Re: Function's default values are corrupted (Nasty bug)
Re: Function's default values are corrupted (Nasty bug)
- Subject: Re: Function's default values are corrupted (Nasty bug)
- From: Dave Thorup <email@hidden>
- Date: Thu, 31 Mar 2005 17:20:34 -0500
On Mar 30, 2005, at 7:32 PM, daniel wrote:
Can you break at the call to the SetSize function and see if it looks
like the values are being setup correctly the compiler before calling
the function? That's what I'd look at. I'm not too familiar with C++
implementation but I assume it probably just translates:
SetSize(nWd, nHt, nExtra);
into
SetSize(nWd, nHt, nExtra, -1, -1, -1);
If you look at the disassembly and it doesn't seem to be what it's
doing, then I'd suspect some mismatch somewhere between part of your
code thinking it's C++ and part of it thinking it's just C.
If you can't create the problem with a simple test case, perhaps you
can pare down your sources to get a smaller test case and then post an
example.
Well, here's the appropriate disassembly:
0x001e3f68 <+5396> lwz r4,52(r2)
0x001e3f6c <+5400> lwz r5,56(r9)
0x001e3f70 <+5404> li r6,20
0x001e3f74 <+5408> li r7,0
0x001e3f78 <+5412> li r8,0
0x001e3f7c <+5416> li r9,0
0x001e3f80 <+5420> bl 0x512c58 <Lm2EE7SetSizeEmmssss>
Which corresponds to this:
SetSize( m_nWd, m_nHt, 20 );
So it does look like it's incorrectly setting 0 for each of the nEx2 -
4 parameters. Does anyone have any ideas why it would be doing this?
My attempts so far at creating a simple test case have failed. This is
very annoying.
_____________________________
Dave Thorup
Software Engineer
email@hidden
http://www.kuwan.net
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