[WASM] Lazy properties initialization

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmBackendContext.kt

@@ -35,6 +35,7 @@ class WasmBackendContext(
     override val irBuiltIns: IrBuiltIns,
     val symbolTable: SymbolTable,
     val irModuleFragment: IrModuleFragment,
+    propertyLazyInitialization: Boolean,
     override val configuration: CompilerConfiguration,
 ) : JsCommonBackendContext {
     override val builtIns = module.builtIns
@@ -104,6 +105,9 @@ class WasmBackendContext(
     val wasmSymbols: WasmSymbols = WasmSymbols(this@WasmBackendContext, symbolTable)
     override val reflectionSymbols: ReflectionSymbols get() = wasmSymbols.reflectionSymbols
 
+    override val propertyLazyInitialization: PropertyLazyInitialization =
+        PropertyLazyInitialization(enabled = propertyLazyInitialization, eagerInitialization = wasmSymbols.eagerInitialization)
+
     override val ir = object : Ir<WasmBackendContext>(this, irModuleFragment) {
         override val symbols: Symbols<WasmBackendContext> = wasmSymbols
         override fun shouldGenerateHandlerParameterForDefaultBodyFun() = true

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmLoweringPhases.kt

@@ -496,6 +496,18 @@ private val forLoopsLoweringPhase = makeWasmModulePhase(
     description = "[Optimization] For loops lowering"
 )
 
+private val propertyLazyInitLoweringPhase = makeWasmModulePhase(
+    ::PropertyLazyInitLowering,
+    name = "PropertyLazyInitLowering",
+    description = "Make property init as lazy"
+)
+
+private val removeInitializersForLazyProperties = makeWasmModulePhase(
+    ::RemoveInitializersForLazyProperties,
+    name = "RemoveInitializersForLazyProperties",
+    description = "Remove property initializers if they was initialized lazily"
+)
+
 private val propertyAccessorInlinerLoweringPhase = makeWasmModulePhase(
     ::PropertyAccessorInlineLowering,
     name = "PropertyAccessorInlineLowering",
@@ -578,6 +590,8 @@ val wasmPhases = NamedCompilerPhase(
             returnableBlockLoweringPhase then
 
             forLoopsLoweringPhase then
+            propertyLazyInitLoweringPhase then
+            removeInitializersForLazyProperties then
             propertyAccessorInlinerLoweringPhase then
             stringConcatenationLowering then
 

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/WasmSymbols.kt

@@ -63,6 +63,8 @@ class WasmSymbols(
 
     internal val reflectionSymbols: WasmReflectionSymbols = WasmReflectionSymbols()
 
+    internal val eagerInitialization: IrClassSymbol = getIrClass(FqName("kotlin.EagerInitialization"))
+
     override val throwNullPointerException = getInternalFunction("THROW_NPE")
     override val throwISE = getInternalFunction("THROW_ISE")
     override val throwTypeCastException = getInternalFunction("THROW_CCE")

compiler/ir/backend.wasm/src/org/jetbrains/kotlin/backend/wasm/compiler.kt

@@ -29,6 +29,7 @@ fun compileWasm(
     phaseConfig: PhaseConfig,
     irFactory: IrFactory,
     exportedDeclarations: Set<FqName> = emptySet(),
+    propertyLazyInitialization: Boolean,
     emitNameSection: Boolean = false,
 ): WasmCompilerResult {
     val mainModule = depsDescriptors.mainModule
@@ -46,7 +47,7 @@ fun compileWasm(
     }
 
     val moduleDescriptor = moduleFragment.descriptor
-    val context = WasmBackendContext(moduleDescriptor, irBuiltIns, symbolTable, moduleFragment, configuration)
+    val context = WasmBackendContext(moduleDescriptor, irBuiltIns, symbolTable, moduleFragment, propertyLazyInitialization, configuration)
 
     // Load declarations referenced during `context` initialization
     allModules.forEach {