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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 1490 by chpe, Thu Jun 19 07:51:39 2014 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  Version 8.36 xx-xxx-2014
5  ------------  ------------------------
7    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
8        -Wmissing-field-initializers and -Wunused-parameter.
10    2.  The tests for quantifiers being too big (greater than 65535) were being
11        applied after reading the number, and stupidly assuming that integer
12        overflow would give a negative number. The tests are now applied as the
13        numbers are read.
15    3.  Tidy code in pcre_exec.c where two branches that used to be different are
16        now the same.
18    4.  The JIT compiler did not generate match limit checks for certain
19        bracketed expressions with quantifiers. This may lead to exponential
20        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
21        issue should be resolved now.
23    5.  Fixed an issue, which occures when nested alternatives are optimized
24        with table jumps.
26    6.  Inserted two casts and changed some ints to size_t in the light of some
27        reported 64-bit compiler warnings (Bugzilla 1477).
29    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
30        an empty string, which sometimes were behaving incorrectly in the
31        interpreter (though correctly in the JIT matcher). This pcretest input is
32        an example:
34          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
37        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
38        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
39        for an empty string was breaking the inner loop and carrying on at a lower
40        level, when possessive repeated groups should always return to a higher
41        level as they have no backtrack points in them. The empty string test now
42        occurs at the outer level.
44    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
45        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
47    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
48        doesn't).
50    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
51        to hold a pattern to be incorrectly computed (too small) when there were
52        named back references to duplicated names. This could cause "internal
53        error: code overflow" or "double free or corruption" or other memory
54        handling errors.
56    11. When named subpatterns had the same prefixes, back references could be
57        confused. For example, in this pattern:
59          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
61        the reference to 'Name' was incorrectly treated as a reference to a
62        duplicate name.
64    12. A pattern such as /^s?c/mi8 where the optional character has more than
65        one "other case" was incorrectly compiled such that it would only try to
66        match starting at "c".
68    13. When a pattern starting with \s was studied, VT was not included in the
69        list of possible starting characters; this should have been part of the
70        8.34/18 patch.
72    14. If a character class started [\Qx]... where x is any character, the class
73        was incorrectly terminated at the ].
75    15. If a pattern that started with a caseless match for a character with more
76        than one "other case" was studied, PCRE did not set up the starting code
77        unit bit map for the list of possible characters. Now it does. This is an
78        optimization improvement, not a bug fix.
80    16. The Unicode data tables have been updated to Unicode 7.0.0.
83    Version 8.35 04-April-2014
84    --------------------------
86    1.  A new flag is set, when property checks are present in an XCLASS.
87        When this flag is not set, PCRE can perform certain optimizations
88        such as studying these XCLASS-es.
90    2.  The auto-possessification of character sets were improved: a normal
91        and an extended character set can be compared now. Furthermore
92        the JIT compiler optimizes more character set checks.
94    3.  Got rid of some compiler warnings for potentially uninitialized variables
95        that show up only when compiled with -O2.
97    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
98        of a match later then the end of the match. The pcretest program was not
99        handling the case sensibly - it was outputting from the start to the next
100        binary zero. It now reports this situation in a message, and outputs the
101        text from the end to the start.
103    5.  Fast forward search is improved in JIT. Instead of the first three
104        characters, any three characters with fixed position can be searched.
105        Search order: first, last, middle.
107    6.  Improve character range checks in JIT. Characters are read by an inprecise
108        function now, which returns with an unknown value if the character code is
109        above a certain treshold (e.g: 256). The only limitation is that the value
110        must be bigger than the treshold as well. This function is useful, when
111        the characters above the treshold are handled in the same way.
113    7.  The macros whose names start with RAWUCHAR are placeholders for a future
114        mode in which only the bottom 21 bits of 32-bit data items are used. To
115        make this more memorable for those maintaining the code, the names have
116        been changed to start with UCHAR21, and an extensive comment has been added
117        to their definition.
119    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
120        to the export list in Makefile.am (they were accidentally omitted from the
121        8.34 tarball).
123    9.  The informational output from pcretest used the phrase "starting byte set"
124        which is inappropriate for the 16-bit and 32-bit libraries. As the output
125        for "first char" and "need char" really means "non-UTF-char", I've changed
126        "byte" to "char", and slightly reworded the output. The documentation about
127        these values has also been (I hope) clarified.
129    10. Another JIT related optimization: use table jumps for selecting the correct
130        backtracking path, when more than four alternatives are present inside a
131        bracket.
133    11. Empty match is not possible, when the minimum length is greater than zero,
134        and there is no \K in the pattern. JIT should avoid empty match checks in
135        such cases.
137    12. In a caseless character class with UCP support, when a character with more
138        than one alternative case was not the first character of a range, not all
139        the alternative cases were added to the class. For example, s and \x{17f}
140        are both alternative cases for S: the class [RST] was handled correctly,
141        but [R-T] was not.
143    13. The configure.ac file always checked for pthread support when JIT was
144        enabled. This is not used in Windows, so I have put this test inside a
145        check for the presence of windows.h (which was already tested for).
147    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
148        The algorithm provides a way to skip certain starting offsets, and usually
149        faster than linear prefix searches.
151    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
152        as for 'fr_FR' and 'french'. For some reason, however, it then used the
153        Windows-specific input and output files, which have 'french' screwed in.
154        So this could never have worked. One of the problems with locales is that
155        they aren't always the same. I have now updated RunTest so that it checks
156        the output of the locale test (test 3) against three different output
157        files, and it allows the test to pass if any one of them matches. With luck
158        this should make the test pass on some versions of Solaris where it was
159        failing. Because of the uncertainty, the script did not used to stop if
160        test 3 failed; it now does. If further versions of a French locale ever
161        come to light, they can now easily be added.
163    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
164        there was a message during ./configure, but it did not stop. This now
165        provokes an error. The invalid example in README has been corrected.
166        If a value less than the minimum is given, the minimum value has always
167        been used, but now a warning is given.
169    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
170        was a bug in the test system, which is now fixed. Also, the list of various
171        configurations that are tested for each release did not have one with both
172        16/32 bits and --enable-bar-anycrlf. It now does.
174    18. pcretest was missing "-C bsr" for displaying the \R default setting.
176    19. Little endian PowerPC systems are supported now by the JIT compiler.
178    20. The fast forward newline mechanism could enter to an infinite loop on
179        certain invalid UTF-8 input. Although we don't support these cases
180        this issue can be fixed by a performance optimization.
182    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
183        not take account if existing stack usage. There is now a new global
184        variable called pcre_stack_guard that can be set to point to an external
185        function to check stack availability. It is called at the start of
186        processing every parenthesized group.
188    22. A typo in the code meant that in ungreedy mode the max/min qualifier
189        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
190        not match "ab".
192    23. When UTF was disabled, the JIT program reported some incorrect compile
193        errors. These messages are silenced now.
195    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
196        compiler.
198    25. Change all the temporary files used in RunGrepTest to be different to those
199        used by RunTest so that the tests can be run simultaneously, for example by
200        "make -j check".
203    Version 8.34 15-December-2013
204    -----------------------------
206    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
207        executable memory. Patch inspired by Carsten Klein.
209    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
210        this macro is never tested and has no effect, because the work to support
211        coverage involves only compiling and linking options and special targets in
212        the Makefile. The comment in config.h implied that defining the macro would
213        enable coverage support, which is totally false. There was also support for
214        setting this macro in the CMake files (my fault, I just copied it from
215        configure). SUPPORT_GCOV has now been removed.
217    3.  Make a small performance improvement in strlen16() and strlen32() in
218        pcretest.
220    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
221        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
222        these cases). There was also one in pcretest.c.
224    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
226    6.  In UTF mode, the code for checking whether a group could match an empty
227        string (which is used for indefinitely repeated groups to allow for
228        breaking an infinite loop) was broken when the group contained a repeated
229        negated single-character class with a character that occupied more than one
230        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
231        UTF-8 mode). The effect was undefined: the group might or might not be
232        deemed as matching an empty string, or the program might have crashed.
234    7.  The code for checking whether a group could match an empty string was not
235        recognizing that \h, \H, \v, \V, and \R must match a character.
237    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
238        an empty string. If it can, pcretest shows this in its information output.
240    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
241        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
242        matched by pcre_exec() without using JIT:
244        (a) If the rest of the pattern did not match after a maximal run of
245            grapheme clusters, the code for backing up to try with fewer of them
246            did not always back up over a full grapheme when characters that do not
247            have the modifier quality were involved, e.g. Hangul syllables.
249        (b) If the match point in a subject started with modifier character, and
250            there was no match, the code could incorrectly back up beyond the match
251            point, and potentially beyond the first character in the subject,
252            leading to a segfault or an incorrect match result.
254    10. A conditional group with an assertion condition could lead to PCRE
255        recording an incorrect first data item for a match if no other first data
256        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
257        first data item, and therefore matched "ca" after "c" instead of at the
258        start.
260    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
261        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
263    12. The source of pcregrep now includes z/OS-specific code so that it can be
264        compiled for z/OS as part of the special z/OS distribution.
266    13. Added the -T and -TM options to pcretest.
268    14. The code in pcre_compile.c for creating the table of named capturing groups
269        has been refactored. Instead of creating the table dynamically during the
270        actual compiling pass, the information is remembered during the pre-compile
271        pass (on the stack unless there are more than 20 named groups, in which
272        case malloc() is used) and the whole table is created before the actual
273        compile happens. This has simplified the code (it is now nearly 150 lines
274        shorter) and prepared the way for better handling of references to groups
275        with duplicate names.
277    15. A back reference to a named subpattern when there is more than one of the
278        same name now checks them in the order in which they appear in the pattern.
279        The first one that is set is used for the reference. Previously only the
280        first one was inspected. This change makes PCRE more compatible with Perl.
282    16. Unicode character properties were updated from Unicode 6.3.0.
284    17. The compile-time code for auto-possessification has been refactored, based
285        on a patch by Zoltan Herczeg. It now happens after instead of during
286        compilation. The code is cleaner, and more cases are handled. The option
287        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
288        options in pcretest are provided to set it. It can also be set by
289        (*NO_AUTO_POSSESS) at the start of a pattern.
291    18. The character VT has been added to the default ("C" locale) set of
292        characters that match \s and are generally treated as white space,
293        following this same change in Perl 5.18. There is now no difference between
294        "Perl space" and "POSIX space". Whether VT is treated as white space in
295        other locales depends on the locale.
297    19. The code for checking named groups as conditions, either for being set or
298        for being recursed, has been refactored (this is related to 14 and 15
299        above). Processing unduplicated named groups should now be as fast at
300        numerical groups, and processing duplicated groups should be faster than
301        before.
303    20. Two patches to the CMake build system, by Alexander Barkov:
305          (1) Replace the "source" command by "." in CMakeLists.txt because
306              "source" is a bash-ism.
308          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
309              without these the CMake build does not work on Solaris.
311    21. Perl has changed its handling of \8 and \9. If there is no previously
312        encountered capturing group of those numbers, they are treated as the
313        literal characters 8 and 9 instead of a binary zero followed by the
314        literals. PCRE now does the same.
316    22. Following Perl, added \o{} to specify codepoints in octal, making it
317        possible to specify values greater than 0777 and also making them
318        unambiguous.
320    23. Perl now gives an error for missing closing braces after \x{... instead of
321        treating the string as literal. PCRE now does the same.
323    24. RunTest used to grumble if an inappropriate test was selected explicitly,
324        but just skip it when running all tests. This make it awkward to run ranges
325        of tests when one of them was inappropriate. Now it just skips any
326        inappropriate tests, as it always did when running all tests.
328    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
329        character types such as \d or \w, too many callouts were inserted, and the
330        data that they returned was rubbish.
332    26. In UCP mode, \s was not matching two of the characters that Perl matches,
333        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
334        were matched by \h. The code has now been refactored so that the lists of
335        the horizontal and vertical whitespace characters used for \h and \v (which
336        are defined only in one place) are now also used for \s.
338    27. Add JIT support for the 64 bit TileGX architecture.
339        Patch by Jiong Wang (Tilera Corporation).
341    28. Possessive quantifiers for classes (both explicit and automatically
342        generated) now use special opcodes instead of wrapping in ONCE brackets.
344    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
345        (because it's meaningless), this was not happening when PCRE_CASELESS was
346        set. Not wrong, but inefficient.
348    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
349        properties for \w, \d, etc) is present in a test regex. Otherwise if the
350        test contains no characters greater than 255, Perl doesn't realise it
351        should be using Unicode semantics.
353    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
354        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
355        does in Unicode mode.
357    32. Added the "forbid" facility to pcretest so that putting tests into the
358        wrong test files can sometimes be quickly detected.
360    33. There is now a limit (default 250) on the depth of nesting of parentheses.
361        This limit is imposed to control the amount of system stack used at compile
362        time. It can be changed at build time by --with-parens-nest-limit=xxx or
363        the equivalent in CMake.
365    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
366        errors. Perl warns for these when in warning mode, but PCRE has no facility
367        for giving warnings.
369    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
370        However, this was not working for (?!) because it is optimized to (*FAIL),
371        for which PCRE does not allow quantifiers. The optimization is now disabled
372        when a quantifier follows (?!). I can't see any use for this, but it makes
373        things uniform.
375    36. Perl no longer allows group names to start with digits, so I have made this
376        change also in PCRE. It simplifies the code a bit.
378    37. In extended mode, Perl ignores spaces before a + that indicates a
379        possessive quantifier. PCRE allowed a space before the quantifier, but not
380        before the possessive +. It now does.
382    38. The use of \K (reset reported match start) within a repeated possessive
383        group such as (a\Kb)*+ was not working.
385    40. Document that the same character tables must be used at compile time and
386        run time, and that the facility to pass tables to pcre_exec() and
387        pcre_dfa_exec() is for use only with saved/restored patterns.
389    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
390        features for Builds with MSVC:
392        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
393           builds). The .rc files can be used to set FileDescription and many other
394           attributes.
396        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
397           This allows higher-level build scripts which want .pdb files to avoid
398           hard-coding the exact files needed."
400    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
401        mean "start of word" and "end of word", respectively, as a transition aid.
403    43. A minimizing repeat of a class containing codepoints greater than 255 in
404        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
405        compiled to use the heap for recursion.
407    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
408        is configured.
411    Version 8.33 28-May-2013
412    ------------------------
414    1.  Added 'U' to some constants that are compared to unsigned integers, to
415        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
416        variables that are added to signed variables, to ensure the result is
417        signed and can be negated.
419    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
420        CMake config files.
422    3.  Revise the creation of config.h.generic so that all boolean macros are
423        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
424        overriding via -D on the command line possible.
426    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
427        to unsigned int is reported to make a quite noticeable speed difference in
428        a specific Windows environment. Testing on Linux did also appear to show
429        some benefit (and it is clearly not harmful). Also fixed the definition of
430        Xop which should be unsigned.
432    5.  Related to (4), changing the definition of the intermediate variable cc
433        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
434        improvements.
436    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
437        unnecessary spaces.
439    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
440        and later.
442    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
444    9.  Optimizing fast_forward_start_bits in JIT.
446    10. Adding support for callouts in JIT, and fixing some issues revealed
447        during this work. Namely:
449        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
451        (b) Minimum length was not checked before the matching is started.
453    11. The value of capture_last that is passed to callouts was incorrect in some
454        cases when there was a capture on one path that was subsequently abandoned
455        after a backtrack. Also, the capture_last value is now reset after a
456        recursion, since all captures are also reset in this case.
458    12. The interpreter no longer returns the "too many substrings" error in the
459        case when an overflowing capture is in a branch that is subsequently
460        abandoned after a backtrack.
462    13. In the pathological case when an offset vector of size 2 is used, pcretest
463        now prints out the matched string after a yield of 0 or 1.
465    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
466        Only supported by the JIT compiler at the moment.
468    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
470    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
471        offset of the starting point of the matching process, provided the offsets
472        vector is large enough.
474    17. The \A escape now records a lookbehind value of 1, though its execution
475        does not actually inspect the previous character. This is to ensure that,
476        in partial multi-segment matching, at least one character from the old
477        segment is retained when a new segment is processed. Otherwise, if there
478        are no lookbehinds in the pattern, \A might match incorrectly at the start
479        of a new segment.
481    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
483    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
484        gives some modest performance improvement in 8-bit mode.
486    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
487        be expressed in certain programming languages using Universal Character
488        Names.
490    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
491        which points out that "non characters" are not "characters that may not
492        appear in Unicode strings" but rather "characters that are reserved for
493        internal use and have only local meaning".
495    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
496        there was a conditional group that depended on an assertion, if the
497        assertion was false, the callout that immediately followed the alternation
498        in the condition was skipped when pcre_exec() was used for matching.
500    23. Allow an explicit callout to be inserted before an assertion that is the
501        condition for a conditional group, for compatibility with automatic
502        callouts, which always insert a callout at this point.
504    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
505        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
507    25. (*PRUNE) is now supported by the JIT compiler.
509    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
511    27. Fix the case where there are two or more SKIPs with arguments that may be
512        ignored.
514    28. (*SKIP) is now supported by the JIT compiler.
516    29. (*THEN) is now supported by the JIT compiler.
518    30. Update RunTest with additional test selector options.
520    31. The way PCRE handles backtracking verbs has been changed in two ways.
522        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
523        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
524        backtracking. In some cases this makes it more Perl-compatible, but Perl's
525        rather obscure rules do not always do the same thing.
527        (2) Previously, backtracking verbs were confined within assertions. This is
528        no longer the case for positive assertions, except for (*ACCEPT). Again,
529        this sometimes improves Perl compatibility, and sometimes does not.
531    32. A number of tests that were in test 2 because Perl did things differently
532        have been moved to test 1, because either Perl or PCRE has changed, and
533        these tests are now compatible.
535    32. Backtracking control verbs are now handled in the same way in JIT and
536        interpreter.
538    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
539        contained a forward subroutine reference caused a compile error.
541    34. Auto-detect and optimize limited repetitions in JIT.
543    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
544        blocking (*UTF) etc.
546    36. In the interpreter, maximizing pattern repetitions for characters and
547        character types now use tail recursion, which reduces stack usage.
549    37. The value of the max lookbehind was not correctly preserved if a compiled
550        and saved regex was reloaded on a host of different endianness.
552    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
553        of the compiled pattern block, expand the flags field from 16 to 32 bits
554        because it was almost full.
556    39. Try madvise first before posix_madvise.
558    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
559        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
560        original change locked out all matches of empty strings. This has been
561        changed so that one match of an empty string per line is recognized.
562        Subsequent searches on the same line (for colouring or for --only-matching,
563        for example) do not recognize empty strings.
565    41. Applied a user patch to fix a number of spelling mistakes in comments.
567    42. Data lines longer than 65536 caused pcretest to crash.
569    43. Clarified the data type for length and startoffset arguments for pcre_exec
570        and pcre_dfa_exec in the function-specific man pages, where they were
571        explicitly stated to be in bytes, never having been updated. I also added
572        some clarification to the pcreapi man page.
574    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
575        a segmentation fault.
578    Version 8.32 30-November-2012
579    -----------------------------
581    1.  Improved JIT compiler optimizations for first character search and single
582        character iterators.
584    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
585        Patch by Daniel Richard G.
587    3.  Single character iterator optimizations in the JIT compiler.
589    4.  Improved JIT compiler optimizations for character ranges.
591    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
592        Reported by Giuseppe D'Angelo.
594    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
595        of a line, was being set incorrectly in cases where .* appeared inside
596        atomic brackets at the start of a pattern, or where there was a subsequent
597        *PRUNE or *SKIP.
599    7.  Improved instruction cache flush for POWER/PowerPC.
600        Patch by Daniel Richard G.
602    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
603        grep:
605        (a) There is now no limit to the number of patterns to be matched.
607        (b) An error is given if a pattern is too long.
609        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
610            are now supported.
612        (d) --exclude-from and --include-from (multiple use) have been added.
614        (e) Exclusions and inclusions now apply to all files and directories, not
615            just to those obtained from scanning a directory recursively.
617        (f) Multiple uses of -f and --file-list are now supported.
619        (g) In a Windows environment, the default for -d has been changed from
620            "read" (the GNU grep default) to "skip", because otherwise the presence
621            of a directory in the file list provokes an error.
623        (h) The documentation has been revised and clarified in places.
625    9.  Improve the matching speed of capturing brackets.
627    10. Changed the meaning of \X so that it now matches a Unicode extended
628        grapheme cluster.
630    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
631        out POSIX threads when JIT support is configured.
633    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
635    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
636        structure could go wrong in environments where size_t is not the same size
637        as int.
639    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
640        set.
642    15. The EBCDIC support had decayed; later updates to the code had included
643        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
644        general tidy up of EBCDIC-related issues, and the documentation was also
645        not quite right. There is now a test that can be run on ASCII systems to
646        check some of the EBCDIC-related things (but is it not a full test).
648    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
649        in a small tidy to the code.
651    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
653    18. If the --only-matching (-o) option in pcregrep is specified multiple
654        times, each one causes appropriate output. For example, -o1 -o2 outputs the
655        substrings matched by the 1st and 2nd capturing parentheses. A separating
656        string can be specified by --om-separator (default empty).
658    19. Improving the first n character searches.
660    20. Turn case lists for horizontal and vertical white space into macros so that
661        they are defined only once.
663    21. This set of changes together give more compatible Unicode case-folding
664        behaviour for characters that have more than one other case when UCP
665        support is available.
667        (a) The Unicode property table now has offsets into a new table of sets of
668            three or more characters that are case-equivalent. The MultiStage2.py
669            script that generates these tables (the pcre_ucd.c file) now scans
670            CaseFolding.txt instead of UnicodeData.txt for character case
671            information.
673        (b) The code for adding characters or ranges of characters to a character
674            class has been abstracted into a generalized function that also handles
675            case-independence. In UTF-mode with UCP support, this uses the new data
676            to handle characters with more than one other case.
678        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
679            whose other case is greater than 256 are now correctly matched
680            caselessly. Previously, the high codepoint matched the low one, but not
681            vice versa.
683        (d) The processing of \h, \H, \v, and \ in character classes now makes use
684            of the new class addition function, using character lists defined as
685            macros alongside the case definitions of 20 above.
687        (e) Caseless back references now work with characters that have more than
688            one other case.
690        (f) General caseless matching of characters with more than one other case
691            is supported.
693    22. Unicode character properties were updated from Unicode 6.2.0
695    23. Improved CMake support under Windows. Patch by Daniel Richard G.
697    24. Add support for 32-bit character strings, and UTF-32
699    25. Major JIT compiler update (code refactoring and bugfixing).
700        Experimental Sparc 32 support is added.
702    26. Applied a modified version of Daniel Richard G's patch to create
703        pcre.h.generic and config.h.generic by "make" instead of in the
704        PrepareRelease script.
706    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
707        pcre_compile.c when checking for a zero character.
709    28. Introducing a native interface for JIT. Through this interface, the compiled
710        machine code can be directly executed. The purpose of this interface is to
711        provide fast pattern matching, so several sanity checks are not performed.
712        However, feature tests are still performed. The new interface provides
713        1.4x speedup compared to the old one.
715    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
716        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
717        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
719    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
720        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
721        the "old" RFC 2279). Instead, it ended up passing a negative length to
722        pcre_exec().
724    31. Add support for GCC's visibility feature to hide internal functions.
726    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
727        "unknown -C option" after outputting 0 or 1.
729    33. There is now support for generating a code coverage report for the test
730        suite in environments where gcc is the compiler and lcov is installed. This
731        is mainly for the benefit of the developers.
733    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
734        unaddressable using valgrind annotations, allowing valgrind to detect
735        invalid memory accesses. This is mainly for the benefit of the developers.
737    25. (*UTF) can now be used to start a pattern in any of the three libraries.
739    26. Give configure error if --enable-cpp but no C++ compiler found.
742    Version 8.31 06-July-2012
743    -------------------------
745    1.  Fixing a wrong JIT test case and some compiler warnings.
747    2.  Removed a bashism from the RunTest script.
749    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
750        to unsigned type, result still unsigned" that was given by an MS compiler
751        on encountering the code "-sizeof(xxx)".
753    4.  Partial matching support is added to the JIT compiler.
755    5.  Fixed several bugs concerned with partial matching of items that consist
756        of more than one character:
758        (a) /^(..)\1/ did not partially match "aba" because checking references was
759            done on an "all or nothing" basis. This also applied to repeated
760            references.
762        (b) \R did not give a hard partial match if \r was found at the end of the
763            subject.
765        (c) \X did not give a hard partial match after matching one or more
766            characters at the end of the subject.
768        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
769            a partial match for the string "\r".
771        (e) When newline was set to CRLF, the metacharacter "." did not recognize
772            a partial match for a CR character at the end of the subject string.
774    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
775        running pcretest, the text "(JIT)" added to the output whenever JIT is
776        actually used to run the match.
778    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
779        or /S+[+] with a digit between 1 and 7.
781    8.  OP_NOT now supports any UTF character not just single-byte ones.
783    9.  (*MARK) control verb is now supported by the JIT compiler.
785    10. The command "./RunTest list" lists the available tests without actually
786        running any of them. (Because I keep forgetting what they all are.)
790    12. Applied a (slightly modified) user-supplied patch that improves performance
791        when the heap is used for recursion (compiled with --disable-stack-for-
792        recursion). Instead of malloc and free for each heap frame each time a
793        logical recursion happens, frames are retained on a chain and re-used where
794        possible. This sometimes gives as much as 30% improvement.
796    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
797        call.
799    14. As documented, (*COMMIT) is now confined to within a positive assertion.
801    15. It is now possible to link pcretest with libedit as an alternative to
802        libreadline.
804    16. (*COMMIT) control verb is now supported by the JIT compiler.
806    17. The Unicode data tables have been updated to Unicode 6.1.0.
808    18. Added --file-list option to pcregrep.
810    19. Added binary file support to pcregrep, including the -a, --binary-files,
811        -I, and --text options.
813    20. The madvise function is renamed for posix_madvise for QNX compatibility
814        reasons. Fixed by Giuseppe D'Angelo.
816    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
818    22. Changed the option for creating symbolic links for 16-bit man pages from
819        -s to -sf so that re-installing does not cause issues.
821    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
823    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
824        matches in certain environments (the workspace was not being correctly
825        retained). Also added to pcre_dfa_exec() a simple plausibility check on
826        some of the workspace data at the beginning of a restart.
828    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
829        was not doing so when it should - probably a typo introduced by SVN 528
830        (change 8.10/14).
832    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
833        \w+ when the character tables indicated that \x{c4} was a word character.
834        There were several related cases, all because the tests for doing a table
835        lookup were testing for characters less than 127 instead of 255.
837    27. If a pattern contains capturing parentheses that are not used in a match,
838        their slots in the ovector are set to -1. For those that are higher than
839        any matched groups, this happens at the end of processing. In the case when
840        there were back references that the ovector was too small to contain
841        (causing temporary malloc'd memory to be used during matching), and the
842        highest capturing number was not used, memory off the end of the ovector
843        was incorrectly being set to -1. (It was using the size of the temporary
844        memory instead of the true size.)
846    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
847        ovector size, it uses memory at the end of the block that it has got.
849    29. Check for an overlong MARK name and give an error at compile time. The
850        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
852    30. JIT compiler update.
854    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
855        Rill for the patch.
857    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
859    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
861    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
862        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
863        was enabled.
865    35. Improve JIT code generation for greedy plus quantifier.
867    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
868        1 to "aa" instead of to an empty string. The bug affected repeated groups
869        that could potentially match an empty string.
871    37. Optimizing single character iterators in JIT.
873    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
874        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
875        codepoints that are too big for the mode are faulted, and in a UTF mode,
876        disallowed codepoints are also faulted.
878    39. If PCRE was compiled with UTF support, in three places in the DFA
879        matcher there was code that should only have been obeyed in UTF mode, but
880        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
881        processing when bytes with values greater than 127 were present. In 16-bit
882        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
883        both cases the values are those that cannot be the first data item in a UTF
884        character. The three items that might have provoked this were recursions,
885        possessively repeated groups, and atomic groups.
887    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
888        and pcregrep, because some OS require shared objects to be explicitly
889        passed to ld, causing the link step to fail if they are not.
891    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
892        mode, patterns that started with \h* or \R* might be incorrectly matched.
895    Version 8.30 04-February-2012
896    -----------------------------
898    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
899        name is defined in ctype.h.
901    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
902        only in quite long subpatterns.
904    3.  Removed the function pcre_info(), which has been obsolete and deprecated
905        since it was replaced by pcre_fullinfo() in February 2000.
907    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
908        match a (*MARK), and the match failed at the start of the subject, a
909        reference to memory before the start of the subject could occur. This bug
910        was introduced by fix 17 of release 8.21.
912    5.  A reference to an unset group with zero minimum repetition was giving
913        totally wrong answers (in non-JavaScript-compatibility mode). For example,
914        /(another)?(\1?)test/ matched against "hello world test". This bug was
915        introduced in release 8.13.
917    6.  Add support for 16-bit character strings (a large amount of work involving
918        many changes and refactorings).
920    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
921        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
922        from a file.
924    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
925        rounding is not applied in this particular case).
927    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
928        if they appear, or are escaped, in patterns.
930    10. Get rid of a number of -Wunused-but-set-variable warnings.
932    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
933        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
934        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
935        also returns the mark "x". This bug applied to capturing parentheses,
936        non-capturing parentheses, and atomic parentheses. It also applied to some
937        assertions.
939    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
940        information out of configure.ac instead of relying on pcre.h.generic, which
941        is not stored in the repository.
943    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
944        -lreadline.
946    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
948    15. Applied Graycode's patch to put the top-level frame on the stack rather
949        than the heap when not using the stack for recursion. This gives a
950        performance improvement in many cases when recursion is not deep.
952    16. Experimental code added to "pcretest -C" to output the stack frame size.
955    Version 8.21 12-Dec-2011
956    ------------------------
958  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
960    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
961        are added as well.
963    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
964        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
965        calling _pcre_jit_exec. Some extra comments are added.
967    4.  (*MARK) settings inside atomic groups that do not contain any capturing
968        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
969        was introduced by change 18 for 8.20.
971    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
972        ECMA-262 standard.
974    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
975        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
976        This bug was probably introduced by change 9 of 8.13.
978    7.  While fixing 6 above, I noticed that a number of other items were being
979        incorrectly rejected as "not fixed length". This arose partly because newer
980        opcodes had not been added to the fixed-length checking code. I have (a)
981        corrected the bug and added tests for these items, and (b) arranged for an
982        error to occur if an unknown opcode is encountered while checking for fixed
983        length instead of just assuming "not fixed length". The items that were
984        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
985        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
986        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
988    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
989        being incorrectly compiled and would have given unpredicatble results.
991    9.  A possessively repeated subpattern with minimum repeat count greater than
992        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
993        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
994        the first (A) could occur when it should not.
996    10. Add a cast and remove a redundant test from the code.
998    11. JIT should use pcre_malloc/pcre_free for allocation.
1000    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
1001        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
1002        is anything other than /usr, -L is still shown).
1004    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
1006    14. Perl does not support \N without a following name in a [] class; PCRE now
1007        also gives an error.
1009    15. If a forward reference was repeated with an upper limit of around 2000,
1010        it caused the error "internal error: overran compiling workspace". The
1011        maximum number of forward references (including repeats) was limited by the
1012        internal workspace, and dependent on the LINK_SIZE. The code has been
1013        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
1014        the default depends on LINK_SIZE. There is a new upper limit (for safety)
1015        of around 200,000 forward references. While doing this, I also speeded up
1016        the filling in of repeated forward references.
1018    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
1019        incorrectly expecting the subject to contain another "a" after the start.
1021    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
1022        in the match, the SKIP should be ignored. This was not happening; instead
1023        the SKIP was being treated as NOMATCH. For patterns such as
1024        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
1025        tested.
1027    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
1028        now much more compatible with Perl, in particular in cases where the result
1029        is a non-match for a non-anchored pattern. For example, if
1030        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
1031        "m", where previously it did not return a name. A side effect of this
1032        change is that for partial matches, the last encountered mark name is
1033        returned, as for non matches. A number of tests that were previously not
1034        Perl-compatible have been moved into the Perl-compatible test files. The
1035        refactoring has had the pleasing side effect of removing one argument from
1036        the match() function, thus reducing its stack requirements.
1038    19. If the /S+ option was used in pcretest to study a pattern using JIT,
1039        subsequent uses of /S (without +) incorrectly behaved like /S+.
1041    21. Retrieve executable code size support for the JIT compiler and fixing
1042        some warnings.
1044    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
1045        not work when the shorter character appeared right at the end of the
1046        subject string.
1048    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
1049        systems.
1051    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
1052        output it when the /M option is used in pcretest.
1054    25. The CheckMan script was not being included in the distribution. Also, added
1055        an explicit "perl" to run Perl scripts from the PrepareRelease script
1056        because this is reportedly needed in Windows.
1058    26. If study data was being save in a file and studying had not found a set of
1059        "starts with" bytes for the pattern, the data written to the file (though
1060        never used) was taken from uninitialized memory and so caused valgrind to
1061        complain.
1063    27. Updated RunTest.bat as provided by Sheri Pierce.
1065    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
1067    29. Computation of memory usage for the table of capturing group names was
1068        giving an unnecessarily large value.
1071  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
1072  ------------------------  ------------------------
# Line 1021  Version 7.9 11-Apr-09 Line 2082  Version 7.9 11-Apr-09
2082  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
2083      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
2084      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2085      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2086        8.33.]
2088  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
2089      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 1264  Version 7.7 07-May-08 Line 2326  Version 7.7 07-May-08
2326      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2327      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2328      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2329      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2330      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2331      was subsequently set up correctly.)      was subsequently set up correctly.)

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