From: "Jeffrey R. Carter" <spam.not.jrcarter@acm.not.spam.org>
Subject: Re: Java wrappers around Ada?
Date: Sat, 25 Mar 2006 00:37:18 GMT
Date: 2006-03-25T00:37:18+00:00 [thread overview]
Message-ID: <2h0Vf.47877$oL.14733@attbi_s71> (raw)
In-Reply-To: <442466a1_1@newsfeed.slurp.net>
James Alan Farrell wrote:
> On the C side things are a bit messy. Out and in/out parameters become
> pointers. This works rather better than I would've thought (probably
> the pragma forces such parameters to be pointers where they would not
> always be otherwise). But even so, we have a lot of C functions with
> void * parameters instead of typed pointers and ints instead of Boolean,
> etc.
ARM B.3 defines how parameters should be passed to a convention-C subprogram.
> One interesting problem we had was converting Ada access types to C
> pointers. An Ada access type is a higher level construct than a C
> pointer, which means it may or might not actually "point" to the desired
> location in memory. What we found in practice is that arrays that are
> sized dynamically have a 64 bit entity in which the first 32 bits do
> point to the object of interest.
You can apply pragma Convention (C, ...); to an Ada access type to ensure that
it is C compatible.
--
Jeff Carter
"Ditto, you provincial putz?"
Blazing Saddles
86
prev parent reply other threads:[~2006-03-25 0:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-22 13:01 Java wrappers around Ada? kk_oop
2006-03-22 13:33 ` Larry Kilgallen
2006-03-23 6:57 ` Anders Wirzenius
2006-03-23 13:10 ` Larry Kilgallen
2006-03-22 13:33 ` Georg Bauhaus
2006-03-22 23:25 ` Jeffrey R. Carter
2006-03-23 22:24 ` James Alan Farrell
2006-03-23 22:59 ` kk_oop
2006-03-24 21:40 ` James Alan Farrell
2006-03-25 0:37 ` Jeffrey R. Carter [this message]
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