1 /* 2 * Support functions for VHDL output. 3 * 4 * Copyright (C) 2008-2010 Nick Gasson (nick@nickg.me.uk) 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 */ 20 21 #ifndef INC_SUPPORT_HH 22 #define INC_SUPPORT_HH 23 24 #include "vhdl_syntax.hh" 25 26 enum support_function_t { 27 SF_UNSIGNED_TO_BOOLEAN = 0, 28 SF_SIGNED_TO_BOOLEAN, 29 SF_BOOLEAN_TO_LOGIC, 30 SF_REDUCE_OR, 31 SF_REDUCE_AND, 32 SF_REDUCE_XOR, 33 SF_REDUCE_XNOR, 34 SF_TERNARY_LOGIC, 35 SF_TERNARY_UNSIGNED, 36 SF_TERNARY_SIGNED, 37 SF_LOGIC_TO_INTEGER, 38 SF_SIGNED_TO_LOGIC, 39 SF_UNSIGNED_TO_LOGIC 40 }; 41 42 class support_function : public vhdl_function { 43 public: support_function(support_function_t type)44 explicit support_function(support_function_t type) 45 : vhdl_function(function_name(type), function_type(type)), 46 type_(type) {} 47 void emit(std::ostream &of, int level) const; 48 static const char *function_name(support_function_t type); 49 static vhdl_type *function_type(support_function_t type); 50 51 private: 52 void emit_ternary(std::ostream &of, int level) const; 53 void emit_reduction(std::ostream &of, int level, const char *op, 54 char unit) const; 55 56 support_function_t type_; 57 }; 58 59 #endif 60