1: # include   <ingres.h>
   2: # include   <aux.h>
   3: # include   <tree.h>
   4: # include   <symbol.h>
   5: # include   <sccs.h>
   6: 
   7: SCCSID(@(#)mapvar.c	8.1	12/31/84)
   8: 
   9: /*
  10: **	MAPVAR -- construct variable maps for ROOT, AND, and AGHEAD nodes.
  11: **	tl is a flag  which indicates if the target list should
  12: **	be included in the mapping.  If tl = 0, it should; else it should not.
  13: **
  14: **	Trace Flags:
  15: **		52
  16: */
  17: 
  18: mapvar(t, tl)
  19: register QTREE  *t;
  20: int     tl;
  21: {
  22:     register int    rmap, lmap;
  23:     extern QTREE    *ckvar();
  24: 
  25:     if (t == NULL)
  26:         return (NULL);
  27: 
  28: # ifdef xDTR3
  29:     if (tTf(52, 0))
  30:         printf("mapvar(%x) %c\n", t, t->sym.type);
  31: # endif xDTR3
  32: 
  33:     switch (t->sym.type)
  34:     {
  35:       case ROOT:
  36:       case AND:
  37:       case AGHEAD:
  38:         /* map the right side */
  39:         t->sym.value.sym_root.rvarm = rmap = mapvar(t->right, tl);
  40: 
  41:         /* map the left side or else use existing values */
  42:         if (tl == 0)
  43:         {
  44:             t->sym.value.sym_root.lvarm = lmap = mapvar(t->left, tl);
  45:             t->sym.value.sym_root.lvarc = bitcnt(lmap);
  46:         }
  47:         else
  48:             lmap = t->sym.value.sym_root.lvarm;
  49: 
  50:         /* form map of both sides */
  51:         rmap |= lmap;
  52: 
  53:         /* compute total var count */
  54:         t->sym.value.sym_root.tvarc = bitcnt(rmap);
  55: 
  56:         return (rmap);
  57: 
  58:       case VAR:
  59:         if ((t = ckvar(t))->sym.value.sym_var.valptr)
  60:             return (NULL);  /* var is a constant */
  61:         return (01 << t->sym.value.sym_var.varno);
  62:     }
  63: 
  64:     /* node is not a VAR, AND, ROOT, or AGHEAD */
  65:     return (mapvar(t->left, tl) | mapvar(t->right, tl));
  66: }
Last modified: 1986-04-17
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