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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 1038 by zherczeg, Wed Sep 12 09:03:23 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  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    
80    Version 8.31 06-July-2012
81    -------------------------
82    
83    1.  Fixing a wrong JIT test case and some compiler warnings.
84    
85    2.  Removed a bashism from the RunTest script.
86    
87    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
88        to unsigned type, result still unsigned" that was given by an MS compiler
89        on encountering the code "-sizeof(xxx)".
90    
91    4.  Partial matching support is added to the JIT compiler.
92    
93    5.  Fixed several bugs concerned with partial matching of items that consist
94        of more than one character:
95    
96        (a) /^(..)\1/ did not partially match "aba" because checking references was
97            done on an "all or nothing" basis. This also applied to repeated
98            references.
99    
100        (b) \R did not give a hard partial match if \r was found at the end of the
101            subject.
102    
103        (c) \X did not give a hard partial match after matching one or more
104            characters at the end of the subject.
105    
106        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
107            a partial match for the string "\r".
108    
109        (e) When newline was set to CRLF, the metacharacter "." did not recognize
110            a partial match for a CR character at the end of the subject string.
111    
112    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
113        running pcretest, the text "(JIT)" added to the output whenever JIT is
114        actually used to run the match.
115    
116    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
117        or /S+[+] with a digit between 1 and 7.
118    
119    8.  OP_NOT now supports any UTF character not just single-byte ones.
120    
121    9.  (*MARK) control verb is now supported by the JIT compiler.
122    
123    10. The command "./RunTest list" lists the available tests without actually
124        running any of them. (Because I keep forgetting what they all are.)
125    
126    11. Add PCRE_INFO_MAXLOOKBEHIND.
127    
128    12. Applied a (slightly modified) user-supplied patch that improves performance
129        when the heap is used for recursion (compiled with --disable-stack-for-
130        recursion). Instead of malloc and free for each heap frame each time a
131        logical recursion happens, frames are retained on a chain and re-used where
132        possible. This sometimes gives as much as 30% improvement.
133    
134    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
135        call.
136    
137    14. As documented, (*COMMIT) is now confined to within a positive assertion.
138    
139    15. It is now possible to link pcretest with libedit as an alternative to
140        libreadline.
141    
142    16. (*COMMIT) control verb is now supported by the JIT compiler.
143    
144    17. The Unicode data tables have been updated to Unicode 6.1.0.
145    
146    18. Added --file-list option to pcregrep.
147    
148    19. Added binary file support to pcregrep, including the -a, --binary-files,
149        -I, and --text options.
150    
151    20. The madvise function is renamed for posix_madvise for QNX compatibility
152        reasons. Fixed by Giuseppe D'Angelo.
153    
154    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
155    
156    22. Changed the option for creating symbolic links for 16-bit man pages from
157        -s to -sf so that re-installing does not cause issues.
158    
159    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
160    
161    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
162        matches in certain environments (the workspace was not being correctly
163        retained). Also added to pcre_dfa_exec() a simple plausibility check on
164        some of the workspace data at the beginning of a restart.
165    
166    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
167        was not doing so when it should - probably a typo introduced by SVN 528
168        (change 8.10/14).
169    
170    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
171        \w+ when the character tables indicated that \x{c4} was a word character.
172        There were several related cases, all because the tests for doing a table
173        lookup were testing for characters less than 127 instead of 255.
174    
175    27. If a pattern contains capturing parentheses that are not used in a match,
176        their slots in the ovector are set to -1. For those that are higher than
177        any matched groups, this happens at the end of processing. In the case when
178        there were back references that the ovector was too small to contain
179        (causing temporary malloc'd memory to be used during matching), and the
180        highest capturing number was not used, memory off the end of the ovector
181        was incorrectly being set to -1. (It was using the size of the temporary
182        memory instead of the true size.)
183    
184    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
185        ovector size, it uses memory at the end of the block that it has got.
186    
187    29. Check for an overlong MARK name and give an error at compile time. The
188        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
189    
190    30. JIT compiler update.
191    
192    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
193        Rill for the patch.
194    
195    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
196    
197    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
198    
199    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
200        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
201        was enabled.
202    
203    35. Improve JIT code generation for greedy plus quantifier.
204    
205    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
206        1 to "aa" instead of to an empty string. The bug affected repeated groups
207        that could potentially match an empty string.
208    
209    37. Optimizing single character iterators in JIT.
210    
211    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
212        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
213        codepoints that are too big for the mode are faulted, and in a UTF mode,
214        disallowed codepoints are also faulted.
215    
216    39. If PCRE was compiled with UTF support, in three places in the DFA
217        matcher there was code that should only have been obeyed in UTF mode, but
218        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
219        processing when bytes with values greater than 127 were present. In 16-bit
220        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
221        both cases the values are those that cannot be the first data item in a UTF
222        character. The three items that might have provoked this were recursions,
223        possessively repeated groups, and atomic groups.
224    
225    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
226        and pcregrep, because some OS require shared objects to be explicitly
227        passed to ld, causing the link step to fail if they are not.
228    
229    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
230        mode, patterns that started with \h* or \R* might be incorrectly matched.
231    
232    
233    Version 8.30 04-February-2012
234    -----------------------------
235    
236    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
237        name is defined in ctype.h.
238    
239    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
240        only in quite long subpatterns.
241    
242    3.  Removed the function pcre_info(), which has been obsolete and deprecated
243        since it was replaced by pcre_fullinfo() in February 2000.
244    
245    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
246        match a (*MARK), and the match failed at the start of the subject, a
247        reference to memory before the start of the subject could occur. This bug
248        was introduced by fix 17 of release 8.21.
249    
250    5.  A reference to an unset group with zero minimum repetition was giving
251        totally wrong answers (in non-JavaScript-compatibility mode). For example,
252        /(another)?(\1?)test/ matched against "hello world test". This bug was
253        introduced in release 8.13.
254    
255    6.  Add support for 16-bit character strings (a large amount of work involving
256        many changes and refactorings).
257    
258    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
259        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
260        from a file.
261    
262    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
263        rounding is not applied in this particular case).
264    
265    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
266        if they appear, or are escaped, in patterns.
267    
268    10. Get rid of a number of -Wunused-but-set-variable warnings.
269    
270    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
271        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
272        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
273        also returns the mark "x". This bug applied to capturing parentheses,
274        non-capturing parentheses, and atomic parentheses. It also applied to some
275        assertions.
276    
277    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
278        information out of configure.ac instead of relying on pcre.h.generic, which
279        is not stored in the repository.
280    
281    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
282        -lreadline.
283    
284    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
285    
286    15. Applied Graycode's patch to put the top-level frame on the stack rather
287        than the heap when not using the stack for recursion. This gives a
288        performance improvement in many cases when recursion is not deep.
289    
290    16. Experimental code added to "pcretest -C" to output the stack frame size.
291    
292    
293    Version 8.21 12-Dec-2011
294    ------------------------
295    
296  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
297    
298    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
299        are added as well.
300    
301    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
302        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
303        calling _pcre_jit_exec. Some extra comments are added.
304    
305    4.  (*MARK) settings inside atomic groups that do not contain any capturing
306        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
307        was introduced by change 18 for 8.20.
308    
309    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
310        ECMA-262 standard.
311    
312    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
313        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
314        This bug was probably introduced by change 9 of 8.13.
315    
316    7.  While fixing 6 above, I noticed that a number of other items were being
317        incorrectly rejected as "not fixed length". This arose partly because newer
318        opcodes had not been added to the fixed-length checking code. I have (a)
319        corrected the bug and added tests for these items, and (b) arranged for an
320        error to occur if an unknown opcode is encountered while checking for fixed
321        length instead of just assuming "not fixed length". The items that were
322        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
323        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
324        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
325    
326    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
327        being incorrectly compiled and would have given unpredicatble results.
328    
329    9.  A possessively repeated subpattern with minimum repeat count greater than
330        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
331        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
332        the first (A) could occur when it should not.
333    
334    10. Add a cast and remove a redundant test from the code.
335    
336    11. JIT should use pcre_malloc/pcre_free for allocation.
337    
338    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
339        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
340        is anything other than /usr, -L is still shown).
341    
342    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
343    
344    14. Perl does not support \N without a following name in a [] class; PCRE now
345        also gives an error.
346    
347    15. If a forward reference was repeated with an upper limit of around 2000,
348        it caused the error "internal error: overran compiling workspace". The
349        maximum number of forward references (including repeats) was limited by the
350        internal workspace, and dependent on the LINK_SIZE. The code has been
351        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
352        the default depends on LINK_SIZE. There is a new upper limit (for safety)
353        of around 200,000 forward references. While doing this, I also speeded up
354        the filling in of repeated forward references.
355    
356    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
357        incorrectly expecting the subject to contain another "a" after the start.
358    
359    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
360        in the match, the SKIP should be ignored. This was not happening; instead
361        the SKIP was being treated as NOMATCH. For patterns such as
362        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
363        tested.
364    
365    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
366        now much more compatible with Perl, in particular in cases where the result
367        is a non-match for a non-anchored pattern. For example, if
368        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
369        "m", where previously it did not return a name. A side effect of this
370        change is that for partial matches, the last encountered mark name is
371        returned, as for non matches. A number of tests that were previously not
372        Perl-compatible have been moved into the Perl-compatible test files. The
373        refactoring has had the pleasing side effect of removing one argument from
374        the match() function, thus reducing its stack requirements.
375    
376    19. If the /S+ option was used in pcretest to study a pattern using JIT,
377        subsequent uses of /S (without +) incorrectly behaved like /S+.
378    
379    21. Retrieve executable code size support for the JIT compiler and fixing
380        some warnings.
381    
382    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
383        not work when the shorter character appeared right at the end of the
384        subject string.
385    
386    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
387        systems.
388    
389    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
390        output it when the /M option is used in pcretest.
391    
392    25. The CheckMan script was not being included in the distribution. Also, added
393        an explicit "perl" to run Perl scripts from the PrepareRelease script
394        because this is reportedly needed in Windows.
395    
396    26. If study data was being save in a file and studying had not found a set of
397        "starts with" bytes for the pattern, the data written to the file (though
398        never used) was taken from uninitialized memory and so caused valgrind to
399        complain.
400    
401    27. Updated RunTest.bat as provided by Sheri Pierce.
402    
403    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
404    
405    29. Computation of memory usage for the table of capturing group names was
406        giving an unnecessarily large value.
407    
408    
409  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
410  ------------------------  ------------------------

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