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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 1115 by chpe, Tue Oct 16 15:57:19 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  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    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
66        set.
67    
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).
73    
74    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
75        in a small tidy to the code.
76    
77    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
78    
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).
83    
84    19. Improving the first n character searches.
85    
86    20. Turn case lists for horizontal and vertical white space into macros so that
87        they are defined only once.
88    
89    21. This set of changes together give more compatible Unicode case-folding
90        behaviour for characters that have more than one other case when UCP
91        support is available.
92    
93        (a) The Unicode property table now has offsets into a new table of sets of
94            three or more characters that are case-equivalent. The MultiStage2.py
95            script that generates these tables (the pcre_ucd.c file) now scans
96            CaseFolding.txt instead of UnicodeData.txt for character case
97            information.
98    
99        (b) The code for adding characters or ranges of characters to a character
100            class has been abstracted into a generalized function that also handles
101            case-independence. In UTF-mode with UCP support, this uses the new data
102            to handle characters with more than one other case.
103    
104        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
105            whose other case is greater than 256 are now correctly matched
106            caselessly. Previously, the high codepoint matched the low one, but not
107            vice versa.
108    
109        (d) The processing of \h, \H, \v, and \ in character classes now makes use
110            of the new class addition function, using character lists defined as
111            macros alongside the case definitions of 20 above.
112    
113        (e) Caseless back references now work with characters that have more than
114            one other case.
115    
116        (f) General caseless matching of characters with more than one other case
117            is supported.
118    
119    22. Unicode character properties were updated from Unicode 6.2.0
120    
121    23. Improved CMake support under Windows. Patch by Daniel Richard G.
122    
123    24. Add support for 32-bit character strings, and UTF-32
124    
125    
126    Version 8.31 06-July-2012
127    -------------------------
128    
129    1.  Fixing a wrong JIT test case and some compiler warnings.
130    
131    2.  Removed a bashism from the RunTest script.
132    
133    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
134        to unsigned type, result still unsigned" that was given by an MS compiler
135        on encountering the code "-sizeof(xxx)".
136    
137    4.  Partial matching support is added to the JIT compiler.
138    
139    5.  Fixed several bugs concerned with partial matching of items that consist
140        of more than one character:
141    
142        (a) /^(..)\1/ did not partially match "aba" because checking references was
143            done on an "all or nothing" basis. This also applied to repeated
144            references.
145    
146        (b) \R did not give a hard partial match if \r was found at the end of the
147            subject.
148    
149        (c) \X did not give a hard partial match after matching one or more
150            characters at the end of the subject.
151    
152        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
153            a partial match for the string "\r".
154    
155        (e) When newline was set to CRLF, the metacharacter "." did not recognize
156            a partial match for a CR character at the end of the subject string.
157    
158    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
159        running pcretest, the text "(JIT)" added to the output whenever JIT is
160        actually used to run the match.
161    
162    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
163        or /S+[+] with a digit between 1 and 7.
164    
165    8.  OP_NOT now supports any UTF character not just single-byte ones.
166    
167    9.  (*MARK) control verb is now supported by the JIT compiler.
168    
169    10. The command "./RunTest list" lists the available tests without actually
170        running any of them. (Because I keep forgetting what they all are.)
171    
172    11. Add PCRE_INFO_MAXLOOKBEHIND.
173    
174    12. Applied a (slightly modified) user-supplied patch that improves performance
175        when the heap is used for recursion (compiled with --disable-stack-for-
176        recursion). Instead of malloc and free for each heap frame each time a
177        logical recursion happens, frames are retained on a chain and re-used where
178        possible. This sometimes gives as much as 30% improvement.
179    
180    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
181        call.
182    
183    14. As documented, (*COMMIT) is now confined to within a positive assertion.
184    
185    15. It is now possible to link pcretest with libedit as an alternative to
186        libreadline.
187    
188    16. (*COMMIT) control verb is now supported by the JIT compiler.
189    
190    17. The Unicode data tables have been updated to Unicode 6.1.0.
191    
192    18. Added --file-list option to pcregrep.
193    
194    19. Added binary file support to pcregrep, including the -a, --binary-files,
195        -I, and --text options.
196    
197    20. The madvise function is renamed for posix_madvise for QNX compatibility
198        reasons. Fixed by Giuseppe D'Angelo.
199    
200    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
201    
202    22. Changed the option for creating symbolic links for 16-bit man pages from
203        -s to -sf so that re-installing does not cause issues.
204    
205    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
206    
207    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
208        matches in certain environments (the workspace was not being correctly
209        retained). Also added to pcre_dfa_exec() a simple plausibility check on
210        some of the workspace data at the beginning of a restart.
211    
212    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
213        was not doing so when it should - probably a typo introduced by SVN 528
214        (change 8.10/14).
215    
216    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
217        \w+ when the character tables indicated that \x{c4} was a word character.
218        There were several related cases, all because the tests for doing a table
219        lookup were testing for characters less than 127 instead of 255.
220    
221    27. If a pattern contains capturing parentheses that are not used in a match,
222        their slots in the ovector are set to -1. For those that are higher than
223        any matched groups, this happens at the end of processing. In the case when
224        there were back references that the ovector was too small to contain
225        (causing temporary malloc'd memory to be used during matching), and the
226        highest capturing number was not used, memory off the end of the ovector
227        was incorrectly being set to -1. (It was using the size of the temporary
228        memory instead of the true size.)
229    
230    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
231        ovector size, it uses memory at the end of the block that it has got.
232    
233    29. Check for an overlong MARK name and give an error at compile time. The
234        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
235    
236    30. JIT compiler update.
237    
238    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
239        Rill for the patch.
240    
241    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
242    
243    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
244    
245    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
246        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
247        was enabled.
248    
249    35. Improve JIT code generation for greedy plus quantifier.
250    
251    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
252        1 to "aa" instead of to an empty string. The bug affected repeated groups
253        that could potentially match an empty string.
254    
255    37. Optimizing single character iterators in JIT.
256    
257    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
258        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
259        codepoints that are too big for the mode are faulted, and in a UTF mode,
260        disallowed codepoints are also faulted.
261    
262    39. If PCRE was compiled with UTF support, in three places in the DFA
263        matcher there was code that should only have been obeyed in UTF mode, but
264        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
265        processing when bytes with values greater than 127 were present. In 16-bit
266        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
267        both cases the values are those that cannot be the first data item in a UTF
268        character. The three items that might have provoked this were recursions,
269        possessively repeated groups, and atomic groups.
270    
271    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
272        and pcregrep, because some OS require shared objects to be explicitly
273        passed to ld, causing the link step to fail if they are not.
274    
275    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
276        mode, patterns that started with \h* or \R* might be incorrectly matched.
277    
278    
279    Version 8.30 04-February-2012
280    -----------------------------
281    
282    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
283        name is defined in ctype.h.
284    
285    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
286        only in quite long subpatterns.
287    
288    3.  Removed the function pcre_info(), which has been obsolete and deprecated
289        since it was replaced by pcre_fullinfo() in February 2000.
290    
291    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
292        match a (*MARK), and the match failed at the start of the subject, a
293        reference to memory before the start of the subject could occur. This bug
294        was introduced by fix 17 of release 8.21.
295    
296    5.  A reference to an unset group with zero minimum repetition was giving
297        totally wrong answers (in non-JavaScript-compatibility mode). For example,
298        /(another)?(\1?)test/ matched against "hello world test". This bug was
299        introduced in release 8.13.
300    
301    6.  Add support for 16-bit character strings (a large amount of work involving
302        many changes and refactorings).
303    
304    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
305        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
306        from a file.
307    
308    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
309        rounding is not applied in this particular case).
310    
311    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
312        if they appear, or are escaped, in patterns.
313    
314    10. Get rid of a number of -Wunused-but-set-variable warnings.
315    
316    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
317        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
318        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
319        also returns the mark "x". This bug applied to capturing parentheses,
320        non-capturing parentheses, and atomic parentheses. It also applied to some
321        assertions.
322    
323    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
324        information out of configure.ac instead of relying on pcre.h.generic, which
325        is not stored in the repository.
326    
327    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
328        -lreadline.
329    
330    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
331    
332    15. Applied Graycode's patch to put the top-level frame on the stack rather
333        than the heap when not using the stack for recursion. This gives a
334        performance improvement in many cases when recursion is not deep.
335    
336    16. Experimental code added to "pcretest -C" to output the stack frame size.
337    
338    
339    Version 8.21 12-Dec-2011
340    ------------------------
341    
342  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
343    
344    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
345        are added as well.
346    
347    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
348        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
349        calling _pcre_jit_exec. Some extra comments are added.
350    
351    4.  (*MARK) settings inside atomic groups that do not contain any capturing
352        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
353        was introduced by change 18 for 8.20.
354    
355    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
356        ECMA-262 standard.
357    
358    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
359        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
360        This bug was probably introduced by change 9 of 8.13.
361    
362    7.  While fixing 6 above, I noticed that a number of other items were being
363        incorrectly rejected as "not fixed length". This arose partly because newer
364        opcodes had not been added to the fixed-length checking code. I have (a)
365        corrected the bug and added tests for these items, and (b) arranged for an
366        error to occur if an unknown opcode is encountered while checking for fixed
367        length instead of just assuming "not fixed length". The items that were
368        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
369        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
370        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
371    
372    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
373        being incorrectly compiled and would have given unpredicatble results.
374    
375    9.  A possessively repeated subpattern with minimum repeat count greater than
376        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
377        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
378        the first (A) could occur when it should not.
379    
380    10. Add a cast and remove a redundant test from the code.
381    
382    11. JIT should use pcre_malloc/pcre_free for allocation.
383    
384    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
385        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
386        is anything other than /usr, -L is still shown).
387    
388    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
389    
390    14. Perl does not support \N without a following name in a [] class; PCRE now
391        also gives an error.
392    
393    15. If a forward reference was repeated with an upper limit of around 2000,
394        it caused the error "internal error: overran compiling workspace". The
395        maximum number of forward references (including repeats) was limited by the
396        internal workspace, and dependent on the LINK_SIZE. The code has been
397        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
398        the default depends on LINK_SIZE. There is a new upper limit (for safety)
399        of around 200,000 forward references. While doing this, I also speeded up
400        the filling in of repeated forward references.
401    
402    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
403        incorrectly expecting the subject to contain another "a" after the start.
404    
405    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
406        in the match, the SKIP should be ignored. This was not happening; instead
407        the SKIP was being treated as NOMATCH. For patterns such as
408        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
409        tested.
410    
411    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
412        now much more compatible with Perl, in particular in cases where the result
413        is a non-match for a non-anchored pattern. For example, if
414        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
415        "m", where previously it did not return a name. A side effect of this
416        change is that for partial matches, the last encountered mark name is
417        returned, as for non matches. A number of tests that were previously not
418        Perl-compatible have been moved into the Perl-compatible test files. The
419        refactoring has had the pleasing side effect of removing one argument from
420        the match() function, thus reducing its stack requirements.
421    
422    19. If the /S+ option was used in pcretest to study a pattern using JIT,
423        subsequent uses of /S (without +) incorrectly behaved like /S+.
424    
425    21. Retrieve executable code size support for the JIT compiler and fixing
426        some warnings.
427    
428    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
429        not work when the shorter character appeared right at the end of the
430        subject string.
431    
432    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
433        systems.
434    
435    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
436        output it when the /M option is used in pcretest.
437    
438    25. The CheckMan script was not being included in the distribution. Also, added
439        an explicit "perl" to run Perl scripts from the PrepareRelease script
440        because this is reportedly needed in Windows.
441    
442    26. If study data was being save in a file and studying had not found a set of
443        "starts with" bytes for the pattern, the data written to the file (though
444        never used) was taken from uninitialized memory and so caused valgrind to
445        complain.
446    
447    27. Updated RunTest.bat as provided by Sheri Pierce.
448    
449    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
450    
451    29. Computation of memory usage for the table of capturing group names was
452        giving an unnecessarily large value.
453    
454    
455  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
456  ------------------------  ------------------------

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