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revision 881 by ph10, Sun Jan 15 18:07:05 2012 UTC revision 1045 by ph10, Sun Sep 23 16:50:00 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.
91    
92        (a) The Unicode property table now has offsets into a new table of sets of
93            three or more characters that are case-equivalent. The MultiStage2.py
94            script that generates these tables (the pcre_ucd.c file) now scans
95            CaseFolding.txt instead of UnicodeData.txt for character case
96            information.
97    
98        (b) The code for adding characters or ranges of characters to a character
99            class has been abstracted into a generalized function that also handles
100            case-independence. In UTF-mode with UCP support, this uses the new data
101            to handle characters with more than one other case.
102    
103        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
104            whose other case is greater than 256 are now correctly matched
105            caselessly. Previously, the high codepoint matched the low one, but not
106            vice versa.
107    
108        (d) The processing of \h, \H, \v, and \ in character classes now makes use
109            of the new class addition function, using character lists defined as
110            macros alongside the case definitions of 20 above.
111    
112    
113    Version 8.31 06-July-2012
114    -------------------------
115    
116    1.  Fixing a wrong JIT test case and some compiler warnings.
117    
118    2.  Removed a bashism from the RunTest script.
119    
120    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
121        to unsigned type, result still unsigned" that was given by an MS compiler
122        on encountering the code "-sizeof(xxx)".
123    
124    4.  Partial matching support is added to the JIT compiler.
125    
126    5.  Fixed several bugs concerned with partial matching of items that consist
127        of more than one character:
128    
129        (a) /^(..)\1/ did not partially match "aba" because checking references was
130            done on an "all or nothing" basis. This also applied to repeated
131            references.
132    
133        (b) \R did not give a hard partial match if \r was found at the end of the
134            subject.
135    
136        (c) \X did not give a hard partial match after matching one or more
137            characters at the end of the subject.
138    
139        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
140            a partial match for the string "\r".
141    
142        (e) When newline was set to CRLF, the metacharacter "." did not recognize
143            a partial match for a CR character at the end of the subject string.
144    
145    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
146        running pcretest, the text "(JIT)" added to the output whenever JIT is
147        actually used to run the match.
148    
149    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
150        or /S+[+] with a digit between 1 and 7.
151    
152    8.  OP_NOT now supports any UTF character not just single-byte ones.
153    
154    9.  (*MARK) control verb is now supported by the JIT compiler.
155    
156    10. The command "./RunTest list" lists the available tests without actually
157        running any of them. (Because I keep forgetting what they all are.)
158    
159    11. Add PCRE_INFO_MAXLOOKBEHIND.
160    
161    12. Applied a (slightly modified) user-supplied patch that improves performance
162        when the heap is used for recursion (compiled with --disable-stack-for-
163        recursion). Instead of malloc and free for each heap frame each time a
164        logical recursion happens, frames are retained on a chain and re-used where
165        possible. This sometimes gives as much as 30% improvement.
166    
167    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
168        call.
169    
170    14. As documented, (*COMMIT) is now confined to within a positive assertion.
171    
172    15. It is now possible to link pcretest with libedit as an alternative to
173        libreadline.
174    
175    16. (*COMMIT) control verb is now supported by the JIT compiler.
176    
177    17. The Unicode data tables have been updated to Unicode 6.1.0.
178    
179    18. Added --file-list option to pcregrep.
180    
181    19. Added binary file support to pcregrep, including the -a, --binary-files,
182        -I, and --text options.
183    
184    20. The madvise function is renamed for posix_madvise for QNX compatibility
185        reasons. Fixed by Giuseppe D'Angelo.
186    
187    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
188    
189    22. Changed the option for creating symbolic links for 16-bit man pages from
190        -s to -sf so that re-installing does not cause issues.
191    
192    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
193    
194    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
195        matches in certain environments (the workspace was not being correctly
196        retained). Also added to pcre_dfa_exec() a simple plausibility check on
197        some of the workspace data at the beginning of a restart.
198    
199    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
200        was not doing so when it should - probably a typo introduced by SVN 528
201        (change 8.10/14).
202    
203    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
204        \w+ when the character tables indicated that \x{c4} was a word character.
205        There were several related cases, all because the tests for doing a table
206        lookup were testing for characters less than 127 instead of 255.
207    
208    27. If a pattern contains capturing parentheses that are not used in a match,
209        their slots in the ovector are set to -1. For those that are higher than
210        any matched groups, this happens at the end of processing. In the case when
211        there were back references that the ovector was too small to contain
212        (causing temporary malloc'd memory to be used during matching), and the
213        highest capturing number was not used, memory off the end of the ovector
214        was incorrectly being set to -1. (It was using the size of the temporary
215        memory instead of the true size.)
216    
217    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
218        ovector size, it uses memory at the end of the block that it has got.
219    
220    29. Check for an overlong MARK name and give an error at compile time. The
221        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
222    
223    30. JIT compiler update.
224    
225    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
226        Rill for the patch.
227    
228    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
229    
230    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
231    
232    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
233        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
234        was enabled.
235    
236    35. Improve JIT code generation for greedy plus quantifier.
237    
238    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
239        1 to "aa" instead of to an empty string. The bug affected repeated groups
240        that could potentially match an empty string.
241    
242    37. Optimizing single character iterators in JIT.
243    
244    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
245        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
246        codepoints that are too big for the mode are faulted, and in a UTF mode,
247        disallowed codepoints are also faulted.
248    
249    39. If PCRE was compiled with UTF support, in three places in the DFA
250        matcher there was code that should only have been obeyed in UTF mode, but
251        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
252        processing when bytes with values greater than 127 were present. In 16-bit
253        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
254        both cases the values are those that cannot be the first data item in a UTF
255        character. The three items that might have provoked this were recursions,
256        possessively repeated groups, and atomic groups.
257    
258    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
259        and pcregrep, because some OS require shared objects to be explicitly
260        passed to ld, causing the link step to fail if they are not.
261    
262    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
263        mode, patterns that started with \h* or \R* might be incorrectly matched.
264    
265    
266    Version 8.30 04-February-2012
267    -----------------------------
268    
269  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
270      name is defined in ctype.h.      name is defined in ctype.h.
271    
# Line 32  Version 8.30 Line 294  Version 8.30
294    
295  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
296      rounding is not applied in this particular case).      rounding is not applied in this particular case).
297    
298  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
299      if they appear, or are escaped, in patterns.      if they appear, or are escaped, in patterns.
300    
301  10. Get rid of a number of -Wunused-but-set-variable warnings.  10. Get rid of a number of -Wunused-but-set-variable warnings.
302    
303    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
304        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
305        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
306        also returns the mark "x". This bug applied to capturing parentheses,
307        non-capturing parentheses, and atomic parentheses. It also applied to some
308        assertions.
309    
310    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
311        information out of configure.ac instead of relying on pcre.h.generic, which
312        is not stored in the repository.
313    
314    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
315        -lreadline.
316    
317    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
318    
319    15. Applied Graycode's patch to put the top-level frame on the stack rather
320        than the heap when not using the stack for recursion. This gives a
321        performance improvement in many cases when recursion is not deep.
322    
323    16. Experimental code added to "pcretest -C" to output the stack frame size.
324    
325    
326  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011

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