length CHARACTER(*) function cannot be ELEMENTAL"_err_en_US);
}
if (const Symbol * result{FindFunctionResult(symbol)}) {
if (IsPointer(*result)) {
messages_.Say(
"An assumed-length CHARACTER(*) function cannot return a POINTER"_err_en_US);
}
}
}
if (symbol.attrs().test(Attr::VALUE)) {
CheckValue(symbol, derived);
}
if (symbol.attrs().test(Attr::CONTIGUOUS) && IsPointer(symbol) &&
symbol.Rank() == 0) { // C830
messages_.Say("CONTIGUOUS POINTER must be an array"_err_en_US);
}
if (IsDummy(symbol)) {
if (IsNamedConstant(symbol)) {
messages_.Say(
"A dummy argument may not also be a named constant"_err_en_US);
}
if (IsSaved(symbol)) {
messages_.Say(
"A dummy argument may not have the SAVE attribute"_err_en_US);
}
} else if (IsFunctionResult(symbol)) {
if (IsSaved(symbol)) {
messages_.Say(
"A function result may not have the SAVE attribute"_err_en_US);
}
}
if (symbol.owner().IsDerivedType() &&
(symbol.attrs().test(Attr::CONTIGUOUS) &&
!(IsPointer(symbol) && symbol.Rank() > 0))) { // C752
messages_.Say(
"A CONTIGUOUS component must be an array with the POINTER attribute"_err_en_US);
}
if (symbol.owner().IsModule() && IsAutomatic(symbol)) {
messages_.Say(
"Automatic data object '%s' may not appear in the specification part"
" of a module"_err_en_US,
symbol.name());
}
}
void CheckHelper::CheckValue(
const Symbol &symbol, const DerivedTypeSpec *derived) { // C863 - C865
if (!IsDummy(symbol)) {
messages_.Say(
"VALUE attribute may apply only to a dummy argument"_err_en_US);
}
if (IsProcedure(symbol)) {
messages_.Say(
"VALUE attribute may apply only to a dummy data object"_err_en_US);
}
if (IsAssumedSizeArray(symbol)) {
messages_.Say(
"VALUE attribute may not apply to an assumed-size array"_err_en_US);
}
if (IsCoarray(symbol)) {
messages_.Say("VALUE attribute may not apply to a coarray"_err_en_US);
}
if (IsAllocatable(symbol)) {
messages_.Say("VALUE attribute may not apply to an ALLOCATABLE"_err_en_US);
} else if (IsPointer(symbol)) {
messages_.Say("VALUE attribute may not apply to a POINTER"_err_en_US);
}
if (IsIntentInOut(symbol)) {
messages_.Say(
"VALUE attribute may not apply to an INTENT(IN OUT) argument"_err_en_US);
} else if (IsIntentOut(symbol)) {
messages_.Say(
"VALUE attribute may not apply to an INTENT(OUT) argument"_err_en_US);
}
if (symbol.attrs().test(Attr::VOLATILE)) {
messages_.Say("VALUE attribute may not apply to a VOLATILE"_err_en_US);
}
if (innermostSymbol_ && IsBindCProcedure(*innermostSymbol_) &&
IsOptional(symbol)) {
messages_.Say(
"VALUE attribute may not apply to an OPTIONAL in a BIND(C) procedure"_err_en_US);
}
if (derived) {
if (FindCoarrayUltimateComponent(*derived)) {
messages_.Say(
"VALUE attribute may not apply to a type with a coarray ultimate component"_err_en_US);
}
}
}
void CheckHelper::CheckAssumedTypeEntity( // C709
const Symbol &symbol, const ObjectEntityDetails &details) {
if (const DeclTypeSpec * type{symbol.GetType()};
type && type->category() == DeclTypeSpec::TypeStar) {
if (!IsDummy(symbol)) {
messages_.Say(
"Assumed-type entity '%s' must be a dummy argument"_err_en_US,
symbol.name());
} else {
if (symbol.attrs().test(Attr::ALLOCATABLE)) {
messages_.Say("Assumed-type argument '%s' cannot have the ALLOCATABLE"
" attribute"_err_en_US,
symbol.name());
}
if (symbol.attrs().test(Attr::POINTER)) {
messages_.Say("Assumed-type argument '%s' cannot have the POINTER"
" attribute"_err_en_US,
symbol.name());
}
if (symbol.attrs().test(Attr::VALUE)) {
messages_.Say("Assumed-type argument '%s' cannot have the VALUE"
" attribute"_err_en_US,
symbol.name());
}
if (symbol.attrs().test(Attr::INTENT_OUT)) {
messages_.Say(
"Assumed-type argument '%s' cannot be INTENT(OUT)"_err_en_US,
symbol.name());
}
if (IsCoarray(symbol)) {
messages_.Say(
"Assumed-type argument '%s' cannot be a coarray"_err_en_US,
symbol.name());
}
if (details.IsArray() && details.shape().IsExplicitShape()) {
messages_.Say(
"Assumed-type array argument 'arg8' must be assumed shape,"
" assumed size, or assumed rank"_err_en_US,
symbol.name());
}
}
}
}
void CheckHelper::CheckObjectEntity(
const Symbol &symbol, const ObjectEntityDetails &details) {
CheckArraySpec(symbol, details.shape());
Check(details.shape());
Check(details.coshape());
CheckAssumedTypeEntity(symbol, details);
WarnMissingFinal(symbol);
if (!details.coshape().empty()) {
bool isDeferredShape{details.coshape().IsDeferredShape()};
if (IsAllocatable(symbol)) {
if (!isDeferredShape) { // C827
messages_.Say("'%s' is an ALLOCATABLE coarray and must have a deferred"
" coshape"_err_en_US,
symbol.name());
}
} else if (symbol.owner().IsDerivedType()) { // C746
std::string deferredMsg{
isDeferredShape ? "" : " and have a deferred coshape"};
messages_.Say("Component '%s' is a coarray and must have the ALLOCATABLE"
" attribute%s"_err_en_US,
symbol.name(), deferredMsg);
} else {
if (!details.coshape().IsAssumedSize()) { // C828
messages_.Say(
"Component '%s' is a non-ALLOCATABLE coarray and must have"
" an explicit coshape"_err_en_US,
symbol.name());
}
}
}
if (details.isDummy()) {
if (symbol.attrs().test(Attr::INTENT_OUT)) {
if (FindUltimateComponent(symbol, [](const Symbol &x) {
return IsCoarray(x) && IsAllocatable(x);
})) { // C846
messages_.Say(
"An INTENT(OUT) dummy argument may not be, or contain, an ALLOCATABLE coarray"_err_en_US);
}
if (IsOrContainsEventOrLockComponent(symbol)) { // C847
messages_.Say(
"An INTENT(OUT) dummy argument may not be, or contain, EVENT_TYPE or LOCK_TYPE"_err_en_US);
}
}
if (InPure() && !IsStmtFunction(DEREF(innermostSymbol_)) &&
!IsPointer(symbol) && !IsIntentIn(symbol) &&
!symbol.attrs().test(Attr::VALUE)) {
if (InFunction()) { // C1583
messages_.Say(
"non-POINTER dummy argument of pure function must be INTENT(IN) or VALUE"_err_en_US);
} else if (IsIntentOut(symbol)) {
if (const DeclTypeSpec * type{details.type()}) {
if (type && type->IsPolymorphic()) { // C1588
messages_.Say(
"An INTENT(OUT) dummy argument of a pure subroutine may not be polymorphic"_err_en_US);
} else if (const DerivedTypeSpec * derived{type->AsDerived()}) {
if (FindUltimateComponent(*derived, [](const Symbol &x) {
const DeclTypeSpec *type{x.GetType()};
return type && type->IsPolymorphic();
})) { // C1588
messages_.Say(
"An INTENT(OUT) dummy argument of a pure subroutine may not have a polymorphic ultimate component"_err_en_US);
}
if (HasImpureFinal(*derived)) { // C1587
messages_.Say(
"An INTENT(OUT) dummy argument of a pure subroutine may not have an impure FINAL subroutine"_err_en_US);
}
}
}
} else if (!IsIntentInOut(symbol)) { // C1586
messages_.Say(
"non-POINTER dummy argument of pure subroutine must have INTENT() or VALUE attribute"_err_en_US);
}
}
}
if (IsStaticallyInitialized(symbol, true /* ignore DATA inits */)) { // C808
CheckPointerInitialization(symbol);
if (IsAutomatic(symbol)) {
messages_.Say(
"An automatic variable or component must not be initialized"_err_en_US);
} else if (IsDummy(symbol)) {
messages_.Say("A dummy argument must not be initialized"_err_en_US);
} else if (IsFunctionResult(symbol)) {
messages_.Say("A function result must not be initialized"_err_en_US);
} else if (IsInBlankCommon(symbol)) {
messages_.Say(
"A variable in blank COMMON should not be initialized"_en_US);
}
}
if (symbol.owner().kind() == Scope::Kind::BlockData) {
if (IsAllocatable(symbol)) {
messages_.Say(
"An ALLOCATABLE variable may not appear in a BLOCK DATA subprogram"_err_en_US);
} else if (IsInitialized(symbol) && !FindCommonBlockContaining(symbol)) {
messages_.Say(
"An initialized variable in BLOCK DATA must be in a COMMON block"_err_en_US);
}
}
if (const DeclTypeSpec * type{details.type()}) { // C708
if (type->IsPolymorphic() &&
!(type->IsAssumedType() || IsAllocatableOrPointer(symbol) ||
IsDummy(symbol))) {
messages_.Say("CLASS entity '%s' must be a dummy argument or have "
"ALLOCATABLE or POINTER attribute"_err_en_US,
symbol.name());
}
}
}
void CheckHelper::CheckPointerInitialization(const Symbol &symbol) {
if (IsPointer(symbol) && !context_.HasError(symbol) &&
!scopeIsUninstantiatedPDT_) {
if (const auto *object{symbol.detailsIf<ObjectEntityDetails>()}) {
if (object->init()) { // C764, C765; C808
if (auto dyType{evaluate::DynamicType::From(symbol)}) {
if (auto designator{evaluate::TypedWrapper<evaluate::Designator>(
*dyType, evaluate::DataRef{symbol})}) {
auto restorer{messages_.SetLocation(symbol.name())};
context_.set_location(symbol.name());
CheckInitialTarget(foldingContext_, *designator, *object->init());
}
}
}
} else if (const auto *proc{symbol.detailsIf<ProcEntityDetails>()}) {
if (proc->init() && *proc->init()) {
// C1519 - must be nonelemental external or module procedure,
// or an unrestricted specific intrinsic function.
const Symbol &ultimate{(*proc->init())->GetUltimate()};
if (ultimate.attrs().test(Attr::INTRINSIC)) {
} else if (!ultimate.attrs().test(Attr::EXTERNAL) &&
ultimate.owner().kind() != Scope::Kind::Module) {
context_.Say("Procedure pointer '%s' initializer '%s' is neither "
"an external nor a module procedure"_err_en_US,
symbol.name(), ultimate.name());
} else if (ultimate.attrs().test(Attr::ELEMENTAL)) {
context_.Say("Procedure pointer '%s' cannot be initialized with the "
"elemental procedure '%s"_err_en_US,
symbol.name(), ultimate.name());
} else {
// TODO: Check the "shalls" in the 15.4.3.6 paragraphs 7-10.
}
}
}
}
}
// The six different kinds of array-specs:
// array-spec -> explicit-shape-list | deferred-shape-list
// | assumed-shape-list | implied-shape-list
// | assumed-size | assumed-rank
// explicit-shape -> [ lb : ] ub
// deferred-shape -> :
// assumed-shape -> [ lb ] :
// implied-shape -> [ lb : ] *
// assumed-size -> [ explicit-shape-list , ] [ lb : ] *
// assumed-rank -> ..
// Note:
// - deferred-shape is also an assumed-shape
// - A single "*" or "lb:*" might be assumed-size or implied-shape-list
void CheckHelper::CheckArraySpec(
const Symbol &symbol, const ArraySpec &arraySpec) {
if (arraySpec.Rank() == 0) {
return;
}
bool isExplicit{arraySpec.IsExplicitShape()};
bool isDeferred{arraySpec.IsDeferredShape()};
bool isImplied{arraySpec.IsImpliedShape()};
bool isAssumedShape{arraySpec.IsAssumedShape()};
bool isAssumedSize{arraySpec.IsAssumedSize()};
bool isAssumedRank{arraySpec.IsAssumedRank()};
std::optional<parser::MessageFixedText> msg;
if (symbol.test(Symbol::Flag::CrayPointee) && !isExplicit && !isAssumedSize) {
msg = "Cray pointee '%s' must have must have explicit shape or"
" assumed size"_err_en_US;
} else if (IsAllocatableOrPointer(symbol) && !isDeferred && !isAssumedRank) {
if (symbol.owner().IsDerivedType()) { // C745
if (IsAllocatable(symbol)) {
msg = "Allocatable array component '%s' must have"
" deferred shape"_err_en_US;
} else {
msg = "Array pointer component '%s' must have deferred shape"_err_en_US;
}
} else {
if (IsAllocatable(symbol)) { // C832
msg = "Allocatable array '%s' must have deferred shape or"
" assumed rank"_err_en_US;
} else {
msg = "Array pointer '%s' must have deferred shape or"
" assumed rank"_err_en_US;
}
}
} else if (IsDummy(symbol)) {
if (isImplied && !isAssumedSize) { // C836
msg = "Dummy array argument '%s' may not have implied shape"_err_en_US;
}
} else if (isAssumedShape && !isDeferred) {
msg = "Assumed-shape array '%s' must be a dummy argument"_err_en_US;
} else if (isAssumedSize && !isImplied) { // C833
msg = "Assumed-size array '%s' must be a dummy argument"_err_en_US;
} else if (isAssumedRank) { // C837
msg = "Assumed-rank array '%s' must be a dummy argument"_err_en_US;
} else if (isImplied) {
if (!IsNamedConstant(symbol)) { // C836
msg = "Implied-shape array '%s' must be a named constant"_err_en_US;
}
} else if (IsNamedConstant(symbol)) {
if (!isExplicit && !isImplied) {
msg = "Named constant '%s' array must have constant or"
" implied shape"_err_en_US;
}
} else if (!IsAllocatableOrPointer(symbol) && !isExplicit) {
if (symbol.owner().IsDerivedType()) { // C749
msg = "Component array '%s' without ALLOCATABLE or POINTER attribute must"
" have explicit shape"_err_en_US;
} else { // C816
msg = "Array '%s' without ALLOCATABLE or POINTER attribute must have"
" explicit shape"_err_en_US;
}
}
if (msg) {
context_.Say(std::move(*msg), symbol.name());
}
}
void CheckHelper::CheckProcEntity(
const Symbol &symbol, const ProcEntityDetails &details) {
if (details.isDummy()) {
const Symbol *interface{details.interface().symbol()};
if (!symbol.attrs().test(Attr::INTRINSIC) &&
(symbol.attrs().test(Attr::ELEMENTAL) ||
(interface && !interface->attrs().test(Attr::INTRINSIC) &&
interface->attrs().test(Attr::ELEMENTAL)))) {
// There's no explicit constraint or "shall" that we can find in the
// standard for this check, but it seems to be implied in multiple
// sites, and ELEMENTAL non-intrinsic actual arguments *are*
// explicitly forbidden. But we allow "PROCEDURE(SIN)::dummy"
// because it is explicitly legal to *pass* the specific intrinsic
// function SIN as an actual argument.
messages_.Say("A dummy procedure may not be ELEMENTAL"_err_en_US);
}
} else if (symbol.owner().IsDerivedType()) {
if (!symbol.attrs().test(Attr::POINTER)) { // C756
const auto &name{symbol.name()};
messages_.Say(name,
"Procedure component '%s' must have POINTER attribute"_err_en_US,
name);
}
CheckPassArg(symbol, details.interface().symbol(), details);
}
if (symbol.attrs().test(Attr::POINTER)) {
CheckPointerInitialization(symbol);
if (const Symbol * interface{details.interface().symbol()}) {
if (interface->attrs().test(Attr::ELEMENTAL) &&
!interface->attrs().test(Attr::INTRINSIC)) {
messages_.Say("Procedure pointer '%s' may not be ELEMENTAL"_err_en_US,
symbol.name()); // C1517
}
}
} else if (symbol.attrs().test(Attr::SAVE)) {
messages_.Say(
"Procedure '%s' with SAVE attribute must also have POINTER attribute"_err_en_US,
symbol.name());
}
}
// When a module subprogram has the MODULE prefix the following must match
// with the corresponding separate module procedure interface body:
// - C1549: characteristics and dummy argument names
// - C1550: binding label
// - C1551: NON_RECURSIVE prefix
class SubprogramMatchHelper {
public:
explicit SubprogramMatchHelper(CheckHelper &checkHelper)
: checkHelper{checkHelper} {}
void Check(const Symbol &, const Symbol &);
private:
SemanticsContext &context() { return checkHelper.context(); }
void CheckDummyArg(const Symbol &, const Symbol &, const DummyArgument &,
const DummyArgument &);
void CheckDummyDataObject(const Symbol &, const Symbol &,
const DummyDataObject &, const DummyDataObject &);
void CheckDummyProcedure(const Symbol &, const Symbol &,
const DummyProcedure &, const DummyProcedure &);
bool CheckSameIntent(
const Symbol &, const Symbol &, common::Intent, common::Intent);
template <typename... A>
void Say(
const Symbol &, const Symbol &, parser::MessageFixedText &&, A &&...);
template <typename ATTRS>
bool CheckSameAttrs(const Symbol &, const Symbol &, ATTRS, ATTRS);
bool ShapesAreCompatible(const DummyDataObject &, const DummyDataObject &);
evaluate::Shape FoldShape(const evaluate::Shape &);
std::string AsFortran(DummyDataObject::Attr attr) {
return parser::ToUpperCaseLetters(DummyDataObject::EnumToString(attr));
}
std::string AsFortran(DummyProcedure::Attr attr) {
return parser::ToUpperCaseLetters(DummyProcedure::EnumToString(attr));
}
CheckHelper &checkHelper;
};
// 15.6.2.6 para 3 - can the result of an ENTRY differ from its function?
bool CheckHelper::IsResultOkToDiffer(const FunctionResult &result) {
if (result.attrs.test(FunctionResult::Attr::Allocatable) ||
result.attrs.test(FunctionResult::Attr::Pointer)) {
return false;
}
const auto *typeAndShape{result.GetTypeAndShape()};
if (!typeAndShape || typeAndShape->Rank() != 0) {
return false;
}
auto category{typeAndShape->type().category()};
if (category == TypeCategory::Character ||
category == TypeCategory::Derived) {
return false;
}
int kind{typeAndShape->type().kind()};
return kind == context_.GetDefaultKind(category) ||
(category == TypeCategory::Real &&
kind == context_.doublePrecisionKind());
}
void CheckHelper::CheckSubprogram(
const Symbol &symbol, const SubprogramDetails &details) {
if (const Symbol * iface{FindSeparateModuleSubprogramInterface(&symbol)}) {
SubprogramMatchHelper{*this}.Check(symbol, *iface);
}
if (const Scope * entryScope{details.entryScope()}) {
// ENTRY 15.6.2.6, esp. C1571
std::optional<parser::MessageFixedText> error;
const Symbol *subprogram{entryScope->symbol()};
const SubprogramDetails *subprogramDetails{nullptr};
if (subprogram) {
subprogramDetails = subprogram->detailsIf<SubprogramDetails>();
}
if (entryScope->kind() != Scope::Kind::Subprogram) {
error = "ENTRY may appear only in a subroutine or function"_err_en_US;
} else if (!(entryScope->parent().IsGlobal() ||
entryScope->parent().IsModule() ||
entryScope->parent().IsSubmodule())) {
error = "ENTRY may not appear in an internal subprogram"_err_en_US;
} else if (FindSeparateModuleSubprogramInterface(subprogram)) {
error = "ENTRY may not appear in a separate module procedure"_err_en_US;
} else if (subprogramDetails && details.isFunction() &&
subprogramDetails->isFunction()) {
auto result{FunctionResult::Characterize(
details.result(), context_.foldingContext())};
auto subpResult{FunctionResult::Characterize(
subprogramDetails->result(), context_.foldingContext())};
if (result && subpResult && *result != *subpResult &&
(!IsResultOkToDiffer(*result) || !IsResultOkToDiffer(*subpResult))) {
error =
"Result of ENTRY is not compatible with result of containing function"_err_en_US;
}
}
if (error) {
if (auto *msg{messages_.Say(symbol.name(), *error)}) {
if (subprogram) {
msg->Attach(subprogram->name(), "Containing subprogram"_en_US);
}
}
}
}
}
void CheckHelper::CheckDerivedType(
const Symbol &derivedType, const DerivedTypeDetails &details) {
const Scope *scope{derivedType.scope()};
if (!scope) {
CHECK(details.isForwardReferenced());
return;
}
CHECK(scope->symbol() == &derivedType);
CHECK(scope->IsDerivedType());
if (derivedType.attrs().test(Attr::ABSTRACT) && // C734
(derivedType.attrs().test(Attr::BIND_C) || details.sequence())) {
messages_.Say("An ABSTRACT derived type must be extensible"_err_en_US);
}
if (const DeclTypeSpec * parent{FindParentTypeSpec(derivedType)}) {
const DerivedTypeSpec *parentDerived{parent->AsDerived()};
if (!IsExtensibleType(parentDerived)) { // C705
messages_.Say("The parent type is not extensible"_err_en_US);
}
if (!derivedType.attrs().test(Attr::ABSTRACT) && parentDerived &&
parentDerived->typeSymbol().attrs().test(Attr::ABSTRACT)) {
ScopeComponentIterator components{*parentDerived};
for (const Symbol &component : components) {
if (component.attrs().test(Attr::DEFERRED)) {
if (scope->FindComponent(component.name()) == &component) {
SayWithDeclaration(component,
"Non-ABSTRACT extension of ABSTRACT derived type '%s' lacks a binding for DEFERRED procedure '%s'"_err_en_US,
parentDerived->typeSymbol().name(), component.name());
}
}
}
}
DerivedTypeSpec derived{derivedType.name(), derivedType};
derived.set_scope(*scope);
if (FindCoarrayUltimateComponent(derived) && // C736
!(parentDerived && FindCoarrayUltimateComponent(*parentDerived))) {
messages_.Say(
"Type '%s' has a coarray ultimate component so the type at the base "
"of its type extension chain ('%s') must be a type that has a "
"coarray ultimate component"_err_en_US,
derivedType.name(), scope->GetDerivedTypeBase().GetSymbol()->name());
}
if (FindEventOrLockPotentialComponent(derived) && // C737
!(FindEventOrLockPotentialComponent(*parentDerived) ||
IsEventTypeOrLockType(parentDerived))) {
messages_.Say(
"Type '%s' has an EVENT_TYPE or LOCK_TYPE component, so the type "
"at the base of its type extension chain ('%s') must either have an "
"EVENT_TYPE or LOCK_TYPE component, or be EVENT_TYPE or "
"LOCK_TYPE"_err_en_US,
derivedType.name(), scope->GetDerivedTypeBase().GetSymbol()->name());
}
}
if (HasIntrinsicTypeName(derivedType)) { // C729
messages_.Say("A derived type name cannot be the name of an intrinsic"
" type"_err_en_US);
}
std::map<SourceName, SymbolRef> previous;
for (const auto &pair : details.finals()) {
SourceName source{pair.first};
const Symbol &ref{*pair.second};
if (CheckFinal(ref, source, derivedType) &&
std::all_of(previous.begin(), previous.end(),
[&](std::pair<SourceName, SymbolRef> prev) {
return CheckDistinguishableFinals(
ref, source, *prev.second, prev.first, derivedType);
})) {
previous.emplace(source, ref);
}
}
}
// C786
bool CheckHelper::CheckFinal(
const Symbol &subroutine, SourceName finalName, const Symbol &derivedType) {
if (!IsModuleProcedure(subroutine)) {
SayWithDeclaration(subroutine, finalName,
"FINAL subroutine '%s' of derived type '%s' must be a module procedure"_err_en_US,
subroutine.name(), derivedType.name());
return false;
}
const Procedure *proc{Characterize(subroutine)};
if (!proc) {
return false; // error recovery
}
if (!proc->IsSubroutine()) {
SayWithDeclaration(subroutine, finalName,
"FINAL subroutine '%s' of derived type '%s' must be a subroutine"_err_en_US,
subroutine.name(), derivedType.name());
return false;
}
if (proc->dummyArguments.size() != 1) {
SayWithDeclaration(subroutine, finalName,
"FINAL subroutine '%s' of derived type '%s' must have a single dummy argument"_err_en_US,
subroutine.name(), derivedType.name());
return false;
}
const auto &arg{proc->dummyArguments[0]};
const Symbol *errSym{&subroutine};
if (const auto *details{subroutine.detailsIf<SubprogramDetails>()}) {
if (!details->dummyArgs().empty()) {
if (const Symbol * argSym{details->dummyArgs()[0]}) {
errSym = argSym;
}
}
}
const auto *ddo{std::get_if<DummyDataObject>(&arg.u)};
if (!ddo) {
SayWithDeclaration(subroutine, finalName,
"FINAL subroutine '%s' of derived type '%s' must have a single dummy argument that is a data object"_err_en_US,
subroutine.name(), derivedType.name());
return false;
}
bool ok{true};
if (arg.IsOptional()) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have an OPTIONAL dummy argument"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
}
if (ddo->attrs.test(DummyDataObject::Attr::Allocatable)) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have an ALLOCATABLE dummy argument"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
}
if (ddo->attrs.test(DummyDataObject::Attr::Pointer)) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have a POINTER dummy argument"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
}
if (ddo->intent == common::Intent::Out) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have a dummy argument with INTENT(OUT)"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
}
if (ddo->attrs.test(DummyDataObject::Attr::Value)) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have a dummy argument with the VALUE attribute"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
}
if (ddo->type.corank() > 0) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have a coarray dummy argument"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
}
if (ddo->type.type().IsPolymorphic()) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must not have a polymorphic dummy argument"_err_en_US,
subroutine.name(), derivedType.name());
ok = false;
} else if (ddo->type.type().category() != TypeCategory::Derived ||
&ddo->type.type().GetDerivedTypeSpec().typeSymbol() != &derivedType) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must have a TYPE(%s) dummy argument"_err_en_US,
subroutine.name(), derivedType.name(), derivedType.name());
ok = false;
} else { // check that all LEN type parameters are assumed
for (auto ref : OrderParameterDeclarations(derivedType)) {
if (IsLenTypeParameter(*ref)) {
const auto *value{
ddo->type.type().GetDerivedTypeSpec().FindParameter(ref->name())};
if (!value || !value->isAssumed()) {
SayWithDeclaration(*errSym, finalName,
"FINAL subroutine '%s' of derived type '%s' must have a dummy argument with an assumed LEN type parameter '%s=*'"_err_en_US,
subroutine.name(), derivedType.name(), ref->name());
ok = false;
}
}
}
}
return ok;
}
bool CheckHelper::CheckDistinguishableFinals(const Symbol &f1,
SourceName f1Name, const Symbol &f2, SourceName f2Name,
const Symbol &derivedType) {
const Procedure *p1{Characterize(f1)};
const Procedure *p2{Characterize(f2)};
if (p1 && p2) {
if (characteristics::Distinguishable(*p1, *p2)) {
return true;
}
if (auto *msg{messages_.Say(f1Name,
"FINAL subroutines '%s' and '%s' of derived type '%s' cannot be distinguished by rank or KIND type parameter value"_err_en_US,
f1Name, f2Name, derivedType.name())}) {
msg->Attach(f2Name, "FINAL declaration of '%s'"_en_US, f2.name())
.Attach(f1.name(), "Definition of '%s'"_en_US, f1Name)
.Attach(f2.name(), "Definition of '%s'"_en_US, f2Name);
}
}
return false;
}
void CheckHelper::CheckHostAssoc(
const Symbol &symbol, const HostAssocDetails &details) {
const Symbol &hostSymbol{details.symbol()};
if (hostSymbol.test(Symbol::Flag::ImplicitOrError)) {
if (details.implicitOrSpecExprError) {
messages_.Say("Implicitly typed local entity '%s' not allowed in"
" specification expression"_err_en_US,
symbol.name());
} else if (details.implicitOrExplicitTypeError) {
messages_.Say(
"No explicit type declared for '%s'"_err_en_US, symbol.name());
}
}
}
void CheckHelper::CheckGeneric(
const Symbol &symbol, const GenericDetails &details) {
CheckSpecificsAreDistinguishable(symbol, details);
}
// Check that the specifics of this generic are distinguishable from each other
void CheckHelper::CheckSpecificsAreDistinguishable(
const Symbol &generic, const GenericDetails &details) {
GenericKind kind{details.kind()};
const SymbolVector &specifics{details.specificProcs()};
std::size_t count{specifics.size()};
if (count < 2 || !kind.IsName()) {
return;