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Re: What is FFI?

From: Helge Hess
Subject: Re: What is FFI?
Date: Mon, 22 Jan 2001 23:08:53 +0100


ffcall/libffi are libraries to assemble and disassemble C function call
environments at runtime. It does the same for C functions that
NSInvocation does for ObjC method invocations and indeed can be used as
a backend for NSInvocation, since ObjC methods are C functions after
All this is pretty complicated since call environments are radically
different between different architectures (different stack setups,
different register sets, different alignments, ...) which is why
NSInvocation's implementation quality often differs much between
different architectures.


Frederic wrote:
> Hi,
> I'm desperately trying to understand the role of FFI and ffcall.
> I have just installed ffcall-1.6a-1.i386.rpm downloaded from GNUstep
> website but it does not help.
> Can someone give me some clarification about that?

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