--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.api.directives.test/src/org/graalvm/compiler/api/directives/test/BlackholeDirectiveTest.java	Thu Feb 16 15:46:09 2017 -0800
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2015, 2015, 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 org.graalvm.compiler.api.directives.test;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import org.graalvm.compiler.api.directives.GraalDirectives;
+import org.graalvm.compiler.core.test.GraalCompilerTest;
+import org.graalvm.compiler.nodes.ParameterNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+
+/**
+ * Tests for {@link GraalDirectives#blackhole}.
+ *
+ * There are two snippets for each kind:
+ * <ul>
+ * <li>blackhole&lt;Kind&gt;Snippet verifies that dead code elimination is prevented by the
+ * blackhole directive.
+ * <li>&lt;kind&gt;Snippet verifies that dead code elimination does happen if the blackhole
+ * directive is not there.
+ * </ul>
+ *
+ */
+public class BlackholeDirectiveTest extends GraalCompilerTest {
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.METHOD)
+    private @interface BlackholeSnippet {
+        boolean expectParameterUsage();
+    }
+
+    @BlackholeSnippet(expectParameterUsage = false)
+    public static int booleanSnippet(int arg) {
+        boolean b = arg > 3;
+        if (b) {
+            return 1;
+        } else {
+            return 1;
+        }
+    }
+
+    @BlackholeSnippet(expectParameterUsage = true)
+    public static int blackholeBooleanSnippet(int arg) {
+        boolean b = arg > 3;
+        GraalDirectives.blackhole(b);
+        if (b) {
+            return 1;
+        } else {
+            return 1;
+        }
+    }
+
+    @Test
+    public void testBoolean() {
+        test("booleanSnippet", 5);
+        test("blackholeBooleanSnippet", 5);
+    }
+
+    @BlackholeSnippet(expectParameterUsage = false)
+    public static int intSnippet(int arg) {
+        int x = 42 + arg;
+        return x - arg;
+    }
+
+    @BlackholeSnippet(expectParameterUsage = true)
+    public static int blackholeIntSnippet(int arg) {
+        int x = 42 + arg;
+        GraalDirectives.blackhole(x);
+        return x - arg;
+    }
+
+    @Test
+    public void testInt() {
+        test("intSnippet", 17);
+        test("blackholeIntSnippet", 17);
+    }
+
+    private static class Dummy {
+        private int x = 42;
+    }
+
+    @BlackholeSnippet(expectParameterUsage = false)
+    public static int objectSnippet(int arg) {
+        Dummy obj = new Dummy();
+        int ret = obj.x;
+        obj.x = arg;
+        return ret;
+    }
+
+    @BlackholeSnippet(expectParameterUsage = true)
+    public static int blackholeObjectSnippet(int arg) {
+        Dummy obj = new Dummy();
+        int ret = obj.x;
+        obj.x = arg;
+        GraalDirectives.blackhole(obj);
+        return ret;
+    }
+
+    @Test
+    public void testObject() {
+        test("objectSnippet", 37);
+        test("blackholeObjectSnippet", 37);
+    }
+
+    @Override
+    protected boolean checkLowTierGraph(StructuredGraph graph) {
+        BlackholeSnippet snippet = graph.method().getAnnotation(BlackholeSnippet.class);
+        ParameterNode arg = graph.getParameter(0);
+        if (snippet.expectParameterUsage()) {
+            Assert.assertNotNull("couldn't find ParameterNode(0)", arg);
+            Assert.assertFalse("expected usages of " + arg, arg.hasNoUsages());
+        } else {
+            Assert.assertTrue("expected no usages of ParameterNode", arg == null || arg.hasNoUsages());
+        }
+        return true;
+    }
+}