Mercurial > hg > truffle
view src/share/vm/prims/jvmtiManageCapabilities.hpp @ 452:00b023ae2d78
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
Summary: When we encounter marking stack overflow during precleaning of Reference lists, we were using the overflow list mechanism, which can cause problems on account of mutating the mark word of the header because of conflicts with mutator accesses and updates of that field. Instead we should use the usual mechanism for overflow handling in concurrent phases, namely dirtying of the card on which the overflowed object lies. Since precleaning effectively does a form of discovered list processing, albeit with discovery enabled, we needed to adjust some code to be correct in the face of interleaved processing and discovery.
Reviewed-by: apetrusenko, jcoomes
author | ysr |
---|---|
date | Thu, 20 Nov 2008 12:27:41 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
line wrap: on
line source
/* * Copyright 2003-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #ifndef _JAVA_JVMTI_MANAGE_CAPABILITIES_H_ #define _JAVA_JVMTI_MANAGE_CAPABILITIES_H_ class JvmtiManageCapabilities : public AllStatic { private: // these four capabilities sets represent all potentially // available capabilities. They are disjoint, covering // the four cases: (OnLoad vs OnLoad+live phase) X // (one environment vs any environment). static jvmtiCapabilities always_capabilities; static jvmtiCapabilities onload_capabilities; static jvmtiCapabilities always_solo_capabilities; static jvmtiCapabilities onload_solo_capabilities; // solo capabilities that have not been grabbed static jvmtiCapabilities always_solo_remaining_capabilities; static jvmtiCapabilities onload_solo_remaining_capabilities; // all capabilities ever acquired static jvmtiCapabilities acquired_capabilities; // basic intenal operations static jvmtiCapabilities *either(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); static jvmtiCapabilities *both(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); static jvmtiCapabilities *exclude(const jvmtiCapabilities *a, const jvmtiCapabilities *b, jvmtiCapabilities *result); static bool has_some(const jvmtiCapabilities *a); static void update(); // init functions static jvmtiCapabilities init_always_capabilities(); static jvmtiCapabilities init_onload_capabilities(); static jvmtiCapabilities init_always_solo_capabilities(); static jvmtiCapabilities init_onload_solo_capabilities(); public: static void initialize(); // may have to adjust always capabilities when VM initialization has completed static void recompute_always_capabilities(); // queries and actions static void get_potential_capabilities(const jvmtiCapabilities *current, const jvmtiCapabilities *prohibited, jvmtiCapabilities *result); static jvmtiError add_capabilities(const jvmtiCapabilities *current, const jvmtiCapabilities *prohibited, const jvmtiCapabilities *desired, jvmtiCapabilities *result); static void relinquish_capabilities(const jvmtiCapabilities *current, const jvmtiCapabilities *unwanted, jvmtiCapabilities *result); static void copy_capabilities(const jvmtiCapabilities *from, jvmtiCapabilities *to); #ifndef PRODUCT static void print(const jvmtiCapabilities* caps); #endif }; #endif /* _JAVA_JVMTI_MANAGE_CAPABILITIES_H_ */