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revision 712 by ph10, Mon Sep 26 16:31:42 2011 UTC revision 913 by ph10, Sun Feb 12 17:06:59 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.20 23-Sep-2011  Version 8.31
5    -----------------------------
6    
7    1.  Fixing a wrong JIT test case and some compiler warnings.
8    
9    2.  Removed a bashism from the RunTest script.
10    
11    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
12        to unsigned type, result still unsigned" that was given by an MS compiler
13        on encountering the code "-sizeof(xxx)".
14    
15    
16    Version 8.30 04-February-2012
17    -----------------------------
18    
19    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
20        name is defined in ctype.h.
21    
22    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
23        only in quite long subpatterns.
24    
25    3.  Removed the function pcre_info(), which has been obsolete and deprecated
26        since it was replaced by pcre_fullinfo() in February 2000.
27    
28    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
29        match a (*MARK), and the match failed at the start of the subject, a
30        reference to memory before the start of the subject could occur. This bug
31        was introduced by fix 17 of release 8.21.
32    
33    5.  A reference to an unset group with zero minimum repetition was giving
34        totally wrong answers (in non-JavaScript-compatibility mode). For example,
35        /(another)?(\1?)test/ matched against "hello world test". This bug was
36        introduced in release 8.13.
37    
38    6.  Add support for 16-bit character strings (a large amount of work involving
39        many changes and refactorings).
40    
41    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
42        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
43        from a file.
44    
45    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
46        rounding is not applied in this particular case).
47    
48    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
49        if they appear, or are escaped, in patterns.
50    
51    10. Get rid of a number of -Wunused-but-set-variable warnings.
52    
53    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
54        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
55        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
56        also returns the mark "x". This bug applied to capturing parentheses,
57        non-capturing parentheses, and atomic parentheses. It also applied to some
58        assertions.
59    
60    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
61        information out of configure.ac instead of relying on pcre.h.generic, which
62        is not stored in the repository.
63    
64    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
65        -lreadline.
66    
67    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
68    
69    15. Applied Graycode's patch to put the top-level frame on the stack rather
70        than the heap when not using the stack for recursion. This gives a
71        performance improvement in many cases when recursion is not deep.
72    
73    16. Experimental code added to "pcretest -C" to output the stack frame size.
74    
75    
76    Version 8.21 12-Dec-2011
77    ------------------------
78    
79    1.  Updating the JIT compiler.
80    
81    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
82        are added as well.
83    
84    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
85        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
86        calling _pcre_jit_exec. Some extra comments are added.
87    
88    4.  (*MARK) settings inside atomic groups that do not contain any capturing
89        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
90        was introduced by change 18 for 8.20.
91    
92    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
93        ECMA-262 standard.
94    
95    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
96        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
97        This bug was probably introduced by change 9 of 8.13.
98    
99    7.  While fixing 6 above, I noticed that a number of other items were being
100        incorrectly rejected as "not fixed length". This arose partly because newer
101        opcodes had not been added to the fixed-length checking code. I have (a)
102        corrected the bug and added tests for these items, and (b) arranged for an
103        error to occur if an unknown opcode is encountered while checking for fixed
104        length instead of just assuming "not fixed length". The items that were
105        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
106        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
107        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
108    
109    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
110        being incorrectly compiled and would have given unpredicatble results.
111    
112    9.  A possessively repeated subpattern with minimum repeat count greater than
113        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
114        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
115        the first (A) could occur when it should not.
116    
117    10. Add a cast and remove a redundant test from the code.
118    
119    11. JIT should use pcre_malloc/pcre_free for allocation.
120    
121    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
122        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
123        is anything other than /usr, -L is still shown).
124    
125    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
126    
127    14. Perl does not support \N without a following name in a [] class; PCRE now
128        also gives an error.
129    
130    15. If a forward reference was repeated with an upper limit of around 2000,
131        it caused the error "internal error: overran compiling workspace". The
132        maximum number of forward references (including repeats) was limited by the
133        internal workspace, and dependent on the LINK_SIZE. The code has been
134        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
135        the default depends on LINK_SIZE. There is a new upper limit (for safety)
136        of around 200,000 forward references. While doing this, I also speeded up
137        the filling in of repeated forward references.
138    
139    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
140        incorrectly expecting the subject to contain another "a" after the start.
141    
142    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
143        in the match, the SKIP should be ignored. This was not happening; instead
144        the SKIP was being treated as NOMATCH. For patterns such as
145        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
146        tested.
147    
148    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
149        now much more compatible with Perl, in particular in cases where the result
150        is a non-match for a non-anchored pattern. For example, if
151        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
152        "m", where previously it did not return a name. A side effect of this
153        change is that for partial matches, the last encountered mark name is
154        returned, as for non matches. A number of tests that were previously not
155        Perl-compatible have been moved into the Perl-compatible test files. The
156        refactoring has had the pleasing side effect of removing one argument from
157        the match() function, thus reducing its stack requirements.
158    
159    19. If the /S+ option was used in pcretest to study a pattern using JIT,
160        subsequent uses of /S (without +) incorrectly behaved like /S+.
161    
162    21. Retrieve executable code size support for the JIT compiler and fixing
163        some warnings.
164    
165    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
166        not work when the shorter character appeared right at the end of the
167        subject string.
168    
169    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
170        systems.
171    
172    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
173        output it when the /M option is used in pcretest.
174    
175    25. The CheckMan script was not being included in the distribution. Also, added
176        an explicit "perl" to run Perl scripts from the PrepareRelease script
177        because this is reportedly needed in Windows.
178    
179    26. If study data was being save in a file and studying had not found a set of
180        "starts with" bytes for the pattern, the data written to the file (though
181        never used) was taken from uninitialized memory and so caused valgrind to
182        complain.
183    
184    27. Updated RunTest.bat as provided by Sheri Pierce.
185    
186    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
187    
188    29. Computation of memory usage for the table of capturing group names was
189        giving an unnecessarily large value.
190    
191    
192    Version 8.20 21-Oct-2011
193  ------------------------  ------------------------
194    
195  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 240  Version 8.20 23-Sep-2011
240      so that no minimum is registered for a pattern that contains *ACCEPT.      so that no minimum is registered for a pattern that contains *ACCEPT.
241    
242  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,
243      it was not handled as intended.      it was not handled as intended. [But see 16 below.]
244    
245  9.  Replaced RunTest.bat with the much improved version provided by Sheri  9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
246      Pierce.      Sheri Pierce.
247    
248  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that  10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
249      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 253  Version 8.20 23-Sep-2011
253      pattern contains any instances of (*THEN). If it does not, the old      pattern contains any instances of (*THEN). If it does not, the old
254      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
255      basis, but at the moment that is not feasible.      basis, but at the moment that is not feasible.
256    
257  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
258      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
259      after the value is now allowed for.      character after the value is now allowed for.
260    
261  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".
262      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
263    
264    14. If (*THEN) appeared in a group that was called recursively or as a
265        subroutine, it did not work as intended. [But see next item.]
266    
267    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
268        pattern fragments (but not containing any | characters). If A and B are
269        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
270        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
271        D. In other words, Perl considers parentheses that do not contain any |
272        characters to be part of a surrounding alternative, whereas PCRE was
273        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
274        differently. PCRE now behaves in the same way as Perl, except in the case
275        of subroutine/recursion calls such as (?1) which have in any case always
276        been different (but PCRE had them first :-).
277    
278    16. Related to 15 above: Perl does not treat the | in a conditional group as
279        creating alternatives. Such a group is treated in the same way as an
280        ordinary group without any | characters when processing (*THEN). PCRE has
281        been changed to match Perl's behaviour.
282    
283    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
284        RunGrepTest script failed.
285    
286    18. Change 22 for version 13 caused atomic groups to use more stack. This is
287        inevitable for groups that contain captures, but it can lead to a lot of
288        stack use in large patterns. The old behaviour has been restored for atomic
289        groups that do not contain any capturing parentheses.
290    
291    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
292        suppress the check for a minimum subject length at run time. (If it was
293        given to pcre_exec() or pcre_dfa_exec() it did work.)
294    
295    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
296        fail to work when decoding hex characters in data strings in EBCDIC
297        environments.
298    
299    21. It appears that in at least one Mac OS environment, the isxdigit() function
300        is implemented as a macro that evaluates to its argument more than once,
301        contravening the C 90 Standard (I haven't checked a later standard). There
302        was an instance in pcretest which caused it to go wrong when processing
303        \x{...} escapes in subject strings. The has been rewritten to avoid using
304        things like p++ in the argument of isxdigit().
305    
306    
307  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011

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