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revision 740 by zherczeg, Mon Oct 31 06:10:14 2011 UTC revision 914 by zherczeg, Mon Feb 13 06:04:50 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.
18    Version 8.30 04-February-2012
19    -----------------------------
21    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
22        name is defined in ctype.h.
24    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
25        only in quite long subpatterns.
27    3.  Removed the function pcre_info(), which has been obsolete and deprecated
28        since it was replaced by pcre_fullinfo() in February 2000.
30    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
31        match a (*MARK), and the match failed at the start of the subject, a
32        reference to memory before the start of the subject could occur. This bug
33        was introduced by fix 17 of release 8.21.
35    5.  A reference to an unset group with zero minimum repetition was giving
36        totally wrong answers (in non-JavaScript-compatibility mode). For example,
37        /(another)?(\1?)test/ matched against "hello world test". This bug was
38        introduced in release 8.13.
40    6.  Add support for 16-bit character strings (a large amount of work involving
41        many changes and refactorings).
43    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
44        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
45        from a file.
47    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
48        rounding is not applied in this particular case).
50    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
51        if they appear, or are escaped, in patterns.
53    10. Get rid of a number of -Wunused-but-set-variable warnings.
55    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
56        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
57        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
58        also returns the mark "x". This bug applied to capturing parentheses,
59        non-capturing parentheses, and atomic parentheses. It also applied to some
60        assertions.
62    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
63        information out of configure.ac instead of relying on pcre.h.generic, which
64        is not stored in the repository.
66    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
67        -lreadline.
69    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
71    15. Applied Graycode's patch to put the top-level frame on the stack rather
72        than the heap when not using the stack for recursion. This gives a
73        performance improvement in many cases when recursion is not deep.
75    16. Experimental code added to "pcretest -C" to output the stack frame size.
78    Version 8.21 12-Dec-2011
79    ------------------------
81  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
83    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
84        are added as well.
86    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
87        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
88        calling _pcre_jit_exec. Some extra comments are added.
90    4.  (*MARK) settings inside atomic groups that do not contain any capturing
91        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
92        was introduced by change 18 for 8.20.
94    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
95        ECMA-262 standard.
97    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
98        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
99        This bug was probably introduced by change 9 of 8.13.
101    7.  While fixing 6 above, I noticed that a number of other items were being
102        incorrectly rejected as "not fixed length". This arose partly because newer
103        opcodes had not been added to the fixed-length checking code. I have (a)
104        corrected the bug and added tests for these items, and (b) arranged for an
105        error to occur if an unknown opcode is encountered while checking for fixed
106        length instead of just assuming "not fixed length". The items that were
107        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
108        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
109        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
111    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
112        being incorrectly compiled and would have given unpredicatble results.
114    9.  A possessively repeated subpattern with minimum repeat count greater than
115        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
116        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
117        the first (A) could occur when it should not.
119    10. Add a cast and remove a redundant test from the code.
121    11. JIT should use pcre_malloc/pcre_free for allocation.
123    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
124        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
125        is anything other than /usr, -L is still shown).
127    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
129    14. Perl does not support \N without a following name in a [] class; PCRE now
130        also gives an error.
132    15. If a forward reference was repeated with an upper limit of around 2000,
133        it caused the error "internal error: overran compiling workspace". The
134        maximum number of forward references (including repeats) was limited by the
135        internal workspace, and dependent on the LINK_SIZE. The code has been
136        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
137        the default depends on LINK_SIZE. There is a new upper limit (for safety)
138        of around 200,000 forward references. While doing this, I also speeded up
139        the filling in of repeated forward references.
141    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
142        incorrectly expecting the subject to contain another "a" after the start.
144    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
145        in the match, the SKIP should be ignored. This was not happening; instead
146        the SKIP was being treated as NOMATCH. For patterns such as
147        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
148        tested.
150    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
151        now much more compatible with Perl, in particular in cases where the result
152        is a non-match for a non-anchored pattern. For example, if
153        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
154        "m", where previously it did not return a name. A side effect of this
155        change is that for partial matches, the last encountered mark name is
156        returned, as for non matches. A number of tests that were previously not
157        Perl-compatible have been moved into the Perl-compatible test files. The
158        refactoring has had the pleasing side effect of removing one argument from
159        the match() function, thus reducing its stack requirements.
161    19. If the /S+ option was used in pcretest to study a pattern using JIT,
162        subsequent uses of /S (without +) incorrectly behaved like /S+.
164    21. Retrieve executable code size support for the JIT compiler and fixing
165        some warnings.
167    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
168        not work when the shorter character appeared right at the end of the
169        subject string.
171    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
172        systems.
174    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
175        output it when the /M option is used in pcretest.
177    25. The CheckMan script was not being included in the distribution. Also, added
178        an explicit "perl" to run Perl scripts from the PrepareRelease script
179        because this is reportedly needed in Windows.
181    26. If study data was being save in a file and studying had not found a set of
182        "starts with" bytes for the pattern, the data written to the file (though
183        never used) was taken from uninitialized memory and so caused valgrind to
184        complain.
186    27. Updated RunTest.bat as provided by Sheri Pierce.
188    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
190    29. Computation of memory usage for the table of capturing group names was
191        giving an unnecessarily large value.
194  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
195  ------------------------  ------------------------

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