[IR] Clean up linker code

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrModuleDeserializer.kt

@@ -8,15 +8,12 @@ package org.jetbrains.kotlin.backend.common.serialization
 import org.jetbrains.kotlin.backend.common.serialization.encodings.BinarySymbolData
 import org.jetbrains.kotlin.builtins.functions.FunctionClassDescriptor
 import org.jetbrains.kotlin.descriptors.*
-import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.descriptors.IrAbstractFunctionFactory
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.descriptors.WrappedDeclarationDescriptor
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.util.IdSignature
-import org.jetbrains.kotlin.ir.util.IrExtensionGenerator
-import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.library.IrLibrary
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
@@ -205,9 +202,7 @@ class IrModuleDeserializerWithBuiltIns(
 
 open class CurrentModuleDeserializer(
     override val moduleFragment: IrModuleFragment,
-    override val moduleDependencies: Collection<IrModuleDeserializer>,
-    private val symbolTable: SymbolTable,
-    private val extensions: Collection<IrExtensionGenerator>
+    override val moduleDependencies: Collection<IrModuleDeserializer>
 ) : IrModuleDeserializer(moduleFragment.descriptor) {
     override fun contains(idSig: IdSignature): Boolean = false // TODO:
 
@@ -215,68 +210,5 @@ open class CurrentModuleDeserializer(
         error("Unreachable execution: there could not be back-links")
     }
 
-    override fun declareIrSymbol(symbol: IrSymbol) {
-        declareIrSymbolImpl(symbol)
-    }
-
-    private fun referenceParentDescriptor(descriptor: DeclarationDescriptor): IrSymbol {
-        return when (descriptor) {
-            is ClassDescriptor -> symbolTable.referenceClass(descriptor)
-            is PropertyDescriptor -> symbolTable.referenceProperty(descriptor)
-            is PackageFragmentDescriptor -> moduleFragment.files.single { it.symbol.descriptor === descriptor }.symbol
-            else -> error("Unexpected declaration parent $descriptor")
-        }
-    }
-
-    private fun declareIrDeclaration(symbol: IrSymbol): IrDeclaration {
-        for (extension in extensions) {
-            extension.declare(symbol)?.let { return it }
-        }
-
-        return declareIrDeclarationDefault(symbol)
-    }
-
-    private fun declareIrDeclarationDefault(symbol: IrSymbol): IrDeclaration {
-        return when (symbol) {
-            is IrClassSymbol -> symbolTable.declareClass(offset, offset, IrDeclarationOrigin.DEFINED, symbol.descriptor)
-            is IrConstructorSymbol -> symbolTable.declareConstructor(offset, offset, IrDeclarationOrigin.DEFINED, symbol.descriptor)
-            is IrSimpleFunctionSymbol -> symbolTable.declareSimpleFunction(offset, offset, IrDeclarationOrigin.DEFINED, symbol.descriptor)
-            is IrPropertySymbol -> symbolTable.declareProperty(offset, offset, IrDeclarationOrigin.DEFINED, symbol.descriptor)
-            is IrTypeAliasSymbol -> TODO("Implement type alias $symbol")
-            is IrEnumEntrySymbol -> symbolTable.declareEnumEntry(offset, offset, IrDeclarationOrigin.DEFINED, symbol.descriptor)
-            else -> error("Unexpected symbol $symbol")
-        }
-    }
-
-    private fun declareIrSymbolImpl(symbol: IrSymbol): IrSymbolOwner {
-        if (symbol.isBound) return symbol.owner
-        val descriptor = symbol.descriptor
-
-        assert(descriptor !is WrappedDeclarationDescriptor<*>)
-
-        val accessor = descriptor as? PropertyAccessorDescriptor
-
-        val parent = descriptor.containingDeclaration ?: error("Expect non-root declaration $descriptor")
-        val parentDeclaration = declareIrSymbolImpl(referenceParentDescriptor(parent)) as IrDeclarationContainer
-
-        val declaredDeclaration = declareIrDeclaration(symbol).also {
-            it.parent = parentDeclaration
-            if (accessor != null) {
-                val property = accessor.correspondingProperty
-                val irProperty = declareIrSymbolImpl(referenceParentDescriptor(property)) as IrProperty
-                val irAccessor = it as IrSimpleFunction
-                irAccessor.correspondingPropertySymbol = irProperty.symbol
-                if (accessor === property.getter) irProperty.getter = irAccessor
-                if (accessor === property.setter) irProperty.setter = irAccessor
-            } else {
-                parentDeclaration.declarations.add(it)
-            }
-        }
-
-        return declaredDeclaration as IrSymbolOwner
-    }
-
-    companion object {
-        private const val offset = UNDEFINED_OFFSET
-    }
+    override fun declareIrSymbol(symbol: IrSymbol) {}
 }

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/KotlinIrLinker.kt

@@ -491,6 +491,7 @@ abstract class KotlinIrLinker(
         moduleDeserializer.declareIrSymbol(symbol)
 
         deserializeAllReachableTopLevels()
+        if (!symbol.isBound) return null
         return descriptor
     }
 
@@ -521,15 +522,15 @@ abstract class KotlinIrLinker(
         return symbol.owner as IrDeclaration
     }
 
-    protected open fun createCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>, extensions: Collection<IrExtensionGenerator>): IrModuleDeserializer =
-        CurrentModuleDeserializer(moduleFragment, dependencies, symbolTable, extensions)
+    protected open fun createCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>): IrModuleDeserializer =
+        CurrentModuleDeserializer(moduleFragment, dependencies)
 
     override fun init(moduleFragment: IrModuleFragment?, extensions: Collection<IrExtensionGenerator>) {
         if (moduleFragment != null) {
             val currentModuleDependencies = moduleFragment.descriptor.allDependencyModules.map {
                 deserializersForModules[it] ?: error("No deserializer found for $it")
             }
-            val currentModuleDeserializer = createCurrentModuleDeserializer(moduleFragment, currentModuleDependencies, extensions)
+            val currentModuleDeserializer = createCurrentModuleDeserializer(moduleFragment, currentModuleDependencies)
             deserializersForModules[moduleFragment.descriptor] =
                 maybeWrapWithBuiltInAndInit(moduleFragment.descriptor, currentModuleDeserializer)
         }

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

@@ -36,12 +36,8 @@ class JsIrLinker(
     private inner class JsModuleDeserializer(moduleDescriptor: ModuleDescriptor, klib: IrLibrary, strategy: DeserializationStrategy) :
         KotlinIrLinker.BasicIrModuleDeserializer(moduleDescriptor, klib, strategy)
 
-    override fun createCurrentModuleDeserializer(
-        moduleFragment: IrModuleFragment,
-        dependencies: Collection<IrModuleDeserializer>,
-        extensions: Collection<IrExtensionGenerator>
-    ): IrModuleDeserializer {
-        val currentModuleDeserializer = super.createCurrentModuleDeserializer(moduleFragment, dependencies, extensions)
+    override fun createCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>): IrModuleDeserializer {
+        val currentModuleDeserializer = super.createCurrentModuleDeserializer(moduleFragment, dependencies)
         icData?.let {
             return CurrentModuleWithICDeserializer(currentModuleDeserializer, symbolTable, builtIns, it) { lib ->
                 JsModuleDeserializer(currentModuleDeserializer.moduleDescriptor, lib, currentModuleDeserializer.strategy)

compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt

@@ -18,7 +18,6 @@ import org.jetbrains.kotlin.ir.symbols.IrFieldSymbol
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.util.DeclarationStubGenerator
 import org.jetbrains.kotlin.ir.util.IdSignature
-import org.jetbrains.kotlin.ir.util.IrExtensionGenerator
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.library.IrLibrary
 import org.jetbrains.kotlin.load.java.descriptors.*
@@ -76,11 +75,11 @@ class JvmIrLinker(currentModule: ModuleDescriptor?, logger: LoggingContext, buil
     }
 
 
-    override fun createCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>, extensions: Collection<IrExtensionGenerator>): IrModuleDeserializer =
-        JvmCurrentModuleDeserializer(moduleFragment, dependencies, extensions)
+    override fun createCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>): IrModuleDeserializer =
+        JvmCurrentModuleDeserializer(moduleFragment, dependencies)
 
-    private inner class JvmCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>, extensions: Collection<IrExtensionGenerator>) :
-        CurrentModuleDeserializer(moduleFragment, dependencies, symbolTable, extensions) {
+    private inner class JvmCurrentModuleDeserializer(moduleFragment: IrModuleFragment, dependencies: Collection<IrModuleDeserializer>) :
+        CurrentModuleDeserializer(moduleFragment, dependencies) {
         override fun declareIrSymbol(symbol: IrSymbol) {
             val descriptor = symbol.descriptor