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