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revision 977 by zherczeg, Sun Jun 17 06:20:52 2012 UTC revision 1322 by zherczeg, Wed May 1 19:42:31 2013 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.31 02-June-2012  Version 8.33 28-April-2013
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    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
136        blocking (*UTF) etc.
137    
138    36. In the interpreter, maximizing pattern repetitions for characters and
139        character types now use tail recursion, which reduces stack usage.
140    
141    37. The value of the max lookbehind was not correctly preserved if a compiled
142        and saved regex was reloaded on a host of different endianness.
143    
144    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
145        of the compiled pattern block, expand the flags field from 16 to 32 bits
146        because it was almost full.
147    
148    39. Try madvise first before posix_madvise.
149    
150    
151    Version 8.32 30-November-2012
152    -----------------------------
153    
154    1.  Improved JIT compiler optimizations for first character search and single
155        character iterators.
156    
157    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
158        Patch by Daniel Richard G.
159    
160    3.  Single character iterator optimizations in the JIT compiler.
161    
162    4.  Improved JIT compiler optimizations for character ranges.
163    
164    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
165        Reported by Giuseppe D'Angelo.
166    
167    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
168        of a line, was being set incorrectly in cases where .* appeared inside
169        atomic brackets at the start of a pattern, or where there was a subsequent
170        *PRUNE or *SKIP.
171    
172    7.  Improved instruction cache flush for POWER/PowerPC.
173        Patch by Daniel Richard G.
174    
175    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
176        grep:
177    
178        (a) There is now no limit to the number of patterns to be matched.
179    
180        (b) An error is given if a pattern is too long.
181    
182        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
183            are now supported.
184    
185        (d) --exclude-from and --include-from (multiple use) have been added.
186    
187        (e) Exclusions and inclusions now apply to all files and directories, not
188            just to those obtained from scanning a directory recursively.
189    
190        (f) Multiple uses of -f and --file-list are now supported.
191    
192        (g) In a Windows environment, the default for -d has been changed from
193            "read" (the GNU grep default) to "skip", because otherwise the presence
194            of a directory in the file list provokes an error.
195    
196        (h) The documentation has been revised and clarified in places.
197    
198    9.  Improve the matching speed of capturing brackets.
199    
200    10. Changed the meaning of \X so that it now matches a Unicode extended
201        grapheme cluster.
202    
203    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
204        out POSIX threads when JIT support is configured.
205    
206    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
207    
208    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
209        structure could go wrong in environments where size_t is not the same size
210        as int.
211    
212    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
213        set.
214    
215    15. The EBCDIC support had decayed; later updates to the code had included
216        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
217        general tidy up of EBCDIC-related issues, and the documentation was also
218        not quite right. There is now a test that can be run on ASCII systems to
219        check some of the EBCDIC-related things (but is it not a full test).
220    
221    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
222        in a small tidy to the code.
223    
224    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
225    
226    18. If the --only-matching (-o) option in pcregrep is specified multiple
227        times, each one causes appropriate output. For example, -o1 -o2 outputs the
228        substrings matched by the 1st and 2nd capturing parentheses. A separating
229        string can be specified by --om-separator (default empty).
230    
231    19. Improving the first n character searches.
232    
233    20. Turn case lists for horizontal and vertical white space into macros so that
234        they are defined only once.
235    
236    21. This set of changes together give more compatible Unicode case-folding
237        behaviour for characters that have more than one other case when UCP
238        support is available.
239    
240        (a) The Unicode property table now has offsets into a new table of sets of
241            three or more characters that are case-equivalent. The MultiStage2.py
242            script that generates these tables (the pcre_ucd.c file) now scans
243            CaseFolding.txt instead of UnicodeData.txt for character case
244            information.
245    
246        (b) The code for adding characters or ranges of characters to a character
247            class has been abstracted into a generalized function that also handles
248            case-independence. In UTF-mode with UCP support, this uses the new data
249            to handle characters with more than one other case.
250    
251        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
252            whose other case is greater than 256 are now correctly matched
253            caselessly. Previously, the high codepoint matched the low one, but not
254            vice versa.
255    
256        (d) The processing of \h, \H, \v, and \ in character classes now makes use
257            of the new class addition function, using character lists defined as
258            macros alongside the case definitions of 20 above.
259    
260        (e) Caseless back references now work with characters that have more than
261            one other case.
262    
263        (f) General caseless matching of characters with more than one other case
264            is supported.
265    
266    22. Unicode character properties were updated from Unicode 6.2.0
267    
268    23. Improved CMake support under Windows. Patch by Daniel Richard G.
269    
270    24. Add support for 32-bit character strings, and UTF-32
271    
272    25. Major JIT compiler update (code refactoring and bugfixing).
273        Experimental Sparc 32 support is added.
274    
275    26. Applied a modified version of Daniel Richard G's patch to create
276        pcre.h.generic and config.h.generic by "make" instead of in the
277        PrepareRelease script.
278    
279    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
280        pcre_compile.c when checking for a zero character.
281    
282    28. Introducing a native interface for JIT. Through this interface, the compiled
283        machine code can be directly executed. The purpose of this interface is to
284        provide fast pattern matching, so several sanity checks are not performed.
285        However, feature tests are still performed. The new interface provides
286        1.4x speedup compared to the old one.
287    
288    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
289        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
290        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
291    
292    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
293        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
294        the "old" RFC 2279). Instead, it ended up passing a negative length to
295        pcre_exec().
296    
297    31. Add support for GCC's visibility feature to hide internal functions.
298    
299    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
300        "unknown -C option" after outputting 0 or 1.
301    
302    33. There is now support for generating a code coverage report for the test
303        suite in environments where gcc is the compiler and lcov is installed. This
304        is mainly for the benefit of the developers.
305    
306    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
307        unaddressable using valgrind annotations, allowing valgrind to detect
308        invalid memory accesses. This is mainly for the benefit of the developers.
309    
310    25. (*UTF) can now be used to start a pattern in any of the three libraries.
311    
312    26. Give configure error if --enable-cpp but no C++ compiler found.
313    
314    
315    Version 8.31 06-July-2012
316  -------------------------  -------------------------
317    
318  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
# Line 132  Version 8.31 02-June-2012 Line 443  Version 8.31 02-June-2012
443    
444  37. Optimizing single character iterators in JIT.  37. Optimizing single character iterators in JIT.
445    
446    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
447        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
448        codepoints that are too big for the mode are faulted, and in a UTF mode,
449        disallowed codepoints are also faulted.
450    
451    39. If PCRE was compiled with UTF support, in three places in the DFA
452        matcher there was code that should only have been obeyed in UTF mode, but
453        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
454        processing when bytes with values greater than 127 were present. In 16-bit
455        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
456        both cases the values are those that cannot be the first data item in a UTF
457        character. The three items that might have provoked this were recursions,
458        possessively repeated groups, and atomic groups.
459    
460    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
461        and pcregrep, because some OS require shared objects to be explicitly
462        passed to ld, causing the link step to fail if they are not.
463    
464    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
465        mode, patterns that started with \h* or \R* might be incorrectly matched.
466    
467    
468  Version 8.30 04-February-2012  Version 8.30 04-February-2012
469  -----------------------------  -----------------------------

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