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revision 743 by ph10, Tue Nov 8 09:59:38 2011 UTC revision 873 by ph10, Sat Jan 14 16:45:24 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.30
5  ------------  ------------
6    
7    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
8        name is defined in ctype.h.
9    
10    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
11        only in quite long subpatterns.
12    
13    3.  Removed the function pcre_info(), which has been obsolete and deprecated
14        since it was replaced by pcre_fullinfo() in February 2000.
15    
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.
20    
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.
25    
26    6.  Add support for 16-bit character strings (a large amount of work involving
27        many changes and refactorings).
28    
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.
32    
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).
35    
36    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
37        if they appear, or are escaped, in patterns.
38    
39    
40    Version 8.21 12-Dec-2011
41    ------------------------
42    
43  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
44    
45  2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases  2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
# Line 12  Version 8.21 Line 48  Version 8.21
48  3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).  3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
49      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
50      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
51    
52  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
53      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
54      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
55    
56    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
57        ECMA-262 standard.
58    
59    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
60        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
61        This bug was probably introduced by change 9 of 8.13.
62    
63    7.  While fixing 6 above, I noticed that a number of other items were being
64        incorrectly rejected as "not fixed length". This arose partly because newer
65        opcodes had not been added to the fixed-length checking code. I have (a)
66        corrected the bug and added tests for these items, and (b) arranged for an
67        error to occur if an unknown opcode is encountered while checking for fixed
68        length instead of just assuming "not fixed length". The items that were
69        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
70        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
71        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
72    
73    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
74        being incorrectly compiled and would have given unpredicatble results.
75    
76    9.  A possessively repeated subpattern with minimum repeat count greater than
77        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
78        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
79        the first (A) could occur when it should not.
80    
81    10. Add a cast and remove a redundant test from the code.
82    
83    11. JIT should use pcre_malloc/pcre_free for allocation.
84    
85    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
86        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
87        is anything other than /usr, -L is still shown).
88    
89    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
90    
91    14. Perl does not support \N without a following name in a [] class; PCRE now
92        also gives an error.
93    
94    15. If a forward reference was repeated with an upper limit of around 2000,
95        it caused the error "internal error: overran compiling workspace". The
96        maximum number of forward references (including repeats) was limited by the
97        internal workspace, and dependent on the LINK_SIZE. The code has been
98        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
99        the default depends on LINK_SIZE. There is a new upper limit (for safety)
100        of around 200,000 forward references. While doing this, I also speeded up
101        the filling in of repeated forward references.
102    
103    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
104        incorrectly expecting the subject to contain another "a" after the start.
105    
106    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
107        in the match, the SKIP should be ignored. This was not happening; instead
108        the SKIP was being treated as NOMATCH. For patterns such as
109        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
110        tested.
111    
112    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
113        now much more compatible with Perl, in particular in cases where the result
114        is a non-match for a non-anchored pattern. For example, if
115        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
116        "m", where previously it did not return a name. A side effect of this
117        change is that for partial matches, the last encountered mark name is
118        returned, as for non matches. A number of tests that were previously not
119        Perl-compatible have been moved into the Perl-compatible test files. The
120        refactoring has had the pleasing side effect of removing one argument from
121        the match() function, thus reducing its stack requirements.
122    
123    19. If the /S+ option was used in pcretest to study a pattern using JIT,
124        subsequent uses of /S (without +) incorrectly behaved like /S+.
125    
126    21. Retrieve executable code size support for the JIT compiler and fixing
127        some warnings.
128    
129    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
130        not work when the shorter character appeared right at the end of the
131        subject string.
132    
133    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
134        systems.
135    
136    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
137        output it when the /M option is used in pcretest.
138    
139    25. The CheckMan script was not being included in the distribution. Also, added
140        an explicit "perl" to run Perl scripts from the PrepareRelease script
141        because this is reportedly needed in Windows.
142    
143    26. If study data was being save in a file and studying had not found a set of
144        "starts with" bytes for the pattern, the data written to the file (though
145        never used) was taken from uninitialized memory and so caused valgrind to
146        complain.
147    
148    27. Updated RunTest.bat as provided by Sheri Pierce.
149    
150    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
151    
152    29. Computation of memory usage for the table of capturing group names was
153        giving an unnecessarily large value.
154    
155    
156  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
157  ------------------------  ------------------------

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