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revision 787 by ph10, Tue Dec 6 15:37:24 2011 UTC revision 936 by ph10, Sat Feb 25 17:02:23 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21 05-Dec-2011  Version 8.31
5    -----------------------------
6    
7    1.  Fixing a wrong JIT test case and some compiler warnings.
8    
9    2.  Removed a bashism from the RunTest script.
10    
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
14    
15    4.  Partial matching support is added to the JIT compiler.
16    
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
19    
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
23    
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
26    
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
29    
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
32    
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
35    
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
39    
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
42    
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
44    
45    9.  (*MARK) control verb is now supported by the JIT compiler.
46    
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
49    
50    11. Add PCRE_INFO_MAXLOOKBEHIND.
51    
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
57    
58    13. (*COMMIT) is now correctly confined to within a recursive subpattern call.
59    
60    14. It is now possible to link pcretest with libedit as an alternative to
61        libreadline.
62    
63    
64    Version 8.30 04-February-2012
65    -----------------------------
66    
67    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
68        name is defined in ctype.h.
69    
70    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
71        only in quite long subpatterns.
72    
73    3.  Removed the function pcre_info(), which has been obsolete and deprecated
74        since it was replaced by pcre_fullinfo() in February 2000.
75    
76    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
77        match a (*MARK), and the match failed at the start of the subject, a
78        reference to memory before the start of the subject could occur. This bug
79        was introduced by fix 17 of release 8.21.
80    
81    5.  A reference to an unset group with zero minimum repetition was giving
82        totally wrong answers (in non-JavaScript-compatibility mode). For example,
83        /(another)?(\1?)test/ matched against "hello world test". This bug was
84        introduced in release 8.13.
85    
86    6.  Add support for 16-bit character strings (a large amount of work involving
87        many changes and refactorings).
88    
89    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
90        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
91        from a file.
92    
93    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
94        rounding is not applied in this particular case).
95    
96    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
97        if they appear, or are escaped, in patterns.
98    
99    10. Get rid of a number of -Wunused-but-set-variable warnings.
100    
101    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
102        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
103        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
104        also returns the mark "x". This bug applied to capturing parentheses,
105        non-capturing parentheses, and atomic parentheses. It also applied to some
106        assertions.
107    
108    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
109        information out of configure.ac instead of relying on pcre.h.generic, which
110        is not stored in the repository.
111    
112    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
113        -lreadline.
114    
115    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
116    
117    15. Applied Graycode's patch to put the top-level frame on the stack rather
118        than the heap when not using the stack for recursion. This gives a
119        performance improvement in many cases when recursion is not deep.
120    
121    16. Experimental code added to "pcretest -C" to output the stack frame size.
122    
123    
124    Version 8.21 12-Dec-2011
125  ------------------------  ------------------------
126    
127  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 103  Version 8.21 05-Dec-2011 Line 223  Version 8.21 05-Dec-2011
223  25. The CheckMan script was not being included in the distribution. Also, added  25. The CheckMan script was not being included in the distribution. Also, added
224      an explicit "perl" to run Perl scripts from the PrepareRelease script      an explicit "perl" to run Perl scripts from the PrepareRelease script
225      because this is reportedly needed in Windows.      because this is reportedly needed in Windows.
226    
227  26. If study data was being save in a file and studying had not found a set of  26. If study data was being save in a file and studying had not found a set of
228      "starts with" bytes for the pattern, the data written to the file (though      "starts with" bytes for the pattern, the data written to the file (though
229      never used) was taken from uninitialized memory and so caused valgrind to      never used) was taken from uninitialized memory and so caused valgrind to
230      complain.      complain.
231    
232    27. Updated RunTest.bat as provided by Sheri Pierce.
233    
234    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
235    
236    29. Computation of memory usage for the table of capturing group names was
237        giving an unnecessarily large value.
238    
239    
240  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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