Motivation:
Users often expect simple patterns, like `[a]+` or `[^a]+`, to work fast
and without any problems, even with long strings.
Char class from the first pattern matches only 'a' and gets wrapped into
LeafQuantifierSet, and works fine with long strings indeed.
Char class from the second pattern, however, matches any character
except 'a', including supplementary code points. So, the number of chars
it consumes is not known beforehand. There is no optimization for such
char classes, and if they are matched multiple times, the stack memory
gets exhausted.
Modification:
Introduce FixedLengthQuantifierSet node.
The node represents quantifier over constructs that consume a fixed
amount of characters for a given string and index. Such constructs don't
need backtracking to find a different match. Thus, it is possible for
the node to avoid recursion when matching multiple times.
Result:
Fixes KT-46211, KT-35508 and probably KT-39789. Reproducer for the
latter issue is no longer available, but error stacktrace resembles
those of the other issues.
Motivation:
Calling AbstractCharClass.setNegative always leads to
mayContainSupplCodepoints being `true`, even when `alt` is already
equal to the argument. Given that CharClass always calls setNegative
with its constructor parameter - `negative`, mayContainSupplCodepoints
always gets set. i.e. `[a]` will have mayContainSupplCodepoints set.
mayContainSupplCodepoints affects what node (RangeSet or SupplementaryRangeSet)
wraps this char class. See Pattern.processRangeSet.
RangeSet is better optimized and avoids recursion when it is quantified.
Modification:
Set `mayContainSupplCodepoints` flag only when `alt` is updated.
When `alt` is updated, this char class gets inverted, hence now may
contain supplementary code points.
Otherwise, content of this char class does not change, i.e. no new
supplementary code points is added.
Result:
Fixes KT-46211.
Motivation:
The node was never used. Perhaps, it was copied from apache harmony
but ultimately, despite possible performance impact, SequenceSet was
used instead. See Pattern.processCharSet and AbstractSet.first.
The performance impact wouldn't be noticeable anyway.
Modification:
Keeping unused code in project is not a good practice, so get rid of it.
Result:
Less code to maintain.
- Introduce new intrinsics `wasm_ref_cast_null` & `wasm_ref_test_null`.
- Support getting type for immediate from generic argument.
- Remove redundant null check in `tryGetOrSetExternrefBox`.
Now target check intentionally runs always - even when Java sources are
empty. Java part configures publication 'org.gradle.jvm.version'
attribute which affect published artifact consumers and should be the
same as Kotlin jvmTarget value.
^KT-54993 Fixed
Ilya Gorbunov