Add getSourceLocation message to PException

Author: msimacek

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/exception/PException.java

@@ -66,6 +66,7 @@
 import com.oracle.truffle.api.library.ExportLibrary;
 import com.oracle.truffle.api.library.ExportMessage;
 import com.oracle.truffle.api.nodes.Node;
+import com.oracle.truffle.api.source.SourceSection;
 
 /**
  * Serves both as a throwable carrier of the python exception object and as a represenation of the
@@ -351,5 +352,19 @@ RuntimeException throwException() {
         throw getExceptionForReraise();
     }
 
+    @ExportMessage
+    @SuppressWarnings("static-method")
+    boolean hasSourceLocation() {
+        return getLocation() != null;
+    }
+
+    @ExportMessage(name = "getSourceLocation")
+    SourceSection getExceptionSourceLocation() throws UnsupportedMessageException {
+        if (hasSourceLocation()) {
+            return getLocation().getEncapsulatingSourceSection();
+        }
+        throw UnsupportedMessageException.create();
+    }
+
     // Note: remaining interop messages are forwarded to the contained PBaseException
 }