predicate.cc

   1 #include "predicate.h"
   2
   3 Predicate::Predicate(FuncInst * func_inst, bool is_entry) :
   4         func_inst(func_inst),
   5         entry_predicate(is_entry),
   6         does_write(false),
   7         pred_expressions(16),
   8         children(),
   9         parent(NULL),
  10         backedges(16)
  11 {}
  12
  13 Predicate::~Predicate()
  14 {
  15         // parent and func_inst should not be deleted
  16         pred_expressions.reset();
  17         backedges.reset();
  18         children.clear();
  19 }
  20
  21 unsigned int pred_expr_hash(struct pred_expr * expr)
  22 {
  23         return (unsigned int)((uintptr_t)expr);
  24 }
  25
  26 bool pred_expr_equal(struct pred_expr * p1, struct pred_expr * p2)
  27 {
  28         if (p1->token != p2->token)
  29                 return false;
  30         if (p1->token == EQUALITY && p1->func_inst != p2->func_inst)
  31                 return false;
  32         if (p1->value != p2->value)
  33                 return false;
  34         return true;
  35 }
  36
  37 void Predicate::add_predicate_expr(token_t token, FuncInst * func_inst, bool value)
  38 {
  39         struct pred_expr *ptr = new pred_expr(token, func_inst, value);
  40         pred_expressions.add(ptr);
  41 }
  42
  43 void Predicate::add_child(Predicate * child)
  44 {
  45         /* check duplication? */
  46         children.push_back(child);
  47 }
  48
  49 void Predicate::copy_predicate_expr(Predicate * other)
  50 {
  51         PredExprSet * other_pred_expressions = other->get_pred_expressions();
  52         PredExprSetIter * it = other_pred_expressions->iterator();
  53
  54         while (it->hasNext()) {
  55                 struct pred_expr * ptr = it->next();
  56                 struct pred_expr * copy = new pred_expr(ptr->token, ptr->func_inst, ptr->value);
  57                 pred_expressions.add(copy);
  58         }
  59 }
  60
  61 /* Evaluate predicate expressions against the given inst_act_map */
  62 SnapVector<struct concrete_pred_expr> Predicate::evaluate(inst_act_map_t * inst_act_map)
  63 {
  64         SnapVector<struct concrete_pred_expr> concrete_exprs;
  65         PredExprSetIter * it = pred_expressions.iterator();
  66
  67         while (it->hasNext()) {
  68                 struct pred_expr * ptr = it->next();
  69                 uint64_t value = 0;
  70
  71                 switch(ptr->token) {
  72                         case NOPREDICATE:
  73                                 break;
  74                         case EQUALITY:
  75                                 FuncInst * to_be_compared;
  76                                 ModelAction * last_act;
  77
  78                                 to_be_compared = ptr->func_inst;
  79                                 last_act = inst_act_map->get(to_be_compared);
  80                                 value = last_act->get_reads_from_value();
  81                                 break;
  82                         case NULLITY:
  83                                 break;
  84                         default:
  85                                 break;
  86                 }
  87
  88                 concrete_exprs.push_back(concrete_pred_expr(ptr->token, value, ptr->value));
  89         }
  90
  91         return concrete_exprs;
  92 }
  93
  94 void Predicate::print_predicate()
  95 {
  96         model_print("\"%p\" [shape=box, label=\"\n", this);
  97         if (entry_predicate) {
  98                 model_print("entry node\"];\n");
  99                 return;
 100         }
 101
 102         func_inst->print();
 103
 104         PredExprSetIter * it = pred_expressions.iterator();
 105
 106         if (pred_expressions.getSize() == 0)
 107                 model_print("predicate unset\n");
 108
 109         while (it->hasNext()) {
 110                 struct pred_expr * expr = it->next();
 111                 FuncInst * inst = expr->func_inst;
 112                 switch (expr->token) {
 113                         case NOPREDICATE:
 114                                 break;
 115                         case EQUALITY:
 116                                 model_print("predicate token: equality, position: %s, value: %d\n", inst->get_position(), expr->value);
 117                                 break;
 118                         case NULLITY:
 119                                 model_print("predicate token: nullity, value: %d\n", expr->value);
 120                                 break;
 121                         default:
 122                                 model_print("unknown predicate token\n");
 123                                 break;
 124                 }
 125         }
 126
 127         if (does_write) {
 128                 model_print("Does write\n");
 129         }
 130         model_print("\"];\n");
 131 }
 132
 133 void Predicate::print_pred_subtree()
 134 {
 135         print_predicate();
 136         for (uint i = 0; i < children.size(); i++) {
 137                 Predicate * child = children[i];
 138                 child->print_pred_subtree();
 139                 model_print("\"%p\" -> \"%p\"\n", this, child);
 140         }
 141
 142         PredSetIter * it = backedges.iterator();
 143         while (it->hasNext()) {
 144                 Predicate * backedge = it->next();
 145                 model_print("\"%p\" -> \"%p\"[style=dashed, color=grey]\n", this, backedge);
 146         }
 147 }