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Date: Thu, 03 Nov 2005 21:34:00 -0000
Message-Id: <200511032134.jA3LYDsT017248@elgar.sibelius.xs4all.nl>
From: Mark Kettenis <mark.kettenis@xs4all.nl>
To: woodzltc@cn.ibm.com
CC: drow@false.org, gdb@sources.redhat.com
In-reply-to: <Pine.LNX.4.63.0511031110100.7578@linux.site> (message from Wu
	Zhou on Thu, 3 Nov 2005 11:14:51 +0800 (CST))
Subject: Re: The root cause for SEGV in evaluating fortran function call,
 any solution or suggestion?
References: <Pine.LNX.4.63.0508221743470.10411@linux.site>
 <Pine.LNX.4.63.0511021033530.3549@linux.site> <20051102145258.GA28372@nevyn.them.org> <Pine.LNX.4.63.0511031110100.7578@linux.site>
X-SW-Source: 2005-11/txt/msg00080.txt.bz2

> Date: Thu, 3 Nov 2005 11:14:51 +0800 (CST)
> From: Wu Zhou <woodzltc@cn.ibm.com>
> 
> Maybe we can convert the argument to its pointer before we enter into
> call_function_by_hand (evaluate_subexp_standard: case OP_FUNCALL)?  
> Normally what function you will use to allocate memory on the stack?  I am 
> not very familar with that kind of code.  Thanks!

Allocating memory on the stack is actually quite eazy.  Just
substract/add the amount of space you need from/to the stack pointer,
and use the new/old stack pointer as the address for the memory.
Whether you should substract or add depends on whether the stack grows
downward or upward.  Use gdbarch_inner_than(gdbarch, 1, 2) to check.
There's quite a bit of code in infcall.c that uses this trick.

Mark