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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 836 by ph10, Wed Dec 28 17:16:11 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  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 the code for calculating the fixed length of lookbehind
11        assertions.
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).
30    Version 8.21 12-Dec-2011
31    ------------------------
33  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
35    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
36        are added as well.
38    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
39        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
40        calling _pcre_jit_exec. Some extra comments are added.
42    4.  (*MARK) settings inside atomic groups that do not contain any capturing
43        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
44        was introduced by change 18 for 8.20.
46    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
47        ECMA-262 standard.
49    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
50        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
51        This bug was probably introduced by change 9 of 8.13.
53    7.  While fixing 6 above, I noticed that a number of other items were being
54        incorrectly rejected as "not fixed length". This arose partly because newer
55        opcodes had not been added to the fixed-length checking code. I have (a)
56        corrected the bug and added tests for these items, and (b) arranged for an
57        error to occur if an unknown opcode is encountered while checking for fixed
58        length instead of just assuming "not fixed length". The items that were
59        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
60        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
61        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
63    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
64        being incorrectly compiled and would have given unpredicatble results.
66    9.  A possessively repeated subpattern with minimum repeat count greater than
67        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
68        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
69        the first (A) could occur when it should not.
71    10. Add a cast and remove a redundant test from the code.
73    11. JIT should use pcre_malloc/pcre_free for allocation.
75    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
76        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
77        is anything other than /usr, -L is still shown).
79    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
81    14. Perl does not support \N without a following name in a [] class; PCRE now
82        also gives an error.
84    15. If a forward reference was repeated with an upper limit of around 2000,
85        it caused the error "internal error: overran compiling workspace". The
86        maximum number of forward references (including repeats) was limited by the
87        internal workspace, and dependent on the LINK_SIZE. The code has been
88        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
89        the default depends on LINK_SIZE. There is a new upper limit (for safety)
90        of around 200,000 forward references. While doing this, I also speeded up
91        the filling in of repeated forward references.
93    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
94        incorrectly expecting the subject to contain another "a" after the start.
96    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
97        in the match, the SKIP should be ignored. This was not happening; instead
98        the SKIP was being treated as NOMATCH. For patterns such as
99        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
100        tested.
102    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
103        now much more compatible with Perl, in particular in cases where the result
104        is a non-match for a non-anchored pattern. For example, if
105        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
106        "m", where previously it did not return a name. A side effect of this
107        change is that for partial matches, the last encountered mark name is
108        returned, as for non matches. A number of tests that were previously not
109        Perl-compatible have been moved into the Perl-compatible test files. The
110        refactoring has had the pleasing side effect of removing one argument from
111        the match() function, thus reducing its stack requirements.
113    19. If the /S+ option was used in pcretest to study a pattern using JIT,
114        subsequent uses of /S (without +) incorrectly behaved like /S+.
116    21. Retrieve executable code size support for the JIT compiler and fixing
117        some warnings.
119    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
120        not work when the shorter character appeared right at the end of the
121        subject string.
123    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
124        systems.
126    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
127        output it when the /M option is used in pcretest.
129    25. The CheckMan script was not being included in the distribution. Also, added
130        an explicit "perl" to run Perl scripts from the PrepareRelease script
131        because this is reportedly needed in Windows.
133    26. If study data was being save in a file and studying had not found a set of
134        "starts with" bytes for the pattern, the data written to the file (though
135        never used) was taken from uninitialized memory and so caused valgrind to
136        complain.
138    27. Updated RunTest.bat as provided by Sheri Pierce.
140    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
142    29. Computation of memory usage for the table of capturing group names was
143        giving an unnecessarily large value.
146  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
147  ------------------------  ------------------------

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