--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/MetaAccessProvider.java	Wed May 27 00:36:16 2015 +0200
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2012, 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.
+ *
+ * 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.jvmci.meta;
+
+import java.lang.reflect.*;
+
+/**
+ * Provides access to the metadata of a class typically provided in a class file.
+ */
+public interface MetaAccessProvider {
+
+    /**
+     * Returns the resolved Java type representing a given Java class.
+     *
+     * @param clazz the Java class object
+     * @return the resolved Java type object
+     */
+    ResolvedJavaType lookupJavaType(Class<?> clazz);
+
+    /**
+     * Returns the resolved Java types representing some given Java classes.
+     *
+     * @param classes the Java class objects
+     * @return the resolved Java type objects
+     */
+    default ResolvedJavaType[] lookupJavaTypes(Class<?>[] classes) {
+        ResolvedJavaType[] result = new ResolvedJavaType[classes.length];
+        for (int i = 0; i < result.length; i++) {
+            result[i] = lookupJavaType(classes[i]);
+        }
+        return result;
+    }
+
+    /**
+     * Provides the {@link ResolvedJavaMethod} for a {@link Method} or {@link Constructor} obtained
+     * via reflection.
+     */
+    ResolvedJavaMethod lookupJavaMethod(Executable reflectionMethod);
+
+    /**
+     * Provides the {@link ResolvedJavaField} for a {@link Field} obtained via reflection.
+     */
+    ResolvedJavaField lookupJavaField(Field reflectionField);
+
+    /**
+     * Returns the resolved Java type of the given {@link JavaConstant} object.
+     *
+     * @return {@code null} if {@code constant.isNull() || !constant.kind.isObject()}
+     */
+    ResolvedJavaType lookupJavaType(JavaConstant constant);
+
+    /**
+     * Returns the number of bytes occupied by this constant value or constant object.
+     *
+     * @param constant the constant whose bytes should be measured
+     * @return the number of bytes occupied by this constant
+     */
+    long getMemorySize(JavaConstant constant);
+
+    /**
+     * Parses a <a
+     * href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">method
+     * descriptor</a> into a {@link Signature}. The behavior of this method is undefined if the
+     * method descriptor is not well formed.
+     */
+    Signature parseMethodDescriptor(String methodDescriptor);
+
+    /**
+     * Encodes a deoptimization action and a deoptimization reason in an integer value.
+     *
+     * @param debugId an integer that can be used to track the origin of a deoptimization at
+     *            runtime. There is no guarantee that the runtime will use this value. The runtime
+     *            may even keep fewer than 32 bits.
+     *
+     * @return the encoded value as an integer
+     */
+    JavaConstant encodeDeoptActionAndReason(DeoptimizationAction action, DeoptimizationReason reason, int debugId);
+
+    DeoptimizationReason decodeDeoptReason(JavaConstant constant);
+
+    DeoptimizationAction decodeDeoptAction(JavaConstant constant);
+
+    int decodeDebugId(JavaConstant constant);
+}