Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uunet!proto!joe
From: joe@proto.COM (Joe Huffman)
Newsgroups: comp.lang.c++
Subject: Re: calling Zortech C++ methods from assembly
Summary: I don't think you want to do this...
Message-ID: <1394@proto.COM>
Date: 18 Aug 90 04:57:46 GMT
References: <1990Aug17.142520.5402@aucs.uucp>
Organization: Prototronics; Sandpoint, Idaho
Lines: 28

In article <1990Aug17.142520.5402@aucs.uucp>, 880716a@aucs.uucp 
(Dave Astels) writes:
> 
> I looked through the assembly sections of the compiler manual (2.06)
> but couldn't find the required info.  It only discussed calling assembly
> from C++ (with C linkage).  What I need is the information required to
> invoke C++ methods from assembly.

The reason it isn't documented is because it can be a real nightmare.  The
names are mangled for type safe linking, there are hidden parameters 
('this') and virtual functions are really function pointers (that may change 
their location between compiler versions).

Basically, don't do it.  If you REALLY want to do it, call the function
from a C++ function, compile with -gl (line numbers turned on), then 
run OBJTOASM on the resultant .OBJ file.  This will generate the assembly
code from the object code the compiler generated.  This will show you
the mangled function name, how it's done with the current version of the 
compiler and with that particular function.   

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