int sym_table_destroy(struct sym_table * s);
int sym_table_check(struct sym_table * s);
int sym_table_add(struct sym_table * * s,char * symbol,int value);
int sym_table_unresolved_new(struct sym_table * * s,char * symbol,struct cardiac_code * c);
int sym_table_unresolved_add(struct sym_table * s,struct cardiac_code *c);
int sym_table_search(struct sym_table * * s,char * symbol);
int bkpatch(struct sym_table * s);
int code_out(struct cardiac_code * code_ptr);
int code_destroy(struct cardiac_code * code_ptr);