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Add algorithm for choosing nexus name from attached signals.

This commit is contained in:
steve 1999-11-17 18:52:09 +00:00
parent 477495c648
commit 33946e188c
1 changed files with 57 additions and 31 deletions
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88
t-xnf.cc
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@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: t-xnf.cc,v 1.16 1999/11/17 01:31:28 steve Exp $"
#ident "$Id: t-xnf.cc,v 1.17 1999/11/17 18:52:09 steve Exp $"
#endif
/* XNF BACKEND
@ -70,6 +70,7 @@
# include "netlist.h"
# include "target.h"
# include <fstream>
# include <strstream>
class target_xnf : public target_t {
@ -89,6 +90,7 @@ class target_xnf : public target_t {
private:
static string mangle(const string&);
static string choose_sig_name(const NetObj::Link*lnk);
static void draw_pin(ostream&os, const string&name,
const NetObj::Link&lnk);
static void draw_sym_with_lcaname(ostream&os, string lca,
@ -121,6 +123,52 @@ string target_xnf::mangle(const string&name)
return result;
}
/*
* This method takes a signal and pin number as a nexus. Scan the
* nexus to decide which name to use if there are lots of attached
* signals.
*/
string target_xnf::choose_sig_name(const NetObj::Link*lnk)
{
const NetNet*sig = dynamic_cast<const NetNet*>(lnk->get_obj());
unsigned pin = lnk->get_pin();
for (const NetObj::Link*cur = lnk->next_link()
; cur != lnk ; cur = cur->next_link()) {
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->local_flag() && !sig->local_flag())
continue;
if (cursig->name() < sig->name())
continue;
sig = cursig;
pin = cur->get_pin();
}
assert(sig);
ostrstream tmp;
tmp << mangle(sig->name());
if (sig->pin_count() > 1)
tmp << "<" << pin << ">";
tmp << ends;
return tmp.str();
}
void target_xnf::draw_pin(ostream&os, const string&name,
const NetObj::Link&lnk)
{
@ -141,26 +189,11 @@ void target_xnf::draw_pin(ostream&os, const string&name,
type = 'O';
break;
}
unsigned cpin;
const NetObj*cur;
for (lnk.next_link(cur, cpin)
; cur->pin(cpin) != lnk
; cur->pin(cpin).next_link(cur, cpin)) {
const NetNet*sig = dynamic_cast<const NetNet*>(cur);
if (sig) {
os << " PIN, " << use_name << ", " << type << ", "
<< mangle(sig->name());
if (sig->pin_count() > 1)
os << "<" << cpin << ">";
if (inv)
os << ",,INV";
os << endl;
}
}
os << " PIN, " << use_name << ", " << type << ", " <<
choose_sig_name(&lnk);
if (inv) os << ",,INV";
os << endl;
}
static string scrape_pin_name(string&list)
@ -506,18 +539,8 @@ void target_xnf::net_const(ostream&os, const NetConst*c)
// find a way to make a method out of this.
unsigned cpin;
const NetObj*cur;
for (lnk.next_link(cur, cpin)
; cur->pin(cpin) != lnk
; cur->pin(cpin).next_link(cur, cpin)) {
const NetNet*sig = dynamic_cast<const NetNet*>(cur);
if (sig) {
os << "PWR, " << v << ", " << mangle(sig->name());
if (sig->pin_count() > 1)
os << "<" << cpin << ">";
os << endl;
}
}
os << " PWR, " << v << ", " << choose_sig_name(&lnk) << endl;
}
/*
@ -615,6 +638,9 @@ extern const struct target tgt_xnf = { "xnf", &target_xnf_obj };
/*
* $Log: t-xnf.cc,v $
* Revision 1.17 1999/11/17 18:52:09 steve
* Add algorithm for choosing nexus name from attached signals.
*
* Revision 1.16 1999/11/17 01:31:28 steve
* Clean up warnings that add_sub got from Alliance
*