Mercurial > hg > truffle
view test/compiler/5091921/Test6931567.java @ 11825:463f51256c86
AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry
for empty methods we emitted something like this if a inline cache is needed:
prefix:
00: < IC check >
...
0b: jne <ic_miss_call>
11: nop
...
verified_entry:
20: ret
ic_miss_call:
21: jmp <entry of runtime function>
when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a
jump to a stub that handles call-sites that has been made non-entrant. since this jump
is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that
calls this method via the unverified entry (prefix).
the fix is to emit the jump to the runtime function inside the unverfied entry:
prefix:
00: < IC check >
...
0b: je <verified_entry>
11: jeq <entry of runtime function>
16: nop
...
verified_entry:
20: ret
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 30 Sep 2013 09:32:18 +0200 |
parents | bad7ecd0b6ed |
children |
line wrap: on
line source
/* * Copyright (c) 2011, 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 6931567 * @summary JIT Error (on class file compiled with eclipse) on JVM x64 (but not on x32!). * * @run main Test6931567 */ // Should be compiled with javac from JDK1.3 to get bytecode which shows the problem. public class Test6931567 { public static void main(final String[] args) { booleanInvert(Integer.MAX_VALUE); booleanInvert(Integer.MAX_VALUE - 1); } private static void booleanInvert(final int max) { boolean test1 = false; boolean test2 = false; for (int i = 0; i < max; i++) { test1 = !test1; } for (int i = 0; i < max; i++) { test2 ^= true; } if (test1 != test2) { System.out.println("ERROR: Boolean invert\n\ttest1=" + test1 + "\n\ttest2=" + test2); System.exit(97); } else { System.out.println("Passed!"); } } }