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//===--- ProTypeStaticCastDowncastCheck.cpp - clang-tidy-------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ProTypeStaticCastDowncastCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace cppcoreguidelines {
void ProTypeStaticCastDowncastCheck::registerMatchers(MatchFinder *Finder) {
if (!getLangOpts().CPlusPlus)
return;
Finder->addMatcher(
cxxStaticCastExpr(unless(isInTemplateInstantiation())).bind("cast"),
this);
}
void ProTypeStaticCastDowncastCheck::check(
const MatchFinder::MatchResult &Result) {
const auto *MatchedCast = Result.Nodes.getNodeAs<CXXStaticCastExpr>("cast");
if (MatchedCast->getCastKind() != CK_BaseToDerived)
return;
QualType SourceType = MatchedCast->getSubExpr()->getType();
const auto *SourceDecl = SourceType->getPointeeCXXRecordDecl();
if (!SourceDecl) // The cast is from object to reference
SourceDecl = SourceType->getAsCXXRecordDecl();
if (!SourceDecl)
return;
if (SourceDecl->isPolymorphic())
diag(MatchedCast->getOperatorLoc(),
"do not use static_cast to downcast from a base to a derived class; "
"use dynamic_cast instead")
<< FixItHint::CreateReplacement(MatchedCast->getOperatorLoc(),
"dynamic_cast");
else
diag(MatchedCast->getOperatorLoc(),
"do not use static_cast to downcast from a base to a derived class");
}
} // namespace cppcoreguidelines
} // namespace tidy
} // namespace clang
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