1 files changed, 86 insertions, 0 deletions
diff --git a/compilerplugins/clang/dllprivate.cxx b/compilerplugins/clang/dllprivate.cxx
new file mode 100644
index 0000000000..5fbace1010
--- /dev/null
+++ b/compilerplugins/clang/dllprivate.cxx
@@ -0,0 +1,86 @@
+/* -*- 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 "plugin.hxx"
+
+namespace {
+
+class DllPrivate final:
+    public loplugin::FilteringPlugin<DllPrivate>
+{
+public:
+    explicit DllPrivate(loplugin::InstantiationData const & data): FilteringPlugin(data)
+    {}
+
+    bool VisitNamedDecl(NamedDecl const * decl) {
+        if (!decl->getLocation().isInvalid()&&ignoreLocation(decl)) {
+            return true;
+        }
+        auto a = decl->getAttr<VisibilityAttr>();
+        if (a == nullptr || a->getVisibility() != VisibilityAttr::Hidden) {
+            return true;
+        }
+        if (compiler.getSourceManager().isMacroBodyExpansion(
+                decl->getLocation())
+            && (Lexer::getImmediateMacroName(
+                    decl->getLocation(), compiler.getSourceManager(),
+                    compiler.getLangOpts())
+                == "Q_OBJECT")) // from /usr/include/QtCore/qobjectdefs.h
+        {
+            return true;
+        }
+        auto p = dyn_cast<RecordDecl>(decl->getDeclContext());
+        if (p == nullptr) {
+            report(
+                DiagnosticsEngine::Warning,
+                "top-level declaration redundantly marked as DLLPRIVATE",
+                a->getLocation())
+                << decl->getSourceRange();
+        } else if (p->getVisibility() == HiddenVisibility) {
+            report(
+                DiagnosticsEngine::Warning,
+                ("declaration nested in DLLPRIVATE declaration redundantly"
+                 " marked as DLLPRIVATE"),
+                a->getLocation())
+                << decl->getSourceRange();
+            report(
+                DiagnosticsEngine::Note, "parent declaration is here",
+                p->getLocation())
+                << p->getSourceRange();
+        }
+        return true;
+    }
+
+    bool preRun() override {
+        // DISABLE_DYNLOADING makes SAL_DLLPUBLIC_{EXPORT,IMPORT,TEMPLATE} expand
+        // to visibility("hidden") attributes, which would cause bogus warnings
+        // here (e.g., in UBSan builds that explicitly define DISABLE_DYNLOADING
+        // in jurt/source/pipe/staticsalhack.cxx); alternatively, change
+        // include/sal/types.h to make those SAL_DLLPUBLIC_* expand to nothing
+        // for DISABLE_DYNLOADING:
+        return !compiler.getPreprocessor().getIdentifierInfo("DISABLE_DYNLOADING")
+            ->hasMacroDefinition();
+    }
+
+    void run() override {
+        if (preRun()) {
+            TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
+        }
+    }
+};
+
+static loplugin::Plugin::Registration<DllPrivate> dllprivate("dllprivate");
+
+} // namespace
+
+#endif // LO_CLANG_SHARED_PLUGINS
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */