compilerplugins/clang/store/deadclass.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include "plugin.hxx"
  11
  12 namespace {
  13
  14 class DeadClass:
  15     public loplugin::FilteringPlugin<DeadClass>
  16 {
  17 public:
  18     explicit DeadClass(InstantiationData const & data): FilteringPlugin(data) {}
  19
  20     void run() override;
  21
  22     bool VisitCXXRecordDecl(CXXRecordDecl const *);
  23 };
  24
  25 void DeadClass::run() {
  26     if (compiler.getLangOpts().CPlusPlus) {
  27         TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
  28     }
  29 }
  30
  31 bool DeadClass::VisitCXXRecordDecl(CXXRecordDecl const * decl) {
  32     if (ignoreLocation(decl) || !decl->isThisDeclarationADefinition())
  33         return true;
  34     if (decl->needsImplicitDefaultConstructor())
  35         return true;
  36     if (decl->getDescribedClassTemplate())
  37         return true;
  38     if (isa<ClassTemplateSpecializationDecl>(decl))
  39         return true;
  40     int otherCnt = 0;
  41     int copyMoveCnt = 0;
  42     for (auto i = decl->ctor_begin(); i != decl->ctor_end(); ++i) {
  43         if (!i->isUserProvided())
  44             continue;
  45         if (i->isCopyOrMoveConstructor())
  46             copyMoveCnt++;
  47         else
  48             otherCnt++;
  49     }
  50     if (otherCnt == 0 && copyMoveCnt > 0)
  51     {
  52         report(
  53             DiagnosticsEngine::Warning,
  54             "class has only copy/move constructors, must be dead",
  55             decl->getLocStart())
  56             << decl->getSourceRange();
  57         for (auto i = decl->ctor_begin(); i != decl->ctor_end(); ++i) {
  58             if (i->isDeleted())
  59                 continue;
  60         }
  61     }
  62     return true;
  63 }
  64
  65 loplugin::Plugin::Registration<DeadClass> X("deadclass");
  66
  67 }
  68
  69 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */