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revision 913 by ph10, Sun Feb 12 17:06:59 2012 UTC revision 1187 by zherczeg, Mon Oct 29 11:30:45 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.31  Version 8.32
5  -----------------------------  ------------
7    1.  Improved JIT compiler optimizations for first character search and single
8        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    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
21        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    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        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).
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
79    18. If the --only-matching (-o) option in pcregrep is specified multiple
80        times, each one causes appropriate output. For example, -o1 -o2 outputs the
81        substrings matched by the 1st and 2nd capturing parentheses. A separating
82        string can be specified by --om-separator (default empty).
84    19. Improving the first n character searches.
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
89    21. This set of changes together give more compatible Unicode case-folding
90        behaviour for characters that have more than one other case when UCP
91        support is available.
93        (a) The Unicode property table now has offsets into a new table of sets of
94            three or more characters that are case-equivalent. The MultiStage2.py
95            script that generates these tables (the pcre_ucd.c file) now scans
96            CaseFolding.txt instead of UnicodeData.txt for character case
97            information.
99        (b) The code for adding characters or ranges of characters to a character
100            class has been abstracted into a generalized function that also handles
101            case-independence. In UTF-mode with UCP support, this uses the new data
102            to handle characters with more than one other case.
104        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
105            whose other case is greater than 256 are now correctly matched
106            caselessly. Previously, the high codepoint matched the low one, but not
107            vice versa.
109        (d) The processing of \h, \H, \v, and \ in character classes now makes use
110            of the new class addition function, using character lists defined as
111            macros alongside the case definitions of 20 above.
113        (e) Caseless back references now work with characters that have more than
114            one other case.
116        (f) General caseless matching of characters with more than one other case
117            is supported.
119    22. Unicode character properties were updated from Unicode 6.2.0
121    23. Improved CMake support under Windows. Patch by Daniel Richard G.
123    24. Add support for 32-bit character strings, and UTF-32
125    25. Major JIT compiler update (code refactoring and bugfixing).
126        Experimental Sparc 32 support is added.
128    26. Applied a modified version of Daniel Richard G's patch to create
129        pcre.h.generic and config.h.generic by "make" instead of in the
130        PrepareRelease script.
132    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
133        pcre_compile.c when checking for a zero character.
135    28. Introducing a native interface for JIT. Through this interface, the compiled
136        machine code can be directly executed. The purpose of this interface is to
137        provide fast pattern matching, so several sanity checks are not performed.
138        However, feature tests are still performed. The new interface provides
139        1.4x speedup compared to the old one.
142    Version 8.31 06-July-2012
143    -------------------------
145  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
147  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
149  3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied  3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
150      to unsigned type, result still unsigned" that was given by an MS compiler      to unsigned type, result still unsigned" that was given by an MS compiler
151      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
153    4.  Partial matching support is added to the JIT compiler.
155    5.  Fixed several bugs concerned with partial matching of items that consist
156        of more than one character:
158        (a) /^(..)\1/ did not partially match "aba" because checking references was
159            done on an "all or nothing" basis. This also applied to repeated
160            references.
162        (b) \R did not give a hard partial match if \r was found at the end of the
163            subject.
165        (c) \X did not give a hard partial match after matching one or more
166            characters at the end of the subject.
168        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
169            a partial match for the string "\r".
171        (e) When newline was set to CRLF, the metacharacter "." did not recognize
172            a partial match for a CR character at the end of the subject string.
174    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
175        running pcretest, the text "(JIT)" added to the output whenever JIT is
176        actually used to run the match.
178    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
179        or /S+[+] with a digit between 1 and 7.
181    8.  OP_NOT now supports any UTF character not just single-byte ones.
183    9.  (*MARK) control verb is now supported by the JIT compiler.
185    10. The command "./RunTest list" lists the available tests without actually
186        running any of them. (Because I keep forgetting what they all are.)
190    12. Applied a (slightly modified) user-supplied patch that improves performance
191        when the heap is used for recursion (compiled with --disable-stack-for-
192        recursion). Instead of malloc and free for each heap frame each time a
193        logical recursion happens, frames are retained on a chain and re-used where
194        possible. This sometimes gives as much as 30% improvement.
196    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
197        call.
199    14. As documented, (*COMMIT) is now confined to within a positive assertion.
201    15. It is now possible to link pcretest with libedit as an alternative to
202        libreadline.
204    16. (*COMMIT) control verb is now supported by the JIT compiler.
206    17. The Unicode data tables have been updated to Unicode 6.1.0.
208    18. Added --file-list option to pcregrep.
210    19. Added binary file support to pcregrep, including the -a, --binary-files,
211        -I, and --text options.
213    20. The madvise function is renamed for posix_madvise for QNX compatibility
214        reasons. Fixed by Giuseppe D'Angelo.
216    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
218    22. Changed the option for creating symbolic links for 16-bit man pages from
219        -s to -sf so that re-installing does not cause issues.
221    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
223    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
224        matches in certain environments (the workspace was not being correctly
225        retained). Also added to pcre_dfa_exec() a simple plausibility check on
226        some of the workspace data at the beginning of a restart.
228    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
229        was not doing so when it should - probably a typo introduced by SVN 528
230        (change 8.10/14).
232    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
233        \w+ when the character tables indicated that \x{c4} was a word character.
234        There were several related cases, all because the tests for doing a table
235        lookup were testing for characters less than 127 instead of 255.
237    27. If a pattern contains capturing parentheses that are not used in a match,
238        their slots in the ovector are set to -1. For those that are higher than
239        any matched groups, this happens at the end of processing. In the case when
240        there were back references that the ovector was too small to contain
241        (causing temporary malloc'd memory to be used during matching), and the
242        highest capturing number was not used, memory off the end of the ovector
243        was incorrectly being set to -1. (It was using the size of the temporary
244        memory instead of the true size.)
246    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
247        ovector size, it uses memory at the end of the block that it has got.
249    29. Check for an overlong MARK name and give an error at compile time. The
250        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
252    30. JIT compiler update.
254    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
255        Rill for the patch.
257    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
259    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
261    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
262        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
263        was enabled.
265    35. Improve JIT code generation for greedy plus quantifier.
267    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
268        1 to "aa" instead of to an empty string. The bug affected repeated groups
269        that could potentially match an empty string.
271    37. Optimizing single character iterators in JIT.
273    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
274        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
275        codepoints that are too big for the mode are faulted, and in a UTF mode,
276        disallowed codepoints are also faulted.
278    39. If PCRE was compiled with UTF support, in three places in the DFA
279        matcher there was code that should only have been obeyed in UTF mode, but
280        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
281        processing when bytes with values greater than 127 were present. In 16-bit
282        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
283        both cases the values are those that cannot be the first data item in a UTF
284        character. The three items that might have provoked this were recursions,
285        possessively repeated groups, and atomic groups.
287    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
288        and pcregrep, because some OS require shared objects to be explicitly
289        passed to ld, causing the link step to fail if they are not.
291    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
292        mode, patterns that started with \h* or \R* might be incorrectly matched.
295  Version 8.30 04-February-2012  Version 8.30 04-February-2012
296  -----------------------------  -----------------------------

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