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revision 742 by zherczeg, Sun Nov 6 08:05:33 2011 UTC revision 1305 by ph10, Mon Apr 1 14:50:45 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    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
131        contained a forward subroutine reference caused a compile error.
132    
133    
134    Version 8.32 30-November-2012
135    -----------------------------
136    
137    1.  Improved JIT compiler optimizations for first character search and single
138        character iterators.
139    
140    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
141        Patch by Daniel Richard G.
142    
143    3.  Single character iterator optimizations in the JIT compiler.
144    
145    4.  Improved JIT compiler optimizations for character ranges.
146    
147    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
148        Reported by Giuseppe D'Angelo.
149    
150    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
151        of a line, was being set incorrectly in cases where .* appeared inside
152        atomic brackets at the start of a pattern, or where there was a subsequent
153        *PRUNE or *SKIP.
154    
155    7.  Improved instruction cache flush for POWER/PowerPC.
156        Patch by Daniel Richard G.
157    
158    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
159        grep:
160    
161        (a) There is now no limit to the number of patterns to be matched.
162    
163        (b) An error is given if a pattern is too long.
164    
165        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
166            are now supported.
167    
168        (d) --exclude-from and --include-from (multiple use) have been added.
169    
170        (e) Exclusions and inclusions now apply to all files and directories, not
171            just to those obtained from scanning a directory recursively.
172    
173        (f) Multiple uses of -f and --file-list are now supported.
174    
175        (g) In a Windows environment, the default for -d has been changed from
176            "read" (the GNU grep default) to "skip", because otherwise the presence
177            of a directory in the file list provokes an error.
178    
179        (h) The documentation has been revised and clarified in places.
180    
181    9.  Improve the matching speed of capturing brackets.
182    
183    10. Changed the meaning of \X so that it now matches a Unicode extended
184        grapheme cluster.
185    
186    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
187        out POSIX threads when JIT support is configured.
188    
189    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
190    
191    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
192        structure could go wrong in environments where size_t is not the same size
193        as int.
194    
195    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
196        set.
197    
198    15. The EBCDIC support had decayed; later updates to the code had included
199        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
200        general tidy up of EBCDIC-related issues, and the documentation was also
201        not quite right. There is now a test that can be run on ASCII systems to
202        check some of the EBCDIC-related things (but is it not a full test).
203    
204    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
205        in a small tidy to the code.
206    
207    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
208    
209    18. If the --only-matching (-o) option in pcregrep is specified multiple
210        times, each one causes appropriate output. For example, -o1 -o2 outputs the
211        substrings matched by the 1st and 2nd capturing parentheses. A separating
212        string can be specified by --om-separator (default empty).
213    
214    19. Improving the first n character searches.
215    
216    20. Turn case lists for horizontal and vertical white space into macros so that
217        they are defined only once.
218    
219    21. This set of changes together give more compatible Unicode case-folding
220        behaviour for characters that have more than one other case when UCP
221        support is available.
222    
223        (a) The Unicode property table now has offsets into a new table of sets of
224            three or more characters that are case-equivalent. The MultiStage2.py
225            script that generates these tables (the pcre_ucd.c file) now scans
226            CaseFolding.txt instead of UnicodeData.txt for character case
227            information.
228    
229        (b) The code for adding characters or ranges of characters to a character
230            class has been abstracted into a generalized function that also handles
231            case-independence. In UTF-mode with UCP support, this uses the new data
232            to handle characters with more than one other case.
233    
234        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
235            whose other case is greater than 256 are now correctly matched
236            caselessly. Previously, the high codepoint matched the low one, but not
237            vice versa.
238    
239        (d) The processing of \h, \H, \v, and \ in character classes now makes use
240            of the new class addition function, using character lists defined as
241            macros alongside the case definitions of 20 above.
242    
243        (e) Caseless back references now work with characters that have more than
244            one other case.
245    
246        (f) General caseless matching of characters with more than one other case
247            is supported.
248    
249    22. Unicode character properties were updated from Unicode 6.2.0
250    
251    23. Improved CMake support under Windows. Patch by Daniel Richard G.
252    
253    24. Add support for 32-bit character strings, and UTF-32
254    
255    25. Major JIT compiler update (code refactoring and bugfixing).
256        Experimental Sparc 32 support is added.
257    
258    26. Applied a modified version of Daniel Richard G's patch to create
259        pcre.h.generic and config.h.generic by "make" instead of in the
260        PrepareRelease script.
261    
262    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
263        pcre_compile.c when checking for a zero character.
264    
265    28. Introducing a native interface for JIT. Through this interface, the compiled
266        machine code can be directly executed. The purpose of this interface is to
267        provide fast pattern matching, so several sanity checks are not performed.
268        However, feature tests are still performed. The new interface provides
269        1.4x speedup compared to the old one.
270    
271    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
272        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
273        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
274    
275    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
276        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
277        the "old" RFC 2279). Instead, it ended up passing a negative length to
278        pcre_exec().
279    
280    31. Add support for GCC's visibility feature to hide internal functions.
281    
282    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
283        "unknown -C option" after outputting 0 or 1.
284    
285    33. There is now support for generating a code coverage report for the test
286        suite in environments where gcc is the compiler and lcov is installed. This
287        is mainly for the benefit of the developers.
288    
289    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
290        unaddressable using valgrind annotations, allowing valgrind to detect
291        invalid memory accesses. This is mainly for the benefit of the developers.
292    
293    25. (*UTF) can now be used to start a pattern in any of the three libraries.
294    
295    26. Give configure error if --enable-cpp but no C++ compiler found.
296    
297    
298    Version 8.31 06-July-2012
299    -------------------------
300    
301    1.  Fixing a wrong JIT test case and some compiler warnings.
302    
303    2.  Removed a bashism from the RunTest script.
304    
305    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
306        to unsigned type, result still unsigned" that was given by an MS compiler
307        on encountering the code "-sizeof(xxx)".
308    
309    4.  Partial matching support is added to the JIT compiler.
310    
311    5.  Fixed several bugs concerned with partial matching of items that consist
312        of more than one character:
313    
314        (a) /^(..)\1/ did not partially match "aba" because checking references was
315            done on an "all or nothing" basis. This also applied to repeated
316            references.
317    
318        (b) \R did not give a hard partial match if \r was found at the end of the
319            subject.
320    
321        (c) \X did not give a hard partial match after matching one or more
322            characters at the end of the subject.
323    
324        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
325            a partial match for the string "\r".
326    
327        (e) When newline was set to CRLF, the metacharacter "." did not recognize
328            a partial match for a CR character at the end of the subject string.
329    
330    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
331        running pcretest, the text "(JIT)" added to the output whenever JIT is
332        actually used to run the match.
333    
334    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
335        or /S+[+] with a digit between 1 and 7.
336    
337    8.  OP_NOT now supports any UTF character not just single-byte ones.
338    
339    9.  (*MARK) control verb is now supported by the JIT compiler.
340    
341    10. The command "./RunTest list" lists the available tests without actually
342        running any of them. (Because I keep forgetting what they all are.)
343    
344    11. Add PCRE_INFO_MAXLOOKBEHIND.
345    
346    12. Applied a (slightly modified) user-supplied patch that improves performance
347        when the heap is used for recursion (compiled with --disable-stack-for-
348        recursion). Instead of malloc and free for each heap frame each time a
349        logical recursion happens, frames are retained on a chain and re-used where
350        possible. This sometimes gives as much as 30% improvement.
351    
352    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
353        call.
354    
355    14. As documented, (*COMMIT) is now confined to within a positive assertion.
356    
357    15. It is now possible to link pcretest with libedit as an alternative to
358        libreadline.
359    
360    16. (*COMMIT) control verb is now supported by the JIT compiler.
361    
362    17. The Unicode data tables have been updated to Unicode 6.1.0.
363    
364    18. Added --file-list option to pcregrep.
365    
366    19. Added binary file support to pcregrep, including the -a, --binary-files,
367        -I, and --text options.
368    
369    20. The madvise function is renamed for posix_madvise for QNX compatibility
370        reasons. Fixed by Giuseppe D'Angelo.
371    
372    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
373    
374    22. Changed the option for creating symbolic links for 16-bit man pages from
375        -s to -sf so that re-installing does not cause issues.
376    
377    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
378    
379    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
380        matches in certain environments (the workspace was not being correctly
381        retained). Also added to pcre_dfa_exec() a simple plausibility check on
382        some of the workspace data at the beginning of a restart.
383    
384    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
385        was not doing so when it should - probably a typo introduced by SVN 528
386        (change 8.10/14).
387    
388    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
389        \w+ when the character tables indicated that \x{c4} was a word character.
390        There were several related cases, all because the tests for doing a table
391        lookup were testing for characters less than 127 instead of 255.
392    
393    27. If a pattern contains capturing parentheses that are not used in a match,
394        their slots in the ovector are set to -1. For those that are higher than
395        any matched groups, this happens at the end of processing. In the case when
396        there were back references that the ovector was too small to contain
397        (causing temporary malloc'd memory to be used during matching), and the
398        highest capturing number was not used, memory off the end of the ovector
399        was incorrectly being set to -1. (It was using the size of the temporary
400        memory instead of the true size.)
401    
402    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
403        ovector size, it uses memory at the end of the block that it has got.
404    
405    29. Check for an overlong MARK name and give an error at compile time. The
406        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
407    
408    30. JIT compiler update.
409    
410    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
411        Rill for the patch.
412    
413    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
414    
415    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
416    
417    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
418        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
419        was enabled.
420    
421    35. Improve JIT code generation for greedy plus quantifier.
422    
423    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
424        1 to "aa" instead of to an empty string. The bug affected repeated groups
425        that could potentially match an empty string.
426    
427    37. Optimizing single character iterators in JIT.
428    
429    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
430        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
431        codepoints that are too big for the mode are faulted, and in a UTF mode,
432        disallowed codepoints are also faulted.
433    
434    39. If PCRE was compiled with UTF support, in three places in the DFA
435        matcher there was code that should only have been obeyed in UTF mode, but
436        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
437        processing when bytes with values greater than 127 were present. In 16-bit
438        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
439        both cases the values are those that cannot be the first data item in a UTF
440        character. The three items that might have provoked this were recursions,
441        possessively repeated groups, and atomic groups.
442    
443    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
444        and pcregrep, because some OS require shared objects to be explicitly
445        passed to ld, causing the link step to fail if they are not.
446    
447    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
448        mode, patterns that started with \h* or \R* might be incorrectly matched.
449    
450    
451    Version 8.30 04-February-2012
452    -----------------------------
453    
454    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
455        name is defined in ctype.h.
456    
457    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
458        only in quite long subpatterns.
459    
460    3.  Removed the function pcre_info(), which has been obsolete and deprecated
461        since it was replaced by pcre_fullinfo() in February 2000.
462    
463    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
464        match a (*MARK), and the match failed at the start of the subject, a
465        reference to memory before the start of the subject could occur. This bug
466        was introduced by fix 17 of release 8.21.
467    
468    5.  A reference to an unset group with zero minimum repetition was giving
469        totally wrong answers (in non-JavaScript-compatibility mode). For example,
470        /(another)?(\1?)test/ matched against "hello world test". This bug was
471        introduced in release 8.13.
472    
473    6.  Add support for 16-bit character strings (a large amount of work involving
474        many changes and refactorings).
475    
476    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
477        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
478        from a file.
479    
480    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
481        rounding is not applied in this particular case).
482    
483    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
484        if they appear, or are escaped, in patterns.
485    
486    10. Get rid of a number of -Wunused-but-set-variable warnings.
487    
488    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
489        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
490        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
491        also returns the mark "x". This bug applied to capturing parentheses,
492        non-capturing parentheses, and atomic parentheses. It also applied to some
493        assertions.
494    
495    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
496        information out of configure.ac instead of relying on pcre.h.generic, which
497        is not stored in the repository.
498    
499    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
500        -lreadline.
501    
502    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
503    
504    15. Applied Graycode's patch to put the top-level frame on the stack rather
505        than the heap when not using the stack for recursion. This gives a
506        performance improvement in many cases when recursion is not deep.
507    
508    16. Experimental code added to "pcretest -C" to output the stack frame size.
509    
510    
511    Version 8.21 12-Dec-2011
512    ------------------------
513    
514  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
515    
# Line 13  Version 8.21 Line 520  Version 8.21
520      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
521      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
522    
523    4.  (*MARK) settings inside atomic groups that do not contain any capturing
524        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
525        was introduced by change 18 for 8.20.
526    
527    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
528        ECMA-262 standard.
529    
530    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
531        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
532        This bug was probably introduced by change 9 of 8.13.
533    
534    7.  While fixing 6 above, I noticed that a number of other items were being
535        incorrectly rejected as "not fixed length". This arose partly because newer
536        opcodes had not been added to the fixed-length checking code. I have (a)
537        corrected the bug and added tests for these items, and (b) arranged for an
538        error to occur if an unknown opcode is encountered while checking for fixed
539        length instead of just assuming "not fixed length". The items that were
540        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
541        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
542        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
543    
544    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
545        being incorrectly compiled and would have given unpredicatble results.
546    
547    9.  A possessively repeated subpattern with minimum repeat count greater than
548        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
549        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
550        the first (A) could occur when it should not.
551    
552    10. Add a cast and remove a redundant test from the code.
553    
554    11. JIT should use pcre_malloc/pcre_free for allocation.
555    
556    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
557        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
558        is anything other than /usr, -L is still shown).
559    
560    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
561    
562    14. Perl does not support \N without a following name in a [] class; PCRE now
563        also gives an error.
564    
565    15. If a forward reference was repeated with an upper limit of around 2000,
566        it caused the error "internal error: overran compiling workspace". The
567        maximum number of forward references (including repeats) was limited by the
568        internal workspace, and dependent on the LINK_SIZE. The code has been
569        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
570        the default depends on LINK_SIZE. There is a new upper limit (for safety)
571        of around 200,000 forward references. While doing this, I also speeded up
572        the filling in of repeated forward references.
573    
574    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
575        incorrectly expecting the subject to contain another "a" after the start.
576    
577    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
578        in the match, the SKIP should be ignored. This was not happening; instead
579        the SKIP was being treated as NOMATCH. For patterns such as
580        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
581        tested.
582    
583    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
584        now much more compatible with Perl, in particular in cases where the result
585        is a non-match for a non-anchored pattern. For example, if
586        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
587        "m", where previously it did not return a name. A side effect of this
588        change is that for partial matches, the last encountered mark name is
589        returned, as for non matches. A number of tests that were previously not
590        Perl-compatible have been moved into the Perl-compatible test files. The
591        refactoring has had the pleasing side effect of removing one argument from
592        the match() function, thus reducing its stack requirements.
593    
594    19. If the /S+ option was used in pcretest to study a pattern using JIT,
595        subsequent uses of /S (without +) incorrectly behaved like /S+.
596    
597    21. Retrieve executable code size support for the JIT compiler and fixing
598        some warnings.
599    
600    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
601        not work when the shorter character appeared right at the end of the
602        subject string.
603    
604    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
605        systems.
606    
607    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
608        output it when the /M option is used in pcretest.
609    
610    25. The CheckMan script was not being included in the distribution. Also, added
611        an explicit "perl" to run Perl scripts from the PrepareRelease script
612        because this is reportedly needed in Windows.
613    
614    26. If study data was being save in a file and studying had not found a set of
615        "starts with" bytes for the pattern, the data written to the file (though
616        never used) was taken from uninitialized memory and so caused valgrind to
617        complain.
618    
619    27. Updated RunTest.bat as provided by Sheri Pierce.
620    
621    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
622    
623    29. Computation of memory usage for the table of capturing group names was
624        giving an unnecessarily large value.
625    
626    
627  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
628  ------------------------  ------------------------

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