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revision 741 by zherczeg, Mon Oct 31 09:31:46 2011 UTC revision 962 by ph10, Fri Apr 20 17:28:23 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  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    4.  Partial matching support is added to the JIT compiler.
16    
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
19    
20        (a) /^(..)\1/ did not partially match "aba" because checking references was
21            done on an "all or nothing" basis. This also applied to repeated
22            references.
23    
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
26    
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
29    
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
32    
33        (e) When newline was set to CRLF, the metacharacter "." did not recognize
34            a partial match for a CR character at the end of the subject string.
35    
36    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
37        running pcretest, the text "(JIT)" added to the output whenever JIT is
38        actually used to run the match.
39    
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
42    
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
44    
45    9.  (*MARK) control verb is now supported by the JIT compiler.
46    
47    10. The command "./RunTest list" lists the available tests without actually
48        running any of them. (Because I keep forgetting what they all are.)
49    
50    11. Add PCRE_INFO_MAXLOOKBEHIND.
51    
52    12. Applied a (slightly modified) user-supplied patch that improves performance
53        when the heap is used for recursion (compiled with --disable-stack-for-
54        recursion). Instead of malloc and free for each heap frame each time a
55        logical recursion happens, frames are retained on a chain and re-used where
56        possible. This sometimes gives as much as 30% improvement.
57    
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
60    
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
62    
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
65    
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
67    
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
69    
70    18. Added --file-list option to pcregrep.
71    
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
74    
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
77    
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
79    
80    22. Changed the option for creating symbolic links for 16-bit man pages from
81        -s to -sf so that re-installing does not cause issues.
82    
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
84    
85    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
86        matches in certain environments (the workspace was not being correctly
87        retained). Also added to pcre_dfa_exec() a simple plausibility check on
88        some of the workspace data at the beginning of a restart.
89    
90    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
91        was not doing so when it should - probably a typo introduced by SVN 528
92        (change 8.10/14).
93    
94    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
95        \w+ when the character tables indicated that \x{c4} was a word character.
96        There were several related cases, all because the tests for doing a table
97        lookup were testing for characters less than 127 instead of 255.
98    
99    
100    Version 8.30 04-February-2012
101    -----------------------------
102    
103    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
104        name is defined in ctype.h.
105    
106    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
107        only in quite long subpatterns.
108    
109    3.  Removed the function pcre_info(), which has been obsolete and deprecated
110        since it was replaced by pcre_fullinfo() in February 2000.
111    
112    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
113        match a (*MARK), and the match failed at the start of the subject, a
114        reference to memory before the start of the subject could occur. This bug
115        was introduced by fix 17 of release 8.21.
116    
117    5.  A reference to an unset group with zero minimum repetition was giving
118        totally wrong answers (in non-JavaScript-compatibility mode). For example,
119        /(another)?(\1?)test/ matched against "hello world test". This bug was
120        introduced in release 8.13.
121    
122    6.  Add support for 16-bit character strings (a large amount of work involving
123        many changes and refactorings).
124    
125    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
126        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
127        from a file.
128    
129    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
130        rounding is not applied in this particular case).
131    
132    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
133        if they appear, or are escaped, in patterns.
134    
135    10. Get rid of a number of -Wunused-but-set-variable warnings.
136    
137    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
138        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
139        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
140        also returns the mark "x". This bug applied to capturing parentheses,
141        non-capturing parentheses, and atomic parentheses. It also applied to some
142        assertions.
143    
144    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
145        information out of configure.ac instead of relying on pcre.h.generic, which
146        is not stored in the repository.
147    
148    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
149        -lreadline.
150    
151    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
152    
153    15. Applied Graycode's patch to put the top-level frame on the stack rather
154        than the heap when not using the stack for recursion. This gives a
155        performance improvement in many cases when recursion is not deep.
156    
157    16. Experimental code added to "pcretest -C" to output the stack frame size.
158    
159    
160    Version 8.21 12-Dec-2011
161    ------------------------
162    
163  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
164    
165  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
166      are added as well.      are added as well.
167    
168    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
169        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
170        calling _pcre_jit_exec. Some extra comments are added.
171    
172    4.  (*MARK) settings inside atomic groups that do not contain any capturing
173        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
174        was introduced by change 18 for 8.20.
175    
176    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
177        ECMA-262 standard.
178    
179    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
180        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
181        This bug was probably introduced by change 9 of 8.13.
182    
183    7.  While fixing 6 above, I noticed that a number of other items were being
184        incorrectly rejected as "not fixed length". This arose partly because newer
185        opcodes had not been added to the fixed-length checking code. I have (a)
186        corrected the bug and added tests for these items, and (b) arranged for an
187        error to occur if an unknown opcode is encountered while checking for fixed
188        length instead of just assuming "not fixed length". The items that were
189        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
190        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
191        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
192    
193    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
194        being incorrectly compiled and would have given unpredicatble results.
195    
196    9.  A possessively repeated subpattern with minimum repeat count greater than
197        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
198        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
199        the first (A) could occur when it should not.
200    
201    10. Add a cast and remove a redundant test from the code.
202    
203    11. JIT should use pcre_malloc/pcre_free for allocation.
204    
205    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
206        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
207        is anything other than /usr, -L is still shown).
208    
209    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
210    
211    14. Perl does not support \N without a following name in a [] class; PCRE now
212        also gives an error.
213    
214    15. If a forward reference was repeated with an upper limit of around 2000,
215        it caused the error "internal error: overran compiling workspace". The
216        maximum number of forward references (including repeats) was limited by the
217        internal workspace, and dependent on the LINK_SIZE. The code has been
218        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
219        the default depends on LINK_SIZE. There is a new upper limit (for safety)
220        of around 200,000 forward references. While doing this, I also speeded up
221        the filling in of repeated forward references.
222    
223    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
224        incorrectly expecting the subject to contain another "a" after the start.
225    
226    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
227        in the match, the SKIP should be ignored. This was not happening; instead
228        the SKIP was being treated as NOMATCH. For patterns such as
229        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
230        tested.
231    
232    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
233        now much more compatible with Perl, in particular in cases where the result
234        is a non-match for a non-anchored pattern. For example, if
235        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
236        "m", where previously it did not return a name. A side effect of this
237        change is that for partial matches, the last encountered mark name is
238        returned, as for non matches. A number of tests that were previously not
239        Perl-compatible have been moved into the Perl-compatible test files. The
240        refactoring has had the pleasing side effect of removing one argument from
241        the match() function, thus reducing its stack requirements.
242    
243    19. If the /S+ option was used in pcretest to study a pattern using JIT,
244        subsequent uses of /S (without +) incorrectly behaved like /S+.
245    
246    21. Retrieve executable code size support for the JIT compiler and fixing
247        some warnings.
248    
249    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
250        not work when the shorter character appeared right at the end of the
251        subject string.
252    
253    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
254        systems.
255    
256    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
257        output it when the /M option is used in pcretest.
258    
259    25. The CheckMan script was not being included in the distribution. Also, added
260        an explicit "perl" to run Perl scripts from the PrepareRelease script
261        because this is reportedly needed in Windows.
262    
263    26. If study data was being save in a file and studying had not found a set of
264        "starts with" bytes for the pattern, the data written to the file (though
265        never used) was taken from uninitialized memory and so caused valgrind to
266        complain.
267    
268    27. Updated RunTest.bat as provided by Sheri Pierce.
269    
270    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
271    
272    29. Computation of memory usage for the table of capturing group names was
273        giving an unnecessarily large value.
274    
275    
276  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
277  ------------------------  ------------------------

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