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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 977 by zherczeg, Sun Jun 17 06:20:52 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  Version 8.31 02-June-2012
5  ------------  -------------------------
7    1.  Fixing a wrong JIT test case and some compiler warnings.
9    2.  Removed a bashism from the RunTest script.
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)".
15    4.  Partial matching support is added to the JIT compiler.
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
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.
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
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.
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.
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
45    9.  (*MARK) control verb is now supported by the JIT compiler.
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.)
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.
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
70    18. Added --file-list option to pcregrep.
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
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.
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
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.
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).
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.
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.)
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.
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.
114    30. JIT compiler update.
116    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
117        Rill for the patch.
119    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
121    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
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.
127    35. Improve JIT code generation for greedy plus quantifier.
129    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
130        1 to "aa" instead of to an empty string. The bug affected repeated groups
131        that could potentially match an empty string.
133    37. Optimizing single character iterators in JIT.
136    Version 8.30 04-February-2012
137    -----------------------------
139    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
140        name is defined in ctype.h.
142    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
143        only in quite long subpatterns.
145    3.  Removed the function pcre_info(), which has been obsolete and deprecated
146        since it was replaced by pcre_fullinfo() in February 2000.
148    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
149        match a (*MARK), and the match failed at the start of the subject, a
150        reference to memory before the start of the subject could occur. This bug
151        was introduced by fix 17 of release 8.21.
153    5.  A reference to an unset group with zero minimum repetition was giving
154        totally wrong answers (in non-JavaScript-compatibility mode). For example,
155        /(another)?(\1?)test/ matched against "hello world test". This bug was
156        introduced in release 8.13.
158    6.  Add support for 16-bit character strings (a large amount of work involving
159        many changes and refactorings).
161    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
162        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
163        from a file.
165    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
166        rounding is not applied in this particular case).
168    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
169        if they appear, or are escaped, in patterns.
171    10. Get rid of a number of -Wunused-but-set-variable warnings.
173    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
174        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
175        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
176        also returns the mark "x". This bug applied to capturing parentheses,
177        non-capturing parentheses, and atomic parentheses. It also applied to some
178        assertions.
180    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
181        information out of configure.ac instead of relying on pcre.h.generic, which
182        is not stored in the repository.
184    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
185        -lreadline.
187    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
189    15. Applied Graycode's patch to put the top-level frame on the stack rather
190        than the heap when not using the stack for recursion. This gives a
191        performance improvement in many cases when recursion is not deep.
193    16. Experimental code added to "pcretest -C" to output the stack frame size.
196    Version 8.21 12-Dec-2011
197    ------------------------
199  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
201    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
202        are added as well.
204    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
205        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
206        calling _pcre_jit_exec. Some extra comments are added.
208    4.  (*MARK) settings inside atomic groups that do not contain any capturing
209        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
210        was introduced by change 18 for 8.20.
212    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
213        ECMA-262 standard.
215    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
216        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
217        This bug was probably introduced by change 9 of 8.13.
219    7.  While fixing 6 above, I noticed that a number of other items were being
220        incorrectly rejected as "not fixed length". This arose partly because newer
221        opcodes had not been added to the fixed-length checking code. I have (a)
222        corrected the bug and added tests for these items, and (b) arranged for an
223        error to occur if an unknown opcode is encountered while checking for fixed
224        length instead of just assuming "not fixed length". The items that were
225        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
226        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
227        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
229    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
230        being incorrectly compiled and would have given unpredicatble results.
232    9.  A possessively repeated subpattern with minimum repeat count greater than
233        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
234        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
235        the first (A) could occur when it should not.
237    10. Add a cast and remove a redundant test from the code.
239    11. JIT should use pcre_malloc/pcre_free for allocation.
241    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
242        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
243        is anything other than /usr, -L is still shown).
245    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
247    14. Perl does not support \N without a following name in a [] class; PCRE now
248        also gives an error.
250    15. If a forward reference was repeated with an upper limit of around 2000,
251        it caused the error "internal error: overran compiling workspace". The
252        maximum number of forward references (including repeats) was limited by the
253        internal workspace, and dependent on the LINK_SIZE. The code has been
254        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
255        the default depends on LINK_SIZE. There is a new upper limit (for safety)
256        of around 200,000 forward references. While doing this, I also speeded up
257        the filling in of repeated forward references.
259    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
260        incorrectly expecting the subject to contain another "a" after the start.
262    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
263        in the match, the SKIP should be ignored. This was not happening; instead
264        the SKIP was being treated as NOMATCH. For patterns such as
265        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
266        tested.
268    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
269        now much more compatible with Perl, in particular in cases where the result
270        is a non-match for a non-anchored pattern. For example, if
271        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
272        "m", where previously it did not return a name. A side effect of this
273        change is that for partial matches, the last encountered mark name is
274        returned, as for non matches. A number of tests that were previously not
275        Perl-compatible have been moved into the Perl-compatible test files. The
276        refactoring has had the pleasing side effect of removing one argument from
277        the match() function, thus reducing its stack requirements.
279    19. If the /S+ option was used in pcretest to study a pattern using JIT,
280        subsequent uses of /S (without +) incorrectly behaved like /S+.
282    21. Retrieve executable code size support for the JIT compiler and fixing
283        some warnings.
285    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
286        not work when the shorter character appeared right at the end of the
287        subject string.
289    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
290        systems.
292    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
293        output it when the /M option is used in pcretest.
295    25. The CheckMan script was not being included in the distribution. Also, added
296        an explicit "perl" to run Perl scripts from the PrepareRelease script
297        because this is reportedly needed in Windows.
299    26. If study data was being save in a file and studying had not found a set of
300        "starts with" bytes for the pattern, the data written to the file (though
301        never used) was taken from uninitialized memory and so caused valgrind to
302        complain.
304    27. Updated RunTest.bat as provided by Sheri Pierce.
306    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
308    29. Computation of memory usage for the table of capturing group names was
309        giving an unnecessarily large value.
312  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
313  ------------------------  ------------------------

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