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revision 779 by ph10, Fri Dec 2 10:39:32 2011 UTC revision 931 by ph10, Fri Feb 24 13:21:02 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    
51    Version 8.30 04-February-2012
52    -----------------------------
53    
54    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
55        name is defined in ctype.h.
56    
57    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
58        only in quite long subpatterns.
59    
60    3.  Removed the function pcre_info(), which has been obsolete and deprecated
61        since it was replaced by pcre_fullinfo() in February 2000.
62    
63    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
64        match a (*MARK), and the match failed at the start of the subject, a
65        reference to memory before the start of the subject could occur. This bug
66        was introduced by fix 17 of release 8.21.
67    
68    5.  A reference to an unset group with zero minimum repetition was giving
69        totally wrong answers (in non-JavaScript-compatibility mode). For example,
70        /(another)?(\1?)test/ matched against "hello world test". This bug was
71        introduced in release 8.13.
72    
73    6.  Add support for 16-bit character strings (a large amount of work involving
74        many changes and refactorings).
75    
76    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
77        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
78        from a file.
79    
80    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
81        rounding is not applied in this particular case).
82    
83    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
84        if they appear, or are escaped, in patterns.
85    
86    10. Get rid of a number of -Wunused-but-set-variable warnings.
87    
88    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
89        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
90        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
91        also returns the mark "x". This bug applied to capturing parentheses,
92        non-capturing parentheses, and atomic parentheses. It also applied to some
93        assertions.
94    
95    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
96        information out of configure.ac instead of relying on pcre.h.generic, which
97        is not stored in the repository.
98    
99    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
100        -lreadline.
101    
102    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
103    
104    15. Applied Graycode's patch to put the top-level frame on the stack rather
105        than the heap when not using the stack for recursion. This gives a
106        performance improvement in many cases when recursion is not deep.
107    
108    16. Experimental code added to "pcretest -C" to output the stack frame size.
109    
110    
111    Version 8.21 12-Dec-2011
112    ------------------------
113    
114  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
115    
# Line 13  Version 8.21 Line 120  Version 8.21
120      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
121      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
122    
123  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
124      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
125      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
126    
# Line 22  Version 8.21 Line 129  Version 8.21
129    
130  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
131      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
132      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
133    
134  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
135      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
136      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)
137      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
138      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
139      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
140      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
141      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
142      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
143    
144  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
145      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
146    
147  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
148      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
149      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
150      the first (A) could occur when it should not.      the first (A) could occur when it should not.
151    
152  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
153    
154  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
155    
156  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
157      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
158      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
159    
160  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.
161    
162  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
163      also gives an error.      also gives an error.
164    
165  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,
166      it caused the error "internal error: overran compiling workspace". The      it caused the error "internal error: overran compiling workspace". The
167      maximum number of forward references (including repeats) was limited by the      maximum number of forward references (including repeats) was limited by the
168      internal workspace, and dependent on the LINK_SIZE. The code has been      internal workspace, and dependent on the LINK_SIZE. The code has been
169      rewritten so that the workspace expands (via pcre_malloc) if necessary, and      rewritten so that the workspace expands (via pcre_malloc) if necessary, and
170      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)
171      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
172      the filling in of repeated forward references.      the filling in of repeated forward references.
173    
174  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
175      incorrectly expecting the subject to contain another "a" after the start.      incorrectly expecting the subject to contain another "a" after the start.
176    
177  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
178      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
179      the SKIP was being treated as NOMATCH. For patterns such as      the SKIP was being treated as NOMATCH. For patterns such as
180      /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
181      tested.      tested.
182    
183  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
184      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
185      is a non-match for a non-anchored pattern. For example, if      is a non-match for a non-anchored pattern. For example, if
186      /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
187      "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
188      change is that for partial matches, the last encountered mark name is      change is that for partial matches, the last encountered mark name is
189      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
190      Perl-compatible have been moved into the Perl-compatible test files. The      Perl-compatible have been moved into the Perl-compatible test files. The
191      refactoring has had the pleasing side effect of removing one argument from      refactoring has had the pleasing side effect of removing one argument from
192      the match() function, thus reducing its stack requirements.      the match() function, thus reducing its stack requirements.
193    
194  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,
195      subsequent uses of /S (without +) incorrectly behaved like /S+.      subsequent uses of /S (without +) incorrectly behaved like /S+.
196    
197  21. Retrieve executable code size support for the JIT compiler and fixing  21. Retrieve executable code size support for the JIT compiler and fixing
198      some warnings.      some warnings.
199    
200  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
201      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
202      subject string.      subject string.
203    
204  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
205      systems.      systems.
206    
207    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
208        output it when the /M option is used in pcretest.
209    
210    25. The CheckMan script was not being included in the distribution. Also, added
211        an explicit "perl" to run Perl scripts from the PrepareRelease script
212        because this is reportedly needed in Windows.
213    
214    26. If study data was being save in a file and studying had not found a set of
215        "starts with" bytes for the pattern, the data written to the file (though
216        never used) was taken from uninitialized memory and so caused valgrind to
217        complain.
218    
219    27. Updated RunTest.bat as provided by Sheri Pierce.
220    
221    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
222    
223    29. Computation of memory usage for the table of capturing group names was
224        giving an unnecessarily large value.
225    
226    
227  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011

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