static
tree cxx_enum_underlying_base_type (const_tree type)
{
tree underlying_type = ENUM_UNDERLYING_TYPE (type);
if (! ENUM_FIXED_UNDERLYING_TYPE_P (type))
underlying_type
= c_common_type_for_mode (TYPE_MODE (underlying_type),
TYPE_UNSIGNED (underlying_type));
return underlying_type;
}
tree
type_promotes_to (tree type)
{
tree promoted_type;
if (type == error_mark_node)
return error_mark_node;
type = TYPE_MAIN_VARIANT (type);
/* Check for promotions of target-defined types first. */
promoted_type = targetm.promoted_type (type);
if (promoted_type)
return promoted_type;
/* bool always promotes to int (not unsigned), even if it's the same
size. */
if (TREE_CODE (type) == BOOLEAN_TYPE)
type = integer_type_node;
/* Normally convert enums to int, but convert wide enums to something
wider. */
else if (TREE_CODE (type) == ENUMERAL_TYPE
|| type == char16_type_node
|| type == char32_type_node
|| type == wchar_type_node)
{
int precision = MAX (TYPE_PRECISION (type),
TYPE_PRECISION (integer_type_node));
tree totype = c_common_type_for_size (precision, 0);
if (TREE_CODE (type) == ENUMERAL_TYPE)
type = ENUM_UNDERLYING_TYPE (type);
if (TYPE_UNSIGNED (type)
&& ! int_fits_type_p (TYPE_MAX_VALUE (type), totype))
type = c_common_type_for_size (precision, 1);
else
type = totype;
}
else if (c_promoting_integer_type_p (type))
{
/* Retain unsignedness if really not getting bigger. */
if (TYPE_UNSIGNED (type)
&& TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node))
type = unsigned_type_node;
else
type = integer_type_node;
}
else if (type == float_type_node)
type = double_type_node;
return type;
}
tree
ocp_convert (tree type, tree expr, int convtype, int flags)
{
tree e = expr;
enum tree_code code = TREE_CODE (type);
const char *invalid_conv_diag;
tree e1;
if (error_operand_p (e) || type == error_mark_node)
return error_mark_node;
complete_type (type);
complete_type (TREE_TYPE (expr));
if ((invalid_conv_diag
= targetm.invalid_conversion (TREE_TYPE (expr), type)))
{
error (invalid_conv_diag);
return error_mark_node;
}
e = integral_constant_value (e);
if (error_operand_p (e))
return error_mark_node;
if (MAYBE_CLASS_TYPE_P (type) && (convtype & CONV_FORCE_TEMP))
/* We need a new temporary; don't take this shortcut. */;
else if (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (e)))
{
if (same_type_p (type, TREE_TYPE (e)))
/* The call to fold will not always remove the NOP_EXPR as
might be expected, since if one of the types is a typedef;
the comparison in fold is just equality of pointers, not a
call to comptypes. We don't call fold in this case because
that can result in infinite recursion; fold will call
convert, which will call ocp_convert, etc. */
return e;
/* For complex data types, we need to perform componentwise
conversion. */
else if (TREE_CODE (type) == COMPLEX_TYPE)
return fold_if_not_in_template (convert_to_complex (type, e));
else if (TREE_CODE (e) == TARGET_EXPR)
{
/* Don't build a NOP_EXPR of class type. Instead, change the
type of the temporary. */
TREE_TYPE (e) = TREE_TYPE (TARGET_EXPR_SLOT (e)) = type;
return e;
}
else
{
/* We shouldn't be treating objects of ADDRESSABLE type as
rvalues. */
gcc_assert (!TREE_ADDRESSABLE (type));
return fold_if_not_in_template (build_nop (type, e));
}
}
e1 = targetm.convert_to_type (type, e);
if (e1)
return e1;
if (code == VOID_TYPE && (convtype & CONV_STATIC))
{
e = convert_to_void (e, ICV_CAST, tf_warning_or_error);
return e;
}
if (INTEGRAL_CODE_P (code))
{
tree intype = TREE_TYPE (e);
if (TREE_CODE (type) == ENUMERAL_TYPE)
{
/* enum = enum, enum = int, enum = float, (enum)pointer are all
errors. */
if (((INTEGRAL_OR_ENUMERATION_TYPE_P (intype)
|| TREE_CODE (intype) == REAL_TYPE)
&& ! (convtype & CONV_STATIC))
|| TREE_CODE (intype) == POINTER_TYPE)
{
if (flags & LOOKUP_COMPLAIN)
permerror (input_location, "conversion from %q#T to %q#T", intype, type);
if (!flag_permissive)
return error_mark_node;
}
/* [expr.static.cast]
8. A value of integral or enumeration type can be explicitly
converted to an enumeration type. The value is unchanged if
the original value is within the range of the enumeration
values. Otherwise, the resulting enumeration value is
unspecified. */
if (TREE_CODE (expr) == INTEGER_CST
&& !int_fits_type_p (expr, ENUM_UNDERLYING_TYPE (type)))
warning (OPT_Wconversion,
"the result of the conversion is unspecified because "
"%qE is outside the range of type %qT",
expr, type);
}
if (MAYBE_CLASS_TYPE_P (intype))
{
tree rval;
rval = build_type_conversion (type, e);
if (rval)
return rval;
if (flags & LOOKUP_COMPLAIN)
error ("%q#T used where a %qT was expected", intype, type);
return error_mark_node;
}
if (code == BOOLEAN_TYPE)
return cp_truthvalue_conversion (e);
return fold_if_not_in_template (convert_to_integer (type, e));
}
if (NULLPTR_TYPE_P (type) && e && null_ptr_cst_p (e))
return nullptr_node;
if (POINTER_TYPE_P (type) || TYPE_PTR_TO_MEMBER_P (type))
return fold_if_not_in_template (cp_convert_to_pointer (type, e));
if (code == VECTOR_TYPE)
{
tree in_vtype = TREE_TYPE (e);
if (MAYBE_CLASS_TYPE_P (in_vtype))
{
tree ret_val;
ret_val = build_type_conversion (type, e);
if (ret_val)
return ret_val;
if (flags & LOOKUP_COMPLAIN)
error ("%q#T used where a %qT was expected", in_vtype, type);
return error_mark_node;
}
return fold_if_not_in_template (convert_to_vector (type, e));
}
if (code == REAL_TYPE || code == COMPLEX_TYPE)
{
if (MAYBE_CLASS_TYPE_P (TREE_TYPE (e)))
{
tree rval;
rval = build_type_conversion (type, e);
if (rval)
return rval;
else
if (flags & LOOKUP_COMPLAIN)
error ("%q#T used where a floating point value was expected",
TREE_TYPE (e));
}
if (code == REAL_TYPE)
return fold_if_not_in_template (convert_to_real (type, e));
else if (code == COMPLEX_TYPE)
return fold_if_not_in_template (convert_to_complex (type, e));
}
/* New C++ semantics: since assignment is now based on
memberwise copying, if the rhs type is derived from the
lhs type, then we may still do a conversion. */
if (RECORD_OR_UNION_CODE_P (code))
{
tree dtype = TREE_TYPE (e);
tree ctor = NULL_TREE;
dtype = TYPE_MAIN_VARIANT (dtype);
/* Conversion between aggregate types. New C++ semantics allow
objects of derived type to be cast to objects of base type.
Old semantics only allowed this between pointers.
There may be some ambiguity between using a constructor
vs. using a type conversion operator when both apply. */
ctor = e;
if (abstract_virtuals_error (NULL_TREE, type))
return error_mark_node;
if (BRACE_ENCLOSED_INITIALIZER_P (ctor))
ctor = perform_implicit_conversion (type, ctor, tf_warning_or_error);
else if ((flags & LOOKUP_ONLYCONVERTING)
&& ! (CLASS_TYPE_P (dtype) && DERIVED_FROM_P (type, dtype)))
/* For copy-initialization, first we create a temp of the proper type
with a user-defined conversion sequence, then we direct-initialize
the target with the temp (see [dcl.init]). */
ctor = build_user_type_conversion (type, ctor, flags);
else
{
VEC(tree,gc) *ctor_vec = make_tree_vector_single (ctor);
ctor = build_special_member_call (NULL_TREE,
complete_ctor_identifier,
&ctor_vec,
type, flags,
tf_warning_or_error);
release_tree_vector (ctor_vec);
}
if (ctor)
return build_cplus_new (type, ctor);
}
if (flags & LOOKUP_COMPLAIN)
{
/* If the conversion failed and expr was an invalid use of pointer to
member function, try to report a meaningful error. */
if (invalid_nonstatic_memfn_p (expr, tf_warning_or_error))
/* We displayed the error message. */;
else
error ("conversion from %qT to non-scalar type %qT requested",
TREE_TYPE (expr), type);
}
return error_mark_node;
}
