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revision 987 by zherczeg, Sat Jul 7 04:11:29 2012 UTC revision 1265 by ph10, Sun Mar 3 10:42:46 2013 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
4  Version 8.32  Version 8.33 xx-xxxx-201x
5  ------------  -------------------------
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.
12    2.  Applied patch by Daniel Richard G for quashing MSVC warnings to the
13        CMake config files.
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.
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.
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.
29    6.  Fix forward search in JIT when link size is 3 or greater. Also removed some
30        unnecessary spaces.
32    7.  Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
33        and later.
35    8.  Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
37    9.  Optimizing fast_forward_start_bits in JIT.
39    10. Adding experimental support for callouts in JIT, and fixing some
40        issues revealed during this work. Namely:
42        (a) Unoptimized capturing brackets incorrectly reset on backtrack.
44        (b) Minimum length was not checked before the matching is started.
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.
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.
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.
58    14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
59        Only supported by the JIT compiler at the moment.
61    15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
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.
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.
74    18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
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.
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.
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".
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.
94    Version 8.32 30-November-2012
95    -----------------------------
97  1.  Improved JIT compiler optimizations for first character search and single  1.  Improved JIT compiler optimizations for first character search and single
98      character iterators.      character iterators.
# Line 10  Version 8.32 Line 100  Version 8.32
100  2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.  2.  Supporting IBM XL C compilers for PPC architectures in the JIT compiler.
101      Patch by Daniel Richard G.      Patch by Daniel Richard G.
103    3.  Single character iterator optimizations in the JIT compiler.
105    4.  Improved JIT compiler optimizations for character ranges.
107    5.  Rename the "leave" variable names to "quit" to improve WinCE compatibility.
108        Reported by Giuseppe D'Angelo.
110    6.  The PCRE_STARTLINE bit, indicating that a match can occur only at the start
111        of a line, was being set incorrectly in cases where .* appeared inside
112        atomic brackets at the start of a pattern, or where there was a subsequent
113        *PRUNE or *SKIP.
115    7.  Improved instruction cache flush for POWER/PowerPC.
116        Patch by Daniel Richard G.
118    8.  Fixed a number of issues in pcregrep, making it more compatible with GNU
119        grep:
121        (a) There is now no limit to the number of patterns to be matched.
123        (b) An error is given if a pattern is too long.
125        (c) Multiple uses of --exclude, --exclude-dir, --include, and --include-dir
126            are now supported.
128        (d) --exclude-from and --include-from (multiple use) have been added.
130        (e) Exclusions and inclusions now apply to all files and directories, not
131            just to those obtained from scanning a directory recursively.
133        (f) Multiple uses of -f and --file-list are now supported.
135        (g) In a Windows environment, the default for -d has been changed from
136            "read" (the GNU grep default) to "skip", because otherwise the presence
137            of a directory in the file list provokes an error.
139        (h) The documentation has been revised and clarified in places.
141    9.  Improve the matching speed of capturing brackets.
143    10. Changed the meaning of \X so that it now matches a Unicode extended
144        grapheme cluster.
146    11. Patch by Daniel Richard G to the autoconf files to add a macro for sorting
147        out POSIX threads when JIT support is configured.
149    12. Added support for PCRE_STUDY_EXTRA_NEEDED.
151    13. In the POSIX wrapper regcomp() function, setting re_nsub field in the preg
152        structure could go wrong in environments where size_t is not the same size
153        as int.
155    14. Applied user-supplied patch to pcrecpp.cc to allow PCRE_NO_UTF8_CHECK to be
156        set.
158    15. The EBCDIC support had decayed; later updates to the code had included
159        explicit references to (e.g.) \x0a instead of CHAR_LF. There has been a
160        general tidy up of EBCDIC-related issues, and the documentation was also
161        not quite right. There is now a test that can be run on ASCII systems to
162        check some of the EBCDIC-related things (but is it not a full test).
164    16. The new PCRE_STUDY_EXTRA_NEEDED option is now used by pcregrep, resulting
165        in a small tidy to the code.
167    17. Fix JIT tests when UTF is disabled and both 8 and 16 bit mode are enabled.
169    18. If the --only-matching (-o) option in pcregrep is specified multiple
170        times, each one causes appropriate output. For example, -o1 -o2 outputs the
171        substrings matched by the 1st and 2nd capturing parentheses. A separating
172        string can be specified by --om-separator (default empty).
174    19. Improving the first n character searches.
176    20. Turn case lists for horizontal and vertical white space into macros so that
177        they are defined only once.
179    21. This set of changes together give more compatible Unicode case-folding
180        behaviour for characters that have more than one other case when UCP
181        support is available.
183        (a) The Unicode property table now has offsets into a new table of sets of
184            three or more characters that are case-equivalent. The MultiStage2.py
185            script that generates these tables (the pcre_ucd.c file) now scans
186            CaseFolding.txt instead of UnicodeData.txt for character case
187            information.
189        (b) The code for adding characters or ranges of characters to a character
190            class has been abstracted into a generalized function that also handles
191            case-independence. In UTF-mode with UCP support, this uses the new data
192            to handle characters with more than one other case.
194        (c) A bug that is fixed as a result of (b) is that codepoints less than 256
195            whose other case is greater than 256 are now correctly matched
196            caselessly. Previously, the high codepoint matched the low one, but not
197            vice versa.
199        (d) The processing of \h, \H, \v, and \ in character classes now makes use
200            of the new class addition function, using character lists defined as
201            macros alongside the case definitions of 20 above.
203        (e) Caseless back references now work with characters that have more than
204            one other case.
206        (f) General caseless matching of characters with more than one other case
207            is supported.
209    22. Unicode character properties were updated from Unicode 6.2.0
211    23. Improved CMake support under Windows. Patch by Daniel Richard G.
213    24. Add support for 32-bit character strings, and UTF-32
215    25. Major JIT compiler update (code refactoring and bugfixing).
216        Experimental Sparc 32 support is added.
218    26. Applied a modified version of Daniel Richard G's patch to create
219        pcre.h.generic and config.h.generic by "make" instead of in the
220        PrepareRelease script.
222    27. Added a definition for CHAR_NULL (helpful for the z/OS port), and use it in
223        pcre_compile.c when checking for a zero character.
225    28. Introducing a native interface for JIT. Through this interface, the compiled
226        machine code can be directly executed. The purpose of this interface is to
227        provide fast pattern matching, so several sanity checks are not performed.
228        However, feature tests are still performed. The new interface provides
229        1.4x speedup compared to the old one.
231    29. If pcre_exec() or pcre_dfa_exec() was called with a negative value for
232        the subject string length, the error given was PCRE_ERROR_BADOFFSET, which
233        was confusing. There is now a new error PCRE_ERROR_BADLENGTH for this case.
235    30. In 8-bit UTF-8 mode, pcretest failed to give an error for data codepoints
236        greater than 0x7fffffff (which cannot be represented in UTF-8, even under
237        the "old" RFC 2279). Instead, it ended up passing a negative length to
238        pcre_exec().
240    31. Add support for GCC's visibility feature to hide internal functions.
242    32. Running "pcretest -C pcre8" or "pcretest -C pcre16" gave a spurious error
243        "unknown -C option" after outputting 0 or 1.
245    33. There is now support for generating a code coverage report for the test
246        suite in environments where gcc is the compiler and lcov is installed. This
247        is mainly for the benefit of the developers.
249    34. If PCRE is built with --enable-valgrind, certain memory regions are marked
250        unaddressable using valgrind annotations, allowing valgrind to detect
251        invalid memory accesses. This is mainly for the benefit of the developers.
253    25. (*UTF) can now be used to start a pattern in any of the three libraries.
255    26. Give configure error if --enable-cpp but no C++ compiler found.
258  Version 8.31 06-July-2012  Version 8.31 06-July-2012
259  -------------------------  -------------------------

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