1 /* 2 * Copyright (c) 2015 SAP SE. 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 * @test 26 * @summary Test that overflowed integers passed to arraycopy don't do any harm. This might 27 * be the case on platforms where C-code expects that ints passed to a call 28 * are properly sign extended to 64 bit (e.g., PPC64, s390x). This can fail 29 * if slow_arraycopy_C() is commpiled by the C compiler without any imlicit 30 * casts (as spill stores to the stack that are done with 4-byte instruction). 31 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestArrayCopyOverflowArguments 32 * 33 */ 34 35 public class TestArrayCopyOverflowArguments { 36 37 // Without volatile the overflowing computation was moved up and then 38 // spilled to the stack. The 32-bit spill store caused proper rounding. 39 static volatile int mod = Integer.MAX_VALUE; 40 41 public static int[] m1(Object src) { 42 if (src == null) return null; 43 int[] dest = new int[10]; 44 try { 45 // PPC C calling conventions require that ints are properly expanded 46 // to longs when passed to a function. 47 int pos = 8 + mod + mod; // = 0x1_0000_0006. 48 int start = 2 + mod + mod; // = 0x1_0000_0000. 49 int len = 12 + mod + mod; // = 0x1_0000_0010. 50 // This is supposed to call SharedRuntime::slow_arraycopy_C(). 51 System.arraycopy(src, pos, dest, 0, 10); 52 } catch (ArrayStoreException npe) { 53 } 54 return dest; 55 } 56 57 static public void main(String[] args) throws Exception { 58 int[] src = new int[20]; 59 60 for (int i = 0; i < 20; ++i) { 61 src[i] = i * (i-1); 62 } 63 64 for (int i = 0; i < 20000; i++) { 65 m1(src); 66 } 67 } 68 } 69