/[pcre]/code/trunk/ChangeLog
ViewVC logotype

Diff of /code/trunk/ChangeLog

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 745 by ph10, Mon Nov 14 11:41:03 2011 UTC revision 1553 by ph10, Tue Apr 28 11:36:24 2015 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.37 28-April-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 pcre_exec(). 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 and given the CVE number
85        CVE-2015-2325.
86    
87    23. A pattern such as "((?+1)(\1))/" containing a forward reference subroutine
88        call within a group that also contained a recursive back reference caused
89        incorrect code to be compiled. This bug was reported as "heap overflow",
90        discovered by Kai Lu of Fortinet's FortiGuard Labs, and given the CVE
91        number CVE-2015-2326.
92    
93    24. Computing the size of the JIT read-only data in advance has been a source
94        of various issues, and new ones are still appear unfortunately. To fix
95        existing and future issues, size computation is eliminated from the code,
96        and replaced by on-demand memory allocation.
97    
98    25. A pattern such as /(?i)[A-`]/, where characters in the other case are
99        adjacent to the end of the range, and the range contained characters with
100        more than one other case, caused incorrect behaviour when compiled in UTF
101        mode. In that example, the range a-j was left out of the class.
102    
103    26. Fix JIT compilation of conditional blocks, which assertion
104        is converted to (*FAIL). E.g: /(?(?!))/.
105    
106    27. The pattern /(?(?!)^)/ caused references to random memory. This bug was
107        discovered by the LLVM fuzzer.
108    
109    28. The assertion (?!) is optimized to (*FAIL). This was not handled correctly
110        when this assertion was used as a condition, for example (?(?!)a|b). In
111        pcre2_match() it worked by luck; in pcre2_dfa_match() it gave an incorrect
112        error about an unsupported item.
113    
114    29. For some types of pattern, for example /Z*(|d*){216}/, the auto-
115        possessification code could take exponential time to complete. A recursion
116        depth limit of 1000 has been imposed to limit the resources used by this
117        optimization.
118    
119    30. A pattern such as /(*UTF)[\S\V\H]/, which contains a negated special class
120        such as \S in non-UCP mode, explicit wide characters (> 255) can be ignored
121        because \S ensures they are all in the class. The code for doing this was
122        interacting badly with the code for computing the amount of space needed to
123        compile the pattern, leading to a buffer overflow. This bug was discovered
124        by the LLVM fuzzer.
125    
126    31. A pattern such as /((?2)+)((?1))/ which has mutual recursion nested inside
127        other kinds of group caused stack overflow at compile time. This bug was
128        discovered by the LLVM fuzzer.
129    
130    32. A pattern such as /(?1)(?#?'){8}(a)/ which had a parenthesized comment
131        between a subroutine call and its quantifier was incorrectly compiled,
132        leading to buffer overflow or other errors. This bug was discovered by the
133        LLVM fuzzer.
134    
135    33. The illegal pattern /(?(?<E>.*!.*)?)/ was not being diagnosed as missing an
136        assertion after (?(. The code was failing to check the character after
137        (?(?< for the ! or = that would indicate a lookbehind assertion. This bug
138        was discovered by the LLVM fuzzer.
139    
140    34. A pattern such as /X((?2)()*+){2}+/ which has a possessive quantifier with
141        a fixed maximum following a group that contains a subroutine reference was
142        incorrectly compiled and could trigger buffer overflow. This bug was
143        discovered by the LLVM fuzzer.
144    
145    35. A mutual recursion within a lookbehind assertion such as (?<=((?2))((?1)))
146        caused a stack overflow instead of the diagnosis of a non-fixed length
147        lookbehind assertion. This bug was discovered by the LLVM fuzzer.
148    
149    36. The use of \K in a positive lookbehind assertion in a non-anchored pattern
150        (e.g. /(?<=\Ka)/) could make pcregrep loop.
151    
152    37. There was a similar problem to 36 in pcretest for global matches.
153    
154    38. If a greedy quantified \X was preceded by \C in UTF mode (e.g. \C\X*),
155        and a subsequent item in the pattern caused a non-match, backtracking over
156        the repeated \X did not stop, but carried on past the start of the subject,
157        causing reference to random memory and/or a segfault. There were also some
158        other cases where backtracking after \C could crash. This set of bugs was
159        discovered by the LLVM fuzzer.
160    
161    39. The function for finding the minimum length of a matching string could take
162        a very long time if mutual recursion was present many times in a pattern,
163        for example, /((?2){73}(?2))((?1))/. A better mutual recursion detection
164        method has been implemented. This infelicity was discovered by the LLVM
165        fuzzer.
166    
167    40. Static linking against the PCRE library using the pkg-config module was
168        failing on missing pthread symbols.
169    
170    
171    Version 8.36 26-September-2014
172    ------------------------------
173    
174    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
175        -Wmissing-field-initializers and -Wunused-parameter.
176    
177    2.  The tests for quantifiers being too big (greater than 65535) were being
178        applied after reading the number, and stupidly assuming that integer
179        overflow would give a negative number. The tests are now applied as the
180        numbers are read.
181    
182    3.  Tidy code in pcre_exec.c where two branches that used to be different are
183        now the same.
184    
185    4.  The JIT compiler did not generate match limit checks for certain
186        bracketed expressions with quantifiers. This may lead to exponential
187        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
188        issue should be resolved now.
189    
190    5.  Fixed an issue, which occures when nested alternatives are optimized
191        with table jumps.
192    
193    6.  Inserted two casts and changed some ints to size_t in the light of some
194        reported 64-bit compiler warnings (Bugzilla 1477).
195    
196    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
197        an empty string, which sometimes were behaving incorrectly in the
198        interpreter (though correctly in the JIT matcher). This pcretest input is
199        an example:
200    
201          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
202          NON QUOTED "QUOT""ED" AFTER "NOT MATCHED
203    
204        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
205        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
206        for an empty string was breaking the inner loop and carrying on at a lower
207        level, when possessive repeated groups should always return to a higher
208        level as they have no backtrack points in them. The empty string test now
209        occurs at the outer level.
210    
211    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
212        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
213    
214    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
215        doesn't).
216    
217    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
218        to hold a pattern to be incorrectly computed (too small) when there were
219        named back references to duplicated names. This could cause "internal
220        error: code overflow" or "double free or corruption" or other memory
221        handling errors.
222    
223    11. When named subpatterns had the same prefixes, back references could be
224        confused. For example, in this pattern:
225    
226          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
227    
228        the reference to 'Name' was incorrectly treated as a reference to a
229        duplicate name.
230    
231    12. A pattern such as /^s?c/mi8 where the optional character has more than
232        one "other case" was incorrectly compiled such that it would only try to
233        match starting at "c".
234    
235    13. When a pattern starting with \s was studied, VT was not included in the
236        list of possible starting characters; this should have been part of the
237        8.34/18 patch.
238    
239    14. If a character class started [\Qx]... where x is any character, the class
240        was incorrectly terminated at the ].
241    
242    15. If a pattern that started with a caseless match for a character with more
243        than one "other case" was studied, PCRE did not set up the starting code
244        unit bit map for the list of possible characters. Now it does. This is an
245        optimization improvement, not a bug fix.
246    
247    16. The Unicode data tables have been updated to Unicode 7.0.0.
248    
249    17. Fixed a number of memory leaks in pcregrep.
250    
251    18. Avoid a compiler warning (from some compilers) for a function call with
252        a cast that removes "const" from an lvalue by using an intermediate
253        variable (to which the compiler does not object).
254    
255    19. Incorrect code was compiled if a group that contained an internal recursive
256        back reference was optional (had quantifier with a minimum of zero). This
257        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
258        caused segmentation faults because of stack overflows at compile time.
259    
260    20. A pattern such as /((?(R)a|(?1)))+/, which contains a recursion within a
261        group that is quantified with an indefinite repeat, caused a compile-time
262        loop which used up all the system stack and provoked a segmentation fault.
263        This was not the same bug as 19 above.
264    
265    21. Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.
266        Patch by Mike Frysinger.
267    
268    
269    Version 8.35 04-April-2014
270    --------------------------
271    
272    1.  A new flag is set, when property checks are present in an XCLASS.
273        When this flag is not set, PCRE can perform certain optimizations
274        such as studying these XCLASS-es.
275    
276    2.  The auto-possessification of character sets were improved: a normal
277        and an extended character set can be compared now. Furthermore
278        the JIT compiler optimizes more character set checks.
279    
280    3.  Got rid of some compiler warnings for potentially uninitialized variables
281        that show up only when compiled with -O2.
282    
283    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
284        of a match later then the end of the match. The pcretest program was not
285        handling the case sensibly - it was outputting from the start to the next
286        binary zero. It now reports this situation in a message, and outputs the
287        text from the end to the start.
288    
289    5.  Fast forward search is improved in JIT. Instead of the first three
290        characters, any three characters with fixed position can be searched.
291        Search order: first, last, middle.
292    
293    6.  Improve character range checks in JIT. Characters are read by an inprecise
294        function now, which returns with an unknown value if the character code is
295        above a certain threshold (e.g: 256). The only limitation is that the value
296        must be bigger than the threshold as well. This function is useful when
297        the characters above the threshold are handled in the same way.
298    
299    7.  The macros whose names start with RAWUCHAR are placeholders for a future
300        mode in which only the bottom 21 bits of 32-bit data items are used. To
301        make this more memorable for those maintaining the code, the names have
302        been changed to start with UCHAR21, and an extensive comment has been added
303        to their definition.
304    
305    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
306        to the export list in Makefile.am (they were accidentally omitted from the
307        8.34 tarball).
308    
309    9.  The informational output from pcretest used the phrase "starting byte set"
310        which is inappropriate for the 16-bit and 32-bit libraries. As the output
311        for "first char" and "need char" really means "non-UTF-char", I've changed
312        "byte" to "char", and slightly reworded the output. The documentation about
313        these values has also been (I hope) clarified.
314    
315    10. Another JIT related optimization: use table jumps for selecting the correct
316        backtracking path, when more than four alternatives are present inside a
317        bracket.
318    
319    11. Empty match is not possible, when the minimum length is greater than zero,
320        and there is no \K in the pattern. JIT should avoid empty match checks in
321        such cases.
322    
323    12. In a caseless character class with UCP support, when a character with more
324        than one alternative case was not the first character of a range, not all
325        the alternative cases were added to the class. For example, s and \x{17f}
326        are both alternative cases for S: the class [RST] was handled correctly,
327        but [R-T] was not.
328    
329    13. The configure.ac file always checked for pthread support when JIT was
330        enabled. This is not used in Windows, so I have put this test inside a
331        check for the presence of windows.h (which was already tested for).
332    
333    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
334        The algorithm provides a way to skip certain starting offsets, and usually
335        faster than linear prefix searches.
336    
337    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
338        as for 'fr_FR' and 'french'. For some reason, however, it then used the
339        Windows-specific input and output files, which have 'french' screwed in.
340        So this could never have worked. One of the problems with locales is that
341        they aren't always the same. I have now updated RunTest so that it checks
342        the output of the locale test (test 3) against three different output
343        files, and it allows the test to pass if any one of them matches. With luck
344        this should make the test pass on some versions of Solaris where it was
345        failing. Because of the uncertainty, the script did not used to stop if
346        test 3 failed; it now does. If further versions of a French locale ever
347        come to light, they can now easily be added.
348    
349    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
350        there was a message during ./configure, but it did not stop. This now
351        provokes an error. The invalid example in README has been corrected.
352        If a value less than the minimum is given, the minimum value has always
353        been used, but now a warning is given.
354    
355    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
356        was a bug in the test system, which is now fixed. Also, the list of various
357        configurations that are tested for each release did not have one with both
358        16/32 bits and --enable-bar-anycrlf. It now does.
359    
360    18. pcretest was missing "-C bsr" for displaying the \R default setting.
361    
362    19. Little endian PowerPC systems are supported now by the JIT compiler.
363    
364    20. The fast forward newline mechanism could enter to an infinite loop on
365        certain invalid UTF-8 input. Although we don't support these cases
366        this issue can be fixed by a performance optimization.
367    
368    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
369        not take account if existing stack usage. There is now a new global
370        variable called pcre_stack_guard that can be set to point to an external
371        function to check stack availability. It is called at the start of
372        processing every parenthesized group.
373    
374    22. A typo in the code meant that in ungreedy mode the max/min qualifier
375        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
376        not match "ab".
377    
378    23. When UTF was disabled, the JIT program reported some incorrect compile
379        errors. These messages are silenced now.
380    
381    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
382        compiler.
383    
384    25. Change all the temporary files used in RunGrepTest to be different to those
385        used by RunTest so that the tests can be run simultaneously, for example by
386        "make -j check".
387    
388    
389    Version 8.34 15-December-2013
390    -----------------------------
391    
392    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
393        executable memory. Patch inspired by Carsten Klein.
394    
395    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
396        this macro is never tested and has no effect, because the work to support
397        coverage involves only compiling and linking options and special targets in
398        the Makefile. The comment in config.h implied that defining the macro would
399        enable coverage support, which is totally false. There was also support for
400        setting this macro in the CMake files (my fault, I just copied it from
401        configure). SUPPORT_GCOV has now been removed.
402    
403    3.  Make a small performance improvement in strlen16() and strlen32() in
404        pcretest.
405    
406    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
407        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
408        these cases). There was also one in pcretest.c.
409    
410    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
411    
412    6.  In UTF mode, the code for checking whether a group could match an empty
413        string (which is used for indefinitely repeated groups to allow for
414        breaking an infinite loop) was broken when the group contained a repeated
415        negated single-character class with a character that occupied more than one
416        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
417        UTF-8 mode). The effect was undefined: the group might or might not be
418        deemed as matching an empty string, or the program might have crashed.
419    
420    7.  The code for checking whether a group could match an empty string was not
421        recognizing that \h, \H, \v, \V, and \R must match a character.
422    
423    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
424        an empty string. If it can, pcretest shows this in its information output.
425    
426    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
427        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
428        matched by pcre_exec() without using JIT:
429    
430        (a) If the rest of the pattern did not match after a maximal run of
431            grapheme clusters, the code for backing up to try with fewer of them
432            did not always back up over a full grapheme when characters that do not
433            have the modifier quality were involved, e.g. Hangul syllables.
434    
435        (b) If the match point in a subject started with modifier character, and
436            there was no match, the code could incorrectly back up beyond the match
437            point, and potentially beyond the first character in the subject,
438            leading to a segfault or an incorrect match result.
439    
440    10. A conditional group with an assertion condition could lead to PCRE
441        recording an incorrect first data item for a match if no other first data
442        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
443        first data item, and therefore matched "ca" after "c" instead of at the
444        start.
445    
446    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
447        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
448    
449    12. The source of pcregrep now includes z/OS-specific code so that it can be
450        compiled for z/OS as part of the special z/OS distribution.
451    
452    13. Added the -T and -TM options to pcretest.
453    
454    14. The code in pcre_compile.c for creating the table of named capturing groups
455        has been refactored. Instead of creating the table dynamically during the
456        actual compiling pass, the information is remembered during the pre-compile
457        pass (on the stack unless there are more than 20 named groups, in which
458        case malloc() is used) and the whole table is created before the actual
459        compile happens. This has simplified the code (it is now nearly 150 lines
460        shorter) and prepared the way for better handling of references to groups
461        with duplicate names.
462    
463    15. A back reference to a named subpattern when there is more than one of the
464        same name now checks them in the order in which they appear in the pattern.
465        The first one that is set is used for the reference. Previously only the
466        first one was inspected. This change makes PCRE more compatible with Perl.
467    
468    16. Unicode character properties were updated from Unicode 6.3.0.
469    
470    17. The compile-time code for auto-possessification has been refactored, based
471        on a patch by Zoltan Herczeg. It now happens after instead of during
472        compilation. The code is cleaner, and more cases are handled. The option
473        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
474        options in pcretest are provided to set it. It can also be set by
475        (*NO_AUTO_POSSESS) at the start of a pattern.
476    
477    18. The character VT has been added to the default ("C" locale) set of
478        characters that match \s and are generally treated as white space,
479        following this same change in Perl 5.18. There is now no difference between
480        "Perl space" and "POSIX space". Whether VT is treated as white space in
481        other locales depends on the locale.
482    
483    19. The code for checking named groups as conditions, either for being set or
484        for being recursed, has been refactored (this is related to 14 and 15
485        above). Processing unduplicated named groups should now be as fast at
486        numerical groups, and processing duplicated groups should be faster than
487        before.
488    
489    20. Two patches to the CMake build system, by Alexander Barkov:
490    
491          (1) Replace the "source" command by "." in CMakeLists.txt because
492              "source" is a bash-ism.
493    
494          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
495              without these the CMake build does not work on Solaris.
496    
497    21. Perl has changed its handling of \8 and \9. If there is no previously
498        encountered capturing group of those numbers, they are treated as the
499        literal characters 8 and 9 instead of a binary zero followed by the
500        literals. PCRE now does the same.
501    
502    22. Following Perl, added \o{} to specify codepoints in octal, making it
503        possible to specify values greater than 0777 and also making them
504        unambiguous.
505    
506    23. Perl now gives an error for missing closing braces after \x{... instead of
507        treating the string as literal. PCRE now does the same.
508    
509    24. RunTest used to grumble if an inappropriate test was selected explicitly,
510        but just skip it when running all tests. This make it awkward to run ranges
511        of tests when one of them was inappropriate. Now it just skips any
512        inappropriate tests, as it always did when running all tests.
513    
514    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
515        character types such as \d or \w, too many callouts were inserted, and the
516        data that they returned was rubbish.
517    
518    26. In UCP mode, \s was not matching two of the characters that Perl matches,
519        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
520        were matched by \h. The code has now been refactored so that the lists of
521        the horizontal and vertical whitespace characters used for \h and \v (which
522        are defined only in one place) are now also used for \s.
523    
524    27. Add JIT support for the 64 bit TileGX architecture.
525        Patch by Jiong Wang (Tilera Corporation).
526    
527    28. Possessive quantifiers for classes (both explicit and automatically
528        generated) now use special opcodes instead of wrapping in ONCE brackets.
529    
530    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
531        (because it's meaningless), this was not happening when PCRE_CASELESS was
532        set. Not wrong, but inefficient.
533    
534    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
535        properties for \w, \d, etc) is present in a test regex. Otherwise if the
536        test contains no characters greater than 255, Perl doesn't realise it
537        should be using Unicode semantics.
538    
539    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
540        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
541        does in Unicode mode.
542    
543    32. Added the "forbid" facility to pcretest so that putting tests into the
544        wrong test files can sometimes be quickly detected.
545    
546    33. There is now a limit (default 250) on the depth of nesting of parentheses.
547        This limit is imposed to control the amount of system stack used at compile
548        time. It can be changed at build time by --with-parens-nest-limit=xxx or
549        the equivalent in CMake.
550    
551    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
552        errors. Perl warns for these when in warning mode, but PCRE has no facility
553        for giving warnings.
554    
555    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
556        However, this was not working for (?!) because it is optimized to (*FAIL),
557        for which PCRE does not allow quantifiers. The optimization is now disabled
558        when a quantifier follows (?!). I can't see any use for this, but it makes
559        things uniform.
560    
561    36. Perl no longer allows group names to start with digits, so I have made this
562        change also in PCRE. It simplifies the code a bit.
563    
564    37. In extended mode, Perl ignores spaces before a + that indicates a
565        possessive quantifier. PCRE allowed a space before the quantifier, but not
566        before the possessive +. It now does.
567    
568    38. The use of \K (reset reported match start) within a repeated possessive
569        group such as (a\Kb)*+ was not working.
570    
571    40. Document that the same character tables must be used at compile time and
572        run time, and that the facility to pass tables to pcre_exec() and
573        pcre_dfa_exec() is for use only with saved/restored patterns.
574    
575    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
576        features for Builds with MSVC:
577    
578        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
579           builds). The .rc files can be used to set FileDescription and many other
580           attributes.
581    
582        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
583           This allows higher-level build scripts which want .pdb files to avoid
584           hard-coding the exact files needed."
585    
586    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
587        mean "start of word" and "end of word", respectively, as a transition aid.
588    
589    43. A minimizing repeat of a class containing codepoints greater than 255 in
590        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
591        compiled to use the heap for recursion.
592    
593    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
594        is configured.
595    
596    
597    Version 8.33 28-May-2013
598    ------------------------
599    
600    1.  Added 'U' to some constants that are compared to unsigned integers, to
601        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
602        variables that are added to signed variables, to ensure the result is
603        signed and can be negated.
604    
605    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
606        CMake config files.
607    
608    3.  Revise the creation of config.h.generic so that all boolean macros are
609        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
610        overriding via -D on the command line possible.
611    
612    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
613        to unsigned int is reported to make a quite noticeable speed difference in
614        a specific Windows environment. Testing on Linux did also appear to show
615        some benefit (and it is clearly not harmful). Also fixed the definition of
616        Xop which should be unsigned.
617    
618    5.  Related to (4), changing the definition of the intermediate variable cc
619        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
620        improvements.
621    
622    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
623        unnecessary spaces.
624    
625    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
626        and later.
627    
628    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
629    
630    9.  Optimizing fast_forward_start_bits in JIT.
631    
632    10. Adding support for callouts in JIT, and fixing some issues revealed
633        during this work. Namely:
634    
635        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
636    
637        (b) Minimum length was not checked before the matching is started.
638    
639    11. The value of capture_last that is passed to callouts was incorrect in some
640        cases when there was a capture on one path that was subsequently abandoned
641        after a backtrack. Also, the capture_last value is now reset after a
642        recursion, since all captures are also reset in this case.
643    
644    12. The interpreter no longer returns the "too many substrings" error in the
645        case when an overflowing capture is in a branch that is subsequently
646        abandoned after a backtrack.
647    
648    13. In the pathological case when an offset vector of size 2 is used, pcretest
649        now prints out the matched string after a yield of 0 or 1.
650    
651    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
652        Only supported by the JIT compiler at the moment.
653    
654    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
655    
656    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
657        offset of the starting point of the matching process, provided the offsets
658        vector is large enough.
659    
660    17. The \A escape now records a lookbehind value of 1, though its execution
661        does not actually inspect the previous character. This is to ensure that,
662        in partial multi-segment matching, at least one character from the old
663        segment is retained when a new segment is processed. Otherwise, if there
664        are no lookbehinds in the pattern, \A might match incorrectly at the start
665        of a new segment.
666    
667    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
668    
669    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
670        gives some modest performance improvement in 8-bit mode.
671    
672    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
673        be expressed in certain programming languages using Universal Character
674        Names.
675    
676    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
677        which points out that "non characters" are not "characters that may not
678        appear in Unicode strings" but rather "characters that are reserved for
679        internal use and have only local meaning".
680    
681    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
682        there was a conditional group that depended on an assertion, if the
683        assertion was false, the callout that immediately followed the alternation
684        in the condition was skipped when pcre_exec() was used for matching.
685    
686    23. Allow an explicit callout to be inserted before an assertion that is the
687        condition for a conditional group, for compatibility with automatic
688        callouts, which always insert a callout at this point.
689    
690    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
691        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
692    
693    25. (*PRUNE) is now supported by the JIT compiler.
694    
695    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
696    
697    27. Fix the case where there are two or more SKIPs with arguments that may be
698        ignored.
699    
700    28. (*SKIP) is now supported by the JIT compiler.
701    
702    29. (*THEN) is now supported by the JIT compiler.
703    
704    30. Update RunTest with additional test selector options.
705    
706    31. The way PCRE handles backtracking verbs has been changed in two ways.
707    
708        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
709        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
710        backtracking. In some cases this makes it more Perl-compatible, but Perl's
711        rather obscure rules do not always do the same thing.
712    
713        (2) Previously, backtracking verbs were confined within assertions. This is
714        no longer the case for positive assertions, except for (*ACCEPT). Again,
715        this sometimes improves Perl compatibility, and sometimes does not.
716    
717    32. A number of tests that were in test 2 because Perl did things differently
718        have been moved to test 1, because either Perl or PCRE has changed, and
719        these tests are now compatible.
720    
721    32. Backtracking control verbs are now handled in the same way in JIT and
722        interpreter.
723    
724    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
725        contained a forward subroutine reference caused a compile error.
726    
727    34. Auto-detect and optimize limited repetitions in JIT.
728    
729    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
730        blocking (*UTF) etc.
731    
732    36. In the interpreter, maximizing pattern repetitions for characters and
733        character types now use tail recursion, which reduces stack usage.
734    
735    37. The value of the max lookbehind was not correctly preserved if a compiled
736        and saved regex was reloaded on a host of different endianness.
737    
738    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
739        of the compiled pattern block, expand the flags field from 16 to 32 bits
740        because it was almost full.
741    
742    39. Try madvise first before posix_madvise.
743    
744    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
745        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
746        original change locked out all matches of empty strings. This has been
747        changed so that one match of an empty string per line is recognized.
748        Subsequent searches on the same line (for colouring or for --only-matching,
749        for example) do not recognize empty strings.
750    
751    41. Applied a user patch to fix a number of spelling mistakes in comments.
752    
753    42. Data lines longer than 65536 caused pcretest to crash.
754    
755    43. Clarified the data type for length and startoffset arguments for pcre_exec
756        and pcre_dfa_exec in the function-specific man pages, where they were
757        explicitly stated to be in bytes, never having been updated. I also added
758        some clarification to the pcreapi man page.
759    
760    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
761        a segmentation fault.
762    
763    
764    Version 8.32 30-November-2012
765    -----------------------------
766    
767    1.  Improved JIT compiler optimizations for first character search and single
768        character iterators.
769    
770    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
771        Patch by Daniel Richard G.
772    
773    3.  Single character iterator optimizations in the JIT compiler.
774    
775    4.  Improved JIT compiler optimizations for character ranges.
776    
777    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
778        Reported by Giuseppe D'Angelo.
779    
780    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
781        of a line, was being set incorrectly in cases where .* appeared inside
782        atomic brackets at the start of a pattern, or where there was a subsequent
783        *PRUNE or *SKIP.
784    
785    7.  Improved instruction cache flush for POWER/PowerPC.
786        Patch by Daniel Richard G.
787    
788    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
789        grep:
790    
791        (a) There is now no limit to the number of patterns to be matched.
792    
793        (b) An error is given if a pattern is too long.
794    
795        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
796            are now supported.
797    
798        (d) --exclude-from and --include-from (multiple use) have been added.
799    
800        (e) Exclusions and inclusions now apply to all files and directories, not
801            just to those obtained from scanning a directory recursively.
802    
803        (f) Multiple uses of -f and --file-list are now supported.
804    
805        (g) In a Windows environment, the default for -d has been changed from
806            "read" (the GNU grep default) to "skip", because otherwise the presence
807            of a directory in the file list provokes an error.
808    
809        (h) The documentation has been revised and clarified in places.
810    
811    9.  Improve the matching speed of capturing brackets.
812    
813    10. Changed the meaning of \X so that it now matches a Unicode extended
814        grapheme cluster.
815    
816    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
817        out POSIX threads when JIT support is configured.
818    
819    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
820    
821    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
822        structure could go wrong in environments where size_t is not the same size
823        as int.
824    
825    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
826        set.
827    
828    15. The EBCDIC support had decayed; later updates to the code had included
829        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
830        general tidy up of EBCDIC-related issues, and the documentation was also
831        not quite right. There is now a test that can be run on ASCII systems to
832        check some of the EBCDIC-related things (but is it not a full test).
833    
834    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
835        in a small tidy to the code.
836    
837    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
838    
839    18. If the --only-matching (-o) option in pcregrep is specified multiple
840        times, each one causes appropriate output. For example, -o1 -o2 outputs the
841        substrings matched by the 1st and 2nd capturing parentheses. A separating
842        string can be specified by --om-separator (default empty).
843    
844    19. Improving the first n character searches.
845    
846    20. Turn case lists for horizontal and vertical white space into macros so that
847        they are defined only once.
848    
849    21. This set of changes together give more compatible Unicode case-folding
850        behaviour for characters that have more than one other case when UCP
851        support is available.
852    
853        (a) The Unicode property table now has offsets into a new table of sets of
854            three or more characters that are case-equivalent. The MultiStage2.py
855            script that generates these tables (the pcre_ucd.c file) now scans
856            CaseFolding.txt instead of UnicodeData.txt for character case
857            information.
858    
859        (b) The code for adding characters or ranges of characters to a character
860            class has been abstracted into a generalized function that also handles
861            case-independence. In UTF-mode with UCP support, this uses the new data
862            to handle characters with more than one other case.
863    
864        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
865            whose other case is greater than 256 are now correctly matched
866            caselessly. Previously, the high codepoint matched the low one, but not
867            vice versa.
868    
869        (d) The processing of \h, \H, \v, and \ in character classes now makes use
870            of the new class addition function, using character lists defined as
871            macros alongside the case definitions of 20 above.
872    
873        (e) Caseless back references now work with characters that have more than
874            one other case.
875    
876        (f) General caseless matching of characters with more than one other case
877            is supported.
878    
879    22. Unicode character properties were updated from Unicode 6.2.0
880    
881    23. Improved CMake support under Windows. Patch by Daniel Richard G.
882    
883    24. Add support for 32-bit character strings, and UTF-32
884    
885    25. Major JIT compiler update (code refactoring and bugfixing).
886        Experimental Sparc 32 support is added.
887    
888    26. Applied a modified version of Daniel Richard G's patch to create
889        pcre.h.generic and config.h.generic by "make" instead of in the
890        PrepareRelease script.
891    
892    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
893        pcre_compile.c when checking for a zero character.
894    
895    28. Introducing a native interface for JIT. Through this interface, the compiled
896        machine code can be directly executed. The purpose of this interface is to
897        provide fast pattern matching, so several sanity checks are not performed.
898        However, feature tests are still performed. The new interface provides
899        1.4x speedup compared to the old one.
900    
901    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
902        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
903        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
904    
905    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
906        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
907        the "old" RFC 2279). Instead, it ended up passing a negative length to
908        pcre_exec().
909    
910    31. Add support for GCC's visibility feature to hide internal functions.
911    
912    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
913        "unknown -C option" after outputting 0 or 1.
914    
915    33. There is now support for generating a code coverage report for the test
916        suite in environments where gcc is the compiler and lcov is installed. This
917        is mainly for the benefit of the developers.
918    
919    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
920        unaddressable using valgrind annotations, allowing valgrind to detect
921        invalid memory accesses. This is mainly for the benefit of the developers.
922    
923    25. (*UTF) can now be used to start a pattern in any of the three libraries.
924    
925    26. Give configure error if --enable-cpp but no C++ compiler found.
926    
927    
928    Version 8.31 06-July-2012
929    -------------------------
930    
931    1.  Fixing a wrong JIT test case and some compiler warnings.
932    
933    2.  Removed a bashism from the RunTest script.
934    
935    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
936        to unsigned type, result still unsigned" that was given by an MS compiler
937        on encountering the code "-sizeof(xxx)".
938    
939    4.  Partial matching support is added to the JIT compiler.
940    
941    5.  Fixed several bugs concerned with partial matching of items that consist
942        of more than one character:
943    
944        (a) /^(..)\1/ did not partially match "aba" because checking references was
945            done on an "all or nothing" basis. This also applied to repeated
946            references.
947    
948        (b) \R did not give a hard partial match if \r was found at the end of the
949            subject.
950    
951        (c) \X did not give a hard partial match after matching one or more
952            characters at the end of the subject.
953    
954        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
955            a partial match for the string "\r".
956    
957        (e) When newline was set to CRLF, the metacharacter "." did not recognize
958            a partial match for a CR character at the end of the subject string.
959    
960    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
961        running pcretest, the text "(JIT)" added to the output whenever JIT is
962        actually used to run the match.
963    
964    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
965        or /S+[+] with a digit between 1 and 7.
966    
967    8.  OP_NOT now supports any UTF character not just single-byte ones.
968    
969    9.  (*MARK) control verb is now supported by the JIT compiler.
970    
971    10. The command "./RunTest list" lists the available tests without actually
972        running any of them. (Because I keep forgetting what they all are.)
973    
974    11. Add PCRE_INFO_MAXLOOKBEHIND.
975    
976    12. Applied a (slightly modified) user-supplied patch that improves performance
977        when the heap is used for recursion (compiled with --disable-stack-for-
978        recursion). Instead of malloc and free for each heap frame each time a
979        logical recursion happens, frames are retained on a chain and re-used where
980        possible. This sometimes gives as much as 30% improvement.
981    
982    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
983        call.
984    
985    14. As documented, (*COMMIT) is now confined to within a positive assertion.
986    
987    15. It is now possible to link pcretest with libedit as an alternative to
988        libreadline.
989    
990    16. (*COMMIT) control verb is now supported by the JIT compiler.
991    
992    17. The Unicode data tables have been updated to Unicode 6.1.0.
993    
994    18. Added --file-list option to pcregrep.
995    
996    19. Added binary file support to pcregrep, including the -a, --binary-files,
997        -I, and --text options.
998    
999    20. The madvise function is renamed for posix_madvise for QNX compatibility
1000        reasons. Fixed by Giuseppe D'Angelo.
1001    
1002    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
1003    
1004    22. Changed the option for creating symbolic links for 16-bit man pages from
1005        -s to -sf so that re-installing does not cause issues.
1006    
1007    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
1008    
1009    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
1010        matches in certain environments (the workspace was not being correctly
1011        retained). Also added to pcre_dfa_exec() a simple plausibility check on
1012        some of the workspace data at the beginning of a restart.
1013    
1014    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
1015        was not doing so when it should - probably a typo introduced by SVN 528
1016        (change 8.10/14).
1017    
1018    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
1019        \w+ when the character tables indicated that \x{c4} was a word character.
1020        There were several related cases, all because the tests for doing a table
1021        lookup were testing for characters less than 127 instead of 255.
1022    
1023    27. If a pattern contains capturing parentheses that are not used in a match,
1024        their slots in the ovector are set to -1. For those that are higher than
1025        any matched groups, this happens at the end of processing. In the case when
1026        there were back references that the ovector was too small to contain
1027        (causing temporary malloc'd memory to be used during matching), and the
1028        highest capturing number was not used, memory off the end of the ovector
1029        was incorrectly being set to -1. (It was using the size of the temporary
1030        memory instead of the true size.)
1031    
1032    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
1033        ovector size, it uses memory at the end of the block that it has got.
1034    
1035    29. Check for an overlong MARK name and give an error at compile time. The
1036        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
1037    
1038    30. JIT compiler update.
1039    
1040    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
1041        Rill for the patch.
1042    
1043    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
1044    
1045    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
1046    
1047    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
1048        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
1049        was enabled.
1050    
1051    35. Improve JIT code generation for greedy plus quantifier.
1052    
1053    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
1054        1 to "aa" instead of to an empty string. The bug affected repeated groups
1055        that could potentially match an empty string.
1056    
1057    37. Optimizing single character iterators in JIT.
1058    
1059    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
1060        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
1061        codepoints that are too big for the mode are faulted, and in a UTF mode,
1062        disallowed codepoints are also faulted.
1063    
1064    39. If PCRE was compiled with UTF support, in three places in the DFA
1065        matcher there was code that should only have been obeyed in UTF mode, but
1066        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
1067        processing when bytes with values greater than 127 were present. In 16-bit
1068        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
1069        both cases the values are those that cannot be the first data item in a UTF
1070        character. The three items that might have provoked this were recursions,
1071        possessively repeated groups, and atomic groups.
1072    
1073    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
1074        and pcregrep, because some OS require shared objects to be explicitly
1075        passed to ld, causing the link step to fail if they are not.
1076    
1077    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
1078        mode, patterns that started with \h* or \R* might be incorrectly matched.
1079    
1080    
1081    Version 8.30 04-February-2012
1082    -----------------------------
1083    
1084    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
1085        name is defined in ctype.h.
1086    
1087    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
1088        only in quite long subpatterns.
1089    
1090    3.  Removed the function pcre_info(), which has been obsolete and deprecated
1091        since it was replaced by pcre_fullinfo() in February 2000.
1092    
1093    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
1094        match a (*MARK), and the match failed at the start of the subject, a
1095        reference to memory before the start of the subject could occur. This bug
1096        was introduced by fix 17 of release 8.21.
1097    
1098    5.  A reference to an unset group with zero minimum repetition was giving
1099        totally wrong answers (in non-JavaScript-compatibility mode). For example,
1100        /(another)?(\1?)test/ matched against "hello world test". This bug was
1101        introduced in release 8.13.
1102    
1103    6.  Add support for 16-bit character strings (a large amount of work involving
1104        many changes and refactorings).
1105    
1106    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
1107        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
1108        from a file.
1109    
1110    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
1111        rounding is not applied in this particular case).
1112    
1113    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
1114        if they appear, or are escaped, in patterns.
1115    
1116    10. Get rid of a number of -Wunused-but-set-variable warnings.
1117    
1118    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
1119        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
1120        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
1121        also returns the mark "x". This bug applied to capturing parentheses,
1122        non-capturing parentheses, and atomic parentheses. It also applied to some
1123        assertions.
1124    
1125    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
1126        information out of configure.ac instead of relying on pcre.h.generic, which
1127        is not stored in the repository.
1128    
1129    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
1130        -lreadline.
1131    
1132    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
1133    
1134    15. Applied Graycode's patch to put the top-level frame on the stack rather
1135        than the heap when not using the stack for recursion. This gives a
1136        performance improvement in many cases when recursion is not deep.
1137    
1138    16. Experimental code added to "pcretest -C" to output the stack frame size.
1139    
1140    
1141    Version 8.21 12-Dec-2011
1142    ------------------------
1143    
1144  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
1145    
# Line 13  Version 8.21 Line 1150  Version 8.21
1150      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
1151      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
1152    
1153  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
1154      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
1155      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
1156    
1157  5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the  5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
1158      ECMA-262 standard.      ECMA-262 standard.
1159    
1160    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
1161        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
1162        This bug was probably introduced by change 9 of 8.13.
1163    
1164    7.  While fixing 6 above, I noticed that a number of other items were being
1165        incorrectly rejected as "not fixed length". This arose partly because newer
1166        opcodes had not been added to the fixed-length checking code. I have (a)
1167        corrected the bug and added tests for these items, and (b) arranged for an
1168        error to occur if an unknown opcode is encountered while checking for fixed
1169        length instead of just assuming "not fixed length". The items that were
1170        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
1171        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
1172        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
1173    
1174    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
1175        being incorrectly compiled and would have given unpredicatble results.
1176    
1177    9.  A possessively repeated subpattern with minimum repeat count greater than
1178        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
1179        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
1180        the first (A) could occur when it should not.
1181    
1182    10. Add a cast and remove a redundant test from the code.
1183    
1184    11. JIT should use pcre_malloc/pcre_free for allocation.
1185    
1186    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
1187        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
1188        is anything other than /usr, -L is still shown).
1189    
1190    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
1191    
1192    14. Perl does not support \N without a following name in a [] class; PCRE now
1193        also gives an error.
1194    
1195    15. If a forward reference was repeated with an upper limit of around 2000,
1196        it caused the error "internal error: overran compiling workspace". The
1197        maximum number of forward references (including repeats) was limited by the
1198        internal workspace, and dependent on the LINK_SIZE. The code has been
1199        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
1200        the default depends on LINK_SIZE. There is a new upper limit (for safety)
1201        of around 200,000 forward references. While doing this, I also speeded up
1202        the filling in of repeated forward references.
1203    
1204    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
1205        incorrectly expecting the subject to contain another "a" after the start.
1206    
1207    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
1208        in the match, the SKIP should be ignored. This was not happening; instead
1209        the SKIP was being treated as NOMATCH. For patterns such as
1210        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
1211        tested.
1212    
1213    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
1214        now much more compatible with Perl, in particular in cases where the result
1215        is a non-match for a non-anchored pattern. For example, if
1216        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
1217        "m", where previously it did not return a name. A side effect of this
1218        change is that for partial matches, the last encountered mark name is
1219        returned, as for non matches. A number of tests that were previously not
1220        Perl-compatible have been moved into the Perl-compatible test files. The
1221        refactoring has had the pleasing side effect of removing one argument from
1222        the match() function, thus reducing its stack requirements.
1223    
1224    19. If the /S+ option was used in pcretest to study a pattern using JIT,
1225        subsequent uses of /S (without +) incorrectly behaved like /S+.
1226    
1227    21. Retrieve executable code size support for the JIT compiler and fixing
1228        some warnings.
1229    
1230    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
1231        not work when the shorter character appeared right at the end of the
1232        subject string.
1233    
1234    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
1235        systems.
1236    
1237    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
1238        output it when the /M option is used in pcretest.
1239    
1240    25. The CheckMan script was not being included in the distribution. Also, added
1241        an explicit "perl" to run Perl scripts from the PrepareRelease script
1242        because this is reportedly needed in Windows.
1243    
1244    26. If study data was being save in a file and studying had not found a set of
1245        "starts with" bytes for the pattern, the data written to the file (though
1246        never used) was taken from uninitialized memory and so caused valgrind to
1247        complain.
1248    
1249    27. Updated RunTest.bat as provided by Sheri Pierce.
1250    
1251    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
1252    
1253    29. Computation of memory usage for the table of capturing group names was
1254        giving an unnecessarily large value.
1255    
1256    
1257  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
1258  ------------------------  ------------------------
# Line 1035  Version 7.9 11-Apr-09 Line 2268  Version 7.9 11-Apr-09
2268  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
2269      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
2270      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2271      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2272        8.33.]
2273    
2274  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
2275      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 1278  Version 7.7 07-May-08 Line 2512  Version 7.7 07-May-08
2512      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2513      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2514      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2515      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2516      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2517      was subsequently set up correctly.)      was subsequently set up correctly.)
2518    

Legend:
Removed from v.745  
changed lines
  Added in v.1553

  ViewVC Help
Powered by ViewVC 1.1.5