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/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8237894
* @summary CTW: C1 compilation fails with assert(x->type()->tag() == f->type()->tag()) failed: should have same type
*
* @run main/othervm
* -Xcomp -Xbatch -XX:CompileCommand=compileonly,compiler.c1.T*::*
* -XX:CompileCommand=exclude,compiler.c1.TestValueNumberingNullObject::main
* -XX:CompileCommand=inline,*.*
* -XX:TieredStopAtLevel=3
* compiler.c1.TestValueNumberingNullObject
*/
package compiler.c1;
class T1 {
public T2 f1;
public int za() {
return 0;
}
public int zb() {
return 0;
}
public int zc() {
return 0;
}
public int zd() {
return 0;
}
public int ze() {
return 0;
}
public int zf() {
return 0;
}
public int zg() {
return 0;
}
public int zh() {
return 0;
}
}
class T2 {
public T1 f1;
public int zh() {
return 0;
}
}
public class TestValueNumberingNullObject {
public static void main(String args[]) {
new T1(); // Load
new T2(); // Load
try {
// case 1
// Null based field access.
// Value Numbering null based field access causes instructions to be eliminated across type/subtypes.
// declared type of these instructions are field type, so it being receiver causes problems to Type System.
// to mitigate this issue, we hash declared type in addition to existing hashing.
testFieldAccess();
} catch (Exception e) {
}
try {
// case 2
// Null based indexed access.
// Value Numbering null based indexed access causes instructions to be eliminated across type/subtypes.
// element basic type in encoded in the access instruction, this causes problems to Type system.
// declared type of these instructions are null, so it being receiver doesn't cause any problem to Type System.
// to mitigate this issue, we hash basic type in addition to existing hashing
basicTypeAccess();
} catch (Exception e) {
}
}
static long testFieldAccess() {
T1 t1 = null;
T2 t2 = null;
T1[] t3 = null;
T2[] t4 = null;
long value = t1.f1.zh() + t2.f1.zh();
// null array object based field access.
value += t3[2].f1.zh() + t4[2].f1.zh();
return value;
}
static long basicTypeAccess() {
long[] f1 = null;
int[] f2 = null;
T2[] t2 = null;
T1[] t1 = null;
return f1[5] + f2[5] + t2[5].zh() + t1[5].zh();
}
}
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