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 }