A memory data size checking

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Moveton

Joined: 24 Feb 2008
Posts: 2

Moveton 24 Feb 2008, 22:51

[quote=fasm roots]However in flat assembler every label, though being just address at the first sight, still keeps the information about what type of variable is defined behind it - and provides the size checking just like I had it with TASM[/quote]
So I've written the followng:

Code:

format COFF

public _app1Entry

        use32
section "XDATA" data
d1:
        dw ?

section "XCODE" code
_app1Entry:
        mov [d1], ebx
        ret

assuming to got an error but last fasm takes it without questions and even warnings. Should I activate the size checking by some special way?

24 Feb 2008, 22:51

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20416
Location: In your JS exploiting you and your system

revolution 24 Feb 2008, 22:59

You can't use the colon (:) if you want size checking:

Code:

section "XDATA" data
d1        dw ? 
...

24 Feb 2008, 22:59

Moveton

Joined: 24 Feb 2008
Posts: 2

Moveton 24 Feb 2008, 23:59

So with colon this will be not data label. Understand but seems as not intuitive. It will be fine to be documented somewhere.

24 Feb 2008, 23:59

edfed

Joined: 20 Feb 2006
Posts: 4352
Location: Now

edfed 25 Feb 2008, 00:28

it is documented
but it's to the reader to understand the text.

http://flatassembler.net/docs.php?article=manual#1.2.3

Quote:

There are different ways to define labels. The simplest is to follow the name of label by the colon, this directive can even be followed by the other instruction in the same line. It defines the label whose value is equal to offset of the point where it's defined. This method is usually used to label the places in code. The other way is to follow the name of label (without a colon) by some data directive. It defines the label with value equal to offset of the beginning of defined data, and remembered as a label for data with cell size as specified for that data directive in table 1.3.

25 Feb 2008, 00:28

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