[JS IR] Add compiler argument about lazy initialisation

^KT-43222 fixed

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -125,6 +125,9 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xir-dce-print-reachability-info", description = "Print declarations' reachability info to stdout during performing DCE")
     var irDcePrintReachabilityInfo: Boolean by FreezableVar(false)
 
+    @Argument(value = "-Xir-property-lazy-initialisation", description = "Perform lazy initialisation for properties")
+    var irPropertyLazyInitialisation: Boolean by FreezableVar(false)
+
     @Argument(value = "-Xir-only", description = "Disables pre-IR backend")
     var irOnly: Boolean by FreezableVar(false)
 

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -27,7 +27,10 @@ import org.jetbrains.kotlin.cli.common.messages.MessageUtil
 import org.jetbrains.kotlin.cli.jvm.compiler.EnvironmentConfigFiles
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.cli.jvm.plugins.PluginCliParser
-import org.jetbrains.kotlin.config.*
+import org.jetbrains.kotlin.config.CommonConfigurationKeys
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.config.IncrementalCompilation
+import org.jetbrains.kotlin.config.Services
 import org.jetbrains.kotlin.incremental.components.ExpectActualTracker
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.incremental.js.IncrementalDataProvider
@@ -156,6 +159,11 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
             arguments.irModuleName ?: FileUtil.getNameWithoutExtension(outputFile)
         )
 
+        configurationJs.put(
+            JSConfigurationKeys.PROPERTY_LAZY_INITIALISATION,
+            arguments.irPropertyLazyInitialisation
+        )
+
         // TODO: in this method at least 3 different compiler configurations are used (original, env.configuration, jsConfig.configuration)
         // Such situation seems a bit buggy...
         val config = JsConfig(projectJs, configurationJs)

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

@@ -378,7 +378,7 @@ private val propertyLazyInitLoweringPhase = makeBodyLoweringPhase(
 private val removeInitializersForLazyProperties = makeDeclarationTransformerPhase(
     ::RemoveInitializersForLazyProperties,
     name = "RemoveInitializersForLazyProperties",
-    description = "Make property init as lazy"
+    description = "Remove property initializers if they was initialised lazily"
 )
 
 private val propertyAccessorInlinerLoweringPhase = makeBodyLoweringPhase(

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

@@ -20,6 +20,7 @@ import org.jetbrains.kotlin.ir.builders.declarations.buildField
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.declarations.persistent.PersistentIrElementBase
 import org.jetbrains.kotlin.ir.expressions.*
+import org.jetbrains.kotlin.js.config.JSConfigurationKeys.PROPERTY_LAZY_INITIALISATION
 import org.jetbrains.kotlin.name.Name
 import kotlin.collections.component1
 import kotlin.collections.component2
@@ -43,6 +44,10 @@ class PropertyLazyInitLowering(
         get() = context.fileToPurenessInitializers
 
     override fun lower(irBody: IrBody, container: IrDeclaration) {
+        if (context.configuration[PROPERTY_LAZY_INITIALISATION] != true) {
+            return
+        }
+
         if (container !is IrSimpleFunction && container !is IrField && container !is IrProperty)
             return
 
@@ -216,6 +221,10 @@ class RemoveInitializersForLazyProperties(
         get() = context.fileToPurenessInitializers
 
     override fun transformFlat(declaration: IrDeclaration): List<IrDeclaration>? {
+        if (context.configuration[PROPERTY_LAZY_INITIALISATION] != true) {
+            return null
+        }
+
         if (declaration !is IrField) return null
 
         val file = declaration.parent as? IrFile ?: return null

js/js.frontend/src/org/jetbrains/kotlin/js/config/JSConfigurationKeys.java

@@ -89,4 +89,7 @@ public class JSConfigurationKeys {
 
     public static final CompilerConfigurationKey<ErrorTolerancePolicy> ERROR_TOLERANCE_POLICY =
             CompilerConfigurationKey.create("set up policy to ignore compilation errors");
+
+    public static final CompilerConfigurationKey<Boolean> PROPERTY_LAZY_INITIALISATION =
+            CompilerConfigurationKey.create("enable property lazy initialisation");
 }