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revision 754 by ph10, Sat Nov 19 18:32:18 2011 UTC revision 1009 by zherczeg, Wed Aug 22 12:01:22 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    
54    Version 8.31 06-July-2012
55    -------------------------
56    
57    1.  Fixing a wrong JIT test case and some compiler warnings.
58    
59    2.  Removed a bashism from the RunTest script.
60    
61    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
62        to unsigned type, result still unsigned" that was given by an MS compiler
63        on encountering the code "-sizeof(xxx)".
64    
65    4.  Partial matching support is added to the JIT compiler.
66    
67    5.  Fixed several bugs concerned with partial matching of items that consist
68        of more than one character:
69    
70        (a) /^(..)\1/ did not partially match "aba" because checking references was
71            done on an "all or nothing" basis. This also applied to repeated
72            references.
73    
74        (b) \R did not give a hard partial match if \r was found at the end of the
75            subject.
76    
77        (c) \X did not give a hard partial match after matching one or more
78            characters at the end of the subject.
79    
80        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
81            a partial match for the string "\r".
82    
83        (e) When newline was set to CRLF, the metacharacter "." did not recognize
84            a partial match for a CR character at the end of the subject string.
85    
86    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
87        running pcretest, the text "(JIT)" added to the output whenever JIT is
88        actually used to run the match.
89    
90    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
91        or /S+[+] with a digit between 1 and 7.
92    
93    8.  OP_NOT now supports any UTF character not just single-byte ones.
94    
95    9.  (*MARK) control verb is now supported by the JIT compiler.
96    
97    10. The command "./RunTest list" lists the available tests without actually
98        running any of them. (Because I keep forgetting what they all are.)
99    
100    11. Add PCRE_INFO_MAXLOOKBEHIND.
101    
102    12. Applied a (slightly modified) user-supplied patch that improves performance
103        when the heap is used for recursion (compiled with --disable-stack-for-
104        recursion). Instead of malloc and free for each heap frame each time a
105        logical recursion happens, frames are retained on a chain and re-used where
106        possible. This sometimes gives as much as 30% improvement.
107    
108    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
109        call.
110    
111    14. As documented, (*COMMIT) is now confined to within a positive assertion.
112    
113    15. It is now possible to link pcretest with libedit as an alternative to
114        libreadline.
115    
116    16. (*COMMIT) control verb is now supported by the JIT compiler.
117    
118    17. The Unicode data tables have been updated to Unicode 6.1.0.
119    
120    18. Added --file-list option to pcregrep.
121    
122    19. Added binary file support to pcregrep, including the -a, --binary-files,
123        -I, and --text options.
124    
125    20. The madvise function is renamed for posix_madvise for QNX compatibility
126        reasons. Fixed by Giuseppe D'Angelo.
127    
128    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
129    
130    22. Changed the option for creating symbolic links for 16-bit man pages from
131        -s to -sf so that re-installing does not cause issues.
132    
133    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
134    
135    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
136        matches in certain environments (the workspace was not being correctly
137        retained). Also added to pcre_dfa_exec() a simple plausibility check on
138        some of the workspace data at the beginning of a restart.
139    
140    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
141        was not doing so when it should - probably a typo introduced by SVN 528
142        (change 8.10/14).
143    
144    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
145        \w+ when the character tables indicated that \x{c4} was a word character.
146        There were several related cases, all because the tests for doing a table
147        lookup were testing for characters less than 127 instead of 255.
148    
149    27. If a pattern contains capturing parentheses that are not used in a match,
150        their slots in the ovector are set to -1. For those that are higher than
151        any matched groups, this happens at the end of processing. In the case when
152        there were back references that the ovector was too small to contain
153        (causing temporary malloc'd memory to be used during matching), and the
154        highest capturing number was not used, memory off the end of the ovector
155        was incorrectly being set to -1. (It was using the size of the temporary
156        memory instead of the true size.)
157    
158    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
159        ovector size, it uses memory at the end of the block that it has got.
160    
161    29. Check for an overlong MARK name and give an error at compile time. The
162        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
163    
164    30. JIT compiler update.
165    
166    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
167        Rill for the patch.
168    
169    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
170    
171    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
172    
173    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
174        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
175        was enabled.
176    
177    35. Improve JIT code generation for greedy plus quantifier.
178    
179    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
180        1 to "aa" instead of to an empty string. The bug affected repeated groups
181        that could potentially match an empty string.
182    
183    37. Optimizing single character iterators in JIT.
184    
185    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
186        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
187        codepoints that are too big for the mode are faulted, and in a UTF mode,
188        disallowed codepoints are also faulted.
189    
190    39. If PCRE was compiled with UTF support, in three places in the DFA
191        matcher there was code that should only have been obeyed in UTF mode, but
192        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
193        processing when bytes with values greater than 127 were present. In 16-bit
194        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
195        both cases the values are those that cannot be the first data item in a UTF
196        character. The three items that might have provoked this were recursions,
197        possessively repeated groups, and atomic groups.
198    
199    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
200        and pcregrep, because some OS require shared objects to be explicitly
201        passed to ld, causing the link step to fail if they are not.
202    
203    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
204        mode, patterns that started with \h* or \R* might be incorrectly matched.
205    
206    
207    Version 8.30 04-February-2012
208    -----------------------------
209    
210    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
211        name is defined in ctype.h.
212    
213    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
214        only in quite long subpatterns.
215    
216    3.  Removed the function pcre_info(), which has been obsolete and deprecated
217        since it was replaced by pcre_fullinfo() in February 2000.
218    
219    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
220        match a (*MARK), and the match failed at the start of the subject, a
221        reference to memory before the start of the subject could occur. This bug
222        was introduced by fix 17 of release 8.21.
223    
224    5.  A reference to an unset group with zero minimum repetition was giving
225        totally wrong answers (in non-JavaScript-compatibility mode). For example,
226        /(another)?(\1?)test/ matched against "hello world test". This bug was
227        introduced in release 8.13.
228    
229    6.  Add support for 16-bit character strings (a large amount of work involving
230        many changes and refactorings).
231    
232    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
233        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
234        from a file.
235    
236    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
237        rounding is not applied in this particular case).
238    
239    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
240        if they appear, or are escaped, in patterns.
241    
242    10. Get rid of a number of -Wunused-but-set-variable warnings.
243    
244    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
245        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
246        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
247        also returns the mark "x". This bug applied to capturing parentheses,
248        non-capturing parentheses, and atomic parentheses. It also applied to some
249        assertions.
250    
251    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
252        information out of configure.ac instead of relying on pcre.h.generic, which
253        is not stored in the repository.
254    
255    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
256        -lreadline.
257    
258    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
259    
260    15. Applied Graycode's patch to put the top-level frame on the stack rather
261        than the heap when not using the stack for recursion. This gives a
262        performance improvement in many cases when recursion is not deep.
263    
264    16. Experimental code added to "pcretest -C" to output the stack frame size.
265    
266    
267    Version 8.21 12-Dec-2011
268    ------------------------
269    
270  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
271    
272  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 276  Version 8.21
276      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
277      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
278    
279  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
280      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
281      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
282    
# Line 22  Version 8.21 Line 285  Version 8.21
285    
286  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
287      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
288      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
289    
290  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
291      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
292      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)
293      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
294      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
295      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
296      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
297      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
298      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
299    
300  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
301      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
302    
303  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
304      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
305      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
306      the first (A) could occur when it should not.      the first (A) could occur when it should not.
307    
308  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
309    
310  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
311    
312  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
313      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
314      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
315    
316  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.
317    
318    14. Perl does not support \N without a following name in a [] class; PCRE now
319        also gives an error.
320    
321    15. If a forward reference was repeated with an upper limit of around 2000,
322        it caused the error "internal error: overran compiling workspace". The
323        maximum number of forward references (including repeats) was limited by the
324        internal workspace, and dependent on the LINK_SIZE. The code has been
325        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
326        the default depends on LINK_SIZE. There is a new upper limit (for safety)
327        of around 200,000 forward references. While doing this, I also speeded up
328        the filling in of repeated forward references.
329    
330    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
331        incorrectly expecting the subject to contain another "a" after the start.
332    
333    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
334        in the match, the SKIP should be ignored. This was not happening; instead
335        the SKIP was being treated as NOMATCH. For patterns such as
336        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
337        tested.
338    
339    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
340        now much more compatible with Perl, in particular in cases where the result
341        is a non-match for a non-anchored pattern. For example, if
342        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
343        "m", where previously it did not return a name. A side effect of this
344        change is that for partial matches, the last encountered mark name is
345        returned, as for non matches. A number of tests that were previously not
346        Perl-compatible have been moved into the Perl-compatible test files. The
347        refactoring has had the pleasing side effect of removing one argument from
348        the match() function, thus reducing its stack requirements.
349    
350    19. If the /S+ option was used in pcretest to study a pattern using JIT,
351        subsequent uses of /S (without +) incorrectly behaved like /S+.
352    
353    21. Retrieve executable code size support for the JIT compiler and fixing
354        some warnings.
355    
356    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
357        not work when the shorter character appeared right at the end of the
358        subject string.
359    
360    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
361        systems.
362    
363    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
364        output it when the /M option is used in pcretest.
365    
366    25. The CheckMan script was not being included in the distribution. Also, added
367        an explicit "perl" to run Perl scripts from the PrepareRelease script
368        because this is reportedly needed in Windows.
369    
370    26. If study data was being save in a file and studying had not found a set of
371        "starts with" bytes for the pattern, the data written to the file (though
372        never used) was taken from uninitialized memory and so caused valgrind to
373        complain.
374    
375    27. Updated RunTest.bat as provided by Sheri Pierce.
376    
377    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
378    
379    29. Computation of memory usage for the table of capturing group names was
380        giving an unnecessarily large value.
381    
382    
383  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
384  ------------------------  ------------------------

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