/
design_dump.cc
1186 lines (1060 loc) · 28.7 KB
/
design_dump.cc
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/*
* Copyright (c) 1998-2000 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: design_dump.cc,v 1.124 2002/05/26 01:39:02 steve Exp $"
#endif
# include "config.h"
/*
* This file contains all the dump methods of the netlist classes.
*/
# include <typeinfo>
# include <iostream>
# include <iomanip>
# include "netlist.h"
static ostream& operator<< (ostream&o, NetBlock::Type t)
{
switch (t) {
case NetBlock::SEQU:
o << "begin";
break;
case NetBlock::PARA:
o << "fork";
break;
}
return o;
}
ostream& operator << (ostream&o, Link::strength_t str)
{
switch (str) {
case Link::HIGHZ:
o << "highz";
break;
case Link::WEAK:
o << "weak";
break;
case Link::PULL:
o << "pull";
break;
case Link::STRONG:
o << "strong";
break;
case Link::SUPPLY:
o << "supply";
break;
default:
assert(0);
}
return o;
}
/* Dump a net. This can be a wire or register. */
void NetNet::dump_net(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << type() << ": " << name() << "[" <<
pin_count() << "]";
if (local_flag_)
o << " (local)";
if (signed_)
o << " signed";
switch (port_type_) {
case NetNet::NOT_A_PORT:
break;
case NetNet::PIMPLICIT:
o << " implicit-port?";
break;
case NetNet::PINPUT:
o << " input";
break;
case NetNet::POUTPUT:
o << " output";
break;
case NetNet::PINOUT:
o << " inout";
break;
}
o << " (eref=" << peek_eref() << ", lref=" << peek_lref() << ")";
if (scope())
o << " scope=" << scope()->name();
o << " #(" << rise_time() << "," << fall_time() << "," <<
decay_time() << ") init=";
for (unsigned idx = pin_count() ; idx > 0 ; idx -= 1)
o << pin(idx-1).get_init();
o << " (";
for (unsigned idx = pin_count() ; idx > 0 ; idx -= 1)
o << pin(idx-1).nexus()->get_init();
o << ")" << endl;
for (unsigned idx = 0 ; idx < pin_count() ; idx += 1) {
if (! pin(idx).is_linked())
continue;
const Nexus*nex = pin(idx).nexus();
o << setw(ind+4) << "" << "[" << idx << "]: " << nex
<< " " << nex->name() << endl;
}
dump_obj_attr(o, ind+4);
}
void NetMemory::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << name_ << "[" << width_ << "] " <<
"[" << idxh_ << ":" << idxl_ << "]" << endl;
}
/* Dump a NetNode and its pins. Dump what I know about the netnode on
the first line, then list all the pins, with the name of the
connected signal. */
void NetNode::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "node: ";
o << typeid(*this).name() << " #(" << rise_time()
<< "," << fall_time() << "," << decay_time() << ") " << name()
<< endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
/* This is the generic dumping of all the signals connected to each
pin of the object. The "this" object is not printed, only the
signals connected to this. */
void NetObj::dump_node_pins(ostream&o, unsigned ind) const
{
for (unsigned idx = 0 ; idx < pin_count() ; idx += 1) {
o << setw(ind) << "" << idx << " " << pin(idx).get_name()
<< "<" << pin(idx).get_inst() << ">";
switch (pin(idx).get_dir()) {
case Link::PASSIVE:
o << " p";
break;
case Link::INPUT:
o << " I";
break;
case Link::OUTPUT:
o << " O";
break;
}
o << " (" << pin(idx).drive0() << "0 "
<< pin(idx).drive1() << "1): ";
if (pin(idx).is_linked()) {
const Nexus*nex = pin(idx).nexus();
o << nex << " " << nex->name();
}
o << endl;
}
}
void NetObj::dump_obj_attr(ostream&o, unsigned ind) const
{
unsigned idx;
for (idx = 0 ; idx < attr_cnt() ; idx += 1) {
o << setw(ind) << "" << attr_key(idx) << " = \"" <<
attr_value(idx) << "\"" << endl;
}
}
void NetAddSub::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "Adder (NetAddSub): " << name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetCAssign::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "Procedural continuous assign (NetCAssign): "
<< name() << endl;
dump_node_pins(o, ind+4);
}
void NetCLShift::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "Combinatorial shift (NetCLShift): " <<
name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetCompare::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "LPM_COMPARE (NetCompare): " << name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetDivide::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "NET_DIVIDE (NetDivide): " << name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetForce::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "force " << lval_->name() << endl;
dump_node_pins(o, ind+4);
}
void NetMult::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "LPM_MULT (NetMult): " << name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetMux::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "Multiplexer (NetMux): " << name()
<< " scope=" << scope()->name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetBUFZ::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "NetBUFZ: " << name()
<< " scope=" << (scope()? scope()->name() : "")
<< " delay=(" << rise_time() << "," << fall_time() << "," <<
decay_time() << ")" << endl;
dump_node_pins(o, ind+4);
}
void NetCaseCmp::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "case compare === : " << name() << endl;
dump_node_pins(o, ind+4);
}
void NetConst::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "constant ";
for (unsigned idx = pin_count() ; idx > 0 ; idx -= 1)
o << value_[idx-1];
o << ": " << name() << endl;
dump_node_pins(o, ind+4);
}
void NetFF::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "LPM_FF: " << name()
<< " scope=" << (scope()? scope()->name() : "") << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetLogic::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "logic: ";
switch (type_) {
case AND:
o << "and";
break;
case BUF:
o << "buf";
break;
case BUFIF0:
o << "bufif0";
break;
case BUFIF1:
o << "bufif1";
break;
case NAND:
o << "nand";
break;
case NMOS:
o << "nmos";
break;
case NOR:
o << "nor";
break;
case NOT:
o << "not";
break;
case NOTIF0:
o << "notif0";
break;
case NOTIF1:
o << "notif1";
break;
case OR:
o << "or";
break;
case PULLDOWN:
o << "pulldown";
break;
case PULLUP:
o << "pullup";
break;
case RNMOS:
o << "rnmos";
break;
case RPMOS:
o << "rpmos";
break;
case PMOS:
o << "pmos";
break;
case XNOR:
o << "xnor";
break;
case XOR:
o << "xor";
break;
}
o << " #(" << rise_time()
<< "," << fall_time() << "," << decay_time() << ") " << name()
<< " scope=" << (scope()? scope()->name() : "")
<< endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetModulo::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "NET_MODULO (NetModulo): " << name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetRamDq::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "LPM_RAM_DQ (" << mem_->name() << "): "
<< name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetUserFunc::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << def_->name() << "(";
o << ")" << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetTaskDef::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "task " << name_ << ";" << endl;
for (unsigned idx = 0 ; idx < ports_.count() ; idx += 1) {
o << setw(ind+4) << "";
assert(ports_[idx]);
switch (ports_[idx]->port_type()) {
case NetNet::PINPUT:
o << "input ";
break;
case NetNet::POUTPUT:
o << "output ";
break;
case NetNet::PINOUT:
o << "input ";
break;
default:
o << "NOT_A_PORT ";
break;
}
o << ports_[idx]->name() << ";" << endl;
}
proc_->dump(o, ind+4);
o << setw(ind) << "" << "endtask" << endl;
}
void NetUDP::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "UDP (" << udp_name() << "): ";
o << " #(" << rise_time() << "," << fall_time() << "," << decay_time() <<
") " << name() << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetProcTop::dump(ostream&o, unsigned ind) const
{
switch (type_) {
case NetProcTop::KINITIAL:
o << "initial /* " << get_line() << " in "
<< scope_->name() << " */" << endl;
break;
case NetProcTop::KALWAYS:
o << "always /* " << get_line() << " in "
<< scope_->name() << " */" << endl;
break;
}
for (unsigned idx = 0 ; idx < attr_cnt() ; idx += 1) {
o << setw(ind+2) << "" << "(* " << attr_key(idx) << " = "
<< attr_value(idx) << " *)" << endl;
}
statement_->dump(o, ind+2);
}
void NetAssign_::dump_lval(ostream&o) const
{
if (sig_) {
o << sig_->name();
if (bmux_) {
o << "[" << *bmux_ << "]";
} else {
o << "[" << (loff_+lwid_-1) << ":" << loff_ << "]";
}
} else {
o << "";
}
}
void NetAssignBase::dump_lval(ostream&o) const
{
o << "{";
lval_->dump_lval(o);
for (NetAssign_*cur = lval_->more ; cur ; cur = cur->more) {
o << ", ";
cur->dump_lval(o);
}
o << "}";
}
/* Dump an assignment statement */
void NetAssign::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "";
dump_lval(o);
o << " = ";
#if 0
if (l_val(0)->rise_time())
o << "#" << l_val(0)->rise_time() << " ";
#endif
o << *rval() << ";" << endl;
}
void NetAssignNB::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "";
dump_lval(o);
o << " <= ";
#if 0
if (l_val(0)->rise_time())
o << "#" << l_val(0)->rise_time() << " ";
#endif
o << *rval() << ";" << endl;
}
void NetAssignMem::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "";
o << "/* " << get_line() << " */" << endl;
o << setw(ind) << "";
o << memory()->name() << "[" << *index() << "] = ";
rval()->dump(o);
o << ";" << endl;
}
void NetAssignMemNB::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "";
o << "/* " << get_line() << " */" << endl;
o << setw(ind) << "";
o << memory()->name() << "[" << *index() << "] <= ";
rval()->dump(o);
o << ";" << endl;
}
/* Dump a block statement */
void NetBlock::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << type_ << endl;
if (last_) {
const NetProc*cur = last_;
do {
cur = cur->next_;
cur->dump(o, ind+4);
} while (cur != last_);
}
o << setw(ind) << "" << "end" << endl;
}
void NetCase::dump(ostream&o, unsigned ind) const
{
switch (type_) {
case EQ:
o << setw(ind) << "" << "case (" << *expr_ << ")" << endl;
break;
case EQX:
o << setw(ind) << "" << "casex (" << *expr_ << ")" << endl;
break;
case EQZ:
o << setw(ind) << "" << "casez (" << *expr_ << ")" << endl;
break;
}
for (unsigned idx = 0 ; idx < nitems_ ; idx += 1) {
o << setw(ind+2) << "";
if (items_[idx].guard)
o << *items_[idx].guard << ":";
else
o << "default:";
if (items_[idx].statement) {
o << endl;
items_[idx].statement->dump(o, ind+6);
} else {
o << " ;" << endl;
}
}
o << setw(ind) << "" << "endcase" << endl;
}
void NetCAssign::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "cassign " << lval_->name() << " = "
<< name() << ";" << endl;
}
void NetCondit::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "if (";
expr_->dump(o);
o << ")" << endl;
if (if_) if_->dump(o, ind+4);
else o << setw(ind+4) << "" << "/* empty */ ;" << endl;
if (else_) {
o << setw(ind) << "" << "else" << endl;
else_->dump(o, ind+4);
}
}
void NetDeassign::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "deassign " << lval_->name() << "; "
<< "/* " << get_line() << " */" << endl;
}
void NetDisable::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "disable " << target_->name() << "; "
<< "/* " << get_line() << " */" << endl;
}
void NetEvProbe::dump_node(ostream&o, unsigned ind) const
{
o << setw(ind) << "";
switch (edge_) {
case ANYEDGE:
o << "anyedge ";
break;
case POSEDGE:
o << "posedge ";
break;
case NEGEDGE:
o << "negedge ";
break;
}
o << setw(ind) << "" << "-> " << event_->full_name() << "; " << endl;
dump_node_pins(o, ind+4);
dump_obj_attr(o, ind+4);
}
void NetEvTrig::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "-> " << event_->name() << "; "
<< "// " << get_line() << endl;
}
void NetEvWait::dump(ostream&o, unsigned ind) const
{
assert(nevents() > 0);
o << setw(ind) <<"" << "@(" << event(0)->full_name();
for (unsigned idx = 1 ; idx < nevents() ; idx += 1)
o << " or " << event(idx)->full_name();
o << ") // " << get_line() << endl;
if (statement_)
statement_->dump(o, ind+2);
else
o << setw(ind+2) << "" << "/* noop */ ;" << endl;
}
void NetForce::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "force " << lval_->name() << " = "
<< name() << ";" << endl;
}
void NetForever::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "forever" << endl;
statement_->dump(o, ind+2);
}
void NetFuncDef::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "function " << scope_->name() << endl;
if (statement_)
statement_->dump(o, ind+2);
else
o << setw(ind+2) << "" << "// NO STATEMENT" << endl;
}
void NetPDelay::dump(ostream&o, unsigned ind) const
{
if (expr_) {
o << setw(ind) << "" << "#" << *expr_;
} else {
o << setw(ind) << "" << "#" << delay_;
}
if (statement_) {
o << endl;
statement_->dump(o, ind+2);
} else {
o << " /* noop */;" << endl;
}
}
void NetRelease::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "release " << lval_->name() << "; "
<< "/* " << get_line() << " */" << endl;
}
void NetRepeat::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "repeat (" << *expr_ << ")" << endl;
statement_->dump(o, ind+2);
}
void NetScope::dump(ostream&o) const
{
o << name();
switch (type_) {
case BEGIN_END:
o << " sequential block";
break;
case FORK_JOIN:
o << " parallel block";
break;
case FUNC:
o << " function";
break;
case MODULE:
o << " module <" << (module_name_? module_name_ : "") << ">";
break;
case TASK:
o << " task";
break;
}
o << endl;
o << " timescale = 10e" << time_unit() << " / 10e"
<< time_precision() << endl;
/* Dump the parameters for this scope. */
{
map<string,NetExpr*>::const_iterator pp;
for (pp = parameters_.begin()
; pp != parameters_.end() ; pp ++) {
o << " parameter " << (*pp).first << " = " <<
*(*pp).second << ";" << endl;
}
for (pp = localparams_.begin()
; pp != localparams_.end() ; pp ++) {
o << " localparam " << (*pp).first << " = " <<
*(*pp).second << ";" << endl;
}
}
/* Dump the saved defparam assignments here. */
{
map<hname_t,NetExpr*>::const_iterator pp;
for (pp = defparams.begin()
; pp != defparams.end() ; pp ++ ) {
o << " defparam " << (*pp).first << " = " <<
*(*pp).second << ";" << endl;
}
}
/* Dump the events in this scope. */
for (NetEvent*cur = events_ ; cur ; cur = cur->snext_) {
o << " event " << cur->name() << "; nprobe="
<< cur->nprobe() << " // " << cur->get_line() << endl;
}
// Dump the signals,
if (signals_) {
NetNet*cur = signals_->sig_next_;
do {
cur->dump_net(o, 4);
cur = cur->sig_next_;
} while (cur != signals_->sig_next_);
}
// Dump the memories,
if (memories_) {
NetMemory*cur = memories_->snext_;
do {
cur->dump(o, 4);
cur = cur->snext_;
} while (cur != memories_->snext_);
}
switch (type_) {
case FUNC:
func_def()->dump(o, 4);
break;
case TASK:
task_def()->dump(o, 4);
break;
}
/* Dump any sub-scopes. */
for (NetScope*cur = sub_ ; cur ; cur = cur->sib_)
cur->dump(o);
}
void NetSTask::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << name_;
if (parms_.count() > 0) {
o << "(";
if (parms_[0])
parms_[0]->dump(o);
for (unsigned idx = 1 ; idx < parms_.count() ; idx += 1) {
o << ", ";
if (parms_[idx])
parms_[idx]->dump(o);
}
o << ")";
}
o << ";" << endl;
}
void NetUTask::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << task_->name() << ";" << endl;
}
void NetWhile::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "while (" << *cond_ << ")" << endl;
proc_->dump(o, ind+3);
}
/* Dump a statement type that someone didn't write a dump for. */
void NetProc::dump(ostream&o, unsigned ind) const
{
o << setw(ind) << "" << "// " << typeid(*this).name() << endl;
}
/* Dump an expression that noone wrote a dump method for. */
void NetExpr::dump(ostream&o) const
{
o << "(?" << typeid(*this).name() << "?)";
}
void NetEBinary::dump(ostream&o) const
{
o << "(";
left_->dump(o);
o << ")";
switch (op_) {
default:
o << op_;
break;
case 'a':
o << "&&";
break;
case 'E':
o << "===";
break;
case 'e':
o << "==";
break;
case 'G':
o << ">=";
break;
case 'l':
o << "<<";
break;
case 'L':
o << "<=";
break;
case 'n':
o << "!=";
break;
case 'N':
o << "!==";
break;
case 'o':
o << "||";
break;
case 'O':
o << "~|";
break;
case 'r':
o << ">>";
break;
case 'X':
o << "~^";
break;
}
o << "(";
right_->dump(o);
o << ")";
}
void NetEConcat::dump(ostream&o) const
{
if (repeat_)
o << *repeat_;
if (parms_[0])
o << "{" << *parms_[0];
else
o << "{";
for (unsigned idx = 1 ; idx < parms_.count() ; idx += 1) {
if (parms_[idx])
o << ", " << *parms_[idx];
else
o << ", ";
}
o << "}";
}
void NetEConst::dump(ostream&o) const
{
if (value_.is_string())
o << "\"" << value_.as_string() << "\"";
else
o << value_;
}
void NetEScope::dump(ostream&o) const
{
o << "<scope=" << scope_->name() << ">";
}
void NetESFunc::dump(ostream&o) const
{
o << name_ << "(";
if (nparms() > 0)
o << *parm(0);
for (unsigned idx = 1 ; idx < nparms() ; idx += 1)
o << ", " << *parm(idx);
o << ")";
}
void NetESignal::dump(ostream&o) const
{
if (has_sign())
o << "+";
o << name() << "[" << msi_<<":"<<lsi_ << "]";
}
void NetEBitSel::dump(ostream&o) const
{
sig_->dump(o);
o << "[";
idx_->dump(o);
o << "]";
}
void NetEMemory::dump(ostream&o) const
{
o << mem_->name() << "[";
if (idx_) idx_->dump(o);
o << "]";
}
void NetEParam::dump(ostream&o) const
{
o << "<" << scope_->name() << "." << name_ << ">";
}
void NetETernary::dump(ostream&o) const
{
o << "(" << *cond_ << ") ? (" << *true_val_ << ") : (" <<
*false_val_ << ")";
}
void NetEUFunc::dump(ostream&o) const
{
o << name() << "(";
if (parms_.count() > 0) {
parms_[0]->dump(o);
for (unsigned idx = 1 ; idx < parms_.count() ; idx += 1) {
o << ", ";
parms_[idx]->dump(o);
}
}
o << ")";
}
void NetEUnary::dump(ostream&o) const
{
switch (op_) {
case 'N':
o << "~|";
break;
default:
o << op_;
break;
}
o << "(";
expr_->dump(o);
o << ")";
}
void Design::dump(ostream&o) const
{
o << "DESIGN TIME PRECISION: 10e" << get_precision() << endl;
o << "SCOPES:" << endl;
for (list<NetScope*>::const_iterator scope = root_scopes_.begin();
scope != root_scopes_.end(); scope++)
(*scope)->dump(o);
o << "ELABORATED NODES:" << endl;
// dump the nodes,
if (nodes_) {
NetNode*cur = nodes_->node_next_;
do {
cur->dump_node(o, 0);
cur = cur->node_next_;
} while (cur != nodes_->node_next_);
}
o << "ELABORATED PROCESSES:" << endl;
// Dump the processes.
for (const NetProcTop*idx = procs_ ; idx ; idx = idx->next_)
idx->dump(o, 0);
}
/*
* $Log: design_dump.cc,v $
* Revision 1.124 2002/05/26 01:39:02 steve
* Carry Verilog 2001 attributes with processes,
* all the way through to the ivl_target API.
*
* Divide signal reference counts between rval
* and lval references.
*
* Revision 1.123 2002/05/05 21:11:49 steve
* Put off evaluation of concatenation repeat expresions
* until after parameters are defined. This allows parms
* to be used in repeat expresions.
*
* Add the builtin $signed system function.