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revision 1273 by ph10, Fri Mar 8 10:25:02 2013 UTC revision 1388 by ph10, Tue Nov 5 15:24:45 2013 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.33 xx-xxxx-201x  Version 8.34 xx-xxxx-201x
5  -------------------------  --------------------------
6    
7    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
8        executable memory. Patch inspired by Carsten Klein.
9    
10    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
11        this macro is never tested and has no effect, because the work to support
12        coverage involves only compiling and linking options and special targets in
13        the Makefile. The comment in config.h implied that defining the macro would
14        enable coverage support, which is totally false. There was also support for
15        setting this macro in the CMake files (my fault, I just copied it from
16        configure). SUPPORT_GCOV has now been removed.
17    
18    3.  Make a small performance improvement in strlen16() and strlen32() in
19        pcretest.
20    
21    4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
22        detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
23        these cases). There was also one in pcretest.c.
24    
25    5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
26    
27    6.  In UTF mode, the code for checking whether a group could match an empty
28        string (which is used for indefinitely repeated groups to allow for
29        breaking an infinite loop) was broken when the group contained a repeated
30        negated single-character class with a character that occupied more than one
31        data item and had a minimum repetition of zero (for example, [^\x{100}]* in
32        UTF-8 mode). The effect was undefined: the group might or might not be
33        deemed as matching an empty string, or the program might have crashed.
34    
35    7.  The code for checking whether a group could match an empty string was not
36        recognizing that \h, \H, \v, \V, and \R must match a character.
37    
38    8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
39        an empty string. If it can, pcretest shows this in its information output.
40    
41    9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
42        that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
43        matched by pcre_exec() without using JIT:
44    
45        (a) If the rest of the pattern did not match after a maximal run of
46            grapheme clusters, the code for backing up to try with fewer of them
47            did not always back up over a full grapheme when characters that do not
48            have the modifier quality were involved, e.g. Hangul syllables.
49    
50        (b) If the match point in a subject started with modifier character, and
51            there was no match, the code could incorrectly back up beyond the match
52            point, and potentially beyond the first character in the subject,
53            leading to a segfault or an incorrect match result.
54    
55    10. A conditional group with an assertion condition could lead to PCRE
56        recording an incorrect first data item for a match if no other first data
57        item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
58        first data item, and therefore matched "ca" after "c" instead of at the
59        start.
60    
61    11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
62        bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
63    
64    12. The source of pcregrep now includes z/OS-specific code so that it can be
65        compiled for z/OS as part of the special z/OS distribution.
66    
67    13. Added the -T and -TM options to pcretest.
68    
69    14. The code in pcre_compile.c for creating the table of named capturing groups
70        has been refactored. Instead of creating the table dynamically during the
71        actual compiling pass, the information is remembered during the pre-compile
72        pass (on the stack unless there are more than 20 named groups, in which
73        case malloc() is used) and the whole table is created before the actual
74        compile happens. This has simplified the code (it is now nearly 150 lines
75        shorter) and prepared the way for better handling of references to groups
76        with duplicate names.
77    
78    15. A back reference to a named subpattern when there is more than one of the
79        same name now checks them in the order in which they appear in the pattern.
80        The first one that is set is used for the reference. Previously only the
81        first one was inspected. This change makes PCRE more compatible with Perl.
82    
83    16. Unicode character properties were updated from Unicode 6.3.0.
84    
85    17. The compile-time code for auto-possessification has been refactored, based
86        on a patch by Zoltan Herczeg. It now happens after instead of during
87        compilation. The code is cleaner, and more cases are handled. The option
88        PCRE_NO_AUTO_POSSESSIFY is added for testing purposes, and the -O and /O
89        options in pcretest are provided to set it.
90    
91    18. The character VT has been added to the set of characters that match \s and
92        are generally treated as white space, following this same change in Perl
93        5.18. There is now no difference between "Perl space" and "POSIX space".
94    
95    19. The code for checking named groups as conditions, either for being set or
96        for being recursed, has been refactored (this is related to 14 and 15
97        above). Processing unduplicated named groups should now be as fast at
98        numerical groups, and processing duplicated groups should be faster than
99        before.
100    
101    20. Two patches to the CMake build system, by Alexander Barkov:
102    
103          (1) Replace the "source" command by "." in CMakeLists.txt because
104              "source" is a bash-ism.
105    
106          (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
107              without these the CMake build does not work on Solaris.
108    
109    21. Perl has changed its handling of \8 and \9. If there is no previously
110        encountered capturing group of those numbers, they are treated as the
111        literal characters 8 and 9 instead of a binary zero followed by the
112        literals. PCRE now does the same.
113    
114    22. Following Perl, added \o{} to specify codepoints in octal, making it
115        possible to specify values greater than 0777 and also making them
116        unambiguous.
117    
118    23. Perl now gives an error for missing closing braces after \x{... instead of
119        treating the string as literal. PCRE now does the same.
120    
121    24. RunTest used to grumble if an inappropriate test was selected explicitly,
122        but just skip it when running all tests. This make it awkward to run ranges
123        of tests when one of them was inappropriate. Now it just skips any
124        inappropriate tests, as it always did when running all tests.
125    
126    25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
127        character types such as \d or \w, too many callouts were inserted, and the
128        data that they returned was rubbish.
129    
130    26. In UCP mode, \s was not matching two of the characters that Perl matches,
131        namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
132        were matched by \h. The code has now been refactored so that the lists of
133        the horizontal and vertical whitespace characters used for \h and \v (which
134        are defined only in one place) are now also used for \s.
135    
136    27. Add JIT support for the 64 bit TileGX architecture.
137        Patch by Jiong Wang (Tilera Corporation).
138    
139    28. Possessive quantifiers for classes (both explicit and automatically
140        generated) now use special opcodes instead of wrapping in ONCE brackets.
141    
142    29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
143        (because it's meaningless), this was not happening when PCRE_CASELESS was
144        set. Not wrong, but inefficient.
145    
146    30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
147        properties for \w, \d, etc) is present in a test regex. Otherwise if the
148        test contains no characters greater than 255, Perl doesn't realise it
149        should be using Unicode semantics.
150    
151    31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
152        [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
153        does in Unicode mode.
154    
155    32. Added the "forbid" facility to pcretest so that putting tests into the
156        wrong test files can sometimes be quickly detected.
157    
158    
159    Version 8.33 28-May-2013
160    ------------------------
161    
162  1.  Added 'U' to some constants that are compared to unsigned integers, to  1.  Added 'U' to some constants that are compared to unsigned integers, to
163      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned      avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
# Line 14  Version 8.33 xx-xxxx-201x Line 169  Version 8.33 xx-xxxx-201x
169    
170  3.  Revise the creation of config.h.generic so that all boolean macros are  3.  Revise the creation of config.h.generic so that all boolean macros are
171      #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes      #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
172      overriding via -D on the command line possible.      overriding via -D on the command line possible.
173    
174  4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar  4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
175      to unsigned int is reported to make a quite noticeable speed difference in      to unsigned int is reported to make a quite noticeable speed difference in
176      a specific Windows environment. Testing on Linux did also appear to show      a specific Windows environment. Testing on Linux did also appear to show
177      some benefit (and it is clearly not harmful). Also fixed the definition of      some benefit (and it is clearly not harmful). Also fixed the definition of
178      Xop which should be unsigned.      Xop which should be unsigned.
179    
180  5.  Related to (4), changing the definition of the intermediate variable cc  5.  Related to (4), changing the definition of the intermediate variable cc
181      in repeated character loops from pcre_uchar to pcre_uint32 also gave speed      in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
# Line 28  Version 8.33 xx-xxxx-201x Line 183  Version 8.33 xx-xxxx-201x
183    
184  6.  Fix forward search in JIT when link size is 3 or greater. Also removed some  6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
185      unnecessary spaces.      unnecessary spaces.
186    
187  7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12  7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
188      and later.      and later.
189    
190  8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.  8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
191    
192  9.  Optimizing fast_forward_start_bits in JIT.  9.  Optimizing fast_forward_start_bits in JIT.
193    
194  10. Adding experimental support for callouts in JIT, and fixing some  10. Adding support for callouts in JIT, and fixing some issues revealed
195      issues revealed during this work. Namely:      during this work. Namely:
196    
197      (a) Unoptimized capturing brackets incorrectly reset on backtrack.      (a) Unoptimized capturing brackets incorrectly reset on backtrack.
198    
199      (b) Minimum length was not checked before the matching is started.      (b) Minimum length was not checked before the matching is started.
200    
201  11. The value of capture_last that is passed to callouts was incorrect in some  11. The value of capture_last that is passed to callouts was incorrect in some
202      cases when there was a capture on one path that was subsequently abandoned      cases when there was a capture on one path that was subsequently abandoned
203      after a backtrack. Also, the capture_last value is now reset after a      after a backtrack. Also, the capture_last value is now reset after a
204      recursion, since all captures are also reset in this case.      recursion, since all captures are also reset in this case.
205    
206  12. The interpreter no longer returns the "too many substrings" error in the  12. The interpreter no longer returns the "too many substrings" error in the
207      case when an overflowing capture is in a branch that is subsequently      case when an overflowing capture is in a branch that is subsequently
208      abandoned after a backtrack.      abandoned after a backtrack.
209    
210  13. In the pathological case when an offset vector of size 2 is used, pcretest  13. In the pathological case when an offset vector of size 2 is used, pcretest
211      now prints out the matched string after a yield of 0 or 1.      now prints out the matched string after a yield of 0 or 1.
212    
213  14. Inlining subpatterns in recursions, when certain conditions are fulfilled.  14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
# Line 61  Version 8.33 xx-xxxx-201x Line 216  Version 8.33 xx-xxxx-201x
216  15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.  15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
217    
218  16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the  16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
219      offset of the starting point of the matching process, provided the offsets      offset of the starting point of the matching process, provided the offsets
220      vector is large enough.      vector is large enough.
221    
222  17. The \A escape now records a lookbehind value of 1, though its execution  17. The \A escape now records a lookbehind value of 1, though its execution
223      does not actually inspect the previous character. This is to ensure that,      does not actually inspect the previous character. This is to ensure that,
224      in partial multi-segment matching, at least one character from the old      in partial multi-segment matching, at least one character from the old
225      segment is retained when a new segment is processed. Otherwise, if there      segment is retained when a new segment is processed. Otherwise, if there
226      are no lookbehinds in the pattern, \A might match incorrectly at the start      are no lookbehinds in the pattern, \A might match incorrectly at the start
227      of a new segment.      of a new segment.
228    
229  18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.  18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
230    
231  19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this  19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
232      gives some modest performance improvement in 8-bit mode.      gives some modest performance improvement in 8-bit mode.
233    
234  20. Added the PCRE-specific property \p{Xuc} for matching characters that can  20. Added the PCRE-specific property \p{Xuc} for matching characters that can
235      be expressed in certain programming languages using Universal Character      be expressed in certain programming languages using Universal Character
236      Names.      Names.
237    
238  21. Unicode validation has been updated in the light of Unicode Corrigendum #9,  21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
239      which points out that "non characters" are not "characters that may not      which points out that "non characters" are not "characters that may not
240      appear in Unicode strings" but rather "characters that are reserved for      appear in Unicode strings" but rather "characters that are reserved for
241      internal use and have only local meaning".      internal use and have only local meaning".
242    
243  22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and  22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
244      there was a conditional group that depended on an assertion, if the      there was a conditional group that depended on an assertion, if the
245      assertion was false, the callout that immediately followed the alternation      assertion was false, the callout that immediately followed the alternation
246      in the condition was skipped when pcre_exec() was used for matching.      in the condition was skipped when pcre_exec() was used for matching.
247    
248  23. Allow an explicit callout to be inserted before an assertion that is the  23. Allow an explicit callout to be inserted before an assertion that is the
249      condition for a conditional group, for compatibility with automatic      condition for a conditional group, for compatibility with automatic
250      callouts, which always insert a callout at this point.      callouts, which always insert a callout at this point.
251    
252  24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also  24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
253      confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.      confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
254    
255  25. (*PRUNE) is now supported by the JIT compiler.  25. (*PRUNE) is now supported by the JIT compiler.
256    
257  26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.  26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
258    
259    27. Fix the case where there are two or more SKIPs with arguments that may be
260        ignored.
261    
262    28. (*SKIP) is now supported by the JIT compiler.
263    
264    29. (*THEN) is now supported by the JIT compiler.
265    
266    30. Update RunTest with additional test selector options.
267    
268    31. The way PCRE handles backtracking verbs has been changed in two ways.
269    
270        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
271        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
272        backtracking. In some cases this makes it more Perl-compatible, but Perl's
273        rather obscure rules do not always do the same thing.
274    
275        (2) Previously, backtracking verbs were confined within assertions. This is
276        no longer the case for positive assertions, except for (*ACCEPT). Again,
277        this sometimes improves Perl compatibility, and sometimes does not.
278    
279    32. A number of tests that were in test 2 because Perl did things differently
280        have been moved to test 1, because either Perl or PCRE has changed, and
281        these tests are now compatible.
282    
283    32. Backtracking control verbs are now handled in the same way in JIT and
284        interpreter.
285    
286    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
287        contained a forward subroutine reference caused a compile error.
288    
289    34. Auto-detect and optimize limited repetitions in JIT.
290    
291    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
292        blocking (*UTF) etc.
293    
294    36. In the interpreter, maximizing pattern repetitions for characters and
295        character types now use tail recursion, which reduces stack usage.
296    
297    37. The value of the max lookbehind was not correctly preserved if a compiled
298        and saved regex was reloaded on a host of different endianness.
299    
300    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
301        of the compiled pattern block, expand the flags field from 16 to 32 bits
302        because it was almost full.
303    
304    39. Try madvise first before posix_madvise.
305    
306    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
307        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
308        original change locked out all matches of empty strings. This has been
309        changed so that one match of an empty string per line is recognized.
310        Subsequent searches on the same line (for colouring or for --only-matching,
311        for example) do not recognize empty strings.
312    
313    41. Applied a user patch to fix a number of spelling mistakes in comments.
314    
315    42. Data lines longer than 65536 caused pcretest to crash.
316    
317    43. Clarified the data type for length and startoffset arguments for pcre_exec
318        and pcre_dfa_exec in the function-specific man pages, where they were
319        explicitly stated to be in bytes, never having been updated. I also added
320        some clarification to the pcreapi man page.
321    
322    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
323        a segmentation fault.
324    
325    
326  Version 8.32 30-November-2012  Version 8.32 30-November-2012
327  -----------------------------  -----------------------------
# Line 1609  Version 7.9 11-Apr-09 Line 1830  Version 7.9 11-Apr-09
1830  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1831      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1832      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1833      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1834        8.33.]
1835    
1836  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1837      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1852  Version 7.7 07-May-08 Line 2074  Version 7.7 07-May-08
2074      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
2075      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
2076      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
2077      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
2078      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
2079      was subsequently set up correctly.)      was subsequently set up correctly.)
2080    

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