JetBrains Open-Sources KotlinLLM: Smart Macros That Generate Kotlin Source Code at Runtime and Hot-Reload It Through JDI
JetBrains Research Open-Sources KotlinLLM. KotlinLLM is an IntelliJ IDEA plugin for Kotlin/JVM projects that adds a language feature called Smart macros. A Smart macro is a regular Kotlin function call whose body is generated Kotlin code. The public API is deliberately small. asLlm<F, T>(from, hint) converts an input of type F into a typed value T, such as a data class, enum, list, or primitive. mockLlm<T>() generates a stateful implementation of an interface T, whose behavior depends on
Get smart on it
KotlinLLM is an IntelliJ IDEA plugin that uses AI to generate Kotlin code automatically through "Smart macros," which are function calls whose bodies are created by a language model at runtime. When a program runs, the plugin monitors these macro calls, captures runtime values if the generated code doesn't match actual scenarios, sends that information to an LLM for correction, and then reloads the updated code without restarting. The system is described as a research prototype rather than production-ready software, though the generated code itself can be deployed as ordinary Kotlin without requiring the plugin or additional LLM calls once behavior has been created.
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