bool remove_function_pointerst::is_type_compatible(
const code_typet &call_type,
const code_typet &function_type)
{
// we are willing to ignore anything that's returned
// if we call with 'void'
if(type_eq(call_type.return_type(), empty_typet(), ns))
{
// ok
}
else
{
if(!arg_is_type_compatible(call_type.return_type(),
function_type.return_type()))
return false;
}
// let's look at the arguments
const code_typet::argumentst &call_arguments=call_type.arguments();
const code_typet::argumentst &function_arguments=function_type.arguments();
if(function_type.has_ellipsis() &&
function_arguments.empty())
{
// always ok
}
else if(call_type.has_ellipsis() &&
call_arguments.empty())
{
// always ok
}
else
{
// we are quite strict here, could be much more generous
if(call_arguments.size()!=function_arguments.size())
return false;
for(unsigned i=0; i<call_arguments.size(); i++)
if(!arg_is_type_compatible(call_arguments[i].type(),
function_arguments[i].type()))
return false;
}
return true;
}
void cpp_typecheckt::convert_arguments(
const irep_idt &mode,
code_typet &function_type)
{
code_typet::argumentst &arguments=
function_type.arguments();
for(code_typet::argumentst::iterator
it=arguments.begin();
it!=arguments.end();
it++)
convert_argument(mode, *it);
}
void goto_inlinet::parameter_assignments(
const locationt &location,
const code_typet &code_type,
const exprt::operandst &arguments,
goto_programt &dest)
{
// iterates over the operands
exprt::operandst::const_iterator it1=arguments.begin();
goto_programt::local_variablest local_variables;
const code_typet::argumentst &argument_types=
code_type.arguments();
// iterates over the types of the arguments
for(code_typet::argumentst::const_iterator
it2=argument_types.begin();
it2!=argument_types.end();
it2++)
{
// if you run out of actual arguments there was a mismatch
if(it1==arguments.end())
{
err_location(location);
throw "function call: not enough arguments";
}
const exprt &argument=static_cast<const exprt &>(*it2);
// this is the type the n-th argument should be
const typet &arg_type=ns.follow(argument.type());
const irep_idt &identifier=argument.cmt_identifier();
if(identifier=="")
{
err_location(location);
throw "no identifier for function argument";
}
{
const symbolt &symbol=ns.lookup(identifier);
goto_programt::targett decl=dest.add_instruction();
decl->make_other();
exprt tmp = code_declt(symbol_expr(symbol));
migrate_expr(tmp, decl->code);
decl->location=location;
decl->function=location.get_function();
decl->local_variables=local_variables;
}
local_variables.insert(identifier);
// nil means "don't assign"
if(it1->is_nil())
{
}
else
{
// this is the actual parameter
exprt actual(*it1);
// it should be the same exact type
type2tc arg_type_2, actual_type_2;
migrate_type(arg_type, arg_type_2);
migrate_type(actual.type(), actual_type_2);
if (!base_type_eq(arg_type_2, actual_type_2, ns))
{
const typet &f_argtype = ns.follow(arg_type);
const typet &f_acttype = ns.follow(actual.type());
// we are willing to do some conversion
if((f_argtype.id()=="pointer" &&
f_acttype.id()=="pointer") ||
(f_argtype.is_array() &&
f_acttype.id()=="pointer" &&
f_argtype.subtype()==f_acttype.subtype()))
{
actual.make_typecast(arg_type);
}
else if((f_argtype.id()=="signedbv" ||
f_argtype.id()=="unsignedbv" ||
f_argtype.is_bool()) &&
(f_acttype.id()=="signedbv" ||
f_acttype.id()=="unsignedbv" ||
f_acttype.is_bool()))
{
actual.make_typecast(arg_type);
}
else
{
err_location(location);
str << "function call: argument `" << identifier
<< "' type mismatch: got "
<< from_type(ns, identifier, it1->type())
<< ", expected "
<< from_type(ns, identifier, arg_type);
throw 0;
}
}
// adds an assignment of the actual parameter to the formal parameter
code_assignt assignment(symbol_exprt(identifier, arg_type), actual);
assignment.location()=location;
dest.add_instruction(ASSIGN);
dest.instructions.back().location=location;
migrate_expr(assignment, dest.instructions.back().code);
dest.instructions.back().local_variables=local_variables;
dest.instructions.back().function=location.get_function();
}
it1++;
}
if(it1!=arguments.end())
{
// too many arguments -- we just ignore that, no harm done
}
}
bool cpp_typecheck_fargst::match(
const code_typet &code_type,
unsigned &distance,
cpp_typecheckt &cpp_typecheck) const
{
distance=0;
exprt::operandst ops = operands;
const code_typet::argumentst &arguments=code_type.arguments();
if(arguments.size()>ops.size())
{
// Check for default values.
ops.reserve(arguments.size());
for(unsigned i=ops.size(); i<arguments.size(); i++)
{
const exprt &default_value=
arguments[i].default_value();
if(default_value.is_nil())
return false;
ops.push_back(default_value);
}
}
else if(arguments.size()<ops.size())
{
// check for ellipsis
if(!code_type.has_ellipsis())
return false;
}
for(unsigned i=0; i<ops.size(); i++)
{
// read
// http://publib.boulder.ibm.com/infocenter/comphelp/v8v101/topic/com.ibm.xlcpp8a.doc/language/ref/implicit_conversion_sequences.htm
//
// The following are the three categories of conversion sequences in order from best to worst:
// * Standard conversion sequences
// * User-defined conversion sequences
// * Ellipsis conversion sequences
if(i>=arguments.size())
{
// Ellipsis is the 'worst' of the conversion sequences
distance+=1000;
continue;
}
exprt argument=arguments[i];
exprt &operand=ops[i];
#if 0
// unclear, todo
if(is_reference(operand.type()))
std::cout << "O: " << operand.pretty() << std::endl;
assert(!is_reference(operand.type()));
#endif
// "this" is a special case -- we turn the pointer type
// into a reference type to do the type matching
if(i==0 && argument.get("#base_name")==ID_this)
{
argument.type().set("#reference", true);
argument.type().set("#this", true);
}
unsigned rank = 0;
exprt new_expr;
#if 0
std::cout << "C: " << cpp_typecheck.to_string(operand.type())
<< " -> " << cpp_typecheck.to_string(argument.type()) << std::endl;
#endif
// can we do the standard conversion sequence?
if(cpp_typecheck.implicit_conversion_sequence(
operand, argument.type(), new_expr, rank))
{
// ok
distance+=rank;
#if 0
std::cout << "OK " << rank << std::endl;
#endif
}
else
{
#if 0
std::cout << "NOT OK" << std::endl;
#endif
return false; // no conversion possible
}
}
return true;
}