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118 lines
4.4 KiB
C
118 lines
4.4 KiB
C
/* Variables and structures for overloading rules.
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Copyright (C) 1993 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* The following structure is used when comparing various alternatives
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for overloading. The unsigned quantity `strikes.i' is used
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for fast comparison of two possibilities. This number is an
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aggregate of four constituents:
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EVIL: if this is non-zero, then the candidate should not be considered
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ELLIPSIS: if this is non-zero, then some actual argument has been matched
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against an ellipsis
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USER: if this is non-zero, then a user-defined type conversion is needed
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B_OR_D: if this is non-zero, then use a base pointer instead of the
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type of the pointer we started with.
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EASY: if this is non-zero, then we have a builtin conversion
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(such as int to long, int to float, etc) to do.
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If two candidates require user-defined type conversions, and the
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type conversions are not identical, then an ambiguity error
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is reported.
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If two candidates agree on user-defined type conversions,
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and one uses pointers of strictly higher type (derived where
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another uses base), then that alternative is silently chosen.
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Note that this technique really only works for 255 arguments. Perhaps
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this is not enough. */
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/* These macros and harshness_code are used by the NEW METHOD. */
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#define EVIL_CODE (1<<7)
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#define CONST_CODE (1<<6)
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#define ELLIPSIS_CODE (1<<5)
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#define USER_CODE (1<<4)
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#define STD_CODE (1<<3)
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#define PROMO_CODE (1<<2)
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#define QUAL_CODE (1<<1)
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#define TRIVIAL_CODE (1<<0)
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struct harshness_code
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{
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/* What kind of conversion is involved. */
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unsigned short code;
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/* The inheritance distance. */
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short distance;
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/* For a PROMO_CODE, Any special penalties involved in integral conversions.
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This exists because $4.1 of the ARM states that something like
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`short unsigned int' should promote to `int', not `unsigned int'.
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If, for example, it tries to match two fns, f(int) and f(unsigned),
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f(int) should be a better match than f(unsigned) by this rule. Without
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this extra metric, they both only appear as "integral promotions", which
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will lead to an ambiguity.
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For a TRIVIAL_CODE, This is also used by build_overload_call_real and
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convert_harshness to keep track of other information we need. */
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unsigned short int_penalty;
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};
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struct candidate
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{
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struct harshness_code h; /* Used for single-argument conversions. */
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int h_len; /* The length of the harshness vector. */
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tree function; /* A FUNCTION_DECL */
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tree basetypes; /* The path to function. */
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tree arg; /* first parm to function. */
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/* Indexed by argument number, encodes evil, user, d_to_b, and easy
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strikes for that argument. At end of array, we store the index+1
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of where we started using default parameters, or 0 if there are
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none. */
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struct harshness_code *harshness;
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union
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{
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tree field; /* If no evil strikes, the FUNCTION_DECL of
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the function (if a member function). */
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int bad_arg; /* the index of the first bad argument:
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0 if no bad arguments
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> 0 is first bad argument
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-1 if extra actual arguments
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-2 if too few actual arguments.
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-3 if const/non const method mismatch.
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-4 if type unification failed.
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-5 if contravariance violation. */
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} u;
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};
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int rank_for_overload PROTO ((struct candidate *, struct candidate *));
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/* Variables shared between class.c and call.c. */
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extern int n_vtables;
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extern int n_vtable_entries;
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extern int n_vtable_searches;
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extern int n_vtable_elems;
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extern int n_convert_harshness;
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extern int n_compute_conversion_costs;
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extern int n_build_method_call;
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extern int n_inner_fields_searched;
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