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revision 773 by ph10, Wed Nov 30 18:10:27 2011 UTC revision 936 by ph10, Sat Feb 25 17:02:23 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    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. (*COMMIT) is now correctly confined to within a recursive subpattern call.
59    
60    14. It is now possible to link pcretest with libedit as an alternative to
61        libreadline.
62    
63    
64    Version 8.30 04-February-2012
65    -----------------------------
66    
67    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
68        name is defined in ctype.h.
69    
70    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
71        only in quite long subpatterns.
72    
73    3.  Removed the function pcre_info(), which has been obsolete and deprecated
74        since it was replaced by pcre_fullinfo() in February 2000.
75    
76    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
77        match a (*MARK), and the match failed at the start of the subject, a
78        reference to memory before the start of the subject could occur. This bug
79        was introduced by fix 17 of release 8.21.
80    
81    5.  A reference to an unset group with zero minimum repetition was giving
82        totally wrong answers (in non-JavaScript-compatibility mode). For example,
83        /(another)?(\1?)test/ matched against "hello world test". This bug was
84        introduced in release 8.13.
85    
86    6.  Add support for 16-bit character strings (a large amount of work involving
87        many changes and refactorings).
88    
89    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
90        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
91        from a file.
92    
93    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
94        rounding is not applied in this particular case).
95    
96    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
97        if they appear, or are escaped, in patterns.
98    
99    10. Get rid of a number of -Wunused-but-set-variable warnings.
100    
101    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
102        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
103        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
104        also returns the mark "x". This bug applied to capturing parentheses,
105        non-capturing parentheses, and atomic parentheses. It also applied to some
106        assertions.
107    
108    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
109        information out of configure.ac instead of relying on pcre.h.generic, which
110        is not stored in the repository.
111    
112    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
113        -lreadline.
114    
115    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
116    
117    15. Applied Graycode's patch to put the top-level frame on the stack rather
118        than the heap when not using the stack for recursion. This gives a
119        performance improvement in many cases when recursion is not deep.
120    
121    16. Experimental code added to "pcretest -C" to output the stack frame size.
122    
123    
124    Version 8.21 12-Dec-2011
125    ------------------------
126    
127  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
128    
# Line 13  Version 8.21 Line 133  Version 8.21
133      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
134      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
135    
136  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
137      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
138      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
139    
# Line 22  Version 8.21 Line 142  Version 8.21
142    
143  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
144      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
145      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
146    
147  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
148      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
149      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)
150      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
151      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
152      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
153      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
154      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
155      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
156    
157  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
158      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
159    
160  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
161      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
162      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
163      the first (A) could occur when it should not.      the first (A) could occur when it should not.
164    
165  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
166    
167  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
168    
169  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
170      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
171      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
172    
173  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.
174    
175  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
176      also gives an error.      also gives an error.
177    
178  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,
179      it caused the error "internal error: overran compiling workspace". The      it caused the error "internal error: overran compiling workspace". The
180      maximum number of forward references (including repeats) was limited by the      maximum number of forward references (including repeats) was limited by the
181      internal workspace, and dependent on the LINK_SIZE. The code has been      internal workspace, and dependent on the LINK_SIZE. The code has been
182      rewritten so that the workspace expands (via pcre_malloc) if necessary, and      rewritten so that the workspace expands (via pcre_malloc) if necessary, and
183      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)
184      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
185      the filling in of repeated forward references.      the filling in of repeated forward references.
186    
187  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
188      incorrectly expecting the subject to contain another "a" after the start.      incorrectly expecting the subject to contain another "a" after the start.
189    
190  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
191      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
192      the SKIP was being treated as NOMATCH. For patterns such as      the SKIP was being treated as NOMATCH. For patterns such as
193      /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
194      tested.      tested.
195    
196  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
197      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
198      is a non-match for a non-anchored pattern. For example, if      is a non-match for a non-anchored pattern. For example, if
199      /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
200      "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
201      change is that for partial matches, the last encountered mark name is      change is that for partial matches, the last encountered mark name is
202      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
203      Perl-compatible have been moved into the Perl-compatible test files. The      Perl-compatible have been moved into the Perl-compatible test files. The
204      refactoring has had the pleasing side effect of removing one argument from      refactoring has had the pleasing side effect of removing one argument from
205      the match() function, thus reducing its stack requirements.      the match() function, thus reducing its stack requirements.
206    
207    19. If the /S+ option was used in pcretest to study a pattern using JIT,
208        subsequent uses of /S (without +) incorrectly behaved like /S+.
209    
210    21. Retrieve executable code size support for the JIT compiler and fixing
211        some warnings.
212    
213    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
214        not work when the shorter character appeared right at the end of the
215        subject string.
216    
217    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
218        systems.
219    
220    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
221        output it when the /M option is used in pcretest.
222    
223    25. The CheckMan script was not being included in the distribution. Also, added
224        an explicit "perl" to run Perl scripts from the PrepareRelease script
225        because this is reportedly needed in Windows.
226    
227    26. If study data was being save in a file and studying had not found a set of
228        "starts with" bytes for the pattern, the data written to the file (though
229        never used) was taken from uninitialized memory and so caused valgrind to
230        complain.
231    
232    27. Updated RunTest.bat as provided by Sheri Pierce.
233    
234    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
235    
236    29. Computation of memory usage for the table of capturing group names was
237        giving an unnecessarily large value.
238    
239    
240  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
241  ------------------------  ------------------------

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