93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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* VHDL variable and signal types.
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*
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* Copyright (C) 2008 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_VHDL_TYPE_HH
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#define INC_VHDL_TYPE_HH
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#include "vhdl_element.hh"
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enum vhdl_type_name_t {
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VHDL_TYPE_STD_LOGIC,
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VHDL_TYPE_STD_LOGIC_VECTOR,
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VHDL_TYPE_STRING,
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VHDL_TYPE_LINE,
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VHDL_TYPE_FILE,
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VHDL_TYPE_INTEGER,
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VHDL_TYPE_BOOLEAN,
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VHDL_TYPE_SIGNED,
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VHDL_TYPE_UNSIGNED,
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VHDL_TYPE_TIME,
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VHDL_TYPE_ARRAY,
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};
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/*
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* A type at the moment is just a name. It shouldn't get
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* too much more complex, as Verilog's type system is much
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* simpler than VHDL's.
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*/
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class vhdl_type : public vhdl_element {
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public:
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// Scalar constructor
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vhdl_type(vhdl_type_name_t name, int msb = 0, int lsb = 0)
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: name_(name), msb_(msb), lsb_(lsb), base_(NULL) {}
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// Array constructor
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vhdl_type(vhdl_type *base, const std::string &array_name,
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int msb, int lsb)
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: name_(VHDL_TYPE_ARRAY), msb_(msb), lsb_(lsb), base_(base),
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array_name_(array_name) {}
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// Copy constructor
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vhdl_type(const vhdl_type &other);
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virtual ~vhdl_type();
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void emit(std::ostream &of, int level) const;
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vhdl_type_name_t get_name() const { return name_; }
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std::string get_string() const;
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std::string get_decl_string() const;
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std::string get_type_decl_string() const;
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vhdl_type *get_base() const;
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int get_width() const { return msb_ - lsb_ + 1; }
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int get_msb() const { return msb_; }
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int get_lsb() const { return lsb_; }
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// Common types
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static vhdl_type *std_logic();
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static vhdl_type *string();
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static vhdl_type *line();
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static vhdl_type *std_logic_vector(int msb, int lsb);
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static vhdl_type *nunsigned(int width, int lsb=0);
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static vhdl_type *nsigned(int width, int lsb=0);
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static vhdl_type *integer();
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static vhdl_type *boolean();
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static vhdl_type *time();
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static vhdl_type *type_for(int width, bool issigned, int lsb=0);
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static vhdl_type *array_of(vhdl_type *b, std::string &n, int m, int l);
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protected:
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vhdl_type_name_t name_;
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int msb_, lsb_;
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vhdl_type *base_; // Array base type for VHDL_TYPE_ARRAY
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std::string array_name_; // Type name for the array `type array_name_ is ...'
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};
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#endif
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