cover_util.cpp

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/*******************************************************************\
 
Module: Coverage Instrumentation
 
Author: Daniel Kroening
 
\*******************************************************************/

 
#include "cover_util.h"
 
bool is_condition(const exprt &src)
{
  if(!src.is_boolean())
    return false;
 
  // conditions are 'atomic predicates'
  if(
    src.id() == ID_and || src.id() == ID_or || src.id() == ID_not ||
    src.id() == ID_implies)
    return false;
 
  return true;
}
 
void collect_conditions_rec(const exprt &src, std::set<exprt> &dest)
{
  if(src.id() == ID_address_of)
  {
    return;
  }
 
  for(const auto &op : src.operands())
    collect_conditions_rec(op, dest);
 
  if(is_condition(src) && !src.is_constant())
    dest.insert(src);
}
 
std::set<exprt> collect_conditions(const exprt &src)
{
  std::set<exprt> result;
  collect_conditions_rec(src, result);
  return result;
}
 
std::set<exprt> collect_conditions(const goto_programt::const_targett t)
{
  std::set<exprt> result;
 
  t->apply([&result](const exprt &e) { collect_conditions_rec(e, result); });
 
  return result;
}
 
void collect_operands(const exprt &src, std::vector<exprt> &dest)
{
  for(const exprt &op : src.operands())
  {
    if(op.id() == src.id())
      collect_operands(op, dest);
    else
      dest.push_back(op);
  }
}
 
void collect_decisions_rec(const exprt &src, std::set<exprt> &dest)
{
  if(src.id() == ID_address_of)
  {
    return;
  }
 
  if(src.is_boolean())
  {
    if(src.is_constant())
    {
      // ignore me
    }
    else if(src.id() == ID_not)
    {
      collect_decisions_rec(to_not_expr(src).op(), dest);
    }
    else
    {
      dest.insert(src);
    }
  }
  else
  {
    for(const auto &op : src.operands())
      collect_decisions_rec(op, dest);
  }
}
 
std::set<exprt> collect_decisions(const goto_programt::const_targett t)
{
  std::set<exprt> result;
 
  t->apply([&result](const exprt &e) { collect_decisions_rec(e, result); });
 
  return result;
}