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

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