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revision 712 by ph10, Mon Sep 26 16:31:42 2011 UTC revision 752 by zherczeg, Sat Nov 19 15:28:29 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 23-Sep-2011  Version 8.21
5    ------------
6    
7    1.  Updating the JIT compiler.
8    
9    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
10        are added as well.
11    
12    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
13        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
14        calling _pcre_jit_exec. Some extra comments are added.
15    
16    4.  Mark settings inside atomic groups that do not contain any capturing
17        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
18        was introduced by change 18 for 8.20.
19    
20    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
21        ECMA-262 standard.
22    
23    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
24        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
25        This bug was probably introduced by change 9 of 8.13.
26    
27    7.  While fixing 6 above, I noticed that a number of other items were being
28        incorrectly rejected as "not fixed length". This arose partly because newer
29        opcodes had not been added to the fixed-length checking code. I have (a)
30        corrected the bug and added tests for these items, and (b) arranged for an
31        error to occur if an unknown opcode is encountered while checking for fixed
32        length instead of just assuming "not fixed length". The items that were
33        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
34        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
35        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
36    
37    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
38        being incorrectly compiled and would have given unpredicatble results.
39    
40    9.  A possessively repeated subpattern with minimum repeat count greater than
41        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
42        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
43        the first (A) could occur when it should not.
44    
45    10. Add a cast and remove a redundant test from the code.
46    
47    11. JIT should use pcre_malloc/pcre_free for allocation.
48    
49    
50    Version 8.20 21-Oct-2011
51  ------------------------  ------------------------
52    
53  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
# Line 52  Version 8.20 23-Sep-2011 Line 98  Version 8.20 23-Sep-2011
98      so that no minimum is registered for a pattern that contains *ACCEPT.      so that no minimum is registered for a pattern that contains *ACCEPT.
99    
100  8.  If (*THEN) was present in the first (true) branch of a conditional group,  8.  If (*THEN) was present in the first (true) branch of a conditional group,
101      it was not handled as intended.      it was not handled as intended. [But see 16 below.]
102    
103  9.  Replaced RunTest.bat with the much improved version provided by Sheri  9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
104      Pierce.      Sheri Pierce.
105    
106  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
107      the first byte in a match must be "a".      the first byte in a match must be "a".
# Line 65  Version 8.20 23-Sep-2011 Line 111  Version 8.20 23-Sep-2011
111      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
112      optimizations are restored. It would be nice to do this on a per-group      optimizations are restored. It would be nice to do this on a per-group
113      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
114    
115  12. In some environments, the output of pcretest -C is CRLF terminated. This  12. In some environments, the output of pcretest -C is CRLF terminated. This
116      broke RunTest's code that checks for the link size. A single white space      broke RunTest's code that checks for the link size. A single white space
117      after the value is now allowed for.      character after the value is now allowed for.
118    
119  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
120      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
121    
122    14. If (*THEN) appeared in a group that was called recursively or as a
123        subroutine, it did not work as intended. [But see next item.]
124    
125    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
126        pattern fragments (but not containing any | characters). If A and B are
127        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
128        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
129        D. In other words, Perl considers parentheses that do not contain any |
130        characters to be part of a surrounding alternative, whereas PCRE was
131        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
132        differently. PCRE now behaves in the same way as Perl, except in the case
133        of subroutine/recursion calls such as (?1) which have in any case always
134        been different (but PCRE had them first :-).
135    
136    16. Related to 15 above: Perl does not treat the | in a conditional group as
137        creating alternatives. Such a group is treated in the same way as an
138        ordinary group without any | characters when processing (*THEN). PCRE has
139        been changed to match Perl's behaviour.
140    
141    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
142        RunGrepTest script failed.
143    
144    18. Change 22 for version 13 caused atomic groups to use more stack. This is
145        inevitable for groups that contain captures, but it can lead to a lot of
146        stack use in large patterns. The old behaviour has been restored for atomic
147        groups that do not contain any capturing parentheses.
148    
149    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
150        suppress the check for a minimum subject length at run time. (If it was
151        given to pcre_exec() or pcre_dfa_exec() it did work.)
152    
153    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
154        fail to work when decoding hex characters in data strings in EBCDIC
155        environments.
156    
157    21. It appears that in at least one Mac OS environment, the isxdigit() function
158        is implemented as a macro that evaluates to its argument more than once,
159        contravening the C 90 Standard (I haven't checked a later standard). There
160        was an instance in pcretest which caused it to go wrong when processing
161        \x{...} escapes in subject strings. The has been rewritten to avoid using
162        things like p++ in the argument of isxdigit().
163    
164    
165  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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