compilerplugins/clang/store/optvalue.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  * Based on LLVM/Clang.
   6  *
   7  * This file is distributed under the University of Illinois Open Source
   8  * License. See LICENSE.TXT for details.
   9  *
  10  */
  11
  12 #include <cassert>
  13 #include <string>
  14 #include <iostream>
  15 #include <fstream>
  16 #include "config_clang.h"
  17 #include "plugin.hxx"
  18 #include "check.hxx"
  19
  20 /*
  21 */
  22
  23 namespace
  24 {
  25 class OptValue : public loplugin::FilteringPlugin<OptValue>
  26 {
  27 public:
  28     explicit OptValue(loplugin::InstantiationData const& data)
  29         : FilteringPlugin(data)
  30     {
  31     }
  32
  33     virtual bool preRun() override { return true; }
  34
  35     virtual void run() override
  36     {
  37         if (preRun())
  38             TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
  39     }
  40
  41     bool VisitCXXMemberCallExpr(const CXXMemberCallExpr*);
  42 };
  43
  44 bool OptValue::VisitCXXMemberCallExpr(const CXXMemberCallExpr* topExpr)
  45 {
  46     if (ignoreLocation(topExpr))
  47         return true;
  48     const CXXMethodDecl* methodDecl = topExpr->getMethodDecl();
  49     if (!methodDecl)
  50         return true;
  51     if (!methodDecl->getIdentifier() || methodDecl->getName() != "value")
  52         return true;
  53     auto expr1 = topExpr->getImplicitObjectArgument()->IgnoreImpCasts();
  54     if (!isa<MaterializeTemporaryExpr>(expr1))
  55         return true;
  56
  57     report(DiagnosticsEngine::Warning, "call to OptValue::value()", topExpr->getBeginLoc());
  58
  59     return true;
  60 }
  61
  62 loplugin::Plugin::Registration<OptValue> optvalue("optvalue", false);
  63
  64 } // namespace
  65
  66 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */