diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/ModuleIndex.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/ModuleIndex.kt
index 4cd7f713cd1..21fb20af825 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/ModuleIndex.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ir/ModuleIndex.kt
@@ -1,7 +1,9 @@
 package org.jetbrains.kotlin.backend.konan.ir
 
+import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrClass
+import org.jetbrains.kotlin.ir.declarations.IrFunction
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
@@ -16,6 +18,11 @@ class ModuleIndex(val module: IrModuleFragment) {
      */
     val classes: Map<ClassId, IrClass>
 
+    /**
+     * Contains all functions declared in [module]
+     */
+    val functions = mutableMapOf<FunctionDescriptor, IrFunction>()
+
     init {
         val map = mutableMapOf<ClassId, IrClass>()
 
@@ -33,6 +40,13 @@ class ModuleIndex(val module: IrModuleFragment) {
                 }
             }
 
+            override fun visitFunction(declaration: IrFunction) {
+                super.visitFunction(declaration)
+
+                val functionDescriptor = declaration.descriptor
+                functions[functionDescriptor] = declaration
+            }
+
         })
 
         classes = map
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt
index 29ab990175b..d5535a709bf 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/FunctionInlining.kt
@@ -11,7 +11,7 @@ import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
 
-class FunctionInlining(val context: Context) {
+internal class FunctionInlining(val context: Context) {
     fun inline(irFile: IrFile) {
         irFile.acceptVoid(object : IrElementVisitorVoid {
             override fun visitElement(element: IrElement) {