1 files changed, 102 insertions, 0 deletions
diff --git a/compilerplugins/clang/salunicodeliteral.cxx b/compilerplugins/clang/salunicodeliteral.cxx
new file mode 100644
index 000000000..4c2a00669
--- /dev/null
+++ b/compilerplugins/clang/salunicodeliteral.cxx
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * 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 "check.hxx"
+#include "plugin.hxx"
+
+namespace {
+
+bool isAsciiCharacterLiteral(Expr const * expr) {
+    if (auto const e = dyn_cast<CharacterLiteral>(expr)) {
+        return e->getKind() == CharacterLiteral::Ascii;
+    }
+    return false;
+}
+
+class SalUnicodeLiteral final:
+    public loplugin::FilteringPlugin<SalUnicodeLiteral>
+{
+public:
+    explicit SalUnicodeLiteral(loplugin::InstantiationData const & data):
+        FilteringPlugin(data) {}
+
+    bool VisitCXXStaticCastExpr(CXXStaticCastExpr const * expr) {
+        check(expr);
+        return true;
+    }
+
+    bool VisitCXXFunctionalCastExpr(CXXFunctionalCastExpr const * expr) {
+        check(expr);
+        return true;
+    }
+
+    bool VisitCStyleCastExpr(CStyleCastExpr const * expr) {
+        check(expr);
+        return true;
+    }
+
+    bool preRun() override {
+        return compiler.getLangOpts().CPlusPlus
+            && compiler.getPreprocessor().getIdentifierInfo(
+                "LIBO_INTERNAL_ONLY")->hasMacroDefinition();
+    }
+
+    void run() override {
+        if (preRun())
+            TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
+    }
+
+private:
+    void check(ExplicitCastExpr const * expr) {
+        if (ignoreLocation(expr)
+            || isInUnoIncludeFile(expr->getExprLoc()))
+                //TODO: '#ifdef LIBO_INTERNAL_ONLY' within UNO include files
+        {
+            return;
+        }
+        for (auto t = expr->getTypeAsWritten();;) {
+            auto const tt = t->getAs<TypedefType>();
+            if (tt == nullptr) {
+                return;
+            }
+            if (loplugin::TypeCheck(t).Typedef("sal_Unicode")
+                .GlobalNamespace())
+            {
+                break;
+            }
+            t = tt->desugar();
+        }
+        auto const e1 = expr->getSubExprAsWritten();
+        auto const loc = compat::getBeginLoc(e1);
+        if (loc.isMacroID()
+            && compiler.getSourceManager().isAtStartOfImmediateMacroExpansion(
+                loc))
+        {
+            return;
+        }
+        auto const e2 = e1->IgnoreParenImpCasts();
+        if (isAsciiCharacterLiteral(e2) || isa<IntegerLiteral>(e2)) {
+            report(
+                DiagnosticsEngine::Warning,
+                ("in LIBO_INTERNAL_ONLY code, replace literal cast to %0 with a"
+                 " u'...' char16_t character literal"),
+                e2->getExprLoc())
+                << expr->getTypeAsWritten() << expr->getSourceRange();
+        }
+    }
+};
+
+static loplugin::Plugin::Registration<SalUnicodeLiteral> salunicodeliteral("salunicodeliteral");
+
+} // namespace
+
+#endif // LO_CLANG_SHARED_PLUGINS
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */