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revision 773 by ph10, Wed Nov 30 18:10:27 2011 UTC revision 961 by ph10, Fri Apr 20 11:49:13 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. 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    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
91        was not doing so when it should - probably a typo introduced by SVN 528
92        (change 8.10/14).
93    
94    
95    Version 8.30 04-February-2012
96    -----------------------------
97    
98    1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
99        name is defined in ctype.h.
100    
101    2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
102        only in quite long subpatterns.
103    
104    3.  Removed the function pcre_info(), which has been obsolete and deprecated
105        since it was replaced by pcre_fullinfo() in February 2000.
106    
107    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
108        match a (*MARK), and the match failed at the start of the subject, a
109        reference to memory before the start of the subject could occur. This bug
110        was introduced by fix 17 of release 8.21.
111    
112    5.  A reference to an unset group with zero minimum repetition was giving
113        totally wrong answers (in non-JavaScript-compatibility mode). For example,
114        /(another)?(\1?)test/ matched against "hello world test". This bug was
115        introduced in release 8.13.
116    
117    6.  Add support for 16-bit character strings (a large amount of work involving
118        many changes and refactorings).
119    
120    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
121        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
122        from a file.
123    
124    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
125        rounding is not applied in this particular case).
126    
127    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
128        if they appear, or are escaped, in patterns.
129    
130    10. Get rid of a number of -Wunused-but-set-variable warnings.
131    
132    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
133        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
134        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
135        also returns the mark "x". This bug applied to capturing parentheses,
136        non-capturing parentheses, and atomic parentheses. It also applied to some
137        assertions.
138    
139    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
140        information out of configure.ac instead of relying on pcre.h.generic, which
141        is not stored in the repository.
142    
143    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
144        -lreadline.
145    
146    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
147    
148    15. Applied Graycode's patch to put the top-level frame on the stack rather
149        than the heap when not using the stack for recursion. This gives a
150        performance improvement in many cases when recursion is not deep.
151    
152    16. Experimental code added to "pcretest -C" to output the stack frame size.
153    
154    
155    Version 8.21 12-Dec-2011
156    ------------------------
157    
158  1.  Updating the JIT compiler.  1.  Updating the JIT compiler.
159    
# Line 13  Version 8.21 Line 164  Version 8.21
164      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
165      calling _pcre_jit_exec. Some extra comments are added.      calling _pcre_jit_exec. Some extra comments are added.
166    
167  4.  Mark settings inside atomic groups that do not contain any capturing  4.  (*MARK) settings inside atomic groups that do not contain any capturing
168      parentheses, for example, (?>a(*:m)), were not being passed out. This bug      parentheses, for example, (?>a(*:m)), were not being passed out. This bug
169      was introduced by change 18 for 8.20.      was introduced by change 18 for 8.20.
170    
# Line 22  Version 8.21 Line 173  Version 8.21
173    
174  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
175      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.      erroneously being rejected as "not fixed length" if PCRE_CASELESS was set.
176      This bug was probably introduced by change 9 of 8.13.      This bug was probably introduced by change 9 of 8.13.
177    
178  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
179      incorrectly rejected as "not fixed length". This arose partly because newer      incorrectly rejected as "not fixed length". This arose partly because newer
180      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)
181      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
182      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
183      length instead of just assuming "not fixed length". The items that were      length instead of just assuming "not fixed length". The items that were
184      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),      rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP),
185      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed      (*THEN), \h, \H, \v, \V, and single character negative classes with fixed
186      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.      repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS.
187    
188  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was  8.  A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was
189      being incorrectly compiled and would have given unpredicatble results.      being incorrectly compiled and would have given unpredicatble results.
190    
191  9.  A possessively repeated subpattern with minimum repeat count greater than  9.  A possessively repeated subpattern with minimum repeat count greater than
192      one behaved incorrectly. For example, (A){2,}+ behaved as if it was      one behaved incorrectly. For example, (A){2,}+ behaved as if it was
193      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into      (A)(A)++ which meant that, after a subsequent mismatch, backtracking into
194      the first (A) could occur when it should not.      the first (A) could occur when it should not.
195    
196  10. Add a cast and remove a redundant test from the code.  10. Add a cast and remove a redundant test from the code.
197    
198  11. JIT should use pcre_malloc/pcre_free for allocation.  11. JIT should use pcre_malloc/pcre_free for allocation.
199    
200  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
201      best practice nowadays, and helps with cross-compiling. (If the exec_prefix      best practice nowadays, and helps with cross-compiling. (If the exec_prefix
202      is anything other than /usr, -L is still shown).      is anything other than /usr, -L is still shown).
203    
204  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.
205    
206  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
207      also gives an error.      also gives an error.
208    
209  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,
210      it caused the error "internal error: overran compiling workspace". The      it caused the error "internal error: overran compiling workspace". The
211      maximum number of forward references (including repeats) was limited by the      maximum number of forward references (including repeats) was limited by the
212      internal workspace, and dependent on the LINK_SIZE. The code has been      internal workspace, and dependent on the LINK_SIZE. The code has been
213      rewritten so that the workspace expands (via pcre_malloc) if necessary, and      rewritten so that the workspace expands (via pcre_malloc) if necessary, and
214      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)
215      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
216      the filling in of repeated forward references.      the filling in of repeated forward references.
217    
218  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
219      incorrectly expecting the subject to contain another "a" after the start.      incorrectly expecting the subject to contain another "a" after the start.
220    
221  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier  17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier
222      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
223      the SKIP was being treated as NOMATCH. For patterns such as      the SKIP was being treated as NOMATCH. For patterns such as
224      /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
225      tested.      tested.
226    
227  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
228      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
229      is a non-match for a non-anchored pattern. For example, if      is a non-match for a non-anchored pattern. For example, if
230      /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
231      "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
232      change is that for partial matches, the last encountered mark name is      change is that for partial matches, the last encountered mark name is
233      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
234      Perl-compatible have been moved into the Perl-compatible test files. The      Perl-compatible have been moved into the Perl-compatible test files. The
235      refactoring has had the pleasing side effect of removing one argument from      refactoring has had the pleasing side effect of removing one argument from
236      the match() function, thus reducing its stack requirements.      the match() function, thus reducing its stack requirements.
237    
238    19. If the /S+ option was used in pcretest to study a pattern using JIT,
239        subsequent uses of /S (without +) incorrectly behaved like /S+.
240    
241    21. Retrieve executable code size support for the JIT compiler and fixing
242        some warnings.
243    
244    22. A caseless match of a UTF-8 character whose other case uses fewer bytes did
245        not work when the shorter character appeared right at the end of the
246        subject string.
247    
248    23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit
249        systems.
250    
251    24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also
252        output it when the /M option is used in pcretest.
253    
254    25. The CheckMan script was not being included in the distribution. Also, added
255        an explicit "perl" to run Perl scripts from the PrepareRelease script
256        because this is reportedly needed in Windows.
257    
258    26. If study data was being save in a file and studying had not found a set of
259        "starts with" bytes for the pattern, the data written to the file (though
260        never used) was taken from uninitialized memory and so caused valgrind to
261        complain.
262    
263    27. Updated RunTest.bat as provided by Sheri Pierce.
264    
265    28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c.
266    
267    29. Computation of memory usage for the table of capturing group names was
268        giving an unnecessarily large value.
269    
270    
271  Version 8.20 21-Oct-2011  Version 8.20 21-Oct-2011
272  ------------------------  ------------------------

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