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src/share/vm/utilities/utf8.hpp@c96030fff130
src/share/vm/utilities/utf8.hpp
Thu, 20 Nov 2008 16:56:09 -0800
- author
- ysr
- date
- Thu, 20 Nov 2008 16:56:09 -0800
- changeset 888
- c96030fff130
- parent 435
- a61af66fc99e
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
1 /*
2 * Copyright 1997-2003 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // Low-level interface for UTF8 strings
27 class UTF8 : AllStatic {
28 public:
29 // returns the unicode length of a 0-terminated uft8 string
30 static int unicode_length(const char* uft8_str);
32 // returns the unicode length of a non-0-terminated uft8 string
33 static int unicode_length(const char* uft8_str, int len);
35 // converts a uft8 string to a unicode string
36 static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length);
38 // decodes the current utf8 character, stores the result in value,
39 // and returns the end of the current uft8 chararacter.
40 static char* next(const char* str, jchar* value);
42 // decodes the current utf8 character, gets the supplementary character instead of
43 // the surrogate pair when seeing a supplementary character in string,
44 // stores the result in value, and returns the end of the current uft8 chararacter.
45 static char* next_character(const char* str, jint* value);
47 // Utility methods
48 static jbyte* strrchr(jbyte* base, int length, jbyte c);
49 static bool equal(jbyte* base1, int length1, jbyte* base2, int length2);
50 static bool is_supplementary_character(const unsigned char* str);
51 static jint get_supplementary_character(const unsigned char* str);
52 };
55 // Low-level interface for UNICODE strings
57 // A unicode string represents a string in the UTF-16 format in which supplementary
58 // characters are represented by surrogate pairs. Index values refer to char code
59 // units, so a supplementary character uses two positions in a unicode string.
61 class UNICODE : AllStatic {
62 public:
63 // returns the utf8 size of a unicode character
64 static int utf8_size(jchar c);
66 // returns the utf8 length of a unicode string
67 static int utf8_length(jchar* base, int length);
69 // converts a unicode string to utf8 string
70 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer);
72 // converts a unicode string to a utf8 string; result is allocated
73 // in resource area unless a buffer is provided.
74 static char* as_utf8(jchar* base, int length);
75 static char* as_utf8(jchar* base, int length, char* buf, int buflen);
76 };
