3568e45856
Original-commit: flang-compiler/f18@7d221b09bd
57 lines
2 KiB
C++
57 lines
2 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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#include "check-return.h"
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#include "semantics.h"
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#include "tools.h"
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#include "../parser/message.h"
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#include "../parser/parse-tree.h"
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namespace Fortran::semantics {
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const Scope *FindContainingSubprogram(const Scope &start) {
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const Scope *scope{&start};
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while (scope->kind() != Scope::Kind::Global) {
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switch (scope->kind()) {
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case Scope::Kind::MainProgram:
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case Scope::Kind::Subprogram: return scope;
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default: scope = &scope->parent(); break;
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}
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}
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return nullptr;
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}
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void ReturnStmtChecker::Leave(const parser::ReturnStmt &returnStmt) {
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// R1542 Expression analysis validates the scalar-int-expr
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// C1574 The return-stmt shall be in the inclusive scope of a function or
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// subroutine subprogram.
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// C1575 The scalar-int-expr is allowed only in the inclusive scope of a
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// subroutine subprogram.
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const auto &scope{context_.FindScope(*context_.location())};
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const auto *subprogramScope{FindContainingSubprogram(scope)};
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if (subprogramScope == nullptr) {
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context_.Say(
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"RETURN must in the inclusive scope of a SUBPROGRAM"_err_en_US);
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return;
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}
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if (returnStmt.v.has_value() &&
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subprogramScope->kind() == Scope::Kind::Subprogram) {
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if (IsFunction(*subprogramScope->GetSymbol())) {
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context_.Say(
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"RETURN with expression is only allowed in SUBROUTINE subprogram"_err_en_US);
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}
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}
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}
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} // namespace Fortran::semantics
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