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revision 1022 by ph10, Tue Aug 28 12:28:15 2012 UTC revision 1260 by ph10, Wed Feb 27 15:41:22 2013 UTC
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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    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
77        gives some modest performance improvement in 8-bit mode.
78    
79    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
80        be expressed in certain programming languages using Universal Character
81        Names.
82    
83    
84    Version 8.32 30-November-2012
85    -----------------------------
86    
87  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
88      character iterators.      character iterators.
# Line 16  Version 8.32 Line 96  Version 8.32
96    
97  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
98      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
99    
100  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start  6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
101      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
102      atomic brackets at the start of a pattern, or where there was a subsequent      atomic brackets at the start of a pattern, or where there was a subsequent
103      *PRUNE or *SKIP.      *PRUNE or *SKIP.
104    
105  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
106      Patch by Daniel Richard G.      Patch by Daniel Richard G.
107    
108  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU  8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
109      grep:      grep:
110    
111      (a) There is now no limit to the number of patterns to be matched.      (a) There is now no limit to the number of patterns to be matched.
112    
113      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
114    
115      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
116          are now supported.          are now supported.
117    
118      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
119    
120      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
121          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
122    
123      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
124    
125      (g) In a Windows environment, the default for -d has been changed from      (g) In a Windows environment, the default for -d has been changed from
126          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
127          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
128    
129      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
130    
131  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
132    
133  10. Changed the meaning of \X so that it now matches a Unicode extended  10. Changed the meaning of \X so that it now matches a Unicode extended
134      grapheme cluster.      grapheme cluster.
135    
136  11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting  11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
137      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
138    
139  12. Added support for PCRE_STUDY_EXTRA_NEEDED.  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
140    
141    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
142        structure could go wrong in environments where size_t is not the same size
143        as int.
144    
145    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
146        set.
147    
148    15. The EBCDIC support had decayed; later updates to the code had included
149        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
150        general tidy up of EBCDIC-related issues, and the documentation was also
151        not quite right. There is now a test that can be run on ASCII systems to
152        check some of the EBCDIC-related things (but is it not a full test).
153    
154    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
155        in a small tidy to the code.
156    
157    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
158    
159    18. If the --only-matching (-o) option in pcregrep is specified multiple
160        times, each one causes appropriate output. For example, -o1 -o2 outputs the
161        substrings matched by the 1st and 2nd capturing parentheses. A separating
162        string can be specified by --om-separator (default empty).
163    
164    19. Improving the first n character searches.
165    
166    20. Turn case lists for horizontal and vertical white space into macros so that
167        they are defined only once.
168    
169    21. This set of changes together give more compatible Unicode case-folding
170        behaviour for characters that have more than one other case when UCP
171        support is available.
172    
173        (a) The Unicode property table now has offsets into a new table of sets of
174            three or more characters that are case-equivalent. The MultiStage2.py
175            script that generates these tables (the pcre_ucd.c file) now scans
176            CaseFolding.txt instead of UnicodeData.txt for character case
177            information.
178    
179        (b) The code for adding characters or ranges of characters to a character
180            class has been abstracted into a generalized function that also handles
181            case-independence. In UTF-mode with UCP support, this uses the new data
182            to handle characters with more than one other case.
183    
184        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
185            whose other case is greater than 256 are now correctly matched
186            caselessly. Previously, the high codepoint matched the low one, but not
187            vice versa.
188    
189        (d) The processing of \h, \H, \v, and \ in character classes now makes use
190            of the new class addition function, using character lists defined as
191            macros alongside the case definitions of 20 above.
192    
193        (e) Caseless back references now work with characters that have more than
194            one other case.
195    
196        (f) General caseless matching of characters with more than one other case
197            is supported.
198    
199    22. Unicode character properties were updated from Unicode 6.2.0
200    
201    23. Improved CMake support under Windows. Patch by Daniel Richard G.
202    
203    24. Add support for 32-bit character strings, and UTF-32
204    
205    25. Major JIT compiler update (code refactoring and bugfixing).
206        Experimental Sparc 32 support is added.
207    
208    26. Applied a modified version of Daniel Richard G's patch to create
209        pcre.h.generic and config.h.generic by "make" instead of in the
210        PrepareRelease script.
211    
212    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
213        pcre_compile.c when checking for a zero character.
214    
215    28. Introducing a native interface for JIT. Through this interface, the compiled
216        machine code can be directly executed. The purpose of this interface is to
217        provide fast pattern matching, so several sanity checks are not performed.
218        However, feature tests are still performed. The new interface provides
219        1.4x speedup compared to the old one.
220    
221    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
222        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
223        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
224    
225    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
226        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
227        the "old" RFC 2279). Instead, it ended up passing a negative length to
228        pcre_exec().
229    
230    31. Add support for GCC's visibility feature to hide internal functions.
231    
232    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
233        "unknown -C option" after outputting 0 or 1.
234    
235    33. There is now support for generating a code coverage report for the test
236        suite in environments where gcc is the compiler and lcov is installed. This
237        is mainly for the benefit of the developers.
238    
239    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
240        unaddressable using valgrind annotations, allowing valgrind to detect
241        invalid memory accesses. This is mainly for the benefit of the developers.
242    
243    25. (*UTF) can now be used to start a pattern in any of the three libraries.
244    
245    26. Give configure error if --enable-cpp but no C++ compiler found.
246    
247    
248  Version 8.31 06-July-2012  Version 8.31 06-July-2012

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