--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/truffle/com.oracle.truffle.api/src/com/oracle/truffle/api/TruffleRuntime.java	Wed Jun 17 10:58:08 2015 +0200
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2012, 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;
+
+import java.util.*;
+
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * Interface representing a Truffle runtime object. The runtime is responsible for creating call
+ * targets and performing optimizations for them.
+ */
+public interface TruffleRuntime {
+
+    /**
+     * Name describing this runtime implementation for debugging purposes.
+     *
+     * @return the name as a String
+     */
+    String getName();
+
+    /**
+     * Creates a new call target for a given root node.
+     *
+     * @param rootNode the root node whose
+     *            {@link RootNode#execute(com.oracle.truffle.api.frame.VirtualFrame)} method
+     *            represents the entry point
+     * @return the new call target object
+     */
+    RootCallTarget createCallTarget(RootNode rootNode);
+
+    /**
+     * Creates a new runtime specific version of {@link DirectCallNode}.
+     *
+     * @param target the direct {@link CallTarget} to call
+     * @return the new call node
+     */
+    DirectCallNode createDirectCallNode(CallTarget target);
+
+    /**
+     * Experimental API. May change without notice.
+     */
+    LoopNode createLoopNode(RepeatingNode body);
+
+    /**
+     * Creates a new runtime specific version of {@link IndirectCallNode}.
+     *
+     * @return the new call node
+     */
+    IndirectCallNode createIndirectCallNode();
+
+    /**
+     * Creates a new assumption object that can be checked and invalidated.
+     *
+     * @return the newly created assumption object
+     */
+    Assumption createAssumption();
+
+    /**
+     * Creates a new assumption object with a given name that can be checked and invalidated.
+     *
+     * @param name the name for the new assumption
+     * @return the newly created assumption object
+     */
+    Assumption createAssumption(String name);
+
+    /**
+     * Creates a new virtual frame object that can be used to store values and is potentially
+     * optimizable by the runtime.
+     *
+     * @return the newly created virtual frame object
+     */
+    VirtualFrame createVirtualFrame(Object[] arguments, FrameDescriptor frameDescriptor);
+
+    /**
+     * Creates a new materialized frame object that can be used to store values.
+     *
+     * @return the newly created materialized frame object
+     */
+    MaterializedFrame createMaterializedFrame(Object[] arguments);
+
+    /**
+     * Creates a new materialized frame object with the given frame descriptor that can be used to
+     * store values.
+     *
+     * @param frameDescriptor the frame descriptor describing this frame's values
+     * @return the newly created materialized frame object
+     */
+    MaterializedFrame createMaterializedFrame(Object[] arguments, FrameDescriptor frameDescriptor);
+
+    /**
+     * Creates an object which allows you to test for support of and set options specific for this
+     * runtime.
+     *
+     * @return the newly created compiler options object
+     */
+    CompilerOptions createCompilerOptions();
+
+    /**
+     * Accesses the current stack, i.e., the contents of the {@link Frame}s and the associated
+     * {@link CallTarget}s. Iteration starts at the caller frame, i.e., it does not include the
+     * current frame.
+     *
+     * Iteration continues as long as {@link FrameInstanceVisitor#visitFrame}, which is invoked for
+     * every {@link FrameInstance}, returns null. Any non-null result of the visitor indicates that
+     * frame iteration should stop.
+     *
+     * @param visitor the visitor that is called for every matching frame.
+     * @return the last result returned by the visitor (which is non-null to indicate that iteration
+     *         should stop), or null if the whole stack was iterated.
+     */
+    <T> T iterateFrames(FrameInstanceVisitor<T> visitor);
+
+    /**
+     * Accesses the caller frame. This is a convenience method that returns the first frame that is
+     * passed to the visitor of {@link #iterateFrames}.
+     */
+    FrameInstance getCallerFrame();
+
+    /**
+     * Accesses the current frame, i.e., the frame of the closest {@link CallTarget}. It is
+     * important to note that this {@link FrameInstance} supports only slow path access.
+     */
+    FrameInstance getCurrentFrame();
+
+    /**
+     * Requests a capability from the runtime.
+     *
+     * @param capability the type of the interface representing the capability
+     * @return an implementation of the capability or {@code null} if the runtime does not offer it
+     */
+    <T> T getCapability(Class<T> capability);
+
+    /**
+     * Returns a list of all still referenced {@link RootCallTarget} instances that were created
+     * using {@link #createCallTarget(RootNode)}.
+     */
+    Collection<RootCallTarget> getCallTargets();
+
+    /**
+     * Internal API method. Do not use.
+     */
+    void notifyTransferToInterpreter();
+
+}