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check-call.cpp
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check-call.cpp
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//===-- lib/Semantics/check-call.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
//
//===----------------------------------------------------------------------===//
#include "check-call.h"
#include "definable.h"
#include "pointer-assignment.h"
#include "flang/Evaluate/characteristics.h"
#include "flang/Evaluate/check-expression.h"
#include "flang/Evaluate/shape.h"
#include "flang/Evaluate/tools.h"
#include "flang/Parser/characters.h"
#include "flang/Parser/message.h"
#include "flang/Semantics/scope.h"
#include "flang/Semantics/tools.h"
#include <map>
#include <string>
using namespace Fortran::parser::literals;
namespace characteristics = Fortran::evaluate::characteristics;
namespace Fortran::semantics {
static void CheckImplicitInterfaceArg(evaluate::ActualArgument &arg,
parser::ContextualMessages &messages, evaluate::FoldingContext &context) {
auto restorer{
messages.SetLocation(arg.sourceLocation().value_or(messages.at()))};
if (auto kw{arg.keyword()}) {
messages.Say(*kw,
"Keyword '%s=' may not appear in a reference to a procedure with an implicit interface"_err_en_US,
*kw);
}
if (auto type{arg.GetType()}) {
if (type->IsAssumedType()) {
messages.Say(
"Assumed type argument requires an explicit interface"_err_en_US);
} else if (type->IsPolymorphic()) {
messages.Say(
"Polymorphic argument requires an explicit interface"_err_en_US);
} else if (const DerivedTypeSpec * derived{GetDerivedTypeSpec(type)}) {
if (!derived->parameters().empty()) {
messages.Say(
"Parameterized derived type argument requires an explicit interface"_err_en_US);
}
}
}
if (const auto *expr{arg.UnwrapExpr()}) {
if (IsBOZLiteral(*expr)) {
messages.Say("BOZ argument requires an explicit interface"_err_en_US);
} else if (evaluate::IsNullPointer(*expr)) {
messages.Say(
"Null pointer argument requires an explicit interface"_err_en_US);
} else if (auto named{evaluate::ExtractNamedEntity(*expr)}) {
const Symbol &symbol{named->GetLastSymbol()};
if (symbol.Corank() > 0) {
messages.Say(
"Coarray argument requires an explicit interface"_err_en_US);
}
if (const auto *details{symbol.detailsIf<ObjectEntityDetails>()}) {
if (details->IsAssumedRank()) {
messages.Say(
"Assumed rank argument requires an explicit interface"_err_en_US);
}
}
if (symbol.attrs().test(Attr::ASYNCHRONOUS)) {
messages.Say(
"ASYNCHRONOUS argument requires an explicit interface"_err_en_US);
}
if (symbol.attrs().test(Attr::VOLATILE)) {
messages.Say(
"VOLATILE argument requires an explicit interface"_err_en_US);
}
} else if (auto argChars{characteristics::DummyArgument::FromActual(
"actual argument", *expr, context)}) {
const auto *argProcDesignator{
std::get_if<evaluate::ProcedureDesignator>(&expr->u)};
if (const auto *argProcSymbol{
argProcDesignator ? argProcDesignator->GetSymbol() : nullptr}) {
if (!argChars->IsTypelessIntrinsicDummy() && argProcDesignator &&
argProcDesignator->IsElemental()) { // C1533
evaluate::SayWithDeclaration(messages, *argProcSymbol,
"Non-intrinsic ELEMENTAL procedure '%s' may not be passed as an actual argument"_err_en_US,
argProcSymbol->name());
} else if (const auto *subp{argProcSymbol->GetUltimate()
.detailsIf<SubprogramDetails>()}) {
if (subp->stmtFunction()) {
evaluate::SayWithDeclaration(messages, *argProcSymbol,
"Statement function '%s' may not be passed as an actual argument"_err_en_US,
argProcSymbol->name());
}
}
}
}
}
}
// When a CHARACTER actual argument is known to be short,
// we extend it on the right with spaces and a warning if
// possible. When it is long, and not required to be equal,
// the usage conforms to the standard and no warning is needed.
static void CheckCharacterActual(evaluate::Expr<evaluate::SomeType> &actual,
const characteristics::DummyDataObject &dummy,
characteristics::TypeAndShape &actualType, SemanticsContext &context,
parser::ContextualMessages &messages) {
if (dummy.type.type().category() == TypeCategory::Character &&
actualType.type().category() == TypeCategory::Character &&
dummy.type.type().kind() == actualType.type().kind()) {
if (dummy.type.LEN() && actualType.LEN()) {
evaluate::FoldingContext &foldingContext{context.foldingContext()};
auto dummyLength{
ToInt64(Fold(foldingContext, common::Clone(*dummy.type.LEN())))};
auto actualLength{
ToInt64(Fold(foldingContext, common::Clone(*actualType.LEN())))};
if (dummyLength && actualLength && *actualLength != *dummyLength) {
if (dummy.attrs.test(
characteristics::DummyDataObject::Attr::Allocatable) ||
dummy.attrs.test(characteristics::DummyDataObject::Attr::Pointer) ||
dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedRank) ||
dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedShape)) {
// See 15.5.2.4 paragraph 4., 15.5.2.5.
messages.Say(
"Actual argument variable length '%jd' does not match the expected length '%jd'"_err_en_US,
*actualLength, *dummyLength);
} else if (*actualLength < *dummyLength) {
bool isVariable{evaluate::IsVariable(actual)};
if (context.ShouldWarn(common::UsageWarning::ShortCharacterActual)) {
if (isVariable) {
messages.Say(
"Actual argument variable length '%jd' is less than expected length '%jd'"_warn_en_US,
*actualLength, *dummyLength);
} else {
messages.Say(
"Actual argument expression length '%jd' is less than expected length '%jd'"_warn_en_US,
*actualLength, *dummyLength);
}
}
if (!isVariable) {
auto converted{ConvertToType(dummy.type.type(), std::move(actual))};
CHECK(converted);
actual = std::move(*converted);
actualType.set_LEN(SubscriptIntExpr{*dummyLength});
}
}
}
}
}
}
// Automatic conversion of different-kind INTEGER scalar actual
// argument expressions (not variables) to INTEGER scalar dummies.
// We return nonstandard INTEGER(8) results from intrinsic functions
// like SIZE() by default in order to facilitate the use of large
// arrays. Emit a warning when downconverting.
static void ConvertIntegerActual(evaluate::Expr<evaluate::SomeType> &actual,
const characteristics::TypeAndShape &dummyType,
characteristics::TypeAndShape &actualType,
parser::ContextualMessages &messages) {
if (dummyType.type().category() == TypeCategory::Integer &&
actualType.type().category() == TypeCategory::Integer &&
dummyType.type().kind() != actualType.type().kind() &&
GetRank(dummyType.shape()) == 0 && GetRank(actualType.shape()) == 0 &&
!evaluate::IsVariable(actual)) {
auto converted{
evaluate::ConvertToType(dummyType.type(), std::move(actual))};
CHECK(converted);
actual = std::move(*converted);
if (dummyType.type().kind() < actualType.type().kind()) {
messages.Say(
"Actual argument scalar expression of type INTEGER(%d) was converted to smaller dummy argument type INTEGER(%d)"_port_en_US,
actualType.type().kind(), dummyType.type().kind());
}
actualType = dummyType;
}
}
static bool DefersSameTypeParameters(
const DerivedTypeSpec &actual, const DerivedTypeSpec &dummy) {
for (const auto &pair : actual.parameters()) {
const ParamValue &actualValue{pair.second};
const ParamValue *dummyValue{dummy.FindParameter(pair.first)};
if (!dummyValue || (actualValue.isDeferred() != dummyValue->isDeferred())) {
return false;
}
}
return true;
}
static void CheckExplicitDataArg(const characteristics::DummyDataObject &dummy,
const std::string &dummyName, evaluate::Expr<evaluate::SomeType> &actual,
characteristics::TypeAndShape &actualType, bool isElemental,
SemanticsContext &context, evaluate::FoldingContext &foldingContext,
const Scope *scope, const evaluate::SpecificIntrinsic *intrinsic,
bool allowActualArgumentConversions,
const characteristics::Procedure &procedure) {
// Basic type & rank checking
parser::ContextualMessages &messages{foldingContext.messages()};
CheckCharacterActual(actual, dummy, actualType, context, messages);
bool dummyIsAllocatable{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Allocatable)};
bool dummyIsPointer{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Pointer)};
bool dummyIsAllocatableOrPointer{dummyIsAllocatable || dummyIsPointer};
allowActualArgumentConversions &= !dummyIsAllocatableOrPointer;
bool typesCompatibleWithIgnoreTKR{
(dummy.ignoreTKR.test(common::IgnoreTKR::Type) &&
(dummy.type.type().category() == TypeCategory::Derived ||
actualType.type().category() == TypeCategory::Derived ||
dummy.type.type().category() != actualType.type().category())) ||
(dummy.ignoreTKR.test(common::IgnoreTKR::Kind) &&
dummy.type.type().category() == actualType.type().category())};
allowActualArgumentConversions &= !typesCompatibleWithIgnoreTKR;
if (allowActualArgumentConversions) {
ConvertIntegerActual(actual, dummy.type, actualType, messages);
}
bool typesCompatible{typesCompatibleWithIgnoreTKR ||
dummy.type.type().IsTkCompatibleWith(actualType.type())};
if (!typesCompatible && dummy.type.Rank() == 0 &&
allowActualArgumentConversions) {
// Extension: pass Hollerith literal to scalar as if it had been BOZ
if (auto converted{evaluate::HollerithToBOZ(
foldingContext, actual, dummy.type.type())}) {
messages.Say(
"passing Hollerith or character literal as if it were BOZ"_port_en_US);
actual = *converted;
actualType.type() = dummy.type.type();
typesCompatible = true;
}
}
if (typesCompatible) {
if (isElemental) {
} else if (dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedRank)) {
} else if (dummy.ignoreTKR.test(common::IgnoreTKR::Rank)) {
} else if (dummy.type.Rank() > 0 && !dummyIsAllocatableOrPointer &&
!dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedShape) &&
!dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::DeferredShape) &&
(actualType.Rank() > 0 || IsArrayElement(actual))) {
// Sequence association (15.5.2.11) applies -- rank need not match
// if the actual argument is an array or array element designator,
// and the dummy is an array, but not assumed-shape or an INTENT(IN)
// pointer that's standing in for an assumed-shape dummy.
} else {
// Let CheckConformance accept actual scalars; storage association
// cases are checked here below.
CheckConformance(messages, dummy.type.shape(), actualType.shape(),
dummyIsAllocatableOrPointer
? evaluate::CheckConformanceFlags::None
: evaluate::CheckConformanceFlags::RightScalarExpandable,
"dummy argument", "actual argument");
}
} else {
const auto &len{actualType.LEN()};
messages.Say(
"Actual argument type '%s' is not compatible with dummy argument type '%s'"_err_en_US,
actualType.type().AsFortran(len ? len->AsFortran() : ""),
dummy.type.type().AsFortran());
}
bool actualIsPolymorphic{actualType.type().IsPolymorphic()};
bool dummyIsPolymorphic{dummy.type.type().IsPolymorphic()};
bool actualIsCoindexed{ExtractCoarrayRef(actual).has_value()};
bool actualIsAssumedSize{actualType.attrs().test(
characteristics::TypeAndShape::Attr::AssumedSize)};
bool dummyIsAssumedSize{dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedSize)};
bool dummyIsAsynchronous{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Asynchronous)};
bool dummyIsVolatile{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Volatile)};
bool dummyIsValue{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Value)};
if (actualIsPolymorphic && dummyIsPolymorphic &&
actualIsCoindexed) { // 15.5.2.4(2)
messages.Say(
"Coindexed polymorphic object may not be associated with a polymorphic %s"_err_en_US,
dummyName);
}
if (actualIsPolymorphic && !dummyIsPolymorphic &&
actualIsAssumedSize) { // 15.5.2.4(2)
messages.Say(
"Assumed-size polymorphic array may not be associated with a monomorphic %s"_err_en_US,
dummyName);
}
// Derived type actual argument checks
const Symbol *actualFirstSymbol{evaluate::GetFirstSymbol(actual)};
bool actualIsAsynchronous{
actualFirstSymbol && actualFirstSymbol->attrs().test(Attr::ASYNCHRONOUS)};
bool actualIsVolatile{
actualFirstSymbol && actualFirstSymbol->attrs().test(Attr::VOLATILE)};
if (const auto *derived{evaluate::GetDerivedTypeSpec(actualType.type())}) {
if (dummy.type.type().IsAssumedType()) {
if (!derived->parameters().empty()) { // 15.5.2.4(2)
messages.Say(
"Actual argument associated with TYPE(*) %s may not have a parameterized derived type"_err_en_US,
dummyName);
}
if (const Symbol *
tbp{FindImmediateComponent(*derived, [](const Symbol &symbol) {
return symbol.has<ProcBindingDetails>();
})}) { // 15.5.2.4(2)
evaluate::SayWithDeclaration(messages, *tbp,
"Actual argument associated with TYPE(*) %s may not have type-bound procedure '%s'"_err_en_US,
dummyName, tbp->name());
}
auto finals{FinalsForDerivedTypeInstantiation(*derived)};
if (!finals.empty()) { // 15.5.2.4(2)
SourceName name{finals.front()->name()};
if (auto *msg{messages.Say(
"Actual argument associated with TYPE(*) %s may not have derived type '%s' with FINAL subroutine '%s'"_err_en_US,
dummyName, derived->typeSymbol().name(), name)}) {
msg->Attach(name, "FINAL subroutine '%s' in derived type '%s'"_en_US,
name, derived->typeSymbol().name());
}
}
}
if (actualIsCoindexed) {
if (dummy.intent != common::Intent::In && !dummyIsValue) {
if (auto bad{
FindAllocatableUltimateComponent(*derived)}) { // 15.5.2.4(6)
evaluate::SayWithDeclaration(messages, *bad,
"Coindexed actual argument with ALLOCATABLE ultimate component '%s' must be associated with a %s with VALUE or INTENT(IN) attributes"_err_en_US,
bad.BuildResultDesignatorName(), dummyName);
}
}
if (auto coarrayRef{evaluate::ExtractCoarrayRef(actual)}) { // C1537
const Symbol &coarray{coarrayRef->GetLastSymbol()};
if (const DeclTypeSpec * type{coarray.GetType()}) {
if (const DerivedTypeSpec * derived{type->AsDerived()}) {
if (auto bad{semantics::FindPointerUltimateComponent(*derived)}) {
evaluate::SayWithDeclaration(messages, coarray,
"Coindexed object '%s' with POINTER ultimate component '%s' cannot be associated with %s"_err_en_US,
coarray.name(), bad.BuildResultDesignatorName(), dummyName);
}
}
}
}
}
if (actualIsVolatile != dummyIsVolatile) { // 15.5.2.4(22)
if (auto bad{semantics::FindCoarrayUltimateComponent(*derived)}) {
evaluate::SayWithDeclaration(messages, *bad,
"VOLATILE attribute must match for %s when actual argument has a coarray ultimate component '%s'"_err_en_US,
dummyName, bad.BuildResultDesignatorName());
}
}
}
// Rank and shape checks
const auto *actualLastSymbol{evaluate::GetLastSymbol(actual)};
if (actualLastSymbol) {
actualLastSymbol = &ResolveAssociations(*actualLastSymbol);
}
const ObjectEntityDetails *actualLastObject{actualLastSymbol
? actualLastSymbol->detailsIf<ObjectEntityDetails>()
: nullptr};
int actualRank{evaluate::GetRank(actualType.shape())};
bool actualIsPointer{evaluate::IsObjectPointer(actual, foldingContext)};
bool dummyIsAssumedRank{dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedRank)};
if (dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedShape)) {
// 15.5.2.4(16)
if (actualRank == 0) {
messages.Say(
"Scalar actual argument may not be associated with assumed-shape %s"_err_en_US,
dummyName);
}
if (actualIsAssumedSize && actualLastSymbol) {
evaluate::SayWithDeclaration(messages, *actualLastSymbol,
"Assumed-size array may not be associated with assumed-shape %s"_err_en_US,
dummyName);
}
} else if (actualRank == 0 && dummy.type.Rank() > 0 &&
!dummyIsAllocatableOrPointer) {
// Actual is scalar, dummy is an array. 15.5.2.4(14), 15.5.2.11
if (actualIsCoindexed) {
messages.Say(
"Coindexed scalar actual argument must be associated with a scalar %s"_err_en_US,
dummyName);
}
bool actualIsArrayElement{IsArrayElement(actual)};
bool actualIsCKindCharacter{
actualType.type().category() == TypeCategory::Character &&
actualType.type().kind() == 1};
if (!actualIsCKindCharacter) {
if (!actualIsArrayElement &&
!(dummy.type.type().IsAssumedType() && dummyIsAssumedSize) &&
!dummyIsAssumedRank &&
!dummy.ignoreTKR.test(common::IgnoreTKR::Rank)) {
messages.Say(
"Whole scalar actual argument may not be associated with a %s array"_err_en_US,
dummyName);
}
if (actualIsPolymorphic) {
messages.Say(
"Polymorphic scalar may not be associated with a %s array"_err_en_US,
dummyName);
}
if (actualIsArrayElement && actualLastSymbol &&
IsPointer(*actualLastSymbol)) {
messages.Say(
"Element of pointer array may not be associated with a %s array"_err_en_US,
dummyName);
}
if (actualLastSymbol && IsAssumedShape(*actualLastSymbol)) {
messages.Say(
"Element of assumed-shape array may not be associated with a %s array"_err_en_US,
dummyName);
}
}
}
if (actualLastObject && actualLastObject->IsCoarray() &&
IsAllocatable(*actualLastSymbol) && dummy.intent == common::Intent::Out &&
!(intrinsic &&
evaluate::AcceptsIntentOutAllocatableCoarray(
intrinsic->name))) { // C846
messages.Say(
"ALLOCATABLE coarray '%s' may not be associated with INTENT(OUT) %s"_err_en_US,
actualLastSymbol->name(), dummyName);
}
// Definability
const char *reason{nullptr};
if (dummy.intent == common::Intent::Out) {
reason = "INTENT(OUT)";
} else if (dummy.intent == common::Intent::InOut) {
reason = "INTENT(IN OUT)";
}
if (reason && scope) {
// Problems with polymorphism are caught in the callee's definition.
DefinabilityFlags flags{DefinabilityFlag::PolymorphicOkInPure};
if (isElemental || dummyIsValue) { // 15.5.2.4(21)
flags.set(DefinabilityFlag::VectorSubscriptIsOk);
}
if (actualIsPointer && dummyIsPointer) { // 19.6.8
flags.set(DefinabilityFlag::PointerDefinition);
}
if (auto whyNot{WhyNotDefinable(messages.at(), *scope, flags, actual)}) {
if (auto *msg{messages.Say(
"Actual argument associated with %s %s is not definable"_err_en_US,
reason, dummyName)}) {
msg->Attach(std::move(*whyNot));
}
}
}
// technically legal but worth emitting a warning
// llvm-project issue #58973: constant actual argument passed in where dummy
// argument is marked volatile
bool actualIsVariable{evaluate::IsVariable(actual)};
if (dummyIsVolatile && !actualIsVariable &&
context.ShouldWarn(common::UsageWarning::ExprPassedToVolatile)) {
messages.Say(
"actual argument associated with VOLATILE %s is not a variable"_warn_en_US,
dummyName);
}
// Cases when temporaries might be needed but must not be permitted.
bool actualIsContiguous{IsSimplyContiguous(actual, foldingContext)};
bool dummyIsAssumedShape{dummy.type.attrs().test(
characteristics::TypeAndShape::Attr::AssumedShape)};
bool dummyIsContiguous{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Contiguous)};
if ((actualIsAsynchronous || actualIsVolatile) &&
(dummyIsAsynchronous || dummyIsVolatile) && !dummyIsValue) {
if (actualIsCoindexed) { // C1538
messages.Say(
"Coindexed ASYNCHRONOUS or VOLATILE actual argument may not be associated with %s with ASYNCHRONOUS or VOLATILE attributes unless VALUE"_err_en_US,
dummyName);
}
if (actualRank > 0 && !actualIsContiguous) {
if (dummyIsContiguous ||
!(dummyIsAssumedShape || dummyIsAssumedRank ||
(actualIsPointer && dummyIsPointer))) { // C1539 & C1540
messages.Say(
"ASYNCHRONOUS or VOLATILE actual argument that is not simply contiguous may not be associated with a contiguous %s"_err_en_US,
dummyName);
}
}
}
// 15.5.2.6 -- dummy is ALLOCATABLE
bool actualIsAllocatable{evaluate::IsAllocatableDesignator(actual)};
if (dummyIsAllocatable) {
if (!actualIsAllocatable) {
messages.Say(
"ALLOCATABLE %s must be associated with an ALLOCATABLE actual argument"_err_en_US,
dummyName);
}
if (actualIsAllocatable && actualIsCoindexed &&
dummy.intent != common::Intent::In) {
messages.Say(
"ALLOCATABLE %s must have INTENT(IN) to be associated with a coindexed actual argument"_err_en_US,
dummyName);
}
if (!actualIsCoindexed && actualLastSymbol &&
actualLastSymbol->Corank() != dummy.type.corank()) {
messages.Say(
"ALLOCATABLE %s has corank %d but actual argument has corank %d"_err_en_US,
dummyName, dummy.type.corank(), actualLastSymbol->Corank());
}
}
// 15.5.2.7 -- dummy is POINTER
if (dummyIsPointer) {
if (actualIsPointer || dummy.intent == common::Intent::In) {
if (scope) {
semantics::CheckPointerAssignment(
context, messages.at(), dummyName, dummy, actual, *scope);
}
} else if (!actualIsPointer) {
messages.Say(
"Actual argument associated with POINTER %s must also be POINTER unless INTENT(IN)"_err_en_US,
dummyName);
}
}
// 15.5.2.5 -- actual & dummy are both POINTER or both ALLOCATABLE
if ((actualIsPointer && dummyIsPointer) ||
(actualIsAllocatable && dummyIsAllocatable)) {
bool actualIsUnlimited{actualType.type().IsUnlimitedPolymorphic()};
bool dummyIsUnlimited{dummy.type.type().IsUnlimitedPolymorphic()};
if (actualIsUnlimited != dummyIsUnlimited) {
if (typesCompatible) {
messages.Say(
"If a POINTER or ALLOCATABLE dummy or actual argument is unlimited polymorphic, both must be so"_err_en_US);
}
} else if (dummyIsPolymorphic != actualIsPolymorphic) {
if (dummy.intent == common::Intent::In && typesCompatible) {
// extension: allow with warning, rule is only relevant for definables
messages.Say(
"If a POINTER or ALLOCATABLE dummy or actual argument is polymorphic, both should be so"_port_en_US);
} else {
messages.Say(
"If a POINTER or ALLOCATABLE dummy or actual argument is polymorphic, both must be so"_err_en_US);
}
} else if (!actualIsUnlimited && typesCompatible) {
if (!actualType.type().IsTkCompatibleWith(dummy.type.type())) {
if (dummy.intent == common::Intent::In) {
// extension: allow with warning, rule is only relevant for definables
messages.Say(
"POINTER or ALLOCATABLE dummy and actual arguments should have the same declared type and kind"_port_en_US);
} else {
messages.Say(
"POINTER or ALLOCATABLE dummy and actual arguments must have the same declared type and kind"_err_en_US);
}
}
// 15.5.2.5(4)
const auto *derived{evaluate::GetDerivedTypeSpec(actualType.type())};
if ((derived &&
!DefersSameTypeParameters(*derived,
*evaluate::GetDerivedTypeSpec(dummy.type.type()))) ||
dummy.type.type().HasDeferredTypeParameter() !=
actualType.type().HasDeferredTypeParameter()) {
messages.Say(
"Dummy and actual arguments must defer the same type parameters when POINTER or ALLOCATABLE"_err_en_US);
}
}
}
// 15.5.2.8 -- coarray dummy arguments
if (dummy.type.corank() > 0) {
if (actualType.corank() == 0) {
messages.Say(
"Actual argument associated with coarray %s must be a coarray"_err_en_US,
dummyName);
}
if (dummyIsVolatile) {
if (!actualIsVolatile) {
messages.Say(
"non-VOLATILE coarray may not be associated with VOLATILE coarray %s"_err_en_US,
dummyName);
}
} else {
if (actualIsVolatile) {
messages.Say(
"VOLATILE coarray may not be associated with non-VOLATILE coarray %s"_err_en_US,
dummyName);
}
}
if (actualRank == dummy.type.Rank() && !actualIsContiguous) {
if (dummyIsContiguous) {
messages.Say(
"Actual argument associated with a CONTIGUOUS coarray %s must be simply contiguous"_err_en_US,
dummyName);
} else if (!dummyIsAssumedShape && !dummyIsAssumedRank) {
messages.Say(
"Actual argument associated with coarray %s (not assumed shape or rank) must be simply contiguous"_err_en_US,
dummyName);
}
}
}
// NULL(MOLD=) checking for non-intrinsic procedures
bool dummyIsOptional{
dummy.attrs.test(characteristics::DummyDataObject::Attr::Optional)};
bool actualIsNull{evaluate::IsNullPointer(actual)};
if (!intrinsic && !dummyIsPointer && !dummyIsOptional && actualIsNull) {
messages.Say(
"Actual argument associated with %s may not be null pointer %s"_err_en_US,
dummyName, actual.AsFortran());
}
// Warn about dubious actual argument association with a TARGET dummy argument
if (dummy.attrs.test(characteristics::DummyDataObject::Attr::Target) &&
context.ShouldWarn(common::UsageWarning::NonTargetPassedToTarget)) {
bool actualIsTemp{!actualIsVariable || HasVectorSubscript(actual) ||
evaluate::ExtractCoarrayRef(actual)};
if (actualIsTemp) {
messages.Say(
"Any pointer associated with TARGET %s during this call will not be associated with the value of '%s' afterwards"_warn_en_US,
dummyName, actual.AsFortran());
} else {
auto actualSymbolVector{GetSymbolVector(actual)};
if (!evaluate::GetLastTarget(actualSymbolVector)) {
messages.Say(
"Any pointer associated with TARGET %s during this call must not be used afterwards, as '%s' is not a target"_warn_en_US,
dummyName, actual.AsFortran());
}
}
}
// CUDA
if (!intrinsic &&
!dummy.attrs.test(characteristics::DummyDataObject::Attr::Value)) {
std::optional<common::CUDADataAttr> actualDataAttr, dummyDataAttr;
if (const auto *actualObject{actualLastSymbol
? actualLastSymbol->detailsIf<ObjectEntityDetails>()
: nullptr}) {
actualDataAttr = actualObject->cudaDataAttr();
}
dummyDataAttr = dummy.cudaDataAttr;
// Treat MANAGED like DEVICE for nonallocatable nonpointer arguments to
// device subprograms
if (procedure.cudaSubprogramAttrs.value_or(
common::CUDASubprogramAttrs::Host) !=
common::CUDASubprogramAttrs::Host &&
!dummy.attrs.test(
characteristics::DummyDataObject::Attr::Allocatable) &&
!dummy.attrs.test(characteristics::DummyDataObject::Attr::Pointer)) {
if (!dummyDataAttr || *dummyDataAttr == common::CUDADataAttr::Managed) {
dummyDataAttr = common::CUDADataAttr::Device;
}
if ((!actualDataAttr && FindCUDADeviceContext(scope)) ||
(actualDataAttr &&
*actualDataAttr == common::CUDADataAttr::Managed)) {
actualDataAttr = common::CUDADataAttr::Device;
}
}
if (!common::AreCompatibleCUDADataAttrs(
dummyDataAttr, actualDataAttr, dummy.ignoreTKR)) {
auto toStr{[](std::optional<common::CUDADataAttr> x) {
return x ? "ATTRIBUTES("s +
parser::ToUpperCaseLetters(common::EnumToString(*x)) + ")"s
: "no CUDA data attribute"s;
}};
messages.Say(
"%s has %s but its associated actual argument has %s"_err_en_US,
dummyName, toStr(dummyDataAttr), toStr(actualDataAttr));
}
}
}
static void CheckProcedureArg(evaluate::ActualArgument &arg,
const characteristics::Procedure &proc,
const characteristics::DummyProcedure &dummy, const std::string &dummyName,
SemanticsContext &context) {
evaluate::FoldingContext &foldingContext{context.foldingContext()};
parser::ContextualMessages &messages{foldingContext.messages()};
auto restorer{
messages.SetLocation(arg.sourceLocation().value_or(messages.at()))};
const characteristics::Procedure &interface { dummy.procedure.value() };
if (const auto *expr{arg.UnwrapExpr()}) {
bool dummyIsPointer{
dummy.attrs.test(characteristics::DummyProcedure::Attr::Pointer)};
const auto *argProcDesignator{
std::get_if<evaluate::ProcedureDesignator>(&expr->u)};
const auto *argProcSymbol{
argProcDesignator ? argProcDesignator->GetSymbol() : nullptr};
if (argProcSymbol) {
if (const auto *subp{
argProcSymbol->GetUltimate().detailsIf<SubprogramDetails>()}) {
if (subp->stmtFunction()) {
evaluate::SayWithDeclaration(messages, *argProcSymbol,
"Statement function '%s' may not be passed as an actual argument"_err_en_US,
argProcSymbol->name());
return;
}
} else if (argProcSymbol->has<ProcBindingDetails>()) {
evaluate::SayWithDeclaration(messages, *argProcSymbol,
"Procedure binding '%s' passed as an actual argument"_port_en_US,
argProcSymbol->name());
}
}
if (auto argChars{characteristics::DummyArgument::FromActual(
"actual argument", *expr, foldingContext)}) {
if (!argChars->IsTypelessIntrinsicDummy()) {
if (auto *argProc{
std::get_if<characteristics::DummyProcedure>(&argChars->u)}) {
characteristics::Procedure &argInterface{argProc->procedure.value()};
argInterface.attrs.reset(
characteristics::Procedure::Attr::NullPointer);
if (!argProcSymbol || argProcSymbol->attrs().test(Attr::INTRINSIC)) {
// It's ok to pass ELEMENTAL unrestricted intrinsic functions.
argInterface.attrs.reset(
characteristics::Procedure::Attr::Elemental);
} else if (argInterface.attrs.test(
characteristics::Procedure::Attr::Elemental)) {
if (argProcSymbol) { // C1533
evaluate::SayWithDeclaration(messages, *argProcSymbol,
"Non-intrinsic ELEMENTAL procedure '%s' may not be passed as an actual argument"_err_en_US,
argProcSymbol->name());
return; // avoid piling on with checks below
} else {
argInterface.attrs.reset(
characteristics::Procedure::Attr::NullPointer);
}
}
if (interface.HasExplicitInterface()) {
std::string whyNot;
if (!interface.IsCompatibleWith(argInterface, &whyNot)) {
// 15.5.2.9(1): Explicit interfaces must match
if (argInterface.HasExplicitInterface()) {
messages.Say(
"Actual procedure argument has interface incompatible with %s: %s"_err_en_US,
dummyName, whyNot);
return;
} else if (proc.IsPure()) {
messages.Say(
"Actual procedure argument for %s of a PURE procedure must have an explicit interface"_err_en_US,
dummyName);
} else if (context.ShouldWarn(
common::UsageWarning::ImplicitInterfaceActual)) {
messages.Say(
"Actual procedure argument has an implicit interface which is not known to be compatible with %s which has an explicit interface"_warn_en_US,
dummyName);
}
}
} else { // 15.5.2.9(2,3)
if (interface.IsSubroutine() && argInterface.IsFunction()) {
messages.Say(
"Actual argument associated with procedure %s is a function but must be a subroutine"_err_en_US,
dummyName);
} else if (interface.IsFunction()) {
if (argInterface.IsFunction()) {
std::string whyNot;
if (!interface.functionResult->IsCompatibleWith(
*argInterface.functionResult, &whyNot)) {
messages.Say(
"Actual argument function associated with procedure %s is not compatible: %s"_err_en_US,
dummyName, whyNot);
}
} else if (argInterface.IsSubroutine()) {
messages.Say(
"Actual argument associated with procedure %s is a subroutine but must be a function"_err_en_US,
dummyName);
}
}
}
} else {
messages.Say(
"Actual argument associated with procedure %s is not a procedure"_err_en_US,
dummyName);
}
} else if (IsNullPointer(*expr)) {
if (!dummyIsPointer &&
!dummy.attrs.test(
characteristics::DummyProcedure::Attr::Optional)) {
messages.Say(
"Actual argument associated with procedure %s is a null pointer"_err_en_US,
dummyName);
}
} else {
messages.Say(
"Actual argument associated with procedure %s is typeless"_err_en_US,
dummyName);
}
}
if (dummyIsPointer && dummy.intent != common::Intent::In) {
const Symbol *last{GetLastSymbol(*expr)};
if (last && IsProcedurePointer(*last)) {
if (dummy.intent != common::Intent::Default &&
IsIntentIn(last->GetUltimate())) { // 19.6.8
messages.Say(
"Actual argument associated with procedure pointer %s may not be INTENT(IN)"_err_en_US,
dummyName);
}
} else if (!(dummy.intent == common::Intent::Default &&
IsNullProcedurePointer(*expr))) {
// 15.5.2.9(5) -- dummy procedure POINTER
// Interface compatibility has already been checked above
messages.Say(
"Actual argument associated with procedure pointer %s must be a POINTER unless INTENT(IN)"_err_en_US,
dummyName);
}
}
} else {
messages.Say(
"Assumed-type argument may not be forwarded as procedure %s"_err_en_US,
dummyName);
}
}
// Allow BOZ literal actual arguments when they can be converted to a known
// dummy argument type
static void ConvertBOZLiteralArg(
evaluate::ActualArgument &arg, const evaluate::DynamicType &type) {
if (auto *expr{arg.UnwrapExpr()}) {
if (IsBOZLiteral(*expr)) {
if (auto converted{evaluate::ConvertToType(type, SomeExpr{*expr})}) {
arg = std::move(*converted);
}
}
}
}
static void CheckExplicitInterfaceArg(evaluate::ActualArgument &arg,
const characteristics::DummyArgument &dummy,
const characteristics::Procedure &proc, SemanticsContext &context,
const Scope *scope, const evaluate::SpecificIntrinsic *intrinsic,
bool allowActualArgumentConversions) {
evaluate::FoldingContext &foldingContext{context.foldingContext()};
auto &messages{foldingContext.messages()};
std::string dummyName{"dummy argument"};
if (!dummy.name.empty()) {
dummyName += " '"s + parser::ToLowerCaseLetters(dummy.name) + "='";
}
auto restorer{
messages.SetLocation(arg.sourceLocation().value_or(messages.at()))};
auto checkActualArgForLabel = [&](evaluate::ActualArgument &arg) {
if (arg.isAlternateReturn()) {
messages.Say(
"Alternate return label '%d' cannot be associated with %s"_err_en_US,
arg.GetLabel(), dummyName);
return true;
} else {
return false;
}
};
common::visit(
common::visitors{
[&](const characteristics::DummyDataObject &object) {
if (!checkActualArgForLabel(arg)) {
ConvertBOZLiteralArg(arg, object.type.type());
if (auto *expr{arg.UnwrapExpr()}) {
if (auto type{characteristics::TypeAndShape::Characterize(
*expr, foldingContext)}) {
arg.set_dummyIntent(object.intent);
bool isElemental{
object.type.Rank() == 0 && proc.IsElemental()};
CheckExplicitDataArg(object, dummyName, *expr, *type,
isElemental, context, foldingContext, scope, intrinsic,
allowActualArgumentConversions, proc);
} else if (object.type.type().IsTypelessIntrinsicArgument() &&
IsBOZLiteral(*expr)) {
// ok
} else if (object.type.type().IsTypelessIntrinsicArgument() &&
evaluate::IsNullObjectPointer(*expr)) {
// ok, ASSOCIATED(NULL())
} else if ((object.attrs.test(characteristics::DummyDataObject::
Attr::Pointer) ||
object.attrs.test(characteristics::
DummyDataObject::Attr::Optional)) &&
evaluate::IsNullObjectPointer(*expr)) {
// ok, FOO(NULL())
} else if (object.attrs.test(characteristics::DummyDataObject::
Attr::Allocatable) &&
evaluate::IsNullPointer(*expr)) {
// Unsupported extension that more or less naturally falls
// out of other Fortran implementations that pass separate
// base address and descriptor address physical arguments
messages.Say(
"Null actual argument '%s' may not be associated with allocatable %s"_err_en_US,
expr->AsFortran(), dummyName);
} else {
messages.Say(
"Actual argument '%s' associated with %s is not a variable or typed expression"_err_en_US,
expr->AsFortran(), dummyName);
}
} else {
const Symbol &assumed{DEREF(arg.GetAssumedTypeDummy())};
if (!object.type.type().IsAssumedType()) {
messages.Say(
"Assumed-type '%s' may be associated only with an assumed-type %s"_err_en_US,
assumed.name(), dummyName);
} else if (object.type.attrs().test(evaluate::characteristics::
TypeAndShape::Attr::AssumedRank) &&
!IsAssumedShape(assumed) &&
!evaluate::IsAssumedRank(assumed)) {
messages.Say( // C711
"Assumed-type '%s' must be either assumed shape or assumed rank to be associated with assumed rank %s"_err_en_US,
assumed.name(), dummyName);
}
}
}
},
[&](const characteristics::DummyProcedure &dummy) {
if (!checkActualArgForLabel(arg)) {
CheckProcedureArg(arg, proc, dummy, dummyName, context);
}
},
[&](const characteristics::AlternateReturn &) {
// All semantic checking is done elsewhere
},
},
dummy.u);
}
static void RearrangeArguments(const characteristics::Procedure &proc,
evaluate::ActualArguments &actuals, parser::ContextualMessages &messages) {
CHECK(proc.HasExplicitInterface());
if (actuals.size() < proc.dummyArguments.size()) {
actuals.resize(proc.dummyArguments.size());
} else if (actuals.size() > proc.dummyArguments.size()) {
messages.Say(
"Too many actual arguments (%zd) passed to procedure that expects only %zd"_err_en_US,
actuals.size(), proc.dummyArguments.size());
}
std::map<std::string, evaluate::ActualArgument> kwArgs;
bool anyKeyword{false};
int which{1};
for (auto &x : actuals) {
if (!x) {
} else if (x->keyword()) {
auto emplaced{
kwArgs.try_emplace(x->keyword()->ToString(), std::move(*x))};
if (!emplaced.second) {
messages.Say(*x->keyword(),
"Argument keyword '%s=' appears on more than one effective argument in this procedure reference"_err_en_US,
*x->keyword());
}
x.reset();
anyKeyword = true;
} else if (anyKeyword) {
messages.Say(x ? x->sourceLocation() : std::nullopt,
"Actual argument #%d without a keyword may not follow any actual argument with a keyword"_err_en_US,
which);
}
++which;
}
if (!kwArgs.empty()) {
int index{0};
for (const auto &dummy : proc.dummyArguments) {
if (!dummy.name.empty()) {
auto iter{kwArgs.find(dummy.name)};
if (iter != kwArgs.end()) {
evaluate::ActualArgument &x{iter->second};
if (actuals[index]) {
messages.Say(*x.keyword(),
"Keyword argument '%s=' has already been specified positionally (#%d) in this procedure reference"_err_en_US,
*x.keyword(), index + 1);
} else {
actuals[index] = std::move(x);
}
kwArgs.erase(iter);
}
}
++index;
}
for (auto &bad : kwArgs) {
evaluate::ActualArgument &x{bad.second};
messages.Say(*x.keyword(),
"Argument keyword '%s=' is not recognized for this procedure reference"_err_en_US,
*x.keyword());
}
}
}
// 15.8.1(3) -- In a reference to an elemental procedure, if any argument is an
// array, each actual argument that corresponds to an INTENT(OUT) or
// INTENT(INOUT) dummy argument shall be an array. The actual argument to an
// ELEMENTAL procedure must conform.
static bool CheckElementalConformance(parser::ContextualMessages &messages,
const characteristics::Procedure &proc, evaluate::ActualArguments &actuals,
evaluate::FoldingContext &context) {
std::optional<evaluate::Shape> shape;
std::string shapeName;
int index{0};
bool hasArrayArg{false};
for (const auto &arg : actuals) {
if (arg && !arg->isAlternateReturn() && arg->Rank() > 0) {
hasArrayArg = true;
break;
}
}
for (const auto &arg : actuals) {
const auto &dummy{proc.dummyArguments.at(index++)};
if (arg) {
if (const auto *expr{arg->UnwrapExpr()}) {
if (auto argShape{evaluate::GetShape(context, *expr)}) {