1 //===--- TemplateVirtualMemberFunctionCheck.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 "TemplateVirtualMemberFunctionCheck.h"
10 #include "clang/ASTMatchers/ASTMatchFinder.h"
11 
12 using namespace clang::ast_matchers;
13 
14 namespace clang::tidy::portability {
15 namespace {
16 AST_MATCHER(CXXMethodDecl, isUsed) { return Node.isUsed(); }
17 } // namespace
18 
19 void TemplateVirtualMemberFunctionCheck::registerMatchers(MatchFinder *Finder) {
20   Finder->addMatcher(
21       cxxMethodDecl(ofClass(classTemplateSpecializationDecl(
22                                 unless(isExplicitTemplateSpecialization()))
23                                 .bind("specialization")),
24                     isVirtual(), unless(isUsed()),
25                     unless(cxxDestructorDecl(isDefaulted())))
26           .bind("method"),
27       this);
28 }
29 
30 void TemplateVirtualMemberFunctionCheck::check(
31     const MatchFinder::MatchResult &Result) {
32   const auto *ImplicitSpecialization =
33       Result.Nodes.getNodeAs<ClassTemplateSpecializationDecl>("specialization");
34   const auto *MethodDecl = Result.Nodes.getNodeAs<CXXMethodDecl>("method");
35 
36   diag(MethodDecl->getLocation(),
37        "unspecified virtual member function instantiation; the virtual "
38        "member function is not instantiated but it might be with a "
39        "different compiler");
40   diag(ImplicitSpecialization->getPointOfInstantiation(),
41        "template instantiated here", DiagnosticIDs::Note);
42 }
43 
44 } // namespace clang::tidy::portability
45