#ifndef cg_dfn_h#define cg_dfn_h/* * Flags which mark a symbol as topologically ``busy'' or as * topologically ``not_numbered'': */#define DFN_BUSY -1#define DFN_NAN 0/* * Depth-first numbering of a call-graph. */externvoid cg_dfn PARAMS((Sym * root));#endif/* cg_dfn_h */