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view test/compiler/6769124/TestUnalignedLoad6769124.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 | c18cbe5936b8 |
children |
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/* * Copyright (c) 2009, 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 6769124 * @summary unaligned load may fail with c1 on 64 bit */ public class TestUnalignedLoad6769124 { static long l1v = 0x200000003L; static long l2v = 0x400000005L; static double d1v = Double.MAX_VALUE; static double d2v = Double.MIN_VALUE; public static void main(String[] args) { long l1 = l1v; double d1 = d1v; long l2 = l2v; double d2 = d2v; // Run long enough to induce an OSR for (int i = 0; i < 10000000; i++) { } boolean error = false; if (l1 != l1v) { System.out.println(l1 + " != " + l1v); error = true; } if (l2 != l2v) { System.out.println(l2 + " != " + l2v); error = true; } if (d1 != d1v) { System.out.println(d1 + " != " + d1v); error = true; } if (d2 != d2v) { System.out.println(d2 + " != " + d2v); error = true; } if (error) { throw new InternalError(); } } }