/* Language-level data type conversion for GNU C++.
Copyright (C) 1987, 1988, 1992, 1993 Free Software Foundation, Inc.
Hacked by Michael Tiemann (tiemann@cygnus.com)
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* This file contains the functions for converting C expressions
to different data types. The only entry point is `convert'.
Every language front end must have a `convert' function
but what kind of conversions it does will depend on the language. */
/* Change of width--truncation and extension of integers or reals--
is represented with NOP_EXPR. Proper functioning of many things
assumes that no other conversions can be NOP_EXPRs.
Conversion between integer and pointer is represented with CONVERT_EXPR.
Converting integer to real uses FLOAT_EXPR
and real to integer uses FIX_TRUNC_EXPR.
Here is a list of all the functions that assume that widening and
narrowing is always done with a NOP_EXPR:
In c-convert.c, convert_to_integer.
In c-typeck.c, build_binary_op_nodefault (boolean ops),
and truthvalue_conversion.
In expr.c: expand_expr, for operands of a MULT_EXPR.
In tree.c: get_narrower and get_unwidened.
C++: in multiple-inheritance, converting between pointers may involve
adjusting them by a delta stored within the class definition. */
/* Subroutines of `convert'. */
cp_convert_to_pointer (type
, expr
)
register tree intype
= TREE_TYPE (expr
);
register enum tree_code 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
&& TREE_CODE (TREE_TYPE (intype
)) == RECORD_TYPE
)
enum tree_code code
= PLUS_EXPR
;
tree binfo
= get_binfo (TREE_TYPE (type
), TREE_TYPE (intype
), 1);
if (binfo
== error_mark_node
)
binfo
= get_binfo (TREE_TYPE (intype
), TREE_TYPE (type
), 1);
if (binfo
== error_mark_node
)
if (TYPE_USES_VIRTUAL_BASECLASSES (TREE_TYPE (type
))
|| TYPE_USES_VIRTUAL_BASECLASSES (TREE_TYPE (intype
))
|| ! BINFO_OFFSET_ZEROP (binfo
))
/* Need to get the path we took. */
get_base_distance (TREE_TYPE (type
), TREE_TYPE (intype
), 0, &path
);
get_base_distance (TREE_TYPE (intype
), TREE_TYPE (type
), 0, &path
);
return build_vbase_path (code
, type
, expr
, path
, 0);
return build1 (NOP_EXPR
, type
, expr
);
my_friendly_assert (form
!= OFFSET_TYPE
, 186);
if (IS_AGGR_TYPE (intype
))
/* If we cannot convert to the specific pointer type,
try to convert to the type `void *'. */
rval
= build_type_conversion (CONVERT_EXPR
, type
, expr
, 1);
if (rval
== error_mark_node
)
error ("ambiguous pointer conversion");
return convert_to_pointer (type
, expr
);
/* Like convert, except permit conversions to take place which
are not normally allowed due to visibility restrictions
(such as conversion from sub-type to private super-type). */
convert_to_pointer_force (type
, expr
)
register tree intype
= TREE_TYPE (expr
);
register enum tree_code form
= TREE_CODE (intype
);
if (integer_zerop (expr
))
if (type
== TREE_TYPE (null_pointer_node
))
return null_pointer_node
;
expr
= build_int_2 (0, 0);
if (form
== POINTER_TYPE
)
intype
= TYPE_MAIN_VARIANT (intype
);
if (TYPE_MAIN_VARIANT (type
) != intype
&& TREE_CODE (TREE_TYPE (type
)) == RECORD_TYPE
&& TREE_CODE (TREE_TYPE (intype
)) == RECORD_TYPE
)
enum tree_code code
= PLUS_EXPR
;
int distance
= get_base_distance (TREE_TYPE (type
),
TREE_TYPE (intype
), 0, &path
);
error_with_aggr_type (TREE_TYPE (type
), "type `%s' is ambiguous baseclass of `%s'",
TYPE_NAME_STRING (TREE_TYPE (intype
)));
distance
= get_base_distance (TREE_TYPE (intype
),
TREE_TYPE (type
), 0, &path
);
/* Doesn't need any special help from us. */
return build1 (NOP_EXPR
, type
, expr
);
return build_vbase_path (code
, type
, expr
, path
, 0);
return build1 (NOP_EXPR
, type
, expr
);
return cp_convert_to_pointer (type
, expr
);
/* We are passing something to a function which requires a reference.
The type we are interested in is in TYPE. The initial
value we have to begin with is in ARG.
FLAGS controls how we manage visibility checking.
CHECKCONST controls if we report error messages on const subversion. */
build_up_reference (type
, arg
, flags
, checkconst
)
tree argtype
= TREE_TYPE (arg
), basetype
= argtype
;
tree target_type
= TREE_TYPE (type
);
my_friendly_assert (TREE_CODE (type
) == REFERENCE_TYPE
, 187);
&& TYPE_MAIN_VARIANT (argtype
) != TYPE_MAIN_VARIANT (target_type
)
&& IS_AGGR_TYPE (argtype
)
&& IS_AGGR_TYPE (target_type
))
binfo
= get_binfo (target_type
, argtype
,
(flags
& LOOKUP_PROTECTED_OK
) ? 3 : 2);
if ((flags
& LOOKUP_PROTECT
) && binfo
== error_mark_node
)
if (basetype
== NULL_TREE
)
return (tree
) error_not_base_type (target_type
, argtype
);
basetype
= BINFO_TYPE (binfo
);
/* Pass along const and volatile down into the type. */
if (TYPE_READONLY (type
) || TYPE_VOLATILE (type
))
target_type
= build_type_variant (target_type
, TYPE_READONLY (type
),
if (TREE_CODE (targ
) == SAVE_EXPR
)
targ
= TREE_OPERAND (targ
, 0);
switch (TREE_CODE (targ
))
/* This is a call to a constructor which did not know what it was
initializing until now: it needs to initialize a temporary. */
if (TREE_HAS_CONSTRUCTOR (targ
))
tree temp
= build_cplus_new (argtype
, TREE_OPERAND (targ
, 0), 1);
TREE_HAS_CONSTRUCTOR (targ
) = 0;
return build_up_reference (type
, temp
, flags
, 1);
/* Let &* cancel out to simplify resulting code.
Also, throw away intervening NOP_EXPRs. */
arg
= TREE_OPERAND (targ
, 0);
if (TREE_CODE (arg
) == NOP_EXPR
|| TREE_CODE (arg
) == NON_LVALUE_EXPR
|| (TREE_CODE (arg
) == CONVERT_EXPR
&& TREE_REFERENCE_EXPR (arg
)))
arg
= TREE_OPERAND (arg
, 0);
/* in doing a &*, we have to get rid of the const'ness on the pointer
value. Haven't thought about volatile here. Pointers come to mind
rval
= build1 (CONVERT_EXPR
, type
, arg
);
TREE_REFERENCE_EXPR (rval
) = 1;
/* propagate the const flag on something like:
class Derived : public Base {
void func2(const Derived& d) {
on the d parameter. The below could have been avoided, if the flags
were down in the tree, not sure why they are not. (mrs) */
/* The below code may have to be propagated to other parts of this
if (TREE_READONLY (targ
) && !TREE_READONLY (arg
)
&& (TREE_CODE (arg
) == PARM_DECL
|| TREE_CODE (arg
) == VAR_DECL
)
&& TREE_CODE (TREE_TYPE (arg
)) == REFERENCE_TYPE
&& (TYPE_READONLY (target_type
) && checkconst
))
TREE_READONLY (arg
) = TREE_READONLY (targ
);
literal_flag
= TREE_CONSTANT (arg
);
goto done_but_maybe_warn
;
/* Get this out of a register if we happened to be in one by accident.
Also, build up references to non-lvalues it we must. */
/* For &x[y], return (&) x+y */
if (mark_addressable (TREE_OPERAND (targ
, 0)) == 0)
rval
= build_binary_op (PLUS_EXPR
, TREE_OPERAND (targ
, 0),
TREE_OPERAND (targ
, 1), 1);
if (TREE_CONSTANT (TREE_OPERAND (targ
, 1))
&& staticp (TREE_OPERAND (targ
, 0)))
TREE_CONSTANT (rval
) = 1;
/* Could be a reference to a static member. */
tree field
= TREE_OPERAND (targ
, 1);
rval
= build1 (ADDR_EXPR
, type
, field
);
/* We should have farmed out member pointers above. */
rval
= build_component_addr (targ
, build_pointer_type (argtype
),
"attempt to make a reference to bit-field structure member `%s'");
literal_flag
= staticp (TREE_OPERAND (targ
, 0));
goto done_but_maybe_warn
;
/* Anything not already handled and not a true memory reference
needs to have a reference built up. Do so silently for
things like integers and return values from function,
but complain if we need a reference to something declared
TREE_ADDRESSABLE (targ
) = 1;
put_var_into_stack (targ
);
if (targ
== current_class_decl
)
error ("address of `this' not available");
/* This code makes the following core dump the compiler on a sun4,
if the code below is used.
void* append(a_ref& item);
a_decl::a_decl(e_decl *parent) {
parent->implementations.append(this);
TREE_ADDRESSABLE (targ
) = 1; /* so compiler doesn't die later */
put_var_into_stack (targ
);
if (DECL_REGISTER (targ
) && !TREE_ADDRESSABLE (targ
))
warning ("address needed to build reference for `%s', which is declared `register'",
IDENTIFIER_POINTER (DECL_NAME (targ
)));
TREE_ADDRESSABLE (targ
) = 1;
put_var_into_stack (targ
);
tree real_reference
= build_up_reference (type
, TREE_OPERAND (targ
, 1),
LOOKUP_PROTECT
, checkconst
);
rval
= build (COMPOUND_EXPR
, type
, TREE_OPERAND (targ
, 0), real_reference
);
TREE_CONSTANT (rval
) = staticp (TREE_OPERAND (targ
, 1));
tree real_reference
= build_up_reference (type
, TREE_OPERAND (targ
, 0),
LOOKUP_PROTECT
, checkconst
);
rval
= build (COMPOUND_EXPR
, type
, arg
, real_reference
);
TREE_CONSTANT (rval
) = staticp (TREE_OPERAND (targ
, 0));
return build (COND_EXPR
, type
,
build_up_reference (type
, TREE_OPERAND (targ
, 1),
LOOKUP_PROTECT
, checkconst
),
build_up_reference (type
, TREE_OPERAND (targ
, 2),
LOOKUP_PROTECT
, checkconst
));
return build (WITH_CLEANUP_EXPR
, type
,
build_up_reference (type
, TREE_OPERAND (targ
, 0),
LOOKUP_PROTECT
, checkconst
),
0, TREE_OPERAND (targ
, 2));
arg
= TREE_OPERAND (targ
, 1);
compiler_error ("({ ... }) expression not expanded when needed for reference");
rval
= build1 (ADDR_EXPR
, type
, arg
);
TREE_REFERENCE_EXPR (rval
) = 1;
if (TREE_ADDRESSABLE (targ
) == 0)
if (TREE_CODE (targ
) == CALL_EXPR
&& IS_AGGR_TYPE (argtype
))
temp
= build_cplus_new (argtype
, targ
, 1);
rval
= build1 (ADDR_EXPR
, type
, temp
);
temp
= get_temp_name (argtype
, 0);
if (global_bindings_p ())
/* Give this new temp some rtl and initialize it. */
DECL_INITIAL (temp
) = targ
;
finish_decl (temp
, targ
, NULL_TREE
, 0);
/* Do this after declaring it static. */
rval
= build_unary_op (ADDR_EXPR
, temp
, 0);
literal_flag
= TREE_CONSTANT (rval
);
rval
= build_unary_op (ADDR_EXPR
, temp
, 0);
/* Put a value into the rtl. */
if (IS_AGGR_TYPE (argtype
))
/* This may produce surprising results,
since we commit to initializing the temp
when the temp may not actually get used. */
expand_aggr_init (temp
, targ
, 0);
literal_flag
= TREE_CONSTANT (rval
);
if (binfo
&& !BINFO_OFFSET_ZEROP (binfo
))
rval
= convert_pointer_to (target_type
, rval
);
return build (COMPOUND_EXPR
, type
,
build (MODIFY_EXPR
, argtype
, temp
, arg
), rval
);
if (TREE_CODE (arg
) == SAVE_EXPR
)
rval
= build1 (ADDR_EXPR
, type
, arg
);
if (checkconst
&& TREE_READONLY (arg
) && ! TYPE_READONLY (target_type
))
readonly_error (arg
, "conversion to reference", 1);
if (TYPE_USES_COMPLEX_INHERITANCE (argtype
))
TREE_TYPE (rval
) = TYPE_POINTER_TO (argtype
);
rval
= convert_pointer_to (target_type
, rval
);
TREE_CONSTANT (rval
) = literal_flag
;
/* For C++: Only need to do one-level references, but cannot
get tripped up on signed/unsigned differences.
If DECL is NULL_TREE it means convert as though casting (by force).
If it is ERROR_MARK_NODE, it means the conversion is implicit,
and that temporaries may be created.
Make sure the use of user-defined conversion operators is un-ambiguous.
Otherwise, DECL is a _DECL node which can be used in error reporting.
FNDECL, PARMNUM, and ERRTYPE are only used when checking for use of
volatile or const references where they aren't desired. */
convert_to_reference (decl
, reftype
, expr
, fndecl
, parmnum
,
register tree type
= TYPE_MAIN_VARIANT (TREE_TYPE (reftype
));
register tree intype
= TREE_TYPE (expr
);
register enum tree_code form
= TREE_CODE (intype
);
if (form
== REFERENCE_TYPE
)
intype
= TREE_TYPE (intype
);
intype
= TYPE_MAIN_VARIANT (intype
);
/* @@ Probably need to have a check for X(X&) here. */
if (IS_AGGR_TYPE (intype
))
rval
= build_type_conversion (CONVERT_EXPR
, reftype
, expr
, 1);
if (rval
== error_mark_node
)
error ("ambiguous pointer conversion");
&& (rval
= build_type_conversion (CONVERT_EXPR
, type
, expr
, 1)))
if (rval
== error_mark_node
)
if (TYPE_NEEDS_DESTRUCTOR (type
))
rval
= convert_to_reference (NULL_TREE
, reftype
, rval
, NULL_TREE
,
-1, (char *)NULL
, strict
, flags
);
decl
= get_temp_name (type
, 0);
rval
= build (INIT_EXPR
, type
, decl
, rval
);
rval
= build (COMPOUND_EXPR
, reftype
, rval
,
convert_to_reference (NULL_TREE
, reftype
, decl
,
NULL_TREE
, -1, (char*)NULL
,
if (form
== REFERENCE_TYPE
&& TYPE_USES_COMPLEX_INHERITANCE (intype
))
/* If it may move around, build a fresh reference. */
expr
= convert_from_reference (expr
);
form
= TREE_CODE (TREE_TYPE (expr
));
/* @@ Perhaps this should try to go through a constructor first
@@ for proper initialization, but I am not sure when that
@@ is needed or desirable.
@@ The second disjunct is provided to make references behave
@@ as some people think they should, i.e., an interconvertibility
@@ between references to builtin types (such as short and
@@ unsigned short). There should be no conversion between
@@ types whose codes are different, or whose sizes are different. */
if (((IS_AGGR_TYPE (type
) || IS_AGGR_TYPE (intype
))
&& comptypes (type
, intype
, strict
))
&& TREE_CODE (type
) == TREE_CODE (intype
)
&& int_size_in_bytes (type
) == int_size_in_bytes (intype
)))
/* Since convert_for_initialization didn't call convert_for_assignment,
we have to do this checking here. XXX We should have a common
routine between here and convert_for_assignment. */
if (TREE_CODE (TREE_TYPE (expr
)) == REFERENCE_TYPE
)
register tree ttl
= TREE_TYPE (reftype
);
register tree ttr
= TREE_TYPE (TREE_TYPE (expr
));
if (! TYPE_READONLY (ttl
) && TYPE_READONLY (ttr
))
warn_for_assignment ("%s of non-`const &' reference from `const &'",
"reference to const given for argument %d of `%s'",
errtype
, fndecl
, parmnum
, pedantic
);
if (! TYPE_VOLATILE (ttl
) && TYPE_VOLATILE (ttr
))
warn_for_assignment ("%s of non-`volatile &' reference from `volatile &'",
"reference to volatile given for argument %d of `%s'",
errtype
, fndecl
, parmnum
, pedantic
);
/* If EXPR is of aggregate type, and is really a CALL_EXPR,
then we don't need to convert it to reference type if
it is only being used to initialize DECL which is also
of the same aggregate type. */
if (form
== REFERENCE_TYPE
|| (decl
!= NULL_TREE
&& decl
!= error_mark_node
&& TREE_CODE (expr
) == CALL_EXPR
&& TYPE_MAIN_VARIANT (type
) == intype
))
if (decl
&& decl
!= error_mark_node
)
tree e1
= build (INIT_EXPR
, void_type_node
, decl
, expr
);
TREE_SIDE_EFFECTS (e1
) = 1;
if (form
== REFERENCE_TYPE
)
e2
= build1 (NOP_EXPR
, reftype
, decl
);
e2
= build_unary_op (ADDR_EXPR
, decl
, 0);
TREE_TYPE (e2
) = reftype
;
TREE_REFERENCE_EXPR (e2
) = 1;
return build_compound_expr (tree_cons (NULL_TREE
, e1
,
build_tree_list (NULL_TREE
, e2
)));
TREE_TYPE (expr
) = reftype
;
if (decl
== error_mark_node
)
flags
|= LOOKUP_PROTECTED_OK
;
return build_up_reference (reftype
, expr
, flags
, decl
!=NULL_TREE
);
/* Definitely need to go through a constructor here. */
if (TYPE_HAS_CONSTRUCTOR (type
))
tree init
= build_method_call (NULL_TREE
, constructor_name (type
),
build_tree_list (NULL_TREE
, expr
),
TYPE_BINFO (type
), LOOKUP_NO_CONVERSION
);
if (init
!= error_mark_node
)
error ("both constructor and type conversion operator apply");
init
= build_method_call (NULL_TREE
, constructor_name (type
),
build_tree_list (NULL_TREE
, expr
),
TYPE_BINFO (type
), LOOKUP_NORMAL
|LOOKUP_NO_CONVERSION
);
if (init
== error_mark_node
)
rval
= build_cplus_new (type
, init
, 1);
if (decl
== error_mark_node
)
flags
|= LOOKUP_PROTECTED_OK
;
return build_up_reference (reftype
, rval
, flags
, decl
!=NULL_TREE
);
my_friendly_assert (form
!= OFFSET_TYPE
, 189);
/* This is in two pieces for now, because pointer to first becomes
invalid once type_as_string is called again. */
error ("cannot convert type `%s'", type_as_string (intype
));
error (" to type `%s'", type_as_string (reftype
));
/* We are using a reference VAL for its value. Bash that reference all the
way down to its lowest form. */
convert_from_reference (val
)
tree type
= TREE_TYPE (val
);
if (TREE_CODE (type
) == OFFSET_TYPE
)
if (TREE_CODE (type
) == REFERENCE_TYPE
)
tree target_type
= TREE_TYPE (type
);
/* This can happen if we cast to a reference type. */
if (TREE_CODE (val
) == ADDR_EXPR
)
nval
= build1 (NOP_EXPR
, build_pointer_type (target_type
), val
);
nval
= build_indirect_ref (nval
, 0);
/* The below was missing, are other important flags missing too? */
TREE_SIDE_EFFECTS (nval
) = TREE_SIDE_EFFECTS (val
);
nval
= build1 (INDIRECT_REF
, TYPE_MAIN_VARIANT (target_type
), val
);
TREE_THIS_VOLATILE (nval
) = TYPE_VOLATILE (target_type
);
TREE_SIDE_EFFECTS (nval
) = TYPE_VOLATILE (target_type
);
TREE_READONLY (nval
) = TYPE_READONLY (target_type
);
/* The below was missing, are other important flags missing too? */
TREE_SIDE_EFFECTS (nval
) = TREE_SIDE_EFFECTS (val
);
/* See if there is a constructor of type TYPE which will convert
EXPR. The reference manual seems to suggest (8.5.6) that we need
not worry about finding constructors for base classes, then converting
MSGP is a pointer to a message that would be an appropriate error
string. If MSGP is NULL, then we are not interested in reporting
convert_to_aggr (type
, expr
, msgp
, protect
)
tree name
= TYPE_IDENTIFIER (basetype
);
tree function
, fndecl
, fntype
, parmtypes
, parmlist
, result
;
enum visibility_type visibility
;
int can_be_private
, can_be_protected
;
if (! TYPE_HAS_CONSTRUCTOR (basetype
))
*msgp
= "type `%s' does not have a constructor";
visibility
= visibility_public
;
can_be_protected
= IDENTIFIER_CLASS_VALUE (name
) || name
== current_class_name
;
parmlist
= build_tree_list (NULL_TREE
, expr
);
parmtypes
= tree_cons (NULL_TREE
, TREE_TYPE (expr
), void_list_node
);
if (TYPE_USES_VIRTUAL_BASECLASSES (basetype
))
parmtypes
= tree_cons (NULL_TREE
, integer_type_node
, parmtypes
);
parmlist
= tree_cons (NULL_TREE
, integer_one_node
, parmlist
);
/* The type of the first argument will be filled in inside the loop. */
parmlist
= tree_cons (NULL_TREE
, integer_zero_node
, parmlist
);
parmtypes
= tree_cons (NULL_TREE
, TYPE_POINTER_TO (basetype
), parmtypes
);
method_name
= build_decl_overload (name
, parmtypes
, 1);
/* constructors are up front. */
fndecl
= TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype
), 0);
if (TYPE_HAS_DESTRUCTOR (basetype
))
fndecl
= DECL_CHAIN (fndecl
);
if (DECL_ASSEMBLER_NAME (fndecl
) == method_name
)
if (TREE_PRIVATE (fndecl
))
(basetype
== current_class_type
|| is_friend (basetype
, current_function_decl
)
|| purpose_member (basetype
, DECL_VISIBILITY (fndecl
)));
else if (TREE_PROTECTED (fndecl
))
fndecl
= DECL_CHAIN (fndecl
);
/* No exact conversion was found. See if an approximate
fndecl
= TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype
), 0);
if (TYPE_HAS_DESTRUCTOR (basetype
))
fndecl
= DECL_CHAIN (fndecl
);
struct candidate
*candidates
=
(struct candidate
*) alloca ((decl_list_length (fndecl
)+1) * sizeof (struct candidate
));
struct candidate
*cp
= candidates
;
cp
->harshness
= (unsigned short *)alloca (3 * sizeof (short));
compute_conversion_costs (fndecl
, parmlist
, cp
, 2);
if (TREE_PRIVATE (fndecl
))
visibility
= visibility_private
;
else if (TREE_PROTECTED (fndecl
))
visibility
= visibility_protected
;
visibility
= visibility_public
;
visibility
= visibility_public
;
if (visibility
== visibility_private
? (basetype
== current_class_type
|| is_friend (basetype
, cp
->function
)
|| purpose_member (basetype
, DECL_VISIBILITY (fndecl
)))
: visibility
== visibility_protected
|| purpose_member (basetype
, DECL_VISIBILITY (fndecl
)))
if (cp
->user
== 0 && cp
->b_or_d
== 0
if (visibility
== visibility_private
)
fndecl
= DECL_CHAIN (fndecl
);
/* Rank from worst to best. Then cp will point to best one.
Private fields have their bits flipped. For unsigned
numbers, this should make them look very large.
If the best alternate has a (signed) negative value,
then all we ever saw were private members. */
qsort (candidates
, /* char *base */
cp
- candidates
, /* int nel */
sizeof (struct candidate
), /* int width */
rank_for_overload
); /* int (*compar)() */
*msgp
= "ambiguous type conversion possible for `%s'";
*msgp
= "only private and protected conversions apply";
*msgp
= "only private conversions apply";
*msgp
= "only protected conversions apply";
if (msgp
) *msgp
= "no appropriate conversion to type `%s'";
if (visibility
== visibility_private
)
*msgp
= TREE_PRIVATE (fndecl
)
? "conversion to type `%s' is private"
: "conversion to type `%s' is from private base class";
if (visibility
== visibility_protected
)
*msgp
= TREE_PRIVATE (fndecl
)
? "conversion to type `%s' is protected"
: "conversion to type `%s' is from protected base class";
/* It will convert, but we don't do anything about it yet. */
fntype
= TREE_TYPE (function
);
if (DECL_INLINE (function
) && TREE_CODE (function
) == FUNCTION_DECL
)
function
= build1 (ADDR_EXPR
, build_pointer_type (fntype
), function
);
function
= default_conversion (function
);
result
= build_nt (CALL_EXPR
, function
,
convert_arguments (NULL_TREE
, TYPE_ARG_TYPES (fntype
),
parmlist
, NULL_TREE
, LOOKUP_NORMAL
),
TREE_TYPE (result
) = TREE_TYPE (fntype
);
TREE_SIDE_EFFECTS (result
) = 1;
TREE_RAISES (result
) = !! TYPE_RAISES_EXCEPTIONS (fntype
);
/* Call this when we know (for any reason) that expr is
convert_pointer_to (binfo
, expr
)
register tree intype
= TREE_TYPE (expr
);
if (TREE_CODE (binfo
) == TREE_VEC
)
type
= BINFO_TYPE (binfo
);
else if (IS_AGGR_TYPE (binfo
))
binfo
= TYPE_BINFO (binfo
);
ptr_type
= build_pointer_type (type
);
if (ptr_type
== TYPE_MAIN_VARIANT (intype
))
if (intype
== error_mark_node
)
my_friendly_assert (!integer_zerop (expr
), 191);
if (TREE_CODE (type
) == RECORD_TYPE
&& TREE_CODE (TREE_TYPE (intype
)) == RECORD_TYPE
&& type
!= TYPE_MAIN_VARIANT (TREE_TYPE (intype
)))
= get_base_distance (type
, TYPE_MAIN_VARIANT (TREE_TYPE (intype
)),
/* This function shouldn't be called with unqualified arguments
but if it is, give them an error message that they can read.
error ("cannot convert a pointer of type `%s'",
TYPE_NAME_STRING (TREE_TYPE (intype
)));
error_with_aggr_type (type
, "to a pointer of type `%s'");
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
);
/* Same as above, but don't abort if we get an "ambiguous" baseclass.
There's only one virtual baseclass we are looking for, and once
we find one such virtual baseclass, we have found them all. */
convert_pointer_to_vbase (binfo
, expr
)
tree intype
= TREE_TYPE (TREE_TYPE (expr
));
tree binfos
= TYPE_BINFO_BASETYPES (intype
);
for (i
= TREE_VEC_LENGTH (binfos
)-1; i
>= 0; i
--)
tree basetype
= BINFO_TYPE (TREE_VEC_ELT (binfos
, i
));
if (BINFO_TYPE (binfo
) == basetype
)
return convert_pointer_to (binfo
, expr
);
if (binfo_member (BINFO_TYPE (binfo
), CLASSTYPE_VBASECLASSES (basetype
)))
return convert_pointer_to_vbase (binfo
, convert_pointer_to (basetype
, expr
));
/* Create an expression whose value is that of EXPR,
converted to type TYPE. The TREE_TYPE of the value
is always TYPE. This function implements all reasonable
conversions; callers should filter out those that are
not permitted by the language being compiled. */
register enum tree_code code
= TREE_CODE (type
);
if (type
== TREE_TYPE (expr
)
|| TREE_CODE (expr
) == ERROR_MARK
)
if (TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (TREE_TYPE (expr
)))
return fold (build1 (NOP_EXPR
, type
, expr
));
if (TREE_CODE (TREE_TYPE (expr
)) == ERROR_MARK
)
if (TREE_CODE (TREE_TYPE (expr
)) == VOID_TYPE
)
error ("void value not ignored as it ought to be");
tree rval
= build_type_conversion (NOP_EXPR
, type
, e
, 0);
/* If we can convert to void type via a type conversion, do so. */
return build1 (CONVERT_EXPR
, type
, e
);
/* This is incorrect. A truncation can't be stripped this way.
Extensions will be stripped by the use of get_unwidened. */
if (TREE_CODE (expr
) == NOP_EXPR
)
return convert (type
, TREE_OPERAND (expr
, 0));
/* Just convert to the type of the member. */
if (code
== REFERENCE_TYPE
)
return fold (convert_to_reference (error_mark_node
,
NULL_TREE
, -1, (char *)NULL
,
else if (TREE_CODE (TREE_TYPE (e
)) == REFERENCE_TYPE
)
e
= convert_from_reference (e
);
if (code
== INTEGER_TYPE
|| code
== ENUMERAL_TYPE
)
tree intype
= TREE_TYPE (expr
);
enum tree_code form
= TREE_CODE (intype
);
if (flag_int_enum_equivalence
== 0
&& TREE_CODE (type
) == ENUMERAL_TYPE
pedwarn ("anachronistic conversion from integer type to enumeral type `%s'",
TYPE_NAME_STRING (type
));
if (flag_pedantic_errors
)
error_with_decl (TYPE_NAME (TYPE_OFFSET_BASETYPE (intype
)),
"pointer-to-member expression object not composed with type `%s' object");
else if (IS_AGGR_TYPE (intype
))
rval
= build_type_conversion (CONVERT_EXPR
, type
, expr
, 1);
error ("aggregate value used where an integer was expected");
return fold (convert_to_integer (type
, e
));
if (code
== POINTER_TYPE
)
return fold (cp_convert_to_pointer (type
, e
));
if (IS_AGGR_TYPE (TREE_TYPE (e
)))
rval
= build_type_conversion (CONVERT_EXPR
, type
, e
, 1);
error ("aggregate value used where a floating point value was expected");
return fold (convert_to_real (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 (IS_AGGR_TYPE_CODE (code
))
tree dtype
= TREE_TYPE (e
);
if (TREE_CODE (dtype
) == REFERENCE_TYPE
)
e
= convert_from_reference (e
);
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. */
if (IS_AGGR_TYPE (dtype
))
tree conversion
= TYPE_HAS_CONVERSION (dtype
)
? build_type_conversion (CONVERT_EXPR
, type
, e
, 1) : NULL_TREE
;
if (TYPE_HAS_CONSTRUCTOR (type
))
tree rval
= build_method_call (NULL_TREE
, constructor_name (type
),
build_tree_list (NULL_TREE
, e
),
conversion
? LOOKUP_NO_CONVERSION
: 0);
if (rval
!= error_mark_node
)
error ("both constructor and type conversion operator apply");
/* call to constructor successful. */
rval
= build_cplus_new (type
, rval
, 0);
/* Type conversion successful/applies. */
if (conversion
== error_mark_node
)
error ("ambiguous pointer conversion");
/* now try normal C++ assignment semantics. */
binfo
= TYPE_BINFO (dtype
);
if (BINFO_TYPE (binfo
) == type
|| (binfo
= get_binfo (type
, dtype
, 1)))
if (binfo
== error_mark_node
)
e
= build_unary_op (ADDR_EXPR
, e
, 0);
if (! BINFO_OFFSET_ZEROP (binfo
))
e
= build (PLUS_EXPR
, TYPE_POINTER_TO (type
),
e
, BINFO_OFFSET (binfo
));
return build1 (INDIRECT_REF
, type
, e
);
sorry ("addressable aggregates");
error ("conversion between incompatible aggregate types requested");
/* conversion from non-aggregate to aggregate type requires constructor. */
else if (TYPE_HAS_CONSTRUCTOR (type
))
tree init
= build_method_call (NULL_TREE
, constructor_name (type
),
build_tree_list (NULL_TREE
, e
),
TYPE_BINFO (type
), LOOKUP_NORMAL
);
if (init
== error_mark_node
)
error_with_aggr_type (type
, "in conversion to type `%s'");
rval
= build_cplus_new (type
, init
, 0);
/* If TYPE or TREE_TYPE (EXPR) is not on the permanent_obstack,
then the it won't be hashed and hence compare as not equal,
&& TREE_TYPE (TREE_TYPE (expr
)) == TREE_TYPE (type
)
&& index_type_equal (TYPE_DOMAIN (TREE_TYPE (expr
)), TYPE_DOMAIN (type
)))
error ("conversion to non-scalar type requested");
/* Like convert, except permit conversions to take place which
are not normally allowed due to visibility restrictions
(such as conversion from sub-type to private super-type). */
convert_force (type
, expr
)
register enum tree_code code
= TREE_CODE (type
);
if (code
== REFERENCE_TYPE
)
return fold (convert_to_reference (0, type
, e
,
NULL_TREE
, -1, (char *)NULL
,
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
));
int old_equiv
= flag_int_enum_equivalence
;
flag_int_enum_equivalence
= 1;
flag_int_enum_equivalence
= old_equiv
;
/* Subroutine of build_type_conversion. */
build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
)
first_arg
= build1 (NOP_EXPR
, TYPE_POINTER_TO (basetype
), integer_zero_node
);
rval
= build_method_call (first_arg
, constructor_name (typename
),
NULL_TREE
, NULL_TREE
, flags
);
if (rval
== error_mark_node
)
expr
= build_up_reference (build_reference_type (TREE_TYPE (expr
)), expr
,
TREE_VALUE (TREE_OPERAND (rval
, 1)) = build_unary_op (ADDR_EXPR
, expr
, 0);
if (TREE_CODE (TREE_TYPE (rval
)) == REFERENCE_TYPE
&& TREE_CODE (xtype
) != REFERENCE_TYPE
)
rval
= default_conversion (rval
);
&& (TREE_READONLY (TREE_TYPE (TREE_TYPE (rval
)))
> TREE_READONLY (TREE_TYPE (xtype
))))
pedwarn ("user-defined conversion casting away `const'");
return convert (xtype
, rval
);
/* Convert an aggregate EXPR to type XTYPE. If a conversion
exists, return the attempted conversion. This may
return ERROR_MARK_NODE if the conversion is not
allowed (references private members, etc).
If no conversion exists, NULL_TREE is returned.
If (FOR_SURE & 1) is non-zero, then we allow this type conversion
to take place immediately. Otherwise, we build a SAVE_EXPR
which can be evaluated if the results are ever needed.
If FOR_SURE >= 2, then we only look for exact conversions.
TYPE may be a reference type, in which case we first look
for something that will convert to a reference type. If
that fails, we will try to look for something of the
reference's target type, and then return a reference to that. */
build_type_conversion (code
, xtype
, expr
, for_sure
)
/* C++: check to see if we can convert this aggregate type
into the required scalar type. */
tree typename
= build_typename_overload (xtype
), *typenames
;
tree basetype
, save_basetype
;
int exact_conversion
= for_sure
>= 2;
if (expr
== error_mark_node
)
basetype
= TREE_TYPE (expr
);
if (TREE_CODE (basetype
) == REFERENCE_TYPE
)
basetype
= TREE_TYPE (basetype
);
basetype
= TYPE_MAIN_VARIANT (basetype
);
if (! TYPE_LANG_SPECIFIC (basetype
) || ! TYPE_HAS_CONVERSION (basetype
))
if (TREE_CODE (xtype
) == POINTER_TYPE
|| TREE_CODE (xtype
) == REFERENCE_TYPE
)
/* Prepare to match a variant of this type. */
type
= TYPE_MAIN_VARIANT (TREE_TYPE (xtype
));
for (n_variants
= 0; type
; type
= TYPE_NEXT_VARIANT (type
))
typenames
= (tree
*)alloca (n_variants
* sizeof (tree
));
for (n_variants
= 0, type
= TYPE_MAIN_VARIANT (TREE_TYPE (xtype
));
type
; n_variants
++, type
= TYPE_NEXT_VARIANT (type
))
if (type
== TREE_TYPE (xtype
))
typenames
[n_variants
] = typename
;
else if (TREE_CODE (xtype
) == POINTER_TYPE
)
typenames
[n_variants
] = build_typename_overload (build_pointer_type (type
));
typenames
[n_variants
] = build_typename_overload (build_reference_type (type
));
save_basetype
= basetype
;
while (TYPE_HAS_CONVERSION (basetype
))
if (lookup_fnfields (TYPE_BINFO (basetype
), typename
, 0))
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
for (i
= 0; i
< n_variants
; i
++)
if (typenames
[i
] != typename
&& lookup_fnfields (TYPE_BINFO (basetype
), typenames
[i
], 0))
return build_type_conversion_1 (xtype
, basetype
, expr
, typenames
[i
], for_sure
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
if (TREE_CODE (type
) == REFERENCE_TYPE
)
type
= TYPE_MAIN_VARIANT (TREE_TYPE (type
));
basetype
= save_basetype
;
/* May need to build a temporary for this. */
while (TYPE_HAS_CONVERSION (basetype
))
if (lookup_fnfields (TYPE_BINFO (basetype
), typename
, 0))
first_arg
= build1 (NOP_EXPR
, TYPE_POINTER_TO (basetype
), integer_zero_node
);
rval
= build_method_call (first_arg
, constructor_name (typename
),
NULL_TREE
, NULL_TREE
, flags
);
if (rval
== error_mark_node
)
TREE_VALUE (TREE_OPERAND (rval
, 1)) = expr
;
tree init
= build_method_call (NULL_TREE
,
build_tree_list (NULL_TREE
, rval
), NULL_TREE
, LOOKUP_NORMAL
);
tree temp
= build_cplus_new (type
, init
, 1);
return build_up_reference (TYPE_REFERENCE_TO (type
), temp
,
return convert (xtype
, rval
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
/* No free conversions for reference types, right?. */
/* No perfect match found, try default. */
if (code
== CONVERT_EXPR
&& TREE_CODE (type
) == POINTER_TYPE
)
type_default
= ptr_type_node
;
else if (type
== void_type_node
)
tree tmp
= default_conversion (build1 (NOP_EXPR
, type
, integer_zero_node
));
if (tmp
== error_mark_node
)
type_default
= TREE_TYPE (tmp
);
basetype
= save_basetype
;
if (type_default
!= type
)
typename
= build_typename_overload (type
);
while (TYPE_HAS_CONVERSION (basetype
))
if (lookup_fnfields (TYPE_BINFO (basetype
), typename
, 0))
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
if (type
== ptr_type_node
)
/* Try converting to some other pointer type
with which void* is compatible, or in situations
in which void* is appropriate (such as &&,||, and !). */
while (TYPE_HAS_CONVERSION (basetype
))
if (CLASSTYPE_CONVERSION (basetype
, ptr_conv
) != 0)
if (CLASSTYPE_CONVERSION (basetype
, ptr_conv
) == error_mark_node
)
typename
= DECL_NAME (CLASSTYPE_CONVERSION (basetype
, ptr_conv
));
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
if (TREE_CODE (type
) == POINTER_TYPE
&& TYPE_READONLY (TREE_TYPE (type
))
&& TYPE_MAIN_VARIANT (TREE_TYPE (type
)) == void_type_node
)
/* Try converting to some other pointer type
with which const void* is compatible. */
while (TYPE_HAS_CONVERSION (basetype
))
if (CLASSTYPE_CONVERSION (basetype
, constptr_conv
) != 0)
if (CLASSTYPE_CONVERSION (basetype
, constptr_conv
) == error_mark_node
)
typename
= DECL_NAME (CLASSTYPE_CONVERSION (basetype
, constptr_conv
));
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
/* Use the longer or shorter conversion that is appropriate. Have
to check against 0 because the conversion may come from a baseclass. */
if (TREE_CODE (type
) == INTEGER_TYPE
&& TYPE_HAS_INT_CONVERSION (basetype
)
&& CLASSTYPE_CONVERSION (basetype
, int_conv
) != 0
&& CLASSTYPE_CONVERSION (basetype
, int_conv
) != error_mark_node
)
typename
= DECL_NAME (CLASSTYPE_CONVERSION (basetype
, int_conv
));
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TREE_CODE (type
) == REAL_TYPE
&& TYPE_HAS_REAL_CONVERSION (basetype
)
&& CLASSTYPE_CONVERSION (basetype
, real_conv
) != 0
&& CLASSTYPE_CONVERSION (basetype
, real_conv
) != error_mark_node
)
typename
= DECL_NAME (CLASSTYPE_CONVERSION (basetype
, real_conv
));
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TREE_CODE (type
) != POINTER_TYPE
&& (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
|| code
== TRUTH_NOT_EXPR
))
/* Here's when we can convert to a pointer. */
/* THESE ARE TOTAL KLUDGES. */
/* Default promotion yields no new alternatives, try
conversions which are anti-default, such as
double -> float or int -> unsigned or unsigned -> long
&& (TREE_CODE (type
) == INTEGER_TYPE
|| TREE_CODE (type
) == REAL_TYPE
))
if (type
== double_type_node
)
typename
= build_typename_overload (float_type_node
);
else if (type
== integer_type_node
)
typename
= build_typename_overload (unsigned_type_node
);
else if (type
== unsigned_type_node
)
typename
= build_typename_overload (long_integer_type_node
);
basetype
= save_basetype
;
while (TYPE_HAS_CONVERSION (basetype
))
if (lookup_fnfields (TYPE_BINFO (basetype
), typename
, 0))
return build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
if (type
== integer_type_node
)
typename
= build_typename_overload (long_integer_type_node
);
typename
= build_typename_overload (integer_type_node
);
/* Now, try C promotions...
Truthvalue conversions let us try to convert
to pointer if we were going for int, and to int
if we were looking for pointer. */
basetype
= save_basetype
;
if (TREE_CODE (type
) == REAL_TYPE
|| (TREE_CODE (type
) == POINTER_TYPE
&& (code
== TRUTH_ANDIF_EXPR
|| code
== TRUTH_ORIF_EXPR
|| code
== TRUTH_NOT_EXPR
)))
type
= integer_type_node
;
else if (TREE_CODE (type
) == INTEGER_TYPE
)
if (TYPE_HAS_REAL_CONVERSION (basetype
))
typename
= build_typename_overload (type
);
while (TYPE_HAS_CONVERSION (basetype
))
if (lookup_fnfields (TYPE_BINFO (basetype
), typename
, 0))
rval
= build_type_conversion_1 (xtype
, basetype
, expr
, typename
, for_sure
);
if (TYPE_BINFO_BASETYPES (basetype
))
basetype
= TYPE_BINFO_BASETYPE (basetype
, 0);
/* Must convert two aggregate types to non-aggregate type.
Attempts to find a non-ambiguous, "best" type conversion.
Return 1 on success, 0 on failure.
@@ What are the real semantics of this supposed to be??? */
build_default_binary_type_conversion (code
, arg1
, arg2
)
tree type1
= TREE_TYPE (*arg1
);
tree type2
= TREE_TYPE (*arg2
);
if (TREE_CODE (type1
) == REFERENCE_TYPE
)
type1
= TREE_TYPE (type1
);
if (TREE_CODE (type2
) == REFERENCE_TYPE
)
type2
= TREE_TYPE (type2
);
if (TREE_CODE (TYPE_NAME (type1
)) != TYPE_DECL
)
tree decl
= typedecl_for_tag (type1
);
error ("type conversion nonexistent for type `%s'",
IDENTIFIER_POINTER (DECL_NAME (decl
)));
error ("type conversion nonexistent for non-C++ type");
if (TREE_CODE (TYPE_NAME (type2
)) != TYPE_DECL
)
tree decl
= typedecl_for_tag (type2
);
error ("type conversion nonexistent for type `%s'",
IDENTIFIER_POINTER (decl
));
error ("type conversion nonexistent for non-C++ type");
name1
= TYPE_NAME_STRING (type1
);
name2
= TYPE_NAME_STRING (type2
);
if (!IS_AGGR_TYPE (type1
) || !TYPE_HAS_CONVERSION (type1
))
if (!IS_AGGR_TYPE (type2
) || !TYPE_HAS_CONVERSION (type2
))
error ("type conversion required for binary operation on types `%s' and `%s'",
error ("type conversion required for type `%s'", name1
);
else if (!IS_AGGR_TYPE (type2
) || !TYPE_HAS_CONVERSION (type2
))
error ("type conversion required for type `%s'", name2
);
if (TYPE_HAS_INT_CONVERSION (type1
) && TYPE_HAS_REAL_CONVERSION (type1
))
warning ("ambiguous type conversion for type `%s', defaulting to int", name1
);
if (TYPE_HAS_INT_CONVERSION (type1
))
*arg1
= build_type_conversion (code
, integer_type_node
, *arg1
, 1);
*arg2
= build_type_conversion (code
, integer_type_node
, *arg2
, 1);
else if (TYPE_HAS_REAL_CONVERSION (type1
))
*arg1
= build_type_conversion (code
, double_type_node
, *arg1
, 1);
*arg2
= build_type_conversion (code
, double_type_node
, *arg2
, 1);
*arg1
= build_type_conversion (code
, ptr_type_node
, *arg1
, 1);
if (*arg1
== error_mark_node
)
error ("ambiguous pointer conversion");
*arg2
= build_type_conversion (code
, ptr_type_node
, *arg2
, 1);
if (*arg1
!= error_mark_node
&& *arg2
== error_mark_node
)
error ("ambiguous pointer conversion");
if (*arg2
== 0 && type1
!= type2
)
error ("default type conversion for types `%s' and `%s' failed",
error ("default type conversion for type `%s' failed", name1
);
error ("default type conversion for type `%s' failed", name2
);
/* Must convert two aggregate types to non-aggregate type.
Attempts to find a non-ambiguous, "best" type conversion.
Return 1 on success, 0 on failure.
The type of the argument is expected to be of aggregate type here.
@@ What are the real semantics of this supposed to be??? */
build_default_unary_type_conversion (code
, arg
)
tree type
= TREE_TYPE (*arg
);
tree id
= TREE_CODE (TYPE_NAME (type
)) == TYPE_DECL
? TYPE_IDENTIFIER (type
) : TYPE_NAME (type
);
char *name
= IDENTIFIER_POINTER (id
);
if (! TYPE_HAS_CONVERSION (type
))
error ("type conversion required for type `%s'", name
);
if (TYPE_HAS_INT_CONVERSION (type
) && TYPE_HAS_REAL_CONVERSION (type
))
warning ("ambiguous type conversion for type `%s', defaulting to int", name
);
if (TYPE_HAS_INT_CONVERSION (type
))
*arg
= build_type_conversion (code
, integer_type_node
, *arg
, 1);
else if (TYPE_HAS_REAL_CONVERSION (type
))
*arg
= build_type_conversion (code
, double_type_node
, *arg
, 1);
*arg
= build_type_conversion (code
, ptr_type_node
, *arg
, 1);
if (*arg
== error_mark_node
)
error ("ambiguous pointer conversion");
error ("default type conversion for type `%s' failed", name
);