Hi folks :wave: a bit noobish question: I’m trying...

# compiler

[Jakub Ledwon]

Hi folks 👋 a bit noobish question: I’m trying to play around with compiler plugins. I built a simple plugin and ensured that it’s picked up in the other module that I use for testing it. Now I want to do some IR manipulations to learn more.
For starters I decided to create Test class which contains hi method and I annotated it with @MyTest. In my plugin I tried to rename this method to new_hi. I used kotlin-compile-testing to test it (in compiler plugin module) and I can see that the method name has changed. But when I add Test().new_hi() inside my test the test fails with Unresolved reference: new_hi. I also did the same thing in other module that is using the compiler plugin and came across the same problem. Moreover when I inspected build/classes…/Test I can see that there is still old name for hi method. Two questions regarding to this:
• How can I make my new_hi available in source files that use the plugin (it doesn’t have to have autocompletion and can be red in IDE, but just so it compiles and works)?
• What am I missing and what is happening behind the scenes that causes build/classes…/Test to remain unchanged and tests to fail?
I’m attaching my test code in 🧵

[Jakub Ledwon]

@Test
    fun test() {
        val file = SourceFile.kotlin(
            "main.kt", """
            import com.example.MyTest           

            @MyTest    
            class Test {
                fun hi () {
            
                }
            }

            fun main() {
                Test().new_hi() // this fails unless changed to Test().hi()
            }
        """.trimIndent()
        )

        val result = KotlinCompilation().apply {
            sources = listOf(file)
            useIR = true
            compilerPluginRegistrars = listOf(MyTestCompilerPluginRegistrar())
            inheritClassPath = true
        }.compile()

        val javaCode = result.javaCode("Test") // this has new_hi() as I expected
        assertEquals(KotlinCompilation.ExitCode.OK, result.exitCode)
    }

javaCode extension is based on TestUtils from debuglog repository

[shikasd]

You'll need to change it with frontend extensions (SyntheticResolveExtension or FirDeclarationGenerationExtension ) to make it available for other modules.

For IDE support, you'll have to create IDE plugin, I believe, that adds your compiler plugin to Kotlin resolution in IDE.

[Jakub Ledwon]

Thanks, one more thing as I’m still struggling a little bit, do I have to take any more steps? I introduced SyntheticResolveExtension in which I overrode generateSyntheticMethods to generate new method called helloWorld for classes with @MyTest. I also created IrGenerationExtension which uses visitFunction to set body of my newly created function. Again it works fine and in test I can see that this class is available in javaCode, but when I try to call it using Test().helloWorld() I get Unresolved reference: helloWorld again

[Jakub Ledwon]

My current code ⬇️ (sorry for not the greatest quality, but just trying to make it work 😅)

Untitled.cpp