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/*
 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of The TenDRA Project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id$
 */
/*
                 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright
    owned by the United Kingdom Secretary of State for Defence
    acting through the Defence Evaluation and Research Agency
    (DERA).  It is made available to Recipients with a
    royalty-free licence for its use, reproduction, transfer
    to other parties and amendment for any purpose not excluding
    product development provided that any such use et cetera
    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is
        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to
        show both the nature of and the organisation responsible
        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another
        party shall be deemed to be that party's acceptance of
        these conditions;

        (4) DERA gives no warranty or assurance as to its
        quality or suitability for any purpose and DERA accepts
        no liability whatsoever in relation to any use to which
        it may be put.
*/


#ifndef OVERLOAD_INCLUDED
#define OVERLOAD_INCLUDED


/*
    STRUCTURE REPRESENTING A LIST OF OVERLOADED FUNCTIONS

    During the resolution of overloaded functions, the set of candidate
    functions is formed into a table.  Each element of the table consists
    of a function identifier plus a rank for this candidate (see below) and,
    for viable candidates, a list of conversion sequence ranks for each
    argument.
*/

#ifndef CONVERT_INCLUDED
#include "convert.h"
#endif

typedef struct {
        IDENTIFIER func;
        IDENTIFIER base;
        int kind;
        unsigned rank;
        CONVERSION *convs;
        EXP cond;
} CANDIDATE;

typedef struct {
        CANDIDATE *elem;
        unsigned size;
        unsigned max_size;
        CONVERSION *convs;
        unsigned nconvs;
} CANDIDATE_LIST;


/*
    FUNCTION OVERLOADING DECLARATIONS

    The routines in this module are concerned with function overloading.
*/

extern void swap_ptypes(IDENTIFIER);
extern IDENTIFIER resolve_call(IDENTIFIER, LIST(EXP), QUALIFIER, int);
extern EXP resolve_cast(TYPE, EXP, ERROR *, int, int, LIST(IDENTIFIER));
extern void add_candidates(CANDIDATE_LIST *, IDENTIFIER, int, int);
extern IDENTIFIER koenig_candidates(CANDIDATE_LIST *, IDENTIFIER, TYPE, int);
extern void swap_candidates(CANDIDATE_LIST *, unsigned);
extern ERROR list_candidates(ERROR, CANDIDATE_LIST *, unsigned);
extern CANDIDATE *resolve_overload(CANDIDATE_LIST *, LIST(EXP), TYPE, int);
extern CANDIDATE *resolve_ambiguous(CANDIDATE_LIST *, LIST(EXP), TYPE, int);
extern IDENTIFIER make_ambig_func(CANDIDATE_LIST *, IDENTIFIER, LIST(EXP),
                                  QUALIFIER, ERROR *);
extern IDENTIFIER resolve_func(IDENTIFIER, TYPE, int, int, LIST(IDENTIFIER),
                               int *);
extern void free_candidates(CANDIDATE_LIST *);
extern CANDIDATE_LIST candidates;
extern unsigned match_no_viable;
extern unsigned match_no_args;
extern int resolved_kind;
extern int match_this;


/*
    RANKING OF CANDIDATES

    These values give the ranking values for candidate functions.  These
    correspond to the candidates with the wrong number of parameters, those
    with the right number of parameters (the plausible candidates), the
    viable candidates, and the best viable candidate.  They are is ascending
    order.
*/

#define RANK_IGNORE             ((unsigned)0)
#define RANK_NONE               ((unsigned)1)
#define RANK_ARGS               ((unsigned)2)
#define RANK_VIABLE             ((unsigned)3)
#define RANK_TARGET             ((unsigned)4)
#define RANK_BEST               ((unsigned)5)


/*
    CANDIDATE KINDS

    These values give the various kinds of candidate functions, simple
    functions, constructors, user-defined conversions, non-member operators,
    member operators and built-in operators.
*/

#define KIND_FUNC               0
#define KIND_CONSTR             1
#define KIND_CONV               2
#define KIND_OP                 3
#define KIND_MEM_OP             4
#define KIND_BUILTIN            5
#define KIND_MARK               8


#endif