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revision 1414 by zherczeg, Sun Dec 22 16:27:35 2013 UTC revision 1474 by zherczeg, Thu Apr 24 06:43:50 2014 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.35-RC1 xx-xxxx-201x  Version 8.36 xx-xxx-2014
5  -----------------------------  ------------------------
6    
7    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
8        -Wmissing-field-initializers and -Wunused-parameter.
9    
10    2.  The tests for quantifiers being too big (greater than 65535) were being
11        applied after reading the number, and stupidly assuming that integer
12        overflow would give a negative number. The tests are now applied as the
13        numbers are read.
14    
15    3.  Tidy code in pcre_exec.c where two branches that used to be different are
16        now the same.
17    
18    4.  The JIT compiler did not generate match limit checks for certain
19        bracketed expressions with quantifiers. This may lead to exponential
20        backtracking, instead of returning with PCRE_ERROR_MATCHLIMIT. This
21        issue should be resolved now.
22    
23    
24    Version 8.35 04-April-2014
25    --------------------------
26    
27  1.  A new flag is set, when property checks are present in an XCLASS.  1.  A new flag is set, when property checks are present in an XCLASS.
28      When this flag is not set, PCRE can perform certain optimizations      When this flag is not set, PCRE can perform certain optimizations
29      such as studying these XCLASS-es.      such as studying these XCLASS-es.
30    
31    2.  The auto-possessification of character sets were improved: a normal
32        and an extended character set can be compared now. Furthermore
33        the JIT compiler optimizes more character set checks.
34    
35    3.  Got rid of some compiler warnings for potentially uninitialized variables
36        that show up only when compiled with -O2.
37    
38    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
39        of a match later then the end of the match. The pcretest program was not
40        handling the case sensibly - it was outputting from the start to the next
41        binary zero. It now reports this situation in a message, and outputs the
42        text from the end to the start.
43    
44    5.  Fast forward search is improved in JIT. Instead of the first three
45        characters, any three characters with fixed position can be searched.
46        Search order: first, last, middle.
47    
48    6.  Improve character range checks in JIT. Characters are read by an inprecise
49        function now, which returns with an unknown value if the character code is
50        above a certain treshold (e.g: 256). The only limitation is that the value
51        must be bigger than the treshold as well. This function is useful, when
52        the characters above the treshold are handled in the same way.
53    
54    7.  The macros whose names start with RAWUCHAR are placeholders for a future
55        mode in which only the bottom 21 bits of 32-bit data items are used. To
56        make this more memorable for those maintaining the code, the names have
57        been changed to start with UCHAR21, and an extensive comment has been added
58        to their definition.
59    
60    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
61        to the export list in Makefile.am (they were accidentally omitted from the
62        8.34 tarball).
63    
64    9.  The informational output from pcretest used the phrase "starting byte set"
65        which is inappropriate for the 16-bit and 32-bit libraries. As the output
66        for "first char" and "need char" really means "non-UTF-char", I've changed
67        "byte" to "char", and slightly reworded the output. The documentation about
68        these values has also been (I hope) clarified.
69    
70    10. Another JIT related optimization: use table jumps for selecting the correct
71        backtracking path, when more than four alternatives are present inside a
72        bracket.
73    
74    11. Empty match is not possible, when the minimum length is greater than zero,
75        and there is no \K in the pattern. JIT should avoid empty match checks in
76        such cases.
77    
78    12. In a caseless character class with UCP support, when a character with more
79        than one alternative case was not the first character of a range, not all
80        the alternative cases were added to the class. For example, s and \x{17f}
81        are both alternative cases for S: the class [RST] was handled correctly,
82        but [R-T] was not.
83    
84    13. The configure.ac file always checked for pthread support when JIT was
85        enabled. This is not used in Windows, so I have put this test inside a
86        check for the presence of windows.h (which was already tested for).
87    
88    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
89        The algorithm provides a way to skip certain starting offsets, and usually
90        faster than linear prefix searches.
91    
92    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
93        as for 'fr_FR' and 'french'. For some reason, however, it then used the
94        Windows-specific input and output files, which have 'french' screwed in.
95        So this could never have worked. One of the problems with locales is that
96        they aren't always the same. I have now updated RunTest so that it checks
97        the output of the locale test (test 3) against three different output
98        files, and it allows the test to pass if any one of them matches. With luck
99        this should make the test pass on some versions of Solaris where it was
100        failing. Because of the uncertainty, the script did not used to stop if
101        test 3 failed; it now does. If further versions of a French locale ever
102        come to light, they can now easily be added.
103    
104    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
105        there was a message during ./configure, but it did not stop. This now
106        provokes an error. The invalid example in README has been corrected.
107        If a value less than the minimum is given, the minimum value has always
108        been used, but now a warning is given.
109    
110    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
111        was a bug in the test system, which is now fixed. Also, the list of various
112        configurations that are tested for each release did not have one with both
113        16/32 bits and --enable-bar-anycrlf. It now does.
114    
115    18. pcretest was missing "-C bsr" for displaying the \R default setting.
116    
117    19. Little endian PowerPC systems are supported now by the JIT compiler.
118    
119    20. The fast forward newline mechanism could enter to an infinite loop on
120        certain invalid UTF-8 input. Although we don't support these cases
121        this issue can be fixed by a performance optimization.
122    
123    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
124        not take account if existing stack usage. There is now a new global
125        variable called pcre_stack_guard that can be set to point to an external
126        function to check stack availability. It is called at the start of
127        processing every parenthesized group.
128    
129    22. A typo in the code meant that in ungreedy mode the max/min qualifier
130        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
131        not match "ab".
132    
133    23. When UTF was disabled, the JIT program reported some incorrect compile
134        errors. These messages are silenced now.
135    
136    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
137        compiler.
138    
139    25. Change all the temporary files used in RunGrepTest to be different to those
140        used by RunTest so that the tests can be run simultaneously, for example by
141        "make -j check".
142    
143    
144  Version 8.34 15-December-2013  Version 8.34 15-December-2013
145  -----------------------------  -----------------------------

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