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revision 784 by ph10, Mon Dec 5 12:33:44 2011 UTC revision 915 by zherczeg, Tue Feb 14 13:05:39 2012 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.21 05-Dec-2011  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.  Improved \X and back reference partial matching.
18    
19    
20    Version 8.30 04-February-2012
21    -----------------------------
22    
23    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
24        name is defined in ctype.h.
25    
26    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
27        only in quite long subpatterns.
28    
29    3.  Removed the function pcre_info(), which has been obsolete and deprecated
30        since it was replaced by pcre_fullinfo() in February 2000.
31    
32    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
33        match a (*MARK), and the match failed at the start of the subject, a
34        reference to memory before the start of the subject could occur. This bug
35        was introduced by fix 17 of release 8.21.
36    
37    5.  A reference to an unset group with zero minimum repetition was giving
38        totally wrong answers (in non-JavaScript-compatibility mode). For example,
39        /(another)?(\1?)test/ matched against "hello world test". This bug was
40        introduced in release 8.13.
41    
42    6.  Add support for 16-bit character strings (a large amount of work involving
43        many changes and refactorings).
44    
45    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
46        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
47        from a file.
48    
49    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
50        rounding is not applied in this particular case).
51    
52    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
53        if they appear, or are escaped, in patterns.
54    
55    10. Get rid of a number of -Wunused-but-set-variable warnings.
56    
57    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
58        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
59        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
60        also returns the mark "x". This bug applied to capturing parentheses,
61        non-capturing parentheses, and atomic parentheses. It also applied to some
62        assertions.
63    
64    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
65        information out of configure.ac instead of relying on pcre.h.generic, which
66        is not stored in the repository.
67    
68    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
69        -lreadline.
70    
71    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
72    
73    15. Applied Graycode's patch to put the top-level frame on the stack rather
74        than the heap when not using the stack for recursion. This gives a
75        performance improvement in many cases when recursion is not deep.
76    
77    16. Experimental code added to "pcretest -C" to output the stack frame size.
78    
79    
80    Version 8.21 12-Dec-2011
81  ------------------------  ------------------------
82    
83  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
# Line 22  Version 8.21 05-Dec-2011 Line 98  Version 8.21 05-Dec-2011
98    
99  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
100      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
101      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
102    
103  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
104      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
105      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)
106      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
107      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
108      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
109      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
110      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
111      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
112    
113  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
114      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
115    
116  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
117      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
118      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
119      the first (A) could occur when it should not.      the first (A) could occur when it should not.
120    
121  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
122    
123  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
124    
125  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems  12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems
126      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
127      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
128    
129  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.  13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching.
130    
131  14. Perl does not support \N without a following name in a [] class; PCRE now  14. Perl does not support \N without a following name in a [] class; PCRE now
132      also gives an error.      also gives an error.
133    
134  15. If a forward reference was repeated with an upper limit of around 2000,  15. If a forward reference was repeated with an upper limit of around 2000,
135      it caused the error "internal error: overran compiling workspace". The      it caused the error "internal error: overran compiling workspace". The
136      maximum number of forward references (including repeats) was limited by the      maximum number of forward references (including repeats) was limited by the
137      internal workspace, and dependent on the LINK_SIZE. The code has been      internal workspace, and dependent on the LINK_SIZE. The code has been
138      rewritten so that the workspace expands (via pcre_malloc) if necessary, and      rewritten so that the workspace expands (via pcre_malloc) if necessary, and
139      the default depends on LINK_SIZE. There is a new upper limit (for safety)      the default depends on LINK_SIZE. There is a new upper limit (for safety)
140      of around 200,000 forward references. While doing this, I also speeded up      of around 200,000 forward references. While doing this, I also speeded up
141      the filling in of repeated forward references.      the filling in of repeated forward references.
142    
143  16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was  16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was
144      incorrectly expecting the subject to contain another "a" after the start.      incorrectly expecting the subject to contain another "a" after the start.
145    
146  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
147      in the match, the SKIP should be ignored. This was not happening; instead      in the match, the SKIP should be ignored. This was not happening; instead
148      the SKIP was being treated as NOMATCH. For patterns such as      the SKIP was being treated as NOMATCH. For patterns such as
149      /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never      /A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never
150      tested.      tested.
151    
152  18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is  18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is
153      now much more compatible with Perl, in particular in cases where the result      now much more compatible with Perl, in particular in cases where the result
154      is a non-match for a non-anchored pattern. For example, if      is a non-match for a non-anchored pattern. For example, if
155      /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name      /b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name
156      "m", where previously it did not return a name. A side effect of this      "m", where previously it did not return a name. A side effect of this
157      change is that for partial matches, the last encountered mark name is      change is that for partial matches, the last encountered mark name is
158      returned, as for non matches. A number of tests that were previously not      returned, as for non matches. A number of tests that were previously not
159      Perl-compatible have been moved into the Perl-compatible test files. The      Perl-compatible have been moved into the Perl-compatible test files. The
160      refactoring has had the pleasing side effect of removing one argument from      refactoring has had the pleasing side effect of removing one argument from
161      the match() function, thus reducing its stack requirements.      the match() function, thus reducing its stack requirements.
162    
163  19. If the /S+ option was used in pcretest to study a pattern using JIT,  19. If the /S+ option was used in pcretest to study a pattern using JIT,
164      subsequent uses of /S (without +) incorrectly behaved like /S+.      subsequent uses of /S (without +) incorrectly behaved like /S+.
165    
166  21. Retrieve executable code size support for the JIT compiler and fixing  21. Retrieve executable code size support for the JIT compiler and fixing
167      some warnings.      some warnings.
168    
169  22. A caseless match of a UTF-8 character whose other case uses fewer bytes did  22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
170      not work when the shorter character appeared right at the end of the      not work when the shorter character appeared right at the end of the
171      subject string.      subject string.
172    
173  23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit  23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
174      systems.      systems.
175    
176  24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also  24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
177      output it when the /M option is used in pcretest.      output it when the /M option is used in pcretest.
178    
179  25. The CheckMan script was not being included in the distribution. Also, added  25. The CheckMan script was not being included in the distribution. Also, added
180      an explicit "perl" to run Perl scripts from the PrepareRelease script      an explicit "perl" to run Perl scripts from the PrepareRelease script
181      because this is reportedly needed in Windows.      because this is reportedly needed in Windows.
182    
183    26. If study data was being save in a file and studying had not found a set of
184        "starts with" bytes for the pattern, the data written to the file (though
185        never used) was taken from uninitialized memory and so caused valgrind to
186        complain.
187    
188    27. Updated RunTest.bat as provided by Sheri Pierce.
189    
190    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
191    
192    29. Computation of memory usage for the table of capturing group names was
193        giving an unnecessarily large value.
194    
195    
196  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
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