asg/var.h

   1 /************************************************************
   2 **
   3 **       COPYRIGHT (C) 1993 UNIVERSITY OF PITTSBURGH
   4 **       COPYRIGHT (C) 1996 GANNON UNIVERSITY
   5 **                  ALL RIGHTS RESERVED
   6 **
   7 **        This software is distributed on an as-is basis
   8 **        with no warranty implied or intended.  No author
   9 **        or distributor takes responsibility to anyone
  10 **        regarding its use of or suitability.
  11 **
  12 **        The software may be distributed and modified
  13 **        freely for academic and other non-commercial
  14 **        use but may NOT be utilized or included in whole
  15 **        or part within any commercial product.
  16 **
  17 **        This copyright notice must remain on all copies
  18 **        and modified versions of this software.
  19 **
  20 ************************************************************/
  21 /*
  22  *      file var.h
  23  * As part of MS Thesis Work, S T Frezza, UPitt Engineering
  24  * June, 1990
  25  *
  26  */
  27
  28 typedef union  var_item_union   varItem;
  29 typedef struct var_item_struct  varStruct;
  30 typedef struct var_struct       var;
  31 typedef struct var_list_struct  varlist;
  32
  33 /* ---------- Srange structures lifted from "route.h" ---------------------------- */
  34 typedef struct short_range_struct       srange;
  35 typedef struct short_range_list_struct  srnglist;
  36
  37 struct short_range_struct
  38 {
  39     int q1, q2, orient;
  40 };
  41
  42 struct short_range_list_struct
  43 {
  44     srange *this;
  45     srnglist *next;
  46 };
  47
  48
  49 /* --------------------- var type definition and supports -------------------------*/
  50
  51 /* Used to identify the action associated with the var*/
  52 #define MULTIPLY  1
  53 #define DIVIDE   2
  54 #define ADD      3
  55 #define SUBTRACT 4
  56
  57 #define VAR 1
  58 #define INT 2
  59 #define RNG 3
  60
  61 #define X 1     /* The orientation of a given edge */
  62 #define Y 2
  63
  64 #define XFUZZ 4
  65 #define YFUZZ 4
  66
  67 struct var_struct
  68 /* structure to assemble strings of ranges;  Each of these is meant to collapse into a
  69  * single point (integer).  In lisp, the structure is like an unevaluated list:
  70 * '(function item1 item2), which is waiting for evaluation.        */
  71 {
  72     int         action;
  73     varStruct   *item1;
  74     varStruct   *item2;
  75 };
  76
  77 struct var_item_struct
  78 /* This is a structure to contain the union of *int, *srange, and *varItem (s)
  79  * and a code of what the union actually contains. */
  80 {
  81     varItem   *this;
  82     int       type;
  83 };
  84
  85
  86 union var_union_type
  87 /* This is a union of *int, *srange, and *varItems: */
  88 {
  89     int     *i;
  90     srange  *r;
  91     var     *v;
  92 };
  93
  94
  95 struct var_struct_list
  96 {
  97     var       *this;
  98     varlist   *next;
  99 };
 100
 101
 102 /*---------------------------------------------------------------
 103  * Defined in var.c
 104  *---------------------------------------------------------------
 105  */
 106 extern int eval_var();
 107 /*      var *v          */
 108
 109 extern var *reduce_var();
 110 /*      var *v          */
 111
 112 extern varStruct *eval_action();
 113 /*     int a                     */
 114 /*     varStruct *i1, *i2        */
 115
 116 extern varStruct *create_rng_varStruct();
 117 /*     srange *sr                */
 118
 119 extern varStruct *create_var_varStruct();
 120 /*     var *v                    */
 121
 122 extern varStruct *create_int_varStruct();
 123 /*     int *i                    */
 124
 125 extern var *create_var_struct();
 126 /*     int a                     */
 127 /*     varStruct *i1, *i2        */
 128
 129 extern srange *create_srange();
 130 /*     int q1, q2, or */