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revision 1388 by ph10, Tue Nov 5 15:24:45 2013 UTC revision 1472 by ph10, Mon Apr 21 16:11:50 2014 UTC
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1  ChangeLog for PCRE  ChangeLog for PCRE
2  ------------------  ------------------
3    
4  Version 8.34 xx-xxxx-201x  Version 8.36 xx-xxx-2014
5    ------------------------
6    
7    1.  Got rid of some compiler warnings in the C++ modules that were shown up by
8        -Wmissing-field-initializers and -Wunused-parameter.
9    
10    2.  The tests for quantifiers being too big (greater than 65535) were being
11        applied after reading the number, and stupidly assuming that integer
12        overflow would give a negative number. The tests are now applied as the
13        numbers are read.
14    
15    
16    Version 8.35 04-April-2014
17  --------------------------  --------------------------
18    
19    1.  A new flag is set, when property checks are present in an XCLASS.
20        When this flag is not set, PCRE can perform certain optimizations
21        such as studying these XCLASS-es.
22    
23    2.  The auto-possessification of character sets were improved: a normal
24        and an extended character set can be compared now. Furthermore
25        the JIT compiler optimizes more character set checks.
26    
27    3.  Got rid of some compiler warnings for potentially uninitialized variables
28        that show up only when compiled with -O2.
29    
30    4.  A pattern such as (?=ab\K) that uses \K in an assertion can set the start
31        of a match later then the end of the match. The pcretest program was not
32        handling the case sensibly - it was outputting from the start to the next
33        binary zero. It now reports this situation in a message, and outputs the
34        text from the end to the start.
35    
36    5.  Fast forward search is improved in JIT. Instead of the first three
37        characters, any three characters with fixed position can be searched.
38        Search order: first, last, middle.
39    
40    6.  Improve character range checks in JIT. Characters are read by an inprecise
41        function now, which returns with an unknown value if the character code is
42        above a certain treshold (e.g: 256). The only limitation is that the value
43        must be bigger than the treshold as well. This function is useful, when
44        the characters above the treshold are handled in the same way.
45    
46    7.  The macros whose names start with RAWUCHAR are placeholders for a future
47        mode in which only the bottom 21 bits of 32-bit data items are used. To
48        make this more memorable for those maintaining the code, the names have
49        been changed to start with UCHAR21, and an extensive comment has been added
50        to their definition.
51    
52    8.  Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
53        to the export list in Makefile.am (they were accidentally omitted from the
54        8.34 tarball).
55    
56    9.  The informational output from pcretest used the phrase "starting byte set"
57        which is inappropriate for the 16-bit and 32-bit libraries. As the output
58        for "first char" and "need char" really means "non-UTF-char", I've changed
59        "byte" to "char", and slightly reworded the output. The documentation about
60        these values has also been (I hope) clarified.
61    
62    10. Another JIT related optimization: use table jumps for selecting the correct
63        backtracking path, when more than four alternatives are present inside a
64        bracket.
65    
66    11. Empty match is not possible, when the minimum length is greater than zero,
67        and there is no \K in the pattern. JIT should avoid empty match checks in
68        such cases.
69    
70    12. In a caseless character class with UCP support, when a character with more
71        than one alternative case was not the first character of a range, not all
72        the alternative cases were added to the class. For example, s and \x{17f}
73        are both alternative cases for S: the class [RST] was handled correctly,
74        but [R-T] was not.
75    
76    13. The configure.ac file always checked for pthread support when JIT was
77        enabled. This is not used in Windows, so I have put this test inside a
78        check for the presence of windows.h (which was already tested for).
79    
80    14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
81        The algorithm provides a way to skip certain starting offsets, and usually
82        faster than linear prefix searches.
83    
84    15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
85        as for 'fr_FR' and 'french'. For some reason, however, it then used the
86        Windows-specific input and output files, which have 'french' screwed in.
87        So this could never have worked. One of the problems with locales is that
88        they aren't always the same. I have now updated RunTest so that it checks
89        the output of the locale test (test 3) against three different output
90        files, and it allows the test to pass if any one of them matches. With luck
91        this should make the test pass on some versions of Solaris where it was
92        failing. Because of the uncertainty, the script did not used to stop if
93        test 3 failed; it now does. If further versions of a French locale ever
94        come to light, they can now easily be added.
95    
96    16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
97        there was a message during ./configure, but it did not stop. This now
98        provokes an error. The invalid example in README has been corrected.
99        If a value less than the minimum is given, the minimum value has always
100        been used, but now a warning is given.
101    
102    17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
103        was a bug in the test system, which is now fixed. Also, the list of various
104        configurations that are tested for each release did not have one with both
105        16/32 bits and --enable-bar-anycrlf. It now does.
106    
107    18. pcretest was missing "-C bsr" for displaying the \R default setting.
108    
109    19. Little endian PowerPC systems are supported now by the JIT compiler.
110    
111    20. The fast forward newline mechanism could enter to an infinite loop on
112        certain invalid UTF-8 input. Although we don't support these cases
113        this issue can be fixed by a performance optimization.
114    
115    21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
116        not take account if existing stack usage. There is now a new global
117        variable called pcre_stack_guard that can be set to point to an external
118        function to check stack availability. It is called at the start of
119        processing every parenthesized group.
120    
121    22. A typo in the code meant that in ungreedy mode the max/min qualifier
122        behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
123        not match "ab".
124    
125    23. When UTF was disabled, the JIT program reported some incorrect compile
126        errors. These messages are silenced now.
127    
128    24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
129        compiler.
130    
131    25. Change all the temporary files used in RunGrepTest to be different to those
132        used by RunTest so that the tests can be run simultaneously, for example by
133        "make -j check".
134    
135    
136    Version 8.34 15-December-2013
137    -----------------------------
138    
139  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT  1.  Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
140      executable memory. Patch inspired by Carsten Klein.      executable memory. Patch inspired by Carsten Klein.
141    
142  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although  2.  ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
143      this macro is never tested and has no effect, because the work to support      this macro is never tested and has no effect, because the work to support
144      coverage involves only compiling and linking options and special targets in      coverage involves only compiling and linking options and special targets in
145      the Makefile. The comment in config.h implied that defining the macro would      the Makefile. The comment in config.h implied that defining the macro would
146      enable coverage support, which is totally false. There was also support for      enable coverage support, which is totally false. There was also support for
147      setting this macro in the CMake files (my fault, I just copied it from      setting this macro in the CMake files (my fault, I just copied it from
148      configure). SUPPORT_GCOV has now been removed.      configure). SUPPORT_GCOV has now been removed.
149    
150  3.  Make a small performance improvement in strlen16() and strlen32() in  3.  Make a small performance improvement in strlen16() and strlen32() in
151      pcretest.      pcretest.
152    
153  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,  4.  Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
154      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose      detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
155      these cases). There was also one in pcretest.c.      these cases). There was also one in pcretest.c.
156    
157  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.  5.  Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
158    
159  6.  In UTF mode, the code for checking whether a group could match an empty  6.  In UTF mode, the code for checking whether a group could match an empty
160      string (which is used for indefinitely repeated groups to allow for      string (which is used for indefinitely repeated groups to allow for
# Line 31  Version 8.34 xx-xxxx-201x Line 163  Version 8.34 xx-xxxx-201x
163      data item and had a minimum repetition of zero (for example, [^\x{100}]* in      data item and had a minimum repetition of zero (for example, [^\x{100}]* in
164      UTF-8 mode). The effect was undefined: the group might or might not be      UTF-8 mode). The effect was undefined: the group might or might not be
165      deemed as matching an empty string, or the program might have crashed.      deemed as matching an empty string, or the program might have crashed.
166    
167  7.  The code for checking whether a group could match an empty string was not  7.  The code for checking whether a group could match an empty string was not
168      recognizing that \h, \H, \v, \V, and \R must match a character.      recognizing that \h, \H, \v, \V, and \R must match a character.
169    
170  8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match  8.  Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
171      an empty string. If it can, pcretest shows this in its information output.      an empty string. If it can, pcretest shows this in its information output.
172    
173  9.  Fixed two related bugs that applied to Unicode extended grapheme clusters  9.  Fixed two related bugs that applied to Unicode extended grapheme clusters
174      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when      that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
175      matched by pcre_exec() without using JIT:      matched by pcre_exec() without using JIT:
176    
177      (a) If the rest of the pattern did not match after a maximal run of      (a) If the rest of the pattern did not match after a maximal run of
178          grapheme clusters, the code for backing up to try with fewer of them          grapheme clusters, the code for backing up to try with fewer of them
179          did not always back up over a full grapheme when characters that do not          did not always back up over a full grapheme when characters that do not
180          have the modifier quality were involved, e.g. Hangul syllables.          have the modifier quality were involved, e.g. Hangul syllables.
181    
182      (b) If the match point in a subject started with modifier character, and      (b) If the match point in a subject started with modifier character, and
183          there was no match, the code could incorrectly back up beyond the match          there was no match, the code could incorrectly back up beyond the match
184          point, and potentially beyond the first character in the subject,          point, and potentially beyond the first character in the subject,
185          leading to a segfault or an incorrect match result.          leading to a segfault or an incorrect match result.
186    
187  10. A conditional group with an assertion condition could lead to PCRE  10. A conditional group with an assertion condition could lead to PCRE
188      recording an incorrect first data item for a match if no other first data      recording an incorrect first data item for a match if no other first data
189      item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a      item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
190      first data item, and therefore matched "ca" after "c" instead of at the      first data item, and therefore matched "ca" after "c" instead of at the
191      start.      start.
192    
193  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a  11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
194      bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.      bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
195    
196  12. The source of pcregrep now includes z/OS-specific code so that it can be  12. The source of pcregrep now includes z/OS-specific code so that it can be
197      compiled for z/OS as part of the special z/OS distribution.      compiled for z/OS as part of the special z/OS distribution.
198    
199  13. Added the -T and -TM options to pcretest.  13. Added the -T and -TM options to pcretest.
200    
201  14. The code in pcre_compile.c for creating the table of named capturing groups  14. The code in pcre_compile.c for creating the table of named capturing groups
202      has been refactored. Instead of creating the table dynamically during the      has been refactored. Instead of creating the table dynamically during the
203      actual compiling pass, the information is remembered during the pre-compile      actual compiling pass, the information is remembered during the pre-compile
204      pass (on the stack unless there are more than 20 named groups, in which      pass (on the stack unless there are more than 20 named groups, in which
205      case malloc() is used) and the whole table is created before the actual      case malloc() is used) and the whole table is created before the actual
206      compile happens. This has simplified the code (it is now nearly 150 lines      compile happens. This has simplified the code (it is now nearly 150 lines
207      shorter) and prepared the way for better handling of references to groups      shorter) and prepared the way for better handling of references to groups
208      with duplicate names.      with duplicate names.
209    
210  15. A back reference to a named subpattern when there is more than one of the  15. A back reference to a named subpattern when there is more than one of the
211      same name now checks them in the order in which they appear in the pattern.      same name now checks them in the order in which they appear in the pattern.
212      The first one that is set is used for the reference. Previously only the      The first one that is set is used for the reference. Previously only the
213      first one was inspected. This change makes PCRE more compatible with Perl.      first one was inspected. This change makes PCRE more compatible with Perl.
214    
215  16. Unicode character properties were updated from Unicode 6.3.0.  16. Unicode character properties were updated from Unicode 6.3.0.
216    
217  17. The compile-time code for auto-possessification has been refactored, based  17. The compile-time code for auto-possessification has been refactored, based
218      on a patch by Zoltan Herczeg. It now happens after instead of during      on a patch by Zoltan Herczeg. It now happens after instead of during
219      compilation. The code is cleaner, and more cases are handled. The option      compilation. The code is cleaner, and more cases are handled. The option
220      PCRE_NO_AUTO_POSSESSIFY is added for testing purposes, and the -O and /O      PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
221      options in pcretest are provided to set it.      options in pcretest are provided to set it. It can also be set by
222        (*NO_AUTO_POSSESS) at the start of a pattern.
223  18. The character VT has been added to the set of characters that match \s and  
224      are generally treated as white space, following this same change in Perl  18. The character VT has been added to the default ("C" locale) set of
225      5.18. There is now no difference between "Perl space" and "POSIX space".      characters that match \s and are generally treated as white space,
226        following this same change in Perl 5.18. There is now no difference between
227  19. The code for checking named groups as conditions, either for being set or      "Perl space" and "POSIX space". Whether VT is treated as white space in
228        other locales depends on the locale.
229    
230    19. The code for checking named groups as conditions, either for being set or
231      for being recursed, has been refactored (this is related to 14 and 15      for being recursed, has been refactored (this is related to 14 and 15
232      above). Processing unduplicated named groups should now be as fast at      above). Processing unduplicated named groups should now be as fast at
233      numerical groups, and processing duplicated groups should be faster than      numerical groups, and processing duplicated groups should be faster than
234      before.      before.
235    
236  20. Two patches to the CMake build system, by Alexander Barkov:  20. Two patches to the CMake build system, by Alexander Barkov:
237    
238        (1) Replace the "source" command by "." in CMakeLists.txt because        (1) Replace the "source" command by "." in CMakeLists.txt because
239            "source" is a bash-ism.            "source" is a bash-ism.
240    
241        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;        (2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
242            without these the CMake build does not work on Solaris.            without these the CMake build does not work on Solaris.
243    
244  21. Perl has changed its handling of \8 and \9. If there is no previously  21. Perl has changed its handling of \8 and \9. If there is no previously
245      encountered capturing group of those numbers, they are treated as the      encountered capturing group of those numbers, they are treated as the
246      literal characters 8 and 9 instead of a binary zero followed by the      literal characters 8 and 9 instead of a binary zero followed by the
247      literals. PCRE now does the same.      literals. PCRE now does the same.
248    
249  22. Following Perl, added \o{} to specify codepoints in octal, making it  22. Following Perl, added \o{} to specify codepoints in octal, making it
250      possible to specify values greater than 0777 and also making them      possible to specify values greater than 0777 and also making them
251      unambiguous.      unambiguous.
252    
253  23. Perl now gives an error for missing closing braces after \x{... instead of  23. Perl now gives an error for missing closing braces after \x{... instead of
254      treating the string as literal. PCRE now does the same.      treating the string as literal. PCRE now does the same.
255    
256  24. RunTest used to grumble if an inappropriate test was selected explicitly,  24. RunTest used to grumble if an inappropriate test was selected explicitly,
257      but just skip it when running all tests. This make it awkward to run ranges      but just skip it when running all tests. This make it awkward to run ranges
258      of tests when one of them was inappropriate. Now it just skips any      of tests when one of them was inappropriate. Now it just skips any
259      inappropriate tests, as it always did when running all tests.      inappropriate tests, as it always did when running all tests.
260    
261  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained  25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
262      character types such as \d or \w, too many callouts were inserted, and the      character types such as \d or \w, too many callouts were inserted, and the
263      data that they returned was rubbish.      data that they returned was rubbish.
264    
265  26. In UCP mode, \s was not matching two of the characters that Perl matches,  26. In UCP mode, \s was not matching two of the characters that Perl matches,
266      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they      namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
267      were matched by \h. The code has now been refactored so that the lists of      were matched by \h. The code has now been refactored so that the lists of
268      the horizontal and vertical whitespace characters used for \h and \v (which      the horizontal and vertical whitespace characters used for \h and \v (which
269      are defined only in one place) are now also used for \s.      are defined only in one place) are now also used for \s.
270    
271  27. Add JIT support for the 64 bit TileGX architecture.  27. Add JIT support for the 64 bit TileGX architecture.
272      Patch by Jiong Wang (Tilera Corporation).      Patch by Jiong Wang (Tilera Corporation).
273    
274  28. Possessive quantifiers for classes (both explicit and automatically  28. Possessive quantifiers for classes (both explicit and automatically
275      generated) now use special opcodes instead of wrapping in ONCE brackets.      generated) now use special opcodes instead of wrapping in ONCE brackets.
276    
277  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier  29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
278      (because it's meaningless), this was not happening when PCRE_CASELESS was      (because it's meaningless), this was not happening when PCRE_CASELESS was
279      set. Not wrong, but inefficient.      set. Not wrong, but inefficient.
280    
281  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode  30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
282      properties for \w, \d, etc) is present in a test regex. Otherwise if the      properties for \w, \d, etc) is present in a test regex. Otherwise if the
283      test contains no characters greater than 255, Perl doesn't realise it      test contains no characters greater than 255, Perl doesn't realise it
284      should be using Unicode semantics.      should be using Unicode semantics.
285    
286  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and  31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
287      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl      [:punct:] when PCRE_UCP is set so as to include the same characters as Perl
288      does in Unicode mode.      does in Unicode mode.
289    
290  32. Added the "forbid" facility to pcretest so that putting tests into the  32. Added the "forbid" facility to pcretest so that putting tests into the
291      wrong test files can sometimes be quickly detected.      wrong test files can sometimes be quickly detected.
292    
293    33. There is now a limit (default 250) on the depth of nesting of parentheses.
294        This limit is imposed to control the amount of system stack used at compile
295        time. It can be changed at build time by --with-parens-nest-limit=xxx or
296        the equivalent in CMake.
297    
298    34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
299        errors. Perl warns for these when in warning mode, but PCRE has no facility
300        for giving warnings.
301    
302    35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
303        However, this was not working for (?!) because it is optimized to (*FAIL),
304        for which PCRE does not allow quantifiers. The optimization is now disabled
305        when a quantifier follows (?!). I can't see any use for this, but it makes
306        things uniform.
307    
308    36. Perl no longer allows group names to start with digits, so I have made this
309        change also in PCRE. It simplifies the code a bit.
310    
311    37. In extended mode, Perl ignores spaces before a + that indicates a
312        possessive quantifier. PCRE allowed a space before the quantifier, but not
313        before the possessive +. It now does.
314    
315    38. The use of \K (reset reported match start) within a repeated possessive
316        group such as (a\Kb)*+ was not working.
317    
318    40. Document that the same character tables must be used at compile time and
319        run time, and that the facility to pass tables to pcre_exec() and
320        pcre_dfa_exec() is for use only with saved/restored patterns.
321    
322    41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
323        features for Builds with MSVC:
324    
325        1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
326           builds). The .rc files can be used to set FileDescription and many other
327           attributes.
328    
329        2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
330           This allows higher-level build scripts which want .pdb files to avoid
331           hard-coding the exact files needed."
332    
333    42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
334        mean "start of word" and "end of word", respectively, as a transition aid.
335    
336    43. A minimizing repeat of a class containing codepoints greater than 255 in
337        non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
338        compiled to use the heap for recursion.
339    
340    44. Got rid of some compiler warnings for unused variables when UTF but not UCP
341        is configured.
342    
343    
344  Version 8.33 28-May-2013  Version 8.33 28-May-2013
345  ------------------------  ------------------------

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