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/*
* Copyright (c) 2011 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 "expression.h"
# include "architec.h"
# include <ivl_assert.h>
bool Expression::evaluate(ScopeBase*, int64_t&) const
{
return false;
}
bool Expression::evaluate(Entity*, Architecture*arc, int64_t&val) const
{
return evaluate(arc, val);
}
bool ExpArithmetic::evaluate(ScopeBase*scope, int64_t&val) const
{
int64_t val1, val2;
bool rc;
rc = eval_operand1(scope, val1);
if (rc == false)
return false;
rc = eval_operand2(scope, val2);
if (rc == false)
return false;
switch (fun_) {
case PLUS:
val = val1 + val2;
break;
case MINUS:
val = val1 - val2;
break;
case MULT:
val = val1 * val2;
break;
case DIV:
if (val2 == 0)
return false;
val = val1 / val2;
break;
case MOD:
if (val2 == 0)
return false;
val = val1 % val2;
break;
case REM:
return false;
case POW:
return false;
case xCONCAT: // not possible
return false;
}
return true;
}
bool ExpAttribute::evaluate(ScopeBase*, int64_t&val) const
{
/* Special Case: The length attribute can be calculated all
the down to a literal integer at compile time, and all it
needs is the type of the base expression. (The base
expression doesn't even need to be evaluated.) */
if (name_ == "length") {
const VType*base_type = base_->peek_type();
//if (base_type == 0)
// base_type = base_->probe_type(ent,arc);
ivl_assert(*this, base_type);
const VTypeArray*arr = dynamic_cast<const VTypeArray*>(base_type);
if (arr == 0) {
cerr << get_fileline() << ": error: "
<< "Cannot apply the 'length attribute to non-array objects"
<< endl;
return false;
}
int64_t size = 1;
for (size_t idx = 0 ; idx < arr->dimensions() ; idx += 1) {
const VTypeArray::range_t&dim = arr->dimension(idx);
ivl_assert(*this, ! dim.is_box());
size *= 1 + labs(dim.msb() - dim.lsb());
}
val = size;
return true;
}
return false;
}
bool ExpAttribute::evaluate(Entity*, Architecture*arc, int64_t&val) const
{
return evaluate(arc, val);
}
/*
* I don't yet know how to evaluate concatenations. It is not likely
* to come up anyhow.
*/
bool ExpConcat::evaluate(ScopeBase*scope, int64_t&val) const
{
return false;
}
bool ExpName::evaluate(ScopeBase*scope, int64_t&val) const
{
const VType*type;
Expression*exp;
if (prefix_.get()) {
cerr << get_fileline() << ": sorry: I don't know how to evaluate ExpName prefix parts." << endl;
return false;
}
bool rc = scope->find_constant(name_, type, exp);
if (rc == false)
return false;
return exp->evaluate(scope, val);
}
bool ExpName::evaluate(Entity*ent, Architecture*arc, int64_t&val) const
{
if (prefix_.get()) {
cerr << get_fileline() << ": sorry: I don't know how to evaluate ExpName prefix parts." << endl;
return false;
}
const InterfacePort*gen = ent->find_generic(name_);
if (gen) {
cerr << get_fileline() << ": sorry: I don't necessarily handle generic overrides." << endl;
// Evaluate the default expression and use that.
if (gen->expr)
return gen->expr->evaluate(ent, arc, val);
}
return evaluate(arc, val);
}
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