How to limit scope of a macro to the given procedure body.

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MHajduk

Joined: 30 Mar 2006
Posts: 6113
Location: Poland

MHajduk 10 Aug 2019, 17:20

I'd like to ask here the following (maybe lame) question:

how to limit scope of a macro (or a set of macros) to the interior of the particular procedure, i.e. applicability of the aforementioned macros is limited strictly to the part of the source contained within the procedure definition, outside those macros should be "invisible" for the fasm compiler. Note that I don't want to decorate the names of the macros with preceding dots, underscores and other characters like that (names of the macros will start with letters).

How can I do that?

10 Aug 2019, 17:20

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8466
Location: Kraków, Poland

Tomasz Grysztar 10 Aug 2019, 17:39

I assume this is about fasm 1, since fasmg has proper namespaces that work for macros, too.

You can make macros temporary by restoring them to their previous definition (or undefined state) with PURGE directive. To make this automatic, you can have some framework that would keep track of the macros that need to be PURGEd at the end of procedure. For example something like:

Code:

macro macroscope {
        define list@macroscope
}

macro .macro definition& {
        local buffer
        define buffer definition
        match name tail, buffer: \{
                match any, list@macroscope \\{ restore list@macroscope
                                               define list@macroscope any,name \\}
                match , list@macroscope \\{ restore list@macroscope
                                            define list@macroscope name \\}
        \}
        macro definition
}

macro endmacroscope {
        match list, list@macroscope \{
                irp name, list \\{
                        purge name
                \\}
        \}
        restore list@macroscope
}

Code:

macroscope

        .macro test {
                display 'macro in scope'
        }

        test

endmacroscope

        test    ax,bx           ; back to normal x86 instruction

10 Aug 2019, 17:39

MHajduk

Joined: 30 Mar 2006
Posts: 6113
Location: Poland

MHajduk 10 Aug 2019, 17:49

Tomasz Grysztar wrote:

I assume this is about fasm 1, since fasmg has proper namespaces that work for macros, too.

Yes, that's right, I was thinking about fasm 1.

Thanks for the reply, this is exactly a solution I wanted. Smile

10 Aug 2019, 17:49

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