typet c_typecheck_baset::enum_constant_type(
const mp_integer &min_value,
const mp_integer &max_value) const
{
if(config.ansi_c.mode==configt::ansi_ct::flavourt::VISUAL_STUDIO)
{
return signed_int_type();
}
else
{
// enum constants are at least 'int', but may be made larger.
// 'Packing' has no influence.
if(max_value<(mp_integer(1)<<(config.ansi_c.int_width-1)) &&
min_value>=-(mp_integer(1)<<(config.ansi_c.int_width-1)))
return signed_int_type();
else if(max_value<(mp_integer(1)<<config.ansi_c.int_width) &&
min_value>=0)
return unsigned_int_type();
else if(max_value<(mp_integer(1)<<config.ansi_c.long_int_width) &&
min_value>=0)
return unsigned_long_int_type();
else if(max_value<(mp_integer(1)<<config.ansi_c.long_long_int_width) &&
min_value>=0)
return unsigned_long_long_int_type();
else if(max_value<(mp_integer(1)<<(config.ansi_c.long_int_width-1)) &&
min_value>=-(mp_integer(1)<<(config.ansi_c.long_int_width-1)))
return signed_long_int_type();
else
return signed_long_long_int_type();
}
}
typet c_typecheck_baset::enum_underlying_type(
const mp_integer &min_value,
const mp_integer &max_value,
bool is_packed) const
{
if(config.ansi_c.mode==configt::ansi_ct::flavourt::VISUAL_STUDIO)
{
return signed_int_type();
}
else
{
if(min_value<0)
{
// We'll want a signed type.
if(is_packed)
{
// If packed, there are smaller options.
if(max_value<(mp_integer(1)<<(config.ansi_c.char_width-1)) &&
min_value>=-(mp_integer(1)<<(config.ansi_c.char_width-1)))
return signed_char_type();
else if(max_value<(mp_integer(1)<<(config.ansi_c.short_int_width-1)) &&
min_value>=-(mp_integer(1)<<(config.ansi_c.short_int_width-1)))
return signed_short_int_type();
}
if(max_value<(mp_integer(1)<<(config.ansi_c.int_width-1)) &&
min_value>=-(mp_integer(1)<<(config.ansi_c.int_width-1)))
return signed_int_type();
else if(max_value<(mp_integer(1)<<(config.ansi_c.long_int_width-1)) &&
min_value>=-(mp_integer(1)<<(config.ansi_c.long_int_width-1)))
return signed_long_int_type();
else
return signed_long_long_int_type();
}
else
{
// We'll want an unsigned type.
if(is_packed)
{
// If packed, there are smaller options.
if(max_value<(mp_integer(1)<<config.ansi_c.char_width))
return unsigned_char_type();
else if(max_value<(mp_integer(1)<<config.ansi_c.short_int_width))
return unsigned_short_int_type();
}
if(max_value<(mp_integer(1)<<config.ansi_c.int_width))
return unsigned_int_type();
else if(max_value<(mp_integer(1)<<config.ansi_c.long_int_width))
return unsigned_long_int_type();
else
return unsigned_long_long_int_type();
}
}
}
typet pointer_diff_type()
{
// The pointer-diff type varies. This is signed int on some systems,
// and signed long int on others, and signed long long on say Windows.
if(config.ansi_c.pointer_width==config.ansi_c.int_width)
return signed_int_type();
else if(config.ansi_c.pointer_width==config.ansi_c.long_int_width)
return signed_long_int_type();
else if(config.ansi_c.pointer_width==config.ansi_c.long_long_int_width)
return signed_long_long_int_type();
else
assert(false); // aaah!
}
signedbv_typet pointer_diff_type()
{
// The pointer-diff type varies. This is signed int on some systems,
// and signed long int on others, and signed long long on say Windows.
if(config.ansi_c.pointer_width==config.ansi_c.int_width)
return signed_int_type();
else if(config.ansi_c.pointer_width==config.ansi_c.long_int_width)
return signed_long_int_type();
else if(config.ansi_c.pointer_width==config.ansi_c.long_long_int_width)
return signed_long_long_int_type();
else
INVARIANT(false, "width of pointer difference");
}
void c_typecastt::implicit_typecast_arithmetic(
exprt &expr,
c_typet c_type)
{
typet new_type;
const typet &expr_type=ns.follow(expr.type());
switch(c_type)
{
case PTR:
if(expr_type.id()==ID_array)
{
new_type.id(ID_pointer);
new_type.subtype()=expr_type.subtype();
break;
}
return;
case BOOL: assert(false); // should always be promoted to int
case CHAR: assert(false); // should always be promoted to int
case UCHAR: assert(false); // should always be promoted to int
case SHORT: assert(false); // should always be promoted to int
case USHORT: assert(false); // should always be promoted to int
case INT: new_type=signed_int_type(); break;
case UINT: new_type=unsigned_int_type(); break;
case LONG: new_type=signed_long_int_type(); break;
case ULONG: new_type=unsigned_long_int_type(); break;
case LONGLONG: new_type=signed_long_long_int_type(); break;
case ULONGLONG: new_type=unsigned_long_long_int_type(); break;
case SINGLE: new_type=float_type(); break;
case DOUBLE: new_type=double_type(); break;
case LONGDOUBLE: new_type=long_double_type(); break;
case FLOAT128: new_type=ieee_float_spect::quadruple_precision().to_type(); break;
case RATIONAL: new_type=rational_typet(); break;
case REAL: new_type=real_typet(); break;
case INTEGER: new_type=integer_typet(); break;
case COMPLEX: return; // do nothing
default: return;
}
if(new_type!=expr_type)
do_typecast(expr, new_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;
}
}
typet get_type(const format_tokent &token)
{
switch(token.type)
{
case format_tokent::INT:
switch(token.length_modifier)
{
case format_tokent::LEN_h:
if(token.representation==format_tokent::SIGNED_DEC)
return signed_char_type();
else
return unsigned_char_type();
case format_tokent::LEN_hh:
if(token.representation==format_tokent::SIGNED_DEC)
return signed_short_int_type();
else
return unsigned_short_int_type();
case format_tokent::LEN_l:
if(token.representation==format_tokent::SIGNED_DEC)
return signed_long_int_type();
else
return unsigned_long_int_type();
case format_tokent::LEN_ll:
if(token.representation==format_tokent::SIGNED_DEC)
return signed_long_long_int_type();
else
return unsigned_long_long_int_type();
default:
if(token.representation==format_tokent::SIGNED_DEC)
return signed_int_type();
else
return unsigned_int_type();
}
case format_tokent::FLOAT:
switch(token.length_modifier)
{
case format_tokent::LEN_l: return double_type();
case format_tokent::LEN_L: return long_double_type();
default: return float_type();
}
case format_tokent::CHAR:
switch(token.length_modifier)
{
case format_tokent::LEN_l: return wchar_t_type();
default: return char_type();
}
case format_tokent::POINTER:
return pointer_type(void_type());
case format_tokent::STRING:
switch(token.length_modifier)
{
case format_tokent::LEN_l: return array_typet(wchar_t_type(), nil_exprt());
default: return array_typet(char_type(), nil_exprt());
}
default:
return nil_typet();
}
}
