K2 plugin (#116)

* Introduce K2 plugin

* Update IR backend

* Update to 2.0

* Fix for KT-70132

Author: Mr3zee

.gitignore

@@ -3,6 +3,7 @@
 
 # Ignore Gradle build output directory
 build
+.kotlin
 
 # idea files
 .idea/*

compiler-plugin/build.gradle.kts

@@ -24,6 +24,8 @@ kotlin {
 
 dependencies {
     compileOnly(libs.kotlin.compiler.embeddable)
+    implementation(projects.compilerPluginK2)
+    implementation(projects.compilerPluginCommon)
 }
 
 configureMetaTasks("cleanTest", "test")

compiler-plugin/compiler-plugin-common/build.gradle.kts

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2023-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+import org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode
+
+plugins {
+    alias(libs.plugins.conventions.jvm)
+    alias(libs.plugins.compiler.specific.module)
+}
+
+kotlin {
+    explicitApi = ExplicitApiMode.Disabled
+}
+
+dependencies {
+    compileOnly(libs.kotlin.compiler.embeddable)
+}

compiler-plugin/compiler-plugin-common/src/main/core/kotlinx/rpc/codegen/common/Names.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2023-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.rpc.codegen.common
+
+import org.jetbrains.kotlin.name.ClassId
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
+
+object ClassDeclarations {
+    val rpcInterface = ClassId(FqName("kotlinx.rpc"), Name.identifier("RPC"))
+
+    val serializableAnnotation = ClassId(FqName("kotlinx.serialization"), Name.identifier("Serializable"))
+    val contextualAnnotation = ClassId(FqName("kotlinx.serialization"), Name.identifier("Contextual"))
+
+    val flow = ClassId(FqName("kotlinx.coroutines.flow"), Name.identifier("Flow"))
+    val sharedFlow = ClassId(FqName("kotlinx.coroutines.flow"), Name.identifier("SharedFlow"))
+    val stateFlow = ClassId(FqName("kotlinx.coroutines.flow"), Name.identifier("StateFlow"))
+}
+
+object RpcNames {
+    val SERVICE_STUB_NAME: Name = Name.identifier("\$rpcServiceStub")
+
+    const val METHOD_CLASS_NAME_SUFFIX = "\$rpcMethod"
+}
+
+val Name.rpcMethodClassName: Name get() = Name.identifier("$identifier${RpcNames.METHOD_CLASS_NAME_SUFFIX}")
+val Name.rpcMethodName: Name get() = Name.identifier(identifier.removeSuffix(RpcNames.METHOD_CLASS_NAME_SUFFIX))

compiler-plugin/compiler-plugin-k2/build.gradle.kts

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2023-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+import org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode
+
+plugins {
+    alias(libs.plugins.conventions.jvm)
+    alias(libs.plugins.compiler.specific.module)
+}
+
+kotlin {
+    explicitApi = ExplicitApiMode.Disabled
+
+    compilerOptions {
+        freeCompilerArgs.add("-Xcontext-receivers")
+    }
+}
+
+dependencies {
+    compileOnly(libs.kotlin.compiler.embeddable)
+    compileOnly(libs.serialization.plugin)
+    implementation(projects.compilerPluginCommon)
+}

compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/FirGenerationKeys.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2023-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.rpc.codegen
+
+import org.jetbrains.kotlin.GeneratedDeclarationKey
+import org.jetbrains.kotlin.fir.declarations.FirDeclarationOrigin
+import org.jetbrains.kotlin.fir.symbols.FirBasedSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirClassSymbol
+import org.jetbrains.kotlin.fir.symbols.impl.FirFunctionSymbol
+import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlinx.serialization.compiler.fir.SerializationPluginKey
+
+internal class RPCGeneratedStubKey(
+    private val serviceName: Name,
+    val functions: List<FirFunctionSymbol<*>>,
+) : GeneratedDeclarationKey() {
+    override fun toString(): String {
+        return "RPCGeneratedStubKey.$serviceName"
+    }
+}
+
+internal val FirBasedSymbol<*>.generatedRpcServiceStubKey: RPCGeneratedStubKey? get() =
+    (origin as? FirDeclarationOrigin.Plugin)?.key as? RPCGeneratedStubKey
+
+internal class RPCGeneratedRpcMethodClassKey(
+    val rpcMethod: FirFunctionSymbol<*>,
+) : GeneratedDeclarationKey() {
+    val isObject = rpcMethod.valueParameterSymbols.isEmpty()
+
+    override fun toString(): String {
+        return "RPCGeneratedRpcMethodClassKey.${rpcMethod.name}"
+    }
+}
+
+internal val FirBasedSymbol<*>.generatedRpcMethodClassKey: RPCGeneratedRpcMethodClassKey? get() =
+    (origin as? FirDeclarationOrigin.Plugin)?.key as? RPCGeneratedRpcMethodClassKey
+
+internal object FirRpcServiceStubCompanionObject : GeneratedDeclarationKey() {
+    override fun toString(): String {
+        return "FirRpcServiceStubCompanionObject"
+    }
+}
+
+internal val FirClassSymbol<*>.isFromSerializationPlugin: Boolean get() {
+    return (origin as? FirDeclarationOrigin.Plugin)?.key is SerializationPluginKey
+}

compiler-plugin/compiler-plugin-k2/src/main/core/kotlinx/rpc/codegen/FirRPCExtensionRegistrar.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2023-2024 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package kotlinx.rpc.codegen
+
+import org.jetbrains.kotlin.cli.common.CLIConfigurationKeys
+import org.jetbrains.kotlin.cli.common.messages.MessageCollector
+import org.jetbrains.kotlin.config.CompilerConfiguration
+import org.jetbrains.kotlin.fir.extensions.FirExtensionRegistrar
+import org.jetbrains.kotlin.fir.extensions.FirDeclarationGenerationExtension.Factory as GFactory
+
+class FirRPCExtensionRegistrar(private val configuration: CompilerConfiguration) : FirExtensionRegistrar() {
+    override fun ExtensionRegistrarContext.configurePlugin() {
+        val logger = configuration.get(CLIConfigurationKeys.MESSAGE_COLLECTOR_KEY, MessageCollector.NONE)
+
+        +GFactory { FirRPCServiceGenerator(it, logger) }
+    }
+}