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revision 787 by ph10, Tue Dec 6 15:37:24 2011 UTC revision 979 by ph10, Sun Jun 17 19:08:41 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21 05-Dec-2011  Version 8.31 02-June-2012
5    -------------------------
7    1.  Fixing a wrong JIT test case and some compiler warnings.
9    2.  Removed a bashism from the RunTest script.
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
15    4.  Partial matching support is added to the JIT compiler.
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
45    9.  (*MARK) control verb is now supported by the JIT compiler.
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
70    18. Added --file-list option to pcregrep.
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
80    22. Changed the option for creating symbolic links for 16-bit man pages from
81        -s to -sf so that re-installing does not cause issues.
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
85    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
86        matches in certain environments (the workspace was not being correctly
87        retained). Also added to pcre_dfa_exec() a simple plausibility check on
88        some of the workspace data at the beginning of a restart.
90    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
91        was not doing so when it should - probably a typo introduced by SVN 528
92        (change 8.10/14).
94    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
95        \w+ when the character tables indicated that \x{c4} was a word character.
96        There were several related cases, all because the tests for doing a table
97        lookup were testing for characters less than 127 instead of 255.
99    27. If a pattern contains capturing parentheses that are not used in a match,
100        their slots in the ovector are set to -1. For those that are higher than
101        any matched groups, this happens at the end of processing. In the case when
102        there were back references that the ovector was too small to contain
103        (causing temporary malloc'd memory to be used during matching), and the
104        highest capturing number was not used, memory off the end of the ovector
105        was incorrectly being set to -1. (It was using the size of the temporary
106        memory instead of the true size.)
108    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
109        ovector size, it uses memory at the end of the block that it has got.
111    29. Check for an overlong MARK name and give an error at compile time. The
112        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
114    30. JIT compiler update.
116    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
117        Rill for the patch.
119    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
121    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
123    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
124        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
125        was enabled.
127    35. Improve JIT code generation for greedy plus quantifier.
129    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
130        1 to "aa" instead of to an empty string. The bug affected repeated groups
131        that could potentially match an empty string.
133    37. Optimizing single character iterators in JIT.
135    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
136        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
137        codepoints that are too big for the mode are faulted, and in a UTF mode,
138        disallowed codepoints are also faulted.
140    39. If PCRE was compiled with UTF support, in three places in the DFA
141        matcher there was code that should only have been obeyed in UTF mode, but
142        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
143        processing when bytes with values greater than 127 were present. In 16-bit
144        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
145        both cases the values are those that cannot be the first data item in a UTF
146        character. The three items that might have provoked this were recursions,
147        possessively repeated groups, and atomic groups.
150    Version 8.30 04-February-2012
151    -----------------------------
153    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
154        name is defined in ctype.h.
156    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
157        only in quite long subpatterns.
159    3.  Removed the function pcre_info(), which has been obsolete and deprecated
160        since it was replaced by pcre_fullinfo() in February 2000.
162    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
163        match a (*MARK), and the match failed at the start of the subject, a
164        reference to memory before the start of the subject could occur. This bug
165        was introduced by fix 17 of release 8.21.
167    5.  A reference to an unset group with zero minimum repetition was giving
168        totally wrong answers (in non-JavaScript-compatibility mode). For example,
169        /(another)?(\1?)test/ matched against "hello world test". This bug was
170        introduced in release 8.13.
172    6.  Add support for 16-bit character strings (a large amount of work involving
173        many changes and refactorings).
175    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
176        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
177        from a file.
179    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
180        rounding is not applied in this particular case).
182    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
183        if they appear, or are escaped, in patterns.
185    10. Get rid of a number of -Wunused-but-set-variable warnings.
187    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
188        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
189        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
190        also returns the mark "x". This bug applied to capturing parentheses,
191        non-capturing parentheses, and atomic parentheses. It also applied to some
192        assertions.
194    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
195        information out of configure.ac instead of relying on pcre.h.generic, which
196        is not stored in the repository.
198    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
199        -lreadline.
201    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
203    15. Applied Graycode's patch to put the top-level frame on the stack rather
204        than the heap when not using the stack for recursion. This gives a
205        performance improvement in many cases when recursion is not deep.
207    16. Experimental code added to "pcretest -C" to output the stack frame size.
210    Version 8.21 12-Dec-2011
211  ------------------------  ------------------------
213  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 103  Version 8.21 05-Dec-2011 Line 309  Version 8.21 05-Dec-2011
309  25. The CheckMan script was not being included in the distribution. Also, added  25. The CheckMan script was not being included in the distribution. Also, added
310      an explicit "perl" to run Perl scripts from the PrepareRelease script      an explicit "perl" to run Perl scripts from the PrepareRelease script
311      because this is reportedly needed in Windows.      because this is reportedly needed in Windows.
313  26. If study data was being save in a file and studying had not found a set of  26. If study data was being save in a file and studying had not found a set of
314      "starts with" bytes for the pattern, the data written to the file (though      "starts with" bytes for the pattern, the data written to the file (though
315      never used) was taken from uninitialized memory and so caused valgrind to      never used) was taken from uninitialized memory and so caused valgrind to
316      complain.      complain.
318    27. Updated RunTest.bat as provided by Sheri Pierce.
320    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
322    29. Computation of memory usage for the table of capturing group names was
323        giving an unnecessarily large value.
326  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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