compilerplugins/clang/nestedunnamed.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   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 #ifndef LO_CLANG_SHARED_PLUGINS
  10
  11 #include <cassert>
  12
  13 #include "plugin.hxx"
  14
  15 // Warn about unnamed namespaces nested (directly) within unnamed namespaces.  (It can be hard to
  16 // keep track whether a certain spot in a source file is already in an unnamed namespace, so it
  17 // happens that additions to the source add redundant, nested unnamed namespaces.)
  18
  19 namespace
  20 {
  21 class NestedUnnamed : public loplugin::FilteringPlugin<NestedUnnamed>
  22 {
  23 public:
  24     explicit NestedUnnamed(loplugin::InstantiationData const& data)
  25         : FilteringPlugin(data)
  26     {
  27     }
  28
  29     bool preRun() override { return compiler.getLangOpts().CPlusPlus; }
  30
  31     void run() override
  32     {
  33         if (preRun())
  34         {
  35             TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
  36         }
  37     }
  38
  39     bool VisitNamespaceDecl(NamespaceDecl const* decl)
  40     {
  41         if (ignoreLocation(decl))
  42         {
  43             return true;
  44         }
  45         if (!decl->isAnonymousNamespace())
  46         {
  47             return true;
  48         }
  49         NamespaceDecl const* outer;
  50         for (auto p = decl->getLexicalParent();; p = p->getLexicalParent())
  51         {
  52             outer = dyn_cast<NamespaceDecl>(p);
  53             if (outer != nullptr)
  54             {
  55                 break;
  56             }
  57             if (isa<TranslationUnitDecl>(p))
  58             {
  59                 return true;
  60             }
  61         }
  62         if (!outer->isAnonymousNamespace())
  63         {
  64             return true;
  65         }
  66         report(DiagnosticsEngine::Warning, "unnamed namespace directly nested in unnamed namespace",
  67                decl->getLocation())
  68             << decl->getSourceRange();
  69         report(DiagnosticsEngine::Note, "outer namespace declared here", outer->getLocation())
  70             << outer->getSourceRange();
  71         return true;
  72     }
  73 };
  74
  75 loplugin::Plugin::Registration<NestedUnnamed> nestedunnamed("nestedunnamed");
  76
  77 } // namespace
  78
  79 #endif // LO_CLANG_SHARED_PLUGINS
  80
  81 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */