Mercurial > hg > truffle
annotate src/share/vm/utilities/utf8.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
author | tschatzl |
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date | Fri, 10 Oct 2014 15:51:58 +0200 |
parents | 8c03fc47511d |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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: | |
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35 // returns the unicode length of a 0-terminated utf8 string |
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36 static int unicode_length(const char* utf8_str); |
0 | 37 |
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38 // returns the unicode length of a non-0-terminated utf8 string |
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39 static int unicode_length(const char* utf8_str, int len); |
0 | 40 |
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41 // converts a utf8 string to a unicode string |
0 | 42 static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length); |
43 | |
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44 // returns the quoted ascii length of a utf8 string |
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45 static int quoted_ascii_length(const char* utf8_str, int utf8_length); |
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46 |
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47 // converts a utf8 string to quoted ascii |
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48 static void as_quoted_ascii(const char* utf8_str, int utf8_length, char* buf, int buflen); |
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49 |
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50 // converts a quoted ascii string to utf8 string. returns the original |
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51 // string unchanged if nothing needs to be done. |
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52 static const char* from_quoted_ascii(const char* quoted_ascii_string); |
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53 |
0 | 54 // decodes the current utf8 character, stores the result in value, |
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55 // and returns the end of the current utf8 chararacter. |
0 | 56 static char* next(const char* str, jchar* value); |
57 | |
58 // decodes the current utf8 character, gets the supplementary character instead of | |
59 // the surrogate pair when seeing a supplementary character in string, | |
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60 // stores the result in value, and returns the end of the current utf8 chararacter. |
0 | 61 static char* next_character(const char* str, jint* value); |
62 | |
63 // Utility methods | |
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64 static const jbyte* strrchr(const jbyte* base, int length, jbyte c); |
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65 static bool equal(const jbyte* base1, int length1, const jbyte* base2,int length2); |
0 | 66 static bool is_supplementary_character(const unsigned char* str); |
67 static jint get_supplementary_character(const unsigned char* str); | |
68 }; | |
69 | |
70 | |
71 // Low-level interface for UNICODE strings | |
72 | |
73 // A unicode string represents a string in the UTF-16 format in which supplementary | |
74 // characters are represented by surrogate pairs. Index values refer to char code | |
75 // units, so a supplementary character uses two positions in a unicode string. | |
76 | |
77 class UNICODE : AllStatic { | |
78 public: | |
79 // returns the utf8 size of a unicode character | |
80 static int utf8_size(jchar c); | |
81 | |
82 // returns the utf8 length of a unicode string | |
83 static int utf8_length(jchar* base, int length); | |
84 | |
85 // converts a unicode string to utf8 string | |
86 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer); | |
87 | |
88 // converts a unicode string to a utf8 string; result is allocated | |
89 // in resource area unless a buffer is provided. | |
90 static char* as_utf8(jchar* base, int length); | |
91 static char* as_utf8(jchar* base, int length, char* buf, int buflen); | |
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92 |
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93 // returns the quoted ascii length of a unicode string |
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94 static int quoted_ascii_length(jchar* base, int length); |
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95 |
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96 // converts a utf8 string to quoted ascii |
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97 static void as_quoted_ascii(const jchar* base, int length, char* buf, int buflen); |
0 | 98 }; |
1972 | 99 |
100 #endif // SHARE_VM_UTILITIES_UTF8_HPP |