void c_typecheck_baset::typecheck_vector_type(vector_typet &type)
{
exprt &size=type.size();
source_locationt source_location=size.find_source_location();
typecheck_expr(size);
typet &subtype=type.subtype();
typecheck_type(subtype);
// we are willing to combine 'vector' with various
// other types, but not everything!
if(subtype.id()!=ID_signedbv &&
subtype.id()!=ID_unsignedbv &&
subtype.id()!=ID_floatbv &&
subtype.id()!=ID_fixedbv)
{
error().source_location=source_location;
error() << "cannot make a vector of subtype "
<< to_string(subtype) << eom;
throw 0;
}
make_constant_index(size);
mp_integer s;
if(to_integer(size, s))
{
error().source_location=source_location;
error() << "failed to convert constant: "
<< size.pretty() << eom;
throw 0;
}
if(s<=0)
{
error().source_location=source_location;
error() << "vector size must be positive, "
"but got " << s << eom;
throw 0;
}
// the subtype must have constant size
exprt size_expr=c_sizeof(type.subtype(), *this);
simplify(size_expr, *this);
mp_integer sub_size;
if(to_integer(size_expr, sub_size))
{
error().source_location=source_location;
error() << "failed to determine size of vector base type `"
<< to_string(type.subtype()) << "'" << eom;
throw 0;
}
if(sub_size==0)
{
error().source_location=source_location;
error() << "type had size 0: `"
<< to_string(type.subtype()) << "'" << eom;
throw 0;
}
// adjust by width of base type
if(s%sub_size!=0)
{
error().source_location=source_location;
error() << "vector size (" << s
<< ") expected to be multiple of base type size (" << sub_size
<< ")" << eom;
throw 0;
}
s/=sub_size;
type.size()=from_integer(s, signed_size_type());
}
typet index_type()
{
// same as signed size type
return signed_size_type();
}
void c_typecheck_baset::typecheck_type(typet &type)
{
// we first convert, and then check
{
ansi_c_convert_typet ansi_c_convert_type(get_message_handler());
ansi_c_convert_type.read(type);
ansi_c_convert_type.write(type);
}
if(type.id()==ID_already_typechecked)
{
// need to preserve any qualifiers
c_qualifierst c_qualifiers(type);
c_qualifiers+=c_qualifierst(type.subtype());
bool packed=type.get_bool(ID_C_packed);
exprt alignment=static_cast<const exprt &>(type.find(ID_C_alignment));
irept _typedef=type.find(ID_C_typedef);
type=type.subtype();
c_qualifiers.write(type);
if(packed)
type.set(ID_C_packed, true);
if(alignment.is_not_nil())
type.add(ID_C_alignment, alignment);
if(_typedef.is_not_nil())
type.add(ID_C_typedef, _typedef);
return; // done
}
// do we have alignment?
if(type.find(ID_C_alignment).is_not_nil())
{
exprt &alignment=static_cast<exprt &>(type.add(ID_C_alignment));
if(alignment.id()!=ID_default)
{
typecheck_expr(alignment);
make_constant(alignment);
}
}
if(type.id()==ID_code)
typecheck_code_type(to_code_type(type));
else if(type.id()==ID_array)
typecheck_array_type(to_array_type(type));
else if(type.id()==ID_pointer)
typecheck_type(type.subtype());
else if(type.id()==ID_struct ||
type.id()==ID_union)
typecheck_compound_type(to_struct_union_type(type));
else if(type.id()==ID_c_enum)
typecheck_c_enum_type(type);
else if(type.id()==ID_c_enum_tag)
typecheck_c_enum_tag_type(to_c_enum_tag_type(type));
else if(type.id()==ID_c_bit_field)
typecheck_c_bit_field_type(to_c_bit_field_type(type));
else if(type.id()==ID_typeof)
typecheck_typeof_type(type);
else if(type.id()==ID_symbol)
typecheck_symbol_type(type);
else if(type.id()==ID_vector)
typecheck_vector_type(to_vector_type(type));
else if(type.id()==ID_custom_unsignedbv ||
type.id()==ID_custom_signedbv ||
type.id()==ID_custom_floatbv ||
type.id()==ID_custom_fixedbv)
typecheck_custom_type(type);
else if(type.id()==ID_gcc_attribute_mode)
{
// get that mode
irep_idt mode=type.get(ID_size);
// A list of all modes ist at
// http://www.delorie.com/gnu/docs/gcc/gccint_53.html
typecheck_type(type.subtype());
typet underlying_type=type.subtype();
// gcc allows this, but clang doesn't; it's a compiler hint only,
// but we'll try to interpret it the GCC way
if(underlying_type.id()==ID_c_enum_tag)
{
underlying_type=
follow_tag(to_c_enum_tag_type(underlying_type)).subtype();
assert(underlying_type.id()==ID_signedbv ||
underlying_type.id()==ID_unsignedbv);
}
if(underlying_type.id()==ID_signedbv ||
underlying_type.id()==ID_unsignedbv)
{
bool is_signed=underlying_type.id()==ID_signedbv;
typet result;
if(mode=="__QI__") // 8 bits
result=is_signed?signed_char_type():unsigned_char_type();
else if(mode=="__byte__") // 8 bits
result=is_signed?signed_char_type():unsigned_char_type();
else if(mode=="__HI__") // 16 bits
result=is_signed?signed_short_int_type():unsigned_short_int_type();
else if(mode=="__SI__") // 32 bits
result=is_signed?signed_int_type():unsigned_int_type();
else if(mode=="__word__") // long int, we think
result=is_signed?signed_long_int_type():unsigned_long_int_type();
else if(mode=="__pointer__") // we think this is size_t/ssize_t
result=is_signed?signed_size_type():size_type();
else if(mode=="__DI__") // 64 bits
{
if(config.ansi_c.long_int_width==64)
result=is_signed?signed_long_int_type():unsigned_long_int_type();
else
{
assert(config.ansi_c.long_long_int_width==64);
result=
is_signed?signed_long_long_int_type():unsigned_long_long_int_type();
}
}
else if(mode=="__TI__") // 128 bits
result=is_signed?gcc_signed_int128_type():gcc_unsigned_int128_type();
else if(mode=="__V2SI__") // vector of 2 ints, deprecated by gcc
result=
vector_typet(
is_signed?signed_int_type():unsigned_int_type(),
from_integer(2, size_type()));
else if(mode=="__V4SI__") // vector of 4 ints, deprecated by gcc
result=
vector_typet(
is_signed?signed_int_type():unsigned_int_type(),
from_integer(4, size_type()));
else // give up, just use subtype
result=type.subtype();
// save the location
result.add_source_location()=type.source_location();
if(type.subtype().id()==ID_c_enum_tag)
{
const irep_idt &tag_name=
to_c_enum_tag_type(type.subtype()).get_identifier();
symbol_tablet::symbolst::iterator entry=
symbol_table.symbols.find(tag_name);
assert(entry!=symbol_table.symbols.end());
entry->second.type.subtype()=result;
}
type=result;
}
else if(underlying_type.id()==ID_floatbv)
{
typet result;
if(mode=="__SF__") // 32 bits
result=float_type();
else if(mode=="__DF__") // 64 bits
result=double_type();
else if(mode=="__TF__") // 128 bits
result=gcc_float128_type();
else if(mode=="__V2SF__") // vector of 2 floats, deprecated by gcc
result=vector_typet(float_type(), from_integer(2, size_type()));
else if(mode=="__V2DF__") // vector of 2 doubles, deprecated by gcc
result=vector_typet(double_type(), from_integer(2, size_type()));
else if(mode=="__V4SF__") // vector of 4 floats, deprecated by gcc
result=vector_typet(float_type(), from_integer(4, size_type()));
else if(mode=="__V4DF__") // vector of 4 doubles, deprecated by gcc
result=vector_typet(double_type(), from_integer(4, size_type()));
else // give up, just use subtype
result=type.subtype();
// save the location
result.add_source_location()=type.source_location();
type=result;
}
else if(underlying_type.id()==ID_complex)
{
// gcc allows this, but clang doesn't -- see enums above
typet result;
if(mode=="__SC__") // 32 bits
result=float_type();
else if(mode=="__DC__") // 64 bits
result=double_type();
else if(mode=="__TC__") // 128 bits
result=gcc_float128_type();
else // give up, just use subtype
result=type.subtype();
// save the location
result.add_source_location()=type.source_location();
type=complex_typet(result);
}
else
{
error().source_location=type.source_location();
error() << "attribute mode `" << mode
<< "' applied to inappropriate type `"
<< to_string(type) << "'" << eom;
throw 0;
}
}
// do a mild bit of rule checking
if(type.get_bool(ID_C_restricted) &&
type.id()!=ID_pointer &&
type.id()!=ID_array)
{
error().source_location=type.source_location();
error() << "only a pointer can be 'restrict'" << eom;
throw 0;
}
}
