--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/Accessor.java	Fri May 22 13:41:10 2015 +0200
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.impl;
+
+import com.oracle.truffle.api.TruffleLanguage;
+import com.oracle.truffle.api.TruffleLanguage.Env;
+import com.oracle.truffle.api.vm.TruffleVM;
+import com.oracle.truffle.api.source.Source;
+import java.io.IOException;
+import java.util.ServiceLoader;
+
+/**
+ * Communication between TruffleVM and TruffleLanguage API/SPI.
+ */
+public abstract class Accessor {
+    private static Accessor API;
+    private static Accessor SPI;
+    static {
+        TruffleLanguage lng = new TruffleLanguage() {
+            @Override
+            protected Object eval(Source code) throws IOException {
+                return null;
+            }
+
+            @Override
+            protected Object findExportedSymbol(String globalName) {
+                return null;
+            }
+
+            @Override
+            protected Object getLanguageGlobal() {
+                return null;
+            }
+
+            @Override
+            protected boolean isObjectOfLanguage(Object object) {
+                return false;
+            }
+        };
+        lng.hashCode();
+    }
+
+    protected Accessor() {
+        if (this.getClass().getSimpleName().endsWith("API")) {
+            if (API != null) {
+                throw new IllegalStateException();
+            }
+            API = this;
+        } else {
+            if (SPI != null) {
+                throw new IllegalStateException();
+            }
+            SPI = this;
+        }
+    }
+
+    protected Env attachEnv(TruffleVM vm, TruffleLanguage l) {
+        return API.attachEnv(vm, l);
+    }
+
+    protected Object eval(TruffleLanguage l, Source s) throws IOException {
+        return API.eval(l, s);
+    }
+
+    protected Object importSymbol(TruffleVM vm, TruffleLanguage queryingLang, String globalName) {
+        return SPI.importSymbol(vm, queryingLang, globalName);
+    }
+
+    protected Object findExportedSymbol(TruffleLanguage l, String globalName) {
+        return API.findExportedSymbol(l, globalName);
+    }
+
+    protected Object languageGlobal(TruffleLanguage l) {
+        return API.languageGlobal(l);
+    }
+
+    protected Object invoke(Object obj, Object[] args) throws IOException {
+        for (SymbolInvoker si : ServiceLoader.load(SymbolInvoker.class)) {
+            return si.invoke(obj, args);
+        }
+        throw new IOException("No symbol invoker found!");
+    }
+
+}