a4cd5630b0
non-i386, non-unix, and generatable files have been trimmed, but can easily be added in later if needed. gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's handy to have both available for reference for such little cost. The freebsd-specific changes will then be committed, and once the dust has settled, the bmakefiles will be committed to use this code.
1821 lines
51 KiB
C
1821 lines
51 KiB
C
/* Language-level data type conversion for GNU C++.
|
||
Copyright (C) 1987, 88, 92, 93, 94, 1995 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)
|
||
any later version.
|
||
|
||
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, 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, 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. */
|
||
|
||
#include "config.h"
|
||
#include "tree.h"
|
||
#include "flags.h"
|
||
#include "cp-tree.h"
|
||
#include "class.h"
|
||
#include "convert.h"
|
||
|
||
#undef NULL
|
||
#define NULL (char *)0
|
||
|
||
/* 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 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 fold-const.c: fold.
|
||
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'. */
|
||
|
||
/* Build a thunk. What it is, is an entry point that when called will
|
||
adjust the this pointer (the first argument) by offset, and then
|
||
goto the real address of the function given by REAL_ADDR that we
|
||
would like called. What we return is the address of the thunk. */
|
||
static tree
|
||
build_thunk (offset, real_addr)
|
||
tree offset, real_addr;
|
||
{
|
||
if (TREE_CODE (real_addr) != ADDR_EXPR
|
||
|| TREE_CODE (TREE_OPERAND (real_addr, 0)) != FUNCTION_DECL)
|
||
{
|
||
sorry ("MI pointer to member conversion too complex");
|
||
return error_mark_node;
|
||
}
|
||
sorry ("MI pointer to member conversion too complex");
|
||
return error_mark_node;
|
||
}
|
||
|
||
/* Convert a `pointer to member' (POINTER_TYPE to METHOD_TYPE) into
|
||
another `pointer to method'. This may involved the creation of
|
||
a thunk to handle the this offset calculation. */
|
||
static tree
|
||
convert_fn_ptr (type, expr)
|
||
tree type, expr;
|
||
{
|
||
if (flag_vtable_thunks)
|
||
{
|
||
tree intype = TREE_TYPE (expr);
|
||
tree binfo = get_binfo (TYPE_METHOD_BASETYPE (TREE_TYPE (intype)),
|
||
TYPE_METHOD_BASETYPE (TREE_TYPE (type)), 1);
|
||
if (binfo == error_mark_node)
|
||
{
|
||
error (" in pointer to member conversion");
|
||
return error_mark_node;
|
||
}
|
||
if (binfo == NULL_TREE)
|
||
{
|
||
/* ARM 4.8 restriction. */
|
||
error ("invalid pointer to member conversion");
|
||
return error_mark_node;
|
||
}
|
||
|
||
if (BINFO_OFFSET_ZEROP (binfo))
|
||
return build1 (NOP_EXPR, type, expr);
|
||
return build1 (NOP_EXPR, type, build_thunk (BINFO_OFFSET (binfo), expr));
|
||
}
|
||
else
|
||
return build_ptrmemfunc (type, expr, 1);
|
||
}
|
||
|
||
/* if converting pointer to pointer
|
||
if dealing with classes, check for derived->base or vice versa
|
||
else if dealing with method pointers, delegate
|
||
else convert blindly
|
||
else if converting class, pass off to build_type_conversion
|
||
else try C-style pointer conversion */
|
||
static tree
|
||
cp_convert_to_pointer (type, expr)
|
||
tree type, expr;
|
||
{
|
||
register tree intype = TREE_TYPE (expr);
|
||
register enum tree_code form;
|
||
|
||
if (TYPE_PTRMEMFUNC_P (type))
|
||
type = TYPE_PTRMEMFUNC_FN_TYPE (type);
|
||
if (TYPE_PTRMEMFUNC_P (intype))
|
||
intype = TYPE_PTRMEMFUNC_FN_TYPE (intype);
|
||
|
||
form = TREE_CODE (intype);
|
||
|
||
if (form == POINTER_TYPE || form == REFERENCE_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)
|
||
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))
|
||
{
|
||
/* Need to get the path we took. */
|
||
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 (TREE_CODE (TREE_TYPE (intype)) == METHOD_TYPE
|
||
&& TREE_CODE (type) == POINTER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE)
|
||
return convert_fn_ptr (type, expr);
|
||
|
||
if (TREE_CODE (TREE_TYPE (type)) == OFFSET_TYPE
|
||
&& TREE_CODE (TREE_TYPE (intype)) == OFFSET_TYPE)
|
||
{
|
||
tree b1 = TYPE_OFFSET_BASETYPE (TREE_TYPE (type));
|
||
tree b2 = TYPE_OFFSET_BASETYPE (TREE_TYPE (intype));
|
||
tree binfo = get_binfo (b1, b2, 1);
|
||
if (binfo == NULL_TREE)
|
||
binfo = get_binfo (b2, b1, 1);
|
||
if (binfo == error_mark_node)
|
||
return error_mark_node;
|
||
}
|
||
|
||
if (TREE_CODE (TREE_TYPE (intype)) == METHOD_TYPE
|
||
|| (TREE_CODE (type) == POINTER_TYPE
|
||
&& TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE))
|
||
{
|
||
cp_error ("cannot convert `%E' from type `%T' to type `%T'",
|
||
expr, intype, type);
|
||
return error_mark_node;
|
||
}
|
||
|
||
return build1 (NOP_EXPR, type, expr);
|
||
}
|
||
|
||
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 (IS_AGGR_TYPE (intype))
|
||
{
|
||
tree rval;
|
||
rval = build_type_conversion (CONVERT_EXPR, 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 (integer_zerop (expr))
|
||
{
|
||
if (type == TREE_TYPE (null_pointer_node))
|
||
return null_pointer_node;
|
||
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 = convert (type_for_size (POINTER_SIZE, 0), expr);
|
||
/* Modes may be different but sizes should be the same. */
|
||
if (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (expr)))
|
||
!= GET_MODE_SIZE (TYPE_MODE (type)))
|
||
/* There is supposed to be some integral type
|
||
that is the same width as a pointer. */
|
||
abort ();
|
||
return convert_to_pointer (type, expr);
|
||
}
|
||
|
||
cp_error ("cannot convert `%E' from type `%T' to type `%T'",
|
||
expr, intype, type);
|
||
return error_mark_node;
|
||
}
|
||
|
||
/* Like convert, except permit conversions to take place which
|
||
are not normally allowed due to access restrictions
|
||
(such as conversion from sub-type to private super-type). */
|
||
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))
|
||
{
|
||
if (type == TREE_TYPE (null_pointer_node))
|
||
return null_pointer_node;
|
||
expr = build_int_2 (0, 0);
|
||
TREE_TYPE (expr) = type;
|
||
return expr;
|
||
}
|
||
|
||
/* Convert signature pointer/reference to `void *' first. */
|
||
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
|
||
&& 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)
|
||
/* Doesn't need any special help from us. */
|
||
return build1 (NOP_EXPR, type, expr);
|
||
|
||
code = MINUS_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 access checking.
|
||
CHECKCONST controls if we report error messages on const subversion. */
|
||
static tree
|
||
build_up_reference (type, arg, flags, checkconst)
|
||
tree type, arg;
|
||
int flags, checkconst;
|
||
{
|
||
tree rval, targ;
|
||
int literal_flag = 0;
|
||
tree argtype = TREE_TYPE (arg);
|
||
tree target_type = TREE_TYPE (type);
|
||
tree binfo = NULL_TREE;
|
||
|
||
my_friendly_assert (TREE_CODE (type) == REFERENCE_TYPE, 187);
|
||
if ((flags & LOOKUP_PROTECT)
|
||
&& TYPE_MAIN_VARIANT (argtype) != TYPE_MAIN_VARIANT (target_type)
|
||
&& IS_AGGR_TYPE (argtype)
|
||
&& IS_AGGR_TYPE (target_type))
|
||
{
|
||
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);
|
||
}
|
||
|
||
/* Pass along const and volatile down into the type. */
|
||
if (TYPE_READONLY (type) || TYPE_VOLATILE (type))
|
||
target_type = cp_build_type_variant (target_type, TYPE_READONLY (type),
|
||
TYPE_VOLATILE (type));
|
||
targ = arg;
|
||
if (TREE_CODE (targ) == SAVE_EXPR)
|
||
targ = TREE_OPERAND (targ, 0);
|
||
while (TREE_CODE (targ) == NOP_EXPR
|
||
&& (TYPE_MAIN_VARIANT (argtype)
|
||
== TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (targ, 0)))))
|
||
targ = TREE_OPERAND (targ, 0);
|
||
|
||
switch (TREE_CODE (targ))
|
||
{
|
||
case INDIRECT_REF:
|
||
/* 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
|
||
here. */
|
||
if (TREE_READONLY (arg))
|
||
{
|
||
arg = copy_node (arg);
|
||
TREE_READONLY (arg) = 0;
|
||
}
|
||
|
||
rval = build1 (CONVERT_EXPR, type, arg);
|
||
TREE_REFERENCE_EXPR (rval) = 1;
|
||
|
||
/* propagate the const flag on something like:
|
||
|
||
class Base {
|
||
public:
|
||
int foo;
|
||
};
|
||
|
||
class Derived : public Base {
|
||
public:
|
||
int bar;
|
||
};
|
||
|
||
void func(Base&);
|
||
|
||
void func2(const Derived& d) {
|
||
func(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
|
||
switch. */
|
||
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))
|
||
{
|
||
arg = copy_node (arg);
|
||
TREE_READONLY (arg) = TREE_READONLY (targ);
|
||
}
|
||
literal_flag = TREE_CONSTANT (arg);
|
||
|
||
goto done;
|
||
|
||
/* 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 */
|
||
case ARRAY_REF:
|
||
if (mark_addressable (TREE_OPERAND (targ, 0)) == 0)
|
||
return error_mark_node;
|
||
rval = build_binary_op (PLUS_EXPR, TREE_OPERAND (targ, 0),
|
||
TREE_OPERAND (targ, 1), 1);
|
||
TREE_TYPE (rval) = type;
|
||
if (TREE_CONSTANT (TREE_OPERAND (targ, 1))
|
||
&& staticp (TREE_OPERAND (targ, 0)))
|
||
TREE_CONSTANT (rval) = 1;
|
||
goto done;
|
||
|
||
case SCOPE_REF:
|
||
/* Could be a reference to a static member. */
|
||
{
|
||
tree field = TREE_OPERAND (targ, 1);
|
||
if (TREE_STATIC (field))
|
||
{
|
||
rval = build1 (ADDR_EXPR, type, field);
|
||
literal_flag = 1;
|
||
goto done;
|
||
}
|
||
}
|
||
|
||
/* We should have farmed out member pointers above. */
|
||
my_friendly_abort (188);
|
||
|
||
case COMPONENT_REF:
|
||
rval = build_component_addr (targ, build_pointer_type (argtype),
|
||
"attempt to make a reference to bit-field structure member `%s'");
|
||
TREE_TYPE (rval) = type;
|
||
literal_flag = staticp (TREE_OPERAND (targ, 0));
|
||
|
||
goto done;
|
||
|
||
/* 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
|
||
as `register'. */
|
||
|
||
case RESULT_DECL:
|
||
if (staticp (targ))
|
||
literal_flag = 1;
|
||
TREE_ADDRESSABLE (targ) = 1;
|
||
put_var_into_stack (targ);
|
||
break;
|
||
|
||
case PARM_DECL:
|
||
#if 0
|
||
if (targ == current_class_decl)
|
||
{
|
||
error ("address of `this' not available");
|
||
/* #if 0 */
|
||
/* This code makes the following core dump the compiler on a sun4,
|
||
if the code below is used.
|
||
|
||
class e_decl;
|
||
class a_decl;
|
||
typedef a_decl* a_ref;
|
||
|
||
class a_s {
|
||
public:
|
||
a_s();
|
||
void* append(a_ref& item);
|
||
};
|
||
class a_decl {
|
||
public:
|
||
a_decl (e_decl *parent);
|
||
a_s generic_s;
|
||
a_s decls;
|
||
e_decl* parent;
|
||
};
|
||
|
||
class e_decl {
|
||
public:
|
||
e_decl();
|
||
a_s implementations;
|
||
};
|
||
|
||
void foobar(void *);
|
||
|
||
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);
|
||
break;
|
||
/* #else */
|
||
return error_mark_node;
|
||
/* #endif */
|
||
}
|
||
#endif
|
||
/* Fall through. */
|
||
case VAR_DECL:
|
||
case CONST_DECL:
|
||
if (DECL_REGISTER (targ) && !TREE_ADDRESSABLE (targ)
|
||
&& !DECL_ARTIFICIAL (targ))
|
||
cp_warning ("address needed to build reference for `%D', which is declared `register'",
|
||
targ);
|
||
else if (staticp (targ))
|
||
literal_flag = 1;
|
||
|
||
TREE_ADDRESSABLE (targ) = 1;
|
||
put_var_into_stack (targ);
|
||
break;
|
||
|
||
case COMPOUND_EXPR:
|
||
{
|
||
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));
|
||
return rval;
|
||
}
|
||
|
||
case PREINCREMENT_EXPR:
|
||
case PREDECREMENT_EXPR:
|
||
case MODIFY_EXPR:
|
||
case INIT_EXPR:
|
||
{
|
||
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 rval;
|
||
}
|
||
|
||
case COND_EXPR:
|
||
return build (COND_EXPR, type,
|
||
TREE_OPERAND (targ, 0),
|
||
build_up_reference (type, TREE_OPERAND (targ, 1),
|
||
LOOKUP_PROTECT, checkconst),
|
||
build_up_reference (type, TREE_OPERAND (targ, 2),
|
||
LOOKUP_PROTECT, checkconst));
|
||
|
||
/* Undo the folding... */
|
||
case MIN_EXPR:
|
||
case MAX_EXPR:
|
||
return build (COND_EXPR, type,
|
||
build (TREE_CODE (targ) == MIN_EXPR ? LT_EXPR : GT_EXPR,
|
||
boolean_type_node, TREE_OPERAND (targ, 0),
|
||
TREE_OPERAND (targ, 1)),
|
||
build_up_reference (type, TREE_OPERAND (targ, 0),
|
||
LOOKUP_PROTECT, checkconst),
|
||
build_up_reference (type, TREE_OPERAND (targ, 1),
|
||
LOOKUP_PROTECT, checkconst));
|
||
|
||
case WITH_CLEANUP_EXPR:
|
||
return build (WITH_CLEANUP_EXPR, type,
|
||
build_up_reference (type, TREE_OPERAND (targ, 0),
|
||
LOOKUP_PROTECT, checkconst),
|
||
0, TREE_OPERAND (targ, 2));
|
||
|
||
case BIND_EXPR:
|
||
arg = TREE_OPERAND (targ, 1);
|
||
if (arg == NULL_TREE)
|
||
{
|
||
compiler_error ("({ ... }) expression not expanded when needed for reference");
|
||
return error_mark_node;
|
||
}
|
||
rval = build1 (ADDR_EXPR, type, arg);
|
||
TREE_REFERENCE_EXPR (rval) = 1;
|
||
return rval;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
if (TREE_ADDRESSABLE (targ) == 0)
|
||
{
|
||
tree temp;
|
||
|
||
if (TREE_CODE (targ) == CALL_EXPR && IS_AGGR_TYPE (argtype))
|
||
{
|
||
temp = build_cplus_new (argtype, targ, 1);
|
||
if (TREE_CODE (temp) == WITH_CLEANUP_EXPR)
|
||
rval = build (WITH_CLEANUP_EXPR, type,
|
||
build1 (ADDR_EXPR, type, TREE_OPERAND (temp, 0)),
|
||
0, TREE_OPERAND (temp, 2));
|
||
else
|
||
rval = build1 (ADDR_EXPR, type, temp);
|
||
goto done;
|
||
}
|
||
else
|
||
{
|
||
temp = get_temp_name (argtype, 0);
|
||
if (toplevel_bindings_p ())
|
||
{
|
||
/* Give this new temp some rtl and initialize it. */
|
||
DECL_INITIAL (temp) = targ;
|
||
TREE_STATIC (temp) = 1;
|
||
cp_finish_decl (temp, targ, NULL_TREE, 0, LOOKUP_ONLYCONVERTING);
|
||
/* Do this after declaring it static. */
|
||
rval = build_unary_op (ADDR_EXPR, temp, 0);
|
||
TREE_TYPE (rval) = type;
|
||
literal_flag = TREE_CONSTANT (rval);
|
||
goto done;
|
||
}
|
||
else
|
||
{
|
||
rval = build_unary_op (ADDR_EXPR, temp, 0);
|
||
if (binfo && !BINFO_OFFSET_ZEROP (binfo))
|
||
rval = convert_pointer_to (target_type, rval);
|
||
else
|
||
TREE_TYPE (rval) = type;
|
||
|
||
temp = build (MODIFY_EXPR, argtype, temp, arg);
|
||
TREE_SIDE_EFFECTS (temp) = 1;
|
||
return build (COMPOUND_EXPR, type, temp, rval);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
rval = build1 (ADDR_EXPR, type, arg);
|
||
|
||
done:
|
||
if (TYPE_USES_COMPLEX_INHERITANCE (argtype)
|
||
|| TYPE_USES_COMPLEX_INHERITANCE (target_type))
|
||
{
|
||
TREE_TYPE (rval) = build_pointer_type (argtype);
|
||
if (flags & LOOKUP_PROTECT)
|
||
rval = convert_pointer_to (target_type, rval);
|
||
else
|
||
rval
|
||
= convert_to_pointer_force (build_pointer_type (target_type), rval);
|
||
TREE_TYPE (rval) = type;
|
||
if (TREE_CODE (rval) == PLUS_EXPR || TREE_CODE (rval) == MINUS_EXPR)
|
||
TREE_TYPE (TREE_OPERAND (rval, 0))
|
||
= TREE_TYPE (TREE_OPERAND (rval, 1)) = type;
|
||
}
|
||
TREE_CONSTANT (rval) = literal_flag;
|
||
return rval;
|
||
}
|
||
|
||
/* For C++: Only need to do one-level references, but cannot
|
||
get tripped up on signed/unsigned differences.
|
||
|
||
DECL is either NULL_TREE or the _DECL node for a reference that is being
|
||
initialized. It can be error_mark_node if we don't know the _DECL but
|
||
we know it's an initialization. */
|
||
|
||
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 (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))
|
||
{
|
||
/* Look for a user-defined conversion to lvalue that we can use. */
|
||
|
||
rval_as_conversion = build_type_conversion (CONVERT_EXPR, type, 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;
|
||
|
||
{
|
||
int r = TREE_READONLY (expr);
|
||
int v = TREE_THIS_VOLATILE (expr);
|
||
ttr = cp_build_type_variant (TREE_TYPE (expr), r, v);
|
||
}
|
||
|
||
if (! real_lvalue_p (expr) &&
|
||
(decl == NULL_TREE || ! TYPE_READONLY (ttl)))
|
||
{
|
||
if (decl)
|
||
/* Ensure semantics of [dcl.init.ref] */
|
||
cp_pedwarn ("initialization of non-const `%T' from rvalue `%T'",
|
||
reftype, intype);
|
||
else
|
||
cp_pedwarn ("conversion to `%T' from rvalue `%T'",
|
||
reftype, intype);
|
||
}
|
||
else if (! (convtype & CONV_CONST))
|
||
{
|
||
if (! TYPE_READONLY (ttl) && TYPE_READONLY (ttr))
|
||
cp_pedwarn ("conversion from `%T' to `%T' discards const",
|
||
ttr, reftype);
|
||
else if (! TYPE_VOLATILE (ttl) && TYPE_VOLATILE (ttr))
|
||
cp_pedwarn ("conversion from `%T' to `%T' discards volatile",
|
||
ttr, reftype);
|
||
}
|
||
}
|
||
|
||
return build_up_reference (reftype, expr, flags,
|
||
! (convtype & CONV_CONST));
|
||
}
|
||
else if ((convtype & CONV_REINTERPRET) && lvalue_p (expr))
|
||
{
|
||
/* When casting an lvalue to a reference type, just convert into
|
||
a pointer to the new type and deference it. This is allowed
|
||
by San Diego WP section 5.2.9 paragraph 12, though perhaps it
|
||
should be done directly (jason). (int &)ri ---> *(int*)&ri */
|
||
|
||
/* B* bp; A& ar = (A&)bp; is valid, but it's probably not what they
|
||
meant. */
|
||
if (TREE_CODE (intype) == POINTER_TYPE
|
||
&& (comptypes (TREE_TYPE (intype), type, -1)))
|
||
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 if (decl)
|
||
{
|
||
tree rval_as_ctor = NULL_TREE;
|
||
|
||
if (rval_as_conversion)
|
||
{
|
||
if (rval_as_conversion == error_mark_node)
|
||
{
|
||
cp_error ("conversion from `%T' to `%T' is ambiguous",
|
||
intype, reftype);
|
||
return error_mark_node;
|
||
}
|
||
rval_as_conversion = build_up_reference (reftype, rval_as_conversion,
|
||
flags, 1);
|
||
}
|
||
|
||
/* Definitely need to go through a constructor here. */
|
||
if (TYPE_HAS_CONSTRUCTOR (type)
|
||
&& ! CLASSTYPE_ABSTRACT_VIRTUALS (type)
|
||
&& (rval = build_method_call
|
||
(NULL_TREE, constructor_name_full (type),
|
||
build_tree_list (NULL_TREE, expr), TYPE_BINFO (type),
|
||
LOOKUP_NO_CONVERSION|LOOKUP_SPECULATIVELY
|
||
| LOOKUP_ONLYCONVERTING)))
|
||
{
|
||
tree init;
|
||
|
||
if (toplevel_bindings_p ())
|
||
{
|
||
extern tree static_aggregates;
|
||
tree t = get_temp_name (type, toplevel_bindings_p ());
|
||
init = build_method_call (t, constructor_name_full (type),
|
||
build_tree_list (NULL_TREE, expr),
|
||
TYPE_BINFO (type),
|
||
LOOKUP_NORMAL|LOOKUP_NO_CONVERSION
|
||
| LOOKUP_ONLYCONVERTING);
|
||
|
||
if (init == error_mark_node)
|
||
return error_mark_node;
|
||
|
||
make_decl_rtl (t, NULL_PTR, 1);
|
||
static_aggregates = perm_tree_cons (expr, t, static_aggregates);
|
||
rval = build_unary_op (ADDR_EXPR, t, 0);
|
||
}
|
||
else
|
||
{
|
||
init = build_method_call (NULL_TREE, constructor_name_full (type),
|
||
build_tree_list (NULL_TREE, expr),
|
||
TYPE_BINFO (type),
|
||
LOOKUP_NORMAL|LOOKUP_NO_CONVERSION
|
||
|LOOKUP_ONLYCONVERTING);
|
||
|
||
if (init == error_mark_node)
|
||
return error_mark_node;
|
||
|
||
rval = build_cplus_new (type, init, 1);
|
||
rval = build_up_reference (reftype, rval, flags, 1);
|
||
}
|
||
rval_as_ctor = rval;
|
||
}
|
||
|
||
if (rval_as_ctor && rval_as_conversion)
|
||
{
|
||
cp_error ("ambiguous conversion from `%T' to `%T'; both user-defined conversion and constructor apply",
|
||
intype, reftype);
|
||
return error_mark_node;
|
||
}
|
||
else if (rval_as_ctor)
|
||
rval = rval_as_ctor;
|
||
else if (rval_as_conversion)
|
||
rval = rval_as_conversion;
|
||
else if (! IS_AGGR_TYPE (type) && ! IS_AGGR_TYPE (intype))
|
||
{
|
||
rval = convert (type, expr);
|
||
if (rval == error_mark_node)
|
||
return error_mark_node;
|
||
|
||
rval = build_up_reference (reftype, rval, flags, 1);
|
||
}
|
||
|
||
if (rval && ! TYPE_READONLY (TREE_TYPE (reftype)))
|
||
cp_pedwarn ("initializing non-const `%T' with `%T' will use a temporary",
|
||
reftype, intype);
|
||
}
|
||
|
||
if (rval)
|
||
{
|
||
/* If we found a way to convert earlier, then use it. */
|
||
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;
|
||
}
|
||
|
||
/* We are using a reference VAL for its value. Bash that reference all the
|
||
way down to its lowest form. */
|
||
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;
|
||
}
|
||
|
||
/* 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
|
||
to the derived class.
|
||
|
||
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
|
||
errors. */
|
||
tree
|
||
convert_to_aggr (type, expr, msgp, protect)
|
||
tree type, expr;
|
||
char **msgp;
|
||
int protect;
|
||
{
|
||
tree basetype = type;
|
||
tree name = TYPE_IDENTIFIER (basetype);
|
||
tree function, fndecl, fntype, parmtypes, parmlist, result;
|
||
tree method_name;
|
||
enum access_type access;
|
||
int can_be_private, can_be_protected;
|
||
|
||
if (! TYPE_HAS_CONSTRUCTOR (basetype))
|
||
{
|
||
if (msgp)
|
||
*msgp = "type `%s' does not have a constructor";
|
||
return error_mark_node;
|
||
}
|
||
|
||
access = access_public;
|
||
can_be_private = 0;
|
||
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, build_pointer_type (basetype), parmtypes);
|
||
|
||
#if 0
|
||
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);
|
||
|
||
while (fndecl)
|
||
{
|
||
if (DECL_ASSEMBLER_NAME (fndecl) == method_name)
|
||
{
|
||
function = fndecl;
|
||
if (protect)
|
||
{
|
||
if (TREE_PRIVATE (fndecl))
|
||
{
|
||
can_be_private =
|
||
(basetype == current_class_type
|
||
|| is_friend (basetype, current_function_decl)
|
||
|| purpose_member (basetype, DECL_ACCESS (fndecl)));
|
||
if (! can_be_private)
|
||
goto found;
|
||
}
|
||
else if (TREE_PROTECTED (fndecl))
|
||
{
|
||
if (! can_be_protected)
|
||
goto found;
|
||
}
|
||
}
|
||
goto found_and_ok;
|
||
}
|
||
fndecl = DECL_CHAIN (fndecl);
|
||
}
|
||
#endif
|
||
|
||
/* No exact conversion was found. See if an approximate
|
||
one will do. */
|
||
fndecl = TREE_VEC_ELT (CLASSTYPE_METHOD_VEC (basetype), 0);
|
||
if (TYPE_HAS_DESTRUCTOR (basetype))
|
||
fndecl = DECL_CHAIN (fndecl);
|
||
|
||
{
|
||
int saw_private = 0;
|
||
int saw_protected = 0;
|
||
struct candidate *candidates =
|
||
(struct candidate *) alloca ((decl_list_length (fndecl)+1) * sizeof (struct candidate));
|
||
struct candidate *cp = candidates;
|
||
|
||
while (fndecl)
|
||
{
|
||
function = fndecl;
|
||
cp->h_len = 2;
|
||
cp->harshness = (struct harshness_code *)
|
||
alloca (3 * sizeof (struct harshness_code));
|
||
|
||
compute_conversion_costs (fndecl, parmlist, cp, 2);
|
||
if ((cp->h.code & EVIL_CODE) == 0)
|
||
{
|
||
cp->u.field = fndecl;
|
||
if (protect)
|
||
{
|
||
if (TREE_PRIVATE (fndecl))
|
||
access = access_private;
|
||
else if (TREE_PROTECTED (fndecl))
|
||
access = access_protected;
|
||
else
|
||
access = access_public;
|
||
}
|
||
else
|
||
access = access_public;
|
||
|
||
if (access == access_private
|
||
? (basetype == current_class_type
|
||
|| is_friend (basetype, cp->function)
|
||
|| purpose_member (basetype, DECL_ACCESS (fndecl)))
|
||
: access == access_protected
|
||
? (can_be_protected
|
||
|| purpose_member (basetype, DECL_ACCESS (fndecl)))
|
||
: 1)
|
||
{
|
||
if (cp->h.code <= TRIVIAL_CODE)
|
||
goto found_and_ok;
|
||
cp++;
|
||
}
|
||
else
|
||
{
|
||
if (access == access_private)
|
||
saw_private = 1;
|
||
else
|
||
saw_protected = 1;
|
||
}
|
||
}
|
||
fndecl = DECL_CHAIN (fndecl);
|
||
}
|
||
if (cp - candidates)
|
||
{
|
||
/* 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. */
|
||
if (cp - candidates > 1)
|
||
qsort (candidates, /* char *base */
|
||
cp - candidates, /* int nel */
|
||
sizeof (struct candidate), /* int width */
|
||
rank_for_overload); /* int (*compar)() */
|
||
|
||
--cp;
|
||
if (cp->h.code & EVIL_CODE)
|
||
{
|
||
if (msgp)
|
||
*msgp = "ambiguous type conversion possible for `%s'";
|
||
return error_mark_node;
|
||
}
|
||
|
||
function = cp->function;
|
||
fndecl = cp->u.field;
|
||
goto found_and_ok;
|
||
}
|
||
else if (msgp)
|
||
{
|
||
if (saw_private)
|
||
if (saw_protected)
|
||
*msgp = "only private and protected conversions apply";
|
||
else
|
||
*msgp = "only private conversions apply";
|
||
else if (saw_protected)
|
||
*msgp = "only protected conversions apply";
|
||
else
|
||
*msgp = "no appropriate conversion to type `%s'";
|
||
}
|
||
return error_mark_node;
|
||
}
|
||
/* NOTREACHED */
|
||
|
||
found:
|
||
if (access == access_private)
|
||
if (! can_be_private)
|
||
{
|
||
if (msgp)
|
||
*msgp = TREE_PRIVATE (fndecl)
|
||
? "conversion to type `%s' is private"
|
||
: "conversion to type `%s' is from private base class";
|
||
return error_mark_node;
|
||
}
|
||
if (access == access_protected)
|
||
if (! can_be_protected)
|
||
{
|
||
if (msgp)
|
||
*msgp = TREE_PRIVATE (fndecl)
|
||
? "conversion to type `%s' is protected"
|
||
: "conversion to type `%s' is from protected base class";
|
||
return error_mark_node;
|
||
}
|
||
function = fndecl;
|
||
found_and_ok:
|
||
|
||
/* It will convert, but we don't do anything about it yet. */
|
||
if (msgp == 0)
|
||
return NULL_TREE;
|
||
|
||
fntype = TREE_TYPE (function);
|
||
function = default_conversion (function);
|
||
|
||
result = build_nt (CALL_EXPR, function,
|
||
convert_arguments (NULL_TREE, TYPE_ARG_TYPES (fntype),
|
||
parmlist, NULL_TREE, LOOKUP_NORMAL),
|
||
NULL_TREE);
|
||
TREE_TYPE (result) = TREE_TYPE (fntype);
|
||
TREE_SIDE_EFFECTS (result) = 1;
|
||
return result;
|
||
}
|
||
|
||
/* Call this when we know (for any reason) that expr is not, in fact,
|
||
zero. This routine is like convert_pointer_to, but it pays
|
||
attention to which specific instance of what type we want to
|
||
convert to. This routine should eventually become
|
||
convert_to_pointer after all references to convert_to_pointer
|
||
are removed. */
|
||
tree
|
||
convert_pointer_to_real (binfo, expr)
|
||
tree binfo, expr;
|
||
{
|
||
register tree intype = TREE_TYPE (expr);
|
||
tree ptr_type;
|
||
tree type, rval;
|
||
|
||
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 = build_pointer_type (type);
|
||
if (ptr_type == TYPE_MAIN_VARIANT (intype))
|
||
return expr;
|
||
|
||
if (intype == error_mark_node)
|
||
return 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)))
|
||
{
|
||
tree path;
|
||
int distance
|
||
= get_base_distance (binfo, TYPE_MAIN_VARIANT (TREE_TYPE (intype)),
|
||
0, &path);
|
||
|
||
/* This function shouldn't be called with unqualified arguments
|
||
but if it is, give them an error message that they can read. */
|
||
if (distance < 0)
|
||
{
|
||
cp_error ("cannot convert a pointer of type `%T' to a pointer of type `%T'",
|
||
TREE_TYPE (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;
|
||
}
|
||
|
||
/* Call this when we know (for any reason) that expr is
|
||
not, in fact, zero. This routine gets a type out of the first
|
||
argument and uses it to search for the type to convert to. If there
|
||
is more than one instance of that type in the expr, the conversion is
|
||
ambiguous. This routine should eventually go away, and all
|
||
callers should use convert_to_pointer_real. */
|
||
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);
|
||
}
|
||
|
||
/* Conversion...
|
||
|
||
FLAGS indicates how we should behave. */
|
||
|
||
tree
|
||
cp_convert (type, expr, convtype, flags)
|
||
tree type, expr;
|
||
int convtype, flags;
|
||
{
|
||
register tree e = expr;
|
||
register enum tree_code code = TREE_CODE (type);
|
||
|
||
if (TREE_CODE (e) == ERROR_MARK
|
||
|| TREE_CODE (TREE_TYPE (e)) == ERROR_MARK)
|
||
return error_mark_node;
|
||
|
||
if (IS_AGGR_TYPE (type) && (convtype & CONV_FORCE_TEMP))
|
||
/* We need a new temporary; don't take this shortcut. */;
|
||
else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (e)))
|
||
/* Trivial conversion: cv-qualifiers do not matter on rvalues. */
|
||
return fold (build1 (NOP_EXPR, type, e));
|
||
|
||
if (code == VOID_TYPE && (convtype & CONV_STATIC))
|
||
return build1 (CONVERT_EXPR, type, e);
|
||
|
||
#if 0
|
||
/* This is incorrect. A truncation can't be stripped this way.
|
||
Extensions will be stripped by the use of get_unwidened. */
|
||
if (TREE_CODE (e) == NOP_EXPR)
|
||
return convert (type, TREE_OPERAND (e, 0));
|
||
#endif
|
||
|
||
/* Just convert to the type of the member. */
|
||
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 (TREE_READONLY_DECL_P (e))
|
||
e = decl_constant_value (e);
|
||
|
||
if (INTEGRAL_CODE_P (code))
|
||
{
|
||
tree intype = TREE_TYPE (e);
|
||
enum tree_code form = TREE_CODE (intype);
|
||
/* enum = enum, enum = int, enum = float are all errors. */
|
||
if (flag_int_enum_equivalence == 0
|
||
&& TREE_CODE (type) == ENUMERAL_TYPE
|
||
&& ARITHMETIC_TYPE_P (intype)
|
||
&& ! (convtype & CONV_STATIC))
|
||
{
|
||
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 (CONVERT_EXPR, 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)
|
||
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)
|
||
{
|
||
if (IS_AGGR_TYPE (TREE_TYPE (e)))
|
||
{
|
||
tree rval;
|
||
rval = build_type_conversion (CONVERT_EXPR, 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));
|
||
}
|
||
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);
|
||
tree ctor = NULL_TREE;
|
||
tree conversion = NULL_TREE;
|
||
|
||
dtype = TYPE_MAIN_VARIANT (dtype);
|
||
|
||
/* Conversion of object pointers or signature pointers/references
|
||
to signature pointers/references. */
|
||
|
||
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;
|
||
}
|
||
|
||
/* 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) && ! DERIVED_FROM_P (type, dtype)
|
||
&& TYPE_HAS_CONVERSION (dtype))
|
||
conversion = build_type_conversion (CONVERT_EXPR, type, e, 1);
|
||
|
||
if (conversion == error_mark_node)
|
||
{
|
||
if (flags & LOOKUP_COMPLAIN)
|
||
error ("ambiguous pointer conversion");
|
||
return conversion;
|
||
}
|
||
|
||
if (TYPE_HAS_CONSTRUCTOR (type))
|
||
ctor = build_method_call (NULL_TREE, constructor_name_full (type),
|
||
build_tree_list (NULL_TREE, e),
|
||
TYPE_BINFO (type),
|
||
(flags & LOOKUP_NORMAL) | LOOKUP_SPECULATIVELY
|
||
| (convtype&CONV_NONCONVERTING ? 0 : LOOKUP_ONLYCONVERTING)
|
||
| (conversion ? LOOKUP_NO_CONVERSION : 0));
|
||
|
||
if (ctor == error_mark_node)
|
||
{
|
||
if (flags & LOOKUP_COMPLAIN)
|
||
cp_error ("in conversion to type `%T'", type);
|
||
if (flags & LOOKUP_SPECULATIVELY)
|
||
return NULL_TREE;
|
||
return error_mark_node;
|
||
}
|
||
|
||
if (conversion && ctor)
|
||
{
|
||
if (flags & LOOKUP_COMPLAIN)
|
||
error ("both constructor and type conversion operator apply");
|
||
if (flags & LOOKUP_SPECULATIVELY)
|
||
return NULL_TREE;
|
||
return error_mark_node;
|
||
}
|
||
else if (conversion)
|
||
return conversion;
|
||
else if (ctor)
|
||
{
|
||
ctor = build_cplus_new (type, ctor, 0);
|
||
return ctor;
|
||
}
|
||
}
|
||
|
||
/* If TYPE or TREE_TYPE (E) is not on the permanent_obstack,
|
||
then the it won't be hashed and hence compare as not equal,
|
||
even when it is. */
|
||
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;
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
tree
|
||
convert (type, expr)
|
||
tree type, expr;
|
||
{
|
||
return cp_convert (type, expr, CONV_OLD_CONVERT, LOOKUP_NORMAL);
|
||
}
|
||
|
||
/* Like convert, except permit conversions to take place which
|
||
are not normally allowed due to access restrictions
|
||
(such as conversion from sub-type to private super-type). */
|
||
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));
|
||
|
||
/* From typeck.c convert_for_assignment */
|
||
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))
|
||
{
|
||
/* compatible pointer to member functions. */
|
||
return build_ptrmemfunc (TYPE_PTRMEMFUNC_FN_TYPE (type), e, 1);
|
||
}
|
||
|
||
return cp_convert (type, e, CONV_C_CAST|convtype, LOOKUP_NORMAL);
|
||
}
|
||
|
||
/* Subroutine of build_type_conversion. */
|
||
static tree
|
||
build_type_conversion_1 (xtype, basetype, expr, typename, for_sure)
|
||
tree xtype, basetype;
|
||
tree expr;
|
||
tree typename;
|
||
int for_sure;
|
||
{
|
||
tree rval;
|
||
int flags;
|
||
|
||
if (for_sure == 0)
|
||
flags = LOOKUP_PROTECT|LOOKUP_ONLYCONVERTING;
|
||
else
|
||
flags = LOOKUP_NORMAL|LOOKUP_ONLYCONVERTING;
|
||
|
||
rval = build_method_call (expr, typename, NULL_TREE, NULL_TREE, flags);
|
||
if (rval == error_mark_node)
|
||
{
|
||
if (for_sure == 0)
|
||
return NULL_TREE;
|
||
return error_mark_node;
|
||
}
|
||
|
||
if (IS_AGGR_TYPE (TREE_TYPE (rval)))
|
||
return rval;
|
||
|
||
if (warn_cast_qual
|
||
&& TREE_TYPE (xtype)
|
||
&& (TREE_READONLY (TREE_TYPE (TREE_TYPE (rval)))
|
||
> TREE_READONLY (TREE_TYPE (xtype))))
|
||
warning ("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.
|
||
|
||
Changes to this functions should be mirrored in user_harshness.
|
||
|
||
FIXME: Ambiguity checking is wrong. Should choose one by the implicit
|
||
object parameter, or by the second standard conversion sequence if
|
||
that doesn't do it. This will probably wait for an overloading rewrite.
|
||
(jason 8/9/95) */
|
||
|
||
tree
|
||
build_type_conversion (code, xtype, expr, for_sure)
|
||
enum tree_code code;
|
||
tree xtype, expr;
|
||
int for_sure;
|
||
{
|
||
/* C++: check to see if we can convert this aggregate type
|
||
into the required type. */
|
||
tree basetype;
|
||
tree conv;
|
||
tree winner = NULL_TREE;
|
||
|
||
if (expr == error_mark_node)
|
||
return 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))
|
||
return NULL_TREE;
|
||
|
||
/* Do we have an exact match? */
|
||
{
|
||
tree typename = build_typename_overload (xtype);
|
||
if (lookup_fnfields (TYPE_BINFO (basetype), typename, 0))
|
||
return build_type_conversion_1 (xtype, basetype, expr, typename,
|
||
for_sure);
|
||
}
|
||
|
||
/* Nope; try looking for others. */
|
||
for (conv = lookup_conversions (basetype); conv; conv = TREE_CHAIN (conv))
|
||
{
|
||
if (winner && TREE_PURPOSE (winner) == TREE_PURPOSE (conv))
|
||
continue;
|
||
|
||
if (can_convert (xtype, TREE_VALUE (conv)))
|
||
{
|
||
if (winner)
|
||
{
|
||
if (for_sure)
|
||
{
|
||
cp_error ("ambiguous conversion from `%T' to `%T'", basetype,
|
||
xtype);
|
||
cp_error (" candidate conversions include `%T' and `%T'",
|
||
TREE_VALUE (winner), TREE_VALUE (conv));
|
||
}
|
||
return NULL_TREE;
|
||
}
|
||
else
|
||
winner = conv;
|
||
}
|
||
}
|
||
|
||
if (winner)
|
||
return build_type_conversion_1 (xtype, basetype, expr,
|
||
TREE_PURPOSE (winner), for_sure);
|
||
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* Convert the given EXPR to one of a group of types suitable for use in an
|
||
expression. DESIRES is a combination of various WANT_* flags (q.v.)
|
||
which indicates which types are suitable. If COMPLAIN is 1, complain
|
||
about ambiguity; otherwise, the caller will deal with it. */
|
||
|
||
tree
|
||
build_expr_type_conversion (desires, expr, complain)
|
||
int desires;
|
||
tree expr;
|
||
int complain;
|
||
{
|
||
tree basetype = TREE_TYPE (expr);
|
||
tree conv;
|
||
tree winner = NULL_TREE;
|
||
|
||
if (TREE_CODE (basetype) == OFFSET_TYPE)
|
||
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) && TREE_CODE (expr) == INTEGER_CST
|
||
&& integer_zerop (expr))
|
||
return expr;
|
||
/* else fall through... */
|
||
|
||
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;
|
||
|
||
if (winner && TREE_PURPOSE (winner) == TREE_PURPOSE (conv))
|
||
continue;
|
||
|
||
candidate = TREE_VALUE (conv);
|
||
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;
|
||
}
|
||
|
||
if (win)
|
||
{
|
||
if (winner)
|
||
{
|
||
if (complain)
|
||
{
|
||
cp_error ("ambiguous default type conversion from `%T'",
|
||
basetype);
|
||
cp_error (" candidate conversions include `%T' and `%T'",
|
||
TREE_VALUE (winner), TREE_VALUE (conv));
|
||
}
|
||
return error_mark_node;
|
||
}
|
||
else
|
||
winner = conv;
|
||
}
|
||
}
|
||
|
||
if (winner)
|
||
return build_type_conversion_1 (TREE_VALUE (winner), basetype, expr,
|
||
TREE_PURPOSE (winner), 1);
|
||
|
||
return NULL_TREE;
|
||
}
|
||
|
||
/* 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??? */
|
||
int
|
||
build_default_binary_type_conversion (code, arg1, arg2)
|
||
enum tree_code code;
|
||
tree *arg1, *arg2;
|
||
{
|
||
switch (code)
|
||
{
|
||
case MULT_EXPR:
|
||
case TRUNC_DIV_EXPR:
|
||
case CEIL_DIV_EXPR:
|
||
case FLOOR_DIV_EXPR:
|
||
case ROUND_DIV_EXPR:
|
||
case EXACT_DIV_EXPR:
|
||
*arg1 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg1, 0);
|
||
*arg2 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg2, 0);
|
||
break;
|
||
|
||
case TRUNC_MOD_EXPR:
|
||
case FLOOR_MOD_EXPR:
|
||
case LSHIFT_EXPR:
|
||
case RSHIFT_EXPR:
|
||
case BIT_AND_EXPR:
|
||
case BIT_XOR_EXPR:
|
||
case BIT_IOR_EXPR:
|
||
*arg1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, *arg1, 0);
|
||
*arg2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, *arg2, 0);
|
||
break;
|
||
|
||
case PLUS_EXPR:
|
||
{
|
||
tree a1, a2, p1, p2;
|
||
int wins;
|
||
|
||
a1 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg1, 0);
|
||
a2 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg2, 0);
|
||
p1 = build_expr_type_conversion (WANT_POINTER, *arg1, 0);
|
||
p2 = build_expr_type_conversion (WANT_POINTER, *arg2, 0);
|
||
|
||
wins = (a1 && a2) + (a1 && p2) + (p1 && a2);
|
||
|
||
if (wins > 1)
|
||
error ("ambiguous default type conversion for `operator +'");
|
||
|
||
if (a1 && a2)
|
||
*arg1 = a1, *arg2 = a2;
|
||
else if (a1 && p2)
|
||
*arg1 = a1, *arg2 = p2;
|
||
else
|
||
*arg1 = p1, *arg2 = a2;
|
||
break;
|
||
}
|
||
|
||
case MINUS_EXPR:
|
||
{
|
||
tree a1, a2, p1, p2;
|
||
int wins;
|
||
|
||
a1 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg1, 0);
|
||
a2 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg2, 0);
|
||
p1 = build_expr_type_conversion (WANT_POINTER, *arg1, 0);
|
||
p2 = build_expr_type_conversion (WANT_POINTER, *arg2, 0);
|
||
|
||
wins = (a1 && a2) + (p1 && p2) + (p1 && a2);
|
||
|
||
if (wins > 1)
|
||
error ("ambiguous default type conversion for `operator -'");
|
||
|
||
if (a1 && a2)
|
||
*arg1 = a1, *arg2 = a2;
|
||
else if (p1 && p2)
|
||
*arg1 = p1, *arg2 = p2;
|
||
else
|
||
*arg1 = p1, *arg2 = a2;
|
||
break;
|
||
}
|
||
|
||
case GT_EXPR:
|
||
case LT_EXPR:
|
||
case GE_EXPR:
|
||
case LE_EXPR:
|
||
case EQ_EXPR:
|
||
case NE_EXPR:
|
||
{
|
||
tree a1, a2, p1, p2;
|
||
int wins;
|
||
|
||
a1 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg1, 0);
|
||
a2 = build_expr_type_conversion (WANT_ARITH | WANT_ENUM, *arg2, 0);
|
||
p1 = build_expr_type_conversion (WANT_POINTER | WANT_NULL, *arg1, 0);
|
||
p2 = build_expr_type_conversion (WANT_POINTER | WANT_NULL, *arg2, 0);
|
||
|
||
wins = (a1 && a2) + (p1 && p2);
|
||
|
||
if (wins > 1)
|
||
cp_error ("ambiguous default type conversion for `%O'", code);
|
||
|
||
if (a1 && a2)
|
||
*arg1 = a1, *arg2 = a2;
|
||
else
|
||
*arg1 = p1, *arg2 = p2;
|
||
break;
|
||
}
|
||
|
||
case TRUTH_ANDIF_EXPR:
|
||
case TRUTH_ORIF_EXPR:
|
||
*arg1 = convert (boolean_type_node, *arg1);
|
||
*arg2 = convert (boolean_type_node, *arg2);
|
||
break;
|
||
|
||
default:
|
||
*arg1 = NULL_TREE;
|
||
*arg2 = NULL_TREE;
|
||
}
|
||
|
||
if (*arg1 == error_mark_node || *arg2 == error_mark_node)
|
||
cp_error ("ambiguous default type conversion for `%O'", code);
|
||
|
||
if (*arg1 && *arg2)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Implements integral promotion (4.1) and float->double promotion. */
|
||
tree
|
||
type_promotes_to (type)
|
||
tree type;
|
||
{
|
||
int constp, volatilep;
|
||
|
||
if (type == error_mark_node)
|
||
return error_mark_node;
|
||
|
||
constp = TYPE_READONLY (type);
|
||
volatilep = TYPE_VOLATILE (type);
|
||
type = TYPE_MAIN_VARIANT (type);
|
||
|
||
/* bool always promotes to int (not unsigned), even if it's the same
|
||
size. */
|
||
if (type == boolean_type_node)
|
||
type = integer_type_node;
|
||
|
||
/* Normally convert enums to int, but convert wide enums to something
|
||
wider. */
|
||
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))
|
||
{
|
||
/* Traditionally, unsignedness is preserved in default promotions.
|
||
Otherwise, retain unsignedness if really not getting bigger. */
|
||
if (TREE_UNSIGNED (type)
|
||
&& (flag_traditional
|
||
|| 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_type_variant (type, constp, volatilep);
|
||
}
|