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revision 842 by ph10, Sat Dec 31 15:19:04 2011 UTC revision 986 by zherczeg, Sat Jul 7 03:33:54 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.30  Version 8.32
5  ------------  ------------
6    
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
9    
10    
11    Version 8.31 06-July-2012
12    -------------------------
13    
14    1.  Fixing a wrong JIT test case and some compiler warnings.
15    
16    2.  Removed a bashism from the RunTest script.
17    
18    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
19        to unsigned type, result still unsigned" that was given by an MS compiler
20        on encountering the code "-sizeof(xxx)".
21    
22    4.  Partial matching support is added to the JIT compiler.
23    
24    5.  Fixed several bugs concerned with partial matching of items that consist
25        of more than one character:
26    
27        (a) /^(..)\1/ did not partially match "aba" because checking references was
28            done on an "all or nothing" basis. This also applied to repeated
29            references.
30    
31        (b) \R did not give a hard partial match if \r was found at the end of the
32            subject.
33    
34        (c) \X did not give a hard partial match after matching one or more
35            characters at the end of the subject.
36    
37        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
38            a partial match for the string "\r".
39    
40        (e) When newline was set to CRLF, the metacharacter "." did not recognize
41            a partial match for a CR character at the end of the subject string.
42    
43    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
44        running pcretest, the text "(JIT)" added to the output whenever JIT is
45        actually used to run the match.
46    
47    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
48        or /S+[+] with a digit between 1 and 7.
49    
50    8.  OP_NOT now supports any UTF character not just single-byte ones.
51    
52    9.  (*MARK) control verb is now supported by the JIT compiler.
53    
54    10. The command "./RunTest list" lists the available tests without actually
55        running any of them. (Because I keep forgetting what they all are.)
56    
57    11. Add PCRE_INFO_MAXLOOKBEHIND.
58    
59    12. Applied a (slightly modified) user-supplied patch that improves performance
60        when the heap is used for recursion (compiled with --disable-stack-for-
61        recursion). Instead of malloc and free for each heap frame each time a
62        logical recursion happens, frames are retained on a chain and re-used where
63        possible. This sometimes gives as much as 30% improvement.
64    
65    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
66        call.
67    
68    14. As documented, (*COMMIT) is now confined to within a positive assertion.
69    
70    15. It is now possible to link pcretest with libedit as an alternative to
71        libreadline.
72    
73    16. (*COMMIT) control verb is now supported by the JIT compiler.
74    
75    17. The Unicode data tables have been updated to Unicode 6.1.0.
76    
77    18. Added --file-list option to pcregrep.
78    
79    19. Added binary file support to pcregrep, including the -a, --binary-files,
80        -I, and --text options.
81    
82    20. The madvise function is renamed for posix_madvise for QNX compatibility
83        reasons. Fixed by Giuseppe D'Angelo.
84    
85    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
86    
87    22. Changed the option for creating symbolic links for 16-bit man pages from
88        -s to -sf so that re-installing does not cause issues.
89    
90    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
91    
92    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
93        matches in certain environments (the workspace was not being correctly
94        retained). Also added to pcre_dfa_exec() a simple plausibility check on
95        some of the workspace data at the beginning of a restart.
96    
97    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
98        was not doing so when it should - probably a typo introduced by SVN 528
99        (change 8.10/14).
100    
101    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
102        \w+ when the character tables indicated that \x{c4} was a word character.
103        There were several related cases, all because the tests for doing a table
104        lookup were testing for characters less than 127 instead of 255.
105    
106    27. If a pattern contains capturing parentheses that are not used in a match,
107        their slots in the ovector are set to -1. For those that are higher than
108        any matched groups, this happens at the end of processing. In the case when
109        there were back references that the ovector was too small to contain
110        (causing temporary malloc'd memory to be used during matching), and the
111        highest capturing number was not used, memory off the end of the ovector
112        was incorrectly being set to -1. (It was using the size of the temporary
113        memory instead of the true size.)
114    
115    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
116        ovector size, it uses memory at the end of the block that it has got.
117    
118    29. Check for an overlong MARK name and give an error at compile time. The
119        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
120    
121    30. JIT compiler update.
122    
123    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
124        Rill for the patch.
125    
126    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
127    
128    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
129    
130    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
131        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
132        was enabled.
133    
134    35. Improve JIT code generation for greedy plus quantifier.
135    
136    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
137        1 to "aa" instead of to an empty string. The bug affected repeated groups
138        that could potentially match an empty string.
139    
140    37. Optimizing single character iterators in JIT.
141    
142    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
143        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
144        codepoints that are too big for the mode are faulted, and in a UTF mode,
145        disallowed codepoints are also faulted.
146    
147    39. If PCRE was compiled with UTF support, in three places in the DFA
148        matcher there was code that should only have been obeyed in UTF mode, but
149        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
150        processing when bytes with values greater than 127 were present. In 16-bit
151        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
152        both cases the values are those that cannot be the first data item in a UTF
153        character. The three items that might have provoked this were recursions,
154        possessively repeated groups, and atomic groups.
155    
156    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
157        and pcregrep, because some OS require shared objects to be explicitly
158        passed to ld, causing the link step to fail if they are not.
159    
160    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
161        mode, patterns that started with \h* or \R* might be incorrectly matched.
162    
163    
164    Version 8.30 04-February-2012
165    -----------------------------
166    
167  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
168      name is defined in ctype.h.      name is defined in ctype.h.
169    
170  2.  Fixed a bug in the code for calculating the fixed length of lookbehind  2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
171      assertions.      only in quite long subpatterns.
172    
173  3.  Removed the function pcre_info(), which has been obsolete and deprecated  3.  Removed the function pcre_info(), which has been obsolete and deprecated
174      since it was replaced by pcre_fullinfo() in February 2000.      since it was replaced by pcre_fullinfo() in February 2000.
# Line 30  Version 8.30 Line 190  Version 8.30
190      command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken      command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
191      from a file.      from a file.
192    
193    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
194        rounding is not applied in this particular case).
195    
196    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
197        if they appear, or are escaped, in patterns.
198    
199    10. Get rid of a number of -Wunused-but-set-variable warnings.
200    
201    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
202        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
203        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
204        also returns the mark "x". This bug applied to capturing parentheses,
205        non-capturing parentheses, and atomic parentheses. It also applied to some
206        assertions.
207    
208    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
209        information out of configure.ac instead of relying on pcre.h.generic, which
210        is not stored in the repository.
211    
212    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
213        -lreadline.
214    
215    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
216    
217    15. Applied Graycode's patch to put the top-level frame on the stack rather
218        than the heap when not using the stack for recursion. This gives a
219        performance improvement in many cases when recursion is not deep.
220    
221    16. Experimental code added to "pcretest -C" to output the stack frame size.
222    
223    
224  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011
225  ------------------------  ------------------------

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