WIP - Performance improvement to global initialization checker #21514
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See test tests/init-global/warn/return2.scala
Otherwise, the following program causes weird address not found error:
import scala.collection.immutable.HashSet
object A:
val a = HashSet(1, 2, 3)
The error looks like the following:
-- Warning: out/bootstrap/scala2-library-bootstrapped/scala-3.6.0-RC1-bin-SNAPSHOT-nonbootstrapped/src_managed/main/scala-library-src/scala/collection/immutable/ChampCommon.scala:155:24
155 | currentStackLevel = currentStackLevel - 1
| ^^^^^^^^^^^^^^^^^
|[Internal error] Address not found FieldAddr(List(),val currentStackLevel,module class A$). Trace:
|Calling trace:
|├── object A: [ HashSet.scala:3 ]
|│ ^
|├── val a = HashSet(1, 2, 3) [ HashSet.scala:4 ]
|│ ^^^^^^^^^^^^^^^^
|├── def apply[A](elems: A*): CC[A] = from(elems) [ Factory.scala:103 ]
|│ ^^^^^^^^^^^
|├── def from[A](source: collection.IterableOnce[A]): HashSet[A] = [ HashSet.scala:1939 ]
|│ ^
|├── case _ => (newBuilder[A] ++= source).result() [ HashSet.scala:1943 ]
|│ ^^^^^^^^^^^^^^^^^^^^^^^^
|├── @inline final def ++= (@deprecatedName("xs") elems: IterableOnce[A]): this.type = addAll(elems) [ Growable.scala:69 ]
|│ ^^^^^^^^^^^^^
|├── override def addAll(xs: IterableOnce[A]) = { [ HashSet.scala:2079 ]
|│ ^
|├── } [ HashSet.scala:2096 ]
|│ ^
|├── new ChampBaseIterator[A, SetNode[A]](hm.rootNode) { [ HashSet.scala:2083 ]
|│ ^
|├── while(hasNext) { [ HashSet.scala:2084 ]
|│ ^^^^^^^
|├── final def hasNext = (currentValueCursor < currentValueLength) || searchNextValueNode() [ ChampCommon.scala:185 ]
|│ ^^^^^^^^^^^^^^^^^^^^^
|├── private final def searchNextValueNode(): Boolean = { [ ChampCommon.scala:162 ]
|│ ^
|├── popNode() [ ChampCommon.scala:178 ]
|│ ^^^^^^^^^
|├── private final def popNode(): Unit = { [ ChampCommon.scala:154 ]
|│ ^
|└── currentStackLevel = currentStackLevel - 1 [ ChampCommon.scala:155 ]
| ^^^^^^^^^^^^^^^^^
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Otherwise, the test tests/init-global/pos/lazy-local-val2.scala would stackoverflow
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WIP - Performance improvement to global initialization checker