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revision 1403 by ph10, Tue Nov 12 17:05:55 2013 UTC revision 1404 by ph10, Tue Nov 19 15:36:57 2013 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.34 xx-xxxx-201x  Version 8.34 19-November-2013
5  --------------------------  -----------------------------
6    
7  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
8      executable memory. Patch inspired by Carsten Klein.      executable memory. Patch inspired by Carsten Klein.
9    
10  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although  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      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      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      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      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      setting this macro in the CMake files (my fault, I just copied it from
16      configure). SUPPORT_GCOV has now been removed.      configure). SUPPORT_GCOV has now been removed.
17    
18  3.  Make a small performance improvement in strlen16() and strlen32() in  3.  Make a small performance improvement in strlen16() and strlen32() in
19      pcretest.      pcretest.
20    
21  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,  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      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
23      these cases). There was also one in pcretest.c.      these cases). There was also one in pcretest.c.
24    
25  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.  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  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      string (which is used for indefinitely repeated groups to allow for
# Line 31  Version 8.34 xx-xxxx-201x Line 31  Version 8.34 xx-xxxx-201x
31      data item and had a minimum repetition of zero (for example, [^\x{100}]* in      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      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.      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  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.      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  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.      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  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      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
43      matched by pcre_exec() without using JIT:      matched by pcre_exec() without using JIT:
44    
45      (a) If the rest of the pattern did not match after a maximal run of      (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          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          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.          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      (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          there was no match, the code could incorrectly back up beyond the match
52          point, and potentially beyond the first character in the subject,          point, and potentially beyond the first character in the subject,
53          leading to a segfault or an incorrect match result.          leading to a segfault or an incorrect match result.
54    
55  10. A conditional group with an assertion condition could lead to PCRE  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      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      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      first data item, and therefore matched "ca" after "c" instead of at the
59      start.      start.
60    
61  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a  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.      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  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.      compiled for z/OS as part of the special z/OS distribution.
66    
67  13. Added the -T and -TM options to pcretest.  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  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      has been refactored. Instead of creating the table dynamically during the
71      actual compiling pass, the information is remembered during the pre-compile      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      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      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      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      shorter) and prepared the way for better handling of references to groups
76      with duplicate names.      with duplicate names.
77    
78  15. A back reference to a named subpattern when there is more than one of the  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.      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      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.      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.  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  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      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      compilation. The code is cleaner, and more cases are handled. The option
88      PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O      PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
89      options in pcretest are provided to set it. It can also be set by      options in pcretest are provided to set it. It can also be set by
90      (*NO_AUTO_POSSESS) at the start of a pattern.      (*NO_AUTO_POSSESS) at the start of a pattern.
91    
92  18. The character VT has been added to the set of characters that match \s and  18. The character VT has been added to the set of characters that match \s and
93      are generally treated as white space, following this same change in Perl      are generally treated as white space, following this same change in Perl
94      5.18. There is now no difference between "Perl space" and "POSIX space".      5.18. There is now no difference between "Perl space" and "POSIX space".
95    
96  19. The code for checking named groups as conditions, either for being set or  19. The code for checking named groups as conditions, either for being set or
97      for being recursed, has been refactored (this is related to 14 and 15      for being recursed, has been refactored (this is related to 14 and 15
98      above). Processing unduplicated named groups should now be as fast at      above). Processing unduplicated named groups should now be as fast at
99      numerical groups, and processing duplicated groups should be faster than      numerical groups, and processing duplicated groups should be faster than
100      before.      before.
101    
102  20. Two patches to the CMake build system, by Alexander Barkov:  20. Two patches to the CMake build system, by Alexander Barkov:
103    
104        (1) Replace the "source" command by "." in CMakeLists.txt because        (1) Replace the "source" command by "." in CMakeLists.txt because
105            "source" is a bash-ism.            "source" is a bash-ism.
106    
107        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
108            without these the CMake build does not work on Solaris.            without these the CMake build does not work on Solaris.
109    
110  21. Perl has changed its handling of \8 and \9. If there is no previously  21. Perl has changed its handling of \8 and \9. If there is no previously
111      encountered capturing group of those numbers, they are treated as the      encountered capturing group of those numbers, they are treated as the
112      literal characters 8 and 9 instead of a binary zero followed by the      literal characters 8 and 9 instead of a binary zero followed by the
113      literals. PCRE now does the same.      literals. PCRE now does the same.
114    
115  22. Following Perl, added \o{} to specify codepoints in octal, making it  22. Following Perl, added \o{} to specify codepoints in octal, making it
116      possible to specify values greater than 0777 and also making them      possible to specify values greater than 0777 and also making them
117      unambiguous.      unambiguous.
118    
119  23. Perl now gives an error for missing closing braces after \x{... instead of  23. Perl now gives an error for missing closing braces after \x{... instead of
120      treating the string as literal. PCRE now does the same.      treating the string as literal. PCRE now does the same.
121    
122  24. RunTest used to grumble if an inappropriate test was selected explicitly,  24. RunTest used to grumble if an inappropriate test was selected explicitly,
123      but just skip it when running all tests. This make it awkward to run ranges      but just skip it when running all tests. This make it awkward to run ranges
124      of tests when one of them was inappropriate. Now it just skips any      of tests when one of them was inappropriate. Now it just skips any
125      inappropriate tests, as it always did when running all tests.      inappropriate tests, as it always did when running all tests.
126    
127  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
128      character types such as \d or \w, too many callouts were inserted, and the      character types such as \d or \w, too many callouts were inserted, and the
129      data that they returned was rubbish.      data that they returned was rubbish.
130    
131  26. In UCP mode, \s was not matching two of the characters that Perl matches,  26. In UCP mode, \s was not matching two of the characters that Perl matches,
132      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
133      were matched by \h. The code has now been refactored so that the lists of      were matched by \h. The code has now been refactored so that the lists of
134      the horizontal and vertical whitespace characters used for \h and \v (which      the horizontal and vertical whitespace characters used for \h and \v (which
135      are defined only in one place) are now also used for \s.      are defined only in one place) are now also used for \s.
136    
137  27. Add JIT support for the 64 bit TileGX architecture.  27. Add JIT support for the 64 bit TileGX architecture.
138      Patch by Jiong Wang (Tilera Corporation).      Patch by Jiong Wang (Tilera Corporation).
139    
140  28. Possessive quantifiers for classes (both explicit and automatically  28. Possessive quantifiers for classes (both explicit and automatically
141      generated) now use special opcodes instead of wrapping in ONCE brackets.      generated) now use special opcodes instead of wrapping in ONCE brackets.
142    
143  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
144      (because it's meaningless), this was not happening when PCRE_CASELESS was      (because it's meaningless), this was not happening when PCRE_CASELESS was
145      set. Not wrong, but inefficient.      set. Not wrong, but inefficient.
146    
147  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
148      properties for \w, \d, etc) is present in a test regex. Otherwise if the      properties for \w, \d, etc) is present in a test regex. Otherwise if the
149      test contains no characters greater than 255, Perl doesn't realise it      test contains no characters greater than 255, Perl doesn't realise it
150      should be using Unicode semantics.      should be using Unicode semantics.
151    
152  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
153      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
154      does in Unicode mode.      does in Unicode mode.
155    
156  32. Added the "forbid" facility to pcretest so that putting tests into the  32. Added the "forbid" facility to pcretest so that putting tests into the
157      wrong test files can sometimes be quickly detected.      wrong test files can sometimes be quickly detected.
158    
159  33. There is now a limit (default 250) on the depth of nesting of parentheses.  33. There is now a limit (default 250) on the depth of nesting of parentheses.
160      This limit is imposed to control the amount of system stack used at compile      This limit is imposed to control the amount of system stack used at compile
161      time. It can be changed at build time by --with-parens-nest-limit=xxx or      time. It can be changed at build time by --with-parens-nest-limit=xxx or
162      the equivalent in CMake.      the equivalent in CMake.
163    
164  34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time  34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
165      errors. Perl warns for these when in warning mode, but PCRE has no facility      errors. Perl warns for these when in warning mode, but PCRE has no facility
166      for giving warnings.      for giving warnings.
167    
168  35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.  35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
169      However, this was not working for (?!) because it is optimized to (*FAIL),      However, this was not working for (?!) because it is optimized to (*FAIL),
170      for which PCRE does not allow quantifiers. The optimization is now disabled      for which PCRE does not allow quantifiers. The optimization is now disabled
171      when a quantifier follows (?!). I can't see any use for this, but it makes      when a quantifier follows (?!). I can't see any use for this, but it makes
172      things uniform.      things uniform.
173    
174  36. Perl no longer allows group names to start with digits, so I have made this  36. Perl no longer allows group names to start with digits, so I have made this
175      change also in PCRE. It simplifies the code a bit.      change also in PCRE. It simplifies the code a bit.
176    
177  37. In extended mode, Perl ignores spaces before a + that indicates a  37. In extended mode, Perl ignores spaces before a + that indicates a
178      possessive quantifier. PCRE allowed a space before the quantifier, but not      possessive quantifier. PCRE allowed a space before the quantifier, but not
179      before the possessive +. It now does.      before the possessive +. It now does.
180    
181  38. The use of \K (reset reported match start) within a repeated possessive  38. The use of \K (reset reported match start) within a repeated possessive
182      group such as (a\Kb)*+ was not working.      group such as (a\Kb)*+ was not working.
183    
184  40. Document that the same character tables must be used at compile time and  40. Document that the same character tables must be used at compile time and
185      run time, and that the facility to pass tables to pcre_exec() and      run time, and that the facility to pass tables to pcre_exec() and
186      pcre_dfa_exec() is for use only with saved/restored patterns.      pcre_dfa_exec() is for use only with saved/restored patterns.
187    
188    
189  Version 8.33 28-May-2013  Version 8.33 28-May-2013

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