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ChangeLog for PCRE |
ChangeLog for PCRE |
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Version 8.31 |
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1. Fixing a wrong JIT test case and some compiler warnings. |
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Version 8.30 04-February-2012 |
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1. Renamed "isnumber" as "is_a_number" because in some Mac environments this |
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name is defined in ctype.h. |
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2. Fixed a bug in fixed-length calculation for lookbehinds that would show up |
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only in quite long subpatterns. |
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3. Removed the function pcre_info(), which has been obsolete and deprecated |
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since it was replaced by pcre_fullinfo() in February 2000. |
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4. For a non-anchored pattern, if (*SKIP) was given with a name that did not |
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match a (*MARK), and the match failed at the start of the subject, a |
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reference to memory before the start of the subject could occur. This bug |
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was introduced by fix 17 of release 8.21. |
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5. A reference to an unset group with zero minimum repetition was giving |
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totally wrong answers (in non-JavaScript-compatibility mode). For example, |
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/(another)?(\1?)test/ matched against "hello world test". This bug was |
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introduced in release 8.13. |
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6. Add support for 16-bit character strings (a large amount of work involving |
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many changes and refactorings). |
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7. RunGrepTest failed on msys because \r\n was replaced by whitespace when the |
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command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken |
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from a file. |
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8. Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size |
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rounding is not applied in this particular case). |
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9. The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected |
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if they appear, or are escaped, in patterns. |
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10. Get rid of a number of -Wunused-but-set-variable warnings. |
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11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark |
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"x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all. |
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Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern |
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also returns the mark "x". This bug applied to capturing parentheses, |
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non-capturing parentheses, and atomic parentheses. It also applied to some |
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assertions. |
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12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version |
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information out of configure.ac instead of relying on pcre.h.generic, which |
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is not stored in the repository. |
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13. Applied Dmitry V. Levin's patch for a more portable method for linking with |
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-lreadline. |
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14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C. |
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15. Applied Graycode's patch to put the top-level frame on the stack rather |
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than the heap when not using the stack for recursion. This gives a |
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performance improvement in many cases when recursion is not deep. |
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16. Experimental code added to "pcretest -C" to output the stack frame size. |
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Version 8.21 12-Dec-2011 |
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1. Updating the JIT compiler. |
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2. JIT compiler now supports OP_NCREF, OP_RREF and OP_NRREF. New test cases |
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are added as well. |
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3. Fix cache-flush issue on PowerPC (It is still an experimental JIT port). |
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PCRE_EXTRA_TABLES is not suported by JIT, and should be checked before |
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calling _pcre_jit_exec. Some extra comments are added. |
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4. (*MARK) settings inside atomic groups that do not contain any capturing |
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parentheses, for example, (?>a(*:m)), were not being passed out. This bug |
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was introduced by change 18 for 8.20. |
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5. Supporting of \x, \U and \u in JavaScript compatibility mode based on the |
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ECMA-262 standard. |
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6. Lookbehinds such as (?<=a{2}b) that contained a fixed repetition were |
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erroneously being rejected as "not fixed length" if PCRE_CASELESS was set. |
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This bug was probably introduced by change 9 of 8.13. |
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7. While fixing 6 above, I noticed that a number of other items were being |
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incorrectly rejected as "not fixed length". This arose partly because newer |
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opcodes had not been added to the fixed-length checking code. I have (a) |
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corrected the bug and added tests for these items, and (b) arranged for an |
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error to occur if an unknown opcode is encountered while checking for fixed |
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length instead of just assuming "not fixed length". The items that were |
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rejected were: (*ACCEPT), (*COMMIT), (*FAIL), (*MARK), (*PRUNE), (*SKIP), |
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(*THEN), \h, \H, \v, \V, and single character negative classes with fixed |
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repetitions, e.g. [^a]{3}, with and without PCRE_CASELESS. |
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8. A possessively repeated conditional subpattern such as (?(?=c)c|d)++ was |
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being incorrectly compiled and would have given unpredicatble results. |
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9. A possessively repeated subpattern with minimum repeat count greater than |
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one behaved incorrectly. For example, (A){2,}+ behaved as if it was |
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(A)(A)++ which meant that, after a subsequent mismatch, backtracking into |
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the first (A) could occur when it should not. |
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10. Add a cast and remove a redundant test from the code. |
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11. JIT should use pcre_malloc/pcre_free for allocation. |
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12. Updated pcre-config so that it no longer shows -L/usr/lib, which seems |
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best practice nowadays, and helps with cross-compiling. (If the exec_prefix |
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is anything other than /usr, -L is still shown). |
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13. In non-UTF-8 mode, \C is now supported in lookbehinds and DFA matching. |
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14. Perl does not support \N without a following name in a [] class; PCRE now |
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also gives an error. |
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15. If a forward reference was repeated with an upper limit of around 2000, |
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it caused the error "internal error: overran compiling workspace". The |
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maximum number of forward references (including repeats) was limited by the |
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internal workspace, and dependent on the LINK_SIZE. The code has been |
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rewritten so that the workspace expands (via pcre_malloc) if necessary, and |
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the default depends on LINK_SIZE. There is a new upper limit (for safety) |
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of around 200,000 forward references. While doing this, I also speeded up |
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the filling in of repeated forward references. |
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16. A repeated forward reference in a pattern such as (a)(?2){2}(.) was |
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incorrectly expecting the subject to contain another "a" after the start. |
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17. When (*SKIP:name) is activated without a corresponding (*MARK:name) earlier |
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in the match, the SKIP should be ignored. This was not happening; instead |
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the SKIP was being treated as NOMATCH. For patterns such as |
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/A(*MARK:A)A+(*SKIP:B)Z|AAC/ this meant that the AAC branch was never |
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tested. |
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18. The behaviour of (*MARK), (*PRUNE), and (*THEN) has been reworked and is |
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now much more compatible with Perl, in particular in cases where the result |
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is a non-match for a non-anchored pattern. For example, if |
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/b(*:m)f|a(*:n)w/ is matched against "abc", the non-match returns the name |
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"m", where previously it did not return a name. A side effect of this |
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change is that for partial matches, the last encountered mark name is |
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returned, as for non matches. A number of tests that were previously not |
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Perl-compatible have been moved into the Perl-compatible test files. The |
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refactoring has had the pleasing side effect of removing one argument from |
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the match() function, thus reducing its stack requirements. |
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19. If the /S+ option was used in pcretest to study a pattern using JIT, |
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subsequent uses of /S (without +) incorrectly behaved like /S+. |
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21. Retrieve executable code size support for the JIT compiler and fixing |
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some warnings. |
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22. A caseless match of a UTF-8 character whose other case uses fewer bytes did |
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not work when the shorter character appeared right at the end of the |
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subject string. |
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23. Added some (int) casts to non-JIT modules to reduce warnings on 64-bit |
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systems. |
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24. Added PCRE_INFO_JITSIZE to pass on the value from (21) above, and also |
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output it when the /M option is used in pcretest. |
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25. The CheckMan script was not being included in the distribution. Also, added |
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an explicit "perl" to run Perl scripts from the PrepareRelease script |
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because this is reportedly needed in Windows. |
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26. If study data was being save in a file and studying had not found a set of |
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"starts with" bytes for the pattern, the data written to the file (though |
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never used) was taken from uninitialized memory and so caused valgrind to |
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complain. |
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27. Updated RunTest.bat as provided by Sheri Pierce. |
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28. Fixed a possible uninitialized memory bug in pcre_jit_compile.c. |
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29. Computation of memory usage for the table of capturing group names was |
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giving an unnecessarily large value. |
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Version 8.20 21-Oct-2011 |
Version 8.20 21-Oct-2011 |
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------------------------ |
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