npe() runtime intrinsic method.

stdlib/src/jet/runtime/Intrinsics.java

@@ -10,4 +10,14 @@ public class Intrinsics {
     public static String stringPlus(String self, Object other) {
         return ((self == null) ? "null" : self) + ((other == null) ? "null" : other.toString());
     }
+
+    public static Object npe(Object self) {
+        if(self == null)
+            return throwNpe();
+        return self;
+    }
+
+    private static Object throwNpe() {
+        throw new JetNullPointerException();
+    }
 }

stdlib/src/jet/runtime/JetNullPointerException.java

@@ -0,0 +1,32 @@
+package jet.runtime;
+
+import java.util.ArrayList;
+
+/**
+* @author alex.tkachman
+*/
+class JetNullPointerException extends NullPointerException {
+    @Override
+    public synchronized Throwable fillInStackTrace() {
+        super.fillInStackTrace();
+        StackTraceElement[] stackTrace = getStackTrace();
+        ArrayList<StackTraceElement> list = new ArrayList<StackTraceElement>();
+        boolean skip = true;
+        for(StackTraceElement ste : stackTrace) {
+            if(!skip) {
+                list.add(ste);
+            }
+            else {
+                if("jet.runtime.Intrinsics".equals(ste.getClassName()) && "npe".equals(ste.getMethodName())) {
+                    skip = false;
+                }
+            }
+        }
+        setStackTrace(list.toArray(new StackTraceElement[list.size()]));
+        return this;
+    }
+
+    public static void main(String[] args) {
+        Intrinsics.npe(null);
+    }
+}