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revision 742 by zherczeg, Sun Nov 6 08:05:33 2011 UTC revision 960 by ph10, Thu Apr 19 17:30:38 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21  Version 8.31
5  ------------  -----------------------------
6    
7    1.  Fixing a wrong JIT test case and some compiler warnings.
8    
9    2.  Removed a bashism from the RunTest script.
10    
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)".
14    
15    4.  Partial matching support is added to the JIT compiler.
16    
17    5.  Fixed several bugs concerned with partial matching of items that consist
18        of more than one character:
19    
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.
23    
24        (b) \R did not give a hard partial match if \r was found at the end of the
25            subject.
26    
27        (c) \X did not give a hard partial match after matching one or more
28            characters at the end of the subject.
29    
30        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
31            a partial match for the string "\r".
32    
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.
35    
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.
39    
40    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
41        or /S+[+] with a digit between 1 and 7.
42    
43    8.  OP_NOT now supports any UTF character not just single-byte ones.
44    
45    9.  (*MARK) control verb is now supported by the JIT compiler.
46    
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.)
49    
50    11. Add PCRE_INFO_MAXLOOKBEHIND.
51    
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.
57    
58    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
59        call.
60    
61    14. As documented, (*COMMIT) is now confined to within a positive assertion.
62    
63    15. It is now possible to link pcretest with libedit as an alternative to
64        libreadline.
65    
66    16. (*COMMIT) control verb is now supported by the JIT compiler.
67    
68    17. The Unicode data tables have been updated to Unicode 6.1.0.
69    
70    18. Added --file-list option to pcregrep.
71    
72    19. Added binary file support to pcregrep, including the -a, --binary-files,
73        -I, and --text options.
74    
75    20. The madvise function is renamed for posix_madvise for QNX compatibility
76        reasons. Fixed by Giuseppe D'Angelo.
77    
78    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
79    
80    22. Changed the option for creating symbolic links for 16-bit man pages from
81        -s to -sf so that re-installing does not cause issues.
82    
83    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
84    
85    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
86        matches in certain environments (the workspace was not being correctly
87        retained). Also added to pcre_dfa_exec() a simple plausibility check on
88        some of the workspace data at the beginning of a restart.
89    
90    
91    Version 8.30 04-February-2012
92    -----------------------------
93    
94    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
95        name is defined in ctype.h.
96    
97    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
98        only in quite long subpatterns.
99    
100    3.  Removed the function pcre_info(), which has been obsolete and deprecated
101        since it was replaced by pcre_fullinfo() in February 2000.
102    
103    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
104        match a (*MARK), and the match failed at the start of the subject, a
105        reference to memory before the start of the subject could occur. This bug
106        was introduced by fix 17 of release 8.21.
107    
108    5.  A reference to an unset group with zero minimum repetition was giving
109        totally wrong answers (in non-JavaScript-compatibility mode). For example,
110        /(another)?(\1?)test/ matched against "hello world test". This bug was
111        introduced in release 8.13.
112    
113    6.  Add support for 16-bit character strings (a large amount of work involving
114        many changes and refactorings).
115    
116    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
117        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
118        from a file.
119    
120    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
121        rounding is not applied in this particular case).
122    
123    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
124        if they appear, or are escaped, in patterns.
125    
126    10. Get rid of a number of -Wunused-but-set-variable warnings.
127    
128    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
129        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
130        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
131        also returns the mark "x". This bug applied to capturing parentheses,
132        non-capturing parentheses, and atomic parentheses. It also applied to some
133        assertions.
134    
135    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
136        information out of configure.ac instead of relying on pcre.h.generic, which
137        is not stored in the repository.
138    
139    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
140        -lreadline.
141    
142    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
143    
144    15. Applied Graycode's patch to put the top-level frame on the stack rather
145        than the heap when not using the stack for recursion. This gives a
146        performance improvement in many cases when recursion is not deep.
147    
148    16. Experimental code added to "pcretest -C" to output the stack frame size.
149    
150    
151    Version 8.21 12-Dec-2011
152    ------------------------
153    
154  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
155    
# Line 13  Version 8.21 Line 160  Version 8.21
160      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
161      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
162    
163    4.  (*MARK) settings inside atomic groups that do not contain any capturing
164        parentheses, for example, (?>a(*:m)), were not being passed out. This bug
165        was introduced by change 18 for 8.20.
166    
167    5.  Supporting of \x, \U and \u in JavaScript compatibility mode based on the
168        ECMA-262 standard.
169    
170    6.  Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were
171        erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
172        This bug was probably introduced by change 9 of 8.13.
173    
174    7.  While fixing 6 above, I noticed that a number of other items were being
175        incorrectly rejected as "not fixed length". This arose partly because newer
176        opcodes had not been added to the fixed-length checking code. I have (a)
177        corrected the bug and added tests for these items, and (b) arranged for an
178        error to occur if an unknown opcode is encountered while checking for fixed
179        length instead of just assuming "not fixed length". The items that were
180        rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
181        (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
182        repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
183    
184    8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
185        being incorrectly compiled and would have given unpredicatble results.
186    
187    9.  A possessively repeated subpattern with minimum repeat count greater than
188        one behaved incorrectly. For example, (A){2,}+ behaved as if it was
189        (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
190        the first (A) could occur when it should not.
191    
192    10. Add a cast and remove a redundant test from the code.
193    
194    11. JIT should use pcre_malloc/pcre_free for allocation.
195    
196    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
197        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
198        is anything other than /usr, -L is still shown).
199    
200    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
201    
202    14. Perl does not support \N without a following name in a [] class; PCRE now
203        also gives an error.
204    
205    15. If a forward reference was repeated with an upper limit of around 2000,
206        it caused the error "internal error: overran compiling workspace". The
207        maximum number of forward references (including repeats) was limited by the
208        internal workspace, and dependent on the LINK_SIZE. The code has been
209        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
210        the default depends on LINK_SIZE. There is a new upper limit (for safety)
211        of around 200,000 forward references. While doing this, I also speeded up
212        the filling in of repeated forward references.
213    
214    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
215        incorrectly expecting the subject to contain another "a" after the start.
216    
217    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
218        in the match, the SKIP should be ignored. This was not happening; instead
219        the SKIP was being treated as NOMATCH. For patterns such as
220        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
221        tested.
222    
223    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
224        now much more compatible with Perl, in particular in cases where the result
225        is a non-match for a non-anchored pattern. For example, if
226        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
227        "m", where previously it did not return a name. A side effect of this
228        change is that for partial matches, the last encountered mark name is
229        returned, as for non matches. A number of tests that were previously not
230        Perl-compatible have been moved into the Perl-compatible test files. The
231        refactoring has had the pleasing side effect of removing one argument from
232        the match() function, thus reducing its stack requirements.
233    
234    19. If the /S+ option was used in pcretest to study a pattern using JIT,
235        subsequent uses of /S (without +) incorrectly behaved like /S+.
236    
237    21. Retrieve executable code size support for the JIT compiler and fixing
238        some warnings.
239    
240    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
241        not work when the shorter character appeared right at the end of the
242        subject string.
243    
244    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
245        systems.
246    
247    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
248        output it when the /M option is used in pcretest.
249    
250    25. The CheckMan script was not being included in the distribution. Also, added
251        an explicit "perl" to run Perl scripts from the PrepareRelease script
252        because this is reportedly needed in Windows.
253    
254    26. If study data was being save in a file and studying had not found a set of
255        "starts with" bytes for the pattern, the data written to the file (though
256        never used) was taken from uninitialized memory and so caused valgrind to
257        complain.
258    
259    27. Updated RunTest.bat as provided by Sheri Pierce.
260    
261    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
262    
263    29. Computation of memory usage for the table of capturing group names was
264        giving an unnecessarily large value.
265    
266    
267  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
268  ------------------------  ------------------------

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