Mercurial > hg > truffle
annotate src/share/vm/utilities/utf8.hpp @ 1994:6cd6d394f280
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
7002546: regression on SpecJbb2005 on 7b118 comparing to 7b117 on small heaps
Summary: Relaxed assertion checking related to incremental_collection_failed flag to allow for ExplicitGCInvokesConcurrent behaviour where we do not want a failing scavenge to bail to a stop-world collection. Parameterized incremental_collection_will_fail() so we can selectively use, or not use, as appropriate, the statistical prediction at specific use sites. This essentially reverts the scavenge bail-out logic to what it was prior to some recent changes that had inadvertently started using the statistical prediction which can be noisy in the presence of bursty loads. Added some associated verbose non-product debugging messages.
Reviewed-by: johnc, tonyp
author | ysr |
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date | Tue, 07 Dec 2010 21:55:53 -0800 |
parents | f95d63e2154a |
children | 3582bf76420e |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_UTF8_HPP |
26 #define SHARE_VM_UTILITIES_UTF8_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "utilities/top.hpp" | |
30 | |
0 | 31 // Low-level interface for UTF8 strings |
32 | |
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); | |
37 | |
38 // returns the unicode length of a non-0-terminated uft8 string | |
39 static int unicode_length(const char* uft8_str, int len); | |
40 | |
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); | |
43 | |
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); | |
47 | |
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); | |
52 | |
53 // Utility methods | |
54 static jbyte* strrchr(jbyte* base, int length, jbyte c); | |
55 static bool equal(jbyte* base1, int length1, 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 }; | |
59 | |
60 | |
61 // Low-level interface for UNICODE strings | |
62 | |
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. | |
66 | |
67 class UNICODE : AllStatic { | |
68 public: | |
69 // returns the utf8 size of a unicode character | |
70 static int utf8_size(jchar c); | |
71 | |
72 // returns the utf8 length of a unicode string | |
73 static int utf8_length(jchar* base, int length); | |
74 | |
75 // converts a unicode string to utf8 string | |
76 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer); | |
77 | |
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 }; | |
1972 | 83 |
84 #endif // SHARE_VM_UTILITIES_UTF8_HPP |