104 lines
3.7 KiB
Java
104 lines
3.7 KiB
Java
/*
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* Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8248791
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* @summary Test cloning with more than 8 (=ArrayCopyLoadStoreMaxElem) where loads are wrongly replaced by zero.
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* @requires vm.compiler2.enabled | vm.graal.enabled
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*
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* @run main/othervm -XX:-ReduceBulkZeroing
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* -XX:CompileCommand=dontinline,compiler.arraycopy.TestCloneAccess::*
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* compiler.arraycopy.TestCloneAccess
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* @run main/othervm -XX:-ReduceBulkZeroing -XX:-ReduceInitialCardMarks
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* -XX:CompileCommand=dontinline,compiler.arraycopy.TestCloneAccess::*
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* compiler.arraycopy.TestCloneAccess
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*/
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package compiler.arraycopy;
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public class TestCloneAccess {
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static int test(E src) throws CloneNotSupportedException {
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// ArrayCopyNode for this clone is not inlined since there are more than 8 (=ArrayCopyLoadStoreMaxElem) fields
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src.i1 = 3;
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E dest = (E)src.clone();
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dontInline(dest.i1, dest.i2);
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// Both loads are wrongly optimized and replaced by a constant zero. LoadNode::Value() tries to find out if a load
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// is done from a freshly-allocated object. If that is the case, the load can be replaced by the default value zero.
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// However, in this case, the Allocation node belongs to an ArrayCopyNode which is responsible for initializing 'dest'.
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// If -XX:-ReduceBulkZeroing is set, the InitializationNode of the allocation does not bail out of this optimization
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// which results in a replacement of both loads by zero. This is addressed by this fix. If -XX:+ReduceBulkZeroing is
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// set, then we already bail out and perform the load correctly.
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return dest.i1 + dest.i2;
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}
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public static void main(String[] args) throws Exception {
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E e = new E();
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e.i2 = 4;
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int res = 0;
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for (int i = 0; i < 20000; i++) {
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res = test(e);
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if (res != 7 || e.i1 != 3 || e.i2 != 4) {
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throw new RuntimeException("Wrong result! Expected: res = 7, e.i1 = 3, e.i2 = 4 "
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+ "but got: res = " + res + ", e.i1 = " + e.i1 + ", e.i2 = " + e.i2);
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}
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}
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}
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// Dont inline this method
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public static void dontInline(int i1, int i2) {
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}
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}
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class E implements Cloneable {
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/*
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* Need more than 8 (=ArrayCopyLoadStoreMaxElem) fields
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*/
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int i1;
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int i2;
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int i3;
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int i4;
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int i5;
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int i6;
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int i7;
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int i8;
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int i9;
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E() {
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i1 = 0;
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i2 = 1;
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i3 = 2;
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i4 = 3;
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i5 = 4;
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i6 = 5;
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i7 = 6;
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i8 = 7;
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i9 = 8;
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}
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public Object clone() throws CloneNotSupportedException {
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return super.clone();
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}
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}
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