public boolean isSafe() {
if (!left.isSafe())
return false;
+
FieldDescriptor tmpfd=fd;
- if (tmpfd instanceof ArrayDescriptor)
- return false; // Arrays could be out of bounds
+
if (tmpfd.getPtr()) // Pointers cound be invalid
return false;
- return true;
+
+ if (tmpfd instanceof ArrayDescriptor) {
+ Expr arrayindex=((ArrayDescriptor)tmpfd).getIndexBound();
+ if (index instanceof IntegerLiteralExpr&&arrayindex instanceof IntegerLiteralExpr) {
+ int indexvalue=((IntegerLiteralExpr)index).getValue();
+ int arrayindexvalue=((IntegerLiteralExpr)arrayindex).getValue();
+ if (indexvalue>=0&&indexvalue<arrayindexvalue)
+ return true;
+ }
+ return false; // Otherwise, arrays could be out of bounds
+ }
+ return true;
}
public Set freeVars() {
if (intindex != null) {
v.addAll(intindex.getRequiredDescriptors());
}
+ v.add(fd);
return v;
}