[FIR JS] Generate dynamic FIRs via DynamicScope

compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/session/ComponentsContainers.kt

@@ -38,6 +38,7 @@ import org.jetbrains.kotlin.fir.resolve.transformers.plugin.GeneratedClassIndex
 import org.jetbrains.kotlin.fir.scopes.FirOverrideService
 import org.jetbrains.kotlin.fir.scopes.FirPlatformClassMapper
 import org.jetbrains.kotlin.fir.scopes.impl.FirDeclaredMemberScopeProvider
+import org.jetbrains.kotlin.fir.scopes.impl.FirDynamicMembersStorage
 import org.jetbrains.kotlin.fir.scopes.impl.FirIntersectionOverrideStorage
 import org.jetbrains.kotlin.fir.scopes.impl.FirSubstitutionOverrideStorage
 import org.jetbrains.kotlin.fir.symbols.FirPhaseManager
@@ -66,6 +67,7 @@ fun FirSession.registerCommonComponents(languageVersionSettings: LanguageVersion
     register(FirIntersectionOverrideStorage::class, FirIntersectionOverrideStorage(this))
     register(FirSamConstructorStorage::class, FirSamConstructorStorage(this))
     register(FirOverrideService::class, FirOverrideService(this))
+    register(FirDynamicMembersStorage::class, FirDynamicMembersStorage(this))
 }
 
 @OptIn(SessionConfiguration::class)

compiler/fir/providers/src/org/jetbrains/kotlin/fir/resolve/ScopeUtils.kt

@@ -14,10 +14,7 @@ import org.jetbrains.kotlin.fir.resolve.substitution.substitutorByMap
 import org.jetbrains.kotlin.fir.scopes.FakeOverrideTypeCalculator
 import org.jetbrains.kotlin.fir.scopes.FirTypeScope
 import org.jetbrains.kotlin.fir.scopes.FirUnstableSmartcastTypeScope
-import org.jetbrains.kotlin.fir.scopes.impl.FirScopeWithFakeOverrideTypeCalculator
+import org.jetbrains.kotlin.fir.scopes.impl.*
-import org.jetbrains.kotlin.fir.scopes.impl.FirStandardOverrideChecker
-import org.jetbrains.kotlin.fir.scopes.impl.FirTypeIntersectionScope
-import org.jetbrains.kotlin.fir.scopes.impl.getOrBuildScopeForIntegerConstantOperatorType
 import org.jetbrains.kotlin.fir.scopes.scopeForClass
 import org.jetbrains.kotlin.fir.symbols.ensureResolved
 import org.jetbrains.kotlin.fir.symbols.impl.ConeClassLikeLookupTagImpl
@@ -81,6 +78,7 @@ private fun ConeKotlinType.scope(useSiteSession: FirSession, scopeSession: Scope
             }
         }
         is ConeRawType -> lowerBound.scope(useSiteSession, scopeSession, requiredPhase)
+        is ConeDynamicType -> useSiteSession.dynamicMembersStorage.getDynamicScopeFor(scopeSession)
         is ConeFlexibleType -> lowerBound.scope(useSiteSession, scopeSession, requiredPhase)
         is ConeIntersectionType -> FirTypeIntersectionScope.prepareIntersectionScope(
             useSiteSession,

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirDynamicScope.kt

@@ -0,0 +1,189 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.scopes.impl
+
+import org.jetbrains.kotlin.builtins.StandardNames.DYNAMIC_FQ_NAME
+import org.jetbrains.kotlin.descriptors.EffectiveVisibility
+import org.jetbrains.kotlin.descriptors.Modality
+import org.jetbrains.kotlin.descriptors.Visibilities
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.FirSessionComponent
+import org.jetbrains.kotlin.fir.caches.FirCache
+import org.jetbrains.kotlin.fir.caches.createCache
+import org.jetbrains.kotlin.fir.caches.firCachesFactory
+import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
+import org.jetbrains.kotlin.fir.declarations.FirProperty
+import org.jetbrains.kotlin.fir.declarations.FirResolvePhase
+import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
+import org.jetbrains.kotlin.fir.declarations.builder.*
+import org.jetbrains.kotlin.fir.declarations.impl.FirResolvedDeclarationStatusImpl
+import org.jetbrains.kotlin.fir.expressions.FirOperationNameConventions
+import org.jetbrains.kotlin.fir.moduleData
+import org.jetbrains.kotlin.fir.resolve.ScopeSession
+import org.jetbrains.kotlin.fir.resolve.scope
+import org.jetbrains.kotlin.fir.scopes.FakeOverrideTypeCalculator
+import org.jetbrains.kotlin.fir.scopes.FirTypeScope
+import org.jetbrains.kotlin.fir.scopes.ProcessorAction
+import org.jetbrains.kotlin.fir.symbols.impl.*
+import org.jetbrains.kotlin.fir.types.ConeDynamicType
+import org.jetbrains.kotlin.fir.types.builder.buildResolvedTypeRef
+import org.jetbrains.kotlin.fir.types.coneType
+import org.jetbrains.kotlin.fir.types.create
+import org.jetbrains.kotlin.fir.types.impl.ConeClassLikeTypeImpl
+import org.jetbrains.kotlin.name.CallableId
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.name.StandardClassIds
+
+@RequiresOptIn(message = "Please, don't create FirDynamicScope-s manually")
+annotation class FirDynamicScopeConstructor
+
+class FirDynamicScope @FirDynamicScopeConstructor constructor(
+    private val session: FirSession,
+    private val scopeSession: ScopeSession,
+) : FirTypeScope() {
+    override fun processDirectOverriddenFunctionsWithBaseScope(
+        functionSymbol: FirNamedFunctionSymbol,
+        processor: (FirNamedFunctionSymbol, FirTypeScope) -> ProcessorAction
+    ): ProcessorAction = ProcessorAction.NEXT
+
+    override fun processDirectOverriddenPropertiesWithBaseScope(
+        propertySymbol: FirPropertySymbol,
+        processor: (FirPropertySymbol, FirTypeScope) -> ProcessorAction
+    ): ProcessorAction = ProcessorAction.NEXT
+
+    override fun getCallableNames(): Set<Name> = emptySet()
+
+    override fun getClassifierNames(): Set<Name> = emptySet()
+
+    private val anyTypeScope by lazy {
+        session.builtinTypes.anyType.type.scope(session, scopeSession, FakeOverrideTypeCalculator.DoNothing)
+    }
+
+    override fun processFunctionsByName(
+        name: Name,
+        processor: (FirNamedFunctionSymbol) -> Unit
+    ) {
+        var foundMemberInAny = false
+
+        anyTypeScope?.processFunctionsByName(name) {
+            foundMemberInAny = true
+            processor(it)
+        }
+
+        if (foundMemberInAny) {
+            return
+        }
+
+        session.dynamicMembersStorage.functionsCacheByName.getValue(name, null).also {
+            processor(it.symbol)
+        }
+    }
+
+    override fun processPropertiesByName(
+        name: Name,
+        processor: (FirVariableSymbol<*>) -> Unit
+    ) {
+        var foundMemberInAny = false
+
+        anyTypeScope?.processPropertiesByName(name) {
+            foundMemberInAny = true
+            processor(it)
+        }
+
+        if (foundMemberInAny) {
+            return
+        }
+
+        session.dynamicMembersStorage.propertiesCacheByName.getValue(name, null).also {
+            processor(it.symbol)
+        }
+    }
+}
+
+class FirDynamicMembersStorage(val session: FirSession) : FirSessionComponent {
+    private val cachesFactory = session.firCachesFactory
+
+    @OptIn(FirDynamicScopeConstructor::class)
+    private val dynamicScopeCacheByScope: FirCache<ScopeSession, FirDynamicScope, Nothing?> =
+        cachesFactory.createCache { it -> FirDynamicScope(session, it) }
+
+    fun getDynamicScopeFor(scopeSession: ScopeSession) = dynamicScopeCacheByScope.getValue(scopeSession, null)
+
+    val functionsCacheByName: FirCache<Name, FirSimpleFunction, Nothing?> =
+        cachesFactory.createCache { name -> buildPseudoFunctionByName(name) }
+
+    val propertiesCacheByName: FirCache<Name, FirProperty, Nothing?> =
+        cachesFactory.createCache { name -> buildPseudoPropertyByName(name) }
+
+    private val dynamicTypeRef = buildResolvedTypeRef {
+        type = ConeDynamicType.create(session)
+    }
+
+    private val anyArrayTypeRef = buildResolvedTypeRef {
+        type = ConeClassLikeTypeImpl(
+            ConeClassLikeLookupTagImpl(StandardClassIds.Array),
+            arrayOf(session.builtinTypes.nullableAnyType.coneType),
+            isNullable = false
+        )
+    }
+
+    private fun buildPseudoFunctionByName(name: Name) = buildSimpleFunction {
+        status = FirResolvedDeclarationStatusImpl(
+            Visibilities.Public,
+            Modality.FINAL,
+            EffectiveVisibility.Public,
+        ).apply {
+            isInfix = true
+            isOperator = true
+        }
+
+        this.name = name
+        this.symbol = FirNamedFunctionSymbol(CallableId(DYNAMIC_FQ_NAME, this.name))
+
+        moduleData = session.moduleData
+        origin = FirDeclarationOrigin.DynamicScope
+        resolvePhase = FirResolvePhase.BODY_RESOLVE
+
+        returnTypeRef = if (name in FirOperationNameConventions.ASSIGNMENT_NAMES) {
+            session.builtinTypes.unitType
+        } else {
+            dynamicTypeRef
+        }
+
+        val parameter = buildValueParameter {
+            moduleData = session.moduleData
+            origin = FirDeclarationOrigin.DynamicScope
+            returnTypeRef = anyArrayTypeRef
+            this.name = Name.identifier("args")
+            this.symbol = FirValueParameterSymbol(this.name)
+            isCrossinline = false
+            isNoinline = false
+            isVararg = true
+        }
+
+        valueParameters.add(parameter)
+    }
+
+    private fun buildPseudoPropertyByName(name: Name) = buildProperty {
+        this.name = name
+        this.symbol = FirPropertySymbol(CallableId(DYNAMIC_FQ_NAME, this.name))
+
+        status = FirResolvedDeclarationStatusImpl(
+            Visibilities.Public,
+            Modality.FINAL,
+            EffectiveVisibility.Public,
+        )
+
+        moduleData = session.moduleData
+        origin = FirDeclarationOrigin.DynamicScope
+        resolvePhase = FirResolvePhase.BODY_RESOLVE
+        returnTypeRef = dynamicTypeRef
+        isVar = true
+        isLocal = false
+    }
+}
+
+val FirSession.dynamicMembersStorage: FirDynamicMembersStorage by FirSession.sessionComponentAccessor()

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/ResolveUtils.kt

@@ -522,6 +522,7 @@ fun FirFunction.getAsForbiddenNamedArgumentsTarget(session: FirSession): Forbidd
             }
         }
         FirDeclarationOrigin.Synthetic -> null
+        FirDeclarationOrigin.DynamicScope -> null
         FirDeclarationOrigin.RenamedForOverride -> null
         FirDeclarationOrigin.WrappedIntegerOperator -> null
         is FirDeclarationOrigin.Plugin -> null // TODO: figure out what to do with plugin generated functions

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

@@ -20,6 +20,7 @@ sealed class CallKind(vararg resolutionSequence: ResolutionStage) {
         CheckDslScopeViolation,
         CheckLowPriorityInOverloadResolution,
         PostponedVariablesInitializerResolutionStage,
+        LowerPriorityIfDynamic,
         ConstraintSystemForks,
         CheckIncompatibleTypeVariableUpperBounds,
     )
@@ -53,6 +54,7 @@ sealed class CallKind(vararg resolutionSequence: ResolutionStage) {
         EagerResolveOfCallableReferences,
         CheckLowPriorityInOverloadResolution,
         PostponedVariablesInitializerResolutionStage,
+        LowerPriorityIfDynamic,
         ConstraintSystemForks,
         CheckIncompatibleTypeVariableUpperBounds,
     )

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

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.resolve.calls
 
 import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.declarations.FirFunction
 import org.jetbrains.kotlin.fir.declarations.FirSimpleFunction
 import org.jetbrains.kotlin.fir.declarations.FirValueParameter
@@ -79,7 +80,11 @@ fun BodyResolveComponents.mapArguments(
 
     // If this is an indexed access set operator, it could have default values or a vararg parameter in the middle.
     // For proper argument mapping, wrap the last one, which is supposed to be the updated value, as a named argument.
-    val isIndexedSetOperator = function is FirSimpleFunction && function.isOperator && function.name == OperatorNameConventions.SET
+    val isIndexedSetOperator = function is FirSimpleFunction
+            && function.isOperator
+            && function.name == OperatorNameConventions.SET
+            && function.origin !is FirDeclarationOrigin.DynamicScope
+
     if (isIndexedSetOperator &&
         function.valueParameters.any { it.defaultValue != null || it.isVararg }
     ) {

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

@@ -644,6 +644,14 @@ internal object CheckDeprecatedSinceKotlin : ResolutionStage() {
     }
 }
 
+internal object LowerPriorityIfDynamic : ResolutionStage() {
+    override suspend fun check(candidate: Candidate, callInfo: CallInfo, sink: CheckerSink, context: ResolutionContext) {
+        if (candidate.symbol.origin is FirDeclarationOrigin.DynamicScope) {
+            candidate.addDiagnostic(LowerPriorityForDynamic)
+        }
+    }
+}
+
 internal object ConstraintSystemForks : ResolutionStage() {
     override suspend fun check(candidate: Candidate, callInfo: CallInfo, sink: CheckerSink, context: ResolutionContext) {
         if (candidate.system.hasContradiction) return

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

@@ -5,6 +5,8 @@
 
 package org.jetbrains.kotlin.fir.resolve.calls
 
+import org.jetbrains.kotlin.fir.declarations.FirDeclaration
+import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
 import org.jetbrains.kotlin.fir.declarations.FirTypeParameterRefsOwner
 import org.jetbrains.kotlin.fir.types.FirTypeProjection
 import org.jetbrains.kotlin.fir.types.builder.buildPlaceholderProjection
@@ -33,7 +35,11 @@ internal object MapTypeArguments : ResolutionStage() {
 
         val owner = candidate.symbol.fir as FirTypeParameterRefsOwner
 
-        if (typeArguments.size == owner.typeParameters.size || callInfo.callKind == CallKind.DelegatingConstructorCall) {
+        if (
+            typeArguments.size == owner.typeParameters.size ||
+            callInfo.callKind == CallKind.DelegatingConstructorCall ||
+            (owner as? FirDeclaration)?.origin is FirDeclarationOrigin.DynamicScope
+        ) {
             candidate.typeArgumentMapping = TypeArgumentMapping.Mapped(typeArguments)
         } else {
             candidate.typeArgumentMapping = TypeArgumentMapping.Mapped(emptyList())

compiler/fir/semantics/src/org/jetbrains/kotlin/fir/resolve/calls/ResolutionDiagnostic.kt

@@ -89,6 +89,8 @@ class UnsafeCall(val actualType: ConeKotlinType) : ResolutionDiagnostic(UNSAFE_C
 
 object LowerPriorityToPreserveCompatibilityDiagnostic : ResolutionDiagnostic(RESOLVED_NEED_PRESERVE_COMPATIBILITY)
 
+object LowerPriorityForDynamic : ResolutionDiagnostic(RESOLVED_LOW_PRIORITY)
+
 object CandidateChosenUsingOverloadResolutionByLambdaAnnotation : ResolutionDiagnostic(RESOLVED)
 
 class UnstableSmartCast(val argument: FirExpressionWithSmartcast, val targetType: ConeKotlinType, val isCastToNotNull: Boolean) :

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirDeclarationOrigin.kt

@@ -12,6 +12,7 @@ sealed class FirDeclarationOrigin(private val displayName: String? = null, val f
     object BuiltIns : FirDeclarationOrigin()
     object Java : FirDeclarationOrigin()
     object Synthetic : FirDeclarationOrigin()
+    object DynamicScope : FirDeclarationOrigin()
     object SamConstructor : FirDeclarationOrigin()
     object Enhancement : FirDeclarationOrigin()
     object ImportedFromObject : FirDeclarationOrigin()

core/compiler.common/src/org/jetbrains/kotlin/builtins/StandardNames.kt

@@ -32,6 +32,8 @@ object StandardNames {
 
     @JvmField val CONTEXT_FUNCTION_TYPE_PARAMETER_COUNT_NAME = Name.identifier("count")
 
+    @JvmField val DYNAMIC_FQ_NAME = FqName("<dynamic>")
+
     @JvmField val COROUTINES_PACKAGE_FQ_NAME = FqName("kotlin.coroutines")
 
     @JvmField val COROUTINES_JVM_INTERNAL_PACKAGE_FQ_NAME = FqName("kotlin.coroutines.jvm.internal")