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The infrastructure in semantics that is used to check that the left-hand sides of normal assignment statements are really definable variables was not being used to check whether the LHSs of pointer assignments are modifiable, and so most cases of unmodifiable pointers are left undiagnosed. Rework the semantics checking for pointer assignments, NULLIFY statements, pointer dummy arguments, &c. so that cases of unmodifiable pointers are properly caught. This has been done by extracting all the various definability checking code that has been implemented for different contexts in Fortran into one new facility. The new consolidated definability checking code returns messages meant to be attached as "because: " explanations to context-dependent errors like "left-hand side of assignment is not definable". These new error message texts and their attached explanations affect many existing tests, which have been updated. The testing infrastructure was extended by another patch to properly compare warnings and explanatory messages, which had been ignored until recently. Differential Revision: https://reviews.llvm.org/D136979
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
//===-- lib/Semantics/assignment.h ------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef FORTRAN_SEMANTICS_ASSIGNMENT_H_
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#define FORTRAN_SEMANTICS_ASSIGNMENT_H_
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#include "flang/Common/indirection.h"
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#include "flang/Evaluate/expression.h"
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#include "flang/Semantics/semantics.h"
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namespace Fortran::parser {
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class ContextualMessages;
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struct AssignmentStmt;
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struct EndWhereStmt;
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struct MaskedElsewhereStmt;
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struct PointerAssignmentStmt;
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struct WhereConstructStmt;
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struct WhereStmt;
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} // namespace Fortran::parser
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namespace Fortran::semantics {
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class AssignmentContext;
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class Scope;
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class Symbol;
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// Applies checks from C1594(5-6) on copying pointers in pure subprograms
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bool CheckCopyabilityInPureScope(parser::ContextualMessages &,
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const evaluate::Expr<evaluate::SomeType> &, const Scope &);
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class AssignmentChecker : public virtual BaseChecker {
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public:
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explicit AssignmentChecker(SemanticsContext &);
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~AssignmentChecker();
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void Enter(const parser::AssignmentStmt &);
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void Enter(const parser::PointerAssignmentStmt &);
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void Enter(const parser::WhereStmt &);
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void Leave(const parser::WhereStmt &);
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void Enter(const parser::WhereConstructStmt &);
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void Leave(const parser::EndWhereStmt &);
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void Enter(const parser::MaskedElsewhereStmt &);
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void Leave(const parser::MaskedElsewhereStmt &);
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private:
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common::Indirection<AssignmentContext> context_;
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};
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} // namespace Fortran::semantics
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extern template class Fortran::common::Indirection<
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Fortran::semantics::AssignmentContext>;
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#endif // FORTRAN_SEMANTICS_ASSIGNMENT_H_
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