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t-dll-expr.cc
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t-dll-expr.cc
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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: t-dll-expr.cc,v 1.7 2000/10/28 22:32:34 steve Exp $"
#endif
# include "t-dll.h"
# include "netlist.h"
# include <assert.h>
# include <malloc.h>
/*
* These methods implement the expression scan that generates the
* ivl_expr_t representing the expression. Each method leaves the
* expr_ member filled with the ivl_expr_t that represents it. Each
* method expects that the expr_ member empty (0) when it starts.
*/
void dll_target::expr_binary(const NetEBinary*net)
{
assert(expr_ == 0);
net->left()->expr_scan(this);
ivl_expr_t left = expr_;
expr_ = 0;
net->right()->expr_scan(this);
ivl_expr_t rght = expr_;
expr_ = (ivl_expr_t)calloc(1, sizeof(struct ivl_expr_s));
assert(expr_);
expr_->type_ = IVL_EX_BINARY;
expr_->width_= net->expr_width();
expr_->u_.binary_.op_ = net->op();
expr_->u_.binary_.lef_ = left;
expr_->u_.binary_.rig_ = rght;
}
void dll_target::expr_concat(const NetEConcat*net)
{
assert(expr_ == 0);
ivl_expr_t cur = new struct ivl_expr_s;
assert(cur);
cur->type_ = IVL_EX_CONCAT;
cur->width_= net->expr_width();
cur->u_.concat_.rept = net->repeat();
cur->u_.concat_.parms = net->nparms();
cur->u_.concat_.parm = new ivl_expr_t [net->nparms()];
for (unsigned idx = 0 ; idx < net->nparms() ; idx += 1) {
expr_ = 0;
net->parm(idx)->expr_scan(this);
assert(expr_);
cur->u_.concat_.parm[idx] = expr_;
}
expr_ = cur;
}
void dll_target::expr_const(const NetEConst*net)
{
assert(expr_ == 0);
expr_ = (ivl_expr_t)calloc(1, sizeof(struct ivl_expr_s));
assert(expr_);
if (net->value().is_string()) {
expr_->type_ = IVL_EX_STRING;
expr_->width_= net->expr_width();
expr_->u_.string_.value_ =strdup(net->value().as_string().c_str());
} else {
verinum val = net->value();
unsigned idx;
char*bits;
expr_->type_ = IVL_EX_NUMBER;
expr_->width_= net->expr_width();
expr_->signed_ = val.has_sign()? 1 : 0;
expr_->u_.number_.bits_ = bits = (char*)malloc(expr_->width_);
for (idx = 0 ; idx < expr_->width_ ; idx += 1)
switch (val.get(idx)) {
case verinum::V0:
bits[idx] = '0';
break;
case verinum::V1:
bits[idx] = '1';
break;
case verinum::Vx:
bits[idx] = 'x';
break;
case verinum::Vz:
bits[idx] = 'z';
break;
default:
assert(0);
}
}
}
void dll_target::expr_sfunc(const NetESFunc*net)
{
assert(expr_ == 0);
expr_ = (ivl_expr_t)calloc(1, sizeof(struct ivl_expr_s));
assert(expr_);
expr_->type_ = IVL_EX_SFUNC;
expr_->width_= net->expr_width();
expr_->u_.sfunc_.name_ = strdup(net->name());
}
void dll_target::expr_signal(const NetESignal*net)
{
assert(expr_ == 0);
expr_ = (ivl_expr_t)calloc(1, sizeof(struct ivl_expr_s));
assert(expr_);
expr_->type_ = IVL_EX_SIGNAL;
expr_->width_= net->expr_width();
expr_->u_.subsig_.name_ = strdup(net->name().c_str());
}
/*
* $Log: t-dll-expr.cc,v $
* Revision 1.7 2000/10/28 22:32:34 steve
* API for concatenation expressions.
*
* Revision 1.6 2000/10/28 17:55:03 steve
* stub for the concat operator.
*
* Revision 1.5 2000/10/05 05:03:01 steve
* xor and constant devices.
*
* Revision 1.4 2000/09/30 02:18:15 steve
* ivl_expr_t support for binary operators,
* Create a proper ivl_scope_t object.
*
* Revision 1.3 2000/09/26 00:30:07 steve
* Add EX_NUMBER and ST_TRIGGER to dll-api.
*
* Revision 1.2 2000/09/24 02:21:53 steve
* Add support for signal expressions.
*
* Revision 1.1 2000/09/23 05:15:07 steve
* Add enough tgt-verilog code to support hello world.
*
*/