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/*
* Copyright (c) 1998-2021 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include "config.h"
# include "Module.h"
# include "PGate.h"
# include "PWire.h"
# include <cassert>
using namespace std;
list<Module::named_expr_t> Module::user_defparms;
/* n is a permallocated string. */
Module::Module(LexicalScope*parent, perm_string n)
: PScopeExtra(n, parent)
{
library_flag = false;
is_cell = false;
is_interface = false;
program_block = false;
uc_drive = UCD_NONE;
}
Module::~Module()
{
}
void Module::add_gate(PGate*gate)
{
gates_.push_back(gate);
}
unsigned Module::port_count() const
{
return ports.size();
}
/*
* Return the array of PEIdent object that are at this port of the
* module. If the port is internally unconnected, return an empty
* array.
*/
const vector<PEIdent*>& Module::get_port(unsigned idx) const
{
assert(idx < ports.size());
static const vector<PEIdent*> zero;
if (ports[idx])
return ports[idx]->expr;
else
return zero;
}
unsigned Module::find_port(const char*name) const
{
assert(name != 0);
for (unsigned idx = 0 ; idx < ports.size() ; idx += 1) {
if (ports[idx] == 0) {
/* It is possible to have undeclared ports. These
are ports that are skipped in the declaration,
for example like so: module foo(x ,, y); The
port between x and y is unnamed and thus
inaccessible to binding by name. */
continue;
}
assert(ports[idx]);
if (ports[idx]->name == name)
return idx;
}
return ports.size();
}
perm_string Module::get_port_name(unsigned idx) const
{
assert(idx < ports.size());
if (ports[idx] == 0 || ports[idx]->name.str() == 0) {
/* It is possible to have undeclared ports. These
are ports that are skipped in the declaration,
for example like so: module foo(x ,, y); The
port between x and y is unnamed and thus
inaccessible to binding by name. Port references
that aren't simple or escaped identifiers are
also inaccessible to binding by name. */
return perm_string::literal("unnamed");
}
return ports[idx]->name;
}
PExpr* Module::get_port_default_value(unsigned idx) const
{
assert(idx < ports.size());
return ports[idx] ? ports[idx]->default_value : 0;
}
PGate* Module::get_gate(perm_string name)
{
for (list<PGate*>::iterator cur = gates_.begin()
; cur != gates_.end() ; ++ cur ) {
if ((*cur)->get_name() == name)
return *cur;
}
return 0;
}
const list<PGate*>& Module::get_gates() const
{
return gates_;
}
PNamedItem::SymbolType Module::symbol_type() const
{
if (program_block)
return PROGRAM;
if (is_interface)
return INTERFACE;
return MODULE;
}
bool Module::can_be_toplevel() const
{
// Don't choose library modules.
if (library_flag)
return false;
// Don't choose modules with parameters without default value
for (std::map<perm_string,param_expr_t*>::const_iterator cur =
parameters.begin(); cur != parameters.end(); cur++) {
if (cur->second->expr == 0)
return false;
}
return true;
}
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