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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 919 by ph10, Fri Feb 17 11:48:02 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    
37    Version 8.30 04-February-2012
38    -----------------------------
39    
40    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
41        name is defined in ctype.h.
42    
43    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
44        only in quite long subpatterns.
45    
46    3.  Removed the function pcre_info(), which has been obsolete and deprecated
47        since it was replaced by pcre_fullinfo() in February 2000.
48    
49    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
50        match a (*MARK), and the match failed at the start of the subject, a
51        reference to memory before the start of the subject could occur. This bug
52        was introduced by fix 17 of release 8.21.
53    
54    5.  A reference to an unset group with zero minimum repetition was giving
55        totally wrong answers (in non-JavaScript-compatibility mode). For example,
56        /(another)?(\1?)test/ matched against "hello world test". This bug was
57        introduced in release 8.13.
58    
59    6.  Add support for 16-bit character strings (a large amount of work involving
60        many changes and refactorings).
61    
62    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
63        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
64        from a file.
65    
66    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
67        rounding is not applied in this particular case).
68    
69    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
70        if they appear, or are escaped, in patterns.
71    
72    10. Get rid of a number of -Wunused-but-set-variable warnings.
73    
74    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
75        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
76        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
77        also returns the mark "x". This bug applied to capturing parentheses,
78        non-capturing parentheses, and atomic parentheses. It also applied to some
79        assertions.
80    
81    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
82        information out of configure.ac instead of relying on pcre.h.generic, which
83        is not stored in the repository.
84    
85    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
86        -lreadline.
87    
88    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
89    
90    15. Applied Graycode's patch to put the top-level frame on the stack rather
91        than the heap when not using the stack for recursion. This gives a
92        performance improvement in many cases when recursion is not deep.
93    
94    16. Experimental code added to "pcretest -C" to output the stack frame size.
95    
96    
97    Version 8.21 12-Dec-2011
98    ------------------------
99    
100  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
101    
102    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
103        are added as well.
104    
105    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
106        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
107        calling _pcre_jit_exec. Some extra comments are added.
108    
109    4.  (*MARK) settings inside atomic groups that do not contain any capturing
110        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
111        was introduced by change 18 for 8.20.
112    
113    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
114        ECMA-262 standard.
115    
116    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
117        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
118        This bug was probably introduced by change 9 of 8.13.
119    
120    7.  While fixing 6 above, I noticed that a number of other items were being
121        incorrectly rejected as "not fixed length". This arose partly because newer
122        opcodes had not been added to the fixed-length checking code. I have (a)
123        corrected the bug and added tests for these items, and (b) arranged for an
124        error to occur if an unknown opcode is encountered while checking for fixed
125        length instead of just assuming "not fixed length". The items that were
126        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
127        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
128        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
129    
130    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
131        being incorrectly compiled and would have given unpredicatble results.
132    
133    9.  A possessively repeated subpattern with minimum repeat count greater than
134        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
135        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
136        the first (A) could occur when it should not.
137    
138    10. Add a cast and remove a redundant test from the code.
139    
140    11. JIT should use pcre_malloc/pcre_free for allocation.
141    
142    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
143        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
144        is anything other than /usr, -L is still shown).
145    
146    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
147    
148    14. Perl does not support \N without a following name in a [] class; PCRE now
149        also gives an error.
150    
151    15. If a forward reference was repeated with an upper limit of around 2000,
152        it caused the error "internal error: overran compiling workspace". The
153        maximum number of forward references (including repeats) was limited by the
154        internal workspace, and dependent on the LINK_SIZE. The code has been
155        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
156        the default depends on LINK_SIZE. There is a new upper limit (for safety)
157        of around 200,000 forward references. While doing this, I also speeded up
158        the filling in of repeated forward references.
159    
160    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
161        incorrectly expecting the subject to contain another "a" after the start.
162    
163    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
164        in the match, the SKIP should be ignored. This was not happening; instead
165        the SKIP was being treated as NOMATCH. For patterns such as
166        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
167        tested.
168    
169    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
170        now much more compatible with Perl, in particular in cases where the result
171        is a non-match for a non-anchored pattern. For example, if
172        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
173        "m", where previously it did not return a name. A side effect of this
174        change is that for partial matches, the last encountered mark name is
175        returned, as for non matches. A number of tests that were previously not
176        Perl-compatible have been moved into the Perl-compatible test files. The
177        refactoring has had the pleasing side effect of removing one argument from
178        the match() function, thus reducing its stack requirements.
179    
180    19. If the /S+ option was used in pcretest to study a pattern using JIT,
181        subsequent uses of /S (without +) incorrectly behaved like /S+.
182    
183    21. Retrieve executable code size support for the JIT compiler and fixing
184        some warnings.
185    
186    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
187        not work when the shorter character appeared right at the end of the
188        subject string.
189    
190    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
191        systems.
192    
193    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
194        output it when the /M option is used in pcretest.
195    
196    25. The CheckMan script was not being included in the distribution. Also, added
197        an explicit "perl" to run Perl scripts from the PrepareRelease script
198        because this is reportedly needed in Windows.
199    
200    26. If study data was being save in a file and studying had not found a set of
201        "starts with" bytes for the pattern, the data written to the file (though
202        never used) was taken from uninitialized memory and so caused valgrind to
203        complain.
204    
205    27. Updated RunTest.bat as provided by Sheri Pierce.
206    
207    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
208    
209    29. Computation of memory usage for the table of capturing group names was
210        giving an unnecessarily large value.
211    
212    
213  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
214  ------------------------  ------------------------

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