mirror of
https://github.com/steveicarus/iverilog.git
synced 2026-08-29 01:03:29 +02:00
Lars-Peter Clausen
2e0d6d5af1
Currently typedefs are just a pointer to a data_type_t. Currently typedefs are implemented by setting the name field of a data_type_t when a typedef of the type is declared. This works mostly, but there are some corner cases that can't be supported. E.g. a typedef of a typedef does not work as it overwrites the name field of the same data_type_t multiple times. Forward typedefs can also not be supported since forward typedefs allow to reference a type before it has been declared. There are also some problems with type identifier references from a higher-level scope if there is a type identifier in the current scope with the same name, but it is declared after the type identifier has been referenced. E.g. in the following x should be a vector fo width 8, but it will be a vector of width 4, because while the right type is used it is elaborated in the wrong scope. ``` localparam A = 8; typedef logic [A-1:0] T; module M; localparam A = 4; T x; typedef int T; endmodule ``` Furthermore typedefs used for the type of ports are elaborated in the wrong scope. To handle these corner case issues introduce a data_type_t for typedefs. Signed-off-by: Lars-Peter Clausen <[email protected]>
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*
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* Copyright (c) 2008-2021 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 "PScope.h"
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using namespace std;
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bool LexicalScope::var_init_needs_explicit_lifetime() const
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{
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return false;
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}
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PWire* LexicalScope::wires_find(perm_string name)
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{
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map<perm_string,PWire*>::const_iterator cur = wires.find(name);
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if (cur == wires.end())
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return 0;
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else
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return (*cur).second;
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}
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PNamedItem::SymbolType LexicalScope::param_expr_t::symbol_type() const
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{
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return PARAM;
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}
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PScope::PScope(perm_string n, LexicalScope*parent)
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: LexicalScope(parent), name_(n)
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{
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time_unit = 0;
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time_precision = 0;
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time_unit_is_default = true;
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time_prec_is_default = true;
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}
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PScope::~PScope()
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{
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for(typedef_map_t::iterator it = typedefs.begin(); it != typedefs.end();
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++it)
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delete it->second;
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}
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PScopeExtra::PScopeExtra(perm_string n, LexicalScope*parent)
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: PScope(n, parent)
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{
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time_unit_is_local = false;
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time_prec_is_local = false;
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}
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PScopeExtra::~PScopeExtra()
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{
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}
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