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revision 793 by ph10, Wed Dec 7 16:52:34 2011 UTC revision 941 by zherczeg, Tue Feb 28 11:33:34 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. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
60    
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
62    
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
65    
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
67    
68    
69    Version 8.30 04-February-2012
70    -----------------------------
71    
72    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
73        name is defined in ctype.h.
74    
75    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
76        only in quite long subpatterns.
77    
78    3.  Removed the function pcre_info(), which has been obsolete and deprecated
79        since it was replaced by pcre_fullinfo() in February 2000.
80    
81    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
82        match a (*MARK), and the match failed at the start of the subject, a
83        reference to memory before the start of the subject could occur. This bug
84        was introduced by fix 17 of release 8.21.
85    
86    5.  A reference to an unset group with zero minimum repetition was giving
87        totally wrong answers (in non-JavaScript-compatibility mode). For example,
88        /(another)?(\1?)test/ matched against "hello world test". This bug was
89        introduced in release 8.13.
90    
91    6.  Add support for 16-bit character strings (a large amount of work involving
92        many changes and refactorings).
93    
94    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
95        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
96        from a file.
97    
98    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
99        rounding is not applied in this particular case).
100    
101    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
102        if they appear, or are escaped, in patterns.
103    
104    10. Get rid of a number of -Wunused-but-set-variable warnings.
105    
106    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
107        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
108        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
109        also returns the mark "x". This bug applied to capturing parentheses,
110        non-capturing parentheses, and atomic parentheses. It also applied to some
111        assertions.
112    
113    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
114        information out of configure.ac instead of relying on pcre.h.generic, which
115        is not stored in the repository.
116    
117    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
118        -lreadline.
119    
120    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
121    
122    15. Applied Graycode's patch to put the top-level frame on the stack rather
123        than the heap when not using the stack for recursion. This gives a
124        performance improvement in many cases when recursion is not deep.
125    
126    16. Experimental code added to "pcretest -C" to output the stack frame size.
127    
128    
129    Version 8.21 12-Dec-2011
130  ------------------------  ------------------------
131    
132  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 103  Version 8.21 05-Dec-2011 Line 228  Version 8.21 05-Dec-2011
228  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
229      an explicit "perl" to run Perl scripts from the PrepareRelease script      an explicit "perl" to run Perl scripts from the PrepareRelease script
230      because this is reportedly needed in Windows.      because this is reportedly needed in Windows.
231    
232  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
233      "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
234      never used) was taken from uninitialized memory and so caused valgrind to      never used) was taken from uninitialized memory and so caused valgrind to
235      complain.      complain.
236    
237  27. Updated RunTest.bat as provided by Sheri Pierce.  27. Updated RunTest.bat as provided by Sheri Pierce.
238    
239  28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.  28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
240    

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