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Split out immutable GadtConstraint #16602

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merged 2 commits into from
Jan 26, 2023
Merged

Split out immutable GadtConstraint #16602

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8d1e5df
Split out immutable GadtConstraint
dwijnand Dec 30, 2022
b1a035a
Rename GadtConstraintHandling to GadtState
dwijnand Jan 24, 2023
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3 changes: 3 additions & 0 deletions compiler/src/dotty/tools/dotc/core/Constraint.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,9 @@ abstract class Constraint extends Showable {
*/
def nonParamBounds(param: TypeParamRef)(using Context): TypeBounds

/** The current bounds of type parameter `param` */
def bounds(param: TypeParamRef)(using Context): TypeBounds

/** A new constraint which is derived from this constraint by adding
* entries for all type parameters of `poly`.
* @param tvars A list of type variables associated with the params,
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11 changes: 1 addition & 10 deletions compiler/src/dotty/tools/dotc/core/ConstraintHandling.scala
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Expand Up @@ -749,16 +749,7 @@ trait ConstraintHandling {
}

/** The current bounds of type parameter `param` */
def bounds(param: TypeParamRef)(using Context): TypeBounds = {
val e = constraint.entry(param)
if (e.exists) e.bounds
else {
// TODO: should we change the type of paramInfos to nullable?
val pinfos: List[param.binder.PInfo] | Null = param.binder.paramInfos
if (pinfos != null) pinfos(param.paramNum) // pinfos == null happens in pos/i536.scala
else TypeBounds.empty
}
}
def bounds(param: TypeParamRef)(using Context): TypeBounds = constraint.bounds(param)

/** Add type lambda `tl`, possibly with type variables `tvars`, to current constraint
* and propagate all bounds.
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21 changes: 11 additions & 10 deletions compiler/src/dotty/tools/dotc/core/Contexts.scala
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Expand Up @@ -141,7 +141,8 @@ object Contexts {
def tree: Tree[?]
def scope: Scope
def typerState: TyperState
def gadt: GadtConstraint
def gadt: GadtConstraint = gadtState.gadt
def gadtState: GadtState
def searchHistory: SearchHistory
def source: SourceFile

Expand Down Expand Up @@ -410,7 +411,7 @@ object Contexts {
val constrCtx = outersIterator.dropWhile(_.outer.owner == owner).next()
superOrThisCallContext(owner, constrCtx.scope)
.setTyperState(typerState)
.setGadt(gadt)
.setGadtState(gadtState)
.fresh
.setScope(this.scope)
}
Expand Down Expand Up @@ -541,8 +542,8 @@ object Contexts {
private var _typerState: TyperState = uninitialized
final def typerState: TyperState = _typerState

private var _gadt: GadtConstraint = uninitialized
final def gadt: GadtConstraint = _gadt
private var _gadtState: GadtState = uninitialized
final def gadtState: GadtState = _gadtState

private var _searchHistory: SearchHistory = uninitialized
final def searchHistory: SearchHistory = _searchHistory
Expand All @@ -567,7 +568,7 @@ object Contexts {
_owner = origin.owner
_tree = origin.tree
_scope = origin.scope
_gadt = origin.gadt
_gadtState = origin.gadtState
_searchHistory = origin.searchHistory
_source = origin.source
_moreProperties = origin.moreProperties
Expand Down Expand Up @@ -624,12 +625,12 @@ object Contexts {
this._scope = typer.scope
setTypeAssigner(typer)

def setGadt(gadt: GadtConstraint): this.type =
util.Stats.record("Context.setGadt")
this._gadt = gadt
def setGadtState(gadtState: GadtState): this.type =
util.Stats.record("Context.setGadtState")
this._gadtState = gadtState
this
def setFreshGADTBounds: this.type =
setGadt(gadt.fresh)
setGadtState(gadtState.fresh)

def setSearchHistory(searchHistory: SearchHistory): this.type =
util.Stats.record("Context.setSearchHistory")
Expand Down Expand Up @@ -721,7 +722,7 @@ object Contexts {
.updated(notNullInfosLoc, Nil)
.updated(compilationUnitLoc, NoCompilationUnit)
c._searchHistory = new SearchRoot
c._gadt = GadtConstraint.empty
c._gadtState = GadtState(GadtConstraint.empty)
c
end FreshContext

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