1 files changed, 133 insertions, 0 deletions
diff --git a/compilerplugins/clang/oslendian.cxx b/compilerplugins/clang/oslendian.cxx
new file mode 100644
index 0000000000..13296330ba
--- /dev/null
+++ b/compilerplugins/clang/oslendian.cxx
@@ -0,0 +1,133 @@
+/* -*- 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/.
+ */
+
+#include <cassert>
+#include <memory>
+
+#include "plugin.hxx"
+
+namespace {
+
+class OslEndian: public loplugin::Plugin, public PPCallbacks {
+public:
+    explicit OslEndian(loplugin::InstantiationData const & data): Plugin(data) {
+        compiler.getPreprocessor().addPPCallbacks(std::unique_ptr<PPCallbacks>(this));
+    }
+
+    enum { isPPCallback = true };
+
+private:
+    void run() override {}
+
+    virtual void FileChanged(SourceLocation, FileChangeReason, SrcMgr::CharacteristicKind, FileID) override {
+        if(!startChecked) {
+            // With precompiled headers MacroDefined() would not be called, so check already at the very
+            // start whether the macros exist.
+            startChecked = true;
+            if(const MacroInfo* macroBig = compiler.getPreprocessor().getMacroInfo(
+                &compiler.getPreprocessor().getIdentifierTable().get("OSL_BIGENDIAN"))) {
+                definedBig_ = macroBig->getDefinitionLoc();
+            }
+            if(const MacroInfo* macroLit = compiler.getPreprocessor().getMacroInfo(
+                &compiler.getPreprocessor().getIdentifierTable().get("OSL_LITENDIAN"))) {
+                definedLit_ = macroLit->getDefinitionLoc();
+            }
+        }
+    }
+
+    void MacroDefined(Token const & MacroNameTok, MacroDirective const *)
+        override
+    {
+        auto id = MacroNameTok.getIdentifierInfo()->getName();
+        if (id == "OSL_BIGENDIAN") {
+            if (definedLit_.isValid()) {
+                report(
+                    DiagnosticsEngine::Warning,
+                    "macro %0 defined in addition to 'OSL_LITENDIAN'",
+                    MacroNameTok.getLocation())
+                    << MacroNameTok.getIdentifierInfo();
+                report(
+                    DiagnosticsEngine::Note,
+                    "conflicting macro definition is here", definedLit_);
+            }
+            definedBig_ = MacroNameTok.getLocation();
+            assert(definedBig_.isValid());
+        } else if (id == "OSL_LITENDIAN") {
+            if (definedBig_.isValid()) {
+                report(
+                    DiagnosticsEngine::Warning,
+                    "macro %0 defined in addition to 'OSL_BIGENDIAN'",
+                    MacroNameTok.getLocation())
+                    << MacroNameTok.getIdentifierInfo();
+                report(
+                    DiagnosticsEngine::Note,
+                    "conflicting macro definition is here", definedBig_);
+            }
+            definedLit_ = MacroNameTok.getLocation();
+            assert(definedLit_.isValid());
+        }
+    }
+
+    void MacroUndefined(
+        Token const & MacroNameTok, MacroDefinition const &, MacroDirective const *) override
+    {
+        auto id = MacroNameTok.getIdentifierInfo()->getName();
+        if (id == "OSL_BIGENDIAN" || id == "OSL_LITENDIAN") {
+            report(
+                DiagnosticsEngine::Warning, "macro %0 undefinition",
+                MacroNameTok.getLocation())
+                << MacroNameTok.getIdentifierInfo();
+        }
+    }
+
+    void Defined(
+        Token const & MacroNameTok, MacroDefinition const &, SourceRange)
+        override
+    {
+        check(MacroNameTok);
+    }
+
+    void Ifdef(
+        SourceLocation, Token const & MacroNameTok,
+        MacroDefinition const &) override
+    {
+        check(MacroNameTok);
+    }
+
+    void Ifndef(
+        SourceLocation, Token const & MacroNameTok,
+        MacroDefinition const &) override
+    {
+        check(MacroNameTok);
+    }
+
+    void check(Token const & macro) const {
+        auto id = macro.getIdentifierInfo()->getName();
+        if ((id == "OSL_BIGENDIAN" || id == "OSL_LITENDIAN")
+            && definedBig_.isInvalid() && definedLit_.isInvalid())
+        {
+            report(
+                DiagnosticsEngine::Warning,
+                "definition of macro %0 checked but 'osl/endian.h' is not"
+                    " included",
+                macro.getLocation())
+                << macro.getIdentifierInfo();
+        }
+    }
+
+    SourceLocation definedBig_;
+    SourceLocation definedLit_;
+    bool startChecked = false;
+};
+
+loplugin::Plugin::Registration<OslEndian> X("oslendian");
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */