From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <java-return-27264-listarch-java=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 23926 invoked by alias); 12 Apr 2013 09:21:30 -0000
Mailing-List: contact java-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <java.gcc.gnu.org>
List-Id: <java.gcc.gnu.org>
List-Subscribe: <mailto:java-subscribe@gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/java/>
List-Post: <mailto:java@gcc.gnu.org>
List-Help: <mailto:java-help@gcc.gnu.org>, <http://gcc.gnu.org/ml/#faqs>
Sender: java-owner@gcc.gnu.org
Received: (qmail 23916 invoked by uid 89); 12 Apr 2013 09:21:30 -0000
X-Spam-SWARE-Status: No, score=-8.5 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,KHOP_THREADED,RCVD_IN_DNSWL_HI,RCVD_IN_HOSTKARMA_W,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.1
Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28)    by sourceware.org (qpsmtpd/0.84/v0.84-167-ge50287c) with ESMTP; Fri, 12 Apr 2013 09:21:29 +0000
Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23])	by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r3C9LRI5010117	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK);	Fri, 12 Apr 2013 05:21:28 -0400
Received: from zebedee.pink (ovpn-113-41.phx2.redhat.com [10.3.113.41])	by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r3C9LPIE009001;	Fri, 12 Apr 2013 05:21:25 -0400
Message-ID: <5167D214.8030606@redhat.com>
Date: Fri, 12 Apr 2013 09:21:00 -0000
From: Andrew Haley <aph@redhat.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130311 Thunderbird/17.0.4
MIME-Version: 1.0
To: Bryce McKinlay <bmckinlay@gmail.com>
CC: Bucher Fabio <fabio.bucher@ntb.ch>, "java@gcc.gnu.org" <java@gcc.gnu.org>
Subject: Re: ABI
References: <17B34E365AFABC468216733E4B4CC754615925DC@mail-server.ntb.ch> <CALUNu-p64Fj9+BV1GGJbvAV7CRZR4GRFBO8VYMF03bqwd6ZqDw@mail.gmail.com>
In-Reply-To: <CALUNu-p64Fj9+BV1GGJbvAV7CRZR4GRFBO8VYMF03bqwd6ZqDw@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-SW-Source: 2013-04/txt/msg00008.txt.bz2

On 04/11/2013 10:42 PM, Bryce McKinlay wrote:
> On Thu, Apr 11, 2013 at 12:56 PM, Bucher Fabio <fabio.bucher@ntb.ch> wrote:
> 
>> I am looking for the ABI the GCJ uses. Wich file contains the information a= =3D bout it?
>>
>> Is it in the sourcecode or exist a pdf-documantation?
> 
> GCJ actually has two ABIs. The first, "old ABI" mimics the C++ ABI in
> most respects: C++ code can call Java classes as if they were C++,
> more-or-less. This results in a "brittle" ABI: any non-trivial change
> to an underlying library requires re-compilation of binaries built
> against it.
> 
> The second, "BC ABI" (enabled with --indirect-dispatch) changes the
> way things like method calls, field accesses, and class loading work
> so that compiled code more closely adheres to the binary compatibility
> rules of Java bytecode.

Ah, good point.  I presumed that the question was about the C++ ABI,
since that's the only thing that's really externally visible.

Andrew.