/**
* Create a representation of a range from min to max.
*
* @param min is the lower bound
* @param max is the upper bound
*/
public static Bound create(Expression min, Expression max) {
if (max == null) {
if (min == null) return noBound;
max = LiteralMap.put(0x7ffffff, Machine.currentMachine.getIntegerCalcType());
}
if (bounds != null) {
int n = bounds.size();
for (int i = 0; i < n; i++) {
Bound ta = bounds.elementAt(i);
if (!min.equivalent(ta.min)) continue;
if (!max.equivalent(ta.max)) continue;
return ta;
}
}
Bound a = new Bound(min, max);
return a;
}
/**
* Return the integer value minimum value for the bound.
*
* @throws scale.common.InvalidException if the minimum value for the bound is not statically
* known
*/
public final long getConstMin() throws scale.common.InvalidException {
if ((flags & INTMIN) != 0) return minValue;
if ((flags & MINCALC) != 0)
throw new scale.common.InvalidException(
"The number of elements is not known at compile time.");
flags |= MINCALC;
minValue = scale.common.Lattice.convertToLongValue(min.getConstantValue());
flags |= INTMIN;
return minValue;
}
/** Return true if the types are equivalent. */
public boolean equivalent(Node tc) {
if (!(tc instanceof Bound)) return false;
Bound t2 = (Bound) tc;
if (this == t2) return true;
if ((min == t2.min) && (max == t2.max)) return true;
if ((min == null) || (t2.min == null) || (max == null) || (t2.max == null)) return false;
Literal b1 =
scale.common.Lattice.equal(
min.getCoreType(), min.getConstantValue(), t2.min.getConstantValue());
Literal b2 =
scale.common.Lattice.equal(
max.getCoreType(), max.getConstantValue(), t2.max.getConstantValue());
try {
if (!scale.common.Lattice.convertToBooleanValue(b1)) return false;
if (!scale.common.Lattice.convertToBooleanValue(b2)) return false;
} catch (scale.common.InvalidException e) {
return false;
}
return true;
}