How to use @ReservedStackAccess?

[Nicolai Parlog]

 Hi!

I've been experimenting with @ReservedStackAccess but couldn't get it
to work. Any help would be highly appreciated.

## SETUP

I'm artificially creating a stack overflow by recursing indefinitely.
I then want to benefit from @ReservedStackAccess by executing some
code outside of an exception handler.

Here's my code:

	public static void main(String[] args) {
		try {
			recurseThenGreet();
		} catch (StackOverflowError err) {
			// to not have the console spammed with output
			System.out.println("Error");
		}
	}

	@ReservedStackAccess
	private static void recurseThenGreet() {
		recurse();
		System.out.println("Hi!");
	}

	private static void recurse() {
		recurse();
	}

I'm using build 9-ea+141-jigsaw-nightly-h5650-20161026. I compile with

	--add-exports java.base/jdk.internal.vm.annotation=ALL-UNNAMED

to make the annotation available and launch with

	-XX:-RestrictReservedStack

to activate the reserved stack for user land code.

## OBSERVED

This is the output I get:

Java HotSpot(TM) 64-Bit Server VM warning: Potentially dangerous stack
overflow in ReservedStackAccess annotated method
org.codefx.demo.java9.internal.stack.ReservingStackFrames_Simple.recurseThenGreet()V[1]
Error

## EXPECTED

I expected "Hi!" to show up somewhere there.

My best guess is that I put the annotation in the wrong place but
experimenting didn't help. Any help would be greatly appreciated!

 Thanks!
 Nicolai



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