Added used annotaions for functions that are used from JS

Interop/JsRuntime/src/main/kotlin/jsinterop.kt

@@ -7,12 +7,20 @@ typealias Arena = Int
 typealias Object = Int
 typealias Pointer = Int
 
+/**
+ * Used annotation is required to preserve functions
+ * from internalization and DCE
+ */
+
+@Used
 @SymbolName("Konan_js_allocateArena")
 external public fun allocateArena(): Arena
 
+@Used
 @SymbolName("Konan_js_freeArena")
 external public fun freeArena(arena: Arena)
 
+@Used
 @SymbolName("Konan_js_pushIntToArena")
 external public fun pushIntToArena(arena: Arena, value: Int)
 
@@ -24,12 +32,15 @@ fun doubleUpper(value: Double): Int =
 fun doubleLower(value: Double): Int =
     (value.toBits() and 0x00000000ffffffff) .toInt()
 
+@Used
 @SymbolName("ReturnSlot_getDouble")
 external public fun ReturnSlot_getDouble(): Double
 
+@Used
 @SymbolName("Kotlin_String_utf16pointer")
 external public fun stringPointer(message: String): Pointer
 
+@Used
 @SymbolName("Kotlin_String_utf16length")
 external public fun stringLengthBytes(message: String): Int
 
@@ -40,6 +51,7 @@ fun <R> wrapFunction(func: KtFunction<R>): Int {
     return ptr.toInt() // TODO: LP64 unsafe.
 }
 
+@Used
 @ExportForCppRuntime("Konan_js_runLambda")
 fun runLambda(pointer: Int, argumentsArena: Arena, argumentsArenaSize: Int): Int {
     val arguments = arrayListOf<JsValue>()
@@ -75,15 +87,19 @@ open class JsArray(arena: Arena, index: Object): JsValue(arena, index) {
         get() = this.getInt("length")
 }
 
+@Used
 @SymbolName("Konan_js_getInt")
 external public fun getInt(arena: Arena, obj: Object, propertyPtr: Pointer, propertyLen: Int): Int;
 
+@Used
 @SymbolName("Konan_js_getProperty")
 external public fun Konan_js_getProperty(arena: Arena, obj: Object, propertyPtr: Pointer, propertyLen: Int): Int;
 
+@Used
 @SymbolName("Konan_js_setFunction")
 external public fun setFunction(arena: Arena, obj: Object, propertyName: Pointer, propertyLength: Int , function: Int)
 
+@Used
 @SymbolName("Konan_js_setString")
 external public fun setString(arena: Arena, obj: Object, propertyName: Pointer, propertyLength: Int, stringPtr: Pointer, stringLength: Int )
 

runtime/src/main/cpp/Runtime.h

@@ -17,6 +17,8 @@
 #ifndef RUNTIME_RUNTIME_H
 #define RUNTIME_RUNTIME_H
 
+#include "Porting.h"
+
 struct RuntimeState;
 struct InitNode;
 
@@ -24,8 +26,8 @@ struct InitNode;
 extern "C" {
 #endif
 
-void Kotlin_initRuntimeIfNeeded();
-void Kotlin_deinitRuntimeIfNeeded();
+void RUNTIME_USED Kotlin_initRuntimeIfNeeded();
+void RUNTIME_USED Kotlin_deinitRuntimeIfNeeded();
 
 // Appends given node to an initializer list.
 void AppendToInitializersTail(struct InitNode*);