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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.31  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    
26    Version 8.32 30-November-2012
27  -----------------------------  -----------------------------
28    
29    1.  Improved JIT compiler optimizations for first character search and single
30        character iterators.
31    
32    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
33        Patch by Daniel Richard G.
34    
35    3.  Single character iterator optimizations in the JIT compiler.
36    
37    4.  Improved JIT compiler optimizations for character ranges.
38    
39    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
40        Reported by Giuseppe D'Angelo.
41    
42    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
43        of a line, was being set incorrectly in cases where .* appeared inside
44        atomic brackets at the start of a pattern, or where there was a subsequent
45        *PRUNE or *SKIP.
46    
47    7.  Improved instruction cache flush for POWER/PowerPC.
48        Patch by Daniel Richard G.
49    
50    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
51        grep:
52    
53        (a) There is now no limit to the number of patterns to be matched.
54    
55        (b) An error is given if a pattern is too long.
56    
57        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
58            are now supported.
59    
60        (d) --exclude-from and --include-from (multiple use) have been added.
61    
62        (e) Exclusions and inclusions now apply to all files and directories, not
63            just to those obtained from scanning a directory recursively.
64    
65        (f) Multiple uses of -f and --file-list are now supported.
66    
67        (g) In a Windows environment, the default for -d has been changed from
68            "read" (the GNU grep default) to "skip", because otherwise the presence
69            of a directory in the file list provokes an error.
70    
71        (h) The documentation has been revised and clarified in places.
72    
73    9.  Improve the matching speed of capturing brackets.
74    
75    10. Changed the meaning of \X so that it now matches a Unicode extended
76        grapheme cluster.
77    
78    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
79        out POSIX threads when JIT support is configured.
80    
81    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
82    
83    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
84        structure could go wrong in environments where size_t is not the same size
85        as int.
86    
87    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
88        set.
89    
90    15. The EBCDIC support had decayed; later updates to the code had included
91        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
92        general tidy up of EBCDIC-related issues, and the documentation was also
93        not quite right. There is now a test that can be run on ASCII systems to
94        check some of the EBCDIC-related things (but is it not a full test).
95    
96    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
97        in a small tidy to the code.
98    
99    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
100    
101    18. If the --only-matching (-o) option in pcregrep is specified multiple
102        times, each one causes appropriate output. For example, -o1 -o2 outputs the
103        substrings matched by the 1st and 2nd capturing parentheses. A separating
104        string can be specified by --om-separator (default empty).
105    
106    19. Improving the first n character searches.
107    
108    20. Turn case lists for horizontal and vertical white space into macros so that
109        they are defined only once.
110    
111    21. This set of changes together give more compatible Unicode case-folding
112        behaviour for characters that have more than one other case when UCP
113        support is available.
114    
115        (a) The Unicode property table now has offsets into a new table of sets of
116            three or more characters that are case-equivalent. The MultiStage2.py
117            script that generates these tables (the pcre_ucd.c file) now scans
118            CaseFolding.txt instead of UnicodeData.txt for character case
119            information.
120    
121        (b) The code for adding characters or ranges of characters to a character
122            class has been abstracted into a generalized function that also handles
123            case-independence. In UTF-mode with UCP support, this uses the new data
124            to handle characters with more than one other case.
125    
126        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
127            whose other case is greater than 256 are now correctly matched
128            caselessly. Previously, the high codepoint matched the low one, but not
129            vice versa.
130    
131        (d) The processing of \h, \H, \v, and \ in character classes now makes use
132            of the new class addition function, using character lists defined as
133            macros alongside the case definitions of 20 above.
134    
135        (e) Caseless back references now work with characters that have more than
136            one other case.
137    
138        (f) General caseless matching of characters with more than one other case
139            is supported.
140    
141    22. Unicode character properties were updated from Unicode 6.2.0
142    
143    23. Improved CMake support under Windows. Patch by Daniel Richard G.
144    
145    24. Add support for 32-bit character strings, and UTF-32
146    
147    25. Major JIT compiler update (code refactoring and bugfixing).
148        Experimental Sparc 32 support is added.
149    
150    26. Applied a modified version of Daniel Richard G's patch to create
151        pcre.h.generic and config.h.generic by "make" instead of in the
152        PrepareRelease script.
153    
154    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
155        pcre_compile.c when checking for a zero character.
156    
157    28. Introducing a native interface for JIT. Through this interface, the compiled
158        machine code can be directly executed. The purpose of this interface is to
159        provide fast pattern matching, so several sanity checks are not performed.
160        However, feature tests are still performed. The new interface provides
161        1.4x speedup compared to the old one.
162    
163    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
164        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
165        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
166    
167    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
168        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
169        the "old" RFC 2279). Instead, it ended up passing a negative length to
170        pcre_exec().
171    
172    31. Add support for GCC's visibility feature to hide internal functions.
173    
174    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
175        "unknown -C option" after outputting 0 or 1.
176    
177    33. There is now support for generating a code coverage report for the test
178        suite in environments where gcc is the compiler and lcov is installed. This
179        is mainly for the benefit of the developers.
180    
181    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
182        unaddressable using valgrind annotations, allowing valgrind to detect
183        invalid memory accesses. This is mainly for the benefit of the developers.
184    
185    25. (*UTF) can now be used to start a pattern in any of the three libraries.
186    
187    26. Give configure error if --enable-cpp but no C++ compiler found.
188    
189    
190    Version 8.31 06-July-2012
191    -------------------------
192    
193  1.  Fixing a wrong JIT test case and some compiler warnings.  1.  Fixing a wrong JIT test case and some compiler warnings.
194    
195  2.  Removed a bashism from the RunTest script.  2.  Removed a bashism from the RunTest script.
196    
197  3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied  3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
198      to unsigned type, result still unsigned" that was given by an MS compiler      to unsigned type, result still unsigned" that was given by an MS compiler
199      on encountering the code "-sizeof(xxx)".      on encountering the code "-sizeof(xxx)".
200    
201    4.  Partial matching support is added to the JIT compiler.
202    
203    5.  Fixed several bugs concerned with partial matching of items that consist
204        of more than one character:
205    
206        (a) /^(..)\1/ did not partially match "aba" because checking references was
207            done on an "all or nothing" basis. This also applied to repeated
208            references.
209    
210        (b) \R did not give a hard partial match if \r was found at the end of the
211            subject.
212    
213        (c) \X did not give a hard partial match after matching one or more
214            characters at the end of the subject.
215    
216        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
217            a partial match for the string "\r".
218    
219        (e) When newline was set to CRLF, the metacharacter "." did not recognize
220            a partial match for a CR character at the end of the subject string.
221    
222    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
223        running pcretest, the text "(JIT)" added to the output whenever JIT is
224        actually used to run the match.
225    
226    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
227        or /S+[+] with a digit between 1 and 7.
228    
229    8.  OP_NOT now supports any UTF character not just single-byte ones.
230    
231    9.  (*MARK) control verb is now supported by the JIT compiler.
232    
233    10. The command "./RunTest list" lists the available tests without actually
234        running any of them. (Because I keep forgetting what they all are.)
235    
236    11. Add PCRE_INFO_MAXLOOKBEHIND.
237    
238    12. Applied a (slightly modified) user-supplied patch that improves performance
239        when the heap is used for recursion (compiled with --disable-stack-for-
240        recursion). Instead of malloc and free for each heap frame each time a
241        logical recursion happens, frames are retained on a chain and re-used where
242        possible. This sometimes gives as much as 30% improvement.
243    
244    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
245        call.
246    
247    14. As documented, (*COMMIT) is now confined to within a positive assertion.
248    
249    15. It is now possible to link pcretest with libedit as an alternative to
250        libreadline.
251    
252    16. (*COMMIT) control verb is now supported by the JIT compiler.
253    
254    17. The Unicode data tables have been updated to Unicode 6.1.0.
255    
256    18. Added --file-list option to pcregrep.
257    
258    19. Added binary file support to pcregrep, including the -a, --binary-files,
259        -I, and --text options.
260    
261    20. The madvise function is renamed for posix_madvise for QNX compatibility
262        reasons. Fixed by Giuseppe D'Angelo.
263    
264    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
265    
266    22. Changed the option for creating symbolic links for 16-bit man pages from
267        -s to -sf so that re-installing does not cause issues.
268    
269    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
270    
271    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
272        matches in certain environments (the workspace was not being correctly
273        retained). Also added to pcre_dfa_exec() a simple plausibility check on
274        some of the workspace data at the beginning of a restart.
275    
276    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
277        was not doing so when it should - probably a typo introduced by SVN 528
278        (change 8.10/14).
279    
280    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
281        \w+ when the character tables indicated that \x{c4} was a word character.
282        There were several related cases, all because the tests for doing a table
283        lookup were testing for characters less than 127 instead of 255.
284    
285    27. If a pattern contains capturing parentheses that are not used in a match,
286        their slots in the ovector are set to -1. For those that are higher than
287        any matched groups, this happens at the end of processing. In the case when
288        there were back references that the ovector was too small to contain
289        (causing temporary malloc'd memory to be used during matching), and the
290        highest capturing number was not used, memory off the end of the ovector
291        was incorrectly being set to -1. (It was using the size of the temporary
292        memory instead of the true size.)
293    
294    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
295        ovector size, it uses memory at the end of the block that it has got.
296    
297    29. Check for an overlong MARK name and give an error at compile time. The
298        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
299    
300    30. JIT compiler update.
301    
302    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
303        Rill for the patch.
304    
305    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
306    
307    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
308    
309    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
310        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
311        was enabled.
312    
313    35. Improve JIT code generation for greedy plus quantifier.
314    
315    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
316        1 to "aa" instead of to an empty string. The bug affected repeated groups
317        that could potentially match an empty string.
318    
319    37. Optimizing single character iterators in JIT.
320    
321    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
322        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
323        codepoints that are too big for the mode are faulted, and in a UTF mode,
324        disallowed codepoints are also faulted.
325    
326    39. If PCRE was compiled with UTF support, in three places in the DFA
327        matcher there was code that should only have been obeyed in UTF mode, but
328        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
329        processing when bytes with values greater than 127 were present. In 16-bit
330        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
331        both cases the values are those that cannot be the first data item in a UTF
332        character. The three items that might have provoked this were recursions,
333        possessively repeated groups, and atomic groups.
334    
335    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
336        and pcregrep, because some OS require shared objects to be explicitly
337        passed to ld, causing the link step to fail if they are not.
338    
339    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
340        mode, patterns that started with \h* or \R* might be incorrectly matched.
341    
342    
343  Version 8.30 04-February-2012  Version 8.30 04-February-2012
344  -----------------------------  -----------------------------

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