clearer description of memory()

This commit is contained in:
Irmen de Jong 2021-01-13 22:32:17 +01:00
parent 79e6d4b8dd
commit b128b79132
4 changed files with 19 additions and 38 deletions

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@ -334,7 +334,7 @@ _done
return
}
; TODO rewrite the rest in optimized assembly
; TODO rewrite the rest in optimized assembly (or reuse GRAPH_draw_line if we can get the FB replacement vector layer working)
word @zp d = 0
ubyte positive_ix = true
if dx < 0 {

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@ -840,12 +840,15 @@ swap(x, y)
Swap the values of numerical variables (or memory locations) x and y in a fast way.
memory(name, size)
Statically allocates a fixed portion of memory of the given size in bytes, and returns its address.
Slabs are considered identical if their name and size are the same.
This can be used to allocate parts of the memory where a normal byte array would
not suffice for instance if you need more than 256 bytes, and/or don't want to work
with fixed memory addresses for buffers.
The portion of memory cannot be used as an array, you only have the address of the first byte.
Returns the address of the first location of a statically "reserved" block of memory of the given size in bytes,
with the given name. Requesting the address of such a named memory block again later with
the same name, will result in the same address as before.
When reusing blocks in that way, it is required that the size argument is the same,
otherwise you'll get a compilation error.
This routine can be used to "reserve" parts of the memory where a normal byte array variable would
not suffice; for instance if you need more than 256 consecutive bytes.
The return value is just a simple uword address so it cannot be used as an array in your program.
You can only treat it as a pointer or use it in inline assembly.
Library routines

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@ -2,7 +2,6 @@
TODO
====
- (github issue:) replace memory() function by some sort of declaration?
- use (zp) addressing mode on 65c02 specific code rather than ldy#0 / lda (zp),y
- optimize pointer access code @(pointer)? use a subroutine? macro? 65c02 vs 6502?
- can we get rid of the --longOptionName command line options and only keep the short versions? https://github.com/Kotlin/kotlinx-cli/issues/50

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@ -1,41 +1,20 @@
%import test_stack
%import textio
%import diskio
%import string
%zeropage basicsafe
%option no_sysinit
main {
sub start() {
ubyte[40] input_line
if diskio.f_open(8, "romdis.asm") {
uword line=0
repeat 5 {
ubyte length = diskio.f_readline(input_line)
if length {
line++
txt.print_uw(line)
txt.chrout(':')
txt.print_ub(length)
txt.print(":[")
ubyte xx
for xx in 0 to length-1 {
txt.print_ubhex(input_line[xx], 1)
txt.chrout(' ')
}
; txt.print(&input_line)
txt.print("]\n")
; textparse.process_line()
if c64.READST() ; TODO also check STOP key
break
} else
break
}
diskio.f_close()
}
txt.print_uwhex(memory("a", 100), 1)
txt.nl()
txt.print_uwhex(memory("a", 200), 1)
txt.nl()
txt.print_uwhex(memory("a", 200), 1)
txt.nl()
txt.print_uwhex(memory("b", 200), 1)
txt.nl()
}
}