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-rw-r--r--compilerplugins/clang/store/unusedcode.cxx77
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diff --git a/compilerplugins/clang/store/unusedcode.cxx b/compilerplugins/clang/store/unusedcode.cxx
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+++ b/compilerplugins/clang/store/unusedcode.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * Based on LLVM/Clang.
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ */
+
+/*
+This is technically a rewriter, but it actually only generates data about code.
+
+This is incomplete.
+
+Checks for all function declarations for whether they are used or not. This information
+should be output to files and in a second pass it should be checked (by another tool)
+which functions are never used.
+*/
+
+#include "plugin.hxx"
+
+namespace loplugin
+{
+
+class UnusedCode
+ : public loplugin::FilteringRewritePlugin< UnusedCode >
+ {
+ public:
+ explicit UnusedCode( CompilerInstance& compiler, Rewriter& rewriter );
+ virtual void run() override;
+ bool VisitFunctionDecl( const FunctionDecl* declaration );
+ };
+
+UnusedCode::UnusedCode( CompilerInstance& compiler, Rewriter& rewriter )
+ : FilteringRewritePlugin( compiler, rewriter )
+ {
+ }
+
+void UnusedCode::run()
+ {
+ TraverseDecl( compiler.getASTContext().getTranslationUnitDecl());
+ }
+
+bool UnusedCode::VisitFunctionDecl( const FunctionDecl* declaration )
+ {
+ if( ignoreLocation( declaration ))
+ return true;
+ bool isUsed = declaration->isUsed();
+ if( const CXXMethodDecl* cxxmethod = dyn_cast< CXXMethodDecl >( declaration ))
+ {
+ if( !isUsed && cxxmethod->isVirtual())
+ { // Virtual methods are used also if a method they override is used.
+ for( CXXMethodDecl::method_iterator it = cxxmethod->begin_overridden_methods();
+ it != cxxmethod->end_overridden_methods();
+ ++it )
+ {
+ if( (*it)->isUsed())
+ {
+ isUsed = true;
+ break;
+ }
+ }
+ }
+ }
+ // Fully qualified name: declaration->getQualifiedNameAsString()
+ // Is used: isUsed
+ // The main source file compiled: compiler.getSourceManager().getFileEntryForID( compiler.getSourceManager().getMainFileID())->getName()
+ return true;
+ }
+
+static Plugin::Registration< UnusedCode > X( "unusedcode" );
+
+} // namespace
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */