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revision 729 by ph10, Mon Oct 10 16:02:20 2011 UTC revision 754 by ph10, Sat Nov 19 18:32:18 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    
56    Version 8.20 21-Oct-2011
57  ------------------------  ------------------------
58    
59  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 117  Version 8.20 10-Oct-2011
117      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
118      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
119      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
120    
121  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
122      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
123      after the value is now allowed for.      character after the value is now allowed for.
124    
125  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".
126      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
127    
128  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
129      subroutine, it did not work as intended. [But see next item.]      subroutine, it did not work as intended. [But see next item.]
130    
131  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
132      pattern fragments (but not containing any | characters). If A and B are      pattern fragments (but not containing any | characters). If A and B are
133      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
134      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
135      D. In other words, Perl considers parentheses that do not contain any |      D. In other words, Perl considers parentheses that do not contain any |
136      characters to be part of a surrounding alternative, whereas PCRE was      characters to be part of a surrounding alternative, whereas PCRE was
137      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
138      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
139      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
140      been different (but PCRE had them first :-).      been different (but PCRE had them first :-).
141    
142  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
143      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
144      ordinary group without any | characters when processing (*THEN). PCRE has      ordinary group without any | characters when processing (*THEN). PCRE has
145      been changed to match Perl's behaviour.      been changed to match Perl's behaviour.
146    
147  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
148      RunGrepTest script failed.      RunGrepTest script failed.
149    
150  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
151      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
152      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
153      groups that do not contain any capturing parentheses.      groups that do not contain any capturing parentheses.
154    
155  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
156      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
157      given to pcre_exec() or pcre_dfa_exec() it did work.)      given to pcre_exec() or pcre_dfa_exec() it did work.)
158    
159    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
160        fail to work when decoding hex characters in data strings in EBCDIC
161        environments.
162    
163    21. It appears that in at least one Mac OS environment, the isxdigit() function
164        is implemented as a macro that evaluates to its argument more than once,
165        contravening the C 90 Standard (I haven't checked a later standard). There
166        was an instance in pcretest which caused it to go wrong when processing
167        \x{...} escapes in subject strings. The has been rewritten to avoid using
168        things like p++ in the argument of isxdigit().
169    
170    
171  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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