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revision 742 by zherczeg, Sun Nov 6 08:05:33 2011 UTC revision 1302 by ph10, Wed Mar 27 11:13:36 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. (*SKIP) is now supported by the JIT compiler.
108    
109    29. (*THEN) is now supported by 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 two 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 for positive assertions, except for (*ACCEPT). Again,
122        this sometimes improves Perl compatibility, and sometimes does not.
123    
124    32. A number of tests that were in test 2 because Perl did things differently
125        have been moved to test 1, because either Perl or PCRE has changed, and
126        these tests are now compatible.
127    
128    32. Control verbs are handled in the same way in JIT and interpreter.
129    
130    
131    Version 8.32 30-November-2012
132    -----------------------------
133    
134    1.  Improved JIT compiler optimizations for first character search and single
135        character iterators.
136    
137    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
138        Patch by Daniel Richard G.
139    
140    3.  Single character iterator optimizations in the JIT compiler.
141    
142    4.  Improved JIT compiler optimizations for character ranges.
143    
144    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
145        Reported by Giuseppe D'Angelo.
146    
147    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
148        of a line, was being set incorrectly in cases where .* appeared inside
149        atomic brackets at the start of a pattern, or where there was a subsequent
150        *PRUNE or *SKIP.
151    
152    7.  Improved instruction cache flush for POWER/PowerPC.
153        Patch by Daniel Richard G.
154    
155    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
156        grep:
157    
158        (a) There is now no limit to the number of patterns to be matched.
159    
160        (b) An error is given if a pattern is too long.
161    
162        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
163            are now supported.
164    
165        (d) --exclude-from and --include-from (multiple use) have been added.
166    
167        (e) Exclusions and inclusions now apply to all files and directories, not
168            just to those obtained from scanning a directory recursively.
169    
170        (f) Multiple uses of -f and --file-list are now supported.
171    
172        (g) In a Windows environment, the default for -d has been changed from
173            "read" (the GNU grep default) to "skip", because otherwise the presence
174            of a directory in the file list provokes an error.
175    
176        (h) The documentation has been revised and clarified in places.
177    
178    9.  Improve the matching speed of capturing brackets.
179    
180    10. Changed the meaning of \X so that it now matches a Unicode extended
181        grapheme cluster.
182    
183    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
184        out POSIX threads when JIT support is configured.
185    
186    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
187    
188    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
189        structure could go wrong in environments where size_t is not the same size
190        as int.
191    
192    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
193        set.
194    
195    15. The EBCDIC support had decayed; later updates to the code had included
196        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
197        general tidy up of EBCDIC-related issues, and the documentation was also
198        not quite right. There is now a test that can be run on ASCII systems to
199        check some of the EBCDIC-related things (but is it not a full test).
200    
201    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
202        in a small tidy to the code.
203    
204    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
205    
206    18. If the --only-matching (-o) option in pcregrep is specified multiple
207        times, each one causes appropriate output. For example, -o1 -o2 outputs the
208        substrings matched by the 1st and 2nd capturing parentheses. A separating
209        string can be specified by --om-separator (default empty).
210    
211    19. Improving the first n character searches.
212    
213    20. Turn case lists for horizontal and vertical white space into macros so that
214        they are defined only once.
215    
216    21. This set of changes together give more compatible Unicode case-folding
217        behaviour for characters that have more than one other case when UCP
218        support is available.
219    
220        (a) The Unicode property table now has offsets into a new table of sets of
221            three or more characters that are case-equivalent. The MultiStage2.py
222            script that generates these tables (the pcre_ucd.c file) now scans
223            CaseFolding.txt instead of UnicodeData.txt for character case
224            information.
225    
226        (b) The code for adding characters or ranges of characters to a character
227            class has been abstracted into a generalized function that also handles
228            case-independence. In UTF-mode with UCP support, this uses the new data
229            to handle characters with more than one other case.
230    
231        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
232            whose other case is greater than 256 are now correctly matched
233            caselessly. Previously, the high codepoint matched the low one, but not
234            vice versa.
235    
236        (d) The processing of \h, \H, \v, and \ in character classes now makes use
237            of the new class addition function, using character lists defined as
238            macros alongside the case definitions of 20 above.
239    
240        (e) Caseless back references now work with characters that have more than
241            one other case.
242    
243        (f) General caseless matching of characters with more than one other case
244            is supported.
245    
246    22. Unicode character properties were updated from Unicode 6.2.0
247    
248    23. Improved CMake support under Windows. Patch by Daniel Richard G.
249    
250    24. Add support for 32-bit character strings, and UTF-32
251    
252    25. Major JIT compiler update (code refactoring and bugfixing).
253        Experimental Sparc 32 support is added.
254    
255    26. Applied a modified version of Daniel Richard G's patch to create
256        pcre.h.generic and config.h.generic by "make" instead of in the
257        PrepareRelease script.
258    
259    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
260        pcre_compile.c when checking for a zero character.
261    
262    28. Introducing a native interface for JIT. Through this interface, the compiled
263        machine code can be directly executed. The purpose of this interface is to
264        provide fast pattern matching, so several sanity checks are not performed.
265        However, feature tests are still performed. The new interface provides
266        1.4x speedup compared to the old one.
267    
268    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
269        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
270        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
271    
272    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
273        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
274        the "old" RFC 2279). Instead, it ended up passing a negative length to
275        pcre_exec().
276    
277    31. Add support for GCC's visibility feature to hide internal functions.
278    
279    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
280        "unknown -C option" after outputting 0 or 1.
281    
282    33. There is now support for generating a code coverage report for the test
283        suite in environments where gcc is the compiler and lcov is installed. This
284        is mainly for the benefit of the developers.
285    
286    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
287        unaddressable using valgrind annotations, allowing valgrind to detect
288        invalid memory accesses. This is mainly for the benefit of the developers.
289    
290    25. (*UTF) can now be used to start a pattern in any of the three libraries.
291    
292    26. Give configure error if --enable-cpp but no C++ compiler found.
293    
294    
295    Version 8.31 06-July-2012
296    -------------------------
297    
298    1.  Fixing a wrong JIT test case and some compiler warnings.
299    
300    2.  Removed a bashism from the RunTest script.
301    
302    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
303        to unsigned type, result still unsigned" that was given by an MS compiler
304        on encountering the code "-sizeof(xxx)".
305    
306    4.  Partial matching support is added to the JIT compiler.
307    
308    5.  Fixed several bugs concerned with partial matching of items that consist
309        of more than one character:
310    
311        (a) /^(..)\1/ did not partially match "aba" because checking references was
312            done on an "all or nothing" basis. This also applied to repeated
313            references.
314    
315        (b) \R did not give a hard partial match if \r was found at the end of the
316            subject.
317    
318        (c) \X did not give a hard partial match after matching one or more
319            characters at the end of the subject.
320    
321        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
322            a partial match for the string "\r".
323    
324        (e) When newline was set to CRLF, the metacharacter "." did not recognize
325            a partial match for a CR character at the end of the subject string.
326    
327    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
328        running pcretest, the text "(JIT)" added to the output whenever JIT is
329        actually used to run the match.
330    
331    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
332        or /S+[+] with a digit between 1 and 7.
333    
334    8.  OP_NOT now supports any UTF character not just single-byte ones.
335    
336    9.  (*MARK) control verb is now supported by the JIT compiler.
337    
338    10. The command "./RunTest list" lists the available tests without actually
339        running any of them. (Because I keep forgetting what they all are.)
340    
341    11. Add PCRE_INFO_MAXLOOKBEHIND.
342    
343    12. Applied a (slightly modified) user-supplied patch that improves performance
344        when the heap is used for recursion (compiled with --disable-stack-for-
345        recursion). Instead of malloc and free for each heap frame each time a
346        logical recursion happens, frames are retained on a chain and re-used where
347        possible. This sometimes gives as much as 30% improvement.
348    
349    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
350        call.
351    
352    14. As documented, (*COMMIT) is now confined to within a positive assertion.
353    
354    15. It is now possible to link pcretest with libedit as an alternative to
355        libreadline.
356    
357    16. (*COMMIT) control verb is now supported by the JIT compiler.
358    
359    17. The Unicode data tables have been updated to Unicode 6.1.0.
360    
361    18. Added --file-list option to pcregrep.
362    
363    19. Added binary file support to pcregrep, including the -a, --binary-files,
364        -I, and --text options.
365    
366    20. The madvise function is renamed for posix_madvise for QNX compatibility
367        reasons. Fixed by Giuseppe D'Angelo.
368    
369    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
370    
371    22. Changed the option for creating symbolic links for 16-bit man pages from
372        -s to -sf so that re-installing does not cause issues.
373    
374    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
375    
376    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
377        matches in certain environments (the workspace was not being correctly
378        retained). Also added to pcre_dfa_exec() a simple plausibility check on
379        some of the workspace data at the beginning of a restart.
380    
381    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
382        was not doing so when it should - probably a typo introduced by SVN 528
383        (change 8.10/14).
384    
385    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
386        \w+ when the character tables indicated that \x{c4} was a word character.
387        There were several related cases, all because the tests for doing a table
388        lookup were testing for characters less than 127 instead of 255.
389    
390    27. If a pattern contains capturing parentheses that are not used in a match,
391        their slots in the ovector are set to -1. For those that are higher than
392        any matched groups, this happens at the end of processing. In the case when
393        there were back references that the ovector was too small to contain
394        (causing temporary malloc'd memory to be used during matching), and the
395        highest capturing number was not used, memory off the end of the ovector
396        was incorrectly being set to -1. (It was using the size of the temporary
397        memory instead of the true size.)
398    
399    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
400        ovector size, it uses memory at the end of the block that it has got.
401    
402    29. Check for an overlong MARK name and give an error at compile time. The
403        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
404    
405    30. JIT compiler update.
406    
407    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
408        Rill for the patch.
409    
410    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
411    
412    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
413    
414    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
415        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
416        was enabled.
417    
418    35. Improve JIT code generation for greedy plus quantifier.
419    
420    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
421        1 to "aa" instead of to an empty string. The bug affected repeated groups
422        that could potentially match an empty string.
423    
424    37. Optimizing single character iterators in JIT.
425    
426    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
427        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
428        codepoints that are too big for the mode are faulted, and in a UTF mode,
429        disallowed codepoints are also faulted.
430    
431    39. If PCRE was compiled with UTF support, in three places in the DFA
432        matcher there was code that should only have been obeyed in UTF mode, but
433        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
434        processing when bytes with values greater than 127 were present. In 16-bit
435        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
436        both cases the values are those that cannot be the first data item in a UTF
437        character. The three items that might have provoked this were recursions,
438        possessively repeated groups, and atomic groups.
439    
440    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
441        and pcregrep, because some OS require shared objects to be explicitly
442        passed to ld, causing the link step to fail if they are not.
443    
444    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
445        mode, patterns that started with \h* or \R* might be incorrectly matched.
446    
447    
448    Version 8.30 04-February-2012
449    -----------------------------
450    
451    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
452        name is defined in ctype.h.
453    
454    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
455        only in quite long subpatterns.
456    
457    3.  Removed the function pcre_info(), which has been obsolete and deprecated
458        since it was replaced by pcre_fullinfo() in February 2000.
459    
460    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
461        match a (*MARK), and the match failed at the start of the subject, a
462        reference to memory before the start of the subject could occur. This bug
463        was introduced by fix 17 of release 8.21.
464    
465    5.  A reference to an unset group with zero minimum repetition was giving
466        totally wrong answers (in non-JavaScript-compatibility mode). For example,
467        /(another)?(\1?)test/ matched against "hello world test". This bug was
468        introduced in release 8.13.
469    
470    6.  Add support for 16-bit character strings (a large amount of work involving
471        many changes and refactorings).
472    
473    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
474        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
475        from a file.
476    
477    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
478        rounding is not applied in this particular case).
479    
480    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
481        if they appear, or are escaped, in patterns.
482    
483    10. Get rid of a number of -Wunused-but-set-variable warnings.
484    
485    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
486        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
487        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
488        also returns the mark "x". This bug applied to capturing parentheses,
489        non-capturing parentheses, and atomic parentheses. It also applied to some
490        assertions.
491    
492    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
493        information out of configure.ac instead of relying on pcre.h.generic, which
494        is not stored in the repository.
495    
496    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
497        -lreadline.
498    
499    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
500    
501    15. Applied Graycode's patch to put the top-level frame on the stack rather
502        than the heap when not using the stack for recursion. This gives a
503        performance improvement in many cases when recursion is not deep.
504    
505    16. Experimental code added to "pcretest -C" to output the stack frame size.
506    
507    
508    Version 8.21 12-Dec-2011
509    ------------------------
510    
511  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
512    
# Line 13  Version 8.21 Line 517  Version 8.21
517      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
518      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
519    
520    4.  (*MARK) settings inside atomic groups that do not contain any capturing
521        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
522        was introduced by change 18 for 8.20.
523    
524    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
525        ECMA-262 standard.
526    
527    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
528        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
529        This bug was probably introduced by change 9 of 8.13.
530    
531    7.  While fixing 6 above, I noticed that a number of other items were being
532        incorrectly rejected as "not fixed length". This arose partly because newer
533        opcodes had not been added to the fixed-length checking code. I have (a)
534        corrected the bug and added tests for these items, and (b) arranged for an
535        error to occur if an unknown opcode is encountered while checking for fixed
536        length instead of just assuming "not fixed length". The items that were
537        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
538        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
539        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
540    
541    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
542        being incorrectly compiled and would have given unpredicatble results.
543    
544    9.  A possessively repeated subpattern with minimum repeat count greater than
545        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
546        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
547        the first (A) could occur when it should not.
548    
549    10. Add a cast and remove a redundant test from the code.
550    
551    11. JIT should use pcre_malloc/pcre_free for allocation.
552    
553    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
554        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
555        is anything other than /usr, -L is still shown).
556    
557    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
558    
559    14. Perl does not support \N without a following name in a [] class; PCRE now
560        also gives an error.
561    
562    15. If a forward reference was repeated with an upper limit of around 2000,
563        it caused the error "internal error: overran compiling workspace". The
564        maximum number of forward references (including repeats) was limited by the
565        internal workspace, and dependent on the LINK_SIZE. The code has been
566        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
567        the default depends on LINK_SIZE. There is a new upper limit (for safety)
568        of around 200,000 forward references. While doing this, I also speeded up
569        the filling in of repeated forward references.
570    
571    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
572        incorrectly expecting the subject to contain another "a" after the start.
573    
574    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
575        in the match, the SKIP should be ignored. This was not happening; instead
576        the SKIP was being treated as NOMATCH. For patterns such as
577        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
578        tested.
579    
580    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
581        now much more compatible with Perl, in particular in cases where the result
582        is a non-match for a non-anchored pattern. For example, if
583        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
584        "m", where previously it did not return a name. A side effect of this
585        change is that for partial matches, the last encountered mark name is
586        returned, as for non matches. A number of tests that were previously not
587        Perl-compatible have been moved into the Perl-compatible test files. The
588        refactoring has had the pleasing side effect of removing one argument from
589        the match() function, thus reducing its stack requirements.
590    
591    19. If the /S+ option was used in pcretest to study a pattern using JIT,
592        subsequent uses of /S (without +) incorrectly behaved like /S+.
593    
594    21. Retrieve executable code size support for the JIT compiler and fixing
595        some warnings.
596    
597    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
598        not work when the shorter character appeared right at the end of the
599        subject string.
600    
601    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
602        systems.
603    
604    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
605        output it when the /M option is used in pcretest.
606    
607    25. The CheckMan script was not being included in the distribution. Also, added
608        an explicit "perl" to run Perl scripts from the PrepareRelease script
609        because this is reportedly needed in Windows.
610    
611    26. If study data was being save in a file and studying had not found a set of
612        "starts with" bytes for the pattern, the data written to the file (though
613        never used) was taken from uninitialized memory and so caused valgrind to
614        complain.
615    
616    27. Updated RunTest.bat as provided by Sheri Pierce.
617    
618    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
619    
620    29. Computation of memory usage for the table of capturing group names was
621        giving an unnecessarily large value.
622    
623    
624  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
625  ------------------------  ------------------------

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