Example #1
0
void goto_convertt::convert_CPROVER_throw(
  const codet &code,
  goto_programt &dest)
{
  // set the 'exception' flag
  {
    goto_programt::targett t_set_exception=
      dest.add_instruction(ASSIGN);

    t_set_exception->source_location=code.source_location();
    t_set_exception->code=code_assignt(exception_flag(), true_exprt());
  }

  // do we catch locally?
  if(targets.throw_set)
  {
    // need to process destructor stack
    unwind_destructor_stack(code.source_location(), targets.throw_stack_size, dest);

    // add goto
    goto_programt::targett t=dest.add_instruction();
    t->make_goto(targets.throw_target);
    t->source_location=code.source_location();
  }
  else // otherwise, we do a return
  {
    // need to process destructor stack
    unwind_destructor_stack(code.source_location(), 0, dest);

    // add goto
    goto_programt::targett t=dest.add_instruction();
    t->make_goto(targets.return_target);
    t->source_location=code.source_location();
  }
}
Example #2
0
void goto_convertt::convert_CPROVER_try_catch(
  const codet &code,
  goto_programt &dest)
{
  if(code.operands().size()!=2)
  {
    err_location(code);
    throw "CPROVER_try_catch expects two arguments";
  }

  // this is where we go after 'throw'
  goto_programt tmp;
  tmp.add_instruction(SKIP)->source_location=code.source_location();

  // set 'throw' target
  throw_targett throw_target(targets);
  targets.set_throw(tmp.instructions.begin());
  
  // now put 'catch' code onto destructor stack
  code_ifthenelset catch_code;
  catch_code.cond()=exception_flag();
  catch_code.add_source_location()=code.source_location();
  catch_code.then_case()=to_code(code.op1());

  targets.destructor_stack.push_back(catch_code);

  // now convert 'try' code
  convert(to_code(code.op0()), dest);

  // pop 'catch' code off stack
  targets.destructor_stack.pop_back();
  
  // add 'throw' target
  dest.destructive_append(tmp);
}