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Dec 12, 2023 •482 likes •2.04k views

Writing Your First Kotlin Compiler Plugin Kevin Most A brief intro Are these basically annotation processors? Annotation Processors: Compiler Plugins: Your code runs at compile-time Your code runs at compile-time Public,

  1. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = TODO() override fun getCompilerPluginId(): String = TODO() override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  2. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = TODO() override fun getCompilerPluginId(): String = TODO() override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  3. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = TODO() override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  4. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = TODO() override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  5. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = TODO() override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  6. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = "debuglog" override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  7. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = "debuglog" override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  8. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = "debuglog" override fun getPluginArtifact(): SubpluginArtifact = TODO() override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() }2 }1

  9. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = "debuglog" override fun getPluginArtifact(): SubpluginArtifact = SubpluginArtifact( groupId = "debuglog", artifactId = "kotlin-plugin", version = "0.0.1" ) override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() }2 }1

  10. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin : KotlinGradleSubplugin<AbstractCompile> { override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = "debuglog" override fun getPluginArtifact(): SubpluginArtifact = SubpluginArtifact( groupId = "debuglog", artifactId = "kotlin-plugin", version = "0.0.1" ) override fun apply(project: Project, /*...*/): List<SubpluginOption> { TODO() } }

  11. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin1:1KotlinGradleSubplugin<AbstractCompile>1{1 override fun isApplicable( project: Project, task: AbstractCompile ): Boolean = project.plugins.hasPlugin(DebugLogGradlePlugin::class.java) override fun getCompilerPluginId(): String = "debuglog" override fun getPluginArtifact(): SubpluginArtifact = SubpluginArtifact( groupId = "debuglog", artifactId = "kotlin-plugin", version = "0.0.1" ) override fun apply(project: Project, /*...*/): List<SubpluginOption>1{ TODO() }2 }1

  12. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin1:1KotlinGradleSubplugin<AbstractCompile>1{1 // other method impls override fun apply(project: Project, /*...*/): List<SubpluginOption>1{ TODO()Z }2 }1

  13. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin1:1KotlinGradleSubplugin<AbstractCompile>1{1 // other method impls override fun apply(project: Project, /*...*/): List<SubpluginOption>1{ val extension = project.extensions.findByType<DebugLogGradleExtension>() ?: DebugLogGradleExtension() if (extension.enabled && extension.annotations.isEmpty()) error("DebugLog is enabled, but no annotations were set") val annotationOptions = extension.annotations .map { SubpluginOption(key = "debugLogAnnotation", value = it ) } val enabledOption = SubpluginOption( key = "enabled", value = extension.enabled.toString()) return annotationOptions + enabledOption }2 }1

  14. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin1:1KotlinGradleSubplugin<AbstractCompile>1{1 // other method impls override fun apply(project: Project, /*...*/): List<SubpluginOption>1{ val extension = project.extensions.findByType<DebugLogGradleExtension>() ?: DebugLogGradleExtension() if (extension.enabled && extension.annotations.isEmpty()) error("DebugLog is enabled, but no annotations were set") val annotationOptions = extension.annotations .map { SubpluginOption(key = "debugLogAnnotation", value = it ) } val enabledOption = SubpluginOption( key = "enabled", value = extension.enabled.toString()) return annotationOptions + enabledOption }2 }1

  15. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin1:1KotlinGradleSubplugin<AbstractCompile>1{1 // other method impls override fun apply(project: Project, /*...*/): List<SubpluginOption>1{ val extension = project.extensions.findByType<DebugLogGradleExtension>() ?: DebugLogGradleExtension() if (extension.enabled && extension.annotations.isEmpty()) error("DebugLog is enabled, but no annotations were set") val annotationOptions = extension.annotations .map { SubpluginOption(key = "debugLogAnnotation", value = it ) } val enabledOption = SubpluginOption( key = "enabled", value = extension.enabled.toString()) return annotationOptions + enabledOption }2 }1

  16. @AutoService(KotlinGradleSubplugin::class) // don't forget! class DebugLogGradleSubplugin1:1KotlinGradleSubplugin<AbstractCompile>1{1 // other method impls override fun apply(project: Project, /*...*/): List<SubpluginOption>1{ val extension = project.extensions.findByType<DebugLogGradleExtension>() ?: DebugLogGradleExtension() if (extension.enabled && extension.annotations.isEmpty()) error("DebugLog is enabled, but no annotations were set") val annotationOptions = extension.annotations .map { SubpluginOption(key = "debugLogAnnotation", value = it ) } val enabledOption = SubpluginOption( key = "enabled", value = extension.enabled.toString()) return annotationOptions + enabledOption }2 }1

  17. Plugin Subplugin CommandLineProcessor ComponentRegistrar Extension Extension

  18. kotlin-plugin/build.gradle apply plugin: "org.jetbrains.kotlin.jvm" apply plugin: "kotlin-kapt" dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$ktVersion" compileOnly "org.jetbrains.kotlin:kotlin-compiler-embeddable:$ktVersion" compileOnly "com.google.auto.service:auto-service:1.0-rc4" kapt "com.google.auto.service:auto-service:1.0-rc4" }

  19. kotlin-plugin/build.gradle apply plugin: "org.jetbrains.kotlin.jvm" apply plugin: "kotlin-kapt" dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$ktVersion" compileOnly "org.jetbrains.kotlin:kotlin-compiler-embeddable:$ktVersion" compileOnly "com.google.auto.service:auto-service:1.0-rc4" kapt "com.google.auto.service:auto-service:1.0-rc4" }

  20. kotlin-plugin/build.gradle apply plugin: "org.jetbrains.kotlin.jvm" apply plugin: "kotlin-kapt" dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$ktVersion" compileOnly "org.jetbrains.kotlin:kotlin-compiler-embeddable:$ktVersion" compileOnly "com.google.auto.service:auto-service:1.0-rc4" kapt "com.google.auto.service:auto-service:1.0-rc4" }

  21. kotlin-plugin/build.gradle apply plugin: "org.jetbrains.kotlin.jvm" apply plugin: "kotlin-kapt" dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib:$ktVersion" compileOnly "org.jetbrains.kotlin:kotlin-compiler-embeddable:$ktVersion" compileOnly "com.google.auto.service:auto-service:1.0-rc4" kapt "com.google.auto.service:auto-service:1.0-rc4" }

  22. Plugin Subplugin CommandLineProcessor ComponentRegistrar Extension Extension

  23. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = TODO() override val pluginOptions: Collection<CliOption> = listOf( ) override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() } }

  24. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = TODO() override val pluginOptions: Collection<CliOption> = listOf( ) override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() } }

  25. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( ) override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() } }

  26. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( ) override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() } }

  27. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( )P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() }2 }1

  28. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() }2 }1

  29. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() } }

  30. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) { TODO() } }

  31. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) = when (option.name) { } }

  32. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) = when (option.name) { "enabled" -> configuration.put(KEY_ENABLED, value.toBoolean()) }2 }1

  33. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) = when (option.name) { "enabled" -> configuration.put(KEY_ENABLED, value.toBoolean()) "debugLogAnnotation" -> configuration.appendList(KEY_ANNOTATIONS, value) }2 }1

  34. @AutoService(CommandLineProcessor::class) class DebugLogCommandLineProcessor : CommandLineProcessor { override val pluginId: String = "debuglog" // same as ID from subplugin override val pluginOptions: Collection<CliOption> = listOf( CliOption("enabled", "<true|false>", "whether plugin is enabled"), CliOption( "debugLogAnnotation", "<fqname>", "debug-log annotation names", required = true, allowMultipleOccurrences = true))P override fun processOption( option: CliOption, value: String, configuration: CompilerConfiguration ) = when (option.name) { "enabled" -> configuration.put(KEY_ENABLED, value.toBoolean()) "debugLogAnnotation" -> configuration.appendList(KEY_ANNOTATIONS, value) else -> error("Unexpected config option ${option.name}") }2 }1

  35. Plugin Subplugin CommandLineProcessor ComponentRegistrar Extension Extension

  36. @AutoService(ComponentRegistrar::class) class DebugLogComponentRegistrar : ComponentRegistrar { override fun registerProjectComponents( project: MockProject, configuration: CompilerConfiguration ) { if (configuration[KEY_ENABLED] == false) { return } ClassBuilderInterceptorExtension.registerExtension( project, DebugLogClassGenerationInterceptor( debugLogAnnotations = configuration[KEY_ANNOTATIONS] ?: error("debuglog plugin requires at least one annotation class option passed to it") ) ) } }

  37. @AutoService(ComponentRegistrar::class) class DebugLogComponentRegistrar : ComponentRegistrar { override fun registerProjectComponents( project: MockProject, configuration: CompilerConfiguration ) { if (configuration[KEY_ENABLED] == false) { return } ClassBuilderInterceptorExtension.registerExtension( project, DebugLogClassGenerationInterceptor( debugLogAnnotations = configuration[KEY_ANNOTATIONS] ?: error("debuglog plugin requires at least one annotation class option passed to it") ) ) } }

  38. Plugin Subplugin CommandLineProcessor ComponentRegistrar Extension Extension

  39. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassGenerationInterceptor.kt class DebugLogClassGenerationInterceptor( val debugLogAnnotations: List<String> ) : ClassBuilderInterceptorExtension { override fun interceptClassBuilderFactory( interceptedFactory: ClassBuilderFactory, bindingContext: BindingContext, diagnostics: DiagnosticSink ): ClassBuilderFactory = TODO() }

  40. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassGenerationInterceptor.kt class DebugLogClassGenerationInterceptor( val debugLogAnnotations: List<String> ) : ClassBuilderInterceptorExtension { override fun interceptClassBuilderFactory( interceptedFactory: ClassBuilderFactory, bindingContext: BindingContext, diagnostics: DiagnosticSink ): ClassBuilderFactory = object: ClassBuilderFactory by interceptedFactory }1

  41. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassGenerationInterceptor.kt class DebugLogClassGenerationInterceptor( val debugLogAnnotations: List<String> ) : ClassBuilderInterceptorExtension { override fun interceptClassBuilderFactory( interceptedFactory: ClassBuilderFactory, bindingContext: BindingContext, diagnostics: DiagnosticSink ): ClassBuilderFactory = object: ClassBuilderFactory by interceptedFactory { override fun newClassBuilder(origin: JvmDeclarationOrigin) = DebugLogClassBuilder( annotations = debugLogAnnotations, delegateBuilder = interceptedFactory.newClassBuilder(origin)) } }1

  42. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt private class DebugLogClassBuilder( val annotations: List<String>, delegateBuilder: ClassBuilder ) : DelegatingClassBuilder(delegateBuilder) { override fun newMethod( origin: JvmDeclarationOrigin, access: Int, name: String, desc: String, signature: String?, exceptions: Array<out String>? ): MethodVisitor { }1 }2

  43. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt private class DebugLogClassBuilder( val annotations: List<String>, delegateBuilder: ClassBuilder ) : DelegatingClassBuilder(delegateBuilder) { override fun newMethod( origin: JvmDeclarationOrigin,... ): MethodVisitor { }1 }2

  44. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt private class DebugLogClassBuilder( val annotations: List<String>, delegateBuilder: ClassBuilder ) : DelegatingClassBuilder(delegateBuilder) { override fun newMethod( origin: JvmDeclarationOrigin,... ): MethodVisitor { val original = super.newMethod(origin, ...) val function = origin.descriptor as? FunctionDescriptor ?: return original if (annotations.none { descriptor.annotations.hasAnnotation( it ) } ) { return original } }1 }2

  45. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt private class DebugLogClassBuilder( val annotations: List<String>, delegateBuilder: ClassBuilder ) : DelegatingClassBuilder(delegateBuilder) { override fun newMethod( origin: JvmDeclarationOrigin,... ): MethodVisitor { val original = super.newMethod(origin, ...) val function = origin.descriptor as? FunctionDescriptor ?: return original if (annotations.none { descriptor.annotations.hasAnnotation( it ) } ) { return original } return object : MethodVisitor(Opcodes.ASM5, original) { }3 }1 }2

  46. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt return object : MethodVisitor(Opcodes.ASM5, original) { }3

  47. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt return object : MethodVisitor(Opcodes.ASM5, original) { override fun visitCode() { super.visitCode() InstructionAdapter(this).apply { TODO("on method entry") } }4 }3

  48. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt return object : MethodVisitor(Opcodes.ASM5, original) { override fun visitCode() { super.visitCode() InstructionAdapter(this).apply { TODO("on method entry") } }4 override fun visitInsn(opcode: Int) { when (opcode) { RETURN /* void */, ARETURN /* object */, IRETURN /* int */ -> { InstructionAdapter(this).apply { TODO("on method exit") } } } super.visitInsn(opcode) } }3

  49. What now? • You write bytecode • Uses the ObjectWeb ASM API • Neither related to ASM (assembly) or Web ASM (wasm) in any way • An API for modifying JVM bytecode • The JVM is a stack machine • One stack that methods operate upon • You can also read arbitrary variables from the Local Variable Array

  50. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  51. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  52. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; return value of v1() NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  53. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD return value of v2() ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; return value of v1() NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  54. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD return value of v2() ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; return value of v1() v1() + v2() NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  55. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; v1() + v2() NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  56. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  57. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  58. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } StringBuilder INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  59. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } StringBuilder INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  60. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } "sum of values was " INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  61. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } "sum of values was " INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  62. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  63. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } v1() + v2() INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  64. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } v1() + v2() INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  65. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  66. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD StringBuilder String ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  67. What does bytecode look like? fun printSimpleSum() { val sum = v1() + v2() println("sum of values was $sum") } INVOKESTATIC myapp/RunnerKt.v1 ()I INVOKESTATIC myapp/RunnerKt.v2 ()I IADD String ISTORE 1 GETSTATIC j/l/System.out : Lj/io/PrintStream; stdout PrintStream NEW j/l/StringBuilder DUP INVOKESPECIAL j/l/StringBuilder.<init> ()V LDC "sum of values was " INVOKEVIRTUAL j/l/StringBuilder.append (Lj/l/String;)Lj/l/StringBuilder; ILOAD 1 INVOKEVIRTUAL j/l/StringBuilder.append (I)Lj/l/StringBuilder; INVOKEVIRTUAL j/l/StringBuilder.toString ()Lj/l/String; INVOKEVIRTUAL j/io/PrintStream.println (Lj/l/String;)V

  68. Remember the goal fun prime(n: Int): Long { println(" ⇢ prime(n=$n)") val startTime = System.currentTimeMillis() val result = primeNumberSequence.take(n).last() val timeToRun = System.currentTimeMillis() - startTime println(" ⇠ prime [ran in $timeToRun ms]") return result } @DebugLog fun prime(n: Int): Long = primeNumberSequence.take(n).last()

  69. Back to our MethodVisitor!

  70. kotlin-plugin/src/main/kotlin/debuglog/DebugLogClassBuilder.kt return object : MethodVisitor(Opcodes.ASM5, original) { override fun visitCode() { super.visitCode() InstructionAdapter(this).apply { TODO("on method entry") } }4 override fun visitInsn(opcode: Int) { when (opcode) { RETURN , ARETURN, IRETURN -> { InstructionAdapter(this).apply { TODO("on method exit") } } } super.visitInsn(opcode) } }3

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