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revision 742 by zherczeg, Sun Nov 6 08:05:33 2011 UTC revision 1298 by ph10, Fri Mar 22 16:13:13 2013 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.33 xx-xxxx-201x
5  ------------  -------------------------
6    
7    1.  Added 'U' to some constants that are compared to unsigned integers, to
8        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
9        variables that are added to signed variables, to ensure the result is
10        signed and can be negated.
11    
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
14    
15    3.  Revise the creation of config.h.generic so that all boolean macros are
16        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
17        overriding via -D on the command line possible.
18    
19    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
20        to unsigned int is reported to make a quite noticeable speed difference in
21        a specific Windows environment. Testing on Linux did also appear to show
22        some benefit (and it is clearly not harmful). Also fixed the definition of
23        Xop which should be unsigned.
24    
25    5.  Related to (4), changing the definition of the intermediate variable cc
26        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
27        improvements.
28    
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
31    
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
34    
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
36    
37    9.  Optimizing fast_forward_start_bits in JIT.
38    
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
41    
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
43    
44        (b) Minimum length was not checked before the matching is started.
45    
46    11. The value of capture_last that is passed to callouts was incorrect in some
47        cases when there was a capture on one path that was subsequently abandoned
48        after a backtrack. Also, the capture_last value is now reset after a
49        recursion, since all captures are also reset in this case.
50    
51    12. The interpreter no longer returns the "too many substrings" error in the
52        case when an overflowing capture is in a branch that is subsequently
53        abandoned after a backtrack.
54    
55    13. In the pathological case when an offset vector of size 2 is used, pcretest
56        now prints out the matched string after a yield of 0 or 1.
57    
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
60    
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
62    
63    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
64        offset of the starting point of the matching process, provided the offsets
65        vector is large enough.
66    
67    17. The \A escape now records a lookbehind value of 1, though its execution
68        does not actually inspect the previous character. This is to ensure that,
69        in partial multi-segment matching, at least one character from the old
70        segment is retained when a new segment is processed. Otherwise, if there
71        are no lookbehinds in the pattern, \A might match incorrectly at the start
72        of a new segment.
73    
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
75    
76    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
77        gives some modest performance improvement in 8-bit mode.
78    
79    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
80        be expressed in certain programming languages using Universal Character
81        Names.
82    
83    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
84        which points out that "non characters" are not "characters that may not
85        appear in Unicode strings" but rather "characters that are reserved for
86        internal use and have only local meaning".
87    
88    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
89        there was a conditional group that depended on an assertion, if the
90        assertion was false, the callout that immediately followed the alternation
91        in the condition was skipped when pcre_exec() was used for matching.
92    
93    23. Allow an explicit callout to be inserted before an assertion that is the
94        condition for a conditional group, for compatibility with automatic
95        callouts, which always insert a callout at this point.
96    
97    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
98        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
99    
100    25. (*PRUNE) is now supported by the JIT compiler.
101    
102    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
103    
104    27. Fix the case where there are two or more SKIPs with arguments that may be
105        ignored.
106    
107    28. Experimental support of (*SKIP) backtracking verb in the JIT compiler.
108    
109    29. Experimental support of (*THEN) backtracking verb in the JIT compiler.
110    
111    30. Update RunTest with additional test selector options.
112    
113    31. The way PCRE handles backtracking verbs has been changed in to ways.
114    
115        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
116        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
117        backtracking. In some cases this makes it more Perl-compatible, but Perl's
118        rather obscure rules do not always do the same thing.
119    
120        (2) Previously, backtracking verbs were confined within assertions. This is
121        no longer the case, except for (*ACCEPT). Again, this sometimes improves
122        Perl compatibility, and sometimes does not.
123    
124    
125    Version 8.32 30-November-2012
126    -----------------------------
127    
128    1.  Improved JIT compiler optimizations for first character search and single
129        character iterators.
130    
131    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
132        Patch by Daniel Richard G.
133    
134    3.  Single character iterator optimizations in the JIT compiler.
135    
136    4.  Improved JIT compiler optimizations for character ranges.
137    
138    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
139        Reported by Giuseppe D'Angelo.
140    
141    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
142        of a line, was being set incorrectly in cases where .* appeared inside
143        atomic brackets at the start of a pattern, or where there was a subsequent
144        *PRUNE or *SKIP.
145    
146    7.  Improved instruction cache flush for POWER/PowerPC.
147        Patch by Daniel Richard G.
148    
149    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
150        grep:
151    
152        (a) There is now no limit to the number of patterns to be matched.
153    
154        (b) An error is given if a pattern is too long.
155    
156        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
157            are now supported.
158    
159        (d) --exclude-from and --include-from (multiple use) have been added.
160    
161        (e) Exclusions and inclusions now apply to all files and directories, not
162            just to those obtained from scanning a directory recursively.
163    
164        (f) Multiple uses of -f and --file-list are now supported.
165    
166        (g) In a Windows environment, the default for -d has been changed from
167            "read" (the GNU grep default) to "skip", because otherwise the presence
168            of a directory in the file list provokes an error.
169    
170        (h) The documentation has been revised and clarified in places.
171    
172    9.  Improve the matching speed of capturing brackets.
173    
174    10. Changed the meaning of \X so that it now matches a Unicode extended
175        grapheme cluster.
176    
177    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
178        out POSIX threads when JIT support is configured.
179    
180    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
181    
182    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
183        structure could go wrong in environments where size_t is not the same size
184        as int.
185    
186    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
187        set.
188    
189    15. The EBCDIC support had decayed; later updates to the code had included
190        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
191        general tidy up of EBCDIC-related issues, and the documentation was also
192        not quite right. There is now a test that can be run on ASCII systems to
193        check some of the EBCDIC-related things (but is it not a full test).
194    
195    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
196        in a small tidy to the code.
197    
198    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
199    
200    18. If the --only-matching (-o) option in pcregrep is specified multiple
201        times, each one causes appropriate output. For example, -o1 -o2 outputs the
202        substrings matched by the 1st and 2nd capturing parentheses. A separating
203        string can be specified by --om-separator (default empty).
204    
205    19. Improving the first n character searches.
206    
207    20. Turn case lists for horizontal and vertical white space into macros so that
208        they are defined only once.
209    
210    21. This set of changes together give more compatible Unicode case-folding
211        behaviour for characters that have more than one other case when UCP
212        support is available.
213    
214        (a) The Unicode property table now has offsets into a new table of sets of
215            three or more characters that are case-equivalent. The MultiStage2.py
216            script that generates these tables (the pcre_ucd.c file) now scans
217            CaseFolding.txt instead of UnicodeData.txt for character case
218            information.
219    
220        (b) The code for adding characters or ranges of characters to a character
221            class has been abstracted into a generalized function that also handles
222            case-independence. In UTF-mode with UCP support, this uses the new data
223            to handle characters with more than one other case.
224    
225        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
226            whose other case is greater than 256 are now correctly matched
227            caselessly. Previously, the high codepoint matched the low one, but not
228            vice versa.
229    
230        (d) The processing of \h, \H, \v, and \ in character classes now makes use
231            of the new class addition function, using character lists defined as
232            macros alongside the case definitions of 20 above.
233    
234        (e) Caseless back references now work with characters that have more than
235            one other case.
236    
237        (f) General caseless matching of characters with more than one other case
238            is supported.
239    
240    22. Unicode character properties were updated from Unicode 6.2.0
241    
242    23. Improved CMake support under Windows. Patch by Daniel Richard G.
243    
244    24. Add support for 32-bit character strings, and UTF-32
245    
246    25. Major JIT compiler update (code refactoring and bugfixing).
247        Experimental Sparc 32 support is added.
248    
249    26. Applied a modified version of Daniel Richard G's patch to create
250        pcre.h.generic and config.h.generic by "make" instead of in the
251        PrepareRelease script.
252    
253    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
254        pcre_compile.c when checking for a zero character.
255    
256    28. Introducing a native interface for JIT. Through this interface, the compiled
257        machine code can be directly executed. The purpose of this interface is to
258        provide fast pattern matching, so several sanity checks are not performed.
259        However, feature tests are still performed. The new interface provides
260        1.4x speedup compared to the old one.
261    
262    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
263        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
264        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
265    
266    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
267        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
268        the "old" RFC 2279). Instead, it ended up passing a negative length to
269        pcre_exec().
270    
271    31. Add support for GCC's visibility feature to hide internal functions.
272    
273    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
274        "unknown -C option" after outputting 0 or 1.
275    
276    33. There is now support for generating a code coverage report for the test
277        suite in environments where gcc is the compiler and lcov is installed. This
278        is mainly for the benefit of the developers.
279    
280    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
281        unaddressable using valgrind annotations, allowing valgrind to detect
282        invalid memory accesses. This is mainly for the benefit of the developers.
283    
284    25. (*UTF) can now be used to start a pattern in any of the three libraries.
285    
286    26. Give configure error if --enable-cpp but no C++ compiler found.
287    
288    
289    Version 8.31 06-July-2012
290    -------------------------
291    
292    1.  Fixing a wrong JIT test case and some compiler warnings.
293    
294    2.  Removed a bashism from the RunTest script.
295    
296    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
297        to unsigned type, result still unsigned" that was given by an MS compiler
298        on encountering the code "-sizeof(xxx)".
299    
300    4.  Partial matching support is added to the JIT compiler.
301    
302    5.  Fixed several bugs concerned with partial matching of items that consist
303        of more than one character:
304    
305        (a) /^(..)\1/ did not partially match "aba" because checking references was
306            done on an "all or nothing" basis. This also applied to repeated
307            references.
308    
309        (b) \R did not give a hard partial match if \r was found at the end of the
310            subject.
311    
312        (c) \X did not give a hard partial match after matching one or more
313            characters at the end of the subject.
314    
315        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
316            a partial match for the string "\r".
317    
318        (e) When newline was set to CRLF, the metacharacter "." did not recognize
319            a partial match for a CR character at the end of the subject string.
320    
321    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
322        running pcretest, the text "(JIT)" added to the output whenever JIT is
323        actually used to run the match.
324    
325    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
326        or /S+[+] with a digit between 1 and 7.
327    
328    8.  OP_NOT now supports any UTF character not just single-byte ones.
329    
330    9.  (*MARK) control verb is now supported by the JIT compiler.
331    
332    10. The command "./RunTest list" lists the available tests without actually
333        running any of them. (Because I keep forgetting what they all are.)
334    
335    11. Add PCRE_INFO_MAXLOOKBEHIND.
336    
337    12. Applied a (slightly modified) user-supplied patch that improves performance
338        when the heap is used for recursion (compiled with --disable-stack-for-
339        recursion). Instead of malloc and free for each heap frame each time a
340        logical recursion happens, frames are retained on a chain and re-used where
341        possible. This sometimes gives as much as 30% improvement.
342    
343    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
344        call.
345    
346    14. As documented, (*COMMIT) is now confined to within a positive assertion.
347    
348    15. It is now possible to link pcretest with libedit as an alternative to
349        libreadline.
350    
351    16. (*COMMIT) control verb is now supported by the JIT compiler.
352    
353    17. The Unicode data tables have been updated to Unicode 6.1.0.
354    
355    18. Added --file-list option to pcregrep.
356    
357    19. Added binary file support to pcregrep, including the -a, --binary-files,
358        -I, and --text options.
359    
360    20. The madvise function is renamed for posix_madvise for QNX compatibility
361        reasons. Fixed by Giuseppe D'Angelo.
362    
363    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
364    
365    22. Changed the option for creating symbolic links for 16-bit man pages from
366        -s to -sf so that re-installing does not cause issues.
367    
368    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
369    
370    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
371        matches in certain environments (the workspace was not being correctly
372        retained). Also added to pcre_dfa_exec() a simple plausibility check on
373        some of the workspace data at the beginning of a restart.
374    
375    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
376        was not doing so when it should - probably a typo introduced by SVN 528
377        (change 8.10/14).
378    
379    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
380        \w+ when the character tables indicated that \x{c4} was a word character.
381        There were several related cases, all because the tests for doing a table
382        lookup were testing for characters less than 127 instead of 255.
383    
384    27. If a pattern contains capturing parentheses that are not used in a match,
385        their slots in the ovector are set to -1. For those that are higher than
386        any matched groups, this happens at the end of processing. In the case when
387        there were back references that the ovector was too small to contain
388        (causing temporary malloc'd memory to be used during matching), and the
389        highest capturing number was not used, memory off the end of the ovector
390        was incorrectly being set to -1. (It was using the size of the temporary
391        memory instead of the true size.)
392    
393    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
394        ovector size, it uses memory at the end of the block that it has got.
395    
396    29. Check for an overlong MARK name and give an error at compile time. The
397        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
398    
399    30. JIT compiler update.
400    
401    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
402        Rill for the patch.
403    
404    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
405    
406    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
407    
408    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
409        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
410        was enabled.
411    
412    35. Improve JIT code generation for greedy plus quantifier.
413    
414    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
415        1 to "aa" instead of to an empty string. The bug affected repeated groups
416        that could potentially match an empty string.
417    
418    37. Optimizing single character iterators in JIT.
419    
420    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
421        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
422        codepoints that are too big for the mode are faulted, and in a UTF mode,
423        disallowed codepoints are also faulted.
424    
425    39. If PCRE was compiled with UTF support, in three places in the DFA
426        matcher there was code that should only have been obeyed in UTF mode, but
427        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
428        processing when bytes with values greater than 127 were present. In 16-bit
429        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
430        both cases the values are those that cannot be the first data item in a UTF
431        character. The three items that might have provoked this were recursions,
432        possessively repeated groups, and atomic groups.
433    
434    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
435        and pcregrep, because some OS require shared objects to be explicitly
436        passed to ld, causing the link step to fail if they are not.
437    
438    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
439        mode, patterns that started with \h* or \R* might be incorrectly matched.
440    
441    
442    Version 8.30 04-February-2012
443    -----------------------------
444    
445    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
446        name is defined in ctype.h.
447    
448    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
449        only in quite long subpatterns.
450    
451    3.  Removed the function pcre_info(), which has been obsolete and deprecated
452        since it was replaced by pcre_fullinfo() in February 2000.
453    
454    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
455        match a (*MARK), and the match failed at the start of the subject, a
456        reference to memory before the start of the subject could occur. This bug
457        was introduced by fix 17 of release 8.21.
458    
459    5.  A reference to an unset group with zero minimum repetition was giving
460        totally wrong answers (in non-JavaScript-compatibility mode). For example,
461        /(another)?(\1?)test/ matched against "hello world test". This bug was
462        introduced in release 8.13.
463    
464    6.  Add support for 16-bit character strings (a large amount of work involving
465        many changes and refactorings).
466    
467    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
468        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
469        from a file.
470    
471    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
472        rounding is not applied in this particular case).
473    
474    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
475        if they appear, or are escaped, in patterns.
476    
477    10. Get rid of a number of -Wunused-but-set-variable warnings.
478    
479    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
480        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
481        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
482        also returns the mark "x". This bug applied to capturing parentheses,
483        non-capturing parentheses, and atomic parentheses. It also applied to some
484        assertions.
485    
486    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
487        information out of configure.ac instead of relying on pcre.h.generic, which
488        is not stored in the repository.
489    
490    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
491        -lreadline.
492    
493    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
494    
495    15. Applied Graycode's patch to put the top-level frame on the stack rather
496        than the heap when not using the stack for recursion. This gives a
497        performance improvement in many cases when recursion is not deep.
498    
499    16. Experimental code added to "pcretest -C" to output the stack frame size.
500    
501    
502    Version 8.21 12-Dec-2011
503    ------------------------
504    
505  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
506    
# Line 13  Version 8.21 Line 511  Version 8.21
511      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
512      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
513    
514    4.  (*MARK) settings inside atomic groups that do not contain any capturing
515        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
516        was introduced by change 18 for 8.20.
517    
518    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
519        ECMA-262 standard.
520    
521    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
522        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
523        This bug was probably introduced by change 9 of 8.13.
524    
525    7.  While fixing 6 above, I noticed that a number of other items were being
526        incorrectly rejected as "not fixed length". This arose partly because newer
527        opcodes had not been added to the fixed-length checking code. I have (a)
528        corrected the bug and added tests for these items, and (b) arranged for an
529        error to occur if an unknown opcode is encountered while checking for fixed
530        length instead of just assuming "not fixed length". The items that were
531        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
532        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
533        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
534    
535    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
536        being incorrectly compiled and would have given unpredicatble results.
537    
538    9.  A possessively repeated subpattern with minimum repeat count greater than
539        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
540        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
541        the first (A) could occur when it should not.
542    
543    10. Add a cast and remove a redundant test from the code.
544    
545    11. JIT should use pcre_malloc/pcre_free for allocation.
546    
547    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
548        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
549        is anything other than /usr, -L is still shown).
550    
551    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
552    
553    14. Perl does not support \N without a following name in a [] class; PCRE now
554        also gives an error.
555    
556    15. If a forward reference was repeated with an upper limit of around 2000,
557        it caused the error "internal error: overran compiling workspace". The
558        maximum number of forward references (including repeats) was limited by the
559        internal workspace, and dependent on the LINK_SIZE. The code has been
560        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
561        the default depends on LINK_SIZE. There is a new upper limit (for safety)
562        of around 200,000 forward references. While doing this, I also speeded up
563        the filling in of repeated forward references.
564    
565    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
566        incorrectly expecting the subject to contain another "a" after the start.
567    
568    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
569        in the match, the SKIP should be ignored. This was not happening; instead
570        the SKIP was being treated as NOMATCH. For patterns such as
571        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
572        tested.
573    
574    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
575        now much more compatible with Perl, in particular in cases where the result
576        is a non-match for a non-anchored pattern. For example, if
577        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
578        "m", where previously it did not return a name. A side effect of this
579        change is that for partial matches, the last encountered mark name is
580        returned, as for non matches. A number of tests that were previously not
581        Perl-compatible have been moved into the Perl-compatible test files. The
582        refactoring has had the pleasing side effect of removing one argument from
583        the match() function, thus reducing its stack requirements.
584    
585    19. If the /S+ option was used in pcretest to study a pattern using JIT,
586        subsequent uses of /S (without +) incorrectly behaved like /S+.
587    
588    21. Retrieve executable code size support for the JIT compiler and fixing
589        some warnings.
590    
591    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
592        not work when the shorter character appeared right at the end of the
593        subject string.
594    
595    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
596        systems.
597    
598    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
599        output it when the /M option is used in pcretest.
600    
601    25. The CheckMan script was not being included in the distribution. Also, added
602        an explicit "perl" to run Perl scripts from the PrepareRelease script
603        because this is reportedly needed in Windows.
604    
605    26. If study data was being save in a file and studying had not found a set of
606        "starts with" bytes for the pattern, the data written to the file (though
607        never used) was taken from uninitialized memory and so caused valgrind to
608        complain.
609    
610    27. Updated RunTest.bat as provided by Sheri Pierce.
611    
612    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
613    
614    29. Computation of memory usage for the table of capturing group names was
615        giving an unnecessarily large value.
616    
617    
618  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
619  ------------------------  ------------------------

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