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/*
* Copyright (c) 2000 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
*/
#if !defined(WINNT) && !defined(macintosh)
#ident "$Id: net_link.cc,v 1.4 2000/10/06 23:46:50 steve Exp $"
#endif
# include "netlist.h"
# include <strstream>
# include <string>
# include <typeinfo>
void connect(Link&l, Link&r)
{
assert(&l != &r);
assert(l.nexus_);
assert(r.nexus_);
/* If the links are already connected, then we're done. */
if (l.nexus_ == r.nexus_)
return;
Nexus*tmp = r.nexus_;
while (Link*cur = tmp->first_nlink()) {
tmp->unlink(cur);
l.nexus_->relink(cur);
}
assert(tmp->list_ == 0);
assert(l.is_linked(r));
delete tmp;
}
Link::Link()
: dir_(PASSIVE), drive0_(STRONG), drive1_(STRONG), init_(verinum::Vx),
inst_(0), next_(0), nexus_(0)
{
(new Nexus()) -> relink(this);
}
Link::~Link()
{
assert(nexus_);
Nexus*tmp = nexus_;
nexus_->unlink(this);
if (tmp->list_ == 0)
delete tmp;
}
Nexus* Link::nexus()
{
return nexus_;
}
const Nexus* Link::nexus() const
{
return nexus_;
}
void Link::set_dir(DIR d)
{
dir_ = d;
}
Link::DIR Link::get_dir() const
{
return dir_;
}
void Link::drive0(Link::strength_t str)
{
drive0_ = str;
}
void Link::drive1(Link::strength_t str)
{
drive1_ = str;
}
Link::strength_t Link::drive0() const
{
return drive0_;
}
Link::strength_t Link::drive1() const
{
return drive1_;
}
void Link::set_init(verinum::V val)
{
init_ = val;
}
verinum::V Link::get_init() const
{
return init_;
}
void Link::cur_link(NetObj*&net, unsigned &pin)
{
net = node_;
pin = pin_;
}
void Link::cur_link(const NetObj*&net, unsigned &pin) const
{
net = node_;
pin = pin_;
}
void Link::unlink()
{
assert(nexus_);
if (! is_linked())
return;
nexus_->unlink(this);
(new Nexus()) -> relink(this);
}
bool Link::is_equal(const Link&that) const
{
return (node_ == that.node_) && (pin_ == that.pin_);
}
bool Link::is_linked() const
{
if (next_)
return true;
if (nexus_->first_nlink() != this)
return true;
return false;
}
bool Link::is_linked(const Link&that) const
{
return nexus_ == that.nexus_;
}
Link* Link::next_nlink()
{
return next_;
}
const Link* Link::next_nlink() const
{
return next_;
}
const NetObj*Link::get_obj() const
{
return node_;
}
NetObj*Link::get_obj()
{
return node_;
}
unsigned Link::get_pin() const
{
return pin_;
}
void Link::set_name(const string&n, unsigned i)
{
name_ = n;
inst_ = i;
}
const string& Link::get_name() const
{
return name_;
}
unsigned Link::get_inst() const
{
return inst_;
}
Nexus::Nexus()
{
name_ = 0;
list_ = 0;
t_cookie_ = 0;
}
Nexus::~Nexus()
{
assert(list_ == 0);
if (name_)
delete[]name_;
}
verinum::V Nexus::get_init() const
{
assert(list_);
for (Link*cur = list_ ; cur ; cur = cur->next_) {
if (cur->get_dir() == Link::OUTPUT)
return verinum::Vx;
if ((cur->get_dir() == Link::PASSIVE)
&& (cur->get_init() != verinum::Vz))
return cur->get_init();
}
return verinum::Vz;
}
void Nexus::unlink(Link*that)
{
if (name_) {
delete[] name_;
name_ = 0;
}
assert(that);
if (list_ == that) {
list_ = that->next_;
that->next_ = 0;
that->nexus_ = 0;
return;
}
Link*cur = list_;
while (cur->next_ != that) {
assert(cur->next_);
cur = cur->next_;
}
cur->next_ = that->next_;
that->nexus_ = 0;
that->next_ = 0;
}
void Nexus::relink(Link*that)
{
if (name_) {
delete[] name_;
name_ = 0;
}
assert(that->nexus_ == 0);
assert(that->next_ == 0);
that->next_ = list_;
that->nexus_ = this;
list_ = that;
}
Link* Nexus::first_nlink()
{
return list_;
}
const Link* Nexus::first_nlink() const
{
return list_;
}
void* Nexus::t_cookie() const
{
return t_cookie_;
}
void* Nexus::t_cookie(void*val)const
{
void*tmp = t_cookie_;
t_cookie_ = val;
return tmp;
}
const char* Nexus::name() const
{
if (name_)
return name_;
const NetNet*sig = 0;
unsigned pin = 0;
for (const Link*cur = first_nlink()
; cur ; cur = cur->next_nlink()) {
const NetNet*cursig = dynamic_cast<const NetNet*>(cur->get_obj());
if (cursig == 0)
continue;
if (sig == 0) {
sig = cursig;
pin = cur->get_pin();
continue;
}
if ((cursig->pin_count() == 1) && (sig->pin_count() > 1))
continue;
if ((cursig->pin_count() > 1) && (sig->pin_count() == 1)) {
sig = cursig;
pin = cur->get_pin();
continue;
}
if (cursig->local_flag() && !sig->local_flag())
continue;
if (cursig->name() < sig->name())
continue;
sig = cursig;
pin = cur->get_pin();
}
if (sig == 0) {
const Link*lnk = first_nlink();
const NetObj*obj = lnk->get_obj();
pin = lnk->get_pin();
cerr << "internal error: No signal for nexus of " <<
obj->name() << " pin " << pin << "(" <<
lnk->get_name() << "<" << lnk->get_inst() << ">)"
" type=" << typeid(*obj).name() << "?" << endl;
}
assert(sig);
ostrstream tmp;
tmp << sig->name();
if (sig->pin_count() > 1)
tmp << "<" << pin << ">";
tmp << ends;
name_ = new char[strlen(tmp.str()) + 1];
strcpy(name_, tmp.str());
return name_;
}
/*
* $Log: net_link.cc,v $
* Revision 1.4 2000/10/06 23:46:50 steve
* ivl_target updates, including more complete
* handling of ivl_nexus_t objects. Much reduced
* dependencies on pointers to netlist objects.
*
* Revision 1.3 2000/08/26 00:54:03 steve
* Get at gate information for ivl_target interface.
*
* Revision 1.2 2000/07/14 06:12:57 steve
* Move inital value handling from NetNet to Nexus
* objects. This allows better propogation of inital
* values.
*
* Clean up constant propagation a bit to account
* for regs that are not really values.
*
* Revision 1.1 2000/06/25 19:59:42 steve
* Redesign Links to include the Nexus class that
* carries properties of the connected set of links.
*
*/
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