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view test/gc/g1/TestPrintRegionRememberedSetInfo.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 | 05a17f270c7e |
children | e3c8767c5cf8 |
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/* * Copyright (c) 2013, 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 TestPrintRegionRememberedSetInfo * @key gc * @bug 8014240 * @summary Test output of G1PrintRegionRememberedSetInfo * @library /testlibrary * @build TestPrintRegionRememberedSetInfo * @author thomas.schatzl@oracle.com */ import com.oracle.java.testlibrary.*; import java.lang.Thread; import java.util.ArrayList; import java.util.Arrays; class RunAndWaitForMarking { public static void main(String[] args) { System.gc(); try { Thread.sleep(200); } catch (InterruptedException e) { } } } public class TestPrintRegionRememberedSetInfo { public static String runTest(String arg) throws Exception { ArrayList<String> finalargs = new ArrayList<String>(); String[] defaultArgs = new String[] { "-XX:+UseG1GC", "-Xmx10m", "-XX:+ExplicitGCInvokesConcurrent", "-XX:+UnlockDiagnosticVMOptions", "-XX:+G1PrintRegionLivenessInfo", "-XX:G1HeapRegionSize=1M", "-XX:InitiatingHeapOccupancyPercent=0", }; finalargs.addAll(Arrays.asList(defaultArgs)); finalargs.add(arg); finalargs.add(RunAndWaitForMarking.class.getName()); ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( finalargs.toArray(new String[0])); OutputAnalyzer output = new OutputAnalyzer(pb.start()); output.shouldHaveExitValue(0); String result = output.getStdout(); return result; } public static void main(String[] args) throws Exception { String result; result = runTest("-XX:+G1PrintRegionLivenessInfo"); // check that we got region statistics output if (result.indexOf("PHASE") == -1) { throw new RuntimeException("Unexpected output from -XX:+PrintRegionLivenessInfo found."); } result = runTest("-XX:-G1PrintRegionLivenessInfo"); if (result.indexOf("remset") != -1) { throw new RuntimeException("Should find remembered set information in output."); } } }