add isKotlinSourceElement method to Source interface in order to recognize kotlin source elements during compilation

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/components/JavaSourceElementFactoryImpl.kt

@@ -24,6 +24,8 @@ import org.jetbrains.kotlin.load.java.sources.JavaSourceElementFactory
 import org.jetbrains.kotlin.load.java.sources.JavaSourceElement
 
 private class JavaSourceElementImpl(override val javaElement: JavaElement) : PsiSourceElement, JavaSourceElement {
+    override fun isKotlinSourceElement(): Boolean = false
+
     override val psi: PsiElement?
         get() = (javaElement as JavaElementImpl<*>).getPsi()
 }

compiler/frontend/src/org/jetbrains/kotlin/resolve/source/KotlinSourceElement.kt

@@ -20,7 +20,9 @@ import org.jetbrains.kotlin.psi.JetElement
 import org.jetbrains.kotlin.descriptors.SourceElement
 import com.intellij.psi.PsiElement
 
-public class KotlinSourceElement(override val psi: JetElement) : PsiSourceElement
+public class KotlinSourceElement(override val psi: JetElement) : PsiSourceElement {
+    override fun isKotlinSourceElement(): Boolean = true
+}
 
 public fun JetElement?.toSourceElement(): SourceElement = if (this == null) SourceElement.NO_SOURCE else KotlinSourceElement(this)
 

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/kotlin/KotlinJvmBinarySourceElement.kt

@@ -19,5 +19,6 @@ package org.jetbrains.kotlin.load.kotlin
 import org.jetbrains.kotlin.descriptors.SourceElement
 
 public class KotlinJvmBinarySourceElement(public val binaryClass: KotlinJvmBinaryClass) : SourceElement {
+    override fun isKotlinSourceElement(): Boolean = false
     override fun toString() = javaClass.name + ": " + binaryClass.toString()
 }

core/descriptors.runtime/src/org/jetbrains/kotlin/load/java/components/RuntimeSourceElementFactory.kt

@@ -23,6 +23,8 @@ import org.jetbrains.kotlin.load.java.structure.reflect.ReflectJavaElement
 
 public object RuntimeSourceElementFactory : JavaSourceElementFactory {
     private class RuntimeSourceElement(override val javaElement: ReflectJavaElement) : JavaSourceElement {
+
+        override fun isKotlinSourceElement(): Boolean = false
         override fun toString() = javaClass.name + ": " + javaElement.toString()
     }
 

core/descriptors.runtime/src/org/jetbrains/kotlin/load/kotlin/reflect/ReflectAnnotationSource.kt

@@ -18,4 +18,6 @@ package org.jetbrains.kotlin.load.kotlin.reflect
 
 import org.jetbrains.kotlin.descriptors.SourceElement
 
-public class ReflectAnnotationSource(public val annotation: Annotation) : SourceElement
+public class ReflectAnnotationSource(public val annotation: Annotation) : SourceElement {
+    override fun isKotlinSourceElement(): Boolean = false
+}

core/descriptors/src/org/jetbrains/kotlin/descriptors/SourceElement.java

@@ -16,8 +16,18 @@
 
 package org.jetbrains.kotlin.descriptors;
 
+import kotlin.Deprecated;
+
 public interface SourceElement {
+    @Deprecated("This is a hack in order to preliminary support internal visibility in multi-module projects")
+    boolean isKotlinSourceElement();
+
     SourceElement NO_SOURCE = new SourceElement() {
+        @Override
+        public boolean isKotlinSourceElement() {
+            return false;
+        }
+
         @Override
         public String toString() {
             return "NO_SOURCE";