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revision 916 by ph10, Wed Feb 15 09:50:53 2012 UTC revision 989 by zherczeg, Sat Jul 7 11:11:02 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.31  Version 8.32
5  -----------------------------  ------------
6    
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
9    
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
12    
13    3.  Single character iterator optimizations in the JIT compiler.
14    
15    
16    Version 8.31 06-July-2012
17    -------------------------
18    
19  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
20    
21  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
22    
23  3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied  3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
24      to unsigned type, result still unsigned" that was given by an MS compiler      to unsigned type, result still unsigned" that was given by an MS compiler
25      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
26    
27  4.  Partial matching support is added to the JIT compiler.  4.  Partial matching support is added to the JIT compiler.
28    
29  5.  Fixed several bugs concerned with partial matching of items that consist  5.  Fixed several bugs concerned with partial matching of items that consist
30      of more than one character:      of more than one character:
31    
32      (a) /^(..)\1/ did not partially match "aba" because checking references was      (a) /^(..)\1/ did not partially match "aba" because checking references was
33          done on an "all or nothing" basis. This also applied to repeated          done on an "all or nothing" basis. This also applied to repeated
34          references.          references.
35    
36      (b) \R did not give a hard partial match if \r was found at the end of the      (b) \R did not give a hard partial match if \r was found at the end of the
37          subject.          subject.
38    
39      (c) \X did not give a hard partial match after matching one or more      (c) \X did not give a hard partial match after matching one or more
40          characters at the end of the subject.          characters at the end of the subject.
41    
42      (d) When newline was set to CRLF, a pattern such as /a$/ did not give a      (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
43          partial match for the string "\r".          a partial match for the string "\r".
44    
45        (e) When newline was set to CRLF, the metacharacter "." did not recognize
46            a partial match for a CR character at the end of the subject string.
47    
48    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
49        running pcretest, the text "(JIT)" added to the output whenever JIT is
50        actually used to run the match.
51    
52    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
53        or /S+[+] with a digit between 1 and 7.
54    
55    8.  OP_NOT now supports any UTF character not just single-byte ones.
56    
57    9.  (*MARK) control verb is now supported by the JIT compiler.
58    
59    10. The command "./RunTest list" lists the available tests without actually
60        running any of them. (Because I keep forgetting what they all are.)
61    
62    11. Add PCRE_INFO_MAXLOOKBEHIND.
63    
64    12. Applied a (slightly modified) user-supplied patch that improves performance
65        when the heap is used for recursion (compiled with --disable-stack-for-
66        recursion). Instead of malloc and free for each heap frame each time a
67        logical recursion happens, frames are retained on a chain and re-used where
68        possible. This sometimes gives as much as 30% improvement.
69    
70    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
71        call.
72    
73    14. As documented, (*COMMIT) is now confined to within a positive assertion.
74    
75    15. It is now possible to link pcretest with libedit as an alternative to
76        libreadline.
77    
78    16. (*COMMIT) control verb is now supported by the JIT compiler.
79    
80    17. The Unicode data tables have been updated to Unicode 6.1.0.
81    
82    18. Added --file-list option to pcregrep.
83    
84    19. Added binary file support to pcregrep, including the -a, --binary-files,
85        -I, and --text options.
86    
87    20. The madvise function is renamed for posix_madvise for QNX compatibility
88        reasons. Fixed by Giuseppe D'Angelo.
89    
90    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
91    
92    22. Changed the option for creating symbolic links for 16-bit man pages from
93        -s to -sf so that re-installing does not cause issues.
94    
95    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
96    
97    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
98        matches in certain environments (the workspace was not being correctly
99        retained). Also added to pcre_dfa_exec() a simple plausibility check on
100        some of the workspace data at the beginning of a restart.
101    
102    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
103        was not doing so when it should - probably a typo introduced by SVN 528
104        (change 8.10/14).
105    
106    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
107        \w+ when the character tables indicated that \x{c4} was a word character.
108        There were several related cases, all because the tests for doing a table
109        lookup were testing for characters less than 127 instead of 255.
110    
111    27. If a pattern contains capturing parentheses that are not used in a match,
112        their slots in the ovector are set to -1. For those that are higher than
113        any matched groups, this happens at the end of processing. In the case when
114        there were back references that the ovector was too small to contain
115        (causing temporary malloc'd memory to be used during matching), and the
116        highest capturing number was not used, memory off the end of the ovector
117        was incorrectly being set to -1. (It was using the size of the temporary
118        memory instead of the true size.)
119    
120    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
121        ovector size, it uses memory at the end of the block that it has got.
122    
123    29. Check for an overlong MARK name and give an error at compile time. The
124        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
125    
126    30. JIT compiler update.
127    
128    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
129        Rill for the patch.
130    
131    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
132    
133    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
134    
135    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
136        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
137        was enabled.
138    
139    35. Improve JIT code generation for greedy plus quantifier.
140    
141    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
142        1 to "aa" instead of to an empty string. The bug affected repeated groups
143        that could potentially match an empty string.
144    
145    37. Optimizing single character iterators in JIT.
146    
147    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
148        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
149        codepoints that are too big for the mode are faulted, and in a UTF mode,
150        disallowed codepoints are also faulted.
151    
152    39. If PCRE was compiled with UTF support, in three places in the DFA
153        matcher there was code that should only have been obeyed in UTF mode, but
154        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
155        processing when bytes with values greater than 127 were present. In 16-bit
156        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
157        both cases the values are those that cannot be the first data item in a UTF
158        character. The three items that might have provoked this were recursions,
159        possessively repeated groups, and atomic groups.
160    
161    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
162        and pcregrep, because some OS require shared objects to be explicitly
163        passed to ld, causing the link step to fail if they are not.
164    
165    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
166        mode, patterns that started with \h* or \R* might be incorrectly matched.
167    
168    
169  Version 8.30 04-February-2012  Version 8.30 04-February-2012

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