[FIR2IR] Support callables in signature composer

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrSignatureComposer.kt

@@ -6,8 +6,10 @@
 package org.jetbrains.kotlin.fir.backend
 
 import org.jetbrains.kotlin.fir.declarations.FirDeclaration
+import org.jetbrains.kotlin.fir.declarations.FirProperty
 import org.jetbrains.kotlin.ir.util.IdSignature
 
 interface Fir2IrSignatureComposer {
     fun composeSignature(declaration: FirDeclaration): IdSignature
+    fun composeAccessorSignature(property: FirProperty, isSetter: Boolean): IdSignature
 }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/signaturer/FirBasedSignatureComposer.kt

@@ -9,12 +9,14 @@ import org.jetbrains.kotlin.descriptors.Visibilities
 import org.jetbrains.kotlin.fir.FirElement
 import org.jetbrains.kotlin.fir.backend.Fir2IrSignatureComposer
 import org.jetbrains.kotlin.fir.declarations.*
+import org.jetbrains.kotlin.fir.symbols.CallableId
 import org.jetbrains.kotlin.fir.render
 import org.jetbrains.kotlin.fir.visitors.FirVisitorVoid
 import org.jetbrains.kotlin.ir.util.IdSignature
+import org.jetbrains.kotlin.name.FqName
+import org.jetbrains.kotlin.name.Name
 
 class FirBasedSignatureComposer : Fir2IrSignatureComposer {
-
     class SignatureBuilder : FirVisitorVoid() {
         var hashId: Long? = null
         var mask = 0L
@@ -24,22 +26,53 @@ class FirBasedSignatureComposer : Fir2IrSignatureComposer {
         }
 
         override fun visitElement(element: FirElement) {
-            TODO("Not yet implemented")
+            TODO("Should not be here")
         }
 
         override fun visitRegularClass(regularClass: FirRegularClass) {
             setExpected(regularClass.isExpect)
             //platformSpecificClass(descriptor)
         }
+
+        override fun visitConstructor(constructor: FirConstructor) {
+            setExpected(constructor.isExpect)
+        }
+
+        override fun visitSimpleFunction(simpleFunction: FirSimpleFunction) {
+            setExpected(simpleFunction.isExpect)
+        }
+
+        override fun visitProperty(property: FirProperty) {
+            setExpected(property.isExpect)
+        }
     }
 
+    private val CallableId.relativeCallableName: FqName
+        get() = className?.child(callableName) ?: FqName.topLevel(callableName)
+
     override fun composeSignature(declaration: FirDeclaration): IdSignature {
         val builder = SignatureBuilder()
         declaration.accept(builder)
-        if (declaration is FirRegularClass && declaration.visibility != Visibilities.LOCAL) {
-            val classId = declaration.classId
-            return IdSignature.PublicSignature(classId.packageFqName, classId.relativeClassName, builder.hashId, builder.mask)
+        return when {
+            declaration is FirRegularClass && declaration.visibility != Visibilities.LOCAL -> {
+                val classId = declaration.classId
+                IdSignature.PublicSignature(classId.packageFqName, classId.relativeClassName, builder.hashId, builder.mask)
+            }
+            declaration is FirCallableMemberDeclaration<*> -> {
+                val callableId = declaration.symbol.callableId
+                IdSignature.PublicSignature(callableId.packageName, callableId.relativeCallableName, builder.hashId, builder.mask)
+            }
+            else -> throw AssertionError("Unsupported FIR declaration in signature composer: ${declaration.render()}")
         }
-        throw AssertionError("Unsupported FIR declaration in signature composer: ${declaration.render()}")
+    }
+
+    override fun composeAccessorSignature(property: FirProperty, isSetter: Boolean): IdSignature {
+        val propertySignature = composeSignature(property) as IdSignature.PublicSignature
+        val accessorFqName = if (isSetter) {
+            propertySignature.declarationFqn.child(Name.special("<set-${property.name}>"))
+        } else {
+            propertySignature.declarationFqn.child(Name.special("<get-${property.name}>"))
+        }
+        return IdSignature.PublicSignature(propertySignature.packageFqn, accessorFqName, propertySignature.id, propertySignature.mask)
     }
 }