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Lars-Peter Clausen
5fa1aecd4f
SystemVerilog defines different levels of type compatibility. * Matching * Equivalent * Assignment compatible * Cast compatible At the moment the `nettype_t` has only one type compatibility test. It is used to check assignment compatibility when assigning to a dynamic array, queue or class. The current implementation rejects a few cases that should allowed and allows a few cases that should be rejected. Dynamic arrays and queues are assignment compatible if their element types are compatible. And two packed types are equivalent if they are both 2-state or 4-state, both signed or unsigned and have the same packed with. In the current implementation the sign is not considered and instead of checking if the packed width is the same it checks that the dimensions are identical. Signed-off-by: Lars-Peter Clausen <[email protected]>
56 lines
2.1 KiB
C++
56 lines
2.1 KiB
C++
#ifndef IVL_netdarray_H
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#define IVL_netdarray_H
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/*
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* Copyright (c) 2012-2015 Stephen Williams ([email protected])
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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# include "nettypes.h"
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# include "ivl_target.h"
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class netdarray_t : public netarray_t {
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public:
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explicit netdarray_t(ivl_type_t vec);
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~netdarray_t();
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// This is the "base_type()" virtual method of the
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// nettype_base_t. The ivl_target api expects this to return
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// IVL_VT_DARRAY for dynamic arrays?
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ivl_variable_type_t base_type() const;
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// A dynamic array may have a type that is signed.
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inline bool get_signed() const { return element_type()->get_signed(); }
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// This is the base_type() of the element of the array. We
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// need this in some cases in order to get the base type of
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// the element, and not the IVL_VT_DARRAY of the array itself.
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inline ivl_variable_type_t element_base_type() const { return element_type()->base_type(); }
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// This is a convenience function for getting the width of an
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// element. Strictly speaking it's not necessary.
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inline unsigned long element_width(void) const { return element_type()->packed_width(); }
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std::ostream& debug_dump(std::ostream&) const;
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private:
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bool test_compatibility(ivl_type_t that) const;
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bool test_equivalence(ivl_type_t that) const;
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};
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#endif /* IVL_netdarray_H */
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