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view test/compiler/7068051/Test7068051.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 | fdcb1e828d53 |
children |
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/* * 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 7068051 * @summary SIGSEGV in PhaseIdealLoop::build_loop_late_post on T5440 * * @run shell/timeout=300 Test7068051.sh */ import java.io.*; import java.nio.*; import java.util.*; import java.util.zip.*; public class Test7068051 { public static void main (String[] args) throws Throwable { ZipFile zf = new ZipFile(args[0]); Enumeration<? extends ZipEntry> entries = zf.entries(); ArrayList<String> names = new ArrayList<String>(); while (entries.hasMoreElements()) { names.add(entries.nextElement().getName()); } byte[] bytes = new byte[16]; for (String name : names) { ZipEntry e = zf.getEntry(name); if (e.isDirectory()) continue; final InputStream is = zf.getInputStream(e); try { while (is.read(bytes) >= 0) { } is.close(); } catch (IOException x) { System.out.println(".................................."); System.out.println(" --> is :" + is); System.out.println(" is.hash :" + is.hashCode()); System.out.println(); System.out.println(" e.name :" + e.getName()); System.out.println(" e.hash :" + e.hashCode()); System.out.println(" e.method :" + e.getMethod()); System.out.println(" e.size :" + e.getSize()); System.out.println(" e.csize :" + e.getCompressedSize()); x.printStackTrace(); System.out.println(".................................."); System.exit(97); } } zf.close(); } }