Hey, Im trying to find the closest equivalent to `...

# compiler

[Strum355]

Hey, Im trying to find the closest equivalent to com.sun.tools.javac.code.Symbol from the javac compiler API. In another project Im working on, we're able to keep a mapping of Symbol to a String and be able to lookup a symbol, be it from a return type declaration, variable type etc and retrieve its String association. What would be the best option in the kotlin compiler API? Im walking the trees of KtFiles via KtTreeVisitorVoid invoked in analysisCompleted from an AnalysisHandlerExtension subclass 🙂

[Youssef Shoaib [MOD]]

using the various methods that need a bindingContext should do the trick. For example, there's KtExpression?.getType(bindingContext). There's also KtElement?.getResolvedCall(bindingContext). You can obtain a bindingContext inside of analysisCompleted by doing bindingTrace.bindingContext

[Youssef Shoaib [MOD]]

I make some use of both of those techniques over on my kotlin plugin project specifically in this AnalysisHandler. I basically use it to replace certain function calls to an external library by shadowing that function in a local file adding using AnalysisResult.RetryWithAdditionalRoots because I need the sources of those functions to perform my own inlining (long story but if you're interested check out KT-44530 but basically I'm implementing structs and currying and a bunch of other features with just one optimization).

[Youssef Shoaib [MOD]]

TL;DR: It sounds like you simply need to use expression.getType(bindingTrace.bindingContext)?.getJetTypeFqName()

[Strum355]

Im not sure getJetTypeFqName is quite what I want, as I build the associated string based on the "path" to the construct e.g. java/util/Arrays#asList(). for the asList method on the java.util.Arrays class. By having some class that lets me walk the "owner" hierarchy would be a generally good start, but I need the same class to be used (or derivable) at reference site to these symbols so I can extract the same string from the map
In slightly other words, I need to be able to get java/util/Arrays#asList(). from both the declaration site of that method as well as the usage/call/reference sites of that method

[Strum355]

And for that I will need to know the class type of the key of the map

[Youssef Shoaib [MOD]]

Then at call site you need to do

val resolvedCall = KtCallExpression.getResolvedCall(bindingTrace.bindingContext)

from that you can do resolvedCall.resultingDescriptor
and that resulting descriptor is usually a modified copy that includes info like filled in type parameters and so to get the "real" descriptor just call .original on that
then with that descriptor you can do things like call .containingDeclaration on it which, as the name suggests, gives you the declaration that this method was defined in, which you can then call .fqNameSafe on

[Strum355]

okay so it seems like DeclarationDescriptor is indeed the key type for the map. Was originally going that route but wasnt sure if it would be the right choice, but it seems like it is 🙂 thanks

[Youssef Shoaib [MOD]]

For declaration site you can then do this in visitNamedFunction: BindingUtils.getFunctionDescriptor(bindingTrace.bindingContext, expression) and just in case call .original on that and that should give you the same DeclarationDescriptor as the one you get from the resolved call