--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.max.cri/src/com/oracle/max/cri/intrinsics/IntrinsicImpl.java	Sat Dec 17 19:59:18 2011 +0100
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2011, 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.max.cri.intrinsics;
+
+import java.util.*;
+import java.util.Map.*;
+import java.util.concurrent.*;
+
+import com.sun.cri.ci.*;
+import com.sun.cri.ri.*;
+
+/**
+ * Empty marker interface for intrinsic implementations.
+ *
+ * Note: It is not necessary that this class is in the CRI, it could also be part of the compiler
+ * implementation.  However, it might be useful for different compilers, so it is here for now.
+ */
+public interface IntrinsicImpl {
+
+    /**
+     * Registry that maps intrinsic ID strings to implementation objects.
+     * Intrinsic ID strings can either be explicitly defined as String constants, or inferred from the
+     * fully qualified name and signature of a method.
+     */
+    public class Registry implements Iterable<Map.Entry<String, IntrinsicImpl>> {
+        private Map<String, IntrinsicImpl> implRegistry = new ConcurrentHashMap<String, IntrinsicImpl>(100, 0.75f, 1);
+
+        /**
+         * Add an implementation object for an explicitly defined intrinsic ID string.
+         */
+        public void add(String intrinsicId, IntrinsicImpl impl) {
+            assert !implRegistry.containsKey(intrinsicId);
+            implRegistry.put(intrinsicId, impl);
+        }
+
+        /**
+         * Add an implementation object for an intrinsic implicitly defined by its fully qualified name and signature.
+         */
+        public void add(String className, String methodName, String signature, IntrinsicImpl impl) {
+            add(literalId(className, methodName, signature), impl);
+        }
+
+        /**
+         * Gets the implementation object for a method. First, the {@link RiMethod#intrinsic() explicit ID string} of the
+         * method is searched in the registry, then the implicit ID inferred from the method name and signature.
+         * @return The intrinsic implementation object, or {@code null} if none is found.
+         */
+        public IntrinsicImpl get(RiResolvedMethod method) {
+            String intrinsic = method.intrinsic();
+            if (intrinsic != null) {
+                IntrinsicImpl impl = implRegistry.get(intrinsic);
+                if (impl != null) {
+                    return impl;
+                }
+            }
+            return implRegistry.get(literalId(method));
+        }
+
+
+        private static String literalId(String className, String methodName, String signature) {
+            return CiUtil.toInternalName(className) + methodName + signature;
+        }
+
+        private static String literalId(RiMethod method) {
+            return method.holder().name() + method.name() + method.signature().asString();
+        }
+
+        @Override
+        public Iterator<Entry<String, IntrinsicImpl>> iterator() {
+            return implRegistry.entrySet().iterator();
+        }
+    }
+}