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revision 881 by ph10, Sun Jan 15 18:07:05 2012 UTC revision 1050 by chpe, Sun Sep 30 18:20:10 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.  Improved JIT compiler optimizations for first character search and single
8        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    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.
24    
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
27    
28    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        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    Version 8.31 06-July-2012
122    -------------------------
123    
124    1.  Fixing a wrong JIT test case and some compiler warnings.
125    
126    2.  Removed a bashism from the RunTest script.
127    
128    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
129        to unsigned type, result still unsigned" that was given by an MS compiler
130        on encountering the code "-sizeof(xxx)".
131    
132    4.  Partial matching support is added to the JIT compiler.
133    
134    5.  Fixed several bugs concerned with partial matching of items that consist
135        of more than one character:
136    
137        (a) /^(..)\1/ did not partially match "aba" because checking references was
138            done on an "all or nothing" basis. This also applied to repeated
139            references.
140    
141        (b) \R did not give a hard partial match if \r was found at the end of the
142            subject.
143    
144        (c) \X did not give a hard partial match after matching one or more
145            characters at the end of the subject.
146    
147        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
148            a partial match for the string "\r".
149    
150        (e) When newline was set to CRLF, the metacharacter "." did not recognize
151            a partial match for a CR character at the end of the subject string.
152    
153    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
154        running pcretest, the text "(JIT)" added to the output whenever JIT is
155        actually used to run the match.
156    
157    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
158        or /S+[+] with a digit between 1 and 7.
159    
160    8.  OP_NOT now supports any UTF character not just single-byte ones.
161    
162    9.  (*MARK) control verb is now supported by the JIT compiler.
163    
164    10. The command "./RunTest list" lists the available tests without actually
165        running any of them. (Because I keep forgetting what they all are.)
166    
167    11. Add PCRE_INFO_MAXLOOKBEHIND.
168    
169    12. Applied a (slightly modified) user-supplied patch that improves performance
170        when the heap is used for recursion (compiled with --disable-stack-for-
171        recursion). Instead of malloc and free for each heap frame each time a
172        logical recursion happens, frames are retained on a chain and re-used where
173        possible. This sometimes gives as much as 30% improvement.
174    
175    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
176        call.
177    
178    14. As documented, (*COMMIT) is now confined to within a positive assertion.
179    
180    15. It is now possible to link pcretest with libedit as an alternative to
181        libreadline.
182    
183    16. (*COMMIT) control verb is now supported by the JIT compiler.
184    
185    17. The Unicode data tables have been updated to Unicode 6.1.0.
186    
187    18. Added --file-list option to pcregrep.
188    
189    19. Added binary file support to pcregrep, including the -a, --binary-files,
190        -I, and --text options.
191    
192    20. The madvise function is renamed for posix_madvise for QNX compatibility
193        reasons. Fixed by Giuseppe D'Angelo.
194    
195    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
196    
197    22. Changed the option for creating symbolic links for 16-bit man pages from
198        -s to -sf so that re-installing does not cause issues.
199    
200    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
201    
202    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
203        matches in certain environments (the workspace was not being correctly
204        retained). Also added to pcre_dfa_exec() a simple plausibility check on
205        some of the workspace data at the beginning of a restart.
206    
207    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
208        was not doing so when it should - probably a typo introduced by SVN 528
209        (change 8.10/14).
210    
211    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
212        \w+ when the character tables indicated that \x{c4} was a word character.
213        There were several related cases, all because the tests for doing a table
214        lookup were testing for characters less than 127 instead of 255.
215    
216    27. If a pattern contains capturing parentheses that are not used in a match,
217        their slots in the ovector are set to -1. For those that are higher than
218        any matched groups, this happens at the end of processing. In the case when
219        there were back references that the ovector was too small to contain
220        (causing temporary malloc'd memory to be used during matching), and the
221        highest capturing number was not used, memory off the end of the ovector
222        was incorrectly being set to -1. (It was using the size of the temporary
223        memory instead of the true size.)
224    
225    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
226        ovector size, it uses memory at the end of the block that it has got.
227    
228    29. Check for an overlong MARK name and give an error at compile time. The
229        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
230    
231    30. JIT compiler update.
232    
233    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
234        Rill for the patch.
235    
236    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
237    
238    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
239    
240    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
241        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
242        was enabled.
243    
244    35. Improve JIT code generation for greedy plus quantifier.
245    
246    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
247        1 to "aa" instead of to an empty string. The bug affected repeated groups
248        that could potentially match an empty string.
249    
250    37. Optimizing single character iterators in JIT.
251    
252    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
253        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
254        codepoints that are too big for the mode are faulted, and in a UTF mode,
255        disallowed codepoints are also faulted.
256    
257    39. If PCRE was compiled with UTF support, in three places in the DFA
258        matcher there was code that should only have been obeyed in UTF mode, but
259        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
260        processing when bytes with values greater than 127 were present. In 16-bit
261        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
262        both cases the values are those that cannot be the first data item in a UTF
263        character. The three items that might have provoked this were recursions,
264        possessively repeated groups, and atomic groups.
265    
266    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
267        and pcregrep, because some OS require shared objects to be explicitly
268        passed to ld, causing the link step to fail if they are not.
269    
270    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
271        mode, patterns that started with \h* or \R* might be incorrectly matched.
272    
273    
274    Version 8.30 04-February-2012
275    -----------------------------
276    
277  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
278      name is defined in ctype.h.      name is defined in ctype.h.
279    
# Line 32  Version 8.30 Line 302  Version 8.30
302    
303  8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size  8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
304      rounding is not applied in this particular case).      rounding is not applied in this particular case).
305    
306  9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected  9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
307      if they appear, or are escaped, in patterns.      if they appear, or are escaped, in patterns.
308    
309  10. Get rid of a number of -Wunused-but-set-variable warnings.  10. Get rid of a number of -Wunused-but-set-variable warnings.
310    
311    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
312        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
313        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
314        also returns the mark "x". This bug applied to capturing parentheses,
315        non-capturing parentheses, and atomic parentheses. It also applied to some
316        assertions.
317    
318    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
319        information out of configure.ac instead of relying on pcre.h.generic, which
320        is not stored in the repository.
321    
322    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
323        -lreadline.
324    
325    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
326    
327    15. Applied Graycode's patch to put the top-level frame on the stack rather
328        than the heap when not using the stack for recursion. This gives a
329        performance improvement in many cases when recursion is not deep.
330    
331    16. Experimental code added to "pcretest -C" to output the stack frame size.
332    
333    
334  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011

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