Upgrade to Kotlin 2.0.21

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        kotlin-version: [ 1.9.24 ]
+        kotlin-version: [ 2.0.21 ]
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
@@ -36,7 +36,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        kotlin-version: [ 1.9.24 ]
+        kotlin-version: [ 2.0.21 ]
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
@@ -162,8 +162,8 @@ jobs:
       # solution.
       fail-fast: false
       matrix:
-        kotlin-version: [ 1.9.24 ]
-        agp-version: [ 7.1.1, 7.2.0, 7.3.1 ]
+        kotlin-version: [ 2.0.21 ]
+        agp-version: [ 7.2.0, 7.3.1 ]
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
@@ -194,7 +194,7 @@ jobs:
       # solution.
       fail-fast: false
       matrix:
-        kotlin-version: [ 1.9.24 ]
+        kotlin-version: [ 2.0.21 ]
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4

annotations-optional/dependencies/runtimeClasspath.txt

@@ -1,3 +1,3 @@
 javax.inject:javax.inject:1
-org.jetbrains.kotlin:kotlin-stdlib:1.9.24
+org.jetbrains.kotlin:kotlin-stdlib:2.0.21
 org.jetbrains:annotations:13.0

annotations/dependencies/runtimeClasspath.txt

@@ -1,2 +1,2 @@
-org.jetbrains.kotlin:kotlin-stdlib:1.9.24
+org.jetbrains.kotlin:kotlin-stdlib:2.0.21
 org.jetbrains:annotations:13.0

build-logic/conventions/src/main/kotlin/com/squareup/anvil/conventions/BasePlugin.kt

@@ -108,6 +108,11 @@ abstract class BasePlugin : Plugin<Project> {
         }
 
         freeCompilerArgs.addAll(extension.kotlinCompilerArgs.get())
+        // We do not yet support K2, and KAPT + Kotlin 2.0 generates a warning about falling back to
+        // language version 1.9. Because we treat all warnings as errors, we need to suppress this
+        // specific warning to not fail the build. Related YT ticket:
+        // https://youtrack.jetbrains.com/issue/KT-68400/K2-w-Kapt-currently-doesnt-support-language-version-2.0.-Falling-back-to-1.9.
+        freeCompilerArgs.add("-Xsuppress-version-warnings")
 
         fun isTestSourceSet(): Boolean {
           val regex = """(?:gradle|Unit|[aA]ndroid)Test""".toRegex()

compiler-api/dependencies/runtimeClasspath.txt

@@ -1,8 +1,9 @@
 org.jetbrains.intellij.deps:trove4j:1.0.20200330
-org.jetbrains.kotlin:kotlin-bom:1.9.24
-org.jetbrains.kotlin:kotlin-compiler-embeddable:1.9.24
-org.jetbrains.kotlin:kotlin-daemon-embeddable:1.9.24
-org.jetbrains.kotlin:kotlin-reflect:1.9.24
-org.jetbrains.kotlin:kotlin-script-runtime:1.9.24
-org.jetbrains.kotlin:kotlin-stdlib:1.9.24
+org.jetbrains.kotlin:kotlin-bom:2.0.21
+org.jetbrains.kotlin:kotlin-compiler-embeddable:2.0.21
+org.jetbrains.kotlin:kotlin-daemon-embeddable:2.0.21
+org.jetbrains.kotlin:kotlin-reflect:2.0.21
+org.jetbrains.kotlin:kotlin-script-runtime:2.0.21
+org.jetbrains.kotlin:kotlin-stdlib:2.0.21
+org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.6.4
 org.jetbrains:annotations:13.0

compiler-api/src/main/java/com/squareup/anvil/compiler/api/AnvilCompilationException.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.descriptors.annotations.AnnotationDescriptor
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.util.render
 import org.jetbrains.kotlin.js.resolve.diagnostics.findPsi
 import org.jetbrains.kotlin.resolve.source.KotlinSourceElement
@@ -114,6 +115,7 @@ public class AnvilCompilationException(
       message: String,
       cause: Throwable? = null,
     ): AnvilCompilationException {
+      @OptIn(UnsafeDuringIrConstructionAPI::class)
       return AnvilCompilationException(
         message = message,
         cause = cause,

compiler-utils/dependencies/runtimeClasspath.txt

@@ -1,12 +1,14 @@
-com.google.dagger:dagger:2.51.1
-com.squareup:kotlinpoet-jvm:1.16.0
-com.squareup:kotlinpoet:1.16.0
+com.google.dagger:dagger:2.52
+com.squareup:kotlinpoet-jvm:1.18.1
+com.squareup:kotlinpoet:1.18.1
+jakarta.inject:jakarta.inject-api:2.0.1
 javax.inject:javax.inject:1
 org.jetbrains.intellij.deps:trove4j:1.0.20200330
-org.jetbrains.kotlin:kotlin-bom:1.9.24
-org.jetbrains.kotlin:kotlin-compiler-embeddable:1.9.24
-org.jetbrains.kotlin:kotlin-daemon-embeddable:1.9.24
-org.jetbrains.kotlin:kotlin-reflect:1.9.24
-org.jetbrains.kotlin:kotlin-script-runtime:1.9.24
-org.jetbrains.kotlin:kotlin-stdlib:1.9.24
+org.jetbrains.kotlin:kotlin-bom:2.0.21
+org.jetbrains.kotlin:kotlin-compiler-embeddable:2.0.21
+org.jetbrains.kotlin:kotlin-daemon-embeddable:2.0.21
+org.jetbrains.kotlin:kotlin-reflect:2.0.21
+org.jetbrains.kotlin:kotlin-script-runtime:2.0.21
+org.jetbrains.kotlin:kotlin-stdlib:2.0.21
+org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.6.4
 org.jetbrains:annotations:13.0

compiler-utils/src/testFixtures/java/com/squareup/anvil/compiler/internal/testing/AnvilCompilation.kt

@@ -13,13 +13,14 @@ import com.tschuchort.compiletesting.KotlinCompilation
 import com.tschuchort.compiletesting.PluginOption
 import com.tschuchort.compiletesting.SourceFile
 import com.tschuchort.compiletesting.addPreviousResultToClasspath
-import com.tschuchort.compiletesting.kspArgs
+import com.tschuchort.compiletesting.kspProcessorOptions
 import com.tschuchort.compiletesting.kspWithCompilation
 import com.tschuchort.compiletesting.symbolProcessorProviders
 import dagger.internal.codegen.ComponentProcessor
 import dagger.internal.codegen.KspComponentProcessor
 import org.intellij.lang.annotations.Language
 import org.jetbrains.kotlin.config.JvmTarget
+import org.jetbrains.kotlin.config.LanguageVersion
 import java.io.File
 import java.io.OutputStream
 import java.nio.file.Files
@@ -46,7 +47,7 @@ public class AnvilCompilation internal constructor(
     disableComponentMerging: Boolean = false,
     enableExperimentalAnvilApis: Boolean = true,
     trackSourceFiles: Boolean = true,
-    mode: AnvilCompilationMode = Embedded(emptyList()),
+    mode: AnvilCompilationMode = Embedded(),
     enableAnvil: Boolean = true,
   ): AnvilCompilation = apply {
     checkNotCompiled()
@@ -153,10 +154,11 @@ public class AnvilCompilation internal constructor(
           }
           // Run KSP embedded directly within this kotlinc invocation
           kspWithCompilation = true
-          kspArgs["will-have-dagger-factories"] = generateDaggerFactories.toString()
-          kspArgs["generate-dagger-factories"] = generateDaggerFactories.toString()
-          kspArgs["generate-dagger-factories-only"] = generateDaggerFactoriesOnly.toString()
-          kspArgs["disable-component-merging"] = disableComponentMerging.toString()
+          kspProcessorOptions["will-have-dagger-factories"] = generateDaggerFactories.toString()
+          kspProcessorOptions["generate-dagger-factories"] = generateDaggerFactories.toString()
+          kspProcessorOptions["generate-dagger-factories-only"] =
+            generateDaggerFactoriesOnly.toString()
+          kspProcessorOptions["disable-component-merging"] = disableComponentMerging.toString()
         }
       }
 
@@ -306,19 +308,20 @@ public fun compileAnvil(
   enableExperimentalAnvilApis: Boolean = true,
   trackSourceFiles: Boolean = true,
   previousCompilationResult: JvmCompilationResult? = null,
-  mode: AnvilCompilationMode = Embedded(emptyList()),
+  mode: AnvilCompilationMode = Embedded(),
   moduleName: String? = null,
   jvmTarget: JvmTarget? = null,
-  kotlinLanguageVersion: String? = null,
+  kotlinLanguageVersion: String = LanguageVersion.KOTLIN_1_9.versionString,
   expectExitCode: KotlinCompilation.ExitCode? = null,
   block: JvmCompilationResult.() -> Unit = { },
 ): JvmCompilationResult {
   return AnvilCompilation()
     .apply {
       kotlinCompilation.apply {
+        languageVersion = kotlinLanguageVersion
+        apiVersion = kotlinLanguageVersion
         this.allWarningsAsErrors = allWarningsAsErrors
         this.messageOutputStream = messageOutputStream
-        this.languageVersion = kotlinLanguageVersion
         if (workingDir != null) {
           this.workingDir = workingDir
         }

compiler-utils/src/testFixtures/java/com/squareup/anvil/compiler/internal/testing/AnvilCompilationMode.kt

@@ -9,7 +9,6 @@ import com.squareup.anvil.compiler.api.CodeGenerator
 public sealed class AnvilCompilationMode(public val analysisBackend: AnalysisBackend) {
   public data class Embedded(
     val codeGenerators: List<CodeGenerator> = emptyList(),
-    val useDagger: Boolean = false,
   ) : AnvilCompilationMode(EMBEDDED)
   public data class Ksp(
     val symbolProcessorProviders: List<SymbolProcessorProvider> = emptyList(),

compiler-utils/src/testFixtures/java/com/squareup/anvil/compiler/internal/testing/TestUtils.kt

@@ -11,7 +11,7 @@ import dagger.Component
 import dagger.Module
 import dagger.Provides
 import dagger.Subcomponent
-import org.jetbrains.kotlin.analysis.utils.collections.mapToSet
+import org.jetbrains.kotlin.utils.mapToSetOrEmpty
 import kotlin.reflect.KClass
 
 @ExperimentalAnvilApi
@@ -29,7 +29,7 @@ public fun Class<*>.moduleFactoryClass(
 
   val providesMethods = methodsOrCompanionMethods
     .filter { it.isAnnotationPresent(Provides::class.java) }
-    .mapToSet { it.name }
+    .mapToSetOrEmpty { it.name }
 
   assertWithMessage("No @Provides methods found in $this")
     .that(providesMethods)

compiler/dependencies/runtimeClasspath.txt

@@ -1,14 +1,16 @@
-com.google.dagger:dagger:2.51.1
-com.squareup:kotlinpoet-jvm:1.16.0
-com.squareup:kotlinpoet-ksp:1.16.0
-com.squareup:kotlinpoet:1.16.0
+com.google.dagger:dagger:2.52
+com.squareup:kotlinpoet-jvm:1.18.1
+com.squareup:kotlinpoet-ksp:1.18.1
+com.squareup:kotlinpoet:1.18.1
+jakarta.inject:jakarta.inject-api:2.0.1
 javax.annotation:jsr250-api:1.0
 javax.inject:javax.inject:1
 org.jetbrains.intellij.deps:trove4j:1.0.20200330
-org.jetbrains.kotlin:kotlin-bom:1.9.24
-org.jetbrains.kotlin:kotlin-compiler-embeddable:1.9.24
-org.jetbrains.kotlin:kotlin-daemon-embeddable:1.9.24
-org.jetbrains.kotlin:kotlin-reflect:1.9.24
-org.jetbrains.kotlin:kotlin-script-runtime:1.9.24
-org.jetbrains.kotlin:kotlin-stdlib:1.9.24
+org.jetbrains.kotlin:kotlin-bom:2.0.21
+org.jetbrains.kotlin:kotlin-compiler-embeddable:2.0.21
+org.jetbrains.kotlin:kotlin-daemon-embeddable:2.0.21
+org.jetbrains.kotlin:kotlin-reflect:2.0.21
+org.jetbrains.kotlin:kotlin-script-runtime:2.0.21
+org.jetbrains.kotlin:kotlin-stdlib:2.0.21
+org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.6.4
 org.jetbrains:annotations:13.0

compiler/src/main/java/com/squareup/anvil/compiler/IrContributionMerger.kt

@@ -26,6 +26,7 @@ import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrVararg
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.types.classFqName
 import org.jetbrains.kotlin.ir.types.classOrFail
 import org.jetbrains.kotlin.ir.types.classOrNull
@@ -49,6 +50,7 @@ import java.io.File
  * as super types to Dagger components annotated with `@MergeComponent` or `@MergeSubcomponent`.
  * This also supports arbitrary interface merging on interfaces annotated with `@MergeInterfaces`.
  */
+@OptIn(org.jetbrains.kotlin.backend.common.extensions.FirIncompatiblePluginAPI::class)
 internal class IrContributionMerger(
   private val classScanner: ClassScanner,
   private val moduleDescriptorFactory: RealAnvilModuleDescriptor.Factory,
@@ -160,6 +162,7 @@ internal class IrContributionMerger(
     irMergesFile.writeText(mergedText)
   }
 
+  @OptIn(UnsafeDuringIrConstructionAPI::class)
   private fun IrBuilderWithScope.addMergedModules(
     annotations: List<AnnotationReferenceIr>,
     moduleFragment: IrModuleFragment,
@@ -378,6 +381,7 @@ internal class IrContributionMerger(
     contributedModules: Sequence<IrClass>,
     annotations: List<AnnotationReferenceIr>,
   ): IrConstructorCall {
+    @OptIn(UnsafeDuringIrConstructionAPI::class)
     return irCallConstructor(
       callee = pluginContext
         .referenceConstructors(daggerAnnotationFqName.classIdBestGuess())
@@ -628,6 +632,7 @@ internal class IrContributionMerger(
 
     // Since we are modifying the state of the code here, this does not need to be reflected in
     // the associated [ClassReferenceIr] which is more of an initial snapshot.
+    @OptIn(UnsafeDuringIrConstructionAPI::class)
     clazz.owner.superTypes += toAdd
 
     // Return the list of added supertypes

compiler/src/main/java/com/squareup/anvil/compiler/IrUtils.kt

@@ -10,6 +10,7 @@ import org.jetbrains.kotlin.ir.declarations.IrDeclarationWithName
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
 import org.jetbrains.kotlin.ir.symbols.IrClassifierSymbol
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.types.IrSimpleType
 import org.jetbrains.kotlin.ir.types.classifierOrNull
 import org.jetbrains.kotlin.ir.types.typeOrNull
@@ -38,6 +39,7 @@ internal fun IrClass.requireClassId(): ClassId {
   )
 }
 
+@OptIn(UnsafeDuringIrConstructionAPI::class)
 internal fun IrClassSymbol.requireClassId(): ClassId = owner.requireClassId()
 
 internal val IrExpression.kclassUnwrapped: IrClassifierSymbol
@@ -53,6 +55,7 @@ internal val IrDeclarationWithName.fqName: FqName
     element = this,
   )
 
+@OptIn(UnsafeDuringIrConstructionAPI::class)
 internal val IrClassSymbol.fqName: FqName get() = owner.fqName
 
 // If we're evaluating an anonymous inner class, it cannot merge anything and will cause

compiler/src/main/java/com/squareup/anvil/compiler/codegen/reference/AnnotationArgumentReferenceIr.kt

@@ -7,6 +7,7 @@ import org.jetbrains.kotlin.ir.declarations.IrValueParameter
 import org.jetbrains.kotlin.ir.expressions.IrConst
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrVararg
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import kotlin.LazyThreadSafetyMode.NONE
 
 internal class AnnotationArgumentReferenceIr(
@@ -25,6 +26,7 @@ internal class AnnotationArgumentReferenceIr(
 
   // We currently special-case for Classes, but this is the spot we'll need to update if we need to
   // support primitives later on.
+  @OptIn(UnsafeDuringIrConstructionAPI::class)
   private fun findValue(): Any {
     (argumentExpression as? IrConst<*>)?.let {
       return it.value as Any

compiler/src/main/java/com/squareup/anvil/compiler/codegen/reference/AnnotationReferenceIr.kt

@@ -4,6 +4,7 @@ import com.squareup.anvil.compiler.api.AnvilCompilationException
 import com.squareup.anvil.compiler.internal.reference.AnnotationReference
 import org.jetbrains.kotlin.backend.common.extensions.IrPluginContext
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.util.getArgumentsWithIr
 import org.jetbrains.kotlin.ir.util.parentAsClass
 import org.jetbrains.kotlin.name.FqName
@@ -83,6 +84,7 @@ internal class AnnotationReferenceIr(
   }
 }
 
+@OptIn(UnsafeDuringIrConstructionAPI::class)
 internal fun IrConstructorCall.toAnnotationReference(
   context: IrPluginContext,
   declaringClass: ClassReferenceIr?,

compiler/src/main/java/com/squareup/anvil/compiler/codegen/reference/ClassReferenceIr.kt

@@ -13,12 +13,15 @@ import org.jetbrains.kotlin.backend.common.lower.parents
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
+import org.jetbrains.kotlin.ir.symbols.UnsafeDuringIrConstructionAPI
 import org.jetbrains.kotlin.ir.util.isInterface
 import org.jetbrains.kotlin.ir.util.packageFqName
+import org.jetbrains.kotlin.ir.util.parents
 import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 import kotlin.LazyThreadSafetyMode.NONE
 
+@OptIn(UnsafeDuringIrConstructionAPI::class)
 internal class ClassReferenceIr(
   val clazz: IrClassSymbol,
   val context: IrPluginContext,
@@ -31,6 +34,7 @@ internal class ClassReferenceIr(
     get() = fqName.shortName().asString()
 
   val enclosingClassesWithSelf: List<ClassReferenceIr> by lazy {
+    @OptIn(UnsafeDuringIrConstructionAPI::class)
     clazz.owner.parents
       .filterIsInstance<IrClass>()
       .map { it.symbol.toClassReference(context) }