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revision 836 by ph10, Wed Dec 28 17:16:11 2011 UTC revision 1190 by ph10, Tue Oct 30 16:49:19 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.30  Version 8.32
5  ------------  ------------
6    
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.
9    
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
12    
13    3.  Single character iterator optimizations in the JIT compiler.
14    
15    4.  Improved JIT compiler optimizations for character ranges.
16    
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
19    
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.
24    
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
27    
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:
30    
31        (a) There is now no limit to the number of patterns to be matched.
32    
33        (b) An error is given if a pattern is too long.
34    
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
37    
38        (d) --exclude-from and --include-from (multiple use) have been added.
39    
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
42    
43        (f) Multiple uses of -f and --file-list are now supported.
44    
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.
48    
49        (h) The documentation has been revised and clarified in places.
50    
51    9.  Improve the matching speed of capturing brackets.
52    
53    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
55    
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.
58    
59    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
60    
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.
64    
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
67    
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).
73    
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
76    
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
78    
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).
83    
84    19. Improving the first n character searches.
85    
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
88    
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.
92    
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.
98    
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.
103    
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.
108    
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.
112    
113        (e) Caseless back references now work with characters that have more than
114            one other case.
115    
116        (f) General caseless matching of characters with more than one other case
117            is supported.
118    
119    22. Unicode character properties were updated from Unicode 6.2.0
120    
121    23. Improved CMake support under Windows. Patch by Daniel Richard G.
122    
123    24. Add support for 32-bit character strings, and UTF-32
124    
125    25. Major JIT compiler update (code refactoring and bugfixing).
126        Experimental Sparc 32 support is added.
127    
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.
131    
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.
134    
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.
140    
141    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
142        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
143        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
144    
145    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
146        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
147        the "old" RFC 2279). Instead, it ended up passing a negative length to
148        pcre_exec().
149    
150    
151    Version 8.31 06-July-2012
152    -------------------------
153    
154    1.  Fixing a wrong JIT test case and some compiler warnings.
155    
156    2.  Removed a bashism from the RunTest script.
157    
158    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
159        to unsigned type, result still unsigned" that was given by an MS compiler
160        on encountering the code "-sizeof(xxx)".
161    
162    4.  Partial matching support is added to the JIT compiler.
163    
164    5.  Fixed several bugs concerned with partial matching of items that consist
165        of more than one character:
166    
167        (a) /^(..)\1/ did not partially match "aba" because checking references was
168            done on an "all or nothing" basis. This also applied to repeated
169            references.
170    
171        (b) \R did not give a hard partial match if \r was found at the end of the
172            subject.
173    
174        (c) \X did not give a hard partial match after matching one or more
175            characters at the end of the subject.
176    
177        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
178            a partial match for the string "\r".
179    
180        (e) When newline was set to CRLF, the metacharacter "." did not recognize
181            a partial match for a CR character at the end of the subject string.
182    
183    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
184        running pcretest, the text "(JIT)" added to the output whenever JIT is
185        actually used to run the match.
186    
187    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
188        or /S+[+] with a digit between 1 and 7.
189    
190    8.  OP_NOT now supports any UTF character not just single-byte ones.
191    
192    9.  (*MARK) control verb is now supported by the JIT compiler.
193    
194    10. The command "./RunTest list" lists the available tests without actually
195        running any of them. (Because I keep forgetting what they all are.)
196    
197    11. Add PCRE_INFO_MAXLOOKBEHIND.
198    
199    12. Applied a (slightly modified) user-supplied patch that improves performance
200        when the heap is used for recursion (compiled with --disable-stack-for-
201        recursion). Instead of malloc and free for each heap frame each time a
202        logical recursion happens, frames are retained on a chain and re-used where
203        possible. This sometimes gives as much as 30% improvement.
204    
205    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
206        call.
207    
208    14. As documented, (*COMMIT) is now confined to within a positive assertion.
209    
210    15. It is now possible to link pcretest with libedit as an alternative to
211        libreadline.
212    
213    16. (*COMMIT) control verb is now supported by the JIT compiler.
214    
215    17. The Unicode data tables have been updated to Unicode 6.1.0.
216    
217    18. Added --file-list option to pcregrep.
218    
219    19. Added binary file support to pcregrep, including the -a, --binary-files,
220        -I, and --text options.
221    
222    20. The madvise function is renamed for posix_madvise for QNX compatibility
223        reasons. Fixed by Giuseppe D'Angelo.
224    
225    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
226    
227    22. Changed the option for creating symbolic links for 16-bit man pages from
228        -s to -sf so that re-installing does not cause issues.
229    
230    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
231    
232    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
233        matches in certain environments (the workspace was not being correctly
234        retained). Also added to pcre_dfa_exec() a simple plausibility check on
235        some of the workspace data at the beginning of a restart.
236    
237    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
238        was not doing so when it should - probably a typo introduced by SVN 528
239        (change 8.10/14).
240    
241    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
242        \w+ when the character tables indicated that \x{c4} was a word character.
243        There were several related cases, all because the tests for doing a table
244        lookup were testing for characters less than 127 instead of 255.
245    
246    27. If a pattern contains capturing parentheses that are not used in a match,
247        their slots in the ovector are set to -1. For those that are higher than
248        any matched groups, this happens at the end of processing. In the case when
249        there were back references that the ovector was too small to contain
250        (causing temporary malloc'd memory to be used during matching), and the
251        highest capturing number was not used, memory off the end of the ovector
252        was incorrectly being set to -1. (It was using the size of the temporary
253        memory instead of the true size.)
254    
255    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
256        ovector size, it uses memory at the end of the block that it has got.
257    
258    29. Check for an overlong MARK name and give an error at compile time. The
259        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
260    
261    30. JIT compiler update.
262    
263    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
264        Rill for the patch.
265    
266    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
267    
268    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
269    
270    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
271        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
272        was enabled.
273    
274    35. Improve JIT code generation for greedy plus quantifier.
275    
276    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
277        1 to "aa" instead of to an empty string. The bug affected repeated groups
278        that could potentially match an empty string.
279    
280    37. Optimizing single character iterators in JIT.
281    
282    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
283        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
284        codepoints that are too big for the mode are faulted, and in a UTF mode,
285        disallowed codepoints are also faulted.
286    
287    39. If PCRE was compiled with UTF support, in three places in the DFA
288        matcher there was code that should only have been obeyed in UTF mode, but
289        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
290        processing when bytes with values greater than 127 were present. In 16-bit
291        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
292        both cases the values are those that cannot be the first data item in a UTF
293        character. The three items that might have provoked this were recursions,
294        possessively repeated groups, and atomic groups.
295    
296    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
297        and pcregrep, because some OS require shared objects to be explicitly
298        passed to ld, causing the link step to fail if they are not.
299    
300    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
301        mode, patterns that started with \h* or \R* might be incorrectly matched.
302    
303    
304    Version 8.30 04-February-2012
305    -----------------------------
306    
307    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
308        name is defined in ctype.h.
309    
310    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
311        only in quite long subpatterns.
312    
313    3.  Removed the function pcre_info(), which has been obsolete and deprecated
314        since it was replaced by pcre_fullinfo() in February 2000.
315    
316  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
317      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
318      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
319      was introduced by fix 17 of release 8.21.      was introduced by fix 17 of release 8.21.
320    
321  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
322      totally wrong answers (in non-JavaScript-compatibility mode). For example,      totally wrong answers (in non-JavaScript-compatibility mode). For example,
323      /(another)?(\1?)test/ matched against "hello world test". This bug was      /(another)?(\1?)test/ matched against "hello world test". This bug was
324      introduced in release 8.13.      introduced in release 8.13.
325    
326  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
327      many changes and refactorings).      many changes and refactorings).
328    
329    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
330        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
331        from a file.
332    
333    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
334        rounding is not applied in this particular case).
335    
336    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
337        if they appear, or are escaped, in patterns.
338    
339    10. Get rid of a number of -Wunused-but-set-variable warnings.
340    
341    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
342        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
343        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
344        also returns the mark "x". This bug applied to capturing parentheses,
345        non-capturing parentheses, and atomic parentheses. It also applied to some
346        assertions.
347    
348    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
349        information out of configure.ac instead of relying on pcre.h.generic, which
350        is not stored in the repository.
351    
352    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
353        -lreadline.
354    
355    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
356    
357    15. Applied Graycode's patch to put the top-level frame on the stack rather
358        than the heap when not using the stack for recursion. This gives a
359        performance improvement in many cases when recursion is not deep.
360    
361    16. Experimental code added to "pcretest -C" to output the stack frame size.
362    
363    
364  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011
365  ------------------------  ------------------------

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