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revision 713 by ph10, Tue Sep 27 11:03:15 2011 UTC revision 747 by ph10, Tue Nov 15 17:35:10 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    
38    Version 8.20 21-Oct-2011
39  ------------------------  ------------------------
40    
41  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 86  Version 8.20 23-Sep-2011
86      so that no minimum is registered for a pattern that contains *ACCEPT.      so that no minimum is registered for a pattern that contains *ACCEPT.
87    
88  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,
89      it was not handled as intended.      it was not handled as intended. [But see 16 below.]
90    
91  9.  Replaced RunTest.bat with the much improved version provided by Sheri  9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
92      Pierce.      Sheri Pierce.
93    
94  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
95      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 99  Version 8.20 23-Sep-2011
99      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
100      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
101      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
102    
103  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
104      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
105      after the value is now allowed for.      character after the value is now allowed for.
106    
107  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".
108      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
109    
110  14. If (*THEN) appeared in a group that was called recursively or as a  14. If (*THEN) appeared in a group that was called recursively or as a
111      subroutine, it did not work as intended.      subroutine, it did not work as intended. [But see next item.]
112    
113    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
114        pattern fragments (but not containing any | characters). If A and B are
115        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
116        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
117        D. In other words, Perl considers parentheses that do not contain any |
118        characters to be part of a surrounding alternative, whereas PCRE was
119        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
120        differently. PCRE now behaves in the same way as Perl, except in the case
121        of subroutine/recursion calls such as (?1) which have in any case always
122        been different (but PCRE had them first :-).
123    
124    16. Related to 15 above: Perl does not treat the | in a conditional group as
125        creating alternatives. Such a group is treated in the same way as an
126        ordinary group without any | characters when processing (*THEN). PCRE has
127        been changed to match Perl's behaviour.
128    
129    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
130        RunGrepTest script failed.
131    
132    18. Change 22 for version 13 caused atomic groups to use more stack. This is
133        inevitable for groups that contain captures, but it can lead to a lot of
134        stack use in large patterns. The old behaviour has been restored for atomic
135        groups that do not contain any capturing parentheses.
136    
137    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
138        suppress the check for a minimum subject length at run time. (If it was
139        given to pcre_exec() or pcre_dfa_exec() it did work.)
140    
141    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
142        fail to work when decoding hex characters in data strings in EBCDIC
143        environments.
144    
145    21. It appears that in at least one Mac OS environment, the isxdigit() function
146        is implemented as a macro that evaluates to its argument more than once,
147        contravening the C 90 Standard (I haven't checked a later standard). There
148        was an instance in pcretest which caused it to go wrong when processing
149        \x{...} escapes in subject strings. The has been rewritten to avoid using
150        things like p++ in the argument of isxdigit().
151    
152    
153  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011
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