1 /*
   2  * Copyright (c) 2016, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.core.test;
  26 
  27 import static org.graalvm.compiler.graph.test.matchers.NodeIterableIsEmpty.isEmpty;
  28 import static org.junit.Assert.assertThat;
  29 
  30 import org.graalvm.compiler.graph.iterators.NodeIterable;
  31 import org.graalvm.compiler.nodes.StructuredGraph;
  32 import org.graalvm.compiler.nodes.java.NewArrayNode;
  33 import org.graalvm.compiler.phases.common.CanonicalizerPhase;
  34 import org.graalvm.compiler.phases.tiers.PhaseContext;
  35 import org.junit.Test;
  36 
  37 public class UnusedArray extends GraalCompilerTest {
  38     @SuppressWarnings("unused")
  39     public void smallArray() {
  40         byte[] array = new byte[3];
  41     }
  42 
  43     @SuppressWarnings("unused")
  44     public void largeArray() {
  45         byte[] array = new byte[10 * 1024 * 1024];
  46     }
  47 
  48     @SuppressWarnings("unused")
  49     public void unknownArray(int l) {
  50         byte[] array = new byte[l];
  51     }
  52 
  53     @Test
  54     public void testSmall() {
  55         test("smallArray");
  56     }
  57 
  58     @Test
  59     public void testLarge() {
  60         test("largeArray");
  61     }
  62 
  63     @Test
  64     public void testUnknown() {
  65         test("unknownArray");
  66     }
  67 
  68     public void test(String method) {
  69         StructuredGraph graph = parseEager(method, StructuredGraph.AllowAssumptions.YES);
  70         new CanonicalizerPhase().apply(graph, new PhaseContext(getProviders()));
  71         NodeIterable<NewArrayNode> newArrayNodes = graph.getNodes().filter(NewArrayNode.class);
  72         assertThat(newArrayNodes, isEmpty());
  73     }
  74 }