diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/CodeGenerator.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/CodeGenerator.kt
index cb58c7d7554..7ff3dd811a3 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/CodeGenerator.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/CodeGenerator.kt
@@ -164,6 +164,7 @@ internal class CodeGenerator(override val context:Context) : ContextUtils {
         = LLVMPositionBuilderAtEnd(context.llvmBuilder, bbLabel)
 
     fun ret(value: LLVMOpaqueValue?) = LLVMBuildRet(context.llvmBuilder, value)
+    fun  unreachable(): LLVMOpaqueValue? = LLVMBuildUnreachable(context.llvmBuilder)
 }
 
 
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/Context.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/Context.kt
index c6c61b57756..f30a7e5c03f 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/Context.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/Context.kt
@@ -30,6 +30,7 @@ internal class Context(val irModule: IrModuleFragment, val runtime: Runtime, val
     val lookupOpenMethodFunction = importRtFunction("LookupOpenMethod")
     val isInstanceFunction = importRtFunction("IsInstance")
     val checkInstanceFunction = importRtFunction("CheckInstance")
+    val throwExceptionFunction = importRtFunction("ThrowException")
 
     fun dispose() {
         LLVMDisposeBuilder(llvmBuilder)
diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt
index 4b767885513..c5516c87bc7 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/IrToBitcode.kt
@@ -201,6 +201,13 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
 
     //-------------------------------------------------------------------------//
 
+    override fun visitThrow(expression: IrThrow) {
+        logger.log("visitThrow                 : ${ir2string(expression)}")
+        evaluateExpression("", expression)
+    }
+
+    //-------------------------------------------------------------------------//
+
     override fun visitFunction(declaration: IrFunction) {
         logger.log("visitFunction                  : ${ir2string(declaration)}")
         codegen.function(declaration)
@@ -328,6 +335,7 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
             is IrBlock           -> return evaluateBlock       (                 value)
             is IrExpressionBody  -> return evaluateExpression  (tmpVariableName, value.expression)
             is IrWhen            -> return evaluateWhen        (tmpVariableName, value)
+            is IrThrow           -> return evaluateThrow       (tmpVariableName, value)
             null                 -> return null
             else                 -> {
                 TODO()
@@ -337,6 +345,15 @@ internal class CodeGeneratorVisitor(val context: Context) : IrElementVisitorVoid
 
     //-------------------------------------------------------------------------//
 
+    private fun evaluateThrow(tmpVariableName: String, expression: IrThrow): LLVMOpaqueValue? {
+        val objPointer = evaluateExpression(codegen.newVar(), expression.value)
+        val objHeaderPtr = codegen.bitcast(kObjHeaderPtr, objPointer!!, codegen.newVar())
+        val args = listOf(objHeaderPtr)                         // Create arg list.
+        return codegen.call(context.throwExceptionFunction, args, "")
+    }
+
+    //-------------------------------------------------------------------------//
+
     private fun evaluateWhen(tmpVariableName:String, expression: IrWhen): LLVMOpaqueValue? {
         logger.log("evaluateWhen               : ${ir2string(expression)}")
         var bbExit:LLVMOpaqueBasicBlock? = null             // By default "when" does not have "exit".