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revision 729 by ph10, Mon Oct 10 16:02:20 2011 UTC revision 758 by ph10, Mon Nov 21 12:05:36 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 10-Oct-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    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
50        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
51        is anything other than /usr, -L is still shown).
52    
53    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
54    
55    14. Perl does not support \N without a following name in a [] class; PCRE now
56        also gives an error.
57    
58    
59    Version 8.20 21-Oct-2011
60  ------------------------  ------------------------
61    
62  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 65  Version 8.20 10-Oct-2011 Line 120  Version 8.20 10-Oct-2011
120      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
121      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
122      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
123    
124  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
125      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
126      after the value is now allowed for.      character after the value is now allowed for.
127    
128  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".
129      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
130    
131  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
132      subroutine, it did not work as intended. [But see next item.]      subroutine, it did not work as intended. [But see next item.]
133    
134  15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex  15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
135      pattern fragments (but not containing any | characters). If A and B are      pattern fragments (but not containing any | characters). If A and B are
136      matched, but there is a failure in C so that it backtracks to (*THEN), PCRE      matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
137      was behaving differently to Perl. PCRE backtracked into A, but Perl goes to      was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
138      D. In other words, Perl considers parentheses that do not contain any |      D. In other words, Perl considers parentheses that do not contain any |
139      characters to be part of a surrounding alternative, whereas PCRE was      characters to be part of a surrounding alternative, whereas PCRE was
140      treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles      treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
141      differently. PCRE now behaves in the same way as Perl, except in the case      differently. PCRE now behaves in the same way as Perl, except in the case
142      of subroutine/recursion calls such as (?1) which have in any case always      of subroutine/recursion calls such as (?1) which have in any case always
143      been different (but PCRE had them first :-).      been different (but PCRE had them first :-).
144    
145  16. Related to 15 above: Perl does not treat the | in a conditional group as  16. Related to 15 above: Perl does not treat the | in a conditional group as
146      creating alternatives. Such a group is treated in the same way as an      creating alternatives. Such a group is treated in the same way as an
147      ordinary group without any | characters when processing (*THEN). PCRE has      ordinary group without any | characters when processing (*THEN). PCRE has
148      been changed to match Perl's behaviour.      been changed to match Perl's behaviour.
149    
150  17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the  17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
151      RunGrepTest script failed.      RunGrepTest script failed.
152    
153  18. Change 22 for version 13 caused atomic groups to use more stack. This is  18. Change 22 for version 13 caused atomic groups to use more stack. This is
154      inevitable for groups that contain captures, but it can lead to a lot of      inevitable for groups that contain captures, but it can lead to a lot of
155      stack use in large patterns. The old behaviour has been restored for atomic      stack use in large patterns. The old behaviour has been restored for atomic
156      groups that do not contain any capturing parentheses.      groups that do not contain any capturing parentheses.
157    
158  19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not  19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
159      suppress the check for a minimum subject length at run time. (If it was      suppress the check for a minimum subject length at run time. (If it was
160      given to pcre_exec() or pcre_dfa_exec() it did work.)      given to pcre_exec() or pcre_dfa_exec() it did work.)
161    
162    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
163        fail to work when decoding hex characters in data strings in EBCDIC
164        environments.
165    
166    21. It appears that in at least one Mac OS environment, the isxdigit() function
167        is implemented as a macro that evaluates to its argument more than once,
168        contravening the C 90 Standard (I haven't checked a later standard). There
169        was an instance in pcretest which caused it to go wrong when processing
170        \x{...} escapes in subject strings. The has been rewritten to avoid using
171        things like p++ in the argument of isxdigit().
172    
173    
174  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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