1 //===--- CastingThroughVoidCheck.cpp - clang-tidy -------------------------===// 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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "CastingThroughVoidCheck.h" 10 #include "clang/AST/Expr.h" 11 #include "clang/AST/Type.h" 12 #include "clang/ASTMatchers/ASTMatchFinder.h" 13 #include "clang/ASTMatchers/ASTMatchers.h" 14 15 using namespace clang::ast_matchers; 16 17 namespace clang::tidy::bugprone { 18 19 void CastingThroughVoidCheck::registerMatchers(MatchFinder *Finder) { 20 Finder->addMatcher( 21 explicitCastExpr( 22 hasDestinationType( 23 qualType(unless(hasCanonicalType(pointsTo(voidType())))) 24 .bind("target_type")), 25 hasSourceExpression( 26 explicitCastExpr( 27 hasSourceExpression( 28 expr(hasType(qualType(unless(pointsTo(voidType()))) 29 .bind("source_type")))), 30 hasDestinationType( 31 qualType(pointsTo(voidType())).bind("void_type"))) 32 .bind("cast"))), 33 this); 34 } 35 36 void CastingThroughVoidCheck::check(const MatchFinder::MatchResult &Result) { 37 const auto TT = *Result.Nodes.getNodeAs<QualType>("target_type"); 38 const auto ST = *Result.Nodes.getNodeAs<QualType>("source_type"); 39 const auto VT = *Result.Nodes.getNodeAs<QualType>("void_type"); 40 const auto *CE = Result.Nodes.getNodeAs<ExplicitCastExpr>("cast"); 41 diag(CE->getExprLoc(), 42 "do not cast %0 to %1 through %2; use reinterpret_cast instead") 43 << ST << TT << VT; 44 } 45 46 } // namespace clang::tidy::bugprone 47