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revision 702 by ph10, Tue Sep 20 15:45:06 2011 UTC revision 750 by ph10, Fri Nov 18 11:07:14 2011 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 12-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    
46    Version 8.20 21-Oct-2011
47  ------------------------  ------------------------
48    
49  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 9  Version 8.20 12-Sep-2011 Line 51  Version 8.20 12-Sep-2011
51      Perl has bugs and confusions, a closing square bracket is no longer allowed      Perl has bugs and confusions, a closing square bracket is no longer allowed
52      in a POSIX name. This bug also affected patterns with classes that started      in a POSIX name. This bug also affected patterns with classes that started
53      with full stops.      with full stops.
54    
55  2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no  2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
56      captured substring, but while checking the failing first alternative,      captured substring, but while checking the failing first alternative,
57      substring 1 is temporarily captured. If the output vector supplied to      substring 1 is temporarily captured. If the output vector supplied to
# Line 20  Version 8.20 12-Sep-2011 Line 62  Version 8.20 12-Sep-2011
62      such as /(a)(b)x|abc/ matched against "abc", where the return code      such as /(a)(b)x|abc/ matched against "abc", where the return code
63      indicates that fewer than the maximum number of slots in the ovector have      indicates that fewer than the maximum number of slots in the ovector have
64      been set.      been set.
65    
66  3.  Related to (2) above: when there are more back references in a pattern than  3.  Related to (2) above: when there are more back references in a pattern than
67      slots in the output vector, pcre_exec() uses temporary memory during      slots in the output vector, pcre_exec() uses temporary memory during
68      matching, and copies in the captures as far as possible afterwards. It was      matching, and copies in the captures as far as possible afterwards. It was
# Line 28  Version 8.20 12-Sep-2011 Line 70  Version 8.20 12-Sep-2011
70      that only 2/3 is used for passing back captured substrings. Now it uses      that only 2/3 is used for passing back captured substrings. Now it uses
71      only the first 2/3, for compatibility. This is, of course, another edge      only the first 2/3, for compatibility. This is, of course, another edge
72      case.      case.
73    
74  4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the  4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
75      main code base, and can be used by building with --enable-jit. When this is      main code base, and can be used by building with --enable-jit. When this is
76      done, pcregrep automatically uses it unless --disable-pcregrep-jit or the      done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
77      runtime --no-jit option is given.      runtime --no-jit option is given.
78    
79  5.  When the number of matches in a pcre_dfa_exec() run exactly filled the  5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
80      ovector, the return from the function was zero, implying that there were      ovector, the return from the function was zero, implying that there were
81      other matches that did not fit. The correct "exactly full" value is now      other matches that did not fit. The correct "exactly full" value is now
82      returned.      returned.
83    
84  6.  If a subpattern that was called recursively or as a subroutine contained  6.  If a subpattern that was called recursively or as a subroutine contained
85      (*PRUNE) or any other control that caused it to give a non-standard return,      (*PRUNE) or any other control that caused it to give a non-standard return,
86      invalid errors such as "Error -26 (nested recursion at the same subject      invalid errors such as "Error -26 (nested recursion at the same subject
87      position)" or even infinite loops could occur.      position)" or even infinite loops could occur.
88    
89  7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped  7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
90      computing the minimum length on reaching *ACCEPT, and so ended up with the      computing the minimum length on reaching *ACCEPT, and so ended up with the
91      wrong value of 1 rather than 0. Further investigation indicates that      wrong value of 1 rather than 0. Further investigation indicates that
92      computing a minimum subject length in the presence of *ACCEPT is difficult      computing a minimum subject length in the presence of *ACCEPT is difficult
93      (think back references, subroutine calls), and so I have changed the code      (think back references, subroutine calls), and so I have changed the code
94      so that no minimum is registered for a pattern that contains *ACCEPT.      so that no minimum is registered for a pattern that contains *ACCEPT.
95    
96  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,
97      it was not handled as intended.      it was not handled as intended. [But see 16 below.]
98    
99  9.  Replaced RunTest.bat with the much improved version provided by Sheri  9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
100      Pierce.      Sheri Pierce.
101    
102  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
103      the first byte in a match must be "a".      the first byte in a match must be "a".
104    
105  11. Change 17 for 8.13 increased the recursion depth for patterns like  11. Change 17 for 8.13 increased the recursion depth for patterns like
106      /a(?:.)*?a/ drastically. I've improved things by remembering whether a      /a(?:.)*?a/ drastically. I've improved things by remembering whether a
107      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
108      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
109      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
110    
111    12. In some environments, the output of pcretest -C is CRLF terminated. This
112        broke RunTest's code that checks for the link size. A single white space
113        character after the value is now allowed for.
114    
115    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
116        For "fr", it uses the Windows-specific input and output files.
117    
118    14. If (*THEN) appeared in a group that was called recursively or as a
119        subroutine, it did not work as intended. [But see next item.]
120    
121    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
122        pattern fragments (but not containing any | characters). If A and B are
123        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
124        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
125        D. In other words, Perl considers parentheses that do not contain any |
126        characters to be part of a surrounding alternative, whereas PCRE was
127        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
128        differently. PCRE now behaves in the same way as Perl, except in the case
129        of subroutine/recursion calls such as (?1) which have in any case always
130        been different (but PCRE had them first :-).
131    
132    16. Related to 15 above: Perl does not treat the | in a conditional group as
133        creating alternatives. Such a group is treated in the same way as an
134        ordinary group without any | characters when processing (*THEN). PCRE has
135        been changed to match Perl's behaviour.
136    
137    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
138        RunGrepTest script failed.
139    
140    18. Change 22 for version 13 caused atomic groups to use more stack. This is
141        inevitable for groups that contain captures, but it can lead to a lot of
142        stack use in large patterns. The old behaviour has been restored for atomic
143        groups that do not contain any capturing parentheses.
144    
145    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
146        suppress the check for a minimum subject length at run time. (If it was
147        given to pcre_exec() or pcre_dfa_exec() it did work.)
148    
149    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
150        fail to work when decoding hex characters in data strings in EBCDIC
151        environments.
152    
153    21. It appears that in at least one Mac OS environment, the isxdigit() function
154        is implemented as a macro that evaluates to its argument more than once,
155        contravening the C 90 Standard (I haven't checked a later standard). There
156        was an instance in pcretest which caused it to go wrong when processing
157        \x{...} escapes in subject strings. The has been rewritten to avoid using
158        things like p++ in the argument of isxdigit().
159    
160    
161  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011
162  ------------------------  ------------------------

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