[FIR] Implement JvmTypeMapper based on cone types

compiler/fir/cones/src/org/jetbrains/kotlin/fir/symbols/StandardClassIds.kt

@@ -5,6 +5,7 @@
 
 package org.jetbrains.kotlin.fir.symbols
 
+import org.jetbrains.kotlin.builtins.StandardNames
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
@@ -74,6 +75,14 @@ object StandardClassIds {
     val unsignedTypes = listOf(UByte, UShort, UInt, ULong)
     val unsignedArrayTypeByElementType = unsignedTypes.associate { id -> id to id.shortClassName.primitiveArrayId() }
     val elementTypeByUnsignedArrayType = unsignedArrayTypeByElementType.inverseMap()
+
+    val Continuation =
+        ClassId(StandardNames.COROUTINES_PACKAGE_FQ_NAME_RELEASE, StandardNames.CONTINUATION_INTERFACE_FQ_NAME_RELEASE.shortName())
+
+    @Suppress("FunctionName")
+    fun FunctionN(n: Int): ClassId {
+        return "Function$n".baseId()
+    }
 }
 
 private fun <K, V> Map<K, V>.inverseMap() = entries.associate { (k, v) -> v to k }

compiler/fir/fir2ir/jvm-backend/build.gradle.kts

@@ -5,6 +5,7 @@ plugins {
 
 dependencies {
     compileOnly(project(":core:descriptors"))
+    compileOnly(project(":core:compiler.backend.common.jvm"))
     compileOnly(project(":compiler:fir:cones"))
     compileOnly(project(":compiler:fir:resolve"))
     compileOnly(project(":compiler:fir:jvm"))

compiler/fir/fir2ir/jvm-backend/src/org/jetbrains/kotlin/fir/backend/jvm/FirJvmTypeMapper.kt

@@ -0,0 +1,118 @@
+/*
+ * Copyright 2010-2020 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.backend.jvm
+
+import org.jetbrains.kotlin.descriptors.ClassKind
+import org.jetbrains.kotlin.fir.FirSession
+import org.jetbrains.kotlin.fir.FirSessionComponent
+import org.jetbrains.kotlin.fir.resolve.defaultType
+import org.jetbrains.kotlin.fir.resolve.firSymbolProvider
+import org.jetbrains.kotlin.fir.resolve.inference.isKClassType
+import org.jetbrains.kotlin.fir.resolve.inference.isSuspendFunctionType
+import org.jetbrains.kotlin.fir.symbols.ConeClassLikeLookupTag
+import org.jetbrains.kotlin.fir.symbols.ConeClassifierLookupTag
+import org.jetbrains.kotlin.fir.symbols.ConeTypeParameterLookupTag
+import org.jetbrains.kotlin.fir.symbols.StandardClassIds
+import org.jetbrains.kotlin.fir.symbols.impl.FirRegularClassSymbol
+import org.jetbrains.kotlin.fir.typeContext
+import org.jetbrains.kotlin.fir.types.*
+import org.jetbrains.kotlin.fir.types.impl.ConeTypeParameterTypeImpl
+import org.jetbrains.kotlin.load.kotlin.JvmDescriptorTypeWriter
+import org.jetbrains.kotlin.load.kotlin.TypeMappingMode
+import org.jetbrains.kotlin.types.AbstractTypeMapper
+import org.jetbrains.kotlin.types.TypeMappingContext
+import org.jetbrains.kotlin.types.TypeSystemCommonBackendContext
+import org.jetbrains.kotlin.types.TypeSystemCommonBackendContextForTypeMapping
+import org.jetbrains.kotlin.types.model.KotlinTypeMarker
+import org.jetbrains.kotlin.types.model.SimpleTypeMarker
+import org.jetbrains.kotlin.types.model.TypeConstructorMarker
+import org.jetbrains.kotlin.types.model.TypeParameterMarker
+import org.jetbrains.org.objectweb.asm.Type
+
+class FirJvmTypeMapper(val session: FirSession) : TypeMappingContext<JvmDescriptorTypeWriter<Type>>, FirSessionComponent {
+    override val typeContext = ConeTypeSystemCommonBackendContextForTypeMapping(session.typeContext)
+
+    fun mapType(type: ConeKotlinType, mode: TypeMappingMode = TypeMappingMode.DEFAULT): Type {
+        return AbstractTypeMapper.mapType(this, type, mode)
+    }
+
+    override fun getClassInternalName(typeConstructor: TypeConstructorMarker): String {
+        require(typeConstructor is ConeClassLikeLookupTag)
+        return typeConstructor.classId.asString().replace(".", "$").replace("/", ".")
+    }
+
+    override fun JvmDescriptorTypeWriter<Type>.writeGenericType(type: SimpleTypeMarker, asmType: Type, mode: TypeMappingMode) {
+        error("Should not be called")
+    }
+}
+
+val FirSession.jvmTypeMapper: FirJvmTypeMapper by FirSession.sessionComponentAccessor()
+
+class ConeTypeSystemCommonBackendContextForTypeMapping(
+    val context: ConeTypeContext
+) : TypeSystemCommonBackendContext by context, TypeSystemCommonBackendContextForTypeMapping {
+    private val symbolProvider = context.session.firSymbolProvider
+
+    override fun TypeConstructorMarker.isTypeParameter(): Boolean {
+        return this is ConeTypeParameterLookupTag
+    }
+
+    override fun TypeConstructorMarker.defaultType(): ConeSimpleKotlinType {
+        require(this is ConeClassifierLookupTag)
+        return when (this) {
+            is ConeTypeParameterLookupTag -> ConeTypeParameterTypeImpl(this, isNullable = false)
+            is ConeClassLikeLookupTag -> {
+                val symbol = symbolProvider.getClassLikeSymbolByFqName(classId) as? FirRegularClassSymbol
+                    ?: error("Class for $this not found")
+                symbol.fir.defaultType()
+            }
+            else -> error("Unsupported type constructor: $this")
+        }
+    }
+
+    override fun SimpleTypeMarker.isSuspendFunction(): Boolean {
+        require(this is ConeSimpleKotlinType)
+        return isSuspendFunctionType(context.session)
+    }
+
+    override fun SimpleTypeMarker.isKClass(): Boolean {
+        require(this is ConeSimpleKotlinType)
+        return isKClassType()
+    }
+
+    override fun KotlinTypeMarker.isRawType(): Boolean {
+        return this is ConeRawType
+    }
+
+    override fun TypeConstructorMarker.typeWithArguments(arguments: List<KotlinTypeMarker>): ConeSimpleKotlinType {
+        arguments.forEach {
+            require(it is ConeKotlinType)
+        }
+        @Suppress("UNCHECKED_CAST")
+        return defaultType().withArguments((arguments as List<ConeKotlinType>).toTypedArray())
+    }
+
+    override fun TypeParameterMarker.representativeUpperBound(): ConeKotlinType {
+        require(this is ConeTypeParameterLookupTag)
+        val bounds = this.typeParameterSymbol.fir.bounds.map { it.coneType }
+        return bounds.firstOrNull {
+            val classId = it.classId ?: return@firstOrNull false
+            val classSymbol = symbolProvider.getClassLikeSymbolByFqName(classId) as? FirRegularClassSymbol ?: return@firstOrNull false
+            val kind = classSymbol.fir.classKind
+            kind != ClassKind.INTERFACE && kind != ClassKind.ANNOTATION_CLASS
+        } ?: bounds.first()
+    }
+
+    override fun continuationTypeConstructor(): ConeClassLikeLookupTag {
+        return symbolProvider.getClassLikeSymbolByFqName(StandardClassIds.Continuation)?.toLookupTag()
+            ?: error("Continuation class not found")
+    }
+
+    override fun functionNTypeConstructor(n: Int): TypeConstructorMarker {
+        return symbolProvider.getClassLikeSymbolByFqName(StandardClassIds.FunctionN(n))?.toLookupTag()
+            ?: error("Function$n class not found")
+    }
+}

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

@@ -17,6 +17,8 @@ import org.jetbrains.kotlin.fir.scopes.unsubstitutedScope
 import org.jetbrains.kotlin.fir.symbols.impl.ConeClassLikeLookupTagImpl
 import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
 import org.jetbrains.kotlin.fir.typeContext
+import org.jetbrains.kotlin.fir.resolve.fullyExpandedType
+import org.jetbrains.kotlin.fir.symbols.StandardClassIds
 import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.fir.types.impl.ConeClassLikeTypeImpl
 import org.jetbrains.kotlin.name.ClassId
@@ -121,6 +123,10 @@ fun ConeKotlinType.findContributedInvokeSymbol(
     return if (overriddenInvoke != null) declaredInvoke else null
 }
 
+fun ConeKotlinType.isKClassType(): Boolean {
+    return classId == StandardClassIds.KClass
+}
+
 fun ConeKotlinType.receiverType(expectedTypeRef: FirTypeRef?, session: FirSession): ConeKotlinType? {
     if (isBuiltinFunctionalType(session) && isExtensionFunctionType(session)) {
         return (this.fullyExpandedType(session).typeArguments.first() as ConeKotlinTypeProjection).type