| 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 | NodeMatch: explicitCastExpr( |
| 22 | hasDestinationType( |
| 23 | InnerMatcher: qualType(unless(hasCanonicalType(InnerMatcher: pointsTo(InnerMatcher: voidType())))) |
| 24 | .bind(ID: "target_type")), |
| 25 | hasSourceExpression( |
| 26 | InnerMatcher: explicitCastExpr( |
| 27 | hasSourceExpression( |
| 28 | InnerMatcher: expr(hasType(InnerMatcher: qualType(unless(pointsTo(InnerMatcher: voidType()))) |
| 29 | .bind(ID: "source_type")))), |
| 30 | hasDestinationType( |
| 31 | InnerMatcher: qualType(pointsTo(InnerMatcher: voidType())).bind(ID: "void_type"))) |
| 32 | .bind(ID: "cast"))), |
| 33 | Action: this); |
| 34 | } |
| 35 | |
| 36 | void CastingThroughVoidCheck::check(const MatchFinder::MatchResult &Result) { |
| 37 | const auto TT = *Result.Nodes.getNodeAs<QualType>(ID: "target_type"); |
| 38 | const auto ST = *Result.Nodes.getNodeAs<QualType>(ID: "source_type"); |
| 39 | const auto VT = *Result.Nodes.getNodeAs<QualType>(ID: "void_type"); |
| 40 | const auto *CE = Result.Nodes.getNodeAs<ExplicitCastExpr>(ID: "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 |