src/org/nutz/repo/org/objectweb/asm/Type.java
public static int getArgumentsAndReturnSizes(final String desc) {
        int n = 1;
        int c = 1;
        while (true) {
            char car = desc.charAt(c++);
            if (car == ')') {
                car = desc.charAt(c);
                return n << 2
                        | (car == 'V' ? 0 : (car == 'D' || car == 'J' ? 2 : 1));
            } else if (car == 'L') {
                while (desc.charAt(c++) != ';') {
                }
                n += 1;
            } else if (car == '[') {
                while ((car = desc.charAt(c)) == '[') {
                    ++c;
                }
                if (car == 'D' || car == 'J') {
                    n -= 1;
                }
            } else if (car == 'D' || car == 'J') {
                n += 2;
            } else {
                n += 1;
            }
        }
    }
public static int getArgumentsAndReturnSizes(final String desc) {
        int n = 1;
        int c = 1;
        while (true) {
            char car = desc.charAt(c++);
            if (car == ')') {
                car = desc.charAt(c);
                return n << 2
                        | (car == 'V' ? 0 : (car == 'D' || car == 'J' ? 2 : 1));
            } else if (car == 'L') {
                while (desc.charAt(c++) != ';') {
                }
                n += 1;
            } else if (car == '[') {
                while ((car = desc.charAt(c)) == '[') {
                    ++c;
                }
                if (car == 'D' || car == 'J') {
                    n -= 1;
                }
            } else if (car == 'D' || car == 'J') {
                n += 2;
            } else {
                n += 1;
            }
        }
    }
Computes the size of the arguments and of the return value of a method.

@param desc
the descriptor of a method.
@return the size of the arguments of the method (plus one for the
implicit this argument), argSize, and the size of its return
value, retSize, packed into a single int i =
<tt>(argSize &lt;&lt; 2) | retSize</tt> (argSize is therefore equal to
<tt>i &gt;&gt; 2</tt>, and retSize to <tt>i &amp; 0x03</tt>).