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revision 942 by ph10, Tue Feb 28 14:50:31 2012 UTC revision 1019 by ph10, Mon Aug 27 13:15:02 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    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
55    
56    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
57        out POSIX threads when JIT support is configured.
58    
59    
60    
61    Version 8.31 06-July-2012
62    -------------------------
63    
64  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
65    
66  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
67    
68  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
69      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
70      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
71    
72  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 75  Version 8.31
75      of more than one character:      of more than one character:
76    
77      (a) /^(..)\1/ did not partially match "aba" because checking references was      (a) /^(..)\1/ did not partially match "aba" because checking references was
78          done on an "all or nothing" basis. This also applied to repeated          done on an "all or nothing" basis. This also applied to repeated
79          references.          references.
80    
81      (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
82          subject.          subject.
83    
84      (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
85          characters at the end of the subject.          characters at the end of the subject.
86    
87      (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 90  Version 8.31
90      (e) When newline was set to CRLF, the metacharacter "." did not recognize      (e) When newline was set to CRLF, the metacharacter "." did not recognize
91          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.
92    
93  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
94      running pcretest, the text "(JIT)" added to the output whenever JIT is      running pcretest, the text "(JIT)" added to the output whenever JIT is
95      actually used to run the match.      actually used to run the match.
96    
97  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+[+]
98      or /S+[+] with a digit between 1 and 7.      or /S+[+] with a digit between 1 and 7.
99    
100  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 103  Version 8.31
103    
104  10. The command "./RunTest list" lists the available tests without actually  10. The command "./RunTest list" lists the available tests without actually
105      running any of them. (Because I keep forgetting what they all are.)      running any of them. (Because I keep forgetting what they all are.)
106    
107  11. Add PCRE_INFO_MAXLOOKBEHIND.  11. Add PCRE_INFO_MAXLOOKBEHIND.
108    
109  12. Applied a (slightly modified) user-supplied patch that improves performance  12. Applied a (slightly modified) user-supplied patch that improves performance
110      when the heap is used for recursion (compiled with --disable-stack-for-      when the heap is used for recursion (compiled with --disable-stack-for-
111      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
112      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
113      possible. This sometimes gives as much as 30% improvement.      possible. This sometimes gives as much as 30% improvement.
114    
115  13. As documented, (*COMMIT) is now confined to within a recursive subpattern  13. As documented, (*COMMIT) is now confined to within a recursive subpattern
116      call.      call.
117    
118  14. As documented, (*COMMIT) is now confined to within a positive assertion.  14. As documented, (*COMMIT) is now confined to within a positive assertion.
119    
120  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
121      libreadline.      libreadline.
122    
123  16. (*COMMIT) control verb is now supported by the JIT compiler.  16. (*COMMIT) control verb is now supported by the JIT compiler.
124    
125  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.
126    
127    18. Added --file-list option to pcregrep.
128    
129    19. Added binary file support to pcregrep, including the -a, --binary-files,
130        -I, and --text options.
131    
132    20. The madvise function is renamed for posix_madvise for QNX compatibility
133        reasons. Fixed by Giuseppe D'Angelo.
134    
135    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
136    
137    22. Changed the option for creating symbolic links for 16-bit man pages from
138        -s to -sf so that re-installing does not cause issues.
139    
140    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
141    
142    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
143        matches in certain environments (the workspace was not being correctly
144        retained). Also added to pcre_dfa_exec() a simple plausibility check on
145        some of the workspace data at the beginning of a restart.
146    
147    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
148        was not doing so when it should - probably a typo introduced by SVN 528
149        (change 8.10/14).
150    
151    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
152        \w+ when the character tables indicated that \x{c4} was a word character.
153        There were several related cases, all because the tests for doing a table
154        lookup were testing for characters less than 127 instead of 255.
155    
156    27. If a pattern contains capturing parentheses that are not used in a match,
157        their slots in the ovector are set to -1. For those that are higher than
158        any matched groups, this happens at the end of processing. In the case when
159        there were back references that the ovector was too small to contain
160        (causing temporary malloc'd memory to be used during matching), and the
161        highest capturing number was not used, memory off the end of the ovector
162        was incorrectly being set to -1. (It was using the size of the temporary
163        memory instead of the true size.)
164    
165    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
166        ovector size, it uses memory at the end of the block that it has got.
167    
168    29. Check for an overlong MARK name and give an error at compile time. The
169        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
170    
171    30. JIT compiler update.
172    
173    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
174        Rill for the patch.
175    
176    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
177    
178    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
179    
180    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
181        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
182        was enabled.
183    
184    35. Improve JIT code generation for greedy plus quantifier.
185    
186    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
187        1 to "aa" instead of to an empty string. The bug affected repeated groups
188        that could potentially match an empty string.
189    
190    37. Optimizing single character iterators in JIT.
191    
192    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
193        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
194        codepoints that are too big for the mode are faulted, and in a UTF mode,
195        disallowed codepoints are also faulted.
196    
197    39. If PCRE was compiled with UTF support, in three places in the DFA
198        matcher there was code that should only have been obeyed in UTF mode, but
199        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
200        processing when bytes with values greater than 127 were present. In 16-bit
201        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
202        both cases the values are those that cannot be the first data item in a UTF
203        character. The three items that might have provoked this were recursions,
204        possessively repeated groups, and atomic groups.
205    
206    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
207        and pcregrep, because some OS require shared objects to be explicitly
208        passed to ld, causing the link step to fail if they are not.
209    
210    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
211        mode, patterns that started with \h* or \R* might be incorrectly matched.
212    
213    
214  Version 8.30 04-February-2012  Version 8.30 04-February-2012

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