Add synthetic flags for IR

Author: Andrei Shikov

build.gradle

@@ -15,7 +15,3 @@ allprojects {
     group 'me.shika'
     version '1.0.1'
 }
-
-dependencies {
-    testCompile group: 'junit', name: 'junit', version: '4.12'
-}

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 #Wed Dec 18 22:46:33 GMT 2019
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.2.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStorePath=wrapper/dists

kotlin-plugin/src/main/kotlin/me/shika/generation/ObjectSerializationIRGeneration.kt

@@ -3,18 +3,23 @@ package me.shika.generation
 import org.jetbrains.kotlin.backend.common.BackendContext
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
 import org.jetbrains.kotlin.backend.common.lower.createIrBuilder
+import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.builders.declarations.addFunction
 import org.jetbrains.kotlin.ir.builders.irBlockBody
 import org.jetbrains.kotlin.ir.builders.irGetObject
 import org.jetbrains.kotlin.ir.builders.irReturn
 import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrDeclarationOriginImpl
 import org.jetbrains.kotlin.ir.declarations.IrFile
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
+import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.BindingContext
 
+private object ObjectSerializationOrigin : IrDeclarationOriginImpl("object-serialization-fix", isSynthetic = true)
+
 class ObjectSerializationIrGeneration : IrGenerationExtension {
     override fun generate(file: IrFile, backendContext: BackendContext, bindingContext: BindingContext) {
         file.acceptVoid(
@@ -27,7 +32,12 @@ class ObjectSerializationIrGeneration : IrGenerationExtension {
     }
 
     private fun fixSerializable(cls: IrClass, context: BackendContext) {
-        cls.addFunction(SERIALIZABLE_READ, context.irBuiltIns.anyNType).also { function ->
+        cls.addFunction {
+            name = Name.identifier(SERIALIZABLE_READ)
+            returnType = context.irBuiltIns.anyNType
+            visibility = Visibilities.PUBLIC
+            origin = ObjectSerializationOrigin
+        }.also { function ->
             function.body = context.createIrBuilder(function.symbol).irBlockBody {
                 +irReturn(irGetObject(cls.symbol))
             }

kotlin-plugin/src/test/kotlin/me/shika/ObjectSerializationFixTest.kt

@@ -70,6 +70,7 @@ class ObjectSerializationFixTest(enableIr: Boolean) {
         name == "readResolve"
             && parameterCount == 0
             && returnType == Object::class.java
+            && isSynthetic
 }
 
 fun String.source() = SourceFile.kotlin("Source.kt", this, trimIndent = true)