By "loop macro" do you mean you are using a .repeat? You could try recursion instead, since the .repeat is basically a form of recursion. Maybe give a more defined example.blargg wrote:And next, how to define a global symbol within a scope...The context is using scopes in a nice loop macro
Code: Select all
hex 01 03 a0 ba 23 43 fe ee fc 01 03 a0 ba 23 43 fe ee fc
Code: Select all
macro hex data
.ifblank data
.error "Please provide some data!"
.endif
.byte $.left(1,data)
.if .tcount(data) > 1
hex .mid(1, .tcount(data) - 1, data)
.endif
.endmacro
Code: Select all
macro hex data
.ifblank data
.error "Please provide some data!"
.endif
.repeat .tcount(data), I
.byte $.mid(I, 1, data)
.endrepeat
.endmacro
Unless you have to recompile ca65 for a greater recursion depth. A lot of interpreters* cap the call stack depth to prevent runaway recursion from making your machine unresponsive from swapping. Good luck getting a recursive macro to run 32768 deep, once for each byte in a bank.Movax12 wrote:Yes, I'm sure the recursive example will use more memory vs .repeat, but it shouldn't matter much on a modern PC.
Code: Select all
.macro recursefromhell i
.if i > 0
.local i1
i1 = i
.byte <i1
recursefromhell (i1 - 1)
.endif
.endmacro
; this works
recursefromhell 255
; this raises Error: Too many nested macro expansions
recursefromhell 256
What does this necessarily provide over .local once and then .set within the .repeat loop?The benefit being recursive example will allow you to have .local constants defined that are unique for each recursive expansion and hopefully avoid using any unnamed scopes (and making a global definition no problem).
No, just the equivalent of a for loop with braces for scope, that allows nesting, and doesn't require you to name each loop. I'm writing a CPU instruction tester and want to make several nested for loops to go over arrays of bytes.Movax12 wrote:By "loop macro" do you mean you are using a .repeat? You could try recursion instead, since the .repeat is basically a form of recursion. Maybe give a more defined example.blargg wrote:And next, how to define a global symbol within a scope...The context is using scopes in a nice loop macro
Code: Select all
loop_bytes { 0, 1, $7f, $80, $ff }, in_a
loop_bytes { 0, 1, $7f, $80, $ff }, operand
cmp operand
; A operand
; 00 00
; 00 01
; 00 7f
; 00 80
; 00 ff
; 01 00
; 01 01
; ...
loop_end
loop_end
I found it helpful in the instances where the recursive expansion would end and the .local would retain the value from before the expansion call. Not sure if I could come up with a good example vs .repeattepples wrote: What does this necessarily provide over .local once and then .set within the .repeat loop?