On Nov 9, 2010, at 4:25 PM, Rémi Forax wrote:
> Here is an example.
> If indy has no parameter, it tests void -> indy return type
> If indy has one parameter, it test parameter type -> return type
> If indy name is "spread", a spread/collect is done.
>
> Rémi
>
> PS: With the new API, all identity methods but the one that take no
> parameter
> can be removed and replace by Methodhandles.identity() in the BSM.
I just got back to this bug and now that InvokeDynamic is gone how can I
rewrite that code to work again (without John's Indify magic)?
-- Christian
>
> ---------------------------------------------------------------------------------------------------
> public class ConvertTest {
> private static boolean identity(boolean v) {
> return v;
> }
> private static byte identity(byte v) {
> return v;
> }
> private static char identity(char v) {
> return v;
> }
> private static short identity(short v) {
> return v;
> }
> private static int identity(int v) {
> return v;
> }
> private static long identity(long v) {
> return v;
> }
> private static float identity(float v) {
> return v;
> }
> private static double identity(double v) {
> return v;
> }
>
> private static void identity() { }
>
> private static void assertEquals(Object o, Object o2) {
> if (!o.equals(o2))
> throw new AssertionError("expected "+ o +" found "+o2);
> }
>
> public static void main(String[] args) throws Throwable {
> for(int i=0; i< 1000000; i++) {
> boolean dummyZ; byte dummyB; short dummyS; char dummyC; int
> dummyI; long dummyL; float dummyF; double dummyD;
>
>
> //dummyZ = (boolean)InvokeDynamic.foo(); // void -> boolean
> //dummyI = (int)InvokeDynamic.foo(); // void -> int
>
> //InvokeDynamic.foo(4); // int -> void
> InvokeDynamic.spread(4); // spread: int -> void
>
> //dummyF = (float)InvokeDynamic.foo(4); // int -> float
> //dummyD = (double)InvokeDynamic.foo(4); // int -> double
>
> //assertEquals(4.0f, (float)InvokeDynamic.foo(4)); // int -> float
> }
> }
>
> static {
> Linkage.registerBootstrapMethod("bootstrap");
> }
>
> private static CallSite bootstrap(Class<?> declaring, String name,
> MethodType methodType) throws Throwable {
> Lookup lookup = MethodHandles.lookup();
>
> MethodHandle mh;
> if (methodType.parameterCount() == 0) {
> mh = lookup.findStatic(ConvertTest.class, "identity",
> MethodType.methodType(void.class));
> } else {
> Class<?> type = methodType.parameterType(0);
> mh = lookup.findStatic(ConvertTest.class, "identity",
> MethodType.methodType(type, type));
>
> if ("spread".equals(name)) {
> mh = MethodHandles.spreadArguments(mh,
> methodType.changeParameterType(0, Object[].class));
> mh = MethodHandles.collectArguments(mh, methodType);
> }
> }
>
> mh = mh.asType(methodType);
>
> CallSite cs = new CallSite();
> cs.setTarget(mh);
> return cs;
> }
> }
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