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view test/compiler/6910605/Test.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) 2010, 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 6910605 * @summary C2: NullPointerException/ClassCaseException is thrown when C2 with DeoptimizeALot is used * * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+DeoptimizeALot -Xbatch Test * * original test: nsk/coverage/runtime/runtime007 */ import java.io.*; public class Test { public static int buf=0; public static void main( String argv[] ) { System.exit(run(argv, System.out)+95); } public static int run(String argv[],PrintStream out) { int ret=0, retx=0, bad=0; for( int i=0; (i < 100000) && (bad < 10) ; i++ ) { retx = OptoRuntime_f2i_Type(out); ret += retx; if( retx !=0 ) { out.println("i="+i); bad++; } } return ret==0 ? 0 : 2 ; } public static int OptoRuntime_f2i_Type(PrintStream out) { int c1=2, c2=3, c3=4, c4=5, c5=6; int j=0, k=0; try { int[][] iii=(int[][])(new int[c1][c2]); for( j=0; j<c1; j++ ) { for( k=0; k<c2; k++ ) { iii[j][k]=(int)((float)(j+1)/(float)(k+1)); } } } catch (Throwable e) { out.println("Unexpected exception " + e); e.printStackTrace(out); out.println("j="+j+", k="+k); return 1; } return 0; } }