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Regex: Update PCRE to v8.35.

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I was über lazy at first, so took libs from SM.
But actually it's quite easy to compile, so let's update to latest version \o/.
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Arkshine
2014-07-05 13:53:30 +02:00
parent d1153b8049
commit d4de0e6f1e
241 changed files with 51074 additions and 15011 deletions
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@@ -1,6 +1,501 @@
ChangeLog for PCRE
------------------
Version 8.35 04-April-2014
--------------------------
1. A new flag is set, when property checks are present in an XCLASS.
When this flag is not set, PCRE can perform certain optimizations
such as studying these XCLASS-es.
2. The auto-possessification of character sets were improved: a normal
and an extended character set can be compared now. Furthermore
the JIT compiler optimizes more character set checks.
3. Got rid of some compiler warnings for potentially uninitialized variables
that show up only when compiled with -O2.
4. A pattern such as (?=ab\K) that uses \K in an assertion can set the start
of a match later then the end of the match. The pcretest program was not
handling the case sensibly - it was outputting from the start to the next
binary zero. It now reports this situation in a message, and outputs the
text from the end to the start.
5. Fast forward search is improved in JIT. Instead of the first three
characters, any three characters with fixed position can be searched.
Search order: first, last, middle.
6. Improve character range checks in JIT. Characters are read by an inprecise
function now, which returns with an unknown value if the character code is
above a certain treshold (e.g: 256). The only limitation is that the value
must be bigger than the treshold as well. This function is useful, when
the characters above the treshold are handled in the same way.
7. The macros whose names start with RAWUCHAR are placeholders for a future
mode in which only the bottom 21 bits of 32-bit data items are used. To
make this more memorable for those maintaining the code, the names have
been changed to start with UCHAR21, and an extensive comment has been added
to their definition.
8. Add missing (new) files sljitNativeTILEGX.c and sljitNativeTILEGX-encoder.c
to the export list in Makefile.am (they were accidentally omitted from the
8.34 tarball).
9. The informational output from pcretest used the phrase "starting byte set"
which is inappropriate for the 16-bit and 32-bit libraries. As the output
for "first char" and "need char" really means "non-UTF-char", I've changed
"byte" to "char", and slightly reworded the output. The documentation about
these values has also been (I hope) clarified.
10. Another JIT related optimization: use table jumps for selecting the correct
backtracking path, when more than four alternatives are present inside a
bracket.
11. Empty match is not possible, when the minimum length is greater than zero,
and there is no \K in the pattern. JIT should avoid empty match checks in
such cases.
12. In a caseless character class with UCP support, when a character with more
than one alternative case was not the first character of a range, not all
the alternative cases were added to the class. For example, s and \x{17f}
are both alternative cases for S: the class [RST] was handled correctly,
but [R-T] was not.
13. The configure.ac file always checked for pthread support when JIT was
enabled. This is not used in Windows, so I have put this test inside a
check for the presence of windows.h (which was already tested for).
14. Improve pattern prefix search by a simplified Boyer-Moore algorithm in JIT.
The algorithm provides a way to skip certain starting offsets, and usually
faster than linear prefix searches.
15. Change 13 for 8.20 updated RunTest to check for the 'fr' locale as well
as for 'fr_FR' and 'french'. For some reason, however, it then used the
Windows-specific input and output files, which have 'french' screwed in.
So this could never have worked. One of the problems with locales is that
they aren't always the same. I have now updated RunTest so that it checks
the output of the locale test (test 3) against three different output
files, and it allows the test to pass if any one of them matches. With luck
this should make the test pass on some versions of Solaris where it was
failing. Because of the uncertainty, the script did not used to stop if
test 3 failed; it now does. If further versions of a French locale ever
come to light, they can now easily be added.
16. If --with-pcregrep-bufsize was given a non-integer value such as "50K",
there was a message during ./configure, but it did not stop. This now
provokes an error. The invalid example in README has been corrected.
If a value less than the minimum is given, the minimum value has always
been used, but now a warning is given.
17. If --enable-bsr-anycrlf was set, the special 16/32-bit test failed. This
was a bug in the test system, which is now fixed. Also, the list of various
configurations that are tested for each release did not have one with both
16/32 bits and --enable-bar-anycrlf. It now does.
18. pcretest was missing "-C bsr" for displaying the \R default setting.
19. Little endian PowerPC systems are supported now by the JIT compiler.
20. The fast forward newline mechanism could enter to an infinite loop on
certain invalid UTF-8 input. Although we don't support these cases
this issue can be fixed by a performance optimization.
21. Change 33 of 8.34 is not sufficient to ensure stack safety because it does
not take account if existing stack usage. There is now a new global
variable called pcre_stack_guard that can be set to point to an external
function to check stack availability. It is called at the start of
processing every parenthesized group.
22. A typo in the code meant that in ungreedy mode the max/min qualifier
behaved like a min-possessive qualifier, and, for example, /a{1,3}b/U did
not match "ab".
23. When UTF was disabled, the JIT program reported some incorrect compile
errors. These messages are silenced now.
24. Experimental support for ARM-64 and MIPS-64 has been added to the JIT
compiler.
25. Change all the temporary files used in RunGrepTest to be different to those
used by RunTest so that the tests can be run simultaneously, for example by
"make -j check".
Version 8.34 15-December-2013
-----------------------------
1. Add pcre[16|32]_jit_free_unused_memory to forcibly free unused JIT
executable memory. Patch inspired by Carsten Klein.
2. ./configure --enable-coverage defined SUPPORT_GCOV in config.h, although
this macro is never tested and has no effect, because the work to support
coverage involves only compiling and linking options and special targets in
the Makefile. The comment in config.h implied that defining the macro would
enable coverage support, which is totally false. There was also support for
setting this macro in the CMake files (my fault, I just copied it from
configure). SUPPORT_GCOV has now been removed.
3. Make a small performance improvement in strlen16() and strlen32() in
pcretest.
4. Change 36 for 8.33 left some unreachable statements in pcre_exec.c,
detected by the Solaris compiler (gcc doesn't seem to be able to diagnose
these cases). There was also one in pcretest.c.
5. Cleaned up a "may be uninitialized" compiler warning in pcre_exec.c.
6. In UTF mode, the code for checking whether a group could match an empty
string (which is used for indefinitely repeated groups to allow for
breaking an infinite loop) was broken when the group contained a repeated
negated single-character class with a character that occupied more than one
data item and had a minimum repetition of zero (for example, [^\x{100}]* in
UTF-8 mode). The effect was undefined: the group might or might not be
deemed as matching an empty string, or the program might have crashed.
7. The code for checking whether a group could match an empty string was not
recognizing that \h, \H, \v, \V, and \R must match a character.
8. Implemented PCRE_INFO_MATCH_EMPTY, which yields 1 if the pattern can match
an empty string. If it can, pcretest shows this in its information output.
9. Fixed two related bugs that applied to Unicode extended grapheme clusters
that were repeated with a maximizing qualifier (e.g. \X* or \X{2,5}) when
matched by pcre_exec() without using JIT:
(a) If the rest of the pattern did not match after a maximal run of
grapheme clusters, the code for backing up to try with fewer of them
did not always back up over a full grapheme when characters that do not
have the modifier quality were involved, e.g. Hangul syllables.
(b) If the match point in a subject started with modifier character, and
there was no match, the code could incorrectly back up beyond the match
point, and potentially beyond the first character in the subject,
leading to a segfault or an incorrect match result.
10. A conditional group with an assertion condition could lead to PCRE
recording an incorrect first data item for a match if no other first data
item was recorded. For example, the pattern (?(?=ab)ab) recorded "a" as a
first data item, and therefore matched "ca" after "c" instead of at the
start.
11. Change 40 for 8.33 (allowing pcregrep to find empty strings) showed up a
bug that caused the command "echo a | ./pcregrep -M '|a'" to loop.
12. The source of pcregrep now includes z/OS-specific code so that it can be
compiled for z/OS as part of the special z/OS distribution.
13. Added the -T and -TM options to pcretest.
14. The code in pcre_compile.c for creating the table of named capturing groups
has been refactored. Instead of creating the table dynamically during the
actual compiling pass, the information is remembered during the pre-compile
pass (on the stack unless there are more than 20 named groups, in which
case malloc() is used) and the whole table is created before the actual
compile happens. This has simplified the code (it is now nearly 150 lines
shorter) and prepared the way for better handling of references to groups
with duplicate names.
15. A back reference to a named subpattern when there is more than one of the
same name now checks them in the order in which they appear in the pattern.
The first one that is set is used for the reference. Previously only the
first one was inspected. This change makes PCRE more compatible with Perl.
16. Unicode character properties were updated from Unicode 6.3.0.
17. The compile-time code for auto-possessification has been refactored, based
on a patch by Zoltan Herczeg. It now happens after instead of during
compilation. The code is cleaner, and more cases are handled. The option
PCRE_NO_AUTO_POSSESS is added for testing purposes, and the -O and /O
options in pcretest are provided to set it. It can also be set by
(*NO_AUTO_POSSESS) at the start of a pattern.
18. The character VT has been added to the default ("C" locale) set of
characters that match \s and are generally treated as white space,
following this same change in Perl 5.18. There is now no difference between
"Perl space" and "POSIX space". Whether VT is treated as white space in
other locales depends on the locale.
19. The code for checking named groups as conditions, either for being set or
for being recursed, has been refactored (this is related to 14 and 15
above). Processing unduplicated named groups should now be as fast at
numerical groups, and processing duplicated groups should be faster than
before.
20. Two patches to the CMake build system, by Alexander Barkov:
(1) Replace the "source" command by "." in CMakeLists.txt because
"source" is a bash-ism.
(2) Add missing HAVE_STDINT_H and HAVE_INTTYPES_H to config-cmake.h.in;
without these the CMake build does not work on Solaris.
21. Perl has changed its handling of \8 and \9. If there is no previously
encountered capturing group of those numbers, they are treated as the
literal characters 8 and 9 instead of a binary zero followed by the
literals. PCRE now does the same.
22. Following Perl, added \o{} to specify codepoints in octal, making it
possible to specify values greater than 0777 and also making them
unambiguous.
23. Perl now gives an error for missing closing braces after \x{... instead of
treating the string as literal. PCRE now does the same.
24. RunTest used to grumble if an inappropriate test was selected explicitly,
but just skip it when running all tests. This make it awkward to run ranges
of tests when one of them was inappropriate. Now it just skips any
inappropriate tests, as it always did when running all tests.
25. If PCRE_AUTO_CALLOUT and PCRE_UCP were set for a pattern that contained
character types such as \d or \w, too many callouts were inserted, and the
data that they returned was rubbish.
26. In UCP mode, \s was not matching two of the characters that Perl matches,
namely NEL (U+0085) and MONGOLIAN VOWEL SEPARATOR (U+180E), though they
were matched by \h. The code has now been refactored so that the lists of
the horizontal and vertical whitespace characters used for \h and \v (which
are defined only in one place) are now also used for \s.
27. Add JIT support for the 64 bit TileGX architecture.
Patch by Jiong Wang (Tilera Corporation).
28. Possessive quantifiers for classes (both explicit and automatically
generated) now use special opcodes instead of wrapping in ONCE brackets.
29. Whereas an item such as A{4}+ ignored the possessivenes of the quantifier
(because it's meaningless), this was not happening when PCRE_CASELESS was
set. Not wrong, but inefficient.
30. Updated perltest.pl to add /u (force Unicode mode) when /W (use Unicode
properties for \w, \d, etc) is present in a test regex. Otherwise if the
test contains no characters greater than 255, Perl doesn't realise it
should be using Unicode semantics.
31. Upgraded the handling of the POSIX classes [:graph:], [:print:], and
[:punct:] when PCRE_UCP is set so as to include the same characters as Perl
does in Unicode mode.
32. Added the "forbid" facility to pcretest so that putting tests into the
wrong test files can sometimes be quickly detected.
33. There is now a limit (default 250) on the depth of nesting of parentheses.
This limit is imposed to control the amount of system stack used at compile
time. It can be changed at build time by --with-parens-nest-limit=xxx or
the equivalent in CMake.
34. Character classes such as [A-\d] or [a-[:digit:]] now cause compile-time
errors. Perl warns for these when in warning mode, but PCRE has no facility
for giving warnings.
35. Change 34 for 8.13 allowed quantifiers on assertions, because Perl does.
However, this was not working for (?!) because it is optimized to (*FAIL),
for which PCRE does not allow quantifiers. The optimization is now disabled
when a quantifier follows (?!). I can't see any use for this, but it makes
things uniform.
36. Perl no longer allows group names to start with digits, so I have made this
change also in PCRE. It simplifies the code a bit.
37. In extended mode, Perl ignores spaces before a + that indicates a
possessive quantifier. PCRE allowed a space before the quantifier, but not
before the possessive +. It now does.
38. The use of \K (reset reported match start) within a repeated possessive
group such as (a\Kb)*+ was not working.
40. Document that the same character tables must be used at compile time and
run time, and that the facility to pass tables to pcre_exec() and
pcre_dfa_exec() is for use only with saved/restored patterns.
41. Applied Jeff Trawick's patch CMakeLists.txt, which "provides two new
features for Builds with MSVC:
1. Support pcre.rc and/or pcreposix.rc (as is already done for MinGW
builds). The .rc files can be used to set FileDescription and many other
attributes.
2. Add an option (-DINSTALL_MSVC_PDB) to enable installation of .pdb files.
This allows higher-level build scripts which want .pdb files to avoid
hard-coding the exact files needed."
42. Added support for [[:<:]] and [[:>:]] as used in the BSD POSIX library to
mean "start of word" and "end of word", respectively, as a transition aid.
43. A minimizing repeat of a class containing codepoints greater than 255 in
non-UTF 16-bit or 32-bit modes caused an internal error when PCRE was
compiled to use the heap for recursion.
44. Got rid of some compiler warnings for unused variables when UTF but not UCP
is configured.
Version 8.33 28-May-2013
------------------------
1. Added 'U' to some constants that are compared to unsigned integers, to
avoid compiler signed/unsigned warnings. Added (int) casts to unsigned
variables that are added to signed variables, to ensure the result is
signed and can be negated.
2. Applied patch by Daniel Richard G for quashing MSVC warnings to the
CMake config files.
3. Revise the creation of config.h.generic so that all boolean macros are
#undefined, whereas non-boolean macros are #ifndef/#endif-ed. This makes
overriding via -D on the command line possible.
4. Changing the definition of the variable "op" in pcre_exec.c from pcre_uchar
to unsigned int is reported to make a quite noticeable speed difference in
a specific Windows environment. Testing on Linux did also appear to show
some benefit (and it is clearly not harmful). Also fixed the definition of
Xop which should be unsigned.
5. Related to (4), changing the definition of the intermediate variable cc
in repeated character loops from pcre_uchar to pcre_uint32 also gave speed
improvements.
6. Fix forward search in JIT when link size is 3 or greater. Also removed some
unnecessary spaces.
7. Adjust autogen.sh and configure.ac to lose warnings given by automake 1.12
and later.
8. Fix two buffer over read issues in 16 and 32 bit modes. Affects JIT only.
9. Optimizing fast_forward_start_bits in JIT.
10. Adding support for callouts in JIT, and fixing some issues revealed
during this work. Namely:
(a) Unoptimized capturing brackets incorrectly reset on backtrack.
(b) Minimum length was not checked before the matching is started.
11. The value of capture_last that is passed to callouts was incorrect in some
cases when there was a capture on one path that was subsequently abandoned
after a backtrack. Also, the capture_last value is now reset after a
recursion, since all captures are also reset in this case.
12. The interpreter no longer returns the "too many substrings" error in the
case when an overflowing capture is in a branch that is subsequently
abandoned after a backtrack.
13. In the pathological case when an offset vector of size 2 is used, pcretest
now prints out the matched string after a yield of 0 or 1.
14. Inlining subpatterns in recursions, when certain conditions are fulfilled.
Only supported by the JIT compiler at the moment.
15. JIT compiler now supports 32 bit Macs thanks to Lawrence Velazquez.
16. Partial matches now set offsets[2] to the "bumpalong" value, that is, the
offset of the starting point of the matching process, provided the offsets
vector is large enough.
17. The \A escape now records a lookbehind value of 1, though its execution
does not actually inspect the previous character. This is to ensure that,
in partial multi-segment matching, at least one character from the old
segment is retained when a new segment is processed. Otherwise, if there
are no lookbehinds in the pattern, \A might match incorrectly at the start
of a new segment.
18. Added some #ifdef __VMS code into pcretest.c to help VMS implementations.
19. Redefined some pcre_uchar variables in pcre_exec.c as pcre_uint32; this
gives some modest performance improvement in 8-bit mode.
20. Added the PCRE-specific property \p{Xuc} for matching characters that can
be expressed in certain programming languages using Universal Character
Names.
21. Unicode validation has been updated in the light of Unicode Corrigendum #9,
which points out that "non characters" are not "characters that may not
appear in Unicode strings" but rather "characters that are reserved for
internal use and have only local meaning".
22. When a pattern was compiled with automatic callouts (PCRE_AUTO_CALLOUT) and
there was a conditional group that depended on an assertion, if the
assertion was false, the callout that immediately followed the alternation
in the condition was skipped when pcre_exec() was used for matching.
23. Allow an explicit callout to be inserted before an assertion that is the
condition for a conditional group, for compatibility with automatic
callouts, which always insert a callout at this point.
24. In 8.31, (*COMMIT) was confined to within a recursive subpattern. Perl also
confines (*SKIP) and (*PRUNE) in the same way, and this has now been done.
25. (*PRUNE) is now supported by the JIT compiler.
26. Fix infinite loop when /(?<=(*SKIP)ac)a/ is matched against aa.
27. Fix the case where there are two or more SKIPs with arguments that may be
ignored.
28. (*SKIP) is now supported by the JIT compiler.
29. (*THEN) is now supported by the JIT compiler.
30. Update RunTest with additional test selector options.
31. The way PCRE handles backtracking verbs has been changed in two ways.
(1) Previously, in something like (*COMMIT)(*SKIP), COMMIT would override
SKIP. Now, PCRE acts on whichever backtracking verb is reached first by
backtracking. In some cases this makes it more Perl-compatible, but Perl's
rather obscure rules do not always do the same thing.
(2) Previously, backtracking verbs were confined within assertions. This is
no longer the case for positive assertions, except for (*ACCEPT). Again,
this sometimes improves Perl compatibility, and sometimes does not.
32. A number of tests that were in test 2 because Perl did things differently
have been moved to test 1, because either Perl or PCRE has changed, and
these tests are now compatible.
32. Backtracking control verbs are now handled in the same way in JIT and
interpreter.
33. An opening parenthesis in a MARK/PRUNE/SKIP/THEN name in a pattern that
contained a forward subroutine reference caused a compile error.
34. Auto-detect and optimize limited repetitions in JIT.
35. Implement PCRE_NEVER_UTF to lock out the use of UTF, in particular,
blocking (*UTF) etc.
36. In the interpreter, maximizing pattern repetitions for characters and
character types now use tail recursion, which reduces stack usage.
37. The value of the max lookbehind was not correctly preserved if a compiled
and saved regex was reloaded on a host of different endianness.
38. Implemented (*LIMIT_MATCH) and (*LIMIT_RECURSION). As part of the extension
of the compiled pattern block, expand the flags field from 16 to 32 bits
because it was almost full.
39. Try madvise first before posix_madvise.
40. Change 7 for PCRE 7.9 made it impossible for pcregrep to find empty lines
with a pattern such as ^$. It has taken 4 years for anybody to notice! The
original change locked out all matches of empty strings. This has been
changed so that one match of an empty string per line is recognized.
Subsequent searches on the same line (for colouring or for --only-matching,
for example) do not recognize empty strings.
41. Applied a user patch to fix a number of spelling mistakes in comments.
42. Data lines longer than 65536 caused pcretest to crash.
43. Clarified the data type for length and startoffset arguments for pcre_exec
and pcre_dfa_exec in the function-specific man pages, where they were
explicitly stated to be in bytes, never having been updated. I also added
some clarification to the pcreapi man page.
44. A call to pcre_dfa_exec() with an output vector size less than 2 caused
a segmentation fault.
Version 8.32 30-November-2012
-----------------------------
@@ -1508,7 +2003,8 @@ Version 7.9 11-Apr-09
7. A pattern that could match an empty string could cause pcregrep to loop; it
doesn't make sense to accept an empty string match in pcregrep, so I have
locked it out (using PCRE's PCRE_NOTEMPTY option). By experiment, this
seems to be how GNU grep behaves.
seems to be how GNU grep behaves. [But see later change 40 for release
8.33.]
8. The pattern (?(?=.*b)b|^) was incorrectly compiled as "match must be at
start or after a newline", because the conditional assertion was not being
@@ -1751,7 +2247,7 @@ Version 7.7 07-May-08
containing () gave an internal compiling error instead of "reference to
non-existent subpattern". Fortunately, when the pattern did exist, the
compiled code was correct. (When scanning forwards to check for the
existencd of the subpattern, it was treating the data ']' as terminating
existence of the subpattern, it was treating the data ']' as terminating
the class, so got the count wrong. When actually compiling, the reference
was subsequently set up correctly.)