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Diffstat (limited to 'pcre/ChangeLog')
| -rw-r--r-- | pcre/ChangeLog | 210 |
1 files changed, 209 insertions, 1 deletions
diff --git a/pcre/ChangeLog b/pcre/ChangeLog index 21cada49c9e..1f1e8600356 100644 --- a/pcre/ChangeLog +++ b/pcre/ChangeLog @@ -1,8 +1,216 @@ 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 --------------------------- +------------------------ 1. Added 'U' to some constants that are compared to unsigned integers, to avoid compiler signed/unsigned warnings. Added (int) casts to unsigned |