4.3BSD - /usr/src/usr.bin/struct/3.flow.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)3.flow.c	4.1	(Berkeley)	2/11/83";
   3: #endif not lint
   4: 
   5: #include <stdio.h>
   6: #
   7: /*
   8: correct the flow of control in the new program - use GOTO's which may
   9: be changed later to NEXT, BREAK, etc.
  10: */
  11: #include "def.h"
  12: #include "3.def.h"
  13: 
  14: #define BRANCHTYPE(v)   (NTYPE(v) == GOVX )
  15: #define HASLEX(t)   (t != GOVX && t != COMPVX && t != ASGOVX  && t != ITERVX )
  16:             /* for these, control never flows directly to following statement */
  17: 
  18: 
  19: getflow()
  20:     {
  21:     fixflow(START,UNDEFINED);
  22:     }
  23: 
  24: 
  25: fixflow(v,autolex)
  26: VERT v;
  27: VERT autolex;       /* lexical successor of v */
  28:     {
  29:     VERT lex,chlex,z,x,w;
  30:     int i;
  31:     lex = lexval(v,autolex);
  32:     if (HASLEX(NTYPE(v)) && NTYPE(v) != ICASVX)
  33:         if (DEFINED(REACH(v)) && REACH(v) != lex)
  34:             insib(v,makebr(REACH(v)));
  35:         else if (NTYPE(v) == DOVX && ARC(v,1) != lex)
  36:             insib(v,makebr(ARC(v,1)));
  37:     if (NTYPE(v) == ITERVX)
  38:         {
  39:         BRK(v) = autolex;
  40:         chlex = v;
  41:         }
  42:     else
  43:         chlex = lexval(v,autolex);
  44: 
  45:     for (i = 0; i < CHILDNUM(v); ++i)
  46:         {
  47:         w = LCHILD(v,i);
  48:         if (DEFINED(w))
  49:             fixflow(w,chlex);
  50:         else
  51:             {
  52:             ASSERT(i < ARCNUM(v),fixflow);
  53:             z = ARC(v,i);
  54:             ASSERT(DEFINED(z), fixflow);
  55:             if (z != chlex)
  56:                 {
  57:                 x = makebr(z);
  58:                 LCHILD(v,i) = x;
  59:                 RSIB(x) = UNDEFINED;
  60:                 }
  61:             }
  62:         }
  63:     if (DEFINED(RSIB(v)))
  64:         fixflow(RSIB(v),autolex);
  65:     }
  66: 
  67: 
  68: lexval(v,lastlex)
  69: VERT v,lastlex;
  70:     {
  71:     VERT sib;
  72:     if (!HASLEX(NTYPE(v))) return(UNDEFINED);
  73:     sib = RSIB(v);
  74:     if (NTYPE(v) == ICASVX || NTYPE(v) == ACASVX)
  75:         return(lastlex);
  76:     else if (!DEFINED(sib))
  77:         return(lastlex);
  78:     else if (BRANCHTYPE(sib))
  79:         return(ARC(sib,0));
  80:     else return(sib);
  81:     }
  82: 
  83: 
  84: makebr(w)       /* make branching node leading to w */
  85: VERT w;
  86:     {
  87:     VERT new;
  88:     new = create(GOVX,1);
  89:     ARC(new,0) = w;
  90:     RSIB(new) = UNDEFINED;
  91:     REACH(new) = UNDEFINED;
  92:     return(new);
  93:     }

Defined functions

Defined variables

Defined macros