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Support evaluating + operator at compile time.

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steve
1999-10-10 23:29:37 +00:00
parent 564f972aef
commit 19b8615363
5 changed files with 244 additions and 34 deletions
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eval_tree.cc
+35 -7
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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: eval_tree.cc,v 1.4 1999/09/23 03:56:57 steve Exp $"
#ident "$Id: eval_tree.cc,v 1.5 1999/10/10 23:29:37 steve Exp $"
#endif
# include "netlist.h"
@@ -26,8 +26,8 @@ NetExpr* NetExpr::eval_tree()
{
return 0;
}
/*
/*
* Some of the derived classes can be evaluated by the compiler, this
* method provides the common aid of evaluating the parameter
* expressions.
@@ -46,8 +46,33 @@ void NetEBinary::eval_sub_tree_()
}
}
NetEConst* NetEBAdd::eval_tree()
{
eval_sub_tree_();
NetEConst*lc = dynamic_cast<NetEConst*>(left_);
if (lc == 0) return 0;
NetEConst*rc = dynamic_cast<NetEConst*>(right_);
if (rc == 0) return 0;
NetExpr* NetEBComp::eval_eqeq_()
verinum lval = lc->value();
verinum rval = rc->value();
verinum val;
switch (op_) {
case '+':
val = lval + rval;
break;
case '-':
val = lval - rval;
break;
default:
return 0;
}
return new NetEConst(val);
}
NetEConst* NetEBComp::eval_eqeq_()
{
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
@@ -70,7 +95,7 @@ NetExpr* NetEBComp::eval_eqeq_()
}
NetExpr* NetEBComp::eval_leeq_()
NetEConst* NetEBComp::eval_leeq_()
{
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
@@ -90,7 +115,7 @@ NetExpr* NetEBComp::eval_leeq_()
}
NetExpr* NetEBComp::eval_tree()
NetEConst* NetEBComp::eval_tree()
{
eval_sub_tree_();
@@ -106,7 +131,7 @@ NetExpr* NetEBComp::eval_tree()
}
}
NetExpr* NetEBLogic::eval_tree()
NetEConst* NetEBLogic::eval_tree()
{
eval_sub_tree_();
return 0;
@@ -116,7 +141,7 @@ NetExpr* NetEBLogic::eval_tree()
* Evaluate the shift operator if possible. For this to work, both
* operands must be constant.
*/
NetExpr* NetEBShift::eval_tree()
NetEConst* NetEBShift::eval_tree()
{
eval_sub_tree_();
NetEConst*re = dynamic_cast<NetEConst*>(right_);
@@ -236,6 +261,9 @@ NetExpr* NetEParam::eval_tree()
/*
* $Log: eval_tree.cc,v $
* Revision 1.5 1999/10/10 23:29:37 steve
* Support evaluating + operator at compile time.
*
* Revision 1.4 1999/09/23 03:56:57 steve
* Support shift operators.
*