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/*
* Copyright (c) 2000-2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
# include "config.h"
# include <iostream>
# include "netlist.h"
# include <sstream>
# include <cstring>
# include <string>
# include <typeinfo>
# include <cstdlib>
# include "ivl_alloc.h"
void Nexus::connect(Link&r)
{
Nexus*r_nexus = r.next_? r.find_nexus_() : 0;
if (this == r_nexus)
return;
delete[] name_;
name_ = 0;
// Special case: This nexus is empty. Simply copy all the
// links of the other nexus to this one, and delete the old
// nexus.
if (list_ == 0) {
if (r.next_ == 0) {
list_ = &r;
r.next_ = &r;
r.nexus_ = this;
driven_ = NO_GUESS;
} else {
driven_ = r_nexus->driven_;
list_ = r_nexus->list_;
list_->nexus_ = this;
r_nexus->list_ = 0;
delete r_nexus;
}
return;
}
// Special case: The Link is unconnected. Put it at the end of
// the current list and move the list_ pointer and nexus_ back
// pointer to suit.
if (r.next_ == 0) {
if (r.get_dir() != Link::INPUT)
driven_ = NO_GUESS;
r.nexus_ = this;
r.next_ = list_->next_;
list_->next_ = &r;
list_->nexus_ = 0;
list_ = &r;
return;
}
if (r_nexus->driven_ != Vz)
driven_ = NO_GUESS;
// Splice the list of links from the "tmp" nexus to the end of
// this nexus. Adjust the nexus pointers as needed.
Link*save_first = list_->next_;
list_->next_ = r_nexus->list_->next_;
r_nexus->list_->next_ = save_first;
list_->nexus_ = 0;
list_ = r_nexus->list_;
list_->nexus_ = this;
r_nexus->list_ = 0;
delete r_nexus;
}
void connect(Link&l, Link&r)
{
assert(&l != &r);
if (l.nexus_ != 0) {
connect(l.nexus_, r);
} else if (r.nexus_ != 0) {
connect(r.nexus_, l);
} else {
Nexus*tmp = new Nexus(l);
tmp->connect(r);
}
}
Link::Link()
: dir_(PASSIVE), drive0_(IVL_DR_STRONG), drive1_(IVL_DR_STRONG),
next_(0), nexus_(0)
{
}
Link::~Link()
{
if (next_) {
Nexus*tmp = nexus();
tmp->unlink(this);
if (tmp->list_ == 0)
delete tmp;
}
}
Nexus* Link::find_nexus_() const
{
assert(next_);
if (nexus_) return nexus_;
for (Link*cur = next_ ; cur != this ; cur = cur->next_) {
if (cur->nexus_) return cur->nexus_;
}
return 0;
}
Nexus* Link::nexus()
{
if (next_ == 0) {
assert(nexus_ == 0);
Nexus*tmp = new Nexus(*this);
return tmp;
}
return find_nexus_();
}
const Nexus* Link::nexus() const
{
if (next_ == 0) return 0;
return find_nexus_();
}
void Link::set_dir(DIR d)
{
dir_ = d;
}
Link::DIR Link::get_dir() const
{
return dir_;
}
void Link::drivers_delays(NetExpr*rise, NetExpr*fall, NetExpr*decay)
{
find_nexus_()->drivers_delays(rise, fall, decay);
}
void Link::drivers_drive(ivl_drive_t drive0__, ivl_drive_t drive1__)
{
find_nexus_()->drivers_drive(drive0__, drive1__);
}
void Link::drive0(ivl_drive_t str)
{
drive0_ = str;
}
void Link::drive1(ivl_drive_t str)
{
drive1_ = str;
}
ivl_drive_t Link::drive0() const
{
return drive0_;
}
ivl_drive_t Link::drive1() const
{
return drive1_;
}
void Link::cur_link(NetPins*&net, unsigned &pin)
{
net = get_obj();
pin = get_pin();
}
void Link::cur_link(const NetPins*&net, unsigned &pin) const
{
net = get_obj();
pin = get_pin();
}
void Link::unlink()
{
if (! is_linked())
return;
find_nexus_()->unlink(this);
}
bool Link::is_equal(const Link&that) const
{
return (get_obj() == that.get_obj()) && (get_pin() == that.get_pin());
}
bool Link::is_linked() const
{
if (next_ == 0)
return false;
if (next_ == this)
return false;
return true;
}
bool Link::is_linked(const Link&that) const
{
if (next_ == 0)
return false;
if (that.next_ == 0)
return false;
const Link*cur = next_;
while (cur != this) {
if (cur == &that) return true;
cur = cur->next_;
}
return false;
}
Nexus::Nexus(Link&that)
{
name_ = 0;
driven_ = NO_GUESS;
t_cookie_ = 0;
if (that.next_ == 0) {
list_ = &that;
that.next_ = &that;
that.nexus_ = this;
driven_ = NO_GUESS;
} else {
Nexus*tmp = that.find_nexus_();
list_ = tmp->list_;
list_->nexus_ = this;
driven_ = tmp->driven_;
name_ = tmp->name_;
tmp->list_ = 0;
tmp->name_ = 0;
delete tmp;
}
}
Nexus::~Nexus()
{
assert(list_ == 0);
delete[] name_;
}
bool Nexus::assign_lval() const
{
for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
const NetPins*obj;
unsigned pin;
cur->cur_link(obj, pin);
const NetNet*net = dynamic_cast<const NetNet*> (obj);
if (net == 0)
continue;
if (net->peek_lref() > 0)
return true;
}
return false;
}
void Nexus::count_io(unsigned&inp, unsigned&out) const
{
for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
switch (cur->get_dir()) {
case Link::INPUT:
inp += 1;
break;
case Link::OUTPUT:
out += 1;
break;
default:
break;
}
}
}
bool Nexus::drivers_present() const
{
for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
if (cur->get_dir() == Link::OUTPUT)
return true;
if (cur->get_dir() == Link::INPUT)
continue;
// Must be PASSIVE, so if it is some kind of net, see if
// it is the sort that might drive the nexus.
const NetPins*obj;
unsigned pin;
cur->cur_link(obj, pin);
if (const NetNet*net = dynamic_cast<const NetNet*>(obj))
switch (net->type()) {
case NetNet::SUPPLY0:
case NetNet::SUPPLY1:
case NetNet::TRI0:
case NetNet::TRI1:
case NetNet::WAND:
case NetNet::WOR:
case NetNet::TRIAND:
case NetNet::TRIOR:
case NetNet::REG:
return true;
default:
break;
}
}
return false;
}
void Nexus::drivers_delays(NetExpr*rise, NetExpr*fall, NetExpr*decay)
{
for (Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
if (cur->get_dir() != Link::OUTPUT)
continue;
NetObj*obj = dynamic_cast<NetObj*>(cur->get_obj());
if (obj == 0)
continue;
obj->rise_time(rise);
obj->fall_time(fall);
obj->decay_time(decay);
}
}
void Nexus::drivers_drive(ivl_drive_t drive0, ivl_drive_t drive1)
{
for (Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
if (cur->get_dir() != Link::OUTPUT)
continue;
cur->drive0(drive0);
cur->drive1(drive1);
}
}
void Nexus::unlink(Link*that)
{
delete[] name_;
name_ = 0;
assert(that);
// Special case: the Link is the only link in the nexus. In
// this case, the unlink is trivial. Also clear the Nexus
// pointers.
if (that->next_ == that) {
assert(that->nexus_ == this);
assert(list_ == that);
list_ = 0;
driven_ = NO_GUESS;
that->nexus_ = 0;
that->next_ = 0;
return;
}
// If the link I'm removing was a driver for this nexus, then
// cancel my guess of the driven value.
if (that->get_dir() != Link::INPUT)
driven_ = NO_GUESS;
// Look for the Link that points to "that". We know that there
// will be one because the list is a circle. When we find the
// prev pointer, then remove that from the list.
Link*prev = list_;
while (prev->next_ != that)
prev = prev->next_;
prev->next_ = that->next_;
// If "that" was the last item in the list, then change the
// list_ pointer to point to the new end of the list.
if (list_ == that) {
assert(that->nexus_ == this);
list_ = prev;
list_->nexus_ = this;
}
that->nexus_ = 0;
that->next_ = 0;
}
Link* Nexus::first_nlink()
{
if (list_) return list_->next_;
else return 0;
}
const Link* Nexus::first_nlink() const
{
if (list_) return list_->next_;
else return 0;
}
/*
* The t_cookie can be set exactly once. This attaches an ivl_nexus_t
* object to the Nexus, and causes the Link list to be marked up for
* efficient use by the code generator. The change is to give all the
* links a valid nexus_ pointer. This breaks most of the other
* methods, but they are not used during code generation.
*/
void Nexus::t_cookie(ivl_nexus_t val) const
{
assert(val && !t_cookie_);
t_cookie_ = val;
for (Link*cur = list_->next_ ; cur->nexus_ == 0 ; cur = cur->next_)
cur->nexus_ = const_cast<Nexus*> (this);
}
unsigned Nexus::vector_width() const
{
for (const Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
const NetNet*sig = dynamic_cast<const NetNet*>(cur->get_obj());
if (sig == 0)
continue;
return sig->vector_width();
}
return 0;
}
NetNet* Nexus::pick_any_net()
{
for (Link*cur = first_nlink() ; cur ; cur = cur->next_nlink()) {
NetNet*sig = dynamic_cast<NetNet*>(cur->get_obj());
if (sig != 0)
return sig;
}
return 0;
}
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 = dynamic_cast<const NetObj*>(lnk->get_obj());
pin = lnk->get_pin();
cerr << "internal error: No signal for nexus of "
<< obj->name() << " pin " << pin
<< " type=" << typeid(*obj).name() << "?" << endl;
}
assert(sig);
ostringstream tmp;
tmp << scope_path(sig->scope()) << "." << sig->name();
if (sig->pin_count() > 1)
tmp << "<" << pin << ">";
const string tmps = tmp.str();
name_ = new char[strlen(tmps.c_str()) + 1];
strcpy(name_, tmps.c_str());
return name_;
}
NexusSet::NexusSet()
{
items_ = 0;
nitems_ = 0;
}
NexusSet::~NexusSet()
{
if (nitems_ > 0) {
assert(items_ != 0);
free(items_);
} else {
assert(items_ == 0);
}
}
unsigned NexusSet::count() const
{
return nitems_;
}
void NexusSet::add(Nexus*that)
{
assert(that);
if (nitems_ == 0) {
assert(items_ == 0);
items_ = (Nexus**)malloc(sizeof(Nexus*));
items_[0] = that;
nitems_ = 1;
return;
}
unsigned ptr = bsearch_(that);
if (ptr < nitems_) {
assert(items_[ptr] == that);
return;
}
assert(ptr == nitems_);
items_ = (Nexus**)realloc(items_, (nitems_+1) * sizeof(Nexus*));
items_[ptr] = that;
nitems_ += 1;
}
void NexusSet::add(const NexusSet&that)
{
for (unsigned idx = 0 ; idx < that.nitems_ ; idx += 1)
add(that.items_[idx]);
}
void NexusSet::rem(Nexus*that)
{
assert(that);
if (nitems_ == 0)
return;
unsigned ptr = bsearch_(that);
if (ptr >= nitems_)
return;
if (nitems_ == 1) {
free(items_);
items_ = 0;
nitems_ = 0;
return;
}
for (unsigned idx = ptr ; idx < (nitems_-1) ; idx += 1)
items_[idx] = items_[idx+1];
items_ = (Nexus**)realloc(items_, (nitems_-1) * sizeof(Nexus*));
nitems_ -= 1;
}
void NexusSet::rem(const NexusSet&that)
{
for (unsigned idx = 0 ; idx < that.nitems_ ; idx += 1)
rem(that.items_[idx]);
}
Nexus* NexusSet::operator[] (unsigned idx) const
{
assert(idx < nitems_);
return items_[idx];
}
unsigned NexusSet::bsearch_(Nexus*that) const
{
for (unsigned idx = 0 ; idx < nitems_ ; idx += 1) {
if (items_[idx] == that)
return idx;
}
return nitems_;
}
bool NexusSet::contains(const NexusSet&that) const
{
for (unsigned idx = 0 ; idx < that.nitems_ ; idx += 1) {
unsigned where = bsearch_(that[idx]);
if (where == nitems_)
return false;
if (items_[where] != that[idx])
return false;
}
return true;
}
bool NexusSet::intersect(const NexusSet&that) const
{
for (unsigned idx = 0 ; idx < that.nitems_ ; idx += 1) {
unsigned where = bsearch_(that[idx]);
if (where == nitems_)
continue;
if (items_[where] == that[idx])
return true;
}
return false;
}
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