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//===--- CastingThroughVoidCheck.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 "CastingThroughVoidCheck.h"
#include "clang/AST/Expr.h"
#include "clang/AST/Type.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchers.h"
using namespace clang::ast_matchers;
namespace clang::tidy::bugprone {
void CastingThroughVoidCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
explicitCastExpr(
hasDestinationType(
qualType(unless(hasCanonicalType(pointsTo(voidType()))))
.bind("target_type")),
hasSourceExpression(
explicitCastExpr(
hasSourceExpression(
expr(hasType(qualType(unless(pointsTo(voidType())))
.bind("source_type")))),
hasDestinationType(
qualType(pointsTo(voidType())).bind("void_type")))
.bind("cast"))),
this);
}
void CastingThroughVoidCheck::check(const MatchFinder::MatchResult &Result) {
const auto TT = *Result.Nodes.getNodeAs<QualType>("target_type");
const auto ST = *Result.Nodes.getNodeAs<QualType>("source_type");
const auto VT = *Result.Nodes.getNodeAs<QualType>("void_type");
const auto *CE = Result.Nodes.getNodeAs<ExplicitCastExpr>("cast");
diag(CE->getExprLoc(),
"do not cast %0 to %1 through %2; use reinterpret_cast instead")
<< ST << TT << VT;
}
} // namespace clang::tidy::bugprone
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