151 lines · cpp
1//===-- lib/Semantics/check-deallocate.cpp --------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "check-deallocate.h"10#include "check-allocate.h"11#include "definable.h"12#include "flang/Evaluate/type.h"13#include "flang/Parser/message.h"14#include "flang/Parser/parse-tree.h"15#include "flang/Semantics/expression.h"16#include "flang/Semantics/tools.h"17#include <optional>18 19namespace Fortran::semantics {20 21void DeallocateChecker::Leave(const parser::DeallocateStmt &deallocateStmt) {22 bool gotStat{false}, gotMsg{false};23 const SomeExpr *statVar{nullptr}, *msgVar{nullptr};24 std::optional<parser::CharBlock> statSource;25 std::optional<parser::CharBlock> msgSource;26 for (const parser::StatOrErrmsg &deallocOpt :27 std::get<std::list<parser::StatOrErrmsg>>(deallocateStmt.t)) {28 common::visit(29 common::visitors{30 [&](const parser::StatVariable &var) {31 if (gotStat) {32 context_.Say(33 "STAT may not be duplicated in a DEALLOCATE statement"_err_en_US);34 }35 gotStat = true;36 statVar = GetExpr(context_, var);37 statSource = parser::Unwrap<parser::Variable>(var)->GetSource();38 },39 [&](const parser::MsgVariable &var) {40 WarnOnDeferredLengthCharacterScalar(context_,41 GetExpr(context_, var),42 parser::UnwrapRef<parser::Variable>(var).GetSource(),43 "ERRMSG=");44 if (gotMsg) {45 context_.Say(46 "ERRMSG may not be duplicated in a DEALLOCATE statement"_err_en_US);47 }48 gotMsg = true;49 msgVar = GetExpr(context_, var);50 msgSource = parser::Unwrap<parser::Variable>(var)->GetSource();51 },52 },53 deallocOpt.u);54 }55 for (const parser::AllocateObject &allocateObject :56 std::get<std::list<parser::AllocateObject>>(deallocateStmt.t)) {57 parser::CharBlock source;58 common::visit(59 common::visitors{60 [&](const parser::Name &name) {61 const Symbol *symbol{62 name.symbol ? &name.symbol->GetUltimate() : nullptr};63 source = name.source;64 if (context_.HasError(symbol)) {65 // already reported an error66 } else if (!IsVariableName(*symbol)) {67 context_.Say(source,68 "Name in DEALLOCATE statement must be a variable name"_err_en_US);69 } else if (!IsAllocatableOrObjectPointer(symbol)) { // C93670 context_.Say(source,71 "Name in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);72 } else if (auto whyNot{73 WhyNotDefinable(source, context_.FindScope(source),74 {DefinabilityFlag::PointerDefinition,75 DefinabilityFlag::AcceptAllocatable,76 DefinabilityFlag::PotentialDeallocation},77 *symbol)}) {78 // Catch problems with non-definability of the79 // pointer/allocatable80 context_81 .Say(source,82 "Name in DEALLOCATE statement is not definable"_err_en_US)83 .Attach(std::move(84 whyNot->set_severity(parser::Severity::Because)));85 } else if (auto whyNot{86 WhyNotDefinable(source, context_.FindScope(source),87 DefinabilityFlags{}, *symbol)}) {88 // Catch problems with non-definability of the dynamic object89 context_90 .Say(source,91 "Object in DEALLOCATE statement is not deallocatable"_err_en_US)92 .Attach(std::move(93 whyNot->set_severity(parser::Severity::Because)));94 } else {95 context_.CheckIndexVarRedefine(name);96 }97 },98 [&](const parser::StructureComponent &structureComponent) {99 // Only perform structureComponent checks if it was successfully100 // analyzed by expression analysis.101 source = structureComponent.component.source;102 if (const auto *expr{GetExpr(context_, allocateObject)}) {103 if (const Symbol *symbol{structureComponent.component.symbol104 ? &structureComponent.component.symbol105 ->GetUltimate()106 : nullptr};107 !IsAllocatableOrObjectPointer(symbol)) { // F'2023 C936108 context_.Say(source,109 "Component in DEALLOCATE statement must have the ALLOCATABLE or POINTER attribute"_err_en_US);110 } else if (auto whyNot{WhyNotDefinable(source,111 context_.FindScope(source),112 {DefinabilityFlag::PointerDefinition,113 DefinabilityFlag::AcceptAllocatable,114 DefinabilityFlag::PotentialDeallocation},115 *expr)}) {116 context_117 .Say(source,118 "Name in DEALLOCATE statement is not definable"_err_en_US)119 .Attach(std::move(120 whyNot->set_severity(parser::Severity::Because)));121 } else if (auto whyNot{WhyNotDefinable(source,122 context_.FindScope(source), DefinabilityFlags{},123 *expr)}) {124 context_125 .Say(source,126 "Object in DEALLOCATE statement is not deallocatable"_err_en_US)127 .Attach(std::move(128 whyNot->set_severity(parser::Severity::Because)));129 } else if (evaluate::ExtractCoarrayRef(*expr)) { // F'2023 C955130 context_.Say(source,131 "Component in DEALLOCATE statement may not be coindexed"_err_en_US);132 }133 }134 },135 },136 allocateObject.u);137 if (const SomeExpr *allocObj{GetExpr(context_, allocateObject)}) {138 if (AreSameAllocation(allocObj, statVar)) {139 context_.Say(statSource.value_or(source),140 "STAT variable in DEALLOCATE must not be the variable being deallocated"_err_en_US);141 }142 if (AreSameAllocation(allocObj, msgVar)) {143 context_.Say(msgSource.value_or(source),144 "ERRMSG variable in DEALLOCATE must not be the variable being deallocated"_err_en_US);145 }146 }147 }148}149 150} // namespace Fortran::semantics151