FASM 'ASSUME' Directive?

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Irwin

Joined: 25 Jan 2008
Posts: 1

Irwin 25 Jan 2008, 20:33

Hi!

Whilst using MASM32 in the past I would use an 'assume' directive to make the compiler aware to the fact that a register is pointing to a structure, so I could reference the structure like this:

Code:

mov    eax, dword ptr ds:[ebx+045h]
assume eax:POINT
mov    esi, dword ptr ds:[eax.x]

Now that I'm using FASM I can't find any such function, I've already looked through the documentation for such a directive/macro but I can't find any so I was wondering if there is any at all that I may have missed/overlooked.

Any help would be appreciated Smile

25 Jan 2008, 20:33

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 25 Jan 2008, 20:51

Use "include 'macro\masm.inc'"

And yes, it is not documented unfortunatelly, I think that http://flatassembler.net/docs.php?article=win32 should give some comments about it.

PS: Well, there is a reason for lack of documentation http://board.flatassembler.net/topic.php?p=37076#37076

25 Jan 2008, 20:51

dap

Joined: 01 Dec 2007
Posts: 61
Location: Belgium

dap 26 Jan 2008, 11:39

I've never used this feature with MASM but doesn't it look the same as VIRTUAL ?

26 Jan 2008, 11:39

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 26 Jan 2008, 11:58

you can get effect similar to "ASSUME" by using "virtual", but it's not the same.

26 Jan 2008, 11:58

MHajduk

Joined: 30 Mar 2006
Posts: 6115
Location: Poland

MHajduk 26 Jan 2008, 12:23

You can write

Code:

mov esi, dword [eax + POINT.x]

26 Jan 2008, 12:23

bitRAKE

Joined: 21 Jul 2003
Posts: 4072
Location: vpcmpistri

bitRAKE 26 Jan 2008, 21:53

Code:

Testing:
  virtual at edi
    .sym SYMBOL
  end virtual
  mov eax,[.sym.hash] ;=>mov eax,[edi+SYMBOL.hash]

...works well. As does:

Code:

Testing:
  label .sym DWORD at edx
  mov eax,[.sym]

...but does not easily extend to:

Code:

Testing:
  label .sym SYMBOL at edx
  mov eax,[.sym.hash]

...unless a macro is used to change label directive.
FASM only has type checking on CPU types as struc is just a macro really.

26 Jan 2008, 21:53

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