[IR] Support isAssignable in builders and serialization.

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt

@@ -843,7 +843,7 @@ class Fir2IrDeclarationStorage(
                     valueParameter.name, index, type,
                     if (!valueParameter.isVararg) null
                     else valueParameter.returnTypeRef.coneType.arrayElementType()?.toIrType(typeContext),
-                    valueParameter.isCrossinline, valueParameter.isNoinline, false
+                    valueParameter.isCrossinline, valueParameter.isNoinline
                 ).apply {
                     descriptor.bind(this)
                     if (valueParameter.defaultValue.let {

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt

@@ -172,7 +172,7 @@ fun IrFunction.copyReceiverParametersFrom(from: IrFunction) {
             startOffset, endOffset, origin,
             IrValueParameterSymbolImpl(newDescriptor),
             name,
-            index, type, varargElementType, isCrossinline, isNoinline, false
+            index, type, varargElementType, isCrossinline, isNoinline
         ).also { parameter ->
             parameter.parent = this@copyReceiverParametersFrom
             newDescriptor.bind(this)
@@ -422,9 +422,8 @@ fun IrFunction.createDispatchReceiverParameter(origin: IrDeclarationOrigin? = nu
         -1,
         parentAsClass.defaultType,
         null,
-        false,
+        isCrossinline = false,
-        false,
+        isNoinline = false
-        false
     ).apply {
         parent = this@createDispatchReceiverParameter
         newDescriptor.bind(this)

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/builders/declarations/declarationBuilders.kt

@@ -226,7 +226,7 @@ internal fun IrFactory.buildValueParameter(builder: IrValueParameterBuilder, par
         return createValueParameter(
             startOffset, endOffset, origin,
             IrValueParameterSymbolImpl(wrappedDescriptor),
-            name, index, type, varargElementType, isCrossInline, isNoinline, isHidden, false
+            name, index, type, varargElementType, isCrossInline, isNoinline, isHidden, isAssignable
         ).also {
             wrappedDescriptor.bind(it)
             it.parent = parent

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/declarations/IrValueParameterBuilder.kt

@@ -18,6 +18,7 @@ class IrValueParameterBuilder : IrDeclarationBuilder() {
     var isCrossInline = false
     var isNoinline = false
     var isHidden = false
+    var isAssignable = false
 
     fun updateFrom(from: IrValueParameter) {
         super.updateFrom(from)
@@ -28,5 +29,6 @@ class IrValueParameterBuilder : IrDeclarationBuilder() {
         isCrossInline = from.isCrossinline
         isNoinline = from.isNoinline
         isHidden = from.isHidden
+        isAssignable = from.isAssignable
     }
 }

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

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.ir.expressions.impl
 
+import org.jetbrains.kotlin.ir.declarations.IrValueParameter
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrSetValue
 import org.jetbrains.kotlin.ir.expressions.IrStatementOrigin
@@ -32,6 +33,24 @@ class IrSetValueImpl(
     override var value: IrExpression,
     override val origin: IrStatementOrigin?
 ) : IrSetValue() {
+
+    companion object {
+        private fun isVariableOrAssignable(symbol: IrValueSymbol): Boolean {
+            val declaration = symbol.owner
+            return if (declaration is IrValueParameter) {
+                declaration.isAssignable
+            } else {
+                true
+            }
+        }
+    }
+
+    init {
+        assert(isVariableOrAssignable(symbol)) {
+            "Only IrVariables and assignable IrValueParameters can be set"
+        }
+    }
+
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R {
         return visitor.visitSetValue(this, data)
     }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeepCopyIrTreeWithSymbols.kt

@@ -349,7 +349,7 @@ open class DeepCopyIrTreeWithSymbols(
             declaration.varargElementType?.remapType(),
             declaration.isCrossinline,
             declaration.isNoinline,
-            false
+            declaration.isAssignable
         ).apply {
             transformAnnotations(declaration)
             defaultValue = declaration.defaultValue?.transform()

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/RenderIrElement.kt

@@ -525,6 +525,7 @@ class RenderIrElementVisitor(private val normalizeNames: Boolean = false) : IrEl
             "vararg".takeIf { varargElementType != null },
             "crossinline".takeIf { isCrossinline },
             "noinline".takeIf { isNoinline },
+            "assignable".takeIf { isAssignable }
         )
 
     override fun visitLocalDelegatedProperty(declaration: IrLocalDelegatedProperty, data: Nothing?): String =

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

@@ -1010,7 +1010,7 @@ abstract class IrFileDeserializer(
                 flags.isCrossInline,
                 flags.isNoInline,
                 flags.isHidden,
-                false
+                flags.isAssignable
             ).apply {
                 if (proto.hasDefaultValue())
                     defaultValue = irFactory.createExpressionBody(deserializeExpressionBody(proto.defaultValue))

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrFlags.java

@@ -30,6 +30,7 @@ public class IrFlags extends Flags {
     // Parameters
 
     public static final BooleanFlagField IS_HIDDEN = FlagField.booleanAfter(IS_NOINLINE);
+    public static final BooleanFlagField IS_ASSIGNABLE = FlagField.booleanAfter(IS_HIDDEN);
 
     // Local variables
     public static final BooleanFlagField IS_LOCAL_VAR = FlagField.booleanAfter(HAS_ANNOTATIONS);
@@ -88,13 +89,15 @@ public class IrFlags extends Flags {
             boolean declaresDefaultValue,
             boolean isCrossinline,
             boolean isNoinline,
-            boolean isHidden
+            boolean isHidden,
+            boolean isAssignable
     ) {
         return HAS_ANNOTATIONS.toFlags(hasAnnotations)
                | DECLARES_DEFAULT_VALUE.toFlags(declaresDefaultValue)
                | IS_CROSSINLINE.toFlags(isCrossinline)
                | IS_NOINLINE.toFlags(isNoinline)
                | IS_HIDDEN.toFlags(isHidden)
+               | IS_ASSIGNABLE.toFlags(isAssignable)
                 ;
     }
 

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

@@ -143,11 +143,19 @@ inline class ValueParameterFlags(val flags: Long) {
     val isCrossInline: Boolean get() = IrFlags.IS_CROSSINLINE.get(flags.toInt())
     val isNoInline: Boolean get() = IrFlags.IS_NOINLINE.get(flags.toInt())
     val isHidden: Boolean get() = IrFlags.IS_HIDDEN.get(flags.toInt())
+    val isAssignable: Boolean get() = IrFlags.IS_ASSIGNABLE.get(flags.toInt())
 
     companion object {
         fun encode(param: IrValueParameter): Long {
             return param.run {
-                IrFlags.getValueParameterFlags(annotations.isNotEmpty(), defaultValue != null, isCrossinline, isNoinline, isHidden).toLong()
+                IrFlags.getValueParameterFlags(
+                    annotations.isNotEmpty(),
+                    defaultValue != null,
+                    isCrossinline,
+                    isNoinline,
+                    isHidden,
+                    isAssignable
+                ).toLong()
             }
         }
 

plugins/parcelize/parcelize-compiler/src/org/jetbrains/kotlin/parcelize/ir/IrParcelSerializers.kt

@@ -320,7 +320,7 @@ class IrSparseArrayParcelSerializer(
                     }
 
                     val dec = context.irBuiltIns.intClass.getSimpleFunction("dec")!!
-                    +irSetVar(remainingSizeTemporary.symbol, irCall(dec).apply {
+                    +irSet(remainingSizeTemporary.symbol, irCall(dec).apply {
                         dispatchReceiver = irGet(remainingSizeTemporary)
                     })
                 }

plugins/parcelize/parcelize-compiler/src/org/jetbrains/kotlin/parcelize/ir/irUtils.kt

@@ -140,7 +140,7 @@ inline fun IrBlockBuilder.forUntil(upperBound: IrExpression, loopBody: IrBlockBu
         body = irBlock {
             loopBody(indexTemporary)
             val inc = context.irBuiltIns.intClass.getSimpleFunction("inc")!!
-            +irSetVar(indexTemporary.symbol, irCall(inc).apply {
+            +irSet(indexTemporary.symbol, irCall(inc).apply {
                 dispatchReceiver = irGet(indexTemporary)
             })
         }