From 79b0dc5652e6657ac51b4fe6b1e994d787eee48d Mon Sep 17 00:00:00 2001
From: Svyatoslav Scherbina <svyatoslav.scherbina@jetbrains.com>
Date: Wed, 7 Mar 2018 17:17:25 +0300
Subject: [PATCH] Add check to prevent loading more than one Kotlin framework

---
 runtime/src/main/cpp/ObjCExport.mm | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/runtime/src/main/cpp/ObjCExport.mm b/runtime/src/main/cpp/ObjCExport.mm
index 7887b79fd4e..1073a78492e 100644
--- a/runtime/src/main/cpp/ObjCExport.mm
+++ b/runtime/src/main/cpp/ObjCExport.mm
@@ -897,4 +897,15 @@ extern "C" void Kotlin_ObjCExport_AbstractMethodCalled(id self, SEL selector) {
         class_getName(object_getClass(self)), sel_getName(selector)];
 }
 
+__attribute__((constructor))
+static void checkLoadedOnce() {
+  Class marker = objc_allocateClassPair([NSObject class], "KotlinFrameworkLoadedOnceMarker", 0);
+  if (marker == nullptr) {
+    [NSException raise:NSGenericException
+          format:@"Only one Kotlin framework can be loaded currently"];
+  } else {
+    objc_registerClassPair(marker);
+  }
+}
+
 #endif // KONAN_OBJC_INTEROP