import java.util.*;
public class VarExpr extends Expr {
- static boolean DOMEMCHECKS=true;
+ static boolean DOMEMCHECKS=false;
static boolean DOTYPECHECKS=false;
static boolean DONULL=false;
return hs;
}
+ public Expr getLower() {
+ return vd.getLower();
+ }
+
+ public Expr getUpper() {
+ return vd.getUpper();
+ }
+
public SetDescriptor getSet() {
+ if (vd==null)
+ return null;
return vd.getSet();
}
return false;
}
+ public Set useDescriptor(Descriptor d) {
+ HashSet newset=new HashSet();
+ if (d==vd)
+ newset.add(this);
+ return newset;
+ }
+
public boolean isNonNull() {
return true;
}
return vd.isGlobal();
}
- public void generate(CodeWriter writer, VarDescriptor dest) {
+ public boolean isInvariant(Set vars) {
+ return vd.isGlobal()||vars.contains(vd);
+ }
+
+ public Set findInvariants(Set vars) {
+ if (isInvariant(vars)) {
+ Set s=new HashSet();
+ s.add(this);
+ return s;
+ } else
+ return new HashSet();
+ }
+
+ public void generate(CodeWriter writer, VarDescriptor dest) {
// #TBD#: bit of a hack, really should have been type checked properly
assert vd != null;
assert vd.getType() != null;
this.td = vd.getType();
+ if (writer.getInvariantValue()!=null&&
+ writer.getInvariantValue().isInvariant(this)) {
+ writer.outputline("maybe="+writer.getInvariantValue().getMaybe(this).getSafeSymbol()+";");
+ writer.outputline(vd.getType().getGenerateType().getSafeSymbol()+
+ " "+dest.getSafeSymbol()+"="+writer.getInvariantValue().getValue(this).getSafeSymbol()+";");
+ return;
+ }
writer.outputline(vd.getType().getGenerateType().getSafeSymbol() + " " + dest.getSafeSymbol() +
" = (" + vd.getType().getGenerateType().getSafeSymbol() + ") " + vd.getSafeSymbol() + "; //varexpr");