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revision 787 by ph10, Tue Dec 6 15:37:24 2011 UTC revision 1040 by zherczeg, Sun Sep 16 06:52:27 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21 05-Dec-2011  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    
87    Version 8.31 06-July-2012
88    -------------------------
89    
90    1.  Fixing a wrong JIT test case and some compiler warnings.
91    
92    2.  Removed a bashism from the RunTest script.
93    
94    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
95        to unsigned type, result still unsigned" that was given by an MS compiler
96        on encountering the code "-sizeof(xxx)".
97    
98    4.  Partial matching support is added to the JIT compiler.
99    
100    5.  Fixed several bugs concerned with partial matching of items that consist
101        of more than one character:
102    
103        (a) /^(..)\1/ did not partially match "aba" because checking references was
104            done on an "all or nothing" basis. This also applied to repeated
105            references.
106    
107        (b) \R did not give a hard partial match if \r was found at the end of the
108            subject.
109    
110        (c) \X did not give a hard partial match after matching one or more
111            characters at the end of the subject.
112    
113        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
114            a partial match for the string "\r".
115    
116        (e) When newline was set to CRLF, the metacharacter "." did not recognize
117            a partial match for a CR character at the end of the subject string.
118    
119    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
120        running pcretest, the text "(JIT)" added to the output whenever JIT is
121        actually used to run the match.
122    
123    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
124        or /S+[+] with a digit between 1 and 7.
125    
126    8.  OP_NOT now supports any UTF character not just single-byte ones.
127    
128    9.  (*MARK) control verb is now supported by the JIT compiler.
129    
130    10. The command "./RunTest list" lists the available tests without actually
131        running any of them. (Because I keep forgetting what they all are.)
132    
133    11. Add PCRE_INFO_MAXLOOKBEHIND.
134    
135    12. Applied a (slightly modified) user-supplied patch that improves performance
136        when the heap is used for recursion (compiled with --disable-stack-for-
137        recursion). Instead of malloc and free for each heap frame each time a
138        logical recursion happens, frames are retained on a chain and re-used where
139        possible. This sometimes gives as much as 30% improvement.
140    
141    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
142        call.
143    
144    14. As documented, (*COMMIT) is now confined to within a positive assertion.
145    
146    15. It is now possible to link pcretest with libedit as an alternative to
147        libreadline.
148    
149    16. (*COMMIT) control verb is now supported by the JIT compiler.
150    
151    17. The Unicode data tables have been updated to Unicode 6.1.0.
152    
153    18. Added --file-list option to pcregrep.
154    
155    19. Added binary file support to pcregrep, including the -a, --binary-files,
156        -I, and --text options.
157    
158    20. The madvise function is renamed for posix_madvise for QNX compatibility
159        reasons. Fixed by Giuseppe D'Angelo.
160    
161    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
162    
163    22. Changed the option for creating symbolic links for 16-bit man pages from
164        -s to -sf so that re-installing does not cause issues.
165    
166    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
167    
168    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
169        matches in certain environments (the workspace was not being correctly
170        retained). Also added to pcre_dfa_exec() a simple plausibility check on
171        some of the workspace data at the beginning of a restart.
172    
173    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
174        was not doing so when it should - probably a typo introduced by SVN 528
175        (change 8.10/14).
176    
177    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
178        \w+ when the character tables indicated that \x{c4} was a word character.
179        There were several related cases, all because the tests for doing a table
180        lookup were testing for characters less than 127 instead of 255.
181    
182    27. If a pattern contains capturing parentheses that are not used in a match,
183        their slots in the ovector are set to -1. For those that are higher than
184        any matched groups, this happens at the end of processing. In the case when
185        there were back references that the ovector was too small to contain
186        (causing temporary malloc'd memory to be used during matching), and the
187        highest capturing number was not used, memory off the end of the ovector
188        was incorrectly being set to -1. (It was using the size of the temporary
189        memory instead of the true size.)
190    
191    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
192        ovector size, it uses memory at the end of the block that it has got.
193    
194    29. Check for an overlong MARK name and give an error at compile time. The
195        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
196    
197    30. JIT compiler update.
198    
199    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
200        Rill for the patch.
201    
202    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
203    
204    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
205    
206    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
207        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
208        was enabled.
209    
210    35. Improve JIT code generation for greedy plus quantifier.
211    
212    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
213        1 to "aa" instead of to an empty string. The bug affected repeated groups
214        that could potentially match an empty string.
215    
216    37. Optimizing single character iterators in JIT.
217    
218    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
219        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
220        codepoints that are too big for the mode are faulted, and in a UTF mode,
221        disallowed codepoints are also faulted.
222    
223    39. If PCRE was compiled with UTF support, in three places in the DFA
224        matcher there was code that should only have been obeyed in UTF mode, but
225        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
226        processing when bytes with values greater than 127 were present. In 16-bit
227        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
228        both cases the values are those that cannot be the first data item in a UTF
229        character. The three items that might have provoked this were recursions,
230        possessively repeated groups, and atomic groups.
231    
232    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
233        and pcregrep, because some OS require shared objects to be explicitly
234        passed to ld, causing the link step to fail if they are not.
235    
236    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
237        mode, patterns that started with \h* or \R* might be incorrectly matched.
238    
239    
240    Version 8.30 04-February-2012
241    -----------------------------
242    
243    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
244        name is defined in ctype.h.
245    
246    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
247        only in quite long subpatterns.
248    
249    3.  Removed the function pcre_info(), which has been obsolete and deprecated
250        since it was replaced by pcre_fullinfo() in February 2000.
251    
252    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
253        match a (*MARK), and the match failed at the start of the subject, a
254        reference to memory before the start of the subject could occur. This bug
255        was introduced by fix 17 of release 8.21.
256    
257    5.  A reference to an unset group with zero minimum repetition was giving
258        totally wrong answers (in non-JavaScript-compatibility mode). For example,
259        /(another)?(\1?)test/ matched against "hello world test". This bug was
260        introduced in release 8.13.
261    
262    6.  Add support for 16-bit character strings (a large amount of work involving
263        many changes and refactorings).
264    
265    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
266        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
267        from a file.
268    
269    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
270        rounding is not applied in this particular case).
271    
272    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
273        if they appear, or are escaped, in patterns.
274    
275    10. Get rid of a number of -Wunused-but-set-variable warnings.
276    
277    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
278        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
279        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
280        also returns the mark "x". This bug applied to capturing parentheses,
281        non-capturing parentheses, and atomic parentheses. It also applied to some
282        assertions.
283    
284    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
285        information out of configure.ac instead of relying on pcre.h.generic, which
286        is not stored in the repository.
287    
288    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
289        -lreadline.
290    
291    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
292    
293    15. Applied Graycode's patch to put the top-level frame on the stack rather
294        than the heap when not using the stack for recursion. This gives a
295        performance improvement in many cases when recursion is not deep.
296    
297    16. Experimental code added to "pcretest -C" to output the stack frame size.
298    
299    
300    Version 8.21 12-Dec-2011
301  ------------------------  ------------------------
302    
303  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 103  Version 8.21 05-Dec-2011 Line 399  Version 8.21 05-Dec-2011
399  25. The CheckMan script was not being included in the distribution. Also, added  25. The CheckMan script was not being included in the distribution. Also, added
400      an explicit "perl" to run Perl scripts from the PrepareRelease script      an explicit "perl" to run Perl scripts from the PrepareRelease script
401      because this is reportedly needed in Windows.      because this is reportedly needed in Windows.
402    
403  26. If study data was being save in a file and studying had not found a set of  26. If study data was being save in a file and studying had not found a set of
404      "starts with" bytes for the pattern, the data written to the file (though      "starts with" bytes for the pattern, the data written to the file (though
405      never used) was taken from uninitialized memory and so caused valgrind to      never used) was taken from uninitialized memory and so caused valgrind to
406      complain.      complain.
407    
408    27. Updated RunTest.bat as provided by Sheri Pierce.
409    
410    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
411    
412    29. Computation of memory usage for the table of capturing group names was
413        giving an unnecessarily large value.
414    
415    
416  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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