--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.codegen.test/src/com/oracle/truffle/api/codegen/test/GuardsTest.java	Mon Apr 01 21:43:39 2013 +0200
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2012, 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.truffle.api.codegen.test;
+
+import static com.oracle.truffle.api.codegen.test.TestHelper.*;
+import static junit.framework.Assert.*;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.codegen.*;
+import com.oracle.truffle.api.codegen.test.GuardsTestFactory.GlobalFlagGuardFactory;
+import com.oracle.truffle.api.codegen.test.GuardsTestFactory.InvocationGuardFactory;
+import com.oracle.truffle.api.codegen.test.TypeSystemTest.ChildrenNode;
+import com.oracle.truffle.api.codegen.test.TypeSystemTest.TestRootNode;
+import com.oracle.truffle.api.codegen.test.TypeSystemTest.ValueNode;
+
+@SuppressWarnings("unused")
+public class GuardsTest {
+
+    private static final Object NULL = new Object();
+
+    @Test
+    public void testGuardInvocations() {
+        TestRootNode<InvocationGuard> root = create(InvocationGuardFactory.getInstance());
+
+        assertEquals(Integer.MAX_VALUE, executeWith(root, Integer.MAX_VALUE - 1, 1));
+        assertEquals(1, InvocationGuard.specializedInvocations);
+        assertEquals(0, InvocationGuard.genericInvocations);
+
+        assertEquals(42, executeWith(root, Integer.MAX_VALUE, 1));
+        assertEquals(1, InvocationGuard.specializedInvocations);
+        assertEquals(1, InvocationGuard.genericInvocations);
+    }
+
+    public abstract static class InvocationGuard extends ChildrenNode {
+
+        static int specializedInvocations = 0;
+        static int genericInvocations = 0;
+
+        public InvocationGuard(ValueNode... children) {
+            super(children);
+        }
+
+        public InvocationGuard(InvocationGuard node) {
+            super(node);
+        }
+
+        boolean guard(int value0, int value1) {
+            return value0 != Integer.MAX_VALUE;
+        }
+
+        @Specialization(guards = "guard")
+        int doSpecialized(int value0, int value1) {
+            specializedInvocations++;
+            return value0 + value1;
+        }
+
+        @Generic
+        int doGeneric(Object value0, Object value1) {
+            genericInvocations++;
+            return 42; // the generic answer to all questions
+        }
+    }
+
+    @Test
+    public void testGuardGlobal() {
+        TestRootNode<GlobalFlagGuard> root = create(GlobalFlagGuardFactory.getInstance());
+
+        assertEquals(42, executeWith(root, NULL));
+
+        GlobalFlagGuard.globalFlag = true;
+        assertEquals(41, executeWith(root, NULL));
+
+        GlobalFlagGuard.globalFlag = false;
+        assertEquals(42, executeWith(root, NULL));
+    }
+
+    public abstract static class GlobalFlagGuard extends ChildrenNode {
+
+        static boolean globalFlag = false;
+
+        public GlobalFlagGuard(ValueNode... children) {
+            super(children);
+        }
+
+        public GlobalFlagGuard(GlobalFlagGuard node) {
+            super(node);
+        }
+
+        static boolean globalFlagGuard() {
+            return globalFlag;
+        }
+
+        @Specialization(guards = "globalFlagGuard")
+        int doSpecialized(Object value0) {
+            return 41;
+        }
+
+        @Generic
+        int doGeneric(Object value0) {
+            return 42; // the generic answer to all questions
+        }
+    }
+
+}