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revision 1022 by ph10, Tue Aug 28 12:28:15 2012 UTC revision 1342 by ph10, Mon Jul 1 12:28:12 2013 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.32  Version 8.34 xx-xxxx-201x
5  ------------  --------------------------
6    
7    1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
8        executable memory. Patch inspired by Carsten Klein.
9    
10    2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
11        this macro is never tested and has no effect, because the work to support
12        coverage involves only compiling and linking options and special targets in
13        the Makefile. The comment in config.h implied that defining the macro would
14        enable coverage support, which is totally false. There was also support for
15        setting this macro in the CMake files (my fault, I just copied it from
16        configure). SUPPORT_GCOV has now been removed.
17    
18    
19    Version 8.33 28-May-2013
20    --------------------------
21    
22    1.  Added 'U' to some constants that are compared to unsigned integers, to
23        avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
24        variables that are added to signed variables, to ensure the result is
25        signed and can be negated.
26    
27    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
28        CMake config files.
29    
30    3.  Revise the creation of config.h.generic so that all boolean macros are
31        #undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
32        overriding via -D on the command line possible.
33    
34    4.  Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
35        to unsigned int is reported to make a quite noticeable speed difference in
36        a specific Windows environment. Testing on Linux did also appear to show
37        some benefit (and it is clearly not harmful). Also fixed the definition of
38        Xop which should be unsigned.
39    
40    5.  Related to (4), changing the definition of the intermediate variable cc
41        in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
42        improvements.
43    
44    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
45        unnecessary spaces.
46    
47    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
48        and later.
49    
50    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
51    
52    9.  Optimizing fast_forward_start_bits in JIT.
53    
54    10. Adding support for callouts in JIT, and fixing some issues revealed
55        during this work. Namely:
56    
57        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
58    
59        (b) Minimum length was not checked before the matching is started.
60    
61    11. The value of capture_last that is passed to callouts was incorrect in some
62        cases when there was a capture on one path that was subsequently abandoned
63        after a backtrack. Also, the capture_last value is now reset after a
64        recursion, since all captures are also reset in this case.
65    
66    12. The interpreter no longer returns the "too many substrings" error in the
67        case when an overflowing capture is in a branch that is subsequently
68        abandoned after a backtrack.
69    
70    13. In the pathological case when an offset vector of size 2 is used, pcretest
71        now prints out the matched string after a yield of 0 or 1.
72    
73    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
74        Only supported by the JIT compiler at the moment.
75    
76    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
77    
78    16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
79        offset of the starting point of the matching process, provided the offsets
80        vector is large enough.
81    
82    17. The \A escape now records a lookbehind value of 1, though its execution
83        does not actually inspect the previous character. This is to ensure that,
84        in partial multi-segment matching, at least one character from the old
85        segment is retained when a new segment is processed. Otherwise, if there
86        are no lookbehinds in the pattern, \A might match incorrectly at the start
87        of a new segment.
88    
89    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
90    
91    19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
92        gives some modest performance improvement in 8-bit mode.
93    
94    20. Added the PCRE-specific property \p{Xuc} for matching characters that can
95        be expressed in certain programming languages using Universal Character
96        Names.
97    
98    21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
99        which points out that "non characters" are not "characters that may not
100        appear in Unicode strings" but rather "characters that are reserved for
101        internal use and have only local meaning".
102    
103    22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
104        there was a conditional group that depended on an assertion, if the
105        assertion was false, the callout that immediately followed the alternation
106        in the condition was skipped when pcre_exec() was used for matching.
107    
108    23. Allow an explicit callout to be inserted before an assertion that is the
109        condition for a conditional group, for compatibility with automatic
110        callouts, which always insert a callout at this point.
111    
112    24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
113        confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
114    
115    25. (*PRUNE) is now supported by the JIT compiler.
116    
117    26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
118    
119    27. Fix the case where there are two or more SKIPs with arguments that may be
120        ignored.
121    
122    28. (*SKIP) is now supported by the JIT compiler.
123    
124    29. (*THEN) is now supported by the JIT compiler.
125    
126    30. Update RunTest with additional test selector options.
127    
128    31. The way PCRE handles backtracking verbs has been changed in two ways.
129    
130        (1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
131        SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
132        backtracking. In some cases this makes it more Perl-compatible, but Perl's
133        rather obscure rules do not always do the same thing.
134    
135        (2) Previously, backtracking verbs were confined within assertions. This is
136        no longer the case for positive assertions, except for (*ACCEPT). Again,
137        this sometimes improves Perl compatibility, and sometimes does not.
138    
139    32. A number of tests that were in test 2 because Perl did things differently
140        have been moved to test 1, because either Perl or PCRE has changed, and
141        these tests are now compatible.
142    
143    32. Backtracking control verbs are now handled in the same way in JIT and
144        interpreter.
145    
146    33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
147        contained a forward subroutine reference caused a compile error.
148    
149    34. Auto-detect and optimize limited repetitions in JIT.
150    
151    35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
152        blocking (*UTF) etc.
153    
154    36. In the interpreter, maximizing pattern repetitions for characters and
155        character types now use tail recursion, which reduces stack usage.
156    
157    37. The value of the max lookbehind was not correctly preserved if a compiled
158        and saved regex was reloaded on a host of different endianness.
159    
160    38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
161        of the compiled pattern block, expand the flags field from 16 to 32 bits
162        because it was almost full.
163    
164    39. Try madvise first before posix_madvise.
165    
166    40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
167        with a pattern such as ^$. It has taken 4 years for anybody to notice! The
168        original change locked out all matches of empty strings. This has been
169        changed so that one match of an empty string per line is recognized.
170        Subsequent searches on the same line (for colouring or for --only-matching,
171        for example) do not recognize empty strings.
172    
173    41. Applied a user patch to fix a number of spelling mistakes in comments.
174    
175    42. Data lines longer than 65536 caused pcretest to crash.
176    
177    43. Clarified the data type for length and startoffset arguments for pcre_exec
178        and pcre_dfa_exec in the function-specific man pages, where they were
179        explicitly stated to be in bytes, never having been updated. I also added
180        some clarification to the pcreapi man page.
181    
182    44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
183        a segmentation fault.
184    
185    
186    Version 8.32 30-November-2012
187    -----------------------------
188    
189  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
190      character iterators.      character iterators.
# Line 16  Version 8.32 Line 198  Version 8.32
198    
199  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.  5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
200      Reported by Giuseppe D'Angelo.      Reported by Giuseppe D'Angelo.
201    
202  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
203      of a line, was being set incorrectly in cases where .* appeared inside      of a line, was being set incorrectly in cases where .* appeared inside
204      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
205      *PRUNE or *SKIP.      *PRUNE or *SKIP.
206    
207  7.  Improved instruction cache flush for POWER/PowerPC.  7.  Improved instruction cache flush for POWER/PowerPC.
208      Patch by Daniel Richard G.      Patch by Daniel Richard G.
209    
210  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
211      grep:      grep:
212    
213      (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.
214    
215      (b) An error is given if a pattern is too long.      (b) An error is given if a pattern is too long.
216    
217      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir      (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
218          are now supported.          are now supported.
219    
220      (d) --exclude-from and --include-from (multiple use) have been added.      (d) --exclude-from and --include-from (multiple use) have been added.
221    
222      (e) Exclusions and inclusions now apply to all files and directories, not      (e) Exclusions and inclusions now apply to all files and directories, not
223          just to those obtained from scanning a directory recursively.          just to those obtained from scanning a directory recursively.
224    
225      (f) Multiple uses of -f and --file-list are now supported.      (f) Multiple uses of -f and --file-list are now supported.
226    
227      (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
228          "read" (the GNU grep default) to "skip", because otherwise the presence          "read" (the GNU grep default) to "skip", because otherwise the presence
229          of a directory in the file list provokes an error.          of a directory in the file list provokes an error.
230    
231      (h) The documentation has been revised and clarified in places.      (h) The documentation has been revised and clarified in places.
232    
233  9.  Improve the matching speed of capturing brackets.  9.  Improve the matching speed of capturing brackets.
234    
235  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
236      grapheme cluster.      grapheme cluster.
237    
238  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
239      out POSIX threads when JIT support is configured.      out POSIX threads when JIT support is configured.
240    
241  12. Added support for PCRE_STUDY_EXTRA_NEEDED.  12. Added support for PCRE_STUDY_EXTRA_NEEDED.
242    
243    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
244        structure could go wrong in environments where size_t is not the same size
245        as int.
246    
247    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
248        set.
249    
250    15. The EBCDIC support had decayed; later updates to the code had included
251        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
252        general tidy up of EBCDIC-related issues, and the documentation was also
253        not quite right. There is now a test that can be run on ASCII systems to
254        check some of the EBCDIC-related things (but is it not a full test).
255    
256    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
257        in a small tidy to the code.
258    
259    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
260    
261    18. If the --only-matching (-o) option in pcregrep is specified multiple
262        times, each one causes appropriate output. For example, -o1 -o2 outputs the
263        substrings matched by the 1st and 2nd capturing parentheses. A separating
264        string can be specified by --om-separator (default empty).
265    
266    19. Improving the first n character searches.
267    
268    20. Turn case lists for horizontal and vertical white space into macros so that
269        they are defined only once.
270    
271    21. This set of changes together give more compatible Unicode case-folding
272        behaviour for characters that have more than one other case when UCP
273        support is available.
274    
275        (a) The Unicode property table now has offsets into a new table of sets of
276            three or more characters that are case-equivalent. The MultiStage2.py
277            script that generates these tables (the pcre_ucd.c file) now scans
278            CaseFolding.txt instead of UnicodeData.txt for character case
279            information.
280    
281        (b) The code for adding characters or ranges of characters to a character
282            class has been abstracted into a generalized function that also handles
283            case-independence. In UTF-mode with UCP support, this uses the new data
284            to handle characters with more than one other case.
285    
286        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
287            whose other case is greater than 256 are now correctly matched
288            caselessly. Previously, the high codepoint matched the low one, but not
289            vice versa.
290    
291        (d) The processing of \h, \H, \v, and \ in character classes now makes use
292            of the new class addition function, using character lists defined as
293            macros alongside the case definitions of 20 above.
294    
295        (e) Caseless back references now work with characters that have more than
296            one other case.
297    
298        (f) General caseless matching of characters with more than one other case
299            is supported.
300    
301    22. Unicode character properties were updated from Unicode 6.2.0
302    
303    23. Improved CMake support under Windows. Patch by Daniel Richard G.
304    
305    24. Add support for 32-bit character strings, and UTF-32
306    
307    25. Major JIT compiler update (code refactoring and bugfixing).
308        Experimental Sparc 32 support is added.
309    
310    26. Applied a modified version of Daniel Richard G's patch to create
311        pcre.h.generic and config.h.generic by "make" instead of in the
312        PrepareRelease script.
313    
314    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
315        pcre_compile.c when checking for a zero character.
316    
317    28. Introducing a native interface for JIT. Through this interface, the compiled
318        machine code can be directly executed. The purpose of this interface is to
319        provide fast pattern matching, so several sanity checks are not performed.
320        However, feature tests are still performed. The new interface provides
321        1.4x speedup compared to the old one.
322    
323    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
324        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
325        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
326    
327    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
328        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
329        the "old" RFC 2279). Instead, it ended up passing a negative length to
330        pcre_exec().
331    
332    31. Add support for GCC's visibility feature to hide internal functions.
333    
334    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
335        "unknown -C option" after outputting 0 or 1.
336    
337    33. There is now support for generating a code coverage report for the test
338        suite in environments where gcc is the compiler and lcov is installed. This
339        is mainly for the benefit of the developers.
340    
341    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
342        unaddressable using valgrind annotations, allowing valgrind to detect
343        invalid memory accesses. This is mainly for the benefit of the developers.
344    
345    25. (*UTF) can now be used to start a pattern in any of the three libraries.
346    
347    26. Give configure error if --enable-cpp but no C++ compiler found.
348    
349    
350  Version 8.31 06-July-2012  Version 8.31 06-July-2012
# Line 1403  Version 7.9 11-Apr-09 Line 1690  Version 7.9 11-Apr-09
1690  7.  A pattern that could match an empty string could cause pcregrep to loop; it  7.  A pattern that could match an empty string could cause pcregrep to loop; it
1691      doesn't make sense to accept an empty string match in pcregrep, so I have      doesn't make sense to accept an empty string match in pcregrep, so I have
1692      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this      locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
1693      seems to be how GNU grep behaves.      seems to be how GNU grep behaves. [But see later change 40 for release
1694        8.33.]
1695    
1696  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at  8.  The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
1697      start or after a newline", because the conditional assertion was not being      start or after a newline", because the conditional assertion was not being
# Line 1646  Version 7.7 07-May-08 Line 1934  Version 7.7 07-May-08
1934      containing () gave an internal compiling error instead of "reference to      containing () gave an internal compiling error instead of "reference to
1935      non-existent subpattern". Fortunately, when the pattern did exist, the      non-existent subpattern". Fortunately, when the pattern did exist, the
1936      compiled code was correct. (When scanning forwards to check for the      compiled code was correct. (When scanning forwards to check for the
1937      existencd of the subpattern, it was treating the data ']' as terminating      existence of the subpattern, it was treating the data ']' as terminating
1938      the class, so got the count wrong. When actually compiling, the reference      the class, so got the count wrong. When actually compiling, the reference
1939      was subsequently set up correctly.)      was subsequently set up correctly.)
1940    

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