version 1.1.1.4, 2013/07/22 08:25:55
|
version 1.1.1.5, 2014/06/15 19:46:04
|
Line 1
|
Line 1
|
ChangeLog for PCRE |
ChangeLog for PCRE |
------------------ |
------------------ |
|
|
|
Version 8.34 15-December-2013 |
|
----------------------------- |
|
|
|
1. Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT |
|
executable memory. Patch inspired by Carsten Klein. |
|
|
|
2. ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although |
|
this macro is never tested and has no effect, because the work to support |
|
coverage involves only compiling and linking options and special targets in |
|
the Makefile. The comment in config.h implied that defining the macro would |
|
enable coverage support, which is totally false. There was also support for |
|
setting this macro in the CMake files (my fault, I just copied it from |
|
configure). SUPPORT_GCOV has now been removed. |
|
|
|
3. Make a small performance improvement in strlen16() and strlen32() in |
|
pcretest. |
|
|
|
4. Change 36 for 8.33 left some unreachable statements in pcre_exec.c, |
|
detected by the Solaris compiler (gcc doesn't seem to be able to diagnose |
|
these cases). There was also one in pcretest.c. |
|
|
|
5. Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c. |
|
|
|
6. In UTF mode, the code for checking whether a group could match an empty |
|
string (which is used for indefinitely repeated groups to allow for |
|
breaking an infinite loop) was broken when the group contained a repeated |
|
negated single-character class with a character that occupied more than one |
|
data item and had a minimum repetition of zero (for example, [^\x{100}]* in |
|
UTF-8 mode). The effect was undefined: the group might or might not be |
|
deemed as matching an empty string, or the program might have crashed. |
|
|
|
7. The code for checking whether a group could match an empty string was not |
|
recognizing that \h, \H, \v, \V, and \R must match a character. |
|
|
|
8. Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match |
|
an empty string. If it can, pcretest shows this in its information output. |
|
|
|
9. Fixed two related bugs that applied to Unicode extended grapheme clusters |
|
that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when |
|
matched by pcre_exec() without using JIT: |
|
|
|
(a) If the rest of the pattern did not match after a maximal run of |
|
grapheme clusters, the code for backing up to try with fewer of them |
|
did not always back up over a full grapheme when characters that do not |
|
have the modifier quality were involved, e.g. Hangul syllables. |
|
|
|
(b) If the match point in a subject started with modifier character, and |
|
there was no match, the code could incorrectly back up beyond the match |
|
point, and potentially beyond the first character in the subject, |
|
leading to a segfault or an incorrect match result. |
|
|
|
10. A conditional group with an assertion condition could lead to PCRE |
|
recording an incorrect first data item for a match if no other first data |
|
item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a |
|
first data item, and therefore matched "ca" after "c" instead of at the |
|
start. |
|
|
|
11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a |
|
bug that caused the command "echo a | ./pcregrep -M '|a'" to loop. |
|
|
|
12. The source of pcregrep now includes z/OS-specific code so that it can be |
|
compiled for z/OS as part of the special z/OS distribution. |
|
|
|
13. Added the -T and -TM options to pcretest. |
|
|
|
14. The code in pcre_compile.c for creating the table of named capturing groups |
|
has been refactored. Instead of creating the table dynamically during the |
|
actual compiling pass, the information is remembered during the pre-compile |
|
pass (on the stack unless there are more than 20 named groups, in which |
|
case malloc() is used) and the whole table is created before the actual |
|
compile happens. This has simplified the code (it is now nearly 150 lines |
|
shorter) and prepared the way for better handling of references to groups |
|
with duplicate names. |
|
|
|
15. A back reference to a named subpattern when there is more than one of the |
|
same name now checks them in the order in which they appear in the pattern. |
|
The first one that is set is used for the reference. Previously only the |
|
first one was inspected. This change makes PCRE more compatible with Perl. |
|
|
|
16. Unicode character properties were updated from Unicode 6.3.0. |
|
|
|
17. The compile-time code for auto-possessification has been refactored, based |
|
on a patch by Zoltan Herczeg. It now happens after instead of during |
|
compilation. The code is cleaner, and more cases are handled. The option |
|
PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O |
|
options in pcretest are provided to set it. It can also be set by |
|
(*NO_AUTO_POSSESS) at the start of a pattern. |
|
|
|
18. The character VT has been added to the default ("C" locale) set of |
|
characters that match \s and are generally treated as white space, |
|
following this same change in Perl 5.18. There is now no difference between |
|
"Perl space" and "POSIX space". Whether VT is treated as white space in |
|
other locales depends on the locale. |
|
|
|
19. The code for checking named groups as conditions, either for being set or |
|
for being recursed, has been refactored (this is related to 14 and 15 |
|
above). Processing unduplicated named groups should now be as fast at |
|
numerical groups, and processing duplicated groups should be faster than |
|
before. |
|
|
|
20. Two patches to the CMake build system, by Alexander Barkov: |
|
|
|
(1) Replace the "source" command by "." in CMakeLists.txt because |
|
"source" is a bash-ism. |
|
|
|
(2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in; |
|
without these the CMake build does not work on Solaris. |
|
|
|
21. Perl has changed its handling of \8 and \9. If there is no previously |
|
encountered capturing group of those numbers, they are treated as the |
|
literal characters 8 and 9 instead of a binary zero followed by the |
|
literals. PCRE now does the same. |
|
|
|
22. Following Perl, added \o{} to specify codepoints in octal, making it |
|
possible to specify values greater than 0777 and also making them |
|
unambiguous. |
|
|
|
23. Perl now gives an error for missing closing braces after \x{... instead of |
|
treating the string as literal. PCRE now does the same. |
|
|
|
24. RunTest used to grumble if an inappropriate test was selected explicitly, |
|
but just skip it when running all tests. This make it awkward to run ranges |
|
of tests when one of them was inappropriate. Now it just skips any |
|
inappropriate tests, as it always did when running all tests. |
|
|
|
25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained |
|
character types such as \d or \w, too many callouts were inserted, and the |
|
data that they returned was rubbish. |
|
|
|
26. In UCP mode, \s was not matching two of the characters that Perl matches, |
|
namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they |
|
were matched by \h. The code has now been refactored so that the lists of |
|
the horizontal and vertical whitespace characters used for \h and \v (which |
|
are defined only in one place) are now also used for \s. |
|
|
|
27. Add JIT support for the 64 bit TileGX architecture. |
|
Patch by Jiong Wang (Tilera Corporation). |
|
|
|
28. Possessive quantifiers for classes (both explicit and automatically |
|
generated) now use special opcodes instead of wrapping in ONCE brackets. |
|
|
|
29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier |
|
(because it's meaningless), this was not happening when PCRE_CASELESS was |
|
set. Not wrong, but inefficient. |
|
|
|
30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode |
|
properties for \w, \d, etc) is present in a test regex. Otherwise if the |
|
test contains no characters greater than 255, Perl doesn't realise it |
|
should be using Unicode semantics. |
|
|
|
31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and |
|
[:punct:] when PCRE_UCP is set so as to include the same characters as Perl |
|
does in Unicode mode. |
|
|
|
32. Added the "forbid" facility to pcretest so that putting tests into the |
|
wrong test files can sometimes be quickly detected. |
|
|
|
33. There is now a limit (default 250) on the depth of nesting of parentheses. |
|
This limit is imposed to control the amount of system stack used at compile |
|
time. It can be changed at build time by --with-parens-nest-limit=xxx or |
|
the equivalent in CMake. |
|
|
|
34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time |
|
errors. Perl warns for these when in warning mode, but PCRE has no facility |
|
for giving warnings. |
|
|
|
35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does. |
|
However, this was not working for (?!) because it is optimized to (*FAIL), |
|
for which PCRE does not allow quantifiers. The optimization is now disabled |
|
when a quantifier follows (?!). I can't see any use for this, but it makes |
|
things uniform. |
|
|
|
36. Perl no longer allows group names to start with digits, so I have made this |
|
change also in PCRE. It simplifies the code a bit. |
|
|
|
37. In extended mode, Perl ignores spaces before a + that indicates a |
|
possessive quantifier. PCRE allowed a space before the quantifier, but not |
|
before the possessive +. It now does. |
|
|
|
38. The use of \K (reset reported match start) within a repeated possessive |
|
group such as (a\Kb)*+ was not working. |
|
|
|
40. Document that the same character tables must be used at compile time and |
|
run time, and that the facility to pass tables to pcre_exec() and |
|
pcre_dfa_exec() is for use only with saved/restored patterns. |
|
|
|
41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new |
|
features for Builds with MSVC: |
|
|
|
1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW |
|
builds). The .rc files can be used to set FileDescription and many other |
|
attributes. |
|
|
|
2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files. |
|
This allows higher-level build scripts which want .pdb files to avoid |
|
hard-coding the exact files needed." |
|
|
|
42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to |
|
mean "start of word" and "end of word", respectively, as a transition aid. |
|
|
|
43. A minimizing repeat of a class containing codepoints greater than 255 in |
|
non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was |
|
compiled to use the heap for recursion. |
|
|
|
44. Got rid of some compiler warnings for unused variables when UTF but not UCP |
|
is configured. |
|
|
|
|
Version 8.33 28-May-2013 |
Version 8.33 28-May-2013 |
-------------------------- | ------------------------ |
|
|
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 |
avoid compiler signed/unsigned warnings. Added (int) casts to unsigned |
avoid compiler signed/unsigned warnings. Added (int) casts to unsigned |