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//===-- lib/Semantics/check-deallocate.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-deallocate.h"
#include "check-allocate.h"
#include "definable.h"
#include "flang/Evaluate/type.h"
#include "flang/Parser/message.h"
#include "flang/Parser/parse-tree.h"
#include "flang/Semantics/expression.h"
#include "flang/Semantics/tools.h"
#include <optional>
namespace Fortran::semantics {
void DeallocateChecker::Leave(const parser::DeallocateStmt &deallocateStmt) {
bool gotStat{false}, gotMsg{false};
const SomeExpr *statVar{nullptr}, *msgVar{nullptr};
std::optional<parser::CharBlock> statSource;
std::optional<parser::CharBlock> msgSource;
for (const parser::StatOrErrmsg &deallocOpt :
std::get<std::list<parser::StatOrErrmsg>>(deallocateStmt.t)) {
common::visit(
common::visitors{
[&](const parser::StatVariable &var) {
if (gotStat) {
context_.Say(
"STAT may not be duplicated in a DEALLOCATE statement"_err_en_US);
}
gotStat = true;
statVar = GetExpr(context_, var);
statSource = parser::Unwrap<parser::Variable>(var)->GetSource();
},
[&](const parser::MsgVariable &var) {
WarnOnDeferredLengthCharacterScalar(context_,
GetExpr(context_, var),
parser::UnwrapRef<parser::Variable>(var).GetSource(),
"ERRMSG=");
if (gotMsg) {
context_.Say(
"ERRMSG may not be duplicated in a DEALLOCATE statement"_err_en_US);
}
gotMsg = true;
msgVar = GetExpr(context_, var);
msgSource = parser::Unwrap<parser::Variable>(var)->GetSource();
},
},
deallocOpt.u);
}
for (const parser::AllocateObject &allocateObject :
std::get<std::list<parser::AllocateObject>>(deallocateStmt.t)) {
parser::CharBlock source;
common::visit(
common::visitors{
[&](const parser::Name &name) {
const Symbol *symbol{
name.symbol ? &name.symbol->GetUltimate() : nullptr};
source = name.source;
if (context_.HasError(symbol)) {
// already reported an error
} else if (!IsVariableName(*symbol)) {
context_.Say(source,
"Name in DEALLOCATE statement must be a variable name"_err_en_US);
} else if (!IsAllocatableOrObjectPointer(symbol)) { // C936
context_.Say(source,
"Name in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);
} else if (auto whyNot{
WhyNotDefinable(source, context_.FindScope(source),
{DefinabilityFlag::PointerDefinition,
DefinabilityFlag::AcceptAllocatable,
DefinabilityFlag::PotentialDeallocation},
*symbol)}) {
// Catch problems with non-definability of the
// pointer/allocatable
context_
.Say(source,
"Name in DEALLOCATE statement is not definable"_err_en_US)
.Attach(std::move(
whyNot->set_severity(parser::Severity::Because)));
} else if (auto whyNot{
WhyNotDefinable(source, context_.FindScope(source),
DefinabilityFlags{}, *symbol)}) {
// Catch problems with non-definability of the dynamic object
context_
.Say(source,
"Object in DEALLOCATE statement is not deallocatable"_err_en_US)
.Attach(std::move(
whyNot->set_severity(parser::Severity::Because)));
} else {
context_.CheckIndexVarRedefine(name);
}
},
[&](const parser::StructureComponent &structureComponent) {
// Only perform structureComponent checks if it was successfully
// analyzed by expression analysis.
source = structureComponent.component.source;
if (const auto *expr{GetExpr(context_, allocateObject)}) {
if (const Symbol *symbol{structureComponent.component.symbol
? &structureComponent.component.symbol
->GetUltimate()
: nullptr};
!IsAllocatableOrObjectPointer(symbol)) { // F'2023 C936
context_.Say(source,
"Component in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);
} else if (auto whyNot{WhyNotDefinable(source,
context_.FindScope(source),
{DefinabilityFlag::PointerDefinition,
DefinabilityFlag::AcceptAllocatable,
DefinabilityFlag::PotentialDeallocation},
*expr)}) {
context_
.Say(source,
"Name in DEALLOCATE statement is not definable"_err_en_US)
.Attach(std::move(
whyNot->set_severity(parser::Severity::Because)));
} else if (auto whyNot{WhyNotDefinable(source,
context_.FindScope(source), DefinabilityFlags{},
*expr)}) {
context_
.Say(source,
"Object in DEALLOCATE statement is not deallocatable"_err_en_US)
.Attach(std::move(
whyNot->set_severity(parser::Severity::Because)));
} else if (evaluate::ExtractCoarrayRef(*expr)) { // F'2023 C955
context_.Say(source,
"Component in DEALLOCATE statement may not be coindexed"_err_en_US);
}
}
},
},
allocateObject.u);
if (const SomeExpr *allocObj{GetExpr(context_, allocateObject)}) {
if (AreSameAllocation(allocObj, statVar)) {
context_.Say(statSource.value_or(source),
"STAT variable in DEALLOCATE must not be the variable being deallocated"_err_en_US);
}
if (AreSameAllocation(allocObj, msgVar)) {
context_.Say(msgSource.value_or(source),
"ERRMSG variable in DEALLOCATE must not be the variable being deallocated"_err_en_US);
}
}
}
}
} // namespace Fortran::semantics
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