compilerplugins: add "badstatics" to detect abuse of VCL Bitmaps

VCL Image/Bitmap/BitmapEx instances must not have static life-time
because then they will be destructed after DeInitVCL() and that
likely segfaults.

Change-Id: I3ff8d32de729c971b190028094cb4efe206395e2

1 files changed, 57 insertions, 0 deletions

diff --git a/compilerplugins/clang/badstatics.cxx b/compilerplugins/clang/badstatics.cxx
new file mode 100644
index 000000000000..136e1db90d20
--- /dev/null
+++ b/compilerplugins/clang/badstatics.cxx
@@ -0,0 +1,57 @@
+/* -*- 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/.
+ */
+
+#include "plugin.hxx"
+
+namespace {
+
+class BadStatics
+    : public clang::RecursiveASTVisitor<BadStatics>
+    , public loplugin::Plugin
+{
+
+public:
+    explicit BadStatics(InstantiationData const& rData) : Plugin(rData) {}
+
+    void run() override {
+        if (compiler.getLangOpts().CPlusPlus) { // no non-trivial dtors in C
+            TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
+        }
+    }
+
+    bool VisitVarDecl(VarDecl const*const pVarDecl)
+    {
+        if (ignoreLocation(pVarDecl)) {
+            return true;
+        }
+
+        if (pVarDecl->hasGlobalStorage()) {
+            auto const type(pVarDecl->getType().getUnqualifiedType().getCanonicalType().getAsString());
+            if (   type == "class Image"
+                || type == "class Bitmap"
+                || type == "class BitmapEx"
+               )
+            {
+                report(DiagnosticsEngine::Warning,
+                        "bad static variable causes crash on shutdown",
+                        pVarDecl->getLocation())
+                    << pVarDecl->getSourceRange();
+            }
+        }
+
+        return true;
+    }
+
+};
+
+loplugin::Plugin::Registration<BadStatics> X("badstatics");
+
+} // namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */