virtual at reg & push?

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wht36

Joined: 18 Sep 2005
Posts: 106

wht36 21 May 2011, 13:36

Hi, the code below gives "error: invalid value." rather than assembling pushd ebp (although pushd [var1] is correctly assembled into pushd [ebp]). Why is this so?

Code:

pushd var1

virtual at ebp
var1 dd ?
var2 dd ?
var3 dd ?
end virtual

As an aside, "pushd ebp+3" actually assembles without error. I thought I discovered a new use of push until I realise it is actually assembled into "pushd ebp, pushd 3"...

21 May 2011, 13:36

l_inc

Joined: 23 Oct 2009
Posts: 881

l_inc 21 May 2011, 14:41

Code:

virtual at ebp
var1 dd ?
var2 dd ? 
var3 dd ?
end virtual

is equivalent to

Code:

label var1 dword at ebp
label var2 dword at ebp+4
label var3 dword at ebp+8

So I assume, because register-based labels are the special case. I find such behaviour reasonable, because even if pushd var1 was allowed, then pushd var2 would not work anyway. This seems to be not so consistent as the current behaviour.

21 May 2011, 14:41

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