1 files changed, 147 insertions, 0 deletions
diff --git a/compilerplugins/clang/fragiledestructor.cxx b/compilerplugins/clang/fragiledestructor.cxx
new file mode 100644
index 000000000..f8ec76a56
--- /dev/null
+++ b/compilerplugins/clang/fragiledestructor.cxx
@@ -0,0 +1,147 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+#ifndef LO_CLANG_SHARED_PLUGINS
+
+#include <string>
+#include <iostream>
+
+#include "plugin.hxx"
+#include "config_clang.h"
+#include "clang/AST/CXXInheritance.h"
+
+
+// Check for calls to virtual methods from destructors. These are dangerous because intention might be to call
+// a method on a subclass, while in actual fact, it only calls the method on the current or super class.
+//
+
+namespace {
+
+class FragileDestructor:
+    public loplugin::FilteringPlugin<FragileDestructor>
+{
+public:
+    explicit FragileDestructor(loplugin::InstantiationData const & data):
+        FilteringPlugin(data) {}
+
+    virtual bool preRun() override
+    {
+        StringRef fn(handler.getMainFileName());
+
+        // TODO, these all need fixing
+
+        if (loplugin::isSamePathname(fn, SRCDIR "/comphelper/source/misc/proxyaggregation.cxx"))
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/svx/source/svdraw/svdpntv.cxx")) // ~SdrPaintView calling ClearPageView
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/svx/source/svdraw/svdobj.cxx")) // ~SdrObject calling GetLastBoundRect
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/svx/source/svdraw/svdedxv.cxx")) // ~SdrObjEditView calling SdrEndTextEdit
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/connectivity/source/drivers/file/FStatement.cxx")) // ~OStatement_Base calling disposing
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/sd/source/core/CustomAnimationEffect.cxx")) // ~EffectSequenceHelper calling reset
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/sd/source/ui/view/sdview.cxx")) // ~View calling DeleteWindowFromPaintView
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/sw/source/core/layout/ssfrm.cxx")) // ~SwFrame calling IsDeleteForbidden
+             return false;
+        if (loplugin::isSamePathname(fn, SRCDIR "/chart2/source/model/template/CandleStickChartType.cxx")) // to ignore <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100797> "[10/11/12 Regression] using declaration causing virtual call with wrongly adjusted this pointer" workaround
+             return false;
+
+        return true;
+    }
+
+    virtual void run() override
+    {
+        if (preRun())
+            TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
+    }
+
+    bool PreTraverseCXXDestructorDecl(CXXDestructorDecl*);
+    bool PostTraverseCXXDestructorDecl(CXXDestructorDecl*, bool);
+    bool TraverseCXXDestructorDecl(CXXDestructorDecl*);
+    bool VisitCXXMemberCallExpr(const CXXMemberCallExpr *);
+
+private:
+    std::vector<CXXDestructorDecl*>  m_vDestructors;
+};
+
+bool FragileDestructor::PreTraverseCXXDestructorDecl(CXXDestructorDecl* cxxDestructorDecl)
+{
+    if (ignoreLocation(cxxDestructorDecl))
+        return true;
+    if (!cxxDestructorDecl->isThisDeclarationADefinition())
+        return true;
+    if (cxxDestructorDecl->getParent()->hasAttr<FinalAttr>())
+        return true;
+    m_vDestructors.push_back(cxxDestructorDecl);
+    return true;
+}
+
+bool FragileDestructor::PostTraverseCXXDestructorDecl(CXXDestructorDecl* cxxDestructorDecl, bool)
+{
+    if (!m_vDestructors.empty() && m_vDestructors.back() == cxxDestructorDecl)
+        m_vDestructors.pop_back();
+    return true;
+}
+
+bool FragileDestructor::TraverseCXXDestructorDecl(CXXDestructorDecl* cxxDestructorDecl)
+{
+    PreTraverseCXXDestructorDecl(cxxDestructorDecl);
+    auto ret = FilteringPlugin::TraverseCXXDestructorDecl(cxxDestructorDecl);
+    PostTraverseCXXDestructorDecl(cxxDestructorDecl, ret);
+    return ret;
+}
+
+bool FragileDestructor::VisitCXXMemberCallExpr(const CXXMemberCallExpr* callExpr)
+{
+    if (m_vDestructors.empty() || ignoreLocation(callExpr))
+        return true;
+    const CXXMethodDecl* methodDecl = callExpr->getMethodDecl();
+    if (!methodDecl->isVirtual() || methodDecl->hasAttr<FinalAttr>())
+        return true;
+    const CXXRecordDecl* parentRecordDecl = methodDecl->getParent();
+    if (parentRecordDecl->hasAttr<FinalAttr>())
+        return true;
+    if (!callExpr->getImplicitObjectArgument()->IgnoreImpCasts()->isImplicitCXXThis())
+        return true;
+
+    // if we see an explicit call to its own method, that's OK
+    auto s1 = compiler.getSourceManager().getCharacterData(callExpr->getBeginLoc());
+    auto s2 = compiler.getSourceManager().getCharacterData(callExpr->getEndLoc());
+    std::string tok(s1, s2-s1);
+    if (tok.find("::") != std::string::npos)
+        return true;
+
+    // Very common pattern that we call acquire/dispose in destructors of UNO objects
+    // to make sure they are cleaned up.
+    if (methodDecl->getName() == "acquire" || methodDecl->getName() == "dispose")
+        return true;
+
+    report(
+        DiagnosticsEngine::Warning,
+        "calling virtual method from destructor, either make the virtual method final, or make this class final",
+        callExpr->getBeginLoc())
+      << callExpr->getSourceRange();
+    report(
+        DiagnosticsEngine::Note,
+        "callee method here",
+        methodDecl->getBeginLoc())
+      << methodDecl->getSourceRange();
+    return true;
+}
+
+
+loplugin::Plugin::Registration<FragileDestructor> fragiledestructor("fragiledestructor");
+
+}
+
+#endif // LO_CLANG_SHARED_PLUGINS
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */