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/*
* Copyright (c) 2003-2010 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
# include "netlist.h"
# include "netmisc.h"
# include <cassert>
/*
* Search for the hierarchical name.
*/
NetScope*symbol_search(const LineInfo*li, Design*des, NetScope*scope,
pform_name_t path,
NetNet*&net,
const NetExpr*&par,
NetEvent*&eve,
const NetExpr*&ex1, const NetExpr*&ex2)
{
assert(scope);
bool hier_path = false;
/* Get the tail name of the object we are looking for. */
perm_string key = peek_tail_name(path);
path.pop_back();
/* Initialize output argument to cleared. */
net = 0;
par = 0;
eve = 0;
/* If the path has a scope part, then search for the specified
scope that we are supposed to search. */
if (! path.empty()) {
list<hname_t> path_list = eval_scope_path(des, scope, path);
assert(path_list.size() <= path.size());
// If eval_scope_path returns a short list, then some
// part of the scope was not found. Abort.
if (path_list.size() < path.size())
return 0;
scope = des->find_scope(scope, path_list);
if (scope && scope->is_auto() && li) {
cerr << li->get_fileline() << ": error: Hierarchical "
"reference to automatically allocated item "
"`" << key << "' in path `" << path << "'" << endl;
des->errors += 1;
}
hier_path = true;
}
while (scope) {
if ( (net = scope->find_signal(key)) )
return scope;
if ( (eve = scope->find_event(key)) )
return scope;
if ( (par = scope->get_parameter(key, ex1, ex2)) )
return scope;
/* We can't look up if we are at the enclosing module scope
* or if a hierarchical path was given. */
if ((scope->type() == NetScope::MODULE) || hier_path)
scope = 0;
else
scope = scope->parent();
}
return 0;
}
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