ViewVC logotype

Diff of /code/trunk/ChangeLog

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

revision 1033 by ph10, Mon Sep 10 11:02:48 2012 UTC revision 1539 by ph10, Sun Mar 29 15:44:40 2015 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.32  Version 8.37 xx-xxx-2015
5  ------------  ------------------------
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".
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.
17    3.  If a pattern in pcretest input had the P (POSIX) modifier followed by an
18        unrecognized modifier, a crash could occur.
20    4.  An attempt to do global matching in pcretest with a zero-length ovector
21        caused a crash.
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.
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.
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))/.
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.
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.
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).
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.
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.
68    13. Fixed two bugs in pcretest that were discovered by fuzzing and reported by
69        Red Hat Product Security:
71        (a) A crash if /K and /F were both set with the option to save the compiled
72        pattern.
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.
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.
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.
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.
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.
103    26. Fix JIT compilation of conditional blocks, which assertion
104        is converted to (*FAIL). E.g: /(?(?!))/.
106    27. The pattern /(?(?!)^)/ caused references to random memory. This bug was
107        discovered by the LLVM fuzzer.
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.
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.
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.
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.
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.
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.
141    Version 8.36 26-September-2014
142    ------------------------------
144    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
145        -Wmissing-field-initializers and -Wunused-parameter.
147    2.  The tests for quantifiers being too big (greater than 65535) were being
148        applied after reading the number, and stupidly assuming that integer
149        overflow would give a negative number. The tests are now applied as the
150        numbers are read.
152    3.  Tidy code in pcre_exec.c where two branches that used to be different are
153        now the same.
155    4.  The JIT compiler did not generate match limit checks for certain
156        bracketed expressions with quantifiers. This may lead to exponential
157        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
158        issue should be resolved now.
160    5.  Fixed an issue, which occures when nested alternatives are optimized
161        with table jumps.
163    6.  Inserted two casts and changed some ints to size_t in the light of some
164        reported 64-bit compiler warnings (Bugzilla 1477).
166    7.  Fixed a bug concerned with zero-minimum possessive groups that could match
167        an empty string, which sometimes were behaving incorrectly in the
168        interpreter (though correctly in the JIT matcher). This pcretest input is
169        an example:
171          '\A(?:[^"]++|"(?:[^"]*+|"")*+")++'
174        the interpreter was reporting a match of 'NON QUOTED ' only, whereas the
175        JIT matcher and Perl both matched 'NON QUOTED "QUOT""ED" AFTER '. The test
176        for an empty string was breaking the inner loop and carrying on at a lower
177        level, when possessive repeated groups should always return to a higher
178        level as they have no backtrack points in them. The empty string test now
179        occurs at the outer level.
181    8.  Fixed a bug that was incorrectly auto-possessifying \w+ in the pattern
182        ^\w+(?>\s*)(?<=\w) which caused it not to match "test test".
184    9.  Give a compile-time error for \o{} (as Perl does) and for \x{} (which Perl
185        doesn't).
187    10. Change 8.34/15 introduced a bug that caused the amount of memory needed
188        to hold a pattern to be incorrectly computed (too small) when there were
189        named back references to duplicated names. This could cause "internal
190        error: code overflow" or "double free or corruption" or other memory
191        handling errors.
193    11. When named subpatterns had the same prefixes, back references could be
194        confused. For example, in this pattern:
196          /(?P<Name>a)?(?P<Name2>b)?(?(<Name>)c|d)*l/
198        the reference to 'Name' was incorrectly treated as a reference to a
199        duplicate name.
201    12. A pattern such as /^s?c/mi8 where the optional character has more than
202        one "other case" was incorrectly compiled such that it would only try to
203        match starting at "c".
205    13. When a pattern starting with \s was studied, VT was not included in the
206        list of possible starting characters; this should have been part of the
207        8.34/18 patch.
209    14. If a character class started [\Qx]... where x is any character, the class
210        was incorrectly terminated at the ].
212    15. If a pattern that started with a caseless match for a character with more
213        than one "other case" was studied, PCRE did not set up the starting code
214        unit bit map for the list of possible characters. Now it does. This is an
215        optimization improvement, not a bug fix.
217    16. The Unicode data tables have been updated to Unicode 7.0.0.
219    17. Fixed a number of memory leaks in pcregrep.
221    18. Avoid a compiler warning (from some compilers) for a function call with
222        a cast that removes "const" from an lvalue by using an intermediate
223        variable (to which the compiler does not object).
225    19. Incorrect code was compiled if a group that contained an internal recursive
226        back reference was optional (had quantifier with a minimum of zero). This
227        example compiled incorrect code: /(((a\2)|(a*)\g<-1>))*/ and other examples
228        caused segmentation faults because of stack overflows at compile time.
230    20. A pattern such as /((?(R)a|(?1)))+/, which contains a recursion within a
231        group that is quantified with an indefinite repeat, caused a compile-time
232        loop which used up all the system stack and provoked a segmentation fault.
233        This was not the same bug as 19 above.
235    21. Add PCRECPP_EXP_DECL declaration to operator<< in pcre_stringpiece.h.
236        Patch by Mike Frysinger.
239    Version 8.35 04-April-2014
240    --------------------------
242    1.  A new flag is set, when property checks are present in an XCLASS.
243        When this flag is not set, PCRE can perform certain optimizations
244        such as studying these XCLASS-es.
246    2.  The auto-possessification of character sets were improved: a normal
247        and an extended character set can be compared now. Furthermore
248        the JIT compiler optimizes more character set checks.
250    3.  Got rid of some compiler warnings for potentially uninitialized variables
251        that show up only when compiled with -O2.
253    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
254        of a match later then the end of the match. The pcretest program was not
255        handling the case sensibly - it was outputting from the start to the next
256        binary zero. It now reports this situation in a message, and outputs the
257        text from the end to the start.
259    5.  Fast forward search is improved in JIT. Instead of the first three
260        characters, any three characters with fixed position can be searched.
261        Search order: first, last, middle.
263    6.  Improve character range checks in JIT. Characters are read by an inprecise
264        function now, which returns with an unknown value if the character code is
265        above a certain threshold (e.g: 256). The only limitation is that the value
266        must be bigger than the threshold as well. This function is useful when
267        the characters above the threshold are handled in the same way.
269    7.  The macros whose names start with RAWUCHAR are placeholders for a future
270        mode in which only the bottom 21 bits of 32-bit data items are used. To
271        make this more memorable for those maintaining the code, the names have
272        been changed to start with UCHAR21, and an extensive comment has been added
273        to their definition.
275    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
276        to the export list in Makefile.am (they were accidentally omitted from the
277        8.34 tarball).
279    9.  The informational output from pcretest used the phrase "starting byte set"
280        which is inappropriate for the 16-bit and 32-bit libraries. As the output
281        for "first char" and "need char" really means "non-UTF-char", I've changed
282        "byte" to "char", and slightly reworded the output. The documentation about
283        these values has also been (I hope) clarified.
285    10. Another JIT related optimization: use table jumps for selecting the correct
286        backtracking path, when more than four alternatives are present inside a
287        bracket.
289    11. Empty match is not possible, when the minimum length is greater than zero,
290        and there is no \K in the pattern. JIT should avoid empty match checks in
291        such cases.
293    12. In a caseless character class with UCP support, when a character with more
294        than one alternative case was not the first character of a range, not all
295        the alternative cases were added to the class. For example, s and \x{17f}
296        are both alternative cases for S: the class [RST] was handled correctly,
297        but [R-T] was not.
299    13. The configure.ac file always checked for pthread support when JIT was
300        enabled. This is not used in Windows, so I have put this test inside a
301        check for the presence of windows.h (which was already tested for).
303    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
304        The algorithm provides a way to skip certain starting offsets, and usually
305        faster than linear prefix searches.
307    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
308        as for 'fr_FR' and 'french'. For some reason, however, it then used the
309        Windows-specific input and output files, which have 'french' screwed in.
310        So this could never have worked. One of the problems with locales is that
311        they aren't always the same. I have now updated RunTest so that it checks
312        the output of the locale test (test 3) against three different output
313        files, and it allows the test to pass if any one of them matches. With luck
314        this should make the test pass on some versions of Solaris where it was
315        failing. Because of the uncertainty, the script did not used to stop if
316        test 3 failed; it now does. If further versions of a French locale ever
317        come to light, they can now easily be added.
319    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
320        there was a message during ./configure, but it did not stop. This now
321        provokes an error. The invalid example in README has been corrected.
322        If a value less than the minimum is given, the minimum value has always
323        been used, but now a warning is given.
325    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
326        was a bug in the test system, which is now fixed. Also, the list of various
327        configurations that are tested for each release did not have one with both
328        16/32 bits and --enable-bar-anycrlf. It now does.
330    18. pcretest was missing "-C bsr" for displaying the \R default setting.
332    19. Little endian PowerPC systems are supported now by the JIT compiler.
334    20. The fast forward newline mechanism could enter to an infinite loop on
335        certain invalid UTF-8 input. Although we don't support these cases
336        this issue can be fixed by a performance optimization.
338    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
339        not take account if existing stack usage. There is now a new global
340        variable called pcre_stack_guard that can be set to point to an external
341        function to check stack availability. It is called at the start of
342        processing every parenthesized group.
344    22. A typo in the code meant that in ungreedy mode the max/min qualifier
345        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
346        not match "ab".
348    23. When UTF was disabled, the JIT program reported some incorrect compile
349        errors. These messages are silenced now.
351    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
352        compiler.
354    25. Change all the temporary files used in RunGrepTest to be different to those
355        used by RunTest so that the tests can be run simultaneously, for example by
356        "make -j check".
359    Version 8.34 15-December-2013
360    -----------------------------
362    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
363        executable memory. Patch inspired by Carsten Klein.
365    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
366        this macro is never tested and has no effect, because the work to support
367        coverage involves only compiling and linking options and special targets in
368        the Makefile. The comment in config.h implied that defining the macro would
369        enable coverage support, which is totally false. There was also support for
370        setting this macro in the CMake files (my fault, I just copied it from
371        configure). SUPPORT_GCOV has now been removed.
373    3.  Make a small performance improvement in strlen16() and strlen32() in
374        pcretest.
376    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
377        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
378        these cases). There was also one in pcretest.c.
380    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
382    6.  In UTF mode, the code for checking whether a group could match an empty
383        string (which is used for indefinitely repeated groups to allow for
384        breaking an infinite loop) was broken when the group contained a repeated
385        negated single-character class with a character that occupied more than one
386        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
387        UTF-8 mode). The effect was undefined: the group might or might not be
388        deemed as matching an empty string, or the program might have crashed.
390    7.  The code for checking whether a group could match an empty string was not
391        recognizing that \h, \H, \v, \V, and \R must match a character.
393    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
394        an empty string. If it can, pcretest shows this in its information output.
396    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
397        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
398        matched by pcre_exec() without using JIT:
400        (a) If the rest of the pattern did not match after a maximal run of
401            grapheme clusters, the code for backing up to try with fewer of them
402            did not always back up over a full grapheme when characters that do not
403            have the modifier quality were involved, e.g. Hangul syllables.
405        (b) If the match point in a subject started with modifier character, and
406            there was no match, the code could incorrectly back up beyond the match
407            point, and potentially beyond the first character in the subject,
408            leading to a segfault or an incorrect match result.
410    10. A conditional group with an assertion condition could lead to PCRE
411        recording an incorrect first data item for a match if no other first data
412        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
413        first data item, and therefore matched "ca" after "c" instead of at the
414        start.
416    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
417        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
419    12. The source of pcregrep now includes z/OS-specific code so that it can be
420        compiled for z/OS as part of the special z/OS distribution.
422    13. Added the -T and -TM options to pcretest.
424    14. The code in pcre_compile.c for creating the table of named capturing groups
425        has been refactored. Instead of creating the table dynamically during the
426        actual compiling pass, the information is remembered during the pre-compile
427        pass (on the stack unless there are more than 20 named groups, in which
428        case malloc() is used) and the whole table is created before the actual
429        compile happens. This has simplified the code (it is now nearly 150 lines
430        shorter) and prepared the way for better handling of references to groups
431        with duplicate names.
433    15. A back reference to a named subpattern when there is more than one of the
434        same name now checks them in the order in which they appear in the pattern.
435        The first one that is set is used for the reference. Previously only the
436        first one was inspected. This change makes PCRE more compatible with Perl.
438    16. Unicode character properties were updated from Unicode 6.3.0.
440    17. The compile-time code for auto-possessification has been refactored, based
441        on a patch by Zoltan Herczeg. It now happens after instead of during
442        compilation. The code is cleaner, and more cases are handled. The option
443        PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
444        options in pcretest are provided to set it. It can also be set by
445        (*NO_AUTO_POSSESS) at the start of a pattern.
447    18. The character VT has been added to the default ("C" locale) set of
448        characters that match \s and are generally treated as white space,
449        following this same change in Perl 5.18. There is now no difference between
450        "Perl space" and "POSIX space". Whether VT is treated as white space in
451        other locales depends on the locale.
453    19. The code for checking named groups as conditions, either for being set or
454        for being recursed, has been refactored (this is related to 14 and 15
455        above). Processing unduplicated named groups should now be as fast at
456        numerical groups, and processing duplicated groups should be faster than
457        before.
459    20. Two patches to the CMake build system, by Alexander Barkov:
461          (1) Replace the "source" command by "." in CMakeLists.txt because
462              "source" is a bash-ism.
464          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
465              without these the CMake build does not work on Solaris.
467    21. Perl has changed its handling of \8 and \9. If there is no previously
468        encountered capturing group of those numbers, they are treated as the
469        literal characters 8 and 9 instead of a binary zero followed by the
470        literals. PCRE now does the same.
472    22. Following Perl, added \o{} to specify codepoints in octal, making it
473        possible to specify values greater than 0777 and also making them
474        unambiguous.
476    23. Perl now gives an error for missing closing braces after \x{... instead of
477        treating the string as literal. PCRE now does the same.
479    24. RunTest used to grumble if an inappropriate test was selected explicitly,
480        but just skip it when running all tests. This make it awkward to run ranges
481        of tests when one of them was inappropriate. Now it just skips any
482        inappropriate tests, as it always did when running all tests.
484    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
485        character types such as \d or \w, too many callouts were inserted, and the
486        data that they returned was rubbish.
488    26. In UCP mode, \s was not matching two of the characters that Perl matches,
489        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
490        were matched by \h. The code has now been refactored so that the lists of
491        the horizontal and vertical whitespace characters used for \h and \v (which
492        are defined only in one place) are now also used for \s.
494    27. Add JIT support for the 64 bit TileGX architecture.
495        Patch by Jiong Wang (Tilera Corporation).
497    28. Possessive quantifiers for classes (both explicit and automatically
498        generated) now use special opcodes instead of wrapping in ONCE brackets.
500    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
501        (because it's meaningless), this was not happening when PCRE_CASELESS was
502        set. Not wrong, but inefficient.
504    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
505        properties for \w, \d, etc) is present in a test regex. Otherwise if the
506        test contains no characters greater than 255, Perl doesn't realise it
507        should be using Unicode semantics.
509    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
510        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
511        does in Unicode mode.
513    32. Added the "forbid" facility to pcretest so that putting tests into the
514        wrong test files can sometimes be quickly detected.
516    33. There is now a limit (default 250) on the depth of nesting of parentheses.
517        This limit is imposed to control the amount of system stack used at compile
518        time. It can be changed at build time by --with-parens-nest-limit=xxx or
519        the equivalent in CMake.
521    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
522        errors. Perl warns for these when in warning mode, but PCRE has no facility
523        for giving warnings.
525    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
526        However, this was not working for (?!) because it is optimized to (*FAIL),
527        for which PCRE does not allow quantifiers. The optimization is now disabled
528        when a quantifier follows (?!). I can't see any use for this, but it makes
529        things uniform.
531    36. Perl no longer allows group names to start with digits, so I have made this
532        change also in PCRE. It simplifies the code a bit.
534    37. In extended mode, Perl ignores spaces before a + that indicates a
535        possessive quantifier. PCRE allowed a space before the quantifier, but not
536        before the possessive +. It now does.
538    38. The use of \K (reset reported match start) within a repeated possessive
539        group such as (a\Kb)*+ was not working.
541    40. Document that the same character tables must be used at compile time and
542        run time, and that the facility to pass tables to pcre_exec() and
543        pcre_dfa_exec() is for use only with saved/restored patterns.
545    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
546        features for Builds with MSVC:
548        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
549           builds). The .rc files can be used to set FileDescription and many other
550           attributes.
552        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
553           This allows higher-level build scripts which want .pdb files to avoid
554           hard-coding the exact files needed."
556    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
557        mean "start of word" and "end of word", respectively, as a transition aid.
559    43. A minimizing repeat of a class containing codepoints greater than 255 in
560        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
561        compiled to use the heap for recursion.
563    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
564        is configured.
567    Version 8.33 28-May-2013
568    ------------------------
570    1.  Added 'U' to some constants that are compared to unsigned integers, to
571        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
572        variables that are added to signed variables, to ensure the result is
573        signed and can be negated.
575    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
576        CMake config files.
578    3.  Revise the creation of config.h.generic so that all boolean macros are
579        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
580        overriding via -D on the command line possible.
582    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
583        to unsigned int is reported to make a quite noticeable speed difference in
584        a specific Windows environment. Testing on Linux did also appear to show
585        some benefit (and it is clearly not harmful). Also fixed the definition of
586        Xop which should be unsigned.
588    5.  Related to (4), changing the definition of the intermediate variable cc
589        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
590        improvements.
592    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
593        unnecessary spaces.
595    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
596        and later.
598    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
600    9.  Optimizing fast_forward_start_bits in JIT.
602    10. Adding support for callouts in JIT, and fixing some issues revealed
603        during this work. Namely:
605        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
607        (b) Minimum length was not checked before the matching is started.
609    11. The value of capture_last that is passed to callouts was incorrect in some
610        cases when there was a capture on one path that was subsequently abandoned
611        after a backtrack. Also, the capture_last value is now reset after a
612        recursion, since all captures are also reset in this case.
614    12. The interpreter no longer returns the "too many substrings" error in the
615        case when an overflowing capture is in a branch that is subsequently
616        abandoned after a backtrack.
618    13. In the pathological case when an offset vector of size 2 is used, pcretest
619        now prints out the matched string after a yield of 0 or 1.
621    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
622        Only supported by the JIT compiler at the moment.
624    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
626    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
627        offset of the starting point of the matching process, provided the offsets
628        vector is large enough.
630    17. The \A escape now records a lookbehind value of 1, though its execution
631        does not actually inspect the previous character. This is to ensure that,
632        in partial multi-segment matching, at least one character from the old
633        segment is retained when a new segment is processed. Otherwise, if there
634        are no lookbehinds in the pattern, \A might match incorrectly at the start
635        of a new segment.
637    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
639    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
640        gives some modest performance improvement in 8-bit mode.
642    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
643        be expressed in certain programming languages using Universal Character
644        Names.
646    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
647        which points out that "non characters" are not "characters that may not
648        appear in Unicode strings" but rather "characters that are reserved for
649        internal use and have only local meaning".
651    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
652        there was a conditional group that depended on an assertion, if the
653        assertion was false, the callout that immediately followed the alternation
654        in the condition was skipped when pcre_exec() was used for matching.
656    23. Allow an explicit callout to be inserted before an assertion that is the
657        condition for a conditional group, for compatibility with automatic
658        callouts, which always insert a callout at this point.
660    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
661        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
663    25. (*PRUNE) is now supported by the JIT compiler.
665    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
667    27. Fix the case where there are two or more SKIPs with arguments that may be
668        ignored.
670    28. (*SKIP) is now supported by the JIT compiler.
672    29. (*THEN) is now supported by the JIT compiler.
674    30. Update RunTest with additional test selector options.
676    31. The way PCRE handles backtracking verbs has been changed in two ways.
678        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
679        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
680        backtracking. In some cases this makes it more Perl-compatible, but Perl's
681        rather obscure rules do not always do the same thing.
683        (2) Previously, backtracking verbs were confined within assertions. This is
684        no longer the case for positive assertions, except for (*ACCEPT). Again,
685        this sometimes improves Perl compatibility, and sometimes does not.
687    32. A number of tests that were in test 2 because Perl did things differently
688        have been moved to test 1, because either Perl or PCRE has changed, and
689        these tests are now compatible.
691    32. Backtracking control verbs are now handled in the same way in JIT and
692        interpreter.
694    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
695        contained a forward subroutine reference caused a compile error.
697    34. Auto-detect and optimize limited repetitions in JIT.
699    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
700        blocking (*UTF) etc.
702    36. In the interpreter, maximizing pattern repetitions for characters and
703        character types now use tail recursion, which reduces stack usage.
705    37. The value of the max lookbehind was not correctly preserved if a compiled
706        and saved regex was reloaded on a host of different endianness.
708    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
709        of the compiled pattern block, expand the flags field from 16 to 32 bits
710        because it was almost full.
712    39. Try madvise first before posix_madvise.
714    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
715        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
716        original change locked out all matches of empty strings. This has been
717        changed so that one match of an empty string per line is recognized.
718        Subsequent searches on the same line (for colouring or for --only-matching,
719        for example) do not recognize empty strings.
721    41. Applied a user patch to fix a number of spelling mistakes in comments.
723    42. Data lines longer than 65536 caused pcretest to crash.
725    43. Clarified the data type for length and startoffset arguments for pcre_exec
726        and pcre_dfa_exec in the function-specific man pages, where they were
727        explicitly stated to be in bytes, never having been updated. I also added
728        some clarification to the pcreapi man page.
730    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
731        a segmentation fault.
734    Version 8.32 30-November-2012
735    -----------------------------
737  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
738      character iterators.      character iterators.
# Line 16  Version 8.32 Line 746  Version 8.32
747  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
748      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
750  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
751      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
752      atomic brackets at the start of a pattern, or where there was a subsequent      atomic brackets at the start of a pattern, or where there was a subsequent
753      *PRUNE or *SKIP.      *PRUNE or *SKIP.
755  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
756      Patch by Daniel Richard G.      Patch by Daniel Richard G.
758  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
759      grep:      grep:
761      (a) There is now no limit to the number of patterns to be matched.      (a) There is now no limit to the number of patterns to be matched.
763      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
765      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
766          are now supported.          are now supported.
768      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
770      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
771          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
773      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
775      (g) In a Windows environment, the default for -d has been changed from      (g) In a Windows environment, the default for -d has been changed from
776          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
777          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
779      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
781  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
783  10. Changed the meaning of \X so that it now matches a Unicode extended  10. Changed the meaning of \X so that it now matches a Unicode extended
784      grapheme cluster.      grapheme cluster.
786  11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting  11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
787      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
789  12. Added support for PCRE_STUDY_EXTRA_NEEDED.  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
791  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
792      structure could go wrong in environments where size_t is not the same size      structure could go wrong in environments where size_t is not the same size
793      as int.      as int.
795  14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be  14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
796      set.      set.
798  15. The EBCDIC support had decayed; later updates to the code had included  15. The EBCDIC support had decayed; later updates to the code had included
799      explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a      explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
800      general tidy up of EBCDIC-related issues, and the documentation was also      general tidy up of EBCDIC-related issues, and the documentation was also
801      not quite right. There is now a test that can be run on ASCII systems to      not quite right. There is now a test that can be run on ASCII systems to
802      check some of the EBCDIC-related things (but is it not a full test).      check some of the EBCDIC-related things (but is it not a full test).
804    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
805        in a small tidy to the code.
807    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
809    18. If the --only-matching (-o) option in pcregrep is specified multiple
810        times, each one causes appropriate output. For example, -o1 -o2 outputs the
811        substrings matched by the 1st and 2nd capturing parentheses. A separating
812        string can be specified by --om-separator (default empty).
814    19. Improving the first n character searches.
816    20. Turn case lists for horizontal and vertical white space into macros so that
817        they are defined only once.
819    21. This set of changes together give more compatible Unicode case-folding
820        behaviour for characters that have more than one other case when UCP
821        support is available.
823        (a) The Unicode property table now has offsets into a new table of sets of
824            three or more characters that are case-equivalent. The MultiStage2.py
825            script that generates these tables (the pcre_ucd.c file) now scans
826            CaseFolding.txt instead of UnicodeData.txt for character case
827            information.
829        (b) The code for adding characters or ranges of characters to a character
830            class has been abstracted into a generalized function that also handles
831            case-independence. In UTF-mode with UCP support, this uses the new data
832            to handle characters with more than one other case.
834        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
835            whose other case is greater than 256 are now correctly matched
836            caselessly. Previously, the high codepoint matched the low one, but not
837            vice versa.
839        (d) The processing of \h, \H, \v, and \ in character classes now makes use
840            of the new class addition function, using character lists defined as
841            macros alongside the case definitions of 20 above.
843        (e) Caseless back references now work with characters that have more than
844            one other case.
846        (f) General caseless matching of characters with more than one other case
847            is supported.
849    22. Unicode character properties were updated from Unicode 6.2.0
851    23. Improved CMake support under Windows. Patch by Daniel Richard G.
853    24. Add support for 32-bit character strings, and UTF-32
855    25. Major JIT compiler update (code refactoring and bugfixing).
856        Experimental Sparc 32 support is added.
858    26. Applied a modified version of Daniel Richard G's patch to create
859        pcre.h.generic and config.h.generic by "make" instead of in the
860        PrepareRelease script.
862    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
863        pcre_compile.c when checking for a zero character.
865    28. Introducing a native interface for JIT. Through this interface, the compiled
866        machine code can be directly executed. The purpose of this interface is to
867        provide fast pattern matching, so several sanity checks are not performed.
868        However, feature tests are still performed. The new interface provides
869        1.4x speedup compared to the old one.
871    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
872        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
873        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
875    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
876        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
877        the "old" RFC 2279). Instead, it ended up passing a negative length to
878        pcre_exec().
880    31. Add support for GCC's visibility feature to hide internal functions.
882    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
883        "unknown -C option" after outputting 0 or 1.
885    33. There is now support for generating a code coverage report for the test
886        suite in environments where gcc is the compiler and lcov is installed. This
887        is mainly for the benefit of the developers.
889    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
890        unaddressable using valgrind annotations, allowing valgrind to detect
891        invalid memory accesses. This is mainly for the benefit of the developers.
893    25. (*UTF) can now be used to start a pattern in any of the three libraries.
895    26. Give configure error if --enable-cpp but no C++ compiler found.
898  Version 8.31 06-July-2012  Version 8.31 06-July-2012
# Line 1416  Version 7.9 11-Apr-09 Line 2238  Version 7.9 11-Apr-09
2238  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
2239      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
2240      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
2241      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
2242        8.33.]
2244  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
2245      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1659  Version 7.7 07-May-08 Line 2482  Version 7.7 07-May-08
2482      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2483      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2484      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2485      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2486      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2487      was subsequently set up correctly.)      was subsequently set up correctly.)

Removed from v.1033  
changed lines
  Added in v.1539

  ViewVC Help
Powered by ViewVC 1.1.5