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revision 1022 by ph10, Tue Aug 28 12:28:15 2012 UTC revision 1306 by zherczeg, Mon Apr 1 17:04:17 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    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
84        which points out that "non characters" are not "characters that may not
85        appear in Unicode strings" but rather "characters that are reserved for
86        internal use and have only local meaning".
87    
88    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
89        there was a conditional group that depended on an assertion, if the
90        assertion was false, the callout that immediately followed the alternation
91        in the condition was skipped when pcre_exec() was used for matching.
92    
93    23. Allow an explicit callout to be inserted before an assertion that is the
94        condition for a conditional group, for compatibility with automatic
95        callouts, which always insert a callout at this point.
96    
97    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
98        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
99    
100    25. (*PRUNE) is now supported by the JIT compiler.
101    
102    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
103    
104    27. Fix the case where there are two or more SKIPs with arguments that may be
105        ignored.
106    
107    28. (*SKIP) is now supported by the JIT compiler.
108    
109    29. (*THEN) is now supported by the JIT compiler.
110    
111    30. Update RunTest with additional test selector options.
112    
113    31. The way PCRE handles backtracking verbs has been changed in two ways.
114    
115        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
116        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
117        backtracking. In some cases this makes it more Perl-compatible, but Perl's
118        rather obscure rules do not always do the same thing.
119    
120        (2) Previously, backtracking verbs were confined within assertions. This is
121        no longer the case for positive assertions, except for (*ACCEPT). Again,
122        this sometimes improves Perl compatibility, and sometimes does not.
123    
124    32. A number of tests that were in test 2 because Perl did things differently
125        have been moved to test 1, because either Perl or PCRE has changed, and
126        these tests are now compatible.
127    
128    32. Control verbs are handled in the same way in JIT and interpreter.
129    
130    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
131        contained a forward subroutine reference caused a compile error.
132    
133    34. Auto-detect and optimize limited repetitions in JIT.
134    
135    
136    Version 8.32 30-November-2012
137    -----------------------------
138    
139  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
140      character iterators.      character iterators.
# Line 16  Version 8.32 Line 148  Version 8.32
148    
149  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
150      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
151    
152  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
153      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
154      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
155      *PRUNE or *SKIP.      *PRUNE or *SKIP.
156    
157  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
158      Patch by Daniel Richard G.      Patch by Daniel Richard G.
159    
160  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
161      grep:      grep:
162    
163      (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.
164    
165      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
166    
167      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
168          are now supported.          are now supported.
169    
170      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
171    
172      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
173          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
174    
175      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
176    
177      (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
178          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
179          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
180    
181      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
182    
183  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
184    
185  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
186      grapheme cluster.      grapheme cluster.
187    
188  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
189      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
190    
191  12. Added support for PCRE_STUDY_EXTRA_NEEDED.  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
192    
193    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
194        structure could go wrong in environments where size_t is not the same size
195        as int.
196    
197    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
198        set.
199    
200    15. The EBCDIC support had decayed; later updates to the code had included
201        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
202        general tidy up of EBCDIC-related issues, and the documentation was also
203        not quite right. There is now a test that can be run on ASCII systems to
204        check some of the EBCDIC-related things (but is it not a full test).
205    
206    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
207        in a small tidy to the code.
208    
209    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
210    
211    18. If the --only-matching (-o) option in pcregrep is specified multiple
212        times, each one causes appropriate output. For example, -o1 -o2 outputs the
213        substrings matched by the 1st and 2nd capturing parentheses. A separating
214        string can be specified by --om-separator (default empty).
215    
216    19. Improving the first n character searches.
217    
218    20. Turn case lists for horizontal and vertical white space into macros so that
219        they are defined only once.
220    
221    21. This set of changes together give more compatible Unicode case-folding
222        behaviour for characters that have more than one other case when UCP
223        support is available.
224    
225        (a) The Unicode property table now has offsets into a new table of sets of
226            three or more characters that are case-equivalent. The MultiStage2.py
227            script that generates these tables (the pcre_ucd.c file) now scans
228            CaseFolding.txt instead of UnicodeData.txt for character case
229            information.
230    
231        (b) The code for adding characters or ranges of characters to a character
232            class has been abstracted into a generalized function that also handles
233            case-independence. In UTF-mode with UCP support, this uses the new data
234            to handle characters with more than one other case.
235    
236        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
237            whose other case is greater than 256 are now correctly matched
238            caselessly. Previously, the high codepoint matched the low one, but not
239            vice versa.
240    
241        (d) The processing of \h, \H, \v, and \ in character classes now makes use
242            of the new class addition function, using character lists defined as
243            macros alongside the case definitions of 20 above.
244    
245        (e) Caseless back references now work with characters that have more than
246            one other case.
247    
248        (f) General caseless matching of characters with more than one other case
249            is supported.
250    
251    22. Unicode character properties were updated from Unicode 6.2.0
252    
253    23. Improved CMake support under Windows. Patch by Daniel Richard G.
254    
255    24. Add support for 32-bit character strings, and UTF-32
256    
257    25. Major JIT compiler update (code refactoring and bugfixing).
258        Experimental Sparc 32 support is added.
259    
260    26. Applied a modified version of Daniel Richard G's patch to create
261        pcre.h.generic and config.h.generic by "make" instead of in the
262        PrepareRelease script.
263    
264    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
265        pcre_compile.c when checking for a zero character.
266    
267    28. Introducing a native interface for JIT. Through this interface, the compiled
268        machine code can be directly executed. The purpose of this interface is to
269        provide fast pattern matching, so several sanity checks are not performed.
270        However, feature tests are still performed. The new interface provides
271        1.4x speedup compared to the old one.
272    
273    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
274        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
275        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
276    
277    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
278        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
279        the "old" RFC 2279). Instead, it ended up passing a negative length to
280        pcre_exec().
281    
282    31. Add support for GCC's visibility feature to hide internal functions.
283    
284    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
285        "unknown -C option" after outputting 0 or 1.
286    
287    33. There is now support for generating a code coverage report for the test
288        suite in environments where gcc is the compiler and lcov is installed. This
289        is mainly for the benefit of the developers.
290    
291    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
292        unaddressable using valgrind annotations, allowing valgrind to detect
293        invalid memory accesses. This is mainly for the benefit of the developers.
294    
295    25. (*UTF) can now be used to start a pattern in any of the three libraries.
296    
297    26. Give configure error if --enable-cpp but no C++ compiler found.
298    
299    
300  Version 8.31 06-July-2012  Version 8.31 06-July-2012

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