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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.32  Version 8.35-RC1 xx-xxxx-201x
5  ------------  -----------------------------
6    
7    1.  A new flag is set, when property checks are present in an XCLASS.
8        When this flag is not set, PCRE can perform certain optimizations
9        such as studying these XCLASS-es.
10    
11    2.  The auto-possessification of character sets were improved: a normal
12        and an extended character set can be compared now. Furthermore
13        the JIT compiler optimizes more character set checks.
14    
15    3.  Got rid of some compiler warnings for potentially uninitialized variables
16        that show up only when compiled with -O2.
17    
18    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
19        of a match later then the end of the match. The pcretest program was not
20        handling the case sensibly - it was outputting from the start to the next
21        binary zero. It now reports this situation in a message, and outputs the
22        text from the end to the start.
23    
24    5.  Fast forward search is improved in JIT. Instead of the first three
25        characters, any three characters with fixed position can be searched.
26        Search order: first, last, middle.
27    
28    
29    Version 8.34 15-December-2013
30    -----------------------------
31    
32    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
33        executable memory. Patch inspired by Carsten Klein.
34    
35    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
36        this macro is never tested and has no effect, because the work to support
37        coverage involves only compiling and linking options and special targets in
38        the Makefile. The comment in config.h implied that defining the macro would
39        enable coverage support, which is totally false. There was also support for
40        setting this macro in the CMake files (my fault, I just copied it from
41        configure). SUPPORT_GCOV has now been removed.
42    
43    3.  Make a small performance improvement in strlen16() and strlen32() in
44        pcretest.
45    
46    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
47        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
48        these cases). There was also one in pcretest.c.
49    
50    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
51    
52    6.  In UTF mode, the code for checking whether a group could match an empty
53        string (which is used for indefinitely repeated groups to allow for
54        breaking an infinite loop) was broken when the group contained a repeated
55        negated single-character class with a character that occupied more than one
56        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
57        UTF-8 mode). The effect was undefined: the group might or might not be
58        deemed as matching an empty string, or the program might have crashed.
59    
60    7.  The code for checking whether a group could match an empty string was not
61        recognizing that \h, \H, \v, \V, and \R must match a character.
62    
63    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
64        an empty string. If it can, pcretest shows this in its information output.
65    
66    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
67        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
68        matched by pcre_exec() without using JIT:
69    
70        (a) If the rest of the pattern did not match after a maximal run of
71            grapheme clusters, the code for backing up to try with fewer of them
72            did not always back up over a full grapheme when characters that do not
73            have the modifier quality were involved, e.g. Hangul syllables.
74    
75        (b) If the match point in a subject started with modifier character, and
76            there was no match, the code could incorrectly back up beyond the match
77            point, and potentially beyond the first character in the subject,
78            leading to a segfault or an incorrect match result.
79    
80    10. A conditional group with an assertion condition could lead to PCRE
81        recording an incorrect first data item for a match if no other first data
82        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
83        first data item, and therefore matched "ca" after "c" instead of at the
84        start.
85    
86    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
87        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
88    
89    12. The source of pcregrep now includes z/OS-specific code so that it can be
90        compiled for z/OS as part of the special z/OS distribution.
91    
92    13. Added the -T and -TM options to pcretest.
93    
94    14. The code in pcre_compile.c for creating the table of named capturing groups
95        has been refactored. Instead of creating the table dynamically during the
96        actual compiling pass, the information is remembered during the pre-compile
97        pass (on the stack unless there are more than 20 named groups, in which
98        case malloc() is used) and the whole table is created before the actual
99        compile happens. This has simplified the code (it is now nearly 150 lines
100        shorter) and prepared the way for better handling of references to groups
101        with duplicate names.
102    
103    15. A back reference to a named subpattern when there is more than one of the
104        same name now checks them in the order in which they appear in the pattern.
105        The first one that is set is used for the reference. Previously only the
106        first one was inspected. This change makes PCRE more compatible with Perl.
107    
108    16. Unicode character properties were updated from Unicode 6.3.0.
109    
110    17. The compile-time code for auto-possessification has been refactored, based
111        on a patch by Zoltan Herczeg. It now happens after instead of during
112        compilation. The code is cleaner, and more cases are handled. The option
113        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
114        options in pcretest are provided to set it. It can also be set by
115        (*NO_AUTO_POSSESS) at the start of a pattern.
116    
117    18. The character VT has been added to the default ("C" locale) set of
118        characters that match \s and are generally treated as white space,
119        following this same change in Perl 5.18. There is now no difference between
120        "Perl space" and "POSIX space". Whether VT is treated as white space in
121        other locales depends on the locale.
122    
123    19. The code for checking named groups as conditions, either for being set or
124        for being recursed, has been refactored (this is related to 14 and 15
125        above). Processing unduplicated named groups should now be as fast at
126        numerical groups, and processing duplicated groups should be faster than
127        before.
128    
129    20. Two patches to the CMake build system, by Alexander Barkov:
130    
131          (1) Replace the "source" command by "." in CMakeLists.txt because
132              "source" is a bash-ism.
133    
134          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
135              without these the CMake build does not work on Solaris.
136    
137    21. Perl has changed its handling of \8 and \9. If there is no previously
138        encountered capturing group of those numbers, they are treated as the
139        literal characters 8 and 9 instead of a binary zero followed by the
140        literals. PCRE now does the same.
141    
142    22. Following Perl, added \o{} to specify codepoints in octal, making it
143        possible to specify values greater than 0777 and also making them
144        unambiguous.
145    
146    23. Perl now gives an error for missing closing braces after \x{... instead of
147        treating the string as literal. PCRE now does the same.
148    
149    24. RunTest used to grumble if an inappropriate test was selected explicitly,
150        but just skip it when running all tests. This make it awkward to run ranges
151        of tests when one of them was inappropriate. Now it just skips any
152        inappropriate tests, as it always did when running all tests.
153    
154    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
155        character types such as \d or \w, too many callouts were inserted, and the
156        data that they returned was rubbish.
157    
158    26. In UCP mode, \s was not matching two of the characters that Perl matches,
159        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
160        were matched by \h. The code has now been refactored so that the lists of
161        the horizontal and vertical whitespace characters used for \h and \v (which
162        are defined only in one place) are now also used for \s.
163    
164    27. Add JIT support for the 64 bit TileGX architecture.
165        Patch by Jiong Wang (Tilera Corporation).
166    
167    28. Possessive quantifiers for classes (both explicit and automatically
168        generated) now use special opcodes instead of wrapping in ONCE brackets.
169    
170    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
171        (because it's meaningless), this was not happening when PCRE_CASELESS was
172        set. Not wrong, but inefficient.
173    
174    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
175        properties for \w, \d, etc) is present in a test regex. Otherwise if the
176        test contains no characters greater than 255, Perl doesn't realise it
177        should be using Unicode semantics.
178    
179    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
180        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
181        does in Unicode mode.
182    
183    32. Added the "forbid" facility to pcretest so that putting tests into the
184        wrong test files can sometimes be quickly detected.
185    
186    33. There is now a limit (default 250) on the depth of nesting of parentheses.
187        This limit is imposed to control the amount of system stack used at compile
188        time. It can be changed at build time by --with-parens-nest-limit=xxx or
189        the equivalent in CMake.
190    
191    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
192        errors. Perl warns for these when in warning mode, but PCRE has no facility
193        for giving warnings.
194    
195    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
196        However, this was not working for (?!) because it is optimized to (*FAIL),
197        for which PCRE does not allow quantifiers. The optimization is now disabled
198        when a quantifier follows (?!). I can't see any use for this, but it makes
199        things uniform.
200    
201    36. Perl no longer allows group names to start with digits, so I have made this
202        change also in PCRE. It simplifies the code a bit.
203    
204    37. In extended mode, Perl ignores spaces before a + that indicates a
205        possessive quantifier. PCRE allowed a space before the quantifier, but not
206        before the possessive +. It now does.
207    
208    38. The use of \K (reset reported match start) within a repeated possessive
209        group such as (a\Kb)*+ was not working.
210    
211    40. Document that the same character tables must be used at compile time and
212        run time, and that the facility to pass tables to pcre_exec() and
213        pcre_dfa_exec() is for use only with saved/restored patterns.
214    
215    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
216        features for Builds with MSVC:
217    
218        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
219           builds). The .rc files can be used to set FileDescription and many other
220           attributes.
221    
222        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
223           This allows higher-level build scripts which want .pdb files to avoid
224           hard-coding the exact files needed."
225    
226    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
227        mean "start of word" and "end of word", respectively, as a transition aid.
228    
229    43. A minimizing repeat of a class containing codepoints greater than 255 in
230        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
231        compiled to use the heap for recursion.
232    
233    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
234        is configured.
235    
236    
237    Version 8.33 28-May-2013
238    ------------------------
239    
240    1.  Added 'U' to some constants that are compared to unsigned integers, to
241        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
242        variables that are added to signed variables, to ensure the result is
243        signed and can be negated.
244    
245    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
246        CMake config files.
247    
248    3.  Revise the creation of config.h.generic so that all boolean macros are
249        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
250        overriding via -D on the command line possible.
251    
252    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
253        to unsigned int is reported to make a quite noticeable speed difference in
254        a specific Windows environment. Testing on Linux did also appear to show
255        some benefit (and it is clearly not harmful). Also fixed the definition of
256        Xop which should be unsigned.
257    
258    5.  Related to (4), changing the definition of the intermediate variable cc
259        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
260        improvements.
261    
262    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
263        unnecessary spaces.
264    
265    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
266        and later.
267    
268    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
269    
270    9.  Optimizing fast_forward_start_bits in JIT.
271    
272    10. Adding support for callouts in JIT, and fixing some issues revealed
273        during this work. Namely:
274    
275        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
276    
277        (b) Minimum length was not checked before the matching is started.
278    
279    11. The value of capture_last that is passed to callouts was incorrect in some
280        cases when there was a capture on one path that was subsequently abandoned
281        after a backtrack. Also, the capture_last value is now reset after a
282        recursion, since all captures are also reset in this case.
283    
284    12. The interpreter no longer returns the "too many substrings" error in the
285        case when an overflowing capture is in a branch that is subsequently
286        abandoned after a backtrack.
287    
288    13. In the pathological case when an offset vector of size 2 is used, pcretest
289        now prints out the matched string after a yield of 0 or 1.
290    
291    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
292        Only supported by the JIT compiler at the moment.
293    
294    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
295    
296    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
297        offset of the starting point of the matching process, provided the offsets
298        vector is large enough.
299    
300    17. The \A escape now records a lookbehind value of 1, though its execution
301        does not actually inspect the previous character. This is to ensure that,
302        in partial multi-segment matching, at least one character from the old
303        segment is retained when a new segment is processed. Otherwise, if there
304        are no lookbehinds in the pattern, \A might match incorrectly at the start
305        of a new segment.
306    
307    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
308    
309    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
310        gives some modest performance improvement in 8-bit mode.
311    
312    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
313        be expressed in certain programming languages using Universal Character
314        Names.
315    
316    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
317        which points out that "non characters" are not "characters that may not
318        appear in Unicode strings" but rather "characters that are reserved for
319        internal use and have only local meaning".
320    
321    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
322        there was a conditional group that depended on an assertion, if the
323        assertion was false, the callout that immediately followed the alternation
324        in the condition was skipped when pcre_exec() was used for matching.
325    
326    23. Allow an explicit callout to be inserted before an assertion that is the
327        condition for a conditional group, for compatibility with automatic
328        callouts, which always insert a callout at this point.
329    
330    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
331        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
332    
333    25. (*PRUNE) is now supported by the JIT compiler.
334    
335    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
336    
337    27. Fix the case where there are two or more SKIPs with arguments that may be
338        ignored.
339    
340    28. (*SKIP) is now supported by the JIT compiler.
341    
342    29. (*THEN) is now supported by the JIT compiler.
343    
344    30. Update RunTest with additional test selector options.
345    
346    31. The way PCRE handles backtracking verbs has been changed in two ways.
347    
348        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
349        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
350        backtracking. In some cases this makes it more Perl-compatible, but Perl's
351        rather obscure rules do not always do the same thing.
352    
353        (2) Previously, backtracking verbs were confined within assertions. This is
354        no longer the case for positive assertions, except for (*ACCEPT). Again,
355        this sometimes improves Perl compatibility, and sometimes does not.
356    
357    32. A number of tests that were in test 2 because Perl did things differently
358        have been moved to test 1, because either Perl or PCRE has changed, and
359        these tests are now compatible.
360    
361    32. Backtracking control verbs are now handled in the same way in JIT and
362        interpreter.
363    
364    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
365        contained a forward subroutine reference caused a compile error.
366    
367    34. Auto-detect and optimize limited repetitions in JIT.
368    
369    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
370        blocking (*UTF) etc.
371    
372    36. In the interpreter, maximizing pattern repetitions for characters and
373        character types now use tail recursion, which reduces stack usage.
374    
375    37. The value of the max lookbehind was not correctly preserved if a compiled
376        and saved regex was reloaded on a host of different endianness.
377    
378    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
379        of the compiled pattern block, expand the flags field from 16 to 32 bits
380        because it was almost full.
381    
382    39. Try madvise first before posix_madvise.
383    
384    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
385        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
386        original change locked out all matches of empty strings. This has been
387        changed so that one match of an empty string per line is recognized.
388        Subsequent searches on the same line (for colouring or for --only-matching,
389        for example) do not recognize empty strings.
390    
391    41. Applied a user patch to fix a number of spelling mistakes in comments.
392    
393    42. Data lines longer than 65536 caused pcretest to crash.
394    
395    43. Clarified the data type for length and startoffset arguments for pcre_exec
396        and pcre_dfa_exec in the function-specific man pages, where they were
397        explicitly stated to be in bytes, never having been updated. I also added
398        some clarification to the pcreapi man page.
399    
400    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
401        a segmentation fault.
402    
403    
404    Version 8.32 30-November-2012
405    -----------------------------
406    
407  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
408      character iterators.      character iterators.
# Line 16  Version 8.32 Line 416  Version 8.32
416    
417  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
418      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
419    
420  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
421      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
422      atomic brackets at the start of a pattern, or where there was a subsequent      atomic brackets at the start of a pattern, or where there was a subsequent
423      *PRUNE or *SKIP.      *PRUNE or *SKIP.
424    
425  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
426      Patch by Daniel Richard G.      Patch by Daniel Richard G.
427    
428  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
429      grep:      grep:
430    
431      (a) There is now no limit to the number of patterns to be matched.      (a) There is now no limit to the number of patterns to be matched.
432    
433      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
434    
435      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
436          are now supported.          are now supported.
437    
438      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
439    
440      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
441          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
442    
443      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
444    
445      (g) In a Windows environment, the default for -d has been changed from      (g) In a Windows environment, the default for -d has been changed from
446          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
447          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
448    
449      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
450    
451  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
452    
453  10. Changed the meaning of \X so that it now matches a Unicode extended  10. Changed the meaning of \X so that it now matches a Unicode extended
454      grapheme cluster.      grapheme cluster.
455    
456  11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting  11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
457      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
458    
459  12. Added support for PCRE_STUDY_EXTRA_NEEDED.  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
460    
461  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
462      structure could go wrong in environments where size_t is not the same size      structure could go wrong in environments where size_t is not the same size
463      as int.      as int.
464    
465  14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be  14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
466      set.      set.
467    
468  15. The EBCDIC support had decayed; later updates to the code had included  15. The EBCDIC support had decayed; later updates to the code had included
469      explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a      explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
470      general tidy up of EBCDIC-related issues, and the documentation was also      general tidy up of EBCDIC-related issues, and the documentation was also
471      not quite right. There is now a test that can be run on ASCII systems to      not quite right. There is now a test that can be run on ASCII systems to
472      check some of the EBCDIC-related things (but is it not a full test).      check some of the EBCDIC-related things (but is it not a full test).
473    
474    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
475        in a small tidy to the code.
476    
477    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
478    
479    18. If the --only-matching (-o) option in pcregrep is specified multiple
480        times, each one causes appropriate output. For example, -o1 -o2 outputs the
481        substrings matched by the 1st and 2nd capturing parentheses. A separating
482        string can be specified by --om-separator (default empty).
483    
484    19. Improving the first n character searches.
485    
486    20. Turn case lists for horizontal and vertical white space into macros so that
487        they are defined only once.
488    
489    21. This set of changes together give more compatible Unicode case-folding
490        behaviour for characters that have more than one other case when UCP
491        support is available.
492    
493        (a) The Unicode property table now has offsets into a new table of sets of
494            three or more characters that are case-equivalent. The MultiStage2.py
495            script that generates these tables (the pcre_ucd.c file) now scans
496            CaseFolding.txt instead of UnicodeData.txt for character case
497            information.
498    
499        (b) The code for adding characters or ranges of characters to a character
500            class has been abstracted into a generalized function that also handles
501            case-independence. In UTF-mode with UCP support, this uses the new data
502            to handle characters with more than one other case.
503    
504        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
505            whose other case is greater than 256 are now correctly matched
506            caselessly. Previously, the high codepoint matched the low one, but not
507            vice versa.
508    
509        (d) The processing of \h, \H, \v, and \ in character classes now makes use
510            of the new class addition function, using character lists defined as
511            macros alongside the case definitions of 20 above.
512    
513        (e) Caseless back references now work with characters that have more than
514            one other case.
515    
516        (f) General caseless matching of characters with more than one other case
517            is supported.
518    
519    22. Unicode character properties were updated from Unicode 6.2.0
520    
521    23. Improved CMake support under Windows. Patch by Daniel Richard G.
522    
523    24. Add support for 32-bit character strings, and UTF-32
524    
525    25. Major JIT compiler update (code refactoring and bugfixing).
526        Experimental Sparc 32 support is added.
527    
528    26. Applied a modified version of Daniel Richard G's patch to create
529        pcre.h.generic and config.h.generic by "make" instead of in the
530        PrepareRelease script.
531    
532    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
533        pcre_compile.c when checking for a zero character.
534    
535    28. Introducing a native interface for JIT. Through this interface, the compiled
536        machine code can be directly executed. The purpose of this interface is to
537        provide fast pattern matching, so several sanity checks are not performed.
538        However, feature tests are still performed. The new interface provides
539        1.4x speedup compared to the old one.
540    
541    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
542        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
543        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
544    
545    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
546        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
547        the "old" RFC 2279). Instead, it ended up passing a negative length to
548        pcre_exec().
549    
550    31. Add support for GCC's visibility feature to hide internal functions.
551    
552    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
553        "unknown -C option" after outputting 0 or 1.
554    
555    33. There is now support for generating a code coverage report for the test
556        suite in environments where gcc is the compiler and lcov is installed. This
557        is mainly for the benefit of the developers.
558    
559    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
560        unaddressable using valgrind annotations, allowing valgrind to detect
561        invalid memory accesses. This is mainly for the benefit of the developers.
562    
563    25. (*UTF) can now be used to start a pattern in any of the three libraries.
564    
565    26. Give configure error if --enable-cpp but no C++ compiler found.
566    
567    
568  Version 8.31 06-July-2012  Version 8.31 06-July-2012
# Line 1416  Version 7.9 11-Apr-09 Line 1908  Version 7.9 11-Apr-09
1908  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1909      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1910      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1911      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1912        8.33.]
1913    
1914  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1915      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1659  Version 7.7 07-May-08 Line 2152  Version 7.7 07-May-08
2152      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2153      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2154      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2155      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2156      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2157      was subsequently set up correctly.)      was subsequently set up correctly.)
2158    

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