code: private void processCollectionStore() {
          String fieldClassName = getDottedClassConstantOperand();
          if (fieldClassName.equals(className) && (stack.getStackDepth() > 0)) {
              OpcodeStack.Item item = stack.getStackItem(0);
              if (item.getUserValue() != null) {
                  String fieldName = getNameConstantOperand();
                  if (fieldName != null) {
                      FieldInfo fi = collectionFields.get(fieldName);
                      if (fi != null) {
                          fi.getFieldAnnotation().setSourceLines(SourceLineAnnotation.fromVisitedInstruction(this));
                          fi.setSynchronized();
                      }
                  }
              }
          }
      }
docs: sets the source line annotation of a store to a collection if that collection is synchronized.