| 1 | //===--- AvoidConstOrRefDataMembersCheck.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 "AvoidConstOrRefDataMembersCheck.h" |
| 10 | #include "clang/AST/ASTContext.h" |
| 11 | #include "clang/ASTMatchers/ASTMatchFinder.h" |
| 12 | |
| 13 | using namespace clang::ast_matchers; |
| 14 | |
| 15 | namespace clang::tidy::cppcoreguidelines { |
| 16 | |
| 17 | static bool isCopyConstructible(CXXRecordDecl const &Node) { |
| 18 | if (Node.needsOverloadResolutionForCopyConstructor() && |
| 19 | Node.needsImplicitCopyConstructor()) { |
| 20 | // unresolved |
| 21 | for (CXXBaseSpecifier const &BS : Node.bases()) { |
| 22 | CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl(); |
| 23 | if (BRD != nullptr && !isCopyConstructible(Node: *BRD)) |
| 24 | return false; |
| 25 | } |
| 26 | } |
| 27 | if (Node.hasSimpleCopyConstructor()) |
| 28 | return true; |
| 29 | for (CXXConstructorDecl const *Ctor : Node.ctors()) |
| 30 | if (Ctor->isCopyConstructor()) |
| 31 | return !Ctor->isDeleted(); |
| 32 | return false; |
| 33 | } |
| 34 | |
| 35 | static bool isMoveConstructible(CXXRecordDecl const &Node) { |
| 36 | if (Node.needsOverloadResolutionForMoveConstructor() && |
| 37 | Node.needsImplicitMoveConstructor()) { |
| 38 | // unresolved |
| 39 | for (CXXBaseSpecifier const &BS : Node.bases()) { |
| 40 | CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl(); |
| 41 | if (BRD != nullptr && !isMoveConstructible(Node: *BRD)) |
| 42 | return false; |
| 43 | } |
| 44 | } |
| 45 | if (Node.hasSimpleMoveConstructor()) |
| 46 | return true; |
| 47 | for (CXXConstructorDecl const *Ctor : Node.ctors()) |
| 48 | if (Ctor->isMoveConstructor()) |
| 49 | return !Ctor->isDeleted(); |
| 50 | return false; |
| 51 | } |
| 52 | |
| 53 | static bool isCopyAssignable(CXXRecordDecl const &Node) { |
| 54 | if (Node.needsOverloadResolutionForCopyAssignment() && |
| 55 | Node.needsImplicitCopyAssignment()) { |
| 56 | // unresolved |
| 57 | for (CXXBaseSpecifier const &BS : Node.bases()) { |
| 58 | CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl(); |
| 59 | if (BRD != nullptr && !isCopyAssignable(Node: *BRD)) |
| 60 | return false; |
| 61 | } |
| 62 | } |
| 63 | if (Node.hasSimpleCopyAssignment()) |
| 64 | return true; |
| 65 | for (CXXMethodDecl const *Method : Node.methods()) |
| 66 | if (Method->isCopyAssignmentOperator()) |
| 67 | return !Method->isDeleted(); |
| 68 | return false; |
| 69 | } |
| 70 | |
| 71 | static bool isMoveAssignable(CXXRecordDecl const &Node) { |
| 72 | if (Node.needsOverloadResolutionForMoveAssignment() && |
| 73 | Node.needsImplicitMoveAssignment()) { |
| 74 | // unresolved |
| 75 | for (CXXBaseSpecifier const &BS : Node.bases()) { |
| 76 | CXXRecordDecl const *BRD = BS.getType()->getAsCXXRecordDecl(); |
| 77 | if (BRD != nullptr && !isMoveAssignable(Node: *BRD)) |
| 78 | return false; |
| 79 | } |
| 80 | } |
| 81 | if (Node.hasSimpleMoveAssignment()) |
| 82 | return true; |
| 83 | for (CXXMethodDecl const *Method : Node.methods()) |
| 84 | if (Method->isMoveAssignmentOperator()) |
| 85 | return !Method->isDeleted(); |
| 86 | return false; |
| 87 | } |
| 88 | |
| 89 | namespace { |
| 90 | |
| 91 | AST_MATCHER(FieldDecl, isMemberOfLambda) { |
| 92 | return Node.getParent()->isLambda(); |
| 93 | } |
| 94 | |
| 95 | AST_MATCHER(CXXRecordDecl, isCopyableOrMovable) { |
| 96 | return isCopyConstructible(Node) || isMoveConstructible(Node) || |
| 97 | isCopyAssignable(Node) || isMoveAssignable(Node); |
| 98 | } |
| 99 | |
| 100 | } // namespace |
| 101 | |
| 102 | void AvoidConstOrRefDataMembersCheck::registerMatchers(MatchFinder *Finder) { |
| 103 | Finder->addMatcher( |
| 104 | NodeMatch: fieldDecl( |
| 105 | unless(isMemberOfLambda()), |
| 106 | anyOf( |
| 107 | fieldDecl(hasType(InnerMatcher: hasCanonicalType(InnerMatcher: referenceType()))).bind(ID: "ref"), |
| 108 | fieldDecl(hasType(InnerMatcher: qualType(isConstQualified()))).bind(ID: "const")), |
| 109 | hasDeclContext(InnerMatcher: cxxRecordDecl(isCopyableOrMovable()))), |
| 110 | Action: this); |
| 111 | } |
| 112 | |
| 113 | void AvoidConstOrRefDataMembersCheck::check( |
| 114 | const MatchFinder::MatchResult &Result) { |
| 115 | if (const auto *MatchedDecl = Result.Nodes.getNodeAs<FieldDecl>(ID: "ref")) |
| 116 | diag(MatchedDecl->getLocation(), "member %0 of type %1 is a reference") |
| 117 | << MatchedDecl << MatchedDecl->getType(); |
| 118 | if (const auto *MatchedDecl = Result.Nodes.getNodeAs<FieldDecl>(ID: "const")) |
| 119 | diag(MatchedDecl->getLocation(), "member %0 of type %1 is const qualified") |
| 120 | << MatchedDecl << MatchedDecl->getType(); |
| 121 | } |
| 122 | |
| 123 | } // namespace clang::tidy::cppcoreguidelines |
| 124 |