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revision 713 by ph10, Tue Sep 27 11:03:15 2011 UTC revision 893 by ph10, Thu Jan 19 17:15:11 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 23-Sep-2011  Version 8.30
5    ------------
6    
7    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
8        name is defined in ctype.h.
9    
10    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
11        only in quite long subpatterns.
12    
13    3.  Removed the function pcre_info(), which has been obsolete and deprecated
14        since it was replaced by pcre_fullinfo() in February 2000.
15    
16    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
17        match a (*MARK), and the match failed at the start of the subject, a
18        reference to memory before the start of the subject could occur. This bug
19        was introduced by fix 17 of release 8.21.
20    
21    5.  A reference to an unset group with zero minimum repetition was giving
22        totally wrong answers (in non-JavaScript-compatibility mode). For example,
23        /(another)?(\1?)test/ matched against "hello world test". This bug was
24        introduced in release 8.13.
25    
26    6.  Add support for 16-bit character strings (a large amount of work involving
27        many changes and refactorings).
28    
29    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
30        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
31        from a file.
32    
33    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
34        rounding is not applied in this particular case).
35    
36    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
37        if they appear, or are escaped, in patterns.
38    
39    10. Get rid of a number of -Wunused-but-set-variable warnings.
40    
41    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
42        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
43        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
44        also returns the mark "x". This bug applied to capturing parentheses,
45        non-capturing parentheses, and atomic parentheses. It also applied to some
46        assertions.
47    
48    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
49        information out of configure.ac instead of relying on pcre.h.generic, which
50        is not stored in the repository.
51    
52    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
53        -lreadline.
54    
55    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
56    
57    15. Applied Graycode's patch to put the top-level frame on the stack rather
58        than the heap when not using the stack for recursion. This gives a
59        performance improvement in many cases when recursion is not deep.
60    
61    16. Experimental code added to "pcretest -C" to output the stack frame size.
62    
63    
64    Version 8.21 12-Dec-2011
65    ------------------------
66    
67    1.  Updating the JIT compiler.
68    
69    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
70        are added as well.
71    
72    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
73        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
74        calling _pcre_jit_exec. Some extra comments are added.
75    
76    4.  (*MARK) settings inside atomic groups that do not contain any capturing
77        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
78        was introduced by change 18 for 8.20.
79    
80    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
81        ECMA-262 standard.
82    
83    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
84        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
85        This bug was probably introduced by change 9 of 8.13.
86    
87    7.  While fixing 6 above, I noticed that a number of other items were being
88        incorrectly rejected as "not fixed length". This arose partly because newer
89        opcodes had not been added to the fixed-length checking code. I have (a)
90        corrected the bug and added tests for these items, and (b) arranged for an
91        error to occur if an unknown opcode is encountered while checking for fixed
92        length instead of just assuming "not fixed length". The items that were
93        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
94        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
95        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
96    
97    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
98        being incorrectly compiled and would have given unpredicatble results.
99    
100    9.  A possessively repeated subpattern with minimum repeat count greater than
101        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
102        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
103        the first (A) could occur when it should not.
104    
105    10. Add a cast and remove a redundant test from the code.
106    
107    11. JIT should use pcre_malloc/pcre_free for allocation.
108    
109    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
110        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
111        is anything other than /usr, -L is still shown).
112    
113    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
114    
115    14. Perl does not support \N without a following name in a [] class; PCRE now
116        also gives an error.
117    
118    15. If a forward reference was repeated with an upper limit of around 2000,
119        it caused the error "internal error: overran compiling workspace". The
120        maximum number of forward references (including repeats) was limited by the
121        internal workspace, and dependent on the LINK_SIZE. The code has been
122        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
123        the default depends on LINK_SIZE. There is a new upper limit (for safety)
124        of around 200,000 forward references. While doing this, I also speeded up
125        the filling in of repeated forward references.
126    
127    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
128        incorrectly expecting the subject to contain another "a" after the start.
129    
130    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
131        in the match, the SKIP should be ignored. This was not happening; instead
132        the SKIP was being treated as NOMATCH. For patterns such as
133        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
134        tested.
135    
136    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
137        now much more compatible with Perl, in particular in cases where the result
138        is a non-match for a non-anchored pattern. For example, if
139        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
140        "m", where previously it did not return a name. A side effect of this
141        change is that for partial matches, the last encountered mark name is
142        returned, as for non matches. A number of tests that were previously not
143        Perl-compatible have been moved into the Perl-compatible test files. The
144        refactoring has had the pleasing side effect of removing one argument from
145        the match() function, thus reducing its stack requirements.
146    
147    19. If the /S+ option was used in pcretest to study a pattern using JIT,
148        subsequent uses of /S (without +) incorrectly behaved like /S+.
149    
150    21. Retrieve executable code size support for the JIT compiler and fixing
151        some warnings.
152    
153    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
154        not work when the shorter character appeared right at the end of the
155        subject string.
156    
157    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
158        systems.
159    
160    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
161        output it when the /M option is used in pcretest.
162    
163    25. The CheckMan script was not being included in the distribution. Also, added
164        an explicit "perl" to run Perl scripts from the PrepareRelease script
165        because this is reportedly needed in Windows.
166    
167    26. If study data was being save in a file and studying had not found a set of
168        "starts with" bytes for the pattern, the data written to the file (though
169        never used) was taken from uninitialized memory and so caused valgrind to
170        complain.
171    
172    27. Updated RunTest.bat as provided by Sheri Pierce.
173    
174    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
175    
176    29. Computation of memory usage for the table of capturing group names was
177        giving an unnecessarily large value.
178    
179    
180    Version 8.20 21-Oct-2011
181  ------------------------  ------------------------
182    
183  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
# Line 52  Version 8.20 23-Sep-2011 Line 228  Version 8.20 23-Sep-2011
228      so that no minimum is registered for a pattern that contains *ACCEPT.      so that no minimum is registered for a pattern that contains *ACCEPT.
229    
230  8.  If (*THEN) was present in the first (true) branch of a conditional group,  8.  If (*THEN) was present in the first (true) branch of a conditional group,
231      it was not handled as intended.      it was not handled as intended. [But see 16 below.]
232    
233  9.  Replaced RunTest.bat with the much improved version provided by Sheri  9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
234      Pierce.      Sheri Pierce.
235    
236  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
237      the first byte in a match must be "a".      the first byte in a match must be "a".
# Line 65  Version 8.20 23-Sep-2011 Line 241  Version 8.20 23-Sep-2011
241      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
242      optimizations are restored. It would be nice to do this on a per-group      optimizations are restored. It would be nice to do this on a per-group
243      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
244    
245  12. In some environments, the output of pcretest -C is CRLF terminated. This  12. In some environments, the output of pcretest -C is CRLF terminated. This
246      broke RunTest's code that checks for the link size. A single white space      broke RunTest's code that checks for the link size. A single white space
247      after the value is now allowed for.      character after the value is now allowed for.
248    
249  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
250      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
251    
252  14. If (*THEN) appeared in a group that was called recursively or as a  14. If (*THEN) appeared in a group that was called recursively or as a
253      subroutine, it did not work as intended.      subroutine, it did not work as intended. [But see next item.]
254    
255    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
256        pattern fragments (but not containing any | characters). If A and B are
257        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
258        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
259        D. In other words, Perl considers parentheses that do not contain any |
260        characters to be part of a surrounding alternative, whereas PCRE was
261        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
262        differently. PCRE now behaves in the same way as Perl, except in the case
263        of subroutine/recursion calls such as (?1) which have in any case always
264        been different (but PCRE had them first :-).
265    
266    16. Related to 15 above: Perl does not treat the | in a conditional group as
267        creating alternatives. Such a group is treated in the same way as an
268        ordinary group without any | characters when processing (*THEN). PCRE has
269        been changed to match Perl's behaviour.
270    
271    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
272        RunGrepTest script failed.
273    
274    18. Change 22 for version 13 caused atomic groups to use more stack. This is
275        inevitable for groups that contain captures, but it can lead to a lot of
276        stack use in large patterns. The old behaviour has been restored for atomic
277        groups that do not contain any capturing parentheses.
278    
279    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
280        suppress the check for a minimum subject length at run time. (If it was
281        given to pcre_exec() or pcre_dfa_exec() it did work.)
282    
283    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
284        fail to work when decoding hex characters in data strings in EBCDIC
285        environments.
286    
287    21. It appears that in at least one Mac OS environment, the isxdigit() function
288        is implemented as a macro that evaluates to its argument more than once,
289        contravening the C 90 Standard (I haven't checked a later standard). There
290        was an instance in pcretest which caused it to go wrong when processing
291        \x{...} escapes in subject strings. The has been rewritten to avoid using
292        things like p++ in the argument of isxdigit().
293    
294    
295  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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