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revision 989 by zherczeg, Sat Jul 7 11:11:02 2012 UTC revision 1254 by ph10, Fri Feb 22 12:46:26 2013 UTC
# Line 1  Line 1 
1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.32  Version 8.33 xx-xxxx-201x
5  ------------  -------------------------
6    
7    1.  Added 'U' to some constants that are compared to unsigned integers, to
8        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
9        variables that are added to signed variables, to ensure the result is
10        signed and can be negated.
11    
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
14    
15    3.  Revise the creation of config.h.generic so that all boolean macros are
16        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
17        overriding via -D on the command line possible.
18    
19    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
20        to unsigned int is reported to make a quite noticeable speed difference in
21        a specific Windows environment. Testing on Linux did also appear to show
22        some benefit (and it is clearly not harmful). Also fixed the definition of
23        Xop which should be unsigned.
24    
25    5.  Related to (4), changing the definition of the intermediate variable cc
26        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
27        improvements.
28    
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
31    
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
34    
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
36    
37    9.  Optimizing fast_forward_start_bits in JIT.
38    
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
41    
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
43    
44        (b) Minimum length was not checked before the matching is started.
45    
46    11. The value of capture_last that is passed to callouts was incorrect in some
47        cases when there was a capture on one path that was subsequently abandoned
48        after a backtrack. Also, the capture_last value is now reset after a
49        recursion, since all captures are also reset in this case.
50    
51    12. The interpreter no longer returns the "too many substrings" error in the
52        case when an overflowing capture is in a branch that is subsequently
53        abandoned after a backtrack.
54    
55    13. In the pathological case when an offset vector of size 2 is used, pcretest
56        now prints out the matched string after a yield of 0 or 1.
57    
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
60    
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
62    
63    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
64        offset of the starting point of the matching process, provided the offsets
65        vector is large enough.
66    
67    17. The \A escape now records a lookbehind value of 1, though its execution
68        does not actually inspect the previous character. This is to ensure that,
69        in partial multi-segment matching, at least one character from the old
70        segment is retained when a new segment is processed. Otherwise, if there
71        are no lookbehinds in the pattern, \A might match incorrectly at the start
72        of a new segment.
73    
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
75    
76    
77    Version 8.32 30-November-2012
78    -----------------------------
79    
80  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
81      character iterators.      character iterators.
# Line 12  Version 8.32 Line 85  Version 8.32
85    
86  3.  Single character iterator optimizations in the JIT compiler.  3.  Single character iterator optimizations in the JIT compiler.
87    
88    4.  Improved JIT compiler optimizations for character ranges.
89    
90    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
91        Reported by Giuseppe D'Angelo.
92    
93    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
94        of a line, was being set incorrectly in cases where .* appeared inside
95        atomic brackets at the start of a pattern, or where there was a subsequent
96        *PRUNE or *SKIP.
97    
98    7.  Improved instruction cache flush for POWER/PowerPC.
99        Patch by Daniel Richard G.
100    
101    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
102        grep:
103    
104        (a) There is now no limit to the number of patterns to be matched.
105    
106        (b) An error is given if a pattern is too long.
107    
108        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
109            are now supported.
110    
111        (d) --exclude-from and --include-from (multiple use) have been added.
112    
113        (e) Exclusions and inclusions now apply to all files and directories, not
114            just to those obtained from scanning a directory recursively.
115    
116        (f) Multiple uses of -f and --file-list are now supported.
117    
118        (g) In a Windows environment, the default for -d has been changed from
119            "read" (the GNU grep default) to "skip", because otherwise the presence
120            of a directory in the file list provokes an error.
121    
122        (h) The documentation has been revised and clarified in places.
123    
124    9.  Improve the matching speed of capturing brackets.
125    
126    10. Changed the meaning of \X so that it now matches a Unicode extended
127        grapheme cluster.
128    
129    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
130        out POSIX threads when JIT support is configured.
131    
132    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
133    
134    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
135        structure could go wrong in environments where size_t is not the same size
136        as int.
137    
138    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
139        set.
140    
141    15. The EBCDIC support had decayed; later updates to the code had included
142        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
143        general tidy up of EBCDIC-related issues, and the documentation was also
144        not quite right. There is now a test that can be run on ASCII systems to
145        check some of the EBCDIC-related things (but is it not a full test).
146    
147    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
148        in a small tidy to the code.
149    
150    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
151    
152    18. If the --only-matching (-o) option in pcregrep is specified multiple
153        times, each one causes appropriate output. For example, -o1 -o2 outputs the
154        substrings matched by the 1st and 2nd capturing parentheses. A separating
155        string can be specified by --om-separator (default empty).
156    
157    19. Improving the first n character searches.
158    
159    20. Turn case lists for horizontal and vertical white space into macros so that
160        they are defined only once.
161    
162    21. This set of changes together give more compatible Unicode case-folding
163        behaviour for characters that have more than one other case when UCP
164        support is available.
165    
166        (a) The Unicode property table now has offsets into a new table of sets of
167            three or more characters that are case-equivalent. The MultiStage2.py
168            script that generates these tables (the pcre_ucd.c file) now scans
169            CaseFolding.txt instead of UnicodeData.txt for character case
170            information.
171    
172        (b) The code for adding characters or ranges of characters to a character
173            class has been abstracted into a generalized function that also handles
174            case-independence. In UTF-mode with UCP support, this uses the new data
175            to handle characters with more than one other case.
176    
177        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
178            whose other case is greater than 256 are now correctly matched
179            caselessly. Previously, the high codepoint matched the low one, but not
180            vice versa.
181    
182        (d) The processing of \h, \H, \v, and \ in character classes now makes use
183            of the new class addition function, using character lists defined as
184            macros alongside the case definitions of 20 above.
185    
186        (e) Caseless back references now work with characters that have more than
187            one other case.
188    
189        (f) General caseless matching of characters with more than one other case
190            is supported.
191    
192    22. Unicode character properties were updated from Unicode 6.2.0
193    
194    23. Improved CMake support under Windows. Patch by Daniel Richard G.
195    
196    24. Add support for 32-bit character strings, and UTF-32
197    
198    25. Major JIT compiler update (code refactoring and bugfixing).
199        Experimental Sparc 32 support is added.
200    
201    26. Applied a modified version of Daniel Richard G's patch to create
202        pcre.h.generic and config.h.generic by "make" instead of in the
203        PrepareRelease script.
204    
205    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
206        pcre_compile.c when checking for a zero character.
207    
208    28. Introducing a native interface for JIT. Through this interface, the compiled
209        machine code can be directly executed. The purpose of this interface is to
210        provide fast pattern matching, so several sanity checks are not performed.
211        However, feature tests are still performed. The new interface provides
212        1.4x speedup compared to the old one.
213    
214    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
215        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
216        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
217    
218    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
219        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
220        the "old" RFC 2279). Instead, it ended up passing a negative length to
221        pcre_exec().
222    
223    31. Add support for GCC's visibility feature to hide internal functions.
224    
225    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
226        "unknown -C option" after outputting 0 or 1.
227    
228    33. There is now support for generating a code coverage report for the test
229        suite in environments where gcc is the compiler and lcov is installed. This
230        is mainly for the benefit of the developers.
231    
232    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
233        unaddressable using valgrind annotations, allowing valgrind to detect
234        invalid memory accesses. This is mainly for the benefit of the developers.
235    
236    25. (*UTF) can now be used to start a pattern in any of the three libraries.
237    
238    26. Give configure error if --enable-cpp but no C++ compiler found.
239    
240    
241  Version 8.31 06-July-2012  Version 8.31 06-July-2012
242  -------------------------  -------------------------

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