import jdk.nashorn.internal.codegen.types.NumericType; //导入依赖的package包/类
/**
 * Pop a type from the existing stack, ensuring that it is numeric. Boolean type is popped as int type.
 *
 * @return the type
 */
private NumericType popNumeric() {
    final Type type = popType();
    if(type.isBoolean()) {
        // Booleans are treated as int for purposes of arithmetic operations
        return Type.INT;
    }
    assert type.isNumeric();
    return (NumericType)type;
}
 

import jdk.nashorn.internal.codegen.types.NumericType; //导入依赖的package包/类
/**
 * Helper function - expect two types that are numbers and equivalent
 *
 * @return common type
 */
private NumericType get2n() {
    final NumericType p0 = popNumeric();
    final NumericType p1 = popNumeric();
    assert p0.isEquivalentTo(p1) : "expecting equivalent types on stack but got " + p0 + " and " + p1;
    return p0;
}
 

import jdk.nashorn.internal.codegen.types.NumericType; //导入依赖的package包/类
/**
 * Pop a type from the existing stack, ensuring that it is numeric,
 * assert if not
 *
 * @return the type
 */
private NumericType popNumeric() {
    final Type type = stack.pop();
    assert type.isNumeric() : type + " is not numeric";
    return (NumericType)type;
}