[IR] Add new API into IrBuiltIns to access functional interfaces

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

@@ -206,8 +206,8 @@ open class BuiltinSymbolsBase(protected val irBuiltIns: IrBuiltIns, private val
     val intAnd = getBinaryOperator(OperatorNameConventions.AND, builtIns.intType, builtIns.intType)
     val intPlusInt = getBinaryOperator(OperatorNameConventions.PLUS, builtIns.intType, builtIns.intType)
 
-    open fun functionN(n: Int): IrClassSymbol = symbolTable.lazyWrapper.referenceClass(builtIns.getFunction(n))
-    open fun suspendFunctionN(n: Int): IrClassSymbol = symbolTable.lazyWrapper.referenceClass(builtIns.getSuspendFunction(n))
+    open fun functionN(n: Int): IrClassSymbol = irBuiltIns.function(n)
+    open fun suspendFunctionN(n: Int): IrClassSymbol = irBuiltIns.suspendFunction(n)
 
     fun kproperty0(): IrClassSymbol = symbolTable.referenceClass(builtIns.kProperty0)
     fun kproperty1(): IrClassSymbol = symbolTable.referenceClass(builtIns.kProperty1)

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

@@ -38,6 +38,7 @@ object JvmBackendFacade {
         val psi2irContext = psi2ir.createGeneratorContext(state.module, state.bindingContext, JvmNameProvider, extensions = extensions)
         val pluginExtensions = IrGenerationExtension.getInstances(state.project)
         val functionFactory = IrFunctionFactory(psi2irContext.irBuiltIns, psi2irContext.symbolTable)
+        psi2irContext.irBuiltIns.functionFactory = functionFactory
 
         for (extension in pluginExtensions) {
             psi2ir.addPostprocessingStep { module ->

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

@@ -342,8 +342,7 @@ class JvmSymbols(
         }
     }
 
-    fun getFunction(parameterCount: Int): IrClassSymbol =
-        symbolTable.referenceClass(builtIns.getFunction(parameterCount))
+    fun getFunction(parameterCount: Int): IrClassSymbol = irBuiltIns.function(parameterCount)
 
     private val jvmFunctionClasses = storageManager.createMemoizedFunction { n: Int ->
         createFunctionClass(n, false)

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/descriptors/IrBuiltIns.kt

@@ -40,6 +40,8 @@ class IrBuiltIns(
 ) {
     val languageVersionSettings = typeTranslator.languageVersionSettings
 
+    lateinit var functionFactory: IrAbstractFunctionFactory
+
     private val builtInsModule = builtIns.builtInsModule
 
     private val packageFragmentDescriptor = IrBuiltinsPackageFragmentDescriptorImpl(builtInsModule, KOTLIN_INTERNAL_IR_FQN)
@@ -295,6 +297,12 @@ class IrBuiltIns(
     val dataClassArrayMemberToStringSymbol = defineOperator("dataClassArrayMemberToString", stringType, listOf(anyNType))
     val dataClassArrayMemberToString = dataClassArrayMemberToStringSymbol.descriptor
 
+    fun function(n: Int): IrClassSymbol = functionFactory.functionN(n).symbol
+    fun suspendFunction(n: Int): IrClassSymbol = functionFactory.suspendFunctionN(n).symbol
+
+    fun kFunction(n: Int): IrClassSymbol = functionFactory.kFunctionN(n).symbol
+    fun kSuspendFunction(n: Int): IrClassSymbol = functionFactory.kSuspendFunctionN(n).symbol
+
     companion object {
         val KOTLIN_INTERNAL_IR_FQN = FqName("kotlin.internal.ir")
         val BUILTIN_OPERATOR = object : IrDeclarationOriginImpl("OPERATOR") {}

compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt

@@ -138,6 +138,7 @@ fun generateKLib(
     val psi2IrContext = runAnalysisAndPreparePsi2Ir(depsDescriptors)
     val irBuiltIns = psi2IrContext.irBuiltIns
     val functionFactory = IrFunctionFactory(irBuiltIns, psi2IrContext.symbolTable)
+    irBuiltIns.functionFactory = functionFactory
 
     val expectDescriptorToSymbol = mutableMapOf<DeclarationDescriptor, IrSymbol>()
 
@@ -211,6 +212,7 @@ fun loadIr(
             val irBuiltIns = psi2IrContext.irBuiltIns
             val symbolTable = psi2IrContext.symbolTable
             val functionFactory = IrFunctionFactory(irBuiltIns, symbolTable)
+            irBuiltIns.functionFactory = functionFactory
 
             val irLinker = JsIrLinker(psi2IrContext.moduleDescriptor, emptyLoggingContext, irBuiltIns, symbolTable, functionFactory, null)
 
@@ -253,6 +255,7 @@ fun loadIr(
 
                 irLinker.deserializeIrModuleHeader(depsDescriptors.getModuleDescriptor(it), it, strategy)
             }
+            irBuiltIns.functionFactory = functionFactory
 
             val moduleFragment = deserializedModuleFragments.last()
 

plugins/scripting/scripting-compiler/src/org/jetbrains/kotlin/scripting/repl/js/JsScriptDependencyCompiler.kt

@@ -51,6 +51,7 @@ class JsScriptDependencyCompiler(
 
         val irBuiltIns = IrBuiltIns(builtIns, typeTranslator, symbolTable)
         val functionFactory = IrFunctionFactory(irBuiltIns, symbolTable)
+        irBuiltIns.functionFactory = functionFactory
         val jsLinker = JsIrLinker(null, emptyLoggingContext, irBuiltIns, symbolTable, functionFactory, null)
 
         val moduleFragment = IrModuleFragmentImpl(moduleDescriptor, irBuiltIns)