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revision 753 by ph10, Sat Nov 19 17:03:35 2011 UTC revision 1187 by zherczeg, Mon Oct 29 11:30:45 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    25. Major JIT compiler update (code refactoring and bugfixing).
126        Experimental Sparc 32 support is added.
127    
128    26. Applied a modified version of Daniel Richard G's patch to create
129        pcre.h.generic and config.h.generic by "make" instead of in the
130        PrepareRelease script.
131    
132    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
133        pcre_compile.c when checking for a zero character.
134    
135    28. Introducing a native interface for JIT. Through this interface, the compiled
136        machine code can be directly executed. The purpose of this interface is to
137        provide fast pattern matching, so several sanity checks are not performed.
138        However, feature tests are still performed. The new interface provides
139        1.4x speedup compared to the old one.
140    
141    
142    Version 8.31 06-July-2012
143    -------------------------
144    
145    1.  Fixing a wrong JIT test case and some compiler warnings.
146    
147    2.  Removed a bashism from the RunTest script.
148    
149    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
150        to unsigned type, result still unsigned" that was given by an MS compiler
151        on encountering the code "-sizeof(xxx)".
152    
153    4.  Partial matching support is added to the JIT compiler.
154    
155    5.  Fixed several bugs concerned with partial matching of items that consist
156        of more than one character:
157    
158        (a) /^(..)\1/ did not partially match "aba" because checking references was
159            done on an "all or nothing" basis. This also applied to repeated
160            references.
161    
162        (b) \R did not give a hard partial match if \r was found at the end of the
163            subject.
164    
165        (c) \X did not give a hard partial match after matching one or more
166            characters at the end of the subject.
167    
168        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
169            a partial match for the string "\r".
170    
171        (e) When newline was set to CRLF, the metacharacter "." did not recognize
172            a partial match for a CR character at the end of the subject string.
173    
174    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
175        running pcretest, the text "(JIT)" added to the output whenever JIT is
176        actually used to run the match.
177    
178    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
179        or /S+[+] with a digit between 1 and 7.
180    
181    8.  OP_NOT now supports any UTF character not just single-byte ones.
182    
183    9.  (*MARK) control verb is now supported by the JIT compiler.
184    
185    10. The command "./RunTest list" lists the available tests without actually
186        running any of them. (Because I keep forgetting what they all are.)
187    
188    11. Add PCRE_INFO_MAXLOOKBEHIND.
189    
190    12. Applied a (slightly modified) user-supplied patch that improves performance
191        when the heap is used for recursion (compiled with --disable-stack-for-
192        recursion). Instead of malloc and free for each heap frame each time a
193        logical recursion happens, frames are retained on a chain and re-used where
194        possible. This sometimes gives as much as 30% improvement.
195    
196    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
197        call.
198    
199    14. As documented, (*COMMIT) is now confined to within a positive assertion.
200    
201    15. It is now possible to link pcretest with libedit as an alternative to
202        libreadline.
203    
204    16. (*COMMIT) control verb is now supported by the JIT compiler.
205    
206    17. The Unicode data tables have been updated to Unicode 6.1.0.
207    
208    18. Added --file-list option to pcregrep.
209    
210    19. Added binary file support to pcregrep, including the -a, --binary-files,
211        -I, and --text options.
212    
213    20. The madvise function is renamed for posix_madvise for QNX compatibility
214        reasons. Fixed by Giuseppe D'Angelo.
215    
216    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
217    
218    22. Changed the option for creating symbolic links for 16-bit man pages from
219        -s to -sf so that re-installing does not cause issues.
220    
221    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
222    
223    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
224        matches in certain environments (the workspace was not being correctly
225        retained). Also added to pcre_dfa_exec() a simple plausibility check on
226        some of the workspace data at the beginning of a restart.
227    
228    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
229        was not doing so when it should - probably a typo introduced by SVN 528
230        (change 8.10/14).
231    
232    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
233        \w+ when the character tables indicated that \x{c4} was a word character.
234        There were several related cases, all because the tests for doing a table
235        lookup were testing for characters less than 127 instead of 255.
236    
237    27. If a pattern contains capturing parentheses that are not used in a match,
238        their slots in the ovector are set to -1. For those that are higher than
239        any matched groups, this happens at the end of processing. In the case when
240        there were back references that the ovector was too small to contain
241        (causing temporary malloc'd memory to be used during matching), and the
242        highest capturing number was not used, memory off the end of the ovector
243        was incorrectly being set to -1. (It was using the size of the temporary
244        memory instead of the true size.)
245    
246    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
247        ovector size, it uses memory at the end of the block that it has got.
248    
249    29. Check for an overlong MARK name and give an error at compile time. The
250        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
251    
252    30. JIT compiler update.
253    
254    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
255        Rill for the patch.
256    
257    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
258    
259    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
260    
261    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
262        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
263        was enabled.
264    
265    35. Improve JIT code generation for greedy plus quantifier.
266    
267    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
268        1 to "aa" instead of to an empty string. The bug affected repeated groups
269        that could potentially match an empty string.
270    
271    37. Optimizing single character iterators in JIT.
272    
273    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
274        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
275        codepoints that are too big for the mode are faulted, and in a UTF mode,
276        disallowed codepoints are also faulted.
277    
278    39. If PCRE was compiled with UTF support, in three places in the DFA
279        matcher there was code that should only have been obeyed in UTF mode, but
280        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
281        processing when bytes with values greater than 127 were present. In 16-bit
282        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
283        both cases the values are those that cannot be the first data item in a UTF
284        character. The three items that might have provoked this were recursions,
285        possessively repeated groups, and atomic groups.
286    
287    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
288        and pcregrep, because some OS require shared objects to be explicitly
289        passed to ld, causing the link step to fail if they are not.
290    
291    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
292        mode, patterns that started with \h* or \R* might be incorrectly matched.
293    
294    
295    Version 8.30 04-February-2012
296    -----------------------------
297    
298    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
299        name is defined in ctype.h.
300    
301    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
302        only in quite long subpatterns.
303    
304    3.  Removed the function pcre_info(), which has been obsolete and deprecated
305        since it was replaced by pcre_fullinfo() in February 2000.
306    
307    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
308        match a (*MARK), and the match failed at the start of the subject, a
309        reference to memory before the start of the subject could occur. This bug
310        was introduced by fix 17 of release 8.21.
311    
312    5.  A reference to an unset group with zero minimum repetition was giving
313        totally wrong answers (in non-JavaScript-compatibility mode). For example,
314        /(another)?(\1?)test/ matched against "hello world test". This bug was
315        introduced in release 8.13.
316    
317    6.  Add support for 16-bit character strings (a large amount of work involving
318        many changes and refactorings).
319    
320    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
321        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
322        from a file.
323    
324    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
325        rounding is not applied in this particular case).
326    
327    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
328        if they appear, or are escaped, in patterns.
329    
330    10. Get rid of a number of -Wunused-but-set-variable warnings.
331    
332    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
333        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
334        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
335        also returns the mark "x". This bug applied to capturing parentheses,
336        non-capturing parentheses, and atomic parentheses. It also applied to some
337        assertions.
338    
339    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
340        information out of configure.ac instead of relying on pcre.h.generic, which
341        is not stored in the repository.
342    
343    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
344        -lreadline.
345    
346    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
347    
348    15. Applied Graycode's patch to put the top-level frame on the stack rather
349        than the heap when not using the stack for recursion. This gives a
350        performance improvement in many cases when recursion is not deep.
351    
352    16. Experimental code added to "pcretest -C" to output the stack frame size.
353    
354    
355    Version 8.21 12-Dec-2011
356    ------------------------
357    
358  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
359    
360  2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases  2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
# Line 13  Version 8.21 Line 364  Version 8.21
364      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
365      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
366    
367  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
368      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
369      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
370    
# Line 22  Version 8.21 Line 373  Version 8.21
373    
374  6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were  6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
375      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
376      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
377    
378  7.  While fixing 6 above, I noticed that a number of other items were being  7.  While fixing 6 above, I noticed that a number of other items were being
379      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
380      opcodes had not been added to the fixed-length checking code. I have (a)      opcodes had not been added to the fixed-length checking code. I have (a)
381      corrected the bug and added tests for these items, and (b) arranged for an      corrected the bug and added tests for these items, and (b) arranged for an
382      error to occur if an unknown opcode is encountered while checking for fixed      error to occur if an unknown opcode is encountered while checking for fixed
383      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
384      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
385      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
386      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
387    
388  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
389      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
390    
391  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
392      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
393      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
394      the first (A) could occur when it should not.      the first (A) could occur when it should not.
395    
396  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
397    
398  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
399    
400  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
401      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
402      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
403    
404    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
405    
406    14. Perl does not support \N without a following name in a [] class; PCRE now
407        also gives an error.
408    
409    15. If a forward reference was repeated with an upper limit of around 2000,
410        it caused the error "internal error: overran compiling workspace". The
411        maximum number of forward references (including repeats) was limited by the
412        internal workspace, and dependent on the LINK_SIZE. The code has been
413        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
414        the default depends on LINK_SIZE. There is a new upper limit (for safety)
415        of around 200,000 forward references. While doing this, I also speeded up
416        the filling in of repeated forward references.
417    
418    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
419        incorrectly expecting the subject to contain another "a" after the start.
420    
421    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
422        in the match, the SKIP should be ignored. This was not happening; instead
423        the SKIP was being treated as NOMATCH. For patterns such as
424        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
425        tested.
426    
427    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
428        now much more compatible with Perl, in particular in cases where the result
429        is a non-match for a non-anchored pattern. For example, if
430        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
431        "m", where previously it did not return a name. A side effect of this
432        change is that for partial matches, the last encountered mark name is
433        returned, as for non matches. A number of tests that were previously not
434        Perl-compatible have been moved into the Perl-compatible test files. The
435        refactoring has had the pleasing side effect of removing one argument from
436        the match() function, thus reducing its stack requirements.
437    
438    19. If the /S+ option was used in pcretest to study a pattern using JIT,
439        subsequent uses of /S (without +) incorrectly behaved like /S+.
440    
441    21. Retrieve executable code size support for the JIT compiler and fixing
442        some warnings.
443    
444    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
445        not work when the shorter character appeared right at the end of the
446        subject string.
447    
448    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
449        systems.
450    
451    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
452        output it when the /M option is used in pcretest.
453    
454    25. The CheckMan script was not being included in the distribution. Also, added
455        an explicit "perl" to run Perl scripts from the PrepareRelease script
456        because this is reportedly needed in Windows.
457    
458    26. If study data was being save in a file and studying had not found a set of
459        "starts with" bytes for the pattern, the data written to the file (though
460        never used) was taken from uninitialized memory and so caused valgrind to
461        complain.
462    
463    27. Updated RunTest.bat as provided by Sheri Pierce.
464    
465    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
466    
467    29. Computation of memory usage for the table of capturing group names was
468        giving an unnecessarily large value.
469    
470    
471  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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