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 * 32 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement 33 * compiler.arraycopy.TestArrayCopyOverflowArguments 34 */ 35 36 package compiler.arraycopy; 37 38 public class TestArrayCopyOverflowArguments { 39 40 // Without volatile the overflowing computation was moved up and then 41 // spilled to the stack. The 32-bit spill store caused proper rounding. 42 static volatile int mod = Integer.MAX_VALUE; 43 m1(Object src)44 public static int[] m1(Object src) { 45 if (src == null) return null; 46 int[] dest = new int[10]; 47 try { 48 // PPC C calling conventions require that ints are properly expanded 49 // to longs when passed to a function. 50 int pos = 8 + mod + mod; // = 0x1_0000_0006. 51 int start = 2 + mod + mod; // = 0x1_0000_0000. 52 int len = 12 + mod + mod; // = 0x1_0000_0010. 53 // This is supposed to call SharedRuntime::slow_arraycopy_C(). 54 System.arraycopy(src, pos, dest, 0, 10); 55 } catch (ArrayStoreException npe) { 56 } 57 return dest; 58 } 59 main(String[] args)60 static public void main(String[] args) throws Exception { 61 int[] src = new int[20]; 62 63 for (int i = 0; i < 20; ++i) { 64 src[i] = i * (i-1); 65 } 66 67 for (int i = 0; i < 20000; i++) { 68 m1(src); 69 } 70 } 71 } 72 73