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revision 957 by ph10, Wed Apr 4 16:18:29 2012 UTC revision 1022 by ph10, Tue Aug 28 12:28:15 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    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
60    
61    
62    
63    Version 8.31 06-July-2012
64    -------------------------
65    
66  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
67    
68  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
69    
70  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
71      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
72      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
73    
74  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 77  Version 8.31
77      of more than one character:      of more than one character:
78    
79      (a) /^(..)\1/ did not partially match "aba" because checking references was      (a) /^(..)\1/ did not partially match "aba" because checking references was
80          done on an "all or nothing" basis. This also applied to repeated          done on an "all or nothing" basis. This also applied to repeated
81          references.          references.
82    
83      (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
84          subject.          subject.
85    
86      (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
87          characters at the end of the subject.          characters at the end of the subject.
88    
89      (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 92  Version 8.31
92      (e) When newline was set to CRLF, the metacharacter "." did not recognize      (e) When newline was set to CRLF, the metacharacter "." did not recognize
93          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.
94    
95  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
96      running pcretest, the text "(JIT)" added to the output whenever JIT is      running pcretest, the text "(JIT)" added to the output whenever JIT is
97      actually used to run the match.      actually used to run the match.
98    
99  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+[+]
100      or /S+[+] with a digit between 1 and 7.      or /S+[+] with a digit between 1 and 7.
101    
102  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 105  Version 8.31
105    
106  10. The command "./RunTest list" lists the available tests without actually  10. The command "./RunTest list" lists the available tests without actually
107      running any of them. (Because I keep forgetting what they all are.)      running any of them. (Because I keep forgetting what they all are.)
108    
109  11. Add PCRE_INFO_MAXLOOKBEHIND.  11. Add PCRE_INFO_MAXLOOKBEHIND.
110    
111  12. Applied a (slightly modified) user-supplied patch that improves performance  12. Applied a (slightly modified) user-supplied patch that improves performance
112      when the heap is used for recursion (compiled with --disable-stack-for-      when the heap is used for recursion (compiled with --disable-stack-for-
113      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
114      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
115      possible. This sometimes gives as much as 30% improvement.      possible. This sometimes gives as much as 30% improvement.
116    
117  13. As documented, (*COMMIT) is now confined to within a recursive subpattern  13. As documented, (*COMMIT) is now confined to within a recursive subpattern
118      call.      call.
119    
120  14. As documented, (*COMMIT) is now confined to within a positive assertion.  14. As documented, (*COMMIT) is now confined to within a positive assertion.
121    
122  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
123      libreadline.      libreadline.
124    
125  16. (*COMMIT) control verb is now supported by the JIT compiler.  16. (*COMMIT) control verb is now supported by the JIT compiler.
# Line 80  Version 8.31 Line 139  Version 8.31
139  22. Changed the option for creating symbolic links for 16-bit man pages from  22. Changed the option for creating symbolic links for 16-bit man pages from
140      -s to -sf so that re-installing does not cause issues.      -s to -sf so that re-installing does not cause issues.
141    
142    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
143    
144    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
145        matches in certain environments (the workspace was not being correctly
146        retained). Also added to pcre_dfa_exec() a simple plausibility check on
147        some of the workspace data at the beginning of a restart.
148    
149    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
150        was not doing so when it should - probably a typo introduced by SVN 528
151        (change 8.10/14).
152    
153    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
154        \w+ when the character tables indicated that \x{c4} was a word character.
155        There were several related cases, all because the tests for doing a table
156        lookup were testing for characters less than 127 instead of 255.
157    
158    27. If a pattern contains capturing parentheses that are not used in a match,
159        their slots in the ovector are set to -1. For those that are higher than
160        any matched groups, this happens at the end of processing. In the case when
161        there were back references that the ovector was too small to contain
162        (causing temporary malloc'd memory to be used during matching), and the
163        highest capturing number was not used, memory off the end of the ovector
164        was incorrectly being set to -1. (It was using the size of the temporary
165        memory instead of the true size.)
166    
167    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
168        ovector size, it uses memory at the end of the block that it has got.
169    
170    29. Check for an overlong MARK name and give an error at compile time. The
171        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
172    
173    30. JIT compiler update.
174    
175    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
176        Rill for the patch.
177    
178    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
179    
180    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
181    
182    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
183        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
184        was enabled.
185    
186    35. Improve JIT code generation for greedy plus quantifier.
187    
188    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
189        1 to "aa" instead of to an empty string. The bug affected repeated groups
190        that could potentially match an empty string.
191    
192    37. Optimizing single character iterators in JIT.
193    
194    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
195        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
196        codepoints that are too big for the mode are faulted, and in a UTF mode,
197        disallowed codepoints are also faulted.
198    
199    39. If PCRE was compiled with UTF support, in three places in the DFA
200        matcher there was code that should only have been obeyed in UTF mode, but
201        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
202        processing when bytes with values greater than 127 were present. In 16-bit
203        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
204        both cases the values are those that cannot be the first data item in a UTF
205        character. The three items that might have provoked this were recursions,
206        possessively repeated groups, and atomic groups.
207    
208    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
209        and pcregrep, because some OS require shared objects to be explicitly
210        passed to ld, causing the link step to fail if they are not.
211    
212    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
213        mode, patterns that started with \h* or \R* might be incorrectly matched.
214    
215    
216  Version 8.30 04-February-2012  Version 8.30 04-February-2012
217  -----------------------------  -----------------------------

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