1: /*	ndu.h	4.1	85/03/19	*/
   2: 
   3: /*
   4:  * This file defines the basic tree node data structure for the PCC.
   5:  */
   6: 
   7: union ndu {
   8:     struct {        /* interior node */
   9:         int op;
  10:         int rall;
  11:         TWORD   type;
  12:         int su;
  13: #ifndef FLEXNAMES
  14:         char    name[NCHNAM];
  15: #else
  16:         char    *name;
  17:         int stalign;
  18: #endif
  19:         NODE    *left;
  20:         NODE    *right;
  21:     } in;
  22:     struct {        /* terminal node */
  23:         int op;
  24:         int rall;
  25:         TWORD   type;
  26:         int su;
  27: #ifndef FLEXNAMES
  28:         char    name[NCHNAM];
  29: #else
  30:         char    *name;
  31:         int stalign;
  32: #endif
  33:         CONSZ   lval;
  34:         int rval;
  35:     } tn;
  36:     struct {        /* branch node */
  37:         int op;
  38:         int rall;
  39:         TWORD   type;
  40:         int su;
  41:         int label;      /* for use with branching */
  42:     } bn;
  43:     struct {        /* structure node */
  44:         int op;
  45:         int rall;
  46:         TWORD   type;
  47:         int su;
  48:         int stsize;     /* sizes of structure objects */
  49:         int stalign;    /* alignment of structure objects */
  50:     } stn;
  51:     struct {        /* front node */
  52:         int op;
  53:         int cdim;
  54:         TWORD   type;
  55:         int csiz;
  56:     } fn;
  57:     /*
  58: 	 * This structure is used when a double precision
  59: 	 * floating point constant is being computed
  60: 	 */
  61:     struct {            /* DCON node */
  62:         int op;
  63:         TWORD   type;
  64:         int cdim;
  65:         int csiz;
  66:         double  dval;
  67:     } dpn;
  68:     /*
  69: 	 * This structure is used when a single precision
  70: 	 * floating point constant is being computed
  71: 	 */
  72:     struct {            /* FCON node */
  73:         int op;
  74:         TWORD   type;
  75:         int cdim;
  76:         int csiz;
  77:         float   fval;
  78:     } fpn;
  79: };

Defined union's

ndu defined in line 7; used 2 times

Usage of this include

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