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revision 886 by ph10, Tue Jan 17 14:25:07 2012 UTC revision 1011 by ph10, Sat Aug 25 11:36:15 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.30  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 in the interpreters so that it now matches a
54        Unicode extended grapheme cluster.
55    
56    
57    
58    Version 8.31 06-July-2012
59    -------------------------
60    
61    1.  Fixing a wrong JIT test case and some compiler warnings.
62    
63    2.  Removed a bashism from the RunTest script.
64    
65    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
66        to unsigned type, result still unsigned" that was given by an MS compiler
67        on encountering the code "-sizeof(xxx)".
68    
69    4.  Partial matching support is added to the JIT compiler.
70    
71    5.  Fixed several bugs concerned with partial matching of items that consist
72        of more than one character:
73    
74        (a) /^(..)\1/ did not partially match "aba" because checking references was
75            done on an "all or nothing" basis. This also applied to repeated
76            references.
77    
78        (b) \R did not give a hard partial match if \r was found at the end of the
79            subject.
80    
81        (c) \X did not give a hard partial match after matching one or more
82            characters at the end of the subject.
83    
84        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
85            a partial match for the string "\r".
86    
87        (e) When newline was set to CRLF, the metacharacter "." did not recognize
88            a partial match for a CR character at the end of the subject string.
89    
90    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
91        running pcretest, the text "(JIT)" added to the output whenever JIT is
92        actually used to run the match.
93    
94    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
95        or /S+[+] with a digit between 1 and 7.
96    
97    8.  OP_NOT now supports any UTF character not just single-byte ones.
98    
99    9.  (*MARK) control verb is now supported by the JIT compiler.
100    
101    10. The command "./RunTest list" lists the available tests without actually
102        running any of them. (Because I keep forgetting what they all are.)
103    
104    11. Add PCRE_INFO_MAXLOOKBEHIND.
105    
106    12. Applied a (slightly modified) user-supplied patch that improves performance
107        when the heap is used for recursion (compiled with --disable-stack-for-
108        recursion). Instead of malloc and free for each heap frame each time a
109        logical recursion happens, frames are retained on a chain and re-used where
110        possible. This sometimes gives as much as 30% improvement.
111    
112    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
113        call.
114    
115    14. As documented, (*COMMIT) is now confined to within a positive assertion.
116    
117    15. It is now possible to link pcretest with libedit as an alternative to
118        libreadline.
119    
120    16. (*COMMIT) control verb is now supported by the JIT compiler.
121    
122    17. The Unicode data tables have been updated to Unicode 6.1.0.
123    
124    18. Added --file-list option to pcregrep.
125    
126    19. Added binary file support to pcregrep, including the -a, --binary-files,
127        -I, and --text options.
128    
129    20. The madvise function is renamed for posix_madvise for QNX compatibility
130        reasons. Fixed by Giuseppe D'Angelo.
131    
132    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
133    
134    22. Changed the option for creating symbolic links for 16-bit man pages from
135        -s to -sf so that re-installing does not cause issues.
136    
137    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
138    
139    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
140        matches in certain environments (the workspace was not being correctly
141        retained). Also added to pcre_dfa_exec() a simple plausibility check on
142        some of the workspace data at the beginning of a restart.
143    
144    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
145        was not doing so when it should - probably a typo introduced by SVN 528
146        (change 8.10/14).
147    
148    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
149        \w+ when the character tables indicated that \x{c4} was a word character.
150        There were several related cases, all because the tests for doing a table
151        lookup were testing for characters less than 127 instead of 255.
152    
153    27. If a pattern contains capturing parentheses that are not used in a match,
154        their slots in the ovector are set to -1. For those that are higher than
155        any matched groups, this happens at the end of processing. In the case when
156        there were back references that the ovector was too small to contain
157        (causing temporary malloc'd memory to be used during matching), and the
158        highest capturing number was not used, memory off the end of the ovector
159        was incorrectly being set to -1. (It was using the size of the temporary
160        memory instead of the true size.)
161    
162    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
163        ovector size, it uses memory at the end of the block that it has got.
164    
165    29. Check for an overlong MARK name and give an error at compile time. The
166        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
167    
168    30. JIT compiler update.
169    
170    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
171        Rill for the patch.
172    
173    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
174    
175    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
176    
177    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
178        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
179        was enabled.
180    
181    35. Improve JIT code generation for greedy plus quantifier.
182    
183    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
184        1 to "aa" instead of to an empty string. The bug affected repeated groups
185        that could potentially match an empty string.
186    
187    37. Optimizing single character iterators in JIT.
188    
189    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
190        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
191        codepoints that are too big for the mode are faulted, and in a UTF mode,
192        disallowed codepoints are also faulted.
193    
194    39. If PCRE was compiled with UTF support, in three places in the DFA
195        matcher there was code that should only have been obeyed in UTF mode, but
196        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
197        processing when bytes with values greater than 127 were present. In 16-bit
198        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
199        both cases the values are those that cannot be the first data item in a UTF
200        character. The three items that might have provoked this were recursions,
201        possessively repeated groups, and atomic groups.
202    
203    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
204        and pcregrep, because some OS require shared objects to be explicitly
205        passed to ld, causing the link step to fail if they are not.
206    
207    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
208        mode, patterns that started with \h* or \R* might be incorrectly matched.
209    
210    
211    Version 8.30 04-February-2012
212    -----------------------------
213    
214  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
215      name is defined in ctype.h.      name is defined in ctype.h.
216    
# Line 32  Version 8.30 Line 239  Version 8.30
239    
240  8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size  8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
241      rounding is not applied in this particular case).      rounding is not applied in this particular case).
242    
243  9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected  9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
244      if they appear, or are escaped, in patterns.      if they appear, or are escaped, in patterns.
   
 10. Get rid of a number of -Wunused-but-set-variable warnings.  
245    
246  11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark  10. Get rid of a number of -Wunused-but-set-variable warnings.
247      "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.  
248      Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern  11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
249      also returns the mark "x". This bug applied to capturing parentheses,      "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
250      non-capturing parentheses, and atomic parentheses.      Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
251        also returns the mark "x". This bug applied to capturing parentheses,
252  12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version      non-capturing parentheses, and atomic parentheses. It also applied to some
253      information out of configure.ac instead of relying on pcre.h.generic, which      assertions.
254      is not stored in the repository.  
255    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
256        information out of configure.ac instead of relying on pcre.h.generic, which
257        is not stored in the repository.
258    
259    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
260        -lreadline.
261    
262    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
263    
264    15. Applied Graycode's patch to put the top-level frame on the stack rather
265        than the heap when not using the stack for recursion. This gives a
266        performance improvement in many cases when recursion is not deep.
267    
268    16. Experimental code added to "pcretest -C" to output the stack frame size.
269    
270    
271  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011

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