--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/Signature.java	Wed May 27 00:36:16 2015 +0200
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2009, 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.
+ *
+ * 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;
+
+/**
+ * Represents a method signature provided by the runtime.
+ *
+ * @see <a href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">Method
+ *      Descriptors</a>
+ */
+public interface Signature {
+
+    /**
+     * Returns the number of parameters in this signature, adding 1 for a receiver if requested.
+     *
+     * @param receiver true if 1 is to be added to the result for a receiver
+     * @return the number of parameters; + 1 iff {@code receiver == true}
+     */
+    int getParameterCount(boolean receiver);
+
+    /**
+     * Gets the parameter type at the specified position.
+     *
+     * @param index the index into the parameters, with {@code 0} indicating the first parameter
+     * @param accessingClass the context of the type lookup. If non-null, its class loader is used
+     *            for resolving the type. If {@code null}, then the type returned is either
+     *            unresolved or a resolved type whose resolution is context free (e.g., a primitive
+     *            type or a type in a java.* package).
+     * @return the {@code index}'th parameter type
+     * @throws LinkageError if {@code accessingClass != null} and resolution fails
+     *
+     */
+    JavaType getParameterType(int index, ResolvedJavaType accessingClass);
+
+    /**
+     * Gets the parameter kind at the specified position. This is the same as calling
+     * {@link #getParameterType}. {@link JavaType#getKind getKind}.
+     *
+     * @param index the index into the parameters, with {@code 0} indicating the first parameter
+     * @return the kind of the parameter at the specified position
+     */
+    default Kind getParameterKind(int index) {
+        return getParameterType(index, null).getKind();
+    }
+
+    /**
+     * Gets the return type of this signature.
+     *
+     * @param accessingClass the context of the type lookup. If non-null, its class loader is used
+     *            for resolving the type. If {@code null}, then the type returned is either
+     *            unresolved or a resolved type whose resolution is context free (e.g., a primitive
+     *            type or a type in a java.* package).
+     * @return the return type
+     * @throws LinkageError if {@code accessingClass != null} and resolution fails
+     */
+    JavaType getReturnType(ResolvedJavaType accessingClass);
+
+    /**
+     * Gets the return kind of this signature. This is the same as calling {@link #getReturnType}.
+     * {@link JavaType#getKind getKind}.
+     */
+    default Kind getReturnKind() {
+        return getReturnType(null).getKind();
+    }
+
+    /**
+     * Gets the <a
+     * href="http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.3.3">method
+     * descriptor</a> corresponding to this signature. For example:
+     *
+     * <pre>
+     * (ILjava/lang/String;D)V
+     * </pre>
+     *
+     * @return the signature as a string
+     */
+    default String toMethodDescriptor() {
+        StringBuilder sb = new StringBuilder("(");
+        for (int i = 0; i < getParameterCount(false); ++i) {
+            sb.append(getParameterType(i, null).getName());
+        }
+        sb.append(')').append(getReturnType(null).getName());
+        return sb.toString();
+    }
+
+    default JavaType[] toParameterTypes(JavaType receiverType) {
+        int args = getParameterCount(false);
+        JavaType[] result;
+        int i = 0;
+        if (receiverType != null) {
+            result = new JavaType[args + 1];
+            result[0] = receiverType;
+            i = 1;
+        } else {
+            result = new JavaType[args];
+        }
+        for (int j = 0; j < args; j++) {
+            result[i + j] = getParameterType(j, null);
+        }
+        return result;
+    }
+}