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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
# include "config.h"
# include "compiler.h"
# include "netlist.h"
/*
* NOTE: The name_ is perm-allocated by the caller.
*/
NetEvent::NetEvent(perm_string n)
: name_(n)
{
scope_ = 0;
snext_ = 0;
probes_ = 0;
trig_ = 0;
waitref_ = 0;
exprref_ = 0;
wlist_ = 0;
}
NetEvent::~NetEvent()
{
assert(waitref_ == 0);
if (scope_) scope_->rem_event(this);
while (probes_) {
NetEvProbe*tmp = probes_->enext_;
delete probes_;
probes_ = tmp;
}
/* name_ is lex_strings. */
}
perm_string NetEvent::name() const
{
return name_;
}
NetScope* NetEvent::scope()
{
assert(scope_);
return scope_;
}
const NetScope* NetEvent::scope() const
{
assert(scope_);
return scope_;
}
unsigned NetEvent::nprobe() const
{
unsigned cnt = 0;
NetEvProbe*cur = probes_;
while (cur) {
cnt += 1;
cur = cur->enext_;
}
return cnt;
}
NetEvProbe* NetEvent::probe(unsigned idx)
{
NetEvProbe*cur = probes_;
while (cur && idx) {
cur = cur->enext_;
idx -= 1;
}
return cur;
}
const NetEvProbe* NetEvent::probe(unsigned idx) const
{
NetEvProbe*cur = probes_;
while (cur && idx) {
cur = cur->enext_;
idx -= 1;
}
return cur;
}
unsigned NetEvent::ntrig() const
{
unsigned cnt = 0;
NetEvTrig*cur = trig_;
while (cur) {
cnt += 1;
cur = cur->enext_;
}
return cnt;
}
unsigned NetEvent::nwait() const
{
return waitref_;
}
unsigned NetEvent::nexpr() const
{
return exprref_;
}
/*
* A "similar" event is one that has an identical non-nil set of
* probes.
*/
void NetEvent::find_similar_event(list<NetEvent*>&event_list)
{
if (probes_ == 0)
return;
set<NetEvent*> candidate_events;
/* First, get a list of all the NetEvProbes that are connected
to my first probe. Then use that to create a set of
candidate events. These candidate events are a superset of
the similar events, so I will be culling this list later. */
list<NetEvProbe*>first_probes;
probes_->find_similar_probes(first_probes);
for (list<NetEvProbe*>::iterator idx = first_probes.begin()
; idx != first_probes.end() ; ++ idx ) {
candidate_events.insert( (*idx)->event() );
}
if (candidate_events.empty())
return;
/* Now scan the remaining probes, in each case checking that
the probe event is a candidate event. After each iteration,
events that don't have a similar probe will be removed from
the candidate_events set. If the candidate_events set
becomes empty, then give up. */
unsigned probe_count = 1;
for (NetEvProbe*cur = probes_->enext_ ; cur; cur = cur->enext_) {
list<NetEvProbe*>similar_probes;
cur->find_similar_probes(similar_probes);
set<NetEvent*> candidate_tmp;
for (list<NetEvProbe*>::iterator idx = similar_probes.begin()
; idx != similar_probes.end() ; ++ idx ) {
NetEvent*tmp = (*idx)->event();
if (candidate_events.find(tmp) != candidate_events.end())
candidate_tmp .insert(tmp);
}
// None of the candidate events match this probe? Give up!
if (candidate_tmp.empty())
return;
candidate_events = candidate_tmp;
probe_count += 1;
}
/* Scan the surviving candidate events. We know that they all
have probes that match the current event's probes. Check
for remaining compatibility details and save the survivors
in the event_list that the caller passed. */
for (set<NetEvent*>::iterator idx = candidate_events.begin()
; idx != candidate_events.end() ; ++ idx ) {
NetEvent*tmp = *idx;
// This shouldn't be possible?
if (tmp == this)
continue;
/* For automatic tasks, the VVP runtime holds state for events
in the automatically allocated context. This means we can't
merge similar events in different automatic tasks. */
if (scope()->is_auto() && (tmp->scope() != scope()))
continue;
unsigned tcnt = 0;
for (NetEvProbe*cur = tmp->probes_ ; cur ; cur = cur->enext_)
tcnt += 1;
if (tcnt == probe_count)
event_list .push_back(tmp);
}
}
void NetEvent::replace_event(NetEvent*that)
{
while (wlist_) {
wlist_->obj->replace_event(this, that);
}
}
NexusSet* NetEvent::nex_async_()
{
/* If there are behavioral trigger statements attached to me,
then this is not an asynchronous event. */
if (trig_ != 0)
return 0;
NexusSet*tmp = new NexusSet;
for (NetEvProbe*cur = probes_ ; cur != 0 ; cur = cur->enext_) {
if (cur->edge() != NetEvProbe::ANYEDGE) {
delete tmp;
return 0;
}
for (unsigned idx = 0 ; idx < cur->pin_count() ; idx += 1)
tmp->add(cur->pin(idx).nexus());
}
return tmp;
}
NetEvTrig::NetEvTrig(NetEvent*ev)
: event_(ev)
{
enext_ = event_->trig_;
event_->trig_ = this;
}
NetEvTrig::~NetEvTrig()
{
if (event_->trig_ == this) {
event_->trig_ = enext_;
} else {
NetEvTrig*cur = event_->trig_;
while (cur->enext_ != this) {
assert(cur->enext_);
cur = cur->enext_;
}
cur->enext_ = this->enext_;
}
}
const NetEvent* NetEvTrig::event() const
{
return event_;
}
NetEvProbe::NetEvProbe(NetScope*s, perm_string n, NetEvent*tgt,
edge_t t, unsigned p)
: NetNode(s, n, p), event_(tgt), edge_(t)
{
for (unsigned idx = 0 ; idx < p ; idx += 1) {
pin(idx).set_dir(Link::INPUT);
}
enext_ = event_->probes_;
event_->probes_ = this;
}
NetEvProbe::~NetEvProbe()
{
if (event_->probes_ == this) {
event_->probes_ = enext_;
} else {
NetEvProbe*cur = event_->probes_;
while (cur->enext_ != this) {
assert(cur->enext_);
cur = cur->enext_;
}
cur->enext_ = this->enext_;
}
}
NetEvProbe::edge_t NetEvProbe::edge() const
{
return edge_;
}
NetEvent* NetEvProbe::event()
{
return event_;
}
const NetEvent* NetEvProbe::event() const
{
return event_;
}
/*
* A similar NetEvProbe is one that is connected to all the same nexa
* that this probe is connected to, and also is the same edge
* type. Don't count myself as a similar probe.
*/
void NetEvProbe::find_similar_probes(list<NetEvProbe*>&plist)
{
Nexus*nex = pin(0).nexus();
for (Link*lcur = nex->first_nlink(); lcur; lcur = lcur->next_nlink()) {
NetPins*obj = lcur->get_obj();
if (obj->pin_count() != pin_count())
continue;
NetEvProbe*tmp = dynamic_cast<NetEvProbe*>(obj);
if (tmp == 0)
continue;
if (tmp == this)
continue;
if (edge() != tmp->edge())
continue;
bool ok_flag = true;
for (unsigned idx = 1 ; ok_flag && idx < pin_count() ; idx += 1)
if (! pin(idx).is_linked(tmp->pin(idx)))
ok_flag = false;
if (ok_flag == true)
plist .push_back(tmp);
}
}
NetEvWait::NetEvWait(NetProc*pr)
: statement_(pr), nevents_(0), events_(0)
{
}
NetEvWait::~NetEvWait()
{
if (events_) {
for (unsigned idx = 0 ; idx < nevents_ ; idx += 1) {
NetEvent*tgt = events_[idx];
tgt->waitref_ -= 1;
struct NetEvent::wcell_*tmp = tgt->wlist_;
if (tmp->obj == this) {
tgt->wlist_ = tmp->next;
delete tmp;
} else {
assert(tmp->next);
while (tmp->next->obj != this) {
tmp = tmp->next;
assert(tmp->next);
}
tmp->next = tmp->next->next;
delete tmp;
}
}
delete[]events_;
}
delete statement_;
}
void NetEvWait::add_event(NetEvent*tgt)
{
assert(tgt);
if (nevents_ == 0) {
events_ = new NetEvent*[1];
} else {
NetEvent**tmp = new NetEvent*[nevents_+1];
for (unsigned idx = 0 ; idx < nevents_ ; idx += 1) {
tmp[idx] = events_[idx];
assert(tmp[idx] != tgt);
}
delete[]events_;
events_ = tmp;
}
events_[nevents_] = tgt;
nevents_ += 1;
// Remember to tell the NetEvent that there is someone
// pointing to it.
tgt->waitref_ += 1;
struct NetEvent::wcell_*tmp = new NetEvent::wcell_;
tmp->obj = this;
tmp->next = tgt->wlist_;
tgt->wlist_ = tmp;
}
void NetEvWait::replace_event(NetEvent*src, NetEvent*repl)
{
unsigned idx;
for (idx = 0 ; idx < nevents_ ; idx += 1) {
if (events_[idx] == src)
break;
}
assert(idx < nevents_);
/* First, remove me from the list held by the src NetEvent. */
assert(src->waitref_ > 0);
src->waitref_ -= 1;
struct NetEvent::wcell_*tmp = src->wlist_;
if (tmp->obj == this) {
src->wlist_ = tmp->next;
delete tmp;
} else {
assert(tmp->next);
while (tmp->next->obj != this) {
tmp = tmp->next;
assert(tmp->next);
}
tmp->next = tmp->next->next;
delete tmp;
}
events_[idx] = repl;
// Remember to tell the replacement NetEvent that there is
// someone pointing to it.
repl->waitref_ += 1;
tmp = new NetEvent::wcell_;
tmp->obj = this;
tmp->next = repl->wlist_;
repl->wlist_ = tmp;
}
unsigned NetEvWait::nevents() const
{
return nevents_;
}
const NetEvent* NetEvWait::event(unsigned idx) const
{
assert(idx < nevents_);
return events_[idx];
}
NetEvent* NetEvWait::event(unsigned idx)
{
assert(idx < nevents_);
return events_[idx];
}
NetProc* NetEvWait::statement()
{
return statement_;
}
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