--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/RiSignature.java	Thu Jun 07 18:24:06 2012 +0200
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2009, 2011, 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.graal.api.meta;
+
+/**
+ * Represents a method signature provided by the runtime.
+ *
+ * @see <a href="http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html#7035">Method Descriptors</a>
+ */
+public interface RiSignature {
+    /**
+     * Gets the number of arguments 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 arguments + 1 iff {@code receiver == true}
+     */
+    int argumentCount(boolean receiver);
+
+    /**
+     * Gets the argument type at the specified position. This method will return a
+     * {@linkplain RiType#isResolved() resolved} type if possible but without
+     * triggering any class loading or resolution.
+     *
+     * @param index the index into the parameters, with {@code 0} indicating the first parameter
+     * @param accessingClass the context of the type lookup. If accessing class is resolved, its class loader
+     *        is used to retrieve an existing resolved type. This value can be {@code null} if the caller does
+     *        not care for a resolved type.
+     * @return the {@code index}'th argument type
+     */
+    RiType argumentTypeAt(int index, RiResolvedType accessingClass);
+
+    /**
+     * Gets the argument kind at the specified position.
+     * @param index the index into the parameters, with {@code 0} indicating the first parameter
+     * @param architecture When true, the architecture-specific kind used for emitting machine code is returned.
+     *        When false, the kind according to the Java specification is returned.
+     * @return the kind of the argument at the specified position
+     */
+    RiKind argumentKindAt(int index, boolean architecture);
+
+    /**
+     * Gets the return type of this signature. This method will return a
+     * {@linkplain RiResolvedType resolved} type if possible but without
+     * triggering any class loading or resolution.
+     *
+     * @param accessingClass the context of the type lookup. If accessing class is resolved, its class loader
+     *        is used to retrieve an existing resolved type. This value can be {@code null} if the caller does
+     *        not care for a resolved type.
+     * @return the compiler interface type representing the return type
+     */
+    RiType returnType(RiType accessingClass);
+
+    /**
+     * Gets the return kind of this signature.
+     * @param architectureSpecific When true, the architecture-specific kind used for emitting machine code is returned.
+     *        When false, the kind according to the Java specification is returned.
+     * @return the return kind
+     */
+    RiKind returnKind(boolean architectureSpecific);
+
+    /**
+     * Converts this signature to a string.
+     * @return the signature as a string
+     */
+    String asString();
+
+    /**
+     * Gets the size, in Java slots, of the arguments to this signature.
+     * @param withReceiver {@code true} if to add a slot for a receiver object; {@code false} not to include the receiver
+     * @return the size of the arguments in slots
+     */
+    int argumentSlots(boolean withReceiver);
+}