[IR] CommonBackendContext and Symbols refactoring

* add [suspend]functionN factory factions
 * add `getContinuation` property
 * add `internalPackageName` property
 * fix lowerings

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/BackendContext.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.backend.common.ir.Ir
 import org.jetbrains.kotlin.backend.common.ir.SharedVariablesManager
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
+import org.jetbrains.kotlin.name.FqName
 
 interface BackendContext {
     val ir: Ir<CommonBackendContext>
@@ -28,4 +29,5 @@ interface BackendContext {
     val irBuiltIns: IrBuiltIns
     val sharedVariablesManager: SharedVariablesManager
     val declarationFactory: DeclarationFactory
+    val internalPackageFqn: FqName
 }

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/Ir.kt

@@ -19,10 +19,7 @@ import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.ir.types.classOrNull
-import org.jetbrains.kotlin.ir.util.ReferenceSymbolTable
-import org.jetbrains.kotlin.ir.util.fqNameWhenAvailable
-import org.jetbrains.kotlin.ir.util.getPackageFragment
-import org.jetbrains.kotlin.ir.util.referenceFunction
+import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.calls.components.isVararg
@@ -153,6 +150,8 @@ abstract class Symbols<out T : CommonBackendContext>(val context: T, private val
 
     abstract val coroutineSuspendedGetter: IrSimpleFunctionSymbol
 
+    abstract val getContinuation: IrSimpleFunctionSymbol
+
     private val binaryOperatorCache = mutableMapOf<Triple<Name, KotlinType, KotlinType>, IrFunctionSymbol>()
 
     fun getBinaryOperator(name: Name, lhsType: KotlinType, rhsType: KotlinType): IrFunctionSymbol {
@@ -184,6 +183,9 @@ abstract class Symbols<out T : CommonBackendContext>(val context: T, private val
     val intAnd = getBinaryOperator(OperatorNameConventions.AND, builtIns.intType, builtIns.intType)
     val intPlusInt = getBinaryOperator(OperatorNameConventions.PLUS, builtIns.intType, builtIns.intType)
 
+    fun functionN(n: Int): IrClassSymbol = symbolTable.referenceClass(builtIns.getFunction(n))
+    fun suspendFunctionN(n: Int): IrClassSymbol = symbolTable.referenceClass(builtIns.getSuspendFunction(n))
+
     companion object {
         fun isLateinitIsInitializedPropertyGetter(symbol: IrFunctionSymbol): Boolean =
             symbol is IrSimpleFunctionSymbol && symbol.owner.let { function ->

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsIrBackendContext.kt

@@ -135,13 +135,10 @@ class JsIrBackendContext(
 
     val intrinsics = JsIntrinsics(irBuiltIns, this)
 
+    override val internalPackageFqn = JS_PACKAGE_FQNAME
+
     private val operatorMap = referenceOperators()
 
-    // TODO: get rid of this
-
-    fun functionN(n: Int) = symbolTable.lazyWrapper.referenceClass(builtIns.getFunction(n))
-    fun suspendFunctionN(n: Int) = symbolTable.lazyWrapper.referenceClass(builtIns.getSuspendFunction(n))
-
     private fun primitivesWithImplicitCompanionObject(): List<Name> {
         val numbers = PrimitiveType.NUMBER_TYPES
             .filter { it.name != "LONG" && it.name != "CHAR" } // skip due to they have own explicit companions
@@ -184,6 +181,8 @@ class JsIrBackendContext(
                         NoLookupLocation.FROM_BACKEND
                     ).filterNot { it.isExpect }.single().getter!!
                 )
+
+            override val getContinuation = symbolTable.referenceSimpleFunction(getJsInternalFunction("getContinuation"))
         }
 
         override fun shouldGenerateHandlerParameterForDefaultBodyFun() = true

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/CallableReferenceLowering.kt

@@ -210,7 +210,7 @@ class CallableReferenceLowering(val context: JsIrBackendContext) : FileLoweringP
         val additionalDeclarations = generateFactoryBodyWithGuard(factoryFunction) {
             val statements = mutableListOf<IrStatement>(getterFunction)
 
-            val getterFunctionTypeSymbol = context.functionN(getterFunction.valueParameters.size + 1)
+            val getterFunctionTypeSymbol = context.ir.symbols.functionN(getterFunction.valueParameters.size + 1)
 
             val getterFunctionIrType = IrSimpleTypeImpl(getterFunctionTypeSymbol, false, emptyList(), emptyList())
             val irGetReference = JsIrBuilder.buildFunctionReference(getterFunctionIrType, getterFunction.symbol)
@@ -226,7 +226,7 @@ class CallableReferenceLowering(val context: JsIrBackendContext) : FileLoweringP
 
             if (setterFunction != null) {
                 statements += setterFunction
-                val setterFunctionTypeSymbol = context.functionN(setterFunction.valueParameters.size + 1)
+                val setterFunctionTypeSymbol = context.ir.symbols.functionN(setterFunction.valueParameters.size + 1)
                 val setterFunctionIrType = IrSimpleTypeImpl(setterFunctionTypeSymbol, false, emptyList(), emptyList())
                 val irSetReference = JsIrBuilder.buildFunctionReference(setterFunctionIrType, setterFunction.symbol)
                 statements += JsIrBuilder.buildCall(context.intrinsics.jsSetJSField.symbol).apply {
@@ -280,7 +280,7 @@ class CallableReferenceLowering(val context: JsIrBackendContext) : FileLoweringP
         val additionalDeclarations = generateFactoryBodyWithGuard(factoryFunction) {
             val statements = mutableListOf<IrStatement>(closureFunction)
 
-            val getterFunctionTypeSymbol = context.functionN(closureFunction.valueParameters.size + 1)
+            val getterFunctionTypeSymbol = context.ir.symbols.functionN(closureFunction.valueParameters.size + 1)
             val getterFunctionIrType = IrSimpleTypeImpl(getterFunctionTypeSymbol, false, emptyList(), emptyList())
             val irGetReference = JsIrBuilder.buildFunctionReference(getterFunctionIrType, closureFunction.symbol)
             val irVar = JsIrBuilder.buildVar(getterFunctionIrType, factoryFunction, initializer = irGetReference)

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/JsDefaultArgumentStubGenerator.kt

@@ -50,8 +50,7 @@ class JsDefaultArgumentStubGenerator(override val context: JsIrBackendContext) :
 
     private fun resolveInvoke(paramCount: Int): IrSimpleFunction {
         assert(paramCount > 0)
-        val fqn = FqName.fromSegments(listOf("kotlin", "Function$paramCount"))
-        val functionKlass = context.functionN(paramCount).owner
+        val functionKlass = context.ir.symbols.functionN(paramCount).owner
         return functionKlass.declarations.filterIsInstance<IrSimpleFunction>().first { it.name == Name.identifier("invoke") }
     }
 }

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/TestGenerator.kt

@@ -61,7 +61,7 @@ class TestGenerator(val context: JsIrBackendContext) : FileLoweringPass {
             putValueArgument(0, JsIrBuilder.buildString(context.irBuiltIns.stringType, name))
             putValueArgument(1, JsIrBuilder.buildBoolean(context.irBuiltIns.booleanType, ignored))
 
-            val refType = IrSimpleTypeImpl(context.functionN(0), false, emptyList(), emptyList())
+            val refType = IrSimpleTypeImpl(context.ir.symbols.functionN(0), false, emptyList(), emptyList())
             putValueArgument(2, JsIrBuilder.buildFunctionReference(refType, function.symbol))
         }
 

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmBackendContext.kt

@@ -45,6 +45,8 @@ class JvmBackendContext(
 
     override val configuration get() = state.configuration
 
+    override val internalPackageFqn = FqName("kotlin.jvm")
+
     internal fun getTopLevelClass(fqName: FqName): IrClassSymbol {
         val descriptor = state.module.getPackage(fqName.parent()).memberScope.getContributedClassifier(
             fqName.shortName(), NoLookupLocation.FROM_BACKEND

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmSymbols.kt

@@ -90,6 +90,9 @@ class JvmSymbols(
     override val coroutineSuspendedGetter: IrSimpleFunctionSymbol
         get() = TODO("not implemented")
 
+    override val getContinuation: IrSimpleFunctionSymbol
+        get() = TODO("not implemented")
+
     val javaLangClass: IrClassSymbol =
         context.getTopLevelClass(FqName("java.lang.Class"))