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/*
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.graalvm.compiler.api.directives.test;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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import org.junit.Assert;
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import org.junit.Test;
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import org.graalvm.compiler.api.directives.GraalDirectives;
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import org.graalvm.compiler.core.test.GraalCompilerTest;
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import org.graalvm.compiler.nodes.ParameterNode;
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import org.graalvm.compiler.nodes.StructuredGraph;
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import org.graalvm.compiler.phases.OptimisticOptimizations;
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import org.graalvm.compiler.phases.OptimisticOptimizations.Optimization;
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import org.graalvm.compiler.phases.tiers.HighTierContext;
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/**
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* Tests for {@link GraalDirectives#blackhole}.
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*
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* There are two snippets for each kind:
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* <ul>
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* <li>blackhole<Kind>Snippet verifies that dead code elimination is prevented by the
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* blackhole directive.
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* <li><kind>Snippet verifies that dead code elimination does happen if the blackhole
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* directive is not there.
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* </ul>
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*
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*/
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public class BlackholeDirectiveTest extends GraalCompilerTest {
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.METHOD)
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private @interface BlackholeSnippet {
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boolean expectParameterUsage();
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}
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@BlackholeSnippet(expectParameterUsage = false)
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public static int booleanSnippet(int arg) {
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boolean b = arg > 3;
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if (b) {
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return 1;
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} else {
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return 1;
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}
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}
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@BlackholeSnippet(expectParameterUsage = true)
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public static int blackholeBooleanSnippet(int arg) {
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boolean b = arg > 3;
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GraalDirectives.blackhole(b);
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if (b) {
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return 1;
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} else {
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return 1;
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}
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}
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@Test
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public void testBoolean() {
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test("booleanSnippet", 5);
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test("blackholeBooleanSnippet", 5);
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}
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@BlackholeSnippet(expectParameterUsage = false)
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public static int intSnippet(int arg) {
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int x = 42 + arg;
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return x - arg;
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}
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@BlackholeSnippet(expectParameterUsage = true)
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public static int blackholeIntSnippet(int arg) {
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int x = 42 + arg;
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GraalDirectives.blackhole(x);
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return x - arg;
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}
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@Test
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public void testInt() {
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test("intSnippet", 17);
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test("blackholeIntSnippet", 17);
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}
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private static class Dummy {
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private int x = 42;
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}
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@BlackholeSnippet(expectParameterUsage = false)
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public static int objectSnippet(int arg) {
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Dummy obj = new Dummy();
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int ret = obj.x;
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obj.x = arg;
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return ret;
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}
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@BlackholeSnippet(expectParameterUsage = true)
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public static int blackholeObjectSnippet(int arg) {
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Dummy obj = new Dummy();
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int ret = obj.x;
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obj.x = arg;
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GraalDirectives.blackhole(obj);
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return ret;
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}
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@Test
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public void testObject() {
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test("objectSnippet", 37);
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test("blackholeObjectSnippet", 37);
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}
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@Override
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protected HighTierContext getDefaultHighTierContext() {
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return new HighTierContext(getProviders(), getDefaultGraphBuilderSuite(), OptimisticOptimizations.ALL.remove(Optimization.RemoveNeverExecutedCode));
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}
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@Override
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protected void checkLowTierGraph(StructuredGraph graph) {
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BlackholeSnippet snippet = graph.method().getAnnotation(BlackholeSnippet.class);
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ParameterNode arg = graph.getParameter(0);
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if (snippet.expectParameterUsage()) {
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Assert.assertNotNull("couldn't find ParameterNode(0)", arg);
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Assert.assertFalse("expected usages of " + arg, arg.hasNoUsages());
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} else {
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Assert.assertTrue("expected no usages of ParameterNode", arg == null || arg.hasNoUsages());
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}
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}
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}
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