[IR] Prepare IrMemberAccessExpression for being autogenerated

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrExpressions.kt

@@ -68,11 +68,13 @@ fun IrExpression.isUnchanging(): Boolean =
 fun IrExpression.hasNoSideEffects(): Boolean =
     isUnchanging() || this is IrGetValue
 
-internal fun IrMemberAccessExpression<*>.throwNoSuchArgumentSlotException(kind: String, index: Int, total: Int): Nothing {
-    throw AssertionError(
-        "No such $kind argument slot in ${this::class.java.simpleName}: $index (total=$total)" +
-                (symbol.signature?.let { ".\nSymbol: $it" } ?: "")
-    )
+internal fun IrMemberAccessExpression<*>.checkArgumentSlotAccess(kind: String, index: Int, total: Int) {
+    if (index >= total) {
+        throw AssertionError(
+            "No such $kind argument slot in ${this::class.java.simpleName}: $index (total=$total)" +
+                    (symbol.signature?.let { ".\nSymbol: $it" } ?: "")
+        )
+    }
 }
 
 fun IrMemberAccessExpression<*>.copyTypeArgumentsFrom(other: IrMemberAccessExpression<*>, shift: Int = 0) {

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrMemberAccessExpression.kt

@@ -16,61 +16,54 @@ import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
  */
 abstract class IrMemberAccessExpression<S : IrSymbol> : IrDeclarationReference() {
     var dispatchReceiver: IrExpression? = null
+
     var extensionReceiver: IrExpression? = null
 
     abstract override val symbol: S
 
     abstract val origin: IrStatementOrigin?
 
-    protected abstract val typeArguments: Array<IrType?>
-    val typeArgumentsCount: Int get() = typeArguments.size
-
     protected abstract val valueArguments: Array<IrExpression?>
-    open val valueArgumentsCount: Int get() = valueArguments.size
 
-    fun getValueArgument(index: Int): IrExpression? {
-        if (index >= valueArgumentsCount) {
-            throw AssertionError("$this: No such value argument slot: $index")
-        }
-        return valueArguments[index]
-    }
+    protected abstract val typeArguments: Array<IrType?>
 
-    fun putValueArgument(index: Int, valueArgument: IrExpression?) {
-        if (index >= valueArgumentsCount) {
-            throw AssertionError("$this: No such value argument slot: $index")
-        }
-        valueArguments[index] = valueArgument
-    }
+    val valueArgumentsCount: Int
+        get() = valueArguments.size
 
-    fun getTypeArgument(index: Int): IrType? {
-        if (index >= typeArgumentsCount) {
-            throwNoSuchArgumentSlotException("type", index, typeArgumentsCount)
-        }
-        return typeArguments[index]
-    }
-
-    fun putTypeArgument(index: Int, type: IrType?) {
-        if (index >= typeArgumentsCount) {
-            throwNoSuchArgumentSlotException("type", index, typeArgumentsCount)
-        }
-        typeArguments[index] = type
-    }
+    val typeArgumentsCount: Int
+        get() = typeArguments.size
 
     override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
         dispatchReceiver?.accept(visitor, data)
         extensionReceiver?.accept(visitor, data)
-        if (valueArgumentsCount > 0) {
-            valueArguments.forEach { it?.accept(visitor, data) }
-        }
+        valueArguments.forEach { it?.accept(visitor, data) }
     }
 
     override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
         dispatchReceiver = dispatchReceiver?.transform(transformer, data)
         extensionReceiver = extensionReceiver?.transform(transformer, data)
-        if (valueArgumentsCount > 0) {
-            valueArguments.forEachIndexed { i, irExpression ->
-                valueArguments[i] = irExpression?.transform(transformer, data)
-            }
+        valueArguments.forEachIndexed { i, irExpression ->
+            valueArguments[i] = irExpression?.transform(transformer, data)
         }
     }
+
+    fun getValueArgument(index: Int): IrExpression? {
+        checkArgumentSlotAccess("value", index, valueArguments.size)
+        return valueArguments[index]
+    }
+
+    fun getTypeArgument(index: Int): IrType? {
+        checkArgumentSlotAccess("type", index, typeArguments.size)
+        return typeArguments[index]
+    }
+
+    fun putValueArgument(index: Int, valueArgument: IrExpression?) {
+        checkArgumentSlotAccess("value", index, valueArguments.size)
+        valueArguments[index] = valueArgument
+    }
+
+    fun putTypeArgument(index: Int, type: IrType?) {
+        checkArgumentSlotAccess("type", index, typeArguments.size)
+        typeArguments[index] = type
+    }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrLocalDelegatedPropertyReferenceImpl.kt

@@ -34,11 +34,14 @@ class IrLocalDelegatedPropertyReferenceImpl(
     override var setter: IrSimpleFunctionSymbol?,
     override val origin: IrStatementOrigin? = null,
 ) : IrLocalDelegatedPropertyReference() {
-    override val typeArguments: Array<IrType?> = emptyArray()
+    override val typeArguments: Array<IrType?>
+        get() = EMPTY_TYPE_ARGUMENTS
 
     override val valueArguments: Array<IrExpression?>
-        get() = throw UnsupportedOperationException("Property reference $symbol has no value arguments")
+        get() = EMPTY_VALUE_ARGUMENTS
 
-    override val valueArgumentsCount: Int
-        get() = 0
+    companion object {
+        private val EMPTY_TYPE_ARGUMENTS = emptyArray<IrType?>()
+        private val EMPTY_VALUE_ARGUMENTS = emptyArray<IrExpression?>()
+    }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/impl/IrPropertyReferenceImpl.kt

@@ -38,8 +38,9 @@ class IrPropertyReferenceImpl(
     override val typeArguments: Array<IrType?> = arrayOfNulls(typeArgumentsCount)
 
     override val valueArguments: Array<IrExpression?>
-        get() = throw UnsupportedOperationException("Property reference $symbol has no value arguments")
+        get() = EMPTY_VALUE_ARGUMENTS
 
-    override val valueArgumentsCount: Int
-        get() = 0
+    companion object {
+        private val EMPTY_VALUE_ARGUMENTS = emptyArray<IrExpression?>()
+    }
 }