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revision 733 by ph10, Tue Oct 11 10:29:36 2011 UTC revision 925 by ph10, Wed Feb 22 14:24:56 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.20 10-Oct-2011  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.  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.
42    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
43        or /S+[+] with a digit between 1 and 7.
45    8.  OP_NOT now supports any UTF character not just single-byte ones.
48    Version 8.30 04-February-2012
49    -----------------------------
51    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
52        name is defined in ctype.h.
54    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
55        only in quite long subpatterns.
57    3.  Removed the function pcre_info(), which has been obsolete and deprecated
58        since it was replaced by pcre_fullinfo() in February 2000.
60    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
61        match a (*MARK), and the match failed at the start of the subject, a
62        reference to memory before the start of the subject could occur. This bug
63        was introduced by fix 17 of release 8.21.
65    5.  A reference to an unset group with zero minimum repetition was giving
66        totally wrong answers (in non-JavaScript-compatibility mode). For example,
67        /(another)?(\1?)test/ matched against "hello world test". This bug was
68        introduced in release 8.13.
70    6.  Add support for 16-bit character strings (a large amount of work involving
71        many changes and refactorings).
73    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
74        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
75        from a file.
77    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
78        rounding is not applied in this particular case).
80    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
81        if they appear, or are escaped, in patterns.
83    10. Get rid of a number of -Wunused-but-set-variable warnings.
85    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
86        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
87        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
88        also returns the mark "x". This bug applied to capturing parentheses,
89        non-capturing parentheses, and atomic parentheses. It also applied to some
90        assertions.
92    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
93        information out of configure.ac instead of relying on pcre.h.generic, which
94        is not stored in the repository.
96    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
97        -lreadline.
99    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
101    15. Applied Graycode's patch to put the top-level frame on the stack rather
102        than the heap when not using the stack for recursion. This gives a
103        performance improvement in many cases when recursion is not deep.
105    16. Experimental code added to "pcretest -C" to output the stack frame size.
108    Version 8.21 12-Dec-2011
109    ------------------------
111    1.  Updating the JIT compiler.
113    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
114        are added as well.
116    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
117        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
118        calling _pcre_jit_exec. Some extra comments are added.
120    4.  (*MARK) settings inside atomic groups that do not contain any capturing
121        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
122        was introduced by change 18 for 8.20.
124    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
125        ECMA-262 standard.
127    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
128        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
129        This bug was probably introduced by change 9 of 8.13.
131    7.  While fixing 6 above, I noticed that a number of other items were being
132        incorrectly rejected as "not fixed length". This arose partly because newer
133        opcodes had not been added to the fixed-length checking code. I have (a)
134        corrected the bug and added tests for these items, and (b) arranged for an
135        error to occur if an unknown opcode is encountered while checking for fixed
136        length instead of just assuming "not fixed length". The items that were
137        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
138        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
139        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
141    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
142        being incorrectly compiled and would have given unpredicatble results.
144    9.  A possessively repeated subpattern with minimum repeat count greater than
145        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
146        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
147        the first (A) could occur when it should not.
149    10. Add a cast and remove a redundant test from the code.
151    11. JIT should use pcre_malloc/pcre_free for allocation.
153    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
154        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
155        is anything other than /usr, -L is still shown).
157    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
159    14. Perl does not support \N without a following name in a [] class; PCRE now
160        also gives an error.
162    15. If a forward reference was repeated with an upper limit of around 2000,
163        it caused the error "internal error: overran compiling workspace". The
164        maximum number of forward references (including repeats) was limited by the
165        internal workspace, and dependent on the LINK_SIZE. The code has been
166        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
167        the default depends on LINK_SIZE. There is a new upper limit (for safety)
168        of around 200,000 forward references. While doing this, I also speeded up
169        the filling in of repeated forward references.
171    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
172        incorrectly expecting the subject to contain another "a" after the start.
174    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
175        in the match, the SKIP should be ignored. This was not happening; instead
176        the SKIP was being treated as NOMATCH. For patterns such as
177        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
178        tested.
180    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
181        now much more compatible with Perl, in particular in cases where the result
182        is a non-match for a non-anchored pattern. For example, if
183        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
184        "m", where previously it did not return a name. A side effect of this
185        change is that for partial matches, the last encountered mark name is
186        returned, as for non matches. A number of tests that were previously not
187        Perl-compatible have been moved into the Perl-compatible test files. The
188        refactoring has had the pleasing side effect of removing one argument from
189        the match() function, thus reducing its stack requirements.
191    19. If the /S+ option was used in pcretest to study a pattern using JIT,
192        subsequent uses of /S (without +) incorrectly behaved like /S+.
194    21. Retrieve executable code size support for the JIT compiler and fixing
195        some warnings.
197    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
198        not work when the shorter character appeared right at the end of the
199        subject string.
201    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
202        systems.
204    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
205        output it when the /M option is used in pcretest.
207    25. The CheckMan script was not being included in the distribution. Also, added
208        an explicit "perl" to run Perl scripts from the PrepareRelease script
209        because this is reportedly needed in Windows.
211    26. If study data was being save in a file and studying had not found a set of
212        "starts with" bytes for the pattern, the data written to the file (though
213        never used) was taken from uninitialized memory and so caused valgrind to
214        complain.
216    27. Updated RunTest.bat as provided by Sheri Pierce.
218    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
220    29. Computation of memory usage for the table of capturing group names was
221        giving an unnecessarily large value.
224    Version 8.20 21-Oct-2011
225  ------------------------  ------------------------
227  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had  1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
# Line 68  Version 8.20 10-Oct-2011 Line 288  Version 8.20 10-Oct-2011
289  12. In some environments, the output of pcretest -C is CRLF terminated. This  12. In some environments, the output of pcretest -C is CRLF terminated. This
290      broke RunTest's code that checks for the link size. A single white space      broke RunTest's code that checks for the link size. A single white space
291      after the value is now allowed for.      character after the value is now allowed for.
293  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".  13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
294      For "fr", it uses the Windows-specific input and output files.      For "fr", it uses the Windows-specific input and output files.
# Line 104  Version 8.20 10-Oct-2011 Line 324  Version 8.20 10-Oct-2011
324      suppress the check for a minimum subject length at run time. (If it was      suppress the check for a minimum subject length at run time. (If it was
325      given to pcre_exec() or pcre_dfa_exec() it did work.)      given to pcre_exec() or pcre_dfa_exec() it did work.)
327    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
328        fail to work when decoding hex characters in data strings in EBCDIC
329        environments.
331    21. It appears that in at least one Mac OS environment, the isxdigit() function
332        is implemented as a macro that evaluates to its argument more than once,
333        contravening the C 90 Standard (I haven't checked a later standard). There
334        was an instance in pcretest which caused it to go wrong when processing
335        \x{...} escapes in subject strings. The has been rewritten to avoid using
336        things like p++ in the argument of isxdigit().
339  Version 8.13 16-Aug-2011  Version 8.13 16-Aug-2011
340  ------------------------  ------------------------

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