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This includes byte array, string, char, unicode, locale, collation and
regular expressions.
Change-Id: I8b125fa52c8c513eb57a0f1298b91910e5a0d786
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
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After the move to PCRE2, optimizing patterns has been a thorn in the
side due to the fact that PCRE2's JIT compiler modifies the pattern
object itself (instead of returning a new set of data, like PCRE1
did). To make this fit with the existing behavior, a read/write
lock was introduced, with the read part locking when matching and
the write when compiling (or JIT-compiling) the pattern.
This locking strategy however introduced a performance issue,
as we needed:
* to acquire a write lock to compile/optimize the pattern (incl. the
common case where the pattern was already compiled, so bailing out
immediately);
* to acquire a read lock during the actual match, to prevent
some other thread from optimizing the pattern under our nose.
This was due to the "lazy" optimization policy of QRegularExpression
-- optimize a pattern after a certain number of usages. The
excessive amount of locking effectively limited scalability.
Simplify the code, and drop that policy altogether: since JIT
compiling in PCRE2 is faster and pretty much "always recommended",
just always do it for any pattern (unless it gets disabled via
env variables) when compiling it.
This allows to go back to a plain QMutex, and now the actual
matching doesn't require acquiring any locks any longer. Of course,
there is still a mutex acquired just before matching for checking
whether the pattern needs recompiling in the first place; this can
probably be further optimized via double-checked locking (using
atomics), but not doing it right now.
This shift makes a couple of pattern options controlling
optimization useless, and allows to centralize the 3
QRegularExpression tests (which were actually the very same test,
just setting slightly different optimizations strategies).
While at it, install a stress-test for threading, with the idea
of running it under TSAN or helgrind to catch bugs in
QRegularExpression's locking.
[ChangeLog][Important Behavior Changes][QRegularExpression] Regular
expressions are now automatically optimized (including JIT
compiling) on their first usage. The pattern options
OptimizeOnFirstUsageOption and DontAutomaticallyOptimizeOption no
longer have any effect, and will get removed in a future version of
Qt. QRegularExpression::optimize() can be still used to compile and
optimize the regular expression in advance (before any match), if
needed.
Task-number: QTBUG-66781
Change-Id: Ia0e97208ae78255fe811b78029ed01c204e47bd2
Reviewed-by: David Faure <david.faure@kdab.com>
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Use the new qtConfig macro in all pro/pri files.
This required adding some feature entries, and adding
{private,public}Feature to every referenced already existing entry.
Change-Id: I164214dad1154df6ad84e86d99ed14994ef97cf4
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
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The fact that we kick in a pattern study and possibly a JIT compilation
after an undocumented number of usages is suboptimal, for a number
or reasons: users may want to JIT compile a pattern immediately,
and at the same time they may not want a random delay in the program
(due to the pattern getting optimized at a random usage).
So: add an optimize() call to force an immediate pattern optimization,
and a pattern option to force an optimization on the first usage.
Change-Id: I95efdecfd31f11ca7cceb9c05037df613601a11c
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Exporting the counter that controls the optimization of a compiled
pattern lets us to forcibly optimize all patterns. Therefore,
two tests are now run: one with default optimization values
and another one which always optimizes the pattern.
The counter itself was renamed with a qt_ prefix and put
inside the Qt compilation namespace
(thanks to rohanpm for pointing it out).
Change-Id: I56602433d37adc127772b2d0d2cdaf2e49d43c71
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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Added QRegularExpression, QRegularExpressionMatch and
QRegularExpressionMatchIterator as PCRE-enabled, regexp classes.
Documentation is included, as well as a first round of autotests.
Task-number: QTBUG-23489
Change-Id: Id47031b80602c913ccd2fd740070e3024ea06abc
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
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