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revision 947 by ph10, Sun Mar 4 16:51:13 2012 UTC revision 1024 by ph10, Wed Aug 29 11:08:24 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    
66    
67    Version 8.31 06-July-2012
68    -------------------------
69    
70  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
71    
72  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
73    
74  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
75      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
76      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
77    
78  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 81  Version 8.31
81      of more than one character:      of more than one character:
82    
83      (a) /^(..)\1/ did not partially match "aba" because checking references was      (a) /^(..)\1/ did not partially match "aba" because checking references was
84          done on an "all or nothing" basis. This also applied to repeated          done on an "all or nothing" basis. This also applied to repeated
85          references.          references.
86    
87      (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
88          subject.          subject.
89    
90      (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
91          characters at the end of the subject.          characters at the end of the subject.
92    
93      (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 96  Version 8.31
96      (e) When newline was set to CRLF, the metacharacter "." did not recognize      (e) When newline was set to CRLF, the metacharacter "." did not recognize
97          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.
98    
99  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
100      running pcretest, the text "(JIT)" added to the output whenever JIT is      running pcretest, the text "(JIT)" added to the output whenever JIT is
101      actually used to run the match.      actually used to run the match.
102    
103  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+[+]
104      or /S+[+] with a digit between 1 and 7.      or /S+[+] with a digit between 1 and 7.
105    
106  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 109  Version 8.31
109    
110  10. The command "./RunTest list" lists the available tests without actually  10. The command "./RunTest list" lists the available tests without actually
111      running any of them. (Because I keep forgetting what they all are.)      running any of them. (Because I keep forgetting what they all are.)
112    
113  11. Add PCRE_INFO_MAXLOOKBEHIND.  11. Add PCRE_INFO_MAXLOOKBEHIND.
114    
115  12. Applied a (slightly modified) user-supplied patch that improves performance  12. Applied a (slightly modified) user-supplied patch that improves performance
116      when the heap is used for recursion (compiled with --disable-stack-for-      when the heap is used for recursion (compiled with --disable-stack-for-
117      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
118      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
119      possible. This sometimes gives as much as 30% improvement.      possible. This sometimes gives as much as 30% improvement.
120    
121  13. As documented, (*COMMIT) is now confined to within a recursive subpattern  13. As documented, (*COMMIT) is now confined to within a recursive subpattern
122      call.      call.
123    
124  14. As documented, (*COMMIT) is now confined to within a positive assertion.  14. As documented, (*COMMIT) is now confined to within a positive assertion.
125    
126  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
127      libreadline.      libreadline.
128    
129  16. (*COMMIT) control verb is now supported by the JIT compiler.  16. (*COMMIT) control verb is now supported by the JIT compiler.
# Line 72  Version 8.31 Line 135  Version 8.31
135  19. Added binary file support to pcregrep, including the -a, --binary-files,  19. Added binary file support to pcregrep, including the -a, --binary-files,
136      -I, and --text options.      -I, and --text options.
137    
138    20. The madvise function is renamed for posix_madvise for QNX compatibility
139        reasons. Fixed by Giuseppe D'Angelo.
140    
141    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
142    
143    22. Changed the option for creating symbolic links for 16-bit man pages from
144        -s to -sf so that re-installing does not cause issues.
145    
146    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
147    
148    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
149        matches in certain environments (the workspace was not being correctly
150        retained). Also added to pcre_dfa_exec() a simple plausibility check on
151        some of the workspace data at the beginning of a restart.
152    
153    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
154        was not doing so when it should - probably a typo introduced by SVN 528
155        (change 8.10/14).
156    
157    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
158        \w+ when the character tables indicated that \x{c4} was a word character.
159        There were several related cases, all because the tests for doing a table
160        lookup were testing for characters less than 127 instead of 255.
161    
162    27. If a pattern contains capturing parentheses that are not used in a match,
163        their slots in the ovector are set to -1. For those that are higher than
164        any matched groups, this happens at the end of processing. In the case when
165        there were back references that the ovector was too small to contain
166        (causing temporary malloc'd memory to be used during matching), and the
167        highest capturing number was not used, memory off the end of the ovector
168        was incorrectly being set to -1. (It was using the size of the temporary
169        memory instead of the true size.)
170    
171    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
172        ovector size, it uses memory at the end of the block that it has got.
173    
174    29. Check for an overlong MARK name and give an error at compile time. The
175        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
176    
177    30. JIT compiler update.
178    
179    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
180        Rill for the patch.
181    
182    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
183    
184    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
185    
186    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
187        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
188        was enabled.
189    
190    35. Improve JIT code generation for greedy plus quantifier.
191    
192    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
193        1 to "aa" instead of to an empty string. The bug affected repeated groups
194        that could potentially match an empty string.
195    
196    37. Optimizing single character iterators in JIT.
197    
198    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
199        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
200        codepoints that are too big for the mode are faulted, and in a UTF mode,
201        disallowed codepoints are also faulted.
202    
203    39. If PCRE was compiled with UTF support, in three places in the DFA
204        matcher there was code that should only have been obeyed in UTF mode, but
205        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
206        processing when bytes with values greater than 127 were present. In 16-bit
207        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
208        both cases the values are those that cannot be the first data item in a UTF
209        character. The three items that might have provoked this were recursions,
210        possessively repeated groups, and atomic groups.
211    
212    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
213        and pcregrep, because some OS require shared objects to be explicitly
214        passed to ld, causing the link step to fail if they are not.
215    
216    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
217        mode, patterns that started with \h* or \R* might be incorrectly matched.
218    
219    
220  Version 8.30 04-February-2012  Version 8.30 04-February-2012
221  -----------------------------  -----------------------------

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