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view test/compiler/8002069/Test8002069.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 | f3da5ff1514c |
children |
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/* * Copyright (c) 2012, 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 8002069 * @summary Assert failed in C2: assert(field->edge_count() > 0) failed: sanity * * @run main/othervm -Xmx32m -XX:+IgnoreUnrecognizedVMOptions -Xbatch -XX:CompileCommand=exclude,Test8002069.dummy Test8002069 */ abstract class O { int f; public O() { f = 5; } abstract void put(int i); public int foo(int i) { put(i); return i; } }; class A extends O { int[] a; public A(int s) { a = new int[s]; } public void put(int i) { a[i%a.length] = i; } } class B extends O { int sz; int[] a; public B(int s) { sz = s; a = new int[s]; } public void put(int i) { a[i%sz] = i; } } public class Test8002069 { public static void main(String args[]) { int sum = 0; for (int i=0; i<8000; i++) { sum += test1(i); } for (int i=0; i<100000; i++) { sum += test2(i); } System.out.println("PASSED. sum = " + sum); } private O o; private int foo(int i) { return o.foo(i); } static int test1(int i) { Test8002069 t = new Test8002069(); t.o = new A(5); return t.foo(i); } static int test2(int i) { Test8002069 t = new Test8002069(); t.o = new B(5); dummy(i); return t.foo(i); } static int dummy(int i) { return i*2; } }