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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  Version 8.32
5  ------------  ------------
7    1.  Improved JIT compiler optimizations for first character search and single
8        character iterators.
10    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
11        Patch by Daniel Richard G.
13    3.  Single character iterator optimizations in the JIT compiler.
15    4.  Improved JIT compiler optimizations for character ranges.
17    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
18        Reported by Giuseppe D'Angelo.
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.
25    7.  Improved instruction cache flush for POWER/PowerPC.
26        Patch by Daniel Richard G.
28    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
29        grep:
31        (a) There is now no limit to the number of patterns to be matched.
33        (b) An error is given if a pattern is too long.
35        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
36            are now supported.
38        (d) --exclude-from and --include-from (multiple use) have been added.
40        (e) Exclusions and inclusions now apply to all files and directories, not
41            just to those obtained from scanning a directory recursively.
43        (f) Multiple uses of -f and --file-list are now supported.
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.
49        (h) The documentation has been revised and clarified in places.
51    9.  Improve the matching speed of capturing brackets.
53    10. Changed the meaning of \X so that it now matches a Unicode extended
54        grapheme cluster.
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.
59    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
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.
65    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
68    15. The EBCDIC support had decayed; later updates to the code had included
69        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
70        general tidy up of EBCDIC-related issues, and the documentation was also
71        not quite right. There is now a test that can be run on ASCII systems to
72        check some of the EBCDIC-related things (but is it not a full test).
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
79    18. If the --only-matching (-o) option in pcregrep is specified multiple
80        times, each one causes appropriate output. For example, -o1 -o2 outputs the
81        substrings matched by the 1st and 2nd capturing parentheses. A separating
82        string can be specified by --om-separator (default empty).
84    19. Improving the first n character searches.
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
90    Version 8.31 06-July-2012
91    -------------------------
93    1.  Fixing a wrong JIT test case and some compiler warnings.
95    2.  Removed a bashism from the RunTest script.
97    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
98        to unsigned type, result still unsigned" that was given by an MS compiler
99        on encountering the code "-sizeof(xxx)".
101    4.  Partial matching support is added to the JIT compiler.
103    5.  Fixed several bugs concerned with partial matching of items that consist
104        of more than one character:
106        (a) /^(..)\1/ did not partially match "aba" because checking references was
107            done on an "all or nothing" basis. This also applied to repeated
108            references.
110        (b) \R did not give a hard partial match if \r was found at the end of the
111            subject.
113        (c) \X did not give a hard partial match after matching one or more
114            characters at the end of the subject.
116        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
117            a partial match for the string "\r".
119        (e) When newline was set to CRLF, the metacharacter "." did not recognize
120            a partial match for a CR character at the end of the subject string.
122    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
123        running pcretest, the text "(JIT)" added to the output whenever JIT is
124        actually used to run the match.
126    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
127        or /S+[+] with a digit between 1 and 7.
129    8.  OP_NOT now supports any UTF character not just single-byte ones.
131    9.  (*MARK) control verb is now supported by the JIT compiler.
133    10. The command "./RunTest list" lists the available tests without actually
134        running any of them. (Because I keep forgetting what they all are.)
138    12. Applied a (slightly modified) user-supplied patch that improves performance
139        when the heap is used for recursion (compiled with --disable-stack-for-
140        recursion). Instead of malloc and free for each heap frame each time a
141        logical recursion happens, frames are retained on a chain and re-used where
142        possible. This sometimes gives as much as 30% improvement.
144    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
145        call.
147    14. As documented, (*COMMIT) is now confined to within a positive assertion.
149    15. It is now possible to link pcretest with libedit as an alternative to
150        libreadline.
152    16. (*COMMIT) control verb is now supported by the JIT compiler.
154    17. The Unicode data tables have been updated to Unicode 6.1.0.
156    18. Added --file-list option to pcregrep.
158    19. Added binary file support to pcregrep, including the -a, --binary-files,
159        -I, and --text options.
161    20. The madvise function is renamed for posix_madvise for QNX compatibility
162        reasons. Fixed by Giuseppe D'Angelo.
164    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
166    22. Changed the option for creating symbolic links for 16-bit man pages from
167        -s to -sf so that re-installing does not cause issues.
169    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
171    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
172        matches in certain environments (the workspace was not being correctly
173        retained). Also added to pcre_dfa_exec() a simple plausibility check on
174        some of the workspace data at the beginning of a restart.
176    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
177        was not doing so when it should - probably a typo introduced by SVN 528
178        (change 8.10/14).
180    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
181        \w+ when the character tables indicated that \x{c4} was a word character.
182        There were several related cases, all because the tests for doing a table
183        lookup were testing for characters less than 127 instead of 255.
185    27. If a pattern contains capturing parentheses that are not used in a match,
186        their slots in the ovector are set to -1. For those that are higher than
187        any matched groups, this happens at the end of processing. In the case when
188        there were back references that the ovector was too small to contain
189        (causing temporary malloc'd memory to be used during matching), and the
190        highest capturing number was not used, memory off the end of the ovector
191        was incorrectly being set to -1. (It was using the size of the temporary
192        memory instead of the true size.)
194    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
195        ovector size, it uses memory at the end of the block that it has got.
197    29. Check for an overlong MARK name and give an error at compile time. The
198        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
200    30. JIT compiler update.
202    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
203        Rill for the patch.
205    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
207    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
209    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
210        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
211        was enabled.
213    35. Improve JIT code generation for greedy plus quantifier.
215    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
216        1 to "aa" instead of to an empty string. The bug affected repeated groups
217        that could potentially match an empty string.
219    37. Optimizing single character iterators in JIT.
221    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
222        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
223        codepoints that are too big for the mode are faulted, and in a UTF mode,
224        disallowed codepoints are also faulted.
226    39. If PCRE was compiled with UTF support, in three places in the DFA
227        matcher there was code that should only have been obeyed in UTF mode, but
228        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
229        processing when bytes with values greater than 127 were present. In 16-bit
230        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
231        both cases the values are those that cannot be the first data item in a UTF
232        character. The three items that might have provoked this were recursions,
233        possessively repeated groups, and atomic groups.
235    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
236        and pcregrep, because some OS require shared objects to be explicitly
237        passed to ld, causing the link step to fail if they are not.
239    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
240        mode, patterns that started with \h* or \R* might be incorrectly matched.
243    Version 8.30 04-February-2012
244    -----------------------------
246    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
247        name is defined in ctype.h.
249    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
250        only in quite long subpatterns.
252    3.  Removed the function pcre_info(), which has been obsolete and deprecated
253        since it was replaced by pcre_fullinfo() in February 2000.
255    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
256        match a (*MARK), and the match failed at the start of the subject, a
257        reference to memory before the start of the subject could occur. This bug
258        was introduced by fix 17 of release 8.21.
260    5.  A reference to an unset group with zero minimum repetition was giving
261        totally wrong answers (in non-JavaScript-compatibility mode). For example,
262        /(another)?(\1?)test/ matched against "hello world test". This bug was
263        introduced in release 8.13.
265    6.  Add support for 16-bit character strings (a large amount of work involving
266        many changes and refactorings).
268    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
269        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
270        from a file.
272    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
273        rounding is not applied in this particular case).
275    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
276        if they appear, or are escaped, in patterns.
278    10. Get rid of a number of -Wunused-but-set-variable warnings.
280    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
281        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
282        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
283        also returns the mark "x". This bug applied to capturing parentheses,
284        non-capturing parentheses, and atomic parentheses. It also applied to some
285        assertions.
287    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
288        information out of configure.ac instead of relying on pcre.h.generic, which
289        is not stored in the repository.
291    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
292        -lreadline.
294    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
296    15. Applied Graycode's patch to put the top-level frame on the stack rather
297        than the heap when not using the stack for recursion. This gives a
298        performance improvement in many cases when recursion is not deep.
300    16. Experimental code added to "pcretest -C" to output the stack frame size.
303    Version 8.21 12-Dec-2011
304    ------------------------
306  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
308    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
309        are added as well.
311    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
312        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
313        calling _pcre_jit_exec. Some extra comments are added.
315    4.  (*MARK) settings inside atomic groups that do not contain any capturing
316        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
317        was introduced by change 18 for 8.20.
319    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
320        ECMA-262 standard.
322    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
323        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
324        This bug was probably introduced by change 9 of 8.13.
326    7.  While fixing 6 above, I noticed that a number of other items were being
327        incorrectly rejected as "not fixed length". This arose partly because newer
328        opcodes had not been added to the fixed-length checking code. I have (a)
329        corrected the bug and added tests for these items, and (b) arranged for an
330        error to occur if an unknown opcode is encountered while checking for fixed
331        length instead of just assuming "not fixed length". The items that were
332        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
333        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
334        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
336    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
337        being incorrectly compiled and would have given unpredicatble results.
339    9.  A possessively repeated subpattern with minimum repeat count greater than
340        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
341        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
342        the first (A) could occur when it should not.
344    10. Add a cast and remove a redundant test from the code.
346    11. JIT should use pcre_malloc/pcre_free for allocation.
348    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
349        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
350        is anything other than /usr, -L is still shown).
352    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
354    14. Perl does not support \N without a following name in a [] class; PCRE now
355        also gives an error.
357    15. If a forward reference was repeated with an upper limit of around 2000,
358        it caused the error "internal error: overran compiling workspace". The
359        maximum number of forward references (including repeats) was limited by the
360        internal workspace, and dependent on the LINK_SIZE. The code has been
361        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
362        the default depends on LINK_SIZE. There is a new upper limit (for safety)
363        of around 200,000 forward references. While doing this, I also speeded up
364        the filling in of repeated forward references.
366    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
367        incorrectly expecting the subject to contain another "a" after the start.
369    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
370        in the match, the SKIP should be ignored. This was not happening; instead
371        the SKIP was being treated as NOMATCH. For patterns such as
372        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
373        tested.
375    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
376        now much more compatible with Perl, in particular in cases where the result
377        is a non-match for a non-anchored pattern. For example, if
378        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
379        "m", where previously it did not return a name. A side effect of this
380        change is that for partial matches, the last encountered mark name is
381        returned, as for non matches. A number of tests that were previously not
382        Perl-compatible have been moved into the Perl-compatible test files. The
383        refactoring has had the pleasing side effect of removing one argument from
384        the match() function, thus reducing its stack requirements.
386    19. If the /S+ option was used in pcretest to study a pattern using JIT,
387        subsequent uses of /S (without +) incorrectly behaved like /S+.
389    21. Retrieve executable code size support for the JIT compiler and fixing
390        some warnings.
392    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
393        not work when the shorter character appeared right at the end of the
394        subject string.
396    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
397        systems.
399    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
400        output it when the /M option is used in pcretest.
402    25. The CheckMan script was not being included in the distribution. Also, added
403        an explicit "perl" to run Perl scripts from the PrepareRelease script
404        because this is reportedly needed in Windows.
406    26. If study data was being save in a file and studying had not found a set of
407        "starts with" bytes for the pattern, the data written to the file (though
408        never used) was taken from uninitialized memory and so caused valgrind to
409        complain.
411    27. Updated RunTest.bat as provided by Sheri Pierce.
413    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
415    29. Computation of memory usage for the table of capturing group names was
416        giving an unnecessarily large value.
419  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
420  ------------------------  ------------------------

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