Print Page - Masm bug? Macro not working when called as first instruction after Start:

Title: Masm bug? Macro not working when called as first instruction after Start:
Post by: jj2007 on June 17, 2008, 01:24:09 PM

Just made a strange discovery. The code below works perfectly. However, try...

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start: .if EXIST(addr FindMe)

... instead of ...

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start:
	.if EXIST(addr FindMe)

Is this a known bug?

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.nolist
include \masm32\include\masm32rt.inc

EXIST MACRO fname:REQ, DiscardHandle:=<1>
 invoke FindFirstFile, reparg(<fname>), addr wfd
 .if eax==INVALID_HANDLE_VALUE
	xor eax, eax
 .elseif DiscardHandle
	invoke FindClose, eax
 .endif
 EXITM <eax>
ENDM

.data?
wfd	WIN32_FIND_DATA <?>

.data
FindMe	db "\masm32\OllyDbg\OLLYDBG.EXE", 0
FileEx	db "The file exists:", 0
NoFile	db "The file does NOT exist:", 0

.code
start:
	.if EXIST(addr FindMe)
		invoke MessageBox, 0, addr FindMe, addr FileEx, MB_OK
	.else
		invoke MessageBox, 0, addr FindMe, addr NoFile, MB_OK
	.endif
	invoke ExitProcess, 0
end start

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Title: Re: Masm bug? Macro not working when called as first instruction after Start:
Post by: qWord on June 17, 2008, 02:38:29 PM

hi,

i don't think this is a bug. The code in EXIST()-macro will be created before the entrypoint. The reason for this is that masm expand macros before the current line.

regards qword

Title: Re: Masm bug? Macro not working when called as first instruction after Start:
Post by: jj2007 on June 17, 2008, 02:50:04 PM

Good to know, thanks a lot!

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