Mercurial > hg > graal-jvmci-8
view src/share/vm/utilities/utf8.hpp @ 1837:c99c53f07c14
6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field.
Reviewed-by: jmasa, johnc, poonam
author | ysr |
---|---|
date | Wed, 29 Sep 2010 16:17:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 1997, 2003, 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. * */ // Low-level interface for UTF8 strings class UTF8 : AllStatic { public: // returns the unicode length of a 0-terminated uft8 string static int unicode_length(const char* uft8_str); // returns the unicode length of a non-0-terminated uft8 string static int unicode_length(const char* uft8_str, int len); // converts a uft8 string to a unicode string static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length); // decodes the current utf8 character, stores the result in value, // and returns the end of the current uft8 chararacter. static char* next(const char* str, jchar* value); // decodes the current utf8 character, gets the supplementary character instead of // the surrogate pair when seeing a supplementary character in string, // stores the result in value, and returns the end of the current uft8 chararacter. static char* next_character(const char* str, jint* value); // Utility methods static jbyte* strrchr(jbyte* base, int length, jbyte c); static bool equal(jbyte* base1, int length1, jbyte* base2, int length2); static bool is_supplementary_character(const unsigned char* str); static jint get_supplementary_character(const unsigned char* str); }; // Low-level interface for UNICODE strings // A unicode string represents a string in the UTF-16 format in which supplementary // characters are represented by surrogate pairs. Index values refer to char code // units, so a supplementary character uses two positions in a unicode string. class UNICODE : AllStatic { public: // returns the utf8 size of a unicode character static int utf8_size(jchar c); // returns the utf8 length of a unicode string static int utf8_length(jchar* base, int length); // converts a unicode string to utf8 string static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer); // converts a unicode string to a utf8 string; result is allocated // in resource area unless a buffer is provided. static char* as_utf8(jchar* base, int length); static char* as_utf8(jchar* base, int length, char* buf, int buflen); };