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revision 746 by ph10, Tue Nov 15 15:07:02 2011 UTC revision 933 by ph10, Sat Feb 25 12:18:23 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 recognize
31            a partial match for the string "\r".
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.
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.
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
45    9.  (*MARK) control verb is now supported by the JIT compiler.
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.)
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.
59    Version 8.30 04-February-2012
60    -----------------------------
62    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
63        name is defined in ctype.h.
65    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
66        only in quite long subpatterns.
68    3.  Removed the function pcre_info(), which has been obsolete and deprecated
69        since it was replaced by pcre_fullinfo() in February 2000.
71    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
72        match a (*MARK), and the match failed at the start of the subject, a
73        reference to memory before the start of the subject could occur. This bug
74        was introduced by fix 17 of release 8.21.
76    5.  A reference to an unset group with zero minimum repetition was giving
77        totally wrong answers (in non-JavaScript-compatibility mode). For example,
78        /(another)?(\1?)test/ matched against "hello world test". This bug was
79        introduced in release 8.13.
81    6.  Add support for 16-bit character strings (a large amount of work involving
82        many changes and refactorings).
84    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
85        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
86        from a file.
88    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
89        rounding is not applied in this particular case).
91    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
92        if they appear, or are escaped, in patterns.
94    10. Get rid of a number of -Wunused-but-set-variable warnings.
96    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
97        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
98        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
99        also returns the mark "x". This bug applied to capturing parentheses,
100        non-capturing parentheses, and atomic parentheses. It also applied to some
101        assertions.
103    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
104        information out of configure.ac instead of relying on pcre.h.generic, which
105        is not stored in the repository.
107    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
108        -lreadline.
110    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
112    15. Applied Graycode's patch to put the top-level frame on the stack rather
113        than the heap when not using the stack for recursion. This gives a
114        performance improvement in many cases when recursion is not deep.
116    16. Experimental code added to "pcretest -C" to output the stack frame size.
119    Version 8.21 12-Dec-2011
120    ------------------------
122  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 13  Version 8.21 Line 128  Version 8.21
128      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before      PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
129      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
131  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
132      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
133      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
# Line 22  Version 8.21 Line 137  Version 8.21
138  6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were  6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
139      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
140      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
142    7.  While fixing 6 above, I noticed that a number of other items were being
143        incorrectly rejected as "not fixed length". This arose partly because newer
144        opcodes had not been added to the fixed-length checking code. I have (a)
145        corrected the bug and added tests for these items, and (b) arranged for an
146        error to occur if an unknown opcode is encountered while checking for fixed
147        length instead of just assuming "not fixed length". The items that were
148        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
149        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
150        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
152    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
153        being incorrectly compiled and would have given unpredicatble results.
155    9.  A possessively repeated subpattern with minimum repeat count greater than
156        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
157        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
158        the first (A) could occur when it should not.
160    10. Add a cast and remove a redundant test from the code.
162    11. JIT should use pcre_malloc/pcre_free for allocation.
164    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
165        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
166        is anything other than /usr, -L is still shown).
168    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
170    14. Perl does not support \N without a following name in a [] class; PCRE now
171        also gives an error.
173    15. If a forward reference was repeated with an upper limit of around 2000,
174        it caused the error "internal error: overran compiling workspace". The
175        maximum number of forward references (including repeats) was limited by the
176        internal workspace, and dependent on the LINK_SIZE. The code has been
177        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
178        the default depends on LINK_SIZE. There is a new upper limit (for safety)
179        of around 200,000 forward references. While doing this, I also speeded up
180        the filling in of repeated forward references.
182    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
183        incorrectly expecting the subject to contain another "a" after the start.
185    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
186        in the match, the SKIP should be ignored. This was not happening; instead
187        the SKIP was being treated as NOMATCH. For patterns such as
188        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
189        tested.
191    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
192        now much more compatible with Perl, in particular in cases where the result
193        is a non-match for a non-anchored pattern. For example, if
194        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
195        "m", where previously it did not return a name. A side effect of this
196        change is that for partial matches, the last encountered mark name is
197        returned, as for non matches. A number of tests that were previously not
198        Perl-compatible have been moved into the Perl-compatible test files. The
199        refactoring has had the pleasing side effect of removing one argument from
200        the match() function, thus reducing its stack requirements.
202    19. If the /S+ option was used in pcretest to study a pattern using JIT,
203        subsequent uses of /S (without +) incorrectly behaved like /S+.
205    21. Retrieve executable code size support for the JIT compiler and fixing
206        some warnings.
208    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
209        not work when the shorter character appeared right at the end of the
210        subject string.
212    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
213        systems.
215    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
216        output it when the /M option is used in pcretest.
218    25. The CheckMan script was not being included in the distribution. Also, added
219        an explicit "perl" to run Perl scripts from the PrepareRelease script
220        because this is reportedly needed in Windows.
222    26. If study data was being save in a file and studying had not found a set of
223        "starts with" bytes for the pattern, the data written to the file (though
224        never used) was taken from uninitialized memory and so caused valgrind to
225        complain.
227    27. Updated RunTest.bat as provided by Sheri Pierce.
229    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
231    29. Computation of memory usage for the table of capturing group names was
232        giving an unnecessarily large value.
235  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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