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revision 729 by ph10, Mon Oct 10 16:02:20 2011 UTC revision 986 by zherczeg, Sat Jul 7 03:33:54 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 10-Oct-2011  Version 8.32
5    ------------
6    
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
9    
10    
11    Version 8.31 06-July-2012
12    -------------------------
13    
14    1.  Fixing a wrong JIT test case and some compiler warnings.
15    
16    2.  Removed a bashism from the RunTest script.
17    
18    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
19        to unsigned type, result still unsigned" that was given by an MS compiler
20        on encountering the code "-sizeof(xxx)".
21    
22    4.  Partial matching support is added to the JIT compiler.
23    
24    5.  Fixed several bugs concerned with partial matching of items that consist
25        of more than one character:
26    
27        (a) /^(..)\1/ did not partially match "aba" because checking references was
28            done on an "all or nothing" basis. This also applied to repeated
29            references.
30    
31        (b) \R did not give a hard partial match if \r was found at the end of the
32            subject.
33    
34        (c) \X did not give a hard partial match after matching one or more
35            characters at the end of the subject.
36    
37        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
38            a partial match for the string "\r".
39    
40        (e) When newline was set to CRLF, the metacharacter "." did not recognize
41            a partial match for a CR character at the end of the subject string.
42    
43    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
44        running pcretest, the text "(JIT)" added to the output whenever JIT is
45        actually used to run the match.
46    
47    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
48        or /S+[+] with a digit between 1 and 7.
49    
50    8.  OP_NOT now supports any UTF character not just single-byte ones.
51    
52    9.  (*MARK) control verb is now supported by the JIT compiler.
53    
54    10. The command "./RunTest list" lists the available tests without actually
55        running any of them. (Because I keep forgetting what they all are.)
56    
57    11. Add PCRE_INFO_MAXLOOKBEHIND.
58    
59    12. Applied a (slightly modified) user-supplied patch that improves performance
60        when the heap is used for recursion (compiled with --disable-stack-for-
61        recursion). Instead of malloc and free for each heap frame each time a
62        logical recursion happens, frames are retained on a chain and re-used where
63        possible. This sometimes gives as much as 30% improvement.
64    
65    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
66        call.
67    
68    14. As documented, (*COMMIT) is now confined to within a positive assertion.
69    
70    15. It is now possible to link pcretest with libedit as an alternative to
71        libreadline.
72    
73    16. (*COMMIT) control verb is now supported by the JIT compiler.
74    
75    17. The Unicode data tables have been updated to Unicode 6.1.0.
76    
77    18. Added --file-list option to pcregrep.
78    
79    19. Added binary file support to pcregrep, including the -a, --binary-files,
80        -I, and --text options.
81    
82    20. The madvise function is renamed for posix_madvise for QNX compatibility
83        reasons. Fixed by Giuseppe D'Angelo.
84    
85    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
86    
87    22. Changed the option for creating symbolic links for 16-bit man pages from
88        -s to -sf so that re-installing does not cause issues.
89    
90    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
91    
92    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
93        matches in certain environments (the workspace was not being correctly
94        retained). Also added to pcre_dfa_exec() a simple plausibility check on
95        some of the workspace data at the beginning of a restart.
96    
97    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
98        was not doing so when it should - probably a typo introduced by SVN 528
99        (change 8.10/14).
100    
101    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
102        \w+ when the character tables indicated that \x{c4} was a word character.
103        There were several related cases, all because the tests for doing a table
104        lookup were testing for characters less than 127 instead of 255.
105    
106    27. If a pattern contains capturing parentheses that are not used in a match,
107        their slots in the ovector are set to -1. For those that are higher than
108        any matched groups, this happens at the end of processing. In the case when
109        there were back references that the ovector was too small to contain
110        (causing temporary malloc'd memory to be used during matching), and the
111        highest capturing number was not used, memory off the end of the ovector
112        was incorrectly being set to -1. (It was using the size of the temporary
113        memory instead of the true size.)
114    
115    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
116        ovector size, it uses memory at the end of the block that it has got.
117    
118    29. Check for an overlong MARK name and give an error at compile time. The
119        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
120    
121    30. JIT compiler update.
122    
123    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
124        Rill for the patch.
125    
126    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
127    
128    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
129    
130    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
131        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
132        was enabled.
133    
134    35. Improve JIT code generation for greedy plus quantifier.
135    
136    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
137        1 to "aa" instead of to an empty string. The bug affected repeated groups
138        that could potentially match an empty string.
139    
140    37. Optimizing single character iterators in JIT.
141    
142    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
143        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
144        codepoints that are too big for the mode are faulted, and in a UTF mode,
145        disallowed codepoints are also faulted.
146    
147    39. If PCRE was compiled with UTF support, in three places in the DFA
148        matcher there was code that should only have been obeyed in UTF mode, but
149        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
150        processing when bytes with values greater than 127 were present. In 16-bit
151        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
152        both cases the values are those that cannot be the first data item in a UTF
153        character. The three items that might have provoked this were recursions,
154        possessively repeated groups, and atomic groups.
155    
156    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
157        and pcregrep, because some OS require shared objects to be explicitly
158        passed to ld, causing the link step to fail if they are not.
159    
160    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
161        mode, patterns that started with \h* or \R* might be incorrectly matched.
162    
163    
164    Version 8.30 04-February-2012
165    -----------------------------
166    
167    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
168        name is defined in ctype.h.
169    
170    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
171        only in quite long subpatterns.
172    
173    3.  Removed the function pcre_info(), which has been obsolete and deprecated
174        since it was replaced by pcre_fullinfo() in February 2000.
175    
176    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
177        match a (*MARK), and the match failed at the start of the subject, a
178        reference to memory before the start of the subject could occur. This bug
179        was introduced by fix 17 of release 8.21.
180    
181    5.  A reference to an unset group with zero minimum repetition was giving
182        totally wrong answers (in non-JavaScript-compatibility mode). For example,
183        /(another)?(\1?)test/ matched against "hello world test". This bug was
184        introduced in release 8.13.
185    
186    6.  Add support for 16-bit character strings (a large amount of work involving
187        many changes and refactorings).
188    
189    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
190        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
191        from a file.
192    
193    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
194        rounding is not applied in this particular case).
195    
196    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
197        if they appear, or are escaped, in patterns.
198    
199    10. Get rid of a number of -Wunused-but-set-variable warnings.
200    
201    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
202        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
203        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
204        also returns the mark "x". This bug applied to capturing parentheses,
205        non-capturing parentheses, and atomic parentheses. It also applied to some
206        assertions.
207    
208    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
209        information out of configure.ac instead of relying on pcre.h.generic, which
210        is not stored in the repository.
211    
212    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
213        -lreadline.
214    
215    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
216    
217    15. Applied Graycode's patch to put the top-level frame on the stack rather
218        than the heap when not using the stack for recursion. This gives a
219        performance improvement in many cases when recursion is not deep.
220    
221    16. Experimental code added to "pcretest -C" to output the stack frame size.
222    
223    
224    Version 8.21 12-Dec-2011
225    ------------------------
226    
227    1.  Updating the JIT compiler.
228    
229    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
230        are added as well.
231    
232    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
233        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
234        calling _pcre_jit_exec. Some extra comments are added.
235    
236    4.  (*MARK) settings inside atomic groups that do not contain any capturing
237        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
238        was introduced by change 18 for 8.20.
239    
240    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
241        ECMA-262 standard.
242    
243    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
244        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
245        This bug was probably introduced by change 9 of 8.13.
246    
247    7.  While fixing 6 above, I noticed that a number of other items were being
248        incorrectly rejected as "not fixed length". This arose partly because newer
249        opcodes had not been added to the fixed-length checking code. I have (a)
250        corrected the bug and added tests for these items, and (b) arranged for an
251        error to occur if an unknown opcode is encountered while checking for fixed
252        length instead of just assuming "not fixed length". The items that were
253        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
254        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
255        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
256    
257    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
258        being incorrectly compiled and would have given unpredicatble results.
259    
260    9.  A possessively repeated subpattern with minimum repeat count greater than
261        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
262        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
263        the first (A) could occur when it should not.
264    
265    10. Add a cast and remove a redundant test from the code.
266    
267    11. JIT should use pcre_malloc/pcre_free for allocation.
268    
269    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
270        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
271        is anything other than /usr, -L is still shown).
272    
273    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
274    
275    14. Perl does not support \N without a following name in a [] class; PCRE now
276        also gives an error.
277    
278    15. If a forward reference was repeated with an upper limit of around 2000,
279        it caused the error "internal error: overran compiling workspace". The
280        maximum number of forward references (including repeats) was limited by the
281        internal workspace, and dependent on the LINK_SIZE. The code has been
282        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
283        the default depends on LINK_SIZE. There is a new upper limit (for safety)
284        of around 200,000 forward references. While doing this, I also speeded up
285        the filling in of repeated forward references.
286    
287    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
288        incorrectly expecting the subject to contain another "a" after the start.
289    
290    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
291        in the match, the SKIP should be ignored. This was not happening; instead
292        the SKIP was being treated as NOMATCH. For patterns such as
293        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
294        tested.
295    
296    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
297        now much more compatible with Perl, in particular in cases where the result
298        is a non-match for a non-anchored pattern. For example, if
299        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
300        "m", where previously it did not return a name. A side effect of this
301        change is that for partial matches, the last encountered mark name is
302        returned, as for non matches. A number of tests that were previously not
303        Perl-compatible have been moved into the Perl-compatible test files. The
304        refactoring has had the pleasing side effect of removing one argument from
305        the match() function, thus reducing its stack requirements.
306    
307    19. If the /S+ option was used in pcretest to study a pattern using JIT,
308        subsequent uses of /S (without +) incorrectly behaved like /S+.
309    
310    21. Retrieve executable code size support for the JIT compiler and fixing
311        some warnings.
312    
313    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
314        not work when the shorter character appeared right at the end of the
315        subject string.
316    
317    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
318        systems.
319    
320    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
321        output it when the /M option is used in pcretest.
322    
323    25. The CheckMan script was not being included in the distribution. Also, added
324        an explicit "perl" to run Perl scripts from the PrepareRelease script
325        because this is reportedly needed in Windows.
326    
327    26. If study data was being save in a file and studying had not found a set of
328        "starts with" bytes for the pattern, the data written to the file (though
329        never used) was taken from uninitialized memory and so caused valgrind to
330        complain.
331    
332    27. Updated RunTest.bat as provided by Sheri Pierce.
333    
334    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
335    
336    29. Computation of memory usage for the table of capturing group names was
337        giving an unnecessarily large value.
338    
339    
340    Version 8.20 21-Oct-2011
341  ------------------------  ------------------------
342    
343  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
# Line 65  Version 8.20 10-Oct-2011 Line 401  Version 8.20 10-Oct-2011
401      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
402      optimizations are restored. It would be nice to do this on a per-group      optimizations are restored. It would be nice to do this on a per-group
403      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
404    
405  12. In some environments, the output of pcretest -C is CRLF terminated. This  12. In some environments, the output of pcretest -C is CRLF terminated. This
406      broke RunTest's code that checks for the link size. A single white space      broke RunTest's code that checks for the link size. A single white space
407      after the value is now allowed for.      character after the value is now allowed for.
408    
409  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
410      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
411    
412  14. If (*THEN) appeared in a group that was called recursively or as a  14. If (*THEN) appeared in a group that was called recursively or as a
413      subroutine, it did not work as intended. [But see next item.]      subroutine, it did not work as intended. [But see next item.]
414    
415  15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex  15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
416      pattern fragments (but not containing any | characters). If A and B are      pattern fragments (but not containing any | characters). If A and B are
417      matched, but there is a failure in C so that it backtracks to (*THEN), PCRE      matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
418      was behaving differently to Perl. PCRE backtracked into A, but Perl goes to      was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
419      D. In other words, Perl considers parentheses that do not contain any |      D. In other words, Perl considers parentheses that do not contain any |
420      characters to be part of a surrounding alternative, whereas PCRE was      characters to be part of a surrounding alternative, whereas PCRE was
421      treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles      treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
422      differently. PCRE now behaves in the same way as Perl, except in the case      differently. PCRE now behaves in the same way as Perl, except in the case
423      of subroutine/recursion calls such as (?1) which have in any case always      of subroutine/recursion calls such as (?1) which have in any case always
424      been different (but PCRE had them first :-).      been different (but PCRE had them first :-).
425    
426  16. Related to 15 above: Perl does not treat the | in a conditional group as  16. Related to 15 above: Perl does not treat the | in a conditional group as
427      creating alternatives. Such a group is treated in the same way as an      creating alternatives. Such a group is treated in the same way as an
428      ordinary group without any | characters when processing (*THEN). PCRE has      ordinary group without any | characters when processing (*THEN). PCRE has
429      been changed to match Perl's behaviour.      been changed to match Perl's behaviour.
430    
431  17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the  17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
432      RunGrepTest script failed.      RunGrepTest script failed.
433    
434  18. Change 22 for version 13 caused atomic groups to use more stack. This is  18. Change 22 for version 13 caused atomic groups to use more stack. This is
435      inevitable for groups that contain captures, but it can lead to a lot of      inevitable for groups that contain captures, but it can lead to a lot of
436      stack use in large patterns. The old behaviour has been restored for atomic      stack use in large patterns. The old behaviour has been restored for atomic
437      groups that do not contain any capturing parentheses.      groups that do not contain any capturing parentheses.
438    
439  19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not  19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
440      suppress the check for a minimum subject length at run time. (If it was      suppress the check for a minimum subject length at run time. (If it was
441      given to pcre_exec() or pcre_dfa_exec() it did work.)      given to pcre_exec() or pcre_dfa_exec() it did work.)
442    
443    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
444        fail to work when decoding hex characters in data strings in EBCDIC
445        environments.
446    
447    21. It appears that in at least one Mac OS environment, the isxdigit() function
448        is implemented as a macro that evaluates to its argument more than once,
449        contravening the C 90 Standard (I haven't checked a later standard). There
450        was an instance in pcretest which caused it to go wrong when processing
451        \x{...} escapes in subject strings. The has been rewritten to avoid using
452        things like p++ in the argument of isxdigit().
453    
454    
455  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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