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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 971 by ph10, Fri Jun 1 16:29:43 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.31
5  ------------  -----------------------------
6    
7    1.  Fixing a wrong JIT test case and some compiler warnings.
8    
9    2.  Removed a bashism from the RunTest script.
10    
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
14    
15    4.  Partial matching support is added to the JIT compiler.
16    
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
19    
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
23    
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
26    
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
29    
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
32    
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
35    
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
39    
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
42    
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
44    
45    9.  (*MARK) control verb is now supported by the JIT compiler.
46    
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
49    
50    11. Add PCRE_INFO_MAXLOOKBEHIND.
51    
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
57    
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
60    
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
62    
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
65    
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
67    
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
69    
70    18. Added --file-list option to pcregrep.
71    
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
74    
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
77    
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
79    
80    22. Changed the option for creating symbolic links for 16-bit man pages from
81        -s to -sf so that re-installing does not cause issues.
82    
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
84    
85    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
86        matches in certain environments (the workspace was not being correctly
87        retained). Also added to pcre_dfa_exec() a simple plausibility check on
88        some of the workspace data at the beginning of a restart.
89    
90    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
91        was not doing so when it should - probably a typo introduced by SVN 528
92        (change 8.10/14).
93    
94    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
95        \w+ when the character tables indicated that \x{c4} was a word character.
96        There were several related cases, all because the tests for doing a table
97        lookup were testing for characters less than 127 instead of 255.
98    
99    27. If a pattern contains capturing parentheses that are not used in a match,
100        their slots in the ovector are set to -1. For those that are higher than
101        any matched groups, this happens at the end of processing. In the case when
102        there were back references that the ovector was too small to contain
103        (causing temporary malloc'd memory to be used during matching), and the
104        highest capturing number was not used, memory off the end of the ovector
105        was incorrectly being set to -1. (It was using the size of the temporary
106        memory instead of the true size.)
107    
108    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
109        ovector size, it uses memory at the end of the block that it has got.
110    
111    29. Check for an overlong MARK name and give an error at compile time. The
112        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
113    
114    30. JIT compiler update.
115    
116    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
117        Rill for the patch.
118    
119    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
120    
121    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
122    
123    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
124        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
125        was enabled.
126    
127    
128    Version 8.30 04-February-2012
129    -----------------------------
130    
131    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
132        name is defined in ctype.h.
133    
134    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
135        only in quite long subpatterns.
136    
137    3.  Removed the function pcre_info(), which has been obsolete and deprecated
138        since it was replaced by pcre_fullinfo() in February 2000.
139    
140    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
141        match a (*MARK), and the match failed at the start of the subject, a
142        reference to memory before the start of the subject could occur. This bug
143        was introduced by fix 17 of release 8.21.
144    
145    5.  A reference to an unset group with zero minimum repetition was giving
146        totally wrong answers (in non-JavaScript-compatibility mode). For example,
147        /(another)?(\1?)test/ matched against "hello world test". This bug was
148        introduced in release 8.13.
149    
150    6.  Add support for 16-bit character strings (a large amount of work involving
151        many changes and refactorings).
152    
153    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
154        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
155        from a file.
156    
157    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
158        rounding is not applied in this particular case).
159    
160    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
161        if they appear, or are escaped, in patterns.
162    
163    10. Get rid of a number of -Wunused-but-set-variable warnings.
164    
165    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
166        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
167        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
168        also returns the mark "x". This bug applied to capturing parentheses,
169        non-capturing parentheses, and atomic parentheses. It also applied to some
170        assertions.
171    
172    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
173        information out of configure.ac instead of relying on pcre.h.generic, which
174        is not stored in the repository.
175    
176    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
177        -lreadline.
178    
179    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
180    
181    15. Applied Graycode's patch to put the top-level frame on the stack rather
182        than the heap when not using the stack for recursion. This gives a
183        performance improvement in many cases when recursion is not deep.
184    
185    16. Experimental code added to "pcretest -C" to output the stack frame size.
186    
187    
188    Version 8.21 12-Dec-2011
189    ------------------------
190    
191  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
192    
193    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
194        are added as well.
195    
196    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
197        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
198        calling _pcre_jit_exec. Some extra comments are added.
199    
200    4.  (*MARK) settings inside atomic groups that do not contain any capturing
201        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
202        was introduced by change 18 for 8.20.
203    
204    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
205        ECMA-262 standard.
206    
207    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
208        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
209        This bug was probably introduced by change 9 of 8.13.
210    
211    7.  While fixing 6 above, I noticed that a number of other items were being
212        incorrectly rejected as "not fixed length". This arose partly because newer
213        opcodes had not been added to the fixed-length checking code. I have (a)
214        corrected the bug and added tests for these items, and (b) arranged for an
215        error to occur if an unknown opcode is encountered while checking for fixed
216        length instead of just assuming "not fixed length". The items that were
217        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
218        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
219        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
220    
221    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
222        being incorrectly compiled and would have given unpredicatble results.
223    
224    9.  A possessively repeated subpattern with minimum repeat count greater than
225        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
226        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
227        the first (A) could occur when it should not.
228    
229    10. Add a cast and remove a redundant test from the code.
230    
231    11. JIT should use pcre_malloc/pcre_free for allocation.
232    
233    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
234        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
235        is anything other than /usr, -L is still shown).
236    
237    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
238    
239    14. Perl does not support \N without a following name in a [] class; PCRE now
240        also gives an error.
241    
242    15. If a forward reference was repeated with an upper limit of around 2000,
243        it caused the error "internal error: overran compiling workspace". The
244        maximum number of forward references (including repeats) was limited by the
245        internal workspace, and dependent on the LINK_SIZE. The code has been
246        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
247        the default depends on LINK_SIZE. There is a new upper limit (for safety)
248        of around 200,000 forward references. While doing this, I also speeded up
249        the filling in of repeated forward references.
250    
251    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
252        incorrectly expecting the subject to contain another "a" after the start.
253    
254    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
255        in the match, the SKIP should be ignored. This was not happening; instead
256        the SKIP was being treated as NOMATCH. For patterns such as
257        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
258        tested.
259    
260    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
261        now much more compatible with Perl, in particular in cases where the result
262        is a non-match for a non-anchored pattern. For example, if
263        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
264        "m", where previously it did not return a name. A side effect of this
265        change is that for partial matches, the last encountered mark name is
266        returned, as for non matches. A number of tests that were previously not
267        Perl-compatible have been moved into the Perl-compatible test files. The
268        refactoring has had the pleasing side effect of removing one argument from
269        the match() function, thus reducing its stack requirements.
270    
271    19. If the /S+ option was used in pcretest to study a pattern using JIT,
272        subsequent uses of /S (without +) incorrectly behaved like /S+.
273    
274    21. Retrieve executable code size support for the JIT compiler and fixing
275        some warnings.
276    
277    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
278        not work when the shorter character appeared right at the end of the
279        subject string.
280    
281    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
282        systems.
283    
284    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
285        output it when the /M option is used in pcretest.
286    
287    25. The CheckMan script was not being included in the distribution. Also, added
288        an explicit "perl" to run Perl scripts from the PrepareRelease script
289        because this is reportedly needed in Windows.
290    
291    26. If study data was being save in a file and studying had not found a set of
292        "starts with" bytes for the pattern, the data written to the file (though
293        never used) was taken from uninitialized memory and so caused valgrind to
294        complain.
295    
296    27. Updated RunTest.bat as provided by Sheri Pierce.
297    
298    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
299    
300    29. Computation of memory usage for the table of capturing group names was
301        giving an unnecessarily large value.
302    
303    
304  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
305  ------------------------  ------------------------

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