[Nasm-users] Preventing macro name expansion

[Ermin R. A. <e.a...@st...>]

Is there a way to stop a (single line) macro name from being expanded? I'm writing macros which create other macros, whose names are built up using the %+ operator, and I want to be able to test if a macro with the same name exists or possibly redefine it.

I've tried something similar to the following, but it's not working (a bunch of errors saying %xdefine and %ifdef expect identifiers, so I assume that means that it expanded the name passed to it before testing):

%macro DefMac 2.nolist
	%xdefine %1 %2
%endmacro

%define LastNum 1
%macro FlagEnum 1.nolist
	%warning Defining FlagVal. %+ %1
	%ifdef FlagVal. %+ %1
		%warning FlagVal. %+ %1 Redefined
	%endif
	DefMac FlagVal. %+ %1, LastNum
	%assign LastNum LastNum << 1
%endmacro

FlagEnum A
FlagEnum B
FlagEnum C
; ...
FlagEnum A

; ... there a way to stop a (single line) macro name from being expanded? I'm writing macros which create other macros, whose names are built up using the %+ operator, and I want to be able to test if a macro with the same name exists or possibly redefine it.

I've tried something similar to the following, but it's not working (a bunch of errors saying %xdefine and %ifdef expect identifiers, so I assume that means that it expanded the name passed to it before testing):

%macro DefMac 2.nolist
	%xdefine %1 %2
%endmacro

%define LastNum 1
%macro FlagEnum 1.nolist
	%warning Defining FlagVal. %+ %1
	%ifdef FlagVal. %+ %1
		%warning FlagVal. %+ %1 Redefined
	%endif
	DefMac FlagVal. %+ %1, LastNum
	%assign LastNum LastNum << 1
%endmacro

FlagEnum A
FlagEnum B
FlagEnum C
; ...
FlagEnum A

; .
--------------------------------------------
Robert Alegrid
#3164658
BP 079 Physics