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();
}
}
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);
}