Support for throwing exceptions from Eval

src/org/jetbrains/eval4j/interpreterLoop.kt

@@ -24,6 +24,8 @@ trait InterpretationEventHandler {
     fun exceptionCaught(currentState: Frame<Value>, currentInsn: AbstractInsnNode, exception: Value): InterpreterResult?
 }
 
+class ThrownFromEvalException(val exception: Value): RuntimeException()
+
 fun interpreterLoop(
         ownerClassInternalName: String,
         m: MethodNode,
@@ -41,12 +43,10 @@ fun interpreterLoop(
     }
 
     val interpreter = SingleInstructionInterpreter(eval)
-    try {
         var frame = initFrame(ownerClassInternalName, m, interpreter)
 
     while (true) {
         // TODO try-catch-finally support
-            // TODO support exceptions thrown by eval
 
         val insnOpcode = currentInsn.getOpcode()
         val insnType = currentInsn.getType()
@@ -95,17 +95,19 @@ fun interpreterLoop(
             }
         }
 
+        try {
             frame.execute(currentInsn, interpreter)
+        }
+        catch (e: ThrownFromEvalException) {
+            // TODO: try/catch.finaly
+            return ExceptionThrown(e.exception)
+        }
 
         val handled = instructionHandler(currentInsn)
         if (handled != null) return handled
 
         goto(currentInsn.getNext())
     }
-    }
-    catch (e: Throwable) {
-        throw e
-    }
 }
 
 // Copied from org.objectweb.asm.tree.analysis.Analyzer.analyze()