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revision 836 by ph10, Wed Dec 28 17:16:11 2011 UTC revision 1033 by ph10, Mon Sep 10 11:02:48 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.30  Version 8.32
5  ------------  ------------
7  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this  1.  Improved JIT compiler optimizations for first character search and single
8      name is defined in ctype.h.      character iterators.
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
13    3.  Single character iterator optimizations in the JIT compiler.
15    4.  Improved JIT compiler optimizations for character ranges.
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
20  2.  Fixed a bug in the code for calculating the fixed length of lookbehind  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
21      assertions.      of a line, was being set incorrectly in cases where .* appeared inside
22        atomic brackets at the start of a pattern, or where there was a subsequent
23        *PRUNE or *SKIP.
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
28  3.  Removed the function pcre_info(), which has been obsolete and deprecated  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29      since it was replaced by pcre_fullinfo() in February 2000.      grep:
31        (a) There is now no limit to the number of patterns to be matched.
33        (b) An error is given if a pattern is too long.
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
38        (d) --exclude-from and --include-from (multiple use) have been added.
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
43        (f) Multiple uses of -f and --file-list are now supported.
45        (g) In a Windows environment, the default for -d has been changed from
46            "read" (the GNU grep default) to "skip", because otherwise the presence
47            of a directory in the file list provokes an error.
49        (h) The documentation has been revised and clarified in places.
51    9.  Improve the matching speed of capturing brackets.
53    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
56    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
57        out POSIX threads when JIT support is configured.
59    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
61    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
62        structure could go wrong in environments where size_t is not the same size
63        as int.
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
68    15. The EBCDIC support had decayed; later updates to the code had included
69        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
70        general tidy up of EBCDIC-related issues, and the documentation was also
71        not quite right. There is now a test that can be run on ASCII systems to
72        check some of the EBCDIC-related things (but is it not a full test).
76    Version 8.31 06-July-2012
77    -------------------------
79    1.  Fixing a wrong JIT test case and some compiler warnings.
81    2.  Removed a bashism from the RunTest script.
83    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
84        to unsigned type, result still unsigned" that was given by an MS compiler
85        on encountering the code "-sizeof(xxx)".
87    4.  Partial matching support is added to the JIT compiler.
89    5.  Fixed several bugs concerned with partial matching of items that consist
90        of more than one character:
92        (a) /^(..)\1/ did not partially match "aba" because checking references was
93            done on an "all or nothing" basis. This also applied to repeated
94            references.
96        (b) \R did not give a hard partial match if \r was found at the end of the
97            subject.
99        (c) \X did not give a hard partial match after matching one or more
100            characters at the end of the subject.
102        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
103            a partial match for the string "\r".
105        (e) When newline was set to CRLF, the metacharacter "." did not recognize
106            a partial match for a CR character at the end of the subject string.
108    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
109        running pcretest, the text "(JIT)" added to the output whenever JIT is
110        actually used to run the match.
112    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
113        or /S+[+] with a digit between 1 and 7.
115    8.  OP_NOT now supports any UTF character not just single-byte ones.
117    9.  (*MARK) control verb is now supported by the JIT compiler.
119    10. The command "./RunTest list" lists the available tests without actually
120        running any of them. (Because I keep forgetting what they all are.)
124    12. Applied a (slightly modified) user-supplied patch that improves performance
125        when the heap is used for recursion (compiled with --disable-stack-for-
126        recursion). Instead of malloc and free for each heap frame each time a
127        logical recursion happens, frames are retained on a chain and re-used where
128        possible. This sometimes gives as much as 30% improvement.
130    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
131        call.
133    14. As documented, (*COMMIT) is now confined to within a positive assertion.
135    15. It is now possible to link pcretest with libedit as an alternative to
136        libreadline.
138    16. (*COMMIT) control verb is now supported by the JIT compiler.
140    17. The Unicode data tables have been updated to Unicode 6.1.0.
142    18. Added --file-list option to pcregrep.
144    19. Added binary file support to pcregrep, including the -a, --binary-files,
145        -I, and --text options.
147    20. The madvise function is renamed for posix_madvise for QNX compatibility
148        reasons. Fixed by Giuseppe D'Angelo.
150    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
152    22. Changed the option for creating symbolic links for 16-bit man pages from
153        -s to -sf so that re-installing does not cause issues.
155    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
157    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
158        matches in certain environments (the workspace was not being correctly
159        retained). Also added to pcre_dfa_exec() a simple plausibility check on
160        some of the workspace data at the beginning of a restart.
162    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
163        was not doing so when it should - probably a typo introduced by SVN 528
164        (change 8.10/14).
166    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
167        \w+ when the character tables indicated that \x{c4} was a word character.
168        There were several related cases, all because the tests for doing a table
169        lookup were testing for characters less than 127 instead of 255.
171    27. If a pattern contains capturing parentheses that are not used in a match,
172        their slots in the ovector are set to -1. For those that are higher than
173        any matched groups, this happens at the end of processing. In the case when
174        there were back references that the ovector was too small to contain
175        (causing temporary malloc'd memory to be used during matching), and the
176        highest capturing number was not used, memory off the end of the ovector
177        was incorrectly being set to -1. (It was using the size of the temporary
178        memory instead of the true size.)
180    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
181        ovector size, it uses memory at the end of the block that it has got.
183    29. Check for an overlong MARK name and give an error at compile time. The
184        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
186    30. JIT compiler update.
188    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
189        Rill for the patch.
191    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
193    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
195    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
196        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
197        was enabled.
199    35. Improve JIT code generation for greedy plus quantifier.
201    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
202        1 to "aa" instead of to an empty string. The bug affected repeated groups
203        that could potentially match an empty string.
205    37. Optimizing single character iterators in JIT.
207    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
208        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
209        codepoints that are too big for the mode are faulted, and in a UTF mode,
210        disallowed codepoints are also faulted.
212    39. If PCRE was compiled with UTF support, in three places in the DFA
213        matcher there was code that should only have been obeyed in UTF mode, but
214        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
215        processing when bytes with values greater than 127 were present. In 16-bit
216        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
217        both cases the values are those that cannot be the first data item in a UTF
218        character. The three items that might have provoked this were recursions,
219        possessively repeated groups, and atomic groups.
221    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
222        and pcregrep, because some OS require shared objects to be explicitly
223        passed to ld, causing the link step to fail if they are not.
225    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
226        mode, patterns that started with \h* or \R* might be incorrectly matched.
229    Version 8.30 04-February-2012
230    -----------------------------
232    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
233        name is defined in ctype.h.
235    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
236        only in quite long subpatterns.
238    3.  Removed the function pcre_info(), which has been obsolete and deprecated
239        since it was replaced by pcre_fullinfo() in February 2000.
241  4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not  4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
242      match a (*MARK), and the match failed at the start of the subject, a      match a (*MARK), and the match failed at the start of the subject, a
243      reference to memory before the start of the subject could occur. This bug      reference to memory before the start of the subject could occur. This bug
244      was introduced by fix 17 of release 8.21.      was introduced by fix 17 of release 8.21.
246  5.  A reference to an unset group with zero minimum repetition was giving  5.  A reference to an unset group with zero minimum repetition was giving
247      totally wrong answers (in non-JavaScript-compatibility mode). For example,      totally wrong answers (in non-JavaScript-compatibility mode). For example,
248      /(another)?(\1?)test/ matched against "hello world test". This bug was      /(another)?(\1?)test/ matched against "hello world test". This bug was
249      introduced in release 8.13.      introduced in release 8.13.
251  6.  Add support for 16-bit character strings (a large amount of work involving  6.  Add support for 16-bit character strings (a large amount of work involving
252      many changes and refactorings).      many changes and refactorings).
254    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
255        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
256        from a file.
258    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
259        rounding is not applied in this particular case).
261    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
262        if they appear, or are escaped, in patterns.
264    10. Get rid of a number of -Wunused-but-set-variable warnings.
266    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
267        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
268        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
269        also returns the mark "x". This bug applied to capturing parentheses,
270        non-capturing parentheses, and atomic parentheses. It also applied to some
271        assertions.
273    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
274        information out of configure.ac instead of relying on pcre.h.generic, which
275        is not stored in the repository.
277    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
278        -lreadline.
280    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
282    15. Applied Graycode's patch to put the top-level frame on the stack rather
283        than the heap when not using the stack for recursion. This gives a
284        performance improvement in many cases when recursion is not deep.
286    16. Experimental code added to "pcretest -C" to output the stack frame size.
289  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011
290  ------------------------  ------------------------

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