Result of calling `ExpressionCodegen.gen` was used only in two call
sites in the inliner. In all other call sites, we were doing unnecessary
work (and sometimes were even failing) by trying to construct a
KotlinType instance out from an IrType.
Note that even though the code from KT-50617 no longer fails to compile,
the underlying problem is still not solved, since the IrType for foo's
dispatch receiver is constructed incorrectly. The reason is that
SymbolTable links everything by IdSignature, which is identical for
classes with the same FQ name.
#KT-50617 Fixed
This big refactoring is needed to cleanup building of overrides
mappings and prevent creating redundant intersection overrides in
cases when there is no need in them:
```kotlin
interface A {
fun foo()
}
interface B {
fun foo()
}
interface C : A, B {
override fun foo()
}
```
Before this refactoring there was next override tree:
C.foo
intersection override (A.foo, B.foo)
A.foo
B.foo
Also this commit fixes special mapping of overrides in jvm scopes
for declarations which have kotlin builtins in supertypes with
special java mapping rules (collections, for example)
Otherwise the tests are flaky for some reason; stack overflow is thrown
from psi2ir sometimes. Probably it has something to do with the fact
that the JVM stack which is used by the compiler here is around the
default limit (which is 1M).
There are two possible scenarios, when fun interface method with inline
class parameter can be compiled.
First is when we compile fun interface itself before SAM adapter. In
that case, fun interface is lowered before we lower SAM adapter. Thus,
its method is mangled and mangling in the second time is an error.
Second is when we compile SAM adapter before the fun interface. In that
case, fun interface is not lowered, and we have to mangle the method.
The only way to distinguish there two cases I can think of is to check
whether the overridden method is already mangled, in other words, check,
whether the overridden method's suffix is doubled.
#KT-48499: Fixed
This is a partial revert of e857966edb.
Specifically, behavior is restored in the old backend, which will allow
to support language version 1.3, where this language feature was not
enabled yet. There are no changes in the JVM IR backend, because to
enable JVM IR with LV 1.3, you need to pass the compiler argument
`-Xuse-ir` which is not stable and we don't guarantee anything about it.
#KT-50251
Alexander Udalov