mirror of
https://github.com/pmret/gcc-papermario.git
synced 2024-11-08 11:53:01 +01:00
118 lines
4.4 KiB
C
118 lines
4.4 KiB
C
/* Variables and structures for overloading rules.
|
|
Copyright (C) 1993 Free Software Foundation, Inc.
|
|
|
|
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. */
|
|
|
|
/* The following structure is used when comparing various alternatives
|
|
for overloading. The unsigned quantity `strikes.i' is used
|
|
for fast comparison of two possibilities. This number is an
|
|
aggregate of four constituents:
|
|
|
|
EVIL: if this is non-zero, then the candidate should not be considered
|
|
ELLIPSIS: if this is non-zero, then some actual argument has been matched
|
|
against an ellipsis
|
|
USER: if this is non-zero, then a user-defined type conversion is needed
|
|
B_OR_D: if this is non-zero, then use a base pointer instead of the
|
|
type of the pointer we started with.
|
|
EASY: if this is non-zero, then we have a builtin conversion
|
|
(such as int to long, int to float, etc) to do.
|
|
|
|
If two candidates require user-defined type conversions, and the
|
|
type conversions are not identical, then an ambiguity error
|
|
is reported.
|
|
|
|
If two candidates agree on user-defined type conversions,
|
|
and one uses pointers of strictly higher type (derived where
|
|
another uses base), then that alternative is silently chosen.
|
|
|
|
Note that this technique really only works for 255 arguments. Perhaps
|
|
this is not enough. */
|
|
|
|
/* These macros and harshness_code are used by the NEW METHOD. */
|
|
#define EVIL_CODE (1<<7)
|
|
#define CONST_CODE (1<<6)
|
|
#define ELLIPSIS_CODE (1<<5)
|
|
#define USER_CODE (1<<4)
|
|
#define STD_CODE (1<<3)
|
|
#define PROMO_CODE (1<<2)
|
|
#define QUAL_CODE (1<<1)
|
|
#define TRIVIAL_CODE (1<<0)
|
|
|
|
struct harshness_code
|
|
{
|
|
/* What kind of conversion is involved. */
|
|
unsigned short code;
|
|
|
|
/* The inheritance distance. */
|
|
short distance;
|
|
|
|
/* For a PROMO_CODE, Any special penalties involved in integral conversions.
|
|
This exists because $4.1 of the ARM states that something like
|
|
`short unsigned int' should promote to `int', not `unsigned int'.
|
|
If, for example, it tries to match two fns, f(int) and f(unsigned),
|
|
f(int) should be a better match than f(unsigned) by this rule. Without
|
|
this extra metric, they both only appear as "integral promotions", which
|
|
will lead to an ambiguity.
|
|
For a TRIVIAL_CODE, This is also used by build_overload_call_real and
|
|
convert_harshness to keep track of other information we need. */
|
|
unsigned short int_penalty;
|
|
};
|
|
|
|
struct candidate
|
|
{
|
|
struct harshness_code h; /* Used for single-argument conversions. */
|
|
|
|
int h_len; /* The length of the harshness vector. */
|
|
|
|
tree function; /* A FUNCTION_DECL */
|
|
tree basetypes; /* The path to function. */
|
|
tree arg; /* first parm to function. */
|
|
|
|
/* Indexed by argument number, encodes evil, user, d_to_b, and easy
|
|
strikes for that argument. At end of array, we store the index+1
|
|
of where we started using default parameters, or 0 if there are
|
|
none. */
|
|
struct harshness_code *harshness;
|
|
|
|
union
|
|
{
|
|
tree field; /* If no evil strikes, the FUNCTION_DECL of
|
|
the function (if a member function). */
|
|
int bad_arg; /* the index of the first bad argument:
|
|
0 if no bad arguments
|
|
> 0 is first bad argument
|
|
-1 if extra actual arguments
|
|
-2 if too few actual arguments.
|
|
-3 if const/non const method mismatch.
|
|
-4 if type unification failed.
|
|
-5 if contravariance violation. */
|
|
} u;
|
|
};
|
|
int rank_for_overload PROTO ((struct candidate *, struct candidate *));
|
|
|
|
/* Variables shared between class.c and call.c. */
|
|
|
|
extern int n_vtables;
|
|
extern int n_vtable_entries;
|
|
extern int n_vtable_searches;
|
|
extern int n_vtable_elems;
|
|
extern int n_convert_harshness;
|
|
extern int n_compute_conversion_costs;
|
|
extern int n_build_method_call;
|
|
extern int n_inner_fields_searched;
|