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revision 654 by ph10, Tue Aug 2 11:00:40 2011 UTC revision 909 by ph10, Sat Feb 4 15:01:47 2012 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.13 02-Aug-2011  Version 8.30 04-February-2012
5    -----------------------------
7    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
8        name is defined in ctype.h.
10    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
11        only in quite long subpatterns.
13    3.  Removed the function pcre_info(), which has been obsolete and deprecated
14        since it was replaced by pcre_fullinfo() in February 2000.
16    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
17        match a (*MARK), and the match failed at the start of the subject, a
18        reference to memory before the start of the subject could occur. This bug
19        was introduced by fix 17 of release 8.21.
21    5.  A reference to an unset group with zero minimum repetition was giving
22        totally wrong answers (in non-JavaScript-compatibility mode). For example,
23        /(another)?(\1?)test/ matched against "hello world test". This bug was
24        introduced in release 8.13.
26    6.  Add support for 16-bit character strings (a large amount of work involving
27        many changes and refactorings).
29    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
30        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
31        from a file.
33    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
34        rounding is not applied in this particular case).
36    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
37        if they appear, or are escaped, in patterns.
39    10. Get rid of a number of -Wunused-but-set-variable warnings.
41    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
42        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
43        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
44        also returns the mark "x". This bug applied to capturing parentheses,
45        non-capturing parentheses, and atomic parentheses. It also applied to some
46        assertions.
48    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
49        information out of configure.ac instead of relying on pcre.h.generic, which
50        is not stored in the repository.
52    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
53        -lreadline.
55    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
57    15. Applied Graycode's patch to put the top-level frame on the stack rather
58        than the heap when not using the stack for recursion. This gives a
59        performance improvement in many cases when recursion is not deep.
61    16. Experimental code added to "pcretest -C" to output the stack frame size.
64    Version 8.21 12-Dec-2011
65    ------------------------
67    1.  Updating the JIT compiler.
69    2.  JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases
70        are added as well.
72    3.  Fix cache-flush issue on PowerPC (It is still an experimental JIT port).
73        PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before
74        calling _pcre_jit_exec. Some extra comments are added.
76    4.  (*MARK) settings inside atomic groups that do not contain any capturing
77        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
78        was introduced by change 18 for 8.20.
80    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
81        ECMA-262 standard.
83    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
84        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
85        This bug was probably introduced by change 9 of 8.13.
87    7.  While fixing 6 above, I noticed that a number of other items were being
88        incorrectly rejected as "not fixed length". This arose partly because newer
89        opcodes had not been added to the fixed-length checking code. I have (a)
90        corrected the bug and added tests for these items, and (b) arranged for an
91        error to occur if an unknown opcode is encountered while checking for fixed
92        length instead of just assuming "not fixed length". The items that were
93        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
94        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
95        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
97    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
98        being incorrectly compiled and would have given unpredicatble results.
100    9.  A possessively repeated subpattern with minimum repeat count greater than
101        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
102        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
103        the first (A) could occur when it should not.
105    10. Add a cast and remove a redundant test from the code.
107    11. JIT should use pcre_malloc/pcre_free for allocation.
109    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
110        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
111        is anything other than /usr, -L is still shown).
113    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
115    14. Perl does not support \N without a following name in a [] class; PCRE now
116        also gives an error.
118    15. If a forward reference was repeated with an upper limit of around 2000,
119        it caused the error "internal error: overran compiling workspace". The
120        maximum number of forward references (including repeats) was limited by the
121        internal workspace, and dependent on the LINK_SIZE. The code has been
122        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
123        the default depends on LINK_SIZE. There is a new upper limit (for safety)
124        of around 200,000 forward references. While doing this, I also speeded up
125        the filling in of repeated forward references.
127    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
128        incorrectly expecting the subject to contain another "a" after the start.
130    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
131        in the match, the SKIP should be ignored. This was not happening; instead
132        the SKIP was being treated as NOMATCH. For patterns such as
133        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
134        tested.
136    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
137        now much more compatible with Perl, in particular in cases where the result
138        is a non-match for a non-anchored pattern. For example, if
139        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
140        "m", where previously it did not return a name. A side effect of this
141        change is that for partial matches, the last encountered mark name is
142        returned, as for non matches. A number of tests that were previously not
143        Perl-compatible have been moved into the Perl-compatible test files. The
144        refactoring has had the pleasing side effect of removing one argument from
145        the match() function, thus reducing its stack requirements.
147    19. If the /S+ option was used in pcretest to study a pattern using JIT,
148        subsequent uses of /S (without +) incorrectly behaved like /S+.
150    21. Retrieve executable code size support for the JIT compiler and fixing
151        some warnings.
153    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
154        not work when the shorter character appeared right at the end of the
155        subject string.
157    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
158        systems.
160    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
161        output it when the /M option is used in pcretest.
163    25. The CheckMan script was not being included in the distribution. Also, added
164        an explicit "perl" to run Perl scripts from the PrepareRelease script
165        because this is reportedly needed in Windows.
167    26. If study data was being save in a file and studying had not found a set of
168        "starts with" bytes for the pattern, the data written to the file (though
169        never used) was taken from uninitialized memory and so caused valgrind to
170        complain.
172    27. Updated RunTest.bat as provided by Sheri Pierce.
174    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
176    29. Computation of memory usage for the table of capturing group names was
177        giving an unnecessarily large value.
180    Version 8.20 21-Oct-2011
181    ------------------------
183    1.  Change 37 of 8.13 broke patterns like [:a]...[b:] because it thought it had
184        a POSIX class. After further experiments with Perl, which convinced me that
185        Perl has bugs and confusions, a closing square bracket is no longer allowed
186        in a POSIX name. This bug also affected patterns with classes that started
187        with full stops.
189    2.  If a pattern such as /(a)b|ac/ is matched against "ac", there is no
190        captured substring, but while checking the failing first alternative,
191        substring 1 is temporarily captured. If the output vector supplied to
192        pcre_exec() was not big enough for this capture, the yield of the function
193        was still zero ("insufficient space for captured substrings"). This cannot
194        be totally fixed without adding another stack variable, which seems a lot
195        of expense for a edge case. However, I have improved the situation in cases
196        such as /(a)(b)x|abc/ matched against "abc", where the return code
197        indicates that fewer than the maximum number of slots in the ovector have
198        been set.
200    3.  Related to (2) above: when there are more back references in a pattern than
201        slots in the output vector, pcre_exec() uses temporary memory during
202        matching, and copies in the captures as far as possible afterwards. It was
203        using the entire output vector, but this conflicts with the specification
204        that only 2/3 is used for passing back captured substrings. Now it uses
205        only the first 2/3, for compatibility. This is, of course, another edge
206        case.
208    4.  Zoltan Herczeg's just-in-time compiler support has been integrated into the
209        main code base, and can be used by building with --enable-jit. When this is
210        done, pcregrep automatically uses it unless --disable-pcregrep-jit or the
211        runtime --no-jit option is given.
213    5.  When the number of matches in a pcre_dfa_exec() run exactly filled the
214        ovector, the return from the function was zero, implying that there were
215        other matches that did not fit. The correct "exactly full" value is now
216        returned.
218    6.  If a subpattern that was called recursively or as a subroutine contained
219        (*PRUNE) or any other control that caused it to give a non-standard return,
220        invalid errors such as "Error -26 (nested recursion at the same subject
221        position)" or even infinite loops could occur.
223    7.  If a pattern such as /a(*SKIP)c|b(*ACCEPT)|/ was studied, it stopped
224        computing the minimum length on reaching *ACCEPT, and so ended up with the
225        wrong value of 1 rather than 0. Further investigation indicates that
226        computing a minimum subject length in the presence of *ACCEPT is difficult
227        (think back references, subroutine calls), and so I have changed the code
228        so that no minimum is registered for a pattern that contains *ACCEPT.
230    8.  If (*THEN) was present in the first (true) branch of a conditional group,
231        it was not handled as intended. [But see 16 below.]
233    9.  Replaced RunTest.bat and CMakeLists.txt with improved versions provided by
234        Sheri Pierce.
236    10. A pathological pattern such as /(*ACCEPT)a/ was miscompiled, thinking that
237        the first byte in a match must be "a".
239    11. Change 17 for 8.13 increased the recursion depth for patterns like
240        /a(?:.)*?a/ drastically. I've improved things by remembering whether a
241        pattern contains any instances of (*THEN). If it does not, the old
242        optimizations are restored. It would be nice to do this on a per-group
243        basis, but at the moment that is not feasible.
245    12. In some environments, the output of pcretest -C is CRLF terminated. This
246        broke RunTest's code that checks for the link size. A single white space
247        character after the value is now allowed for.
249    13. RunTest now checks for the "fr" locale as well as for "fr_FR" and "french".
250        For "fr", it uses the Windows-specific input and output files.
252    14. If (*THEN) appeared in a group that was called recursively or as a
253        subroutine, it did not work as intended. [But see next item.]
255    15. Consider the pattern /A (B(*THEN)C) | D/ where A, B, C, and D are complex
256        pattern fragments (but not containing any | characters). If A and B are
257        matched, but there is a failure in C so that it backtracks to (*THEN), PCRE
258        was behaving differently to Perl. PCRE backtracked into A, but Perl goes to
259        D. In other words, Perl considers parentheses that do not contain any |
260        characters to be part of a surrounding alternative, whereas PCRE was
261        treading (B(*THEN)C) the same as (B(*THEN)C|(*FAIL)) -- which Perl handles
262        differently. PCRE now behaves in the same way as Perl, except in the case
263        of subroutine/recursion calls such as (?1) which have in any case always
264        been different (but PCRE had them first :-).
266    16. Related to 15 above: Perl does not treat the | in a conditional group as
267        creating alternatives. Such a group is treated in the same way as an
268        ordinary group without any | characters when processing (*THEN). PCRE has
269        been changed to match Perl's behaviour.
271    17. If a user had set PCREGREP_COLO(U)R to something other than 1:31, the
272        RunGrepTest script failed.
274    18. Change 22 for version 13 caused atomic groups to use more stack. This is
275        inevitable for groups that contain captures, but it can lead to a lot of
276        stack use in large patterns. The old behaviour has been restored for atomic
277        groups that do not contain any capturing parentheses.
279    19. If the PCRE_NO_START_OPTIMIZE option was set for pcre_compile(), it did not
280        suppress the check for a minimum subject length at run time. (If it was
281        given to pcre_exec() or pcre_dfa_exec() it did work.)
283    20. Fixed an ASCII-dependent infelicity in pcretest that would have made it
284        fail to work when decoding hex characters in data strings in EBCDIC
285        environments.
287    21. It appears that in at least one Mac OS environment, the isxdigit() function
288        is implemented as a macro that evaluates to its argument more than once,
289        contravening the C 90 Standard (I haven't checked a later standard). There
290        was an instance in pcretest which caused it to go wrong when processing
291        \x{...} escapes in subject strings. The has been rewritten to avoid using
292        things like p++ in the argument of isxdigit().
295    Version 8.13 16-Aug-2011
296  ------------------------  ------------------------
298  1.  The Unicode data tables have been updated to Unicode 6.0.0.  1.  The Unicode data tables have been updated to Unicode 6.0.0.
# Line 98  Version 8.13 02-Aug-2011 Line 389  Version 8.13 02-Aug-2011
389      tail recursion to cut down on stack usage. Unfortunately, now that there is      tail recursion to cut down on stack usage. Unfortunately, now that there is
390      the possibility of (*THEN) occurring in these branches, tail recursion is      the possibility of (*THEN) occurring in these branches, tail recursion is
391      no longer possible because the return has to be checked for (*THEN). These      no longer possible because the return has to be checked for (*THEN). These
392      two optimizations have therefore been removed.      two optimizations have therefore been removed. [But see 8.20/11 above.]
394  18. If a pattern containing \R was studied, it was assumed that \R always  18. If a pattern containing \R was studied, it was assumed that \R always
395      matched two bytes, thus causing the minimum subject length to be      matched two bytes, thus causing the minimum subject length to be
# Line 189  Version 8.13 02-Aug-2011 Line 480  Version 8.13 02-Aug-2011
480      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,      For example, [:a[:digit:]b:] matches "a", "b", ":", or a digit. Also,
481      unescaped square brackets may also appear as part of class names. For      unescaped square brackets may also appear as part of class names. For
482      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves      example, [:a[:abc]b:] gives unknown class "[:abc]b:]". PCRE now behaves
483      more like Perl.      more like Perl. (But see 8.20/1 above.)
485  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this  38. PCRE was giving an error for \N with a braced quantifier such as {1,} (this
486      was because it thought it was \N{name}, which is not supported).      was because it thought it was \N{name}, which is not supported).
# Line 224  Version 8.13 02-Aug-2011 Line 515  Version 8.13 02-Aug-2011
515      (a) The default value of the buffer size parameter has been increased from      (a) The default value of the buffer size parameter has been increased from
516          8K to 20K. (The actual buffer used is three times this size.)          8K to 20K. (The actual buffer used is three times this size.)
518      (b) The default can be changed by ./configure --with-pcregrep-bufsiz when      (b) The default can be changed by ./configure --with-pcregrep-bufsize when
519          PCRE is built.          PCRE is built.
521      (c) A --buffer-size=n option has been added to pcregrep, to allow the size      (c) A --buffer-size=n option has been added to pcregrep, to allow the size
# Line 246  Version 8.13 02-Aug-2011 Line 537  Version 8.13 02-Aug-2011
537      complete match instead of a partial match. This bug was dependent on both      complete match instead of a partial match. This bug was dependent on both
538      the PCRE_UTF8 and PCRE_DOTALL options being set.      the PCRE_UTF8 and PCRE_DOTALL options being set.
540    48. For a pattern such as /\babc|\bdef/ pcre_study() was failing to set up the
541        starting byte set, because \b was not being ignored.
544  Version 8.12 15-Jan-2011  Version 8.12 15-Jan-2011
545  ------------------------  ------------------------

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