clang-tools-extra/clang-tidy/portability/TemplateVirtualMemberFunctionCheck.cpp

   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