/**
* Reports the number of JVM stack slots which carry all parameters including and after the given
* position, which must be in the range of 0 to {@code parameterCount} inclusive. Successive
* parameters are more shallowly stacked, and parameters are indexed in the bytecodes according to
* their trailing edge. Thus, to obtain the depth in the outgoing call stack of parameter {@code
* N}, obtain the {@code parameterSlotDepth} of its trailing edge at position {@code N+1}.
*
* <p>Parameters of type {@code long} and {@code double} occupy two stack slots (for historical
* reasons) and all others occupy one. Therefore, the number returned is the number of arguments
* <em>including</em> and <em>after</em> the given parameter, <em>plus</em> the number of long or
* double arguments at or after after the argument for the given parameter.
*
* <p>This method is included for the benfit of applications that must generate bytecodes that
* process method handles and invokedynamic.
*
* @param num an index (zero-based, inclusive) within the parameter types
* @return the index of the (shallowest) JVM stack slot transmitting the given parameter
* @throws IllegalArgumentException if {@code num} is negative or greater than {@code
* parameterCount()}
*/
/*non-public*/ int parameterSlotDepth(int num) {
if (num < 0 || num > ptypes.length) parameterType(num); // force a range check
return form.parameterToArgSlot(num - 1);
}
