[844] in java-interest
jsp versus invokevirtual
daemon@ATHENA.MIT.EDU (th.indy.net@indy.net)
Mon Jul 24 03:50:10 1995
Date: Mon, 24 Jul 1995 00:59:56 -0500
From: th.indy.net@indy.net
To: java-interest@java.sun.com
I'm sorry if this is to the wrong group, but I am not really
interested in actually porting Java, so I never signed up for that list.
Anyway, I was looking over the Virtual Machine spec, and was
wondering if someone could answer this question: Since all references are
symbolic until run-time, the invokevirtual command is the way to get at a
certain method. This command has several safeguards for protecting against
getting into errant memory. However, the jsp (jump) statement still exists.
Obviously I can't use it for jumping to a method, but couldn't I get
dangerous with it just the same?
I guess I am confused over whether the method call lookups are just
added protection for solving the fragile superclass problem, and they just
happen to also be a security feature, or whether it is a security feature
in and of itself.
thanks,
tim
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