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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 892 by ph10, Wed Jan 18 17:23:20 2012 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 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.
41    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
42        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
43        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
44        also returns the mark "x". This bug applied to capturing parentheses,
45        non-capturing parentheses, and atomic parentheses. It also applied to some
46        assertions.
48    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
49        information out of configure.ac instead of relying on pcre.h.generic, which
50        is not stored in the repository.
52    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
53        -lreadline.
55    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
57    15. Applied Graycode's patch to put the top-level frame on the stack rather
58        than the heap when not using the stack for recursion. This gives a
59        performance improvement in many cases when recursion is not deep.
62    Version 8.21 12-Dec-2011
63    ------------------------
65  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
67    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
68        are added as well.
70    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
71        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
72        calling _pcre_jit_exec. Some extra comments are added.
74    4.  (*MARK) settings inside atomic groups that do not contain any capturing
75        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
76        was introduced by change 18 for 8.20.
78    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
79        ECMA-262 standard.
81    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
82        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
83        This bug was probably introduced by change 9 of 8.13.
85    7.  While fixing 6 above, I noticed that a number of other items were being
86        incorrectly rejected as "not fixed length". This arose partly because newer
87        opcodes had not been added to the fixed-length checking code. I have (a)
88        corrected the bug and added tests for these items, and (b) arranged for an
89        error to occur if an unknown opcode is encountered while checking for fixed
90        length instead of just assuming "not fixed length". The items that were
91        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
92        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
93        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
95    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
96        being incorrectly compiled and would have given unpredicatble results.
98    9.  A possessively repeated subpattern with minimum repeat count greater than
99        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
100        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
101        the first (A) could occur when it should not.
103    10. Add a cast and remove a redundant test from the code.
105    11. JIT should use pcre_malloc/pcre_free for allocation.
107    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
108        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
109        is anything other than /usr, -L is still shown).
111    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
113    14. Perl does not support \N without a following name in a [] class; PCRE now
114        also gives an error.
116    15. If a forward reference was repeated with an upper limit of around 2000,
117        it caused the error "internal error: overran compiling workspace". The
118        maximum number of forward references (including repeats) was limited by the
119        internal workspace, and dependent on the LINK_SIZE. The code has been
120        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
121        the default depends on LINK_SIZE. There is a new upper limit (for safety)
122        of around 200,000 forward references. While doing this, I also speeded up
123        the filling in of repeated forward references.
125    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
126        incorrectly expecting the subject to contain another "a" after the start.
128    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
129        in the match, the SKIP should be ignored. This was not happening; instead
130        the SKIP was being treated as NOMATCH. For patterns such as
131        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
132        tested.
134    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
135        now much more compatible with Perl, in particular in cases where the result
136        is a non-match for a non-anchored pattern. For example, if
137        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
138        "m", where previously it did not return a name. A side effect of this
139        change is that for partial matches, the last encountered mark name is
140        returned, as for non matches. A number of tests that were previously not
141        Perl-compatible have been moved into the Perl-compatible test files. The
142        refactoring has had the pleasing side effect of removing one argument from
143        the match() function, thus reducing its stack requirements.
145    19. If the /S+ option was used in pcretest to study a pattern using JIT,
146        subsequent uses of /S (without +) incorrectly behaved like /S+.
148    21. Retrieve executable code size support for the JIT compiler and fixing
149        some warnings.
151    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
152        not work when the shorter character appeared right at the end of the
153        subject string.
155    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
156        systems.
158    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
159        output it when the /M option is used in pcretest.
161    25. The CheckMan script was not being included in the distribution. Also, added
162        an explicit "perl" to run Perl scripts from the PrepareRelease script
163        because this is reportedly needed in Windows.
165    26. If study data was being save in a file and studying had not found a set of
166        "starts with" bytes for the pattern, the data written to the file (though
167        never used) was taken from uninitialized memory and so caused valgrind to
168        complain.
170    27. Updated RunTest.bat as provided by Sheri Pierce.
172    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
174    29. Computation of memory usage for the table of capturing group names was
175        giving an unnecessarily large value.
178  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
179  ------------------------  ------------------------

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