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revision 751 by ph10, Fri Nov 18 11:13:30 2011 UTC revision 932 by ph10, Fri Feb 24 18:54:43 2012 UTC
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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    
53    Version 8.30 04-February-2012
54    -----------------------------
55    
56    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
57        name is defined in ctype.h.
58    
59    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
60        only in quite long subpatterns.
61    
62    3.  Removed the function pcre_info(), which has been obsolete and deprecated
63        since it was replaced by pcre_fullinfo() in February 2000.
64    
65    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
66        match a (*MARK), and the match failed at the start of the subject, a
67        reference to memory before the start of the subject could occur. This bug
68        was introduced by fix 17 of release 8.21.
69    
70    5.  A reference to an unset group with zero minimum repetition was giving
71        totally wrong answers (in non-JavaScript-compatibility mode). For example,
72        /(another)?(\1?)test/ matched against "hello world test". This bug was
73        introduced in release 8.13.
74    
75    6.  Add support for 16-bit character strings (a large amount of work involving
76        many changes and refactorings).
77    
78    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
79        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
80        from a file.
81    
82    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
83        rounding is not applied in this particular case).
84    
85    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
86        if they appear, or are escaped, in patterns.
87    
88    10. Get rid of a number of -Wunused-but-set-variable warnings.
89    
90    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
91        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
92        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
93        also returns the mark "x". This bug applied to capturing parentheses,
94        non-capturing parentheses, and atomic parentheses. It also applied to some
95        assertions.
96    
97    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
98        information out of configure.ac instead of relying on pcre.h.generic, which
99        is not stored in the repository.
100    
101    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
102        -lreadline.
103    
104    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
105    
106    15. Applied Graycode's patch to put the top-level frame on the stack rather
107        than the heap when not using the stack for recursion. This gives a
108        performance improvement in many cases when recursion is not deep.
109    
110    16. Experimental code added to "pcretest -C" to output the stack frame size.
111    
112    
113    Version 8.21 12-Dec-2011
114    ------------------------
115    
116  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
117    
# Line 13  Version 8.21 Line 122  Version 8.21
122      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
123      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
124    
125  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
126      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
127      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
128    
# Line 22  Version 8.21 Line 131  Version 8.21
131    
132  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
133      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
134      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
135    
136  7.  While fixing 6 above, I noticed that a number of other items were being  7.  While fixing 6 above, I noticed that a number of other items were being
137      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
138      opcodes had not been added to the fixed-length checking code. I have (a)      opcodes had not been added to the fixed-length checking code. I have (a)
139      corrected the bug and added tests for these items, and (b) arranged for an      corrected the bug and added tests for these items, and (b) arranged for an
140      error to occur if an unknown opcode is encountered while checking for fixed      error to occur if an unknown opcode is encountered while checking for fixed
141      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
142      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
143      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
144      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
145    
146  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
147      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
148    
149  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
150      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
151      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
152      the first (A) could occur when it should not.      the first (A) could occur when it should not.
153    
154  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
155    
156    11. JIT should use pcre_malloc/pcre_free for allocation.
157    
158    12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
159        best practice nowadays, and helps with cross-compiling. (If the exec_prefix
160        is anything other than /usr, -L is still shown).
161    
162    13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
163    
164    14. Perl does not support \N without a following name in a [] class; PCRE now
165        also gives an error.
166    
167    15. If a forward reference was repeated with an upper limit of around 2000,
168        it caused the error "internal error: overran compiling workspace". The
169        maximum number of forward references (including repeats) was limited by the
170        internal workspace, and dependent on the LINK_SIZE. The code has been
171        rewritten so that the workspace expands (via pcre_malloc) if necessary, and
172        the default depends on LINK_SIZE. There is a new upper limit (for safety)
173        of around 200,000 forward references. While doing this, I also speeded up
174        the filling in of repeated forward references.
175    
176    16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
177        incorrectly expecting the subject to contain another "a" after the start.
178    
179    17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
180        in the match, the SKIP should be ignored. This was not happening; instead
181        the SKIP was being treated as NOMATCH. For patterns such as
182        /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
183        tested.
184    
185    18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
186        now much more compatible with Perl, in particular in cases where the result
187        is a non-match for a non-anchored pattern. For example, if
188        /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
189        "m", where previously it did not return a name. A side effect of this
190        change is that for partial matches, the last encountered mark name is
191        returned, as for non matches. A number of tests that were previously not
192        Perl-compatible have been moved into the Perl-compatible test files. The
193        refactoring has had the pleasing side effect of removing one argument from
194        the match() function, thus reducing its stack requirements.
195    
196    19. If the /S+ option was used in pcretest to study a pattern using JIT,
197        subsequent uses of /S (without +) incorrectly behaved like /S+.
198    
199    21. Retrieve executable code size support for the JIT compiler and fixing
200        some warnings.
201    
202    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
203        not work when the shorter character appeared right at the end of the
204        subject string.
205    
206    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
207        systems.
208    
209    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
210        output it when the /M option is used in pcretest.
211    
212    25. The CheckMan script was not being included in the distribution. Also, added
213        an explicit "perl" to run Perl scripts from the PrepareRelease script
214        because this is reportedly needed in Windows.
215    
216    26. If study data was being save in a file and studying had not found a set of
217        "starts with" bytes for the pattern, the data written to the file (though
218        never used) was taken from uninitialized memory and so caused valgrind to
219        complain.
220    
221    27. Updated RunTest.bat as provided by Sheri Pierce.
222    
223    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
224    
225    29. Computation of memory usage for the table of capturing group names was
226        giving an unnecessarily large value.
227    
228    
229  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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