1 /* 2 * Copyright (c) 2011, 2018, 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 org.graalvm.compiler.debug.DebugContext; 28 import org.graalvm.compiler.debug.DebugDumpScope; 29 import org.graalvm.compiler.nodes.StructuredGraph; 30 import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions; 31 import org.graalvm.compiler.phases.common.CanonicalizerPhase; 32 import org.graalvm.compiler.phases.tiers.HighTierContext; 33 import org.junit.Test; 34 35 /** 36 * In the following tests, the usages of local variable "a" are replaced with the integer constant 37 * 0. Then canonicalization is applied and it is verified that the resulting graph is equal to the 38 * graph of the method that just has a "return 1" statement in it. 39 */ 40 public class DegeneratedLoopsTest extends GraalCompilerTest { 41 42 private static final String REFERENCE_SNIPPET = "referenceSnippet"; 43 44 @SuppressWarnings("all") 45 public static int referenceSnippet(int a) { 46 return a; 47 } 48 49 @Test 50 public void test1() { 51 test("test1Snippet"); 52 } 53 54 private static class UnresolvedException extends RuntimeException { 55 56 private static final long serialVersionUID = 5215434338750728440L; 57 58 static { 59 if (true) { 60 throw new UnsupportedOperationException("this class may never be initialized"); 61 } 62 } 63 } 64 65 @SuppressWarnings("all") 66 public static int test1Snippet(int a) { 67 for (;;) { 68 try { 69 test(); 70 break; 71 } catch (UnresolvedException e) { 72 } 73 } 74 return a; 75 } 76 77 private static void test() { 78 79 } 80 81 @SuppressWarnings("try") 82 private void test(final String snippet) { 83 DebugContext debug = getDebugContext(); 84 try (DebugContext.Scope s = debug.scope("DegeneratedLoopsTest", new DebugDumpScope(snippet))) { 85 StructuredGraph graph = parseEager(snippet, AllowAssumptions.YES); 86 HighTierContext context = getDefaultHighTierContext(); 87 createInliningPhase().apply(graph, context); 88 new CanonicalizerPhase().apply(graph, context); 89 debug.dump(DebugContext.BASIC_LEVEL, graph, "Graph"); 90 StructuredGraph referenceGraph = parseEager(REFERENCE_SNIPPET, AllowAssumptions.YES); 91 debug.dump(DebugContext.BASIC_LEVEL, referenceGraph, "ReferenceGraph"); 92 assertEquals(referenceGraph, graph); 93 } catch (Throwable e) { 94 throw debug.handle(e); 95 } 96 } 97 }