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revision 754 by ph10, Sat Nov 19 18:32:18 2011 UTC revision 1019 by ph10, Mon Aug 27 13:15:02 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    
60    
61    Version 8.31 06-July-2012
62    -------------------------
63    
64    1.  Fixing a wrong JIT test case and some compiler warnings.
65    
66    2.  Removed a bashism from the RunTest script.
67    
68    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
69        to unsigned type, result still unsigned" that was given by an MS compiler
70        on encountering the code "-sizeof(xxx)".
71    
72    4.  Partial matching support is added to the JIT compiler.
73    
74    5.  Fixed several bugs concerned with partial matching of items that consist
75        of more than one character:
76    
77        (a) /^(..)\1/ did not partially match "aba" because checking references was
78            done on an "all or nothing" basis. This also applied to repeated
79            references.
80    
81        (b) \R did not give a hard partial match if \r was found at the end of the
82            subject.
83    
84        (c) \X did not give a hard partial match after matching one or more
85            characters at the end of the subject.
86    
87        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
88            a partial match for the string "\r".
89    
90        (e) When newline was set to CRLF, the metacharacter "." did not recognize
91            a partial match for a CR character at the end of the subject string.
92    
93    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
94        running pcretest, the text "(JIT)" added to the output whenever JIT is
95        actually used to run the match.
96    
97    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
98        or /S+[+] with a digit between 1 and 7.
99    
100    8.  OP_NOT now supports any UTF character not just single-byte ones.
101    
102    9.  (*MARK) control verb is now supported by the JIT compiler.
103    
104    10. The command "./RunTest list" lists the available tests without actually
105        running any of them. (Because I keep forgetting what they all are.)
106    
107    11. Add PCRE_INFO_MAXLOOKBEHIND.
108    
109    12. Applied a (slightly modified) user-supplied patch that improves performance
110        when the heap is used for recursion (compiled with --disable-stack-for-
111        recursion). Instead of malloc and free for each heap frame each time a
112        logical recursion happens, frames are retained on a chain and re-used where
113        possible. This sometimes gives as much as 30% improvement.
114    
115    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
116        call.
117    
118    14. As documented, (*COMMIT) is now confined to within a positive assertion.
119    
120    15. It is now possible to link pcretest with libedit as an alternative to
121        libreadline.
122    
123    16. (*COMMIT) control verb is now supported by the JIT compiler.
124    
125    17. The Unicode data tables have been updated to Unicode 6.1.0.
126    
127    18. Added --file-list option to pcregrep.
128    
129    19. Added binary file support to pcregrep, including the -a, --binary-files,
130        -I, and --text options.
131    
132    20. The madvise function is renamed for posix_madvise for QNX compatibility
133        reasons. Fixed by Giuseppe D'Angelo.
134    
135    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
136    
137    22. Changed the option for creating symbolic links for 16-bit man pages from
138        -s to -sf so that re-installing does not cause issues.
139    
140    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
141    
142    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
143        matches in certain environments (the workspace was not being correctly
144        retained). Also added to pcre_dfa_exec() a simple plausibility check on
145        some of the workspace data at the beginning of a restart.
146    
147    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
148        was not doing so when it should - probably a typo introduced by SVN 528
149        (change 8.10/14).
150    
151    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
152        \w+ when the character tables indicated that \x{c4} was a word character.
153        There were several related cases, all because the tests for doing a table
154        lookup were testing for characters less than 127 instead of 255.
155    
156    27. If a pattern contains capturing parentheses that are not used in a match,
157        their slots in the ovector are set to -1. For those that are higher than
158        any matched groups, this happens at the end of processing. In the case when
159        there were back references that the ovector was too small to contain
160        (causing temporary malloc'd memory to be used during matching), and the
161        highest capturing number was not used, memory off the end of the ovector
162        was incorrectly being set to -1. (It was using the size of the temporary
163        memory instead of the true size.)
164    
165    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
166        ovector size, it uses memory at the end of the block that it has got.
167    
168    29. Check for an overlong MARK name and give an error at compile time. The
169        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
170    
171    30. JIT compiler update.
172    
173    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
174        Rill for the patch.
175    
176    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
177    
178    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
179    
180    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
181        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
182        was enabled.
183    
184    35. Improve JIT code generation for greedy plus quantifier.
185    
186    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
187        1 to "aa" instead of to an empty string. The bug affected repeated groups
188        that could potentially match an empty string.
189    
190    37. Optimizing single character iterators in JIT.
191    
192    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
193        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
194        codepoints that are too big for the mode are faulted, and in a UTF mode,
195        disallowed codepoints are also faulted.
196    
197    39. If PCRE was compiled with UTF support, in three places in the DFA
198        matcher there was code that should only have been obeyed in UTF mode, but
199        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
200        processing when bytes with values greater than 127 were present. In 16-bit
201        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
202        both cases the values are those that cannot be the first data item in a UTF
203        character. The three items that might have provoked this were recursions,
204        possessively repeated groups, and atomic groups.
205    
206    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
207        and pcregrep, because some OS require shared objects to be explicitly
208        passed to ld, causing the link step to fail if they are not.
209    
210    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
211        mode, patterns that started with \h* or \R* might be incorrectly matched.
212    
213    
214    Version 8.30 04-February-2012
215    -----------------------------
216    
217    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
218        name is defined in ctype.h.
219    
220    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
221        only in quite long subpatterns.
222    
223    3.  Removed the function pcre_info(), which has been obsolete and deprecated
224        since it was replaced by pcre_fullinfo() in February 2000.
225    
226    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
227        match a (*MARK), and the match failed at the start of the subject, a
228        reference to memory before the start of the subject could occur. This bug
229        was introduced by fix 17 of release 8.21.
230    
231    5.  A reference to an unset group with zero minimum repetition was giving
232        totally wrong answers (in non-JavaScript-compatibility mode). For example,
233        /(another)?(\1?)test/ matched against "hello world test". This bug was
234        introduced in release 8.13.
235    
236    6.  Add support for 16-bit character strings (a large amount of work involving
237        many changes and refactorings).
238    
239    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
240        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
241        from a file.
242    
243    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
244        rounding is not applied in this particular case).
245    
246    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
247        if they appear, or are escaped, in patterns.
248    
249    10. Get rid of a number of -Wunused-but-set-variable warnings.
250    
251    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
252        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
253        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
254        also returns the mark "x". This bug applied to capturing parentheses,
255        non-capturing parentheses, and atomic parentheses. It also applied to some
256        assertions.
257    
258    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
259        information out of configure.ac instead of relying on pcre.h.generic, which
260        is not stored in the repository.
261    
262    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
263        -lreadline.
264    
265    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
266    
267    15. Applied Graycode's patch to put the top-level frame on the stack rather
268        than the heap when not using the stack for recursion. This gives a
269        performance improvement in many cases when recursion is not deep.
270    
271    16. Experimental code added to "pcretest -C" to output the stack frame size.
272    
273    
274    Version 8.21 12-Dec-2011
275    ------------------------
276    
277  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
278    
279  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 283  Version 8.21
283      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
284      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
285    
286  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
287      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
288      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
289    
# Line 22  Version 8.21 Line 292  Version 8.21
292    
293  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
294      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
295      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
296    
297  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
298      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
299      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)
300      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
301      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
302      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
303      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
304      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
305      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
306    
307  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
308      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
309    
310  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
311      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
312      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
313      the first (A) could occur when it should not.      the first (A) could occur when it should not.
314    
315  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
316    
317  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
318    
319  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
320      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
321      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
322    
323  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
324    
325    14. Perl does not support \N without a following name in a [] class; PCRE now
326        also gives an error.
327    
328    15. If a forward reference was repeated with an upper limit of around 2000,
329        it caused the error "internal error: overran compiling workspace". The
330        maximum number of forward references (including repeats) was limited by the
331        internal workspace, and dependent on the LINK_SIZE. The code has been
332        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
333        the default depends on LINK_SIZE. There is a new upper limit (for safety)
334        of around 200,000 forward references. While doing this, I also speeded up
335        the filling in of repeated forward references.
336    
337    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
338        incorrectly expecting the subject to contain another "a" after the start.
339    
340    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
341        in the match, the SKIP should be ignored. This was not happening; instead
342        the SKIP was being treated as NOMATCH. For patterns such as
343        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
344        tested.
345    
346    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
347        now much more compatible with Perl, in particular in cases where the result
348        is a non-match for a non-anchored pattern. For example, if
349        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
350        "m", where previously it did not return a name. A side effect of this
351        change is that for partial matches, the last encountered mark name is
352        returned, as for non matches. A number of tests that were previously not
353        Perl-compatible have been moved into the Perl-compatible test files. The
354        refactoring has had the pleasing side effect of removing one argument from
355        the match() function, thus reducing its stack requirements.
356    
357    19. If the /S+ option was used in pcretest to study a pattern using JIT,
358        subsequent uses of /S (without +) incorrectly behaved like /S+.
359    
360    21. Retrieve executable code size support for the JIT compiler and fixing
361        some warnings.
362    
363    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
364        not work when the shorter character appeared right at the end of the
365        subject string.
366    
367    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
368        systems.
369    
370    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
371        output it when the /M option is used in pcretest.
372    
373    25. The CheckMan script was not being included in the distribution. Also, added
374        an explicit "perl" to run Perl scripts from the PrepareRelease script
375        because this is reportedly needed in Windows.
376    
377    26. If study data was being save in a file and studying had not found a set of
378        "starts with" bytes for the pattern, the data written to the file (though
379        never used) was taken from uninitialized memory and so caused valgrind to
380        complain.
381    
382    27. Updated RunTest.bat as provided by Sheri Pierce.
383    
384    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
385    
386    29. Computation of memory usage for the table of capturing group names was
387        giving an unnecessarily large value.
388    
389    
390  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
391  ------------------------  ------------------------

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