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