[JS IR BE] Lazy initialize lowering properties

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LateinitLowering.kt

@@ -132,5 +132,5 @@ class LateinitLowering(val context: CommonBackendContext) : FileLoweringPass {
             )
         }
 
-    private val throwErrorFunction = context.ir.symbols.ThrowUninitializedPropertyAccessException.owner
+    private val throwErrorFunction by lazy { context.ir.symbols.ThrowUninitializedPropertyAccessException.owner }
 }

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

@@ -168,12 +168,14 @@ class JsIrBackendContext(
         return numbers + listOf(Name.identifier("String"))
     }
 
-    val primitiveCompanionObjects = primitivesWithImplicitCompanionObject()
-        .associate {
-            it to symbolTable.lazyWrapper.referenceClass(
-                getClass(JS_INTERNAL_PACKAGE_FQNAME.child(Name.identifier("${it.identifier}CompanionObject")))
-            )
-        }
+    val primitiveCompanionObjects by lazy {
+        primitivesWithImplicitCompanionObject()
+            .associate {
+                it to symbolTable.lazyWrapper.referenceClass(
+                    getClass(JS_INTERNAL_PACKAGE_FQNAME.child(Name.identifier("${it.identifier}CompanionObject")))
+                )
+            }
+    }
 
     val suspendFunctions = (0..22).map { symbolTable.referenceClass(builtIns.getSuspendFunction(it)) }
 
@@ -237,29 +239,35 @@ class JsIrBackendContext(
         override fun shouldGenerateHandlerParameterForDefaultBodyFun() = true
     }
 
-    val throwISEymbol = getFunctions(kotlinPackageFqn.child(Name.identifier("THROW_CCE"))).singleOrNull()?.let {
-        symbolTable.referenceSimpleFunction(it) } ?: irBuiltIns.throwIseSymbol
+    val throwISEymbol by lazy { getFunctions(kotlinPackageFqn.child(Name.identifier("THROW_CCE"))).singleOrNull()?.let {
+        symbolTable.referenceSimpleFunction(it) } ?: irBuiltIns.throwIseSymbol }
 
     val coroutineImplLabelProperty by lazy { ir.symbols.coroutineImpl.getPropertyDeclaration("state")!! }
     val coroutineImplResultSymbol by lazy { ir.symbols.coroutineImpl.getPropertyDeclaration("result")!! }
     val coroutineImplExceptionProperty by lazy { ir.symbols.coroutineImpl.getPropertyDeclaration("exception")!! }
     val coroutineImplExceptionStateProperty by lazy { ir.symbols.coroutineImpl.getPropertyDeclaration("exceptionState")!! }
 
-    val primitiveClassesObject = symbolTable.referenceClass(
-        getClass(FqName.fromSegments(listOf("kotlin", "reflect", "js", "internal", "PrimitiveClasses")))
-    ).owner
+    val primitiveClassesObject by lazy {
+        symbolTable.referenceClass(
+            getClass(FqName.fromSegments(listOf("kotlin", "reflect", "js", "internal", "PrimitiveClasses")))
+        ).owner
+    }
 
-    val primitiveClassProperties = primitiveClassesObject.declarations.filterIsInstance<IrProperty>()
-    val primitiveClassFunctionClass = primitiveClassesObject.declarations
-        .filterIsInstance<IrSimpleFunction>()
-        .find { it.name == Name.identifier("functionClass") }!!
+    val primitiveClassProperties by lazy { primitiveClassesObject.declarations.filterIsInstance<IrProperty>() }
+    val primitiveClassFunctionClass by lazy {
+        primitiveClassesObject.declarations
+            .filterIsInstance<IrSimpleFunction>()
+            .find { it.name == Name.identifier("functionClass") }!!
+    }
 
-    val throwableClass = symbolTable.referenceClass(
-        getClass(JsIrBackendContext.KOTLIN_PACKAGE_FQN.child(Name.identifier("Throwable")))
-    ).owner
-    val throwableConstructors = throwableClass.declarations.filterIsInstance<IrConstructor>()
+    val throwableClass by lazy {
+        symbolTable.referenceClass(
+            getClass(JsIrBackendContext.KOTLIN_PACKAGE_FQN.child(Name.identifier("Throwable")))
+        ).owner
+    }
+    val throwableConstructors by lazy { throwableClass.declarations.filterIsInstance<IrConstructor>() }
 
-    val defaultThrowableCtor = throwableConstructors.single { it.valueParameters.size == 0 }
+    val defaultThrowableCtor by lazy { throwableConstructors.single { it.valueParameters.size == 0 } }
 
     private fun referenceOperators() = OperatorNames.ALL.map { name ->
         // TODO to replace KotlinType with IrType we need right equals on IrType

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

@@ -23,44 +23,47 @@ import org.jetbrains.kotlin.ir.visitors.transformChildrenVoid
 import org.jetbrains.kotlin.name.Name
 
 class ClassReferenceLowering(val context: JsIrBackendContext) : FileLoweringPass {
-    private val intrinsics = context.intrinsics
+    private val intrinsics by lazy { context.intrinsics }
 
-    private val primitiveClassesObject = context.primitiveClassesObject
+    private val primitiveClassesObject by lazy { context.primitiveClassesObject }
 
-    private val primitiveClassProperties = context.primitiveClassProperties
+    private val primitiveClassProperties by lazy { context.primitiveClassProperties }
 
     private fun primitiveClassProperty(name: String) =
         primitiveClassProperties.single { it.name == Name.identifier(name) }
 
-
-    private val finalPrimitiveClasses = mapOf(
-        IrType::isBoolean to "booleanClass",
-        IrType::isByte to "byteClass",
-        IrType::isShort to "shortClass",
-        IrType::isInt to "intClass",
-        IrType::isFloat to "floatClass",
-        IrType::isDouble to "doubleClass",
-        IrType::isArray to "arrayClass",
-        IrType::isString to "stringClass",
-        IrType::isThrowable to "throwableClass",
-        IrType::isBooleanArray to "booleanArrayClass",
-        IrType::isCharArray to "charArrayClass",
-        IrType::isByteArray to "byteArrayClass",
-        IrType::isShortArray to "shortArrayClass",
-        IrType::isIntArray to "intArrayClass",
-        IrType::isLongArray to "longArrayClass",
-        IrType::isFloatArray to "floatArrayClass",
-        IrType::isDoubleArray to "doubleArrayClass"
-    ).mapValues {
-        primitiveClassProperty(it.value).getter!!
+    private val finalPrimitiveClasses by lazy {
+        mapOf(
+            IrType::isBoolean to "booleanClass",
+            IrType::isByte to "byteClass",
+            IrType::isShort to "shortClass",
+            IrType::isInt to "intClass",
+            IrType::isFloat to "floatClass",
+            IrType::isDouble to "doubleClass",
+            IrType::isArray to "arrayClass",
+            IrType::isString to "stringClass",
+            IrType::isThrowable to "throwableClass",
+            IrType::isBooleanArray to "booleanArrayClass",
+            IrType::isCharArray to "charArrayClass",
+            IrType::isByteArray to "byteArrayClass",
+            IrType::isShortArray to "shortArrayClass",
+            IrType::isIntArray to "intArrayClass",
+            IrType::isLongArray to "longArrayClass",
+            IrType::isFloatArray to "floatArrayClass",
+            IrType::isDoubleArray to "doubleArrayClass"
+        ).mapValues {
+            primitiveClassProperty(it.value).getter!!
+        }
     }
 
-    private val openPrimitiveClasses = mapOf(
-        IrType::isAny to "anyClass",
-        IrType::isNumber to "numberClass",
-        IrType::isNothing to "nothingClass"
-    ).mapValues {
-        primitiveClassProperty(it.value).getter!!
+    private val openPrimitiveClasses by lazy {
+        mapOf(
+            IrType::isAny to "anyClass",
+            IrType::isNumber to "numberClass",
+            IrType::isNothing to "nothingClass"
+        ).mapValues {
+            primitiveClassProperty(it.value).getter!!
+        }
     }
 
     private fun callGetKClassFromExpression(returnType: IrType, typeArgument: IrType, argument: IrExpression): IrExpression {