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ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 08 Mar 2010, 09:29

Why ??? I become crazy ! Sad

Code:

A)
---
symbol_ equ ab
match c, '"'#`symbol_#'"' { toto equ c }

DISPLAY toto : match c, toto { irps s, c \{ display \`s \} } 
RESULT : <"ab">

mov eax,toto  ;toto == 22626122h ;<---- it's correct ! (with debugger)

B)
---
symbol_ equ a*
match c, '"'#`symbol_#'"' { toto equ c }

DISPLAY toto : match c, toto { irps s, c \{ display \`s \} } 
RESULT : <"a*">

BUT,

mov eax,toto  ;toto == 000CE684h ;and not 222A6122h !?!?! <<---------- WHY ?

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I am not young enough to know everything (Oscar Wilde)-

08 Mar 2010, 09:29

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8268
Location: Kraków, Poland

Tomasz Grysztar 08 Mar 2010, 10:21

"ab" is a single token, "a*" are two separate tokens. The ` symbol works on a single token. Thus in first case you get '"'#'ab'#'"' => '"ab"', and in second case you get '"'#'a'*#'"' => '"a'*'"' (because # cannot concatenate name token with a quoted token), which is a multiplication of two quoted values.

Read more about tokenization here: http://flatassembler.net/docs.php?article=ufasm (in section "Tokenization of source and line makers").

08 Mar 2010, 10:21

ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 08 Mar 2010, 10:59

thank you for your reply. I begin to understand !

but,

why "ab" is a single token, and "a*" are two separate tokens ?
Why this difference of interpretation between <ab> and <a*> ?

_________________
I am not young enough to know everything (Oscar Wilde)-

08 Mar 2010, 10:59

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8268
Location: Kraków, Poland

Tomasz Grysztar 08 Mar 2010, 11:04

ouadji wrote:

why "ab" is a single token, and "a*" are two separate tokens ?
Why this difference of interpretation between <ab> and <a*> ?

Because fasm's syntax highlighter shows "*" in blue. Wink

"Jokes" aside, please read the section 1.2.1 of fasm's manual; second paragraph, to be precise.

08 Mar 2010, 11:04

ouadji

Joined: 24 Dec 2008
Posts: 1081
Location: Belgium

ouadji 08 Mar 2010, 11:23

Quote:

Because fasm's syntax highlighter shows "*" in blue.

ok, I read, I understood. thank you boss.

_________________
I am not young enough to know everything (Oscar Wilde)-

08 Mar 2010, 11:23

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