push eax+5

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Mr_Silent

Joined: 25 Apr 2006
Posts: 30

Mr_Silent 04 Feb 2007, 14:12

...compiles into

Code:

push eax
push 5

Is this normal? (I couldn't find this behavour in manual)

04 Feb 2007, 14:12

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 04 Feb 2007, 15:18

The "+" here is working as word separator and sign specifier at the same time, the same happens with "-".

This also happens when you declare a macro like this way

Code:

macro aMacro[args] ; No space between "aMacro" and "["
{}

04 Feb 2007, 15:18

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 04 Feb 2007, 16:51

Mr_Silent: this is because of "hack" to syntax, to allow commands like this:

Code:

push eax ebx ecx

.

Drawback is that "push eax+5" is then same as "push eax +5", and "+" is both unary and binary operator.

04 Feb 2007, 16:51

IceStudent

Joined: 19 Dec 2003
Posts: 60
Location: Ukraine

IceStudent 17 Feb 2007, 09:43

Dangerous feature..

Code:

push edx+5  ; push edx, push 5
push dword[edx+5]  ; push [edx+5]
push buf+5  ; push buf+5

1st push - an exception from the common syntax and we must remember it (hello, C language). But in the macro it can be hidden from eyes and became a potentially error.

17 Feb 2007, 09:43

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