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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 922 by ph10, Mon Feb 20 18:44:42 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.  When matching is performed using JIT-compiled code, the flag bit
37        PCRE_EXTRA_USED_JIT is set in the pcre_extra block and can be tested by the
38        caller. This bit is checked by pcretest if JIT is requested by /S++ or -s++
39        (instead of just /S+ or -s+) and the text "(JIT)" added to the output if
40        the bit is set.
41    
42    
43    Version 8.30 04-February-2012
44    -----------------------------
45    
46    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
47        name is defined in ctype.h.
48    
49    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
50        only in quite long subpatterns.
51    
52    3.  Removed the function pcre_info(), which has been obsolete and deprecated
53        since it was replaced by pcre_fullinfo() in February 2000.
54    
55    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
56        match a (*MARK), and the match failed at the start of the subject, a
57        reference to memory before the start of the subject could occur. This bug
58        was introduced by fix 17 of release 8.21.
59    
60    5.  A reference to an unset group with zero minimum repetition was giving
61        totally wrong answers (in non-JavaScript-compatibility mode). For example,
62        /(another)?(\1?)test/ matched against "hello world test". This bug was
63        introduced in release 8.13.
64    
65    6.  Add support for 16-bit character strings (a large amount of work involving
66        many changes and refactorings).
67    
68    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
69        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
70        from a file.
71    
72    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
73        rounding is not applied in this particular case).
74    
75    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
76        if they appear, or are escaped, in patterns.
77    
78    10. Get rid of a number of -Wunused-but-set-variable warnings.
79    
80    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
81        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
82        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
83        also returns the mark "x". This bug applied to capturing parentheses,
84        non-capturing parentheses, and atomic parentheses. It also applied to some
85        assertions.
86    
87    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
88        information out of configure.ac instead of relying on pcre.h.generic, which
89        is not stored in the repository.
90    
91    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
92        -lreadline.
93    
94    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
95    
96    15. Applied Graycode's patch to put the top-level frame on the stack rather
97        than the heap when not using the stack for recursion. This gives a
98        performance improvement in many cases when recursion is not deep.
99    
100    16. Experimental code added to "pcretest -C" to output the stack frame size.
101    
102    
103    Version 8.21 12-Dec-2011
104    ------------------------
105    
106  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
107    
108    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
109        are added as well.
110    
111    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
112        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
113        calling _pcre_jit_exec. Some extra comments are added.
114    
115    4.  (*MARK) settings inside atomic groups that do not contain any capturing
116        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
117        was introduced by change 18 for 8.20.
118    
119    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
120        ECMA-262 standard.
121    
122    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
123        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
124        This bug was probably introduced by change 9 of 8.13.
125    
126    7.  While fixing 6 above, I noticed that a number of other items were being
127        incorrectly rejected as "not fixed length". This arose partly because newer
128        opcodes had not been added to the fixed-length checking code. I have (a)
129        corrected the bug and added tests for these items, and (b) arranged for an
130        error to occur if an unknown opcode is encountered while checking for fixed
131        length instead of just assuming "not fixed length". The items that were
132        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
133        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
134        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
135    
136    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
137        being incorrectly compiled and would have given unpredicatble results.
138    
139    9.  A possessively repeated subpattern with minimum repeat count greater than
140        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
141        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
142        the first (A) could occur when it should not.
143    
144    10. Add a cast and remove a redundant test from the code.
145    
146    11. JIT should use pcre_malloc/pcre_free for allocation.
147    
148    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
149        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
150        is anything other than /usr, -L is still shown).
151    
152    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
153    
154    14. Perl does not support \N without a following name in a [] class; PCRE now
155        also gives an error.
156    
157    15. If a forward reference was repeated with an upper limit of around 2000,
158        it caused the error "internal error: overran compiling workspace". The
159        maximum number of forward references (including repeats) was limited by the
160        internal workspace, and dependent on the LINK_SIZE. The code has been
161        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
162        the default depends on LINK_SIZE. There is a new upper limit (for safety)
163        of around 200,000 forward references. While doing this, I also speeded up
164        the filling in of repeated forward references.
165    
166    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
167        incorrectly expecting the subject to contain another "a" after the start.
168    
169    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
170        in the match, the SKIP should be ignored. This was not happening; instead
171        the SKIP was being treated as NOMATCH. For patterns such as
172        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
173        tested.
174    
175    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
176        now much more compatible with Perl, in particular in cases where the result
177        is a non-match for a non-anchored pattern. For example, if
178        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
179        "m", where previously it did not return a name. A side effect of this
180        change is that for partial matches, the last encountered mark name is
181        returned, as for non matches. A number of tests that were previously not
182        Perl-compatible have been moved into the Perl-compatible test files. The
183        refactoring has had the pleasing side effect of removing one argument from
184        the match() function, thus reducing its stack requirements.
185    
186    19. If the /S+ option was used in pcretest to study a pattern using JIT,
187        subsequent uses of /S (without +) incorrectly behaved like /S+.
188    
189    21. Retrieve executable code size support for the JIT compiler and fixing
190        some warnings.
191    
192    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
193        not work when the shorter character appeared right at the end of the
194        subject string.
195    
196    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
197        systems.
198    
199    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
200        output it when the /M option is used in pcretest.
201    
202    25. The CheckMan script was not being included in the distribution. Also, added
203        an explicit "perl" to run Perl scripts from the PrepareRelease script
204        because this is reportedly needed in Windows.
205    
206    26. If study data was being save in a file and studying had not found a set of
207        "starts with" bytes for the pattern, the data written to the file (though
208        never used) was taken from uninitialized memory and so caused valgrind to
209        complain.
210    
211    27. Updated RunTest.bat as provided by Sheri Pierce.
212    
213    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
214    
215    29. Computation of memory usage for the table of capturing group names was
216        giving an unnecessarily large value.
217    
218    
219  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
220  ------------------------  ------------------------

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