Mercurial > hg > truffle
view src/share/vm/compiler/compileLog.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 |
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/* * Copyright 2002-2004 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. * */ class ciObject; class ciSymbol; // CompileLog // // An open stream for logging information about activities in a // compiler thread. There is exactly one per CompilerThread, // if the +LogCompilation switch is enabled. class CompileLog : public xmlStream { private: const char* _file; // name of file where XML goes julong _file_end; // last good end of file intx _thread_id; // which compile thread stringStream _context; // optional, killable context marker char _context_buffer[100]; char* _identities; // array of boolean int _identities_limit; int _identities_capacity; CompileLog* _next; // static chain of all logs static CompileLog* _first; // head of static chain void va_tag(bool push, const char* format, va_list ap); public: CompileLog(const char* file, FILE* fp, intx thread_id); ~CompileLog(); intx thread_id() { return _thread_id; } const char* file() { return _file; } stringStream* context() { return &_context; } void name(ciSymbol* s); // name='s' void name(symbolHandle s) { xmlStream::name(s); } // Output an object description, return obj->ident(). int identify(ciObject* obj); void clear_identities(); // virtuals virtual void see_tag(const char* tag, bool push); virtual void pop_tag(const char* tag); // make a provisional end of log mark void mark_file_end() { _file_end = out()->count(); } // copy all logs to the given stream static void finish_log(outputStream* out); static void finish_log_on_error(outputStream* out, char *buf, int buflen); };