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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    
33    Version 8.32 30-November-2012
34    -----------------------------
35    
36    1.  Improved JIT compiler optimizations for first character search and single
37        character iterators.
38    
39    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
40        Patch by Daniel Richard G.
41    
42    3.  Single character iterator optimizations in the JIT compiler.
43    
44    4.  Improved JIT compiler optimizations for character ranges.
45    
46    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
47        Reported by Giuseppe D'Angelo.
48    
49    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
50        of a line, was being set incorrectly in cases where .* appeared inside
51        atomic brackets at the start of a pattern, or where there was a subsequent
52        *PRUNE or *SKIP.
53    
54    7.  Improved instruction cache flush for POWER/PowerPC.
55        Patch by Daniel Richard G.
56    
57    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
58        grep:
59    
60        (a) There is now no limit to the number of patterns to be matched.
61    
62        (b) An error is given if a pattern is too long.
63    
64        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
65            are now supported.
66    
67        (d) --exclude-from and --include-from (multiple use) have been added.
68    
69        (e) Exclusions and inclusions now apply to all files and directories, not
70            just to those obtained from scanning a directory recursively.
71    
72        (f) Multiple uses of -f and --file-list are now supported.
73    
74        (g) In a Windows environment, the default for -d has been changed from
75            "read" (the GNU grep default) to "skip", because otherwise the presence
76            of a directory in the file list provokes an error.
77    
78        (h) The documentation has been revised and clarified in places.
79    
80    9.  Improve the matching speed of capturing brackets.
81    
82    10. Changed the meaning of \X so that it now matches a Unicode extended
83        grapheme cluster.
84    
85    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
86        out POSIX threads when JIT support is configured.
87    
88    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
89    
90    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
91        structure could go wrong in environments where size_t is not the same size
92        as int.
93    
94    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
95        set.
96    
97    15. The EBCDIC support had decayed; later updates to the code had included
98        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
99        general tidy up of EBCDIC-related issues, and the documentation was also
100        not quite right. There is now a test that can be run on ASCII systems to
101        check some of the EBCDIC-related things (but is it not a full test).
102    
103    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
104        in a small tidy to the code.
105    
106    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
107    
108    18. If the --only-matching (-o) option in pcregrep is specified multiple
109        times, each one causes appropriate output. For example, -o1 -o2 outputs the
110        substrings matched by the 1st and 2nd capturing parentheses. A separating
111        string can be specified by --om-separator (default empty).
112    
113    19. Improving the first n character searches.
114    
115    20. Turn case lists for horizontal and vertical white space into macros so that
116        they are defined only once.
117    
118    21. This set of changes together give more compatible Unicode case-folding
119        behaviour for characters that have more than one other case when UCP
120        support is available.
121    
122        (a) The Unicode property table now has offsets into a new table of sets of
123            three or more characters that are case-equivalent. The MultiStage2.py
124            script that generates these tables (the pcre_ucd.c file) now scans
125            CaseFolding.txt instead of UnicodeData.txt for character case
126            information.
127    
128        (b) The code for adding characters or ranges of characters to a character
129            class has been abstracted into a generalized function that also handles
130            case-independence. In UTF-mode with UCP support, this uses the new data
131            to handle characters with more than one other case.
132    
133        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
134            whose other case is greater than 256 are now correctly matched
135            caselessly. Previously, the high codepoint matched the low one, but not
136            vice versa.
137    
138        (d) The processing of \h, \H, \v, and \ in character classes now makes use
139            of the new class addition function, using character lists defined as
140            macros alongside the case definitions of 20 above.
141    
142        (e) Caseless back references now work with characters that have more than
143            one other case.
144    
145        (f) General caseless matching of characters with more than one other case
146            is supported.
147    
148    22. Unicode character properties were updated from Unicode 6.2.0
149    
150    23. Improved CMake support under Windows. Patch by Daniel Richard G.
151    
152    24. Add support for 32-bit character strings, and UTF-32
153    
154    25. Major JIT compiler update (code refactoring and bugfixing).
155        Experimental Sparc 32 support is added.
156    
157    26. Applied a modified version of Daniel Richard G's patch to create
158        pcre.h.generic and config.h.generic by "make" instead of in the
159        PrepareRelease script.
160    
161    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
162        pcre_compile.c when checking for a zero character.
163    
164    28. Introducing a native interface for JIT. Through this interface, the compiled
165        machine code can be directly executed. The purpose of this interface is to
166        provide fast pattern matching, so several sanity checks are not performed.
167        However, feature tests are still performed. The new interface provides
168        1.4x speedup compared to the old one.
169    
170    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
171        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
172        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
173    
174    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
175        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
176        the "old" RFC 2279). Instead, it ended up passing a negative length to
177        pcre_exec().
178    
179    31. Add support for GCC's visibility feature to hide internal functions.
180    
181    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
182        "unknown -C option" after outputting 0 or 1.
183    
184    33. There is now support for generating a code coverage report for the test
185        suite in environments where gcc is the compiler and lcov is installed. This
186        is mainly for the benefit of the developers.
187    
188    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
189        unaddressable using valgrind annotations, allowing valgrind to detect
190        invalid memory accesses. This is mainly for the benefit of the developers.
191    
192    25. (*UTF) can now be used to start a pattern in any of the three libraries.
193    
194    26. Give configure error if --enable-cpp but no C++ compiler found.
195    
196    
197    Version 8.31 06-July-2012
198    -------------------------
199    
200    1.  Fixing a wrong JIT test case and some compiler warnings.
201    
202    2.  Removed a bashism from the RunTest script.
203    
204    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
205        to unsigned type, result still unsigned" that was given by an MS compiler
206        on encountering the code "-sizeof(xxx)".
207    
208    4.  Partial matching support is added to the JIT compiler.
209    
210    5.  Fixed several bugs concerned with partial matching of items that consist
211        of more than one character:
212    
213        (a) /^(..)\1/ did not partially match "aba" because checking references was
214            done on an "all or nothing" basis. This also applied to repeated
215            references.
216    
217        (b) \R did not give a hard partial match if \r was found at the end of the
218            subject.
219    
220        (c) \X did not give a hard partial match after matching one or more
221            characters at the end of the subject.
222    
223        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
224            a partial match for the string "\r".
225    
226        (e) When newline was set to CRLF, the metacharacter "." did not recognize
227            a partial match for a CR character at the end of the subject string.
228    
229    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
230        running pcretest, the text "(JIT)" added to the output whenever JIT is
231        actually used to run the match.
232    
233    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
234        or /S+[+] with a digit between 1 and 7.
235    
236    8.  OP_NOT now supports any UTF character not just single-byte ones.
237    
238    9.  (*MARK) control verb is now supported by the JIT compiler.
239    
240    10. The command "./RunTest list" lists the available tests without actually
241        running any of them. (Because I keep forgetting what they all are.)
242    
243    11. Add PCRE_INFO_MAXLOOKBEHIND.
244    
245    12. Applied a (slightly modified) user-supplied patch that improves performance
246        when the heap is used for recursion (compiled with --disable-stack-for-
247        recursion). Instead of malloc and free for each heap frame each time a
248        logical recursion happens, frames are retained on a chain and re-used where
249        possible. This sometimes gives as much as 30% improvement.
250    
251    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
252        call.
253    
254    14. As documented, (*COMMIT) is now confined to within a positive assertion.
255    
256    15. It is now possible to link pcretest with libedit as an alternative to
257        libreadline.
258    
259    16. (*COMMIT) control verb is now supported by the JIT compiler.
260    
261    17. The Unicode data tables have been updated to Unicode 6.1.0.
262    
263    18. Added --file-list option to pcregrep.
264    
265    19. Added binary file support to pcregrep, including the -a, --binary-files,
266        -I, and --text options.
267    
268    20. The madvise function is renamed for posix_madvise for QNX compatibility
269        reasons. Fixed by Giuseppe D'Angelo.
270    
271    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
272    
273    22. Changed the option for creating symbolic links for 16-bit man pages from
274        -s to -sf so that re-installing does not cause issues.
275    
276    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
277    
278    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
279        matches in certain environments (the workspace was not being correctly
280        retained). Also added to pcre_dfa_exec() a simple plausibility check on
281        some of the workspace data at the beginning of a restart.
282    
283    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
284        was not doing so when it should - probably a typo introduced by SVN 528
285        (change 8.10/14).
286    
287    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
288        \w+ when the character tables indicated that \x{c4} was a word character.
289        There were several related cases, all because the tests for doing a table
290        lookup were testing for characters less than 127 instead of 255.
291    
292    27. If a pattern contains capturing parentheses that are not used in a match,
293        their slots in the ovector are set to -1. For those that are higher than
294        any matched groups, this happens at the end of processing. In the case when
295        there were back references that the ovector was too small to contain
296        (causing temporary malloc'd memory to be used during matching), and the
297        highest capturing number was not used, memory off the end of the ovector
298        was incorrectly being set to -1. (It was using the size of the temporary
299        memory instead of the true size.)
300    
301    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
302        ovector size, it uses memory at the end of the block that it has got.
303    
304    29. Check for an overlong MARK name and give an error at compile time. The
305        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
306    
307    30. JIT compiler update.
308    
309    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
310        Rill for the patch.
311    
312    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
313    
314    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
315    
316    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
317        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
318        was enabled.
319    
320    35. Improve JIT code generation for greedy plus quantifier.
321    
322    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
323        1 to "aa" instead of to an empty string. The bug affected repeated groups
324        that could potentially match an empty string.
325    
326    37. Optimizing single character iterators in JIT.
327    
328    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
329        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
330        codepoints that are too big for the mode are faulted, and in a UTF mode,
331        disallowed codepoints are also faulted.
332    
333    39. If PCRE was compiled with UTF support, in three places in the DFA
334        matcher there was code that should only have been obeyed in UTF mode, but
335        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
336        processing when bytes with values greater than 127 were present. In 16-bit
337        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
338        both cases the values are those that cannot be the first data item in a UTF
339        character. The three items that might have provoked this were recursions,
340        possessively repeated groups, and atomic groups.
341    
342    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
343        and pcregrep, because some OS require shared objects to be explicitly
344        passed to ld, causing the link step to fail if they are not.
345    
346    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
347        mode, patterns that started with \h* or \R* might be incorrectly matched.
348    
349    
350    Version 8.30 04-February-2012
351    -----------------------------
352    
353    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
354        name is defined in ctype.h.
355    
356    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
357        only in quite long subpatterns.
358    
359    3.  Removed the function pcre_info(), which has been obsolete and deprecated
360        since it was replaced by pcre_fullinfo() in February 2000.
361    
362    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
363        match a (*MARK), and the match failed at the start of the subject, a
364        reference to memory before the start of the subject could occur. This bug
365        was introduced by fix 17 of release 8.21.
366    
367    5.  A reference to an unset group with zero minimum repetition was giving
368        totally wrong answers (in non-JavaScript-compatibility mode). For example,
369        /(another)?(\1?)test/ matched against "hello world test". This bug was
370        introduced in release 8.13.
371    
372    6.  Add support for 16-bit character strings (a large amount of work involving
373        many changes and refactorings).
374    
375    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
376        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
377        from a file.
378    
379    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
380        rounding is not applied in this particular case).
381    
382    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
383        if they appear, or are escaped, in patterns.
384    
385    10. Get rid of a number of -Wunused-but-set-variable warnings.
386    
387    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
388        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
389        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
390        also returns the mark "x". This bug applied to capturing parentheses,
391        non-capturing parentheses, and atomic parentheses. It also applied to some
392        assertions.
393    
394    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
395        information out of configure.ac instead of relying on pcre.h.generic, which
396        is not stored in the repository.
397    
398    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
399        -lreadline.
400    
401    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
402    
403    15. Applied Graycode's patch to put the top-level frame on the stack rather
404        than the heap when not using the stack for recursion. This gives a
405        performance improvement in many cases when recursion is not deep.
406    
407    16. Experimental code added to "pcretest -C" to output the stack frame size.
408    
409    
410    Version 8.21 12-Dec-2011
411    ------------------------
412    
413  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
414    
# Line 13  Version 8.21 Line 419  Version 8.21
419      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
420      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
421    
422  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
423      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
424      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
425    
# Line 22  Version 8.21 Line 428  Version 8.21
428    
429  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
430      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
431      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
432    
433  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
434      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
435      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)
436      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
437      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
438      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
439      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
440      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
441      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
442    
443  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
444      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
445    
446  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
447      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
448      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
449      the first (A) could occur when it should not.      the first (A) could occur when it should not.
450    
451  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
452    
453  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
454    
455  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
456      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
457      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
458    
459  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
460    
461  14. Perl does not support \N without a following name in a [] class; PCRE now  14. Perl does not support \N without a following name in a [] class; PCRE now
462      also gives an error.      also gives an error.
463    
464  15. If a forward reference was repeated with an upper limit of around 2000,  15. If a forward reference was repeated with an upper limit of around 2000,
465      it caused the error "internal error: overran compiling workspace". The      it caused the error "internal error: overran compiling workspace". The
466      maximum number of forward references (including repeats) was limited by the      maximum number of forward references (including repeats) was limited by the
467      internal workspace, and dependent on the LINK_SIZE. The code has been      internal workspace, and dependent on the LINK_SIZE. The code has been
468      rewritten so that the workspace expands (via pcre_malloc) if necessary, and      rewritten so that the workspace expands (via pcre_malloc) if necessary, and
469      the default depends on LINK_SIZE. There is a new upper limit (for safety)      the default depends on LINK_SIZE. There is a new upper limit (for safety)
470      of around 200,000 forward references. While doing this, I also speeded up      of around 200,000 forward references. While doing this, I also speeded up
471      the filling in of repeated forward references.      the filling in of repeated forward references.
472    
473  16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was  16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
474      incorrectly expecting the subject to contain another "a" after the start.      incorrectly expecting the subject to contain another "a" after the start.
475    
476  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
477      in the match, the SKIP should be ignored. This was not happening; instead      in the match, the SKIP should be ignored. This was not happening; instead
478      the SKIP was being treated as NOMATCH. For patterns such as      the SKIP was being treated as NOMATCH. For patterns such as
479      /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never      /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
480      tested.      tested.
481    
482  18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is  18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
483      now much more compatible with Perl, in particular in cases where the result      now much more compatible with Perl, in particular in cases where the result
484      is a non-match for a non-anchored pattern. For example, if      is a non-match for a non-anchored pattern. For example, if
485      /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name      /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
486      "m", where previously it did not return a name. A side effect of this      "m", where previously it did not return a name. A side effect of this
487      change is that for partial matches, the last encountered mark name is      change is that for partial matches, the last encountered mark name is
488      returned, as for non matches. A number of tests that were previously not      returned, as for non matches. A number of tests that were previously not
489      Perl-compatible have been moved into the Perl-compatible test files. The      Perl-compatible have been moved into the Perl-compatible test files. The
490      refactoring has had the pleasing side effect of removing one argument from      refactoring has had the pleasing side effect of removing one argument from
491      the match() function, thus reducing its stack requirements.      the match() function, thus reducing its stack requirements.
492    
493  19. If the /S+ option was used in pcretest to study a pattern using JIT,  19. If the /S+ option was used in pcretest to study a pattern using JIT,
494      subsequent uses of /S (without +) incorrectly behaved like /S+.      subsequent uses of /S (without +) incorrectly behaved like /S+.
495    
496  21. Retrieve executable code size support for the JIT compiler and fixing  21. Retrieve executable code size support for the JIT compiler and fixing
497      some warnings.      some warnings.
498    
499  22. A caseless match of a UTF-8 character whose other case uses fewer bytes did  22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
500      not work when the shorter character appeared right at the end of the      not work when the shorter character appeared right at the end of the
501      subject string.      subject string.
502    
503  23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit  23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
504      systems.      systems.
505    
506  24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also  24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
507      output it when the /M option is used in pcretest.      output it when the /M option is used in pcretest.
508    
509    25. The CheckMan script was not being included in the distribution. Also, added
510        an explicit "perl" to run Perl scripts from the PrepareRelease script
511        because this is reportedly needed in Windows.
512    
513    26. If study data was being save in a file and studying had not found a set of
514        "starts with" bytes for the pattern, the data written to the file (though
515        never used) was taken from uninitialized memory and so caused valgrind to
516        complain.
517    
518    27. Updated RunTest.bat as provided by Sheri Pierce.
519    
520    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
521    
522    29. Computation of memory usage for the table of capturing group names was
523        giving an unnecessarily large value.
524    
525    
526  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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