clang-tools 20.0.0git
CastingThroughVoidCheck.cpp
Go to the documentation of this file.
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
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
15using namespace clang::ast_matchers;
16
17namespace clang::tidy::bugprone {
18
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
36void 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(), "do not cast %0 to %1 through %2") << ST << TT << VT;
42}
43
44} // namespace clang::tidy::bugprone
CaptureExpr CE
DiagnosticBuilder diag(SourceLocation Loc, StringRef Description, DiagnosticIDs::Level Level=DiagnosticIDs::Warning)
Add a diagnostic with the check's name.
void check(const ast_matchers::MatchFinder::MatchResult &Result) override
ClangTidyChecks that register ASTMatchers should do the actual work in here.
void registerMatchers(ast_matchers::MatchFinder *Finder) override
Override this to register AST matchers with Finder.