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/*
* Support functions for VHDL output.
*
* Copyright (C) 2008-2010 Nick Gasson (nick@nickg.me.uk)
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef INC_SUPPORT_HH
#define INC_SUPPORT_HH
#include "vhdl_syntax.hh"
enum support_function_t {
SF_UNSIGNED_TO_BOOLEAN = 0,
SF_SIGNED_TO_BOOLEAN,
SF_BOOLEAN_TO_LOGIC,
SF_REDUCE_OR,
SF_REDUCE_AND,
SF_REDUCE_XOR,
SF_REDUCE_XNOR,
SF_TERNARY_LOGIC,
SF_TERNARY_UNSIGNED,
SF_TERNARY_SIGNED,
SF_LOGIC_TO_INTEGER,
SF_SIGNED_TO_LOGIC,
SF_UNSIGNED_TO_LOGIC
};
class support_function : public vhdl_function {
public:
support_function(support_function_t type)
: vhdl_function(function_name(type), function_type(type)),
type_(type) {}
void emit(std::ostream &of, int level) const;
static const char *function_name(support_function_t type);
static vhdl_type *function_type(support_function_t type);
private:
void emit_ternary(std::ostream &of, int level) const;
void emit_reduction(std::ostream &of, int level, const char *op,
char unit) const;
support_function_t type_;
};
#endif
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