question: @ SuppressWarnings ( "unchecked" ) private static void handleMethodNode ( GetStaticGraph staticUsageTree , ClassNode cn , MethodNode mn , int depth ) { InsnList instructions = mn . instructions ; Iterator < AbstractInsnNode > iterator = instructions . iterator ( ) ; while ( iterator . hasNext ( ) ) { AbstractInsnNode insn = iterator . next ( ) ; if ( insn instanceof MethodInsnNode ) { handleMethodInsnNode ( staticUsageTree , cn , mn , ( MethodInsnNode ) insn , depth + 1 ) ; } else if ( insn instanceof FieldInsnNode ) { handleFieldInsnNode ( staticUsageTree , cn , mn , ( FieldInsnNode ) insn , depth + 1 ) ; } } }
target:  Add all possible calls for a given method