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revision 741 by zherczeg, Mon Oct 31 09:31:46 2011 UTC revision 916 by ph10, Wed Feb 15 09:50:53 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.21  Version 8.31
5  ------------  -----------------------------
7    1.  Fixing a wrong JIT test case and some compiler warnings.
9    2.  Removed a bashism from the RunTest script.
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)".
15    4.  Partial matching support is added to the JIT compiler.
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
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.
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not give a
31            partial match for the string "\r".
34    Version 8.30 04-February-2012
35    -----------------------------
37    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
38        name is defined in ctype.h.
40    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
41        only in quite long subpatterns.
43    3.  Removed the function pcre_info(), which has been obsolete and deprecated
44        since it was replaced by pcre_fullinfo() in February 2000.
46    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
47        match a (*MARK), and the match failed at the start of the subject, a
48        reference to memory before the start of the subject could occur. This bug
49        was introduced by fix 17 of release 8.21.
51    5.  A reference to an unset group with zero minimum repetition was giving
52        totally wrong answers (in non-JavaScript-compatibility mode). For example,
53        /(another)?(\1?)test/ matched against "hello world test". This bug was
54        introduced in release 8.13.
56    6.  Add support for 16-bit character strings (a large amount of work involving
57        many changes and refactorings).
59    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
60        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
61        from a file.
63    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
64        rounding is not applied in this particular case).
66    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
67        if they appear, or are escaped, in patterns.
69    10. Get rid of a number of -Wunused-but-set-variable warnings.
71    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
72        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
73        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
74        also returns the mark "x". This bug applied to capturing parentheses,
75        non-capturing parentheses, and atomic parentheses. It also applied to some
76        assertions.
78    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
79        information out of configure.ac instead of relying on pcre.h.generic, which
80        is not stored in the repository.
82    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
83        -lreadline.
85    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
87    15. Applied Graycode's patch to put the top-level frame on the stack rather
88        than the heap when not using the stack for recursion. This gives a
89        performance improvement in many cases when recursion is not deep.
91    16. Experimental code added to "pcretest -C" to output the stack frame size.
94    Version 8.21 12-Dec-2011
95    ------------------------
97  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
99  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
100      are added as well.      are added as well.
102    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
103        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
104        calling _pcre_jit_exec. Some extra comments are added.
106    4.  (*MARK) settings inside atomic groups that do not contain any capturing
107        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
108        was introduced by change 18 for 8.20.
110    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
111        ECMA-262 standard.
113    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
114        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
115        This bug was probably introduced by change 9 of 8.13.
117    7.  While fixing 6 above, I noticed that a number of other items were being
118        incorrectly rejected as "not fixed length". This arose partly because newer
119        opcodes had not been added to the fixed-length checking code. I have (a)
120        corrected the bug and added tests for these items, and (b) arranged for an
121        error to occur if an unknown opcode is encountered while checking for fixed
122        length instead of just assuming "not fixed length". The items that were
123        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
124        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
125        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
127    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
128        being incorrectly compiled and would have given unpredicatble results.
130    9.  A possessively repeated subpattern with minimum repeat count greater than
131        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
132        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
133        the first (A) could occur when it should not.
135    10. Add a cast and remove a redundant test from the code.
137    11. JIT should use pcre_malloc/pcre_free for allocation.
139    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
140        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
141        is anything other than /usr, -L is still shown).
143    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
145    14. Perl does not support \N without a following name in a [] class; PCRE now
146        also gives an error.
148    15. If a forward reference was repeated with an upper limit of around 2000,
149        it caused the error "internal error: overran compiling workspace". The
150        maximum number of forward references (including repeats) was limited by the
151        internal workspace, and dependent on the LINK_SIZE. The code has been
152        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
153        the default depends on LINK_SIZE. There is a new upper limit (for safety)
154        of around 200,000 forward references. While doing this, I also speeded up
155        the filling in of repeated forward references.
157    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
158        incorrectly expecting the subject to contain another "a" after the start.
160    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
161        in the match, the SKIP should be ignored. This was not happening; instead
162        the SKIP was being treated as NOMATCH. For patterns such as
163        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
164        tested.
166    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
167        now much more compatible with Perl, in particular in cases where the result
168        is a non-match for a non-anchored pattern. For example, if
169        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
170        "m", where previously it did not return a name. A side effect of this
171        change is that for partial matches, the last encountered mark name is
172        returned, as for non matches. A number of tests that were previously not
173        Perl-compatible have been moved into the Perl-compatible test files. The
174        refactoring has had the pleasing side effect of removing one argument from
175        the match() function, thus reducing its stack requirements.
177    19. If the /S+ option was used in pcretest to study a pattern using JIT,
178        subsequent uses of /S (without +) incorrectly behaved like /S+.
180    21. Retrieve executable code size support for the JIT compiler and fixing
181        some warnings.
183    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
184        not work when the shorter character appeared right at the end of the
185        subject string.
187    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
188        systems.
190    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
191        output it when the /M option is used in pcretest.
193    25. The CheckMan script was not being included in the distribution. Also, added
194        an explicit "perl" to run Perl scripts from the PrepareRelease script
195        because this is reportedly needed in Windows.
197    26. If study data was being save in a file and studying had not found a set of
198        "starts with" bytes for the pattern, the data written to the file (though
199        never used) was taken from uninitialized memory and so caused valgrind to
200        complain.
202    27. Updated RunTest.bat as provided by Sheri Pierce.
204    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
206    29. Computation of memory usage for the table of capturing group names was
207        giving an unnecessarily large value.
210  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
211  ------------------------  ------------------------

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