RedundantMemberInitCheck.cpp
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//===--- RedundantMemberInitCheck.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 "RedundantMemberInitCheck.h"
#include "../utils/Matchers.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
#include <algorithm>
using namespace clang::ast_matchers;
using namespace clang::tidy::matchers;
namespace clang {
namespace tidy {
namespace readability {
void RedundantMemberInitCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "IgnoreBaseInCopyConstructors",
IgnoreBaseInCopyConstructors);
}
void RedundantMemberInitCheck::registerMatchers(MatchFinder *Finder) {
auto Construct =
cxxConstructExpr(
hasDeclaration(cxxConstructorDecl(hasParent(
cxxRecordDecl(unless(isTriviallyDefaultConstructible()))))))
.bind("construct");
Finder->addMatcher(
traverse(
ast_type_traits::TK_AsIs,
cxxConstructorDecl(
unless(isDelegatingConstructor()),
ofClass(unless(
anyOf(isUnion(), ast_matchers::isTemplateInstantiation()))),
forEachConstructorInitializer(
cxxCtorInitializer(
isWritten(), withInitializer(ignoringImplicit(Construct)),
unless(forField(hasType(isConstQualified()))),
unless(forField(hasParent(recordDecl(isUnion())))))
.bind("init")))
.bind("constructor")),
this);
}
void RedundantMemberInitCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Init = Result.Nodes.getNodeAs<CXXCtorInitializer>("init");
const auto *Construct = Result.Nodes.getNodeAs<CXXConstructExpr>("construct");
const auto *ConstructorDecl =
Result.Nodes.getNodeAs<CXXConstructorDecl>("constructor");
if (IgnoreBaseInCopyConstructors && ConstructorDecl->isCopyConstructor() &&
Init->isBaseInitializer())
return;
if (Construct->getNumArgs() == 0 ||
Construct->getArg(0)->isDefaultArgument()) {
if (Init->isAnyMemberInitializer()) {
diag(Init->getSourceLocation(), "initializer for member %0 is redundant")
<< Init->getAnyMember()
<< FixItHint::CreateRemoval(Init->getSourceRange());
} else {
diag(Init->getSourceLocation(),
"initializer for base class %0 is redundant")
<< Construct->getType()
<< FixItHint::CreateRemoval(Init->getSourceRange());
}
}
}
} // namespace readability
} // namespace tidy
} // namespace clang