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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.33 xx-xxxx-201x
5  ------------  -------------------------
6    
7    1.  Added 'U' to some constants that are compared to unsigned integers, to
8        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
9        variables that are added to signed variables, to ensure the result is
10        signed and can be negated.
11    
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
14    
15    3.  Revise the creation of config.h.generic so that all boolean macros are
16        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
17        overriding via -D on the command line possible.
18    
19    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
20        to unsigned int is reported to make a quite noticeable speed difference in
21        a specific Windows environment. Testing on Linux did also appear to show
22        some benefit (and it is clearly not harmful). Also fixed the definition of
23        Xop which should be unsigned.
24    
25    5.  Related to (4), changing the definition of the intermediate variable cc
26        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
27        improvements.
28    
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
31    
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
34    
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
36    
37    
38    Version 8.32 30-November-2012
39    -----------------------------
40    
41    1.  Improved JIT compiler optimizations for first character search and single
42        character iterators.
43    
44    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
45        Patch by Daniel Richard G.
46    
47    3.  Single character iterator optimizations in the JIT compiler.
48    
49    4.  Improved JIT compiler optimizations for character ranges.
50    
51    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
52        Reported by Giuseppe D'Angelo.
53    
54    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
55        of a line, was being set incorrectly in cases where .* appeared inside
56        atomic brackets at the start of a pattern, or where there was a subsequent
57        *PRUNE or *SKIP.
58    
59    7.  Improved instruction cache flush for POWER/PowerPC.
60        Patch by Daniel Richard G.
61    
62    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
63        grep:
64    
65        (a) There is now no limit to the number of patterns to be matched.
66    
67        (b) An error is given if a pattern is too long.
68    
69        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
70            are now supported.
71    
72        (d) --exclude-from and --include-from (multiple use) have been added.
73    
74        (e) Exclusions and inclusions now apply to all files and directories, not
75            just to those obtained from scanning a directory recursively.
76    
77        (f) Multiple uses of -f and --file-list are now supported.
78    
79        (g) In a Windows environment, the default for -d has been changed from
80            "read" (the GNU grep default) to "skip", because otherwise the presence
81            of a directory in the file list provokes an error.
82    
83        (h) The documentation has been revised and clarified in places.
84    
85    9.  Improve the matching speed of capturing brackets.
86    
87    10. Changed the meaning of \X so that it now matches a Unicode extended
88        grapheme cluster.
89    
90    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
91        out POSIX threads when JIT support is configured.
92    
93    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
94    
95    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
96        structure could go wrong in environments where size_t is not the same size
97        as int.
98    
99    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
100        set.
101    
102    15. The EBCDIC support had decayed; later updates to the code had included
103        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
104        general tidy up of EBCDIC-related issues, and the documentation was also
105        not quite right. There is now a test that can be run on ASCII systems to
106        check some of the EBCDIC-related things (but is it not a full test).
107    
108    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
109        in a small tidy to the code.
110    
111    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
112    
113    18. If the --only-matching (-o) option in pcregrep is specified multiple
114        times, each one causes appropriate output. For example, -o1 -o2 outputs the
115        substrings matched by the 1st and 2nd capturing parentheses. A separating
116        string can be specified by --om-separator (default empty).
117    
118    19. Improving the first n character searches.
119    
120    20. Turn case lists for horizontal and vertical white space into macros so that
121        they are defined only once.
122    
123    21. This set of changes together give more compatible Unicode case-folding
124        behaviour for characters that have more than one other case when UCP
125        support is available.
126    
127        (a) The Unicode property table now has offsets into a new table of sets of
128            three or more characters that are case-equivalent. The MultiStage2.py
129            script that generates these tables (the pcre_ucd.c file) now scans
130            CaseFolding.txt instead of UnicodeData.txt for character case
131            information.
132    
133        (b) The code for adding characters or ranges of characters to a character
134            class has been abstracted into a generalized function that also handles
135            case-independence. In UTF-mode with UCP support, this uses the new data
136            to handle characters with more than one other case.
137    
138        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
139            whose other case is greater than 256 are now correctly matched
140            caselessly. Previously, the high codepoint matched the low one, but not
141            vice versa.
142    
143        (d) The processing of \h, \H, \v, and \ in character classes now makes use
144            of the new class addition function, using character lists defined as
145            macros alongside the case definitions of 20 above.
146    
147        (e) Caseless back references now work with characters that have more than
148            one other case.
149    
150        (f) General caseless matching of characters with more than one other case
151            is supported.
152    
153    22. Unicode character properties were updated from Unicode 6.2.0
154    
155    23. Improved CMake support under Windows. Patch by Daniel Richard G.
156    
157    24. Add support for 32-bit character strings, and UTF-32
158    
159    25. Major JIT compiler update (code refactoring and bugfixing).
160        Experimental Sparc 32 support is added.
161    
162    26. Applied a modified version of Daniel Richard G's patch to create
163        pcre.h.generic and config.h.generic by "make" instead of in the
164        PrepareRelease script.
165    
166    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
167        pcre_compile.c when checking for a zero character.
168    
169    28. Introducing a native interface for JIT. Through this interface, the compiled
170        machine code can be directly executed. The purpose of this interface is to
171        provide fast pattern matching, so several sanity checks are not performed.
172        However, feature tests are still performed. The new interface provides
173        1.4x speedup compared to the old one.
174    
175    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
176        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
177        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
178    
179    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
180        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
181        the "old" RFC 2279). Instead, it ended up passing a negative length to
182        pcre_exec().
183    
184    31. Add support for GCC's visibility feature to hide internal functions.
185    
186    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
187        "unknown -C option" after outputting 0 or 1.
188    
189    33. There is now support for generating a code coverage report for the test
190        suite in environments where gcc is the compiler and lcov is installed. This
191        is mainly for the benefit of the developers.
192    
193    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
194        unaddressable using valgrind annotations, allowing valgrind to detect
195        invalid memory accesses. This is mainly for the benefit of the developers.
196    
197    25. (*UTF) can now be used to start a pattern in any of the three libraries.
198    
199    26. Give configure error if --enable-cpp but no C++ compiler found.
200    
201    
202    Version 8.31 06-July-2012
203    -------------------------
204    
205    1.  Fixing a wrong JIT test case and some compiler warnings.
206    
207    2.  Removed a bashism from the RunTest script.
208    
209    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
210        to unsigned type, result still unsigned" that was given by an MS compiler
211        on encountering the code "-sizeof(xxx)".
212    
213    4.  Partial matching support is added to the JIT compiler.
214    
215    5.  Fixed several bugs concerned with partial matching of items that consist
216        of more than one character:
217    
218        (a) /^(..)\1/ did not partially match "aba" because checking references was
219            done on an "all or nothing" basis. This also applied to repeated
220            references.
221    
222        (b) \R did not give a hard partial match if \r was found at the end of the
223            subject.
224    
225        (c) \X did not give a hard partial match after matching one or more
226            characters at the end of the subject.
227    
228        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
229            a partial match for the string "\r".
230    
231        (e) When newline was set to CRLF, the metacharacter "." did not recognize
232            a partial match for a CR character at the end of the subject string.
233    
234    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
235        running pcretest, the text "(JIT)" added to the output whenever JIT is
236        actually used to run the match.
237    
238    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
239        or /S+[+] with a digit between 1 and 7.
240    
241    8.  OP_NOT now supports any UTF character not just single-byte ones.
242    
243    9.  (*MARK) control verb is now supported by the JIT compiler.
244    
245    10. The command "./RunTest list" lists the available tests without actually
246        running any of them. (Because I keep forgetting what they all are.)
247    
248    11. Add PCRE_INFO_MAXLOOKBEHIND.
249    
250    12. Applied a (slightly modified) user-supplied patch that improves performance
251        when the heap is used for recursion (compiled with --disable-stack-for-
252        recursion). Instead of malloc and free for each heap frame each time a
253        logical recursion happens, frames are retained on a chain and re-used where
254        possible. This sometimes gives as much as 30% improvement.
255    
256    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
257        call.
258    
259    14. As documented, (*COMMIT) is now confined to within a positive assertion.
260    
261    15. It is now possible to link pcretest with libedit as an alternative to
262        libreadline.
263    
264    16. (*COMMIT) control verb is now supported by the JIT compiler.
265    
266    17. The Unicode data tables have been updated to Unicode 6.1.0.
267    
268    18. Added --file-list option to pcregrep.
269    
270    19. Added binary file support to pcregrep, including the -a, --binary-files,
271        -I, and --text options.
272    
273    20. The madvise function is renamed for posix_madvise for QNX compatibility
274        reasons. Fixed by Giuseppe D'Angelo.
275    
276    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
277    
278    22. Changed the option for creating symbolic links for 16-bit man pages from
279        -s to -sf so that re-installing does not cause issues.
280    
281    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
282    
283    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
284        matches in certain environments (the workspace was not being correctly
285        retained). Also added to pcre_dfa_exec() a simple plausibility check on
286        some of the workspace data at the beginning of a restart.
287    
288    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
289        was not doing so when it should - probably a typo introduced by SVN 528
290        (change 8.10/14).
291    
292    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
293        \w+ when the character tables indicated that \x{c4} was a word character.
294        There were several related cases, all because the tests for doing a table
295        lookup were testing for characters less than 127 instead of 255.
296    
297    27. If a pattern contains capturing parentheses that are not used in a match,
298        their slots in the ovector are set to -1. For those that are higher than
299        any matched groups, this happens at the end of processing. In the case when
300        there were back references that the ovector was too small to contain
301        (causing temporary malloc'd memory to be used during matching), and the
302        highest capturing number was not used, memory off the end of the ovector
303        was incorrectly being set to -1. (It was using the size of the temporary
304        memory instead of the true size.)
305    
306    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
307        ovector size, it uses memory at the end of the block that it has got.
308    
309    29. Check for an overlong MARK name and give an error at compile time. The
310        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
311    
312    30. JIT compiler update.
313    
314    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
315        Rill for the patch.
316    
317    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
318    
319    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
320    
321    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
322        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
323        was enabled.
324    
325    35. Improve JIT code generation for greedy plus quantifier.
326    
327    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
328        1 to "aa" instead of to an empty string. The bug affected repeated groups
329        that could potentially match an empty string.
330    
331    37. Optimizing single character iterators in JIT.
332    
333    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
334        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
335        codepoints that are too big for the mode are faulted, and in a UTF mode,
336        disallowed codepoints are also faulted.
337    
338    39. If PCRE was compiled with UTF support, in three places in the DFA
339        matcher there was code that should only have been obeyed in UTF mode, but
340        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
341        processing when bytes with values greater than 127 were present. In 16-bit
342        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
343        both cases the values are those that cannot be the first data item in a UTF
344        character. The three items that might have provoked this were recursions,
345        possessively repeated groups, and atomic groups.
346    
347    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
348        and pcregrep, because some OS require shared objects to be explicitly
349        passed to ld, causing the link step to fail if they are not.
350    
351    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
352        mode, patterns that started with \h* or \R* might be incorrectly matched.
353    
354    
355    Version 8.30 04-February-2012
356    -----------------------------
357    
358    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
359        name is defined in ctype.h.
360    
361    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
362        only in quite long subpatterns.
363    
364    3.  Removed the function pcre_info(), which has been obsolete and deprecated
365        since it was replaced by pcre_fullinfo() in February 2000.
366    
367    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
368        match a (*MARK), and the match failed at the start of the subject, a
369        reference to memory before the start of the subject could occur. This bug
370        was introduced by fix 17 of release 8.21.
371    
372    5.  A reference to an unset group with zero minimum repetition was giving
373        totally wrong answers (in non-JavaScript-compatibility mode). For example,
374        /(another)?(\1?)test/ matched against "hello world test". This bug was
375        introduced in release 8.13.
376    
377    6.  Add support for 16-bit character strings (a large amount of work involving
378        many changes and refactorings).
379    
380    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
381        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
382        from a file.
383    
384    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
385        rounding is not applied in this particular case).
386    
387    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
388        if they appear, or are escaped, in patterns.
389    
390    10. Get rid of a number of -Wunused-but-set-variable warnings.
391    
392    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
393        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
394        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
395        also returns the mark "x". This bug applied to capturing parentheses,
396        non-capturing parentheses, and atomic parentheses. It also applied to some
397        assertions.
398    
399    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
400        information out of configure.ac instead of relying on pcre.h.generic, which
401        is not stored in the repository.
402    
403    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
404        -lreadline.
405    
406    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
407    
408    15. Applied Graycode's patch to put the top-level frame on the stack rather
409        than the heap when not using the stack for recursion. This gives a
410        performance improvement in many cases when recursion is not deep.
411    
412    16. Experimental code added to "pcretest -C" to output the stack frame size.
413    
414    
415    Version 8.21 12-Dec-2011
416    ------------------------
417    
418  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
419    
420    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
421        are added as well.
422    
423    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
424        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
425        calling _pcre_jit_exec. Some extra comments are added.
426    
427    4.  (*MARK) settings inside atomic groups that do not contain any capturing
428        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
429        was introduced by change 18 for 8.20.
430    
431    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
432        ECMA-262 standard.
433    
434    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
435        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
436        This bug was probably introduced by change 9 of 8.13.
437    
438    7.  While fixing 6 above, I noticed that a number of other items were being
439        incorrectly rejected as "not fixed length". This arose partly because newer
440        opcodes had not been added to the fixed-length checking code. I have (a)
441        corrected the bug and added tests for these items, and (b) arranged for an
442        error to occur if an unknown opcode is encountered while checking for fixed
443        length instead of just assuming "not fixed length". The items that were
444        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
445        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
446        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
447    
448    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
449        being incorrectly compiled and would have given unpredicatble results.
450    
451    9.  A possessively repeated subpattern with minimum repeat count greater than
452        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
453        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
454        the first (A) could occur when it should not.
455    
456    10. Add a cast and remove a redundant test from the code.
457    
458    11. JIT should use pcre_malloc/pcre_free for allocation.
459    
460    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
461        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
462        is anything other than /usr, -L is still shown).
463    
464    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
465    
466    14. Perl does not support \N without a following name in a [] class; PCRE now
467        also gives an error.
468    
469    15. If a forward reference was repeated with an upper limit of around 2000,
470        it caused the error "internal error: overran compiling workspace". The
471        maximum number of forward references (including repeats) was limited by the
472        internal workspace, and dependent on the LINK_SIZE. The code has been
473        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
474        the default depends on LINK_SIZE. There is a new upper limit (for safety)
475        of around 200,000 forward references. While doing this, I also speeded up
476        the filling in of repeated forward references.
477    
478    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
479        incorrectly expecting the subject to contain another "a" after the start.
480    
481    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
482        in the match, the SKIP should be ignored. This was not happening; instead
483        the SKIP was being treated as NOMATCH. For patterns such as
484        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
485        tested.
486    
487    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
488        now much more compatible with Perl, in particular in cases where the result
489        is a non-match for a non-anchored pattern. For example, if
490        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
491        "m", where previously it did not return a name. A side effect of this
492        change is that for partial matches, the last encountered mark name is
493        returned, as for non matches. A number of tests that were previously not
494        Perl-compatible have been moved into the Perl-compatible test files. The
495        refactoring has had the pleasing side effect of removing one argument from
496        the match() function, thus reducing its stack requirements.
497    
498    19. If the /S+ option was used in pcretest to study a pattern using JIT,
499        subsequent uses of /S (without +) incorrectly behaved like /S+.
500    
501    21. Retrieve executable code size support for the JIT compiler and fixing
502        some warnings.
503    
504    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
505        not work when the shorter character appeared right at the end of the
506        subject string.
507    
508    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
509        systems.
510    
511    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
512        output it when the /M option is used in pcretest.
513    
514    25. The CheckMan script was not being included in the distribution. Also, added
515        an explicit "perl" to run Perl scripts from the PrepareRelease script
516        because this is reportedly needed in Windows.
517    
518    26. If study data was being save in a file and studying had not found a set of
519        "starts with" bytes for the pattern, the data written to the file (though
520        never used) was taken from uninitialized memory and so caused valgrind to
521        complain.
522    
523    27. Updated RunTest.bat as provided by Sheri Pierce.
524    
525    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
526    
527    29. Computation of memory usage for the table of capturing group names was
528        giving an unnecessarily large value.
529    
530    
531  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
532  ------------------------  ------------------------

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