jodd-proxetta/src/main/java/jodd/asm7/Frame.java
private void pop(final String descriptor) {
    char firstDescriptorChar = descriptor.charAt(0);
    if (firstDescriptorChar == '(') {
      pop((Type.getArgumentsAndReturnSizes(descriptor) >> 2) - 1);
    } else if (firstDescriptorChar == 'J' || firstDescriptorChar == 'D') {
      pop(2);
    } else {
      pop(1);
    }
  }
private void pop(final String descriptor) {
    char firstDescriptorChar = descriptor.charAt(0);
    if (firstDescriptorChar == '(') {
      pop((Type.getArgumentsAndReturnSizes(descriptor) >> 2) - 1);
    } else if (firstDescriptorChar == 'J' || firstDescriptorChar == 'D') {
      pop(2);
    } else {
      pop(1);
    }
  }
Pops as many abstract types from the output frame stack as described by the given descriptor.

@param descriptor a type or method descriptor (in which case its argument types are popped).