[NI] Get rid of ResolvedAtom usage in ConstraintSystemCompletionContext

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/CreateFreshTypeVariableSubstitutorStage.kt

@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.fir.declarations.FirTypeParameterRef
 import org.jetbrains.kotlin.fir.declarations.FirTypeParameterRefsOwner
 import org.jetbrains.kotlin.fir.renderWithType
 import org.jetbrains.kotlin.fir.resolve.inference.TypeParameterBasedTypeVariable
+import org.jetbrains.kotlin.fir.resolve.inference.model.ConeDeclaredUpperBoundConstraintPosition
 import org.jetbrains.kotlin.fir.resolve.substitution.ConeSubstitutor
 import org.jetbrains.kotlin.fir.resolve.substitution.substitutorByMap
 import org.jetbrains.kotlin.fir.symbols.StandardClassIds
@@ -17,7 +18,6 @@ import org.jetbrains.kotlin.fir.symbols.impl.FirTypeParameterSymbol
 import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.fir.types.impl.FirTypePlaceholderProjection
 import org.jetbrains.kotlin.resolve.calls.inference.ConstraintSystemOperation
-import org.jetbrains.kotlin.fir.resolve.inference.model.FirDeclaredUpperBoundConstraintPosition
 import org.jetbrains.kotlin.resolve.calls.inference.model.SimpleConstraintSystemConstraintPosition
 
 internal object CreateFreshTypeVariableSubstitutorStage : ResolutionStage() {
@@ -137,7 +137,7 @@ private fun createToFreshVariableSubstitutorAndAddInitialConstraints(
         csBuilder.addSubtypeConstraint(
             defaultType,
             toFreshVariables.substituteOrSelf(upperBound),
-            FirDeclaredUpperBoundConstraintPosition()
+            ConeDeclaredUpperBoundConstraintPosition()
         )
     }
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/inference/ConstraintSystemCompleter.kt

@@ -9,11 +9,15 @@ import org.jetbrains.kotlin.fir.expressions.*
 import org.jetbrains.kotlin.fir.resolve.BodyResolveComponents
 import org.jetbrains.kotlin.fir.resolve.calls.Candidate
 import org.jetbrains.kotlin.fir.resolve.calls.FirNamedReferenceWithCandidate
+import org.jetbrains.kotlin.fir.resolve.inference.model.ConeFixVariableConstraintPosition
 import org.jetbrains.kotlin.fir.returnExpressions
 import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.fir.types.impl.ConeClassLikeTypeImpl
 import org.jetbrains.kotlin.resolve.calls.inference.ConstraintSystemBuilder
-import org.jetbrains.kotlin.resolve.calls.inference.components.*
+import org.jetbrains.kotlin.resolve.calls.inference.components.ConstraintSystemCompletionContext
+import org.jetbrains.kotlin.resolve.calls.inference.components.ConstraintSystemCompletionMode
+import org.jetbrains.kotlin.resolve.calls.inference.components.TypeVariableDirectionCalculator
+import org.jetbrains.kotlin.resolve.calls.inference.components.VariableFixationFinder
 import org.jetbrains.kotlin.resolve.calls.inference.model.NewConstraintSystemImpl
 import org.jetbrains.kotlin.resolve.calls.inference.model.SimpleConstraintSystemConstraintPosition
 import org.jetbrains.kotlin.resolve.calls.inference.model.VariableWithConstraints
@@ -203,7 +207,8 @@ class ConstraintSystemCompleter(private val components: BodyResolveComponents) {
     ) {
         val direction = TypeVariableDirectionCalculator(c, postponedResolveKtPrimitives, topLevelType).getDirection(variableWithConstraints)
         val resultType = components.inferenceComponents.resultTypeResolver.findResultType(c, variableWithConstraints, direction)
-        c.fixVariable(variableWithConstraints.typeVariable, resultType, atom = null) // TODO: obtain atom for diagnostics
+        val variable = variableWithConstraints.typeVariable
+        c.fixVariable(variable, resultType, ConeFixVariableConstraintPosition(variable)) // TODO: obtain atom for diagnostics
     }
 
     private fun analyzePostponeArgumentIfPossible(

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/inference/model/FirConstraintPositionAndErrors.kt

@@ -6,5 +6,9 @@
 package org.jetbrains.kotlin.fir.resolve.inference.model
 
 import org.jetbrains.kotlin.resolve.calls.inference.model.DeclaredUpperBoundConstraintPosition
+import org.jetbrains.kotlin.resolve.calls.inference.model.FixVariableConstraintPosition
+import org.jetbrains.kotlin.types.model.TypeVariableMarker
 
-class FirDeclaredUpperBoundConstraintPosition : DeclaredUpperBoundConstraintPosition<Nothing?>(null)
+class ConeDeclaredUpperBoundConstraintPosition : DeclaredUpperBoundConstraintPosition<Nothing?>(null)
+
+class ConeFixVariableConstraintPosition(variable: TypeVariableMarker) : FixVariableConstraintPosition<Nothing?>(variable, null)

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/ConstraintSystemCompletionContext.kt

@@ -7,8 +7,8 @@ package org.jetbrains.kotlin.resolve.calls.inference.components
 
 import org.jetbrains.kotlin.resolve.calls.inference.ConstraintSystemBuilder
 import org.jetbrains.kotlin.resolve.calls.inference.model.ConstraintSystemError
+import org.jetbrains.kotlin.resolve.calls.inference.model.FixVariableConstraintPosition
 import org.jetbrains.kotlin.resolve.calls.inference.model.VariableWithConstraints
-import org.jetbrains.kotlin.resolve.calls.model.ResolvedAtom
 import org.jetbrains.kotlin.types.model.KotlinTypeMarker
 import org.jetbrains.kotlin.types.model.TypeConstructorMarker
 import org.jetbrains.kotlin.types.model.TypeVariableMarker
@@ -28,7 +28,7 @@ interface ConstraintSystemCompletionContext : VariableFixationFinder.Context, Re
     // mutable operations
     fun addError(error: ConstraintSystemError)
 
-    fun fixVariable(variable: TypeVariableMarker, resultType: KotlinTypeMarker, atom: ResolvedAtom?)
+    fun fixVariable(variable: TypeVariableMarker, resultType: KotlinTypeMarker, position: FixVariableConstraintPosition<*>)
 
     fun asConstraintSystemCompletionContext(): ConstraintSystemCompletionContext
 }

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/KotlinConstraintSystemCompleter.kt

@@ -238,8 +238,9 @@ class KotlinConstraintSystemCompleter(
         topLevelAtoms: List<ResolvedAtom>
     ) {
         val resultType = resultTypeResolver.findResultType(c, variableWithConstraints, direction)
-        val resolvedAtom = findResolvedAtomBy(variableWithConstraints.typeVariable, topLevelAtoms) ?: topLevelAtoms.firstOrNull()
-        c.fixVariable(variableWithConstraints.typeVariable, resultType, resolvedAtom)
+        val variable = variableWithConstraints.typeVariable
+        val resolvedAtom = findResolvedAtomBy(variable, topLevelAtoms) ?: topLevelAtoms.firstOrNull()
+        c.fixVariable(variable, resultType, FixVariableConstraintPositionImpl(variable, resolvedAtom))
     }
 
     private fun ConstraintSystemCompletionContext.fixVariablesOrReportNotEnoughInformation(
@@ -300,7 +301,7 @@ class KotlinConstraintSystemCompleter(
             else -> ErrorUtils.createErrorType("Cannot infer type variable $typeVariable")
         }
 
-        c.fixVariable(typeVariable, resultErrorType, resolvedAtom)
+        c.fixVariable(typeVariable, resultErrorType, FixVariableConstraintPositionImpl(typeVariable, resolvedAtom))
     }
 
     private fun ConstraintSystemCompletionContext.getOrderedAllTypeVariables(

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/components/PostponedArgumentInputTypesResolver.kt

@@ -468,10 +468,11 @@ class PostponedArgumentInputTypesResolver(
         val variableWithConstraints = notFixedTypeVariables.getValue(variableForFixation.variable)
         val resultType =
             resultTypeResolver.findResultType(this, variableWithConstraints, TypeVariableDirectionCalculator.ResolveDirection.UNKNOWN)
-        val resolvedAtom = KotlinConstraintSystemCompleter.findResolvedAtomBy(variableWithConstraints.typeVariable, topLevelAtoms)
+        val variable = variableWithConstraints.typeVariable
+        val resolvedAtom = KotlinConstraintSystemCompleter.findResolvedAtomBy(variable, topLevelAtoms)
             ?: topLevelAtoms.firstOrNull()
 
-        fixVariable(variableWithConstraints.typeVariable, resultType, resolvedAtom)
+        fixVariable(variable, resultType, FixVariableConstraintPositionImpl(variable, resolvedAtom))
 
         return true
     }

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/inference/model/NewConstraintSystemImpl.kt

@@ -8,7 +8,6 @@ package org.jetbrains.kotlin.resolve.calls.inference.model
 import org.jetbrains.kotlin.resolve.calls.components.PostponedArgumentsAnalyzerContext
 import org.jetbrains.kotlin.resolve.calls.inference.*
 import org.jetbrains.kotlin.resolve.calls.inference.components.*
-import org.jetbrains.kotlin.resolve.calls.model.ResolvedAtom
 import org.jetbrains.kotlin.types.*
 import org.jetbrains.kotlin.types.checker.NewKotlinTypeChecker
 import org.jetbrains.kotlin.types.model.*
@@ -292,11 +291,11 @@ class NewConstraintSystemImpl(
 
     // KotlinConstraintSystemCompleter.Context
     // TODO: simplify this: do only substitution a fixing type variable rather than running of subtyping and full incorporation
-    override fun fixVariable(variable: TypeVariableMarker, resultType: KotlinTypeMarker, atom: ResolvedAtom?) {
+    override fun fixVariable(variable: TypeVariableMarker, resultType: KotlinTypeMarker, position: FixVariableConstraintPosition<*>) {
         checkState(State.BUILDING, State.COMPLETION)
 
         constraintInjector.addInitialEqualityConstraint(
-            this, variable.defaultType(), resultType, FixVariableConstraintPositionImpl(variable, atom)
+            this, variable.defaultType(), resultType, position
         )
 
         val freshTypeConstructor = variable.freshTypeConstructor()