1 /* 2 * Copyright (c) 2019, 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.printer.CanonicalStringGraphPrinter; 28 import org.junit.Test; 29 30 import jdk.vm.ci.meta.JavaConstant; 31 32 /** 33 * Tests related to graph printing. 34 */ 35 public class GraphPrinterTest extends GraalCompilerTest { 36 37 /** 38 * Tests that a self-recursive object does not cause stack overflow when formatted as a string. 39 */ 40 @Test 41 public void testGraphPrinterDoesNotStackOverflow() { 42 CanonicalStringGraphPrinter printer = new CanonicalStringGraphPrinter(getSnippetReflection()); 43 Object[] topArray = {null}; 44 Object[] parent = topArray; 45 Object[] lastArray = null; 46 for (int i = 0; i < 5; i++) { 47 lastArray = new Object[1]; 48 parent[0] = lastArray; 49 parent = lastArray; 50 } 51 lastArray[0] = topArray; 52 JavaConstant constant = getSnippetReflection().forObject(topArray); 53 printer.format(constant); 54 } 55 }