nasm/test/evalmacro.asm

%define tonum(=x) x

	dd tonum(1+3)
	dd tonum(5*7)

%define mixed(a,=b,c)	(a + b)
%define mixed2(a,=b,)	(a + b)
%define ALPHA (1 + 2)
%define BETA  (3 + 4)
%define GAMMA (5 + 6)

	dd mixed(ALPHA, BETA, GAMMA)
	dd mixed2(ALPHA, BETA, GAMMA)
preproc: add %i... variants, evaluated macro parameters, cleanups All directives which create single-line macros now have %i... variants to define case-insensitive versions. Case insensitive rather sucks, but at least this way it is consistent. Single-line macro parameters can now be evaluated as a number, as done by %assign. To do so, declare a parameter starting with =, for example: %define foo(x,=y) mov [x],macro_array_y ... would evaluate y as a number but leave x as a string. NOTE: it would arguably be better to have this as a per-instance basis, but it is easily handled by having a secondary macro called with the same argument twice. Finally, add a more consistent method for defining "magic" macros, which need to be evaluated at runtime. For now, it is only used by the special macros __FILE__, __LINE__, __BITS__, __PTR__, and __PASS__. __PTR__ is a new macro which evaluates to word, dword or qword matching the value of __BITS__. The magic macro framework, however, provides a natural hook for a future plug-in infrastructure to hook into a scripting language. Signed-off-by: H. Peter Anvin <hpa@zytor.com> 2019-02-27 06:00:54 +08:00			`%define tonum(=x) x`

			`dd tonum(1+3)`
			`dd tonum(5*7)`
listing: add -L option for additional listing info Add an -L option for additional listing information. Currently supported is -Le, which emits each line after processing through the preprocessor, and -Lm, which displays each single-line macro defined or undefined. NASM doesn't preserve the names of unused arguments, nor does it have any technical reason to do so. Instead of adding complexity to save them, make unnamed parameters official by specifying an empty string in the argument list. This has the additional advantage that () is now simply considered a single empty argument, which means that NASM should now properly handle things like: %define myreg() eax mov edx,myreg() ... similar to how the C preprocessor allows an empty macro argument list which is distinct from a macro with no arguments whatsoever. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> 2019-08-09 23:06:39 +08:00
			`%define mixed(a,=b,c) (a + b)`
			`%define mixed2(a,=b,) (a + b)`
			`%define ALPHA (1 + 2)`
			`%define BETA (3 + 4)`
			`%define GAMMA (5 + 6)`

			`dd mixed(ALPHA, BETA, GAMMA)`
			`dd mixed2(ALPHA, BETA, GAMMA)`