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8258243: C2: assert failed ("Bad derived pointer") with -XX:+VerifyRegisterAllocator

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Reviewed-by: kvn, thartmann
This commit is contained in:
Christian Hagedorn 2021-01-12 08:18:45 +00:00
parent 46637047bf
commit a3561ae8a4
2 changed files with 43 additions and 3 deletions
src/hotspot/share/opto
chaitin.cpp
test/hotspot/jtreg/compiler/regalloc
TestVerifyRegisterAllocator.java

6
src/hotspot/share/opto/chaitin.cpp

@ -2406,9 +2406,9 @@ void PhaseChaitin::verify_base_ptrs(ResourceArea* a) const {
worklist.push(check->in(m));
}
} else if (check->is_Con()) {
if (is_derived) {
// Derived is NULL+offset
assert(!is_derived || check->bottom_type()->is_ptr()->ptr() == TypePtr::Null, "Bad derived pointer");
if (is_derived && check->bottom_type()->is_ptr()->_offset != 0) {
// Derived is NULL+non-zero offset, base must be NULL.
assert(check->bottom_type()->is_ptr()->ptr() == TypePtr::Null, "Bad derived pointer");
} else {
assert(check->bottom_type()->is_ptr()->_offset == 0, "Bad base pointer");
// Base either ConP(NULL) or loadConP

40
test/hotspot/jtreg/compiler/regalloc/TestVerifyRegisterAllocator.java Normal file

@ -0,0 +1,40 @@
/*
* Copyright (c) 2021, 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 8258243
* @requires vm.debug == true & vm.compiler2.enabled
* @summary Sanity check the -XX:+VerifyRegisterAllocator flag in a hello world program.
*
* @run main/othervm -Xcomp -XX:-TieredCompilation -XX:+VerifyRegisterAllocator
* compiler.regalloc.TestVerifyRegisterAllocator
*/
package compiler.regalloc;
public class TestVerifyRegisterAllocator {
public static void main(String[] strArr) {
System.out.println("Hello world!");
}
}