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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.32  Version 8.37 xx-xxx-2015
5  ------------  ------------------------
6    
7    1.  When an (*ACCEPT) is triggered inside capturing parentheses, it arranges
8        for those parentheses to be closed with whatever has been captured so far.
9        However, it was failing to mark any other groups between the hightest
10        capture so far and the currrent group as "unset". Thus, the ovector for
11        those groups contained whatever was previously there. An example is the
12        pattern /(x)|((*ACCEPT))/ when matched against "abcd".
13    
14    2.  If an assertion condition was quantified with a minimum of zero (an odd
15        thing to do, but it happened), SIGSEGV or other misbehaviour could occur.
16    
17    3.  If a pattern in pcretest input had the P (POSIX) modifier followed by an
18        unrecognized modifier, a crash could occur.
19    
20    4.  An attempt to do global matching in pcretest with a zero-length ovector
21        caused a crash.
22    
23    5.  Fixed a memory leak during matching that could occur for a subpattern
24        subroutine call (recursive or otherwise) if the number of captured groups
25        that had to be saved was greater than ten.
26    
27    6.  Catch a bad opcode during auto-possessification after compiling a bad UTF
28        string with NO_UTF_CHECK. This is a tidyup, not a bug fix, as passing bad
29        UTF with NO_UTF_CHECK is documented as having an undefined outcome.
30    
31    7.  A UTF pattern containing a "not" match of a non-ASCII character and a
32        subroutine reference could loop at compile time. Example: /[^\xff]((?1))/.
33    
34    8. When a pattern is compiled, it remembers the highest back reference so that
35       when matching, if the ovector is too small, extra memory can be obtained to
36       use instead. A conditional subpattern whose condition is a check on a
37       capture having happened, such as, for example in the pattern
38       /^(?:(a)|b)(?(1)A|B)/, is another kind of back reference, but it was not
39       setting the highest backreference number. This mattered only if pcre_exec()
40       was called with an ovector that was too small to hold the capture, and there
41       was no other kind of back reference (a situation which is probably quite
42       rare). The effect of the bug was that the condition was always treated as
43       FALSE when the capture could not be consulted, leading to a incorrect
44       behaviour by pcre2_match(). This bug has been fixed.
45    
46    9. A reference to a duplicated named group (either a back reference or a test
47       for being set in a conditional) that occurred in a part of the pattern where
48       PCRE_DUPNAMES was not set caused the amount of memory needed for the pattern
49       to be incorrectly calculated, leading to overwriting.
50    
51    10. A mutually recursive set of back references such as (\2)(\1) caused a
52        segfault at study time (while trying to find the minimum matching length).
53        The infinite loop is now broken (with the minimum length unset, that is,
54        zero).
55    
56    11. If an assertion that was used as a condition was quantified with a minimum
57        of zero, matching went wrong. In particular, if the whole group had
58        unlimited repetition and could match an empty string, a segfault was
59        likely. The pattern (?(?=0)?)+ is an example that caused this. Perl allows
60        assertions to be quantified, but not if they are being used as conditions,
61        so the above pattern is faulted by Perl. PCRE has now been changed so that
62        it also rejects such patterns.
63    
64    12. A possessive capturing group such as (a)*+ with a minimum repeat of zero
65        failed to allow the zero-repeat case if pcre2_exec() was called with an
66        ovector too small to capture the group.
67    
68    13. Fixed two bugs in pcretest that were discovered by fuzzing and reported by
69        Red Hat Product Security:
70    
71        (a) A crash if /K and /F were both set with the option to save the compiled
72        pattern.
73    
74        (b) Another crash if the option to print captured substrings in a callout
75        was combined with setting a null ovector, for example \O\C+ as a subject
76        string.
77    
78    14. A pattern such as "((?2){0,1999}())?", which has a group containing a
79        forward reference repeated a large (but limited) number of times within a
80        repeated outer group that has a zero minimum quantifier, caused incorrect
81        code to be compiled, leading to the error "internal error:
82        previously-checked referenced subpattern not found" when an incorrect
83        memory address was read. This bug was reported as "heap overflow",
84        discovered by Kai Lu of Fortinet's FortiGuard Labs.
85    
86    23. A pattern such as "((?+1)(\1))/" containing a forward reference subroutine
87        call within a group that also contained a recursive back reference caused
88        incorrect code to be compiled. This bug was reported as "heap overflow",
89        discovered by Kai Lu of Fortinet's FortiGuard Labs.
90    
91    
92    Version 8.36 26-September-2014
93    ------------------------------
94    
95    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
96        -Wmissing-field-initializers and -Wunused-parameter.
97    
98    2.  The tests for quantifiers being too big (greater than 65535) were being
99        applied after reading the number, and stupidly assuming that integer
100        overflow would give a negative number. The tests are now applied as the
101        numbers are read.
102    
103    3.  Tidy code in pcre_exec.c where two branches that used to be different are
104        now the same.
105    
106    4.  The JIT compiler did not generate match limit checks for certain
107        bracketed expressions with quantifiers. This may lead to exponential
108        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
109        issue should be resolved now.
110    
111    5.  Fixed an issue, which occures when nested alternatives are optimized
112        with table jumps.
113    
114    6.  Inserted two casts and changed some ints to size_t in the light of some
115        reported 64-bit compiler warnings (Bugzilla 1477).
116    
117    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
118        an empty string, which sometimes were behaving incorrectly in the
119        interpreter (though correctly in the JIT matcher). This pcretest input is
120        an example:
121    
122          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
123          NON QUOTED "QUOT""ED" AFTER "NOT MATCHED
124    
125        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
126        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
127        for an empty string was breaking the inner loop and carrying on at a lower
128        level, when possessive repeated groups should always return to a higher
129        level as they have no backtrack points in them. The empty string test now
130        occurs at the outer level.
131    
132    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
133        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
134    
135    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
136        doesn't).
137    
138    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
139        to hold a pattern to be incorrectly computed (too small) when there were
140        named back references to duplicated names. This could cause "internal
141        error: code overflow" or "double free or corruption" or other memory
142        handling errors.
143    
144    11. When named subpatterns had the same prefixes, back references could be
145        confused. For example, in this pattern:
146    
147          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
148    
149        the reference to 'Name' was incorrectly treated as a reference to a
150        duplicate name.
151    
152    12. A pattern such as /^s?c/mi8 where the optional character has more than
153        one "other case" was incorrectly compiled such that it would only try to
154        match starting at "c".
155    
156    13. When a pattern starting with \s was studied, VT was not included in the
157        list of possible starting characters; this should have been part of the
158        8.34/18 patch.
159    
160    14. If a character class started [\Qx]... where x is any character, the class
161        was incorrectly terminated at the ].
162    
163    15. If a pattern that started with a caseless match for a character with more
164        than one "other case" was studied, PCRE did not set up the starting code
165        unit bit map for the list of possible characters. Now it does. This is an
166        optimization improvement, not a bug fix.
167    
168    16. The Unicode data tables have been updated to Unicode 7.0.0.
169    
170    17. Fixed a number of memory leaks in pcregrep.
171    
172    18. Avoid a compiler warning (from some compilers) for a function call with
173        a cast that removes "const" from an lvalue by using an intermediate
174        variable (to which the compiler does not object).
175    
176    19. Incorrect code was compiled if a group that contained an internal recursive
177        back reference was optional (had quantifier with a minimum of zero). This
178        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
179        caused segmentation faults because of stack overflows at compile time.
180    
181    20. A pattern such as /((?(R)a|(?1)))+/, which contains a recursion within a
182        group that is quantified with an indefinite repeat, caused a compile-time
183        loop which used up all the system stack and provoked a segmentation fault.
184        This was not the same bug as 19 above.
185    
186    21. Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.
187        Patch by Mike Frysinger.
188    
189    
190    Version 8.35 04-April-2014
191    --------------------------
192    
193    1.  A new flag is set, when property checks are present in an XCLASS.
194        When this flag is not set, PCRE can perform certain optimizations
195        such as studying these XCLASS-es.
196    
197    2.  The auto-possessification of character sets were improved: a normal
198        and an extended character set can be compared now. Furthermore
199        the JIT compiler optimizes more character set checks.
200    
201    3.  Got rid of some compiler warnings for potentially uninitialized variables
202        that show up only when compiled with -O2.
203    
204    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
205        of a match later then the end of the match. The pcretest program was not
206        handling the case sensibly - it was outputting from the start to the next
207        binary zero. It now reports this situation in a message, and outputs the
208        text from the end to the start.
209    
210    5.  Fast forward search is improved in JIT. Instead of the first three
211        characters, any three characters with fixed position can be searched.
212        Search order: first, last, middle.
213    
214    6.  Improve character range checks in JIT. Characters are read by an inprecise
215        function now, which returns with an unknown value if the character code is
216        above a certain threshold (e.g: 256). The only limitation is that the value
217        must be bigger than the threshold as well. This function is useful when
218        the characters above the threshold are handled in the same way.
219    
220    7.  The macros whose names start with RAWUCHAR are placeholders for a future
221        mode in which only the bottom 21 bits of 32-bit data items are used. To
222        make this more memorable for those maintaining the code, the names have
223        been changed to start with UCHAR21, and an extensive comment has been added
224        to their definition.
225    
226    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
227        to the export list in Makefile.am (they were accidentally omitted from the
228        8.34 tarball).
229    
230    9.  The informational output from pcretest used the phrase "starting byte set"
231        which is inappropriate for the 16-bit and 32-bit libraries. As the output
232        for "first char" and "need char" really means "non-UTF-char", I've changed
233        "byte" to "char", and slightly reworded the output. The documentation about
234        these values has also been (I hope) clarified.
235    
236    10. Another JIT related optimization: use table jumps for selecting the correct
237        backtracking path, when more than four alternatives are present inside a
238        bracket.
239    
240    11. Empty match is not possible, when the minimum length is greater than zero,
241        and there is no \K in the pattern. JIT should avoid empty match checks in
242        such cases.
243    
244    12. In a caseless character class with UCP support, when a character with more
245        than one alternative case was not the first character of a range, not all
246        the alternative cases were added to the class. For example, s and \x{17f}
247        are both alternative cases for S: the class [RST] was handled correctly,
248        but [R-T] was not.
249    
250    13. The configure.ac file always checked for pthread support when JIT was
251        enabled. This is not used in Windows, so I have put this test inside a
252        check for the presence of windows.h (which was already tested for).
253    
254    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
255        The algorithm provides a way to skip certain starting offsets, and usually
256        faster than linear prefix searches.
257    
258    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
259        as for 'fr_FR' and 'french'. For some reason, however, it then used the
260        Windows-specific input and output files, which have 'french' screwed in.
261        So this could never have worked. One of the problems with locales is that
262        they aren't always the same. I have now updated RunTest so that it checks
263        the output of the locale test (test 3) against three different output
264        files, and it allows the test to pass if any one of them matches. With luck
265        this should make the test pass on some versions of Solaris where it was
266        failing. Because of the uncertainty, the script did not used to stop if
267        test 3 failed; it now does. If further versions of a French locale ever
268        come to light, they can now easily be added.
269    
270    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
271        there was a message during ./configure, but it did not stop. This now
272        provokes an error. The invalid example in README has been corrected.
273        If a value less than the minimum is given, the minimum value has always
274        been used, but now a warning is given.
275    
276    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
277        was a bug in the test system, which is now fixed. Also, the list of various
278        configurations that are tested for each release did not have one with both
279        16/32 bits and --enable-bar-anycrlf. It now does.
280    
281    18. pcretest was missing "-C bsr" for displaying the \R default setting.
282    
283    19. Little endian PowerPC systems are supported now by the JIT compiler.
284    
285    20. The fast forward newline mechanism could enter to an infinite loop on
286        certain invalid UTF-8 input. Although we don't support these cases
287        this issue can be fixed by a performance optimization.
288    
289    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
290        not take account if existing stack usage. There is now a new global
291        variable called pcre_stack_guard that can be set to point to an external
292        function to check stack availability. It is called at the start of
293        processing every parenthesized group.
294    
295    22. A typo in the code meant that in ungreedy mode the max/min qualifier
296        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
297        not match "ab".
298    
299    23. When UTF was disabled, the JIT program reported some incorrect compile
300        errors. These messages are silenced now.
301    
302    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
303        compiler.
304    
305    25. Change all the temporary files used in RunGrepTest to be different to those
306        used by RunTest so that the tests can be run simultaneously, for example by
307        "make -j check".
308    
309    
310    Version 8.34 15-December-2013
311    -----------------------------
312    
313    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
314        executable memory. Patch inspired by Carsten Klein.
315    
316    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
317        this macro is never tested and has no effect, because the work to support
318        coverage involves only compiling and linking options and special targets in
319        the Makefile. The comment in config.h implied that defining the macro would
320        enable coverage support, which is totally false. There was also support for
321        setting this macro in the CMake files (my fault, I just copied it from
322        configure). SUPPORT_GCOV has now been removed.
323    
324    3.  Make a small performance improvement in strlen16() and strlen32() in
325        pcretest.
326    
327    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
328        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
329        these cases). There was also one in pcretest.c.
330    
331    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
332    
333    6.  In UTF mode, the code for checking whether a group could match an empty
334        string (which is used for indefinitely repeated groups to allow for
335        breaking an infinite loop) was broken when the group contained a repeated
336        negated single-character class with a character that occupied more than one
337        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
338        UTF-8 mode). The effect was undefined: the group might or might not be
339        deemed as matching an empty string, or the program might have crashed.
340    
341    7.  The code for checking whether a group could match an empty string was not
342        recognizing that \h, \H, \v, \V, and \R must match a character.
343    
344    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
345        an empty string. If it can, pcretest shows this in its information output.
346    
347    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
348        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
349        matched by pcre_exec() without using JIT:
350    
351        (a) If the rest of the pattern did not match after a maximal run of
352            grapheme clusters, the code for backing up to try with fewer of them
353            did not always back up over a full grapheme when characters that do not
354            have the modifier quality were involved, e.g. Hangul syllables.
355    
356        (b) If the match point in a subject started with modifier character, and
357            there was no match, the code could incorrectly back up beyond the match
358            point, and potentially beyond the first character in the subject,
359            leading to a segfault or an incorrect match result.
360    
361    10. A conditional group with an assertion condition could lead to PCRE
362        recording an incorrect first data item for a match if no other first data
363        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
364        first data item, and therefore matched "ca" after "c" instead of at the
365        start.
366    
367    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
368        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
369    
370    12. The source of pcregrep now includes z/OS-specific code so that it can be
371        compiled for z/OS as part of the special z/OS distribution.
372    
373    13. Added the -T and -TM options to pcretest.
374    
375    14. The code in pcre_compile.c for creating the table of named capturing groups
376        has been refactored. Instead of creating the table dynamically during the
377        actual compiling pass, the information is remembered during the pre-compile
378        pass (on the stack unless there are more than 20 named groups, in which
379        case malloc() is used) and the whole table is created before the actual
380        compile happens. This has simplified the code (it is now nearly 150 lines
381        shorter) and prepared the way for better handling of references to groups
382        with duplicate names.
383    
384    15. A back reference to a named subpattern when there is more than one of the
385        same name now checks them in the order in which they appear in the pattern.
386        The first one that is set is used for the reference. Previously only the
387        first one was inspected. This change makes PCRE more compatible with Perl.
388    
389    16. Unicode character properties were updated from Unicode 6.3.0.
390    
391    17. The compile-time code for auto-possessification has been refactored, based
392        on a patch by Zoltan Herczeg. It now happens after instead of during
393        compilation. The code is cleaner, and more cases are handled. The option
394        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
395        options in pcretest are provided to set it. It can also be set by
396        (*NO_AUTO_POSSESS) at the start of a pattern.
397    
398    18. The character VT has been added to the default ("C" locale) set of
399        characters that match \s and are generally treated as white space,
400        following this same change in Perl 5.18. There is now no difference between
401        "Perl space" and "POSIX space". Whether VT is treated as white space in
402        other locales depends on the locale.
403    
404    19. The code for checking named groups as conditions, either for being set or
405        for being recursed, has been refactored (this is related to 14 and 15
406        above). Processing unduplicated named groups should now be as fast at
407        numerical groups, and processing duplicated groups should be faster than
408        before.
409    
410    20. Two patches to the CMake build system, by Alexander Barkov:
411    
412          (1) Replace the "source" command by "." in CMakeLists.txt because
413              "source" is a bash-ism.
414    
415          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
416              without these the CMake build does not work on Solaris.
417    
418    21. Perl has changed its handling of \8 and \9. If there is no previously
419        encountered capturing group of those numbers, they are treated as the
420        literal characters 8 and 9 instead of a binary zero followed by the
421        literals. PCRE now does the same.
422    
423    22. Following Perl, added \o{} to specify codepoints in octal, making it
424        possible to specify values greater than 0777 and also making them
425        unambiguous.
426    
427    23. Perl now gives an error for missing closing braces after \x{... instead of
428        treating the string as literal. PCRE now does the same.
429    
430    24. RunTest used to grumble if an inappropriate test was selected explicitly,
431        but just skip it when running all tests. This make it awkward to run ranges
432        of tests when one of them was inappropriate. Now it just skips any
433        inappropriate tests, as it always did when running all tests.
434    
435    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
436        character types such as \d or \w, too many callouts were inserted, and the
437        data that they returned was rubbish.
438    
439    26. In UCP mode, \s was not matching two of the characters that Perl matches,
440        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
441        were matched by \h. The code has now been refactored so that the lists of
442        the horizontal and vertical whitespace characters used for \h and \v (which
443        are defined only in one place) are now also used for \s.
444    
445    27. Add JIT support for the 64 bit TileGX architecture.
446        Patch by Jiong Wang (Tilera Corporation).
447    
448    28. Possessive quantifiers for classes (both explicit and automatically
449        generated) now use special opcodes instead of wrapping in ONCE brackets.
450    
451    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
452        (because it's meaningless), this was not happening when PCRE_CASELESS was
453        set. Not wrong, but inefficient.
454    
455    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
456        properties for \w, \d, etc) is present in a test regex. Otherwise if the
457        test contains no characters greater than 255, Perl doesn't realise it
458        should be using Unicode semantics.
459    
460    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
461        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
462        does in Unicode mode.
463    
464    32. Added the "forbid" facility to pcretest so that putting tests into the
465        wrong test files can sometimes be quickly detected.
466    
467    33. There is now a limit (default 250) on the depth of nesting of parentheses.
468        This limit is imposed to control the amount of system stack used at compile
469        time. It can be changed at build time by --with-parens-nest-limit=xxx or
470        the equivalent in CMake.
471    
472    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
473        errors. Perl warns for these when in warning mode, but PCRE has no facility
474        for giving warnings.
475    
476    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
477        However, this was not working for (?!) because it is optimized to (*FAIL),
478        for which PCRE does not allow quantifiers. The optimization is now disabled
479        when a quantifier follows (?!). I can't see any use for this, but it makes
480        things uniform.
481    
482    36. Perl no longer allows group names to start with digits, so I have made this
483        change also in PCRE. It simplifies the code a bit.
484    
485    37. In extended mode, Perl ignores spaces before a + that indicates a
486        possessive quantifier. PCRE allowed a space before the quantifier, but not
487        before the possessive +. It now does.
488    
489    38. The use of \K (reset reported match start) within a repeated possessive
490        group such as (a\Kb)*+ was not working.
491    
492    40. Document that the same character tables must be used at compile time and
493        run time, and that the facility to pass tables to pcre_exec() and
494        pcre_dfa_exec() is for use only with saved/restored patterns.
495    
496    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
497        features for Builds with MSVC:
498    
499        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
500           builds). The .rc files can be used to set FileDescription and many other
501           attributes.
502    
503        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
504           This allows higher-level build scripts which want .pdb files to avoid
505           hard-coding the exact files needed."
506    
507    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
508        mean "start of word" and "end of word", respectively, as a transition aid.
509    
510    43. A minimizing repeat of a class containing codepoints greater than 255 in
511        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
512        compiled to use the heap for recursion.
513    
514    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
515        is configured.
516    
517    
518    Version 8.33 28-May-2013
519    ------------------------
520    
521    1.  Added 'U' to some constants that are compared to unsigned integers, to
522        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
523        variables that are added to signed variables, to ensure the result is
524        signed and can be negated.
525    
526    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
527        CMake config files.
528    
529    3.  Revise the creation of config.h.generic so that all boolean macros are
530        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
531        overriding via -D on the command line possible.
532    
533    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
534        to unsigned int is reported to make a quite noticeable speed difference in
535        a specific Windows environment. Testing on Linux did also appear to show
536        some benefit (and it is clearly not harmful). Also fixed the definition of
537        Xop which should be unsigned.
538    
539    5.  Related to (4), changing the definition of the intermediate variable cc
540        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
541        improvements.
542    
543    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
544        unnecessary spaces.
545    
546    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
547        and later.
548    
549    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
550    
551    9.  Optimizing fast_forward_start_bits in JIT.
552    
553    10. Adding support for callouts in JIT, and fixing some issues revealed
554        during this work. Namely:
555    
556        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
557    
558        (b) Minimum length was not checked before the matching is started.
559    
560    11. The value of capture_last that is passed to callouts was incorrect in some
561        cases when there was a capture on one path that was subsequently abandoned
562        after a backtrack. Also, the capture_last value is now reset after a
563        recursion, since all captures are also reset in this case.
564    
565    12. The interpreter no longer returns the "too many substrings" error in the
566        case when an overflowing capture is in a branch that is subsequently
567        abandoned after a backtrack.
568    
569    13. In the pathological case when an offset vector of size 2 is used, pcretest
570        now prints out the matched string after a yield of 0 or 1.
571    
572    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
573        Only supported by the JIT compiler at the moment.
574    
575    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
576    
577    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
578        offset of the starting point of the matching process, provided the offsets
579        vector is large enough.
580    
581    17. The \A escape now records a lookbehind value of 1, though its execution
582        does not actually inspect the previous character. This is to ensure that,
583        in partial multi-segment matching, at least one character from the old
584        segment is retained when a new segment is processed. Otherwise, if there
585        are no lookbehinds in the pattern, \A might match incorrectly at the start
586        of a new segment.
587    
588    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
589    
590    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
591        gives some modest performance improvement in 8-bit mode.
592    
593    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
594        be expressed in certain programming languages using Universal Character
595        Names.
596    
597    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
598        which points out that "non characters" are not "characters that may not
599        appear in Unicode strings" but rather "characters that are reserved for
600        internal use and have only local meaning".
601    
602    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
603        there was a conditional group that depended on an assertion, if the
604        assertion was false, the callout that immediately followed the alternation
605        in the condition was skipped when pcre_exec() was used for matching.
606    
607    23. Allow an explicit callout to be inserted before an assertion that is the
608        condition for a conditional group, for compatibility with automatic
609        callouts, which always insert a callout at this point.
610    
611    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
612        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
613    
614    25. (*PRUNE) is now supported by the JIT compiler.
615    
616    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
617    
618    27. Fix the case where there are two or more SKIPs with arguments that may be
619        ignored.
620    
621    28. (*SKIP) is now supported by the JIT compiler.
622    
623    29. (*THEN) is now supported by the JIT compiler.
624    
625    30. Update RunTest with additional test selector options.
626    
627    31. The way PCRE handles backtracking verbs has been changed in two ways.
628    
629        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
630        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
631        backtracking. In some cases this makes it more Perl-compatible, but Perl's
632        rather obscure rules do not always do the same thing.
633    
634        (2) Previously, backtracking verbs were confined within assertions. This is
635        no longer the case for positive assertions, except for (*ACCEPT). Again,
636        this sometimes improves Perl compatibility, and sometimes does not.
637    
638    32. A number of tests that were in test 2 because Perl did things differently
639        have been moved to test 1, because either Perl or PCRE has changed, and
640        these tests are now compatible.
641    
642    32. Backtracking control verbs are now handled in the same way in JIT and
643        interpreter.
644    
645    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
646        contained a forward subroutine reference caused a compile error.
647    
648    34. Auto-detect and optimize limited repetitions in JIT.
649    
650    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
651        blocking (*UTF) etc.
652    
653    36. In the interpreter, maximizing pattern repetitions for characters and
654        character types now use tail recursion, which reduces stack usage.
655    
656    37. The value of the max lookbehind was not correctly preserved if a compiled
657        and saved regex was reloaded on a host of different endianness.
658    
659    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
660        of the compiled pattern block, expand the flags field from 16 to 32 bits
661        because it was almost full.
662    
663    39. Try madvise first before posix_madvise.
664    
665    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
666        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
667        original change locked out all matches of empty strings. This has been
668        changed so that one match of an empty string per line is recognized.
669        Subsequent searches on the same line (for colouring or for --only-matching,
670        for example) do not recognize empty strings.
671    
672    41. Applied a user patch to fix a number of spelling mistakes in comments.
673    
674    42. Data lines longer than 65536 caused pcretest to crash.
675    
676    43. Clarified the data type for length and startoffset arguments for pcre_exec
677        and pcre_dfa_exec in the function-specific man pages, where they were
678        explicitly stated to be in bytes, never having been updated. I also added
679        some clarification to the pcreapi man page.
680    
681    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
682        a segmentation fault.
683    
684    
685    Version 8.32 30-November-2012
686    -----------------------------
687    
688  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
689      character iterators.      character iterators.
# Line 12  Version 8.32 Line 693  Version 8.32
693    
694  3.  Single character iterator optimizations in the JIT compiler.  3.  Single character iterator optimizations in the JIT compiler.
695    
696    4.  Improved JIT compiler optimizations for character ranges.
697    
698    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
699        Reported by Giuseppe D'Angelo.
700    
701    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
702        of a line, was being set incorrectly in cases where .* appeared inside
703        atomic brackets at the start of a pattern, or where there was a subsequent
704        *PRUNE or *SKIP.
705    
706    7.  Improved instruction cache flush for POWER/PowerPC.
707        Patch by Daniel Richard G.
708    
709    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
710        grep:
711    
712        (a) There is now no limit to the number of patterns to be matched.
713    
714        (b) An error is given if a pattern is too long.
715    
716        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
717            are now supported.
718    
719        (d) --exclude-from and --include-from (multiple use) have been added.
720    
721        (e) Exclusions and inclusions now apply to all files and directories, not
722            just to those obtained from scanning a directory recursively.
723    
724        (f) Multiple uses of -f and --file-list are now supported.
725    
726        (g) In a Windows environment, the default for -d has been changed from
727            "read" (the GNU grep default) to "skip", because otherwise the presence
728            of a directory in the file list provokes an error.
729    
730        (h) The documentation has been revised and clarified in places.
731    
732    9.  Improve the matching speed of capturing brackets.
733    
734    10. Changed the meaning of \X so that it now matches a Unicode extended
735        grapheme cluster.
736    
737    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
738        out POSIX threads when JIT support is configured.
739    
740    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
741    
742    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
743        structure could go wrong in environments where size_t is not the same size
744        as int.
745    
746    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
747        set.
748    
749    15. The EBCDIC support had decayed; later updates to the code had included
750        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
751        general tidy up of EBCDIC-related issues, and the documentation was also
752        not quite right. There is now a test that can be run on ASCII systems to
753        check some of the EBCDIC-related things (but is it not a full test).
754    
755    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
756        in a small tidy to the code.
757    
758    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
759    
760    18. If the --only-matching (-o) option in pcregrep is specified multiple
761        times, each one causes appropriate output. For example, -o1 -o2 outputs the
762        substrings matched by the 1st and 2nd capturing parentheses. A separating
763        string can be specified by --om-separator (default empty).
764    
765    19. Improving the first n character searches.
766    
767    20. Turn case lists for horizontal and vertical white space into macros so that
768        they are defined only once.
769    
770    21. This set of changes together give more compatible Unicode case-folding
771        behaviour for characters that have more than one other case when UCP
772        support is available.
773    
774        (a) The Unicode property table now has offsets into a new table of sets of
775            three or more characters that are case-equivalent. The MultiStage2.py
776            script that generates these tables (the pcre_ucd.c file) now scans
777            CaseFolding.txt instead of UnicodeData.txt for character case
778            information.
779    
780        (b) The code for adding characters or ranges of characters to a character
781            class has been abstracted into a generalized function that also handles
782            case-independence. In UTF-mode with UCP support, this uses the new data
783            to handle characters with more than one other case.
784    
785        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
786            whose other case is greater than 256 are now correctly matched
787            caselessly. Previously, the high codepoint matched the low one, but not
788            vice versa.
789    
790        (d) The processing of \h, \H, \v, and \ in character classes now makes use
791            of the new class addition function, using character lists defined as
792            macros alongside the case definitions of 20 above.
793    
794        (e) Caseless back references now work with characters that have more than
795            one other case.
796    
797        (f) General caseless matching of characters with more than one other case
798            is supported.
799    
800    22. Unicode character properties were updated from Unicode 6.2.0
801    
802    23. Improved CMake support under Windows. Patch by Daniel Richard G.
803    
804    24. Add support for 32-bit character strings, and UTF-32
805    
806    25. Major JIT compiler update (code refactoring and bugfixing).
807        Experimental Sparc 32 support is added.
808    
809    26. Applied a modified version of Daniel Richard G's patch to create
810        pcre.h.generic and config.h.generic by "make" instead of in the
811        PrepareRelease script.
812    
813    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
814        pcre_compile.c when checking for a zero character.
815    
816    28. Introducing a native interface for JIT. Through this interface, the compiled
817        machine code can be directly executed. The purpose of this interface is to
818        provide fast pattern matching, so several sanity checks are not performed.
819        However, feature tests are still performed. The new interface provides
820        1.4x speedup compared to the old one.
821    
822    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
823        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
824        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
825    
826    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
827        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
828        the "old" RFC 2279). Instead, it ended up passing a negative length to
829        pcre_exec().
830    
831    31. Add support for GCC's visibility feature to hide internal functions.
832    
833    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
834        "unknown -C option" after outputting 0 or 1.
835    
836    33. There is now support for generating a code coverage report for the test
837        suite in environments where gcc is the compiler and lcov is installed. This
838        is mainly for the benefit of the developers.
839    
840    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
841        unaddressable using valgrind annotations, allowing valgrind to detect
842        invalid memory accesses. This is mainly for the benefit of the developers.
843    
844    25. (*UTF) can now be used to start a pattern in any of the three libraries.
845    
846    26. Give configure error if --enable-cpp but no C++ compiler found.
847    
848    
849  Version 8.31 06-July-2012  Version 8.31 06-July-2012
850  -------------------------  -------------------------
# Line 1356  Version 7.9 11-Apr-09 Line 2189  Version 7.9 11-Apr-09
2189  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
2190      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
2191      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2192      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2193        8.33.]
2194    
2195  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
2196      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 1599  Version 7.7 07-May-08 Line 2433  Version 7.7 07-May-08
2433      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2434      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2435      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2436      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2437      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2438      was subsequently set up correctly.)      was subsequently set up correctly.)
2439    

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