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//===--- AvoidConstOrRefDataMembersCheck.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 "AvoidConstOrRefDataMembersCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::cppcoreguidelines {
static bool isCopyConstructible(CXXRecordDecl const &Node) {
if (Node.needsOverloadResolutionForCopyConstructor() &&
Node.needsImplicitCopyConstructor()) {
// unresolved
for (CXXBaseSpecifier const &BS : Node.bases()) {
CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl();
if (BRD != nullptr && !isCopyConstructible(*BRD))
return false;
}
}
if (Node.hasSimpleCopyConstructor())
return true;
for (CXXConstructorDecl const *Ctor : Node.ctors())
if (Ctor->isCopyConstructor())
return !Ctor->isDeleted();
return false;
}
static bool isMoveConstructible(CXXRecordDecl const &Node) {
if (Node.needsOverloadResolutionForMoveConstructor() &&
Node.needsImplicitMoveConstructor()) {
// unresolved
for (CXXBaseSpecifier const &BS : Node.bases()) {
CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl();
if (BRD != nullptr && !isMoveConstructible(*BRD))
return false;
}
}
if (Node.hasSimpleMoveConstructor())
return true;
for (CXXConstructorDecl const *Ctor : Node.ctors())
if (Ctor->isMoveConstructor())
return !Ctor->isDeleted();
return false;
}
static bool isCopyAssignable(CXXRecordDecl const &Node) {
if (Node.needsOverloadResolutionForCopyAssignment() &&
Node.needsImplicitCopyAssignment()) {
// unresolved
for (CXXBaseSpecifier const &BS : Node.bases()) {
CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl();
if (BRD != nullptr && !isCopyAssignable(*BRD))
return false;
}
}
if (Node.hasSimpleCopyAssignment())
return true;
for (CXXMethodDecl const *Method : Node.methods())
if (Method->isCopyAssignmentOperator())
return !Method->isDeleted();
return false;
}
static bool isMoveAssignable(CXXRecordDecl const &Node) {
if (Node.needsOverloadResolutionForMoveAssignment() &&
Node.needsImplicitMoveAssignment()) {
// unresolved
for (CXXBaseSpecifier const &BS : Node.bases()) {
CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl();
if (BRD != nullptr && !isMoveAssignable(*BRD))
return false;
}
}
if (Node.hasSimpleMoveAssignment())
return true;
for (CXXMethodDecl const *Method : Node.methods())
if (Method->isMoveAssignmentOperator())
return !Method->isDeleted();
return false;
}
namespace {
AST_MATCHER(FieldDecl, isMemberOfLambda) {
return Node.getParent()->isLambda();
}
AST_MATCHER(CXXRecordDecl, isCopyableOrMovable) {
return isCopyConstructible(Node) || isMoveConstructible(Node) ||
isCopyAssignable(Node) || isMoveAssignable(Node);
}
} // namespace
void AvoidConstOrRefDataMembersCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
fieldDecl(
unless(isMemberOfLambda()),
anyOf(
fieldDecl(hasType(hasCanonicalType(referenceType()))).bind("ref"),
fieldDecl(hasType(qualType(isConstQualified()))).bind("const")),
hasDeclContext(cxxRecordDecl(isCopyableOrMovable()))),
this);
}
void AvoidConstOrRefDataMembersCheck::check(
const MatchFinder::MatchResult &Result) {
if (const auto *MatchedDecl = Result.Nodes.getNodeAs<FieldDecl>("ref"))
diag(MatchedDecl->getLocation(), "member %0 of type %1 is a reference")
<< MatchedDecl << MatchedDecl->getType();
if (const auto *MatchedDecl = Result.Nodes.getNodeAs<FieldDecl>("const"))
diag(MatchedDecl->getLocation(), "member %0 of type %1 is const qualified")
<< MatchedDecl << MatchedDecl->getType();
}
} // namespace clang::tidy::cppcoreguidelines
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