Hi John,
This is really great. I've been using an annotation for caller sensitive
methods for many year in IKVM as a performance enhancement and I can say that
my experiences with my simple mechanism are really great.
I've got a class ikvm.internal.CallerID that looks something like this:
public final class CallerID {
@Internal (IKVM specific annotation meaning that it is only public in the
module)
public native Call getCallerClass();
@Internal
public native ClassLoader getClassClassLoader();
@Internal
public static native getCallerID();
}
Any (trusted) method with an ikvm.internal.HasCallerID annotation can call the
CallerID.getCallerID() intrinsic and from there on the CallerID object gets
explicitly passed around to other methods when necessary. I modified
sun.reflect.MethodAccessor.invoke() to have an additional CallerID parameter
and MethodHandles.Lookup is also CallerID based.
JNI methods automatically act as if they have a HasCalleriD annotation and
store the caller on a stack inside the thread's JNIEnv.
(I'm not suggesting HotSpot uses the same design, that probably doesn't make
sense. Just that in the many years I've used this, I've found the explicit
caller sensitive annotation and explicitly passing around a cookie that
represents the caller to be an efficient and secure way to handle this.)
Regards,
Jeroen
> -----Original Message-----
> From: core-libs-dev-boun...@openjdk.java.net [mailto:core-libs-dev-
> boun...@openjdk.java.net] On Behalf Of mark.reinh...@oracle.com
> Sent: Friday, March 1, 2013 18:59
> To: john.r.r...@oracle.com
> Cc: core-libs-dev@openjdk.java.net
> Subject: JEP 176: Mechanical Checking of Caller-Sensitive Methods
>
> Posted: http://openjdk.java.net/jeps/176
>
> - Mark
