================ @@ -0,0 +1,49 @@ +//===--- VirtualArithmeticCheck.cpp - clang-tidy---------------------------===// +// +// 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 "VirtualArithmeticCheck.h" +#include "clang/AST/ASTContext.h" +#include "clang/ASTMatchers/ASTMatchFinder.h" + +using namespace clang::ast_matchers; + +namespace clang::tidy::bugprone { + +void VirtualArithmeticCheck::registerMatchers(MatchFinder *Finder) { + const auto PointerExprWithVirtualMethod = + expr(hasType(pointerType(pointee(hasDeclaration( + cxxRecordDecl(hasMethod(isVirtualAsWritten()))))))) + .bind("pointer"); + + const auto ArraySubscript = + arraySubscriptExpr(hasBase(PointerExprWithVirtualMethod)); + + const auto BinaryOperators = + binaryOperator(hasAnyOperatorName("+", "-", "+=", "-="), + hasEitherOperand(PointerExprWithVirtualMethod)); + + const auto UnaryOperators = + unaryOperator(hasAnyOperatorName("++", "--"), + hasUnaryOperand(PointerExprWithVirtualMethod)); + + Finder->addMatcher( + expr(anyOf(ArraySubscript, BinaryOperators, UnaryOperators)), this); +} + +void VirtualArithmeticCheck::check(const MatchFinder::MatchResult &Result) { + const auto *PointerExpr = Result.Nodes.getNodeAs<Expr>("pointer"); + const CXXRecordDecl *PointeeType = + PointerExpr->getType()->getPointeeType()->getAsCXXRecordDecl(); + + diag(PointerExpr->getBeginLoc(), + "pointer arithmetic on class '%0' that declares a virtual function, " + "undefined behavior if the pointee is a different class") + << PointeeType->getName(); ---------------- 5chmidti wrote:
- Please stream the `SourceRange` of `PointerExpr` into the diagnostic, so that it is fully underlined in the diagnostic/editor - I think the comma should be replaced with `(can) result in`, wdyt? - You don't have to escape the `%0` with `'` when you pass `PointeeType` without the `getName` instead. https://github.com/llvm/llvm-project/pull/91951 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
