Thu, 27 Jan 2011 16:11:27 -0800
6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank
1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
25 #ifndef SHARE_VM_UTILITIES_UTF8_HPP
26 #define SHARE_VM_UTILITIES_UTF8_HPP
28 #include "memory/allocation.hpp"
29 #include "utilities/top.hpp"
31 // Low-level interface for UTF8 strings
33 class UTF8 : AllStatic {
34 public:
35 // returns the unicode length of a 0-terminated uft8 string
36 static int unicode_length(const char* uft8_str);
38 // returns the unicode length of a non-0-terminated uft8 string
39 static int unicode_length(const char* uft8_str, int len);
41 // converts a uft8 string to a unicode string
42 static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length);
44 // decodes the current utf8 character, stores the result in value,
45 // and returns the end of the current uft8 chararacter.
46 static char* next(const char* str, jchar* value);
48 // decodes the current utf8 character, gets the supplementary character instead of
49 // the surrogate pair when seeing a supplementary character in string,
50 // stores the result in value, and returns the end of the current uft8 chararacter.
51 static char* next_character(const char* str, jint* value);
53 // Utility methods
54 static const jbyte* strrchr(const jbyte* base, int length, jbyte c);
55 static bool equal(const jbyte* base1, int length1, const jbyte* base2,int length2);
56 static bool is_supplementary_character(const unsigned char* str);
57 static jint get_supplementary_character(const unsigned char* str);
58 };
61 // Low-level interface for UNICODE strings
63 // A unicode string represents a string in the UTF-16 format in which supplementary
64 // characters are represented by surrogate pairs. Index values refer to char code
65 // units, so a supplementary character uses two positions in a unicode string.
67 class UNICODE : AllStatic {
68 public:
69 // returns the utf8 size of a unicode character
70 static int utf8_size(jchar c);
72 // returns the utf8 length of a unicode string
73 static int utf8_length(jchar* base, int length);
75 // converts a unicode string to utf8 string
76 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer);
78 // converts a unicode string to a utf8 string; result is allocated
79 // in resource area unless a buffer is provided.
80 static char* as_utf8(jchar* base, int length);
81 static char* as_utf8(jchar* base, int length, char* buf, int buflen);
82 };
84 #endif // SHARE_VM_UTILITIES_UTF8_HPP