#include "config.h"
#include "system.h"
#include "tree.h"
#include "flags.h"
#include "cp-tree.h"
#include "convert.h"
#include "toplev.h"
#include "decl.h"
static tree cp_convert_to_pointer PROTO((tree, tree));
static tree convert_to_pointer_force PROTO((tree, tree));
static tree build_up_reference PROTO((tree, tree, int));
static tree
cp_convert_to_pointer (type, expr)
tree type, expr;
{
register tree intype = TREE_TYPE (expr);
register enum tree_code form;
tree rval;
if (IS_AGGR_TYPE (intype))
{
intype = complete_type (intype);
if (TYPE_SIZE (intype) == NULL_TREE)
{
cp_error ("can't convert from incomplete type `%T' to `%T'",
intype, type);
return error_mark_node;
}
rval = build_type_conversion (type, expr, 1);
if (rval)
{
if (rval == error_mark_node)
cp_error ("conversion of `%E' from `%T' to `%T' is ambiguous",
expr, intype, type);
return rval;
}
}
if (TREE_CODE (type) == POINTER_TYPE
&& (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
|| TYPE_MAIN_VARIANT (TREE_TYPE (type)) == void_type_node))
{
if (TYPE_PTRMEMFUNC_P (intype))
{
tree fntype = TREE_TYPE (TYPE_PTRMEMFUNC_FN_TYPE (intype));
tree decl = maybe_dummy_object (TYPE_METHOD_BASETYPE (fntype), 0);
expr = build (OFFSET_REF, fntype, decl, expr);
}
if (TREE_CODE (expr) == OFFSET_REF
&& TREE_CODE (TREE_TYPE (expr)) == METHOD_TYPE)
expr = resolve_offset_ref (expr);
if (TREE_CODE (TREE_TYPE (expr)) == METHOD_TYPE)
expr = build_addr_func (expr);
if (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE)
{
if (TREE_CODE (TREE_TYPE (TREE_TYPE (expr))) == METHOD_TYPE)
if (pedantic || warn_pmf2ptr)
cp_pedwarn ("converting from `%T' to `%T'", TREE_TYPE (expr),
type);
return build1 (NOP_EXPR, type, expr);
}
intype = TREE_TYPE (expr);
}
form = TREE_CODE (intype);
if (POINTER_TYPE_P (intype))
{
intype = TYPE_MAIN_VARIANT (intype);
if (TYPE_MAIN_VARIANT (type) != intype
&& TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (type)) == RECORD_TYPE
&& IS_AGGR_TYPE (TREE_TYPE (type))
&& IS_AGGR_TYPE (TREE_TYPE (intype))
&& TREE_CODE (TREE_TYPE (intype)) == RECORD_TYPE
&& !integer_zerop (expr))
{
enum tree_code code = PLUS_EXPR;
tree binfo = get_binfo (TREE_TYPE (type), TREE_TYPE (intype), 1);
if (binfo == error_mark_node)
return error_mark_node;
if (binfo == NULL_TREE)
{
binfo = get_binfo (TREE_TYPE (intype), TREE_TYPE (type), 1);
if (binfo == error_mark_node)
return error_mark_node;
code = MINUS_EXPR;
}
if (binfo)
{
if (TYPE_USES_VIRTUAL_BASECLASSES (TREE_TYPE (type))
|| TYPE_USES_VIRTUAL_BASECLASSES (TREE_TYPE (intype))
|| ! BINFO_OFFSET_ZEROP (binfo))
{
tree path;
if (code == PLUS_EXPR)
get_base_distance (TREE_TYPE (type), TREE_TYPE (intype),
0, &path);
else
get_base_distance (TREE_TYPE (intype), TREE_TYPE (type),
0, &path);
return build_vbase_path (code, type, expr, path, 0);
}
}
}
if (TYPE_PTRMEM_P (type) && TYPE_PTRMEM_P (intype))
{
tree b1 = TYPE_OFFSET_BASETYPE (TREE_TYPE (type));
tree b2 = TYPE_OFFSET_BASETYPE (TREE_TYPE (intype));
tree binfo = get_binfo (b2, b1, 1);
enum tree_code code = PLUS_EXPR;
if (binfo == NULL_TREE)
{
binfo = get_binfo (b1, b2, 1);
code = MINUS_EXPR;
}
if (binfo == error_mark_node)
return error_mark_node;
if (binfo && ! TREE_VIA_VIRTUAL (binfo))
expr = size_binop (code, expr, BINFO_OFFSET (binfo));
}
else if (TYPE_PTRMEMFUNC_P (type))
{
cp_error ("cannot convert `%E' from type `%T' to type `%T'",
expr, intype, type);
return error_mark_node;
}
rval = build1 (NOP_EXPR, type, expr);
TREE_CONSTANT (rval) = TREE_CONSTANT (expr);
return rval;
}
else if (TYPE_PTRMEMFUNC_P (type) && TYPE_PTRMEMFUNC_P (intype))
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr, 1);
else if (TYPE_PTRMEMFUNC_P (intype))
{
cp_error ("cannot convert `%E' from type `%T' to type `%T'",
expr, intype, type);
return error_mark_node;
}
my_friendly_assert (form != OFFSET_TYPE, 186);
if (TYPE_LANG_SPECIFIC (intype)
&& (IS_SIGNATURE_POINTER (intype) || IS_SIGNATURE_REFERENCE (intype)))
return convert_to_pointer (type, build_optr_ref (expr));
if (integer_zerop (expr))
{
if (TYPE_PTRMEMFUNC_P (type))
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), expr, 0);
expr = build_int_2 (0, 0);
TREE_TYPE (expr) = type;
return expr;
}
if (INTEGRAL_CODE_P (form))
{
if (TYPE_PRECISION (intype) == POINTER_SIZE)
return build1 (CONVERT_EXPR, type, expr);
expr = cp_convert (type_for_size (POINTER_SIZE, 0), expr);
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr)))
!= GET_MODE_SIZE (TYPE_MODE (type)))
abort ();
return convert_to_pointer (type, expr);
}
if (type_unknown_p (expr))
return instantiate_type (type, expr, 1);
cp_error ("cannot convert `%E' from type `%T' to type `%T'",
expr, intype, type);
return error_mark_node;
}
static tree
convert_to_pointer_force (type, expr)
tree type, expr;
{
register tree intype = TREE_TYPE (expr);
register enum tree_code form = TREE_CODE (intype);
if (integer_zerop (expr))
{
expr = build_int_2 (0, 0);
TREE_TYPE (expr) = type;
return expr;
}
if (form == RECORD_TYPE
&& (IS_SIGNATURE_POINTER (intype) || IS_SIGNATURE_REFERENCE (intype)))
{
expr = build_optr_ref (expr);
intype = TREE_TYPE (expr);
form = TREE_CODE (intype);
}
if (form == POINTER_TYPE)
{
intype = TYPE_MAIN_VARIANT (intype);
if (TYPE_MAIN_VARIANT (type) != intype
&& TREE_CODE (TREE_TYPE (type)) == RECORD_TYPE
&& IS_AGGR_TYPE (TREE_TYPE (type))
&& IS_AGGR_TYPE (TREE_TYPE (intype))
&& TREE_CODE (TREE_TYPE (intype)) == RECORD_TYPE)
{
enum tree_code code = PLUS_EXPR;
tree path;
int distance = get_base_distance (TREE_TYPE (type),
TREE_TYPE (intype), 0, &path);
if (distance == -2)
{
ambig:
cp_error ("type `%T' is ambiguous baseclass of `%s'",
TREE_TYPE (type),
TYPE_NAME_STRING (TREE_TYPE (intype)));
return error_mark_node;
}
if (distance == -1)
{
distance = get_base_distance (TREE_TYPE (intype),
TREE_TYPE (type), 0, &path);
if (distance == -2)
goto ambig;
if (distance < 0)
return build1 (NOP_EXPR, type, expr);
code = MINUS_EXPR;
}
return build_vbase_path (code, type, expr, path, 0);
}
}
return cp_convert_to_pointer (type, expr);
}
static tree
build_up_reference (type, arg, flags)
tree type, arg;
int flags;
{
tree rval;
tree argtype = TREE_TYPE (arg);
tree target_type = TREE_TYPE (type);
my_friendly_assert (TREE_CODE (type) == REFERENCE_TYPE, 187);
if ((flags & DIRECT_BIND) && ! real_lvalue_p (arg))
{
tree targ = arg;
if (toplevel_bindings_p ())
arg = get_temp_name (argtype, 1);
else
{
arg = pushdecl (build_decl (VAR_DECL, NULL_TREE, argtype));
DECL_ARTIFICIAL (arg) = 1;
}
DECL_INITIAL (arg) = targ;
cp_finish_decl (arg, targ, NULL_TREE, 0,
LOOKUP_ONLYCONVERTING|DIRECT_BIND);
}
else if (!(flags & DIRECT_BIND) && ! lvalue_p (arg))
{
tree slot = build_decl (VAR_DECL, NULL_TREE, argtype);
DECL_ARTIFICIAL (slot) = 1;
arg = build (TARGET_EXPR, argtype, slot, arg, NULL_TREE, NULL_TREE);
TREE_SIDE_EFFECTS (arg) = 1;
}
rval = build_unary_op (ADDR_EXPR, arg, 1);
if (rval == error_mark_node)
return error_mark_node;
if ((flags & LOOKUP_PROTECT)
&& TYPE_MAIN_VARIANT (argtype) != TYPE_MAIN_VARIANT (target_type)
&& IS_AGGR_TYPE (argtype)
&& IS_AGGR_TYPE (target_type))
{
tree binfo = get_binfo (target_type, argtype, 1);
if (binfo == error_mark_node)
return error_mark_node;
if (binfo == NULL_TREE)
return error_not_base_type (target_type, argtype);
rval = convert_pointer_to_real (binfo, rval);
}
else
rval
= convert_to_pointer_force (build_pointer_type (target_type), rval);
rval = build1 (NOP_EXPR, type, rval);
TREE_CONSTANT (rval) = TREE_CONSTANT (TREE_OPERAND (rval, 0));
return rval;
}
tree
convert_to_reference (reftype, expr, convtype, flags, decl)
tree reftype, expr;
int convtype, flags;
tree decl;
{
register tree type = TYPE_MAIN_VARIANT (TREE_TYPE (reftype));
register tree intype = TREE_TYPE (expr);
tree rval = NULL_TREE;
tree rval_as_conversion = NULL_TREE;
int i;
if (TREE_CODE (type) == FUNCTION_TYPE && intype == unknown_type_node)
{
expr = instantiate_type (type, expr,
(flags & LOOKUP_COMPLAIN) != 0);
if (expr == error_mark_node)
return error_mark_node;
intype = TREE_TYPE (expr);
}
if (TREE_CODE (intype) == REFERENCE_TYPE)
my_friendly_abort (364);
intype = TYPE_MAIN_VARIANT (intype);
i = comp_target_types (type, intype, 0);
if (i <= 0 && (convtype & CONV_IMPLICIT) && IS_AGGR_TYPE (intype)
&& ! (flags & LOOKUP_NO_CONVERSION))
{
rval_as_conversion
= build_type_conversion (reftype, expr, 1);
if (rval_as_conversion && rval_as_conversion != error_mark_node
&& real_lvalue_p (rval_as_conversion))
{
expr = rval_as_conversion;
rval_as_conversion = NULL_TREE;
intype = type;
i = 1;
}
}
if (((convtype & CONV_STATIC) && i == -1)
|| ((convtype & CONV_IMPLICIT) && i == 1))
{
if (flags & LOOKUP_COMPLAIN)
{
tree ttl = TREE_TYPE (reftype);
tree ttr = lvalue_type (expr);
if (! real_lvalue_p (expr)
&& !CP_TYPE_CONST_NON_VOLATILE_P (ttl))
{
const char *msg;
if (CP_TYPE_VOLATILE_P (ttl) && decl)
msg = "initialization of volatile reference type `%#T'";
else if (CP_TYPE_VOLATILE_P (ttl))
msg = "conversion to volatile reference type `%#T'";
else if (decl)
msg = "initialization of non-const reference type `%#T'";
else
msg = "conversion to non-const reference type `%#T'";
cp_pedwarn (msg, reftype);
cp_pedwarn ("from rvalue of type `%T'", intype);
}
else if (! (convtype & CONV_CONST)
&& !at_least_as_qualified_p (ttl, ttr))
cp_pedwarn ("conversion from `%T' to `%T' discards qualifiers",
ttr, reftype);
}
return build_up_reference (reftype, expr, flags);
}
else if ((convtype & CONV_REINTERPRET) && lvalue_p (expr))
{
if (TREE_CODE (intype) == POINTER_TYPE
&& (comptypes (TREE_TYPE (intype), type,
COMPARE_BASE | COMPARE_RELAXED )))
cp_warning ("casting `%T' to `%T' does not dereference pointer",
intype, reftype);
rval = build_unary_op (ADDR_EXPR, expr, 0);
if (rval != error_mark_node)
rval = convert_force (build_pointer_type (TREE_TYPE (reftype)),
rval, 0);
if (rval != error_mark_node)
rval = build1 (NOP_EXPR, reftype, rval);
}
else
{
rval = convert_for_initialization (NULL_TREE, type, expr, flags,
"converting", 0, 0);
if (rval == NULL_TREE || rval == error_mark_node)
return rval;
rval = build_up_reference (reftype, rval, flags);
if (rval && ! CP_TYPE_CONST_P (TREE_TYPE (reftype)))
cp_pedwarn ("initializing non-const `%T' with `%T' will use a temporary",
reftype, intype);
}
if (rval)
{
return rval;
}
my_friendly_assert (TREE_CODE (intype) != OFFSET_TYPE, 189);
if (flags & LOOKUP_COMPLAIN)
cp_error ("cannot convert type `%T' to type `%T'", intype, reftype);
if (flags & LOOKUP_SPECULATIVELY)
return NULL_TREE;
return error_mark_node;
}
tree
convert_from_reference (val)
tree val;
{
tree type = TREE_TYPE (val);
if (TREE_CODE (type) == OFFSET_TYPE)
type = TREE_TYPE (type);
if (TREE_CODE (type) == REFERENCE_TYPE)
return build_indirect_ref (val, NULL_PTR);
return val;
}
tree
convert_pointer_to_real (binfo, expr)
tree binfo, expr;
{
register tree intype = TREE_TYPE (expr);
tree ptr_type;
tree type, rval;
if (intype == error_mark_node)
return error_mark_node;
if (TREE_CODE (binfo) == TREE_VEC)
type = BINFO_TYPE (binfo);
else if (IS_AGGR_TYPE (binfo))
{
type = binfo;
}
else
{
type = binfo;
binfo = NULL_TREE;
}
ptr_type = cp_build_qualified_type (type,
CP_TYPE_QUALS (TREE_TYPE (intype)));
ptr_type = build_pointer_type (ptr_type);
if (same_type_p (ptr_type, TYPE_MAIN_VARIANT (intype)))
return expr;
my_friendly_assert (!integer_zerop (expr), 191);
intype = TYPE_MAIN_VARIANT (TREE_TYPE (intype));
if (TREE_CODE (type) == RECORD_TYPE
&& TREE_CODE (intype) == RECORD_TYPE
&& type != intype)
{
tree path;
int distance
= get_base_distance (binfo, intype, 0, &path);
if (distance < 0)
{
cp_error ("cannot convert a pointer of type `%T' to a pointer of type `%T'",
intype, type);
if (distance == -2)
cp_error ("because `%T' is an ambiguous base class", type);
return error_mark_node;
}
return build_vbase_path (PLUS_EXPR, ptr_type, expr, path, 1);
}
rval = build1 (NOP_EXPR, ptr_type,
TREE_CODE (expr) == NOP_EXPR ? TREE_OPERAND (expr, 0) : expr);
TREE_CONSTANT (rval) = TREE_CONSTANT (expr);
return rval;
}
tree
convert_pointer_to (binfo, expr)
tree binfo, expr;
{
tree type;
if (TREE_CODE (binfo) == TREE_VEC)
type = BINFO_TYPE (binfo);
else if (IS_AGGR_TYPE (binfo))
type = binfo;
else
type = binfo;
return convert_pointer_to_real (type, expr);
}
tree
cp_convert (type, expr)
tree type, expr;
{
return ocp_convert (type, expr, CONV_OLD_CONVERT, LOOKUP_NORMAL);
}
tree
ocp_convert (type, expr, convtype, flags)
tree type, expr;
int convtype, flags;
{
register tree e = expr;
register enum tree_code code = TREE_CODE (type);
if (e == error_mark_node
|| TREE_TYPE (e) == error_mark_node)
return error_mark_node;
if (TREE_READONLY_DECL_P (e))
e = decl_constant_value (e);
if (IS_AGGR_TYPE (type) && (convtype & CONV_FORCE_TEMP)
&& TYPE_HAS_CONSTRUCTOR (type))
;
else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (e)))
{
if (same_type_p (type, TREE_TYPE (e)))
return e;
else
return fold (build1 (NOP_EXPR, type, e));
}
if (code == VOID_TYPE && (convtype & CONV_STATIC))
{
e = require_complete_type_in_void (e);
if (e != error_mark_node)
e = build1 (CONVERT_EXPR, void_type_node, e);
return e;
}
#if 0
if (TREE_CODE (e) == NOP_EXPR)
return cp_convert (type, TREE_OPERAND (e, 0));
#endif
if (code == OFFSET_TYPE)
{
type = TREE_TYPE (type);
code = TREE_CODE (type);
}
#if 0
if (code == REFERENCE_TYPE)
return fold (convert_to_reference (type, e, convtype, flags, NULL_TREE));
else if (TREE_CODE (TREE_TYPE (e)) == REFERENCE_TYPE)
e = convert_from_reference (e);
#endif
if (TREE_CODE (e) == OFFSET_REF)
e = resolve_offset_ref (e);
if (INTEGRAL_CODE_P (code))
{
tree intype = TREE_TYPE (e);
if (TREE_CODE (type) == ENUMERAL_TYPE
&& ((ARITHMETIC_TYPE_P (intype) && ! (convtype & CONV_STATIC))
|| (TREE_CODE (intype) == POINTER_TYPE)))
{
cp_pedwarn ("conversion from `%#T' to `%#T'", intype, type);
if (flag_pedantic_errors)
return error_mark_node;
}
if (IS_AGGR_TYPE (intype))
{
tree rval;
rval = build_type_conversion (type, e, 1);
if (rval)
return rval;
if (flags & LOOKUP_COMPLAIN)
cp_error ("`%#T' used where a `%T' was expected", intype, type);
if (flags & LOOKUP_SPECULATIVELY)
return NULL_TREE;
return error_mark_node;
}
if (code == BOOLEAN_TYPE)
{
if (TREE_CODE (expr) == FUNCTION_DECL)
cp_warning ("the address of `%D', will always be `true'", expr);
return truthvalue_conversion (e);
}
return fold (convert_to_integer (type, e));
}
if (code == POINTER_TYPE || code == REFERENCE_TYPE
|| TYPE_PTRMEMFUNC_P (type))
return fold (cp_convert_to_pointer (type, e));
if (code == REAL_TYPE || code == COMPLEX_TYPE)
{
if (IS_AGGR_TYPE (TREE_TYPE (e)))
{
tree rval;
rval = build_type_conversion (type, e, 1);
if (rval)
return rval;
else
if (flags & LOOKUP_COMPLAIN)
cp_error ("`%#T' used where a floating point value was expected",
TREE_TYPE (e));
}
if (code == REAL_TYPE)
return fold (convert_to_real (type, e));
else if (code == COMPLEX_TYPE)
return fold (convert_to_complex (type, e));
}
if (code == VECTOR_TYPE)
{
if (IS_AGGR_TYPE (TREE_TYPE (e)))
{
tree rval;
rval = build_type_conversion (type, e, 1);
if (rval)
return rval;
else
if (flags & LOOKUP_COMPLAIN)
cp_error ("`%#T' used where a vector value was expected",
TREE_TYPE (e));
}
return fold (convert_to_vector (type, e));
}
if (IS_AGGR_TYPE_CODE (code))
{
tree dtype = TREE_TYPE (e);
tree ctor = NULL_TREE;
dtype = TYPE_MAIN_VARIANT (dtype);
if (TYPE_LANG_SPECIFIC (type)
&& (IS_SIGNATURE_POINTER (type) || IS_SIGNATURE_REFERENCE (type)))
{
tree constructor = build_signature_pointer_constructor (type, expr);
tree sig_ty = SIGNATURE_TYPE (type);
tree sig_ptr;
if (constructor == error_mark_node)
return error_mark_node;
sig_ptr = get_temp_name (type, 1);
DECL_INITIAL (sig_ptr) = constructor;
CLEAR_SIGNATURE (sig_ty);
cp_finish_decl (sig_ptr, constructor, NULL_TREE, 0, 0);
SET_SIGNATURE (sig_ty);
TREE_READONLY (sig_ptr) = 1;
return sig_ptr;
}
ctor = e;
if (IS_AGGR_TYPE (type) && CLASSTYPE_ABSTRACT_VIRTUALS (type))
{
abstract_virtuals_error (NULL_TREE, type);
return error_mark_node;
}
if ((flags & LOOKUP_ONLYCONVERTING)
&& ! (IS_AGGR_TYPE (dtype) && DERIVED_FROM_P (type, dtype)))
ctor = build_user_type_conversion (type, ctor, flags);
if (ctor)
ctor = build_method_call (NULL_TREE, ctor_identifier,
build_expr_list (NULL_TREE, ctor),
TYPE_BINFO (type), flags);
if (ctor)
return build_cplus_new (type, ctor);
}
if (code == ARRAY_TYPE
&& TREE_TYPE (TREE_TYPE (e)) == TREE_TYPE (type)
&& index_type_equal (TYPE_DOMAIN (TREE_TYPE (e)), TYPE_DOMAIN (type)))
return e;
if (flags & LOOKUP_COMPLAIN)
cp_error ("conversion from `%T' to non-scalar type `%T' requested",
TREE_TYPE (expr), type);
if (flags & LOOKUP_SPECULATIVELY)
return NULL_TREE;
return error_mark_node;
}
tree
convert (type, expr)
tree type, expr;
{
tree intype;
if (type == error_mark_node || expr == error_mark_node)
return error_mark_node;
intype = TREE_TYPE (expr);
if (POINTER_TYPE_P (type) && POINTER_TYPE_P (intype))
{
if (TREE_READONLY_DECL_P (expr))
expr = decl_constant_value (expr);
return fold (build1 (NOP_EXPR, type, expr));
}
return ocp_convert (type, expr, CONV_OLD_CONVERT,
LOOKUP_NORMAL|LOOKUP_NO_CONVERSION);
}
tree
convert_force (type, expr, convtype)
tree type;
tree expr;
int convtype;
{
register tree e = expr;
register enum tree_code code = TREE_CODE (type);
if (code == REFERENCE_TYPE)
return fold (convert_to_reference (type, e, CONV_C_CAST, LOOKUP_COMPLAIN,
NULL_TREE));
else if (TREE_CODE (TREE_TYPE (e)) == REFERENCE_TYPE)
e = convert_from_reference (e);
if (code == POINTER_TYPE)
return fold (convert_to_pointer_force (type, e));
if (((TREE_CODE (TREE_TYPE (e)) == POINTER_TYPE && TREE_CODE (e) == ADDR_EXPR
&& TREE_CODE (TREE_TYPE (e)) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (TREE_TYPE (e))) == METHOD_TYPE)
|| integer_zerop (e)
|| TYPE_PTRMEMFUNC_P (TREE_TYPE (e)))
&& TYPE_PTRMEMFUNC_P (type))
{
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), e, 1);
}
return ocp_convert (type, e, CONV_C_CAST|convtype, LOOKUP_NORMAL);
}
tree
build_type_conversion (xtype, expr, for_sure)
tree xtype, expr;
int for_sure;
{
return build_user_type_conversion
(xtype, expr, for_sure ? LOOKUP_NORMAL : 0);
}
tree
build_expr_type_conversion (desires, expr, complain)
int desires;
tree expr;
int complain;
{
tree basetype = TREE_TYPE (expr);
tree conv = NULL_TREE;
tree winner = NULL_TREE;
if (expr == null_node
&& (desires & WANT_INT)
&& !(desires & WANT_NULL))
cp_warning ("converting NULL to non-pointer type");
if (TREE_CODE (expr) == OFFSET_REF)
expr = resolve_offset_ref (expr);
expr = convert_from_reference (expr);
basetype = TREE_TYPE (expr);
if (! IS_AGGR_TYPE (basetype))
switch (TREE_CODE (basetype))
{
case INTEGER_TYPE:
if ((desires & WANT_NULL) && null_ptr_cst_p (expr))
return expr;
case BOOLEAN_TYPE:
return (desires & WANT_INT) ? expr : NULL_TREE;
case ENUMERAL_TYPE:
return (desires & WANT_ENUM) ? expr : NULL_TREE;
case REAL_TYPE:
return (desires & WANT_FLOAT) ? expr : NULL_TREE;
case POINTER_TYPE:
return (desires & WANT_POINTER) ? expr : NULL_TREE;
case FUNCTION_TYPE:
case ARRAY_TYPE:
return (desires & WANT_POINTER) ? default_conversion (expr)
: NULL_TREE;
default:
return NULL_TREE;
}
if (! TYPE_HAS_CONVERSION (basetype))
return NULL_TREE;
for (conv = lookup_conversions (basetype); conv; conv = TREE_CHAIN (conv))
{
int win = 0;
tree candidate;
tree cand = TREE_VALUE (conv);
if (winner && winner == cand)
continue;
candidate = TREE_TYPE (TREE_TYPE (cand));
if (TREE_CODE (candidate) == REFERENCE_TYPE)
candidate = TREE_TYPE (candidate);
switch (TREE_CODE (candidate))
{
case BOOLEAN_TYPE:
case INTEGER_TYPE:
win = (desires & WANT_INT); break;
case ENUMERAL_TYPE:
win = (desires & WANT_ENUM); break;
case REAL_TYPE:
win = (desires & WANT_FLOAT); break;
case POINTER_TYPE:
win = (desires & WANT_POINTER); break;
default:
break;
}
if (win)
{
if (winner)
{
if (complain)
{
cp_error ("ambiguous default type conversion from `%T'",
basetype);
cp_error (" candidate conversions include `%D' and `%D'",
winner, cand);
}
return error_mark_node;
}
else
winner = cand;
}
}
if (winner)
{
tree type = TREE_TYPE (TREE_TYPE (winner));
if (TREE_CODE (type) == REFERENCE_TYPE)
type = TREE_TYPE (type);
return build_user_type_conversion (type, expr, LOOKUP_NORMAL);
}
return NULL_TREE;
}
tree
type_promotes_to (type)
tree type;
{
int type_quals;
if (type == error_mark_node)
return error_mark_node;
type_quals = CP_TYPE_QUALS (type);
type = TYPE_MAIN_VARIANT (type);
if (type == boolean_type_node)
type = integer_type_node;
else if (TREE_CODE (type) == ENUMERAL_TYPE
|| type == wchar_type_node)
{
int precision = MAX (TYPE_PRECISION (type),
TYPE_PRECISION (integer_type_node));
tree totype = type_for_size (precision, 0);
if (TREE_UNSIGNED (type)
&& ! int_fits_type_p (TYPE_MAX_VALUE (type), totype))
type = type_for_size (precision, 1);
else
type = totype;
}
else if (C_PROMOTING_INTEGER_TYPE_P (type))
{
if (TREE_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 cp_build_qualified_type (type, type_quals);
}
tree
perform_qualification_conversions (type, expr)
tree type;
tree expr;
{
if (TREE_CODE (type) == POINTER_TYPE
&& TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE
&& comp_ptr_ttypes (TREE_TYPE (type), TREE_TYPE (TREE_TYPE (expr))))
return build1 (NOP_EXPR, type, expr);
else
return error_mark_node;
}