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refactor GetStoreAddress

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This commit is contained in:
4am 2019-09-10 09:37:19 -04:00
parent 003b6ad6f0
commit a88f70f150
2 changed files with 44 additions and 34 deletions
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2
src/constants.a
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@ -9,7 +9,7 @@
; D000..E4E9 - persistent data structures (gGlobalPrefsStore, gGamesListStore)
; ...end of data and start of code are approximate, in between is unused...
; ...if they ever overlap, things will go boom...
; E9FF..FFF9 - main program code
; EA09..FFF9 - main program code
; FFFA..FFFF - NMI, reset, IRQ vectors
;
; LC RAM BANK 2

76
src/okvs.a
View File

@ -72,20 +72,20 @@
;------------------------------------------------------------------------------
okvs_init
+PARAMS_ON_STACK 2
jsr SetPTRFromStackParams
ldy #0
jsr GetStoreAddress
; PTR -> store
; Y = 0
tya
sta (PTR),y ; set number of keys
sta (PTR),y ; set number of keys in store to 0
iny ; set initial free space pointer
iny ; set next-free-space pointer to store + 3
ldx PTR+1
lda PTR
clc
adc #$03
bcc +
inx
+
sta (PTR),y
+ sta (PTR),y
iny
txa
sta (PTR),y
@ -103,9 +103,10 @@ okvs_init
;------------------------------------------------------------------------------
okvs_len
+PARAMS_ON_STACK 2
jsr SetPTRFromStackParams
ldy #0
lda (PTR),y
jsr GetStoreAddress
; PTR -> store
; Y = 0
lda (PTR),y ; A = number of keys in store
rts
;------------------------------------------------------------------------------
@ -124,14 +125,15 @@ okvs_len
;------------------------------------------------------------------------------
okvs_append
+PARAMS_ON_STACK 7
jsr SetPTRFromStackParams
ldy #0
lda (PTR),y
jsr GetStoreAddress
; PTR -> store
; Y = 0
lda (PTR),y ; A = number of keys in store
clc
adc #1
sta (PTR),y ; increment number of keys
iny
lda (PTR),y
lda (PTR),y ; get address of next free space
pha
iny
lda (PTR),y
@ -200,10 +202,11 @@ okvs_append
iny
lda SRC+1
sta (PTR),y
jsr SetPTRFromStackParams ; update next-free-space pointer in head of okvs
jsr GetStoreAddress
; PTR -> store
ldy #1
lda SRC
sta (PTR),y
sta (PTR),y ; update next-free-space pointer in head
iny
lda SRC+1
sta (PTR),y
@ -226,11 +229,12 @@ okvs_append
;------------------------------------------------------------------------------
okvs_get
+PARAMS_ON_STACK 4
jsr SetPTRFromStackParams
ldy #0
lda (PTR),y
jsr GetStoreAddress
; PTR -> store
; Y = 0
lda (PTR),y ; A = number of keys in store
beq @fail ; no keys, fail immediately
sta @maxkeys ; A = number of keys
sta @maxkeys
jsr incptr3
; PTR -> first record
ldx #0
@ -293,7 +297,8 @@ okvs_get
;------------------------------------------------------------------------------
okvs_nth
+PARAMS_ON_STACK 3
jsr SetPTRFromStackParams
jsr GetStoreAddress
; PTR -> store
jsr incptr3
; PTR -> first record
ldy #3
@ -366,15 +371,16 @@ okvs_update
; $00/$01 clobbered
;------------------------------------------------------------------------------
okvs_iter
lda #$D0
lda #$D0 ; 'BNE' opcode
+HIDE_NEXT_2_BYTES
okvs_iter_values
lda #$24
lda #$24 ; 'BIT' opcode
sta @branch
+PARAMS_ON_STACK 4
jsr SetPTRFromStackParams
ldy #0
lda (PTR),y
jsr GetStoreAddress
; PTR -> store
; Y = 0
lda (PTR),y ; A = number of keys in store
beq @exit ; no keys, exit immediately
sta @max
+LDPARAM 3
@ -383,8 +389,9 @@ okvs_iter_values
; PTR -> first record
ldx #0
@loop
lda #2
@branch bne + ; SMC
lda #2 ; for iter, skip length = 2
@branch bne + ; SMC (iter_values puts a BIT here, so no branch)
; for iter_values, skip length = length(key) + 2 + 1
ldy #2
lda (PTR),y ; A = length of key
clc
@ -432,7 +439,9 @@ incptr
inc PTR+1
+ rts
SetPTRFromStackParams
GetStoreAddress
; in: PARAM = address of stack params (any PARAMS_ON_STACK macro will do this)
; out: PTR = address of store (always the first parameter on stack)
; preserves X
ldy #1
lda (PARAM),y
@ -442,13 +451,14 @@ SetPTRFromStackParams
sta PTR+1 ; PTR -> first parameter on stack
; execution falls through here
derefptr
; preserves X
ldy #0
; out: Y = 0
; preserves X
ldy #1
lda (PTR),y
pha
iny
dey
lda (PTR),y
sta PTR+1
pla
sta PTR
pla
sta PTR+1
rts