private static void addTracer(
     StructClass cls, StructMethod method, BytecodeMappingTracer tracer) {
   StructLineNumberTableAttribute lineNumberTable =
       (StructLineNumberTableAttribute)
           method.getAttributes().getWithKey(StructGeneralAttribute.ATTRIBUTE_LINE_NUMBER_TABLE);
   tracer.setLineNumberTable(lineNumberTable);
   DecompilerContext.getBytecodeSourceMapper()
       .addTracer(
           cls.qualifiedName,
           InterpreterUtil.makeUniqueKey(method.getName(), method.getDescriptor()),
           tracer);
 }