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revision 942 by ph10, Tue Feb 28 14:50:31 2012 UTC revision 1009 by zherczeg, Wed Aug 22 12:01:22 2012 UTC
# Line 1  Line 1 
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    4.  Improved JIT compiler optimizations for character ranges.
16    
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
19    
20    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
21        of a line, was being set incorrectly in cases where .* appeared inside
22        atomic brackets at the start of a pattern, or where there was a subsequent
23        *PRUNE or *SKIP.
24    
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
27    
28    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        grep:
30    
31        (a) There is now no limit to the number of patterns to be matched.
32    
33        (b) An error is given if a pattern is too long.
34    
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
37    
38        (d) --exclude-from and --include-from (multiple use) have been added.
39    
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
42    
43        (f) Multiple uses of -f and --file-list are now supported.
44    
45        (g) In a Windows environment, the default for -d has been changed from
46            "read" (the GNU grep default) to "skip", because otherwise the presence
47            of a directory in the file list provokes an error.
48    
49        (h) The documentation has been revised and clarified in places.
50    
51    9.  Improve the matching speed of capturing brackets.
52    
53    
54    Version 8.31 06-July-2012
55    -------------------------
56    
57  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
58    
59  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
60    
61  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
62      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
63      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
64    
65  4.  Partial matching support is added to the JIT compiler.  4.  Partial matching support is added to the JIT compiler.
# Line 18  Version 8.31 Line 68  Version 8.31
68      of more than one character:      of more than one character:
69    
70      (a) /^(..)\1/ did not partially match "aba" because checking references was      (a) /^(..)\1/ did not partially match "aba" because checking references was
71          done on an "all or nothing" basis. This also applied to repeated          done on an "all or nothing" basis. This also applied to repeated
72          references.          references.
73    
74      (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
75          subject.          subject.
76    
77      (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
78          characters at the end of the subject.          characters at the end of the subject.
79    
80      (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize      (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
# Line 33  Version 8.31 Line 83  Version 8.31
83      (e) When newline was set to CRLF, the metacharacter "." did not recognize      (e) When newline was set to CRLF, the metacharacter "." did not recognize
84          a partial match for a CR character at the end of the subject string.          a partial match for a CR character at the end of the subject string.
85    
86  6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when  6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
87      running pcretest, the text "(JIT)" added to the output whenever JIT is      running pcretest, the text "(JIT)" added to the output whenever JIT is
88      actually used to run the match.      actually used to run the match.
89    
90  7.  Individual JIT compile options can be set in pcretest by following -s+[+]  7.  Individual JIT compile options can be set in pcretest by following -s+[+]
91      or /S+[+] with a digit between 1 and 7.      or /S+[+] with a digit between 1 and 7.
92    
93  8.  OP_NOT now supports any UTF character not just single-byte ones.  8.  OP_NOT now supports any UTF character not just single-byte ones.
# Line 46  Version 8.31 Line 96  Version 8.31
96    
97  10. The command "./RunTest list" lists the available tests without actually  10. The command "./RunTest list" lists the available tests without actually
98      running any of them. (Because I keep forgetting what they all are.)      running any of them. (Because I keep forgetting what they all are.)
99    
100  11. Add PCRE_INFO_MAXLOOKBEHIND.  11. Add PCRE_INFO_MAXLOOKBEHIND.
101    
102  12. Applied a (slightly modified) user-supplied patch that improves performance  12. Applied a (slightly modified) user-supplied patch that improves performance
103      when the heap is used for recursion (compiled with --disable-stack-for-      when the heap is used for recursion (compiled with --disable-stack-for-
104      recursion). Instead of malloc and free for each heap frame each time a      recursion). Instead of malloc and free for each heap frame each time a
105      logical recursion happens, frames are retained on a chain and re-used where      logical recursion happens, frames are retained on a chain and re-used where
106      possible. This sometimes gives as much as 30% improvement.      possible. This sometimes gives as much as 30% improvement.
107    
108  13. As documented, (*COMMIT) is now confined to within a recursive subpattern  13. As documented, (*COMMIT) is now confined to within a recursive subpattern
109      call.      call.
110    
111  14. As documented, (*COMMIT) is now confined to within a positive assertion.  14. As documented, (*COMMIT) is now confined to within a positive assertion.
112    
113  15. It is now possible to link pcretest with libedit as an alternative to  15. It is now possible to link pcretest with libedit as an alternative to
114      libreadline.      libreadline.
115    
116  16. (*COMMIT) control verb is now supported by the JIT compiler.  16. (*COMMIT) control verb is now supported by the JIT compiler.
117    
118  6.  The Unicode data tables have been updated to Unicode 6.1.0.  17. The Unicode data tables have been updated to Unicode 6.1.0.
119    
120    18. Added --file-list option to pcregrep.
121    
122    19. Added binary file support to pcregrep, including the -a, --binary-files,
123        -I, and --text options.
124    
125    20. The madvise function is renamed for posix_madvise for QNX compatibility
126        reasons. Fixed by Giuseppe D'Angelo.
127    
128    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
129    
130    22. Changed the option for creating symbolic links for 16-bit man pages from
131        -s to -sf so that re-installing does not cause issues.
132    
133    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
134    
135    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
136        matches in certain environments (the workspace was not being correctly
137        retained). Also added to pcre_dfa_exec() a simple plausibility check on
138        some of the workspace data at the beginning of a restart.
139    
140    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
141        was not doing so when it should - probably a typo introduced by SVN 528
142        (change 8.10/14).
143    
144    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
145        \w+ when the character tables indicated that \x{c4} was a word character.
146        There were several related cases, all because the tests for doing a table
147        lookup were testing for characters less than 127 instead of 255.
148    
149    27. If a pattern contains capturing parentheses that are not used in a match,
150        their slots in the ovector are set to -1. For those that are higher than
151        any matched groups, this happens at the end of processing. In the case when
152        there were back references that the ovector was too small to contain
153        (causing temporary malloc'd memory to be used during matching), and the
154        highest capturing number was not used, memory off the end of the ovector
155        was incorrectly being set to -1. (It was using the size of the temporary
156        memory instead of the true size.)
157    
158    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
159        ovector size, it uses memory at the end of the block that it has got.
160    
161    29. Check for an overlong MARK name and give an error at compile time. The
162        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
163    
164    30. JIT compiler update.
165    
166    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
167        Rill for the patch.
168    
169    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
170    
171    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
172    
173    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
174        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
175        was enabled.
176    
177    35. Improve JIT code generation for greedy plus quantifier.
178    
179    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
180        1 to "aa" instead of to an empty string. The bug affected repeated groups
181        that could potentially match an empty string.
182    
183    37. Optimizing single character iterators in JIT.
184    
185    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
186        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
187        codepoints that are too big for the mode are faulted, and in a UTF mode,
188        disallowed codepoints are also faulted.
189    
190    39. If PCRE was compiled with UTF support, in three places in the DFA
191        matcher there was code that should only have been obeyed in UTF mode, but
192        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
193        processing when bytes with values greater than 127 were present. In 16-bit
194        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
195        both cases the values are those that cannot be the first data item in a UTF
196        character. The three items that might have provoked this were recursions,
197        possessively repeated groups, and atomic groups.
198    
199    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
200        and pcregrep, because some OS require shared objects to be explicitly
201        passed to ld, causing the link step to fail if they are not.
202    
203    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
204        mode, patterns that started with \h* or \R* might be incorrectly matched.
205    
206    
207  Version 8.30 04-February-2012  Version 8.30 04-February-2012

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