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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.22  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. Experimental support of (*SKIP) backtracking verb in the JIT compiler.
108    
109    29. Experimental support of (*THEN) backtracking verb in the JIT compiler.
110    
111    30. Update RunTest with additional test selector options.
112    
113    
114    Version 8.32 30-November-2012
115    -----------------------------
116    
117    1.  Improved JIT compiler optimizations for first character search and single
118        character iterators.
119    
120    2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
121        Patch by Daniel Richard G.
122    
123    3.  Single character iterator optimizations in the JIT compiler.
124    
125    4.  Improved JIT compiler optimizations for character ranges.
126    
127    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
128        Reported by Giuseppe D'Angelo.
129    
130    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
131        of a line, was being set incorrectly in cases where .* appeared inside
132        atomic brackets at the start of a pattern, or where there was a subsequent
133        *PRUNE or *SKIP.
134    
135    7.  Improved instruction cache flush for POWER/PowerPC.
136        Patch by Daniel Richard G.
137    
138    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
139        grep:
140    
141        (a) There is now no limit to the number of patterns to be matched.
142    
143        (b) An error is given if a pattern is too long.
144    
145        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
146            are now supported.
147    
148        (d) --exclude-from and --include-from (multiple use) have been added.
149    
150        (e) Exclusions and inclusions now apply to all files and directories, not
151            just to those obtained from scanning a directory recursively.
152    
153        (f) Multiple uses of -f and --file-list are now supported.
154    
155        (g) In a Windows environment, the default for -d has been changed from
156            "read" (the GNU grep default) to "skip", because otherwise the presence
157            of a directory in the file list provokes an error.
158    
159        (h) The documentation has been revised and clarified in places.
160    
161    9.  Improve the matching speed of capturing brackets.
162    
163    10. Changed the meaning of \X so that it now matches a Unicode extended
164        grapheme cluster.
165    
166    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
167        out POSIX threads when JIT support is configured.
168    
169    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
170    
171    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
172        structure could go wrong in environments where size_t is not the same size
173        as int.
174    
175    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
176        set.
177    
178    15. The EBCDIC support had decayed; later updates to the code had included
179        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
180        general tidy up of EBCDIC-related issues, and the documentation was also
181        not quite right. There is now a test that can be run on ASCII systems to
182        check some of the EBCDIC-related things (but is it not a full test).
183    
184    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
185        in a small tidy to the code.
186    
187    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
188    
189    18. If the --only-matching (-o) option in pcregrep is specified multiple
190        times, each one causes appropriate output. For example, -o1 -o2 outputs the
191        substrings matched by the 1st and 2nd capturing parentheses. A separating
192        string can be specified by --om-separator (default empty).
193    
194    19. Improving the first n character searches.
195    
196    20. Turn case lists for horizontal and vertical white space into macros so that
197        they are defined only once.
198    
199    21. This set of changes together give more compatible Unicode case-folding
200        behaviour for characters that have more than one other case when UCP
201        support is available.
202    
203        (a) The Unicode property table now has offsets into a new table of sets of
204            three or more characters that are case-equivalent. The MultiStage2.py
205            script that generates these tables (the pcre_ucd.c file) now scans
206            CaseFolding.txt instead of UnicodeData.txt for character case
207            information.
208    
209        (b) The code for adding characters or ranges of characters to a character
210            class has been abstracted into a generalized function that also handles
211            case-independence. In UTF-mode with UCP support, this uses the new data
212            to handle characters with more than one other case.
213    
214        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
215            whose other case is greater than 256 are now correctly matched
216            caselessly. Previously, the high codepoint matched the low one, but not
217            vice versa.
218    
219        (d) The processing of \h, \H, \v, and \ in character classes now makes use
220            of the new class addition function, using character lists defined as
221            macros alongside the case definitions of 20 above.
222    
223        (e) Caseless back references now work with characters that have more than
224            one other case.
225    
226        (f) General caseless matching of characters with more than one other case
227            is supported.
228    
229    22. Unicode character properties were updated from Unicode 6.2.0
230    
231    23. Improved CMake support under Windows. Patch by Daniel Richard G.
232    
233    24. Add support for 32-bit character strings, and UTF-32
234    
235    25. Major JIT compiler update (code refactoring and bugfixing).
236        Experimental Sparc 32 support is added.
237    
238    26. Applied a modified version of Daniel Richard G's patch to create
239        pcre.h.generic and config.h.generic by "make" instead of in the
240        PrepareRelease script.
241    
242    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
243        pcre_compile.c when checking for a zero character.
244    
245    28. Introducing a native interface for JIT. Through this interface, the compiled
246        machine code can be directly executed. The purpose of this interface is to
247        provide fast pattern matching, so several sanity checks are not performed.
248        However, feature tests are still performed. The new interface provides
249        1.4x speedup compared to the old one.
250    
251    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
252        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
253        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
254    
255    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
256        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
257        the "old" RFC 2279). Instead, it ended up passing a negative length to
258        pcre_exec().
259    
260    31. Add support for GCC's visibility feature to hide internal functions.
261    
262    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
263        "unknown -C option" after outputting 0 or 1.
264    
265    33. There is now support for generating a code coverage report for the test
266        suite in environments where gcc is the compiler and lcov is installed. This
267        is mainly for the benefit of the developers.
268    
269    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
270        unaddressable using valgrind annotations, allowing valgrind to detect
271        invalid memory accesses. This is mainly for the benefit of the developers.
272    
273    25. (*UTF) can now be used to start a pattern in any of the three libraries.
274    
275    26. Give configure error if --enable-cpp but no C++ compiler found.
276    
277    
278    Version 8.31 06-July-2012
279    -------------------------
280    
281    1.  Fixing a wrong JIT test case and some compiler warnings.
282    
283    2.  Removed a bashism from the RunTest script.
284    
285    3.  Add a cast to pcre_exec.c to fix the warning "unary minus operator applied
286        to unsigned type, result still unsigned" that was given by an MS compiler
287        on encountering the code "-sizeof(xxx)".
288    
289    4.  Partial matching support is added to the JIT compiler.
290    
291    5.  Fixed several bugs concerned with partial matching of items that consist
292        of more than one character:
293    
294        (a) /^(..)\1/ did not partially match "aba" because checking references was
295            done on an "all or nothing" basis. This also applied to repeated
296            references.
297    
298        (b) \R did not give a hard partial match if \r was found at the end of the
299            subject.
300    
301        (c) \X did not give a hard partial match after matching one or more
302            characters at the end of the subject.
303    
304        (d) When newline was set to CRLF, a pattern such as /a$/ did not recognize
305            a partial match for the string "\r".
306    
307        (e) When newline was set to CRLF, the metacharacter "." did not recognize
308            a partial match for a CR character at the end of the subject string.
309    
310    6.  If JIT is requested using /S++ or -s++ (instead of just /S+ or -s+) when
311        running pcretest, the text "(JIT)" added to the output whenever JIT is
312        actually used to run the match.
313    
314    7.  Individual JIT compile options can be set in pcretest by following -s+[+]
315        or /S+[+] with a digit between 1 and 7.
316    
317    8.  OP_NOT now supports any UTF character not just single-byte ones.
318    
319    9.  (*MARK) control verb is now supported by the JIT compiler.
320    
321    10. The command "./RunTest list" lists the available tests without actually
322        running any of them. (Because I keep forgetting what they all are.)
323    
324    11. Add PCRE_INFO_MAXLOOKBEHIND.
325    
326    12. Applied a (slightly modified) user-supplied patch that improves performance
327        when the heap is used for recursion (compiled with --disable-stack-for-
328        recursion). Instead of malloc and free for each heap frame each time a
329        logical recursion happens, frames are retained on a chain and re-used where
330        possible. This sometimes gives as much as 30% improvement.
331    
332    13. As documented, (*COMMIT) is now confined to within a recursive subpattern
333        call.
334    
335    14. As documented, (*COMMIT) is now confined to within a positive assertion.
336    
337    15. It is now possible to link pcretest with libedit as an alternative to
338        libreadline.
339    
340    16. (*COMMIT) control verb is now supported by the JIT compiler.
341    
342    17. The Unicode data tables have been updated to Unicode 6.1.0.
343    
344    18. Added --file-list option to pcregrep.
345    
346    19. Added binary file support to pcregrep, including the -a, --binary-files,
347        -I, and --text options.
348    
349    20. The madvise function is renamed for posix_madvise for QNX compatibility
350        reasons. Fixed by Giuseppe D'Angelo.
351    
352    21. Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler.
353    
354    22. Changed the option for creating symbolic links for 16-bit man pages from
355        -s to -sf so that re-installing does not cause issues.
356    
357    23. Support PCRE_NO_START_OPTIMIZE in JIT as (*MARK) support requires it.
358    
359    24. Fixed a very old bug in pcretest that caused errors with restarted DFA
360        matches in certain environments (the workspace was not being correctly
361        retained). Also added to pcre_dfa_exec() a simple plausibility check on
362        some of the workspace data at the beginning of a restart.
363    
364    25. \s*\R was auto-possessifying the \s* when it should not, whereas \S*\R
365        was not doing so when it should - probably a typo introduced by SVN 528
366        (change 8.10/14).
367    
368    26. When PCRE_UCP was not set, \w+\x{c4} was incorrectly auto-possessifying the
369        \w+ when the character tables indicated that \x{c4} was a word character.
370        There were several related cases, all because the tests for doing a table
371        lookup were testing for characters less than 127 instead of 255.
372    
373    27. If a pattern contains capturing parentheses that are not used in a match,
374        their slots in the ovector are set to -1. For those that are higher than
375        any matched groups, this happens at the end of processing. In the case when
376        there were back references that the ovector was too small to contain
377        (causing temporary malloc'd memory to be used during matching), and the
378        highest capturing number was not used, memory off the end of the ovector
379        was incorrectly being set to -1. (It was using the size of the temporary
380        memory instead of the true size.)
381    
382    28. To catch bugs like 27 using valgrind, when pcretest is asked to specify an
383        ovector size, it uses memory at the end of the block that it has got.
384    
385    29. Check for an overlong MARK name and give an error at compile time. The
386        limit is 255 for the 8-bit library and 65535 for the 16-bit library.
387    
388    30. JIT compiler update.
389    
390    31. JIT is now supported on jailbroken iOS devices. Thanks for Ruiger
391        Rill for the patch.
392    
393    32. Put spaces around SLJIT_PRINT_D in the JIT compiler. Required by CXX11.
394    
395    33. Variable renamings in the PCRE-JIT compiler. No functionality change.
396    
397    34. Fixed typos in pcregrep: in two places there was SUPPORT_LIBZ2 instead of
398        SUPPORT_LIBBZ2. This caused a build problem when bzip2 but not gzip (zlib)
399        was enabled.
400    
401    35. Improve JIT code generation for greedy plus quantifier.
402    
403    36. When /((?:a?)*)*c/ or /((?>a?)*)*c/ was matched against "aac", it set group
404        1 to "aa" instead of to an empty string. The bug affected repeated groups
405        that could potentially match an empty string.
406    
407    37. Optimizing single character iterators in JIT.
408    
409    38. Wide characters specified with \uxxxx in JavaScript mode are now subject to
410        the same checks as \x{...} characters in non-JavaScript mode. Specifically,
411        codepoints that are too big for the mode are faulted, and in a UTF mode,
412        disallowed codepoints are also faulted.
413    
414    39. If PCRE was compiled with UTF support, in three places in the DFA
415        matcher there was code that should only have been obeyed in UTF mode, but
416        was being obeyed unconditionally. In 8-bit mode this could cause incorrect
417        processing when bytes with values greater than 127 were present. In 16-bit
418        mode the bug would be provoked by values in the range 0xfc00 to 0xdc00. In
419        both cases the values are those that cannot be the first data item in a UTF
420        character. The three items that might have provoked this were recursions,
421        possessively repeated groups, and atomic groups.
422    
423    40. Ensure that libpcre is explicitly listed in the link commands for pcretest
424        and pcregrep, because some OS require shared objects to be explicitly
425        passed to ld, causing the link step to fail if they are not.
426    
427    41. There were two incorrect #ifdefs in pcre_study.c, meaning that, in 16-bit
428        mode, patterns that started with \h* or \R* might be incorrectly matched.
429    
430    
431    Version 8.30 04-February-2012
432    -----------------------------
433    
434  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this  1.  Renamed "isnumber" as "is_a_number" because in some Mac environments this
435      name is defined in ctype.h.      name is defined in ctype.h.
436    
437  2.  Fixed a bug in the code for calculating the fixed length of lookbehind  2.  Fixed a bug in fixed-length calculation for lookbehinds that would show up
438        only in quite long subpatterns.
439    
440    3.  Removed the function pcre_info(), which has been obsolete and deprecated
441        since it was replaced by pcre_fullinfo() in February 2000.
442    
443    4.  For a non-anchored pattern, if (*SKIP) was given with a name that did not
444        match a (*MARK), and the match failed at the start of the subject, a
445        reference to memory before the start of the subject could occur. This bug
446        was introduced by fix 17 of release 8.21.
447    
448    5.  A reference to an unset group with zero minimum repetition was giving
449        totally wrong answers (in non-JavaScript-compatibility mode). For example,
450        /(another)?(\1?)test/ matched against "hello world test". This bug was
451        introduced in release 8.13.
452    
453    6.  Add support for 16-bit character strings (a large amount of work involving
454        many changes and refactorings).
455    
456    7.  RunGrepTest failed on msys because \r\n was replaced by whitespace when the
457        command "pattern=`printf 'xxx\r\njkl'`" was run. The pattern is now taken
458        from a file.
459    
460    8.  Ovector size of 2 is also supported by JIT based pcre_exec (the ovector size
461        rounding is not applied in this particular case).
462    
463    9.  The invalid Unicode surrogate codepoints U+D800 to U+DFFF are now rejected
464        if they appear, or are escaped, in patterns.
465    
466    10. Get rid of a number of -Wunused-but-set-variable warnings.
467    
468    11. The pattern /(?=(*:x))(q|)/ matches an empty string, and returns the mark
469        "x". The similar pattern /(?=(*:x))((*:y)q|)/ did not return a mark at all.
470        Oddly, Perl behaves the same way. PCRE has been fixed so that this pattern
471        also returns the mark "x". This bug applied to capturing parentheses,
472        non-capturing parentheses, and atomic parentheses. It also applied to some
473      assertions.      assertions.
474    
475    12. Stephen Kelly's patch to CMakeLists.txt allows it to parse the version
476        information out of configure.ac instead of relying on pcre.h.generic, which
477        is not stored in the repository.
478    
479    13. Applied Dmitry V. Levin's patch for a more portable method for linking with
480        -lreadline.
481    
482    14. ZH added PCRE_CONFIG_JITTARGET; added its output to pcretest -C.
483    
484    15. Applied Graycode's patch to put the top-level frame on the stack rather
485        than the heap when not using the stack for recursion. This gives a
486        performance improvement in many cases when recursion is not deep.
487    
488    16. Experimental code added to "pcretest -C" to output the stack frame size.
489    
490    
491  Version 8.21 12-Dec-2011  Version 8.21 12-Dec-2011
492  ------------------------  ------------------------

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