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revision 1041 by ph10, Sun Sep 16 10:16:27 2012 UTC revision 1249 by zherczeg, Mon Feb 18 09:55:43 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    
62    Version 8.32 30-November-2012
63    -----------------------------
64    
65  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
66      character iterators.      character iterators.
# Line 16  Version 8.32 Line 74  Version 8.32
74    
75  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
76      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
77    
78  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
79      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
80      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
81      *PRUNE or *SKIP.      *PRUNE or *SKIP.
82    
83  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
84      Patch by Daniel Richard G.      Patch by Daniel Richard G.
85    
86  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
87      grep:      grep:
88    
89      (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.
90    
91      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
92    
93      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
94          are now supported.          are now supported.
95    
96      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
97    
98      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
99          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
100    
101      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
102    
103      (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
104          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
105          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
106    
107      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
108    
109  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
110    
111  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
112      grapheme cluster.      grapheme cluster.
113    
114  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
115      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
   
 12. Added support for PCRE_STUDY_EXTRA_NEEDED.  
116    
117  13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
118      structure could go wrong in environments where size_t is not the same size  
119    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
120        structure could go wrong in environments where size_t is not the same size
121      as int.      as int.
122    
123  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
124      set.      set.
125    
126  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
127      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
128      general tidy up of EBCDIC-related issues, and the documentation was also      general tidy up of EBCDIC-related issues, and the documentation was also
129      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
130      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).
131    
132  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
133      in a small tidy to the code.      in a small tidy to the code.
134    
135  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.
136    
137  18. If the --only-matching (-o) option in pcregrep is specified multiple  18. If the --only-matching (-o) option in pcregrep is specified multiple
138      times, each one causes appropriate output. For example, -o1 -o2 outputs the      times, each one causes appropriate output. For example, -o1 -o2 outputs the
139      substrings matched by the 1st and 2nd capturing parentheses. A separating      substrings matched by the 1st and 2nd capturing parentheses. A separating
140      string can be specified by --om-separator (default empty).      string can be specified by --om-separator (default empty).
141    
142  19. Improving the first n character searches.  19. Improving the first n character searches.
143    
144  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
145      they are defined only once.      they are defined only once.
146    
147    21. This set of changes together give more compatible Unicode case-folding
148        behaviour for characters that have more than one other case when UCP
149        support is available.
150    
151        (a) The Unicode property table now has offsets into a new table of sets of
152            three or more characters that are case-equivalent. The MultiStage2.py
153            script that generates these tables (the pcre_ucd.c file) now scans
154            CaseFolding.txt instead of UnicodeData.txt for character case
155            information.
156    
157        (b) The code for adding characters or ranges of characters to a character
158            class has been abstracted into a generalized function that also handles
159            case-independence. In UTF-mode with UCP support, this uses the new data
160            to handle characters with more than one other case.
161    
162        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
163            whose other case is greater than 256 are now correctly matched
164            caselessly. Previously, the high codepoint matched the low one, but not
165            vice versa.
166    
167        (d) The processing of \h, \H, \v, and \ in character classes now makes use
168            of the new class addition function, using character lists defined as
169            macros alongside the case definitions of 20 above.
170    
171        (e) Caseless back references now work with characters that have more than
172            one other case.
173    
174        (f) General caseless matching of characters with more than one other case
175            is supported.
176    
177    22. Unicode character properties were updated from Unicode 6.2.0
178    
179    23. Improved CMake support under Windows. Patch by Daniel Richard G.
180    
181    24. Add support for 32-bit character strings, and UTF-32
182    
183    25. Major JIT compiler update (code refactoring and bugfixing).
184        Experimental Sparc 32 support is added.
185    
186    26. Applied a modified version of Daniel Richard G's patch to create
187        pcre.h.generic and config.h.generic by "make" instead of in the
188        PrepareRelease script.
189    
190    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
191        pcre_compile.c when checking for a zero character.
192    
193    28. Introducing a native interface for JIT. Through this interface, the compiled
194        machine code can be directly executed. The purpose of this interface is to
195        provide fast pattern matching, so several sanity checks are not performed.
196        However, feature tests are still performed. The new interface provides
197        1.4x speedup compared to the old one.
198    
199    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
200        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
201        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
202    
203    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
204        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
205        the "old" RFC 2279). Instead, it ended up passing a negative length to
206        pcre_exec().
207    
208    31. Add support for GCC's visibility feature to hide internal functions.
209    
210    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
211        "unknown -C option" after outputting 0 or 1.
212    
213    33. There is now support for generating a code coverage report for the test
214        suite in environments where gcc is the compiler and lcov is installed. This
215        is mainly for the benefit of the developers.
216    
217    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
218        unaddressable using valgrind annotations, allowing valgrind to detect
219        invalid memory accesses. This is mainly for the benefit of the developers.
220    
221    25. (*UTF) can now be used to start a pattern in any of the three libraries.
222    
223    26. Give configure error if --enable-cpp but no C++ compiler found.
224    
225    
226  Version 8.31 06-July-2012  Version 8.31 06-July-2012
227  -------------------------  -------------------------

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