private ConstantValue evaluateShiftExpr(
Expression lhs, Expression rhs, Type resultType, ShiftOperation operation) {
// Evaluate subexpressions
ConstantValue valueLhs = lhs.accept(this, null);
ConstantValue valueRhs = rhs.accept(this, null);
// Make integer promotions
final ConstantType leftPromotedType = typeFactory.newConstantType(resultType);
final ConstantType rightPromotedType =
typeFactory.newConstantType(rhs.getType().get().promote());
valueLhs = valueLhs.castTo(leftPromotedType);
valueRhs = valueRhs.castTo(rightPromotedType);
// Perform the operation
switch (operation) {
case LEFT_SHIFT:
return valueLhs.shiftLeft(valueRhs);
case RIGHT_SHIFT:
return valueLhs.shiftRight(valueRhs);
default:
throw new RuntimeException("unexpected shift operation kind '" + operation + "'");
}
}
