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revision 926 by ph10, Wed Feb 22 15:01:32 2012 UTC revision 1025 by ph10, Wed Aug 29 11:24:23 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    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    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
60    
61    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
62        structure could go wrong in environments where size_t is not the same size
63        as int.
64    
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
67    
68    
69    
70    Version 8.31 06-July-2012
71    -------------------------
72    
73  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
74    
75  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
76    
77  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
78      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
79      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
80    
81  4.  Partial matching support is added to the JIT compiler.  4.  Partial matching support is added to the JIT compiler.
82    
83  5.  Fixed several bugs concerned with partial matching of items that consist  5.  Fixed several bugs concerned with partial matching of items that consist
84      of more than one character:      of more than one character:
85    
86      (a) /^(..)\1/ did not partially match "aba" because checking references was      (a) /^(..)\1/ did not partially match "aba" because checking references was
87          done on an "all or nothing" basis. This also applied to repeated          done on an "all or nothing" basis. This also applied to repeated
88          references.          references.
89    
90      (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
91          subject.          subject.
92    
93      (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
94          characters at the end of the subject.          characters at the end of the subject.
95    
96      (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
97          a partial match for the string "\r".          a partial match for the string "\r".
98    
99      (e) When newline was set to CRLF, the metacharacter "." did not recognize      (e) When newline was set to CRLF, the metacharacter "." did not recognize
100          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.
101    
102  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
103      running pcretest, the text "(JIT)" added to the output whenever JIT is      running pcretest, the text "(JIT)" added to the output whenever JIT is
104      actually used to run the match.      actually used to run the match.
105    
106  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+[+]
107      or /S+[+] with a digit between 1 and 7.      or /S+[+] with a digit between 1 and 7.
108    
109  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.
110    
111    9.  (*MARK) control verb is now supported by the JIT compiler.
112    
113    10. The command "./RunTest list" lists the available tests without actually
114        running any of them. (Because I keep forgetting what they all are.)
115    
116    11. Add PCRE_INFO_MAXLOOKBEHIND.
117    
118    12. Applied a (slightly modified) user-supplied patch that improves performance
119        when the heap is used for recursion (compiled with --disable-stack-for-
120        recursion). Instead of malloc and free for each heap frame each time a
121        logical recursion happens, frames are retained on a chain and re-used where
122        possible. This sometimes gives as much as 30% improvement.
123    
124    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
125        call.
126    
127    14. As documented, (*COMMIT) is now confined to within a positive assertion.
128    
129    15. It is now possible to link pcretest with libedit as an alternative to
130        libreadline.
131    
132    16. (*COMMIT) control verb is now supported by the JIT compiler.
133    
134    17. The Unicode data tables have been updated to Unicode 6.1.0.
135    
136    18. Added --file-list option to pcregrep.
137    
138    19. Added binary file support to pcregrep, including the -a, --binary-files,
139        -I, and --text options.
140    
141    20. The madvise function is renamed for posix_madvise for QNX compatibility
142        reasons. Fixed by Giuseppe D'Angelo.
143    
144    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
145    
146    22. Changed the option for creating symbolic links for 16-bit man pages from
147        -s to -sf so that re-installing does not cause issues.
148    
149    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
150    
151    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
152        matches in certain environments (the workspace was not being correctly
153        retained). Also added to pcre_dfa_exec() a simple plausibility check on
154        some of the workspace data at the beginning of a restart.
155    
156    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
157        was not doing so when it should - probably a typo introduced by SVN 528
158        (change 8.10/14).
159    
160    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
161        \w+ when the character tables indicated that \x{c4} was a word character.
162        There were several related cases, all because the tests for doing a table
163        lookup were testing for characters less than 127 instead of 255.
164    
165    27. If a pattern contains capturing parentheses that are not used in a match,
166        their slots in the ovector are set to -1. For those that are higher than
167        any matched groups, this happens at the end of processing. In the case when
168        there were back references that the ovector was too small to contain
169        (causing temporary malloc'd memory to be used during matching), and the
170        highest capturing number was not used, memory off the end of the ovector
171        was incorrectly being set to -1. (It was using the size of the temporary
172        memory instead of the true size.)
173    
174    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
175        ovector size, it uses memory at the end of the block that it has got.
176    
177    29. Check for an overlong MARK name and give an error at compile time. The
178        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
179    
180    30. JIT compiler update.
181    
182    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
183        Rill for the patch.
184    
185    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
186    
187    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
188    
189    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
190        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
191        was enabled.
192    
193    35. Improve JIT code generation for greedy plus quantifier.
194    
195    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
196        1 to "aa" instead of to an empty string. The bug affected repeated groups
197        that could potentially match an empty string.
198    
199    37. Optimizing single character iterators in JIT.
200    
201    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
202        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
203        codepoints that are too big for the mode are faulted, and in a UTF mode,
204        disallowed codepoints are also faulted.
205    
206    39. If PCRE was compiled with UTF support, in three places in the DFA
207        matcher there was code that should only have been obeyed in UTF mode, but
208        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
209        processing when bytes with values greater than 127 were present. In 16-bit
210        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
211        both cases the values are those that cannot be the first data item in a UTF
212        character. The three items that might have provoked this were recursions,
213        possessively repeated groups, and atomic groups.
214    
215    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
216        and pcregrep, because some OS require shared objects to be explicitly
217        passed to ld, causing the link step to fail if they are not.
218    
219    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
220        mode, patterns that started with \h* or \R* might be incorrectly matched.
221    
222    
223  Version 8.30 04-February-2012  Version 8.30 04-February-2012
224  -----------------------------  -----------------------------

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