Use daemon if available for parsing files in JPS

compiler/daemon/daemon-common/src/org/jetbrains/kotlin/daemon/common/CompileService.kt

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.daemon.common
 
 import org.jetbrains.kotlin.cli.common.repl.*
+import org.jetbrains.kotlin.parsing.util.classesFqNames
 import java.io.File
 import java.io.Serializable
 import java.rmi.Remote
@@ -140,6 +141,12 @@ interface CompileService : Remote {
             compilationResults: CompilationResults?
     ): CallResult<Int>
 
+    @Throws(RemoteException::class)
+    fun classesFqNamesByFiles(
+        sessionId: Int,
+        sourceFiles: Set<File>
+    ): CallResult<Set<String>>
+
     @Throws(RemoteException::class)
     fun clearJarCache()
 

compiler/daemon/src/org/jetbrains/kotlin/daemon/CompileServiceImpl.kt

@@ -51,6 +51,7 @@ import org.jetbrains.kotlin.incremental.*
 import org.jetbrains.kotlin.incremental.components.LookupTracker
 import org.jetbrains.kotlin.load.kotlin.incremental.components.IncrementalCompilationComponents
 import org.jetbrains.kotlin.modules.Module
+import org.jetbrains.kotlin.parsing.util.classesFqNames
 import org.jetbrains.kotlin.progress.CompilationCanceledStatus
 import java.io.BufferedOutputStream
 import java.io.ByteArrayOutputStream
@@ -352,6 +353,15 @@ class CompileServiceImpl(
                 }
             }
 
+    override fun classesFqNamesByFiles(
+        sessionId: Int, sourceFiles: Set<File>
+    ): CompileService.CallResult<Set<String>> =
+        ifAlive {
+            withValidClientOrSessionProxy(sessionId) {
+                CompileService.CallResult.Good(classesFqNames(sourceFiles))
+            }
+        }
+
     override fun compile(
             sessionId: Int,
             compilerArguments: Array<out String>,