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revision 738 by ph10, Fri Oct 21 09:04:01 2011 UTC revision 881 by ph10, Sun Jan 15 18:07:05 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4    Version 8.30
5    ------------
7    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
8        name is defined in ctype.h.
10    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
11        only in quite long subpatterns.
13    3.  Removed the function pcre_info(), which has been obsolete and deprecated
14        since it was replaced by pcre_fullinfo() in February 2000.
16    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
17        match a (*MARK), and the match failed at the start of the subject, a
18        reference to memory before the start of the subject could occur. This bug
19        was introduced by fix 17 of release 8.21.
21    5.  A reference to an unset group with zero minimum repetition was giving
22        totally wrong answers (in non-JavaScript-compatibility mode). For example,
23        /(another)?(\1?)test/ matched against "hello world test". This bug was
24        introduced in release 8.13.
26    6.  Add support for 16-bit character strings (a large amount of work involving
27        many changes and refactorings).
29    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
30        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
31        from a file.
33    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
34        rounding is not applied in this particular case).
36    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
37        if they appear, or are escaped, in patterns.
39    10. Get rid of a number of -Wunused-but-set-variable warnings.
42    Version 8.21 12-Dec-2011
43    ------------------------
45    1.  Updating the JIT compiler.
47    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
48        are added as well.
50    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
51        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
52        calling _pcre_jit_exec. Some extra comments are added.
54    4.  (*MARK) settings inside atomic groups that do not contain any capturing
55        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
56        was introduced by change 18 for 8.20.
58    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
59        ECMA-262 standard.
61    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
62        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
63        This bug was probably introduced by change 9 of 8.13.
65    7.  While fixing 6 above, I noticed that a number of other items were being
66        incorrectly rejected as "not fixed length". This arose partly because newer
67        opcodes had not been added to the fixed-length checking code. I have (a)
68        corrected the bug and added tests for these items, and (b) arranged for an
69        error to occur if an unknown opcode is encountered while checking for fixed
70        length instead of just assuming "not fixed length". The items that were
71        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
72        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
73        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
75    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
76        being incorrectly compiled and would have given unpredicatble results.
78    9.  A possessively repeated subpattern with minimum repeat count greater than
79        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
80        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
81        the first (A) could occur when it should not.
83    10. Add a cast and remove a redundant test from the code.
85    11. JIT should use pcre_malloc/pcre_free for allocation.
87    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
88        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
89        is anything other than /usr, -L is still shown).
91    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
93    14. Perl does not support \N without a following name in a [] class; PCRE now
94        also gives an error.
96    15. If a forward reference was repeated with an upper limit of around 2000,
97        it caused the error "internal error: overran compiling workspace". The
98        maximum number of forward references (including repeats) was limited by the
99        internal workspace, and dependent on the LINK_SIZE. The code has been
100        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
101        the default depends on LINK_SIZE. There is a new upper limit (for safety)
102        of around 200,000 forward references. While doing this, I also speeded up
103        the filling in of repeated forward references.
105    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
106        incorrectly expecting the subject to contain another "a" after the start.
108    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
109        in the match, the SKIP should be ignored. This was not happening; instead
110        the SKIP was being treated as NOMATCH. For patterns such as
111        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
112        tested.
114    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
115        now much more compatible with Perl, in particular in cases where the result
116        is a non-match for a non-anchored pattern. For example, if
117        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
118        "m", where previously it did not return a name. A side effect of this
119        change is that for partial matches, the last encountered mark name is
120        returned, as for non matches. A number of tests that were previously not
121        Perl-compatible have been moved into the Perl-compatible test files. The
122        refactoring has had the pleasing side effect of removing one argument from
123        the match() function, thus reducing its stack requirements.
125    19. If the /S+ option was used in pcretest to study a pattern using JIT,
126        subsequent uses of /S (without +) incorrectly behaved like /S+.
128    21. Retrieve executable code size support for the JIT compiler and fixing
129        some warnings.
131    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
132        not work when the shorter character appeared right at the end of the
133        subject string.
135    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
136        systems.
138    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
139        output it when the /M option is used in pcretest.
141    25. The CheckMan script was not being included in the distribution. Also, added
142        an explicit "perl" to run Perl scripts from the PrepareRelease script
143        because this is reportedly needed in Windows.
145    26. If study data was being save in a file and studying had not found a set of
146        "starts with" bytes for the pattern, the data written to the file (though
147        never used) was taken from uninitialized memory and so caused valgrind to
148        complain.
150    27. Updated RunTest.bat as provided by Sheri Pierce.
152    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
154    29. Computation of memory usage for the table of capturing group names was
155        giving an unnecessarily large value.
158  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
159  ------------------------  ------------------------

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