clang-tools 10.0.0

ProTypeStaticCastDowncastCheck.cpp
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1 //===--- ProTypeStaticCastDowncastCheck.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 "ProTypeStaticCastDowncastCheck.h"
10 #include "clang/AST/ASTContext.h"
11 #include "clang/ASTMatchers/ASTMatchFinder.h"
12
13 using namespace clang::ast_matchers;
14
15 namespace clang {
16 namespace tidy {
17 namespace cppcoreguidelines {
18
19 void ProTypeStaticCastDowncastCheck::registerMatchers(MatchFinder *Finder) {
20 if (!getLangOpts().CPlusPlus)
21 return;
22
23 Finder->addMatcher(
24 cxxStaticCastExpr(unless(isInTemplateInstantiation())).bind("cast"),
25 this);
26 }
27
28 void ProTypeStaticCastDowncastCheck::check(
29 const MatchFinder::MatchResult &Result) {
30 const auto *MatchedCast = Result.Nodes.getNodeAs<CXXStaticCastExpr>("cast");
31 if (MatchedCast->getCastKind() != CK_BaseToDerived)
32 return;
33
34 QualType SourceType = MatchedCast->getSubExpr()->getType();
35 const auto *SourceDecl = SourceType->getPointeeCXXRecordDecl();
36 if (!SourceDecl) // The cast is from object to reference
37 SourceDecl = SourceType->getAsCXXRecordDecl();
38 if (!SourceDecl)
39 return;
40
41 if (SourceDecl->isPolymorphic())
42 diag(MatchedCast->getOperatorLoc(),
43 "do not use static_cast to downcast from a base to a derived class; "
44 "use dynamic_cast instead")
45 << FixItHint::CreateReplacement(MatchedCast->getOperatorLoc(),
46 "dynamic_cast");
47 else
48 diag(MatchedCast->getOperatorLoc(),
49 "do not use static_cast to downcast from a base to a derived class");
50 }
51
52 } // namespace cppcoreguidelines
53 } // namespace tidy
54 } // namespace clang
clang::ast_matchers
Definition: AbseilMatcher.h:14
ProTypeStaticCastDowncastCheck.h
clang
===– Representation.cpp - ClangDoc Representation --------—*- C++ -*-===//
Definition: ApplyReplacements.h:27