I've been drooling over the new Fir plugin api and...

# compiler

[rnett]

I've been drooling over the new Fir plugin api and had a few questions:
1. Will it make it into 1.4? In particular FirDeclarationGenerationExtension and the others that didn't make it into the RC
2. Is defining method/class bodies allowed in those methods? I.e. can I define a method body in FirDeclarationGenerationExtension.generateMembers? The AllOpen examples don't, and generateMembersForGeneratedClass is a thing instead of just adding members to the class.
3. Will using the Fir extensions replace SyntheticResolveExtension with regards to having added definitions show up in the IDE (it sure looks like it)?

[Roman Artemev [JB]]

1, 2 - cc @dmitriy.novozhilov
3 - Yes, that is a plan afaik

[dmitriy.novozhilov]

Hi @rnett.
Fir extensions which you mention in first two questions are part of prototype of compiler API for new compiler frontend (FIR).
Those extensions, as a Fir itself, are not ready for using and they won't for long time
So, answering first question, those extensions won't we 1.4 (actually they will, but you can not use them).

[dmitriy.novozhilov]

About second question: main idea that you shouldn't generate declaration body for frontend declarations. Bodies should be generated for IR declarations which are created from FIR decelerations

[rnett]

Ok, thanks, that makes sense. Is FIR "not ready for using" like IR is currently (you can use it but stuff will break), or will it not work at all?

[dmitriy.novozhilov]

It almost (for ~99.999%) works on "green" code and for 92% correctly supports conversion ftom FIR to backend IR, so if you have correct project there is a big possibility that compiler with FIR can compile your code

[dmitriy.novozhilov]

But there are many things which are not implemented in FIR yet:
- a lot of compiler checks for warnings/errors
- MPP
- properly tested compiler API
- IDE plugin which working with FIR
- something what i forgot

[dmitriy.novozhilov]

You can try FIR with -Xuse-fir flag of you want. Note that it's better try it on nightly compiler builds, not release ones (because FIR state in release branches is outdated)

[dmitriy.novozhilov]

You can download artifacts manually from buildserver to your mavenLocal
Builds here are triggered by every push in master of kotlin repo
https://teamcity.jetbrains.com/buildConfiguration/Kotlin_KotlinPublic_Aggregate?mode=builds

[dmitriy.novozhilov]

As I know there is a way to setup teamcity as gradle repo, but I don't know exactly how