Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/utf8.hpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
rev | line source |
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0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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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 | |
25 // Low-level interface for UTF8 strings | |
26 | |
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); | |
31 | |
32 // returns the unicode length of a non-0-terminated uft8 string | |
33 static int unicode_length(const char* uft8_str, int len); | |
34 | |
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); | |
37 | |
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); | |
41 | |
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); | |
46 | |
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 }; | |
53 | |
54 | |
55 // Low-level interface for UNICODE strings | |
56 | |
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. | |
60 | |
61 class UNICODE : AllStatic { | |
62 public: | |
63 // returns the utf8 size of a unicode character | |
64 static int utf8_size(jchar c); | |
65 | |
66 // returns the utf8 length of a unicode string | |
67 static int utf8_length(jchar* base, int length); | |
68 | |
69 // converts a unicode string to utf8 string | |
70 static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer); | |
71 | |
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 }; |