6acfa11fda
Original-commit: flang-compiler/f18@c9823da207 Reviewed-on: https://github.com/flang-compiler/f18/pull/311 Tree-same-pre-rewrite: false
74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
// Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FORTRAN_SEMANTICS_TOOLS_H_
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#define FORTRAN_SEMANTICS_TOOLS_H_
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// Simple predicates and look-up functions that are best defined
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// canonically for use in semantic checking.
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#include "scope.h"
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#include "symbol.h"
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#include "type.h"
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#include "../evaluate/variable.h"
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namespace Fortran::semantics {
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const Symbol *FindCommonBlockContaining(const Symbol &object);
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const Scope *FindProgramUnitContaining(const Scope &);
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const Scope *FindProgramUnitContaining(const Symbol &);
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const Scope *FindPureFunctionContaining(const Scope *);
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bool IsCommonBlockContaining(const Symbol &block, const Symbol &object);
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bool IsAncestor(const Scope *maybeAncestor, const Scope &maybeDescendent);
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bool IsUseAssociated(const Symbol *, const Scope &);
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bool IsHostAssociated(const Symbol &, const Scope &);
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bool IsDummy(const Symbol &);
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bool IsPointerDummy(const Symbol &);
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bool IsFunction(const Symbol &);
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bool IsPureFunction(const Symbol &);
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bool IsPureFunction(const Scope &);
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bool HasPointerComponent(const Scope &);
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bool HasPointerComponent(const DerivedTypeSpec &);
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bool HasPointerComponent(const DeclTypeSpec &);
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bool IsOrHasPointerComponent(const Symbol &);
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// Determines whether an object might be visible outside a
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// PURE function (C1594)
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bool IsExternallyVisibleObject(const Symbol &, const Scope &);
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template<typename A> bool IsExternallyVisibleObject(const A &, const Scope &) {
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return false; // default base case
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}
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template<typename T>
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bool IsExternallyVisibleObject(
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const evaluate::Designator<T> &designator, const Scope &scope) {
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if (const Symbol * symbol{designator.GetBaseObject().symbol()}) {
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return IsExternallyVisibleObject(*symbol, scope);
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} else {
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// Coindexed values are visible even if their image-local objects are not.
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return std::holds_alternative<evaluate::CoarrayRef>(designator.u);
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}
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}
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template<typename T>
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bool IsExternallyVisibleObject(
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const evaluate::Expr<T> &expr, const Scope &scope) {
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return std::visit(
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[&](const auto &x) { return IsExternallyVisibleObject(x, scope); },
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expr.u);
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}
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}
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#endif // FORTRAN_SEMANTICS_TOOLS_H_
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