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revision 1045 by ph10, Sun Sep 23 16:50:00 2012 UTC revision 1248 by ph10, Wed Feb 13 17:36:38 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        WARNING: Callouts are not release ready! <- this line needs to be removed when it is.
47    
48    11. The value of capture_last that is passed to callouts was incorrect in some
49        cases when there was a capture on one path that was subsequently abandoned
50        after a backtrack. Also, the capture_last value is now reset after a
51        recursion, since all captures are also reset in this case.
52    
53    12. The interpreter no longer returns the "too many substrings" error in the
54        case when an overflowing capture is in a branch that is subsequently
55        abandoned after a backtrack.
56    
57    13. In the pathological case when an offset vector of size 2 is used, pcretest
58        now prints out the matched string after a yield of 0 or 1.
59    
60    
61    Version 8.32 30-November-2012
62    -----------------------------
63    
64  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
65      character iterators.      character iterators.
# Line 16  Version 8.32 Line 73  Version 8.32
73    
74  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
75      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
76    
77  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
78      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
79      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
80      *PRUNE or *SKIP.      *PRUNE or *SKIP.
81    
82  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
83      Patch by Daniel Richard G.      Patch by Daniel Richard G.
84    
85  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
86      grep:      grep:
87    
88      (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.
89    
90      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
91    
92      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
93          are now supported.          are now supported.
94    
95      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
96    
97      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
98          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
99    
100      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
101    
102      (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
103          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
104          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
105    
106      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
107    
108  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
109    
110  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
111      grapheme cluster.      grapheme cluster.
112    
113  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
114      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
115    
116  12. Added support for PCRE_STUDY_EXTRA_NEEDED.  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
117    
118  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
119      structure could go wrong in environments where size_t is not the same size      structure could go wrong in environments where size_t is not the same size
120      as int.      as int.
121    
122  14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be  14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
123      set.      set.
124    
125  15. The EBCDIC support had decayed; later updates to the code had included  15. The EBCDIC support had decayed; later updates to the code had included
126      explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a      explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
127      general tidy up of EBCDIC-related issues, and the documentation was also      general tidy up of EBCDIC-related issues, and the documentation was also
128      not quite right. There is now a test that can be run on ASCII systems to      not quite right. There is now a test that can be run on ASCII systems to
129      check some of the EBCDIC-related things (but is it not a full test).      check some of the EBCDIC-related things (but is it not a full test).
130    
131  16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting  16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
132      in a small tidy to the code.      in a small tidy to the code.
133    
134  17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.  17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
135    
136  18. If the --only-matching (-o) option in pcregrep is specified multiple  18. If the --only-matching (-o) option in pcregrep is specified multiple
137      times, each one causes appropriate output. For example, -o1 -o2 outputs the      times, each one causes appropriate output. For example, -o1 -o2 outputs the
138      substrings matched by the 1st and 2nd capturing parentheses. A separating      substrings matched by the 1st and 2nd capturing parentheses. A separating
139      string can be specified by --om-separator (default empty).      string can be specified by --om-separator (default empty).
140    
141  19. Improving the first n character searches.  19. Improving the first n character searches.
142    
143  20. Turn case lists for horizontal and vertical white space into macros so that  20. Turn case lists for horizontal and vertical white space into macros so that
144      they are defined only once.      they are defined only once.
145    
146  21. This set of changes together give more compatible Unicode case-folding  21. This set of changes together give more compatible Unicode case-folding
147      behaviour for characters that have more than one other case.      behaviour for characters that have more than one other case when UCP
148        support is available.
149    
150      (a) The Unicode property table now has offsets into a new table of sets of      (a) The Unicode property table now has offsets into a new table of sets of
151          three or more characters that are case-equivalent. The MultiStage2.py          three or more characters that are case-equivalent. The MultiStage2.py
152          script that generates these tables (the pcre_ucd.c file) now scans          script that generates these tables (the pcre_ucd.c file) now scans
153          CaseFolding.txt instead of UnicodeData.txt for character case          CaseFolding.txt instead of UnicodeData.txt for character case
154          information.          information.
155    
156      (b) The code for adding characters or ranges of characters to a character      (b) The code for adding characters or ranges of characters to a character
157          class has been abstracted into a generalized function that also handles          class has been abstracted into a generalized function that also handles
158          case-independence. In UTF-mode with UCP support, this uses the new data          case-independence. In UTF-mode with UCP support, this uses the new data
159          to handle characters with more than one other case.          to handle characters with more than one other case.
160    
161      (c) A bug that is fixed as a result of (b) is that codepoints less than 256      (c) A bug that is fixed as a result of (b) is that codepoints less than 256
162          whose other case is greater than 256 are now correctly matched          whose other case is greater than 256 are now correctly matched
163          caselessly. Previously, the high codepoint matched the low one, but not          caselessly. Previously, the high codepoint matched the low one, but not
164          vice versa.          vice versa.
165    
166      (d) The processing of \h, \H, \v, and \ in character classes now makes use      (d) The processing of \h, \H, \v, and \ in character classes now makes use
167          of the new class addition function, using character lists defined as          of the new class addition function, using character lists defined as
168          macros alongside the case definitions of 20 above.          macros alongside the case definitions of 20 above.
169    
170        (e) Caseless back references now work with characters that have more than
171            one other case.
172    
173        (f) General caseless matching of characters with more than one other case
174            is supported.
175    
176    22. Unicode character properties were updated from Unicode 6.2.0
177    
178    23. Improved CMake support under Windows. Patch by Daniel Richard G.
179    
180    24. Add support for 32-bit character strings, and UTF-32
181    
182    25. Major JIT compiler update (code refactoring and bugfixing).
183        Experimental Sparc 32 support is added.
184    
185    26. Applied a modified version of Daniel Richard G's patch to create
186        pcre.h.generic and config.h.generic by "make" instead of in the
187        PrepareRelease script.
188    
189    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
190        pcre_compile.c when checking for a zero character.
191    
192    28. Introducing a native interface for JIT. Through this interface, the compiled
193        machine code can be directly executed. The purpose of this interface is to
194        provide fast pattern matching, so several sanity checks are not performed.
195        However, feature tests are still performed. The new interface provides
196        1.4x speedup compared to the old one.
197    
198    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
199        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
200        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
201    
202    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
203        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
204        the "old" RFC 2279). Instead, it ended up passing a negative length to
205        pcre_exec().
206    
207    31. Add support for GCC's visibility feature to hide internal functions.
208    
209    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
210        "unknown -C option" after outputting 0 or 1.
211    
212    33. There is now support for generating a code coverage report for the test
213        suite in environments where gcc is the compiler and lcov is installed. This
214        is mainly for the benefit of the developers.
215    
216    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
217        unaddressable using valgrind annotations, allowing valgrind to detect
218        invalid memory accesses. This is mainly for the benefit of the developers.
219    
220    25. (*UTF) can now be used to start a pattern in any of the three libraries.
221    
222    26. Give configure error if --enable-cpp but no C++ compiler found.
223    
224    
225  Version 8.31 06-July-2012  Version 8.31 06-July-2012
226  -------------------------  -------------------------

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