| /* |
| * 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<Kind>Snippet verifies that dead code elimination is prevented by the |
| * blackhole directive. |
| * <li><kind>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; |
| } |
| } |